source: src/CodeGen/CodeGenerator.cc@ f0121d7

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 f0121d7 was 3c13c03, checked in by Rob Schluntz <rschlunt@…>, 9 years ago

expand TupleExpr and TupleIndexExpr, add UniqueExpr
  • Property mode set to 100644
File size: 26.5 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
[064e3ff]12// Last Modified On : Thu Aug 4 13:35:30 2016
13// Update Count : 352
[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
[888cbe4]62 ostream & CodeGenerator::Indenter::operator()( ostream & output ) const {
[cda48b6]63 return output << string( cg.cur_indent, ' ' );
64 }
65
[888cbe4]66 ostream & operator<<( ostream & output, const CodeGenerator::Indenter &indent ) {
[cda48b6]67 return indent( output );
68 }
[51587aa]69
[888cbe4]70 CodeGenerator::LabelPrinter & CodeGenerator::LabelPrinter::operator()( std::list< Label > & l ) {
71 labels = &l;
72 return *this;
73 }
74
[8688ce1]75 ostream & operator<<( ostream & output, CodeGenerator::LabelPrinter & printLabels ) {
[888cbe4]76 std::list< Label > & labs = *printLabels.labels;
77 // l.unique(); // assumes a sorted list. Why not use set? Does order matter?
78 for ( Label & l : labs ) {
79 output << l.get_name() + ": ";
80 printLabels.cg.genAttributes( l.get_attributes() );
[8688ce1]81 } // for
[888cbe4]82 return output;
83 }
84
[486341f]85 CodeGenerator::CodeGenerator( std::ostream & os, bool mangle ) : indent( *this), cur_indent( 0 ), insideFunction( false ), output( os ), printLabels( *this ), mangle( mangle ) {}
[cda48b6]86
[8688ce1]87 CodeGenerator::CodeGenerator( std::ostream & os, std::string init, int indentation, bool infunp )
[888cbe4]88 : indent( *this), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( *this ) {
[6c4ff37]89 //output << std::string( init );
[51587aa]90 }
91
[8688ce1]92 CodeGenerator::CodeGenerator( std::ostream & os, char * init, int indentation, bool infunp )
[888cbe4]93 : indent( *this ), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( *this ) {
[6c4ff37]94 //output << std::string( init );
[51587aa]95 }
96
[486341f]97 string CodeGenerator::mangleName( DeclarationWithType * decl ) {
98 if ( ! mangle ) return decl->get_name();
[51587aa]99 if ( decl->get_mangleName() != "" ) {
[f326f99]100 // need to incorporate scope level in order to differentiate names for destructors
101 return decl->get_scopedMangleName();
[51587aa]102 } else {
103 return decl->get_name();
104 } // if
105 }
[94b4364]106
[7baed7d]107 void CodeGenerator::genAttributes( std::list< Attribute * > & attributes ) {
108 if ( ! attributes.empty() ) {
109 output << "__attribute__ ((";
110 for ( Attribute *& attr : attributes ) {
111 if ( ! attr->empty() ) {
112 output << attr->get_name() << "(";
113 genCommaList( attr->get_parameters().begin(), attr->get_parameters().end() );
114 output << ")";
[8688ce1]115 } // if
[7baed7d]116 output << ",";
[8688ce1]117 } // for
[7baed7d]118 output << ")) ";
[8688ce1]119 } // if
[7baed7d]120 }
121
122
123 //*** Declarations
[8688ce1]124 void CodeGenerator::visit( FunctionDecl * functionDecl ) {
[8e9cbb2]125 extension( functionDecl );
[7baed7d]126 genAttributes( functionDecl->get_attributes() );
127
[51587aa]128 handleStorageClass( functionDecl );
[f38c8d9]129 if ( functionDecl->get_isInline() ) {
[6c4ff37]130 output << "inline ";
[f38c8d9]131 } // if
[de62360d]132 if ( functionDecl->get_isNoreturn() ) {
133 output << "_Noreturn ";
134 } // if
[6c4ff37]135 output << genType( functionDecl->get_functionType(), mangleName( functionDecl ) );
[51587aa]136
137 // how to get this to the Functype?
