source: src/CodeGen/CodeGenerator.cc@ 3f869f0

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors ctor deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox memory 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 3f869f0 was 8e9cbb2, checked in by Peter A. Buhr <pabuhr@…>, 9 years ago

add more code to handle gcc extension and test program, second attempt
  • Property mode set to 100644
File size: 24.5 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 : Peter A. Buhr
12// Last Modified On : Mon Jul 4 20:38:32 2016
13// Update Count : 300
14//
15
16#include <algorithm>
17#include <iostream>
18#include <cassert>
19#include <list>
20
21#include "Parser/ParseNode.h"
22
23#include "SynTree/Declaration.h"
24#include "SynTree/Expression.h"
25#include "SynTree/Initializer.h"
26#include "SynTree/Statement.h"
27#include "SynTree/Type.h"
28#include "SynTree/Attribute.h"
29
30#include "Common/utility.h"
31#include "Common/UnimplementedError.h"
32
33#include "CodeGenerator.h"
34#include "OperatorTable.h"
35#include "GenType.h"
36
37#include "InitTweak/InitTweak.h"
38
39using namespace std;
40
41namespace CodeGen {
42 int CodeGenerator::tabsize = 4;
43
44 // the kinds of statements that would ideally be followed by whitespace
45 bool wantSpacing( Statement * stmt) {
46 return dynamic_cast< IfStmt * >( stmt ) || dynamic_cast< CompoundStmt * >( stmt ) ||
47 dynamic_cast< WhileStmt * >( stmt ) || dynamic_cast< ForStmt * > ( stmt ) || dynamic_cast< SwitchStmt *>( stmt );
48 }
49
50 void CodeGenerator::extension( Expression *expr ) {
51 if ( expr->get_extension() ) {
52 output << "__extension__ ";
53 } // if
54 } // extension
55
56 void CodeGenerator::extension( Declaration *decl ) {
57 if ( decl->get_extension() ) {
58 output << "__extension__ ";
59 } // if
60 } // extension
61
62 ostream & CodeGenerator::Indenter::operator()( ostream & output ) const {
63 return output << string( cg.cur_indent, ' ' );
64 }
65
66 ostream & operator<<( ostream & output, const CodeGenerator::Indenter &indent ) {
67 return indent( output );
68 }
69
70 CodeGenerator::LabelPrinter & CodeGenerator::LabelPrinter::operator()( std::list< Label > & l ) {
71 labels = &l;
72 return *this;
73 }
74
75 ostream & operator<<( ostream & output, CodeGenerator::LabelPrinter &printLabels ) {
76 std::list< Label > & labs = *printLabels.labels;
77 // l.unique(); // assumes a sorted list. Why not use set? Does order matter?
78 for ( Label & l : labs ) {
79 output << l.get_name() + ": ";
80 printLabels.cg.genAttributes( l.get_attributes() );
81 }
82 return output;
83 }
84
85 CodeGenerator::CodeGenerator( std::ostream &os ) : indent( *this), cur_indent( 0 ), insideFunction( false ), output( os ), printLabels( *this ) { }
86
87 CodeGenerator::CodeGenerator( std::ostream &os, std::string init, int indentation, bool infunp )
88 : indent( *this), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( *this ) {
89 //output << std::string( init );
90 }
91
92 CodeGenerator::CodeGenerator( std::ostream &os, char *init, int indentation, bool infunp )
93 : indent( *this ), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( *this ) {
94 //output << std::string( init );
95 }
96
97 string mangleName( DeclarationWithType *decl ) {
98 if ( decl->get_mangleName() != "" ) {
99 // need to incorporate scope level in order to differentiate names for destructors
100 return decl->get_scopedMangleName();
101 } else {
102 return decl->get_name();
103 } // if
104 }
105
106 void CodeGenerator::genAttributes( std::list< Attribute * > & attributes ) {
107 if ( ! attributes.empty() ) {
108 output << "__attribute__ ((";
109 for ( Attribute *& attr : attributes ) {
110 if ( ! attr->empty() ) {
111 output << attr->get_name() << "(";
112 genCommaList( attr->get_parameters().begin(), attr->get_parameters().end() );
113 output << ")";
114 }
115 output << ",";
116 }
117 output << ")) ";
118 }
119 }
120
121
122 //*** Declarations
123 void CodeGenerator::visit( FunctionDecl *functionDecl ) {
124 extension( functionDecl );
125 genAttributes( functionDecl->get_attributes() );
126
127 handleStorageClass( functionDecl );
128 if ( functionDecl->get_isInline() ) {
129 output << "inline ";
130 } // if
131 if ( functionDecl->get_isNoreturn() ) {
132 output << "_Noreturn ";
133 } // if
134 output << genType( functionDecl->get_functionType(), mangleName( functionDecl ) );
135
136 // how to get this to the Functype?
