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CodeGenerator.cc @ 7b21d99

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 7b21d99 was 9e2c1f0, checked in by Rob Schluntz <rschlunt@…>, 9 years ago

Merge branch 'global-init' into ctor and add global destroy function to call destructors on global objects

Conflicts:

src/CodeGen/CodeGenerator.cc
src/InitTweak/module.mk
src/Makefile.in
src/SynTree/Declaration.h
src/SynTree/FunctionDecl.cc
src/main.cc

Property mode set to 100644

File size: 23.3 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 : Fri May 06 16:01:00 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	// generalize this
79	FunctionDecl::Attribute attr = functionDecl->get_attribute();
80	switch ( attr.type ) {
81	case FunctionDecl::Attribute::Constructor:
82	output << "__attribute__ ((constructor";
83	if ( attr.priority != FunctionDecl::Attribute::Default ) {
84	output << "(" << attr.priority << ")";
85	}
86	output << ")) ";
87	break;
88	case FunctionDecl::Attribute::Destructor:
89	output << "__attribute__ ((destructor";
90	if ( attr.priority != FunctionDecl::Attribute::Default ) {
91	output << "(" << attr.priority << ")";
92	}
93	output << ")) ";
94	break;
95	default:
96	break;
97	}
98	handleStorageClass( functionDecl );
99	if ( functionDecl->get_isInline() ) {
100	output << "inline ";
101	} // if
102	if ( functionDecl->get_isNoreturn() ) {
103	output << "_Noreturn ";
104	} // if
105	output << genType( functionDecl->get_functionType(), mangleName( functionDecl ) );
106
107	// how to get this to the Functype?
108	std::list< Declaration * > olds = functionDecl->get_oldDecls();
109	if ( ! olds.empty() ) {
110	output << " /* function has old declaration */";
111	} // if
112
113	// acceptAll( functionDecl->get_oldDecls(), *this );
114	if ( functionDecl->get_statements() ) {
115	functionDecl->get_statements()->accept( *this );
116	} // if
117	}
118
119	void CodeGenerator::visit( ObjectDecl *objectDecl ) {
120	handleStorageClass( objectDecl );
121	output << genType( objectDecl->get_type(), mangleName( objectDecl ) );
122
123	if ( objectDecl->get_init() ) {
124	output << " = ";
125	objectDecl->get_init()->accept( *this );
126	} // if
127	if ( objectDecl->get_bitfieldWidth() ) {
128	output << ":";
129	objectDecl->get_bitfieldWidth()->accept( *this );
130	} // if
131	}
132
133	void CodeGenerator::handleAggregate( AggregateDecl *aggDecl ) {
134	if ( aggDecl->get_name() != "" )
135	output << aggDecl->get_name();
136
137	std::list< Declaration * > &memb = aggDecl->get_members();
138
139	if ( ! memb.empty() ) {
140	output << " {" << endl;
141
142	cur_indent += CodeGenerator::tabsize;
143	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
144	output << indent;
145	(i)->accept( this );
146	output << ";" << endl;
147	}
148
149	cur_indent -= CodeGenerator::tabsize;
150
151	output << indent << "}";
152	} // if
153	}
154
155	void CodeGenerator::visit( StructDecl *structDecl ) {
156	output << "struct ";
157	handleAggregate( structDecl );
158	}
159
160	void CodeGenerator::visit( UnionDecl *aggregateDecl ) {
161	output << "union ";
162	handleAggregate( aggregateDecl );
163	}
164
165	void CodeGenerator::visit( EnumDecl *aggDecl ) {
166	output << "enum ";
167
168	if ( aggDecl->get_name() != "" )
169	output << aggDecl->get_name();
170
171	std::list< Declaration* > &memb = aggDecl->get_members();
172
173	if ( ! memb.empty() ) {
174	output << " {" << endl;
175
176	cur_indent += CodeGenerator::tabsize;
177	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
178	ObjectDecl obj = dynamic_cast< ObjectDecl >( *i );
179	assert( obj );
180	output << indent << mangleName( obj );
181	if ( obj->get_init() ) {
182	output << " = ";
183	obj->get_init()->accept( *this );
