source: src/CodeGen/CodeGenerator.cc@ 7493339

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 7493339 was fbcde64, checked in by Peter A. Buhr <pabuhr@…>, 8 years ago

remove duplication in compound literal, support aggregate-type compound literals
  • Property mode set to 100644
File size: 27.5 KB
RevLine 
[51587aa]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//
[71f4e4f]7// CodeGenerator.cc --
[51587aa]8//
9// Author : Richard C. Bilson
10// Created On : Mon May 18 07:44:20 2015
[8688ce1]11// Last Modified By : Peter A. Buhr
[fbcde64]12// Last Modified On : Thu Mar 30 16:38:01 2017
13// Update Count : 482
[51587aa]14//
15
[51b73452]16#include <algorithm>
17#include <iostream>
18#include <cassert>
19#include <list>
20
[68cd1ce]21#include "Parser/ParseNode.h"
22
[e8032b0]23#include "SynTree/Declaration.h"
[51b73452]24#include "SynTree/Expression.h"
25#include "SynTree/Initializer.h"
[68cd1ce]26#include "SynTree/Statement.h"
[e8032b0]27#include "SynTree/Type.h"
[7baed7d]28#include "SynTree/Attribute.h"
[51b73452]29
[d3b7937]30#include "Common/utility.h"
31#include "Common/UnimplementedError.h"
[51b73452]32
[a61fea9a]33#include "CodeGenerator.h"
[51b73452]34#include "OperatorTable.h"
35#include "GenType.h"
36
[10a7775]37#include "InitTweak/InitTweak.h"
38
[51b73452]39using namespace std;
40
41namespace CodeGen {
[6c4ff37]42 int CodeGenerator::tabsize = 4;
[51587aa]43
[145f1fc]44 // the kinds of statements that would ideally be followed by whitespace
[2b6c1e0]45 bool wantSpacing( Statement * stmt) {
46 return dynamic_cast< IfStmt * >( stmt ) || dynamic_cast< CompoundStmt * >( stmt ) ||
[08061589]47 dynamic_cast< WhileStmt * >( stmt ) || dynamic_cast< ForStmt * >( stmt ) || dynamic_cast< SwitchStmt *>( stmt );
[2b6c1e0]48 }
49
[8688ce1]50 void CodeGenerator::extension( Expression * expr ) {
[8e9cbb2]51 if ( expr->get_extension() ) {
52 output << "__extension__ ";
53 } // if
54 } // extension
55
[8688ce1]56 void CodeGenerator::extension( Declaration * decl ) {
[8e9cbb2]57 if ( decl->get_extension() ) {
58 output << "__extension__ ";
59 } // if
60 } // extension
61
[58dd019]62 void CodeGenerator::asmName( DeclarationWithType * decl ) {
63 if ( ConstantExpr * asmName = decl->get_asmName() ) {
64 output << " asm ( " << asmName->get_constant()->get_value() << " )";
65 } // if
66 } // extension
67
[888cbe4]68 ostream & CodeGenerator::Indenter::operator()( ostream & output ) const {
[cda48b6]69 return output << string( cg.cur_indent, ' ' );
70 }
71
[888cbe4]72 ostream & operator<<( ostream & output, const CodeGenerator::Indenter &indent ) {
[cda48b6]73 return indent( output );
74 }
[51587aa]75
[888cbe4]76 CodeGenerator::LabelPrinter & CodeGenerator::LabelPrinter::operator()( std::list< Label > & l ) {
77 labels = &l;
78 return *this;
79 }
80
[8688ce1]81 ostream & operator<<( ostream & output, CodeGenerator::LabelPrinter & printLabels ) {
[888cbe4]82 std::list< Label > & labs = *printLabels.labels;
83 // l.unique(); // assumes a sorted list. Why not use set? Does order matter?
