- Annotate instructions that load objects from the ObjectPool or Thread.

runtime/vm/instructions_x64.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_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/cpu.h"
+#include "vm/constants_x64.h"
 #include "vm/instructions.h"
 #include "vm/object.h"
 
 namespace dart {
 
 void ShortCallPattern::SetTargetAddress(uword target) const {
   ASSERT(IsValid());
   *reinterpret_cast<uint32_t*>(start() + 1) = target - start() - kLengthInBytes;
   CPU::FlushICache(start() + 1, kWordSize);
 }
 
 
+bool DecodeLoadObjectFromPoolOrThread(uword pc,
+                                      const Code& code,
+                                      Object* obj) {
+  ASSERT(code.ContainsInstructionAt(pc));
+
+  uint8_t* bytes = reinterpret_cast<uint8_t*>(pc);
+  COMPILE_ASSERT(PP == R15);
+  if (((bytes[0] == 0x49) && (bytes[1] == 0x8b) && (bytes[2] == 0x9f)) ||
+      ((bytes[0] == 0x49) && (bytes[1] == 0x8b) && (bytes[2] == 0x87)) ||
+      ((bytes[0] == 0x4d) && (bytes[1] == 0x8b) && (bytes[2] == 0xa7)) ||
+      ((bytes[0] == 0x4d) && (bytes[1] == 0x8b) && (bytes[2] == 0x9f)) ||
+      ((bytes[0] == 0x4d) && (bytes[1] == 0x8b) && (bytes[2] == 0x97))) {
+    intptr_t index = IndexFromPPLoad(pc + 3);
+    const ObjectPool& pool = ObjectPool::Handle(code.object_pool());
+    if (pool.InfoAt(index) == ObjectPool::kTaggedObject) {
+      *obj = pool.ObjectAt(index);
+      return true;
+    }
+  }
+  COMPILE_ASSERT(THR == R14);
+  if (((bytes[0] == 0x49) && (bytes[1] == 0x8b) && (bytes[2] == 0x86)) ||
+      ((bytes[0] == 0x49) && (bytes[1] == 0x8b) && (bytes[2] == 0xb6)) ||
+      ((bytes[0] == 0x49) && (bytes[1] == 0x8b) && (bytes[2] == 0x96)) ||
+      ((bytes[0] == 0x49) && (bytes[1] == 0x8b) && (bytes[2] == 0x9e)) ||
+      ((bytes[0] == 0x4d) && (bytes[1] == 0x8b) && (bytes[2] == 0x9e)) ||
+      ((bytes[0] == 0x4d) && (bytes[1] == 0x8b) && (bytes[2] == 0xa6))) {
+    int32_t offset = *reinterpret_cast<int32_t*>(pc + 3);
+    return Thread::ObjectAtOffset(offset, obj);
+  }
+  if (((bytes[0] == 0x4d) && (bytes[1] == 0x8b) && (bytes[2] == 0x5e)) ||
+      ((bytes[0] == 0x4d) && (bytes[1] == 0x8b) && (bytes[2] == 0x6e))) {
+    uint8_t offset = *reinterpret_cast<uint8_t*>(pc + 3);
+    return Thread::ObjectAtOffset(offset, obj);
+  }
+
+  return false;
+}
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64