137 std::list< Declaration * > olds = functionDecl->get_oldDecls();
138 if ( ! olds.empty() ) {
139 output << " /* function has old declaration */";
140 } // if
141
142 // acceptAll( functionDecl->get_oldDecls(), *this );
143 if ( functionDecl->get_statements() ) {
144 functionDecl->get_statements()->accept( *this );
145 } // if
146 }
147
148 void CodeGenerator::visit( ObjectDecl *objectDecl ) {
149 extension( objectDecl );
150 handleStorageClass( objectDecl );
151 output << genType( objectDecl->get_type(), mangleName( objectDecl ) );
152
153 if ( objectDecl->get_init() ) {
154 output << " = ";
155 objectDecl->get_init()->accept( *this );
156 } // if
157 if ( objectDecl->get_bitfieldWidth() ) {
158 output << ":";
159 objectDecl->get_bitfieldWidth()->accept( *this );
160 } // if
161 }
162
163 void CodeGenerator::handleAggregate( AggregateDecl *aggDecl ) {
164 if ( aggDecl->get_name() != "" )
165 output << aggDecl->get_name();
166
167 std::list< Declaration * > &memb = aggDecl->get_members();
168
169 if ( ! memb.empty() ) {
170 output << " {" << endl;
171
172 cur_indent += CodeGenerator::tabsize;
173 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
174 output << indent;
175 (*i)->accept( *this );
176 output << ";" << endl;
177 }
178
179 cur_indent -= CodeGenerator::tabsize;
180
181 output << indent << "}";
182 } // if
183 }
184
185 void CodeGenerator::visit( StructDecl *structDecl ) {
186 extension( structDecl );
187 output << "struct ";
188 handleAggregate( structDecl );
189 }
190
191 void CodeGenerator::visit( UnionDecl *unionDecl ) {
192 extension( unionDecl );
193 output << "union ";
194 handleAggregate( unionDecl );
195 }
196
197 void CodeGenerator::visit( EnumDecl *enumDecl ) {
198 extension( enumDecl );
199 output << "enum ";
200
201 if ( enumDecl->get_name() != "" )
202 output << enumDecl->get_name();
203
204 std::list< Declaration* > &memb = enumDecl->get_members();
205
206 if ( ! memb.empty() ) {
207 output << " {" << endl;
208
209 cur_indent += CodeGenerator::tabsize;
210 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
211 ObjectDecl *obj = dynamic_cast< ObjectDecl* >( *i );
212 assert( obj );
213 output << indent << mangleName( obj );
214 if ( obj->get_init() ) {
215 output << " = ";
216 obj->get_init()->accept( *this );
217 } // if
218 output << "," << endl;
219 } // for
220
221 cur_indent -= CodeGenerator::tabsize;
222
223 output << indent << "}";
224 } // if
225 }
226
227 void CodeGenerator::visit( TraitDecl *traitDecl ) {}
228
229 void CodeGenerator::visit( TypedefDecl *typeDecl ) {
230 assert( false && "Typedefs are removed and substituted in earlier passes." );
231 //output << "typedef ";
232 //output << genType( typeDecl->get_base(), typeDecl->get_name() );
233 }
234
235 void CodeGenerator::visit( TypeDecl *typeDecl ) {
236 // really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
237 // still to be done
238 extension( typeDecl );
239 output << "extern unsigned long " << typeDecl->get_name();
240 if ( typeDecl->get_base() ) {
241 output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )";
242 } // if
243 }
244
245 void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
246 typedef std::list< Expression * > DesignatorList;
247 if ( designators.size() == 0 ) return;
248 for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
249 if ( dynamic_cast< NameExpr * >( *iter ) ) {
250 // if expression is a name, then initializing aggregate member
251 output << ".";
252 (*iter)->accept( *this );
253 } else {
