source: src/CodeGen/CodeGenerator.cc@ a62cbb3

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 a62cbb3 was 3a5131ed, checked in by Peter A. Buhr <pabuhr@…>, 9 years ago

handle KR function declarations
  • Property mode set to 100644
File size: 28.0 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
[3a5131ed]12// Last Modified On : Thu Feb 16 14:56:29 2017
13// Update Count : 418
[51587aa]14//
15
[51b73452]16#include <algorithm>
17#include <iostream>
18#include <cassert>
19#include <list>
20
[68cd1ce]21#include "Parser/ParseNode.h"
22
[e8032b0]23#include "SynTree/Declaration.h"
[51b73452]24#include "SynTree/Expression.h"
25#include "SynTree/Initializer.h"
[68cd1ce]26#include "SynTree/Statement.h"
[e8032b0]27#include "SynTree/Type.h"
[7baed7d]28#include "SynTree/Attribute.h"
[51b73452]29
[d3b7937]30#include "Common/utility.h"
31#include "Common/UnimplementedError.h"
[51b73452]32
[a61fea9a]33#include "CodeGenerator.h"
[51b73452]34#include "OperatorTable.h"
35#include "GenType.h"
36
[10a7775]37#include "InitTweak/InitTweak.h"
38
[51b73452]39using namespace std;
40
41namespace CodeGen {
[6c4ff37]42 int CodeGenerator::tabsize = 4;
[51587aa]43
[145f1fc]44 // the kinds of statements that would ideally be followed by whitespace
[2b6c1e0]45 bool wantSpacing( Statement * stmt) {
46 return dynamic_cast< IfStmt * >( stmt ) || dynamic_cast< CompoundStmt * >( stmt ) ||
[08061589]47 dynamic_cast< WhileStmt * >( stmt ) || dynamic_cast< ForStmt * >( stmt ) || dynamic_cast< SwitchStmt *>( stmt );
[2b6c1e0]48 }
49
[8688ce1]50 void CodeGenerator::extension( Expression * expr ) {
[8e9cbb2]51 if ( expr->get_extension() ) {
52 output << "__extension__ ";
53 } // if
54 } // extension
55
[8688ce1]56 void CodeGenerator::extension( Declaration * decl ) {
[8e9cbb2]57 if ( decl->get_extension() ) {
58 output << "__extension__ ";
59 } // if
60 } // extension
61
[58dd019]62 void CodeGenerator::asmName( DeclarationWithType * decl ) {
63 if ( ConstantExpr * asmName = decl->get_asmName() ) {
64 output << " asm ( " << asmName->get_constant()->get_value() << " )";
65 } // if
66 } // extension
67
[888cbe4]68 ostream & CodeGenerator::Indenter::operator()( ostream & output ) const {
[cda48b6]69 return output << string( cg.cur_indent, ' ' );
70 }
71
[888cbe4]72 ostream & operator<<( ostream & output, const CodeGenerator::Indenter &indent ) {
[cda48b6]73 return indent( output );
74 }
[51587aa]75
[888cbe4]76 CodeGenerator::LabelPrinter & CodeGenerator::LabelPrinter::operator()( std::list< Label > & l ) {
77 labels = &l;
78 return *this;
79 }
80
[8688ce1]81 ostream & operator<<( ostream & output, CodeGenerator::LabelPrinter & printLabels ) {
[888cbe4]82 std::list< Label > & labs = *printLabels.labels;
83 // l.unique(); // assumes a sorted list. Why not use set? Does order matter?
84 for ( Label & l : labs ) {
85 output << l.get_name() + ": ";
86 printLabels.cg.genAttributes( l.get_attributes() );
[8688ce1]87 } // for
[888cbe4]88 return output;
89 }
90
[35b1bf4]91 CodeGenerator::CodeGenerator( std::ostream & os, bool pretty ) : indent( *this), cur_indent( 0 ), insideFunction( false ), output( os ), printLabels( *this ), pretty( pretty ) {}
[cda48b6]92
[8688ce1]93 CodeGenerator::CodeGenerator( std::ostream & os, std::string init, int indentation, bool infunp )
[888cbe4]94 : indent( *this), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( *this ) {
[6c4ff37]95 //output << std::string( init );
[51587aa]96 }
97
[8688ce1]98 CodeGenerator::CodeGenerator( std::ostream & os, char * init, int indentation, bool infunp )
[888cbe4]99 : indent( *this ), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( *this ) {
[6c4ff37]100 //output << std::string( init );
[51587aa]101 }
102
[486341f]103 string CodeGenerator::mangleName( DeclarationWithType * decl ) {
[35b1bf4]104 if ( pretty ) return decl->get_name();
[51587aa]105 if ( decl->get_mangleName() != "" ) {
[f326f99]106 // need to incorporate scope level in order to differentiate names for destructors
107 return decl->get_scopedMangleName();
[51587aa]108 } else {