138 std::list< Declaration * > olds = functionDecl->get_oldDecls();
139 if ( ! olds.empty() ) {
[6c4ff37]140 output << " /* function has old declaration */";
[51587aa]141 } // if
142
143 // acceptAll( functionDecl->get_oldDecls(), *this );
144 if ( functionDecl->get_statements() ) {
[7f5566b]145 functionDecl->get_statements()->accept( *this );
[51587aa]146 } // if
147 }
148
[8688ce1]149 void CodeGenerator::visit( ObjectDecl * objectDecl ) {
[8e9cbb2]150 extension( objectDecl );
[f9cebb5]151 genAttributes( objectDecl->get_attributes() );
152
[51587aa]153 handleStorageClass( objectDecl );
[6c4ff37]154 output << genType( objectDecl->get_type(), mangleName( objectDecl ) );
[71f4e4f]155
[51587aa]156 if ( objectDecl->get_init() ) {
[6c4ff37]157 output << " = ";
[51587aa]158 objectDecl->get_init()->accept( *this );
159 } // if
[3778cb2]160
[51587aa]161 if ( objectDecl->get_bitfieldWidth() ) {
[6c4ff37]162 output << ":";
[51587aa]163 objectDecl->get_bitfieldWidth()->accept( *this );
164 } // if
165 }
166
[8688ce1]167 void CodeGenerator::handleAggregate( AggregateDecl * aggDecl ) {
[51587aa]168 if ( aggDecl->get_name() != "" )
[6c4ff37]169 output << aggDecl->get_name();
[71f4e4f]170
[8688ce1]171 std::list< Declaration * > & memb = aggDecl->get_members();
[51587aa]172 if ( ! memb.empty() ) {
[5d125e4]173// if ( aggDecl->has_body() ) {
[8688ce1]174// std::list< Declaration * > & memb = aggDecl->get_members();
[94b4364]175 output << " {" << endl;
[51587aa]176
[71f4e4f]177 cur_indent += CodeGenerator::tabsize;
[3778cb2]178 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
[71f4e4f]179 output << indent;
[7f5566b]180 (*i)->accept( *this );
[6c4ff37]181 output << ";" << endl;
[3778cb2]182 } // for
[51587aa]183
[71f4e4f]184 cur_indent -= CodeGenerator::tabsize;
[51587aa]185
[cda48b6]186 output << indent << "}";
[17cd4eb]187 } // if
[51587aa]188 }
[17cd4eb]189
[8688ce1]190 void CodeGenerator::visit( StructDecl * structDecl ) {
[8e9cbb2]191 extension( structDecl );
[6c4ff37]192 output << "struct ";
[51587aa]193 handleAggregate( structDecl );
194 }
[17cd4eb]195
[8688ce1]196 void CodeGenerator::visit( UnionDecl * unionDecl ) {
[8e9cbb2]197 extension( unionDecl );
[6c4ff37]198 output << "union ";
[8e9cbb2]199 handleAggregate( unionDecl );
[51587aa]200 }
[71f4e4f]201
[8688ce1]202 void CodeGenerator::visit( EnumDecl * enumDecl ) {
[8e9cbb2]203 extension( enumDecl );
[6c4ff37]204 output << "enum ";
[51587aa]205
[8e9cbb2]206 if ( enumDecl->get_name() != "" )
207 output << enumDecl->get_name();
[71f4e4f]208
[8e9cbb2]209 std::list< Declaration* > &memb = enumDecl->get_members();
[51587aa]210
211 if ( ! memb.empty() ) {
[cda48b6]212 output << " {" << endl;
[51587aa]213
[71f4e4f]214 cur_indent += CodeGenerator::tabsize;
[51587aa]215 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
[8688ce1]216 ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
[51587aa]217 assert( obj );
[71f4e4f]218 output << indent << mangleName( obj );
[51587aa]219 if ( obj->get_init() ) {
[6c4ff37]220 output << " = ";
[7f5566b]221 obj->get_init()->accept( *this );
[51587aa]222 } // if
[6c4ff37]223 output << "," << endl;
[51587aa]224 } // for
225
[71f4e4f]226 cur_indent -= CodeGenerator::tabsize;
[51587aa]227
[cda48b6]228 output << indent << "}";
[51587aa]229 } // if
230 }
[71f4e4f]231
[8688ce1]232 void CodeGenerator::visit( TraitDecl * traitDecl ) {}
[71f4e4f]233
[8688ce1]234 void CodeGenerator::visit( TypedefDecl * typeDecl ) {
[8e9cbb2]235 assert( false && "Typedefs are removed and substituted in earlier passes." );
236 //output << "typedef ";
237 //output << genType( typeDecl->get_base(), typeDecl->get_name() );
[51587aa]238 }
[71f4e4f]239
[8688ce1]240 void CodeGenerator::visit( TypeDecl * typeDecl ) {
[51587aa]241 // really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
242 // still to be done
[8e9cbb2]243 extension( typeDecl );
[6c4ff37]244 output << "extern unsigned long " << typeDecl->get_name();
[51587aa]245 if ( typeDecl->get_base() ) {
[6c4ff37]246 output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )";
[51587aa]247 } // if
248 }
249
[e45215c]250 void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
