source: src/CodeGen/CodeGenerator.cc@ 6d7c3df

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 6d7c3df was 486341f, checked in by Rob Schluntz <rschlunt@…>, 9 years ago

add option to CodeGen to output unmangled name, add ctorWarnings test
  • Property mode set to 100644
File size: 25.4 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 );
[10a7775]311 assert( (*arg)->get_results().size() == 1 );
312 Type * type = InitTweak::getPointerBase( (*arg)->get_results().front() );
313 assert( type );
[03b812d2]314 newExpr->get_results().push_back( type->clone() );
[51587aa]315 *arg = newExpr;
316 } // if
317 break;
318 }
[71f4e4f]319
[51587aa]320 default:
321 // do nothing
322 ;
[3778cb2]323 } // switch
[71f4e4f]324
[51587aa]325 switch ( opInfo.type ) {
326 case OT_INDEX:
327 assert( applicationExpr->get_args().size() == 2 );
328 (*arg++)->accept( *this );
[6c4ff37]329 output << "[";
[51587aa]330 (*arg)->accept( *this );
[6c4ff37]331 output << "]";
[51587aa]332 break;
[71f4e4f]333
[51587aa]334 case OT_CALL:
[356189a]335 // there are no intrinsic definitions of the function call operator
[51587aa]336 assert( false );
337 break;
[71f4e4f]338
[f1e012b]339 case OT_CTOR:
[c2ce2350]340 case OT_DTOR:
[356189a]341 if ( applicationExpr->get_args().size() == 1 ) {
[8e9cbb2]342 // the expression fed into a single parameter constructor or destructor may contain side
343 // effects, so must still output this expression
[64071c2]344 output << "(";
[356189a]345 (*arg++)->accept( *this );
[64071c2]346 output << ") /* " << opInfo.inputName << " */";
[356189a]347 } else if ( applicationExpr->get_args().size() == 2 ) {
[c2ce2350]348 // intrinsic two parameter constructors are essentially bitwise assignment
[356189a]349 output << "(";
350 (*arg++)->accept( *this );
351 output << opInfo.symbol;
352 (*arg)->accept( *this );
[c2ce2350]353 output << ") /* " << opInfo.inputName << " */";
[356189a]354 } else {
[c2ce2350]355 // no constructors with 0 or more than 2 parameters
[356189a]356 assert( false );
[8688ce1]357 } // if
[356189a]358 break;
[f1e012b]359
[51587aa]360 case OT_PREFIX:
361 case OT_PREFIXASSIGN:
362 assert( applicationExpr->get_args().size() == 1 );
[6c4ff37]363 output << "(";
364 output << opInfo.symbol;
[51587aa]365 (*arg)->accept( *this );
[6c4ff37]366 output << ")";
[51587aa]367 break;
[71f4e4f]368
[51587aa]369 case OT_POSTFIX:
370 case OT_POSTFIXASSIGN:
371 assert( applicationExpr->get_args().size() == 1 );
372 (*arg)->accept( *this );
[6c4ff37]373 output << opInfo.symbol;
[51587aa]374 break;
375
[f1e012b]376
[51587aa]377 case OT_INFIX:
378 case OT_INFIXASSIGN:
379 assert( applicationExpr->get_args().size() == 2 );
[6c4ff37]380 output << "(";
[51587aa]381 (*arg++)->accept( *this );
[6c4ff37]382 output << opInfo.symbol;
[51587aa]383 (*arg)->accept( *this );
[6c4ff37]384 output << ")";
[51587aa]385 break;
[71f4e4f]386
[51587aa]387 case OT_CONSTANT:
[721f17a]388 case OT_LABELADDRESS:
389 // there are no intrinsic definitions of 0/1 or label addresses as functions
[51587aa]390 assert( false );
[3778cb2]391 } // switch
[17cd4eb]392 } else {
[51587aa]393 varExpr->accept( *this );
[6c4ff37]394 output << "(";
[51587aa]395 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]396 output << ")";
[17cd4eb]397 } // if
[51587aa]398 } else {
399 applicationExpr->get_function()->accept( *this );
[6c4ff37]400 output << "(";
