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source: src/GenPoly/Box.cc@ 845cedc

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Last change on this file since 845cedc was dc2e7e0, checked in by Rob Schluntz <rschlunt@…>, 9 years ago
add ImplicitCopyCtorExpr returnDecls to Visitor, Mutator, print
Property mode set to `100644`
File size: 102.7 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	//
[ae63a18]	7	// Box.cc --
[51587aa]	8	//
	9	// Author : Richard C. Bilson
	10	// Created On : Mon May 18 07:44:20 2015
[bdf1954]	11	// Last Modified By : Rob Schluntz
[dc2e7e0]	12	// Last Modified On : Mon Apr 18 13:22:15 2016
[d63eeb0]	13	// Update Count : 295
[51587aa]	14	//
[51b73452]	15
[4e284ea6]	16	#include <algorithm>
	17	#include <iterator>
	18	#include <list>
	19	#include <map>
[51b73452]	20	#include <set>
[b1a6d6b]	21	#include <stack>
[51b73452]	22	#include <string>
[4e284ea6]	23	#include <utility>
	24	#include <vector>
[51b73452]	25	#include <cassert>
	26
	27	#include "Box.h"
[9d7b3ea]	28	#include "DeclMutator.h"
[51b73452]	29	#include "PolyMutator.h"
	30	#include "FindFunction.h"
[6635c74]	31	#include "ScopedMap.h"
[89173242]	32	#include "ScopedSet.h"
[51b73452]	33	#include "ScrubTyVars.h"
	34
[68cd1ce]	35	#include "Parser/ParseNode.h"
	36
[cdec5af]	37	#include "SynTree/Constant.h"
[4e284ea6]	38	#include "SynTree/Declaration.h"
[51b73452]	39	#include "SynTree/Expression.h"
	40	#include "SynTree/Initializer.h"
	41	#include "SynTree/Mutator.h"
[4e284ea6]	42	#include "SynTree/Statement.h"
	43	#include "SynTree/Type.h"
	44	#include "SynTree/TypeSubstitution.h"
[68cd1ce]	45
[51b73452]	46	#include "ResolvExpr/TypeEnvironment.h"
[dc12481]	47	#include "ResolvExpr/TypeMap.h"
	48	#include "ResolvExpr/typeops.h"
[68cd1ce]	49
[4e284ea6]	50	#include "SymTab/Indexer.h"
[51b73452]	51	#include "SymTab/Mangler.h"
	52
[d3b7937]	53	#include "Common/SemanticError.h"
	54	#include "Common/UniqueName.h"
	55	#include "Common/utility.h"
[51b73452]	56
	57	#include <ext/functional> // temporary
	58
	59	namespace GenPoly {
[01aeade]	60	namespace {
	61	const std::list<Label> noLabels;
	62
[e56cfdb0]	63	FunctionType makeAdapterType( FunctionType adaptee, const TyVarMap &tyVars );
	64
[d1caa6c]	65	/// Abstracts type equality for a list of parameter types
	66	struct TypeList {
	67	TypeList() : params() {}
	68	TypeList( const std::list< Type* > &_params ) : params() { cloneAll(_params, params); }
	69	TypeList( std::list< Type* > &&_params ) : params( _params ) {}
[4e284ea6]	70
[d1caa6c]	71	TypeList( const TypeList &that ) : params() { cloneAll(that.params, params); }
	72	TypeList( TypeList &&that ) : params( std::move( that.params ) ) {}
[4e284ea6]	73
	74	/// Extracts types from a list of TypeExpr*
[d1caa6c]	75	TypeList( const std::list< TypeExpr* >& _params ) : params() {
[4e284ea6]	76	for ( std::list< TypeExpr* >::const_iterator param = _params.begin(); param != _params.end(); ++param ) {
	77	params.push_back( (*param)->get_type()->clone() );
	78	}
	79	}
	80
[d1caa6c]	81	TypeList& operator= ( const TypeList &that ) {
[4e284ea6]	82	deleteAll( params );
	83
[d1caa6c]	84	params.clear();
[4e284ea6]	85	cloneAll( that.params, params );
	86
	87	return *this;
	88	}
	89
[d1caa6c]	90	TypeList& operator= ( TypeList &&that ) {
	91	deleteAll( params );
[4e284ea6]	92
[d1caa6c]	93	params = std::move( that.params );
[4e284ea6]	94
[d1caa6c]	95	return *this;
	96	}
	97
	98	~TypeList() { deleteAll( params ); }
	99
	100	bool operator== ( const TypeList& that ) const {
[4e284ea6]	101	if ( params.size() != that.params.size() ) return false;
[d1caa6c]	102
	103	SymTab::Indexer dummy;
[4e284ea6]	104	for ( std::list< Type* >::const_iterator it = params.begin(), jt = that.params.begin(); it != params.end(); ++it, ++jt ) {
	105	if ( ! ResolvExpr::typesCompatible( it, jt, dummy ) ) return false;
	106	}
	107	return true;
	108	}
	109
	110	std::list< Type* > params; ///< Instantiation parameters
	111	};
	112
[d1caa6c]	113	/// Maps a key and a TypeList to the some value, accounting for scope
	114	template< typename Key, typename Value >
[4e284ea6]	115	class InstantiationMap {
[d1caa6c]	116	/// Wraps value for a specific (Key, TypeList) combination
	117	typedef std::pair< TypeList, Value* > Instantiation;
[0531b5d]	118	/// List of TypeLists paired with their appropriate values
	119	typedef std::vector< Instantiation > ValueList;
	120	/// Underlying map type; maps keys to a linear list of corresponding TypeLists and values
[89173242]	121	typedef ScopedMap< Key*, ValueList > InnerMap;
[4e284ea6]	122
[0531b5d]	123	InnerMap instantiations; ///< instantiations
[4e284ea6]	124
	125	public:
	126	/// Starts a new scope
[0531b5d]	127	void beginScope() { instantiations.beginScope(); }
[4e284ea6]	128
	129	/// Ends a scope
[0531b5d]	130	void endScope() { instantiations.endScope(); }
[4e284ea6]	131
[d1caa6c]	132	/// Gets the value for the (key, typeList) pair, returns NULL on none such.
