VM: Store edge counters in one per-function array.

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"
@@ skipping 214 matching lines @@
   UNREACHABLE();
   return NULL;
 }
 
 
 
 intptr_t CodePatcher::InstanceCallSizeInBytes() {
   return InstanceCall::kPatternSize;
 }
 
-
-// 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 - 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_;
-};
-
-
-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