254 // if not a simple name, it has to be a constant expression, i.e. an array designator
255 output << "[";
256 (*iter)->accept( *this );
257 output << "]";
258 }
259 }
260 output << " = ";
261 }
262
263 void CodeGenerator::visit( SingleInit *init ) {
264 printDesignators( init->get_designators() );
265 init->get_value()->accept( *this );
266 }
267
268 void CodeGenerator::visit( ListInit *init ) {
269 printDesignators( init->get_designators() );
270 output << "{ ";
271 if ( init->begin_initializers() == init->end_initializers() ) {
272 // illegal to leave initializer list empty for scalar initializers, but always legal to have 0
273 output << "0";
274 } else {
275 genCommaList( init->begin_initializers(), init->end_initializers() );
276 }
277 output << " }";
278 }
279
280 void CodeGenerator::visit( Constant *constant ) {
281 output << constant->get_value() ;
282 }
283
284 //*** Expressions
285 void CodeGenerator::visit( ApplicationExpr *applicationExpr ) {
286 extension( applicationExpr );
287 if ( VariableExpr *varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
288 OperatorInfo opInfo;
289 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
290 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
291 switch ( opInfo.type ) {
292 case OT_PREFIXASSIGN:
293 case OT_POSTFIXASSIGN:
294 case OT_INFIXASSIGN:
295 case OT_CTOR:
296 case OT_DTOR:
297 {
298 assert( arg != applicationExpr->get_args().end() );
299 if ( AddressExpr *addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) {
300 // remove & from first assignment/ctor argument
301 *arg = addrExpr->get_arg();
302 } else {
303 // no address-of operator, so must be a pointer - add dereference
304 UntypedExpr *newExpr = new UntypedExpr( new NameExpr( "*?" ) );
305 newExpr->get_args().push_back( *arg );
306 assert( (*arg)->get_results().size() == 1 );
307 Type * type = InitTweak::getPointerBase( (*arg)->get_results().front() );
308 assert( type );
309 newExpr->get_results().push_back( type );
310 *arg = newExpr;
311 } // if
312 break;
313 }
314
315 default:
316 // do nothing
317 ;
318 }
319
320 switch ( opInfo.type ) {
321 case OT_INDEX:
322 assert( applicationExpr->get_args().size() == 2 );
323 (*arg++)->accept( *this );
324 output << "[";
325 (*arg)->accept( *this );
326 output << "]";
327 break;
328
329 case OT_CALL:
330 // there are no intrinsic definitions of the function call operator
331 assert( false );
332 break;
333
334 case OT_CTOR:
335 case OT_DTOR:
336 if ( applicationExpr->get_args().size() == 1 ) {
337 // the expression fed into a single parameter constructor or destructor may contain side
338 // effects, so must still output this expression
339 output << "(";
340 (*arg++)->accept( *this );
341 output << ") /* " << opInfo.inputName << " */";
342 } else if ( applicationExpr->get_args().size() == 2 ) {
343 // intrinsic two parameter constructors are essentially bitwise assignment
344 output << "(";
345 (*arg++)->accept( *this );
346 output << opInfo.symbol;
347 (*arg)->accept( *this );
348 output << ") /* " << opInfo.inputName << " */";
349 } else {
350 // no constructors with 0 or more than 2 parameters
351 assert( false );
352 }
353 break;
354
355 case OT_PREFIX:
356 case OT_PREFIXASSIGN:
357 assert( applicationExpr->get_args().size() == 1 );
358 output << "(";
359 output << opInfo.symbol;
360 (*arg)->accept( *this );
361 output << ")";
362 break;
363
364 case OT_POSTFIX:
365 case OT_POSTFIXASSIGN:
366 assert( applicationExpr->get_args().size() == 1 );
367 (*arg)->accept( *this );
