/[jscoverage]/trunk/js/jsdtracef.c
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Contents of /trunk/js/jsdtracef.c

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Revision 399 - (show annotations)
Tue Dec 9 03:37:47 2008 UTC (10 years, 11 months ago) by siliconforks
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1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 * vim: set ts=8 sw=4 et tw=80:
3 *
4 * ***** BEGIN LICENSE BLOCK *****
5 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6 *
7 * The contents of this file are subject to the Mozilla Public License Version
8 * 1.1 (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
10 * http://www.mozilla.org/MPL/
11 *
12 * Software distributed under the License is distributed on an "AS IS" basis,
13 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14 * for the specific language governing rights and limitations under the
15 * License.
16 *
17 * Copyright (C) 2007 Sun Microsystems, Inc. All Rights Reserved.
18 *
19 * Contributor(s):
20 * Brendan Eich <brendan@mozilla.org>
21 *
22 * Alternatively, the contents of this file may be used under the terms of
23 * either of the GNU General Public License Version 2 or later (the "GPL"),
24 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
25 * in which case the provisions of the GPL or the LGPL are applicable instead
26 * of those above. If you wish to allow use of your version of this file only
27 * under the terms of either the GPL or the LGPL, and not to allow others to
28 * use your version of this file under the terms of the MPL, indicate your
29 * decision by deleting the provisions above and replace them with the notice
30 * and other provisions required by the GPL or the LGPL. If you do not delete
31 * the provisions above, a recipient may use your version of this file under
32 * the terms of any one of the MPL, the GPL or the LGPL.
33 *
34 * ***** END LICENSE BLOCK ***** */
35
36 #include "jsapi.h"
37 #include "jsutil.h"
38 #include "jsatom.h"
39 #include "jscntxt.h"
40 #include "jsdbgapi.h"
41 #include "jsfun.h"
42 #include "jsinterp.h"
43 #include "jsobj.h"
44 #include "jsscript.h"
45 #include "jsstr.h"
46
47 #include "jsdtracef.h"
48 #include <sys/types.h>
49
50 #define TYPEOF(cx,v) (JSVAL_IS_NULL(v) ? JSTYPE_NULL : JS_TypeOfValue(cx,v))
51
52 static char dempty[] = "<null>";
53
54 char *
55 jsdtrace_funcclass_name(JSFunction *fun)
56 {
57 return (!FUN_INTERPRETED(fun) &&
58 !(fun->flags & JSFUN_TRACEABLE) &&
59 FUN_CLASP(fun))
60 ? (char *)FUN_CLASP(fun)->name
61 : dempty;
62 }
63
64 char *
65 jsdtrace_filename(JSStackFrame *fp)
66 {
67 while (fp && fp->script == NULL)
68 fp = fp->down;
69 return (fp && fp->script && fp->script->filename)
70 ? (char *)fp->script->filename
71 : dempty;
72 }
73
74 int
75 jsdtrace_linenumber(JSContext *cx, JSStackFrame *fp)
76 {
77 while (fp && fp->script == NULL)
78 fp = fp->down;
79 return (fp && fp->regs)
80 ? (int) js_PCToLineNumber(cx, fp->script, fp->regs->pc)
81 : -1;
82 }
83
84 /*
85 * This function is used to convert function arguments and return value (jsval)
86 * into the following based on each value's type tag:
87 *
88 * jsval returned
89 * -------------------
90 * STRING -> char *
91 * INT -> int
92 * DOUBLE -> double *
93 * BOOLEAN -> int
94 * OBJECT -> void *
95 *
96 * All are presented as void * for DTrace consumers to use, after shifting or
97 * masking out the JavaScript type bits. This allows D scripts to use ints and
98 * booleans directly and copyinstr() for string arguments, when types are known
99 * beforehand.
100 *
101 * This is used by the function-args and function-rval probes, which also
102 * provide raw (unmasked) jsvals should type info be useful from D scripts.
