Changeset 199754 in webkit for trunk/Source/JavaScriptCore/jsc.cpp

Timestamp:

Apr 19, 2016, 7:24:53 PM (9 years ago)

Author:

[email protected]

Message:

allow jsc shell to dump sampling profiler data
​https://bugs.webkit.org/show_bug.cgi?id=156725

Reviewed by Benjamin Poulain.

This patch adds a '--reportSamplingProfilerData' option to the
JSC shell which will enable the sampling profiler and dump
its data at the end of execution. The dump will include the
40 hottest functions and the 80 hottest bytecode locations.
If you're using this option to debug, it's easy to just hack
on the code to make it dump more or less information.

• jsc.cpp:

(CommandLine::parseArguments):
(jscmain):

• runtime/Options.h:
• runtime/SamplingProfiler.cpp:

(JSC::SamplingProfiler::processUnverifiedStackTraces):
(JSC::SamplingProfiler::stackTracesAsJSON):
(JSC::SamplingProfiler::reportTopFunctions):
(JSC::SamplingProfiler::reportTopBytecodes):

• runtime/SamplingProfiler.h:

(JSC::SamplingProfiler::StackFrame::hasExpressionInfo):
(JSC::SamplingProfiler::StackFrame::hasBytecodeIndex):
(JSC::SamplingProfiler::StackFrame::hasCodeBlockHash):
(JSC::SamplingProfiler::setStopWatch):

File:

• trunk/Source/JavaScriptCore/jsc.cpp (modified) (3 diffs)

trunk/Source/JavaScriptCore/jsc.cpp

@@ -661 +661 @@
     bool m_profile { false };
     String m_profilerOutput;
+    bool m_dumpSamplingProfilerData { false };
 
     void parseArguments(int, char**);
@@ -2167 +2168 @@
             continue;
         }
+        if (!strcmp(arg, "--reportSamplingProfilerData")) {
+            JSC::Options::useSamplingProfiler() = true;
+            JSC::Options::collectSamplingProfilerDataForJSCShell() = true;
+            m_dumpSamplingProfilerData = true;
+            continue;
+        }
 
         // See if the -- option is a JSC VM option.
@@ -2267 +2274 @@
     }
 
+    if (options.m_dumpSamplingProfilerData) {
+        vm->samplingProfiler()->reportTopFunctions();
+        vm->samplingProfiler()->reportTopBytecodes();
+    }
+
     printSuperSamplerState();