84 for ( Label & l : labs ) {
85 output << l.get_name() + ": ";
86 printLabels.cg.genAttributes( l.get_attributes() );
[8688ce1]87 } // for
[888cbe4]88 return output;
89 }
90
[35b1bf4]91 CodeGenerator::CodeGenerator( std::ostream & os, bool pretty ) : indent( *this), cur_indent( 0 ), insideFunction( false ), output( os ), printLabels( *this ), pretty( pretty ) {}
[cda48b6]92
[8688ce1]93 CodeGenerator::CodeGenerator( std::ostream & os, std::string init, int indentation, bool infunp )
[888cbe4]94 : indent( *this), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( *this ) {
[6c4ff37]95 //output << std::string( init );
[51587aa]96 }
97
[8688ce1]98 CodeGenerator::CodeGenerator( std::ostream & os, char * init, int indentation, bool infunp )
[888cbe4]99 : indent( *this ), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( *this ) {
[6c4ff37]100 //output << std::string( init );
[51587aa]101 }
102
[486341f]103 string CodeGenerator::mangleName( DeclarationWithType * decl ) {
[35b1bf4]104 if ( pretty ) return decl->get_name();
[51587aa]105 if ( decl->get_mangleName() != "" ) {
[f326f99]106 // need to incorporate scope level in order to differentiate names for destructors
107 return decl->get_scopedMangleName();
[51587aa]108 } else {
109 return decl->get_name();
110 } // if
111 }
[94b4364]112
[44a81853]113 void CodeGenerator::genAttributes( list< Attribute * > & attributes ) {
114 if ( attributes.empty() ) return;
115 output << "__attribute__ ((";
116 for ( list< Attribute * >::iterator attr( attributes.begin() );; ) {
117 output << (*attr)->get_name();
118 if ( ! (*attr)->get_parameters().empty() ) {
119 output << "(";
120 genCommaList( (*attr)->get_parameters().begin(), (*attr)->get_parameters().end() );
121 output << ")";
122 } // if
123 if ( ++attr == attributes.end() ) break;
124 output << ","; // separator
125 } // for
126 output << ")) ";
127 } // CodeGenerator::genAttributes
[7baed7d]128
129
130 //*** Declarations
[8688ce1]131 void CodeGenerator::visit( FunctionDecl * functionDecl ) {
[8e9cbb2]132 extension( functionDecl );
[7baed7d]133 genAttributes( functionDecl->get_attributes() );
134
[51587aa]135 handleStorageClass( functionDecl );
[6e8bd43]136 functionDecl->get_funcSpec().print( output );
[dd020c0]137
[35b1bf4]138 output << genType( functionDecl->get_functionType(), mangleName( functionDecl ), pretty );
[51587aa]139
[58dd019]140 asmName( functionDecl );
141
[51587aa]142 // acceptAll( functionDecl->get_oldDecls(), *this );
143 if ( functionDecl->get_statements() ) {
[7f5566b]144 functionDecl->get_statements()->accept( *this );
[51587aa]145 } // if
146 }
147
[8688ce1]148 void CodeGenerator::visit( ObjectDecl * objectDecl ) {
[d9c8a59]149 if (objectDecl->get_name().empty()) {
150 static UniqueName name = { "__anonymous_object" };
151 objectDecl->set_name( name.newName() );
152 }
153
[8e9cbb2]154 extension( objectDecl );
[f9cebb5]155 genAttributes( objectDecl->get_attributes() );
156
[51587aa]157 handleStorageClass( objectDecl );
[35b1bf4]158 output << genType( objectDecl->get_type(), mangleName( objectDecl ), pretty );
[71f4e4f]159
[58dd019]160 asmName( objectDecl );
161
[51587aa]162 if ( objectDecl->get_init() ) {
[6c4ff37]163 output << " = ";
[51587aa]164 objectDecl->get_init()->accept( *this );
165 } // if
[3778cb2]166
[51587aa]167 if ( objectDecl->get_bitfieldWidth() ) {
[6c4ff37]168 output << ":";
[51587aa]169 objectDecl->get_bitfieldWidth()->accept( *this );
170 } // if
171 }
172
[8688ce1]173 void CodeGenerator::handleAggregate( AggregateDecl * aggDecl ) {
[c0aa336]174 genAttributes( aggDecl->get_attributes() );
[35b1bf4]175
[51587aa]176 if ( aggDecl->get_name() != "" )
[6c4ff37]177 output << aggDecl->get_name();
[71f4e4f]178
[2c57025]179 // std::list< Declaration * > & memb = aggDecl->get_members();
180 // if ( ! memb.empty() ) {
181 if ( aggDecl->has_body() ) {
182 std::list< Declaration * > & memb = aggDecl->get_members();
[94b4364]183 output << " {" << endl;
[51587aa]184
[71f4e4f]185 cur_indent += CodeGenerator::tabsize;
[3778cb2]186 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
[71f4e4f]187 output << indent;
[7f5566b]188 (*i)->accept( *this );
[6c4ff37]189 output << ";" << endl;
[3778cb2]190 } // for
[51587aa]191
[71f4e4f]192 cur_indent -= CodeGenerator::tabsize;
[51587aa]193
[cda48b6]194 output << indent << "}";
[17cd4eb]195 } // if
[51587aa]196 }
[17cd4eb]197
[8688ce1]198 void CodeGenerator::visit( StructDecl * structDecl ) {
[8e9cbb2]199 extension( structDecl );
[6c4ff37]200 output << "struct ";
[51587aa]201 handleAggregate( structDecl );
202 }
[17cd4eb]203
[8688ce1]204 void CodeGenerator::visit( UnionDecl * unionDecl ) {
[8e9cbb2]205 extension( unionDecl );
