source: src/CodeGen/CodeGenerator.cc@ 36982fc

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new with_gc
Last change on this file since 36982fc was f0ecf9b, checked in by Rob Schluntz <rschlunt@…>, 8 years ago

Remove TypeDecl::Any, as it is subsumed by Dtype+sized
  • Property mode set to 100644
File size: 33.6 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 : Sun Sep 3 20:42:52 2017
13// Update Count : 490
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/SemanticError.h" // for SemanticError
21#include "Common/UniqueName.h" // for UniqueName
22#include "Common/utility.h" // for CodeLocation, toString
23#include "GenType.h" // for genType
24#include "InitTweak/InitTweak.h" // for getPointerBase
25#include "OperatorTable.h" // for OperatorInfo, operatorLookup
26#include "Parser/LinkageSpec.h" // for Spec, Intrinsic
27#include "SynTree/Attribute.h" // for Attribute
28#include "SynTree/BaseSyntaxNode.h" // for BaseSyntaxNode
29#include "SynTree/Constant.h" // for Constant
30#include "SynTree/Declaration.h" // for DeclarationWithType, TypeDecl
31#include "SynTree/Expression.h" // for Expression, UntypedExpr, Applica...
32#include "SynTree/Initializer.h" // for Initializer, ListInit, Designation
33#include "SynTree/Label.h" // for Label, operator<<
34#include "SynTree/Statement.h" // for Statement, AsmStmt, BranchStmt
35#include "SynTree/Type.h" // for Type, Type::StorageClasses, Func...
36
37using namespace std;
38
39namespace CodeGen {
40 int CodeGenerator::tabsize = 4;
41
42 // the kinds of statements that would ideally be followed by whitespace
43 bool wantSpacing( Statement * stmt) {
44 return dynamic_cast< IfStmt * >( stmt ) || dynamic_cast< CompoundStmt * >( stmt ) ||
45 dynamic_cast< WhileStmt * >( stmt ) || dynamic_cast< ForStmt * >( stmt ) || dynamic_cast< SwitchStmt *>( stmt );
46 }
47
48 void CodeGenerator::extension( Expression * expr ) {
49 if ( expr->get_extension() ) {
50 output << "__extension__ ";
51 } // if
52 } // extension
53
54 void CodeGenerator::extension( Declaration * decl ) {
55 if ( decl->get_extension() ) {
56 output << "__extension__ ";
57 } // if
58 } // extension
59
60 void CodeGenerator::asmName( DeclarationWithType * decl ) {
61 if ( ConstantExpr * asmName = dynamic_cast<ConstantExpr *>(decl->get_asmName()) ) {
62 output << " asm ( " << asmName->get_constant()->get_value() << " )";
63 } // if
64 } // extension
65
66 CodeGenerator::LabelPrinter & CodeGenerator::LabelPrinter::operator()( std::list< Label > & l ) {
67 labels = &l;
68 return *this;
69 }
70
71 ostream & operator<<( ostream & output, CodeGenerator::LabelPrinter & printLabels ) {
72 std::list< Label > & labs = *printLabels.labels;
73 // l.unique(); // assumes a sorted list. Why not use set? Does order matter?
74 for ( Label & l : labs ) {
75 output << l.get_name() + ": ";
76 printLabels.cg.genAttributes( l.get_attributes() );
77 } // for
78 return output;
79 }
80
81 /* Using updateLocation at the beginning of a node and endl
82 * within a node should become the method of formating.
83 */
84 void CodeGenerator::updateLocation( CodeLocation const & to ) {
85 // skip if linemarks shouldn't appear or if codelocation is unset
86 if ( !lineMarks || to.isUnset() ) return;
87
88 if ( currentLocation.followedBy( to, 0 ) ) {
89 return;
90 } else if ( currentLocation.followedBy( to, 1 ) ) {
91 output << "\n" << indent;
92 currentLocation.first_line += 1;
93 } else if ( currentLocation.followedBy( to, 2 ) ) {
94 output << "\n\n" << indent;
95 currentLocation.first_line += 2;
96 } else {
97 output << "\n# " << to.first_line << " \"" << to.filename
98 << "\"\n" << indent;
99 currentLocation = to;
100 }
101 output << std::flush;
102 }
103
104 void CodeGenerator::updateLocation( BaseSyntaxNode const * to ) {
105 updateLocation( to->location );
106 }
107
108 // replace endl
109 ostream & CodeGenerator::LineEnder::operator()( ostream & os ) const {
110 // if ( !cg.lineMarks ) {
111 // os << "\n" << cg.indent << std::flush;
112 // }
113 os << "\n" << std::flush;
114 cg.currentLocation.first_line++;
115 // os << "/* did endl; current loc is: " << cg.currentLocation.first_line << "*/";
116 return os;
117 }
118
119 CodeGenerator::CodeGenerator( std::ostream & os, bool pretty, bool genC, bool lineMarks ) : indent( CodeGenerator::tabsize ), output( os ), printLabels( *this ), pretty( pretty ), genC( genC ), lineMarks( lineMarks ), endl( *this ) {}
120
121 string CodeGenerator::mangleName( DeclarationWithType * decl ) {
122 if ( pretty ) return decl->get_name();
123 if ( decl->get_mangleName() != "" ) {
124 // need to incorporate scope level in order to differentiate names for destructors
125 return decl->get_scopedMangleName();
126 } else {
127 return decl->get_name();
128 } // if
129 }
130
131 void CodeGenerator::genAttributes( list< Attribute * > & attributes ) {
132 if ( attributes.empty() ) return;
133 output << "__attribute__ ((";
134 for ( list< Attribute * >::iterator attr( attributes.begin() );; ) {
135 output << (*attr)->get_name();
136 if ( ! (*attr)->get_parameters().empty() ) {
137 output << "(";
138 genCommaList( (*attr)->get_parameters().begin(), (*attr)->get_parameters().end() );
139 output << ")";
140 } // if
141 if ( ++attr == attributes.end() ) break;
142 output << ","; // separator
143 } // for
144 output << ")) ";
145 } // CodeGenerator::genAttributes
146
147 // *** BaseSyntaxNode
148 void CodeGenerator::previsit( BaseSyntaxNode * node ) {
149 // turn off automatic recursion for all nodes, to allow each visitor to
150 // precisely control the order in which its children are visited.
