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source: src/CodeGen/CodeGenerator.cc @ ac93b228

ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsdeferred_resndemanglerenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newwith_gc

Last change on this file since ac93b228 was 44a81853, checked in by Peter A. Buhr <pabuhr@…>, 8 years ago
first attempt at gcc attributes
Property mode set to `100644`
File size: 27.8 KB

Rev	Line
[51587aa]	1	//
	2	// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
	3	//
	4	// The contents of this file are covered under the licence agreement in the
	5	// file "LICENCE" distributed with Cforall.
	6	//
[71f4e4f]	7	// CodeGenerator.cc --
[51587aa]	8	//
	9	// Author : Richard C. Bilson
	10	// Created On : Mon May 18 07:44:20 2015
[8688ce1]	11	// Last Modified By : Peter A. Buhr
[44a81853]	12	// Last Modified On : Wed Jan 18 15:23:08 2017
	13	// Update Count : 414
[51587aa]	14	//
	15
[51b7345]	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"
[51b7345]	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"
[51b7345]	29
[d3b7937]	30	#include "Common/utility.h"
	31	#include "Common/UnimplementedError.h"
[51b7345]	32
[a61fea9a]	33	#include "CodeGenerator.h"
[51b7345]	34	#include "OperatorTable.h"
	35	#include "GenType.h"
	36
[10a7775]	37	#include "InitTweak/InitTweak.h"
	38
[51b7345]	39	using namespace std;
	40
	41	namespace CodeGen {
[6c4ff37]	42	int CodeGenerator::tabsize = 4;
[51587aa]	43
[145f1fc]	44	// the kinds of statements that would ideally be followed by whitespace
[2b6c1e0]	45	bool wantSpacing( Statement * stmt) {
	46	return dynamic_cast< IfStmt * >( stmt ) \|\| dynamic_cast< CompoundStmt * >( stmt ) \|\|
[08061589]	47	dynamic_cast< WhileStmt * >( stmt ) \|\| dynamic_cast< ForStmt * >( stmt ) \|\| dynamic_cast< SwitchStmt *>( stmt );
[2b6c1e0]	48	}
	49
[8688ce1]	50	void CodeGenerator::extension( Expression * expr ) {
[8e9cbb2]	51	if ( expr->get_extension() ) {
	52	output << "__extension__ ";
	53	} // if
	54	} // extension
	55
[8688ce1]	56	void CodeGenerator::extension( Declaration * decl ) {
[8e9cbb2]	57	if ( decl->get_extension() ) {
	58	output << "__extension__ ";
	59	} // if
	60	} // extension
	61
[58dd019]	62	void CodeGenerator::asmName( DeclarationWithType * decl ) {
	63	if ( ConstantExpr * asmName = decl->get_asmName() ) {
	64	output << " asm ( " << asmName->get_constant()->get_value() << " )";
	65	} // if
	66	} // extension
	67
[888cbe4]	68	ostream & CodeGenerator::Indenter::operator()( ostream & output ) const {
[cda48b6]	69	return output << string( cg.cur_indent, ' ' );
	70	}
	71
[888cbe4]	72	ostream & operator<<( ostream & output, const CodeGenerator::Indenter &indent ) {
[cda48b6]	73	return indent( output );
	74	}
[51587aa]	75
[888cbe4]	76	CodeGenerator::LabelPrinter & CodeGenerator::LabelPrinter::operator()( std::list< Label > & l ) {
	77	labels = &l;
	78	return *this;
	79	}
	80
[8688ce1]	81	ostream & operator<<( ostream & output, CodeGenerator::LabelPrinter & printLabels ) {
[888cbe4]	82	std::list< Label > & labs = *printLabels.labels;
	83	// l.unique(); // assumes a sorted list. Why not use set? Does order matter?
	84	for ( Label & l : labs ) {
	85	output << l.get_name() + ": ";
	86	printLabels.cg.genAttributes( l.get_attributes() );
[8688ce1]	87	} // for
[888cbe4]	88	return output;
	89	}
	90
[486341f]	91	CodeGenerator::CodeGenerator( std::ostream & os, bool mangle ) : indent( this), cur_indent( 0 ), insideFunction( false ), output( os ), printLabels( this ), mangle( mangle ) {}
[cda48b6]	92
[8688ce1]	93	CodeGenerator::CodeGenerator( std::ostream & os, std::string init, int indentation, bool infunp )
[888cbe4]	94	: indent( this), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( this ) {
[6c4ff37]	95	//output << std::string( init );
[51587aa]	96	}
	97
[8688ce1]	98	CodeGenerator::CodeGenerator( std::ostream & os, char * init, int indentation, bool infunp )
[888cbe4]	99	: indent( this ), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( this ) {
[6c4ff37]	100	//output << std::string( init );
[51587aa]	101	}
	102
[486341f]	103	string CodeGenerator::mangleName( DeclarationWithType * decl ) {
	104	if ( ! mangle ) return decl->get_name();
[51587aa]	105	if ( decl->get_mangleName() != "" ) {
[f326f99]	106	// need to incorporate scope level in order to differentiate names for destructors
	107	return decl->get_scopedMangleName();
[51587aa]	108	} else {
	109	return decl->get_name();
	110	} // if
	111	}
[94b4364]	112
[44a81853]	113	void CodeGenerator::genAttributes( list< Attribute * > & attributes ) {
	114	if ( attributes.empty() ) return;
	115	output << "__attribute__ ((";
	116	for ( list< Attribute * >::iterator attr( attributes.begin() );; ) {
	117	output << (*attr)->get_name();
	118	if ( ! (*attr)->get_parameters().empty() ) {
	119	output << "(";
	120	genCommaList( (attr)->get_parameters().begin(), (attr)->get_parameters().end() );
	121	output << ")";
	122	} // if
	123	if ( ++attr == attributes.end() ) break;
	124	output << ","; // separator
	125	} // for
	126	output << ")) ";
	127	} // CodeGenerator::genAttributes
[7baed7d]	128
	129
	130	//*** Declarations
[8688ce1]	131	void CodeGenerator::visit( FunctionDecl * functionDecl ) {
[8e9cbb2]	132	extension( functionDecl );
[7baed7d]	133	genAttributes( functionDecl->get_attributes() );
	134
[51587aa]	135	handleStorageClass( functionDecl );
[f38c8d9]	136	if ( functionDecl->get_isInline() ) {
[6c4ff37]	137	output << "inline ";
[f38c8d9]	138	} // if
[de62360d]	139	if ( functionDecl->get_isNoreturn() ) {
	140	output << "_Noreturn ";
	141	} // if
[6c4ff37]	142	output << genType( functionDecl->get_functionType(), mangleName( functionDecl ) );
[51587aa]	143
	144	// how to get this to the Functype?