[6c4ff37]206 output << "union ";
[8e9cbb2]207 handleAggregate( unionDecl );
[51587aa]208 }
[71f4e4f]209
[8688ce1]210 void CodeGenerator::visit( EnumDecl * enumDecl ) {
[8e9cbb2]211 extension( enumDecl );
[6c4ff37]212 output << "enum ";
[c0aa336]213 genAttributes( enumDecl->get_attributes() );
[51587aa]214
[8e9cbb2]215 if ( enumDecl->get_name() != "" )
216 output << enumDecl->get_name();
[71f4e4f]217
[8e9cbb2]218 std::list< Declaration* > &memb = enumDecl->get_members();
[51587aa]219
220 if ( ! memb.empty() ) {
[cda48b6]221 output << " {" << endl;
[51587aa]222
[71f4e4f]223 cur_indent += CodeGenerator::tabsize;
[51587aa]224 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
[8688ce1]225 ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
[51587aa]226 assert( obj );
[71f4e4f]227 output << indent << mangleName( obj );
[51587aa]228 if ( obj->get_init() ) {
[6c4ff37]229 output << " = ";
[7f5566b]230 obj->get_init()->accept( *this );
[51587aa]231 } // if
[6c4ff37]232 output << "," << endl;
[51587aa]233 } // for
234
[71f4e4f]235 cur_indent -= CodeGenerator::tabsize;
[51587aa]236
[cda48b6]237 output << indent << "}";
[51587aa]238 } // if
239 }
[71f4e4f]240
[8688ce1]241 void CodeGenerator::visit( TraitDecl * traitDecl ) {}
[71f4e4f]242
[8688ce1]243 void CodeGenerator::visit( TypedefDecl * typeDecl ) {
[8e9cbb2]244 assert( false && "Typedefs are removed and substituted in earlier passes." );
245 //output << "typedef ";
[35b1bf4]246 //output << genType( typeDecl->get_base(), typeDecl->get_name(), pretty );
[51587aa]247 }
[71f4e4f]248
[8688ce1]249 void CodeGenerator::visit( TypeDecl * typeDecl ) {
[51587aa]250 // really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
251 // still to be done
[8e9cbb2]252 extension( typeDecl );
[6c4ff37]253 output << "extern unsigned long " << typeDecl->get_name();
[51587aa]254 if ( typeDecl->get_base() ) {
[35b1bf4]255 output << " = sizeof( " << genType( typeDecl->get_base(), "", pretty ) << " )";
[51587aa]256 } // if
257 }
258
[e45215c]259 void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
260 typedef std::list< Expression * > DesignatorList;
261 if ( designators.size() == 0 ) return;
262 for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
[8a4da06]263 if ( dynamic_cast< NameExpr * >( *iter ) ) {
[f32c7f4]264 // if expression is a name, then initializing aggregate member
265 output << ".";
266 (*iter)->accept( *this );
267 } else {
268 // if not a simple name, it has to be a constant expression, i.e. an array designator
[e45215c]269 output << "[";
270 (*iter)->accept( *this );
271 output << "]";
[3778cb2]272 } // if
273 } // for
[e45215c]274 output << " = ";
275 }
276
[8688ce1]277 void CodeGenerator::visit( SingleInit * init ) {
[e45215c]278 printDesignators( init->get_designators() );
[51587aa]279 init->get_value()->accept( *this );
280 }
281
[8688ce1]282 void CodeGenerator::visit( ListInit * init ) {
[e45215c]283 printDesignators( init->get_designators() );
[6c4ff37]284 output << "{ ";
[4d2434a]285 if ( init->begin() == init->end() ) {
[8e9cbb2]286 // illegal to leave initializer list empty for scalar initializers, but always legal to have 0
[5b40f30]287 output << "0";
288 } else {
[4d2434a]289 genCommaList( init->begin(), init->end() );
[8688ce1]290 } // if
[6c4ff37]291 output << " }";
[51587aa]292 }
293
[fc638d2]294 void CodeGenerator::visit( ConstructorInit * init ){
295 assertf( false, "ConstructorInit nodes should not make it to CodeGen." );
296 }
297
[8688ce1]298 void CodeGenerator::visit( Constant * constant ) {
[6c4ff37]299 output << constant->get_value() ;
[51587aa]300 }
301
302 //*** Expressions
[8688ce1]303 void CodeGenerator::visit( ApplicationExpr * applicationExpr ) {
[e04ef3a]304 extension( applicationExpr );
[8688ce1]305 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
[51587aa]306 OperatorInfo opInfo;
307 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
308 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
309 switch ( opInfo.type ) {
310 case OT_PREFIXASSIGN:
311 case OT_POSTFIXASSIGN:
312 case OT_INFIXASSIGN:
[356189a]313 case OT_CTOR:
[c2ce2350]314 case OT_DTOR:
[51587aa]315 {
316 assert( arg != applicationExpr->get_args().end() );
[8688ce1]317 if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) {
[356189a]318 // remove & from first assignment/ctor argument
[51587aa]319 *arg = addrExpr->get_arg();
320 } else {
[356189a]321 // no address-of operator, so must be a pointer - add dereference
[066d77a]322 // NOTE: if the assertion starts to trigger, check that the application expr isn't being shared.
323 // Since its arguments are modified here, this assertion most commonly triggers when the application
324 // is visited multiple times.
