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source: src/CodeGen/CodeGenerator.cc @ f326f99

ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsctordeferred_resndemanglerenumforall-pointer-decaygc_noraiijacob/cs343-translationjenkins-sandboxmemorynew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newwith_gc

Last change on this file since f326f99 was f326f99, checked in by Rob Schluntz <rschlunt@…>, 8 years ago
add integer suffix to mangled names so that shadowed variables are accessable (needed for destructors to work correctly)
Property mode set to `100644`
File size: 21.7 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 : Rob Schluntz
12	// Last Modified On : Mon Apr 11 15:30:52 2016
13	// Update Count : 255
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
29	#include "Common/utility.h"
30	#include "Common/UnimplementedError.h"
31
32	#include "CodeGenerator.h"
33	#include "OperatorTable.h"
34	#include "GenType.h"
35
36	using namespace std;
37
38	namespace CodeGen {
39	int CodeGenerator::tabsize = 4;
40
41	// the kinds of statements that would ideally be followed by whitespace
42	bool wantSpacing( Statement * stmt) {
43	return dynamic_cast< IfStmt * >( stmt ) \|\| dynamic_cast< CompoundStmt * >( stmt ) \|\|
44	dynamic_cast< WhileStmt * >( stmt ) \|\| dynamic_cast< ForStmt * > ( stmt ) \|\| dynamic_cast< SwitchStmt *>( stmt );
45	}
46
47	ostream & CodeGenerator::Indenter::operator()( ostream & output ) {
48	return output << string( cg.cur_indent, ' ' );
49	}
50
51	ostream & operator<<( ostream & output, CodeGenerator::Indenter &indent ) {
52	return indent( output );
53	}
54
55	CodeGenerator::CodeGenerator( std::ostream &os ) : indent( *this), cur_indent( 0 ), insideFunction( false ), output( os ) { }
56
57	CodeGenerator::CodeGenerator( std::ostream &os, std::string init, int indentation, bool infunp )
58	: indent( *this), cur_indent( indentation ), insideFunction( infunp ), output( os ) {
59	//output << std::string( init );
60	}
61
62	CodeGenerator::CodeGenerator( std::ostream &os, char *init, int indentation, bool infunp )
63	: indent( *this ), cur_indent( indentation ), insideFunction( infunp ), output( os ) {
64	//output << std::string( init );
65	}
66
67	string mangleName( DeclarationWithType *decl ) {
68	if ( decl->get_mangleName() != "" ) {
69	// need to incorporate scope level in order to differentiate names for destructors
70	return decl->get_scopedMangleName();
71	} else {
72	return decl->get_name();
73	} // if
74	}
75
76	//*** Declarations
77	void CodeGenerator::visit( FunctionDecl *functionDecl ) {
78	handleStorageClass( functionDecl );
79	if ( functionDecl->get_isInline() ) {
80	output << "inline ";
81	} // if
82	if ( functionDecl->get_isNoreturn() ) {
83	output << "_Noreturn ";
84	} // if
85	output << genType( functionDecl->get_functionType(), mangleName( functionDecl ) );
86
87	// how to get this to the Functype?
