source: src/CodeGen/CodeGenerator.cc@ 3a513d89

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1//
2// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// CodeGenerator.cc --
8//
9// Author : Richard C. Bilson
10// Created On : Mon May 18 07:44:20 2015
11// Last Modified By : Andrew Beach
12// Last Modified On : Wed Jun 29 14:34:00 2022
13// Update Count : 542
14//
15#include "CodeGenerator.h"
16
17#include <cassert> // for assert, assertf
18#include <list> // for _List_iterator, list, list<>::it...
19#include <sstream> // for stringstream
20
21#include "AST/Decl.hpp" // for DeclWithType
22#include "Common/UniqueName.h" // for UniqueName
23#include "GenType.h" // for genType
24#include "InitTweak/InitTweak.h" // for getPointerBase
25#include "OperatorTable.h" // for OperatorInfo, operatorLookup
26#include "SynTree/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< WhileDoStmt * >( 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 within a node should become the method of formating.
82 void CodeGenerator::updateLocation( CodeLocation const & to ) {
83 // skip if linemarks shouldn't appear or if codelocation is unset
84 if ( !options.lineMarks || to.isUnset() ) return;
85
86 if ( currentLocation.followedBy( to, 0 ) ) {
87 return;
88 } else if ( currentLocation.followedBy( to, 1 ) ) {
89 output << "\n" << indent;
90 currentLocation.first_line += 1;
91 } else if ( currentLocation.followedBy( to, 2 ) ) {
92 output << "\n\n" << indent;
93 currentLocation.first_line += 2;
94 } else {
95 output << "\n# " << to.first_line << " \"" << to.filename
96 << "\"\n" << indent;
97 currentLocation = to;
98 }
99 output << std::flush;
100 }
101
102 void CodeGenerator::updateLocation( BaseSyntaxNode const * to ) {
103 updateLocation( to->location );
104 }
105
106 // replace endl
107 ostream & CodeGenerator::LineEnder::operator()( ostream & os ) const {
108 // if ( !cg.lineMarks ) {
109 // os << "\n" << cg.indent << std::flush;
110 // }
111 os << "\n" << std::flush;
112 cg.currentLocation.first_line++;
113 // os << "/* did endl; current loc is: " << cg.currentLocation.first_line << "*/";
114 return os;
115 }
116
117 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 ) {}
118 CodeGenerator::CodeGenerator( std::ostream & os, const Options &options ) : indent( 0, CodeGenerator::tabsize ), output( os ), printLabels( *this ), options(options), endl( *this ) {}
119
120 string CodeGenerator::mangleName( DeclarationWithType * decl ) {
121 // GCC builtins should always be printed unmangled
122 if ( options.pretty || decl->linkage.is_gcc_builtin ) return decl->name;
123 if ( LinkageSpec::isMangled(decl->linkage) && decl->mangleName != "" ) {
124 // need to incorporate scope level in order to differentiate names for destructors
125 return decl->get_scopedMangleName();
126 } else {
127 return decl->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)->name;
136 if ( ! (*attr)->parameters.empty() ) {
137 output << "(";
138 genCommaList( (*attr)->parameters.begin(), (*attr)->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 // *** Expression
163 void CodeGenerator::previsit( Expression * node ) {
164 previsit( (BaseSyntaxNode *)node );
165 GuardAction( [this, node](){
166 if ( options.printExprTypes && node->result ) {
167 output << " /* " << genType( node->result, "", options ) << " */ ";
168 }
169 } );
170 }
171
172 // *** Declarations
173 void CodeGenerator::postvisit( FunctionDecl * functionDecl ) {
174 // deleted decls should never be used, so don't print them
175 if ( functionDecl->isDeleted && options.genC ) return;
176 extension( functionDecl );
177 genAttributes( functionDecl->get_attributes() );
178
179 handleStorageClass( functionDecl );
180 functionDecl->get_funcSpec().print( output );
181
182 Options subOptions = options;
183 subOptions.anonymousUnused = functionDecl->has_body();
184 output << genType( functionDecl->get_functionType(), mangleName( functionDecl ), subOptions );
185
186 asmName( functionDecl );
187
188 if ( functionDecl->get_statements() ) {
189 functionDecl->get_statements()->accept( *visitor );
190 } // if
191 if ( functionDecl->isDeleted ) {
192 output << " = void";
193 }
194 }
195
196 void CodeGenerator::postvisit( ObjectDecl * objectDecl ) {
197 // deleted decls should never be used, so don't print them
198 if ( objectDecl->isDeleted && options.genC ) return;
199
200 // gcc allows an empty declarator (no name) for bit-fields and C states: 6.7.2.1 Structure and union specifiers,
201 // point 4, page 113: If the (bit field) value is zero, the declaration shall have no declarator. For anything
202 // else, the anonymous name refers to the anonymous object for plan9 inheritance.
203 if ( objectDecl->get_name().empty() && options.genC && ! objectDecl->get_bitfieldWidth() ) {
204 // only generate an anonymous name when generating C code, otherwise it clutters the output too much
205 static UniqueName name = { "__anonymous_object" };
206 objectDecl->set_name( name.newName() );
207 // Stops unused parameter warnings.