368 output << opInfo.symbol;
369 break;
370
371
372 case OT_INFIX:
373 case OT_INFIXASSIGN:
374 assert( applicationExpr->get_args().size() == 2 );
375 output << "(";
376 (*arg++)->accept( *this );
377 output << opInfo.symbol;
378 (*arg)->accept( *this );
379 output << ")";
380 break;
381
382 case OT_CONSTANT:
383 case OT_LABELADDRESS:
384 // there are no intrinsic definitions of 0/1 or label addresses as functions
385 assert( false );
386 }
387 } else {
388 varExpr->accept( *this );
389 output << "(";
390 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
391 output << ")";
392 } // if
393 } else {
394 applicationExpr->get_function()->accept( *this );
395 output << "(";
396 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
397 output << ")";
398 } // if
399 }
400
401 void CodeGenerator::visit( UntypedExpr *untypedExpr ) {
402 extension( untypedExpr );
403 if ( NameExpr *nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
404 OperatorInfo opInfo;
405 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
406 std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
407 switch ( opInfo.type ) {
408 case OT_INDEX:
409 assert( untypedExpr->get_args().size() == 2 );
410 (*arg++)->accept( *this );
411 output << "[";
412 (*arg)->accept( *this );
413 output << "]";
414 break;
415
416 case OT_CALL:
417 assert( false );
418
419
420 case OT_CTOR:
421 case OT_DTOR:
422 if ( untypedExpr->get_args().size() == 1 ) {
423 // the expression fed into a single parameter constructor or destructor may contain side
424 // effects, so must still output this expression
425 output << "(";
426 (*arg++)->accept( *this );
427 output << ") /* " << opInfo.inputName << " */";
428 } else if ( untypedExpr->get_args().size() == 2 ) {
429 // intrinsic two parameter constructors are essentially bitwise assignment
430 output << "(";
431 (*arg++)->accept( *this );
432 output << opInfo.symbol;
433 (*arg)->accept( *this );
434 output << ") /* " << opInfo.inputName << " */";
435 } else {
436 // no constructors with 0 or more than 2 parameters
437 assert( false );
438 }
439 break;
440
441 case OT_PREFIX:
442 case OT_PREFIXASSIGN:
443 case OT_LABELADDRESS:
444 assert( untypedExpr->get_args().size() == 1 );
445 output << "(";
446 output << opInfo.symbol;
447 (*arg)->accept( *this );
448 output << ")";
449 break;
450
451 case OT_POSTFIX:
452 case OT_POSTFIXASSIGN:
453 assert( untypedExpr->get_args().size() == 1 );
454 (*arg)->accept( *this );
455 output << opInfo.symbol;
456 break;
457
458 case OT_INFIX:
459 case OT_INFIXASSIGN:
460 assert( untypedExpr->get_args().size() == 2 );
461 output << "(";
462 (*arg++)->accept( *this );
463 output << opInfo.symbol;
464 (*arg)->accept( *this );
465 output << ")";
466 break;
467
468 case OT_CONSTANT:
469 // there are no intrinsic definitions of 0 or 1 as functions
470 assert( false );
471 }
472 } else {
473 nameExpr->accept( *this );
474 output << "(";
475 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
476 output << ")";
477 } // if
478 } else {
479 untypedExpr->get_function()->accept( *this );
480 output << "(";
481 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
482 output << ")";
483 } // if
484 }
485
486 void CodeGenerator::visit( NameExpr *nameExpr ) {
487 extension( nameExpr );
488 OperatorInfo opInfo;
489 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
490 assert( opInfo.type == OT_CONSTANT );
491 output << opInfo.symbol;
492 } else {
493 output << nameExpr->get_name();
494 } // if
495 }
496
