source: src/CodeGen/CodeGenerator.cc@ 7350ff97

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 7350ff97 was 907eccb, checked in by Rob Schluntz <rschlunt@…>, 9 years ago

added UntypedTupleExpr to better differentiate typed and untyped contexts, simplifying some code
  • Property mode set to 100644
File size: 27.6 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
[58dd019]12// Last Modified On : Tue Dec 13 14:51:27 2016
13// Update Count : 362
[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
[486341f]91 CodeGenerator::CodeGenerator( std::ostream & os, bool mangle ) : indent( *this), cur_indent( 0 ), insideFunction( false ), output( os ), printLabels( *this ), mangle( mangle ) {}
[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 ) {
104 if ( ! mangle ) 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
[7baed7d]113 void CodeGenerator::genAttributes( std::list< Attribute * > & attributes ) {
114 if ( ! attributes.empty() ) {
115 output << "__attribute__ ((";
116 for ( Attribute *& attr : attributes ) {
117 if ( ! attr->empty() ) {
118 output << attr->get_name() << "(";
119 genCommaList( attr->get_parameters().begin(), attr->get_parameters().end() );
120 output << ")";
[8688ce1]121 } // if
[7baed7d]122 output << ",";
[8688ce1]123 } // for
[7baed7d]124 output << ")) ";
[8688ce1]125 } // if
[7baed7d]126 }
127
128
129 //*** Declarations
[8688ce1]130 void CodeGenerator::visit( FunctionDecl * functionDecl ) {
[8e9cbb2]131 extension( functionDecl );
[7baed7d]132 genAttributes( functionDecl->get_attributes() );
133
[51587aa]134 handleStorageClass( functionDecl );
[f38c8d9]135 if ( functionDecl->get_isInline() ) {
[6c4ff37]136 output << "inline ";
[f38c8d9]137 } // if
[de62360d]138 if ( functionDecl->get_isNoreturn() ) {
139 output << "_Noreturn ";
140 } // if
[6c4ff37]141 output << genType( functionDecl->get_functionType(), mangleName( functionDecl ) );
[51587aa]142
143 // how to get this to the Functype?
144 std::list< Declaration * > olds = functionDecl->get_oldDecls();
145 if ( ! olds.empty() ) {
[6c4ff37]146 output << " /* function has old declaration */";
[51587aa]147 } // if
148
[58dd019]149 asmName( functionDecl );
150
[51587aa]151 // acceptAll( functionDecl->get_oldDecls(), *this );
152 if ( functionDecl->get_statements() ) {
[7f5566b]153 functionDecl->get_statements()->accept( *this );
[51587aa]154 } // if
155 }
156
[8688ce1]157 void CodeGenerator::visit( ObjectDecl * objectDecl ) {
[8e9cbb2]158 extension( objectDecl );
[f9cebb5]159 genAttributes( objectDecl->get_attributes() );
160
[51587aa]161 handleStorageClass( objectDecl );
[6c4ff37]162 output << genType( objectDecl->get_type(), mangleName( objectDecl ) );
[71f4e4f]163
[58dd019]164 asmName( objectDecl );
165
[51587aa]166 if ( objectDecl->get_init() ) {
[6c4ff37]167 output << " = ";
[51587aa]168 objectDecl->get_init()->accept( *this );
169 } // if
[3778cb2]170
[51587aa]171 if ( objectDecl->get_bitfieldWidth() ) {
[6c4ff37]172 output << ":";
[51587aa]173 objectDecl->get_bitfieldWidth()->accept( *this );
174 } // if
175 }
176
[8688ce1]177 void CodeGenerator::handleAggregate( AggregateDecl * aggDecl ) {
[51587aa]178 if ( aggDecl->get_name() != "" )
[6c4ff37]179 output << aggDecl->get_name();
[71f4e4f]180
[2c57025]181 // std::list< Declaration * > & memb = aggDecl->get_members();
182 // if ( ! memb.empty() ) {
183 if ( aggDecl->has_body() ) {
184 std::list< Declaration * > & memb = aggDecl->get_members();
[94b4364]185 output << " {" << endl;
[51587aa]186
[71f4e4f]187 cur_indent += CodeGenerator::tabsize;
[3778cb2]188 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
[71f4e4f]189 output << indent;
[7f5566b]190 (*i)->accept( *this );
[6c4ff37]191 output << ";" << endl;
[3778cb2]192 } // for
[51587aa]193
[71f4e4f]194 cur_indent -= CodeGenerator::tabsize;
[51587aa]195
[cda48b6]196 output << indent << "}";
[17cd4eb]197 } // if
[51587aa]198 }
[17cd4eb]199
[8688ce1]200 void CodeGenerator::visit( StructDecl * structDecl ) {
[8e9cbb2]201 extension( structDecl );
[6c4ff37]202 output << "struct ";
[51587aa]203 handleAggregate( structDecl );
204 }
[17cd4eb]205
[8688ce1]206 void CodeGenerator::visit( UnionDecl * unionDecl ) {
[8e9cbb2]207 extension( unionDecl );
[6c4ff37]208 output << "union ";
[8e9cbb2]209 handleAggregate( unionDecl );
[51587aa]210 }
[71f4e4f]211
