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source: src/CodeGen/CodeGenerator.cc @ a2a8d2a6

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

Last change on this file since a2a8d2a6 was 486341f, checked in by Rob Schluntz <rschlunt@…>, 8 years ago
add option to CodeGen? to output unmangled name, add ctorWarnings test
Property mode set to `100644`
File size: 25.4 KB

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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 : Thu Aug 4 13:35:30 2016
13	// Update Count : 352
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
39	using namespace std;
40
41	namespace 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	} // for
82	return output;
83	}
84
85	CodeGenerator::CodeGenerator( std::ostream & os, bool mangle ) : indent( this), cur_indent( 0 ), insideFunction( false ), output( os ), printLabels( this ), mangle( mangle ) {}
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 CodeGenerator::mangleName( DeclarationWithType * decl ) {
98	if ( ! mangle ) return decl->get_name();
99	if ( decl->get_mangleName() != "" ) {
100	// need to incorporate scope level in order to differentiate names for destructors
101	return decl->get_scopedMangleName();
102	} else {
103	return decl->get_name();
104	} // if
105	}
106
107	void CodeGenerator::genAttributes( std::list< Attribute * > & attributes ) {
108	if ( ! attributes.empty() ) {
109	output << "__attribute__ ((";
110	for ( Attribute *& attr : attributes ) {
111	if ( ! attr->empty() ) {
112	output << attr->get_name() << "(";
113	genCommaList( attr->get_parameters().begin(), attr->get_parameters().end() );
114	output << ")";
115	} // if
116	output << ",";
117	} // for
118	output << ")) ";
119	} // if
120	}
121
122
123	//*** Declarations
124	void CodeGenerator::visit( FunctionDecl * functionDecl ) {
125	extension( functionDecl );
126	genAttributes( functionDecl->get_attributes() );
127
128	handleStorageClass( functionDecl );
129	if ( functionDecl->get_isInline() ) {
130	output << "inline ";
131	} // if
132	if ( functionDecl->get_isNoreturn() ) {
133	output << "_Noreturn ";
134	} // if
135	output << genType( functionDecl->get_functionType(), mangleName( functionDecl ) );
136
137	// how to get this to the Functype?
138	std::list< Declaration * > olds = functionDecl->get_oldDecls();
139	if ( ! olds.empty() ) {
140	output << " /* function has old declaration */";
141	} // if
142
143	// acceptAll( functionDecl->get_oldDecls(), *this );
144	if ( functionDecl->get_statements() ) {
145	functionDecl->get_statements()->accept( *this );
146	} // if
147	}
148
149	void CodeGenerator::visit( ObjectDecl * objectDecl ) {
150	extension( objectDecl );
151	genAttributes( objectDecl->get_attributes() );
152
153	handleStorageClass( objectDecl );
154	output << genType( objectDecl->get_type(), mangleName( objectDecl ) );
155
156	if ( objectDecl->get_init() ) {
157	output << " = ";
158	objectDecl->get_init()->accept( *this );
159	} // if
160
161	if ( objectDecl->get_bitfieldWidth() ) {
162	output << ":";
163	objectDecl->get_bitfieldWidth()->accept( *this );
164	} // if
165	}
166
167	void CodeGenerator::handleAggregate( AggregateDecl * aggDecl ) {
168	if ( aggDecl->get_name() != "" )
169	output << aggDecl->get_name();
170
171	std::list< Declaration * > & memb = aggDecl->get_members();
172	if ( ! memb.empty() ) {
173	// if ( aggDecl->has_body() ) {
174	// std::list< Declaration * > & memb = aggDecl->get_members();
175	output << " {" << endl;
176
177	cur_indent += CodeGenerator::tabsize;
178	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
179	output << indent;
180	(i)->accept( this );
181	output << ";" << endl;
182	} // for
183
184	cur_indent -= CodeGenerator::tabsize;
185
186	output << indent << "}";
187	} // if
188	}
189
190	void CodeGenerator::visit( StructDecl * structDecl ) {
191	extension( structDecl );
192	output << "struct ";
193	handleAggregate( structDecl );
194	}
195
196	void CodeGenerator::visit( UnionDecl * unionDecl ) {
