本文整理汇总了C++中ThreadProfile::GetPseudoStack方法的典型用法代码示例。如果您正苦于以下问题:C++ ThreadProfile::GetPseudoStack方法的具体用法?C++ ThreadProfile::GetPseudoStack怎么用?C++ ThreadProfile::GetPseudoStack使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类ThreadProfile
的用法示例。
在下文中一共展示了ThreadProfile::GetPseudoStack方法的2个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: doNativeBacktrace
void TableTicker::doNativeBacktrace(ThreadProfile &aProfile, TickSample* aSample)
{
void *pc_array[1000];
void *sp_array[1000];
PCArray array = {
pc_array,
sp_array,
mozilla::ArrayLength(pc_array),
0
};
const mcontext_t *mcontext = &reinterpret_cast<ucontext_t *>(aSample->context)->uc_mcontext;
mcontext_t savedContext;
PseudoStack *pseudoStack = aProfile.GetPseudoStack();
array.count = 0;
// The pseudostack contains an "EnterJIT" frame whenever we enter
// JIT code with profiling enabled; the stack pointer value points
// the saved registers. We use this to unwind resume unwinding
// after encounting JIT code.
for (uint32_t i = pseudoStack->stackSize(); i > 0; --i) {
// The pseudostack grows towards higher indices, so we iterate
// backwards (from callee to caller).
volatile StackEntry &entry = pseudoStack->mStack[i - 1];
if (!entry.js() && strcmp(entry.label(), "EnterJIT") == 0) {
// Found JIT entry frame. Unwind up to that point (i.e., force
// the stack walk to stop before the block of saved registers;
// note that it yields nondecreasing stack pointers), then restore
// the saved state.
uint32_t *vSP = reinterpret_cast<uint32_t*>(entry.stackAddress());
array.count += EHABIStackWalk(*mcontext,
/* stackBase = */ vSP,
sp_array + array.count,
pc_array + array.count,
array.size - array.count);
memset(&savedContext, 0, sizeof(savedContext));
// See also: struct EnterJITStack in js/src/jit/arm/Trampoline-arm.cpp
savedContext.arm_r4 = *vSP++;
savedContext.arm_r5 = *vSP++;
savedContext.arm_r6 = *vSP++;
savedContext.arm_r7 = *vSP++;
savedContext.arm_r8 = *vSP++;
savedContext.arm_r9 = *vSP++;
savedContext.arm_r10 = *vSP++;
savedContext.arm_fp = *vSP++;
savedContext.arm_lr = *vSP++;
savedContext.arm_sp = reinterpret_cast<uint32_t>(vSP);
savedContext.arm_pc = savedContext.arm_lr;
mcontext = &savedContext;
}
}
// Now unwind whatever's left (starting from either the last EnterJIT
// frame or, if no EnterJIT was found, the original registers).
array.count += EHABIStackWalk(*mcontext,
aProfile.GetStackTop(),
sp_array + array.count,
pc_array + array.count,
array.size - array.count);
mergeNativeBacktrace(aProfile, array);
}
示例2: mergeStacksIntoProfile
static
void mergeStacksIntoProfile(ThreadProfile& aProfile, TickSample* aSample, NativeStack& aNativeStack)
{
PseudoStack* pseudoStack = aProfile.GetPseudoStack();
volatile StackEntry *pseudoFrames = pseudoStack->mStack;
uint32_t pseudoCount = pseudoStack->stackSize();
// Make a copy of the JS stack into a JSFrame array. This is necessary since,
// like the native stack, the JS stack is iterated youngest-to-oldest and we
// need to iterate oldest-to-youngest when adding entries to aProfile.
// Synchronous sampling reports an invalid buffer generation to
// ProfilingFrameIterator to avoid incorrectly resetting the generation of
// sampled JIT entries inside the JS engine. See note below concerning 'J'
// entries.
uint32_t startBufferGen;
if (aSample->isSamplingCurrentThread) {
startBufferGen = UINT32_MAX;
} else {
startBufferGen = aProfile.bufferGeneration();
}
uint32_t jsCount = 0;
#ifndef SPS_STANDALONE
JS::ProfilingFrameIterator::Frame jsFrames[1000];
// Only walk jit stack if profiling frame iterator is turned on.
if (pseudoStack->mRuntime && JS::IsProfilingEnabledForRuntime(pseudoStack->mRuntime)) {
AutoWalkJSStack autoWalkJSStack;
const uint32_t maxFrames = mozilla::ArrayLength(jsFrames);
if (aSample && autoWalkJSStack.walkAllowed) {
JS::ProfilingFrameIterator::RegisterState registerState;
registerState.pc = aSample->pc;
registerState.sp = aSample->sp;
#ifdef ENABLE_ARM_LR_SAVING
registerState.lr = aSample->lr;
#endif
JS::ProfilingFrameIterator jsIter(pseudoStack->mRuntime,
registerState,
startBufferGen);
for (; jsCount < maxFrames && !jsIter.done(); ++jsIter) {
// See note below regarding 'J' entries.
if (aSample->isSamplingCurrentThread || jsIter.isAsmJS()) {
uint32_t extracted = jsIter.extractStack(jsFrames, jsCount, maxFrames);
jsCount += extracted;
if (jsCount == maxFrames)
break;
} else {
mozilla::Maybe<JS::ProfilingFrameIterator::Frame> frame =
jsIter.getPhysicalFrameWithoutLabel();
if (frame.isSome())
jsFrames[jsCount++] = frame.value();
}
}
}
}
#endif
// Start the sample with a root entry.
aProfile.addTag(ProfileEntry('s', "(root)"));
// While the pseudo-stack array is ordered oldest-to-youngest, the JS and
// native arrays are ordered youngest-to-oldest. We must add frames to
// aProfile oldest-to-youngest. Thus, iterate over the pseudo-stack forwards
// and JS and native arrays backwards. Note: this means the terminating
// condition jsIndex and nativeIndex is being < 0.
uint32_t pseudoIndex = 0;
int32_t jsIndex = jsCount - 1;
int32_t nativeIndex = aNativeStack.count - 1;
uint8_t *lastPseudoCppStackAddr = nullptr;
// Iterate as long as there is at least one frame remaining.
while (pseudoIndex != pseudoCount || jsIndex >= 0 || nativeIndex >= 0) {
// There are 1 to 3 frames available. Find and add the oldest.
uint8_t *pseudoStackAddr = nullptr;
uint8_t *jsStackAddr = nullptr;
uint8_t *nativeStackAddr = nullptr;
if (pseudoIndex != pseudoCount) {
volatile StackEntry &pseudoFrame = pseudoFrames[pseudoIndex];
if (pseudoFrame.isCpp())
lastPseudoCppStackAddr = (uint8_t *) pseudoFrame.stackAddress();
#ifndef SPS_STANDALONE
// Skip any pseudo-stack JS frames which are marked isOSR
// Pseudostack frames are marked isOSR when the JS interpreter
// enters a jit frame on a loop edge (via on-stack-replacement,
// or OSR). To avoid both the pseudoframe and jit frame being
// recorded (and showing up twice), the interpreter marks the
// interpreter pseudostack entry with the OSR flag to ensure that
// it doesn't get counted.
if (pseudoFrame.isJs() && pseudoFrame.isOSR()) {
pseudoIndex++;
continue;
}
#endif
//.........这里部分代码省略.........