source: src/CodeGen/CodeGenerator.cc@ 511aa69a

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 511aa69a was 44a81853, checked in by Peter A. Buhr <pabuhr@…>, 9 years ago

first attempt at gcc attributes
  • Property mode set to 100644
File size: 27.8 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
[44a81853]12// Last Modified On : Wed Jan 18 15:23:08 2017
13// Update Count : 414
[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
[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 );
[f38c8d9]136 if ( functionDecl->get_isInline() ) {
[6c4ff37]137 output << "inline ";
[f38c8d9]138 } // if
[de62360d]139 if ( functionDecl->get_isNoreturn() ) {
140 output << "_Noreturn ";
141 } // if
[6c4ff37]142 output << genType( functionDecl->get_functionType(), mangleName( functionDecl ) );
[51587aa]143
144 // how to get this to the Functype?
145 std::list< Declaration * > olds = functionDecl->get_oldDecls();
146 if ( ! olds.empty() ) {
[6c4ff37]147 output << " /* function has old declaration */";
[51587aa]148 } // if
149
[58dd019]150 asmName( functionDecl );
151
[51587aa]152 // acceptAll( functionDecl->get_oldDecls(), *this );
153 if ( functionDecl->get_statements() ) {
[7f5566b]154 functionDecl->get_statements()->accept( *this );
[51587aa]155 } // if
156 }
157
[8688ce1]158 void CodeGenerator::visit( ObjectDecl * objectDecl ) {
[8e9cbb2]159 extension( objectDecl );
[f9cebb5]160 genAttributes( objectDecl->get_attributes() );
161
[51587aa]162 handleStorageClass( objectDecl );
[6c4ff37]163 output << genType( objectDecl->get_type(), mangleName( objectDecl ) );
[71f4e4f]164
[58dd019]165 asmName( objectDecl );
166
[51587aa]167 if ( objectDecl->get_init() ) {
[6c4ff37]168 output << " = ";
[51587aa]169 objectDecl->get_init()->accept( *this );
170 } // if
[3778cb2]171
[51587aa]172 if ( objectDecl->get_bitfieldWidth() ) {
[6c4ff37]173 output << ":";
[51587aa]174 objectDecl->get_bitfieldWidth()->accept( *this );
175 } // if
176 }
177
[8688ce1]178 void CodeGenerator::handleAggregate( AggregateDecl * aggDecl ) {
[51587aa]179 if ( aggDecl->get_name() != "" )
[6c4ff37]180 output << aggDecl->get_name();
[71f4e4f]181
[2c57025]182 // std::list< Declaration * > & memb = aggDecl->get_members();
183 // if ( ! memb.empty() ) {
184 if ( aggDecl->has_body() ) {
185 std::list< Declaration * > & memb = aggDecl->get_members();
[94b4364]186 output << " {" << endl;
[51587aa]187
[71f4e4f]188 cur_indent += CodeGenerator::tabsize;
[3778cb2]189 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
[71f4e4f]190 output << indent;
[7f5566b]191 (*i)->accept( *this );
[6c4ff37]192 output << ";" << endl;
[3778cb2]193 } // for
[51587aa]194
[71f4e4f]195 cur_indent -= CodeGenerator::tabsize;
[51587aa]196
[cda48b6]197 output << indent << "}";
[17cd4eb]198 } // if
[51587aa]199 }
[17cd4eb]200
[8688ce1]201 void CodeGenerator::visit( StructDecl * structDecl ) {
[8e9cbb2]202 extension( structDecl );
[6c4ff37]203 output << "struct ";
[51587aa]204 handleAggregate( structDecl );
205 }
[17cd4eb]206
[8688ce1]207 void CodeGenerator::visit( UnionDecl * unionDecl ) {
[8e9cbb2]208 extension( unionDecl );
[6c4ff37]209 output << "union ";
[8e9cbb2]210 handleAggregate( unionDecl );
[51587aa]211 }
[71f4e4f]212
[8688ce1]213 void CodeGenerator::visit( EnumDecl * enumDecl ) {
[8e9cbb2]214 extension( enumDecl );
[6c4ff37]215 output << "enum ";
[51587aa]216
[8e9cbb2]217 if ( enumDecl->get_name() != "" )
218 output << enumDecl->get_name();
[71f4e4f]219
[8e9cbb2]220 std::list< Declaration* > &memb = enumDecl->get_members();
[51587aa]221
222 if ( ! memb.empty() ) {
[cda48b6]223 output << " {" << endl;
[51587aa]224
[71f4e4f]225 cur_indent += CodeGenerator::tabsize;
[51587aa]226 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
[8688ce1]227 ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