[8688ce1]325 UntypedExpr * newExpr = new UntypedExpr( new NameExpr( "*?" ) );
[51587aa]326 newExpr->get_args().push_back( *arg );
[906e24d]327 Type * type = InitTweak::getPointerBase( (*arg)->get_result() );
[066d77a]328 assertf( type, "First argument to a derefence must be a pointer. Ensure that expressions are not being shared." );
[906e24d]329 newExpr->set_result( type->clone() );
[51587aa]330 *arg = newExpr;
331 } // if
332 break;
333 }
[71f4e4f]334
[51587aa]335 default:
336 // do nothing
337 ;
[3778cb2]338 } // switch
[71f4e4f]339
[51587aa]340 switch ( opInfo.type ) {
341 case OT_INDEX:
342 assert( applicationExpr->get_args().size() == 2 );
343 (*arg++)->accept( *this );
[6c4ff37]344 output << "[";
[51587aa]345 (*arg)->accept( *this );
[6c4ff37]346 output << "]";
[51587aa]347 break;
[71f4e4f]348
[51587aa]349 case OT_CALL:
[356189a]350 // there are no intrinsic definitions of the function call operator
[51587aa]351 assert( false );
352 break;
[71f4e4f]353
[f1e012b]354 case OT_CTOR:
[c2ce2350]355 case OT_DTOR:
[356189a]356 if ( applicationExpr->get_args().size() == 1 ) {
[8e9cbb2]357 // the expression fed into a single parameter constructor or destructor may contain side
358 // effects, so must still output this expression
[64071c2]359 output << "(";
[356189a]360 (*arg++)->accept( *this );
[64071c2]361 output << ") /* " << opInfo.inputName << " */";
[356189a]362 } else if ( applicationExpr->get_args().size() == 2 ) {
[c2ce2350]363 // intrinsic two parameter constructors are essentially bitwise assignment
[356189a]364 output << "(";
365 (*arg++)->accept( *this );
366 output << opInfo.symbol;
367 (*arg)->accept( *this );
[c2ce2350]368 output << ") /* " << opInfo.inputName << " */";
[356189a]369 } else {
[c2ce2350]370 // no constructors with 0 or more than 2 parameters
[356189a]371 assert( false );
[8688ce1]372 } // if
[356189a]373 break;
[f1e012b]374
[51587aa]375 case OT_PREFIX:
376 case OT_PREFIXASSIGN:
377 assert( applicationExpr->get_args().size() == 1 );
[6c4ff37]378 output << "(";
379 output << opInfo.symbol;
[51587aa]380 (*arg)->accept( *this );
[6c4ff37]381 output << ")";
[51587aa]382 break;
[71f4e4f]383
[51587aa]384 case OT_POSTFIX:
385 case OT_POSTFIXASSIGN:
386 assert( applicationExpr->get_args().size() == 1 );
387 (*arg)->accept( *this );
[6c4ff37]388 output << opInfo.symbol;
[51587aa]389 break;
390
[f1e012b]391
[51587aa]392 case OT_INFIX:
393 case OT_INFIXASSIGN:
394 assert( applicationExpr->get_args().size() == 2 );
[6c4ff37]395 output << "(";
[51587aa]396 (*arg++)->accept( *this );
[6c4ff37]397 output << opInfo.symbol;
[51587aa]398 (*arg)->accept( *this );
[6c4ff37]399 output << ")";
[51587aa]400 break;
[71f4e4f]401
[51587aa]402 case OT_CONSTANT:
[721f17a]403 case OT_LABELADDRESS:
404 // there are no intrinsic definitions of 0/1 or label addresses as functions
[51587aa]405 assert( false );
[3778cb2]406 } // switch
[17cd4eb]407 } else {
[51587aa]408 varExpr->accept( *this );
[6c4ff37]409 output << "(";
[51587aa]410 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]411 output << ")";
[17cd4eb]412 } // if
[51587aa]413 } else {
414 applicationExpr->get_function()->accept( *this );
[6c4ff37]415 output << "(";
[51587aa]416 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]417 output << ")";
[51587aa]418 } // if
419 }
[71f4e4f]420
[8688ce1]421 void CodeGenerator::visit( UntypedExpr * untypedExpr ) {
[e04ef3a]422 extension( untypedExpr );
[8688ce1]423 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
[51587aa]424 OperatorInfo opInfo;
425 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
426 std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
427 switch ( opInfo.type ) {
428 case OT_INDEX:
429 assert( untypedExpr->get_args().size() == 2 );
430 (*arg++)->accept( *this );
[6c4ff37]431 output << "[";
[51587aa]432 (*arg)->accept( *this );
[6c4ff37]433 output << "]";
[51587aa]434 break;
[71f4e4f]435
[51587aa]436 case OT_CALL:
[f1e012b]437 assert( false );
438
[c2ce2350]439 case OT_CTOR:
440 case OT_DTOR:
441 if ( untypedExpr->get_args().size() == 1 ) {
[8e9cbb2]442 // the expression fed into a single parameter constructor or destructor may contain side
443 // effects, so must still output this expression
[64071c2]444 output << "(";
[c2ce2350]445 (*arg++)->accept( *this );