251 typedef std::list< Expression * > DesignatorList;
252 if ( designators.size() == 0 ) return;
253 for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
[8a4da06]254 if ( dynamic_cast< NameExpr * >( *iter ) ) {
[f32c7f4]255 // if expression is a name, then initializing aggregate member
256 output << ".";
257 (*iter)->accept( *this );
258 } else {
259 // if not a simple name, it has to be a constant expression, i.e. an array designator
[e45215c]260 output << "[";
261 (*iter)->accept( *this );
262 output << "]";
[3778cb2]263 } // if
264 } // for
[e45215c]265 output << " = ";
266 }
267
[8688ce1]268 void CodeGenerator::visit( SingleInit * init ) {
[e45215c]269 printDesignators( init->get_designators() );
[51587aa]270 init->get_value()->accept( *this );
271 }
272
[8688ce1]273 void CodeGenerator::visit( ListInit * init ) {
[e45215c]274 printDesignators( init->get_designators() );
[6c4ff37]275 output << "{ ";
[4d2434a]276 if ( init->begin() == init->end() ) {
[8e9cbb2]277 // illegal to leave initializer list empty for scalar initializers, but always legal to have 0
[5b40f30]278 output << "0";
279 } else {
[4d2434a]280 genCommaList( init->begin(), init->end() );
[8688ce1]281 } // if
[6c4ff37]282 output << " }";
[51587aa]283 }
284
[8688ce1]285 void CodeGenerator::visit( Constant * constant ) {
[6c4ff37]286 output << constant->get_value() ;
[51587aa]287 }
288
289 //*** Expressions
[8688ce1]290 void CodeGenerator::visit( ApplicationExpr * applicationExpr ) {
[e04ef3a]291 extension( applicationExpr );
[8688ce1]292 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
[51587aa]293 OperatorInfo opInfo;
294 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
295 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
296 switch ( opInfo.type ) {
297 case OT_PREFIXASSIGN:
298 case OT_POSTFIXASSIGN:
299 case OT_INFIXASSIGN:
[356189a]300 case OT_CTOR:
[c2ce2350]301 case OT_DTOR:
[51587aa]302 {
303 assert( arg != applicationExpr->get_args().end() );
[8688ce1]304 if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) {
[356189a]305 // remove & from first assignment/ctor argument
[51587aa]306 *arg = addrExpr->get_arg();
307 } else {
[356189a]308 // no address-of operator, so must be a pointer - add dereference
[8688ce1]309 UntypedExpr * newExpr = new UntypedExpr( new NameExpr( "*?" ) );
[51587aa]310 newExpr->get_args().push_back( *arg );
[906e24d]311 Type * type = InitTweak::getPointerBase( (*arg)->get_result() );
[10a7775]312 assert( type );
[906e24d]313 newExpr->set_result( type->clone() );
[51587aa]314 *arg = newExpr;
315 } // if
316 break;
317 }
[71f4e4f]318
[51587aa]319 default:
320 // do nothing
321 ;
[3778cb2]322 } // switch
[71f4e4f]323
[51587aa]324 switch ( opInfo.type ) {
325 case OT_INDEX:
326 assert( applicationExpr->get_args().size() == 2 );
327 (*arg++)->accept( *this );
[6c4ff37]328 output << "[";
[51587aa]329 (*arg)->accept( *this );
[6c4ff37]330 output << "]";
[51587aa]331 break;
[71f4e4f]332
[51587aa]333 case OT_CALL:
[356189a]334 // there are no intrinsic definitions of the function call operator
[51587aa]335 assert( false );
336 break;
[71f4e4f]337
[f1e012b]338 case OT_CTOR:
[c2ce2350]339 case OT_DTOR:
[356189a]340 if ( applicationExpr->get_args().size() == 1 ) {
[8e9cbb2]341 // the expression fed into a single parameter constructor or destructor may contain side
342 // effects, so must still output this expression
[64071c2]343 output << "(";
[356189a]344 (*arg++)->accept( *this );
[64071c2]345 output << ") /* " << opInfo.inputName << " */";
[356189a]346 } else if ( applicationExpr->get_args().size() == 2 ) {
[c2ce2350]347 // intrinsic two parameter constructors are essentially bitwise assignment
[356189a]348 output << "(";
349 (*arg++)->accept( *this );
350 output << opInfo.symbol;
351 (*arg)->accept( *this );
[c2ce2350]352 output << ") /* " << opInfo.inputName << " */";
[356189a]353 } else {
[c2ce2350]354 // no constructors with 0 or more than 2 parameters
[356189a]355 assert( false );
[8688ce1]356 } // if
[356189a]357 break;
[f1e012b]358
[51587aa]359 case OT_PREFIX:
360 case OT_PREFIXASSIGN:
361 assert( applicationExpr->get_args().size() == 1 );
[6c4ff37]362 output << "(";
363 output << opInfo.symbol;