	145	std::list< Declaration * > olds = functionDecl->get_oldDecls();
	146	if ( ! olds.empty() ) {
[6c4ff37]	147	output << " /* function has old declaration */";
[51587aa]	148	} // if
	149
[58dd019]	150	asmName( functionDecl );
	151
[51587aa]	152	// acceptAll( functionDecl->get_oldDecls(), *this );
	153	if ( functionDecl->get_statements() ) {
[7f5566b]	154	functionDecl->get_statements()->accept( *this );
[51587aa]	155	} // if
	156	}
	157
[8688ce1]	158	void CodeGenerator::visit( ObjectDecl * objectDecl ) {
[8e9cbb2]	159	extension( objectDecl );
[f9cebb5]	160	genAttributes( objectDecl->get_attributes() );
	161
[51587aa]	162	handleStorageClass( objectDecl );
[6c4ff37]	163	output << genType( objectDecl->get_type(), mangleName( objectDecl ) );
[71f4e4f]	164
[58dd019]	165	asmName( objectDecl );
	166
[51587aa]	167	if ( objectDecl->get_init() ) {
[6c4ff37]	168	output << " = ";
[51587aa]	169	objectDecl->get_init()->accept( *this );
	170	} // if
[3778cb2]	171
[51587aa]	172	if ( objectDecl->get_bitfieldWidth() ) {
[6c4ff37]	173	output << ":";
[51587aa]	174	objectDecl->get_bitfieldWidth()->accept( *this );
	175	} // if
	176	}
	177
[8688ce1]	178	void CodeGenerator::handleAggregate( AggregateDecl * aggDecl ) {
[51587aa]	179	if ( aggDecl->get_name() != "" )
[6c4ff37]	180	output << aggDecl->get_name();
[71f4e4f]	181
[2c57025]	182	// std::list< Declaration * > & memb = aggDecl->get_members();
	183	// if ( ! memb.empty() ) {
	184	if ( aggDecl->has_body() ) {
	185	std::list< Declaration * > & memb = aggDecl->get_members();
[94b4364]	186	output << " {" << endl;
[51587aa]	187
[71f4e4f]	188	cur_indent += CodeGenerator::tabsize;
[3778cb2]	189	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) {
[71f4e4f]	190	output << indent;
[7f5566b]	191	(i)->accept( this );
[6c4ff37]	192	output << ";" << endl;
[3778cb2]	193	} // for
[51587aa]	194
[71f4e4f]	195	cur_indent -= CodeGenerator::tabsize;
[51587aa]	196
[cda48b6]	197	output << indent << "}";
[17cd4eb]	198	} // if
[51587aa]	199	}
[17cd4eb]	200
[8688ce1]	201	void CodeGenerator::visit( StructDecl * structDecl ) {
[8e9cbb2]	202	extension( structDecl );
[6c4ff37]	203	output << "struct ";
[51587aa]	204	handleAggregate( structDecl );
	205	}
[17cd4eb]	206
[8688ce1]	207	void CodeGenerator::visit( UnionDecl * unionDecl ) {
[8e9cbb2]	208	extension( unionDecl );
[6c4ff37]	209	output << "union ";
[8e9cbb2]	210	handleAggregate( unionDecl );
[51587aa]	211	}
[71f4e4f]	212
[8688ce1]	213	void CodeGenerator::visit( EnumDecl * enumDecl ) {
[8e9cbb2]	214	extension( enumDecl );
[6c4ff37]	215	output << "enum ";
[51587aa]	216
[8e9cbb2]	217	if ( enumDecl->get_name() != "" )
	218	output << enumDecl->get_name();
[71f4e4f]	219
[8e9cbb2]	220	std::list< Declaration* > &memb = enumDecl->get_members();
[51587aa]	221
	222	if ( ! memb.empty() ) {
[cda48b6]	223	output << " {" << endl;
[51587aa]	224
[71f4e4f]	225	cur_indent += CodeGenerator::tabsize;
[51587aa]	226	for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) {
[8688ce1]	227	ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i );
[51587aa]	228	assert( obj );
[71f4e4f]	229	output << indent << mangleName( obj );
[51587aa]	230	if ( obj->get_init() ) {
[6c4ff37]	231	output << " = ";
[7f5566b]	232	obj->get_init()->accept( *this );
[51587aa]	233	} // if
[6c4ff37]	234	output << "," << endl;
[51587aa]	235	} // for
	236
[71f4e4f]	237	cur_indent -= CodeGenerator::tabsize;
[51587aa]	238
[cda48b6]	239	output << indent << "}";
[51587aa]	240	} // if
	241	}
[71f4e4f]	242
[8688ce1]	243	void CodeGenerator::visit( TraitDecl * traitDecl ) {}
[71f4e4f]	244
