source: src/CodeGen/CodeGenerator.cc@ 0318c7a

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 0318c7a was 5d125e4, checked in by Peter A. Buhr <pabuhr@…>, 9 years ago

start code allowing structures to no fields
  • Property mode set to 100644
File size: 24.6 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 : Fri Jul 15 15:53:15 2016
13// Update Count : 306
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 if ( ! memb.empty() ) {
169// if ( aggDecl->has_body() ) {
170// std::list< Declaration * > &memb = aggDecl->get_members();
171 output << " {" << endl;
172
173 cur_indent += CodeGenerator::tabsize;
174 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
175 output << indent;
176 (*i)->accept( *this );
177 output << ";" << endl;
178 }
179
180 cur_indent -= CodeGenerator::tabsize;
181
182 output << indent << "}";
183 } // if
184 }
185
186 void CodeGenerator::visit( StructDecl *structDecl ) {
187 extension( structDecl );
188 output << "struct ";
189 handleAggregate( structDecl );
190 }
191
192 void CodeGenerator::visit( UnionDecl *unionDecl ) {
193 extension( unionDecl );
194 output << "union ";
195 handleAggregate( unionDecl );
196 }
197
198 void CodeGenerator::visit( EnumDecl *enumDecl ) {
199 extension( enumDecl );
200 output << "enum ";
201
202 if ( enumDecl->get_name() != "" )
203 output << enumDecl->get_name();
204
205 std::list< Declaration* > &memb = enumDecl->get_members();
206
207 if ( ! memb.empty() ) {
208 output << " {" << endl;
209
210 cur_indent += CodeGenerator::tabsize;
211 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
212 ObjectDecl *obj = dynamic_cast< ObjectDecl* >( *i );
213 assert( obj );
214 output << indent << mangleName( obj );
215 if ( obj->get_init() ) {
216 output << " = ";
217 obj->get_init()->accept( *this );
218 } // if
219 output << "," << endl;
220 } // for
221
222 cur_indent -= CodeGenerator::tabsize;
223
224 output << indent << "}";
225 } // if
226 }
227
228 void CodeGenerator::visit( TraitDecl *traitDecl ) {}
229
230 void CodeGenerator::visit( TypedefDecl *typeDecl ) {
231 assert( false && "Typedefs are removed and substituted in earlier passes." );
232 //output << "typedef ";
233 //output << genType( typeDecl->get_base(), typeDecl->get_name() );
234 }
235
236 void CodeGenerator::visit( TypeDecl *typeDecl ) {
237 // really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
238 // still to be done
239 extension( typeDecl );
240 output << "extern unsigned long " << typeDecl->get_name();
241 if ( typeDecl->get_base() ) {
242 output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )";
243 } // if
244 }
245
246 void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
247 typedef std::list< Expression * > DesignatorList;
248 if ( designators.size() == 0 ) return;
249 for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
250 if ( dynamic_cast< NameExpr * >( *iter ) ) {
251 // if expression is a name, then initializing aggregate member
252 output << ".";
253 (*iter)->accept( *this );
254 } else {
255 // if not a simple name, it has to be a constant expression, i.e. an array designator
256 output << "[";
257 (*iter)->accept( *this );
258 output << "]";
259 }
260 }
261 output << " = ";
262 }
263
264 void CodeGenerator::visit( SingleInit *init ) {
265 printDesignators( init->get_designators() );
266 init->get_value()->accept( *this );
267 }
268
269 void CodeGenerator::visit( ListInit *init ) {
270 printDesignators( init->get_designators() );
271 output << "{ ";
272 if ( init->begin_initializers() == init->end_initializers() ) {
273 // illegal to leave initializer list empty for scalar initializers, but always legal to have 0
274 output << "0";
275 } else {
276 genCommaList( init->begin_initializers(), init->end_initializers() );
277 }
278 output << " }";
279 }
280
281 void CodeGenerator::visit( Constant *constant ) {
282 output << constant->get_value() ;
283 }
284
285 //*** Expressions
286 void CodeGenerator::visit( ApplicationExpr *applicationExpr ) {
287 extension( applicationExpr );
288 if ( VariableExpr *varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
289 OperatorInfo opInfo;