208 if ( options.anonymousUnused ) {
209 objectDecl->attributes.push_back( new Attribute( "unused" ) );
210 }
211 }
212
213 extension( objectDecl );
214 genAttributes( objectDecl->get_attributes() );
215
216 handleStorageClass( objectDecl );
217 output << genType( objectDecl->get_type(), mangleName( objectDecl ), options.pretty, options.genC );
218
219 asmName( objectDecl );
220
221 if ( objectDecl->get_init() ) {
222 output << " = ";
223 objectDecl->get_init()->accept( *visitor );
224 } // if
225 if ( objectDecl->isDeleted ) {
226 output << " = void";
227 }
228
229 if ( objectDecl->get_bitfieldWidth() ) {
230 output << ":";
231 objectDecl->get_bitfieldWidth()->accept( *visitor );
232 } // if
233 }
234
235 void CodeGenerator::handleAggregate( AggregateDecl * aggDecl, const std::string & kind ) {
236 if( ! aggDecl->parameters.empty() && ! options.genC ) {
237 // assertf( ! genC, "Aggregate type parameters should not reach code generation." );
238 output << "forall(";
239 genCommaList( aggDecl->parameters.begin(), aggDecl->parameters.end() );
240 output << ")" << endl;
241 output << indent;
242 }
243
244 output << kind;
245 genAttributes( aggDecl->attributes );
246 output << aggDecl->name;
247
248 if ( aggDecl->has_body() ) {
249 std::list< Declaration * > & memb = aggDecl->members;
250 output << " {" << endl;
251
252 ++indent;
253 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
254 output << indent;
255 (*i)->accept( *visitor );
256 output << ";" << endl;
257 } // for
258
259 --indent;
260
261 output << indent << "}";
262 } // if
263 }
264
265 void CodeGenerator::postvisit( StructDecl * structDecl ) {
266 extension( structDecl );
267 handleAggregate( structDecl, "struct " );
268 }
269
270 void CodeGenerator::postvisit( UnionDecl * unionDecl ) {
271 extension( unionDecl );
272 handleAggregate( unionDecl, "union " );
273 }
274
275 template<typename pass_type>
276 inline void genEnumInitializer( PassVisitor<pass_type> * visitor, Type * baseType, std::ostream & output,
277 Initializer * init, long long * cur_val, Options options) {
278 auto baseTypeAsBasic = baseType ? dynamic_cast<BasicType *>( baseType ) : nullptr;
279 if ( init ) { // If value has an explicit initiazatior
280 output << " = ";
281 output << "(" << genType(baseType, "", options) << ")";
282 init->accept( *visitor );
283 if ( baseTypeAsBasic && baseTypeAsBasic->isInteger() ) { // if it is an integral type and initilizer offered,
284 // need to update the cur_val
285 Expression* expr = ((SingleInit *)(init))->value;
286 while ( auto temp = dynamic_cast<CastExpr *>(expr) ) { // unwrap introduced cast
287 expr = temp->arg;
288 }
289 *cur_val = ((ConstantExpr *)expr)->constant.get_ival()+1;
290 }
291 } else if ( baseTypeAsBasic && baseTypeAsBasic->isInteger() ) { // integral implicitly init to cur_val + 1
292 output << " = " << "(" << genType(baseType, "", options) << ")";
293 output << (*cur_val)++;
294 }
295 }
296
297 void CodeGenerator::handleData( EnumDecl * ) {
298 // output << " /** data type */" << endl;
299 // for ( StructDecl * decl : dataDecl->data_constructors ) {
300 // postvisit(decl);
301 // output << ";" << endl;
302 // }
303 // postvisit( dataDecl->data_union );
304 // output << ";" << endl;
305 // postvisit( dataDecl->tag );
306 // output << ";" << endl;
307 // postvisit( dataDecl->tag_union );
308 // output << ";" << endl;
309 assert(false);
310 }
311
312 void CodeGenerator::postvisit( EnumDecl * enumDecl ) {
313 // if ( enumDecl->data_constructors.size() > 0 ) return handleData( enumDecl );
314 extension( enumDecl );
315 std::list< Declaration* > &memb = enumDecl->get_members();
316 if (enumDecl->base && ! memb.empty()) {
317 long long cur_val = 0;
318 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
319 ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
320 assert( obj );
321 output << "static ";
322 output << genType(enumDecl->base, mangleName( obj ), options);
323 genEnumInitializer( visitor, enumDecl->base, output, obj->get_init(), &cur_val, options);
324 output << ";" << endl;
325 } // for
326 } else {
327 output << "enum ";
328 genAttributes( enumDecl->get_attributes() );
329
330 output << enumDecl->get_name();
331
332 if ( ! memb.empty() ) {
333 output << " {" << endl;
334
335 ++indent;
336 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
337 ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
338 assert( obj );
339 output << indent << mangleName( obj );
340 if ( obj->get_init() ) {
341 output << " = ";
342 obj->get_init()->accept( *visitor );
343 } // if
344 output << "," << endl;
345 } // for
346 --indent;
347 output << indent << "}";
348 } // if
349 } // if
350 }
351
352 void CodeGenerator::postvisit( AdtDecl * ) {
353 // TODO
354 }
355
356 void CodeGenerator::postvisit( TraitDecl * traitDecl ) {
357 assertf( ! options.genC, "TraitDecls should not reach code generation." );
358 extension( traitDecl );
359 handleAggregate( traitDecl, "trait " );
360 }
361
362 void CodeGenerator::postvisit( TypedefDecl * typeDecl ) {
363 assertf( ! options.genC, "Typedefs are removed and substituted in earlier passes." );
