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source: src/CodeGen/CodeGenerator.cc @ 0a81c3f

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 0a81c3f was 0a81c3f, checked in by Rob Schluntz <rschlunt@…>, 7 years ago
Remove several missing-reference related hacks
Property mode set to `100644`
File size: 29.1 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 : Andrew Beach
12	// Last Modified On : Thu Jun 8 16:00:00 2017
13	// Update Count : 485
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	CodeGenerator::LabelPrinter & CodeGenerator::LabelPrinter::operator()( std::list< Label > & l ) {
69	labels = &l;
70	return *this;
71	}
72
73	ostream & operator<<( ostream & output, CodeGenerator::LabelPrinter & printLabels ) {
74	std::list< Label > & labs = *printLabels.labels;
75	// l.unique(); // assumes a sorted list. Why not use set? Does order matter?
76	for ( Label & l : labs ) {
77	output << l.get_name() + ": ";
78	printLabels.cg.genAttributes( l.get_attributes() );
79	} // for
80	return output;
81	}
82
83	CodeGenerator::LineMarker::LineMarker(
84	CodeLocation const & loc, bool toPrint) :
85	loc(loc), toPrint(toPrint)
86	{}
87
88	CodeGenerator::LineMarker CodeGenerator::lineDirective(
89	BaseSyntaxNode const * node) {
90	return LineMarker(node->location, lineMarks);
91	}
92
93	std::ostream & operator<<(std::ostream & out,
94	CodeGenerator::LineMarker const & marker) {
95	if (marker.toPrint && marker.loc.isSet()) {
96	return out << "\n# " << marker.loc.linenumber << " \""
97	<< marker.loc.filename << "\"\n";
98	} else if (marker.toPrint) {
99	return out << "\n/* Missing CodeLocation */\n";
100	} else {
101	return out;
102	}
103	}
104
105	CodeGenerator::CodeGenerator( std::ostream & os, bool pretty, bool genC, bool lineMarks ) : indent( CodeGenerator::tabsize ), insideFunction( false ), output( os ), printLabels( *this ), pretty( pretty ), genC( genC ), lineMarks( lineMarks ) {}
106
107	string CodeGenerator::mangleName( DeclarationWithType * decl ) {
108	if ( pretty ) return decl->get_name();
109	if ( decl->get_mangleName() != "" ) {
110	// need to incorporate scope level in order to differentiate names for destructors
111	return decl->get_scopedMangleName();
112	} else {
113	return decl->get_name();
114	} // if
115	}
116
117	void CodeGenerator::genAttributes( list< Attribute * > & attributes ) {
118	if ( attributes.empty() ) return;
119	output << "__attribute__ ((";
120	for ( list< Attribute * >::iterator attr( attributes.begin() );; ) {
121	output << (*attr)->get_name();
122	if ( ! (*attr)->get_parameters().empty() ) {
123	output << "(";
124	genCommaList( (attr)->get_parameters().begin(), (attr)->get_parameters().end() );
125	output << ")";
126	} // if
127	if ( ++attr == attributes.end() ) break;
128	output << ","; // separator
129	} // for
130	output << ")) ";
131	} // CodeGenerator::genAttributes
132
133
134	// *** Declarations
135	void CodeGenerator::visit( FunctionDecl * functionDecl ) {
136	extension( functionDecl );
137	genAttributes( functionDecl->get_attributes() );
138
139	handleStorageClass( functionDecl );
140	functionDecl->get_funcSpec().print( output );
141
142	output << genType( functionDecl->get_functionType(), mangleName( functionDecl ), pretty, genC );
143
144	asmName( functionDecl );
145
146	// acceptAll( functionDecl->get_oldDecls(), *this );
147	if ( functionDecl->get_statements() ) {
148	functionDecl->get_statements()->accept( *this );
149	} // if
150	}
151
152	void CodeGenerator::visit( ObjectDecl * objectDecl ) {
153	if (objectDecl->get_name().empty() && genC ) {
154	// only generate an anonymous name when generating C code, otherwise it clutters the output too much
155	static UniqueName name = { "__anonymous_object" };
156	objectDecl->set_name( name.newName() );
