/[jscoverage]/trunk/instrument-js.cpp
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Contents of /trunk/instrument-js.cpp

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Revision 342 - (show annotations)
Fri Oct 24 16:15:04 2008 UTC (9 years, 11 months ago) by siliconforks
Original Path: trunk/instrument-js.c
File MIME type: text/plain
File size: 48513 byte(s)
Add support for the JS 1.7 `yield' keyword.
1 /*
2 instrument-js.c - JavaScript instrumentation routines
3 Copyright (C) 2007, 2008 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 <config.h>
21
22 #include "instrument-js.h"
23
24 #include <assert.h>
25 #include <stdlib.h>
26 #include <string.h>
27
28 #include <jsapi.h>
29 #include <jsarena.h>
30 #include <jsatom.h>
31 #include <jsexn.h>
32 #include <jsfun.h>
33 #include <jsinterp.h>
34 #include <jsiter.h>
35 #include <jsparse.h>
36 #include <jsregexp.h>
37 #include <jsscope.h>
38 #include <jsstr.h>
39
40 #include "encoding.h"
41 #include "global.h"
42 #include "highlight.h"
43 #include "resource-manager.h"
44 #include "util.h"
45
46 struct IfDirective {
47 const jschar * condition_start;
48 const jschar * condition_end;
49 uint16_t start_line;
50 uint16_t end_line;
51 struct IfDirective * next;
52 };
53
54 static bool * exclusive_directives = NULL;
55
56 static JSRuntime * runtime = NULL;
57 static JSContext * context = NULL;
58 static JSObject * global = NULL;
59 static JSVersion js_version = JSVERSION_ECMA_3;
60
61 /*
62 JSParseNode objects store line numbers starting from 1.
63 The lines array stores line numbers starting from 0.
64 */
65 static const char * file_id = NULL;
66 static char * lines = NULL;
67 static uint16_t num_lines = 0;
68
69 void jscoverage_set_js_version(const char * version) {
70 js_version = atoi(version);
71 }
72
73 void jscoverage_init(void) {
74 runtime = JS_NewRuntime(8L * 1024L * 1024L);
75 if (runtime == NULL) {
76 fatal("cannot create runtime");
77 }
78
79 context = JS_NewContext(runtime, 8192);
80 if (context == NULL) {
81 fatal("cannot create context");
82 }
83
84 JS_SetVersion(context, js_version);
85
86 global = JS_NewObject(context, NULL, NULL, NULL);
87 if (global == NULL) {
88 fatal("cannot create global object");
89 }
90
91 if (! JS_InitStandardClasses(context, global)) {
92 fatal("cannot initialize standard classes");
93 }
94 }
95
96 void jscoverage_cleanup(void) {
97 JS_DestroyContext(context);
98 JS_DestroyRuntime(runtime);
99 }
100
101 static void print_javascript(const jschar * characters, size_t num_characters, Stream * f) {
102 for (size_t i = 0; i < num_characters; i++) {
103 jschar c = characters[i];
104 /*
105 XXX does not handle no-break space, other unicode "space separator"
106 */
107 switch (c) {
108 case 0x9:
109 case 0xB:
110 case 0xC:
111 Stream_write_char(f, c);
112 break;
113 default:
114 if (32 <= c && c <= 126) {
115 Stream_write_char(f, c);
116 }
117 else {
118 Stream_printf(f, "\\u%04x", c);
119 }
120 break;
121 }
122 }
123 }
124
125 static void print_string(JSString * s, Stream * f) {
126 size_t length = JSSTRING_LENGTH(s);
127 jschar * characters = JSSTRING_CHARS(s);
128 for (size_t i = 0; i < length; i++) {
129 jschar c = characters[i];
130 if (32 <= c && c <= 126) {
131 switch (c) {
132 case '"':
133 Stream_write_string(f, "\\\"");
134 break;
135 /*
136 case '\'':
137 Stream_write_string(f, "\\'");
138 break;
139 */
140 case '\\':
141 Stream_write_string(f, "\\\\");
142 break;
143 default:
144 Stream_write_char(f, c);
145 break;
146 }
147 }
148 else {
149 switch (c) {
150 case 0x8:
151 Stream_write_string(f, "\\b");
152 break;
153 case 0x9:
154 Stream_write_string(f, "\\t");
155 break;
156 case 0xa:
157 Stream_write_string(f, "\\n");
158 break;
159 /* IE doesn't support this */
160 /*
161 case 0xb:
162 Stream_write_string(f, "\\v");
163 break;
164 */
165 case 0xc:
166 Stream_write_string(f, "\\f");
167 break;
168 case 0xd:
169 Stream_write_string(f, "\\r");
170 break;
171 default:
172 Stream_printf(f, "\\u%04x", c);
173 break;
174 }
175 }
176 }
177 }
178
179 static void print_string_atom(JSAtom * atom, Stream * f) {
180 assert(ATOM_IS_STRING(atom));
181 JSString * s = ATOM_TO_STRING(atom);
182 print_string(s, f);
183 }
184
185 static void print_regex(jsval value, Stream * f) {
186 assert(JSVAL_IS_STRING(value));
187 JSString * s = JSVAL_TO_STRING(value);
188 size_t length = JSSTRING_LENGTH(s);
189 jschar * characters = JSSTRING_CHARS(s);
190 for (size_t i = 0; i < length; i++) {
191 jschar c = characters[i];
192 if (32 <= c && c <= 126) {
193 Stream_write_char(f, c);
194 }
195 else {
196 Stream_printf(f, "\\u%04x", c);
197 }
198 }
199 }
200
201 static void print_quoted_string_atom(JSAtom * atom, Stream * f) {
202 assert(ATOM_IS_STRING(atom));
203 JSString * s = ATOM_TO_STRING(atom);
204 Stream_write_char(f, '"');
205 print_string(s, f);
206 Stream_write_char(f, '"');
207 }
208
209 static const char * get_op(uint8 op) {
210 switch(op) {
211 case JSOP_OR:
212 return "||";
213 case JSOP_AND:
214 return "&&";
215 case JSOP_BITOR:
216 return "|";
217 case JSOP_BITXOR:
218 return "^";
219 case JSOP_BITAND:
220 return "&";
221 case JSOP_EQ:
222 return "==";
223 case JSOP_NE:
224 return "!=";
225 case JSOP_STRICTEQ:
226 return "===";
227 case JSOP_STRICTNE:
228 return "!==";
229 case JSOP_LT:
230 return "<";
231 case JSOP_LE:
232 return "<=";
233 case JSOP_GT:
234 return ">";
235 case JSOP_GE:
236 return ">=";
237 case JSOP_LSH:
238 return "<<";
239 case JSOP_RSH:
240 return ">>";
241 case JSOP_URSH:
242 return ">>>";
243 case JSOP_ADD:
244 return "+";
245 case JSOP_SUB:
246 return "-";
247 case JSOP_MUL:
248 return "*";
249 case JSOP_DIV:
250 return "/";
251 case JSOP_MOD:
252 return "%";
253 default:
254 abort();
255 }
256 }
257
258 static void instrument_expression(JSParseNode * node, Stream * f);
259 static void instrument_statement(JSParseNode * node, Stream * f, int indent, bool is_jscoverage_if);
