source: src/CodeGen/CodeGenerator.cc@ b70abaf

ADT ast-experimental pthread-emulation qualifiedEnum
Last change on this file since b70abaf was b99fd56, checked in by Thierry Delisle <tdelisle@…>, 3 years ago

CodeGeneration now generates variable exprs of type zero_t as litteral 0s.
  • Property mode set to 100644
File size: 39.2 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 : Wed Feb 2 20:30:30 2022
13// Update Count : 541
14//
15#include "CodeGenerator.h"
16
17#include <cassert> // for assert, assertf
18#include <list> // for _List_iterator, list, list<>::it...
19
20#include "Common/UniqueName.h" // for UniqueName
21#include "Common/utility.h" // for CodeLocation, toString
22#include "GenType.h" // for genType
23#include "InitTweak/InitTweak.h" // for getPointerBase
24#include "OperatorTable.h" // for OperatorInfo, operatorLookup
25#include "SynTree/LinkageSpec.h" // for Spec, Intrinsic
26#include "SynTree/Attribute.h" // for Attribute
27#include "SynTree/BaseSyntaxNode.h" // for BaseSyntaxNode
28#include "SynTree/Constant.h" // for Constant
29#include "SynTree/Declaration.h" // for DeclarationWithType, TypeDecl
30#include "SynTree/Expression.h" // for Expression, UntypedExpr, Applica...
31#include "SynTree/Initializer.h" // for Initializer, ListInit, Designation
32#include "SynTree/Label.h" // for Label, operator<<
33#include "SynTree/Statement.h" // for Statement, AsmStmt, BranchStmt
34#include "SynTree/Type.h" // for Type, Type::StorageClasses, Func...
35
36using namespace std;
37
38namespace 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< WhileDoStmt * >( stmt ) || dynamic_cast< ForStmt * >( stmt ) || dynamic_cast< SwitchStmt *>( stmt );
45 }
46
47 void CodeGenerator::extension( Expression * expr ) {
48 if ( expr->get_extension() ) {
49 output << "__extension__ ";
50 } // if
51 } // extension
52
53 void CodeGenerator::extension( Declaration * decl ) {
54 if ( decl->get_extension() ) {
55 output << "__extension__ ";
56 } // if
57 } // extension
58
59 void CodeGenerator::asmName( DeclarationWithType * decl ) {
60 if ( ConstantExpr * asmName = dynamic_cast<ConstantExpr *>(decl->get_asmName()) ) {
61 output << " asm ( " << asmName->get_constant()->get_value() << " )";
62 } // if
63 } // extension
64
65 CodeGenerator::LabelPrinter & CodeGenerator::LabelPrinter::operator()( std::list< Label > & l ) {
66 labels = &l;
67 return *this;
68 }
69
70 ostream & operator<<( ostream & output, CodeGenerator::LabelPrinter & printLabels ) {
71 std::list< Label > & labs = *printLabels.labels;
72 // l.unique(); // assumes a sorted list. Why not use set? Does order matter?
73 for ( Label & l : labs ) {
74 output << l.get_name() + ": ";
75 printLabels.cg.genAttributes( l.get_attributes() );
76 } // for
77 return output;
78 }
79
80 // Using updateLocation at the beginning of a node and endl within a node should become the method of formating.
81 void CodeGenerator::updateLocation( CodeLocation const & to ) {
82 // skip if linemarks shouldn't appear or if codelocation is unset
83 if ( !options.lineMarks || to.isUnset() ) return;
84
85 if ( currentLocation.followedBy( to, 0 ) ) {
86 return;
87 } else if ( currentLocation.followedBy( to, 1 ) ) {
88 output << "\n" << indent;
89 currentLocation.first_line += 1;
90 } else if ( currentLocation.followedBy( to, 2 ) ) {
91 output << "\n\n" << indent;
92 currentLocation.first_line += 2;
93 } else {
94 output << "\n# " << to.first_line << " \"" << to.filename
95 << "\"\n" << indent;
96 currentLocation = to;
97 }
98 output << std::flush;
99 }
100
101 void CodeGenerator::updateLocation( BaseSyntaxNode const * to ) {
102 updateLocation( to->location );
103 }
104
105 // replace endl
106 ostream & CodeGenerator::LineEnder::operator()( ostream & os ) const {
107 // if ( !cg.lineMarks ) {
108 // os << "\n" << cg.indent << std::flush;
109 // }
110 os << "\n" << std::flush;
111 cg.currentLocation.first_line++;
112 // os << "/* did endl; current loc is: " << cg.currentLocation.first_line << "*/";
113 return os;
114 }
115
116 CodeGenerator::CodeGenerator( std::ostream & os, bool pretty, bool genC, bool lineMarks, bool printExprTypes ) : indent( 0, CodeGenerator::tabsize ), output( os ), printLabels( *this ), options( pretty, genC, lineMarks, printExprTypes ), endl( *this ) {}
117 CodeGenerator::CodeGenerator( std::ostream & os, const Options &options ) : indent( 0, CodeGenerator::tabsize ), output( os ), printLabels( *this ), options(options), endl( *this ) {}
118
119 string CodeGenerator::mangleName( DeclarationWithType * decl ) {
120 // GCC builtins should always be printed unmangled
121 if ( options.pretty || decl->linkage.is_gcc_builtin ) return decl->name;
122 if ( LinkageSpec::isMangled(decl->linkage) && decl->mangleName != "" ) {
123 // need to incorporate scope level in order to differentiate names for destructors
124 return decl->get_scopedMangleName();
125 } else {
126 return decl->name;
127 } // if
128 }
129
130 void CodeGenerator::genAttributes( list< Attribute * > & attributes ) {
131 if ( attributes.empty() ) return;
132 output << "__attribute__ ((";
133 for ( list< Attribute * >::iterator attr( attributes.begin() );; ) {
134 output << (*attr)->name;
135 if ( ! (*attr)->parameters.empty() ) {
136 output << "(";
137 genCommaList( (*attr)->parameters.begin(), (*attr)->parameters.end() );
138 output << ")";
139 } // if
140 if ( ++attr == attributes.end() ) break;
141 output << ","; // separator
142 } // for
143 output << ")) ";
144 } // CodeGenerator::genAttributes
145
146 // *** BaseSyntaxNode
147 void CodeGenerator::previsit( BaseSyntaxNode * node ) {
148 // turn off automatic recursion for all nodes, to allow each visitor to
149 // precisely control the order in which its children are visited.
