Update V8 to r5388 as required by WebKit r66666
Change-Id: Ib3c42e9b7226d22c65c7077c543fe31afe62a318
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
new file mode 100644
index 0000000..c75b945
--- /dev/null
+++ b/src/x64/code-stubs-x64.cc
@@ -0,0 +1,4015 @@
+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "v8.h"
+
+#if defined(V8_TARGET_ARCH_X64)
+
+#include "bootstrapper.h"
+#include "code-stubs.h"
+#include "regexp-macro-assembler.h"
+
+namespace v8 {
+namespace internal {
+
+#define __ ACCESS_MASM(masm)
+void FastNewClosureStub::Generate(MacroAssembler* masm) {
+ // Create a new closure from the given function info in new
+ // space. Set the context to the current context in rsi.
+ Label gc;
+ __ AllocateInNewSpace(JSFunction::kSize, rax, rbx, rcx, &gc, TAG_OBJECT);
+
+ // Get the function info from the stack.
+ __ movq(rdx, Operand(rsp, 1 * kPointerSize));
+
+ // Compute the function map in the current global context and set that
+ // as the map of the allocated object.
+ __ movq(rcx, Operand(rsi, Context::SlotOffset(Context::GLOBAL_INDEX)));
+ __ movq(rcx, FieldOperand(rcx, GlobalObject::kGlobalContextOffset));
+ __ movq(rcx, Operand(rcx, Context::SlotOffset(Context::FUNCTION_MAP_INDEX)));
+ __ movq(FieldOperand(rax, JSObject::kMapOffset), rcx);
+
+ // Initialize the rest of the function. We don't have to update the
+ // write barrier because the allocated object is in new space.
+ __ LoadRoot(rbx, Heap::kEmptyFixedArrayRootIndex);
+ __ LoadRoot(rcx, Heap::kTheHoleValueRootIndex);
+ __ movq(FieldOperand(rax, JSObject::kPropertiesOffset), rbx);
+ __ movq(FieldOperand(rax, JSObject::kElementsOffset), rbx);
+ __ movq(FieldOperand(rax, JSFunction::kPrototypeOrInitialMapOffset), rcx);
+ __ movq(FieldOperand(rax, JSFunction::kSharedFunctionInfoOffset), rdx);
+ __ movq(FieldOperand(rax, JSFunction::kContextOffset), rsi);
+ __ movq(FieldOperand(rax, JSFunction::kLiteralsOffset), rbx);
+
+ // Initialize the code pointer in the function to be the one
+ // found in the shared function info object.
+ __ movq(rdx, FieldOperand(rdx, SharedFunctionInfo::kCodeOffset));
+ __ lea(rdx, FieldOperand(rdx, Code::kHeaderSize));
+ __ movq(FieldOperand(rax, JSFunction::kCodeEntryOffset), rdx);
+
+
+ // Return and remove the on-stack parameter.
+ __ ret(1 * kPointerSize);
+
+ // Create a new closure through the slower runtime call.
+ __ bind(&gc);
+ __ pop(rcx); // Temporarily remove return address.
+ __ pop(rdx);
+ __ push(rsi);
+ __ push(rdx);
+ __ push(rcx); // Restore return address.
+ __ TailCallRuntime(Runtime::kNewClosure, 2, 1);
+}
+
+
+void FastNewContextStub::Generate(MacroAssembler* masm) {
+ // Try to allocate the context in new space.
+ Label gc;
+ int length = slots_ + Context::MIN_CONTEXT_SLOTS;
+ __ AllocateInNewSpace((length * kPointerSize) + FixedArray::kHeaderSize,
+ rax, rbx, rcx, &gc, TAG_OBJECT);
+
+ // Get the function from the stack.
+ __ movq(rcx, Operand(rsp, 1 * kPointerSize));
+
+ // Setup the object header.
+ __ LoadRoot(kScratchRegister, Heap::kContextMapRootIndex);
+ __ movq(FieldOperand(rax, HeapObject::kMapOffset), kScratchRegister);
+ __ Move(FieldOperand(rax, FixedArray::kLengthOffset), Smi::FromInt(length));
+
+ // Setup the fixed slots.
+ __ xor_(rbx, rbx); // Set to NULL.
+ __ movq(Operand(rax, Context::SlotOffset(Context::CLOSURE_INDEX)), rcx);
+ __ movq(Operand(rax, Context::SlotOffset(Context::FCONTEXT_INDEX)), rax);
+ __ movq(Operand(rax, Context::SlotOffset(Context::PREVIOUS_INDEX)), rbx);
+ __ movq(Operand(rax, Context::SlotOffset(Context::EXTENSION_INDEX)), rbx);
+
+ // Copy the global object from the surrounding context.
+ __ movq(rbx, Operand(rsi, Context::SlotOffset(Context::GLOBAL_INDEX)));
+ __ movq(Operand(rax, Context::SlotOffset(Context::GLOBAL_INDEX)), rbx);
+
+ // Initialize the rest of the slots to undefined.
+ __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
+ for (int i = Context::MIN_CONTEXT_SLOTS; i < length; i++) {
+ __ movq(Operand(rax, Context::SlotOffset(i)), rbx);
+ }
+
+ // Return and remove the on-stack parameter.
+ __ movq(rsi, rax);
+ __ ret(1 * kPointerSize);
+
+ // Need to collect. Call into runtime system.
+ __ bind(&gc);
+ __ TailCallRuntime(Runtime::kNewContext, 1, 1);
+}
+
+
+void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
+ // Stack layout on entry:
+ //
+ // [rsp + kPointerSize]: constant elements.
+ // [rsp + (2 * kPointerSize)]: literal index.
+ // [rsp + (3 * kPointerSize)]: literals array.
+
+ // All sizes here are multiples of kPointerSize.
+ int elements_size = (length_ > 0) ? FixedArray::SizeFor(length_) : 0;
+ int size = JSArray::kSize + elements_size;
+
+ // Load boilerplate object into rcx and check if we need to create a
+ // boilerplate.
+ Label slow_case;
+ __ movq(rcx, Operand(rsp, 3 * kPointerSize));
+ __ movq(rax, Operand(rsp, 2 * kPointerSize));
+ SmiIndex index = masm->SmiToIndex(rax, rax, kPointerSizeLog2);
+ __ movq(rcx,
+ FieldOperand(rcx, index.reg, index.scale, FixedArray::kHeaderSize));
+ __ CompareRoot(rcx, Heap::kUndefinedValueRootIndex);
+ __ j(equal, &slow_case);
+
+ if (FLAG_debug_code) {
+ const char* message;
+ Heap::RootListIndex expected_map_index;
+ if (mode_ == CLONE_ELEMENTS) {
+ message = "Expected (writable) fixed array";
+ expected_map_index = Heap::kFixedArrayMapRootIndex;
+ } else {
+ ASSERT(mode_ == COPY_ON_WRITE_ELEMENTS);
+ message = "Expected copy-on-write fixed array";
+ expected_map_index = Heap::kFixedCOWArrayMapRootIndex;
+ }
+ __ push(rcx);
+ __ movq(rcx, FieldOperand(rcx, JSArray::kElementsOffset));
+ __ CompareRoot(FieldOperand(rcx, HeapObject::kMapOffset),
+ expected_map_index);
+ __ Assert(equal, message);
+ __ pop(rcx);
+ }
+
+ // Allocate both the JS array and the elements array in one big
+ // allocation. This avoids multiple limit checks.
+ __ AllocateInNewSpace(size, rax, rbx, rdx, &slow_case, TAG_OBJECT);
+
+ // Copy the JS array part.
+ for (int i = 0; i < JSArray::kSize; i += kPointerSize) {
+ if ((i != JSArray::kElementsOffset) || (length_ == 0)) {
+ __ movq(rbx, FieldOperand(rcx, i));
+ __ movq(FieldOperand(rax, i), rbx);
+ }
+ }
+
+ if (length_ > 0) {
+ // Get hold of the elements array of the boilerplate and setup the
+ // elements pointer in the resulting object.
+ __ movq(rcx, FieldOperand(rcx, JSArray::kElementsOffset));
+ __ lea(rdx, Operand(rax, JSArray::kSize));
+ __ movq(FieldOperand(rax, JSArray::kElementsOffset), rdx);
+
+ // Copy the elements array.
+ for (int i = 0; i < elements_size; i += kPointerSize) {
+ __ movq(rbx, FieldOperand(rcx, i));
+ __ movq(FieldOperand(rdx, i), rbx);
+ }
+ }
+
+ // Return and remove the on-stack parameters.
+ __ ret(3 * kPointerSize);
+
+ __ bind(&slow_case);
+ __ TailCallRuntime(Runtime::kCreateArrayLiteralShallow, 3, 1);
+}
+
+
+void ToBooleanStub::Generate(MacroAssembler* masm) {
+ Label false_result, true_result, not_string;
+ __ movq(rax, Operand(rsp, 1 * kPointerSize));
+
+ // 'null' => false.
+ __ CompareRoot(rax, Heap::kNullValueRootIndex);
+ __ j(equal, &false_result);
+
+ // Get the map and type of the heap object.
+ // We don't use CmpObjectType because we manipulate the type field.
+ __ movq(rdx, FieldOperand(rax, HeapObject::kMapOffset));
+ __ movzxbq(rcx, FieldOperand(rdx, Map::kInstanceTypeOffset));
+
+ // Undetectable => false.
+ __ movzxbq(rbx, FieldOperand(rdx, Map::kBitFieldOffset));
+ __ and_(rbx, Immediate(1 << Map::kIsUndetectable));
+ __ j(not_zero, &false_result);
+
+ // JavaScript object => true.
+ __ cmpq(rcx, Immediate(FIRST_JS_OBJECT_TYPE));
+ __ j(above_equal, &true_result);
+
+ // String value => false iff empty.
+ __ cmpq(rcx, Immediate(FIRST_NONSTRING_TYPE));
+ __ j(above_equal, ¬_string);
+ __ movq(rdx, FieldOperand(rax, String::kLengthOffset));
+ __ SmiTest(rdx);
+ __ j(zero, &false_result);
+ __ jmp(&true_result);
+
+ __ bind(¬_string);
+ __ CompareRoot(rdx, Heap::kHeapNumberMapRootIndex);
+ __ j(not_equal, &true_result);
+ // HeapNumber => false iff +0, -0, or NaN.
+ // These three cases set the zero flag when compared to zero using ucomisd.
+ __ xorpd(xmm0, xmm0);
+ __ ucomisd(xmm0, FieldOperand(rax, HeapNumber::kValueOffset));
+ __ j(zero, &false_result);
+ // Fall through to |true_result|.
+
+ // Return 1/0 for true/false in rax.
+ __ bind(&true_result);
+ __ movq(rax, Immediate(1));
+ __ ret(1 * kPointerSize);
+ __ bind(&false_result);
+ __ xor_(rax, rax);
+ __ ret(1 * kPointerSize);
+}
+
+
+const char* GenericBinaryOpStub::GetName() {
+ if (name_ != NULL) return name_;
+ const int kMaxNameLength = 100;
+ name_ = Bootstrapper::AllocateAutoDeletedArray(kMaxNameLength);
+ if (name_ == NULL) return "OOM";
+ const char* op_name = Token::Name(op_);
+ const char* overwrite_name;
+ switch (mode_) {
+ case NO_OVERWRITE: overwrite_name = "Alloc"; break;
+ case OVERWRITE_RIGHT: overwrite_name = "OverwriteRight"; break;
+ case OVERWRITE_LEFT: overwrite_name = "OverwriteLeft"; break;
+ default: overwrite_name = "UnknownOverwrite"; break;
+ }
+
+ OS::SNPrintF(Vector<char>(name_, kMaxNameLength),
+ "GenericBinaryOpStub_%s_%s%s_%s%s_%s_%s",
+ op_name,
+ overwrite_name,
+ (flags_ & NO_SMI_CODE_IN_STUB) ? "_NoSmiInStub" : "",
+ args_in_registers_ ? "RegArgs" : "StackArgs",
+ args_reversed_ ? "_R" : "",
+ static_operands_type_.ToString(),
+ BinaryOpIC::GetName(runtime_operands_type_));
+ return name_;
+}
+
+
+void GenericBinaryOpStub::GenerateCall(
+ MacroAssembler* masm,
+ Register left,
+ Register right) {
+ if (!ArgsInRegistersSupported()) {
+ // Pass arguments on the stack.
+ __ push(left);
+ __ push(right);
+ } else {
+ // The calling convention with registers is left in rdx and right in rax.
+ Register left_arg = rdx;
+ Register right_arg = rax;
+ if (!(left.is(left_arg) && right.is(right_arg))) {
+ if (left.is(right_arg) && right.is(left_arg)) {
+ if (IsOperationCommutative()) {
+ SetArgsReversed();
+ } else {
+ __ xchg(left, right);
+ }
+ } else if (left.is(left_arg)) {
+ __ movq(right_arg, right);
+ } else if (right.is(right_arg)) {
+ __ movq(left_arg, left);
+ } else if (left.is(right_arg)) {
+ if (IsOperationCommutative()) {
+ __ movq(left_arg, right);
+ SetArgsReversed();
+ } else {
+ // Order of moves important to avoid destroying left argument.
+ __ movq(left_arg, left);
+ __ movq(right_arg, right);
+ }
+ } else if (right.is(left_arg)) {
+ if (IsOperationCommutative()) {
+ __ movq(right_arg, left);
+ SetArgsReversed();
+ } else {
+ // Order of moves important to avoid destroying right argument.
+ __ movq(right_arg, right);
+ __ movq(left_arg, left);
+ }
+ } else {
+ // Order of moves is not important.
+ __ movq(left_arg, left);
+ __ movq(right_arg, right);
+ }
+ }
+
+ // Update flags to indicate that arguments are in registers.
+ SetArgsInRegisters();
+ __ IncrementCounter(&Counters::generic_binary_stub_calls_regs, 1);
+ }
+
+ // Call the stub.
+ __ CallStub(this);
+}
+
+
+void GenericBinaryOpStub::GenerateCall(
+ MacroAssembler* masm,
+ Register left,
+ Smi* right) {
+ if (!ArgsInRegistersSupported()) {
+ // Pass arguments on the stack.
+ __ push(left);
+ __ Push(right);
+ } else {
+ // The calling convention with registers is left in rdx and right in rax.
+ Register left_arg = rdx;
+ Register right_arg = rax;
+ if (left.is(left_arg)) {
+ __ Move(right_arg, right);
+ } else if (left.is(right_arg) && IsOperationCommutative()) {
+ __ Move(left_arg, right);
+ SetArgsReversed();
+ } else {
+ // For non-commutative operations, left and right_arg might be
+ // the same register. Therefore, the order of the moves is
+ // important here in order to not overwrite left before moving
+ // it to left_arg.
+ __ movq(left_arg, left);
+ __ Move(right_arg, right);
+ }
+
+ // Update flags to indicate that arguments are in registers.
+ SetArgsInRegisters();
+ __ IncrementCounter(&Counters::generic_binary_stub_calls_regs, 1);
+ }
+
+ // Call the stub.
+ __ CallStub(this);
+}
+
+
+void GenericBinaryOpStub::GenerateCall(
+ MacroAssembler* masm,
+ Smi* left,
+ Register right) {
+ if (!ArgsInRegistersSupported()) {
+ // Pass arguments on the stack.
+ __ Push(left);
+ __ push(right);
+ } else {
+ // The calling convention with registers is left in rdx and right in rax.
+ Register left_arg = rdx;
+ Register right_arg = rax;
+ if (right.is(right_arg)) {
+ __ Move(left_arg, left);
+ } else if (right.is(left_arg) && IsOperationCommutative()) {
+ __ Move(right_arg, left);
+ SetArgsReversed();
+ } else {
+ // For non-commutative operations, right and left_arg might be
+ // the same register. Therefore, the order of the moves is
+ // important here in order to not overwrite right before moving
+ // it to right_arg.
+ __ movq(right_arg, right);
+ __ Move(left_arg, left);
+ }
+ // Update flags to indicate that arguments are in registers.
+ SetArgsInRegisters();
+ __ IncrementCounter(&Counters::generic_binary_stub_calls_regs, 1);
+ }
+
+ // Call the stub.
+ __ CallStub(this);
+}
+
+
+class FloatingPointHelper : public AllStatic {
+ public:
+ // Load the operands from rdx and rax into xmm0 and xmm1, as doubles.
+ // If the operands are not both numbers, jump to not_numbers.
+ // Leaves rdx and rax unchanged. SmiOperands assumes both are smis.
+ // NumberOperands assumes both are smis or heap numbers.
+ static void LoadSSE2SmiOperands(MacroAssembler* masm);
+ static void LoadSSE2NumberOperands(MacroAssembler* masm);
+ static void LoadSSE2UnknownOperands(MacroAssembler* masm,
+ Label* not_numbers);
+
+ // Takes the operands in rdx and rax and loads them as integers in rax
+ // and rcx.
+ static void LoadAsIntegers(MacroAssembler* masm,
+ Label* operand_conversion_failure,
+ Register heap_number_map);
+ // As above, but we know the operands to be numbers. In that case,
+ // conversion can't fail.
+ static void LoadNumbersAsIntegers(MacroAssembler* masm);
+};
+
+
+void GenericBinaryOpStub::GenerateSmiCode(MacroAssembler* masm, Label* slow) {
+ // 1. Move arguments into rdx, rax except for DIV and MOD, which need the
+ // dividend in rax and rdx free for the division. Use rax, rbx for those.
+ Comment load_comment(masm, "-- Load arguments");
+ Register left = rdx;
+ Register right = rax;
+ if (op_ == Token::DIV || op_ == Token::MOD) {
+ left = rax;
+ right = rbx;
+ if (HasArgsInRegisters()) {
+ __ movq(rbx, rax);
+ __ movq(rax, rdx);
+ }
+ }
+ if (!HasArgsInRegisters()) {
+ __ movq(right, Operand(rsp, 1 * kPointerSize));
+ __ movq(left, Operand(rsp, 2 * kPointerSize));
+ }
+
+ Label not_smis;
+ // 2. Smi check both operands.
+ if (static_operands_type_.IsSmi()) {
+ // Skip smi check if we know that both arguments are smis.
+ if (FLAG_debug_code) {
+ __ AbortIfNotSmi(left);
+ __ AbortIfNotSmi(right);
+ }
+ if (op_ == Token::BIT_OR) {
+ // Handle OR here, since we do extra smi-checking in the or code below.
+ __ SmiOr(right, right, left);
+ GenerateReturn(masm);
+ return;
+ }
+ } else {
+ if (op_ != Token::BIT_OR) {
+ // Skip the check for OR as it is better combined with the
+ // actual operation.
+ Comment smi_check_comment(masm, "-- Smi check arguments");
+ __ JumpIfNotBothSmi(left, right, ¬_smis);
+ }
+ }
+
+ // 3. Operands are both smis (except for OR), perform the operation leaving
+ // the result in rax and check the result if necessary.
+ Comment perform_smi(masm, "-- Perform smi operation");
+ Label use_fp_on_smis;
+ switch (op_) {
+ case Token::ADD: {
+ ASSERT(right.is(rax));
+ __ SmiAdd(right, right, left, &use_fp_on_smis); // ADD is commutative.
+ break;
+ }
+
+ case Token::SUB: {
+ __ SmiSub(left, left, right, &use_fp_on_smis);
+ __ movq(rax, left);
+ break;
+ }
+
+ case Token::MUL:
+ ASSERT(right.is(rax));
+ __ SmiMul(right, right, left, &use_fp_on_smis); // MUL is commutative.
+ break;
+
+ case Token::DIV:
+ ASSERT(left.is(rax));
+ __ SmiDiv(left, left, right, &use_fp_on_smis);
+ break;
+
+ case Token::MOD:
+ ASSERT(left.is(rax));
+ __ SmiMod(left, left, right, slow);
+ break;
+
+ case Token::BIT_OR:
+ ASSERT(right.is(rax));
+ __ movq(rcx, right); // Save the right operand.
+ __ SmiOr(right, right, left); // BIT_OR is commutative.
+ __ testb(right, Immediate(kSmiTagMask));
+ __ j(not_zero, ¬_smis);
+ break;
+
+ case Token::BIT_AND:
+ ASSERT(right.is(rax));
+ __ SmiAnd(right, right, left); // BIT_AND is commutative.
+ break;
+
+ case Token::BIT_XOR:
+ ASSERT(right.is(rax));
+ __ SmiXor(right, right, left); // BIT_XOR is commutative.
+ break;
+
+ case Token::SHL:
+ case Token::SHR:
+ case Token::SAR:
+ switch (op_) {
+ case Token::SAR:
+ __ SmiShiftArithmeticRight(left, left, right);
+ break;
+ case Token::SHR:
+ __ SmiShiftLogicalRight(left, left, right, slow);
+ break;
+ case Token::SHL:
+ __ SmiShiftLeft(left, left, right);
+ break;
+ default:
+ UNREACHABLE();
+ }
+ __ movq(rax, left);
+ break;
+
+ default:
+ UNREACHABLE();
+ break;
+ }
+
+ // 4. Emit return of result in rax.
