source: src/CodeGen/CodeGenerator.cc@ 4dfa562

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 4dfa562 was f980549, checked in by Thierry Delisle <tdelisle@…>, 8 years ago

Merge branch 'master' of plg.uwaterloo.ca:software/cfa/cfa-cc
  • Property mode set to 100644
File size: 32.3 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->get_name();
290 if ( typeDecl->get_kind() != TypeDecl::Any && typeDecl->get_sized() ) {
291 output << " | sized(" << typeDecl->get_name() << ")";
292 }
293 if ( ! typeDecl->get_assertions().empty() ) {
294 output << " | { ";
295 genCommaList( typeDecl->get_assertions().begin(), typeDecl->get_assertions().end() );
296 output << " }";
297 }
298 }
299
300 void CodeGenerator::postvisit( Designation * designation ) {
301 std::list< Expression * > designators = designation->get_designators();
302 if ( designators.size() == 0 ) return;
303 for ( Expression * des : designators ) {
304 if ( dynamic_cast< NameExpr * >( des ) || dynamic_cast< VariableExpr * >( des ) ) {
305 // if expression is a NameExpr or VariableExpr, then initializing aggregate member
306 output << ".";
307 des->accept( *visitor );
308 } else {
309 // otherwise, it has to be a ConstantExpr or CastExpr, initializing array eleemnt
310 output << "[";
311 des->accept( *visitor );
312 output << "]";
313 } // if
314 } // for
315 output << " = ";
316 }
317
318 void CodeGenerator::postvisit( SingleInit * init ) {
319 init->get_value()->accept( *visitor );
320 }
321
322 void CodeGenerator::postvisit( ListInit * init ) {
323 auto initBegin = init->begin();
324 auto initEnd = init->end();
325 auto desigBegin = init->get_designations().begin();
326 auto desigEnd = init->get_designations().end();
327
328 output << "{ ";
329 for ( ; initBegin != initEnd && desigBegin != desigEnd; ) {
330 (*desigBegin)->accept( *visitor );
331 (*initBegin)->accept( *visitor );
332 ++initBegin, ++desigBegin;
333 if ( initBegin != initEnd ) {
334 output << ", ";
335 }
336 }
337 output << " }";
338 assertf( initBegin == initEnd && desigBegin == desigEnd, "Initializers and designators not the same length. %s", toString( init ).c_str() );
339 }
340
341 void CodeGenerator::postvisit( ConstructorInit * init ){
342 assertf( ! genC, "ConstructorInit nodes should not reach code generation." );
343 // pseudo-output for constructor/destructor pairs
344 output << "<ctorinit>{" << endl << ++indent << "ctor: ";
345 maybeAccept( init->get_ctor(), *visitor );
346 output << ", " << endl << indent << "dtor: ";
347 maybeAccept( init->get_dtor(), *visitor );
348 output << endl << --indent << "}";
349 }
350
351 void CodeGenerator::postvisit( Constant * constant ) {
352 output << constant->get_value() ;
353 }
354
355 // *** Expressions
356 void CodeGenerator::postvisit( ApplicationExpr * applicationExpr ) {
357 extension( applicationExpr );
358 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
359 OperatorInfo opInfo;
360 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
361 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
362 switch ( opInfo.type ) {
363 case OT_INDEX:
364 assert( applicationExpr->get_args().size() == 2 );
365 (*arg++)->accept( *visitor );
366 output << "[";
367 (*arg)->accept( *visitor );
368 output << "]";
369 break;
370
371 case OT_CALL:
372 // there are no intrinsic definitions of the function call operator
373 assert( false );
374 break;
375
376 case OT_CTOR:
377 case OT_DTOR:
378 if ( applicationExpr->get_args().size() == 1 ) {
379 // the expression fed into a single parameter constructor or destructor may contain side
380 // effects, so must still output this expression
381 output << "(";
382 (*arg++)->accept( *visitor );
383 output << ") /* " << opInfo.inputName << " */";
384 } else if ( applicationExpr->get_args().size() == 2 ) {
385 // intrinsic two parameter constructors are essentially bitwise assignment
