source: src/CodeGen/CodeGenerator.cc@ bf30ab3

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new with_gc
Last change on this file since bf30ab3 was 9a1e509, checked in by Rob Schluntz <rschlunt@…>, 8 years ago

Merge branch 'master' into references
  • Property mode set to 100644
File size: 29.8 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// CodeGenerator.cc --
8//
9// Author : Richard C. Bilson
10// Created On : Mon May 18 07:44:20 2015
11// Last Modified By : Andrew Beach
12// Last Modified On : Thu Jun 8 16:00:00 2017
13// Update Count : 485
14//
15
16#include <cassert> // for assert, assertf
17#include <list> // for _List_iterator, list, list<>::it...
18
19#include "CodeGenerator.h"
20#include "Common/SemanticError.h" // for SemanticError
21#include "Common/UniqueName.h" // for UniqueName
22#include "Common/utility.h" // for CodeLocation, toString
23#include "GenType.h" // for genType
24#include "InitTweak/InitTweak.h" // for getPointerBase
25#include "OperatorTable.h" // for OperatorInfo, operatorLookup
26#include "Parser/LinkageSpec.h" // for Spec, Intrinsic
27#include "SynTree/Attribute.h" // for Attribute
28#include "SynTree/BaseSyntaxNode.h" // for BaseSyntaxNode
29#include "SynTree/Constant.h" // for Constant
30#include "SynTree/Declaration.h" // for DeclarationWithType, TypeDecl
31#include "SynTree/Expression.h" // for Expression, UntypedExpr, Applica...
32#include "SynTree/Initializer.h" // for Initializer, ListInit, Designation
33#include "SynTree/Label.h" // for Label, operator<<
34#include "SynTree/Statement.h" // for Statement, AsmStmt, BranchStmt
35#include "SynTree/Type.h" // for Type, Type::StorageClasses, Func...
36
37using namespace std;
38
39namespace CodeGen {
40 int CodeGenerator::tabsize = 4;
41
42 // the kinds of statements that would ideally be followed by whitespace
43 bool wantSpacing( Statement * stmt) {
44 return dynamic_cast< IfStmt * >( stmt ) || dynamic_cast< CompoundStmt * >( stmt ) ||
45 dynamic_cast< WhileStmt * >( stmt ) || dynamic_cast< ForStmt * >( stmt ) || dynamic_cast< SwitchStmt *>( stmt );
46 }
47
48 void CodeGenerator::extension( Expression * expr ) {
49 if ( expr->get_extension() ) {
50 output << "__extension__ ";
51 } // if
52 } // extension
53
54 void CodeGenerator::extension( Declaration * decl ) {
55 if ( decl->get_extension() ) {
56 output << "__extension__ ";
57 } // if
58 } // extension
59
60 void CodeGenerator::asmName( DeclarationWithType * decl ) {
61 if ( ConstantExpr * asmName = decl->get_asmName() ) {
62 output << " asm ( " << asmName->get_constant()->get_value() << " )";
63 } // if
64 } // extension
65
66 CodeGenerator::LabelPrinter & CodeGenerator::LabelPrinter::operator()( std::list< Label > & l ) {
67 labels = &l;
68 return *this;
69 }
70
71 ostream & operator<<( ostream & output, CodeGenerator::LabelPrinter & printLabels ) {
72 std::list< Label > & labs = *printLabels.labels;
73 // l.unique(); // assumes a sorted list. Why not use set? Does order matter?