150 visit_children = false;
151 updateLocation( node );
152 }
153
154 // *** BaseSyntaxNode
155 void CodeGenerator::postvisit( BaseSyntaxNode * node ) {
156 std::stringstream ss;
157 node->print( ss );
158 assertf( false, "Unhandled node reached in CodeGenerator: %s", ss.str().c_str() );
159 }
160
161 // *** Expression
162 void CodeGenerator::previsit( Expression * node ) {
163 previsit( (BaseSyntaxNode *)node );
164 GuardAction( [this, node](){
165 if ( options.printExprTypes && node->result ) {
166 output << " /* " << genType( node->result, "", options ) << " */ ";
167 }
168 } );
169 }
170
171 // *** Declarations
172 void CodeGenerator::postvisit( FunctionDecl * functionDecl ) {
173 // deleted decls should never be used, so don't print them
174 if ( functionDecl->isDeleted && options.genC ) return;
175 extension( functionDecl );
176 genAttributes( functionDecl->get_attributes() );
177
178 handleStorageClass( functionDecl );
179 functionDecl->get_funcSpec().print( output );
180
181 Options subOptions = options;
182 subOptions.anonymousUnused = functionDecl->has_body();
183 output << genType( functionDecl->get_functionType(), mangleName( functionDecl ), subOptions );
184
185 asmName( functionDecl );
186
187 if ( functionDecl->get_statements() ) {
188 functionDecl->get_statements()->accept( *visitor );
189 } // if
190 if ( functionDecl->isDeleted ) {
191 output << " = void";
192 }
193 }
194
195 void CodeGenerator::postvisit( ObjectDecl * objectDecl ) {
196 // deleted decls should never be used, so don't print them
197 if ( objectDecl->isDeleted && options.genC ) return;
198
199 // gcc allows an empty declarator (no name) for bit-fields and C states: 6.7.2.1 Structure and union specifiers,
200 // point 4, page 113: If the (bit field) value is zero, the declaration shall have no declarator. For anything
201 // else, the anonymous name refers to the anonymous object for plan9 inheritance.
202 if ( objectDecl->get_name().empty() && options.genC && ! objectDecl->get_bitfieldWidth() ) {
203 // only generate an anonymous name when generating C code, otherwise it clutters the output too much
204 static UniqueName name = { "__anonymous_object" };
205 objectDecl->set_name( name.newName() );
206 // Stops unused parameter warnings.
207 if ( options.anonymousUnused ) {
208 objectDecl->attributes.push_back( new Attribute( "unused" ) );
209 }
210 }
211
212 extension( objectDecl );
213 genAttributes( objectDecl->get_attributes() );
214
215 handleStorageClass( objectDecl );
216 output << genType( objectDecl->get_type(), mangleName( objectDecl ), options.pretty, options.genC );
217
218 asmName( objectDecl );
219
220 if ( objectDecl->get_init() ) {
221 output << " = ";
222 objectDecl->get_init()->accept( *visitor );
223 } // if
224 if ( objectDecl->isDeleted ) {
225 output << " = void";
226 }
227
228 if ( objectDecl->get_bitfieldWidth() ) {
229 output << ":";
230 objectDecl->get_bitfieldWidth()->accept( *visitor );
231 } // if
232 }
233
234 void CodeGenerator::handleAggregate( AggregateDecl * aggDecl, const std::string & kind ) {
235 if( ! aggDecl->parameters.empty() && ! options.genC ) {
236 // assertf( ! genC, "Aggregate type parameters should not reach code generation." );
237 output << "forall(";
238 genCommaList( aggDecl->parameters.begin(), aggDecl->parameters.end() );
239 output << ")" << endl;
240 output << indent;
241 }
242
243 output << kind;
244 genAttributes( aggDecl->attributes );
245 output << aggDecl->name;
246
247 if ( aggDecl->has_body() ) {
248 std::list< Declaration * > & memb = aggDecl->members;
249 output << " {" << endl;
250
251 ++indent;
252 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
253 output << indent;
254 (*i)->accept( *visitor );
255 output << ";" << endl;
256 } // for
257
258 --indent;
259
260 output << indent << "}";
261 } // if
262 }
263
264 void CodeGenerator::postvisit( StructDecl * structDecl ) {
265 extension( structDecl );
266 handleAggregate( structDecl, "struct " );
267 }
268
269 void CodeGenerator::postvisit( UnionDecl * unionDecl ) {
270 extension( unionDecl );
271 handleAggregate( unionDecl, "union " );
272 }
273
274 void CodeGenerator::postvisit( EnumDecl * enumDecl ) {
275 extension( enumDecl );
276 std::list< Declaration* > &memb = enumDecl->get_members();
277 if (enumDecl->base && ! memb.empty()) {
278 unsigned long long last_val = -1;
279 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
280 ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
281 assert( obj );
282 output << "static const ";
283 output << genType(enumDecl->base, "", options) << " ";
284 output << mangleName( obj ) << " ";
285 output << " = ";
286 output << "(" << genType(enumDecl->base, "", options) << ")";
287 if ( (BasicType *)(enumDecl->base) && ((BasicType *)(enumDecl->base))->isWholeNumber() ) {
288 if ( obj->get_init() ) {
289 obj->get_init()->accept( *visitor );
290 last_val = ((ConstantExpr *)(((SingleInit *)(obj->init))->value))->constant.get_ival();
291 } else {
292 output << ++last_val;
293 } // if
294 } else {
295 if ( obj->get_init() ) {
296 obj->get_init()->accept( *visitor );
297 } else {
298 // Should not reach here!