364 output << "typedef ";
365 output << genType( typeDecl->get_base(), typeDecl->get_name(), options ) << endl;
366 }
367
368 void CodeGenerator::postvisit( TypeDecl * typeDecl ) {
369 assertf( ! options.genC, "TypeDecls should not reach code generation." );
370 output << typeDecl->genTypeString() << " " << typeDecl->name;
371 if ( typeDecl->sized ) {
372 output << " | sized(" << typeDecl->name << ")";
373 }
374 if ( ! typeDecl->assertions.empty() ) {
375 output << " | { ";
376 for ( DeclarationWithType * assert : typeDecl->assertions ) {
377 assert->accept( *visitor );
378 output << "; ";
379 }
380 output << " }";
381 }
382 }
383
384 void CodeGenerator::postvisit( StaticAssertDecl * assertDecl ) {
385 output << "_Static_assert(";
386 assertDecl->condition->accept( *visitor );
387 output << ", ";
388 assertDecl->message->accept( *visitor );
389 output << ")";
390 }
391
392 void CodeGenerator::postvisit( Designation * designation ) {
393 std::list< Expression * > designators = designation->get_designators();
394 if ( designators.size() == 0 ) return;
395 for ( Expression * des : designators ) {
396 if ( dynamic_cast< NameExpr * >( des ) || dynamic_cast< VariableExpr * >( des ) ) {
397 // if expression is a NameExpr or VariableExpr, then initializing aggregate member
398 output << ".";
399 des->accept( *visitor );
400 } else {
401 // otherwise, it has to be a ConstantExpr or CastExpr, initializing array element
402 output << "[";
403 des->accept( *visitor );
404 output << "]";
405 } // if
406 } // for
407 output << " = ";
408 }
409
410 void CodeGenerator::postvisit( SingleInit * init ) {
411 init->get_value()->accept( *visitor );
412 }
413
414 void CodeGenerator::postvisit( ListInit * init ) {
415 auto initBegin = init->begin();
416 auto initEnd = init->end();
417 auto desigBegin = init->get_designations().begin();
418 auto desigEnd = init->get_designations().end();
419
420 output << "{ ";
421 for ( ; initBegin != initEnd && desigBegin != desigEnd; ) {
422 (*desigBegin)->accept( *visitor );
423 (*initBegin)->accept( *visitor );
424 ++initBegin, ++desigBegin;
425 if ( initBegin != initEnd ) {
426 output << ", ";
427 }
428 }
429 output << " }";
430 assertf( initBegin == initEnd && desigBegin == desigEnd, "Initializers and designators not the same length. %s", toString( init ).c_str() );
431 }
432
433 void CodeGenerator::postvisit( ConstructorInit * init ){
434 assertf( ! options.genC, "ConstructorInit nodes should not reach code generation." );
435 // pseudo-output for constructor/destructor pairs
436 output << "<ctorinit>{" << endl << ++indent << "ctor: ";
437 maybeAccept( init->get_ctor(), *visitor );
438 output << ", " << endl << indent << "dtor: ";
439 maybeAccept( init->get_dtor(), *visitor );
440 output << endl << --indent << "}";
441 }
442
443 void CodeGenerator::postvisit( Constant * constant ) {
444 output << constant->get_value();
445 }
446
447 // *** Expressions
448 void CodeGenerator::postvisit( ApplicationExpr * applicationExpr ) {
449 extension( applicationExpr );
450 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
451 const OperatorInfo * opInfo;
452 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && ( opInfo = operatorLookup( varExpr->get_var()->get_name() ) ) ) {
453 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
454 switch ( opInfo->type ) {
455 case OT_INDEX:
456 assert( applicationExpr->get_args().size() == 2 );
457 (*arg++)->accept( *visitor );
458 output << "[";
459 (*arg)->accept( *visitor );
460 output << "]";
461 break;
462
463 case OT_CALL:
464 // there are no intrinsic definitions of the function call operator
465 assert( false );
466 break;
467
468 case OT_CTOR:
469 case OT_DTOR:
470 if ( applicationExpr->get_args().size() == 1 ) {
471 // the expression fed into a single parameter constructor or destructor may contain side
472 // effects, so must still output this expression
473 output << "(";
474 (*arg++)->accept( *visitor );
475 output << ") /* " << opInfo->inputName << " */";
476 } else if ( applicationExpr->get_args().size() == 2 ) {
477 // intrinsic two parameter constructors are essentially bitwise assignment
478 output << "(";
479 (*arg++)->accept( *visitor );
480 output << opInfo->symbol;
481 (*arg)->accept( *visitor );
482 output << ") /* " << opInfo->inputName << " */";
483 } else {
484 // no constructors with 0 or more than 2 parameters
485 assert( false );
486 } // if
487 break;
488
489 case OT_PREFIX:
490 case OT_PREFIXASSIGN:
491 assert( applicationExpr->get_args().size() == 1 );
492 output << "(";
493 output << opInfo->symbol;
494 (*arg)->accept( *visitor );
495 output << ")";
496 break;
497
498 case OT_POSTFIX:
499 case OT_POSTFIXASSIGN:
500 assert( applicationExpr->get_args().size() == 1 );
501 (*arg)->accept( *visitor );
502 output << opInfo->symbol;
503 break;
504
505
506 case OT_INFIX:
507 case OT_INFIXASSIGN:
508 assert( applicationExpr->get_args().size() == 2 );
509 output << "(";
510 (*arg++)->accept( *visitor );
511 output << opInfo->symbol;
512 (*arg)->accept( *visitor );
513 output << ")";