+ GenerateReturn(masm);
+
+ // 5. For some operations emit inline code to perform floating point
+ // operations on known smis (e.g., if the result of the operation
+ // overflowed the smi range).
+ switch (op_) {
+ case Token::ADD:
+ case Token::SUB:
+ case Token::MUL:
+ case Token::DIV: {
+ ASSERT(use_fp_on_smis.is_linked());
+ __ bind(&use_fp_on_smis);
+ if (op_ == Token::DIV) {
+ __ movq(rdx, rax);
+ __ movq(rax, rbx);
+ }
+ // left is rdx, right is rax.
+ __ AllocateHeapNumber(rbx, rcx, slow);
+ FloatingPointHelper::LoadSSE2SmiOperands(masm);
+ switch (op_) {
+ case Token::ADD: __ addsd(xmm0, xmm1); break;
+ case Token::SUB: __ subsd(xmm0, xmm1); break;
+ case Token::MUL: __ mulsd(xmm0, xmm1); break;
+ case Token::DIV: __ divsd(xmm0, xmm1); break;
+ default: UNREACHABLE();
+ }
+ __ movsd(FieldOperand(rbx, HeapNumber::kValueOffset), xmm0);
+ __ movq(rax, rbx);
+ GenerateReturn(masm);
+ }
+ default:
+ break;
+ }
+
+ // 6. Non-smi operands, fall out to the non-smi code with the operands in
+ // rdx and rax.
+ Comment done_comment(masm, "-- Enter non-smi code");
+ __ bind(¬_smis);
+
+ switch (op_) {
+ case Token::DIV:
+ case Token::MOD:
+ // Operands are in rax, rbx at this point.
+ __ movq(rdx, rax);
+ __ movq(rax, rbx);
+ break;
+
+ case Token::BIT_OR:
+ // Right operand is saved in rcx and rax was destroyed by the smi
+ // operation.
+ __ movq(rax, rcx);
+ break;
+
+ default:
+ break;
+ }
+}
+
+
+void GenericBinaryOpStub::Generate(MacroAssembler* masm) {
+ Label call_runtime;
+
+ if (ShouldGenerateSmiCode()) {
+ GenerateSmiCode(masm, &call_runtime);
+ } else if (op_ != Token::MOD) {
+ if (!HasArgsInRegisters()) {
+ GenerateLoadArguments(masm);
+ }
+ }
+ // Floating point case.
+ if (ShouldGenerateFPCode()) {
+ switch (op_) {
+ case Token::ADD:
+ case Token::SUB:
+ case Token::MUL:
+ case Token::DIV: {
+ if (runtime_operands_type_ == BinaryOpIC::DEFAULT &&
+ HasSmiCodeInStub()) {
+ // Execution reaches this point when the first non-smi argument occurs
+ // (and only if smi code is generated). This is the right moment to
+ // patch to HEAP_NUMBERS state. The transition is attempted only for
+ // the four basic operations. The stub stays in the DEFAULT state
+ // forever for all other operations (also if smi code is skipped).
+ GenerateTypeTransition(masm);
+ break;
+ }
+
+ Label not_floats;
+ // rax: y
+ // rdx: x
+ if (static_operands_type_.IsNumber()) {
+ if (FLAG_debug_code) {
+ // Assert at runtime that inputs are only numbers.
+ __ AbortIfNotNumber(rdx);
+ __ AbortIfNotNumber(rax);
+ }
+ FloatingPointHelper::LoadSSE2NumberOperands(masm);
+ } else {
+ FloatingPointHelper::LoadSSE2UnknownOperands(masm, &call_runtime);
+ }
+
+ switch (op_) {
+ case Token::ADD: __ addsd(xmm0, xmm1); break;
+ case Token::SUB: __ subsd(xmm0, xmm1); break;
+ case Token::MUL: __ mulsd(xmm0, xmm1); break;
+ case Token::DIV: __ divsd(xmm0, xmm1); break;
+ default: UNREACHABLE();
+ }
+ // Allocate a heap number, if needed.
+ Label skip_allocation;
+ OverwriteMode mode = mode_;
+ if (HasArgsReversed()) {
+ if (mode == OVERWRITE_RIGHT) {
+ mode = OVERWRITE_LEFT;
+ } else if (mode == OVERWRITE_LEFT) {
+ mode = OVERWRITE_RIGHT;
+ }
+ }
+ switch (mode) {
+ case OVERWRITE_LEFT:
+ __ JumpIfNotSmi(rdx, &skip_allocation);
+ __ AllocateHeapNumber(rbx, rcx, &call_runtime);
+ __ movq(rdx, rbx);
+ __ bind(&skip_allocation);
+ __ movq(rax, rdx);
+ break;
+ case OVERWRITE_RIGHT:
+ // If the argument in rax is already an object, we skip the
+ // allocation of a heap number.
+ __ JumpIfNotSmi(rax, &skip_allocation);
+ // Fall through!
+ case NO_OVERWRITE:
+ // Allocate a heap number for the result. Keep rax and rdx intact
+ // for the possible runtime call.
+ __ AllocateHeapNumber(rbx, rcx, &call_runtime);
+ __ movq(rax, rbx);
+ __ bind(&skip_allocation);
+ break;
+ default: UNREACHABLE();
+ }
+ __ movsd(FieldOperand(rax, HeapNumber::kValueOffset), xmm0);
+ GenerateReturn(masm);
+ __ bind(¬_floats);
+ if (runtime_operands_type_ == BinaryOpIC::DEFAULT &&
+ !HasSmiCodeInStub()) {
+ // Execution reaches this point when the first non-number argument
+ // occurs (and only if smi code is skipped from the stub, otherwise
+ // the patching has already been done earlier in this case branch).
+ // A perfect moment to try patching to STRINGS for ADD operation.
+ if (op_ == Token::ADD) {
+ GenerateTypeTransition(masm);
+ }
+ }
+ break;
+ }
+ case Token::MOD: {
+ // For MOD we go directly to runtime in the non-smi case.
+ break;
+ }
+ case Token::BIT_OR:
+ case Token::BIT_AND:
+ case Token::BIT_XOR:
+ case Token::SAR:
+ case Token::SHL:
+ case Token::SHR: {
+ Label skip_allocation, non_smi_shr_result;
+ Register heap_number_map = r9;
+ __ LoadRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
+ if (static_operands_type_.IsNumber()) {
+ if (FLAG_debug_code) {
+ // Assert at runtime that inputs are only numbers.
+ __ AbortIfNotNumber(rdx);
+ __ AbortIfNotNumber(rax);
+ }
+ FloatingPointHelper::LoadNumbersAsIntegers(masm);
+ } else {
+ FloatingPointHelper::LoadAsIntegers(masm,
+ &call_runtime,
+ heap_number_map);
+ }
+ switch (op_) {
+ case Token::BIT_OR: __ orl(rax, rcx); break;
+ case Token::BIT_AND: __ andl(rax, rcx); break;
+ case Token::BIT_XOR: __ xorl(rax, rcx); break;
+ case Token::SAR: __ sarl_cl(rax); break;
+ case Token::SHL: __ shll_cl(rax); break;
+ case Token::SHR: {
+ __ shrl_cl(rax);
+ // Check if result is negative. This can only happen for a shift
+ // by zero.
+ __ testl(rax, rax);
+ __ j(negative, &non_smi_shr_result);
+ break;
+ }
+ default: UNREACHABLE();
+ }
+
+ STATIC_ASSERT(kSmiValueSize == 32);
+ // Tag smi result and return.
+ __ Integer32ToSmi(rax, rax);
+ GenerateReturn(masm);
+
+ // All bit-ops except SHR return a signed int32 that can be
+ // returned immediately as a smi.
+ // We might need to allocate a HeapNumber if we shift a negative
+ // number right by zero (i.e., convert to UInt32).
+ if (op_ == Token::SHR) {
+ ASSERT(non_smi_shr_result.is_linked());
+ __ bind(&non_smi_shr_result);
+ // Allocate a heap number if needed.
+ __ movl(rbx, rax); // rbx holds result value (uint32 value as int64).
+ switch (mode_) {
+ case OVERWRITE_LEFT:
+ case OVERWRITE_RIGHT:
+ // If the operand was an object, we skip the
+ // allocation of a heap number.
+ __ movq(rax, Operand(rsp, mode_ == OVERWRITE_RIGHT ?
+ 1 * kPointerSize : 2 * kPointerSize));
+ __ JumpIfNotSmi(rax, &skip_allocation);
+ // Fall through!
+ case NO_OVERWRITE:
+ // Allocate heap number in new space.
+ // Not using AllocateHeapNumber macro in order to reuse
+ // already loaded heap_number_map.
+ __ AllocateInNewSpace(HeapNumber::kSize,
+ rax,
+ rcx,
+ no_reg,
+ &call_runtime,
+ TAG_OBJECT);
+ // Set the map.
+ if (FLAG_debug_code) {
+ __ AbortIfNotRootValue(heap_number_map,
+ Heap::kHeapNumberMapRootIndex,
+ "HeapNumberMap register clobbered.");
+ }
+ __ movq(FieldOperand(rax, HeapObject::kMapOffset),
+ heap_number_map);
+ __ bind(&skip_allocation);
+ break;
+ default: UNREACHABLE();
+ }
+ // Store the result in the HeapNumber and return.
+ __ cvtqsi2sd(xmm0, rbx);
+ __ movsd(FieldOperand(rax, HeapNumber::kValueOffset), xmm0);
+ GenerateReturn(masm);
+ }
+
+ break;
+ }
+ default: UNREACHABLE(); break;
+ }
+ }
+
+ // If all else fails, use the runtime system to get the correct
+ // result. If arguments was passed in registers now place them on the
+ // stack in the correct order below the return address.
+ __ bind(&call_runtime);
+
+ if (HasArgsInRegisters()) {
+ GenerateRegisterArgsPush(masm);
+ }
+
+ switch (op_) {
+ case Token::ADD: {
+ // Registers containing left and right operands respectively.
+ Register lhs, rhs;
+
+ if (HasArgsReversed()) {
+ lhs = rax;
+ rhs = rdx;
+ } else {
+ lhs = rdx;
+ rhs = rax;
+ }
+
+ // Test for string arguments before calling runtime.
+ Label not_strings, both_strings, not_string1, string1, string1_smi2;
+
+ // If this stub has already generated FP-specific code then the arguments
+ // are already in rdx and rax.
+ if (!ShouldGenerateFPCode() && !HasArgsInRegisters()) {
+ GenerateLoadArguments(masm);
+ }
+
+ Condition is_smi;
+ is_smi = masm->CheckSmi(lhs);
+ __ j(is_smi, ¬_string1);
+ __ CmpObjectType(lhs, FIRST_NONSTRING_TYPE, r8);
+ __ j(above_equal, ¬_string1);
+
+ // First argument is a a string, test second.
+ is_smi = masm->CheckSmi(rhs);
+ __ j(is_smi, &string1_smi2);
+ __ CmpObjectType(rhs, FIRST_NONSTRING_TYPE, r9);
+ __ j(above_equal, &string1);
+
+ // First and second argument are strings.
+ StringAddStub string_add_stub(NO_STRING_CHECK_IN_STUB);
+ __ TailCallStub(&string_add_stub);
+
+ __ bind(&string1_smi2);
+ // First argument is a string, second is a smi. Try to lookup the number
+ // string for the smi in the number string cache.
+ NumberToStringStub::GenerateLookupNumberStringCache(
+ masm, rhs, rbx, rcx, r8, true, &string1);
+
+ // Replace second argument on stack and tailcall string add stub to make
+ // the result.
+ __ movq(Operand(rsp, 1 * kPointerSize), rbx);
+ __ TailCallStub(&string_add_stub);
+
+ // Only first argument is a string.
+ __ bind(&string1);
+ __ InvokeBuiltin(Builtins::STRING_ADD_LEFT, JUMP_FUNCTION);
+
+ // First argument was not a string, test second.
+ __ bind(¬_string1);
+ is_smi = masm->CheckSmi(rhs);
+ __ j(is_smi, ¬_strings);
+ __ CmpObjectType(rhs, FIRST_NONSTRING_TYPE, rhs);
+ __ j(above_equal, ¬_strings);
+
+ // Only second argument is a string.
+ __ InvokeBuiltin(Builtins::STRING_ADD_RIGHT, JUMP_FUNCTION);
+
+ __ bind(¬_strings);
+ // Neither argument is a string.
+ __ InvokeBuiltin(Builtins::ADD, JUMP_FUNCTION);
+ break;
+ }
+ case Token::SUB:
+ __ InvokeBuiltin(Builtins::SUB, JUMP_FUNCTION);
+ break;
+ case Token::MUL:
+ __ InvokeBuiltin(Builtins::MUL, JUMP_FUNCTION);
+ break;
+ case Token::DIV:
+ __ InvokeBuiltin(Builtins::DIV, JUMP_FUNCTION);
+ break;
+ case Token::MOD:
+ __ InvokeBuiltin(Builtins::MOD, JUMP_FUNCTION);
+ break;
+ case Token::BIT_OR:
+ __ InvokeBuiltin(Builtins::BIT_OR, JUMP_FUNCTION);
+ break;
+ case Token::BIT_AND:
+ __ InvokeBuiltin(Builtins::BIT_AND, JUMP_FUNCTION);
+ break;
+ case Token::BIT_XOR:
+ __ InvokeBuiltin(Builtins::BIT_XOR, JUMP_FUNCTION);
+ break;
+ case Token::SAR:
+ __ InvokeBuiltin(Builtins::SAR, JUMP_FUNCTION);
+ break;
+ case Token::SHL:
+ __ InvokeBuiltin(Builtins::SHL, JUMP_FUNCTION);
+ break;
+ case Token::SHR:
+ __ InvokeBuiltin(Builtins::SHR, JUMP_FUNCTION);
+ break;
+ default:
+ UNREACHABLE();
+ }
+}
+
+
+void GenericBinaryOpStub::GenerateLoadArguments(MacroAssembler* masm) {
+ ASSERT(!HasArgsInRegisters());
+ __ movq(rax, Operand(rsp, 1 * kPointerSize));
+ __ movq(rdx, Operand(rsp, 2 * kPointerSize));
+}
+
+
+void GenericBinaryOpStub::GenerateReturn(MacroAssembler* masm) {
+ // If arguments are not passed in registers remove them from the stack before
+ // returning.
+ if (!HasArgsInRegisters()) {
+ __ ret(2 * kPointerSize); // Remove both operands
+ } else {
+ __ ret(0);
+ }
+}
+
+
+void GenericBinaryOpStub::GenerateRegisterArgsPush(MacroAssembler* masm) {
+ ASSERT(HasArgsInRegisters());
+ __ pop(rcx);
+ if (HasArgsReversed()) {
+ __ push(rax);
+ __ push(rdx);
+ } else {
+ __ push(rdx);
+ __ push(rax);
+ }
+ __ push(rcx);
+}
+
+
+void GenericBinaryOpStub::GenerateTypeTransition(MacroAssembler* masm) {
+ Label get_result;
+
+ // Ensure the operands are on the stack.
+ if (HasArgsInRegisters()) {
+ GenerateRegisterArgsPush(masm);
+ }
+
+ // Left and right arguments are already on stack.
+ __ pop(rcx); // Save the return address.
+
+ // Push this stub's key.
+ __ Push(Smi::FromInt(MinorKey()));
+
+ // Although the operation and the type info are encoded into the key,
+ // the encoding is opaque, so push them too.
+ __ Push(Smi::FromInt(op_));
+
+ __ Push(Smi::FromInt(runtime_operands_type_));
+
+ __ push(rcx); // The return address.
+
+ // Perform patching to an appropriate fast case and return the result.
+ __ TailCallExternalReference(
+ ExternalReference(IC_Utility(IC::kBinaryOp_Patch)),
+ 5,
+ 1);
+}
+
+
+Handle<Code> GetBinaryOpStub(int key, BinaryOpIC::TypeInfo type_info) {
+ GenericBinaryOpStub stub(key, type_info);
+ return stub.GetCode();
+}
+
+
+void TranscendentalCacheStub::Generate(MacroAssembler* masm) {
+ // Input on stack:
+ // rsp[8]: argument (should be number).
+ // rsp[0]: return address.
+ Label runtime_call;
+ Label runtime_call_clear_stack;
+ Label input_not_smi;
+ Label loaded;
+ // Test that rax is a number.
+ __ movq(rax, Operand(rsp, kPointerSize));
+ __ JumpIfNotSmi(rax, &input_not_smi);
+ // Input is a smi. Untag and load it onto the FPU stack.
+ // Then load the bits of the double into rbx.
+ __ SmiToInteger32(rax, rax);
+ __ subq(rsp, Immediate(kPointerSize));
+ __ cvtlsi2sd(xmm1, rax);
+ __ movsd(Operand(rsp, 0), xmm1);
+ __ movq(rbx, xmm1);
+ __ movq(rdx, xmm1);
+ __ fld_d(Operand(rsp, 0));
+ __ addq(rsp, Immediate(kPointerSize));
+ __ jmp(&loaded);
+
+ __ bind(&input_not_smi);
+ // Check if input is a HeapNumber.
+ __ Move(rbx, Factory::heap_number_map());
+ __ cmpq(rbx, FieldOperand(rax, HeapObject::kMapOffset));
+ __ j(not_equal, &runtime_call);
+ // Input is a HeapNumber. Push it on the FPU stack and load its
+ // bits into rbx.
+ __ fld_d(FieldOperand(rax, HeapNumber::kValueOffset));
+ __ movq(rbx, FieldOperand(rax, HeapNumber::kValueOffset));
+ __ movq(rdx, rbx);
+ __ bind(&loaded);
+ // ST[0] == double value
+ // rbx = bits of double value.
+ // rdx = also bits of double value.
+ // Compute hash (h is 32 bits, bits are 64 and the shifts are arithmetic):
+ // h = h0 = bits ^ (bits >> 32);
+ // h ^= h >> 16;
+ // h ^= h >> 8;
+ // h = h & (cacheSize - 1);
+ // or h = (h0 ^ (h0 >> 8) ^ (h0 >> 16) ^ (h0 >> 24)) & (cacheSize - 1)
+ __ sar(rdx, Immediate(32));
+ __ xorl(rdx, rbx);
+ __ movl(rcx, rdx);
+ __ movl(rax, rdx);
+ __ movl(rdi, rdx);
+ __ sarl(rdx, Immediate(8));
+ __ sarl(rcx, Immediate(16));
+ __ sarl(rax, Immediate(24));
+ __ xorl(rcx, rdx);
+ __ xorl(rax, rdi);
+ __ xorl(rcx, rax);
+ ASSERT(IsPowerOf2(TranscendentalCache::kCacheSize));
+ __ andl(rcx, Immediate(TranscendentalCache::kCacheSize - 1));
+
+ // ST[0] == double value.
+ // rbx = bits of double value.
+ // rcx = TranscendentalCache::hash(double value).
+ __ movq(rax, ExternalReference::transcendental_cache_array_address());
+ // rax points to cache array.
+ __ movq(rax, Operand(rax, type_ * sizeof(TranscendentalCache::caches_[0])));
+ // rax points to the cache for the type type_.
+ // If NULL, the cache hasn't been initialized yet, so go through runtime.
+ __ testq(rax, rax);
+ __ j(zero, &runtime_call_clear_stack);
+#ifdef DEBUG
+ // Check that the layout of cache elements match expectations.
+ { // NOLINT - doesn't like a single brace on a line.
+ TranscendentalCache::Element test_elem[2];
+ char* elem_start = reinterpret_cast<char*>(&test_elem[0]);
+ char* elem2_start = reinterpret_cast<char*>(&test_elem[1]);
+ char* elem_in0 = reinterpret_cast<char*>(&(test_elem[0].in[0]));
+ char* elem_in1 = reinterpret_cast<char*>(&(test_elem[0].in[1]));
+ char* elem_out = reinterpret_cast<char*>(&(test_elem[0].output));
+ // Two uint_32's and a pointer per element.
+ CHECK_EQ(16, static_cast<int>(elem2_start - elem_start));
+ CHECK_EQ(0, static_cast<int>(elem_in0 - elem_start));
+ CHECK_EQ(kIntSize, static_cast<int>(elem_in1 - elem_start));
+ CHECK_EQ(2 * kIntSize, static_cast<int>(elem_out - elem_start));
+ }
+#endif
+ // Find the address of the rcx'th entry in the cache, i.e., &rax[rcx*16].
+ __ addl(rcx, rcx);
+ __ lea(rcx, Operand(rax, rcx, times_8, 0));
+ // Check if cache matches: Double value is stored in uint32_t[2] array.