74 for ( Label & l : labs ) {
75 output << l.get_name() + ": ";
76 printLabels.cg.genAttributes( l.get_attributes() );
77 } // for
78 return output;
79 }
80
81 CodeGenerator::LineMarker::LineMarker(
82 CodeLocation const & loc, bool toPrint) :
83 loc(loc), toPrint(toPrint)
84 {}
85
86 CodeGenerator::LineMarker CodeGenerator::lineDirective(
87 BaseSyntaxNode const * node) {
88 return LineMarker(node->location, lineMarks);
89 }
90
91 std::ostream & operator<<(std::ostream & out,
92 CodeGenerator::LineMarker const & marker) {
93 if (marker.toPrint && marker.loc.isSet()) {
94 return out << "\n# " << marker.loc.linenumber << " \""
95 << marker.loc.filename << "\"\n";
96 } else if (marker.toPrint) {
97 return out << "\n/* Missing CodeLocation */\n";
98 } else {
99 return out;
100 }
101 }
102
103 CodeGenerator::CodeGenerator( std::ostream & os, bool pretty, bool genC, bool lineMarks ) : indent( CodeGenerator::tabsize ), insideFunction( false ), output( os ), printLabels( *this ), pretty( pretty ), genC( genC ), lineMarks( lineMarks ) {}
104
105 string CodeGenerator::mangleName( DeclarationWithType * decl ) {
106 if ( pretty ) return decl->get_name();
107 if ( decl->get_mangleName() != "" ) {
108 // need to incorporate scope level in order to differentiate names for destructors
109 return decl->get_scopedMangleName();
110 } else {
111 return decl->get_name();
112 } // if
113 }
114
115 void CodeGenerator::genAttributes( list< Attribute * > & attributes ) {
116 if ( attributes.empty() ) return;
117 output << "__attribute__ ((";
118 for ( list< Attribute * >::iterator attr( attributes.begin() );; ) {
119 output << (*attr)->get_name();
120 if ( ! (*attr)->get_parameters().empty() ) {
121 output << "(";
122 genCommaList( (*attr)->get_parameters().begin(), (*attr)->get_parameters().end() );
123 output << ")";
124 } // if
125 if ( ++attr == attributes.end() ) break;
126 output << ","; // separator
127 } // for
128 output << ")) ";
129 } // CodeGenerator::genAttributes
130
131
132 // *** Declarations
133 void CodeGenerator::visit( FunctionDecl * functionDecl ) {
134 extension( functionDecl );
135 genAttributes( functionDecl->get_attributes() );
136
137 handleStorageClass( functionDecl );
138 functionDecl->get_funcSpec().print( output );
139
140 output << genType( functionDecl->get_functionType(), mangleName( functionDecl ), pretty, genC );
141
142 asmName( functionDecl );
143
144 // acceptAll( functionDecl->get_oldDecls(), *this );
145 if ( functionDecl->get_statements() ) {
146 functionDecl->get_statements()->accept( *this );
147 } // if
148 }
149
150 void CodeGenerator::visit( ObjectDecl * objectDecl ) {
151 if (objectDecl->get_name().empty() && genC ) {
152 // only generate an anonymous name when generating C code, otherwise it clutters the output too much
153 static UniqueName name = { "__anonymous_object" };
154 objectDecl->set_name( name.newName() );
155 }
156
157 extension( objectDecl );
158 genAttributes( objectDecl->get_attributes() );
159
160 handleStorageClass( objectDecl );
161 output << genType( objectDecl->get_type(), mangleName( objectDecl ), pretty, genC );
162
163 asmName( objectDecl );
164
165 if ( objectDecl->get_init() ) {
166 output << " = ";
167 objectDecl->get_init()->accept( *this );
168 } // if
169
170 if ( objectDecl->get_bitfieldWidth() ) {
171 output << ":";
172 objectDecl->get_bitfieldWidth()->accept( *this );
173 } // if
174 }
175
176 void CodeGenerator::handleAggregate( AggregateDecl * aggDecl, const std::string & kind ) {
177 genAttributes( aggDecl->get_attributes() );
178
179 if( ! aggDecl->get_parameters().empty() && ! genC ) {
180 // assertf( ! genC, "Aggregate type parameters should not reach code generation." );
181 output << "forall(";
182 genCommaList( aggDecl->get_parameters().begin(), aggDecl->get_parameters().end() );
183 output << ")" << endl;
184 }
185
186 output << kind;
187 if ( aggDecl->get_name() != "" )
188 output << aggDecl->get_name();
189
190 if ( aggDecl->has_body() ) {