[8688ce1]212 void CodeGenerator::visit( EnumDecl * enumDecl ) {
[8e9cbb2]213 extension( enumDecl );
[6c4ff37]214 output << "enum ";
[51587aa]215
[8e9cbb2]216 if ( enumDecl->get_name() != "" )
217 output << enumDecl->get_name();
[71f4e4f]218
[8e9cbb2]219 std::list< Declaration* > &memb = enumDecl->get_members();
[51587aa]220
221 if ( ! memb.empty() ) {
[cda48b6]222 output << " {" << endl;
[51587aa]223
[71f4e4f]224 cur_indent += CodeGenerator::tabsize;
[51587aa]225 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
[8688ce1]226 ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
[51587aa]227 assert( obj );
[71f4e4f]228 output << indent << mangleName( obj );
[51587aa]229 if ( obj->get_init() ) {
[6c4ff37]230 output << " = ";
[7f5566b]231 obj->get_init()->accept( *this );
[51587aa]232 } // if
[6c4ff37]233 output << "," << endl;
[51587aa]234 } // for
235
[71f4e4f]236 cur_indent -= CodeGenerator::tabsize;
[51587aa]237
[cda48b6]238 output << indent << "}";
[51587aa]239 } // if
240 }
[71f4e4f]241
[8688ce1]242 void CodeGenerator::visit( TraitDecl * traitDecl ) {}
[71f4e4f]243
[8688ce1]244 void CodeGenerator::visit( TypedefDecl * typeDecl ) {
[8e9cbb2]245 assert( false && "Typedefs are removed and substituted in earlier passes." );
246 //output << "typedef ";
247 //output << genType( typeDecl->get_base(), typeDecl->get_name() );
[51587aa]248 }
[71f4e4f]249
[8688ce1]250 void CodeGenerator::visit( TypeDecl * typeDecl ) {
[51587aa]251 // really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
252 // still to be done
[8e9cbb2]253 extension( typeDecl );
[6c4ff37]254 output << "extern unsigned long " << typeDecl->get_name();
[51587aa]255 if ( typeDecl->get_base() ) {
[6c4ff37]256 output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )";
[51587aa]257 } // if
258 }
259
[e45215c]260 void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
261 typedef std::list< Expression * > DesignatorList;
262 if ( designators.size() == 0 ) return;
263 for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
[8a4da06]264 if ( dynamic_cast< NameExpr * >( *iter ) ) {
[f32c7f4]265 // if expression is a name, then initializing aggregate member
266 output << ".";
267 (*iter)->accept( *this );
268 } else {
269 // if not a simple name, it has to be a constant expression, i.e. an array designator
[e45215c]270 output << "[";
271 (*iter)->accept( *this );
272 output << "]";
[3778cb2]273 } // if
274 } // for
[e45215c]275 output << " = ";
276 }
277
[8688ce1]278 void CodeGenerator::visit( SingleInit * init ) {
[e45215c]279 printDesignators( init->get_designators() );
[51587aa]280 init->get_value()->accept( *this );
281 }
282
[8688ce1]283 void CodeGenerator::visit( ListInit * init ) {
[e45215c]284 printDesignators( init->get_designators() );
[6c4ff37]285 output << "{ ";
[4d2434a]286 if ( init->begin() == init->end() ) {
[8e9cbb2]287 // illegal to leave initializer list empty for scalar initializers, but always legal to have 0
[5b40f30]288 output << "0";
289 } else {
[4d2434a]290 genCommaList( init->begin(), init->end() );
[8688ce1]291 } // if
[6c4ff37]292 output << " }";
[51587aa]293 }
294
[fc638d2]295 void CodeGenerator::visit( ConstructorInit * init ){
296 assertf( false, "ConstructorInit nodes should not make it to CodeGen." );
297 }
298
[8688ce1]299 void CodeGenerator::visit( Constant * constant ) {
[6c4ff37]300 output << constant->get_value() ;
[51587aa]301 }
302
303 //*** Expressions
[8688ce1]304 void CodeGenerator::visit( ApplicationExpr * applicationExpr ) {
[e04ef3a]305 extension( applicationExpr );
[8688ce1]306 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
[51587aa]307 OperatorInfo opInfo;
308 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
309 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
310 switch ( opInfo.type ) {
311 case OT_PREFIXASSIGN:
312 case OT_POSTFIXASSIGN:
313 case OT_INFIXASSIGN:
[356189a]314 case OT_CTOR:
[c2ce2350]315 case OT_DTOR:
[51587aa]316 {
317 assert( arg != applicationExpr->get_args().end() );
[8688ce1]318 if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) {
[356189a]319 // remove & from first assignment/ctor argument
[51587aa]320 *arg = addrExpr->get_arg();
321 } else {
[356189a]322 // no address-of operator, so must be a pointer - add dereference
[066d77a]323 // NOTE: if the assertion starts to trigger, check that the application expr isn't being shared.