+ Label cache_miss;
+ __ cmpq(rbx, Operand(rcx, 0));
+ __ j(not_equal, &cache_miss);
+ // Cache hit!
+ __ movq(rax, Operand(rcx, 2 * kIntSize));
+ __ fstp(0); // Clear FPU stack.
+ __ ret(kPointerSize);
+
+ __ bind(&cache_miss);
+ // Update cache with new value.
+ Label nan_result;
+ GenerateOperation(masm, &nan_result);
+ __ AllocateHeapNumber(rax, rdi, &runtime_call_clear_stack);
+ __ movq(Operand(rcx, 0), rbx);
+ __ movq(Operand(rcx, 2 * kIntSize), rax);
+ __ fstp_d(FieldOperand(rax, HeapNumber::kValueOffset));
+ __ ret(kPointerSize);
+
+ __ bind(&runtime_call_clear_stack);
+ __ fstp(0);
+ __ bind(&runtime_call);
+ __ TailCallExternalReference(ExternalReference(RuntimeFunction()), 1, 1);
+
+ __ bind(&nan_result);
+ __ fstp(0); // Remove argument from FPU stack.
+ __ LoadRoot(rax, Heap::kNanValueRootIndex);
+ __ movq(Operand(rcx, 0), rbx);
+ __ movq(Operand(rcx, 2 * kIntSize), rax);
+ __ ret(kPointerSize);
+}
+
+
+Runtime::FunctionId TranscendentalCacheStub::RuntimeFunction() {
+ switch (type_) {
+ // Add more cases when necessary.
+ case TranscendentalCache::SIN: return Runtime::kMath_sin;
+ case TranscendentalCache::COS: return Runtime::kMath_cos;
+ default:
+ UNIMPLEMENTED();
+ return Runtime::kAbort;
+ }
+}
+
+
+void TranscendentalCacheStub::GenerateOperation(MacroAssembler* masm,
+ Label* on_nan_result) {
+ // Registers:
+ // rbx: Bits of input double. Must be preserved.
+ // rcx: Pointer to cache entry. Must be preserved.
+ // st(0): Input double
+ Label done;
+ ASSERT(type_ == TranscendentalCache::SIN ||
+ type_ == TranscendentalCache::COS);
+ // More transcendental types can be added later.
+
+ // Both fsin and fcos require arguments in the range +/-2^63 and
+ // return NaN for infinities and NaN. They can share all code except
+ // the actual fsin/fcos operation.
+ Label in_range;
+ // If argument is outside the range -2^63..2^63, fsin/cos doesn't
+ // work. We must reduce it to the appropriate range.
+ __ movq(rdi, rbx);
+ // Move exponent and sign bits to low bits.
+ __ shr(rdi, Immediate(HeapNumber::kMantissaBits));
+ // Remove sign bit.
+ __ andl(rdi, Immediate((1 << HeapNumber::kExponentBits) - 1));
+ int supported_exponent_limit = (63 + HeapNumber::kExponentBias);
+ __ cmpl(rdi, Immediate(supported_exponent_limit));
+ __ j(below, &in_range);
+ // Check for infinity and NaN. Both return NaN for sin.
+ __ cmpl(rdi, Immediate(0x7ff));
+ __ j(equal, on_nan_result);
+
+ // Use fpmod to restrict argument to the range +/-2*PI.
+ __ fldpi();
+ __ fadd(0);
+ __ fld(1);
+ // FPU Stack: input, 2*pi, input.
+ {
+ Label no_exceptions;
+ __ fwait();
+ __ fnstsw_ax();
+ // Clear if Illegal Operand or Zero Division exceptions are set.
+ __ testl(rax, Immediate(5)); // #IO and #ZD flags of FPU status word.
+ __ j(zero, &no_exceptions);
+ __ fnclex();
+ __ bind(&no_exceptions);
+ }
+
+ // Compute st(0) % st(1)
+ {
+ Label partial_remainder_loop;
+ __ bind(&partial_remainder_loop);
+ __ fprem1();
+ __ fwait();
+ __ fnstsw_ax();
+ __ testl(rax, Immediate(0x400)); // Check C2 bit of FPU status word.
+ // If C2 is set, computation only has partial result. Loop to
+ // continue computation.
+ __ j(not_zero, &partial_remainder_loop);
+ }
+ // FPU Stack: input, 2*pi, input % 2*pi
+ __ fstp(2);
+ // FPU Stack: input % 2*pi, 2*pi,
+ __ fstp(0);
+ // FPU Stack: input % 2*pi
+ __ bind(&in_range);
+ switch (type_) {
+ case TranscendentalCache::SIN:
+ __ fsin();
+ break;
+ case TranscendentalCache::COS:
+ __ fcos();
+ break;
+ default:
+ UNREACHABLE();
+ }
+ __ bind(&done);
+}
+
+
+// Get the integer part of a heap number.
+// Overwrites the contents of rdi, rbx and rcx. Result cannot be rdi or rbx.
+void IntegerConvert(MacroAssembler* masm,
+ Register result,
+ Register source) {
+ // Result may be rcx. If result and source are the same register, source will
+ // be overwritten.
+ ASSERT(!result.is(rdi) && !result.is(rbx));
+ // TODO(lrn): When type info reaches here, if value is a 32-bit integer, use
+ // cvttsd2si (32-bit version) directly.
+ Register double_exponent = rbx;
+ Register double_value = rdi;
+ Label done, exponent_63_plus;
+ // Get double and extract exponent.
+ __ movq(double_value, FieldOperand(source, HeapNumber::kValueOffset));
+ // Clear result preemptively, in case we need to return zero.
+ __ xorl(result, result);
+ __ movq(xmm0, double_value); // Save copy in xmm0 in case we need it there.
+ // Double to remove sign bit, shift exponent down to least significant bits.
+ // and subtract bias to get the unshifted, unbiased exponent.
+ __ lea(double_exponent, Operand(double_value, double_value, times_1, 0));
+ __ shr(double_exponent, Immediate(64 - HeapNumber::kExponentBits));
+ __ subl(double_exponent, Immediate(HeapNumber::kExponentBias));
+ // Check whether the exponent is too big for a 63 bit unsigned integer.
+ __ cmpl(double_exponent, Immediate(63));
+ __ j(above_equal, &exponent_63_plus);
+ // Handle exponent range 0..62.
+ __ cvttsd2siq(result, xmm0);
+ __ jmp(&done);
+
+ __ bind(&exponent_63_plus);
+ // Exponent negative or 63+.
+ __ cmpl(double_exponent, Immediate(83));
+ // If exponent negative or above 83, number contains no significant bits in
+ // the range 0..2^31, so result is zero, and rcx already holds zero.
+ __ j(above, &done);
+
+ // Exponent in rage 63..83.
+ // Mantissa * 2^exponent contains bits in the range 2^0..2^31, namely
+ // the least significant exponent-52 bits.
+
+ // Negate low bits of mantissa if value is negative.
+ __ addq(double_value, double_value); // Move sign bit to carry.
+ __ sbbl(result, result); // And convert carry to -1 in result register.
+ // if scratch2 is negative, do (scratch2-1)^-1, otherwise (scratch2-0)^0.
+ __ addl(double_value, result);
+ // Do xor in opposite directions depending on where we want the result
+ // (depending on whether result is rcx or not).
+
+ if (result.is(rcx)) {
+ __ xorl(double_value, result);
+ // Left shift mantissa by (exponent - mantissabits - 1) to save the
+ // bits that have positional values below 2^32 (the extra -1 comes from the
+ // doubling done above to move the sign bit into the carry flag).
+ __ leal(rcx, Operand(double_exponent, -HeapNumber::kMantissaBits - 1));
+ __ shll_cl(double_value);
+ __ movl(result, double_value);
+ } else {
+ // As the then-branch, but move double-value to result before shifting.
+ __ xorl(result, double_value);
+ __ leal(rcx, Operand(double_exponent, -HeapNumber::kMantissaBits - 1));
+ __ shll_cl(result);
+ }
+
+ __ bind(&done);
+}
+
+
+// Input: rdx, rax are the left and right objects of a bit op.
+// Output: rax, rcx are left and right integers for a bit op.
+void FloatingPointHelper::LoadNumbersAsIntegers(MacroAssembler* masm) {
+ // Check float operands.
+ Label done;
+ Label rax_is_smi;
+ Label rax_is_object;
+ Label rdx_is_object;
+
+ __ JumpIfNotSmi(rdx, &rdx_is_object);
+ __ SmiToInteger32(rdx, rdx);
+ __ JumpIfSmi(rax, &rax_is_smi);
+
+ __ bind(&rax_is_object);
+ IntegerConvert(masm, rcx, rax); // Uses rdi, rcx and rbx.
+ __ jmp(&done);
+
+ __ bind(&rdx_is_object);
+ IntegerConvert(masm, rdx, rdx); // Uses rdi, rcx and rbx.
+ __ JumpIfNotSmi(rax, &rax_is_object);
+ __ bind(&rax_is_smi);
+ __ SmiToInteger32(rcx, rax);
+
+ __ bind(&done);
+ __ movl(rax, rdx);
+}
+
+
+// Input: rdx, rax are the left and right objects of a bit op.
+// Output: rax, rcx are left and right integers for a bit op.
+void FloatingPointHelper::LoadAsIntegers(MacroAssembler* masm,
+ Label* conversion_failure,
+ Register heap_number_map) {
+ // Check float operands.
+ Label arg1_is_object, check_undefined_arg1;
+ Label arg2_is_object, check_undefined_arg2;
+ Label load_arg2, done;
+
+ __ JumpIfNotSmi(rdx, &arg1_is_object);
+ __ SmiToInteger32(rdx, rdx);
+ __ jmp(&load_arg2);
+
+ // If the argument is undefined it converts to zero (ECMA-262, section 9.5).
+ __ bind(&check_undefined_arg1);
+ __ CompareRoot(rdx, Heap::kUndefinedValueRootIndex);
+ __ j(not_equal, conversion_failure);
+ __ movl(rdx, Immediate(0));
+ __ jmp(&load_arg2);
+
+ __ bind(&arg1_is_object);
+ __ cmpq(FieldOperand(rdx, HeapObject::kMapOffset), heap_number_map);
+ __ j(not_equal, &check_undefined_arg1);
+ // Get the untagged integer version of the edx heap number in rcx.
+ IntegerConvert(masm, rdx, rdx);
+
+ // Here rdx has the untagged integer, rax has a Smi or a heap number.
+ __ bind(&load_arg2);
+ // Test if arg2 is a Smi.
+ __ JumpIfNotSmi(rax, &arg2_is_object);
+ __ SmiToInteger32(rax, rax);
+ __ movl(rcx, rax);
+ __ jmp(&done);
+
+ // If the argument is undefined it converts to zero (ECMA-262, section 9.5).
+ __ bind(&check_undefined_arg2);
+ __ CompareRoot(rax, Heap::kUndefinedValueRootIndex);
+ __ j(not_equal, conversion_failure);
+ __ movl(rcx, Immediate(0));
+ __ jmp(&done);
+
+ __ bind(&arg2_is_object);
+ __ cmpq(FieldOperand(rax, HeapObject::kMapOffset), heap_number_map);
+ __ j(not_equal, &check_undefined_arg2);
+ // Get the untagged integer version of the rax heap number in rcx.
+ IntegerConvert(masm, rcx, rax);
+ __ bind(&done);
+ __ movl(rax, rdx);
+}
+
+
+void FloatingPointHelper::LoadSSE2SmiOperands(MacroAssembler* masm) {
+ __ SmiToInteger32(kScratchRegister, rdx);
+ __ cvtlsi2sd(xmm0, kScratchRegister);
+ __ SmiToInteger32(kScratchRegister, rax);
+ __ cvtlsi2sd(xmm1, kScratchRegister);
+}
+
+
+void FloatingPointHelper::LoadSSE2NumberOperands(MacroAssembler* masm) {
+ Label load_smi_rdx, load_nonsmi_rax, load_smi_rax, done;
+ // Load operand in rdx into xmm0.
+ __ JumpIfSmi(rdx, &load_smi_rdx);
+ __ movsd(xmm0, FieldOperand(rdx, HeapNumber::kValueOffset));
+ // Load operand in rax into xmm1.
+ __ JumpIfSmi(rax, &load_smi_rax);
+ __ bind(&load_nonsmi_rax);
+ __ movsd(xmm1, FieldOperand(rax, HeapNumber::kValueOffset));
+ __ jmp(&done);
+
+ __ bind(&load_smi_rdx);
+ __ SmiToInteger32(kScratchRegister, rdx);
+ __ cvtlsi2sd(xmm0, kScratchRegister);
+ __ JumpIfNotSmi(rax, &load_nonsmi_rax);
+
+ __ bind(&load_smi_rax);
+ __ SmiToInteger32(kScratchRegister, rax);
+ __ cvtlsi2sd(xmm1, kScratchRegister);
+
+ __ bind(&done);
+}
+
+
+void FloatingPointHelper::LoadSSE2UnknownOperands(MacroAssembler* masm,
+ Label* not_numbers) {
+ Label load_smi_rdx, load_nonsmi_rax, load_smi_rax, load_float_rax, done;
+ // Load operand in rdx into xmm0, or branch to not_numbers.
+ __ LoadRoot(rcx, Heap::kHeapNumberMapRootIndex);
+ __ JumpIfSmi(rdx, &load_smi_rdx);
+ __ cmpq(FieldOperand(rdx, HeapObject::kMapOffset), rcx);
+ __ j(not_equal, not_numbers); // Argument in rdx is not a number.
+ __ movsd(xmm0, FieldOperand(rdx, HeapNumber::kValueOffset));
+ // Load operand in rax into xmm1, or branch to not_numbers.
+ __ JumpIfSmi(rax, &load_smi_rax);
+
+ __ bind(&load_nonsmi_rax);
+ __ cmpq(FieldOperand(rax, HeapObject::kMapOffset), rcx);
+ __ j(not_equal, not_numbers);
+ __ movsd(xmm1, FieldOperand(rax, HeapNumber::kValueOffset));
+ __ jmp(&done);
+
+ __ bind(&load_smi_rdx);
+ __ SmiToInteger32(kScratchRegister, rdx);
+ __ cvtlsi2sd(xmm0, kScratchRegister);
+ __ JumpIfNotSmi(rax, &load_nonsmi_rax);
+
+ __ bind(&load_smi_rax);
+ __ SmiToInteger32(kScratchRegister, rax);
+ __ cvtlsi2sd(xmm1, kScratchRegister);
+ __ bind(&done);
+}
+
+
+void GenericUnaryOpStub::Generate(MacroAssembler* masm) {
+ Label slow, done;
+
+ if (op_ == Token::SUB) {
+ // Check whether the value is a smi.
+ Label try_float;
+ __ JumpIfNotSmi(rax, &try_float);
+
+ if (negative_zero_ == kIgnoreNegativeZero) {
+ __ SmiCompare(rax, Smi::FromInt(0));
+ __ j(equal, &done);
+ }
+
+ // Enter runtime system if the value of the smi is zero
+ // to make sure that we switch between 0 and -0.
+ // Also enter it if the value of the smi is Smi::kMinValue.
+ __ SmiNeg(rax, rax, &done);
+
+ // Either zero or Smi::kMinValue, neither of which become a smi when
+ // negated.
+ if (negative_zero_ == kStrictNegativeZero) {
+ __ SmiCompare(rax, Smi::FromInt(0));
+ __ j(not_equal, &slow);
+ __ Move(rax, Factory::minus_zero_value());
+ __ jmp(&done);
+ } else {
+ __ jmp(&slow);
+ }
+
+ // Try floating point case.
+ __ bind(&try_float);
+ __ movq(rdx, FieldOperand(rax, HeapObject::kMapOffset));
+ __ CompareRoot(rdx, Heap::kHeapNumberMapRootIndex);
+ __ j(not_equal, &slow);
+ // Operand is a float, negate its value by flipping sign bit.
+ __ movq(rdx, FieldOperand(rax, HeapNumber::kValueOffset));
+ __ movq(kScratchRegister, Immediate(0x01));
+ __ shl(kScratchRegister, Immediate(63));
+ __ xor_(rdx, kScratchRegister); // Flip sign.
+ // rdx is value to store.
+ if (overwrite_ == UNARY_OVERWRITE) {
+ __ movq(FieldOperand(rax, HeapNumber::kValueOffset), rdx);
+ } else {
+ __ AllocateHeapNumber(rcx, rbx, &slow);
+ // rcx: allocated 'empty' number
+ __ movq(FieldOperand(rcx, HeapNumber::kValueOffset), rdx);
+ __ movq(rax, rcx);
+ }
+ } else if (op_ == Token::BIT_NOT) {
+ // Check if the operand is a heap number.
+ __ movq(rdx, FieldOperand(rax, HeapObject::kMapOffset));
+ __ CompareRoot(rdx, Heap::kHeapNumberMapRootIndex);
+ __ j(not_equal, &slow);
+
+ // Convert the heap number in rax to an untagged integer in rcx.
+ IntegerConvert(masm, rax, rax);
+
+ // Do the bitwise operation and smi tag the result.
+ __ notl(rax);
+ __ Integer32ToSmi(rax, rax);
+ }
+
+ // Return from the stub.
+ __ bind(&done);
+ __ StubReturn(1);
+
+ // Handle the slow case by jumping to the JavaScript builtin.
+ __ bind(&slow);
+ __ pop(rcx); // pop return address
+ __ push(rax);
+ __ push(rcx); // push return address
+ switch (op_) {
+ case Token::SUB:
+ __ InvokeBuiltin(Builtins::UNARY_MINUS, JUMP_FUNCTION);
+ break;
+ case Token::BIT_NOT:
+ __ InvokeBuiltin(Builtins::BIT_NOT, JUMP_FUNCTION);
+ break;
+ default:
+ UNREACHABLE();
+ }
+}
+
+
+void ArgumentsAccessStub::GenerateReadElement(MacroAssembler* masm) {
+ // The key is in rdx and the parameter count is in rax.
+
+ // The displacement is used for skipping the frame pointer on the
+ // stack. It is the offset of the last parameter (if any) relative
+ // to the frame pointer.
+ static const int kDisplacement = 1 * kPointerSize;
+
+ // Check that the key is a smi.
+ Label slow;
+ __ JumpIfNotSmi(rdx, &slow);
+
+ // Check if the calling frame is an arguments adaptor frame.
+ Label adaptor;
+ __ movq(rbx, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
+ __ SmiCompare(Operand(rbx, StandardFrameConstants::kContextOffset),
+ Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
+ __ j(equal, &adaptor);
+
+ // Check index against formal parameters count limit passed in
+ // through register rax. Use unsigned comparison to get negative
+ // check for free.
+ __ cmpq(rdx, rax);
+ __ j(above_equal, &slow);
+
+ // Read the argument from the stack and return it.
+ SmiIndex index = masm->SmiToIndex(rax, rax, kPointerSizeLog2);
+ __ lea(rbx, Operand(rbp, index.reg, index.scale, 0));
+ index = masm->SmiToNegativeIndex(rdx, rdx, kPointerSizeLog2);
+ __ movq(rax, Operand(rbx, index.reg, index.scale, kDisplacement));
+ __ Ret();
+
+ // Arguments adaptor case: Check index against actual arguments
+ // limit found in the arguments adaptor frame. Use unsigned
+ // comparison to get negative check for free.
+ __ bind(&adaptor);
+ __ movq(rcx, Operand(rbx, ArgumentsAdaptorFrameConstants::kLengthOffset));
+ __ cmpq(rdx, rcx);
+ __ j(above_equal, &slow);
+
+ // Read the argument from the stack and return it.
+ index = masm->SmiToIndex(rax, rcx, kPointerSizeLog2);
+ __ lea(rbx, Operand(rbx, index.reg, index.scale, 0));
+ index = masm->SmiToNegativeIndex(rdx, rdx, kPointerSizeLog2);
+ __ movq(rax, Operand(rbx, index.reg, index.scale, kDisplacement));
+ __ Ret();
+
+ // Slow-case: Handle non-smi or out-of-bounds access to arguments
+ // by calling the runtime system.
+ __ bind(&slow);
+ __ pop(rbx); // Return address.
+ __ push(rdx);
+ __ push(rbx);
+ __ TailCallRuntime(Runtime::kGetArgumentsProperty, 1, 1);
+}
+
+
+void ArgumentsAccessStub::GenerateNewObject(MacroAssembler* masm) {
+ // rsp[0] : return address
+ // rsp[8] : number of parameters
+ // rsp[16] : receiver displacement
+ // rsp[24] : function
+
+ // The displacement is used for skipping the return address and the
+ // frame pointer on the stack. It is the offset of the last
+ // parameter (if any) relative to the frame pointer.
+ static const int kDisplacement = 2 * kPointerSize;
+
+ // Check if the calling frame is an arguments adaptor frame.
