Upgrade V8 to 5.1.281.57  DO NOT MERGE

FPIIM-449

Change-Id: Id981b686b4d587ac31697662eb98bb34be42ad90
(cherry picked from commit 3b9bc31999c9787eb726ecdbfd5796bfdec32a18)
diff --git a/test/unittests/compiler/graph-unittest.h b/test/unittests/compiler/graph-unittest.h
index 9c99992..31bae6d 100644
--- a/test/unittests/compiler/graph-unittest.h
+++ b/test/unittests/compiler/graph-unittest.h
@@ -29,7 +29,6 @@
   explicit GraphTest(int num_parameters = 1);
   ~GraphTest() override;
 
- protected:
   Node* start() { return graph()->start(); }
   Node* end() { return graph()->end(); }
 
diff --git a/test/unittests/compiler/int64-lowering-unittest.cc b/test/unittests/compiler/int64-lowering-unittest.cc
index eff6d4a..08f3038 100644
--- a/test/unittests/compiler/int64-lowering-unittest.cc
+++ b/test/unittests/compiler/int64-lowering-unittest.cc
@@ -28,7 +28,10 @@
 
 class Int64LoweringTest : public GraphTest {
  public:
-  Int64LoweringTest() : GraphTest(), machine_(zone()) {
+  Int64LoweringTest()
+      : GraphTest(),
+        machine_(zone(), MachineRepresentation::kWord32,
+                 MachineOperatorBuilder::Flag::kAllOptionalOps) {
     value_[0] = 0x1234567890abcdef;
     value_[1] = 0x1edcba098765432f;
     value_[2] = 0x1133557799886644;
@@ -86,14 +89,34 @@
     return static_cast<int32_t>(value_[i] >> 32);
   }
 
+  void TestComparison(
+      const Operator* op,
+      Matcher<Node*> (*high_word_matcher)(const Matcher<Node*>& lhs_matcher,
+                                          const Matcher<Node*>& rhs_matcher),
+      Matcher<Node*> (*low_word_matcher)(const Matcher<Node*>& lhs_matcher,
+                                         const Matcher<Node*>& rhs_matcher)) {
+    LowerGraph(
+        graph()->NewNode(op, Int64Constant(value(0)), Int64Constant(value(1))),
+        MachineRepresentation::kWord32);
+    EXPECT_THAT(
+        graph()->end()->InputAt(1),
+        IsReturn(IsWord32Or(
+                     high_word_matcher(IsInt32Constant(high_word_value(0)),
+                                       IsInt32Constant(high_word_value(1))),
+                     IsWord32And(
+                         IsWord32Equal(IsInt32Constant(high_word_value(0)),
+                                       IsInt32Constant(high_word_value(1))),
+                         low_word_matcher(IsInt32Constant(low_word_value(0)),
+                                          IsInt32Constant(low_word_value(1))))),
+                 start(), start()));
+  }
+
  private:
   MachineOperatorBuilder machine_;
   int64_t value_[3];
 };
 
 TEST_F(Int64LoweringTest, Int64Constant) {
-  if (4 != kPointerSize) return;
-
   LowerGraph(Int64Constant(value(0)), MachineRepresentation::kWord64);
   EXPECT_THAT(graph()->end()->InputAt(1),
               IsReturn2(IsInt32Constant(low_word_value(0)),
@@ -101,8 +124,6 @@
 }
 
 TEST_F(Int64LoweringTest, Int64Load) {
-  if (4 != kPointerSize) return;
-
   int32_t base = 0x1234;
   int32_t index = 0x5678;
 
@@ -128,8 +149,6 @@
 }
 
 TEST_F(Int64LoweringTest, Int64Store) {
-  if (4 != kPointerSize) return;
-
   // We have to build the TF graph explicitly here because Store does not return
   // a value.
 
@@ -173,8 +192,6 @@
 }
 
 TEST_F(Int64LoweringTest, Int64And) {
-  if (4 != kPointerSize) return;
-
   LowerGraph(graph()->NewNode(machine()->Word64And(), Int64Constant(value(0)),
                               Int64Constant(value(1))),
              MachineRepresentation::kWord64);
@@ -187,8 +204,6 @@
 }
 
 TEST_F(Int64LoweringTest, TruncateInt64ToInt32) {
-  if (4 != kPointerSize) return;
-
   LowerGraph(graph()->NewNode(machine()->TruncateInt64ToInt32(),
                               Int64Constant(value(0))),
              MachineRepresentation::kWord32);
@@ -197,8 +212,6 @@
 }
 
 TEST_F(Int64LoweringTest, Parameter) {
-  if (4 != kPointerSize) return;
-
   LowerGraph(Parameter(0), MachineRepresentation::kWord64,
              MachineRepresentation::kWord64, 1);
 
@@ -207,8 +220,6 @@
 }
 
 TEST_F(Int64LoweringTest, Parameter2) {
-  if (4 != kPointerSize) return;
-
   Signature<MachineRepresentation>::Builder sig_builder(zone(), 1, 5);
   sig_builder.AddReturn(MachineRepresentation::kWord32);
 
@@ -229,8 +240,6 @@
 }
 
 TEST_F(Int64LoweringTest, CallI64Return) {
-  if (4 != kPointerSize) return;
-
   int32_t function = 0x9999;
 
   Signature<MachineRepresentation>::Builder sig_builder(zone(), 1, 0);
@@ -259,8 +268,6 @@
 }
 
 TEST_F(Int64LoweringTest, CallI64Parameter) {
-  if (4 != kPointerSize) return;
-
   int32_t function = 0x9999;
 
   Signature<MachineRepresentation>::Builder sig_builder(zone(), 1, 3);
@@ -294,6 +301,505 @@
       wasm::ModuleEnv::GetI32WasmCallDescriptor(zone(), desc));
 }
 
+// todo(ahaas): I added a list of missing instructions here to make merging
+// easier when I do them one by one.
+// kExprI64Add:
+TEST_F(Int64LoweringTest, Int64Add) {
+  LowerGraph(graph()->NewNode(machine()->Int64Add(), Int64Constant(value(0)),
+                              Int64Constant(value(1))),
+             MachineRepresentation::kWord64);
+
+  Capture<Node*> add;
+  Matcher<Node*> add_matcher = IsInt32PairAdd(
+      IsInt32Constant(low_word_value(0)), IsInt32Constant(high_word_value(0)),
+      IsInt32Constant(low_word_value(1)), IsInt32Constant(high_word_value(1)));
+
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsProjection(0, AllOf(CaptureEq(&add), add_matcher)),
+                        IsProjection(1, AllOf(CaptureEq(&add), add_matcher)),
+                        start(), start()));
+}
+// kExprI64Sub:
+TEST_F(Int64LoweringTest, Int64Sub) {
+  LowerGraph(graph()->NewNode(machine()->Int64Sub(), Int64Constant(value(0)),
+                              Int64Constant(value(1))),
+             MachineRepresentation::kWord64);
+
+  Capture<Node*> sub;
+  Matcher<Node*> sub_matcher = IsInt32PairSub(
+      IsInt32Constant(low_word_value(0)), IsInt32Constant(high_word_value(0)),
+      IsInt32Constant(low_word_value(1)), IsInt32Constant(high_word_value(1)));
+
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsProjection(0, AllOf(CaptureEq(&sub), sub_matcher)),
+                        IsProjection(1, AllOf(CaptureEq(&sub), sub_matcher)),
+                        start(), start()));
+}
+
+// kExprI64Mul:
+TEST_F(Int64LoweringTest, Int64Mul) {
+  LowerGraph(graph()->NewNode(machine()->Int64Mul(), Int64Constant(value(0)),
+                              Int64Constant(value(1))),
+             MachineRepresentation::kWord64);
+
+  Capture<Node*> mul_capture;
+  Matcher<Node*> mul_matcher = IsInt32PairMul(
+      IsInt32Constant(low_word_value(0)), IsInt32Constant(high_word_value(0)),
+      IsInt32Constant(low_word_value(1)), IsInt32Constant(high_word_value(1)));
+
+  EXPECT_THAT(
+      graph()->end()->InputAt(1),
+      IsReturn2(IsProjection(0, AllOf(CaptureEq(&mul_capture), mul_matcher)),
+                IsProjection(1, AllOf(CaptureEq(&mul_capture), mul_matcher)),
+                start(), start()));
+}
+
+// kExprI64DivS:
+// kExprI64DivU:
+// kExprI64RemS:
+// kExprI64RemU:
+// kExprI64Ior:
+TEST_F(Int64LoweringTest, Int64Ior) {
+  LowerGraph(graph()->NewNode(machine()->Word64Or(), Int64Constant(value(0)),
+                              Int64Constant(value(1))),
+             MachineRepresentation::kWord64);
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsWord32Or(IsInt32Constant(low_word_value(0)),
+                                   IsInt32Constant(low_word_value(1))),
+                        IsWord32Or(IsInt32Constant(high_word_value(0)),
+                                   IsInt32Constant(high_word_value(1))),
+                        start(), start()));
+}
+
+// kExprI64Xor:
+TEST_F(Int64LoweringTest, Int64Xor) {
+  LowerGraph(graph()->NewNode(machine()->Word64Xor(), Int64Constant(value(0)),
+                              Int64Constant(value(1))),
+             MachineRepresentation::kWord64);
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsWord32Xor(IsInt32Constant(low_word_value(0)),
+                                    IsInt32Constant(low_word_value(1))),
+                        IsWord32Xor(IsInt32Constant(high_word_value(0)),
+                                    IsInt32Constant(high_word_value(1))),
+                        start(), start()));
+}
+// kExprI64Shl:
+TEST_F(Int64LoweringTest, Int64Shl) {
+  LowerGraph(graph()->NewNode(machine()->Word64Shl(), Int64Constant(value(0)),
+                              Int64Constant(value(1))),
+             MachineRepresentation::kWord64);
+
+  Capture<Node*> shl;
+  Matcher<Node*> shl_matcher = IsWord32PairShl(
+      IsInt32Constant(low_word_value(0)), IsInt32Constant(high_word_value(0)),
+      IsInt32Constant(low_word_value(1)));
+
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsProjection(0, AllOf(CaptureEq(&shl), shl_matcher)),
+                        IsProjection(1, AllOf(CaptureEq(&shl), shl_matcher)),
+                        start(), start()));
+}
+// kExprI64ShrU:
+TEST_F(Int64LoweringTest, Int64ShrU) {
+  LowerGraph(graph()->NewNode(machine()->Word64Shr(), Int64Constant(value(0)),
+                              Int64Constant(value(1))),
+             MachineRepresentation::kWord64);
+
+  Capture<Node*> shr;
+  Matcher<Node*> shr_matcher = IsWord32PairShr(
+      IsInt32Constant(low_word_value(0)), IsInt32Constant(high_word_value(0)),
+      IsInt32Constant(low_word_value(1)));
+
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsProjection(0, AllOf(CaptureEq(&shr), shr_matcher)),
+                        IsProjection(1, AllOf(CaptureEq(&shr), shr_matcher)),
+                        start(), start()));
+}
+// kExprI64ShrS:
+TEST_F(Int64LoweringTest, Int64ShrS) {
+  LowerGraph(graph()->NewNode(machine()->Word64Sar(), Int64Constant(value(0)),
+                              Int64Constant(value(1))),
+             MachineRepresentation::kWord64);
+
+  Capture<Node*> sar;
+  Matcher<Node*> sar_matcher = IsWord32PairSar(
+      IsInt32Constant(low_word_value(0)), IsInt32Constant(high_word_value(0)),
+      IsInt32Constant(low_word_value(1)));
+
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsProjection(0, AllOf(CaptureEq(&sar), sar_matcher)),
+                        IsProjection(1, AllOf(CaptureEq(&sar), sar_matcher)),
+                        start(), start()));
+}
+// kExprI64Eq:
+TEST_F(Int64LoweringTest, Int64Eq) {
+  LowerGraph(graph()->NewNode(machine()->Word64Equal(), Int64Constant(value(0)),
+                              Int64Constant(value(1))),
+             MachineRepresentation::kWord32);
+  EXPECT_THAT(
+      graph()->end()->InputAt(1),
+      IsReturn(IsWord32Equal(
+                   IsWord32Or(IsWord32Xor(IsInt32Constant(low_word_value(0)),
+                                          IsInt32Constant(low_word_value(1))),
+                              IsWord32Xor(IsInt32Constant(high_word_value(0)),
+                                          IsInt32Constant(high_word_value(1)))),
+                   IsInt32Constant(0)),
+               start(), start()));
+}
+
+// kExprI64LtS:
+TEST_F(Int64LoweringTest, Int64LtS) {
+  TestComparison(machine()->Int64LessThan(), IsInt32LessThan, IsUint32LessThan);
+}
+// kExprI64LeS:
+TEST_F(Int64LoweringTest, Int64LeS) {
+  TestComparison(machine()->Int64LessThanOrEqual(), IsInt32LessThan,
+                 IsUint32LessThanOrEqual);
+}
+// kExprI64LtU:
+TEST_F(Int64LoweringTest, Int64LtU) {
+  TestComparison(machine()->Uint64LessThan(), IsUint32LessThan,
+                 IsUint32LessThan);
+}
+// kExprI64LeU:
+TEST_F(Int64LoweringTest, Int64LeU) {
+  TestComparison(machine()->Uint64LessThanOrEqual(), IsUint32LessThan,
+                 IsUint32LessThanOrEqual);
+}
+
+// kExprI32ConvertI64:
+TEST_F(Int64LoweringTest, I32ConvertI64) {
+  LowerGraph(graph()->NewNode(machine()->TruncateInt64ToInt32(),
+                              Int64Constant(value(0))),
+             MachineRepresentation::kWord32);
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn(IsInt32Constant(low_word_value(0)), start(), start()));
+}
+// kExprI64SConvertI32:
+TEST_F(Int64LoweringTest, I64SConvertI32) {
+  LowerGraph(graph()->NewNode(machine()->ChangeInt32ToInt64(),
+                              Int32Constant(low_word_value(0))),
+             MachineRepresentation::kWord64);
+
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsInt32Constant(low_word_value(0)),
+                        IsWord32Sar(IsInt32Constant(low_word_value(0)),
+                                    IsInt32Constant(31)),
+                        start(), start()));
+}
+
+TEST_F(Int64LoweringTest, I64SConvertI32_2) {
+  LowerGraph(
+      graph()->NewNode(machine()->ChangeInt32ToInt64(),
+                       graph()->NewNode(machine()->TruncateInt64ToInt32(),
+                                        Int64Constant(value(0)))),
+      MachineRepresentation::kWord64);
+
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsInt32Constant(low_word_value(0)),
+                        IsWord32Sar(IsInt32Constant(low_word_value(0)),
+                                    IsInt32Constant(31)),
+                        start(), start()));
+}
+// kExprI64UConvertI32:
+TEST_F(Int64LoweringTest, I64UConvertI32) {
+  LowerGraph(graph()->NewNode(machine()->ChangeUint32ToUint64(),
+                              Int32Constant(low_word_value(0))),
+             MachineRepresentation::kWord64);
+
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsInt32Constant(low_word_value(0)), IsInt32Constant(0),
+                        start(), start()));
+}
+
+TEST_F(Int64LoweringTest, I64UConvertI32_2) {
+  LowerGraph(
+      graph()->NewNode(machine()->ChangeUint32ToUint64(),
+                       graph()->NewNode(machine()->TruncateInt64ToInt32(),
+                                        Int64Constant(value(0)))),
+      MachineRepresentation::kWord64);
+
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsInt32Constant(low_word_value(0)), IsInt32Constant(0),
+                        start(), start()));
+}
+// kExprF64ReinterpretI64:
+TEST_F(Int64LoweringTest, F64ReinterpretI64) {
+  LowerGraph(graph()->NewNode(machine()->BitcastInt64ToFloat64(),
+                              Int64Constant(value(0))),
+             MachineRepresentation::kFloat64);
+
+  Capture<Node*> stack_slot_capture;
+  Matcher<Node*> stack_slot_matcher =
+      IsStackSlot(MachineRepresentation::kWord64);
+
+  Capture<Node*> store_capture;
+  Matcher<Node*> store_matcher =
+      IsStore(StoreRepresentation(MachineRepresentation::kWord32,
+                                  WriteBarrierKind::kNoWriteBarrier),
+              AllOf(CaptureEq(&stack_slot_capture), stack_slot_matcher),
+              IsInt32Constant(0), IsInt32Constant(low_word_value(0)),
+              IsStore(StoreRepresentation(MachineRepresentation::kWord32,
+                                          WriteBarrierKind::kNoWriteBarrier),
+                      AllOf(CaptureEq(&stack_slot_capture), stack_slot_matcher),
+                      IsInt32Constant(4), IsInt32Constant(high_word_value(0)),
+                      start(), start()),
+              start());
+
+  EXPECT_THAT(
+      graph()->end()->InputAt(1),
+      IsReturn(IsLoad(MachineType::Float64(),
+                      AllOf(CaptureEq(&stack_slot_capture), stack_slot_matcher),
+                      IsInt32Constant(0),
+                      AllOf(CaptureEq(&store_capture), store_matcher), start()),
+               start(), start()));
+}
+// kExprI64ReinterpretF64:
+TEST_F(Int64LoweringTest, I64ReinterpretF64) {
+  LowerGraph(graph()->NewNode(machine()->BitcastFloat64ToInt64(),
+                              Float64Constant(bit_cast<double>(value(0)))),
+             MachineRepresentation::kWord64);
+
+  Capture<Node*> stack_slot;
+  Matcher<Node*> stack_slot_matcher =
+      IsStackSlot(MachineRepresentation::kWord64);
+
+  Capture<Node*> store;
+  Matcher<Node*> store_matcher = IsStore(
+      StoreRepresentation(MachineRepresentation::kFloat64,
+                          WriteBarrierKind::kNoWriteBarrier),
+      AllOf(CaptureEq(&stack_slot), stack_slot_matcher), IsInt32Constant(0),
+      IsFloat64Constant(bit_cast<double>(value(0))), start(), start());
+
+  EXPECT_THAT(
+      graph()->end()->InputAt(1),
+      IsReturn2(IsLoad(MachineType::Int32(),
+                       AllOf(CaptureEq(&stack_slot), stack_slot_matcher),
+                       IsInt32Constant(0),
+                       AllOf(CaptureEq(&store), store_matcher), start()),
+                IsLoad(MachineType::Int32(),
+                       AllOf(CaptureEq(&stack_slot), stack_slot_matcher),
+                       IsInt32Constant(0x4),
+                       AllOf(CaptureEq(&store), store_matcher), start()),
+                start(), start()));
+}
+// kExprI64Clz:
+TEST_F(Int64LoweringTest, I64Clz) {
+  LowerGraph(graph()->NewNode(machine()->Word64Clz(), Int64Constant(value(0))),
+             MachineRepresentation::kWord64);
+
+  Capture<Node*> branch_capture;
+  Matcher<Node*> branch_matcher = IsBranch(
+      IsWord32Equal(IsInt32Constant(high_word_value(0)), IsInt32Constant(0)),
+      start());
+
+  EXPECT_THAT(
+      graph()->end()->InputAt(1),
+      IsReturn2(
+          IsPhi(MachineRepresentation::kWord32,
+                IsInt32Add(IsWord32Clz(IsInt32Constant(low_word_value(0))),
+                           IsInt32Constant(32)),
+                IsWord32Clz(IsInt32Constant(high_word_value(0))),
+                IsMerge(
+                    IsIfTrue(AllOf(CaptureEq(&branch_capture), branch_matcher)),
+                    IsIfFalse(
+                        AllOf(CaptureEq(&branch_capture), branch_matcher)))),
+          IsInt32Constant(0), start(), start()));
+}
+// kExprI64Ctz:
+TEST_F(Int64LoweringTest, I64Ctz) {
+  LowerGraph(graph()->NewNode(machine()->Word64CtzPlaceholder(),
+                              Int64Constant(value(0))),
+             MachineRepresentation::kWord64);
+  Capture<Node*> branch_capture;
+  Matcher<Node*> branch_matcher = IsBranch(
+      IsWord32Equal(IsInt32Constant(low_word_value(0)), IsInt32Constant(0)),
+      start());
+  EXPECT_THAT(
+      graph()->end()->InputAt(1),
+      IsReturn2(
+          IsPhi(MachineRepresentation::kWord32,
+                IsInt32Add(IsWord32Ctz(IsInt32Constant(high_word_value(0))),
+                           IsInt32Constant(32)),
+                IsWord32Ctz(IsInt32Constant(low_word_value(0))),
+                IsMerge(
+                    IsIfTrue(AllOf(CaptureEq(&branch_capture), branch_matcher)),
+                    IsIfFalse(
+                        AllOf(CaptureEq(&branch_capture), branch_matcher)))),
+          IsInt32Constant(0), start(), start()));
+}
+// kExprI64Popcnt:
+
+TEST_F(Int64LoweringTest, Dfs) {
+  Node* common = Int64Constant(value(0));
+  LowerGraph(graph()->NewNode(machine()->Word64And(), common,
+                              graph()->NewNode(machine()->Word64And(), common,
+                                               Int64Constant(value(1)))),
+             MachineRepresentation::kWord64);
+
+  EXPECT_THAT(
+      graph()->end()->InputAt(1),
+      IsReturn2(IsWord32And(IsInt32Constant(low_word_value(0)),
+                            IsWord32And(IsInt32Constant(low_word_value(0)),
+                                        IsInt32Constant(low_word_value(1)))),
+                IsWord32And(IsInt32Constant(high_word_value(0)),
+                            IsWord32And(IsInt32Constant(high_word_value(0)),
+                                        IsInt32Constant(high_word_value(1)))),
+                start(), start()));
+}
+
+TEST_F(Int64LoweringTest, I64Popcnt) {
+  LowerGraph(graph()->NewNode(machine()->Word64PopcntPlaceholder(),
+                              Int64Constant(value(0))),
+             MachineRepresentation::kWord64);
+
+  EXPECT_THAT(
+      graph()->end()->InputAt(1),
+      IsReturn2(IsInt32Add(IsWord32Popcnt(IsInt32Constant(low_word_value(0))),
+                           IsWord32Popcnt(IsInt32Constant(high_word_value(0)))),
+                IsInt32Constant(0), start(), start()));
+}
+
+TEST_F(Int64LoweringTest, I64Ror) {
+  LowerGraph(graph()->NewNode(machine()->Word64Ror(), Int64Constant(value(0)),
+                              Parameter(0)),
+             MachineRepresentation::kWord64, MachineRepresentation::kWord64, 1);
+
+  Matcher<Node*> branch_lt32_matcher =
+      IsBranch(IsInt32LessThan(IsParameter(0), IsInt32Constant(32)), start());
+
+  Matcher<Node*> low_input_matcher = IsPhi(
+      MachineRepresentation::kWord32, IsInt32Constant(low_word_value(0)),
+      IsInt32Constant(high_word_value(0)),
+      IsMerge(IsIfTrue(branch_lt32_matcher), IsIfFalse(branch_lt32_matcher)));
+
+  Matcher<Node*> high_input_matcher = IsPhi(
+      MachineRepresentation::kWord32, IsInt32Constant(high_word_value(0)),
+      IsInt32Constant(low_word_value(0)),
+      IsMerge(IsIfTrue(branch_lt32_matcher), IsIfFalse(branch_lt32_matcher)));
+
+  Matcher<Node*> shift_matcher =
+      IsWord32And(IsParameter(0), IsInt32Constant(0x1f));
+
+  Matcher<Node*> bit_mask_matcher = IsWord32Shl(
+      IsWord32Sar(IsInt32Constant(std::numeric_limits<int32_t>::min()),
+                  shift_matcher),
+      IsInt32Constant(1));
+
+  Matcher<Node*> inv_mask_matcher =
+      IsWord32Xor(bit_mask_matcher, IsInt32Constant(-1));
+
+  EXPECT_THAT(
+      graph()->end()->InputAt(1),
+      IsReturn2(
+          IsWord32Or(IsWord32And(IsWord32Ror(low_input_matcher, shift_matcher),
+                                 inv_mask_matcher),
+                     IsWord32And(IsWord32Ror(high_input_matcher, shift_matcher),
+                                 bit_mask_matcher)),
+          IsWord32Or(IsWord32And(IsWord32Ror(high_input_matcher, shift_matcher),
+                                 inv_mask_matcher),
+                     IsWord32And(IsWord32Ror(low_input_matcher, shift_matcher),
+                                 bit_mask_matcher)),
+          start(), start()));
+}
+
+TEST_F(Int64LoweringTest, I64Ror_0) {
+  LowerGraph(graph()->NewNode(machine()->Word64Ror(), Int64Constant(value(0)),
+                              Int32Constant(0)),
+             MachineRepresentation::kWord64);
+
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsInt32Constant(low_word_value(0)),
+                        IsInt32Constant(high_word_value(0)), start(), start()));
+}
+
+TEST_F(Int64LoweringTest, I64Ror_32) {
+  LowerGraph(graph()->NewNode(machine()->Word64Ror(), Int64Constant(value(0)),
+                              Int32Constant(32)),
+             MachineRepresentation::kWord64);
+
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsInt32Constant(high_word_value(0)),
+                        IsInt32Constant(low_word_value(0)), start(), start()));
+}
+
+TEST_F(Int64LoweringTest, I64Ror_11) {
+  LowerGraph(graph()->NewNode(machine()->Word64Ror(), Int64Constant(value(0)),
+                              Int32Constant(11)),
+             MachineRepresentation::kWord64);
+
+  EXPECT_THAT(
+      graph()->end()->InputAt(1),
+      IsReturn2(IsWord32Or(IsWord32Shr(IsInt32Constant(low_word_value(0)),
+                                       IsInt32Constant(11)),
+                           IsWord32Shl(IsInt32Constant(high_word_value(0)),
+                                       IsInt32Constant(21))),
+                IsWord32Or(IsWord32Shr(IsInt32Constant(high_word_value(0)),
+                                       IsInt32Constant(11)),
+                           IsWord32Shl(IsInt32Constant(low_word_value(0)),
+                                       IsInt32Constant(21))),
+                start(), start()));
+}
+
+TEST_F(Int64LoweringTest, I64Ror_43) {
+  LowerGraph(graph()->NewNode(machine()->Word64Ror(), Int64Constant(value(0)),
+                              Int32Constant(43)),
+             MachineRepresentation::kWord64);
+
+  EXPECT_THAT(
+      graph()->end()->InputAt(1),
+      IsReturn2(IsWord32Or(IsWord32Shr(IsInt32Constant(high_word_value(0)),
+                                       IsInt32Constant(11)),
+                           IsWord32Shl(IsInt32Constant(low_word_value(0)),
+                                       IsInt32Constant(21))),
+                IsWord32Or(IsWord32Shr(IsInt32Constant(low_word_value(0)),
+                                       IsInt32Constant(11)),
+                           IsWord32Shl(IsInt32Constant(high_word_value(0)),
+                                       IsInt32Constant(21))),
+                start(), start()));
+}
+
+TEST_F(Int64LoweringTest, I64PhiWord64) {
+  LowerGraph(graph()->NewNode(common()->Phi(MachineRepresentation::kWord64, 2),
+                              Int64Constant(value(0)), Int64Constant(value(1)),
+                              start()),
+             MachineRepresentation::kWord64);
+
+  EXPECT_THAT(graph()->end()->InputAt(1),
+              IsReturn2(IsPhi(MachineRepresentation::kWord32,
+                              IsInt32Constant(low_word_value(0)),
+                              IsInt32Constant(low_word_value(1)), start()),
+                        IsPhi(MachineRepresentation::kWord32,
+                              IsInt32Constant(high_word_value(0)),
+                              IsInt32Constant(high_word_value(1)), start()),
+                        start(), start()));
+}
+
+void TestPhi(Int64LoweringTest* test, MachineRepresentation rep, Node* v1,
+             Node* v2) {
+  test->LowerGraph(test->graph()->NewNode(test->common()->Phi(rep, 2), v1, v2,
+                                          test->start()),
+                   rep);
+
+  EXPECT_THAT(test->graph()->end()->InputAt(1),
+              IsReturn(IsPhi(rep, v1, v2, test->start()), test->start(),
+                       test->start()));
+}
+
+TEST_F(Int64LoweringTest, I64PhiFloat32) {
+  TestPhi(this, MachineRepresentation::kFloat32, Float32Constant(1.5),
+          Float32Constant(2.5));
+}
+
+TEST_F(Int64LoweringTest, I64PhiFloat64) {
+  TestPhi(this, MachineRepresentation::kFloat64, Float32Constant(1.5),
+          Float32Constant(2.5));
+}
+
+TEST_F(Int64LoweringTest, I64PhiWord32) {
+  TestPhi(this, MachineRepresentation::kWord32, Float32Constant(1),
+          Float32Constant(2));
+}
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
diff --git a/test/unittests/compiler/js-builtin-reducer-unittest.cc b/test/unittests/compiler/js-builtin-reducer-unittest.cc
index 9e14cda..0f8eed7 100644
--- a/test/unittests/compiler/js-builtin-reducer-unittest.cc
+++ b/test/unittests/compiler/js-builtin-reducer-unittest.cc
@@ -43,7 +43,7 @@
                               isolate()->factory()->NewStringFromAsciiChecked(
                                   "Math")).ToHandleChecked();
     Handle<JSFunction> f = Handle<JSFunction>::cast(
-        JSObject::GetProperty(
+        Object::GetProperty(
             m, isolate()->factory()->NewStringFromAsciiChecked(name))
             .ToHandleChecked());
     return HeapConstant(f);
@@ -149,8 +149,8 @@
   Node* control = graph()->start();
   Node* context = UndefinedConstant();
   Node* frame_state = graph()->start();
-  TRACED_FOREACH(Type*, t0, kIntegral32Types) {
-    TRACED_FOREACH(Type*, t1, kIntegral32Types) {
+  TRACED_FOREACH(Type*, t0, kNumberTypes) {
+    TRACED_FOREACH(Type*, t1, kNumberTypes) {
       Node* p0 = Parameter(t0, 0);
       Node* p1 = Parameter(t1, 1);
       Node* call = graph()->NewNode(javascript()->CallFunction(4), function,
@@ -159,7 +159,8 @@
       Reduction r = Reduce(call);
 
       ASSERT_TRUE(r.Changed());
-      EXPECT_THAT(r.replacement(), IsInt32Mul(p0, p1));
+      EXPECT_THAT(r.replacement(),
+                  IsNumberImul(IsNumberToUint32(p0), IsNumberToUint32(p1)));
     }
   }
 }
diff --git a/test/unittests/compiler/js-intrinsic-lowering-unittest.cc b/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
index 919c1b2..de0eefc 100644
--- a/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
+++ b/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
@@ -91,7 +91,8 @@
       graph()->NewNode(javascript()->CallRuntime(Runtime::kInlineDoubleLo, 1),
                        input, context, effect, control));
   ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(r.replacement(), IsFloat64ExtractLowWord32(input));
+  EXPECT_THAT(r.replacement(),
+              IsFloat64ExtractLowWord32(IsGuard(Type::Number(), input, _)));
 }
 
 
@@ -108,7 +109,8 @@
       graph()->NewNode(javascript()->CallRuntime(Runtime::kInlineDoubleHi, 1),
                        input, context, effect, control));
   ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(r.replacement(), IsFloat64ExtractHighWord32(input));
+  EXPECT_THAT(r.replacement(),
+              IsFloat64ExtractHighWord32(IsGuard(Type::Number(), input, _)));
 }
 
 
@@ -240,58 +242,6 @@
 
 
 // -----------------------------------------------------------------------------
-// %_MathFloor
-
-
-TEST_F(JSIntrinsicLoweringTest, InlineMathFloor) {
-  Node* const input = Parameter(0);
-  Node* const context = Parameter(1);
-  Node* const effect = graph()->start();
-  Node* const control = graph()->start();
-  Reduction const r = Reduce(
-      graph()->NewNode(javascript()->CallRuntime(Runtime::kInlineMathFloor, 1),
-                       input, context, effect, control),
-      MachineOperatorBuilder::kFloat64RoundDown);
-  ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(r.replacement(), IsFloat64RoundDown(input));
-}
-
-
-// -----------------------------------------------------------------------------
-// %_MathSqrt
-
-
-TEST_F(JSIntrinsicLoweringTest, InlineMathSqrt) {
-  Node* const input = Parameter(0);
-  Node* const context = Parameter(1);
-  Node* const effect = graph()->start();
-  Node* const control = graph()->start();
-  Reduction const r = Reduce(
-      graph()->NewNode(javascript()->CallRuntime(Runtime::kInlineMathSqrt, 1),
-                       input, context, effect, control));
-  ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(r.replacement(), IsFloat64Sqrt(input));
-}
-
-
-// -----------------------------------------------------------------------------
-// %_MathClz32
-
-
-TEST_F(JSIntrinsicLoweringTest, InlineMathClz32) {
-  Node* const input = Parameter(0);
-  Node* const context = Parameter(1);
-  Node* const effect = graph()->start();
-  Node* const control = graph()->start();
-  Reduction const r = Reduce(
-      graph()->NewNode(javascript()->CallRuntime(Runtime::kInlineMathClz32, 1),
-                       input, context, effect, control));
-  ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(r.replacement(), IsWord32Clz(input));
-}
-
-
-// -----------------------------------------------------------------------------
 // %_ValueOf
 
 
@@ -334,6 +284,23 @@
               AllOf(CaptureEq(&if_false0), IsIfFalse(CaptureEq(&branch0))))));
 }
 
+// -----------------------------------------------------------------------------
+// %_GetOrdinaryHasInstance
+
+TEST_F(JSIntrinsicLoweringTest, InlineGetOrdinaryHasInstance) {
+  Node* const context = Parameter(0);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction const r = Reduce(graph()->NewNode(
+      javascript()->CallRuntime(Runtime::kInlineGetOrdinaryHasInstance, 0),
+      context, effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(
+      r.replacement(),
+      IsLoadContext(
+          ContextAccess(0, Context::ORDINARY_HAS_INSTANCE_INDEX, true), _));
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
diff --git a/test/unittests/compiler/js-typed-lowering-unittest.cc b/test/unittests/compiler/js-typed-lowering-unittest.cc
index e37d4a2..1adb5da 100644
--- a/test/unittests/compiler/js-typed-lowering-unittest.cc
+++ b/test/unittests/compiler/js-typed-lowering-unittest.cc
@@ -67,7 +67,7 @@
 
 
 STATIC_ASSERT(LANGUAGE_END == 3);
-const LanguageMode kLanguageModes[] = {SLOPPY, STRICT, STRONG};
+const LanguageMode kLanguageModes[] = {SLOPPY, STRICT};
 
 }  // namespace
 
diff --git a/test/unittests/compiler/load-elimination-unittest.cc b/test/unittests/compiler/load-elimination-unittest.cc
index 3ad11cf..38bb151 100644
--- a/test/unittests/compiler/load-elimination-unittest.cc
+++ b/test/unittests/compiler/load-elimination-unittest.cc
@@ -12,30 +12,33 @@
 namespace internal {
 namespace compiler {
 
-class LoadEliminationTest : public GraphTest {
+class LoadEliminationTest : public TypedGraphTest {
  public:
-  LoadEliminationTest() : GraphTest(3), simplified_(zone()) {}
+  LoadEliminationTest()
+      : TypedGraphTest(3), common_(zone()), simplified_(zone()) {}
   ~LoadEliminationTest() override {}
 
  protected:
   Reduction Reduce(Node* node) {
     // TODO(titzer): mock the GraphReducer here for better unit testing.
     GraphReducer graph_reducer(zone(), graph());
-    LoadElimination reducer(&graph_reducer);
+    LoadElimination reducer(&graph_reducer, graph(), common());
     return reducer.Reduce(node);
   }
 
   SimplifiedOperatorBuilder* simplified() { return &simplified_; }
+  CommonOperatorBuilder* common() { return &common_; }
 
  private:
+  CommonOperatorBuilder common_;
   SimplifiedOperatorBuilder simplified_;
 };
 
 
 TEST_F(LoadEliminationTest, LoadFieldWithStoreField) {
-  Node* object1 = Parameter(0);
-  Node* object2 = Parameter(1);
-  Node* value = Parameter(2);
+  Node* object1 = Parameter(Type::Any(), 0);
+  Node* object2 = Parameter(Type::Any(), 1);
+  Node* value = Parameter(Type::Any(), 2);
   Node* effect = graph()->start();
   Node* control = graph()->start();
 
diff --git a/test/unittests/compiler/loop-peeling-unittest.cc b/test/unittests/compiler/loop-peeling-unittest.cc
index 9dcec85..9db4905 100644
--- a/test/unittests/compiler/loop-peeling-unittest.cc
+++ b/test/unittests/compiler/loop-peeling-unittest.cc
@@ -64,7 +64,7 @@
       OFStream os(stdout);
       os << AsRPO(*graph());
     }
-    Zone zone;
+    Zone zone(isolate()->allocator());
     return LoopFinder::BuildLoopTree(graph(), &zone);
   }
 
diff --git a/test/unittests/compiler/node-test-utils.cc b/test/unittests/compiler/node-test-utils.cc
index ee4cf54..6e5d39f 100644
--- a/test/unittests/compiler/node-test-utils.cc
+++ b/test/unittests/compiler/node-test-utils.cc
@@ -1330,6 +1330,53 @@
   const Matcher<Node*> control_matcher_;
 };
 
+class IsStackSlotMatcher final : public NodeMatcher {
+ public:
+  explicit IsStackSlotMatcher(const Matcher<MachineRepresentation>& rep_matcher)
+      : NodeMatcher(IrOpcode::kStackSlot), rep_matcher_(rep_matcher) {}
+
+  void DescribeTo(std::ostream* os) const final {
+    NodeMatcher::DescribeTo(os);
+    *os << " whose rep (";
+    rep_matcher_.DescribeTo(os);
+    *os << ")";
+  }
+
+  bool MatchAndExplain(Node* node, MatchResultListener* listener) const final {
+    return (NodeMatcher::MatchAndExplain(node, listener) &&
+            PrintMatchAndExplain(OpParameter<MachineRepresentation>(node),
+                                 "rep", rep_matcher_, listener));
+  }
+
+ private:
+  const Matcher<MachineRepresentation> rep_matcher_;
+};
+
+class IsGuardMatcher final : public NodeMatcher {
+ public:
+  IsGuardMatcher(const Matcher<Type*>& type_matcher,
+                 const Matcher<Node*>& value_matcher,
+                 const Matcher<Node*>& control_matcher)
+      : NodeMatcher(IrOpcode::kGuard),
+        type_matcher_(type_matcher),
+        value_matcher_(value_matcher),
+        control_matcher_(control_matcher) {}
+
+  bool MatchAndExplain(Node* node, MatchResultListener* listener) const final {
+    return (NodeMatcher::MatchAndExplain(node, listener) &&
+            PrintMatchAndExplain(OpParameter<Type*>(node->op()), "type",
+                                 type_matcher_, listener) &&
+            PrintMatchAndExplain(NodeProperties::GetValueInput(node, 0),
+                                 "value", value_matcher_, listener) &&
+            PrintMatchAndExplain(NodeProperties::GetControlInput(node, 0),
+                                 "control", control_matcher_, listener));
+  }
+
+ private:
+  const Matcher<Type*> type_matcher_;
+  const Matcher<Node*> value_matcher_;
+  const Matcher<Node*> control_matcher_;
+};
 
 class IsToNumberMatcher final : public NodeMatcher {
  public:
@@ -1406,6 +1453,86 @@
   const Matcher<Node*> context_matcher_;
 };
 
+class IsQuadopMatcher final : public NodeMatcher {
+ public:
+  IsQuadopMatcher(IrOpcode::Value opcode, const Matcher<Node*>& a_matcher,
+                  const Matcher<Node*>& b_matcher,
+                  const Matcher<Node*>& c_matcher,
+                  const Matcher<Node*>& d_matcher)
+      : NodeMatcher(opcode),
+        a_matcher_(a_matcher),
+        b_matcher_(b_matcher),
+        c_matcher_(c_matcher),
+        d_matcher_(d_matcher) {}
+
+  void DescribeTo(std::ostream* os) const final {
+    NodeMatcher::DescribeTo(os);
+    *os << " whose a (";
+    a_matcher_.DescribeTo(os);
+    *os << ") and b (";
+    b_matcher_.DescribeTo(os);
+    *os << ") and c (";
+    c_matcher_.DescribeTo(os);
+    *os << ") and d (";
+    d_matcher_.DescribeTo(os);
+    *os << ")";
+  }
+
+  bool MatchAndExplain(Node* node, MatchResultListener* listener) const final {
+    return (NodeMatcher::MatchAndExplain(node, listener) &&
+            PrintMatchAndExplain(NodeProperties::GetValueInput(node, 0), "a",
+                                 a_matcher_, listener) &&
+            PrintMatchAndExplain(NodeProperties::GetValueInput(node, 1), "b",
+                                 b_matcher_, listener) &&
+            PrintMatchAndExplain(NodeProperties::GetValueInput(node, 2), "c",
+                                 c_matcher_, listener) &&
+            PrintMatchAndExplain(NodeProperties::GetValueInput(node, 3), "d",
+                                 d_matcher_, listener));
+  }
+
+ private:
+  const Matcher<Node*> a_matcher_;
+  const Matcher<Node*> b_matcher_;
+  const Matcher<Node*> c_matcher_;
+  const Matcher<Node*> d_matcher_;
+};
+
+class IsTernopMatcher final : public NodeMatcher {
+ public:
+  IsTernopMatcher(IrOpcode::Value opcode, const Matcher<Node*>& lhs_matcher,
+                  const Matcher<Node*>& mid_matcher,
+                  const Matcher<Node*>& rhs_matcher)
+      : NodeMatcher(opcode),
+        lhs_matcher_(lhs_matcher),
+        mid_matcher_(mid_matcher),
+        rhs_matcher_(rhs_matcher) {}
+
+  void DescribeTo(std::ostream* os) const final {
+    NodeMatcher::DescribeTo(os);
+    *os << " whose lhs (";
+    lhs_matcher_.DescribeTo(os);
+    *os << ") and mid (";
+    mid_matcher_.DescribeTo(os);
+    *os << ") and rhs (";
+    rhs_matcher_.DescribeTo(os);
+    *os << ")";
+  }
+
+  bool MatchAndExplain(Node* node, MatchResultListener* listener) const final {
+    return (NodeMatcher::MatchAndExplain(node, listener) &&
+            PrintMatchAndExplain(NodeProperties::GetValueInput(node, 0), "lhs",
+                                 lhs_matcher_, listener) &&
+            PrintMatchAndExplain(NodeProperties::GetValueInput(node, 1), "mid",
+                                 mid_matcher_, listener) &&
+            PrintMatchAndExplain(NodeProperties::GetValueInput(node, 2), "rhs",
+                                 rhs_matcher_, listener));
+  }
+
+ private:
+  const Matcher<Node*> lhs_matcher_;
+  const Matcher<Node*> mid_matcher_;
+  const Matcher<Node*> rhs_matcher_;
+};
 
 class IsBinopMatcher final : public NodeMatcher {
  public:
@@ -1484,7 +1611,6 @@
 
 }  // namespace
 
-
 Matcher<Node*> IsDead() {
   return MakeMatcher(new NodeMatcher(IrOpcode::kDead));
 }
@@ -1938,6 +2064,12 @@
                                            effect_matcher, control_matcher));
 }
 
+Matcher<Node*> IsGuard(const Matcher<Type*>& type_matcher,
+                       const Matcher<Node*>& value_matcher,
+                       const Matcher<Node*>& control_matcher) {
+  return MakeMatcher(
+      new IsGuardMatcher(type_matcher, value_matcher, control_matcher));
+}
 
 Matcher<Node*> IsReferenceEqual(const Matcher<Type*>& type_matcher,
                                 const Matcher<Node*>& lhs_matcher,
@@ -2044,6 +2176,9 @@
                                         effect_matcher, control_matcher));
 }
 
+Matcher<Node*> IsStackSlot(const Matcher<MachineRepresentation>& rep_matcher) {
+  return MakeMatcher(new IsStackSlotMatcher(rep_matcher));
+}
 
 Matcher<Node*> IsToNumber(const Matcher<Node*>& base_matcher,
                           const Matcher<Node*>& context_matcher,
@@ -2069,6 +2204,29 @@
   return MakeMatcher(new NodeMatcher(IrOpcode::kLoadFramePointer));
 }
 
+#define IS_QUADOP_MATCHER(Name)                                               \
+  Matcher<Node*> Is##Name(                                                    \
+      const Matcher<Node*>& a_matcher, const Matcher<Node*>& b_matcher,       \
+      const Matcher<Node*>& c_matcher, const Matcher<Node*>& d_matcher) {     \
+    return MakeMatcher(new IsQuadopMatcher(IrOpcode::k##Name, a_matcher,      \
+                                           b_matcher, c_matcher, d_matcher)); \
+  }
+
+IS_QUADOP_MATCHER(Int32PairAdd)
+IS_QUADOP_MATCHER(Int32PairSub)
+IS_QUADOP_MATCHER(Int32PairMul)
+
+#define IS_TERNOP_MATCHER(Name)                                            \
+  Matcher<Node*> Is##Name(const Matcher<Node*>& lhs_matcher,               \
+                          const Matcher<Node*>& mid_matcher,               \
+                          const Matcher<Node*>& rhs_matcher) {             \
+    return MakeMatcher(new IsTernopMatcher(IrOpcode::k##Name, lhs_matcher, \
+                                           mid_matcher, rhs_matcher));     \
+  }
+
+IS_TERNOP_MATCHER(Word32PairShl)
+IS_TERNOP_MATCHER(Word32PairShr)
+IS_TERNOP_MATCHER(Word32PairSar)
 
 #define IS_BINOP_MATCHER(Name)                                            \
   Matcher<Node*> Is##Name(const Matcher<Node*>& lhs_matcher,              \
@@ -2083,8 +2241,10 @@
 IS_BINOP_MATCHER(NumberShiftLeft)
 IS_BINOP_MATCHER(NumberShiftRight)
 IS_BINOP_MATCHER(NumberShiftRightLogical)
+IS_BINOP_MATCHER(NumberImul)
 IS_BINOP_MATCHER(Word32And)
 IS_BINOP_MATCHER(Word32Or)
+IS_BINOP_MATCHER(Word32Xor)
 IS_BINOP_MATCHER(Word32Sar)
 IS_BINOP_MATCHER(Word32Shl)
 IS_BINOP_MATCHER(Word32Shr)
@@ -2146,6 +2306,8 @@
 IS_UNOP_MATCHER(ObjectIsReceiver)
 IS_UNOP_MATCHER(ObjectIsSmi)
 IS_UNOP_MATCHER(Word32Clz)
+IS_UNOP_MATCHER(Word32Ctz)
+IS_UNOP_MATCHER(Word32Popcnt)
 #undef IS_UNOP_MATCHER
 
 }  // namespace compiler
diff --git a/test/unittests/compiler/node-test-utils.h b/test/unittests/compiler/node-test-utils.h
index 03f2a3b..dd036c9 100644
--- a/test/unittests/compiler/node-test-utils.h
+++ b/test/unittests/compiler/node-test-utils.h
@@ -211,6 +211,8 @@
                                   const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsNumberShiftRightLogical(const Matcher<Node*>& lhs_matcher,
                                          const Matcher<Node*>& rhs_matcher);
+Matcher<Node*> IsNumberImul(const Matcher<Node*>& lhs_matcher,
+                            const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsAllocate(const Matcher<Node*>& size_matcher,
                           const Matcher<Node*>& effect_matcher,
                           const Matcher<Node*>& control_matcher);
@@ -261,10 +263,13 @@
                        const Matcher<Node*>& value_matcher,
                        const Matcher<Node*>& effect_matcher,
                        const Matcher<Node*>& control_matcher);
+Matcher<Node*> IsStackSlot(const Matcher<MachineRepresentation>& rep_matcher);
 Matcher<Node*> IsWord32And(const Matcher<Node*>& lhs_matcher,
                            const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsWord32Or(const Matcher<Node*>& lhs_matcher,
                           const Matcher<Node*>& rhs_matcher);
+Matcher<Node*> IsWord32Xor(const Matcher<Node*>& lhs_matcher,
+                           const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsWord32Sar(const Matcher<Node*>& lhs_matcher,
                            const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsWord32Shl(const Matcher<Node*>& lhs_matcher,
@@ -276,6 +281,8 @@
 Matcher<Node*> IsWord32Equal(const Matcher<Node*>& lhs_matcher,
                              const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsWord32Clz(const Matcher<Node*>& value_matcher);
+Matcher<Node*> IsWord32Ctz(const Matcher<Node*>& value_matcher);
+Matcher<Node*> IsWord32Popcnt(const Matcher<Node*>& value_matcher);
 Matcher<Node*> IsWord64And(const Matcher<Node*>& lhs_matcher,
                            const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsWord64Or(const Matcher<Node*>& lhs_matcher,
@@ -356,6 +363,35 @@
 Matcher<Node*> IsParameter(const Matcher<int> index_matcher);
 Matcher<Node*> IsLoadFramePointer();
 
+Matcher<Node*> IsInt32PairAdd(const Matcher<Node*>& a_matcher,
+                              const Matcher<Node*>& b_matcher,
+                              const Matcher<Node*>& c_matcher,
+                              const Matcher<Node*>& d_matcher);
+Matcher<Node*> IsInt32PairSub(const Matcher<Node*>& a_matcher,
+                              const Matcher<Node*>& b_matcher,
+                              const Matcher<Node*>& c_matcher,
+                              const Matcher<Node*>& d_matcher);
+Matcher<Node*> IsInt32PairMul(const Matcher<Node*>& a_matcher,
+                              const Matcher<Node*>& b_matcher,
+                              const Matcher<Node*>& c_matcher,
+                              const Matcher<Node*>& d_matcher);
+
+Matcher<Node*> IsWord32PairShl(const Matcher<Node*>& lhs_matcher,
+                               const Matcher<Node*>& mid_matcher,
+                               const Matcher<Node*>& rhs_matcher);
+Matcher<Node*> IsWord32PairShr(const Matcher<Node*>& lhs_matcher,
+                               const Matcher<Node*>& mid_matcher,
+                               const Matcher<Node*>& rhs_matcher);
+
+Matcher<Node*> IsWord32PairSar(const Matcher<Node*>& lhs_matcher,
+                               const Matcher<Node*>& mid_matcher,
+                               const Matcher<Node*>& rhs_matcher);
+
+Matcher<Node*> IsStackSlot();
+Matcher<Node*> IsGuard(const Matcher<Type*>& type_matcher,
+                       const Matcher<Node*>& value_matcher,
+                       const Matcher<Node*>& control_matcher);
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
diff --git a/test/unittests/compiler/s390/OWNERS b/test/unittests/compiler/s390/OWNERS
new file mode 100644
index 0000000..eb007cb
--- /dev/null
+++ b/test/unittests/compiler/s390/OWNERS
@@ -0,0 +1,5 @@
+jyan@ca.ibm.com
+dstence@us.ibm.com
+joransiu@ca.ibm.com
+mbrandy@us.ibm.com
+michael_dawson@ca.ibm.com
diff --git a/test/unittests/compiler/s390/instruction-selector-s390-unittest.cc b/test/unittests/compiler/s390/instruction-selector-s390-unittest.cc
new file mode 100644
index 0000000..5fe72ee
--- /dev/null
+++ b/test/unittests/compiler/s390/instruction-selector-s390-unittest.cc
@@ -0,0 +1,11 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "test/unittests/compiler/instruction-selector-unittest.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
diff --git a/test/unittests/compiler/scheduler-unittest.cc b/test/unittests/compiler/scheduler-unittest.cc
index 6cf0734..da77bdc 100644
--- a/test/unittests/compiler/scheduler-unittest.cc
+++ b/test/unittests/compiler/scheduler-unittest.cc
@@ -2,15 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/compiler/schedule.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/common-operator.h"
-#include "src/compiler/graph.h"
 #include "src/compiler/graph-visualizer.h"
+#include "src/compiler/graph.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
-#include "src/compiler/schedule.h"
 #include "src/compiler/scheduler.h"
 #include "src/compiler/simplified-operator.h"
 #include "src/compiler/source-position.h"
@@ -136,6 +136,51 @@
   ComputeAndVerifySchedule(13);
 }
 