109 return decl->get_name();
110 } // if
111 }
[94b4364]112
[44a81853]113 void CodeGenerator::genAttributes( list< Attribute * > & attributes ) {
114 if ( attributes.empty() ) return;
115 output << "__attribute__ ((";
116 for ( list< Attribute * >::iterator attr( attributes.begin() );; ) {
117 output << (*attr)->get_name();
118 if ( ! (*attr)->get_parameters().empty() ) {
119 output << "(";
120 genCommaList( (*attr)->get_parameters().begin(), (*attr)->get_parameters().end() );
121 output << ")";
122 } // if
123 if ( ++attr == attributes.end() ) break;
124 output << ","; // separator
125 } // for
126 output << ")) ";
127 } // CodeGenerator::genAttributes
[7baed7d]128
129
130 //*** Declarations
[8688ce1]131 void CodeGenerator::visit( FunctionDecl * functionDecl ) {
[8e9cbb2]132 extension( functionDecl );
[7baed7d]133 genAttributes( functionDecl->get_attributes() );
134
[51587aa]135 handleStorageClass( functionDecl );
[f38c8d9]136 if ( functionDecl->get_isInline() ) {
[6c4ff37]137 output << "inline ";
[f38c8d9]138 } // if
[de62360d]139 if ( functionDecl->get_isNoreturn() ) {
140 output << "_Noreturn ";
141 } // if
[35b1bf4]142 output << genType( functionDecl->get_functionType(), mangleName( functionDecl ), pretty );
[51587aa]143
[58dd019]144 asmName( functionDecl );
145
[51587aa]146 // acceptAll( functionDecl->get_oldDecls(), *this );
147 if ( functionDecl->get_statements() ) {
[7f5566b]148 functionDecl->get_statements()->accept( *this );
[51587aa]149 } // if
150 }
151
[8688ce1]152 void CodeGenerator::visit( ObjectDecl * objectDecl ) {
[8e9cbb2]153 extension( objectDecl );
[f9cebb5]154 genAttributes( objectDecl->get_attributes() );
155
[51587aa]156 handleStorageClass( objectDecl );
[35b1bf4]157 output << genType( objectDecl->get_type(), mangleName( objectDecl ), pretty );
[71f4e4f]158
[58dd019]159 asmName( objectDecl );
160
[51587aa]161 if ( objectDecl->get_init() ) {
[6c4ff37]162 output << " = ";
[51587aa]163 objectDecl->get_init()->accept( *this );
164 } // if
[3778cb2]165
[51587aa]166 if ( objectDecl->get_bitfieldWidth() ) {
[6c4ff37]167 output << ":";
[51587aa]168 objectDecl->get_bitfieldWidth()->accept( *this );
169 } // if
170 }
171
[8688ce1]172 void CodeGenerator::handleAggregate( AggregateDecl * aggDecl ) {
[c0aa336]173 genAttributes( aggDecl->get_attributes() );
[35b1bf4]174
[51587aa]175 if ( aggDecl->get_name() != "" )
[6c4ff37]176 output << aggDecl->get_name();
[71f4e4f]177
[2c57025]178 // std::list< Declaration * > & memb = aggDecl->get_members();
179 // if ( ! memb.empty() ) {
180 if ( aggDecl->has_body() ) {
181 std::list< Declaration * > & memb = aggDecl->get_members();
[94b4364]182 output << " {" << endl;
[51587aa]183
[71f4e4f]184 cur_indent += CodeGenerator::tabsize;
[3778cb2]185 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
[71f4e4f]186 output << indent;
[7f5566b]187 (*i)->accept( *this );
[6c4ff37]188 output << ";" << endl;
[3778cb2]189 } // for
[51587aa]190
[71f4e4f]191 cur_indent -= CodeGenerator::tabsize;
[51587aa]192
[cda48b6]193 output << indent << "}";
[17cd4eb]194 } // if
[51587aa]195 }
[17cd4eb]196
[8688ce1]197 void CodeGenerator::visit( StructDecl * structDecl ) {
[8e9cbb2]198 extension( structDecl );
[6c4ff37]199 output << "struct ";
[51587aa]200 handleAggregate( structDecl );
201 }
[17cd4eb]202
[8688ce1]203 void CodeGenerator::visit( UnionDecl * unionDecl ) {
[8e9cbb2]204 extension( unionDecl );
[6c4ff37]205 output << "union ";
[8e9cbb2]206 handleAggregate( unionDecl );
[51587aa]207 }
[71f4e4f]208
[8688ce1]209 void CodeGenerator::visit( EnumDecl * enumDecl ) {
[8e9cbb2]210 extension( enumDecl );
[6c4ff37]211 output << "enum ";
[c0aa336]212 genAttributes( enumDecl->get_attributes() );
[51587aa]213
[8e9cbb2]214 if ( enumDecl->get_name() != "" )
215 output << enumDecl->get_name();
[71f4e4f]216
[8e9cbb2]217 std::list< Declaration* > &memb = enumDecl->get_members();
[51587aa]218
219 if ( ! memb.empty() ) {
[cda48b6]220 output << " {" << endl;
[51587aa]221
[71f4e4f]222 cur_indent += CodeGenerator::tabsize;
[51587aa]223 for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