[64071c2]446 output << ") /* " << opInfo.inputName << " */";
[c2ce2350]447 } else if ( untypedExpr->get_args().size() == 2 ) {
448 // intrinsic two parameter constructors are essentially bitwise assignment
449 output << "(";
450 (*arg++)->accept( *this );
451 output << opInfo.symbol;
452 (*arg)->accept( *this );
453 output << ") /* " << opInfo.inputName << " */";
454 } else {
455 // no constructors with 0 or more than 2 parameters
456 assert( false );
[3778cb2]457 } // if
[51587aa]458 break;
[71f4e4f]459
[51587aa]460 case OT_PREFIX:
461 case OT_PREFIXASSIGN:
[de62360d]462 case OT_LABELADDRESS:
[51587aa]463 assert( untypedExpr->get_args().size() == 1 );
[6c4ff37]464 output << "(";
465 output << opInfo.symbol;
[51587aa]466 (*arg)->accept( *this );
[6c4ff37]467 output << ")";
[51587aa]468 break;
[71f4e4f]469
[51587aa]470 case OT_POSTFIX:
471 case OT_POSTFIXASSIGN:
472 assert( untypedExpr->get_args().size() == 1 );
473 (*arg)->accept( *this );
[6c4ff37]474 output << opInfo.symbol;
[51587aa]475 break;
[71f4e4f]476
[51587aa]477 case OT_INFIX:
478 case OT_INFIXASSIGN:
479 assert( untypedExpr->get_args().size() == 2 );
[6c4ff37]480 output << "(";
[51587aa]481 (*arg++)->accept( *this );
[6c4ff37]482 output << opInfo.symbol;
[51587aa]483 (*arg)->accept( *this );
[6c4ff37]484 output << ")";
[51587aa]485 break;
[71f4e4f]486
[51587aa]487 case OT_CONSTANT:
488 // there are no intrinsic definitions of 0 or 1 as functions
489 assert( false );
[3778cb2]490 } // switch
[51587aa]491 } else {
[8688ce1]492 if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
[ac911f4]493 assert( untypedExpr->get_args().size() == 2 );
494 (*untypedExpr->get_args().begin())->accept( *this );
495 output << " ... ";
496 (*--untypedExpr->get_args().end())->accept( *this );
[057b34f]497 } else { // builtin routines
498 nameExpr->accept( *this );
499 output << "(";
500 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
501 output << ")";
[66d12f7]502 } // if
[51587aa]503 } // if
504 } else {
505 untypedExpr->get_function()->accept( *this );
[6c4ff37]506 output << "(";
[51587aa]507 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
[6c4ff37]508 output << ")";
[51587aa]509 } // if
510 }
[71f4e4f]511
[064e3ff]512 void CodeGenerator::visit( RangeExpr * rangeExpr ) {
513 rangeExpr->get_low()->accept( *this );
514 output << " ... ";
515 rangeExpr->get_high()->accept( *this );
516 }
517
[8688ce1]518 void CodeGenerator::visit( NameExpr * nameExpr ) {
[e04ef3a]519 extension( nameExpr );
[51587aa]520 OperatorInfo opInfo;
521 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
522 assert( opInfo.type == OT_CONSTANT );
[6c4ff37]523 output << opInfo.symbol;
[51587aa]524 } else {
[6c4ff37]525 output << nameExpr->get_name();
[51587aa]526 } // if
527 }
[71f4e4f]528
[8688ce1]529 void CodeGenerator::visit( AddressExpr * addressExpr ) {
[e04ef3a]530 extension( addressExpr );
[6c4ff37]531 output << "(&";
[51587aa]532 // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
[8688ce1]533 if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
[6c4ff37]534 output << mangleName( variableExpr->get_var() );
[51587aa]535 } else {
536 addressExpr->get_arg()->accept( *this );
537 } // if
[6c4ff37]538 output << ")";
[51587aa]539 }
540
[8688ce1]541 void CodeGenerator::visit( CastExpr * castExpr ) {
[e04ef3a]542 extension( castExpr );
[803deb1]543 output << "(";
[906e24d]544 if ( castExpr->get_result()->isVoid() ) {
[803deb1]545 output << "(void)" ;
[615a096]546 } else if ( ! castExpr->get_result()->get_lvalue() ) {
[803deb1]547 // at least one result type of cast, but not an lvalue
548 output << "(";
[35b1bf4]549 output << genType( castExpr->get_result(), "", pretty );
[71f4e4f]550 output << ")";
[803deb1]551 } else {
[8e9cbb2]552 // otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
[803deb1]553 // never an lvalue in C
[3778cb2]554 } // if
[803deb1]555 castExpr->get_arg()->accept( *this );
556 output << ")";
[51587aa]557 }
[71f4e4f]558
[8688ce1]559 void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) {
[51587aa]560 assert( false );
561 }
[71f4e4f]562
[8688ce1]563 void CodeGenerator::visit( MemberExpr * memberExpr ) {
[e04ef3a]564 extension( memberExpr );
[51587aa]565 memberExpr->get_aggregate()->accept( *this );
