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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef vm_BytecodeLocation_h
#define vm_BytecodeLocation_h
#include "frontend/NameAnalysisTypes.h"
#include "js/TypeDecls.h"
#include "vm/AsyncFunctionResolveKind.h"
#include "vm/BuiltinObjectKind.h"
#include "vm/BytecodeUtil.h"
#include "vm/CheckIsObjectKind.h" // CheckIsObjectKind
#include "vm/FunctionPrefixKind.h" // FunctionPrefixKind
#include "vm/GeneratorResumeKind.h"
#include "vm/StringType.h"
namespace js {
using RawBytecodeLocationOffset = uint32_t;
class PropertyName;
class RegExpObject;
class BytecodeLocationOffset {
RawBytecodeLocationOffset rawOffset_;
public:
explicit BytecodeLocationOffset(RawBytecodeLocationOffset offset)
: rawOffset_(offset) {}
RawBytecodeLocationOffset rawOffset() const { return rawOffset_; }
};
using RawBytecode = jsbytecode*;
// A immutable representation of a program location
//
class BytecodeLocation {
RawBytecode rawBytecode_;
#ifdef DEBUG
const JSScript* debugOnlyScript_;
#endif
// Construct a new BytecodeLocation, while borrowing scriptIdentity
// from some other BytecodeLocation.
BytecodeLocation(const BytecodeLocation& loc, RawBytecode pc)
: rawBytecode_(pc)
#ifdef DEBUG
,
debugOnlyScript_(loc.debugOnlyScript_)
#endif
{
MOZ_ASSERT(isValid());
}
public:
// Disallow the creation of an uninitialized location.
BytecodeLocation() = delete;
BytecodeLocation(const JSScript* script, RawBytecode pc)
: rawBytecode_(pc)
#ifdef DEBUG
,
debugOnlyScript_(script)
#endif
{
MOZ_ASSERT(isValid());
}
RawBytecode toRawBytecode() const { return rawBytecode_; }
#ifdef DEBUG
// Return true if this bytecode location is valid for the given script.
// This includes the location 1-past the end of the bytecode.
bool isValid(const JSScript* script) const;
// Return true if this bytecode location is within the bounds of the
// bytecode for a given script.
bool isInBounds(const JSScript* script) const;
const JSScript* getDebugOnlyScript() const;
#endif
inline uint32_t bytecodeToOffset(const JSScript* script) const;
inline uint32_t tableSwitchCaseOffset(const JSScript* script,
uint32_t caseIndex) const;
inline uint32_t getJumpTargetOffset(const JSScript* script) const;
inline uint32_t getTableSwitchDefaultOffset(const JSScript* script) const;
inline BytecodeLocation getTableSwitchDefaultTarget() const;
inline BytecodeLocation getTableSwitchCaseTarget(const JSScript* script,
uint32_t caseIndex) const;
inline uint32_t useCount() const;
inline uint32_t defCount() const;
int32_t jumpOffset() const { return GET_JUMP_OFFSET(rawBytecode_); }
inline JSAtom* getAtom(const JSScript* script) const;
inline PropertyName* getPropertyName(const JSScript* script) const;
inline JS::BigInt* getBigInt(const JSScript* script) const;
inline JSObject* getObject(const JSScript* script) const;
inline JSFunction* getFunction(const JSScript* script) const;
inline js::RegExpObject* getRegExp(const JSScript* script) const;
inline js::Scope* getScope(const JSScript* script) const;
uint32_t getSymbolIndex() const {
MOZ_ASSERT(is(JSOp::Symbol));
return GET_UINT8(rawBytecode_);
}
inline Scope* innermostScope(const JSScript* script) const;
#ifdef DEBUG
bool hasSameScript(const BytecodeLocation& other) const {
return debugOnlyScript_ == other.debugOnlyScript_;
}
#endif
// Overloaded operators
bool operator==(const BytecodeLocation& other) const {
MOZ_ASSERT(this->debugOnlyScript_ == other.debugOnlyScript_);
return rawBytecode_ == other.rawBytecode_;
}
bool operator!=(const BytecodeLocation& other) const {
return !(other == *this);
}
bool operator<(const BytecodeLocation& other) const {
MOZ_ASSERT(this->debugOnlyScript_ == other.debugOnlyScript_);
return rawBytecode_ < other.rawBytecode_;
}
// It is traditional to represent the rest of the relational operators
// using operator<, so we don't need to assert for these.