[8688ce1]224 ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
[51587aa]225 assert( obj );
[71f4e4f]226 output << indent << mangleName( obj );
[51587aa]227 if ( obj->get_init() ) {
[6c4ff37]228 output << " = ";
[7f5566b]229 obj->get_init()->accept( *this );
[51587aa]230 } // if
[6c4ff37]231 output << "," << endl;
[51587aa]232 } // for
233
[71f4e4f]234 cur_indent -= CodeGenerator::tabsize;
[51587aa]235
[cda48b6]236 output << indent << "}";
[51587aa]237 } // if
238 }
[71f4e4f]239
[8688ce1]240 void CodeGenerator::visit( TraitDecl * traitDecl ) {}
[71f4e4f]241
[8688ce1]242 void CodeGenerator::visit( TypedefDecl * typeDecl ) {
[8e9cbb2]243 assert( false && "Typedefs are removed and substituted in earlier passes." );
244 //output << "typedef ";
[35b1bf4]245 //output << genType( typeDecl->get_base(), typeDecl->get_name(), pretty );
[51587aa]246 }
[71f4e4f]247
[8688ce1]248 void CodeGenerator::visit( TypeDecl * typeDecl ) {
[51587aa]249 // really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
250 // still to be done
[8e9cbb2]251 extension( typeDecl );
[6c4ff37]252 output << "extern unsigned long " << typeDecl->get_name();
[51587aa]253 if ( typeDecl->get_base() ) {
[35b1bf4]254 output << " = sizeof( " << genType( typeDecl->get_base(), "", pretty ) << " )";
[51587aa]255 } // if
256 }
257
[e45215c]258 void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
259 typedef std::list< Expression * > DesignatorList;
260 if ( designators.size() == 0 ) return;
261 for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
[8a4da06]262 if ( dynamic_cast< NameExpr * >( *iter ) ) {
[f32c7f4]263 // if expression is a name, then initializing aggregate member
264 output << ".";
265 (*iter)->accept( *this );
266 } else {
267 // if not a simple name, it has to be a constant expression, i.e. an array designator
[e45215c]268 output << "[";
269 (*iter)->accept( *this );
270 output << "]";
[3778cb2]271 } // if
272 } // for
[e45215c]273 output << " = ";
274 }
275
[8688ce1]276 void CodeGenerator::visit( SingleInit * init ) {
[e45215c]277 printDesignators( init->get_designators() );
[51587aa]278 init->get_value()->accept( *this );
279 }
280
[8688ce1]281 void CodeGenerator::visit( ListInit * init ) {
[e45215c]282 printDesignators( init->get_designators() );
[6c4ff37]283 output << "{ ";
[4d2434a]284 if ( init->begin() == init->end() ) {
[8e9cbb2]285 // illegal to leave initializer list empty for scalar initializers, but always legal to have 0
[5b40f30]286 output << "0";
287 } else {
[4d2434a]288 genCommaList( init->begin(), init->end() );
[8688ce1]289 } // if
[6c4ff37]290 output << " }";
[51587aa]291 }
292
[fc638d2]293 void CodeGenerator::visit( ConstructorInit * init ){
294 assertf( false, "ConstructorInit nodes should not make it to CodeGen." );
295 }
296
[8688ce1]297 void CodeGenerator::visit( Constant * constant ) {
[6c4ff37]298 output << constant->get_value() ;
[51587aa]299 }
300
301 //*** Expressions
[8688ce1]302 void CodeGenerator::visit( ApplicationExpr * applicationExpr ) {
[e04ef3a]303 extension( applicationExpr );
[8688ce1]304 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
[51587aa]305 OperatorInfo opInfo;
306 if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
307 std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
308 switch ( opInfo.type ) {
309 case OT_PREFIXASSIGN:
310 case OT_POSTFIXASSIGN:
311 case OT_INFIXASSIGN:
[356189a]312 case OT_CTOR:
[c2ce2350]313 case OT_DTOR:
[51587aa]314 {
315 assert( arg != applicationExpr->get_args().end() );
[8688ce1]316 if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) {
[356189a]317 // remove & from first assignment/ctor argument
[51587aa]318 *arg = addrExpr->get_arg();
319 } else {
[356189a]320 // no address-of operator, so must be a pointer - add dereference
[066d77a]321 // NOTE: if the assertion starts to trigger, check that the application expr isn't being shared.
322 // Since its arguments are modified here, this assertion most commonly triggers when the application
323 // is visited multiple times.
