/[jscoverage]/trunk/instrument-js.cpp
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Revision 84 - (hide annotations)
Sat Dec 1 01:44:21 2007 UTC (10 years, 8 months ago) by siliconforks
Original Path: trunk/instrument-js.c
File MIME type: text/plain
File size: 23585 byte(s)
Use dot syntax in preference to array subscript syntax.

1 siliconforks 2 /*
2     instrument-js.c - JavaScript instrumentation routines
3     Copyright (C) 2007 siliconforks.com
4    
5     This program is free software; you can redistribute it and/or modify
6     it under the terms of the GNU General Public License as published by
7     the Free Software Foundation; either version 2 of the License, or
8     (at your option) any later version.
9    
10     This program is distributed in the hope that it will be useful,
11     but WITHOUT ANY WARRANTY; without even the implied warranty of
12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13     GNU General Public License for more details.
14    
15     You should have received a copy of the GNU General Public License along
16     with this program; if not, write to the Free Software Foundation, Inc.,
17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18     */
19    
20     #include "instrument-js.h"
21    
22     #include <assert.h>
23     #include <stdlib.h>
24     #include <string.h>
25    
26     #include <jsapi.h>
27     #include <jsatom.h>
28     #include <jsfun.h>
29     #include <jsinterp.h>
30     #include <jsparse.h>
31     #include <jsregexp.h>
32     #include <jsscope.h>
33     #include <jsstr.h>
34    
35     #include "util.h"
36    
37     static JSRuntime * runtime = NULL;
38     static JSContext * context = NULL;
39     static JSObject * global = NULL;
40    
41     /*
42     JSParseNode objects store line numbers starting from 1.
43     The lines array stores line numbers starting from 0.
44     */
45     static const char * file_id = NULL;
46     static char * lines = NULL;
47    
48     void jscoverage_init(void) {
49     runtime = JS_NewRuntime(8L * 1024L * 1024L);
50     if (runtime == NULL) {
51     fatal("cannot create runtime");
52     }
53    
54     context = JS_NewContext(runtime, 8192);
55     if (context == NULL) {
56     fatal("cannot create context");
57     }
58    
59     global = JS_NewObject(context, NULL, NULL, NULL);
60     if (global == NULL) {
61     fatal("cannot create global object");
62     }
63    
64     if (! JS_InitStandardClasses(context, global)) {
65     fatal("cannot initialize standard classes");
66     }
67     }
68    
69     void jscoverage_cleanup(void) {
70     JS_DestroyContext(context);
71     JS_DestroyRuntime(runtime);
72     }
73    
74     static void print_string(JSString * s, FILE * f) {
75     for (int i = 0; i < s->length; i++) {
76     char c = s->chars[i];
77     fputc(c, f);
78     }
79     }
80    
81     static void print_string_atom(JSAtom * atom, FILE * f) {
82     assert(ATOM_IS_STRING(atom));
83     JSString * s = ATOM_TO_STRING(atom);
84     print_string(s, f);
85     }
86    
87     static void print_string_jsval(jsval value, FILE * f) {
88     assert(JSVAL_IS_STRING(value));
89     JSString * s = JSVAL_TO_STRING(value);
90     print_string(s, f);
91     }
92    
93     static void print_quoted_string_atom(JSAtom * atom, FILE * f) {
94     assert(ATOM_IS_STRING(atom));
95     JSString * s = ATOM_TO_STRING(atom);
96     JSString * quoted = js_QuoteString(context, s, '"');
97     print_string(quoted, f);