260
261 enum FunctionType {
262 FUNCTION_NORMAL,
263 FUNCTION_GETTER_OR_SETTER
264 };
265
266 static void instrument_function(JSParseNode * node, Stream * f, int indent, enum FunctionType type) {
267 assert(node->pn_type == TOK_FUNCTION);
268 assert(node->pn_arity == PN_FUNC);
269 JSObject * object = node->pn_funpob->object;
270 assert(JS_ObjectIsFunction(context, object));
271 JSFunction * function = (JSFunction *) JS_GetPrivate(context, object);
272 assert(function);
273 assert(object == &function->object);
274 Stream_printf(f, "%*s", indent, "");
275 if (type == FUNCTION_NORMAL) {
276 Stream_write_string(f, "function");
277 }
278
279 /* function name */
280 if (function->atom) {
281 Stream_write_char(f, ' ');
282 print_string_atom(function->atom, f);
283 }
284
285 /*
286 function parameters - see JS_DecompileFunction in jsapi.cpp, which calls
287 js_DecompileFunction in jsopcode.cpp
288 */
289 Stream_write_string(f, "(");
290 JSArenaPool pool;
291 JS_INIT_ARENA_POOL(&pool, "instrument_function", 256, 1, &context->scriptStackQuota);
292 jsuword * local_names = NULL;
293 if (JS_GET_LOCAL_NAME_COUNT(function)) {
294 local_names = js_GetLocalNameArray(context, function, &pool);
295 if (local_names == NULL) {
296 fatal("out of memory");
297 }
298 }
299 for (int i = 0; i < function->nargs; i++) {
300 if (i > 0) {
301 Stream_write_string(f, ", ");
302 }
303 JSAtom * param = JS_LOCAL_NAME_TO_ATOM(local_names[i]);
304 print_string_atom(param, f);
305 }
306 JS_FinishArenaPool(&pool);
307 Stream_write_string(f, ") {\n");
308
309 /* function body */
310 instrument_statement(node->pn_body, f, indent + 2, false);
311
312 Stream_write_string(f, "}\n");
313 }
314
315 static void instrument_function_call(JSParseNode * node, Stream * f) {
316 instrument_expression(node->pn_head, f);
317 Stream_write_char(f, '(');
318 for (struct JSParseNode * p = node->pn_head->pn_next; p != NULL; p = p->pn_next) {
319 if (p != node->pn_head->pn_next) {
320 Stream_write_string(f, ", ");
321 }
322 instrument_expression(p, f);
323 }
324 Stream_write_char(f, ')');
325 }
326
327 static void instrument_declarations(JSParseNode * list, Stream * f) {
328 assert(list->pn_arity == PN_LIST);
329 for (JSParseNode * p = list->pn_head; p != NULL; p = p->pn_next) {
330 switch (p->pn_type) {
331 case TOK_NAME:
332 assert(p->pn_arity == PN_NAME);
333 if (p != list->pn_head) {
334 Stream_write_string(f, ", ");
335 }
336 print_string_atom(p->pn_atom, f);
337 if (p->pn_expr != NULL) {
338 Stream_write_string(f, " = ");
339 instrument_expression(p->pn_expr, f);
340 }
341 break;
342 case TOK_ASSIGN:
343 case TOK_RB:
344 case TOK_RC:
345 /* destructuring */
346 instrument_expression(p, f);
347 break;
348 default:
349 abort();
350 break;
351 }
352 }
353 }
354
355 /*
356 See <Expressions> in jsparse.h.
357 TOK_FUNCTION is handled as a statement and as an expression.
358 TOK_DBLDOT is not handled (XML op).
359 TOK_DEFSHARP and TOK_USESHARP are not handled.
360 TOK_ANYNAME is not handled (XML op).
361 TOK_AT is not handled (XML op).
362 TOK_DBLCOLON is not handled.
363 TOK_XML* are not handled.
364 There seem to be some undocumented expressions:
365 TOK_INSTANCEOF binary
366 TOK_IN binary
367 */
368 static void instrument_expression(JSParseNode * node, Stream * f) {
369 switch (node->pn_type) {
370 case TOK_FUNCTION:
371 instrument_function(node, f, 0, FUNCTION_NORMAL);
372 break;
373 case TOK_COMMA:
374 for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
375 if (p != node->pn_head) {
376 Stream_write_string(f, ", ");
377 }
378 instrument_expression(p, f);
379 }
380 break;
381 case TOK_ASSIGN:
382 instrument_expression(node->pn_left, f);
383 Stream_write_char(f, ' ');
384 switch (node->pn_op) {
385 case JSOP_ADD:
386 case JSOP_SUB:
387 case JSOP_MUL:
388 case JSOP_MOD:
389 case JSOP_LSH:
390 case JSOP_RSH:
391 case JSOP_URSH:
392 case JSOP_BITAND:
393 case JSOP_BITOR:
394 case JSOP_BITXOR:
395 case JSOP_DIV:
396 Stream_printf(f, "%s", get_op(node->pn_op));
397 break;
398 default:
399 /* do nothing - it must be a simple assignment */
400 break;
401 }
402 Stream_write_string(f, "= ");
403 instrument_expression(node->pn_right, f);
404 break;
405 case TOK_HOOK:
406 instrument_expression(node->pn_kid1, f);
407 Stream_write_string(f, "? ");
408 instrument_expression(node->pn_kid2, f);
409 Stream_write_string(f, ": ");
410 instrument_expression(node->pn_kid3, f);
411 break;
412 case TOK_OR:
413 case TOK_AND:
414 case TOK_BITOR:
415 case TOK_BITXOR:
416 case TOK_BITAND:
417 case TOK_EQOP:
418 case TOK_RELOP:
419 case TOK_SHOP:
420 case TOK_PLUS:
421 case TOK_MINUS:
422 case TOK_STAR:
423 case TOK_DIVOP:
424 switch (node->pn_arity) {
425 case PN_BINARY:
426 instrument_expression(node->pn_left, f);
427 Stream_printf(f, " %s ", get_op(node->pn_op));
428 instrument_expression(node->pn_right, f);
429 break;
430 case PN_LIST:
431 for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
432 if (p != node->pn_head) {
433 Stream_printf(f, " %s ", get_op(node->pn_op));
434 }
435 instrument_expression(p, f);
436 }
437 break;
438 default:
439 abort();
440 }
441 break;
442 case TOK_UNARYOP:
443 switch (node->pn_op) {
444 case JSOP_NEG:
445 Stream_write_char(f, '-');
446 instrument_expression(node->pn_kid, f);
447 break;
448 case JSOP_POS:
449 Stream_write_char(f, '+');
450 instrument_expression(node->pn_kid, f);
451 break;
452 case JSOP_NOT:
453 Stream_write_char(f, '!');
454 instrument_expression(node->pn_kid, f);
455 break;
456 case JSOP_BITNOT:
457 Stream_write_char(f, '~');
458 instrument_expression(node->pn_kid, f);
459 break;
460 case JSOP_TYPEOF:
461 Stream_write_string(f, "typeof ");
462 instrument_expression(node->pn_kid, f);
463 break;
464 case JSOP_VOID:
465 Stream_write_string(f, "void ");
466 instrument_expression(node->pn_kid, f);
467 break;
468 default:
469 abort();
470 break;
471 }
472 break;
473 case TOK_INC:
474 case TOK_DEC:
