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source: src/CodeGen/CodeGenerator.cc @ 5c3632f

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

Last change on this file since 5c3632f was fbcde64, checked in by Peter A. Buhr <pabuhr@…>, 8 years ago
remove duplication in compound literal, support aggregate-type compound literals
Property mode set to `100644`
File size: 27.5 KB

Line
1	//
2	// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
3	//
4	// The contents of this file are covered under the licence agreement in the
5	// file "LICENCE" distributed with Cforall.
6	//
7	// CodeGenerator.cc --
8	//
9	// Author : Richard C. Bilson
10	// Created On : Mon May 18 07:44:20 2015
11	// Last Modified By : Peter A. Buhr
12	// Last Modified On : Thu Mar 30 16:38:01 2017
13	// Update Count : 482
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	void CodeGenerator::asmName( DeclarationWithType * decl ) {
63	if ( ConstantExpr * asmName = decl->get_asmName() ) {
64	output << " asm ( " << asmName->get_constant()->get_value() << " )";
65	} // if
66	} // extension
67
68	ostream & CodeGenerator::Indenter::operator()( ostream & output ) const {
69	return output << string( cg.cur_indent, ' ' );
70	}
71
72	ostream & operator<<( ostream & output, const CodeGenerator::Indenter &indent ) {
73	return indent( output );
74	}
75
76	CodeGenerator::LabelPrinter & CodeGenerator::LabelPrinter::operator()( std::list< Label > & l ) {
77	labels = &l;
78	return *this;
79	}
80
81	ostream & operator<<( ostream & output, CodeGenerator::LabelPrinter & printLabels ) {
82	std::list< Label > & labs = *printLabels.labels;
83	// l.unique(); // assumes a sorted list. Why not use set? Does order matter?
84	for ( Label & l : labs ) {
85	output << l.get_name() + ": ";
86	printLabels.cg.genAttributes( l.get_attributes() );
87	} // for
88	return output;
89	}
90
91	CodeGenerator::CodeGenerator( std::ostream & os, bool pretty ) : indent( this), cur_indent( 0 ), insideFunction( false ), output( os ), printLabels( this ), pretty( pretty ) {}
92
93	CodeGenerator::CodeGenerator( std::ostream & os, std::string init, int indentation, bool infunp )
94	: indent( this), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( this ) {
95	//output << std::string( init );
96	}
97
98	CodeGenerator::CodeGenerator( std::ostream & os, char * init, int indentation, bool infunp )
99	: indent( this ), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( this ) {
100	//output << std::string( init );
101	}
102
103	string CodeGenerator::mangleName( DeclarationWithType * decl ) {
104	if ( pretty ) return decl->get_name();
105	if ( decl->get_mangleName() != "" ) {
106	// need to incorporate scope level in order to differentiate names for destructors
107	return decl->get_scopedMangleName();
108	} else {
109	return decl->get_name();
110	} // if
111	}
112
113	void CodeGenerator::genAttributes( list< Attribute * > & attributes ) {
114	if ( attributes.empty() ) return;
115	output << "__attribute__ ((";
116	for ( list< Attribute * >::iterator attr( attributes.begin() );; ) {
117	output << (*attr)->get_name();
118	if ( ! (*attr)->get_parameters().empty() ) {
119	output << "(";
120	genCommaList( (attr)->get_parameters().begin(), (attr)->get_parameters().end() );
121	output << ")";
122	} // if
123	if ( ++attr == attributes.end() ) break;
124	output << ","; // separator
125	} // for
126	output << ")) ";
127	} // CodeGenerator::genAttributes
128
129
130	//*** Declarations
131	void CodeGenerator::visit( FunctionDecl * functionDecl ) {
132	extension( functionDecl );
133	genAttributes( functionDecl->get_attributes() );
134
135	handleStorageClass( functionDecl );
136	functionDecl->get_funcSpec().print( output );
137
138	output << genType( functionDecl->get_functionType(), mangleName( functionDecl ), pretty );
139
140	asmName( functionDecl );
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	if (objectDecl->get_name().empty()) {