324 // Since its arguments are modified here, this assertion most commonly triggers when the application
325 // is visited multiple times.
[8688ce1]326 UntypedExpr * newExpr = new UntypedExpr( new NameExpr( "*?" ) );
[51587aa]327 newExpr->get_args().push_back( *arg );
[906e24d]328 Type * type = InitTweak::getPointerBase( (*arg)->get_result() );
[066d77a]329 assertf( type, "First argument to a derefence must be a pointer. Ensure that expressions are not being shared." );
[906e24d]330 newExpr->set_result( type->clone() );
[51587aa]331 *arg = newExpr;
332 } // if
333 break;
334 }
[71f4e4f]335
[51587aa]336 default:
337 // do nothing
338 ;
[3778cb2]339 } // switch
[71f4e4f]340
[51587aa]341 switch ( opInfo.type ) {
342 case OT_INDEX:
343 assert( applicationExpr->get_args().size() == 2 );
344 (*arg++)->accept( *this );
[6c4ff37]345 output << "[";
[51587aa]346 (*arg)->accept( *this );
[6c4ff37]347 output << "]";
[51587aa]348 break;
[71f4e4f]349
[51587aa]350 case OT_CALL:
[356189a]351 // there are no intrinsic definitions of the function call operator
[51587aa]352 assert( false );
353 break;
[71f4e4f]354
[f1e012b]355 case OT_CTOR:
[c2ce2350]356 case OT_DTOR:
[356189a]357 if ( applicationExpr->get_args().size() == 1 ) {
[8e9cbb2]358 // the expression fed into a single parameter constructor or destructor may contain side
359 // effects, so must still output this expression
[64071c2]360 output << "(";
[356189a]361 (*arg++)->accept( *this );
[64071c2]362 output << ") /* " << opInfo.inputName << " */";
[356189a]363 } else if ( applicationExpr->get_args().size() == 2 ) {
[c2ce2350]364 // intrinsic two parameter constructors are essentially bitwise assignment
[356189a]365 output << "(";
366 (*arg++)->accept( *this );
367 output << opInfo.symbol;
368 (*arg)->accept( *this );
[c2ce2350]369 output << ") /* " << opInfo.inputName << " */";
[356189a]370 } else {
[c2ce2350]371 // no constructors with 0 or more than 2 parameters
[356189a]372 assert( false );
[8688ce1]373 } // if
[356189a]374 break;
[f1e012b]375
[51587aa]376 case OT_PREFIX:
377 case OT_PREFIXASSIGN:
378 assert( applicationExpr->get_args().size() == 1 );
[6c4ff37]379 output << "(";
380 output << opInfo.symbol;
[51587aa]381 (*arg)->accept( *this );
[6c4ff37]382 output << ")";
[51587aa]383 break;
[71f4e4f]384
[51587aa]385 case OT_POSTFIX:
386 case OT_POSTFIXASSIGN:
387 assert( applicationExpr->get_args().size() == 1 );
388 (*arg)->accept( *this );
[6c4ff37]389 output << opInfo.symbol;
[51587aa]390 break;
391
[f1e012b]392
[51587aa]393 case OT_INFIX:
394 case OT_INFIXASSIGN:
395 assert( applicationExpr->get_args().size() == 2 );
[6c4ff37]396 output << "(";
[51587aa]397 (*arg++)->accept( *this );
[6c4ff37]398 output << opInfo.symbol;
[51587aa]399 (*arg)->accept( *this );
[6c4ff37]400 output << ")";
[51587aa]401 break;
[71f4e4f]402
[51587aa]403 case OT_CONSTANT:
[721f17a]404 case OT_LABELADDRESS:
405 // there are no intrinsic definitions of 0/1 or label addresses as functions
[51587aa]406 assert( false );
[3778cb2]407 } // switch
[17cd4eb]408 } else {
[51587aa]409 varExpr->accept( *this );
[6c4ff37]410 output << "(";
[51587aa]411 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]412 output << ")";
[17cd4eb]413 } // if
[51587aa]414 } else {
415 applicationExpr->get_function()->accept( *this );
[6c4ff37]416 output << "(";
[51587aa]417 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]418 output << ")";
[51587aa]419 } // if
420 }
[71f4e4f]421
[8688ce1]422 void CodeGenerator::visit( UntypedExpr * untypedExpr ) {
[e04ef3a]423 extension( untypedExpr );
[8688ce1]424 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
[51587aa]425 OperatorInfo opInfo;
426 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
