source: src/CodeGen/CodeGenerator.cc@ 21fe17f

ADT ast-experimental enum forall-pointer-decay pthread-emulation qualifiedEnum
Last change on this file since 21fe17f was 6cebfef, checked in by caparsons <caparson@…>, 4 years ago

added mutex stmt monitor
  • Property mode set to 100644
File size: 38.0 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 : Fri Mar 12 19:00:42 2021
13// Update Count : 536
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< WhileStmt * >( 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 output << "enum ";
277 genAttributes( enumDecl->get_attributes() );
278
279 output << enumDecl->get_name();
280
281 std::list< Declaration* > &memb = enumDecl->get_members();
282
283 if ( ! memb.empty() ) {
284 output << " {" << endl;
285
286 ++indent;
287 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
288 ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
289 assert( obj );
290 output << indent << mangleName( obj );
291 if ( obj->get_init() ) {
292 output << " = ";
293 obj->get_init()->accept( *visitor );
294 } // if
295 output << "," << endl;
296 } // for
297
298 --indent;
299
300 output << indent << "}";
301 } // if
302 }
303
304 void CodeGenerator::postvisit( TraitDecl * traitDecl ) {
305 assertf( ! options.genC, "TraitDecls should not reach code generation." );
306 extension( traitDecl );
307 handleAggregate( traitDecl, "trait " );
308 }
309
310 void CodeGenerator::postvisit( TypedefDecl * typeDecl ) {
311 assertf( ! options.genC, "Typedefs are removed and substituted in earlier passes." );
312 output << "typedef ";
313 output << genType( typeDecl->get_base(), typeDecl->get_name(), options ) << endl;
314 }
315
316 void CodeGenerator::postvisit( TypeDecl * typeDecl ) {
317 assertf( ! options.genC, "TypeDecls should not reach code generation." );
318 output << typeDecl->genTypeString() << " " << typeDecl->name;
319 if ( typeDecl->sized ) {
320 output << " | sized(" << typeDecl->name << ")";
321 }
322 if ( ! typeDecl->assertions.empty() ) {
323 output << " | { ";
324 for ( DeclarationWithType * assert : typeDecl->assertions ) {
325 assert->accept( *visitor );
326 output << "; ";
327 }
328 output << " }";
329 }
330 }
331
332 void CodeGenerator::postvisit( StaticAssertDecl * assertDecl ) {
333 output << "_Static_assert(";
334 assertDecl->condition->accept( *visitor );
335 output << ", ";
336 assertDecl->message->accept( *visitor );
337 output << ")";
338 }
339
340 void CodeGenerator::postvisit( Designation * designation ) {
341 std::list< Expression * > designators = designation->get_designators();
342 if ( designators.size() == 0 ) return;
343 for ( Expression * des : designators ) {
344 if ( dynamic_cast< NameExpr * >( des ) || dynamic_cast< VariableExpr * >( des ) ) {
345 // if expression is a NameExpr or VariableExpr, then initializing aggregate member
346 output << ".";
347 des->accept( *visitor );
348 } else {
349 // otherwise, it has to be a ConstantExpr or CastExpr, initializing array eleemnt
350 output << "[";
351 des->accept( *visitor );
352 output << "]";
353 } // if
354 } // for
355 output << " = ";
356 }
357
358 void CodeGenerator::postvisit( SingleInit * init ) {
359 init->get_value()->accept( *visitor );
360 }
361
362 void CodeGenerator::postvisit( ListInit * init ) {
363 auto initBegin = init->begin();
364 auto initEnd = init->end();
365 auto desigBegin = init->get_designations().begin();
366 auto desigEnd = init->get_designations().end();
367
368 output << "{ ";
369 for ( ; initBegin != initEnd && desigBegin != desigEnd; ) {
370 (*desigBegin)->accept( *visitor );
371 (*initBegin)->accept( *visitor );
372 ++initBegin, ++desigBegin;
373 if ( initBegin != initEnd ) {
374 output << ", ";
375 }
376 }
377 output << " }";