+ Label adaptor_frame, try_allocate, runtime;
+ __ movq(rdx, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
+ __ SmiCompare(Operand(rdx, StandardFrameConstants::kContextOffset),
+ Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
+ __ j(equal, &adaptor_frame);
+
+ // Get the length from the frame.
+ __ SmiToInteger32(rcx, Operand(rsp, 1 * kPointerSize));
+ __ jmp(&try_allocate);
+
+ // Patch the arguments.length and the parameters pointer.
+ __ bind(&adaptor_frame);
+ __ SmiToInteger32(rcx,
+ Operand(rdx,
+ ArgumentsAdaptorFrameConstants::kLengthOffset));
+ // Space on stack must already hold a smi.
+ __ Integer32ToSmiField(Operand(rsp, 1 * kPointerSize), rcx);
+ // Do not clobber the length index for the indexing operation since
+ // it is used compute the size for allocation later.
+ __ lea(rdx, Operand(rdx, rcx, times_pointer_size, kDisplacement));
+ __ movq(Operand(rsp, 2 * kPointerSize), rdx);
+
+ // Try the new space allocation. Start out with computing the size of
+ // the arguments object and the elements array.
+ Label add_arguments_object;
+ __ bind(&try_allocate);
+ __ testl(rcx, rcx);
+ __ j(zero, &add_arguments_object);
+ __ leal(rcx, Operand(rcx, times_pointer_size, FixedArray::kHeaderSize));
+ __ bind(&add_arguments_object);
+ __ addl(rcx, Immediate(Heap::kArgumentsObjectSize));
+
+ // Do the allocation of both objects in one go.
+ __ AllocateInNewSpace(rcx, rax, rdx, rbx, &runtime, TAG_OBJECT);
+
+ // Get the arguments boilerplate from the current (global) context.
+ int offset = Context::SlotOffset(Context::ARGUMENTS_BOILERPLATE_INDEX);
+ __ movq(rdi, Operand(rsi, Context::SlotOffset(Context::GLOBAL_INDEX)));
+ __ movq(rdi, FieldOperand(rdi, GlobalObject::kGlobalContextOffset));
+ __ movq(rdi, Operand(rdi, offset));
+
+ // Copy the JS object part.
+ STATIC_ASSERT(JSObject::kHeaderSize == 3 * kPointerSize);
+ __ movq(kScratchRegister, FieldOperand(rdi, 0 * kPointerSize));
+ __ movq(rdx, FieldOperand(rdi, 1 * kPointerSize));
+ __ movq(rbx, FieldOperand(rdi, 2 * kPointerSize));
+ __ movq(FieldOperand(rax, 0 * kPointerSize), kScratchRegister);
+ __ movq(FieldOperand(rax, 1 * kPointerSize), rdx);
+ __ movq(FieldOperand(rax, 2 * kPointerSize), rbx);
+
+ // Setup the callee in-object property.
+ ASSERT(Heap::arguments_callee_index == 0);
+ __ movq(kScratchRegister, Operand(rsp, 3 * kPointerSize));
+ __ movq(FieldOperand(rax, JSObject::kHeaderSize), kScratchRegister);
+
+ // Get the length (smi tagged) and set that as an in-object property too.
+ ASSERT(Heap::arguments_length_index == 1);
+ __ movq(rcx, Operand(rsp, 1 * kPointerSize));
+ __ movq(FieldOperand(rax, JSObject::kHeaderSize + kPointerSize), rcx);
+
+ // If there are no actual arguments, we're done.
+ Label done;
+ __ SmiTest(rcx);
+ __ j(zero, &done);
+
+ // Get the parameters pointer from the stack and untag the length.
+ __ movq(rdx, Operand(rsp, 2 * kPointerSize));
+
+ // Setup the elements pointer in the allocated arguments object and
+ // initialize the header in the elements fixed array.
+ __ lea(rdi, Operand(rax, Heap::kArgumentsObjectSize));
+ __ movq(FieldOperand(rax, JSObject::kElementsOffset), rdi);
+ __ LoadRoot(kScratchRegister, Heap::kFixedArrayMapRootIndex);
+ __ movq(FieldOperand(rdi, FixedArray::kMapOffset), kScratchRegister);
+ __ movq(FieldOperand(rdi, FixedArray::kLengthOffset), rcx);
+ __ SmiToInteger32(rcx, rcx); // Untag length for the loop below.
+
+ // Copy the fixed array slots.
+ Label loop;
+ __ bind(&loop);
+ __ movq(kScratchRegister, Operand(rdx, -1 * kPointerSize)); // Skip receiver.
+ __ movq(FieldOperand(rdi, FixedArray::kHeaderSize), kScratchRegister);
+ __ addq(rdi, Immediate(kPointerSize));
+ __ subq(rdx, Immediate(kPointerSize));
+ __ decl(rcx);
+ __ j(not_zero, &loop);
+
+ // Return and remove the on-stack parameters.
+ __ bind(&done);
+ __ ret(3 * kPointerSize);
+
+ // Do the runtime call to allocate the arguments object.
+ __ bind(&runtime);
+ __ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1);
+}
+
+
+void RegExpExecStub::Generate(MacroAssembler* masm) {
+ // Just jump directly to runtime if native RegExp is not selected at compile
+ // time or if regexp entry in generated code is turned off runtime switch or
+ // at compilation.
+#ifdef V8_INTERPRETED_REGEXP
+ __ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
+#else // V8_INTERPRETED_REGEXP
+ if (!FLAG_regexp_entry_native) {
+ __ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
+ return;
+ }
+
+ // Stack frame on entry.
+ // esp[0]: return address
+ // esp[8]: last_match_info (expected JSArray)
+ // esp[16]: previous index
+ // esp[24]: subject string
+ // esp[32]: JSRegExp object
+
+ static const int kLastMatchInfoOffset = 1 * kPointerSize;
+ static const int kPreviousIndexOffset = 2 * kPointerSize;
+ static const int kSubjectOffset = 3 * kPointerSize;
+ static const int kJSRegExpOffset = 4 * kPointerSize;
+
+ Label runtime;
+
+ // Ensure that a RegExp stack is allocated.
+ ExternalReference address_of_regexp_stack_memory_address =
+ ExternalReference::address_of_regexp_stack_memory_address();
+ ExternalReference address_of_regexp_stack_memory_size =
+ ExternalReference::address_of_regexp_stack_memory_size();
+ __ movq(kScratchRegister, address_of_regexp_stack_memory_size);
+ __ movq(kScratchRegister, Operand(kScratchRegister, 0));
+ __ testq(kScratchRegister, kScratchRegister);
+ __ j(zero, &runtime);
+
+
+ // Check that the first argument is a JSRegExp object.
+ __ movq(rax, Operand(rsp, kJSRegExpOffset));
+ __ JumpIfSmi(rax, &runtime);
+ __ CmpObjectType(rax, JS_REGEXP_TYPE, kScratchRegister);
+ __ j(not_equal, &runtime);
+ // Check that the RegExp has been compiled (data contains a fixed array).
+ __ movq(rcx, FieldOperand(rax, JSRegExp::kDataOffset));
+ if (FLAG_debug_code) {
+ Condition is_smi = masm->CheckSmi(rcx);
+ __ Check(NegateCondition(is_smi),
+ "Unexpected type for RegExp data, FixedArray expected");
+ __ CmpObjectType(rcx, FIXED_ARRAY_TYPE, kScratchRegister);
+ __ Check(equal, "Unexpected type for RegExp data, FixedArray expected");
+ }
+
+ // rcx: RegExp data (FixedArray)
+ // Check the type of the RegExp. Only continue if type is JSRegExp::IRREGEXP.
+ __ SmiToInteger32(rbx, FieldOperand(rcx, JSRegExp::kDataTagOffset));
+ __ cmpl(rbx, Immediate(JSRegExp::IRREGEXP));
+ __ j(not_equal, &runtime);
+
+ // rcx: RegExp data (FixedArray)
+ // Check that the number of captures fit in the static offsets vector buffer.
+ __ SmiToInteger32(rdx,
+ FieldOperand(rcx, JSRegExp::kIrregexpCaptureCountOffset));
+ // Calculate number of capture registers (number_of_captures + 1) * 2.
+ __ leal(rdx, Operand(rdx, rdx, times_1, 2));
+ // Check that the static offsets vector buffer is large enough.
+ __ cmpl(rdx, Immediate(OffsetsVector::kStaticOffsetsVectorSize));
+ __ j(above, &runtime);
+
+ // rcx: RegExp data (FixedArray)
+ // rdx: Number of capture registers
+ // Check that the second argument is a string.
+ __ movq(rax, Operand(rsp, kSubjectOffset));
+ __ JumpIfSmi(rax, &runtime);
+ Condition is_string = masm->IsObjectStringType(rax, rbx, rbx);
+ __ j(NegateCondition(is_string), &runtime);
+
+ // rax: Subject string.
+ // rcx: RegExp data (FixedArray).
+ // rdx: Number of capture registers.
+ // Check that the third argument is a positive smi less than the string
+ // length. A negative value will be greater (unsigned comparison).
+ __ movq(rbx, Operand(rsp, kPreviousIndexOffset));
+ __ JumpIfNotSmi(rbx, &runtime);
+ __ SmiCompare(rbx, FieldOperand(rax, String::kLengthOffset));
+ __ j(above_equal, &runtime);
+
+ // rcx: RegExp data (FixedArray)
+ // rdx: Number of capture registers
+ // Check that the fourth object is a JSArray object.
+ __ movq(rax, Operand(rsp, kLastMatchInfoOffset));
+ __ JumpIfSmi(rax, &runtime);
+ __ CmpObjectType(rax, JS_ARRAY_TYPE, kScratchRegister);
+ __ j(not_equal, &runtime);
+ // Check that the JSArray is in fast case.
+ __ movq(rbx, FieldOperand(rax, JSArray::kElementsOffset));
+ __ movq(rax, FieldOperand(rbx, HeapObject::kMapOffset));
+ __ Cmp(rax, Factory::fixed_array_map());
+ __ j(not_equal, &runtime);
+ // Check that the last match info has space for the capture registers and the
+ // additional information. Ensure no overflow in add.
+ STATIC_ASSERT(FixedArray::kMaxLength < kMaxInt - FixedArray::kLengthOffset);
+ __ SmiToInteger32(rax, FieldOperand(rbx, FixedArray::kLengthOffset));
+ __ addl(rdx, Immediate(RegExpImpl::kLastMatchOverhead));
+ __ cmpl(rdx, rax);
+ __ j(greater, &runtime);
+
+ // rcx: RegExp data (FixedArray)
+ // Check the representation and encoding of the subject string.
+ Label seq_ascii_string, seq_two_byte_string, check_code;
+ __ movq(rax, Operand(rsp, kSubjectOffset));
+ __ movq(rbx, FieldOperand(rax, HeapObject::kMapOffset));
+ __ movzxbl(rbx, FieldOperand(rbx, Map::kInstanceTypeOffset));
+ // First check for flat two byte string.
+ __ andb(rbx, Immediate(
+ kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask));
+ STATIC_ASSERT((kStringTag | kSeqStringTag | kTwoByteStringTag) == 0);
+ __ j(zero, &seq_two_byte_string);
+ // Any other flat string must be a flat ascii string.
+ __ testb(rbx, Immediate(kIsNotStringMask | kStringRepresentationMask));
+ __ j(zero, &seq_ascii_string);
+
+ // Check for flat cons string.
+ // A flat cons string is a cons string where the second part is the empty
+ // string. In that case the subject string is just the first part of the cons
+ // string. Also in this case the first part of the cons string is known to be
+ // a sequential string or an external string.
+ STATIC_ASSERT(kExternalStringTag !=0);
+ STATIC_ASSERT((kConsStringTag & kExternalStringTag) == 0);
+ __ testb(rbx, Immediate(kIsNotStringMask | kExternalStringTag));
+ __ j(not_zero, &runtime);
+ // String is a cons string.
+ __ movq(rdx, FieldOperand(rax, ConsString::kSecondOffset));
+ __ Cmp(rdx, Factory::empty_string());
+ __ j(not_equal, &runtime);
+ __ movq(rax, FieldOperand(rax, ConsString::kFirstOffset));
+ __ movq(rbx, FieldOperand(rax, HeapObject::kMapOffset));
+ // String is a cons string with empty second part.
+ // rax: first part of cons string.
+ // rbx: map of first part of cons string.
+ // Is first part a flat two byte string?
+ __ testb(FieldOperand(rbx, Map::kInstanceTypeOffset),
+ Immediate(kStringRepresentationMask | kStringEncodingMask));
+ STATIC_ASSERT((kSeqStringTag | kTwoByteStringTag) == 0);
+ __ j(zero, &seq_two_byte_string);
+ // Any other flat string must be ascii.
+ __ testb(FieldOperand(rbx, Map::kInstanceTypeOffset),
+ Immediate(kStringRepresentationMask));
+ __ j(not_zero, &runtime);
+
+ __ bind(&seq_ascii_string);
+ // rax: subject string (sequential ascii)
+ // rcx: RegExp data (FixedArray)
+ __ movq(r11, FieldOperand(rcx, JSRegExp::kDataAsciiCodeOffset));
+ __ Set(rdi, 1); // Type is ascii.
+ __ jmp(&check_code);
+
+ __ bind(&seq_two_byte_string);
+ // rax: subject string (flat two-byte)
+ // rcx: RegExp data (FixedArray)
+ __ movq(r11, FieldOperand(rcx, JSRegExp::kDataUC16CodeOffset));
+ __ Set(rdi, 0); // Type is two byte.
+
+ __ bind(&check_code);
+ // Check that the irregexp code has been generated for the actual string
+ // encoding. If it has, the field contains a code object otherwise it contains
+ // the hole.
+ __ CmpObjectType(r11, CODE_TYPE, kScratchRegister);
+ __ j(not_equal, &runtime);
+
+ // rax: subject string
+ // rdi: encoding of subject string (1 if ascii, 0 if two_byte);
+ // r11: code
+ // Load used arguments before starting to push arguments for call to native
+ // RegExp code to avoid handling changing stack height.
+ __ SmiToInteger64(rbx, Operand(rsp, kPreviousIndexOffset));
+
+ // rax: subject string
+ // rbx: previous index
+ // rdi: encoding of subject string (1 if ascii 0 if two_byte);
+ // r11: code
+ // All checks done. Now push arguments for native regexp code.
+ __ IncrementCounter(&Counters::regexp_entry_native, 1);
+
+ // rsi is caller save on Windows and used to pass parameter on Linux.
+ __ push(rsi);
+
+ static const int kRegExpExecuteArguments = 7;
+ __ PrepareCallCFunction(kRegExpExecuteArguments);
+ int argument_slots_on_stack =
+ masm->ArgumentStackSlotsForCFunctionCall(kRegExpExecuteArguments);
+
+ // Argument 7: Indicate that this is a direct call from JavaScript.
+ __ movq(Operand(rsp, (argument_slots_on_stack - 1) * kPointerSize),
+ Immediate(1));
+
+ // Argument 6: Start (high end) of backtracking stack memory area.
+ __ movq(kScratchRegister, address_of_regexp_stack_memory_address);
+ __ movq(r9, Operand(kScratchRegister, 0));
+ __ movq(kScratchRegister, address_of_regexp_stack_memory_size);
+ __ addq(r9, Operand(kScratchRegister, 0));
+ // Argument 6 passed in r9 on Linux and on the stack on Windows.
+#ifdef _WIN64
+ __ movq(Operand(rsp, (argument_slots_on_stack - 2) * kPointerSize), r9);
+#endif
+
+ // Argument 5: static offsets vector buffer.
+ __ movq(r8, ExternalReference::address_of_static_offsets_vector());
+ // Argument 5 passed in r8 on Linux and on the stack on Windows.
+#ifdef _WIN64
+ __ movq(Operand(rsp, (argument_slots_on_stack - 3) * kPointerSize), r8);
+#endif
+
+ // First four arguments are passed in registers on both Linux and Windows.
+#ifdef _WIN64
+ Register arg4 = r9;
+ Register arg3 = r8;
+ Register arg2 = rdx;
+ Register arg1 = rcx;
+#else
+ Register arg4 = rcx;
+ Register arg3 = rdx;
+ Register arg2 = rsi;
+ Register arg1 = rdi;
+#endif
+
+ // Keep track on aliasing between argX defined above and the registers used.
+ // rax: subject string
+ // rbx: previous index
+ // rdi: encoding of subject string (1 if ascii 0 if two_byte);
+ // r11: code
+
+ // Argument 4: End of string data
+ // Argument 3: Start of string data
+ Label setup_two_byte, setup_rest;
+ __ testb(rdi, rdi);
+ __ j(zero, &setup_two_byte);
+ __ SmiToInteger32(rdi, FieldOperand(rax, String::kLengthOffset));
+ __ lea(arg4, FieldOperand(rax, rdi, times_1, SeqAsciiString::kHeaderSize));
+ __ lea(arg3, FieldOperand(rax, rbx, times_1, SeqAsciiString::kHeaderSize));
+ __ jmp(&setup_rest);
+ __ bind(&setup_two_byte);
+ __ SmiToInteger32(rdi, FieldOperand(rax, String::kLengthOffset));
+ __ lea(arg4, FieldOperand(rax, rdi, times_2, SeqTwoByteString::kHeaderSize));
+ __ lea(arg3, FieldOperand(rax, rbx, times_2, SeqTwoByteString::kHeaderSize));
+
+ __ bind(&setup_rest);
+ // Argument 2: Previous index.
+ __ movq(arg2, rbx);
+
+ // Argument 1: Subject string.
+ __ movq(arg1, rax);
+
+ // Locate the code entry and call it.
+ __ addq(r11, Immediate(Code::kHeaderSize - kHeapObjectTag));
+ __ CallCFunction(r11, kRegExpExecuteArguments);
+
+ // rsi is caller save, as it is used to pass parameter.
+ __ pop(rsi);
+
+ // Check the result.
+ Label success;
+ __ cmpl(rax, Immediate(NativeRegExpMacroAssembler::SUCCESS));
+ __ j(equal, &success);
+ Label failure;
+ __ cmpl(rax, Immediate(NativeRegExpMacroAssembler::FAILURE));
+ __ j(equal, &failure);
+ __ cmpl(rax, Immediate(NativeRegExpMacroAssembler::EXCEPTION));
+ // If not exception it can only be retry. Handle that in the runtime system.
+ __ j(not_equal, &runtime);
+ // Result must now be exception. If there is no pending exception already a
+ // stack overflow (on the backtrack stack) was detected in RegExp code but
+ // haven't created the exception yet. Handle that in the runtime system.
+ // TODO(592): Rerunning the RegExp to get the stack overflow exception.
+ ExternalReference pending_exception_address(Top::k_pending_exception_address);
+ __ movq(kScratchRegister, pending_exception_address);
+ __ Cmp(kScratchRegister, Factory::the_hole_value());
+ __ j(equal, &runtime);
+ __ bind(&failure);
+ // For failure and exception return null.
+ __ Move(rax, Factory::null_value());
+ __ ret(4 * kPointerSize);
+
+ // Load RegExp data.
+ __ bind(&success);
+ __ movq(rax, Operand(rsp, kJSRegExpOffset));
+ __ movq(rcx, FieldOperand(rax, JSRegExp::kDataOffset));
+ __ SmiToInteger32(rax,
+ FieldOperand(rcx, JSRegExp::kIrregexpCaptureCountOffset));
+ // Calculate number of capture registers (number_of_captures + 1) * 2.
+ __ leal(rdx, Operand(rax, rax, times_1, 2));
+
+ // rdx: Number of capture registers
+ // Load last_match_info which is still known to be a fast case JSArray.
+ __ movq(rax, Operand(rsp, kLastMatchInfoOffset));
+ __ movq(rbx, FieldOperand(rax, JSArray::kElementsOffset));
+
+ // rbx: last_match_info backing store (FixedArray)
+ // rdx: number of capture registers
+ // Store the capture count.
+ __ Integer32ToSmi(kScratchRegister, rdx);
+ __ movq(FieldOperand(rbx, RegExpImpl::kLastCaptureCountOffset),
+ kScratchRegister);
+ // Store last subject and last input.
+ __ movq(rax, Operand(rsp, kSubjectOffset));
+ __ movq(FieldOperand(rbx, RegExpImpl::kLastSubjectOffset), rax);
+ __ movq(rcx, rbx);
+ __ RecordWrite(rcx, RegExpImpl::kLastSubjectOffset, rax, rdi);
+ __ movq(rax, Operand(rsp, kSubjectOffset));
+ __ movq(FieldOperand(rbx, RegExpImpl::kLastInputOffset), rax);
+ __ movq(rcx, rbx);
+ __ RecordWrite(rcx, RegExpImpl::kLastInputOffset, rax, rdi);
+
+ // Get the static offsets vector filled by the native regexp code.