[0531b5d]	133	Value lookup( Key key, const std::list< TypeExpr* >& params ) const {
	134	TypeList typeList( params );
[4e284ea6]	135
[0531b5d]	136	// scan scopes for matches to the key
	137	for ( typename InnerMap::const_iterator insts = instantiations.find( key ); insts != instantiations.end(); insts = instantiations.findNext( insts, key ) ) {
	138	for ( typename ValueList::const_reverse_iterator inst = insts->second.rbegin(); inst != insts->second.rend(); ++inst ) {
[d1caa6c]	139	if ( inst->first == typeList ) return inst->second;
[4e284ea6]	140	}
	141	}
[0531b5d]	142	// no matching instantiations found
[4e284ea6]	143	return 0;
	144	}
	145
[d1caa6c]	146	/// Adds a value for a (key, typeList) pair to the current scope
	147	void insert( Key key, const std::list< TypeExpr > &params, Value *value ) {
[0531b5d]	148	instantiations[ key ].push_back( Instantiation( TypeList( params ), value ) );
[4e284ea6]	149	}
	150	};
	151
[9d7b3ea]	152	/// Adds layout-generation functions to polymorphic types
	153	class LayoutFunctionBuilder : public DeclMutator {
	154	unsigned int functionNesting; // current level of nested functions
	155	public:
	156	LayoutFunctionBuilder() : functionNesting( 0 ) {}
	157
	158	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
	159	virtual Declaration mutate( StructDecl structDecl );
	160	virtual Declaration mutate( UnionDecl unionDecl );
	161	};
[70a06f6]	162
[f8b961b]	163	/// Replaces polymorphic return types with out-parameters, replaces calls to polymorphic functions with adapter calls as needed, and adds appropriate type variables to the function call
[01aeade]	164	class Pass1 : public PolyMutator {
	165	public:
	166	Pass1();
	167	virtual Expression mutate( ApplicationExpr appExpr );
	168	virtual Expression mutate( AddressExpr addrExpr );
	169	virtual Expression mutate( UntypedExpr expr );
	170	virtual DeclarationWithType* mutate( FunctionDecl *functionDecl );
	171	virtual TypeDecl mutate( TypeDecl typeDecl );
	172	virtual Expression mutate( CommaExpr commaExpr );
	173	virtual Expression mutate( ConditionalExpr condExpr );
[cf16f94]	174	virtual Statement * mutate( ReturnStmt *returnStmt );
[01aeade]	175	virtual Type mutate( PointerType pointerType );
[cf16f94]	176	virtual Type * mutate( FunctionType *functionType );
[ae63a18]	177
[01aeade]	178	virtual void doBeginScope();
	179	virtual void doEndScope();
	180	private:
[5c52b06]	181	/// Pass the extra type parameters from polymorphic generic arguments or return types into a function application
	182	void passArgTypeVars( ApplicationExpr appExpr, Type parmType, Type argBaseType, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars, std::set< std::string > &seenTypes );
[05d47278]	183	/// passes extra type parameters into a polymorphic function application
[5c52b06]	184	void passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars );
[48ca586]	185	/// wraps a function application with a new temporary for the out-parameter return value
[01aeade]	186	Expression addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg );
[48ca586]	187	/// Replaces all the type parameters of a generic type with their concrete equivalents under the current environment
	188	void replaceParametersWithConcrete( ApplicationExpr appExpr, std::list< Expression >& params );
	189	/// Replaces a polymorphic type with its concrete equivalant under the current environment (returns itself if concrete).
	190	/// If `doClone` is set to false, will not clone interior types
	191	Type replaceWithConcrete( ApplicationExpr appExpr, Type *type, bool doClone = true );
	192	/// wraps a function application returning a polymorphic type with a new temporary for the out-parameter return value
	193	Expression addPolyRetParam( ApplicationExpr appExpr, FunctionType function, ReferenceToType polyType, std::list< Expression *>::iterator &arg );
[01aeade]	194	Expression applyAdapter( ApplicationExpr appExpr, FunctionType function, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars );
	195	void boxParam( Type formal, Expression &arg, const TyVarMap &exprTyVars );
	196	void boxParams( ApplicationExpr appExpr, FunctionType function, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars );
	197	void addInferredParams( ApplicationExpr appExpr, FunctionType functionType, std::list< Expression *>::iterator &arg, const TyVarMap &tyVars );
[1194734]	198	/// Stores assignment operators from assertion list in local map of assignment operations
[01aeade]	199	void findAssignOps( const std::list< TypeDecl *> &forall );
	200	void passAdapters( ApplicationExpr appExpr, FunctionType functionType, const TyVarMap &exprTyVars );
	201	FunctionDecl makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars );
[05d47278]	202	/// Replaces intrinsic operator functions with their arithmetic desugaring
[01aeade]	203	Expression handleIntrinsics( ApplicationExpr appExpr );
[05d47278]	204	/// Inserts a new temporary variable into the current scope with an auto-generated name
[01aeade]	205	ObjectDecl makeTemporary( Type type );
[c29d9ce]	206
[63c0dbf]	207	ScopedMap< std::string, DeclarationWithType *> assignOps; ///< Currently known type variable assignment operators
[89173242]	208	ResolvExpr::TypeMap< DeclarationWithType > scopedAssignOps; ///< Currently known assignment operators
	209	ScopedMap< std::string, DeclarationWithType* > adapters; ///< Set of adapter functions in the current scope
[70a06f6]	210
[01aeade]	211	DeclarationWithType *retval;
	212	bool useRetval;
	213	UniqueName tempNamer;
	214	};
	215
[89173242]	216	/// * Moves polymorphic returns in function types to pointer-type parameters
	217	/// * adds type size and assertion parameters to parameter lists
[01aeade]	218	class Pass2 : public PolyMutator {
	219	public:
	220	template< typename DeclClass >
	221	DeclClass handleDecl( DeclClass decl, Type *type );
	222	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
	223	virtual ObjectDecl mutate( ObjectDecl objectDecl );
	224	virtual TypeDecl mutate( TypeDecl typeDecl );
	225	virtual TypedefDecl mutate( TypedefDecl typedefDecl );
	226	virtual Type mutate( PointerType pointerType );
	227	virtual Type mutate( FunctionType funcType );
[70a06f6]	228
[01aeade]	229	private:
	230	void addAdapters( FunctionType *functionType );
[ae63a18]	231
[01aeade]	232	std::map< UniqueId, std::string > adapterName;
	233	};
	234
[4e284ea6]	235	/// Mutator pass that replaces concrete instantiations of generic types with actual struct declarations, scoped appropriately
	236	class GenericInstantiator : public DeclMutator {
	237	/// Map of (generic type, parameter list) pairs to concrete type instantiations
[d1caa6c]	238	InstantiationMap< AggregateDecl, AggregateDecl > instantiations;
[4e284ea6]	239	/// Namer for concrete types
	240	UniqueName typeNamer;
	241
	242	public:
	243	GenericInstantiator() : DeclMutator(), instantiations(), typeNamer("_conc_") {}
	244
	245	virtual Type* mutate( StructInstType *inst );
	246	virtual Type* mutate( UnionInstType *inst );
	247
	248	// virtual Expression* mutate( MemberExpr *memberExpr );
	249
	250	virtual void doBeginScope();
	251	virtual void doEndScope();
	252	private:
	253	/// Wrap instantiation lookup for structs
	254	StructDecl* lookup( StructInstType inst, const std::list< TypeExpr > &typeSubs ) { return (StructDecl*)instantiations.lookup( inst->get_baseStruct(), typeSubs ); }
	255	/// Wrap instantiation lookup for unions
	256	UnionDecl* lookup( UnionInstType inst, const std::list< TypeExpr > &typeSubs ) { return (UnionDecl*)instantiations.lookup( inst->get_baseUnion(), typeSubs ); }
	257	/// Wrap instantiation insertion for structs
	258	void insert( StructInstType inst, const std::list< TypeExpr > &typeSubs, StructDecl *decl ) { instantiations.insert( inst->get_baseStruct(), typeSubs, decl ); }
	259	/// Wrap instantiation insertion for unions
	260	void insert( UnionInstType inst, const std::list< TypeExpr > &typeSubs, UnionDecl *decl ) { instantiations.insert( inst->get_baseUnion(), typeSubs, decl ); }
	261	};
	262
[8a34677]	263	/// Replaces member and size/align/offsetof expressions on polymorphic generic types with calculated expressions.
