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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_SOURCE_POSITION_H_
#define V8_SOURCE_POSITION_H_
#include <ostream>
#include "src/flags.h"
#include "src/globals.h"
#include "src/handles.h"
#include "src/utils.h"
namespace v8 {
namespace internal {
class Code;
class CompilationInfo;
class Script;
class SharedFunctionInfo;
struct SourcePositionInfo;
// SourcePosition stores
// - script_offset (31 bit non-negative int or kNoSourcePosition)
// - inlining_id (16 bit non-negative int or kNotInlined).
//
// A defined inlining_id refers to positions in
// CompilationInfo::inlined_functions or
// DeoptimizationInputData::InliningPositions, depending on the compilation
// stage.
class SourcePosition final {
public:
explicit SourcePosition(int script_offset, int inlining_id = kNotInlined)
: value_(0) {
SetScriptOffset(script_offset);
SetInliningId(inlining_id);
}
static SourcePosition Unknown() { return SourcePosition(kNoSourcePosition); }
bool IsKnown() const {
return ScriptOffset() != kNoSourcePosition || InliningId() != kNotInlined;
}
bool isInlined() const { return InliningId() != kNotInlined; }
// Assumes that the code object is optimized
std::vector<SourcePositionInfo> InliningStack(Handle<Code> code) const;
std::vector<SourcePositionInfo> InliningStack(CompilationInfo* cinfo) const;
void Print(std::ostream& out, Code* code) const;
int ScriptOffset() const { return ScriptOffsetField::decode(value_) - 1; }
int InliningId() const { return InliningIdField::decode(value_) - 1; }
void SetScriptOffset(int script_offset) {
DCHECK(script_offset <= ScriptOffsetField::kMax - 2);
DCHECK(script_offset >= kNoSourcePosition);
value_ = ScriptOffsetField::update(value_, script_offset + 1);
}
void SetInliningId(int inlining_id) {
DCHECK(inlining_id <= InliningIdField::kMax - 2);
DCHECK(inlining_id >= kNotInlined);
value_ = InliningIdField::update(value_, inlining_id + 1);
}
static const int kNotInlined = -1;
STATIC_ASSERT(kNoSourcePosition == -1);
int64_t raw() const { return static_cast<int64_t>(value_); }
static SourcePosition FromRaw(int64_t raw) {
SourcePosition position = Unknown();
DCHECK_GE(raw, 0);
position.value_ = static_cast<uint64_t>(raw);
return position;
}
private:
void Print(std::ostream& out, SharedFunctionInfo* function) const;
// InliningId is in the high bits for better compression in
// SourcePositionTable.
typedef BitField64<int, 0, 31> ScriptOffsetField;
typedef BitField64<int, 31, 16> InliningIdField;
// Leaving the highest bit untouched to allow for signed conversion.
uint64_t value_;
};
inline bool operator==(const SourcePosition& lhs, const SourcePosition& rhs) {
return lhs.raw() == rhs.raw();
}
inline bool operator!=(const SourcePosition& lhs, const SourcePosition& rhs) {
return !(lhs == rhs);
}
struct InliningPosition {
// position of the inlined call
SourcePosition position = SourcePosition::Unknown();
// references position in DeoptimizationInputData::literals()
int inlined_function_id;
};
struct SourcePositionInfo {
SourcePositionInfo(SourcePosition pos, Handle<SharedFunctionInfo> f);
SourcePosition position;
Handle<SharedFunctionInfo> function;
int line = -1;
int column = -1;
};
std::ostream& operator<<(std::ostream& out, const SourcePosition& pos);
std::ostream& operator<<(std::ostream& out, const SourcePositionInfo& pos);
std::ostream& operator<<(std::ostream& out,
const std::vector<SourcePositionInfo>& stack);
} // namespace internal
} // namespace v8
#endif // V8_SOURCE_POSITION_H_
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