[51587aa]228 assert( obj );
[71f4e4f]229 output << indent << mangleName( obj );
[51587aa]230 if ( obj->get_init() ) {
[6c4ff37]231 output << " = ";
[7f5566b]232 obj->get_init()->accept( *this );
[51587aa]233 } // if
[6c4ff37]234 output << "," << endl;
[51587aa]235 } // for
236
[71f4e4f]237 cur_indent -= CodeGenerator::tabsize;
[51587aa]238
[cda48b6]239 output << indent << "}";
[51587aa]240 } // if
241 }
[71f4e4f]242
[8688ce1]243 void CodeGenerator::visit( TraitDecl * traitDecl ) {}
[71f4e4f]244
[8688ce1]245 void CodeGenerator::visit( TypedefDecl * typeDecl ) {
[8e9cbb2]246 assert( false && "Typedefs are removed and substituted in earlier passes." );
247 //output << "typedef ";
248 //output << genType( typeDecl->get_base(), typeDecl->get_name() );
[51587aa]249 }
[71f4e4f]250
[8688ce1]251 void CodeGenerator::visit( TypeDecl * typeDecl ) {
[51587aa]252 // really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
253 // still to be done
[8e9cbb2]254 extension( typeDecl );
[6c4ff37]255 output << "extern unsigned long " << typeDecl->get_name();
[51587aa]256 if ( typeDecl->get_base() ) {
[6c4ff37]257 output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )";
[51587aa]258 } // if
259 }
260
[e45215c]261 void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
262 typedef std::list< Expression * > DesignatorList;
263 if ( designators.size() == 0 ) return;
264 for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
[8a4da06]265 if ( dynamic_cast< NameExpr * >( *iter ) ) {
[f32c7f4]266 // if expression is a name, then initializing aggregate member
267 output << ".";
268 (*iter)->accept( *this );
269 } else {
270 // if not a simple name, it has to be a constant expression, i.e. an array designator
[e45215c]271 output << "[";
272 (*iter)->accept( *this );
273 output << "]";
[3778cb2]274 } // if
275 } // for
[e45215c]276 output << " = ";
277 }
278
[8688ce1]279 void CodeGenerator::visit( SingleInit * init ) {
[e45215c]280 printDesignators( init->get_designators() );
[51587aa]281 init->get_value()->accept( *this );
282 }
283
[8688ce1]284 void CodeGenerator::visit( ListInit * init ) {
[e45215c]285 printDesignators( init->get_designators() );
[6c4ff37]286 output << "{ ";
[4d2434a]287 if ( init->begin() == init->end() ) {
[8e9cbb2]288 // illegal to leave initializer list empty for scalar initializers, but always legal to have 0
[5b40f30]289 output << "0";
290 } else {
[4d2434a]291 genCommaList( init->begin(), init->end() );
[8688ce1]292 } // if
[6c4ff37]293 output << " }";
[51587aa]294 }
295
[fc638d2]296 void CodeGenerator::visit( ConstructorInit * init ){
297 assertf( false, "ConstructorInit nodes should not make it to CodeGen." );
298 }
299
[8688ce1]300 void CodeGenerator::visit( Constant * constant ) {
[6c4ff37]301 output << constant->get_value() ;
[51587aa]302 }
303
304 //*** Expressions
[8688ce1]305 void CodeGenerator::visit( ApplicationExpr * applicationExpr ) {
[e04ef3a]306 extension( applicationExpr );
[8688ce1]307 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
[51587aa]308 OperatorInfo opInfo;
309 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
310 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
311 switch ( opInfo.type ) {
312 case OT_PREFIXASSIGN:
313 case OT_POSTFIXASSIGN:
314 case OT_INFIXASSIGN:
[356189a]315 case OT_CTOR:
[c2ce2350]316 case OT_DTOR:
[51587aa]317 {
318 assert( arg != applicationExpr->get_args().end() );
[8688ce1]319 if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) {
[356189a]320 // remove & from first assignment/ctor argument
[51587aa]321 *arg = addrExpr->get_arg();
322 } else {
[356189a]323 // no address-of operator, so must be a pointer - add dereference
[066d77a]324 // NOTE: if the assertion starts to trigger, check that the application expr isn't being shared.