184	} // if
185	output << "," << endl;
186	} // for
187
188	cur_indent -= CodeGenerator::tabsize;
189
190	output << indent << "}";
191	} // if
192	}
193
194	void CodeGenerator::visit( TraitDecl *aggregateDecl ) {}
195
196	void CodeGenerator::visit( TypedefDecl *typeDecl ) {
197	output << "typedef ";
198	output << genType( typeDecl->get_base(), typeDecl->get_name() );
199	}
200
201	void CodeGenerator::visit( TypeDecl *typeDecl ) {
202	// really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
203	// still to be done
204	output << "extern unsigned long " << typeDecl->get_name();
205	if ( typeDecl->get_base() ) {
206	output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )";
207	} // if
208	}
209
210	void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
211	typedef std::list< Expression * > DesignatorList;
212	if ( designators.size() == 0 ) return;
213	for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
214	if ( dynamic_cast< NameExpr * >( *iter ) ) {
215	// if expression is a name, then initializing aggregate member
216	output << ".";
217	(iter)->accept( this );
218	} else {
219	// if not a simple name, it has to be a constant expression, i.e. an array designator
220	output << "[";
221	(iter)->accept( this );
222	output << "]";
223	}
224	}
225	output << " = ";
226	}
227
228	void CodeGenerator::visit( SingleInit *init ) {
229	printDesignators( init->get_designators() );
230	init->get_value()->accept( *this );
231	}
232
233	void CodeGenerator::visit( ListInit *init ) {
234	printDesignators( init->get_designators() );
235	output << "{ ";
236	if ( init->begin_initializers() == init->end_initializers() ) {
237	// illegal to leave initializer list empty for scalar initializers,
238	// but always legal to have 0
239	output << "0";
240	} else {
241	genCommaList( init->begin_initializers(), init->end_initializers() );
242	}
243	output << " }";
244	}
245
246	void CodeGenerator::visit( Constant *constant ) {
247	output << constant->get_value() ;
248	}
249
250	//*** Expressions
251	void CodeGenerator::visit( ApplicationExpr *applicationExpr ) {
252	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( applicationExpr->get_function() ) ) {
253	OperatorInfo opInfo;
254	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
255	std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
256	switch ( opInfo.type ) {
257	case OT_PREFIXASSIGN:
258	case OT_POSTFIXASSIGN:
259	case OT_INFIXASSIGN:
260	case OT_CTOR:
261	case OT_DTOR:
262	{
263	assert( arg != applicationExpr->get_args().end() );
264	if ( AddressExpr addrExpr = dynamic_cast< AddressExpr >( *arg ) ) {
265	// remove & from first assignment/ctor argument
266	*arg = addrExpr->get_arg();
267	} else {
268	// no address-of operator, so must be a pointer - add dereference
269	UntypedExpr newExpr = new UntypedExpr( new NameExpr( "?" ) );
270	newExpr->get_args().push_back( *arg );
271	*arg = newExpr;
272	} // if
273	break;
274	}
275
276	default:
277	// do nothing
278	;
279	}
280
281	switch ( opInfo.type ) {
282	case OT_INDEX:
283	assert( applicationExpr->get_args().size() == 2 );
284	(arg++)->accept( this );
285	output << "[";
286	(arg)->accept( this );
287	output << "]";
288	break;
289
290	case OT_CALL:
291	// there are no intrinsic definitions of the function call operator
292	assert( false );
293	break;
294
295	case OT_CTOR:
296	case OT_DTOR:
297	if ( applicationExpr->get_args().size() == 1 ) {
298	// the expression fed into a single parameter constructor or destructor
299	// may contain side effects - output as a void expression
300	output << "((void)(";
301	(arg++)->accept( this );
302	output << ")) /* " << opInfo.inputName << " */";
303	} else if ( applicationExpr->get_args().size() == 2 ) {
