fschneider@google.com
340299bc13
Use jmp [PP + 0xiiii] instead of movq TMP, [PP + 0xiiii] jmp TMP Also, remove some unused code from x64 assembler. R=zra@google.com Review URL: https://codereview.chromium.org//869533003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43094 260f80e4-7a28-3924-810f-c04153c831b5
79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
// 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/instructions.h"
|
|
#include "vm/object.h"
|
|
|
|
namespace dart {
|
|
|
|
intptr_t InstructionPattern::IndexFromPPLoad(uword start) {
|
|
int32_t offset = *reinterpret_cast<int32_t*>(start);
|
|
offset += kHeapObjectTag;
|
|
return (offset - Array::data_offset()) / kWordSize;
|
|
}
|
|
|
|
|
|
intptr_t InstructionPattern::OffsetFromPPIndex(intptr_t index) {
|
|
intptr_t offset = Array::element_offset(index);
|
|
return offset - kHeapObjectTag;
|
|
}
|
|
|
|
|
|
bool InstructionPattern::TestBytesWith(const int* data, int num_bytes) const {
|
|
ASSERT(data != NULL);
|
|
const uint8_t* byte_array = reinterpret_cast<const uint8_t*>(start_);
|
|
for (int i = 0; i < num_bytes; i++) {
|
|
// Skip comparison for data[i] < 0.
|
|
if ((data[i] >= 0) && (byte_array[i] != (0xFF & data[i]))) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
uword JumpPattern::TargetAddress() const {
|
|
ASSERT(IsValid());
|
|
int index = InstructionPattern::IndexFromPPLoad(start() + 3);
|
|
return reinterpret_cast<uword>(object_pool_.At(index));
|
|
}
|
|
|
|
|
|
void JumpPattern::SetTargetAddress(uword target) const {
|
|
ASSERT(IsValid());
|
|
int index = InstructionPattern::IndexFromPPLoad(start() + 3);
|
|
const Smi& smi = Smi::Handle(reinterpret_cast<RawSmi*>(target));
|
|
object_pool_.SetAt(index, smi);
|
|
// No need to flush the instruction cache, since the code is not modified.
|
|
}
|
|
|
|
|
|
const int* JumpPattern::pattern() const {
|
|
// 07: 41 ff a7 imm32 jmpq [reg + off]
|
|
static const int kJumpPattern[kLengthInBytes] =
|
|
{0x41, 0xFF, -1, -1, -1, -1, -1};
|
|
return kJumpPattern;
|
|
}
|
|
|
|
|
|
void ShortCallPattern::SetTargetAddress(uword target) const {
|
|
ASSERT(IsValid());
|
|
*reinterpret_cast<uint32_t*>(start() + 1) = target - start() - kLengthInBytes;
|
|
CPU::FlushICache(start() + 1, kWordSize);
|
|
}
|
|
|
|
|
|
const int* ShortCallPattern::pattern() const {
|
|
static const int kCallPattern[kLengthInBytes] = {0xE8, -1, -1, -1, -1};
|
|
return kCallPattern;
|
|
}
|
|
|
|
} // namespace dart
|
|
|
|
#endif // defined TARGET_ARCH_X64
|