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

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revision 343 by siliconforks, Fri Oct 24 16:15:25 2008 UTC revision 374 by siliconforks, Mon Oct 27 21:42:58 2008 UTC
# Line 28  Line 28 
28  #include <jsapi.h>  #include <jsapi.h>
29  #include <jsarena.h>  #include <jsarena.h>
30  #include <jsatom.h>  #include <jsatom.h>
31    #include <jsemit.h>
32  #include <jsexn.h>  #include <jsexn.h>
33  #include <jsfun.h>  #include <jsfun.h>
34  #include <jsinterp.h>  #include <jsinterp.h>
# Line 51  Line 52 
52    struct IfDirective * next;    struct IfDirective * next;
53  };  };
54    
55    bool jscoverage_mozilla = false;
56    
57  static bool * exclusive_directives = NULL;  static bool * exclusive_directives = NULL;
58    
59  static JSRuntime * runtime = NULL;  static JSRuntime * runtime = NULL;
# Line 67  Line 70 
70  static uint16_t num_lines = 0;  static uint16_t num_lines = 0;
71    
72  void jscoverage_set_js_version(const char * version) {  void jscoverage_set_js_version(const char * version) {
73    js_version = atoi(version);    js_version = JS_StringToVersion(version);
74      if (js_version != JSVERSION_UNKNOWN) {
75        return;
76      }
77    
78      char * end;
79      js_version = (JSVersion) strtol(version, &end, 10);
80      if ((size_t) (end - version) != strlen(version)) {
81        fatal("invalid version: %s", version);
82      }
83  }  }
84    
85  void jscoverage_init(void) {  void jscoverage_init(void) {
# Line 257  Line 269 
269    
270  static void instrument_expression(JSParseNode * node, Stream * f);  static void instrument_expression(JSParseNode * node, Stream * f);
271  static void instrument_statement(JSParseNode * node, Stream * f, int indent, bool is_jscoverage_if);  static void instrument_statement(JSParseNode * node, Stream * f, int indent, bool is_jscoverage_if);
272    static void output_statement(JSParseNode * node, Stream * f, int indent, bool is_jscoverage_if);
273    
274  enum FunctionType {  enum FunctionType {
275    FUNCTION_NORMAL,    FUNCTION_NORMAL,
276    FUNCTION_GETTER_OR_SETTER    FUNCTION_GETTER_OR_SETTER
277  };  };
278    
279    static void output_for_in(JSParseNode * node, Stream * f) {
280      assert(node->pn_type == TOK_FOR);
281      assert(node->pn_arity == PN_BINARY);
282      Stream_write_string(f, "for ");
283      if (node->pn_iflags & JSITER_FOREACH) {
284        Stream_write_string(f, "each ");
285      }
286      Stream_write_char(f, '(');
287      instrument_expression(node->pn_left, f);
288      Stream_write_char(f, ')');
289    }
290    
291    static void output_array_comprehension_or_generator_expression(JSParseNode * node, Stream * f) {
292      assert(node->pn_type == TOK_LEXICALSCOPE);
293      assert(node->pn_arity == PN_NAME);
294      JSParseNode * for_node = node->pn_expr;
295      assert(for_node->pn_type == TOK_FOR);
296      assert(for_node->pn_arity == PN_BINARY);
297      JSParseNode * p = for_node;
298      while (p->pn_type == TOK_FOR) {
299        p = p->pn_right;
300      }
301      JSParseNode * if_node = NULL;
302      if (p->pn_type == TOK_IF) {
303        if_node = p;
304        assert(if_node->pn_arity == PN_TERNARY);
305        p = if_node->pn_kid2;
306      }
307      assert(p->pn_arity == PN_UNARY);
308      p = p->pn_kid;
309      if (p->pn_type == TOK_YIELD) {
310        /* for generator expressions */
311        p = p->pn_kid;
312      }
313    
314      instrument_expression(p, f);
315      p = for_node;
316      while (p->pn_type == TOK_FOR) {
317        Stream_write_char(f, ' ');
318        output_for_in(p, f);
319        p = p->pn_right;