150	static UniqueName name = { "__anonymous_object" };
151	objectDecl->set_name( name.newName() );
152	}
153
154	extension( objectDecl );
155	genAttributes( objectDecl->get_attributes() );
156
157	handleStorageClass( objectDecl );
158	output << genType( objectDecl->get_type(), mangleName( objectDecl ), pretty );
159
160	asmName( objectDecl );
161
162	if ( objectDecl->get_init() ) {
163	output << " = ";
164	objectDecl->get_init()->accept( *this );
165	} // if
166
167	if ( objectDecl->get_bitfieldWidth() ) {
168	output << ":";
169	objectDecl->get_bitfieldWidth()->accept( *this );
170	} // if
171	}
172
173	void CodeGenerator::handleAggregate( AggregateDecl * aggDecl ) {
174	genAttributes( aggDecl->get_attributes() );
175
176	if ( aggDecl->get_name() != "" )
177	output << aggDecl->get_name();
178
179	// std::list< Declaration * > & memb = aggDecl->get_members();
180	// if ( ! memb.empty() ) {
181	if ( aggDecl->has_body() ) {
182	std::list< Declaration * > & memb = aggDecl->get_members();
183	output << " {" << endl;
184
185	cur_indent += CodeGenerator::tabsize;
186	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
187	output << indent;
188	(i)->accept( this );
189	output << ";" << endl;
190	} // for
191
192	cur_indent -= CodeGenerator::tabsize;
193
194	output << indent << "}";
195	} // if
196	}
197
198	void CodeGenerator::visit( StructDecl * structDecl ) {
199	extension( structDecl );
200	output << "struct ";
201	handleAggregate( structDecl );
202	}
203
204	void CodeGenerator::visit( UnionDecl * unionDecl ) {
205	extension( unionDecl );
206	output << "union ";
207	handleAggregate( unionDecl );
208	}
209
210	void CodeGenerator::visit( EnumDecl * enumDecl ) {
211	extension( enumDecl );
212	output << "enum ";
213	genAttributes( enumDecl->get_attributes() );
214
215	if ( enumDecl->get_name() != "" )
216	output << enumDecl->get_name();
217
218	std::list< Declaration* > &memb = enumDecl->get_members();
219
220	if ( ! memb.empty() ) {
221	output << " {" << endl;
222
223	cur_indent += CodeGenerator::tabsize;
224	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
225	ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
226	assert( obj );
227	output << indent << mangleName( obj );
228	if ( obj->get_init() ) {
229	output << " = ";
230	obj->get_init()->accept( *this );
231	} // if
232	output << "," << endl;
233	} // for
234
235	cur_indent -= CodeGenerator::tabsize;
236
237	output << indent << "}";
238	} // if
239	}
240
241	void CodeGenerator::visit( TraitDecl * traitDecl ) {}
242
243	void CodeGenerator::visit( TypedefDecl * typeDecl ) {
244	assert( false && "Typedefs are removed and substituted in earlier passes." );
245	//output << "typedef ";
246	//output << genType( typeDecl->get_base(), typeDecl->get_name(), pretty );
247	}
248
249	void CodeGenerator::visit( TypeDecl * typeDecl ) {
250	// really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
251	// still to be done
252	extension( typeDecl );
253	output << "extern unsigned long " << typeDecl->get_name();
254	if ( typeDecl->get_base() ) {
255	output << " = sizeof( " << genType( typeDecl->get_base(), "", pretty ) << " )";
256	} // if
257	}
258
259	void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
260	typedef std::list< Expression * > DesignatorList;
261	if ( designators.size() == 0 ) return;
262	for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
263	if ( dynamic_cast< NameExpr * >( *iter ) ) {
264	// if expression is a name, then initializing aggregate member
265	output << ".";
266	(iter)->accept( this );
267	} else {
268	// if not a simple name, it has to be a constant expression, i.e. an array designator
269	output << "[";
270	(iter)->accept( this );
271	output << "]";
272	} // if
273	} // for
274	output << " = ";
275	}
276
277	void CodeGenerator::visit( SingleInit * init ) {
278	printDesignators( init->get_designators() );