[8688ce1]324 UntypedExpr * newExpr = new UntypedExpr( new NameExpr( "*?" ) );
[51587aa]325 newExpr->get_args().push_back( *arg );
[906e24d]326 Type * type = InitTweak::getPointerBase( (*arg)->get_result() );
[066d77a]327 assertf( type, "First argument to a derefence must be a pointer. Ensure that expressions are not being shared." );
[906e24d]328 newExpr->set_result( type->clone() );
[51587aa]329 *arg = newExpr;
330 } // if
331 break;
332 }
[71f4e4f]333
[51587aa]334 default:
335 // do nothing
336 ;
[3778cb2]337 } // switch
[71f4e4f]338
[51587aa]339 switch ( opInfo.type ) {
340 case OT_INDEX:
341 assert( applicationExpr->get_args().size() == 2 );
342 (*arg++)->accept( *this );
[6c4ff37]343 output << "[";
[51587aa]344 (*arg)->accept( *this );
[6c4ff37]345 output << "]";
[51587aa]346 break;
[71f4e4f]347
[51587aa]348 case OT_CALL:
[356189a]349 // there are no intrinsic definitions of the function call operator
[51587aa]350 assert( false );
351 break;
[71f4e4f]352
[f1e012b]353 case OT_CTOR:
[c2ce2350]354 case OT_DTOR:
[356189a]355 if ( applicationExpr->get_args().size() == 1 ) {
[8e9cbb2]356 // the expression fed into a single parameter constructor or destructor may contain side
357 // effects, so must still output this expression
[64071c2]358 output << "(";
[356189a]359 (*arg++)->accept( *this );
[64071c2]360 output << ") /* " << opInfo.inputName << " */";
[356189a]361 } else if ( applicationExpr->get_args().size() == 2 ) {
[c2ce2350]362 // intrinsic two parameter constructors are essentially bitwise assignment
[356189a]363 output << "(";
364 (*arg++)->accept( *this );
365 output << opInfo.symbol;
366 (*arg)->accept( *this );
[c2ce2350]367 output << ") /* " << opInfo.inputName << " */";
[356189a]368 } else {
[c2ce2350]369 // no constructors with 0 or more than 2 parameters
[356189a]370 assert( false );
[8688ce1]371 } // if
[356189a]372 break;
[f1e012b]373
[51587aa]374 case OT_PREFIX:
375 case OT_PREFIXASSIGN:
376 assert( applicationExpr->get_args().size() == 1 );
[6c4ff37]377 output << "(";
378 output << opInfo.symbol;
[51587aa]379 (*arg)->accept( *this );
[6c4ff37]380 output << ")";
[51587aa]381 break;
[71f4e4f]382
[51587aa]383 case OT_POSTFIX:
384 case OT_POSTFIXASSIGN:
385 assert( applicationExpr->get_args().size() == 1 );
386 (*arg)->accept( *this );
[6c4ff37]387 output << opInfo.symbol;
[51587aa]388 break;
389
[f1e012b]390
[51587aa]391 case OT_INFIX:
392 case OT_INFIXASSIGN:
393 assert( applicationExpr->get_args().size() == 2 );
[6c4ff37]394 output << "(";
[51587aa]395 (*arg++)->accept( *this );
[6c4ff37]396 output << opInfo.symbol;
[51587aa]397 (*arg)->accept( *this );
[6c4ff37]398 output << ")";
[51587aa]399 break;
[71f4e4f]400
[51587aa]401 case OT_CONSTANT:
[721f17a]402 case OT_LABELADDRESS:
403 // there are no intrinsic definitions of 0/1 or label addresses as functions
[51587aa]404 assert( false );
[3778cb2]405 } // switch
[17cd4eb]406 } else {
[51587aa]407 varExpr->accept( *this );
[6c4ff37]408 output << "(";
[51587aa]409 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]410 output << ")";
[17cd4eb]411 } // if
[51587aa]412 } else {
413 applicationExpr->get_function()->accept( *this );
[6c4ff37]414 output << "(";
[51587aa]415 genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]416 output << ")";
[51587aa]417 } // if
418 }
[71f4e4f]419
[8688ce1]420 void CodeGenerator::visit( UntypedExpr * untypedExpr ) {
[e04ef3a]421 extension( untypedExpr );
[8688ce1]422 if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
[51587aa]423 OperatorInfo opInfo;
424 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
425 std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
426 switch ( opInfo.type ) {
427 case OT_INDEX:
428 assert( untypedExpr->get_args().size() == 2 );
429 (*arg++)->accept( *this );
[6c4ff37]430 output << "[";
[51587aa]431 (*arg)->accept( *this );
[6c4ff37]432 output << "]";
[51587aa]433 break;
[71f4e4f]434
[51587aa]435 case OT_CALL:
[f1e012b]436 assert( false );
437
[c2ce2350]438 case OT_CTOR:
439 case OT_DTOR:
440 if ( untypedExpr->get_args().size() == 1 ) {
[8e9cbb2]441 // the expression fed into a single parameter constructor or destructor may contain side
442 // effects, so must still output this expression
[64071c2]443 output << "(";
[c2ce2350]444 (*arg++)->accept( *this );
[64071c2]445 output << ") /* " << opInfo.inputName << " */";
[c2ce2350]446 } else if ( untypedExpr->get_args().size() == 2 ) {