320      }
321      if (if_node) {
322        Stream_write_string(f, " if (");
323        instrument_expression(if_node->pn_kid1, f);
324        Stream_write_char(f, ')');
325      }
326    }
327    
328  static void instrument_function(JSParseNode * node, Stream * f, int indent, enum FunctionType type) {  static void instrument_function(JSParseNode * node, Stream * f, int indent, enum FunctionType type) {
329    assert(node->pn_type == TOK_FUNCTION);    assert(node->pn_type == TOK_FUNCTION);
330    assert(node->pn_arity == PN_FUNC);    assert(node->pn_arity == PN_FUNC);
# Line 273  Line 335 
335    assert(object == &function->object);    assert(object == &function->object);
336    Stream_printf(f, "%*s", indent, "");    Stream_printf(f, "%*s", indent, "");
337    if (type == FUNCTION_NORMAL) {    if (type == FUNCTION_NORMAL) {
338      Stream_write_string(f, "function");      Stream_write_string(f, "function ");
339    }    }
340    
341    /* function name */    /* function name */
342    if (function->atom) {    if (function->atom) {
     Stream_write_char(f, ' ');  
343      print_string_atom(function->atom, f);      print_string_atom(function->atom, f);
344    }    }
345    
# Line 286  Line 347 
347    function parameters - see JS_DecompileFunction in jsapi.cpp, which calls    function parameters - see JS_DecompileFunction in jsapi.cpp, which calls
348    js_DecompileFunction in jsopcode.cpp    js_DecompileFunction in jsopcode.cpp
349    */    */
350    Stream_write_string(f, "(");    Stream_write_char(f, '(');
351    JSArenaPool pool;    JSArenaPool pool;
352    JS_INIT_ARENA_POOL(&pool, "instrument_function", 256, 1, &context->scriptStackQuota);    JS_INIT_ARENA_POOL(&pool, "instrument_function", 256, 1, &context->scriptStackQuota);
353    jsuword * local_names = NULL;    jsuword * local_names = NULL;
# Line 296  Line 357 
357        fatal("out of memory");        fatal("out of memory");
358      }      }
359    }    }
360      bool destructuring = false;
361    for (int i = 0; i < function->nargs; i++) {    for (int i = 0; i < function->nargs; i++) {
362      if (i > 0) {      if (i > 0) {
363        Stream_write_string(f, ", ");        Stream_write_string(f, ", ");
364      }      }
365      JSAtom * param = JS_LOCAL_NAME_TO_ATOM(local_names[i]);      JSAtom * param = JS_LOCAL_NAME_TO_ATOM(local_names[i]);
366      print_string_atom(param, f);      if (param == NULL) {
367          destructuring = true;
368          JSParseNode * expression = NULL;
369          assert(node->pn_body->pn_type == TOK_LC || node->pn_body->pn_type == TOK_BODY);
370          JSParseNode * semi = node->pn_body->pn_head;
371          assert(semi->pn_type == TOK_SEMI);
372          JSParseNode * comma = semi->pn_kid;
373          assert(comma->pn_type == TOK_COMMA);
374          for (JSParseNode * p = comma->pn_head; p != NULL; p = p->pn_next) {
375            assert(p->pn_type == TOK_ASSIGN);
376            JSParseNode * rhs = p->pn_right;
377            assert(JSSTRING_LENGTH(ATOM_TO_STRING(rhs->pn_atom)) == 0);
378            if (rhs->pn_slot == i) {
379              expression = p->pn_left;
380              break;
381            }
382          }
383          assert(expression != NULL);
384          instrument_expression(expression, f);
385        }
386        else {
387          print_string_atom(param, f);
388        }
389    }    }
390    JS_FinishArenaPool(&pool);    JS_FinishArenaPool(&pool);
391    Stream_write_string(f, ") {\n");    Stream_write_string(f, ") {\n");
392    
393    /* function body */    /* function body */
394    instrument_statement(node->pn_body, f, indent + 2, false);    if (function->flags & JSFUN_EXPR_CLOSURE) {