427 std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
428 switch ( opInfo.type ) {
429 case OT_INDEX:
430 assert( untypedExpr->get_args().size() == 2 );
431 (*arg++)->accept( *this );
[6c4ff37]432 output << "[";
[51587aa]433 (*arg)->accept( *this );
[6c4ff37]434 output << "]";
[51587aa]435 break;
[71f4e4f]436
[51587aa]437 case OT_CALL:
[f1e012b]438 assert( false );
439
[c2ce2350]440 case OT_CTOR:
441 case OT_DTOR:
442 if ( untypedExpr->get_args().size() == 1 ) {
[8e9cbb2]443 // the expression fed into a single parameter constructor or destructor may contain side
444 // effects, so must still output this expression
[64071c2]445 output << "(";
[c2ce2350]446 (*arg++)->accept( *this );
[64071c2]447 output << ") /* " << opInfo.inputName << " */";
[c2ce2350]448 } else if ( untypedExpr->get_args().size() == 2 ) {
449 // intrinsic two parameter constructors are essentially bitwise assignment
450 output << "(";
451 (*arg++)->accept( *this );
452 output << opInfo.symbol;
453 (*arg)->accept( *this );
454 output << ") /* " << opInfo.inputName << " */";
455 } else {
456 // no constructors with 0 or more than 2 parameters
457 assert( false );
[3778cb2]458 } // if
[51587aa]459 break;
[71f4e4f]460
[51587aa]461 case OT_PREFIX:
462 case OT_PREFIXASSIGN:
[de62360d]463 case OT_LABELADDRESS:
[51587aa]464 assert( untypedExpr->get_args().size() == 1 );
[6c4ff37]465 output << "(";
466 output << opInfo.symbol;
[51587aa]467 (*arg)->accept( *this );
[6c4ff37]468 output << ")";
[51587aa]469 break;
[71f4e4f]470
[51587aa]471 case OT_POSTFIX:
472 case OT_POSTFIXASSIGN:
473 assert( untypedExpr->get_args().size() == 1 );
474 (*arg)->accept( *this );
[6c4ff37]475 output << opInfo.symbol;
[51587aa]476 break;
[71f4e4f]477
[51587aa]478 case OT_INFIX:
479 case OT_INFIXASSIGN:
480 assert( untypedExpr->get_args().size() == 2 );
[6c4ff37]481 output << "(";
[51587aa]482 (*arg++)->accept( *this );
[6c4ff37]483 output << opInfo.symbol;
[51587aa]484 (*arg)->accept( *this );
[6c4ff37]485 output << ")";
[51587aa]486 break;
[71f4e4f]487
[51587aa]488 case OT_CONSTANT:
489 // there are no intrinsic definitions of 0 or 1 as functions
490 assert( false );
[3778cb2]491 } // switch
[51587aa]492 } else {
[8688ce1]493 if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
[ac911f4]494 assert( untypedExpr->get_args().size() == 2 );
495 (*untypedExpr->get_args().begin())->accept( *this );
496 output << " ... ";
497 (*--untypedExpr->get_args().end())->accept( *this );
[057b34f]498 } else { // builtin routines
499 nameExpr->accept( *this );
500 output << "(";
501 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
502 output << ")";
[66d12f7]503 } // if
[51587aa]504 } // if
505 } else {
506 untypedExpr->get_function()->accept( *this );
[6c4ff37]507 output << "(";
[51587aa]508 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
[6c4ff37]509 output << ")";
[51587aa]510 } // if
511 }
[71f4e4f]512
[064e3ff]513 void CodeGenerator::visit( RangeExpr * rangeExpr ) {
514 rangeExpr->get_low()->accept( *this );
515 output << " ... ";
516 rangeExpr->get_high()->accept( *this );
517 }
518
[8688ce1]519 void CodeGenerator::visit( NameExpr * nameExpr ) {
[e04ef3a]520 extension( nameExpr );
[51587aa]521 OperatorInfo opInfo;
522 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
523 assert( opInfo.type == OT_CONSTANT );
[6c4ff37]524 output << opInfo.symbol;
[51587aa]525 } else {
[6c4ff37]526 output << nameExpr->get_name();
[51587aa]527 } // if
528 }
[71f4e4f]529
[8688ce1]530 void CodeGenerator::visit( AddressExpr * addressExpr ) {
[e04ef3a]531 extension( addressExpr );
[6c4ff37]532 output << "(&";
[51587aa]533 // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
[8688ce1]534 if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
