Zachary Anderson
a1bcf051d8
R=johnmccutchan@google.com Review URL: https://codereview.chromium.org/2481873005 .
140 lines
3.4 KiB
C++
140 lines
3.4 KiB
C++
// Copyright (c) 2016, 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" // NOLINT
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#if defined(TARGET_ARCH_DBC)
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#include "vm/assembler.h"
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#include "vm/cpu.h"
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#include "vm/longjump.h"
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#include "vm/runtime_entry.h"
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#include "vm/simulator.h"
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#include "vm/stack_frame.h"
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#include "vm/stub_code.h"
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namespace dart {
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DECLARE_FLAG(bool, check_code_pointer);
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DECLARE_FLAG(bool, inline_alloc);
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void Assembler::InitializeMemoryWithBreakpoints(uword data, intptr_t length) {
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const uword end = data + length;
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while (data < end) {
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*reinterpret_cast<int32_t*>(data) = Bytecode::kTrap;
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data += sizeof(int32_t);
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}
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}
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#define DEFINE_EMIT(Name, Signature, Fmt0, Fmt1, Fmt2) \
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void Assembler::Name(PARAMS_##Signature) { \
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Emit(Bytecode::FENCODE_##Signature(Bytecode::k##Name ENCODE_##Signature)); \
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}
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#define PARAMS_0
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#define PARAMS_A_D uintptr_t ra, uintptr_t rd
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#define PARAMS_D uintptr_t rd
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#define PARAMS_A_B_C uintptr_t ra, uintptr_t rb, uintptr_t rc
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#define PARAMS_A uintptr_t ra
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#define PARAMS_T intptr_t x
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#define PARAMS_A_X uintptr_t ra, intptr_t x
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#define PARAMS_X intptr_t x
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#define ENCODE_0
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#define ENCODE_A_D , ra, rd
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#define ENCODE_D , 0, rd
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#define ENCODE_A_B_C , ra, rb, rc
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#define ENCODE_A , ra, 0
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#define ENCODE_T , x
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#define ENCODE_A_X , ra, x
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#define ENCODE_X , 0, x
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#define FENCODE_0 Encode
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#define FENCODE_A_D Encode
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#define FENCODE_D Encode
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#define FENCODE_A_B_C Encode
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#define FENCODE_A Encode
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#define FENCODE_T EncodeSigned
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#define FENCODE_A_X EncodeSigned
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#define FENCODE_X EncodeSigned
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BYTECODES_LIST(DEFINE_EMIT)
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#undef DEFINE_EMIT
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void Assembler::Emit(int32_t value) {
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AssemblerBuffer::EnsureCapacity ensured(&buffer_);
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buffer_.Emit<int32_t>(value);
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}
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const char* Assembler::RegisterName(Register reg) {
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return Thread::Current()->zone()->PrintToString("R%d", reg);
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}
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static int32_t EncodeJump(int32_t relative_pc) {
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return Bytecode::kJump | (relative_pc << 8);
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}
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static int32_t OffsetToPC(int32_t offset) {
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return offset >> 2;
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}
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void Assembler::Jump(Label* label) {
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if (label->IsBound()) {
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Emit(EncodeJump(OffsetToPC(label->Position() - buffer_.Size())));
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} else {
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const intptr_t position = buffer_.Size();
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Emit(label->position_);
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label->LinkTo(position);
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}
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}
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void Assembler::Bind(Label* label) {
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ASSERT(!label->IsBound());
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ASSERT(!label->IsBound());
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intptr_t bound_pc = buffer_.Size();
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while (label->IsLinked()) {
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const int32_t position = label->Position();
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const int32_t next_position = buffer_.Load<int32_t>(position);
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buffer_.Store<int32_t>(position,
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EncodeJump(OffsetToPC(bound_pc - position)));
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label->position_ = next_position;
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}
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label->BindTo(bound_pc);
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}
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void Assembler::Stop(const char* message) {
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// TODO(vegorov) support passing a message to the bytecode.
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Emit(Bytecode::kTrap);
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}
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void Assembler::PushConstant(const Object& obj) {
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PushConstant(AddConstant(obj));
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}
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void Assembler::LoadConstant(uintptr_t ra, const Object& obj) {
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LoadConstant(ra, AddConstant(obj));
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}
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intptr_t Assembler::AddConstant(const Object& obj) {
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return object_pool_wrapper().FindObject(Object::ZoneHandle(obj.raw()));
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_DBC
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