497 void CodeGenerator::visit( AddressExpr *addressExpr ) {
498 extension( addressExpr );
499 output << "(&";
500 // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
501 if ( VariableExpr *variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
502 output << mangleName( variableExpr->get_var() );
503 } else {
504 addressExpr->get_arg()->accept( *this );
505 } // if
506 output << ")";
507 }
508
509 void CodeGenerator::visit( CastExpr *castExpr ) {
510 extension( castExpr );
511 output << "(";
512 if ( castExpr->get_results().empty() ) {
513 output << "(void)" ;
514 } else if ( ! castExpr->get_results().front()->get_isLvalue() ) {
515 // at least one result type of cast, but not an lvalue
516 output << "(";
517 output << genType( castExpr->get_results().front(), "" );
518 output << ")";
519 } else {
520 // otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
521 // never an lvalue in C
522 }
523 castExpr->get_arg()->accept( *this );
524 output << ")";
525 }
526
527 void CodeGenerator::visit( UntypedMemberExpr *memberExpr ) {
528 assert( false );
529 }
530
531 void CodeGenerator::visit( MemberExpr *memberExpr ) {
532 extension( memberExpr );
533 memberExpr->get_aggregate()->accept( *this );
534 output << "." << mangleName( memberExpr->get_member() );
535 }
536
537 void CodeGenerator::visit( VariableExpr *variableExpr ) {
538 extension( variableExpr );
539 OperatorInfo opInfo;
540 if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
541 output << opInfo.symbol;
542 } else {
543 output << mangleName( variableExpr->get_var() );
544 } // if
545 }
546
547 void CodeGenerator::visit( ConstantExpr *constantExpr ) {
548 assert( constantExpr->get_constant() );
549 extension( constantExpr );
550 constantExpr->get_constant()->accept( *this );
551 }
552
553 void CodeGenerator::visit( SizeofExpr *sizeofExpr ) {
554 extension( sizeofExpr );
555 output << "sizeof(";
556 if ( sizeofExpr->get_isType() ) {
557 output << genType( sizeofExpr->get_type(), "" );
558 } else {
559 sizeofExpr->get_expr()->accept( *this );
560 } // if
561 output << ")";
562 }
563
564 void CodeGenerator::visit( AlignofExpr *alignofExpr ) {
565 // use GCC extension to avoid bumping std to C11
566 extension( alignofExpr );
567 output << "__alignof__(";
568 if ( alignofExpr->get_isType() ) {
569 output << genType( alignofExpr->get_type(), "" );
570 } else {
571 alignofExpr->get_expr()->accept( *this );
572 } // if
573 output << ")";
574 }
575
576 void CodeGenerator::visit( UntypedOffsetofExpr *offsetofExpr ) {
577 assert( false && "UntypedOffsetofExpr should not reach code generation." );
578 }
579
580 void CodeGenerator::visit( OffsetofExpr *offsetofExpr ) {
581 // use GCC builtin
582 output << "__builtin_offsetof(";
583 output << genType( offsetofExpr->get_type(), "" );
584 output << ", " << mangleName( offsetofExpr->get_member() );
585 output << ")";
586 }
587
588 void CodeGenerator::visit( OffsetPackExpr *offsetPackExpr ) {
589 assert( false && "OffsetPackExpr should not reach code generation." );
590 }
591
592 void CodeGenerator::visit( LogicalExpr *logicalExpr ) {
593 extension( logicalExpr );
594 output << "(";
595 logicalExpr->get_arg1()->accept( *this );
596 if ( logicalExpr->get_isAnd() ) {
597 output << " && ";
598 } else {
599 output << " || ";
600 } // if
601 logicalExpr->get_arg2()->accept( *this );
602 output << ")";
603 }
604
605 void CodeGenerator::visit( ConditionalExpr *conditionalExpr ) {
606 extension( conditionalExpr );
607 output << "(";
608 conditionalExpr->get_arg1()->accept( *this );