bool operator>(const BytecodeLocation& other) const { return other < *this; }
bool operator<=(const BytecodeLocation& other) const {
return !(other < *this);
}
bool operator>=(const BytecodeLocation& other) const {
return !(*this < other);
}
// Return the next bytecode
BytecodeLocation next() const {
return BytecodeLocation(*this,
rawBytecode_ + GetBytecodeLength(rawBytecode_));
}
// Add an offset.
BytecodeLocation operator+(const BytecodeLocationOffset& offset) {
return BytecodeLocation(*this, rawBytecode_ + offset.rawOffset());
}
// Identity Checks
bool is(JSOp op) const {
MOZ_ASSERT(isInBounds());
return getOp() == op;
}
// Accessors:
uint32_t length() const { return GetBytecodeLength(rawBytecode_); }
bool isJumpTarget() const { return BytecodeIsJumpTarget(getOp()); }
bool isJump() const { return IsJumpOpcode(getOp()); }
bool isBackedge() const { return IsBackedgePC(rawBytecode_); }
bool isBackedgeForLoophead(BytecodeLocation loopHead) const {
return IsBackedgeForLoopHead(rawBytecode_, loopHead.rawBytecode_);
}
bool opHasIC() const { return BytecodeOpHasIC(getOp()); }
bool fallsThrough() const { return BytecodeFallsThrough(getOp()); }
uint32_t icIndex() const { return GET_ICINDEX(rawBytecode_); }
uint32_t local() const { return GET_LOCALNO(rawBytecode_); }
uint16_t arg() const { return GET_ARGNO(rawBytecode_); }
bool isEqualityOp() const { return IsEqualityOp(getOp()); }
bool isStrictEqualityOp() const { return IsStrictEqualityOp(getOp()); }
bool isStrictSetOp() const { return IsStrictSetPC(rawBytecode_); }
bool isNameOp() const { return IsNameOp(getOp()); }
bool isSpreadOp() const { return IsSpreadOp(getOp()); }
bool isInvokeOp() const { return IsInvokeOp(getOp()); }
bool isGetPropOp() const { return IsGetPropOp(getOp()); }
bool isSetPropOp() const { return IsSetPropOp(getOp()); }
AsyncFunctionResolveKind getAsyncFunctionResolveKind() {
return AsyncFunctionResolveKind(GET_UINT8(rawBytecode_));
}
bool resultIsPopped() const {
MOZ_ASSERT(StackDefs(rawBytecode_) == 1);
return BytecodeIsPopped(rawBytecode_);
}
// Accessors:
JSOp getOp() const { return JSOp(*rawBytecode_); }
BytecodeLocation getJumpTarget() const {
MOZ_ASSERT(isJump());
return BytecodeLocation(*this,
rawBytecode_ + GET_JUMP_OFFSET(rawBytecode_));
}
// Return the 'low' parameter to the tableswitch opcode
int32_t getTableSwitchLow() const {
MOZ_ASSERT(is(JSOp::TableSwitch));
return GET_JUMP_OFFSET(rawBytecode_ + JUMP_OFFSET_LEN);
}
// Return the 'high' parameter to the tableswitch opcode
int32_t getTableSwitchHigh() const {
MOZ_ASSERT(is(JSOp::TableSwitch));
return GET_JUMP_OFFSET(rawBytecode_ + (2 * JUMP_OFFSET_LEN));