88	std::list< Declaration * > olds = functionDecl->get_oldDecls();
89	if ( ! olds.empty() ) {
90	output << " /* function has old declaration */";
91	} // if
92
93	// acceptAll( functionDecl->get_oldDecls(), *this );
94	if ( functionDecl->get_statements() ) {
95	functionDecl->get_statements()->accept( *this );
96	} // if
97	}
98
99	void CodeGenerator::visit( ObjectDecl *objectDecl ) {
100	handleStorageClass( objectDecl );
101	output << genType( objectDecl->get_type(), mangleName( objectDecl ) );
102
103	if ( objectDecl->get_init() ) {
104	output << " = ";
105	objectDecl->get_init()->accept( *this );
106	} // if
107	if ( objectDecl->get_bitfieldWidth() ) {
108	output << ":";
109	objectDecl->get_bitfieldWidth()->accept( *this );
110	} // if
111	}
112
113	void CodeGenerator::handleAggregate( AggregateDecl *aggDecl ) {
114	if ( aggDecl->get_name() != "" )
115	output << aggDecl->get_name();
116
117	std::list< Declaration * > &memb = aggDecl->get_members();
118
119	if ( ! memb.empty() ) {
120	output << " {" << endl;
121
122	cur_indent += CodeGenerator::tabsize;
123	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
124	output << indent;
125	(i)->accept( this );
126	output << ";" << endl;
127	}
128
129	cur_indent -= CodeGenerator::tabsize;
130
131	output << indent << "}";
132	} // if
133	}
134
135	void CodeGenerator::visit( StructDecl *structDecl ) {
136	output << "struct ";
137	handleAggregate( structDecl );
138	}
139
140	void CodeGenerator::visit( UnionDecl *aggregateDecl ) {
141	output << "union ";
142	handleAggregate( aggregateDecl );
143	}
144
145	void CodeGenerator::visit( EnumDecl *aggDecl ) {
146	output << "enum ";
147
148	if ( aggDecl->get_name() != "" )
149	output << aggDecl->get_name();
150
151	std::list< Declaration* > &memb = aggDecl->get_members();
152
153	if ( ! memb.empty() ) {
154	output << " {" << endl;
155
156	cur_indent += CodeGenerator::tabsize;
157	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
158	ObjectDecl obj = dynamic_cast< ObjectDecl >( *i );
159	assert( obj );
160	output << indent << mangleName( obj );
161	if ( obj->get_init() ) {
162	output << " = ";
163	obj->get_init()->accept( *this );
164	} // if
165	output << "," << endl;
166	} // for
167
168	cur_indent -= CodeGenerator::tabsize;
169
170	output << indent << "}";
171	} // if
172	}
173
174	void CodeGenerator::visit( TraitDecl *aggregateDecl ) {}
175
176	void CodeGenerator::visit( TypedefDecl *typeDecl ) {
177	output << "typedef ";
178	output << genType( typeDecl->get_base(), typeDecl->get_name() );
179	}
180
181	void CodeGenerator::visit( TypeDecl *typeDecl ) {
182	// really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
183	// still to be done
184	output << "extern unsigned long " << typeDecl->get_name();
185	if ( typeDecl->get_base() ) {
186	output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )";
187	} // if
188	}
189
190	void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
191	typedef std::list< Expression * > DesignatorList;
192	if ( designators.size() == 0 ) return;
193	for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
194	if ( dynamic_cast< NameExpr * >( *iter ) ) {
195	// if expression is a name, then initializing aggregate member
196	output << ".";
197	(iter)->accept( this );
198	} else {
199	// if not a simple name, it has to be a constant expression, i.e. an array designator
200	output << "[";
201	(iter)->accept( this );
202	output << "]";
203	}
204	}
205	output << " = ";
206	}
207
208	void CodeGenerator::visit( SingleInit *init ) {
209	printDesignators( init->get_designators() );
210	init->get_value()->accept( *this );
211	}
212
213	void CodeGenerator::visit( ListInit *init ) {
214	printDesignators( init->get_designators() );
215	output << "{ ";
216	if ( init->begin_initializers() == init->end_initializers() ) {
217	// illegal to leave initializer list empty for scalar initializers,
218	// but always legal to have 0
219	output << "0";
220	} else {