299 }
300 }
301 output << ";" << endl;
302 } // for
303 } else {
304 output << "enum ";
305 genAttributes( enumDecl->get_attributes() );
306
307 output << enumDecl->get_name();
308
309 if ( ! memb.empty() ) {
310 output << " {" << endl;
311
312 ++indent;
313 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
314 ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
315 assert( obj );
316 output << indent << mangleName( obj );
317 if ( obj->get_init() ) {
318 output << " = ";
319 obj->get_init()->accept( *visitor );
320 } // if
321 output << "," << endl;
322 } // for
323 --indent;
324 output << indent << "}";
325 } // if
326 } // if
327 }
328
329 void CodeGenerator::postvisit( TraitDecl * traitDecl ) {
330 assertf( ! options.genC, "TraitDecls should not reach code generation." );
331 extension( traitDecl );
332 handleAggregate( traitDecl, "trait " );
333 }
334
335 void CodeGenerator::postvisit( TypedefDecl * typeDecl ) {
336 assertf( ! options.genC, "Typedefs are removed and substituted in earlier passes." );
337 output << "typedef ";
338 output << genType( typeDecl->get_base(), typeDecl->get_name(), options ) << endl;
339 }
340
341 void CodeGenerator::postvisit( TypeDecl * typeDecl ) {
342 assertf( ! options.genC, "TypeDecls should not reach code generation." );
343 output << typeDecl->genTypeString() << " " << typeDecl->name;
344 if ( typeDecl->sized ) {
345 output << " | sized(" << typeDecl->name << ")";
346 }
347 if ( ! typeDecl->assertions.empty() ) {
348 output << " | { ";
349 for ( DeclarationWithType * assert : typeDecl->assertions ) {
350 assert->accept( *visitor );
351 output << "; ";
352 }
353 output << " }";
354 }
355 }
356
357 void CodeGenerator::postvisit( StaticAssertDecl * assertDecl ) {
358 output << "_Static_assert(";
359 assertDecl->condition->accept( *visitor );
360 output << ", ";
361 assertDecl->message->accept( *visitor );
362 output << ")";
363 }
364
365 void CodeGenerator::postvisit( Designation * designation ) {
366 std::list< Expression * > designators = designation->get_designators();
367 if ( designators.size() == 0 ) return;
368 for ( Expression * des : designators ) {
369 if ( dynamic_cast< NameExpr * >( des ) || dynamic_cast< VariableExpr * >( des ) ) {
370 // if expression is a NameExpr or VariableExpr, then initializing aggregate member
371 output << ".";
372 des->accept( *visitor );
373 } else {
374 // otherwise, it has to be a ConstantExpr or CastExpr, initializing array element
375 output << "[";
376 des->accept( *visitor );
377 output << "]";
378 } // if
379 } // for
380 output << " = ";
381 }
382
383 void CodeGenerator::postvisit( SingleInit * init ) {
384 init->get_value()->accept( *visitor );
385 }
386
387 void CodeGenerator::postvisit( ListInit * init ) {
388 auto initBegin = init->begin();
389 auto initEnd = init->end();
390 auto desigBegin = init->get_designations().begin();
391 auto desigEnd = init->get_designations().end();
392
393 output << "{ ";
394 for ( ; initBegin != initEnd && desigBegin != desigEnd; ) {
395 (*desigBegin)->accept( *visitor );
396 (*initBegin)->accept( *visitor );
397 ++initBegin, ++desigBegin;
398 if ( initBegin != initEnd ) {
399 output << ", ";
400 }
401 }
402 output << " }";
403 assertf( initBegin == initEnd && desigBegin == desigEnd, "Initializers and designators not the same length. %s", toString( init ).c_str() );
404 }
405
406 void CodeGenerator::postvisit( ConstructorInit * init ){
407 assertf( ! options.genC, "ConstructorInit nodes should not reach code generation." );
408 // pseudo-output for constructor/destructor pairs
409 output << "<ctorinit>{" << endl << ++indent << "ctor: ";
410 maybeAccept( init->get_ctor(), *visitor );
411 output << ", " << endl << indent << "dtor: ";
412 maybeAccept( init->get_dtor(), *visitor );
413 output << endl << --indent << "}";
414 }
415
416 void CodeGenerator::postvisit( Constant * constant ) {
417 output << constant->get_value();
418 }
419
420 // *** Expressions
421 void CodeGenerator::postvisit( ApplicationExpr * applicationExpr ) {
422 extension( applicationExpr );
423 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
424 const OperatorInfo * opInfo;
425 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && ( opInfo = operatorLookup( varExpr->get_var()->get_name() ) ) ) {
426 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
427 switch ( opInfo->type ) {
428 case OT_INDEX:
429 assert( applicationExpr->get_args().size() == 2 );
430 (*arg++)->accept( *visitor );
431 output << "[";
432 (*arg)->accept( *visitor );
433 output << "]";
434 break;
435
436 case OT_CALL:
437 // there are no intrinsic definitions of the function call operator
438 assert( false );
439 break;
440
441 case OT_CTOR:
442 case OT_DTOR:
443 if ( applicationExpr->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( *visitor );
448 output << ") /* " << opInfo->inputName << " */";
449 } else if ( applicationExpr->get_args().size() == 2 ) {
450 // intrinsic two parameter constructors are essentially bitwise assignment
451 output << "(";
452 (*arg++)->accept( *visitor );
453 output << opInfo->symbol;
454 (*arg)->accept( *visitor );