304	// intrinsic two parameter constructors are essentially bitwise assignment
305	output << "(";
306	(arg++)->accept( this );
307	output << opInfo.symbol;
308	(arg)->accept( this );
309	output << ") /* " << opInfo.inputName << " */";
310	} else {
311	// no constructors with 0 or more than 2 parameters
312	assert( false );
313	}
314	break;
315
316	case OT_PREFIX:
317	case OT_PREFIXASSIGN:
318	assert( applicationExpr->get_args().size() == 1 );
319	output << "(";
320	output << opInfo.symbol;
321	(arg)->accept( this );
322	output << ")";
323	break;
324
325	case OT_POSTFIX:
326	case OT_POSTFIXASSIGN:
327	assert( applicationExpr->get_args().size() == 1 );
328	(arg)->accept( this );
329	output << opInfo.symbol;
330	break;
331
332
333	case OT_INFIX:
334	case OT_INFIXASSIGN:
335	assert( applicationExpr->get_args().size() == 2 );
336	output << "(";
337	(arg++)->accept( this );
338	output << opInfo.symbol;
339	(arg)->accept( this );
340	output << ")";
341	break;
342
343	case OT_CONSTANT:
344	case OT_LABELADDRESS:
345	// there are no intrinsic definitions of 0/1 or label addresses as functions
346	assert( false );
347	}
348	} else {
349	varExpr->accept( *this );
350	output << "(";
351	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
352	output << ")";
353	} // if
354	} else {
355	applicationExpr->get_function()->accept( *this );
356	output << "(";
357	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
358	output << ")";
359	} // if
360	}
361
362	void CodeGenerator::visit( UntypedExpr *untypedExpr ) {
363	if ( NameExpr nameExpr = dynamic_cast< NameExpr >( untypedExpr->get_function() ) ) {
364	OperatorInfo opInfo;
365	if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
366	std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
367	switch ( opInfo.type ) {
368	case OT_INDEX:
369	assert( untypedExpr->get_args().size() == 2 );
370	(arg++)->accept( this );
371	output << "[";
372	(arg)->accept( this );
373	output << "]";
374	break;
375
376	case OT_CALL:
377	assert( false );
378
379
380	case OT_CTOR:
381	case OT_DTOR:
382	if ( untypedExpr->get_args().size() == 1 ) {
383	// the expression fed into a single parameter constructor or destructor
384	// may contain side effects - output as a void expression
385	output << "((void)(";
386	(arg++)->accept( this );
387	output << ")) /* " << opInfo.inputName << " */";
388	} else if ( untypedExpr->get_args().size() == 2 ) {
389	// intrinsic two parameter constructors are essentially bitwise assignment
390	output << "(";
391	(arg++)->accept( this );
392	output << opInfo.symbol;
393	(arg)->accept( this );
394	output << ") /* " << opInfo.inputName << " */";
395	} else {
396	// no constructors with 0 or more than 2 parameters
397	assert( false );
398	}
399	break;
400
401	case OT_PREFIX:
402	case OT_PREFIXASSIGN:
403	case OT_LABELADDRESS:
404	assert( untypedExpr->get_args().size() == 1 );
405	output << "(";
406	output << opInfo.symbol;
407	(arg)->accept( this );
408	output << ")";
409	break;
410
411	case OT_POSTFIX:
412	case OT_POSTFIXASSIGN:
413	assert( untypedExpr->get_args().size() == 1 );
414	(arg)->accept( this );
415	output << opInfo.symbol;
416	break;
417
418	case OT_INFIX:
419	case OT_INFIXASSIGN:
420	assert( untypedExpr->get_args().size() == 2 );
421	output << "(";
422	(arg++)->accept( this );
423	output << opInfo.symbol;
424	(arg)->accept( this );
425	output << ")";
426	break;
427
428	case OT_CONSTANT:
429	// there are no intrinsic definitions of 0 or 1 as functions
430	assert( false );
431	}
432	} else {
433	nameExpr->accept( *this );
434	output << "(";
435	genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
436	output << ")";
437	} // if
438	} else {
439	untypedExpr->get_function()->accept( *this );
440	output << "(";
