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/*
* Copyright (C) 2013-2024 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.
*/
#pragma once
#include "BytecodeIndex.h"
#include "CalleeBits.h"
#include "LineColumn.h"
#include "SourceID.h"
#include "WasmIndexOrName.h"
#include <wtf/Function.h>
#include <wtf/Indenter.h>
#include <wtf/IterationStatus.h>
#include <wtf/text/WTFString.h>
namespace JSC {
struct EntryFrame;
struct InlineCallFrame;
class CallFrame;
class CodeBlock;
class CodeOrigin;
class JSCell;
class JSFunction;
class ClonedArguments;
class Register;
class RegisterAtOffsetList;
class StackVisitor {
public:
class Frame {
public:
enum CodeType {
Global,
Eval,
Function,
Module,
Native,
Wasm
};
size_t index() const { return m_index; }
size_t argumentCountIncludingThis() const { return m_argumentCountIncludingThis; }
bool callerIsEntryFrame() const { return m_callerIsEntryFrame; }
CallFrame* callerFrame() const { return m_callerFrame; }
EntryFrame* entryFrame() const { return m_entryFrame; }
CalleeBits callee() const { return m_callee; }
CodeBlock* codeBlock() const { return m_codeBlock; }
BytecodeIndex bytecodeIndex() const { return m_bytecodeIndex; }
InlineCallFrame* inlineCallFrame() const {
#if ENABLE(DFG_JIT)
return m_inlineDFGCallFrame;
#else
return nullptr;
#endif
}
void* returnPC() const { return m_returnPC; }
bool isNativeFrame() const { return !codeBlock() && !isNativeCalleeFrame(); }
bool isInlinedDFGFrame() const { return !isNativeCalleeFrame() && !!inlineCallFrame(); }
bool isNativeCalleeFrame() const { return m_callee.isNativeCallee(); }
Wasm::IndexOrName const wasmFunctionIndexOrName()
{
ASSERT(isNativeCalleeFrame());
return m_wasmFunctionIndexOrName;
}
JS_EXPORT_PRIVATE String functionName() const;
JS_EXPORT_PRIVATE String sourceURL() const;
JS_EXPORT_PRIVATE String preRedirectURL() const;
JS_EXPORT_PRIVATE String toString() const;
JS_EXPORT_PRIVATE SourceID sourceID();
CodeType codeType() const;
bool hasLineAndColumnInfo() const;
JS_EXPORT_PRIVATE LineColumn computeLineAndColumn() const;
#if ENABLE(ASSEMBLER)
std::optional<RegisterAtOffsetList> calleeSaveRegistersForUnwinding();
#endif
ClonedArguments* createArguments(VM&);
CallFrame* callFrame() const { return m_callFrame; }
JS_EXPORT_PRIVATE bool isImplementationVisibilityPrivate() const;
void dump(PrintStream&, Indenter = Indenter()) const;
void dump(PrintStream&, Indenter, WTF::Function<void(PrintStream&)> prefix) const;
private:
Frame() { }
~Frame() { }
void setToEnd();
#if ENABLE(DFG_JIT)
InlineCallFrame* m_inlineDFGCallFrame { nullptr };
#endif
unsigned m_wasmDistanceFromDeepestInlineFrame { 0 };
CallFrame* m_callFrame { nullptr };
EntryFrame* m_entryFrame { nullptr };
EntryFrame* m_callerEntryFrame { nullptr };
CallFrame* m_callerFrame { nullptr };
CalleeBits m_callee { };
CodeBlock* m_codeBlock { nullptr };
void* m_returnPC { nullptr };
size_t m_index { 0 };
size_t m_argumentCountIncludingThis { 0 };
BytecodeIndex m_bytecodeIndex { };
bool m_callerIsEntryFrame : 1 { false };
bool m_isWasmFrame : 1 { false };
Wasm::IndexOrName m_wasmFunctionIndexOrName { };
friend class StackVisitor;
};
// StackVisitor::visit() expects a Functor that implements the following method:
// IterationStatus operator()(StackVisitor&) const;
enum EmptyEntryFrameAction {
ContinueIfTopEntryFrameIsEmpty,
TerminateIfTopEntryFrameIsEmpty,
};
template <EmptyEntryFrameAction action = ContinueIfTopEntryFrameIsEmpty, typename Functor>
static void visit(CallFrame* startFrame, VM& vm, const Functor& functor, bool skipFirstFrame = false)
{
StackVisitor visitor(startFrame, vm, skipFirstFrame);
if (action == TerminateIfTopEntryFrameIsEmpty && visitor.topEntryFrameIsEmpty())
return;
while (visitor->callFrame()) {
IterationStatus status = functor(visitor);
if (status != IterationStatus::Continue)
break;
visitor.gotoNextFrame();
}
}
Frame& operator*() { return m_frame; }
ALWAYS_INLINE Frame* operator->() { return &m_frame; }
void unwindToMachineCodeBlockFrame();
bool topEntryFrameIsEmpty() const { return m_topEntryFrameIsEmpty; }
private:
JS_EXPORT_PRIVATE StackVisitor(CallFrame* startFrame, VM&, bool skipFirstFrame);
JS_EXPORT_PRIVATE void gotoNextFrame();
void readFrame(CallFrame*);
void readInlinableNativeCalleeFrame(CallFrame*);
void readNonInlinedFrame(CallFrame*, CodeOrigin* = nullptr);
#if ENABLE(DFG_JIT)
void readInlinedFrame(CallFrame*, CodeOrigin*);
#endif
CallFrame* updatePreviousReturnPCIfNecessary(CallFrame*);
Frame m_frame;
void* m_previousReturnPC { nullptr };
bool m_topEntryFrameIsEmpty { false };
};
class CallerFunctor {
public:
CallerFunctor()
: m_hasSkippedFirstFrame(false)
, m_callerFrame(nullptr)
{
}
CallFrame* callerFrame() const { return m_callerFrame; }
IterationStatus operator()(StackVisitor& visitor) const
{
if (!m_hasSkippedFirstFrame) {
m_hasSkippedFirstFrame = true;
return IterationStatus::Continue;
}
m_callerFrame = visitor->callFrame();
return IterationStatus::Done;
}
private:
mutable bool m_hasSkippedFirstFrame;
mutable CallFrame* m_callerFrame;
};
} // namespace JSC
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