514 break;
515
516 case OT_CONSTANT:
517 case OT_LABELADDRESS:
518 // there are no intrinsic definitions of 0/1 or label addresses as functions
519 assert( false );
520 } // switch
521 } else if( varExpr->get_var()->get_linkage() == LinkageSpec::BuiltinCFA && varExpr->get_var()->get_name() == "intptr" ) {
522 // THIS is a hack to make it a constant until a proper constexpr solution is created
523 output << "((void*)";
524 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
525 (*arg++)->accept( *visitor );
526 output << ")";
527 } else {
528 varExpr->accept( *visitor );
529 output << "(";
530 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
531 output << ")";
532 } // if
533 } else {
534 applicationExpr->get_function()->accept( *visitor );
535 output << "(";
536 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
537 output << ")";
538 } // if
539 }
540
541 void CodeGenerator::postvisit( UntypedExpr * untypedExpr ) {
542 extension( untypedExpr );
543 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->function ) ) {
544 const OperatorInfo * opInfo = operatorLookup( nameExpr->name );
545 if ( opInfo ) {
546 std::list< Expression* >::iterator arg = untypedExpr->args.begin();
547 switch ( opInfo->type ) {
548 case OT_INDEX:
549 assert( untypedExpr->args.size() == 2 );
550 (*arg++)->accept( *visitor );
551 output << "[";
552 (*arg)->accept( *visitor );
553 output << "]";
554 break;
555
556 case OT_CALL:
557 assert( false );
558
559 case OT_CTOR:
560 case OT_DTOR:
561 if ( untypedExpr->args.size() == 1 ) {
562 // the expression fed into a single parameter constructor or destructor may contain side
563 // effects, so must still output this expression
564 output << "(";
565 (*arg++)->accept( *visitor );
566 output << ") /* " << opInfo->inputName << " */";
567 } else if ( untypedExpr->get_args().size() == 2 ) {
568 // intrinsic two parameter constructors are essentially bitwise assignment
569 output << "(";
570 (*arg++)->accept( *visitor );
571 output << opInfo->symbol;
572 (*arg)->accept( *visitor );
573 output << ") /* " << opInfo->inputName << " */";
574 } else {
575 // no constructors with 0 or more than 2 parameters
576 assertf( ! options.genC, "UntypedExpr constructor/destructor with 0 or more than 2 parameters." );
577 output << "(";
578 (*arg++)->accept( *visitor );
579 output << opInfo->symbol << "{ ";
580 genCommaList( arg, untypedExpr->args.end() );
581 output << "}) /* " << opInfo->inputName << " */";
582 } // if
583 break;
584
585 case OT_PREFIX:
586 case OT_PREFIXASSIGN:
587 case OT_LABELADDRESS:
588 assert( untypedExpr->args.size() == 1 );
589 output << "(";
590 output << opInfo->symbol;
591 (*arg)->accept( *visitor );
592 output << ")";
593 break;
594
595 case OT_POSTFIX:
596 case OT_POSTFIXASSIGN:
597 assert( untypedExpr->args.size() == 1 );
598 (*arg)->accept( *visitor );
599 output << opInfo->symbol;
600 break;
601
602 case OT_INFIX:
603 case OT_INFIXASSIGN:
604 assert( untypedExpr->args.size() == 2 );
605 output << "(";
606 (*arg++)->accept( *visitor );
607 output << opInfo->symbol;
608 (*arg)->accept( *visitor );
609 output << ")";
610 break;
611
612 case OT_CONSTANT:
613 // there are no intrinsic definitions of 0 or 1 as functions
614 assert( false );
615 } // switch
616 } else {
617 // builtin routines
618 nameExpr->accept( *visitor );
619 output << "(";
620 genCommaList( untypedExpr->args.begin(), untypedExpr->args.end() );
621 output << ")";
622 } // if
623 } else {
624 untypedExpr->function->accept( *visitor );
625 output << "(";
626 genCommaList( untypedExpr->args.begin(), untypedExpr->args.end() );
627 output << ")";
628 } // if
629 }
630
631 void CodeGenerator::postvisit( RangeExpr * rangeExpr ) {
632 rangeExpr->low->accept( *visitor );
633 output << " ... ";
634 rangeExpr->high->accept( *visitor );
635 }
636
637 void CodeGenerator::postvisit( NameExpr * nameExpr ) {
638 extension( nameExpr );
639 const OperatorInfo * opInfo = operatorLookup( nameExpr->name );
640 if ( opInfo ) {
641 if ( opInfo->type == OT_CONSTANT ) {
642 output << opInfo->symbol;
643 } else {
644 output << opInfo->outputName;
645 }
646 } else {
647 output << nameExpr->get_name();
648 } // if
649 }
650
651 void CodeGenerator::postvisit( DimensionExpr * dimensionExpr ) {
652 extension( dimensionExpr );
653 output << "/*non-type*/" << dimensionExpr->get_name();
654 }
655
656 void CodeGenerator::postvisit( AddressExpr * addressExpr ) {
657 extension( addressExpr );
658 output << "(&";
659 addressExpr->arg->accept( *visitor );
660 output << ")";
661 }
662
663 void CodeGenerator::postvisit( LabelAddressExpr *addressExpr ) {
664 extension( addressExpr );
665 output << "(&&" << addressExpr->arg << ")";
666 }
667
668 void CodeGenerator::postvisit( CastExpr * castExpr ) {
669 extension( castExpr );
670 output << "(";
671 if ( castExpr->get_result()->isVoid() ) {
672 output << "(void)";
673 } else {
674 // at least one result type of cast.
675 // Note: previously, lvalue casts were skipped. Since it's now impossible for the user to write
676 // an lvalue cast, this has been taken out.