[6c4ff37]566 output << "." << mangleName( memberExpr->get_member() );
[51587aa]567 }
[71f4e4f]568
[8688ce1]569 void CodeGenerator::visit( VariableExpr * variableExpr ) {
[e04ef3a]570 extension( variableExpr );
[51587aa]571 OperatorInfo opInfo;
572 if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
[6c4ff37]573 output << opInfo.symbol;
[51587aa]574 } else {
[6c4ff37]575 output << mangleName( variableExpr->get_var() );
[51587aa]576 } // if
577 }
[71f4e4f]578
[8688ce1]579 void CodeGenerator::visit( ConstantExpr * constantExpr ) {
[51587aa]580 assert( constantExpr->get_constant() );
[e04ef3a]581 extension( constantExpr );
[51587aa]582 constantExpr->get_constant()->accept( *this );
583 }
[71f4e4f]584
[8688ce1]585 void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
[e04ef3a]586 extension( sizeofExpr );
[6c4ff37]587 output << "sizeof(";
[51587aa]588 if ( sizeofExpr->get_isType() ) {
[35b1bf4]589 output << genType( sizeofExpr->get_type(), "", pretty );
[51587aa]590 } else {
591 sizeofExpr->get_expr()->accept( *this );
592 } // if
[6c4ff37]593 output << ")";
[51587aa]594 }
[47534159]595
[8688ce1]596 void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
[47534159]597 // use GCC extension to avoid bumping std to C11
[8e9cbb2]598 extension( alignofExpr );
[47534159]599 output << "__alignof__(";
[25a054f]600 if ( alignofExpr->get_isType() ) {
[35b1bf4]601 output << genType( alignofExpr->get_type(), "", pretty );
[47534159]602 } else {
[25a054f]603 alignofExpr->get_expr()->accept( *this );
[47534159]604 } // if
605 output << ")";
606 }
[71f4e4f]607
[8688ce1]608 void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
[8e9cbb2]609 assert( false && "UntypedOffsetofExpr should not reach code generation." );
[2a4b088]610 }
611
[8688ce1]612 void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
[25a054f]613 // use GCC builtin
614 output << "__builtin_offsetof(";
[35b1bf4]615 output << genType( offsetofExpr->get_type(), "", pretty );
[e551c69]616 output << ", " << mangleName( offsetofExpr->get_member() );
[25a054f]617 output << ")";
618 }
[d63eeb0]619
[8688ce1]620 void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
[8e9cbb2]621 assert( false && "OffsetPackExpr should not reach code generation." );
[afc1045]622 }
[70a06f6]623
[8688ce1]624 void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
[e04ef3a]625 extension( logicalExpr );
[6c4ff37]626 output << "(";
[51587aa]627 logicalExpr->get_arg1()->accept( *this );
628 if ( logicalExpr->get_isAnd() ) {
[6c4ff37]629 output << " && ";
[51587aa]630 } else {
[6c4ff37]631 output << " || ";
[51587aa]632 } // if
633 logicalExpr->get_arg2()->accept( *this );
[6c4ff37]634 output << ")";
[51587aa]635 }
[71f4e4f]636
[8688ce1]637 void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
[e04ef3a]638 extension( conditionalExpr );
[6c4ff37]639 output << "(";
[51587aa]640 conditionalExpr->get_arg1()->accept( *this );
[6c4ff37]641 output << " ? ";
[51587aa]642 conditionalExpr->get_arg2()->accept( *this );
[6c4ff37]643 output << " : ";
[51587aa]644 conditionalExpr->get_arg3()->accept( *this );
[6c4ff37]645 output << ")";
[51587aa]646 }
[71f4e4f]647
[8688ce1]648 void CodeGenerator::visit( CommaExpr * commaExpr ) {
[e04ef3a]649 extension( commaExpr );
[6c4ff37]650 output << "(";
[51587aa]651 commaExpr->get_arg1()->accept( *this );
[6c4ff37]652 output << " , ";
[51587aa]653 commaExpr->get_arg2()->accept( *this );
[6c4ff37]654 output << ")";
[51587aa]655 }
[71f4e4f]656
[907eccb]657 void CodeGenerator::visit( UntypedTupleExpr * tupleExpr ) { assertf( false, "UntypedTupleExpr should not make it to Code Gen" ); }
658
659 void CodeGenerator::visit( TupleExpr * tupleExpr ) { assertf( false, "TupleExpr should not make it to Code Gen" ); }
[71f4e4f]660
[8688ce1]661 void CodeGenerator::visit( TypeExpr * typeExpr ) {}
[2b6c1e0]662
[8688ce1]663 void CodeGenerator::visit( AsmExpr * asmExpr ) {
[7f5566b]664 if ( asmExpr->get_inout() ) {
665 output << "[ ";
666 asmExpr->get_inout()->accept( *this );
667 output << " ] ";
668 } // if
669 asmExpr->get_constraint()->accept( *this );
670 output << " ( ";
671 asmExpr->get_operand()->accept( *this );
672 output << " )";
673 }
674
[3c13c03]675 void CodeGenerator::visit( CompoundLiteralExpr *compLitExpr ) {