378 assertf( initBegin == initEnd && desigBegin == desigEnd, "Initializers and designators not the same length. %s", toString( init ).c_str() );
379 }
380
381 void CodeGenerator::postvisit( ConstructorInit * init ){
382 assertf( ! options.genC, "ConstructorInit nodes should not reach code generation." );
383 // pseudo-output for constructor/destructor pairs
384 output << "<ctorinit>{" << endl << ++indent << "ctor: ";
385 maybeAccept( init->get_ctor(), *visitor );
386 output << ", " << endl << indent << "dtor: ";
387 maybeAccept( init->get_dtor(), *visitor );
388 output << endl << --indent << "}";
389 }
390
391 void CodeGenerator::postvisit( Constant * constant ) {
392 output << constant->get_value();
393 }
394
395 // *** Expressions
396 void CodeGenerator::postvisit( ApplicationExpr * applicationExpr ) {
397 extension( applicationExpr );
398 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
399 const OperatorInfo * opInfo;
400 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && ( opInfo = operatorLookup( varExpr->get_var()->get_name() ) ) ) {
401 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
402 switch ( opInfo->type ) {
403 case OT_INDEX:
404 assert( applicationExpr->get_args().size() == 2 );
405 (*arg++)->accept( *visitor );
406 output << "[";
407 (*arg)->accept( *visitor );
408 output << "]";
409 break;
410
411 case OT_CALL:
412 // there are no intrinsic definitions of the function call operator
413 assert( false );
414 break;
415
416 case OT_CTOR:
417 case OT_DTOR:
418 if ( applicationExpr->get_args().size() == 1 ) {
419 // the expression fed into a single parameter constructor or destructor may contain side
420 // effects, so must still output this expression
421 output << "(";
422 (*arg++)->accept( *visitor );
423 output << ") /* " << opInfo->inputName << " */";
424 } else if ( applicationExpr->get_args().size() == 2 ) {
425 // intrinsic two parameter constructors are essentially bitwise assignment
426 output << "(";
427 (*arg++)->accept( *visitor );
428 output << opInfo->symbol;
429 (*arg)->accept( *visitor );
430 output << ") /* " << opInfo->inputName << " */";
431 } else {
432 // no constructors with 0 or more than 2 parameters
433 assert( false );
434 } // if
435 break;
436
437 case OT_PREFIX:
438 case OT_PREFIXASSIGN:
439 assert( applicationExpr->get_args().size() == 1 );
440 output << "(";
441 output << opInfo->symbol;
442 (*arg)->accept( *visitor );
443 output << ")";
444 break;
445
446 case OT_POSTFIX:
447 case OT_POSTFIXASSIGN:
448 assert( applicationExpr->get_args().size() == 1 );
449 (*arg)->accept( *visitor );
450 output << opInfo->symbol;
451 break;
452
453
454 case OT_INFIX:
455 case OT_INFIXASSIGN:
456 assert( applicationExpr->get_args().size() == 2 );
457 output << "(";
458 (*arg++)->accept( *visitor );
459 output << opInfo->symbol;
460 (*arg)->accept( *visitor );
461 output << ")";
462 break;
463
464 case OT_CONSTANT:
465 case OT_LABELADDRESS:
466 // there are no intrinsic definitions of 0/1 or label addresses as functions
467 assert( false );
468 } // switch
469 } else {
470 varExpr->accept( *visitor );
471 output << "(";
472 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
473 output << ")";
474 } // if
475 } else {
476 applicationExpr->get_function()->accept( *visitor );
477 output << "(";
478 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
479 output << ")";
480 } // if
481 }
482
483 void CodeGenerator::postvisit( UntypedExpr * untypedExpr ) {
484 extension( untypedExpr );
485 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->function ) ) {
486 const OperatorInfo * opInfo = operatorLookup( nameExpr->name );
487 if ( opInfo ) {
488 std::list< Expression* >::iterator arg = untypedExpr->args.begin();
489 switch ( opInfo->type ) {
490 case OT_INDEX:
491 assert( untypedExpr->args.size() == 2 );
