source: src/CodeGen/CodeGenerator.cc@ d2ac7d5

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 d2ac7d5 was 066d77a, checked in by Rob Schluntz <rschlunt@…>, 9 years ago

documentation for an assertion
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[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
[066d77a]309 // NOTE: if the assertion starts to trigger, check that the application expr isn't being shared.
310 // Since its arguments are modified here, this assertion most commonly triggers when the application
311 // is visited multiple times.
[8688ce1]312 UntypedExpr * newExpr = new UntypedExpr( new NameExpr( "*?" ) );
[51587aa]313 newExpr->get_args().push_back( *arg );
[906e24d]314 Type * type = InitTweak::getPointerBase( (*arg)->get_result() );
[066d77a]315 assertf( type, "First argument to a derefence must be a pointer. Ensure that expressions are not being shared." );
[906e24d]316 newExpr->set_result( type->clone() );
[51587aa]317 *arg = newExpr;
318 } // if
319 break;
320 }
[71f4e4f]321
[51587aa]322 default:
323 // do nothing
324 ;
[3778cb2]325 } // switch
[71f4e4f]326
[51587aa]327 switch ( opInfo.type ) {
328 case OT_INDEX:
329 assert( applicationExpr->get_args().size() == 2 );
330 (*arg++)->accept( *this );
[6c4ff37]331 output << "[";
[51587aa]332 (*arg)->accept( *this );
[6c4ff37]333 output << "]";
[51587aa]334 break;
[71f4e4f]335
[51587aa]336 case OT_CALL:
[356189a]337 // there are no intrinsic definitions of the function call operator
[51587aa]338 assert( false );
339 break;
[71f4e4f]340
[f1e012b]341 case OT_CTOR:
[c2ce2350]342 case OT_DTOR:
[356189a]343 if ( applicationExpr->get_args().size() == 1 ) {
[8e9cbb2]344 // the expression fed into a single parameter constructor or destructor may contain side
345 // effects, so must still output this expression
[64071c2]346 output << "(";
[356189a]347 (*arg++)->accept( *this );
[64071c2]348 output << ") /* " << opInfo.inputName << " */";
[356189a]349 } else if ( applicationExpr->get_args().size() == 2 ) {
[c2ce2350]350 // intrinsic two parameter constructors are essentially bitwise assignment
[356189a]351 output << "(";
352 (*arg++)->accept( *this );
353 output << opInfo.symbol;
354 (*arg)->accept( *this );
[c2ce2350]355 output << ") /* " << opInfo.inputName << " */";
[356189a]356 } else {
[c2ce2350]357 // no constructors with 0 or more than 2 parameters
[356189a]358 assert( false );
[8688ce1]359 } // if
[356189a]360 break;
[f1e012b]361
[51587aa]362 case OT_PREFIX:
363 case OT_PREFIXASSIGN:
364 assert( applicationExpr->get_args().size() == 1 );
[6c4ff37]365 output << "(";
366 output << opInfo.symbol;
[51587aa]367 (*arg)->accept( *this );
[6c4ff37]368 output << ")";
[51587aa]369 break;
[71f4e4f]370
[51587aa]371 case OT_POSTFIX:
372 case OT_POSTFIXASSIGN:
373 assert( applicationExpr->get_args().size() == 1 );
374 (*arg)->accept( *this );
[6c4ff37]375 output << opInfo.symbol;
[51587aa]376 break;
377
[f1e012b]378
[51587aa]379 case OT_INFIX:
380 case OT_INFIXASSIGN:
381 assert( applicationExpr->get_args().size() == 2 );
[6c4ff37]382 output << "(";
[51587aa]383 (*arg++)->accept( *this );
[6c4ff37]384 output << opInfo.symbol;
[51587aa]385 (*arg)->accept( *this );
[6c4ff37]386 output << ")";
[51587aa]387 break;
[71f4e4f]388
[51587aa]389 case OT_CONSTANT:
[721f17a]390 case OT_LABELADDRESS:
391 // there are no intrinsic definitions of 0/1 or label addresses as functions
[51587aa]392 assert( false );
[3778cb2]393 } // switch
[17cd4eb]394 } else {
[51587aa]395 varExpr->accept( *this );
[6c4ff37]396 output << "(";
[51587aa]397 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]398 output << ")";
[17cd4eb]399 } // if
[51587aa]400 } else {
401 applicationExpr->get_function()->accept( *this );
[6c4ff37]402 output << "(";
