ART: Convert pointer size to enum

Move away from size_t to dedicated enum (class).

Bug: 30373134
Bug: 30419309
Test: m test-art-host
Change-Id: Id453c330f1065012e7d4f9fc24ac477cc9bb9269
diff --git a/runtime/Android.mk b/runtime/Android.mk
index 99c4a82..2b06671 100644
--- a/runtime/Android.mk
+++ b/runtime/Android.mk
@@ -342,6 +342,7 @@
 LIBART_ENUM_OPERATOR_OUT_HEADER_FILES := \
   arch/instruction_set.h \
   base/allocator.h \
+  base/enums.h \
   base/mutex.h \
   debugger.h \
   base/unix_file/fd_file.h \
diff --git a/runtime/arch/arm/fault_handler_arm.cc b/runtime/arch/arm/fault_handler_arm.cc
index d105c67..befdd48 100644
--- a/runtime/arch/arm/fault_handler_arm.cc
+++ b/runtime/arch/arm/fault_handler_arm.cc
@@ -20,6 +20,7 @@
 #include <sys/ucontext.h>
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/macros.h"
 #include "base/hex_dump.h"
 #include "globals.h"
@@ -144,7 +145,8 @@
                                void* context) {
   // These are the instructions to check for.  The first one is the ldr r0,[r9,#xxx]
   // where xxx is the offset of the suspend trigger.
-  uint32_t checkinst1 = 0xf8d90000 + Thread::ThreadSuspendTriggerOffset<4>().Int32Value();
+  uint32_t checkinst1 = 0xf8d90000
+      + Thread::ThreadSuspendTriggerOffset<PointerSize::k32>().Int32Value();
   uint16_t checkinst2 = 0x6800;
 
   struct ucontext* uc = reinterpret_cast<struct ucontext*>(context);
diff --git a/runtime/arch/arm/quick_method_frame_info_arm.h b/runtime/arch/arm/quick_method_frame_info_arm.h
index 5580ee4..0fb8a63 100644
--- a/runtime/arch/arm/quick_method_frame_info_arm.h
+++ b/runtime/arch/arm/quick_method_frame_info_arm.h
@@ -63,7 +63,7 @@
 constexpr uint32_t ArmCalleeSaveFrameSize(Runtime::CalleeSaveType type) {
   return RoundUp((POPCOUNT(ArmCalleeSaveCoreSpills(type)) /* gprs */ +
                   POPCOUNT(ArmCalleeSaveFpSpills(type)) /* fprs */ +
-                  1 /* Method* */) * kArmPointerSize, kStackAlignment);
+                  1 /* Method* */) * static_cast<size_t>(kArmPointerSize), kStackAlignment);
 }
 
 constexpr QuickMethodFrameInfo ArmCalleeSaveMethodFrameInfo(Runtime::CalleeSaveType type) {
@@ -75,17 +75,17 @@
 constexpr size_t ArmCalleeSaveFpr1Offset(Runtime::CalleeSaveType type) {
   return ArmCalleeSaveFrameSize(type) -
          (POPCOUNT(ArmCalleeSaveCoreSpills(type)) +
-          POPCOUNT(ArmCalleeSaveFpSpills(type))) * kArmPointerSize;
+          POPCOUNT(ArmCalleeSaveFpSpills(type))) * static_cast<size_t>(kArmPointerSize);
 }
 
 constexpr size_t ArmCalleeSaveGpr1Offset(Runtime::CalleeSaveType type) {
   return ArmCalleeSaveFrameSize(type) -
-         POPCOUNT(ArmCalleeSaveCoreSpills(type)) * kArmPointerSize;
+         POPCOUNT(ArmCalleeSaveCoreSpills(type)) * static_cast<size_t>(kArmPointerSize);
 }
 
 constexpr size_t ArmCalleeSaveLrOffset(Runtime::CalleeSaveType type) {
   return ArmCalleeSaveFrameSize(type) -
-      POPCOUNT(ArmCalleeSaveCoreSpills(type) & (-(1 << LR))) * kArmPointerSize;
+      POPCOUNT(ArmCalleeSaveCoreSpills(type) & (-(1 << LR))) * static_cast<size_t>(kArmPointerSize);
 }
 
 }  // namespace arm
diff --git a/runtime/arch/arm/thread_arm.cc b/runtime/arch/arm/thread_arm.cc
index 2a551a8..ff4f81b 100644
--- a/runtime/arch/arm/thread_arm.cc
+++ b/runtime/arch/arm/thread_arm.cc
@@ -17,15 +17,16 @@
 #include "thread.h"
 
 #include "asm_support_arm.h"
+#include "base/enums.h"
 #include "base/logging.h"
 
 namespace art {
 
 void Thread::InitCpu() {
-  CHECK_EQ(THREAD_FLAGS_OFFSET, ThreadFlagsOffset<4>().Int32Value());
-  CHECK_EQ(THREAD_CARD_TABLE_OFFSET, CardTableOffset<4>().Int32Value());
-  CHECK_EQ(THREAD_EXCEPTION_OFFSET, ExceptionOffset<4>().Int32Value());
-  CHECK_EQ(THREAD_ID_OFFSET, ThinLockIdOffset<4>().Int32Value());
+  CHECK_EQ(THREAD_FLAGS_OFFSET, ThreadFlagsOffset<PointerSize::k32>().Int32Value());
+  CHECK_EQ(THREAD_CARD_TABLE_OFFSET, CardTableOffset<PointerSize::k32>().Int32Value());
+  CHECK_EQ(THREAD_EXCEPTION_OFFSET, ExceptionOffset<PointerSize::k32>().Int32Value());
+  CHECK_EQ(THREAD_ID_OFFSET, ThinLockIdOffset<PointerSize::k32>().Int32Value());
 }
 
 void Thread::CleanupCpu() {
diff --git a/runtime/arch/arm64/fault_handler_arm64.cc b/runtime/arch/arm64/fault_handler_arm64.cc
index f591fcc..6724d6d 100644
--- a/runtime/arch/arm64/fault_handler_arm64.cc
+++ b/runtime/arch/arm64/fault_handler_arm64.cc
@@ -20,6 +20,7 @@
 #include <sys/ucontext.h>
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/macros.h"
 #include "globals.h"
 #include "base/logging.h"
@@ -117,7 +118,8 @@
                                void* context) {
   // These are the instructions to check for.  The first one is the ldr x0,[r18,#xxx]
   // where xxx is the offset of the suspend trigger.
-  uint32_t checkinst1 = 0xf9400240 | (Thread::ThreadSuspendTriggerOffset<8>().Int32Value() << 7);
+  uint32_t checkinst1 = 0xf9400240 |
+      (Thread::ThreadSuspendTriggerOffset<PointerSize::k64>().Int32Value() << 7);
   uint32_t checkinst2 = 0xf9400000;
 
   struct ucontext *uc = reinterpret_cast<struct ucontext *>(context);
diff --git a/runtime/arch/arm64/quick_method_frame_info_arm64.h b/runtime/arch/arm64/quick_method_frame_info_arm64.h
index b525309..b3d250b 100644
--- a/runtime/arch/arm64/quick_method_frame_info_arm64.h
+++ b/runtime/arch/arm64/quick_method_frame_info_arm64.h
@@ -71,7 +71,7 @@
 constexpr uint32_t Arm64CalleeSaveFrameSize(Runtime::CalleeSaveType type) {
   return RoundUp((POPCOUNT(Arm64CalleeSaveCoreSpills(type)) /* gprs */ +
                   POPCOUNT(Arm64CalleeSaveFpSpills(type)) /* fprs */ +
-                  1 /* Method* */) * kArm64PointerSize, kStackAlignment);
+                  1 /* Method* */) * static_cast<size_t>(kArm64PointerSize), kStackAlignment);
 }
 
 constexpr QuickMethodFrameInfo Arm64CalleeSaveMethodFrameInfo(Runtime::CalleeSaveType type) {
@@ -83,17 +83,18 @@
 constexpr size_t Arm64CalleeSaveFpr1Offset(Runtime::CalleeSaveType type) {
   return Arm64CalleeSaveFrameSize(type) -
          (POPCOUNT(Arm64CalleeSaveCoreSpills(type)) +
-          POPCOUNT(Arm64CalleeSaveFpSpills(type))) * kArm64PointerSize;
+          POPCOUNT(Arm64CalleeSaveFpSpills(type))) * static_cast<size_t>(kArm64PointerSize);
 }
 
 constexpr size_t Arm64CalleeSaveGpr1Offset(Runtime::CalleeSaveType type) {
   return Arm64CalleeSaveFrameSize(type) -
-         POPCOUNT(Arm64CalleeSaveCoreSpills(type)) * kArm64PointerSize;
+         POPCOUNT(Arm64CalleeSaveCoreSpills(type)) * static_cast<size_t>(kArm64PointerSize);
 }
 
 constexpr size_t Arm64CalleeSaveLrOffset(Runtime::CalleeSaveType type) {
   return Arm64CalleeSaveFrameSize(type) -
-      POPCOUNT(Arm64CalleeSaveCoreSpills(type) & (-(1 << LR))) * kArm64PointerSize;
+      POPCOUNT(Arm64CalleeSaveCoreSpills(type) & (-(1 << LR))) *
+      static_cast<size_t>(kArm64PointerSize);
 }
 
 }  // namespace arm64
diff --git a/runtime/arch/arm64/thread_arm64.cc b/runtime/arch/arm64/thread_arm64.cc
index 564dced..3483b70 100644
--- a/runtime/arch/arm64/thread_arm64.cc
+++ b/runtime/arch/arm64/thread_arm64.cc
@@ -17,15 +17,16 @@
 #include "thread.h"
 
 #include "asm_support_arm64.h"
+#include "base/enums.h"
 #include "base/logging.h"
 
 namespace art {
 
 void Thread::InitCpu() {
-  CHECK_EQ(THREAD_FLAGS_OFFSET, ThreadFlagsOffset<8>().Int32Value());
-  CHECK_EQ(THREAD_CARD_TABLE_OFFSET, CardTableOffset<8>().Int32Value());
-  CHECK_EQ(THREAD_EXCEPTION_OFFSET, ExceptionOffset<8>().Int32Value());
-  CHECK_EQ(THREAD_ID_OFFSET, ThinLockIdOffset<8>().Int32Value());
+  CHECK_EQ(THREAD_FLAGS_OFFSET, ThreadFlagsOffset<PointerSize::k64>().Int32Value());
+  CHECK_EQ(THREAD_CARD_TABLE_OFFSET, CardTableOffset<PointerSize::k64>().Int32Value());
+  CHECK_EQ(THREAD_EXCEPTION_OFFSET, ExceptionOffset<PointerSize::k64>().Int32Value());
+  CHECK_EQ(THREAD_ID_OFFSET, ThinLockIdOffset<PointerSize::k64>().Int32Value());
 }
 
 void Thread::CleanupCpu() {
diff --git a/runtime/arch/instruction_set.h b/runtime/arch/instruction_set.h
index ff9c0b3..917acc9 100644
--- a/runtime/arch/instruction_set.h
+++ b/runtime/arch/instruction_set.h
@@ -20,6 +20,7 @@
 #include <iosfwd>
 #include <string>
 
+#include "base/enums.h"
 #include "base/logging.h"  // Logging is required for FATAL in the helper functions.
 
 namespace art {
@@ -53,12 +54,12 @@
 #endif
 
 // Architecture-specific pointer sizes
-static constexpr size_t kArmPointerSize = 4;
-static constexpr size_t kArm64PointerSize = 8;
-static constexpr size_t kMipsPointerSize = 4;
-static constexpr size_t kMips64PointerSize = 8;
-static constexpr size_t kX86PointerSize = 4;
-static constexpr size_t kX86_64PointerSize = 8;
+static constexpr PointerSize kArmPointerSize = PointerSize::k32;
+static constexpr PointerSize kArm64PointerSize = PointerSize::k64;
+static constexpr PointerSize kMipsPointerSize = PointerSize::k32;
+static constexpr PointerSize kMips64PointerSize = PointerSize::k64;
+static constexpr PointerSize kX86PointerSize = PointerSize::k32;
+static constexpr PointerSize kX86_64PointerSize = PointerSize::k64;
 
 // ARM instruction alignment. ARM processors require code to be 4-byte aligned,
 // but ARM ELF requires 8..
@@ -82,7 +83,7 @@
 
 InstructionSet GetInstructionSetFromELF(uint16_t e_machine, uint32_t e_flags);
 
-static inline size_t GetInstructionSetPointerSize(InstructionSet isa) {
+static inline PointerSize GetInstructionSetPointerSize(InstructionSet isa) {
   switch (isa) {
     case kArm:
       // Fall-through.
@@ -147,8 +148,8 @@
   }
 }
 
-static inline size_t InstructionSetPointerSize(InstructionSet isa) {
-  return Is64BitInstructionSet(isa) ? 8U : 4U;
+static inline PointerSize InstructionSetPointerSize(InstructionSet isa) {
+  return Is64BitInstructionSet(isa) ? PointerSize::k64 : PointerSize::k32;
 }
 
 static inline size_t GetBytesPerGprSpillLocation(InstructionSet isa) {
diff --git a/runtime/arch/instruction_set_test.cc b/runtime/arch/instruction_set_test.cc
index 2f3cf18..5dfc4b4 100644
--- a/runtime/arch/instruction_set_test.cc
+++ b/runtime/arch/instruction_set_test.cc
@@ -18,6 +18,7 @@
 
 #include <gtest/gtest.h>
 
+#include "base/enums.h"
 #include "base/stringprintf.h"
 
 namespace art {
@@ -49,7 +50,7 @@
 }
 
 TEST(InstructionSetTest, PointerSize) {
-  EXPECT_EQ(sizeof(void*), GetInstructionSetPointerSize(kRuntimeISA));
+  EXPECT_EQ(kRuntimePointerSize, GetInstructionSetPointerSize(kRuntimeISA));
 }
 
 }  // namespace art
diff --git a/runtime/arch/mips/quick_method_frame_info_mips.h b/runtime/arch/mips/quick_method_frame_info_mips.h
index f5d13c2..7b0623b 100644
--- a/runtime/arch/mips/quick_method_frame_info_mips.h
+++ b/runtime/arch/mips/quick_method_frame_info_mips.h
@@ -59,7 +59,7 @@
 constexpr uint32_t MipsCalleeSaveFrameSize(Runtime::CalleeSaveType type) {
   return RoundUp((POPCOUNT(MipsCalleeSaveCoreSpills(type)) /* gprs */ +
                   POPCOUNT(MipsCalleeSaveFPSpills(type))   /* fprs */ +
-                  1 /* Method* */) * kMipsPointerSize, kStackAlignment);
+                  1 /* Method* */) * static_cast<size_t>(kMipsPointerSize), kStackAlignment);
 }
 
 constexpr QuickMethodFrameInfo MipsCalleeSaveMethodFrameInfo(Runtime::CalleeSaveType type) {
diff --git a/runtime/arch/mips/thread_mips.cc b/runtime/arch/mips/thread_mips.cc
index a451496..06d6211 100644
--- a/runtime/arch/mips/thread_mips.cc
+++ b/runtime/arch/mips/thread_mips.cc
@@ -17,14 +17,15 @@
 #include "thread.h"
 
 #include "asm_support_mips.h"
+#include "base/enums.h"
 #include "base/logging.h"
 
 namespace art {
 
 void Thread::InitCpu() {
-  CHECK_EQ(THREAD_FLAGS_OFFSET, ThreadFlagsOffset<4>().Int32Value());
-  CHECK_EQ(THREAD_CARD_TABLE_OFFSET, CardTableOffset<4>().Int32Value());
-  CHECK_EQ(THREAD_EXCEPTION_OFFSET, ExceptionOffset<4>().Int32Value());
+  CHECK_EQ(THREAD_FLAGS_OFFSET, ThreadFlagsOffset<PointerSize::k32>().Int32Value());
+  CHECK_EQ(THREAD_CARD_TABLE_OFFSET, CardTableOffset<PointerSize::k32>().Int32Value());
+  CHECK_EQ(THREAD_EXCEPTION_OFFSET, ExceptionOffset<PointerSize::k64>().Int32Value());
 }
 
 void Thread::CleanupCpu() {
diff --git a/runtime/arch/mips64/quick_method_frame_info_mips64.h b/runtime/arch/mips64/quick_method_frame_info_mips64.h
index f967be0..b7dc57f 100644
--- a/runtime/arch/mips64/quick_method_frame_info_mips64.h
+++ b/runtime/arch/mips64/quick_method_frame_info_mips64.h
@@ -62,7 +62,7 @@
 constexpr uint32_t Mips64CalleeSaveFrameSize(Runtime::CalleeSaveType type) {
   return RoundUp((POPCOUNT(Mips64CalleeSaveCoreSpills(type)) /* gprs */ +
                   POPCOUNT(Mips64CalleeSaveFpSpills(type))   /* fprs */ +
-                  + 1 /* Method* */) * kMips64PointerSize, kStackAlignment);
+                  + 1 /* Method* */) * static_cast<size_t>(kMips64PointerSize), kStackAlignment);
 }
 
 constexpr QuickMethodFrameInfo Mips64CalleeSaveMethodFrameInfo(Runtime::CalleeSaveType type) {
diff --git a/runtime/arch/mips64/thread_mips64.cc b/runtime/arch/mips64/thread_mips64.cc
index c55537c..3ce5e50 100644
--- a/runtime/arch/mips64/thread_mips64.cc
+++ b/runtime/arch/mips64/thread_mips64.cc
@@ -17,14 +17,15 @@
 #include "thread.h"
 
 #include "asm_support_mips64.h"
+#include "base/enums.h"
 #include "base/logging.h"
 
 namespace art {
 
 void Thread::InitCpu() {
-  CHECK_EQ(THREAD_FLAGS_OFFSET, ThreadFlagsOffset<8>().Int32Value());
-  CHECK_EQ(THREAD_CARD_TABLE_OFFSET, CardTableOffset<8>().Int32Value());
-  CHECK_EQ(THREAD_EXCEPTION_OFFSET, ExceptionOffset<8>().Int32Value());
+  CHECK_EQ(THREAD_FLAGS_OFFSET, ThreadFlagsOffset<PointerSize::k64>().Int32Value());
+  CHECK_EQ(THREAD_CARD_TABLE_OFFSET, CardTableOffset<PointerSize::k64>().Int32Value());
+  CHECK_EQ(THREAD_EXCEPTION_OFFSET, ExceptionOffset<PointerSize::k64>().Int32Value());
 }
 
 void Thread::CleanupCpu() {
diff --git a/runtime/arch/stub_test.cc b/runtime/arch/stub_test.cc
index 09af373..80bb51d 100644
--- a/runtime/arch/stub_test.cc
+++ b/runtime/arch/stub_test.cc
@@ -18,6 +18,7 @@
 
 #include "art_field-inl.h"
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "class_linker-inl.h"
 #include "common_runtime_test.h"
 #include "entrypoints/quick/quick_entrypoints_enum.h"
@@ -529,11 +530,7 @@
 
   static uintptr_t GetEntrypoint(Thread* self, QuickEntrypointEnum entrypoint) {
     int32_t offset;
-#ifdef __LP64__
-    offset = GetThreadOffset<8>(entrypoint).Int32Value();
-#else
-    offset = GetThreadOffset<4>(entrypoint).Int32Value();
-#endif
+    offset = GetThreadOffset<kRuntimePointerSize>(entrypoint).Int32Value();
     return *reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(self) + offset);
   }
 
@@ -1016,7 +1013,7 @@
     // Use an arbitrary method from c to use as referrer
     size_t result = Invoke3(static_cast<size_t>(c->GetDexTypeIndex()),    // type_idx
                             // arbitrary
-                            reinterpret_cast<size_t>(c->GetVirtualMethod(0, sizeof(void*))),
+                            reinterpret_cast<size_t>(c->GetVirtualMethod(0, kRuntimePointerSize)),
                             0U,
                             StubTest::GetEntrypoint(self, kQuickAllocObject),
                             self);
@@ -1147,12 +1144,13 @@
 
   if ((false)) {
     // Use an arbitrary method from c to use as referrer
-    size_t result = Invoke3(static_cast<size_t>(c->GetDexTypeIndex()),    // type_idx
-                            10U,
-                            // arbitrary
-                            reinterpret_cast<size_t>(c_obj->GetVirtualMethod(0, sizeof(void*))),
-                            StubTest::GetEntrypoint(self, kQuickAllocArray),
-                            self);
+    size_t result = Invoke3(
+        static_cast<size_t>(c->GetDexTypeIndex()),    // type_idx
+        10U,
+        // arbitrary
+        reinterpret_cast<size_t>(c_obj->GetVirtualMethod(0, kRuntimePointerSize)),
+        StubTest::GetEntrypoint(self, kQuickAllocArray),
+        self);
 
     EXPECT_FALSE(self->IsExceptionPending());
     EXPECT_NE(reinterpret_cast<size_t>(nullptr), result);
@@ -1799,7 +1797,7 @@
   Handle<mirror::Object> obj(hs.NewHandle(soa.Decode<mirror::Object*>(o)));
   Handle<mirror::Class> c(hs.NewHandle(obj->GetClass()));
   // Need a method as a referrer
-  ArtMethod* m = c->GetDirectMethod(0, sizeof(void*));
+  ArtMethod* m = c->GetDirectMethod(0, kRuntimePointerSize);
 
   // Play with it...
 
@@ -2015,10 +2013,10 @@
       Runtime::Current()->GetClassLinker()->CreateImtConflictTable(/*count*/0u, linear_alloc);
   void* data = linear_alloc->Alloc(
       self,
-      ImtConflictTable::ComputeSizeWithOneMoreEntry(empty_conflict_table, sizeof(void*)));
+      ImtConflictTable::ComputeSizeWithOneMoreEntry(empty_conflict_table, kRuntimePointerSize));
   ImtConflictTable* new_table = new (data) ImtConflictTable(
-      empty_conflict_table, inf_contains, contains_amethod, sizeof(void*));
-  conflict_method->SetImtConflictTable(new_table, sizeof(void*));
+      empty_conflict_table, inf_contains, contains_amethod, kRuntimePointerSize);
+  conflict_method->SetImtConflictTable(new_table, kRuntimePointerSize);
 
   size_t result =
       Invoke3WithReferrerAndHidden(reinterpret_cast<size_t>(conflict_method),
diff --git a/runtime/arch/x86/fault_handler_x86.cc b/runtime/arch/x86/fault_handler_x86.cc
index 24e3a0d..533905e 100644
--- a/runtime/arch/x86/fault_handler_x86.cc
+++ b/runtime/arch/x86/fault_handler_x86.cc
@@ -20,6 +20,7 @@
 #include <sys/ucontext.h>
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/macros.h"
 #include "globals.h"
 #include "base/logging.h"
@@ -347,11 +348,7 @@
 bool SuspensionHandler::Action(int, siginfo_t*, void* context) {
   // These are the instructions to check for.  The first one is the mov eax, fs:[xxx]
   // where xxx is the offset of the suspend trigger.
-#if defined(__x86_64__)
-  uint32_t trigger = Thread::ThreadSuspendTriggerOffset<8>().Int32Value();
-#else
-  uint32_t trigger = Thread::ThreadSuspendTriggerOffset<4>().Int32Value();
-#endif
+  uint32_t trigger = Thread::ThreadSuspendTriggerOffset<kRuntimePointerSize>().Int32Value();
 
   VLOG(signals) << "Checking for suspension point";
 #if defined(__x86_64__)
diff --git a/runtime/arch/x86/quick_method_frame_info_x86.h b/runtime/arch/x86/quick_method_frame_info_x86.h
index ed1d860..24c671c 100644
--- a/runtime/arch/x86/quick_method_frame_info_x86.h
+++ b/runtime/arch/x86/quick_method_frame_info_x86.h
@@ -56,7 +56,7 @@
 constexpr uint32_t X86CalleeSaveFrameSize(Runtime::CalleeSaveType type) {
   return RoundUp((POPCOUNT(X86CalleeSaveCoreSpills(type)) /* gprs */ +
                   2 * POPCOUNT(X86CalleeSaveFpSpills(type)) /* fprs */ +
-                  1 /* Method* */) * kX86PointerSize, kStackAlignment);
+                  1 /* Method* */) * static_cast<size_t>(kX86PointerSize), kStackAlignment);
 }
 
 constexpr QuickMethodFrameInfo X86CalleeSaveMethodFrameInfo(Runtime::CalleeSaveType type) {
diff --git a/runtime/arch/x86/thread_x86.cc b/runtime/arch/x86/thread_x86.cc
index c39d122..241650e 100644
--- a/runtime/arch/x86/thread_x86.cc
+++ b/runtime/arch/x86/thread_x86.cc
@@ -20,6 +20,7 @@
 #include <sys/types.h>
 
 #include "asm_support_x86.h"
+#include "base/enums.h"
 #include "base/macros.h"
 #include "thread-inl.h"
 #include "thread_list.h"
@@ -136,7 +137,7 @@
 
   // Sanity check that reads from %fs point to this Thread*.
   Thread* self_check;
-  CHECK_EQ(THREAD_SELF_OFFSET, SelfOffset<4>().Int32Value());
+  CHECK_EQ(THREAD_SELF_OFFSET, SelfOffset<PointerSize::k32>().Int32Value());
   __asm__ __volatile__("movl %%fs:(%1), %0"
       : "=r"(self_check)  // output
       : "r"(THREAD_SELF_OFFSET)  // input
@@ -144,9 +145,9 @@
   CHECK_EQ(self_check, this);
 
   // Sanity check other offsets.
-  CHECK_EQ(THREAD_EXCEPTION_OFFSET, ExceptionOffset<4>().Int32Value());
-  CHECK_EQ(THREAD_CARD_TABLE_OFFSET, CardTableOffset<4>().Int32Value());
-  CHECK_EQ(THREAD_ID_OFFSET, ThinLockIdOffset<4>().Int32Value());
+  CHECK_EQ(THREAD_EXCEPTION_OFFSET, ExceptionOffset<PointerSize::k32>().Int32Value());
+  CHECK_EQ(THREAD_CARD_TABLE_OFFSET, CardTableOffset<PointerSize::k32>().Int32Value());
+  CHECK_EQ(THREAD_ID_OFFSET, ThinLockIdOffset<PointerSize::k32>().Int32Value());
 }
 
 void Thread::CleanupCpu() {
diff --git a/runtime/arch/x86_64/quick_method_frame_info_x86_64.h b/runtime/arch/x86_64/quick_method_frame_info_x86_64.h
index 72d7e99..37eff83 100644
--- a/runtime/arch/x86_64/quick_method_frame_info_x86_64.h
+++ b/runtime/arch/x86_64/quick_method_frame_info_x86_64.h
@@ -53,7 +53,7 @@
 constexpr uint32_t X86_64CalleeSaveFrameSize(Runtime::CalleeSaveType type) {
   return RoundUp((POPCOUNT(X86_64CalleeSaveCoreSpills(type)) /* gprs */ +
                   POPCOUNT(X86_64CalleeSaveFpSpills(type)) /* fprs */ +
-                  1 /* Method* */) * kX86_64PointerSize, kStackAlignment);
+                  1 /* Method* */) * static_cast<size_t>(kX86_64PointerSize), kStackAlignment);
 }
 
 constexpr QuickMethodFrameInfo X86_64CalleeSaveMethodFrameInfo(Runtime::CalleeSaveType type) {
diff --git a/runtime/art_method-inl.h b/runtime/art_method-inl.h
index 70a907f..2421246 100644
--- a/runtime/art_method-inl.h
+++ b/runtime/art_method-inl.h
@@ -126,20 +126,21 @@
   return GetDexMethodIndex() % ImTable::kSize;
 }
 
-inline ArtMethod** ArtMethod::GetDexCacheResolvedMethods(size_t pointer_size) {
+inline ArtMethod** ArtMethod::GetDexCacheResolvedMethods(PointerSize pointer_size) {
   return GetNativePointer<ArtMethod**>(DexCacheResolvedMethodsOffset(pointer_size),
                                        pointer_size);
 }
 
-inline ArtMethod* ArtMethod::GetDexCacheResolvedMethod(uint16_t method_index, size_t ptr_size) {
+inline ArtMethod* ArtMethod::GetDexCacheResolvedMethod(uint16_t method_index,
+                                                       PointerSize pointer_size) {
   // NOTE: Unchecked, i.e. not throwing AIOOB. We don't even know the length here
   // without accessing the DexCache and we don't want to do that in release build.
   DCHECK_LT(method_index,
-            GetInterfaceMethodIfProxy(ptr_size)->GetDeclaringClass()
+            GetInterfaceMethodIfProxy(pointer_size)->GetDeclaringClass()
                 ->GetDexCache()->NumResolvedMethods());
-  ArtMethod* method = mirror::DexCache::GetElementPtrSize(GetDexCacheResolvedMethods(ptr_size),
+  ArtMethod* method = mirror::DexCache::GetElementPtrSize(GetDexCacheResolvedMethods(pointer_size),
                                                           method_index,
-                                                          ptr_size);
+                                                          pointer_size);
   if (LIKELY(method != nullptr)) {
     auto* declaring_class = method->GetDeclaringClass();
     if (LIKELY(declaring_class == nullptr || !declaring_class->IsErroneous())) {
@@ -149,70 +150,72 @@
   return nullptr;
 }
 
-inline void ArtMethod::SetDexCacheResolvedMethod(uint16_t method_index, ArtMethod* new_method,
-                                                 size_t ptr_size) {
+inline void ArtMethod::SetDexCacheResolvedMethod(uint16_t method_index,
+                                                 ArtMethod* new_method,
+                                                 PointerSize pointer_size) {
   // NOTE: Unchecked, i.e. not throwing AIOOB. We don't even know the length here
   // without accessing the DexCache and we don't want to do that in release build.
   DCHECK_LT(method_index,
-            GetInterfaceMethodIfProxy(ptr_size)->GetDeclaringClass()
+            GetInterfaceMethodIfProxy(pointer_size)->GetDeclaringClass()
                 ->GetDexCache()->NumResolvedMethods());
   DCHECK(new_method == nullptr || new_method->GetDeclaringClass() != nullptr);
-  mirror::DexCache::SetElementPtrSize(GetDexCacheResolvedMethods(ptr_size),
+  mirror::DexCache::SetElementPtrSize(GetDexCacheResolvedMethods(pointer_size),
                                       method_index,
                                       new_method,
-                                      ptr_size);
+                                      pointer_size);
 }
 
-inline bool ArtMethod::HasDexCacheResolvedMethods(size_t pointer_size) {
+inline bool ArtMethod::HasDexCacheResolvedMethods(PointerSize pointer_size) {
   return GetDexCacheResolvedMethods(pointer_size) != nullptr;
 }
 
 inline bool ArtMethod::HasSameDexCacheResolvedMethods(ArtMethod** other_cache,
-                                                      size_t pointer_size) {
+                                                      PointerSize pointer_size) {
   return GetDexCacheResolvedMethods(pointer_size) == other_cache;
 }
 
-inline bool ArtMethod::HasSameDexCacheResolvedMethods(ArtMethod* other, size_t pointer_size) {
+inline bool ArtMethod::HasSameDexCacheResolvedMethods(ArtMethod* other, PointerSize pointer_size) {
   return GetDexCacheResolvedMethods(pointer_size) ==
       other->GetDexCacheResolvedMethods(pointer_size);
 }
 
-inline GcRoot<mirror::Class>* ArtMethod::GetDexCacheResolvedTypes(size_t pointer_size) {
+inline GcRoot<mirror::Class>* ArtMethod::GetDexCacheResolvedTypes(PointerSize pointer_size) {
   return GetNativePointer<GcRoot<mirror::Class>*>(DexCacheResolvedTypesOffset(pointer_size),
                                                   pointer_size);
 }
 
 template <bool kWithCheck>
-inline mirror::Class* ArtMethod::GetDexCacheResolvedType(uint32_t type_index, size_t ptr_size) {
+inline mirror::Class* ArtMethod::GetDexCacheResolvedType(uint32_t type_index,
+                                                         PointerSize pointer_size) {
   if (kWithCheck) {
     mirror::DexCache* dex_cache =
-        GetInterfaceMethodIfProxy(ptr_size)->GetDeclaringClass()->GetDexCache();
+        GetInterfaceMethodIfProxy(pointer_size)->GetDeclaringClass()->GetDexCache();
     if (UNLIKELY(type_index >= dex_cache->NumResolvedTypes())) {
       ThrowArrayIndexOutOfBoundsException(type_index, dex_cache->NumResolvedTypes());
       return nullptr;
     }
   }
-  mirror::Class* klass = GetDexCacheResolvedTypes(ptr_size)[type_index].Read();
+  mirror::Class* klass = GetDexCacheResolvedTypes(pointer_size)[type_index].Read();
   return (klass != nullptr && !klass->IsErroneous()) ? klass : nullptr;
 }
 
-inline bool ArtMethod::HasDexCacheResolvedTypes(size_t pointer_size) {
+inline bool ArtMethod::HasDexCacheResolvedTypes(PointerSize pointer_size) {
   return GetDexCacheResolvedTypes(pointer_size) != nullptr;
 }
 
 inline bool ArtMethod::HasSameDexCacheResolvedTypes(GcRoot<mirror::Class>* other_cache,
-                                                    size_t pointer_size) {
+                                                    PointerSize pointer_size) {
   return GetDexCacheResolvedTypes(pointer_size) == other_cache;
 }
 
-inline bool ArtMethod::HasSameDexCacheResolvedTypes(ArtMethod* other, size_t pointer_size) {
+inline bool ArtMethod::HasSameDexCacheResolvedTypes(ArtMethod* other, PointerSize pointer_size) {
   return GetDexCacheResolvedTypes(pointer_size) == other->GetDexCacheResolvedTypes(pointer_size);
 }
 
 inline mirror::Class* ArtMethod::GetClassFromTypeIndex(uint16_t type_idx,
                                                        bool resolve,
-                                                       size_t ptr_size) {
-  mirror::Class* type = GetDexCacheResolvedType(type_idx, ptr_size);
+                                                       PointerSize pointer_size) {
+  mirror::Class* type = GetDexCacheResolvedType(type_idx, pointer_size);
   if (type == nullptr && resolve) {
     type = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, this);
     CHECK(type != nullptr || Thread::Current()->IsExceptionPending());
@@ -334,9 +337,9 @@
   return GetDeclaringClass()->GetDexFile().GetCodeItem(GetCodeItemOffset());
 }
 
-inline bool ArtMethod::IsResolvedTypeIdx(uint16_t type_idx, size_t ptr_size) {
+inline bool ArtMethod::IsResolvedTypeIdx(uint16_t type_idx, PointerSize pointer_size) {
   DCHECK(!IsProxyMethod());
-  return GetDexCacheResolvedType(type_idx, ptr_size) != nullptr;
+  return GetDexCacheResolvedType(type_idx, pointer_size) != nullptr;
 }
 
 inline int32_t ArtMethod::GetLineNumFromDexPC(uint32_t dex_pc) {
@@ -406,7 +409,7 @@
   return GetDeclaringClass<kReadBarrierOption>()->IsProxyClass();
 }
 
-inline ArtMethod* ArtMethod::GetInterfaceMethodIfProxy(size_t pointer_size) {
+inline ArtMethod* ArtMethod::GetInterfaceMethodIfProxy(PointerSize pointer_size) {
   if (LIKELY(!IsProxyMethod())) {
     return this;
   }
@@ -422,22 +425,24 @@
 }
 
 inline void ArtMethod::SetDexCacheResolvedMethods(ArtMethod** new_dex_cache_methods,
-                                                  size_t ptr_size) {
-  SetNativePointer(DexCacheResolvedMethodsOffset(ptr_size), new_dex_cache_methods, ptr_size);
+                                                  PointerSize pointer_size) {
+  SetNativePointer(DexCacheResolvedMethodsOffset(pointer_size),
+                   new_dex_cache_methods,
+                   pointer_size);
 }
 
 inline void ArtMethod::SetDexCacheResolvedTypes(GcRoot<mirror::Class>* new_dex_cache_types,
-                                                size_t ptr_size) {
-  SetNativePointer(DexCacheResolvedTypesOffset(ptr_size), new_dex_cache_types, ptr_size);
+                                                PointerSize pointer_size) {
+  SetNativePointer(DexCacheResolvedTypesOffset(pointer_size), new_dex_cache_types, pointer_size);
 }
 
-inline mirror::Class* ArtMethod::GetReturnType(bool resolve, size_t ptr_size) {
+inline mirror::Class* ArtMethod::GetReturnType(bool resolve, PointerSize pointer_size) {
   DCHECK(!IsProxyMethod());
   const DexFile* dex_file = GetDexFile();
   const DexFile::MethodId& method_id = dex_file->GetMethodId(GetDexMethodIndex());
   const DexFile::ProtoId& proto_id = dex_file->GetMethodPrototype(method_id);
   uint16_t return_type_idx = proto_id.return_type_idx_;
-  mirror::Class* type = GetDexCacheResolvedType(return_type_idx, ptr_size);
+  mirror::Class* type = GetDexCacheResolvedType(return_type_idx, pointer_size);
   if (type == nullptr && resolve) {
     type = Runtime::Current()->GetClassLinker()->ResolveType(return_type_idx, this);
     CHECK(type != nullptr || Thread::Current()->IsExceptionPending());
@@ -446,7 +451,7 @@
 }
 
 template<ReadBarrierOption kReadBarrierOption, typename RootVisitorType>
-void ArtMethod::VisitRoots(RootVisitorType& visitor, size_t pointer_size) {
+void ArtMethod::VisitRoots(RootVisitorType& visitor, PointerSize pointer_size) {
   if (LIKELY(!declaring_class_.IsNull())) {
     visitor.VisitRoot(declaring_class_.AddressWithoutBarrier());
     mirror::Class* klass = declaring_class_.Read<kReadBarrierOption>();
@@ -482,7 +487,7 @@
 
 template <typename Visitor>
 inline void ArtMethod::UpdateObjectsForImageRelocation(const Visitor& visitor,
-                                                       size_t pointer_size) {
+                                                       PointerSize pointer_size) {
   mirror::Class* old_class = GetDeclaringClassUnchecked<kWithoutReadBarrier>();
   mirror::Class* new_class = visitor(old_class);
   if (old_class != new_class) {
@@ -501,7 +506,7 @@
 }
 
 template <ReadBarrierOption kReadBarrierOption, typename Visitor>
-inline void ArtMethod::UpdateEntrypoints(const Visitor& visitor, size_t pointer_size) {
+inline void ArtMethod::UpdateEntrypoints(const Visitor& visitor, PointerSize pointer_size) {
   if (IsNative<kReadBarrierOption>()) {
     const void* old_native_code = GetEntryPointFromJniPtrSize(pointer_size);
     const void* new_native_code = visitor(old_native_code);
diff --git a/runtime/art_method.cc b/runtime/art_method.cc
index 113827a..60975d4 100644
--- a/runtime/art_method.cc
+++ b/runtime/art_method.cc
@@ -122,7 +122,7 @@
   return dex_file->GetMethodSignature(mid) == dex_file2->GetMethodSignature(mid2);
 }
 
-ArtMethod* ArtMethod::FindOverriddenMethod(size_t pointer_size) {
+ArtMethod* ArtMethod::FindOverriddenMethod(PointerSize pointer_size) {
   if (IsStatic()) {
     return nullptr;
   }
@@ -196,7 +196,7 @@
   // Default to handler not found.
   uint32_t found_dex_pc = DexFile::kDexNoIndex;
   // Iterate over the catch handlers associated with dex_pc.
-  size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+  PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
   for (CatchHandlerIterator it(*code_item, dex_pc); it.HasNext(); it.Next()) {
     uint16_t iter_type_idx = it.GetHandlerTypeIndex();
     // Catch all case
@@ -245,7 +245,7 @@
   if (kIsDebugBuild) {
     self->AssertThreadSuspensionIsAllowable();
     CHECK_EQ(kRunnable, self->GetState());
-    CHECK_STREQ(GetInterfaceMethodIfProxy(sizeof(void*))->GetShorty(), shorty);
+    CHECK_STREQ(GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty(), shorty);
   }
 
   // Push a transition back into managed code onto the linked list in thread.
@@ -268,7 +268,7 @@
           self, this, receiver, args + 1, result, /*stay_in_interpreter*/ true);
     }
   } else {
-    DCHECK_EQ(runtime->GetClassLinker()->GetImagePointerSize(), sizeof(void*));
+    DCHECK_EQ(runtime->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
 
     constexpr bool kLogInvocationStartAndReturn = false;
     bool have_quick_code = GetEntryPointFromQuickCompiledCode() != nullptr;
@@ -476,7 +476,7 @@
   return Runtime::Current()->GetClassLinker()->GetOatMethodQuickCodeFor(this) != nullptr;
 }
 
-void ArtMethod::CopyFrom(ArtMethod* src, size_t image_pointer_size) {
+void ArtMethod::CopyFrom(ArtMethod* src, PointerSize image_pointer_size) {
   memcpy(reinterpret_cast<void*>(this), reinterpret_cast<const void*>(src),
          Size(image_pointer_size));
   declaring_class_ = GcRoot<mirror::Class>(const_cast<ArtMethod*>(src)->GetDeclaringClass());
@@ -499,18 +499,20 @@
   hotness_count_ = 0;
 }
 