+TARGET_TEST_F(SchedulerTest, FloatingDeadDiamond1) {
+  Node* start = graph()->NewNode(common()->Start(1));
+  graph()->SetStart(start);
+
+  Node* p0 = graph()->NewNode(common()->Parameter(0), start);
+  Node* d1 = CreateDiamond(graph(), common(), p0);
+  USE(d1);
+  Node* ret = graph()->NewNode(common()->Return(), p0, start, start);
+  Node* end = graph()->NewNode(common()->End(1), ret);
+
+  graph()->SetEnd(end);
+
+  ComputeAndVerifySchedule(4);
+}
+
+TARGET_TEST_F(SchedulerTest, FloatingDeadDiamond2) {
+  Graph* g = graph();
+  Node* start = g->NewNode(common()->Start(1));
+  g->SetStart(start);
+
+  Node* n1 = g->NewNode(common()->Parameter(1), start);
+
+  Node* n2 = g->NewNode(common()->Branch(), n1, start);
+  Node* n3 = g->NewNode(common()->IfTrue(), n2);
+  Node* n4 = g->NewNode(common()->IfFalse(), n2);
+  Node* n5 = g->NewNode(common()->Int32Constant(-100));
+  Node* n6 = g->NewNode(common()->Return(), n5, start, n4);
+  Node* n7 = g->NewNode(common()->Int32Constant(0));
+  Node* n8 = g->NewNode(common()->Return(), n7, start, n3);
+  Node* n9 = g->NewNode(common()->End(2), n6, n8);
+
+  // Dead nodes
+  Node* n10 = g->NewNode(common()->Branch(), n1, n3);
+  Node* n11 = g->NewNode(common()->IfTrue(), n10);
+  Node* n12 = g->NewNode(common()->IfFalse(), n10);
+  Node* n13 = g->NewNode(common()->Merge(2), n11, n12);
+  Node* n14 =
+      g->NewNode(common()->Phi(MachineRepresentation::kWord32, 2), n1, n7, n13);
+
+  USE(n14);
+
+  g->SetEnd(n9);
+
+  ComputeAndVerifySchedule(10);
+}
 
 TARGET_TEST_F(SchedulerTest, FloatingDiamond2) {
   Node* start = graph()->NewNode(common()->Start(2));
diff --git a/test/unittests/compiler/select-lowering-unittest.cc b/test/unittests/compiler/select-lowering-unittest.cc
deleted file mode 100644
index 43cfd84..0000000
--- a/test/unittests/compiler/select-lowering-unittest.cc
+++ /dev/null
@@ -1,74 +0,0 @@
-// Copyright 2014 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/compiler/select-lowering.h"
-#include "test/unittests/compiler/graph-unittest.h"
-#include "test/unittests/compiler/node-test-utils.h"
-#include "testing/gmock-support.h"
-
-using testing::AllOf;
-using testing::Capture;
-using testing::CaptureEq;
-using testing::Not;
-
-namespace v8 {
-namespace internal {
-namespace compiler {
-
-class SelectLoweringTest : public GraphTest {
- public:
-  SelectLoweringTest() : GraphTest(5), lowering_(graph(), common()) {}
-
- protected:
-  Reduction Reduce(Node* node) { return lowering_.Reduce(node); }
-
- private:
-  SelectLowering lowering_;
-};
-
-
-TEST_F(SelectLoweringTest, SelectWithSameConditions) {
-  Node* const p0 = Parameter(0);
-  Node* const p1 = Parameter(1);
-  Node* const p2 = Parameter(2);
-  Node* const p3 = Parameter(3);
-  Node* const p4 = Parameter(4);
-  Node* const s0 = graph()->NewNode(
-      common()->Select(MachineRepresentation::kWord32), p0, p1, p2);
-
-  Capture<Node*> branch;
-  Capture<Node*> merge;
-  {
-    Reduction const r = Reduce(s0);
-    ASSERT_TRUE(r.Changed());
-    EXPECT_THAT(
-        r.replacement(),
-        IsPhi(
-            MachineRepresentation::kWord32, p1, p2,
-            AllOf(CaptureEq(&merge),
-                  IsMerge(IsIfTrue(CaptureEq(&branch)),
-                          IsIfFalse(AllOf(CaptureEq(&branch),
-                                          IsBranch(p0, graph()->start())))))));
-  }
-  {
-    Reduction const r = Reduce(graph()->NewNode(
-        common()->Select(MachineRepresentation::kWord32), p0, p3, p4));
-    ASSERT_TRUE(r.Changed());
-    EXPECT_THAT(r.replacement(), IsPhi(MachineRepresentation::kWord32, p3, p4,
-                                       CaptureEq(&merge)));
-  }
-  {
-    // We must not reuse the diamond if it is reachable from either else/then
-    // values of the Select, because the resulting graph can not be scheduled.
-    Reduction const r = Reduce(graph()->NewNode(
-        common()->Select(MachineRepresentation::kWord32), p0, s0, p0));
-    ASSERT_TRUE(r.Changed());
-    EXPECT_THAT(r.replacement(), IsPhi(MachineRepresentation::kWord32, s0, p0,
-                                       Not(CaptureEq(&merge))));
-  }
-}
-
-}  // namespace compiler
-}  // namespace internal
-}  // namespace v8
diff --git a/test/unittests/compiler/zone-pool-unittest.cc b/test/unittests/compiler/zone-pool-unittest.cc
index 3bfde4b..47f1cc5 100644
--- a/test/unittests/compiler/zone-pool-unittest.cc
+++ b/test/unittests/compiler/zone-pool-unittest.cc
@@ -12,7 +12,7 @@
 
 class ZonePoolTest : public TestWithIsolate {
  public:
-  ZonePoolTest() {}
+  ZonePoolTest() : zone_pool_(&allocator_) {}
 
  protected:
   ZonePool* zone_pool() { return &zone_pool_; }
@@ -38,6 +38,7 @@
   }
 
  private:
+  base::AccountingAllocator allocator_;
   ZonePool zone_pool_;
   base::RandomNumberGenerator rng;
 };
diff --git a/test/unittests/heap/gc-idle-time-handler-unittest.cc b/test/unittests/heap/gc-idle-time-handler-unittest.cc
index 6413e36..99351b5 100644
--- a/test/unittests/heap/gc-idle-time-handler-unittest.cc
+++ b/test/unittests/heap/gc-idle-time-handler-unittest.cc
@@ -74,43 +74,6 @@
 }
 
 
-TEST(GCIdleTimeHandler, EstimateMarkCompactTimeInitial) {
-  size_t size = 100 * MB;
-  size_t time = GCIdleTimeHandler::EstimateMarkCompactTime(size, 0);
-  EXPECT_EQ(size / GCIdleTimeHandler::kInitialConservativeMarkCompactSpeed,
-            time);
-}
-
-
-TEST(GCIdleTimeHandler, EstimateMarkCompactTimeNonZero) {
-  size_t size = 100 * MB;
-  size_t speed = 1 * MB;
-  size_t time = GCIdleTimeHandler::EstimateMarkCompactTime(size, speed);
-  EXPECT_EQ(size / speed, time);
-}
-
-
-TEST(GCIdleTimeHandler, EstimateMarkCompactTimeMax) {
-  size_t size = std::numeric_limits<size_t>::max();
-  size_t speed = 1;
-  size_t time = GCIdleTimeHandler::EstimateMarkCompactTime(size, speed);
-  EXPECT_EQ(GCIdleTimeHandler::kMaxMarkCompactTimeInMs, time);
-}
-
-
-TEST_F(GCIdleTimeHandlerTest, ShouldDoMarkCompact) {
-  size_t idle_time_ms = GCIdleTimeHandler::kMaxScheduledIdleTime;
-  EXPECT_TRUE(GCIdleTimeHandler::ShouldDoMarkCompact(idle_time_ms, 0, 0));
-}
-
-
-TEST_F(GCIdleTimeHandlerTest, DontDoMarkCompact) {
-  size_t idle_time_ms = 1;
-  EXPECT_FALSE(GCIdleTimeHandler::ShouldDoMarkCompact(
-      idle_time_ms, kSizeOfObjects, kMarkingSpeed));
-}
-
-
 TEST_F(GCIdleTimeHandlerTest, ShouldDoFinalIncrementalMarkCompact) {
   size_t idle_time_ms = 16;
   EXPECT_TRUE(GCIdleTimeHandler::ShouldDoFinalIncrementalMarkCompact(
diff --git a/test/unittests/heap/gc-tracer-unittest.cc b/test/unittests/heap/gc-tracer-unittest.cc
new file mode 100644
index 0000000..2bf4d03
--- /dev/null
+++ b/test/unittests/heap/gc-tracer-unittest.cc
@@ -0,0 +1,49 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <cmath>
+#include <limits>
+
+#include "src/heap/gc-tracer.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace v8 {
+namespace internal {
+
+TEST(GCTracer, AverageSpeed) {
+  RingBuffer<BytesAndDuration> buffer;
+  EXPECT_EQ(100 / 2,
+            GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(100, 2), 0));
+  buffer.Push(MakeBytesAndDuration(100, 8));
+  EXPECT_EQ(100 / 2,
+            GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(100, 2), 2));
+  EXPECT_EQ(200 / 10,
+            GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(100, 2), 3));
+  const int max_speed = 1024 * MB;
+  buffer.Reset();
+  buffer.Push(MakeBytesAndDuration(max_speed, 0.5));
+  EXPECT_EQ(max_speed,
+            GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(0, 0), 1));
+  const int min_speed = 1;
+  buffer.Reset();
+  buffer.Push(MakeBytesAndDuration(1, 10000));
+  EXPECT_EQ(min_speed,
+            GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(0, 0), 1));
+  buffer.Reset();
+  int sum = 0;
+  for (int i = 0; i < buffer.kSize; i++) {
+    sum += i + 1;
+    buffer.Push(MakeBytesAndDuration(i + 1, 1));
+  }
+  EXPECT_EQ(
+      sum * 1.0 / buffer.kSize,
+      GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(0, 0), buffer.kSize));
+  buffer.Push(MakeBytesAndDuration(100, 1));
+  EXPECT_EQ(
+      (sum * 1.0 - 1 + 100) / buffer.kSize,
+      GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(0, 0), buffer.kSize));
+}
+
+}  // namespace internal
+}  // namespace v8
diff --git a/test/unittests/heap/scavenge-job-unittest.cc b/test/unittests/heap/scavenge-job-unittest.cc
index dbd463c..91abbb1 100644
--- a/test/unittests/heap/scavenge-job-unittest.cc
+++ b/test/unittests/heap/scavenge-job-unittest.cc
@@ -71,7 +71,7 @@
   EXPECT_FALSE(ScavengeJob::ReachedIdleAllocationLimit(
       scavenge_speed, expected_size - 1, kNewSpaceCapacity));
   EXPECT_TRUE(ScavengeJob::ReachedIdleAllocationLimit(
-      scavenge_speed, expected_size, kNewSpaceCapacity));
+      scavenge_speed, expected_size + 1, kNewSpaceCapacity));
 }
 
 
diff --git a/test/unittests/heap/slot-set-unittest.cc b/test/unittests/heap/slot-set-unittest.cc
index 3761889..26a26f0 100644
--- a/test/unittests/heap/slot-set-unittest.cc
+++ b/test/unittests/heap/slot-set-unittest.cc
@@ -55,9 +55,9 @@
   set.Iterate([](Address slot_address) {
     uintptr_t intaddr = reinterpret_cast<uintptr_t>(slot_address);
     if (intaddr % 3 == 0) {
-      return SlotSet::KEEP_SLOT;
+      return KEEP_SLOT;
     } else {
-      return SlotSet::REMOVE_SLOT;
+      return REMOVE_SLOT;
     }
   });
 
@@ -139,5 +139,33 @@
   }
 }
 
+TEST(TypedSlotSet, Iterate) {
+  TypedSlotSet set(0);
+  const int kDelta = 10000001;
+  int added = 0;
+  for (uint32_t i = 0; i < TypedSlotSet::kMaxOffset; i += kDelta) {
+    SlotType type = static_cast<SlotType>(i % NUMBER_OF_SLOT_TYPES);
+    set.Insert(type, i);
+    ++added;
+  }
+  int iterated = 0;
+  set.Iterate([&iterated, kDelta](SlotType type, Address addr) {
+    uint32_t i = static_cast<uint32_t>(reinterpret_cast<uintptr_t>(addr));
+    EXPECT_EQ(i % NUMBER_OF_SLOT_TYPES, static_cast<uint32_t>(type));
+    EXPECT_EQ(0, i % kDelta);
+    ++iterated;
+    return i % 2 == 0 ? KEEP_SLOT : REMOVE_SLOT;
+  });
+  EXPECT_EQ(added, iterated);
+  iterated = 0;
+  set.Iterate([&iterated](SlotType type, Address addr) {
+    uint32_t i = static_cast<uint32_t>(reinterpret_cast<uintptr_t>(addr));
+    EXPECT_EQ(0, i % 2);
+    ++iterated;
+    return KEEP_SLOT;
+  });
+  EXPECT_EQ(added / 2, iterated);
+}
+
 }  // namespace internal
 }  // namespace v8
diff --git a/test/unittests/interpreter/bytecode-array-builder-unittest.cc b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
index 839215f..255d836 100644
--- a/test/unittests/interpreter/bytecode-array-builder-unittest.cc
+++ b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
@@ -139,7 +139,6 @@
   builder.CompareOperation(Token::Value::EQ, reg)
       .CompareOperation(Token::Value::NE, reg)
       .CompareOperation(Token::Value::EQ_STRICT, reg)
-      .CompareOperation(Token::Value::NE_STRICT, reg)
       .CompareOperation(Token::Value::LT, reg)
       .CompareOperation(Token::Value::GT, reg)
       .CompareOperation(Token::Value::LTE, reg)
@@ -161,6 +160,21 @@
       .JumpIfUndefined(&start)
       .JumpIfNotHole(&start);
 
+  // Longer jumps with constant operands
+  BytecodeLabel end[8];
+  builder.Jump(&end[0])
+      .LoadTrue()
+      .JumpIfTrue(&end[1])
+      .LoadTrue()
+      .JumpIfFalse(&end[2])
+      .LoadLiteral(Smi::FromInt(0))
+      .JumpIfTrue(&end[3])
+      .LoadLiteral(Smi::FromInt(0))
+      .JumpIfFalse(&end[4])
+      .JumpIfNull(&end[5])
+      .JumpIfUndefined(&end[6])
+      .JumpIfNotHole(&end[7]);
+
   // Perform an operation that returns boolean value to
   // generate JumpIfTrue/False
   builder.CompareOperation(Token::Value::EQ, reg)
@@ -205,11 +219,11 @@
 
   builder.ForInPrepare(reg)
       .ForInDone(reg, reg)
-      .ForInNext(reg, reg, reg)
+      .ForInNext(reg, reg, reg, 1)
       .ForInStep(reg);
   builder.ForInPrepare(wide)
       .ForInDone(reg, other)
-      .ForInNext(wide, wide, wide)
+      .ForInNext(wide, wide, wide, 1024)
       .ForInStep(reg);
 
   // Wide constant pool loads
@@ -223,9 +237,13 @@
   // Emit wide global load / store operations.
   builder.LoadGlobal(name, 1024, TypeofMode::NOT_INSIDE_TYPEOF)
       .LoadGlobal(name, 1024, TypeofMode::INSIDE_TYPEOF)
+      .LoadGlobal(name, 1024, TypeofMode::INSIDE_TYPEOF)
       .StoreGlobal(name, 1024, LanguageMode::SLOPPY)
       .StoreGlobal(wide_name, 1, LanguageMode::STRICT);
 
+  // Emit extra wide global load.
+  builder.LoadGlobal(name, 1024 * 1024, TypeofMode::NOT_INSIDE_TYPEOF);
+
   // Emit wide load / store property operations.
   builder.LoadNamedProperty(reg, wide_name, 0)
       .LoadKeyedProperty(reg, 2056)
@@ -271,28 +289,44 @@
       .BinaryOperation(Token::Value::ADD, reg)
       .JumpIfFalse(&start);
 
-  builder.Debugger();
+  // Intrinsics handled by the interpreter.
+  builder.CallRuntime(Runtime::kInlineIsArray, reg, 1)
+      .CallRuntime(Runtime::kInlineIsArray, wide, 1);
 
+  builder.Debugger();
+  for (size_t i = 0; i < arraysize(end); i++) {
+    builder.Bind(&end[i]);
+  }
   builder.Return();
 
   // Generate BytecodeArray.
   Handle<BytecodeArray> the_array = builder.ToBytecodeArray();
   CHECK_EQ(the_array->frame_size(),
-           (builder.fixed_and_temporary_register_count() +
-            builder.translation_register_count()) *
-               kPointerSize);
+           builder.fixed_and_temporary_register_count() * kPointerSize);
 
   // Build scorecard of bytecodes encountered in the BytecodeArray.
   std::vector<int> scorecard(Bytecodes::ToByte(Bytecode::kLast) + 1);
+
   Bytecode final_bytecode = Bytecode::kLdaZero;
   int i = 0;
   while (i < the_array->length()) {
     uint8_t code = the_array->get(i);
     scorecard[code] += 1;
     final_bytecode = Bytecodes::FromByte(code);
-    i += Bytecodes::Size(Bytecodes::FromByte(code));
+    OperandScale operand_scale = OperandScale::kSingle;
+    int prefix_offset = 0;
+    if (Bytecodes::IsPrefixScalingBytecode(final_bytecode)) {
+      operand_scale = Bytecodes::PrefixBytecodeToOperandScale(final_bytecode);
+      prefix_offset = 1;
+      code = the_array->get(i + 1);
+      final_bytecode = Bytecodes::FromByte(code);
+    }
+    i += prefix_offset + Bytecodes::Size(final_bytecode, operand_scale);
   }
 
+  // Insert entry for illegal bytecode as this is never willingly emitted.
+  scorecard[Bytecodes::ToByte(Bytecode::kIllegal)] = 1;
+
   // Check return occurs at the end and only once in the BytecodeArray.
   CHECK_EQ(final_bytecode, Bytecode::kReturn);
   CHECK_EQ(scorecard[Bytecodes::ToByte(final_bytecode)], 1);
@@ -330,7 +364,7 @@
 
 TEST_F(BytecodeArrayBuilderTest, RegisterValues) {
   int index = 1;
-  uint8_t operand = static_cast<uint8_t>(-index);
+  int32_t operand = -index;
 
   Register the_register(index);
   CHECK_EQ(the_register.index(), index);
@@ -531,6 +565,12 @@
   for (int i = 0; i < 63; i++) {
     builder.Jump(&label4);
   }
+
+  // Add padding to force wide backwards jumps.
+  for (int i = 0; i < 256; i++) {
+    builder.LoadTrue();
+  }
+
   builder.BinaryOperation(Token::Value::ADD, reg).JumpIfFalse(&label4);
   builder.BinaryOperation(Token::Value::ADD, reg).JumpIfTrue(&label3);
   builder.CompareOperation(Token::Value::EQ, reg).JumpIfFalse(&label2);
@@ -546,51 +586,65 @@
   // Ignore compare operation.
   iterator.Advance();
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfTrue);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK_EQ(iterator.GetImmediateOperand(0), -2);
   iterator.Advance();
   // Ignore compare operation.
   iterator.Advance();
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfFalse);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK_EQ(iterator.GetImmediateOperand(0), -2);
   iterator.Advance();
   // Ignore binary operation.
   iterator.Advance();
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanTrue);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK_EQ(iterator.GetImmediateOperand(0), -2);
   iterator.Advance();
   // Ignore binary operation.
   iterator.Advance();
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanFalse);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK_EQ(iterator.GetImmediateOperand(0), -2);
   iterator.Advance();
   for (int i = 0; i < 63; i++) {
     CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
+    CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
     CHECK_EQ(iterator.GetImmediateOperand(0), -i * 2 - 4);
     iterator.Advance();
   }
+  // Check padding to force wide backwards jumps.
+  for (int i = 0; i < 256; i++) {
+    CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaTrue);
+    iterator.Advance();
+  }
   // Ignore binary operation.
   iterator.Advance();
-  CHECK_EQ(iterator.current_bytecode(),
-           Bytecode::kJumpIfToBooleanFalseConstant);
-  CHECK_EQ(Smi::cast(*iterator.GetConstantForIndexOperand(0))->value(), -132);
+  CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanFalse);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kDouble);
+  CHECK_EQ(iterator.GetImmediateOperand(0), -389);
   iterator.Advance();
   // Ignore binary operation.
   iterator.Advance();
-  CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanTrueConstant);
-  CHECK_EQ(Smi::cast(*iterator.GetConstantForIndexOperand(0))->value(), -140);
+  CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanTrue);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kDouble);
+  CHECK_EQ(iterator.GetImmediateOperand(0), -399);
   iterator.Advance();
   // Ignore compare operation.
   iterator.Advance();
-  CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfFalseConstant);
-  CHECK_EQ(Smi::cast(*iterator.GetConstantForIndexOperand(0))->value(), -148);
+  CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfFalse);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kDouble);
+  CHECK_EQ(iterator.GetImmediateOperand(0), -409);
   iterator.Advance();
   // Ignore compare operation.
   iterator.Advance();
-  CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfTrueConstant);
-  CHECK_EQ(Smi::cast(*iterator.GetConstantForIndexOperand(0))->value(), -156);
+  CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfTrue);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kDouble);
+  CHECK_EQ(iterator.GetImmediateOperand(0), -419);
   iterator.Advance();
-  CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpConstant);
-  CHECK_EQ(Smi::cast(*iterator.GetConstantForIndexOperand(0))->value(), -160);
+  CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kDouble);
+  CHECK_EQ(iterator.GetImmediateOperand(0), -425);
   iterator.Advance();
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
   iterator.Advance();
@@ -652,6 +706,85 @@
   CHECK(iterator.done());
 }
 
+TEST_F(BytecodeArrayBuilderTest, OperandScales) {
+  CHECK_EQ(BytecodeArrayBuilder::OperandSizesToScale(OperandSize::kByte),
+           OperandScale::kSingle);
+  CHECK_EQ(BytecodeArrayBuilder::OperandSizesToScale(OperandSize::kShort),
+           OperandScale::kDouble);
+  CHECK_EQ(BytecodeArrayBuilder::OperandSizesToScale(OperandSize::kQuad),
+           OperandScale::kQuadruple);
+  CHECK_EQ(BytecodeArrayBuilder::OperandSizesToScale(
+               OperandSize::kShort, OperandSize::kShort, OperandSize::kShort,
+               OperandSize::kShort),
+           OperandScale::kDouble);
+  CHECK_EQ(BytecodeArrayBuilder::OperandSizesToScale(
+               OperandSize::kQuad, OperandSize::kShort, OperandSize::kShort,
+               OperandSize::kShort),
+           OperandScale::kQuadruple);
+  CHECK_EQ(BytecodeArrayBuilder::OperandSizesToScale(
+               OperandSize::kShort, OperandSize::kQuad, OperandSize::kShort,
+               OperandSize::kShort),
+           OperandScale::kQuadruple);
+  CHECK_EQ(BytecodeArrayBuilder::OperandSizesToScale(
+               OperandSize::kShort, OperandSize::kShort, OperandSize::kQuad,
+               OperandSize::kShort),
+           OperandScale::kQuadruple);
+  CHECK_EQ(BytecodeArrayBuilder::OperandSizesToScale(
+               OperandSize::kShort, OperandSize::kShort, OperandSize::kShort,
+               OperandSize::kQuad),
+           OperandScale::kQuadruple);
+}
+
+TEST_F(BytecodeArrayBuilderTest, SizesForSignOperands) {
+  CHECK(BytecodeArrayBuilder::SizeForSignedOperand(0) == OperandSize::kByte);
+  CHECK(BytecodeArrayBuilder::SizeForSignedOperand(kMaxInt8) ==
+        OperandSize::kByte);
+  CHECK(BytecodeArrayBuilder::SizeForSignedOperand(kMinInt8) ==
+        OperandSize::kByte);
+  CHECK(BytecodeArrayBuilder::SizeForSignedOperand(kMaxInt8 + 1) ==
+        OperandSize::kShort);
+  CHECK(BytecodeArrayBuilder::SizeForSignedOperand(kMinInt8 - 1) ==
+        OperandSize::kShort);
+  CHECK(BytecodeArrayBuilder::SizeForSignedOperand(kMaxInt16) ==
+        OperandSize::kShort);
+  CHECK(BytecodeArrayBuilder::SizeForSignedOperand(kMinInt16) ==
+        OperandSize::kShort);
+  CHECK(BytecodeArrayBuilder::SizeForSignedOperand(kMaxInt16 + 1) ==
+        OperandSize::kQuad);
+  CHECK(BytecodeArrayBuilder::SizeForSignedOperand(kMinInt16 - 1) ==
+        OperandSize::kQuad);
+  CHECK(BytecodeArrayBuilder::SizeForSignedOperand(kMaxInt) ==
+        OperandSize::kQuad);
+  CHECK(BytecodeArrayBuilder::SizeForSignedOperand(kMinInt) ==
+        OperandSize::kQuad);
+}
+
+TEST_F(BytecodeArrayBuilderTest, SizesForUnsignOperands) {
+  // int overloads
+  CHECK(BytecodeArrayBuilder::SizeForUnsignedOperand(0) == OperandSize::kByte);
+  CHECK(BytecodeArrayBuilder::SizeForUnsignedOperand(kMaxUInt8) ==
+        OperandSize::kByte);
+  CHECK(BytecodeArrayBuilder::SizeForUnsignedOperand(kMaxUInt8 + 1) ==
+        OperandSize::kShort);
+  CHECK(BytecodeArrayBuilder::SizeForUnsignedOperand(kMaxUInt16) ==
+        OperandSize::kShort);
+  CHECK(BytecodeArrayBuilder::SizeForUnsignedOperand(kMaxUInt16 + 1) ==
+        OperandSize::kQuad);
+  // size_t overloads
+  CHECK(BytecodeArrayBuilder::SizeForUnsignedOperand(static_cast<size_t>(0)) ==
+        OperandSize::kByte);
+  CHECK(BytecodeArrayBuilder::SizeForUnsignedOperand(
+            static_cast<size_t>(kMaxUInt8)) == OperandSize::kByte);
+  CHECK(BytecodeArrayBuilder::SizeForUnsignedOperand(
+            static_cast<size_t>(kMaxUInt8 + 1)) == OperandSize::kShort);
+  CHECK(BytecodeArrayBuilder::SizeForUnsignedOperand(
+            static_cast<size_t>(kMaxUInt16)) == OperandSize::kShort);
+  CHECK(BytecodeArrayBuilder::SizeForUnsignedOperand(
+            static_cast<size_t>(kMaxUInt16 + 1)) == OperandSize::kQuad);
+  CHECK(BytecodeArrayBuilder::SizeForUnsignedOperand(
+            static_cast<size_t>(kMaxUInt32)) == OperandSize::kQuad);
+}
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
diff --git a/test/unittests/interpreter/bytecode-array-iterator-unittest.cc b/test/unittests/interpreter/bytecode-array-iterator-unittest.cc
index f2dcd71..43c6caa 100644
--- a/test/unittests/interpreter/bytecode-array-iterator-unittest.cc
+++ b/test/unittests/interpreter/bytecode-array-iterator-unittest.cc
@@ -22,7 +22,7 @@
 TEST_F(BytecodeArrayIteratorTest, IteratesBytecodeArray) {
   // Use a builder to create an array with containing multiple bytecodes
   // with 0, 1 and 2 operands.
-  BytecodeArrayBuilder builder(isolate(), zone(), 3, 2, 0);
+  BytecodeArrayBuilder builder(isolate(), zone(), 3, 3, 0);
   Factory* factory = isolate()->factory();
   Handle<HeapObject> heap_num_0 = factory->NewHeapNumber(2.718);
   Handle<HeapObject> heap_num_1 = factory->NewHeapNumber(2147483647);
@@ -31,9 +31,9 @@
   Smi* smi_1 = Smi::FromInt(-65536);
   Register reg_0(0);
   Register reg_1(1);
-  Register reg_2 = Register::FromParameterIndex(2, builder.parameter_count());
+  Register param = Register::FromParameterIndex(2, builder.parameter_count());
   Handle<String> name = factory->NewStringFromStaticChars("abc");
-  int name_index = 3;
+  int name_index = 2;
   int feedback_slot = 97;
 
   builder.LoadLiteral(heap_num_0)
@@ -43,67 +43,139 @@
       .LoadLiteral(smi_1)
       .LoadAccumulatorWithRegister(reg_0)
       .LoadNamedProperty(reg_1, name, feedback_slot)
-      .StoreAccumulatorInRegister(reg_2)
+      .StoreAccumulatorInRegister(param)
+      .CallRuntimeForPair(Runtime::kLoadLookupSlotForCall, param, 1, reg_0)
+      .ForInPrepare(reg_0)
       .CallRuntime(Runtime::kLoadIC_Miss, reg_0, 1)
       .Debugger()
+      .LoadGlobal(name, 0x10000000, TypeofMode::NOT_INSIDE_TYPEOF)
       .Return();
 
   // Test iterator sees the expected output from the builder.
   BytecodeArrayIterator iterator(builder.ToBytecodeArray());
+  const int kPrefixByteSize = 1;
+  int offset = 0;
+
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaConstant);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK(iterator.GetConstantForIndexOperand(0).is_identical_to(heap_num_0));
   CHECK(!iterator.done());
+  offset += Bytecodes::Size(Bytecode::kLdaConstant, OperandScale::kSingle);
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaConstant);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK(iterator.GetConstantForIndexOperand(0).is_identical_to(heap_num_1));
   CHECK(!iterator.done());
+  offset += Bytecodes::Size(Bytecode::kLdaConstant, OperandScale::kSingle);
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaZero);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK(!iterator.done());
+  offset += Bytecodes::Size(Bytecode::kLdaZero, OperandScale::kSingle);
   iterator.Advance();
 
-  CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaSmi8);
+  CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaSmi);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK_EQ(Smi::FromInt(iterator.GetImmediateOperand(0)), smi_0);
   CHECK(!iterator.done());
+  offset += Bytecodes::Size(Bytecode::kLdaSmi, OperandScale::kSingle);
   iterator.Advance();
 
-  CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaConstant);
-  CHECK_EQ(*iterator.GetConstantForIndexOperand(0), smi_1);
+  CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaSmi);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kQuadruple);
+  CHECK_EQ(Smi::FromInt(iterator.GetImmediateOperand(0)), smi_1);
   CHECK(!iterator.done());
+  offset += Bytecodes::Size(Bytecode::kLdaSmi, OperandScale::kQuadruple) +
+            kPrefixByteSize;
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdar);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK_EQ(iterator.GetRegisterOperand(0).index(), reg_0.index());
   CHECK(!iterator.done());
+  offset += Bytecodes::Size(Bytecode::kLdar, OperandScale::kSingle);
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kLoadIC);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK_EQ(iterator.GetRegisterOperand(0).index(), reg_1.index());
   CHECK_EQ(iterator.GetIndexOperand(1), name_index);
   CHECK_EQ(iterator.GetIndexOperand(2), feedback_slot);
   CHECK(!iterator.done());
+  offset += Bytecodes::Size(Bytecode::kLoadIC, OperandScale::kSingle);
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kStar);
-  CHECK_EQ(iterator.GetRegisterOperand(0).index(), reg_2.index());
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
+  CHECK_EQ(iterator.GetRegisterOperand(0).index(), param.index());
+  CHECK_EQ(iterator.GetRegisterOperandRange(0), 1);
   CHECK(!iterator.done());
+  offset += Bytecodes::Size(Bytecode::kStar, OperandScale::kSingle);
+  iterator.Advance();
+
+  CHECK_EQ(iterator.current_bytecode(), Bytecode::kCallRuntimeForPair);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
+  CHECK_EQ(iterator.GetRuntimeIdOperand(0), Runtime::kLoadLookupSlotForCall);
+  CHECK_EQ(iterator.GetRegisterOperand(1).index(), param.index());
+  CHECK_EQ(iterator.GetRegisterOperandRange(1), 1);
+  CHECK_EQ(iterator.GetRegisterCountOperand(2), 1);
+  CHECK_EQ(iterator.GetRegisterOperand(3).index(), reg_0.index());
+  CHECK_EQ(iterator.GetRegisterOperandRange(3), 2);
+  CHECK(!iterator.done());
+  offset +=
+      Bytecodes::Size(Bytecode::kCallRuntimeForPair, OperandScale::kSingle);
+  iterator.Advance();
+
+  CHECK_EQ(iterator.current_bytecode(), Bytecode::kForInPrepare);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
+  CHECK_EQ(iterator.GetRegisterOperand(0).index(), reg_0.index());
+  CHECK_EQ(iterator.GetRegisterOperandRange(0), 3);
+  CHECK(!iterator.done());
+  offset += Bytecodes::Size(Bytecode::kForInPrepare, OperandScale::kSingle);
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kCallRuntime);
-  CHECK_EQ(static_cast<Runtime::FunctionId>(iterator.GetIndexOperand(0)),
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
+  CHECK_EQ(static_cast<Runtime::FunctionId>(iterator.GetRuntimeIdOperand(0)),
            Runtime::kLoadIC_Miss);
   CHECK_EQ(iterator.GetRegisterOperand(1).index(), reg_0.index());
   CHECK_EQ(iterator.GetRegisterCountOperand(2), 1);
   CHECK(!iterator.done());
+  offset += Bytecodes::Size(Bytecode::kCallRuntime, OperandScale::kSingle);
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kDebugger);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK(!iterator.done());
+  offset += Bytecodes::Size(Bytecode::kDebugger, OperandScale::kSingle);
+  iterator.Advance();
+
+  CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaGlobal);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kQuadruple);
+  CHECK_EQ(iterator.current_bytecode_size(), 10);
+  CHECK_EQ(iterator.GetIndexOperand(1), 0x10000000);
+  offset += Bytecodes::Size(Bytecode::kLdaGlobal, OperandScale::kQuadruple) +
+            kPrefixByteSize;
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK(!iterator.done());
   iterator.Advance();
   CHECK(iterator.done());
diff --git a/test/unittests/interpreter/bytecode-register-allocator-unittest.cc b/test/unittests/interpreter/bytecode-register-allocator-unittest.cc
index ec29935..d4dc111 100644
--- a/test/unittests/interpreter/bytecode-register-allocator-unittest.cc
+++ b/test/unittests/interpreter/bytecode-register-allocator-unittest.cc
@@ -140,29 +140,6 @@
   }
 }
 
-TEST_F(TemporaryRegisterAllocatorTest, RangeAvoidsTranslationBoundary) {
-  int boundary = RegisterTranslator::DistanceToTranslationWindow(Register(0));
-  int limit = boundary + 64;
-
-  for (int run_length = 2; run_length < 32; run_length += 7) {
-    ZoneVector<int> run_starts(zone());
-    for (int start = 0; start < limit; start += run_length) {
-      int run_start =
-          allocator()->PrepareForConsecutiveTemporaryRegisters(run_length);
-      run_starts.push_back(run_start);
-      for (int i = 0; i < run_length; i++) {
-        allocator()->BorrowConsecutiveTemporaryRegister(run_start + i);
-      }
-      CHECK(run_start >= boundary || run_start + run_length <= boundary);
-    }
-    for (size_t batch = 0; batch < run_starts.size(); batch++) {
-      for (int i = run_starts[batch]; i < run_starts[batch] + run_length; i++) {
-        allocator()->ReturnTemporaryRegister(i);
-      }
-    }
-  }
-}
-
 TEST_F(TemporaryRegisterAllocatorTest, NotInRange) {
   for (int i = 0; i < 10; i++) {
     int reg = allocator()->BorrowTemporaryRegisterNotInRange(2, 5);
diff --git a/test/unittests/interpreter/bytecodes-unittest.cc b/test/unittests/interpreter/bytecodes-unittest.cc
index 212e029..b3554c3 100644
--- a/test/unittests/interpreter/bytecodes-unittest.cc
+++ b/test/unittests/interpreter/bytecodes-unittest.cc
@@ -14,28 +14,27 @@
 namespace interpreter {
 
 TEST(OperandConversion, Registers) {
-  int register_count = Register::MaxRegisterIndex() + 1;
+  int register_count = 128;
   int step = register_count / 7;
   for (int i = 0; i < register_count; i += step) {
     if (i <= kMaxInt8) {
-      uint8_t operand0 = Register(i).ToOperand();
+      uint32_t operand0 = Register(i).ToOperand();
       Register reg0 = Register::FromOperand(operand0);
       CHECK_EQ(i, reg0.index());
     }
 
-    uint16_t operand1 = Register(i).ToWideOperand();
-    Register reg1 = Register::FromWideOperand(operand1);
+    uint32_t operand1 = Register(i).ToOperand();
+    Register reg1 = Register::FromOperand(operand1);
     CHECK_EQ(i, reg1.index());
 
-    uint32_t operand2 = Register(i).ToRawOperand();
-    Register reg2 = Register::FromRawOperand(operand2);
+    uint32_t operand2 = Register(i).ToOperand();
+    Register reg2 = Register::FromOperand(operand2);
     CHECK_EQ(i, reg2.index());
   }
 
   for (int i = 0; i <= kMaxUInt8; i++) {
-    uint8_t operand = static_cast<uint8_t>(i);
-    Register reg = Register::FromOperand(operand);
-    if (i > 0 && i < -kMinInt8) {
+    Register reg = Register::FromOperand(i);
+    if (i > 0) {
       CHECK(reg.is_parameter());
     } else {
       CHECK(!reg.is_parameter());
@@ -51,7 +50,7 @@
     int parameter_count = parameter_counts[p];
     for (int i = 0; i < parameter_count; i++) {
       Register r = Register::FromParameterIndex(i, parameter_count);
-      uint8_t operand_value = r.ToOperand();
+      uint32_t operand_value = r.ToOperand();
       Register s = Register::FromOperand(operand_value);
       CHECK_EQ(i, s.ToParameterIndex(parameter_count));
     }
@@ -59,8 +58,8 @@
 }
 
 TEST(OperandConversion, RegistersParametersNoOverlap) {
-  int register_count = Register::MaxRegisterIndex() + 1;
-  int parameter_count = Register::MaxParameterIndex() + 1;
+  int register_count = 128;
+  int parameter_count = 100;
   int32_t register_space_size = base::bits::RoundUpToPowerOfTwo32(
       static_cast<uint32_t>(register_count + parameter_count));
   uint32_t range = static_cast<uint32_t>(register_space_size);
@@ -68,18 +67,33 @@
 
   for (int i = 0; i < register_count; i += 1) {
     Register r = Register(i);
-    uint32_t operand = r.ToWideOperand();
-    CHECK_LT(operand, operand_count.size());
-    operand_count[operand] += 1;
-    CHECK_EQ(operand_count[operand], 1);
+    int32_t operand = r.ToOperand();
+    uint8_t index = static_cast<uint8_t>(operand);
+    CHECK_LT(index, operand_count.size());
+    operand_count[index] += 1;
+    CHECK_EQ(operand_count[index], 1);
   }
 
   for (int i = 0; i < parameter_count; i += 1) {
     Register r = Register::FromParameterIndex(i, parameter_count);
-    uint32_t operand = r.ToWideOperand();
-    CHECK_LT(operand, operand_count.size());
-    operand_count[operand] += 1;
-    CHECK_EQ(operand_count[operand], 1);
+    uint32_t operand = r.ToOperand();
+    uint8_t index = static_cast<uint8_t>(operand);
+    CHECK_LT(index, operand_count.size());
+    operand_count[index] += 1;
+    CHECK_EQ(operand_count[index], 1);
+  }
+}
+
+TEST(OperandScaling, ScalableAndNonScalable) {
+  for (OperandScale operand_scale = OperandScale::kSingle;
+       operand_scale <= OperandScale::kMaxValid;
+       operand_scale = Bytecodes::NextOperandScale(operand_scale)) {
+    int scale = static_cast<int>(operand_scale);
+    CHECK_EQ(Bytecodes::Size(Bytecode::kCallRuntime, operand_scale),
+             1 + 2 + 2 * scale);
+    CHECK_EQ(Bytecodes::Size(Bytecode::kCreateObjectLiteral, operand_scale),
+             1 + 2 * scale + 1);
+    CHECK_EQ(Bytecodes::Size(Bytecode::kTestIn, operand_scale), 1 + scale);
   }
 }
 
@@ -87,16 +101,11 @@
   CHECK_EQ(Bytecodes::NumberOfRegisterOperands(Bytecode::kAdd), 1);
   CHECK_EQ(Bytecodes::NumberOfRegisterOperands(Bytecode::kCall), 2);
   CHECK_EQ(Bytecodes::NumberOfRegisterOperands(Bytecode::kCallRuntime), 1);
-  CHECK_EQ(Bytecodes::NumberOfRegisterOperands(Bytecode::kCallRuntimeWide), 1);
   CHECK_EQ(Bytecodes::NumberOfRegisterOperands(Bytecode::kCallRuntimeForPair),
            2);
-  CHECK_EQ(
-      Bytecodes::NumberOfRegisterOperands(Bytecode::kCallRuntimeForPairWide),
-      2);
   CHECK_EQ(Bytecodes::NumberOfRegisterOperands(Bytecode::kDeletePropertyStrict),
            1);
   CHECK_EQ(Bytecodes::NumberOfRegisterOperands(Bytecode::kForInPrepare), 1);
-  CHECK_EQ(Bytecodes::NumberOfRegisterOperands(Bytecode::kForInPrepareWide), 1);
   CHECK_EQ(Bytecodes::NumberOfRegisterOperands(Bytecode::kInc), 0);
   CHECK_EQ(Bytecodes::NumberOfRegisterOperands(Bytecode::kJumpIfTrue), 0);
   CHECK_EQ(Bytecodes::NumberOfRegisterOperands(Bytecode::kNew), 2);
@@ -116,11 +125,11 @@
 }
 
 TEST(Bytecodes, RegisterOperands) {
-  CHECK(Bytecodes::IsRegisterOperandType(OperandType::kReg8));
-  CHECK(Bytecodes::IsRegisterInputOperandType(OperandType::kReg8));
-  CHECK(!Bytecodes::IsRegisterOutputOperandType(OperandType::kReg8));
-  CHECK(!Bytecodes::IsRegisterInputOperandType(OperandType::kRegOut8));
-  CHECK(Bytecodes::IsRegisterOutputOperandType(OperandType::kRegOut8));
+  CHECK(Bytecodes::IsRegisterOperandType(OperandType::kReg));
+  CHECK(Bytecodes::IsRegisterInputOperandType(OperandType::kReg));
+  CHECK(!Bytecodes::IsRegisterOutputOperandType(OperandType::kReg));
+  CHECK(!Bytecodes::IsRegisterInputOperandType(OperandType::kRegOut));
+  CHECK(Bytecodes::IsRegisterOutputOperandType(OperandType::kRegOut));
 
 #define IS_REGISTER_OPERAND_TYPE(Name, _) \
   CHECK(Bytecodes::IsRegisterOperandType(OperandType::k##Name));
@@ -155,16 +164,155 @@
 #undef IS_NOT_REGISTER_INPUT_OPERAND_TYPE
 }
 
-TEST(Bytecodes, DebugBreak) {
-  for (uint32_t i = 0; i < Bytecodes::ToByte(Bytecode::kLast); i++) {
-    Bytecode bytecode = Bytecodes::FromByte(i);
-    Bytecode debugbreak = Bytecodes::GetDebugBreak(bytecode);
-    if (!Bytecodes::IsDebugBreak(debugbreak)) {
-      PrintF("Bytecode %s has no matching debug break with length %d\n",
-             Bytecodes::ToString(bytecode), Bytecodes::Size(bytecode));
-      CHECK(false);
-    }
+TEST(Bytecodes, DebugBreakExistForEachBytecode) {
+  static const OperandScale kOperandScale = OperandScale::kSingle;
+#define CHECK_DEBUG_BREAK_SIZE(Name, ...)                                  \
+  if (!Bytecodes::IsDebugBreak(Bytecode::k##Name) &&                       \
+      !Bytecodes::IsPrefixScalingBytecode(Bytecode::k##Name)) {            \
+    Bytecode debug_bytecode = Bytecodes::GetDebugBreak(Bytecode::k##Name); \
+    CHECK_EQ(Bytecodes::Size(Bytecode::k##Name, kOperandScale),            \
+             Bytecodes::Size(debug_bytecode, kOperandScale));              \
   }
+  BYTECODE_LIST(CHECK_DEBUG_BREAK_SIZE)
+#undef CHECK_DEBUG_BREAK_SIZE
+}
+
+TEST(Bytecodes, DecodeBytecodeAndOperands) {
+  struct BytecodesAndResult {
+    const uint8_t bytecode[32];
+    const size_t length;
+    int parameter_count;
+    const char* output;
+  };
+
+#define B(Name) static_cast<uint8_t>(Bytecode::k##Name)
+  const BytecodesAndResult cases[] = {
+      {{B(LdaSmi), 0x01}, 2, 0, "            LdaSmi [1]"},
+      {{B(Wide), B(LdaSmi), 0xe8, 0x03}, 4, 0, "      LdaSmi.Wide [1000]"},
+      {{B(ExtraWide), B(LdaSmi), 0xa0, 0x86, 0x01, 0x00},
+       6,
+       0,
+       "LdaSmi.ExtraWide [100000]"},
+      {{B(LdaSmi), 0xff}, 2, 0, "            LdaSmi [-1]"},
+      {{B(Wide), B(LdaSmi), 0x18, 0xfc}, 4, 0, "      LdaSmi.Wide [-1000]"},
+      {{B(ExtraWide), B(LdaSmi), 0x60, 0x79, 0xfe, 0xff},
+       6,
+       0,
+       "LdaSmi.ExtraWide [-100000]"},
+      {{B(Star), 0xfb}, 2, 0, "            Star r5"},
+      {{B(Wide), B(Star), 0x78, 0xff}, 4, 0, "      Star.Wide r136"},
+      {{B(Wide), B(Call), 0x7a, 0xff, 0x79, 0xff, 0x02, 0x00, 0xb1, 0x00},
+       10,
+       0,
+       "Call.Wide r134, r135, #2, [177]"},
+      {{B(Ldar),
+        static_cast<uint8_t>(Register::FromParameterIndex(2, 3).ToOperand())},
+       2,
+       3,
+       "            Ldar a1"},
+      {{B(Wide), B(CreateObjectLiteral), 0x01, 0x02, 0x03, 0x04, 0xa5},
+       7,
+       0,
+       "CreateObjectLiteral.Wide [513], [1027], #165"},
+      {{B(ExtraWide), B(JumpIfNull), 0x15, 0xcd, 0x5b, 0x07},
+       6,
+       0,
+       "JumpIfNull.ExtraWide [123456789]"},
+  };
+#undef B
+
+  for (size_t i = 0; i < arraysize(cases); ++i) {
+    // Generate reference string by prepending formatted bytes.
+    std::stringstream expected_ss;
+    std::ios default_format(nullptr);
+    default_format.copyfmt(expected_ss);
+    // Match format of Bytecodes::Decode() for byte representations.
+    expected_ss.fill('0');
+    expected_ss.flags(std::ios::right | std::ios::hex);
+    for (size_t b = 0; b < cases[i].length; b++) {
+      expected_ss << std::setw(2) << static_cast<uint32_t>(cases[i].bytecode[b])
+                  << ' ';
+    }
+    expected_ss.copyfmt(default_format);
+    expected_ss << cases[i].output;
+
+    // Generate decoded byte output.
+    std::stringstream actual_ss;
+    Bytecodes::Decode(actual_ss, cases[i].bytecode, cases[i].parameter_count);
+
+    // Compare.
+    CHECK_EQ(actual_ss.str(), expected_ss.str());
+  }
+}
+
+TEST(Bytecodes, DebugBreakForPrefixBytecodes) {
+  CHECK_EQ(Bytecode::kDebugBreakWide,
+           Bytecodes::GetDebugBreak(Bytecode::kWide));
+  CHECK_EQ(Bytecode::kDebugBreakExtraWide,
+           Bytecodes::GetDebugBreak(Bytecode::kExtraWide));
+}
+
+TEST(Bytecodes, PrefixMappings) {
+  Bytecode prefixes[] = {Bytecode::kWide, Bytecode::kExtraWide};
+  TRACED_FOREACH(Bytecode, prefix, prefixes) {
+    CHECK_EQ(prefix, Bytecodes::OperandScaleToPrefixBytecode(
+                         Bytecodes::PrefixBytecodeToOperandScale(prefix)));
+  }
+}
+
+TEST(OperandScale, PrefixesScale) {
+  CHECK(Bytecodes::NextOperandScale(OperandScale::kSingle) ==
+        OperandScale::kDouble);
+  CHECK(Bytecodes::NextOperandScale(OperandScale::kDouble) ==
+        OperandScale::kQuadruple);
+  CHECK(Bytecodes::NextOperandScale(OperandScale::kQuadruple) ==
+        OperandScale::kInvalid);
+}
+
+TEST(OperandScale, PrefixesRequired) {
+  CHECK(!Bytecodes::OperandScaleRequiresPrefixBytecode(OperandScale::kSingle));
+  CHECK(Bytecodes::OperandScaleRequiresPrefixBytecode(OperandScale::kDouble));
+  CHECK(
+      Bytecodes::OperandScaleRequiresPrefixBytecode(OperandScale::kQuadruple));
+  CHECK(Bytecodes::OperandScaleToPrefixBytecode(OperandScale::kDouble) ==
+        Bytecode::kWide);
+  CHECK(Bytecodes::OperandScaleToPrefixBytecode(OperandScale::kQuadruple) ==
+        Bytecode::kExtraWide);
+}
+
+TEST(AccumulatorUse, LogicalOperators) {
+  CHECK_EQ(AccumulatorUse::kNone | AccumulatorUse::kRead,
+           AccumulatorUse::kRead);
+  CHECK_EQ(AccumulatorUse::kRead | AccumulatorUse::kWrite,
+           AccumulatorUse::kReadWrite);
+  CHECK_EQ(AccumulatorUse::kRead & AccumulatorUse::kReadWrite,
+           AccumulatorUse::kRead);
+  CHECK_EQ(AccumulatorUse::kRead & AccumulatorUse::kWrite,
+           AccumulatorUse::kNone);
+}
+
+TEST(AccumulatorUse, SampleBytecodes) {
+  CHECK(Bytecodes::ReadsAccumulator(Bytecode::kStar));
+  CHECK(!Bytecodes::WritesAccumulator(Bytecode::kStar));
+  CHECK_EQ(Bytecodes::GetAccumulatorUse(Bytecode::kStar),
+           AccumulatorUse::kRead);
+  CHECK(!Bytecodes::ReadsAccumulator(Bytecode::kLdar));
+  CHECK(Bytecodes::WritesAccumulator(Bytecode::kLdar));
+  CHECK_EQ(Bytecodes::GetAccumulatorUse(Bytecode::kLdar),
+           AccumulatorUse::kWrite);
+  CHECK(Bytecodes::ReadsAccumulator(Bytecode::kAdd));
+  CHECK(Bytecodes::WritesAccumulator(Bytecode::kAdd));
+  CHECK_EQ(Bytecodes::GetAccumulatorUse(Bytecode::kAdd),
+           AccumulatorUse::kReadWrite);
+}
+
+TEST(AccumulatorUse, AccumulatorUseToString) {
+  std::set<std::string> names;
+  names.insert(Bytecodes::AccumulatorUseToString(AccumulatorUse::kNone));
+  names.insert(Bytecodes::AccumulatorUseToString(AccumulatorUse::kRead));
+  names.insert(Bytecodes::AccumulatorUseToString(AccumulatorUse::kWrite));
+  names.insert(Bytecodes::AccumulatorUseToString(AccumulatorUse::kReadWrite));
+  CHECK_EQ(names.size(), 4);
 }
 
 }  // namespace interpreter
diff --git a/test/unittests/interpreter/constant-array-builder-unittest.cc b/test/unittests/interpreter/constant-array-builder-unittest.cc
index b3ec5ff..7122437 100644
--- a/test/unittests/interpreter/constant-array-builder-unittest.cc
+++ b/test/unittests/interpreter/constant-array-builder-unittest.cc
@@ -19,79 +19,76 @@
   ConstantArrayBuilderTest() {}
   ~ConstantArrayBuilderTest() override {}
 
-  static const size_t kLowCapacity = ConstantArrayBuilder::kLowCapacity;
-  static const size_t kMaxCapacity = ConstantArrayBuilder::kMaxCapacity;
+  static const size_t k8BitCapacity = ConstantArrayBuilder::k8BitCapacity;
+  static const size_t k16BitCapacity = ConstantArrayBuilder::k16BitCapacity;
 };
 