[51587aa]364 (*arg)->accept( *this );
[6c4ff37]365 output << ")";
[51587aa]366 break;
[71f4e4f]367
[51587aa]368 case OT_POSTFIX:
369 case OT_POSTFIXASSIGN:
370 assert( applicationExpr->get_args().size() == 1 );
371 (*arg)->accept( *this );
[6c4ff37]372 output << opInfo.symbol;
[51587aa]373 break;
374
[f1e012b]375
[51587aa]376 case OT_INFIX:
377 case OT_INFIXASSIGN:
378 assert( applicationExpr->get_args().size() == 2 );
[6c4ff37]379 output << "(";
[51587aa]380 (*arg++)->accept( *this );
[6c4ff37]381 output << opInfo.symbol;
[51587aa]382 (*arg)->accept( *this );
[6c4ff37]383 output << ")";
[51587aa]384 break;
[71f4e4f]385
[51587aa]386 case OT_CONSTANT:
[721f17a]387 case OT_LABELADDRESS:
388 // there are no intrinsic definitions of 0/1 or label addresses as functions
[51587aa]389 assert( false );
[3778cb2]390 } // switch
[17cd4eb]391 } else {
[51587aa]392 varExpr->accept( *this );
[6c4ff37]393 output << "(";
[51587aa]394 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]395 output << ")";
[17cd4eb]396 } // if
[51587aa]397 } else {
398 applicationExpr->get_function()->accept( *this );
[6c4ff37]399 output << "(";
[51587aa]400 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]401 output << ")";
[51587aa]402 } // if
403 }
[71f4e4f]404
[8688ce1]405 void CodeGenerator::visit( UntypedExpr * untypedExpr ) {
[e04ef3a]406 extension( untypedExpr );
[8688ce1]407 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
[51587aa]408 OperatorInfo opInfo;
409 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
410 std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
411 switch ( opInfo.type ) {
412 case OT_INDEX:
413 assert( untypedExpr->get_args().size() == 2 );
414 (*arg++)->accept( *this );
[6c4ff37]415 output << "[";
[51587aa]416 (*arg)->accept( *this );
[6c4ff37]417 output << "]";
[51587aa]418 break;
[71f4e4f]419
[51587aa]420 case OT_CALL:
[f1e012b]421 assert( false );
422
[c2ce2350]423 case OT_CTOR:
424 case OT_DTOR:
425 if ( untypedExpr->get_args().size() == 1 ) {
[8e9cbb2]426 // the expression fed into a single parameter constructor or destructor may contain side
427 // effects, so must still output this expression
[64071c2]428 output << "(";
[c2ce2350]429 (*arg++)->accept( *this );
[64071c2]430 output << ") /* " << opInfo.inputName << " */";
[c2ce2350]431 } else if ( untypedExpr->get_args().size() == 2 ) {
432 // intrinsic two parameter constructors are essentially bitwise assignment
433 output << "(";
434 (*arg++)->accept( *this );
435 output << opInfo.symbol;
436 (*arg)->accept( *this );
437 output << ") /* " << opInfo.inputName << " */";
438 } else {
439 // no constructors with 0 or more than 2 parameters
440 assert( false );
[3778cb2]441 } // if
[51587aa]442 break;
[71f4e4f]443
[51587aa]444 case OT_PREFIX:
445 case OT_PREFIXASSIGN:
[de62360d]446 case OT_LABELADDRESS:
[51587aa]447 assert( untypedExpr->get_args().size() == 1 );
[6c4ff37]448 output << "(";
449 output << opInfo.symbol;
[51587aa]450 (*arg)->accept( *this );
[6c4ff37]451 output << ")";
[51587aa]452 break;
[71f4e4f]453
[51587aa]454 case OT_POSTFIX:
455 case OT_POSTFIXASSIGN:
456 assert( untypedExpr->get_args().size() == 1 );
457 (*arg)->accept( *this );
[6c4ff37]458 output << opInfo.symbol;
[51587aa]459 break;
[71f4e4f]460
[51587aa]461 case OT_INFIX:
462 case OT_INFIXASSIGN:
463 assert( untypedExpr->get_args().size() == 2 );
[6c4ff37]464 output << "(";
[51587aa]465 (*arg++)->accept( *this );
[6c4ff37]466 output << opInfo.symbol;
[51587aa]467 (*arg)->accept( *this );
[6c4ff37]468 output << ")";
[51587aa]469 break;
[71f4e4f]470
[51587aa]471 case OT_CONSTANT:
472 // there are no intrinsic definitions of 0 or 1 as functions
473 assert( false );
[3778cb2]474 } // switch
[51587aa]475 } else {
[8688ce1]476 if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
[ac911f4]477 assert( untypedExpr->get_args().size() == 2 );
478 (*untypedExpr->get_args().begin())->accept( *this );
479 output << " ... ";
480 (*--untypedExpr->get_args().end())->accept( *this );
[057b34f]481 } else { // builtin routines
482 nameExpr->accept( *this );
483 output << "(";
484 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
485 output << ")";
[66d12f7]486 } // if