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 assert( applicationExpr->get_args().size() == 1 );
465 output << "(";
466 output << opInfo->symbol;
467 (*arg)->accept( *visitor );
468 output << ")";
469 break;
470
471 case OT_POSTFIX:
472 case OT_POSTFIXASSIGN:
473 assert( applicationExpr->get_args().size() == 1 );
474 (*arg)->accept( *visitor );
475 output << opInfo->symbol;
476 break;
477
478
479 case OT_INFIX:
480 case OT_INFIXASSIGN:
481 assert( applicationExpr->get_args().size() == 2 );
482 output << "(";
483 (*arg++)->accept( *visitor );
484 output << opInfo->symbol;
485 (*arg)->accept( *visitor );
486 output << ")";
487 break;
488
489 case OT_CONSTANT:
490 case OT_LABELADDRESS:
491 // there are no intrinsic definitions of 0/1 or label addresses as functions
492 assert( false );
493 } // switch
494 } else {
495 varExpr->accept( *visitor );
496 output << "(";
497 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
498 output << ")";
499 } // if
500 } else {
501 applicationExpr->get_function()->accept( *visitor );
502 output << "(";
503 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
504 output << ")";
505 } // if
506 }
507
508 void CodeGenerator::postvisit( UntypedExpr * untypedExpr ) {
509 extension( untypedExpr );
510 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->function ) ) {
511 const OperatorInfo * opInfo = operatorLookup( nameExpr->name );
512 if ( opInfo ) {
513 std::list< Expression* >::iterator arg = untypedExpr->args.begin();
514 switch ( opInfo->type ) {
515 case OT_INDEX:
516 assert( untypedExpr->args.size() == 2 );
517 (*arg++)->accept( *visitor );
518 output << "[";
519 (*arg)->accept( *visitor );
520 output << "]";
521 break;
522
523 case OT_CALL:
524 assert( false );
525
526 case OT_CTOR:
527 case OT_DTOR:
528 if ( untypedExpr->args.size() == 1 ) {
529 // the expression fed into a single parameter constructor or destructor may contain side
530 // effects, so must still output this expression
531 output << "(";
532 (*arg++)->accept( *visitor );
533 output << ") /* " << opInfo->inputName << " */";
534 } else if ( untypedExpr->get_args().size() == 2 ) {
535 // intrinsic two parameter constructors are essentially bitwise assignment
536 output << "(";
537 (*arg++)->accept( *visitor );
538 output << opInfo->symbol;
539 (*arg)->accept( *visitor );
540 output << ") /* " << opInfo->inputName << " */";
541 } else {
542 // no constructors with 0 or more than 2 parameters
543 assertf( ! options.genC, "UntypedExpr constructor/destructor with 0 or more than 2 parameters." );
544 output << "(";
545 (*arg++)->accept( *visitor );
546 output << opInfo->symbol << "{ ";
547 genCommaList( arg, untypedExpr->args.end() );
548 output << "}) /* " << opInfo->inputName << " */";
549 } // if
550 break;
551
552 case OT_PREFIX:
553 case OT_PREFIXASSIGN:
554 case OT_LABELADDRESS:
555 assert( untypedExpr->args.size() == 1 );
556 output << "(";
557 output << opInfo->symbol;
558 (*arg)->accept( *visitor );
559 output << ")";
560 break;
561
562 case OT_POSTFIX:
563 case OT_POSTFIXASSIGN:
564 assert( untypedExpr->args.size() == 1 );
565 (*arg)->accept( *visitor );
566 output << opInfo->symbol;
567 break;
568
569 case OT_INFIX:
570 case OT_INFIXASSIGN:
571 assert( untypedExpr->args.size() == 2 );
572 output << "(";
573 (*arg++)->accept( *visitor );
574 output << opInfo->symbol;
575 (*arg)->accept( *visitor );
576 output << ")";
577 break;
578
579 case OT_CONSTANT:
580 // there are no intrinsic definitions of 0 or 1 as functions
581 assert( false );
582 } // switch
583 } else {
584 // builtin routines
585 nameExpr->accept( *visitor );
586 output << "(";
587 genCommaList( untypedExpr->args.begin(), untypedExpr->args.end() );
588 output << ")";
589 } // if
590 } else {
591 untypedExpr->function->accept( *visitor );
592 output << "(";
593 genCommaList( untypedExpr->args.begin(), untypedExpr->args.end() );
594 output << ")";
595 } // if
596 }
597
598 void CodeGenerator::postvisit( RangeExpr * rangeExpr ) {
599 rangeExpr->low->accept( *visitor );
600 output << " ... ";
601 rangeExpr->high->accept( *visitor );
602 }
603
604 void CodeGenerator::postvisit( NameExpr * nameExpr ) {
605 extension( nameExpr );
606 const OperatorInfo * opInfo = operatorLookup( nameExpr->name );
607 if ( opInfo ) {
608 if ( opInfo->type == OT_CONSTANT ) {
609 output << opInfo->symbol;
610 } else {
611 output << opInfo->outputName;
612 }
613 } else {
614 output << nameExpr->get_name();
615 } // if
616 }
617
618 void CodeGenerator::postvisit( DimensionExpr * dimensionExpr ) {
619 extension( dimensionExpr );
620 output << "/*non-type*/" << dimensionExpr->get_name();
621 }
622
623 void CodeGenerator::postvisit( AddressExpr * addressExpr ) {
624 extension( addressExpr );
625 output << "(&";
626 addressExpr->arg->accept( *visitor );
627 output << ")";
628 }
629
630 void CodeGenerator::postvisit( LabelAddressExpr *addressExpr ) {
631 extension( addressExpr );
632 output << "(&&" << addressExpr->arg << ")";
633 }
634
635 void CodeGenerator::postvisit( CastExpr * castExpr ) {
636 extension( castExpr );
637 output << "(";
638 if ( castExpr->get_result()->isVoid() ) {
639 output << "(void)";
640 } else {
641 // at least one result type of cast.