	264	/// * Replaces member expressions for polymorphic types with calculated add-field-offset-and-dereference
	265	/// * Calculates polymorphic offsetof expressions from offset array
	266	/// * Inserts dynamic calculation of polymorphic type layouts where needed
	267	class PolyGenericCalculator : public PolyMutator {
	268	public:
[05d47278]	269	template< typename DeclClass >
	270	DeclClass handleDecl( DeclClass decl, Type *type );
	271	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
	272	virtual ObjectDecl mutate( ObjectDecl objectDecl );
	273	virtual TypedefDecl mutate( TypedefDecl objectDecl );
	274	virtual TypeDecl mutate( TypeDecl objectDecl );
	275	virtual Statement mutate( DeclStmt declStmt );
	276	virtual Type mutate( PointerType pointerType );
	277	virtual Type mutate( FunctionType funcType );
	278	virtual Expression mutate( MemberExpr memberExpr );
[8a34677]	279	virtual Expression mutate( SizeofExpr sizeofExpr );
	280	virtual Expression mutate( AlignofExpr alignofExpr );
[2a4b088]	281	virtual Expression mutate( OffsetofExpr offsetofExpr );
[8a34677]	282	virtual Expression mutate( OffsetPackExpr offsetPackExpr );
	283
	284	virtual void doBeginScope();
	285	virtual void doEndScope();
	286
	287	private:
	288	/// Makes a new variable in the current scope with the given name, type & optional initializer
	289	ObjectDecl makeVar( const std::string &name, Type type, Initializer *init = 0 );
	290	/// returns true if the type has a dynamic layout; such a layout will be stored in appropriately-named local variables when the function returns
	291	bool findGeneric( Type *ty );
	292	/// adds type parameters to the layout call; will generate the appropriate parameters if needed
	293	void addOtypeParamsToLayoutCall( UntypedExpr layoutCall, const std::list< Type > &otypeParams );
[aa19ccf]	294
	295	/// Enters a new scope for type-variables, adding the type variables from ty
	296	void beginTypeScope( Type *ty );
	297	/// Exits the type-variable scope
	298	void endTypeScope();
[70a06f6]	299
[8a34677]	300	ScopedSet< std::string > knownLayouts; ///< Set of generic type layouts known in the current scope, indexed by sizeofName
	301	ScopedSet< std::string > knownOffsets; ///< Set of non-generic types for which the offset array exists in the current scope, indexed by offsetofName
[05d47278]	302	};
[b4cd03b7]	303
[f8b961b]	304	/// Replaces initialization of polymorphic values with alloca, declaration of dtype/ftype with appropriate void expression, and sizeof expressions of polymorphic types with the proper variable
[01aeade]	305	class Pass3 : public PolyMutator {
	306	public:
	307	template< typename DeclClass >
	308	DeclClass handleDecl( DeclClass decl, Type *type );
	309	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
	310	virtual ObjectDecl mutate( ObjectDecl objectDecl );
	311	virtual TypedefDecl mutate( TypedefDecl objectDecl );
	312	virtual TypeDecl mutate( TypeDecl objectDecl );
	313	virtual Type mutate( PointerType pointerType );
	314	virtual Type mutate( FunctionType funcType );
	315	private:
	316	};
	317
	318	} // anonymous namespace
	319
[05d47278]	320	/// version of mutateAll with special handling for translation unit so you can check the end of the prelude when debugging
	321	template< typename MutatorType >
	322	inline void mutateTranslationUnit( std::list< Declaration* > &translationUnit, MutatorType &mutator ) {
	323	bool seenIntrinsic = false;
	324	SemanticError errors;
	325	for ( typename std::list< Declaration* >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) {
	326	try {
	327	if ( *i ) {
	328	if ( (*i)->get_linkage() == LinkageSpec::Intrinsic ) {
	329	seenIntrinsic = true;
	330	} else if ( seenIntrinsic ) {
	331	seenIntrinsic = false; // break on this line when debugging for end of prelude
	332	}
[b4cd03b7]	333
[05d47278]	334	i = dynamic_cast< Declaration >( (*i)->acceptMutator( mutator ) );
	335	assert( *i );
	336	} // if
	337	} catch( SemanticError &e ) {
	338	errors.append( e );
	339	} // try
	340	} // for
	341	if ( ! errors.isEmpty() ) {
	342	throw errors;
	343	} // if
	344	}
	345
[01aeade]	346	void box( std::list< Declaration *>& translationUnit ) {
[9d7b3ea]	347	LayoutFunctionBuilder layoutBuilder;
[01aeade]	348	Pass1 pass1;
	349	Pass2 pass2;
[4e284ea6]	350	GenericInstantiator instantiator;
[8a34677]	351	PolyGenericCalculator polyCalculator;
[01aeade]	352	Pass3 pass3;
[70a06f6]	353
[9d7b3ea]	354	layoutBuilder.mutateDeclarationList( translationUnit );
[05d47278]	355	mutateTranslationUnit/All/( translationUnit, pass1 );
	356	mutateTranslationUnit/All/( translationUnit, pass2 );
[4e284ea6]	357	instantiator.mutateDeclarationList( translationUnit );
[8a34677]	358	mutateTranslationUnit/All/( translationUnit, polyCalculator );
[05d47278]	359	mutateTranslationUnit/All/( translationUnit, pass3 );
[6c3744e]	360	}
	361
[9d7b3ea]	362	////////////////////////////////// LayoutFunctionBuilder ////////////////////////////////////////////
	363
	364	DeclarationWithType LayoutFunctionBuilder::mutate( FunctionDecl functionDecl ) {
	365	functionDecl->set_functionType( maybeMutate( functionDecl->get_functionType(), *this ) );
	366	mutateAll( functionDecl->get_oldDecls(), *this );
	367	++functionNesting;
	368	functionDecl->set_statements( maybeMutate( functionDecl->get_statements(), *this ) );
	369	--functionNesting;
	370	return functionDecl;
	371	}
[70a06f6]	372
[9d7b3ea]	373	/// Get a list of type declarations that will affect a layout function
	374	std::list< TypeDecl* > takeOtypeOnly( std::list< TypeDecl* > &decls ) {
	375	std::list< TypeDecl * > otypeDecls;
	376
	377	for ( std::list< TypeDecl* >::const_iterator decl = decls.begin(); decl != decls.end(); ++decl ) {
[3627356]	378	if ( (*decl)->get_kind() == TypeDecl::Any ) {
[9d7b3ea]	379	otypeDecls.push_back( *decl );
	380	}
	381	}
[70a06f6]	382
[9d7b3ea]	383	return otypeDecls;
	384	}
	385
	386	/// Adds parameters for otype layout to a function type
	387	void addOtypeParams( FunctionType layoutFnType, std::list< TypeDecl > &otypeParams ) {
	388	BasicType sizeAlignType( Type::Qualifiers(), BasicType::LongUnsignedInt );
[70a06f6]	389
[9d7b3ea]	390	for ( std::list< TypeDecl* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
[2e60a1a]	391	TypeInstType paramType( Type::Qualifiers(), (param)->get_name(), param );
[adc6781]	392	std::string paramName = mangleType( &paramType );
	393	layoutFnType->get_parameters().push_back( new ObjectDecl( sizeofName( paramName ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
	394	layoutFnType->get_parameters().push_back( new ObjectDecl( alignofName( paramName ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
[9d7b3ea]	395	}
	396	}
	397
	398	/// Builds a layout function declaration
[adc6781]	399	FunctionDecl buildLayoutFunctionDecl( AggregateDecl typeDecl, unsigned int functionNesting, FunctionType *layoutFnType ) {
[9d7b3ea]	400	// Routines at global scope marked "static" to prevent multiple definitions is separate translation units
	401	// because each unit generates copies of the default routines for each aggregate.