[51587aa]487 } // if
488 } else {
489 untypedExpr->get_function()->accept( *this );
[6c4ff37]490 output << "(";
[51587aa]491 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
[6c4ff37]492 output << ")";
[51587aa]493 } // if
494 }
[71f4e4f]495
[064e3ff]496 void CodeGenerator::visit( RangeExpr * rangeExpr ) {
497 rangeExpr->get_low()->accept( *this );
498 output << " ... ";
499 rangeExpr->get_high()->accept( *this );
500 }
501
[8688ce1]502 void CodeGenerator::visit( NameExpr * nameExpr ) {
[e04ef3a]503 extension( nameExpr );
[51587aa]504 OperatorInfo opInfo;
505 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
506 assert( opInfo.type == OT_CONSTANT );
[6c4ff37]507 output << opInfo.symbol;
[51587aa]508 } else {
[6c4ff37]509 output << nameExpr->get_name();
[51587aa]510 } // if
511 }
[71f4e4f]512
[8688ce1]513 void CodeGenerator::visit( AddressExpr * addressExpr ) {
[e04ef3a]514 extension( addressExpr );
[6c4ff37]515 output << "(&";
[51587aa]516 // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
[8688ce1]517 if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
[6c4ff37]518 output << mangleName( variableExpr->get_var() );
[51587aa]519 } else {
520 addressExpr->get_arg()->accept( *this );
521 } // if
[6c4ff37]522 output << ")";
[51587aa]523 }
524
[8688ce1]525 void CodeGenerator::visit( CastExpr * castExpr ) {
[e04ef3a]526 extension( castExpr );
[803deb1]527 output << "(";
[906e24d]528 if ( castExpr->get_result()->isVoid() ) {
[803deb1]529 output << "(void)" ;
[906e24d]530 } else if ( ! castExpr->get_result()->get_isLvalue() ) {
[803deb1]531 // at least one result type of cast, but not an lvalue
532 output << "(";
[906e24d]533 output << genType( castExpr->get_result(), "" );
[71f4e4f]534 output << ")";
[803deb1]535 } else {
[8e9cbb2]536 // otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
[803deb1]537 // never an lvalue in C
[3778cb2]538 } // if
[803deb1]539 castExpr->get_arg()->accept( *this );
540 output << ")";
[51587aa]541 }
[71f4e4f]542
[8688ce1]543 void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) {
[51587aa]544 assert( false );
545 }
[71f4e4f]546
[8688ce1]547 void CodeGenerator::visit( MemberExpr * memberExpr ) {
[e04ef3a]548 extension( memberExpr );
[51587aa]549 memberExpr->get_aggregate()->accept( *this );
[6c4ff37]550 output << "." << mangleName( memberExpr->get_member() );
[51587aa]551 }
[71f4e4f]552
[8688ce1]553 void CodeGenerator::visit( VariableExpr * variableExpr ) {
[e04ef3a]554 extension( variableExpr );
[51587aa]555 OperatorInfo opInfo;
556 if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
[6c4ff37]557 output << opInfo.symbol;
[51587aa]558 } else {
[6c4ff37]559 output << mangleName( variableExpr->get_var() );
[51587aa]560 } // if
561 }
[71f4e4f]562
[8688ce1]563 void CodeGenerator::visit( ConstantExpr * constantExpr ) {
[51587aa]564 assert( constantExpr->get_constant() );
[e04ef3a]565 extension( constantExpr );
[51587aa]566 constantExpr->get_constant()->accept( *this );
567 }
[71f4e4f]568
[8688ce1]569 void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
[e04ef3a]570 extension( sizeofExpr );
[6c4ff37]571 output << "sizeof(";
[51587aa]572 if ( sizeofExpr->get_isType() ) {
[6c4ff37]573 output << genType( sizeofExpr->get_type(), "" );
[51587aa]574 } else {
575 sizeofExpr->get_expr()->accept( *this );
576 } // if
[6c4ff37]577 output << ")";
[51587aa]578 }
[47534159]579
[8688ce1]580 void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
[47534159]581 // use GCC extension to avoid bumping std to C11
[8e9cbb2]582 extension( alignofExpr );
[47534159]583 output << "__alignof__(";
[25a054f]584 if ( alignofExpr->get_isType() ) {
585 output << genType( alignofExpr->get_type(), "" );
[47534159]586 } else {
[25a054f]587 alignofExpr->get_expr()->accept( *this );
[47534159]588 } // if
589 output << ")";
590 }
[71f4e4f]591
[8688ce1]592 void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
[8e9cbb2]593 assert( false && "UntypedOffsetofExpr should not reach code generation." );
[2a4b088]594 }
595
[8688ce1]596 void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
[25a054f]597 // use GCC builtin
598 output << "__builtin_offsetof(";
599 output << genType( offsetofExpr->get_type(), "" );