+ __ movq(rcx, ExternalReference::address_of_static_offsets_vector());
+
+ // rbx: last_match_info backing store (FixedArray)
+ // rcx: offsets vector
+ // rdx: number of capture registers
+ Label next_capture, done;
+ // Capture register counter starts from number of capture registers and
+ // counts down until wraping after zero.
+ __ bind(&next_capture);
+ __ subq(rdx, Immediate(1));
+ __ j(negative, &done);
+ // Read the value from the static offsets vector buffer and make it a smi.
+ __ movl(rdi, Operand(rcx, rdx, times_int_size, 0));
+ __ Integer32ToSmi(rdi, rdi, &runtime);
+ // Store the smi value in the last match info.
+ __ movq(FieldOperand(rbx,
+ rdx,
+ times_pointer_size,
+ RegExpImpl::kFirstCaptureOffset),
+ rdi);
+ __ jmp(&next_capture);
+ __ bind(&done);
+
+ // Return last match info.
+ __ movq(rax, Operand(rsp, kLastMatchInfoOffset));
+ __ ret(4 * kPointerSize);
+
+ // Do the runtime call to execute the regexp.
+ __ bind(&runtime);
+ __ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
+#endif // V8_INTERPRETED_REGEXP
+}
+
+
+void NumberToStringStub::GenerateLookupNumberStringCache(MacroAssembler* masm,
+ Register object,
+ Register result,
+ Register scratch1,
+ Register scratch2,
+ bool object_is_smi,
+ Label* not_found) {
+ // Use of registers. Register result is used as a temporary.
+ Register number_string_cache = result;
+ Register mask = scratch1;
+ Register scratch = scratch2;
+
+ // Load the number string cache.
+ __ LoadRoot(number_string_cache, Heap::kNumberStringCacheRootIndex);
+
+ // Make the hash mask from the length of the number string cache. It
+ // contains two elements (number and string) for each cache entry.
+ __ SmiToInteger32(
+ mask, FieldOperand(number_string_cache, FixedArray::kLengthOffset));
+ __ shrl(mask, Immediate(1));
+ __ subq(mask, Immediate(1)); // Make mask.
+
+ // Calculate the entry in the number string cache. The hash value in the
+ // number string cache for smis is just the smi value, and the hash for
+ // doubles is the xor of the upper and lower words. See
+ // Heap::GetNumberStringCache.
+ Label is_smi;
+ Label load_result_from_cache;
+ if (!object_is_smi) {
+ __ JumpIfSmi(object, &is_smi);
+ __ CheckMap(object, Factory::heap_number_map(), not_found, true);
+
+ STATIC_ASSERT(8 == kDoubleSize);
+ __ movl(scratch, FieldOperand(object, HeapNumber::kValueOffset + 4));
+ __ xor_(scratch, FieldOperand(object, HeapNumber::kValueOffset));
+ GenerateConvertHashCodeToIndex(masm, scratch, mask);
+
+ Register index = scratch;
+ Register probe = mask;
+ __ movq(probe,
+ FieldOperand(number_string_cache,
+ index,
+ times_1,
+ FixedArray::kHeaderSize));
+ __ JumpIfSmi(probe, not_found);
+ ASSERT(CpuFeatures::IsSupported(SSE2));
+ CpuFeatures::Scope fscope(SSE2);
+ __ movsd(xmm0, FieldOperand(object, HeapNumber::kValueOffset));
+ __ movsd(xmm1, FieldOperand(probe, HeapNumber::kValueOffset));
+ __ ucomisd(xmm0, xmm1);
+ __ j(parity_even, not_found); // Bail out if NaN is involved.
+ __ j(not_equal, not_found); // The cache did not contain this value.
+ __ jmp(&load_result_from_cache);
+ }
+
+ __ bind(&is_smi);
+ __ SmiToInteger32(scratch, object);
+ GenerateConvertHashCodeToIndex(masm, scratch, mask);
+
+ Register index = scratch;
+ // Check if the entry is the smi we are looking for.
+ __ cmpq(object,
+ FieldOperand(number_string_cache,
+ index,
+ times_1,
+ FixedArray::kHeaderSize));
+ __ j(not_equal, not_found);
+
+ // Get the result from the cache.
+ __ bind(&load_result_from_cache);
+ __ movq(result,
+ FieldOperand(number_string_cache,
+ index,
+ times_1,
+ FixedArray::kHeaderSize + kPointerSize));
+ __ IncrementCounter(&Counters::number_to_string_native, 1);
+}
+
+
+void NumberToStringStub::GenerateConvertHashCodeToIndex(MacroAssembler* masm,
+ Register hash,
+ Register mask) {
+ __ and_(hash, mask);
+ // Each entry in string cache consists of two pointer sized fields,
+ // but times_twice_pointer_size (multiplication by 16) scale factor
+ // is not supported by addrmode on x64 platform.
+ // So we have to premultiply entry index before lookup.
+ __ shl(hash, Immediate(kPointerSizeLog2 + 1));
+}
+
+
+void NumberToStringStub::Generate(MacroAssembler* masm) {
+ Label runtime;
+
+ __ movq(rbx, Operand(rsp, kPointerSize));
+
+ // Generate code to lookup number in the number string cache.
+ GenerateLookupNumberStringCache(masm, rbx, rax, r8, r9, false, &runtime);
+ __ ret(1 * kPointerSize);
+
+ __ bind(&runtime);
+ // Handle number to string in the runtime system if not found in the cache.
+ __ TailCallRuntime(Runtime::kNumberToStringSkipCache, 1, 1);
+}
+
+
+static int NegativeComparisonResult(Condition cc) {
+ ASSERT(cc != equal);
+ ASSERT((cc == less) || (cc == less_equal)
+ || (cc == greater) || (cc == greater_equal));
+ return (cc == greater || cc == greater_equal) ? LESS : GREATER;
+}
+
+
+void CompareStub::Generate(MacroAssembler* masm) {
+ ASSERT(lhs_.is(no_reg) && rhs_.is(no_reg));
+
+ Label check_unequal_objects, done;
+ // The compare stub returns a positive, negative, or zero 64-bit integer
+ // value in rax, corresponding to result of comparing the two inputs.
+ // NOTICE! This code is only reached after a smi-fast-case check, so
+ // it is certain that at least one operand isn't a smi.
+
+ // Two identical objects are equal unless they are both NaN or undefined.
+ {
+ Label not_identical;
+ __ cmpq(rax, rdx);
+ __ j(not_equal, ¬_identical);
+
+ if (cc_ != equal) {
+ // Check for undefined. undefined OP undefined is false even though
+ // undefined == undefined.
+ Label check_for_nan;
+ __ CompareRoot(rdx, Heap::kUndefinedValueRootIndex);
+ __ j(not_equal, &check_for_nan);
+ __ Set(rax, NegativeComparisonResult(cc_));
+ __ ret(0);
+ __ bind(&check_for_nan);
+ }
+
+ // Test for NaN. Sadly, we can't just compare to Factory::nan_value(),
+ // so we do the second best thing - test it ourselves.
+ // Note: if cc_ != equal, never_nan_nan_ is not used.
+ // We cannot set rax to EQUAL until just before return because
+ // rax must be unchanged on jump to not_identical.
+
+ if (never_nan_nan_ && (cc_ == equal)) {
+ __ Set(rax, EQUAL);
+ __ ret(0);
+ } else {
+ Label heap_number;
+ // If it's not a heap number, then return equal for (in)equality operator.
+ __ Cmp(FieldOperand(rdx, HeapObject::kMapOffset),
+ Factory::heap_number_map());
+ __ j(equal, &heap_number);
+ if (cc_ != equal) {
+ // Call runtime on identical JSObjects. Otherwise return equal.
+ __ CmpObjectType(rax, FIRST_JS_OBJECT_TYPE, rcx);
+ __ j(above_equal, ¬_identical);
+ }
+ __ Set(rax, EQUAL);
+ __ ret(0);
+
+ __ bind(&heap_number);
+ // It is a heap number, so return equal if it's not NaN.
+ // For NaN, return 1 for every condition except greater and
+ // greater-equal. Return -1 for them, so the comparison yields
+ // false for all conditions except not-equal.
+ __ Set(rax, EQUAL);
+ __ movsd(xmm0, FieldOperand(rdx, HeapNumber::kValueOffset));
+ __ ucomisd(xmm0, xmm0);
+ __ setcc(parity_even, rax);
+ // rax is 0 for equal non-NaN heapnumbers, 1 for NaNs.
+ if (cc_ == greater_equal || cc_ == greater) {
+ __ neg(rax);
+ }
+ __ ret(0);
+ }
+
+ __ bind(¬_identical);
+ }
+
+ if (cc_ == equal) { // Both strict and non-strict.
+ Label slow; // Fallthrough label.
+
+ // If we're doing a strict equality comparison, we don't have to do
+ // type conversion, so we generate code to do fast comparison for objects
+ // and oddballs. Non-smi numbers and strings still go through the usual
+ // slow-case code.
+ if (strict_) {
+ // If either is a Smi (we know that not both are), then they can only
+ // be equal if the other is a HeapNumber. If so, use the slow case.
+ {
+ Label not_smis;
+ __ SelectNonSmi(rbx, rax, rdx, ¬_smis);
+
+ // Check if the non-smi operand is a heap number.
+ __ Cmp(FieldOperand(rbx, HeapObject::kMapOffset),
+ Factory::heap_number_map());
+ // If heap number, handle it in the slow case.
+ __ j(equal, &slow);
+ // Return non-equal. ebx (the lower half of rbx) is not zero.
+ __ movq(rax, rbx);
+ __ ret(0);
+
+ __ bind(¬_smis);
+ }
+
+ // If either operand is a JSObject or an oddball value, then they are not
+ // equal since their pointers are different
+ // There is no test for undetectability in strict equality.
+
+ // If the first object is a JS object, we have done pointer comparison.
+ STATIC_ASSERT(LAST_TYPE == JS_FUNCTION_TYPE);
+ Label first_non_object;
+ __ CmpObjectType(rax, FIRST_JS_OBJECT_TYPE, rcx);
+ __ j(below, &first_non_object);
+ // Return non-zero (eax (not rax) is not zero)
+ Label return_not_equal;
+ STATIC_ASSERT(kHeapObjectTag != 0);
+ __ bind(&return_not_equal);
+ __ ret(0);
+
+ __ bind(&first_non_object);
+ // Check for oddballs: true, false, null, undefined.
+ __ CmpInstanceType(rcx, ODDBALL_TYPE);
+ __ j(equal, &return_not_equal);
+
+ __ CmpObjectType(rdx, FIRST_JS_OBJECT_TYPE, rcx);
+ __ j(above_equal, &return_not_equal);
+
+ // Check for oddballs: true, false, null, undefined.
+ __ CmpInstanceType(rcx, ODDBALL_TYPE);
+ __ j(equal, &return_not_equal);
+
+ // Fall through to the general case.
+ }
+ __ bind(&slow);
+ }
+
+ // Generate the number comparison code.
+ if (include_number_compare_) {
+ Label non_number_comparison;
+ Label unordered;
+ FloatingPointHelper::LoadSSE2UnknownOperands(masm, &non_number_comparison);
+ __ xorl(rax, rax);
+ __ xorl(rcx, rcx);
+ __ ucomisd(xmm0, xmm1);
+
+ // Don't base result on EFLAGS when a NaN is involved.
+ __ j(parity_even, &unordered);
+ // Return a result of -1, 0, or 1, based on EFLAGS.
+ __ setcc(above, rax);
+ __ setcc(below, rcx);
+ __ subq(rax, rcx);
+ __ ret(0);
+
+ // If one of the numbers was NaN, then the result is always false.
+ // The cc is never not-equal.
+ __ bind(&unordered);
+ ASSERT(cc_ != not_equal);
+ if (cc_ == less || cc_ == less_equal) {
+ __ Set(rax, 1);
+ } else {
+ __ Set(rax, -1);
+ }
+ __ ret(0);
+
+ // The number comparison code did not provide a valid result.
+ __ bind(&non_number_comparison);
+ }
+
+ // Fast negative check for symbol-to-symbol equality.
+ Label check_for_strings;
+ if (cc_ == equal) {
+ BranchIfNonSymbol(masm, &check_for_strings, rax, kScratchRegister);
+ BranchIfNonSymbol(masm, &check_for_strings, rdx, kScratchRegister);
+
+ // We've already checked for object identity, so if both operands
+ // are symbols they aren't equal. Register eax (not rax) already holds a
+ // non-zero value, which indicates not equal, so just return.
+ __ ret(0);
+ }
+
+ __ bind(&check_for_strings);
+
+ __ JumpIfNotBothSequentialAsciiStrings(
+ rdx, rax, rcx, rbx, &check_unequal_objects);
+
+ // Inline comparison of ascii strings.
+ StringCompareStub::GenerateCompareFlatAsciiStrings(masm,
+ rdx,
+ rax,
+ rcx,
+ rbx,
+ rdi,
+ r8);
+
+#ifdef DEBUG
+ __ Abort("Unexpected fall-through from string comparison");
+#endif
+
+ __ bind(&check_unequal_objects);
+ if (cc_ == equal && !strict_) {
+ // Not strict equality. Objects are unequal if
+ // they are both JSObjects and not undetectable,
+ // and their pointers are different.
+ Label not_both_objects, return_unequal;
+ // At most one is a smi, so we can test for smi by adding the two.
+ // A smi plus a heap object has the low bit set, a heap object plus
+ // a heap object has the low bit clear.
+ STATIC_ASSERT(kSmiTag == 0);
+ STATIC_ASSERT(kSmiTagMask == 1);
+ __ lea(rcx, Operand(rax, rdx, times_1, 0));
+ __ testb(rcx, Immediate(kSmiTagMask));
+ __ j(not_zero, ¬_both_objects);
+ __ CmpObjectType(rax, FIRST_JS_OBJECT_TYPE, rbx);
+ __ j(below, ¬_both_objects);
+ __ CmpObjectType(rdx, FIRST_JS_OBJECT_TYPE, rcx);
+ __ j(below, ¬_both_objects);
+ __ testb(FieldOperand(rbx, Map::kBitFieldOffset),
+ Immediate(1 << Map::kIsUndetectable));
+ __ j(zero, &return_unequal);
+ __ testb(FieldOperand(rcx, Map::kBitFieldOffset),
+ Immediate(1 << Map::kIsUndetectable));
+ __ j(zero, &return_unequal);
+ // The objects are both undetectable, so they both compare as the value
+ // undefined, and are equal.
+ __ Set(rax, EQUAL);
+ __ bind(&return_unequal);
+ // Return non-equal by returning the non-zero object pointer in eax,
+ // or return equal if we fell through to here.
+ __ ret(0);
+ __ bind(¬_both_objects);
+ }
+
+ // Push arguments below the return address to prepare jump to builtin.
+ __ pop(rcx);
+ __ push(rdx);
+ __ push(rax);
+
+ // Figure out which native to call and setup the arguments.
+ Builtins::JavaScript builtin;
+ if (cc_ == equal) {
+ builtin = strict_ ? Builtins::STRICT_EQUALS : Builtins::EQUALS;
+ } else {
+ builtin = Builtins::COMPARE;
+ __ Push(Smi::FromInt(NegativeComparisonResult(cc_)));
+ }
+
+ // Restore return address on the stack.
+ __ push(rcx);
+
+ // Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
+ // tagged as a small integer.
+ __ InvokeBuiltin(builtin, JUMP_FUNCTION);
+}
+
+
+void CompareStub::BranchIfNonSymbol(MacroAssembler* masm,
+ Label* label,
+ Register object,
+ Register scratch) {
+ __ JumpIfSmi(object, label);
+ __ movq(scratch, FieldOperand(object, HeapObject::kMapOffset));
+ __ movzxbq(scratch,
+ FieldOperand(scratch, Map::kInstanceTypeOffset));
+ // Ensure that no non-strings have the symbol bit set.
+ STATIC_ASSERT(LAST_TYPE < kNotStringTag + kIsSymbolMask);
+ STATIC_ASSERT(kSymbolTag != 0);
+ __ testb(scratch, Immediate(kIsSymbolMask));
+ __ j(zero, label);
+}
+
+
+void StackCheckStub::Generate(MacroAssembler* masm) {
+ // Because builtins always remove the receiver from the stack, we
+ // have to fake one to avoid underflowing the stack. The receiver
+ // must be inserted below the return address on the stack so we
+ // temporarily store that in a register.
+ __ pop(rax);
+ __ Push(Smi::FromInt(0));
+ __ push(rax);
+
+ // Do tail-call to runtime routine.
+ __ TailCallRuntime(Runtime::kStackGuard, 1, 1);
+}
+
+
+void CallFunctionStub::Generate(MacroAssembler* masm) {
+ Label slow;
+
+ // If the receiver might be a value (string, number or boolean) check for this
+ // and box it if it is.
+ if (ReceiverMightBeValue()) {
+ // Get the receiver from the stack.
+ // +1 ~ return address
+ Label receiver_is_value, receiver_is_js_object;
+ __ movq(rax, Operand(rsp, (argc_ + 1) * kPointerSize));
+
+ // Check if receiver is a smi (which is a number value).
+ __ JumpIfSmi(rax, &receiver_is_value);
+
+ // Check if the receiver is a valid JS object.
+ __ CmpObjectType(rax, FIRST_JS_OBJECT_TYPE, rdi);
+ __ j(above_equal, &receiver_is_js_object);
+
+ // Call the runtime to box the value.
+ __ bind(&receiver_is_value);
+ __ EnterInternalFrame();
+ __ push(rax);
+ __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+ __ LeaveInternalFrame();
+ __ movq(Operand(rsp, (argc_ + 1) * kPointerSize), rax);
+
+ __ bind(&receiver_is_js_object);
+ }
+
+ // Get the function to call from the stack.
+ // +2 ~ receiver, return address
+ __ movq(rdi, Operand(rsp, (argc_ + 2) * kPointerSize));
+
+ // Check that the function really is a JavaScript function.
+ __ JumpIfSmi(rdi, &slow);
+ // Goto slow case if we do not have a function.
+ __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
+ __ j(not_equal, &slow);
+
+ // Fast-case: Just invoke the function.
+ ParameterCount actual(argc_);
+ __ InvokeFunction(rdi, actual, JUMP_FUNCTION);
+
+ // Slow-case: Non-function called.
+ __ bind(&slow);
+ // CALL_NON_FUNCTION expects the non-function callee as receiver (instead
+ // of the original receiver from the call site).
+ __ movq(Operand(rsp, (argc_ + 1) * kPointerSize), rdi);
+ __ Set(rax, argc_);
+ __ Set(rbx, 0);
+ __ GetBuiltinEntry(rdx, Builtins::CALL_NON_FUNCTION);
+ Handle<Code> adaptor(Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline));
+ __ Jump(adaptor, RelocInfo::CODE_TARGET);
+}
+
+
+void CEntryStub::GenerateThrowTOS(MacroAssembler* masm) {
+ // Check that stack should contain next handler, frame pointer, state and
+ // return address in that order.
+ STATIC_ASSERT(StackHandlerConstants::kFPOffset + kPointerSize ==
+ StackHandlerConstants::kStateOffset);
+ STATIC_ASSERT(StackHandlerConstants::kStateOffset + kPointerSize ==
+ StackHandlerConstants::kPCOffset);
+
+ ExternalReference handler_address(Top::k_handler_address);
+ __ movq(kScratchRegister, handler_address);
+ __ movq(rsp, Operand(kScratchRegister, 0));
+ // get next in chain
+ __ pop(rcx);
+ __ movq(Operand(kScratchRegister, 0), rcx);
+ __ pop(rbp); // pop frame pointer
+ __ pop(rdx); // remove state
+
+ // Before returning we restore the context from the frame pointer if not NULL.
+ // The frame pointer is NULL in the exception handler of a JS entry frame.
+ __ xor_(rsi, rsi); // tentatively set context pointer to NULL
+ Label skip;
+ __ cmpq(rbp, Immediate(0));
+ __ j(equal, &skip);
+ __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
+ __ bind(&skip);
+ __ ret(0);
+}
+
+
+void ApiGetterEntryStub::Generate(MacroAssembler* masm) {
+ Label empty_result;
+ Label prologue;
+ Label promote_scheduled_exception;
+ __ EnterApiExitFrame(kStackSpace, 0);
+ ASSERT_EQ(kArgc, 4);
+#ifdef _WIN64
+ // All the parameters should be set up by a caller.
+#else
+ // Set 1st parameter register with property name.
+ __ movq(rsi, rdx);
+ // Second parameter register rdi should be set with pointer to AccessorInfo
+ // by a caller.
+#endif
+ // Call the api function!
+ __ movq(rax,
+ reinterpret_cast<int64_t>(fun()->address()),
+ RelocInfo::RUNTIME_ENTRY);
+ __ call(rax);
+ // Check if the function scheduled an exception.
