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/*
* Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CodeOrigin_h
#define CodeOrigin_h
#include "CodeBlockHash.h"
#include "CodeSpecializationKind.h"
#include "ValueRecovery.h"
#include "WriteBarrier.h"
#include <wtf/BitVector.h>
#include <wtf/StdLibExtras.h>
#include <wtf/Vector.h>
namespace JSC {
struct InlineCallFrame;
class ExecutableBase;
class JSFunction;
struct CodeOrigin {
static const unsigned maximumBytecodeIndex = (1u << 29) - 1;
// Bytecode offset that you'd use to re-execute this instruction.
unsigned bytecodeIndex : 29;
// Bytecode offset corresponding to the opcode that gives the result (needed to handle
// op_call/op_call_put_result and op_method_check/op_get_by_id).
unsigned valueProfileOffset : 3;
InlineCallFrame* inlineCallFrame;
CodeOrigin()
: bytecodeIndex(maximumBytecodeIndex)
, valueProfileOffset(0)
, inlineCallFrame(0)
{
}
explicit CodeOrigin(unsigned bytecodeIndex, InlineCallFrame* inlineCallFrame = 0, unsigned valueProfileOffset = 0)
: bytecodeIndex(bytecodeIndex)
, valueProfileOffset(valueProfileOffset)
, inlineCallFrame(inlineCallFrame)
{
ASSERT(bytecodeIndex <= maximumBytecodeIndex);
ASSERT(valueProfileOffset < (1u << 3));
}
bool isSet() const { return bytecodeIndex != maximumBytecodeIndex; }
unsigned bytecodeIndexForValueProfile() const
{
return bytecodeIndex + valueProfileOffset;
}
// The inline depth is the depth of the inline stack, so 1 = not inlined,
// 2 = inlined one deep, etc.
unsigned inlineDepth() const;
// If the code origin corresponds to inlined code, gives you the heap object that
// would have owned the code if it had not been inlined. Otherwise returns 0.
ExecutableBase* codeOriginOwner() const;
static unsigned inlineDepthForCallFrame(InlineCallFrame*);
bool operator==(const CodeOrigin& other) const;
bool operator!=(const CodeOrigin& other) const { return !(*this == other); }
// Get the inline stack. This is slow, and is intended for debugging only.
Vector<CodeOrigin> inlineStack() const;
};
struct InlineCallFrame {
Vector<ValueRecovery> arguments;
WriteBarrier<ExecutableBase> executable;
WriteBarrier<JSFunction> callee;
CodeOrigin caller;
BitVector capturedVars; // Indexed by the machine call frame's variable numbering.
unsigned stackOffset : 31;
bool isCall : 1;
CodeSpecializationKind specializationKind() const { return specializationFromIsCall(isCall); }
CodeBlockHash hash() const;
};
struct CodeOriginAtCallReturnOffset {
CodeOrigin codeOrigin;
unsigned callReturnOffset;
};
inline bool CodeOrigin::operator==(const CodeOrigin& other) const
{
return bytecodeIndex == other.bytecodeIndex
&& inlineCallFrame == other.inlineCallFrame;
}
inline unsigned getCallReturnOffsetForCodeOrigin(CodeOriginAtCallReturnOffset* data)
{
return data->callReturnOffset;
}
inline ExecutableBase* CodeOrigin::codeOriginOwner() const
{
if (!inlineCallFrame)
return 0;
return inlineCallFrame->executable.get();
}
} // namespace JSC
#endif // CodeOrigin_h
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