279	init->get_value()->accept( *this );
280	}
281
282	void CodeGenerator::visit( ListInit * init ) {
283	printDesignators( init->get_designators() );
284	output << "{ ";
285	if ( init->begin() == init->end() ) {
286	// illegal to leave initializer list empty for scalar initializers, but always legal to have 0
287	output << "0";
288	} else {
289	genCommaList( init->begin(), init->end() );
290	} // if
291	output << " }";
292	}
293
294	void CodeGenerator::visit( ConstructorInit * init ){
295	assertf( false, "ConstructorInit nodes should not make it to CodeGen." );
296	}
297
298	void CodeGenerator::visit( Constant * constant ) {
299	output << constant->get_value() ;
300	}
301
302	//*** Expressions
303	void CodeGenerator::visit( ApplicationExpr * applicationExpr ) {
304	extension( applicationExpr );
305	if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
306	OperatorInfo opInfo;
307	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
308	std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
309	switch ( opInfo.type ) {
310	case OT_PREFIXASSIGN:
311	case OT_POSTFIXASSIGN:
312	case OT_INFIXASSIGN:
313	case OT_CTOR:
314	case OT_DTOR:
315	{
316	assert( arg != applicationExpr->get_args().end() );
317	if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) {
318	// remove & from first assignment/ctor argument
319	*arg = addrExpr->get_arg();
320	} else {
321	// no address-of operator, so must be a pointer - add dereference
322	// NOTE: if the assertion starts to trigger, check that the application expr isn't being shared.
323	// Since its arguments are modified here, this assertion most commonly triggers when the application
324	// is visited multiple times.
325	UntypedExpr * newExpr = new UntypedExpr( new NameExpr( "*?" ) );
326	newExpr->get_args().push_back( *arg );
327	Type * type = InitTweak::getPointerBase( (*arg)->get_result() );
328	assertf( type, "First argument to a derefence must be a pointer. Ensure that expressions are not being shared." );
329	newExpr->set_result( type->clone() );
330	*arg = newExpr;
331	} // if
332	break;
333	}
334
335	default:
336	// do nothing
337	;
338	} // switch
339
340	switch ( opInfo.type ) {
341	case OT_INDEX:
342	assert( applicationExpr->get_args().size() == 2 );
343	(arg++)->accept( this );
344	output << "[";
345	(arg)->accept( this );
346	output << "]";
347	break;
348
349	case OT_CALL:
350	// there are no intrinsic definitions of the function call operator
351	assert( false );
352	break;
353
354	case OT_CTOR:
355	case OT_DTOR:
356	if ( applicationExpr->get_args().size() == 1 ) {
357	// the expression fed into a single parameter constructor or destructor may contain side
358	// effects, so must still output this expression
359	output << "(";
360	(arg++)->accept( this );
361	output << ") /* " << opInfo.inputName << " */";
362	} else if ( applicationExpr->get_args().size() == 2 ) {
363	// intrinsic two parameter constructors are essentially bitwise assignment
364	output << "(";
365	(arg++)->accept( this );
366	output << opInfo.symbol;
367	(arg)->accept( this );
368	output << ") /* " << opInfo.inputName << " */";
369	} else {
370	// no constructors with 0 or more than 2 parameters
371	assert( false );
372	} // if
373	break;
374
375	case OT_PREFIX:
376	case OT_PREFIXASSIGN:
377	assert( applicationExpr->get_args().size() == 1 );
378	output << "(";
379	output << opInfo.symbol;
380	(arg)->accept( this );
381	output << ")";
382	break;
383
384	case OT_POSTFIX:
385	case OT_POSTFIXASSIGN:
386	assert( applicationExpr->get_args().size() == 1 );
387	(arg)->accept( this );
388	output << opInfo.symbol;
389	break;
390
391
392	case OT_INFIX:
393	case OT_INFIXASSIGN:
394	assert( applicationExpr->get_args().size() == 2 );
395	output << "(";
396	(arg++)->accept( this );
397	output << opInfo.symbol;
398	(arg)->accept( this );
399	output << ")";
400	break;
401
402	case OT_CONSTANT:
403	case OT_LABELADDRESS:
404	// there are no intrinsic definitions of 0/1 or label addresses as functions
405	assert( false );
406	} // switch
407	} else {
408	varExpr->accept( *this );
409	output << "(";
410	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
411	output << ")";
412	} // if
413	} else {
414	applicationExpr->get_function()->accept( *this );
415	output << "(";
416	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
417	output << ")";
418	} // if
419	}
420
421	void CodeGenerator::visit( UntypedExpr * untypedExpr ) {
422	extension( untypedExpr );
423	if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
424	OperatorInfo opInfo;
425	if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
426	std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
427	switch ( opInfo.type ) {
428	case OT_INDEX:
429	assert( untypedExpr->get_args().size() == 2 );
430	(arg++)->accept( this );
431	output << "[";
432	(arg)->accept( this );
433	output << "]";
434	break;
435
436	case OT_CALL:
437	assert( false );
438
439	case OT_CTOR:
440	case OT_DTOR:
441	if ( untypedExpr->get_args().size() == 1 ) {
442	// the expression fed into a single parameter constructor or destructor may contain side
443	// effects, so must still output this expression
444	output << "(";
445	(arg++)->accept( this );
446	output << ") /* " << opInfo.inputName << " */";
447	} else if ( untypedExpr->get_args().size() == 2 ) {
448	// intrinsic two parameter constructors are essentially bitwise assignment
449	output << "(";
450	(arg++)->accept( this );
451	output << opInfo.symbol;
452	(arg)->accept( this );
453	output << ") /* " << opInfo.inputName << " */";
454	} else {
455	// no constructors with 0 or more than 2 parameters
456	assert( false );
457	} // if
458	break;
459
460	case OT_PREFIX:
461	case OT_PREFIXASSIGN:
462	case OT_LABELADDRESS:
463	assert( untypedExpr->get_args().size() == 1 );
464	output << "(";
465	output << opInfo.symbol;
466	(arg)->accept( this );
467	output << ")";
468	break;
469
470	case OT_POSTFIX:
471	case OT_POSTFIXASSIGN:
472	assert( untypedExpr->get_args().size() == 1 );
473	(arg)->accept( this );
474	output << opInfo.symbol;
475	break;
476
477	case OT_INFIX:
478	case OT_INFIXASSIGN:
479	assert( untypedExpr->get_args().size() == 2 );
480	output << "(";
481	(arg++)->accept( this );
482	output << opInfo.symbol;
483	(arg)->accept( this );
484	output << ")";
485	break;
486
487	case OT_CONSTANT:
488	// there are no intrinsic definitions of 0 or 1 as functions
489	assert( false );
490	} // switch
491	} else {
492	if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
493	assert( untypedExpr->get_args().size() == 2 );
494	(untypedExpr->get_args().begin())->accept( this );
495	output << " ... ";
496	(--untypedExpr->get_args().end())->accept( this );
497	} else { // builtin routines
498	nameExpr->accept( *this );
499	output << "(";
500	genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
501	output << ")";
502	} // if
503	} // if
504	} else {
505	untypedExpr->get_function()->accept( *this );
506	output << "(";
507	genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
508	output << ")";
509	} // if
510	}
511
512	void CodeGenerator::visit( RangeExpr * rangeExpr ) {
513	rangeExpr->get_low()->accept( *this );
514	output << " ... ";
515	rangeExpr->get_high()->accept( *this );
516	}
517
518	void CodeGenerator::visit( NameExpr * nameExpr ) {
519	extension( nameExpr );
520	OperatorInfo opInfo;
521	if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
522	assert( opInfo.type == OT_CONSTANT );
523	output << opInfo.symbol;
524	} else {
525	output << nameExpr->get_name();
526	} // if
527	}
528
529	void CodeGenerator::visit( AddressExpr * addressExpr ) {
530	extension( addressExpr );
531	output << "(&";
532	// this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
533	if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
534	output << mangleName( variableExpr->get_var() );