+ ExternalReference scheduled_exception_address =
+ ExternalReference::scheduled_exception_address();
+ __ movq(rsi, scheduled_exception_address);
+ __ Cmp(Operand(rsi, 0), Factory::the_hole_value());
+ __ j(not_equal, &promote_scheduled_exception);
+#ifdef _WIN64
+ // rax keeps a pointer to v8::Handle, unpack it.
+ __ movq(rax, Operand(rax, 0));
+#endif
+ // Check if the result handle holds 0.
+ __ testq(rax, rax);
+ __ j(zero, &empty_result);
+ // It was non-zero. Dereference to get the result value.
+ __ movq(rax, Operand(rax, 0));
+ __ bind(&prologue);
+ __ LeaveExitFrame();
+ __ ret(0);
+ __ bind(&promote_scheduled_exception);
+ __ TailCallRuntime(Runtime::kPromoteScheduledException, 0, 1);
+ __ bind(&empty_result);
+ // It was zero; the result is undefined.
+ __ Move(rax, Factory::undefined_value());
+ __ jmp(&prologue);
+}
+
+
+void CEntryStub::GenerateCore(MacroAssembler* masm,
+ Label* throw_normal_exception,
+ Label* throw_termination_exception,
+ Label* throw_out_of_memory_exception,
+ bool do_gc,
+ bool always_allocate_scope,
+ int /* alignment_skew */) {
+ // rax: result parameter for PerformGC, if any.
+ // rbx: pointer to C function (C callee-saved).
+ // rbp: frame pointer (restored after C call).
+ // rsp: stack pointer (restored after C call).
+ // r14: number of arguments including receiver (C callee-saved).
+ // r12: pointer to the first argument (C callee-saved).
+ // This pointer is reused in LeaveExitFrame(), so it is stored in a
+ // callee-saved register.
+
+ // Simple results returned in rax (both AMD64 and Win64 calling conventions).
+ // Complex results must be written to address passed as first argument.
+ // AMD64 calling convention: a struct of two pointers in rax+rdx
+
+ // Check stack alignment.
+ if (FLAG_debug_code) {
+ __ CheckStackAlignment();
+ }
+
+ if (do_gc) {
+ // Pass failure code returned from last attempt as first argument to
+ // PerformGC. No need to use PrepareCallCFunction/CallCFunction here as the
+ // stack is known to be aligned. This function takes one argument which is
+ // passed in register.
+#ifdef _WIN64
+ __ movq(rcx, rax);
+#else // _WIN64
+ __ movq(rdi, rax);
+#endif
+ __ movq(kScratchRegister,
+ FUNCTION_ADDR(Runtime::PerformGC),
+ RelocInfo::RUNTIME_ENTRY);
+ __ call(kScratchRegister);
+ }
+
+ ExternalReference scope_depth =
+ ExternalReference::heap_always_allocate_scope_depth();
+ if (always_allocate_scope) {
+ __ movq(kScratchRegister, scope_depth);
+ __ incl(Operand(kScratchRegister, 0));
+ }
+
+ // Call C function.
+#ifdef _WIN64
+ // Windows 64-bit ABI passes arguments in rcx, rdx, r8, r9
+ // Store Arguments object on stack, below the 4 WIN64 ABI parameter slots.
+ __ movq(Operand(rsp, 4 * kPointerSize), r14); // argc.
+ __ movq(Operand(rsp, 5 * kPointerSize), r12); // argv.
+ if (result_size_ < 2) {
+ // Pass a pointer to the Arguments object as the first argument.
+ // Return result in single register (rax).
+ __ lea(rcx, Operand(rsp, 4 * kPointerSize));
+ } else {
+ ASSERT_EQ(2, result_size_);
+ // Pass a pointer to the result location as the first argument.
+ __ lea(rcx, Operand(rsp, 6 * kPointerSize));
+ // Pass a pointer to the Arguments object as the second argument.
+ __ lea(rdx, Operand(rsp, 4 * kPointerSize));
+ }
+
+#else // _WIN64
+ // GCC passes arguments in rdi, rsi, rdx, rcx, r8, r9.
+ __ movq(rdi, r14); // argc.
+ __ movq(rsi, r12); // argv.
+#endif
+ __ call(rbx);
+ // Result is in rax - do not destroy this register!
+
+ if (always_allocate_scope) {
+ __ movq(kScratchRegister, scope_depth);
+ __ decl(Operand(kScratchRegister, 0));
+ }
+
+ // Check for failure result.
+ Label failure_returned;
+ STATIC_ASSERT(((kFailureTag + 1) & kFailureTagMask) == 0);
+#ifdef _WIN64
+ // If return value is on the stack, pop it to registers.
+ if (result_size_ > 1) {
+ ASSERT_EQ(2, result_size_);
+ // Read result values stored on stack. Result is stored
+ // above the four argument mirror slots and the two
+ // Arguments object slots.
+ __ movq(rax, Operand(rsp, 6 * kPointerSize));
+ __ movq(rdx, Operand(rsp, 7 * kPointerSize));
+ }
+#endif
+ __ lea(rcx, Operand(rax, 1));
+ // Lower 2 bits of rcx are 0 iff rax has failure tag.
+ __ testl(rcx, Immediate(kFailureTagMask));
+ __ j(zero, &failure_returned);
+
+ // Exit the JavaScript to C++ exit frame.
+ __ LeaveExitFrame(result_size_);
+ __ ret(0);
+
+ // Handling of failure.
+ __ bind(&failure_returned);
+
+ Label retry;
+ // If the returned exception is RETRY_AFTER_GC continue at retry label
+ STATIC_ASSERT(Failure::RETRY_AFTER_GC == 0);
+ __ testl(rax, Immediate(((1 << kFailureTypeTagSize) - 1) << kFailureTagSize));
+ __ j(zero, &retry);
+
+ // Special handling of out of memory exceptions.
+ __ movq(kScratchRegister, Failure::OutOfMemoryException(), RelocInfo::NONE);
+ __ cmpq(rax, kScratchRegister);
+ __ j(equal, throw_out_of_memory_exception);
+
+ // Retrieve the pending exception and clear the variable.
+ ExternalReference pending_exception_address(Top::k_pending_exception_address);
+ __ movq(kScratchRegister, pending_exception_address);
+ __ movq(rax, Operand(kScratchRegister, 0));
+ __ movq(rdx, ExternalReference::the_hole_value_location());
+ __ movq(rdx, Operand(rdx, 0));
+ __ movq(Operand(kScratchRegister, 0), rdx);
+
+ // Special handling of termination exceptions which are uncatchable
+ // by javascript code.
+ __ CompareRoot(rax, Heap::kTerminationExceptionRootIndex);
+ __ j(equal, throw_termination_exception);
+
+ // Handle normal exception.
+ __ jmp(throw_normal_exception);
+
+ // Retry.
+ __ bind(&retry);
+}
+
+
+void CEntryStub::GenerateThrowUncatchable(MacroAssembler* masm,
+ UncatchableExceptionType type) {
+ // Fetch top stack handler.
+ ExternalReference handler_address(Top::k_handler_address);
+ __ movq(kScratchRegister, handler_address);
+ __ movq(rsp, Operand(kScratchRegister, 0));
+
+ // Unwind the handlers until the ENTRY handler is found.
+ Label loop, done;
+ __ bind(&loop);
+ // Load the type of the current stack handler.
+ const int kStateOffset = StackHandlerConstants::kStateOffset;
+ __ cmpq(Operand(rsp, kStateOffset), Immediate(StackHandler::ENTRY));
+ __ j(equal, &done);
+ // Fetch the next handler in the list.
+ const int kNextOffset = StackHandlerConstants::kNextOffset;
+ __ movq(rsp, Operand(rsp, kNextOffset));
+ __ jmp(&loop);
+ __ bind(&done);
+
+ // Set the top handler address to next handler past the current ENTRY handler.
+ __ movq(kScratchRegister, handler_address);
+ __ pop(Operand(kScratchRegister, 0));
+
+ if (type == OUT_OF_MEMORY) {
+ // Set external caught exception to false.
+ ExternalReference external_caught(Top::k_external_caught_exception_address);
+ __ movq(rax, Immediate(false));
+ __ store_rax(external_caught);
+
+ // Set pending exception and rax to out of memory exception.
+ ExternalReference pending_exception(Top::k_pending_exception_address);
+ __ movq(rax, Failure::OutOfMemoryException(), RelocInfo::NONE);
+ __ store_rax(pending_exception);
+ }
+
+ // Clear the context pointer.
+ __ xor_(rsi, rsi);
+
+ // Restore registers from handler.
+ STATIC_ASSERT(StackHandlerConstants::kNextOffset + kPointerSize ==
+ StackHandlerConstants::kFPOffset);
+ __ pop(rbp); // FP
+ STATIC_ASSERT(StackHandlerConstants::kFPOffset + kPointerSize ==
+ StackHandlerConstants::kStateOffset);
+ __ pop(rdx); // State
+
+ STATIC_ASSERT(StackHandlerConstants::kStateOffset + kPointerSize ==
+ StackHandlerConstants::kPCOffset);
+ __ ret(0);
+}
+
+
+void CEntryStub::Generate(MacroAssembler* masm) {
+ // rax: number of arguments including receiver
+ // rbx: pointer to C function (C callee-saved)
+ // rbp: frame pointer of calling JS frame (restored after C call)
+ // rsp: stack pointer (restored after C call)
+ // rsi: current context (restored)
+
+ // NOTE: Invocations of builtins may return failure objects
+ // instead of a proper result. The builtin entry handles
+ // this by performing a garbage collection and retrying the
+ // builtin once.
+
+ // Enter the exit frame that transitions from JavaScript to C++.
+ __ EnterExitFrame(result_size_);
+
+ // rax: Holds the context at this point, but should not be used.
+ // On entry to code generated by GenerateCore, it must hold
+ // a failure result if the collect_garbage argument to GenerateCore
+ // is true. This failure result can be the result of code
+ // generated by a previous call to GenerateCore. The value
+ // of rax is then passed to Runtime::PerformGC.
+ // rbx: pointer to builtin function (C callee-saved).
+ // rbp: frame pointer of exit frame (restored after C call).
+ // rsp: stack pointer (restored after C call).
+ // r14: number of arguments including receiver (C callee-saved).
+ // r12: argv pointer (C callee-saved).
+
+ Label throw_normal_exception;
+ Label throw_termination_exception;
+ Label throw_out_of_memory_exception;
+
+ // Call into the runtime system.
+ GenerateCore(masm,
+ &throw_normal_exception,
+ &throw_termination_exception,
+ &throw_out_of_memory_exception,
+ false,
+ false);
+
+ // Do space-specific GC and retry runtime call.
+ GenerateCore(masm,
+ &throw_normal_exception,
+ &throw_termination_exception,
+ &throw_out_of_memory_exception,
+ true,
+ false);
+
+ // Do full GC and retry runtime call one final time.
+ Failure* failure = Failure::InternalError();
+ __ movq(rax, failure, RelocInfo::NONE);
+ GenerateCore(masm,
+ &throw_normal_exception,
+ &throw_termination_exception,
+ &throw_out_of_memory_exception,
+ true,
+ true);
+
+ __ bind(&throw_out_of_memory_exception);
+ GenerateThrowUncatchable(masm, OUT_OF_MEMORY);
+
+ __ bind(&throw_termination_exception);
+ GenerateThrowUncatchable(masm, TERMINATION);
+
+ __ bind(&throw_normal_exception);
+ GenerateThrowTOS(masm);
+}
+
+
+void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
+ Label invoke, exit;
+#ifdef ENABLE_LOGGING_AND_PROFILING
+ Label not_outermost_js, not_outermost_js_2;
+#endif
+
+ // Setup frame.
+ __ push(rbp);
+ __ movq(rbp, rsp);
+
+ // Push the stack frame type marker twice.
+ int marker = is_construct ? StackFrame::ENTRY_CONSTRUCT : StackFrame::ENTRY;
+ // Scratch register is neither callee-save, nor an argument register on any
+ // platform. It's free to use at this point.
+ // Cannot use smi-register for loading yet.
+ __ movq(kScratchRegister,
+ reinterpret_cast<uint64_t>(Smi::FromInt(marker)),
+ RelocInfo::NONE);
+ __ push(kScratchRegister); // context slot
+ __ push(kScratchRegister); // function slot
+ // Save callee-saved registers (X64/Win64 calling conventions).
+ __ push(r12);
+ __ push(r13);
+ __ push(r14);
+ __ push(r15);
+#ifdef _WIN64
+ __ push(rdi); // Only callee save in Win64 ABI, argument in AMD64 ABI.
+ __ push(rsi); // Only callee save in Win64 ABI, argument in AMD64 ABI.
+#endif
+ __ push(rbx);
+ // TODO(X64): On Win64, if we ever use XMM6-XMM15, the low low 64 bits are
+ // callee save as well.
+
+ // Save copies of the top frame descriptor on the stack.
+ ExternalReference c_entry_fp(Top::k_c_entry_fp_address);
+ __ load_rax(c_entry_fp);
+ __ push(rax);
+
+ // Set up the roots and smi constant registers.
+ // Needs to be done before any further smi loads.
+ ExternalReference roots_address = ExternalReference::roots_address();
+ __ movq(kRootRegister, roots_address);
+ __ InitializeSmiConstantRegister();
+
+#ifdef ENABLE_LOGGING_AND_PROFILING
+ // If this is the outermost JS call, set js_entry_sp value.
+ ExternalReference js_entry_sp(Top::k_js_entry_sp_address);
+ __ load_rax(js_entry_sp);
+ __ testq(rax, rax);
+ __ j(not_zero, ¬_outermost_js);
+ __ movq(rax, rbp);
+ __ store_rax(js_entry_sp);
+ __ bind(¬_outermost_js);
+#endif
+
+ // Call a faked try-block that does the invoke.
+ __ call(&invoke);
+
+ // Caught exception: Store result (exception) in the pending
+ // exception field in the JSEnv and return a failure sentinel.
+ ExternalReference pending_exception(Top::k_pending_exception_address);
+ __ store_rax(pending_exception);
+ __ movq(rax, Failure::Exception(), RelocInfo::NONE);
+ __ jmp(&exit);
+
+ // Invoke: Link this frame into the handler chain.
+ __ bind(&invoke);
+ __ PushTryHandler(IN_JS_ENTRY, JS_ENTRY_HANDLER);
+
+ // Clear any pending exceptions.
+ __ load_rax(ExternalReference::the_hole_value_location());
+ __ store_rax(pending_exception);
+
+ // Fake a receiver (NULL).
+ __ push(Immediate(0)); // receiver
+
+ // Invoke the function by calling through JS entry trampoline
+ // builtin and pop the faked function when we return. We load the address
+ // from an external reference instead of inlining the call target address
+ // directly in the code, because the builtin stubs may not have been
+ // generated yet at the time this code is generated.
+ if (is_construct) {
+ ExternalReference construct_entry(Builtins::JSConstructEntryTrampoline);
+ __ load_rax(construct_entry);
+ } else {
+ ExternalReference entry(Builtins::JSEntryTrampoline);
+ __ load_rax(entry);
+ }
+ __ lea(kScratchRegister, FieldOperand(rax, Code::kHeaderSize));
+ __ call(kScratchRegister);
+
+ // Unlink this frame from the handler chain.
+ __ movq(kScratchRegister, ExternalReference(Top::k_handler_address));
+ __ pop(Operand(kScratchRegister, 0));
+ // Pop next_sp.
+ __ addq(rsp, Immediate(StackHandlerConstants::kSize - kPointerSize));
+
+#ifdef ENABLE_LOGGING_AND_PROFILING
+ // If current EBP value is the same as js_entry_sp value, it means that
+ // the current function is the outermost.
+ __ movq(kScratchRegister, js_entry_sp);
+ __ cmpq(rbp, Operand(kScratchRegister, 0));
+ __ j(not_equal, ¬_outermost_js_2);
+ __ movq(Operand(kScratchRegister, 0), Immediate(0));
+ __ bind(¬_outermost_js_2);
+#endif
+
+ // Restore the top frame descriptor from the stack.
+ __ bind(&exit);
+ __ movq(kScratchRegister, ExternalReference(Top::k_c_entry_fp_address));
+ __ pop(Operand(kScratchRegister, 0));
+
+ // Restore callee-saved registers (X64 conventions).
+ __ pop(rbx);
+#ifdef _WIN64
+ // Callee save on in Win64 ABI, arguments/volatile in AMD64 ABI.
+ __ pop(rsi);
+ __ pop(rdi);
+#endif
+ __ pop(r15);
+ __ pop(r14);
+ __ pop(r13);
+ __ pop(r12);
+ __ addq(rsp, Immediate(2 * kPointerSize)); // remove markers
+
+ // Restore frame pointer and return.
+ __ pop(rbp);
+ __ ret(0);
+}
+
+
+void InstanceofStub::Generate(MacroAssembler* masm) {
+ // Implements "value instanceof function" operator.
+ // Expected input state:
+ // rsp[0] : return address
+ // rsp[1] : function pointer
+ // rsp[2] : value
+ // Returns a bitwise zero to indicate that the value
+ // is and instance of the function and anything else to
+ // indicate that the value is not an instance.
+
+ // Get the object - go slow case if it's a smi.
+ Label slow;
+ __ movq(rax, Operand(rsp, 2 * kPointerSize));
+ __ JumpIfSmi(rax, &slow);
+
+ // Check that the left hand is a JS object. Leave its map in rax.
+ __ CmpObjectType(rax, FIRST_JS_OBJECT_TYPE, rax);
+ __ j(below, &slow);
+ __ CmpInstanceType(rax, LAST_JS_OBJECT_TYPE);
+ __ j(above, &slow);
+
+ // Get the prototype of the function.
+ __ movq(rdx, Operand(rsp, 1 * kPointerSize));
+ // rdx is function, rax is map.
+
+ // Look up the function and the map in the instanceof cache.
+ Label miss;
+ __ CompareRoot(rdx, Heap::kInstanceofCacheFunctionRootIndex);
+ __ j(not_equal, &miss);
+ __ CompareRoot(rax, Heap::kInstanceofCacheMapRootIndex);
+ __ j(not_equal, &miss);
+ __ LoadRoot(rax, Heap::kInstanceofCacheAnswerRootIndex);
+ __ ret(2 * kPointerSize);
+
+ __ bind(&miss);
+ __ TryGetFunctionPrototype(rdx, rbx, &slow);
+
+ // Check that the function prototype is a JS object.
+ __ JumpIfSmi(rbx, &slow);
+ __ CmpObjectType(rbx, FIRST_JS_OBJECT_TYPE, kScratchRegister);
+ __ j(below, &slow);
+ __ CmpInstanceType(kScratchRegister, LAST_JS_OBJECT_TYPE);
+ __ j(above, &slow);
+
+ // Register mapping:
+ // rax is object map.
+ // rdx is function.
+ // rbx is function prototype.
+ __ StoreRoot(rdx, Heap::kInstanceofCacheFunctionRootIndex);
+ __ StoreRoot(rax, Heap::kInstanceofCacheMapRootIndex);
+
+ __ movq(rcx, FieldOperand(rax, Map::kPrototypeOffset));
+
+ // Loop through the prototype chain looking for the function prototype.
+ Label loop, is_instance, is_not_instance;
+ __ LoadRoot(kScratchRegister, Heap::kNullValueRootIndex);
+ __ bind(&loop);
+ __ cmpq(rcx, rbx);
+ __ j(equal, &is_instance);
+ __ cmpq(rcx, kScratchRegister);
+ // The code at is_not_instance assumes that kScratchRegister contains a
+ // non-zero GCable value (the null object in this case).
+ __ j(equal, &is_not_instance);
+ __ movq(rcx, FieldOperand(rcx, HeapObject::kMapOffset));
+ __ movq(rcx, FieldOperand(rcx, Map::kPrototypeOffset));
+ __ jmp(&loop);
+
+ __ bind(&is_instance);
+ __ xorl(rax, rax);
+ // Store bitwise zero in the cache. This is a Smi in GC terms.
+ STATIC_ASSERT(kSmiTag == 0);
+ __ StoreRoot(rax, Heap::kInstanceofCacheAnswerRootIndex);
+ __ ret(2 * kPointerSize);
+
+ __ bind(&is_not_instance);
+ // We have to store a non-zero value in the cache.
+ __ StoreRoot(kScratchRegister, Heap::kInstanceofCacheAnswerRootIndex);
+ __ ret(2 * kPointerSize);
+
+ // Slow-case: Go through the JavaScript implementation.
+ __ bind(&slow);
+ __ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION);
+}
+
+
+int CompareStub::MinorKey() {
+ // Encode the three parameters in a unique 16 bit value. To avoid duplicate
+ // stubs the never NaN NaN condition is only taken into account if the
+ // condition is equals.