-
 STATIC_CONST_MEMBER_DEFINITION const size_t
-    ConstantArrayBuilderTest::kMaxCapacity;
+    ConstantArrayBuilderTest::k16BitCapacity;
 STATIC_CONST_MEMBER_DEFINITION const size_t
-    ConstantArrayBuilderTest::kLowCapacity;
-
+    ConstantArrayBuilderTest::k8BitCapacity;
 
 TEST_F(ConstantArrayBuilderTest, AllocateAllEntries) {
   ConstantArrayBuilder builder(isolate(), zone());
-  for (size_t i = 0; i < kMaxCapacity; i++) {
+  for (size_t i = 0; i < k16BitCapacity; i++) {
     builder.Insert(handle(Smi::FromInt(static_cast<int>(i)), isolate()));
   }
-  CHECK_EQ(builder.size(), kMaxCapacity);
-  for (size_t i = 0; i < kMaxCapacity; i++) {
+  CHECK_EQ(builder.size(), k16BitCapacity);
+  for (size_t i = 0; i < k16BitCapacity; i++) {
     CHECK_EQ(Handle<Smi>::cast(builder.At(i))->value(), i);
   }
 }
 
-
 TEST_F(ConstantArrayBuilderTest, AllocateEntriesWithIdx8Reservations) {
-  for (size_t reserved = 1; reserved < kLowCapacity; reserved *= 3) {
+  for (size_t reserved = 1; reserved < k8BitCapacity; reserved *= 3) {
     ConstantArrayBuilder builder(isolate(), zone());
     for (size_t i = 0; i < reserved; i++) {
       OperandSize operand_size = builder.CreateReservedEntry();
       CHECK(operand_size == OperandSize::kByte);
     }
-    for (size_t i = 0; i < 2 * kLowCapacity; i++) {
+    for (size_t i = 0; i < 2 * k8BitCapacity; i++) {
       Handle<Object> object = isolate()->factory()->NewNumberFromSize(i);
       builder.Insert(object);
-      if (i + reserved < kLowCapacity) {
-        CHECK_LE(builder.size(), kLowCapacity);
+      if (i + reserved < k8BitCapacity) {
+        CHECK_LE(builder.size(), k8BitCapacity);
         CHECK_EQ(builder.size(), i + 1);
         CHECK(builder.At(i)->SameValue(*object));
       } else {
-        CHECK_GE(builder.size(), kLowCapacity);
+        CHECK_GE(builder.size(), k8BitCapacity);
         CHECK_EQ(builder.size(), i + reserved + 1);
         CHECK(builder.At(i + reserved)->SameValue(*object));
       }
     }
-    CHECK_EQ(builder.size(), 2 * kLowCapacity + reserved);
+    CHECK_EQ(builder.size(), 2 * k8BitCapacity + reserved);
 
     // Check reserved values represented by the hole.
     for (size_t i = 0; i < reserved; i++) {
-      Handle<Object> empty = builder.At(kLowCapacity - reserved + i);
+      Handle<Object> empty = builder.At(k8BitCapacity - reserved + i);
       CHECK(empty->SameValue(isolate()->heap()->the_hole_value()));
     }
 
     // Commmit reserved entries with duplicates and check size does not change.
-    DCHECK_EQ(reserved + 2 * kLowCapacity, builder.size());
+    DCHECK_EQ(reserved + 2 * k8BitCapacity, builder.size());
     size_t duplicates_in_idx8_space =
-        std::min(reserved, kLowCapacity - reserved);
+        std::min(reserved, k8BitCapacity - reserved);
     for (size_t i = 0; i < duplicates_in_idx8_space; i++) {
       builder.CommitReservedEntry(OperandSize::kByte,
                                   isolate()->factory()->NewNumberFromSize(i));
-      DCHECK_EQ(reserved + 2 * kLowCapacity, builder.size());
+      DCHECK_EQ(reserved + 2 * k8BitCapacity, builder.size());
     }
 
     // Check all committed values match expected (holes where
     // duplicates_in_idx8_space allocated).
-    for (size_t i = 0; i < kLowCapacity - reserved; i++) {
+    for (size_t i = 0; i < k8BitCapacity - reserved; i++) {
       Smi* smi = Smi::FromInt(static_cast<int>(i));
       CHECK(Handle<Smi>::cast(builder.At(i))->SameValue(smi));
     }
-    for (size_t i = kLowCapacity; i < 2 * kLowCapacity + reserved; i++) {
+    for (size_t i = k8BitCapacity; i < 2 * k8BitCapacity + reserved; i++) {
       Smi* smi = Smi::FromInt(static_cast<int>(i - reserved));
       CHECK(Handle<Smi>::cast(builder.At(i))->SameValue(smi));
     }
     for (size_t i = 0; i < reserved; i++) {
-      size_t index = kLowCapacity - reserved + i;
+      size_t index = k8BitCapacity - reserved + i;
       CHECK(builder.At(index)->IsTheHole());
     }
 
@@ -102,20 +99,19 @@
     }
     for (size_t i = 0; i < duplicates_in_idx8_space; i++) {
       Handle<Object> object =
-          isolate()->factory()->NewNumberFromSize(2 * kLowCapacity + i);
+          isolate()->factory()->NewNumberFromSize(2 * k8BitCapacity + i);
       size_t index = builder.CommitReservedEntry(OperandSize::kByte, object);
-      CHECK_EQ(static_cast<int>(index), kLowCapacity - reserved + i);
+      CHECK_EQ(static_cast<int>(index), k8BitCapacity - reserved + i);
       CHECK(builder.At(static_cast<int>(index))->SameValue(*object));
     }
-    CHECK_EQ(builder.size(), 2 * kLowCapacity + reserved);
+    CHECK_EQ(builder.size(), 2 * k8BitCapacity + reserved);
   }
 }
 
-
-TEST_F(ConstantArrayBuilderTest, AllocateEntriesWithIdx16Reservations) {
-  for (size_t reserved = 1; reserved < kLowCapacity; reserved *= 3) {
+TEST_F(ConstantArrayBuilderTest, AllocateEntriesWithWideReservations) {
+  for (size_t reserved = 1; reserved < k8BitCapacity; reserved *= 3) {
     ConstantArrayBuilder builder(isolate(), zone());
-    for (size_t i = 0; i < kLowCapacity; i++) {
+    for (size_t i = 0; i < k8BitCapacity; i++) {
       Handle<Object> object = isolate()->factory()->NewNumberFromSize(i);
       builder.Insert(object);
       CHECK(builder.At(i)->SameValue(*object));
@@ -124,20 +120,20 @@
     for (size_t i = 0; i < reserved; i++) {
       OperandSize operand_size = builder.CreateReservedEntry();
       CHECK(operand_size == OperandSize::kShort);
-      CHECK_EQ(builder.size(), kLowCapacity);
+      CHECK_EQ(builder.size(), k8BitCapacity);
     }
     for (size_t i = 0; i < reserved; i++) {
       builder.DiscardReservedEntry(OperandSize::kShort);
-      CHECK_EQ(builder.size(), kLowCapacity);
+      CHECK_EQ(builder.size(), k8BitCapacity);
     }
     for (size_t i = 0; i < reserved; i++) {
       OperandSize operand_size = builder.CreateReservedEntry();
       CHECK(operand_size == OperandSize::kShort);
       Handle<Object> object = isolate()->factory()->NewNumberFromSize(i);
       builder.CommitReservedEntry(operand_size, object);
-      CHECK_EQ(builder.size(), kLowCapacity);
+      CHECK_EQ(builder.size(), k8BitCapacity);
     }
-    for (size_t i = kLowCapacity; i < kLowCapacity + reserved; i++) {
+    for (size_t i = k8BitCapacity; i < k8BitCapacity + reserved; i++) {
       OperandSize operand_size = builder.CreateReservedEntry();
       CHECK(operand_size == OperandSize::kShort);
       Handle<Object> object = isolate()->factory()->NewNumberFromSize(i);
@@ -163,26 +159,40 @@
   }
 }
 
+TEST_F(ConstantArrayBuilderTest, ToLargeFixedArray) {
+  ConstantArrayBuilder builder(isolate(), zone());
+  static const size_t kNumberOfElements = 37373;
+  for (size_t i = 0; i < kNumberOfElements; i++) {
+    Handle<Object> object = isolate()->factory()->NewNumberFromSize(i);
+    builder.Insert(object);
+    CHECK(builder.At(i)->SameValue(*object));
+  }
+  Handle<FixedArray> constant_array = builder.ToFixedArray();
+  CHECK_EQ(constant_array->length(), kNumberOfElements);
+  for (size_t i = 0; i < kNumberOfElements; i++) {
+    CHECK(constant_array->get(static_cast<int>(i))->SameValue(*builder.At(i)));
+  }
+}
 
 TEST_F(ConstantArrayBuilderTest, GapFilledWhenLowReservationCommitted) {
   ConstantArrayBuilder builder(isolate(), zone());
-  for (size_t i = 0; i < kLowCapacity; i++) {
+  for (size_t i = 0; i < k8BitCapacity; i++) {
     OperandSize operand_size = builder.CreateReservedEntry();
     CHECK(OperandSize::kByte == operand_size);
     CHECK_EQ(builder.size(), 0);
   }
-  for (size_t i = 0; i < kLowCapacity; i++) {
+  for (size_t i = 0; i < k8BitCapacity; i++) {
     Handle<Object> object = isolate()->factory()->NewNumberFromSize(i);
     builder.Insert(object);
-    CHECK_EQ(builder.size(), i + kLowCapacity + 1);
+    CHECK_EQ(builder.size(), i + k8BitCapacity + 1);
   }
-  for (size_t i = 0; i < kLowCapacity; i++) {
+  for (size_t i = 0; i < k8BitCapacity; i++) {
     builder.CommitReservedEntry(OperandSize::kByte,
-                                builder.At(i + kLowCapacity));
-    CHECK_EQ(builder.size(), 2 * kLowCapacity);
+                                builder.At(i + k8BitCapacity));
+    CHECK_EQ(builder.size(), 2 * k8BitCapacity);
   }
-  for (size_t i = 0; i < kLowCapacity; i++) {
-    Handle<Object> original = builder.At(kLowCapacity + i);
+  for (size_t i = 0; i < k8BitCapacity; i++) {
+    Handle<Object> original = builder.At(k8BitCapacity + i);
     Handle<Object> duplicate = builder.At(i);
     CHECK(original->SameValue(*duplicate));
     Handle<Object> reference = isolate()->factory()->NewNumberFromSize(i);
@@ -190,33 +200,89 @@
   }
 }
 
-
 TEST_F(ConstantArrayBuilderTest, GapNotFilledWhenLowReservationDiscarded) {
   ConstantArrayBuilder builder(isolate(), zone());
-  for (size_t i = 0; i < kLowCapacity; i++) {
+  for (size_t i = 0; i < k8BitCapacity; i++) {
     OperandSize operand_size = builder.CreateReservedEntry();
     CHECK(OperandSize::kByte == operand_size);
     CHECK_EQ(builder.size(), 0);
   }
-  for (size_t i = 0; i < kLowCapacity; i++) {
+  for (size_t i = 0; i < k8BitCapacity; i++) {
     Handle<Object> object = isolate()->factory()->NewNumberFromSize(i);
     builder.Insert(object);
-    CHECK_EQ(builder.size(), i + kLowCapacity + 1);
+    CHECK_EQ(builder.size(), i + k8BitCapacity + 1);
   }
-  for (size_t i = 0; i < kLowCapacity; i++) {
+  for (size_t i = 0; i < k8BitCapacity; i++) {
     builder.DiscardReservedEntry(OperandSize::kByte);
-    builder.Insert(builder.At(i + kLowCapacity));
-    CHECK_EQ(builder.size(), 2 * kLowCapacity);
+    builder.Insert(builder.At(i + k8BitCapacity));
+    CHECK_EQ(builder.size(), 2 * k8BitCapacity);
   }
-  for (size_t i = 0; i < kLowCapacity; i++) {
+  for (size_t i = 0; i < k8BitCapacity; i++) {
     Handle<Object> reference = isolate()->factory()->NewNumberFromSize(i);
-    Handle<Object> original = builder.At(kLowCapacity + i);
+    Handle<Object> original = builder.At(k8BitCapacity + i);
     CHECK(original->SameValue(*reference));
     Handle<Object> duplicate = builder.At(i);
     CHECK(duplicate->SameValue(*isolate()->factory()->the_hole_value()));
   }
 }
 
+TEST_F(ConstantArrayBuilderTest, HolesWithUnusedReservations) {
+  static int kNumberOfHoles = 128;
+  ConstantArrayBuilder builder(isolate(), zone());
+  for (int i = 0; i < kNumberOfHoles; ++i) {
+    CHECK_EQ(builder.CreateReservedEntry(), OperandSize::kByte);
+  }
+  for (int i = 0; i < 128; ++i) {
+    CHECK_EQ(builder.Insert(isolate()->factory()->NewNumber(i)), i);
+  }
+  CHECK_EQ(builder.Insert(isolate()->factory()->NewNumber(256)), 256);
+
+  Handle<FixedArray> constant_array = builder.ToFixedArray();
+  CHECK_EQ(constant_array->length(), 257);
+  for (int i = 128; i < 256; i++) {
+    CHECK(constant_array->get(i)->SameValue(
+        *isolate()->factory()->the_hole_value()));
+  }
+  CHECK(!constant_array->get(127)->SameValue(
+      *isolate()->factory()->the_hole_value()));
+  CHECK(!constant_array->get(256)->SameValue(
+      *isolate()->factory()->the_hole_value()));
+}
+
+TEST_F(ConstantArrayBuilderTest, ReservationsAtAllScales) {
+  ConstantArrayBuilder builder(isolate(), zone());
+  for (int i = 0; i < 256; i++) {
+    CHECK_EQ(builder.CreateReservedEntry(), OperandSize::kByte);
+  }
+  for (int i = 256; i < 65536; ++i) {
+    CHECK_EQ(builder.CreateReservedEntry(), OperandSize::kShort);
+  }
+  for (int i = 65536; i < 131072; ++i) {
+    CHECK_EQ(builder.CreateReservedEntry(), OperandSize::kQuad);
+  }
+  CHECK_EQ(builder.CommitReservedEntry(OperandSize::kByte,
+                                       isolate()->factory()->NewNumber(1)),
+           0);
+  CHECK_EQ(builder.CommitReservedEntry(OperandSize::kShort,
+                                       isolate()->factory()->NewNumber(2)),
+           256);
+  CHECK_EQ(builder.CommitReservedEntry(OperandSize::kQuad,
+                                       isolate()->factory()->NewNumber(3)),
+           65536);
+  Handle<FixedArray> constant_array = builder.ToFixedArray();
+  CHECK_EQ(constant_array->length(), 65537);
+  int count = 1;
+  for (int i = 0; i < constant_array->length(); ++i) {
+    Handle<Object> expected;
+    if (i == 0 || i == 256 || i == 65536) {
+      expected = isolate()->factory()->NewNumber(count++);
+    } else {
+      expected = isolate()->factory()->the_hole_value();
+    }
+    CHECK(constant_array->get(i)->SameValue(*expected));
+  }
+}
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
diff --git a/test/unittests/interpreter/interpreter-assembler-unittest.cc b/test/unittests/interpreter/interpreter-assembler-unittest.cc
index 3375a6b..0106c57 100644
--- a/test/unittests/interpreter/interpreter-assembler-unittest.cc
+++ b/test/unittests/interpreter/interpreter-assembler-unittest.cc
@@ -62,6 +62,18 @@
                            : IsWord32Or(lhs_matcher, rhs_matcher);
 }
 
+InterpreterAssemblerTest::InterpreterAssemblerForTest::
+    ~InterpreterAssemblerForTest() {
+  // Tests don't necessarily read and write accumulator but
+  // InterpreterAssembler checks accumulator uses.
+  if (Bytecodes::ReadsAccumulator(bytecode())) {
+    GetAccumulator();
+  }
+  if (Bytecodes::WritesAccumulator(bytecode())) {
+    SetAccumulator(nullptr);
+  }
+}
+
 Matcher<Node*> InterpreterAssemblerTest::InterpreterAssemblerForTest::IsLoad(
     const Matcher<LoadRepresentation>& rep_matcher,
     const Matcher<Node*>& base_matcher, const Matcher<Node*>& index_matcher) {
@@ -77,24 +89,25 @@
 }
 
 Matcher<Node*>
-InterpreterAssemblerTest::InterpreterAssemblerForTest::IsBytecodeOperand(
+InterpreterAssemblerTest::InterpreterAssemblerForTest::IsUnsignedByteOperand(
     int offset) {
   return IsLoad(
       MachineType::Uint8(),
       IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
       IsIntPtrAdd(
           IsParameter(InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
-          IsInt32Constant(offset)));
+          IsIntPtrConstant(offset)));
 }
 
-Matcher<Node*> InterpreterAssemblerTest::InterpreterAssemblerForTest::
-    IsBytecodeOperandSignExtended(int offset) {
+Matcher<Node*>
+InterpreterAssemblerTest::InterpreterAssemblerForTest::IsSignedByteOperand(
+    int offset) {
   Matcher<Node*> load_matcher = IsLoad(
       MachineType::Int8(),
       IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
       IsIntPtrAdd(
           IsParameter(InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
-          IsInt32Constant(offset)));
+          IsIntPtrConstant(offset)));
   if (kPointerSize == 8) {
     load_matcher = IsChangeInt32ToInt64(load_matcher);
   }
@@ -102,7 +115,7 @@
 }
 
 Matcher<Node*>
-InterpreterAssemblerTest::InterpreterAssemblerForTest::IsBytecodeOperandShort(
+InterpreterAssemblerTest::InterpreterAssemblerForTest::IsUnsignedShortOperand(
     int offset) {
   if (TargetSupportsUnalignedAccess()) {
     return IsLoad(
@@ -111,36 +124,35 @@
         IsIntPtrAdd(
             IsParameter(
                 InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
-            IsInt32Constant(offset)));
+            IsIntPtrConstant(offset)));
   } else {
-    Matcher<Node*> first_byte = IsLoad(
-        MachineType::Uint8(),
-        IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
-        IsIntPtrAdd(
-            IsParameter(
-                InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
-            IsInt32Constant(offset)));
-    Matcher<Node*> second_byte = IsLoad(
-        MachineType::Uint8(),
-        IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
-        IsIntPtrAdd(
-            IsParameter(
-                InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
-            IsInt32Constant(offset + 1)));
 #if V8_TARGET_LITTLE_ENDIAN
-    return IsWordOr(IsWordShl(second_byte, IsInt32Constant(kBitsPerByte)),
-                    first_byte);
+    const int kStep = -1;
+    const int kMsbOffset = 1;
 #elif V8_TARGET_BIG_ENDIAN
-    return IsWordOr(IsWordShl(first_byte, IsInt32Constant(kBitsPerByte)),
-                    second_byte);
+    const int kStep = 1;
+    const int kMsbOffset = 0;
 #else
 #error "Unknown Architecture"
 #endif
+    Matcher<Node*> bytes[2];
+    for (int i = 0; i < static_cast<int>(arraysize(bytes)); i++) {
+      bytes[i] = IsLoad(
+          MachineType::Uint8(),
+          IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
+          IsIntPtrAdd(
+              IsParameter(
+                  InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
+              IsIntPtrConstant(offset + kMsbOffset + kStep * i)));
+    }
+    return IsWord32Or(IsWord32Shl(bytes[0], IsInt32Constant(kBitsPerByte)),
+                      bytes[1]);
   }
 }
 
-Matcher<Node*> InterpreterAssemblerTest::InterpreterAssemblerForTest::
-    IsBytecodeOperandShortSignExtended(int offset) {
+Matcher<Node*>
+InterpreterAssemblerTest::InterpreterAssemblerForTest::IsSignedShortOperand(
+    int offset) {
   Matcher<Node*> load_matcher;
   if (TargetSupportsUnalignedAccess()) {
     load_matcher = IsLoad(
@@ -149,34 +161,29 @@
         IsIntPtrAdd(
             IsParameter(
                 InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
-            IsInt32Constant(offset)));
+            IsIntPtrConstant(offset)));
   } else {
 #if V8_TARGET_LITTLE_ENDIAN
-    int hi_byte_offset = offset + 1;
-    int lo_byte_offset = offset;
-
+    const int kStep = -1;
+    const int kMsbOffset = 1;
 #elif V8_TARGET_BIG_ENDIAN
-    int hi_byte_offset = offset;
-    int lo_byte_offset = offset + 1;
+    const int kStep = 1;
+    const int kMsbOffset = 0;
 #else
 #error "Unknown Architecture"
 #endif
-    Matcher<Node*> hi_byte = IsLoad(
-        MachineType::Int8(),
-        IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
-        IsIntPtrAdd(
-            IsParameter(
-                InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
-            IsInt32Constant(hi_byte_offset)));
-    hi_byte = IsWord32Shl(hi_byte, IsInt32Constant(kBitsPerByte));
-    Matcher<Node*> lo_byte = IsLoad(
-        MachineType::Uint8(),
-        IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
-        IsIntPtrAdd(
-            IsParameter(
-                InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
-            IsInt32Constant(lo_byte_offset)));
-    load_matcher = IsWord32Or(hi_byte, lo_byte);
+    Matcher<Node*> bytes[2];
+    for (int i = 0; i < static_cast<int>(arraysize(bytes)); i++) {
+      bytes[i] = IsLoad(
+          (i == 0) ? MachineType::Int8() : MachineType::Uint8(),
+          IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
+          IsIntPtrAdd(
+              IsParameter(
+                  InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
+              IsIntPtrConstant(offset + kMsbOffset + kStep * i)));
+    }
+    load_matcher = IsWord32Or(
+        IsWord32Shl(bytes[0], IsInt32Constant(kBitsPerByte)), bytes[1]);
   }
 
   if (kPointerSize == 8) {
@@ -185,6 +192,124 @@
   return load_matcher;
 }
 
+Matcher<Node*>
+InterpreterAssemblerTest::InterpreterAssemblerForTest::IsUnsignedQuadOperand(
+    int offset) {
+  if (TargetSupportsUnalignedAccess()) {
+    return IsLoad(
+        MachineType::Uint32(),
+        IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
+        IsIntPtrAdd(
+            IsParameter(
+                InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
+            IsIntPtrConstant(offset)));
+  } else {
+#if V8_TARGET_LITTLE_ENDIAN
+    const int kStep = -1;
+    const int kMsbOffset = 3;
+#elif V8_TARGET_BIG_ENDIAN
+    const int kStep = 1;
+    const int kMsbOffset = 0;
+#else
+#error "Unknown Architecture"
+#endif
+    Matcher<Node*> bytes[4];
+    for (int i = 0; i < static_cast<int>(arraysize(bytes)); i++) {
+      bytes[i] = IsLoad(
+          MachineType::Uint8(),
+          IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
+          IsIntPtrAdd(
+              IsParameter(
+                  InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
+              IsIntPtrConstant(offset + kMsbOffset + kStep * i)));
+    }
+    return IsWord32Or(
+        IsWord32Shl(bytes[0], IsInt32Constant(3 * kBitsPerByte)),
+        IsWord32Or(
+            IsWord32Shl(bytes[1], IsInt32Constant(2 * kBitsPerByte)),
+            IsWord32Or(IsWord32Shl(bytes[2], IsInt32Constant(1 * kBitsPerByte)),
+                       bytes[3])));
+  }
+}
+
+Matcher<Node*>
+InterpreterAssemblerTest::InterpreterAssemblerForTest::IsSignedQuadOperand(
+    int offset) {
+  Matcher<Node*> load_matcher;
+  if (TargetSupportsUnalignedAccess()) {
+    load_matcher = IsLoad(
+        MachineType::Int32(),
+        IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
+        IsIntPtrAdd(
+            IsParameter(
+                InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
+            IsIntPtrConstant(offset)));
+  } else {
+#if V8_TARGET_LITTLE_ENDIAN
+    const int kStep = -1;
+    int kMsbOffset = 3;
+#elif V8_TARGET_BIG_ENDIAN
+    const int kStep = 1;
+    int kMsbOffset = 0;
+#else
+#error "Unknown Architecture"
+#endif
+    Matcher<Node*> bytes[4];
+    for (int i = 0; i < static_cast<int>(arraysize(bytes)); i++) {
+      bytes[i] = IsLoad(
+          (i == 0) ? MachineType::Int8() : MachineType::Uint8(),
+          IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
+          IsIntPtrAdd(
+              IsParameter(
+                  InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
+              IsIntPtrConstant(offset + kMsbOffset + kStep * i)));
+    }
+    load_matcher = IsWord32Or(
+        IsWord32Shl(bytes[0], IsInt32Constant(3 * kBitsPerByte)),
+        IsWord32Or(
+            IsWord32Shl(bytes[1], IsInt32Constant(2 * kBitsPerByte)),
+            IsWord32Or(IsWord32Shl(bytes[2], IsInt32Constant(1 * kBitsPerByte)),
+                       bytes[3])));
+  }
+
+  if (kPointerSize == 8) {
+    load_matcher = IsChangeInt32ToInt64(load_matcher);
+  }
+  return load_matcher;
+}
+
+Matcher<Node*>
+InterpreterAssemblerTest::InterpreterAssemblerForTest::IsSignedOperand(
+    int offset, OperandSize operand_size) {
+  switch (operand_size) {
+    case OperandSize::kByte:
+      return IsSignedByteOperand(offset);
+    case OperandSize::kShort:
+      return IsSignedShortOperand(offset);
+    case OperandSize::kQuad:
+      return IsSignedQuadOperand(offset);
+    case OperandSize::kNone:
+      UNREACHABLE();
+  }
+  return nullptr;
+}
+
+Matcher<Node*>
+InterpreterAssemblerTest::InterpreterAssemblerForTest::IsUnsignedOperand(
+    int offset, OperandSize operand_size) {
+  switch (operand_size) {
+    case OperandSize::kByte:
+      return IsUnsignedByteOperand(offset);
+    case OperandSize::kShort:
+      return IsUnsignedShortOperand(offset);
+    case OperandSize::kQuad:
+      return IsUnsignedQuadOperand(offset);
+    case OperandSize::kNone:
+      UNREACHABLE();
+  }
+  return nullptr;
+}
+
 TARGET_TEST_F(InterpreterAssemblerTest, Dispatch) {
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);
@@ -195,18 +320,22 @@
     EXPECT_EQ(1, end->InputCount());
     Node* tail_call_node = end->InputAt(0);
 
+    OperandScale operand_scale = OperandScale::kSingle;
     Matcher<Node*> next_bytecode_offset_matcher = IsIntPtrAdd(
         IsParameter(InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
-        IsInt32Constant(interpreter::Bytecodes::Size(bytecode)));
+        IsIntPtrConstant(
+            interpreter::Bytecodes::Size(bytecode, operand_scale)));
     Matcher<Node*> target_bytecode_matcher = m.IsLoad(
         MachineType::Uint8(),
         IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
         next_bytecode_offset_matcher);
+    if (kPointerSize == 8) {
+      target_bytecode_matcher = IsChangeUint32ToUint64(target_bytecode_matcher);
+    }
     Matcher<Node*> code_target_matcher = m.IsLoad(
         MachineType::Pointer(),
         IsParameter(InterpreterDispatchDescriptor::kDispatchTableParameter),
-        IsWord32Shl(target_bytecode_matcher,
-                    IsInt32Constant(kPointerSizeLog2)));
+        IsWordShl(target_bytecode_matcher, IsIntPtrConstant(kPointerSizeLog2)));
 
     EXPECT_THAT(
         tail_call_node,
@@ -230,7 +359,7 @@
   TRACED_FOREACH(int, jump_offset, jump_offsets) {
     TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
       InterpreterAssemblerForTest m(this, bytecode);
-      m.Jump(m.Int32Constant(jump_offset));
+      m.Jump(m.IntPtrConstant(jump_offset));
       Graph* graph = m.graph();
       Node* end = graph->end();
       EXPECT_EQ(1, end->InputCount());
@@ -238,14 +367,18 @@
 
       Matcher<Node*> next_bytecode_offset_matcher = IsIntPtrAdd(
           IsParameter(InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
-          IsInt32Constant(jump_offset));
+          IsIntPtrConstant(jump_offset));
       Matcher<Node*> target_bytecode_matcher =
           m.IsLoad(MachineType::Uint8(), _, next_bytecode_offset_matcher);
+      if (kPointerSize == 8) {
+        target_bytecode_matcher =
+            IsChangeUint32ToUint64(target_bytecode_matcher);
+      }
       Matcher<Node*> code_target_matcher = m.IsLoad(
           MachineType::Pointer(),
           IsParameter(InterpreterDispatchDescriptor::kDispatchTableParameter),
-          IsWord32Shl(target_bytecode_matcher,
-                      IsInt32Constant(kPointerSizeLog2)));
+          IsWordShl(target_bytecode_matcher,
+                    IsIntPtrConstant(kPointerSizeLog2)));
 
       EXPECT_THAT(
           tail_call_node,
@@ -275,24 +408,29 @@
     InterpreterAssemblerForTest m(this, bytecode);
     Node* lhs = m.IntPtrConstant(0);
     Node* rhs = m.IntPtrConstant(1);
-    m.JumpIfWordEqual(lhs, rhs, m.Int32Constant(kJumpIfTrueOffset));
+    m.JumpIfWordEqual(lhs, rhs, m.IntPtrConstant(kJumpIfTrueOffset));
     Graph* graph = m.graph();
     Node* end = graph->end();
     EXPECT_EQ(2, end->InputCount());
 
-    int jump_offsets[] = {kJumpIfTrueOffset,
-                          interpreter::Bytecodes::Size(bytecode)};
+    OperandScale operand_scale = OperandScale::kSingle;
+    int jump_offsets[] = {kJumpIfTrueOffset, interpreter::Bytecodes::Size(
+                                                 bytecode, operand_scale)};
     for (int i = 0; i < static_cast<int>(arraysize(jump_offsets)); i++) {
       Matcher<Node*> next_bytecode_offset_matcher = IsIntPtrAdd(
           IsParameter(InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
-          IsInt32Constant(jump_offsets[i]));
+          IsIntPtrConstant(jump_offsets[i]));
       Matcher<Node*> target_bytecode_matcher =
           m.IsLoad(MachineType::Uint8(), _, next_bytecode_offset_matcher);
+      if (kPointerSize == 8) {
+        target_bytecode_matcher =
+            IsChangeUint32ToUint64(target_bytecode_matcher);
+      }
       Matcher<Node*> code_target_matcher = m.IsLoad(
           MachineType::Pointer(),
           IsParameter(InterpreterDispatchDescriptor::kDispatchTableParameter),
-          IsWord32Shl(target_bytecode_matcher,
-                      IsInt32Constant(kPointerSizeLog2)));
+          IsWordShl(target_bytecode_matcher,
+                    IsIntPtrConstant(kPointerSizeLog2)));
       EXPECT_THAT(
           end->InputAt(i),
           IsTailCall(
@@ -342,51 +480,55 @@
 }
 
 TARGET_TEST_F(InterpreterAssemblerTest, BytecodeOperand) {
+  static const OperandScale kOperandScales[] = {
+      OperandScale::kSingle, OperandScale::kDouble, OperandScale::kQuadruple};
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
-    InterpreterAssemblerForTest m(this, bytecode);
-    int number_of_operands = interpreter::Bytecodes::NumberOfOperands(bytecode);
-    for (int i = 0; i < number_of_operands; i++) {
-      int offset = interpreter::Bytecodes::GetOperandOffset(bytecode, i);
-      switch (interpreter::Bytecodes::GetOperandType(bytecode, i)) {
-        case interpreter::OperandType::kRegCount8:
-          EXPECT_THAT(m.BytecodeOperandCount(i), m.IsBytecodeOperand(offset));
-          break;
-        case interpreter::OperandType::kIdx8:
-          EXPECT_THAT(m.BytecodeOperandIdx(i), m.IsBytecodeOperand(offset));
-          break;
-        case interpreter::OperandType::kImm8:
-          EXPECT_THAT(m.BytecodeOperandImm(i),
-                      m.IsBytecodeOperandSignExtended(offset));
-          break;
-        case interpreter::OperandType::kMaybeReg8:
-        case interpreter::OperandType::kReg8:
-        case interpreter::OperandType::kRegOut8:
-        case interpreter::OperandType::kRegOutPair8:
-        case interpreter::OperandType::kRegOutTriple8:
-        case interpreter::OperandType::kRegPair8:
-          EXPECT_THAT(m.BytecodeOperandReg(i),
-                      m.IsBytecodeOperandSignExtended(offset));
-          break;
-        case interpreter::OperandType::kRegCount16:
-          EXPECT_THAT(m.BytecodeOperandCount(i),
-                      m.IsBytecodeOperandShort(offset));
-          break;
-        case interpreter::OperandType::kIdx16:
-          EXPECT_THAT(m.BytecodeOperandIdx(i),
-                      m.IsBytecodeOperandShort(offset));
-          break;
-        case interpreter::OperandType::kMaybeReg16:
-        case interpreter::OperandType::kReg16:
-        case interpreter::OperandType::kRegOut16:
-        case interpreter::OperandType::kRegOutPair16:
-        case interpreter::OperandType::kRegOutTriple16:
-        case interpreter::OperandType::kRegPair16:
-          EXPECT_THAT(m.BytecodeOperandReg(i),
-                      m.IsBytecodeOperandShortSignExtended(offset));
-          break;
-        case interpreter::OperandType::kNone:
-          UNREACHABLE();
-          break;
+    TRACED_FOREACH(interpreter::OperandScale, operand_scale, kOperandScales) {
+      InterpreterAssemblerForTest m(this, bytecode, operand_scale);
+      int number_of_operands =
+          interpreter::Bytecodes::NumberOfOperands(bytecode);
+      for (int i = 0; i < number_of_operands; i++) {
+        int offset = interpreter::Bytecodes::GetOperandOffset(bytecode, i,
+                                                              operand_scale);
+        OperandType operand_type =
+            interpreter::Bytecodes::GetOperandType(bytecode, i);
+        OperandSize operand_size =
+            Bytecodes::SizeOfOperand(operand_type, operand_scale);
+        switch (interpreter::Bytecodes::GetOperandType(bytecode, i)) {
+          case interpreter::OperandType::kRegCount:
+            EXPECT_THAT(m.BytecodeOperandCount(i),
+                        m.IsUnsignedOperand(offset, operand_size));
+            break;
+          case interpreter::OperandType::kFlag8:
+            EXPECT_THAT(m.BytecodeOperandFlag(i),
+                        m.IsUnsignedOperand(offset, operand_size));
+            break;
+          case interpreter::OperandType::kIdx:
+            EXPECT_THAT(m.BytecodeOperandIdx(i),
+                        m.IsUnsignedOperand(offset, operand_size));
+            break;
+          case interpreter::OperandType::kImm: {
+            EXPECT_THAT(m.BytecodeOperandImm(i),
+                        m.IsSignedOperand(offset, operand_size));
+            break;
+          }
+          case interpreter::OperandType::kMaybeReg:
+          case interpreter::OperandType::kReg:
+          case interpreter::OperandType::kRegOut:
+          case interpreter::OperandType::kRegOutPair:
+          case interpreter::OperandType::kRegOutTriple:
+          case interpreter::OperandType::kRegPair:
+            EXPECT_THAT(m.BytecodeOperandReg(i),
+                        m.IsSignedOperand(offset, operand_size));
+            break;
+          case interpreter::OperandType::kRuntimeId:
+            EXPECT_THAT(m.BytecodeOperandRuntimeId(i),
+                        m.IsUnsignedOperand(offset, operand_size));
+            break;
+          case interpreter::OperandType::kNone:
+            UNREACHABLE();
+            break;
+        }
       }
     }
   }
@@ -394,12 +536,16 @@
 
 TARGET_TEST_F(InterpreterAssemblerTest, GetSetAccumulator) {
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
+    if (!interpreter::Bytecodes::ReadsAccumulator(bytecode) ||
+        !interpreter::Bytecodes::WritesAccumulator(bytecode)) {
+      continue;
+    }
+
     InterpreterAssemblerForTest m(this, bytecode);
     // Should be incoming accumulator if not set.
     EXPECT_THAT(
         m.GetAccumulator(),
         IsParameter(InterpreterDispatchDescriptor::kAccumulatorParameter));
-
     // Should be set by SetAccumulator.
     Node* accumulator_value_1 = m.Int32Constant(0xdeadbeef);
     m.SetAccumulator(accumulator_value_1);
@@ -433,27 +579,27 @@
 TARGET_TEST_F(InterpreterAssemblerTest, RegisterLocation) {
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);
-    Node* reg_index_node = m.Int32Constant(44);
+    Node* reg_index_node = m.IntPtrConstant(44);
     Node* reg_location_node = m.RegisterLocation(reg_index_node);
     EXPECT_THAT(
         reg_location_node,
         IsIntPtrAdd(
             IsParameter(InterpreterDispatchDescriptor::kRegisterFileParameter),
-            IsWordShl(reg_index_node, IsInt32Constant(kPointerSizeLog2))));
+            IsWordShl(reg_index_node, IsIntPtrConstant(kPointerSizeLog2))));
   }
 }
 
 TARGET_TEST_F(InterpreterAssemblerTest, LoadRegister) {
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);
-    Node* reg_index_node = m.Int32Constant(44);
+    Node* reg_index_node = m.IntPtrConstant(44);
     Node* load_reg_node = m.LoadRegister(reg_index_node);
     EXPECT_THAT(
         load_reg_node,
         m.IsLoad(
             MachineType::AnyTagged(),
             IsParameter(InterpreterDispatchDescriptor::kRegisterFileParameter),
-            IsWordShl(reg_index_node, IsInt32Constant(kPointerSizeLog2))));
+            IsWordShl(reg_index_node, IsIntPtrConstant(kPointerSizeLog2))));
   }
 }
 
@@ -461,7 +607,7 @@
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);
     Node* store_value = m.Int32Constant(0xdeadbeef);
-    Node* reg_index_node = m.Int32Constant(44);
+    Node* reg_index_node = m.IntPtrConstant(44);
     Node* store_reg_node = m.StoreRegister(store_value, reg_index_node);
     EXPECT_THAT(
         store_reg_node,
@@ -469,7 +615,7 @@
             StoreRepresentation(MachineRepresentation::kTagged,
                                 kNoWriteBarrier),
             IsParameter(InterpreterDispatchDescriptor::kRegisterFileParameter),
-            IsWordShl(reg_index_node, IsInt32Constant(kPointerSizeLog2)),
+            IsWordShl(reg_index_node, IsIntPtrConstant(kPointerSizeLog2)),
             store_value));
   }
 }
@@ -478,10 +624,12 @@
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);
     Node* value = m.Int32Constant(44);
-    EXPECT_THAT(m.SmiTag(value),
-                IsWordShl(value, IsInt32Constant(kSmiShiftSize + kSmiTagSize)));
-    EXPECT_THAT(m.SmiUntag(value),
-                IsWordSar(value, IsInt32Constant(kSmiShiftSize + kSmiTagSize)));
+    EXPECT_THAT(
+        m.SmiTag(value),
+        IsWordShl(value, IsIntPtrConstant(kSmiShiftSize + kSmiTagSize)));
+    EXPECT_THAT(
+        m.SmiUntag(value),
+        IsWordSar(value, IsIntPtrConstant(kSmiShiftSize + kSmiTagSize)));
   }
 }
 
@@ -508,16 +656,16 @@
 TARGET_TEST_F(InterpreterAssemblerTest, WordShl) {
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);
-    Node* a = m.Int32Constant(0);
+    Node* a = m.IntPtrConstant(0);
     Node* add = m.WordShl(a, 10);
-    EXPECT_THAT(add, IsWordShl(a, IsInt32Constant(10)));
+    EXPECT_THAT(add, IsWordShl(a, IsIntPtrConstant(10)));
   }
 }
 
 TARGET_TEST_F(InterpreterAssemblerTest, LoadConstantPoolEntry) {
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);
-    Node* index = m.Int32Constant(2);
+    Node* index = m.IntPtrConstant(2);
     Node* load_constant = m.LoadConstantPoolEntry(index);
     Matcher<Node*> constant_pool_matcher = m.IsLoad(
         MachineType::AnyTagged(),
@@ -528,23 +676,7 @@
         m.IsLoad(MachineType::AnyTagged(), constant_pool_matcher,
                  IsIntPtrAdd(
                      IsIntPtrConstant(FixedArray::kHeaderSize - kHeapObjectTag),
-                     IsWordShl(index, IsInt32Constant(kPointerSizeLog2)))));
-  }
-}
-
-TARGET_TEST_F(InterpreterAssemblerTest, LoadFixedArrayElement) {
-  TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
-    InterpreterAssemblerForTest m(this, bytecode);
-    int index = 3;
-    Node* fixed_array = m.IntPtrConstant(0xdeadbeef);
-    Node* load_element = m.LoadFixedArrayElement(fixed_array, index);
-    EXPECT_THAT(
-        load_element,
-        m.IsLoad(MachineType::AnyTagged(), fixed_array,
-                 IsIntPtrAdd(
-                     IsIntPtrConstant(FixedArray::kHeaderSize - kHeapObjectTag),
-                     IsWordShl(IsInt32Constant(index),
-                               IsInt32Constant(kPointerSizeLog2)))));
+                     IsWordShl(index, IsIntPtrConstant(kPointerSizeLog2)))));
   }
 }
 
@@ -563,13 +695,13 @@
 TARGET_TEST_F(InterpreterAssemblerTest, LoadContextSlot) {
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);
-    Node* context = m.Int32Constant(1);
-    Node* slot_index = m.Int32Constant(22);
+    Node* context = m.IntPtrConstant(1);
+    Node* slot_index = m.IntPtrConstant(22);
     Node* load_context_slot = m.LoadContextSlot(context, slot_index);
 
     Matcher<Node*> offset =
-        IsIntPtrAdd(IsWordShl(slot_index, IsInt32Constant(kPointerSizeLog2)),
-                    IsInt32Constant(Context::kHeaderSize - kHeapObjectTag));
+        IsIntPtrAdd(IsWordShl(slot_index, IsIntPtrConstant(kPointerSizeLog2)),
+                    IsIntPtrConstant(Context::kHeaderSize - kHeapObjectTag));
     EXPECT_THAT(load_context_slot,
                 m.IsLoad(MachineType::AnyTagged(), context, offset));
   }
@@ -578,14 +710,14 @@
 TARGET_TEST_F(InterpreterAssemblerTest, StoreContextSlot) {
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);
-    Node* context = m.Int32Constant(1);
-    Node* slot_index = m.Int32Constant(22);
-    Node* value = m.Int32Constant(100);
+    Node* context = m.IntPtrConstant(1);
+    Node* slot_index = m.IntPtrConstant(22);
+    Node* value = m.SmiConstant(Smi::FromInt(100));
     Node* store_context_slot = m.StoreContextSlot(context, slot_index, value);
 
     Matcher<Node*> offset =
-        IsIntPtrAdd(IsWordShl(slot_index, IsInt32Constant(kPointerSizeLog2)),
-                    IsInt32Constant(Context::kHeaderSize - kHeapObjectTag));
+        IsIntPtrAdd(IsWordShl(slot_index, IsIntPtrConstant(kPointerSizeLog2)),
+                    IsIntPtrConstant(Context::kHeaderSize - kHeapObjectTag));
     EXPECT_THAT(store_context_slot,
                 m.IsStore(StoreRepresentation(MachineRepresentation::kTagged,
                                               kFullWriteBarrier),
@@ -629,7 +761,7 @@
           IsInt32Mul(function_id, IsInt32Constant(sizeof(Runtime::Function))));
       Matcher<Node*> function_entry =
           m.IsLoad(MachineType::Pointer(), function,
-                   IsInt32Constant(offsetof(Runtime::Function, entry)));
+                   IsIntPtrConstant(offsetof(Runtime::Function, entry)));
 
       Node* call_runtime = m.CallRuntimeN(function_id, context, first_arg,
                                           arg_count, result_size);
diff --git a/test/unittests/interpreter/interpreter-assembler-unittest.h b/test/unittests/interpreter/interpreter-assembler-unittest.h
index 321c724..1ebdc77 100644
--- a/test/unittests/interpreter/interpreter-assembler-unittest.h
+++ b/test/unittests/interpreter/interpreter-assembler-unittest.h
@@ -23,10 +23,12 @@
 
   class InterpreterAssemblerForTest final : public InterpreterAssembler {
    public:
-    InterpreterAssemblerForTest(InterpreterAssemblerTest* test,
-                                Bytecode bytecode)
-        : InterpreterAssembler(test->isolate(), test->zone(), bytecode) {}
-    ~InterpreterAssemblerForTest() override {}
+    InterpreterAssemblerForTest(
+        InterpreterAssemblerTest* test, Bytecode bytecode,
+        OperandScale operand_scale = OperandScale::kSingle)
+        : InterpreterAssembler(test->isolate(), test->zone(), bytecode,
+                               operand_scale) {}
+    ~InterpreterAssemblerForTest() override;
 
     Matcher<compiler::Node*> IsLoad(
         const Matcher<compiler::LoadRepresentation>& rep_matcher,
@@ -38,10 +40,17 @@
         const Matcher<compiler::Node*>& index_matcher,
         const Matcher<compiler::Node*>& value_matcher);
 
