Support verified heap pointer writes on ia32.

runtime/vm/code_patcher_ia32.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/assembler.h"
 #include "vm/code_patcher.h"
 #include "vm/cpu.h"
 #include "vm/dart_entry.h"
+#include "vm/flow_graph_compiler.h"
 #include "vm/instructions.h"
 #include "vm/object.h"
 #include "vm/raw_object.h"
 
 namespace dart {
 
 // The expected pattern of a Dart unoptimized call (static and instance):
 //  mov ECX, ic-data
 //  call target_address (stub)
 //  <- return address
@@ skipping 246 matching lines @@
 intptr_t CodePatcher::InstanceCallSizeInBytes() {
   return InstanceCall::kNumInstructions * InstanceCall::kInstructionSize;
 }
 
 
 // The expected code pattern of an edge counter in unoptimized code:
 //  b8 imm32    mov EAX, immediate
 class EdgeCounter : public ValueObject {
  public:
   EdgeCounter(uword pc, const Code& ignored)
-      : end_(pc - CodePatcher::EdgeCounterIncrementSizeInBytes()) {
+      : end_(pc - FlowGraphCompiler::EdgeCounterIncrementSizeInBytes()) {
     ASSERT(IsValid(end_));
   }
 
   static bool IsValid(uword end) {
     return (*reinterpret_cast<uint8_t*>(end - 5) == 0xb8);
   }
 
   RawObject* edge_counter() const {
     return *reinterpret_cast<RawObject**>(end_ - 4);
   }
 
  private:
   uword end_;
 };
 
 
-int32_t CodePatcher::EdgeCounterIncrementSizeInBytes() {
-  // The edge counter load is followed by the fixed-size edge counter
-  // incrementing code:
-  //     83 40 0b 02               add [eax+0xb],0x2
-  return 4;
-}
-
-
 RawObject* CodePatcher::GetEdgeCounterAt(uword pc, const Code& code) {
   ASSERT(code.ContainsInstructionAt(pc));
   EdgeCounter counter(pc, code);
   return counter.edge_counter();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32