157	}
158
159	extension( objectDecl );
160	genAttributes( objectDecl->get_attributes() );
161
162	handleStorageClass( objectDecl );
163	output << genType( objectDecl->get_type(), mangleName( objectDecl ), pretty, genC );
164
165	asmName( objectDecl );
166
167	if ( objectDecl->get_init() ) {
168	output << " = ";
169	objectDecl->get_init()->accept( *this );
170	} // if
171
172	if ( objectDecl->get_bitfieldWidth() ) {
173	output << ":";
174	objectDecl->get_bitfieldWidth()->accept( *this );
175	} // if
176	}
177
178	void CodeGenerator::handleAggregate( AggregateDecl * aggDecl, const std::string & kind ) {
179	genAttributes( aggDecl->get_attributes() );
180
181	if( ! aggDecl->get_parameters().empty() && ! genC ) {
182	// assertf( ! genC, "Aggregate type parameters should not reach code generation." );
183	output << "forall(";
184	genCommaList( aggDecl->get_parameters().begin(), aggDecl->get_parameters().end() );
185	output << ")" << endl;
186	}
187
188	output << kind;
189	if ( aggDecl->get_name() != "" )
190	output << aggDecl->get_name();
191
192	if ( aggDecl->has_body() ) {
193	std::list< Declaration * > & memb = aggDecl->get_members();
194	output << " {" << endl;
195
196	++indent;
197	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
198	output << lineDirective( *i ) << indent;
199	(i)->accept( this );
200	output << ";" << endl;
201	} // for
202
203	--indent;
204
205	output << indent << "}";
206	} // if
207	}
208
209	void CodeGenerator::visit( StructDecl * structDecl ) {
210	extension( structDecl );
211	handleAggregate( structDecl, "struct " );
212	}
213
214	void CodeGenerator::visit( UnionDecl * unionDecl ) {
215	extension( unionDecl );
216	handleAggregate( unionDecl, "union " );
217	}
218
219	void CodeGenerator::visit( EnumDecl * enumDecl ) {
220	extension( enumDecl );
221	output << lineDirective ( enumDecl );
222	output << "enum ";
223	genAttributes( enumDecl->get_attributes() );
224
225	if ( enumDecl->get_name() != "" )
226	output << enumDecl->get_name();
227
228	std::list< Declaration* > &memb = enumDecl->get_members();
229
230	if ( ! memb.empty() ) {
231	output << " {" << endl;
232
233	++indent;
234	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
235	ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
236	assert( obj );
237	output << lineDirective( obj ) << indent << mangleName( obj );
238	if ( obj->get_init() ) {
239	output << " = ";
240	obj->get_init()->accept( *this );
241	} // if
242	output << "," << endl;
243	} // for
244
245	--indent;
246
247	output << indent << "}";
248	} // if
249	}
250
251	void CodeGenerator::visit( __attribute__((unused)) TraitDecl * traitDecl ) {}
252
253	void CodeGenerator::visit( TypedefDecl * typeDecl ) {
254	assertf( ! genC, "Typedefs are removed and substituted in earlier passes." );
255	output << lineDirective( typeDecl );
256	output << "typedef ";
257	output << genType( typeDecl->get_base(), typeDecl->get_name(), pretty, genC ) << endl;
258	}
259
260	void CodeGenerator::visit( TypeDecl * typeDecl ) {
261	if ( genC ) {
262	// really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
263	// still to be done
264	extension( typeDecl );
265	output << "extern unsigned long " << typeDecl->get_name();
266	if ( typeDecl->get_base() ) {
267	output << " = sizeof( " << genType( typeDecl->get_base(), "", pretty, genC ) << " )";
268	} // if
269	} else {
270	output << typeDecl->genTypeString() << " " << typeDecl->get_name();
271	if ( typeDecl->get_kind() != TypeDecl::Any && typeDecl->get_sized() ) {
272	output << " \| sized(" << typeDecl->get_name() << ")";
273	}
274	if ( ! typeDecl->get_assertions().empty() ) {
275	output << " \| { ";
276	genCommaList( typeDecl->get_assertions().begin(), typeDecl->get_assertions().end() );
277	output << " }";