677 output << "(";
678 output << genType( castExpr->get_result(), "", options );
679 output << ")";
680 } // if
681 castExpr->arg->accept( *visitor );
682 output << ")";
683 }
684
685 void CodeGenerator::postvisit( KeywordCastExpr * castExpr ) {
686 assertf( ! options.genC, "KeywordCast should not reach code generation." );
687 extension( castExpr );
688 output << "((" << castExpr->targetString() << " &)";
689 castExpr->arg->accept( *visitor );
690 output << ")";
691 }
692
693 void CodeGenerator::postvisit( VirtualCastExpr * castExpr ) {
694 assertf( ! options.genC, "VirtualCastExpr should not reach code generation." );
695 extension( castExpr );
696 output << "(virtual ";
697 castExpr->get_arg()->accept( *visitor );
698 output << ")";
699 }
700
701 void CodeGenerator::postvisit( UntypedMemberExpr * memberExpr ) {
702 assertf( ! options.genC, "UntypedMemberExpr should not reach code generation." );
703 extension( memberExpr );
704 memberExpr->get_aggregate()->accept( *visitor );
705 output << ".";
706 memberExpr->get_member()->accept( *visitor );
707 }
708
709 void CodeGenerator::postvisit( MemberExpr * memberExpr ) {
710 extension( memberExpr );
711 memberExpr->get_aggregate()->accept( *visitor );
712 output << "." << mangleName( memberExpr->get_member() );
713 }
714
715 void CodeGenerator::postvisit( VariableExpr * variableExpr ) {
716 extension( variableExpr );
717 const OperatorInfo * opInfo;
718 if( dynamic_cast<ZeroType*>( variableExpr->get_var()->get_type() ) ) {
719 output << "0";
720 } else if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && (opInfo = operatorLookup( variableExpr->get_var()->get_name() )) && opInfo->type == OT_CONSTANT ) {
721 output << opInfo->symbol;
722 } else {
723 output << mangleName( variableExpr->get_var() );
724 } // if
725 }
726
727 void CodeGenerator::postvisit( ConstantExpr * constantExpr ) {
728 assert( constantExpr->get_constant() );
729 extension( constantExpr );
730 constantExpr->get_constant()->accept( *visitor );
731 }
732
733 void CodeGenerator::postvisit( SizeofExpr * sizeofExpr ) {
734 extension( sizeofExpr );
735 output << "sizeof(";
736 if ( sizeofExpr->get_isType() ) {
737 output << genType( sizeofExpr->get_type(), "", options );
738 } else {
739 sizeofExpr->get_expr()->accept( *visitor );
740 } // if
741 output << ")";
742 }
743
744 void CodeGenerator::postvisit( AlignofExpr * alignofExpr ) {
745 // use GCC extension to avoid bumping std to C11
746 extension( alignofExpr );
747 output << "__alignof__(";
748 if ( alignofExpr->get_isType() ) {
749 output << genType( alignofExpr->get_type(), "", options );
750 } else {
751 alignofExpr->get_expr()->accept( *visitor );
752 } // if
753 output << ")";
754 }
755
756 void CodeGenerator::postvisit( UntypedOffsetofExpr * offsetofExpr ) {
757 assertf( ! options.genC, "UntypedOffsetofExpr should not reach code generation." );
758 output << "offsetof(";
759 output << genType( offsetofExpr->get_type(), "", options );
760 output << ", " << offsetofExpr->get_member();
761 output << ")";
762 }
763
764 void CodeGenerator::postvisit( OffsetofExpr * offsetofExpr ) {
765 // use GCC builtin
766 output << "__builtin_offsetof(";
767 output << genType( offsetofExpr->get_type(), "", options );
768 output << ", " << mangleName( offsetofExpr->get_member() );
769 output << ")";
770 }
771
772 void CodeGenerator::postvisit( OffsetPackExpr * offsetPackExpr ) {
773 assertf( ! options.genC, "OffsetPackExpr should not reach code generation." );
774 output << "__CFA_offsetpack(" << genType( offsetPackExpr->get_type(), "", options ) << ")";
775 }
776
777 void CodeGenerator::postvisit( LogicalExpr * logicalExpr ) {
778 extension( logicalExpr );
779 output << "(";
780 logicalExpr->get_arg1()->accept( *visitor );
781 if ( logicalExpr->get_isAnd() ) {
782 output << " && ";
783 } else {
784 output << " || ";
785 } // if
786 logicalExpr->get_arg2()->accept( *visitor );
787 output << ")";
788 }
789
790 void CodeGenerator::postvisit( ConditionalExpr * conditionalExpr ) {
791 extension( conditionalExpr );
792 output << "(";
793 conditionalExpr->get_arg1()->accept( *visitor );
794 output << " ? ";
795 conditionalExpr->get_arg2()->accept( *visitor );
796 output << " : ";
797 conditionalExpr->get_arg3()->accept( *visitor );
798 output << ")";
799 }
800
801 void CodeGenerator::postvisit( CommaExpr * commaExpr ) {
802 extension( commaExpr );
803 output << "(";
804 if ( options.genC ) {
805 // arg1 of a CommaExpr is never used, so it can be safely cast to void to reduce gcc warnings.