197	extension( unionDecl );
198	output << "union ";
199	handleAggregate( unionDecl );
200	}
201
202	void CodeGenerator::visit( EnumDecl * enumDecl ) {
203	extension( enumDecl );
204	output << "enum ";
205
206	if ( enumDecl->get_name() != "" )
207	output << enumDecl->get_name();
208
209	std::list< Declaration* > &memb = enumDecl->get_members();
210
211	if ( ! memb.empty() ) {
212	output << " {" << endl;
213
214	cur_indent += CodeGenerator::tabsize;
215	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
216	ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
217	assert( obj );
218	output << indent << mangleName( obj );
219	if ( obj->get_init() ) {
220	output << " = ";
221	obj->get_init()->accept( *this );
222	} // if
223	output << "," << endl;
224	} // for
225
226	cur_indent -= CodeGenerator::tabsize;
227
228	output << indent << "}";
229	} // if
230	}
231
232	void CodeGenerator::visit( TraitDecl * traitDecl ) {}
233
234	void CodeGenerator::visit( TypedefDecl * typeDecl ) {
235	assert( false && "Typedefs are removed and substituted in earlier passes." );
236	//output << "typedef ";
237	//output << genType( typeDecl->get_base(), typeDecl->get_name() );
238	}
239
240	void CodeGenerator::visit( TypeDecl * typeDecl ) {
241	// really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
242	// still to be done
243	extension( typeDecl );
244	output << "extern unsigned long " << typeDecl->get_name();
245	if ( typeDecl->get_base() ) {
246	output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )";
247	} // if
248	}
249
250	void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
251	typedef std::list< Expression * > DesignatorList;
252	if ( designators.size() == 0 ) return;
253	for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
254	if ( dynamic_cast< NameExpr * >( *iter ) ) {
255	// if expression is a name, then initializing aggregate member
256	output << ".";
257	(iter)->accept( this );
258	} else {
259	// if not a simple name, it has to be a constant expression, i.e. an array designator
260	output << "[";
261	(iter)->accept( this );
262	output << "]";
263	} // if
264	} // for
265	output << " = ";
266	}
267
268	void CodeGenerator::visit( SingleInit * init ) {
269	printDesignators( init->get_designators() );
270	init->get_value()->accept( *this );
271	}
272
273	void CodeGenerator::visit( ListInit * init ) {
274	printDesignators( init->get_designators() );
275	output << "{ ";
276	if ( init->begin() == init->end() ) {
277	// illegal to leave initializer list empty for scalar initializers, but always legal to have 0
278	output << "0";
279	} else {
280	genCommaList( init->begin(), init->end() );
281	} // if
282	output << " }";
283	}
284
285	void CodeGenerator::visit( Constant * constant ) {
286	output << constant->get_value() ;
287	}
288
289	//*** Expressions
290	void CodeGenerator::visit( ApplicationExpr * applicationExpr ) {
291	extension( applicationExpr );
292	if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
293	OperatorInfo opInfo;
294	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
295	std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
296	switch ( opInfo.type ) {
297	case OT_PREFIXASSIGN:
298	case OT_POSTFIXASSIGN:
299	case OT_INFIXASSIGN:
300	case OT_CTOR:
301	case OT_DTOR:
302	{
303	assert( arg != applicationExpr->get_args().end() );
304	if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) {
305	// remove & from first assignment/ctor argument
306	*arg = addrExpr->get_arg();
307	} else {
308	// no address-of operator, so must be a pointer - add dereference
309	UntypedExpr * newExpr = new UntypedExpr( new NameExpr( "*?" ) );
310	newExpr->get_args().push_back( *arg );
311	assert( (*arg)->get_results().size() == 1 );
312	Type * type = InitTweak::getPointerBase( (*arg)->get_results().front() );
313	assert( type );
314	newExpr->get_results().push_back( type->clone() );
315	*arg = newExpr;
316	} // if
317	break;
318	}
319
320	default:
321	// do nothing
322	;
323	} // switch
324
325	switch ( opInfo.type ) {