221	genCommaList( init->begin_initializers(), init->end_initializers() );
222	}
223	output << " }";
224	}
225
226	void CodeGenerator::visit( Constant *constant ) {
227	output << constant->get_value() ;
228	}
229
230	//*** Expressions
231	void CodeGenerator::visit( ApplicationExpr *applicationExpr ) {
232	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( applicationExpr->get_function() ) ) {
233	OperatorInfo opInfo;
234	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
235	std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
236	switch ( opInfo.type ) {
237	case OT_PREFIXASSIGN:
238	case OT_POSTFIXASSIGN:
239	case OT_INFIXASSIGN:
240	{
241	assert( arg != applicationExpr->get_args().end() );
242	if ( AddressExpr addrExpr = dynamic_cast< AddressExpr >( *arg ) ) {
243
244	*arg = addrExpr->get_arg();
245	} else {
246	UntypedExpr newExpr = new UntypedExpr( new NameExpr( "?" ) );
247	newExpr->get_args().push_back( *arg );
248	*arg = newExpr;
249	} // if
250	break;
251	}
252
253	default:
254	// do nothing
255	;
256	}
257
258	switch ( opInfo.type ) {
259	case OT_INDEX:
260	assert( applicationExpr->get_args().size() == 2 );
261	(arg++)->accept( this );
262	output << "[";
263	(arg)->accept( this );
264	output << "]";
265	break;
266
267	case OT_CALL:
268	// there are no intrinsic definitions of the function call operator or constructors or destructors
269	assert( false );
270	break;
271
272	case OT_CTOR:
273	// it's just an optimization to disallow this, so for now let it through
274	// since it makes autogenerating constructors a lot easier
275	varExpr->accept( *this );
276	output << "(";
277	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
278	output << ")";
279
280	// intrinsic constructors should never be called directly - they should be transformed back into Initializer nodes
281	// assert(false);
282	break;
283
284	case OT_DTOR:
285	// intrinsic destructors do nothing - don't generate any code
286	output << " /* " << dynamic_cast<VariableExpr>(applicationExpr->get_function())->get_var()->get_name() << " /";
287	break;
288
289	case OT_PREFIX:
290	case OT_PREFIXASSIGN:
291	assert( applicationExpr->get_args().size() == 1 );
292	output << "(";
293	output << opInfo.symbol;
294	(arg)->accept( this );
295	output << ")";
296	break;
297
298	case OT_POSTFIX:
299	case OT_POSTFIXASSIGN:
300	assert( applicationExpr->get_args().size() == 1 );
301	(arg)->accept( this );
302	output << opInfo.symbol;
303	break;
304
305
306	case OT_INFIX:
307	case OT_INFIXASSIGN:
308	assert( applicationExpr->get_args().size() == 2 );
309	output << "(";
310	(arg++)->accept( this );
311	output << opInfo.symbol;
312	(arg)->accept( this );
313	output << ")";
314	break;
315
316	case OT_CONSTANT:
317	case OT_LABELADDRESS:
318	// there are no intrinsic definitions of 0/1 or label addresses as functions
319	assert( false );
320	}
321	} else {
322	varExpr->accept( *this );
323	output << "(";
324	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
325	output << ")";
326	} // if
327	} else {
328	applicationExpr->get_function()->accept( *this );
329	output << "(";
330	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
331	output << ")";
332	} // if
333	}
334
335	void CodeGenerator::visit( UntypedExpr *untypedExpr ) {
336	if ( NameExpr nameExpr = dynamic_cast< NameExpr >( untypedExpr->get_function() ) ) {
337	OperatorInfo opInfo;
338	if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
339	std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
340	switch ( opInfo.type ) {
341	case OT_INDEX:
342	assert( untypedExpr->get_args().size() == 2 );
343	(arg++)->accept( this );
344	output << "[";
345	(arg)->accept( this );
346	output << "]";
347	break;
348
349	case OT_CALL:
350	assert( false );
351
352	case OT_CTOR:
353	case OT_DTOR:
354	// intrinsic constructors should never be called
355	// intrinsic destructors do nothing
356	break;
357
358	case OT_PREFIX:
359	case OT_PREFIXASSIGN:
360	case OT_LABELADDRESS:
361	assert( untypedExpr->get_args().size() == 1 );
362	output << "(";
363	output << opInfo.symbol;
364	(arg)->accept( this );
365	output << ")";
366	break;
367
368	case OT_POSTFIX:
369	case OT_POSTFIXASSIGN:
370	assert( untypedExpr->get_args().size() == 1 );
371	(arg)->accept( this );
372	output << opInfo.symbol;
373	break;
374
375	case OT_INFIX:
376	case OT_INFIXASSIGN:
377	assert( untypedExpr->get_args().size() == 2 );
378	output << "(";
379	(arg++)->accept( this );
380	output << opInfo.symbol;
381	(arg)->accept( this );
382	output << ")";
383	break;
384
385	case OT_CONSTANT:
386	// there are no intrinsic definitions of 0 or 1 as functions
387	assert( false );
388	}
389	} else {
390	nameExpr->accept( *this );
391	output << "(";
392	genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
393	output << ")";
394	} // if
395	} else {
396	untypedExpr->get_function()->accept( *this );
397	output << "(";
398	genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
399	output << ")";
400	} // if
401	}
402
403	void CodeGenerator::visit( NameExpr *nameExpr ) {
404	OperatorInfo opInfo;
405	if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
406	assert( opInfo.type == OT_CONSTANT );
407	output << opInfo.symbol;
408	} else {
409	output << nameExpr->get_name();
410	} // if
411	}
412
413	void CodeGenerator::visit( AddressExpr *addressExpr ) {
414	output << "(&";
415	// this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
416	if ( VariableExpr variableExpr = dynamic_cast< VariableExpr >( addressExpr->get_arg() ) ) {
417	output << mangleName( variableExpr->get_var() );
418	} else {
419	addressExpr->get_arg()->accept( *this );
420	} // if
421	output << ")";
422	}
423
424	void CodeGenerator::visit( CastExpr *castExpr ) {
425	output << "(";
426	if ( castExpr->get_results().empty() ) {
427	output << "(void)" ;
428	} else if ( ! castExpr->get_results().front()->get_isLvalue() ) {
429	// at least one result type of cast, but not an lvalue
430	output << "(";
431	output << genType( castExpr->get_results().front(), "" );
432	output << ")";
433	} else {
434	// otherwise, the cast is to an lvalue type, so the cast
435	// should be dropped, since the result of a cast is
436	// never an lvalue in C
437	}
438	castExpr->get_arg()->accept( *this );
439	output << ")";
440	}
441
442	void CodeGenerator::visit( UntypedMemberExpr *memberExpr ) {
443	assert( false );
444	}
445
446	void CodeGenerator::visit( MemberExpr *memberExpr ) {
447	memberExpr->get_aggregate()->accept( *this );
448	output << "." << mangleName( memberExpr->get_member() );
449	}
450
451	void CodeGenerator::visit( VariableExpr *variableExpr ) {
452	OperatorInfo opInfo;
453	if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
454	output << opInfo.symbol;
455	} else {
456	output << mangleName( variableExpr->get_var() );
457	} // if
458	}
459
460	void CodeGenerator::visit( ConstantExpr *constantExpr ) {
461	assert( constantExpr->get_constant() );
462	constantExpr->get_constant()->accept( *this );
463	}
464
465	void CodeGenerator::visit( SizeofExpr *sizeofExpr ) {
466	output << "sizeof(";
467	if ( sizeofExpr->get_isType() ) {
468	output << genType( sizeofExpr->get_type(), "" );
469	} else {
470	sizeofExpr->get_expr()->accept( *this );
471	} // if
472	output << ")";
473	}
474
475	void CodeGenerator::visit( AlignofExpr *alignofExpr ) {
476	// use GCC extension to avoid bumping std to C11
477	output << "__alignof__(";
478	if ( alignofExpr->get_isType() ) {
479	output << genType( alignofExpr->get_type(), "" );
480	} else {
481	alignofExpr->get_expr()->accept( *this );
482	} // if
483	output << ")";
484	}
485
486	void CodeGenerator::visit( UntypedOffsetofExpr *offsetofExpr ) {
487	assert( false );
488	}
489
490	void CodeGenerator::visit( OffsetofExpr *offsetofExpr ) {
491	// use GCC builtin
492	output << "__builtin_offsetof(";
493	output << genType( offsetofExpr->get_type(), "" );