395        /* expression closure - use output_statement instead of instrument_statement */
396        if (node->pn_body->pn_type == TOK_BODY) {
397          assert(node->pn_body->pn_arity == PN_LIST);
398          assert(node->pn_body->pn_count == 2);
399          output_statement(node->pn_body->pn_head->pn_next, f, indent + 2, false);
400        }
401        else {
402          output_statement(node->pn_body, f, indent + 2, false);
403        }
404      }
405      else {
406        assert(node->pn_body->pn_type == TOK_LC);
407        assert(node->pn_body->pn_arity == PN_LIST);
408        JSParseNode * p = node->pn_body->pn_head;
409        if (destructuring) {
410          p = p->pn_next;
411        }
412        for (; p != NULL; p = p->pn_next) {
413          instrument_statement(p, f, indent + 2, false);
414        }
415      }
416    
417    Stream_write_string(f, "}\n");    Stream_write_string(f, "}\n");
418  }  }
419    
420  static void instrument_function_call(JSParseNode * node, Stream * f) {  static void instrument_function_call(JSParseNode * node, Stream * f) {
421    instrument_expression(node->pn_head, f);    JSParseNode * function_node = node->pn_head;
422      if (function_node->pn_type == TOK_FUNCTION) {
423        JSObject * object = function_node->pn_funpob->object;
424        assert(JS_ObjectIsFunction(context, object));
425        JSFunction * function = (JSFunction *) JS_GetPrivate(context, object);
426        assert(function);
427        assert(object == &function->object);
428    
429        if (function_node->pn_flags & TCF_GENEXP_LAMBDA) {
430          /* it's a generator expression */
431          Stream_write_char(f, '(');
432          output_array_comprehension_or_generator_expression(function_node->pn_body, f);
433          Stream_write_char(f, ')');
434          return;
435        }
436        else {
437          Stream_write_char(f, '(');
438          instrument_expression(function_node, f);
439          Stream_write_char(f, ')');
440        }
441      }
442      else {
443        instrument_expression(function_node, f);
444      }
445    Stream_write_char(f, '(');    Stream_write_char(f, '(');
446    for (struct JSParseNode * p = node->pn_head->pn_next; p != NULL; p = p->pn_next) {    for (struct JSParseNode * p = function_node->pn_next; p != NULL; p = p->pn_next) {
447      if (p != node->pn_head->pn_next) {      if (p != node->pn_head->pn_next) {
448        Stream_write_string(f, ", ");        Stream_write_string(f, ", ");
449      }      }
# Line 340  Line 468 
468        }        }
469        break;        break;
470      case TOK_ASSIGN:      case TOK_ASSIGN:
471          /* destructuring */
472          instrument_expression(p->pn_left, f);
473          Stream_write_string(f, " = ");
474          instrument_expression(p->pn_right, f);
475          break;
476      case TOK_RB:      case TOK_RB:
477      case TOK_RC:      case TOK_RC:
478        /* destructuring */        /* destructuring */
# Line 352  Line 485 
485    }    }
486  }  }
487    
 static void output_for_in(JSParseNode * node, Stream * f) {  
   assert(node->pn_type == TOK_FOR);  
   assert(node->pn_arity == PN_BINARY);  
   Stream_write_string(f, "for ");  
   if (node->pn_iflags & JSITER_FOREACH) {  
     Stream_write_string(f, "each ");  
   }  
   Stream_write_char(f, '(');  
   instrument_expression(node->pn_left, f);  
   Stream_write_char(f, ')');  
 }  
   
488  /*  /*
489  See <Expressions> in jsparse.h.  See <Expressions> in jsparse.h.
490  TOK_FUNCTION is handled as a statement and as an expression.  TOK_FUNCTION is handled as a statement and as an expression.