[51587aa]403 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]404 output << ")";
[51587aa]405 } // if
406 }
[71f4e4f]407
[8688ce1]408 void CodeGenerator::visit( UntypedExpr * untypedExpr ) {
[e04ef3a]409 extension( untypedExpr );
[8688ce1]410 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
[51587aa]411 OperatorInfo opInfo;
412 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
413 std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
414 switch ( opInfo.type ) {
415 case OT_INDEX:
416 assert( untypedExpr->get_args().size() == 2 );
417 (*arg++)->accept( *this );
[6c4ff37]418 output << "[";
[51587aa]419 (*arg)->accept( *this );
[6c4ff37]420 output << "]";
[51587aa]421 break;
[71f4e4f]422
[51587aa]423 case OT_CALL:
[f1e012b]424 assert( false );
425
[c2ce2350]426 case OT_CTOR:
427 case OT_DTOR:
428 if ( untypedExpr->get_args().size() == 1 ) {
[8e9cbb2]429 // the expression fed into a single parameter constructor or destructor may contain side
430 // effects, so must still output this expression
[64071c2]431 output << "(";
[c2ce2350]432 (*arg++)->accept( *this );
[64071c2]433 output << ") /* " << opInfo.inputName << " */";
[c2ce2350]434 } else if ( untypedExpr->get_args().size() == 2 ) {
435 // intrinsic two parameter constructors are essentially bitwise assignment
436 output << "(";
437 (*arg++)->accept( *this );
438 output << opInfo.symbol;
439 (*arg)->accept( *this );
440 output << ") /* " << opInfo.inputName << " */";
441 } else {
442 // no constructors with 0 or more than 2 parameters
443 assert( false );
[3778cb2]444 } // if
[51587aa]445 break;
[71f4e4f]446
[51587aa]447 case OT_PREFIX:
448 case OT_PREFIXASSIGN:
[de62360d]449 case OT_LABELADDRESS:
[51587aa]450 assert( untypedExpr->get_args().size() == 1 );
[6c4ff37]451 output << "(";
452 output << opInfo.symbol;
[51587aa]453 (*arg)->accept( *this );
[6c4ff37]454 output << ")";
[51587aa]455 break;
[71f4e4f]456
[51587aa]457 case OT_POSTFIX:
458 case OT_POSTFIXASSIGN:
459 assert( untypedExpr->get_args().size() == 1 );
460 (*arg)->accept( *this );
[6c4ff37]461 output << opInfo.symbol;
[51587aa]462 break;
[71f4e4f]463
[51587aa]464 case OT_INFIX:
465 case OT_INFIXASSIGN:
466 assert( untypedExpr->get_args().size() == 2 );
[6c4ff37]467 output << "(";
[51587aa]468 (*arg++)->accept( *this );
[6c4ff37]469 output << opInfo.symbol;
[51587aa]470 (*arg)->accept( *this );
[6c4ff37]471 output << ")";
[51587aa]472 break;
[71f4e4f]473
[51587aa]474 case OT_CONSTANT:
475 // there are no intrinsic definitions of 0 or 1 as functions
476 assert( false );
[3778cb2]477 } // switch
[51587aa]478 } else {
[8688ce1]479 if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
[ac911f4]480 assert( untypedExpr->get_args().size() == 2 );
481 (*untypedExpr->get_args().begin())->accept( *this );
482 output << " ... ";
483 (*--untypedExpr->get_args().end())->accept( *this );
[057b34f]484 } else { // builtin routines
485 nameExpr->accept( *this );
486 output << "(";
487 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
488 output << ")";
[66d12f7]489 } // if
[51587aa]490 } // if
491 } else {
492 untypedExpr->get_function()->accept( *this );
[6c4ff37]493 output << "(";
[51587aa]494 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
[6c4ff37]495 output << ")";
[51587aa]496 } // if
497 }
[71f4e4f]498
[064e3ff]499 void CodeGenerator::visit( RangeExpr * rangeExpr ) {
500 rangeExpr->get_low()->accept( *this );
501 output << " ... ";
502 rangeExpr->get_high()->accept( *this );
503 }
504
[8688ce1]505 void CodeGenerator::visit( NameExpr * nameExpr ) {
[e04ef3a]506 extension( nameExpr );
[51587aa]507 OperatorInfo opInfo;
508 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
509 assert( opInfo.type == OT_CONSTANT );
[6c4ff37]510 output << opInfo.symbol;
[51587aa]511 } else {
[6c4ff37]512 output << nameExpr->get_name();