386 output << "(";
387 (*arg++)->accept( *visitor );
388 output << opInfo.symbol;
389 (*arg)->accept( *visitor );
390 output << ") /* " << opInfo.inputName << " */";
391 } else {
392 // no constructors with 0 or more than 2 parameters
393 assert( false );
394 } // if
395 break;
396
397 case OT_PREFIX:
398 case OT_PREFIXASSIGN:
399 assert( applicationExpr->get_args().size() == 1 );
400 output << "(";
401 output << opInfo.symbol;
402 (*arg)->accept( *visitor );
403 output << ")";
404 break;
405
406 case OT_POSTFIX:
407 case OT_POSTFIXASSIGN:
408 assert( applicationExpr->get_args().size() == 1 );
409 (*arg)->accept( *visitor );
410 output << opInfo.symbol;
411 break;
412
413
414 case OT_INFIX:
415 case OT_INFIXASSIGN:
416 assert( applicationExpr->get_args().size() == 2 );
417 output << "(";
418 (*arg++)->accept( *visitor );
419 output << opInfo.symbol;
420 (*arg)->accept( *visitor );
421 output << ")";
422 break;
423
424 case OT_CONSTANT:
425 case OT_LABELADDRESS:
426 // there are no intrinsic definitions of 0/1 or label addresses as functions
427 assert( false );
428 } // switch
429 } else {
430 varExpr->accept( *visitor );
431 output << "(";
432 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
433 output << ")";
434 } // if
435 } else {
436 applicationExpr->get_function()->accept( *visitor );
437 output << "(";
438 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
439 output << ")";
440 } // if
441 }
442
443 void CodeGenerator::postvisit( UntypedExpr * untypedExpr ) {
444 extension( untypedExpr );
445 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
446 OperatorInfo opInfo;
447 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
448 std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
449 switch ( opInfo.type ) {
450 case OT_INDEX:
451 assert( untypedExpr->get_args().size() == 2 );
452 (*arg++)->accept( *visitor );
453 output << "[";
454 (*arg)->accept( *visitor );
455 output << "]";
456 break;
457
458 case OT_CALL:
459 assert( false );
460
461 case OT_CTOR:
462 case OT_DTOR:
463 if ( untypedExpr->get_args().size() == 1 ) {
464 // the expression fed into a single parameter constructor or destructor may contain side
465 // effects, so must still output this expression
466 output << "(";
467 (*arg++)->accept( *visitor );
468 output << ") /* " << opInfo.inputName << " */";
469 } else if ( untypedExpr->get_args().size() == 2 ) {
470 // intrinsic two parameter constructors are essentially bitwise assignment
471 output << "(";
472 (*arg++)->accept( *visitor );
473 output << opInfo.symbol;
474 (*arg)->accept( *visitor );
475 output << ") /* " << opInfo.inputName << " */";
476 } else {
477 // no constructors with 0 or more than 2 parameters
478 assertf( ! genC, "UntypedExpr constructor/destructor with 0 or more than 2 parameters." );
479 output << "(";
480 (*arg++)->accept( *visitor );
481 output << opInfo.symbol << "{ ";
482 genCommaList( arg, untypedExpr->get_args().end() );
483 output << "}) /* " << opInfo.inputName << " */";
484 } // if
485 break;
486
487 case OT_PREFIX:
488 case OT_PREFIXASSIGN:
489 case OT_LABELADDRESS:
490 assert( untypedExpr->get_args().size() == 1 );
491 output << "(";
492 output << opInfo.symbol;
493 (*arg)->accept( *visitor );
494 output << ")";
495 break;
496
497 case OT_POSTFIX:
498 case OT_POSTFIXASSIGN:
499 assert( untypedExpr->get_args().size() == 1 );
500 (*arg)->accept( *visitor );
501 output << opInfo.symbol;
502 break;
503
504 case OT_INFIX:
505 case OT_INFIXASSIGN:
506 assert( untypedExpr->get_args().size() == 2 );
507 output << "(";
508 (*arg++)->accept( *visitor );
509 output << opInfo.symbol;
510 (*arg)->accept( *visitor );
511 output << ")";
512 break;
513
514 case OT_CONSTANT:
515 // there are no intrinsic definitions of 0 or 1 as functions
516 assert( false );
517 } // switch
518 } else {
