forked from emscripten-core/emscripten
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathjsifier.js
1775 lines (1625 loc) · 75.4 KB
/
jsifier.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
//"use strict";
// Convert analyzed data to javascript. Everything has already been calculated
// before this stage, which just does the final conversion to JavaScript.
// Handy sets
var STRUCT_LIST = set('struct', 'list');
var UNDERSCORE_OPENPARENS = set('_', '(');
var RELOOP_IGNORED_LASTS = set('return', 'unreachable', 'resume');
var addedLibraryItems = {};
var asmLibraryFunctions = [];
var SETJMP_LABEL = -1;
// JSifier
function JSify(data, functionsOnly, givenFunctions) {
var mainPass = !functionsOnly;
if (mainPass) {
var shellFile = SHELL_FILE ? SHELL_FILE : (BUILD_AS_SHARED_LIB ? 'shell_sharedlib.js' : 'shell.js');
if (phase == 'pre') {
// We will start to print out the data, but must do so carefully - we are
// dealing with potentially *huge* strings. Convenient replacements and
// manipulations may create in-memory copies, and we may OOM.
//
// Final shape that will be created:
// shell
// (body)
// preamble
// runtime
// generated code
// postamble
// global_vars
//
// First, we print out everything until the generated code. Then the
// functions will print themselves out as they are parsed. Finally, we
// will call finalCombiner in the main pass, to print out everything
// else. This lets us not hold any strings in memory, we simply print
// things out as they are ready.
var shellParts = read(shellFile).split('{{BODY}}');
print(shellParts[0]);
var preFile = BUILD_AS_SHARED_LIB ? 'preamble_sharedlib.js' : 'preamble.js';
var pre = processMacros(preprocess(read(preFile).replace('{{RUNTIME}}', getRuntime())));
print(pre);
data.unparsedFunctions.forEach(function(func) {
Functions.implementedFunctions[func.ident] = Functions.getSignature(func.returnType, func.params.map(function(param) { return param.type }));
});
}
}
// Does simple 'macro' substitution, using Django-like syntax,
// {{{ code }}} will be replaced with |eval(code)|.
function processMacros(text) {
return text.replace(/{{{[^}]+}}}/g, function(str) {
str = str.substr(3, str.length-6);
return eval(str).toString();
});
}
var substrate = new Substrate('JSifyer');
if (mainPass) {
// Handle unparsed types TODO: Batch them
analyzer(intertyper(data.unparsedTypess[0].lines, true), true);
data.unparsedTypess = null;
// Add additional necessary items for the main pass. We can now do this since types are parsed (types can be used through
// generateStructInfo in library.js)
LibraryManager.load();
if (phase == 'pre') {
var libFuncsToInclude;
if (INCLUDE_FULL_LIBRARY) {
assert(!BUILD_AS_SHARED_LIB, 'Cannot have both INCLUDE_FULL_LIBRARY and BUILD_AS_SHARED_LIB set.')
libFuncsToInclude = [];
for (var key in LibraryManager.library) {
if (!key.match(/__(deps|postset|inline|asm|sig)$/)) {
libFuncsToInclude.push(key);
}
}
} else {
libFuncsToInclude = DEFAULT_LIBRARY_FUNCS_TO_INCLUDE;
}
libFuncsToInclude.forEach(function(ident) {
data.functionStubs.push({
intertype: 'functionStub',
ident: '_' + ident
});
});
}
}
// Functions
Functions.currExternalFunctions = !mainPass ? givenFunctions.currExternalFunctions : {};
data.functionStubs.forEach(function(func) {
// Don't overwrite stubs that have more info.
if (!Functions.currExternalFunctions.hasOwnProperty(func.ident) ||
!Functions.currExternalFunctions[func.ident].numParams === undefined) {
Functions.currExternalFunctions[func.ident] = {
hasVarArgs: func.hasVarArgs,
numParams: func.params && func.params.length
};
}
});
if (phase == 'funcs') { // || phase == 'pre') { // pre has function shells, just to defined implementedFunctions
var MAX_BATCH_FUNC_LINES = 1000;
while (data.unparsedFunctions.length > 0) {
var currFuncLines = [];
var currBaseLineNums = [];
while (currFuncLines.length == 0 ||
(data.unparsedFunctions.length > 0 && currFuncLines.length + data.unparsedFunctions[0].lines.length <= MAX_BATCH_FUNC_LINES)) {
currBaseLineNums.push([currFuncLines.length, data.unparsedFunctions[0].lineNum-1]);
currFuncLines = currFuncLines.concat(data.unparsedFunctions[0].lines); // for first one, assign, do not concat?
data.unparsedFunctions.shift();
}
dprint('unparsedFunctions','====================\n// Processing function batch of ' + currBaseLineNums.length +
' functions, ' + currFuncLines.length + ' lines, functions left: ' + data.unparsedFunctions.length);
if (DEBUG_MEMORY) MemoryDebugger.tick('pre-func');
JSify(analyzer(intertyper(currFuncLines, true, currBaseLineNums), true), true, Functions);
if (DEBUG_MEMORY) MemoryDebugger.tick('post-func');
}
currFuncLines = currBaseLineNums = null; // Do not hold on to anything from inside that loop (JS function scoping..)