[51587aa]513 } // if
514 }
[71f4e4f]515
[8688ce1]516 void CodeGenerator::visit( AddressExpr * addressExpr ) {
[e04ef3a]517 extension( addressExpr );
[6c4ff37]518 output << "(&";
[51587aa]519 // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
[8688ce1]520 if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
[6c4ff37]521 output << mangleName( variableExpr->get_var() );
[51587aa]522 } else {
523 addressExpr->get_arg()->accept( *this );
524 } // if
[6c4ff37]525 output << ")";
[51587aa]526 }
527
[8688ce1]528 void CodeGenerator::visit( CastExpr * castExpr ) {
[e04ef3a]529 extension( castExpr );
[803deb1]530 output << "(";
[906e24d]531 if ( castExpr->get_result()->isVoid() ) {
[803deb1]532 output << "(void)" ;
[906e24d]533 } else if ( ! castExpr->get_result()->get_isLvalue() ) {
[803deb1]534 // at least one result type of cast, but not an lvalue
535 output << "(";
[906e24d]536 output << genType( castExpr->get_result(), "" );
[71f4e4f]537 output << ")";
[803deb1]538 } else {
[8e9cbb2]539 // otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
[803deb1]540 // never an lvalue in C
[3778cb2]541 } // if
[803deb1]542 castExpr->get_arg()->accept( *this );
543 output << ")";
[51587aa]544 }
[71f4e4f]545
[8688ce1]546 void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) {
[51587aa]547 assert( false );
548 }
[71f4e4f]549
[8688ce1]550 void CodeGenerator::visit( MemberExpr * memberExpr ) {
[e04ef3a]551 extension( memberExpr );
[51587aa]552 memberExpr->get_aggregate()->accept( *this );
[6c4ff37]553 output << "." << mangleName( memberExpr->get_member() );
[51587aa]554 }
[71f4e4f]555
[8688ce1]556 void CodeGenerator::visit( VariableExpr * variableExpr ) {
[e04ef3a]557 extension( variableExpr );
[51587aa]558 OperatorInfo opInfo;
559 if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
[6c4ff37]560 output << opInfo.symbol;
[51587aa]561 } else {
[6c4ff37]562 output << mangleName( variableExpr->get_var() );
[51587aa]563 } // if
564 }
[71f4e4f]565
[8688ce1]566 void CodeGenerator::visit( ConstantExpr * constantExpr ) {
[51587aa]567 assert( constantExpr->get_constant() );
[e04ef3a]568 extension( constantExpr );
[51587aa]569 constantExpr->get_constant()->accept( *this );
570 }
[71f4e4f]571
[8688ce1]572 void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
[e04ef3a]573 extension( sizeofExpr );
[6c4ff37]574 output << "sizeof(";
[51587aa]575 if ( sizeofExpr->get_isType() ) {
[6c4ff37]576 output << genType( sizeofExpr->get_type(), "" );
[51587aa]577 } else {
578 sizeofExpr->get_expr()->accept( *this );
579 } // if
[6c4ff37]580 output << ")";
[51587aa]581 }
[47534159]582
[8688ce1]583 void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
[47534159]584 // use GCC extension to avoid bumping std to C11
[8e9cbb2]585 extension( alignofExpr );
[47534159]586 output << "__alignof__(";
[25a054f]587 if ( alignofExpr->get_isType() ) {
588 output << genType( alignofExpr->get_type(), "" );
[47534159]589 } else {
[25a054f]590 alignofExpr->get_expr()->accept( *this );
[47534159]591 } // if
592 output << ")";
593 }
[71f4e4f]594
[8688ce1]595 void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
[8e9cbb2]596 assert( false && "UntypedOffsetofExpr should not reach code generation." );
[2a4b088]597 }
598
[8688ce1]599 void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
[25a054f]600 // use GCC builtin
601 output << "__builtin_offsetof(";
602 output << genType( offsetofExpr->get_type(), "" );
[e551c69]603 output << ", " << mangleName( offsetofExpr->get_member() );
[25a054f]604 output << ")";
605 }
[d63eeb0]606
[8688ce1]607 void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
[8e9cbb2]608 assert( false && "OffsetPackExpr should not reach code generation." );
[afc1045]609 }
[70a06f6]610
[8688ce1]611 void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