475 /*
476 This is not documented, but node->pn_op tells whether it is pre- or post-increment.
477 */
478 switch (node->pn_op) {
479 case JSOP_INCNAME:
480 case JSOP_INCPROP:
481 case JSOP_INCELEM:
482 Stream_write_string(f, "++");
483 instrument_expression(node->pn_kid, f);
484 break;
485 case JSOP_DECNAME:
486 case JSOP_DECPROP:
487 case JSOP_DECELEM:
488 Stream_write_string(f, "--");
489 instrument_expression(node->pn_kid, f);
490 break;
491 case JSOP_NAMEINC:
492 case JSOP_PROPINC:
493 case JSOP_ELEMINC:
494 instrument_expression(node->pn_kid, f);
495 Stream_write_string(f, "++");
496 break;
497 case JSOP_NAMEDEC:
498 case JSOP_PROPDEC:
499 case JSOP_ELEMDEC:
500 instrument_expression(node->pn_kid, f);
501 Stream_write_string(f, "--");
502 break;
503 default:
504 abort();
505 break;
506 }
507 break;
508 case TOK_NEW:
509 Stream_write_string(f, "new ");
510 instrument_function_call(node, f);
511 break;
512 case TOK_DELETE:
513 Stream_write_string(f, "delete ");
514 instrument_expression(node->pn_kid, f);
515 break;
516 case TOK_DOT:
517 /*
518 This may have originally been x['foo-bar']. Because the string 'foo-bar'
519 contains illegal characters, we have to use the subscript syntax instead of
520 the dot syntax.
521 */
522 instrument_expression(node->pn_expr, f);
523 assert(ATOM_IS_STRING(node->pn_atom));
524 {
525 JSString * s = ATOM_TO_STRING(node->pn_atom);
526 bool is_keyword = (js_CheckKeyword(JSSTRING_CHARS(s), JSSTRING_LENGTH(s)) != TOK_EOF);
527 if (! is_keyword && js_IsIdentifier(s)) {
528 Stream_write_char(f, '.');
529 print_string_atom(node->pn_atom, f);
530 }
531 else {
532 Stream_write_char(f, '[');
533 print_quoted_string_atom(node->pn_atom, f);
534 Stream_write_char(f, ']');
535 }
536 }
537 break;
538 case TOK_LB:
539 instrument_expression(node->pn_left, f);
540 Stream_write_char(f, '[');
541 instrument_expression(node->pn_right, f);
542 Stream_write_char(f, ']');
543 break;
544 case TOK_LP:
545 instrument_function_call(node, f);
546 break;
547 case TOK_RB:
548 Stream_write_char(f, '[');
549 for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
550 if (p != node->pn_head) {
551 Stream_write_string(f, ", ");
552 }
553 /* TOK_COMMA is a special case: a hole in the array */
554 if (p->pn_type != TOK_COMMA) {
555 instrument_expression(p, f);
556 }
557 }
558 if (node->pn_extra == PNX_ENDCOMMA) {
559 Stream_write_char(f, ',');
560 }
561 Stream_write_char(f, ']');
562 break;
563 case TOK_RC:
564 Stream_write_char(f, '{');
565 for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
566 assert(p->pn_type == TOK_COLON);
567 if (p != node->pn_head) {
568 Stream_write_string(f, ", ");
569 }
570
571 /* check whether this is a getter or setter */
572 switch (p->pn_op) {
573 case JSOP_GETTER:
574 case JSOP_SETTER:
575 if (p->pn_op == JSOP_GETTER) {
576 Stream_write_string(f, "get ");
577 }
578 else {
579 Stream_write_string(f, "set ");
580 }
581 instrument_expression(p->pn_left, f);
582 if (p->pn_right->pn_type != TOK_FUNCTION) {
583 fatal("parse error: expected function");
584 }
585 instrument_function(p->pn_right, f, 0, FUNCTION_GETTER_OR_SETTER);
586 break;
587 default:
588 instrument_expression(p->pn_left, f);
589 Stream_write_string(f, ": ");
590 instrument_expression(p->pn_right, f);
591 break;
592 }
593 }
594 Stream_write_char(f, '}');
595 break;
596 case TOK_RP:
597 Stream_write_char(f, '(');
598 instrument_expression(node->pn_kid, f);
599 Stream_write_char(f, ')');
600 break;
601 case TOK_NAME:
602 print_string_atom(node->pn_atom, f);
603 break;
604 case TOK_STRING:
605 print_quoted_string_atom(node->pn_atom, f);
606 break;
607 case TOK_REGEXP:
608 assert(node->pn_op == JSOP_REGEXP);
609 {
610 JSObject * object = node->pn_pob->object;
611 jsval result;
612 js_regexp_toString(context, object, &result);
613 print_regex(result, f);
614 }
615 break;
616 case TOK_NUMBER:
617 /*
618 A 64-bit IEEE 754 floating point number has a 52-bit fraction.
619 2^(-52) = 2.22 x 10^(-16)
620 Thus there are 16 significant digits.
621 To keep the output simple, special-case zero.
622 */
623 if (node->pn_dval == 0.0) {
624 Stream_write_string(f, "0");
625 }
626 else {
627 Stream_printf(f, "%.15g", node->pn_dval);
628 }
629 break;
630 case TOK_PRIMARY:
631 switch (node->pn_op) {
632 case JSOP_TRUE:
633 Stream_write_string(f, "true");
634 break;
635 case JSOP_FALSE:
636 Stream_write_string(f, "false");
637 break;
638 case JSOP_NULL:
639 Stream_write_string(f, "null");
640 break;
641 case JSOP_THIS:
642 Stream_write_string(f, "this");
643 break;
644 /* jsscan.h mentions `super' ??? */
645 default:
646 abort();
647 }
648 break;
649 case TOK_INSTANCEOF:
650 instrument_expression(node->pn_left, f);
651 Stream_write_string(f, " instanceof ");
652 instrument_expression(node->pn_right, f);
653 break;
654 case TOK_IN:
655 instrument_expression(node->pn_left, f);
656 Stream_write_string(f, " in ");
657 instrument_expression(node->pn_right, f);
658 break;
659 case TOK_LEXICALSCOPE:
660 assert(node->pn_arity == PN_NAME);
661 assert(node->pn_expr->pn_type == TOK_LET);
662 assert(node->pn_expr->pn_arity == PN_BINARY);
663 Stream_write_string(f, "let(");
664 assert(node->pn_expr->pn_left->pn_type == TOK_LP);
665 assert(node->pn_expr->pn_left->pn_arity == PN_LIST);
666 instrument_declarations(node->pn_expr->pn_left, f);
667 Stream_write_string(f, ") ");
668 instrument_expression(node->pn_expr->pn_right, f);
669 break;
670 case TOK_YIELD:
671 assert(node->pn_arity == PN_UNARY);
672 Stream_write_string(f, "yield ");
673 instrument_expression(node->pn_kid, f);
674 break;
675 default:
676 fatal("unsupported node type in file %s: %d", file_id, node->pn_type);
677 }
678 }
679
