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source: src/CodeGen/CodeGenerator.cc @ ad56482

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 ad56482 was 44a81853, checked in by Peter A. Buhr <pabuhr@…>, 8 years ago
first attempt at gcc attributes
Property mode set to `100644`
File size: 27.8 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 : Wed Jan 18 15:23:08 2017
13	// Update Count : 414
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 mangle ) : indent( this), cur_indent( 0 ), insideFunction( false ), output( os ), printLabels( this ), mangle( mangle ) {}
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 ( ! mangle ) 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	if ( functionDecl->get_isInline() ) {
137	output << "inline ";
138	} // if
139	if ( functionDecl->get_isNoreturn() ) {
140	output << "_Noreturn ";
141	} // if
142	output << genType( functionDecl->get_functionType(), mangleName( functionDecl ) );
143
144	// how to get this to the Functype?
145	std::list< Declaration * > olds = functionDecl->get_oldDecls();
146	if ( ! olds.empty() ) {
147	output << " /* function has old declaration */";
148	} // if
149
150	asmName( functionDecl );
151
152	// acceptAll( functionDecl->get_oldDecls(), *this );
153	if ( functionDecl->get_statements() ) {
154	functionDecl->get_statements()->accept( *this );
155	} // if
156	}
157
158	void CodeGenerator::visit( ObjectDecl * objectDecl ) {
159	extension( objectDecl );
160	genAttributes( objectDecl->get_attributes() );
161
162	handleStorageClass( objectDecl );
163	output << genType( objectDecl->get_type(), mangleName( objectDecl ) );
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 ) {
179	if ( aggDecl->get_name() != "" )
180	output << aggDecl->get_name();
181
182	// std::list< Declaration * > & memb = aggDecl->get_members();
183	// if ( ! memb.empty() ) {
184	if ( aggDecl->has_body() ) {
185	std::list< Declaration * > & memb = aggDecl->get_members();
186	output << " {" << endl;
187
188	cur_indent += CodeGenerator::tabsize;
189	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
190	output << indent;
191	(i)->accept( this );
192	output << ";" << endl;
193	} // for
194
195	cur_indent -= CodeGenerator::tabsize;
196
197	output << indent << "}";
198	} // if
199	}
200
201	void CodeGenerator::visit( StructDecl * structDecl ) {
202	extension( structDecl );
203	output << "struct ";
204	handleAggregate( structDecl );
205	}
206
207	void CodeGenerator::visit( UnionDecl * unionDecl ) {
208	extension( unionDecl );
209	output << "union ";
210	handleAggregate( unionDecl );
211	}
212
213	void CodeGenerator::visit( EnumDecl * enumDecl ) {
214	extension( enumDecl );
215	output << "enum ";
216
217	if ( enumDecl->get_name() != "" )
218	output << enumDecl->get_name();
219
220	std::list< Declaration* > &memb = enumDecl->get_members();
221
222	if ( ! memb.empty() ) {
223	output << " {" << endl;
224
225	cur_indent += CodeGenerator::tabsize;
226	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
227	ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
228	assert( obj );
229	output << indent << mangleName( obj );
230	if ( obj->get_init() ) {
231	output << " = ";
232	obj->get_init()->accept( *this );
233	} // if
234	output << "," << endl;
235	} // for
236
237	cur_indent -= CodeGenerator::tabsize;
238
239	output << indent << "}";
240	} // if
241	}
242
243	void CodeGenerator::visit( TraitDecl * traitDecl ) {}
244
245	void CodeGenerator::visit( TypedefDecl * typeDecl ) {
246	assert( false && "Typedefs are removed and substituted in earlier passes." );
247	//output << "typedef ";
248	//output << genType( typeDecl->get_base(), typeDecl->get_name() );
249	}
250
251	void CodeGenerator::visit( TypeDecl * typeDecl ) {
252	// really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
253	// still to be done
254	extension( typeDecl );
255	output << "extern unsigned long " << typeDecl->get_name();
256	if ( typeDecl->get_base() ) {
257	output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )";
258	} // if
259	}
260
261	void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