}
uint32_t getPopCount() const {
MOZ_ASSERT(is(JSOp::PopN));
return GET_UINT16(rawBytecode_);
}
uint32_t getDupAtIndex() const {
MOZ_ASSERT(is(JSOp::DupAt));
return GET_UINT24(rawBytecode_);
}
uint8_t getPickDepth() const {
MOZ_ASSERT(is(JSOp::Pick));
return GET_UINT8(rawBytecode_);
}
uint8_t getUnpickDepth() const {
MOZ_ASSERT(is(JSOp::Unpick));
return GET_UINT8(rawBytecode_);
}
uint32_t getEnvCalleeNumHops() const {
MOZ_ASSERT(is(JSOp::EnvCallee));
return GET_UINT8(rawBytecode_);
}
EnvironmentCoordinate getEnvironmentCoordinate() const {
MOZ_ASSERT(JOF_OPTYPE(getOp()) == JOF_ENVCOORD);
return EnvironmentCoordinate(rawBytecode_);
}
uint32_t getCallArgc() const {
MOZ_ASSERT(JOF_OPTYPE(getOp()) == JOF_ARGC);
return GET_ARGC(rawBytecode_);
}
uint32_t getInitElemArrayIndex() const {
MOZ_ASSERT(is(JSOp::InitElemArray));
uint32_t index = GET_UINT32(rawBytecode_);
MOZ_ASSERT(index <= INT32_MAX,
"the bytecode emitter must never generate JSOp::InitElemArray "
"with an index exceeding int32_t range");
return index;
}
FunctionPrefixKind getFunctionPrefixKind() const {
MOZ_ASSERT(is(JSOp::SetFunName));
return FunctionPrefixKind(GET_UINT8(rawBytecode_));
}
CheckIsObjectKind getCheckIsObjectKind() const {
MOZ_ASSERT(is(JSOp::CheckIsObj));
return CheckIsObjectKind(GET_UINT8(rawBytecode_));
}
BuiltinObjectKind getBuiltinObjectKind() const {
MOZ_ASSERT(is(JSOp::BuiltinObject));
return BuiltinObjectKind(GET_UINT8(rawBytecode_));
}
uint32_t getNewArrayLength() const {
MOZ_ASSERT(is(JSOp::NewArray));
return GET_UINT32(rawBytecode_);
}
int8_t getInt8() const {
MOZ_ASSERT(is(JSOp::Int8));
return GET_INT8(rawBytecode_);
}
uint16_t getUint16() const {
MOZ_ASSERT(is(JSOp::Uint16));
return GET_UINT16(rawBytecode_);
}
uint32_t getUint24() const {
MOZ_ASSERT(is(JSOp::Uint24));
return GET_UINT24(rawBytecode_);
}
int32_t getInt32() const {
MOZ_ASSERT(is(JSOp::Int32));
return GET_INT32(rawBytecode_);
}
uint32_t getResumeIndex() const {
MOZ_ASSERT(is(JSOp::ResumeIndex) || is(JSOp::InitialYield) ||
is(JSOp::Yield) || is(JSOp::Await));
return GET_RESUMEINDEX(rawBytecode_);
}
Value getInlineValue() const {
MOZ_ASSERT(is(JSOp::Double));
return GET_INLINE_VALUE(rawBytecode_);
}
GeneratorResumeKind resumeKind() { return ResumeKindFromPC(rawBytecode_); }
ThrowMsgKind throwMsgKind() {
MOZ_ASSERT(is(JSOp::ThrowMsg));
return static_cast<ThrowMsgKind>(GET_UINT8(rawBytecode_));
}
#ifdef DEBUG
// To ease writing assertions
bool isValid() const { return isValid(debugOnlyScript_); }
bool isInBounds() const { return isInBounds(debugOnlyScript_); }
#endif
};
} // namespace js
#endif