151 visit_children = false;
152 updateLocation( node );
153 }
154
155 // *** BaseSyntaxNode
156 void CodeGenerator::postvisit( BaseSyntaxNode * node ) {
157 std::stringstream ss;
158 node->print( ss );
159 assertf( false, "Unhandled node reached in CodeGenerator: %s", ss.str().c_str() );
160 }
161
162 // *** Declarations
163 void CodeGenerator::postvisit( FunctionDecl * functionDecl ) {
164 extension( functionDecl );
165 genAttributes( functionDecl->get_attributes() );
166
167 handleStorageClass( functionDecl );
168 functionDecl->get_funcSpec().print( output );
169
170 output << genType( functionDecl->get_functionType(), mangleName( functionDecl ), pretty, genC );
171
172 asmName( functionDecl );
173
174 if ( functionDecl->get_statements() ) {
175 functionDecl->get_statements()->accept( *visitor );
176 } // if
177 }
178
179 void CodeGenerator::postvisit( ObjectDecl * objectDecl ) {
180 if (objectDecl->get_name().empty() && genC ) {
181 // only generate an anonymous name when generating C code, otherwise it clutters the output too much
182 static UniqueName name = { "__anonymous_object" };
183 objectDecl->set_name( name.newName() );
184 }
185
186 extension( objectDecl );
187 genAttributes( objectDecl->get_attributes() );
188
189 handleStorageClass( objectDecl );
190 output << genType( objectDecl->get_type(), mangleName( objectDecl ), pretty, genC );
191
192 asmName( objectDecl );
193
194 if ( objectDecl->get_init() ) {
195 output << " = ";
196 objectDecl->get_init()->accept( *visitor );
197 } // if
198
199 if ( objectDecl->get_bitfieldWidth() ) {
200 output << ":";
201 objectDecl->get_bitfieldWidth()->accept( *visitor );
202 } // if
203 }
204
205 void CodeGenerator::handleAggregate( AggregateDecl * aggDecl, const std::string & kind ) {
206 genAttributes( aggDecl->get_attributes() );
207
208 if( ! aggDecl->get_parameters().empty() && ! genC ) {
209 // assertf( ! genC, "Aggregate type parameters should not reach code generation." );
210 output << "forall(";
211 genCommaList( aggDecl->get_parameters().begin(), aggDecl->get_parameters().end() );
212 output << ")" << endl;
213 output << indent;
214 }
215
216 output << kind << aggDecl->get_name();
217
218 if ( aggDecl->has_body() ) {
219 std::list< Declaration * > & memb = aggDecl->get_members();
220 output << " {" << endl;
221
222 ++indent;
223 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
224 output << indent;
225 (*i)->accept( *visitor );
226 output << ";" << endl;
227 } // for
228
229 --indent;
230
231 output << indent << "}";
232 } // if
233 }
234
235 void CodeGenerator::postvisit( StructDecl * structDecl ) {
236 extension( structDecl );
237 handleAggregate( structDecl, "struct " );
238 }
239
240 void CodeGenerator::postvisit( UnionDecl * unionDecl ) {
241 extension( unionDecl );
242 handleAggregate( unionDecl, "union " );
243 }
244
245 void CodeGenerator::postvisit( EnumDecl * enumDecl ) {
246 extension( enumDecl );
247 output << "enum ";
248 genAttributes( enumDecl->get_attributes() );
249
250 output << enumDecl->get_name();
251
252 std::list< Declaration* > &memb = enumDecl->get_members();
253
254 if ( ! memb.empty() ) {
255 output << " {" << endl;
256
257 ++indent;
258 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
259 ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
260 assert( obj );
261 output << indent << mangleName( obj );
262 if ( obj->get_init() ) {
263 output << " = ";
264 obj->get_init()->accept( *visitor );
265 } // if
266 output << "," << endl;
267 } // for
268
269 --indent;
270
271 output << indent << "}";
272 } // if
273 }
274
275 void CodeGenerator::postvisit( TraitDecl * traitDecl ) {
276 assertf( ! genC, "TraitDecls should not reach code generation." );
277 extension( traitDecl );
278 handleAggregate( traitDecl, "trait " );
279 }
280
281 void CodeGenerator::postvisit( TypedefDecl * typeDecl ) {
282 assertf( ! genC, "Typedefs are removed and substituted in earlier passes." );
283 output << "typedef ";
284 output << genType( typeDecl->get_base(), typeDecl->get_name(), pretty, genC ) << endl;
285 }
286
287 void CodeGenerator::postvisit( TypeDecl * typeDecl ) {
288 assertf( ! genC, "TypeDecls should not reach code generation." );
289 output << typeDecl->genTypeString() << " " << typeDecl->name;
290 if ( typeDecl->sized ) {
291 output << " | sized(" << typeDecl->name << ")";