806 commaExpr->set_arg1( new CastExpr( commaExpr->get_arg1() ) );
807 }
808 commaExpr->get_arg1()->accept( *visitor );
809 output << " , ";
810 commaExpr->get_arg2()->accept( *visitor );
811 output << ")";
812 }
813
814 void CodeGenerator::postvisit( TupleAssignExpr * tupleExpr ) {
815 assertf( ! options.genC, "TupleAssignExpr should not reach code generation." );
816 tupleExpr->stmtExpr->accept( *visitor );
817 }
818
819 void CodeGenerator::postvisit( UntypedTupleExpr * tupleExpr ) {
820 assertf( ! options.genC, "UntypedTupleExpr should not reach code generation." );
821 extension( tupleExpr );
822 output << "[";
823 genCommaList( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end() );
824 output << "]";
825 }
826
827 void CodeGenerator::postvisit( TupleExpr * tupleExpr ) {
828 assertf( ! options.genC, "TupleExpr should not reach code generation." );
829 extension( tupleExpr );
830 output << "[";
831 genCommaList( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end() );
832 output << "]";
833 }
834
835 void CodeGenerator::postvisit( TupleIndexExpr * tupleExpr ) {
836 assertf( ! options.genC, "TupleIndexExpr should not reach code generation." );
837 extension( tupleExpr );
838 tupleExpr->get_tuple()->accept( *visitor );
839 output << "." << tupleExpr->get_index();
840 }
841
842 void CodeGenerator::postvisit( TypeExpr * typeExpr ) {
843 // if ( options.genC ) std::cerr << "typeexpr still exists: " << typeExpr << std::endl;
844 // assertf( ! options.genC, "TypeExpr should not reach code generation." );
845 if ( ! options.genC ) {
846 output << genType( typeExpr->get_type(), "", options );
847 }
848 }
849
850 void CodeGenerator::postvisit( AsmExpr * asmExpr ) {
851 if ( !asmExpr->inout.empty() ) {
852 output << "[ ";
853 output << asmExpr->inout;
854 output << " ] ";
855 } // if
856 asmExpr->constraint->accept( *visitor );
857 output << " ( ";
858 asmExpr->operand->accept( *visitor );
859 output << " )";
860 }
861
862 void CodeGenerator::postvisit( CompoundLiteralExpr *compLitExpr ) {
863 assert( compLitExpr->get_result() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
864 output << "(" << genType( compLitExpr->get_result(), "", options ) << ")";
865 compLitExpr->get_initializer()->accept( *visitor );
866 }
867
868 void CodeGenerator::postvisit( UniqueExpr * unqExpr ) {
869 assertf( ! options.genC, "Unique expressions should not reach code generation." );
870 output << "unq<" << unqExpr->get_id() << ">{ ";
871 unqExpr->get_expr()->accept( *visitor );
872 output << " }";
873 }
874
875 void CodeGenerator::postvisit( StmtExpr * stmtExpr ) {
876 std::list< Statement * > & stmts = stmtExpr->statements->kids;
877 output << "({" << endl;
878 ++indent;
879 unsigned int numStmts = stmts.size();
880 unsigned int i = 0;
881 for ( Statement * stmt : stmts ) {
882 output << indent << printLabels( stmt->get_labels() );
883 if ( i+1 == numStmts ) {
884 // last statement in a statement expression needs to be handled specially -
885 // cannot cast to void, otherwise the expression statement has no value
886 if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
887 exprStmt->expr->accept( *visitor );
888 output << ";" << endl;
889 ++i;
890 break;
891 }
892 }
893 stmt->accept( *visitor );
894 output << endl;
895 if ( wantSpacing( stmt ) ) {
896 output << endl;
897 } // if
898 ++i;
899 }
900 --indent;
901 output << indent << "})";
902 }
903
904 void CodeGenerator::postvisit( ConstructorExpr * expr ) {
905 assertf( ! options.genC, "Unique expressions should not reach code generation." );
906 expr->callExpr->accept( *visitor );
907 }
908
909 void CodeGenerator::postvisit( DeletedExpr * expr ) {
910 assertf( ! options.genC, "Deleted expressions should not reach code generation." );
911 expr->expr->accept( *visitor );
912 }
913
914 void CodeGenerator::postvisit( DefaultArgExpr * arg ) {
915 assertf( ! options.genC, "Default argument expressions should not reach code generation." );
916 arg->expr->accept( *visitor );
917 }
918
919 void CodeGenerator::postvisit( GenericExpr * expr ) {
920 assertf( ! options.genC, "C11 _Generic expressions should not reach code generation." );
921 output << "_Generic(";
922 expr->control->accept( *visitor );
923 output << ", ";
924 unsigned int numAssocs = expr->associations.size();
925 unsigned int i = 0;
926 for ( GenericExpr::Association & assoc : expr->associations ) {
927 if (assoc.isDefault) {
928 output << "default: ";
929 } else {
930 output << genType( assoc.type, "", options ) << ": ";
931 }
932 assoc.expr->accept( *visitor );
933 if ( i+1 != numAssocs ) {
934 output << ", ";
935 }
936 i++;
937 }
938 output << ")";
939 }
940
941 // *** Statements
942 void CodeGenerator::postvisit( CompoundStmt * compoundStmt ) {
943 std::list<Statement*> ks = compoundStmt->get_kids();
944 output << "{" << endl;
945
946 ++indent;
947
948 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
949 output << indent << printLabels( (*i)->get_labels() );
950 (*i)->accept( *visitor );
951
952 output << endl;
953 if ( wantSpacing( *i ) ) {
954 output << endl;
955 } // if
956 } // for
957 --indent;
958
959 output << indent << "}";
960 }
961
962 void CodeGenerator::postvisit( ExprStmt * exprStmt ) {
963 assert( exprStmt );
964 if ( options.genC ) {
965 // cast the top-level expression to void to reduce gcc warnings.