[51587aa]401 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]402 output << ")";
[51587aa]403 } // if
404 }
[71f4e4f]405
[8688ce1]406 void CodeGenerator::visit( UntypedExpr * untypedExpr ) {
[e04ef3a]407 extension( untypedExpr );
[8688ce1]408 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
[51587aa]409 OperatorInfo opInfo;
410 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
411 std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
412 switch ( opInfo.type ) {
413 case OT_INDEX:
414 assert( untypedExpr->get_args().size() == 2 );
415 (*arg++)->accept( *this );
[6c4ff37]416 output << "[";
[51587aa]417 (*arg)->accept( *this );
[6c4ff37]418 output << "]";
[51587aa]419 break;
[71f4e4f]420
[51587aa]421 case OT_CALL:
[f1e012b]422 assert( false );
423
[c2ce2350]424 case OT_CTOR:
425 case OT_DTOR:
426 if ( untypedExpr->get_args().size() == 1 ) {
[8e9cbb2]427 // the expression fed into a single parameter constructor or destructor may contain side
428 // effects, so must still output this expression
[64071c2]429 output << "(";
[c2ce2350]430 (*arg++)->accept( *this );
[64071c2]431 output << ") /* " << opInfo.inputName << " */";
[c2ce2350]432 } else if ( untypedExpr->get_args().size() == 2 ) {
433 // intrinsic two parameter constructors are essentially bitwise assignment
434 output << "(";
435 (*arg++)->accept( *this );
436 output << opInfo.symbol;
437 (*arg)->accept( *this );
438 output << ") /* " << opInfo.inputName << " */";
439 } else {
440 // no constructors with 0 or more than 2 parameters
441 assert( false );
[3778cb2]442 } // if
[51587aa]443 break;
[71f4e4f]444
[51587aa]445 case OT_PREFIX:
446 case OT_PREFIXASSIGN:
[de62360d]447 case OT_LABELADDRESS:
[51587aa]448 assert( untypedExpr->get_args().size() == 1 );
[6c4ff37]449 output << "(";
450 output << opInfo.symbol;
[51587aa]451 (*arg)->accept( *this );
[6c4ff37]452 output << ")";
[51587aa]453 break;
[71f4e4f]454
[51587aa]455 case OT_POSTFIX:
456 case OT_POSTFIXASSIGN:
457 assert( untypedExpr->get_args().size() == 1 );
458 (*arg)->accept( *this );
[6c4ff37]459 output << opInfo.symbol;
[51587aa]460 break;
[71f4e4f]461
[51587aa]462 case OT_INFIX:
463 case OT_INFIXASSIGN:
464 assert( untypedExpr->get_args().size() == 2 );
[6c4ff37]465 output << "(";
[51587aa]466 (*arg++)->accept( *this );
[6c4ff37]467 output << opInfo.symbol;
[51587aa]468 (*arg)->accept( *this );
[6c4ff37]469 output << ")";
[51587aa]470 break;
[71f4e4f]471
[51587aa]472 case OT_CONSTANT:
473 // there are no intrinsic definitions of 0 or 1 as functions
474 assert( false );
[3778cb2]475 } // switch
[51587aa]476 } else {
[8688ce1]477 if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
[ac911f4]478 assert( untypedExpr->get_args().size() == 2 );
479 (*untypedExpr->get_args().begin())->accept( *this );
480 output << " ... ";
481 (*--untypedExpr->get_args().end())->accept( *this );
[057b34f]482 } else { // builtin routines
483 nameExpr->accept( *this );
484 output << "(";
485 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
486 output << ")";
[66d12f7]487 } // if
[51587aa]488 } // if
489 } else {
490 untypedExpr->get_function()->accept( *this );
[6c4ff37]491 output << "(";
[51587aa]492 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
[6c4ff37]493 output << ")";
[51587aa]494 } // if
495 }
[71f4e4f]496
[064e3ff]497 void CodeGenerator::visit( RangeExpr * rangeExpr ) {