+ ASSERT(static_cast<unsigned>(cc_) < (1 << 12));
+ ASSERT(lhs_.is(no_reg) && rhs_.is(no_reg));
+ return ConditionField::encode(static_cast<unsigned>(cc_))
+ | RegisterField::encode(false) // lhs_ and rhs_ are not used
+ | StrictField::encode(strict_)
+ | NeverNanNanField::encode(cc_ == equal ? never_nan_nan_ : false)
+ | IncludeNumberCompareField::encode(include_number_compare_);
+}
+
+
+// Unfortunately you have to run without snapshots to see most of these
+// names in the profile since most compare stubs end up in the snapshot.
+const char* CompareStub::GetName() {
+ ASSERT(lhs_.is(no_reg) && rhs_.is(no_reg));
+
+ if (name_ != NULL) return name_;
+ const int kMaxNameLength = 100;
+ name_ = Bootstrapper::AllocateAutoDeletedArray(kMaxNameLength);
+ if (name_ == NULL) return "OOM";
+
+ const char* cc_name;
+ switch (cc_) {
+ case less: cc_name = "LT"; break;
+ case greater: cc_name = "GT"; break;
+ case less_equal: cc_name = "LE"; break;
+ case greater_equal: cc_name = "GE"; break;
+ case equal: cc_name = "EQ"; break;
+ case not_equal: cc_name = "NE"; break;
+ default: cc_name = "UnknownCondition"; break;
+ }
+
+ const char* strict_name = "";
+ if (strict_ && (cc_ == equal || cc_ == not_equal)) {
+ strict_name = "_STRICT";
+ }
+
+ const char* never_nan_nan_name = "";
+ if (never_nan_nan_ && (cc_ == equal || cc_ == not_equal)) {
+ never_nan_nan_name = "_NO_NAN";
+ }
+
+ const char* include_number_compare_name = "";
+ if (!include_number_compare_) {
+ include_number_compare_name = "_NO_NUMBER";
+ }
+
+ OS::SNPrintF(Vector<char>(name_, kMaxNameLength),
+ "CompareStub_%s%s%s%s",
+ cc_name,
+ strict_name,
+ never_nan_nan_name,
+ include_number_compare_name);
+ return name_;
+}
+
+
+// -------------------------------------------------------------------------
+// StringCharCodeAtGenerator
+
+void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) {
+ Label flat_string;
+ Label ascii_string;
+ Label got_char_code;
+
+ // If the receiver is a smi trigger the non-string case.
+ __ JumpIfSmi(object_, receiver_not_string_);
+
+ // Fetch the instance type of the receiver into result register.
+ __ movq(result_, FieldOperand(object_, HeapObject::kMapOffset));
+ __ movzxbl(result_, FieldOperand(result_, Map::kInstanceTypeOffset));
+ // If the receiver is not a string trigger the non-string case.
+ __ testb(result_, Immediate(kIsNotStringMask));
+ __ j(not_zero, receiver_not_string_);
+
+ // If the index is non-smi trigger the non-smi case.
+ __ JumpIfNotSmi(index_, &index_not_smi_);
+
+ // Put smi-tagged index into scratch register.
+ __ movq(scratch_, index_);
+ __ bind(&got_smi_index_);
+
+ // Check for index out of range.
+ __ SmiCompare(scratch_, FieldOperand(object_, String::kLengthOffset));
+ __ j(above_equal, index_out_of_range_);
+
+ // We need special handling for non-flat strings.
+ STATIC_ASSERT(kSeqStringTag == 0);
+ __ testb(result_, Immediate(kStringRepresentationMask));
+ __ j(zero, &flat_string);
+
+ // Handle non-flat strings.
+ __ testb(result_, Immediate(kIsConsStringMask));
+ __ j(zero, &call_runtime_);
+
+ // ConsString.
+ // Check whether the right hand side is the empty string (i.e. if
+ // this is really a flat string in a cons string). If that is not
+ // the case we would rather go to the runtime system now to flatten
+ // the string.
+ __ CompareRoot(FieldOperand(object_, ConsString::kSecondOffset),
+ Heap::kEmptyStringRootIndex);
+ __ j(not_equal, &call_runtime_);
+ // Get the first of the two strings and load its instance type.
+ __ movq(object_, FieldOperand(object_, ConsString::kFirstOffset));
+ __ movq(result_, FieldOperand(object_, HeapObject::kMapOffset));
+ __ movzxbl(result_, FieldOperand(result_, Map::kInstanceTypeOffset));
+ // If the first cons component is also non-flat, then go to runtime.
+ STATIC_ASSERT(kSeqStringTag == 0);
+ __ testb(result_, Immediate(kStringRepresentationMask));
+ __ j(not_zero, &call_runtime_);
+
+ // Check for 1-byte or 2-byte string.
+ __ bind(&flat_string);
+ STATIC_ASSERT(kAsciiStringTag != 0);
+ __ testb(result_, Immediate(kStringEncodingMask));
+ __ j(not_zero, &ascii_string);
+
+ // 2-byte string.
+ // Load the 2-byte character code into the result register.
+ __ SmiToInteger32(scratch_, scratch_);
+ __ movzxwl(result_, FieldOperand(object_,
+ scratch_, times_2,
+ SeqTwoByteString::kHeaderSize));
+ __ jmp(&got_char_code);
+
+ // ASCII string.
+ // Load the byte into the result register.
+ __ bind(&ascii_string);
+ __ SmiToInteger32(scratch_, scratch_);
+ __ movzxbl(result_, FieldOperand(object_,
+ scratch_, times_1,
+ SeqAsciiString::kHeaderSize));
+ __ bind(&got_char_code);
+ __ Integer32ToSmi(result_, result_);
+ __ bind(&exit_);
+}
+
+
+void StringCharCodeAtGenerator::GenerateSlow(
+ MacroAssembler* masm, const RuntimeCallHelper& call_helper) {
+ __ Abort("Unexpected fallthrough to CharCodeAt slow case");
+
+ // Index is not a smi.
+ __ bind(&index_not_smi_);
+ // If index is a heap number, try converting it to an integer.
+ __ CheckMap(index_, Factory::heap_number_map(), index_not_number_, true);
+ call_helper.BeforeCall(masm);
+ __ push(object_);
+ __ push(index_);
+ __ push(index_); // Consumed by runtime conversion function.
+ if (index_flags_ == STRING_INDEX_IS_NUMBER) {
+ __ CallRuntime(Runtime::kNumberToIntegerMapMinusZero, 1);
+ } else {
+ ASSERT(index_flags_ == STRING_INDEX_IS_ARRAY_INDEX);
+ // NumberToSmi discards numbers that are not exact integers.
+ __ CallRuntime(Runtime::kNumberToSmi, 1);
+ }
+ if (!scratch_.is(rax)) {
+ // Save the conversion result before the pop instructions below
+ // have a chance to overwrite it.
+ __ movq(scratch_, rax);
+ }
+ __ pop(index_);
+ __ pop(object_);
+ // Reload the instance type.
+ __ movq(result_, FieldOperand(object_, HeapObject::kMapOffset));
+ __ movzxbl(result_, FieldOperand(result_, Map::kInstanceTypeOffset));
+ call_helper.AfterCall(masm);
+ // If index is still not a smi, it must be out of range.
+ __ JumpIfNotSmi(scratch_, index_out_of_range_);
+ // Otherwise, return to the fast path.
+ __ jmp(&got_smi_index_);
+
+ // Call runtime. We get here when the receiver is a string and the
+ // index is a number, but the code of getting the actual character
+ // is too complex (e.g., when the string needs to be flattened).
+ __ bind(&call_runtime_);
+ call_helper.BeforeCall(masm);
+ __ push(object_);
+ __ push(index_);
+ __ CallRuntime(Runtime::kStringCharCodeAt, 2);
+ if (!result_.is(rax)) {
+ __ movq(result_, rax);
+ }
+ call_helper.AfterCall(masm);
+ __ jmp(&exit_);
+
+ __ Abort("Unexpected fallthrough from CharCodeAt slow case");
+}
+
+
+// -------------------------------------------------------------------------
+// StringCharFromCodeGenerator
+
+void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) {
+ // Fast case of Heap::LookupSingleCharacterStringFromCode.
+ __ JumpIfNotSmi(code_, &slow_case_);
+ __ SmiCompare(code_, Smi::FromInt(String::kMaxAsciiCharCode));
+ __ j(above, &slow_case_);
+
+ __ LoadRoot(result_, Heap::kSingleCharacterStringCacheRootIndex);
+ SmiIndex index = masm->SmiToIndex(kScratchRegister, code_, kPointerSizeLog2);
+ __ movq(result_, FieldOperand(result_, index.reg, index.scale,
+ FixedArray::kHeaderSize));
+ __ CompareRoot(result_, Heap::kUndefinedValueRootIndex);
+ __ j(equal, &slow_case_);
+ __ bind(&exit_);
+}
+
+
+void StringCharFromCodeGenerator::GenerateSlow(
+ MacroAssembler* masm, const RuntimeCallHelper& call_helper) {
+ __ Abort("Unexpected fallthrough to CharFromCode slow case");
+
+ __ bind(&slow_case_);
+ call_helper.BeforeCall(masm);
+ __ push(code_);
+ __ CallRuntime(Runtime::kCharFromCode, 1);
+ if (!result_.is(rax)) {
+ __ movq(result_, rax);
+ }
+ call_helper.AfterCall(masm);
+ __ jmp(&exit_);
+
+ __ Abort("Unexpected fallthrough from CharFromCode slow case");
+}
+
+
+// -------------------------------------------------------------------------
+// StringCharAtGenerator
+
+void StringCharAtGenerator::GenerateFast(MacroAssembler* masm) {
+ char_code_at_generator_.GenerateFast(masm);
+ char_from_code_generator_.GenerateFast(masm);
+}
+
+
+void StringCharAtGenerator::GenerateSlow(
+ MacroAssembler* masm, const RuntimeCallHelper& call_helper) {
+ char_code_at_generator_.GenerateSlow(masm, call_helper);
+ char_from_code_generator_.GenerateSlow(masm, call_helper);
+}
+
+
+void StringAddStub::Generate(MacroAssembler* masm) {
+ Label string_add_runtime;
+
+ // Load the two arguments.
+ __ movq(rax, Operand(rsp, 2 * kPointerSize)); // First argument.
+ __ movq(rdx, Operand(rsp, 1 * kPointerSize)); // Second argument.
+
+ // Make sure that both arguments are strings if not known in advance.
+ if (string_check_) {
+ Condition is_smi;
+ is_smi = masm->CheckSmi(rax);
+ __ j(is_smi, &string_add_runtime);
+ __ CmpObjectType(rax, FIRST_NONSTRING_TYPE, r8);
+ __ j(above_equal, &string_add_runtime);
+
+ // First argument is a a string, test second.
+ is_smi = masm->CheckSmi(rdx);
+ __ j(is_smi, &string_add_runtime);
+ __ CmpObjectType(rdx, FIRST_NONSTRING_TYPE, r9);
+ __ j(above_equal, &string_add_runtime);
+ }
+
+ // Both arguments are strings.
+ // rax: first string
+ // rdx: second string
+ // Check if either of the strings are empty. In that case return the other.
+ Label second_not_zero_length, both_not_zero_length;
+ __ movq(rcx, FieldOperand(rdx, String::kLengthOffset));
+ __ SmiTest(rcx);
+ __ j(not_zero, &second_not_zero_length);
+ // Second string is empty, result is first string which is already in rax.
+ __ IncrementCounter(&Counters::string_add_native, 1);
+ __ ret(2 * kPointerSize);
+ __ bind(&second_not_zero_length);
+ __ movq(rbx, FieldOperand(rax, String::kLengthOffset));
+ __ SmiTest(rbx);
+ __ j(not_zero, &both_not_zero_length);
+ // First string is empty, result is second string which is in rdx.
+ __ movq(rax, rdx);
+ __ IncrementCounter(&Counters::string_add_native, 1);
+ __ ret(2 * kPointerSize);
+
+ // Both strings are non-empty.
+ // rax: first string
+ // rbx: length of first string
+ // rcx: length of second string
+ // rdx: second string
+ // r8: map of first string if string check was performed above
+ // r9: map of second string if string check was performed above
+ Label string_add_flat_result, longer_than_two;
+ __ bind(&both_not_zero_length);
+
+ // If arguments where known to be strings, maps are not loaded to r8 and r9
+ // by the code above.
+ if (!string_check_) {
+ __ movq(r8, FieldOperand(rax, HeapObject::kMapOffset));
+ __ movq(r9, FieldOperand(rdx, HeapObject::kMapOffset));
+ }
+ // Get the instance types of the two strings as they will be needed soon.
+ __ movzxbl(r8, FieldOperand(r8, Map::kInstanceTypeOffset));
+ __ movzxbl(r9, FieldOperand(r9, Map::kInstanceTypeOffset));
+
+ // Look at the length of the result of adding the two strings.
+ STATIC_ASSERT(String::kMaxLength <= Smi::kMaxValue / 2);
+ __ SmiAdd(rbx, rbx, rcx, NULL);
+ // Use the runtime system when adding two one character strings, as it
+ // contains optimizations for this specific case using the symbol table.
+ __ SmiCompare(rbx, Smi::FromInt(2));
+ __ j(not_equal, &longer_than_two);
+
+ // Check that both strings are non-external ascii strings.
+ __ JumpIfBothInstanceTypesAreNotSequentialAscii(r8, r9, rbx, rcx,
+ &string_add_runtime);
+
+ // Get the two characters forming the sub string.
+ __ movzxbq(rbx, FieldOperand(rax, SeqAsciiString::kHeaderSize));
+ __ movzxbq(rcx, FieldOperand(rdx, SeqAsciiString::kHeaderSize));
+
+ // Try to lookup two character string in symbol table. If it is not found
+ // just allocate a new one.
+ Label make_two_character_string, make_flat_ascii_string;
+ StringHelper::GenerateTwoCharacterSymbolTableProbe(
+ masm, rbx, rcx, r14, r11, rdi, r12, &make_two_character_string);
+ __ IncrementCounter(&Counters::string_add_native, 1);
+ __ ret(2 * kPointerSize);
+
+ __ bind(&make_two_character_string);
+ __ Set(rbx, 2);
+ __ jmp(&make_flat_ascii_string);
+
+ __ bind(&longer_than_two);
+ // Check if resulting string will be flat.
+ __ SmiCompare(rbx, Smi::FromInt(String::kMinNonFlatLength));
+ __ j(below, &string_add_flat_result);
+ // Handle exceptionally long strings in the runtime system.
+ STATIC_ASSERT((String::kMaxLength & 0x80000000) == 0);
+ __ SmiCompare(rbx, Smi::FromInt(String::kMaxLength));
+ __ j(above, &string_add_runtime);
+
+ // If result is not supposed to be flat, allocate a cons string object. If
+ // both strings are ascii the result is an ascii cons string.
+ // rax: first string
+ // rbx: length of resulting flat string
+ // rdx: second string
+ // r8: instance type of first string
+ // r9: instance type of second string
+ Label non_ascii, allocated, ascii_data;
+ __ movl(rcx, r8);
+ __ and_(rcx, r9);
+ STATIC_ASSERT(kStringEncodingMask == kAsciiStringTag);
+ __ testl(rcx, Immediate(kAsciiStringTag));
+ __ j(zero, &non_ascii);
+ __ bind(&ascii_data);
+ // Allocate an acsii cons string.
+ __ AllocateAsciiConsString(rcx, rdi, no_reg, &string_add_runtime);
+ __ bind(&allocated);
+ // Fill the fields of the cons string.
+ __ movq(FieldOperand(rcx, ConsString::kLengthOffset), rbx);
+ __ movq(FieldOperand(rcx, ConsString::kHashFieldOffset),
+ Immediate(String::kEmptyHashField));
+ __ movq(FieldOperand(rcx, ConsString::kFirstOffset), rax);
+ __ movq(FieldOperand(rcx, ConsString::kSecondOffset), rdx);
+ __ movq(rax, rcx);
+ __ IncrementCounter(&Counters::string_add_native, 1);
+ __ ret(2 * kPointerSize);
+ __ bind(&non_ascii);
+ // At least one of the strings is two-byte. Check whether it happens
+ // to contain only ascii characters.
+ // rcx: first instance type AND second instance type.
+ // r8: first instance type.
+ // r9: second instance type.
+ __ testb(rcx, Immediate(kAsciiDataHintMask));
+ __ j(not_zero, &ascii_data);
+ __ xor_(r8, r9);
+ STATIC_ASSERT(kAsciiStringTag != 0 && kAsciiDataHintTag != 0);
+ __ andb(r8, Immediate(kAsciiStringTag | kAsciiDataHintTag));
+ __ cmpb(r8, Immediate(kAsciiStringTag | kAsciiDataHintTag));
+ __ j(equal, &ascii_data);
+ // Allocate a two byte cons string.
+ __ AllocateConsString(rcx, rdi, no_reg, &string_add_runtime);
+ __ jmp(&allocated);
+
+ // Handle creating a flat result. First check that both strings are not
+ // external strings.
+ // rax: first string
+ // rbx: length of resulting flat string as smi
+ // rdx: second string
+ // r8: instance type of first string
+ // r9: instance type of first string
+ __ bind(&string_add_flat_result);
+ __ SmiToInteger32(rbx, rbx);
+ __ movl(rcx, r8);
+ __ and_(rcx, Immediate(kStringRepresentationMask));
+ __ cmpl(rcx, Immediate(kExternalStringTag));
+ __ j(equal, &string_add_runtime);
+ __ movl(rcx, r9);
+ __ and_(rcx, Immediate(kStringRepresentationMask));
+ __ cmpl(rcx, Immediate(kExternalStringTag));
+ __ j(equal, &string_add_runtime);
+ // Now check if both strings are ascii strings.
+ // rax: first string
+ // rbx: length of resulting flat string
+ // rdx: second string
+ // r8: instance type of first string
+ // r9: instance type of second string
+ Label non_ascii_string_add_flat_result;
+ STATIC_ASSERT(kStringEncodingMask == kAsciiStringTag);
+ __ testl(r8, Immediate(kAsciiStringTag));
+ __ j(zero, &non_ascii_string_add_flat_result);
+ __ testl(r9, Immediate(kAsciiStringTag));
+ __ j(zero, &string_add_runtime);
+
+ __ bind(&make_flat_ascii_string);
+ // Both strings are ascii strings. As they are short they are both flat.
+ __ AllocateAsciiString(rcx, rbx, rdi, r14, r11, &string_add_runtime);
+ // rcx: result string
+ __ movq(rbx, rcx);
+ // Locate first character of result.
+ __ addq(rcx, Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag));
+ // Locate first character of first argument
+ __ SmiToInteger32(rdi, FieldOperand(rax, String::kLengthOffset));
+ __ addq(rax, Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag));
+ // rax: first char of first argument
+ // rbx: result string
+ // rcx: first character of result
+ // rdx: second string
+ // rdi: length of first argument
+ StringHelper::GenerateCopyCharacters(masm, rcx, rax, rdi, true);
+ // Locate first character of second argument.
+ __ SmiToInteger32(rdi, FieldOperand(rdx, String::kLengthOffset));
+ __ addq(rdx, Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag));
+ // rbx: result string
+ // rcx: next character of result
+ // rdx: first char of second argument
+ // rdi: length of second argument
+ StringHelper::GenerateCopyCharacters(masm, rcx, rdx, rdi, true);
+ __ movq(rax, rbx);
+ __ IncrementCounter(&Counters::string_add_native, 1);
+ __ ret(2 * kPointerSize);
+
+ // Handle creating a flat two byte result.
+ // rax: first string - known to be two byte
+ // rbx: length of resulting flat string
+ // rdx: second string
+ // r8: instance type of first string
+ // r9: instance type of first string
+ __ bind(&non_ascii_string_add_flat_result);
+ __ and_(r9, Immediate(kAsciiStringTag));
+ __ j(not_zero, &string_add_runtime);
+ // Both strings are two byte strings. As they are short they are both
+ // flat.
+ __ AllocateTwoByteString(rcx, rbx, rdi, r14, r11, &string_add_runtime);
+ // rcx: result string
+ __ movq(rbx, rcx);
+ // Locate first character of result.
+ __ addq(rcx, Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
+ // Locate first character of first argument.
+ __ SmiToInteger32(rdi, FieldOperand(rax, String::kLengthOffset));
+ __ addq(rax, Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
+ // rax: first char of first argument
+ // rbx: result string
+ // rcx: first character of result
+ // rdx: second argument
+ // rdi: length of first argument
+ StringHelper::GenerateCopyCharacters(masm, rcx, rax, rdi, false);
+ // Locate first character of second argument.