data.unparsedFunctions = null;
}
// Actors
// type
// FIXME: This is no longer used, we do not actually need to JSify on types. TODO: Remove this and related code
substrate.addActor('Type', {
processItem: function(item) {
var type = Types.types[item.name_];
var niceName = toNiceIdent(item.name_);
// We might export all of Types.types, cleaner that way, but do not want slowdowns in accessing flatteners
item.JS = 'var ' + niceName + '___SIZE = ' + Types.types[item.name_].flatSize + '; // ' + item.name_ + '\n';
if (type.needsFlattening && !type.flatFactor) {
item.JS += 'var ' + niceName + '___FLATTENER = ' + JSON.stringify(Types.types[item.name_].flatIndexes) + ';';
}
return [item];
}
});
function makeEmptyStruct(type) {
var ret = [];
var typeData = Types.types[type];
assertTrue(typeData);
for (var i = 0; i < typeData.flatSize; i++) {
ret.push(0);
}
return ret;
}
function alignStruct(values, type) {
var typeData = Types.types[type];
assertTrue(typeData);
var ret = new Array(typeData.flatSize);
var index = 0;
var i = 0;
while (i < values.length) {
// Pad until the right place
var padded = typeData.flatFactor ? typeData.flatFactor*i : typeData.flatIndexes[i];
while (index < padded) {
ret[index++] = 0;
}
// Add current value(s)
var currValue = values[i];
if (USE_TYPED_ARRAYS == 2 && typeData.fields[i] == 'i64') {
// 'flatten' out the 64-bit value into two 32-bit halves
var parts = parseI64Constant(currValue, true);
ret[index++] = parts[0];
ret[index++] = 0;
ret[index++] = 0;
ret[index++] = 0;
ret[index++] = parts[1];
ret[index++] = 0;
ret[index++] = 0;
ret[index++] = 0;
} else {
currValue = flatten(currValue);
if (typeof currValue == 'object') {
for (var j = 0; j < currValue.length; j++) {
ret[index++] = currValue[j];
}
} else {
ret[index++] = currValue;
}
}
i += 1;
}
while (index < typeData.flatSize) {
ret[index++] = 0;
}
return ret;
}
// Gets an entire constant expression
function makeConst(value, type, ident) {
// Gets an array of constant items, separated by ',' tokens
function handleSegments(tokens) {
// Handle a single segment (after comma separation)
function handleSegment(segment) {
var ret;
if (segment.intertype === 'value') {
ret = segment.ident;
} else if (segment.intertype === 'emptystruct') {
ret = makeEmptyStruct(segment.type);
} else if (segment.intertype in PARSABLE_LLVM_FUNCTIONS) {
ret = finalizeLLVMFunctionCall(segment);
} else if (segment.intertype in STRUCT_LIST) {
ret = alignStruct(handleSegments(segment.contents), segment.type);
} else if (segment.intertype === 'string') {
ret = parseLLVMString(segment.text); // + ' /* ' + text + '*/';
} else if (segment.intertype === 'blockaddress') {
ret = finalizeBlockAddress(segment);
} else {
throw 'Invalid segment: ' + dump(segment);
}
assert(segment.type, 'Missing type for constant segment!');
return makeGlobalUse(indexizeFunctions(ret, segment.type));
};
return tokens.map(handleSegment)
}
//dprint('jsifier const: ' + JSON.stringify(value) + ',' + type + '\n');
if (value.intertype in PARSABLE_LLVM_FUNCTIONS) {
return [finalizeLLVMFunctionCall(value)];
} else if (Runtime.isNumberType(type) || pointingLevels(type) >= 1) {
return [makeGlobalUse(indexizeFunctions(parseNumerical(value.value), type))];
} else if (value.intertype === 'emptystruct') {
return makeEmptyStruct(type);
} else if (value.intertype === 'string') {
return parseLLVMString(value.text);
} else {
return alignStruct(handleSegments(value.contents), type);
}
}
function parseConst(value, type, ident) {
var constant = makeConst(value, type);
constant = flatten(constant).map(function(x) { return parseNumerical(x) })
return constant;
}
// globalVariable
substrate.addActor('GlobalVariable', {
processItem: function(item) {
function needsPostSet(value) {
if (typeof value !== 'string') return false;
return value[0] in UNDERSCORE_OPENPARENS || value.substr(0, 14) === 'CHECK_OVERFLOW'
|| value.substr(0, 6) === 'GLOBAL';
}
item.intertype = 'GlobalVariableStub';
assert(!item.lines); // FIXME remove this, after we are sure it isn't needed
var ret = [item];
if (item.ident == '_llvm_global_ctors') {
item.JS = '\n__ATINIT__ = __ATINIT__.concat([\n' +
item.ctors.map(function(ctor) { return ' { func: function() { ' + ctor + '() } }' }).join(',\n') +
'\n]);\n';
return ret;
}
var constant = null;
var allocator = (BUILD_AS_SHARED_LIB && !item.external) ? 'ALLOC_NORMAL' : 'ALLOC_STATIC';
var index = null;
if (item.external && BUILD_AS_SHARED_LIB) {
// External variables in shared libraries should not be declared as
// they would shadow similarly-named globals in the parent.