498 rangeExpr->get_low()->accept( *this );
499 output << " ... ";
500 rangeExpr->get_high()->accept( *this );
501 }
502
[8688ce1]503 void CodeGenerator::visit( NameExpr * nameExpr ) {
[e04ef3a]504 extension( nameExpr );
[51587aa]505 OperatorInfo opInfo;
506 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
507 assert( opInfo.type == OT_CONSTANT );
[6c4ff37]508 output << opInfo.symbol;
[51587aa]509 } else {
[6c4ff37]510 output << nameExpr->get_name();
[51587aa]511 } // if
512 }
[71f4e4f]513
[8688ce1]514 void CodeGenerator::visit( AddressExpr * addressExpr ) {
[e04ef3a]515 extension( addressExpr );
[6c4ff37]516 output << "(&";
[51587aa]517 // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
[8688ce1]518 if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
[6c4ff37]519 output << mangleName( variableExpr->get_var() );
[51587aa]520 } else {
521 addressExpr->get_arg()->accept( *this );
522 } // if
[6c4ff37]523 output << ")";
[51587aa]524 }
525
[8688ce1]526 void CodeGenerator::visit( CastExpr * castExpr ) {
[e04ef3a]527 extension( castExpr );
[803deb1]528 output << "(";
529 if ( castExpr->get_results().empty() ) {
530 output << "(void)" ;
531 } else if ( ! castExpr->get_results().front()->get_isLvalue() ) {
532 // at least one result type of cast, but not an lvalue
533 output << "(";
534 output << genType( castExpr->get_results().front(), "" );
[71f4e4f]535 output << ")";
[803deb1]536 } else {
[8e9cbb2]537 // otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
[803deb1]538 // never an lvalue in C
[3778cb2]539 } // if
[803deb1]540 castExpr->get_arg()->accept( *this );
541 output << ")";
[51587aa]542 }
[71f4e4f]543
[8688ce1]544 void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) {
[51587aa]545 assert( false );
546 }
[71f4e4f]547
[8688ce1]548 void CodeGenerator::visit( MemberExpr * memberExpr ) {
[e04ef3a]549 extension( memberExpr );
[51587aa]550 memberExpr->get_aggregate()->accept( *this );
[6c4ff37]551 output << "." << mangleName( memberExpr->get_member() );
[51587aa]552 }
[71f4e4f]553
[8688ce1]554 void CodeGenerator::visit( VariableExpr * variableExpr ) {
[e04ef3a]555 extension( variableExpr );
[51587aa]556 OperatorInfo opInfo;
557 if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
[6c4ff37]558 output << opInfo.symbol;
[51587aa]559 } else {
[6c4ff37]560 output << mangleName( variableExpr->get_var() );
[51587aa]561 } // if
562 }
[71f4e4f]563
[8688ce1]564 void CodeGenerator::visit( ConstantExpr * constantExpr ) {
[51587aa]565 assert( constantExpr->get_constant() );
[e04ef3a]566 extension( constantExpr );
[51587aa]567 constantExpr->get_constant()->accept( *this );
568 }
[71f4e4f]569
[8688ce1]570 void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
[e04ef3a]571 extension( sizeofExpr );
[6c4ff37]572 output << "sizeof(";
[51587aa]573 if ( sizeofExpr->get_isType() ) {
[6c4ff37]574 output << genType( sizeofExpr->get_type(), "" );
[51587aa]575 } else {
576 sizeofExpr->get_expr()->accept( *this );
577 } // if
[6c4ff37]578 output << ")";
[51587aa]579 }
[47534159]580
[8688ce1]581 void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
[47534159]582 // use GCC extension to avoid bumping std to C11
[8e9cbb2]583 extension( alignofExpr );
[47534159]584 output << "__alignof__(";
[25a054f]585 if ( alignofExpr->get_isType() ) {
586 output << genType( alignofExpr->get_type(), "" );
[47534159]587 } else {