609 output << " ? ";
610 conditionalExpr->get_arg2()->accept( *this );
611 output << " : ";
612 conditionalExpr->get_arg3()->accept( *this );
613 output << ")";
614 }
615
616 void CodeGenerator::visit( CommaExpr *commaExpr ) {
617 extension( commaExpr );
618 output << "(";
619 commaExpr->get_arg1()->accept( *this );
620 output << " , ";
621 commaExpr->get_arg2()->accept( *this );
622 output << ")";
623 }
624
625 void CodeGenerator::visit( TupleExpr *tupleExpr ) {}
626
627 void CodeGenerator::visit( TypeExpr *typeExpr ) {}
628
629 void CodeGenerator::visit( AsmExpr *asmExpr ) {
630 if ( asmExpr->get_inout() ) {
631 output << "[ ";
632 asmExpr->get_inout()->accept( *this );
633 output << " ] ";
634 } // if
635 asmExpr->get_constraint()->accept( *this );
636 output << " ( ";
637 asmExpr->get_operand()->accept( *this );
638 output << " )";
639 }
640
641 //*** Statements
642 void CodeGenerator::visit( CompoundStmt *compoundStmt ) {
643 std::list<Statement*> ks = compoundStmt->get_kids();
644 output << "{" << endl;
645
646 cur_indent += CodeGenerator::tabsize;
647
648 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
649 output << indent << printLabels( (*i)->get_labels() );
650 (*i)->accept( *this );
651
652 output << endl;
653 if ( wantSpacing( *i ) ) {
654 output << endl;
655 }
656 }
657 cur_indent -= CodeGenerator::tabsize;
658
659 output << indent << "}";
660 }
661
662 void CodeGenerator::visit( ExprStmt *exprStmt ) {
663 assert( exprStmt );
664 // cast the top-level expression to void to reduce gcc warnings.
665 Expression * expr = new CastExpr( exprStmt->get_expr() );
666 expr->accept( *this );
667 output << ";";
668 }
669
670 void CodeGenerator::visit( AsmStmt *asmStmt ) {
671 output << "asm ";
672 if ( asmStmt->get_voltile() ) output << "volatile ";
673 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
674 output << "( ";
675 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
676 output << " : ";
677 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
678 output << " : ";
679 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
680 output << " : ";
681 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
682 if ( ! asmStmt->get_gotolabels().empty() ) {
683 output << " : ";
684 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
685 output << *begin++;
686 if ( begin == asmStmt->get_gotolabels().end() ) break;
687 output << ", ";
688 } // for
689 } // if
690 output << " );" ;
691 }
692
693 void CodeGenerator::visit( IfStmt *ifStmt ) {
694 output << "if ( ";
695 ifStmt->get_condition()->accept( *this );
696 output << " ) ";
697
698 ifStmt->get_thenPart()->accept( *this );
699
700 if ( ifStmt->get_elsePart() != 0) {
701 output << " else ";
702 ifStmt->get_elsePart()->accept( *this );
703 } // if
704 }
705
706 void CodeGenerator::visit( SwitchStmt *switchStmt ) {
707 output << "switch ( " ;
708 switchStmt->get_condition()->accept( *this );
709 output << " ) ";
710
711 output << "{" << std::endl;
712 cur_indent += CodeGenerator::tabsize;
713
714 acceptAll( switchStmt->get_branches(), *this );
715
716 cur_indent -= CodeGenerator::tabsize;
717
718 output << indent << "}";
719 }
720
721 void CodeGenerator::visit( CaseStmt *caseStmt ) {
722 output << indent;
723 if ( caseStmt->isDefault()) {
724 output << "default";
725 } else {
726 output << "case ";
727 caseStmt->get_condition()->accept( *this );
728 } // if
729 output << ":\n";
730
731 std::list<Statement *> sts = caseStmt->get_statements();
732
733 cur_indent += CodeGenerator::tabsize;