item.JS = '';
} else {
item.JS = makeGlobalDef(item.ident);
}
if (!NAMED_GLOBALS && isIndexableGlobal(item.ident)) {
index = makeGlobalUse(item.ident); // index !== null indicates we are indexing this
allocator = 'ALLOC_NONE';
}
if (item.external) {
if (Runtime.isNumberType(item.type) || isPointerType(item.type)) {
constant = zeros(Runtime.getNativeFieldSize(item.type));
} else {
constant = makeEmptyStruct(item.type);
}
} else {
constant = parseConst(item.value, item.type, item.ident);
}
assert(typeof constant === 'object');//, [typeof constant, JSON.stringify(constant), item.external]);
// This is a flattened object. We need to find its idents, so they can be assigned to later
constant.forEach(function(value, i) {
if (needsPostSet(value)) { // ident, or expression containing an ident
ret.push({
intertype: 'GlobalVariablePostSet',
JS: makeSetValue(makeGlobalUse(item.ident), i, value, 'i32', false, true) + ';' // ignore=true, since e.g. rtti and statics cause lots of safe_heap errors
});
constant[i] = '0';
}
});
if (item.external) {
// External variables in shared libraries should not be declared as
// they would shadow similarly-named globals in the parent, so do nothing here.
if (BUILD_AS_SHARED_LIB) return ret;
// Library items need us to emit something, but everything else requires nothing.
if (!LibraryManager.library[item.ident.slice(1)]) return ret;
}
// ensure alignment
constant = constant.concat(zeros(Runtime.alignMemory(constant.length) - constant.length));
// Special case: class vtables. We make sure they are null-terminated, to allow easy runtime operations
if (item.ident.substr(0, 5) == '__ZTV') {
constant = constant.concat(zeros(Runtime.alignMemory(QUANTUM_SIZE)));
}
// NOTE: This is the only place that could potentially create static
// allocations in a shared library.
constant = makePointer(constant, null, allocator, item.type, index);
var js = (index !== null ? '' : item.ident + '=') + constant;
if (js) js += ';';
if (!ASM_JS && NAMED_GLOBALS && (EXPORT_ALL || (item.ident in EXPORTED_GLOBALS))) {
js += '\nModule["' + item.ident + '"] = ' + item.ident + ';';
}
if (BUILD_AS_SHARED_LIB == 2 && !item.private_) {
// TODO: make the assert conditional on ASSERTIONS
js += 'if (globalScope) { assert(!globalScope["' + item.ident + '"]); globalScope["' + item.ident + '"] = ' + item.ident + ' }';
}
if (item.external && !NAMED_GLOBALS) {
js = 'var ' + item.ident + ' = ' + js; // force an explicit naming, even if unnamed globals, for asm forwarding
}
return ret.concat({
intertype: 'GlobalVariable',
JS: js,
});
}
});
// alias
substrate.addActor('Alias', {
processItem: function(item) {
item.intertype = 'GlobalVariableStub';
var ret = [item];
item.JS = 'var ' + item.ident + ';';
// Set the actual value in a postset, since it may be a global variable. We also order by dependencies there
Variables.globals[item.ident].targetIdent = item.value.ident;
var value = Variables.globals[item.ident].resolvedAlias = finalizeLLVMParameter(item.value);
var fix = '';
if (BUILD_AS_SHARED_LIB == 2 && !item.private_) {
var target = item.ident;
if (isFunctionType(item.type)) {
target = item.value.ident; // the other side does not know this is an alias/function table index. So make it the alias target.
var varData = Variables.globals[target];
assert(!varData, 'multi-level aliasing does not work yet in shared lib 2 exports');
}
fix = '\nif (globalScope) { assert(!globalScope["' + item.ident + '"]); globalScope["' + item.ident + '"] = ' + target + ' }'
}
ret.push({
intertype: 'GlobalVariablePostSet',
ident: item.ident,
dependencies: set([value]),
JS: item.ident + ' = ' + value + ';' + fix
});
return ret;
}
});
function processLibraryFunction(snippet, ident) {
snippet = snippet.toString();
assert(snippet.indexOf('XXX missing C define') == -1,
'Trying to include a library function with missing C defines: ' + ident + ' | ' + snippet);
// name the function; overwrite if it's already named
snippet = snippet.replace(/function(?:\s+([^(]+))?\s*\(/, 'function _' + ident + '(');
if (LIBRARY_DEBUG) {
snippet = snippet.replace('{', '{ var ret = (function() { if (Runtime.debug) Module.printErr("[library call:' + ident + ': " + Array.prototype.slice.call(arguments).map(Runtime.prettyPrint) + "]"); ');
snippet = snippet.substr(0, snippet.length-1) + '}).apply(this, arguments); if (Runtime.debug && typeof ret !== "undefined") Module.printErr(" [ return:" + Runtime.prettyPrint(ret)); return ret; \n}';
}
return snippet;
}
// functionStub
substrate.addActor('FunctionStub', {
processItem: function(item) {
function addFromLibrary(ident) {
if (ident in addedLibraryItems) return '';
addedLibraryItems[ident] = true;
// dependencies can be JS functions, which we just run
if (typeof ident == 'function') return ident();
// Don't replace implemented functions with library ones (which can happen when we add dependencies).