325 // Since its arguments are modified here, this assertion most commonly triggers when the application
326 // is visited multiple times.
[8688ce1]327 UntypedExpr * newExpr = new UntypedExpr( new NameExpr( "*?" ) );
[51587aa]328 newExpr->get_args().push_back( *arg );
[906e24d]329 Type * type = InitTweak::getPointerBase( (*arg)->get_result() );
[066d77a]330 assertf( type, "First argument to a derefence must be a pointer. Ensure that expressions are not being shared." );
[906e24d]331 newExpr->set_result( type->clone() );
[51587aa]332 *arg = newExpr;
333 } // if
334 break;
335 }
[71f4e4f]336
[51587aa]337 default:
338 // do nothing
339 ;
[3778cb2]340 } // switch
[71f4e4f]341
[51587aa]342 switch ( opInfo.type ) {
343 case OT_INDEX:
344 assert( applicationExpr->get_args().size() == 2 );
345 (*arg++)->accept( *this );
[6c4ff37]346 output << "[";
[51587aa]347 (*arg)->accept( *this );
[6c4ff37]348 output << "]";
[51587aa]349 break;
[71f4e4f]350
[51587aa]351 case OT_CALL:
[356189a]352 // there are no intrinsic definitions of the function call operator
[51587aa]353 assert( false );
354 break;
[71f4e4f]355
[f1e012b]356 case OT_CTOR:
[c2ce2350]357 case OT_DTOR:
[356189a]358 if ( applicationExpr->get_args().size() == 1 ) {
[8e9cbb2]359 // the expression fed into a single parameter constructor or destructor may contain side
360 // effects, so must still output this expression
[64071c2]361 output << "(";
[356189a]362 (*arg++)->accept( *this );
[64071c2]363 output << ") /* " << opInfo.inputName << " */";
[356189a]364 } else if ( applicationExpr->get_args().size() == 2 ) {
[c2ce2350]365 // intrinsic two parameter constructors are essentially bitwise assignment
[356189a]366 output << "(";
367 (*arg++)->accept( *this );
368 output << opInfo.symbol;
369 (*arg)->accept( *this );
[c2ce2350]370 output << ") /* " << opInfo.inputName << " */";
[356189a]371 } else {
[c2ce2350]372 // no constructors with 0 or more than 2 parameters
[356189a]373 assert( false );
[8688ce1]374 } // if
[356189a]375 break;
[f1e012b]376
[51587aa]377 case OT_PREFIX:
378 case OT_PREFIXASSIGN:
379 assert( applicationExpr->get_args().size() == 1 );
[6c4ff37]380 output << "(";
381 output << opInfo.symbol;
[51587aa]382 (*arg)->accept( *this );
[6c4ff37]383 output << ")";
[51587aa]384 break;
[71f4e4f]385
[51587aa]386 case OT_POSTFIX:
387 case OT_POSTFIXASSIGN:
388 assert( applicationExpr->get_args().size() == 1 );
389 (*arg)->accept( *this );
[6c4ff37]390 output << opInfo.symbol;
[51587aa]391 break;
392
[f1e012b]393
[51587aa]394 case OT_INFIX:
395 case OT_INFIXASSIGN:
396 assert( applicationExpr->get_args().size() == 2 );
[6c4ff37]397 output << "(";
[51587aa]398 (*arg++)->accept( *this );
[6c4ff37]399 output << opInfo.symbol;
[51587aa]400 (*arg)->accept( *this );
[6c4ff37]401 output << ")";
[51587aa]402 break;
[71f4e4f]403
[51587aa]404 case OT_CONSTANT:
[721f17a]405 case OT_LABELADDRESS:
406 // there are no intrinsic definitions of 0/1 or label addresses as functions
[51587aa]407 assert( false );
[3778cb2]408 } // switch
[17cd4eb]409 } else {
[51587aa]410 varExpr->accept( *this );
[6c4ff37]411 output << "(";
[51587aa]412 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]413 output << ")";
[17cd4eb]414 } // if
[51587aa]415 } else {
416 applicationExpr->get_function()->accept( *this );
[6c4ff37]417 output << "(";
[51587aa]418 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]419 output << ")";
[51587aa]420 } // if
421 }
[71f4e4f]422
[8688ce1]423 void CodeGenerator::visit( UntypedExpr * untypedExpr ) {
[e04ef3a]424 extension( untypedExpr );
[8688ce1]425 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
[51587aa]426 OperatorInfo opInfo;
427 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