262	typedef std::list< Expression * > DesignatorList;
263	if ( designators.size() == 0 ) return;
264	for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
265	if ( dynamic_cast< NameExpr * >( *iter ) ) {
266	// if expression is a name, then initializing aggregate member
267	output << ".";
268	(iter)->accept( this );
269	} else {
270	// if not a simple name, it has to be a constant expression, i.e. an array designator
271	output << "[";
272	(iter)->accept( this );
273	output << "]";
274	} // if
275	} // for
276	output << " = ";
277	}
278
279	void CodeGenerator::visit( SingleInit * init ) {
280	printDesignators( init->get_designators() );
281	init->get_value()->accept( *this );
282	}
283
284	void CodeGenerator::visit( ListInit * init ) {
285	printDesignators( init->get_designators() );
286	output << "{ ";
287	if ( init->begin() == init->end() ) {
288	// illegal to leave initializer list empty for scalar initializers, but always legal to have 0
289	output << "0";
290	} else {
291	genCommaList( init->begin(), init->end() );
292	} // if
293	output << " }";
294	}
295
296	void CodeGenerator::visit( ConstructorInit * init ){
297	assertf( false, "ConstructorInit nodes should not make it to CodeGen." );
298	}
299
300	void CodeGenerator::visit( Constant * constant ) {
301	output << constant->get_value() ;
302	}
303
304	//*** Expressions
305	void CodeGenerator::visit( ApplicationExpr * applicationExpr ) {
306	extension( applicationExpr );
307	if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
308	OperatorInfo opInfo;
309	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
310	std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
311	switch ( opInfo.type ) {
312	case OT_PREFIXASSIGN:
313	case OT_POSTFIXASSIGN:
314	case OT_INFIXASSIGN:
315	case OT_CTOR:
316	case OT_DTOR:
317	{
318	assert( arg != applicationExpr->get_args().end() );
319	if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) {
320	// remove & from first assignment/ctor argument
321	*arg = addrExpr->get_arg();
322	} else {
323	// no address-of operator, so must be a pointer - add dereference
324	// NOTE: if the assertion starts to trigger, check that the application expr isn't being shared.
325	// Since its arguments are modified here, this assertion most commonly triggers when the application
326	// is visited multiple times.
327	UntypedExpr * newExpr = new UntypedExpr( new NameExpr( "*?" ) );
328	newExpr->get_args().push_back( *arg );
329	Type * type = InitTweak::getPointerBase( (*arg)->get_result() );
330	assertf( type, "First argument to a derefence must be a pointer. Ensure that expressions are not being shared." );
331	newExpr->set_result( type->clone() );
332	*arg = newExpr;
333	} // if
334	break;
335	}
336
337	default:
338	// do nothing
339	;
340	} // switch
341
342	switch ( opInfo.type ) {
343	case OT_INDEX:
344	assert( applicationExpr->get_args().size() == 2 );
345	(arg++)->accept( this );
346	output << "[";
347	(arg)->accept( this );
348	output << "]";
349	break;
350
351	case OT_CALL:
352	// there are no intrinsic definitions of the function call operator
353	assert( false );
354	break;
355
356	case OT_CTOR:
357	case OT_DTOR:
358	if ( applicationExpr->get_args().size() == 1 ) {
359	// the expression fed into a single parameter constructor or destructor may contain side
360	// effects, so must still output this expression
361	output << "(";
362	(arg++)->accept( this );
363	output << ") /* " << opInfo.inputName << " */";
364	} else if ( applicationExpr->get_args().size() == 2 ) {
365	// intrinsic two parameter constructors are essentially bitwise assignment
366	output << "(";
367	(arg++)->accept( this );
368	output << opInfo.symbol;
369	(arg)->accept( this );
370	output << ") /* " << opInfo.inputName << " */";
371	} else {
372	// no constructors with 0 or more than 2 parameters
373	assert( false );
374	} // if
375	break;
376
377	case OT_PREFIX:
378	case OT_PREFIXASSIGN:
379	assert( applicationExpr->get_args().size() == 1 );
380	output << "(";
381	output << opInfo.symbol;
382	(arg)->accept( this );
383	output << ")";
384	break;