-bool ArtMethod::IsImagePointerSize(size_t pointer_size) {
+bool ArtMethod::IsImagePointerSize(PointerSize pointer_size) {
   // Hijack this function to get access to PtrSizedFieldsOffset.
   //
   // Ensure that PrtSizedFieldsOffset is correct. We rely here on usually having both 32-bit and
   // 64-bit builds.
   static_assert(std::is_standard_layout<ArtMethod>::value, "ArtMethod is not standard layout.");
-  static_assert((sizeof(void*) != 4) ||
-                    (offsetof(ArtMethod, ptr_sized_fields_) == PtrSizedFieldsOffset(4)),
-                "Unexpected 32-bit class layout.");
-  static_assert((sizeof(void*) != 8) ||
-                    (offsetof(ArtMethod, ptr_sized_fields_) == PtrSizedFieldsOffset(8)),
-                "Unexpected 64-bit class layout.");
+  static_assert(
+      (sizeof(void*) != 4) ||
+          (offsetof(ArtMethod, ptr_sized_fields_) == PtrSizedFieldsOffset(PointerSize::k32)),
+      "Unexpected 32-bit class layout.");
+  static_assert(
+      (sizeof(void*) != 8) ||
+          (offsetof(ArtMethod, ptr_sized_fields_) == PtrSizedFieldsOffset(PointerSize::k64)),
+      "Unexpected 64-bit class layout.");
 
   Runtime* runtime = Runtime::Current();
   if (runtime == nullptr) {
diff --git a/runtime/art_method.h b/runtime/art_method.h
index 1d14203..acf06fd 100644
--- a/runtime/art_method.h
+++ b/runtime/art_method.h
@@ -21,6 +21,7 @@
 
 #include "base/bit_utils.h"
 #include "base/casts.h"
+#include "base/enums.h"
 #include "dex_file.h"
 #include "gc_root.h"
 #include "invoke_type.h"
@@ -65,7 +66,7 @@
   ImtConflictTable(ImtConflictTable* other,
                    ArtMethod* interface_method,
                    ArtMethod* implementation_method,
-                   size_t pointer_size) {
+                   PointerSize pointer_size) {
     const size_t count = other->NumEntries(pointer_size);
     for (size_t i = 0; i < count; ++i) {
       SetInterfaceMethod(i, pointer_size, other->GetInterfaceMethod(i, pointer_size));
@@ -79,30 +80,30 @@
   }
 
   // num_entries excludes the header.
-  ImtConflictTable(size_t num_entries, size_t pointer_size) {
+  ImtConflictTable(size_t num_entries, PointerSize pointer_size) {
     SetInterfaceMethod(num_entries, pointer_size, nullptr);
     SetImplementationMethod(num_entries, pointer_size, nullptr);
   }
 
   // Set an entry at an index.
-  void SetInterfaceMethod(size_t index, size_t pointer_size, ArtMethod* method) {
+  void SetInterfaceMethod(size_t index, PointerSize pointer_size, ArtMethod* method) {
     SetMethod(index * kMethodCount + kMethodInterface, pointer_size, method);
   }
 
-  void SetImplementationMethod(size_t index, size_t pointer_size, ArtMethod* method) {
+  void SetImplementationMethod(size_t index, PointerSize pointer_size, ArtMethod* method) {
     SetMethod(index * kMethodCount + kMethodImplementation, pointer_size, method);
   }
 
-  ArtMethod* GetInterfaceMethod(size_t index, size_t pointer_size) const {
+  ArtMethod* GetInterfaceMethod(size_t index, PointerSize pointer_size) const {
     return GetMethod(index * kMethodCount + kMethodInterface, pointer_size);
   }
 
-  ArtMethod* GetImplementationMethod(size_t index, size_t pointer_size) const {
+  ArtMethod* GetImplementationMethod(size_t index, PointerSize pointer_size) const {
     return GetMethod(index * kMethodCount + kMethodImplementation, pointer_size);
   }
 
   // Return true if two conflict tables are the same.
-  bool Equals(ImtConflictTable* other, size_t pointer_size) const {
+  bool Equals(ImtConflictTable* other, PointerSize pointer_size) const {
     size_t num = NumEntries(pointer_size);
     if (num != other->NumEntries(pointer_size)) {
       return false;
@@ -121,7 +122,7 @@
   // NO_THREAD_SAFETY_ANALYSIS for calling with held locks. Visitor is passed a pair of ArtMethod*
   // and also returns one. The order is <interface, implementation>.
   template<typename Visitor>
-  void Visit(const Visitor& visitor, size_t pointer_size) NO_THREAD_SAFETY_ANALYSIS {
+  void Visit(const Visitor& visitor, PointerSize pointer_size) NO_THREAD_SAFETY_ANALYSIS {
     uint32_t table_index = 0;
     for (;;) {
       ArtMethod* interface_method = GetInterfaceMethod(table_index, pointer_size);
@@ -143,7 +144,7 @@
 
   // Lookup the implementation ArtMethod associated to `interface_method`. Return null
   // if not found.
-  ArtMethod* Lookup(ArtMethod* interface_method, size_t pointer_size) const {
+  ArtMethod* Lookup(ArtMethod* interface_method, PointerSize pointer_size) const {
     uint32_t table_index = 0;
     for (;;) {
       ArtMethod* current_interface_method = GetInterfaceMethod(table_index, pointer_size);
@@ -159,7 +160,7 @@
   }
 
   // Compute the number of entries in this table.
-  size_t NumEntries(size_t pointer_size) const {
+  size_t NumEntries(PointerSize pointer_size) const {
     uint32_t table_index = 0;
     while (GetInterfaceMethod(table_index, pointer_size) != nullptr) {
       ++table_index;
@@ -168,41 +169,39 @@
   }
 
   // Compute the size in bytes taken by this table.
-  size_t ComputeSize(size_t pointer_size) const {
+  size_t ComputeSize(PointerSize pointer_size) const {
     // Add the end marker.
     return ComputeSize(NumEntries(pointer_size), pointer_size);
   }
 
   // Compute the size in bytes needed for copying the given `table` and add
   // one more entry.
-  static size_t ComputeSizeWithOneMoreEntry(ImtConflictTable* table, size_t pointer_size) {
+  static size_t ComputeSizeWithOneMoreEntry(ImtConflictTable* table, PointerSize pointer_size) {
     return table->ComputeSize(pointer_size) + EntrySize(pointer_size);
   }
 
   // Compute size with a fixed number of entries.
-  static size_t ComputeSize(size_t num_entries, size_t pointer_size) {
+  static size_t ComputeSize(size_t num_entries, PointerSize pointer_size) {
     return (num_entries + 1) * EntrySize(pointer_size);  // Add one for null terminator.
   }
 
-  static size_t EntrySize(size_t pointer_size) {
-    return pointer_size * static_cast<size_t>(kMethodCount);
+  static size_t EntrySize(PointerSize pointer_size) {
+    return static_cast<size_t>(pointer_size) * static_cast<size_t>(kMethodCount);
   }
 
  private:
-  ArtMethod* GetMethod(size_t index, size_t pointer_size) const {
-    if (pointer_size == 8) {
+  ArtMethod* GetMethod(size_t index, PointerSize pointer_size) const {
+    if (pointer_size == PointerSize::k64) {
       return reinterpret_cast<ArtMethod*>(static_cast<uintptr_t>(data64_[index]));
     } else {
-      DCHECK_EQ(pointer_size, 4u);
       return reinterpret_cast<ArtMethod*>(static_cast<uintptr_t>(data32_[index]));
     }
   }
 
-  void SetMethod(size_t index, size_t pointer_size, ArtMethod* method) {
-    if (pointer_size == 8) {
+  void SetMethod(size_t index, PointerSize pointer_size, ArtMethod* method) {
+    if (pointer_size == PointerSize::k64) {
       data64_[index] = dchecked_integral_cast<uint64_t>(reinterpret_cast<uintptr_t>(method));
     } else {
-      DCHECK_EQ(pointer_size, 4u);
       data32_[index] = dchecked_integral_cast<uint32_t>(reinterpret_cast<uintptr_t>(method));
     }
   }
@@ -223,7 +222,7 @@
   ArtMethod() : access_flags_(0), dex_code_item_offset_(0), dex_method_index_(0),
       method_index_(0), hotness_count_(0) { }
 
-  ArtMethod(ArtMethod* src, size_t image_pointer_size) {
+  ArtMethod(ArtMethod* src, PointerSize image_pointer_size) {
     CopyFrom(src, image_pointer_size);
   }
 
@@ -428,42 +427,45 @@
     dex_method_index_ = new_idx;
   }
 
-  ALWAYS_INLINE ArtMethod** GetDexCacheResolvedMethods(size_t pointer_size)
+  ALWAYS_INLINE ArtMethod** GetDexCacheResolvedMethods(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
-  ALWAYS_INLINE ArtMethod* GetDexCacheResolvedMethod(uint16_t method_index, size_t ptr_size)
+  ALWAYS_INLINE ArtMethod* GetDexCacheResolvedMethod(uint16_t method_index,
+                                                     PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
   ALWAYS_INLINE void SetDexCacheResolvedMethod(uint16_t method_index,
                                                ArtMethod* new_method,
-                                               size_t ptr_size)
+                                               PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
-  ALWAYS_INLINE void SetDexCacheResolvedMethods(ArtMethod** new_dex_cache_methods, size_t ptr_size)
+  ALWAYS_INLINE void SetDexCacheResolvedMethods(ArtMethod** new_dex_cache_methods,
+                                                PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
-  bool HasDexCacheResolvedMethods(size_t pointer_size) SHARED_REQUIRES(Locks::mutator_lock_);
-  bool HasSameDexCacheResolvedMethods(ArtMethod* other, size_t pointer_size)
+  bool HasDexCacheResolvedMethods(PointerSize pointer_size) SHARED_REQUIRES(Locks::mutator_lock_);
+  bool HasSameDexCacheResolvedMethods(ArtMethod* other, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
-  bool HasSameDexCacheResolvedMethods(ArtMethod** other_cache, size_t pointer_size)
+  bool HasSameDexCacheResolvedMethods(ArtMethod** other_cache, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   template <bool kWithCheck = true>
-  mirror::Class* GetDexCacheResolvedType(uint32_t type_idx, size_t ptr_size)
+  mirror::Class* GetDexCacheResolvedType(uint32_t type_idx, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
-  void SetDexCacheResolvedTypes(GcRoot<mirror::Class>* new_dex_cache_types, size_t ptr_size)
+  void SetDexCacheResolvedTypes(GcRoot<mirror::Class>* new_dex_cache_types,
+                                PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
-  bool HasDexCacheResolvedTypes(size_t pointer_size) SHARED_REQUIRES(Locks::mutator_lock_);
-  bool HasSameDexCacheResolvedTypes(ArtMethod* other, size_t pointer_size)
+  bool HasDexCacheResolvedTypes(PointerSize pointer_size) SHARED_REQUIRES(Locks::mutator_lock_);
+  bool HasSameDexCacheResolvedTypes(ArtMethod* other, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
-  bool HasSameDexCacheResolvedTypes(GcRoot<mirror::Class>* other_cache, size_t pointer_size)
+  bool HasSameDexCacheResolvedTypes(GcRoot<mirror::Class>* other_cache, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Get the Class* from the type index into this method's dex cache.
-  mirror::Class* GetClassFromTypeIndex(uint16_t type_idx, bool resolve, size_t ptr_size)
+  mirror::Class* GetClassFromTypeIndex(uint16_t type_idx, bool resolve, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Returns true if this method has the same name and signature of the other method.
   bool HasSameNameAndSignature(ArtMethod* other) SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Find the method that this method overrides.
-  ArtMethod* FindOverriddenMethod(size_t pointer_size)
+  ArtMethod* FindOverriddenMethod(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Find the method index for this method within other_dexfile. If this method isn't present then
@@ -478,21 +480,22 @@
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   const void* GetEntryPointFromQuickCompiledCode() {
-    return GetEntryPointFromQuickCompiledCodePtrSize(sizeof(void*));
+    return GetEntryPointFromQuickCompiledCodePtrSize(kRuntimePointerSize);
   }
-  ALWAYS_INLINE const void* GetEntryPointFromQuickCompiledCodePtrSize(size_t pointer_size) {
+  ALWAYS_INLINE const void* GetEntryPointFromQuickCompiledCodePtrSize(PointerSize pointer_size) {
     return GetNativePointer<const void*>(
         EntryPointFromQuickCompiledCodeOffset(pointer_size), pointer_size);
   }
 
   void SetEntryPointFromQuickCompiledCode(const void* entry_point_from_quick_compiled_code) {
     SetEntryPointFromQuickCompiledCodePtrSize(entry_point_from_quick_compiled_code,
-                                              sizeof(void*));
+                                              kRuntimePointerSize);
   }
   ALWAYS_INLINE void SetEntryPointFromQuickCompiledCodePtrSize(
-      const void* entry_point_from_quick_compiled_code, size_t pointer_size) {
+      const void* entry_point_from_quick_compiled_code, PointerSize pointer_size) {
     SetNativePointer(EntryPointFromQuickCompiledCodeOffset(pointer_size),
-                     entry_point_from_quick_compiled_code, pointer_size);
+                     entry_point_from_quick_compiled_code,
+                     pointer_size);
   }
 
   void RegisterNative(const void* native_method, bool is_fast)
@@ -500,81 +503,84 @@
 
   void UnregisterNative() SHARED_REQUIRES(Locks::mutator_lock_);
 
-  static MemberOffset DexCacheResolvedMethodsOffset(size_t pointer_size) {
+  static MemberOffset DexCacheResolvedMethodsOffset(PointerSize pointer_size) {
     return MemberOffset(PtrSizedFieldsOffset(pointer_size) + OFFSETOF_MEMBER(
-        PtrSizedFields, dex_cache_resolved_methods_) / sizeof(void*) * pointer_size);
+        PtrSizedFields, dex_cache_resolved_methods_) / sizeof(void*)
+            * static_cast<size_t>(pointer_size));
   }
 
-  static MemberOffset DexCacheResolvedTypesOffset(size_t pointer_size) {
+  static MemberOffset DexCacheResolvedTypesOffset(PointerSize pointer_size) {
     return MemberOffset(PtrSizedFieldsOffset(pointer_size) + OFFSETOF_MEMBER(
-        PtrSizedFields, dex_cache_resolved_types_) / sizeof(void*) * pointer_size);
+        PtrSizedFields, dex_cache_resolved_types_) / sizeof(void*)
+            * static_cast<size_t>(pointer_size));
   }
 
-  static MemberOffset DataOffset(size_t pointer_size) {
+  static MemberOffset DataOffset(PointerSize pointer_size) {
     return MemberOffset(PtrSizedFieldsOffset(pointer_size) + OFFSETOF_MEMBER(
-        PtrSizedFields, data_) / sizeof(void*) * pointer_size);
+        PtrSizedFields, data_) / sizeof(void*) * static_cast<size_t>(pointer_size));
   }
 
-  static MemberOffset EntryPointFromJniOffset(size_t pointer_size) {
+  static MemberOffset EntryPointFromJniOffset(PointerSize pointer_size) {
     return DataOffset(pointer_size);
   }
 
-  static MemberOffset EntryPointFromQuickCompiledCodeOffset(size_t pointer_size) {
+  static MemberOffset EntryPointFromQuickCompiledCodeOffset(PointerSize pointer_size) {
     return MemberOffset(PtrSizedFieldsOffset(pointer_size) + OFFSETOF_MEMBER(
-        PtrSizedFields, entry_point_from_quick_compiled_code_) / sizeof(void*) * pointer_size);
+        PtrSizedFields, entry_point_from_quick_compiled_code_) / sizeof(void*)
+            * static_cast<size_t>(pointer_size));
   }
 
-  ImtConflictTable* GetImtConflictTable(size_t pointer_size) {
+  ImtConflictTable* GetImtConflictTable(PointerSize pointer_size) {
     DCHECK(IsRuntimeMethod());
     return reinterpret_cast<ImtConflictTable*>(GetDataPtrSize(pointer_size));
   }
 
-  ALWAYS_INLINE void SetImtConflictTable(ImtConflictTable* table, size_t pointer_size) {
+  ALWAYS_INLINE void SetImtConflictTable(ImtConflictTable* table, PointerSize pointer_size) {
     DCHECK(IsRuntimeMethod());
     SetDataPtrSize(table, pointer_size);
   }
 
-  ProfilingInfo* GetProfilingInfo(size_t pointer_size) {
+  ProfilingInfo* GetProfilingInfo(PointerSize pointer_size) {
     return reinterpret_cast<ProfilingInfo*>(GetDataPtrSize(pointer_size));
   }
 
   ALWAYS_INLINE void SetProfilingInfo(ProfilingInfo* info) {
-    SetDataPtrSize(info, sizeof(void*));
+    SetDataPtrSize(info, kRuntimePointerSize);
   }
 
-  ALWAYS_INLINE void SetProfilingInfoPtrSize(ProfilingInfo* info, size_t pointer_size) {
+  ALWAYS_INLINE void SetProfilingInfoPtrSize(ProfilingInfo* info, PointerSize pointer_size) {
     SetDataPtrSize(info, pointer_size);
   }
 
   static MemberOffset ProfilingInfoOffset() {
-    DCHECK(IsImagePointerSize(sizeof(void*)));
-    return DataOffset(sizeof(void*));
+    DCHECK(IsImagePointerSize(kRuntimePointerSize));
+    return DataOffset(kRuntimePointerSize);
   }
 
   void* GetEntryPointFromJni() {
     DCHECK(IsNative());
-    return GetEntryPointFromJniPtrSize(sizeof(void*));
+    return GetEntryPointFromJniPtrSize(kRuntimePointerSize);
   }
 
-  ALWAYS_INLINE void* GetEntryPointFromJniPtrSize(size_t pointer_size) {
+  ALWAYS_INLINE void* GetEntryPointFromJniPtrSize(PointerSize pointer_size) {
     return GetDataPtrSize(pointer_size);
   }
 
   void SetEntryPointFromJni(const void* entrypoint) {
     DCHECK(IsNative());
-    SetEntryPointFromJniPtrSize(entrypoint, sizeof(void*));
+    SetEntryPointFromJniPtrSize(entrypoint, kRuntimePointerSize);
   }
 
-  ALWAYS_INLINE void SetEntryPointFromJniPtrSize(const void* entrypoint, size_t pointer_size) {
+  ALWAYS_INLINE void SetEntryPointFromJniPtrSize(const void* entrypoint, PointerSize pointer_size) {
     SetDataPtrSize(entrypoint, pointer_size);
   }
 
-  ALWAYS_INLINE void* GetDataPtrSize(size_t pointer_size) {
+  ALWAYS_INLINE void* GetDataPtrSize(PointerSize pointer_size) {
     DCHECK(IsImagePointerSize(pointer_size));
     return GetNativePointer<void*>(DataOffset(pointer_size), pointer_size);
   }
 
-  ALWAYS_INLINE void SetDataPtrSize(const void* data, size_t pointer_size) {
+  ALWAYS_INLINE void SetDataPtrSize(const void* data, PointerSize pointer_size) {
     DCHECK(IsImagePointerSize(pointer_size));
     SetNativePointer(DataOffset(pointer_size), data, pointer_size);
   }
@@ -603,7 +609,7 @@
 
   // NO_THREAD_SAFETY_ANALYSIS since we don't know what the callback requires.
   template<ReadBarrierOption kReadBarrierOption = kWithReadBarrier, typename RootVisitorType>
-  void VisitRoots(RootVisitorType& visitor, size_t pointer_size) NO_THREAD_SAFETY_ANALYSIS;
+  void VisitRoots(RootVisitorType& visitor, PointerSize pointer_size) NO_THREAD_SAFETY_ANALYSIS;
 
   const DexFile* GetDexFile() SHARED_REQUIRES(Locks::mutator_lock_);
 
@@ -624,7 +630,8 @@
 
   const DexFile::CodeItem* GetCodeItem() SHARED_REQUIRES(Locks::mutator_lock_);
 
-  bool IsResolvedTypeIdx(uint16_t type_idx, size_t ptr_size) SHARED_REQUIRES(Locks::mutator_lock_);
+  bool IsResolvedTypeIdx(uint16_t type_idx, PointerSize pointer_size)
+      SHARED_REQUIRES(Locks::mutator_lock_);
 
   int32_t GetLineNumFromDexPC(uint32_t dex_pc) SHARED_REQUIRES(Locks::mutator_lock_);
 
@@ -645,14 +652,14 @@
 
   // May cause thread suspension due to GetClassFromTypeIdx calling ResolveType this caused a large
   // number of bugs at call sites.
-  mirror::Class* GetReturnType(bool resolve, size_t ptr_size)
+  mirror::Class* GetReturnType(bool resolve, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   mirror::ClassLoader* GetClassLoader() SHARED_REQUIRES(Locks::mutator_lock_);
 
   mirror::DexCache* GetDexCache() SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ALWAYS_INLINE ArtMethod* GetInterfaceMethodIfProxy(size_t pointer_size)
+  ALWAYS_INLINE ArtMethod* GetInterfaceMethodIfProxy(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // May cause thread suspension due to class resolution.
@@ -660,22 +667,22 @@
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Size of an instance of this native class.
-  static size_t Size(size_t pointer_size) {
+  static size_t Size(PointerSize pointer_size) {
     return PtrSizedFieldsOffset(pointer_size) +
-        (sizeof(PtrSizedFields) / sizeof(void*)) * pointer_size;
+        (sizeof(PtrSizedFields) / sizeof(void*)) * static_cast<size_t>(pointer_size);
   }
 
   // Alignment of an instance of this native class.
-  static size_t Alignment(size_t pointer_size) {
+  static size_t Alignment(PointerSize pointer_size) {
     // The ArtMethod alignment is the same as image pointer size. This differs from
     // alignof(ArtMethod) if cross-compiling with pointer_size != sizeof(void*).
-    return pointer_size;
+    return static_cast<size_t>(pointer_size);
   }
 
-  void CopyFrom(ArtMethod* src, size_t image_pointer_size)
+  void CopyFrom(ArtMethod* src, PointerSize image_pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ALWAYS_INLINE GcRoot<mirror::Class>* GetDexCacheResolvedTypes(size_t pointer_size)
+  ALWAYS_INLINE GcRoot<mirror::Class>* GetDexCacheResolvedTypes(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Note, hotness_counter_ updates are non-atomic but it doesn't need to be precise.  Also,
@@ -711,12 +718,13 @@
   // Update heap objects and non-entrypoint pointers by the passed in visitor for image relocation.
   // Does not use read barrier.
   template <typename Visitor>
-  ALWAYS_INLINE void UpdateObjectsForImageRelocation(const Visitor& visitor, size_t pointer_size)
+  ALWAYS_INLINE void UpdateObjectsForImageRelocation(const Visitor& visitor,
+                                                     PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Update entry points by passing them through the visitor.
   template <ReadBarrierOption kReadBarrierOption = kWithReadBarrier, typename Visitor>
-  ALWAYS_INLINE void UpdateEntrypoints(const Visitor& visitor, size_t pointer_size);
+  ALWAYS_INLINE void UpdateEntrypoints(const Visitor& visitor, PointerSize pointer_size);
 
  protected:
   // Field order required by test "ValidateFieldOrderOfJavaCppUnionClasses".
@@ -765,20 +773,20 @@
   } ptr_sized_fields_;
 
  private:
-  static constexpr size_t PtrSizedFieldsOffset(size_t pointer_size) {
+  static constexpr size_t PtrSizedFieldsOffset(PointerSize pointer_size) {
     // Round up to pointer size for padding field. Tested in art_method.cc.
-    return RoundUp(offsetof(ArtMethod, hotness_count_) + sizeof(hotness_count_), pointer_size);
+    return RoundUp(offsetof(ArtMethod, hotness_count_) + sizeof(hotness_count_),
+                   static_cast<size_t>(pointer_size));
   }
 
   // Compare given pointer size to the image pointer size.
-  static bool IsImagePointerSize(size_t pointer_size);
+  static bool IsImagePointerSize(PointerSize pointer_size);
 
   template<typename T>
-  ALWAYS_INLINE T GetNativePointer(MemberOffset offset, size_t pointer_size) const {
+  ALWAYS_INLINE T GetNativePointer(MemberOffset offset, PointerSize pointer_size) const {
     static_assert(std::is_pointer<T>::value, "T must be a pointer type");
-    DCHECK(ValidPointerSize(pointer_size)) << pointer_size;
     const auto addr = reinterpret_cast<uintptr_t>(this) + offset.Uint32Value();
-    if (pointer_size == sizeof(uint32_t)) {
+    if (pointer_size == PointerSize::k32) {
       return reinterpret_cast<T>(*reinterpret_cast<const uint32_t*>(addr));
     } else {
       auto v = *reinterpret_cast<const uint64_t*>(addr);
@@ -787,11 +795,10 @@
   }
 
   template<typename T>
-  ALWAYS_INLINE void SetNativePointer(MemberOffset offset, T new_value, size_t pointer_size) {
+  ALWAYS_INLINE void SetNativePointer(MemberOffset offset, T new_value, PointerSize pointer_size) {
     static_assert(std::is_pointer<T>::value, "T must be a pointer type");
-    DCHECK(ValidPointerSize(pointer_size)) << pointer_size;
     const auto addr = reinterpret_cast<uintptr_t>(this) + offset.Uint32Value();
-    if (pointer_size == sizeof(uint32_t)) {
+    if (pointer_size == PointerSize::k32) {
       uintptr_t ptr = reinterpret_cast<uintptr_t>(new_value);
       *reinterpret_cast<uint32_t*>(addr) = dchecked_integral_cast<uint32_t>(ptr);
     } else {
diff --git a/runtime/asm_support.h b/runtime/asm_support.h
index b7df90d..0619af8 100644
--- a/runtime/asm_support.h
+++ b/runtime/asm_support.h
@@ -57,8 +57,10 @@
 
 #if defined(__LP64__)
 #define POINTER_SIZE_SHIFT 3
+#define POINTER_SIZE art::PointerSize::k64
 #else
 #define POINTER_SIZE_SHIFT 2
+#define POINTER_SIZE art::PointerSize::k32
 #endif
 ADD_TEST_EQ(static_cast<size_t>(1U << POINTER_SIZE_SHIFT),
             static_cast<size_t>(__SIZEOF_POINTER__))
@@ -71,54 +73,54 @@
 // Offset of field Thread::tlsPtr_.exception.
 #define THREAD_EXCEPTION_OFFSET (THREAD_CARD_TABLE_OFFSET + __SIZEOF_POINTER__)
 ADD_TEST_EQ(THREAD_EXCEPTION_OFFSET,
-            art::Thread::ExceptionOffset<__SIZEOF_POINTER__>().Int32Value())
+            art::Thread::ExceptionOffset<POINTER_SIZE>().Int32Value())
 
 // Offset of field Thread::tlsPtr_.managed_stack.top_quick_frame_.
 #define THREAD_TOP_QUICK_FRAME_OFFSET (THREAD_CARD_TABLE_OFFSET + (3 * __SIZEOF_POINTER__))
 ADD_TEST_EQ(THREAD_TOP_QUICK_FRAME_OFFSET,
-            art::Thread::TopOfManagedStackOffset<__SIZEOF_POINTER__>().Int32Value())
+            art::Thread::TopOfManagedStackOffset<POINTER_SIZE>().Int32Value())
 
 // Offset of field Thread::tlsPtr_.self.
 #define THREAD_SELF_OFFSET (THREAD_CARD_TABLE_OFFSET + (9 * __SIZEOF_POINTER__))
 ADD_TEST_EQ(THREAD_SELF_OFFSET,
-            art::Thread::SelfOffset<__SIZEOF_POINTER__>().Int32Value())
+            art::Thread::SelfOffset<POINTER_SIZE>().Int32Value())
 
 // Offset of field Thread::tlsPtr_.thread_local_objects.
 #define THREAD_LOCAL_OBJECTS_OFFSET (THREAD_CARD_TABLE_OFFSET + 197 * __SIZEOF_POINTER__)
 ADD_TEST_EQ(THREAD_LOCAL_OBJECTS_OFFSET,
-            art::Thread::ThreadLocalObjectsOffset<__SIZEOF_POINTER__>().Int32Value())
+            art::Thread::ThreadLocalObjectsOffset<POINTER_SIZE>().Int32Value())
 // Offset of field Thread::tlsPtr_.thread_local_pos.
 #define THREAD_LOCAL_POS_OFFSET (THREAD_LOCAL_OBJECTS_OFFSET + __SIZEOF_SIZE_T__)
 ADD_TEST_EQ(THREAD_LOCAL_POS_OFFSET,
-            art::Thread::ThreadLocalPosOffset<__SIZEOF_POINTER__>().Int32Value())
+            art::Thread::ThreadLocalPosOffset<POINTER_SIZE>().Int32Value())
 // Offset of field Thread::tlsPtr_.thread_local_end.
 #define THREAD_LOCAL_END_OFFSET (THREAD_LOCAL_POS_OFFSET + __SIZEOF_POINTER__)
 ADD_TEST_EQ(THREAD_LOCAL_END_OFFSET,
-            art::Thread::ThreadLocalEndOffset<__SIZEOF_POINTER__>().Int32Value())
+            art::Thread::ThreadLocalEndOffset<POINTER_SIZE>().Int32Value())
 // Offset of field Thread::tlsPtr_.mterp_current_ibase.
 #define THREAD_CURRENT_IBASE_OFFSET (THREAD_LOCAL_END_OFFSET + __SIZEOF_POINTER__)
 ADD_TEST_EQ(THREAD_CURRENT_IBASE_OFFSET,
-            art::Thread::MterpCurrentIBaseOffset<__SIZEOF_POINTER__>().Int32Value())
+            art::Thread::MterpCurrentIBaseOffset<POINTER_SIZE>().Int32Value())
 // Offset of field Thread::tlsPtr_.mterp_default_ibase.
 #define THREAD_DEFAULT_IBASE_OFFSET (THREAD_CURRENT_IBASE_OFFSET + __SIZEOF_POINTER__)
 ADD_TEST_EQ(THREAD_DEFAULT_IBASE_OFFSET,
-            art::Thread::MterpDefaultIBaseOffset<__SIZEOF_POINTER__>().Int32Value())
+            art::Thread::MterpDefaultIBaseOffset<POINTER_SIZE>().Int32Value())
 // Offset of field Thread::tlsPtr_.mterp_alt_ibase.
 #define THREAD_ALT_IBASE_OFFSET (THREAD_DEFAULT_IBASE_OFFSET + __SIZEOF_POINTER__)
 ADD_TEST_EQ(THREAD_ALT_IBASE_OFFSET,
-            art::Thread::MterpAltIBaseOffset<__SIZEOF_POINTER__>().Int32Value())
+            art::Thread::MterpAltIBaseOffset<POINTER_SIZE>().Int32Value())
 // Offset of field Thread::tlsPtr_.rosalloc_runs.
 #define THREAD_ROSALLOC_RUNS_OFFSET (THREAD_ALT_IBASE_OFFSET + __SIZEOF_POINTER__)
 ADD_TEST_EQ(THREAD_ROSALLOC_RUNS_OFFSET,
-            art::Thread::RosAllocRunsOffset<__SIZEOF_POINTER__>().Int32Value())
+            art::Thread::RosAllocRunsOffset<POINTER_SIZE>().Int32Value())
 // Offset of field Thread::tlsPtr_.thread_local_alloc_stack_top.
 #define THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET (THREAD_ROSALLOC_RUNS_OFFSET + 16 * __SIZEOF_POINTER__)
 ADD_TEST_EQ(THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET,
-            art::Thread::ThreadLocalAllocStackTopOffset<__SIZEOF_POINTER__>().Int32Value())
+            art::Thread::ThreadLocalAllocStackTopOffset<POINTER_SIZE>().Int32Value())
 // Offset of field Thread::tlsPtr_.thread_local_alloc_stack_end.
 #define THREAD_LOCAL_ALLOC_STACK_END_OFFSET (THREAD_ROSALLOC_RUNS_OFFSET + 17 * __SIZEOF_POINTER__)
 ADD_TEST_EQ(THREAD_LOCAL_ALLOC_STACK_END_OFFSET,
-            art::Thread::ThreadLocalAllocStackEndOffset<__SIZEOF_POINTER__>().Int32Value())
+            art::Thread::ThreadLocalAllocStackEndOffset<POINTER_SIZE>().Int32Value())
 
 // Offsets within ShadowFrame.
 #define SHADOWFRAME_LINK_OFFSET 0
diff --git a/runtime/base/enums.h b/runtime/base/enums.h
new file mode 100644
index 0000000..51b86ea
--- /dev/null
+++ b/runtime/base/enums.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_RUNTIME_BASE_ENUMS_H_
+#define ART_RUNTIME_BASE_ENUMS_H_
+
+#include <cstddef>
+#include <ostream>
+
+#include "base/logging.h"
+#include "base/macros.h"
+
+namespace art {
+
+enum class PointerSize : size_t {
+  k32 = 4,
+  k64 = 8
+};
+std::ostream& operator<<(std::ostream& os, const PointerSize& rhs);
+
+static constexpr PointerSize kRuntimePointerSize = sizeof(void*) == 8U
+                                                       ? PointerSize::k64
+                                                       : PointerSize::k32;
+
+template <typename T>
+static constexpr PointerSize ConvertToPointerSize(T any) {
+  if (any == 4 || any == 8) {
+    return static_cast<PointerSize>(any);
+  } else {
+    LOG(FATAL);
+    UNREACHABLE();
+  }
+}
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_BASE_ENUMS_H_
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index f13fea0..ec589b2 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -323,7 +323,7 @@
       quick_imt_conflict_trampoline_(nullptr),
       quick_generic_jni_trampoline_(nullptr),
       quick_to_interpreter_bridge_trampoline_(nullptr),
-      image_pointer_size_(sizeof(void*)) {
+      image_pointer_size_(kRuntimePointerSize) {
   CHECK(intern_table_ != nullptr);
   static_assert(kFindArrayCacheSize == arraysize(find_array_class_cache_),
                 "Array cache size wrong.");
@@ -361,10 +361,6 @@
 
   // Use the pointer size from the runtime since we are probably creating the image.
   image_pointer_size_ = InstructionSetPointerSize(runtime->GetInstructionSet());
-  if (!ValidPointerSize(image_pointer_size_)) {
-    *error_msg = StringPrintf("Invalid image pointer size: %zu", image_pointer_size_);
-    return false;
-  }
 
   // java_lang_Class comes first, it's needed for AllocClass
   // The GC can't handle an object with a null class since we can't get the size of this object.
@@ -791,7 +787,7 @@
 
 static void SanityCheckArtMethodPointerArray(mirror::PointerArray* arr,
                                              mirror::Class* expected_class,
-                                             size_t pointer_size,
+                                             PointerSize pointer_size,
                                              const std::vector<gc::space::ImageSpace*>& spaces)
     SHARED_REQUIRES(Locks::mutator_lock_) {
   CHECK(arr != nullptr);
@@ -809,7 +805,7 @@
 
 static void SanityCheckArtMethodPointerArray(ArtMethod** arr,
                                              size_t size,
-                                             size_t pointer_size,
+                                             PointerSize pointer_size,
                                              const std::vector<gc::space::ImageSpace*>& spaces)
     SHARED_REQUIRES(Locks::mutator_lock_) {
   CHECK_EQ(arr != nullptr, size != 0u);
@@ -883,7 +879,7 @@
 // Set image methods' entry point to interpreter.
 class SetInterpreterEntrypointArtMethodVisitor : public ArtMethodVisitor {
  public:
-  explicit SetInterpreterEntrypointArtMethodVisitor(size_t image_pointer_size)
+  explicit SetInterpreterEntrypointArtMethodVisitor(PointerSize image_pointer_size)
     : image_pointer_size_(image_pointer_size) {}
 
   void Visit(ArtMethod* method) OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) {
@@ -897,7 +893,7 @@
   }
 
  private:
-  const size_t image_pointer_size_;
+  const PointerSize image_pointer_size_;
 
   DISALLOW_COPY_AND_ASSIGN(SetInterpreterEntrypointArtMethodVisitor);
 };
@@ -907,7 +903,7 @@
   const void* quick_imt_conflict_trampoline;
   const void* quick_generic_jni_trampoline;
   const void* quick_to_interpreter_bridge_trampoline;
-  size_t pointer_size;
+  PointerSize pointer_size;
   ArtMethod* m;
   bool error;
 };
@@ -939,18 +935,19 @@
   gc::Heap* const heap = runtime->GetHeap();
   std::vector<gc::space::ImageSpace*> spaces = heap->GetBootImageSpaces();
   CHECK(!spaces.empty());
-  image_pointer_size_ = spaces[0]->GetImageHeader().GetPointerSize();
-  if (!ValidPointerSize(image_pointer_size_)) {
-    *error_msg = StringPrintf("Invalid image pointer size: %zu", image_pointer_size_);
+  uint32_t pointer_size_unchecked = spaces[0]->GetImageHeader().GetPointerSizeUnchecked();
+  if (!ValidPointerSize(pointer_size_unchecked)) {
+    *error_msg = StringPrintf("Invalid image pointer size: %u", pointer_size_unchecked);
     return false;
   }
+  image_pointer_size_ = spaces[0]->GetImageHeader().GetPointerSize();
   if (!runtime->IsAotCompiler()) {
     // Only the Aot compiler supports having an image with a different pointer size than the
     // runtime. This happens on the host for compiling 32 bit tests since we use a 64 bit libart
     // compiler. We may also use 32 bit dex2oat on a system with 64 bit apps.
-    if (image_pointer_size_ != sizeof(void*)) {
+    if (image_pointer_size_ != kRuntimePointerSize) {
       *error_msg = StringPrintf("Runtime must use current image pointer size: %zu vs %zu",
-                                image_pointer_size_,
+                                static_cast<size_t>(image_pointer_size_),
                                 sizeof(void*));
       return false;
     }
@@ -1150,7 +1147,7 @@
   explicit FixupArtMethodArrayVisitor(const ImageHeader& header) : header_(header) {}
 
   virtual void Visit(ArtMethod* method) SHARED_REQUIRES(Locks::mutator_lock_) {
-    GcRoot<mirror::Class>* resolved_types = method->GetDexCacheResolvedTypes(sizeof(void*));
+    GcRoot<mirror::Class>* resolved_types = method->GetDexCacheResolvedTypes(kRuntimePointerSize);
     const bool is_copied = method->IsCopied();
     if (resolved_types != nullptr) {
       bool in_image_space = false;
@@ -1165,10 +1162,10 @@
       if (!is_copied || in_image_space) {
         // Go through the array so that we don't need to do a slow map lookup.
         method->SetDexCacheResolvedTypes(*reinterpret_cast<GcRoot<mirror::Class>**>(resolved_types),
-                                         sizeof(void*));
+                                         kRuntimePointerSize);
       }
     }
-    ArtMethod** resolved_methods = method->GetDexCacheResolvedMethods(sizeof(void*));
+    ArtMethod** resolved_methods = method->GetDexCacheResolvedMethods(kRuntimePointerSize);
     if (resolved_methods != nullptr) {
       bool in_image_space = false;
       if (kIsDebugBuild || is_copied) {
@@ -1182,7 +1179,7 @@
       if (!is_copied || in_image_space) {
         // Go through the array so that we don't need to do a slow map lookup.
         method->SetDexCacheResolvedMethods(*reinterpret_cast<ArtMethod***>(resolved_methods),
-                                           sizeof(void*));
+                                           kRuntimePointerSize);
       }
     }
   }
@@ -1382,11 +1379,11 @@
                 VLOG(image) << "From " << klass->GetDexCache()->GetDexFile()->GetBaseLocation();
               }
               VLOG(image) << "Direct methods";
-              for (ArtMethod& m : klass->GetDirectMethods(sizeof(void*))) {
+              for (ArtMethod& m : klass->GetDirectMethods(kRuntimePointerSize)) {
                 VLOG(image) << PrettyMethod(&m);
               }
               VLOG(image) << "Virtual methods";
-              for (ArtMethod& m : klass->GetVirtualMethods(sizeof(void*))) {
+              for (ArtMethod& m : klass->GetVirtualMethods(kRuntimePointerSize)) {
                 VLOG(image) << PrettyMethod(&m);
               }
             }
@@ -1422,7 +1419,7 @@
               }
             }
             if (kIsDebugBuild) {
-              for (ArtMethod& m : klass->GetDirectMethods(sizeof(void*))) {
+              for (ArtMethod& m : klass->GetDirectMethods(kRuntimePointerSize)) {
                 const void* code = m.GetEntryPointFromQuickCompiledCode();
                 const void* oat_code = m.IsInvokable() ? GetQuickOatCodeFor(&m) : code;
                 if (!IsQuickResolutionStub(code) &&
@@ -1432,7 +1429,7 @@
                   DCHECK_EQ(code, oat_code) << PrettyMethod(&m);
                 }
               }
-              for (ArtMethod& m : klass->GetVirtualMethods(sizeof(void*))) {
+              for (ArtMethod& m : klass->GetVirtualMethods(kRuntimePointerSize)) {
                 const void* code = m.GetEntryPointFromQuickCompiledCode();
                 const void* oat_code = m.IsInvokable() ? GetQuickOatCodeFor(&m) : code;
                 if (!IsQuickResolutionStub(code) &&
@@ -1451,14 +1448,14 @@
   if (*out_forward_dex_cache_array) {
     ScopedTrace timing("Fixup ArtMethod dex cache arrays");
     FixupArtMethodArrayVisitor visitor(header);
-    header.VisitPackedArtMethods(&visitor, space->Begin(), sizeof(void*));
+    header.VisitPackedArtMethods(&visitor, space->Begin(), kRuntimePointerSize);
     Runtime::Current()->GetHeap()->WriteBarrierEveryFieldOf(class_loader.Get());
   }
   if (kVerifyArtMethodDeclaringClasses) {
     ScopedTrace timing("Verify declaring classes");
     ReaderMutexLock rmu(self, *Locks::heap_bitmap_lock_);
     VerifyDeclaringClassVisitor visitor;
-    header.VisitPackedArtMethods(&visitor, space->Begin(), sizeof(void*));
+    header.VisitPackedArtMethods(&visitor, space->Begin(), kRuntimePointerSize);
   }
   return true;
 }
@@ -1810,7 +1807,7 @@
     // This verification needs to happen after the classes have been added to the class loader.
     // Since it ensures classes are in the class table.
     VerifyClassInTableArtMethodVisitor visitor2(class_table);
-    header.VisitPackedArtMethods(&visitor2, space->Begin(), sizeof(void*));
+    header.VisitPackedArtMethods(&visitor2, space->Begin(), kRuntimePointerSize);
   }
   VLOG(class_linker) << "Adding image space took " << PrettyDuration(NanoTime() - start_time);
   return true;
@@ -2054,9 +2051,10 @@
 }
 
 mirror::PointerArray* ClassLinker::AllocPointerArray(Thread* self, size_t length) {
-  return down_cast<mirror::PointerArray*>(image_pointer_size_ == 8u ?
-      static_cast<mirror::Array*>(mirror::LongArray::Alloc(self, length)) :
-      static_cast<mirror::Array*>(mirror::IntArray::Alloc(self, length)));
+  return down_cast<mirror::PointerArray*>(
+      image_pointer_size_ == PointerSize::k64
+          ? static_cast<mirror::Array*>(mirror::LongArray::Alloc(self, length))
+          : static_cast<mirror::Array*>(mirror::IntArray::Alloc(self, length)));
 }
 
 mirror::DexCache* ClassLinker::AllocDexCache(Thread* self,
@@ -2081,8 +2079,6 @@
     raw_arrays = dex_file.GetOatDexFile()->GetDexCacheArrays();
   } else if (dex_file.NumStringIds() != 0u || dex_file.NumTypeIds() != 0u ||
       dex_file.NumMethodIds() != 0u || dex_file.NumFieldIds() != 0u) {
-    // NOTE: We "leak" the raw_arrays because we never destroy the dex cache.
-    DCHECK(image_pointer_size_ == 4u || image_pointer_size_ == 8u);
     // Zero-initialized.
     raw_arrays = reinterpret_cast<uint8_t*>(linear_alloc->Alloc(self, layout.Size()));
   }
@@ -4826,7 +4822,7 @@
 }
 
 static bool HasSameSignatureWithDifferentClassLoaders(Thread* self,
-                                                      size_t pointer_size,
+                                                      PointerSize pointer_size,
                                                       Handle<mirror::Class> klass,
                                                       Handle<mirror::Class> super_klass,
                                                       ArtMethod* method1,
@@ -5042,7 +5038,7 @@
   return class_loader == nullptr ? &boot_class_table_ : class_loader->GetClassTable();
 }
 