326	case OT_INDEX:
327	assert( applicationExpr->get_args().size() == 2 );
328	(arg++)->accept( this );
329	output << "[";
330	(arg)->accept( this );
331	output << "]";
332	break;
333
334	case OT_CALL:
335	// there are no intrinsic definitions of the function call operator
336	assert( false );
337	break;
338
339	case OT_CTOR:
340	case OT_DTOR:
341	if ( applicationExpr->get_args().size() == 1 ) {
342	// the expression fed into a single parameter constructor or destructor may contain side
343	// effects, so must still output this expression
344	output << "(";
345	(arg++)->accept( this );
346	output << ") /* " << opInfo.inputName << " */";
347	} else if ( applicationExpr->get_args().size() == 2 ) {
348	// intrinsic two parameter constructors are essentially bitwise assignment
349	output << "(";
350	(arg++)->accept( this );
351	output << opInfo.symbol;
352	(arg)->accept( this );
353	output << ") /* " << opInfo.inputName << " */";
354	} else {
355	// no constructors with 0 or more than 2 parameters
356	assert( false );
357	} // if
358	break;
359
360	case OT_PREFIX:
361	case OT_PREFIXASSIGN:
362	assert( applicationExpr->get_args().size() == 1 );
363	output << "(";
364	output << opInfo.symbol;
365	(arg)->accept( this );
366	output << ")";
367	break;
368
369	case OT_POSTFIX:
370	case OT_POSTFIXASSIGN:
371	assert( applicationExpr->get_args().size() == 1 );
372	(arg)->accept( this );
373	output << opInfo.symbol;
374	break;
375
376
377	case OT_INFIX:
378	case OT_INFIXASSIGN:
379	assert( applicationExpr->get_args().size() == 2 );
380	output << "(";
381	(arg++)->accept( this );
382	output << opInfo.symbol;
383	(arg)->accept( this );
384	output << ")";
385	break;
386
387	case OT_CONSTANT:
388	case OT_LABELADDRESS:
389	// there are no intrinsic definitions of 0/1 or label addresses as functions
390	assert( false );
391	} // switch
392	} else {
393	varExpr->accept( *this );
394	output << "(";
395	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
396	output << ")";
397	} // if
398	} else {
399	applicationExpr->get_function()->accept( *this );
400	output << "(";
401	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
402	output << ")";
403	} // if
404	}
405
406	void CodeGenerator::visit( UntypedExpr * untypedExpr ) {
407	extension( untypedExpr );
408	if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
409	OperatorInfo opInfo;
410	if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
411	std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
412	switch ( opInfo.type ) {
413	case OT_INDEX:
414	assert( untypedExpr->get_args().size() == 2 );
415	(arg++)->accept( this );
416	output << "[";
417	(arg)->accept( this );
418	output << "]";
419	break;
420
421	case OT_CALL:
422	assert( false );
423
424	case OT_CTOR:
425	case OT_DTOR:
426	if ( untypedExpr->get_args().size() == 1 ) {
427	// the expression fed into a single parameter constructor or destructor may contain side
428	// effects, so must still output this expression
429	output << "(";
430	(arg++)->accept( this );
431	output << ") /* " << opInfo.inputName << " */";
432	} else if ( untypedExpr->get_args().size() == 2 ) {
433	// intrinsic two parameter constructors are essentially bitwise assignment
434	output << "(";
435	(arg++)->accept( this );
436	output << opInfo.symbol;
437	(arg)->accept( this );
438	output << ") /* " << opInfo.inputName << " */";
439	} else {
440	// no constructors with 0 or more than 2 parameters
441	assert( false );
442	} // if
443	break;
444
445	case OT_PREFIX:
446	case OT_PREFIXASSIGN:
447	case OT_LABELADDRESS:
448	assert( untypedExpr->get_args().size() == 1 );
449	output << "(";
450	output << opInfo.symbol;
451	(arg)->accept( this );
452	output << ")";
453	break;
454
455	case OT_POSTFIX:
456	case OT_POSTFIXASSIGN:
457	assert( untypedExpr->get_args().size() == 1 );
458	(arg)->accept( this );
459	output << opInfo.symbol;
460	break;
461
462	case OT_INFIX:
463	case OT_INFIXASSIGN:
464	assert( untypedExpr->get_args().size() == 2 );
465	output << "(";