385
386	case OT_POSTFIX:
387	case OT_POSTFIXASSIGN:
388	assert( applicationExpr->get_args().size() == 1 );
389	(arg)->accept( this );
390	output << opInfo.symbol;
391	break;
392
393
394	case OT_INFIX:
395	case OT_INFIXASSIGN:
396	assert( applicationExpr->get_args().size() == 2 );
397	output << "(";
398	(arg++)->accept( this );
399	output << opInfo.symbol;
400	(arg)->accept( this );
401	output << ")";
402	break;
403
404	case OT_CONSTANT:
405	case OT_LABELADDRESS:
406	// there are no intrinsic definitions of 0/1 or label addresses as functions
407	assert( false );
408	} // switch
409	} else {
410	varExpr->accept( *this );
411	output << "(";
412	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
413	output << ")";
414	} // if
415	} else {
416	applicationExpr->get_function()->accept( *this );
417	output << "(";
418	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
419	output << ")";
420	} // if
421	}
422
423	void CodeGenerator::visit( UntypedExpr * untypedExpr ) {
424	extension( untypedExpr );
425	if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
426	OperatorInfo opInfo;
427	if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
428	std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
429	switch ( opInfo.type ) {
430	case OT_INDEX:
431	assert( untypedExpr->get_args().size() == 2 );
432	(arg++)->accept( this );
433	output << "[";
434	(arg)->accept( this );
435	output << "]";
436	break;
437
438	case OT_CALL:
439	assert( false );
440
441	case OT_CTOR:
442	case OT_DTOR:
443	if ( untypedExpr->get_args().size() == 1 ) {
444	// the expression fed into a single parameter constructor or destructor may contain side
445	// effects, so must still output this expression
446	output << "(";
447	(arg++)->accept( this );
448	output << ") /* " << opInfo.inputName << " */";
449	} else if ( untypedExpr->get_args().size() == 2 ) {
450	// intrinsic two parameter constructors are essentially bitwise assignment
451	output << "(";
452	(arg++)->accept( this );
453	output << opInfo.symbol;
454	(arg)->accept( this );
455	output << ") /* " << opInfo.inputName << " */";
456	} else {
457	// no constructors with 0 or more than 2 parameters
458	assert( false );
459	} // if
460	break;
461
462	case OT_PREFIX:
463	case OT_PREFIXASSIGN:
464	case OT_LABELADDRESS:
465	assert( untypedExpr->get_args().size() == 1 );
466	output << "(";
467	output << opInfo.symbol;
468	(arg)->accept( this );
469	output << ")";
470	break;
471
472	case OT_POSTFIX:
473	case OT_POSTFIXASSIGN:
474	assert( untypedExpr->get_args().size() == 1 );
475	(arg)->accept( this );
476	output << opInfo.symbol;
477	break;
478
479	case OT_INFIX:
480	case OT_INFIXASSIGN:
481	assert( untypedExpr->get_args().size() == 2 );
482	output << "(";
483	(arg++)->accept( this );
484	output << opInfo.symbol;
485	(arg)->accept( this );
486	output << ")";
487	break;
488
489	case OT_CONSTANT:
490	// there are no intrinsic definitions of 0 or 1 as functions
491	assert( false );
492	} // switch
493	} else {
494	if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
495	assert( untypedExpr->get_args().size() == 2 );
496	(untypedExpr->get_args().begin())->accept( this );
497	output << " ... ";
498	(--untypedExpr->get_args().end())->accept( this );
499	} else { // builtin routines
500	nameExpr->accept( *this );
501	output << "(";
502	genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
503	output << ")";
504	} // if
505	} // if
506	} else {
507	untypedExpr->get_function()->accept( *this );
508	output << "(";
509	genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
510	output << ")";
511	} // if
512	}
513
514	void CodeGenerator::visit( RangeExpr * rangeExpr ) {
515	rangeExpr->get_low()->accept( *this );
516	output << " ... ";
517	rangeExpr->get_high()->accept( *this );
518	}
519
520	void CodeGenerator::visit( NameExpr * nameExpr ) {
521	extension( nameExpr );
522	OperatorInfo opInfo;
523	if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
524	assert( opInfo.type == OT_CONSTANT );
525	output << opInfo.symbol;
526	} else {
527	output << nameExpr->get_name();
528	} // if
529	}
530