[e551c69]600 output << ", " << mangleName( offsetofExpr->get_member() );
[25a054f]601 output << ")";
602 }
[d63eeb0]603
[8688ce1]604 void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
[8e9cbb2]605 assert( false && "OffsetPackExpr should not reach code generation." );
[afc1045]606 }
[70a06f6]607
[8688ce1]608 void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
[e04ef3a]609 extension( logicalExpr );
[6c4ff37]610 output << "(";
[51587aa]611 logicalExpr->get_arg1()->accept( *this );
612 if ( logicalExpr->get_isAnd() ) {
[6c4ff37]613 output << " && ";
[51587aa]614 } else {
[6c4ff37]615 output << " || ";
[51587aa]616 } // if
617 logicalExpr->get_arg2()->accept( *this );
[6c4ff37]618 output << ")";
[51587aa]619 }
[71f4e4f]620
[8688ce1]621 void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
[e04ef3a]622 extension( conditionalExpr );
[6c4ff37]623 output << "(";
[51587aa]624 conditionalExpr->get_arg1()->accept( *this );
[6c4ff37]625 output << " ? ";
[51587aa]626 conditionalExpr->get_arg2()->accept( *this );
[6c4ff37]627 output << " : ";
[51587aa]628 conditionalExpr->get_arg3()->accept( *this );
[6c4ff37]629 output << ")";
[51587aa]630 }
[71f4e4f]631
[8688ce1]632 void CodeGenerator::visit( CommaExpr * commaExpr ) {
[e04ef3a]633 extension( commaExpr );
[6c4ff37]634 output << "(";
[51587aa]635 commaExpr->get_arg1()->accept( *this );
[6c4ff37]636 output << " , ";
[51587aa]637 commaExpr->get_arg2()->accept( *this );
[6c4ff37]638 output << ")";
[51587aa]639 }
[71f4e4f]640
[3c13c03]641 void CodeGenerator::visit( TupleExpr * tupleExpr ) { assert( false ); }
[71f4e4f]642
[8688ce1]643 void CodeGenerator::visit( TypeExpr * typeExpr ) {}
[2b6c1e0]644
[8688ce1]645 void CodeGenerator::visit( AsmExpr * asmExpr ) {
[7f5566b]646 if ( asmExpr->get_inout() ) {
647 output << "[ ";
648 asmExpr->get_inout()->accept( *this );
649 output << " ] ";
650 } // if
651 asmExpr->get_constraint()->accept( *this );
652 output << " ( ";
653 asmExpr->get_operand()->accept( *this );
654 output << " )";
655 }
656
[3c13c03]657 void CodeGenerator::visit( CompoundLiteralExpr *compLitExpr ) {
658 assert( compLitExpr->get_type() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
659 output << "(" << genType( compLitExpr->get_type(), "" ) << ")";
660 compLitExpr->get_initializer()->accept( *this );
661 }
662
[6eb8948]663 void CodeGenerator::visit( StmtExpr * stmtExpr ) {
[3c13c03]664 std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
665 output << "({" << std::endl;
666 cur_indent += CodeGenerator::tabsize;
667 unsigned int numStmts = stmts.size();
668 unsigned int i = 0;
669 for ( Statement * stmt : stmts ) {
670 output << indent << printLabels( stmt->get_labels() );
671 if ( i+1 == numStmts ) {
672 // last statement in a statement expression needs to be handled specially -
673 // cannot cast to void, otherwise the expression statement has no value
674 if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
675 exprStmt->get_expr()->accept( *this );
676 output << ";" << endl;
677 ++i;
678 break;
679 }
680 }
681 stmt->accept( *this );
682 output << endl;
683 if ( wantSpacing( stmt ) ) {
684 output << endl;
685 } // if
686 ++i;
687 }
688 cur_indent -= CodeGenerator::tabsize;
689 output << indent << "})";
[6eb8948]690 }
691
[51587aa]692 //*** Statements
[8688ce1]693 void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
[51587aa]694 std::list<Statement*> ks = compoundStmt->get_kids();
[2b6c1e0]695 output << "{" << endl;
[51587aa]696
[2b6c1e0]697 cur_indent += CodeGenerator::tabsize;
[51587aa]698
[7f5566b]699 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
[cda48b6]700 output << indent << printLabels( (*i)->get_labels() );
[7f5566b]701 (*i)->accept( *this );
[2b6c1e0]702
[6c4ff37]703 output << endl;
[2b6c1e0]704 if ( wantSpacing( *i ) ) {
705 output << endl;
[3778cb2]706 } // if
[8688ce1]707 } // for
[71f4e4f]708 cur_indent -= CodeGenerator::tabsize;
[51587aa]709
[cda48b6]710 output << indent << "}";
[51587aa]711 }
712
[8688ce1]713 void CodeGenerator::visit( ExprStmt * exprStmt ) {
[6c4ff37]714 assert( exprStmt );
[321a2481]715 // cast the top-level expression to void to reduce gcc warnings.