466	(arg++)->accept( this );
467	output << opInfo.symbol;
468	(arg)->accept( this );
469	output << ")";
470	break;
471
472	case OT_CONSTANT:
473	// there are no intrinsic definitions of 0 or 1 as functions
474	assert( false );
475	} // switch
476	} else {
477	if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
478	assert( untypedExpr->get_args().size() == 2 );
479	(untypedExpr->get_args().begin())->accept( this );
480	output << " ... ";
481	(--untypedExpr->get_args().end())->accept( this );
482	} else { // builtin routines
483	nameExpr->accept( *this );
484	output << "(";
485	genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
486	output << ")";
487	} // if
488	} // if
489	} else {
490	untypedExpr->get_function()->accept( *this );
491	output << "(";
492	genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
493	output << ")";
494	} // if
495	}
496
497	void CodeGenerator::visit( RangeExpr * rangeExpr ) {
498	rangeExpr->get_low()->accept( *this );
499	output << " ... ";
500	rangeExpr->get_high()->accept( *this );
501	}
502
503	void CodeGenerator::visit( NameExpr * nameExpr ) {
504	extension( nameExpr );
505	OperatorInfo opInfo;
506	if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
507	assert( opInfo.type == OT_CONSTANT );
508	output << opInfo.symbol;
509	} else {
510	output << nameExpr->get_name();
511	} // if
512	}
513
514	void CodeGenerator::visit( AddressExpr * addressExpr ) {
515	extension( addressExpr );
516	output << "(&";
517	// this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
518	if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
519	output << mangleName( variableExpr->get_var() );
520	} else {
521	addressExpr->get_arg()->accept( *this );
522	} // if
523	output << ")";
524	}
525
526	void CodeGenerator::visit( CastExpr * castExpr ) {
527	extension( castExpr );
528	output << "(";
529	if ( castExpr->get_results().empty() ) {
530	output << "(void)" ;
531	} else if ( ! castExpr->get_results().front()->get_isLvalue() ) {
532	// at least one result type of cast, but not an lvalue
533	output << "(";
534	output << genType( castExpr->get_results().front(), "" );
535	output << ")";
536	} else {
537	// otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
538	// never an lvalue in C
539	} // if
540	castExpr->get_arg()->accept( *this );
541	output << ")";
542	}
543
544	void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) {
545	assert( false );
546	}
547
548	void CodeGenerator::visit( MemberExpr * memberExpr ) {
549	extension( memberExpr );
550	memberExpr->get_aggregate()->accept( *this );
551	output << "." << mangleName( memberExpr->get_member() );
552	}
553
554	void CodeGenerator::visit( VariableExpr * variableExpr ) {
555	extension( variableExpr );
556	OperatorInfo opInfo;
557	if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
558	output << opInfo.symbol;
559	} else {
560	output << mangleName( variableExpr->get_var() );
561	} // if
562	}
563
564	void CodeGenerator::visit( ConstantExpr * constantExpr ) {
565	assert( constantExpr->get_constant() );
566	extension( constantExpr );
567	constantExpr->get_constant()->accept( *this );
568	}
569
570	void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
571	extension( sizeofExpr );
572	output << "sizeof(";
573	if ( sizeofExpr->get_isType() ) {
574	output << genType( sizeofExpr->get_type(), "" );
575	} else {
576	sizeofExpr->get_expr()->accept( *this );
577	} // if
578	output << ")";
579	}
580
581	void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
582	// use GCC extension to avoid bumping std to C11
583	extension( alignofExpr );
584	output << "__alignof__(";
585	if ( alignofExpr->get_isType() ) {
586	output << genType( alignofExpr->get_type(), "" );
587	} else {
588	alignofExpr->get_expr()->accept( *this );
589	} // if
590	output << ")";
591	}
592
593	void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
594	assert( false && "UntypedOffsetofExpr should not reach code generation." );
595	}
596
597	void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