[e04ef3a]612 extension( logicalExpr );
[6c4ff37]613 output << "(";
[51587aa]614 logicalExpr->get_arg1()->accept( *this );
615 if ( logicalExpr->get_isAnd() ) {
[6c4ff37]616 output << " && ";
[51587aa]617 } else {
[6c4ff37]618 output << " || ";
[51587aa]619 } // if
620 logicalExpr->get_arg2()->accept( *this );
[6c4ff37]621 output << ")";
[51587aa]622 }
[71f4e4f]623
[8688ce1]624 void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
[e04ef3a]625 extension( conditionalExpr );
[6c4ff37]626 output << "(";
[51587aa]627 conditionalExpr->get_arg1()->accept( *this );
[6c4ff37]628 output << " ? ";
[51587aa]629 conditionalExpr->get_arg2()->accept( *this );
[6c4ff37]630 output << " : ";
[51587aa]631 conditionalExpr->get_arg3()->accept( *this );
[6c4ff37]632 output << ")";
[51587aa]633 }
[71f4e4f]634
[8688ce1]635 void CodeGenerator::visit( CommaExpr * commaExpr ) {
[e04ef3a]636 extension( commaExpr );
[6c4ff37]637 output << "(";
[51587aa]638 commaExpr->get_arg1()->accept( *this );
[6c4ff37]639 output << " , ";
[51587aa]640 commaExpr->get_arg2()->accept( *this );
[6c4ff37]641 output << ")";
[51587aa]642 }
[71f4e4f]643
[3c13c03]644 void CodeGenerator::visit( TupleExpr * tupleExpr ) { assert( false ); }
[71f4e4f]645
[8688ce1]646 void CodeGenerator::visit( TypeExpr * typeExpr ) {}
[2b6c1e0]647
[8688ce1]648 void CodeGenerator::visit( AsmExpr * asmExpr ) {
[7f5566b]649 if ( asmExpr->get_inout() ) {
650 output << "[ ";
651 asmExpr->get_inout()->accept( *this );
652 output << " ] ";
653 } // if
654 asmExpr->get_constraint()->accept( *this );
655 output << " ( ";
656 asmExpr->get_operand()->accept( *this );
657 output << " )";
658 }
659
[3c13c03]660 void CodeGenerator::visit( CompoundLiteralExpr *compLitExpr ) {
661 assert( compLitExpr->get_type() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
662 output << "(" << genType( compLitExpr->get_type(), "" ) << ")";
663 compLitExpr->get_initializer()->accept( *this );
664 }
665
[6eb8948]666 void CodeGenerator::visit( StmtExpr * stmtExpr ) {
[3c13c03]667 std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
668 output << "({" << std::endl;
669 cur_indent += CodeGenerator::tabsize;
670 unsigned int numStmts = stmts.size();
671 unsigned int i = 0;
672 for ( Statement * stmt : stmts ) {
673 output << indent << printLabels( stmt->get_labels() );
674 if ( i+1 == numStmts ) {
675 // last statement in a statement expression needs to be handled specially -
676 // cannot cast to void, otherwise the expression statement has no value
677 if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
678 exprStmt->get_expr()->accept( *this );
679 output << ";" << endl;
680 ++i;
681 break;
682 }
683 }
684 stmt->accept( *this );
685 output << endl;
686 if ( wantSpacing( stmt ) ) {
687 output << endl;
688 } // if
689 ++i;
690 }
691 cur_indent -= CodeGenerator::tabsize;
692 output << indent << "})";
[6eb8948]693 }
694
[51587aa]695 //*** Statements
[8688ce1]696 void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
[51587aa]697 std::list<Statement*> ks = compoundStmt->get_kids();
[2b6c1e0]698 output << "{" << endl;
[51587aa]699
[2b6c1e0]700 cur_indent += CodeGenerator::tabsize;
[51587aa]701
[7f5566b]702 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
[cda48b6]703 output << indent << printLabels( (*i)->get_labels() );
[7f5566b]704 (*i)->accept( *this );
[2b6c1e0]705
[6c4ff37]706 output << endl;
[2b6c1e0]707 if ( wantSpacing( *i ) ) {
708 output << endl;
[3778cb2]709 } // if
[8688ce1]710 } // for
[71f4e4f]711 cur_indent -= CodeGenerator::tabsize;
[51587aa]712
[cda48b6]713 output << indent << "}";
[51587aa]714 }
715
[8688ce1]716 void CodeGenerator::visit( ExprStmt * exprStmt ) {
[6c4ff37]717 assert( exprStmt );
[321a2481]718 // cast the top-level expression to void to reduce gcc warnings.