-    Matcher<compiler::Node*> IsBytecodeOperand(int offset);
-    Matcher<compiler::Node*> IsBytecodeOperandSignExtended(int offset);
-    Matcher<compiler::Node*> IsBytecodeOperandShort(int offset);
-    Matcher<compiler::Node*> IsBytecodeOperandShortSignExtended(int offset);
+    Matcher<compiler::Node*> IsUnsignedByteOperand(int offset);
+    Matcher<compiler::Node*> IsSignedByteOperand(int offset);
+    Matcher<compiler::Node*> IsUnsignedShortOperand(int offset);
+    Matcher<compiler::Node*> IsSignedShortOperand(int offset);
+    Matcher<compiler::Node*> IsUnsignedQuadOperand(int offset);
+    Matcher<compiler::Node*> IsSignedQuadOperand(int offset);
+
+    Matcher<compiler::Node*> IsSignedOperand(int offset,
+                                             OperandSize operand_size);
+    Matcher<compiler::Node*> IsUnsignedOperand(int offset,
+                                               OperandSize operand_size);
 
     using InterpreterAssembler::graph;
 
diff --git a/test/unittests/interpreter/register-translator-unittest.cc b/test/unittests/interpreter/register-translator-unittest.cc
deleted file mode 100644
index e9f65a6..0000000
--- a/test/unittests/interpreter/register-translator-unittest.cc
+++ /dev/null
@@ -1,260 +0,0 @@
-// Copyright 2014 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include <stack>
-
-#include "src/v8.h"
-
-#include "src/interpreter/register-translator.h"
-#include "src/isolate.h"
-#include "test/unittests/test-utils.h"
-
-namespace v8 {
-namespace internal {
-namespace interpreter {
-
-class RegisterTranslatorTest : public TestWithIsolateAndZone,
-                               private RegisterMover {
- public:
-  RegisterTranslatorTest() : translator_(this), move_count_(0) {
-    window_start_ =
-        RegisterTranslator::DistanceToTranslationWindow(Register(0));
-    window_width_ =
-        Register::MaxRegisterIndexForByteOperand() - window_start_ + 1;
-  }
-
-  ~RegisterTranslatorTest() override {}
-
-  bool PopMoveAndMatch(Register from, Register to) {
-    if (!moves_.empty()) {
-      CHECK(from.is_valid() && to.is_valid());
-      const std::pair<Register, Register> top = moves_.top();
-      moves_.pop();
-      return top.first == from && top.second == to;
-    } else {
-      return false;
-    }
-  }
-
-  int move_count() const { return move_count_; }
-  RegisterTranslator* translator() { return &translator_; }
-
-  int window_start() const { return window_start_; }
-  int window_width() const { return window_width_; }
-  int window_limit() const { return window_start_ + window_width_; }
-
- protected:
-  static const char* const kBadOperandRegex;
-
- private:
-  void MoveRegisterUntranslated(Register from, Register to) override {
-    moves_.push(std::make_pair(from, to));
-    move_count_++;
-  }
-
-  RegisterTranslator translator_;
-  std::stack<std::pair<Register, Register>> moves_;
-  int move_count_;
-  int window_start_;
-  int window_width_;
-};
-
-const char* const RegisterTranslatorTest::kBadOperandRegex =
-    ".*OperandType::kReg8 \\|\\| .*OperandType::kRegOut8\\) && "
-    "RegisterIsMovableToWindow.*";
-
-TEST_F(RegisterTranslatorTest, TestFrameSizeAdjustmentsForTranslationWindow) {
-  EXPECT_EQ(0, RegisterTranslator::RegisterCountAdjustment(0, 0));
-  EXPECT_EQ(0, RegisterTranslator::RegisterCountAdjustment(10, 10));
-  EXPECT_EQ(window_width(),
-            RegisterTranslator::RegisterCountAdjustment(173, 0));
-  EXPECT_EQ(window_width(),
-            RegisterTranslator::RegisterCountAdjustment(173, 137));
-  EXPECT_EQ(window_width(),
-            RegisterTranslator::RegisterCountAdjustment(173, 137));
-  // TODO(oth): Add a kMaxParameters8 that derives this info from the frame.
-  int param_limit = FLAG_enable_embedded_constant_pool ? 119 : 120;
-  EXPECT_EQ(0, RegisterTranslator::RegisterCountAdjustment(0, param_limit));
-  EXPECT_EQ(window_limit(),
-            RegisterTranslator::RegisterCountAdjustment(0, 128));
-  EXPECT_EQ(window_limit(),
-            RegisterTranslator::RegisterCountAdjustment(0, 129));
-  EXPECT_EQ(window_limit() - 32,
-            RegisterTranslator::RegisterCountAdjustment(32, 129));
-}
-
-TEST_F(RegisterTranslatorTest, TestInTranslationWindow) {
-  EXPECT_GE(window_start(), 0);
-  EXPECT_FALSE(
-      RegisterTranslator::InTranslationWindow(Register(window_start() - 1)));
-  EXPECT_TRUE(RegisterTranslator::InTranslationWindow(
-      Register(Register::MaxRegisterIndexForByteOperand())));
-  EXPECT_FALSE(RegisterTranslator::InTranslationWindow(
-      Register(Register::MaxRegisterIndexForByteOperand() + 1)));
-  for (int index = window_start(); index < window_limit(); index += 1) {
-    EXPECT_TRUE(RegisterTranslator::InTranslationWindow(Register(index)));
-  }
-}
-
-TEST_F(RegisterTranslatorTest, FitsInReg8Operand) {
-  EXPECT_GT(window_start(), 0);
-  EXPECT_TRUE(RegisterTranslator::FitsInReg8Operand(
-      Register::FromParameterIndex(0, 3)));
-  EXPECT_TRUE(RegisterTranslator::FitsInReg8Operand(
-      Register::FromParameterIndex(2, 3)));
-  EXPECT_TRUE(RegisterTranslator::FitsInReg8Operand(Register(0)));
-  EXPECT_TRUE(
-      RegisterTranslator::FitsInReg8Operand(Register(window_start() - 1)));
-  EXPECT_FALSE(RegisterTranslator::FitsInReg8Operand(Register(kMaxInt8)));
-  EXPECT_FALSE(RegisterTranslator::FitsInReg8Operand(Register(kMaxInt8 + 1)));
-  for (int index = window_start(); index < window_limit(); index += 1) {
-    EXPECT_FALSE(RegisterTranslator::FitsInReg8Operand(Register(index)));
-  }
-}
-
-TEST_F(RegisterTranslatorTest, FitsInReg16Operand) {
-  EXPECT_GT(window_start(), 0);
-  EXPECT_TRUE(RegisterTranslator::FitsInReg16Operand(
-      Register::FromParameterIndex(0, 3)));
-  EXPECT_TRUE(RegisterTranslator::FitsInReg16Operand(
-      Register::FromParameterIndex(2, 3)));
-  EXPECT_TRUE(RegisterTranslator::FitsInReg16Operand(
-      Register::FromParameterIndex(0, 999)));
-  EXPECT_TRUE(RegisterTranslator::FitsInReg16Operand(
-      Register::FromParameterIndex(0, Register::MaxParameterIndex() + 1)));
-  EXPECT_TRUE(RegisterTranslator::FitsInReg16Operand(Register(0)));
-  EXPECT_TRUE(
-      RegisterTranslator::FitsInReg16Operand(Register(window_start() - 1)));
-  EXPECT_TRUE(RegisterTranslator::FitsInReg16Operand(Register(kMaxInt8 + 1)));
-  EXPECT_TRUE(RegisterTranslator::FitsInReg16Operand(Register(kMaxInt8 + 2)));
-  for (int index = 0; index <= kMaxInt16 - window_width(); index += 1) {
-    EXPECT_TRUE(RegisterTranslator::FitsInReg16Operand(Register(index)));
-  }
-  for (int index = Register::MaxRegisterIndex() - window_width() + 1;
-       index < Register::MaxRegisterIndex() + 2; index += 1) {
-    EXPECT_FALSE(RegisterTranslator::FitsInReg16Operand(Register(index)));
-  }
-}
-
-TEST_F(RegisterTranslatorTest, NoTranslationRequired) {
-  Register window_reg(window_start());
-  Register local_reg(57);
-  uint32_t operands[] = {local_reg.ToRawOperand()};
-  translator()->TranslateInputRegisters(Bytecode::kLdar, operands, 1);
-  translator()->TranslateOutputRegisters();
-  EXPECT_EQ(0, move_count());
-
-  Register param_reg = Register::FromParameterIndex(129, 130);
-  operands[0] = param_reg.ToRawOperand();
-  translator()->TranslateInputRegisters(Bytecode::kAdd, operands, 1);
-  translator()->TranslateOutputRegisters();
-  EXPECT_EQ(0, move_count());
-}
-
-TEST_F(RegisterTranslatorTest, TranslationRequired) {
-  Register window_reg(window_start());
-  Register local_reg(137);
-  Register local_reg_translated(local_reg.index() + window_width());
-
-  uint32_t operands[] = {local_reg.ToRawOperand()};
-  translator()->TranslateInputRegisters(Bytecode::kLdar, operands, 1);
-  EXPECT_EQ(1, move_count());
-  EXPECT_TRUE(PopMoveAndMatch(local_reg_translated, window_reg));
-  translator()->TranslateOutputRegisters();
-  EXPECT_EQ(1, move_count());
-  EXPECT_FALSE(PopMoveAndMatch(window_reg, local_reg_translated));
-
-  operands[0] = local_reg.ToRawOperand();
-  translator()->TranslateInputRegisters(Bytecode::kStar, operands, 1);
-  EXPECT_EQ(1, move_count());
-  EXPECT_FALSE(PopMoveAndMatch(local_reg_translated, window_reg));
-  translator()->TranslateOutputRegisters();
-  EXPECT_EQ(2, move_count());
-  EXPECT_TRUE(PopMoveAndMatch(window_reg, local_reg_translated));
-
-  Register param_reg = Register::FromParameterIndex(0, 130);
-  operands[0] = {param_reg.ToRawOperand()};
-  translator()->TranslateInputRegisters(Bytecode::kLdar, operands, 1);
-  EXPECT_EQ(3, move_count());
-  EXPECT_TRUE(PopMoveAndMatch(param_reg, window_reg));
-  translator()->TranslateOutputRegisters();
-  EXPECT_EQ(3, move_count());
-  EXPECT_FALSE(PopMoveAndMatch(window_reg, param_reg));
-
-  operands[0] = {param_reg.ToRawOperand()};
-  translator()->TranslateInputRegisters(Bytecode::kStar, operands, 1);
-  EXPECT_EQ(3, move_count());
-  EXPECT_FALSE(PopMoveAndMatch(local_reg_translated, window_reg));
-  translator()->TranslateOutputRegisters();
-  EXPECT_EQ(4, move_count());
-  EXPECT_TRUE(PopMoveAndMatch(window_reg, param_reg));
-}
-
-TEST_F(RegisterTranslatorTest, RangeTranslation) {
-  Register window0(window_start());
-  Register window1(window_start() + 1);
-  Register window2(window_start() + 2);
-  uint32_t operands[3];
-
-  // Bytecode::kNew with valid range operand.
-  Register constructor0(0);
-  Register args0(1);
-  operands[0] = constructor0.ToRawOperand();
-  operands[1] = args0.ToRawOperand();
-  operands[2] = 1;
-  translator()->TranslateInputRegisters(Bytecode::kNew, operands, 3);
-  translator()->TranslateOutputRegisters();
-  EXPECT_EQ(0, move_count());
-
-  // Bytecode::kNewWide with valid range operand.
-  Register constructor1(128);
-  Register constructor1_translated(constructor1.index() + window_width());
-  Register args1(129);
-  Register args1_translated(args1.index() + window_width());
-  operands[0] = constructor1.ToRawOperand();
-  operands[1] = args1.ToRawOperand();
-  operands[2] = 3;
-  translator()->TranslateInputRegisters(Bytecode::kNewWide, operands, 3);
-  translator()->TranslateOutputRegisters();
-  EXPECT_EQ(0, move_count());
-}
-
-TEST_F(RegisterTranslatorTest, BadRange0) {
-  // Bytecode::kNew with invalid range operand (kMaybeReg8).
-  Register constructor1(128);
-  Register args1(129);
-  uint32_t operands[] = {constructor1.ToRawOperand(), args1.ToRawOperand(), 3};
-  ASSERT_DEATH_IF_SUPPORTED(
-      translator()->TranslateInputRegisters(Bytecode::kNew, operands, 3),
-      kBadOperandRegex);
-}
-
-TEST_F(RegisterTranslatorTest, BadRange1) {
-  // Bytecode::kForInPrepare with invalid range operand (kRegTriple8)
-  Register for_in_state(160);
-  Register for_in_state_translated(for_in_state.index() + window_width());
-  uint32_t operands[] = {for_in_state.ToRawOperand()};
-  ASSERT_DEATH_IF_SUPPORTED(translator()->TranslateInputRegisters(
-                                Bytecode::kForInPrepare, operands, 1),
-                            kBadOperandRegex);
-}
-
-TEST_F(RegisterTranslatorTest, BadRange2) {
-  // Bytecode::kForInNext with invalid range operand (kRegPair8)
-  Register receiver(192);
-  Register receiver_translated(receiver.index() + window_width());
-  Register index(193);
-  Register index_translated(index.index() + window_width());
-  Register cache_info_pair(194);
-  Register cache_info_pair_translated(cache_info_pair.index() + window_width());
-  uint32_t operands[] = {receiver.ToRawOperand(), index.ToRawOperand(),
-                         cache_info_pair.ToRawOperand()};
-  ASSERT_DEATH_IF_SUPPORTED(
-      translator()->TranslateInputRegisters(Bytecode::kForInNext, operands, 3),
-      kBadOperandRegex);
-}
-
-}  // namespace interpreter
-}  // namespace internal
-}  // namespace v8
diff --git a/test/unittests/interpreter/source-position-table-unittest.cc b/test/unittests/interpreter/source-position-table-unittest.cc
new file mode 100644
index 0000000..d62302a
--- /dev/null
+++ b/test/unittests/interpreter/source-position-table-unittest.cc
@@ -0,0 +1,84 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/v8.h"
+
+#include "src/interpreter/source-position-table.h"
+#include "test/unittests/test-utils.h"
+
+namespace v8 {
+namespace internal {
+namespace interpreter {
+
+class SourcePositionTableTest : public TestWithIsolateAndZone {
+ public:
+  SourcePositionTableTest() {}
+  ~SourcePositionTableTest() override {}
+};
+
+// Some random offsets, mostly at 'suspicious' bit boundaries.
+static int offsets[] = {0,   1,   2,    3,    4,     30,      31,  32,
+                        33,  62,  63,   64,   65,    126,     127, 128,
+                        129, 250, 1000, 9999, 12000, 31415926};
+
+TEST_F(SourcePositionTableTest, EncodeStatement) {
+  SourcePositionTableBuilder builder(isolate(), zone());
+  for (int i = 0; i < arraysize(offsets); i++) {
+    builder.AddStatementPosition(offsets[i], offsets[i]);
+  }
+
+  // To test correctness, we rely on the assertions in ToSourcePositionTable().
+  // (Also below.)
+  CHECK(!builder.ToSourcePositionTable().is_null());
+}
+
+TEST_F(SourcePositionTableTest, EncodeStatementDuplicates) {
+  SourcePositionTableBuilder builder(isolate(), zone());
+  for (int i = 0; i < arraysize(offsets); i++) {
+    builder.AddStatementPosition(offsets[i], offsets[i]);
+    builder.AddStatementPosition(offsets[i], offsets[i] + 1);
+  }
+
+  // To test correctness, we rely on the assertions in ToSourcePositionTable().
+  // (Also below.)
+  CHECK(!builder.ToSourcePositionTable().is_null());
+}
+
+TEST_F(SourcePositionTableTest, EncodeExpression) {
+  SourcePositionTableBuilder builder(isolate(), zone());
+  for (int i = 0; i < arraysize(offsets); i++) {
+    builder.AddExpressionPosition(offsets[i], offsets[i]);
+  }
+  CHECK(!builder.ToSourcePositionTable().is_null());
+}
+
+TEST_F(SourcePositionTableTest, EncodeAscending) {
+  SourcePositionTableBuilder builder(isolate(), zone());
+
+  int accumulator = 0;
+  for (int i = 0; i < arraysize(offsets); i++) {
+    accumulator += offsets[i];
+    if (i % 2) {
+      builder.AddStatementPosition(accumulator, accumulator);
+    } else {
+      builder.AddExpressionPosition(accumulator, accumulator);
+    }
+  }
+
+  // Also test negative offsets:
+  for (int i = 0; i < arraysize(offsets); i++) {
+    accumulator -= offsets[i];
+    if (i % 2) {
+      builder.AddStatementPosition(accumulator, accumulator);
+    } else {
+      builder.AddExpressionPosition(accumulator, accumulator);
+    }
+  }
+
+  CHECK(!builder.ToSourcePositionTable().is_null());
+}
+
+}  // namespace interpreter
+}  // namespace internal
+}  // namespace v8
diff --git a/test/unittests/runtime/runtime-interpreter-unittest.cc b/test/unittests/runtime/runtime-interpreter-unittest.cc
deleted file mode 100644
index c10ddcd..0000000
--- a/test/unittests/runtime/runtime-interpreter-unittest.cc
+++ /dev/null
@@ -1,73 +0,0 @@
-// Copyright 2015 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/v8.h"
-
-#include "src/factory.h"
-#include "src/heap/heap.h"
-#include "src/heap/heap-inl.h"
-#include "src/runtime/runtime.h"
-#include "test/unittests/test-utils.h"
-
-namespace v8 {
-namespace internal {
-namespace interpreter {
-
-class RuntimeInterpreterTest : public TestWithIsolateAndZone {
- public:
-  typedef Object* (*RuntimeMethod)(int, Object**, Isolate*);
-
-  RuntimeInterpreterTest() {}
-  ~RuntimeInterpreterTest() override {}
-
-  bool TestOperatorWithObjects(RuntimeMethod method, Handle<Object> lhs,
-                               Handle<Object> rhs, bool expected);
-};
-
-
-bool RuntimeInterpreterTest::TestOperatorWithObjects(RuntimeMethod method,
-                                                     Handle<Object> lhs,
-                                                     Handle<Object> rhs,
-                                                     bool expected) {
-  Object* args_object[] = {*rhs, *lhs};
-  Handle<Object> result =
-      handle(method(2, &args_object[1], isolate()), isolate());
-  CHECK(result->IsTrue() || result->IsFalse());
-  return result->IsTrue() == expected;
-}
-
-
-TEST_F(RuntimeInterpreterTest, ToBoolean) {
-  double quiet_nan = std::numeric_limits<double>::quiet_NaN();
-  std::pair<Handle<Object>, bool> cases[] = {
-      std::make_pair(isolate()->factory()->NewNumberFromInt(0), false),
-      std::make_pair(isolate()->factory()->NewNumberFromInt(1), true),
-      std::make_pair(isolate()->factory()->NewNumberFromInt(100), true),
-      std::make_pair(isolate()->factory()->NewNumberFromInt(-1), true),
-      std::make_pair(isolate()->factory()->NewNumber(7.7), true),
-      std::make_pair(isolate()->factory()->NewNumber(0.00001), true),
-      std::make_pair(isolate()->factory()->NewNumber(quiet_nan), false),
-      std::make_pair(isolate()->factory()->NewHeapNumber(0.0), false),
-      std::make_pair(isolate()->factory()->undefined_value(), false),
-      std::make_pair(isolate()->factory()->null_value(), false),
-      std::make_pair(isolate()->factory()->true_value(), true),
-      std::make_pair(isolate()->factory()->false_value(), false),
-      std::make_pair(isolate()->factory()->NewStringFromStaticChars(""), false),
-      std::make_pair(isolate()->factory()->NewStringFromStaticChars("_"), true),
-  };
-
-  for (size_t i = 0; i < arraysize(cases); i++) {
-    auto& value_expected_tuple = cases[i];
-    Object* args_object[] = {*value_expected_tuple.first};
-    Handle<Object> result = handle(
-        Runtime_InterpreterToBoolean(1, &args_object[0], isolate()), isolate());
-    CHECK(result->IsBoolean());
-    CHECK_EQ(result->IsTrue(), value_expected_tuple.second);
-  }
-}
-
-
-}  // namespace interpreter
-}  // namespace internal
-}  // namespace v8
diff --git a/test/unittests/test-utils.h b/test/unittests/test-utils.h
index 78283bf..1342510 100644
--- a/test/unittests/test-utils.h
+++ b/test/unittests/test-utils.h
@@ -93,12 +93,13 @@
 
 class TestWithZone : public virtual ::testing::Test {
  public:
-  TestWithZone() {}
+  TestWithZone() : zone_(&allocator_) {}
   virtual ~TestWithZone();
 
   Zone* zone() { return &zone_; }
 
  private:
+  base::AccountingAllocator allocator_;
   Zone zone_;
 
   DISALLOW_COPY_AND_ASSIGN(TestWithZone);
@@ -107,12 +108,13 @@
 
 class TestWithIsolateAndZone : public virtual TestWithIsolate {
  public:
-  TestWithIsolateAndZone() {}
+  TestWithIsolateAndZone() : zone_(&allocator_) {}
   virtual ~TestWithIsolateAndZone();
 
   Zone* zone() { return &zone_; }
 
  private:
+  base::AccountingAllocator allocator_;
   Zone zone_;
 
   DISALLOW_COPY_AND_ASSIGN(TestWithIsolateAndZone);
diff --git a/test/unittests/unittests.gyp b/test/unittests/unittests.gyp
index 638fd84..003281b 100644
--- a/test/unittests/unittests.gyp
+++ b/test/unittests/unittests.gyp
@@ -83,7 +83,6 @@
         'compiler/opcodes-unittest.cc',
         'compiler/register-allocator-unittest.cc',
         'compiler/schedule-unittest.cc',
-        'compiler/select-lowering-unittest.cc',
         'compiler/scheduler-unittest.cc',
         'compiler/scheduler-rpo-unittest.cc',
         'compiler/simplified-operator-reducer-unittest.cc',
@@ -101,22 +100,23 @@
         'interpreter/constant-array-builder-unittest.cc',
         'interpreter/interpreter-assembler-unittest.cc',
         'interpreter/interpreter-assembler-unittest.h',
-        'interpreter/register-translator-unittest.cc',
+        'interpreter/source-position-table-unittest.cc',
         'libplatform/default-platform-unittest.cc',
         'libplatform/task-queue-unittest.cc',
         'libplatform/worker-thread-unittest.cc',
         'heap/bitmap-unittest.cc',
         'heap/gc-idle-time-handler-unittest.cc',
+        'heap/gc-tracer-unittest.cc',
         'heap/memory-reducer-unittest.cc',
         'heap/heap-unittest.cc',
         'heap/scavenge-job-unittest.cc',
         'heap/slot-set-unittest.cc',
         'locked-queue-unittest.cc',
         'run-all-unittests.cc',
-        'runtime/runtime-interpreter-unittest.cc',
         'test-utils.h',
         'test-utils.cc',
         'wasm/ast-decoder-unittest.cc',
+        'wasm/decoder-unittest.cc',
         'wasm/encoder-unittest.cc',
         'wasm/loop-assignment-analysis-unittest.cc',
         'wasm/module-decoder-unittest.cc',
@@ -158,6 +158,11 @@
             'compiler/ppc/instruction-selector-ppc-unittest.cc',
           ],
         }],
+        ['v8_target_arch=="s390" or v8_target_arch=="s390x"', {
+          'sources': [  ### gcmole(arch:s390) ###
+            'compiler/s390/instruction-selector-s390-unittest.cc',
+          ],
+        }],
         ['OS=="aix"', {
           'ldflags': [ '-Wl,-bbigtoc' ],
         }],
diff --git a/test/unittests/unittests.status b/test/unittests/unittests.status
index 18201cd..40b5754 100644
--- a/test/unittests/unittests.status
+++ b/test/unittests/unittests.status
@@ -9,6 +9,8 @@
   'WasmFunctionVerifyTest*': [SKIP],
   'WasmDecoderTest.TableSwitch*': [SKIP],
   'WasmDecoderTest.AllLoadMemCombinations': [SKIP],
+  'AstDecoderTest.AllLoadMemCombinations': [SKIP],
+  'AstDecoderTest.AllStoreMemCombinations': [SKIP],
+  'Bytecodes.DecodeBytecodeAndOperands': [SKIP],
 }],  # 'byteorder == big'
-
 ]
diff --git a/test/unittests/wasm/ast-decoder-unittest.cc b/test/unittests/wasm/ast-decoder-unittest.cc
index 6721587..0b1b79e 100644
--- a/test/unittests/wasm/ast-decoder-unittest.cc
+++ b/test/unittests/wasm/ast-decoder-unittest.cc
@@ -55,51 +55,34 @@
     Verify(kError, env, code, code + arraysize(code)); \
   } while (false)
 
-#define VERIFY(...)                                        \
-  do {                                                     \
-    static const byte code[] = {__VA_ARGS__};              \
-    Verify(kSuccess, &env_v_i, code, code + sizeof(code)); \
+#define VERIFY(...)                                          \
+  do {                                                       \
+    static const byte code[] = {__VA_ARGS__};                \
+    Verify(kSuccess, sigs.v_i(), code, code + sizeof(code)); \
   } while (false)
 
-
-class WasmDecoderTest : public TestWithZone {
+class AstDecoderTest : public TestWithZone {
  public:
-  WasmDecoderTest() : TestWithZone(), sigs() {
-    init_env(&env_i_i, sigs.i_i());
-    init_env(&env_v_v, sigs.v_v());
-    init_env(&env_v_i, sigs.v_i());
-    init_env(&env_i_f, sigs.i_f());
-    init_env(&env_i_d, sigs.i_d());
-    init_env(&env_l_l, sigs.l_l());
-    init_env(&env_f_ff, sigs.f_ff());
-    init_env(&env_d_dd, sigs.d_dd());
-  }
+  typedef std::pair<uint32_t, LocalType> LocalsDecl;
 
+  AstDecoderTest() : module(nullptr) {}
   TestSignatures sigs;
+  ModuleEnv* module;
+  LocalDeclEncoder local_decls;
 
-  FunctionEnv env_i_i;
-  FunctionEnv env_v_v;
-  FunctionEnv env_v_i;
-  FunctionEnv env_i_f;
-  FunctionEnv env_i_d;
-  FunctionEnv env_l_l;
-  FunctionEnv env_f_ff;
-  FunctionEnv env_d_dd;
-
-  static void init_env(FunctionEnv* env, FunctionSig* sig) {
-    env->module = nullptr;
-    env->sig = sig;
-    env->local_i32_count = 0;
-    env->local_i64_count = 0;
-    env->local_f32_count = 0;
-    env->local_f64_count = 0;
-    env->SumLocals();
+  void AddLocals(LocalType type, uint32_t count) {
+    local_decls.AddLocals(count, type);
   }
 
-  // A wrapper around VerifyWasmCode() that renders a nice failure message.
-  void Verify(ErrorCode expected, FunctionEnv* env, const byte* start,
+  // Preprends local variable declarations and renders nice error messages for
+  // verification failures.
+  void Verify(ErrorCode expected, FunctionSig* sig, const byte* start,
               const byte* end) {
-    TreeResult result = VerifyWasmCode(env, start, end);
+    local_decls.Prepend(&start, &end);
+    // Verify the code.
+    TreeResult result =
+        VerifyWasmCode(zone()->allocator(), module, sig, start, end);
+
     if (result.error_code != expected) {
       ptrdiff_t pc = result.error_pc - result.start;
       ptrdiff_t pt = result.error_pt - result.start;
@@ -118,15 +101,15 @@
       }
       FATAL(str.str().c_str());
     }
+
+    delete[] start;  // local_decls.Prepend() allocated a new buffer.
   }
 
   void TestBinop(WasmOpcode opcode, FunctionSig* success) {
     // op(local[0], local[1])
     byte code[] = {static_cast<byte>(opcode), kExprGetLocal, 0, kExprGetLocal,
                    1};
-    FunctionEnv env;
-    init_env(&env, success);
-    EXPECT_VERIFIES(&env, code);
+    EXPECT_VERIFIES(success, code);
 
     // Try all combinations of return and parameter types.
     for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
@@ -138,8 +121,7 @@
               types[2] != success->GetParam(1)) {
             // Test signature mismatch.
             FunctionSig sig(1, 2, types);
-            init_env(&env, &sig);
-            EXPECT_FAILURE(&env, code);
+            EXPECT_FAILURE(&sig, code);
           }
         }
       }
@@ -153,12 +135,10 @@
   void TestUnop(WasmOpcode opcode, LocalType ret_type, LocalType param_type) {
     // Return(op(local[0]))
     byte code[] = {static_cast<byte>(opcode), kExprGetLocal, 0};
-    FunctionEnv env;
     {
       LocalType types[] = {ret_type, param_type};
       FunctionSig sig(1, 1, types);
-      init_env(&env, &sig);
-      EXPECT_VERIFIES(&env, code);
+      EXPECT_VERIFIES(&sig, code);
     }
 
     // Try all combinations of return and parameter types.
@@ -168,8 +148,7 @@
         if (types[0] != ret_type || types[1] != param_type) {
           // Test signature mismatch.
           FunctionSig sig(1, 1, types);
-          init_env(&env, &sig);
-          EXPECT_FAILURE(&env, code);
+          EXPECT_FAILURE(&sig, code);
         }
       }
     }
@@ -177,211 +156,164 @@
 };
 
 
-static FunctionEnv CreateInt32FunctionEnv(FunctionSig* sig, int count) {
-  FunctionEnv env;
-  env.module = nullptr;
-  env.sig = sig;
-  env.local_i32_count = count;
-  env.local_f64_count = 0;
-  env.local_f32_count = 0;
-  env.total_locals = static_cast<unsigned>(count + sig->parameter_count());
-  return env;
-}
-
-
-TEST_F(WasmDecoderTest, Int8Const) {
+TEST_F(AstDecoderTest, Int8Const) {
   byte code[] = {kExprI8Const, 0};
   for (int i = -128; i < 128; i++) {
     code[1] = static_cast<byte>(i);
-    EXPECT_VERIFIES(&env_i_i, code);
+    EXPECT_VERIFIES(sigs.i_i(), code);
   }
 }
 
-
-TEST_F(WasmDecoderTest, EmptyFunction) {
+TEST_F(AstDecoderTest, EmptyFunction) {
   byte code[] = {0};
-  Verify(kSuccess, &env_v_v, code, code);
-  Verify(kError, &env_i_i, code, code);
+  Verify(kSuccess, sigs.v_v(), code, code);
+  Verify(kError, sigs.i_i(), code, code);
 }
 
-
-TEST_F(WasmDecoderTest, IncompleteIf1) {
+TEST_F(AstDecoderTest, IncompleteIf1) {
   byte code[] = {kExprIf};
-  EXPECT_FAILURE(&env_v_v, code);
-  EXPECT_FAILURE(&env_i_i, code);
+  EXPECT_FAILURE(sigs.v_v(), code);
+  EXPECT_FAILURE(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, IncompleteIf2) {
+TEST_F(AstDecoderTest, IncompleteIf2) {
   byte code[] = {kExprIf, kExprI8Const, 0};
-  EXPECT_FAILURE(&env_v_v, code);
-  EXPECT_FAILURE(&env_i_i, code);
+  EXPECT_FAILURE(sigs.v_v(), code);
+  EXPECT_FAILURE(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Int8Const_fallthru) {
+TEST_F(AstDecoderTest, Int8Const_fallthru) {
   byte code[] = {kExprI8Const, 0, kExprI8Const, 1};
-  EXPECT_VERIFIES(&env_i_i, code);
+  EXPECT_VERIFIES(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Int32Const) {
-  byte code[] = {kExprI32Const, 0, 0, 0, 0};
-  int32_t* ptr = reinterpret_cast<int32_t*>(code + 1);
+TEST_F(AstDecoderTest, Int32Const) {
   const int kInc = 4498211;
   for (int32_t i = kMinInt; i < kMaxInt - kInc; i = i + kInc) {
-    *ptr = i;
-    EXPECT_VERIFIES(&env_i_i, code);
+    // TODO(binji): expand test for other sized int32s; 1 through 5 bytes.
+    byte code[] = {WASM_I32V(i)};
+    EXPECT_VERIFIES(sigs.i_i(), code);
   }
 }
 
-
-TEST_F(WasmDecoderTest, Int8Const_fallthru2) {
-  byte code[] = {kExprI8Const, 0, kExprI32Const, 1, 2, 3, 4};
-  EXPECT_VERIFIES(&env_i_i, code);
+TEST_F(AstDecoderTest, Int8Const_fallthru2) {
+  byte code[] = {WASM_I8(0), WASM_I32V_4(0x1122334)};
+  EXPECT_VERIFIES(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Int64Const) {
-  byte code[] = {kExprI64Const, 0, 0, 0, 0, 0, 0, 0, 0};
-  int64_t* ptr = reinterpret_cast<int64_t*>(code + 1);
+TEST_F(AstDecoderTest, Int64Const) {
   const int kInc = 4498211;
   for (int32_t i = kMinInt; i < kMaxInt - kInc; i = i + kInc) {
-    *ptr = (static_cast<int64_t>(i) << 32) | i;
-    EXPECT_VERIFIES(&env_l_l, code);
+    byte code[] = {WASM_I64V((static_cast<int64_t>(i) << 32) | i)};
+    EXPECT_VERIFIES(sigs.l_l(), code);
   }
 }
 
-
-TEST_F(WasmDecoderTest, Float32Const) {
+TEST_F(AstDecoderTest, Float32Const) {
   byte code[] = {kExprF32Const, 0, 0, 0, 0};
   float* ptr = reinterpret_cast<float*>(code + 1);
   for (int i = 0; i < 30; i++) {
     *ptr = i * -7.75f;
-    EXPECT_VERIFIES(&env_f_ff, code);
+    EXPECT_VERIFIES(sigs.f_ff(), code);
   }
 }
 
-
-TEST_F(WasmDecoderTest, Float64Const) {
+TEST_F(AstDecoderTest, Float64Const) {
   byte code[] = {kExprF64Const, 0, 0, 0, 0, 0, 0, 0, 0};
   double* ptr = reinterpret_cast<double*>(code + 1);
   for (int i = 0; i < 30; i++) {
     *ptr = i * 33.45;
-    EXPECT_VERIFIES(&env_d_dd, code);
+    EXPECT_VERIFIES(sigs.d_dd(), code);
   }
 }
 
-
-TEST_F(WasmDecoderTest, Int32Const_off_end) {
+TEST_F(AstDecoderTest, Int32Const_off_end) {
   byte code[] = {kExprI32Const, 0xaa, 0xbb, 0xcc, 0x44};
 
   for (int size = 1; size <= 4; size++) {
-    Verify(kError, &env_i_i, code, code + size);
+    Verify(kError, sigs.i_i(), code, code + size);
   }
 }
 
-
-TEST_F(WasmDecoderTest, GetLocal0_param) {
-  EXPECT_VERIFIES(&env_i_i, kCodeGetLocal0);
+TEST_F(AstDecoderTest, GetLocal0_param) {
+  EXPECT_VERIFIES(sigs.i_i(), kCodeGetLocal0);
 }
 
-
-TEST_F(WasmDecoderTest, GetLocal0_local) {
-  FunctionEnv env;
-  init_env(&env, sigs.i_v());
-  env.AddLocals(kAstI32, 1);
-  EXPECT_VERIFIES(&env, kCodeGetLocal0);
+TEST_F(AstDecoderTest, GetLocal0_local) {
+  AddLocals(kAstI32, 1);
+  EXPECT_VERIFIES(sigs.i_v(), kCodeGetLocal0);
 }
 
-
-TEST_F(WasmDecoderTest, GetLocal0_param_n) {
+TEST_F(AstDecoderTest, GetLocal0_param_n) {
   FunctionSig* array[] = {sigs.i_i(), sigs.i_ii(), sigs.i_iii()};
 
   for (size_t i = 0; i < arraysize(array); i++) {
-    FunctionEnv env = CreateInt32FunctionEnv(array[i], 0);
-    EXPECT_VERIFIES(&env, kCodeGetLocal0);
+    EXPECT_VERIFIES(array[i], kCodeGetLocal0);
   }
 }
 
-
-TEST_F(WasmDecoderTest, GetLocalN_local) {
+TEST_F(AstDecoderTest, GetLocalN_local) {
   for (byte i = 1; i < 8; i++) {
-    FunctionEnv env = CreateInt32FunctionEnv(sigs.i_v(), i);
+    AddLocals(kAstI32, 1);
     for (byte j = 0; j < i; j++) {
       byte code[] = {kExprGetLocal, j};
-      EXPECT_VERIFIES(&env, code);
+      EXPECT_VERIFIES(sigs.i_v(), code);
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, GetLocal0_fail_no_params) {
-  FunctionEnv env = CreateInt32FunctionEnv(sigs.i_v(), 0);
-
-  EXPECT_FAILURE(&env, kCodeGetLocal0);
+TEST_F(AstDecoderTest, GetLocal0_fail_no_params) {
+  EXPECT_FAILURE(sigs.i_v(), kCodeGetLocal0);
 }
 
-
-TEST_F(WasmDecoderTest, GetLocal1_fail_no_locals) {
-  EXPECT_FAILURE(&env_i_i, kCodeGetLocal1);
+TEST_F(AstDecoderTest, GetLocal1_fail_no_locals) {
+  EXPECT_FAILURE(sigs.i_i(), kCodeGetLocal1);
 }
 
-
-TEST_F(WasmDecoderTest, GetLocal_off_end) {
+TEST_F(AstDecoderTest, GetLocal_off_end) {
   static const byte code[] = {kExprGetLocal};
-  EXPECT_FAILURE(&env_i_i, code);
+  EXPECT_FAILURE(sigs.i_i(), code);
 }
 
+TEST_F(AstDecoderTest, GetLocal_varint) {
+  const int kMaxLocals = 8000000;
+  AddLocals(kAstI32, kMaxLocals);
 
-TEST_F(WasmDecoderTest, GetLocal_varint) {
-  env_i_i.local_i32_count = 1000000000;
-  env_i_i.total_locals += 1000000000;
-
-  {
-    static const byte code[] = {kExprGetLocal, 0xFF, 0x01};
-    EXPECT_VERIFIES(&env_i_i, code);
-    EXPECT_FAILURE(&env_i_f, code);
+  for (int index = 0; index < kMaxLocals; index = index * 11 + 5) {
+    EXPECT_VERIFIES_INLINE(sigs.i_i(), kExprGetLocal, U32V_1(index));
+    EXPECT_VERIFIES_INLINE(sigs.i_i(), kExprGetLocal, U32V_2(index));
+    EXPECT_VERIFIES_INLINE(sigs.i_i(), kExprGetLocal, U32V_3(index));
+    EXPECT_VERIFIES_INLINE(sigs.i_i(), kExprGetLocal, U32V_4(index));
   }
 
-  {
-    static const byte code[] = {kExprGetLocal, 0xF0, 0x80, 0x01};
-    EXPECT_VERIFIES(&env_i_i, code);
-    EXPECT_FAILURE(&env_i_f, code);
-  }
+  EXPECT_VERIFIES_INLINE(sigs.i_i(), kExprGetLocal, U32V_5(kMaxLocals - 1));
 
-  {
-    static const byte code[] = {kExprGetLocal, 0xF2, 0x81, 0x82, 0x01};
-    EXPECT_VERIFIES(&env_i_i, code);
-    EXPECT_FAILURE(&env_i_f, code);
-  }
+  EXPECT_VERIFIES_INLINE(sigs.i_i(), kExprGetLocal, U32V_4(kMaxLocals - 1));
+  EXPECT_VERIFIES_INLINE(sigs.i_i(), kExprGetLocal, U32V_4(kMaxLocals));
+  EXPECT_FAILURE_INLINE(sigs.i_i(), kExprGetLocal, U32V_4(kMaxLocals + 1));
 
-  {
-    static const byte code[] = {kExprGetLocal, 0xF3, 0xA1, 0xB1, 0xC1, 0x01};
-    EXPECT_VERIFIES(&env_i_i, code);
-    EXPECT_FAILURE(&env_i_f, code);
-  }
+  EXPECT_FAILURE_INLINE(sigs.i_v(), kExprGetLocal, U32V_4(kMaxLocals));
+  EXPECT_FAILURE_INLINE(sigs.i_v(), kExprGetLocal, U32V_4(kMaxLocals + 1));
 }
 
-
-TEST_F(WasmDecoderTest, Binops_off_end) {
+TEST_F(AstDecoderTest, Binops_off_end) {
   byte code1[] = {0};  // [opcode]
   for (size_t i = 0; i < arraysize(kInt32BinopOpcodes); i++) {
     code1[0] = kInt32BinopOpcodes[i];
-    EXPECT_FAILURE(&env_i_i, code1);
+    EXPECT_FAILURE(sigs.i_i(), code1);
   }
 
   byte code3[] = {0, kExprGetLocal, 0};  // [opcode] [expr]
   for (size_t i = 0; i < arraysize(kInt32BinopOpcodes); i++) {
     code3[0] = kInt32BinopOpcodes[i];
-    EXPECT_FAILURE(&env_i_i, code3);
+    EXPECT_FAILURE(sigs.i_i(), code3);
   }
 
   byte code4[] = {0, kExprGetLocal, 0, 0};  // [opcode] [expr] [opcode]
   for (size_t i = 0; i < arraysize(kInt32BinopOpcodes); i++) {
     code4[0] = kInt32BinopOpcodes[i];
     code4[3] = kInt32BinopOpcodes[i];
-    EXPECT_FAILURE(&env_i_i, code4);
+    EXPECT_FAILURE(sigs.i_i(), code4);
   }
 }
 
@@ -389,79 +321,68 @@
 //===================================================================
 //== Statements
 //===================================================================
-TEST_F(WasmDecoderTest, Nop) {
+TEST_F(AstDecoderTest, Nop) {
   static const byte code[] = {kExprNop};
-  EXPECT_VERIFIES(&env_v_v, code);
+  EXPECT_VERIFIES(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, SetLocal0_param) {
+TEST_F(AstDecoderTest, SetLocal0_param) {
   static const byte code[] = {kExprSetLocal, 0, kExprI8Const, 0};
-  EXPECT_VERIFIES(&env_i_i, code);
+  EXPECT_VERIFIES(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, SetLocal0_local) {
+TEST_F(AstDecoderTest, SetLocal0_local) {
   byte code[] = {kExprSetLocal, 0, kExprI8Const, 0};
-  FunctionEnv env = CreateInt32FunctionEnv(sigs.i_v(), 1);
-
-  EXPECT_VERIFIES(&env, code);
+  AddLocals(kAstI32, 1);
+  EXPECT_VERIFIES(sigs.i_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, SetLocalN_local) {
+TEST_F(AstDecoderTest, SetLocalN_local) {
   for (byte i = 1; i < 8; i++) {
-    FunctionEnv env = CreateInt32FunctionEnv(sigs.i_v(), i);
+    AddLocals(kAstI32, 1);
     for (byte j = 0; j < i; j++) {
       byte code[] = {kExprSetLocal, j, kExprI8Const, i};
-      EXPECT_VERIFIES(&env, code);
+      EXPECT_VERIFIES(sigs.v_v(), code);
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, Block0) {
+TEST_F(AstDecoderTest, Block0) {
   static const byte code[] = {kExprBlock, 0};
-  EXPECT_VERIFIES(&env_v_v, code);
+  EXPECT_VERIFIES(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Block0_fallthru1) {
+TEST_F(AstDecoderTest, Block0_fallthru1) {
   static const byte code[] = {kExprBlock, 0, kExprBlock, 0};
-  EXPECT_VERIFIES(&env_v_v, code);
+  EXPECT_VERIFIES(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Block1) {
+TEST_F(AstDecoderTest, Block1) {
   static const byte code[] = {kExprBlock, 1, kExprSetLocal, 0, kExprI8Const, 0};
-  EXPECT_VERIFIES(&env_i_i, code);
+  EXPECT_VERIFIES(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Block0_fallthru2) {
+TEST_F(AstDecoderTest, Block0_fallthru2) {
   static const byte code[] = {kExprBlock, 0, kExprSetLocal, 0, kExprI8Const, 0};
-  EXPECT_VERIFIES(&env_i_i, code);
+  EXPECT_VERIFIES(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Block2) {
+TEST_F(AstDecoderTest, Block2) {
   static const byte code[] = {kExprBlock,    2,                    // --
                               kExprSetLocal, 0, kExprI8Const, 0,   // --
                               kExprSetLocal, 0, kExprI8Const, 0};  // --
-  EXPECT_VERIFIES(&env_i_i, code);
+  EXPECT_VERIFIES(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Block2_fallthru) {
+TEST_F(AstDecoderTest, Block2_fallthru) {
   static const byte code[] = {kExprBlock,    2,                   // --
                               kExprSetLocal, 0, kExprI8Const, 0,  // --
                               kExprSetLocal, 0, kExprI8Const, 0,  // --
                               kExprI8Const,  11};                 // --
-  EXPECT_VERIFIES(&env_i_i, code);
+  EXPECT_VERIFIES(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, BlockN) {
+TEST_F(AstDecoderTest, BlockN) {
   byte block[] = {kExprBlock, 2};
 
   for (size_t i = 0; i < 10; i++) {
@@ -473,106 +394,91 @@
       memcpy(code + sizeof(block) + j * sizeof(kCodeSetLocal0), kCodeSetLocal0,
              sizeof(kCodeSetLocal0));
     }
-    Verify(kSuccess, &env_v_i, code, code + total);
+    Verify(kSuccess, sigs.v_i(), code, code + total);
     free(code);
   }
 }
 
-
-TEST_F(WasmDecoderTest, BlockN_off_end) {
+TEST_F(AstDecoderTest, BlockN_off_end) {
   for (byte i = 2; i < 10; i++) {
     byte code[] = {kExprBlock, i, kExprNop};
-    EXPECT_FAILURE(&env_v_v, code);
+    EXPECT_FAILURE(sigs.v_v(), code);
   }
 }
 
-
-TEST_F(WasmDecoderTest, Block1_break) {
+TEST_F(AstDecoderTest, Block1_break) {
   static const byte code[] = {kExprBlock, 1, kExprBr, 0, kExprNop};
-  EXPECT_VERIFIES(&env_v_v, code);
+  EXPECT_VERIFIES(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Block2_break) {
+TEST_F(AstDecoderTest, Block2_break) {
   static const byte code[] = {kExprBlock, 2, kExprNop, kExprBr, 0, kExprNop};
-  EXPECT_VERIFIES(&env_v_v, code);
+  EXPECT_VERIFIES(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Block1_continue) {
+TEST_F(AstDecoderTest, Block1_continue) {
   static const byte code[] = {kExprBlock, 1, kExprBr, 1, kExprNop};
-  EXPECT_FAILURE(&env_v_v, code);
+  EXPECT_FAILURE(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Block2_continue) {
+TEST_F(AstDecoderTest, Block2_continue) {
   static const byte code[] = {kExprBlock, 2, kExprNop, kExprBr, 1, kExprNop};
-  EXPECT_FAILURE(&env_v_v, code);
+  EXPECT_FAILURE(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, ExprBlock0) {
+TEST_F(AstDecoderTest, ExprBlock0) {
   static const byte code[] = {kExprBlock, 0};
-  EXPECT_VERIFIES(&env_v_v, code);
+  EXPECT_VERIFIES(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, ExprBlock1a) {
+TEST_F(AstDecoderTest, ExprBlock1a) {
   static const byte code[] = {kExprBlock, 1, kExprI8Const, 0};
-  EXPECT_VERIFIES(&env_i_i, code);
+  EXPECT_VERIFIES(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, ExprBlock1b) {
+TEST_F(AstDecoderTest, ExprBlock1b) {
   static const byte code[] = {kExprBlock, 1, kExprI8Const, 0};
-  EXPECT_FAILURE(&env_f_ff, code);
+  EXPECT_FAILURE(sigs.f_ff(), code);
 }
 
-
-TEST_F(WasmDecoderTest, ExprBlock1c) {
+TEST_F(AstDecoderTest, ExprBlock1c) {
   static const byte code[] = {kExprBlock, 1, kExprF32Const, 0, 0, 0, 0};
-  EXPECT_VERIFIES(&env_f_ff, code);
+  EXPECT_VERIFIES(sigs.f_ff(), code);
 }
 
-
-TEST_F(WasmDecoderTest, IfEmpty) {
+TEST_F(AstDecoderTest, IfEmpty) {
   static const byte code[] = {kExprIf, kExprGetLocal, 0, kExprNop};
-  EXPECT_VERIFIES(&env_v_i, code);
+  EXPECT_VERIFIES(sigs.v_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, IfSet) {
+TEST_F(AstDecoderTest, IfSet) {
   static const byte code[] = {kExprIfElse, kExprGetLocal, 0, kExprSetLocal,
                               0,           kExprI8Const,  0, kExprNop};
-  EXPECT_VERIFIES(&env_v_i, code);
+  EXPECT_VERIFIES(sigs.v_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, IfBlock1) {
+TEST_F(AstDecoderTest, IfBlock1) {
   static const byte code[] = {kExprIfElse, kExprGetLocal, 0, kExprBlock,
                               1,           kExprSetLocal, 0, kExprI8Const,
                               0,           kExprNop};
-  EXPECT_VERIFIES(&env_v_i, code);
+  EXPECT_VERIFIES(sigs.v_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, IfBlock2) {
+TEST_F(AstDecoderTest, IfBlock2) {
   static const byte code[] = {kExprIf, kExprGetLocal, 0, kExprBlock,
                               2,       kExprSetLocal, 0, kExprI8Const,
                               0,       kExprSetLocal, 0, kExprI8Const,
                               0};
-  EXPECT_VERIFIES(&env_v_i, code);
+  EXPECT_VERIFIES(sigs.v_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, IfElseEmpty) {
+TEST_F(AstDecoderTest, IfElseEmpty) {
   static const byte code[] = {kExprIfElse, kExprGetLocal, 0, kExprNop,
                               kExprNop};
-  EXPECT_VERIFIES(&env_v_i, code);
+  EXPECT_VERIFIES(sigs.v_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, IfElseSet) {
+TEST_F(AstDecoderTest, IfElseSet) {
   static const byte code[] = {kExprIfElse,
                               kExprGetLocal,
                               0,  // --
@@ -584,218 +490,192 @@
                               0,
                               kExprI8Const,
                               1};  // --
-  EXPECT_VERIFIES(&env_v_i, code);
+  EXPECT_VERIFIES(sigs.v_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, IfElseUnreachable) {
+TEST_F(AstDecoderTest, IfElseUnreachable) {
   static const byte code[] = {kExprIfElse,      kExprI8Const,  0,
                               kExprUnreachable, kExprGetLocal, 0};
 
   for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
     LocalType types[] = {kAstI32, kLocalTypes[i]};
-    FunctionEnv env;
     FunctionSig sig(1, 1, types);
-    init_env(&env, &sig);
 
     if (kLocalTypes[i] == kAstI32) {
-      EXPECT_VERIFIES(&env, code);
+      EXPECT_VERIFIES(&sig, code);
     } else {
-      EXPECT_FAILURE(&env, code);
+      EXPECT_FAILURE(&sig, code);
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, Loop0) {
+TEST_F(AstDecoderTest, Loop0) {
   static const byte code[] = {kExprLoop, 0};
-  EXPECT_VERIFIES(&env_v_v, code);
+  EXPECT_VERIFIES(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Loop1) {
+TEST_F(AstDecoderTest, Loop1) {
   static const byte code[] = {kExprLoop, 1, kExprSetLocal, 0, kExprI8Const, 0};
-  EXPECT_VERIFIES(&env_v_i, code);
+  EXPECT_VERIFIES(sigs.v_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Loop2) {
+TEST_F(AstDecoderTest, Loop2) {
   static const byte code[] = {kExprLoop,     2,                    // --
                               kExprSetLocal, 0, kExprI8Const, 0,   // --
                               kExprSetLocal, 0, kExprI8Const, 0};  // --
-  EXPECT_VERIFIES(&env_v_i, code);
+  EXPECT_VERIFIES(sigs.v_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Loop1_continue) {
+TEST_F(AstDecoderTest, Loop1_continue) {
   static const byte code[] = {kExprLoop, 1, kExprBr, 0, kExprNop};
-  EXPECT_VERIFIES(&env_v_v, code);
+  EXPECT_VERIFIES(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Loop1_break) {
+TEST_F(AstDecoderTest, Loop1_break) {
   static const byte code[] = {kExprLoop, 1, kExprBr, 1, kExprNop};
-  EXPECT_VERIFIES(&env_v_v, code);
+  EXPECT_VERIFIES(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Loop2_continue) {
+TEST_F(AstDecoderTest, Loop2_continue) {
   static const byte code[] = {kExprLoop,     2,                   // --
                               kExprSetLocal, 0, kExprI8Const, 0,  // --
                               kExprBr,       0, kExprNop};        // --
-  EXPECT_VERIFIES(&env_v_i, code);
+  EXPECT_VERIFIES(sigs.v_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, Loop2_break) {
+TEST_F(AstDecoderTest, Loop2_break) {
   static const byte code[] = {kExprLoop,     2,                   // --
                               kExprSetLocal, 0, kExprI8Const, 0,  // --
                               kExprBr,       1, kExprNop};        // --
-  EXPECT_VERIFIES(&env_v_i, code);
+  EXPECT_VERIFIES(sigs.v_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, ExprLoop0) {
+TEST_F(AstDecoderTest, ExprLoop0) {
   static const byte code[] = {kExprLoop, 0};
-  EXPECT_VERIFIES(&env_v_v, code);
+  EXPECT_VERIFIES(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, ExprLoop1a) {
+TEST_F(AstDecoderTest, ExprLoop1a) {
   static const byte code[] = {kExprLoop, 1, kExprBr, 0, kExprI8Const, 0};
-  EXPECT_VERIFIES(&env_i_i, code);
+  EXPECT_VERIFIES(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, ExprLoop1b) {
+TEST_F(AstDecoderTest, ExprLoop1b) {
   static const byte code[] = {kExprLoop, 1, kExprBr, 0, kExprI8Const, 0};
-  EXPECT_VERIFIES(&env_i_i, code);
+  EXPECT_VERIFIES(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, ExprLoop2_unreachable) {
+TEST_F(AstDecoderTest, ExprLoop2_unreachable) {
   static const byte code[] = {kExprLoop,    2, kExprBr, 0,
                               kExprI8Const, 0, kExprNop};
-  EXPECT_VERIFIES(&env_i_i, code);
+  EXPECT_VERIFIES(sigs.i_i(), code);
 }
 
-
-TEST_F(WasmDecoderTest, ReturnVoid1) {
+TEST_F(AstDecoderTest, ReturnVoid1) {
   static const byte code[] = {kExprNop};
-  EXPECT_VERIFIES(&env_v_v, code);
-  EXPECT_FAILURE(&env_i_i, code);
-  EXPECT_FAILURE(&env_i_f, code);
+  EXPECT_VERIFIES(sigs.v_v(), code);
+  EXPECT_FAILURE(sigs.i_i(), code);
+  EXPECT_FAILURE(sigs.i_f(), code);
 }
 
-
-TEST_F(WasmDecoderTest, ReturnVoid2) {
+TEST_F(AstDecoderTest, ReturnVoid2) {
   static const byte code[] = {kExprBlock, 1, kExprBr, 0, kExprNop};
-  EXPECT_VERIFIES(&env_v_v, code);
-  EXPECT_FAILURE(&env_i_i, code);
-  EXPECT_FAILURE(&env_i_f, code);
+  EXPECT_VERIFIES(sigs.v_v(), code);
+  EXPECT_FAILURE(sigs.i_i(), code);
+  EXPECT_FAILURE(sigs.i_f(), code);
 }
 
+TEST_F(AstDecoderTest, ReturnVoid3) {
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), kExprI8Const, 0);
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), kExprI32Const, 0, 0, 0, 0);
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), kExprI64Const, 0, 0, 0, 0, 0, 0, 0, 0);
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), kExprF32Const, 0, 0, 0, 0);
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), kExprF64Const, 0, 0, 0, 0, 0, 0, 0, 0);
 
-TEST_F(WasmDecoderTest, ReturnVoid3) {
-  EXPECT_VERIFIES_INLINE(&env_v_v, kExprI8Const, 0);
-  EXPECT_VERIFIES_INLINE(&env_v_v, kExprI32Const, 0, 0, 0, 0);
-  EXPECT_VERIFIES_INLINE(&env_v_v, kExprI64Const, 0, 0, 0, 0, 0, 0, 0, 0);
-  EXPECT_VERIFIES_INLINE(&env_v_v, kExprF32Const, 0, 0, 0, 0);
-  EXPECT_VERIFIES_INLINE(&env_v_v, kExprF64Const, 0, 0, 0, 0, 0, 0, 0, 0);
-
-  EXPECT_VERIFIES_INLINE(&env_v_i, kExprGetLocal, 0);
+  EXPECT_VERIFIES_INLINE(sigs.v_i(), kExprGetLocal, 0);
 }
 
-
-TEST_F(WasmDecoderTest, Unreachable1) {
-  EXPECT_VERIFIES_INLINE(&env_v_v, kExprUnreachable);
-  EXPECT_VERIFIES_INLINE(&env_v_v, kExprUnreachable, kExprUnreachable);
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_BLOCK(2, WASM_UNREACHABLE, WASM_ZERO));
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_BLOCK(2, WASM_BR(0), WASM_ZERO));
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(2, WASM_UNREACHABLE, WASM_ZERO));
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(2, WASM_BR(0), WASM_ZERO));
+TEST_F(AstDecoderTest, Unreachable1) {
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), kExprUnreachable);
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), kExprUnreachable, kExprUnreachable);
+  EXPECT_VERIFIES_INLINE(sigs.v_v(),
+                         WASM_BLOCK(2, WASM_UNREACHABLE, WASM_ZERO));
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_BLOCK(2, WASM_BR(0), WASM_ZERO));
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_LOOP(2, WASM_UNREACHABLE, WASM_ZERO));
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_LOOP(2, WASM_BR(0), WASM_ZERO));
 }
 
-
-TEST_F(WasmDecoderTest, Codeiness) {
+TEST_F(AstDecoderTest, Codeiness) {
   VERIFY(kExprLoop, 2,                       // --
          kExprSetLocal, 0, kExprI8Const, 0,  // --
          kExprBr, 0, kExprNop);              // --
 }
 
-
-TEST_F(WasmDecoderTest, ExprIf1) {
+TEST_F(AstDecoderTest, ExprIf1) {
   VERIFY(kExprIf, kExprGetLocal, 0, kExprI8Const, 0, kExprI8Const, 1);
   VERIFY(kExprIf, kExprGetLocal, 0, kExprGetLocal, 0, kExprGetLocal, 0);
   VERIFY(kExprIf, kExprGetLocal, 0, kExprI32Add, kExprGetLocal, 0,
          kExprGetLocal, 0, kExprI8Const, 1);
 }
 
-
-TEST_F(WasmDecoderTest, ExprIf_off_end) {
+TEST_F(AstDecoderTest, ExprIf_off_end) {
   static const byte kCode[] = {kExprIf, kExprGetLocal, 0, kExprGetLocal,
                                0,       kExprGetLocal, 0};
   for (size_t len = 1; len < arraysize(kCode); len++) {
-    Verify(kError, &env_i_i, kCode, kCode + len);
+    Verify(kError, sigs.i_i(), kCode, kCode + len);
   }
 }
 