734 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
735 output << indent << printLabels( (*i)->get_labels() ) ;
736 (*i)->accept( *this );
737 output << endl;
738 }
739 cur_indent -= CodeGenerator::tabsize;
740 }
741
742 void CodeGenerator::visit( BranchStmt *branchStmt ) {
743 switch ( branchStmt->get_type()) {
744 case BranchStmt::Goto:
745 if ( ! branchStmt->get_target().empty() )
746 output << "goto " << branchStmt->get_target();
747 else {
748 if ( branchStmt->get_computedTarget() != 0 ) {
749 output << "goto *";
750 branchStmt->get_computedTarget()->accept( *this );
751 } // if
752 } // if
753 break;
754 case BranchStmt::Break:
755 output << "break";
756 break;
757 case BranchStmt::Continue:
758 output << "continue";
759 break;
760 }
761 output << ";";
762 }
763
764
765 void CodeGenerator::visit( ReturnStmt *returnStmt ) {
766 output << "return ";
767 maybeAccept( returnStmt->get_expr(), *this );
768 output << ";";
769 }
770
771 void CodeGenerator::visit( WhileStmt *whileStmt ) {
772 if ( whileStmt->get_isDoWhile() ) {
773 output << "do" ;
774 } else {
775 output << "while (" ;
776 whileStmt->get_condition()->accept( *this );
777 output << ")";
778 } // if
779 output << " ";
780
781 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
782 whileStmt->get_body()->accept( *this );
783
784 output << indent;
785
786 if ( whileStmt->get_isDoWhile() ) {
787 output << " while (" ;
788 whileStmt->get_condition()->accept( *this );
789 output << ");";
790 } // if
791 }
792
793 void CodeGenerator::visit( ForStmt *forStmt ) {
794 // initialization is always hoisted, so don't bother doing anything with that
795 output << "for (;";
796
797 if ( forStmt->get_condition() != 0 ) {
798 forStmt->get_condition()->accept( *this );
799 }
800 output << ";";
801
802 if ( forStmt->get_increment() != 0 ) {
803 // cast the top-level expression to void to reduce gcc warnings.
804 Expression * expr = new CastExpr( forStmt->get_increment() );
805 expr->accept( *this );
806 }
807 output << ") ";
808
809 if ( forStmt->get_body() != 0 ) {
810 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
811 forStmt->get_body()->accept( *this );
812 } // if
813 }
814
815 void CodeGenerator::visit( NullStmt *nullStmt ) {
816 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
817 output << "/* null statement */ ;";
818 }
819
820 void CodeGenerator::visit( DeclStmt *declStmt ) {
821 declStmt->get_decl()->accept( *this );
822
823 if ( doSemicolon( declStmt->get_decl() ) ) {
824 output << ";";
825 } // if
826 }
827
828 void CodeGenerator::handleStorageClass( Declaration *decl ) {
829 switch ( decl->get_storageClass() ) {
830 case DeclarationNode::Extern:
831 output << "extern ";
832 break;
833 case DeclarationNode::Static:
834 output << "static ";
835 break;
836 case DeclarationNode::Auto:
837 // silently drop storage class
838 break;
839 case DeclarationNode::Register:
840 output << "register ";
841 break;
842 case DeclarationNode::Inline:
843 output << "inline ";
844 break;
845 case DeclarationNode::Fortran:
846 output << "fortran ";
847 break;
848 case DeclarationNode::Noreturn:
849 output << "_Noreturn ";
850 break;
851 case DeclarationNode::Threadlocal:
852 output << "_Thread_local ";
853 break;
854 case DeclarationNode::NoStorageClass:
855 break;
856 } // switch
857 }
858} // namespace CodeGen
859
860// Local Variables: //
861// tab-width: 4 //
862// mode: c++ //
863// compile-command: "make install" //
864// End: //
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