642 // Note: previously, lvalue casts were skipped. Since it's now impossible for the user to write
643 // an lvalue cast, this has been taken out.
644 output << "(";
645 output << genType( castExpr->get_result(), "", options );
646 output << ")";
647 } // if
648 castExpr->arg->accept( *visitor );
649 output << ")";
650 }
651
652 void CodeGenerator::postvisit( KeywordCastExpr * castExpr ) {
653 assertf( ! options.genC, "KeywordCast should not reach code generation." );
654 extension( castExpr );
655 output << "((" << castExpr->targetString() << " &)";
656 castExpr->arg->accept( *visitor );
657 output << ")";
658 }
659
660 void CodeGenerator::postvisit( VirtualCastExpr * castExpr ) {
661 assertf( ! options.genC, "VirtualCastExpr should not reach code generation." );
662 extension( castExpr );
663 output << "(virtual ";
664 castExpr->get_arg()->accept( *visitor );
665 output << ")";
666 }
667
668 void CodeGenerator::postvisit( UntypedMemberExpr * memberExpr ) {
669 assertf( ! options.genC, "UntypedMemberExpr should not reach code generation." );
670 extension( memberExpr );
671 memberExpr->get_aggregate()->accept( *visitor );
672 output << ".";
673 memberExpr->get_member()->accept( *visitor );
674 }
675
676 void CodeGenerator::postvisit( MemberExpr * memberExpr ) {
677 extension( memberExpr );
678 memberExpr->get_aggregate()->accept( *visitor );
679 output << "." << mangleName( memberExpr->get_member() );
680 }
681
682 void CodeGenerator::postvisit( VariableExpr * variableExpr ) {
683 extension( variableExpr );
684 const OperatorInfo * opInfo;
685 if( dynamic_cast<ZeroType*>( variableExpr->get_var()->get_type() ) ) {
686 output << "0";
687 } else if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && (opInfo = operatorLookup( variableExpr->get_var()->get_name() )) && opInfo->type == OT_CONSTANT ) {
688 output << opInfo->symbol;
689 } else {
690 // if (dynamic_cast<EnumInstType *>(variableExpr->get_var()->get_type())
691 // && dynamic_cast<EnumInstType *>(variableExpr->get_var()->get_type())->baseEnum->base) {
692 // output << '(' <<genType(dynamic_cast<EnumInstType *>(variableExpr->get_var()->get_type())->baseEnum->base, "", options) << ')';
693 // }
694 output << mangleName( variableExpr->get_var() );
695 } // if
696 }
697
698 void CodeGenerator::postvisit( ConstantExpr * constantExpr ) {
699 assert( constantExpr->get_constant() );
700 extension( constantExpr );
701 constantExpr->get_constant()->accept( *visitor );
702 }
703
704 void CodeGenerator::postvisit( SizeofExpr * sizeofExpr ) {
705 extension( sizeofExpr );
706 output << "sizeof(";
707 if ( sizeofExpr->get_isType() ) {
708 output << genType( sizeofExpr->get_type(), "", options );
709 } else {
710 sizeofExpr->get_expr()->accept( *visitor );
711 } // if
712 output << ")";
713 }
714
715 void CodeGenerator::postvisit( AlignofExpr * alignofExpr ) {
716 // use GCC extension to avoid bumping std to C11
717 extension( alignofExpr );
718 output << "__alignof__(";
719 if ( alignofExpr->get_isType() ) {
720 output << genType( alignofExpr->get_type(), "", options );
721 } else {
722 alignofExpr->get_expr()->accept( *visitor );
723 } // if
724 output << ")";
725 }
726
727 void CodeGenerator::postvisit( UntypedOffsetofExpr * offsetofExpr ) {
728 assertf( ! options.genC, "UntypedOffsetofExpr should not reach code generation." );
729 output << "offsetof(";
730 output << genType( offsetofExpr->get_type(), "", options );
731 output << ", " << offsetofExpr->get_member();
732 output << ")";
733 }
734
735 void CodeGenerator::postvisit( OffsetofExpr * offsetofExpr ) {
736 // use GCC builtin
737 output << "__builtin_offsetof(";
738 output << genType( offsetofExpr->get_type(), "", options );
739 output << ", " << mangleName( offsetofExpr->get_member() );
740 output << ")";
741 }
742
743 void CodeGenerator::postvisit( OffsetPackExpr * offsetPackExpr ) {
744 assertf( ! options.genC, "OffsetPackExpr should not reach code generation." );
745 output << "__CFA_offsetpack(" << genType( offsetPackExpr->get_type(), "", options ) << ")";
746 }
747
748 void CodeGenerator::postvisit( LogicalExpr * logicalExpr ) {
749 extension( logicalExpr );
750 output << "(";
751 logicalExpr->get_arg1()->accept( *visitor );
752 if ( logicalExpr->get_isAnd() ) {
753 output << " && ";
754 } else {
755 output << " || ";
756 } // if
757 logicalExpr->get_arg2()->accept( *visitor );
758 output << ")";
759 }
760
761 void CodeGenerator::postvisit( ConditionalExpr * conditionalExpr ) {
762 extension( conditionalExpr );
763 output << "(";
764 conditionalExpr->get_arg1()->accept( *visitor );
765 output << " ? ";
766 conditionalExpr->get_arg2()->accept( *visitor );
767 output << " : ";
768 conditionalExpr->get_arg3()->accept( *visitor );
769 output << ")";
770 }
771
772 void CodeGenerator::postvisit( CommaExpr * commaExpr ) {
773 extension( commaExpr );
774 output << "(";
775 if ( options.genC ) {
776 // arg1 of a CommaExpr is never used, so it can be safely cast to void to reduce gcc warnings.