[8688ce1]	245	void CodeGenerator::visit( TypedefDecl * typeDecl ) {
[8e9cbb2]	246	assert( false && "Typedefs are removed and substituted in earlier passes." );
	247	//output << "typedef ";
	248	//output << genType( typeDecl->get_base(), typeDecl->get_name() );
[51587aa]	249	}
[71f4e4f]	250
[8688ce1]	251	void CodeGenerator::visit( TypeDecl * typeDecl ) {
[51587aa]	252	// really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes,
	253	// still to be done
[8e9cbb2]	254	extension( typeDecl );
[6c4ff37]	255	output << "extern unsigned long " << typeDecl->get_name();
[51587aa]	256	if ( typeDecl->get_base() ) {
[6c4ff37]	257	output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )";
[51587aa]	258	} // if
	259	}
	260
[e45215c]	261	void CodeGenerator::printDesignators( std::list< Expression * > & designators ) {
	262	typedef std::list< Expression * > DesignatorList;
	263	if ( designators.size() == 0 ) return;
	264	for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) {
[8a4da06]	265	if ( dynamic_cast< NameExpr * >( *iter ) ) {
[f32c7f4]	266	// if expression is a name, then initializing aggregate member
	267	output << ".";
	268	(iter)->accept( this );
	269	} else {
	270	// if not a simple name, it has to be a constant expression, i.e. an array designator
[e45215c]	271	output << "[";
	272	(iter)->accept( this );
	273	output << "]";
[3778cb2]	274	} // if
	275	} // for
[e45215c]	276	output << " = ";
	277	}
	278
[8688ce1]	279	void CodeGenerator::visit( SingleInit * init ) {
[e45215c]	280	printDesignators( init->get_designators() );
[51587aa]	281	init->get_value()->accept( *this );
	282	}
	283
[8688ce1]	284	void CodeGenerator::visit( ListInit * init ) {
[e45215c]	285	printDesignators( init->get_designators() );
[6c4ff37]	286	output << "{ ";
[4d2434a]	287	if ( init->begin() == init->end() ) {
[8e9cbb2]	288	// illegal to leave initializer list empty for scalar initializers, but always legal to have 0
[5b40f30]	289	output << "0";
	290	} else {
[4d2434a]	291	genCommaList( init->begin(), init->end() );
[8688ce1]	292	} // if
[6c4ff37]	293	output << " }";
[51587aa]	294	}
	295
[fc638d2]	296	void CodeGenerator::visit( ConstructorInit * init ){
	297	assertf( false, "ConstructorInit nodes should not make it to CodeGen." );
	298	}
	299
[8688ce1]	300	void CodeGenerator::visit( Constant * constant ) {
[6c4ff37]	301	output << constant->get_value() ;
[51587aa]	302	}
	303
	304	//*** Expressions
[8688ce1]	305	void CodeGenerator::visit( ApplicationExpr * applicationExpr ) {
[e04ef3a]	306	extension( applicationExpr );
[8688ce1]	307	if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) {
[51587aa]	308	OperatorInfo opInfo;
	309	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) {
	310	std::list< Expression* >::iterator arg = applicationExpr->get_args().begin();
	311	switch ( opInfo.type ) {
	312	case OT_PREFIXASSIGN:
	313	case OT_POSTFIXASSIGN:
	314	case OT_INFIXASSIGN:
[356189a]	315	case OT_CTOR:
[c2ce2350]	316	case OT_DTOR:
[51587aa]	317	{
	318	assert( arg != applicationExpr->get_args().end() );
[8688ce1]	319	if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) {
[356189a]	320	// remove & from first assignment/ctor argument
[51587aa]	321	*arg = addrExpr->get_arg();
	322	} else {
[356189a]	323	// no address-of operator, so must be a pointer - add dereference
[066d77a]	324	// NOTE: if the assertion starts to trigger, check that the application expr isn't being shared.
	325	// Since its arguments are modified here, this assertion most commonly triggers when the application
	326	// is visited multiple times.