98     }
99    
100     static const char * get_op(uint8 op) {
101     switch(op) {
102     case JSOP_BITOR:
103     return "|";
104     case JSOP_BITXOR:
105     return "^";
106     case JSOP_BITAND:
107     return "&";
108     case JSOP_EQ:
109     return "==";
110     case JSOP_NE:
111     return "!=";
112     case JSOP_NEW_EQ:
113     return "===";
114     case JSOP_NEW_NE:
115     return "!==";
116     case JSOP_LT:
117     return "<";
118     case JSOP_LE:
119     return "<=";
120     case JSOP_GT:
121     return ">";
122     case JSOP_GE:
123     return ">=";
124     case JSOP_LSH:
125     return "<<";
126     case JSOP_RSH:
127     return ">>";
128     case JSOP_URSH:
129     return ">>>";
130     case JSOP_ADD:
131     return "+";
132     case JSOP_SUB:
133     return "-";
134     case JSOP_MUL:
135     return "*";
136     case JSOP_DIV:
137     return "/";
138     case JSOP_MOD:
139     return "%";
140     default:
141     abort();
142     }
143     }
144    
145     static void instrument_expression(JSParseNode * node, FILE * f);
146     static void instrument_statement(JSParseNode * node, FILE * f, int indent);
147    
148     static void instrument_function(JSParseNode * node, FILE * f, int indent) {
149     assert(node->pn_arity == PN_FUNC);
150     assert(ATOM_IS_OBJECT(node->pn_funAtom));
151     JSObject * object = ATOM_TO_OBJECT(node->pn_funAtom);
152     assert(JS_ObjectIsFunction(context, object));
153     JSFunction * function = (JSFunction *) JS_GetPrivate(context, object);
154     assert(function);
155     assert(object == function->object);
156     fprintf(f, "%*s", indent, "");
157     fprintf(f, "function");
158    
159     /* function name */
160     if (function->atom) {
161     fputc(' ', f);
162     print_string_atom(function->atom, f);
163     }
164    
165     /* function parameters */
166     fprintf(f, "(");
167     JSAtom ** params = xmalloc(function->nargs * sizeof(JSAtom *));
168     for (int i = 0; i < function->nargs; i++) {
169     /* initialize to NULL for sanity check */
170     params[i] = NULL;
171     }
172     JSScope * scope = OBJ_SCOPE(object);
173     for (JSScopeProperty * scope_property = SCOPE_LAST_PROP(scope); scope_property != NULL; scope_property = scope_property->parent) {
174     if (scope_property->getter != js_GetArgument) {
175     continue;
176     }
177     assert(scope_property->flags & SPROP_HAS_SHORTID);
178     assert((uint16) scope_property->shortid < function->nargs);
179     assert(JSID_IS_ATOM(scope_property->id));
180     params[(uint16) scope_property->shortid] = JSID_TO_ATOM(scope_property->id);
181     }
182     for (int i = 0; i < function->nargs; i++) {
183     assert(params[i] != NULL);
184     if (i > 0) {
185     fprintf(f, ", ");
186     }
187     if (ATOM_IS_STRING(params[i])) {
188     print_string_atom(params[i], f);
189     }
190     }
191     fprintf(f, ") {\n");
192     free(params);
193    
194     /* function body */
195     instrument_statement(node->pn_body, f, indent + 2);
196    
197     fprintf(f, "}\n");
198     }
199    
200     static void instrument_function_call(JSParseNode * node, FILE * f) {
201     instrument_expression(node->pn_head, f);
202     fputc('(', f);
203     for (struct JSParseNode * p = node->pn_head->pn_next; p != NULL; p = p->pn_next) {
204     if (p != node->pn_head->pn_next) {
205     fprintf(f, ", ");
206     }
207     instrument_expression(p, f);
208     }
209     fputc(')', f);
