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544371c7f2
Refactoring motivation: go/dart-simulated-ffi Change-Id: I219aba2793cfb7d7ea5ecc0a2ab93276c6cbf1e0 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/97325 Reviewed-by: Samir Jindel <sjindel@google.com>
103 lines
3.4 KiB
C++
103 lines
3.4 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/code_patcher.h"
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#include "vm/instructions.h"
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#include "vm/instructions_x64.h"
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#include "vm/constants.h"
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#include "vm/cpu.h"
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#include "vm/object.h"
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namespace dart {
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// [start] is the address of a displacement inside a load instruction
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intptr_t IndexFromPPLoadDisp8(uword start) {
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int8_t offset = *reinterpret_cast<int8_t*>(start);
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return ObjectPool::IndexFromOffset(offset);
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}
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intptr_t IndexFromPPLoadDisp32(uword start) {
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int32_t offset = *reinterpret_cast<int32_t*>(start);
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return ObjectPool::IndexFromOffset(offset);
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}
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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 = IndexFromPPLoadDisp32(pc + 3);
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const ObjectPool& pool = ObjectPool::Handle(code.object_pool());
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if (!pool.IsNull()) {
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if (pool.TypeAt(index) == ObjectPool::EntryType::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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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.IsNull()) {
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if (pool.TypeAt(index) == ObjectPool::EntryType::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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}
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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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intptr_t TypeTestingStubCallPattern::GetSubtypeTestCachePoolIndex() {
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static int16_t pattern_disp8[] = {
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0x4d, 0x8b, 0x4f, -1, // movq R9, [PP + offset]
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0xff, 0x53, 0x07, // callq [RBX + 0x7]
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};
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static int16_t pattern_disp32[] = {
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0x4d, 0x8b, 0x8f, -1, -1, -1, -1, // movq R9, [PP + offset]
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0xff, 0x53, 0x07, // callq [RBX + 0x7]
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};
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if (MatchesPattern(pc_, pattern_disp8, ARRAY_SIZE(pattern_disp8))) {
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return IndexFromPPLoadDisp8(pc_ - 4);
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} else if (MatchesPattern(pc_, pattern_disp32, ARRAY_SIZE(pattern_disp32))) {
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return IndexFromPPLoadDisp32(pc_ - 7);
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} else {
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FATAL1("Failed to decode at %" Px, pc_);
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}
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_X64
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