494	output << ", " << mangleName( offsetofExpr->get_member() );
495	output << ")";
496	}
497
498	void CodeGenerator::visit( LogicalExpr *logicalExpr ) {
499	output << "(";
500	logicalExpr->get_arg1()->accept( *this );
501	if ( logicalExpr->get_isAnd() ) {
502	output << " && ";
503	} else {
504	output << " \|\| ";
505	} // if
506	logicalExpr->get_arg2()->accept( *this );
507	output << ")";
508	}
509
510	void CodeGenerator::visit( ConditionalExpr *conditionalExpr ) {
511	output << "(";
512	conditionalExpr->get_arg1()->accept( *this );
513	output << " ? ";
514	conditionalExpr->get_arg2()->accept( *this );
515	output << " : ";
516	conditionalExpr->get_arg3()->accept( *this );
517	output << ")";
518	}
519
520	void CodeGenerator::visit( CommaExpr *commaExpr ) {
521	output << "(";
522	commaExpr->get_arg1()->accept( *this );
523	output << " , ";
524	commaExpr->get_arg2()->accept( *this );
525	output << ")";
526	}
527
528	void CodeGenerator::visit( TupleExpr *tupleExpr ) {}
529
530	void CodeGenerator::visit( TypeExpr *typeExpr ) {}
531
532	void CodeGenerator::visit( AsmExpr *asmExpr ) {
533	if ( asmExpr->get_inout() ) {
534	output << "[ ";
535	asmExpr->get_inout()->accept( *this );
536	output << " ] ";
537	} // if
538	asmExpr->get_constraint()->accept( *this );
539	output << " ( ";
540	asmExpr->get_operand()->accept( *this );
541	output << " )";
542	}
543
544	//*** Statements
545	void CodeGenerator::visit( CompoundStmt *compoundStmt ) {
546	std::list<Statement*> ks = compoundStmt->get_kids();
547	output << "{" << endl;
548
549	cur_indent += CodeGenerator::tabsize;
550
551	for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
552	output << indent << printLabels( (*i)->get_labels() );
553	(i)->accept( this );
554
555	output << endl;
556	if ( wantSpacing( *i ) ) {
557	output << endl;
558	}
559	}
560	cur_indent -= CodeGenerator::tabsize;
561
562	output << indent << "}";
563	}
564
565	void CodeGenerator::visit( ExprStmt *exprStmt ) {
566	// I don't see why this check is necessary.
567	// If this starts to cause problems then put it back in,
568	// with an explanation
569	assert( exprStmt );
570
571	// if ( exprStmt != 0 ) {
572	exprStmt->get_expr()->accept( *this );
573	output << ";" ;
574	// } // if
575	}
576
577	void CodeGenerator::visit( AsmStmt *asmStmt ) {
578	output << "asm ";
579	if ( asmStmt->get_voltile() ) output << "volatile ";
580	if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
581	output << "( ";
582	if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
583	output << " : ";
584	genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
585	output << " : ";
586	genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
587	output << " : ";
588	genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
589	if ( ! asmStmt->get_gotolabels().empty() ) {
590	output << " : ";
591	for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
592	output << *begin++;
593	if ( begin == asmStmt->get_gotolabels().end() ) break;
594	output << ", ";
595	} // for
596	} // if
597	output << " );" ;
598	}
599
600	void CodeGenerator::visit( IfStmt *ifStmt ) {
601	output << "if ( ";
602	ifStmt->get_condition()->accept( *this );
603	output << " ) ";
604
605	ifStmt->get_thenPart()->accept( *this );
606
607	if ( ifStmt->get_elsePart() != 0) {
608	output << " else ";
609	ifStmt->get_elsePart()->accept( *this );
610	} // if
611	}
612
613	void CodeGenerator::visit( SwitchStmt *switchStmt ) {
614	output << "switch ( " ;
615	switchStmt->get_condition()->accept( *this );
616	output << " ) ";
617
618	output << "{" << std::endl;
619	cur_indent += CodeGenerator::tabsize;
620
621	acceptAll( switchStmt->get_branches(), *this );
622
623	cur_indent -= CodeGenerator::tabsize;
624
625	output << indent << "}";
626	}
627
628	void CodeGenerator::visit( CaseStmt *caseStmt ) {
629	output << indent;
630	if ( caseStmt->isDefault()) {
631	output << "default";
632	} else {
633	output << "case ";
634	caseStmt->get_condition()->accept( *this );