191 std::list< Declaration * > & memb = aggDecl->get_members();
192 output << " {" << endl;
193
194 ++indent;
195 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
196 output << lineDirective( *i ) << indent;
197 (*i)->accept( *this );
198 output << ";" << endl;
199 } // for
200
201 --indent;
202
203 output << indent << "}";
204 } // if
205 }
206
207 void CodeGenerator::visit( StructDecl * structDecl ) {
208 extension( structDecl );
209 handleAggregate( structDecl, "struct " );
210 }
211
212 void CodeGenerator::visit( UnionDecl * unionDecl ) {
213 extension( unionDecl );
214 handleAggregate( unionDecl, "union " );
215 }
216
217 void CodeGenerator::visit( EnumDecl * enumDecl ) {
218 extension( enumDecl );
219 output << lineDirective ( enumDecl );
220 output << "enum ";
221 genAttributes( enumDecl->get_attributes() );
222
223 if ( enumDecl->get_name() != "" )
224 output << enumDecl->get_name();
225
226 std::list< Declaration* > &memb = enumDecl->get_members();
227
228 if ( ! memb.empty() ) {
229 output << " {" << endl;
230
231 ++indent;
232 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
233 ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
234 assert( obj );
235 output << lineDirective( obj ) << indent << mangleName( obj );
236 if ( obj->get_init() ) {
237 output << " = ";
238 obj->get_init()->accept( *this );
239 } // if
240 output << "," << endl;
241 } // for
242
243 --indent;
244
245 output << indent << "}";
246 } // if
247 }
248
249 void CodeGenerator::visit( __attribute__((unused)) TraitDecl * traitDecl ) {}
250
251 void CodeGenerator::visit( TypedefDecl * typeDecl ) {
252 assertf( ! genC, "Typedefs are removed and substituted in earlier passes." );
253 output << lineDirective( typeDecl );
254 output << "typedef ";
255 output << genType( typeDecl->get_base(), typeDecl->get_name(), pretty, genC ) << endl;
256 }
257
258 void CodeGenerator::visit( TypeDecl * typeDecl ) {
259 if ( genC ) {
260 // really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
261 // still to be done
262 extension( typeDecl );
263 output << "extern unsigned long " << typeDecl->get_name();
264 if ( typeDecl->get_base() ) {
265 output << " = sizeof( " << genType( typeDecl->get_base(), "", pretty, genC ) << " )";
266 } // if
267 } else {
268 output << typeDecl->genTypeString() << " " << typeDecl->get_name();
269 if ( typeDecl->get_kind() != TypeDecl::Any && typeDecl->get_sized() ) {
270 output << " | sized(" << typeDecl->get_name() << ")";
271 }
272 if ( ! typeDecl->get_assertions().empty() ) {
273 output << " | { ";
274 genCommaList( typeDecl->get_assertions().begin(), typeDecl->get_assertions().end() );
275 output << " }";
276 }
277 }
278 }
279
280 void CodeGenerator::visit( Designation * designation ) {
281 std::list< Expression * > designators = designation->get_designators();
282 if ( designators.size() == 0 ) return;
283 for ( Expression * des : designators ) {
284 if ( dynamic_cast< NameExpr * >( des ) || dynamic_cast< VariableExpr * >( des ) ) {
285 // if expression is a NameExpr or VariableExpr, then initializing aggregate member
286 output << ".";
287 des->accept( *this );
288 } else {
289 // otherwise, it has to be a ConstantExpr or CastExpr, initializing array eleemnt
290 output << "[";
291 des->accept( *this );
292 output << "]";
293 } // if
294 } // for
295 output << " = ";
296 }
297
298 void CodeGenerator::visit( SingleInit * init ) {
299 init->get_value()->accept( *this );
300 }
301
302 void CodeGenerator::visit( ListInit * init ) {
303 auto initBegin = init->begin();
304 auto initEnd = init->end();
305 auto desigBegin = init->get_designations().begin();
306 auto desigEnd = init->get_designations().end();
307
308 output << "{ ";
309 for ( ; initBegin != initEnd && desigBegin != desigEnd; ) {
310 (*desigBegin)->accept( *this );
311 (*initBegin)->accept( *this );
312 ++initBegin, ++desigBegin;
313 if ( initBegin != initEnd ) {
314 output << ", ";
315 }
316 }
317 output << " }";