535	} else {
536	addressExpr->get_arg()->accept( *this );
537	} // if
538	output << ")";
539	}
540
541	void CodeGenerator::visit( CastExpr * castExpr ) {
542	extension( castExpr );
543	output << "(";
544	if ( castExpr->get_result()->isVoid() ) {
545	output << "(void)" ;
546	} else if ( ! castExpr->get_result()->get_lvalue() ) {
547	// at least one result type of cast, but not an lvalue
548	output << "(";
549	output << genType( castExpr->get_result(), "", pretty );
550	output << ")";
551	} else {
552	// otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
553	// never an lvalue in C
554	} // if
555	castExpr->get_arg()->accept( *this );
556	output << ")";
557	}
558
559	void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) {
560	assert( false );
561	}
562
563	void CodeGenerator::visit( MemberExpr * memberExpr ) {
564	extension( memberExpr );
565	memberExpr->get_aggregate()->accept( *this );
566	output << "." << mangleName( memberExpr->get_member() );
567	}
568
569	void CodeGenerator::visit( VariableExpr * variableExpr ) {
570	extension( variableExpr );
571	OperatorInfo opInfo;
572	if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
573	output << opInfo.symbol;
574	} else {
575	output << mangleName( variableExpr->get_var() );
576	} // if
577	}
578
579	void CodeGenerator::visit( ConstantExpr * constantExpr ) {
580	assert( constantExpr->get_constant() );
581	extension( constantExpr );
582	constantExpr->get_constant()->accept( *this );
583	}
584
585	void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
586	extension( sizeofExpr );
587	output << "sizeof(";
588	if ( sizeofExpr->get_isType() ) {
589	output << genType( sizeofExpr->get_type(), "", pretty );
590	} else {
591	sizeofExpr->get_expr()->accept( *this );
592	} // if
593	output << ")";
594	}
595
596	void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
597	// use GCC extension to avoid bumping std to C11
598	extension( alignofExpr );
599	output << "__alignof__(";
600	if ( alignofExpr->get_isType() ) {
601	output << genType( alignofExpr->get_type(), "", pretty );
602	} else {
603	alignofExpr->get_expr()->accept( *this );
604	} // if
605	output << ")";
606	}
607
608	void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
609	assert( false && "UntypedOffsetofExpr should not reach code generation." );
610	}
611
612	void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
613	// use GCC builtin
614	output << "__builtin_offsetof(";
615	output << genType( offsetofExpr->get_type(), "", pretty );
616	output << ", " << mangleName( offsetofExpr->get_member() );
617	output << ")";
618	}
619
620	void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
621	assert( false && "OffsetPackExpr should not reach code generation." );
622	}
623
624	void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
625	extension( logicalExpr );
626	output << "(";
627	logicalExpr->get_arg1()->accept( *this );
628	if ( logicalExpr->get_isAnd() ) {
629	output << " && ";
630	} else {
631	output << " \|\| ";
632	} // if
633	logicalExpr->get_arg2()->accept( *this );
634	output << ")";
635	}
636
637	void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
638	extension( conditionalExpr );
639	output << "(";
640	conditionalExpr->get_arg1()->accept( *this );
641	output << " ? ";
642	conditionalExpr->get_arg2()->accept( *this );
643	output << " : ";
644	conditionalExpr->get_arg3()->accept( *this );
645	output << ")";
646	}
647
648	void CodeGenerator::visit( CommaExpr * commaExpr ) {
649	extension( commaExpr );
650	output << "(";
651	commaExpr->get_arg1()->accept( *this );
652	output << " , ";
653	commaExpr->get_arg2()->accept( *this );
654	output << ")";
655	}
656
657	void CodeGenerator::visit( UntypedTupleExpr * tupleExpr ) { assertf( false, "UntypedTupleExpr should not make it to Code Gen" ); }
658
659	void CodeGenerator::visit( TupleExpr * tupleExpr ) { assertf( false, "TupleExpr should not make it to Code Gen" ); }