492 (*arg++)->accept( *visitor );
493 output << "[";
494 (*arg)->accept( *visitor );
495 output << "]";
496 break;
497
498 case OT_CALL:
499 assert( false );
500
501 case OT_CTOR:
502 case OT_DTOR:
503 if ( untypedExpr->args.size() == 1 ) {
504 // the expression fed into a single parameter constructor or destructor may contain side
505 // effects, so must still output this expression
506 output << "(";
507 (*arg++)->accept( *visitor );
508 output << ") /* " << opInfo->inputName << " */";
509 } else if ( untypedExpr->get_args().size() == 2 ) {
510 // intrinsic two parameter constructors are essentially bitwise assignment
511 output << "(";
512 (*arg++)->accept( *visitor );
513 output << opInfo->symbol;
514 (*arg)->accept( *visitor );
515 output << ") /* " << opInfo->inputName << " */";
516 } else {
517 // no constructors with 0 or more than 2 parameters
518 assertf( ! options.genC, "UntypedExpr constructor/destructor with 0 or more than 2 parameters." );
519 output << "(";
520 (*arg++)->accept( *visitor );
521 output << opInfo->symbol << "{ ";
522 genCommaList( arg, untypedExpr->args.end() );
523 output << "}) /* " << opInfo->inputName << " */";
524 } // if
525 break;
526
527 case OT_PREFIX:
528 case OT_PREFIXASSIGN:
529 case OT_LABELADDRESS:
530 assert( untypedExpr->args.size() == 1 );
531 output << "(";
532 output << opInfo->symbol;
533 (*arg)->accept( *visitor );
534 output << ")";
535 break;
536
537 case OT_POSTFIX:
538 case OT_POSTFIXASSIGN:
539 assert( untypedExpr->args.size() == 1 );
540 (*arg)->accept( *visitor );
541 output << opInfo->symbol;
542 break;
543
544 case OT_INFIX:
545 case OT_INFIXASSIGN:
546 assert( untypedExpr->args.size() == 2 );
547 output << "(";
548 (*arg++)->accept( *visitor );
549 output << opInfo->symbol;
550 (*arg)->accept( *visitor );
551 output << ")";
552 break;
553
554 case OT_CONSTANT:
555 // there are no intrinsic definitions of 0 or 1 as functions
556 assert( false );
557 } // switch
558 } else {
559 // builtin routines
560 nameExpr->accept( *visitor );
561 output << "(";
562 genCommaList( untypedExpr->args.begin(), untypedExpr->args.end() );
563 output << ")";
564 } // if
565 } else {
566 untypedExpr->function->accept( *visitor );
567 output << "(";
568 genCommaList( untypedExpr->args.begin(), untypedExpr->args.end() );
569 output << ")";
570 } // if
571 }
572
573 void CodeGenerator::postvisit( RangeExpr * rangeExpr ) {
574 rangeExpr->low->accept( *visitor );
575 output << " ... ";
576 rangeExpr->high->accept( *visitor );
577 }
578
579 void CodeGenerator::postvisit( NameExpr * nameExpr ) {
580 extension( nameExpr );
581 const OperatorInfo * opInfo = operatorLookup( nameExpr->name );
582 if ( opInfo ) {
583 if ( opInfo->type == OT_CONSTANT ) {
584 output << opInfo->symbol;
585 } else {
586 output << opInfo->outputName;
587 }
588 } else {
589 output << nameExpr->get_name();
590 } // if
591 }
592
593 void CodeGenerator::postvisit( DimensionExpr * dimensionExpr ) {
594 extension( dimensionExpr );
595 output << "/*non-type*/" << dimensionExpr->get_name();
596 }
597
598 void CodeGenerator::postvisit( AddressExpr * addressExpr ) {
599 extension( addressExpr );
600 output << "(&";
601 addressExpr->arg->accept( *visitor );
602 output << ")";
603 }
604
605 void CodeGenerator::postvisit( LabelAddressExpr *addressExpr ) {
606 extension( addressExpr );
607 output << "(&&" << addressExpr->arg << ")";
608 }
609
610 void CodeGenerator::postvisit( CastExpr * castExpr ) {
611 extension( castExpr );
612 output << "(";
613 if ( castExpr->get_result()->isVoid() ) {
614 output << "(void)";
615 } else {
616 // at least one result type of cast.
617 // Note: previously, lvalue casts were skipped. Since it's now impossible for the user to write
618 // an lvalue cast, this has been taken out.