	402	FunctionDecl *layoutDecl = new FunctionDecl(
[adc6781]	403	layoutofName( typeDecl ), functionNesting > 0 ? DeclarationNode::NoStorageClass : DeclarationNode::Static, LinkageSpec::AutoGen, layoutFnType, new CompoundStmt( noLabels ), true, false );
[9d7b3ea]	404	layoutDecl->fixUniqueId();
	405	return layoutDecl;
	406	}
	407
	408	/// Makes a unary operation
	409	Expression makeOp( const std::string &name, Expression arg ) {
	410	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
	411	expr->get_args().push_back( arg );
	412	return expr;
	413	}
	414
	415	/// Makes a binary operation
	416	Expression makeOp( const std::string &name, Expression lhs, Expression *rhs ) {
	417	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
	418	expr->get_args().push_back( lhs );
	419	expr->get_args().push_back( rhs );
	420	return expr;
	421	}
	422
	423	/// Returns the dereference of a local pointer variable
	424	Expression derefVar( ObjectDecl var ) {
	425	return makeOp( "*?", new VariableExpr( var ) );
	426	}
	427
	428	/// makes an if-statement with a single-expression if-block and no then block
	429	Statement makeCond( Expression cond, Expression *ifPart ) {
[3627356]	430	return new IfStmt( noLabels, cond, new ExprStmt( noLabels, ifPart ), 0 );
[9d7b3ea]	431	}
	432
	433	/// makes a statement that assigns rhs to lhs if lhs < rhs
	434	Statement makeAssignMax( Expression lhs, Expression *rhs ) {
	435	return makeCond( makeOp( "?<?", lhs, rhs ), makeOp( "?=?", lhs->clone(), rhs->clone() ) );
	436	}
	437
	438	/// makes a statement that aligns lhs to rhs (rhs should be an integer power of two)
	439	Statement makeAlignTo( Expression lhs, Expression *rhs ) {
	440	// check that the lhs is zeroed out to the level of rhs
	441	Expression *ifCond = makeOp( "?&?", lhs, makeOp( "?-?", rhs, new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), "1" ) ) ) );
	442	// if not aligned, increment to alignment
	443	Expression *ifExpr = makeOp( "?+=?", lhs->clone(), makeOp( "?-?", rhs->clone(), ifCond->clone() ) );
	444	return makeCond( ifCond, ifExpr );
	445	}
[70a06f6]	446
[9d7b3ea]	447	/// adds an expression to a compound statement
	448	void addExpr( CompoundStmt stmts, Expression expr ) {
	449	stmts->get_kids().push_back( new ExprStmt( noLabels, expr ) );
	450	}
	451
	452	/// adds a statement to a compound statement
	453	void addStmt( CompoundStmt stmts, Statement stmt ) {
	454	stmts->get_kids().push_back( stmt );
	455	}
[70a06f6]	456
[3627356]	457	Declaration LayoutFunctionBuilder::mutate( StructDecl structDecl ) {
[9d7b3ea]	458	// do not generate layout function for "empty" tag structs
	459	if ( structDecl->get_members().empty() ) return structDecl;
	460
	461	// get parameters that can change layout, exiting early if none
	462	std::list< TypeDecl* > otypeParams = takeOtypeOnly( structDecl->get_parameters() );
	463	if ( otypeParams.empty() ) return structDecl;
	464
	465	// build layout function signature
	466	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
	467	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
	468	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
[70a06f6]	469
[adc6781]	470	ObjectDecl *sizeParam = new ObjectDecl( sizeofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
[9d7b3ea]	471	layoutFnType->get_parameters().push_back( sizeParam );
[adc6781]	472	ObjectDecl *alignParam = new ObjectDecl( alignofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
[9d7b3ea]	473	layoutFnType->get_parameters().push_back( alignParam );
[adc6781]	474	ObjectDecl *offsetParam = new ObjectDecl( offsetofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
[9d7b3ea]	475	layoutFnType->get_parameters().push_back( offsetParam );
	476	addOtypeParams( layoutFnType, otypeParams );
	477
	478	// build function decl
[adc6781]	479	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( structDecl, functionNesting, layoutFnType );
[9d7b3ea]	480
	481	// calculate struct layout in function body
	482
	483	// initialize size and alignment to 0 and 1 (will have at least one member to re-edit size
	484	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "0" ) ) ) );
	485	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
	486	unsigned long n_members = 0;
	487	bool firstMember = true;
	488	for ( std::list< Declaration* >::const_iterator member = structDecl->get_members().begin(); member != structDecl->get_members().end(); ++member ) {
	489	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
	490	assert( dwt );
[bd91e2a]	491	Type *memberType = dwt->get_type();
[9d7b3ea]	492
	493	if ( firstMember ) {
	494	firstMember = false;
	495	} else {
	496	// make sure all members after the first (automatically aligned at 0) are properly padded for alignment
[bd91e2a]	497	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), new AlignofExpr( memberType->clone() ) ) );
[9d7b3ea]	498	}
[70a06f6]	499
[9d7b3ea]	500	// place current size in the current offset index
	501	addExpr( layoutDecl->get_statements(), makeOp( "?=?", makeOp( "?[?]", new VariableExpr( offsetParam ), new ConstantExpr( Constant::from( n_members ) ) ),
	502	derefVar( sizeParam ) ) );
	503	++n_members;
	504
	505	// add member size to current size
[bd91e2a]	506	addExpr( layoutDecl->get_statements(), makeOp( "?+=?", derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
[70a06f6]	507
[9d7b3ea]	508	// take max of member alignment and global alignment
[bd91e2a]	509	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
[9d7b3ea]	510	}
	511	// make sure the type is end-padded to a multiple of its alignment
	512	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
	513
	514	addDeclarationAfter( layoutDecl );
	515	return structDecl;
	516	}
[70a06f6]	517
[3627356]	518	Declaration LayoutFunctionBuilder::mutate( UnionDecl unionDecl ) {
[9d7b3ea]	519	// do not generate layout function for "empty" tag unions
	520	if ( unionDecl->get_members().empty() ) return unionDecl;
[70a06f6]	521
[9d7b3ea]	522	// get parameters that can change layout, exiting early if none
	523	std::list< TypeDecl* > otypeParams = takeOtypeOnly( unionDecl->get_parameters() );
	524	if ( otypeParams.empty() ) return unionDecl;
	525
	526	// build layout function signature
	527	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
	528	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
	529	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
[70a06f6]	530
[adc6781]	531	ObjectDecl *sizeParam = new ObjectDecl( sizeofName( unionDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
[9d7b3ea]	532	layoutFnType->get_parameters().push_back( sizeParam );
[adc6781]	533	ObjectDecl *alignParam = new ObjectDecl( alignofName( unionDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
[9d7b3ea]	534	layoutFnType->get_parameters().push_back( alignParam );
	535	addOtypeParams( layoutFnType, otypeParams );
	536
	537	// build function decl
[adc6781]	538	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( unionDecl, functionNesting, layoutFnType );
[9d7b3ea]	539
	540	// calculate union layout in function body
	541	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
	542	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
	543	for ( std::list< Declaration* >::const_iterator member = unionDecl->get_members().begin(); member != unionDecl->get_members().end(); ++member ) {
	544	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
	545	assert( dwt );
[bd91e2a]	546	Type *memberType = dwt->get_type();
[70a06f6]	547
[9d7b3ea]	548	// take max member size and global size
[bd91e2a]	549	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
[70a06f6]	550
[9d7b3ea]	551	// take max of member alignment and global alignment
[bd91e2a]	552	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
[9d7b3ea]	553	}
	554	// make sure the type is end-padded to a multiple of its alignment
	555	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
	556
	557	addDeclarationAfter( layoutDecl );
	558	return unionDecl;
	559	}
[70a06f6]	560
[01aeade]	561	////////////////////////////////////////// Pass1 ////////////////////////////////////////////////////
	562
	563	namespace {
[bdf1954]	564	std::string makePolyMonoSuffix( FunctionType * function, const TyVarMap &tyVars ) {
	565	std::stringstream name;
	566
[ed1065c]	567	// NOTE: this function previously used isPolyObj, which failed to produce
	568	// the correct thing in some situations. It's not clear to me why this wasn't working.
