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      1 /*
      2  * Copyright (C) 2008 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include "config.h"
     30 #include "Profiler.h"
     31 
     32 #include "CommonIdentifiers.h"
     33 #include "CallFrame.h"
     34 #include "CodeBlock.h"
     35 #include "JSFunction.h"
     36 #include "JSGlobalObject.h"
     37 #include "Nodes.h"
     38 #include "Profile.h"
     39 #include "ProfileGenerator.h"
     40 #include "ProfileNode.h"
     41 #include <stdio.h>
     42 
     43 namespace JSC {
     44 
     45 static const char* GlobalCodeExecution = "(program)";
     46 static const char* AnonymousFunction = "(anonymous function)";
     47 static unsigned ProfilesUID = 0;
     48 
     49 static CallIdentifier createCallIdentifierFromFunctionImp(ExecState*, JSFunction*);
     50 
     51 Profiler* Profiler::s_sharedProfiler = 0;
     52 Profiler* Profiler::s_sharedEnabledProfilerReference = 0;
     53 
     54 Profiler* Profiler::profiler()
     55 {
     56     if (!s_sharedProfiler)
     57         s_sharedProfiler = new Profiler();
     58     return s_sharedProfiler;
     59 }
     60 
     61 void Profiler::startProfiling(ExecState* exec, const UString& title)
     62 {
     63     ASSERT_ARG(title, !title.isNull());
     64 
     65     // Check if we currently have a Profile for this global ExecState and title.
     66     // If so return early and don't create a new Profile.
     67     ExecState* globalExec = exec ? exec->lexicalGlobalObject()->globalExec() : 0;
     68 
     69     for (size_t i = 0; i < m_currentProfiles.size(); ++i) {
     70         ProfileGenerator* profileGenerator = m_currentProfiles[i].get();
     71         if (profileGenerator->originatingGlobalExec() == globalExec && profileGenerator->title() == title)
     72             return;
     73     }
     74 
     75     s_sharedEnabledProfilerReference = this;
     76     RefPtr<ProfileGenerator> profileGenerator = ProfileGenerator::create(title, exec, ++ProfilesUID);
     77     m_currentProfiles.append(profileGenerator);
     78 }
     79 
     80 PassRefPtr<Profile> Profiler::stopProfiling(ExecState* exec, const UString& title)
     81 {
     82     ExecState* globalExec = exec ? exec->lexicalGlobalObject()->globalExec() : 0;
     83     for (ptrdiff_t i = m_currentProfiles.size() - 1; i >= 0; --i) {
     84         ProfileGenerator* profileGenerator = m_currentProfiles[i].get();
     85         if (profileGenerator->originatingGlobalExec() == globalExec && (title.isNull() || profileGenerator->title() == title)) {
     86             profileGenerator->stopProfiling();
     87             RefPtr<Profile> returnProfile = profileGenerator->profile();
     88 
     89             m_currentProfiles.remove(i);
     90             if (!m_currentProfiles.size())
     91                 s_sharedEnabledProfilerReference = 0;
     92 
     93             return returnProfile;
     94         }
     95     }
     96 
     97     return 0;
     98 }
     99 
    100 static inline void dispatchFunctionToProfiles(const Vector<RefPtr<ProfileGenerator> >& profiles, ProfileGenerator::ProfileFunction function, const CallIdentifier& callIdentifier, unsigned currentProfileTargetGroup)
    101 {
    102     for (size_t i = 0; i < profiles.size(); ++i) {
    103         if (profiles[i]->profileGroup() == currentProfileTargetGroup || !profiles[i]->originatingGlobalExec())
    104             (profiles[i].get()->*function)(callIdentifier);
    105     }
    106 }
    107 
    108 void Profiler::willExecute(ExecState* exec, JSValue function)
    109 {
    110     ASSERT(!m_currentProfiles.isEmpty());
    111 
    112     dispatchFunctionToProfiles(m_currentProfiles, &ProfileGenerator::willExecute, createCallIdentifier(exec, function, "", 0), exec->lexicalGlobalObject()->profileGroup());
    113 }
    114 
    115 void Profiler::willExecute(ExecState* exec, const UString& sourceURL, int startingLineNumber)
    116 {
    117     ASSERT(!m_currentProfiles.isEmpty());
    118 
    119     CallIdentifier callIdentifier = createCallIdentifier(exec, JSValue(), sourceURL, startingLineNumber);
    120 
    121     dispatchFunctionToProfiles(m_currentProfiles, &ProfileGenerator::willExecute, callIdentifier, exec->lexicalGlobalObject()->profileGroup());
    122 }
    123 
    124 void Profiler::didExecute(ExecState* exec, JSValue function)
    125 {
    126     ASSERT(!m_currentProfiles.isEmpty());
    127 
    128     dispatchFunctionToProfiles(m_currentProfiles, &ProfileGenerator::didExecute, createCallIdentifier(exec, function, "", 0), exec->lexicalGlobalObject()->profileGroup());
    129 }
    130 
    131 void Profiler::didExecute(ExecState* exec, const UString& sourceURL, int startingLineNumber)
    132 {
    133     ASSERT(!m_currentProfiles.isEmpty());
    134 
    135     dispatchFunctionToProfiles(m_currentProfiles, &ProfileGenerator::didExecute, createCallIdentifier(exec, JSValue(), sourceURL, startingLineNumber), exec->lexicalGlobalObject()->profileGroup());
    136 }
    137 
    138 CallIdentifier Profiler::createCallIdentifier(ExecState* exec, JSValue functionValue, const UString& defaultSourceURL, int defaultLineNumber)
    139 {
    140     if (!functionValue)
    141         return CallIdentifier(GlobalCodeExecution, defaultSourceURL, defaultLineNumber);
    142     if (!functionValue.isObject())
    143         return CallIdentifier("(unknown)", defaultSourceURL, defaultLineNumber);
    144     if (asObject(functionValue)->inherits(&JSFunction::info)) {
    145         JSFunction* function = asFunction(functionValue);
    146         if (!function->executable()->isHostFunction())
    147             return createCallIdentifierFromFunctionImp(exec, function);
    148     }
    149     if (asObject(functionValue)->inherits(&InternalFunction::info))
    150         return CallIdentifier(static_cast<InternalFunction*>(asObject(functionValue))->name(exec), defaultSourceURL, defaultLineNumber);
    151     return CallIdentifier(makeString("(", asObject(functionValue)->className(), " object)"), defaultSourceURL, defaultLineNumber);
    152 }
    153 
    154 CallIdentifier createCallIdentifierFromFunctionImp(ExecState* exec, JSFunction* function)
    155 {
    156     ASSERT(!function->isHostFunction());
    157     const UString& name = function->calculatedDisplayName(exec);
    158     return CallIdentifier(name.isEmpty() ? AnonymousFunction : name, function->jsExecutable()->sourceURL(), function->jsExecutable()->lineNo());
    159 }
    160 
    161 } // namespace JSC
    162