292 }
293 if ( ! typeDecl->assertions.empty() ) {
294 output << " | { ";
295 for ( DeclarationWithType * assert : typeDecl->assertions ) {
296 assert->accept( *visitor );
297 output << "; ";
298 }
299 output << " }";
300 }
301 }
302
303 void CodeGenerator::postvisit( Designation * designation ) {
304 std::list< Expression * > designators = designation->get_designators();
305 if ( designators.size() == 0 ) return;
306 for ( Expression * des : designators ) {
307 if ( dynamic_cast< NameExpr * >( des ) || dynamic_cast< VariableExpr * >( des ) ) {
308 // if expression is a NameExpr or VariableExpr, then initializing aggregate member
309 output << ".";
310 des->accept( *visitor );
311 } else {
312 // otherwise, it has to be a ConstantExpr or CastExpr, initializing array eleemnt
313 output << "[";
314 des->accept( *visitor );
315 output << "]";
316 } // if
317 } // for
318 output << " = ";
319 }
320
321 void CodeGenerator::postvisit( SingleInit * init ) {
322 init->get_value()->accept( *visitor );
323 }
324
325 void CodeGenerator::postvisit( ListInit * init ) {
326 auto initBegin = init->begin();
327 auto initEnd = init->end();
328 auto desigBegin = init->get_designations().begin();
329 auto desigEnd = init->get_designations().end();
330
331 output << "{ ";
332 for ( ; initBegin != initEnd && desigBegin != desigEnd; ) {
333 (*desigBegin)->accept( *visitor );
334 (*initBegin)->accept( *visitor );
335 ++initBegin, ++desigBegin;
336 if ( initBegin != initEnd ) {
337 output << ", ";
338 }
339 }
340 output << " }";
341 assertf( initBegin == initEnd && desigBegin == desigEnd, "Initializers and designators not the same length. %s", toString( init ).c_str() );
342 }
343
344 void CodeGenerator::postvisit( ConstructorInit * init ){
345 assertf( ! genC, "ConstructorInit nodes should not reach code generation." );
346 // pseudo-output for constructor/destructor pairs
347 output << "<ctorinit>{" << endl << ++indent << "ctor: ";
348 maybeAccept( init->get_ctor(), *visitor );
349 output << ", " << endl << indent << "dtor: ";
350 maybeAccept( init->get_dtor(), *visitor );
351 output << endl << --indent << "}";
352 }
353
354 void CodeGenerator::postvisit( Constant * constant ) {
355 output << constant->get_value() ;
356 }
357
358 // *** Expressions
359 void CodeGenerator::postvisit( ApplicationExpr * applicationExpr ) {
360 extension( applicationExpr );
361 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
362 OperatorInfo opInfo;
363 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
364 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
365 switch ( opInfo.type ) {
366 case OT_INDEX:
367 assert( applicationExpr->get_args().size() == 2 );
368 (*arg++)->accept( *visitor );
369 output << "[";
370 (*arg)->accept( *visitor );
371 output << "]";
372 break;
373
374 case OT_CALL:
375 // there are no intrinsic definitions of the function call operator
376 assert( false );
377 break;
378
379 case OT_CTOR:
380 case OT_DTOR:
381 if ( applicationExpr->get_args().size() == 1 ) {
382 // the expression fed into a single parameter constructor or destructor may contain side
383 // effects, so must still output this expression
384 output << "(";
385 (*arg++)->accept( *visitor );
386 output << ") /* " << opInfo.inputName << " */";
387 } else if ( applicationExpr->get_args().size() == 2 ) {
388 // intrinsic two parameter constructors are essentially bitwise assignment
389 output << "(";
390 (*arg++)->accept( *visitor );
391 output << opInfo.symbol;
392 (*arg)->accept( *visitor );
393 output << ") /* " << opInfo.inputName << " */";
394 } else {
395 // no constructors with 0 or more than 2 parameters
396 assert( false );
397 } // if
398 break;
399
400 case OT_PREFIX:
401 case OT_PREFIXASSIGN:
402 assert( applicationExpr->get_args().size() == 1 );
403 output << "(";
404 output << opInfo.symbol;
405 (*arg)->accept( *visitor );
406 output << ")";
407 break;
408
409 case OT_POSTFIX:
410 case OT_POSTFIXASSIGN:
411 assert( applicationExpr->get_args().size() == 1 );
412 (*arg)->accept( *visitor );
413 output << opInfo.symbol;
414 break;
415
416
417 case OT_INFIX:
418 case OT_INFIXASSIGN:
419 assert( applicationExpr->get_args().size() == 2 );
420 output << "(";
421 (*arg++)->accept( *visitor );
422 output << opInfo.symbol;
423 (*arg)->accept( *visitor );
424 output << ")";
425 break;
426