[25a054f]588 alignofExpr->get_expr()->accept( *this );
[47534159]589 } // if
590 output << ")";
591 }
[71f4e4f]592
[8688ce1]593 void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
[8e9cbb2]594 assert( false && "UntypedOffsetofExpr should not reach code generation." );
[2a4b088]595 }
596
[8688ce1]597 void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
[25a054f]598 // use GCC builtin
599 output << "__builtin_offsetof(";
600 output << genType( offsetofExpr->get_type(), "" );
[e551c69]601 output << ", " << mangleName( offsetofExpr->get_member() );
[25a054f]602 output << ")";
603 }
[d63eeb0]604
[8688ce1]605 void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
[8e9cbb2]606 assert( false && "OffsetPackExpr should not reach code generation." );
[afc1045]607 }
[70a06f6]608
[8688ce1]609 void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
[e04ef3a]610 extension( logicalExpr );
[6c4ff37]611 output << "(";
[51587aa]612 logicalExpr->get_arg1()->accept( *this );
613 if ( logicalExpr->get_isAnd() ) {
[6c4ff37]614 output << " && ";
[51587aa]615 } else {
[6c4ff37]616 output << " || ";
[51587aa]617 } // if
618 logicalExpr->get_arg2()->accept( *this );
[6c4ff37]619 output << ")";
[51587aa]620 }
[71f4e4f]621
[8688ce1]622 void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
[e04ef3a]623 extension( conditionalExpr );
[6c4ff37]624 output << "(";
[51587aa]625 conditionalExpr->get_arg1()->accept( *this );
[6c4ff37]626 output << " ? ";
[51587aa]627 conditionalExpr->get_arg2()->accept( *this );
[6c4ff37]628 output << " : ";
[51587aa]629 conditionalExpr->get_arg3()->accept( *this );
[6c4ff37]630 output << ")";
[51587aa]631 }
[71f4e4f]632
[8688ce1]633 void CodeGenerator::visit( CommaExpr * commaExpr ) {
[e04ef3a]634 extension( commaExpr );
[6c4ff37]635 output << "(";
[51587aa]636 commaExpr->get_arg1()->accept( *this );
[6c4ff37]637 output << " , ";
[51587aa]638 commaExpr->get_arg2()->accept( *this );
[6c4ff37]639 output << ")";
[51587aa]640 }
[71f4e4f]641
[8688ce1]642 void CodeGenerator::visit( TupleExpr * tupleExpr ) {}
[71f4e4f]643
[8688ce1]644 void CodeGenerator::visit( TypeExpr * typeExpr ) {}
[2b6c1e0]645
[8688ce1]646 void CodeGenerator::visit( AsmExpr * asmExpr ) {
[7f5566b]647 if ( asmExpr->get_inout() ) {
648 output << "[ ";
649 asmExpr->get_inout()->accept( *this );
650 output << " ] ";
651 } // if
652 asmExpr->get_constraint()->accept( *this );
653 output << " ( ";
654 asmExpr->get_operand()->accept( *this );
655 output << " )";
656 }
657
[51587aa]658 //*** Statements
[8688ce1]659 void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
[51587aa]660 std::list<Statement*> ks = compoundStmt->get_kids();
[2b6c1e0]661 output << "{" << endl;
[51587aa]662
[2b6c1e0]663 cur_indent += CodeGenerator::tabsize;
[51587aa]664
[7f5566b]665 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
[cda48b6]666 output << indent << printLabels( (*i)->get_labels() );
[7f5566b]667 (*i)->accept( *this );
[2b6c1e0]668
[6c4ff37]669 output << endl;
[2b6c1e0]670 if ( wantSpacing( *i ) ) {
671 output << endl;
[3778cb2]672 } // if
[8688ce1]673 } // for
[71f4e4f]674 cur_indent -= CodeGenerator::tabsize;
[51587aa]675
[cda48b6]676 output << indent << "}";
[51587aa]677 }
678
[8688ce1]679 void CodeGenerator::visit( ExprStmt * exprStmt ) {
[6c4ff37]680 assert( exprStmt );
[321a2481]681 // cast the top-level expression to void to reduce gcc warnings.