777 commaExpr->set_arg1( new CastExpr( commaExpr->get_arg1() ) );
778 }
779 commaExpr->get_arg1()->accept( *visitor );
780 output << " , ";
781 commaExpr->get_arg2()->accept( *visitor );
782 output << ")";
783 }
784
785 void CodeGenerator::postvisit( TupleAssignExpr * tupleExpr ) {
786 assertf( ! options.genC, "TupleAssignExpr should not reach code generation." );
787 tupleExpr->stmtExpr->accept( *visitor );
788 }
789
790 void CodeGenerator::postvisit( UntypedTupleExpr * tupleExpr ) {
791 assertf( ! options.genC, "UntypedTupleExpr should not reach code generation." );
792 extension( tupleExpr );
793 output << "[";
794 genCommaList( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end() );
795 output << "]";
796 }
797
798 void CodeGenerator::postvisit( TupleExpr * tupleExpr ) {
799 assertf( ! options.genC, "TupleExpr should not reach code generation." );
800 extension( tupleExpr );
801 output << "[";
802 genCommaList( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end() );
803 output << "]";
804 }
805
806 void CodeGenerator::postvisit( TupleIndexExpr * tupleExpr ) {
807 assertf( ! options.genC, "TupleIndexExpr should not reach code generation." );
808 extension( tupleExpr );
809 tupleExpr->get_tuple()->accept( *visitor );
810 output << "." << tupleExpr->get_index();
811 }
812
813 void CodeGenerator::postvisit( TypeExpr * typeExpr ) {
814 // if ( options.genC ) std::cerr << "typeexpr still exists: " << typeExpr << std::endl;
815 // assertf( ! options.genC, "TypeExpr should not reach code generation." );
816 if ( ! options.genC ) {
817 output << genType( typeExpr->get_type(), "", options );
818 }
819 }
820
821 void CodeGenerator::postvisit( AsmExpr * asmExpr ) {
822 if ( !asmExpr->inout.empty() ) {
823 output << "[ ";
824 output << asmExpr->inout;
825 output << " ] ";
826 } // if
827 asmExpr->constraint->accept( *visitor );
828 output << " ( ";
829 asmExpr->operand->accept( *visitor );
830 output << " )";
831 }
832
833 void CodeGenerator::postvisit( CompoundLiteralExpr *compLitExpr ) {
834 assert( compLitExpr->get_result() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
835 output << "(" << genType( compLitExpr->get_result(), "", options ) << ")";
836 compLitExpr->get_initializer()->accept( *visitor );
837 }
838
839 void CodeGenerator::postvisit( UniqueExpr * unqExpr ) {
840 assertf( ! options.genC, "Unique expressions should not reach code generation." );
841 output << "unq<" << unqExpr->get_id() << ">{ ";
842 unqExpr->get_expr()->accept( *visitor );
843 output << " }";
844 }
845
846 void CodeGenerator::postvisit( StmtExpr * stmtExpr ) {
847 std::list< Statement * > & stmts = stmtExpr->statements->kids;
848 output << "({" << endl;
849 ++indent;
850 unsigned int numStmts = stmts.size();
851 unsigned int i = 0;
852 for ( Statement * stmt : stmts ) {
853 output << indent << printLabels( stmt->get_labels() );
854 if ( i+1 == numStmts ) {
855 // last statement in a statement expression needs to be handled specially -
856 // cannot cast to void, otherwise the expression statement has no value
857 if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
858 exprStmt->expr->accept( *visitor );
859 output << ";" << endl;
860 ++i;
861 break;
862 }
863 }
864 stmt->accept( *visitor );
865 output << endl;
866 if ( wantSpacing( stmt ) ) {
867 output << endl;
868 } // if
869 ++i;
870 }
871 --indent;
872 output << indent << "})";
873 }
874
875 void CodeGenerator::postvisit( ConstructorExpr * expr ) {
876 assertf( ! options.genC, "Unique expressions should not reach code generation." );
877 expr->callExpr->accept( *visitor );
878 }
879
880 void CodeGenerator::postvisit( DeletedExpr * expr ) {
881 assertf( ! options.genC, "Deleted expressions should not reach code generation." );
882 expr->expr->accept( *visitor );
883 }
884
885 void CodeGenerator::postvisit( DefaultArgExpr * arg ) {
886 assertf( ! options.genC, "Default argument expressions should not reach code generation." );
887 arg->expr->accept( *visitor );
888 }
889
890 void CodeGenerator::postvisit( GenericExpr * expr ) {
891 assertf( ! options.genC, "C11 _Generic expressions should not reach code generation." );
892 output << "_Generic(";
893 expr->control->accept( *visitor );
894 output << ", ";
895 unsigned int numAssocs = expr->associations.size();
896 unsigned int i = 0;
897 for ( GenericExpr::Association & assoc : expr->associations ) {
898 if (assoc.isDefault) {
899 output << "default: ";
900 } else {
901 output << genType( assoc.type, "", options ) << ": ";
902 }
903 assoc.expr->accept( *visitor );
904 if ( i+1 != numAssocs ) {
905 output << ", ";
906 }
907 i++;
908 }
909 output << ")";
910 }
911
912
913 // *** Statements
914 void CodeGenerator::postvisit( CompoundStmt * compoundStmt ) {
915 std::list<Statement*> ks = compoundStmt->get_kids();
916 output << "{" << endl;
917
918 ++indent;
919
920 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
921 output << indent << printLabels( (*i)->get_labels() );
922 (*i)->accept( *visitor );
923
924 output << endl;
925 if ( wantSpacing( *i ) ) {
926 output << endl;
927 } // if
928 } // for
929 --indent;
930
931 output << indent << "}";
932 }
933
934 void CodeGenerator::postvisit( ExprStmt * exprStmt ) {
935 assert( exprStmt );
936 if ( options.genC ) {
937 // cast the top-level expression to void to reduce gcc warnings.