619 output << "(";
620 output << genType( castExpr->get_result(), "", options );
621 output << ")";
622 } // if
623 castExpr->arg->accept( *visitor );
624 output << ")";
625 }
626
627 void CodeGenerator::postvisit( KeywordCastExpr * castExpr ) {
628 assertf( ! options.genC, "KeywordCast should not reach code generation." );
629 extension( castExpr );
630 output << "((" << castExpr->targetString() << " &)";
631 castExpr->arg->accept( *visitor );
632 output << ")";
633 }
634
635 void CodeGenerator::postvisit( VirtualCastExpr * castExpr ) {
636 assertf( ! options.genC, "VirtualCastExpr should not reach code generation." );
637 extension( castExpr );
638 output << "(virtual ";
639 castExpr->get_arg()->accept( *visitor );
640 output << ")";
641 }
642
643 void CodeGenerator::postvisit( UntypedMemberExpr * memberExpr ) {
644 assertf( ! options.genC, "UntypedMemberExpr should not reach code generation." );
645 extension( memberExpr );
646 memberExpr->get_aggregate()->accept( *visitor );
647 output << ".";
648 memberExpr->get_member()->accept( *visitor );
649 }
650
651 void CodeGenerator::postvisit( MemberExpr * memberExpr ) {
652 extension( memberExpr );
653 memberExpr->get_aggregate()->accept( *visitor );
654 output << "." << mangleName( memberExpr->get_member() );
655 }
656
657 void CodeGenerator::postvisit( VariableExpr * variableExpr ) {
658 extension( variableExpr );
659 const OperatorInfo * opInfo;
660 if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && (opInfo = operatorLookup( variableExpr->get_var()->get_name() )) && opInfo->type == OT_CONSTANT ) {
661 output << opInfo->symbol;
662 } else {
663 output << mangleName( variableExpr->get_var() );
664 } // if
665 }
666
667 void CodeGenerator::postvisit( ConstantExpr * constantExpr ) {
668 assert( constantExpr->get_constant() );
669 extension( constantExpr );
670 constantExpr->get_constant()->accept( *visitor );
671 }
672
673 void CodeGenerator::postvisit( SizeofExpr * sizeofExpr ) {
674 extension( sizeofExpr );
675 output << "sizeof(";
676 if ( sizeofExpr->get_isType() ) {
677 output << genType( sizeofExpr->get_type(), "", options );
678 } else {
679 sizeofExpr->get_expr()->accept( *visitor );
680 } // if
681 output << ")";
682 }
683
684 void CodeGenerator::postvisit( AlignofExpr * alignofExpr ) {
685 // use GCC extension to avoid bumping std to C11
686 extension( alignofExpr );
687 output << "__alignof__(";
688 if ( alignofExpr->get_isType() ) {
689 output << genType( alignofExpr->get_type(), "", options );
690 } else {
691 alignofExpr->get_expr()->accept( *visitor );
692 } // if
693 output << ")";
694 }
695
696 void CodeGenerator::postvisit( UntypedOffsetofExpr * offsetofExpr ) {
697 assertf( ! options.genC, "UntypedOffsetofExpr should not reach code generation." );
698 output << "offsetof(";
699 output << genType( offsetofExpr->get_type(), "", options );
700 output << ", " << offsetofExpr->get_member();
701 output << ")";
702 }
703
704 void CodeGenerator::postvisit( OffsetofExpr * offsetofExpr ) {
705 // use GCC builtin
706 output << "__builtin_offsetof(";
707 output << genType( offsetofExpr->get_type(), "", options );
708 output << ", " << mangleName( offsetofExpr->get_member() );
709 output << ")";
710 }
711
712 void CodeGenerator::postvisit( OffsetPackExpr * offsetPackExpr ) {
713 assertf( ! options.genC, "OffsetPackExpr should not reach code generation." );
714 output << "__CFA_offsetpack(" << genType( offsetPackExpr->get_type(), "", options ) << ")";
715 }
716
717 void CodeGenerator::postvisit( LogicalExpr * logicalExpr ) {
718 extension( logicalExpr );
719 output << "(";
720 logicalExpr->get_arg1()->accept( *visitor );
721 if ( logicalExpr->get_isAnd() ) {
722 output << " && ";
723 } else {
724 output << " || ";
725 } // if
726 logicalExpr->get_arg2()->accept( *visitor );
727 output << ")";
728 }
729
730 void CodeGenerator::postvisit( ConditionalExpr * conditionalExpr ) {
731 extension( conditionalExpr );
732 output << "(";
733 conditionalExpr->get_arg1()->accept( *visitor );
734 output << " ? ";
735 conditionalExpr->get_arg2()->accept( *visitor );
736 output << " : ";
737 conditionalExpr->get_arg3()->accept( *visitor );
738 output << ")";
739 }
740
741 void CodeGenerator::postvisit( CommaExpr * commaExpr ) {
742 extension( commaExpr );
743 output << "(";
744 if ( options.genC ) {
745 // arg1 of a CommaExpr is never used, so it can be safely cast to void to reduce gcc warnings.