[6c4ff37]535 output << mangleName( variableExpr->get_var() );
[51587aa]536 } else {
537 addressExpr->get_arg()->accept( *this );
538 } // if
[6c4ff37]539 output << ")";
[51587aa]540 }
541
[8688ce1]542 void CodeGenerator::visit( CastExpr * castExpr ) {
[e04ef3a]543 extension( castExpr );
[803deb1]544 output << "(";
[906e24d]545 if ( castExpr->get_result()->isVoid() ) {
[803deb1]546 output << "(void)" ;
[906e24d]547 } else if ( ! castExpr->get_result()->get_isLvalue() ) {
[803deb1]548 // at least one result type of cast, but not an lvalue
549 output << "(";
[906e24d]550 output << genType( castExpr->get_result(), "" );
[71f4e4f]551 output << ")";
[803deb1]552 } else {
[8e9cbb2]553 // otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
[803deb1]554 // never an lvalue in C
[3778cb2]555 } // if
[803deb1]556 castExpr->get_arg()->accept( *this );
557 output << ")";
[51587aa]558 }
[71f4e4f]559
[8688ce1]560 void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) {
[51587aa]561 assert( false );
562 }
[71f4e4f]563
[8688ce1]564 void CodeGenerator::visit( MemberExpr * memberExpr ) {
[e04ef3a]565 extension( memberExpr );
[51587aa]566 memberExpr->get_aggregate()->accept( *this );
[6c4ff37]567 output << "." << mangleName( memberExpr->get_member() );
[51587aa]568 }
[71f4e4f]569
[8688ce1]570 void CodeGenerator::visit( VariableExpr * variableExpr ) {
[e04ef3a]571 extension( variableExpr );
[51587aa]572 OperatorInfo opInfo;
573 if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
[6c4ff37]574 output << opInfo.symbol;
[51587aa]575 } else {
[6c4ff37]576 output << mangleName( variableExpr->get_var() );
[51587aa]577 } // if
578 }
[71f4e4f]579
[8688ce1]580 void CodeGenerator::visit( ConstantExpr * constantExpr ) {
[51587aa]581 assert( constantExpr->get_constant() );
[e04ef3a]582 extension( constantExpr );
[51587aa]583 constantExpr->get_constant()->accept( *this );
584 }
[71f4e4f]585
[8688ce1]586 void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
[e04ef3a]587 extension( sizeofExpr );
[6c4ff37]588 output << "sizeof(";
[51587aa]589 if ( sizeofExpr->get_isType() ) {
[6c4ff37]590 output << genType( sizeofExpr->get_type(), "" );
[51587aa]591 } else {
592 sizeofExpr->get_expr()->accept( *this );
593 } // if
[6c4ff37]594 output << ")";
[51587aa]595 }
[47534159]596
[8688ce1]597 void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
[47534159]598 // use GCC extension to avoid bumping std to C11
[8e9cbb2]599 extension( alignofExpr );
[47534159]600 output << "__alignof__(";
[25a054f]601 if ( alignofExpr->get_isType() ) {
602 output << genType( alignofExpr->get_type(), "" );
[47534159]603 } else {
[25a054f]604 alignofExpr->get_expr()->accept( *this );
[47534159]605 } // if
606 output << ")";
607 }
[71f4e4f]608
[8688ce1]609 void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
[8e9cbb2]610 assert( false && "UntypedOffsetofExpr should not reach code generation." );
[2a4b088]611 }
612
[8688ce1]613 void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
[25a054f]614 // use GCC builtin
615 output << "__builtin_offsetof(";
616 output << genType( offsetofExpr->get_type(), "" );
[e551c69]617 output << ", " << mangleName( offsetofExpr->get_member() );
[25a054f]618 output << ")";
619 }
[d63eeb0]620
[8688ce1]621 void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
[8e9cbb2]622 assert( false && "OffsetPackExpr should not reach code generation." );
[afc1045]623 }
[70a06f6]624
[8688ce1]625 void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
[e04ef3a]626 extension( logicalExpr );
[6c4ff37]627 output << "(";
[51587aa]628 logicalExpr->get_arg1()->accept( *this );
629 if ( logicalExpr->get_isAnd() ) {
[6c4ff37]630 output << " && ";
[51587aa]631 } else {
[6c4ff37]632 output << " || ";