278	}
279	}
280	}
281
282	void CodeGenerator::visit( Designation * designation ) {
283	std::list< Expression * > designators = designation->get_designators();
284	if ( designators.size() == 0 ) return;
285	for ( Expression * des : designators ) {
286	if ( dynamic_cast< NameExpr * >( des ) \|\| dynamic_cast< VariableExpr * >( des ) ) {
287	// if expression is a NameExpr or VariableExpr, then initializing aggregate member
288	output << ".";
289	des->accept( *this );
290	} else {
291	// otherwise, it has to be a ConstantExpr or CastExpr, initializing array eleemnt
292	output << "[";
293	des->accept( *this );
294	output << "]";
295	} // if
296	} // for
297	output << " = ";
298	}
299
300	void CodeGenerator::visit( SingleInit * init ) {
301	init->get_value()->accept( *this );
302	}
303
304	void CodeGenerator::visit( ListInit * init ) {
305	auto initBegin = init->begin();
306	auto initEnd = init->end();
307	auto desigBegin = init->get_designations().begin();
308	auto desigEnd = init->get_designations().end();
309
310	output << "{ ";
311	for ( ; initBegin != initEnd && desigBegin != desigEnd; ) {
312	(desigBegin)->accept( this );
313	(initBegin)->accept( this );
314	++initBegin, ++desigBegin;
315	if ( initBegin != initEnd ) {
316	output << ", ";
317	}
318	}
319	output << " }";
320	assertf( initBegin == initEnd && desigBegin == desigEnd, "Initializers and designators not the same length. %s", toString( init ).c_str() );
321	}
322
323	void CodeGenerator::visit( __attribute__((unused)) ConstructorInit * init ){
324	assertf( ! genC, "ConstructorInit nodes should not reach code generation." );
325	// xxx - generate something reasonable for constructor/destructor pairs
326	output << "<ctorinit>";
327	}
328
329	void CodeGenerator::visit( Constant * constant ) {
330	output << constant->get_value() ;
331	}
332
333	// *** Expressions
334	void CodeGenerator::visit( ApplicationExpr * applicationExpr ) {
335	extension( applicationExpr );
336	if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
337	OperatorInfo opInfo;
338	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
339	std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
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, genC );
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	assertf( ! genC, "UntypedMemberExpr should not reach code generation." );
561	extension( memberExpr );
562	memberExpr->get_aggregate()->accept( *this );
563	output << ".";
564	memberExpr->get_member()->accept( *this );
565	}
566
567	void CodeGenerator::visit( MemberExpr * memberExpr ) {
568	extension( memberExpr );
569	memberExpr->get_aggregate()->accept( *this );
570	output << "." << mangleName( memberExpr->get_member() );
571	}
572
573	void CodeGenerator::visit( VariableExpr * variableExpr ) {
574	extension( variableExpr );
575	OperatorInfo opInfo;
576	if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
577	output << opInfo.symbol;
578	} else {
579	output << mangleName( variableExpr->get_var() );
580	} // if
581	}
582
583	void CodeGenerator::visit( ConstantExpr * constantExpr ) {
584	assert( constantExpr->get_constant() );
585	extension( constantExpr );
586	constantExpr->get_constant()->accept( *this );
587	}
588
589	void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
590	extension( sizeofExpr );
591	output << "sizeof(";
592	if ( sizeofExpr->get_isType() ) {
593	output << genType( sizeofExpr->get_type(), "", pretty, genC );
594	} else {
595	sizeofExpr->get_expr()->accept( *this );
596	} // if
597	output << ")";
598	}
599
600	void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
601	// use GCC extension to avoid bumping std to C11
602	extension( alignofExpr );
603	output << "__alignof__(";
604	if ( alignofExpr->get_isType() ) {