[8688ce1]	327	UntypedExpr * newExpr = new UntypedExpr( new NameExpr( "*?" ) );
[51587aa]	328	newExpr->get_args().push_back( *arg );
[906e24d]	329	Type * type = InitTweak::getPointerBase( (*arg)->get_result() );
[066d77a]	330	assertf( type, "First argument to a derefence must be a pointer. Ensure that expressions are not being shared." );
[906e24d]	331	newExpr->set_result( type->clone() );
[51587aa]	332	*arg = newExpr;
	333	} // if
	334	break;
	335	}
[71f4e4f]	336
[51587aa]	337	default:
	338	// do nothing
	339	;
[3778cb2]	340	} // switch
[71f4e4f]	341
[51587aa]	342	switch ( opInfo.type ) {
	343	case OT_INDEX:
	344	assert( applicationExpr->get_args().size() == 2 );
	345	(arg++)->accept( this );
[6c4ff37]	346	output << "[";
[51587aa]	347	(arg)->accept( this );
[6c4ff37]	348	output << "]";
[51587aa]	349	break;
[71f4e4f]	350
[51587aa]	351	case OT_CALL:
[356189a]	352	// there are no intrinsic definitions of the function call operator
[51587aa]	353	assert( false );
	354	break;
[71f4e4f]	355
[f1e012b]	356	case OT_CTOR:
[c2ce2350]	357	case OT_DTOR:
[356189a]	358	if ( applicationExpr->get_args().size() == 1 ) {
[8e9cbb2]	359	// the expression fed into a single parameter constructor or destructor may contain side
	360	// effects, so must still output this expression
[64071c2]	361	output << "(";
[356189a]	362	(arg++)->accept( this );
[64071c2]	363	output << ") /* " << opInfo.inputName << " */";
[356189a]	364	} else if ( applicationExpr->get_args().size() == 2 ) {
[c2ce2350]	365	// intrinsic two parameter constructors are essentially bitwise assignment
[356189a]	366	output << "(";
	367	(arg++)->accept( this );
	368	output << opInfo.symbol;
	369	(arg)->accept( this );
[c2ce2350]	370	output << ") /* " << opInfo.inputName << " */";
[356189a]	371	} else {
[c2ce2350]	372	// no constructors with 0 or more than 2 parameters
[356189a]	373	assert( false );
[8688ce1]	374	} // if
[356189a]	375	break;
[f1e012b]	376
[51587aa]	377	case OT_PREFIX:
	378	case OT_PREFIXASSIGN:
	379	assert( applicationExpr->get_args().size() == 1 );
[6c4ff37]	380	output << "(";
	381	output << opInfo.symbol;
[51587aa]	382	(arg)->accept( this );
[6c4ff37]	383	output << ")";
[51587aa]	384	break;
[71f4e4f]	385
[51587aa]	386	case OT_POSTFIX:
	387	case OT_POSTFIXASSIGN:
	388	assert( applicationExpr->get_args().size() == 1 );
	389	(arg)->accept( this );
[6c4ff37]	390	output << opInfo.symbol;
[51587aa]	391	break;
	392
[f1e012b]	393
[51587aa]	394	case OT_INFIX:
	395	case OT_INFIXASSIGN:
	396	assert( applicationExpr->get_args().size() == 2 );
[6c4ff37]	397	output << "(";
[51587aa]	398	(arg++)->accept( this );
[6c4ff37]	399	output << opInfo.symbol;
[51587aa]	400	(arg)->accept( this );
[6c4ff37]	401	output << ")";
[51587aa]	402	break;
[71f4e4f]	403
[51587aa]	404	case OT_CONSTANT:
[721f17a]	405	case OT_LABELADDRESS:
	406	// there are no intrinsic definitions of 0/1 or label addresses as functions
[51587aa]	407	assert( false );
[3778cb2]	408	} // switch
[17cd4eb]	409	} else {
[51587aa]	410	varExpr->accept( *this );
[6c4ff37]	411	output << "(";
[51587aa]	412	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]	413	output << ")";
[17cd4eb]	414	} // if
[51587aa]	415	} else {
	416	applicationExpr->get_function()->accept( *this );
[6c4ff37]	417	output << "(";
[51587aa]	418	genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
[6c4ff37]	419	output << ")";
[51587aa]	420	} // if
	421	}
[71f4e4f]	422
[8688ce1]	423	void CodeGenerator::visit( UntypedExpr * untypedExpr ) {
[e04ef3a]	424	extension( untypedExpr );
[8688ce1]	425	if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
[51587aa]	426	OperatorInfo opInfo;
	427	if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
	428	std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
	429	switch ( opInfo.type ) {
	430	case OT_INDEX:
	431	assert( untypedExpr->get_args().size() == 2 );
	432	(arg++)->accept( this );
[6c4ff37]	433	output << "[";
[51587aa]	434	(arg)->accept( this );
[6c4ff37]	435	output << "]";
[51587aa]	436	break;
[71f4e4f]	437
[51587aa]	438	case OT_CALL:
[f1e012b]	439	assert( false );
	440
[c2ce2350]	441	case OT_CTOR:
	442	case OT_DTOR:
	443	if ( untypedExpr->get_args().size() == 1 ) {
[8e9cbb2]	444	// the expression fed into a single parameter constructor or destructor may contain side
	445	// effects, so must still output this expression
[64071c2]	446	output << "(";
[c2ce2350]	447	(arg++)->accept( this );
[64071c2]	448	output << ") /* " << opInfo.inputName << " */";
