The Tor Browser: js/src/devtools/Instruments.cpp@6474c204b198 (annotated)

js/src/devtools/Instruments.cpp@6474c204b198 (annotated)

js/src/devtools/Instruments.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "Instruments.h"
 #ifdef __APPLE__
 #include <dlfcn.h>
 #include <CoreFoundation/CoreFoundation.h>
 #include <unistd.h>
 // There are now 2 paths to the DTPerformanceSession framework. We try to load
 // the one contained in /Applications/Xcode.app first, falling back to the one
 // contained in /Library/Developer/4.0/Instruments.
 #define DTPerformanceLibraryPath "/Applications/Xcode.app/Contents/Developer/Library/Frameworks/DTPerformanceSession.framework/Versions/Current/DTPerformanceSession"
 #define OldDTPerformanceLibraryPath "/Library/Developer/4.0/Instruments/Frameworks/DTPerformanceSession.framework/Versions/Current/DTPerformanceSession"
 extern "C" {
 typedef CFTypeRef DTPerformanceSessionRef;
 #define DTPerformanceSession_TimeProfiler               "com.apple.instruments.dtps.timeprofiler"
 // DTPerformanceSession_Option_SamplingInterval is measured in microseconds
 #define DTPerformanceSession_Option_SamplingInterval    "com.apple.instruments.dtps.option.samplinginterval"
 typedef void (*dtps_errorcallback_t)(CFStringRef, CFErrorRef);
 typedef DTPerformanceSessionRef (*DTPerformanceSessionCreateFunction)(CFStringRef, CFStringRef, CFDictionaryRef, CFErrorRef*);
 typedef bool (*DTPerformanceSessionAddInstrumentFunction)(DTPerformanceSessionRef, CFStringRef, CFDictionaryRef, dtps_errorcallback_t, CFErrorRef*);
 typedef bool (*DTPerformanceSessionIsRecordingFunction)(DTPerformanceSessionRef);
 typedef bool (*DTPerformanceSessionStartFunction)(DTPerformanceSessionRef, CFArrayRef, CFErrorRef*);
 typedef bool (*DTPerformanceSessionStopFunction)(DTPerformanceSessionRef, CFArrayRef, CFErrorRef*);
 typedef bool (*DTPerformanceSessionSaveFunction)(DTPerformanceSessionRef, CFStringRef, CFErrorRef*);
 } // extern "C"
 namespace Instruments {
 static const int kSamplingInterval = 20; // microseconds
 template<typename T>
 class AutoReleased
 {
 public:
   AutoReleased(T aTypeRef) : mTypeRef(aTypeRef)
   {
   }
   ~AutoReleased()
   {
     if (mTypeRef) {
       CFRelease(mTypeRef);
     }
   }
   operator T()
   {
     return mTypeRef;
   }
 private:
   T mTypeRef;
 };
 #define DTPERFORMANCE_SYMBOLS \
   SYMBOL(DTPerformanceSessionCreate) \
   SYMBOL(DTPerformanceSessionAddInstrument) \
   SYMBOL(DTPerformanceSessionIsRecording) \
   SYMBOL(DTPerformanceSessionStart) \
   SYMBOL(DTPerformanceSessionStop) \
   SYMBOL(DTPerformanceSessionSave)
 #define SYMBOL(_sym) \
   _sym##Function _sym = nullptr;
 DTPERFORMANCE_SYMBOLS
 #undef SYMBOL
 void*
 LoadDTPerformanceLibraries(bool dontLoad)
 {
   int flags = RTLD_LAZY | RTLD_LOCAL | RTLD_NODELETE;
   if (dontLoad) {
     flags |= RTLD_NOLOAD;
   }
   void *DTPerformanceLibrary = dlopen(DTPerformanceLibraryPath, flags);
   if (!DTPerformanceLibrary) {
     DTPerformanceLibrary = dlopen(OldDTPerformanceLibraryPath, flags);
   }
   return DTPerformanceLibrary;
 }
 bool
 LoadDTPerformanceLibrary()
 {
   void *DTPerformanceLibrary = LoadDTPerformanceLibraries(true);
   if (!DTPerformanceLibrary) {
     DTPerformanceLibrary = LoadDTPerformanceLibraries(false);
     if (!DTPerformanceLibrary) {