660
661	void CodeGenerator::visit( TypeExpr * typeExpr ) {}
662
663	void CodeGenerator::visit( AsmExpr * asmExpr ) {
664	if ( asmExpr->get_inout() ) {
665	output << "[ ";
666	asmExpr->get_inout()->accept( *this );
667	output << " ] ";
668	} // if
669	asmExpr->get_constraint()->accept( *this );
670	output << " ( ";
671	asmExpr->get_operand()->accept( *this );
672	output << " )";
673	}
674
675	void CodeGenerator::visit( CompoundLiteralExpr *compLitExpr ) {
676	assert( compLitExpr->get_result() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
677	output << "(" << genType( compLitExpr->get_result(), "", pretty ) << ")";
678	compLitExpr->get_initializer()->accept( *this );
679	}
680
681	void CodeGenerator::visit( StmtExpr * stmtExpr ) {
682	std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
683	output << "({" << std::endl;
684	cur_indent += CodeGenerator::tabsize;
685	unsigned int numStmts = stmts.size();
686	unsigned int i = 0;
687	for ( Statement * stmt : stmts ) {
688	output << indent << printLabels( stmt->get_labels() );
689	if ( i+1 == numStmts ) {
690	// last statement in a statement expression needs to be handled specially -
691	// cannot cast to void, otherwise the expression statement has no value
692	if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
693	exprStmt->get_expr()->accept( *this );
694	output << ";" << endl;
695	++i;
696	break;
697	}
698	}
699	stmt->accept( *this );
700	output << endl;
701	if ( wantSpacing( stmt ) ) {
702	output << endl;
703	} // if
704	++i;
705	}
706	cur_indent -= CodeGenerator::tabsize;
707	output << indent << "})";
708	}
709
710	//*** Statements
711	void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
712	std::list<Statement*> ks = compoundStmt->get_kids();
713	output << "{" << endl;
714
715	cur_indent += CodeGenerator::tabsize;
716
717	for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
718	output << indent << printLabels( (*i)->get_labels() );
719	(i)->accept( this );
720
721	output << endl;
722	if ( wantSpacing( *i ) ) {
723	output << endl;
724	} // if
725	} // for
726	cur_indent -= CodeGenerator::tabsize;
727
728	output << indent << "}";
729	}
730
731	void CodeGenerator::visit( ExprStmt * exprStmt ) {
732	assert( exprStmt );
733	// cast the top-level expression to void to reduce gcc warnings.
734	Expression * expr = new CastExpr( exprStmt->get_expr() );
735	expr->accept( *this );
736	output << ";";
737	}
738
739	void CodeGenerator::visit( AsmStmt * asmStmt ) {
740	output << "asm ";
741	if ( asmStmt->get_voltile() ) output << "volatile ";
742	if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
743	output << "( ";
744	if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
745	output << " : ";
746	genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
747	output << " : ";
748	genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
749	output << " : ";
750	genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
751	if ( ! asmStmt->get_gotolabels().empty() ) {
752	output << " : ";
753	for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
754	output << *begin++;
755	if ( begin == asmStmt->get_gotolabels().end() ) break;
756	output << ", ";
757	} // for
758	} // if
759	output << " );" ;
760	}
761
762	void CodeGenerator::visit( AsmDecl * asmDecl ) {
763	output << "asm ";
764	AsmStmt * asmStmt = asmDecl->get_stmt();
765	output << "( ";
766	if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
767	output << " )" ;
768	}
769
770	void CodeGenerator::visit( IfStmt * ifStmt ) {
771	output << "if ( ";
772	ifStmt->get_condition()->accept( *this );
773	output << " ) ";
774
775	ifStmt->get_thenPart()->accept( *this );
776
777	if ( ifStmt->get_elsePart() != 0) {
778	output << " else ";
779	ifStmt->get_elsePart()->accept( *this );
780	} // if
781	}
782
783	void CodeGenerator::visit( SwitchStmt * switchStmt ) {
784	output << "switch ( " ;