605	output << genType( alignofExpr->get_type(), "", pretty, genC );
606	} else {
607	alignofExpr->get_expr()->accept( *this );
608	} // if
609	output << ")";
610	}
611
612	void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
613	assertf( ! genC, "UntypedOffsetofExpr should not reach code generation." );
614	output << "offsetof(";
615	output << genType( offsetofExpr->get_type(), "", pretty, genC );
616	output << ", " << offsetofExpr->get_member();
617	output << ")";
618	}
619
620	void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
621	// use GCC builtin
622	output << "__builtin_offsetof(";
623	output << genType( offsetofExpr->get_type(), "", pretty, genC );
624	output << ", " << mangleName( offsetofExpr->get_member() );
625	output << ")";
626	}
627
628	void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
629	assertf( ! genC, "OffsetPackExpr should not reach code generation." );
630	output << "__CFA_offsetpack(" << genType( offsetPackExpr->get_type(), "", pretty, genC ) << ")";
631	}
632
633	void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
634	extension( logicalExpr );
635	output << "(";
636	logicalExpr->get_arg1()->accept( *this );
637	if ( logicalExpr->get_isAnd() ) {
638	output << " && ";
639	} else {
640	output << " \|\| ";
641	} // if
642	logicalExpr->get_arg2()->accept( *this );
643	output << ")";
644	}
645
646	void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
647	extension( conditionalExpr );
648	output << "(";
649	conditionalExpr->get_arg1()->accept( *this );
650	output << " ? ";
651	conditionalExpr->get_arg2()->accept( *this );
652	output << " : ";
653	conditionalExpr->get_arg3()->accept( *this );
654	output << ")";
655	}
656
657	void CodeGenerator::visit( CommaExpr * commaExpr ) {
658	extension( commaExpr );
659	output << "(";
660	commaExpr->get_arg1()->accept( *this );
661	output << " , ";
662	commaExpr->get_arg2()->accept( *this );
663	output << ")";
664	}
665
666	void CodeGenerator::visit( UntypedTupleExpr * tupleExpr ) {
667	assertf( ! genC, "UntypedTupleExpr should not reach code generation." );
668	extension( tupleExpr );
669	output << "[";
670	genCommaList( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end() );
671	output << "]";
672	}
673
674	void CodeGenerator::visit( TupleExpr * tupleExpr ) {
675	assertf( ! genC, "TupleExpr should not reach code generation." );
676	extension( tupleExpr );
677	output << "[";
678	genCommaList( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end() );
679	output << "]";
680	}
681
682	void CodeGenerator::visit( TupleIndexExpr * tupleExpr ) {
683	assertf( ! genC, "TupleIndexExpr should not reach code generation." );
684	extension( tupleExpr );
685	tupleExpr->get_tuple()->accept( *this );
686	output << "." << tupleExpr->get_index();
687	}
688
689	void CodeGenerator::visit( TypeExpr * typeExpr ) {
690	// if ( genC ) std::cerr << "typeexpr still exists: " << typeExpr << std::endl;
691	// assertf( ! genC, "TypeExpr should not reach code generation." );
692	if ( ! genC ) {
693	output<< genType( typeExpr->get_type(), "", pretty, genC );
694	}
695	}
696
697	void CodeGenerator::visit( AsmExpr * asmExpr ) {
698	if ( asmExpr->get_inout() ) {
699	output << "[ ";
700	asmExpr->get_inout()->accept( *this );
701	output << " ] ";
702	} // if
703	asmExpr->get_constraint()->accept( *this );
704	output << " ( ";
705	asmExpr->get_operand()->accept( *this );
706	output << " )";
707	}
708
709	void CodeGenerator::visit( CompoundLiteralExpr *compLitExpr ) {
710	assert( compLitExpr->get_result() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
711	output << "(" << genType( compLitExpr->get_result(), "", pretty, genC ) << ")";
712	compLitExpr->get_initializer()->accept( *this );
713	}
714
715	void CodeGenerator::visit( StmtExpr * stmtExpr ) {
