f9a88acbc9
TBR=mvstanton@chromium.org,neis@chromium.org,ahaas@chromium.org Bug: v8:9247 Change-Id: I5433c863a54f3412d73df0d38aba3fdbcfac7ebe Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1627973 Commit-Queue: Yang Guo <yangguo@chromium.org> Auto-Submit: Yang Guo <yangguo@chromium.org> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org> Cr-Commit-Position: refs/heads/master@{#61830}
99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
// Copyright 2017 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_INTERPRETER_BYTECODE_SOURCE_INFO_H_
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#define V8_INTERPRETER_BYTECODE_SOURCE_INFO_H_
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#include "src/common/globals.h"
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namespace v8 {
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namespace internal {
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namespace interpreter {
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// Source code position information.
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class BytecodeSourceInfo final {
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public:
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static const int kUninitializedPosition = -1;
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BytecodeSourceInfo()
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: position_type_(PositionType::kNone),
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source_position_(kUninitializedPosition) {}
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BytecodeSourceInfo(int source_position, bool is_statement)
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: position_type_(is_statement ? PositionType::kStatement
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: PositionType::kExpression),
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source_position_(source_position) {
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DCHECK_GE(source_position, 0);
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}
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// Makes instance into a statement position.
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void MakeStatementPosition(int source_position) {
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// Statement positions can be replaced by other statement
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// positions. For example , "for (x = 0; x < 3; ++x) 7;" has a
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// statement position associated with 7 but no bytecode associated
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// with it. Then Next is emitted after the body and has
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// statement position and overrides the existing one.
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position_type_ = PositionType::kStatement;
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source_position_ = source_position;
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}
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// Makes instance into an expression position. Instance should not
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// be a statement position otherwise it could be lost and impair the
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// debugging experience.
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void MakeExpressionPosition(int source_position) {
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DCHECK(!is_statement());
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position_type_ = PositionType::kExpression;
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source_position_ = source_position;
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}
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// Forces an instance into an expression position.
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void ForceExpressionPosition(int source_position) {
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position_type_ = PositionType::kExpression;
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source_position_ = source_position;
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}
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int source_position() const {
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DCHECK(is_valid());
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return source_position_;
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}
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bool is_statement() const {
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return position_type_ == PositionType::kStatement;
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}
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bool is_expression() const {
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return position_type_ == PositionType::kExpression;
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}
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bool is_valid() const { return position_type_ != PositionType::kNone; }
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void set_invalid() {
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position_type_ = PositionType::kNone;
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source_position_ = kUninitializedPosition;
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}
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bool operator==(const BytecodeSourceInfo& other) const {
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return position_type_ == other.position_type_ &&
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source_position_ == other.source_position_;
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}
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bool operator!=(const BytecodeSourceInfo& other) const {
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return position_type_ != other.position_type_ ||
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source_position_ != other.source_position_;
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}
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private:
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enum class PositionType : uint8_t { kNone, kExpression, kStatement };
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PositionType position_type_;
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int source_position_;
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};
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V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
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const BytecodeSourceInfo& info);
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} // namespace interpreter
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} // namespace internal
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} // namespace v8
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#endif // V8_INTERPRETER_BYTECODE_SOURCE_INFO_H_
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