598	// use GCC builtin
599	output << "__builtin_offsetof(";
600	output << genType( offsetofExpr->get_type(), "" );
601	output << ", " << mangleName( offsetofExpr->get_member() );
602	output << ")";
603	}
604
605	void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
606	assert( false && "OffsetPackExpr should not reach code generation." );
607	}
608
609	void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
610	extension( logicalExpr );
611	output << "(";
612	logicalExpr->get_arg1()->accept( *this );
613	if ( logicalExpr->get_isAnd() ) {
614	output << " && ";
615	} else {
616	output << " \|\| ";
617	} // if
618	logicalExpr->get_arg2()->accept( *this );
619	output << ")";
620	}
621
622	void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
623	extension( conditionalExpr );
624	output << "(";
625	conditionalExpr->get_arg1()->accept( *this );
626	output << " ? ";
627	conditionalExpr->get_arg2()->accept( *this );
628	output << " : ";
629	conditionalExpr->get_arg3()->accept( *this );
630	output << ")";
631	}
632
633	void CodeGenerator::visit( CommaExpr * commaExpr ) {
634	extension( commaExpr );
635	output << "(";
636	commaExpr->get_arg1()->accept( *this );
637	output << " , ";
638	commaExpr->get_arg2()->accept( *this );
639	output << ")";
640	}
641
642	void CodeGenerator::visit( TupleExpr * tupleExpr ) {}
643
644	void CodeGenerator::visit( TypeExpr * typeExpr ) {}
645
646	void CodeGenerator::visit( AsmExpr * asmExpr ) {
647	if ( asmExpr->get_inout() ) {
648	output << "[ ";
649	asmExpr->get_inout()->accept( *this );
650	output << " ] ";
651	} // if
652	asmExpr->get_constraint()->accept( *this );
653	output << " ( ";
654	asmExpr->get_operand()->accept( *this );
655	output << " )";
656	}
657
658	//*** Statements
659	void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
660	std::list<Statement*> ks = compoundStmt->get_kids();
661	output << "{" << endl;
662
663	cur_indent += CodeGenerator::tabsize;
664
665	for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
666	output << indent << printLabels( (*i)->get_labels() );
667	(i)->accept( this );
668
669	output << endl;
670	if ( wantSpacing( *i ) ) {
671	output << endl;
672	} // if
673	} // for
674	cur_indent -= CodeGenerator::tabsize;
675
676	output << indent << "}";
677	}
678
679	void CodeGenerator::visit( ExprStmt * exprStmt ) {
680	assert( exprStmt );
681	// cast the top-level expression to void to reduce gcc warnings.
682	Expression * expr = new CastExpr( exprStmt->get_expr() );
683	expr->accept( *this );
684	output << ";";
685	}
686
687	void CodeGenerator::visit( AsmStmt * asmStmt ) {
688	output << "asm ";
689	if ( asmStmt->get_voltile() ) output << "volatile ";
690	if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
691	output << "( ";
692	if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
693	output << " : ";
694	genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
695	output << " : ";
696	genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
697	output << " : ";
698	genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
699	if ( ! asmStmt->get_gotolabels().empty() ) {
700	output << " : ";
701	for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
702	output << *begin++;
703	if ( begin == asmStmt->get_gotolabels().end() ) break;
704	output << ", ";
705	} // for
706	} // if
707	output << " );" ;
708	}
709
710	void CodeGenerator::visit( IfStmt * ifStmt ) {
711	output << "if ( ";
712	ifStmt->get_condition()->accept( *this );
713	output << " ) ";
714
715	ifStmt->get_thenPart()->accept( *this );
716
717	if ( ifStmt->get_elsePart() != 0) {
718	output << " else ";
719	ifStmt->get_elsePart()->accept( *this );
720	} // if
721	}
722
723	void CodeGenerator::visit( SwitchStmt * switchStmt ) {
724	output << "switch ( " ;
725	switchStmt->get_condition()->accept( *this );
726	output << " ) ";
727
728	output << "{" << std::endl;
729	cur_indent += CodeGenerator::tabsize;
730	acceptAll( switchStmt->get_statements(), *this );