938 exprStmt->set_expr( new CastExpr( exprStmt->get_expr() ) );
939 }
940 exprStmt->get_expr()->accept( *visitor );
941 output << ";";
942 }
943
944 void CodeGenerator::postvisit( AsmStmt * asmStmt ) {
945 output << "asm ";
946 if ( asmStmt->get_voltile() ) output << "volatile ";
947 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
948 output << "( ";
949 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *visitor );
950 output << " : ";
951 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
952 output << " : ";
953 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
954 output << " : ";
955 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
956 if ( ! asmStmt->get_gotolabels().empty() ) {
957 output << " : ";
958 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
959 output << *begin++;
960 if ( begin == asmStmt->get_gotolabels().end() ) break;
961 output << ", ";
962 } // for
963 } // if
964 output << " );";
965 }
966
967 void CodeGenerator::postvisit( AsmDecl * asmDecl ) {
968 output << "asm ";
969 AsmStmt * asmStmt = asmDecl->get_stmt();
970 output << "( ";
971 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *visitor );
972 output << " )";
973 }
974
975 void CodeGenerator::postvisit( DirectiveDecl * directiveDecl ) {
976 output << endl << directiveDecl->get_stmt()->directive; // endl prevents spaces before directive
977 }
978
979 void CodeGenerator::postvisit( DirectiveStmt * dirStmt ) {
980 output << endl << dirStmt->directive; // endl prevents spaces before directive
981 }
982
983 void CodeGenerator::postvisit( IfStmt * ifStmt ) {
984 output << "if ( ";
985 ifStmt->get_condition()->accept( *visitor );
986 output << " ) ";
987
988 ifStmt->get_then()->accept( *visitor );
989
990 if ( ifStmt->get_else() != 0) {
991 output << " else ";
992 ifStmt->get_else()->accept( *visitor );
993 } // if
994 }
995
996 void CodeGenerator::postvisit( SwitchStmt * switchStmt ) {
997 output << "switch ( ";
998 switchStmt->get_condition()->accept( *visitor );
999 output << " ) ";
1000
1001 output << "{" << endl;
1002 ++indent;
1003 acceptAll( switchStmt->get_statements(), *visitor );
1004 --indent;
1005 output << indent << "}";
1006 }
1007
1008 void CodeGenerator::postvisit( CaseStmt * caseStmt ) {
1009 updateLocation( caseStmt );
1010 output << indent;
1011 if ( caseStmt->isDefault()) {
1012 output << "default";
1013 } else {
1014 output << "case ";
1015 caseStmt->get_condition()->accept( *visitor );
1016 } // if
1017 output << ":" << endl;
1018
1019 std::list<Statement *> sts = caseStmt->get_statements();
1020
1021 ++indent;
1022 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
1023 output << indent << printLabels( (*i)->get_labels() ) ;
1024 (*i)->accept( *visitor );
1025 output << endl;
1026 } // for
1027 --indent;
1028 }
1029
1030 void CodeGenerator::postvisit( BranchStmt * branchStmt ) {
1031 switch ( branchStmt->get_type()) {
1032 case BranchStmt::Goto:
1033 if ( ! branchStmt->get_target().empty() )
1034 output << "goto " << branchStmt->get_target();
1035 else {
1036 if ( branchStmt->get_computedTarget() != 0 ) {
1037 output << "goto *";
1038 branchStmt->get_computedTarget()->accept( *visitor );
1039 } // if
1040 } // if
1041 break;
1042 case BranchStmt::Break:
1043 output << "break";
1044 break;
1045 case BranchStmt::Continue:
1046 output << "continue";
1047 break;
1048 case BranchStmt::FallThrough:
1049 case BranchStmt::FallThroughDefault:
1050 assertf( ! options.genC, "fallthru should not reach code generation." );
1051 output << "fallthru";
1052 break;
1053 default: ; // prevent warning
1054 } // switch
1055 // print branch target for labelled break/continue/fallthru in debug mode
1056 if ( ! options.genC && branchStmt->get_type() != BranchStmt::Goto ) {
1057 if ( ! branchStmt->get_target().empty() ) {
1058 output << " " << branchStmt->get_target();
1059 } else if ( branchStmt->get_type() == BranchStmt::FallThrough ) {
1060 output << " default";
1061 }
1062 }
1063 output << ";";
1064 }
1065
1066 void CodeGenerator::postvisit( ReturnStmt * returnStmt ) {
1067 output << "return ";
1068 maybeAccept( returnStmt->get_expr(), *visitor );
1069 output << ";";
1070 }
1071
1072 void CodeGenerator::postvisit( ThrowStmt * throwStmt ) {
1073 assertf( ! options.genC, "Throw statements should not reach code generation." );
1074
1075 output << ((throwStmt->get_kind() == ThrowStmt::Terminate) ?
1076 "throw" : "throwResume");
1077 if (throwStmt->get_expr()) {
1078 output << " ";
1079 throwStmt->get_expr()->accept( *visitor );
1080 }
1081 if (throwStmt->get_target()) {
1082 output << " _At ";
1083 throwStmt->get_target()->accept( *visitor );
1084 }
1085 output << ";";
1086 }
1087 void CodeGenerator::postvisit( CatchStmt * stmt ) {
1088 assertf( ! options.genC, "Catch statements should not reach code generation." );
1089
1090 output << ((stmt->get_kind() == CatchStmt::Terminate) ?