290 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
291 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
292 switch ( opInfo.type ) {
293 case OT_PREFIXASSIGN:
294 case OT_POSTFIXASSIGN:
295 case OT_INFIXASSIGN:
296 case OT_CTOR:
297 case OT_DTOR:
298 {
299 assert( arg != applicationExpr->get_args().end() );
300 if ( AddressExpr *addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) {
301 // remove & from first assignment/ctor argument
302 *arg = addrExpr->get_arg();
303 } else {
304 // no address-of operator, so must be a pointer - add dereference
305 UntypedExpr *newExpr = new UntypedExpr( new NameExpr( "*?" ) );
306 newExpr->get_args().push_back( *arg );
307 assert( (*arg)->get_results().size() == 1 );
308 Type * type = InitTweak::getPointerBase( (*arg)->get_results().front() );
309 assert( type );
310 newExpr->get_results().push_back( type );
311 *arg = newExpr;
312 } // if
313 break;
314 }
315
316 default:
317 // do nothing
318 ;
319 }
320
321 switch ( opInfo.type ) {
322 case OT_INDEX:
323 assert( applicationExpr->get_args().size() == 2 );
324 (*arg++)->accept( *this );
325 output << "[";
326 (*arg)->accept( *this );
327 output << "]";
328 break;
329
330 case OT_CALL:
331 // there are no intrinsic definitions of the function call operator
332 assert( false );
333 break;
334
335 case OT_CTOR:
336 case OT_DTOR:
337 if ( applicationExpr->get_args().size() == 1 ) {
338 // the expression fed into a single parameter constructor or destructor may contain side
339 // effects, so must still output this expression
340 output << "(";
341 (*arg++)->accept( *this );
342 output << ") /* " << opInfo.inputName << " */";
343 } else if ( applicationExpr->get_args().size() == 2 ) {
344 // intrinsic two parameter constructors are essentially bitwise assignment
345 output << "(";
346 (*arg++)->accept( *this );
347 output << opInfo.symbol;
348 (*arg)->accept( *this );
349 output << ") /* " << opInfo.inputName << " */";
350 } else {
351 // no constructors with 0 or more than 2 parameters
352 assert( false );
353 }
354 break;
355
356 case OT_PREFIX:
357 case OT_PREFIXASSIGN:
358 assert( applicationExpr->get_args().size() == 1 );
359 output << "(";
360 output << opInfo.symbol;
361 (*arg)->accept( *this );
362 output << ")";
363 break;
364
365 case OT_POSTFIX:
366 case OT_POSTFIXASSIGN:
367 assert( applicationExpr->get_args().size() == 1 );
368 (*arg)->accept( *this );
369 output << opInfo.symbol;
370 break;
371
372
373 case OT_INFIX:
374 case OT_INFIXASSIGN:
375 assert( applicationExpr->get_args().size() == 2 );
376 output << "(";
377 (*arg++)->accept( *this );
378 output << opInfo.symbol;
379 (*arg)->accept( *this );
380 output << ")";
381 break;
382
383 case OT_CONSTANT:
384 case OT_LABELADDRESS:
385 // there are no intrinsic definitions of 0/1 or label addresses as functions
386 assert( false );
387 }
388 } else {
389 varExpr->accept( *this );
390 output << "(";
391 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
392 output << ")";
393 } // if
394 } else {
395 applicationExpr->get_function()->accept( *this );
396 output << "(";
397 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
398 output << ")";
399 } // if
400 }
401
402 void CodeGenerator::visit( UntypedExpr *untypedExpr ) {
403 extension( untypedExpr );
404 if ( NameExpr *nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
405 OperatorInfo opInfo;
406 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
407 std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
408 switch ( opInfo.type ) {
409 case OT_INDEX:
410 assert( untypedExpr->get_args().size() == 2 );
411 (*arg++)->accept( *this );
412 output << "[";
413 (*arg)->accept( *this );
414 output << "]";
415 break;
416
417 case OT_CALL:
418 assert( false );
419
420
421 case OT_CTOR:
422 case OT_DTOR:
423 if ( untypedExpr->get_args().size() == 1 ) {
424 // the expression fed into a single parameter constructor or destructor may contain side
425 // effects, so must still output this expression
426 output << "(";
427 (*arg++)->accept( *this );
428 output << ") /* " << opInfo.inputName << " */";