318 assertf( initBegin == initEnd && desigBegin == desigEnd, "Initializers and designators not the same length. %s", toString( init ).c_str() );
319 }
320
321 void CodeGenerator::visit( __attribute__((unused)) ConstructorInit * init ){
322 assertf( ! genC, "ConstructorInit nodes should not reach code generation." );
323 // xxx - generate something reasonable for constructor/destructor pairs
324 output << "<ctorinit>";
325 }
326
327 void CodeGenerator::visit( Constant * constant ) {
328 output << constant->get_value() ;
329 }
330
331 // *** Expressions
332 void CodeGenerator::visit( ApplicationExpr * applicationExpr ) {
333 extension( applicationExpr );
334 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
335 OperatorInfo opInfo;
336 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
337 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
338 switch ( opInfo.type ) {
339 case OT_INDEX:
340 assert( applicationExpr->get_args().size() == 2 );
341 (*arg++)->accept( *this );
342 output << "[";
343 (*arg)->accept( *this );
344 output << "]";
345 break;
346
347 case OT_CALL:
348 // there are no intrinsic definitions of the function call operator
349 assert( false );
350 break;
351
352 case OT_CTOR:
353 case OT_DTOR:
354 if ( applicationExpr->get_args().size() == 1 ) {
355 // the expression fed into a single parameter constructor or destructor may contain side
356 // effects, so must still output this expression
357 output << "(";
358 (*arg++)->accept( *this );
359 output << ") /* " << opInfo.inputName << " */";
360 } else if ( applicationExpr->get_args().size() == 2 ) {
361 // intrinsic two parameter constructors are essentially bitwise assignment
362 output << "(";
363 (*arg++)->accept( *this );
364 output << opInfo.symbol;
365 (*arg)->accept( *this );
366 output << ") /* " << opInfo.inputName << " */";
367 } else {
368 // no constructors with 0 or more than 2 parameters
369 assert( false );
370 } // if
371 break;
372
373 case OT_PREFIX:
374 case OT_PREFIXASSIGN:
375 assert( applicationExpr->get_args().size() == 1 );
376 output << "(";
377 output << opInfo.symbol;
378 (*arg)->accept( *this );
379 output << ")";
380 break;
381
382 case OT_POSTFIX:
383 case OT_POSTFIXASSIGN:
384 assert( applicationExpr->get_args().size() == 1 );
385 (*arg)->accept( *this );
386 output << opInfo.symbol;
387 break;
388
389
390 case OT_INFIX:
391 case OT_INFIXASSIGN:
392 assert( applicationExpr->get_args().size() == 2 );
393 output << "(";
394 (*arg++)->accept( *this );
395 output << opInfo.symbol;
396 (*arg)->accept( *this );
397 output << ")";
398 break;
399
400 case OT_CONSTANT:
401 case OT_LABELADDRESS:
402 // there are no intrinsic definitions of 0/1 or label addresses as functions
403 assert( false );
404 } // switch
405 } else {
406 varExpr->accept( *this );
407 output << "(";
408 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
409 output << ")";
410 } // if
411 } else {
412 applicationExpr->get_function()->accept( *this );
413 output << "(";
414 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
415 output << ")";
416 } // if
417 }
418
419 void CodeGenerator::visit( UntypedExpr * untypedExpr ) {
420 extension( untypedExpr );
421 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
422 OperatorInfo opInfo;
423 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
424 std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
425 switch ( opInfo.type ) {
426 case OT_INDEX:
427 assert( untypedExpr->get_args().size() == 2 );
428 (*arg++)->accept( *this );
429 output << "[";
430 (*arg)->accept( *this );
431 output << "]";
432 break;
433
434 case OT_CALL:
435 assert( false );
436
437 case OT_CTOR:
438 case OT_DTOR:
439 if ( untypedExpr->get_args().size() == 1 ) {
440 // the expression fed into a single parameter constructor or destructor may contain side
441 // effects, so must still output this expression
442 output << "(";
443 (*arg++)->accept( *this );
444 output << ") /* " << opInfo.inputName << " */";
445 } else if ( untypedExpr->get_args().size() == 2 ) {