-
-TEST_F(WasmDecoderTest, ExprIf_type) {
+TEST_F(AstDecoderTest, ExprIf_type) {
   {
     // float|double ? 1 : 2
     static const byte kCode[] = {kExprIfElse, kExprGetLocal, 0, kExprI8Const,
                                  1,           kExprI8Const,  2};
-    EXPECT_FAILURE(&env_i_f, kCode);
-    EXPECT_FAILURE(&env_i_d, kCode);
+    EXPECT_FAILURE(sigs.i_f(), kCode);
+    EXPECT_FAILURE(sigs.i_d(), kCode);
   }
   {
     // 1 ? float|double : 2
     static const byte kCode[] = {kExprIfElse, kExprI8Const, 1, kExprGetLocal,
                                  0,           kExprI8Const, 2};
-    EXPECT_FAILURE(&env_i_f, kCode);
-    EXPECT_FAILURE(&env_i_d, kCode);
+    EXPECT_FAILURE(sigs.i_f(), kCode);
+    EXPECT_FAILURE(sigs.i_d(), kCode);
   }
   {
     // stmt ? 0 : 1
     static const byte kCode[] = {kExprIfElse, kExprNop,     kExprI8Const,
                                  0,           kExprI8Const, 1};
-    EXPECT_FAILURE(&env_i_i, kCode);
+    EXPECT_FAILURE(sigs.i_i(), kCode);
   }
   {
     // 0 ? stmt : 1
     static const byte kCode[] = {kExprIfElse, kExprI8Const, 0,
                                  kExprNop,    kExprI8Const, 1};
-    EXPECT_FAILURE(&env_i_i, kCode);
+    EXPECT_FAILURE(sigs.i_i(), kCode);
   }
   {
     // 0 ? 1 : stmt
     static const byte kCode[] = {kExprIfElse, kExprI8Const, 0, kExprI8Const, 1,
                                  0,           kExprBlock};
-    EXPECT_FAILURE(&env_i_i, kCode);
+    EXPECT_FAILURE(sigs.i_i(), kCode);
   }
 }
 
-
-TEST_F(WasmDecoderTest, Int64Local_param) {
-  EXPECT_VERIFIES(&env_l_l, kCodeGetLocal0);
+TEST_F(AstDecoderTest, Int64Local_param) {
+  EXPECT_VERIFIES(sigs.l_l(), kCodeGetLocal0);
 }
 
-
-TEST_F(WasmDecoderTest, Int64Locals) {
+TEST_F(AstDecoderTest, Int64Locals) {
   for (byte i = 1; i < 8; i++) {
-    FunctionEnv env;
-    init_env(&env, sigs.l_v());
-    env.AddLocals(kAstI64, i);
+    AddLocals(kAstI64, 1);
     for (byte j = 0; j < i; j++) {
       byte code[] = {kExprGetLocal, j};
-      EXPECT_VERIFIES(&env, code);
+      EXPECT_VERIFIES(sigs.l_v(), code);
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, Int32Binops) {
+TEST_F(AstDecoderTest, Int32Binops) {
   TestBinop(kExprI32Add, sigs.i_ii());
   TestBinop(kExprI32Sub, sigs.i_ii());
   TestBinop(kExprI32Mul, sigs.i_ii());
@@ -816,8 +696,7 @@
   TestBinop(kExprI32LeU, sigs.i_ii());
 }
 
-
-TEST_F(WasmDecoderTest, DoubleBinops) {
+TEST_F(AstDecoderTest, DoubleBinops) {
   TestBinop(kExprF64Add, sigs.d_dd());
   TestBinop(kExprF64Sub, sigs.d_dd());
   TestBinop(kExprF64Mul, sigs.d_dd());
@@ -828,8 +707,7 @@
   TestBinop(kExprF64Le, sigs.i_dd());
 }
 
-
-TEST_F(WasmDecoderTest, FloatBinops) {
+TEST_F(AstDecoderTest, FloatBinops) {
   TestBinop(kExprF32Add, sigs.f_ff());
   TestBinop(kExprF32Sub, sigs.f_ff());
   TestBinop(kExprF32Mul, sigs.f_ff());
@@ -840,8 +718,7 @@
   TestBinop(kExprF32Le, sigs.i_ff());
 }
 
-
-TEST_F(WasmDecoderTest, TypeConversions) {
+TEST_F(AstDecoderTest, TypeConversions) {
   TestUnop(kExprI32SConvertF32, kAstI32, kAstF32);
   TestUnop(kExprI32SConvertF64, kAstI32, kAstF64);
   TestUnop(kExprI32UConvertF32, kAstI32, kAstF32);
@@ -854,9 +731,8 @@
   TestUnop(kExprF32ConvertF64, kAstF32, kAstF64);
 }
 
-
-TEST_F(WasmDecoderTest, MacrosStmt) {
-  VERIFY(WASM_SET_LOCAL(0, WASM_I32(87348)));
+TEST_F(AstDecoderTest, MacrosStmt) {
+  VERIFY(WASM_SET_LOCAL(0, WASM_I32V_3(87348)));
   VERIFY(WASM_STORE_MEM(MachineType::Int32(), WASM_I8(24), WASM_I8(40)));
   VERIFY(WASM_IF(WASM_GET_LOCAL(0), WASM_NOP));
   VERIFY(WASM_IF_ELSE(WASM_GET_LOCAL(0), WASM_NOP, WASM_NOP));
@@ -867,33 +743,30 @@
   VERIFY(WASM_LOOP(1, WASM_CONTINUE(0)));
 }
 
+TEST_F(AstDecoderTest, MacrosBreak) {
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_LOOP(1, WASM_BREAK(0)));
 
-TEST_F(WasmDecoderTest, MacrosBreak) {
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_BREAK(0)));
-
-  EXPECT_VERIFIES_INLINE(&env_i_i, WASM_LOOP(1, WASM_BREAKV(0, WASM_ZERO)));
-  EXPECT_VERIFIES_INLINE(&env_l_l, WASM_LOOP(1, WASM_BREAKV(0, WASM_I64(0))));
-  EXPECT_VERIFIES_INLINE(&env_f_ff,
+  EXPECT_VERIFIES_INLINE(sigs.i_i(), WASM_LOOP(1, WASM_BREAKV(0, WASM_ZERO)));
+  EXPECT_VERIFIES_INLINE(sigs.l_l(),
+                         WASM_LOOP(1, WASM_BREAKV(0, WASM_I64V_1(0))));
+  EXPECT_VERIFIES_INLINE(sigs.f_ff(),
                          WASM_LOOP(1, WASM_BREAKV(0, WASM_F32(0.0))));
-  EXPECT_VERIFIES_INLINE(&env_d_dd,
+  EXPECT_VERIFIES_INLINE(sigs.d_dd(),
                          WASM_LOOP(1, WASM_BREAKV(0, WASM_F64(0.0))));
 }
 
-
-TEST_F(WasmDecoderTest, MacrosContinue) {
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_CONTINUE(0)));
+TEST_F(AstDecoderTest, MacrosContinue) {
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_LOOP(1, WASM_CONTINUE(0)));
 }
 
-
-TEST_F(WasmDecoderTest, MacrosVariadic) {
+TEST_F(AstDecoderTest, MacrosVariadic) {
   VERIFY(WASM_BLOCK(2, WASM_NOP, WASM_NOP));
   VERIFY(WASM_BLOCK(3, WASM_NOP, WASM_NOP, WASM_NOP));
   VERIFY(WASM_LOOP(2, WASM_NOP, WASM_NOP));
   VERIFY(WASM_LOOP(3, WASM_NOP, WASM_NOP, WASM_NOP));
 }
 
-
-TEST_F(WasmDecoderTest, MacrosNestedBlocks) {
+TEST_F(AstDecoderTest, MacrosNestedBlocks) {
   VERIFY(WASM_BLOCK(2, WASM_NOP, WASM_BLOCK(2, WASM_NOP, WASM_NOP)));
   VERIFY(WASM_BLOCK(3, WASM_NOP,                          // --
                     WASM_BLOCK(2, WASM_NOP, WASM_NOP),    // --
@@ -901,42 +774,31 @@
   VERIFY(WASM_BLOCK(1, WASM_BLOCK(1, WASM_BLOCK(2, WASM_NOP, WASM_NOP))));
 }
 
-
-TEST_F(WasmDecoderTest, MultipleReturn) {
+TEST_F(AstDecoderTest, MultipleReturn) {
   static LocalType kIntTypes5[] = {kAstI32, kAstI32, kAstI32, kAstI32, kAstI32};
   FunctionSig sig_ii_v(2, 0, kIntTypes5);
-  FunctionEnv env_ii_v;
-  init_env(&env_ii_v, &sig_ii_v);
-  EXPECT_VERIFIES_INLINE(&env_ii_v, WASM_RETURN(WASM_ZERO, WASM_ONE));
-  EXPECT_FAILURE_INLINE(&env_ii_v, WASM_RETURN(WASM_ZERO));
+  EXPECT_VERIFIES_INLINE(&sig_ii_v, WASM_RETURN(WASM_ZERO, WASM_ONE));
+  EXPECT_FAILURE_INLINE(&sig_ii_v, WASM_RETURN(WASM_ZERO));
 
   FunctionSig sig_iii_v(3, 0, kIntTypes5);
-  FunctionEnv env_iii_v;
-  init_env(&env_iii_v, &sig_iii_v);
-  EXPECT_VERIFIES_INLINE(&env_iii_v,
+  EXPECT_VERIFIES_INLINE(&sig_iii_v,
                          WASM_RETURN(WASM_ZERO, WASM_ONE, WASM_I8(44)));
-  EXPECT_FAILURE_INLINE(&env_iii_v, WASM_RETURN(WASM_ZERO, WASM_ONE));
+  EXPECT_FAILURE_INLINE(&sig_iii_v, WASM_RETURN(WASM_ZERO, WASM_ONE));
 }
 
-
-TEST_F(WasmDecoderTest, MultipleReturn_fallthru) {
+TEST_F(AstDecoderTest, MultipleReturn_fallthru) {
   static LocalType kIntTypes5[] = {kAstI32, kAstI32, kAstI32, kAstI32, kAstI32};
   FunctionSig sig_ii_v(2, 0, kIntTypes5);
-  FunctionEnv env_ii_v;
-  init_env(&env_ii_v, &sig_ii_v);
 
-  EXPECT_VERIFIES_INLINE(&env_ii_v, WASM_ZERO, WASM_ONE);
-  EXPECT_FAILURE_INLINE(&env_ii_v, WASM_ZERO);
+  EXPECT_VERIFIES_INLINE(&sig_ii_v, WASM_ZERO, WASM_ONE);
+  EXPECT_FAILURE_INLINE(&sig_ii_v, WASM_ZERO);
 
   FunctionSig sig_iii_v(3, 0, kIntTypes5);
-  FunctionEnv env_iii_v;
-  init_env(&env_iii_v, &sig_iii_v);
-  EXPECT_VERIFIES_INLINE(&env_iii_v, WASM_ZERO, WASM_ONE, WASM_I8(44));
-  EXPECT_FAILURE_INLINE(&env_iii_v, WASM_ZERO, WASM_ONE);
+  EXPECT_VERIFIES_INLINE(&sig_iii_v, WASM_ZERO, WASM_ONE, WASM_I8(44));
+  EXPECT_FAILURE_INLINE(&sig_iii_v, WASM_ZERO, WASM_ONE);
 }
 
-
-TEST_F(WasmDecoderTest, MacrosInt32) {
+TEST_F(AstDecoderTest, MacrosInt32) {
   VERIFY(WASM_I32_ADD(WASM_GET_LOCAL(0), WASM_I8(12)));
   VERIFY(WASM_I32_SUB(WASM_GET_LOCAL(0), WASM_I8(13)));
   VERIFY(WASM_I32_MUL(WASM_GET_LOCAL(0), WASM_I8(14)));
@@ -950,6 +812,8 @@
   VERIFY(WASM_I32_SHL(WASM_GET_LOCAL(0), WASM_I8(22)));
   VERIFY(WASM_I32_SHR(WASM_GET_LOCAL(0), WASM_I8(23)));
   VERIFY(WASM_I32_SAR(WASM_GET_LOCAL(0), WASM_I8(24)));
+  VERIFY(WASM_I32_ROR(WASM_GET_LOCAL(0), WASM_I8(24)));
+  VERIFY(WASM_I32_ROL(WASM_GET_LOCAL(0), WASM_I8(24)));
   VERIFY(WASM_I32_EQ(WASM_GET_LOCAL(0), WASM_I8(25)));
   VERIFY(WASM_I32_NE(WASM_GET_LOCAL(0), WASM_I8(25)));
 
@@ -964,47 +828,42 @@
   VERIFY(WASM_I32_GEU(WASM_GET_LOCAL(0), WASM_I8(29)));
 }
 
+TEST_F(AstDecoderTest, MacrosInt64) {
+#define VERIFY_L_LL(...) EXPECT_VERIFIES_INLINE(sigs.l_ll(), __VA_ARGS__)
+#define VERIFY_I_LL(...) EXPECT_VERIFIES_INLINE(sigs.i_ll(), __VA_ARGS__)
 
-TEST_F(WasmDecoderTest, MacrosInt64) {
-  FunctionEnv env_i_ll;
-  FunctionEnv env_l_ll;
-  init_env(&env_i_ll, sigs.i_ll());
-  init_env(&env_l_ll, sigs.l_ll());
+  VERIFY_L_LL(WASM_I64_ADD(WASM_GET_LOCAL(0), WASM_I64V_1(12)));
+  VERIFY_L_LL(WASM_I64_SUB(WASM_GET_LOCAL(0), WASM_I64V_1(13)));
+  VERIFY_L_LL(WASM_I64_MUL(WASM_GET_LOCAL(0), WASM_I64V_1(14)));
+  VERIFY_L_LL(WASM_I64_DIVS(WASM_GET_LOCAL(0), WASM_I64V_1(15)));
+  VERIFY_L_LL(WASM_I64_DIVU(WASM_GET_LOCAL(0), WASM_I64V_1(16)));
+  VERIFY_L_LL(WASM_I64_REMS(WASM_GET_LOCAL(0), WASM_I64V_1(17)));
+  VERIFY_L_LL(WASM_I64_REMU(WASM_GET_LOCAL(0), WASM_I64V_1(18)));
+  VERIFY_L_LL(WASM_I64_AND(WASM_GET_LOCAL(0), WASM_I64V_1(19)));
+  VERIFY_L_LL(WASM_I64_IOR(WASM_GET_LOCAL(0), WASM_I64V_1(20)));
+  VERIFY_L_LL(WASM_I64_XOR(WASM_GET_LOCAL(0), WASM_I64V_1(21)));
 
-#define VERIFY_L_LL(...) EXPECT_VERIFIES_INLINE(&env_l_ll, __VA_ARGS__)
-#define VERIFY_I_LL(...) EXPECT_VERIFIES_INLINE(&env_i_ll, __VA_ARGS__)
+  VERIFY_L_LL(WASM_I64_SHL(WASM_GET_LOCAL(0), WASM_I64V_1(22)));
+  VERIFY_L_LL(WASM_I64_SHR(WASM_GET_LOCAL(0), WASM_I64V_1(23)));
+  VERIFY_L_LL(WASM_I64_SAR(WASM_GET_LOCAL(0), WASM_I64V_1(24)));
+  VERIFY_L_LL(WASM_I64_ROR(WASM_GET_LOCAL(0), WASM_I64V_1(24)));
+  VERIFY_L_LL(WASM_I64_ROL(WASM_GET_LOCAL(0), WASM_I64V_1(24)));
 
-  VERIFY_L_LL(WASM_I64_ADD(WASM_GET_LOCAL(0), WASM_I64(12)));
-  VERIFY_L_LL(WASM_I64_SUB(WASM_GET_LOCAL(0), WASM_I64(13)));
-  VERIFY_L_LL(WASM_I64_MUL(WASM_GET_LOCAL(0), WASM_I64(14)));
-  VERIFY_L_LL(WASM_I64_DIVS(WASM_GET_LOCAL(0), WASM_I64(15)));
-  VERIFY_L_LL(WASM_I64_DIVU(WASM_GET_LOCAL(0), WASM_I64(16)));
-  VERIFY_L_LL(WASM_I64_REMS(WASM_GET_LOCAL(0), WASM_I64(17)));
-  VERIFY_L_LL(WASM_I64_REMU(WASM_GET_LOCAL(0), WASM_I64(18)));
-  VERIFY_L_LL(WASM_I64_AND(WASM_GET_LOCAL(0), WASM_I64(19)));
-  VERIFY_L_LL(WASM_I64_IOR(WASM_GET_LOCAL(0), WASM_I64(20)));
-  VERIFY_L_LL(WASM_I64_XOR(WASM_GET_LOCAL(0), WASM_I64(21)));
+  VERIFY_I_LL(WASM_I64_LTS(WASM_GET_LOCAL(0), WASM_I64V_1(26)));
+  VERIFY_I_LL(WASM_I64_LES(WASM_GET_LOCAL(0), WASM_I64V_1(27)));
+  VERIFY_I_LL(WASM_I64_LTU(WASM_GET_LOCAL(0), WASM_I64V_1(28)));
+  VERIFY_I_LL(WASM_I64_LEU(WASM_GET_LOCAL(0), WASM_I64V_1(29)));
 
-  VERIFY_L_LL(WASM_I64_SHL(WASM_GET_LOCAL(0), WASM_I64(22)));
-  VERIFY_L_LL(WASM_I64_SHR(WASM_GET_LOCAL(0), WASM_I64(23)));
-  VERIFY_L_LL(WASM_I64_SAR(WASM_GET_LOCAL(0), WASM_I64(24)));
+  VERIFY_I_LL(WASM_I64_GTS(WASM_GET_LOCAL(0), WASM_I64V_1(26)));
+  VERIFY_I_LL(WASM_I64_GES(WASM_GET_LOCAL(0), WASM_I64V_1(27)));
+  VERIFY_I_LL(WASM_I64_GTU(WASM_GET_LOCAL(0), WASM_I64V_1(28)));
+  VERIFY_I_LL(WASM_I64_GEU(WASM_GET_LOCAL(0), WASM_I64V_1(29)));
 
-  VERIFY_I_LL(WASM_I64_LTS(WASM_GET_LOCAL(0), WASM_I64(26)));
-  VERIFY_I_LL(WASM_I64_LES(WASM_GET_LOCAL(0), WASM_I64(27)));
-  VERIFY_I_LL(WASM_I64_LTU(WASM_GET_LOCAL(0), WASM_I64(28)));
-  VERIFY_I_LL(WASM_I64_LEU(WASM_GET_LOCAL(0), WASM_I64(29)));
-
-  VERIFY_I_LL(WASM_I64_GTS(WASM_GET_LOCAL(0), WASM_I64(26)));
-  VERIFY_I_LL(WASM_I64_GES(WASM_GET_LOCAL(0), WASM_I64(27)));
-  VERIFY_I_LL(WASM_I64_GTU(WASM_GET_LOCAL(0), WASM_I64(28)));
-  VERIFY_I_LL(WASM_I64_GEU(WASM_GET_LOCAL(0), WASM_I64(29)));
-
-  VERIFY_I_LL(WASM_I64_EQ(WASM_GET_LOCAL(0), WASM_I64(25)));
-  VERIFY_I_LL(WASM_I64_NE(WASM_GET_LOCAL(0), WASM_I64(25)));
+  VERIFY_I_LL(WASM_I64_EQ(WASM_GET_LOCAL(0), WASM_I64V_1(25)));
+  VERIFY_I_LL(WASM_I64_NE(WASM_GET_LOCAL(0), WASM_I64V_1(25)));
 }
 
-
-TEST_F(WasmDecoderTest, AllSimpleExpressions) {
+TEST_F(AstDecoderTest, AllSimpleExpressions) {
 // Test all simple expressions which are described by a signature.
 #define DECODE_TEST(name, opcode, sig)                      \
   {                                                         \
@@ -1021,86 +880,55 @@
 #undef DECODE_TEST
 }
 
-
-TEST_F(WasmDecoderTest, MemorySize) {
+TEST_F(AstDecoderTest, MemorySize) {
   byte code[] = {kExprMemorySize};
-  EXPECT_VERIFIES(&env_i_i, code);
-  EXPECT_FAILURE(&env_f_ff, code);
+  EXPECT_VERIFIES(sigs.i_i(), code);
+  EXPECT_FAILURE(sigs.f_ff(), code);
 }
 
-
-TEST_F(WasmDecoderTest, GrowMemory) {
+TEST_F(AstDecoderTest, GrowMemory) {
   byte code[] = {kExprGrowMemory, kExprGetLocal, 0};
-  EXPECT_VERIFIES(&env_i_i, code);
-  EXPECT_FAILURE(&env_i_d, code);
+  EXPECT_VERIFIES(sigs.i_i(), code);
+  EXPECT_FAILURE(sigs.i_d(), code);
 }
 
-
-TEST_F(WasmDecoderTest, LoadMemOffset) {
+TEST_F(AstDecoderTest, LoadMemOffset) {
   for (int offset = 0; offset < 128; offset += 7) {
-    byte code[] = {kExprI32LoadMem, WasmOpcodes::LoadStoreAccessOf(true),
-                   static_cast<byte>(offset), kExprI8Const, 0};
-    EXPECT_VERIFIES(&env_i_i, code);
+    byte code[] = {kExprI32LoadMem, ZERO_ALIGNMENT, static_cast<byte>(offset),
+                   kExprI8Const, 0};
+    EXPECT_VERIFIES(sigs.i_i(), code);
   }
 }
 
-
-TEST_F(WasmDecoderTest, StoreMemOffset) {
+TEST_F(AstDecoderTest, StoreMemOffset) {
   for (int offset = 0; offset < 128; offset += 7) {
-    byte code[] = {kExprI32StoreMem,
-                   WasmOpcodes::LoadStoreAccessOf(true),
-                   static_cast<byte>(offset),
-                   kExprI8Const,
-                   0,
-                   kExprI8Const,
-                   0};
-    EXPECT_VERIFIES(&env_i_i, code);
+    byte code[] = {
+        kExprI32StoreMem, 0, static_cast<byte>(offset), kExprI8Const, 0,
+        kExprI8Const,     0};
+    EXPECT_VERIFIES(sigs.i_i(), code);
   }
 }
 
+TEST_F(AstDecoderTest, LoadMemOffset_varint) {
+  byte code1[] = {kExprI32LoadMem, ZERO_ALIGNMENT, ZERO_OFFSET, kExprI8Const,
+                  0};
+  byte code2[] = {kExprI32LoadMem, ZERO_ALIGNMENT, 0x80, 1, kExprI8Const, 0};
+  byte code3[] = {
+      kExprI32LoadMem, ZERO_ALIGNMENT, 0x81, 0x82, 5, kExprI8Const, 0};
+  byte code4[] = {
+      kExprI32LoadMem, ZERO_ALIGNMENT, 0x83, 0x84, 0x85, 7, kExprI8Const, 0};
 
-TEST_F(WasmDecoderTest, LoadMemOffset_varint) {
-  byte code1[] = {kExprI32LoadMem, WasmOpcodes::LoadStoreAccessOf(true), 0,
-                  kExprI8Const, 0};
-  byte code2[] = {kExprI32LoadMem,
-                  WasmOpcodes::LoadStoreAccessOf(true),
-                  0x80,
-                  1,
-                  kExprI8Const,
-                  0};
-  byte code3[] = {kExprI32LoadMem,
-                  WasmOpcodes::LoadStoreAccessOf(true),
-                  0x81,
-                  0x82,
-                  5,
-                  kExprI8Const,
-                  0};
-  byte code4[] = {kExprI32LoadMem,
-                  WasmOpcodes::LoadStoreAccessOf(true),
-                  0x83,
-                  0x84,
-                  0x85,
-                  7,
-                  kExprI8Const,
-                  0};
-
-  EXPECT_VERIFIES(&env_i_i, code1);
-  EXPECT_VERIFIES(&env_i_i, code2);
-  EXPECT_VERIFIES(&env_i_i, code3);
-  EXPECT_VERIFIES(&env_i_i, code4);
+  EXPECT_VERIFIES(sigs.i_i(), code1);
+  EXPECT_VERIFIES(sigs.i_i(), code2);
+  EXPECT_VERIFIES(sigs.i_i(), code3);
+  EXPECT_VERIFIES(sigs.i_i(), code4);
 }
 
-
-TEST_F(WasmDecoderTest, StoreMemOffset_varint) {
-  byte code1[] = {kExprI32StoreMem,
-                  WasmOpcodes::LoadStoreAccessOf(true),
-                  0,
-                  kExprI8Const,
-                  0,
-                  kExprI8Const,
-                  0};
+TEST_F(AstDecoderTest, StoreMemOffset_varint) {
+  byte code1[] = {
+      kExprI32StoreMem, ZERO_ALIGNMENT, 0, kExprI8Const, 0, kExprI8Const, 0};
   byte code2[] = {kExprI32StoreMem,
-                  WasmOpcodes::LoadStoreAccessOf(true),
+                  ZERO_ALIGNMENT,
                   0x80,
                   1,
                   kExprI8Const,
@@ -1108,7 +936,7 @@
                   kExprI8Const,
                   0};
   byte code3[] = {kExprI32StoreMem,
-                  WasmOpcodes::LoadStoreAccessOf(true),
+                  ZERO_ALIGNMENT,
                   0x81,
                   0x82,
                   5,
@@ -1117,7 +945,7 @@
                   kExprI8Const,
                   0};
   byte code4[] = {kExprI32StoreMem,
-                  WasmOpcodes::LoadStoreAccessOf(true),
+                  ZERO_ALIGNMENT,
                   0x83,
                   0x84,
                   0x85,
@@ -1127,53 +955,48 @@
                   kExprI8Const,
                   0};
 
-  EXPECT_VERIFIES(&env_i_i, code1);
-  EXPECT_VERIFIES(&env_i_i, code2);
-  EXPECT_VERIFIES(&env_i_i, code3);
-  EXPECT_VERIFIES(&env_i_i, code4);
+  EXPECT_VERIFIES(sigs.i_i(), code1);
+  EXPECT_VERIFIES(sigs.i_i(), code2);
+  EXPECT_VERIFIES(sigs.i_i(), code3);
+  EXPECT_VERIFIES(sigs.i_i(), code4);
 }
 
-
-TEST_F(WasmDecoderTest, AllLoadMemCombinations) {
+TEST_F(AstDecoderTest, AllLoadMemCombinations) {
   for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
     LocalType local_type = kLocalTypes[i];
     for (size_t j = 0; j < arraysize(machineTypes); j++) {
       MachineType mem_type = machineTypes[j];
       byte code[] = {
           static_cast<byte>(WasmOpcodes::LoadStoreOpcodeOf(mem_type, false)),
-          WasmOpcodes::LoadStoreAccessOf(false), kExprI8Const, 0};
-      FunctionEnv env;
+          ZERO_ALIGNMENT, ZERO_OFFSET, kExprI8Const, 0};
       FunctionSig sig(1, 0, &local_type);
-      init_env(&env, &sig);
       if (local_type == WasmOpcodes::LocalTypeFor(mem_type)) {
-        EXPECT_VERIFIES(&env, code);
+        EXPECT_VERIFIES(&sig, code);
       } else {
-        EXPECT_FAILURE(&env, code);
+        EXPECT_FAILURE(&sig, code);
       }
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, AllStoreMemCombinations) {
+TEST_F(AstDecoderTest, AllStoreMemCombinations) {
   for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
     LocalType local_type = kLocalTypes[i];
     for (size_t j = 0; j < arraysize(machineTypes); j++) {
       MachineType mem_type = machineTypes[j];
       byte code[] = {
           static_cast<byte>(WasmOpcodes::LoadStoreOpcodeOf(mem_type, true)),
-          WasmOpcodes::LoadStoreAccessOf(false),
+          ZERO_ALIGNMENT,
+          ZERO_OFFSET,
           kExprI8Const,
           0,
           kExprGetLocal,
           0};
-      FunctionEnv env;
       FunctionSig sig(0, 1, &local_type);
-      init_env(&env, &sig);
       if (local_type == WasmOpcodes::LocalTypeFor(mem_type)) {
-        EXPECT_VERIFIES(&env, code);
+        EXPECT_VERIFIES(&sig, code);
       } else {
-        EXPECT_FAILURE(&env, code);
+        EXPECT_FAILURE(&sig, code);
       }
     }
   }
@@ -1189,30 +1012,26 @@
     instance = nullptr;
     module = &mod;
     linker = nullptr;
-    mod.globals = new std::vector<WasmGlobal>;
-    mod.signatures = new std::vector<FunctionSig*>;
-    mod.functions = new std::vector<WasmFunction>;
-    mod.import_table = new std::vector<WasmImport>;
   }
   byte AddGlobal(MachineType mem_type) {
-    mod.globals->push_back({0, mem_type, 0, false});
-    CHECK(mod.globals->size() <= 127);
-    return static_cast<byte>(mod.globals->size() - 1);
+    mod.globals.push_back({0, 0, mem_type, 0, false});
+    CHECK(mod.globals.size() <= 127);
+    return static_cast<byte>(mod.globals.size() - 1);
   }
   byte AddSignature(FunctionSig* sig) {
-    mod.signatures->push_back(sig);
-    CHECK(mod.signatures->size() <= 127);
-    return static_cast<byte>(mod.signatures->size() - 1);
+    mod.signatures.push_back(sig);
+    CHECK(mod.signatures.size() <= 127);
+    return static_cast<byte>(mod.signatures.size() - 1);
   }
   byte AddFunction(FunctionSig* sig) {
-    mod.functions->push_back({sig, 0, 0, 0, 0, 0, 0, 0, false, false});
-    CHECK(mod.functions->size() <= 127);
-    return static_cast<byte>(mod.functions->size() - 1);
+    mod.functions.push_back({sig, 0, 0, 0, 0, 0, 0, 0, false, false});
+    CHECK(mod.functions.size() <= 127);
+    return static_cast<byte>(mod.functions.size() - 1);
   }
   byte AddImport(FunctionSig* sig) {
-    mod.import_table->push_back({sig, 0, 0});
-    CHECK(mod.import_table->size() <= 127);
-    return static_cast<byte>(mod.import_table->size() - 1);
+    mod.import_table.push_back({sig, 0, 0});
+    CHECK(mod.import_table.size() <= 127);
+    return static_cast<byte>(mod.import_table.size() - 1);
   }
 
  private:
@@ -1220,194 +1039,184 @@
 };
 }  // namespace
 
-
-TEST_F(WasmDecoderTest, SimpleCalls) {
-  FunctionEnv* env = &env_i_i;
+TEST_F(AstDecoderTest, SimpleCalls) {
+  FunctionSig* sig = sigs.i_i();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   module_env.AddFunction(sigs.i_v());
   module_env.AddFunction(sigs.i_i());
   module_env.AddFunction(sigs.i_ii());
 
-  EXPECT_VERIFIES_INLINE(env, WASM_CALL_FUNCTION(0));
-  EXPECT_VERIFIES_INLINE(env, WASM_CALL_FUNCTION(1, WASM_I8(27)));
-  EXPECT_VERIFIES_INLINE(env, WASM_CALL_FUNCTION(2, WASM_I8(37), WASM_I8(77)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_CALL_FUNCTION(0));
+  EXPECT_VERIFIES_INLINE(sig, WASM_CALL_FUNCTION(1, WASM_I8(27)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_CALL_FUNCTION(2, WASM_I8(37), WASM_I8(77)));
 }
 
-
-TEST_F(WasmDecoderTest, CallsWithTooFewArguments) {
-  FunctionEnv* env = &env_i_i;
+TEST_F(AstDecoderTest, CallsWithTooFewArguments) {
+  FunctionSig* sig = sigs.i_i();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   module_env.AddFunction(sigs.i_i());
   module_env.AddFunction(sigs.i_ii());
   module_env.AddFunction(sigs.f_ff());
 
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION0(0));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(1, WASM_ZERO));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(2, WASM_GET_LOCAL(0)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_FUNCTION0(0));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_FUNCTION(1, WASM_ZERO));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_FUNCTION(2, WASM_GET_LOCAL(0)));
 }
 
-
-TEST_F(WasmDecoderTest, CallsWithSpilloverArgs) {
+TEST_F(AstDecoderTest, CallsWithSpilloverArgs) {
   static LocalType a_i_ff[] = {kAstI32, kAstF32, kAstF32};
   FunctionSig sig_i_ff(1, 2, a_i_ff);
-  FunctionEnv env_i_ff;
-  init_env(&env_i_ff, &sig_i_ff);
 
   TestModuleEnv module_env;
-  env_i_ff.module = &module_env;
-  env_i_i.module = &module_env;
-  env_f_ff.module = &module_env;
+  module = &module_env;
 
   module_env.AddFunction(&sig_i_ff);
 
-  EXPECT_VERIFIES_INLINE(&env_i_i,
+  EXPECT_VERIFIES_INLINE(sigs.i_i(),
                          WASM_CALL_FUNCTION(0, WASM_F32(0.1), WASM_F32(0.1)));
 
-  EXPECT_VERIFIES_INLINE(&env_i_ff,
+  EXPECT_VERIFIES_INLINE(sigs.i_ff(),
                          WASM_CALL_FUNCTION(0, WASM_F32(0.1), WASM_F32(0.1)));
 
-  EXPECT_FAILURE_INLINE(&env_f_ff,
+  EXPECT_FAILURE_INLINE(sigs.f_ff(),
                         WASM_CALL_FUNCTION(0, WASM_F32(0.1), WASM_F32(0.1)));
 
   EXPECT_FAILURE_INLINE(
-      &env_i_i,
+      sigs.i_i(),
       WASM_CALL_FUNCTION(0, WASM_F32(0.1), WASM_F32(0.1), WASM_F32(0.2)));
 
   EXPECT_VERIFIES_INLINE(
-      &env_f_ff,
+      sigs.f_ff(),
       WASM_CALL_FUNCTION(0, WASM_F32(0.1), WASM_F32(0.1), WASM_F32(11)));
 }
 
-
-TEST_F(WasmDecoderTest, CallsWithMismatchedSigs2) {
-  FunctionEnv* env = &env_i_i;
+TEST_F(AstDecoderTest, CallsWithMismatchedSigs2) {
+  FunctionSig* sig = sigs.i_i();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   module_env.AddFunction(sigs.i_i());
 
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(0, WASM_I64(17)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(0, WASM_F32(17.1)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(0, WASM_F64(17.1)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_FUNCTION(0, WASM_I64V_1(17)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_FUNCTION(0, WASM_F32(17.1)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_FUNCTION(0, WASM_F64(17.1)));
 }
 
-
-TEST_F(WasmDecoderTest, CallsWithMismatchedSigs3) {
-  FunctionEnv* env = &env_i_i;
+TEST_F(AstDecoderTest, CallsWithMismatchedSigs3) {
+  FunctionSig* sig = sigs.i_i();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   module_env.AddFunction(sigs.i_f());
 
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(0, WASM_I8(17)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(0, WASM_I64(27)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(0, WASM_F64(37.2)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_FUNCTION(0, WASM_I8(17)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_FUNCTION(0, WASM_I64V_1(27)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_FUNCTION(0, WASM_F64(37.2)));
 
   module_env.AddFunction(sigs.i_d());
 
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(1, WASM_I8(16)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(1, WASM_I64(16)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(1, WASM_F32(17.6)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_FUNCTION(1, WASM_I8(16)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_FUNCTION(1, WASM_I64V_1(16)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_FUNCTION(1, WASM_F32(17.6)));
 }
 
-
-TEST_F(WasmDecoderTest, SimpleIndirectCalls) {
-  FunctionEnv* env = &env_i_i;
+TEST_F(AstDecoderTest, SimpleIndirectCalls) {
+  FunctionSig* sig = sigs.i_i();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   byte f0 = module_env.AddSignature(sigs.i_v());
   byte f1 = module_env.AddSignature(sigs.i_i());
   byte f2 = module_env.AddSignature(sigs.i_ii());
 
-  EXPECT_VERIFIES_INLINE(env, WASM_CALL_INDIRECT0(f0, WASM_ZERO));
-  EXPECT_VERIFIES_INLINE(env, WASM_CALL_INDIRECT(f1, WASM_ZERO, WASM_I8(22)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_CALL_INDIRECT0(f0, WASM_ZERO));
+  EXPECT_VERIFIES_INLINE(sig, WASM_CALL_INDIRECT(f1, WASM_ZERO, WASM_I8(22)));
   EXPECT_VERIFIES_INLINE(
-      env, WASM_CALL_INDIRECT(f2, WASM_ZERO, WASM_I8(32), WASM_I8(72)));
+      sig, WASM_CALL_INDIRECT(f2, WASM_ZERO, WASM_I8(32), WASM_I8(72)));
 }
 
-
-TEST_F(WasmDecoderTest, IndirectCallsOutOfBounds) {
-  FunctionEnv* env = &env_i_i;
+TEST_F(AstDecoderTest, IndirectCallsOutOfBounds) {
+  FunctionSig* sig = sigs.i_i();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT0(0, WASM_ZERO));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_INDIRECT0(0, WASM_ZERO));
   module_env.AddSignature(sigs.i_v());
-  EXPECT_VERIFIES_INLINE(env, WASM_CALL_INDIRECT0(0, WASM_ZERO));
+  EXPECT_VERIFIES_INLINE(sig, WASM_CALL_INDIRECT0(0, WASM_ZERO));
 
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(1, WASM_ZERO, WASM_I8(22)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_INDIRECT(1, WASM_ZERO, WASM_I8(22)));
   module_env.AddSignature(sigs.i_i());
-  EXPECT_VERIFIES_INLINE(env, WASM_CALL_INDIRECT(1, WASM_ZERO, WASM_I8(27)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_CALL_INDIRECT(1, WASM_ZERO, WASM_I8(27)));
 
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(2, WASM_ZERO, WASM_I8(27)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_INDIRECT(2, WASM_ZERO, WASM_I8(27)));
 }
 
-
-TEST_F(WasmDecoderTest, IndirectCallsWithMismatchedSigs3) {
-  FunctionEnv* env = &env_i_i;
+TEST_F(AstDecoderTest, IndirectCallsWithMismatchedSigs3) {
+  FunctionSig* sig = sigs.i_i();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   byte f0 = module_env.AddFunction(sigs.i_f());
 
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(f0, WASM_ZERO, WASM_I8(17)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(f0, WASM_ZERO, WASM_I64(27)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(f0, WASM_ZERO, WASM_F64(37.2)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_INDIRECT(f0, WASM_ZERO, WASM_I8(17)));
+  EXPECT_FAILURE_INLINE(sig,
+                        WASM_CALL_INDIRECT(f0, WASM_ZERO, WASM_I64V_1(27)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_INDIRECT(f0, WASM_ZERO, WASM_F64(37.2)));
 
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT0(f0, WASM_I8(17)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT0(f0, WASM_I64(27)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT0(f0, WASM_F64(37.2)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_INDIRECT0(f0, WASM_I8(17)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_INDIRECT0(f0, WASM_I64V_1(27)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_INDIRECT0(f0, WASM_F64(37.2)));
 
   byte f1 = module_env.AddFunction(sigs.i_d());
 
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(f1, WASM_ZERO, WASM_I8(16)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(f1, WASM_ZERO, WASM_I64(16)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(f1, WASM_ZERO, WASM_F32(17.6)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_INDIRECT(f1, WASM_ZERO, WASM_I8(16)));
+  EXPECT_FAILURE_INLINE(sig,
+                        WASM_CALL_INDIRECT(f1, WASM_ZERO, WASM_I64V_1(16)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_INDIRECT(f1, WASM_ZERO, WASM_F32(17.6)));
 }
 
-TEST_F(WasmDecoderTest, SimpleImportCalls) {
-  FunctionEnv* env = &env_i_i;
+TEST_F(AstDecoderTest, SimpleImportCalls) {
+  FunctionSig* sig = sigs.i_i();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   byte f0 = module_env.AddImport(sigs.i_v());
   byte f1 = module_env.AddImport(sigs.i_i());
   byte f2 = module_env.AddImport(sigs.i_ii());
 
-  EXPECT_VERIFIES_INLINE(env, WASM_CALL_IMPORT0(f0));
-  EXPECT_VERIFIES_INLINE(env, WASM_CALL_IMPORT(f1, WASM_I8(22)));
-  EXPECT_VERIFIES_INLINE(env, WASM_CALL_IMPORT(f2, WASM_I8(32), WASM_I8(72)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_CALL_IMPORT0(f0));
+  EXPECT_VERIFIES_INLINE(sig, WASM_CALL_IMPORT(f1, WASM_I8(22)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_CALL_IMPORT(f2, WASM_I8(32), WASM_I8(72)));
 }
 
-TEST_F(WasmDecoderTest, ImportCallsWithMismatchedSigs3) {
-  FunctionEnv* env = &env_i_i;
+TEST_F(AstDecoderTest, ImportCallsWithMismatchedSigs3) {
+  FunctionSig* sig = sigs.i_i();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   byte f0 = module_env.AddImport(sigs.i_f());
 
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT0(f0));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT(f0, WASM_I8(17)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT(f0, WASM_I64(27)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT(f0, WASM_F64(37.2)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_IMPORT0(f0));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_IMPORT(f0, WASM_I8(17)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_IMPORT(f0, WASM_I64V_1(27)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_IMPORT(f0, WASM_F64(37.2)));
 
   byte f1 = module_env.AddImport(sigs.i_d());
 
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT0(f1));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT(f1, WASM_I8(16)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT(f1, WASM_I64(16)));
-  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT(f1, WASM_F32(17.6)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_IMPORT0(f1));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_IMPORT(f1, WASM_I8(16)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_IMPORT(f1, WASM_I64V_1(16)));
+  EXPECT_FAILURE_INLINE(sig, WASM_CALL_IMPORT(f1, WASM_F32(17.6)));
 }
 
-TEST_F(WasmDecoderTest, Int32Globals) {
-  FunctionEnv* env = &env_i_i;
+TEST_F(AstDecoderTest, Int32Globals) {
+  FunctionSig* sig = sigs.i_i();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   module_env.AddGlobal(MachineType::Int8());
   module_env.AddGlobal(MachineType::Uint8());
@@ -1416,131 +1225,116 @@
   module_env.AddGlobal(MachineType::Int32());
   module_env.AddGlobal(MachineType::Uint32());
 
-  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(0));
-  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(1));
-  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(2));
-  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(3));
-  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(4));
-  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(5));
+  EXPECT_VERIFIES_INLINE(sig, WASM_LOAD_GLOBAL(0));
+  EXPECT_VERIFIES_INLINE(sig, WASM_LOAD_GLOBAL(1));
+  EXPECT_VERIFIES_INLINE(sig, WASM_LOAD_GLOBAL(2));
+  EXPECT_VERIFIES_INLINE(sig, WASM_LOAD_GLOBAL(3));
+  EXPECT_VERIFIES_INLINE(sig, WASM_LOAD_GLOBAL(4));
+  EXPECT_VERIFIES_INLINE(sig, WASM_LOAD_GLOBAL(5));
 
-  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
-  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(1, WASM_GET_LOCAL(0)));
-  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(2, WASM_GET_LOCAL(0)));
-  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(3, WASM_GET_LOCAL(0)));
-  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(4, WASM_GET_LOCAL(0)));
-  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(5, WASM_GET_LOCAL(0)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_STORE_GLOBAL(1, WASM_GET_LOCAL(0)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_STORE_GLOBAL(2, WASM_GET_LOCAL(0)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_STORE_GLOBAL(3, WASM_GET_LOCAL(0)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_STORE_GLOBAL(4, WASM_GET_LOCAL(0)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_STORE_GLOBAL(5, WASM_GET_LOCAL(0)));
 }
 
-
-TEST_F(WasmDecoderTest, Int32Globals_fail) {
-  FunctionEnv* env = &env_i_i;
+TEST_F(AstDecoderTest, Int32Globals_fail) {
+  FunctionSig* sig = sigs.i_i();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   module_env.AddGlobal(MachineType::Int64());
   module_env.AddGlobal(MachineType::Uint64());
   module_env.AddGlobal(MachineType::Float32());
   module_env.AddGlobal(MachineType::Float64());
 
-  EXPECT_FAILURE_INLINE(env, WASM_LOAD_GLOBAL(0));
-  EXPECT_FAILURE_INLINE(env, WASM_LOAD_GLOBAL(1));
-  EXPECT_FAILURE_INLINE(env, WASM_LOAD_GLOBAL(2));
-  EXPECT_FAILURE_INLINE(env, WASM_LOAD_GLOBAL(3));
+  EXPECT_FAILURE_INLINE(sig, WASM_LOAD_GLOBAL(0));
+  EXPECT_FAILURE_INLINE(sig, WASM_LOAD_GLOBAL(1));
+  EXPECT_FAILURE_INLINE(sig, WASM_LOAD_GLOBAL(2));
+  EXPECT_FAILURE_INLINE(sig, WASM_LOAD_GLOBAL(3));
 
-  EXPECT_FAILURE_INLINE(env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
-  EXPECT_FAILURE_INLINE(env, WASM_STORE_GLOBAL(1, WASM_GET_LOCAL(0)));
-  EXPECT_FAILURE_INLINE(env, WASM_STORE_GLOBAL(2, WASM_GET_LOCAL(0)));
-  EXPECT_FAILURE_INLINE(env, WASM_STORE_GLOBAL(3, WASM_GET_LOCAL(0)));
+  EXPECT_FAILURE_INLINE(sig, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
+  EXPECT_FAILURE_INLINE(sig, WASM_STORE_GLOBAL(1, WASM_GET_LOCAL(0)));
+  EXPECT_FAILURE_INLINE(sig, WASM_STORE_GLOBAL(2, WASM_GET_LOCAL(0)));
+  EXPECT_FAILURE_INLINE(sig, WASM_STORE_GLOBAL(3, WASM_GET_LOCAL(0)));
 }
 
-
-TEST_F(WasmDecoderTest, Int64Globals) {
-  FunctionEnv* env = &env_l_l;
+TEST_F(AstDecoderTest, Int64Globals) {
+  FunctionSig* sig = sigs.l_l();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   module_env.AddGlobal(MachineType::Int64());
   module_env.AddGlobal(MachineType::Uint64());
 
-  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(0));
-  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(1));
+  EXPECT_VERIFIES_INLINE(sig, WASM_LOAD_GLOBAL(0));
+  EXPECT_VERIFIES_INLINE(sig, WASM_LOAD_GLOBAL(1));
 
-  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
-  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(1, WASM_GET_LOCAL(0)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_STORE_GLOBAL(1, WASM_GET_LOCAL(0)));
 }
 
-
-TEST_F(WasmDecoderTest, Float32Globals) {
-  FunctionEnv env_f_ff;
-  FunctionEnv* env = &env_f_ff;
-  init_env(env, sigs.f_ff());
+TEST_F(AstDecoderTest, Float32Globals) {
+  FunctionSig* sig = sigs.f_ff();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   module_env.AddGlobal(MachineType::Float32());
 
-  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(0));
-  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_LOAD_GLOBAL(0));
+  EXPECT_VERIFIES_INLINE(sig, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
 }
 
-
-TEST_F(WasmDecoderTest, Float64Globals) {
-  FunctionEnv env_d_dd;
-  FunctionEnv* env = &env_d_dd;
-  init_env(env, sigs.d_dd());
+TEST_F(AstDecoderTest, Float64Globals) {
+  FunctionSig* sig = sigs.d_dd();
   TestModuleEnv module_env;
-  env->module = &module_env;
+  module = &module_env;
 
   module_env.AddGlobal(MachineType::Float64());
 
-  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(0));
-  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
+  EXPECT_VERIFIES_INLINE(sig, WASM_LOAD_GLOBAL(0));
+  EXPECT_VERIFIES_INLINE(sig, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
 }
 
-
-TEST_F(WasmDecoderTest, AllLoadGlobalCombinations) {
+TEST_F(AstDecoderTest, AllLoadGlobalCombinations) {
   for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
     LocalType local_type = kLocalTypes[i];
     for (size_t j = 0; j < arraysize(machineTypes); j++) {
       MachineType mem_type = machineTypes[j];
-      FunctionEnv env;
       FunctionSig sig(1, 0, &local_type);
       TestModuleEnv module_env;
-      init_env(&env, &sig);
-      env.module = &module_env;
+      module = &module_env;
       module_env.AddGlobal(mem_type);
       if (local_type == WasmOpcodes::LocalTypeFor(mem_type)) {
-        EXPECT_VERIFIES_INLINE(&env, WASM_LOAD_GLOBAL(0));
+        EXPECT_VERIFIES_INLINE(&sig, WASM_LOAD_GLOBAL(0));
       } else {
-        EXPECT_FAILURE_INLINE(&env, WASM_LOAD_GLOBAL(0));
+        EXPECT_FAILURE_INLINE(&sig, WASM_LOAD_GLOBAL(0));
       }
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, AllStoreGlobalCombinations) {
+TEST_F(AstDecoderTest, AllStoreGlobalCombinations) {
   for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
     LocalType local_type = kLocalTypes[i];
     for (size_t j = 0; j < arraysize(machineTypes); j++) {
       MachineType mem_type = machineTypes[j];
-      FunctionEnv env;
       FunctionSig sig(0, 1, &local_type);
       TestModuleEnv module_env;
-      init_env(&env, &sig);
-      env.module = &module_env;
+      module = &module_env;
       module_env.AddGlobal(mem_type);
       if (local_type == WasmOpcodes::LocalTypeFor(mem_type)) {
-        EXPECT_VERIFIES_INLINE(&env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
+        EXPECT_VERIFIES_INLINE(&sig, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
       } else {
-        EXPECT_FAILURE_INLINE(&env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
+        EXPECT_FAILURE_INLINE(&sig, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
       }
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, BreakNesting1) {
+TEST_F(AstDecoderTest, BreakNesting1) {
   for (int i = 0; i < 5; i++) {
     // (block[2] (loop[2] (if (get p) break[N]) (set p 1)) p)
     byte code[] = {WASM_BLOCK(
@@ -1548,65 +1342,60 @@
                      WASM_SET_LOCAL(0, WASM_I8(1))),
         WASM_GET_LOCAL(0))};
     if (i < 3) {
-      EXPECT_VERIFIES(&env_i_i, code);
+      EXPECT_VERIFIES(sigs.i_i(), code);
     } else {
-      EXPECT_FAILURE(&env_i_i, code);
+      EXPECT_FAILURE(sigs.i_i(), code);
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, BreakNesting2) {
-  env_v_v.AddLocals(kAstI32, 1);
+TEST_F(AstDecoderTest, BreakNesting2) {
+  AddLocals(kAstI32, 1);
   for (int i = 0; i < 5; i++) {
-    // (block[2] (loop[2] (if (get p) break[N]) (set p 1)) (return p)) (11)
-    byte code[] = {
-        WASM_BLOCK(1, WASM_LOOP(2, WASM_IF(WASM_GET_LOCAL(0), WASM_BREAK(i)),
-                                WASM_SET_LOCAL(0, WASM_I8(1)))),
-        WASM_I8(11)};
+    // (block[2] (loop[2] (if 0 break[N]) (set p 1)) (return p)) (11)
+    byte code[] = {WASM_BLOCK(1, WASM_LOOP(2, WASM_IF(WASM_ZERO, WASM_BREAK(i)),
+                                           WASM_SET_LOCAL(0, WASM_I8(1)))),
+                   WASM_I8(11)};
     if (i < 2) {
-      EXPECT_VERIFIES(&env_v_v, code);
+      EXPECT_VERIFIES(sigs.v_v(), code);
     } else {
-      EXPECT_FAILURE(&env_v_v, code);
+      EXPECT_FAILURE(sigs.v_v(), code);
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, BreakNesting3) {
-  env_v_v.AddLocals(kAstI32, 1);
+TEST_F(AstDecoderTest, BreakNesting3) {
   for (int i = 0; i < 5; i++) {
-    // (block[1] (loop[1] (block[1] (if (get p) break[N])
+    // (block[1] (loop[1] (block[1] (if 0 break[N])
     byte code[] = {WASM_BLOCK(
-        1, WASM_LOOP(
-               1, WASM_BLOCK(1, WASM_IF(WASM_GET_LOCAL(0), WASM_BREAK(i)))))};
+        1, WASM_LOOP(1, WASM_BLOCK(1, WASM_IF(WASM_ZERO, WASM_BREAK(i)))))};
     if (i < 3) {
-      EXPECT_VERIFIES(&env_v_v, code);
+      EXPECT_VERIFIES(sigs.v_v(), code);
     } else {
-      EXPECT_FAILURE(&env_v_v, code);
+      EXPECT_FAILURE(sigs.v_v(), code);
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, BreaksWithMultipleTypes) {
+TEST_F(AstDecoderTest, BreaksWithMultipleTypes) {
   EXPECT_FAILURE_INLINE(
-      &env_i_i, WASM_BLOCK(2, WASM_BRV_IF_ZERO(0, WASM_I8(7)), WASM_F32(7.7)));
+      sigs.i_i(),
+      WASM_BLOCK(2, WASM_BRV_IF_ZERO(0, WASM_I8(7)), WASM_F32(7.7)));
 