-static ImTable* FindSuperImt(mirror::Class* klass, size_t pointer_size)
+static ImTable* FindSuperImt(mirror::Class* klass, PointerSize pointer_size)
     SHARED_REQUIRES(Locks::mutator_lock_) {
   while (klass->HasSuperClass()) {
     klass = klass->GetSuperClass();
@@ -5580,7 +5576,7 @@
   LinkVirtualHashTable(Handle<mirror::Class> klass,
                        size_t hash_size,
                        uint32_t* hash_table,
-                       size_t image_pointer_size)
+                       PointerSize image_pointer_size)
      : klass_(klass),
        hash_size_(hash_size),
        hash_table_(hash_table),
@@ -5642,13 +5638,20 @@
   Handle<mirror::Class> klass_;
   const size_t hash_size_;
   uint32_t* const hash_table_;
-  const size_t image_pointer_size_;
+  const PointerSize image_pointer_size_;
 };
 
 const uint32_t LinkVirtualHashTable::invalid_index_ = std::numeric_limits<uint32_t>::max();
 const uint32_t LinkVirtualHashTable::removed_index_ = std::numeric_limits<uint32_t>::max() - 1;
 
-bool ClassLinker::LinkVirtualMethods(
+// b/30419309
+#if defined(__i386__)
+#define X86_OPTNONE __attribute__((optnone))
+#else
+#define X86_OPTNONE
+#endif
+
+X86_OPTNONE bool ClassLinker::LinkVirtualMethods(
     Thread* self,
     Handle<mirror::Class> klass,
     /*out*/std::unordered_map<size_t, ClassLinker::MethodTranslation>* default_translations) {
@@ -5896,7 +5899,7 @@
                                        Handle<mirror::IfTable> iftable,
                                        size_t ifstart,
                                        Handle<mirror::Class> iface,
-                                       size_t image_pointer_size)
+                                       PointerSize image_pointer_size)
     SHARED_REQUIRES(Locks::mutator_lock_) {
   DCHECK(self != nullptr);
   DCHECK(iface.Get() != nullptr);
@@ -6045,7 +6048,7 @@
                                                  ArtMethod* interface_method,
                                                  ArtMethod* method,
                                                  bool force_new_conflict_method) {
-  ImtConflictTable* current_table = conflict_method->GetImtConflictTable(sizeof(void*));
+  ImtConflictTable* current_table = conflict_method->GetImtConflictTable(kRuntimePointerSize);
   Runtime* const runtime = Runtime::Current();
   LinearAlloc* linear_alloc = GetAllocatorForClassLoader(klass->GetClassLoader());
   bool new_entry = conflict_method == runtime->GetImtConflictMethod() || force_new_conflict_method;
@@ -6174,7 +6177,7 @@
 
 ImtConflictTable* ClassLinker::CreateImtConflictTable(size_t count,
                                                       LinearAlloc* linear_alloc,
-                                                      size_t image_pointer_size) {
+                                                      PointerSize image_pointer_size) {
   void* data = linear_alloc->Alloc(Thread::Current(),
                                    ImtConflictTable::ComputeSize(count,
                                                                  image_pointer_size));
@@ -6507,7 +6510,7 @@
   return nullptr;
 }
 
-static void SanityCheckVTable(Handle<mirror::Class> klass, uint32_t pointer_size)
+static void SanityCheckVTable(Handle<mirror::Class> klass, PointerSize pointer_size)
     SHARED_REQUIRES(Locks::mutator_lock_) {
   mirror::PointerArray* check_vtable = klass->GetVTableDuringLinking();
   mirror::Class* superclass = (klass->HasSuperClass()) ? klass->GetSuperClass() : nullptr;
diff --git a/runtime/class_linker.h b/runtime/class_linker.h
index d6822c5..fcc6b23 100644
--- a/runtime/class_linker.h
+++ b/runtime/class_linker.h
@@ -25,6 +25,7 @@
 #include <vector>
 
 #include "base/allocator.h"
+#include "base/enums.h"
 #include "base/hash_set.h"
 #include "base/macros.h"
 #include "base/mutex.h"
@@ -566,8 +567,7 @@
       SHARED_REQUIRES(Locks::mutator_lock_)
       REQUIRES(!dex_lock_);
 
-  size_t GetImagePointerSize() const {
-    DCHECK(ValidPointerSize(image_pointer_size_)) << image_pointer_size_;
+  PointerSize GetImagePointerSize() const {
     return image_pointer_size_;
   }
 
@@ -630,7 +630,7 @@
   // Static version for when the class linker is not yet created.
   static ImtConflictTable* CreateImtConflictTable(size_t count,
                                                   LinearAlloc* linear_alloc,
-                                                  size_t pointer_size);
+                                                  PointerSize pointer_size);
 
 
   // Create the IMT and conflict tables for a class.
@@ -1166,7 +1166,7 @@
   const void* quick_to_interpreter_bridge_trampoline_;
 
   // Image pointer size.
-  size_t image_pointer_size_;
+  PointerSize image_pointer_size_;
 
   friend class ImageDumper;  // for DexLock
   friend class ImageWriter;  // for GetClassRoots
diff --git a/runtime/class_linker_test.cc b/runtime/class_linker_test.cc
index 48b6316..5031cf3 100644
--- a/runtime/class_linker_test.cc
+++ b/runtime/class_linker_test.cc
@@ -21,6 +21,7 @@
 
 #include "art_field-inl.h"
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "class_linker-inl.h"
 #include "common_runtime_test.h"
 #include "dex_file.h"
@@ -147,7 +148,7 @@
     EXPECT_EQ(0U, JavaLangObject->NumStaticFields());
     EXPECT_EQ(0U, JavaLangObject->NumDirectInterfaces());
 
-    size_t pointer_size = class_linker_->GetImagePointerSize();
+    PointerSize pointer_size = class_linker_->GetImagePointerSize();
     ArtMethod* unimplemented = runtime_->GetImtUnimplementedMethod();
     ImTable* imt = JavaLangObject->GetImt(pointer_size);
     ASSERT_NE(nullptr, imt);
@@ -216,7 +217,7 @@
     mirror::Class* array_ptr = array->GetComponentType();
     EXPECT_EQ(class_linker_->FindArrayClass(self, &array_ptr), array.Get());
 
-    size_t pointer_size = class_linker_->GetImagePointerSize();
+    PointerSize pointer_size = class_linker_->GetImagePointerSize();
     mirror::Class* JavaLangObject =
         class_linker_->FindSystemClass(self, "Ljava/lang/Object;");
     ImTable* JavaLangObject_imt = JavaLangObject->GetImt(pointer_size);
@@ -230,14 +231,14 @@
     EXPECT_TRUE(method->GetName() != nullptr);
     EXPECT_TRUE(method->GetSignature() != Signature::NoSignature());
 
-    EXPECT_TRUE(method->HasDexCacheResolvedMethods(sizeof(void*)));
-    EXPECT_TRUE(method->HasDexCacheResolvedTypes(sizeof(void*)));
+    EXPECT_TRUE(method->HasDexCacheResolvedMethods(kRuntimePointerSize));
+    EXPECT_TRUE(method->HasDexCacheResolvedTypes(kRuntimePointerSize));
     EXPECT_TRUE(method->HasSameDexCacheResolvedMethods(
         method->GetDeclaringClass()->GetDexCache()->GetResolvedMethods(),
-        sizeof(void*)));
+        kRuntimePointerSize));
     EXPECT_TRUE(method->HasSameDexCacheResolvedTypes(
         method->GetDeclaringClass()->GetDexCache()->GetResolvedTypes(),
-        sizeof(void*)));
+        kRuntimePointerSize));
   }
 
   void AssertField(mirror::Class* klass, ArtField* field)
@@ -275,7 +276,7 @@
     if (klass->IsInterface()) {
       EXPECT_TRUE(klass->IsAbstract());
       // Check that all direct methods are static (either <clinit> or a regular static method).
-      for (ArtMethod& m : klass->GetDirectMethods(sizeof(void*))) {
+      for (ArtMethod& m : klass->GetDirectMethods(kRuntimePointerSize)) {
         EXPECT_TRUE(m.IsStatic());
         EXPECT_TRUE(m.IsDirect());
       }
@@ -312,19 +313,19 @@
     EXPECT_FALSE(klass->IsPrimitive());
     EXPECT_TRUE(klass->CanAccess(klass.Get()));
 
-    for (ArtMethod& method : klass->GetDirectMethods(sizeof(void*))) {
+    for (ArtMethod& method : klass->GetDirectMethods(kRuntimePointerSize)) {
       AssertMethod(&method);
       EXPECT_TRUE(method.IsDirect());
       EXPECT_EQ(klass.Get(), method.GetDeclaringClass());
     }
 
-    for (ArtMethod& method : klass->GetDeclaredVirtualMethods(sizeof(void*))) {
+    for (ArtMethod& method : klass->GetDeclaredVirtualMethods(kRuntimePointerSize)) {
       AssertMethod(&method);
       EXPECT_FALSE(method.IsDirect());
       EXPECT_EQ(klass.Get(), method.GetDeclaringClass());
     }
 
-    for (ArtMethod& method : klass->GetCopiedMethods(sizeof(void*))) {
+    for (ArtMethod& method : klass->GetCopiedMethods(kRuntimePointerSize)) {
       AssertMethod(&method);
       EXPECT_FALSE(method.IsDirect());
       EXPECT_TRUE(method.IsCopied());
@@ -435,7 +436,7 @@
     auto* resolved_methods = dex_cache->GetResolvedMethods();
     for (size_t i = 0, num_methods = dex_cache->NumResolvedMethods(); i != num_methods; ++i) {
       EXPECT_TRUE(
-          mirror::DexCache::GetElementPtrSize(resolved_methods, i, sizeof(void*)) != nullptr)
+          mirror::DexCache::GetElementPtrSize(resolved_methods, i, kRuntimePointerSize) != nullptr)
           << dex.GetLocation() << " i=" << i;
     }
   }
@@ -929,7 +930,7 @@
   // Static final primitives that are initialized by a compile-time constant
   // expression resolve to a copy of a constant value from the constant pool.
   // So <clinit> should be null.
-  ArtMethod* clinit = statics->FindDirectMethod("<clinit>", "()V", sizeof(void*));
+  ArtMethod* clinit = statics->FindDirectMethod("<clinit>", "()V", kRuntimePointerSize);
   EXPECT_TRUE(clinit == nullptr);
 
   EXPECT_EQ(9U, statics->NumStaticFields());
@@ -1016,15 +1017,15 @@
   EXPECT_TRUE(J->IsAssignableFrom(B.Get()));
 
   const Signature void_sig = I->GetDexCache()->GetDexFile()->CreateSignature("()V");
-  ArtMethod* Ii = I->FindVirtualMethod("i", void_sig, sizeof(void*));
-  ArtMethod* Jj1 = J->FindVirtualMethod("j1", void_sig, sizeof(void*));
-  ArtMethod* Jj2 = J->FindVirtualMethod("j2", void_sig, sizeof(void*));
-  ArtMethod* Kj1 = K->FindInterfaceMethod("j1", void_sig, sizeof(void*));
-  ArtMethod* Kj2 = K->FindInterfaceMethod("j2", void_sig, sizeof(void*));
-  ArtMethod* Kk = K->FindInterfaceMethod("k", void_sig, sizeof(void*));
-  ArtMethod* Ai = A->FindVirtualMethod("i", void_sig, sizeof(void*));
-  ArtMethod* Aj1 = A->FindVirtualMethod("j1", void_sig, sizeof(void*));
-  ArtMethod* Aj2 = A->FindVirtualMethod("j2", void_sig, sizeof(void*));
+  ArtMethod* Ii = I->FindVirtualMethod("i", void_sig, kRuntimePointerSize);
+  ArtMethod* Jj1 = J->FindVirtualMethod("j1", void_sig, kRuntimePointerSize);
+  ArtMethod* Jj2 = J->FindVirtualMethod("j2", void_sig, kRuntimePointerSize);
+  ArtMethod* Kj1 = K->FindInterfaceMethod("j1", void_sig, kRuntimePointerSize);
+  ArtMethod* Kj2 = K->FindInterfaceMethod("j2", void_sig, kRuntimePointerSize);
+  ArtMethod* Kk = K->FindInterfaceMethod("k", void_sig, kRuntimePointerSize);
+  ArtMethod* Ai = A->FindVirtualMethod("i", void_sig, kRuntimePointerSize);
+  ArtMethod* Aj1 = A->FindVirtualMethod("j1", void_sig, kRuntimePointerSize);
+  ArtMethod* Aj2 = A->FindVirtualMethod("j2", void_sig, kRuntimePointerSize);
   ASSERT_TRUE(Ii != nullptr);
   ASSERT_TRUE(Jj1 != nullptr);
   ASSERT_TRUE(Jj2 != nullptr);
@@ -1039,12 +1040,12 @@
   EXPECT_NE(Jj2, Aj2);
   EXPECT_EQ(Kj1, Jj1);
   EXPECT_EQ(Kj2, Jj2);
-  EXPECT_EQ(Ai, A->FindVirtualMethodForInterface(Ii, sizeof(void*)));
-  EXPECT_EQ(Aj1, A->FindVirtualMethodForInterface(Jj1, sizeof(void*)));
-  EXPECT_EQ(Aj2, A->FindVirtualMethodForInterface(Jj2, sizeof(void*)));
-  EXPECT_EQ(Ai, A->FindVirtualMethodForVirtualOrInterface(Ii, sizeof(void*)));
-  EXPECT_EQ(Aj1, A->FindVirtualMethodForVirtualOrInterface(Jj1, sizeof(void*)));
-  EXPECT_EQ(Aj2, A->FindVirtualMethodForVirtualOrInterface(Jj2, sizeof(void*)));
+  EXPECT_EQ(Ai, A->FindVirtualMethodForInterface(Ii, kRuntimePointerSize));
+  EXPECT_EQ(Aj1, A->FindVirtualMethodForInterface(Jj1, kRuntimePointerSize));
+  EXPECT_EQ(Aj2, A->FindVirtualMethodForInterface(Jj2, kRuntimePointerSize));
+  EXPECT_EQ(Ai, A->FindVirtualMethodForVirtualOrInterface(Ii, kRuntimePointerSize));
+  EXPECT_EQ(Aj1, A->FindVirtualMethodForVirtualOrInterface(Jj1, kRuntimePointerSize));
+  EXPECT_EQ(Aj2, A->FindVirtualMethodForVirtualOrInterface(Jj2, kRuntimePointerSize));
 
   ArtField* Afoo = mirror::Class::FindStaticField(soa.Self(), A, "foo", "Ljava/lang/String;");
   ArtField* Bfoo = mirror::Class::FindStaticField(soa.Self(), B, "foo", "Ljava/lang/String;");
@@ -1069,8 +1070,8 @@
   Handle<mirror::ClassLoader> class_loader(
       hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader)));
   mirror::Class* klass = class_linker_->FindClass(soa.Self(), "LStaticsFromCode;", class_loader);
-  ArtMethod* clinit = klass->FindClassInitializer(sizeof(void*));
-  ArtMethod* getS0 = klass->FindDirectMethod("getS0", "()Ljava/lang/Object;", sizeof(void*));
+  ArtMethod* clinit = klass->FindClassInitializer(kRuntimePointerSize);
+  ArtMethod* getS0 = klass->FindDirectMethod("getS0", "()Ljava/lang/Object;", kRuntimePointerSize);
   const DexFile::TypeId* type_id = dex_file->FindTypeId("LStaticsFromCode;");
   ASSERT_TRUE(type_id != nullptr);
   uint32_t type_idx = dex_file->GetIndexForTypeId(*type_id);
@@ -1134,19 +1135,19 @@
 
   c = class_linker_->FindClass(soa.Self(), "Ljava/lang/Class;", class_loader);
   ASSERT_TRUE(c != nullptr);
-  EXPECT_EQ(c->GetClassSize(), mirror::Class::ClassClassSize(sizeof(void*)));
+  EXPECT_EQ(c->GetClassSize(), mirror::Class::ClassClassSize(kRuntimePointerSize));
 
   c = class_linker_->FindClass(soa.Self(), "Ljava/lang/Object;", class_loader);
   ASSERT_TRUE(c != nullptr);
-  EXPECT_EQ(c->GetClassSize(), mirror::Object::ClassSize(sizeof(void*)));
+  EXPECT_EQ(c->GetClassSize(), mirror::Object::ClassSize(kRuntimePointerSize));
 
   c = class_linker_->FindClass(soa.Self(), "Ljava/lang/String;", class_loader);
   ASSERT_TRUE(c != nullptr);
-  EXPECT_EQ(c->GetClassSize(), mirror::String::ClassSize(sizeof(void*)));
+  EXPECT_EQ(c->GetClassSize(), mirror::String::ClassSize(kRuntimePointerSize));
 
   c = class_linker_->FindClass(soa.Self(), "Ljava/lang/DexCache;", class_loader);
   ASSERT_TRUE(c != nullptr);
-  EXPECT_EQ(c->GetClassSize(), mirror::DexCache::ClassSize(sizeof(void*)));
+  EXPECT_EQ(c->GetClassSize(), mirror::DexCache::ClassSize(kRuntimePointerSize));
 }
 
 static void CheckMethod(ArtMethod* method, bool verified)
@@ -1161,7 +1162,7 @@
     SHARED_REQUIRES(Locks::mutator_lock_) {
   EXPECT_EQ((c->GetAccessFlags() & kAccVerificationAttempted) != 0U, preverified)
       << "Class " << PrettyClass(c) << " not as expected";
-  for (auto& m : c->GetMethods(sizeof(void*))) {
+  for (auto& m : c->GetMethods(kRuntimePointerSize)) {
     CheckMethod(&m, preverified);
   }
 }
diff --git a/runtime/debugger.cc b/runtime/debugger.cc
index 5b54f7d..9f3ff3f 100644
--- a/runtime/debugger.cc
+++ b/runtime/debugger.cc
@@ -23,6 +23,7 @@
 #include "arch/context.h"
 #include "art_field-inl.h"
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/time_utils.h"
 #include "class_linker.h"
 #include "class_linker-inl.h"
@@ -79,7 +80,7 @@
     mirror::Class* declaring_class = m->GetDeclaringClass();
     return declaring_class->FindDeclaredVirtualMethod(declaring_class->GetDexCache(),
                                                       m->GetDexMethodIndex(),
-                                                      sizeof(void*));
+                                                      kRuntimePointerSize);
   }
 }
 
@@ -1406,7 +1407,7 @@
   if (m == nullptr) {
     return "null";
   }
-  return m->GetInterfaceMethodIfProxy(sizeof(void*))->GetName();
+  return m->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetName();
 }
 
 std::string Dbg::GetFieldName(JDWP::FieldId field_id) {
@@ -1526,9 +1527,9 @@
   auto ptr_size = cl->GetImagePointerSize();
   for (ArtMethod& m : c->GetMethods(ptr_size)) {
     expandBufAddMethodId(pReply, ToMethodId(&m));
-    expandBufAddUtf8String(pReply, m.GetInterfaceMethodIfProxy(sizeof(void*))->GetName());
-    expandBufAddUtf8String(pReply,
-                           m.GetInterfaceMethodIfProxy(sizeof(void*))->GetSignature().ToString());
+    expandBufAddUtf8String(pReply, m.GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetName());
+    expandBufAddUtf8String(
+        pReply, m.GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetSignature().ToString());
     if (with_generic) {
       const char* generic_signature = "";
       expandBufAddUtf8String(pReply, generic_signature);
@@ -3934,7 +3935,7 @@
           mirror::Class* parameter_type =
               m->GetClassFromTypeIndex(types->GetTypeItem(i).type_idx_,
                                        true /* resolve */,
-                                       sizeof(void*));
+                                       kRuntimePointerSize);
           mirror::Object* argument = gRegistry->Get<mirror::Object*>(arg_values[i], &error);
           if (error != JDWP::ERR_NONE) {
             return JDWP::ERR_INVALID_OBJECT;
@@ -4025,7 +4026,7 @@
 
   // Translate the method through the vtable, unless the debugger wants to suppress it.
   ArtMethod* m = pReq->method;
-  size_t image_pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+  PointerSize image_pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
   if ((pReq->options & JDWP::INVOKE_NONVIRTUAL) == 0 && pReq->receiver.Read() != nullptr) {
     ArtMethod* actual_method =
         pReq->klass.Read()->FindVirtualMethodForVirtualOrInterface(m, image_pointer_size);
@@ -5068,7 +5069,7 @@
   ReaderMutexLock mu(Thread::Current(), *Locks::breakpoint_lock_);
   BufferedRootVisitor<128> root_visitor(visitor, RootInfo(kRootVMInternal));
   for (Breakpoint& breakpoint : gBreakpoints) {
-    breakpoint.Method()->VisitRoots(root_visitor, sizeof(void*));
+    breakpoint.Method()->VisitRoots(root_visitor, kRuntimePointerSize);
   }
 }
 
diff --git a/runtime/dex_file.cc b/runtime/dex_file.cc
index 2a2d2c0..16087a5 100644
--- a/runtime/dex_file.cc
+++ b/runtime/dex_file.cc
@@ -29,6 +29,7 @@
 
 #include "art_field-inl.h"
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/file_magic.h"
 #include "base/hash_map.h"
 #include "base/logging.h"
@@ -1328,7 +1329,7 @@
   AnnotationValue annotation_value;
   StackHandleScope<2> hs(Thread::Current());
   Handle<mirror::Class> h_klass(hs.NewHandle(klass));
-  size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+  PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
   Handle<mirror::Class> return_type(hs.NewHandle(
       method->GetReturnType(true /* resolve */, pointer_size)));
   if (!ProcessAnnotationValue(h_klass, &annotation, &annotation_value, return_type, kAllObjects)) {
@@ -1620,12 +1621,12 @@
   Handle<mirror::String> string_name(
       hs.NewHandle(mirror::String::AllocFromModifiedUtf8(self, name)));
 
+  PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
   ArtMethod* annotation_method =
-      annotation_class->FindDeclaredVirtualMethodByName(name, sizeof(void*));
+      annotation_class->FindDeclaredVirtualMethodByName(name, pointer_size);
   if (annotation_method == nullptr) {
     return nullptr;
   }
-  size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
   Handle<mirror::Class> method_return(hs.NewHandle(
       annotation_method->GetReturnType(true /* resolve */, pointer_size)));
 
@@ -1640,11 +1641,12 @@
   Handle<mirror::Object> new_member(hs.NewHandle(annotation_member_class->AllocObject(self)));
   mirror::Method* method_obj_ptr;
   DCHECK(!Runtime::Current()->IsActiveTransaction());
-  if (pointer_size == 8U) {
-    method_obj_ptr = mirror::Method::CreateFromArtMethod<8U, false>(self, annotation_method);
+  if (pointer_size == PointerSize::k64) {
+    method_obj_ptr = mirror::Method::CreateFromArtMethod<PointerSize::k64, false>(
+        self, annotation_method);
   } else {
-    DCHECK_EQ(pointer_size, 4U);
-    method_obj_ptr = mirror::Method::CreateFromArtMethod<4U, false>(self, annotation_method);
+    method_obj_ptr = mirror::Method::CreateFromArtMethod<PointerSize::k32, false>(
+        self, annotation_method);
   }
   Handle<mirror::Method> method_object(hs.NewHandle(method_obj_ptr));
 
@@ -1960,22 +1962,24 @@
         if (method == nullptr) {
           return false;
         }
-        size_t pointer_size = class_linker->GetImagePointerSize();
+        PointerSize pointer_size = class_linker->GetImagePointerSize();
         set_object = true;
         DCHECK(!Runtime::Current()->IsActiveTransaction());
         if (method->IsConstructor()) {
-          if (pointer_size == 8U) {
-            element_object = mirror::Constructor::CreateFromArtMethod<8U, false>(self, method);
+          if (pointer_size == PointerSize::k64) {
+            element_object = mirror::Constructor::CreateFromArtMethod<PointerSize::k64,
+                                                                      false>(self, method);
           } else {
-            DCHECK_EQ(pointer_size, 4U);
-            element_object = mirror::Constructor::CreateFromArtMethod<4U, false>(self, method);
+            element_object = mirror::Constructor::CreateFromArtMethod<PointerSize::k32,
+                                                                      false>(self, method);
           }
         } else {
-          if (pointer_size == 8U) {
-            element_object = mirror::Method::CreateFromArtMethod<8U, false>(self, method);
+          if (pointer_size == PointerSize::k64) {
+            element_object = mirror::Method::CreateFromArtMethod<PointerSize::k64,
+                                                                 false>(self, method);
           } else {
-            DCHECK_EQ(pointer_size, 4U);
-            element_object = mirror::Method::CreateFromArtMethod<4U, false>(self, method);
+            element_object = mirror::Method::CreateFromArtMethod<PointerSize::k32,
+                                                                 false>(self, method);
           }
         }
         if (element_object == nullptr) {
@@ -1998,12 +2002,11 @@
           return false;
         }
         set_object = true;
-        size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
-        if (pointer_size == 8) {
-          element_object = mirror::Field::CreateFromArtField<8U>(self, field, true);
+        PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+        if (pointer_size == PointerSize::k64) {
+          element_object = mirror::Field::CreateFromArtField<PointerSize::k64>(self, field, true);
         } else {
-          DCHECK_EQ(pointer_size, 4U);
-          element_object = mirror::Field::CreateFromArtField<4U>(self, field, true);
+          element_object = mirror::Field::CreateFromArtField<PointerSize::k32>(self, field, true);
         }
         if (element_object == nullptr) {
           return false;
diff --git a/runtime/entrypoints/entrypoint_utils-inl.h b/runtime/entrypoints/entrypoint_utils-inl.h
index 7ecd595..204ba46 100644
--- a/runtime/entrypoints/entrypoint_utils-inl.h
+++ b/runtime/entrypoints/entrypoint_utils-inl.h
@@ -20,6 +20,7 @@
 #include "entrypoint_utils.h"
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "class_linker-inl.h"
 #include "common_throws.h"
 #include "dex_file.h"
@@ -52,7 +53,8 @@
   uint32_t method_index = inline_info.GetMethodIndexAtDepth(encoding, inlining_depth);
   InvokeType invoke_type = static_cast<InvokeType>(
         inline_info.GetInvokeTypeAtDepth(encoding, inlining_depth));
-  ArtMethod* inlined_method = outer_method->GetDexCacheResolvedMethod(method_index, sizeof(void*));
+  ArtMethod* inlined_method = outer_method->GetDexCacheResolvedMethod(method_index,
+                                                                      kRuntimePointerSize);
   if (!inlined_method->IsRuntimeMethod()) {
     return inlined_method;
   }
@@ -89,7 +91,7 @@
         Runtime::Current()->GetClassLinker()->GetClassRoot(ClassLinker::kJavaLangString);
     // Update the dex cache for future lookups.
     caller->GetDexCache()->SetResolvedType(method_id.class_idx_, cls);
-    inlined_method = cls->FindVirtualMethod("charAt", "(I)C", sizeof(void*));
+    inlined_method = cls->FindVirtualMethod("charAt", "(I)C", kRuntimePointerSize);
   } else {
     mirror::Class* klass = caller->GetDexCache()->GetResolvedType(method_id.class_idx_);
     DCHECK_EQ(klass->GetDexCache(), caller->GetDexCache())
@@ -98,12 +100,12 @@
       case kDirect:
       case kStatic:
         inlined_method =
-            klass->FindDirectMethod(klass->GetDexCache(), method_index, sizeof(void*));
+            klass->FindDirectMethod(klass->GetDexCache(), method_index, kRuntimePointerSize);
         break;
       case kSuper:
       case kVirtual:
         inlined_method =
-            klass->FindVirtualMethod(klass->GetDexCache(), method_index, sizeof(void*));
+            klass->FindVirtualMethod(klass->GetDexCache(), method_index, kRuntimePointerSize);
         break;
       default:
         LOG(FATAL) << "Unimplemented inlined invocation type: " << invoke_type;
@@ -114,7 +116,7 @@
   // Update the dex cache for future lookups. Note that for static methods, this is safe
   // when the class is being initialized, as the entrypoint for the ArtMethod is at
   // this point still the resolution trampoline.
-  outer_method->SetDexCacheResolvedMethod(method_index, inlined_method, sizeof(void*));
+  outer_method->SetDexCacheResolvedMethod(method_index, inlined_method, kRuntimePointerSize);
   return inlined_method;
 }
 
@@ -130,7 +132,7 @@
                                        ArtMethod* method,
                                        Thread* self, bool* slow_path) {
   ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
-  size_t pointer_size = class_linker->GetImagePointerSize();
+  PointerSize pointer_size = class_linker->GetImagePointerSize();
   mirror::Class* klass = method->GetDexCacheResolvedType<false>(type_idx, pointer_size);
   if (UNLIKELY(klass == nullptr)) {
     klass = class_linker->ResolveType(type_idx, method);
@@ -275,7 +277,7 @@
     return nullptr;  // Failure
   }
   ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
-  size_t pointer_size = class_linker->GetImagePointerSize();
+  PointerSize pointer_size = class_linker->GetImagePointerSize();
   mirror::Class* klass = method->GetDexCacheResolvedType<false>(type_idx, pointer_size);
   if (UNLIKELY(klass == nullptr)) {  // Not in dex cache so try to resolve
     klass = class_linker->ResolveType(type_idx, method);
@@ -381,7 +383,7 @@
     //
     // In particular, don't assume the dex instruction already correctly knows if the
     // real field is static or not. The resolution must not be aware of this.
-    ArtMethod* method = referrer->GetInterfaceMethodIfProxy(sizeof(void*));
+    ArtMethod* method = referrer->GetInterfaceMethodIfProxy(kRuntimePointerSize);
 
     StackHandleScope<2> hs(self);
     Handle<mirror::DexCache> h_dex_cache(hs.NewHandle(method->GetDexCache()));
@@ -601,7 +603,7 @@
     }
     case kInterface: {
       uint32_t imt_index = resolved_method->GetImtIndex();
-      size_t pointer_size = class_linker->GetImagePointerSize();
+      PointerSize pointer_size = class_linker->GetImagePointerSize();
       ArtMethod* imt_method = (*this_object)->GetClass()->GetImt(pointer_size)->
           Get(imt_index, pointer_size);
       if (!imt_method->IsRuntimeMethod()) {
@@ -655,7 +657,8 @@
 inline ArtField* FindFieldFast(uint32_t field_idx, ArtMethod* referrer, FindFieldType type,
                                size_t expected_size) {
   ArtField* resolved_field =
-      referrer->GetDeclaringClass()->GetDexCache()->GetResolvedField(field_idx, sizeof(void*));
+      referrer->GetDeclaringClass()->GetDexCache()->GetResolvedField(field_idx,
+                                                                     kRuntimePointerSize);
   if (UNLIKELY(resolved_field == nullptr)) {
     return nullptr;
   }
@@ -710,7 +713,7 @@
   }
   mirror::Class* referring_class = referrer->GetDeclaringClass();
   ArtMethod* resolved_method =
-      referring_class->GetDexCache()->GetResolvedMethod(method_idx, sizeof(void*));
+      referring_class->GetDexCache()->GetResolvedMethod(method_idx, kRuntimePointerSize);
   if (UNLIKELY(resolved_method == nullptr)) {
     return nullptr;
   }
@@ -729,7 +732,8 @@
     }
   }
   if (type == kInterface) {  // Most common form of slow path dispatch.
-    return this_object->GetClass()->FindVirtualMethodForInterface(resolved_method, sizeof(void*));
+    return this_object->GetClass()->FindVirtualMethodForInterface(resolved_method,
+                                                                  kRuntimePointerSize);
   } else if (type == kStatic || type == kDirect) {
     return resolved_method;
   } else if (type == kSuper) {
@@ -752,15 +756,15 @@
         // The super class does not have the method.
         return nullptr;
       }
-      return super_class->GetVTableEntry(resolved_method->GetMethodIndex(), sizeof(void*));
+      return super_class->GetVTableEntry(resolved_method->GetMethodIndex(), kRuntimePointerSize);
     } else {
       return method_reference_class->FindVirtualMethodForInterfaceSuper(
-          resolved_method, sizeof(void*));
+          resolved_method, kRuntimePointerSize);
     }
   } else {
     DCHECK(type == kVirtual);
     return this_object->GetClass()->GetVTableEntry(
-        resolved_method->GetMethodIndex(), sizeof(void*));
+        resolved_method->GetMethodIndex(), kRuntimePointerSize);
   }
 }
 
diff --git a/runtime/entrypoints/entrypoint_utils.cc b/runtime/entrypoints/entrypoint_utils.cc
index 197caa1..fd1c02f 100644
--- a/runtime/entrypoints/entrypoint_utils.cc
+++ b/runtime/entrypoints/entrypoint_utils.cc
@@ -18,6 +18,7 @@
 
 #include "art_field-inl.h"
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/mutex.h"
 #include "class_linker-inl.h"
 #include "dex_file-inl.h"
@@ -48,7 +49,7 @@
     return nullptr;  // Failure
   }
   ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
-  size_t pointer_size = class_linker->GetImagePointerSize();
+  PointerSize pointer_size = class_linker->GetImagePointerSize();
   mirror::Class* klass = referrer->GetDexCacheResolvedType<false>(type_idx, pointer_size);
   if (UNLIKELY(klass == nullptr)) {  // Not in dex cache so try to resolve
     klass = class_linker->ResolveType(type_idx, referrer);
@@ -125,7 +126,7 @@
   }
   // Make sure that the result is an instance of the type this method was expected to return.
   mirror::Class* return_type = self->GetCurrentMethod(nullptr)->GetReturnType(true /* resolve */,
-                                                                              sizeof(void*));
+                                                                              kRuntimePointerSize);
 
   if (!o->InstanceOf(return_type)) {
     Runtime::Current()->GetJavaVM()->JniAbortF(nullptr,
@@ -188,7 +189,7 @@
       StackHandleScope<1> hs(soa.Self());
       auto h_interface_method(hs.NewHandle(soa.Decode<mirror::Method*>(interface_method_jobj)));
       // This can cause thread suspension.
-      size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+      PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
       mirror::Class* result_type =
           h_interface_method->GetArtMethod()->GetReturnType(true /* resolve */, pointer_size);
       mirror::Object* result_ref = soa.Decode<mirror::Object*>(result);
@@ -208,10 +209,10 @@
       mirror::Class* proxy_class = rcvr->GetClass();
       mirror::Method* interface_method = soa.Decode<mirror::Method*>(interface_method_jobj);
       ArtMethod* proxy_method = rcvr->GetClass()->FindVirtualMethodForInterface(
-          interface_method->GetArtMethod(), sizeof(void*));
-      auto virtual_methods = proxy_class->GetVirtualMethodsSlice(sizeof(void*));
+          interface_method->GetArtMethod(), kRuntimePointerSize);
+      auto virtual_methods = proxy_class->GetVirtualMethodsSlice(kRuntimePointerSize);
       size_t num_virtuals = proxy_class->NumVirtualMethods();
-      size_t method_size = ArtMethod::Size(sizeof(void*));
+      size_t method_size = ArtMethod::Size(kRuntimePointerSize);
       // Rely on the fact that the methods are contiguous to determine the index of the method in
       // the slice.
       int throws_index = (reinterpret_cast<uintptr_t>(proxy_method) -
diff --git a/runtime/entrypoints/quick/callee_save_frame.h b/runtime/entrypoints/quick/callee_save_frame.h
index 331de91..a81a7e7 100644
--- a/runtime/entrypoints/quick/callee_save_frame.h
+++ b/runtime/entrypoints/quick/callee_save_frame.h
@@ -18,6 +18,7 @@
 #define ART_RUNTIME_ENTRYPOINTS_QUICK_CALLEE_SAVE_FRAME_H_
 
 #include "arch/instruction_set.h"
+#include "base/enums.h"
 #include "base/mutex.h"
 #include "runtime.h"
 #include "thread-inl.h"
@@ -86,7 +87,7 @@
 }
 
 // Note: this specialized statement is sanity-checked in the quick-trampoline gtest.
-static constexpr size_t GetConstExprPointerSize(InstructionSet isa) {
+static constexpr PointerSize GetConstExprPointerSize(InstructionSet isa) {
   // constexpr must be a return statement.
   return (isa == kArm || isa == kThumb2) ? kArmPointerSize :
          isa == kArm64 ? kArm64PointerSize :
@@ -94,14 +95,14 @@
          isa == kMips64 ? kMips64PointerSize :
          isa == kX86 ? kX86PointerSize :
          isa == kX86_64 ? kX86_64PointerSize :
-         isa == kNone ? (LOG(FATAL) << "kNone has no pointer size", 0) :
-         (LOG(FATAL) << "Unknown instruction set" << isa, 0);
+         isa == kNone ? (LOG(FATAL) << "kNone has no pointer size", PointerSize::k32) :
+         (LOG(FATAL) << "Unknown instruction set" << isa, PointerSize::k32);
 }
 
 // Note: this specialized statement is sanity-checked in the quick-trampoline gtest.
 static constexpr size_t GetCalleeSaveReturnPcOffset(InstructionSet isa,
                                                     Runtime::CalleeSaveType type) {
-  return GetCalleeSaveFrameSize(isa, type) - GetConstExprPointerSize(isa);
+  return GetCalleeSaveFrameSize(isa, type) - static_cast<size_t>(GetConstExprPointerSize(isa));
 }
 