210     }
211    
212     /*
213     See <Expressions> in jsparse.h.
214     TOK_FUNCTION is handled as a statement and as an expression.
215     TOK_DBLDOT is not handled (XML op).
216     TOK_DEFSHARP and TOK_USESHARP are not handled.
217     TOK_ANYNAME is not handled (XML op).
218     TOK_AT is not handled (XML op).
219     TOK_DBLCOLON is not handled.
220     TOK_XML* are not handled.
221     There seem to be some undocumented expressions:
222     TOK_INSTANCEOF binary
223     TOK_IN binary
224     */
225     static void instrument_expression(JSParseNode * node, FILE * f) {
226     switch (node->pn_type) {
227     case TOK_FUNCTION:
228     instrument_function(node, f, 0);
229     break;
230     case TOK_COMMA:
231     for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
232     if (p != node->pn_head) {
233     fprintf(f, ", ");
234     }
235     instrument_expression(p, f);
236     }
237     break;
238     case TOK_ASSIGN:
239     instrument_expression(node->pn_left, f);
240     fputc(' ', f);
241     switch (node->pn_op) {
242     case JSOP_ADD:
243     case JSOP_SUB:
244     case JSOP_MUL:
245     case JSOP_MOD:
246     case JSOP_LSH:
247     case JSOP_RSH:
248     case JSOP_URSH:
249     case JSOP_BITAND:
250     case JSOP_BITOR:
251     case JSOP_BITXOR:
252     case JSOP_DIV:
253     fprintf(f, "%s", get_op(node->pn_op));
254     break;
255     default:
256     /* do nothing - it must be a simple assignment */
257     break;
258     }
259     fprintf(f, "= ");
260     instrument_expression(node->pn_right, f);
261     break;
262     case TOK_HOOK:
263     instrument_expression(node->pn_kid1, f);
264     fprintf(f, "? ");
265     instrument_expression(node->pn_kid2, f);
266     fprintf(f, ": ");
267     instrument_expression(node->pn_kid3, f);
268     break;
269     case TOK_OR:
270     instrument_expression(node->pn_left, f);
271     fprintf(f, " || ");
272     instrument_expression(node->pn_right, f);
273     break;
274     case TOK_AND:
275     instrument_expression(node->pn_left, f);
276     fprintf(f, " && ");
277     instrument_expression(node->pn_right, f);
278     break;
279     case TOK_BITOR:
280     case TOK_BITXOR:
281     case TOK_BITAND:
282     case TOK_EQOP:
283     case TOK_RELOP:
284     case TOK_SHOP:
285     case TOK_PLUS:
286     case TOK_MINUS:
287     case TOK_STAR:
288     case TOK_DIVOP:
289     switch (node->pn_arity) {
290     case PN_BINARY:
291     instrument_expression(node->pn_left, f);
292     fprintf(f, " %s ", get_op(node->pn_op));
293     instrument_expression(node->pn_right, f);
294     break;
295     case PN_LIST:
296     for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
297     if (p != node->pn_head) {
298     fprintf(f, " %s ", get_op(node->pn_op));
299     }
300     instrument_expression(p, f);
301     }
302     break;
303     default:
304     abort();
305     }
306     break;
307     case TOK_UNARYOP:
308     switch (node->pn_op) {
309     case JSOP_NEG:
310     fputc('-', f);
311     instrument_expression(node->pn_kid, f);
312     break;
313     case JSOP_POS:
314     fputc('+', f);
315     instrument_expression(node->pn_kid, f);
316     break;
317     case JSOP_NOT:
318     fputc('!', f);
319     instrument_expression(node->pn_kid, f);
320     break;
321     case JSOP_BITNOT:
322     fputc('~', f);
323     instrument_expression(node->pn_kid, f);
324     break;
325     case JSOP_TYPEOF:
326     fprintf(f, "typeof ");
327     instrument_expression(node->pn_kid, f);
328     break;
329     case JSOP_VOID:
330     fprintf(f, "void ");
331     instrument_expression(node->pn_kid, f);
332     break;
333     default:
334     abort();
335     break;
336     }
337     break;
338     case TOK_INC:
339     case TOK_DEC:
340     /*
341     This is not documented, but node->pn_op tells whether it is pre- or post-increment.
342     */
343     switch (node->pn_op) {
344     case JSOP_INCNAME:
345     case JSOP_INCPROP:
346     case JSOP_INCELEM:
347     fprintf(f, "++");
348     instrument_expression(node->pn_kid, f);
349     break;
350     case JSOP_DECNAME:
351     case JSOP_DECPROP:
352     case JSOP_DECELEM:
353     fprintf(f, "--");
354     instrument_expression(node->pn_kid, f);
355     break;
356     case JSOP_NAMEINC:
357     case JSOP_PROPINC:
358     case JSOP_ELEMINC:
359     instrument_expression(node->pn_kid, f);
360     fprintf(f, "++");
361     break;
362     case JSOP_NAMEDEC:
363     case JSOP_PROPDEC:
364     case JSOP_ELEMDEC:
365     instrument_expression(node->pn_kid, f);
366     fprintf(f, "--");
367     break;
368     default:
369     abort();
370     break;
371     }
372     break;
373     case TOK_NEW:
374     fprintf(f, "new ");
375     instrument_function_call(node, f);
376     break;
377     case TOK_DELETE:
378     fprintf(f, "delete ");
379     instrument_expression(node->pn_kid, f);
380     break;
381     case TOK_DOT:
382     /*
383     This may have originally been x['foo-bar']. Because the string 'foo-bar'
384     contains illegal characters, we have to use the subscript syntax instead of
385     the dot syntax.