	569
[ae63a18]	570	// if the return type or a parameter type involved polymorphic types, then the adapter will need
	571	// to take those polymorphic types as pointers. Therefore, there can be two different functions
[bdf1954]	572	// with the same mangled name, so we need to further mangle the names.
[ed1065c]	573	for ( std::list< DeclarationWithType *>::iterator retval = function->get_returnVals().begin(); retval != function->get_returnVals().end(); ++retval ) {
[ffad73a]	574	if ( isPolyType( (*retval)->get_type(), tyVars ) ) {
[ed1065c]	575	name << "P";
	576	} else {
	577	name << "M";
	578	}
[bdf1954]	579	}
	580	name << "_";
	581	std::list< DeclarationWithType *> &paramList = function->get_parameters();
	582	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
[ffad73a]	583	if ( isPolyType( (*arg)->get_type(), tyVars ) ) {
[bdf1954]	584	name << "P";
	585	} else {
[ae63a18]	586	name << "M";
[bdf1954]	587	}
	588	} // for
	589	return name.str();
	590	}
	591
	592	std::string mangleAdapterName( FunctionType * function, const TyVarMap &tyVars ) {
	593	return SymTab::Mangler::mangle( function ) + makePolyMonoSuffix( function, tyVars );
	594	}
	595
[01aeade]	596	std::string makeAdapterName( const std::string &mangleName ) {
	597	return "_adapter" + mangleName;
	598	}
[6c3744e]	599
[6635c74]	600	Pass1::Pass1() : useRetval( false ), tempNamer( "_temp" ) {}
[01aeade]	601
[dc12481]	602	/// Returns T if the given declaration is (?=?)(T , T) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
	603	TypeInstType isTypeInstAssignment( DeclarationWithType decl ) {
[01aeade]	604	if ( decl->get_name() == "?=?" ) {
[1194734]	605	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
	606	if ( funType->get_parameters().size() == 2 ) {
	607	if ( PointerType pointer = dynamic_cast< PointerType >( funType->get_parameters().front()->get_type() ) ) {
[dc12481]	608	if ( TypeInstType refType = dynamic_cast< TypeInstType >( pointer->get_base() ) ) {
	609	if ( TypeInstType refType2 = dynamic_cast< TypeInstType >( funType->get_parameters().back()->get_type() ) ) {
[1194734]	610	if ( refType->get_name() == refType2->get_name() ) {
	611	return refType;
[cf16f94]	612	} // if
[01aeade]	613	} // if
	614	} // if
	615	} // if
	616	} // if
	617	} // if
	618	} // if
[1194734]	619	return 0;
[01aeade]	620	}
[70a06f6]	621
[dc12481]	622	/// returns T if the given declaration is: (?=?)(T , T) for some type T (return not checked, but maybe should be), NULL otherwise
	623	/// Only picks assignments where neither parameter is cv-qualified
	624	Type isAssignment( DeclarationWithType decl ) {
	625	if ( decl->get_name() == "?=?" ) {
	626	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
	627	if ( funType->get_parameters().size() == 2 ) {
	628	Type::Qualifiers defaultQualifiers;
	629	Type *paramType1 = funType->get_parameters().front()->get_type();
	630	if ( paramType1->get_qualifiers() != defaultQualifiers ) return 0;
	631	Type *paramType2 = funType->get_parameters().back()->get_type();
	632	if ( paramType2->get_qualifiers() != defaultQualifiers ) return 0;
[70a06f6]	633
[dc12481]	634	if ( PointerType pointerType = dynamic_cast< PointerType >( paramType1 ) ) {
	635	Type *baseType1 = pointerType->get_base();
	636	if ( baseType1->get_qualifiers() != defaultQualifiers ) return 0;
	637	SymTab::Indexer dummy;
	638	if ( ResolvExpr::typesCompatible( baseType1, paramType2, dummy ) ) {
	639	return baseType1;
	640	} // if
	641	} // if
	642	} // if
	643	} // if
	644	} // if
	645	return 0;
	646	}
[01aeade]	647
	648	void Pass1::findAssignOps( const std::list< TypeDecl *> &forall ) {
[ed1065c]	649	// what if a nested function uses an assignment operator?
	650	// assignOps.clear();
[01aeade]	651	for ( std::list< TypeDecl *>::const_iterator i = forall.begin(); i != forall.end(); ++i ) {
	652	for ( std::list< DeclarationWithType >::const_iterator assert = (i)->get_assertions().begin(); assert != (*i)->get_assertions().end(); ++assert ) {
	653	std::string typeName;
[dc12481]	654	if ( TypeInstType typeInst = isTypeInstAssignment( assert ) ) {
[1194734]	655	assignOps[ typeInst->get_name() ] = *assert;
[01aeade]	656	} // if
	657	} // for
	658	} // for
	659	}
	660
[82dd287]	661	DeclarationWithType Pass1::mutate( FunctionDecl functionDecl ) {
[89173242]	662	// if this is a assignment function, put it in the map for this scope
[dc12481]	663	if ( Type *assignedType = isAssignment( functionDecl ) ) {
	664	if ( ! dynamic_cast< TypeInstType* >( assignedType ) ) {
	665	scopedAssignOps.insert( assignedType, functionDecl );
[1194734]	666	}
	667	}
[b4cd03b7]	668
[e56cfdb0]	669	if ( functionDecl->get_statements() ) { // empty routine body ?