731	cur_indent -= CodeGenerator::tabsize;
732	output << indent << "}";
733	}
734
735	void CodeGenerator::visit( CaseStmt * caseStmt ) {
736	output << indent;
737	if ( caseStmt->isDefault()) {
738	output << "default";
739	} else {
740	output << "case ";
741	caseStmt->get_condition()->accept( *this );
742	} // if
743	output << ":\n";
744
745	std::list<Statement *> sts = caseStmt->get_statements();
746
747	cur_indent += CodeGenerator::tabsize;
748	for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
749	output << indent << printLabels( (*i)->get_labels() ) ;
750	(i)->accept( this );
751	output << endl;
752	} // for
753	cur_indent -= CodeGenerator::tabsize;
754	}
755
756	void CodeGenerator::visit( BranchStmt * branchStmt ) {
757	switch ( branchStmt->get_type()) {
758	case BranchStmt::Goto:
759	if ( ! branchStmt->get_target().empty() )
760	output << "goto " << branchStmt->get_target();
761	else {
762	if ( branchStmt->get_computedTarget() != 0 ) {
763	output << "goto *";
764	branchStmt->get_computedTarget()->accept( *this );
765	} // if
766	} // if
767	break;
768	case BranchStmt::Break:
769	output << "break";
770	break;
771	case BranchStmt::Continue:
772	output << "continue";
773	break;
774	} // switch
775	output << ";";
776	}
777
778
779	void CodeGenerator::visit( ReturnStmt * returnStmt ) {
780	output << "return ";
781	maybeAccept( returnStmt->get_expr(), *this );
782	output << ";";
783	}
784
785	void CodeGenerator::visit( WhileStmt * whileStmt ) {
786	if ( whileStmt->get_isDoWhile() ) {
787	output << "do" ;
788	} else {
789	output << "while (" ;
790	whileStmt->get_condition()->accept( *this );
791	output << ")";
792	} // if
793	output << " ";
794
795	output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
796	whileStmt->get_body()->accept( *this );
797
798	output << indent;
799
800	if ( whileStmt->get_isDoWhile() ) {
801	output << " while (" ;
802	whileStmt->get_condition()->accept( *this );
803	output << ");";
804	} // if
805	}
806
807	void CodeGenerator::visit( ForStmt * forStmt ) {
808	// initialization is always hoisted, so don't bother doing anything with that
809	output << "for (;";
810
811	if ( forStmt->get_condition() != 0 ) {
812	forStmt->get_condition()->accept( *this );
813	} // if
814	output << ";";
815
816	if ( forStmt->get_increment() != 0 ) {
817	// cast the top-level expression to void to reduce gcc warnings.
818	Expression * expr = new CastExpr( forStmt->get_increment() );
819	expr->accept( *this );
820	} // if
821	output << ") ";
822
823	if ( forStmt->get_body() != 0 ) {
824	output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
825	forStmt->get_body()->accept( *this );
826	} // if
827	}
828
829	void CodeGenerator::visit( NullStmt * nullStmt ) {
830	//output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
831	output << "/* null statement */ ;";
832	}
833
834	void CodeGenerator::visit( DeclStmt * declStmt ) {
835	declStmt->get_decl()->accept( *this );
836
837	if ( doSemicolon( declStmt->get_decl() ) ) {
838	output << ";";
839	} // if
840	}
841
842	void CodeGenerator::handleStorageClass( Declaration * decl ) {
843	switch ( decl->get_storageClass() ) {
844	case DeclarationNode::Extern:
845	output << "extern ";
846	break;
847	case DeclarationNode::Static:
848	output << "static ";
849	break;
850	case DeclarationNode::Auto:
851	// silently drop storage class
852	break;
853	case DeclarationNode::Register:
854	output << "register ";
855	break;
856	case DeclarationNode::Inline:
857	output << "inline ";
858	break;
859	case DeclarationNode::Fortran:
860	output << "fortran ";
861	break;
862	case DeclarationNode::Noreturn:
863	output << "_Noreturn ";
864	break;
865	case DeclarationNode::Threadlocal:
866	output << "_Thread_local ";
867	break;
868	case DeclarationNode::NoStorageClass:
869	break;
870	} // switch
871	}
872	} // namespace CodeGen
873
874	// Local Variables: //
875	// tab-width: 4 //
876	// mode: c++ //
877	// compile-command: "make install" //
878	// End: //

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