427 case OT_CONSTANT:
428 case OT_LABELADDRESS:
429 // there are no intrinsic definitions of 0/1 or label addresses as functions
430 assert( false );
431 } // switch
432 } else {
433 varExpr->accept( *visitor );
434 output << "(";
435 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
436 output << ")";
437 } // if
438 } else {
439 applicationExpr->get_function()->accept( *visitor );
440 output << "(";
441 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
442 output << ")";
443 } // if
444 }
445
446 void CodeGenerator::postvisit( UntypedExpr * untypedExpr ) {
447 extension( untypedExpr );
448 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->function ) ) {
449 OperatorInfo opInfo;
450 if ( operatorLookup( nameExpr->name, opInfo ) ) {
451 std::list< Expression* >::iterator arg = untypedExpr->args.begin();
452 switch ( opInfo.type ) {
453 case OT_INDEX:
454 assert( untypedExpr->args.size() == 2 );
455 (*arg++)->accept( *visitor );
456 output << "[";
457 (*arg)->accept( *visitor );
458 output << "]";
459 break;
460
461 case OT_CALL:
462 assert( false );
463
464 case OT_CTOR:
465 case OT_DTOR:
466 if ( untypedExpr->args.size() == 1 ) {
467 // the expression fed into a single parameter constructor or destructor may contain side
468 // effects, so must still output this expression
469 output << "(";
470 (*arg++)->accept( *visitor );
471 output << ") /* " << opInfo.inputName << " */";
472 } else if ( untypedExpr->get_args().size() == 2 ) {
473 // intrinsic two parameter constructors are essentially bitwise assignment
474 output << "(";
475 (*arg++)->accept( *visitor );
476 output << opInfo.symbol;
477 (*arg)->accept( *visitor );
478 output << ") /* " << opInfo.inputName << " */";
479 } else {
480 // no constructors with 0 or more than 2 parameters
481 assertf( ! genC, "UntypedExpr constructor/destructor with 0 or more than 2 parameters." );
482 output << "(";
483 (*arg++)->accept( *visitor );
484 output << opInfo.symbol << "{ ";
485 genCommaList( arg, untypedExpr->args.end() );
486 output << "}) /* " << opInfo.inputName << " */";
487 } // if
488 break;
489
490 case OT_PREFIX:
491 case OT_PREFIXASSIGN:
492 case OT_LABELADDRESS:
493 assert( untypedExpr->args.size() == 1 );
494 output << "(";
495 output << opInfo.symbol;
496 (*arg)->accept( *visitor );
497 output << ")";
498 break;
499
500 case OT_POSTFIX:
501 case OT_POSTFIXASSIGN:
502 assert( untypedExpr->args.size() == 1 );
503 (*arg)->accept( *visitor );
504 output << opInfo.symbol;
505 break;
506
507 case OT_INFIX:
508 case OT_INFIXASSIGN:
509 assert( untypedExpr->args.size() == 2 );
510 output << "(";
511 (*arg++)->accept( *visitor );
512 output << opInfo.symbol;
513 (*arg)->accept( *visitor );
514 output << ")";
515 break;
516
517 case OT_CONSTANT:
518 // there are no intrinsic definitions of 0 or 1 as functions
519 assert( false );
520 } // switch
521 } else {
522 // builtin routines
523 nameExpr->accept( *visitor );
524 output << "(";
525 genCommaList( untypedExpr->args.begin(), untypedExpr->args.end() );
526 output << ")";
527 } // if
528 } else {
529 untypedExpr->function->accept( *visitor );
530 output << "(";
531 genCommaList( untypedExpr->args.begin(), untypedExpr->args.end() );
532 output << ")";
533 } // if
534 }
535
536 void CodeGenerator::postvisit( RangeExpr * rangeExpr ) {
537 rangeExpr->low->accept( *visitor );
538 output << " ... ";
539 rangeExpr->high->accept( *visitor );
540 }
541
542 void CodeGenerator::postvisit( NameExpr * nameExpr ) {
543 extension( nameExpr );
544 OperatorInfo opInfo;
545 if ( operatorLookup( nameExpr->name, opInfo ) ) {
546 if ( opInfo.type == OT_CONSTANT ) {
547 output << opInfo.symbol;
548 } else {
549 output << opInfo.outputName;
550 }
551 } else {
552 output << nameExpr->get_name();
553 } // if
554 }
555
556 void CodeGenerator::postvisit( AddressExpr * addressExpr ) {
557 extension( addressExpr );
558 output << "(&";
559 addressExpr->arg->accept( *visitor );
560 output << ")";
561 }
562
563 void CodeGenerator::postvisit( LabelAddressExpr *addressExpr ) {
564 extension( addressExpr );
565 output << "(&&" << addressExpr->arg << ")";
566 }
567
568 void CodeGenerator::postvisit( CastExpr * castExpr ) {
569 extension( castExpr );
570 output << "(";
571 if ( castExpr->get_result()->isVoid() ) {
572 output << "(void)" ;
573 } else {
574 // at least one result type of cast.