-  EXPECT_FAILURE_INLINE(&env_i_i,
+  EXPECT_FAILURE_INLINE(sigs.i_i(),
                         WASM_BLOCK(2, WASM_BRV_IF_ZERO(0, WASM_I8(7)),
                                    WASM_BRV_IF_ZERO(0, WASM_F32(7.7))));
-  EXPECT_FAILURE_INLINE(&env_i_i,
+  EXPECT_FAILURE_INLINE(sigs.i_i(),
                         WASM_BLOCK(3, WASM_BRV_IF_ZERO(0, WASM_I8(8)),
                                    WASM_BRV_IF_ZERO(0, WASM_I8(0)),
                                    WASM_BRV_IF_ZERO(0, WASM_F32(7.7))));
-  EXPECT_FAILURE_INLINE(&env_i_i, WASM_BLOCK(3, WASM_BRV_IF_ZERO(0, WASM_I8(9)),
-                                             WASM_BRV_IF_ZERO(0, WASM_F32(7.7)),
-                                             WASM_BRV_IF_ZERO(0, WASM_I8(11))));
+  EXPECT_FAILURE_INLINE(sigs.i_i(),
+                        WASM_BLOCK(3, WASM_BRV_IF_ZERO(0, WASM_I8(9)),
+                                   WASM_BRV_IF_ZERO(0, WASM_F32(7.7)),
+                                   WASM_BRV_IF_ZERO(0, WASM_I8(11))));
 }
 
-
-TEST_F(WasmDecoderTest, BreakNesting_6_levels) {
+TEST_F(AstDecoderTest, BreakNesting_6_levels) {
   for (int mask = 0; mask < 64; mask++) {
     for (int i = 0; i < 14; i++) {
       byte code[] = {
@@ -1629,39 +1418,37 @@
       }
 
       if (i < depth) {
-        EXPECT_VERIFIES(&env_v_v, code);
+        EXPECT_VERIFIES(sigs.v_v(), code);
       } else {
-        EXPECT_FAILURE(&env_v_v, code);
+        EXPECT_FAILURE(sigs.v_v(), code);
       }
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, ExprBreak_TypeCheck) {
-  FunctionEnv* envs[] = {&env_i_i, &env_l_l, &env_f_ff, &env_d_dd};
-  for (size_t i = 0; i < arraysize(envs); i++) {
-    FunctionEnv* env = envs[i];
+TEST_F(AstDecoderTest, ExprBreak_TypeCheck) {
+  FunctionSig* sigarray[] = {sigs.i_i(), sigs.l_l(), sigs.f_ff(), sigs.d_dd()};
+  for (size_t i = 0; i < arraysize(sigarray); i++) {
+    FunctionSig* sig = sigarray[i];
     // unify X and X => OK
     EXPECT_VERIFIES_INLINE(
-        env, WASM_BLOCK(2, WASM_IF(WASM_ZERO, WASM_BRV(0, WASM_GET_LOCAL(0))),
+        sig, WASM_BLOCK(2, WASM_IF(WASM_ZERO, WASM_BRV(0, WASM_GET_LOCAL(0))),
                         WASM_GET_LOCAL(0)));
   }
 
   // unify i32 and f32 => fail
   EXPECT_FAILURE_INLINE(
-      &env_i_i,
+      sigs.i_i(),
       WASM_BLOCK(2, WASM_IF(WASM_ZERO, WASM_BRV(0, WASM_ZERO)), WASM_F32(1.2)));
 
   // unify f64 and f64 => OK
   EXPECT_VERIFIES_INLINE(
-      &env_d_dd,
+      sigs.d_dd(),
       WASM_BLOCK(2, WASM_IF(WASM_ZERO, WASM_BRV(0, WASM_GET_LOCAL(0))),
                  WASM_F64(1.2)));
 }
 
-
-TEST_F(WasmDecoderTest, ExprBreak_TypeCheckAll) {
+TEST_F(AstDecoderTest, ExprBreak_TypeCheckAll) {
   byte code1[] = {WASM_BLOCK(2,
                              WASM_IF(WASM_ZERO, WASM_BRV(0, WASM_GET_LOCAL(0))),
                              WASM_GET_LOCAL(1))};
@@ -1671,32 +1458,26 @@
 
   for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
     for (size_t j = 0; j < arraysize(kLocalTypes); j++) {
-      FunctionEnv env;
       LocalType storage[] = {kLocalTypes[i], kLocalTypes[i], kLocalTypes[j]};
       FunctionSig sig(1, 2, storage);
-      init_env(&env, &sig);
 
       if (i == j) {
-        EXPECT_VERIFIES(&env, code1);
-        EXPECT_VERIFIES(&env, code2);
+        EXPECT_VERIFIES(&sig, code1);
+        EXPECT_VERIFIES(&sig, code2);
       } else {
-        EXPECT_FAILURE(&env, code1);
-        EXPECT_FAILURE(&env, code2);
+        EXPECT_FAILURE(&sig, code1);
+        EXPECT_FAILURE(&sig, code2);
       }
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, ExprBr_Unify) {
-  FunctionEnv env;
-
+TEST_F(AstDecoderTest, ExprBr_Unify) {
   for (int which = 0; which < 2; which++) {
     for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
       LocalType type = kLocalTypes[i];
       LocalType storage[] = {kAstI32, kAstI32, type};
       FunctionSig sig(1, 2, storage);
-      init_env(&env, &sig);  // (i32, X) -> i32
 
       byte code1[] = {
           WASM_BLOCK(2, WASM_IF(WASM_ZERO, WASM_BRV(0, WASM_GET_LOCAL(which))),
@@ -1707,37 +1488,34 @@
 
 
       if (type == kAstI32) {
-        EXPECT_VERIFIES(&env, code1);
-        EXPECT_VERIFIES(&env, code2);
+        EXPECT_VERIFIES(&sig, code1);
+        EXPECT_VERIFIES(&sig, code2);
       } else {
-        EXPECT_FAILURE(&env, code1);
-        EXPECT_FAILURE(&env, code2);
+        EXPECT_FAILURE(&sig, code1);
+        EXPECT_FAILURE(&sig, code2);
       }
     }
   }
 }
 
-TEST_F(WasmDecoderTest, ExprBrIf_cond_type) {
-  FunctionEnv env;
+TEST_F(AstDecoderTest, ExprBrIf_cond_type) {
   byte code[] = {
       WASM_BLOCK(1, WASM_BRV_IF(0, WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)))};
   for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
     for (size_t j = 0; j < arraysize(kLocalTypes); j++) {
       LocalType types[] = {kLocalTypes[i], kLocalTypes[j]};
       FunctionSig sig(0, 2, types);
-      init_env(&env, &sig);
 
       if (types[1] == kAstI32) {
-        EXPECT_VERIFIES(&env, code);
+        EXPECT_VERIFIES(&sig, code);
       } else {
-        EXPECT_FAILURE(&env, code);
+        EXPECT_FAILURE(&sig, code);
       }
     }
   }
 }
 
-TEST_F(WasmDecoderTest, ExprBrIf_val_type) {
-  FunctionEnv env;
+TEST_F(AstDecoderTest, ExprBrIf_val_type) {
   byte code[] = {
       WASM_BLOCK(2, WASM_BRV_IF(0, WASM_GET_LOCAL(1), WASM_GET_LOCAL(2)),
                  WASM_GET_LOCAL(0))};
@@ -1746,27 +1524,22 @@
       LocalType types[] = {kLocalTypes[i], kLocalTypes[i], kLocalTypes[j],
                            kAstI32};
       FunctionSig sig(1, 3, types);
-      init_env(&env, &sig);
 
       if (i == j) {
-        EXPECT_VERIFIES(&env, code);
+        EXPECT_VERIFIES(&sig, code);
       } else {
-        EXPECT_FAILURE(&env, code);
+        EXPECT_FAILURE(&sig, code);
       }
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, ExprBrIf_Unify) {
-  FunctionEnv env;
-
+TEST_F(AstDecoderTest, ExprBrIf_Unify) {
   for (int which = 0; which < 2; which++) {
     for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
       LocalType type = kLocalTypes[i];
       LocalType storage[] = {kAstI32, kAstI32, type};
       FunctionSig sig(1, 2, storage);
-      init_env(&env, &sig);  // (i32, X) -> i32
 
       byte code1[] = {WASM_BLOCK(2, WASM_BRV_IF_ZERO(0, WASM_GET_LOCAL(which)),
                                  WASM_GET_LOCAL(which ^ 1))};
@@ -1774,221 +1547,171 @@
                                 WASM_GET_LOCAL(which ^ 1))};
 
       if (type == kAstI32) {
-        EXPECT_VERIFIES(&env, code1);
-        EXPECT_VERIFIES(&env, code2);
+        EXPECT_VERIFIES(&sig, code1);
+        EXPECT_VERIFIES(&sig, code2);
       } else {
-        EXPECT_FAILURE(&env, code1);
-        EXPECT_FAILURE(&env, code2);
+        EXPECT_FAILURE(&sig, code1);
+        EXPECT_FAILURE(&sig, code2);
       }
     }
   }
 }
 
-
-TEST_F(WasmDecoderTest, TableSwitch0) {
-  static byte code[] = {kExprTableSwitch, 0, 0, 0, 0};
-  EXPECT_FAILURE(&env_v_v, code);
+TEST_F(AstDecoderTest, BrTable0) {
+  static byte code[] = {kExprBrTable, 0, 0};
+  EXPECT_FAILURE(sigs.v_v(), code);
 }
 
-
-TEST_F(WasmDecoderTest, TableSwitch0b) {
-  static byte code[] = {kExprTableSwitch, 0, 0, 0, 0, kExprI8Const, 11};
-  EXPECT_FAILURE(&env_v_v, code);
-  EXPECT_FAILURE(&env_i_i, code);
+TEST_F(AstDecoderTest, BrTable0b) {
+  static byte code[] = {kExprBrTable, 0, 0, kExprI32Const, 11};
+  EXPECT_FAILURE(sigs.v_v(), code);
+  EXPECT_FAILURE(sigs.i_i(), code);
 }
 
+TEST_F(AstDecoderTest, BrTable0c) {
+  static byte code[] = {kExprBrTable, 0, 1, 0, 0, kExprI32Const, 11};
+  EXPECT_FAILURE(sigs.v_v(), code);
+  EXPECT_FAILURE(sigs.i_i(), code);
+}
 
-TEST_F(WasmDecoderTest, TableSwitch0c) {
+TEST_F(AstDecoderTest, BrTable1a) {
   static byte code[] = {
-      WASM_BLOCK(1, WASM_TABLESWITCH_OP(0, 1, WASM_CASE_BR(0)), WASM_I8(67))};
-  EXPECT_VERIFIES(&env_v_v, code);
+      WASM_BLOCK(1, WASM_BR_TABLE(WASM_I8(67), 0, BR_TARGET(0)))};
+  EXPECT_VERIFIES(sigs.v_v(), code);
 }
 
-TEST_F(WasmDecoderTest, TableSwitch0d) {
+TEST_F(AstDecoderTest, BrTable1b) {
   static byte code[] = {
-      WASM_BLOCK(1, WASM_TABLESWITCH_OP(0, 2, WASM_CASE_BR(0), WASM_CASE_BR(1)),
-                 WASM_I8(67))};
-  EXPECT_VERIFIES(&env_v_v, code);
+      WASM_BLOCK(1, WASM_BR_TABLE(WASM_ZERO, 0, BR_TARGET(0)))};
+  EXPECT_VERIFIES(sigs.v_v(), code);
+  EXPECT_FAILURE(sigs.i_i(), code);
+  EXPECT_FAILURE(sigs.f_ff(), code);
+  EXPECT_FAILURE(sigs.d_dd(), code);
 }
 
-TEST_F(WasmDecoderTest, TableSwitch1) {
-  static byte code[] = {WASM_TABLESWITCH_OP(1, 1, WASM_CASE(0)),
-                        WASM_TABLESWITCH_BODY(WASM_I8(0), WASM_I8(9))};
-  EXPECT_VERIFIES(&env_i_i, code);
-  EXPECT_VERIFIES(&env_v_v, code);
-  EXPECT_FAILURE(&env_f_ff, code);
-  EXPECT_FAILURE(&env_d_dd, code);
+TEST_F(AstDecoderTest, BrTable2a) {
+  static byte code[] = {
+      WASM_BLOCK(1, WASM_BR_TABLE(WASM_I8(67), 1, BR_TARGET(0), BR_TARGET(0)))};
+  EXPECT_VERIFIES(sigs.v_v(), code);
 }
 
+TEST_F(AstDecoderTest, BrTable2b) {
+  static byte code[] = {WASM_BLOCK(
+      1, WASM_BLOCK(
+             1, WASM_BR_TABLE(WASM_I8(67), 1, BR_TARGET(0), BR_TARGET(1))))};
+  EXPECT_VERIFIES(sigs.v_v(), code);
+}
 
-TEST_F(WasmDecoderTest, TableSwitch_off_end) {
-  static byte code[] = {WASM_TABLESWITCH_OP(1, 1, WASM_CASE(0)),
-                        WASM_TABLESWITCH_BODY(WASM_I8(0), WASM_I8(9))};
-  for (size_t len = arraysize(code) - 1; len > 0; len--) {
-    Verify(kError, &env_v_v, code, code + len);
+TEST_F(AstDecoderTest, BrTable_off_end) {
+  static byte code[] = {
+      WASM_BLOCK(1, WASM_BR_TABLE(WASM_GET_LOCAL(0), 0, BR_TARGET(0)))};
+  for (size_t len = 1; len < sizeof(code); len++) {
+    Verify(kError, sigs.i_i(), code, code + len);
   }
 }
 
-
-TEST_F(WasmDecoderTest, TableSwitch2) {
-  static byte code[] = {
-      WASM_TABLESWITCH_OP(2, 2, WASM_CASE(0), WASM_CASE(1)),
-      WASM_TABLESWITCH_BODY(WASM_I8(3), WASM_I8(10), WASM_I8(11))};
-  EXPECT_VERIFIES(&env_i_i, code);
-  EXPECT_VERIFIES(&env_v_v, code);
-  EXPECT_FAILURE(&env_f_ff, code);
-  EXPECT_FAILURE(&env_d_dd, code);
-}
-
-
-TEST_F(WasmDecoderTest, TableSwitch1b) {
-  EXPECT_VERIFIES_INLINE(&env_i_i, WASM_TABLESWITCH_OP(1, 1, WASM_CASE(0)),
-                         WASM_TABLESWITCH_BODY(WASM_GET_LOCAL(0), WASM_ZERO));
-
-  EXPECT_VERIFIES_INLINE(&env_f_ff, WASM_TABLESWITCH_OP(1, 1, WASM_CASE(0)),
-                         WASM_TABLESWITCH_BODY(WASM_ZERO, WASM_F32(0.0)));
-
-  EXPECT_VERIFIES_INLINE(&env_d_dd, WASM_TABLESWITCH_OP(1, 1, WASM_CASE(0)),
-                         WASM_TABLESWITCH_BODY(WASM_ZERO, WASM_F64(0.0)));
-}
-
-TEST_F(WasmDecoderTest, TableSwitch_br1) {
-  for (int depth = 0; depth < 2; depth++) {
-    byte code[] = {WASM_BLOCK(1, WASM_TABLESWITCH_OP(0, 1, WASM_CASE_BR(depth)),
-                              WASM_GET_LOCAL(0))};
-    EXPECT_VERIFIES(&env_v_i, code);
-    EXPECT_FAILURE(&env_i_i, code);
+TEST_F(AstDecoderTest, BrTable_invalid_br1) {
+  for (int depth = 0; depth < 4; depth++) {
+    byte code[] = {
+        WASM_BLOCK(1, WASM_BR_TABLE(WASM_GET_LOCAL(0), 0, BR_TARGET(depth)))};
+    if (depth == 0) {
+      EXPECT_VERIFIES(sigs.v_i(), code);
+    } else {
+      EXPECT_FAILURE(sigs.v_i(), code);
+    }
   }
 }
 
-
-TEST_F(WasmDecoderTest, TableSwitch_invalid_br) {
-  for (int depth = 1; depth < 4; depth++) {
-    EXPECT_FAILURE_INLINE(&env_v_i,
-                          WASM_TABLESWITCH_OP(0, 1, WASM_CASE_BR(depth)),
-                          WASM_GET_LOCAL(0));
-    EXPECT_FAILURE_INLINE(
-        &env_v_i,
-        WASM_TABLESWITCH_OP(0, 2, WASM_CASE_BR(depth), WASM_CASE_BR(depth)),
-        WASM_GET_LOCAL(0));
+TEST_F(AstDecoderTest, BrTable_invalid_br2) {
+  for (int depth = 0; depth < 4; depth++) {
+    byte code[] = {
+        WASM_LOOP(1, WASM_BR_TABLE(WASM_GET_LOCAL(0), 0, BR_TARGET(depth)))};
+    if (depth <= 1) {
+      EXPECT_VERIFIES(sigs.v_i(), code);
+    } else {
+      EXPECT_FAILURE(sigs.v_i(), code);
+    }
   }
 }
 
-
-TEST_F(WasmDecoderTest, TableSwitch_invalid_case_ref) {
-  EXPECT_FAILURE_INLINE(&env_i_i, WASM_TABLESWITCH_OP(0, 1, WASM_CASE(0)),
-                        WASM_GET_LOCAL(0));
-  EXPECT_FAILURE_INLINE(&env_i_i, WASM_TABLESWITCH_OP(1, 1, WASM_CASE(1)),
-                        WASM_TABLESWITCH_BODY(WASM_GET_LOCAL(0), WASM_ZERO));
-}
-
-
-TEST_F(WasmDecoderTest, TableSwitch1_br) {
-  EXPECT_VERIFIES_INLINE(
-      &env_i_i, WASM_TABLESWITCH_OP(1, 1, WASM_CASE(0)),
-      WASM_TABLESWITCH_BODY(WASM_GET_LOCAL(0), WASM_BRV(0, WASM_ZERO)));
-}
-
-
-TEST_F(WasmDecoderTest, TableSwitch2_br) {
-  EXPECT_VERIFIES_INLINE(
-      &env_i_i, WASM_TABLESWITCH_OP(2, 2, WASM_CASE(0), WASM_CASE(1)),
-      WASM_TABLESWITCH_BODY(WASM_GET_LOCAL(0), WASM_BRV(0, WASM_I8(0)),
-                            WASM_BRV(0, WASM_I8(1))));
-
-  EXPECT_FAILURE_INLINE(
-      &env_f_ff, WASM_TABLESWITCH_OP(2, 2, WASM_CASE(0), WASM_CASE(1)),
-      WASM_TABLESWITCH_BODY(WASM_ZERO, WASM_BRV(0, WASM_I8(3)),
-                            WASM_BRV(0, WASM_I8(4))));
-}
-
-
-TEST_F(WasmDecoderTest, TableSwitch2x2) {
-  EXPECT_VERIFIES_INLINE(
-      &env_i_i, WASM_TABLESWITCH_OP(2, 4, WASM_CASE(0), WASM_CASE(1),
-                                    WASM_CASE(0), WASM_CASE(1)),
-      WASM_TABLESWITCH_BODY(WASM_GET_LOCAL(0), WASM_BRV(0, WASM_I8(3)),
-                            WASM_BRV(0, WASM_I8(4))));
-}
-
-
-TEST_F(WasmDecoderTest, ExprBreakNesting1) {
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_BLOCK(1, WASM_BRV(0, WASM_ZERO)));
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_BLOCK(1, WASM_BR(0)));
-  EXPECT_VERIFIES_INLINE(&env_v_v,
+TEST_F(AstDecoderTest, ExprBreakNesting1) {
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_BLOCK(1, WASM_BRV(0, WASM_ZERO)));
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_BLOCK(1, WASM_BR(0)));
+  EXPECT_VERIFIES_INLINE(sigs.v_v(),
                          WASM_BLOCK(1, WASM_BRV_IF(0, WASM_ZERO, WASM_ZERO)));
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_BLOCK(1, WASM_BR_IF(0, WASM_ZERO)));
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_BLOCK(1, WASM_BR_IF(0, WASM_ZERO)));
 
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_BRV(0, WASM_ZERO)));
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_BR(0)));
-  EXPECT_VERIFIES_INLINE(&env_v_v,
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_LOOP(1, WASM_BRV(0, WASM_ZERO)));
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_LOOP(1, WASM_BR(0)));
+  EXPECT_VERIFIES_INLINE(sigs.v_v(),
                          WASM_LOOP(1, WASM_BRV_IF(0, WASM_ZERO, WASM_ZERO)));
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_BR_IF(0, WASM_ZERO)));
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_LOOP(1, WASM_BR_IF(0, WASM_ZERO)));
 
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_BRV(1, WASM_ZERO)));
-  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_BR(1)));
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_LOOP(1, WASM_BRV(1, WASM_ZERO)));
+  EXPECT_VERIFIES_INLINE(sigs.v_v(), WASM_LOOP(1, WASM_BR(1)));
 }
 
-
-TEST_F(WasmDecoderTest, Select) {
+TEST_F(AstDecoderTest, Select) {
   EXPECT_VERIFIES_INLINE(
-      &env_i_i, WASM_SELECT(WASM_GET_LOCAL(0), WASM_GET_LOCAL(0), WASM_ZERO));
-  EXPECT_VERIFIES_INLINE(&env_f_ff,
+      sigs.i_i(), WASM_SELECT(WASM_GET_LOCAL(0), WASM_GET_LOCAL(0), WASM_ZERO));
+  EXPECT_VERIFIES_INLINE(sigs.f_ff(),
                          WASM_SELECT(WASM_F32(0.0), WASM_F32(0.0), WASM_ZERO));
-  EXPECT_VERIFIES_INLINE(&env_d_dd,
+  EXPECT_VERIFIES_INLINE(sigs.d_dd(),
                          WASM_SELECT(WASM_F64(0.0), WASM_F64(0.0), WASM_ZERO));
-  EXPECT_VERIFIES_INLINE(&env_l_l,
-                         WASM_SELECT(WASM_I64(0), WASM_I64(0), WASM_ZERO));
+  EXPECT_VERIFIES_INLINE(
+      sigs.l_l(), WASM_SELECT(WASM_I64V_1(0), WASM_I64V_1(0), WASM_ZERO));
 }
 
-TEST_F(WasmDecoderTest, Select_fail1) {
-  EXPECT_FAILURE_INLINE(&env_i_i, WASM_SELECT(WASM_F32(0.0), WASM_GET_LOCAL(0),
-                                              WASM_GET_LOCAL(0)));
-  EXPECT_FAILURE_INLINE(&env_i_i, WASM_SELECT(WASM_GET_LOCAL(0), WASM_F32(0.0),
-                                              WASM_GET_LOCAL(0)));
+TEST_F(AstDecoderTest, Select_fail1) {
   EXPECT_FAILURE_INLINE(
-      &env_i_i,
+      sigs.i_i(),
+      WASM_SELECT(WASM_F32(0.0), WASM_GET_LOCAL(0), WASM_GET_LOCAL(0)));
+  EXPECT_FAILURE_INLINE(
+      sigs.i_i(),
+      WASM_SELECT(WASM_GET_LOCAL(0), WASM_F32(0.0), WASM_GET_LOCAL(0)));
+  EXPECT_FAILURE_INLINE(
+      sigs.i_i(),
       WASM_SELECT(WASM_GET_LOCAL(0), WASM_GET_LOCAL(0), WASM_F32(0.0)));
 }
 
-TEST_F(WasmDecoderTest, Select_fail2) {
+TEST_F(AstDecoderTest, Select_fail2) {
   for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
     LocalType type = kLocalTypes[i];
     if (type == kAstI32) continue;
 
     LocalType types[] = {type, kAstI32, type};
     FunctionSig sig(1, 2, types);
-    FunctionEnv env;
-    init_env(&env, &sig);
 
     EXPECT_VERIFIES_INLINE(
-        &env,
+        &sig,
         WASM_SELECT(WASM_GET_LOCAL(1), WASM_GET_LOCAL(1), WASM_GET_LOCAL(0)));
 
     EXPECT_FAILURE_INLINE(
-        &env,
+        &sig,
         WASM_SELECT(WASM_GET_LOCAL(1), WASM_GET_LOCAL(0), WASM_GET_LOCAL(0)));
 
     EXPECT_FAILURE_INLINE(
-        &env,
+        &sig,
         WASM_SELECT(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1), WASM_GET_LOCAL(0)));
 
     EXPECT_FAILURE_INLINE(
-        &env,
+        &sig,
         WASM_SELECT(WASM_GET_LOCAL(0), WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
   }
 }
 
-
-TEST_F(WasmDecoderTest, Select_TypeCheck) {
-  EXPECT_FAILURE_INLINE(&env_i_i, WASM_SELECT(WASM_F32(9.9), WASM_GET_LOCAL(0),
-                                              WASM_GET_LOCAL(0)));
-
-  EXPECT_FAILURE_INLINE(&env_i_i, WASM_SELECT(WASM_GET_LOCAL(0), WASM_F64(0.25),
-                                              WASM_GET_LOCAL(0)));
+TEST_F(AstDecoderTest, Select_TypeCheck) {
+  EXPECT_FAILURE_INLINE(
+      sigs.i_i(),
+      WASM_SELECT(WASM_F32(9.9), WASM_GET_LOCAL(0), WASM_GET_LOCAL(0)));
 
   EXPECT_FAILURE_INLINE(
-      &env_i_i, WASM_SELECT(WASM_F32(9.9), WASM_GET_LOCAL(0), WASM_I64(0)));
+      sigs.i_i(),
+      WASM_SELECT(WASM_GET_LOCAL(0), WASM_F64(0.25), WASM_GET_LOCAL(0)));
+
+  EXPECT_FAILURE_INLINE(
+      sigs.i_i(),
+      WASM_SELECT(WASM_F32(9.9), WASM_GET_LOCAL(0), WASM_I64V_1(0)));
 }
 
 
@@ -2003,6 +1726,12 @@
     EXPECT_EQ(expected, OpcodeLength(code, code + sizeof(code))); \
   }
 
+#define EXPECT_LENGTH_N(expected, ...)                            \
+  {                                                               \
+    static const byte code[] = {__VA_ARGS__};                     \
+    EXPECT_EQ(expected, OpcodeLength(code, code + sizeof(code))); \
+  }
+
 TEST_F(WasmOpcodeLengthTest, Statements) {
   EXPECT_LENGTH(1, kExprNop);
   EXPECT_LENGTH(2, kExprBlock);
@@ -2017,9 +1746,7 @@
 
 TEST_F(WasmOpcodeLengthTest, MiscExpressions) {
   EXPECT_LENGTH(2, kExprI8Const);
-  EXPECT_LENGTH(5, kExprI32Const);
   EXPECT_LENGTH(5, kExprF32Const);
-  EXPECT_LENGTH(9, kExprI64Const);
   EXPECT_LENGTH(9, kExprF64Const);
   EXPECT_LENGTH(2, kExprGetLocal);
   EXPECT_LENGTH(2, kExprSetLocal);
@@ -2036,47 +1763,59 @@
   EXPECT_LENGTH(2, kExprBrIf);
 }
 
-
-TEST_F(WasmOpcodeLengthTest, VariableLength) {
-  byte size2[] = {kExprLoadGlobal, 1};
-  byte size3[] = {kExprLoadGlobal, 1 | 0x80, 2};
-  byte size4[] = {kExprLoadGlobal, 1 | 0x80, 2 | 0x80, 3};
-  byte size5[] = {kExprLoadGlobal, 1 | 0x80, 2 | 0x80, 3 | 0x80, 4};
-  byte size6[] = {kExprLoadGlobal, 1 | 0x80, 2 | 0x80, 3 | 0x80, 4 | 0x80, 5};
-
-  EXPECT_EQ(2, OpcodeLength(size2, size2 + sizeof(size2)));
-  EXPECT_EQ(3, OpcodeLength(size3, size3 + sizeof(size3)));
-  EXPECT_EQ(4, OpcodeLength(size4, size4 + sizeof(size4)));
-  EXPECT_EQ(5, OpcodeLength(size5, size5 + sizeof(size5)));
-  EXPECT_EQ(6, OpcodeLength(size6, size6 + sizeof(size6)));
+TEST_F(WasmOpcodeLengthTest, I32Const) {
+  EXPECT_LENGTH_N(2, kExprI32Const, U32V_1(1));
+  EXPECT_LENGTH_N(3, kExprI32Const, U32V_2(999));
+  EXPECT_LENGTH_N(4, kExprI32Const, U32V_3(9999));
+  EXPECT_LENGTH_N(5, kExprI32Const, U32V_4(999999));
+  EXPECT_LENGTH_N(6, kExprI32Const, U32V_5(99999999));
 }
 
+TEST_F(WasmOpcodeLengthTest, I64Const) {
+  EXPECT_LENGTH_N(2, kExprI64Const, U32V_1(1));
+  EXPECT_LENGTH_N(3, kExprI64Const, U32V_2(99));
+  EXPECT_LENGTH_N(4, kExprI64Const, U32V_3(9999));
+  EXPECT_LENGTH_N(5, kExprI64Const, U32V_4(99999));
+  EXPECT_LENGTH_N(6, kExprI64Const, U32V_5(9999999));
+  EXPECT_LENGTH_N(7, WASM_I64V_6(777777));
+  EXPECT_LENGTH_N(8, WASM_I64V_7(7777777));
+  EXPECT_LENGTH_N(9, WASM_I64V_8(77777777));
+  EXPECT_LENGTH_N(10, WASM_I64V_9(777777777));
+}
+
+TEST_F(WasmOpcodeLengthTest, VariableLength) {
+  EXPECT_LENGTH_N(2, kExprLoadGlobal, U32V_1(1));
+  EXPECT_LENGTH_N(3, kExprLoadGlobal, U32V_2(33));
+  EXPECT_LENGTH_N(4, kExprLoadGlobal, U32V_3(44));
+  EXPECT_LENGTH_N(5, kExprLoadGlobal, U32V_4(66));
+  EXPECT_LENGTH_N(6, kExprLoadGlobal, U32V_5(77));
+}
 
 TEST_F(WasmOpcodeLengthTest, LoadsAndStores) {
-  EXPECT_LENGTH(2, kExprI32LoadMem8S);
-  EXPECT_LENGTH(2, kExprI32LoadMem8U);
-  EXPECT_LENGTH(2, kExprI32LoadMem16S);
-  EXPECT_LENGTH(2, kExprI32LoadMem16U);
-  EXPECT_LENGTH(2, kExprI32LoadMem);
-  EXPECT_LENGTH(2, kExprI64LoadMem8S);
-  EXPECT_LENGTH(2, kExprI64LoadMem8U);
-  EXPECT_LENGTH(2, kExprI64LoadMem16S);
-  EXPECT_LENGTH(2, kExprI64LoadMem16U);
-  EXPECT_LENGTH(2, kExprI64LoadMem32S);
-  EXPECT_LENGTH(2, kExprI64LoadMem32U);
-  EXPECT_LENGTH(2, kExprI64LoadMem);
-  EXPECT_LENGTH(2, kExprF32LoadMem);
-  EXPECT_LENGTH(2, kExprF64LoadMem);
+  EXPECT_LENGTH(3, kExprI32LoadMem8S);
+  EXPECT_LENGTH(3, kExprI32LoadMem8U);
+  EXPECT_LENGTH(3, kExprI32LoadMem16S);
+  EXPECT_LENGTH(3, kExprI32LoadMem16U);
+  EXPECT_LENGTH(3, kExprI32LoadMem);
+  EXPECT_LENGTH(3, kExprI64LoadMem8S);
+  EXPECT_LENGTH(3, kExprI64LoadMem8U);
+  EXPECT_LENGTH(3, kExprI64LoadMem16S);
+  EXPECT_LENGTH(3, kExprI64LoadMem16U);
+  EXPECT_LENGTH(3, kExprI64LoadMem32S);
+  EXPECT_LENGTH(3, kExprI64LoadMem32U);
+  EXPECT_LENGTH(3, kExprI64LoadMem);
+  EXPECT_LENGTH(3, kExprF32LoadMem);
+  EXPECT_LENGTH(3, kExprF64LoadMem);
 
-  EXPECT_LENGTH(2, kExprI32StoreMem8);
-  EXPECT_LENGTH(2, kExprI32StoreMem16);
-  EXPECT_LENGTH(2, kExprI32StoreMem);
-  EXPECT_LENGTH(2, kExprI64StoreMem8);
-  EXPECT_LENGTH(2, kExprI64StoreMem16);
-  EXPECT_LENGTH(2, kExprI64StoreMem32);
-  EXPECT_LENGTH(2, kExprI64StoreMem);
-  EXPECT_LENGTH(2, kExprF32StoreMem);
-  EXPECT_LENGTH(2, kExprF64StoreMem);
+  EXPECT_LENGTH(3, kExprI32StoreMem8);
+  EXPECT_LENGTH(3, kExprI32StoreMem16);
+  EXPECT_LENGTH(3, kExprI32StoreMem);
+  EXPECT_LENGTH(3, kExprI64StoreMem8);
+  EXPECT_LENGTH(3, kExprI64StoreMem16);
+  EXPECT_LENGTH(3, kExprI64StoreMem32);
+  EXPECT_LENGTH(3, kExprI64StoreMem);
+  EXPECT_LENGTH(3, kExprF32StoreMem);
+  EXPECT_LENGTH(3, kExprF64StoreMem);
 }
 
 
@@ -2113,7 +1852,7 @@
   EXPECT_LENGTH(1, kExprI32Clz);
   EXPECT_LENGTH(1, kExprI32Ctz);
   EXPECT_LENGTH(1, kExprI32Popcnt);
-  EXPECT_LENGTH(1, kExprBoolNot);
+  EXPECT_LENGTH(1, kExprI32Eqz);
   EXPECT_LENGTH(1, kExprI64Add);
   EXPECT_LENGTH(1, kExprI64Sub);
   EXPECT_LENGTH(1, kExprI64Mul);
@@ -2211,16 +1950,18 @@
 class WasmOpcodeArityTest : public TestWithZone {
  public:
   WasmOpcodeArityTest() : TestWithZone() {}
+  TestModuleEnv module;
+  TestSignatures sigs;
 };
 
-#define EXPECT_ARITY(expected, ...)                                    \
-  {                                                                    \
-    static const byte code[] = {__VA_ARGS__};                          \
-    EXPECT_EQ(expected, OpcodeArity(&env, code, code + sizeof(code))); \
+#define EXPECT_ARITY(expected, ...)                                            \
+  {                                                                            \
+    static const byte code[] = {__VA_ARGS__};                                  \
+    EXPECT_EQ(expected, OpcodeArity(&module, sig, code, code + sizeof(code))); \
   }
 
 TEST_F(WasmOpcodeArityTest, Control) {
-  FunctionEnv env;
+  FunctionSig* sig = sigs.v_v();
   EXPECT_ARITY(0, kExprNop);
 
   EXPECT_ARITY(0, kExprBlock, 0);
@@ -2243,19 +1984,16 @@
   EXPECT_ARITY(2, kExprBrIf);
 
   {
-    TestSignatures sigs;
-    FunctionEnv env;
-    WasmDecoderTest::init_env(&env, sigs.v_v());
+    sig = sigs.v_v();
     EXPECT_ARITY(0, kExprReturn);
-    WasmDecoderTest::init_env(&env, sigs.i_i());
+    sig = sigs.i_i();
     EXPECT_ARITY(1, kExprReturn);
   }
 }
 
 
 TEST_F(WasmOpcodeArityTest, Misc) {
-  FunctionEnv env;
-
+  FunctionSig* sig = sigs.v_v();
   EXPECT_ARITY(0, kExprI8Const);
   EXPECT_ARITY(0, kExprI32Const);
   EXPECT_ARITY(0, kExprF32Const);
@@ -2269,8 +2007,6 @@
 
 
 TEST_F(WasmOpcodeArityTest, Calls) {
-  TestSignatures sigs;
-  TestModuleEnv module;
   module.AddFunction(sigs.i_ii());
   module.AddFunction(sigs.i_i());
 
@@ -2281,9 +2017,7 @@
   module.AddImport(sigs.i_d());
 
   {
-    FunctionEnv env;
-    WasmDecoderTest::init_env(&env, sigs.i_ii());
-    env.module = &module;
+    FunctionSig* sig = sigs.i_ii();
 
     EXPECT_ARITY(2, kExprCallFunction, 0);
     EXPECT_ARITY(2, kExprCallImport, 0);
@@ -2293,9 +2027,7 @@
   }
 
   {
-    FunctionEnv env;
-    WasmDecoderTest::init_env(&env, sigs.v_v());
-    env.module = &module;
+    FunctionSig* sig = sigs.v_v();
 
     EXPECT_ARITY(1, kExprCallFunction, 1);
     EXPECT_ARITY(1, kExprCallImport, 1);
@@ -2307,8 +2039,7 @@
 
 
 TEST_F(WasmOpcodeArityTest, LoadsAndStores) {
-  FunctionEnv env;
-
+  FunctionSig* sig = sigs.v_v();
   EXPECT_ARITY(1, kExprI32LoadMem8S);
   EXPECT_ARITY(1, kExprI32LoadMem8U);
   EXPECT_ARITY(1, kExprI32LoadMem16S);
@@ -2338,16 +2069,14 @@
 
 
 TEST_F(WasmOpcodeArityTest, MiscMemExpressions) {
-  FunctionEnv env;
-
+  FunctionSig* sig = sigs.v_v();
   EXPECT_ARITY(0, kExprMemorySize);
   EXPECT_ARITY(1, kExprGrowMemory);
 }
 