 }  // namespace art
diff --git a/runtime/entrypoints/quick/quick_alloc_entrypoints.cc b/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
index c3b3ac0..4686a51 100644
--- a/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
@@ -17,6 +17,7 @@
 #include "entrypoints/quick/quick_alloc_entrypoints.h"
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "callee_save_frame.h"
 #include "entrypoints/entrypoint_utils-inl.h"
 #include "mirror/class-inl.h"
@@ -33,7 +34,7 @@
     SHARED_REQUIRES(Locks::mutator_lock_) { \
   ScopedQuickEntrypointChecks sqec(self); \
   if (kUseTlabFastPath && !(instrumented_bool) && (allocator_type) == gc::kAllocatorTypeTLAB) { \
-    mirror::Class* klass = method->GetDexCacheResolvedType<false>(type_idx, sizeof(void*)); \
+    mirror::Class* klass = method->GetDexCacheResolvedType<false>(type_idx, kRuntimePointerSize); \
     if (LIKELY(klass != nullptr && klass->IsInitialized() && !klass->IsFinalizable())) { \
       size_t byte_count = klass->GetObjectSize(); \
       byte_count = RoundUp(byte_count, gc::space::BumpPointerSpace::kAlignment); \
diff --git a/runtime/entrypoints/quick/quick_entrypoints_enum.h b/runtime/entrypoints/quick/quick_entrypoints_enum.h
index 5a95491..8de1137 100644
--- a/runtime/entrypoints/quick/quick_entrypoints_enum.h
+++ b/runtime/entrypoints/quick/quick_entrypoints_enum.h
@@ -36,7 +36,7 @@
 std::ostream& operator<<(std::ostream& os, const QuickEntrypointEnum& kind);
 
 // Translate a QuickEntrypointEnum value to the corresponding ThreadOffset.
-template <size_t pointer_size>
+template <PointerSize pointer_size>
 static ThreadOffset<pointer_size> GetThreadOffset(QuickEntrypointEnum trampoline) {
   switch (trampoline)
   {  // NOLINT(whitespace/braces)
diff --git a/runtime/entrypoints/quick/quick_instrumentation_entrypoints.cc b/runtime/entrypoints/quick/quick_instrumentation_entrypoints.cc
index 8e660a2..b5e560f 100644
--- a/runtime/entrypoints/quick/quick_instrumentation_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_instrumentation_entrypoints.cc
@@ -15,6 +15,7 @@
  */
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "callee_save_frame.h"
 #include "entrypoints/runtime_asm_entrypoints.h"
 #include "instrumentation.h"
@@ -37,7 +38,7 @@
   if (instrumentation->IsDeoptimized(method)) {
     result = GetQuickToInterpreterBridge();
   } else {
-    result = instrumentation->GetQuickCodeFor(method, sizeof(void*));
+    result = instrumentation->GetQuickCodeFor(method, kRuntimePointerSize);
     DCHECK(!Runtime::Current()->GetClassLinker()->IsQuickToInterpreterBridge(result));
   }
   bool interpreter_entry = (result == GetQuickToInterpreterBridge());
diff --git a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
index 0306bd6..9678079 100644
--- a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
@@ -15,6 +15,7 @@
  */
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "callee_save_frame.h"
 #include "common_throws.h"
 #include "dex_file-inl.h"
@@ -366,7 +367,7 @@
     // next register is even.
     static_assert(!kQuickDoubleRegAlignedFloatBackFilled || kNumQuickFprArgs % 2 == 0,
                   "Number of Quick FPR arguments not even");
-    DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), sizeof(void*));
+    DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
   }
 
   virtual ~QuickArgumentVisitor() {}
@@ -659,7 +660,7 @@
 
   DCHECK(!method->IsNative()) << PrettyMethod(method);
   uint32_t shorty_len = 0;
-  ArtMethod* non_proxy_method = method->GetInterfaceMethodIfProxy(sizeof(void*));
+  ArtMethod* non_proxy_method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
   const DexFile::CodeItem* code_item = non_proxy_method->GetCodeItem();
   DCHECK(code_item != nullptr) << PrettyMethod(method);
   const char* shorty = non_proxy_method->GetShorty(&shorty_len);
@@ -859,7 +860,7 @@
   jobject rcvr_jobj = soa.AddLocalReference<jobject>(receiver);
 
   // Placing arguments into args vector and remove the receiver.
-  ArtMethod* non_proxy_method = proxy_method->GetInterfaceMethodIfProxy(sizeof(void*));
+  ArtMethod* non_proxy_method = proxy_method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
   CHECK(!non_proxy_method->IsStatic()) << PrettyMethod(proxy_method) << " "
                                        << PrettyMethod(non_proxy_method);
   std::vector<jvalue> args;
@@ -872,14 +873,15 @@
   args.erase(args.begin());
 
   // Convert proxy method into expected interface method.
-  ArtMethod* interface_method = proxy_method->FindOverriddenMethod(sizeof(void*));
+  ArtMethod* interface_method = proxy_method->FindOverriddenMethod(kRuntimePointerSize);
   DCHECK(interface_method != nullptr) << PrettyMethod(proxy_method);
   DCHECK(!interface_method->IsProxyMethod()) << PrettyMethod(interface_method);
   self->EndAssertNoThreadSuspension(old_cause);
-  DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), sizeof(void*));
+  DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
   DCHECK(!Runtime::Current()->IsActiveTransaction());
   jobject interface_method_jobj = soa.AddLocalReference<jobject>(
-      mirror::Method::CreateFromArtMethod<sizeof(void*), false>(soa.Self(), interface_method));
+      mirror::Method::CreateFromArtMethod<kRuntimePointerSize, false>(soa.Self(),
+                                                                      interface_method));
 
   // All naked Object*s should now be in jobjects, so its safe to go into the main invoke code
   // that performs allocations.
@@ -1037,10 +1039,10 @@
       ArtMethod* orig_called = called;
       if (invoke_type == kVirtual) {
         CHECK(receiver != nullptr) << invoke_type;
-        called = receiver->GetClass()->FindVirtualMethodForVirtual(called, sizeof(void*));
+        called = receiver->GetClass()->FindVirtualMethodForVirtual(called, kRuntimePointerSize);
       } else if (invoke_type == kInterface) {
         CHECK(receiver != nullptr) << invoke_type;
-        called = receiver->GetClass()->FindVirtualMethodForInterface(called, sizeof(void*));
+        called = receiver->GetClass()->FindVirtualMethodForInterface(called, kRuntimePointerSize);
       } else {
         DCHECK_EQ(invoke_type, kSuper);
         CHECK(caller != nullptr) << invoke_type;
@@ -1053,10 +1055,10 @@
         mirror::Class* ref_class = linker->ResolveReferencedClassOfMethod(
             called_method.dex_method_index, dex_cache, class_loader);
         if (ref_class->IsInterface()) {
-          called = ref_class->FindVirtualMethodForInterfaceSuper(called, sizeof(void*));
+          called = ref_class->FindVirtualMethodForInterfaceSuper(called, kRuntimePointerSize);
         } else {
           called = caller->GetDeclaringClass()->GetSuperClass()->GetVTableEntry(
-              called->GetMethodIndex(), sizeof(void*));
+              called->GetMethodIndex(), kRuntimePointerSize);
         }
       }
 
@@ -1070,7 +1072,7 @@
       // FindVirtualMethodFor... This is ok for FindDexMethodIndexInOtherDexFile that only cares
       // about the name and signature.
       uint32_t update_dex_cache_method_index = called->GetDexMethodIndex();
-      if (!called->HasSameDexCacheResolvedMethods(caller, sizeof(void*))) {
+      if (!called->HasSameDexCacheResolvedMethods(caller, kRuntimePointerSize)) {
         // Calling from one dex file to another, need to compute the method index appropriate to
         // the caller's dex file. Since we get here only if the original called was a runtime
         // method, we've got the correct dex_file and a dex_method_idx from above.
@@ -1084,8 +1086,10 @@
       }
       if ((update_dex_cache_method_index != DexFile::kDexNoIndex) &&
           (caller->GetDexCacheResolvedMethod(
-              update_dex_cache_method_index, sizeof(void*)) != called)) {
-        caller->SetDexCacheResolvedMethod(update_dex_cache_method_index, called, sizeof(void*));
+              update_dex_cache_method_index, kRuntimePointerSize) != called)) {
+        caller->SetDexCacheResolvedMethod(update_dex_cache_method_index,
+                                          called,
+                                          kRuntimePointerSize);
       }
     } else if (invoke_type == kStatic) {
       const auto called_dex_method_idx = called->GetDexMethodIndex();
@@ -1095,7 +1099,9 @@
       // b/19175856
       if (called->GetDexFile() == called_method.dex_file &&
           called_method.dex_method_index != called_dex_method_idx) {
-        called->GetDexCache()->SetResolvedMethod(called_dex_method_idx, called, sizeof(void*));
+        called->GetDexCache()->SetResolvedMethod(called_dex_method_idx,
+                                                 called,
+                                                 kRuntimePointerSize);
       }
     }
 
@@ -1629,7 +1635,7 @@
       SHARED_REQUIRES(Locks::mutator_lock_) {
     ArtMethod* method = **m;
 
-    DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), sizeof(void*));
+    DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
 
     uint8_t* sp8 = reinterpret_cast<uint8_t*>(sp);
 
@@ -2164,22 +2170,22 @@
   }
 
   ArtMethod* interface_method = caller_method->GetDexCacheResolvedMethod(
-      dex_method_idx, sizeof(void*));
+      dex_method_idx, kRuntimePointerSize);
   DCHECK(interface_method != nullptr) << dex_method_idx << " " << PrettyMethod(caller_method);
   ArtMethod* method = nullptr;
-  ImTable* imt = cls->GetImt(sizeof(void*));
+  ImTable* imt = cls->GetImt(kRuntimePointerSize);
 
   if (LIKELY(interface_method->GetDexMethodIndex() != DexFile::kDexNoIndex)) {
     // If the dex cache already resolved the interface method, look whether we have
     // a match in the ImtConflictTable.
-    ArtMethod* conflict_method = imt->Get(interface_method->GetImtIndex(), sizeof(void*));
+    ArtMethod* conflict_method = imt->Get(interface_method->GetImtIndex(), kRuntimePointerSize);
     if (LIKELY(conflict_method->IsRuntimeMethod())) {
-      ImtConflictTable* current_table = conflict_method->GetImtConflictTable(sizeof(void*));
+      ImtConflictTable* current_table = conflict_method->GetImtConflictTable(kRuntimePointerSize);
       DCHECK(current_table != nullptr);
-      method = current_table->Lookup(interface_method, sizeof(void*));
+      method = current_table->Lookup(interface_method, kRuntimePointerSize);
     } else {
       // It seems we aren't really a conflict method!
-      method = cls->FindVirtualMethodForInterface(interface_method, sizeof(void*));
+      method = cls->FindVirtualMethodForInterface(interface_method, kRuntimePointerSize);
     }
     if (method != nullptr) {
       return GetTwoWordSuccessValue(
@@ -2188,7 +2194,7 @@
     }
 
     // No match, use the IfTable.
-    method = cls->FindVirtualMethodForInterface(interface_method, sizeof(void*));
+    method = cls->FindVirtualMethodForInterface(interface_method, kRuntimePointerSize);
     if (UNLIKELY(method == nullptr)) {
       ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch(
           interface_method, this_object, caller_method);
@@ -2217,14 +2223,15 @@
       CHECK(self->IsExceptionPending());
       return GetTwoWordFailureValue();  // Failure.
     }
-    interface_method = caller_method->GetDexCacheResolvedMethod(dex_method_idx, sizeof(void*));
+    interface_method =
+        caller_method->GetDexCacheResolvedMethod(dex_method_idx, kRuntimePointerSize);
     DCHECK(!interface_method->IsRuntimeMethod());
   }
 
   // We arrive here if we have found an implementation, and it is not in the ImtConflictTable.
   // We create a new table with the new pair { interface_method, method }.
   uint32_t imt_index = interface_method->GetImtIndex();
-  ArtMethod* conflict_method = imt->Get(imt_index, sizeof(void*));
+  ArtMethod* conflict_method = imt->Get(imt_index, kRuntimePointerSize);
   if (conflict_method->IsRuntimeMethod()) {
     ArtMethod* new_conflict_method = Runtime::Current()->GetClassLinker()->AddMethodToConflictTable(
         cls.Get(),
@@ -2237,7 +2244,7 @@
       // data is consistent.
       imt->Set(imt_index,
                new_conflict_method,
-               sizeof(void*));
+               kRuntimePointerSize);
     }
   }
 
diff --git a/runtime/fault_handler.cc b/runtime/fault_handler.cc
index 9f073a6..f86921c 100644
--- a/runtime/fault_handler.cc
+++ b/runtime/fault_handler.cc
@@ -341,7 +341,7 @@
   // If we don't have a potential method, we're outta here.
   VLOG(signals) << "potential method: " << method_obj;
   // TODO: Check linear alloc and image.
-  DCHECK_ALIGNED(ArtMethod::Size(sizeof(void*)), sizeof(void*))
+  DCHECK_ALIGNED(ArtMethod::Size(kRuntimePointerSize), sizeof(void*))
       << "ArtMethod is not pointer aligned";
   if (method_obj == nullptr || !IsAligned<sizeof(void*)>(method_obj)) {
     VLOG(signals) << "no method";
diff --git a/runtime/gc/allocation_record.cc b/runtime/gc/allocation_record.cc
index 6489a39..522f236 100644
--- a/runtime/gc/allocation_record.cc
+++ b/runtime/gc/allocation_record.cc
@@ -17,6 +17,7 @@
 #include "allocation_record.h"
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/stl_util.h"
 #include "stack.h"
 
@@ -112,7 +113,7 @@
     for (size_t i = 0, depth = record.GetDepth(); i < depth; ++i) {
       const AllocRecordStackTraceElement& element = record.StackElement(i);
       DCHECK(element.GetMethod() != nullptr);
-      element.GetMethod()->VisitRoots(buffered_visitor, sizeof(void*));
+      element.GetMethod()->VisitRoots(buffered_visitor, kRuntimePointerSize);
     }
   }
 }
@@ -200,7 +201,7 @@
     ArtMethod* m = GetMethod();
     // m may be null if we have inlined methods of unresolved classes. b/27858645
     if (m != nullptr && !m->IsRuntimeMethod()) {
-      m = m->GetInterfaceMethodIfProxy(sizeof(void*));
+      m = m->GetInterfaceMethodIfProxy(kRuntimePointerSize);
       trace_->AddStackElement(AllocRecordStackTraceElement(m, GetDexPc()));
     }
     return true;
diff --git a/runtime/gc/collector/concurrent_copying.cc b/runtime/gc/collector/concurrent_copying.cc
index 90446b0..33f64d9 100644
--- a/runtime/gc/collector/concurrent_copying.cc
+++ b/runtime/gc/collector/concurrent_copying.cc
@@ -17,6 +17,7 @@
 #include "concurrent_copying.h"
 
 #include "art_field-inl.h"
+#include "base/enums.h"
 #include "base/histogram-inl.h"
 #include "base/stl_util.h"
 #include "base/systrace.h"
@@ -1588,7 +1589,7 @@
         ArtMethod* method = gc_root_source->GetArtMethod();
         LOG(INTERNAL_FATAL) << "gc root in method " << method << " " << PrettyMethod(method);
         RootPrinter root_printer;
-        method->VisitRoots(root_printer, sizeof(void*));
+        method->VisitRoots(root_printer, kRuntimePointerSize);
       }
       ref->GetLockWord(false).Dump(LOG(INTERNAL_FATAL));
       region_space_->DumpNonFreeRegions(LOG(INTERNAL_FATAL));
diff --git a/runtime/gc/collector/mark_sweep.cc b/runtime/gc/collector/mark_sweep.cc
index 9f54f1c..e276137 100644
--- a/runtime/gc/collector/mark_sweep.cc
+++ b/runtime/gc/collector/mark_sweep.cc
@@ -23,6 +23,7 @@
 #include <vector>
 
 #include "base/bounded_fifo.h"
+#include "base/enums.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/mutex-inl.h"
@@ -430,7 +431,7 @@
                             << " first_ref_field_offset="
                             << (holder_->IsClass()
                                 ? holder_->AsClass()->GetFirstReferenceStaticFieldOffset(
-                                    sizeof(void*))
+                                    kRuntimePointerSize)
                                 : holder_->GetClass()->GetFirstReferenceInstanceFieldOffset())
                             << " num_of_ref_fields="
                             << (holder_->IsClass()
diff --git a/runtime/gc/space/image_space.cc b/runtime/gc/space/image_space.cc
index 8cadc2e..d140b75 100644
--- a/runtime/gc/space/image_space.cc
+++ b/runtime/gc/space/image_space.cc
@@ -23,6 +23,7 @@
 #include <unistd.h>
 
 #include "art_method.h"
+#include "base/enums.h"
 #include "base/macros.h"
 #include "base/stl_util.h"
 #include "base/scoped_flock.h"
@@ -754,7 +755,7 @@
  public:
   template<typename... Args>
   explicit FixupObjectVisitor(gc::accounting::ContinuousSpaceBitmap* visited,
-                              const size_t pointer_size,
+                              const PointerSize pointer_size,
                               Args... args)
       : FixupVisitor(args...),
         pointer_size_(pointer_size),
@@ -874,7 +875,7 @@
   }
 
  private:
-  const size_t pointer_size_;
+  const PointerSize pointer_size_;
   gc::accounting::ContinuousSpaceBitmap* const visited_;
 };
 
@@ -908,7 +909,7 @@
 class FixupArtMethodVisitor : public FixupVisitor, public ArtMethodVisitor {
  public:
   template<typename... Args>
-  explicit FixupArtMethodVisitor(bool fixup_heap_objects, size_t pointer_size, Args... args)
+  explicit FixupArtMethodVisitor(bool fixup_heap_objects, PointerSize pointer_size, Args... args)
       : FixupVisitor(args...),
         fixup_heap_objects_(fixup_heap_objects),
         pointer_size_(pointer_size) {}
@@ -938,7 +939,7 @@
 
  private:
   const bool fixup_heap_objects_;
-  const size_t pointer_size_;
+  const PointerSize pointer_size_;
 };
 
 class FixupArtFieldVisitor : public FixupVisitor, public ArtFieldVisitor {
@@ -974,7 +975,7 @@
   uint32_t boot_image_end = 0;
   uint32_t boot_oat_begin = 0;
   uint32_t boot_oat_end = 0;
-  const size_t pointer_size = image_header.GetPointerSize();
+  const PointerSize pointer_size = image_header.GetPointerSize();
   gc::Heap* const heap = Runtime::Current()->GetHeap();
   heap->GetBootImagesSize(&boot_image_begin, &boot_image_end, &boot_oat_begin, &boot_oat_end);
   if (boot_image_begin == boot_image_end) {
diff --git a/runtime/generated/asm_support_gen.h b/runtime/generated/asm_support_gen.h
index f1a3256..5d62b59 100644
--- a/runtime/generated/asm_support_gen.h
+++ b/runtime/generated/asm_support_gen.h
@@ -33,13 +33,13 @@
 #define RUNTIME_REFS_AND_ARGS_CALLEE_SAVE_FRAME_OFFSET 0x10
 DEFINE_CHECK_EQ(static_cast<size_t>(RUNTIME_REFS_AND_ARGS_CALLEE_SAVE_FRAME_OFFSET), (static_cast<size_t>(art::Runtime::GetCalleeSaveMethodOffset(art::Runtime:: kRefsAndArgs))))
 #define THREAD_FLAGS_OFFSET 0
-DEFINE_CHECK_EQ(static_cast<int32_t>(THREAD_FLAGS_OFFSET), (static_cast<int32_t>(art::Thread:: ThreadFlagsOffset<sizeof(void*)>().Int32Value())))
+DEFINE_CHECK_EQ(static_cast<int32_t>(THREAD_FLAGS_OFFSET), (static_cast<int32_t>(art::Thread:: ThreadFlagsOffset<art::kRuntimePointerSize>().Int32Value())))
 #define THREAD_ID_OFFSET 12
-DEFINE_CHECK_EQ(static_cast<int32_t>(THREAD_ID_OFFSET), (static_cast<int32_t>(art::Thread:: ThinLockIdOffset<sizeof(void*)>().Int32Value())))
+DEFINE_CHECK_EQ(static_cast<int32_t>(THREAD_ID_OFFSET), (static_cast<int32_t>(art::Thread:: ThinLockIdOffset<art::kRuntimePointerSize>().Int32Value())))
 #define THREAD_IS_GC_MARKING_OFFSET 52
-DEFINE_CHECK_EQ(static_cast<int32_t>(THREAD_IS_GC_MARKING_OFFSET), (static_cast<int32_t>(art::Thread:: IsGcMarkingOffset<sizeof(void*)>().Int32Value())))
+DEFINE_CHECK_EQ(static_cast<int32_t>(THREAD_IS_GC_MARKING_OFFSET), (static_cast<int32_t>(art::Thread:: IsGcMarkingOffset<art::kRuntimePointerSize>().Int32Value())))
 #define THREAD_CARD_TABLE_OFFSET 128
-DEFINE_CHECK_EQ(static_cast<int32_t>(THREAD_CARD_TABLE_OFFSET), (static_cast<int32_t>(art::Thread:: CardTableOffset<sizeof(void*)>().Int32Value())))
+DEFINE_CHECK_EQ(static_cast<int32_t>(THREAD_CARD_TABLE_OFFSET), (static_cast<int32_t>(art::Thread:: CardTableOffset<art::kRuntimePointerSize>().Int32Value())))
 #define CODEITEM_INSNS_OFFSET 16
 DEFINE_CHECK_EQ(static_cast<int32_t>(CODEITEM_INSNS_OFFSET), (static_cast<int32_t>(__builtin_offsetof(art::DexFile::CodeItem, insns_))))
 #define MIRROR_OBJECT_CLASS_OFFSET 0
@@ -53,21 +53,21 @@
 #define ACCESS_FLAGS_CLASS_IS_FINALIZABLE_BIT 0x1f
 DEFINE_CHECK_EQ(static_cast<uint32_t>(ACCESS_FLAGS_CLASS_IS_FINALIZABLE_BIT), (static_cast<uint32_t>((art::MostSignificantBit(art::kAccClassIsFinalizable)))))
 #define ART_METHOD_DEX_CACHE_METHODS_OFFSET_32 20
-DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_DEX_CACHE_METHODS_OFFSET_32), (static_cast<int32_t>(art::ArtMethod:: DexCacheResolvedMethodsOffset(4).Int32Value())))
+DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_DEX_CACHE_METHODS_OFFSET_32), (static_cast<int32_t>(art::ArtMethod:: DexCacheResolvedMethodsOffset(art::PointerSize::k32).Int32Value())))
 #define ART_METHOD_DEX_CACHE_METHODS_OFFSET_64 24
-DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_DEX_CACHE_METHODS_OFFSET_64), (static_cast<int32_t>(art::ArtMethod:: DexCacheResolvedMethodsOffset(8).Int32Value())))
+DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_DEX_CACHE_METHODS_OFFSET_64), (static_cast<int32_t>(art::ArtMethod:: DexCacheResolvedMethodsOffset(art::PointerSize::k64).Int32Value())))
 #define ART_METHOD_DEX_CACHE_TYPES_OFFSET_32 24
-DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_DEX_CACHE_TYPES_OFFSET_32), (static_cast<int32_t>(art::ArtMethod:: DexCacheResolvedTypesOffset(4).Int32Value())))
+DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_DEX_CACHE_TYPES_OFFSET_32), (static_cast<int32_t>(art::ArtMethod:: DexCacheResolvedTypesOffset(art::PointerSize::k32).Int32Value())))
 #define ART_METHOD_DEX_CACHE_TYPES_OFFSET_64 32
-DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_DEX_CACHE_TYPES_OFFSET_64), (static_cast<int32_t>(art::ArtMethod:: DexCacheResolvedTypesOffset(8).Int32Value())))
+DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_DEX_CACHE_TYPES_OFFSET_64), (static_cast<int32_t>(art::ArtMethod:: DexCacheResolvedTypesOffset(art::PointerSize::k64).Int32Value())))
 #define ART_METHOD_JNI_OFFSET_32 28
-DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_JNI_OFFSET_32), (static_cast<int32_t>(art::ArtMethod:: EntryPointFromJniOffset(4).Int32Value())))
+DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_JNI_OFFSET_32), (static_cast<int32_t>(art::ArtMethod:: EntryPointFromJniOffset(art::PointerSize::k32).Int32Value())))
 #define ART_METHOD_JNI_OFFSET_64 40
-DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_JNI_OFFSET_64), (static_cast<int32_t>(art::ArtMethod:: EntryPointFromJniOffset(8).Int32Value())))
+DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_JNI_OFFSET_64), (static_cast<int32_t>(art::ArtMethod:: EntryPointFromJniOffset(art::PointerSize::k64).Int32Value())))
 #define ART_METHOD_QUICK_CODE_OFFSET_32 32
-DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_QUICK_CODE_OFFSET_32), (static_cast<int32_t>(art::ArtMethod:: EntryPointFromQuickCompiledCodeOffset(4).Int32Value())))
+DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_QUICK_CODE_OFFSET_32), (static_cast<int32_t>(art::ArtMethod:: EntryPointFromQuickCompiledCodeOffset(art::PointerSize::k32).Int32Value())))
 #define ART_METHOD_QUICK_CODE_OFFSET_64 48
-DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_QUICK_CODE_OFFSET_64), (static_cast<int32_t>(art::ArtMethod:: EntryPointFromQuickCompiledCodeOffset(8).Int32Value())))
+DEFINE_CHECK_EQ(static_cast<int32_t>(ART_METHOD_QUICK_CODE_OFFSET_64), (static_cast<int32_t>(art::ArtMethod:: EntryPointFromQuickCompiledCodeOffset(art::PointerSize::k64).Int32Value())))
 #define LOCK_WORD_STATE_SHIFT 30
 DEFINE_CHECK_EQ(static_cast<int32_t>(LOCK_WORD_STATE_SHIFT), (static_cast<int32_t>(art::LockWord::kStateShift)))
 #define LOCK_WORD_STATE_MASK 0xc0000000
diff --git a/runtime/handle_scope-inl.h b/runtime/handle_scope-inl.h
index ca206ef..2e1b8ed 100644
--- a/runtime/handle_scope-inl.h
+++ b/runtime/handle_scope-inl.h
@@ -57,9 +57,9 @@
   return header_size + data_size;
 }
 
-inline size_t HandleScope::SizeOf(size_t pointer_size, uint32_t num_references) {
+inline size_t HandleScope::SizeOf(PointerSize pointer_size, uint32_t num_references) {
   // Assume that the layout is packed.
-  size_t header_size = pointer_size + sizeof(number_of_references_);
+  size_t header_size = ReferencesOffset(pointer_size);
   size_t data_size = sizeof(StackReference<mirror::Object>) * num_references;
   return header_size + data_size;
 }
diff --git a/runtime/handle_scope.h b/runtime/handle_scope.h
index d53a0e4..67d7054 100644
--- a/runtime/handle_scope.h
+++ b/runtime/handle_scope.h
@@ -19,6 +19,7 @@
 
 #include <stack>
 
+#include "base/enums.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "handle.h"
@@ -52,7 +53,7 @@
   static size_t SizeOf(uint32_t num_references);
 
   // Returns the size of a HandleScope containing num_references handles.
-  static size_t SizeOf(size_t pointer_size, uint32_t num_references);
+  static size_t SizeOf(PointerSize pointer_size, uint32_t num_references);
 
   // Link to previous HandleScope or null.
   HandleScope* GetLink() const {
@@ -73,18 +74,18 @@
   ALWAYS_INLINE bool Contains(StackReference<mirror::Object>* handle_scope_entry) const;
 
   // Offset of link within HandleScope, used by generated code.
-  static size_t LinkOffset(size_t pointer_size ATTRIBUTE_UNUSED) {
+  static constexpr size_t LinkOffset(PointerSize pointer_size ATTRIBUTE_UNUSED) {
     return 0;
   }
 
   // Offset of length within handle scope, used by generated code.
-  static size_t NumberOfReferencesOffset(size_t pointer_size) {
-    return pointer_size;
+  static constexpr size_t NumberOfReferencesOffset(PointerSize pointer_size) {
+    return static_cast<size_t>(pointer_size);
   }
 
   // Offset of link within handle scope, used by generated code.
-  static size_t ReferencesOffset(size_t pointer_size) {
-    return pointer_size + sizeof(number_of_references_);
+  static constexpr size_t ReferencesOffset(PointerSize pointer_size) {
+    return NumberOfReferencesOffset(pointer_size) + sizeof(number_of_references_);
   }
 
   // Placement new creation.
@@ -96,7 +97,7 @@
  protected:
   // Return backing storage used for references.
   ALWAYS_INLINE StackReference<mirror::Object>* GetReferences() const {
-    uintptr_t address = reinterpret_cast<uintptr_t>(this) + ReferencesOffset(sizeof(void*));
+    uintptr_t address = reinterpret_cast<uintptr_t>(this) + ReferencesOffset(kRuntimePointerSize);
     return reinterpret_cast<StackReference<mirror::Object>*>(address);
   }
 
diff --git a/runtime/handle_scope_test.cc b/runtime/handle_scope_test.cc
index dc99987..58f3800 100644
--- a/runtime/handle_scope_test.cc
+++ b/runtime/handle_scope_test.cc
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include "base/enums.h"
 #include "gtest/gtest.h"
 #include "handle_scope-inl.h"
 #include "scoped_thread_state_change.h"
@@ -48,13 +49,13 @@
 
   {
     uintptr_t* link_ptr = reinterpret_cast<uintptr_t*>(table_base_ptr +
-        HandleScope::LinkOffset(sizeof(void*)));
+        HandleScope::LinkOffset(kRuntimePointerSize));
     EXPECT_EQ(*link_ptr, static_cast<size_t>(0x5678));
   }
 
   {
     uint32_t* num_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
-        HandleScope::NumberOfReferencesOffset(sizeof(void*)));
+        HandleScope::NumberOfReferencesOffset(kRuntimePointerSize));
     EXPECT_EQ(*num_ptr, static_cast<size_t>(0x9ABC));
   }
 
@@ -64,7 +65,7 @@
     EXPECT_EQ(sizeof(StackReference<mirror::Object>), sizeof(uint32_t));
 
     uint32_t* ref_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
-        HandleScope::ReferencesOffset(sizeof(void*)));
+        HandleScope::ReferencesOffset(kRuntimePointerSize));
     EXPECT_EQ(*ref_ptr, static_cast<uint32_t>(0x1234));
   }
 }
diff --git a/runtime/image-inl.h b/runtime/image-inl.h
index cd0557a..28620db 100644
--- a/runtime/image-inl.h
+++ b/runtime/image-inl.h
@@ -48,7 +48,7 @@
 template <typename Visitor>
 inline void ImageHeader::VisitPackedImTables(const Visitor& visitor,
                                              uint8_t* base,
-                                             size_t pointer_size) const {
+                                             PointerSize pointer_size) const {
   const ImageSection& section = GetImageSection(kSectionImTables);
   for (size_t pos = 0; pos < section.Size();) {
     ImTable* imt = reinterpret_cast<ImTable*>(base + section.Offset() + pos);
@@ -66,7 +66,7 @@
 template <typename Visitor>
 inline void ImageHeader::VisitPackedImtConflictTables(const Visitor& visitor,
                                                       uint8_t* base,
-                                                      size_t pointer_size) const {
+                                                      PointerSize pointer_size) const {
   const ImageSection& section = GetImageSection(kSectionIMTConflictTables);
   for (size_t pos = 0; pos < section.Size(); ) {
     auto* table = reinterpret_cast<ImtConflictTable*>(base + section.Offset() + pos);
diff --git a/runtime/image.cc b/runtime/image.cc
index 2362a92..6888183 100644
--- a/runtime/image.cc
+++ b/runtime/image.cc
@@ -160,7 +160,7 @@
 
 void ImageHeader::VisitPackedArtMethods(ArtMethodVisitor* visitor,
                                         uint8_t* base,
-                                        size_t pointer_size) const {
+                                        PointerSize pointer_size) const {
   const size_t method_alignment = ArtMethod::Alignment(pointer_size);
   const size_t method_size = ArtMethod::Size(pointer_size);
   const ImageSection& methods = GetMethodsSection();
diff --git a/runtime/image.h b/runtime/image.h
index 06f06ee..a98cea1 100644
--- a/runtime/image.h
+++ b/runtime/image.h
@@ -19,6 +19,7 @@
 
 #include <string.h>
 
+#include "base/enums.h"
 #include "globals.h"
 #include "mirror/object.h"
 
@@ -156,7 +157,11 @@
     return reinterpret_cast<uint8_t*>(oat_file_end_);
   }
 
-  uint32_t GetPointerSize() const {
+  PointerSize GetPointerSize() const {
+    return ConvertToPointerSize(pointer_size_);
+  }
+
+  uint32_t GetPointerSizeUnchecked() const {
     return pointer_size_;
   }
 
@@ -273,7 +278,9 @@
 
   // Visit ArtMethods in the section starting at base. Includes runtime methods.
   // TODO: Delete base parameter if it is always equal to GetImageBegin.
-  void VisitPackedArtMethods(ArtMethodVisitor* visitor, uint8_t* base, size_t pointer_size) const;
+  void VisitPackedArtMethods(ArtMethodVisitor* visitor,
+                             uint8_t* base,
+                             PointerSize pointer_size) const;
 
   // Visit ArtMethods in the section starting at base.
   // TODO: Delete base parameter if it is always equal to GetImageBegin.
@@ -282,12 +289,12 @@
   template <typename Visitor>
   void VisitPackedImTables(const Visitor& visitor,
                            uint8_t* base,
-                           size_t pointer_size) const;
+                           PointerSize pointer_size) const;
 
   template <typename Visitor>
   void VisitPackedImtConflictTables(const Visitor& visitor,
                                     uint8_t* base,
-                                    size_t pointer_size) const;
+                                    PointerSize pointer_size) const;
 
  private:
   static const uint8_t kImageMagic[4];
diff --git a/runtime/imtable.h b/runtime/imtable.h
index 51faf70..2416621 100644
--- a/runtime/imtable.h
+++ b/runtime/imtable.h
@@ -32,10 +32,10 @@
   // (non-marker) interfaces.
   static constexpr size_t kSize = IMT_SIZE;
 
-  ArtMethod* Get(size_t index, size_t pointer_size) {
+  ArtMethod* Get(size_t index, PointerSize pointer_size) {
     DCHECK_LT(index, kSize);
     uint8_t* ptr = reinterpret_cast<uint8_t*>(this) + OffsetOfElement(index, pointer_size);
-    if (pointer_size == 4) {
+    if (pointer_size == PointerSize::k32) {
       uint32_t value = *reinterpret_cast<uint32_t*>(ptr);
       return reinterpret_cast<ArtMethod*>(value);
     } else {
@@ -44,10 +44,10 @@
     }
   }
 
-  void Set(size_t index, ArtMethod* method, size_t pointer_size) {
+  void Set(size_t index, ArtMethod* method, PointerSize pointer_size) {
     DCHECK_LT(index, kSize);
     uint8_t* ptr = reinterpret_cast<uint8_t*>(this) + OffsetOfElement(index, pointer_size);
-    if (pointer_size == 4) {
+    if (pointer_size == PointerSize::k32) {
       uintptr_t value = reinterpret_cast<uintptr_t>(method);
       DCHECK_EQ(static_cast<uint32_t>(value), value);  // Check that we dont lose any non 0 bits.
       *reinterpret_cast<uint32_t*>(ptr) = static_cast<uint32_t>(value);
@@ -56,18 +56,18 @@
     }
   }
 
-  static size_t OffsetOfElement(size_t index, size_t pointer_size) {
-    return index * pointer_size;
+  static size_t OffsetOfElement(size_t index, PointerSize pointer_size) {
+    return index * static_cast<size_t>(pointer_size);
   }
 
-  void Populate(ArtMethod** data, size_t pointer_size) {
+  void Populate(ArtMethod** data, PointerSize pointer_size) {
     for (size_t i = 0; i < kSize; ++i) {
       Set(i, data[i], pointer_size);
     }
   }
 
-  constexpr static size_t SizeInBytes(size_t pointer_size) {
-    return kSize * pointer_size;
+  constexpr static size_t SizeInBytes(PointerSize pointer_size) {
+    return kSize * static_cast<size_t>(pointer_size);
   }
 };
 
diff --git a/runtime/instrumentation.cc b/runtime/instrumentation.cc
index 7dfc83f..61ffe44 100644
--- a/runtime/instrumentation.cc
+++ b/runtime/instrumentation.cc
@@ -94,7 +94,7 @@
     // We need the class to be resolved to install/uninstall stubs. Otherwise its methods
     // could not be initialized or linked with regards to class inheritance.
   } else {
-    for (ArtMethod& method : klass->GetMethods(sizeof(void*))) {
+    for (ArtMethod& method : klass->GetMethods(kRuntimePointerSize)) {
       InstallStubsForMethod(&method);
     }
   }
@@ -886,7 +886,7 @@
   ConfigureStubs(key, InstrumentationLevel::kInstrumentNothing);
 }
 
-const void* Instrumentation::GetQuickCodeFor(ArtMethod* method, size_t pointer_size) const {
+const void* Instrumentation::GetQuickCodeFor(ArtMethod* method, PointerSize pointer_size) const {
   Runtime* runtime = Runtime::Current();
   if (LIKELY(!instrumentation_stubs_installed_)) {
     const void* code = method->GetEntryPointFromQuickCompiledCodePtrSize(pointer_size);
@@ -1063,7 +1063,7 @@
 
   ArtMethod* method = instrumentation_frame.method_;
   uint32_t length;
-  const size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+  const PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
   char return_shorty = method->GetInterfaceMethodIfProxy(pointer_size)->GetShorty(&length)[0];
   JValue return_value;
   if (return_shorty == 'V') {
diff --git a/runtime/instrumentation.h b/runtime/instrumentation.h
index 49dd060..757be8e 100644
--- a/runtime/instrumentation.h
+++ b/runtime/instrumentation.h
@@ -22,6 +22,7 @@
 #include <unordered_set>
 
 #include "arch/instruction_set.h"
+#include "base/enums.h"
 #include "base/macros.h"
 #include "base/mutex.h"
 #include "gc_root.h"
@@ -234,7 +235,7 @@
   // Get the quick code for the given method. More efficient than asking the class linker as it
   // will short-cut to GetCode if instrumentation and static method resolution stubs aren't
   // installed.
-  const void* GetQuickCodeFor(ArtMethod* method, size_t pointer_size) const
+  const void* GetQuickCodeFor(ArtMethod* method, PointerSize pointer_size) const
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   void ForceInterpretOnly() {
diff --git a/runtime/instrumentation_test.cc b/runtime/instrumentation_test.cc
index 56e3bc5..684c471 100644
--- a/runtime/instrumentation_test.cc
+++ b/runtime/instrumentation_test.cc
@@ -16,6 +16,7 @@
 
 #include "instrumentation.h"
 
+#include "base/enums.h"
 #include "common_runtime_test.h"
 #include "common_throws.h"
 #include "class_linker-inl.h"
@@ -461,7 +462,7 @@
   mirror::Class* klass = class_linker->FindClass(soa.Self(), "LInstrumentation;", loader);
   ASSERT_TRUE(klass != nullptr);
   ArtMethod* method_to_deoptimize = klass->FindDeclaredDirectMethod("instanceMethod", "()V",
-                                                                    sizeof(void*));
+                                                                    kRuntimePointerSize);
   ASSERT_TRUE(method_to_deoptimize != nullptr);
 
   EXPECT_FALSE(instr->AreAllMethodsDeoptimized());
@@ -508,7 +509,7 @@
   mirror::Class* klass = class_linker->FindClass(soa.Self(), "LInstrumentation;", loader);
   ASSERT_TRUE(klass != nullptr);
   ArtMethod* method_to_deoptimize = klass->FindDeclaredDirectMethod("instanceMethod", "()V",
-                                                                    sizeof(void*));
+                                                                    kRuntimePointerSize);
   ASSERT_TRUE(method_to_deoptimize != nullptr);
 
   EXPECT_FALSE(instr->AreAllMethodsDeoptimized());
diff --git a/runtime/interpreter/interpreter_common.cc b/runtime/interpreter/interpreter_common.cc
index 53d5e43..11b7ef4 100644
--- a/runtime/interpreter/interpreter_common.cc
+++ b/runtime/interpreter/interpreter_common.cc
@@ -18,6 +18,7 @@
 
 #include <cmath>
 
+#include "base/enums.h"
 #include "debugger.h"
 #include "entrypoints/runtime_asm_entrypoints.h"
 #include "jit/jit.h"
@@ -537,7 +538,7 @@
   }
   method->Invoke(self, shadow_frame->GetVRegArgs(arg_offset),
                  (shadow_frame->NumberOfVRegs() - arg_offset) * sizeof(uint32_t),
-                 result, method->GetInterfaceMethodIfProxy(sizeof(void*))->GetShorty());
+                 result, method->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty());
 }
 
 void SetStringInitValueToAllAliases(ShadowFrame* shadow_frame,
@@ -656,7 +657,8 @@
     // As a special case for proxy methods, which are not dex-backed,
     // we have to retrieve type information from the proxy's method
     // interface method instead (which is dex backed since proxies are never interfaces).
-    ArtMethod* method = new_shadow_frame->GetMethod()->GetInterfaceMethodIfProxy(sizeof(void*));
+    ArtMethod* method =
+        new_shadow_frame->GetMethod()->GetInterfaceMethodIfProxy(kRuntimePointerSize);
 