575 // Note: previously, lvalue casts were skipped. Since it's now impossible for the user to write
576 // an lvalue cast, this has been taken out.
577 output << "(";
578 output << genType( castExpr->get_result(), "", pretty, genC );
579 output << ")";
580 } // if
581 castExpr->get_arg()->accept( *visitor );
582 output << ")";
583 }
584
585 void CodeGenerator::postvisit( VirtualCastExpr * castExpr ) {
586 assertf( ! genC, "VirtualCastExpr should not reach code generation." );
587 extension( castExpr );
588 output << "(virtual ";
589 castExpr->get_arg()->accept( *visitor );
590 output << ")";
591 }
592
593 void CodeGenerator::postvisit( UntypedMemberExpr * memberExpr ) {
594 assertf( ! genC, "UntypedMemberExpr should not reach code generation." );
595 extension( memberExpr );
596 memberExpr->get_aggregate()->accept( *visitor );
597 output << ".";
598 memberExpr->get_member()->accept( *visitor );
599 }
600
601 void CodeGenerator::postvisit( MemberExpr * memberExpr ) {
602 extension( memberExpr );
603 memberExpr->get_aggregate()->accept( *visitor );
604 output << "." << mangleName( memberExpr->get_member() );
605 }
606
607 void CodeGenerator::postvisit( VariableExpr * variableExpr ) {
608 extension( variableExpr );
609 OperatorInfo opInfo;
610 if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
611 output << opInfo.symbol;
612 } else {
613 output << mangleName( variableExpr->get_var() );
614 } // if
615 }
616
617 void CodeGenerator::postvisit( ConstantExpr * constantExpr ) {
618 assert( constantExpr->get_constant() );
619 extension( constantExpr );
620 constantExpr->get_constant()->accept( *visitor );
621 }
622
623 void CodeGenerator::postvisit( SizeofExpr * sizeofExpr ) {
624 extension( sizeofExpr );
625 output << "sizeof(";
626 if ( sizeofExpr->get_isType() ) {
627 output << genType( sizeofExpr->get_type(), "", pretty, genC );
628 } else {
629 sizeofExpr->get_expr()->accept( *visitor );
630 } // if
631 output << ")";
632 }
633
634 void CodeGenerator::postvisit( AlignofExpr * alignofExpr ) {
635 // use GCC extension to avoid bumping std to C11
636 extension( alignofExpr );
637 output << "__alignof__(";
638 if ( alignofExpr->get_isType() ) {
639 output << genType( alignofExpr->get_type(), "", pretty, genC );
640 } else {
641 alignofExpr->get_expr()->accept( *visitor );
642 } // if
643 output << ")";
644 }
645
646 void CodeGenerator::postvisit( UntypedOffsetofExpr * offsetofExpr ) {
647 assertf( ! genC, "UntypedOffsetofExpr should not reach code generation." );
648 output << "offsetof(";
649 output << genType( offsetofExpr->get_type(), "", pretty, genC );
650 output << ", " << offsetofExpr->get_member();
651 output << ")";
652 }
653
654 void CodeGenerator::postvisit( OffsetofExpr * offsetofExpr ) {
655 // use GCC builtin
656 output << "__builtin_offsetof(";
657 output << genType( offsetofExpr->get_type(), "", pretty, genC );
658 output << ", " << mangleName( offsetofExpr->get_member() );
659 output << ")";
660 }
661
662 void CodeGenerator::postvisit( OffsetPackExpr * offsetPackExpr ) {
663 assertf( ! genC, "OffsetPackExpr should not reach code generation." );
664 output << "__CFA_offsetpack(" << genType( offsetPackExpr->get_type(), "", pretty, genC ) << ")";
665 }
666
667 void CodeGenerator::postvisit( LogicalExpr * logicalExpr ) {
668 extension( logicalExpr );
669 output << "(";
670 logicalExpr->get_arg1()->accept( *visitor );
671 if ( logicalExpr->get_isAnd() ) {
672 output << " && ";
673 } else {
674 output << " || ";
675 } // if
676 logicalExpr->get_arg2()->accept( *visitor );
677 output << ")";
678 }
679
680 void CodeGenerator::postvisit( ConditionalExpr * conditionalExpr ) {
681 extension( conditionalExpr );
682 output << "(";
683 conditionalExpr->get_arg1()->accept( *visitor );
684 output << " ? ";
685 conditionalExpr->get_arg2()->accept( *visitor );
686 output << " : ";
687 conditionalExpr->get_arg3()->accept( *visitor );
688 output << ")";
689 }
690
691 void CodeGenerator::postvisit( CommaExpr * commaExpr ) {
692 extension( commaExpr );
693 output << "(";
694 if ( genC ) {
695 // arg1 of a CommaExpr is never used, so it can be safely cast to void to reduce gcc warnings.