716 Expression * expr = new CastExpr( exprStmt->get_expr() );
717 expr->accept( *this );
718 output << ";";
[51587aa]719 }
720
[8688ce1]721 void CodeGenerator::visit( AsmStmt * asmStmt ) {
[7f5566b]722 output << "asm ";
723 if ( asmStmt->get_voltile() ) output << "volatile ";
724 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
725 output << "( ";
726 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
727 output << " : ";
728 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
729 output << " : ";
730 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
731 output << " : ";
732 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
733 if ( ! asmStmt->get_gotolabels().empty() ) {
734 output << " : ";
735 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
736 output << *begin++;
737 if ( begin == asmStmt->get_gotolabels().end() ) break;
738 output << ", ";
739 } // for
740 } // if
741 output << " );" ;
742 }
743
[8688ce1]744 void CodeGenerator::visit( IfStmt * ifStmt ) {
[7f5566b]745 output << "if ( ";
746 ifStmt->get_condition()->accept( *this );
747 output << " ) ";
[51587aa]748
[7f5566b]749 ifStmt->get_thenPart()->accept( *this );
[51587aa]750
751 if ( ifStmt->get_elsePart() != 0) {
[2b6c1e0]752 output << " else ";
[7f5566b]753 ifStmt->get_elsePart()->accept( *this );
[51587aa]754 } // if
755 }
756
[8688ce1]757 void CodeGenerator::visit( SwitchStmt * switchStmt ) {
[7f5566b]758 output << "switch ( " ;
759 switchStmt->get_condition()->accept( *this );
760 output << " ) ";
[71f4e4f]761
[2b6c1e0]762 output << "{" << std::endl;
[6c4ff37]763 cur_indent += CodeGenerator::tabsize;
[8688ce1]764 acceptAll( switchStmt->get_statements(), *this );
[6c4ff37]765 cur_indent -= CodeGenerator::tabsize;
[cda48b6]766 output << indent << "}";
[51587aa]767 }
768
[8688ce1]769 void CodeGenerator::visit( CaseStmt * caseStmt ) {
[cda48b6]770 output << indent;
[eb3261f]771 if ( caseStmt->isDefault()) {
[2b6c1e0]772 output << "default";
[eb3261f]773 } else {
[2b6c1e0]774 output << "case ";
[7f5566b]775 caseStmt->get_condition()->accept( *this );
[17cd4eb]776 } // if
[6c4ff37]777 output << ":\n";
[71f4e4f]778
[51587aa]779 std::list<Statement *> sts = caseStmt->get_statements();
780
[6c4ff37]781 cur_indent += CodeGenerator::tabsize;
[51587aa]782 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
[cda48b6]783 output << indent << printLabels( (*i)->get_labels() ) ;
[7f5566b]784 (*i)->accept( *this );
[6c4ff37]785 output << endl;
[3778cb2]786 } // for
[6c4ff37]787 cur_indent -= CodeGenerator::tabsize;
[51587aa]788 }
789
[8688ce1]790 void CodeGenerator::visit( BranchStmt * branchStmt ) {
[51587aa]791 switch ( branchStmt->get_type()) {
792 case BranchStmt::Goto:
793 if ( ! branchStmt->get_target().empty() )
[6c4ff37]794 output << "goto " << branchStmt->get_target();
[71f4e4f]795 else {
[51587aa]796 if ( branchStmt->get_computedTarget() != 0 ) {
[6c4ff37]797 output << "goto *";
[51587aa]798 branchStmt->get_computedTarget()->accept( *this );
799 } // if
800 } // if
801 break;
802 case BranchStmt::Break:
[6c4ff37]803 output << "break";
[51587aa]804 break;
805 case BranchStmt::Continue:
[6c4ff37]806 output << "continue";
[51587aa]807 break;
[3778cb2]808 } // switch
[2b6c1e0]809 output << ";";
[51587aa]810 }
811
812
[8688ce1]813 void CodeGenerator::visit( ReturnStmt * returnStmt ) {