680 static void instrument_var_statement(JSParseNode * node, Stream * f, int indent) {
681 assert(node->pn_arity == PN_LIST);
682 Stream_printf(f, "%*s", indent, "");
683 Stream_write_string(f, "var ");
684 instrument_declarations(node, f);
685 }
686
687 static void instrument_let_definition(JSParseNode * node, Stream * f, int indent) {
688 assert(node->pn_arity == PN_LIST);
689 Stream_printf(f, "%*s", indent, "");
690 Stream_write_string(f, "let ");
691 instrument_declarations(node, f);
692 }
693
694 static void output_statement(JSParseNode * node, Stream * f, int indent, bool is_jscoverage_if) {
695 switch (node->pn_type) {
696 case TOK_FUNCTION:
697 instrument_function(node, f, indent, FUNCTION_NORMAL);
698 break;
699 case TOK_LC:
700 assert(node->pn_arity == PN_LIST);
701 /*
702 Stream_write_string(f, "{\n");
703 */
704 for (struct JSParseNode * p = node->pn_u.list.head; p != NULL; p = p->pn_next) {
705 instrument_statement(p, f, indent, false);
706 }
707 /*
708 Stream_printf(f, "%*s", indent, "");
709 Stream_write_string(f, "}\n");
710 */
711 break;
712 case TOK_IF:
713 {
714 assert(node->pn_arity == PN_TERNARY);
715
716 uint16_t line = node->pn_pos.begin.lineno;
717 if (! is_jscoverage_if) {
718 if (line > num_lines) {
719 fatal("%s: script contains more than 65,535 lines", file_id);
720 }
721 if (line >= 2 && exclusive_directives[line - 2]) {
722 is_jscoverage_if = true;
723 }
724 }
725
726 Stream_printf(f, "%*s", indent, "");
727 Stream_write_string(f, "if (");
728 instrument_expression(node->pn_kid1, f);
729 Stream_write_string(f, ") {\n");
730 if (is_jscoverage_if && node->pn_kid3) {
731 uint16_t else_start = node->pn_kid3->pn_pos.begin.lineno;
732 uint16_t else_end = node->pn_kid3->pn_pos.end.lineno + 1;
733 Stream_printf(f, "%*s", indent + 2, "");
734 Stream_printf(f, "_$jscoverage['%s'].conditionals[%d] = %d;\n", file_id, else_start, else_end);
735 }
736 instrument_statement(node->pn_kid2, f, indent + 2, false);
737 Stream_printf(f, "%*s", indent, "");
738 Stream_write_string(f, "}\n");
739
740 if (node->pn_kid3 || is_jscoverage_if) {
741 Stream_printf(f, "%*s", indent, "");
742 Stream_write_string(f, "else {\n");
743
744 if (is_jscoverage_if) {
745 uint16_t if_start = node->pn_kid2->pn_pos.begin.lineno + 1;
746 uint16_t if_end = node->pn_kid2->pn_pos.end.lineno + 1;
747 Stream_printf(f, "%*s", indent + 2, "");
748 Stream_printf(f, "_$jscoverage['%s'].conditionals[%d] = %d;\n", file_id, if_start, if_end);
749 }
750
751 if (node->pn_kid3) {
752 instrument_statement(node->pn_kid3, f, indent + 2, is_jscoverage_if);
753 }
754
755 Stream_printf(f, "%*s", indent, "");
756 Stream_write_string(f, "}\n");
757 }
758
759 break;
760 }
761 case TOK_SWITCH:
762 assert(node->pn_arity == PN_BINARY);
763 Stream_printf(f, "%*s", indent, "");
764 Stream_write_string(f, "switch (");
765 instrument_expression(node->pn_left, f);
766 Stream_write_string(f, ") {\n");
767 for (struct JSParseNode * p = node->pn_right->pn_head; p != NULL; p = p->pn_next) {
768 Stream_printf(f, "%*s", indent, "");
769 switch (p->pn_type) {
770 case TOK_CASE:
771 Stream_write_string(f, "case ");
772 instrument_expression(p->pn_left, f);
773 Stream_write_string(f, ":\n");
774 break;
775 case TOK_DEFAULT:
776 Stream_write_string(f, "default:\n");
777 break;
778 default:
779 abort();
780 break;
781 }
782 instrument_statement(p->pn_right, f, indent + 2, false);
783 }
784 Stream_printf(f, "%*s", indent, "");
785 Stream_write_string(f, "}\n");
786 break;
787 case TOK_CASE:
788 case TOK_DEFAULT:
789 abort();
790 break;
791 case TOK_WHILE:
792 assert(node->pn_arity == PN_BINARY);
793 Stream_printf(f, "%*s", indent, "");
794 Stream_write_string(f, "while (");
795 instrument_expression(node->pn_left, f);
796 Stream_write_string(f, ") {\n");
797 instrument_statement(node->pn_right, f, indent + 2, false);
798 Stream_write_string(f, "}\n");
799 break;
800 case TOK_DO:
801 assert(node->pn_arity == PN_BINARY);
802 Stream_printf(f, "%*s", indent, "");
803 Stream_write_string(f, "do {\n");
804 instrument_statement(node->pn_left, f, indent + 2, false);
805 Stream_write_string(f, "}\n");
806 Stream_printf(f, "%*s", indent, "");
807 Stream_write_string(f, "while (");
808 instrument_expression(node->pn_right, f);
809 Stream_write_string(f, ");\n");
810 break;
811 case TOK_FOR:
812 assert(node->pn_arity == PN_BINARY);
813 Stream_printf(f, "%*s", indent, "");
814 Stream_write_string(f, "for ");
815 if (node->pn_iflags & JSITER_FOREACH) {
816 Stream_write_string(f, "each ");
817 }
818 Stream_write_char(f, '(');
819 switch (node->pn_left->pn_type) {
820 case TOK_IN:
821 /* for/in */
822 assert(node->pn_left->pn_arity == PN_BINARY);
823 switch (node->pn_left->pn_left->pn_type) {
824 case TOK_VAR:
825 instrument_var_statement(node->pn_left->pn_left, f, 0);
826 break;
827 case TOK_LET:
828 instrument_let_definition(node->pn_left->pn_left, f, 0);
829 break;
830 case TOK_NAME:
831 instrument_expression(node->pn_left->pn_left, f);
832 break;
833 default:
834 /* this is undocumented: for (x.value in y) */
835 instrument_expression(node->pn_left->pn_left, f);
836 break;
837 /*
838 default:
839 fprintf(stderr, "unexpected node type: %d\n", node->pn_left->pn_left->pn_type);
840 abort();
841 break;
842 */
843 }
844 Stream_write_string(f, " in ");
845 instrument_expression(node->pn_left->pn_right, f);
846 break;
847 case TOK_RESERVED:
848 /* for (;;) */
849 assert(node->pn_left->pn_arity == PN_TERNARY);
850 if (node->pn_left->pn_kid1) {
851 switch (node->pn_left->pn_kid1->pn_type) {
852 case TOK_VAR:
853 instrument_var_statement(node->pn_left->pn_kid1, f, 0);
854 break;
855 case TOK_LET:
856 instrument_let_definition(node->pn_left->pn_kid1, f, 0);
857 break;
858 default:
859 instrument_expression(node->pn_left->pn_kid1, f);
860 break;
861 }
862 }
863 Stream_write_string(f, ";");
864 if (node->pn_left->pn_kid2) {
865 Stream_write_char(f, ' ');
866 instrument_expression(node->pn_left->pn_kid2, f);
867 }
868 Stream_write_string(f, ";");
869 if (node->pn_left->pn_kid3) {
870 Stream_write_char(f, ' ');
871 instrument_expression(node->pn_left->pn_kid3, f);
872 }
873 break;
874 default:
875 abort();
876 break;
877 }
878 Stream_write_string(f, ") {\n");
879 instrument_statement(node->pn_right, f, indent + 2, false);
880 Stream_write_string(f, "}\n");
881 break;
882 case TOK_THROW:
883 assert(node->pn_arity == PN_UNARY);
884 Stream_printf(f, "%*s", indent, "");
885 Stream_write_string(f, "throw ");
886 instrument_expression(node->pn_u.unary.kid, f);
887 Stream_write_string(f, ";\n");
888 break;
889 case TOK_TRY:
890 Stream_printf(f, "%*s", indent, "");
891 Stream_write_string(f, "try {\n");
892 instrument_statement(node->pn_kid1, f, indent + 2, false);
893 Stream_printf(f, "%*s", indent, "");
894 Stream_write_string(f, "}\n");
895 if (node->pn_kid2) {
896 assert(node->pn_kid2->pn_type == TOK_RESERVED);
897 for (JSParseNode * scope = node->pn_kid2->pn_head; scope != NULL; scope = scope->pn_next) {
898 assert(scope->pn_type == TOK_LEXICALSCOPE);
899 JSParseNode * catch = scope->pn_expr;
900 assert(catch->pn_type == TOK_CATCH);
901 Stream_printf(f, "%*s", indent, "");
902 Stream_write_string(f, "catch (");
903 /* this may not be a name - destructuring assignment */
904 /*
905 assert(catch->pn_kid1->pn_arity == PN_NAME);
906 print_string_atom(catch->pn_kid1->pn_atom, f);
907 */
908 instrument_expression(catch->pn_kid1, f);
909 if (catch->pn_kid2) {
910 Stream_write_string(f, " if ");
911 instrument_expression(catch->pn_kid2, f);
912 }
913 Stream_write_string(f, ") {\n");
914 instrument_statement(catch->pn_kid3, f, indent + 2, false);
915 Stream_printf(f, "%*s", indent, "");
916 Stream_write_string(f, "}\n");
917 }
918 }
919 if (node->pn_kid3) {
920 Stream_printf(f, "%*s", indent, "");
921 Stream_write_string(f, "finally {\n");
922 instrument_statement(node->pn_kid3, f, indent + 2, false);
923 Stream_printf(f, "%*s", indent, "");
924 Stream_write_string(f, "}\n");
925 }
926 break;
927 case TOK_CATCH:
928 abort();
929 break;
930 case TOK_BREAK:
931 case TOK_CONTINUE:
932 assert(node->pn_arity == PN_NAME || node->pn_arity == PN_NULLARY);
933 Stream_printf(f, "%*s", indent, "");
934 Stream_write_string(f, node->pn_type == TOK_BREAK? "break": "continue");
935 JSAtom * atom = node->pn_u.name.atom;
936 if (atom != NULL) {
937 Stream_write_char(f, ' ');
938 print_string_atom(node->pn_atom, f);
939 }
940 Stream_write_string(f, ";\n");
941 break;
942 case TOK_WITH:
943 assert(node->pn_arity == PN_BINARY);
944 Stream_printf(f, "%*s", indent, "");
945 Stream_write_string(f, "with (");
946 instrument_expression(node->pn_left, f);
947 Stream_write_string(f, ") {\n");
948 instrument_statement(node->pn_right, f, indent + 2, false);
949 Stream_printf(f, "%*s", indent, "");
950 Stream_write_string(f, "}\n");
951 break;
952 case TOK_VAR:
953 instrument_var_statement(node, f, indent);
954 Stream_write_string(f, ";\n");
955 break;
956 case TOK_RETURN:
957 assert(node->pn_arity == PN_UNARY);
958 Stream_printf(f, "%*s", indent, "");
959 Stream_write_string(f, "return");
960 if (node->pn_kid != NULL) {
961 Stream_write_char(f, ' ');
962 instrument_expression(node->pn_kid, f);
963 }
964 Stream_write_string(f, ";\n");
965 break;
966 case TOK_SEMI:
967 assert(node->pn_arity == PN_UNARY);
968 Stream_printf(f, "%*s", indent, "");
969 if (node->pn_kid != NULL) {
970 instrument_expression(node->pn_kid, f);
971 }
972 Stream_write_string(f, ";\n");
973 break;
974 case TOK_COLON:
975 assert(node->pn_arity == PN_NAME);
976 /*
977 This one is tricky: can't output instrumentation between the label and the
978 statement it's supposed to label ...
979 */
980 Stream_printf(f, "%*s", indent < 2? 0: indent - 2, "");
981 print_string_atom(node->pn_atom, f);
982 Stream_write_string(f, ":\n");
983 /*
984 ... use output_statement instead of instrument_statement.
985 */
986 output_statement(node->pn_expr, f, indent, false);
987 break;
988 case TOK_LEXICALSCOPE:
989 /* let statement */
990 assert(node->pn_arity == PN_NAME);
991 switch (node->pn_expr->pn_type) {
992 case TOK_LET:
993 /* let statement */
994 assert(node->pn_expr->pn_arity == PN_BINARY);
995 instrument_statement(node->pn_expr, f, indent, false);
996 break;
997 case TOK_LC:
998 /* block */
999 Stream_printf(f, "%*s", indent, "");
1000 Stream_write_string(f, "{\n");
1001 instrument_statement(node->pn_expr, f, indent + 2, false);
1002 Stream_printf(f, "%*s", indent, "");
1003 Stream_write_string(f, "}\n");
1004 break;
1005 case TOK_FOR:
1006 instrument_statement(node->pn_expr, f, indent, false);
1007 break;
1008 default:
1009 abort();
1010 break;
1011 }
1012 break;
1013 case TOK_LET:
1014 switch (node->pn_arity) {
1015 case PN_BINARY:
1016 /* let statement */
1017 Stream_printf(f, "%*s", indent, "");
1018 Stream_write_string(f, "let (");
1019 assert(node->pn_left->pn_type == TOK_LP);
1020 assert(node->pn_left->pn_arity == PN_LIST);
1021 instrument_declarations(node->pn_left, f);
1022 Stream_write_string(f, ") {\n");
1023 instrument_statement(node->pn_right, f, indent + 2, false);
1024 Stream_printf(f, "%*s", indent, "");
1025 Stream_write_string(f, "}\n");
1026 break;
1027 case PN_LIST:
1028 /* let definition */
1029 instrument_let_definition(node, f, indent);
1030 Stream_write_string(f, ";\n");
1031 break;
1032 default:
1033 abort();
1034 break;
1035 }
1036 break;
1037 default:
1038 fatal("unsupported node type in file %s: %d", file_id, node->pn_type);