[c2ce2350]	449	} else if ( untypedExpr->get_args().size() == 2 ) {
	450	// intrinsic two parameter constructors are essentially bitwise assignment
	451	output << "(";
	452	(arg++)->accept( this );
	453	output << opInfo.symbol;
	454	(arg)->accept( this );
	455	output << ") /* " << opInfo.inputName << " */";
	456	} else {
	457	// no constructors with 0 or more than 2 parameters
	458	assert( false );
[3778cb2]	459	} // if
[51587aa]	460	break;
[71f4e4f]	461
[51587aa]	462	case OT_PREFIX:
	463	case OT_PREFIXASSIGN:
[de62360d]	464	case OT_LABELADDRESS:
[51587aa]	465	assert( untypedExpr->get_args().size() == 1 );
[6c4ff37]	466	output << "(";
	467	output << opInfo.symbol;
[51587aa]	468	(arg)->accept( this );
[6c4ff37]	469	output << ")";
[51587aa]	470	break;
[71f4e4f]	471
[51587aa]	472	case OT_POSTFIX:
	473	case OT_POSTFIXASSIGN:
	474	assert( untypedExpr->get_args().size() == 1 );
	475	(arg)->accept( this );
[6c4ff37]	476	output << opInfo.symbol;
[51587aa]	477	break;
[71f4e4f]	478
[51587aa]	479	case OT_INFIX:
	480	case OT_INFIXASSIGN:
	481	assert( untypedExpr->get_args().size() == 2 );
[6c4ff37]	482	output << "(";
[51587aa]	483	(arg++)->accept( this );
[6c4ff37]	484	output << opInfo.symbol;
[51587aa]	485	(arg)->accept( this );
[6c4ff37]	486	output << ")";
[51587aa]	487	break;
[71f4e4f]	488
[51587aa]	489	case OT_CONSTANT:
	490	// there are no intrinsic definitions of 0 or 1 as functions
	491	assert( false );
[3778cb2]	492	} // switch
[51587aa]	493	} else {
[8688ce1]	494	if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2
[ac911f4]	495	assert( untypedExpr->get_args().size() == 2 );
	496	(untypedExpr->get_args().begin())->accept( this );
	497	output << " ... ";
	498	(--untypedExpr->get_args().end())->accept( this );
[057b34f]	499	} else { // builtin routines
	500	nameExpr->accept( *this );
	501	output << "(";
	502	genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
	503	output << ")";
[66d12f7]	504	} // if
[51587aa]	505	} // if
	506	} else {
	507	untypedExpr->get_function()->accept( *this );
[6c4ff37]	508	output << "(";
[51587aa]	509	genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
[6c4ff37]	510	output << ")";
[51587aa]	511	} // if
	512	}
[71f4e4f]	513
[064e3ff]	514	void CodeGenerator::visit( RangeExpr * rangeExpr ) {
	515	rangeExpr->get_low()->accept( *this );
	516	output << " ... ";
	517	rangeExpr->get_high()->accept( *this );
	518	}
	519
[8688ce1]	520	void CodeGenerator::visit( NameExpr * nameExpr ) {
[e04ef3a]	521	extension( nameExpr );
[51587aa]	522	OperatorInfo opInfo;
	523	if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
	524	assert( opInfo.type == OT_CONSTANT );
[6c4ff37]	525	output << opInfo.symbol;
[51587aa]	526	} else {
[6c4ff37]	527	output << nameExpr->get_name();
[51587aa]	528	} // if
	529	}
[71f4e4f]	530
[8688ce1]	531	void CodeGenerator::visit( AddressExpr * addressExpr ) {
[e04ef3a]	532	extension( addressExpr );
[6c4ff37]	533	output << "(&";
[51587aa]	534	// this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
[8688ce1]	535	if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
[6c4ff37]	536	output << mangleName( variableExpr->get_var() );
[51587aa]	537	} else {
	538	addressExpr->get_arg()->accept( *this );
	539	} // if
[6c4ff37]	540	output << ")";
[51587aa]	541	}
	542
[8688ce1]	543	void CodeGenerator::visit( CastExpr * castExpr ) {
[e04ef3a]	544	extension( castExpr );
[803deb1]	545	output << "(";
[906e24d]	546	if ( castExpr->get_result()->isVoid() ) {
[803deb1]	547	output << "(void)" ;
[906e24d]	548	} else if ( ! castExpr->get_result()->get_isLvalue() ) {
[803deb1]	549	// at least one result type of cast, but not an lvalue
	550	output << "(";
[906e24d]	551	output << genType( castExpr->get_result(), "" );
[71f4e4f]	552	output << ")";
[803deb1]	553	} else {
[8e9cbb2]	554	// otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is
[803deb1]	555	// never an lvalue in C
[3778cb2]	556	} // if
[803deb1]	557	castExpr->get_arg()->accept( *this );
	558	output << ")";
[51587aa]	559	}
[71f4e4f]	560
[8688ce1]	561	void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) {
[51587aa]	562	assert( false );
	563	}
[71f4e4f]	564
[8688ce1]	565	void CodeGenerator::visit( MemberExpr * memberExpr ) {
[e04ef3a]	566	extension( memberExpr );
[51587aa]	567	memberExpr->get_aggregate()->accept( *this );
[6c4ff37]	568	output << "." << mangleName( memberExpr->get_member() );
[51587aa]	569	}
[71f4e4f]	570
[8688ce1]	571	void CodeGenerator::visit( VariableExpr * variableExpr ) {
[e04ef3a]	572	extension( variableExpr );