     // We need to do runtime check on reference assignment. We need to load the shorty
     // to get the exact type of each reference argument.
@@ -686,7 +688,7 @@
         case 'L': {
           Object* o = shadow_frame.GetVRegReference(src_reg);
           if (do_assignability_check && o != nullptr) {
-            size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+            PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
             Class* arg_type =
                 method->GetClassFromTypeIndex(
                     params->GetTypeItem(shorty_pos).type_idx_, true /* resolve */, pointer_size);
diff --git a/runtime/interpreter/interpreter_common.h b/runtime/interpreter/interpreter_common.h
index 7dfa6e2..174d4e0 100644
--- a/runtime/interpreter/interpreter_common.h
+++ b/runtime/interpreter/interpreter_common.h
@@ -26,6 +26,7 @@
 
 #include "art_field-inl.h"
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "class_linker-inl.h"
@@ -681,7 +682,7 @@
   const uint32_t vtable_idx = (is_range) ? inst->VRegB_3rc() : inst->VRegB_35c();
   CHECK(receiver->GetClass()->ShouldHaveEmbeddedVTable());
   ArtMethod* const called_method = receiver->GetClass()->GetEmbeddedVTableEntry(
-      vtable_idx, sizeof(void*));
+      vtable_idx, kRuntimePointerSize);
   if (UNLIKELY(called_method == nullptr)) {
     CHECK(self->IsExceptionPending());
     result->SetJ(0);
diff --git a/runtime/interpreter/interpreter_switch_impl.cc b/runtime/interpreter/interpreter_switch_impl.cc
index 18330ba..8bfc10c 100644
--- a/runtime/interpreter/interpreter_switch_impl.cc
+++ b/runtime/interpreter/interpreter_switch_impl.cc
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include "base/enums.h"
 #include "base/stl_util.h"  // MakeUnique
 #include "experimental_flags.h"
 #include "interpreter_common.h"
@@ -283,7 +284,7 @@
         const size_t ref_idx = inst->VRegA_11x(inst_data);
         Object* obj_result = shadow_frame.GetVRegReference(ref_idx);
         if (do_assignability_check && obj_result != nullptr) {
-          size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+          PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
           Class* return_type = shadow_frame.GetMethod()->GetReturnType(true /* resolve */,
                                                                        pointer_size);
           // Re-load since it might have moved.
diff --git a/runtime/interpreter/unstarted_runtime.cc b/runtime/interpreter/unstarted_runtime.cc
index 793260d..57443f1 100644
--- a/runtime/interpreter/unstarted_runtime.cc
+++ b/runtime/interpreter/unstarted_runtime.cc
@@ -29,6 +29,7 @@
 
 #include "art_method-inl.h"
 #include "base/casts.h"
+#include "base/enums.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "class_linker.h"
@@ -301,21 +302,23 @@
     return;
   }
   Runtime* runtime = Runtime::Current();
-  size_t pointer_size = runtime->GetClassLinker()->GetImagePointerSize();
+  PointerSize pointer_size = runtime->GetClassLinker()->GetImagePointerSize();
   mirror::Field* field;
   if (runtime->IsActiveTransaction()) {
-    if (pointer_size == 8) {
-      field = mirror::Field::CreateFromArtField<8U, true>(self, found, true);
+    if (pointer_size == PointerSize::k64) {
+      field = mirror::Field::CreateFromArtField<PointerSize::k64, true>(
+          self, found, true);
     } else {
-      DCHECK_EQ(pointer_size, 4U);
-      field = mirror::Field::CreateFromArtField<4U, true>(self, found, true);
+      field = mirror::Field::CreateFromArtField<PointerSize::k32, true>(
+          self, found, true);
     }
   } else {
-    if (pointer_size == 8) {
-      field = mirror::Field::CreateFromArtField<8U, false>(self, found, true);
+    if (pointer_size == PointerSize::k64) {
+      field = mirror::Field::CreateFromArtField<PointerSize::k64, false>(
+          self, found, true);
     } else {
-      DCHECK_EQ(pointer_size, 4U);
-      field = mirror::Field::CreateFromArtField<4U, false>(self, found, true);
+      field = mirror::Field::CreateFromArtField<PointerSize::k32, false>(
+          self, found, true);
     }
   }
   result->SetL(field);
@@ -335,21 +338,23 @@
       shadow_frame->GetVRegReference(arg_offset + 2)->AsObjectArray<mirror::Class>();
   Runtime* runtime = Runtime::Current();
   bool transaction = runtime->IsActiveTransaction();
-  size_t pointer_size = runtime->GetClassLinker()->GetImagePointerSize();
+  PointerSize pointer_size = runtime->GetClassLinker()->GetImagePointerSize();
   mirror::Method* method;
   if (transaction) {
-    if (pointer_size == 8U) {
-      method = mirror::Class::GetDeclaredMethodInternal<8U, true>(self, klass, name, args);
+    if (pointer_size == PointerSize::k64) {
+      method = mirror::Class::GetDeclaredMethodInternal<PointerSize::k64, true>(
+          self, klass, name, args);
     } else {
-      DCHECK_EQ(pointer_size, 4U);
-      method = mirror::Class::GetDeclaredMethodInternal<4U, true>(self, klass, name, args);
+      method = mirror::Class::GetDeclaredMethodInternal<PointerSize::k32, true>(
+          self, klass, name, args);
     }
   } else {
-    if (pointer_size == 8U) {
-      method = mirror::Class::GetDeclaredMethodInternal<8U, false>(self, klass, name, args);
+    if (pointer_size == PointerSize::k64) {
+      method = mirror::Class::GetDeclaredMethodInternal<PointerSize::k64, false>(
+          self, klass, name, args);
     } else {
-      DCHECK_EQ(pointer_size, 4U);
-      method = mirror::Class::GetDeclaredMethodInternal<4U, false>(self, klass, name, args);
+      method = mirror::Class::GetDeclaredMethodInternal<PointerSize::k32, false>(
+          self, klass, name, args);
     }
   }
   result->SetL(method);
@@ -367,21 +372,23 @@
       shadow_frame->GetVRegReference(arg_offset + 1)->AsObjectArray<mirror::Class>();
   Runtime* runtime = Runtime::Current();
   bool transaction = runtime->IsActiveTransaction();
-  size_t pointer_size = runtime->GetClassLinker()->GetImagePointerSize();
+  PointerSize pointer_size = runtime->GetClassLinker()->GetImagePointerSize();
   mirror::Constructor* constructor;
   if (transaction) {
-    if (pointer_size == 8U) {
-      constructor = mirror::Class::GetDeclaredConstructorInternal<8U, true>(self, klass, args);
+    if (pointer_size == PointerSize::k64) {
+      constructor = mirror::Class::GetDeclaredConstructorInternal<PointerSize::k64,
+                                                                  true>(self, klass, args);
     } else {
-      DCHECK_EQ(pointer_size, 4U);
-      constructor = mirror::Class::GetDeclaredConstructorInternal<4U, true>(self, klass, args);
+      constructor = mirror::Class::GetDeclaredConstructorInternal<PointerSize::k32,
+                                                                  true>(self, klass, args);
     }
   } else {
-    if (pointer_size == 8U) {
-      constructor = mirror::Class::GetDeclaredConstructorInternal<8U, false>(self, klass, args);
+    if (pointer_size == PointerSize::k64) {
+      constructor = mirror::Class::GetDeclaredConstructorInternal<PointerSize::k64,
+                                                                  false>(self, klass, args);
     } else {
-      DCHECK_EQ(pointer_size, 4U);
-      constructor = mirror::Class::GetDeclaredConstructorInternal<4U, false>(self, klass, args);
+      constructor = mirror::Class::GetDeclaredConstructorInternal<PointerSize::k32,
+                                                                  false>(self, klass, args);
     }
   }
   result->SetL(constructor);
diff --git a/runtime/interpreter/unstarted_runtime_test.cc b/runtime/interpreter/unstarted_runtime_test.cc
index 814b001..7e1f795 100644
--- a/runtime/interpreter/unstarted_runtime_test.cc
+++ b/runtime/interpreter/unstarted_runtime_test.cc
@@ -20,6 +20,7 @@
 #include <locale>
 
 #include "base/casts.h"
+#include "base/enums.h"
 #include "base/memory_tool.h"
 #include "class_linker.h"
 #include "common_runtime_test.h"
@@ -383,7 +384,7 @@
   ScopedObjectAccess soa(self);
   mirror::Class* klass = mirror::String::GetJavaLangString();
   ArtMethod* method = klass->FindDeclaredDirectMethod("<init>", "(Ljava/lang/String;)V",
-                                                      sizeof(void*));
+                                                      kRuntimePointerSize);
 
   // create instruction data for invoke-direct {v0, v1} of method with fake index
   uint16_t inst_data[3] = { 0x2070, 0x0000, 0x0010 };
diff --git a/runtime/jit/jit.cc b/runtime/jit/jit.cc
index cfe6cd1..d52030f 100644
--- a/runtime/jit/jit.cc
+++ b/runtime/jit/jit.cc
@@ -19,6 +19,7 @@
 #include <dlfcn.h>
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "debugger.h"
 #include "entrypoints/runtime_asm_entrypoints.h"
 #include "interpreter/interpreter.h"
@@ -258,7 +259,7 @@
 
   // If we get a request to compile a proxy method, we pass the actual Java method
   // of that proxy method, as the compiler does not expect a proxy method.
-  ArtMethod* method_to_compile = method->GetInterfaceMethodIfProxy(sizeof(void*));
+  ArtMethod* method_to_compile = method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
   if (!code_cache_->NotifyCompilationOf(method_to_compile, self, osr)) {
     return false;
   }
@@ -410,7 +411,7 @@
 
   // Get the actual Java method if this method is from a proxy class. The compiler
   // and the JIT code cache do not expect methods from proxy classes.
-  method = method->GetInterfaceMethodIfProxy(sizeof(void*));
+  method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
 
   // Cheap check if the method has been compiled already. That's an indicator that we should
   // osr into it.
@@ -616,7 +617,7 @@
   int32_t new_count = starting_count + count;   // int32 here to avoid wrap-around;
   if (starting_count < warm_method_threshold_) {
     if ((new_count >= warm_method_threshold_) &&
-        (method->GetProfilingInfo(sizeof(void*)) == nullptr)) {
+        (method->GetProfilingInfo(kRuntimePointerSize) == nullptr)) {
       bool success = ProfilingInfo::Create(self, method, /* retry_allocation */ false);
       if (success) {
         VLOG(jit) << "Start profiling " << PrettyMethod(method);
@@ -671,7 +672,7 @@
     return;
   }
 
-  ProfilingInfo* profiling_info = method->GetProfilingInfo(sizeof(void*));
+  ProfilingInfo* profiling_info = method->GetProfilingInfo(kRuntimePointerSize);
   // Update the entrypoint if the ProfilingInfo has one. The interpreter will call it
   // instead of interpreting the method.
   if ((profiling_info != nullptr) && (profiling_info->GetSavedEntryPoint() != nullptr)) {
@@ -689,7 +690,7 @@
                                    ArtMethod* callee ATTRIBUTE_UNUSED) {
   ScopedAssertNoThreadSuspension ants(thread, __FUNCTION__);
   DCHECK(this_object != nullptr);
-  ProfilingInfo* info = caller->GetProfilingInfo(sizeof(void*));
+  ProfilingInfo* info = caller->GetProfilingInfo(kRuntimePointerSize);
   if (info != nullptr) {
     // Since the instrumentation is marked from the declaring class we need to mark the card so
     // that mod-union tables and card rescanning know about the update.
diff --git a/runtime/jit/jit_code_cache.cc b/runtime/jit/jit_code_cache.cc
index 6b6f5a5..c2097f8 100644
--- a/runtime/jit/jit_code_cache.cc
+++ b/runtime/jit/jit_code_cache.cc
@@ -19,6 +19,7 @@
 #include <sstream>
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/stl_util.h"
 #include "base/systrace.h"
 #include "base/time_utils.h"
@@ -738,13 +739,14 @@
         // a method has compiled code but no ProfilingInfo.
         // We make sure compiled methods have a ProfilingInfo object. It is needed for
         // code cache collection.
-        if (ContainsPc(ptr) && info->GetMethod()->GetProfilingInfo(sizeof(void*)) == nullptr) {
+        if (ContainsPc(ptr) &&
+            info->GetMethod()->GetProfilingInfo(kRuntimePointerSize) == nullptr) {
           // We clear the inline caches as classes in it might be stalled.
           info->ClearGcRootsInInlineCaches();
           // Do a fence to make sure the clearing is seen before attaching to the method.
           QuasiAtomic::ThreadFenceRelease();
           info->GetMethod()->SetProfilingInfo(info);
-        } else if (info->GetMethod()->GetProfilingInfo(sizeof(void*)) != info) {
+        } else if (info->GetMethod()->GetProfilingInfo(kRuntimePointerSize) != info) {
           // No need for this ProfilingInfo object anymore.
           FreeData(reinterpret_cast<uint8_t*>(info));
           return true;
@@ -762,7 +764,7 @@
   // have memory leaks of compiled code otherwise.
   for (const auto& it : method_code_map_) {
     ArtMethod* method = it.second;
-    if (method->GetProfilingInfo(sizeof(void*)) == nullptr) {
+    if (method->GetProfilingInfo(kRuntimePointerSize) == nullptr) {
       const void* code_ptr = it.first;
       const OatQuickMethodHeader* method_header = OatQuickMethodHeader::FromCodePointer(code_ptr);
       if (method_header->GetEntryPoint() == method->GetEntryPointFromQuickCompiledCode()) {
@@ -851,7 +853,7 @@
       sizeof(void*));
 
   // Check whether some other thread has concurrently created it.
-  ProfilingInfo* info = method->GetProfilingInfo(sizeof(void*));
+  ProfilingInfo* info = method->GetProfilingInfo(kRuntimePointerSize);
   if (info != nullptr) {
     return info;
   }
@@ -919,7 +921,7 @@
     return false;
   }
 
-  ProfilingInfo* info = method->GetProfilingInfo(sizeof(void*));
+  ProfilingInfo* info = method->GetProfilingInfo(kRuntimePointerSize);
   if (info == nullptr) {
     VLOG(jit) << PrettyMethod(method) << " needs a ProfilingInfo to be compiled";
     // Because the counter is not atomic, there are some rare cases where we may not
@@ -939,7 +941,7 @@
 
 ProfilingInfo* JitCodeCache::NotifyCompilerUse(ArtMethod* method, Thread* self) {
   MutexLock mu(self, lock_);
-  ProfilingInfo* info = method->GetProfilingInfo(sizeof(void*));
+  ProfilingInfo* info = method->GetProfilingInfo(kRuntimePointerSize);
   if (info != nullptr) {
     info->IncrementInlineUse();
   }
@@ -948,13 +950,13 @@
 
 void JitCodeCache::DoneCompilerUse(ArtMethod* method, Thread* self) {
   MutexLock mu(self, lock_);
-  ProfilingInfo* info = method->GetProfilingInfo(sizeof(void*));
+  ProfilingInfo* info = method->GetProfilingInfo(kRuntimePointerSize);
   DCHECK(info != nullptr);
   info->DecrementInlineUse();
 }
 
 void JitCodeCache::DoneCompiling(ArtMethod* method, Thread* self ATTRIBUTE_UNUSED, bool osr) {
-  ProfilingInfo* info = method->GetProfilingInfo(sizeof(void*));
+  ProfilingInfo* info = method->GetProfilingInfo(kRuntimePointerSize);
   DCHECK(info->IsMethodBeingCompiled(osr));
   info->SetIsMethodBeingCompiled(false, osr);
 }
@@ -966,7 +968,7 @@
 
 void JitCodeCache::InvalidateCompiledCodeFor(ArtMethod* method,
                                              const OatQuickMethodHeader* header) {
-  ProfilingInfo* profiling_info = method->GetProfilingInfo(sizeof(void*));
+  ProfilingInfo* profiling_info = method->GetProfilingInfo(kRuntimePointerSize);
   if ((profiling_info != nullptr) &&
       (profiling_info->GetSavedEntryPoint() == header->GetEntryPoint())) {
     // Prevent future uses of the compiled code.
diff --git a/runtime/jit/profile_saver.cc b/runtime/jit/profile_saver.cc
index 4d4d1ea..5a469e5 100644
--- a/runtime/jit/profile_saver.cc
+++ b/runtime/jit/profile_saver.cc
@@ -21,6 +21,7 @@
 #include <fcntl.h>
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/systrace.h"
 #include "base/time_utils.h"
 #include "compiler_filter.h"
@@ -206,12 +207,13 @@
     if (Runtime::Current()->GetHeap()->ObjectIsInBootImageSpace(klass)) {
       return true;
     }
-    for (ArtMethod& method : klass->GetMethods(sizeof(void*))) {
+    for (ArtMethod& method : klass->GetMethods(kRuntimePointerSize)) {
       if (!method.IsNative()) {
         if (method.GetCounter() >= startup_method_samples_ ||
-            method.GetProfilingInfo(sizeof(void*)) != nullptr) {
+            method.GetProfilingInfo(kRuntimePointerSize) != nullptr) {
           // Have samples, add to profile.
-          const DexFile* dex_file = method.GetInterfaceMethodIfProxy(sizeof(void*))->GetDexFile();
+          const DexFile* dex_file =
+              method.GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetDexFile();
           methods_->push_back(MethodReference(dex_file, method.GetDexMethodIndex()));
         }
       }
diff --git a/runtime/jni_internal.cc b/runtime/jni_internal.cc
index 6ef3999..e1a4e2a 100644
--- a/runtime/jni_internal.cc
+++ b/runtime/jni_internal.cc
@@ -27,6 +27,7 @@
 #include "art_method-inl.h"
 #include "atomic.h"
 #include "base/allocator.h"
+#include "base/enums.h"
 #include "base/logging.h"
 #include "base/mutex.h"
 #include "base/stl_util.h"
@@ -375,12 +376,12 @@
     ScopedObjectAccess soa(env);
     ArtMethod* m = soa.DecodeMethod(mid);
     mirror::AbstractMethod* method;
-    DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), sizeof(void*));
+    DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
     DCHECK(!Runtime::Current()->IsActiveTransaction());
     if (m->IsConstructor()) {
-      method = mirror::Constructor::CreateFromArtMethod<sizeof(void*), false>(soa.Self(), m);
+      method = mirror::Constructor::CreateFromArtMethod<kRuntimePointerSize, false>(soa.Self(), m);
     } else {
-      method = mirror::Method::CreateFromArtMethod<sizeof(void*), false>(soa.Self(), m);
+      method = mirror::Method::CreateFromArtMethod<kRuntimePointerSize, false>(soa.Self(), m);
     }
     return soa.AddLocalReference<jobject>(method);
   }
@@ -390,7 +391,7 @@
     ScopedObjectAccess soa(env);
     ArtField* f = soa.DecodeField(fid);
     return soa.AddLocalReference<jobject>(
-        mirror::Field::CreateFromArtField<sizeof(void*)>(soa.Self(), f, true));
+        mirror::Field::CreateFromArtField<kRuntimePointerSize>(soa.Self(), f, true));
   }
 
   static jclass GetObjectClass(JNIEnv* env, jobject java_object) {
diff --git a/runtime/memory_region.h b/runtime/memory_region.h
index fbb0441..f018c1f 100644
--- a/runtime/memory_region.h
+++ b/runtime/memory_region.h
@@ -178,9 +178,9 @@
   }
 
   // Is `address` aligned on a machine word?
-  template<typename T> static bool IsWordAligned(const T* address) {
+  template<typename T> static constexpr bool IsWordAligned(const T* address) {
     // Word alignment in bytes.
-    size_t kWordAlignment = GetInstructionSetPointerSize(kRuntimeISA);
+    size_t kWordAlignment = static_cast<size_t>(GetInstructionSetPointerSize(kRuntimeISA));
     return IsAlignedParam(address, kWordAlignment);
   }
 
diff --git a/runtime/mirror/abstract_method.cc b/runtime/mirror/abstract_method.cc
index ef39132..b4dce58 100644
--- a/runtime/mirror/abstract_method.cc
+++ b/runtime/mirror/abstract_method.cc
@@ -21,7 +21,7 @@
 namespace art {
 namespace mirror {
 
-template <size_t kPointerSize, bool kTransactionActive>
+template <PointerSize kPointerSize, bool kTransactionActive>
 bool AbstractMethod::CreateFromArtMethod(ArtMethod* method) {
   auto* interface_method = method->GetInterfaceMethodIfProxy(kPointerSize);
   SetArtMethod<kTransactionActive>(method);
@@ -33,10 +33,14 @@
   return true;
 }
 
-template bool AbstractMethod::CreateFromArtMethod<4U, false>(ArtMethod* method);
-template bool AbstractMethod::CreateFromArtMethod<4U, true>(ArtMethod* method);
-template bool AbstractMethod::CreateFromArtMethod<8U, false>(ArtMethod* method);
-template bool AbstractMethod::CreateFromArtMethod<8U, true>(ArtMethod* method);
+template bool AbstractMethod::CreateFromArtMethod<PointerSize::k32, false>(
+    ArtMethod* method);
+template bool AbstractMethod::CreateFromArtMethod<PointerSize::k32, true>(
+    ArtMethod* method);
+template bool AbstractMethod::CreateFromArtMethod<PointerSize::k64, false>(
+    ArtMethod* method);
+template bool AbstractMethod::CreateFromArtMethod<PointerSize::k64, true>(
+    ArtMethod* method);
 
 ArtMethod* AbstractMethod::GetArtMethod() {
   return reinterpret_cast<ArtMethod*>(GetField64(ArtMethodOffset()));
diff --git a/runtime/mirror/abstract_method.h b/runtime/mirror/abstract_method.h
index 936b14c..cfbe492 100644
--- a/runtime/mirror/abstract_method.h
+++ b/runtime/mirror/abstract_method.h
@@ -34,7 +34,7 @@
 class MANAGED AbstractMethod : public AccessibleObject {
  public:
   // Called from Constructor::CreateFromArtMethod, Method::CreateFromArtMethod.
-  template <size_t kPointerSize, bool kTransactionActive>
+  template <PointerSize kPointerSize, bool kTransactionActive>
   bool CreateFromArtMethod(ArtMethod* method) SHARED_REQUIRES(Locks::mutator_lock_)
       REQUIRES(!Roles::uninterruptible_);
 
diff --git a/runtime/mirror/array-inl.h b/runtime/mirror/array-inl.h
index c6fa15d..014e54b 100644
--- a/runtime/mirror/array-inl.h
+++ b/runtime/mirror/array-inl.h
@@ -30,7 +30,7 @@
 namespace art {
 namespace mirror {
 
-inline uint32_t Array::ClassSize(size_t pointer_size) {
+inline uint32_t Array::ClassSize(PointerSize pointer_size) {
   uint32_t vtable_entries = Object::kVTableLength;
   return Class::ComputeClassSize(true, vtable_entries, 0, 0, 0, 0, 0, pointer_size);
 }
@@ -371,25 +371,23 @@
 }
 
 template<typename T, VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
-inline T PointerArray::GetElementPtrSize(uint32_t idx, size_t ptr_size) {
+inline T PointerArray::GetElementPtrSize(uint32_t idx, PointerSize ptr_size) {
   // C style casts here since we sometimes have T be a pointer, or sometimes an integer
   // (for stack traces).
-  if (ptr_size == 8) {
+  if (ptr_size == PointerSize::k64) {
     return (T)static_cast<uintptr_t>(
         AsLongArray<kVerifyFlags, kReadBarrierOption>()->GetWithoutChecks(idx));
   }
-  DCHECK_EQ(ptr_size, 4u);
   return (T)static_cast<uintptr_t>(
       AsIntArray<kVerifyFlags, kReadBarrierOption>()->GetWithoutChecks(idx));
 }
 
 template<bool kTransactionActive, bool kUnchecked>
-inline void PointerArray::SetElementPtrSize(uint32_t idx, uint64_t element, size_t ptr_size) {
-  if (ptr_size == 8) {
+inline void PointerArray::SetElementPtrSize(uint32_t idx, uint64_t element, PointerSize ptr_size) {
+  if (ptr_size == PointerSize::k64) {
     (kUnchecked ? down_cast<LongArray*>(static_cast<Object*>(this)) : AsLongArray())->
         SetWithoutChecks<kTransactionActive>(idx, element);
   } else {
-    DCHECK_EQ(ptr_size, 4u);
     DCHECK_LE(element, static_cast<uint64_t>(0xFFFFFFFFu));
     (kUnchecked ? down_cast<IntArray*>(static_cast<Object*>(this)) : AsIntArray())
         ->SetWithoutChecks<kTransactionActive>(idx, static_cast<uint32_t>(element));
@@ -397,7 +395,7 @@
 }
 
 template<bool kTransactionActive, bool kUnchecked, typename T>
-inline void PointerArray::SetElementPtrSize(uint32_t idx, T* element, size_t ptr_size) {
+inline void PointerArray::SetElementPtrSize(uint32_t idx, T* element, PointerSize ptr_size) {
   SetElementPtrSize<kTransactionActive, kUnchecked>(idx,
                                                     reinterpret_cast<uintptr_t>(element),
                                                     ptr_size);
@@ -405,7 +403,7 @@
 
 template <VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption, typename Visitor>
 inline void PointerArray::Fixup(mirror::PointerArray* dest,
-                                size_t pointer_size,
+                                PointerSize pointer_size,
                                 const Visitor& visitor) {
   for (size_t i = 0, count = GetLength(); i < count; ++i) {
     void* ptr = GetElementPtrSize<void*, kVerifyFlags, kReadBarrierOption>(i, pointer_size);
diff --git a/runtime/mirror/array.h b/runtime/mirror/array.h
index 9a21ec2..c9e0cb3 100644
--- a/runtime/mirror/array.h
+++ b/runtime/mirror/array.h
@@ -17,6 +17,7 @@
 #ifndef ART_RUNTIME_MIRROR_ARRAY_H_
 #define ART_RUNTIME_MIRROR_ARRAY_H_
 
+#include "base/enums.h"
 #include "gc_root.h"
 #include "gc/allocator_type.h"
 #include "object.h"
@@ -31,7 +32,7 @@
 class MANAGED Array : public Object {
  public:
   // The size of a java.lang.Class representing an array.
-  static uint32_t ClassSize(size_t pointer_size);
+  static uint32_t ClassSize(PointerSize pointer_size);
 
   // Allocates an array with the given properties, if kFillUsable is true the array will be of at
   // least component_count size, however, if there's usable space at the end of the allocation the
@@ -186,14 +187,14 @@
   template<typename T,
            VerifyObjectFlags kVerifyFlags = kVerifyNone,
            ReadBarrierOption kReadBarrierOption = kWithReadBarrier>
-  T GetElementPtrSize(uint32_t idx, size_t ptr_size)
+  T GetElementPtrSize(uint32_t idx, PointerSize ptr_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   template<bool kTransactionActive = false, bool kUnchecked = false>
-  void SetElementPtrSize(uint32_t idx, uint64_t element, size_t ptr_size)
+  void SetElementPtrSize(uint32_t idx, uint64_t element, PointerSize ptr_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
   template<bool kTransactionActive = false, bool kUnchecked = false, typename T>
-  void SetElementPtrSize(uint32_t idx, T* element, size_t ptr_size)
+  void SetElementPtrSize(uint32_t idx, T* element, PointerSize ptr_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Fixup the pointers in the dest arrays by passing our pointers through the visitor. Only copies
@@ -201,7 +202,7 @@
   template <VerifyObjectFlags kVerifyFlags = kVerifyNone,
             ReadBarrierOption kReadBarrierOption = kWithReadBarrier,
             typename Visitor>
-  void Fixup(mirror::PointerArray* dest, size_t pointer_size, const Visitor& visitor)
+  void Fixup(mirror::PointerArray* dest, PointerSize pointer_size, const Visitor& visitor)
       SHARED_REQUIRES(Locks::mutator_lock_);
 };
 
diff --git a/runtime/mirror/class-inl.h b/runtime/mirror/class-inl.h
index 9a9fd87..8f5419c 100644
--- a/runtime/mirror/class-inl.h
+++ b/runtime/mirror/class-inl.h
@@ -80,13 +80,12 @@
 }
 
 template<VerifyObjectFlags kVerifyFlags>
-inline ArraySlice<ArtMethod> Class::GetDirectMethodsSlice(size_t pointer_size) {
+inline ArraySlice<ArtMethod> Class::GetDirectMethodsSlice(PointerSize pointer_size) {
   DCHECK(IsLoaded() || IsErroneous());
-  DCHECK(ValidPointerSize(pointer_size)) << pointer_size;
   return GetDirectMethodsSliceUnchecked(pointer_size);
 }
 
-inline ArraySlice<ArtMethod> Class::GetDirectMethodsSliceUnchecked(size_t pointer_size) {
+inline ArraySlice<ArtMethod> Class::GetDirectMethodsSliceUnchecked(PointerSize pointer_size) {
   return ArraySlice<ArtMethod>(GetMethodsPtr(),
                                GetDirectMethodsStartOffset(),
                                GetVirtualMethodsStartOffset(),
@@ -95,13 +94,12 @@
 }
 
 template<VerifyObjectFlags kVerifyFlags>
-inline ArraySlice<ArtMethod> Class::GetDeclaredMethodsSlice(size_t pointer_size) {
+inline ArraySlice<ArtMethod> Class::GetDeclaredMethodsSlice(PointerSize pointer_size) {
   DCHECK(IsLoaded() || IsErroneous());
-  DCHECK(ValidPointerSize(pointer_size)) << pointer_size;
   return GetDeclaredMethodsSliceUnchecked(pointer_size);
 }
 
-inline ArraySlice<ArtMethod> Class::GetDeclaredMethodsSliceUnchecked(size_t pointer_size) {
+inline ArraySlice<ArtMethod> Class::GetDeclaredMethodsSliceUnchecked(PointerSize pointer_size) {
   return ArraySlice<ArtMethod>(GetMethodsPtr(),
                                GetDirectMethodsStartOffset(),
                                GetCopiedMethodsStartOffset(),
@@ -109,13 +107,13 @@
                                ArtMethod::Alignment(pointer_size));
 }
 template<VerifyObjectFlags kVerifyFlags>
-inline ArraySlice<ArtMethod> Class::GetDeclaredVirtualMethodsSlice(size_t pointer_size) {
+inline ArraySlice<ArtMethod> Class::GetDeclaredVirtualMethodsSlice(PointerSize pointer_size) {
   DCHECK(IsLoaded() || IsErroneous());
-  DCHECK(ValidPointerSize(pointer_size)) << pointer_size;
   return GetDeclaredVirtualMethodsSliceUnchecked(pointer_size);
 }
 
-inline ArraySlice<ArtMethod> Class::GetDeclaredVirtualMethodsSliceUnchecked(size_t pointer_size) {
+inline ArraySlice<ArtMethod> Class::GetDeclaredVirtualMethodsSliceUnchecked(
+    PointerSize pointer_size) {
   return ArraySlice<ArtMethod>(GetMethodsPtr(),
                                GetVirtualMethodsStartOffset(),
                                GetCopiedMethodsStartOffset(),
@@ -124,13 +122,12 @@
 }
 
 template<VerifyObjectFlags kVerifyFlags>
-inline ArraySlice<ArtMethod> Class::GetVirtualMethodsSlice(size_t pointer_size) {
+inline ArraySlice<ArtMethod> Class::GetVirtualMethodsSlice(PointerSize pointer_size) {
   DCHECK(IsLoaded() || IsErroneous());
-  DCHECK(ValidPointerSize(pointer_size)) << pointer_size;
   return GetVirtualMethodsSliceUnchecked(pointer_size);
 }
 
-inline ArraySlice<ArtMethod> Class::GetVirtualMethodsSliceUnchecked(size_t pointer_size) {
+inline ArraySlice<ArtMethod> Class::GetVirtualMethodsSliceUnchecked(PointerSize pointer_size) {
   LengthPrefixedArray<ArtMethod>* methods = GetMethodsPtr();
   return ArraySlice<ArtMethod>(methods,
                                GetVirtualMethodsStartOffset(),
@@ -140,13 +137,12 @@
 }
 
 template<VerifyObjectFlags kVerifyFlags>
-inline ArraySlice<ArtMethod> Class::GetCopiedMethodsSlice(size_t pointer_size) {
+inline ArraySlice<ArtMethod> Class::GetCopiedMethodsSlice(PointerSize pointer_size) {
   DCHECK(IsLoaded() || IsErroneous());
-  DCHECK(ValidPointerSize(pointer_size)) << pointer_size;
   return GetCopiedMethodsSliceUnchecked(pointer_size);
 }
 
-inline ArraySlice<ArtMethod> Class::GetCopiedMethodsSliceUnchecked(size_t pointer_size) {
+inline ArraySlice<ArtMethod> Class::GetCopiedMethodsSliceUnchecked(PointerSize pointer_size) {
   LengthPrefixedArray<ArtMethod>* methods = GetMethodsPtr();
   return ArraySlice<ArtMethod>(methods,
                                GetCopiedMethodsStartOffset(),
@@ -161,7 +157,7 @@
 }
 
 template<VerifyObjectFlags kVerifyFlags>
-inline ArraySlice<ArtMethod> Class::GetMethodsSlice(size_t pointer_size) {
+inline ArraySlice<ArtMethod> Class::GetMethodsSlice(PointerSize pointer_size) {
   DCHECK(IsLoaded() || IsErroneous());
   LengthPrefixedArray<ArtMethod>* methods = GetMethodsPtr();
   return ArraySlice<ArtMethod>(methods,
@@ -177,12 +173,12 @@
   return (methods == nullptr) ? 0 : methods->size();
 }
 
-inline ArtMethod* Class::GetDirectMethodUnchecked(size_t i, size_t pointer_size) {
+inline ArtMethod* Class::GetDirectMethodUnchecked(size_t i, PointerSize pointer_size) {
   CheckPointerSize(pointer_size);
   return &GetDirectMethodsSliceUnchecked(pointer_size).At(i);
 }
 
-inline ArtMethod* Class::GetDirectMethod(size_t i, size_t pointer_size) {
+inline ArtMethod* Class::GetDirectMethod(size_t i, PointerSize pointer_size) {
   CheckPointerSize(pointer_size);
   return &GetDirectMethodsSlice(pointer_size).At(i);
 }
@@ -212,20 +208,20 @@
 }
 
 template<VerifyObjectFlags kVerifyFlags>
-inline ArtMethod* Class::GetVirtualMethod(size_t i, size_t pointer_size) {
+inline ArtMethod* Class::GetVirtualMethod(size_t i, PointerSize pointer_size) {
   CheckPointerSize(pointer_size);
   DCHECK(IsResolved<kVerifyFlags>() || IsErroneous<kVerifyFlags>())
       << PrettyClass(this) << " status=" << GetStatus();
   return GetVirtualMethodUnchecked(i, pointer_size);
 }
 
-inline ArtMethod* Class::GetVirtualMethodDuringLinking(size_t i, size_t pointer_size) {
+inline ArtMethod* Class::GetVirtualMethodDuringLinking(size_t i, PointerSize pointer_size) {
   CheckPointerSize(pointer_size);
   DCHECK(IsLoaded() || IsErroneous());
   return GetVirtualMethodUnchecked(i, pointer_size);
 }
 
-inline ArtMethod* Class::GetVirtualMethodUnchecked(size_t i, size_t pointer_size) {
+inline ArtMethod* Class::GetVirtualMethodUnchecked(size_t i, PointerSize pointer_size) {
   CheckPointerSize(pointer_size);
   return &GetVirtualMethodsSliceUnchecked(pointer_size).At(i);
 }
@@ -258,7 +254,7 @@
   return GetVTable() != nullptr ? GetVTable()->GetLength() : 0;
 }
 
-inline ArtMethod* Class::GetVTableEntry(uint32_t i, size_t pointer_size) {
+inline ArtMethod* Class::GetVTableEntry(uint32_t i, PointerSize pointer_size) {
   if (ShouldHaveEmbeddedVTable()) {
     return GetEmbeddedVTableEntry(i, pointer_size);
   }
@@ -275,29 +271,29 @@
   SetField32<false>(MemberOffset(EmbeddedVTableLengthOffset()), len);
 }
 
-inline ImTable* Class::GetImt(size_t pointer_size) {
+inline ImTable* Class::GetImt(PointerSize pointer_size) {
   return GetFieldPtrWithSize<ImTable*>(MemberOffset(ImtPtrOffset(pointer_size)), pointer_size);
 }
 
-inline void Class::SetImt(ImTable* imt, size_t pointer_size) {
+inline void Class::SetImt(ImTable* imt, PointerSize pointer_size) {
   return SetFieldPtrWithSize<false>(MemberOffset(ImtPtrOffset(pointer_size)), imt, pointer_size);
 }
 
-inline MemberOffset Class::EmbeddedVTableEntryOffset(uint32_t i, size_t pointer_size) {
+inline MemberOffset Class::EmbeddedVTableEntryOffset(uint32_t i, PointerSize pointer_size) {
   return MemberOffset(
       EmbeddedVTableOffset(pointer_size).Uint32Value() + i * VTableEntrySize(pointer_size));
 }
 
-inline ArtMethod* Class::GetEmbeddedVTableEntry(uint32_t i, size_t pointer_size) {
+inline ArtMethod* Class::GetEmbeddedVTableEntry(uint32_t i, PointerSize pointer_size) {
   return GetFieldPtrWithSize<ArtMethod*>(EmbeddedVTableEntryOffset(i, pointer_size), pointer_size);
 }
 
 inline void Class::SetEmbeddedVTableEntryUnchecked(
-    uint32_t i, ArtMethod* method, size_t pointer_size) {
+    uint32_t i, ArtMethod* method, PointerSize pointer_size) {
   SetFieldPtrWithSize<false>(EmbeddedVTableEntryOffset(i, pointer_size), method, pointer_size);
 }
 
-inline void Class::SetEmbeddedVTableEntry(uint32_t i, ArtMethod* method, size_t pointer_size) {
+inline void Class::SetEmbeddedVTableEntry(uint32_t i, ArtMethod* method, PointerSize pointer_size) {
   auto* vtable = GetVTableDuringLinking();
   CHECK_EQ(method, vtable->GetElementPtrSize<ArtMethod*>(i, pointer_size));
   SetEmbeddedVTableEntryUnchecked(i, method, pointer_size);
@@ -453,7 +449,8 @@
   return false;
 }
 
-inline ArtMethod* Class::FindVirtualMethodForInterface(ArtMethod* method, size_t pointer_size) {
+inline ArtMethod* Class::FindVirtualMethodForInterface(ArtMethod* method,
+                                                       PointerSize pointer_size) {
   Class* declaring_class = method->GetDeclaringClass();
   DCHECK(declaring_class != nullptr) << PrettyClass(this);
   DCHECK(declaring_class->IsInterface()) << PrettyMethod(method);
@@ -470,7 +467,7 @@
   return nullptr;
 }
 
-inline ArtMethod* Class::FindVirtualMethodForVirtual(ArtMethod* method, size_t pointer_size) {
+inline ArtMethod* Class::FindVirtualMethodForVirtual(ArtMethod* method, PointerSize pointer_size) {
   // Only miranda or default methods may come from interfaces and be used as a virtual.
   DCHECK(!method->GetDeclaringClass()->IsInterface() || method->IsDefault() || method->IsMiranda());
   // The argument method may from a super class.
@@ -478,13 +475,13 @@
   return GetVTableEntry(method->GetMethodIndex(), pointer_size);
 }
 
-inline ArtMethod* Class::FindVirtualMethodForSuper(ArtMethod* method, size_t pointer_size) {
+inline ArtMethod* Class::FindVirtualMethodForSuper(ArtMethod* method, PointerSize pointer_size) {
   DCHECK(!method->GetDeclaringClass()->IsInterface());
   return GetSuperClass()->GetVTableEntry(method->GetMethodIndex(), pointer_size);
 }
 
 inline ArtMethod* Class::FindVirtualMethodForVirtualOrInterface(ArtMethod* method,
-                                                                size_t pointer_size) {
+                                                                PointerSize pointer_size) {
   if (method->IsDirect()) {
     return method;
   }
@@ -528,7 +525,7 @@
 }
 
 template <VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
-inline MemberOffset Class::GetFirstReferenceStaticFieldOffset(size_t pointer_size) {
+inline MemberOffset Class::GetFirstReferenceStaticFieldOffset(PointerSize pointer_size) {
   DCHECK(IsResolved());
   uint32_t base = sizeof(mirror::Class);  // Static fields come after the class.
   if (ShouldHaveEmbeddedVTable<kVerifyFlags, kReadBarrierOption>()) {
@@ -539,7 +536,8 @@
   return MemberOffset(base);
 }
 
