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Bug 901022 - write to MOZ_TRACE_FILE when the visual event tracer is stopped; r=honzab

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DONTBUILD because NPOTB
This commit is contained in:
Nathan Froyd 2013-07-25 12:21:58 -04:00
parent 3c42cfdae2
commit a671e699c6
3 changed files with 49 additions and 7 deletions
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38
xpcom/base/VisualEventTracer.cpp
View File

@ -580,6 +580,33 @@ VisualEventTracerLog::GetJSONString(nsACString & _retval)
return NS_OK;
}
nsresult
VisualEventTracerLog::WriteToProfilingFile()
{
const char* filename = PR_GetEnv("MOZ_TRACE_FILE");
if (!filename) {
return NS_OK;
}
PRFileDesc* fd = PR_Open(filename, PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE,
0644);
if (!fd) {
return NS_ERROR_FILE_ACCESS_DENIED;
}
nsCString json;
GetJSONString(json);
int32_t bytesWritten = PR_Write(fd, json.get(), json.Length());
PR_Close(fd);
if (bytesWritten < json.Length()) {
return NS_ERROR_UNEXPECTED;
}
return NS_OK;
}
NS_IMPL_ISUPPORTS1(VisualEventTracer, nsIVisualEventTracer)
NS_IMETHODIMP
@ -622,7 +649,16 @@ VisualEventTracer::Stop()
gCapture = false;
return NS_OK;
nsresult rv = NS_OK;
if (PR_GetEnv("MOZ_TRACE_FILE")) {
nsCOMPtr<nsIVisualEventTracerLog> tracelog;
rv = Snapshot(getter_AddRefs(tracelog));
if (NS_SUCCEEDED(rv)) {
rv = tracelog->WriteToProfilingFile();
}
}
return rv;
}
NS_IMETHODIMP

8
xpcom/base/VisualEventTracer.h
View File

@ -10,10 +10,10 @@
* To enable this code at build time, add --enable-visual-profiling to your
* configure options.
*
* To enable this code at run time, export MOZ_PROFILING_FILE env var with
* a path to the file to write the log to. This is all you need to produce
* the log of all events instrumentation in the mozilla code.
* Check MOZ_EVENT_TRACER_* macros bellow to add your own.
* To enable this code at run time, export MOZ_TRACE_FILE env var with a
* path to the file to write the log to. This is all you need to * produce
* the log of all events instrumentation in the mozilla code. Check
* MOZ_EVENT_TRACER_* macros below to add your own.
*
* To let the event tracer log only some events to save disk space, export
* MOZ_PROFILING_EVENTS with comma separated list of event names you want

10
xpcom/base/nsIVisualEventTracer.idl
View File

@ -13,7 +13,7 @@ interface nsIVisualEventTracerLog;
* instrumentation around the mozilla code base.
*/
[scriptable, uuid(D51F7867-42F3-4029-8C4E-C00676253A8E)]
[builtinclass, scriptable, uuid(713ee3ca-95e0-4085-8616-f6d64a9508ad)]
interface nsIVisualEventTracer : nsISupports
{
/**
@ -43,11 +43,17 @@ interface nsIVisualEventTracer : nsISupports
nsIVisualEventTracerLog snapshot();
};
[scriptable, uuid(52EC8962-F67C-4f49-A9D6-89B8EBDA2649)]
[builtinclass, scriptable, uuid(8ec6e36d-6cba-400b-bcd6-454679f5f75a)]
interface nsIVisualEventTracerLog : nsISupports
{
/**
* JSON string of the log. Use JSON.parse to get it as an object.
*/
readonly attribute ACString JSONString;
/**
* Write the JSON string returned by JSONString to the log defined by
* the environment variable MOZ_PROFILING_FILE.
*/
void writeToProfilingFile();
};