	670	doBeginScope();
[4b8f918]	671	scopeTyVars.beginScope();
[63c0dbf]	672	assignOps.beginScope();
[01aeade]	673	DeclarationWithType *oldRetval = retval;
	674	bool oldUseRetval = useRetval;
[e56cfdb0]	675
	676	// process polymorphic return value
[01aeade]	677	retval = 0;
[aadc9a4]	678	if ( isPolyRet( functionDecl->get_functionType() ) && functionDecl->get_linkage() == LinkageSpec::Cforall ) {
[01aeade]	679	retval = functionDecl->get_functionType()->get_returnVals().front();
[ae63a18]	680
[01aeade]	681	// give names to unnamed return values
	682	if ( retval->get_name() == "" ) {
	683	retval->set_name( "_retparm" );
	684	retval->set_linkage( LinkageSpec::C );
	685	} // if
	686	} // if
[ae63a18]	687
[e56cfdb0]	688	FunctionType *functionType = functionDecl->get_functionType();
[01aeade]	689	makeTyVarMap( functionDecl->get_functionType(), scopeTyVars );
	690	findAssignOps( functionDecl->get_functionType()->get_forall() );
[e56cfdb0]	691
	692	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
	693	std::list< FunctionType *> functions;
	694	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
	695	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
	696	findFunction( (*assert)->get_type(), functions, scopeTyVars, needsAdapter );
	697	} // for
	698	} // for
	699	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
	700	findFunction( (*arg)->get_type(), functions, scopeTyVars, needsAdapter );
	701	} // for
[b4cd03b7]	702
[e56cfdb0]	703	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
[bdf1954]	704	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
[e56cfdb0]	705	if ( adapters.find( mangleName ) == adapters.end() ) {
	706	std::string adapterName = makeAdapterName( mangleName );
	707	adapters.insert( std::pair< std::string, DeclarationWithType >( mangleName, new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( funType, scopeTyVars ) ), 0 ) ) );
	708	} // if
	709	} // for
	710
[01aeade]	711	functionDecl->set_statements( functionDecl->get_statements()->acceptMutator( *this ) );
[ae63a18]	712
[6f49cdf]	713	scopeTyVars.endScope();
[63c0dbf]	714	assignOps.endScope();
[01aeade]	715	retval = oldRetval;
	716	useRetval = oldUseRetval;
[e56cfdb0]	717	doEndScope();
[01aeade]	718	} // if
	719	return functionDecl;
	720	}
[6c3744e]	721
[01aeade]	722	TypeDecl Pass1::mutate( TypeDecl typeDecl ) {
	723	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
	724	return Mutator::mutate( typeDecl );
	725	}
[6c3744e]	726
[01aeade]	727	Expression Pass1::mutate( CommaExpr commaExpr ) {
	728	bool oldUseRetval = useRetval;
	729	useRetval = false;
	730	commaExpr->set_arg1( maybeMutate( commaExpr->get_arg1(), *this ) );
	731	useRetval = oldUseRetval;
	732	commaExpr->set_arg2( maybeMutate( commaExpr->get_arg2(), *this ) );
	733	return commaExpr;
	734	}
[6c3744e]	735
[01aeade]	736	Expression Pass1::mutate( ConditionalExpr condExpr ) {
	737	bool oldUseRetval = useRetval;
	738	useRetval = false;
	739	condExpr->set_arg1( maybeMutate( condExpr->get_arg1(), *this ) );
	740	useRetval = oldUseRetval;
	741	condExpr->set_arg2( maybeMutate( condExpr->get_arg2(), *this ) );
	742	condExpr->set_arg3( maybeMutate( condExpr->get_arg3(), *this ) );
	743	return condExpr;
[6c3744e]	744
[01aeade]	745	}
[6c3744e]	746
[5c52b06]	747	void Pass1::passArgTypeVars( ApplicationExpr appExpr, Type parmType, Type argBaseType, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars, std::set< std::string > &seenTypes ) {
[4b8f918]	748	Type *polyType = isPolyType( parmType, exprTyVars );
	749	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
	750	std::string typeName = mangleType( polyType );
[adc6781]	751	if ( seenTypes.count( typeName ) ) return;
[5c52b06]	752
	753	arg = appExpr->get_args().insert( arg, new SizeofExpr( argBaseType->clone() ) );
	754	arg++;
	755	arg = appExpr->get_args().insert( arg, new AlignofExpr( argBaseType->clone() ) );
	756	arg++;
[4b8f918]	757	if ( dynamic_cast< StructInstType* >( polyType ) ) {
[5c52b06]	758	if ( StructInstType argBaseStructType = dynamic_cast< StructInstType >( argBaseType ) ) {
[89173242]	759	// zero-length arrays are forbidden by C, so don't pass offset for empty struct
	760	if ( ! argBaseStructType->get_baseStruct()->get_members().empty() ) {
[d75038c]	761	arg = appExpr->get_args().insert( arg, new OffsetPackExpr( argBaseStructType->clone() ) );
[89173242]	762	arg++;
	763	}
[5c52b06]	764	} else {
	765	throw SemanticError( "Cannot pass non-struct type for generic struct" );
	766	}
	767	}
	768
[adc6781]	769	seenTypes.insert( typeName );
[5c52b06]	770	}
	771	}
	772
	773	void Pass1::passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
[7754cde]	774	// pass size/align for type variables
[01aeade]	775	for ( TyVarMap::const_iterator tyParm = exprTyVars.begin(); tyParm != exprTyVars.end(); ++tyParm ) {
	776	ResolvExpr::EqvClass eqvClass;
	777	assert( env );
	778	if ( tyParm->second == TypeDecl::Any ) {
	779	Type *concrete = env->lookup( tyParm->first );
	780	if ( concrete ) {
	781	arg = appExpr->get_args().insert( arg, new SizeofExpr( concrete->clone() ) );
	782	arg++;
[db0b3ce]	783	arg = appExpr->get_args().insert( arg, new AlignofExpr( concrete->clone() ) );
	784	arg++;
[01aeade]	785	} else {
[dc2e7e0]	786	/// xxx - should this be an assertion?
[01aeade]	787	throw SemanticError( "unbound type variable in application ", appExpr );
	788	} // if
	789	} // if
	790	} // for
[7754cde]	791
	792	// add size/align for generic types to parameter list
	793	if ( appExpr->get_function()->get_results().empty() ) return;
	794	FunctionType *funcType = getFunctionType( appExpr->get_function()->get_results().front() );
	795	assert( funcType );
[ae63a18]	796
[7754cde]	797	std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin();
	798	std::list< Expression* >::const_iterator fnArg = arg;
[69911c11]	799	std::set< std::string > seenTypes; //< names for generic types we've seen
[7754cde]	800
[5c52b06]	801	// a polymorphic return type may need to be added to the argument list
	802	if ( polyRetType ) {
	803	Type *concRetType = replaceWithConcrete( appExpr, polyRetType );
	804	passArgTypeVars( appExpr, polyRetType, concRetType, arg, exprTyVars, seenTypes );
	805	}
[70a06f6]	806
[5c52b06]	807	// add type information args for presently unseen types in parameter list
	808	for ( ; fnParm != funcType->get_parameters().end() && fnArg != appExpr->get_args().end(); ++fnParm, ++fnArg ) {
	809	VariableExpr fnArgBase = getBaseVar( fnArg );
	810	if ( ! fnArgBase \|\| fnArgBase->get_results().empty() ) continue;
	811	passArgTypeVars( appExpr, (*fnParm)->get_type(), fnArgBase->get_results().front(), arg, exprTyVars, seenTypes );
[7754cde]	812	}
[01aeade]	813	}
[6c3744e]	814
[01aeade]	815	ObjectDecl Pass1::makeTemporary( Type type ) {
[68cd1ce]	816	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, 0 );
[01aeade]	817	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
	818	return newObj;
	819	}
[6c3744e]	820
[01aeade]	821	Expression Pass1::addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg ) {
[cf16f94]	822	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
	823	// if ( useRetval ) {
	824	// assert( retval );
	825	// arg = appExpr->get_args().insert( arg, new VariableExpr( retval ) );
	826	// arg++;
	827	// } else {
	828
	829	// Create temporary to hold return value of polymorphic function and produce that temporary as a result
	830	// using a comma expression. Possibly change comma expression into statement expression "{}" for multiple
	831	// return values.
	832	ObjectDecl *newObj = makeTemporary( retType->clone() );
	833	Expression *paramExpr = new VariableExpr( newObj );
[5c52b06]	834
	835	// If the type of the temporary is not polymorphic, box temporary by taking its address;
	836	// otherwise the temporary is already boxed and can be used directly.