446 // intrinsic two parameter constructors are essentially bitwise assignment
447 output << "(";
448 (*arg++)->accept( *this );
449 output << opInfo.symbol;
450 (*arg)->accept( *this );
451 output << ") /* " << opInfo.inputName << " */";
452 } else {
453 // no constructors with 0 or more than 2 parameters
454 assert( false );
455 } // if
456 break;
457
458 case OT_PREFIX:
459 case OT_PREFIXASSIGN:
460 case OT_LABELADDRESS:
461 assert( untypedExpr->get_args().size() == 1 );
462 output << "(";
463 output << opInfo.symbol;
464 (*arg)->accept( *this );
465 output << ")";
466 break;
467
468 case OT_POSTFIX:
469 case OT_POSTFIXASSIGN:
470 assert( untypedExpr->get_args().size() == 1 );
471 (*arg)->accept( *this );
472 output << opInfo.symbol;
473 break;
474
475 case OT_INFIX:
476 case OT_INFIXASSIGN:
477 assert( untypedExpr->get_args().size() == 2 );
478 output << "(";
479 (*arg++)->accept( *this );
480 output << opInfo.symbol;
481 (*arg)->accept( *this );
482 output << ")";
483 break;
484
485 case OT_CONSTANT:
486 // there are no intrinsic definitions of 0 or 1 as functions
487 assert( false );
488 } // switch
489 } else {
490 if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
491 assert( untypedExpr->get_args().size() == 2 );
492 (*untypedExpr->get_args().begin())->accept( *this );
493 output << " ... ";
494 (*--untypedExpr->get_args().end())->accept( *this );
495 } else { // builtin routines
496 nameExpr->accept( *this );
497 output << "(";
498 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
499 output << ")";
500 } // if
501 } // if
502 } else {
503 untypedExpr->get_function()->accept( *this );
504 output << "(";
505 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
506 output << ")";
507 } // if
508 }
509
510 void CodeGenerator::visit( RangeExpr * rangeExpr ) {
511 rangeExpr->get_low()->accept( *this );
512 output << " ... ";
513 rangeExpr->get_high()->accept( *this );
514 }
515
516 void CodeGenerator::visit( NameExpr * nameExpr ) {
517 extension( nameExpr );
518 OperatorInfo opInfo;
519 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
520 assert( opInfo.type == OT_CONSTANT );
521 output << opInfo.symbol;
522 } else {
523 output << nameExpr->get_name();
524 } // if
525 }
526
527 void CodeGenerator::visit( AddressExpr * addressExpr ) {
528 extension( addressExpr );
529 output << "(&";
530 // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
531 if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
532 output << mangleName( variableExpr->get_var() );
533 } else {
534 addressExpr->get_arg()->accept( *this );
535 } // if
536 output << ")";
537 }
538
539 void CodeGenerator::visit( CastExpr * castExpr ) {
540 extension( castExpr );
541 output << "(";
542 if ( castExpr->get_result()->isVoid() ) {
543 output << "(void)" ;
544 } else if ( ! castExpr->get_result()->get_lvalue() ) {
545 // at least one result type of cast, but not an lvalue
546 output << "(";
547 output << genType( castExpr->get_result(), "", pretty, genC );
548 output << ")";
549 } else {
550 // otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
551 // never an lvalue in C
552 } // if
553 castExpr->get_arg()->accept( *this );
554 output << ")";
555 }
556
557 void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) {
558 assertf( ! genC, "UntypedMemberExpr should not reach code generation." );
559 extension( memberExpr );
560 memberExpr->get_aggregate()->accept( *this );
561 output << ".";
562 memberExpr->get_member()->accept( *this );
563 }
564
565 void CodeGenerator::visit( MemberExpr * memberExpr ) {
566 extension( memberExpr );
567 memberExpr->get_aggregate()->accept( *this );
568 output << "." << mangleName( memberExpr->get_member() );
569 }
570
571 void CodeGenerator::visit( VariableExpr * variableExpr ) {
572 extension( variableExpr );
573 OperatorInfo opInfo;
574 if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
575 output << opInfo.symbol;
576 } else {
577 output << mangleName( variableExpr->get_var() );
578 } // if
579 }
580