441	genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
442	output << ")";
443	} // if
444	}
445
446	void CodeGenerator::visit( NameExpr *nameExpr ) {
447	OperatorInfo opInfo;
448	if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
449	assert( opInfo.type == OT_CONSTANT );
450	output << opInfo.symbol;
451	} else {
452	output << nameExpr->get_name();
453	} // if
454	}
455
456	void CodeGenerator::visit( AddressExpr *addressExpr ) {
457	output << "(&";
458	// this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
459	if ( VariableExpr variableExpr = dynamic_cast< VariableExpr >( addressExpr->get_arg() ) ) {
460	output << mangleName( variableExpr->get_var() );
461	} else {
462	addressExpr->get_arg()->accept( *this );
463	} // if
464	output << ")";
465	}
466
467	void CodeGenerator::visit( CastExpr *castExpr ) {
468	output << "(";
469	if ( castExpr->get_results().empty() ) {
470	output << "(void)" ;
471	} else if ( ! castExpr->get_results().front()->get_isLvalue() ) {
472	// at least one result type of cast, but not an lvalue
473	output << "(";
474	output << genType( castExpr->get_results().front(), "" );
475	output << ")";
476	} else {
477	// otherwise, the cast is to an lvalue type, so the cast
478	// should be dropped, since the result of a cast is
479	// never an lvalue in C
480	}
481	castExpr->get_arg()->accept( *this );
482	output << ")";
483	}
484
485	void CodeGenerator::visit( UntypedMemberExpr *memberExpr ) {
486	assert( false );
487	}
488
489	void CodeGenerator::visit( MemberExpr *memberExpr ) {
490	memberExpr->get_aggregate()->accept( *this );
491	output << "." << mangleName( memberExpr->get_member() );
492	}
493
494	void CodeGenerator::visit( VariableExpr *variableExpr ) {
495	OperatorInfo opInfo;
496	if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
497	output << opInfo.symbol;
498	} else {
499	output << mangleName( variableExpr->get_var() );
500	} // if
501	}
502
503	void CodeGenerator::visit( ConstantExpr *constantExpr ) {
504	assert( constantExpr->get_constant() );
505	constantExpr->get_constant()->accept( *this );
506	}
507
508	void CodeGenerator::visit( SizeofExpr *sizeofExpr ) {
509	output << "sizeof(";
510	if ( sizeofExpr->get_isType() ) {
511	output << genType( sizeofExpr->get_type(), "" );
512	} else {
513	sizeofExpr->get_expr()->accept( *this );
514	} // if
515	output << ")";
516	}
517
518	void CodeGenerator::visit( AlignofExpr *alignofExpr ) {
519	// use GCC extension to avoid bumping std to C11
520	output << "__alignof__(";
521	if ( alignofExpr->get_isType() ) {
522	output << genType( alignofExpr->get_type(), "" );
523	} else {
524	alignofExpr->get_expr()->accept( *this );
525	} // if
526	output << ")";
527	}
528
529	void CodeGenerator::visit( UntypedOffsetofExpr *offsetofExpr ) {
530	assert( false && "UntypedOffsetofExpr should not reach code generation" );
531	}
532
533	void CodeGenerator::visit( OffsetofExpr *offsetofExpr ) {
534	// use GCC builtin
535	output << "__builtin_offsetof(";
536	output << genType( offsetofExpr->get_type(), "" );
537	output << ", " << mangleName( offsetofExpr->get_member() );
538	output << ")";
539	}
540
541	void CodeGenerator::visit( OffsetPackExpr *offsetPackExpr ) {
542	assert( false && "OffsetPackExpr should not reach code generation" );
543	}
544
545	void CodeGenerator::visit( LogicalExpr *logicalExpr ) {
546	output << "(";
547	logicalExpr->get_arg1()->accept( *this );
548	if ( logicalExpr->get_isAnd() ) {
549	output << " && ";
550	} else {
551	output << " \|\| ";
552	} // if
553	logicalExpr->get_arg2()->accept( *this );
554	output << ")";
555	}
556
557	void CodeGenerator::visit( ConditionalExpr *conditionalExpr ) {
558	output << "(";
559	conditionalExpr->get_arg1()->accept( *this );