[5f6c42c]	837	if ( ! isPolyType( newObj->get_type(), scopeTyVars, env ) ) {
[cf16f94]	838	paramExpr = new AddressExpr( paramExpr );
[01aeade]	839	} // if
[cf16f94]	840	arg = appExpr->get_args().insert( arg, paramExpr ); // add argument to function call
	841	arg++;
	842	// Build a comma expression to call the function and emulate a normal return.
	843	CommaExpr *commaExpr = new CommaExpr( appExpr, new VariableExpr( newObj ) );
	844	commaExpr->set_env( appExpr->get_env() );
	845	appExpr->set_env( 0 );
	846	return commaExpr;
	847	// } // if
	848	// return appExpr;
[01aeade]	849	}
[6c3744e]	850
[48ca586]	851	void Pass1::replaceParametersWithConcrete( ApplicationExpr appExpr, std::list< Expression >& params ) {
	852	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
	853	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
	854	assert(paramType && "Aggregate parameters should be type expressions");
	855	paramType->set_type( replaceWithConcrete( appExpr, paramType->get_type(), false ) );
	856	}
	857	}
[b4cd03b7]	858
[48ca586]	859	Type Pass1::replaceWithConcrete( ApplicationExpr appExpr, Type *type, bool doClone ) {
	860	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
	861	Type *concrete = env->lookup( typeInst->get_name() );
	862	if ( concrete == 0 ) {
	863	throw SemanticError( "Unbound type variable " + typeInst->get_name() + " in ", appExpr );
	864	} // if
	865	return concrete;
	866	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
	867	if ( doClone ) {
	868	structType = structType->clone();
	869	}
	870	replaceParametersWithConcrete( appExpr, structType->get_parameters() );
	871	return structType;
	872	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
	873	if ( doClone ) {
	874	unionType = unionType->clone();
	875	}
	876	replaceParametersWithConcrete( appExpr, unionType->get_parameters() );
	877	return unionType;
	878	}
	879	return type;
	880	}
	881
	882	Expression Pass1::addPolyRetParam( ApplicationExpr appExpr, FunctionType function, ReferenceToType polyType, std::list< Expression *>::iterator &arg ) {
[01aeade]	883	assert( env );
[48ca586]	884	Type *concrete = replaceWithConcrete( appExpr, polyType );
[70a06f6]	885	// add out-parameter for return value
[01aeade]	886	return addRetParam( appExpr, function, concrete, arg );
	887	}
[6c3744e]	888
[01aeade]	889	Expression Pass1::applyAdapter( ApplicationExpr appExpr, FunctionType function, std::list< Expression >::iterator &arg, const TyVarMap &tyVars ) {
	890	Expression *ret = appExpr;
[ffad73a]	891	if ( ! function->get_returnVals().empty() && isPolyType( function->get_returnVals().front()->get_type(), tyVars ) ) {
[01aeade]	892	ret = addRetParam( appExpr, function, function->get_returnVals().front()->get_type(), arg );
	893	} // if
[bdf1954]	894	std::string mangleName = mangleAdapterName( function, tyVars );
[01aeade]	895	std::string adapterName = makeAdapterName( mangleName );
[b1a6d6b]	896
[b4cd03b7]	897	// cast adaptee to void (*)(), since it may have any type inside a polymorphic function
	898	Type * adapteeType = new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) );
	899	appExpr->get_args().push_front( new CastExpr( appExpr->get_function(), adapteeType ) );
[01aeade]	900	appExpr->set_function( new NameExpr( adapterName ) );
[ae63a18]	901
[01aeade]	902	return ret;
	903	}
[6c3744e]	904
[01aeade]	905	void Pass1::boxParam( Type param, Expression &arg, const TyVarMap &exprTyVars ) {
	906	assert( ! arg->get_results().empty() );
[1cced28]	907	if ( isPolyType( param, exprTyVars ) ) {
[9407ed8]	908	if ( isPolyType( arg->get_results().front() ) ) {
	909	// if the argument's type is polymorphic, we don't need to box again!
[01aeade]	910	return;
	911	} else if ( arg->get_results().front()->get_isLvalue() ) {
[b3ab8f0]	912	// VariableExpr and MemberExpr are lvalues; need to check this isn't coming from the second arg of a comma expression though (not an lvalue)
	913	if ( CommaExpr commaArg = dynamic_cast< CommaExpr >( arg ) ) {
[bc1ab61]	914	commaArg->set_arg2( new AddressExpr( commaArg->get_arg2() ) );
[b3ab8f0]	915	} else {
	916	arg = new AddressExpr( arg );
	917	}
[01aeade]	918	} else {
[bd85400]	919	// use type computed in unification to declare boxed variables
	920	Type * newType = param->clone();
	921	if ( env ) env->apply( newType );
	922	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, newType, 0 );
[f6d7e0f]	923	newObj->get_type()->get_qualifiers() = Type::Qualifiers(); // TODO: is this right???
[01aeade]	924	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
	925	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
	926	assign->get_args().push_back( new VariableExpr( newObj ) );
	927	assign->get_args().push_back( arg );
	928	stmtsToAdd.push_back( new ExprStmt( noLabels, assign ) );
	929	arg = new AddressExpr( new VariableExpr( newObj ) );
	930	} // if
	931	} // if
	932	}
[6c3744e]	933
[b4cd03b7]	934	/// cast parameters to polymorphic functions so that types are replaced with
	935	/// void * if they are type parameters in the formal type.
	936	/// this gets rid of warnings from gcc.