429 } else if ( untypedExpr->get_args().size() == 2 ) {
430 // intrinsic two parameter constructors are essentially bitwise assignment
431 output << "(";
432 (*arg++)->accept( *this );
433 output << opInfo.symbol;
434 (*arg)->accept( *this );
435 output << ") /* " << opInfo.inputName << " */";
436 } else {
437 // no constructors with 0 or more than 2 parameters
438 assert( false );
439 }
440 break;
441
442 case OT_PREFIX:
443 case OT_PREFIXASSIGN:
444 case OT_LABELADDRESS:
445 assert( untypedExpr->get_args().size() == 1 );
446 output << "(";
447 output << opInfo.symbol;
448 (*arg)->accept( *this );
449 output << ")";
450 break;
451
452 case OT_POSTFIX:
453 case OT_POSTFIXASSIGN:
454 assert( untypedExpr->get_args().size() == 1 );
455 (*arg)->accept( *this );
456 output << opInfo.symbol;
457 break;
458
459 case OT_INFIX:
460 case OT_INFIXASSIGN:
461 assert( untypedExpr->get_args().size() == 2 );
462 output << "(";
463 (*arg++)->accept( *this );
464 output << opInfo.symbol;
465 (*arg)->accept( *this );
466 output << ")";
467 break;
468
469 case OT_CONSTANT:
470 // there are no intrinsic definitions of 0 or 1 as functions
471 assert( false );
472 }
473 } else {
474 nameExpr->accept( *this );
475 output << "(";
476 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
477 output << ")";
478 } // if
479 } else {
480 untypedExpr->get_function()->accept( *this );
481 output << "(";
482 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
483 output << ")";
484 } // if
485 }
486
487 void CodeGenerator::visit( NameExpr *nameExpr ) {
488 extension( nameExpr );
489 OperatorInfo opInfo;
490 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
491 assert( opInfo.type == OT_CONSTANT );
492 output << opInfo.symbol;
493 } else {
494 output << nameExpr->get_name();
495 } // if
496 }
497
498 void CodeGenerator::visit( AddressExpr *addressExpr ) {
499 extension( addressExpr );
500 output << "(&";
501 // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
502 if ( VariableExpr *variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
503 output << mangleName( variableExpr->get_var() );
504 } else {
505 addressExpr->get_arg()->accept( *this );
506 } // if
507 output << ")";
508 }
509
510 void CodeGenerator::visit( CastExpr *castExpr ) {
511 extension( castExpr );
512 output << "(";
513 if ( castExpr->get_results().empty() ) {
514 output << "(void)" ;
515 } else if ( ! castExpr->get_results().front()->get_isLvalue() ) {
516 // at least one result type of cast, but not an lvalue
517 output << "(";
518 output << genType( castExpr->get_results().front(), "" );
519 output << ")";
520 } else {
521 // otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
522 // never an lvalue in C
523 }
524 castExpr->get_arg()->accept( *this );
525 output << ")";
526 }
527
528 void CodeGenerator::visit( UntypedMemberExpr *memberExpr ) {
529 assert( false );
530 }
531
532 void CodeGenerator::visit( MemberExpr *memberExpr ) {
533 extension( memberExpr );
534 memberExpr->get_aggregate()->accept( *this );
535 output << "." << mangleName( memberExpr->get_member() );
536 }
537
538 void CodeGenerator::visit( VariableExpr *variableExpr ) {
539 extension( variableExpr );
540 OperatorInfo opInfo;
541 if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
542 output << opInfo.symbol;
543 } else {
544 output << mangleName( variableExpr->get_var() );
545 } // if
546 }
547
548 void CodeGenerator::visit( ConstantExpr *constantExpr ) {
549 assert( constantExpr->get_constant() );
550 extension( constantExpr );
551 constantExpr->get_constant()->accept( *this );
552 }
553
554 void CodeGenerator::visit( SizeofExpr *sizeofExpr ) {
555 extension( sizeofExpr );
556 output << "sizeof(";
557 if ( sizeofExpr->get_isType() ) {
558 output << genType( sizeofExpr->get_type(), "" );
559 } else {
560 sizeofExpr->get_expr()->accept( *this );
561 } // if
562 output << ")";
563 }
564
565 void CodeGenerator::visit( AlignofExpr *alignofExpr ) {
566 // use GCC extension to avoid bumping std to C11
567 extension( alignofExpr );
568 output << "__alignof__(";
569 if ( alignofExpr->get_isType() ) {
570 output << genType( alignofExpr->get_type(), "" );