428 std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
429 switch ( opInfo.type ) {
430 case OT_INDEX:
431 assert( untypedExpr->get_args().size() == 2 );
432 (*arg++)->accept( *this );
[6c4ff37]433 output << "[";
[51587aa]434 (*arg)->accept( *this );
[6c4ff37]435 output << "]";
[51587aa]436 break;
[71f4e4f]437
[51587aa]438 case OT_CALL:
[f1e012b]439 assert( false );
440
[c2ce2350]441 case OT_CTOR:
442 case OT_DTOR:
443 if ( untypedExpr->get_args().size() == 1 ) {
[8e9cbb2]444 // the expression fed into a single parameter constructor or destructor may contain side
445 // effects, so must still output this expression
[64071c2]446 output << "(";
[c2ce2350]447 (*arg++)->accept( *this );
[64071c2]448 output << ") /* " << opInfo.inputName << " */";
[c2ce2350]449 } else if ( untypedExpr->get_args().size() == 2 ) {
450 // intrinsic two parameter constructors are essentially bitwise assignment
451 output << "(";
452 (*arg++)->accept( *this );
453 output << opInfo.symbol;
454 (*arg)->accept( *this );
455 output << ") /* " << opInfo.inputName << " */";
456 } else {
457 // no constructors with 0 or more than 2 parameters
458 assert( false );
[3778cb2]459 } // if
[51587aa]460 break;
[71f4e4f]461
[51587aa]462 case OT_PREFIX:
463 case OT_PREFIXASSIGN:
[de62360d]464 case OT_LABELADDRESS:
[51587aa]465 assert( untypedExpr->get_args().size() == 1 );
[6c4ff37]466 output << "(";
467 output << opInfo.symbol;
[51587aa]468 (*arg)->accept( *this );
[6c4ff37]469 output << ")";
[51587aa]470 break;
[71f4e4f]471
[51587aa]472 case OT_POSTFIX:
473 case OT_POSTFIXASSIGN:
474 assert( untypedExpr->get_args().size() == 1 );
475 (*arg)->accept( *this );
[6c4ff37]476 output << opInfo.symbol;
[51587aa]477 break;
[71f4e4f]478
[51587aa]479 case OT_INFIX:
480 case OT_INFIXASSIGN:
481 assert( untypedExpr->get_args().size() == 2 );
[6c4ff37]482 output << "(";
[51587aa]483 (*arg++)->accept( *this );
[6c4ff37]484 output << opInfo.symbol;
[51587aa]485 (*arg)->accept( *this );
[6c4ff37]486 output << ")";
[51587aa]487 break;
[71f4e4f]488
[51587aa]489 case OT_CONSTANT:
490 // there are no intrinsic definitions of 0 or 1 as functions
491 assert( false );
[3778cb2]492 } // switch
[51587aa]493 } else {
[8688ce1]494 if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
[ac911f4]495 assert( untypedExpr->get_args().size() == 2 );
496 (*untypedExpr->get_args().begin())->accept( *this );
497 output << " ... ";
498 (*--untypedExpr->get_args().end())->accept( *this );
[057b34f]499 } else { // builtin routines
500 nameExpr->accept( *this );
501 output << "(";
502 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
503 output << ")";
[66d12f7]504 } // if
[51587aa]505 } // if
506 } else {
507 untypedExpr->get_function()->accept( *this );
[6c4ff37]508 output << "(";
[51587aa]509 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
[6c4ff37]510 output << ")";
[51587aa]511 } // if
512 }
[71f4e4f]513
[064e3ff]514 void CodeGenerator::visit( RangeExpr * rangeExpr ) {
515 rangeExpr->get_low()->accept( *this );
516 output << " ... ";
517 rangeExpr->get_high()->accept( *this );
518 }
519
[8688ce1]520 void CodeGenerator::visit( NameExpr * nameExpr ) {
[e04ef3a]521 extension( nameExpr );
[51587aa]522 OperatorInfo opInfo;
523 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
524 assert( opInfo.type == OT_CONSTANT );
[6c4ff37]525 output << opInfo.symbol;
[51587aa]526 } else {
[6c4ff37]527 output << nameExpr->get_name();
[51587aa]528 } // if
529 }
[71f4e4f]530
[8688ce1]531 void CodeGenerator::visit( AddressExpr * addressExpr ) {
[e04ef3a]532 extension( addressExpr );
[6c4ff37]533 output << "(&";
[51587aa]534 // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
[8688ce1]535 if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