746 commaExpr->set_arg1( new CastExpr( commaExpr->get_arg1() ) );
747 }
748 commaExpr->get_arg1()->accept( *visitor );
749 output << " , ";
750 commaExpr->get_arg2()->accept( *visitor );
751 output << ")";
752 }
753
754 void CodeGenerator::postvisit( TupleAssignExpr * tupleExpr ) {
755 assertf( ! options.genC, "TupleAssignExpr should not reach code generation." );
756 tupleExpr->stmtExpr->accept( *visitor );
757 }
758
759 void CodeGenerator::postvisit( UntypedTupleExpr * tupleExpr ) {
760 assertf( ! options.genC, "UntypedTupleExpr should not reach code generation." );
761 extension( tupleExpr );
762 output << "[";
763 genCommaList( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end() );
764 output << "]";
765 }
766
767 void CodeGenerator::postvisit( TupleExpr * tupleExpr ) {
768 assertf( ! options.genC, "TupleExpr should not reach code generation." );
769 extension( tupleExpr );
770 output << "[";
771 genCommaList( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end() );
772 output << "]";
773 }
774
775 void CodeGenerator::postvisit( TupleIndexExpr * tupleExpr ) {
776 assertf( ! options.genC, "TupleIndexExpr should not reach code generation." );
777 extension( tupleExpr );
778 tupleExpr->get_tuple()->accept( *visitor );
779 output << "." << tupleExpr->get_index();
780 }
781
782 void CodeGenerator::postvisit( TypeExpr * typeExpr ) {
783 // if ( options.genC ) std::cerr << "typeexpr still exists: " << typeExpr << std::endl;
784 // assertf( ! options.genC, "TypeExpr should not reach code generation." );
785 if ( ! options.genC ) {
786 output << genType( typeExpr->get_type(), "", options );
787 }
788 }
789
790 void CodeGenerator::postvisit( AsmExpr * asmExpr ) {
791 if ( !asmExpr->inout.empty() ) {
792 output << "[ ";
793 output << asmExpr->inout;
794 output << " ] ";
795 } // if
796 asmExpr->constraint->accept( *visitor );
797 output << " ( ";
798 asmExpr->operand->accept( *visitor );
799 output << " )";
800 }
801
802 void CodeGenerator::postvisit( CompoundLiteralExpr *compLitExpr ) {
803 assert( compLitExpr->get_result() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
804 output << "(" << genType( compLitExpr->get_result(), "", options ) << ")";
805 compLitExpr->get_initializer()->accept( *visitor );
806 }
807
808 void CodeGenerator::postvisit( UniqueExpr * unqExpr ) {
809 assertf( ! options.genC, "Unique expressions should not reach code generation." );
810 output << "unq<" << unqExpr->get_id() << ">{ ";
811 unqExpr->get_expr()->accept( *visitor );
812 output << " }";
813 }
814
815 void CodeGenerator::postvisit( StmtExpr * stmtExpr ) {
816 std::list< Statement * > & stmts = stmtExpr->statements->kids;
817 output << "({" << endl;
818 ++indent;
819 unsigned int numStmts = stmts.size();
820 unsigned int i = 0;
821 for ( Statement * stmt : stmts ) {
822 output << indent << printLabels( stmt->get_labels() );
823 if ( i+1 == numStmts ) {
824 // last statement in a statement expression needs to be handled specially -
825 // cannot cast to void, otherwise the expression statement has no value
826 if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
827 exprStmt->expr->accept( *visitor );
828 output << ";" << endl;
829 ++i;
830 break;
831 }
832 }
833 stmt->accept( *visitor );
834 output << endl;
835 if ( wantSpacing( stmt ) ) {
836 output << endl;
837 } // if
838 ++i;
839 }
840 --indent;
841 output << indent << "})";
842 }
843
844 void CodeGenerator::postvisit( ConstructorExpr * expr ) {
845 assertf( ! options.genC, "Unique expressions should not reach code generation." );
846 expr->callExpr->accept( *visitor );
847 }
848
849 void CodeGenerator::postvisit( DeletedExpr * expr ) {
850 assertf( ! options.genC, "Deleted expressions should not reach code generation." );
851 expr->expr->accept( *visitor );