716	std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
717	output << lineDirective( stmtExpr) << "({" << std::endl;
718	++indent;
719	unsigned int numStmts = stmts.size();
720	unsigned int i = 0;
721	for ( Statement * stmt : stmts ) {
722	output << lineDirective( stmt ) << indent;
723	output << printLabels( stmt->get_labels() );
724	if ( i+1 == numStmts ) {
725	// last statement in a statement expression needs to be handled specially -
726	// cannot cast to void, otherwise the expression statement has no value
727	if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
728	exprStmt->get_expr()->accept( *this );
729	output << ";" << endl;
730	++i;
731	break;
732	}
733	}
734	stmt->accept( *this );
735	output << endl;
736	if ( wantSpacing( stmt ) ) {
737	output << endl;
738	} // if
739	++i;
740	}
741	--indent;
742	output << indent << "})";
743	}
744
745	// *** Statements
746	void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
747	std::list<Statement*> ks = compoundStmt->get_kids();
748	output << "{" << endl;
749
750	++indent;
751
752	for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
753	output << indent << printLabels( (*i)->get_labels() );
754	(i)->accept( this );
755
756	output << endl;
757	if ( wantSpacing( *i ) ) {
758	output << endl;
759	} // if
760	} // for
761	--indent;
762
763	output << indent << "}";
764	}
765
766	void CodeGenerator::visit( ExprStmt * exprStmt ) {
767	assert( exprStmt );
768	Expression * expr = exprStmt->get_expr();
769	if ( genC ) {
770	// cast the top-level expression to void to reduce gcc warnings.
771	expr = new CastExpr( expr );
772	}
773	expr->accept( *this );
774	output << ";";
775	}
776
777	void CodeGenerator::visit( AsmStmt * asmStmt ) {
778	output << "asm ";
779	if ( asmStmt->get_voltile() ) output << "volatile ";
780	if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
781	output << "( ";
782	if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
783	output << " : ";
784	genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
785	output << " : ";
786	genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
787	output << " : ";
788	genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
789	if ( ! asmStmt->get_gotolabels().empty() ) {
790	output << " : ";
791	for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
792	output << *begin++;
793	if ( begin == asmStmt->get_gotolabels().end() ) break;
794	output << ", ";
795	} // for
796	} // if
797	output << " );" ;
798	}
799
800	void CodeGenerator::visit( AsmDecl * asmDecl ) {
801	output << "asm ";
802	AsmStmt * asmStmt = asmDecl->get_stmt();
803	output << "( ";
804	if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
805	output << " )" ;
806	}
807
808	void CodeGenerator::visit( IfStmt * ifStmt ) {
809	output << lineDirective( ifStmt );
810	output << "if ( ";
811	ifStmt->get_condition()->accept( *this );
812	output << " ) ";
813
814	ifStmt->get_thenPart()->accept( *this );
815
816	if ( ifStmt->get_elsePart() != 0) {
817	output << " else ";
818	ifStmt->get_elsePart()->accept( *this );
819	} // if
820	}
821
822	void CodeGenerator::visit( SwitchStmt * switchStmt ) {
823	output << lineDirective( switchStmt );
824	output << "switch ( " ;
825	switchStmt->get_condition()->accept( *this );
826	output << " ) ";
827
828	output << "{" << std::endl;
829	++indent;
830	acceptAll( switchStmt->get_statements(), *this );
831	--indent;
832	output << indent << "}";
833	}
834
835	void CodeGenerator::visit( CaseStmt * caseStmt ) {
836	output << lineDirective( caseStmt );
837	output << indent;
838	if ( caseStmt->isDefault()) {
839	output << "default";
840	} else {
841	output << "case ";
842	caseStmt->get_condition()->accept( *this );
843	} // if
844	output << ":\n";
845
846	std::list<Statement *> sts = caseStmt->get_statements();