[6c4ff37]536 output << mangleName( variableExpr->get_var() );
[51587aa]537 } else {
538 addressExpr->get_arg()->accept( *this );
539 } // if
[6c4ff37]540 output << ")";
[51587aa]541 }
542
[8688ce1]543 void CodeGenerator::visit( CastExpr * castExpr ) {
[e04ef3a]544 extension( castExpr );
[803deb1]545 output << "(";
[906e24d]546 if ( castExpr->get_result()->isVoid() ) {
[803deb1]547 output << "(void)" ;
[906e24d]548 } else if ( ! castExpr->get_result()->get_isLvalue() ) {
[803deb1]549 // at least one result type of cast, but not an lvalue
550 output << "(";
[906e24d]551 output << genType( castExpr->get_result(), "" );
[71f4e4f]552 output << ")";
[803deb1]553 } else {
[8e9cbb2]554 // otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
[803deb1]555 // never an lvalue in C
[3778cb2]556 } // if
[803deb1]557 castExpr->get_arg()->accept( *this );
558 output << ")";
[51587aa]559 }
[71f4e4f]560
[8688ce1]561 void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) {
[51587aa]562 assert( false );
563 }
[71f4e4f]564
[8688ce1]565 void CodeGenerator::visit( MemberExpr * memberExpr ) {
[e04ef3a]566 extension( memberExpr );
[51587aa]567 memberExpr->get_aggregate()->accept( *this );
[6c4ff37]568 output << "." << mangleName( memberExpr->get_member() );
[51587aa]569 }
[71f4e4f]570
[8688ce1]571 void CodeGenerator::visit( VariableExpr * variableExpr ) {
[e04ef3a]572 extension( variableExpr );
[51587aa]573 OperatorInfo opInfo;
574 if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
[6c4ff37]575 output << opInfo.symbol;
[51587aa]576 } else {
[6c4ff37]577 output << mangleName( variableExpr->get_var() );
[51587aa]578 } // if
579 }
[71f4e4f]580
[8688ce1]581 void CodeGenerator::visit( ConstantExpr * constantExpr ) {
[51587aa]582 assert( constantExpr->get_constant() );
[e04ef3a]583 extension( constantExpr );
[51587aa]584 constantExpr->get_constant()->accept( *this );
585 }
[71f4e4f]586
[8688ce1]587 void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
[e04ef3a]588 extension( sizeofExpr );
[6c4ff37]589 output << "sizeof(";
[51587aa]590 if ( sizeofExpr->get_isType() ) {
[6c4ff37]591 output << genType( sizeofExpr->get_type(), "" );
[51587aa]592 } else {
593 sizeofExpr->get_expr()->accept( *this );
594 } // if
[6c4ff37]595 output << ")";
[51587aa]596 }
[47534159]597
[8688ce1]598 void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
[47534159]599 // use GCC extension to avoid bumping std to C11
[8e9cbb2]600 extension( alignofExpr );
[47534159]601 output << "__alignof__(";
[25a054f]602 if ( alignofExpr->get_isType() ) {
603 output << genType( alignofExpr->get_type(), "" );
[47534159]604 } else {
[25a054f]605 alignofExpr->get_expr()->accept( *this );
[47534159]606 } // if
607 output << ")";
608 }
[71f4e4f]609
[8688ce1]610 void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
[8e9cbb2]611 assert( false && "UntypedOffsetofExpr should not reach code generation." );
[2a4b088]612 }
613
[8688ce1]614 void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
[25a054f]615 // use GCC builtin
616 output << "__builtin_offsetof(";
617 output << genType( offsetofExpr->get_type(), "" );
[e551c69]618 output << ", " << mangleName( offsetofExpr->get_member() );
[25a054f]619 output << ")";
620 }
[d63eeb0]621
[8688ce1]622 void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
[8e9cbb2]623 assert( false && "OffsetPackExpr should not reach code generation." );
[afc1045]624 }
[70a06f6]625
[8688ce1]626 void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
[e04ef3a]627 extension( logicalExpr );
[6c4ff37]628 output << "(";
[51587aa]629 logicalExpr->get_arg1()->accept( *this );
630 if ( logicalExpr->get_isAnd() ) {
[6c4ff37]631 output << " && ";
[51587aa]632 } else {
[6c4ff37]633 output << " || ";