[51587aa]633 } // if
634 logicalExpr->get_arg2()->accept( *this );
[6c4ff37]635 output << ")";
[51587aa]636 }
[71f4e4f]637
[8688ce1]638 void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
[e04ef3a]639 extension( conditionalExpr );
[6c4ff37]640 output << "(";
[51587aa]641 conditionalExpr->get_arg1()->accept( *this );
[6c4ff37]642 output << " ? ";
[51587aa]643 conditionalExpr->get_arg2()->accept( *this );
[6c4ff37]644 output << " : ";
[51587aa]645 conditionalExpr->get_arg3()->accept( *this );
[6c4ff37]646 output << ")";
[51587aa]647 }
[71f4e4f]648
[8688ce1]649 void CodeGenerator::visit( CommaExpr * commaExpr ) {
[e04ef3a]650 extension( commaExpr );
[6c4ff37]651 output << "(";
[51587aa]652 commaExpr->get_arg1()->accept( *this );
[6c4ff37]653 output << " , ";
[51587aa]654 commaExpr->get_arg2()->accept( *this );
[6c4ff37]655 output << ")";
[51587aa]656 }
[71f4e4f]657
[907eccb]658 void CodeGenerator::visit( UntypedTupleExpr * tupleExpr ) { assertf( false, "UntypedTupleExpr should not make it to Code Gen" ); }
659
660 void CodeGenerator::visit( TupleExpr * tupleExpr ) { assertf( false, "TupleExpr should not make it to Code Gen" ); }
[71f4e4f]661
[8688ce1]662 void CodeGenerator::visit( TypeExpr * typeExpr ) {}
[2b6c1e0]663
[8688ce1]664 void CodeGenerator::visit( AsmExpr * asmExpr ) {
[7f5566b]665 if ( asmExpr->get_inout() ) {
666 output << "[ ";
667 asmExpr->get_inout()->accept( *this );
668 output << " ] ";
669 } // if
670 asmExpr->get_constraint()->accept( *this );
671 output << " ( ";
672 asmExpr->get_operand()->accept( *this );
673 output << " )";
674 }
675
[3c13c03]676 void CodeGenerator::visit( CompoundLiteralExpr *compLitExpr ) {
677 assert( compLitExpr->get_type() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
678 output << "(" << genType( compLitExpr->get_type(), "" ) << ")";
679 compLitExpr->get_initializer()->accept( *this );
680 }
681
[6eb8948]682 void CodeGenerator::visit( StmtExpr * stmtExpr ) {
[3c13c03]683 std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
684 output << "({" << std::endl;
685 cur_indent += CodeGenerator::tabsize;
686 unsigned int numStmts = stmts.size();
687 unsigned int i = 0;
688 for ( Statement * stmt : stmts ) {
689 output << indent << printLabels( stmt->get_labels() );
690 if ( i+1 == numStmts ) {
691 // last statement in a statement expression needs to be handled specially -
692 // cannot cast to void, otherwise the expression statement has no value
693 if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
694 exprStmt->get_expr()->accept( *this );
695 output << ";" << endl;
696 ++i;
697 break;
698 }
699 }
700 stmt->accept( *this );
701 output << endl;
702 if ( wantSpacing( stmt ) ) {
703 output << endl;
704 } // if
705 ++i;
706 }
707 cur_indent -= CodeGenerator::tabsize;
708 output << indent << "})";
[6eb8948]709 }
710
[51587aa]711 //*** Statements
[8688ce1]712 void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
[51587aa]713 std::list<Statement*> ks = compoundStmt->get_kids();
[2b6c1e0]714 output << "{" << endl;
[51587aa]715
[2b6c1e0]716 cur_indent += CodeGenerator::tabsize;
[51587aa]717
[7f5566b]718 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
[cda48b6]719 output << indent << printLabels( (*i)->get_labels() );
[7f5566b]720 (*i)->accept( *this );
[2b6c1e0]721
[6c4ff37]722 output << endl;
[2b6c1e0]723 if ( wantSpacing( *i ) ) {
724 output << endl;
[3778cb2]725 } // if
[8688ce1]726 } // for
[71f4e4f]727 cur_indent -= CodeGenerator::tabsize;
[51587aa]728
[cda48b6]729 output << indent << "}";
[51587aa]730 }
731
[8688ce1]732 void CodeGenerator::visit( ExprStmt * exprStmt ) {
[6c4ff37]733 assert( exprStmt );
[321a2481]734 // cast the top-level expression to void to reduce gcc warnings.