-inline MemberOffset Class::GetFirstReferenceStaticFieldOffsetDuringLinking(size_t pointer_size) {
+inline MemberOffset Class::GetFirstReferenceStaticFieldOffsetDuringLinking(
+    PointerSize pointer_size) {
   DCHECK(IsLoaded());
   uint32_t base = sizeof(mirror::Class);  // Static fields come after the class.
   if (ShouldHaveEmbeddedVTable()) {
@@ -708,13 +706,13 @@
                                         uint32_t num_32bit_static_fields,
                                         uint32_t num_64bit_static_fields,
                                         uint32_t num_ref_static_fields,
-                                        size_t pointer_size) {
+                                        PointerSize pointer_size) {
   // Space used by java.lang.Class and its instance fields.
   uint32_t size = sizeof(Class);
   // Space used by embedded tables.
   if (has_embedded_vtable) {
-    size = RoundUp(size + sizeof(uint32_t), pointer_size);
-    size += pointer_size;  // size of pointer to IMT
+    size = RoundUp(size + sizeof(uint32_t), static_cast<size_t>(pointer_size));
+    size += static_cast<size_t>(pointer_size);  // size of pointer to IMT
     size += num_vtable_entries * VTableEntrySize(pointer_size);
   }
 
@@ -908,7 +906,7 @@
 }
 
 template<ReadBarrierOption kReadBarrierOption, class Visitor>
-void mirror::Class::VisitNativeRoots(Visitor& visitor, size_t pointer_size) {
+void mirror::Class::VisitNativeRoots(Visitor& visitor, PointerSize pointer_size) {
   for (ArtField& field : GetSFieldsUnchecked()) {
     // Visit roots first in case the declaring class gets moved.
     field.VisitRoots(visitor);
@@ -928,35 +926,34 @@
   }
 }
 
-inline IterationRange<StrideIterator<ArtMethod>> Class::GetDirectMethods(size_t pointer_size) {
+inline IterationRange<StrideIterator<ArtMethod>> Class::GetDirectMethods(PointerSize pointer_size) {
   CheckPointerSize(pointer_size);
   return GetDirectMethodsSliceUnchecked(pointer_size).AsRange();
 }
 
 inline IterationRange<StrideIterator<ArtMethod>> Class::GetDeclaredMethods(
-      size_t pointer_size) {
-  CheckPointerSize(pointer_size);
+      PointerSize pointer_size) {
   return GetDeclaredMethodsSliceUnchecked(pointer_size).AsRange();
 }
 
 inline IterationRange<StrideIterator<ArtMethod>> Class::GetDeclaredVirtualMethods(
-      size_t pointer_size) {
-  CheckPointerSize(pointer_size);
+      PointerSize pointer_size) {
   return GetDeclaredVirtualMethodsSliceUnchecked(pointer_size).AsRange();
 }
 
-inline IterationRange<StrideIterator<ArtMethod>> Class::GetVirtualMethods(size_t pointer_size) {
+inline IterationRange<StrideIterator<ArtMethod>> Class::GetVirtualMethods(
+    PointerSize pointer_size) {
   CheckPointerSize(pointer_size);
   return GetVirtualMethodsSliceUnchecked(pointer_size).AsRange();
 }
 
-inline IterationRange<StrideIterator<ArtMethod>> Class::GetCopiedMethods(size_t pointer_size) {
+inline IterationRange<StrideIterator<ArtMethod>> Class::GetCopiedMethods(PointerSize pointer_size) {
   CheckPointerSize(pointer_size);
   return GetCopiedMethodsSliceUnchecked(pointer_size).AsRange();
 }
 
 
-inline IterationRange<StrideIterator<ArtMethod>> Class::GetMethods(size_t pointer_size) {
+inline IterationRange<StrideIterator<ArtMethod>> Class::GetMethods(PointerSize pointer_size) {
   CheckPointerSize(pointer_size);
   return MakeIterationRangeFromLengthPrefixedArray(GetMethodsPtr(),
                                                    ArtMethod::Size(pointer_size),
@@ -979,13 +976,12 @@
   return MakeIterationRangeFromLengthPrefixedArray(GetSFieldsPtrUnchecked());
 }
 
-inline MemberOffset Class::EmbeddedVTableOffset(size_t pointer_size) {
+inline MemberOffset Class::EmbeddedVTableOffset(PointerSize pointer_size) {
   CheckPointerSize(pointer_size);
-  return MemberOffset(ImtPtrOffset(pointer_size).Uint32Value() + pointer_size);
+  return MemberOffset(ImtPtrOffset(pointer_size).Uint32Value() + static_cast<size_t>(pointer_size));
 }
 
-inline void Class::CheckPointerSize(size_t pointer_size) {
-  DCHECK(ValidPointerSize(pointer_size)) << pointer_size;
+inline void Class::CheckPointerSize(PointerSize pointer_size) {
   DCHECK_EQ(pointer_size, Runtime::Current()->GetClassLinker()->GetImagePointerSize());
 }
 
@@ -1040,7 +1036,7 @@
 
 template <VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption, typename Visitor>
 inline void Class::FixupNativePointers(mirror::Class* dest,
-                                       size_t pointer_size,
+                                       PointerSize pointer_size,
                                        const Visitor& visitor) {
   // Update the field arrays.
   LengthPrefixedArray<ArtField>* const sfields = GetSFieldsPtr();
diff --git a/runtime/mirror/class.cc b/runtime/mirror/class.cc
index 375cb2f..f948be7 100644
--- a/runtime/mirror/class.cc
+++ b/runtime/mirror/class.cc
@@ -334,8 +334,9 @@
   }
 }
 
-ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const StringPiece& signature,
-                                      size_t pointer_size) {
+ArtMethod* Class::FindInterfaceMethod(const StringPiece& name,
+                                      const StringPiece& signature,
+                                      PointerSize pointer_size) {
   // Check the current class before checking the interfaces.
   ArtMethod* method = FindDeclaredVirtualMethod(name, signature, pointer_size);
   if (method != nullptr) {
@@ -353,8 +354,9 @@
   return nullptr;
 }
 
-ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const Signature& signature,
-                                      size_t pointer_size) {
+ArtMethod* Class::FindInterfaceMethod(const StringPiece& name,
+                                      const Signature& signature,
+                                      PointerSize pointer_size) {
   // Check the current class before checking the interfaces.
   ArtMethod* method = FindDeclaredVirtualMethod(name, signature, pointer_size);
   if (method != nullptr) {
@@ -372,8 +374,9 @@
   return nullptr;
 }
 
-ArtMethod* Class::FindInterfaceMethod(const DexCache* dex_cache, uint32_t dex_method_idx,
-                                      size_t pointer_size) {
+ArtMethod* Class::FindInterfaceMethod(const DexCache* dex_cache,
+                                      uint32_t dex_method_idx,
+                                      PointerSize pointer_size) {
   // Check the current class before checking the interfaces.
   ArtMethod* method = FindDeclaredVirtualMethod(dex_cache, dex_method_idx, pointer_size);
   if (method != nullptr) {
@@ -392,8 +395,9 @@
   return nullptr;
 }
 
-ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const StringPiece& signature,
-                                           size_t pointer_size) {
+ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name,
+                                           const StringPiece& signature,
+                                           PointerSize pointer_size) {
   for (auto& method : GetDirectMethods(pointer_size)) {
     if (name == method.GetName() && method.GetSignature() == signature) {
       return &method;
@@ -402,8 +406,9 @@
   return nullptr;
 }
 
-ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const Signature& signature,
-                                           size_t pointer_size) {
+ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name,
+                                           const Signature& signature,
+                                           PointerSize pointer_size) {
   for (auto& method : GetDirectMethods(pointer_size)) {
     if (name == method.GetName() && signature == method.GetSignature()) {
       return &method;
@@ -412,8 +417,9 @@
   return nullptr;
 }
 
-ArtMethod* Class::FindDeclaredDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx,
-                                           size_t pointer_size) {
+ArtMethod* Class::FindDeclaredDirectMethod(const DexCache* dex_cache,
+                                           uint32_t dex_method_idx,
+                                           PointerSize pointer_size) {
   if (GetDexCache() == dex_cache) {
     for (auto& method : GetDirectMethods(pointer_size)) {
       if (method.GetDexMethodIndex() == dex_method_idx) {
@@ -424,8 +430,9 @@
   return nullptr;
 }
 
-ArtMethod* Class::FindDirectMethod(const StringPiece& name, const StringPiece& signature,
-                                   size_t pointer_size) {
+ArtMethod* Class::FindDirectMethod(const StringPiece& name,
+                                   const StringPiece& signature,
+                                   PointerSize pointer_size) {
   for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
     ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature, pointer_size);
     if (method != nullptr) {
@@ -435,8 +442,9 @@
   return nullptr;
 }
 
-ArtMethod* Class::FindDirectMethod(const StringPiece& name, const Signature& signature,
-                                   size_t pointer_size) {
+ArtMethod* Class::FindDirectMethod(const StringPiece& name,
+                                   const Signature& signature,
+                                   PointerSize pointer_size) {
   for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
     ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature, pointer_size);
     if (method != nullptr) {
@@ -447,7 +455,7 @@
 }
 
 ArtMethod* Class::FindDirectMethod(
-    const DexCache* dex_cache, uint32_t dex_method_idx, size_t pointer_size) {
+    const DexCache* dex_cache, uint32_t dex_method_idx, PointerSize pointer_size) {
   for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
     ArtMethod* method = klass->FindDeclaredDirectMethod(dex_cache, dex_method_idx, pointer_size);
     if (method != nullptr) {
@@ -457,7 +465,8 @@
   return nullptr;
 }
 
-ArtMethod* Class::FindDeclaredDirectMethodByName(const StringPiece& name, size_t pointer_size) {
+ArtMethod* Class::FindDeclaredDirectMethodByName(const StringPiece& name,
+                                                 PointerSize pointer_size) {
   for (auto& method : GetDirectMethods(pointer_size)) {
     ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size);
     if (name == np_method->GetName()) {
@@ -471,8 +480,9 @@
 // because they do not only find 'declared' methods and will return copied methods. This behavior is
 // desired and correct but the naming can lead to confusion because in the java language declared
 // excludes interface methods which might be found by this.
-ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const StringPiece& signature,
-                                            size_t pointer_size) {
+ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name,
+                                            const StringPiece& signature,
+                                            PointerSize pointer_size) {
   for (auto& method : GetVirtualMethods(pointer_size)) {
     ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size);
     if (name == np_method->GetName() && np_method->GetSignature() == signature) {
@@ -482,8 +492,9 @@
   return nullptr;
 }
 
-ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const Signature& signature,
-                                            size_t pointer_size) {
+ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name,
+                                            const Signature& signature,
+                                            PointerSize pointer_size) {
   for (auto& method : GetVirtualMethods(pointer_size)) {
     ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size);
     if (name == np_method->GetName() && signature == np_method->GetSignature()) {
@@ -493,8 +504,9 @@
   return nullptr;
 }
 
-ArtMethod* Class::FindDeclaredVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx,
-                                            size_t pointer_size) {
+ArtMethod* Class::FindDeclaredVirtualMethod(const DexCache* dex_cache,
+                                            uint32_t dex_method_idx,
+                                            PointerSize pointer_size) {
   if (GetDexCache() == dex_cache) {
     for (auto& method : GetDeclaredVirtualMethods(pointer_size)) {
       if (method.GetDexMethodIndex() == dex_method_idx) {
@@ -505,7 +517,8 @@
   return nullptr;
 }
 
-ArtMethod* Class::FindDeclaredVirtualMethodByName(const StringPiece& name, size_t pointer_size) {
+ArtMethod* Class::FindDeclaredVirtualMethodByName(const StringPiece& name,
+                                                  PointerSize pointer_size) {
   for (auto& method : GetVirtualMethods(pointer_size)) {
     ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size);
     if (name == np_method->GetName()) {
@@ -516,7 +529,7 @@
 }
 
 ArtMethod* Class::FindVirtualMethod(
-    const StringPiece& name, const StringPiece& signature, size_t pointer_size) {
+    const StringPiece& name, const StringPiece& signature, PointerSize pointer_size) {
   for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
     ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature, pointer_size);
     if (method != nullptr) {
@@ -527,7 +540,7 @@
 }
 
 ArtMethod* Class::FindVirtualMethod(
-    const StringPiece& name, const Signature& signature, size_t pointer_size) {
+    const StringPiece& name, const Signature& signature, PointerSize pointer_size) {
   for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
     ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature, pointer_size);
     if (method != nullptr) {
@@ -538,7 +551,7 @@
 }
 
 ArtMethod* Class::FindVirtualMethod(
-    const DexCache* dex_cache, uint32_t dex_method_idx, size_t pointer_size) {
+    const DexCache* dex_cache, uint32_t dex_method_idx, PointerSize pointer_size) {
   for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
     ArtMethod* method = klass->FindDeclaredVirtualMethod(dex_cache, dex_method_idx, pointer_size);
     if (method != nullptr) {
@@ -548,7 +561,7 @@
   return nullptr;
 }
 
-ArtMethod* Class::FindVirtualMethodForInterfaceSuper(ArtMethod* method, size_t pointer_size) {
+ArtMethod* Class::FindVirtualMethodForInterfaceSuper(ArtMethod* method, PointerSize pointer_size) {
   DCHECK(method->GetDeclaringClass()->IsInterface());
   DCHECK(IsInterface()) << "Should only be called on a interface class";
   // Check if we have one defined on this interface first. This includes searching copied ones to
@@ -613,7 +626,7 @@
   return abstract_methods.empty() ? nullptr : abstract_methods[0];
 }
 
-ArtMethod* Class::FindClassInitializer(size_t pointer_size) {
+ArtMethod* Class::FindClassInitializer(PointerSize pointer_size) {
   for (ArtMethod& method : GetDirectMethods(pointer_size)) {
     if (method.IsClassInitializer()) {
       DCHECK_STREQ(method.GetName(), "<clinit>");
@@ -803,7 +816,7 @@
   return nullptr;
 }
 
-void Class::SetSkipAccessChecksFlagOnAllMethods(size_t pointer_size) {
+void Class::SetSkipAccessChecksFlagOnAllMethods(PointerSize pointer_size) {
   DCHECK(IsVerified());
   for (auto& m : GetMethods(pointer_size)) {
     if (!m.IsNative() && m.IsInvokable()) {
@@ -917,7 +930,7 @@
   return GetDexFile().GetInterfacesList(*class_def);
 }
 
-void Class::PopulateEmbeddedVTable(size_t pointer_size) {
+void Class::PopulateEmbeddedVTable(PointerSize pointer_size) {
   PointerArray* table = GetVTableDuringLinking();
   CHECK(table != nullptr) << PrettyClass(this);
   const size_t table_length = table->GetLength();
@@ -963,9 +976,12 @@
 // The pre-fence visitor for Class::CopyOf().
 class CopyClassVisitor {
  public:
-  CopyClassVisitor(Thread* self, Handle<mirror::Class>* orig, size_t new_length,
-                   size_t copy_bytes, ImTable* imt,
-                   size_t pointer_size)
+  CopyClassVisitor(Thread* self,
+                   Handle<mirror::Class>* orig,
+                   size_t new_length,
+                   size_t copy_bytes,
+                   ImTable* imt,
+                   PointerSize pointer_size)
       : self_(self), orig_(orig), new_length_(new_length),
         copy_bytes_(copy_bytes), imt_(imt), pointer_size_(pointer_size) {
   }
@@ -991,12 +1007,11 @@
   const size_t new_length_;
   const size_t copy_bytes_;
   ImTable* imt_;
-  const size_t pointer_size_;
+  const PointerSize pointer_size_;
   DISALLOW_COPY_AND_ASSIGN(CopyClassVisitor);
 };
 
-Class* Class::CopyOf(Thread* self, int32_t new_length,
-                     ImTable* imt, size_t pointer_size) {
+Class* Class::CopyOf(Thread* self, int32_t new_length, ImTable* imt, PointerSize pointer_size) {
   DCHECK_GE(new_length, static_cast<int32_t>(sizeof(Class)));
   // We may get copied by a compacting GC.
   StackHandleScope<1> hs(self);
@@ -1022,14 +1037,14 @@
 
 // TODO: Move this to java_lang_Class.cc?
 ArtMethod* Class::GetDeclaredConstructor(
-    Thread* self, Handle<mirror::ObjectArray<mirror::Class>> args, size_t pointer_size) {
+    Thread* self, Handle<mirror::ObjectArray<mirror::Class>> args, PointerSize pointer_size) {
   for (auto& m : GetDirectMethods(pointer_size)) {
     // Skip <clinit> which is a static constructor, as well as non constructors.
     if (m.IsStatic() || !m.IsConstructor()) {
       continue;
     }
     // May cause thread suspension and exceptions.
-    if (m.GetInterfaceMethodIfProxy(sizeof(void*))->EqualParameters(args)) {
+    if (m.GetInterfaceMethodIfProxy(kRuntimePointerSize)->EqualParameters(args)) {
       return &m;
     }
     if (UNLIKELY(self->IsExceptionPending())) {
@@ -1053,7 +1068,7 @@
   return (type_id == nullptr) ? DexFile::kDexNoIndex : dex_file.GetIndexForTypeId(*type_id);
 }
 
-template <size_t kPointerSize, bool kTransactionActive>
+template <PointerSize kPointerSize, bool kTransactionActive>
 mirror::Method* Class::GetDeclaredMethodInternal(Thread* self,
                                                  mirror::Class* klass,
                                                  mirror::String* name,
@@ -1124,31 +1139,31 @@
 }
 
 template
-mirror::Method* Class::GetDeclaredMethodInternal<4U, false>(
+mirror::Method* Class::GetDeclaredMethodInternal<PointerSize::k32, false>(
     Thread* self,
     mirror::Class* klass,
     mirror::String* name,
     mirror::ObjectArray<mirror::Class>* args);
 template
-mirror::Method* Class::GetDeclaredMethodInternal<4U, true>(
+mirror::Method* Class::GetDeclaredMethodInternal<PointerSize::k32, true>(
     Thread* self,
     mirror::Class* klass,
     mirror::String* name,
     mirror::ObjectArray<mirror::Class>* args);
 template
-mirror::Method* Class::GetDeclaredMethodInternal<8U, false>(
+mirror::Method* Class::GetDeclaredMethodInternal<PointerSize::k64, false>(
     Thread* self,
     mirror::Class* klass,
     mirror::String* name,
     mirror::ObjectArray<mirror::Class>* args);
 template
-mirror::Method* Class::GetDeclaredMethodInternal<8U, true>(
+mirror::Method* Class::GetDeclaredMethodInternal<PointerSize::k64, true>(
     Thread* self,
     mirror::Class* klass,
     mirror::String* name,
     mirror::ObjectArray<mirror::Class>* args);
 
-template <size_t kPointerSize, bool kTransactionActive>
+template <PointerSize kPointerSize, bool kTransactionActive>
 mirror::Constructor* Class::GetDeclaredConstructorInternal(
     Thread* self,
     mirror::Class* klass,
@@ -1162,19 +1177,23 @@
 
 // mirror::Constructor::CreateFromArtMethod<kTransactionActive>(self, result)
 
-template mirror::Constructor* Class::GetDeclaredConstructorInternal<4U, false>(
+template
+mirror::Constructor* Class::GetDeclaredConstructorInternal<PointerSize::k32, false>(
     Thread* self,
     mirror::Class* klass,
     mirror::ObjectArray<mirror::Class>* args);
-template mirror::Constructor* Class::GetDeclaredConstructorInternal<4U, true>(
+template
+mirror::Constructor* Class::GetDeclaredConstructorInternal<PointerSize::k32, true>(
     Thread* self,
     mirror::Class* klass,
     mirror::ObjectArray<mirror::Class>* args);
-template mirror::Constructor* Class::GetDeclaredConstructorInternal<8U, false>(
+template
+mirror::Constructor* Class::GetDeclaredConstructorInternal<PointerSize::k64, false>(
     Thread* self,
     mirror::Class* klass,
     mirror::ObjectArray<mirror::Class>* args);
-template mirror::Constructor* Class::GetDeclaredConstructorInternal<8U, true>(
+template
+mirror::Constructor* Class::GetDeclaredConstructorInternal<PointerSize::k64, true>(
     Thread* self,
     mirror::Class* klass,
     mirror::ObjectArray<mirror::Class>* args);
diff --git a/runtime/mirror/class.h b/runtime/mirror/class.h
index 3ba9e1a..5c490de 100644
--- a/runtime/mirror/class.h
+++ b/runtime/mirror/class.h
@@ -17,6 +17,7 @@
 #ifndef ART_RUNTIME_MIRROR_CLASS_H_
 #define ART_RUNTIME_MIRROR_CLASS_H_
 
+#include "base/enums.h"
 #include "base/iteration_range.h"
 #include "dex_file.h"
 #include "class_flags.h"
@@ -556,17 +557,17 @@
                                    uint32_t num_32bit_static_fields,
                                    uint32_t num_64bit_static_fields,
                                    uint32_t num_ref_static_fields,
-                                   size_t pointer_size);
+                                   PointerSize pointer_size);
 
   // The size of java.lang.Class.class.
-  static uint32_t ClassClassSize(size_t pointer_size) {
+  static uint32_t ClassClassSize(PointerSize pointer_size) {
     // The number of vtable entries in java.lang.Class.
     uint32_t vtable_entries = Object::kVTableLength + 72;
     return ComputeClassSize(true, vtable_entries, 0, 0, 4, 1, 0, pointer_size);
   }
 
   // The size of a java.lang.Class representing a primitive such as int.class.
-  static uint32_t PrimitiveClassSize(size_t pointer_size) {
+  static uint32_t PrimitiveClassSize(PointerSize pointer_size) {
     return ComputeClassSize(false, 0, 0, 0, 0, 0, 0, pointer_size);
   }
 
@@ -703,7 +704,7 @@
   // Also updates the dex_cache_strings_ variable from new_dex_cache.
   void SetDexCache(DexCache* new_dex_cache) SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ALWAYS_INLINE IterationRange<StrideIterator<ArtMethod>> GetDirectMethods(size_t pointer_size)
+  ALWAYS_INLINE IterationRange<StrideIterator<ArtMethod>> GetDirectMethods(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ALWAYS_INLINE LengthPrefixedArray<ArtMethod>* GetMethodsPtr()
@@ -713,7 +714,7 @@
     return MemberOffset(OFFSETOF_MEMBER(Class, methods_));
   }
 
-  ALWAYS_INLINE IterationRange<StrideIterator<ArtMethod>> GetMethods(size_t pointer_size)
+  ALWAYS_INLINE IterationRange<StrideIterator<ArtMethod>> GetMethods(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   void SetMethodsPtr(LengthPrefixedArray<ArtMethod>* new_methods,
@@ -727,65 +728,66 @@
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags>
-  ALWAYS_INLINE ArraySlice<ArtMethod> GetDirectMethodsSlice(size_t pointer_size)
+  ALWAYS_INLINE ArraySlice<ArtMethod> GetDirectMethodsSlice(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ALWAYS_INLINE ArtMethod* GetDirectMethod(size_t i, size_t pointer_size)
+  ALWAYS_INLINE ArtMethod* GetDirectMethod(size_t i, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Use only when we are allocating populating the method arrays.
-  ALWAYS_INLINE ArtMethod* GetDirectMethodUnchecked(size_t i, size_t pointer_size)
+  ALWAYS_INLINE ArtMethod* GetDirectMethodUnchecked(size_t i, PointerSize pointer_size)
         SHARED_REQUIRES(Locks::mutator_lock_);
-  ALWAYS_INLINE ArtMethod* GetVirtualMethodUnchecked(size_t i, size_t pointer_size)
+  ALWAYS_INLINE ArtMethod* GetVirtualMethodUnchecked(size_t i, PointerSize pointer_size)
         SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Returns the number of static, private, and constructor methods.
   ALWAYS_INLINE uint32_t NumDirectMethods() SHARED_REQUIRES(Locks::mutator_lock_);
 
   template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags>
-  ALWAYS_INLINE ArraySlice<ArtMethod> GetMethodsSlice(size_t pointer_size)
+  ALWAYS_INLINE ArraySlice<ArtMethod> GetMethodsSlice(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags>
-  ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredMethodsSlice(size_t pointer_size)
+  ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredMethodsSlice(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ALWAYS_INLINE IterationRange<StrideIterator<ArtMethod>> GetDeclaredMethods(
-        size_t pointer_size)
+        PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  template <size_t kPointerSize, bool kTransactionActive>
+  template <PointerSize kPointerSize, bool kTransactionActive>
   static Method* GetDeclaredMethodInternal(Thread* self,
                                            mirror::Class* klass,
                                            mirror::String* name,
                                            mirror::ObjectArray<mirror::Class>* args)
       SHARED_REQUIRES(Locks::mutator_lock_);
-  template <size_t kPointerSize, bool kTransactionActive>
+  template <PointerSize kPointerSize, bool kTransactionActive>
   static Constructor* GetDeclaredConstructorInternal(Thread* self,
                                                      mirror::Class* klass,
                                                      mirror::ObjectArray<mirror::Class>* args)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags>
-  ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredVirtualMethodsSlice(size_t pointer_size)
+  ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredVirtualMethodsSlice(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ALWAYS_INLINE IterationRange<StrideIterator<ArtMethod>> GetDeclaredVirtualMethods(
-        size_t pointer_size)
+        PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags>
-  ALWAYS_INLINE ArraySlice<ArtMethod> GetCopiedMethodsSlice(size_t pointer_size)
+  ALWAYS_INLINE ArraySlice<ArtMethod> GetCopiedMethodsSlice(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ALWAYS_INLINE IterationRange<StrideIterator<ArtMethod>> GetCopiedMethods(size_t pointer_size)
+  ALWAYS_INLINE IterationRange<StrideIterator<ArtMethod>> GetCopiedMethods(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags>
-  ALWAYS_INLINE ArraySlice<ArtMethod> GetVirtualMethodsSlice(size_t pointer_size)
+  ALWAYS_INLINE ArraySlice<ArtMethod> GetVirtualMethodsSlice(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ALWAYS_INLINE IterationRange<StrideIterator<ArtMethod>> GetVirtualMethods(size_t pointer_size)
+  ALWAYS_INLINE IterationRange<StrideIterator<ArtMethod>> GetVirtualMethods(
+      PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Returns the number of non-inherited virtual methods (sum of declared and copied methods).
@@ -800,10 +802,10 @@
   ALWAYS_INLINE uint32_t NumMethods() SHARED_REQUIRES(Locks::mutator_lock_);
 
   template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags>
-  ArtMethod* GetVirtualMethod(size_t i, size_t pointer_size)
+  ArtMethod* GetVirtualMethod(size_t i, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ArtMethod* GetVirtualMethodDuringLinking(size_t i, size_t pointer_size)
+  ArtMethod* GetVirtualMethodDuringLinking(size_t i, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags,
@@ -822,9 +824,10 @@
     return MemberOffset(sizeof(Class));
   }
 
-  static MemberOffset ImtPtrOffset(size_t pointer_size) {
+  static MemberOffset ImtPtrOffset(PointerSize pointer_size) {
     return MemberOffset(
-        RoundUp(EmbeddedVTableLengthOffset().Uint32Value() + sizeof(uint32_t), pointer_size));
+        RoundUp(EmbeddedVTableLengthOffset().Uint32Value() + sizeof(uint32_t),
+                static_cast<size_t>(pointer_size)));
   }
 
   template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags,
@@ -841,124 +844,126 @@
 
   bool HasVTable() SHARED_REQUIRES(Locks::mutator_lock_);
 
-  static MemberOffset EmbeddedVTableEntryOffset(uint32_t i, size_t pointer_size);
+  static MemberOffset EmbeddedVTableEntryOffset(uint32_t i, PointerSize pointer_size);
 
   int32_t GetVTableLength() SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ArtMethod* GetVTableEntry(uint32_t i, size_t pointer_size)
+  ArtMethod* GetVTableEntry(uint32_t i, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   int32_t GetEmbeddedVTableLength() SHARED_REQUIRES(Locks::mutator_lock_);
 
   void SetEmbeddedVTableLength(int32_t len) SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ImTable* GetImt(size_t pointer_size) SHARED_REQUIRES(Locks::mutator_lock_);
+  ImTable* GetImt(PointerSize pointer_size) SHARED_REQUIRES(Locks::mutator_lock_);
 
-  void SetImt(ImTable* imt, size_t pointer_size) SHARED_REQUIRES(Locks::mutator_lock_);
+  void SetImt(ImTable* imt, PointerSize pointer_size) SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ArtMethod* GetEmbeddedVTableEntry(uint32_t i, size_t pointer_size)
+  ArtMethod* GetEmbeddedVTableEntry(uint32_t i, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  void SetEmbeddedVTableEntry(uint32_t i, ArtMethod* method, size_t pointer_size)
+  void SetEmbeddedVTableEntry(uint32_t i, ArtMethod* method, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  inline void SetEmbeddedVTableEntryUnchecked(uint32_t i, ArtMethod* method, size_t pointer_size)
+  inline void SetEmbeddedVTableEntryUnchecked(uint32_t i,
+                                              ArtMethod* method,
+                                              PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  void PopulateEmbeddedVTable(size_t pointer_size)
+  void PopulateEmbeddedVTable(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Given a method implemented by this class but potentially from a super class, return the
   // specific implementation method for this class.
-  ArtMethod* FindVirtualMethodForVirtual(ArtMethod* method, size_t pointer_size)
+  ArtMethod* FindVirtualMethodForVirtual(ArtMethod* method, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Given a method implemented by this class' super class, return the specific implementation
   // method for this class.
-  ArtMethod* FindVirtualMethodForSuper(ArtMethod* method, size_t pointer_size)
+  ArtMethod* FindVirtualMethodForSuper(ArtMethod* method, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Given a method from some implementor of this interface, return the specific implementation
   // method for this class.
-  ArtMethod* FindVirtualMethodForInterfaceSuper(ArtMethod* method, size_t pointer_size)
+  ArtMethod* FindVirtualMethodForInterfaceSuper(ArtMethod* method, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Given a method implemented by this class, but potentially from a
   // super class or interface, return the specific implementation
   // method for this class.
-  ArtMethod* FindVirtualMethodForInterface(ArtMethod* method, size_t pointer_size)
+  ArtMethod* FindVirtualMethodForInterface(ArtMethod* method, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_) ALWAYS_INLINE;
 
-  ArtMethod* FindVirtualMethodForVirtualOrInterface(ArtMethod* method, size_t pointer_size)
+  ArtMethod* FindVirtualMethodForVirtualOrInterface(ArtMethod* method, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindInterfaceMethod(const StringPiece& name, const StringPiece& signature,
-                                 size_t pointer_size)
+                                 PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindInterfaceMethod(const StringPiece& name, const Signature& signature,
-                                 size_t pointer_size)
+                                 PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindInterfaceMethod(const DexCache* dex_cache, uint32_t dex_method_idx,
-                                 size_t pointer_size)
+                                 PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindDeclaredDirectMethod(const StringPiece& name, const StringPiece& signature,
-                                      size_t pointer_size)
+                                      PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindDeclaredDirectMethod(const StringPiece& name, const Signature& signature,
-                                      size_t pointer_size)
+                                      PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindDeclaredDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx,
-                                      size_t pointer_size)
+                                      PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindDirectMethod(const StringPiece& name, const StringPiece& signature,
-                              size_t pointer_size)
+                              PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindDirectMethod(const StringPiece& name, const Signature& signature,
-                              size_t pointer_size)
+                              PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx,
-                              size_t pointer_size)
+                              PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindDeclaredVirtualMethod(const StringPiece& name, const StringPiece& signature,
-                                       size_t pointer_size)
+                                       PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindDeclaredVirtualMethod(const StringPiece& name, const Signature& signature,
-                                       size_t pointer_size)
+                                       PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindDeclaredVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx,
-                                       size_t pointer_size)
+                                       PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ArtMethod* FindDeclaredVirtualMethodByName(const StringPiece& name, size_t pointer_size)
+  ArtMethod* FindDeclaredVirtualMethodByName(const StringPiece& name, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ArtMethod* FindDeclaredDirectMethodByName(const StringPiece& name, size_t pointer_size)
+  ArtMethod* FindDeclaredDirectMethodByName(const StringPiece& name, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindVirtualMethod(const StringPiece& name, const StringPiece& signature,
-                               size_t pointer_size)
+                               PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindVirtualMethod(const StringPiece& name, const Signature& signature,
-                               size_t pointer_size)
+                               PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   ArtMethod* FindVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx,
-                               size_t pointer_size)
+                               PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ArtMethod* FindClassInitializer(size_t pointer_size) SHARED_REQUIRES(Locks::mutator_lock_);
+  ArtMethod* FindClassInitializer(PointerSize pointer_size) SHARED_REQUIRES(Locks::mutator_lock_);
 
   bool HasDefaultMethods() SHARED_REQUIRES(Locks::mutator_lock_) {
     return (GetAccessFlags() & kAccHasDefaultMethod) != 0;
@@ -1040,11 +1045,11 @@
   // Get the offset of the first reference static field. Other reference static fields follow.
   template <VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags,
             ReadBarrierOption kReadBarrierOption = kWithReadBarrier>
-  MemberOffset GetFirstReferenceStaticFieldOffset(size_t pointer_size)
+  MemberOffset GetFirstReferenceStaticFieldOffset(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Get the offset of the first reference static field. Other reference static fields follow.
-  MemberOffset GetFirstReferenceStaticFieldOffsetDuringLinking(size_t pointer_size)
+  MemberOffset GetFirstReferenceStaticFieldOffsetDuringLinking(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Gets the static fields of the class.
@@ -1154,11 +1159,11 @@
   // Visit native roots visits roots which are keyed off the native pointers such as ArtFields and
   // ArtMethods.
   template<ReadBarrierOption kReadBarrierOption = kWithReadBarrier, class Visitor>
-  void VisitNativeRoots(Visitor& visitor, size_t pointer_size)
+  void VisitNativeRoots(Visitor& visitor, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // When class is verified, set the kAccSkipAccessChecks flag on each method.
-  void SetSkipAccessChecksFlagOnAllMethods(size_t pointer_size)
+  void SetSkipAccessChecksFlagOnAllMethods(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Get the descriptor of the class. In a few cases a std::string is required, rather than
@@ -1193,7 +1198,7 @@
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   Class* CopyOf(Thread* self, int32_t new_length, ImTable* imt,
-                size_t pointer_size)
+                PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_);
 
   // For proxy class only.
@@ -1217,7 +1222,7 @@
 
   // May cause thread suspension due to EqualParameters.
   ArtMethod* GetDeclaredConstructor(
-      Thread* self, Handle<mirror::ObjectArray<mirror::Class>> args, size_t pointer_size)
+      Thread* self, Handle<mirror::ObjectArray<mirror::Class>> args, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   static int32_t GetInnerClassFlags(Handle<Class> h_this, int32_t default_value)
@@ -1244,27 +1249,28 @@
     return GetClassLoader() == nullptr;
   }
 
-  static size_t ImTableEntrySize(size_t pointer_size) {
-    return pointer_size;
+  static size_t ImTableEntrySize(PointerSize pointer_size) {
+    return static_cast<size_t>(pointer_size);
   }
 
-  static size_t VTableEntrySize(size_t pointer_size) {
-    return pointer_size;
+  static size_t VTableEntrySize(PointerSize pointer_size) {
+    return static_cast<size_t>(pointer_size);
   }
 
-  ALWAYS_INLINE ArraySlice<ArtMethod> GetDirectMethodsSliceUnchecked(size_t pointer_size)
+  ALWAYS_INLINE ArraySlice<ArtMethod> GetDirectMethodsSliceUnchecked(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ALWAYS_INLINE ArraySlice<ArtMethod> GetVirtualMethodsSliceUnchecked(size_t pointer_size)
+  ALWAYS_INLINE ArraySlice<ArtMethod> GetVirtualMethodsSliceUnchecked(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredMethodsSliceUnchecked(size_t pointer_size)
+  ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredMethodsSliceUnchecked(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredVirtualMethodsSliceUnchecked(size_t pointer_size)
+  ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredVirtualMethodsSliceUnchecked(
+      PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ALWAYS_INLINE ArraySlice<ArtMethod> GetCopiedMethodsSliceUnchecked(size_t pointer_size)
+  ALWAYS_INLINE ArraySlice<ArtMethod> GetCopiedMethodsSliceUnchecked(PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Fix up all of the native pointers in the class by running them through the visitor. Only sets
@@ -1274,7 +1280,7 @@
   template <VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags,
             ReadBarrierOption kReadBarrierOption = kWithReadBarrier,
             typename Visitor>
-  void FixupNativePointers(mirror::Class* dest, size_t pointer_size, const Visitor& visitor)
+  void FixupNativePointers(mirror::Class* dest, PointerSize pointer_size, const Visitor& visitor)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
  private:
@@ -1318,8 +1324,9 @@
   bool ProxyDescriptorEquals(const char* match) SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Check that the pointer size matches the one in the class linker.
-  ALWAYS_INLINE static void CheckPointerSize(size_t pointer_size);
-  static MemberOffset EmbeddedVTableOffset(size_t pointer_size);
+  ALWAYS_INLINE static void CheckPointerSize(PointerSize pointer_size);
+
+  static MemberOffset EmbeddedVTableOffset(PointerSize pointer_size);
   template <bool kVisitNativeRoots,
             VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags,
             ReadBarrierOption kReadBarrierOption = kWithReadBarrier,
diff --git a/runtime/mirror/dex_cache-inl.h b/runtime/mirror/dex_cache-inl.h
index 0b3461f..84469ea 100644
--- a/runtime/mirror/dex_cache-inl.h
+++ b/runtime/mirror/dex_cache-inl.h
@@ -22,6 +22,7 @@
 #include "art_field-inl.h"
 #include "art_method-inl.h"
 #include "base/casts.h"
+#include "base/enums.h"
 #include "base/logging.h"
 #include "mirror/class.h"
 #include "runtime.h"
@@ -29,7 +30,7 @@
 namespace art {
 namespace mirror {
 
-inline uint32_t DexCache::ClassSize(size_t pointer_size) {
+inline uint32_t DexCache::ClassSize(PointerSize pointer_size) {
   uint32_t vtable_entries = Object::kVTableLength + 5;
   return Class::ComputeClassSize(true, vtable_entries, 0, 0, 0, 0, 0, pointer_size);
 }
@@ -60,7 +61,7 @@
   Runtime::Current()->GetHeap()->WriteBarrierEveryFieldOf(this);
 }
 
-inline ArtField* DexCache::GetResolvedField(uint32_t field_idx, size_t ptr_size) {
+inline ArtField* DexCache::GetResolvedField(uint32_t field_idx, PointerSize ptr_size) {
   DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), ptr_size);
   DCHECK_LT(field_idx, NumResolvedFields());  // NOTE: Unchecked, i.e. not throwing AIOOB.
   ArtField* field = GetElementPtrSize(GetResolvedFields(), field_idx, ptr_size);
@@ -70,13 +71,13 @@
   return field;
 }
 
-inline void DexCache::SetResolvedField(uint32_t field_idx, ArtField* field, size_t ptr_size) {
+inline void DexCache::SetResolvedField(uint32_t field_idx, ArtField* field, PointerSize ptr_size) {
   DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), ptr_size);
   DCHECK_LT(field_idx, NumResolvedFields());  // NOTE: Unchecked, i.e. not throwing AIOOB.
   SetElementPtrSize(GetResolvedFields(), field_idx, field, ptr_size);
 }
 
-inline ArtMethod* DexCache::GetResolvedMethod(uint32_t method_idx, size_t ptr_size) {
+inline ArtMethod* DexCache::GetResolvedMethod(uint32_t method_idx, PointerSize ptr_size) {
   DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), ptr_size);
   DCHECK_LT(method_idx, NumResolvedMethods());  // NOTE: Unchecked, i.e. not throwing AIOOB.
   ArtMethod* method = GetElementPtrSize<ArtMethod*>(GetResolvedMethods(), method_idx, ptr_size);
@@ -88,19 +89,20 @@
   return method;
 }
 