847
848	++indent;
849	for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
850	output << indent << printLabels( (*i)->get_labels() ) ;
851	(i)->accept( this );
852	output << endl;
853	} // for
854	--indent;
855	}
856
857	void CodeGenerator::visit( BranchStmt * branchStmt ) {
858	switch ( branchStmt->get_type()) {
859	case BranchStmt::Goto:
860	if ( ! branchStmt->get_target().empty() )
861	output << "goto " << branchStmt->get_target();
862	else {
863	if ( branchStmt->get_computedTarget() != 0 ) {
864	output << "goto *";
865	branchStmt->get_computedTarget()->accept( *this );
866	} // if
867	} // if
868	break;
869	case BranchStmt::Break:
870	output << "break";
871	break;
872	case BranchStmt::Continue:
873	output << "continue";
874	break;
875	} // switch
876	output << ";";
877	}
878
879	void CodeGenerator::visit( ReturnStmt * returnStmt ) {
880	output << "return ";
881	maybeAccept( returnStmt->get_expr(), *this );
882	output << ";";
883	}
884
885	void CodeGenerator::visit( ThrowStmt * throwStmt ) {
886	assertf( ! genC, "Throw statements should not reach code generation." );
887
888	output << ((throwStmt->get_kind() == ThrowStmt::Terminate) ?
889	"throw" : "throwResume");
890	if (throwStmt->get_expr()) {
891	output << " ";
892	throwStmt->get_expr()->accept( *this );
893	}
894	if (throwStmt->get_target()) {
895	output << " _At ";
896	throwStmt->get_target()->accept( *this );
897	}
898	output << ";";
899	}
900
901	void CodeGenerator::visit( WhileStmt * whileStmt ) {
902	if ( whileStmt->get_isDoWhile() ) {
903	output << "do" ;
904	} else {
905	output << "while (" ;
906	whileStmt->get_condition()->accept( *this );
907	output << ")";
908	} // if
909	output << " ";
910
911	output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
912	whileStmt->get_body()->accept( *this );
913
914	output << indent;
915
916	if ( whileStmt->get_isDoWhile() ) {
917	output << " while (" ;
918	whileStmt->get_condition()->accept( *this );
919	output << ");";
920	} // if
921	}
922
923	void CodeGenerator::visit( ForStmt * forStmt ) {
924	// initialization is always hoisted, so don't bother doing anything with that
925	output << "for (;";
926
927	if ( forStmt->get_condition() != 0 ) {
928	forStmt->get_condition()->accept( *this );
929	} // if
930	output << ";";
931
932	if ( forStmt->get_increment() != 0 ) {
933	// cast the top-level expression to void to reduce gcc warnings.
934	Expression * expr = new CastExpr( forStmt->get_increment() );
935	expr->accept( *this );
936	} // if
937	output << ") ";
938
939	if ( forStmt->get_body() != 0 ) {
940	output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
941	forStmt->get_body()->accept( *this );
942	} // if
943	}
944
945	void CodeGenerator::visit( __attribute__((unused)) NullStmt * nullStmt ) {
946	//output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
947	output << "/* null statement */ ;";
948	}
949
950	void CodeGenerator::visit( DeclStmt * declStmt ) {
951	declStmt->get_decl()->accept( *this );
952
953	if ( doSemicolon( declStmt->get_decl() ) ) {
954	output << ";";
955	} // if
956	}
957
958	void CodeGenerator::handleStorageClass( DeclarationWithType * decl ) {
959	if ( decl->get_storageClasses().any() ) {
960	decl->get_storageClasses().print( output );
961	} // if
962	} // CodeGenerator::handleStorageClass
963
964	std::string genName( DeclarationWithType * decl ) {
965	CodeGen::OperatorInfo opInfo;
966	if ( operatorLookup( decl->get_name(), opInfo ) ) {
967	return opInfo.outputName;
968	} else {
969	return decl->get_name();
970	} // if
971	}
972	} // namespace CodeGen
973
974	// Local Variables: //
975	// tab-width: 4 //
976	// mode: c++ //
977	// compile-command: "make install" //
978	// End: //

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