735 Expression * expr = new CastExpr( exprStmt->get_expr() );
736 expr->accept( *this );
737 output << ";";
[51587aa]738 }
739
[8688ce1]740 void CodeGenerator::visit( AsmStmt * asmStmt ) {
[7f5566b]741 output << "asm ";
742 if ( asmStmt->get_voltile() ) output << "volatile ";
743 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
744 output << "( ";
745 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
746 output << " : ";
747 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
748 output << " : ";
749 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
750 output << " : ";
751 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
752 if ( ! asmStmt->get_gotolabels().empty() ) {
753 output << " : ";
754 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
755 output << *begin++;
756 if ( begin == asmStmt->get_gotolabels().end() ) break;
757 output << ", ";
758 } // for
759 } // if
760 output << " );" ;
761 }
762
[8688ce1]763 void CodeGenerator::visit( IfStmt * ifStmt ) {
[7f5566b]764 output << "if ( ";
765 ifStmt->get_condition()->accept( *this );
766 output << " ) ";
[51587aa]767
[7f5566b]768 ifStmt->get_thenPart()->accept( *this );
[51587aa]769
770 if ( ifStmt->get_elsePart() != 0) {
[2b6c1e0]771 output << " else ";
[7f5566b]772 ifStmt->get_elsePart()->accept( *this );
[51587aa]773 } // if
774 }
775
[8688ce1]776 void CodeGenerator::visit( SwitchStmt * switchStmt ) {
[7f5566b]777 output << "switch ( " ;
778 switchStmt->get_condition()->accept( *this );
779 output << " ) ";
[71f4e4f]780
[2b6c1e0]781 output << "{" << std::endl;
[6c4ff37]782 cur_indent += CodeGenerator::tabsize;
[8688ce1]783 acceptAll( switchStmt->get_statements(), *this );
[6c4ff37]784 cur_indent -= CodeGenerator::tabsize;
[cda48b6]785 output << indent << "}";
[51587aa]786 }
787
[8688ce1]788 void CodeGenerator::visit( CaseStmt * caseStmt ) {
[cda48b6]789 output << indent;
[eb3261f]790 if ( caseStmt->isDefault()) {
[2b6c1e0]791 output << "default";
[eb3261f]792 } else {
[2b6c1e0]793 output << "case ";
[7f5566b]794 caseStmt->get_condition()->accept( *this );
[17cd4eb]795 } // if
[6c4ff37]796 output << ":\n";
[71f4e4f]797
[51587aa]798 std::list<Statement *> sts = caseStmt->get_statements();
799
[6c4ff37]800 cur_indent += CodeGenerator::tabsize;
[51587aa]801 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
[cda48b6]802 output << indent << printLabels( (*i)->get_labels() ) ;
[7f5566b]803 (*i)->accept( *this );
[6c4ff37]804 output << endl;
[3778cb2]805 } // for
[6c4ff37]806 cur_indent -= CodeGenerator::tabsize;
[51587aa]807 }
808
[8688ce1]809 void CodeGenerator::visit( BranchStmt * branchStmt ) {
[51587aa]810 switch ( branchStmt->get_type()) {
811 case BranchStmt::Goto:
812 if ( ! branchStmt->get_target().empty() )
[6c4ff37]813 output << "goto " << branchStmt->get_target();
[71f4e4f]814 else {
[51587aa]815 if ( branchStmt->get_computedTarget() != 0 ) {
[6c4ff37]816 output << "goto *";
[51587aa]817 branchStmt->get_computedTarget()->accept( *this );
818 } // if
819 } // if
820 break;
821 case BranchStmt::Break:
[6c4ff37]822 output << "break";
[51587aa]823 break;
824 case BranchStmt::Continue:
[6c4ff37]825 output << "continue";
[51587aa]826 break;
[3778cb2]827 } // switch
[2b6c1e0]828 output << ";";
[51587aa]829 }
830
831
[8688ce1]832 void CodeGenerator::visit( ReturnStmt * returnStmt ) {
[6c4ff37]833 output << "return ";
[4b2589a]834 maybeAccept( returnStmt->get_expr(), *this );
[6c4ff37]835 output << ";";
[51587aa]836 }