386     */
387     instrument_expression(node->pn_expr, f);
388 siliconforks 84 assert(ATOM_IS_STRING(node->pn_atom));
389     {
390     JSString * s = ATOM_TO_STRING(node->pn_atom);
391     /* XXX - semantics changed in 1.7 */
392     if (! ATOM_KEYWORD(node->pn_atom) && js_IsIdentifier(s)) {
393     fputc('.', f);
394     print_string_atom(node->pn_atom, f);
395     }
396     else {
397     fputc('[', f);
398     print_quoted_string_atom(node->pn_atom, f);
399     fputc(']', f);
400     }
401     }
402 siliconforks 2 break;
403     case TOK_LB:
404     instrument_expression(node->pn_left, f);
405     fputc('[', f);
406     instrument_expression(node->pn_right, f);
407     fputc(']', f);
408     break;
409     case TOK_LP:
410     instrument_function_call(node, f);
411     break;
412     case TOK_RB:
413     fputc('[', f);
414     for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
415     if (p != node->pn_head) {
416     fprintf(f, ", ");
417     }
418     /* TOK_COMMA is a special case: a hole in the array */
419     if (p->pn_type != TOK_COMMA) {
420     instrument_expression(p, f);
421     }
422     }
423     if (node->pn_extra == PNX_ENDCOMMA) {
424     fputc(',', f);
425     }
426     fputc(']', f);
427     break;
428     case TOK_RC:
429     fputc('{', f);
430     for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
431     assert(p->pn_type == TOK_COLON);
432     if (p != node->pn_head) {
433     fprintf(f, ", ");
434     }
435     instrument_expression(p->pn_left, f);
436     fprintf(f, ": ");
437     instrument_expression(p->pn_right, f);
438     }
439     fputc('}', f);
440     break;
441     case TOK_RP:
442     fputc('(', f);
443     instrument_expression(node->pn_kid, f);
444     fputc(')', f);
445     break;
446     case TOK_NAME:
447     print_string_atom(node->pn_atom, f);
448     break;
449     case TOK_STRING:
450     print_quoted_string_atom(node->pn_atom, f);
451     break;
452     case TOK_OBJECT:
453     switch (node->pn_op) {
454     case JSOP_OBJECT:
455     /* I assume this is JSOP_REGEXP */
456     abort();
457     break;
458     case JSOP_REGEXP:
459     assert(ATOM_IS_OBJECT(node->pn_atom));
460     {
461     JSObject * object = ATOM_TO_OBJECT(node->pn_atom);
462     jsval result;
463     js_regexp_toString(context, object, 0, NULL, &result);
464     print_string_jsval(result, f);
465     }
466     break;
467     default:
468     abort();
469     break;
470     }
471     break;
472     case TOK_NUMBER:
473     /*
474     A 64-bit IEEE 754 floating point number has a 52-bit fraction.
475     2^(-52) = 2.22 x 10^(-16)
476     Thus there are 16 significant digits.
477     To keep the output simple, special-case zero.
478     */
479     if (node->pn_dval == 0.0) {
480     fprintf(f, "0");
481     }
482     else {
483     fprintf(f, "%.15g", node->pn_dval);
484     }
485     break;
486     case TOK_PRIMARY:
487     switch (node->pn_op) {
488     case JSOP_TRUE:
489     fprintf(f, "true");
490     break;
491     case JSOP_FALSE:
492     fprintf(f, "false");
493     break;
494     case JSOP_NULL:
495     fprintf(f, "null");
496     break;
497     case JSOP_THIS:
498     fprintf(f, "this");
499     break;
500     /* jsscan.h mentions `super' ??? */
501     default:
502     abort();
503     }
504     break;
505     case TOK_INSTANCEOF:
506     instrument_expression(node->pn_left, f);
507     fprintf(f, " instanceof ");
508     instrument_expression(node->pn_right, f);
509     break;
510     case TOK_IN:
511     instrument_expression(node->pn_left, f);
512     fprintf(f, " in ");
513     instrument_expression(node->pn_right, f);
514     break;
515     default:
516     fatal("unsupported node type in file %s: %d", file_id, node->pn_type);
517     }
518     }
519    
520     static void instrument_var_statement(JSParseNode * node, FILE * f, int indent) {
521     assert(node->pn_arity == PN_LIST);
522     fprintf(f, "%*s", indent, "");
523     fprintf(f, "var ");