719 Expression * expr = new CastExpr( exprStmt->get_expr() );
720 expr->accept( *this );
721 output << ";";
[51587aa]722 }
723
[8688ce1]724 void CodeGenerator::visit( AsmStmt * asmStmt ) {
[7f5566b]725 output << "asm ";
726 if ( asmStmt->get_voltile() ) output << "volatile ";
727 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
728 output << "( ";
729 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
730 output << " : ";
731 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
732 output << " : ";
733 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
734 output << " : ";
735 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
736 if ( ! asmStmt->get_gotolabels().empty() ) {
737 output << " : ";
738 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
739 output << *begin++;
740 if ( begin == asmStmt->get_gotolabels().end() ) break;
741 output << ", ";
742 } // for
743 } // if
744 output << " );" ;
745 }
746
[8688ce1]747 void CodeGenerator::visit( IfStmt * ifStmt ) {
[7f5566b]748 output << "if ( ";
749 ifStmt->get_condition()->accept( *this );
750 output << " ) ";
[51587aa]751
[7f5566b]752 ifStmt->get_thenPart()->accept( *this );
[51587aa]753
754 if ( ifStmt->get_elsePart() != 0) {
[2b6c1e0]755 output << " else ";
[7f5566b]756 ifStmt->get_elsePart()->accept( *this );
[51587aa]757 } // if
758 }
759
[8688ce1]760 void CodeGenerator::visit( SwitchStmt * switchStmt ) {
[7f5566b]761 output << "switch ( " ;
762 switchStmt->get_condition()->accept( *this );
763 output << " ) ";
[71f4e4f]764
[2b6c1e0]765 output << "{" << std::endl;
[6c4ff37]766 cur_indent += CodeGenerator::tabsize;
[8688ce1]767 acceptAll( switchStmt->get_statements(), *this );
[6c4ff37]768 cur_indent -= CodeGenerator::tabsize;
[cda48b6]769 output << indent << "}";
[51587aa]770 }
771
[8688ce1]772 void CodeGenerator::visit( CaseStmt * caseStmt ) {
[cda48b6]773 output << indent;
[eb3261f]774 if ( caseStmt->isDefault()) {
[2b6c1e0]775 output << "default";
[eb3261f]776 } else {
[2b6c1e0]777 output << "case ";
[7f5566b]778 caseStmt->get_condition()->accept( *this );
[17cd4eb]779 } // if
[6c4ff37]780 output << ":\n";
[71f4e4f]781
[51587aa]782 std::list<Statement *> sts = caseStmt->get_statements();
783
[6c4ff37]784 cur_indent += CodeGenerator::tabsize;
[51587aa]785 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
[cda48b6]786 output << indent << printLabels( (*i)->get_labels() ) ;
[7f5566b]787 (*i)->accept( *this );
[6c4ff37]788 output << endl;
[3778cb2]789 } // for
[6c4ff37]790 cur_indent -= CodeGenerator::tabsize;
[51587aa]791 }
792
[8688ce1]793 void CodeGenerator::visit( BranchStmt * branchStmt ) {
[51587aa]794 switch ( branchStmt->get_type()) {
795 case BranchStmt::Goto:
796 if ( ! branchStmt->get_target().empty() )
[6c4ff37]797 output << "goto " << branchStmt->get_target();
[71f4e4f]798 else {
[51587aa]799 if ( branchStmt->get_computedTarget() != 0 ) {
[6c4ff37]800 output << "goto *";
[51587aa]801 branchStmt->get_computedTarget()->accept( *this );
802 } // if
803 } // if
804 break;
805 case BranchStmt::Break:
[6c4ff37]806 output << "break";
[51587aa]807 break;
808 case BranchStmt::Continue:
[6c4ff37]809 output << "continue";
[51587aa]810 break;
[3778cb2]811 } // switch
[2b6c1e0]812 output << ";";
[51587aa]813 }
814
815
[8688ce1]816 void CodeGenerator::visit( ReturnStmt * returnStmt ) {