966 exprStmt->set_expr( new CastExpr( exprStmt->get_expr() ) );
967 }
968 exprStmt->get_expr()->accept( *visitor );
969 output << ";";
970 }
971
972 void CodeGenerator::postvisit( AsmStmt * asmStmt ) {
973 output << "asm ";
974 if ( asmStmt->get_voltile() ) output << "volatile ";
975 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
976 output << "( ";
977 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *visitor );
978 output << " : ";
979 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
980 output << " : ";
981 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
982 output << " : ";
983 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
984 if ( ! asmStmt->get_gotolabels().empty() ) {
985 output << " : ";
986 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
987 output << *begin++;
988 if ( begin == asmStmt->get_gotolabels().end() ) break;
989 output << ", ";
990 } // for
991 } // if
992 output << " );";
993 }
994
995 void CodeGenerator::postvisit( AsmDecl * asmDecl ) {
996 output << "asm ";
997 AsmStmt * asmStmt = asmDecl->get_stmt();
998 output << "( ";
999 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *visitor );
1000 output << " )";
1001 }
1002
1003 void CodeGenerator::postvisit( DirectiveDecl * directiveDecl ) {
1004 output << endl << directiveDecl->get_stmt()->directive; // endl prevents spaces before directive
1005 }
1006
1007 void CodeGenerator::postvisit( DirectiveStmt * dirStmt ) {
1008 output << endl << dirStmt->directive; // endl prevents spaces before directive
1009 }
1010
1011 void CodeGenerator::postvisit( IfStmt * ifStmt ) {
1012 output << "if ( ";
1013 ifStmt->get_condition()->accept( *visitor );
1014 output << " ) ";
1015
1016 ifStmt->get_then()->accept( *visitor );
1017
1018 if ( ifStmt->get_else() != 0) {
1019 output << " else ";
1020 ifStmt->get_else()->accept( *visitor );
1021 } // if
1022 }
1023
1024 void CodeGenerator::postvisit( SwitchStmt * switchStmt ) {
1025 output << "switch ( ";
1026 switchStmt->get_condition()->accept( *visitor );
1027 output << " ) ";
1028
1029 output << "{" << endl;
1030 ++indent;
1031 acceptAll( switchStmt->get_statements(), *visitor );
1032 --indent;
1033 output << indent << "}";
1034 }
1035
1036 void CodeGenerator::postvisit( CaseStmt * caseStmt ) {
1037 updateLocation( caseStmt );
1038 output << indent;
1039 if ( caseStmt->isDefault()) {
1040 output << "default";
1041 } else {
1042 output << "case ";
1043 caseStmt->get_condition()->accept( *visitor );
1044 } // if
1045 output << ":" << endl;
1046
1047 std::list<Statement *> sts = caseStmt->get_statements();
1048
1049 ++indent;
1050 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
1051 output << indent << printLabels( (*i)->get_labels() ) ;
1052 (*i)->accept( *visitor );
1053 output << endl;
1054 } // for
1055 --indent;
1056 }
1057
1058 void CodeGenerator::postvisit( BranchStmt * branchStmt ) {
1059 switch ( branchStmt->get_type()) {
1060 case BranchStmt::Goto:
1061 if ( ! branchStmt->get_target().empty() )
1062 output << "goto " << branchStmt->get_target();
1063 else {
1064 if ( branchStmt->get_computedTarget() != 0 ) {
1065 output << "goto *";
1066 branchStmt->get_computedTarget()->accept( *visitor );
1067 } // if
1068 } // if
1069 break;
1070 case BranchStmt::Break:
1071 output << "break";
1072 break;
1073 case BranchStmt::Continue:
1074 output << "continue";
1075 break;
1076 case BranchStmt::FallThrough:
1077 case BranchStmt::FallThroughDefault:
1078 assertf( ! options.genC, "fallthru should not reach code generation." );
1079 output << "fallthru";
1080 break;
1081 default: ; // prevent warning
1082 } // switch
1083 // print branch target for labelled break/continue/fallthru in debug mode
1084 if ( ! options.genC && branchStmt->get_type() != BranchStmt::Goto ) {
1085 if ( ! branchStmt->get_target().empty() ) {
1086 output << " " << branchStmt->get_target();
1087 } else if ( branchStmt->get_type() == BranchStmt::FallThrough ) {
1088 output << " default";
1089 }
1090 }
1091 output << ";";
1092 }
1093
1094 void CodeGenerator::postvisit( ReturnStmt * returnStmt ) {
1095 output << "return ";
1096 maybeAccept( returnStmt->get_expr(), *visitor );
1097 output << ";";
1098 }
1099
1100 void CodeGenerator::postvisit( ThrowStmt * throwStmt ) {
1101 assertf( ! options.genC, "Throw statements should not reach code generation." );
1102
1103 output << ((throwStmt->get_kind() == ThrowStmt::Terminate) ?
1104 "throw" : "throwResume");
1105 if (throwStmt->get_expr()) {
1106 output << " ";
1107 throwStmt->get_expr()->accept( *visitor );
1108 }
1109 if (throwStmt->get_target()) {
1110 output << " _At ";
1111 throwStmt->get_target()->accept( *visitor );
1112 }
1113 output << ";";
1114 }
1115 void CodeGenerator::postvisit( CatchStmt * stmt ) {
1116 assertf( ! options.genC, "Catch statements should not reach code generation." );
1117
1118 output << ((stmt->get_kind() == CatchStmt::Terminate) ?
