void StackVisitor::readFrame(CallFrame* callFrame)
{
if (!callFrame) {
m_frame.setToEnd();
return;
}
if (callFrame->isAnyWasmCallee()) {
readNonInlinedFrame(callFrame);
return;
}
#if !ENABLE(DFG_JIT)
readNonInlinedFrame(callFrame);
#else // !ENABLE(DFG_JIT)
// If the frame doesn't have a code block, then it's not a DFG frame.
// Hence, we're not at an inlined frame.
CodeBlock* codeBlock = callFrame->codeBlock();
if (!codeBlock) {
readNonInlinedFrame(callFrame);
return;
}
// If the code block does not have any code origins, then there's no
// inlining. Hence, we're not at an inlined frame.
if (!codeBlock->hasCodeOrigins()) {
readNonInlinedFrame(callFrame);
return;
}
CallSiteIndex index = callFrame->callSiteIndex();
ASSERT(codeBlock->canGetCodeOrigin(index));
if (!codeBlock->canGetCodeOrigin(index)) {
// See assertion above. In release builds, we try to protect ourselves
// from crashing even though stack walking will be goofed up.
m_frame.setToEnd();
return;
}
CodeOrigin codeOrigin = codeBlock->codeOrigin(index);
if (!codeOrigin.inlineCallFrame) {
readNonInlinedFrame(callFrame, &codeOrigin);
return;
}
readInlinedFrame(callFrame, &codeOrigin);
#endif // !ENABLE(DFG_JIT)
}
void StackVisitor::readInlinedFrame(CallFrame* callFrame, CodeOrigin* codeOrigin)
{
ASSERT(codeOrigin);
int frameOffset = inlinedFrameOffset(codeOrigin);
bool isInlined = !!frameOffset;
if (isInlined) {
InlineCallFrame* inlineCallFrame = codeOrigin->inlineCallFrame;
m_frame.m_callFrame = callFrame;
m_frame.m_inlineCallFrame = inlineCallFrame;
if (inlineCallFrame->argumentCountRegister.isValid())
m_frame.m_argumentCountIncludingThis = callFrame->r(inlineCallFrame->argumentCountRegister.offset()).unboxedInt32();
else
m_frame.m_argumentCountIncludingThis = inlineCallFrame->arguments.size();
m_frame.m_codeBlock = inlineCallFrame->baselineCodeBlock();
m_frame.m_bytecodeOffset = codeOrigin->bytecodeIndex;
JSFunction* callee = inlineCallFrame->calleeForCallFrame(callFrame);
m_frame.m_callee = callee;
ASSERT(m_frame.callee());
// The callerFrame just needs to be non-null to indicate that we
// haven't reached the last frame yet. Setting it to the root
// frame (i.e. the callFrame that this inlined frame is called from)
// would work just fine.
m_frame.m_callerFrame = callFrame;
return;
}
readNonInlinedFrame(callFrame, codeOrigin);
}
void StackVisitor::unwindToMachineCodeBlockFrame()
{
#if ENABLE(DFG_JIT)
if (m_frame.isInlinedFrame()) {
CodeOrigin codeOrigin = m_frame.inlineCallFrame()->directCaller;
while (codeOrigin.inlineCallFrame)
codeOrigin = codeOrigin.inlineCallFrame->directCaller;
readNonInlinedFrame(m_frame.callFrame(), &codeOrigin);
}
#endif
}
void StackIterator::readInlinedFrame(CallFrame* callFrame, CodeOrigin* codeOrigin)
{
ASSERT(codeOrigin);
ASSERT(!callFrame->hasHostCallFrameFlag());
unsigned frameOffset = inlinedFrameOffset(codeOrigin);
bool isInlined = !!frameOffset;
if (isInlined) {
InlineCallFrame* inlineCallFrame = codeOrigin->inlineCallFrame;
m_frame.m_callFrame = callFrame;
m_frame.m_inlineCallFrame = inlineCallFrame;
m_frame.m_argumentCountIncludingThis = inlineCallFrame->arguments.size();
m_frame.m_codeBlock = inlineCallFrame->baselineCodeBlock();
m_frame.m_bytecodeOffset = codeOrigin->bytecodeIndex;
JSFunction* callee = inlineCallFrame->callee.get();
if (callee) {
m_frame.m_scope = callee->scope();
m_frame.m_callee = callee;
} else {
CallFrame* inlinedFrame = callFrame + frameOffset;
m_frame.m_scope = inlinedFrame->scope();
m_frame.m_callee = inlinedFrame->callee();
}
ASSERT(m_frame.scope());
ASSERT(m_frame.callee());
// The callerFrame just needs to be non-null to indicate that we
// haven't reached the last frame yet. Setting it to the root
// frame (i.e. the callFrame that this inlined frame is called from)
// would work just fine.
m_frame.m_callerFrame = callFrame;
return;
}
readNonInlinedFrame(callFrame, codeOrigin);
}