-inline void DexCache::SetResolvedMethod(uint32_t method_idx, ArtMethod* method, size_t ptr_size) {
+inline void DexCache::SetResolvedMethod(uint32_t method_idx,
+                                        ArtMethod* method,
+                                        PointerSize ptr_size) {
   DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), ptr_size);
   DCHECK_LT(method_idx, NumResolvedMethods());  // NOTE: Unchecked, i.e. not throwing AIOOB.
   SetElementPtrSize(GetResolvedMethods(), method_idx, method, ptr_size);
 }
 
 template <typename PtrType>
-inline PtrType DexCache::GetElementPtrSize(PtrType* ptr_array, size_t idx, size_t ptr_size) {
-  if (ptr_size == 8u) {
+inline PtrType DexCache::GetElementPtrSize(PtrType* ptr_array, size_t idx, PointerSize ptr_size) {
+  if (ptr_size == PointerSize::k64) {
     uint64_t element = reinterpret_cast<const uint64_t*>(ptr_array)[idx];
     return reinterpret_cast<PtrType>(dchecked_integral_cast<uintptr_t>(element));
   } else {
-    DCHECK_EQ(ptr_size, 4u);
     uint32_t element = reinterpret_cast<const uint32_t*>(ptr_array)[idx];
     return reinterpret_cast<PtrType>(dchecked_integral_cast<uintptr_t>(element));
   }
@@ -110,12 +112,11 @@
 inline void DexCache::SetElementPtrSize(PtrType* ptr_array,
                                         size_t idx,
                                         PtrType ptr,
-                                        size_t ptr_size) {
-  if (ptr_size == 8u) {
+                                        PointerSize ptr_size) {
+  if (ptr_size == PointerSize::k64) {
     reinterpret_cast<uint64_t*>(ptr_array)[idx] =
         dchecked_integral_cast<uint64_t>(reinterpret_cast<uintptr_t>(ptr));
   } else {
-    DCHECK_EQ(ptr_size, 4u);
     reinterpret_cast<uint32_t*>(ptr_array)[idx] =
         dchecked_integral_cast<uint32_t>(reinterpret_cast<uintptr_t>(ptr));
   }
diff --git a/runtime/mirror/dex_cache.cc b/runtime/mirror/dex_cache.cc
index 692c6cb..57066d8 100644
--- a/runtime/mirror/dex_cache.cc
+++ b/runtime/mirror/dex_cache.cc
@@ -41,7 +41,7 @@
                     uint32_t num_resolved_methods,
                     ArtField** resolved_fields,
                     uint32_t num_resolved_fields,
-                    size_t pointer_size) {
+                    PointerSize pointer_size) {
   CHECK(dex_file != nullptr);
   CHECK(location != nullptr);
   CHECK_EQ(num_strings != 0u, strings != nullptr);
@@ -67,7 +67,7 @@
   }
 }
 
-void DexCache::Fixup(ArtMethod* trampoline, size_t pointer_size) {
+void DexCache::Fixup(ArtMethod* trampoline, PointerSize pointer_size) {
   // Fixup the resolve methods array to contain trampoline for resolution.
   CHECK(trampoline != nullptr);
   CHECK(trampoline->IsRuntimeMethod());
diff --git a/runtime/mirror/dex_cache.h b/runtime/mirror/dex_cache.h
index 7912510..d02a0d8 100644
--- a/runtime/mirror/dex_cache.h
+++ b/runtime/mirror/dex_cache.h
@@ -39,7 +39,7 @@
 class MANAGED DexCache FINAL : public Object {
  public:
   // Size of java.lang.DexCache.class.
-  static uint32_t ClassSize(size_t pointer_size);
+  static uint32_t ClassSize(PointerSize pointer_size);
 
   // Size of an instance of java.lang.DexCache not including referenced values.
   static constexpr uint32_t InstanceSize() {
@@ -56,9 +56,9 @@
             uint32_t num_resolved_methods,
             ArtField** resolved_fields,
             uint32_t num_resolved_fields,
-            size_t pointer_size) SHARED_REQUIRES(Locks::mutator_lock_);
+            PointerSize pointer_size) SHARED_REQUIRES(Locks::mutator_lock_);
 
-  void Fixup(ArtMethod* trampoline, size_t pointer_size)
+  void Fixup(ArtMethod* trampoline, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   template <ReadBarrierOption kReadBarrierOption = kWithReadBarrier, typename Visitor>
@@ -119,18 +119,20 @@
 
   void SetResolvedType(uint32_t type_idx, Class* resolved) SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ALWAYS_INLINE ArtMethod* GetResolvedMethod(uint32_t method_idx, size_t ptr_size)
+  ALWAYS_INLINE ArtMethod* GetResolvedMethod(uint32_t method_idx, PointerSize ptr_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  ALWAYS_INLINE void SetResolvedMethod(uint32_t method_idx, ArtMethod* resolved, size_t ptr_size)
+  ALWAYS_INLINE void SetResolvedMethod(uint32_t method_idx,
+                                       ArtMethod* resolved,
+                                       PointerSize ptr_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Pointer sized variant, used for patching.
-  ALWAYS_INLINE ArtField* GetResolvedField(uint32_t idx, size_t ptr_size)
+  ALWAYS_INLINE ArtField* GetResolvedField(uint32_t idx, PointerSize ptr_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Pointer sized variant, used for patching.
-  ALWAYS_INLINE void SetResolvedField(uint32_t idx, ArtField* field, size_t ptr_size)
+  ALWAYS_INLINE void SetResolvedField(uint32_t idx, ArtField* field, PointerSize ptr_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   GcRoot<String>* GetStrings() ALWAYS_INLINE SHARED_REQUIRES(Locks::mutator_lock_) {
@@ -202,10 +204,10 @@
   // so they need to be public.
 
   template <typename PtrType>
-  static PtrType GetElementPtrSize(PtrType* ptr_array, size_t idx, size_t ptr_size);
+  static PtrType GetElementPtrSize(PtrType* ptr_array, size_t idx, PointerSize ptr_size);
 
   template <typename PtrType>
-  static void SetElementPtrSize(PtrType* ptr_array, size_t idx, PtrType ptr, size_t ptr_size);
+  static void SetElementPtrSize(PtrType* ptr_array, size_t idx, PtrType ptr, PointerSize ptr_size);
 
  private:
   // Visit instance fields of the dex cache as well as its associated arrays.
diff --git a/runtime/mirror/field-inl.h b/runtime/mirror/field-inl.h
index 4183476..8b0f8ce 100644
--- a/runtime/mirror/field-inl.h
+++ b/runtime/mirror/field-inl.h
@@ -27,9 +27,8 @@
 
 namespace mirror {
 
-template <size_t kPointerSize, bool kTransactionActive>
-inline mirror::Field* Field::CreateFromArtField(Thread* self, ArtField* field,
-                                                bool force_resolve) {
+template <PointerSize kPointerSize, bool kTransactionActive>
+inline mirror::Field* Field::CreateFromArtField(Thread* self, ArtField* field, bool force_resolve) {
   StackHandleScope<2> hs(self);
   // Try to resolve type before allocating since this is a thread suspension point.
   Handle<mirror::Class> type = hs.NewHandle(field->GetType<true>());
diff --git a/runtime/mirror/field.cc b/runtime/mirror/field.cc
index ff6847c..65f6b16 100644
--- a/runtime/mirror/field.cc
+++ b/runtime/mirror/field.cc
@@ -68,7 +68,7 @@
     }
   }
   mirror::DexCache* const dex_cache = declaring_class->GetDexCache();
-  ArtField* const art_field = dex_cache->GetResolvedField(GetDexFieldIndex(), sizeof(void*));
+  ArtField* const art_field = dex_cache->GetResolvedField(GetDexFieldIndex(), kRuntimePointerSize);
   CHECK(art_field != nullptr);
   CHECK_EQ(declaring_class, art_field->GetDeclaringClass());
   return art_field;
diff --git a/runtime/mirror/field.h b/runtime/mirror/field.h
index 2bd6132..93fd7f1 100644
--- a/runtime/mirror/field.h
+++ b/runtime/mirror/field.h
@@ -18,6 +18,7 @@
 #define ART_RUNTIME_MIRROR_FIELD_H_
 
 #include "accessible_object.h"
+#include "base/enums.h"
 #include "gc_root.h"
 #include "object.h"
 #include "object_callbacks.h"
@@ -92,7 +93,7 @@
   // Slow, try to use only for PrettyField and such.
   ArtField* GetArtField() SHARED_REQUIRES(Locks::mutator_lock_);
 
-  template <size_t kPointerSize, bool kTransactionActive = false>
+  template <PointerSize kPointerSize, bool kTransactionActive = false>
   static mirror::Field* CreateFromArtField(Thread* self, ArtField* field,
                                            bool force_resolve)
       SHARED_REQUIRES(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_);
diff --git a/runtime/mirror/method.cc b/runtime/mirror/method.cc
index 3cc70e1..ef16719 100644
--- a/runtime/mirror/method.cc
+++ b/runtime/mirror/method.cc
@@ -51,7 +51,7 @@
   array_class_ = GcRoot<Class>(nullptr);
 }
 
-template <size_t kPointerSize, bool kTransactionActive>
+template <PointerSize kPointerSize, bool kTransactionActive>
 Method* Method::CreateFromArtMethod(Thread* self, ArtMethod* method) {
   DCHECK(!method->IsConstructor()) << PrettyMethod(method);
   auto* ret = down_cast<Method*>(StaticClass()->AllocObject(self));
@@ -62,10 +62,14 @@
   return ret;
 }
 
-template Method* Method::CreateFromArtMethod<4U, false>(Thread* self, ArtMethod* method);
-template Method* Method::CreateFromArtMethod<4U, true>(Thread* self, ArtMethod* method);
-template Method* Method::CreateFromArtMethod<8U, false>(Thread* self, ArtMethod* method);
-template Method* Method::CreateFromArtMethod<8U, true>(Thread* self, ArtMethod* method);
+template Method* Method::CreateFromArtMethod<PointerSize::k32, false>(Thread* self,
+                                                                      ArtMethod* method);
+template Method* Method::CreateFromArtMethod<PointerSize::k32, true>(Thread* self,
+                                                                     ArtMethod* method);
+template Method* Method::CreateFromArtMethod<PointerSize::k64, false>(Thread* self,
+                                                                      ArtMethod* method);
+template Method* Method::CreateFromArtMethod<PointerSize::k64, true>(Thread* self,
+                                                                     ArtMethod* method);
 
 void Method::VisitRoots(RootVisitor* visitor) {
   static_class_.VisitRootIfNonNull(visitor, RootInfo(kRootStickyClass));
@@ -99,7 +103,7 @@
   array_class_.VisitRootIfNonNull(visitor, RootInfo(kRootStickyClass));
 }
 
-template <size_t kPointerSize, bool kTransactionActive>
+template <PointerSize kPointerSize, bool kTransactionActive>
 Constructor* Constructor::CreateFromArtMethod(Thread* self, ArtMethod* method) {
   DCHECK(method->IsConstructor()) << PrettyMethod(method);
   auto* ret = down_cast<Constructor*>(StaticClass()->AllocObject(self));
@@ -110,10 +114,14 @@
   return ret;
 }
 
-template Constructor* Constructor::CreateFromArtMethod<4U, false>(Thread* self, ArtMethod* method);
-template Constructor* Constructor::CreateFromArtMethod<4U, true>(Thread* self, ArtMethod* method);
-template Constructor* Constructor::CreateFromArtMethod<8U, false>(Thread* self, ArtMethod* method);
-template Constructor* Constructor::CreateFromArtMethod<8U, true>(Thread* self, ArtMethod* method);
+template Constructor* Constructor::CreateFromArtMethod<PointerSize::k32, false>(
+    Thread* self, ArtMethod* method);
+template Constructor* Constructor::CreateFromArtMethod<PointerSize::k32, true>(
+    Thread* self, ArtMethod* method);
+template Constructor* Constructor::CreateFromArtMethod<PointerSize::k64, false>(
+    Thread* self, ArtMethod* method);
+template Constructor* Constructor::CreateFromArtMethod<PointerSize::k64, true>(
+    Thread* self, ArtMethod* method);
 
 }  // namespace mirror
 }  // namespace art
diff --git a/runtime/mirror/method.h b/runtime/mirror/method.h
index ecd6a74..be51784 100644
--- a/runtime/mirror/method.h
+++ b/runtime/mirror/method.h
@@ -28,7 +28,7 @@
 // C++ mirror of java.lang.reflect.Method.
 class MANAGED Method : public AbstractMethod {
  public:
-  template <size_t kPointerSize, bool kTransactionActive>
+  template <PointerSize kPointerSize, bool kTransactionActive>
   static Method* CreateFromArtMethod(Thread* self, ArtMethod* method)
       SHARED_REQUIRES(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_);
 
@@ -60,7 +60,7 @@
 // C++ mirror of java.lang.reflect.Constructor.
 class MANAGED Constructor: public AbstractMethod {
  public:
-  template <size_t kPointerSize, bool kTransactionActive>
+  template <PointerSize kPointerSize, bool kTransactionActive>
   static Constructor* CreateFromArtMethod(Thread* self, ArtMethod* method)
       SHARED_REQUIRES(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_);
 
diff --git a/runtime/mirror/object-inl.h b/runtime/mirror/object-inl.h
index e1097fa..0592c6c 100644
--- a/runtime/mirror/object-inl.h
+++ b/runtime/mirror/object-inl.h
@@ -40,7 +40,7 @@
 namespace art {
 namespace mirror {
 
-inline uint32_t Object::ClassSize(size_t pointer_size) {
+inline uint32_t Object::ClassSize(PointerSize pointer_size) {
   uint32_t vtable_entries = kVTableLength;
   return Class::ComputeClassSize(true, vtable_entries, 0, 0, 0, 0, 0, pointer_size);
 }
diff --git a/runtime/mirror/object.h b/runtime/mirror/object.h
index e174cbc..a4bdbad 100644
--- a/runtime/mirror/object.h
+++ b/runtime/mirror/object.h
@@ -18,6 +18,7 @@
 #define ART_RUNTIME_MIRROR_OBJECT_H_
 
 #include "base/casts.h"
+#include "base/enums.h"
 #include "globals.h"
 #include "object_reference.h"
 #include "offsets.h"
@@ -74,7 +75,7 @@
   static constexpr size_t kVTableLength = 11;
 
   // The size of the java.lang.Class representing a java.lang.Object.
-  static uint32_t ClassSize(size_t pointer_size);
+  static uint32_t ClassSize(PointerSize pointer_size);
 
   // Size of an instance of java.lang.Object.
   static constexpr uint32_t InstanceSize() {
@@ -473,7 +474,7 @@
   void SetFieldPtr(MemberOffset field_offset, T new_value)
       SHARED_REQUIRES(Locks::mutator_lock_) {
     SetFieldPtrWithSize<kTransactionActive, kCheckTransaction, kVerifyFlags>(
-        field_offset, new_value, sizeof(void*));
+        field_offset, new_value, kRuntimePointerSize);
   }
   template<bool kTransactionActive, bool kCheckTransaction = true,
       VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, typename T>
@@ -485,11 +486,11 @@
 
   template<bool kTransactionActive, bool kCheckTransaction = true,
       VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, typename T>
-  ALWAYS_INLINE void SetFieldPtrWithSize(MemberOffset field_offset, T new_value,
-                                         size_t pointer_size)
+  ALWAYS_INLINE void SetFieldPtrWithSize(MemberOffset field_offset,
+                                         T new_value,
+                                         PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_) {
-    DCHECK(pointer_size == 4 || pointer_size == 8) << pointer_size;
-    if (pointer_size == 4) {
+    if (pointer_size == PointerSize::k32) {
       intptr_t ptr  = reinterpret_cast<intptr_t>(new_value);
       DCHECK_EQ(static_cast<int32_t>(ptr), ptr);  // Check that we dont lose any non 0 bits.
       SetField32<kTransactionActive, kCheckTransaction, kVerifyFlags>(
@@ -521,19 +522,19 @@
   template<class T, VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, bool kIsVolatile = false>
   T GetFieldPtr(MemberOffset field_offset)
       SHARED_REQUIRES(Locks::mutator_lock_) {
-    return GetFieldPtrWithSize<T, kVerifyFlags, kIsVolatile>(field_offset, sizeof(void*));
+    return GetFieldPtrWithSize<T, kVerifyFlags, kIsVolatile>(field_offset, kRuntimePointerSize);
   }
   template<class T, VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, bool kIsVolatile = false>
   T GetFieldPtr64(MemberOffset field_offset)
       SHARED_REQUIRES(Locks::mutator_lock_) {
-    return GetFieldPtrWithSize<T, kVerifyFlags, kIsVolatile>(field_offset, 8u);
+    return GetFieldPtrWithSize<T, kVerifyFlags, kIsVolatile>(field_offset,
+                                                             PointerSize::k64);
   }
 
   template<class T, VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, bool kIsVolatile = false>
-  ALWAYS_INLINE T GetFieldPtrWithSize(MemberOffset field_offset, size_t pointer_size)
+  ALWAYS_INLINE T GetFieldPtrWithSize(MemberOffset field_offset, PointerSize pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_) {
-    DCHECK(pointer_size == 4 || pointer_size == 8) << pointer_size;
-    if (pointer_size == 4) {
+    if (pointer_size == PointerSize::k32) {
       return reinterpret_cast<T>(GetField32<kVerifyFlags, kIsVolatile>(field_offset));
     } else {
       int64_t v = GetField64<kVerifyFlags, kIsVolatile>(field_offset);
diff --git a/runtime/mirror/object_array.h b/runtime/mirror/object_array.h
index 4257396..a99d616 100644
--- a/runtime/mirror/object_array.h
+++ b/runtime/mirror/object_array.h
@@ -26,7 +26,7 @@
 class MANAGED ObjectArray: public Array {
  public:
   // The size of Object[].class.
-  static uint32_t ClassSize(size_t pointer_size) {
+  static uint32_t ClassSize(PointerSize pointer_size) {
     return Array::ClassSize(pointer_size);
   }
 
diff --git a/runtime/mirror/object_test.cc b/runtime/mirror/object_test.cc
index c1284a6..0034220 100644
--- a/runtime/mirror/object_test.cc
+++ b/runtime/mirror/object_test.cc
@@ -24,6 +24,7 @@
 #include "art_field-inl.h"
 #include "art_method-inl.h"
 #include "asm_support.h"
+#include "base/enums.h"
 #include "class-inl.h"
 #include "class_linker.h"
 #include "class_linker-inl.h"
@@ -78,9 +79,11 @@
   EXPECT_EQ(kObjectReferenceSize, sizeof(HeapReference<Object>));
   EXPECT_EQ(kObjectHeaderSize, sizeof(Object));
   EXPECT_EQ(ART_METHOD_QUICK_CODE_OFFSET_32,
-            ArtMethod::EntryPointFromQuickCompiledCodeOffset(4).Int32Value());
+            ArtMethod::EntryPointFromQuickCompiledCodeOffset(PointerSize::k32).
+                Int32Value());
   EXPECT_EQ(ART_METHOD_QUICK_CODE_OFFSET_64,
-            ArtMethod::EntryPointFromQuickCompiledCodeOffset(8).Int32Value());
+            ArtMethod::EntryPointFromQuickCompiledCodeOffset(PointerSize::k64).
+                Int32Value());
 }
 
 TEST_F(ObjectTest, IsInSamePackage) {
@@ -306,7 +309,7 @@
   // pretend we are trying to call 'new char[3]' from String.toCharArray
   ScopedObjectAccess soa(Thread::Current());
   Class* java_util_Arrays = class_linker_->FindSystemClass(soa.Self(), "Ljava/util/Arrays;");
-  ArtMethod* sort = java_util_Arrays->FindDirectMethod("sort", "([I)V", sizeof(void*));
+  ArtMethod* sort = java_util_Arrays->FindDirectMethod("sort", "([I)V", kRuntimePointerSize);
   const DexFile::TypeId* type_id = java_lang_dex_file_->FindTypeId("[I");
   ASSERT_TRUE(type_id != nullptr);
   uint32_t type_idx = java_lang_dex_file_->GetIndexForTypeId(*type_id);
@@ -363,7 +366,7 @@
   StackHandleScope<2> hs(soa.Self());
   Handle<mirror::ClassLoader> loader(hs.NewHandle(soa.Decode<ClassLoader*>(class_loader)));
   Class* klass = class_linker_->FindClass(soa.Self(), "LStaticsFromCode;", loader);
-  ArtMethod* clinit = klass->FindClassInitializer(sizeof(void*));
+  ArtMethod* clinit = klass->FindClassInitializer(kRuntimePointerSize);
   const DexFile::TypeId* klass_type_id = dex_file->FindTypeId("LStaticsFromCode;");
   ASSERT_TRUE(klass_type_id != nullptr);
 
@@ -499,22 +502,22 @@
   Class* klass2 = linker->FindClass(soa.Self(), "LProtoCompare2;", class_loader_2);
   ASSERT_TRUE(klass2 != nullptr);
 
-  ArtMethod* m1_1 = klass1->GetVirtualMethod(0, sizeof(void*));
+  ArtMethod* m1_1 = klass1->GetVirtualMethod(0, kRuntimePointerSize);
   EXPECT_STREQ(m1_1->GetName(), "m1");
-  ArtMethod* m2_1 = klass1->GetVirtualMethod(1, sizeof(void*));
+  ArtMethod* m2_1 = klass1->GetVirtualMethod(1, kRuntimePointerSize);
   EXPECT_STREQ(m2_1->GetName(), "m2");
-  ArtMethod* m3_1 = klass1->GetVirtualMethod(2, sizeof(void*));
+  ArtMethod* m3_1 = klass1->GetVirtualMethod(2, kRuntimePointerSize);
   EXPECT_STREQ(m3_1->GetName(), "m3");
-  ArtMethod* m4_1 = klass1->GetVirtualMethod(3, sizeof(void*));
+  ArtMethod* m4_1 = klass1->GetVirtualMethod(3, kRuntimePointerSize);
   EXPECT_STREQ(m4_1->GetName(), "m4");
 
-  ArtMethod* m1_2 = klass2->GetVirtualMethod(0, sizeof(void*));
+  ArtMethod* m1_2 = klass2->GetVirtualMethod(0, kRuntimePointerSize);
   EXPECT_STREQ(m1_2->GetName(), "m1");
-  ArtMethod* m2_2 = klass2->GetVirtualMethod(1, sizeof(void*));
+  ArtMethod* m2_2 = klass2->GetVirtualMethod(1, kRuntimePointerSize);
   EXPECT_STREQ(m2_2->GetName(), "m2");
-  ArtMethod* m3_2 = klass2->GetVirtualMethod(2, sizeof(void*));
+  ArtMethod* m3_2 = klass2->GetVirtualMethod(2, kRuntimePointerSize);
   EXPECT_STREQ(m3_2->GetName(), "m3");
-  ArtMethod* m4_2 = klass2->GetVirtualMethod(3, sizeof(void*));
+  ArtMethod* m4_2 = klass2->GetVirtualMethod(3, kRuntimePointerSize);
   EXPECT_STREQ(m4_2->GetName(), "m4");
 }
 
diff --git a/runtime/mirror/reference-inl.h b/runtime/mirror/reference-inl.h
index 12bfe38..039989b 100644
--- a/runtime/mirror/reference-inl.h
+++ b/runtime/mirror/reference-inl.h
@@ -22,7 +22,7 @@
 namespace art {
 namespace mirror {
 
-inline uint32_t Reference::ClassSize(size_t pointer_size) {
+inline uint32_t Reference::ClassSize(PointerSize pointer_size) {
   uint32_t vtable_entries = Object::kVTableLength + 4;
   return Class::ComputeClassSize(false, vtable_entries, 2, 0, 0, 0, 0, pointer_size);
 }
diff --git a/runtime/mirror/reference.h b/runtime/mirror/reference.h
index e8ad5fa..38c6616 100644
--- a/runtime/mirror/reference.h
+++ b/runtime/mirror/reference.h
@@ -17,6 +17,7 @@
 #ifndef ART_RUNTIME_MIRROR_REFERENCE_H_
 #define ART_RUNTIME_MIRROR_REFERENCE_H_
 
+#include "base/enums.h"
 #include "class.h"
 #include "gc_root.h"
 #include "object.h"
@@ -43,7 +44,7 @@
 class MANAGED Reference : public Object {
  public:
   // Size of java.lang.ref.Reference.class.
-  static uint32_t ClassSize(size_t pointer_size);
+  static uint32_t ClassSize(PointerSize pointer_size);
 
   // Size of an instance of java.lang.ref.Reference.
   static constexpr uint32_t InstanceSize() {
diff --git a/runtime/mirror/string-inl.h b/runtime/mirror/string-inl.h
index 96f2098..d3660e5 100644
--- a/runtime/mirror/string-inl.h
+++ b/runtime/mirror/string-inl.h
@@ -33,7 +33,7 @@
 namespace art {
 namespace mirror {
 
-inline uint32_t String::ClassSize(size_t pointer_size) {
+inline uint32_t String::ClassSize(PointerSize pointer_size) {
   uint32_t vtable_entries = Object::kVTableLength + 57;
   return Class::ComputeClassSize(true, vtable_entries, 0, 0, 0, 1, 2, pointer_size);
 }
diff --git a/runtime/mirror/string.h b/runtime/mirror/string.h
index e2cfb8d..d492ba3 100644
--- a/runtime/mirror/string.h
+++ b/runtime/mirror/string.h
@@ -35,7 +35,7 @@
 class MANAGED String FINAL : public Object {
  public:
   // Size of java.lang.String.class.
-  static uint32_t ClassSize(size_t pointer_size);
+  static uint32_t ClassSize(PointerSize pointer_size);
 
   // Size of an instance of java.lang.String not including its value array.
   static constexpr uint32_t InstanceSize() {
diff --git a/runtime/mirror/throwable.cc b/runtime/mirror/throwable.cc
index f068b3e..0bccc8b 100644
--- a/runtime/mirror/throwable.cc
+++ b/runtime/mirror/throwable.cc
@@ -17,6 +17,7 @@
 #include "throwable.h"
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "class-inl.h"
 #include "dex_file-inl.h"
 #include "gc/accounting/card_table-inl.h"
@@ -106,7 +107,7 @@
     if (depth == 0) {
       result += "(Throwable with empty stack trace)";
     } else {
-      const size_t ptr_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+      const PointerSize ptr_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
       for (int32_t i = 0; i < depth; ++i) {
         ArtMethod* method = method_trace->GetElementPtrSize<ArtMethod*>(i, ptr_size);
         uintptr_t dex_pc = method_trace->GetElementPtrSize<uintptr_t>(i + depth, ptr_size);
diff --git a/runtime/native/dalvik_system_VMRuntime.cc b/runtime/native/dalvik_system_VMRuntime.cc
index d987f65..45e49e2 100644
--- a/runtime/native/dalvik_system_VMRuntime.cc
+++ b/runtime/native/dalvik_system_VMRuntime.cc
@@ -29,6 +29,7 @@
 
 #include "art_method-inl.h"
 #include "arch/instruction_set.h"
+#include "base/enums.h"
 #include "class_linker-inl.h"
 #include "common_throws.h"
 #include "debugger.h"
@@ -329,7 +330,7 @@
 static void PreloadDexCachesResolveField(Handle<mirror::DexCache> dex_cache, uint32_t field_idx,
                                          bool is_static)
     SHARED_REQUIRES(Locks::mutator_lock_) {
-  ArtField* field = dex_cache->GetResolvedField(field_idx, sizeof(void*));
+  ArtField* field = dex_cache->GetResolvedField(field_idx, kRuntimePointerSize);
   if (field != nullptr) {
     return;
   }
@@ -350,14 +351,14 @@
     return;
   }
   // LOG(INFO) << "VMRuntime.preloadDexCaches resolved field " << PrettyField(field);
-  dex_cache->SetResolvedField(field_idx, field, sizeof(void*));
+  dex_cache->SetResolvedField(field_idx, field, kRuntimePointerSize);
 }
 
 // Based on ClassLinker::ResolveMethod.
 static void PreloadDexCachesResolveMethod(Handle<mirror::DexCache> dex_cache, uint32_t method_idx,
                                           InvokeType invoke_type)
     SHARED_REQUIRES(Locks::mutator_lock_) {
-  ArtMethod* method = dex_cache->GetResolvedMethod(method_idx, sizeof(void*));
+  ArtMethod* method = dex_cache->GetResolvedMethod(method_idx, kRuntimePointerSize);
   if (method != nullptr) {
     return;
   }
@@ -370,14 +371,14 @@
   switch (invoke_type) {
     case kDirect:
     case kStatic:
-      method = klass->FindDirectMethod(dex_cache.Get(), method_idx, sizeof(void*));
+      method = klass->FindDirectMethod(dex_cache.Get(), method_idx, kRuntimePointerSize);
       break;
     case kInterface:
-      method = klass->FindInterfaceMethod(dex_cache.Get(), method_idx, sizeof(void*));
+      method = klass->FindInterfaceMethod(dex_cache.Get(), method_idx, kRuntimePointerSize);
       break;
     case kSuper:
     case kVirtual:
-      method = klass->FindVirtualMethod(dex_cache.Get(), method_idx, sizeof(void*));
+      method = klass->FindVirtualMethod(dex_cache.Get(), method_idx, kRuntimePointerSize);
       break;
     default:
       LOG(FATAL) << "Unreachable - invocation type: " << invoke_type;
@@ -387,7 +388,7 @@
     return;
   }
   // LOG(INFO) << "VMRuntime.preloadDexCaches resolved method " << PrettyMethod(method);
-  dex_cache->SetResolvedMethod(method_idx, method, sizeof(void*));
+  dex_cache->SetResolvedMethod(method_idx, method, kRuntimePointerSize);
 }
 
 struct DexCacheStats {
@@ -462,7 +463,7 @@
       }
     }
     for (size_t j = 0; j < dex_cache->NumResolvedMethods(); j++) {
-      ArtMethod* method = dex_cache->GetResolvedMethod(j, sizeof(void*));
+      ArtMethod* method = dex_cache->GetResolvedMethod(j, kRuntimePointerSize);
       if (method != nullptr) {
         filled->num_methods++;
       }
diff --git a/runtime/native/java_lang_Class.cc b/runtime/native/java_lang_Class.cc
index 02a97f5..6d5e7c7 100644
--- a/runtime/native/java_lang_Class.cc
+++ b/runtime/native/java_lang_Class.cc
@@ -19,6 +19,7 @@
 #include <iostream>
 
 #include "art_field-inl.h"
+#include "base/enums.h"
 #include "class_linker.h"
 #include "common_throws.h"
 #include "dex_file-inl.h"
@@ -136,9 +137,9 @@
   }
   for (ArtField& field : ifields) {
     if (!public_only || field.IsPublic()) {
-      auto* reflect_field = mirror::Field::CreateFromArtField<sizeof(void*)>(self,
-                                                                             &field,
-                                                                             force_resolve);
+      auto* reflect_field = mirror::Field::CreateFromArtField<kRuntimePointerSize>(self,
+                                                                                   &field,
+                                                                                   force_resolve);
       if (reflect_field == nullptr) {
         if (kIsDebugBuild) {
           self->AssertPendingException();
@@ -151,9 +152,9 @@
   }
   for (ArtField& field : sfields) {
     if (!public_only || field.IsPublic()) {
-      auto* reflect_field = mirror::Field::CreateFromArtField<sizeof(void*)>(self,
-                                                                             &field,
-                                                                             force_resolve);
+      auto* reflect_field = mirror::Field::CreateFromArtField<kRuntimePointerSize>(self,
+                                                                                   &field,
+                                                                                   force_resolve);
       if (reflect_field == nullptr) {
         if (kIsDebugBuild) {
           self->AssertPendingException();
@@ -226,15 +227,11 @@
     SHARED_REQUIRES(Locks::mutator_lock_) {
   ArtField* art_field = FindFieldByName(self, name, c->GetIFieldsPtr());
   if (art_field != nullptr) {
-    return mirror::Field::CreateFromArtField<sizeof(void*)>(self,
-                                                            art_field,
-                                                            true);
+    return mirror::Field::CreateFromArtField<kRuntimePointerSize>(self, art_field, true);
   }
   art_field = FindFieldByName(self, name, c->GetSFieldsPtr());
   if (art_field != nullptr) {
-    return mirror::Field::CreateFromArtField<sizeof(void*)>(self,
-                                                            art_field,
-                                                            true);
+    return mirror::Field::CreateFromArtField<kRuntimePointerSize>(self, art_field, true);
   }
   return nullptr;
 }
@@ -331,9 +328,10 @@
 static jobject Class_getDeclaredConstructorInternal(
     JNIEnv* env, jobject javaThis, jobjectArray args) {
   ScopedFastNativeObjectAccess soa(env);
-  DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), sizeof(void*));
+  DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
   DCHECK(!Runtime::Current()->IsActiveTransaction());
-  mirror::Constructor* result = mirror::Class::GetDeclaredConstructorInternal<sizeof(void*), false>(
+  mirror::Constructor* result = mirror::Class::GetDeclaredConstructorInternal<kRuntimePointerSize,
+                                                                              false>(
       soa.Self(),
       DecodeClass(soa, javaThis),
       soa.Decode<mirror::ObjectArray<mirror::Class>*>(args));
@@ -353,7 +351,7 @@
   Handle<mirror::Class> h_klass = hs.NewHandle(DecodeClass(soa, javaThis));
   size_t constructor_count = 0;
   // Two pass approach for speed.
-  for (auto& m : h_klass->GetDirectMethods(sizeof(void*))) {
+  for (auto& m : h_klass->GetDirectMethods(kRuntimePointerSize)) {
     constructor_count += MethodMatchesConstructor(&m, publicOnly != JNI_FALSE) ? 1u : 0u;
   }
   auto h_constructors = hs.NewHandle(mirror::ObjectArray<mirror::Constructor>::Alloc(
@@ -363,11 +361,11 @@
     return nullptr;
   }
   constructor_count = 0;
-  for (auto& m : h_klass->GetDirectMethods(sizeof(void*))) {
+  for (auto& m : h_klass->GetDirectMethods(kRuntimePointerSize)) {
     if (MethodMatchesConstructor(&m, publicOnly != JNI_FALSE)) {
-      DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), sizeof(void*));
+      DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
       DCHECK(!Runtime::Current()->IsActiveTransaction());
-      auto* constructor = mirror::Constructor::CreateFromArtMethod<sizeof(void*), false>(
+      auto* constructor = mirror::Constructor::CreateFromArtMethod<kRuntimePointerSize, false>(
           soa.Self(), &m);
       if (UNLIKELY(constructor == nullptr)) {
         soa.Self()->AssertPendingOOMException();
@@ -382,9 +380,9 @@
 static jobject Class_getDeclaredMethodInternal(JNIEnv* env, jobject javaThis,
                                                jobject name, jobjectArray args) {
   ScopedFastNativeObjectAccess soa(env);
-  DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), sizeof(void*));
+  DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
   DCHECK(!Runtime::Current()->IsActiveTransaction());
-  mirror::Method* result = mirror::Class::GetDeclaredMethodInternal<sizeof(void*), false>(
+  mirror::Method* result = mirror::Class::GetDeclaredMethodInternal<kRuntimePointerSize, false>(
       soa.Self(),
       DecodeClass(soa, javaThis),
       soa.Decode<mirror::String*>(name),
@@ -398,7 +396,7 @@
   StackHandleScope<2> hs(soa.Self());
   Handle<mirror::Class> klass = hs.NewHandle(DecodeClass(soa, javaThis));
   size_t num_methods = 0;
-  for (auto& m : klass->GetDeclaredMethods(sizeof(void*))) {
+  for (auto& m : klass->GetDeclaredMethods(kRuntimePointerSize)) {
     auto modifiers = m.GetAccessFlags();
     // Add non-constructor declared methods.
     if ((publicOnly == JNI_FALSE || (modifiers & kAccPublic) != 0) &&
@@ -409,13 +407,14 @@
   auto ret = hs.NewHandle(mirror::ObjectArray<mirror::Method>::Alloc(
       soa.Self(), mirror::Method::ArrayClass(), num_methods));
   num_methods = 0;
-  for (auto& m : klass->GetDeclaredMethods(sizeof(void*))) {
+  for (auto& m : klass->GetDeclaredMethods(kRuntimePointerSize)) {
     auto modifiers = m.GetAccessFlags();
     if ((publicOnly == JNI_FALSE || (modifiers & kAccPublic) != 0) &&
         (modifiers & kAccConstructor) == 0) {
-      DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), sizeof(void*));
+      DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
       DCHECK(!Runtime::Current()->IsActiveTransaction());
-      auto* method = mirror::Method::CreateFromArtMethod<sizeof(void*), false>(soa.Self(), &m);
+      auto* method =
+          mirror::Method::CreateFromArtMethod<kRuntimePointerSize, false>(soa.Self(), &m);
       if (method == nullptr) {
         soa.Self()->AssertPendingException();
         return nullptr;
@@ -627,7 +626,7 @@
   auto* constructor = klass->GetDeclaredConstructor(
       soa.Self(),
       ScopedNullHandle<mirror::ObjectArray<mirror::Class>>(),
-      sizeof(void*));
+      kRuntimePointerSize);
   if (UNLIKELY(constructor == nullptr)) {
     soa.Self()->ThrowNewExceptionF("Ljava/lang/InstantiationException;",
                                    "%s has no zero argument constructor",
diff --git a/runtime/native/java_lang_reflect_Constructor.cc b/runtime/native/java_lang_reflect_Constructor.cc
index 54b8afd..dd46233 100644
--- a/runtime/native/java_lang_reflect_Constructor.cc
+++ b/runtime/native/java_lang_reflect_Constructor.cc
@@ -17,6 +17,7 @@
 #include "java_lang_reflect_Constructor.h"
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "class_linker.h"
 #include "class_linker-inl.h"
 #include "jni_internal.h"
@@ -65,7 +66,7 @@
 static jobjectArray Constructor_getExceptionTypes(JNIEnv* env, jobject javaMethod) {
   ScopedFastNativeObjectAccess soa(env);
   ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod)
-      ->GetInterfaceMethodIfProxy(sizeof(void*));
+      ->GetInterfaceMethodIfProxy(kRuntimePointerSize);
   mirror::ObjectArray<mirror::Class>* result_array =
       method->GetDexFile()->GetExceptionTypesForMethod(method);
   if (result_array == nullptr) {
diff --git a/runtime/native/java_lang_reflect_Method.cc b/runtime/native/java_lang_reflect_Method.cc
index 78999c2..c3f2a27 100644
--- a/runtime/native/java_lang_reflect_Method.cc
+++ b/runtime/native/java_lang_reflect_Method.cc
@@ -17,6 +17,7 @@
 #include "java_lang_reflect_Method.h"
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "class_linker.h"
 #include "class_linker-inl.h"
 #include "jni_internal.h"
@@ -57,7 +58,7 @@
     mirror::Class* klass = method->GetDeclaringClass();
     int throws_index = -1;
     size_t i = 0;
-    for (const auto& m : klass->GetDeclaredVirtualMethods(sizeof(void*))) {
+    for (const auto& m : klass->GetDeclaredVirtualMethods(kRuntimePointerSize)) {
       if (&m == method) {
         throws_index = i;
         break;
diff --git a/runtime/native_bridge_art_interface.cc b/runtime/native_bridge_art_interface.cc
index 61a1085..155c008 100644
--- a/runtime/native_bridge_art_interface.cc
+++ b/runtime/native_bridge_art_interface.cc
@@ -21,6 +21,7 @@
 #include "nativebridge/native_bridge.h"
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "dex_file-inl.h"
@@ -45,7 +46,7 @@
   mirror::Class* c = soa.Decode<mirror::Class*>(clazz);
 
   uint32_t native_method_count = 0;
-  for (auto& m : c->GetMethods(sizeof(void*))) {
+  for (auto& m : c->GetMethods(kRuntimePointerSize)) {
     native_method_count += m.IsNative() ? 1u : 0u;
   }
   return native_method_count;
@@ -60,7 +61,7 @@
   mirror::Class* c = soa.Decode<mirror::Class*>(clazz);
 
   uint32_t count = 0;
-  for (auto& m : c->GetMethods(sizeof(void*))) {
+  for (auto& m : c->GetMethods(kRuntimePointerSize)) {
     if (m.IsNative()) {
       if (count < method_count) {
         methods[count].name = m.GetName();
diff --git a/runtime/oat_file.cc b/runtime/oat_file.cc
index 61dc287..68610a7 100644
--- a/runtime/oat_file.cc
+++ b/runtime/oat_file.cc
@@ -34,6 +34,7 @@
 
 #include "art_method-inl.h"
 #include "base/bit_vector.h"
+#include "base/enums.h"
 #include "base/stl_util.h"
 #include "base/systrace.h"
 #include "base/unix_file/fd_file.h"
@@ -260,7 +261,7 @@
     return false;
   }
 
-  size_t pointer_size = GetInstructionSetPointerSize(GetOatHeader().GetInstructionSet());
+  PointerSize pointer_size = GetInstructionSetPointerSize(GetOatHeader().GetInstructionSet());
   uint8_t* dex_cache_arrays = bss_begin_;
   uint32_t dex_file_count = GetOatHeader().GetDexFileCount();
   oat_dex_files_storage_.reserve(dex_file_count);
diff --git a/runtime/offsets.h b/runtime/offsets.h
index 9d5063f..aaf5c0c 100644
--- a/runtime/offsets.h
+++ b/runtime/offsets.h
@@ -19,6 +19,7 @@
 
 #include <ostream>
 
+#include "base/enums.h"
 #include "globals.h"
 
 namespace art {
@@ -51,12 +52,15 @@
 };
 
 // Offsets relative to the current running thread.
-template<size_t pointer_size>
+template<PointerSize pointer_size>
 class ThreadOffset : public Offset {
  public:
   explicit ThreadOffset(size_t val) : Offset(val) {}
 };
 
+using ThreadOffset32 = ThreadOffset<PointerSize::k32>;
+using ThreadOffset64 = ThreadOffset<PointerSize::k64>;
+
 // Offsets relative to an object.
 class MemberOffset : public Offset {
  public:
diff --git a/runtime/proxy_test.cc b/runtime/proxy_test.cc
index 1ce7e48..82e57b4 100644
--- a/runtime/proxy_test.cc
+++ b/runtime/proxy_test.cc
@@ -18,6 +18,7 @@
 #include <vector>
 