[51587aa]634 } // if
635 logicalExpr->get_arg2()->accept( *this );
[6c4ff37]636 output << ")";
[51587aa]637 }
[71f4e4f]638
[8688ce1]639 void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
[e04ef3a]640 extension( conditionalExpr );
[6c4ff37]641 output << "(";
[51587aa]642 conditionalExpr->get_arg1()->accept( *this );
[6c4ff37]643 output << " ? ";
[51587aa]644 conditionalExpr->get_arg2()->accept( *this );
[6c4ff37]645 output << " : ";
[51587aa]646 conditionalExpr->get_arg3()->accept( *this );
[6c4ff37]647 output << ")";
[51587aa]648 }
[71f4e4f]649
[8688ce1]650 void CodeGenerator::visit( CommaExpr * commaExpr ) {
[e04ef3a]651 extension( commaExpr );
[6c4ff37]652 output << "(";
[51587aa]653 commaExpr->get_arg1()->accept( *this );
[6c4ff37]654 output << " , ";
[51587aa]655 commaExpr->get_arg2()->accept( *this );
[6c4ff37]656 output << ")";
[51587aa]657 }
[71f4e4f]658
[907eccb]659 void CodeGenerator::visit( UntypedTupleExpr * tupleExpr ) { assertf( false, "UntypedTupleExpr should not make it to Code Gen" ); }
660
661 void CodeGenerator::visit( TupleExpr * tupleExpr ) { assertf( false, "TupleExpr should not make it to Code Gen" ); }
[71f4e4f]662
[8688ce1]663 void CodeGenerator::visit( TypeExpr * typeExpr ) {}
[2b6c1e0]664
[8688ce1]665 void CodeGenerator::visit( AsmExpr * asmExpr ) {
[7f5566b]666 if ( asmExpr->get_inout() ) {
667 output << "[ ";
668 asmExpr->get_inout()->accept( *this );
669 output << " ] ";
670 } // if
671 asmExpr->get_constraint()->accept( *this );
672 output << " ( ";
673 asmExpr->get_operand()->accept( *this );
674 output << " )";
675 }
676
[3c13c03]677 void CodeGenerator::visit( CompoundLiteralExpr *compLitExpr ) {
678 assert( compLitExpr->get_type() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
679 output << "(" << genType( compLitExpr->get_type(), "" ) << ")";
680 compLitExpr->get_initializer()->accept( *this );
681 }
682
[6eb8948]683 void CodeGenerator::visit( StmtExpr * stmtExpr ) {
[3c13c03]684 std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
685 output << "({" << std::endl;
686 cur_indent += CodeGenerator::tabsize;
687 unsigned int numStmts = stmts.size();
688 unsigned int i = 0;
689 for ( Statement * stmt : stmts ) {
690 output << indent << printLabels( stmt->get_labels() );
691 if ( i+1 == numStmts ) {
692 // last statement in a statement expression needs to be handled specially -
693 // cannot cast to void, otherwise the expression statement has no value
694 if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
695 exprStmt->get_expr()->accept( *this );
696 output << ";" << endl;
697 ++i;
698 break;
699 }
700 }
701 stmt->accept( *this );
702 output << endl;
703 if ( wantSpacing( stmt ) ) {
704 output << endl;
705 } // if
706 ++i;
707 }
708 cur_indent -= CodeGenerator::tabsize;
709 output << indent << "})";
[6eb8948]710 }
711
[51587aa]712 //*** Statements
[8688ce1]713 void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
[51587aa]714 std::list<Statement*> ks = compoundStmt->get_kids();
[2b6c1e0]715 output << "{" << endl;
[51587aa]716
[2b6c1e0]717 cur_indent += CodeGenerator::tabsize;
[51587aa]718
[7f5566b]719 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
[cda48b6]720 output << indent << printLabels( (*i)->get_labels() );
[7f5566b]721 (*i)->accept( *this );
[2b6c1e0]722
[6c4ff37]723 output << endl;
[2b6c1e0]724 if ( wantSpacing( *i ) ) {
725 output << endl;
[3778cb2]726 } // if
[8688ce1]727 } // for
[71f4e4f]728 cur_indent -= CodeGenerator::tabsize;
[51587aa]729
[cda48b6]730 output << indent << "}";
[51587aa]731 }
732
[8688ce1]733 void CodeGenerator::visit( ExprStmt * exprStmt ) {
[6c4ff37]734 assert( exprStmt );
[321a2481]735 // cast the top-level expression to void to reduce gcc warnings.