696 commaExpr->set_arg1( new CastExpr( commaExpr->get_arg1() ) );
697 }
698 commaExpr->get_arg1()->accept( *visitor );
699 output << " , ";
700 commaExpr->get_arg2()->accept( *visitor );
701 output << ")";
702 }
703
704 void CodeGenerator::postvisit( TupleAssignExpr * tupleExpr ) {
705 assertf( ! genC, "TupleAssignExpr should not reach code generation." );
706 tupleExpr->stmtExpr->accept( *visitor );
707 }
708
709 void CodeGenerator::postvisit( UntypedTupleExpr * tupleExpr ) {
710 assertf( ! genC, "UntypedTupleExpr should not reach code generation." );
711 extension( tupleExpr );
712 output << "[";
713 genCommaList( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end() );
714 output << "]";
715 }
716
717 void CodeGenerator::postvisit( TupleExpr * tupleExpr ) {
718 assertf( ! genC, "TupleExpr should not reach code generation." );
719 extension( tupleExpr );
720 output << "[";
721 genCommaList( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end() );
722 output << "]";
723 }
724
725 void CodeGenerator::postvisit( TupleIndexExpr * tupleExpr ) {
726 assertf( ! genC, "TupleIndexExpr should not reach code generation." );
727 extension( tupleExpr );
728 tupleExpr->get_tuple()->accept( *visitor );
729 output << "." << tupleExpr->get_index();
730 }
731
732 void CodeGenerator::postvisit( TypeExpr * typeExpr ) {
733 // if ( genC ) std::cerr << "typeexpr still exists: " << typeExpr << std::endl;
734 // assertf( ! genC, "TypeExpr should not reach code generation." );
735 if ( ! genC ) {
736 output<< genType( typeExpr->get_type(), "", pretty, genC );
737 }
738 }
739
740 void CodeGenerator::postvisit( AsmExpr * asmExpr ) {
741 if ( asmExpr->get_inout() ) {
742 output << "[ ";
743 asmExpr->get_inout()->accept( *visitor );
744 output << " ] ";
745 } // if
746 asmExpr->get_constraint()->accept( *visitor );
747 output << " ( ";
748 asmExpr->get_operand()->accept( *visitor );
749 output << " )";
750 }
751
752 void CodeGenerator::postvisit( CompoundLiteralExpr *compLitExpr ) {
753 assert( compLitExpr->get_result() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
754 output << "(" << genType( compLitExpr->get_result(), "", pretty, genC ) << ")";
755 compLitExpr->get_initializer()->accept( *visitor );
756 }
757
758 void CodeGenerator::postvisit( UniqueExpr * unqExpr ) {
759 assertf( ! genC, "Unique expressions should not reach code generation." );
760 output << "unq<" << unqExpr->get_id() << ">{ ";
761 unqExpr->get_expr()->accept( *visitor );
762 output << " }";
763 }
764
765 void CodeGenerator::postvisit( StmtExpr * stmtExpr ) {
766 std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
767 output << "({" << endl;
768 ++indent;
769 unsigned int numStmts = stmts.size();
770 unsigned int i = 0;
771 for ( Statement * stmt : stmts ) {
772 output << indent << printLabels( stmt->get_labels() );
773 if ( i+1 == numStmts ) {
774 // last statement in a statement expression needs to be handled specially -
775 // cannot cast to void, otherwise the expression statement has no value
776 if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
777 exprStmt->get_expr()->accept( *visitor );
778 output << ";" << endl;
779 ++i;
780 break;
781 }
782 }
783 stmt->accept( *visitor );
784 output << endl;
785 if ( wantSpacing( stmt ) ) {
786 output << endl;
787 } // if
788 ++i;
789 }
790 --indent;
791 output << indent << "})";
792 }
793
794 void CodeGenerator::postvisit( ConstructorExpr * expr ) {
795 assertf( ! genC, "Unique expressions should not reach code generation." );
796 expr->callExpr->accept( *visitor );
797 }
798
799 // *** Statements
800 void CodeGenerator::postvisit( CompoundStmt * compoundStmt ) {
801 std::list<Statement*> ks = compoundStmt->get_kids();
802 output << "{" << endl;
803
804 ++indent;
805
806 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
807 output << indent << printLabels( (*i)->get_labels() );
808 (*i)->accept( *visitor );
809
810 output << endl;
811 if ( wantSpacing( *i ) ) {
812 output << endl;
813 } // if
814 } // for
815 --indent;
816
817 output << indent << "}";
818 }
819
820 void CodeGenerator::postvisit( ExprStmt * exprStmt ) {
821 assert( exprStmt );
822 if ( genC ) {
823 // cast the top-level expression to void to reduce gcc warnings.