447 // intrinsic two parameter constructors are essentially bitwise assignment
448 output << "(";
449 (*arg++)->accept( *this );
450 output << opInfo.symbol;
451 (*arg)->accept( *this );
452 output << ") /* " << opInfo.inputName << " */";
453 } else {
454 // no constructors with 0 or more than 2 parameters
455 assert( false );
[3778cb2]456 } // if
[51587aa]457 break;
[71f4e4f]458
[51587aa]459 case OT_PREFIX:
460 case OT_PREFIXASSIGN:
[de62360d]461 case OT_LABELADDRESS:
[51587aa]462 assert( untypedExpr->get_args().size() == 1 );
[6c4ff37]463 output << "(";
464 output << opInfo.symbol;
[51587aa]465 (*arg)->accept( *this );
[6c4ff37]466 output << ")";
[51587aa]467 break;
[71f4e4f]468
[51587aa]469 case OT_POSTFIX:
470 case OT_POSTFIXASSIGN:
471 assert( untypedExpr->get_args().size() == 1 );
472 (*arg)->accept( *this );
[6c4ff37]473 output << opInfo.symbol;
[51587aa]474 break;
[71f4e4f]475
[51587aa]476 case OT_INFIX:
477 case OT_INFIXASSIGN:
478 assert( untypedExpr->get_args().size() == 2 );
[6c4ff37]479 output << "(";
[51587aa]480 (*arg++)->accept( *this );
[6c4ff37]481 output << opInfo.symbol;
[51587aa]482 (*arg)->accept( *this );
[6c4ff37]483 output << ")";
[51587aa]484 break;
[71f4e4f]485
[51587aa]486 case OT_CONSTANT:
487 // there are no intrinsic definitions of 0 or 1 as functions
488 assert( false );
[3778cb2]489 } // switch
[51587aa]490 } else {
[8688ce1]491 if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
[ac911f4]492 assert( untypedExpr->get_args().size() == 2 );
493 (*untypedExpr->get_args().begin())->accept( *this );
494 output << " ... ";
495 (*--untypedExpr->get_args().end())->accept( *this );
[057b34f]496 } else { // builtin routines
497 nameExpr->accept( *this );
498 output << "(";
499 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
500 output << ")";
[66d12f7]501 } // if
[51587aa]502 } // if
503 } else {
504 untypedExpr->get_function()->accept( *this );
[6c4ff37]505 output << "(";
[51587aa]506 genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
[6c4ff37]507 output << ")";
[51587aa]508 } // if
509 }
[71f4e4f]510
[064e3ff]511 void CodeGenerator::visit( RangeExpr * rangeExpr ) {
512 rangeExpr->get_low()->accept( *this );
513 output << " ... ";
514 rangeExpr->get_high()->accept( *this );
515 }
516
[8688ce1]517 void CodeGenerator::visit( NameExpr * nameExpr ) {
[e04ef3a]518 extension( nameExpr );
[51587aa]519 OperatorInfo opInfo;
520 if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
521 assert( opInfo.type == OT_CONSTANT );
[6c4ff37]522 output << opInfo.symbol;
[51587aa]523 } else {
[6c4ff37]524 output << nameExpr->get_name();
[51587aa]525 } // if
526 }
[71f4e4f]527
[8688ce1]528 void CodeGenerator::visit( AddressExpr * addressExpr ) {
[e04ef3a]529 extension( addressExpr );
[6c4ff37]530 output << "(&";
[51587aa]531 // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
[8688ce1]532 if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
[6c4ff37]533 output << mangleName( variableExpr->get_var() );
[51587aa]534 } else {
535 addressExpr->get_arg()->accept( *this );
536 } // if
[6c4ff37]537 output << ")";
[51587aa]538 }
539
[8688ce1]540 void CodeGenerator::visit( CastExpr * castExpr ) {
[e04ef3a]541 extension( castExpr );
[803deb1]542 output << "(";
[906e24d]543 if ( castExpr->get_result()->isVoid() ) {
[803deb1]544 output << "(void)" ;
[906e24d]545 } else if ( ! castExpr->get_result()->get_isLvalue() ) {
[803deb1]546 // at least one result type of cast, but not an lvalue
547 output << "(";
[35b1bf4]548 output << genType( castExpr->get_result(), "", pretty );
[71f4e4f]549 output << ")";
[803deb1]550 } else {
[8e9cbb2]551 // otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
[803deb1]552 // never an lvalue in C
[3778cb2]553 } // if
[803deb1]554 castExpr->get_arg()->accept( *this );
555 output << ")";
[51587aa]556 }
[71f4e4f]557
[8688ce1]558 void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) {
[51587aa]559 assert( false );
560 }
[71f4e4f]561
[8688ce1]562 void CodeGenerator::visit( MemberExpr * memberExpr ) {
[e04ef3a]563 extension( memberExpr );
[51587aa]564 memberExpr->get_aggregate()->accept( *this );
[6c4ff37]565 output << "." << mangleName( memberExpr->get_member() );
[51587aa]566 }
[71f4e4f]567
[8688ce1]568 void CodeGenerator::visit( VariableExpr * variableExpr ) {
[e04ef3a]569 extension( variableExpr );
[51587aa]570 OperatorInfo opInfo;
571 if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