1039 }
1040 }
1041
1042 /*
1043 See <Statements> in jsparse.h.
1044 TOK_FUNCTION is handled as a statement and as an expression.
1045 TOK_EXPORT, TOK_IMPORT are not handled.
1046 */
1047 static void instrument_statement(JSParseNode * node, Stream * f, int indent, bool is_jscoverage_if) {
1048 if (node->pn_type != TOK_LC && node->pn_type != TOK_LEXICALSCOPE) {
1049 uint16_t line = node->pn_pos.begin.lineno;
1050 if (line > num_lines) {
1051 fatal("%s: script contains more than 65,535 lines", file_id);
1052 }
1053
1054 /* the root node has line number 0 */
1055 if (line != 0) {
1056 Stream_printf(f, "%*s", indent, "");
1057 Stream_printf(f, "_$jscoverage['%s'][%d]++;\n", file_id, line);
1058 lines[line - 1] = 1;
1059 }
1060 }
1061 output_statement(node, f, indent, is_jscoverage_if);
1062 }
1063
1064 static bool characters_start_with(const jschar * characters, size_t line_start, size_t line_end, const char * prefix) {
1065 const jschar * characters_end = characters + line_end;
1066 const jschar * cp = characters + line_start;
1067 const char * bp = prefix;
1068 for (;;) {
1069 if (*bp == '\0') {
1070 return true;
1071 }
1072 else if (cp == characters_end) {
1073 return false;
1074 }
1075 else if (*cp != *bp) {
1076 return false;
1077 }
1078 bp++;
1079 cp++;
1080 }
1081 }
1082
1083 static bool characters_are_white_space(const jschar * characters, size_t line_start, size_t line_end) {
1084 /* XXX - other Unicode space */
1085 const jschar * end = characters + line_end;
1086 for (const jschar * p = characters + line_start; p < end; p++) {
1087 jschar c = *p;
1088 if (c == 0x9 || c == 0xB || c == 0xC || c == 0x20 || c == 0xA0) {
1089 continue;
1090 }
1091 else {
1092 return false;
1093 }
1094 }
1095 return true;
1096 }
1097
1098 static void error_reporter(JSContext * context, const char * message, JSErrorReport * report) {
1099 fprintf(stderr, "jscoverage: parse error: line %u: %s\n", report->lineno, message);
1100 }
1101
1102 void jscoverage_instrument_js(const char * id, const uint16_t * characters, size_t num_characters, Stream * output) {
1103 file_id = id;
1104
1105 /* parse the javascript */
1106 JSParseContext parse_context;
1107 if (! js_InitParseContext(context, &parse_context, NULL, NULL, characters, num_characters, NULL, NULL, 1)) {
1108 fatal("cannot create token stream from file: %s", file_id);
1109 }
1110 JSErrorReporter old_error_reporter = JS_SetErrorReporter(context, error_reporter);
1111 JSParseNode * node = js_ParseScript(context, global, &parse_context);
1112 if (node == NULL) {
1113 js_ReportUncaughtException(context);
1114 fatal("parse error in file: %s", file_id);
1115 }
1116 JS_SetErrorReporter(context, old_error_reporter);
1117 num_lines = node->pn_pos.end.lineno;
1118 lines = xmalloc(num_lines);
1119 for (unsigned int i = 0; i < num_lines; i++) {
1120 lines[i] = 0;
1121 }
1122
1123 /* search code for conditionals */
1124 exclusive_directives = xnew(bool, num_lines);
1125 for (unsigned int i = 0; i < num_lines; i++) {
1126 exclusive_directives[i] = false;
1127 }
1128
1129 bool has_conditionals = false;
1130 struct IfDirective * if_directives = NULL;
1131 size_t line_number = 0;
1132 size_t i = 0;
1133 while (i < num_characters) {
1134 if (line_number == UINT16_MAX) {
1135 fatal("%s: script has more than 65,535 lines", file_id);
1136 }
1137 line_number++;
1138 size_t line_start = i;
1139 jschar c;
1140 bool done = false;
1141 while (! done && i < num_characters) {
1142 c = characters[i];
1143 switch (c) {
1144 case '\r':
1145 case '\n':
1146 case 0x2028:
1147 case 0x2029:
1148 done = true;
1149 break;
1150 default:
1151 i++;
1152 }
1153 }
1154 size_t line_end = i;
1155 if (i < num_characters) {
1156 i++;
1157 if (c == '\r' && i < num_characters && characters[i] == '\n') {
1158 i++;
1159 }
1160 }
1161
1162 if (characters_start_with(characters, line_start, line_end, "//#JSCOVERAGE_IF")) {
1163 has_conditionals = true;
1164
1165 if (characters_are_white_space(characters, line_start + 16, line_end)) {
1166 exclusive_directives[line_number - 1] = true;
1167 }
1168 else {
1169 struct IfDirective * if_directive = xnew(struct IfDirective, 1);
1170 if_directive->condition_start = characters + line_start + 16;
1171 if_directive->condition_end = characters + line_end;
1172 if_directive->start_line = line_number;
1173 if_directive->end_line = 0;
1174 if_directive->next = if_directives;
1175 if_directives = if_directive;
1176 }
1177 }
1178 else if (characters_start_with(characters, line_start, line_end, "//#JSCOVERAGE_ENDIF")) {
1179 for (struct IfDirective * p = if_directives; p != NULL; p = p->next) {
1180 if (p->end_line == 0) {
1181 p->end_line = line_number;
1182 break;
1183 }
1184 }
1185 }
1186 }
1187
1188 /*
1189 An instrumented JavaScript file has 4 sections:
1190 1. initialization
1191 2. instrumented source code
1192 3. conditionals
1193 4. original source code
1194 */
1195
1196 Stream * instrumented = Stream_new(0);
1197 instrument_statement(node, instrumented, 0, false);
1198 js_FinishParseContext(context, &parse_context);
1199
1200 /* write line number info to the output */
1201 Stream_write_string(output, "/* automatically generated by JSCoverage - do not edit */\n");
1202 Stream_write_string(output, "if (! top._$jscoverage) {\n top._$jscoverage = {};\n}\n");
1203 Stream_write_string(output, "var _$jscoverage = top._$jscoverage;\n");
1204 Stream_printf(output, "if (! _$jscoverage['%s']) {\n", file_id);
1205 Stream_printf(output, " _$jscoverage['%s'] = [];\n", file_id);
1206 for (int i = 0; i < num_lines; i++) {
1207 if (lines[i]) {
1208 Stream_printf(output, " _$jscoverage['%s'][%d] = 0;\n", file_id, i + 1);
1209 }
1210 }
1211 Stream_write_string(output, "}\n");
1212 free(lines);
1213 lines = NULL;
1214 free(exclusive_directives);
1215 exclusive_directives = NULL;
1216
1217 /* conditionals */
1218 if (has_conditionals) {
1219 Stream_printf(output, "_$jscoverage['%s'].conditionals = [];\n", file_id);
1220 }
1221
1222 /* copy the instrumented source code to the output */
1223 Stream_write(output, instrumented->data, instrumented->length);
1224
1225 /* conditionals */
1226 for (struct IfDirective * if_directive = if_directives; if_directive != NULL; if_directive = if_directive->next) {
1227 Stream_write_string(output, "if (!(");
1228 print_javascript(if_directive->condition_start, if_directive->condition_end - if_directive->condition_start, output);
1229 Stream_write_string(output, ")) {\n");
