zra@google.com
df2054dae7
R=fschneider@google.com, srdjan@google.com Review URL: https://codereview.chromium.org//22825023 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@27295 260f80e4-7a28-3924-810f-c04153c831b5
96 lines
2.6 KiB
C++
96 lines
2.6 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/cpu.h"
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#include "vm/instructions.h"
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#include "vm/object.h"
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namespace dart {
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intptr_t InstructionPattern::IndexFromPPLoad(uword start) {
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int32_t offset = *reinterpret_cast<int32_t*>(start);
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offset += kHeapObjectTag;
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return (offset - Array::data_offset()) / kWordSize;
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}
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bool InstructionPattern::TestBytesWith(const int* data, int num_bytes) const {
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ASSERT(data != NULL);
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const uint8_t* byte_array = reinterpret_cast<const uint8_t*>(start_);
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for (int i = 0; i < num_bytes; i++) {
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// Skip comparison for data[i] < 0.
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if ((data[i] >= 0) && (byte_array[i] != (0xFF & data[i]))) {
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return false;
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}
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}
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return true;
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}
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uword CallPattern::TargetAddress() const {
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ASSERT(IsValid());
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return *reinterpret_cast<uword*>(start() + 2);
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}
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void CallPattern::SetTargetAddress(uword target) const {
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ASSERT(IsValid());
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*reinterpret_cast<uword*>(start() + 2) = target;
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CPU::FlushICache(start() + 2, kWordSize);
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}
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const int* CallPattern::pattern() const {
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// movq $target, TMP
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// callq *TMP
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static const int kCallPattern[kLengthInBytes] =
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{0x49, 0xBB, -1, -1, -1, -1, -1, -1, -1, -1, 0x41, 0xFF, 0xD3};
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return kCallPattern;
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}
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uword JumpPattern::TargetAddress() const {
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ASSERT(IsValid());
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int index = InstructionPattern::IndexFromPPLoad(start() + 3);
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return reinterpret_cast<uword>(object_pool_.At(index));
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}
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void JumpPattern::SetTargetAddress(uword target) const {
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ASSERT(IsValid());
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int index = InstructionPattern::IndexFromPPLoad(start() + 3);
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const Smi& smi = Smi::Handle(reinterpret_cast<RawSmi*>(target));
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object_pool_.SetAt(index, smi);
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// No need to flush the instruction cache, since the code is not modified.
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}
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const int* JumpPattern::pattern() const {
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// 00: 4d 8b 9d imm32 mov R11, [R13 + off]
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// 07: 41 ff e3 jmpq R11
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static const int kJumpPattern[kLengthInBytes] =
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{0x4D, 0x8B, -1, -1, -1, -1, -1, 0x41, 0xFF, 0xE3};
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return kJumpPattern;
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}
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void ShortCallPattern::SetTargetAddress(uword target) const {
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ASSERT(IsValid());
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*reinterpret_cast<uint32_t*>(start() + 1) = target - start() - kLengthInBytes;
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CPU::FlushICache(start() + 1, kWordSize);
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}
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const int* ShortCallPattern::pattern() const {
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static const int kCallPattern[kLengthInBytes] = {0xE8, -1, -1, -1, -1};
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return kCallPattern;
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_X64
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