736 Expression * expr = new CastExpr( exprStmt->get_expr() );
737 expr->accept( *this );
738 output << ";";
[51587aa]739 }
740
[8688ce1]741 void CodeGenerator::visit( AsmStmt * asmStmt ) {
[7f5566b]742 output << "asm ";
743 if ( asmStmt->get_voltile() ) output << "volatile ";
744 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
745 output << "( ";
746 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
747 output << " : ";
748 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
749 output << " : ";
750 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
751 output << " : ";
752 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
753 if ( ! asmStmt->get_gotolabels().empty() ) {
754 output << " : ";
755 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
756 output << *begin++;
757 if ( begin == asmStmt->get_gotolabels().end() ) break;
758 output << ", ";
759 } // for
760 } // if
761 output << " );" ;
762 }
763
[8688ce1]764 void CodeGenerator::visit( IfStmt * ifStmt ) {
[7f5566b]765 output << "if ( ";
766 ifStmt->get_condition()->accept( *this );
767 output << " ) ";
[51587aa]768
[7f5566b]769 ifStmt->get_thenPart()->accept( *this );
[51587aa]770
771 if ( ifStmt->get_elsePart() != 0) {
[2b6c1e0]772 output << " else ";
[7f5566b]773 ifStmt->get_elsePart()->accept( *this );
[51587aa]774 } // if
775 }
776
[8688ce1]777 void CodeGenerator::visit( SwitchStmt * switchStmt ) {
[7f5566b]778 output << "switch ( " ;
779 switchStmt->get_condition()->accept( *this );
780 output << " ) ";
[71f4e4f]781
[2b6c1e0]782 output << "{" << std::endl;
[6c4ff37]783 cur_indent += CodeGenerator::tabsize;
[8688ce1]784 acceptAll( switchStmt->get_statements(), *this );
[6c4ff37]785 cur_indent -= CodeGenerator::tabsize;
[cda48b6]786 output << indent << "}";
[51587aa]787 }
788
[8688ce1]789 void CodeGenerator::visit( CaseStmt * caseStmt ) {
[cda48b6]790 output << indent;
[eb3261f]791 if ( caseStmt->isDefault()) {
[2b6c1e0]792 output << "default";
[eb3261f]793 } else {
[2b6c1e0]794 output << "case ";
[7f5566b]795 caseStmt->get_condition()->accept( *this );
[17cd4eb]796 } // if
[6c4ff37]797 output << ":\n";
[71f4e4f]798
[51587aa]799 std::list<Statement *> sts = caseStmt->get_statements();
800
[6c4ff37]801 cur_indent += CodeGenerator::tabsize;
[51587aa]802 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
[cda48b6]803 output << indent << printLabels( (*i)->get_labels() ) ;
[7f5566b]804 (*i)->accept( *this );
[6c4ff37]805 output << endl;
[3778cb2]806 } // for
[6c4ff37]807 cur_indent -= CodeGenerator::tabsize;
[51587aa]808 }
809
[8688ce1]810 void CodeGenerator::visit( BranchStmt * branchStmt ) {
[51587aa]811 switch ( branchStmt->get_type()) {
812 case BranchStmt::Goto:
813 if ( ! branchStmt->get_target().empty() )
[6c4ff37]814 output << "goto " << branchStmt->get_target();
[71f4e4f]815 else {
[51587aa]816 if ( branchStmt->get_computedTarget() != 0 ) {
[6c4ff37]817 output << "goto *";
[51587aa]818 branchStmt->get_computedTarget()->accept( *this );
819 } // if
820 } // if
821 break;
822 case BranchStmt::Break:
[6c4ff37]823 output << "break";
[51587aa]824 break;
825 case BranchStmt::Continue:
[6c4ff37]826 output << "continue";
[51587aa]827 break;
[3778cb2]828 } // switch
[2b6c1e0]829 output << ";";
[51587aa]830 }
831
832
[8688ce1]833 void CodeGenerator::visit( ReturnStmt * returnStmt ) {
[6c4ff37]834 output << "return ";
[4b2589a]835 maybeAccept( returnStmt->get_expr(), *this );
[6c4ff37]836 output << ";";