[fbcde64]676 assert( compLitExpr->get_result() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
677 output << "(" << genType( compLitExpr->get_result(), "", pretty ) << ")";
[3c13c03]678 compLitExpr->get_initializer()->accept( *this );
679 }
680
[6eb8948]681 void CodeGenerator::visit( StmtExpr * stmtExpr ) {
[3c13c03]682 std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
683 output << "({" << std::endl;
684 cur_indent += CodeGenerator::tabsize;
685 unsigned int numStmts = stmts.size();
686 unsigned int i = 0;
687 for ( Statement * stmt : stmts ) {
688 output << indent << printLabels( stmt->get_labels() );
689 if ( i+1 == numStmts ) {
690 // last statement in a statement expression needs to be handled specially -
691 // cannot cast to void, otherwise the expression statement has no value
692 if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
693 exprStmt->get_expr()->accept( *this );
694 output << ";" << endl;
695 ++i;
696 break;
697 }
698 }
699 stmt->accept( *this );
700 output << endl;
701 if ( wantSpacing( stmt ) ) {
702 output << endl;
703 } // if
704 ++i;
705 }
706 cur_indent -= CodeGenerator::tabsize;
707 output << indent << "})";
[6eb8948]708 }
709
[51587aa]710 //*** Statements
[8688ce1]711 void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
[51587aa]712 std::list<Statement*> ks = compoundStmt->get_kids();
[2b6c1e0]713 output << "{" << endl;
[51587aa]714
[2b6c1e0]715 cur_indent += CodeGenerator::tabsize;
[51587aa]716
[7f5566b]717 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
[cda48b6]718 output << indent << printLabels( (*i)->get_labels() );
[7f5566b]719 (*i)->accept( *this );
[2b6c1e0]720
[6c4ff37]721 output << endl;
[2b6c1e0]722 if ( wantSpacing( *i ) ) {
723 output << endl;
[3778cb2]724 } // if
[8688ce1]725 } // for
[71f4e4f]726 cur_indent -= CodeGenerator::tabsize;
[51587aa]727
[cda48b6]728 output << indent << "}";
[51587aa]729 }
730
[8688ce1]731 void CodeGenerator::visit( ExprStmt * exprStmt ) {
[6c4ff37]732 assert( exprStmt );
[321a2481]733 // cast the top-level expression to void to reduce gcc warnings.
734 Expression * expr = new CastExpr( exprStmt->get_expr() );
735 expr->accept( *this );
736 output << ";";
[51587aa]737 }
738
[8688ce1]739 void CodeGenerator::visit( AsmStmt * asmStmt ) {
[7f5566b]740 output << "asm ";
741 if ( asmStmt->get_voltile() ) output << "volatile ";
742 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
743 output << "( ";
744 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
745 output << " : ";
746 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
747 output << " : ";
748 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
749 output << " : ";
750 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
751 if ( ! asmStmt->get_gotolabels().empty() ) {
752 output << " : ";
753 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
754 output << *begin++;
755 if ( begin == asmStmt->get_gotolabels().end() ) break;
756 output << ", ";
757 } // for
758 } // if
759 output << " );" ;
760 }
761
[e994912]762 void CodeGenerator::visit( AsmDecl * asmDecl ) {
763 output << "asm ";
764 AsmStmt * asmStmt = asmDecl->get_stmt();
765 output << "( ";
766 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
767 output << " )" ;
768 }
769
[8688ce1]770 void CodeGenerator::visit( IfStmt * ifStmt ) {
[7f5566b]771 output << "if ( ";
772 ifStmt->get_condition()->accept( *this );
773 output << " ) ";
[51587aa]774
[7f5566b]775 ifStmt->get_thenPart()->accept( *this );
[51587aa]776
777 if ( ifStmt->get_elsePart() != 0) {
[2b6c1e0]778 output << " else ";
[7f5566b]779 ifStmt->get_elsePart()->accept( *this );
[51587aa]780 } // if
781 }
782
[8688ce1]783 void CodeGenerator::visit( SwitchStmt * switchStmt ) {
[7f5566b]784 output << "switch ( " ;
785 switchStmt->get_condition()->accept( *this );
786 output << " ) ";
[71f4e4f]787
[2b6c1e0]788 output << "{" << std::endl;
[6c4ff37]789 cur_indent += CodeGenerator::tabsize;
[8688ce1]790 acceptAll( switchStmt->get_statements(), *this );
[6c4ff37]791 cur_indent -= CodeGenerator::tabsize;
[cda48b6]792 output << indent << "}";
[51587aa]793 }
794
[8688ce1]795 void CodeGenerator::visit( CaseStmt * caseStmt ) {
[cda48b6]796 output << indent;
[eb3261f]797 if ( caseStmt->isDefault()) {
[2b6c1e0]798 output << "default";