1230 Stream_printf(output, " _$jscoverage['%s'].conditionals[%d] = %d;\n", file_id, if_directive->start_line, if_directive->end_line);
1231 Stream_write_string(output, "}\n");
1232 }
1233
1234 /* free */
1235 while (if_directives != NULL) {
1236 struct IfDirective * if_directive = if_directives;
1237 if_directives = if_directives->next;
1238 free(if_directive);
1239 }
1240
1241 /* copy the original source to the output */
1242 Stream_printf(output, "_$jscoverage['%s'].source = ", file_id);
1243 jscoverage_write_source(id, characters, num_characters, output);
1244 Stream_printf(output, ";\n");
1245
1246 Stream_delete(instrumented);
1247
1248 file_id = NULL;
1249 }
1250
1251 void jscoverage_write_source(const char * id, const jschar * characters, size_t num_characters, Stream * output) {
1252 Stream_write_string(output, "[");
1253 if (jscoverage_highlight) {
1254 Stream * highlighted_stream = Stream_new(num_characters);
1255 jscoverage_highlight_js(context, id, characters, num_characters, highlighted_stream);
1256 size_t i = 0;
1257 while (i < highlighted_stream->length) {
1258 if (i > 0) {
1259 Stream_write_char(output, ',');
1260 }
1261
1262 Stream_write_char(output, '"');
1263 bool done = false;
1264 while (! done) {
1265 char c = highlighted_stream->data[i];
1266 switch (c) {
1267 case 0x8:
1268 /* backspace */
1269 Stream_write_string(output, "\\b");
1270 break;
1271 case 0x9:
1272 /* horizontal tab */
1273 Stream_write_string(output, "\\t");
1274 break;
1275 case 0xa:
1276 /* line feed (new line) */
1277 done = true;
1278 break;
1279 /* IE doesn't support this */
1280 /*
1281 case 0xb:
1282 Stream_write_string(output, "\\v");
1283 break;
1284 */
1285 case 0xc:
1286 /* form feed */
1287 Stream_write_string(output, "\\f");
1288 break;
1289 case 0xd:
1290 /* carriage return */
1291 done = true;
1292 if (i + 1 < highlighted_stream->length && highlighted_stream->data[i + 1] == '\n') {
1293 i++;
1294 }
1295 break;
1296 case '"':
1297 Stream_write_string(output, "\\\"");
1298 break;
1299 case '\\':
1300 Stream_write_string(output, "\\\\");
1301 break;
1302 default:
1303 Stream_write_char(output, c);
1304 break;
1305 }
1306 i++;
1307 if (i >= highlighted_stream->length) {
1308 done = true;
1309 }
1310 }
1311 Stream_write_char(output, '"');
1312 }
1313 Stream_delete(highlighted_stream);
1314 }
1315 else {
1316 size_t i = 0;
1317 while (i < num_characters) {
1318 if (i > 0) {
1319 Stream_write_char(output, ',');
1320 }
1321
1322 Stream_write_char(output, '"');
1323 bool done = false;
1324 while (! done) {
1325 jschar c = characters[i];
1326 switch (c) {
1327 case 0x8:
1328 /* backspace */
1329 Stream_write_string(output, "\\b");
1330 break;
1331 case 0x9:
1332 /* horizontal tab */
1333 Stream_write_string(output, "\\t");
1334 break;
1335 case 0xa:
1336 /* line feed (new line) */
1337 done = true;
1338 break;
1339 /* IE doesn't support this */
1340 /*
1341 case 0xb:
1342 Stream_write_string(output, "\\v");
1343 break;
1344 */
1345 case 0xc:
1346 /* form feed */
1347 Stream_write_string(output, "\\f");
1348 break;
1349 case 0xd:
1350 /* carriage return */
1351 done = true;
1352 if (i + 1 < num_characters && characters[i + 1] == '\n') {
1353 i++;
1354 }
1355 break;
1356 case '"':
1357 Stream_write_string(output, "\\\"");
1358 break;
1359 case '\\':
1360 Stream_write_string(output, "\\\\");
1361 break;
1362 case '&':
1363 Stream_write_string(output, "&amp;");
1364 break;
1365 case '<':
1366 Stream_write_string(output, "&lt;");
1367 break;
1368 case '>':
1369 Stream_write_string(output, "&gt;");
1370 break;
1371 case 0x2028:
1372 case 0x2029:
1373 done = true;
1374 break;
1375 default:
1376 if (32 <= c && c <= 126) {
1377 Stream_write_char(output, c);
1378 }
1379 else {
1380 Stream_printf(output, "&#%d;", c);
1381 }
1382 break;
1383 }
1384 i++;
1385 if (i >= num_characters) {
1386 done = true;
1387 }
1388 }
1389 Stream_write_char(output, '"');
1390 }
1391 }
1392 Stream_write_string(output, "]");
1393 }
1394
1395 void jscoverage_copy_resources(const char * destination_directory) {
1396 copy_resource("jscoverage.html", destination_directory);
1397 copy_resource("jscoverage.css", destination_directory);
1398 copy_resource("jscoverage.js", destination_directory);
1399 copy_resource("jscoverage-ie.css", destination_directory);
1400 copy_resource("jscoverage-throbber.gif", destination_directory);
1401 copy_resource("jscoverage-highlight.css", destination_directory);
1402 }
1403
1404 /*
1405 coverage reports
1406 */
1407
1408 struct FileCoverageList {
1409 FileCoverage * file_coverage;
1410 struct FileCoverageList * next;
1411 };
1412
1413 struct Coverage {
1414 JSHashTable * coverage_table;
1415 struct FileCoverageList * coverage_list;
1416 };
1417
1418 static int compare_strings(const void * p1, const void * p2) {
1419 return strcmp(p1, p2) == 0;
1420 }
1421
1422 Coverage * Coverage_new(void) {
1423 Coverage * result = xmalloc(sizeof(Coverage));
1424 result->coverage_table = JS_NewHashTable(1024, JS_HashString, compare_strings, NULL, NULL, NULL);
1425 if (result->coverage_table == NULL) {
1426 fatal("cannot create hash table");
1427 }
1428 result->coverage_list = NULL;
1429 return result;
1430 }
1431
1432 void Coverage_delete(Coverage * coverage) {
1433 JS_HashTableDestroy(coverage->coverage_table);
1434 struct FileCoverageList * p = coverage->coverage_list;
1435 while (p != NULL) {
1436 free(p->file_coverage->coverage_lines);
1437 if (p->file_coverage->source_lines != NULL) {
1438 for (uint32 i = 0; i < p->file_coverage->num_source_lines; i++) {
1439 free(p->file_coverage->source_lines[i]);
1440 }
1441 free(p->file_coverage->source_lines);
1442 }
1443 free(p->file_coverage->id);
1444 free(p->file_coverage);
1445 struct FileCoverageList * q = p;
1446 p = p->next;
1447 free(q);
1448 }
1449 free(coverage);
1450 }
1451
1452 struct EnumeratorArg {
1453 CoverageForeachFunction f;
1454 void * p;
1455 };
1456
1457 static intN enumerator(JSHashEntry * entry, intN i, void * arg) {
1458 struct EnumeratorArg * enumerator_arg = arg;
1459 enumerator_arg->f(entry->value, i, enumerator_arg->p);
1460 return 0;
1461 }
1462
1463 void Coverage_foreach_file(Coverage * coverage, CoverageForeachFunction f, void * p) {
1464 struct EnumeratorArg enumerator_arg;
1465 enumerator_arg.f = f;
1466 enumerator_arg.p = p;
1467 JS_HashTableEnumerateEntries(coverage->coverage_table, enumerator, &enumerator_arg);
1468 }
1469
1470 int jscoverage_parse_json(Coverage * coverage, const uint8_t * json, size_t length) {