// Note: We don't return the dependencies here. Be careful not to end up where this matters
if (('_' + ident) in Functions.implementedFunctions) return '';
var snippet = LibraryManager.library[ident];
var redirectedIdent = null;
var deps = LibraryManager.library[ident + '__deps'] || [];
var isFunction = false;
if (typeof snippet === 'string') {
var target = LibraryManager.library[snippet];
if (target) {
// Redirection for aliases. We include the parent, and at runtime make ourselves equal to it.
// This avoid having duplicate functions with identical content.
redirectedIdent = snippet;
deps.push(snippet);
snippet = '_' + snippet;
}
// In asm, we need to know about library functions. If there is a target, though, then no
// need to consider this a library function - we will call directly to it anyhow
if (ASM_JS && !redirectedIdent && (typeof target == 'function' || /Math\.\w+/.exec(snippet))) {
Functions.libraryFunctions[ident] = 1;
}
} else if (typeof snippet === 'object') {
snippet = stringifyWithFunctions(snippet);
} else if (typeof snippet === 'function') {
isFunction = true;
snippet = processLibraryFunction(snippet, ident);
if (ASM_JS) Functions.libraryFunctions[ident] = 1;
}
var postsetId = ident + '__postset';
var postset = LibraryManager.library[postsetId];
if (postset && !addedLibraryItems[postsetId]) {
addedLibraryItems[postsetId] = true;
ret.push({
intertype: 'GlobalVariablePostSet',
JS: postset
});
}
if (redirectedIdent) {
deps = deps.concat(LibraryManager.library[redirectedIdent + '__deps'] || []);
}
if (ASM_JS) {
// In asm, dependencies implemented in C might be needed by JS library functions.
// We don't know yet if they are implemented in C or not. To be safe, export such
// special cases.
[LIBRARY_DEPS_TO_AUTOEXPORT].forEach(function(special) {
deps.forEach(function(dep) {
if (dep == special && !EXPORTED_FUNCTIONS[dep]) {
EXPORTED_FUNCTIONS[dep] = 1;
}
});
});
}
// $ident's are special, we do not prefix them with a '_'.
if (ident[0] === '$') {
ident = ident.substr(1);
} else {
ident = '_' + ident;
}
if (VERBOSE) printErr('adding ' + ident + ' and deps ' + deps);
var depsText = (deps ? '\n' + deps.map(addFromLibrary).filter(function(x) { return x != '' }).join('\n') : '');
var contentText = isFunction ? snippet : ('var ' + ident + '=' + snippet + ';');
if (ASM_JS) {
var sig = LibraryManager.library[ident.substr(1) + '__sig'];
if (isFunction && sig && LibraryManager.library[ident.substr(1) + '__asm']) {
// asm library function, add it as generated code alongside the generated code
Functions.implementedFunctions[ident] = sig;
asmLibraryFunctions.push(contentText);
contentText = ' ';
EXPORTED_FUNCTIONS[ident] = 1;
Functions.libraryFunctions[ident.substr(1)] = 2;
}
}
if ((!ASM_JS || phase == 'pre') &&
(EXPORT_ALL || (ident in EXPORTED_FUNCTIONS))) {
contentText += '\nModule["' + ident + '"] = ' + ident + ';';
}
return depsText + contentText;
}
var ret = [item];
if (IGNORED_FUNCTIONS.indexOf(item.ident) >= 0) return null;
var shortident = item.ident.substr(1);
if (BUILD_AS_SHARED_LIB) {
// Shared libraries reuse the runtime of their parents.
item.JS = '';
} else {
// If this is not linkable, anything not in the library is definitely missing
var cancel = false;
if (!LINKABLE && !LibraryManager.library.hasOwnProperty(shortident) && !LibraryManager.library.hasOwnProperty(shortident + '__inline')) {
if (ERROR_ON_UNDEFINED_SYMBOLS) error('unresolved symbol: ' + shortident);
if (VERBOSE || WARN_ON_UNDEFINED_SYMBOLS) printErr('warning: unresolved symbol: ' + shortident);
if (ASM_JS || item.ident in DEAD_FUNCTIONS) {
// emit a stub that will fail during runtime. this allows asm validation to succeed.