[51587aa]	573	OperatorInfo opInfo;
	574	if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
[6c4ff37]	575	output << opInfo.symbol;
[51587aa]	576	} else {
[6c4ff37]	577	output << mangleName( variableExpr->get_var() );
[51587aa]	578	} // if
	579	}
[71f4e4f]	580
[8688ce1]	581	void CodeGenerator::visit( ConstantExpr * constantExpr ) {
[51587aa]	582	assert( constantExpr->get_constant() );
[e04ef3a]	583	extension( constantExpr );
[51587aa]	584	constantExpr->get_constant()->accept( *this );
	585	}
[71f4e4f]	586
[8688ce1]	587	void CodeGenerator::visit( SizeofExpr * sizeofExpr ) {
[e04ef3a]	588	extension( sizeofExpr );
[6c4ff37]	589	output << "sizeof(";
[51587aa]	590	if ( sizeofExpr->get_isType() ) {
[6c4ff37]	591	output << genType( sizeofExpr->get_type(), "" );
[51587aa]	592	} else {
	593	sizeofExpr->get_expr()->accept( *this );
	594	} // if
[6c4ff37]	595	output << ")";
[51587aa]	596	}
[47534159]	597
[8688ce1]	598	void CodeGenerator::visit( AlignofExpr * alignofExpr ) {
[47534159]	599	// use GCC extension to avoid bumping std to C11
[8e9cbb2]	600	extension( alignofExpr );
[47534159]	601	output << "__alignof__(";
[25a054f]	602	if ( alignofExpr->get_isType() ) {
	603	output << genType( alignofExpr->get_type(), "" );
[47534159]	604	} else {
[25a054f]	605	alignofExpr->get_expr()->accept( *this );
[47534159]	606	} // if
	607	output << ")";
	608	}
[71f4e4f]	609
[8688ce1]	610	void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) {
[8e9cbb2]	611	assert( false && "UntypedOffsetofExpr should not reach code generation." );
[2a4b088]	612	}
	613
[8688ce1]	614	void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) {
[25a054f]	615	// use GCC builtin
	616	output << "__builtin_offsetof(";
	617	output << genType( offsetofExpr->get_type(), "" );
[e551c69]	618	output << ", " << mangleName( offsetofExpr->get_member() );
[25a054f]	619	output << ")";
	620	}
[d63eeb0]	621
[8688ce1]	622	void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) {
[8e9cbb2]	623	assert( false && "OffsetPackExpr should not reach code generation." );
[afc1045]	624	}
[70a06f6]	625
[8688ce1]	626	void CodeGenerator::visit( LogicalExpr * logicalExpr ) {
[e04ef3a]	627	extension( logicalExpr );
[6c4ff37]	628	output << "(";
[51587aa]	629	logicalExpr->get_arg1()->accept( *this );
	630	if ( logicalExpr->get_isAnd() ) {
[6c4ff37]	631	output << " && ";
[51587aa]	632	} else {
[6c4ff37]	633	output << " \|\| ";
[51587aa]	634	} // if
	635	logicalExpr->get_arg2()->accept( *this );
[6c4ff37]	636	output << ")";
[51587aa]	637	}
[71f4e4f]	638
[8688ce1]	639	void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) {
[e04ef3a]	640	extension( conditionalExpr );
[6c4ff37]	641	output << "(";
[51587aa]	642	conditionalExpr->get_arg1()->accept( *this );
[6c4ff37]	643	output << " ? ";
[51587aa]	644	conditionalExpr->get_arg2()->accept( *this );
[6c4ff37]	645	output << " : ";
[51587aa]	646	conditionalExpr->get_arg3()->accept( *this );
[6c4ff37]	647	output << ")";
[51587aa]	648	}
[71f4e4f]	649
[8688ce1]	650	void CodeGenerator::visit( CommaExpr * commaExpr ) {
[e04ef3a]	651	extension( commaExpr );
[6c4ff37]	652	output << "(";
[51587aa]	653	commaExpr->get_arg1()->accept( *this );
[6c4ff37]	654	output << " , ";
[51587aa]	655	commaExpr->get_arg2()->accept( *this );
[6c4ff37]	656	output << ")";
[51587aa]	657	}
[71f4e4f]	658
[907eccb]	659	void CodeGenerator::visit( UntypedTupleExpr * tupleExpr ) { assertf( false, "UntypedTupleExpr should not make it to Code Gen" ); }
	660
	661	void CodeGenerator::visit( TupleExpr * tupleExpr ) { assertf( false, "TupleExpr should not make it to Code Gen" ); }
[71f4e4f]	662
[8688ce1]	663	void CodeGenerator::visit( TypeExpr * typeExpr ) {}
[2b6c1e0]	664
[8688ce1]	665	void CodeGenerator::visit( AsmExpr * asmExpr ) {
[7f5566b]	666	if ( asmExpr->get_inout() ) {
	667	output << "[ ";
	668	asmExpr->get_inout()->accept( *this );
	669	output << " ] ";
	670	} // if
	671	asmExpr->get_constraint()->accept( *this );
	672	output << " ( ";
	673	asmExpr->get_operand()->accept( *this );
	674	output << " )";
	675	}
	676
[3c13c03]	677	void CodeGenerator::visit( CompoundLiteralExpr *compLitExpr ) {
	678	assert( compLitExpr->get_type() && dynamic_cast< ListInit * > ( compLitExpr->get_initializer() ) );
	679	output << "(" << genType( compLitExpr->get_type(), "" ) << ")";
	680	compLitExpr->get_initializer()->accept( *this );
	681	}
	682
[6eb8948]	683	void CodeGenerator::visit( StmtExpr * stmtExpr ) {