524     for (struct JSParseNode * p = node->pn_u.list.head; p != NULL; p = p->pn_next) {
525     assert(p->pn_type == TOK_NAME);
526     assert(p->pn_arity == PN_NAME);
527     if (p != node->pn_head) {
528     fprintf(f, ", ");
529     }
530     print_string_atom(p->pn_atom, f);
531     if (p->pn_expr != NULL) {
532     fprintf(f, " = ");
533     instrument_expression(p->pn_expr, f);
534     }
535     }
536     }
537    
538     static void output_statement(JSParseNode * node, FILE * f, int indent) {
539     switch (node->pn_type) {
540     case TOK_FUNCTION:
541     instrument_function(node, f, indent);
542     break;
543     case TOK_LC:
544     assert(node->pn_arity == PN_LIST);
545     /*
546     fprintf(f, "{\n");
547     */
548     for (struct JSParseNode * p = node->pn_u.list.head; p != NULL; p = p->pn_next) {
549     instrument_statement(p, f, indent);
550     }
551     /*
552     fprintf(f, "%*s", indent, "");
553     fprintf(f, "}\n");
554     */
555     break;
556     case TOK_IF:
557     assert(node->pn_arity == PN_TERNARY);
558     fprintf(f, "%*s", indent, "");
559     fprintf(f, "if (");
560     instrument_expression(node->pn_kid1, f);
561     fprintf(f, ") {\n");
562     instrument_statement(node->pn_kid2, f, indent + 2);
563     fprintf(f, "%*s", indent, "");
564     fprintf(f, "}\n");
565     if (node->pn_kid3) {
566     fprintf(f, "%*s", indent, "");
567     fprintf(f, "else {\n");
568     instrument_statement(node->pn_kid3, f, indent + 2);
569     fprintf(f, "%*s", indent, "");
570     fprintf(f, "}\n");
571     }
572     break;
573     case TOK_SWITCH:
574     assert(node->pn_arity == PN_BINARY);
575     fprintf(f, "%*s", indent, "");
576     fprintf(f, "switch (");
577     instrument_expression(node->pn_left, f);
578     fprintf(f, ") {\n");
579     for (struct JSParseNode * p = node->pn_right->pn_head; p != NULL; p = p->pn_next) {
580     fprintf(f, "%*s", indent, "");
581     switch (p->pn_type) {
582     case TOK_CASE:
583     fprintf(f, "case ");
584     instrument_expression(p->pn_left, f);
585     fprintf(f, ":\n");
586     break;
587     case TOK_DEFAULT:
588     fprintf(f, "default:\n");
589     break;
590     default:
591     abort();
592     break;
593     }
594     instrument_statement(p->pn_right, f, indent + 2);
595     }
596     fprintf(f, "%*s", indent, "");
597     fprintf(f, "}\n");
598     break;
599     case TOK_CASE:
600     case TOK_DEFAULT:
601     abort();
602     break;
603     case TOK_WHILE:
604     assert(node->pn_arity == PN_BINARY);
605     fprintf(f, "%*s", indent, "");
606     fprintf(f, "while (");
607     instrument_expression(node->pn_left, f);
608     fprintf(f, ") {\n");
609     instrument_statement(node->pn_right, f, indent + 2);
610     fprintf(f, "}\n");
611     break;
612     case TOK_DO:
613     assert(node->pn_arity == PN_BINARY);
614     fprintf(f, "%*s", indent, "");
615     fprintf(f, "do {\n");
616     instrument_statement(node->pn_left, f, indent + 2);
617     fprintf(f, "}\n");
618     fprintf(f, "%*s", indent, "");
619     fprintf(f, "while (");
620     instrument_expression(node->pn_right, f);
621     fprintf(f, ");\n");
622     break;
623     case TOK_FOR:
624     assert(node->pn_arity == PN_BINARY);
625     fprintf(f, "%*s", indent, "");
626     fprintf(f, "for (");
627     switch (node->pn_left->pn_type) {
628     case TOK_IN:
629     /* for/in */
630     assert(node->pn_left->pn_arity == PN_BINARY);
631     switch (node->pn_left->pn_left->pn_type) {
632     case TOK_VAR:
633     instrument_var_statement(node->pn_left->pn_left, f, 0);
634     break;
635     case TOK_NAME:
636     instrument_expression(node->pn_left->pn_left, f);
637     break;
638     default:
639     /* this is undocumented: for (x.value in y) */
640     instrument_expression(node->pn_left->pn_left, f);
641     break;
642     /*
643     default:
644     fprintf(stderr, "unexpected node type: %d\n", node->pn_left->pn_left->pn_type);
645     abort();
646     break;
647     */
648     }
649     fprintf(f, " in ");