785	switchStmt->get_condition()->accept( *this );
786	output << " ) ";
787
788	output << "{" << std::endl;
789	cur_indent += CodeGenerator::tabsize;
790	acceptAll( switchStmt->get_statements(), *this );
791	cur_indent -= CodeGenerator::tabsize;
792	output << indent << "}";
793	}
794
795	void CodeGenerator::visit( CaseStmt * caseStmt ) {
796	output << indent;
797	if ( caseStmt->isDefault()) {
798	output << "default";
799	} else {
800	output << "case ";
801	caseStmt->get_condition()->accept( *this );
802	} // if
803	output << ":\n";
804
805	std::list<Statement *> sts = caseStmt->get_statements();
806
807	cur_indent += CodeGenerator::tabsize;
808	for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
809	output << indent << printLabels( (*i)->get_labels() ) ;
810	(i)->accept( this );
811	output << endl;
812	} // for
813	cur_indent -= CodeGenerator::tabsize;
814	}
815
816	void CodeGenerator::visit( BranchStmt * branchStmt ) {
817	switch ( branchStmt->get_type()) {
818	case BranchStmt::Goto:
819	if ( ! branchStmt->get_target().empty() )
820	output << "goto " << branchStmt->get_target();
821	else {
822	if ( branchStmt->get_computedTarget() != 0 ) {
823	output << "goto *";
824	branchStmt->get_computedTarget()->accept( *this );
825	} // if
826	} // if
827	break;
828	case BranchStmt::Break:
829	output << "break";
830	break;
831	case BranchStmt::Continue:
832	output << "continue";
833	break;
834	} // switch
835	output << ";";
836	}
837
838	void CodeGenerator::visit( ReturnStmt * returnStmt ) {
839	output << "return ";
840	maybeAccept( returnStmt->get_expr(), *this );
841	output << ";";
842	}
843
844	void CodeGenerator::visit( WhileStmt * whileStmt ) {
845	if ( whileStmt->get_isDoWhile() ) {
846	output << "do" ;
847	} else {
848	output << "while (" ;
849	whileStmt->get_condition()->accept( *this );
850	output << ")";
851	} // if
852	output << " ";
853
854	output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
855	whileStmt->get_body()->accept( *this );
856
857	output << indent;
858
859	if ( whileStmt->get_isDoWhile() ) {
860	output << " while (" ;
861	whileStmt->get_condition()->accept( *this );
862	output << ");";
863	} // if
864	}
865
866	void CodeGenerator::visit( ForStmt * forStmt ) {
867	// initialization is always hoisted, so don't bother doing anything with that
868	output << "for (;";
869
870	if ( forStmt->get_condition() != 0 ) {
871	forStmt->get_condition()->accept( *this );
872	} // if
873	output << ";";
874
875	if ( forStmt->get_increment() != 0 ) {
876	// cast the top-level expression to void to reduce gcc warnings.
877	Expression * expr = new CastExpr( forStmt->get_increment() );
878	expr->accept( *this );
879	} // if
880	output << ") ";
881
882	if ( forStmt->get_body() != 0 ) {
883	output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
884	forStmt->get_body()->accept( *this );
885	} // if
886	}
887
888	void CodeGenerator::visit( NullStmt * nullStmt ) {
889	//output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
890	output << "/* null statement */ ;";
891	}
892
893	void CodeGenerator::visit( DeclStmt * declStmt ) {
894	declStmt->get_decl()->accept( *this );
895
896	if ( doSemicolon( declStmt->get_decl() ) ) {
897	output << ";";
898	} // if
899	}
900
901	void CodeGenerator::handleStorageClass( DeclarationWithType * decl ) {
902	if ( decl->get_storageClasses().any() ) {
903	decl->get_storageClasses().print( output );
904	} // if
905	} // CodeGenerator::handleStorageClass
906
907	std::string genName( DeclarationWithType * decl ) {
908	CodeGen::OperatorInfo opInfo;
909	if ( operatorLookup( decl->get_name(), opInfo ) ) {
910	return opInfo.outputName;
911	} else {
912	return decl->get_name();
913	} // if
914	}
915	} // namespace CodeGen
916
917	// Local Variables: //
918	// tab-width: 4 //
919	// mode: c++ //
920	// compile-command: "make install" //
921	// End: //

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