LibraryManager.library[shortident] = new Function("Module['printErr']('missing function: " + shortident + "'); abort(-1);");
} else {
cancel = true; // emit nothing, not even var X = undefined;
}
}
item.JS = cancel ? ';' : addFromLibrary(shortident);
}
return ret;
}
});
// function splitter
substrate.addActor('FunctionSplitter', {
processItem: function(item) {
var ret = [item];
item.splitItems = 0;
item.labels.forEach(function(label) {
label.lines.forEach(function(line) {
line.func = item.ident;
line.funcData = item; // TODO: remove all these, access it globally
line.parentLabel = label.ident;
ret.push(line);
item.splitItems ++;
});
});
this.forwardItems(ret, 'FuncLineTriager');
}
});
// function for filtering functions for label debugging
if (LABEL_FUNCTION_FILTERS.length > 0) {
var LABEL_FUNCTION_FILTER_SET = set(LABEL_FUNCTION_FILTERS);
var functionNameFilterTest = function(ident) {
return (ident in LABEL_FUNCTION_FILTER_SET);
};
} else {
// no filters are specified, all function names are printed
var functionNameFilterTest = function(ident) {
return true;
}
}
// function reconstructor & post-JS optimizer
substrate.addActor('FunctionReconstructor', {
funcs: {},
seen: {},
processItem: function(item) {
if (this.seen[item.__uid__]) return null;
if (item.intertype == 'function') {
this.funcs[item.ident] = item;
item.relines = {};
this.seen[item.__uid__] = true;
return null;
}
var line = item;
var func = this.funcs[line.func];
if (!func) return null;
// Re-insert our line
this.seen[item.__uid__] = true;
var label = func.labels.filter(function(label) { return label.ident == line.parentLabel })[0];
label.lines = label.lines.map(function(line2) {
return (line2.lineNum !== line.lineNum) ? line2 : line;
});
func.splitItems --;
// OLD delete line.funcData; // clean up
if (func.splitItems > 0) return null;
// We have this function all reconstructed, go and finalize it's JS!
if (IGNORED_FUNCTIONS.indexOf(func.ident) >= 0) return null;
func.JS = '\n';
var paramIdents = func.params.map(function(param) {
return toNiceIdent(param.ident);
});
if (CLOSURE_ANNOTATIONS) {
func.JS += '/**\n';
paramIdents.forEach(function(param) {
func.JS += ' * @param {number} ' + param + '\n';
});
func.JS += ' * @return {number}\n'
func.JS += ' */\n';
}
if (PRINT_SPLIT_FILE_MARKER) {
func.JS += '\n//FUNCTION_BEGIN_MARKER\n'
var associatedSourceFile = "NO_SOURCE";
}
func.JS += 'function ' + func.ident + '(' + paramIdents.join(', ') + ') {\n';
if (PGO) {
func.JS += ' PGOMonitor.called["' + func.ident + '"] = 1;\n';
}
if (ASM_JS) {
// spell out argument types
func.params.forEach(function(param) {
func.JS += ' ' + param.ident + ' = ' + asmCoercion(param.ident, param.type) + ';\n';
});
// spell out local variables
var vars = values(func.variables).filter(function(v) { return v.origin != 'funcparam' });
if (vars.length > 0) {
var chunkSize = 8;
var chunks = [];
var i = 0;
while (i < vars.length) {
chunks.push(vars.slice(i, i+chunkSize));
i += chunkSize;
}
for (i = 0; i < chunks.length; i++) {
func.JS += ' var ' + chunks[i].map(function(v) {
var type = getImplementationType(v);
if (!isIllegalType(type) || v.ident.indexOf('$', 1) > 0) { // not illegal, or a broken up illegal
return v.ident + ' = ' + asmInitializer(type); //, func.variables[v.ident].impl);
} else {
return range(Math.ceil(getBits(type)/32)).map(function(i) {
return v.ident + '$' + i + '= 0';
}).join(',');
}
}).join(', ') + ';\n';
}
}
}
if (true) { // TODO: optimize away when not needed
if (CLOSURE_ANNOTATIONS) func.JS += '/** @type {number} */';
func.JS += ' var label = 0;\n';
}
if (ASM_JS) {
var hasByVal = false;
func.params.forEach(function(param) {
hasByVal = hasByVal || param.byVal;
});
if (hasByVal) {
func.JS += ' var tempParam = 0;\n';
}
}
// Prepare the stack, if we need one. If we have other stack allocations, force the stack to be set up.
func.JS += ' ' + RuntimeGenerator.stackEnter(func.initialStack, func.otherStackAllocations) + ';\n';
// Make copies of by-value params
// XXX It is not clear we actually need this. While without this we fail, it does look like
// Clang normally does the copy itself, in the calling function. We only need this code
// when Clang optimizes the code and passes the original, not the copy, to the other
// function. But Clang still copies, the copy is just unused! Need to figure out if that
// is caused by our running just some optimizations (the safe ones), or if its a bug
// in Clang, or a bug in our understanding of the IR.