       return false;
     }
   }
 #define SYMBOL(_sym) \
   _sym = reinterpret_cast<_sym##Function>(dlsym(DTPerformanceLibrary, #_sym)); \
   if (!_sym) { \
     dlclose(DTPerformanceLibrary); \
     DTPerformanceLibrary = nullptr; \
     return false; \
   }
   DTPERFORMANCE_SYMBOLS
 #undef SYMBOL
   dlclose(DTPerformanceLibrary);
   return true;
 }
 static DTPerformanceSessionRef gSession;
 bool
 Error(CFErrorRef error)
 {
   if (gSession) {
     CFErrorRef unused = nullptr;
     DTPerformanceSessionStop(gSession, nullptr, &unused);
     CFRelease(gSession);
     gSession = nullptr;
   }
 #ifdef DEBUG
   AutoReleased<CFDataRef> data =
     CFStringCreateExternalRepresentation(nullptr,
                                          CFErrorCopyDescription(error),
                                          kCFStringEncodingUTF8, '?');
   if (data != nullptr) {
     printf("%.*s\n\n", (int)CFDataGetLength(data), CFDataGetBytePtr(data));
   }
 #endif
   return false;
 }
 bool
 Start(pid_t pid)
 {
   if (gSession) {
     return false;
   }
   if (!LoadDTPerformanceLibrary()) {
     return false;
   }
   AutoReleased<CFStringRef> process =
     CFStringCreateWithFormat(kCFAllocatorDefault, nullptr, CFSTR("%d"), pid);
   if (!process) {
     return false;
   }
   CFErrorRef error = nullptr;
   gSession = DTPerformanceSessionCreate(nullptr, process, nullptr, &error);
   if (!gSession) {
     return Error(error);
   }
   AutoReleased<CFNumberRef> interval =
     CFNumberCreate(0, kCFNumberIntType, &kSamplingInterval);
   if (!interval) {
     return false;
   }
   CFStringRef keys[1] = { CFSTR(DTPerformanceSession_Option_SamplingInterval) };
   CFNumberRef values[1] = { interval };
   AutoReleased<CFDictionaryRef> options =
     CFDictionaryCreate(kCFAllocatorDefault, (const void**)keys,
                        (const void**)values, 1, &kCFTypeDictionaryKeyCallBacks,
                        &kCFTypeDictionaryValueCallBacks);
   if (!options) {
     return false;
   }
   if (!DTPerformanceSessionAddInstrument(gSession,
                                          CFSTR(DTPerformanceSession_TimeProfiler),
                                          options, nullptr, &error)) {
     return Error(error);
   }
   return Resume();
 }
 void
 Pause()
 {
   if (gSession && DTPerformanceSessionIsRecording(gSession)) {
     CFErrorRef error = nullptr;
     if (!DTPerformanceSessionStop(gSession, nullptr, &error)) {
       Error(error);
     }
   }
 }
 bool
 Resume()
 {
   if (!gSession) {
     return false;
   }
   CFErrorRef error = nullptr;
   return DTPerformanceSessionStart(gSession, nullptr, &error) ||
          Error(error);
 }
 void
 Stop(const char* profileName)
 {
   Pause();
   CFErrorRef error = nullptr;
   AutoReleased<CFStringRef> name =
     CFStringCreateWithFormat(kCFAllocatorDefault, nullptr, CFSTR("%s%s"),
                              "/tmp/", profileName ? profileName : "mozilla");
   if (!DTPerformanceSessionSave(gSession, name, &error)) {
     Error(error);
     return;
   }
   CFRelease(gSession);
   gSession = nullptr;
 }
 } // namespace Instruments
 #endif /* __APPLE__ */

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js/src/devtools/Instruments.cpp@6474c204b198 (annotated)

js/src/devtools/Instruments.cpp