571 } else {
572 alignofExpr->get_expr()->accept( *this );
573 } // if
574 output << ")";
575 }
576
577 void CodeGenerator::visit( UntypedOffsetofExpr *offsetofExpr ) {
578 assert( false && "UntypedOffsetofExpr should not reach code generation." );
579 }
580
581 void CodeGenerator::visit( OffsetofExpr *offsetofExpr ) {
582 // use GCC builtin
583 output << "__builtin_offsetof(";
584 output << genType( offsetofExpr->get_type(), "" );
585 output << ", " << mangleName( offsetofExpr->get_member() );
586 output << ")";
587 }
588
589 void CodeGenerator::visit( OffsetPackExpr *offsetPackExpr ) {
590 assert( false && "OffsetPackExpr should not reach code generation." );
591 }
592
593 void CodeGenerator::visit( LogicalExpr *logicalExpr ) {
594 extension( logicalExpr );
595 output << "(";
596 logicalExpr->get_arg1()->accept( *this );
597 if ( logicalExpr->get_isAnd() ) {
598 output << " && ";
599 } else {
600 output << " || ";
601 } // if
602 logicalExpr->get_arg2()->accept( *this );
603 output << ")";
604 }
605
606 void CodeGenerator::visit( ConditionalExpr *conditionalExpr ) {
607 extension( conditionalExpr );
608 output << "(";
609 conditionalExpr->get_arg1()->accept( *this );
610 output << " ? ";
611 conditionalExpr->get_arg2()->accept( *this );
612 output << " : ";
613 conditionalExpr->get_arg3()->accept( *this );
614 output << ")";
615 }
616
617 void CodeGenerator::visit( CommaExpr *commaExpr ) {
618 extension( commaExpr );
619 output << "(";
620 commaExpr->get_arg1()->accept( *this );
621 output << " , ";
622 commaExpr->get_arg2()->accept( *this );
623 output << ")";
624 }
625
626 void CodeGenerator::visit( TupleExpr *tupleExpr ) {}
627
628 void CodeGenerator::visit( TypeExpr *typeExpr ) {}
629
630 void CodeGenerator::visit( AsmExpr *asmExpr ) {
631 if ( asmExpr->get_inout() ) {
632 output << "[ ";
633 asmExpr->get_inout()->accept( *this );
634 output << " ] ";
635 } // if
636 asmExpr->get_constraint()->accept( *this );
637 output << " ( ";
638 asmExpr->get_operand()->accept( *this );
639 output << " )";
640 }
641
642 //*** Statements
643 void CodeGenerator::visit( CompoundStmt *compoundStmt ) {
644 std::list<Statement*> ks = compoundStmt->get_kids();
645 output << "{" << endl;
646
647 cur_indent += CodeGenerator::tabsize;
648
649 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
650 output << indent << printLabels( (*i)->get_labels() );
651 (*i)->accept( *this );
652
653 output << endl;
654 if ( wantSpacing( *i ) ) {
655 output << endl;
656 }
657 }
658 cur_indent -= CodeGenerator::tabsize;
659
660 output << indent << "}";
661 }
662
663 void CodeGenerator::visit( ExprStmt *exprStmt ) {
664 assert( exprStmt );
665 // cast the top-level expression to void to reduce gcc warnings.
666 Expression * expr = new CastExpr( exprStmt->get_expr() );
667 expr->accept( *this );
668 output << ";";
669 }
670
671 void CodeGenerator::visit( AsmStmt *asmStmt ) {
672 output << "asm ";
673 if ( asmStmt->get_voltile() ) output << "volatile ";
674 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
675 output << "( ";
676 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
677 output << " : ";
678 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
679 output << " : ";
680 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
681 output << " : ";
682 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
683 if ( ! asmStmt->get_gotolabels().empty() ) {
684 output << " : ";
685 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
686 output << *begin++;
687 if ( begin == asmStmt->get_gotolabels().end() ) break;
688 output << ", ";
689 } // for
690 } // if
691 output << " );" ;
692 }
693
694 void CodeGenerator::visit( IfStmt *ifStmt ) {
695 output << "if ( ";
696 ifStmt->get_condition()->accept( *this );
697 output << " ) ";
698
699 ifStmt->get_thenPart()->accept( *this );
700
701 if ( ifStmt->get_elsePart() != 0) {
702 output << " else ";
703 ifStmt->get_elsePart()->accept( *this );
704 } // if
705 }
706
707 void CodeGenerator::visit( SwitchStmt *switchStmt ) {
708 output << "switch ( " ;
709 switchStmt->get_condition()->accept( *this );