682 Expression * expr = new CastExpr( exprStmt->get_expr() );
683 expr->accept( *this );
684 output << ";";
[51587aa]685 }
686
[8688ce1]687 void CodeGenerator::visit( AsmStmt * asmStmt ) {
[7f5566b]688 output << "asm ";
689 if ( asmStmt->get_voltile() ) output << "volatile ";
690 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
691 output << "( ";
692 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
693 output << " : ";
694 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
695 output << " : ";
696 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
697 output << " : ";
698 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
699 if ( ! asmStmt->get_gotolabels().empty() ) {
700 output << " : ";
701 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
702 output << *begin++;
703 if ( begin == asmStmt->get_gotolabels().end() ) break;
704 output << ", ";
705 } // for
706 } // if
707 output << " );" ;
708 }
709
[8688ce1]710 void CodeGenerator::visit( IfStmt * ifStmt ) {
[7f5566b]711 output << "if ( ";
712 ifStmt->get_condition()->accept( *this );
713 output << " ) ";
[51587aa]714
[7f5566b]715 ifStmt->get_thenPart()->accept( *this );
[51587aa]716
717 if ( ifStmt->get_elsePart() != 0) {
[2b6c1e0]718 output << " else ";
[7f5566b]719 ifStmt->get_elsePart()->accept( *this );
[51587aa]720 } // if
721 }
722
[8688ce1]723 void CodeGenerator::visit( SwitchStmt * switchStmt ) {
[7f5566b]724 output << "switch ( " ;
725 switchStmt->get_condition()->accept( *this );
726 output << " ) ";
[71f4e4f]727
[2b6c1e0]728 output << "{" << std::endl;
[6c4ff37]729 cur_indent += CodeGenerator::tabsize;
[8688ce1]730 acceptAll( switchStmt->get_statements(), *this );
[6c4ff37]731 cur_indent -= CodeGenerator::tabsize;
[cda48b6]732 output << indent << "}";
[51587aa]733 }
734
[8688ce1]735 void CodeGenerator::visit( CaseStmt * caseStmt ) {
[cda48b6]736 output << indent;
[eb3261f]737 if ( caseStmt->isDefault()) {
[2b6c1e0]738 output << "default";
[eb3261f]739 } else {
[2b6c1e0]740 output << "case ";
[7f5566b]741 caseStmt->get_condition()->accept( *this );
[17cd4eb]742 } // if
[6c4ff37]743 output << ":\n";
[71f4e4f]744
[51587aa]745 std::list<Statement *> sts = caseStmt->get_statements();
746
[6c4ff37]747 cur_indent += CodeGenerator::tabsize;
[51587aa]748 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
[cda48b6]749 output << indent << printLabels( (*i)->get_labels() ) ;
[7f5566b]750 (*i)->accept( *this );
[6c4ff37]751 output << endl;
[3778cb2]752 } // for
[6c4ff37]753 cur_indent -= CodeGenerator::tabsize;
[51587aa]754 }
755
[8688ce1]756 void CodeGenerator::visit( BranchStmt * branchStmt ) {
[51587aa]757 switch ( branchStmt->get_type()) {
758 case BranchStmt::Goto:
759 if ( ! branchStmt->get_target().empty() )
[6c4ff37]760 output << "goto " << branchStmt->get_target();
[71f4e4f]761 else {
[51587aa]762 if ( branchStmt->get_computedTarget() != 0 ) {
[6c4ff37]763 output << "goto *";
[51587aa]764 branchStmt->get_computedTarget()->accept( *this );
765 } // if
766 } // if
767 break;
768 case BranchStmt::Break:
[6c4ff37]769 output << "break";
[51587aa]770 break;
771 case BranchStmt::Continue:
[6c4ff37]772 output << "continue";
[51587aa]773 break;
[3778cb2]774 } // switch
[2b6c1e0]775 output << ";";
[51587aa]776 }
777
778
[8688ce1]779 void CodeGenerator::visit( ReturnStmt * returnStmt ) {