1119 "catch" : "catchResume");
1120 output << "( ";
1121 stmt->decl->accept( *visitor );
1122 output << " ) ";
1123
1124 if( stmt->cond ) {
1125 output << "if/when(?) (";
1126 stmt->cond->accept( *visitor );
1127 output << ") ";
1128 }
1129 stmt->body->accept( *visitor );
1130 }
1131
1132 void CodeGenerator::postvisit( WaitForStmt * stmt ) {
1133 assertf( ! options.genC, "Waitfor statements should not reach code generation." );
1134
1135 bool first = true;
1136 for( auto & clause : stmt->clauses ) {
1137 if(first) { output << "or "; first = false; }
1138 if( clause.condition ) {
1139 output << "when(";
1140 stmt->timeout.condition->accept( *visitor );
1141 output << ") ";
1142 }
1143 output << "waitfor(";
1144 clause.target.function->accept( *visitor );
1145 for( Expression * expr : clause.target.arguments ) {
1146 output << ",";
1147 expr->accept( *visitor );
1148 }
1149 output << ") ";
1150 clause.statement->accept( *visitor );
1151 }
1152
1153 if( stmt->timeout.statement ) {
1154 output << "or ";
1155 if( stmt->timeout.condition ) {
1156 output << "when(";
1157 stmt->timeout.condition->accept( *visitor );
1158 output << ") ";
1159 }
1160 output << "timeout(";
1161 stmt->timeout.time->accept( *visitor );
1162 output << ") ";
1163 stmt->timeout.statement->accept( *visitor );
1164 }
1165
1166 if( stmt->orelse.statement ) {
1167 output << "or ";
1168 if( stmt->orelse.condition ) {
1169 output << "when(";
1170 stmt->orelse.condition->accept( *visitor );
1171 output << ")";
1172 }
1173 output << "else ";
1174 stmt->orelse.statement->accept( *visitor );
1175 }
1176 }
1177
1178 void CodeGenerator::postvisit( WithStmt * with ) {
1179 if ( ! options.genC ) {
1180 output << "with ( ";
1181 genCommaList( with->exprs.begin(), with->exprs.end() );
1182 output << " ) ";
1183 }
1184 with->stmt->accept( *visitor );
1185 }
1186
1187 void CodeGenerator::postvisit( WhileDoStmt * whileDoStmt ) {
1188 if ( whileDoStmt->get_isDoWhile() ) {
1189 output << "do";
1190 } else {
1191 output << "while (";
1192 whileDoStmt->get_condition()->accept( *visitor );
1193 output << ")";
1194 } // if
1195 output << " ";
1196
1197 output << CodeGenerator::printLabels( whileDoStmt->get_body()->get_labels() );
1198 whileDoStmt->get_body()->accept( *visitor );
1199
1200 output << indent;
1201
1202 if ( whileDoStmt->get_isDoWhile() ) {
1203 output << " while (";
1204 whileDoStmt->get_condition()->accept( *visitor );
1205 output << ");";
1206 } // if
1207 }
1208
1209 void CodeGenerator::postvisit( ForStmt * forStmt ) {
1210 // initialization is always hoisted, so don't bother doing anything with that
1211 output << "for (;";
1212
1213 if ( forStmt->get_condition() != 0 ) {
1214 forStmt->get_condition()->accept( *visitor );
1215 } // if
1216 output << ";";
1217
1218 if ( forStmt->get_increment() != 0 ) {
1219 // cast the top-level expression to void to reduce gcc warnings.
1220 Expression * expr = new CastExpr( forStmt->get_increment() );
1221 expr->accept( *visitor );
1222 } // if
1223 output << ") ";
1224
1225 if ( forStmt->get_body() != 0 ) {
1226 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
1227 forStmt->get_body()->accept( *visitor );
1228 } // if
1229 }
1230
1231 void CodeGenerator::postvisit( __attribute__((unused)) NullStmt * nullStmt ) {
1232 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
1233 output << "/* null statement */ ;";
1234 }
1235
1236 void CodeGenerator::postvisit( DeclStmt * declStmt ) {
1237 declStmt->get_decl()->accept( *visitor );
1238
1239 if ( doSemicolon( declStmt->get_decl() ) ) {
1240 output << ";";
1241 } // if
1242 }
1243
1244 void CodeGenerator::postvisit( ImplicitCtorDtorStmt * stmt ) {
1245 assertf( ! options.genC, "ImplicitCtorDtorStmts should not reach code generation." );
1246 stmt->callStmt->accept( *visitor );
1247 }
1248
1249 void CodeGenerator::postvisit( MutexStmt * stmt ) {
1250 assertf( ! options.genC, "ImplicitCtorDtorStmts should not reach code generation." );
1251 stmt->stmt->accept( *visitor );
1252 }
1253
1254 void CodeGenerator::handleStorageClass( DeclarationWithType * decl ) {
1255 if ( decl->get_storageClasses().any() ) {
1256 decl->get_storageClasses().print( output );
1257 } // if
1258 } // CodeGenerator::handleStorageClass
1259
1260 std::string genName( DeclarationWithType * decl ) {
1261 const OperatorInfo * opInfo = operatorLookup( decl->get_name() );
1262 if ( opInfo ) {
1263 return opInfo->outputName;
1264 } else {
1265 return decl->get_name();
1266 } // if
1267 }
1268
1269std::string genName( ast::DeclWithType const * decl ) {
1270 if ( const OperatorInfo * opInfo = operatorLookup( decl->name ) ) {
1271 return opInfo->outputName;
1272 } else {
1273 return decl->name;
1274 }
1275}
1276
1277} // namespace CodeGen
1278
1279// Local Variables: //
1280// tab-width: 4 //
1281// mode: c++ //
1282// compile-command: "make install" //
1283// End: //
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