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Bug 1123237 - Part 6. A new API to get backtrace without allocating memory in profiler. r=mstange

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Based on patch from Ting-Yuan Huang <laszio.bugzilla@gmail.com>
This commit is contained in:
Kan-Ru Chen 2015-05-08 11:21:21 +08:00
parent 22e4adba22
commit b4ef7f369b
4 changed files with 35 additions and 0 deletions
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27
tools/profiler/core/platform.cpp
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@ -1027,6 +1027,33 @@ void mozilla_sampler_free_backtrace(ProfilerBacktrace* aBacktrace)
delete aBacktrace;
}
// Fill the output buffer with the following pattern:
// "Lable 1" "\0" "Label 2" "\0" ... "Label N" "\0" "\0"
// TODO: use the unwinder instead of pseudo stack.
void mozilla_sampler_get_backtrace_noalloc(char *output, size_t outputSize)
{
MOZ_ASSERT(outputSize >= 2);
char *bound = output + outputSize - 2;
output[0] = output[1] = '\0';
PseudoStack *pseudoStack = tlsPseudoStack.get();
if (!pseudoStack) {
return;
}
volatile StackEntry *pseudoFrames = pseudoStack->mStack;
uint32_t pseudoCount = pseudoStack->stackSize();
for (uint32_t i = 0; i < pseudoCount; i++) {
size_t len = strlen(pseudoFrames[i].label());
if (output + len >= bound)
break;
strcpy(output, pseudoFrames[i].label());
output += len;
*output++ = '\0';
*output = '\0';
}
}
void mozilla_sampler_tracing(const char* aCategory, const char* aInfo,
TracingMetadata aMetaData)
{

1
tools/profiler/public/GeckoProfiler.h
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@ -149,6 +149,7 @@ static inline void profiler_resume() {}
// Immediately capture the current thread's call stack and return it
static inline ProfilerBacktrace* profiler_get_backtrace() { return nullptr; }
static inline void profiler_get_backtrace_noalloc(char *output, size_t outputSize) { return; }
// Free a ProfilerBacktrace returned by profiler_get_backtrace()
static inline void profiler_free_backtrace(ProfilerBacktrace* aBacktrace) {}

1
tools/profiler/public/GeckoProfilerFunc.h
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@ -48,6 +48,7 @@ void mozilla_sampler_resume();
ProfilerBacktrace* mozilla_sampler_get_backtrace();
void mozilla_sampler_free_backtrace(ProfilerBacktrace* aBacktrace);
void mozilla_sampler_get_backtrace_noalloc(char *output, size_t outputSize);
bool mozilla_sampler_is_active();

6
tools/profiler/public/GeckoProfilerImpl.h
View File

@ -121,6 +121,12 @@ void profiler_free_backtrace(ProfilerBacktrace* aBacktrace)
mozilla_sampler_free_backtrace(aBacktrace);
}
static inline
void profiler_get_backtrace_noalloc(char *output, size_t outputSize)
{
return mozilla_sampler_get_backtrace_noalloc(output, outputSize);
}
static inline
bool profiler_is_active()
{