[6c4ff37]572 output << opInfo.symbol;
[51587aa]573 } else {
[6c4ff37]574 output << mangleName( variableExpr->get_var() );
[51587aa]575 } // if
576 }
[71f4e4f]577
[8688ce1]578 void CodeGenerator::visit( ConstantExpr * constantExpr ) {
[51587aa]579 assert( constantExpr->get_constant() );
[e04ef3a]580 extension( constantExpr );
[51587aa]581 constantExpr->get_constant()->accept( *this );
582 }
[71f4e4f]583
[8688ce1]584 void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
[e04ef3a]585 extension( sizeofExpr );
[6c4ff37]586 output << "sizeof(";
[51587aa]587 if ( sizeofExpr->get_isType() ) {
[35b1bf4]588 output << genType( sizeofExpr->get_type(), "", pretty );
[51587aa]589 } else {
590 sizeofExpr->get_expr()->accept( *this );
591 } // if
[6c4ff37]592 output << ")";
[51587aa]593 }
[47534159]594
[8688ce1]595 void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
[47534159]596 // use GCC extension to avoid bumping std to C11
[8e9cbb2]597 extension( alignofExpr );
[47534159]598 output << "__alignof__(";
[25a054f]599 if ( alignofExpr->get_isType() ) {
[35b1bf4]600 output << genType( alignofExpr->get_type(), "", pretty );
[47534159]601 } else {
[25a054f]602 alignofExpr->get_expr()->accept( *this );
[47534159]603 } // if
604 output << ")";
605 }
[71f4e4f]606
[8688ce1]607 void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
[8e9cbb2]608 assert( false && "UntypedOffsetofExpr should not reach code generation." );
[2a4b088]609 }
610
[8688ce1]611 void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
[25a054f]612 // use GCC builtin
613 output << "__builtin_offsetof(";
[35b1bf4]614 output << genType( offsetofExpr->get_type(), "", pretty );
[e551c69]615 output << ", " << mangleName( offsetofExpr->get_member() );
[25a054f]616 output << ")";
617 }
[d63eeb0]618
[8688ce1]619 void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
[8e9cbb2]620 assert( false && "OffsetPackExpr should not reach code generation." );
[afc1045]621 }
[70a06f6]622
[8688ce1]623 void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
[e04ef3a]624 extension( logicalExpr );
[6c4ff37]625 output << "(";
[51587aa]626 logicalExpr->get_arg1()->accept( *this );
627 if ( logicalExpr->get_isAnd() ) {
[6c4ff37]628 output << " && ";
[51587aa]629 } else {
[6c4ff37]630 output << " || ";
[51587aa]631 } // if
632 logicalExpr->get_arg2()->accept( *this );
[6c4ff37]633 output << ")";
[51587aa]634 }
[71f4e4f]635
[8688ce1]636 void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
[e04ef3a]637 extension( conditionalExpr );
[6c4ff37]638 output << "(";
[51587aa]639 conditionalExpr->get_arg1()->accept( *this );
[6c4ff37]640 output << " ? ";
[51587aa]641 conditionalExpr->get_arg2()->accept( *this );
[6c4ff37]642 output << " : ";
[51587aa]643 conditionalExpr->get_arg3()->accept( *this );
[6c4ff37]644 output << ")";
[51587aa]645 }
[71f4e4f]646
[8688ce1]647 void CodeGenerator::visit( CommaExpr * commaExpr ) {
[e04ef3a]648 extension( commaExpr );
[6c4ff37]649 output << "(";
[51587aa]650 commaExpr->get_arg1()->accept( *this );
[6c4ff37]651 output << " , ";
[51587aa]652 commaExpr->get_arg2()->accept( *this );
[6c4ff37]653 output << ")";
[51587aa]654 }
[71f4e4f]655
[907eccb]656 void CodeGenerator::visit( UntypedTupleExpr * tupleExpr ) { assertf( false, "UntypedTupleExpr should not make it to Code Gen" ); }
657
658 void CodeGenerator::visit( TupleExpr * tupleExpr ) { assertf( false, "TupleExpr should not make it to Code Gen" ); }
[71f4e4f]659
[8688ce1]660 void CodeGenerator::visit( TypeExpr * typeExpr ) {}
[2b6c1e0]661
[8688ce1]662 void CodeGenerator::visit( AsmExpr * asmExpr ) {
[7f5566b]663 if ( asmExpr->get_inout() ) {
664 output << "[ ";
665 asmExpr->get_inout()->accept( *this );
666 output << " ] ";
667 } // if
668 asmExpr->get_constraint()->accept( *this );
669 output << " ( ";
670 asmExpr->get_operand()->accept( *this );
671 output << " )";
672 }
673
[3c13c03]674 void CodeGenerator::visit( CompoundLiteralExpr *compLitExpr ) {
675 assert( compLitExpr->get_type() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
[35b1bf4]676 output << "(" << genType( compLitExpr->get_type(), "", pretty ) << ")";
[3c13c03]677 compLitExpr->get_initializer()->accept( *this );
678 }
679
[6eb8948]680 void CodeGenerator::visit( StmtExpr * stmtExpr ) {
[3c13c03]681 std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
682 output << "({" << std::endl;
683 cur_indent += CodeGenerator::tabsize;