531	void CodeGenerator::visit( AddressExpr * addressExpr ) {
532	extension( addressExpr );
533	output << "(&";
534	// this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
535	if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
536	output << mangleName( variableExpr->get_var() );
537	} else {
538	addressExpr->get_arg()->accept( *this );
539	} // if
540	output << ")";
541	}
542
543	void CodeGenerator::visit( CastExpr * castExpr ) {
544	extension( castExpr );
545	output << "(";
546	if ( castExpr->get_result()->isVoid() ) {
547	output << "(void)" ;
548	} else if ( ! castExpr->get_result()->get_isLvalue() ) {
549	// at least one result type of cast, but not an lvalue
550	output << "(";
551	output << genType( castExpr->get_result(), "" );
552	output << ")";
553	} else {
554	// otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
555	// never an lvalue in C
556	} // if
557	castExpr->get_arg()->accept( *this );
558	output << ")";
559	}
560
561	void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) {
562	assert( false );
563	}
564
565	void CodeGenerator::visit( MemberExpr * memberExpr ) {
566	extension( memberExpr );
567	memberExpr->get_aggregate()->accept( *this );
568	output << "." << mangleName( memberExpr->get_member() );
569	}
570
571	void CodeGenerator::visit( VariableExpr * variableExpr ) {
572	extension( variableExpr );
573	OperatorInfo opInfo;
574	if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
575	output << opInfo.symbol;
576	} else {
577	output << mangleName( variableExpr->get_var() );
578	} // if
579	}
580
581	void CodeGenerator::visit( ConstantExpr * constantExpr ) {
582	assert( constantExpr->get_constant() );
583	extension( constantExpr );
584	constantExpr->get_constant()->accept( *this );
585	}
586
587	void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
588	extension( sizeofExpr );
589	output << "sizeof(";
590	if ( sizeofExpr->get_isType() ) {
591	output << genType( sizeofExpr->get_type(), "" );
592	} else {
593	sizeofExpr->get_expr()->accept( *this );
594	} // if
595	output << ")";
596	}
597
598	void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
599	// use GCC extension to avoid bumping std to C11
600	extension( alignofExpr );
601	output << "__alignof__(";
602	if ( alignofExpr->get_isType() ) {
603	output << genType( alignofExpr->get_type(), "" );
604	} else {
605	alignofExpr->get_expr()->accept( *this );
606	} // if
607	output << ")";
608	}
609
610	void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
611	assert( false && "UntypedOffsetofExpr should not reach code generation." );
612	}
613
614	void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
615	// use GCC builtin
616	output << "__builtin_offsetof(";
617	output << genType( offsetofExpr->get_type(), "" );
618	output << ", " << mangleName( offsetofExpr->get_member() );
619	output << ")";
620	}
621
622	void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
623	assert( false && "OffsetPackExpr should not reach code generation." );
624	}
625
626	void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
627	extension( logicalExpr );
628	output << "(";
629	logicalExpr->get_arg1()->accept( *this );
630	if ( logicalExpr->get_isAnd() ) {
631	output << " && ";
632	} else {
633	output << " \|\| ";
634	} // if
635	logicalExpr->get_arg2()->accept( *this );
636	output << ")";
637	}
638
639	void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
640	extension( conditionalExpr );
641	output << "(";
642	conditionalExpr->get_arg1()->accept( *this );
643	output << " ? ";
644	conditionalExpr->get_arg2()->accept( *this );
645	output << " : ";
646	conditionalExpr->get_arg3()->accept( *this );
647	output << ")";
648	}
649
650	void CodeGenerator::visit( CommaExpr * commaExpr ) {
651	extension( commaExpr );
652	output << "(";
653	commaExpr->get_arg1()->accept( *this );
654	output << " , ";
655	commaExpr->get_arg2()->accept( *this );
656	output << ")";
657	}
658
659	void CodeGenerator::visit( UntypedTupleExpr * tupleExpr ) { assertf( false, "UntypedTupleExpr should not make it to Code Gen" ); }
660