func.params.forEach(function(param) {
if (param.byVal) {
var type = removePointing(param.type);
var typeInfo = Types.types[type];
func.JS += ' ' + (ASM_JS ? '' : 'var ') + 'tempParam = ' + param.ident + '; ' + param.ident + ' = ' + RuntimeGenerator.stackAlloc(typeInfo.flatSize) + ';' +
makeCopyValues(param.ident, 'tempParam', typeInfo.flatSize, 'null', null, param.byVal) + ';\n';
}
});
if (LABEL_DEBUG && functionNameFilterTest(func.ident)) func.JS += " Module.print(INDENT + ' Entering: " + func.ident + ": ' + Array.prototype.slice.call(arguments)); INDENT += ' ';\n";
// Walk function blocks and generate JS
function walkBlock(block, indent) {
if (!block) return '';
dprint('relooping', 'walking block: ' + block.type + ',' + block.entries + ' : ' + block.labels.length);
function getLabelLines(label, indent, relooping) {
if (!label) return '';
var ret = '';
if ((LABEL_DEBUG >= 2) && functionNameFilterTest(func.ident)) {
ret += indent + "Module.print(INDENT + '" + func.ident + ":" + label.ident + "');\n";
}
if (EXECUTION_TIMEOUT > 0) {
ret += indent + 'if (Date.now() - START_TIME >= ' + (EXECUTION_TIMEOUT*1000) + ') throw "Timed out!" + (new Error().stack);\n';
}
if (PRINT_SPLIT_FILE_MARKER && Debugging.on && Debugging.getAssociatedSourceFile(line.lineNum)) {
// Overwrite the associated source file for every line. The last line should contain the source file associated to
// the return value/address of outer most block (the marked function).
associatedSourceFile = Debugging.getAssociatedSourceFile(line.lineNum);
}
// for special labels we care about (for phi), mark that we visited them
var i = 0;
return ret + label.lines.map(function(line) {
var JS = line.JS;
if (relooping && i == label.lines.length-1) {
if (line.intertype == 'branch' || line.intertype == 'switch') {
JS = ''; // just branching operations - done in the relooper, so nothing need be done here
} else if (line.intertype == 'invoke') {
JS = line.reloopingJS; // invokes have code that is not rendered in the relooper (the call inside a try-catch)
}
}
i++;
return JS + (Debugging.on ? Debugging.getComment(line.lineNum) : '');
})
.join('\n')
.split('\n') // some lines include line breaks
.map(function(line) { return indent + line })
.join('\n');
}
var ret = '';
if (!RELOOP || func.forceEmulated) { // TODO: also if just 1 label?
if (block.labels.length > 1) {
if (block.entries.length == 1) {
ret += indent + 'label = ' + getLabelId(block.entries[0]) + '; ' + (SHOW_LABELS ? '/* ' + getOriginalLabelId(block.entries[0]) + ' */' : '') + '\n';
} // otherwise, should have been set before!
if (func.setjmpTable) {
if (!ASM_JS) {
var setjmpTable = {};
ret += indent + 'var mySetjmpIds = {};\n';
ret += indent + 'var setjmpTable = {';
func.setjmpTable.forEach(function(triple) { // original label, label we created for right after the setjmp, variable setjmp result goes into
ret += '"' + getLabelId(triple.oldLabel) + '": ' + 'function(value) { label = ' + getLabelId(triple.newLabel) + '; ' + triple.assignTo + ' = value },';
});
ret += 'dummy: 0';
ret += '};\n';
} else {
ret += 'var setjmpLabel = 0;\n';
ret += 'var setjmpTable = ' + RuntimeGenerator.stackAlloc(4 * (MAX_SETJMPS + 1) * 2) + ';\n';
ret += makeSetValue('setjmpTable', '0', '0', 'i32') + ';'; // initialize first entry to 0
}
}
ret += indent + 'while(1) ';
if (func.setjmpTable && !ASM_JS) {
ret += 'try { ';
}
ret += 'switch(' + asmCoercion('label', 'i32') + ') {\n';
ret += block.labels.map(function(label) {
return indent + ' case ' + getLabelId(label.ident) + ': ' + (SHOW_LABELS ? '// ' + getOriginalLabelId(label.ident) : '') + '\n'
+ getLabelLines(label, indent + ' ');
}).join('\n') + '\n';
if (func.setjmpTable && ASM_JS) {
// emit a label in which we write to the proper local variable, before jumping to the actual label
ret += ' case ' + SETJMP_LABEL + ': ';
ret += func.setjmpTable.map(function(triple) { // original label, label we created for right after the setjmp, variable setjmp result goes into
return 'if ((setjmpLabel|0) == ' + getLabelId(triple.oldLabel) + ') { ' + triple.assignTo + ' = threwValue; label = ' + triple.newLabel + ' }\n';
}).join(' else ');
if (ASSERTIONS) ret += 'else abort(-3);\n';
ret += '__THREW__ = threwValue = 0;\n';
ret += 'break;\n';
}
if (ASSERTIONS) ret += indent + ' default: assert(0' + (ASM_JS ? '' : ', "bad label: " + label') + ');\n';