560	output << " ? ";
561	conditionalExpr->get_arg2()->accept( *this );
562	output << " : ";
563	conditionalExpr->get_arg3()->accept( *this );
564	output << ")";
565	}
566
567	void CodeGenerator::visit( CommaExpr *commaExpr ) {
568	output << "(";
569	commaExpr->get_arg1()->accept( *this );
570	output << " , ";
571	commaExpr->get_arg2()->accept( *this );
572	output << ")";
573	}
574
575	void CodeGenerator::visit( TupleExpr *tupleExpr ) {}
576
577	void CodeGenerator::visit( TypeExpr *typeExpr ) {}
578
579	void CodeGenerator::visit( AsmExpr *asmExpr ) {
580	if ( asmExpr->get_inout() ) {
581	output << "[ ";
582	asmExpr->get_inout()->accept( *this );
583	output << " ] ";
584	} // if
585	asmExpr->get_constraint()->accept( *this );
586	output << " ( ";
587	asmExpr->get_operand()->accept( *this );
588	output << " )";
589	}
590
591	//*** Statements
592	void CodeGenerator::visit( CompoundStmt *compoundStmt ) {
593	std::list<Statement*> ks = compoundStmt->get_kids();
594	output << "{" << endl;
595
596	cur_indent += CodeGenerator::tabsize;
597
598	for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
599	output << indent << printLabels( (*i)->get_labels() );
600	(i)->accept( this );
601
602	output << endl;
603	if ( wantSpacing( *i ) ) {
604	output << endl;
605	}
606	}
607	cur_indent -= CodeGenerator::tabsize;
608
609	output << indent << "}";
610	}
611
612	void CodeGenerator::visit( ExprStmt *exprStmt ) {
613	// I don't see why this check is necessary.
614	// If this starts to cause problems then put it back in,
615	// with an explanation
616	assert( exprStmt );
617
618	// if ( exprStmt != 0 ) {
619	exprStmt->get_expr()->accept( *this );
620	output << ";" ;
621	// } // if
622	}
623
624	void CodeGenerator::visit( AsmStmt *asmStmt ) {
625	output << "asm ";
626	if ( asmStmt->get_voltile() ) output << "volatile ";
627	if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
628	output << "( ";
629	if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
630	output << " : ";
631	genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
632	output << " : ";
633	genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
634	output << " : ";
635	genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
636	if ( ! asmStmt->get_gotolabels().empty() ) {
637	output << " : ";
638	for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
639	output << *begin++;
640	if ( begin == asmStmt->get_gotolabels().end() ) break;
641	output << ", ";
642	} // for
643	} // if
644	output << " );" ;
645	}
646
647	void CodeGenerator::visit( IfStmt *ifStmt ) {
648	output << "if ( ";
649	ifStmt->get_condition()->accept( *this );
650	output << " ) ";
651
652	ifStmt->get_thenPart()->accept( *this );
653
654	if ( ifStmt->get_elsePart() != 0) {
655	output << " else ";
656	ifStmt->get_elsePart()->accept( *this );
657	} // if
658	}
659
660	void CodeGenerator::visit( SwitchStmt *switchStmt ) {
661	output << "switch ( " ;
662	switchStmt->get_condition()->accept( *this );
663	output << " ) ";
664
665	output << "{" << std::endl;
666	cur_indent += CodeGenerator::tabsize;
667
668	acceptAll( switchStmt->get_branches(), *this );
669
670	cur_indent -= CodeGenerator::tabsize;
671
672	output << indent << "}";
673	}
674
675	void CodeGenerator::visit( CaseStmt *caseStmt ) {
676	output << indent;
677	if ( caseStmt->isDefault()) {
678	output << "default";
679	} else {
680	output << "case ";
681	caseStmt->get_condition()->accept( *this );
682	} // if
683	output << ":\n";
684
685	std::list<Statement *> sts = caseStmt->get_statements();
686
687	cur_indent += CodeGenerator::tabsize;
688	for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
689	output << indent << printLabels( (*i)->get_labels() ) ;
690	(i)->accept( this );
691	output << endl;