1471 int result = 0;
1472
1473 jschar * base = js_InflateString(context, (char *) json, &length);
1474 if (base == NULL) {
1475 fatal("out of memory");
1476 }
1477
1478 jschar * parenthesized_json = xnew(jschar, addst(length, 2));
1479 parenthesized_json[0] = '(';
1480 memcpy(parenthesized_json + 1, base, mulst(length, sizeof(jschar)));
1481 parenthesized_json[length + 1] = ')';
1482
1483 JS_free(context, base);
1484
1485 JSParseContext parse_context;
1486 if (! js_InitParseContext(context, &parse_context, NULL, NULL, parenthesized_json, length + 2, NULL, NULL, 1)) {
1487 free(parenthesized_json);
1488 return -1;
1489 }
1490 JSParseNode * root = js_ParseScript(context, global, &parse_context);
1491 free(parenthesized_json);
1492 if (root == NULL) {
1493 result = -1;
1494 goto done;
1495 }
1496
1497 /* root node must be TOK_LC */
1498 if (root->pn_type != TOK_LC) {
1499 result = -1;
1500 goto done;
1501 }
1502 JSParseNode * semi = root->pn_u.list.head;
1503
1504 /* the list must be TOK_SEMI and it must contain only one element */
1505 if (semi->pn_type != TOK_SEMI || semi->pn_next != NULL) {
1506 result = -1;
1507 goto done;
1508 }
1509 JSParseNode * parenthesized = semi->pn_kid;
1510
1511 /* this must be a parenthesized expression */
1512 if (parenthesized->pn_type != TOK_RP) {
1513 result = -1;
1514 goto done;
1515 }
1516 JSParseNode * object = parenthesized->pn_kid;
1517
1518 /* this must be an object literal */
1519 if (object->pn_type != TOK_RC) {
1520 result = -1;
1521 goto done;
1522 }
1523
1524 for (JSParseNode * p = object->pn_head; p != NULL; p = p->pn_next) {
1525 /* every element of this list must be TOK_COLON */
1526 if (p->pn_type != TOK_COLON) {
1527 result = -1;
1528 goto done;
1529 }
1530
1531 /* the key must be a string representing the file */
1532 JSParseNode * key = p->pn_left;
1533 if (key->pn_type != TOK_STRING || ! ATOM_IS_STRING(key->pn_atom)) {
1534 result = -1;
1535 goto done;
1536 }
1537 char * id_bytes = JS_GetStringBytes(ATOM_TO_STRING(key->pn_atom));
1538
1539 /* the value must be an object literal OR an array */
1540 JSParseNode * value = p->pn_right;
1541 if (! (value->pn_type == TOK_RC || value->pn_type == TOK_RB)) {
1542 result = -1;
1543 goto done;
1544 }
1545
1546 JSParseNode * array = NULL;
1547 JSParseNode * source = NULL;
1548 if (value->pn_type == TOK_RB) {
1549 /* an array */
1550 array = value;
1551 }
1552 else if (value->pn_type == TOK_RC) {
1553 /* an object literal */
1554 if (value->pn_count != 2) {
1555 result = -1;
1556 goto done;
1557 }
1558 for (JSParseNode * element = value->pn_head; element != NULL; element = element->pn_next) {
1559 if (element->pn_type != TOK_COLON) {
1560 result = -1;
1561 goto done;
1562 }
1563 JSParseNode * left = element->pn_left;
1564 if (left->pn_type != TOK_STRING || ! ATOM_IS_STRING(left->pn_atom)) {
1565 result = -1;
1566 goto done;
1567 }
1568 const char * s = JS_GetStringBytes(ATOM_TO_STRING(left->pn_atom));
1569 if (strcmp(s, "coverage") == 0) {
1570 array = element->pn_right;
1571 if (array->pn_type != TOK_RB) {
1572 result = -1;
1573 goto done;
1574 }
1575 }
1576 else if (strcmp(s, "source") == 0) {
1577 source = element->pn_right;
1578 if (source->pn_type != TOK_RB) {
1579 result = -1;
1580 goto done;
1581 }
1582 }
1583 else {
1584 result = -1;
1585 goto done;
1586 }
1587 }
1588 }
1589 else {
1590 result = -1;
1591 goto done;
1592 }
1593
1594 if (array == NULL) {
1595 result = -1;
1596 goto done;
1597 }
1598
1599 /* look up the file in the coverage table */
1600 FileCoverage * file_coverage = JS_HashTableLookup(coverage->coverage_table, id_bytes);
1601 if (file_coverage == NULL) {
1602 /* not there: create a new one */
1603 char * id = xstrdup(id_bytes);
1604 file_coverage = xmalloc(sizeof(FileCoverage));
1605 file_coverage->id = id;
1606 file_coverage->num_coverage_lines = array->pn_count;
1607 file_coverage->coverage_lines = xnew(int, array->pn_count);
1608 file_coverage->source_lines = NULL;
1609
1610 /* set coverage for all lines */
1611 uint32 i = 0;
1612 for (JSParseNode * element = array->pn_head; element != NULL; element = element->pn_next, i++) {
1613 if (element->pn_type == TOK_NUMBER) {
1614 file_coverage->coverage_lines[i] = (int) element->pn_dval;
1615 }
1616 else if (element->pn_type == TOK_PRIMARY && element->pn_op == JSOP_NULL) {
1617 file_coverage->coverage_lines[i] = -1;
1618 }
1619 else {
1620 result = -1;
1621 goto done;
1622 }
1623 }
1624 assert(i == array->pn_count);
1625
1626 /* add to the hash table */
1627 JS_HashTableAdd(coverage->coverage_table, id, file_coverage);
1628 struct FileCoverageList * coverage_list = xmalloc(sizeof(struct FileCoverageList));
1629 coverage_list->file_coverage = file_coverage;
1630 coverage_list->next = coverage->coverage_list;
1631 coverage->coverage_list = coverage_list;
1632 }
1633 else {
1634 /* sanity check */
1635 assert(strcmp(file_coverage->id, id_bytes) == 0);
1636 if (file_coverage->num_coverage_lines != array->pn_count) {
1637 result = -2;
1638 goto done;
1639 }
1640
1641 /* merge the coverage */
1642 uint32 i = 0;
1643 for (JSParseNode * element = array->pn_head; element != NULL; element = element->pn_next, i++) {
1644 if (element->pn_type == TOK_NUMBER) {
1645 if (file_coverage->coverage_lines[i] == -1) {
1646 result = -2;
1647 goto done;
1648 }
1649 file_coverage->coverage_lines[i] += (int) element->pn_dval;
1650 }
1651 else if (element->pn_type == TOK_PRIMARY && element->pn_op == JSOP_NULL) {
1652 if (file_coverage->coverage_lines[i] != -1) {
1653 result = -2;
1654 goto done;
1655 }
1656 }
1657 else {
1658 result = -1;
1659 goto done;
1660 }
1661 }
1662 assert(i == array->pn_count);
1663 }
1664
1665 /* if this JSON file has source, use it */
1666 if (file_coverage->source_lines == NULL && source != NULL) {
1667 file_coverage->num_source_lines = source->pn_count;
1668 file_coverage->source_lines = xnew(char *, source->pn_count);
1669 uint32 i = 0;
1670 for (JSParseNode * element = source->pn_head; element != NULL; element = element->pn_next, i++) {
1671 if (element->pn_type != TOK_STRING) {
1672 result = -1;
1673 goto done;
1674 }
1675 file_coverage->source_lines[i] = xstrdup(JS_GetStringBytes(ATOM_TO_STRING(element->pn_atom)));
1676 }
1677 assert(i == source->pn_count);
1678 }
1679 }
1680
1681 done:
1682 js_FinishParseContext(context, &parse_context);
1683 return result;
1684 }

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