ret += indent + '}\n';
if (func.setjmpTable && !ASM_JS) {
ret += ' } catch(e) { if (!e.longjmp || !(e.id in mySetjmpIds)) throw(e); setjmpTable[setjmpLabels[e.id]](e.value) }';
}
} else {
ret += (SHOW_LABELS ? indent + '/* ' + block.entries[0] + ' */' : '') + '\n' + getLabelLines(block.labels[0], indent);
}
ret += '\n';
} else {
// Reloop multiple blocks using the compiled relooper
//Relooper.setDebug(1);
Relooper.init();
if (ASM_JS) Relooper.setAsmJSMode(1);
var blockMap = {};
// add blocks
for (var i = 0; i < block.labels.length; i++) {
var label = block.labels[i];
var content = getLabelLines(label, '', true);
//printErr(func.ident + ' : ' + label.ident + ' : ' + content + '\n');
blockMap[label.ident] = Relooper.addBlock(content);
}
// add branchings
function relevant(x) { return x && x.length > 2 ? x : 0 } // ignores ';' which valueJS and label*JS can be if empty
for (var i = 0; i < block.labels.length; i++) {
var label = block.labels[i];
var ident = label.ident;
var last = label.lines[label.lines.length-1];
//printErr('zz last ' + dump(last));
if (last.intertype == 'branch') {
if (last.label) { // 1 target
Relooper.addBranch(blockMap[ident], blockMap[last.label], 0, relevant(last.labelJS));
} else { // 2 targets
Relooper.addBranch(blockMap[ident], blockMap[last.labelTrue], last.valueJS, relevant(last.labelTrueJS));
Relooper.addBranch(blockMap[ident], blockMap[last.labelFalse], 0, relevant(last.labelFalseJS));
}
} else if (last.intertype == 'switch') {
last.groupedLabels.forEach(function(switchLabel) {
Relooper.addBranch(blockMap[ident], blockMap[switchLabel.label], switchLabel.value, relevant(switchLabel.labelJS));
});
Relooper.addBranch(blockMap[ident], blockMap[last.defaultLabel], 0, relevant(last.defaultLabelJS));
} else if (last.intertype == 'invoke') {
Relooper.addBranch(blockMap[ident], blockMap[last.toLabel], '!__THREW__', relevant(last.toLabelJS));
Relooper.addBranch(blockMap[ident], blockMap[last.unwindLabel], 0, relevant(last.unwindLabelJS));
} else if (last.intertype in RELOOP_IGNORED_LASTS) {
} else {
throw 'unknown reloop last line: ' + last.intertype;
}
}
ret += Relooper.render(blockMap[block.entries[0]]);
}
return ret;
}
func.JS += walkBlock(func.block, ' ');
// Finalize function
if (LABEL_DEBUG && functionNameFilterTest(func.ident)) func.JS += " INDENT = INDENT.substr(0, INDENT.length-2);\n";
// Ensure a return in a function with a type that returns, even if it lacks a return (e.g., if it aborts())
if (RELOOP && func.lines.length > 0 && func.returnType != 'void') {
var returns = func.labels.filter(function(label) { return label.lines[label.lines.length-1].intertype == 'return' }).length;
if (returns == 0) func.JS += ' return ' + asmCoercion('0', func.returnType);
}
func.JS += '}\n';
if (PRINT_SPLIT_FILE_MARKER) {
func.JS += '\n//FUNCTION_END_MARKER_OF_SOURCE_FILE_' + associatedSourceFile + '\n';
}
if (!ASM_JS && (EXPORT_ALL || (func.ident in EXPORTED_FUNCTIONS))) {
func.JS += 'Module["' + func.ident + '"] = ' + func.ident + ';';
}
if (!ASM_JS && INLINING_LIMIT && func.lines.length >= INLINING_LIMIT) {
func.JS += func.ident + '["X"]=1;';
}
if (BUILD_AS_SHARED_LIB == 2) {
// TODO: make the assert conditional on ASSERTIONS
func.JS += 'if (globalScope) { assert(!globalScope["' + func.ident + '"]); globalScope["' + func.ident + '"] = ' + func.ident + ' }';
}
func.JS = func.JS.replace(/\n *;/g, '\n'); // remove unneeded lines
return func;
}
});
function getVarData(funcData, ident) {
var local = funcData.variables[ident];
if (local) return local;
var global = Variables.globals[ident];
return global || null;
}
function getVarImpl(funcData, ident) {
if (ident === 'null' || isNumber(ident)) return VAR_NATIVIZED; // like nativized, in that we have the actual value right here
var data = getVarData(funcData, ident);
assert(data, 'What variable is this? |' + ident + '|');
return data.impl;
}
substrate.addActor('FuncLineTriager', {
processItem: function(item) {
if (item.intertype == 'function') {
this.forwardItem(item, 'FunctionReconstructor'); // XXX not really needed
} else if (item.JS) {
this.forwardItem(item, 'FunctionReconstructor'); // XXX not really needed
} else {
this.forwardItem(item, 'Intertype:' + item.intertype);
}
}
});
// An interitem that has |assignTo| is an assign to that item. They call this function which
// generates the actual assignment.
