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121 lines
2.8 KiB
121 lines
2.8 KiB
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_COMPILER_UTILS_LABEL_H_
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#define ART_COMPILER_UTILS_LABEL_H_
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#include <android-base/logging.h>
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#include <android-base/macros.h>
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namespace art {
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class Assembler;
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class AssemblerBuffer;
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class AssemblerFixup;
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namespace arm64 {
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class Arm64Assembler;
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} // namespace arm64
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namespace x86 {
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class X86Assembler;
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class NearLabel;
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} // namespace x86
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namespace x86_64 {
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class X86_64Assembler;
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class NearLabel;
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} // namespace x86_64
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class ExternalLabel {
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public:
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ExternalLabel(const char* name_in, uintptr_t address_in)
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: name_(name_in), address_(address_in) {
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DCHECK(name_in != nullptr);
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}
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const char* name() const { return name_; }
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uintptr_t address() const {
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return address_;
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}
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private:
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const char* name_;
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const uintptr_t address_;
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};
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class Label {
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public:
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Label() : position_(0) {}
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Label(Label&& src)
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: position_(src.position_) {
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// We must unlink/unbind the src label when moving; if not, calling the destructor on
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// the src label would fail.
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src.position_ = 0;
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}
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~Label() {
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// Assert if label is being destroyed with unresolved branches pending.
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CHECK(!IsLinked());
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}
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// Returns the position for bound and linked labels. Cannot be used
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// for unused labels.
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int Position() const {
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CHECK(!IsUnused());
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return IsBound() ? -position_ - sizeof(void*) : position_ - sizeof(void*);
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}
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int LinkPosition() const {
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CHECK(IsLinked());
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return position_ - sizeof(void*);
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}
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bool IsBound() const { return position_ < 0; }
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bool IsUnused() const { return position_ == 0; }
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bool IsLinked() const { return position_ > 0; }
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private:
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int position_;
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void Reinitialize() {
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position_ = 0;
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}
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void BindTo(int position) {
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CHECK(!IsBound());
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position_ = -position - sizeof(void*);
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CHECK(IsBound());
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}
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void LinkTo(int position) {
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CHECK(!IsBound());
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position_ = position + sizeof(void*);
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CHECK(IsLinked());
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}
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friend class arm64::Arm64Assembler;
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friend class x86::X86Assembler;
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friend class x86::NearLabel;
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friend class x86_64::X86_64Assembler;
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friend class x86_64::NearLabel;
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DISALLOW_COPY_AND_ASSIGN(Label);
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};
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} // namespace art
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#endif // ART_COMPILER_UTILS_LABEL_H_
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