519 if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
520 assert( untypedExpr->get_args().size() == 2 );
521 (*untypedExpr->get_args().begin())->accept( *visitor );
522 output << " ... ";
523 (*--untypedExpr->get_args().end())->accept( *visitor );
524 } else { // builtin routines
525 nameExpr->accept( *visitor );
526 output << "(";
527 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
528 output << ")";
529 } // if
530 } // if
531 } else {
532 untypedExpr->get_function()->accept( *visitor );
533 output << "(";
534 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
535 output << ")";
536 } // if
537 }
538
539 void CodeGenerator::postvisit( RangeExpr * rangeExpr ) {
540 rangeExpr->get_low()->accept( *visitor );
541 output << " ... ";
542 rangeExpr->get_high()->accept( *visitor );
543 }
544
545 void CodeGenerator::postvisit( NameExpr * nameExpr ) {
546 extension( nameExpr );
547 OperatorInfo opInfo;
548 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
549 assert( opInfo.type == OT_CONSTANT );
550 output << opInfo.symbol;
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
952 void CodeGenerator::postvisit( WhileStmt * whileStmt ) {
953 if ( whileStmt->get_isDoWhile() ) {
954 output << "do" ;
955 } else {
956 output << "while (" ;
957 whileStmt->get_condition()->accept( *visitor );
958 output << ")";
959 } // if
960 output << " ";
961
962 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
963 whileStmt->get_body()->accept( *visitor );
964
965 output << indent;
966
967 if ( whileStmt->get_isDoWhile() ) {
968 output << " while (" ;
969 whileStmt->get_condition()->accept( *visitor );
970 output << ");";
971 } // if
972 }
973
974 void CodeGenerator::postvisit( ForStmt * forStmt ) {
975 // initialization is always hoisted, so don't bother doing anything with that
976 output << "for (;";
977
978 if ( forStmt->get_condition() != 0 ) {
979 forStmt->get_condition()->accept( *visitor );
980 } // if
981 output << ";";
982
983 if ( forStmt->get_increment() != 0 ) {
984 // cast the top-level expression to void to reduce gcc warnings.
985 Expression * expr = new CastExpr( forStmt->get_increment() );
986 expr->accept( *visitor );
987 } // if
988 output << ") ";
989
990 if ( forStmt->get_body() != 0 ) {
991 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
992 forStmt->get_body()->accept( *visitor );
993 } // if
994 }
995
996 void CodeGenerator::postvisit( __attribute__((unused)) NullStmt * nullStmt ) {
997 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
998 output << "/* null statement */ ;";
999 }
1000
1001 void CodeGenerator::postvisit( DeclStmt * declStmt ) {
1002 declStmt->get_decl()->accept( *visitor );
1003
1004 if ( doSemicolon( declStmt->get_decl() ) ) {
1005 output << ";";
1006 } // if
1007 }
1008
1009 void CodeGenerator::postvisit( ImplicitCtorDtorStmt * stmt ) {
1010 assertf( ! genC, "ImplicitCtorDtorStmts should not reach code generation." );
1011 stmt->callStmt->accept( *visitor );
1012 }
1013
1014 void CodeGenerator::handleStorageClass( DeclarationWithType * decl ) {
1015 if ( decl->get_storageClasses().any() ) {
1016 decl->get_storageClasses().print( output );
1017 } // if
1018 } // CodeGenerator::handleStorageClass
1019
1020 std::string genName( DeclarationWithType * decl ) {
1021 CodeGen::OperatorInfo opInfo;
1022 if ( operatorLookup( decl->get_name(), opInfo ) ) {
1023 return opInfo.outputName;
1024 } else {
1025 return decl->get_name();
1026 } // if
1027 }
1028} // namespace CodeGen
1029
1030std::ostream & operator<<( std::ostream & out, const BaseSyntaxNode * node ) {
1031 if ( node ) {
1032 node->print( out );
1033 } else {
1034 out << "nullptr";
1035 }
1036 return out;
1037}
1038
1039// Local Variables: //
1040// tab-width: 4 //
1041// mode: c++ //
1042// compile-command: "make install" //
1043// End: //
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