The Tor Browser: js/src/vm/Probes.cpp@6474c204b198

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

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  * vim: set ts=8 sts=4 et sw=4 tw=99:

     3  * This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #include "vm/Probes-inl.h"

     9 #include "jscntxt.h"

    11 #ifdef INCLUDE_MOZILLA_DTRACE

    12 #include "jsscriptinlines.h"

    13 #endif

    15 #define TYPEOF(cx,v)    (JSVAL_IS_NULL(v) ? JSTYPE_NULL : JS_TypeOfValue(cx,v))

    17 using namespace js;

    19 const char probes::nullName[] = "(null)";

    20 const char probes::anonymousName[] = "(anonymous)";

    22 bool probes::ProfilingActive = true;

    24 probes::JITReportGranularity

    25 probes::JITGranularityRequested(JSContext *cx)

    26 {

    27     if (cx->runtime()->spsProfiler.enabled())

    28         return JITREPORT_GRANULARITY_LINE;

    29     return JITREPORT_GRANULARITY_NONE;

    30 }

    32 /* ICs are unregistered in a batch */

    33 void

    34 probes::DiscardExecutableRegion(void *start, size_t size)

    35 {

    36     /*

    37      * Not needed for SPS because ICs are disposed of when the normal JITChunk

    38      * is disposed of

    39      */

    40 }

    42 #ifdef INCLUDE_MOZILLA_DTRACE

    43 static const char *

    44 ScriptFilename(const JSScript *script)

    45 {

    46     if (!script)

    47         return probes::nullName;

    48     if (!script->filename())

    49         return probes::anonymousName;

    50     return script->filename();

    51 }

    53 static const char *

    54 FunctionName(JSContext *cx, JSFunction *fun, JSAutoByteString* bytes)

    55 {

    56     if (!fun)

    57         return probes::nullName;

    58     if (!fun->displayAtom())

    59         return probes::anonymousName;

    60     return bytes->encodeLatin1(cx, fun->displayAtom()) ? bytes->ptr() : probes::nullName;

    61 }

    63 /*

    64  * These functions call the DTrace macros for the JavaScript USDT probes.

    65  * Originally this code was inlined in the JavaScript code; however since

    66  * a number of operations are called, these have been placed into functions

    67  * to reduce any negative compiler optimization effect that the addition of

    68  * a number of usually unused lines of code would cause.

    69  */

    70 void

    71 probes::DTraceEnterJSFun(JSContext *cx, JSFunction *fun, JSScript *script)

    72 {

    73     JSAutoByteString funNameBytes;

    74     JAVASCRIPT_FUNCTION_ENTRY(ScriptFilename(script), probes::nullName,

    75                               FunctionName(cx, fun, &funNameBytes));

    76 }

    78 void

    79 probes::DTraceExitJSFun(JSContext *cx, JSFunction *fun, JSScript *script)

    80 {

    81     JSAutoByteString funNameBytes;

    82     JAVASCRIPT_FUNCTION_RETURN(ScriptFilename(script), probes::nullName,

    83                                FunctionName(cx, fun, &funNameBytes));

    84 }

    85 #endif

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