852 }
853
854 void CodeGenerator::postvisit( DefaultArgExpr * arg ) {
855 assertf( ! options.genC, "Default argument expressions should not reach code generation." );
856 arg->expr->accept( *visitor );
857 }
858
859 void CodeGenerator::postvisit( GenericExpr * expr ) {
860 assertf( ! options.genC, "C11 _Generic expressions should not reach code generation." );
861 output << "_Generic(";
862 expr->control->accept( *visitor );
863 output << ", ";
864 unsigned int numAssocs = expr->associations.size();
865 unsigned int i = 0;
866 for ( GenericExpr::Association & assoc : expr->associations ) {
867 if (assoc.isDefault) {
868 output << "default: ";
869 } else {
870 output << genType( assoc.type, "", options ) << ": ";
871 }
872 assoc.expr->accept( *visitor );
873 if ( i+1 != numAssocs ) {
874 output << ", ";
875 }
876 i++;
877 }
878 output << ")";
879 }
880
881
882 // *** Statements
883 void CodeGenerator::postvisit( CompoundStmt * compoundStmt ) {
884 std::list<Statement*> ks = compoundStmt->get_kids();
885 output << "{" << endl;
886
887 ++indent;
888
889 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
890 output << indent << printLabels( (*i)->get_labels() );
891 (*i)->accept( *visitor );
892
893 output << endl;
894 if ( wantSpacing( *i ) ) {
895 output << endl;
896 } // if
897 } // for
898 --indent;
899
900 output << indent << "}";
901 }
902
903 void CodeGenerator::postvisit( ExprStmt * exprStmt ) {
904 assert( exprStmt );
905 if ( options.genC ) {
906 // cast the top-level expression to void to reduce gcc warnings.
907 exprStmt->set_expr( new CastExpr( exprStmt->get_expr() ) );
908 }
909 exprStmt->get_expr()->accept( *visitor );
910 output << ";";
911 }
912
913 void CodeGenerator::postvisit( AsmStmt * asmStmt ) {
914 output << "asm ";
915 if ( asmStmt->get_voltile() ) output << "volatile ";
916 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
917 output << "( ";
918 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *visitor );
919 output << " : ";
920 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
921 output << " : ";
922 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
923 output << " : ";
924 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
925 if ( ! asmStmt->get_gotolabels().empty() ) {
926 output << " : ";
927 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
928 output << *begin++;
929 if ( begin == asmStmt->get_gotolabels().end() ) break;
930 output << ", ";
931 } // for
932 } // if
933 output << " );";
934 }
935
936 void CodeGenerator::postvisit( AsmDecl * asmDecl ) {
937 output << "asm ";
938 AsmStmt * asmStmt = asmDecl->get_stmt();
939 output << "( ";
940 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *visitor );
941 output << " )";
942 }
943
944 void CodeGenerator::postvisit( DirectiveDecl * directiveDecl ) {
945 output << endl << directiveDecl->get_stmt()->directive; // endl prevents spaces before directive
946 }
947
948 void CodeGenerator::postvisit( DirectiveStmt * dirStmt ) {
949 output << endl << dirStmt->directive; // endl prevents spaces before directive
950 }
951
952 void CodeGenerator::postvisit( IfStmt * ifStmt ) {
953 output << "if ( ";
954 ifStmt->get_condition()->accept( *visitor );
955 output << " ) ";
956
957 ifStmt->get_thenPart()->accept( *visitor );
958
959 if ( ifStmt->get_elsePart() != 0) {
960 output << " else ";
961 ifStmt->get_elsePart()->accept( *visitor );
962 } // if
963 }
964
965 void CodeGenerator::postvisit( SwitchStmt * switchStmt ) {
966 output << "switch ( ";
967 switchStmt->get_condition()->accept( *visitor );
968 output << " ) ";
969
970 output << "{" << endl;
971 ++indent;
972 acceptAll( switchStmt->get_statements(), *visitor );
973 --indent;
974 output << indent << "}";
975 }
976