[6c4ff37]817 output << "return ";
[4b2589a]818 maybeAccept( returnStmt->get_expr(), *this );
[6c4ff37]819 output << ";";
[51587aa]820 }
821
[8688ce1]822 void CodeGenerator::visit( WhileStmt * whileStmt ) {
[321a2481]823 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]824 output << "do" ;
[321a2481]825 } else {
[6c4ff37]826 output << "while (" ;
[7f5566b]827 whileStmt->get_condition()->accept( *this );
[6c4ff37]828 output << ")";
[51587aa]829 } // if
[2b6c1e0]830 output << " ";
[51587aa]831
[2b6c1e0]832 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
[51587aa]833 whileStmt->get_body()->accept( *this );
834
[cda48b6]835 output << indent;
[51587aa]836
837 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]838 output << " while (" ;
[7f5566b]839 whileStmt->get_condition()->accept( *this );
[6c4ff37]840 output << ");";
[51587aa]841 } // if
842 }
843
[8688ce1]844 void CodeGenerator::visit( ForStmt * forStmt ) {
[8e9cbb2]845 // initialization is always hoisted, so don't bother doing anything with that
[145f1fc]846 output << "for (;";
[51587aa]847
[321a2481]848 if ( forStmt->get_condition() != 0 ) {
[51587aa]849 forStmt->get_condition()->accept( *this );
[3778cb2]850 } // if
[6c4ff37]851 output << ";";
[51587aa]852
[321a2481]853 if ( forStmt->get_increment() != 0 ) {
854 // cast the top-level expression to void to reduce gcc warnings.
855 Expression * expr = new CastExpr( forStmt->get_increment() );
856 expr->accept( *this );
[3778cb2]857 } // if
[2b6c1e0]858 output << ") ";
[51587aa]859
860 if ( forStmt->get_body() != 0 ) {
[2b6c1e0]861 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
[51587aa]862 forStmt->get_body()->accept( *this );
863 } // if
864 }
865
[8688ce1]866 void CodeGenerator::visit( NullStmt * nullStmt ) {
[cda48b6]867 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
[6c4ff37]868 output << "/* null statement */ ;";
[51587aa]869 }
870
[8688ce1]871 void CodeGenerator::visit( DeclStmt * declStmt ) {
[51587aa]872 declStmt->get_decl()->accept( *this );
[71f4e4f]873
[51587aa]874 if ( doSemicolon( declStmt->get_decl() ) ) {
[6c4ff37]875 output << ";";
[51587aa]876 } // if
877 }
878
[8688ce1]879 void CodeGenerator::handleStorageClass( Declaration * decl ) {
[51587aa]880 switch ( decl->get_storageClass() ) {
[68cd1ce]881 case DeclarationNode::Extern:
[6c4ff37]882 output << "extern ";
[51587aa]883 break;
[68cd1ce]884 case DeclarationNode::Static:
[6c4ff37]885 output << "static ";
[51587aa]886 break;
[68cd1ce]887 case DeclarationNode::Auto:
[51587aa]888 // silently drop storage class
889 break;
[68cd1ce]890 case DeclarationNode::Register:
[6c4ff37]891 output << "register ";
[51587aa]892 break;
[68cd1ce]893 case DeclarationNode::Inline:
[de62360d]894 output << "inline ";
[f38c8d9]895 break;
[68cd1ce]896 case DeclarationNode::Fortran:
897 output << "fortran ";
898 break;
899 case DeclarationNode::Noreturn:
900 output << "_Noreturn ";
901 break;
902 case DeclarationNode::Threadlocal:
903 output << "_Thread_local ";
904 break;
905 case DeclarationNode::NoStorageClass:
[f38c8d9]906 break;
[843054c2]907 } // switch
[51587aa]908 }
[51b73452]909} // namespace CodeGen
[51587aa]910
911// Local Variables: //
912// tab-width: 4 //
913// mode: c++ //
914// compile-command: "make install" //
915// End: //
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