1091 "catch" : "catchResume");
1092 output << "( ";
1093 stmt->decl->accept( *visitor );
1094 output << " ) ";
1095
1096 if( stmt->cond ) {
1097 output << "if/when(?) (";
1098 stmt->cond->accept( *visitor );
1099 output << ") ";
1100 }
1101 stmt->body->accept( *visitor );
1102 }
1103
1104 void CodeGenerator::postvisit( WaitForStmt * stmt ) {
1105 assertf( ! options.genC, "Waitfor statements should not reach code generation." );
1106
1107 bool first = true;
1108 for( auto & clause : stmt->clauses ) {
1109 if(first) { output << "or "; first = false; }
1110 if( clause.condition ) {
1111 output << "when(";
1112 stmt->timeout.condition->accept( *visitor );
1113 output << ") ";
1114 }
1115 output << "waitfor(";
1116 clause.target.function->accept( *visitor );
1117 for( Expression * expr : clause.target.arguments ) {
1118 output << ",";
1119 expr->accept( *visitor );
1120 }
1121 output << ") ";
1122 clause.statement->accept( *visitor );
1123 }
1124
1125 if( stmt->timeout.statement ) {
1126 output << "or ";
1127 if( stmt->timeout.condition ) {
1128 output << "when(";
1129 stmt->timeout.condition->accept( *visitor );
1130 output << ") ";
1131 }
1132 output << "timeout(";
1133 stmt->timeout.time->accept( *visitor );
1134 output << ") ";
1135 stmt->timeout.statement->accept( *visitor );
1136 }
1137
1138 if( stmt->orelse.statement ) {
1139 output << "or ";
1140 if( stmt->orelse.condition ) {
1141 output << "when(";
1142 stmt->orelse.condition->accept( *visitor );
1143 output << ")";
1144 }
1145 output << "else ";
1146 stmt->orelse.statement->accept( *visitor );
1147 }
1148 }
1149
1150 void CodeGenerator::postvisit( WithStmt * with ) {
1151 if ( ! options.genC ) {
1152 output << "with ( ";
1153 genCommaList( with->exprs.begin(), with->exprs.end() );
1154 output << " ) ";
1155 }
1156 with->stmt->accept( *visitor );
1157 }
1158
1159 void CodeGenerator::postvisit( WhileDoStmt * whileDoStmt ) {
1160 if ( whileDoStmt->get_isDoWhile() ) {
1161 output << "do";
1162 } else {
1163 output << "while (";
1164 whileDoStmt->get_condition()->accept( *visitor );
1165 output << ")";
1166 } // if
1167 output << " ";
1168
1169 output << CodeGenerator::printLabels( whileDoStmt->get_body()->get_labels() );
1170 whileDoStmt->get_body()->accept( *visitor );
1171
1172 output << indent;
1173
1174 if ( whileDoStmt->get_isDoWhile() ) {
1175 output << " while (";
1176 whileDoStmt->get_condition()->accept( *visitor );
1177 output << ");";
1178 } // if
1179 }
1180
1181 void CodeGenerator::postvisit( ForStmt * forStmt ) {
1182 // initialization is always hoisted, so don't bother doing anything with that
1183 output << "for (;";
1184
1185 if ( forStmt->get_condition() != 0 ) {
1186 forStmt->get_condition()->accept( *visitor );
1187 } // if
1188 output << ";";
1189
1190 if ( forStmt->get_increment() != 0 ) {
1191 // cast the top-level expression to void to reduce gcc warnings.
1192 Expression * expr = new CastExpr( forStmt->get_increment() );
1193 expr->accept( *visitor );
1194 } // if
1195 output << ") ";
1196
1197 if ( forStmt->get_body() != 0 ) {
1198 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
1199 forStmt->get_body()->accept( *visitor );
1200 } // if
1201 }
1202
1203 void CodeGenerator::postvisit( __attribute__((unused)) NullStmt * nullStmt ) {
1204 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
1205 output << "/* null statement */ ;";
1206 }
1207
1208 void CodeGenerator::postvisit( DeclStmt * declStmt ) {
1209 declStmt->get_decl()->accept( *visitor );
1210
1211 if ( doSemicolon( declStmt->get_decl() ) ) {
1212 output << ";";
1213 } // if
1214 }
1215
1216 void CodeGenerator::postvisit( ImplicitCtorDtorStmt * stmt ) {
1217 assertf( ! options.genC, "ImplicitCtorDtorStmts should not reach code generation." );
1218 stmt->callStmt->accept( *visitor );
1219 }
1220
1221 void CodeGenerator::postvisit( MutexStmt * stmt ) {
1222 assertf( ! options.genC, "ImplicitCtorDtorStmts should not reach code generation." );
1223 stmt->stmt->accept( *visitor );
1224 }
1225
1226 void CodeGenerator::handleStorageClass( DeclarationWithType * decl ) {
1227 if ( decl->get_storageClasses().any() ) {
1228 decl->get_storageClasses().print( output );
1229 } // if
1230 } // CodeGenerator::handleStorageClass
1231
1232 std::string genName( DeclarationWithType * decl ) {
1233 const OperatorInfo * opInfo = operatorLookup( decl->get_name() );
1234 if ( opInfo ) {
1235 return opInfo->outputName;
1236 } else {
1237 return decl->get_name();
1238 } // if
1239 }
1240} // namespace CodeGen
1241
1242// Local Variables: //
1243// tab-width: 4 //
1244// mode: c++ //
1245// compile-command: "make install" //
1246// End: //
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