692	}
693	cur_indent -= CodeGenerator::tabsize;
694	}
695
696	void CodeGenerator::visit( BranchStmt *branchStmt ) {
697	switch ( branchStmt->get_type()) {
698	case BranchStmt::Goto:
699	if ( ! branchStmt->get_target().empty() )
700	output << "goto " << branchStmt->get_target();
701	else {
702	if ( branchStmt->get_computedTarget() != 0 ) {
703	output << "goto *";
704	branchStmt->get_computedTarget()->accept( *this );
705	} // if
706	} // if
707	break;
708	case BranchStmt::Break:
709	output << "break";
710	break;
711	case BranchStmt::Continue:
712	output << "continue";
713	break;
714	}
715	output << ";";
716	}
717
718
719	void CodeGenerator::visit( ReturnStmt *returnStmt ) {
720	output << "return ";
721
722	// xxx -- check for null expression;
723	if ( returnStmt->get_expr() ) {
724	returnStmt->get_expr()->accept( *this );
725	} // if
726	output << ";";
727	}
728
729	void CodeGenerator::visit( WhileStmt *whileStmt ) {
730	if ( whileStmt->get_isDoWhile() )
731	output << "do" ;
732	else {
733	output << "while (" ;
734	whileStmt->get_condition()->accept( *this );
735	output << ")";
736	} // if
737	output << " ";
738
739	output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
740	whileStmt->get_body()->accept( *this );
741
742	output << indent;
743
744	if ( whileStmt->get_isDoWhile() ) {
745	output << " while (" ;
746	whileStmt->get_condition()->accept( *this );
747	output << ");";
748	} // if
749	}
750
751	void CodeGenerator::visit( ForStmt *forStmt ) {
752	// initialization is always hoisted, so don't
753	// bother doing anything with that
754	output << "for (;";
755
756	if ( forStmt->get_condition() != 0 )
757	forStmt->get_condition()->accept( *this );
758	output << ";";
759
760	if ( forStmt->get_increment() != 0 )
761	forStmt->get_increment()->accept( *this );
762	output << ") ";
763
764	if ( forStmt->get_body() != 0 ) {
765	output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
766	forStmt->get_body()->accept( *this );
767	} // if
768	}
769
770	void CodeGenerator::visit( NullStmt *nullStmt ) {
771	//output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
772	output << "/* null statement */ ;";
773	}
774
775	void CodeGenerator::visit( DeclStmt *declStmt ) {
776	declStmt->get_decl()->accept( *this );
777
778	if ( doSemicolon( declStmt->get_decl() ) ) {
779	output << ";";
780	} // if
781	}
782
783	std::string CodeGenerator::printLabels( std::list< Label > &l ) {
784	std::string str( "" );
785	l.unique(); // assumes a sorted list. Why not use set?
786
787	for ( std::list< Label >::iterator i = l.begin(); i != l.end(); i++ )
788	str += *i + ": ";
789
790	return str;
791	}
792
793	void CodeGenerator::handleStorageClass( Declaration *decl ) {
794	switch ( decl->get_storageClass() ) {
795	case DeclarationNode::Extern:
796	output << "extern ";
797	break;
798	case DeclarationNode::Static:
799	output << "static ";
800	break;
801	case DeclarationNode::Auto:
802	// silently drop storage class
803	break;
804	case DeclarationNode::Register:
805	output << "register ";
806	break;
807	case DeclarationNode::Inline:
808	output << "inline ";
809	break;
810	case DeclarationNode::Fortran:
811	output << "fortran ";
812	break;
813	case DeclarationNode::Noreturn:
814	output << "_Noreturn ";
815	break;
816	case DeclarationNode::Threadlocal:
817	output << "_Thread_local ";
818	break;
819	case DeclarationNode::NoStorageClass:
820	break;
821	} // switch
822	}
823	} // namespace CodeGen
824
825	// Local Variables: //
826	// tab-width: 4 //
827	// mode: c++ //
828	// compile-command: "make install" //
829	// End: //

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source: src/CodeGen/CodeGenerator.cc @ 7b21d99

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