661	void CodeGenerator::visit( TupleExpr * tupleExpr ) { assertf( false, "TupleExpr should not make it to Code Gen" ); }
662
663	void CodeGenerator::visit( TypeExpr * typeExpr ) {}
664
665	void CodeGenerator::visit( AsmExpr * asmExpr ) {
666	if ( asmExpr->get_inout() ) {
667	output << "[ ";
668	asmExpr->get_inout()->accept( *this );
669	output << " ] ";
670	} // if
671	asmExpr->get_constraint()->accept( *this );
672	output << " ( ";
673	asmExpr->get_operand()->accept( *this );
674	output << " )";
675	}
676
677	void CodeGenerator::visit( CompoundLiteralExpr *compLitExpr ) {
678	assert( compLitExpr->get_type() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
679	output << "(" << genType( compLitExpr->get_type(), "" ) << ")";
680	compLitExpr->get_initializer()->accept( *this );
681	}
682
683	void CodeGenerator::visit( StmtExpr * stmtExpr ) {
684	std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
685	output << "({" << std::endl;
686	cur_indent += CodeGenerator::tabsize;
687	unsigned int numStmts = stmts.size();
688	unsigned int i = 0;
689	for ( Statement * stmt : stmts ) {
690	output << indent << printLabels( stmt->get_labels() );
691	if ( i+1 == numStmts ) {
692	// last statement in a statement expression needs to be handled specially -
693	// cannot cast to void, otherwise the expression statement has no value
694	if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
695	exprStmt->get_expr()->accept( *this );
696	output << ";" << endl;
697	++i;
698	break;
699	}
700	}
701	stmt->accept( *this );
702	output << endl;
703	if ( wantSpacing( stmt ) ) {
704	output << endl;
705	} // if
706	++i;
707	}
708	cur_indent -= CodeGenerator::tabsize;
709	output << indent << "})";
710	}
711
712	//*** Statements
713	void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
714	std::list<Statement*> ks = compoundStmt->get_kids();
715	output << "{" << endl;
716
717	cur_indent += CodeGenerator::tabsize;
718
719	for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
720	output << indent << printLabels( (*i)->get_labels() );
721	(i)->accept( this );
722
723	output << endl;
724	if ( wantSpacing( *i ) ) {
725	output << endl;
726	} // if
727	} // for
728	cur_indent -= CodeGenerator::tabsize;
729
730	output << indent << "}";
731	}
732
733	void CodeGenerator::visit( ExprStmt * exprStmt ) {
734	assert( exprStmt );
735	// cast the top-level expression to void to reduce gcc warnings.
736	Expression * expr = new CastExpr( exprStmt->get_expr() );
737	expr->accept( *this );
738	output << ";";
739	}
740
741	void CodeGenerator::visit( AsmStmt * asmStmt ) {
742	output << "asm ";
743	if ( asmStmt->get_voltile() ) output << "volatile ";
744	if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
745	output << "( ";
746	if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
747	output << " : ";
748	genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
749	output << " : ";
750	genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
751	output << " : ";
752	genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
753	if ( ! asmStmt->get_gotolabels().empty() ) {
754	output << " : ";
755	for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
756	output << *begin++;
757	if ( begin == asmStmt->get_gotolabels().end() ) break;
758	output << ", ";
759	} // for
760	} // if
761	output << " );" ;
762	}
763
764	void CodeGenerator::visit( IfStmt * ifStmt ) {
765	output << "if ( ";
766	ifStmt->get_condition()->accept( *this );
767	output << " ) ";
768
769	ifStmt->get_thenPart()->accept( *this );
770
771	if ( ifStmt->get_elsePart() != 0) {
772	output << " else ";
773	ifStmt->get_elsePart()->accept( *this );
774	} // if
775	}
776
777	void CodeGenerator::visit( SwitchStmt * switchStmt ) {
778	output << "switch ( " ;
779	switchStmt->get_condition()->accept( *this );
780	output << " ) ";
781
782	output << "{" << std::endl;
783	cur_indent += CodeGenerator::tabsize;
784	acceptAll( switchStmt->get_statements(), *this );
785	cur_indent -= CodeGenerator::tabsize;
786	output << indent << "}";
787	}
788
789	void CodeGenerator::visit( CaseStmt * caseStmt ) {
790	output << indent;