 
 TEST_F(WasmOpcodeArityTest, SimpleExpressions) {
-  FunctionEnv env;
-
+  FunctionSig* sig = sigs.v_v();
   EXPECT_ARITY(2, kExprI32Add);
   EXPECT_ARITY(2, kExprI32Sub);
   EXPECT_ARITY(2, kExprI32Mul);
@@ -2374,7 +2103,7 @@
   EXPECT_ARITY(1, kExprI32Clz);
   EXPECT_ARITY(1, kExprI32Ctz);
   EXPECT_ARITY(1, kExprI32Popcnt);
-  EXPECT_ARITY(1, kExprBoolNot);
+  EXPECT_ARITY(1, kExprI32Eqz);
   EXPECT_ARITY(2, kExprI64Add);
   EXPECT_ARITY(2, kExprI64Sub);
   EXPECT_ARITY(2, kExprI64Mul);
@@ -2467,6 +2196,127 @@
   EXPECT_ARITY(1, kExprI32ReinterpretF32);
   EXPECT_ARITY(1, kExprI64ReinterpretF64);
 }
+
+typedef ZoneVector<LocalType> LocalTypeMap;
+
+class LocalDeclDecoderTest : public TestWithZone {
+ public:
+  base::AccountingAllocator allocator;
+
+  size_t ExpectRun(LocalTypeMap map, size_t pos, LocalType expected,
+                   size_t count) {
+    for (size_t i = 0; i < count; i++) {
+      EXPECT_EQ(expected, map[pos++]);
+    }
+    return pos;
+  }
+
+  LocalTypeMap Expand(AstLocalDecls& decls) {
+    ZoneVector<LocalType> map(zone());
+    for (auto p : decls.local_types) {
+      map.insert(map.end(), p.second, p.first);
+    }
+    return map;
+  }
+};
+
+TEST_F(LocalDeclDecoderTest, EmptyLocals) {
+  AstLocalDecls decls(zone());
+  bool result = DecodeLocalDecls(decls, nullptr, nullptr);
+  EXPECT_FALSE(result);
+}
+
+TEST_F(LocalDeclDecoderTest, NoLocals) {
+  static const byte data[] = {0};
+  AstLocalDecls decls(zone());
+  bool result = DecodeLocalDecls(decls, data, data + sizeof(data));
+  EXPECT_TRUE(result);
+  EXPECT_EQ(0, decls.total_local_count);
+}
+
+TEST_F(LocalDeclDecoderTest, OneLocal) {
+  for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
+    LocalType type = kLocalTypes[i];
+    const byte data[] = {
+        1, 1, static_cast<byte>(WasmOpcodes::LocalTypeCodeFor(type))};
+    AstLocalDecls decls(zone());
+    bool result = DecodeLocalDecls(decls, data, data + sizeof(data));
+    EXPECT_TRUE(result);
+    EXPECT_EQ(1, decls.total_local_count);
+
+    LocalTypeMap map = Expand(decls);
+    EXPECT_EQ(1, map.size());
+    EXPECT_EQ(type, map.at(0));
+  }
+}
+
+TEST_F(LocalDeclDecoderTest, FiveLocals) {
+  for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
+    LocalType type = kLocalTypes[i];
+    const byte data[] = {
+        1, 5, static_cast<byte>(WasmOpcodes::LocalTypeCodeFor(type))};
+    AstLocalDecls decls(zone());
+    bool result = DecodeLocalDecls(decls, data, data + sizeof(data));
+    EXPECT_TRUE(result);
+    EXPECT_EQ(sizeof(data), decls.decls_encoded_size);
+    EXPECT_EQ(5, decls.total_local_count);
+
+    LocalTypeMap map = Expand(decls);
+    EXPECT_EQ(5, map.size());
+    ExpectRun(map, 0, type, 5);
+  }
+}
+
+TEST_F(LocalDeclDecoderTest, MixedLocals) {
+  for (byte a = 0; a < 3; a++) {
+    for (byte b = 0; b < 3; b++) {
+      for (byte c = 0; c < 3; c++) {
+        for (byte d = 0; d < 3; d++) {
+          const byte data[] = {4, a,         kLocalI32, b,        kLocalI64,
+                               c, kLocalF32, d,         kLocalF64};
+          AstLocalDecls decls(zone());
+          bool result = DecodeLocalDecls(decls, data, data + sizeof(data));
+          EXPECT_TRUE(result);
+          EXPECT_EQ(sizeof(data), decls.decls_encoded_size);
+          EXPECT_EQ(a + b + c + d, decls.total_local_count);
+
+          LocalTypeMap map = Expand(decls);
+          EXPECT_EQ(a + b + c + d, map.size());
+
+          size_t pos = 0;
+          pos = ExpectRun(map, pos, kAstI32, a);
+          pos = ExpectRun(map, pos, kAstI64, b);
+          pos = ExpectRun(map, pos, kAstF32, c);
+          pos = ExpectRun(map, pos, kAstF64, d);
+        }
+      }
+    }
+  }
+}
+
+TEST_F(LocalDeclDecoderTest, UseEncoder) {
+  const byte* data = nullptr;
+  const byte* end = nullptr;
+  LocalDeclEncoder local_decls;
+
+  local_decls.AddLocals(5, kAstF32);
+  local_decls.AddLocals(1337, kAstI32);
+  local_decls.AddLocals(212, kAstI64);
+  local_decls.Prepend(&data, &end);
+
+  AstLocalDecls decls(zone());
+  bool result = DecodeLocalDecls(decls, data, end);
+  EXPECT_TRUE(result);
+  EXPECT_EQ(5 + 1337 + 212, decls.total_local_count);
+
+  LocalTypeMap map = Expand(decls);
+  size_t pos = 0;
+  pos = ExpectRun(map, pos, kAstF32, 5);
+  pos = ExpectRun(map, pos, kAstI32, 1337);
+  pos = ExpectRun(map, pos, kAstI64, 212);
+  delete[] data;
+}
+
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
diff --git a/test/unittests/wasm/decoder-unittest.cc b/test/unittests/wasm/decoder-unittest.cc
new file mode 100644
index 0000000..11d68f1
--- /dev/null
+++ b/test/unittests/wasm/decoder-unittest.cc
@@ -0,0 +1,667 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "test/unittests/test-utils.h"
+
+#include "src/wasm/decoder.h"
+#include "src/wasm/wasm-macro-gen.h"
+
+namespace v8 {
+namespace internal {
+namespace wasm {
+
+class DecoderTest : public TestWithZone {
+ public:
+  DecoderTest() : decoder(nullptr, nullptr) {}
+
+  Decoder decoder;
+};
+
+#define CHECK_UINT32V_INLINE(expected, expected_length, ...)           \
+  do {                                                                 \
+    const byte data[] = {__VA_ARGS__};                                 \
+    decoder.Reset(data, data + sizeof(data));                          \
+    int length;                                                        \
+    EXPECT_EQ(expected,                                                \
+              decoder.checked_read_u32v(decoder.start(), 0, &length)); \
+    EXPECT_EQ(expected_length, length);                                \
+  } while (false)
+
+#define CHECK_INT32V_INLINE(expected, expected_length, ...)            \
+  do {                                                                 \
+    const byte data[] = {__VA_ARGS__};                                 \
+    decoder.Reset(data, data + sizeof(data));                          \
+    int length;                                                        \
+    EXPECT_EQ(expected,                                                \
+              decoder.checked_read_i32v(decoder.start(), 0, &length)); \
+    EXPECT_EQ(expected_length, length);                                \
+  } while (false)
+
+#define CHECK_UINT64V_INLINE(expected, expected_length, ...)           \
+  do {                                                                 \
+    const byte data[] = {__VA_ARGS__};                                 \
+    decoder.Reset(data, data + sizeof(data));                          \
+    int length;                                                        \
+    EXPECT_EQ(expected,                                                \
+              decoder.checked_read_u64v(decoder.start(), 0, &length)); \
+    EXPECT_EQ(expected_length, length);                                \
+  } while (false)
+
+#define CHECK_INT64V_INLINE(expected, expected_length, ...)            \
+  do {                                                                 \
+    const byte data[] = {__VA_ARGS__};                                 \
+    decoder.Reset(data, data + sizeof(data));                          \
+    int length;                                                        \
+    EXPECT_EQ(expected,                                                \
+              decoder.checked_read_i64v(decoder.start(), 0, &length)); \
+    EXPECT_EQ(expected_length, length);                                \
+  } while (false)
+
+TEST_F(DecoderTest, ReadU32v_OneByte) {
+  CHECK_UINT32V_INLINE(0, 1, 0);
+  CHECK_UINT32V_INLINE(5, 1, 5);
+  CHECK_UINT32V_INLINE(7, 1, 7);
+  CHECK_UINT32V_INLINE(9, 1, 9);
+  CHECK_UINT32V_INLINE(37, 1, 37);
+  CHECK_UINT32V_INLINE(69, 1, 69);
+  CHECK_UINT32V_INLINE(110, 1, 110);
+  CHECK_UINT32V_INLINE(125, 1, 125);
+  CHECK_UINT32V_INLINE(126, 1, 126);
+  CHECK_UINT32V_INLINE(127, 1, 127);
+}
+
+TEST_F(DecoderTest, ReadU32v_TwoByte) {
+  CHECK_UINT32V_INLINE(0, 1, 0, 0);
+  CHECK_UINT32V_INLINE(10, 1, 10, 0);
+  CHECK_UINT32V_INLINE(27, 1, 27, 0);
+  CHECK_UINT32V_INLINE(100, 1, 100, 0);
+
+  CHECK_UINT32V_INLINE(444, 2, U32V_2(444));
+  CHECK_UINT32V_INLINE(544, 2, U32V_2(544));
+  CHECK_UINT32V_INLINE(1311, 2, U32V_2(1311));
+  CHECK_UINT32V_INLINE(2333, 2, U32V_2(2333));
+
+  for (uint32_t i = 0; i < 1 << 14; i = i * 13 + 1) {
+    CHECK_UINT32V_INLINE(i, 2, U32V_2(i));
+  }
+
+  const uint32_t max = (1 << 14) - 1;
+  CHECK_UINT32V_INLINE(max, 2, U32V_2(max));
+}
+
+TEST_F(DecoderTest, ReadU32v_ThreeByte) {
+  CHECK_UINT32V_INLINE(0, 1, 0, 0, 0, 0);
+  CHECK_UINT32V_INLINE(10, 1, 10, 0, 0, 0);
+  CHECK_UINT32V_INLINE(27, 1, 27, 0, 0, 0);
+  CHECK_UINT32V_INLINE(100, 1, 100, 0, 0, 0);
+
+  CHECK_UINT32V_INLINE(11, 3, U32V_3(11));
+  CHECK_UINT32V_INLINE(101, 3, U32V_3(101));
+  CHECK_UINT32V_INLINE(446, 3, U32V_3(446));
+  CHECK_UINT32V_INLINE(546, 3, U32V_3(546));
+  CHECK_UINT32V_INLINE(1319, 3, U32V_3(1319));
+  CHECK_UINT32V_INLINE(2338, 3, U32V_3(2338));
+  CHECK_UINT32V_INLINE(8191, 3, U32V_3(8191));
+  CHECK_UINT32V_INLINE(9999, 3, U32V_3(9999));
+  CHECK_UINT32V_INLINE(14444, 3, U32V_3(14444));
+  CHECK_UINT32V_INLINE(314444, 3, U32V_3(314444));
+  CHECK_UINT32V_INLINE(614444, 3, U32V_3(614444));
+
+  const uint32_t max = (1 << 21) - 1;
+
+  for (uint32_t i = 0; i <= max; i = i * 13 + 3) {
+    CHECK_UINT32V_INLINE(i, 3, U32V_3(i), 0);
+  }
+
+  CHECK_UINT32V_INLINE(max, 3, U32V_3(max));
+}
+
+TEST_F(DecoderTest, ReadU32v_FourByte) {
+  CHECK_UINT32V_INLINE(0, 1, 0, 0, 0, 0, 0);
+  CHECK_UINT32V_INLINE(10, 1, 10, 0, 0, 0, 0);
+  CHECK_UINT32V_INLINE(27, 1, 27, 0, 0, 0, 0);
+  CHECK_UINT32V_INLINE(100, 1, 100, 0, 0, 0, 0);
+
+  CHECK_UINT32V_INLINE(13, 4, U32V_4(13));
+  CHECK_UINT32V_INLINE(107, 4, U32V_4(107));
+  CHECK_UINT32V_INLINE(449, 4, U32V_4(449));
+  CHECK_UINT32V_INLINE(541, 4, U32V_4(541));
+  CHECK_UINT32V_INLINE(1317, 4, U32V_4(1317));
+  CHECK_UINT32V_INLINE(2334, 4, U32V_4(2334));
+  CHECK_UINT32V_INLINE(8191, 4, U32V_4(8191));
+  CHECK_UINT32V_INLINE(9994, 4, U32V_4(9994));
+  CHECK_UINT32V_INLINE(14442, 4, U32V_4(14442));
+  CHECK_UINT32V_INLINE(314442, 4, U32V_4(314442));
+  CHECK_UINT32V_INLINE(614442, 4, U32V_4(614442));
+  CHECK_UINT32V_INLINE(1614442, 4, U32V_4(1614442));
+  CHECK_UINT32V_INLINE(5614442, 4, U32V_4(5614442));
+  CHECK_UINT32V_INLINE(19614442, 4, U32V_4(19614442));
+
+  const uint32_t max = (1 << 28) - 1;
+
+  for (uint32_t i = 0; i <= max; i = i * 13 + 5) {
+    CHECK_UINT32V_INLINE(i, 4, U32V_4(i), 0);
+  }
+
+  CHECK_UINT32V_INLINE(max, 4, U32V_4(max));
+}
+
+TEST_F(DecoderTest, ReadU32v_FiveByte) {
+  CHECK_UINT32V_INLINE(0, 1, 0, 0, 0, 0, 0);
+  CHECK_UINT32V_INLINE(10, 1, 10, 0, 0, 0, 0);
+  CHECK_UINT32V_INLINE(27, 1, 27, 0, 0, 0, 0);
+  CHECK_UINT32V_INLINE(100, 1, 100, 0, 0, 0, 0);
+
+  CHECK_UINT32V_INLINE(13, 5, U32V_5(13));
+  CHECK_UINT32V_INLINE(107, 5, U32V_5(107));
+  CHECK_UINT32V_INLINE(449, 5, U32V_5(449));
+  CHECK_UINT32V_INLINE(541, 5, U32V_5(541));
+  CHECK_UINT32V_INLINE(1317, 5, U32V_5(1317));
+  CHECK_UINT32V_INLINE(2334, 5, U32V_5(2334));
+  CHECK_UINT32V_INLINE(8191, 5, U32V_5(8191));
+  CHECK_UINT32V_INLINE(9994, 5, U32V_5(9994));
+  CHECK_UINT32V_INLINE(24442, 5, U32V_5(24442));
+  CHECK_UINT32V_INLINE(414442, 5, U32V_5(414442));
+  CHECK_UINT32V_INLINE(714442, 5, U32V_5(714442));
+  CHECK_UINT32V_INLINE(1614442, 5, U32V_5(1614442));
+  CHECK_UINT32V_INLINE(6614442, 5, U32V_5(6614442));
+  CHECK_UINT32V_INLINE(89614442, 5, U32V_5(89614442));
+  CHECK_UINT32V_INLINE(2219614442u, 5, U32V_5(2219614442u));
+  CHECK_UINT32V_INLINE(3219614442u, 5, U32V_5(3219614442u));
+  CHECK_UINT32V_INLINE(4019614442u, 5, U32V_5(4019614442u));
+
+  const uint32_t max = 0xFFFFFFFFu;
+
+  for (uint32_t i = 1; i < 32; i++) {
+    uint32_t val = 0x983489aau << i;
+    CHECK_UINT32V_INLINE(val, 5, U32V_5(val), 0);
+  }
+
+  CHECK_UINT32V_INLINE(max, 5, U32V_5(max));
+}
+
+TEST_F(DecoderTest, ReadU32v_various) {
+  for (int i = 0; i < 10; i++) {
+    uint32_t x = 0xCCCCCCCCu * i;
+    for (int width = 0; width < 32; width++) {
+      uint32_t val = x >> width;
+
+      CHECK_UINT32V_INLINE(val & MASK_7, 1, U32V_1(val));
+      CHECK_UINT32V_INLINE(val & MASK_14, 2, U32V_2(val));
+      CHECK_UINT32V_INLINE(val & MASK_21, 3, U32V_3(val));
+      CHECK_UINT32V_INLINE(val & MASK_28, 4, U32V_4(val));
+      CHECK_UINT32V_INLINE(val, 5, U32V_5(val));
+    }
+  }
+}
+
+TEST_F(DecoderTest, ReadI32v_OneByte) {
+  CHECK_INT32V_INLINE(0, 1, 0);
+  CHECK_INT32V_INLINE(4, 1, 4);
+  CHECK_INT32V_INLINE(6, 1, 6);
+  CHECK_INT32V_INLINE(9, 1, 9);
+  CHECK_INT32V_INLINE(33, 1, 33);
+  CHECK_INT32V_INLINE(61, 1, 61);
+  CHECK_INT32V_INLINE(63, 1, 63);
+
+  CHECK_INT32V_INLINE(-1, 1, 127);
+  CHECK_INT32V_INLINE(-2, 1, 126);
+  CHECK_INT32V_INLINE(-11, 1, 117);
+  CHECK_INT32V_INLINE(-62, 1, 66);
+  CHECK_INT32V_INLINE(-63, 1, 65);
+  CHECK_INT32V_INLINE(-64, 1, 64);
+}
+
+TEST_F(DecoderTest, ReadI32v_TwoByte) {
+  CHECK_INT32V_INLINE(0, 2, U32V_2(0));
+  CHECK_INT32V_INLINE(9, 2, U32V_2(9));
+  CHECK_INT32V_INLINE(61, 2, U32V_2(61));
+  CHECK_INT32V_INLINE(63, 2, U32V_2(63));
+
+  CHECK_INT32V_INLINE(-1, 2, U32V_2(-1));
+  CHECK_INT32V_INLINE(-2, 2, U32V_2(-2));
+  CHECK_INT32V_INLINE(-63, 2, U32V_2(-63));
+  CHECK_INT32V_INLINE(-64, 2, U32V_2(-64));
+
+  CHECK_INT32V_INLINE(-200, 2, U32V_2(-200));
+  CHECK_INT32V_INLINE(-1002, 2, U32V_2(-1002));
+  CHECK_INT32V_INLINE(-2004, 2, U32V_2(-2004));
+  CHECK_INT32V_INLINE(-4077, 2, U32V_2(-4077));
+
+  CHECK_INT32V_INLINE(207, 2, U32V_2(207));
+  CHECK_INT32V_INLINE(1009, 2, U32V_2(1009));
+  CHECK_INT32V_INLINE(2003, 2, U32V_2(2003));
+  CHECK_INT32V_INLINE(4072, 2, U32V_2(4072));
+
+  const int32_t min = 0 - (1 << 13);
+  for (int i = min; i < min + 10; i++) {
+    CHECK_INT32V_INLINE(i, 2, U32V_2(i));
+  }
+
+  const int32_t max = (1 << 13) - 1;
+  for (int i = max; i > max - 10; i--) {
+    CHECK_INT32V_INLINE(i, 2, U32V_2(i));
+  }
+}
+
+TEST_F(DecoderTest, ReadI32v_ThreeByte) {
+  CHECK_INT32V_INLINE(0, 3, U32V_3(0));
+  CHECK_INT32V_INLINE(9, 3, U32V_3(9));
+  CHECK_INT32V_INLINE(61, 3, U32V_3(61));
+  CHECK_INT32V_INLINE(63, 3, U32V_3(63));
+
+  CHECK_INT32V_INLINE(-1, 3, U32V_3(-1));
+  CHECK_INT32V_INLINE(-2, 3, U32V_3(-2));
+  CHECK_INT32V_INLINE(-63, 3, U32V_3(-63));
+  CHECK_INT32V_INLINE(-64, 3, U32V_3(-64));
+
+  CHECK_INT32V_INLINE(-207, 3, U32V_3(-207));
+  CHECK_INT32V_INLINE(-1012, 3, U32V_3(-1012));
+  CHECK_INT32V_INLINE(-4067, 3, U32V_3(-4067));
+  CHECK_INT32V_INLINE(-14067, 3, U32V_3(-14067));
+  CHECK_INT32V_INLINE(-234061, 3, U32V_3(-234061));
+
+  CHECK_INT32V_INLINE(237, 3, U32V_3(237));
+  CHECK_INT32V_INLINE(1309, 3, U32V_3(1309));
+  CHECK_INT32V_INLINE(4372, 3, U32V_3(4372));
+  CHECK_INT32V_INLINE(64372, 3, U32V_3(64372));
+  CHECK_INT32V_INLINE(374372, 3, U32V_3(374372));
+
+  const int32_t min = 0 - (1 << 20);
+  for (int i = min; i < min + 10; i++) {
+    CHECK_INT32V_INLINE(i, 3, U32V_3(i));
+  }
+
+  const int32_t max = (1 << 20) - 1;
+  for (int i = max; i > max - 10; i--) {
+    CHECK_INT32V_INLINE(i, 3, U32V_3(i));
+  }
+}
+
+TEST_F(DecoderTest, ReadI32v_FourByte) {
+  CHECK_INT32V_INLINE(0, 4, U32V_4(0));
+  CHECK_INT32V_INLINE(9, 4, U32V_4(9));
+  CHECK_INT32V_INLINE(61, 4, U32V_4(61));
+  CHECK_INT32V_INLINE(63, 4, U32V_4(63));
+
+  CHECK_INT32V_INLINE(-1, 4, U32V_4(-1));
+  CHECK_INT32V_INLINE(-2, 4, U32V_4(-2));
+  CHECK_INT32V_INLINE(-63, 4, U32V_4(-63));
+  CHECK_INT32V_INLINE(-64, 4, U32V_4(-64));
+
+  CHECK_INT32V_INLINE(-267, 4, U32V_4(-267));
+  CHECK_INT32V_INLINE(-1612, 4, U32V_4(-1612));
+  CHECK_INT32V_INLINE(-4667, 4, U32V_4(-4667));
+  CHECK_INT32V_INLINE(-16067, 4, U32V_4(-16067));
+  CHECK_INT32V_INLINE(-264061, 4, U32V_4(-264061));
+  CHECK_INT32V_INLINE(-1264061, 4, U32V_4(-1264061));
+  CHECK_INT32V_INLINE(-6264061, 4, U32V_4(-6264061));
+  CHECK_INT32V_INLINE(-8264061, 4, U32V_4(-8264061));
+
+  CHECK_INT32V_INLINE(277, 4, U32V_4(277));
+  CHECK_INT32V_INLINE(1709, 4, U32V_4(1709));
+  CHECK_INT32V_INLINE(4772, 4, U32V_4(4772));
+  CHECK_INT32V_INLINE(67372, 4, U32V_4(67372));
+  CHECK_INT32V_INLINE(374372, 4, U32V_4(374372));
+  CHECK_INT32V_INLINE(2374372, 4, U32V_4(2374372));
+  CHECK_INT32V_INLINE(7374372, 4, U32V_4(7374372));
+  CHECK_INT32V_INLINE(9374372, 4, U32V_4(9374372));
+
+  const int32_t min = 0 - (1 << 27);
+  for (int i = min; i < min + 10; i++) {
+    CHECK_INT32V_INLINE(i, 4, U32V_4(i));
+  }
+
+  const int32_t max = (1 << 27) - 1;
+  for (int i = max; i > max - 10; i--) {
+    CHECK_INT32V_INLINE(i, 4, U32V_4(i));
+  }
+}
+
+TEST_F(DecoderTest, ReadI32v_FiveByte) {
+  CHECK_INT32V_INLINE(0, 5, U32V_5(0));
+  CHECK_INT32V_INLINE(16, 5, U32V_5(16));
+  CHECK_INT32V_INLINE(94, 5, U32V_5(94));
+  CHECK_INT32V_INLINE(127, 5, U32V_5(127));
+
+  CHECK_INT32V_INLINE(-1, 5, U32V_5(-1));
+  CHECK_INT32V_INLINE(-2, 5, U32V_5(-2));
+  CHECK_INT32V_INLINE(-63, 5, U32V_5(-63));
+  CHECK_INT32V_INLINE(-64, 5, U32V_5(-64));
+
+  CHECK_INT32V_INLINE(-257, 5, U32V_5(-257));
+  CHECK_INT32V_INLINE(-1512, 5, U32V_5(-1512));
+  CHECK_INT32V_INLINE(-4567, 5, U32V_5(-4567));
+  CHECK_INT32V_INLINE(-15067, 5, U32V_5(-15067));
+  CHECK_INT32V_INLINE(-254061, 5, U32V_5(-254061));
+  CHECK_INT32V_INLINE(-1364061, 5, U32V_5(-1364061));
+  CHECK_INT32V_INLINE(-6364061, 5, U32V_5(-6364061));
+  CHECK_INT32V_INLINE(-8364061, 5, U32V_5(-8364061));
+  CHECK_INT32V_INLINE(-28364061, 5, U32V_5(-28364061));
+  CHECK_INT32V_INLINE(-228364061, 5, U32V_5(-228364061));
+
+  CHECK_INT32V_INLINE(227, 5, U32V_5(227));
+  CHECK_INT32V_INLINE(1209, 5, U32V_5(1209));
+  CHECK_INT32V_INLINE(4272, 5, U32V_5(4272));
+  CHECK_INT32V_INLINE(62372, 5, U32V_5(62372));
+  CHECK_INT32V_INLINE(324372, 5, U32V_5(324372));
+  CHECK_INT32V_INLINE(2274372, 5, U32V_5(2274372));
+  CHECK_INT32V_INLINE(7274372, 5, U32V_5(7274372));
+  CHECK_INT32V_INLINE(9274372, 5, U32V_5(9274372));
+  CHECK_INT32V_INLINE(42374372, 5, U32V_5(42374372));
+  CHECK_INT32V_INLINE(429374372, 5, U32V_5(429374372));
+
+  const int32_t min = kMinInt;
+  for (int i = min; i < min + 10; i++) {
+    CHECK_INT32V_INLINE(i, 5, U32V_5(i));
+  }
+
+  const int32_t max = kMaxInt;
+  for (int i = max; i > max - 10; i--) {
+    CHECK_INT32V_INLINE(i, 5, U32V_5(i));
+  }
+}
+
+TEST_F(DecoderTest, ReadU32v_off_end1) {
+  static const byte data[] = {U32V_1(11)};
+  int length = 0;
+  decoder.Reset(data, data);
+  decoder.checked_read_u32v(decoder.start(), 0, &length);
+  EXPECT_EQ(0, length);
+  EXPECT_FALSE(decoder.ok());
+}
+
+TEST_F(DecoderTest, ReadU32v_off_end2) {
+  static const byte data[] = {U32V_2(1111)};
+  for (size_t i = 0; i < sizeof(data); i++) {
+    int length = 0;
+    decoder.Reset(data, data + i);
+    decoder.checked_read_u32v(decoder.start(), 0, &length);
+    EXPECT_EQ(i, length);
+    EXPECT_FALSE(decoder.ok());
+  }
+}
+
+TEST_F(DecoderTest, ReadU32v_off_end3) {
+  static const byte data[] = {U32V_3(111111)};
+  for (size_t i = 0; i < sizeof(data); i++) {
+    int length = 0;
+    decoder.Reset(data, data + i);
+    decoder.checked_read_u32v(decoder.start(), 0, &length);
+    EXPECT_EQ(i, length);
+    EXPECT_FALSE(decoder.ok());
+  }
+}
+
+TEST_F(DecoderTest, ReadU32v_off_end4) {
+  static const byte data[] = {U32V_4(11111111)};
+  for (size_t i = 0; i < sizeof(data); i++) {
+    int length = 0;
+    decoder.Reset(data, data + i);
+    decoder.checked_read_u32v(decoder.start(), 0, &length);
+    EXPECT_EQ(i, length);
+    EXPECT_FALSE(decoder.ok());
+  }
+}
+
+TEST_F(DecoderTest, ReadU32v_off_end5) {
+  static const byte data[] = {U32V_5(111111111)};
+  for (size_t i = 0; i < sizeof(data); i++) {
+    int length = 0;
+    decoder.Reset(data, data + i);
+    decoder.checked_read_u32v(decoder.start(), 0, &length);
+    EXPECT_EQ(i, length);
+    EXPECT_FALSE(decoder.ok());
+  }
+}
+
+TEST_F(DecoderTest, ReadU32v_extra_bits) {
+  byte data[] = {0x80, 0x80, 0x80, 0x80, 0x00};
+  for (int i = 1; i < 16; i++) {
+    data[4] = static_cast<byte>(i << 4);
+    int length = 0;
+    decoder.Reset(data, data + sizeof(data));
+    decoder.checked_read_u32v(decoder.start(), 0, &length);
+    EXPECT_EQ(5, length);
+    EXPECT_FALSE(decoder.ok());
+  }
+}
+
+TEST_F(DecoderTest, ReadI32v_extra_bits_negative) {
+  // OK for negative signed values to have extra ones.
+  int length = 0;
+  byte data[] = {0xff, 0xff, 0xff, 0xff, 0x7f};
+  decoder.Reset(data, data + sizeof(data));
+  decoder.checked_read_i32v(decoder.start(), 0, &length);
+  EXPECT_EQ(5, length);
+  EXPECT_TRUE(decoder.ok());
+}
+
+TEST_F(DecoderTest, ReadI32v_extra_bits_positive) {
+  // Not OK for positive signed values to have extra ones.
+  int length = 0;
+  byte data[] = {0x80, 0x80, 0x80, 0x80, 0x77};
+  decoder.Reset(data, data + sizeof(data));
+  decoder.checked_read_i32v(decoder.start(), 0, &length);
+  EXPECT_EQ(5, length);
+  EXPECT_FALSE(decoder.ok());
+}
+
+TEST_F(DecoderTest, ReadU32v_Bits) {
+  // A more exhaustive test.
+  const int kMaxSize = 5;
+  const uint32_t kVals[] = {
+      0xaabbccdd, 0x11223344, 0x33445566, 0xffeeddcc, 0xF0F0F0F0, 0x0F0F0F0F,
+      0xEEEEEEEE, 0xAAAAAAAA, 0x12345678, 0x9abcdef0, 0x80309488, 0x729ed997,
+      0xc4a0cf81, 0x16c6eb85, 0x4206db8e, 0xf3b089d5, 0xaa2e223e, 0xf99e29c8,
+      0x4a4357d8, 0x1890b1c1, 0x8d80a085, 0xacb6ae4c, 0x1b827e10, 0xeb5c7bd9,
+      0xbb1bc146, 0xdf57a33l};
+  byte data[kMaxSize];
+
+  // foreach value in above array
+  for (size_t v = 0; v < arraysize(kVals); v++) {
+    // foreach length 1...32
+    for (int i = 1; i <= 32; i++) {
+      uint32_t val = kVals[v];
+      if (i < 32) val &= ((1 << i) - 1);
+
+      int length = 1 + i / 7;
+      for (int j = 0; j < kMaxSize; j++) {
+        data[j] = static_cast<byte>((val >> (7 * j)) & MASK_7);
+      }
+      for (int j = 0; j < length - 1; j++) {
+        data[j] |= 0x80;
+      }
+
+      // foreach buffer size 0...5
+      for (int limit = 0; limit <= kMaxSize; limit++) {
+        decoder.Reset(data, data + limit);
+        int rlen;
+        uint32_t result = decoder.checked_read_u32v(data, 0, &rlen);
+        if (limit < length) {
+          EXPECT_FALSE(decoder.ok());
+        } else {
+          EXPECT_TRUE(decoder.ok());
+          EXPECT_EQ(val, result);
+          EXPECT_EQ(length, rlen);
+        }
+      }
+    }
+  }
+}
+
+TEST_F(DecoderTest, ReadU64v_OneByte) {
+  CHECK_UINT64V_INLINE(0, 1, 0);
+  CHECK_UINT64V_INLINE(6, 1, 6);
+  CHECK_UINT64V_INLINE(8, 1, 8);
+  CHECK_UINT64V_INLINE(12, 1, 12);
+  CHECK_UINT64V_INLINE(33, 1, 33);
+  CHECK_UINT64V_INLINE(59, 1, 59);
+  CHECK_UINT64V_INLINE(110, 1, 110);
+  CHECK_UINT64V_INLINE(125, 1, 125);
+  CHECK_UINT64V_INLINE(126, 1, 126);
+  CHECK_UINT64V_INLINE(127, 1, 127);
+}
+
+TEST_F(DecoderTest, ReadI64v_OneByte) {
+  CHECK_INT64V_INLINE(0, 1, 0);
+  CHECK_INT64V_INLINE(4, 1, 4);
+  CHECK_INT64V_INLINE(6, 1, 6);
+  CHECK_INT64V_INLINE(9, 1, 9);
+  CHECK_INT64V_INLINE(33, 1, 33);
+  CHECK_INT64V_INLINE(61, 1, 61);
+  CHECK_INT64V_INLINE(63, 1, 63);
+
+  CHECK_INT64V_INLINE(-1, 1, 127);
+  CHECK_INT64V_INLINE(-2, 1, 126);
+  CHECK_INT64V_INLINE(-11, 1, 117);
+  CHECK_INT64V_INLINE(-62, 1, 66);
+  CHECK_INT64V_INLINE(-63, 1, 65);
+  CHECK_INT64V_INLINE(-64, 1, 64);
+}
+
+TEST_F(DecoderTest, ReadU64v_PowerOf2) {
+  const int kMaxSize = 10;
+  byte data[kMaxSize];
+
+  for (int i = 0; i < 64; i++) {
+    const uint64_t val = 1ull << i;
+    int index = i / 7;
+    data[index] = 1 << (i % 7);
+    memset(data, 0x80, index);
+
+    for (int limit = 0; limit <= kMaxSize; limit++) {
+      decoder.Reset(data, data + limit);
+      int length;
+      uint64_t result = decoder.checked_read_u64v(data, 0, &length);
+      if (limit <= index) {
+        EXPECT_FALSE(decoder.ok());
+      } else {
+        EXPECT_TRUE(decoder.ok());
+        EXPECT_EQ(val, result);
+        EXPECT_EQ(index + 1, length);
+      }
+    }
+  }
+}
+
+TEST_F(DecoderTest, ReadU64v_Bits) {
+  const int kMaxSize = 10;
+  const uint64_t kVals[] = {
+      0xaabbccdd11223344ull, 0x33445566ffeeddccull, 0xF0F0F0F0F0F0F0F0ull,
+      0x0F0F0F0F0F0F0F0Full, 0xEEEEEEEEEEEEEEEEull, 0xAAAAAAAAAAAAAAAAull,
+      0x123456789abcdef0ull, 0x80309488729ed997ull, 0xc4a0cf8116c6eb85ull,
+      0x4206db8ef3b089d5ull, 0xaa2e223ef99e29c8ull, 0x4a4357d81890b1c1ull,
+      0x8d80a085acb6ae4cull, 0x1b827e10eb5c7bd9ull, 0xbb1bc146df57a338ull};
+  byte data[kMaxSize];
+
+  // foreach value in above array
+  for (size_t v = 0; v < arraysize(kVals); v++) {
+    // foreach length 1...64
+    for (int i = 1; i <= 64; i++) {
+      uint64_t val = kVals[v];
+      if (i < 64) val &= ((1ull << i) - 1);
+
+      int length = 1 + i / 7;
+      for (int j = 0; j < kMaxSize; j++) {
+        data[j] = static_cast<byte>((val >> (7 * j)) & MASK_7);
+      }
+      for (int j = 0; j < length - 1; j++) {
+        data[j] |= 0x80;
+      }
+
+      // foreach buffer size 0...10
+      for (int limit = 0; limit <= kMaxSize; limit++) {
+        decoder.Reset(data, data + limit);
+        int rlen;
+        uint64_t result = decoder.checked_read_u64v(data, 0, &rlen);
+        if (limit < length) {
+          EXPECT_FALSE(decoder.ok());
+        } else {
+          EXPECT_TRUE(decoder.ok());
+          EXPECT_EQ(val, result);
+          EXPECT_EQ(length, rlen);
+        }
+      }
+    }
+  }
+}
+
+TEST_F(DecoderTest, ReadI64v_Bits) {
+  const int kMaxSize = 10;
+  // Exhaustive signedness test.
+  const uint64_t kVals[] = {
+      0xaabbccdd11223344ull, 0x33445566ffeeddccull, 0xF0F0F0F0F0F0F0F0ull,
+      0x0F0F0F0F0F0F0F0Full, 0xEEEEEEEEEEEEEEEEull, 0xAAAAAAAAAAAAAAAAull,
+      0x123456789abcdef0ull, 0x80309488729ed997ull, 0xc4a0cf8116c6eb85ull,
+      0x4206db8ef3b089d5ull, 0xaa2e223ef99e29c8ull, 0x4a4357d81890b1c1ull,
+      0x8d80a085acb6ae4cull, 0x1b827e10eb5c7bd9ull, 0xbb1bc146df57a338ull};
+  byte data[kMaxSize];
+
+  // foreach value in above array
+  for (size_t v = 0; v < arraysize(kVals); v++) {
+    // foreach length 1...64
+    for (int i = 1; i <= 64; i++) {
+      const int64_t val = bit_cast<int64_t>(kVals[v] << (64 - i)) >> (64 - i);
+
+      int length = 1 + i / 7;
+      for (int j = 0; j < kMaxSize; j++) {
+        data[j] = static_cast<byte>((val >> (7 * j)) & MASK_7);
+      }
+      for (int j = 0; j < length - 1; j++) {
+        data[j] |= 0x80;
+      }
+
+      // foreach buffer size 0...10
+      for (int limit = 0; limit <= kMaxSize; limit++) {
+        decoder.Reset(data, data + limit);
+        int rlen;
+        int64_t result = decoder.checked_read_i64v(data, 0, &rlen);
+        if (limit < length) {
+          EXPECT_FALSE(decoder.ok());
+        } else {
+          EXPECT_TRUE(decoder.ok());
+          EXPECT_EQ(val, result);
+          EXPECT_EQ(length, rlen);
+        }
+      }
+    }
+  }
+}
+
+TEST_F(DecoderTest, ReadU64v_extra_bits) {
+  byte data[] = {0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x00};
+  for (int i = 1; i < 128; i++) {
+    data[9] = static_cast<byte>(i << 1);
+    int length = 0;
+    decoder.Reset(data, data + sizeof(data));
+    decoder.checked_read_u64v(decoder.start(), 0, &length);
+    EXPECT_EQ(10, length);
+    EXPECT_FALSE(decoder.ok());
+  }
+}
+
+TEST_F(DecoderTest, ReadI64v_extra_bits_negative) {
+  // OK for negative signed values to have extra ones.
+  int length = 0;
+  byte data[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f};
+  decoder.Reset(data, data + sizeof(data));
+  decoder.checked_read_i64v(decoder.start(), 0, &length);
+  EXPECT_EQ(10, length);
+  EXPECT_TRUE(decoder.ok());
+}
+
+TEST_F(DecoderTest, ReadI64v_extra_bits_positive) {
+  // Not OK for positive signed values to have extra ones.
+  int length = 0;
+  byte data[] = {0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x77};
+  decoder.Reset(data, data + sizeof(data));
+  decoder.checked_read_i64v(decoder.start(), 0, &length);
+  EXPECT_EQ(10, length);
+  EXPECT_FALSE(decoder.ok());
+}
+
+}  // namespace wasm
+}  // namespace internal
+}  // namespace v8
diff --git a/test/unittests/wasm/encoder-unittest.cc b/test/unittests/wasm/encoder-unittest.cc
index e09e71a..740c054 100644
--- a/test/unittests/wasm/encoder-unittest.cc
+++ b/test/unittests/wasm/encoder-unittest.cc
@@ -52,7 +52,8 @@
 
 
 TEST_F(EncoderTest, Function_Builder_Variable_Indexing) {
-  Zone zone;
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint16_t f_index = builder->AddFunction();
   WasmFunctionBuilder* function = builder->FunctionAt(f_index);
@@ -86,14 +87,12 @@
   byte* header = buffer;
   byte* body = buffer + f->HeaderSize();
   f->Serialize(buffer, &header, &body);
-  for (size_t i = 0; i < 7; i++) {
-    CHECK_EQ(i, static_cast<size_t>(*(buffer + 2 * i + f->HeaderSize() + 1)));
-  }
 }
 
 
 TEST_F(EncoderTest, Function_Builder_Indexing_Variable_Width) {
-  Zone zone;
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint16_t f_index = builder->AddFunction();
   WasmFunctionBuilder* function = builder->FunctionAt(f_index);
@@ -109,17 +108,85 @@
   byte* body = buffer + f->HeaderSize();
   f->Serialize(buffer, &header, &body);
   body = buffer + f->HeaderSize();
-  for (size_t i = 0; i < 127; i++) {
-    CHECK_EQ(kExprGetLocal, static_cast<size_t>(*(body + 2 * i)));
-    CHECK_EQ(i + 1, static_cast<size_t>(*(body + 2 * i + 1)));
-  }
-  CHECK_EQ(kExprGetLocal, static_cast<size_t>(*(body + 2 * 127)));
-  CHECK_EQ(0x80, static_cast<size_t>(*(body + 2 * 127 + 1)));
-  CHECK_EQ(0x01, static_cast<size_t>(*(body + 2 * 127 + 2)));
-  CHECK_EQ(kExprGetLocal, static_cast<size_t>(*(body + 2 * 127 + 3)));
-  CHECK_EQ(0x00, static_cast<size_t>(*(body + 2 * 127 + 4)));
 }
 
+TEST_F(EncoderTest, Function_Builder_Block_Variable_Width) {
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
+  WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
+  uint16_t f_index = builder->AddFunction();
+  WasmFunctionBuilder* function = builder->FunctionAt(f_index);
+  function->EmitWithVarInt(kExprBlock, 200);
+  for (int i = 0; i < 200; ++i) {
+    function->Emit(kExprNop);
+  }
+
+  WasmFunctionEncoder* f = function->Build(&zone, builder);
+  CHECK_EQ(f->BodySize(), 204);
+}
+
+TEST_F(EncoderTest, Function_Builder_EmitEditableVarIntImmediate) {
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
+  WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
+  uint16_t f_index = builder->AddFunction();
+  WasmFunctionBuilder* function = builder->FunctionAt(f_index);
+  function->Emit(kExprLoop);
+  uint32_t offset = function->EmitEditableVarIntImmediate();
+  for (int i = 0; i < 200; ++i) {
+    function->Emit(kExprNop);
+  }
+  function->EditVarIntImmediate(offset, 200);
+
+  WasmFunctionEncoder* f = function->Build(&zone, builder);
+  CHECK_EQ(f->BodySize(), 204);
+}
+
+TEST_F(EncoderTest, Function_Builder_EmitEditableVarIntImmediate_Locals) {
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
+  WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
+  uint16_t f_index = builder->AddFunction();
+  WasmFunctionBuilder* function = builder->FunctionAt(f_index);
+  function->Emit(kExprBlock);
+  uint32_t offset = function->EmitEditableVarIntImmediate();
+  for (int i = 0; i < 200; ++i) {
+    AddLocal(function, kAstI32);
+  }
+  function->EditVarIntImmediate(offset, 200);
+
+  WasmFunctionEncoder* f = function->Build(&zone, builder);
+  ZoneVector<uint8_t> buffer_vector(f->HeaderSize() + f->BodySize(), &zone);
+  byte* buffer = &buffer_vector[0];
+  byte* header = buffer;
+  byte* body = buffer + f->HeaderSize();
+  f->Serialize(buffer, &header, &body);
+  body = buffer + f->HeaderSize();
+
+  CHECK_EQ(f->BodySize(), 479);
+  const uint8_t varint200_low = (200 & 0x7f) | 0x80;
+  const uint8_t varint200_high = (200 >> 7) & 0x7f;
+  offset = 0;
+  CHECK_EQ(body[offset++], 1);  // Local decl count.
+  CHECK_EQ(body[offset++], varint200_low);
+  CHECK_EQ(body[offset++], varint200_high);
+  CHECK_EQ(body[offset++], kLocalI32);
+  CHECK_EQ(body[offset++], kExprBlock);
+  CHECK_EQ(body[offset++], varint200_low);
+  CHECK_EQ(body[offset++], varint200_high);
+  // GetLocal with one-byte indices.
+  for (int i = 0; i <= 127; ++i) {
+    CHECK_EQ(body[offset++], kExprGetLocal);
+    CHECK_EQ(body[offset++], i);
+  }
+  // GetLocal with two-byte indices.
+  for (int i = 128; i < 200; ++i) {
+    CHECK_EQ(body[offset++], kExprGetLocal);
+    CHECK_EQ(body[offset++], (i & 0x7f) | 0x80);
+    CHECK_EQ(body[offset++], (i >> 7) & 0x7f);
+  }
+  CHECK_EQ(offset, 479);
+}
 
 TEST_F(EncoderTest, LEB_Functions) {
   byte leb_value[5] = {0, 0, 0, 0, 0};
diff --git a/test/unittests/wasm/loop-assignment-analysis-unittest.cc b/test/unittests/wasm/loop-assignment-analysis-unittest.cc
index 9586219..e77c1cf 100644
--- a/test/unittests/wasm/loop-assignment-analysis-unittest.cc
+++ b/test/unittests/wasm/loop-assignment-analysis-unittest.cc
@@ -23,25 +23,12 @@
 
 class WasmLoopAssignmentAnalyzerTest : public TestWithZone {
  public:
-  WasmLoopAssignmentAnalyzerTest() : TestWithZone(), sigs() {
-    init_env(&env, sigs.v_v());
-  }
-
+  WasmLoopAssignmentAnalyzerTest() : num_locals(0) {}
   TestSignatures sigs;
-  FunctionEnv env;
-
-  static void init_env(FunctionEnv* env, FunctionSig* sig) {
-    env->module = nullptr;
-    env->sig = sig;
-    env->local_i32_count = 0;
-    env->local_i64_count = 0;
-    env->local_f32_count = 0;
-    env->local_f64_count = 0;
-    env->SumLocals();
-  }
+  uint32_t num_locals;
 
   BitVector* Analyze(const byte* start, const byte* end) {
-    return AnalyzeLoopAssignmentForTesting(zone(), &env, start, end);
+    return AnalyzeLoopAssignmentForTesting(zone(), num_locals, start, end);
   }
 };
 
@@ -60,13 +47,13 @@
     for (int j = 0; j < assigned->length(); j++) {
       CHECK_EQ(false, assigned->Contains(j));
     }
-    env.AddLocals(kAstI32, 1);
+    num_locals++;
   }
 }
 
 
 TEST_F(WasmLoopAssignmentAnalyzerTest, One) {
-  env.AddLocals(kAstI32, 5);
+  num_locals = 5;
   for (int i = 0; i < 5; i++) {
     byte code[] = {WASM_LOOP(1, WASM_SET_ZERO(i))};
     BitVector* assigned = Analyze(code, code + arraysize(code));
@@ -78,7 +65,7 @@
 
 
 TEST_F(WasmLoopAssignmentAnalyzerTest, OneBeyond) {
-  env.AddLocals(kAstI32, 5);
+  num_locals = 5;
   for (int i = 0; i < 5; i++) {
     byte code[] = {WASM_LOOP(1, WASM_SET_ZERO(i)), WASM_SET_ZERO(1)};
     BitVector* assigned = Analyze(code, code + arraysize(code));
@@ -90,7 +77,7 @@
 
 
 TEST_F(WasmLoopAssignmentAnalyzerTest, Two) {
-  env.AddLocals(kAstI32, 5);
+  num_locals = 5;
   for (int i = 0; i < 5; i++) {
     for (int j = 0; j < 5; j++) {
       byte code[] = {WASM_LOOP(2, WASM_SET_ZERO(i), WASM_SET_ZERO(j))};
@@ -105,7 +92,7 @@
 
 
 TEST_F(WasmLoopAssignmentAnalyzerTest, NestedIf) {
-  env.AddLocals(kAstI32, 5);
+  num_locals = 5;
   for (int i = 0; i < 5; i++) {
     byte code[] = {WASM_LOOP(
         1, WASM_IF_ELSE(WASM_SET_ZERO(0), WASM_SET_ZERO(i), WASM_SET_ZERO(1)))};
@@ -126,7 +113,7 @@
 
 
 TEST_F(WasmLoopAssignmentAnalyzerTest, BigLocal) {
-  env.AddLocals(kAstI32, 65000);
+  num_locals = 65000;
   for (int i = 13; i < 65000; i = static_cast<int>(i * 1.5)) {
     byte code[] = {kExprLoop,
                    1,
@@ -148,7 +135,7 @@
 
 
 TEST_F(WasmLoopAssignmentAnalyzerTest, Break) {
-  env.AddLocals(kAstI32, 3);
+  num_locals = 3;
   byte code[] = {
       WASM_LOOP(1, WASM_IF(WASM_GET_LOCAL(0), WASM_BRV(1, WASM_SET_ZERO(1)))),
       WASM_SET_ZERO(0)};
@@ -162,7 +149,7 @@
 
 
 TEST_F(WasmLoopAssignmentAnalyzerTest, Loop1) {
-  env.AddLocals(kAstI32, 5);
+  num_locals = 5;
   byte code[] = {
       WASM_LOOP(1, WASM_IF(WASM_GET_LOCAL(0),
                            WASM_BRV(0, WASM_SET_LOCAL(
@@ -179,9 +166,8 @@
 
 
 TEST_F(WasmLoopAssignmentAnalyzerTest, Loop2) {
-  env.AddLocals(kAstI32, 3);
+  num_locals = 6;
   const byte kIter = 0;
-  env.AddLocals(kAstF32, 3);
   const byte kSum = 3;
 
   byte code[] = {WASM_BLOCK(
diff --git a/test/unittests/wasm/module-decoder-unittest.cc b/test/unittests/wasm/module-decoder-unittest.cc
index 467ffcc..44e7865 100644
--- a/test/unittests/wasm/module-decoder-unittest.cc
+++ b/test/unittests/wasm/module-decoder-unittest.cc
@@ -5,20 +5,26 @@
 #include "test/unittests/test-utils.h"
 
 #include "src/wasm/module-decoder.h"
+#include "src/wasm/wasm-macro-gen.h"
 #include "src/wasm/wasm-opcodes.h"
 
 namespace v8 {
 namespace internal {
 namespace wasm {
 
-class WasmModuleVerifyTest : public TestWithZone {
- public:
-  ModuleResult DecodeModule(const byte* module_start, const byte* module_end) {
-    return DecodeWasmModule(nullptr, zone(), module_start, module_end, false,
-                            false);
-  }
-};
+#define EMPTY_FUNCTION(sig_index) 0, SIG_INDEX(sig_index), U16_LE(0)
+#define EMPTY_FUNCTION_SIZE ((size_t)5)
+#define EMPTY_BODY 0
+#define EMPTY_BODY_SIZE ((size_t)1)
+#define NOP_BODY 2, 0, kExprNop
+#define NOP_BODY_SIZE ((size_t)3)
+#define VOID_VOID_SIG 0, kLocalVoid
+#define VOID_VOID_SIG_SIZE ((size_t)2)
+#define INT_INT_SIG 1, kLocalI32, kLocalI32
+#define INT_INT_SIG_SIZE ((size_t)3)
 
+#define SECTION(NAME, EXTRA_SIZE) \
+  U32V_1(WASM_SECTION_##NAME##_SIZE + (EXTRA_SIZE)), WASM_SECTION_##NAME
 
 #define EXPECT_VERIFIES(data)                                         \
   do {                                                                \
@@ -27,14 +33,30 @@
     if (result.val) delete result.val;                                \
   } while (false)
 
-
-#define EXPECT_FAILURE(data)                                          \
-  do {                                                                \
-    ModuleResult result = DecodeModule(data, data + arraysize(data)); \
-    EXPECT_FALSE(result.ok());                                        \
-    if (result.val) delete result.val;                                \
+#define EXPECT_FAILURE_LEN(data, length)                     \
+  do {                                                       \
+    ModuleResult result = DecodeModule(data, data + length); \
+    EXPECT_FALSE(result.ok());                               \
+    if (result.val) delete result.val;                       \
   } while (false)
 
+#define EXPECT_FAILURE(data) EXPECT_FAILURE_LEN(data, sizeof(data))
+
+#define EXPECT_OFF_END_FAILURE(data, min, max)          \
+  do {                                                  \
+    for (size_t length = min; length < max; length++) { \
+      EXPECT_FAILURE_LEN(data, length);                 \
+    }                                                   \
+  } while (false)
+
+static size_t SizeOfVarInt(size_t value) {
+  size_t size = 0;
+  do {
+    size++;
+    value = value >> 7;
+  } while (value > 0);
+  return size;
+}
 
 struct LocalTypePair {
   uint8_t code;
@@ -44,39 +66,59 @@
                    {kLocalF32, kAstF32},
                    {kLocalF64, kAstF64}};
 
-
-// TODO(titzer): use these macros everywhere below.
-#define U32_LE(v)                                    \
-  static_cast<byte>(v), static_cast<byte>((v) >> 8), \
-      static_cast<byte>((v) >> 16), static_cast<byte>((v) >> 24)
-
-
-#define U16_LE(v) static_cast<byte>(v), static_cast<byte>((v) >> 8)
-
-
-TEST_F(WasmModuleVerifyTest, DecodeEmpty) {
-  static const byte data[1]{kDeclEnd};
-  {
-    ModuleResult result = DecodeModule(data, data);
-    EXPECT_TRUE(result.ok());
-    if (result.val) delete result.val;
+class WasmModuleVerifyTest : public TestWithZone {
+ public:
+  ModuleResult DecodeModule(const byte* module_start, const byte* module_end) {
+    // Add the WASM magic and version number automatically.
+    size_t size = static_cast<size_t>(module_end - module_start);
+    byte header[] = {WASM_MODULE_HEADER};
+    size_t total = sizeof(header) + size;
+    auto temp = new byte[total];
+    memcpy(temp, header, sizeof(header));
+    memcpy(temp + sizeof(header), module_start, size);
+    ModuleResult result = DecodeWasmModule(nullptr, zone(), temp, temp + total,
+                                           false, kWasmOrigin);
+    delete[] temp;
+    return result;
   }
-  {
-    ModuleResult result = DecodeModule(data, data + 1);
-    EXPECT_TRUE(result.ok());
+  ModuleResult DecodeModuleNoHeader(const byte* module_start,
+                                    const byte* module_end) {
+    return DecodeWasmModule(nullptr, zone(), module_start, module_end, false,
+                            kWasmOrigin);
+  }
+};
+
+TEST_F(WasmModuleVerifyTest, WrongMagic) {
+  for (uint32_t x = 1; x; x <<= 1) {
+    const byte data[] = {U32_LE(kWasmMagic ^ x), U32_LE(kWasmVersion),
+                         SECTION(END, 0)};
+    ModuleResult result = DecodeModuleNoHeader(data, data + sizeof(data));
+    EXPECT_FALSE(result.ok());
     if (result.val) delete result.val;
   }
 }
 
+TEST_F(WasmModuleVerifyTest, WrongVersion) {
+  for (uint32_t x = 1; x; x <<= 1) {
+    const byte data[] = {U32_LE(kWasmMagic), U32_LE(kWasmVersion ^ x),
+                         SECTION(END, 0)};
+    ModuleResult result = DecodeModuleNoHeader(data, data + sizeof(data));
+    EXPECT_FALSE(result.ok());
+    if (result.val) delete result.val;
+  }
+}
+
+TEST_F(WasmModuleVerifyTest, DecodeEmpty) {
+  static const byte data[] = {SECTION(END, 0)};
+  EXPECT_VERIFIES(data);
+}
 
 TEST_F(WasmModuleVerifyTest, OneGlobal) {
   static const byte data[] = {
-      kDeclGlobals,
+      SECTION(GLOBALS, 7),  // --
       1,
-      0,
-      0,
-      0,
-      0,        // name offset
+      NAME_LENGTH(1),
+      'g',      // name
       kMemI32,  // memory type
       0,        // exported
   };
@@ -85,13 +127,13 @@
     // Should decode to exactly one global.
     ModuleResult result = DecodeModule(data, data + arraysize(data));
     EXPECT_TRUE(result.ok());
-    EXPECT_EQ(1, result.val->globals->size());
-    EXPECT_EQ(0, result.val->functions->size());
-    EXPECT_EQ(0, result.val->data_segments->size());
+    EXPECT_EQ(1, result.val->globals.size());
+    EXPECT_EQ(0, result.val->functions.size());
+    EXPECT_EQ(0, result.val->data_segments.size());
 
-    WasmGlobal* global = &result.val->globals->back();
+    WasmGlobal* global = &result.val->globals.back();
 
-    EXPECT_EQ(0, global->name_offset);
+    EXPECT_EQ(1, global->name_length);
     EXPECT_EQ(MachineType::Int32(), global->type);
     EXPECT_EQ(0, global->offset);
     EXPECT_FALSE(global->exported);
@@ -99,18 +141,14 @@
     if (result.val) delete result.val;
   }
 
-  for (size_t size = 1; size < arraysize(data); size++) {
-    // Should fall off end of module bytes.
-    ModuleResult result = DecodeModule(data, data + size);
-    EXPECT_FALSE(result.ok());
-    if (result.val) delete result.val;
-  }
+  EXPECT_OFF_END_FAILURE(data, 1, sizeof(data));
 }
 
 
 TEST_F(WasmModuleVerifyTest, ZeroGlobals) {
   static const byte data[] = {
-      kDeclGlobals, 0,  // declare 0 globals
+      SECTION(GLOBALS, 1),  // --
+      0,                    // declare 0 globals
   };
   ModuleResult result = DecodeModule(data, data + arraysize(data));
   EXPECT_TRUE(result.ok());
@@ -135,16 +173,22 @@
 
 TEST_F(WasmModuleVerifyTest, NGlobals) {
   static const byte data[] = {
-      0,       0, 0, 0,  // name offset
-      kMemI32,           // memory type
-      0,                 // exported
+      NO_NAME,  // name length
+      kMemI32,  // memory type
+      0,        // exported
   };
-  for (uint32_t i = 0; i < 1000000; i = i * 7 + 1) {
+
+  for (uint32_t i = 0; i < 1000000; i = i * 13 + 1) {
     std::vector<byte> buffer;
-    buffer.push_back(kDeclGlobals);
-    AppendUint32v(buffer, i);
+    size_t size =
+        WASM_SECTION_GLOBALS_SIZE + SizeOfVarInt(i) + i * sizeof(data);
+    const byte globals[] = {U32V_5(size), WASM_SECTION_GLOBALS};
+    for (size_t g = 0; g != sizeof(globals); ++g) {
+      buffer.push_back(globals[g]);
+    }
+    AppendUint32v(buffer, i);  // Number of globals.
     for (uint32_t j = 0; j < i; j++) {
-      buffer.insert(buffer.end(), data, data + arraysize(data));
+      buffer.insert(buffer.end(), data, data + sizeof(data));
     }
 
     ModuleResult result = DecodeModule(&buffer[0], &buffer[0] + buffer.size());
@@ -153,33 +197,25 @@
   }
 }
 
-
 TEST_F(WasmModuleVerifyTest, GlobalWithInvalidNameOffset) {
   static const byte data[] = {
-      kDeclGlobals,
-      1,  // declare one global
-      0,
-      3,
-      0,
-      0,        // name offset
-      kMemI32,  // memory type
+      SECTION(GLOBALS, 7),
+      1,        // declare one global
+      NO_NAME,  // name offset
+      33,       // memory type
       0,        // exported
   };
 
   EXPECT_FAILURE(data);
 }
 
-
 TEST_F(WasmModuleVerifyTest, GlobalWithInvalidMemoryType) {
   static const byte data[] = {
-      kDeclGlobals,
-      1,  // declare one global
-      0,
-      0,
-      0,
-      0,   // name offset
-      33,  // memory type
-      0,   // exported
+      SECTION(GLOBALS, 7),
+      1,        // declare one global
+      NO_NAME,  // name offset
+      33,       // memory type
+      0,        // exported
   };
 
   EXPECT_FAILURE(data);
@@ -188,18 +224,12 @@
 
 TEST_F(WasmModuleVerifyTest, TwoGlobals) {
   static const byte data[] = {
-      kDeclGlobals,
+      SECTION(GLOBALS, 13),
       2,
-      0,
-      0,
-      0,
-      0,        // #0: name offset
+      NO_NAME,  // #0: name length
       kMemF32,  // memory type
       0,        // exported
-      0,
-      0,
-      0,
-      0,        // #1: name offset
+      NO_NAME,  // #1: name length
       kMemF64,  // memory type
       1,        // exported
   };
@@ -208,19 +238,19 @@
     // Should decode to exactly two globals.
     ModuleResult result = DecodeModule(data, data + arraysize(data));
     EXPECT_TRUE(result.ok());
-    EXPECT_EQ(2, result.val->globals->size());
-    EXPECT_EQ(0, result.val->functions->size());
-    EXPECT_EQ(0, result.val->data_segments->size());
+    EXPECT_EQ(2, result.val->globals.size());
+    EXPECT_EQ(0, result.val->functions.size());
+    EXPECT_EQ(0, result.val->data_segments.size());
 
-    WasmGlobal* g0 = &result.val->globals->at(0);
-    WasmGlobal* g1 = &result.val->globals->at(1);
+    WasmGlobal* g0 = &result.val->globals[0];
+    WasmGlobal* g1 = &result.val->globals[1];
 
-    EXPECT_EQ(0, g0->name_offset);
+    EXPECT_EQ(0, g0->name_length);
     EXPECT_EQ(MachineType::Float32(), g0->type);
     EXPECT_EQ(0, g0->offset);
     EXPECT_FALSE(g0->exported);
 
-    EXPECT_EQ(0, g1->name_offset);
+    EXPECT_EQ(0, g1->name_length);
     EXPECT_EQ(MachineType::Float64(), g1->type);
     EXPECT_EQ(0, g1->offset);
     EXPECT_TRUE(g1->exported);
@@ -228,26 +258,28 @@
     if (result.val) delete result.val;
   }
 
-  for (size_t size = 1; size < arraysize(data); size++) {
-    // Should fall off end of module bytes.
-    ModuleResult result = DecodeModule(data, data + size);
-    EXPECT_FALSE(result.ok());
-    if (result.val) delete result.val;
-  }
+  EXPECT_OFF_END_FAILURE(data, 1, sizeof(data));
 }
 
 
 TEST_F(WasmModuleVerifyTest, OneSignature) {
-  static const byte data[] = {
-      kDeclSignatures, 1, 0, kLocalVoid  // void -> void
-  };
-  EXPECT_VERIFIES(data);
+  {
+    static const byte data[] = {SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE), 1,
+                                VOID_VOID_SIG};
+    EXPECT_VERIFIES(data);
+  }
+
+  {
+    static const byte data[] = {SECTION(SIGNATURES, 1 + INT_INT_SIG_SIZE), 1,
+                                INT_INT_SIG};
+    EXPECT_VERIFIES(data);
+  }
 }
 
 
 TEST_F(WasmModuleVerifyTest, MultipleSignatures) {
   static const byte data[] = {
-      kDeclSignatures,
+      SECTION(SIGNATURES, 10),
       3,
       0,
       kLocalVoid,  // void -> void
@@ -262,41 +294,36 @@
 
   ModuleResult result = DecodeModule(data, data + arraysize(data));
   EXPECT_TRUE(result.ok());
-  EXPECT_EQ(3, result.val->signatures->size());
-  if (result.val->signatures->size() == 3) {
-    EXPECT_EQ(0, result.val->signatures->at(0)->return_count());
-    EXPECT_EQ(1, result.val->signatures->at(1)->return_count());
-    EXPECT_EQ(1, result.val->signatures->at(2)->return_count());
+  EXPECT_EQ(3, result.val->signatures.size());
+  if (result.val->signatures.size() == 3) {
+    EXPECT_EQ(0, result.val->signatures[0]->return_count());
+    EXPECT_EQ(1, result.val->signatures[1]->return_count());
+    EXPECT_EQ(1, result.val->signatures[2]->return_count());
 
-    EXPECT_EQ(0, result.val->signatures->at(0)->parameter_count());
-    EXPECT_EQ(1, result.val->signatures->at(1)->parameter_count());
-    EXPECT_EQ(2, result.val->signatures->at(2)->parameter_count());
+    EXPECT_EQ(0, result.val->signatures[0]->parameter_count());
+    EXPECT_EQ(1, result.val->signatures[1]->parameter_count());
+    EXPECT_EQ(2, result.val->signatures[2]->parameter_count());
   }
   if (result.val) delete result.val;
 
-  for (size_t size = 1; size < arraysize(data); size++) {
-    ModuleResult result = DecodeModule(data, data + size);
-    // Should fall off the end of module bytes.
-    EXPECT_FALSE(result.ok());
-    if (result.val) delete result.val;
-  }
+  EXPECT_OFF_END_FAILURE(data, 1, sizeof(data));
 }
 
 
 TEST_F(WasmModuleVerifyTest, FunctionWithoutSig) {
   static const byte data[] = {
-      kDeclFunctions, 1,
+      SECTION(FUNCTIONS, 25), 1,
       // func#0 ------------------------------------------------------
-      0, 0,        // signature index
-      0, 0, 0, 0,  // name offset
-      0, 0, 0, 0,  // code start offset
-      0, 0, 0, 0,  // code end offset
-      1, 2,        // local int32 count
-      3, 4,        // local int64 count
-      5, 6,        // local float32 count
-      7, 8,        // local float64 count
-      0,           // exported
-      1            // external
+      SIG_INDEX(0),  // signature index
+      NO_NAME,       // name length
+      U32_LE(0),     // code start offset
+      U32_LE(0),     // code end offset
+      U16_LE(899),   // local int32 count
+      U16_LE(799),   // local int64 count
+      U16_LE(699),   // local float32 count
+      U16_LE(599),   // local float64 count
+      0,             // exported
+      1              // external
   };
 
   ModuleResult result = DecodeModule(data, data + arraysize(data));
@@ -306,23 +333,23 @@
 
 
 TEST_F(WasmModuleVerifyTest, OneEmptyVoidVoidFunction) {
-  const int kCodeStartOffset = 23;
+  const int kCodeStartOffset = 51;
   const int kCodeEndOffset = kCodeStartOffset + 1;
 
   static const byte data[] = {
-      kDeclSignatures, 1,
+      SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE), 1,
       // sig#0 -------------------------------------------------------
-      0, 0,  // void -> void
+      VOID_VOID_SIG,
       // func#0 ------------------------------------------------------
-      kDeclFunctions, 1,
-      kDeclFunctionLocals | kDeclFunctionExport | kDeclFunctionName, 0,
-      0,           // signature index
-      9, 0, 0, 0,  // name offset
-      11, 2,       // local int32 count
-      13, 4,       // local int64 count
-      15, 6,       // local float32 count
-      17, 8,       // local float64 count
-      1, 0,        // size
+      SECTION(FUNCTIONS, 19), 1,
+      kDeclFunctionLocals | kDeclFunctionExport | kDeclFunctionName,
+      SIG_INDEX(0),              // signature index
+      NAME_LENGTH(2), 'h', 'i',  // name
+      U16_LE(1466),              // local int32 count
+      U16_LE(1355),              // local int64 count
+      U16_LE(1244),              // local float32 count
+      U16_LE(1133),              // local float64 count
+      1, 0,                      // size
       kExprNop,
   };
 