824 exprStmt->set_expr( new CastExpr( exprStmt->get_expr() ) );
825 }
826 exprStmt->get_expr()->accept( *visitor );
827 output << ";";
828 }
829
830 void CodeGenerator::postvisit( AsmStmt * asmStmt ) {
831 output << "asm ";
832 if ( asmStmt->get_voltile() ) output << "volatile ";
833 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
834 output << "( ";
835 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *visitor );
836 output << " : ";
837 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
838 output << " : ";
839 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
840 output << " : ";
841 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
842 if ( ! asmStmt->get_gotolabels().empty() ) {
843 output << " : ";
844 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
845 output << *begin++;
846 if ( begin == asmStmt->get_gotolabels().end() ) break;
847 output << ", ";
848 } // for
849 } // if
850 output << " );" ;
851 }
852
853 void CodeGenerator::postvisit( AsmDecl * asmDecl ) {
854 output << "asm ";
855 AsmStmt * asmStmt = asmDecl->get_stmt();
856 output << "( ";
857 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *visitor );
858 output << " )" ;
859 }
860
861 void CodeGenerator::postvisit( IfStmt * ifStmt ) {
862 output << "if ( ";
863 ifStmt->get_condition()->accept( *visitor );
864 output << " ) ";
865
866 ifStmt->get_thenPart()->accept( *visitor );
867
868 if ( ifStmt->get_elsePart() != 0) {
869 output << " else ";
870 ifStmt->get_elsePart()->accept( *visitor );
871 } // if
872 }
873
874 void CodeGenerator::postvisit( SwitchStmt * switchStmt ) {
875 output << "switch ( " ;
876 switchStmt->get_condition()->accept( *visitor );
877 output << " ) ";
878
879 output << "{" << endl;
880 ++indent;
881 acceptAll( switchStmt->get_statements(), *visitor );
882 --indent;
883 output << indent << "}";
884 }
885
886 void CodeGenerator::postvisit( CaseStmt * caseStmt ) {
887 updateLocation( caseStmt );
888 output << indent;
889 if ( caseStmt->isDefault()) {
890 output << "default";
891 } else {
892 output << "case ";
893 caseStmt->get_condition()->accept( *visitor );
894 } // if
895 output << ":" << endl;
896
897 std::list<Statement *> sts = caseStmt->get_statements();
898
899 ++indent;
900 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
901 output << indent << printLabels( (*i)->get_labels() ) ;
902 (*i)->accept( *visitor );
903 output << endl;
904 } // for
905 --indent;
906 }
907
908 void CodeGenerator::postvisit( BranchStmt * branchStmt ) {
909 switch ( branchStmt->get_type()) {
910 case BranchStmt::Goto:
911 if ( ! branchStmt->get_target().empty() )
912 output << "goto " << branchStmt->get_target();
913 else {
914 if ( branchStmt->get_computedTarget() != 0 ) {
915 output << "goto *";
916 branchStmt->get_computedTarget()->accept( *visitor );
917 } // if
918 } // if
919 break;
920 case BranchStmt::Break:
921 output << "break";
922 break;
923 case BranchStmt::Continue:
924 output << "continue";
925 break;
926 } // switch
927 output << ";";
928 }
929
930 void CodeGenerator::postvisit( ReturnStmt * returnStmt ) {
931 output << "return ";
932 maybeAccept( returnStmt->get_expr(), *visitor );
933 output << ";";
934 }
935
936 void CodeGenerator::postvisit( ThrowStmt * throwStmt ) {
937 assertf( ! genC, "Throw statements should not reach code generation." );
938
939 output << ((throwStmt->get_kind() == ThrowStmt::Terminate) ?
940 "throw" : "throwResume");
941 if (throwStmt->get_expr()) {
942 output << " ";
943 throwStmt->get_expr()->accept( *visitor );
944 }
945 if (throwStmt->get_target()) {
946 output << " _At ";
947 throwStmt->get_target()->accept( *visitor );
948 }
949 output << ";";
950 }
951 void CodeGenerator::postvisit( CatchStmt * stmt ) {
952 assertf( ! genC, "Catch statements should not reach code generation." );
953
954 output << ((stmt->get_kind() == CatchStmt::Terminate) ?