 #include "art_field-inl.h"
+#include "base/enums.h"
 #include "class_linker-inl.h"
 #include "common_compiler_test.h"
 #include "mirror/field-inl.h"
@@ -60,31 +61,31 @@
 
     jsize array_index = 0;
     // Fill the method array
-    DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), sizeof(void*));
+    DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
     ArtMethod* method = javaLangObject->FindDeclaredVirtualMethod(
-        "equals", "(Ljava/lang/Object;)Z", sizeof(void*));
+        "equals", "(Ljava/lang/Object;)Z", kRuntimePointerSize);
     CHECK(method != nullptr);
     DCHECK(!Runtime::Current()->IsActiveTransaction());
     soa.Env()->SetObjectArrayElement(
         proxyClassMethods, array_index++, soa.AddLocalReference<jobject>(
-            mirror::Method::CreateFromArtMethod<sizeof(void*), false>(soa.Self(), method)));
-    method = javaLangObject->FindDeclaredVirtualMethod("hashCode", "()I", sizeof(void*));
+            mirror::Method::CreateFromArtMethod<kRuntimePointerSize, false>(soa.Self(), method)));
+    method = javaLangObject->FindDeclaredVirtualMethod("hashCode", "()I", kRuntimePointerSize);
     CHECK(method != nullptr);
     soa.Env()->SetObjectArrayElement(
         proxyClassMethods, array_index++, soa.AddLocalReference<jobject>(
-            mirror::Method::CreateFromArtMethod<sizeof(void*), false>(soa.Self(), method)));
+            mirror::Method::CreateFromArtMethod<kRuntimePointerSize, false>(soa.Self(), method)));
     method = javaLangObject->FindDeclaredVirtualMethod(
-        "toString", "()Ljava/lang/String;", sizeof(void*));
+        "toString", "()Ljava/lang/String;", kRuntimePointerSize);
     CHECK(method != nullptr);
     soa.Env()->SetObjectArrayElement(
         proxyClassMethods, array_index++, soa.AddLocalReference<jobject>(
-            mirror::Method::CreateFromArtMethod<sizeof(void*), false>(soa.Self(), method)));
+            mirror::Method::CreateFromArtMethod<kRuntimePointerSize, false>(soa.Self(), method)));
     // Now adds all interfaces virtual methods.
     for (mirror::Class* interface : interfaces) {
-      for (auto& m : interface->GetDeclaredVirtualMethods(sizeof(void*))) {
+      for (auto& m : interface->GetDeclaredVirtualMethods(kRuntimePointerSize)) {
         soa.Env()->SetObjectArrayElement(
             proxyClassMethods, array_index++, soa.AddLocalReference<jobject>(
-                mirror::Method::CreateFromArtMethod<sizeof(void*), false>(soa.Self(), &m)));
+                mirror::Method::CreateFromArtMethod<kRuntimePointerSize, false>(soa.Self(), &m)));
       }
     }
     CHECK_EQ(array_index, methods_count);
@@ -228,19 +229,19 @@
   EXPECT_EQ(static_fields1->At(0).GetDeclaringClass(), proxyClass1.Get());
   EXPECT_EQ(static_fields1->At(1).GetDeclaringClass(), proxyClass1.Get());
 
-  ASSERT_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), sizeof(void*));
+  ASSERT_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
   ASSERT_FALSE(Runtime::Current()->IsActiveTransaction());
   Handle<mirror::Field> field00 =
-      hs.NewHandle(mirror::Field::CreateFromArtField<sizeof(void*), false>(
+      hs.NewHandle(mirror::Field::CreateFromArtField<kRuntimePointerSize, false>(
           soa.Self(), &static_fields0->At(0), true));
   Handle<mirror::Field> field01 =
-      hs.NewHandle(mirror::Field::CreateFromArtField<sizeof(void*), false>(
+      hs.NewHandle(mirror::Field::CreateFromArtField<kRuntimePointerSize, false>(
           soa.Self(), &static_fields0->At(1), true));
   Handle<mirror::Field> field10 =
-      hs.NewHandle(mirror::Field::CreateFromArtField<sizeof(void*), false>(
+      hs.NewHandle(mirror::Field::CreateFromArtField<kRuntimePointerSize, false>(
           soa.Self(), &static_fields1->At(0), true));
   Handle<mirror::Field> field11 =
-      hs.NewHandle(mirror::Field::CreateFromArtField<sizeof(void*), false>(
+      hs.NewHandle(mirror::Field::CreateFromArtField<kRuntimePointerSize, false>(
           soa.Self(), &static_fields1->At(1), true));
   EXPECT_EQ(field00->GetArtField(), &static_fields0->At(0));
   EXPECT_EQ(field01->GetArtField(), &static_fields0->At(1));
diff --git a/runtime/quick/inline_method_analyser.cc b/runtime/quick/inline_method_analyser.cc
index 1dea562..a6e3693 100644
--- a/runtime/quick/inline_method_analyser.cc
+++ b/runtime/quick/inline_method_analyser.cc
@@ -18,6 +18,7 @@
 
 #include "art_field-inl.h"
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "class_linker-inl.h"
 #include "dex_file-inl.h"
 #include "dex_instruction.h"
@@ -145,7 +146,7 @@
   DCHECK_EQ(invoke_direct->VRegC_35c(),
             method->GetCodeItem()->registers_size_ - method->GetCodeItem()->ins_size_);
   uint32_t method_index = invoke_direct->VRegB_35c();
-  size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+  PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
   ArtMethod* target_method =
       method->GetDexCache()->GetResolvedMethod(method_index, pointer_size);
   if (kIsDebugBuild && target_method != nullptr) {
@@ -214,7 +215,7 @@
     SHARED_REQUIRES(Locks::mutator_lock_) {
   DCHECK(IsInstructionIPut(new_iput->Opcode()));
   uint32_t field_index = new_iput->VRegC_22c();
-  size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+  PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
   mirror::DexCache* dex_cache = method->GetDexCache();
   ArtField* field = dex_cache->GetResolvedField(field_index, pointer_size);
   if (UNLIKELY(field == nullptr)) {
@@ -732,7 +733,7 @@
     return false;
   }
   mirror::DexCache* dex_cache = method->GetDexCache();
-  size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+  PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
   ArtField* field = dex_cache->GetResolvedField(field_idx, pointer_size);
   if (field == nullptr || field->IsStatic()) {
     return false;
diff --git a/runtime/quick_exception_handler.cc b/runtime/quick_exception_handler.cc
index e9dd7aa..46d9e7f 100644
--- a/runtime/quick_exception_handler.cc
+++ b/runtime/quick_exception_handler.cc
@@ -18,6 +18,7 @@
 
 #include "arch/context.h"
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "dex_instruction.h"
 #include "entrypoints/entrypoint_utils.h"
 #include "entrypoints/quick/quick_entrypoints_enum.h"
@@ -509,11 +510,7 @@
   } else {
     // PC needs to be of the quick-to-interpreter bridge.
     int32_t offset;
-    #ifdef __LP64__
-        offset = GetThreadOffset<8>(kQuickQuickToInterpreterBridge).Int32Value();
-    #else
-        offset = GetThreadOffset<4>(kQuickQuickToInterpreterBridge).Int32Value();
-    #endif
+    offset = GetThreadOffset<kRuntimePointerSize>(kQuickQuickToInterpreterBridge).Int32Value();
     handler_quick_frame_pc_ = *reinterpret_cast<uintptr_t*>(
         reinterpret_cast<uint8_t*>(self_) + offset);
   }
diff --git a/runtime/reflection.cc b/runtime/reflection.cc
index 28c27cd..8a531d9 100644
--- a/runtime/reflection.cc
+++ b/runtime/reflection.cc
@@ -18,6 +18,7 @@
 
 #include "art_field-inl.h"
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "class_linker.h"
 #include "common_throws.h"
 #include "dex_file-inl.h"
@@ -222,7 +223,7 @@
     for (size_t i = 1, args_offset = 0; i < shorty_len_; ++i, ++args_offset) {
       mirror::Object* arg = args->Get(args_offset);
       if (((shorty_[i] == 'L') && (arg != nullptr)) || ((arg == nullptr && shorty_[i] != 'L'))) {
-        size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+        PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
         mirror::Class* dst_class =
             m->GetClassFromTypeIndex(classes->GetTypeItem(args_offset).type_idx_,
                                      true /* resolve */,
@@ -358,7 +359,7 @@
   }
   // TODO: If args contain object references, it may cause problems.
   Thread* const self = Thread::Current();
-  size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+  PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
   for (uint32_t i = 0; i < num_params; i++) {
     uint16_t type_idx = params->GetTypeItem(i).type_idx_;
     mirror::Class* param_type = m->GetClassFromTypeIndex(type_idx,
@@ -424,7 +425,7 @@
 
 static ArtMethod* FindVirtualMethod(mirror::Object* receiver, ArtMethod* method)
     SHARED_REQUIRES(Locks::mutator_lock_) {
-  return receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(method, sizeof(void*));
+  return receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(method, kRuntimePointerSize);
 }
 
 
@@ -434,7 +435,7 @@
     SHARED_REQUIRES(Locks::mutator_lock_) {
   uint32_t* args = arg_array->GetArray();
   if (UNLIKELY(soa.Env()->check_jni)) {
-    CheckMethodArguments(soa.Vm(), method->GetInterfaceMethodIfProxy(sizeof(void*)), args);
+    CheckMethodArguments(soa.Vm(), method->GetInterfaceMethodIfProxy(kRuntimePointerSize), args);
   }
   method->Invoke(soa.Self(), args, arg_array->GetNumBytes(), result, shorty);
 }
@@ -458,7 +459,8 @@
   }
   mirror::Object* receiver = method->IsStatic() ? nullptr : soa.Decode<mirror::Object*>(obj);
   uint32_t shorty_len = 0;
-  const char* shorty = method->GetInterfaceMethodIfProxy(sizeof(void*))->GetShorty(&shorty_len);
+  const char* shorty =
+      method->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty(&shorty_len);
   JValue result;
   ArgArray arg_array(shorty, shorty_len);
   arg_array.BuildArgArrayFromVarArgs(soa, receiver, args);
@@ -488,7 +490,8 @@
   }
   mirror::Object* receiver = method->IsStatic() ? nullptr : soa.Decode<mirror::Object*>(obj);
   uint32_t shorty_len = 0;
-  const char* shorty = method->GetInterfaceMethodIfProxy(sizeof(void*))->GetShorty(&shorty_len);
+  const char* shorty =
+      method->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty(&shorty_len);
   JValue result;
   ArgArray arg_array(shorty, shorty_len);
   arg_array.BuildArgArrayFromJValues(soa, receiver, args);
@@ -519,7 +522,8 @@
     receiver = nullptr;
   }
   uint32_t shorty_len = 0;
-  const char* shorty = method->GetInterfaceMethodIfProxy(sizeof(void*))->GetShorty(&shorty_len);
+  const char* shorty =
+      method->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty(&shorty_len);
   JValue result;
   ArgArray arg_array(shorty, shorty_len);
   arg_array.BuildArgArrayFromJValues(soa, receiver, args);
@@ -550,7 +554,8 @@
     receiver = nullptr;
   }
   uint32_t shorty_len = 0;
-  const char* shorty = method->GetInterfaceMethodIfProxy(sizeof(void*))->GetShorty(&shorty_len);
+  const char* shorty =
+      method->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty(&shorty_len);
   JValue result;
   ArgArray arg_array(shorty, shorty_len);
   arg_array.BuildArgArrayFromVarArgs(soa, receiver, args);
@@ -602,13 +607,13 @@
       }
 
       // Find the actual implementation of the virtual method.
-      m = receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(m, sizeof(void*));
+      m = receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(m, kRuntimePointerSize);
     }
   }
 
   // Get our arrays of arguments and their types, and check they're the same size.
   auto* objects = soa.Decode<mirror::ObjectArray<mirror::Object>*>(javaArgs);
-  auto* np_method = m->GetInterfaceMethodIfProxy(sizeof(void*));
+  auto* np_method = m->GetInterfaceMethodIfProxy(kRuntimePointerSize);
   const DexFile::TypeList* classes = np_method->GetParameterTypeList();
   uint32_t classes_size = (classes == nullptr) ? 0 : classes->Size();
   uint32_t arg_count = (objects != nullptr) ? objects->GetLength() : 0;
@@ -775,8 +780,9 @@
                                                  UnboxingFailureKind(f).c_str(),
                                                  PrettyDescriptor(dst_class).c_str()).c_str());
     } else {
-      ThrowNullPointerException(StringPrintf("Expected to unbox a '%s' primitive type but was returned null",
-                                             PrettyDescriptor(dst_class).c_str()).c_str());
+      ThrowNullPointerException(
+          StringPrintf("Expected to unbox a '%s' primitive type but was returned null",
+                       PrettyDescriptor(dst_class).c_str()).c_str());
     }
     return false;
   }
diff --git a/runtime/reflection_test.cc b/runtime/reflection_test.cc
index a098bf0..016f3c7 100644
--- a/runtime/reflection_test.cc
+++ b/runtime/reflection_test.cc
@@ -21,6 +21,7 @@
 #include "ScopedLocalRef.h"
 
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "common_compiler_test.h"
 #include "scoped_thread_state_change.h"
 
@@ -107,8 +108,8 @@
                                                 class_loader);
     CHECK(c != nullptr);
 
-    *method = is_static ? c->FindDirectMethod(method_name, method_signature, sizeof(void*))
-                        : c->FindVirtualMethod(method_name, method_signature, sizeof(void*));
+    *method = is_static ? c->FindDirectMethod(method_name, method_signature, kRuntimePointerSize)
+                        : c->FindVirtualMethod(method_name, method_signature, kRuntimePointerSize);
     CHECK(method != nullptr);
 
     if (is_static) {
@@ -517,7 +518,9 @@
   mirror::Class* klass = class_linker_->FindClass(soa.Self(), "LMain;", class_loader);
   ASSERT_TRUE(klass != nullptr);
 
-  ArtMethod* method = klass->FindDirectMethod("main", "([Ljava/lang/String;)V", sizeof(void*));
+  ArtMethod* method = klass->FindDirectMethod("main",
+                                              "([Ljava/lang/String;)V",
+                                              kRuntimePointerSize);
   ASSERT_TRUE(method != nullptr);
 
   // Start runtime.
diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index 079c079..9f0ef7c 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -55,6 +55,7 @@
 #include "atomic.h"
 #include "base/arena_allocator.h"
 #include "base/dumpable.h"
+#include "base/enums.h"
 #include "base/stl_util.h"
 #include "base/systrace.h"
 #include "base/unix_file/fd_file.h"
@@ -1508,7 +1509,7 @@
   // Visiting the roots of these ArtMethods is not currently required since all the GcRoots are
   // null.
   BufferedRootVisitor<16> buffered_visitor(visitor, RootInfo(kRootVMInternal));
-  const size_t pointer_size = GetClassLinker()->GetImagePointerSize();
+  const PointerSize pointer_size = GetClassLinker()->GetImagePointerSize();
   if (HasResolutionMethod()) {
     resolution_method_->VisitRoots(buffered_visitor, pointer_size);
   }
@@ -1592,7 +1593,7 @@
   ClassLinker* const class_linker = GetClassLinker();
   ArtMethod* method = class_linker->CreateRuntimeMethod(linear_alloc);
   // When compiling, the code pointer will get set later when the image is loaded.
-  const size_t pointer_size = GetInstructionSetPointerSize(instruction_set_);
+  const PointerSize pointer_size = GetInstructionSetPointerSize(instruction_set_);
   if (IsAotCompiler()) {
     method->SetEntryPointFromQuickCompiledCodePtrSize(nullptr, pointer_size);
   } else {
@@ -1614,7 +1615,7 @@
   auto* method = GetClassLinker()->CreateRuntimeMethod(GetLinearAlloc());
   // When compiling, the code pointer will get set later when the image is loaded.
   if (IsAotCompiler()) {
-    size_t pointer_size = GetInstructionSetPointerSize(instruction_set_);
+    PointerSize pointer_size = GetInstructionSetPointerSize(instruction_set_);
     method->SetEntryPointFromQuickCompiledCodePtrSize(nullptr, pointer_size);
   } else {
     method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionStub());
@@ -1624,7 +1625,7 @@
 
 ArtMethod* Runtime::CreateCalleeSaveMethod() {
   auto* method = GetClassLinker()->CreateRuntimeMethod(GetLinearAlloc());
-  size_t pointer_size = GetInstructionSetPointerSize(instruction_set_);
+  PointerSize pointer_size = GetInstructionSetPointerSize(instruction_set_);
   method->SetEntryPointFromQuickCompiledCodePtrSize(nullptr, pointer_size);
   DCHECK_NE(instruction_set_, kNone);
   DCHECK(method->IsRuntimeMethod());
@@ -1919,7 +1920,7 @@
 
 void Runtime::FixupConflictTables() {
   // We can only do this after the class linker is created.
-  const size_t pointer_size = GetClassLinker()->GetImagePointerSize();
+  const PointerSize pointer_size = GetClassLinker()->GetImagePointerSize();
   if (imt_unimplemented_method_->GetImtConflictTable(pointer_size) == nullptr) {
     imt_unimplemented_method_->SetImtConflictTable(
         ClassLinker::CreateImtConflictTable(/*count*/0u, GetLinearAlloc(), pointer_size),
diff --git a/runtime/stack.cc b/runtime/stack.cc
index 1d913f2..dc5cada 100644
--- a/runtime/stack.cc
+++ b/runtime/stack.cc
@@ -18,6 +18,7 @@
 
 #include "arch/context.h"
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/hex_dump.h"
 #include "entrypoints/entrypoint_utils-inl.h"
 #include "entrypoints/runtime_asm_entrypoints.h"
@@ -167,7 +168,7 @@
     SHARED_REQUIRES(Locks::mutator_lock_);
 
 mirror::Object* StackVisitor::GetThisObject() const {
-  DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), sizeof(void*));
+  DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
   ArtMethod* m = GetMethod();
   if (m->IsStatic()) {
     return nullptr;
@@ -748,7 +749,8 @@
   // The only remaining case is if the method is native and uses the generic JNI stub.
   DCHECK(method->IsNative());
   ClassLinker* class_linker = runtime->GetClassLinker();
-  const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(method, sizeof(void*));
+  const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(method,
+                                                                           kRuntimePointerSize);
   DCHECK(class_linker->IsQuickGenericJniStub(entry_point)) << PrettyMethod(method);
   // Generic JNI frame.
   uint32_t handle_refs = GetNumberOfReferenceArgsWithoutReceiver(method) + 1;
@@ -908,7 +910,7 @@
 int StackVisitor::GetVRegOffsetFromQuickCode(const DexFile::CodeItem* code_item,
                                              uint32_t core_spills, uint32_t fp_spills,
                                              size_t frame_size, int reg, InstructionSet isa) {
-  size_t pointer_size = InstructionSetPointerSize(isa);
+  PointerSize pointer_size = InstructionSetPointerSize(isa);
   if (kIsDebugBuild) {
     auto* runtime = Runtime::Current();
     if (runtime != nullptr) {
@@ -931,7 +933,8 @@
      * Special temporaries may have custom locations and the logic above deals with that.
      * However, non-special temporaries are placed relative to the outs.
      */
-    int temps_start = code_item->outs_size_ * sizeof(uint32_t) + pointer_size /* art method */;
+    int temps_start = code_item->outs_size_ * sizeof(uint32_t)
+        + static_cast<size_t>(pointer_size) /* art method */;
     int relative_offset = (reg - (temp_threshold + max_num_special_temps)) * sizeof(uint32_t);
     return temps_start + relative_offset;
   }  else if (reg < num_regs) {
@@ -939,7 +942,8 @@
     return locals_start + (reg * sizeof(uint32_t));
   } else {
     // Handle ins.
-    return frame_size + ((reg - num_regs) * sizeof(uint32_t)) + pointer_size /* art method */;
+    return frame_size + ((reg - num_regs) * sizeof(uint32_t))
+        + static_cast<size_t>(pointer_size) /* art method */;
   }
 }
 
diff --git a/runtime/stack.h b/runtime/stack.h
index c594ec6..cf33ae1 100644
--- a/runtime/stack.h
+++ b/runtime/stack.h
@@ -734,7 +734,7 @@
 
   static int GetOutVROffset(uint16_t out_num, InstructionSet isa) {
     // According to stack model, the first out is above the Method referernce.
-    return InstructionSetPointerSize(isa) + out_num * sizeof(uint32_t);
+    return static_cast<size_t>(InstructionSetPointerSize(isa)) + out_num * sizeof(uint32_t);
   }
 
   bool IsInInlinedFrame() const {
diff --git a/runtime/thread.cc b/runtime/thread.cc
index 9cce171..76f3161 100644
--- a/runtime/thread.cc
+++ b/runtime/thread.cc
@@ -1383,7 +1383,7 @@
     if (m->IsRuntimeMethod()) {
       return true;
     }
-    m = m->GetInterfaceMethodIfProxy(sizeof(void*));
+    m = m->GetInterfaceMethodIfProxy(kRuntimePointerSize);
     const int kMaxRepetition = 3;
     mirror::Class* c = m->GetDeclaringClass();
     mirror::DexCache* dex_cache = c->GetDexCache();
@@ -2111,7 +2111,7 @@
   // the i'th frame.
   mirror::ObjectArray<mirror::Object>* trace_;
   // For cross compilation.
-  const size_t pointer_size_;
+  const PointerSize pointer_size_;
 
   DISALLOW_COPY_AND_ASSIGN(BuildInternalStackTraceVisitor);
 };
@@ -2198,9 +2198,9 @@
     mirror::PointerArray* const method_trace =
         down_cast<mirror::PointerArray*>(decoded_traces->Get(0));
     // Prepare parameters for StackTraceElement(String cls, String method, String file, int line)
-    ArtMethod* method = method_trace->GetElementPtrSize<ArtMethod*>(i, sizeof(void*));
+    ArtMethod* method = method_trace->GetElementPtrSize<ArtMethod*>(i, kRuntimePointerSize);
     uint32_t dex_pc = method_trace->GetElementPtrSize<uint32_t>(
-        i + method_trace->GetLength() / 2, sizeof(void*));
+        i + method_trace->GetLength() / 2, kRuntimePointerSize);
     int32_t line_number;
     StackHandleScope<3> hs(soa.Self());
     auto class_name_object(hs.NewHandle<mirror::String>(nullptr));
@@ -2231,7 +2231,7 @@
         }
       }
     }
-    const char* method_name = method->GetInterfaceMethodIfProxy(sizeof(void*))->GetName();
+    const char* method_name = method->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetName();
     CHECK(method_name != nullptr);
     Handle<mirror::String> method_name_object(
         hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name)));
@@ -2408,10 +2408,12 @@
 }
 
 // Explicitly instantiate 32 and 64bit thread offset dumping support.
-template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset);
-template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset);
+template
+void Thread::DumpThreadOffset<PointerSize::k32>(std::ostream& os, uint32_t offset);
+template
+void Thread::DumpThreadOffset<PointerSize::k64>(std::ostream& os, uint32_t offset);
 
-template<size_t ptr_size>
+template<PointerSize ptr_size>
 void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) {
 #define DO_THREAD_OFFSET(x, y) \
     if (offset == (x).Uint32Value()) { \
diff --git a/runtime/thread.h b/runtime/thread.h
index 9a4eb97..840b781 100644
--- a/runtime/thread.h
+++ b/runtime/thread.h
@@ -28,6 +28,7 @@
 #include "arch/context.h"
 #include "arch/instruction_set.h"
 #include "atomic.h"
+#include "base/enums.h"
 #include "base/macros.h"
 #include "base/mutex.h"
 #include "entrypoints/jni/jni_entrypoints.h"
@@ -179,7 +180,7 @@
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Translates 172 to pAllocArrayFromCode and so on.
-  template<size_t size_of_pointers>
+  template<PointerSize size_of_pointers>
   static void DumpThreadOffset(std::ostream& os, uint32_t offset);
 
   // Dumps a one-line summary of thread state (used for operator<<).
@@ -532,21 +533,21 @@
   // Offsets of various members of native Thread class, used by compiled code.
   //
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> ThinLockIdOffset() {
     return ThreadOffset<pointer_size>(
         OFFSETOF_MEMBER(Thread, tls32_) +
         OFFSETOF_MEMBER(tls_32bit_sized_values, thin_lock_thread_id));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> ThreadFlagsOffset() {
     return ThreadOffset<pointer_size>(
         OFFSETOF_MEMBER(Thread, tls32_) +
         OFFSETOF_MEMBER(tls_32bit_sized_values, state_and_flags));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> IsGcMarkingOffset() {
     return ThreadOffset<pointer_size>(
         OFFSETOF_MEMBER(Thread, tls32_) +
@@ -557,121 +558,125 @@
   void DeoptimizeWithDeoptimizationException(JValue* result) SHARED_REQUIRES(Locks::mutator_lock_);
 
  private:
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> ThreadOffsetFromTlsPtr(size_t tls_ptr_offset) {
     size_t base = OFFSETOF_MEMBER(Thread, tlsPtr_);
     size_t scale;
     size_t shrink;
-    if (pointer_size == sizeof(void*)) {
+    if (pointer_size == kRuntimePointerSize) {
       scale = 1;
       shrink = 1;
-    } else if (pointer_size > sizeof(void*)) {
-      scale = pointer_size / sizeof(void*);
+    } else if (pointer_size > kRuntimePointerSize) {
+      scale = static_cast<size_t>(pointer_size) / static_cast<size_t>(kRuntimePointerSize);
       shrink = 1;
     } else {
-      DCHECK_GT(sizeof(void*), pointer_size);
+      DCHECK_GT(kRuntimePointerSize, pointer_size);
       scale = 1;
-      shrink = sizeof(void*) / pointer_size;
+      shrink = static_cast<size_t>(kRuntimePointerSize) / static_cast<size_t>(pointer_size);
     }
     return ThreadOffset<pointer_size>(base + ((tls_ptr_offset * scale) / shrink));
   }
 
  public:
   static uint32_t QuickEntryPointOffsetWithSize(size_t quick_entrypoint_offset,
-                                                size_t pointer_size) {
-    DCHECK(pointer_size == 4 || pointer_size == 8) << pointer_size;
-    if (pointer_size == 4) {
-      return QuickEntryPointOffset<4>(quick_entrypoint_offset).Uint32Value();
+                                                PointerSize pointer_size) {
+    if (pointer_size == PointerSize::k32) {
+      return QuickEntryPointOffset<PointerSize::k32>(quick_entrypoint_offset).
+          Uint32Value();
     } else {
-      return QuickEntryPointOffset<8>(quick_entrypoint_offset).Uint32Value();
+      return QuickEntryPointOffset<PointerSize::k64>(quick_entrypoint_offset).
+          Uint32Value();
     }
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> QuickEntryPointOffset(size_t quick_entrypoint_offset) {
     return ThreadOffsetFromTlsPtr<pointer_size>(
         OFFSETOF_MEMBER(tls_ptr_sized_values, quick_entrypoints) + quick_entrypoint_offset);
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> JniEntryPointOffset(size_t jni_entrypoint_offset) {
     return ThreadOffsetFromTlsPtr<pointer_size>(
         OFFSETOF_MEMBER(tls_ptr_sized_values, jni_entrypoints) + jni_entrypoint_offset);
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> SelfOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values, self));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> MterpCurrentIBaseOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(
         OFFSETOF_MEMBER(tls_ptr_sized_values, mterp_current_ibase));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> MterpDefaultIBaseOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(
         OFFSETOF_MEMBER(tls_ptr_sized_values, mterp_default_ibase));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> MterpAltIBaseOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(
         OFFSETOF_MEMBER(tls_ptr_sized_values, mterp_alt_ibase));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> ExceptionOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values, exception));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> PeerOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values, opeer));
   }
 
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> CardTableOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values, card_table));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> ThreadSuspendTriggerOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(
         OFFSETOF_MEMBER(tls_ptr_sized_values, suspend_trigger));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> ThreadLocalPosOffset() {
-    return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values, thread_local_pos));
+    return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values,
+                                                                thread_local_pos));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> ThreadLocalEndOffset() {
-    return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values, thread_local_end));
+    return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values,
+                                                                thread_local_end));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> ThreadLocalObjectsOffset() {
-    return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values, thread_local_objects));
+    return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values,
+                                                                thread_local_objects));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> RosAllocRunsOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values,
                                                                 rosalloc_runs));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> ThreadLocalAllocStackTopOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values,
                                                                 thread_local_alloc_stack_top));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> ThreadLocalAllocStackEndOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values,
                                                                 thread_local_alloc_stack_end));
@@ -713,19 +718,19 @@
     return tlsPtr_.stack_end == tlsPtr_.stack_begin;
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> StackEndOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(
         OFFSETOF_MEMBER(tls_ptr_sized_values, stack_end));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> JniEnvOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(
         OFFSETOF_MEMBER(tls_ptr_sized_values, jni_env));
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> TopOfManagedStackOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(
         OFFSETOF_MEMBER(tls_ptr_sized_values, managed_stack) +
@@ -752,7 +757,7 @@
     return tlsPtr_.managed_stack.PopShadowFrame();
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> TopShadowFrameOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(
         OFFSETOF_MEMBER(tls_ptr_sized_values, managed_stack) +
@@ -794,7 +799,7 @@
     return handle_scope;
   }
 
-  template<size_t pointer_size>
+  template<PointerSize pointer_size>
   static ThreadOffset<pointer_size> TopHandleScopeOffset() {
     return ThreadOffsetFromTlsPtr<pointer_size>(OFFSETOF_MEMBER(tls_ptr_sized_values,
                                                                 top_handle_scope));
diff --git a/runtime/trace.cc b/runtime/trace.cc
index 1e15960..56a26de 100644
--- a/runtime/trace.cc
+++ b/runtime/trace.cc
@@ -21,6 +21,7 @@
 
 #include "art_method-inl.h"
 #include "base/casts.h"
+#include "base/enums.h"
 #include "base/stl_util.h"
 #include "base/systrace.h"
 #include "base/time_utils.h"
@@ -854,7 +855,7 @@
 }
 
 std::string Trace::GetMethodLine(ArtMethod* method) {
-  method = method->GetInterfaceMethodIfProxy(sizeof(void*));
+  method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
   return StringPrintf("%#x\t%s\t%s\t%s\t%s\n", (EncodeTraceMethod(method) << TraceActionBits),
       PrettyDescriptor(method->GetDeclaringClassDescriptor()).c_str(), method->GetName(),
       method->GetSignature().ToString().c_str(), method->GetDeclaringClassSourceFile());
diff --git a/runtime/utils/dex_cache_arrays_layout-inl.h b/runtime/utils/dex_cache_arrays_layout-inl.h
index 6922564..7733a51 100644
--- a/runtime/utils/dex_cache_arrays_layout-inl.h
+++ b/runtime/utils/dex_cache_arrays_layout-inl.h
@@ -27,7 +27,7 @@
 
 namespace art {
 
-inline DexCacheArraysLayout::DexCacheArraysLayout(size_t pointer_size,
+inline DexCacheArraysLayout::DexCacheArraysLayout(PointerSize pointer_size,
                                                   const DexFile::Header& header)
     : pointer_size_(pointer_size),
       /* types_offset_ is always 0u, so it's constexpr */
@@ -39,10 +39,9 @@
           RoundUp(strings_offset_ + StringsSize(header.string_ids_size_), FieldsAlignment())),
       size_(
           RoundUp(fields_offset_ + FieldsSize(header.field_ids_size_), Alignment())) {
-  DCHECK(ValidPointerSize(pointer_size)) << pointer_size;
 }
 
-inline DexCacheArraysLayout::DexCacheArraysLayout(size_t pointer_size, const DexFile* dex_file)
+inline DexCacheArraysLayout::DexCacheArraysLayout(PointerSize pointer_size, const DexFile* dex_file)
     : DexCacheArraysLayout(pointer_size, dex_file->GetHeader()) {
 }
 
@@ -50,19 +49,24 @@
   // GcRoot<> alignment is 4, i.e. lower than or equal to the pointer alignment.
   static_assert(alignof(GcRoot<mirror::Class>) == 4, "Expecting alignof(GcRoot<>) == 4");
   static_assert(alignof(GcRoot<mirror::String>) == 4, "Expecting alignof(GcRoot<>) == 4");
-  DCHECK(pointer_size_ == 4u || pointer_size_ == 8u);
   // Pointer alignment is the same as pointer size.
-  return pointer_size_;
+  return static_cast<size_t>(pointer_size_);
+}
+
+template <typename T>
+static constexpr PointerSize GcRootAsPointerSize() {
+  return ConvertToPointerSize(sizeof(GcRoot<T>));
 }
 
 inline size_t DexCacheArraysLayout::TypeOffset(uint32_t type_idx) const {
-  return types_offset_ + ElementOffset(sizeof(GcRoot<mirror::Class>), type_idx);
+  return types_offset_ + ElementOffset(GcRootAsPointerSize<mirror::Class>(), type_idx);
 }
 
 inline size_t DexCacheArraysLayout::TypesSize(size_t num_elements) const {
   // App image patching relies on having enough room for a forwarding pointer in the types array.
   // See FixupArtMethodArrayVisitor and ClassLinker::AddImageSpace.
-  return std::max(ArraySize(sizeof(GcRoot<mirror::Class>), num_elements), pointer_size_);
+  return std::max(ArraySize(GcRootAsPointerSize<mirror::Class>(), num_elements),
+                  static_cast<size_t>(pointer_size_));
 }
 
 inline size_t DexCacheArraysLayout::TypesAlignment() const {
@@ -75,19 +79,19 @@
 
 inline size_t DexCacheArraysLayout::MethodsSize(size_t num_elements) const {
   // App image patching relies on having enough room for a forwarding pointer in the methods array.
-  return std::max(ArraySize(pointer_size_, num_elements), pointer_size_);
+  return std::max(ArraySize(pointer_size_, num_elements), static_cast<size_t>(pointer_size_));
 }
 
 inline size_t DexCacheArraysLayout::MethodsAlignment() const {
-  return pointer_size_;
+  return static_cast<size_t>(pointer_size_);
 }
 
 inline size_t DexCacheArraysLayout::StringOffset(uint32_t string_idx) const {
-  return strings_offset_ + ElementOffset(sizeof(GcRoot<mirror::String>), string_idx);
+  return strings_offset_ + ElementOffset(GcRootAsPointerSize<mirror::String>(), string_idx);
 }
 
 inline size_t DexCacheArraysLayout::StringsSize(size_t num_elements) const {
-  return ArraySize(sizeof(GcRoot<mirror::String>), num_elements);
+  return ArraySize(GcRootAsPointerSize<mirror::String>(), num_elements);
 }
 
 inline size_t DexCacheArraysLayout::StringsAlignment() const {
@@ -103,15 +107,15 @@
 }
 
 inline size_t DexCacheArraysLayout::FieldsAlignment() const {
-  return pointer_size_;
+  return static_cast<size_t>(pointer_size_);
 }
 
-inline size_t DexCacheArraysLayout::ElementOffset(size_t element_size, uint32_t idx) {
-  return element_size * idx;
+inline size_t DexCacheArraysLayout::ElementOffset(PointerSize element_size, uint32_t idx) {
+  return static_cast<size_t>(element_size) * idx;
 }
 
-inline size_t DexCacheArraysLayout::ArraySize(size_t element_size, uint32_t num_elements) {
-  return element_size * num_elements;
+inline size_t DexCacheArraysLayout::ArraySize(PointerSize element_size, uint32_t num_elements) {
+  return static_cast<size_t>(element_size) * num_elements;
 }
 
 }  // namespace art
diff --git a/runtime/utils/dex_cache_arrays_layout.h b/runtime/utils/dex_cache_arrays_layout.h
index cd84460..f2437fa 100644
--- a/runtime/utils/dex_cache_arrays_layout.h
+++ b/runtime/utils/dex_cache_arrays_layout.h
@@ -31,7 +31,7 @@
   // Construct an invalid layout.
   DexCacheArraysLayout()
       : /* types_offset_ is always 0u */
-        pointer_size_(0u),
+        pointer_size_(kRuntimePointerSize),
         methods_offset_(0u),
         strings_offset_(0u),
         fields_offset_(0u),
@@ -39,10 +39,10 @@
   }
 
   // Construct a layout for a particular dex file header.
-  DexCacheArraysLayout(size_t pointer_size, const DexFile::Header& header);
+  DexCacheArraysLayout(PointerSize pointer_size, const DexFile::Header& header);
 
   // Construct a layout for a particular dex file.
-  DexCacheArraysLayout(size_t pointer_size, const DexFile* dex_file);
+  DexCacheArraysLayout(PointerSize pointer_size, const DexFile* dex_file);
 
   bool Valid() const {
     return Size() != 0u;
@@ -96,17 +96,17 @@
 
  private:
   static constexpr size_t types_offset_ = 0u;
-  const size_t pointer_size_;  // Must be first for construction initialization order.
+  const PointerSize pointer_size_;  // Must be first for construction initialization order.
   const size_t methods_offset_;
   const size_t strings_offset_;
   const size_t fields_offset_;
   const size_t size_;
 
-  static size_t Alignment(size_t pointer_size);
+  static size_t Alignment(PointerSize pointer_size);
 
-  static size_t ElementOffset(size_t element_size, uint32_t idx);
+  static size_t ElementOffset(PointerSize element_size, uint32_t idx);
 
-  static size_t ArraySize(size_t element_size, uint32_t num_elements);
+  static size_t ArraySize(PointerSize element_size, uint32_t num_elements);
 };
 
 }  // namespace art
diff --git a/runtime/utils_test.cc b/runtime/utils_test.cc
index f00edff..55b6e01 100644
--- a/runtime/utils_test.cc
+++ b/runtime/utils_test.cc
@@ -16,6 +16,7 @@
 
 #include "utils.h"
 
+#include "base/enums.h"
 #include "class_linker-inl.h"
 #include "common_runtime_test.h"
 #include "mirror/array.h"
@@ -187,17 +188,17 @@
   ASSERT_TRUE(c != nullptr);
   ArtMethod* m;
 
-  m = c->FindVirtualMethod("charAt", "(I)C", sizeof(void*));
+  m = c->FindVirtualMethod("charAt", "(I)C", kRuntimePointerSize);
   ASSERT_TRUE(m != nullptr);
   EXPECT_EQ("Java_java_lang_String_charAt", JniShortName(m));
   EXPECT_EQ("Java_java_lang_String_charAt__I", JniLongName(m));
 
-  m = c->FindVirtualMethod("indexOf", "(Ljava/lang/String;I)I", sizeof(void*));
+  m = c->FindVirtualMethod("indexOf", "(Ljava/lang/String;I)I", kRuntimePointerSize);
   ASSERT_TRUE(m != nullptr);
   EXPECT_EQ("Java_java_lang_String_indexOf", JniShortName(m));
   EXPECT_EQ("Java_java_lang_String_indexOf__Ljava_lang_String_2I", JniLongName(m));
 
-  m = c->FindDirectMethod("copyValueOf", "([CII)Ljava/lang/String;", sizeof(void*));
+  m = c->FindDirectMethod("copyValueOf", "([CII)Ljava/lang/String;", kRuntimePointerSize);
   ASSERT_TRUE(m != nullptr);
   EXPECT_EQ("Java_java_lang_String_copyValueOf", JniShortName(m));
   EXPECT_EQ("Java_java_lang_String_copyValueOf___3CII", JniLongName(m));
diff --git a/runtime/verifier/method_verifier.cc b/runtime/verifier/method_verifier.cc
index f2ae85a..8eeeef6 100644
--- a/runtime/verifier/method_verifier.cc
+++ b/runtime/verifier/method_verifier.cc
@@ -20,6 +20,7 @@
 
 #include "art_field-inl.h"
 #include "art_method-inl.h"
+#include "base/enums.h"
 #include "base/logging.h"
 #include "base/mutex-inl.h"
 #include "base/stl_util.h"
@@ -2839,7 +2840,7 @@
       ArtMethod* called_method = VerifyInvocationArgs(inst, type, is_range);
       const RegType* return_type = nullptr;
       if (called_method != nullptr) {
-        size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+        PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
         mirror::Class* return_type_class = called_method->GetReturnType(can_load_classes_,
                                                                         pointer_size);
         if (return_type_class != nullptr) {
@@ -2882,7 +2883,7 @@
       } else {
         is_constructor = called_method->IsConstructor();
         return_type_descriptor = called_method->GetReturnTypeDescriptor();
-        size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+        PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
         mirror::Class* return_type_class = called_method->GetReturnType(can_load_classes_,
                                                                         pointer_size);
         if (return_type_class != nullptr) {
@@ -4969,7 +4970,7 @@
 const RegType& MethodVerifier::GetMethodReturnType() {
   if (return_type_ == nullptr) {
     if (mirror_method_ != nullptr) {
-      size_t pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
+      PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
       mirror::Class* return_type_class = mirror_method_->GetReturnType(can_load_classes_,
                                                                        pointer_size);
       if (return_type_class != nullptr) {