635	} // if
636	output << ":\n";
637
638	std::list<Statement *> sts = caseStmt->get_statements();
639
640	cur_indent += CodeGenerator::tabsize;
641	for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
642	output << indent << printLabels( (*i)->get_labels() ) ;
643	(i)->accept( this );
644	output << endl;
645	}
646	cur_indent -= CodeGenerator::tabsize;
647	}
648
649	void CodeGenerator::visit( BranchStmt *branchStmt ) {
650	switch ( branchStmt->get_type()) {
651	case BranchStmt::Goto:
652	if ( ! branchStmt->get_target().empty() )
653	output << "goto " << branchStmt->get_target();
654	else {
655	if ( branchStmt->get_computedTarget() != 0 ) {
656	output << "goto *";
657	branchStmt->get_computedTarget()->accept( *this );
658	} // if
659	} // if
660	break;
661	case BranchStmt::Break:
662	output << "break";
663	break;
664	case BranchStmt::Continue:
665	output << "continue";
666	break;
667	}
668	output << ";";
669	}
670
671
672	void CodeGenerator::visit( ReturnStmt *returnStmt ) {
673	output << "return ";
674
675	// xxx -- check for null expression;
676	if ( returnStmt->get_expr() ) {
677	returnStmt->get_expr()->accept( *this );
678	} // if
679	output << ";";
680	}
681
682	void CodeGenerator::visit( WhileStmt *whileStmt ) {
683	if ( whileStmt->get_isDoWhile() )
684	output << "do" ;
685	else {
686	output << "while (" ;
687	whileStmt->get_condition()->accept( *this );
688	output << ")";
689	} // if
690	output << " ";
691
692	output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
693	whileStmt->get_body()->accept( *this );
694
695	output << indent;
696
697	if ( whileStmt->get_isDoWhile() ) {
698	output << " while (" ;
699	whileStmt->get_condition()->accept( *this );
700	output << ");";
701	} // if
702	}
703
704	void CodeGenerator::visit( ForStmt *forStmt ) {
705	// initialization is always hoisted, so don't
706	// bother doing anything with that
707	output << "for (;";
708
709	if ( forStmt->get_condition() != 0 )
710	forStmt->get_condition()->accept( *this );
711	output << ";";
712
713	if ( forStmt->get_increment() != 0 )
714	forStmt->get_increment()->accept( *this );
715	output << ") ";
716
717	if ( forStmt->get_body() != 0 ) {
718	output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
719	forStmt->get_body()->accept( *this );
720	} // if
721	}
722
723	void CodeGenerator::visit( NullStmt *nullStmt ) {
724	//output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
725	output << "/* null statement */ ;";
726	}
727
728	void CodeGenerator::visit( DeclStmt *declStmt ) {
729	declStmt->get_decl()->accept( *this );
730
731	if ( doSemicolon( declStmt->get_decl() ) ) {
732	output << ";";
733	} // if
734	}
735
736	std::string CodeGenerator::printLabels( std::list< Label > &l ) {
737	std::string str( "" );
738	l.unique(); // assumes a sorted list. Why not use set?
739
740	for ( std::list< Label >::iterator i = l.begin(); i != l.end(); i++ )
741	str += *i + ": ";
742
743	return str;
744	}
745
746	void CodeGenerator::handleStorageClass( Declaration *decl ) {
747	switch ( decl->get_storageClass() ) {
748	case DeclarationNode::Extern:
749	output << "extern ";
750	break;
751	case DeclarationNode::Static:
752	output << "static ";
753	break;
754	case DeclarationNode::Auto:
755	// silently drop storage class
756	break;
757	case DeclarationNode::Register:
758	output << "register ";
759	break;
760	case DeclarationNode::Inline:
761	output << "inline ";
762	break;
763	case DeclarationNode::Fortran:
764	output << "fortran ";
765	break;
766	case DeclarationNode::Noreturn:
767	output << "_Noreturn ";
768	break;
769	case DeclarationNode::Threadlocal:
770	output << "_Thread_local ";
771	break;
772	case DeclarationNode::NoStorageClass:
773	break;
774	} // switch
775	}
776	} // namespace CodeGen
777
778	// Local Variables: //
779	// tab-width: 4 //
780	// mode: c++ //
781	// compile-command: "make install" //
782	// End: //

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