684 unsigned int numStmts = stmts.size();
685 unsigned int i = 0;
686 for ( Statement * stmt : stmts ) {
687 output << indent << printLabels( stmt->get_labels() );
688 if ( i+1 == numStmts ) {
689 // last statement in a statement expression needs to be handled specially -
690 // cannot cast to void, otherwise the expression statement has no value
691 if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
692 exprStmt->get_expr()->accept( *this );
693 output << ";" << endl;
694 ++i;
695 break;
696 }
697 }
698 stmt->accept( *this );
699 output << endl;
700 if ( wantSpacing( stmt ) ) {
701 output << endl;
702 } // if
703 ++i;
704 }
705 cur_indent -= CodeGenerator::tabsize;
706 output << indent << "})";
[6eb8948]707 }
708
[51587aa]709 //*** Statements
[8688ce1]710 void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
[51587aa]711 std::list<Statement*> ks = compoundStmt->get_kids();
[2b6c1e0]712 output << "{" << endl;
[51587aa]713
[2b6c1e0]714 cur_indent += CodeGenerator::tabsize;
[51587aa]715
[7f5566b]716 for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
[cda48b6]717 output << indent << printLabels( (*i)->get_labels() );
[7f5566b]718 (*i)->accept( *this );
[2b6c1e0]719
[6c4ff37]720 output << endl;
[2b6c1e0]721 if ( wantSpacing( *i ) ) {
722 output << endl;
[3778cb2]723 } // if
[8688ce1]724 } // for
[71f4e4f]725 cur_indent -= CodeGenerator::tabsize;
[51587aa]726
[cda48b6]727 output << indent << "}";
[51587aa]728 }
729
[8688ce1]730 void CodeGenerator::visit( ExprStmt * exprStmt ) {
[6c4ff37]731 assert( exprStmt );
[321a2481]732 // cast the top-level expression to void to reduce gcc warnings.
733 Expression * expr = new CastExpr( exprStmt->get_expr() );
734 expr->accept( *this );
735 output << ";";
[51587aa]736 }
737
[8688ce1]738 void CodeGenerator::visit( AsmStmt * asmStmt ) {
[7f5566b]739 output << "asm ";
740 if ( asmStmt->get_voltile() ) output << "volatile ";
741 if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
742 output << "( ";
743 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
744 output << " : ";
745 genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
746 output << " : ";
747 genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
748 output << " : ";
749 genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
750 if ( ! asmStmt->get_gotolabels().empty() ) {
751 output << " : ";
752 for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
753 output << *begin++;
754 if ( begin == asmStmt->get_gotolabels().end() ) break;
755 output << ", ";
756 } // for
757 } // if
758 output << " );" ;
759 }
760
[e994912]761 void CodeGenerator::visit( AsmDecl * asmDecl ) {
762 output << "asm ";
763 AsmStmt * asmStmt = asmDecl->get_stmt();
764 output << "( ";
765 if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
766 output << " )" ;
767 }
768
[8688ce1]769 void CodeGenerator::visit( IfStmt * ifStmt ) {
[7f5566b]770 output << "if ( ";
771 ifStmt->get_condition()->accept( *this );
772 output << " ) ";
[51587aa]773
[7f5566b]774 ifStmt->get_thenPart()->accept( *this );
[51587aa]775
776 if ( ifStmt->get_elsePart() != 0) {
[2b6c1e0]777 output << " else ";
[7f5566b]778 ifStmt->get_elsePart()->accept( *this );
[51587aa]779 } // if
780 }
781
[8688ce1]782 void CodeGenerator::visit( SwitchStmt * switchStmt ) {
[7f5566b]783 output << "switch ( " ;
784 switchStmt->get_condition()->accept( *this );
785 output << " ) ";
[71f4e4f]786
[2b6c1e0]787 output << "{" << std::endl;
[6c4ff37]788 cur_indent += CodeGenerator::tabsize;
[8688ce1]789 acceptAll( switchStmt->get_statements(), *this );
[6c4ff37]790 cur_indent -= CodeGenerator::tabsize;
[cda48b6]791 output << indent << "}";
[51587aa]792 }
793
[8688ce1]794 void CodeGenerator::visit( CaseStmt * caseStmt ) {
[cda48b6]795 output << indent;
[eb3261f]796 if ( caseStmt->isDefault()) {
[2b6c1e0]797 output << "default";
[eb3261f]798 } else {
[2b6c1e0]799 output << "case ";
[7f5566b]800 caseStmt->get_condition()->accept( *this );
[17cd4eb]801 } // if
[6c4ff37]802 output << ":\n";
[71f4e4f]803
[51587aa]804 std::list<Statement *> sts = caseStmt->get_statements();
805
[6c4ff37]806 cur_indent += CodeGenerator::tabsize;
[51587aa]807 for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
[cda48b6]808 output << indent << printLabels( (*i)->get_labels() ) ;
[7f5566b]809 (*i)->accept( *this );
[6c4ff37]810 output << endl;
[3778cb2]811 } // for
[6c4ff37]812 cur_indent -= CodeGenerator::tabsize;
