1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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 "vm/Probes-inl.h"
#ifdef INCLUDE_MOZILLA_DTRACE
# include "vm/JSScript-inl.h"
#endif
using namespace js;
const char probes::nullName[] = "(null)";
const char probes::anonymousName[] = "(anonymous)";
bool probes::ProfilingActive = true;
#ifdef INCLUDE_MOZILLA_DTRACE
static const char* ScriptFilename(const JSScript* script) {
if (!script) {
return probes::nullName;
}
if (!script->filename()) {
return probes::anonymousName;
}
return script->filename();
}
static const char* FunctionName(JSContext* cx, JSFunction* fun,
UniqueChars* bytes) {
if (!fun) {
return probes::nullName;
}
if (!fun->displayAtom()) {
return probes::anonymousName;
}
// TODO: Should be JS_EncodeStringToUTF8, but that'd introduce a rooting
// hazard, because JS_EncodeStringToUTF8 can GC.
*bytes = JS_EncodeStringToLatin1(cx, fun->displayAtom());
return *bytes ? bytes->get() : probes::nullName;
}
/*
* These functions call the DTrace macros for the JavaScript USDT probes.
* Originally this code was inlined in the JavaScript code; however since
* a number of operations are called, these have been placed into functions
* to reduce any negative compiler optimization effect that the addition of
* a number of usually unused lines of code would cause.
*/
void probes::DTraceEnterJSFun(JSContext* cx, JSFunction* fun,
JSScript* script) {
UniqueChars funNameBytes;
JAVASCRIPT_FUNCTION_ENTRY(ScriptFilename(script), probes::nullName,
FunctionName(cx, fun, &funNameBytes));
}
void probes::DTraceExitJSFun(JSContext* cx, JSFunction* fun, JSScript* script) {
UniqueChars funNameBytes;
JAVASCRIPT_FUNCTION_RETURN(ScriptFilename(script), probes::nullName,
FunctionName(cx, fun, &funNameBytes));
}
#endif
|