791	if ( caseStmt->isDefault()) {
792	output << "default";
793	} else {
794	output << "case ";
795	caseStmt->get_condition()->accept( *this );
796	} // if
797	output << ":\n";
798
799	std::list<Statement *> sts = caseStmt->get_statements();
800
801	cur_indent += CodeGenerator::tabsize;
802	for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
803	output << indent << printLabels( (*i)->get_labels() ) ;
804	(i)->accept( this );
805	output << endl;
806	} // for
807	cur_indent -= CodeGenerator::tabsize;
808	}
809
810	void CodeGenerator::visit( BranchStmt * branchStmt ) {
811	switch ( branchStmt->get_type()) {
812	case BranchStmt::Goto:
813	if ( ! branchStmt->get_target().empty() )
814	output << "goto " << branchStmt->get_target();
815	else {
816	if ( branchStmt->get_computedTarget() != 0 ) {
817	output << "goto *";
818	branchStmt->get_computedTarget()->accept( *this );
819	} // if
820	} // if
821	break;
822	case BranchStmt::Break:
823	output << "break";
824	break;
825	case BranchStmt::Continue:
826	output << "continue";
827	break;
828	} // switch
829	output << ";";
830	}
831
832
833	void CodeGenerator::visit( ReturnStmt * returnStmt ) {
834	output << "return ";
835	maybeAccept( returnStmt->get_expr(), *this );
836	output << ";";
837	}
838
839	void CodeGenerator::visit( WhileStmt * whileStmt ) {
840	if ( whileStmt->get_isDoWhile() ) {
841	output << "do" ;
842	} else {
843	output << "while (" ;
844	whileStmt->get_condition()->accept( *this );
845	output << ")";
846	} // if
847	output << " ";
848
849	output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
850	whileStmt->get_body()->accept( *this );
851
852	output << indent;
853
854	if ( whileStmt->get_isDoWhile() ) {
855	output << " while (" ;
856	whileStmt->get_condition()->accept( *this );
857	output << ");";
858	} // if
859	}
860
861	void CodeGenerator::visit( ForStmt * forStmt ) {
862	// initialization is always hoisted, so don't bother doing anything with that
863	output << "for (;";
864
865	if ( forStmt->get_condition() != 0 ) {
866	forStmt->get_condition()->accept( *this );
867	} // if
868	output << ";";
869
870	if ( forStmt->get_increment() != 0 ) {
871	// cast the top-level expression to void to reduce gcc warnings.
872	Expression * expr = new CastExpr( forStmt->get_increment() );
873	expr->accept( *this );
874	} // if
875	output << ") ";
876
877	if ( forStmt->get_body() != 0 ) {
878	output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
879	forStmt->get_body()->accept( *this );
880	} // if
881	}
882
883	void CodeGenerator::visit( NullStmt * nullStmt ) {
884	//output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
885	output << "/* null statement */ ;";
886	}
887
888	void CodeGenerator::visit( DeclStmt * declStmt ) {
889	declStmt->get_decl()->accept( *this );
890
891	if ( doSemicolon( declStmt->get_decl() ) ) {
892	output << ";";
893	} // if
894	}
895
896	void CodeGenerator::handleStorageClass( Declaration * decl ) {
897	switch ( decl->get_storageClass() ) {
898	case DeclarationNode::Extern:
899	output << "extern ";
900	break;
901	case DeclarationNode::Static:
902	output << "static ";
903	break;
904	case DeclarationNode::Auto:
905	// silently drop storage class
906	break;
907	case DeclarationNode::Register:
908	output << "register ";
909	break;
910	case DeclarationNode::Inline:
911	output << "inline ";
912	break;
913	case DeclarationNode::Fortran:
914	output << "fortran ";
915	break;
916	case DeclarationNode::Noreturn:
917	output << "_Noreturn ";
918	break;
919	case DeclarationNode::Threadlocal:
920	output << "_Thread_local ";
921	break;
922	case DeclarationNode::NoStorageClass:
923	break;
924	} // switch
925	}
926
927	std::string genName( DeclarationWithType * decl ) {
928	CodeGen::OperatorInfo opInfo;
929	if ( operatorLookup( decl->get_name(), opInfo ) ) {
930	return opInfo.outputName;
931	} else {
932	return decl->get_name();
933	} // if
934	}
935	} // namespace CodeGen
936
937	// Local Variables: //
938	// tab-width: 4 //
939	// mode: c++ //
940	// compile-command: "make install" //
941	// End: //

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