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Bug 1050445 - Part 5: Print stacks. r=mccr8

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--HG--
extra : rebase_source : 6397f4a2021944cc114e871c3d9b8ef0ea2636c8
This commit is contained in:
Eric Rahm 2014-08-13 13:06:07 -07:00
parent dc49a65472
commit 209fcd745a
1 changed files with 79 additions and 0 deletions
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79
xpcom/glue/BlockingResourceBase.cpp
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@ -12,7 +12,10 @@
#include "nsAutoPtr.h"
#ifndef MOZ_CALLSTACK_DISABLED
#include "CodeAddressService.h"
#include "nsHashKeys.h"
#include "nsStackWalk.h"
#include "nsTHashtable.h"
#endif
#include "mozilla/CondVar.h"
@ -58,6 +61,7 @@ void
BlockingResourceBase::GetStackTrace(AcquisitionState& aState)
{
#ifndef MOZ_CALLSTACK_DISABLED
// Skip this function and the calling function.
const uint32_t kSkipFrames = 2;
aState.Clear();
@ -113,6 +117,70 @@ PrintCycle(const BlockingResourceBase::DDT::ResourceAcquisitionArray* aCycle, ns
return maybeImminent;
}
#ifndef MOZ_CALLSTACK_DISABLED
class CodeAddressServiceWriter MOZ_FINAL
{
public:
explicit CodeAddressServiceWriter(nsACString& aOut) : mOut(aOut) {}
void Write(const char* aFmt, ...) const
{
va_list ap;
va_start(ap, aFmt);
const size_t kMaxLength = 4096;
char buffer[kMaxLength];
vsnprintf(buffer, kMaxLength, aFmt, ap);
mOut += buffer;
fprintf(stderr, "%s", buffer);
va_end(ap);
}
private:
nsACString& mOut;
};
struct CodeAddressServiceLock MOZ_FINAL
{
static void Unlock() { }
static void Lock() { }
static bool IsLocked() { return true; }
};
struct CodeAddressServiceStringAlloc MOZ_FINAL
{
static char* copy(const char* aString) { return ::strdup(aString); }
static void free(char* aString) { ::free(aString); }
};
class CodeAddressServiceStringTable MOZ_FINAL
{
public:
CodeAddressServiceStringTable() : mSet(32) {}
const char* Intern(const char* aString)
{
nsCharPtrHashKey* e = mSet.PutEntry(aString);
return e->GetKey();
}
size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
return mSet.SizeOfExcludingThis(aMallocSizeOf);
}
private:
typedef nsTHashtable<nsCharPtrHashKey> StringSet;
StringSet mSet;
};
typedef CodeAddressService<CodeAddressServiceStringTable,
CodeAddressServiceStringAlloc,
CodeAddressServiceWriter,
CodeAddressServiceLock> WalkTheStackCodeAddressService;
#endif
bool
BlockingResourceBase::Print(nsACString& aOut) const
@ -131,7 +199,18 @@ BlockingResourceBase::Print(nsACString& aOut) const
}
fputs(" calling context\n", stderr);
#ifdef MOZ_CALLSTACK_DISABLED
fputs(" [stack trace unavailable]\n", stderr);
#else
const AcquisitionState& state = acquired ? mAcquired : mFirstSeen;
WalkTheStackCodeAddressService addressService;
CodeAddressServiceWriter writer(aOut);
for (uint32_t i = 0; i < state.Length(); i++) {
addressService.WriteLocation(writer, state[i]);
}
#endif
return acquired;
}