# Line 391  Line 512 
512      }      }
513      break;      break;
514    case TOK_ASSIGN:    case TOK_ASSIGN:
515      instrument_expression(node->pn_left, f);      if (node->pn_left->pn_type == TOK_RC) {
516          /* destructuring assignment with object literal must be in parentheses */
517          Stream_write_char(f, '(');
518          instrument_expression(node->pn_left, f);
519          Stream_write_char(f, ')');
520        }
521        else {
522          instrument_expression(node->pn_left, f);
523        }
524      Stream_write_char(f, ' ');      Stream_write_char(f, ' ');
525      switch (node->pn_op) {      switch (node->pn_op) {
526      case JSOP_ADD:      case JSOP_ADD:
# Line 478  Line 607 
607        instrument_expression(node->pn_kid, f);        instrument_expression(node->pn_kid, f);
608        break;        break;
609      default:      default:
610        abort();        fatal_source(file_id, node->pn_pos.begin.lineno, "unknown operator (%d)", node->pn_op);
611        break;        break;
612      }      }
613      break;      break;
# Line 535  Line 664 
664      assert(ATOM_IS_STRING(node->pn_atom));      assert(ATOM_IS_STRING(node->pn_atom));
665      {      {
666        JSString * s = ATOM_TO_STRING(node->pn_atom);        JSString * s = ATOM_TO_STRING(node->pn_atom);
667        bool is_keyword = (js_CheckKeyword(JSSTRING_CHARS(s), JSSTRING_LENGTH(s)) != TOK_EOF);        bool must_quote;
668        if (! is_keyword && js_IsIdentifier(s)) {        if (JSSTRING_LENGTH(s) == 0) {
669          Stream_write_char(f, '.');          must_quote = true;
670          print_string_atom(node->pn_atom, f);        }
671          else if (js_CheckKeyword(JSSTRING_CHARS(s), JSSTRING_LENGTH(s)) != TOK_EOF) {
672            must_quote = true;
673          }
674          else if (! js_IsIdentifier(s)) {
675            must_quote = true;
676        }        }
677        else {        else {
678            must_quote = false;
679          }
680          if (must_quote) {
681          Stream_write_char(f, '[');          Stream_write_char(f, '[');
682          print_quoted_string_atom(node->pn_atom, f);          print_quoted_string_atom(node->pn_atom, f);
683          Stream_write_char(f, ']');          Stream_write_char(f, ']');
684        }        }
685          else {
686            Stream_write_char(f, '.');
687            print_string_atom(node->pn_atom, f);
688          }
689      }      }
690      break;      break;
691    case TOK_LB:    case TOK_LB:
# Line 575  Line 716 
716    case TOK_RC:    case TOK_RC:
717      Stream_write_char(f, '{');      Stream_write_char(f, '{');
718      for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {      for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
719        assert(p->pn_type == TOK_COLON);        if (p->pn_type != TOK_COLON) {
720            fatal_source(file_id, p->pn_pos.begin.lineno, "unsupported node type (%d)", p->pn_type);
721          }
722        if (p != node->pn_head) {        if (p != node->pn_head) {
723          Stream_write_string(f, ", ");          Stream_write_string(f, ", ");
724        }        }
# Line 592  Line 735 
735          }          }
736          instrument_expression(p->pn_left, f);          instrument_expression(p->pn_left, f);
737          if (p->pn_right->pn_type != TOK_FUNCTION) {          if (p->pn_right->pn_type != TOK_FUNCTION) {
738            fatal("parse error: expected function");            fatal_source(file_id, p->pn_pos.begin.lineno, "expected function");
739          }          }
740          instrument_function(p->pn_right, f, 0, FUNCTION_GETTER_OR_SETTER);          instrument_function(p->pn_right, f, 0, FUNCTION_GETTER_OR_SETTER);
741          break;          break;
# Line 681  Line 824 
824      break;      break;
825    case TOK_YIELD:    case TOK_YIELD:
826      assert(node->pn_arity == PN_UNARY);      assert(node->pn_arity == PN_UNARY);
827      Stream_write_string(f, "yield ");      Stream_write_string(f, "yield");
828      instrument_expression(node->pn_kid, f);      if (node->pn_kid != NULL) {
829          Stream_write_char(f, ' ');
830          instrument_expression(node->pn_kid, f);
831        }
832      break;      break;
833    case TOK_ARRAYCOMP:    case TOK_ARRAYCOMP:
834      assert(node->pn_arity == PN_LIST);      assert(node->pn_arity == PN_LIST);
# Line 699  Line 845 
845          abort();          abort();
846          break;          break;
847        }        }
       assert(block_node->pn_type == TOK_LEXICALSCOPE);  
       assert(block_node->pn_arity == PN_NAME);  
       JSParseNode * for_node = block_node->pn_expr;  
