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68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/globals.h" // Needed here to get TARGET_ARCH_X64.
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#if defined(TARGET_ARCH_X64)
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#include "vm/instructions.h"
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#include "vm/instructions_x64.h"
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#include "vm/cpu.h"
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#include "vm/constants_x64.h"
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#include "vm/object.h"
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namespace dart {
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bool DecodeLoadObjectFromPoolOrThread(uword pc, const Code& code, Object* obj) {
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ASSERT(code.ContainsInstructionAt(pc));
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uint8_t* bytes = reinterpret_cast<uint8_t*>(pc);
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COMPILE_ASSERT(PP == R15);
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if ((bytes[0] == 0x49) || (bytes[0] == 0x4d)) {
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if ((bytes[1] == 0x8b) || (bytes[1] == 0x3b)) { // movq, cmpq
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if ((bytes[2] & 0xc7) == (0x80 | (PP & 7))) { // [r15+disp32]
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intptr_t index = IndexFromPPLoad(pc + 3);
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const ObjectPool& pool = ObjectPool::Handle(code.object_pool());
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if (pool.InfoAt(index) == ObjectPool::kTaggedObject) {
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*obj = pool.ObjectAt(index);
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return true;
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}
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}
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if ((bytes[2] & 0xc7) == (0x40 | (PP & 7))) { // [r15+disp8]
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intptr_t index = IndexFromPPLoadDisp8(pc + 3);
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const ObjectPool& pool = ObjectPool::Handle(code.object_pool());
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if (pool.InfoAt(index) == ObjectPool::kTaggedObject) {
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*obj = pool.ObjectAt(index);
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return true;
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}
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}
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}
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}
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COMPILE_ASSERT(THR == R14);
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if ((bytes[0] == 0x49) || (bytes[0] == 0x4d)) {
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if ((bytes[1] == 0x8b) || (bytes[1] == 0x3b)) { // movq, cmpq
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if ((bytes[2] & 0xc7) == (0x80 | (THR & 7))) { // [r14+disp32]
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int32_t offset = *reinterpret_cast<int32_t*>(pc + 3);
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return Thread::ObjectAtOffset(offset, obj);
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}
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if ((bytes[2] & 0xc7) == (0x40 | (THR & 7))) { // [r14+disp8]
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uint8_t offset = *reinterpret_cast<uint8_t*>(pc + 3);
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return Thread::ObjectAtOffset(offset, obj);
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}
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}
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}
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if (((bytes[0] == 0x41) && (bytes[1] == 0xff) && (bytes[2] == 0x76))) {
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// push [r14+disp8]
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uint8_t offset = *reinterpret_cast<uint8_t*>(pc + 3);
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return Thread::ObjectAtOffset(offset, obj);
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}
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return false;
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_X64
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