[eb3261f]799 } else {
[2b6c1e0]800 output << "case ";
[7f5566b]801 caseStmt->get_condition()->accept( *this );
[17cd4eb]802 } // if
[6c4ff37]803 output << ":\n";
[71f4e4f]804
[51587aa]805 std::list<Statement *> sts = caseStmt->get_statements();
806
[6c4ff37]807 cur_indent += CodeGenerator::tabsize;
[51587aa]808 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
[cda48b6]809 output << indent << printLabels( (*i)->get_labels() ) ;
[7f5566b]810 (*i)->accept( *this );
[6c4ff37]811 output << endl;
[3778cb2]812 } // for
[6c4ff37]813 cur_indent -= CodeGenerator::tabsize;
[51587aa]814 }
815
[8688ce1]816 void CodeGenerator::visit( BranchStmt * branchStmt ) {
[51587aa]817 switch ( branchStmt->get_type()) {
818 case BranchStmt::Goto:
819 if ( ! branchStmt->get_target().empty() )
[6c4ff37]820 output << "goto " << branchStmt->get_target();
[71f4e4f]821 else {
[51587aa]822 if ( branchStmt->get_computedTarget() != 0 ) {
[6c4ff37]823 output << "goto *";
[51587aa]824 branchStmt->get_computedTarget()->accept( *this );
825 } // if
826 } // if
827 break;
828 case BranchStmt::Break:
[6c4ff37]829 output << "break";
[51587aa]830 break;
831 case BranchStmt::Continue:
[6c4ff37]832 output << "continue";
[51587aa]833 break;
[3778cb2]834 } // switch
[2b6c1e0]835 output << ";";
[51587aa]836 }
837
[8688ce1]838 void CodeGenerator::visit( ReturnStmt * returnStmt ) {
[6c4ff37]839 output << "return ";
[4b2589a]840 maybeAccept( returnStmt->get_expr(), *this );
[6c4ff37]841 output << ";";
[51587aa]842 }
843
[8688ce1]844 void CodeGenerator::visit( WhileStmt * whileStmt ) {
[321a2481]845 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]846 output << "do" ;
[321a2481]847 } else {
[6c4ff37]848 output << "while (" ;
[7f5566b]849 whileStmt->get_condition()->accept( *this );
[6c4ff37]850 output << ")";
[51587aa]851 } // if
[2b6c1e0]852 output << " ";
[51587aa]853
[2b6c1e0]854 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
[51587aa]855 whileStmt->get_body()->accept( *this );
856
[cda48b6]857 output << indent;
[51587aa]858
859 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]860 output << " while (" ;
[7f5566b]861 whileStmt->get_condition()->accept( *this );
[6c4ff37]862 output << ");";
[51587aa]863 } // if
864 }
865
[8688ce1]866 void CodeGenerator::visit( ForStmt * forStmt ) {
[8e9cbb2]867 // initialization is always hoisted, so don't bother doing anything with that
[145f1fc]868 output << "for (;";
[51587aa]869
[321a2481]870 if ( forStmt->get_condition() != 0 ) {
[51587aa]871 forStmt->get_condition()->accept( *this );
[3778cb2]872 } // if
[6c4ff37]873 output << ";";
[51587aa]874
[321a2481]875 if ( forStmt->get_increment() != 0 ) {
876 // cast the top-level expression to void to reduce gcc warnings.
877 Expression * expr = new CastExpr( forStmt->get_increment() );
878 expr->accept( *this );
[3778cb2]879 } // if
[2b6c1e0]880 output << ") ";
[51587aa]881
882 if ( forStmt->get_body() != 0 ) {
[2b6c1e0]883 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
[51587aa]884 forStmt->get_body()->accept( *this );
885 } // if
886 }
887
[8688ce1]888 void CodeGenerator::visit( NullStmt * nullStmt ) {
[cda48b6]889 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
[6c4ff37]890 output << "/* null statement */ ;";
[51587aa]891 }
892
[8688ce1]893 void CodeGenerator::visit( DeclStmt * declStmt ) {
[51587aa]894 declStmt->get_decl()->accept( *this );
[71f4e4f]895
[51587aa]896 if ( doSemicolon( declStmt->get_decl() ) ) {
[6c4ff37]897 output << ";";
[51587aa]898 } // if
899 }
900
[dd020c0]901 void CodeGenerator::handleStorageClass( DeclarationWithType * decl ) {
[fb04321]902 if ( decl->get_storageClasses().any() ) {
[6e8bd43]903 decl->get_storageClasses().print( output );
[a7c90d4]904 } // if
[dd020c0]905 } // CodeGenerator::handleStorageClass
[9facf3b]906
907 std::string genName( DeclarationWithType * decl ) {
908 CodeGen::OperatorInfo opInfo;
909 if ( operatorLookup( decl->get_name(), opInfo ) ) {
910 return opInfo.outputName;
911 } else {
912 return decl->get_name();
913 } // if
914 }
[51b73452]915} // namespace CodeGen
[51587aa]916
917// Local Variables: //
918// tab-width: 4 //
919// mode: c++ //
920// compile-command: "make install" //
921// End: //
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