       assert(for_node->pn_type == TOK_FOR);  
       assert(for_node->pn_arity == PN_BINARY);  
       JSParseNode * push_node;  
       JSParseNode * if_node = NULL;  
       switch (for_node->pn_right->pn_type) {  
       case TOK_ARRAYPUSH:  
         push_node = for_node->pn_right;  
         assert(push_node->pn_arity == PN_UNARY);  
         break;  
       case TOK_IF:  
         if_node = for_node->pn_right;  
         assert(if_node->pn_arity == PN_TERNARY);  
         push_node = if_node->pn_kid2;  
         break;  
       default:  
         abort();  
         break;  
       }  
848        Stream_write_char(f, '[');        Stream_write_char(f, '[');
849        instrument_expression(push_node->pn_kid, f);        output_array_comprehension_or_generator_expression(block_node, f);
       Stream_write_char(f, ' ');  
       output_for_in(for_node, f);  
       if (if_node) {  
         Stream_write_string(f, " if (");  
         instrument_expression(if_node->pn_kid1, f);  
         Stream_write_char(f, ')');  
       }  
850        Stream_write_char(f, ']');        Stream_write_char(f, ']');
851      }      }
852      break;      break;
# Line 743  Line 861 
861      instrument_declarations(node, f);      instrument_declarations(node, f);
862      break;      break;
863    default:    default:
864      fatal("unsupported node type in file %s: %d", file_id, node->pn_type);      fatal_source(file_id, node->pn_pos.begin.lineno, "unsupported node type (%d)", node->pn_type);
865    }    }
866  }  }
867    
# Line 772  Line 890 
890      uint16_t line = node->pn_pos.begin.lineno;      uint16_t line = node->pn_pos.begin.lineno;
891      if (! is_jscoverage_if) {      if (! is_jscoverage_if) {
892        if (line > num_lines) {        if (line > num_lines) {
893          fatal("%s: script contains more than 65,535 lines", file_id);          fatal("file %s contains more than 65,535 lines", file_id);
894        }        }
895        if (line >= 2 && exclusive_directives[line - 2]) {        if (line >= 2 && exclusive_directives[line - 2]) {
896          is_jscoverage_if = true;          is_jscoverage_if = true;
# Line 820  Line 938 
938      Stream_write_string(f, "switch (");      Stream_write_string(f, "switch (");
939      instrument_expression(node->pn_left, f);      instrument_expression(node->pn_left, f);
940      Stream_write_string(f, ") {\n");      Stream_write_string(f, ") {\n");
941      for (struct JSParseNode * p = node->pn_right->pn_head; p != NULL; p = p->pn_next) {      {
942        Stream_printf(f, "%*s", indent, "");        JSParseNode * list = node->pn_right;
943        switch (p->pn_type) {        if (list->pn_type == TOK_LEXICALSCOPE) {
944        case TOK_CASE:          list = list->pn_expr;
945          Stream_write_string(f, "case ");        }
946          instrument_expression(p->pn_left, f);        for (struct JSParseNode * p = list->pn_head; p != NULL; p = p->pn_next) {
947          Stream_write_string(f, ":\n");          Stream_printf(f, "%*s", indent, "");
948          break;          switch (p->pn_type) {
949        case TOK_DEFAULT:          case TOK_CASE:
950          Stream_write_string(f, "default:\n");            Stream_write_string(f, "case ");
951          break;            instrument_expression(p->pn_left, f);
952        default:            Stream_write_string(f, ":\n");
953          abort();            break;
954          break;          case TOK_DEFAULT:
955              Stream_write_string(f, "default:\n");
956              break;
957            default:
958              abort();
959              break;
960            }
961            instrument_statement(p->pn_right, f, indent + 2, false);
962        }        }
       instrument_statement(p->pn_right, f, indent + 2, false);  
963      }      }
964      Stream_printf(f, "%*s", indent, "");      Stream_printf(f, "%*s", indent, "");
965      Stream_write_string(f, "}\n");      Stream_write_string(f, "}\n");
# Line 1057  Line 1181 
1181        break;        break;
1182      }      }
1183      break;      break;
1184      case TOK_DEBUGGER:
1185        Stream_printf(f, "%*s", indent, "");
1186        Stream_write_string(f, "debugger;\n");
1187        break;
1188    default:    default:
1189      fatal("unsupported node type in file %s: %d", file_id, node->pn_type);      fatal_source(file_id, node->pn_pos.begin.lineno, "unsupported node type (%d)", node->pn_type);
1190    }    }
1191  }  }
1192    
# Line 1071  Line 1199 
1199    if (node->pn_type != TOK_LC && node->pn_type != TOK_LEXICALSCOPE) {    if (node->pn_type != TOK_LC && node->pn_type != TOK_LEXICALSCOPE) {