[51587aa]813 }
814
[8688ce1]815 void CodeGenerator::visit( BranchStmt * branchStmt ) {
[51587aa]816 switch ( branchStmt->get_type()) {
817 case BranchStmt::Goto:
818 if ( ! branchStmt->get_target().empty() )
[6c4ff37]819 output << "goto " << branchStmt->get_target();
[71f4e4f]820 else {
[51587aa]821 if ( branchStmt->get_computedTarget() != 0 ) {
[6c4ff37]822 output << "goto *";
[51587aa]823 branchStmt->get_computedTarget()->accept( *this );
824 } // if
825 } // if
826 break;
827 case BranchStmt::Break:
[6c4ff37]828 output << "break";
[51587aa]829 break;
830 case BranchStmt::Continue:
[6c4ff37]831 output << "continue";
[51587aa]832 break;
[3778cb2]833 } // switch
[2b6c1e0]834 output << ";";
[51587aa]835 }
836
837
[8688ce1]838 void CodeGenerator::visit( ReturnStmt * returnStmt ) {
[6c4ff37]839 output << "return ";
[4b2589a]840 maybeAccept( returnStmt->get_expr(), *this );
[6c4ff37]841 output << ";";
[51587aa]842 }
843
[8688ce1]844 void CodeGenerator::visit( WhileStmt * whileStmt ) {
[321a2481]845 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]846 output << "do" ;
[321a2481]847 } else {
[6c4ff37]848 output << "while (" ;
[7f5566b]849 whileStmt->get_condition()->accept( *this );
[6c4ff37]850 output << ")";
[51587aa]851 } // if
[2b6c1e0]852 output << " ";
[51587aa]853
[2b6c1e0]854 output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
[51587aa]855 whileStmt->get_body()->accept( *this );
856
[cda48b6]857 output << indent;
[51587aa]858
859 if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]860 output << " while (" ;
[7f5566b]861 whileStmt->get_condition()->accept( *this );
[6c4ff37]862 output << ");";
[51587aa]863 } // if
864 }
865
[8688ce1]866 void CodeGenerator::visit( ForStmt * forStmt ) {
[8e9cbb2]867 // initialization is always hoisted, so don't bother doing anything with that
[145f1fc]868 output << "for (;";
[51587aa]869
[321a2481]870 if ( forStmt->get_condition() != 0 ) {
[51587aa]871 forStmt->get_condition()->accept( *this );
[3778cb2]872 } // if
[6c4ff37]873 output << ";";
[51587aa]874
[321a2481]875 if ( forStmt->get_increment() != 0 ) {
876 // cast the top-level expression to void to reduce gcc warnings.
877 Expression * expr = new CastExpr( forStmt->get_increment() );
878 expr->accept( *this );
[3778cb2]879 } // if
[2b6c1e0]880 output << ") ";
[51587aa]881
882 if ( forStmt->get_body() != 0 ) {
[2b6c1e0]883 output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
[51587aa]884 forStmt->get_body()->accept( *this );
885 } // if
886 }
887
[8688ce1]888 void CodeGenerator::visit( NullStmt * nullStmt ) {
[cda48b6]889 //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
[6c4ff37]890 output << "/* null statement */ ;";
[51587aa]891 }
892
[8688ce1]893 void CodeGenerator::visit( DeclStmt * declStmt ) {
[51587aa]894 declStmt->get_decl()->accept( *this );
[71f4e4f]895
[51587aa]896 if ( doSemicolon( declStmt->get_decl() ) ) {
[6c4ff37]897 output << ";";
[51587aa]898 } // if
899 }
900
[8688ce1]901 void CodeGenerator::handleStorageClass( Declaration * decl ) {
[51587aa]902 switch ( decl->get_storageClass() ) {
[68cd1ce]903 case DeclarationNode::Extern:
[6c4ff37]904 output << "extern ";
[51587aa]905 break;
[68cd1ce]906 case DeclarationNode::Static:
[6c4ff37]907 output << "static ";
[51587aa]908 break;
[68cd1ce]909 case DeclarationNode::Auto:
[51587aa]910 // silently drop storage class
911 break;
[68cd1ce]912 case DeclarationNode::Register:
[6c4ff37]913 output << "register ";
[51587aa]914 break;
[68cd1ce]915 case DeclarationNode::Inline:
[de62360d]916 output << "inline ";
[f38c8d9]917 break;
[68cd1ce]918 case DeclarationNode::Fortran:
919 output << "fortran ";
920 break;
921 case DeclarationNode::Noreturn:
922 output << "_Noreturn ";
923 break;
924 case DeclarationNode::Threadlocal:
925 output << "_Thread_local ";
926 break;
927 case DeclarationNode::NoStorageClass:
[f38c8d9]928 break;
[843054c2]929 } // switch
[51587aa]930 }
[9facf3b]931
932 std::string genName( DeclarationWithType * decl ) {
933 CodeGen::OperatorInfo opInfo;
934 if ( operatorLookup( decl->get_name(), opInfo ) ) {
935 return opInfo.outputName;
936 } else {
937 return decl->get_name();
938 } // if
939 }
[51b73452]940} // namespace CodeGen
[51587aa]941
942// Local Variables: //
943// tab-width: 4 //
944// mode: c++ //
945// compile-command: "make install" //
946// End: //
Note: See TracBrowser for help on using the repository browser.