[51587aa]837 }
838
[8688ce1]839 void CodeGenerator::visit( WhileStmt * whileStmt ) {
[321a2481]840 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]841 output << "do" ;
[321a2481]842 } else {
[6c4ff37]843 output << "while (" ;
[7f5566b]844 whileStmt->get_condition()->accept( *this );
[6c4ff37]845 output << ")";
[51587aa]846 } // if
[2b6c1e0]847 output << " ";
[51587aa]848
[2b6c1e0]849 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
[51587aa]850 whileStmt->get_body()->accept( *this );
851
[cda48b6]852 output << indent;
[51587aa]853
854 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]855 output << " while (" ;
[7f5566b]856 whileStmt->get_condition()->accept( *this );
[6c4ff37]857 output << ");";
[51587aa]858 } // if
859 }
860
[8688ce1]861 void CodeGenerator::visit( ForStmt * forStmt ) {
[8e9cbb2]862 // initialization is always hoisted, so don't bother doing anything with that
[145f1fc]863 output << "for (;";
[51587aa]864
[321a2481]865 if ( forStmt->get_condition() != 0 ) {
[51587aa]866 forStmt->get_condition()->accept( *this );
[3778cb2]867 } // if
[6c4ff37]868 output << ";";
[51587aa]869
[321a2481]870 if ( forStmt->get_increment() != 0 ) {
871 // cast the top-level expression to void to reduce gcc warnings.
872 Expression * expr = new CastExpr( forStmt->get_increment() );
873 expr->accept( *this );
[3778cb2]874 } // if
[2b6c1e0]875 output << ") ";
[51587aa]876
877 if ( forStmt->get_body() != 0 ) {
[2b6c1e0]878 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
[51587aa]879 forStmt->get_body()->accept( *this );
880 } // if
881 }
882
[8688ce1]883 void CodeGenerator::visit( NullStmt * nullStmt ) {
[cda48b6]884 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
[6c4ff37]885 output << "/* null statement */ ;";
[51587aa]886 }
887
[8688ce1]888 void CodeGenerator::visit( DeclStmt * declStmt ) {
[51587aa]889 declStmt->get_decl()->accept( *this );
[71f4e4f]890
[51587aa]891 if ( doSemicolon( declStmt->get_decl() ) ) {
[6c4ff37]892 output << ";";
[51587aa]893 } // if
894 }
895
[8688ce1]896 void CodeGenerator::handleStorageClass( Declaration * decl ) {
[51587aa]897 switch ( decl->get_storageClass() ) {
[68cd1ce]898 case DeclarationNode::Extern:
[6c4ff37]899 output << "extern ";
[51587aa]900 break;
[68cd1ce]901 case DeclarationNode::Static:
[6c4ff37]902 output << "static ";
[51587aa]903 break;
[68cd1ce]904 case DeclarationNode::Auto:
[51587aa]905 // silently drop storage class
906 break;
[68cd1ce]907 case DeclarationNode::Register:
[6c4ff37]908 output << "register ";
[51587aa]909 break;
[68cd1ce]910 case DeclarationNode::Inline:
[de62360d]911 output << "inline ";
[f38c8d9]912 break;
[68cd1ce]913 case DeclarationNode::Fortran:
914 output << "fortran ";
915 break;
916 case DeclarationNode::Noreturn:
917 output << "_Noreturn ";
918 break;
919 case DeclarationNode::Threadlocal:
920 output << "_Thread_local ";
921 break;
922 case DeclarationNode::NoStorageClass:
[f38c8d9]923 break;
[843054c2]924 } // switch
[51587aa]925 }
[9facf3b]926
927 std::string genName( DeclarationWithType * decl ) {
928 CodeGen::OperatorInfo opInfo;
929 if ( operatorLookup( decl->get_name(), opInfo ) ) {
930 return opInfo.outputName;
931 } else {
932 return decl->get_name();
933 } // if
934 }
[51b73452]935} // namespace CodeGen
[51587aa]936
937// Local Variables: //
938// tab-width: 4 //
939// mode: c++ //
940// compile-command: "make install" //
941// End: //
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