103 */
104 void *
105 jsdtrace_jsvaltovoid(JSContext *cx, jsval argval)
106 {
107 JSType type = TYPEOF(cx, argval);
108
109 switch (type) {
110 case JSTYPE_NULL:
111 case JSTYPE_VOID:
112 return (void *)JS_TYPE_STR(type);
113
114 case JSTYPE_BOOLEAN:
115 return (void *)JSVAL_TO_BOOLEAN(argval);
116
117 case JSTYPE_STRING:
118 return (void *)js_GetStringBytes(cx, JSVAL_TO_STRING(argval));
119
120 case JSTYPE_NUMBER:
121 if (JSVAL_IS_INT(argval))
122 return (void *)JSVAL_TO_INT(argval);
123 return JSVAL_TO_DOUBLE(argval);
124
125 default:
126 return JSVAL_TO_GCTHING(argval);
127 }
128 /* NOTREACHED */
129 }
130
131 char *
132 jsdtrace_function_name(JSContext *cx, JSStackFrame *fp, JSFunction *fun)
133 {
134 JSAtom *atom;
135 JSFrameRegs *regs;
136 JSScript *script;
137 jsbytecode *pc;
138 char *name;
139
140 atom = fun->atom;
141 if (!atom) {
142 if (fp->fun != fun || !fp->down)
143 return dempty;
144
145 regs = fp->down->regs;
146 if (!regs)
147 return dempty;
148
149 /*
150 * An anonymous function called from an active script or interpreted
151 * function: try to fetch the variable or property name by which the
152 * anonymous function was invoked.
153 */
154 pc = regs->pc;
155 script = fp->down->script;
156 switch ((JSOp) *pc) {
157 case JSOP_CALL:
158 case JSOP_EVAL:
159 JS_ASSERT(fp->argv == regs->sp - (int)GET_ARGC(pc));
160
161 /*
162 * FIXME bug 422864: update this code to use the pc stack from the
163 * decompiler.
164 */
165 break;
166 default: ;
167 }
168
169 switch ((JSOp) *pc) {
170 case JSOP_CALLNAME:
171 case JSOP_CALLPROP:
172 case JSOP_NAME:
173 case JSOP_SETNAME:
174 case JSOP_GETPROP:
175 case JSOP_SETPROP:
176 GET_ATOM_FROM_BYTECODE(script, pc, 0, atom);
177 break;
178
179 case JSOP_CALLELEM:
180 case JSOP_GETELEM:
181 case JSOP_SETELEM:
182 case JSOP_CALLGVAR:
183 case JSOP_GETGVAR:
184 case JSOP_SETGVAR:
185 case JSOP_CALLARG:
186 case JSOP_CALLLOCAL:
187 /* FIXME: try to recover a name from these ops. */
188 /* FALL THROUGH */
189
190 default:
191 return dempty;
192 }
193 }
194
195 name = (char *)js_GetStringBytes(cx, ATOM_TO_STRING(atom));
196 return name ? name : dempty;
197 }
198
199 /*
200 * These functions call the DTrace macros for the JavaScript USDT probes.
201 * Originally this code was inlined in the JavaScript code; however since
202 * a number of operations are called, these have been placed into functions
203 * to reduce any negative compiler optimization effect that the addition of
204 * a number of usually unused lines of code would cause.