function makeAssign(item) {
var valueJS = item.JS;
item.JS = '';
if (CLOSURE_ANNOTATIONS) item.JS += '/** @type {number} */ ';
if (!ASM_JS || item.intertype != 'alloca' || item.funcData.variables[item.assignTo].impl == VAR_EMULATED) { // asm only needs non-allocas
item.JS += ((ASM_JS || item.overrideSSA) ? '' : 'var ') + toNiceIdent(item.assignTo);
}
var value = parseNumerical(valueJS);
var impl = getVarImpl(item.funcData, item.assignTo);
switch (impl) {
case VAR_NATIVE: {
break;
}
case VAR_NATIVIZED: {
// SSA, so this must be the alloca. No need for a value
if (!item.overrideSSA) value = '';
break;
}
case VAR_EMULATED: {
break;
}
default: throw 'zz unknown impl: ' + impl;
}
if (value && value != ';') {
item.JS += '=' + value;
}
if (item.JS[item.JS.length-1] != ';') {
item.JS += ';';
}
}
// Function lines
function makeFuncLineActor(intertype, func) {
return substrate.addActor('Intertype:' + intertype, {
processItem: function(item) {
item.JS = func(item);
if (!item.JS) throw "No JS generated for " + dump((item.funcData=null,item));
if (item.assignTo) {
makeAssign(item);
if (!item.JS) throw "No assign JS generated for " + dump(item);
}
this.forwardItem(item, 'FunctionReconstructor');
}
});
}
makeFuncLineActor('value', function(item) {
return item.ident;
});
makeFuncLineActor('noop', function(item) {
return ';';
});
makeFuncLineActor('var', function(item) { // assigns into phis become simple vars
return ASM_JS ? ';' : ('var ' + item.ident + ';');
});
makeFuncLineActor('store', function(item) {
var value = finalizeLLVMParameter(item.value);
if (pointingLevels(item.pointerType) == 1) {
value = parseNumerical(value, item.valueType);
}
var impl = VAR_EMULATED;
if (item.pointer.intertype == 'value') {
impl = getVarImpl(item.funcData, item.ident);
}
switch (impl) {
case VAR_NATIVIZED:
if (isNumber(item.ident)) {
// Direct write to a memory address; this may be an intentional segfault, if not, it is a bug in the source
if (ASM_JS) {
return 'abort(' + item.ident + ')';
} else {
return 'throw "fault on write to ' + item.ident + '";';
}
}
return item.ident + '=' + value + ';'; // We have the actual value here
break;
case VAR_EMULATED:
if (item.pointer.intertype == 'value') {
return makeSetValue(makeGlobalUse(item.ident), 0, value, item.valueType, 0, 0, item.align) + ';';
} else {
return makeSetValue(0, finalizeLLVMParameter(item.pointer), value, item.valueType, 0, 0, item.align) + ';';
}
break;
default:
throw 'unknown [store] impl: ' + impl;
}
return null;
});
makeFuncLineActor('deleted', function(item) { return ';' });
function getOriginalLabelId(label) {
var funcData = Framework.currItem.funcData;
var labelIdsInverse = funcData.labelIdsInverse;
return labelIdsInverse[label];
}
function getLabelId(label) {
return label;
}
function makeBranch(label, lastLabel, labelIsVariable) { // lastLabel is deprecated
var pre = '';
if (label[0] == 'B') {
assert(!labelIsVariable, 'Cannot handle branches to variables with special branching options');
var parts = label.split('|');
var trueLabel = parts[1] || '';
var oldLabel = parts[2] || '';
var labelSetting = oldLabel ? 'label = ' + getLabelId(oldLabel) + ';' +
(SHOW_LABELS ? ' /* to: ' + getOriginalLabelId(cleanLabel(oldLabel)) + ' */' : '') : ''; // TODO: optimize away the setting
if (label[1] == 'R') {
if (label[2] == 'N') { // BRNOL: break, no label setting
labelSetting = '';
}
return pre + labelSetting + 'break ' + trueLabel + ';';
} else if (label[1] == 'C') { // CONT
if (label[2] == 'N') { // BCNOL: continue, no label setting
labelSetting = '';
}
return pre + labelSetting + 'continue ' + trueLabel + ';';
} else if (label[1] == 'N') { // NOPP
return pre + ';'; // Returning no text might confuse this parser
} else if (label[1] == 'J') { // JSET
return pre + labelSetting + ';';
} else {
throw 'Invalid B-op in branch: ' + trueLabel + ',' + oldLabel;
}
} else {
if (!labelIsVariable) label = getLabelId(label);
return pre + 'label = ' + label + ';' + (SHOW_LABELS ? ' /* to: ' + getOriginalLabelId(cleanLabel(label)) + ' */' : '') + ' break;';
}
}
function calcPhiSets(item) {
if (!item.phi) return null;
var phiSets = {};
item.dependent.params.forEach(function(param) {
if (!phiSets[param.targetLabel]) phiSets[param.targetLabel] = [];
phiSets[param.targetLabel].push(param);
param.valueJS = finalizeLLVMParameter(param.value);
});
return phiSets;