[3c13c03]	684	std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
	685	output << "({" << std::endl;
	686	cur_indent += CodeGenerator::tabsize;
	687	unsigned int numStmts = stmts.size();
	688	unsigned int i = 0;
	689	for ( Statement * stmt : stmts ) {
	690	output << indent << printLabels( stmt->get_labels() );
	691	if ( i+1 == numStmts ) {
	692	// last statement in a statement expression needs to be handled specially -
	693	// cannot cast to void, otherwise the expression statement has no value
	694	if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( stmt ) ) {
	695	exprStmt->get_expr()->accept( *this );
	696	output << ";" << endl;
	697	++i;
	698	break;
	699	}
	700	}
	701	stmt->accept( *this );
	702	output << endl;
	703	if ( wantSpacing( stmt ) ) {
	704	output << endl;
	705	} // if
	706	++i;
	707	}
	708	cur_indent -= CodeGenerator::tabsize;
	709	output << indent << "})";
[6eb8948]	710	}
	711
[51587aa]	712	//*** Statements
[8688ce1]	713	void CodeGenerator::visit( CompoundStmt * compoundStmt ) {
[51587aa]	714	std::list<Statement*> ks = compoundStmt->get_kids();
[2b6c1e0]	715	output << "{" << endl;
[51587aa]	716
[2b6c1e0]	717	cur_indent += CodeGenerator::tabsize;
[51587aa]	718
[7f5566b]	719	for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
[cda48b6]	720	output << indent << printLabels( (*i)->get_labels() );
[7f5566b]	721	(i)->accept( this );
[2b6c1e0]	722
[6c4ff37]	723	output << endl;
[2b6c1e0]	724	if ( wantSpacing( *i ) ) {
	725	output << endl;
[3778cb2]	726	} // if
[8688ce1]	727	} // for
[71f4e4f]	728	cur_indent -= CodeGenerator::tabsize;
[51587aa]	729
[cda48b6]	730	output << indent << "}";
[51587aa]	731	}
	732
[8688ce1]	733	void CodeGenerator::visit( ExprStmt * exprStmt ) {
[6c4ff37]	734	assert( exprStmt );
[321a2481]	735	// cast the top-level expression to void to reduce gcc warnings.
	736	Expression * expr = new CastExpr( exprStmt->get_expr() );
	737	expr->accept( *this );
	738	output << ";";
[51587aa]	739	}
	740
[8688ce1]	741	void CodeGenerator::visit( AsmStmt * asmStmt ) {
[7f5566b]	742	output << "asm ";
	743	if ( asmStmt->get_voltile() ) output << "volatile ";
	744	if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
	745	output << "( ";
	746	if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
	747	output << " : ";
	748	genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
	749	output << " : ";
	750	genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
	751	output << " : ";
	752	genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
	753	if ( ! asmStmt->get_gotolabels().empty() ) {
	754	output << " : ";
	755	for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
	756	output << *begin++;
	757	if ( begin == asmStmt->get_gotolabels().end() ) break;
	758	output << ", ";
	759	} // for
	760	} // if
	761	output << " );" ;
	762	}
	763
[8688ce1]	764	void CodeGenerator::visit( IfStmt * ifStmt ) {
[7f5566b]	765	output << "if ( ";
	766	ifStmt->get_condition()->accept( *this );
	767	output << " ) ";
[51587aa]	768
[7f5566b]	769	ifStmt->get_thenPart()->accept( *this );
[51587aa]	770
	771	if ( ifStmt->get_elsePart() != 0) {
[2b6c1e0]	772	output << " else ";
[7f5566b]	773	ifStmt->get_elsePart()->accept( *this );
[51587aa]	774	} // if
	775	}
	776
[8688ce1]	777	void CodeGenerator::visit( SwitchStmt * switchStmt ) {
[7f5566b]	778	output << "switch ( " ;
	779	switchStmt->get_condition()->accept( *this );
	780	output << " ) ";
[71f4e4f]	781
[2b6c1e0]	782	output << "{" << std::endl;
[6c4ff37]	783	cur_indent += CodeGenerator::tabsize;
[8688ce1]	784	acceptAll( switchStmt->get_statements(), *this );
[6c4ff37]	785	cur_indent -= CodeGenerator::tabsize;
[cda48b6]	786	output << indent << "}";
[51587aa]	787	}
	788
[8688ce1]	789	void CodeGenerator::visit( CaseStmt * caseStmt ) {
[cda48b6]	790	output << indent;
[eb3261f]	791	if ( caseStmt->isDefault()) {
[2b6c1e0]	792	output << "default";
[eb3261f]	793	} else {
[2b6c1e0]	794	output << "case ";
[7f5566b]	795	caseStmt->get_condition()->accept( *this );
[17cd4eb]	796	} // if
[6c4ff37]	797	output << ":\n";
[71f4e4f]	798
[51587aa]	799	std::list<Statement *> sts = caseStmt->get_statements();
	800
[6c4ff37]	801	cur_indent += CodeGenerator::tabsize;
[51587aa]	802	for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
[cda48b6]	803	output << indent << printLabels( (*i)->get_labels() ) ;
[7f5566b]	804	(i)->accept( this );
[6c4ff37]	805	output << endl;
[3778cb2]	806	} // for
[6c4ff37]	807	cur_indent -= CodeGenerator::tabsize;
[51587aa]	808	}
	809