581 void CodeGenerator::visit( ConstantExpr * constantExpr ) {
582 assert( constantExpr->get_constant() );
583 extension( constantExpr );
584 constantExpr->get_constant()->accept( *this );
585 }
586
587 void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
588 extension( sizeofExpr );
589 output << "sizeof(";
590 if ( sizeofExpr->get_isType() ) {
591 output << genType( sizeofExpr->get_type(), "", pretty, genC );
592 } else {
593 sizeofExpr->get_expr()->accept( *this );
594 } // if
595 output << ")";
596 }
597
598 void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
599 // use GCC extension to avoid bumping std to C11
600 extension( alignofExpr );
601 output << "__alignof__(";
602 if ( alignofExpr->get_isType() ) {
603 output << genType( alignofExpr->get_type(), "", pretty, genC );
604 } else {
605 alignofExpr->get_expr()->accept( *this );
606 } // if
607 output << ")";
608 }
609
610 void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
611 assertf( ! genC, "UntypedOffsetofExpr should not reach code generation." );
612 output << "offsetof(";
613 output << genType( offsetofExpr->get_type(), "", pretty, genC );
614 output << ", " << offsetofExpr->get_member();
615 output << ")";
616 }
617
618 void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
619 // use GCC builtin
620 output << "__builtin_offsetof(";
621 output << genType( offsetofExpr->get_type(), "", pretty, genC );
622 output << ", " << mangleName( offsetofExpr->get_member() );
623 output << ")";
624 }
625
626 void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
627 assertf( ! genC, "OffsetPackExpr should not reach code generation." );
628 output << "__CFA_offsetpack(" << genType( offsetPackExpr->get_type(), "", pretty, genC ) << ")";
629 }
630
631 void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
632 extension( logicalExpr );
633 output << "(";
634 logicalExpr->get_arg1()->accept( *this );
635 if ( logicalExpr->get_isAnd() ) {
636 output << " && ";
637 } else {
638 output << " || ";
639 } // if
640 logicalExpr->get_arg2()->accept( *this );
641 output << ")";
642 }
643
644 void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
645 extension( conditionalExpr );
646 output << "(";
647 conditionalExpr->get_arg1()->accept( *this );
648 output << " ? ";
649 conditionalExpr->get_arg2()->accept( *this );
650 output << " : ";
651 conditionalExpr->get_arg3()->accept( *this );
652 output << ")";
653 }
654
655 void CodeGenerator::visit( CommaExpr * commaExpr ) {
656 extension( commaExpr );
657 output << "(";
658 commaExpr->get_arg1()->accept( *this );
659 output << " , ";
660 commaExpr->get_arg2()->accept( *this );
661 output << ")";
662 }
663
664 void CodeGenerator::visit( UntypedTupleExpr * tupleExpr ) {
665 assertf( ! genC, "UntypedTupleExpr should not reach code generation." );
666 extension( tupleExpr );
667 output << "[";
668 genCommaList( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end() );
669 output << "]";
670 }
671
672 void CodeGenerator::visit( TupleExpr * tupleExpr ) {
673 assertf( ! genC, "TupleExpr should not reach code generation." );
674 extension( tupleExpr );
675 output << "[";
676 genCommaList( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end() );
677 output << "]";
678 }
679
680 void CodeGenerator::visit( TupleIndexExpr * tupleExpr ) {
681 assertf( ! genC, "TupleIndexExpr should not reach code generation." );
682 extension( tupleExpr );
683 tupleExpr->get_tuple()->accept( *this );
684 output << "." << tupleExpr->get_index();
685 }
686
687 void CodeGenerator::visit( TypeExpr * typeExpr ) {
688 // if ( genC ) std::cerr << "typeexpr still exists: " << typeExpr << std::endl;
689 // assertf( ! genC, "TypeExpr should not reach code generation." );
690 if ( ! genC ) {
691 output<< genType( typeExpr->get_type(), "", pretty, genC );
692 }
693 }
694
695 void CodeGenerator::visit( AsmExpr * asmExpr ) {
696 if ( asmExpr->get_inout() ) {
697 output << "[ ";
698 asmExpr->get_inout()->accept( *this );
699 output << " ] ";
700 } // if