205 */
206 void
207 jsdtrace_function_entry(JSContext *cx, JSStackFrame *fp, JSFunction *fun)
208 {
209 JAVASCRIPT_FUNCTION_ENTRY(
210 jsdtrace_filename(fp),
211 jsdtrace_funcclass_name(fun),
212 jsdtrace_function_name(cx, fp, fun)
213 );
214 }
215
216 void
217 jsdtrace_function_info(JSContext *cx, JSStackFrame *fp, JSStackFrame *dfp,
218 JSFunction *fun)
219 {
220 JAVASCRIPT_FUNCTION_INFO(
221 jsdtrace_filename(fp),
222 jsdtrace_funcclass_name(fun),
223 jsdtrace_function_name(cx, fp, fun),
224 fp->script->lineno,
225 jsdtrace_filename(dfp),
226 jsdtrace_linenumber(cx, dfp)
227 );
228 }
229
230 void
231 jsdtrace_function_args(JSContext *cx, JSStackFrame *fp, JSFunction *fun)
232 {
233 JAVASCRIPT_FUNCTION_ARGS(
234 jsdtrace_filename(fp),
235 jsdtrace_funcclass_name(fun),
236 jsdtrace_function_name(cx, fp, fun),
237 fp->argc, (void *)fp->argv,
238 (fp->argc > 0) ? jsdtrace_jsvaltovoid(cx, fp->argv[0]) : 0,
239 (fp->argc > 1) ? jsdtrace_jsvaltovoid(cx, fp->argv[1]) : 0,
240 (fp->argc > 2) ? jsdtrace_jsvaltovoid(cx, fp->argv[2]) : 0,
241 (fp->argc > 3) ? jsdtrace_jsvaltovoid(cx, fp->argv[3]) : 0,
242 (fp->argc > 4) ? jsdtrace_jsvaltovoid(cx, fp->argv[4]) : 0
243 );
244 }
245
246 void
247 jsdtrace_function_rval(JSContext *cx, JSStackFrame *fp, JSFunction *fun)
248 {
249 JAVASCRIPT_FUNCTION_RVAL(
250 jsdtrace_filename(fp),
251 jsdtrace_funcclass_name(fun),
252 jsdtrace_function_name(cx, fp, fun),
253 jsdtrace_linenumber(cx, fp), (void *)fp->rval,
254 jsdtrace_jsvaltovoid(cx, fp->rval)
255 );
256 }
257
258 void
259 jsdtrace_function_return(JSContext *cx, JSStackFrame *fp, JSFunction *fun)
260 {
261 JAVASCRIPT_FUNCTION_RETURN(
262 jsdtrace_filename(fp),
263 jsdtrace_funcclass_name(fun),
264 jsdtrace_function_name(cx, fp, fun)
265 );
266 }
267
268 void
269 jsdtrace_object_create_start(JSStackFrame *fp, JSClass *clasp)
270 {
271 JAVASCRIPT_OBJECT_CREATE_START(jsdtrace_filename(fp), (char *)clasp->name);
272 }
273
274 void
275 jsdtrace_object_create_done(JSStackFrame *fp, JSClass *clasp)
276 {
277 JAVASCRIPT_OBJECT_CREATE_DONE(jsdtrace_filename(fp), (char *)clasp->name);
278 }
279
280 void
281 jsdtrace_object_create(JSContext *cx, JSClass *clasp, JSObject *obj)
282 {
283 JAVASCRIPT_OBJECT_CREATE(
284 jsdtrace_filename(cx->fp),
285 (char *)clasp->name,
286 (uintptr_t)obj,
287 jsdtrace_linenumber(cx, cx->fp)
288 );
289 }
290
291 void
292 jsdtrace_object_finalize(JSObject *obj)
293 {
294 JSClass *clasp;
295
296 clasp = LOCKED_OBJ_GET_CLASS(obj);
297
298 /* the first arg is NULL - reserved for future use (filename?) */
299 JAVASCRIPT_OBJECT_FINALIZE(NULL, (char *)clasp->name, (uintptr_t)obj);
300 }
301
302 void
303 jsdtrace_execute_start(JSScript *script)
304 {
305 JAVASCRIPT_EXECUTE_START(
306 script->filename ? (char *)script->filename : dempty,
307 script->lineno
308 );
309 }
310
311 void
312 jsdtrace_execute_done(JSScript *script)
313 {
314 JAVASCRIPT_EXECUTE_DONE(
315 script->filename ? (char *)script->filename : dempty,
316 script->lineno
317 );
318 }

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