[8688ce1]	810	void CodeGenerator::visit( BranchStmt * branchStmt ) {
[51587aa]	811	switch ( branchStmt->get_type()) {
	812	case BranchStmt::Goto:
	813	if ( ! branchStmt->get_target().empty() )
[6c4ff37]	814	output << "goto " << branchStmt->get_target();
[71f4e4f]	815	else {
[51587aa]	816	if ( branchStmt->get_computedTarget() != 0 ) {
[6c4ff37]	817	output << "goto *";
[51587aa]	818	branchStmt->get_computedTarget()->accept( *this );
	819	} // if
	820	} // if
	821	break;
	822	case BranchStmt::Break:
[6c4ff37]	823	output << "break";
[51587aa]	824	break;
	825	case BranchStmt::Continue:
[6c4ff37]	826	output << "continue";
[51587aa]	827	break;
[3778cb2]	828	} // switch
[2b6c1e0]	829	output << ";";
[51587aa]	830	}
	831
	832
[8688ce1]	833	void CodeGenerator::visit( ReturnStmt * returnStmt ) {
[6c4ff37]	834	output << "return ";
[4b2589a]	835	maybeAccept( returnStmt->get_expr(), *this );
[6c4ff37]	836	output << ";";
[51587aa]	837	}
	838
[8688ce1]	839	void CodeGenerator::visit( WhileStmt * whileStmt ) {
[321a2481]	840	if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]	841	output << "do" ;
[321a2481]	842	} else {
[6c4ff37]	843	output << "while (" ;
[7f5566b]	844	whileStmt->get_condition()->accept( *this );
[6c4ff37]	845	output << ")";
[51587aa]	846	} // if
[2b6c1e0]	847	output << " ";
[51587aa]	848
[2b6c1e0]	849	output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
[51587aa]	850	whileStmt->get_body()->accept( *this );
	851
[cda48b6]	852	output << indent;
[51587aa]	853
	854	if ( whileStmt->get_isDoWhile() ) {
[6c4ff37]	855	output << " while (" ;
[7f5566b]	856	whileStmt->get_condition()->accept( *this );
[6c4ff37]	857	output << ");";
[51587aa]	858	} // if
	859	}
	860
[8688ce1]	861	void CodeGenerator::visit( ForStmt * forStmt ) {
[8e9cbb2]	862	// initialization is always hoisted, so don't bother doing anything with that
[145f1fc]	863	output << "for (;";
[51587aa]	864
[321a2481]	865	if ( forStmt->get_condition() != 0 ) {
[51587aa]	866	forStmt->get_condition()->accept( *this );
[3778cb2]	867	} // if
[6c4ff37]	868	output << ";";
[51587aa]	869
[321a2481]	870	if ( forStmt->get_increment() != 0 ) {
	871	// cast the top-level expression to void to reduce gcc warnings.
	872	Expression * expr = new CastExpr( forStmt->get_increment() );
	873	expr->accept( *this );
[3778cb2]	874	} // if
[2b6c1e0]	875	output << ") ";
[51587aa]	876
	877	if ( forStmt->get_body() != 0 ) {
[2b6c1e0]	878	output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
[51587aa]	879	forStmt->get_body()->accept( *this );
	880	} // if
	881	}
	882
[8688ce1]	883	void CodeGenerator::visit( NullStmt * nullStmt ) {
[cda48b6]	884	//output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
[6c4ff37]	885	output << "/* null statement */ ;";
[51587aa]	886	}
	887
[8688ce1]	888	void CodeGenerator::visit( DeclStmt * declStmt ) {
[51587aa]	889	declStmt->get_decl()->accept( *this );
[71f4e4f]	890
[51587aa]	891	if ( doSemicolon( declStmt->get_decl() ) ) {
[6c4ff37]	892	output << ";";
[51587aa]	893	} // if
	894	}
	895
[8688ce1]	896	void CodeGenerator::handleStorageClass( Declaration * decl ) {
[51587aa]	897	switch ( decl->get_storageClass() ) {
[68cd1ce]	898	case DeclarationNode::Extern:
[6c4ff37]	899	output << "extern ";
[51587aa]	900	break;
[68cd1ce]	901	case DeclarationNode::Static:
[6c4ff37]	902	output << "static ";
[51587aa]	903	break;
[68cd1ce]	904	case DeclarationNode::Auto:
[51587aa]	905	// silently drop storage class
	906	break;
[68cd1ce]	907	case DeclarationNode::Register:
[6c4ff37]	908	output << "register ";
[51587aa]	909	break;
[68cd1ce]	910	case DeclarationNode::Inline:
[de62360d]	911	output << "inline ";
[f38c8d9]	912	break;
[68cd1ce]	913	case DeclarationNode::Fortran:
	914	output << "fortran ";
	915	break;
	916	case DeclarationNode::Noreturn:
	917	output << "_Noreturn ";
	918	break;
	919	case DeclarationNode::Threadlocal:
	920	output << "_Thread_local ";
	921	break;
	922	case DeclarationNode::NoStorageClass:
[f38c8d9]	923	break;
[843054c2]	924	} // switch
[51587aa]	925	}
[9facf3b]	926
	927	std::string genName( DeclarationWithType * decl ) {
	928	CodeGen::OperatorInfo opInfo;
	929	if ( operatorLookup( decl->get_name(), opInfo ) ) {
	930	return opInfo.outputName;
	931	} else {
	932	return decl->get_name();
	933	} // if
	934	}
[51b7345]	935	} // namespace CodeGen
[51587aa]	936
	937	// Local Variables: //
	938	// tab-width: 4 //
	939	// mode: c++ //
	940	// compile-command: "make install" //
	941	// End: //

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