710 output << " ) ";
711
712 output << "{" << std::endl;
713 cur_indent += CodeGenerator::tabsize;
714
715 acceptAll( switchStmt->get_branches(), *this );
716
717 cur_indent -= CodeGenerator::tabsize;
718
719 output << indent << "}";
720 }
721
722 void CodeGenerator::visit( CaseStmt *caseStmt ) {
723 output << indent;
724 if ( caseStmt->isDefault()) {
725 output << "default";
726 } else {
727 output << "case ";
728 caseStmt->get_condition()->accept( *this );
729 } // if
730 output << ":\n";
731
732 std::list<Statement *> sts = caseStmt->get_statements();
733
734 cur_indent += CodeGenerator::tabsize;
735 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
736 output << indent << printLabels( (*i)->get_labels() ) ;
737 (*i)->accept( *this );
738 output << endl;
739 }
740 cur_indent -= CodeGenerator::tabsize;
741 }
742
743 void CodeGenerator::visit( BranchStmt *branchStmt ) {
744 switch ( branchStmt->get_type()) {
745 case BranchStmt::Goto:
746 if ( ! branchStmt->get_target().empty() )
747 output << "goto " << branchStmt->get_target();
748 else {
749 if ( branchStmt->get_computedTarget() != 0 ) {
750 output << "goto *";
751 branchStmt->get_computedTarget()->accept( *this );
752 } // if
753 } // if
754 break;
755 case BranchStmt::Break:
756 output << "break";
757 break;
758 case BranchStmt::Continue:
759 output << "continue";
760 break;
761 }
762 output << ";";
763 }
764
765
766 void CodeGenerator::visit( ReturnStmt *returnStmt ) {
767 output << "return ";
768 maybeAccept( returnStmt->get_expr(), *this );
769 output << ";";
770 }
771
772 void CodeGenerator::visit( WhileStmt *whileStmt ) {
773 if ( whileStmt->get_isDoWhile() ) {
774 output << "do" ;
775 } else {
776 output << "while (" ;
777 whileStmt->get_condition()->accept( *this );
778 output << ")";
779 } // if
780 output << " ";
781
782 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
783 whileStmt->get_body()->accept( *this );
784
785 output << indent;
786
787 if ( whileStmt->get_isDoWhile() ) {
788 output << " while (" ;
789 whileStmt->get_condition()->accept( *this );
790 output << ");";
791 } // if
792 }
793
794 void CodeGenerator::visit( ForStmt *forStmt ) {
795 // initialization is always hoisted, so don't bother doing anything with that
796 output << "for (;";
797
798 if ( forStmt->get_condition() != 0 ) {
799 forStmt->get_condition()->accept( *this );
800 }
801 output << ";";
802
803 if ( forStmt->get_increment() != 0 ) {
804 // cast the top-level expression to void to reduce gcc warnings.
805 Expression * expr = new CastExpr( forStmt->get_increment() );
806 expr->accept( *this );
807 }
808 output << ") ";
809
810 if ( forStmt->get_body() != 0 ) {
811 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
812 forStmt->get_body()->accept( *this );
813 } // if
814 }
815
816 void CodeGenerator::visit( NullStmt *nullStmt ) {
817 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
818 output << "/* null statement */ ;";
819 }
820
821 void CodeGenerator::visit( DeclStmt *declStmt ) {
822 declStmt->get_decl()->accept( *this );
823
824 if ( doSemicolon( declStmt->get_decl() ) ) {
825 output << ";";
826 } // if
827 }
828
829 void CodeGenerator::handleStorageClass( Declaration *decl ) {
830 switch ( decl->get_storageClass() ) {
831 case DeclarationNode::Extern:
832 output << "extern ";
833 break;
834 case DeclarationNode::Static:
835 output << "static ";
836 break;
837 case DeclarationNode::Auto:
838 // silently drop storage class
839 break;
840 case DeclarationNode::Register:
841 output << "register ";
842 break;
843 case DeclarationNode::Inline:
844 output << "inline ";
845 break;
846 case DeclarationNode::Fortran:
847 output << "fortran ";
848 break;
849 case DeclarationNode::Noreturn:
850 output << "_Noreturn ";
851 break;
852 case DeclarationNode::Threadlocal:
853 output << "_Thread_local ";
854 break;
855 case DeclarationNode::NoStorageClass:
856 break;
857 } // switch
858 }
859} // namespace CodeGen
860
861// Local Variables: //
862// tab-width: 4 //
863// mode: c++ //
864// compile-command: "make install" //
865// End: //
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