[6c4ff37]814 output << "return ";
[4b2589a]815 maybeAccept( returnStmt->get_expr(), *this );
[6c4ff37]816 output << ";";
[51587aa]817 }
818
[8688ce1]819 void CodeGenerator::visit( WhileStmt * whileStmt ) {
[321a2481]820 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]821 output << "do" ;
[321a2481]822 } else {
[6c4ff37]823 output << "while (" ;
[7f5566b]824 whileStmt->get_condition()->accept( *this );
[6c4ff37]825 output << ")";
[51587aa]826 } // if
[2b6c1e0]827 output << " ";
[51587aa]828
[2b6c1e0]829 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
[51587aa]830 whileStmt->get_body()->accept( *this );
831
[cda48b6]832 output << indent;
[51587aa]833
834 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]835 output << " while (" ;
[7f5566b]836 whileStmt->get_condition()->accept( *this );
[6c4ff37]837 output << ");";
[51587aa]838 } // if
839 }
840
[8688ce1]841 void CodeGenerator::visit( ForStmt * forStmt ) {
[8e9cbb2]842 // initialization is always hoisted, so don't bother doing anything with that
[145f1fc]843 output << "for (;";
[51587aa]844
[321a2481]845 if ( forStmt->get_condition() != 0 ) {
[51587aa]846 forStmt->get_condition()->accept( *this );
[3778cb2]847 } // if
[6c4ff37]848 output << ";";
[51587aa]849
[321a2481]850 if ( forStmt->get_increment() != 0 ) {
851 // cast the top-level expression to void to reduce gcc warnings.
852 Expression * expr = new CastExpr( forStmt->get_increment() );
853 expr->accept( *this );
[3778cb2]854 } // if
[2b6c1e0]855 output << ") ";
[51587aa]856
857 if ( forStmt->get_body() != 0 ) {
[2b6c1e0]858 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
[51587aa]859 forStmt->get_body()->accept( *this );
860 } // if
861 }
862
[8688ce1]863 void CodeGenerator::visit( NullStmt * nullStmt ) {
[cda48b6]864 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
[6c4ff37]865 output << "/* null statement */ ;";
[51587aa]866 }
867
[8688ce1]868 void CodeGenerator::visit( DeclStmt * declStmt ) {
[51587aa]869 declStmt->get_decl()->accept( *this );
[71f4e4f]870
[51587aa]871 if ( doSemicolon( declStmt->get_decl() ) ) {
[6c4ff37]872 output << ";";
[51587aa]873 } // if
874 }
875
[8688ce1]876 void CodeGenerator::handleStorageClass( Declaration * decl ) {
[51587aa]877 switch ( decl->get_storageClass() ) {
[68cd1ce]878 case DeclarationNode::Extern:
[6c4ff37]879 output << "extern ";
[51587aa]880 break;
[68cd1ce]881 case DeclarationNode::Static:
[6c4ff37]882 output << "static ";
[51587aa]883 break;
[68cd1ce]884 case DeclarationNode::Auto:
[51587aa]885 // silently drop storage class
886 break;
[68cd1ce]887 case DeclarationNode::Register:
[6c4ff37]888 output << "register ";
[51587aa]889 break;
[68cd1ce]890 case DeclarationNode::Inline:
[de62360d]891 output << "inline ";
[f38c8d9]892 break;
[68cd1ce]893 case DeclarationNode::Fortran:
894 output << "fortran ";
895 break;
896 case DeclarationNode::Noreturn:
897 output << "_Noreturn ";
898 break;
899 case DeclarationNode::Threadlocal:
900 output << "_Thread_local ";
901 break;
902 case DeclarationNode::NoStorageClass:
[f38c8d9]903 break;
[843054c2]904 } // switch
[51587aa]905 }
[51b73452]906} // namespace CodeGen
[51587aa]907
908// Local Variables: //
909// tab-width: 4 //
910// mode: c++ //
911// compile-command: "make install" //
912// End: //
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