837
[8688ce1]838 void CodeGenerator::visit( WhileStmt * whileStmt ) {
[321a2481]839 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]840 output << "do" ;
[321a2481]841 } else {
[6c4ff37]842 output << "while (" ;
[7f5566b]843 whileStmt->get_condition()->accept( *this );
[6c4ff37]844 output << ")";
[51587aa]845 } // if
[2b6c1e0]846 output << " ";
[51587aa]847
[2b6c1e0]848 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
[51587aa]849 whileStmt->get_body()->accept( *this );
850
[cda48b6]851 output << indent;
[51587aa]852
853 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]854 output << " while (" ;
[7f5566b]855 whileStmt->get_condition()->accept( *this );
[6c4ff37]856 output << ");";
[51587aa]857 } // if
858 }
859
[8688ce1]860 void CodeGenerator::visit( ForStmt * forStmt ) {
[8e9cbb2]861 // initialization is always hoisted, so don't bother doing anything with that
[145f1fc]862 output << "for (;";
[51587aa]863
[321a2481]864 if ( forStmt->get_condition() != 0 ) {
[51587aa]865 forStmt->get_condition()->accept( *this );
[3778cb2]866 } // if
[6c4ff37]867 output << ";";
[51587aa]868
[321a2481]869 if ( forStmt->get_increment() != 0 ) {
870 // cast the top-level expression to void to reduce gcc warnings.
871 Expression * expr = new CastExpr( forStmt->get_increment() );
872 expr->accept( *this );
[3778cb2]873 } // if
[2b6c1e0]874 output << ") ";
[51587aa]875
876 if ( forStmt->get_body() != 0 ) {
[2b6c1e0]877 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
[51587aa]878 forStmt->get_body()->accept( *this );
879 } // if
880 }
881
[8688ce1]882 void CodeGenerator::visit( NullStmt * nullStmt ) {
[cda48b6]883 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
[6c4ff37]884 output << "/* null statement */ ;";
[51587aa]885 }
886
[8688ce1]887 void CodeGenerator::visit( DeclStmt * declStmt ) {
[51587aa]888 declStmt->get_decl()->accept( *this );
[71f4e4f]889
[51587aa]890 if ( doSemicolon( declStmt->get_decl() ) ) {
[6c4ff37]891 output << ";";
[51587aa]892 } // if
893 }
894
[8688ce1]895 void CodeGenerator::handleStorageClass( Declaration * decl ) {
[51587aa]896 switch ( decl->get_storageClass() ) {
[68cd1ce]897 case DeclarationNode::Extern:
[6c4ff37]898 output << "extern ";
[51587aa]899 break;
[68cd1ce]900 case DeclarationNode::Static:
[6c4ff37]901 output << "static ";
[51587aa]902 break;
[68cd1ce]903 case DeclarationNode::Auto:
[51587aa]904 // silently drop storage class
905 break;
[68cd1ce]906 case DeclarationNode::Register:
[6c4ff37]907 output << "register ";
[51587aa]908 break;
[68cd1ce]909 case DeclarationNode::Inline:
[de62360d]910 output << "inline ";
[f38c8d9]911 break;
[68cd1ce]912 case DeclarationNode::Fortran:
913 output << "fortran ";
914 break;
915 case DeclarationNode::Noreturn:
916 output << "_Noreturn ";
917 break;
918 case DeclarationNode::Threadlocal:
919 output << "_Thread_local ";
920 break;
921 case DeclarationNode::NoStorageClass:
[f38c8d9]922 break;
[843054c2]923 } // switch
[51587aa]924 }
[9facf3b]925
926 std::string genName( DeclarationWithType * decl ) {
927 CodeGen::OperatorInfo opInfo;
928 if ( operatorLookup( decl->get_name(), opInfo ) ) {
929 return opInfo.outputName;
930 } else {
931 return decl->get_name();
932 } // if
933 }
[51b73452]934} // namespace CodeGen
[51587aa]935
936// Local Variables: //
937// tab-width: 4 //
938// mode: c++ //
939// compile-command: "make install" //
940// End: //
Note: See TracBrowser for help on using the repository browser.