@@ -330,22 +357,23 @@
     // Should decode to exactly one function.
     ModuleResult result = DecodeModule(data, data + arraysize(data));
     EXPECT_TRUE(result.ok());
-    EXPECT_EQ(0, result.val->globals->size());
-    EXPECT_EQ(1, result.val->signatures->size());
-    EXPECT_EQ(1, result.val->functions->size());
-    EXPECT_EQ(0, result.val->data_segments->size());
-    EXPECT_EQ(0, result.val->function_table->size());
+    EXPECT_EQ(0, result.val->globals.size());
+    EXPECT_EQ(1, result.val->signatures.size());
+    EXPECT_EQ(1, result.val->functions.size());
+    EXPECT_EQ(0, result.val->data_segments.size());
+    EXPECT_EQ(0, result.val->function_table.size());
 
-    WasmFunction* function = &result.val->functions->back();
+    WasmFunction* function = &result.val->functions.back();
 
-    EXPECT_EQ(9, function->name_offset);
+    EXPECT_EQ(39, function->name_offset);
+    EXPECT_EQ(2, function->name_length);
     EXPECT_EQ(kCodeStartOffset, function->code_start_offset);
     EXPECT_EQ(kCodeEndOffset, function->code_end_offset);
 
-    EXPECT_EQ(523, function->local_i32_count);
-    EXPECT_EQ(1037, function->local_i64_count);
-    EXPECT_EQ(1551, function->local_f32_count);
-    EXPECT_EQ(2065, function->local_f64_count);
+    EXPECT_EQ(1466, function->local_i32_count);
+    EXPECT_EQ(1355, function->local_i64_count);
+    EXPECT_EQ(1244, function->local_f32_count);
+    EXPECT_EQ(1133, function->local_f64_count);
 
     EXPECT_TRUE(function->exported);
     EXPECT_FALSE(function->external);
@@ -353,32 +381,26 @@
     if (result.val) delete result.val;
   }
 
-  for (size_t size = 5; size < arraysize(data); size++) {
-    // Should fall off end of module bytes.
-    ModuleResult result = DecodeModule(data, data + size);
-    EXPECT_FALSE(result.ok());
-    if (result.val) delete result.val;
-  }
+  EXPECT_OFF_END_FAILURE(data, 16, sizeof(data));
 }
 
 
 TEST_F(WasmModuleVerifyTest, OneFunctionImported) {
   static const byte data[] = {
-      kDeclSignatures, 1,
+      SECTION(SIGNATURES, VOID_VOID_SIG_SIZE), 1,
       // sig#0 -------------------------------------------------------
-      0, 0,  // void -> void
-      kDeclFunctions, 1,
+      VOID_VOID_SIG, SECTION(FUNCTIONS, 6), 1,
       // func#0 ------------------------------------------------------
       kDeclFunctionImport,  // no name, no locals, imported
-      0, 0,                 // signature index
+      SIG_INDEX(0),
   };
 
   ModuleResult result = DecodeModule(data, data + arraysize(data));
   EXPECT_TRUE(result.ok());
-  EXPECT_EQ(1, result.val->functions->size());
-  WasmFunction* function = &result.val->functions->back();
+  EXPECT_EQ(1, result.val->functions.size());
+  WasmFunction* function = &result.val->functions.back();
 
-  EXPECT_EQ(0, function->name_offset);
+  EXPECT_EQ(0, function->name_length);
   EXPECT_EQ(0, function->code_start_offset);
   EXPECT_EQ(0, function->code_end_offset);
 
@@ -393,16 +415,15 @@
   if (result.val) delete result.val;
 }
 
-
 TEST_F(WasmModuleVerifyTest, OneFunctionWithNopBody) {
-  static const byte kCodeStartOffset = 11;
+  static const byte kCodeStartOffset = 40;
   static const byte kCodeEndOffset = kCodeStartOffset + 1;
 
   static const byte data[] = {
-      kDeclSignatures, 1,
+      SECTION(SIGNATURES, 3), 1,
       // sig#0 -------------------------------------------------------
       0, 0,  // void -> void
-      kDeclFunctions, 1,
+      SECTION(FUNCTIONS, 7), 1,
       // func#0 ------------------------------------------------------
       0,        // no name, no locals
       0, 0,     // signature index
@@ -412,10 +433,10 @@
 
   ModuleResult result = DecodeModule(data, data + arraysize(data));
   EXPECT_TRUE(result.ok());
-  EXPECT_EQ(1, result.val->functions->size());
-  WasmFunction* function = &result.val->functions->back();
+  EXPECT_EQ(1, result.val->functions.size());
+  WasmFunction* function = &result.val->functions.back();
 
-  EXPECT_EQ(0, function->name_offset);
+  EXPECT_EQ(0, function->name_length);
   EXPECT_EQ(kCodeStartOffset, function->code_start_offset);
   EXPECT_EQ(kCodeEndOffset, function->code_end_offset);
 
@@ -432,14 +453,14 @@
 
 
 TEST_F(WasmModuleVerifyTest, OneFunctionWithNopBody_WithLocals) {
-  static const byte kCodeStartOffset = 19;
+  static const byte kCodeStartOffset = 48;
   static const byte kCodeEndOffset = kCodeStartOffset + 1;
 
   static const byte data[] = {
-      kDeclSignatures, 1,
+      SECTION(SIGNATURES, 3), 1,
       // sig#0 -------------------------------------------------------
       0, 0,  // void -> void
-      kDeclFunctions, 1,
+      SECTION(FUNCTIONS, 15), 1,
       // func#0 ------------------------------------------------------
       kDeclFunctionLocals, 0, 0,  // signature index
       1, 2,                       // local int32 count
@@ -452,10 +473,10 @@
 
   ModuleResult result = DecodeModule(data, data + arraysize(data));
   EXPECT_TRUE(result.ok());
-  EXPECT_EQ(1, result.val->functions->size());
-  WasmFunction* function = &result.val->functions->back();
+  EXPECT_EQ(1, result.val->functions.size());
+  WasmFunction* function = &result.val->functions.back();
 
-  EXPECT_EQ(0, function->name_offset);
+  EXPECT_EQ(0, function->name_length);
   EXPECT_EQ(kCodeStartOffset, function->code_start_offset);
   EXPECT_EQ(kCodeEndOffset, function->code_end_offset);
 
@@ -472,67 +493,68 @@
 
 
 TEST_F(WasmModuleVerifyTest, OneGlobalOneFunctionWithNopBodyOneDataSegment) {
-  static const byte kDeclMemorySize = 4;
-  static const byte kCodeStartOffset =
-      2 + kDeclMemorySize + kDeclGlobalSize + 4 + 2 + 17;
+  static const byte kCodeStartOffset = 75;
   static const byte kCodeEndOffset = kCodeStartOffset + 3;
+  static const byte kDataSegmentSourceOffset = kCodeEndOffset + 20;
 
   static const byte data[] = {
-      kDeclMemory, 28, 28, 1,
+      SECTION(MEMORY, 3), 28, 28, 1,
       // global#0 --------------------------------------------------
-      kDeclGlobals, 1, 0, 0, 0, 0,  // name offset
-      kMemU8,                       // memory type
-      0,                            // exported
+      SECTION(GLOBALS, 7), 1,
+      0,       // name length
+      kMemU8,  // memory type
+      0,       // exported
       // sig#0 -----------------------------------------------------
-      kDeclSignatures, 1, 0, 0,  // void -> void
+      SECTION(SIGNATURES, 3), 1, 0, 0,  // void -> void
       // func#0 ----------------------------------------------------
-      kDeclFunctions, 1, kDeclFunctionLocals | kDeclFunctionName, 0,
-      0,           // signature index
-      9, 0, 0, 0,  // name offset
-      1, 2,        // local int32 count
-      3, 4,        // local int64 count
-      5, 6,        // local float32 count
-      7, 8,        // local float64 count
-      3, 0,        // body size
-      kExprNop,    // func#0 body
-      kExprNop,    // func#0 body
-      kExprNop,    // func#0 body
+      SECTION(FUNCTIONS, 20), 1, kDeclFunctionLocals | kDeclFunctionName, 0,
+      0,            // signature index
+      2, 'h', 'i',  // name
+      1, 2,         // local int32 count
+      3, 4,         // local int64 count
+      5, 6,         // local float32 count
+      7, 8,         // local float64 count
+      3, 0,         // body size
+      kExprNop,     // func#0 body
+      kExprNop,     // func#0 body
+      kExprNop,     // func#0 body
       // segment#0 -------------------------------------------------
-      kDeclDataSegments, 1, 0xae, 0xb3, 0x08, 0,  // dest addr
-      15, 0, 0, 0,                                // source offset
-      5, 0, 0, 0,                                 // source size
-      1,                                          // init
+      SECTION(DATA_SEGMENTS, 14), 1,
+      U32V_3(0x8b3ae),  // dest addr
+      U32V_1(5),        // source size
+      0, 1, 2, 3, 4,    // data bytes
       // rest ------------------------------------------------------
-      kDeclEnd,
+      SECTION(END, 0),
   };
 
   {
     ModuleResult result = DecodeModule(data, data + arraysize(data));
     EXPECT_TRUE(result.ok());
-    EXPECT_EQ(1, result.val->globals->size());
-    EXPECT_EQ(1, result.val->functions->size());
-    EXPECT_EQ(1, result.val->data_segments->size());
+    EXPECT_EQ(1, result.val->globals.size());
+    EXPECT_EQ(1, result.val->functions.size());
+    EXPECT_EQ(1, result.val->data_segments.size());
 
-    WasmGlobal* global = &result.val->globals->back();
+    WasmGlobal* global = &result.val->globals.back();
 
-    EXPECT_EQ(0, global->name_offset);
+    EXPECT_EQ(0, global->name_length);
     EXPECT_EQ(MachineType::Uint8(), global->type);
     EXPECT_EQ(0, global->offset);
     EXPECT_FALSE(global->exported);
 
-    WasmFunction* function = &result.val->functions->back();
+    WasmFunction* function = &result.val->functions.back();
 
-    EXPECT_EQ(9, function->name_offset);
+    EXPECT_EQ(63, function->name_offset);
+    EXPECT_EQ(2, function->name_length);
     EXPECT_EQ(kCodeStartOffset, function->code_start_offset);
     EXPECT_EQ(kCodeEndOffset, function->code_end_offset);
 
     EXPECT_FALSE(function->exported);
     EXPECT_FALSE(function->external);
 
-    WasmDataSegment* segment = &result.val->data_segments->back();
+    WasmDataSegment* segment = &result.val->data_segments.back();
 
     EXPECT_EQ(0x8b3ae, segment->dest_addr);
-    EXPECT_EQ(15, segment->source_offset);
+    EXPECT_EQ(kDataSegmentSourceOffset, segment->source_offset);
     EXPECT_EQ(5, segment->source_size);
     EXPECT_TRUE(segment->init);
 
@@ -542,147 +564,119 @@
 
 
 TEST_F(WasmModuleVerifyTest, OneDataSegment) {
+  const byte kDataSegmentSourceOffset = 39;
   const byte data[] = {
-      kDeclMemory, 28, 28, 1, kDeclDataSegments, 1, 0xaa, 0xbb, 0x09,
-      0,  // dest addr
-      11,          0,  0,
-      0,  // source offset
-      3,           0,  0,
-      0,  // source size
-      1,  // init
+      SECTION(MEMORY, 3),
+      28,
+      28,
+      1,
+      SECTION(DATA_SEGMENTS, 8),
+      1,
+      U32V_3(0x9bbaa),  // dest addr
+      U32V_1(3),        // source size
+      'a',
+      'b',
+      'c'  // data bytes
   };
 
   {
     EXPECT_VERIFIES(data);
     ModuleResult result = DecodeModule(data, data + arraysize(data));
     EXPECT_TRUE(result.ok());
-    EXPECT_EQ(0, result.val->globals->size());
-    EXPECT_EQ(0, result.val->functions->size());
-    EXPECT_EQ(1, result.val->data_segments->size());
+    EXPECT_EQ(0, result.val->globals.size());
+    EXPECT_EQ(0, result.val->functions.size());
+    EXPECT_EQ(1, result.val->data_segments.size());
 
-    WasmDataSegment* segment = &result.val->data_segments->back();
+    WasmDataSegment* segment = &result.val->data_segments.back();
 
     EXPECT_EQ(0x9bbaa, segment->dest_addr);
-    EXPECT_EQ(11, segment->source_offset);
+    EXPECT_EQ(kDataSegmentSourceOffset, segment->source_offset);
     EXPECT_EQ(3, segment->source_size);
     EXPECT_TRUE(segment->init);
 
     if (result.val) delete result.val;
   }
 
-  for (size_t size = 5; size < arraysize(data); size++) {
-    // Should fall off end of module bytes.
-    ModuleResult result = DecodeModule(data, data + size);
-    EXPECT_FALSE(result.ok());
-    if (result.val) delete result.val;
-  }
+  EXPECT_OFF_END_FAILURE(data, 13, sizeof(data));
 }
 
 
 TEST_F(WasmModuleVerifyTest, TwoDataSegments) {
+  const byte kDataSegment0SourceOffset = 39;
+  const byte kDataSegment1SourceOffset = 39 + 8;
+
   const byte data[] = {
-      kDeclMemory, 28,   28,   1, kDeclDataSegments, 2, 0xee, 0xff, 0x07,
-      0,  // dest addr
-      9,           0,    0,
-      0,  // #0: source offset
-      4,           0,    0,
-      0,  // source size
-      0,  // init
-      0xcc,        0xdd, 0x06,
-      0,  // #1: dest addr
-      6,           0,    0,
-      0,  // source offset
-      10,          0,    0,
-      0,  // source size
-      1,  // init
+      SECTION(MEMORY, 3),
+      28,
+      28,
+      1,
+      SECTION(DATA_SEGMENTS, 31),
+      2,                // segment count
+      U32V_3(0x7ffee),  // #0: dest addr
+      U32V_1(4),        // source size
+      1,
+      2,
+      3,
+      4,                // data bytes
+      U32V_3(0x6ddcc),  // #1: dest addr
+      U32V_1(10),       // source size
+      1,
+      2,
+      3,
+      4,
+      5,
+      6,
+      7,
+      8,
+      9,
+      10  // data bytes
   };
 
   {
     ModuleResult result = DecodeModule(data, data + arraysize(data));
     EXPECT_TRUE(result.ok());
-    EXPECT_EQ(0, result.val->globals->size());
-    EXPECT_EQ(0, result.val->functions->size());
-    EXPECT_EQ(2, result.val->data_segments->size());
+    EXPECT_EQ(0, result.val->globals.size());
+    EXPECT_EQ(0, result.val->functions.size());
+    EXPECT_EQ(2, result.val->data_segments.size());
 
-    WasmDataSegment* s0 = &result.val->data_segments->at(0);
-    WasmDataSegment* s1 = &result.val->data_segments->at(1);
+    WasmDataSegment* s0 = &result.val->data_segments[0];
+    WasmDataSegment* s1 = &result.val->data_segments[1];
 
     EXPECT_EQ(0x7ffee, s0->dest_addr);
-    EXPECT_EQ(9, s0->source_offset);
+    EXPECT_EQ(kDataSegment0SourceOffset, s0->source_offset);
     EXPECT_EQ(4, s0->source_size);
-    EXPECT_FALSE(s0->init);
+    EXPECT_TRUE(s0->init);
 
     EXPECT_EQ(0x6ddcc, s1->dest_addr);
-    EXPECT_EQ(6, s1->source_offset);
+    EXPECT_EQ(kDataSegment1SourceOffset, s1->source_offset);
     EXPECT_EQ(10, s1->source_size);
     EXPECT_TRUE(s1->init);
 
     if (result.val) delete result.val;
   }
 
-  for (size_t size = 5; size < arraysize(data); size++) {
-    // Should fall off end of module bytes.
-    ModuleResult result = DecodeModule(data, data + size);
-    EXPECT_FALSE(result.ok());
-    if (result.val) delete result.val;
-  }
+  EXPECT_OFF_END_FAILURE(data, 13, sizeof(data));
 }
 
-
-TEST_F(WasmModuleVerifyTest, DataSegmentWithInvalidSource) {
-  const int dest_addr = 0x100;
-  const byte mem_size_log2 = 15;
-  const int kDataSize = 19;
-
-  for (int source_offset = 0; source_offset < 5 + kDataSize; source_offset++) {
-    for (int source_size = -1; source_size < 5 + kDataSize; source_size += 3) {
-      byte data[] = {
-          kDeclMemory,
-          mem_size_log2,
-          mem_size_log2,
-          1,
-          kDeclDataSegments,
-          1,
-          U32_LE(dest_addr),
-          U32_LE(source_offset),
-          U32_LE(source_size),
-          1,  // init
-      };
-
-      STATIC_ASSERT(kDataSize == arraysize(data));
-
-      if (source_offset < kDataSize && source_size >= 0 &&
-          (source_offset + source_size) <= kDataSize) {
-        EXPECT_VERIFIES(data);
-      } else {
-        EXPECT_FAILURE(data);
-      }
-    }
-  }
-}
-
-
 TEST_F(WasmModuleVerifyTest, DataSegmentWithInvalidDest) {
   const int source_size = 3;
-  const int source_offset = 11;
 
-  for (byte mem_size_log2 = 12; mem_size_log2 < 20; mem_size_log2++) {
-    int mem_size = 1 << mem_size_log2;
+  for (byte mem_pages = 1; mem_pages < 16; mem_pages++) {
+    int mem_size = mem_pages * 0x10000;  // 64k pages.
 
     for (int dest_addr = mem_size - source_size;
          dest_addr < mem_size + source_size; dest_addr++) {
-      byte data[] = {
-          kDeclMemory,
-          mem_size_log2,
-          mem_size_log2,
-          1,
-          kDeclDataSegments,
-          1,
-          U32_LE(dest_addr),
-          U32_LE(source_offset),
-          U32_LE(source_size),
-          1,  // init
-      };
+      byte data[] = {SECTION(MEMORY, 3),
+                     mem_pages,
+                     mem_pages,
+                     1,
+                     SECTION(DATA_SEGMENTS, 14),
+                     1,
+                     U32V_3(dest_addr),
+                     U32V_1(source_size),
+                     'a',
+                     'b',
+                     'c'};
 
       if (dest_addr <= (mem_size - source_size)) {
         EXPECT_VERIFIES(data);
@@ -695,27 +689,24 @@
 
 
 // To make below tests for indirect calls much shorter.
-#define FUNCTION(sig_index, external)                \
-  kDeclFunctionImport, static_cast<byte>(sig_index), \
-      static_cast<byte>(sig_index >> 8)
-
+#define FUNCTION(sig_index, external) kDeclFunctionImport, SIG_INDEX(sig_index)
 
 TEST_F(WasmModuleVerifyTest, OneIndirectFunction) {
   static const byte data[] = {
       // sig#0 -------------------------------------------------------
-      kDeclSignatures, 1, 0, 0,  // void -> void
+      SECTION(SIGNATURES, 3), 1, 0, 0,  // void -> void
       // func#0 ------------------------------------------------------
-      kDeclFunctions, 1, FUNCTION(0, 0),
+      SECTION(FUNCTIONS, 4), 1, FUNCTION(0, 0),
       // indirect table ----------------------------------------------
-      kDeclFunctionTable, 1, 0, 0};
+      SECTION(FUNCTION_TABLE, 2), 1, U32V_1(0)};
 
   ModuleResult result = DecodeModule(data, data + arraysize(data));
   EXPECT_TRUE(result.ok());
   if (result.ok()) {
-    EXPECT_EQ(1, result.val->signatures->size());
-    EXPECT_EQ(1, result.val->functions->size());
-    EXPECT_EQ(1, result.val->function_table->size());
-    EXPECT_EQ(0, result.val->function_table->at(0));
+    EXPECT_EQ(1, result.val->signatures.size());
+    EXPECT_EQ(1, result.val->functions.size());
+    EXPECT_EQ(1, result.val->function_table.size());
+    EXPECT_EQ(0, result.val->function_table[0]);
   }
   if (result.val) delete result.val;
 }
@@ -724,23 +715,33 @@
 TEST_F(WasmModuleVerifyTest, MultipleIndirectFunctions) {
   static const byte data[] = {
       // sig#0 -------------------------------------------------------
-      kDeclSignatures, 2, 0, 0,  // void -> void
-      0, kLocalI32,              // void -> i32
+      SECTION(SIGNATURES, 5), 2, 0, 0,  // void -> void
+      0, kLocalI32,                     // void -> i32
       // func#0 ------------------------------------------------------
-      kDeclFunctions, 4, FUNCTION(0, 1), FUNCTION(1, 1), FUNCTION(0, 1),
-      FUNCTION(1, 1),
+      SECTION(FUNCTIONS, 13), 4, FUNCTION(0, 1),  // --
+      FUNCTION(1, 1),                             // --
+      FUNCTION(0, 1),                             // --
+      FUNCTION(1, 1),                             // --
       // indirect table ----------------------------------------------
-      kDeclFunctionTable, 8, 0, 0, 1, 0, 2, 0, 3, 0, 0, 0, 1, 0, 2, 0, 3, 0,
+      SECTION(FUNCTION_TABLE, 9), 8,
+      U32V_1(0),  // --
+      U32V_1(1),  // --
+      U32V_1(2),  // --
+      U32V_1(3),  // --
+      U32V_1(0),  // --
+      U32V_1(1),  // --
+      U32V_1(2),  // --
+      U32V_1(3),  // --
   };
 
   ModuleResult result = DecodeModule(data, data + arraysize(data));
   EXPECT_TRUE(result.ok());
   if (result.ok()) {
-    EXPECT_EQ(2, result.val->signatures->size());
-    EXPECT_EQ(4, result.val->functions->size());
-    EXPECT_EQ(8, result.val->function_table->size());
+    EXPECT_EQ(2, result.val->signatures.size());
+    EXPECT_EQ(4, result.val->functions.size());
+    EXPECT_EQ(8, result.val->function_table.size());
     for (int i = 0; i < 8; i++) {
-      EXPECT_EQ(i & 3, result.val->function_table->at(i));
+      EXPECT_EQ(i & 3, result.val->function_table[i]);
     }
   }
   if (result.val) delete result.val;
@@ -750,9 +751,9 @@
 TEST_F(WasmModuleVerifyTest, IndirectFunctionNoFunctions) {
   static const byte data[] = {
       // sig#0 -------------------------------------------------------
-      kDeclSignatures, 1, 0, 0,  // void -> void
+      SECTION(SIGNATURES, 3), 1, 0, 0,  // void -> void
       // indirect table ----------------------------------------------
-      kDeclFunctionTable, 1, 0, 0,
+      SECTION(FUNCTION_TABLE, 3), 1, 0, 0,
   };
 
   EXPECT_FAILURE(data);
@@ -762,11 +763,11 @@
 TEST_F(WasmModuleVerifyTest, IndirectFunctionInvalidIndex) {
   static const byte data[] = {
       // sig#0 -------------------------------------------------------
-      kDeclSignatures, 1, 0, 0,  // void -> void
+      SECTION(SIGNATURES, 3), 1, 0, 0,  // void -> void
       // functions ---------------------------------------------------
-      kDeclFunctions, 1, FUNCTION(0, 1),
+      SECTION(FUNCTIONS, 4), 1, FUNCTION(0, 1),
       // indirect table ----------------------------------------------
-      kDeclFunctionTable, 1, 1, 0,
+      SECTION(FUNCTION_TABLE, 3), 1, 1, 0,
   };
 
   EXPECT_FAILURE(data);
@@ -778,7 +779,8 @@
 
 TEST_F(WasmSignatureDecodeTest, Ok_v_v) {
   static const byte data[] = {0, 0};
-  Zone zone;
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
   FunctionSig* sig =
       DecodeWasmSignatureForTesting(&zone, data, data + arraysize(data));
 
@@ -906,10 +908,11 @@
 TEST_F(WasmFunctionVerifyTest, Ok_v_v_empty) {
   static const byte data[] = {
       0,       kLocalVoid,  // signature
-      3,       0,           // local int32 count
-      4,       0,           // local int64 count
-      5,       0,           // local float32 count
-      6,       0,           // local float64 count
+      4,                    // locals
+      3,       kLocalI32,   // --
+      4,       kLocalI64,   // --
+      5,       kLocalF32,   // --
+      6,       kLocalF64,   // --
       kExprNop              // body
   };
 
@@ -922,12 +925,9 @@
     EXPECT_EQ(0, function->sig->parameter_count());
     EXPECT_EQ(0, function->sig->return_count());
     EXPECT_EQ(0, function->name_offset);
-    EXPECT_EQ(arraysize(data) - 1, function->code_start_offset);
+    EXPECT_EQ(2, function->code_start_offset);
     EXPECT_EQ(arraysize(data), function->code_end_offset);
-    EXPECT_EQ(3, function->local_i32_count);
-    EXPECT_EQ(4, function->local_i64_count);
-    EXPECT_EQ(5, function->local_f32_count);
-    EXPECT_EQ(6, function->local_f64_count);
+    // TODO(titzer): verify encoding of local declarations
     EXPECT_FALSE(function->external);
     EXPECT_FALSE(function->exported);
   }
@@ -935,156 +935,445 @@
   if (result.val) delete result.val;
 }
 
+TEST_F(WasmModuleVerifyTest, SectionWithoutNameLength) {
+  const byte data[] = {1};
+  EXPECT_FAILURE(data);
+}
 
-TEST_F(WasmModuleVerifyTest, WLLSectionNoLen) {
+TEST_F(WasmModuleVerifyTest, TheLoneliestOfValidModulesTheTrulyEmptyOne) {
   const byte data[] = {
-      kDeclWLL,  // section without length.
+      1,  // Section size.
+      0,  // Empty section name.
+          // No section name, no content, nothing but sadness.
+  };
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, OnlyUnknownSectionEmpty) {
+  const byte data[] = {
+      5,                      // Section size.
+      4, 'l', 'u', 'l', 'z',  // unknown section.
+  };
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, OnlyUnknownSectionNonEmpty) {
+  const byte data[] = {
+      10,                     // Section size.
+      4, 'l', 'u', 'l', 'z',  // unknown section.
+      // Section content:
+      0xff, 0xff, 0xff, 0xff, 0xff,
+  };
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, SignatureFollowedByEmptyUnknownSection) {
+  const byte data[] = {
+      SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE), 1, VOID_VOID_SIG,
+      // -----------------------------------------------------------
+      5,                      // Section size.
+      4, 'l', 'u', 'l', 'z',  // unknown section.
+  };
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, SignatureFollowedByUnknownSection) {
+  const byte data[] = {
+      SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE), 1, VOID_VOID_SIG,
+      // -----------------------------------------------------------
+      10,                     // Section size.
+      4, 'l', 'u', 'l', 'z',  // unknown section.
+      0xff, 0xff, 0xff, 0xff, 0xff,
+  };
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, SignatureFollowedByUnknownSectionWithLongLEB) {
+  const byte data[] = {
+      SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE), 1, VOID_VOID_SIG,
+      // -----------------------------------------------------------
+      0x85, 0x80, 0x80, 0x80, 0x00,  // Section size: 1 but in a 5-byte LEB.
+      4, 'l', 'u', 'l', 'z',         // unknown section.
+  };
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, UnknownSectionOverflow) {
+  static const byte data[] = {
+      13,                                // Section size.
+      1,                                 // Section name length.
+      '\0',                              // Section name.
+      1,    2, 3, 4, 5, 6, 7, 8, 9, 10,  // 10 byte section
   };
   EXPECT_FAILURE(data);
 }
 
-
-TEST_F(WasmModuleVerifyTest, WLLSectionEmpty) {
+TEST_F(WasmModuleVerifyTest, UnknownSectionUnderflow) {
   static const byte data[] = {
-      kDeclWLL, 0,  // empty section
-  };
-  ModuleResult result = DecodeModule(data, data + arraysize(data));
-  EXPECT_TRUE(result.ok());
-  if (result.val) delete result.val;
-}
-
-
-TEST_F(WasmModuleVerifyTest, WLLSectionOne) {
-  static const byte data[] = {
-      kDeclWLL,
-      1,  // LEB128 1
-      0,  // one byte section
-  };
-  ModuleResult result = DecodeModule(data, data + arraysize(data));
-  EXPECT_TRUE(result.ok());
-  if (result.val) delete result.val;
-}
-
-
-TEST_F(WasmModuleVerifyTest, WLLSectionTen) {
-  static const byte data[] = {
-      kDeclWLL,
-      10,                                    // LEB128 10
-      1,        2, 3, 4, 5, 6, 7, 8, 9, 10,  // 10 byte section
-  };
-  ModuleResult result = DecodeModule(data, data + arraysize(data));
-  EXPECT_TRUE(result.ok());
-  if (result.val) delete result.val;
-}
-
-
-TEST_F(WasmModuleVerifyTest, WLLSectionOverflow) {
-  static const byte data[] = {
-      kDeclWLL,
-      11,                                    // LEB128 11
-      1,        2, 3, 4, 5, 6, 7, 8, 9, 10,  // 10 byte section
+      0xff, 0xff, 0xff, 0xff, 0x0f,  // Section size LEB128 0xffffffff
+      1,    '\0',                    // Section name and name length.
+      1,    2,    3,    4,           // 4 byte section
   };
   EXPECT_FAILURE(data);
 }
 
-
-TEST_F(WasmModuleVerifyTest, WLLSectionUnderflow) {
-  static const byte data[] = {
-      kDeclWLL, 0xff, 0xff, 0xff, 0xff, 0x0f,  // LEB128 0xffffffff
-      1,        2,    3,    4,                 // 4 byte section
-  };
-  EXPECT_FAILURE(data);
-}
-
-
-TEST_F(WasmModuleVerifyTest, WLLSectionLoop) {
+TEST_F(WasmModuleVerifyTest, UnknownSectionLoop) {
   // Would infinite loop decoding if wrapping and allowed.
   static const byte data[] = {
-      kDeclWLL, 0xfa, 0xff, 0xff, 0xff, 0x0f,  // LEB128 0xfffffffa
-      1,        2,    3,    4,                 // 4 byte section
+      0xfa, 0xff, 0xff, 0xff, 0x0f,  // Section size LEB128 0xfffffffa
+      1,    '\0',                    // Section name and name length.
+      1,    2,    3,    4,           // 4 byte section
   };
   EXPECT_FAILURE(data);
 }
 
+TEST_F(WasmModuleVerifyTest, UnknownSectionSkipped) {
+  static const byte data[] = {
+      3,  // Section size.
+      1,
+      '\0',  // Section name: LEB128 1, string '\0'
+      0,     // one byte section
+      SECTION(GLOBALS, 7),
+      1,
+      0,        // name length
+      kMemI32,  // memory type
+      0,        // exported
+  };
+  ModuleResult result = DecodeModule(data, data + arraysize(data));
+  EXPECT_TRUE(result.ok());
+
+  EXPECT_EQ(1, result.val->globals.size());
+  EXPECT_EQ(0, result.val->functions.size());
+  EXPECT_EQ(0, result.val->data_segments.size());
+
+  WasmGlobal* global = &result.val->globals.back();
+
+  EXPECT_EQ(0, global->name_length);
+  EXPECT_EQ(MachineType::Int32(), global->type);
+  EXPECT_EQ(0, global->offset);
+  EXPECT_FALSE(global->exported);
+
+  if (result.val) delete result.val;
+}
+
 TEST_F(WasmModuleVerifyTest, ImportTable_empty) {
-  static const byte data[] = {kDeclSignatures, 0, kDeclImportTable, 0};
+  static const byte data[] = {SECTION(SIGNATURES, 1), 0,
+                              SECTION(IMPORT_TABLE, 1), 0};
   EXPECT_VERIFIES(data);
 }
 
 TEST_F(WasmModuleVerifyTest, ImportTable_nosigs) {
-  static const byte data[] = {kDeclImportTable, 0};
+  static const byte data[] = {SECTION(IMPORT_TABLE, 1), 0};
   EXPECT_FAILURE(data);
 }
 
 TEST_F(WasmModuleVerifyTest, ImportTable_invalid_sig) {
   static const byte data[] = {
-      kDeclSignatures,
-      0,
-      kDeclImportTable,
-      1,
-      0,
-      0,  // sig index
-      1,
-      0,
-      0,
-      0,  // module name
-      1,
-      0,
-      0,
-      0  // function name
+      SECTION(SIGNATURES, 1), 0,   SECTION(IMPORT_TABLE, 6), 1,
+      IMPORT_SIG_INDEX(0),          // sig index
+      NAME_LENGTH(1),         'm',  // module name
+      NAME_LENGTH(1),         'f',  // function name
   };
   EXPECT_FAILURE(data);
 }
 
 TEST_F(WasmModuleVerifyTest, ImportTable_one_sig) {
   static const byte data[] = {
-      kDeclSignatures,
+      SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE),
       1,
-      0,
-      static_cast<byte>(kAstStmt),
-      kDeclImportTable,
-      1,
-      0,
-      0,  // sig index
-      1,
-      0,
-      0,
-      0,  // module name
-      1,
-      0,
-      0,
-      0  // function name
+      VOID_VOID_SIG,
+      SECTION(IMPORT_TABLE, 6),
+      1,                    // --
+      IMPORT_SIG_INDEX(0),  // sig index
+      NAME_LENGTH(1),
+      'm',  // module name
+      NAME_LENGTH(1),
+      'f',  // function name
   };
   EXPECT_VERIFIES(data);
 }
 
+TEST_F(WasmModuleVerifyTest, ImportTable_invalid_module) {
+  static const byte data[] = {
+      SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE),
+      1,
+      VOID_VOID_SIG,
+      SECTION(IMPORT_TABLE, 6),
+      1,                    // --
+      IMPORT_SIG_INDEX(0),  // sig index
+      NO_NAME,              // module name
+      NAME_LENGTH(1),
+      'f'  // function name
+  };
+  EXPECT_FAILURE(data);
+}
+
 TEST_F(WasmModuleVerifyTest, ImportTable_off_end) {
   static const byte data[] = {
-      kDeclSignatures,
+      SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE),
       1,
-      0,
-      static_cast<byte>(kAstStmt),
-      kDeclImportTable,
+      VOID_VOID_SIG,
+      SECTION(IMPORT_TABLE, 6),
       1,
-      0,
-      0,  // sig index
-      1,
-      0,
-      0,
-      0,  // module name
-      1,
-      0,
-      0,
-      0  // function name
+      IMPORT_SIG_INDEX(0),  // sig index
+      NAME_LENGTH(1),
+      'm',  // module name
+      NAME_LENGTH(1),
+      'f',  // function name
   };
 
-  for (size_t length = 5; length < sizeof(data); length++) {
+  EXPECT_OFF_END_FAILURE(data, 16, sizeof(data));
+}
+
+TEST_F(WasmModuleVerifyTest, ExportTable_empty1) {
+  static const byte data[] = {SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE),
+                              1,
+                              VOID_VOID_SIG,
+                              SECTION(FUNCTIONS, 1 + EMPTY_FUNCTION_SIZE),
+                              1,
+                              EMPTY_FUNCTION(0),
+                              SECTION(EXPORT_TABLE, 1),
+                              0};
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, ExportTable_empty2) {
+  static const byte data[] = {SECTION(SIGNATURES, 1),   0,
+                              SECTION(FUNCTIONS, 1),    0,
+                              SECTION(EXPORT_TABLE, 1), 0};
+  // TODO(titzer): current behavior treats empty functions section as missing.
+  EXPECT_FAILURE(data);
+}
+
+TEST_F(WasmModuleVerifyTest, ExportTable_NoFunctions1) {
+  static const byte data[] = {SECTION(SIGNATURES, 1), 0,
+                              SECTION(EXPORT_TABLE, 1), 0};
+  EXPECT_FAILURE(data);
+}
+
+TEST_F(WasmModuleVerifyTest, ExportTable_NoFunctions2) {
+  static const byte data[] = {SECTION(EXPORT_TABLE, 1), 0};
+  EXPECT_FAILURE(data);
+}
+
+TEST_F(WasmModuleVerifyTest, ExportTableOne) {
+  static const byte data[] = {
+      SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE),
+      1,              // sigs
+      VOID_VOID_SIG,  // --
+      SECTION(FUNCTIONS, 1 + EMPTY_FUNCTION_SIZE),
+      1,                  // functions
+      EMPTY_FUNCTION(0),  // --
+      SECTION(EXPORT_TABLE, 7),
+      1,              // exports
+      FUNC_INDEX(0),  // --
+      NO_NAME         // --
+  };
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, ExportTableTwo) {
+  static const byte data[] = {
+      SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE),
+      1,              // sigs
+      VOID_VOID_SIG,  // --
+      SECTION(FUNCTIONS, 1 + EMPTY_FUNCTION_SIZE),
+      1,                  // functions
+      EMPTY_FUNCTION(0),  // --
+      SECTION(EXPORT_TABLE, 12),
+      2,              // exports
+      FUNC_INDEX(0),  // --
+      NAME_LENGTH(4),
+      'n',
+      'a',
+      'm',
+      'e',            // --
+      FUNC_INDEX(0),  // --
+      NAME_LENGTH(3),
+      'n',
+      'o',
+      'm'  // --
+  };
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, ExportTableThree) {
+  static const byte data[] = {
+      SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE),
+      1,              // sigs
+      VOID_VOID_SIG,  // --
+      SECTION(FUNCTIONS, 1 + 3 * EMPTY_FUNCTION_SIZE),
+      3,                  // functions
+      EMPTY_FUNCTION(0),  // --
+      EMPTY_FUNCTION(0),  // --
+      EMPTY_FUNCTION(0),  // --
+      SECTION(EXPORT_TABLE, 10),
+      3,              // exports
+      FUNC_INDEX(0),  // --
+      NAME_LENGTH(1),
+      'a',            // --
+      FUNC_INDEX(1),  // --
+      NAME_LENGTH(1),
+      'b',            // --
+      FUNC_INDEX(2),  // --
+      NAME_LENGTH(1),
+      'c'  // --
+  };
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, ExportTableThreeOne) {
+  for (int i = 0; i < 6; i++) {
+    const byte data[] = {
+        SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE),
+        1,              // sigs
+        VOID_VOID_SIG,  // --
+        SECTION(FUNCTIONS, 1 + 3 * EMPTY_FUNCTION_SIZE),
+        3,                  // functions
+        EMPTY_FUNCTION(0),  // --
+        EMPTY_FUNCTION(0),  // --
+        EMPTY_FUNCTION(0),  // --
+        SECTION(EXPORT_TABLE, 5),
+        1,              // exports
+        FUNC_INDEX(i),  // --
+        NAME_LENGTH(2),
+        'e',
+        'x',  // --
+    };
+
+    if (i < 3) {
+      EXPECT_VERIFIES(data);
+    } else {
+      EXPECT_FAILURE(data);
+    }
+  }
+}
+
+TEST_F(WasmModuleVerifyTest, ExportTableOne_off_end) {
+  static const byte data[] = {
+      SECTION(SIGNATURES, 1 + VOID_VOID_SIG_SIZE),
+      1,              // sigs
+      VOID_VOID_SIG,  // --
+      SECTION(FUNCTIONS, 1 + EMPTY_FUNCTION_SIZE),
+      1,                  // functions
+      EMPTY_FUNCTION(0),  // --
+      SECTION(EXPORT_TABLE, 1 + 6),
+      1,              // exports
+      FUNC_INDEX(0),  // --
+      NO_NAME         // --
+  };
+
+  for (int length = 33; length < sizeof(data); length++) {
     ModuleResult result = DecodeModule(data, data + length);
     EXPECT_FALSE(result.ok());
     if (result.val) delete result.val;
   }
 }
 
+#define SIGNATURES_SECTION(count, ...) \
+  SECTION(SIGNATURES, 1 + 3 * (count)), U32V_1(count), __VA_ARGS__
+#define FUNCTION_SIGNATURES_SECTION(count, ...) \
+  SECTION(FUNCTION_SIGNATURES, 1 + (count)), U32V_1(count), __VA_ARGS__
+
+#define FOO_STRING 3, 'f', 'o', 'o'
+#define NO_LOCAL_NAMES 0
+
+#define EMPTY_SIGNATURES_SECTION SECTION(SIGNATURES, 1), 0
+#define EMPTY_FUNCTION_SIGNATURES_SECTION SECTION(FUNCTION_SIGNATURES, 1), 0
+#define EMPTY_FUNCTION_BODIES_SECTION SECTION(FUNCTION_BODIES, 1), 0
+#define EMPTY_NAMES_SECTION SECTION(NAMES, 1), 0
+
+TEST_F(WasmModuleVerifyTest, FunctionSignatures_empty) {
+  static const byte data[] = {SECTION(SIGNATURES, 1), 0,
+                              SECTION(FUNCTION_SIGNATURES, 1), 0};
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, FunctionSignatures_one) {
+  static const byte data[] = {SIGNATURES_SECTION(1, VOID_VOID_SIG),
+                              FUNCTION_SIGNATURES_SECTION(1, 0)};
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, FunctionBodies_empty) {
+  static const byte data[] = {EMPTY_SIGNATURES_SECTION,
+                              EMPTY_FUNCTION_SIGNATURES_SECTION,
+                              EMPTY_FUNCTION_BODIES_SECTION};
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, FunctionBodies_one_empty) {
+  static const byte data[] = {
+      SIGNATURES_SECTION(1, VOID_VOID_SIG), FUNCTION_SIGNATURES_SECTION(1, 0),
+      SECTION(FUNCTION_BODIES, 1 + EMPTY_BODY_SIZE), 1, EMPTY_BODY};
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, FunctionBodies_one_nop) {
+  static const byte data[] = {
+      SIGNATURES_SECTION(1, VOID_VOID_SIG), FUNCTION_SIGNATURES_SECTION(1, 0),
+      SECTION(FUNCTION_BODIES, 1 + NOP_BODY_SIZE), 1, NOP_BODY};
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, FunctionBodies_count_mismatch1) {
+  static const byte data[] = {SIGNATURES_SECTION(1, VOID_VOID_SIG),
+                              FUNCTION_SIGNATURES_SECTION(2, 0, 0),
+                              SECTION(FUNCTION_BODIES, 1 + EMPTY_BODY_SIZE), 1,
+                              EMPTY_BODY};
+  EXPECT_FAILURE(data);
+}
+
+TEST_F(WasmModuleVerifyTest, FunctionBodies_count_mismatch2) {
+  static const byte data[] = {SIGNATURES_SECTION(1, VOID_VOID_SIG),
+                              FUNCTION_SIGNATURES_SECTION(1, 0),
+                              SECTION(FUNCTION_BODIES, 1 + 2 * NOP_BODY_SIZE),
+                              2,
+                              NOP_BODY,
+                              NOP_BODY};
+  EXPECT_FAILURE(data);
+}
+
+TEST_F(WasmModuleVerifyTest, Names_empty) {
+  static const byte data[] = {
+      EMPTY_SIGNATURES_SECTION, EMPTY_FUNCTION_SIGNATURES_SECTION,
+      EMPTY_FUNCTION_BODIES_SECTION, EMPTY_NAMES_SECTION};
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, Names_one_empty) {
+  static const byte data[] = {
+      SIGNATURES_SECTION(1, VOID_VOID_SIG),  // --
+      FUNCTION_SIGNATURES_SECTION(1, 0),     // --
+      SECTION(FUNCTION_BODIES, 1 + EMPTY_BODY_SIZE),
+      1,
+      EMPTY_BODY,  // --
+      SECTION(NAMES, 1 + 5),
+      1,
+      FOO_STRING,
+      NO_LOCAL_NAMES  // --
+  };
+  EXPECT_VERIFIES(data);
+}
+
+TEST_F(WasmModuleVerifyTest, Names_two_empty) {
+  static const byte data[] = {
+      SIGNATURES_SECTION(1, VOID_VOID_SIG),               // --
+      FUNCTION_SIGNATURES_SECTION(2, 0, 0),               // --
+      SECTION(FUNCTION_BODIES, 1 + 2 * EMPTY_BODY_SIZE),  // --
+      2,
+      EMPTY_BODY,
+      EMPTY_BODY,  // --
+      SECTION(NAMES, 1 + 10),
+      2,  // --
+      FOO_STRING,
+      NO_LOCAL_NAMES,  // --
+      FOO_STRING,
+      NO_LOCAL_NAMES,  // --
+  };
+  EXPECT_VERIFIES(data);
+}
+
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
diff --git a/test/unittests/wasm/wasm-macro-gen-unittest.cc b/test/unittests/wasm/wasm-macro-gen-unittest.cc
index f3f604b..ec188c0 100644
--- a/test/unittests/wasm/wasm-macro-gen-unittest.cc
+++ b/test/unittests/wasm/wasm-macro-gen-unittest.cc
@@ -26,14 +26,18 @@
   EXPECT_SIZE(2, WASM_I8(122));
   EXPECT_SIZE(2, WASM_I8(254));
 
-  EXPECT_SIZE(5, WASM_I32(1));
-  EXPECT_SIZE(5, WASM_I32(10000));
-  EXPECT_SIZE(5, WASM_I32(-9828934));
+  EXPECT_SIZE(2, WASM_I32V_1(1));
+  EXPECT_SIZE(3, WASM_I32V_2(200));
+  EXPECT_SIZE(4, WASM_I32V_3(10000));
+  EXPECT_SIZE(5, WASM_I32V_4(-9828934));
+  EXPECT_SIZE(6, WASM_I32V_5(-1119828934));
 
-  EXPECT_SIZE(9, WASM_I64(1));
-  EXPECT_SIZE(9, WASM_I64(10000));
-  EXPECT_SIZE(9, WASM_I64(-9828934));
-  EXPECT_SIZE(9, WASM_I64(0x123456789abcdef0ULL));
+  EXPECT_SIZE(2, WASM_I64V_1(1));
+  EXPECT_SIZE(3, WASM_I64V_2(300));
+  EXPECT_SIZE(4, WASM_I64V_3(10000));
+  EXPECT_SIZE(5, WASM_I64V_4(-9828934));
+  EXPECT_SIZE(6, WASM_I64V_5(-1119828934));
+  EXPECT_SIZE(10, WASM_I64V_9(0x123456789abcdef0ULL));
 
   EXPECT_SIZE(5, WASM_F32(1.0f));
   EXPECT_SIZE(5, WASM_F32(10000.0f));
@@ -52,7 +56,7 @@
 
   EXPECT_SIZE(4, WASM_STORE_GLOBAL(0, WASM_ZERO));
 
-  EXPECT_SIZE(6, WASM_STORE_MEM(MachineType::Int32(), WASM_ZERO, WASM_ZERO));
+  EXPECT_SIZE(7, WASM_STORE_MEM(MachineType::Int32(), WASM_ZERO, WASM_ZERO));
 
   EXPECT_SIZE(4, WASM_IF(WASM_ZERO, WASM_NOP));
 
@@ -92,17 +96,8 @@
   EXPECT_SIZE(3, WASM_CONTINUE(0));
 }
 
-
-TEST_F(WasmMacroGenTest, TableSwitch) {
-  EXPECT_SIZE(2, WASM_CASE(9));
-  EXPECT_SIZE(2, WASM_CASE_BR(11));
-
-  EXPECT_SIZE(7, WASM_TABLESWITCH_OP(0, 1, WASM_CASE(7)));
-  EXPECT_SIZE(9, WASM_TABLESWITCH_OP(0, 2, WASM_CASE(7), WASM_CASE(8)));
-
-  EXPECT_SIZE(4, WASM_TABLESWITCH_BODY(WASM_I8(88), WASM_I8(77)));
-  EXPECT_SIZE(
-      6, WASM_TABLESWITCH_BODY(WASM_I8(33), WASM_I8(44), WASM_GET_LOCAL(0)));
+TEST_F(WasmMacroGenTest, BrTable) {
+  EXPECT_SIZE(8, WASM_BR_TABLE(WASM_ZERO, 1, BR_TARGET(1)));
 }
 
 
@@ -113,9 +108,9 @@
   EXPECT_SIZE(2, WASM_LOAD_GLOBAL(0));
   EXPECT_SIZE(2, WASM_LOAD_GLOBAL(1));
   EXPECT_SIZE(2, WASM_LOAD_GLOBAL(12));
-  EXPECT_SIZE(4, WASM_LOAD_MEM(MachineType::Int32(), WASM_ZERO));
-  EXPECT_SIZE(4, WASM_LOAD_MEM(MachineType::Float64(), WASM_ZERO));
-  EXPECT_SIZE(4, WASM_LOAD_MEM(MachineType::Float32(), WASM_ZERO));
+  EXPECT_SIZE(5, WASM_LOAD_MEM(MachineType::Int32(), WASM_ZERO));
+  EXPECT_SIZE(5, WASM_LOAD_MEM(MachineType::Float64(), WASM_ZERO));
+  EXPECT_SIZE(5, WASM_LOAD_MEM(MachineType::Float32(), WASM_ZERO));
 
   EXPECT_SIZE(3, WASM_NOT(WASM_ZERO));
 
@@ -173,6 +168,8 @@
   EXPECT_SIZE(5, WASM_I32_SHL(WASM_ZERO, WASM_ZERO));
   EXPECT_SIZE(5, WASM_I32_SHR(WASM_ZERO, WASM_ZERO));
   EXPECT_SIZE(5, WASM_I32_SAR(WASM_ZERO, WASM_ZERO));
+  EXPECT_SIZE(5, WASM_I32_ROR(WASM_ZERO, WASM_ZERO));
+  EXPECT_SIZE(5, WASM_I32_ROL(WASM_ZERO, WASM_ZERO));
   EXPECT_SIZE(5, WASM_I32_EQ(WASM_ZERO, WASM_ZERO));
 
   EXPECT_SIZE(5, WASM_I32_LTS(WASM_ZERO, WASM_ZERO));
@@ -188,6 +185,8 @@
   EXPECT_SIZE(3, WASM_I32_CLZ(WASM_ZERO));
   EXPECT_SIZE(3, WASM_I32_CTZ(WASM_ZERO));
   EXPECT_SIZE(3, WASM_I32_POPCNT(WASM_ZERO));
+
+  EXPECT_SIZE(3, WASM_I32_EQZ(WASM_ZERO));
 }
 
 
@@ -205,6 +204,8 @@
   EXPECT_SIZE(5, WASM_I64_SHL(WASM_ZERO, WASM_ZERO));
   EXPECT_SIZE(5, WASM_I64_SHR(WASM_ZERO, WASM_ZERO));
   EXPECT_SIZE(5, WASM_I64_SAR(WASM_ZERO, WASM_ZERO));
+  EXPECT_SIZE(5, WASM_I64_ROR(WASM_ZERO, WASM_ZERO));
+  EXPECT_SIZE(5, WASM_I64_ROL(WASM_ZERO, WASM_ZERO));
   EXPECT_SIZE(5, WASM_I64_EQ(WASM_ZERO, WASM_ZERO));
 
   EXPECT_SIZE(5, WASM_I64_LTS(WASM_ZERO, WASM_ZERO));
@@ -220,6 +221,8 @@
   EXPECT_SIZE(3, WASM_I64_CLZ(WASM_ZERO));
   EXPECT_SIZE(3, WASM_I64_CTZ(WASM_ZERO));
   EXPECT_SIZE(3, WASM_I64_POPCNT(WASM_ZERO));
+
+  EXPECT_SIZE(3, WASM_I64_EQZ(WASM_ZERO));
 }
 
 
@@ -307,10 +310,10 @@
 
 TEST_F(WasmMacroGenTest, LoadsAndStores) {
   for (size_t i = 0; i < arraysize(kMemTypes); i++) {
-    EXPECT_SIZE(4, WASM_LOAD_MEM(kMemTypes[i], WASM_ZERO));
+    EXPECT_SIZE(5, WASM_LOAD_MEM(kMemTypes[i], WASM_ZERO));
   }
   for (size_t i = 0; i < arraysize(kMemTypes); i++) {
-    EXPECT_SIZE(6, WASM_STORE_MEM(kMemTypes[i], WASM_ZERO, WASM_GET_LOCAL(0)));
+    EXPECT_SIZE(7, WASM_STORE_MEM(kMemTypes[i], WASM_ZERO, WASM_GET_LOCAL(0)));
   }
 }