701 asmExpr->get_constraint()->accept( *this );
702 output << " ( ";
703 asmExpr->get_operand()->accept( *this );
704 output << " )";
705 }
706
707 void CodeGenerator::visit( CompoundLiteralExpr *compLitExpr ) {
708 assert( compLitExpr->get_result() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
709 output << "(" << genType( compLitExpr->get_result(), "", pretty, genC ) << ")";
710 compLitExpr->get_initializer()->accept( *this );
711 }
712
713 void CodeGenerator::visit( StmtExpr * stmtExpr ) {
714 std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
715 output << lineDirective( stmtExpr) << "({" << std::endl;
716 ++indent;
717 unsigned int numStmts = stmts.size();
718 unsigned int i = 0;
719 for ( Statement * stmt : stmts ) {
720 output << lineDirective( stmt ) << indent;
721 output << printLabels( stmt->get_labels() );
722 if ( i+1 == numStmts ) {
723 // last statement in a statement expression needs to be handled specially -
724 // cannot cast to void, otherwise the expression statement has no value
725 if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
726 exprStmt->get_expr()->accept( *this );
727 output << ";" << endl;
728 ++i;
729 break;
730 }
731 }
732 stmt->accept( *this );
733 output << endl;
734 if ( wantSpacing( stmt ) ) {
735 output << endl;
736 } // if
737 ++i;
738 }
739 --indent;
740 output << indent << "})";
741 }
742
743 // *** Statements
744 void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
745 std::list<Statement*> ks = compoundStmt->get_kids();
746 output << "{" << endl;
747
748 ++indent;
749
750 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
751 output << indent << printLabels( (*i)->get_labels() );
752 (*i)->accept( *this );
753
754 output << endl;
755 if ( wantSpacing( *i ) ) {
756 output << endl;
757 } // if
758 } // for
759 --indent;
760
761 output << indent << "}";
762 }
763
764 void CodeGenerator::visit( ExprStmt * exprStmt ) {
765 assert( exprStmt );
766 Expression * expr = exprStmt->get_expr();
767 if ( genC ) {
768 // cast the top-level expression to void to reduce gcc warnings.
769 expr = new CastExpr( expr );
770 }
771 expr->accept( *this );
772 output << ";";
773 }
774
775 void CodeGenerator::visit( AsmStmt * asmStmt ) {
776 output << "asm ";
777 if ( asmStmt->get_voltile() ) output << "volatile ";
778 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
779 output << "( ";
780 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
781 output << " : ";
782 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
783 output << " : ";
784 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
785 output << " : ";
786 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
787 if ( ! asmStmt->get_gotolabels().empty() ) {
788 output << " : ";
789 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
790 output << *begin++;
791 if ( begin == asmStmt->get_gotolabels().end() ) break;
792 output << ", ";
793 } // for
794 } // if
795 output << " );" ;
796 }
797
798 void CodeGenerator::visit( AsmDecl * asmDecl ) {
799 output << "asm ";
800 AsmStmt * asmStmt = asmDecl->get_stmt();
801 output << "( ";
802 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
803 output << " )" ;
804 }
805
806 void CodeGenerator::visit( IfStmt * ifStmt ) {
807 output << lineDirective( ifStmt );
808 output << "if ( ";
809 ifStmt->get_condition()->accept( *this );
810 output << " ) ";
811
812 ifStmt->get_thenPart()->accept( *this );
813
814 if ( ifStmt->get_elsePart() != 0) {
815 output << " else ";
816 ifStmt->get_elsePart()->accept( *this );
817 } // if
818 }
819
820 void CodeGenerator::visit( SwitchStmt * switchStmt ) {
821 output << lineDirective( switchStmt );
822 output << "switch ( " ;
823 switchStmt->get_condition()->accept( *this );
824 output << " ) ";
825
826 output << "{" << std::endl;
827 ++indent;
828 acceptAll( switchStmt->get_statements(), *this );
829 --indent;
830 output << indent << "}";
831 }
832
833 void CodeGenerator::visit( CaseStmt * caseStmt ) {
834 output << lineDirective( caseStmt );