650     instrument_expression(node->pn_left->pn_right, f);
651     break;
652     case TOK_RESERVED:
653     /* for (;;) */
654     assert(node->pn_left->pn_arity == PN_TERNARY);
655     if (node->pn_left->pn_kid1) {
656     if (node->pn_left->pn_kid1->pn_type == TOK_VAR) {
657     instrument_var_statement(node->pn_left->pn_kid1, f, 0);
658     }
659     else {
660     instrument_expression(node->pn_left->pn_kid1, f);
661     }
662     }
663     fprintf(f, ";");
664     if (node->pn_left->pn_kid2) {
665     fputc(' ', f);
666     instrument_expression(node->pn_left->pn_kid2, f);
667     }
668     fprintf(f, ";");
669     if (node->pn_left->pn_kid3) {
670     fputc(' ', f);
671     instrument_expression(node->pn_left->pn_kid3, f);
672     }
673     break;
674     default:
675     abort();
676     break;
677     }
678     fprintf(f, ") {\n");
679     instrument_statement(node->pn_right, f, indent + 2);
680     fprintf(f, "}\n");
681     break;
682     case TOK_THROW:
683     assert(node->pn_arity == PN_UNARY);
684     fprintf(f, "%*s", indent, "");
685     fprintf(f, "throw ");
686     instrument_expression(node->pn_u.unary.kid, f);
687     fprintf(f, ";\n");
688     break;
689     case TOK_TRY:
690     fprintf(f, "%*s", indent, "");
691     fprintf(f, "try {\n");
692     instrument_statement(node->pn_kid1, f, indent + 2);
693     fprintf(f, "%*s", indent, "");
694     fprintf(f, "}\n");
695     {
696     for (JSParseNode * catch = node->pn_kid2; catch != NULL; catch = catch->pn_kid2) {
697     assert(catch->pn_type == TOK_CATCH);
698     fprintf(f, "%*s", indent, "");
699     fprintf(f, "catch (");
700     assert(catch->pn_kid1->pn_arity == PN_NAME);
701     print_string_atom(catch->pn_kid1->pn_atom, f);
702     if (catch->pn_kid1->pn_expr) {
703     fprintf(f, " if ");
704     instrument_expression(catch->pn_kid1->pn_expr, f);
705     }
706     fprintf(f, ") {\n");
707     instrument_statement(catch->pn_kid3, f, indent + 2);
708     fprintf(f, "%*s", indent, "");
709     fprintf(f, "}\n");
710     }
711     }
712     if (node->pn_kid3) {
713     fprintf(f, "%*s", indent, "");
714     fprintf(f, "finally {\n");
715     instrument_statement(node->pn_kid3, f, indent + 2);
716     fprintf(f, "%*s", indent, "");
717     fprintf(f, "}\n");
718     }
719     break;
720     case TOK_CATCH:
721     abort();
722     break;
723     case TOK_BREAK:
724     case TOK_CONTINUE:
725     assert(node->pn_arity == PN_NAME || node->pn_arity == PN_NULLARY);
726     fprintf(f, "%*s", indent, "");
727     fputs(node->pn_type == TOK_BREAK? "break": "continue", f);
728     JSAtom * atom = node->pn_u.name.atom;
729     if (atom != NULL) {
730     fputc(' ', f);
731     print_string_atom(node->pn_atom, f);
732     }
733     fprintf(f, ";\n");
734     break;
735     case TOK_WITH:
736     assert(node->pn_arity == PN_BINARY);
737     fprintf(f, "%*s", indent, "");
738     fprintf(f, "with (");
739     instrument_expression(node->pn_left, f);
740     fprintf(f, ") {\n");
741     instrument_statement(node->pn_right, f, indent + 2);
742     fprintf(f, "%*s", indent, "");
743     fprintf(f, "}\n");
744     break;
745     case TOK_VAR:
746     instrument_var_statement(node, f, indent);
747     fprintf(f, ";\n");
748     break;
749     case TOK_RETURN:
750     assert(node->pn_arity == PN_UNARY);
751     fprintf(f, "%*s", indent, "");
752     fprintf(f, "return");
753     if (node->pn_kid != NULL) {
754     fprintf(f, " ");
755     instrument_expression(node->pn_kid, f);
756     }
757     fprintf(f, ";\n");
758     break;
759     case TOK_SEMI:
760     assert(node->pn_arity == PN_UNARY);
761     fprintf(f, "%*s", indent, "");
762     if (node->pn_kid != NULL) {
763     instrument_expression(node->pn_kid, f);
764     }
765     fprintf(f, ";\n");
766     break;
767     case TOK_COLON:
768     assert(node->pn_arity == PN_NAME);
769     /*
770     This one is tricky: can't output instrumentation between the label and the
771     statement it's supposed to label ...