955 "catch" : "catchResume");
956 output << "( ";
957 stmt->decl->accept( *visitor );
958 output << " ) ";
959
960 if( stmt->cond ) {
961 output << "if/when(?) (";
962 stmt->cond->accept( *visitor );
963 output << ") ";
964 }
965 stmt->body->accept( *visitor );
966 }
967
968 void CodeGenerator::postvisit( WaitForStmt * stmt ) {
969 assertf( ! genC, "Waitfor statements should not reach code generation." );
970
971 bool first = true;
972 for( auto & clause : stmt->clauses ) {
973 if(first) { output << "or "; first = false; }
974 if( clause.condition ) {
975 output << "when(";
976 stmt->timeout.condition->accept( *visitor );
977 output << ") ";
978 }
979 output << "waitfor(";
980 clause.target.function->accept( *visitor );
981 for( Expression * expr : clause.target.arguments ) {
982 output << ",";
983 expr->accept( *visitor );
984 }
985 output << ") ";
986 clause.statement->accept( *visitor );
987 }
988
989 if( stmt->timeout.statement ) {
990 output << "or ";
991 if( stmt->timeout.condition ) {
992 output << "when(";
993 stmt->timeout.condition->accept( *visitor );
994 output << ") ";
995 }
996 output << "timeout(";
997 stmt->timeout.time->accept( *visitor );
998 output << ") ";
999 stmt->timeout.statement->accept( *visitor );
1000 }
1001
1002 if( stmt->orelse.statement ) {
1003 output << "or ";
1004 if( stmt->orelse.condition ) {
1005 output << "when(";
1006 stmt->orelse.condition->accept( *visitor );
1007 output << ")";
1008 }
1009 output << "else ";
1010 stmt->orelse.statement->accept( *visitor );
1011 }
1012 }
1013
1014
1015 void CodeGenerator::postvisit( WhileStmt * whileStmt ) {
1016 if ( whileStmt->get_isDoWhile() ) {
1017 output << "do" ;
1018 } else {
1019 output << "while (" ;
1020 whileStmt->get_condition()->accept( *visitor );
1021 output << ")";
1022 } // if
1023 output << " ";
1024
1025 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
1026 whileStmt->get_body()->accept( *visitor );
1027
1028 output << indent;
1029
1030 if ( whileStmt->get_isDoWhile() ) {
1031 output << " while (" ;
1032 whileStmt->get_condition()->accept( *visitor );
1033 output << ");";
1034 } // if
1035 }
1036
1037 void CodeGenerator::postvisit( ForStmt * forStmt ) {
1038 // initialization is always hoisted, so don't bother doing anything with that
1039 output << "for (;";
1040
1041 if ( forStmt->get_condition() != 0 ) {
1042 forStmt->get_condition()->accept( *visitor );
1043 } // if
1044 output << ";";
1045
1046 if ( forStmt->get_increment() != 0 ) {
1047 // cast the top-level expression to void to reduce gcc warnings.
1048 Expression * expr = new CastExpr( forStmt->get_increment() );
1049 expr->accept( *visitor );
1050 } // if
1051 output << ") ";
1052
1053 if ( forStmt->get_body() != 0 ) {
1054 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
1055 forStmt->get_body()->accept( *visitor );
1056 } // if
1057 }
1058
1059 void CodeGenerator::postvisit( __attribute__((unused)) NullStmt * nullStmt ) {
1060 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
1061 output << "/* null statement */ ;";
1062 }
1063
1064 void CodeGenerator::postvisit( DeclStmt * declStmt ) {
1065 declStmt->get_decl()->accept( *visitor );
1066
1067 if ( doSemicolon( declStmt->get_decl() ) ) {
1068 output << ";";
1069 } // if
1070 }
1071
1072 void CodeGenerator::postvisit( ImplicitCtorDtorStmt * stmt ) {
1073 assertf( ! genC, "ImplicitCtorDtorStmts should not reach code generation." );
1074 stmt->callStmt->accept( *visitor );
1075 }
1076
1077 void CodeGenerator::handleStorageClass( DeclarationWithType * decl ) {
1078 if ( decl->get_storageClasses().any() ) {
1079 decl->get_storageClasses().print( output );
1080 } // if
1081 } // CodeGenerator::handleStorageClass
1082
1083 std::string genName( DeclarationWithType * decl ) {
1084 CodeGen::OperatorInfo opInfo;
1085 if ( operatorLookup( decl->get_name(), opInfo ) ) {
1086 return opInfo.outputName;
1087 } else {
1088 return decl->get_name();
1089 } // if
1090 }
1091} // namespace CodeGen
1092
1093
1094unsigned Indenter::tabsize = 2;
1095
1096std::ostream & operator<<( std::ostream & out, const BaseSyntaxNode * node ) {
1097 if ( node ) {
1098 node->print( out );
1099 } else {
1100 out << "nullptr";
1101 }
1102 return out;
1103}
1104
1105// Local Variables: //
1106// tab-width: 4 //
1107// mode: c++ //
1108// compile-command: "make install" //
1109// End: //
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