[6c4ff37]780 output << "return ";
[4b2589a]781 maybeAccept( returnStmt->get_expr(), *this );
[6c4ff37]782 output << ";";
[51587aa]783 }
784
[8688ce1]785 void CodeGenerator::visit( WhileStmt * whileStmt ) {
[321a2481]786 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]787 output << "do" ;
[321a2481]788 } else {
[6c4ff37]789 output << "while (" ;
[7f5566b]790 whileStmt->get_condition()->accept( *this );
[6c4ff37]791 output << ")";
[51587aa]792 } // if
[2b6c1e0]793 output << " ";
[51587aa]794
[2b6c1e0]795 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
[51587aa]796 whileStmt->get_body()->accept( *this );
797
[cda48b6]798 output << indent;
[51587aa]799
800 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]801 output << " while (" ;
[7f5566b]802 whileStmt->get_condition()->accept( *this );
[6c4ff37]803 output << ");";
[51587aa]804 } // if
805 }
806
[8688ce1]807 void CodeGenerator::visit( ForStmt * forStmt ) {
[8e9cbb2]808 // initialization is always hoisted, so don't bother doing anything with that
[145f1fc]809 output << "for (;";
[51587aa]810
[321a2481]811 if ( forStmt->get_condition() != 0 ) {
[51587aa]812 forStmt->get_condition()->accept( *this );
[3778cb2]813 } // if
[6c4ff37]814 output << ";";
[51587aa]815
[321a2481]816 if ( forStmt->get_increment() != 0 ) {
817 // cast the top-level expression to void to reduce gcc warnings.
818 Expression * expr = new CastExpr( forStmt->get_increment() );
819 expr->accept( *this );
[3778cb2]820 } // if
[2b6c1e0]821 output << ") ";
[51587aa]822
823 if ( forStmt->get_body() != 0 ) {
[2b6c1e0]824 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
[51587aa]825 forStmt->get_body()->accept( *this );
826 } // if
827 }
828
[8688ce1]829 void CodeGenerator::visit( NullStmt * nullStmt ) {
[cda48b6]830 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
[6c4ff37]831 output << "/* null statement */ ;";
[51587aa]832 }
833
[8688ce1]834 void CodeGenerator::visit( DeclStmt * declStmt ) {
[51587aa]835 declStmt->get_decl()->accept( *this );
[71f4e4f]836
[51587aa]837 if ( doSemicolon( declStmt->get_decl() ) ) {
[6c4ff37]838 output << ";";
[51587aa]839 } // if
840 }
841
[8688ce1]842 void CodeGenerator::handleStorageClass( Declaration * decl ) {
[51587aa]843 switch ( decl->get_storageClass() ) {
[68cd1ce]844 case DeclarationNode::Extern:
[6c4ff37]845 output << "extern ";
[51587aa]846 break;
[68cd1ce]847 case DeclarationNode::Static:
[6c4ff37]848 output << "static ";
[51587aa]849 break;
[68cd1ce]850 case DeclarationNode::Auto:
[51587aa]851 // silently drop storage class
852 break;
[68cd1ce]853 case DeclarationNode::Register:
[6c4ff37]854 output << "register ";
[51587aa]855 break;
[68cd1ce]856 case DeclarationNode::Inline:
[de62360d]857 output << "inline ";
[f38c8d9]858 break;
[68cd1ce]859 case DeclarationNode::Fortran:
860 output << "fortran ";
861 break;
862 case DeclarationNode::Noreturn:
863 output << "_Noreturn ";
864 break;
865 case DeclarationNode::Threadlocal:
866 output << "_Thread_local ";
867 break;
868 case DeclarationNode::NoStorageClass:
[f38c8d9]869 break;
[843054c2]870 } // switch
[51587aa]871 }
[51b73452]872} // namespace CodeGen
[51587aa]873
874// Local Variables: //
875// tab-width: 4 //
876// mode: c++ //
877// compile-command: "make install" //
878// End: //
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