772     */
773     fprintf(f, "%*s", indent < 2? 0: indent - 2, "");
774     print_string_atom(node->pn_atom, f);
775     fprintf(f, ":\n");
776     /*
777     ... use output_statement instead of instrument_statement.
778     */
779     output_statement(node->pn_expr, f, indent);
780     break;
781     default:
782     fatal("unsupported node type in file %s: %d", file_id, node->pn_type);
783     }
784     }
785    
786     /*
787     See <Statements> in jsparse.h.
788     TOK_FUNCTION is handled as a statement and as an expression.
789     TOK_EXPORT, TOK_IMPORT are not handled.
790     */
791     static void instrument_statement(JSParseNode * node, FILE * f, int indent) {
792     if (node->pn_type != TOK_LC) {
793     int line = node->pn_pos.begin.lineno;
794     /* the root node has line number 0 */
795     if (line != 0) {
796     fprintf(f, "%*s", indent, "");
797     fprintf(f, "_$jscoverage['%s'][%d]++;\n", file_id, line);
798     lines[line - 1] = 1;
799     }
800     }
801     output_statement(node, f, indent);
802     }
803    
804 siliconforks 70 static void instrument_js_stream(const char * id, int line, FILE * input, FILE * output, const char * temporary_file_name) {
805 siliconforks 2 file_id = id;
806    
807     /* scan the javascript */
808     JSTokenStream * token_stream = js_NewFileTokenStream(context, NULL, input);
809     if (token_stream == NULL) {
810     fatal("cannot create token stream from file: %s", file_id);
811     }
812    
813     /* parse the javascript */
814     JSParseNode * node = js_ParseTokenStream(context, global, token_stream);
815     if (node == NULL) {
816     fatal("parse error in file: %s", file_id);
817     }
818     int num_lines = node->pn_pos.end.lineno;
819     lines = xmalloc(num_lines);
820     for (int i = 0; i < num_lines; i++) {
821     lines[i] = 0;
822     }
823    
824     /*
825     Create a temporary file - we can't write directly to the output because we
826     need to know the line number info first.
827     */
828 siliconforks 70 FILE * temporary = fopen(temporary_file_name, "w+");
829 siliconforks 2 if (temporary == NULL) {
830     fatal("cannot create temporary file for script: %s", file_id);
831     }
832    
833     /* write instrumented javascript to the temporary */
834     instrument_statement(node, temporary, 0);
835    
836     /* write line number info to the output */
837     fprintf(output, "/* automatically generated by JSCoverage - do not edit */\n");
838     fprintf(output, "if (! top._$jscoverage) {\n top._$jscoverage = {};\n}\n");
839     fprintf(output, "var _$jscoverage = top._$jscoverage;\n");
840     fprintf(output, "if (! _$jscoverage['%s']) {\n", file_id);
841     fprintf(output, " _$jscoverage['%s'] = [];\n", file_id);
842     for (int i = 0; i < num_lines; i++) {
843     if (lines[i]) {
844     fprintf(output, " _$jscoverage['%s'][%d] = 0;\n", file_id, i + 1);
845     }
846     }
847     fprintf(output, "}\n");
848     lines = NULL;
849    
850     /* copy the temporary to the output */
851     fseek(temporary, 0, SEEK_SET);
852     copy_stream(temporary, output);
853    
854     fclose(temporary);
855    
856     file_id = NULL;
857     }
858    
859 siliconforks 70 void jscoverage_instrument_js(const char * id, FILE * input, FILE * output, const char * temporary_file_name) {
860     instrument_js_stream(id, 0, input, output, temporary_file_name);
861 siliconforks 2 }

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