835 output << indent;
836 if ( caseStmt->isDefault()) {
837 output << "default";
838 } else {
839 output << "case ";
840 caseStmt->get_condition()->accept( *this );
841 } // if
842 output << ":\n";
843
844 std::list<Statement *> sts = caseStmt->get_statements();
845
846 ++indent;
847 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
848 output << indent << printLabels( (*i)->get_labels() ) ;
849 (*i)->accept( *this );
850 output << endl;
851 } // for
852 --indent;
853 }
854
855 void CodeGenerator::visit( BranchStmt * branchStmt ) {
856 switch ( branchStmt->get_type()) {
857 case BranchStmt::Goto:
858 if ( ! branchStmt->get_target().empty() )
859 output << "goto " << branchStmt->get_target();
860 else {
861 if ( branchStmt->get_computedTarget() != 0 ) {
862 output << "goto *";
863 branchStmt->get_computedTarget()->accept( *this );
864 } // if
865 } // if
866 break;
867 case BranchStmt::Break:
868 output << "break";
869 break;
870 case BranchStmt::Continue:
871 output << "continue";
872 break;
873 } // switch
874 output << ";";
875 }
876
877 void CodeGenerator::visit( ReturnStmt * returnStmt ) {
878 output << "return ";
879 maybeAccept( returnStmt->get_expr(), *this );
880 output << ";";
881 }
882
883 void CodeGenerator::visit( ThrowStmt * throwStmt ) {
884 assertf( ! genC, "Throw statements should not reach code generation." );
885
886 output << ((throwStmt->get_kind() == ThrowStmt::Terminate) ?
887 "throw" : "throwResume");
888 if (throwStmt->get_expr()) {
889 output << " ";
890 throwStmt->get_expr()->accept( *this );
891 }
892 if (throwStmt->get_target()) {
893 output << " _At ";
894 throwStmt->get_target()->accept( *this );
895 }
896 output << ";";
897 }
898
899 void CodeGenerator::visit( WhileStmt * whileStmt ) {
900 if ( whileStmt->get_isDoWhile() ) {
901 output << "do" ;
902 } else {
903 output << "while (" ;
904 whileStmt->get_condition()->accept( *this );
905 output << ")";
906 } // if
907 output << " ";
908
909 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
910 whileStmt->get_body()->accept( *this );
911
912 output << indent;
913
914 if ( whileStmt->get_isDoWhile() ) {
915 output << " while (" ;
916 whileStmt->get_condition()->accept( *this );
917 output << ");";
918 } // if
919 }
920
921 void CodeGenerator::visit( ForStmt * forStmt ) {
922 // initialization is always hoisted, so don't bother doing anything with that
923 output << "for (;";
924
925 if ( forStmt->get_condition() != 0 ) {
926 forStmt->get_condition()->accept( *this );
927 } // if
928 output << ";";
929
930 if ( forStmt->get_increment() != 0 ) {
931 // cast the top-level expression to void to reduce gcc warnings.
932 Expression * expr = new CastExpr( forStmt->get_increment() );
933 expr->accept( *this );
934 } // if
935 output << ") ";
936
937 if ( forStmt->get_body() != 0 ) {
938 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
939 forStmt->get_body()->accept( *this );
940 } // if
941 }
942
943 void CodeGenerator::visit( __attribute__((unused)) NullStmt * nullStmt ) {
944 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
945 output << "/* null statement */ ;";
946 }
947
948 void CodeGenerator::visit( DeclStmt * declStmt ) {
949 declStmt->get_decl()->accept( *this );
950
951 if ( doSemicolon( declStmt->get_decl() ) ) {
952 output << ";";
953 } // if
954 }
955
956 void CodeGenerator::handleStorageClass( DeclarationWithType * decl ) {
957 if ( decl->get_storageClasses().any() ) {
958 decl->get_storageClasses().print( output );
959 } // if
960 } // CodeGenerator::handleStorageClass
961
962 std::string genName( DeclarationWithType * decl ) {
963 CodeGen::OperatorInfo opInfo;
964 if ( operatorLookup( decl->get_name(), opInfo ) ) {
965 return opInfo.outputName;
966 } else {
967 return decl->get_name();
968 } // if
969 }
970} // namespace CodeGen
971
972// Local Variables: //
973// tab-width: 4 //
974// mode: c++ //
975// compile-command: "make install" //
976// End: //
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