1200      uint16_t line = node->pn_pos.begin.lineno;      uint16_t line = node->pn_pos.begin.lineno;
1201      if (line > num_lines) {      if (line > num_lines) {
1202        fatal("%s: script contains more than 65,535 lines", file_id);        fatal("file %s contains more than 65,535 lines", file_id);
1203      }      }
1204    
1205      /* the root node has line number 0 */      /* the root node has line number 0 */
# Line 1119  Line 1247 
1247  }  }
1248    
1249  static void error_reporter(JSContext * context, const char * message, JSErrorReport * report) {  static void error_reporter(JSContext * context, const char * message, JSErrorReport * report) {
1250    fprintf(stderr, "jscoverage: parse error: line %u: %s\n", report->lineno, message);    warn_source(file_id, report->lineno, "%s", message);
1251  }  }
1252    
1253  void jscoverage_instrument_js(const char * id, const uint16_t * characters, size_t num_characters, Stream * output) {  void jscoverage_instrument_js(const char * id, const uint16_t * characters, size_t num_characters, Stream * output) {
# Line 1128  Line 1256 
1256    /* parse the javascript */    /* parse the javascript */
1257    JSParseContext parse_context;    JSParseContext parse_context;
1258    if (! js_InitParseContext(context, &parse_context, NULL, NULL, characters, num_characters, NULL, NULL, 1)) {    if (! js_InitParseContext(context, &parse_context, NULL, NULL, characters, num_characters, NULL, NULL, 1)) {
1259      fatal("cannot create token stream from file: %s", file_id);      fatal("cannot create token stream from file %s", file_id);
1260    }    }
1261    JSErrorReporter old_error_reporter = JS_SetErrorReporter(context, error_reporter);    JSErrorReporter old_error_reporter = JS_SetErrorReporter(context, error_reporter);
1262    JSParseNode * node = js_ParseScript(context, global, &parse_context);    JSParseNode * node = js_ParseScript(context, global, &parse_context);
1263    if (node == NULL) {    if (node == NULL) {
1264      js_ReportUncaughtException(context);      js_ReportUncaughtException(context);
1265      fatal("parse error in file: %s", file_id);      fatal("parse error in file %s", file_id);
1266    }    }
1267    JS_SetErrorReporter(context, old_error_reporter);    JS_SetErrorReporter(context, old_error_reporter);
1268    num_lines = node->pn_pos.end.lineno;    num_lines = node->pn_pos.end.lineno;
# Line 1155  Line 1283 
1283    size_t i = 0;    size_t i = 0;
1284    while (i < num_characters) {    while (i < num_characters) {
1285      if (line_number == UINT16_MAX) {      if (line_number == UINT16_MAX) {
1286        fatal("%s: script has more than 65,535 lines", file_id);        fatal("file %s contains more than 65,535 lines", file_id);
1287      }      }
1288      line_number++;      line_number++;
1289      size_t line_start = i;      size_t line_start = i;
# Line 1222  Line 1350 
1350    
1351    /* write line number info to the output */    /* write line number info to the output */
1352    Stream_write_string(output, "/* automatically generated by JSCoverage - do not edit */\n");    Stream_write_string(output, "/* automatically generated by JSCoverage - do not edit */\n");
1353    Stream_write_string(output, "if (! top._$jscoverage) {\n  top._$jscoverage = {};\n}\n");    if (jscoverage_mozilla) {
1354    Stream_write_string(output, "var _$jscoverage = top._$jscoverage;\n");      Stream_write_string(output, "try {\n");
1355        Stream_write_string(output, "  Components.utils.import('resource://gre/modules/jscoverage.jsm');\n");
1356        Stream_printf(output, "  dump('%s: successfully imported jscoverage module\\n');\n", id);
1357        Stream_write_string(output, "}\n");
1358        Stream_write_string(output, "catch (e) {\n");
1359        Stream_write_string(output, "  _$jscoverage = {};\n");
1360        Stream_printf(output, "  dump('%s: failed to import jscoverage module - coverage not available for this file\\n');\n", id);
1361        Stream_write_string(output, "}\n");
1362      }
1363      else {
1364        Stream_write_string(output, "if (! top._$jscoverage) {\n  top._$jscoverage = {};\n}\n");
1365        Stream_write_string(output, "var _$jscoverage = top._$jscoverage;\n");
1366      }
1367    Stream_printf(output, "if (! _$jscoverage['%s']) {\n", file_id);    Stream_printf(output, "if (! _$jscoverage['%s']) {\n", file_id);
1368    Stream_printf(output, "  _$jscoverage['%s'] = [];\n", file_id);    Stream_printf(output, "  _$jscoverage['%s'] = [];\n", file_id);
1369    for (int i = 0; i < num_lines; i++) {    for (int i = 0; i < num_lines; i++) {

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