977 void CodeGenerator::postvisit( CaseStmt * caseStmt ) {
978 updateLocation( caseStmt );
979 output << indent;
980 if ( caseStmt->isDefault()) {
981 output << "default";
982 } else {
983 output << "case ";
984 caseStmt->get_condition()->accept( *visitor );
985 } // if
986 output << ":" << endl;
987
988 std::list<Statement *> sts = caseStmt->get_statements();
989
990 ++indent;
991 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
992 output << indent << printLabels( (*i)->get_labels() ) ;
993 (*i)->accept( *visitor );
994 output << endl;
995 } // for
996 --indent;
997 }
998
999 void CodeGenerator::postvisit( BranchStmt * branchStmt ) {
1000 switch ( branchStmt->get_type()) {
1001 case BranchStmt::Goto:
1002 if ( ! branchStmt->get_target().empty() )
1003 output << "goto " << branchStmt->get_target();
1004 else {
1005 if ( branchStmt->get_computedTarget() != 0 ) {
1006 output << "goto *";
1007 branchStmt->get_computedTarget()->accept( *visitor );
1008 } // if
1009 } // if
1010 break;
1011 case BranchStmt::Break:
1012 output << "break";
1013 break;
1014 case BranchStmt::Continue:
1015 output << "continue";
1016 break;
1017 case BranchStmt::FallThrough:
1018 case BranchStmt::FallThroughDefault:
1019 assertf( ! options.genC, "fallthru should not reach code generation." );
1020 output << "fallthru";
1021 break;
1022 } // switch
1023 // print branch target for labelled break/continue/fallthru in debug mode
1024 if ( ! options.genC && branchStmt->get_type() != BranchStmt::Goto ) {
1025 if ( ! branchStmt->get_target().empty() ) {
1026 output << " " << branchStmt->get_target();
1027 } else if ( branchStmt->get_type() == BranchStmt::FallThrough ) {
1028 output << " default";
1029 }
1030 }
1031 output << ";";
1032 }
1033
1034 void CodeGenerator::postvisit( ReturnStmt * returnStmt ) {
1035 output << "return ";
1036 maybeAccept( returnStmt->get_expr(), *visitor );
1037 output << ";";
1038 }
1039
1040 void CodeGenerator::postvisit( ThrowStmt * throwStmt ) {
1041 assertf( ! options.genC, "Throw statements should not reach code generation." );
1042
1043 output << ((throwStmt->get_kind() == ThrowStmt::Terminate) ?
1044 "throw" : "throwResume");
1045 if (throwStmt->get_expr()) {
1046 output << " ";
1047 throwStmt->get_expr()->accept( *visitor );
1048 }
1049 if (throwStmt->get_target()) {
1050 output << " _At ";
1051 throwStmt->get_target()->accept( *visitor );
1052 }
1053 output << ";";
1054 }
1055 void CodeGenerator::postvisit( CatchStmt * stmt ) {
1056 assertf( ! options.genC, "Catch statements should not reach code generation." );
1057
1058 output << ((stmt->get_kind() == CatchStmt::Terminate) ?
1059 "catch" : "catchResume");
1060 output << "( ";
1061 stmt->decl->accept( *visitor );
1062 output << " ) ";
1063
1064 if( stmt->cond ) {
1065 output << "if/when(?) (";
1066 stmt->cond->accept( *visitor );
1067 output << ") ";
1068 }
1069 stmt->body->accept( *visitor );
1070 }
1071
1072 void CodeGenerator::postvisit( WaitForStmt * stmt ) {
1073 assertf( ! options.genC, "Waitfor statements should not reach code generation." );
1074
1075 bool first = true;
1076 for( auto & clause : stmt->clauses ) {
1077 if(first) { output << "or "; first = false; }
1078 if( clause.condition ) {
1079 output << "when(";
1080 stmt->timeout.condition->accept( *visitor );
1081 output << ") ";
1082 }
1083 output << "waitfor(";
1084 clause.target.function->accept( *visitor );
1085 for( Expression * expr : clause.target.arguments ) {
1086 output << ",";
1087 expr->accept( *visitor );
1088 }
1089 output << ") ";
1090 clause.statement->accept( *visitor );
1091 }
1092
1093 if( stmt->timeout.statement ) {
1094 output << "or ";
1095 if( stmt->timeout.condition ) {
1096 output << "when(";
1097 stmt->timeout.condition->accept( *visitor );
1098 output << ") ";