+ __ SmiToInteger32(rdi, FieldOperand(rdx, String::kLengthOffset));
+ __ addq(rdx, Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
+ // rbx: result string
+ // rcx: next character of result
+ // rdx: first char of second argument
+ // rdi: length of second argument
+ StringHelper::GenerateCopyCharacters(masm, rcx, rdx, rdi, false);
+ __ movq(rax, rbx);
+ __ IncrementCounter(&Counters::string_add_native, 1);
+ __ ret(2 * kPointerSize);
+
+ // Just jump to runtime to add the two strings.
+ __ bind(&string_add_runtime);
+ __ TailCallRuntime(Runtime::kStringAdd, 2, 1);
+}
+
+
+void StringHelper::GenerateCopyCharacters(MacroAssembler* masm,
+ Register dest,
+ Register src,
+ Register count,
+ bool ascii) {
+ Label loop;
+ __ bind(&loop);
+ // This loop just copies one character at a time, as it is only used for very
+ // short strings.
+ if (ascii) {
+ __ movb(kScratchRegister, Operand(src, 0));
+ __ movb(Operand(dest, 0), kScratchRegister);
+ __ incq(src);
+ __ incq(dest);
+ } else {
+ __ movzxwl(kScratchRegister, Operand(src, 0));
+ __ movw(Operand(dest, 0), kScratchRegister);
+ __ addq(src, Immediate(2));
+ __ addq(dest, Immediate(2));
+ }
+ __ decl(count);
+ __ j(not_zero, &loop);
+}
+
+
+void StringHelper::GenerateCopyCharactersREP(MacroAssembler* masm,
+ Register dest,
+ Register src,
+ Register count,
+ bool ascii) {
+ // Copy characters using rep movs of doublewords. Align destination on 4 byte
+ // boundary before starting rep movs. Copy remaining characters after running
+ // rep movs.
+ // Count is positive int32, dest and src are character pointers.
+ ASSERT(dest.is(rdi)); // rep movs destination
+ ASSERT(src.is(rsi)); // rep movs source
+ ASSERT(count.is(rcx)); // rep movs count
+
+ // Nothing to do for zero characters.
+ Label done;
+ __ testl(count, count);
+ __ j(zero, &done);
+
+ // Make count the number of bytes to copy.
+ if (!ascii) {
+ STATIC_ASSERT(2 == sizeof(uc16));
+ __ addl(count, count);
+ }
+
+ // Don't enter the rep movs if there are less than 4 bytes to copy.
+ Label last_bytes;
+ __ testl(count, Immediate(~7));
+ __ j(zero, &last_bytes);
+
+ // Copy from edi to esi using rep movs instruction.
+ __ movl(kScratchRegister, count);
+ __ shr(count, Immediate(3)); // Number of doublewords to copy.
+ __ repmovsq();
+
+ // Find number of bytes left.
+ __ movl(count, kScratchRegister);
+ __ and_(count, Immediate(7));
+
+ // Check if there are more bytes to copy.
+ __ bind(&last_bytes);
+ __ testl(count, count);
+ __ j(zero, &done);
+
+ // Copy remaining characters.
+ Label loop;
+ __ bind(&loop);
+ __ movb(kScratchRegister, Operand(src, 0));
+ __ movb(Operand(dest, 0), kScratchRegister);
+ __ incq(src);
+ __ incq(dest);
+ __ decl(count);
+ __ j(not_zero, &loop);
+
+ __ bind(&done);
+}
+
+void StringHelper::GenerateTwoCharacterSymbolTableProbe(MacroAssembler* masm,
+ Register c1,
+ Register c2,
+ Register scratch1,
+ Register scratch2,
+ Register scratch3,
+ Register scratch4,
+ Label* not_found) {
+ // Register scratch3 is the general scratch register in this function.
+ Register scratch = scratch3;
+
+ // Make sure that both characters are not digits as such strings has a
+ // different hash algorithm. Don't try to look for these in the symbol table.
+ Label not_array_index;
+ __ leal(scratch, Operand(c1, -'0'));
+ __ cmpl(scratch, Immediate(static_cast<int>('9' - '0')));
+ __ j(above, ¬_array_index);
+ __ leal(scratch, Operand(c2, -'0'));
+ __ cmpl(scratch, Immediate(static_cast<int>('9' - '0')));
+ __ j(below_equal, not_found);
+
+ __ bind(¬_array_index);
+ // Calculate the two character string hash.
+ Register hash = scratch1;
+ GenerateHashInit(masm, hash, c1, scratch);
+ GenerateHashAddCharacter(masm, hash, c2, scratch);
+ GenerateHashGetHash(masm, hash, scratch);
+
+ // Collect the two characters in a register.
+ Register chars = c1;
+ __ shl(c2, Immediate(kBitsPerByte));
+ __ orl(chars, c2);
+
+ // chars: two character string, char 1 in byte 0 and char 2 in byte 1.
+ // hash: hash of two character string.
+
+ // Load the symbol table.
+ Register symbol_table = c2;
+ __ LoadRoot(symbol_table, Heap::kSymbolTableRootIndex);
+
+ // Calculate capacity mask from the symbol table capacity.
+ Register mask = scratch2;
+ __ SmiToInteger32(mask,
+ FieldOperand(symbol_table, SymbolTable::kCapacityOffset));
+ __ decl(mask);
+
+ Register undefined = scratch4;
+ __ LoadRoot(undefined, Heap::kUndefinedValueRootIndex);
+
+ // Registers
+ // chars: two character string, char 1 in byte 0 and char 2 in byte 1.
+ // hash: hash of two character string (32-bit int)
+ // symbol_table: symbol table
+ // mask: capacity mask (32-bit int)
+ // undefined: undefined value
+ // scratch: -
+
+ // Perform a number of probes in the symbol table.
+ static const int kProbes = 4;
+ Label found_in_symbol_table;
+ Label next_probe[kProbes];
+ for (int i = 0; i < kProbes; i++) {
+ // Calculate entry in symbol table.
+ __ movl(scratch, hash);
+ if (i > 0) {
+ __ addl(scratch, Immediate(SymbolTable::GetProbeOffset(i)));
+ }
+ __ andl(scratch, mask);
+
+ // Load the entry from the symble table.
+ Register candidate = scratch; // Scratch register contains candidate.
+ STATIC_ASSERT(SymbolTable::kEntrySize == 1);
+ __ movq(candidate,
+ FieldOperand(symbol_table,
+ scratch,
+ times_pointer_size,
+ SymbolTable::kElementsStartOffset));
+
+ // If entry is undefined no string with this hash can be found.
+ __ cmpq(candidate, undefined);
+ __ j(equal, not_found);
+
+ // If length is not 2 the string is not a candidate.
+ __ SmiCompare(FieldOperand(candidate, String::kLengthOffset),
+ Smi::FromInt(2));
+ __ j(not_equal, &next_probe[i]);
+
+ // We use kScratchRegister as a temporary register in assumption that
+ // JumpIfInstanceTypeIsNotSequentialAscii does not use it implicitly
+ Register temp = kScratchRegister;
+
+ // Check that the candidate is a non-external ascii string.
+ __ movq(temp, FieldOperand(candidate, HeapObject::kMapOffset));
+ __ movzxbl(temp, FieldOperand(temp, Map::kInstanceTypeOffset));
+ __ JumpIfInstanceTypeIsNotSequentialAscii(
+ temp, temp, &next_probe[i]);
+
+ // Check if the two characters match.
+ __ movl(temp, FieldOperand(candidate, SeqAsciiString::kHeaderSize));
+ __ andl(temp, Immediate(0x0000ffff));
+ __ cmpl(chars, temp);
+ __ j(equal, &found_in_symbol_table);
+ __ bind(&next_probe[i]);
+ }
+
+ // No matching 2 character string found by probing.
+ __ jmp(not_found);
+
+ // Scratch register contains result when we fall through to here.
+ Register result = scratch;
+ __ bind(&found_in_symbol_table);
+ if (!result.is(rax)) {
+ __ movq(rax, result);
+ }
+}
+
+
+void StringHelper::GenerateHashInit(MacroAssembler* masm,
+ Register hash,
+ Register character,
+ Register scratch) {
+ // hash = character + (character << 10);
+ __ movl(hash, character);
+ __ shll(hash, Immediate(10));
+ __ addl(hash, character);
+ // hash ^= hash >> 6;
+ __ movl(scratch, hash);
+ __ sarl(scratch, Immediate(6));
+ __ xorl(hash, scratch);
+}
+
+
+void StringHelper::GenerateHashAddCharacter(MacroAssembler* masm,
+ Register hash,
+ Register character,
+ Register scratch) {
+ // hash += character;
+ __ addl(hash, character);
+ // hash += hash << 10;
+ __ movl(scratch, hash);
+ __ shll(scratch, Immediate(10));
+ __ addl(hash, scratch);
+ // hash ^= hash >> 6;
+ __ movl(scratch, hash);
+ __ sarl(scratch, Immediate(6));
+ __ xorl(hash, scratch);
+}
+
+
+void StringHelper::GenerateHashGetHash(MacroAssembler* masm,
+ Register hash,
+ Register scratch) {
+ // hash += hash << 3;
+ __ leal(hash, Operand(hash, hash, times_8, 0));
+ // hash ^= hash >> 11;
+ __ movl(scratch, hash);
+ __ sarl(scratch, Immediate(11));
+ __ xorl(hash, scratch);
+ // hash += hash << 15;
+ __ movl(scratch, hash);
+ __ shll(scratch, Immediate(15));
+ __ addl(hash, scratch);
+
+ // if (hash == 0) hash = 27;
+ Label hash_not_zero;
+ __ j(not_zero, &hash_not_zero);
+ __ movl(hash, Immediate(27));
+ __ bind(&hash_not_zero);
+}
+
+void SubStringStub::Generate(MacroAssembler* masm) {
+ Label runtime;
+
+ // Stack frame on entry.
+ // rsp[0]: return address
+ // rsp[8]: to
+ // rsp[16]: from
+ // rsp[24]: string
+
+ const int kToOffset = 1 * kPointerSize;
+ const int kFromOffset = kToOffset + kPointerSize;
+ const int kStringOffset = kFromOffset + kPointerSize;
+ const int kArgumentsSize = (kStringOffset + kPointerSize) - kToOffset;
+
+ // Make sure first argument is a string.
+ __ movq(rax, Operand(rsp, kStringOffset));
+ STATIC_ASSERT(kSmiTag == 0);
+ __ testl(rax, Immediate(kSmiTagMask));
+ __ j(zero, &runtime);
+ Condition is_string = masm->IsObjectStringType(rax, rbx, rbx);
+ __ j(NegateCondition(is_string), &runtime);
+
+ // rax: string
+ // rbx: instance type
+ // Calculate length of sub string using the smi values.
+ Label result_longer_than_two;
+ __ movq(rcx, Operand(rsp, kToOffset));
+ __ movq(rdx, Operand(rsp, kFromOffset));
+ __ JumpIfNotBothPositiveSmi(rcx, rdx, &runtime);
+
+ __ SmiSub(rcx, rcx, rdx, NULL); // Overflow doesn't happen.
+ __ cmpq(FieldOperand(rax, String::kLengthOffset), rcx);
+ Label return_rax;
+ __ j(equal, &return_rax);
+ // Special handling of sub-strings of length 1 and 2. One character strings
+ // are handled in the runtime system (looked up in the single character
+ // cache). Two character strings are looked for in the symbol cache.
+ __ SmiToInteger32(rcx, rcx);
+ __ cmpl(rcx, Immediate(2));
+ __ j(greater, &result_longer_than_two);
+ __ j(less, &runtime);
+
+ // Sub string of length 2 requested.
+ // rax: string
+ // rbx: instance type
+ // rcx: sub string length (value is 2)
+ // rdx: from index (smi)
+ __ JumpIfInstanceTypeIsNotSequentialAscii(rbx, rbx, &runtime);
+
+ // Get the two characters forming the sub string.
+ __ SmiToInteger32(rdx, rdx); // From index is no longer smi.
+ __ movzxbq(rbx, FieldOperand(rax, rdx, times_1, SeqAsciiString::kHeaderSize));
+ __ movzxbq(rcx,
+ FieldOperand(rax, rdx, times_1, SeqAsciiString::kHeaderSize + 1));
+
+ // Try to lookup two character string in symbol table.
+ Label make_two_character_string;
+ StringHelper::GenerateTwoCharacterSymbolTableProbe(
+ masm, rbx, rcx, rax, rdx, rdi, r14, &make_two_character_string);
+ __ ret(3 * kPointerSize);
+
+ __ bind(&make_two_character_string);
+ // Setup registers for allocating the two character string.
+ __ movq(rax, Operand(rsp, kStringOffset));
+ __ movq(rbx, FieldOperand(rax, HeapObject::kMapOffset));
+ __ movzxbl(rbx, FieldOperand(rbx, Map::kInstanceTypeOffset));
+ __ Set(rcx, 2);
+
+ __ bind(&result_longer_than_two);
+
+ // rax: string
+ // rbx: instance type
+ // rcx: result string length
+ // Check for flat ascii string
+ Label non_ascii_flat;
+ __ JumpIfInstanceTypeIsNotSequentialAscii(rbx, rbx, &non_ascii_flat);
+
+ // Allocate the result.
+ __ AllocateAsciiString(rax, rcx, rbx, rdx, rdi, &runtime);
+
+ // rax: result string
+ // rcx: result string length
+ __ movq(rdx, rsi); // esi used by following code.
+ // Locate first character of result.
+ __ lea(rdi, FieldOperand(rax, SeqAsciiString::kHeaderSize));
+ // Load string argument and locate character of sub string start.
+ __ movq(rsi, Operand(rsp, kStringOffset));
+ __ movq(rbx, Operand(rsp, kFromOffset));
+ {
+ SmiIndex smi_as_index = masm->SmiToIndex(rbx, rbx, times_1);
+ __ lea(rsi, Operand(rsi, smi_as_index.reg, smi_as_index.scale,
+ SeqAsciiString::kHeaderSize - kHeapObjectTag));
+ }
+
+ // rax: result string
+ // rcx: result length
+ // rdx: original value of rsi
+ // rdi: first character of result
+ // rsi: character of sub string start
+ StringHelper::GenerateCopyCharactersREP(masm, rdi, rsi, rcx, true);
+ __ movq(rsi, rdx); // Restore rsi.
+ __ IncrementCounter(&Counters::sub_string_native, 1);
+ __ ret(kArgumentsSize);
+
+ __ bind(&non_ascii_flat);
+ // rax: string
+ // rbx: instance type & kStringRepresentationMask | kStringEncodingMask
+ // rcx: result string length
+ // Check for sequential two byte string
+ __ cmpb(rbx, Immediate(kSeqStringTag | kTwoByteStringTag));
+ __ j(not_equal, &runtime);
+
+ // Allocate the result.
+ __ AllocateTwoByteString(rax, rcx, rbx, rdx, rdi, &runtime);
+
+ // rax: result string
+ // rcx: result string length
+ __ movq(rdx, rsi); // esi used by following code.
+ // Locate first character of result.
+ __ lea(rdi, FieldOperand(rax, SeqTwoByteString::kHeaderSize));
+ // Load string argument and locate character of sub string start.
+ __ movq(rsi, Operand(rsp, kStringOffset));
+ __ movq(rbx, Operand(rsp, kFromOffset));
+ {
+ SmiIndex smi_as_index = masm->SmiToIndex(rbx, rbx, times_2);
+ __ lea(rsi, Operand(rsi, smi_as_index.reg, smi_as_index.scale,
+ SeqAsciiString::kHeaderSize - kHeapObjectTag));
+ }
+
+ // rax: result string
+ // rcx: result length
+ // rdx: original value of rsi
+ // rdi: first character of result
+ // rsi: character of sub string start
+ StringHelper::GenerateCopyCharactersREP(masm, rdi, rsi, rcx, false);
+ __ movq(rsi, rdx); // Restore esi.
+
+ __ bind(&return_rax);
+ __ IncrementCounter(&Counters::sub_string_native, 1);
+ __ ret(kArgumentsSize);
+
+ // Just jump to runtime to create the sub string.
+ __ bind(&runtime);
+ __ TailCallRuntime(Runtime::kSubString, 3, 1);
+}
+
+
+void StringCompareStub::GenerateCompareFlatAsciiStrings(MacroAssembler* masm,
+ Register left,
+ Register right,
+ Register scratch1,
+ Register scratch2,
+ Register scratch3,
+ Register scratch4) {
+ // Ensure that you can always subtract a string length from a non-negative
+ // number (e.g. another length).
+ STATIC_ASSERT(String::kMaxLength < 0x7fffffff);
+
+ // Find minimum length and length difference.
+ __ movq(scratch1, FieldOperand(left, String::kLengthOffset));
+ __ movq(scratch4, scratch1);
+ __ SmiSub(scratch4,
+ scratch4,
+ FieldOperand(right, String::kLengthOffset),
+ NULL);
+ // Register scratch4 now holds left.length - right.length.
+ const Register length_difference = scratch4;
+ Label left_shorter;
+ __ j(less, &left_shorter);
+ // The right string isn't longer that the left one.
+ // Get the right string's length by subtracting the (non-negative) difference
+ // from the left string's length.
+ __ SmiSub(scratch1, scratch1, length_difference, NULL);
+ __ bind(&left_shorter);
+ // Register scratch1 now holds Min(left.length, right.length).
+ const Register min_length = scratch1;
+
+ Label compare_lengths;
+ // If min-length is zero, go directly to comparing lengths.
+ __ SmiTest(min_length);
+ __ j(zero, &compare_lengths);
+
+ __ SmiToInteger32(min_length, min_length);
+
+ // Registers scratch2 and scratch3 are free.
+ Label result_not_equal;
+ Label loop;
+ {
+ // Check characters 0 .. min_length - 1 in a loop.
+ // Use scratch3 as loop index, min_length as limit and scratch2
+ // for computation.
+ const Register index = scratch3;
+ __ movl(index, Immediate(0)); // Index into strings.
+ __ bind(&loop);
+ // Compare characters.
+ // TODO(lrn): Could we load more than one character at a time?
+ __ movb(scratch2, FieldOperand(left,
+ index,
+ times_1,
+ SeqAsciiString::kHeaderSize));
+ // Increment index and use -1 modifier on next load to give
+ // the previous load extra time to complete.
+ __ addl(index, Immediate(1));
+ __ cmpb(scratch2, FieldOperand(right,
+ index,
+ times_1,
+ SeqAsciiString::kHeaderSize - 1));
+ __ j(not_equal, &result_not_equal);
+ __ cmpl(index, min_length);
+ __ j(not_equal, &loop);
+ }
+ // Completed loop without finding different characters.
+ // Compare lengths (precomputed).
+ __ bind(&compare_lengths);
+ __ SmiTest(length_difference);
+ __ j(not_zero, &result_not_equal);
+
+ // Result is EQUAL.
+ __ Move(rax, Smi::FromInt(EQUAL));
+ __ ret(0);
+
+ Label result_greater;
+ __ bind(&result_not_equal);
+ // Unequal comparison of left to right, either character or length.
+ __ j(greater, &result_greater);
+
+ // Result is LESS.
+ __ Move(rax, Smi::FromInt(LESS));
+ __ ret(0);
+
+ // Result is GREATER.
+ __ bind(&result_greater);
+ __ Move(rax, Smi::FromInt(GREATER));
+ __ ret(0);
+}
+
+
+void StringCompareStub::Generate(MacroAssembler* masm) {
+ Label runtime;
+
+ // Stack frame on entry.
+ // rsp[0]: return address
+ // rsp[8]: right string
+ // rsp[16]: left string
+
+ __ movq(rdx, Operand(rsp, 2 * kPointerSize)); // left
+ __ movq(rax, Operand(rsp, 1 * kPointerSize)); // right
+
+ // Check for identity.
+ Label not_same;
+ __ cmpq(rdx, rax);
+ __ j(not_equal, ¬_same);
+ __ Move(rax, Smi::FromInt(EQUAL));
+ __ IncrementCounter(&Counters::string_compare_native, 1);
+ __ ret(2 * kPointerSize);
+
+ __ bind(¬_same);
+
+ // Check that both are sequential ASCII strings.
+ __ JumpIfNotBothSequentialAsciiStrings(rdx, rax, rcx, rbx, &runtime);
+
+ // Inline comparison of ascii strings.
+ __ IncrementCounter(&Counters::string_compare_native, 1);
+ // Drop arguments from the stack
+ __ pop(rcx);
+ __ addq(rsp, Immediate(2 * kPointerSize));
+ __ push(rcx);
+ GenerateCompareFlatAsciiStrings(masm, rdx, rax, rcx, rbx, rdi, r8);
+
+ // Call the runtime; it returns -1 (less), 0 (equal), or 1 (greater)
+ // tagged as a small integer.
+ __ bind(&runtime);
+ __ TailCallRuntime(Runtime::kStringCompare, 2, 1);
+}
+
+#undef __
+
+} } // namespace v8::internal
+
+#endif // V8_TARGET_ARCH_X64