1099 }
1100 output << "timeout(";
1101 stmt->timeout.time->accept( *visitor );
1102 output << ") ";
1103 stmt->timeout.statement->accept( *visitor );
1104 }
1105
1106 if( stmt->orelse.statement ) {
1107 output << "or ";
1108 if( stmt->orelse.condition ) {
1109 output << "when(";
1110 stmt->orelse.condition->accept( *visitor );
1111 output << ")";
1112 }
1113 output << "else ";
1114 stmt->orelse.statement->accept( *visitor );
1115 }
1116 }
1117
1118 void CodeGenerator::postvisit( WithStmt * with ) {
1119 if ( ! options.genC ) {
1120 output << "with ( ";
1121 genCommaList( with->exprs.begin(), with->exprs.end() );
1122 output << " ) ";
1123 }
1124 with->stmt->accept( *visitor );
1125 }
1126
1127 void CodeGenerator::postvisit( WhileStmt * whileStmt ) {
1128 if ( whileStmt->get_isDoWhile() ) {
1129 output << "do";
1130 } else {
1131 output << "while (";
1132 whileStmt->get_condition()->accept( *visitor );
1133 output << ")";
1134 } // if
1135 output << " ";
1136
1137 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
1138 whileStmt->get_body()->accept( *visitor );
1139
1140 output << indent;
1141
1142 if ( whileStmt->get_isDoWhile() ) {
1143 output << " while (";
1144 whileStmt->get_condition()->accept( *visitor );
1145 output << ");";
1146 } // if
1147 }
1148
1149 void CodeGenerator::postvisit( ForStmt * forStmt ) {
1150 // initialization is always hoisted, so don't bother doing anything with that
1151 output << "for (;";
1152
1153 if ( forStmt->get_condition() != 0 ) {
1154 forStmt->get_condition()->accept( *visitor );
1155 } // if
1156 output << ";";
1157
1158 if ( forStmt->get_increment() != 0 ) {
1159 // cast the top-level expression to void to reduce gcc warnings.
1160 Expression * expr = new CastExpr( forStmt->get_increment() );
1161 expr->accept( *visitor );
1162 } // if
1163 output << ") ";
1164
1165 if ( forStmt->get_body() != 0 ) {
1166 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
1167 forStmt->get_body()->accept( *visitor );
1168 } // if
1169 }
1170
1171 void CodeGenerator::postvisit( __attribute__((unused)) NullStmt * nullStmt ) {
1172 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
1173 output << "/* null statement */ ;";
1174 }
1175
1176 void CodeGenerator::postvisit( DeclStmt * declStmt ) {
1177 declStmt->get_decl()->accept( *visitor );
1178
1179 if ( doSemicolon( declStmt->get_decl() ) ) {
1180 output << ";";
1181 } // if
1182 }
1183
1184 void CodeGenerator::postvisit( ImplicitCtorDtorStmt * stmt ) {
1185 assertf( ! options.genC, "ImplicitCtorDtorStmts should not reach code generation." );
1186 stmt->callStmt->accept( *visitor );
1187 }
1188
1189 void CodeGenerator::postvisit( MutexStmt * stmt ) {
1190 assertf( ! options.genC, "ImplicitCtorDtorStmts should not reach code generation." );
1191 stmt->stmt->accept( *visitor );
1192 }
1193
1194 void CodeGenerator::handleStorageClass( DeclarationWithType * decl ) {
1195 if ( decl->get_storageClasses().any() ) {
1196 decl->get_storageClasses().print( output );
1197 } // if
1198 } // CodeGenerator::handleStorageClass
1199
1200 std::string genName( DeclarationWithType * decl ) {
1201 const OperatorInfo * opInfo = operatorLookup( decl->get_name() );
1202 if ( opInfo ) {
1203 return opInfo->outputName;
1204 } else {
1205 return decl->get_name();
1206 } // if
1207 }
1208} // namespace CodeGen
1209
1210
1211unsigned Indenter::tabsize = 2;
1212
1213std::ostream & operator<<( std::ostream & out, const BaseSyntaxNode * node ) {
1214 if ( node ) {
1215 node->print( out );
1216 } else {
1217 out << "nullptr";
1218 }
1219 return out;
1220}
1221
1222// Local Variables: //
1223// tab-width: 4 //
1224// mode: c++ //
1225// compile-command: "make install" //
1226// End: //
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