[01aeade]	937	void addCast( Expression &actual, Type formal, const TyVarMap &tyVars ) {
[b4cd03b7]	938	Type * newType = formal->clone();
	939	if ( getFunctionType( newType ) ) {
	940	newType = ScrubTyVars::scrub( newType, tyVars );
[01aeade]	941	actual = new CastExpr( actual, newType );
	942	} // if
	943	}
[6c3744e]	944
[01aeade]	945	void Pass1::boxParams( ApplicationExpr appExpr, FunctionType function, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
	946	for ( std::list< DeclarationWithType *>::const_iterator param = function->get_parameters().begin(); param != function->get_parameters().end(); ++param, ++arg ) {
	947	assert( arg != appExpr->get_args().end() );
	948	addCast( arg, (param)->get_type(), exprTyVars );
	949	boxParam( (param)->get_type(), arg, exprTyVars );
	950	} // for
	951	}
[6c3744e]	952
[01aeade]	953	void Pass1::addInferredParams( ApplicationExpr appExpr, FunctionType functionType, std::list< Expression *>::iterator &arg, const TyVarMap &tyVars ) {
	954	std::list< Expression *>::iterator cur = arg;
	955	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
	956	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
	957	InferredParams::const_iterator inferParam = appExpr->get_inferParams().find( (*assert)->get_uniqueId() );
[698664b3]	958	assert( inferParam != appExpr->get_inferParams().end() && "NOTE: Explicit casts of polymorphic functions to compatible monomorphic functions are currently unsupported" );
[01aeade]	959	Expression *newExpr = inferParam->second.expr->clone();
	960	addCast( newExpr, (*assert)->get_type(), tyVars );
	961	boxParam( (*assert)->get_type(), newExpr, tyVars );
	962	appExpr->get_args().insert( cur, newExpr );
	963	} // for
	964	} // for
	965	}
[6c3744e]	966
[01aeade]	967	void makeRetParm( FunctionType *funcType ) {
	968	DeclarationWithType *retParm = funcType->get_returnVals().front();
[6c3744e]	969
[01aeade]	970	// make a new parameter that is a pointer to the type of the old return value
	971	retParm->set_type( new PointerType( Type::Qualifiers(), retParm->get_type() ) );
	972	funcType->get_parameters().push_front( retParm );
[6c3744e]	973
[01aeade]	974	// we don't need the return value any more
	975	funcType->get_returnVals().clear();
	976	}
[6c3744e]	977
[01aeade]	978	FunctionType makeAdapterType( FunctionType adaptee, const TyVarMap &tyVars ) {
	979	// actually make the adapter type
	980	FunctionType *adapter = adaptee->clone();
[ffad73a]	981	if ( ! adapter->get_returnVals().empty() && isPolyType( adapter->get_returnVals().front()->get_type(), tyVars ) ) {
[01aeade]	982	makeRetParm( adapter );
	983	} // if
[68cd1ce]	984	adapter->get_parameters().push_front( new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) ), 0 ) );
[01aeade]	985	return adapter;
	986	}
[6c3744e]	987
[01aeade]	988	Expression makeAdapterArg( DeclarationWithType param, DeclarationWithType arg, DeclarationWithType realParam, const TyVarMap &tyVars ) {
	989	assert( param );
	990	assert( arg );
[ffad73a]	991	if ( isPolyType( realParam->get_type(), tyVars ) ) {
[30aeb27]	992	if ( ! isPolyType( arg->get_type() ) ) {
[e56cfdb0]	993	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
	994	deref->get_args().push_back( new CastExpr( new VariableExpr( param ), new PointerType( Type::Qualifiers(), arg->get_type()->clone() ) ) );
	995	deref->get_results().push_back( arg->get_type()->clone() );
	996	return deref;
	997	} // if
[01aeade]	998	} // if
	999	return new VariableExpr( param );
	1000	}
[6c3744e]	1001
[01aeade]	1002	void addAdapterParams( ApplicationExpr adapteeApp, std::list< DeclarationWithType >::iterator arg, std::list< DeclarationWithType >::iterator param, std::list< DeclarationWithType >::iterator paramEnd, std::list< DeclarationWithType *>::iterator realParam, const TyVarMap &tyVars ) {
	1003	UniqueName paramNamer( "_p" );
	1004	for ( ; param != paramEnd; ++param, ++arg, ++realParam ) {
	1005	if ( (*param)->get_name() == "" ) {
	1006	(*param)->set_name( paramNamer.newName() );
	1007	(*param)->set_linkage( LinkageSpec::C );
	1008	} // if
	1009	adapteeApp->get_args().push_back( makeAdapterArg( param, arg, *realParam, tyVars ) );
	1010	} // for
	1011	}
[6c3744e]	1012
[01aeade]	1013	FunctionDecl Pass1::makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars ) {
	1014	FunctionType *adapterType = makeAdapterType( adaptee, tyVars );
	1015	adapterType = ScrubTyVars::scrub( adapterType, tyVars );
	1016	DeclarationWithType *adapteeDecl = adapterType->get_parameters().front();
	1017	adapteeDecl->set_name( "_adaptee" );
	1018	ApplicationExpr *adapteeApp = new ApplicationExpr( new CastExpr( new VariableExpr( adapteeDecl ), new PointerType( Type::Qualifiers(), realType ) ) );
	1019	Statement *bodyStmt;
[ae63a18]	1020
[01aeade]	1021	std::list< TypeDecl *>::iterator tyArg = realType->get_forall().begin();
	1022	std::list< TypeDecl *>::iterator tyParam = adapterType->get_forall().begin();
	1023	std::list< TypeDecl *>::iterator realTyParam = adaptee->get_forall().begin();
	1024	for ( ; tyParam != adapterType->get_forall().end(); ++tyArg, ++tyParam, ++realTyParam ) {
	1025	assert( tyArg != realType->get_forall().end() );
	1026	std::list< DeclarationWithType >::iterator assertArg = (tyArg)->get_assertions().begin();
	1027	std::list< DeclarationWithType >::iterator assertParam = (tyParam)->get_assertions().begin();
	1028	std::list< DeclarationWithType >::iterator realAssertParam = (realTyParam)->get_assertions().begin();
	1029	for ( ; assertParam != (*tyParam)->get_assertions().end(); ++assertArg, ++assertParam, ++realAssertParam ) {
	1030	assert( assertArg != (*tyArg)->get_assertions().end() );
	1031	adapteeApp->get_args().push_back( makeAdapterArg( assertParam, assertArg, *realAssertParam, tyVars ) );
	1032	} // for
	1033	} // for
[ae63a18]	1034
[01aeade]	1035	std::list< DeclarationWithType *>::iterator arg = realType->get_parameters().begin();
	1036	std::list< DeclarationWithType *>::iterator param = adapterType->get_parameters().begin();
	1037	std::list< DeclarationWithType *>::iterator realParam = adaptee->get_parameters().begin();
	1038	param++; // skip adaptee parameter
	1039	if ( realType->get_returnVals().empty() ) {
	1040	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
	1041	bodyStmt = new ExprStmt( noLabels, adapteeApp );
[ffad73a]	1042	} else if ( isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
[01aeade]	1043	if ( (*param)->get_name() == "" ) {
	1044	(*param)->set_name( "_ret" );
	1045	(*param)->set_linkage( LinkageSpec::C );
	1046	} // if
	1047	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
	1048	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
	1049	deref->get_args().push_back( new CastExpr( new VariableExpr( *param++ ), new PointerType( Type::Qualifiers(), realType->get_returnVals().front()->get_type()->clone() ) ) );
	1050	assign->get_args().push_back( deref );
	1051	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
	1052	assign->get_args().push_back( adapteeApp );
	1053	bodyStmt = new ExprStmt( noLabels, assign );
	1054	} else {
	1055	// adapter for a function that returns a monomorphic value
	1056	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
	1057	bodyStmt = new ReturnStmt( noLabels, adapteeApp );
	1058	} // if
	1059	CompoundStmt *adapterBody = new CompoundStmt( noLabels );
	1060	adapterBody->get_kids().push_back( bodyStmt );
	1061	std::string adapterName = makeAdapterName( mangleName );
[de62360d]	1062	return new FunctionDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, adapterType, adapterBody, false, false );
[01aeade]	1063	}
[6c3744e]	1064
[c29d9ce]	1065	void Pass1::passAdapters( ApplicationExpr * appExpr, FunctionType * functionType, const TyVarMap & exprTyVars ) {
[e497c1d]	1066	// collect a list of function types passed as parameters or implicit parameters (assertions)
[01aeade]	1067	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
	1068	std::list< FunctionType *> functions;
	1069	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
	1070	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
	1071	findFunction( (*assert)->get_type(), functions, exprTyVars, needsAdapter );
	1072	} // for
	1073	} // for
	1074	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
	1075	findFunction( (*arg)->get_type(), functions, exprTyVars, needsAdapter );
	1076	} // for
[e497c1d]	1077
[e56cfdb0]	1078	// parameter function types for which an appropriate adapter has been generated. we cannot use the types
	1079	// after applying substitutions, since two different parameter types may be unified to the same type
[01aeade]	1080	std::set< std::string > adaptersDone;
[e497c1d]	1081
[01aeade]	1082	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
[c29d9ce]	1083	FunctionType originalFunction = (funType)->clone();
[01aeade]	1084	FunctionType realFunction = (funType)->clone();
	1085	std::string mangleName = SymTab::Mangler::mangle( realFunction );
[e497c1d]	1086
[e56cfdb0]	1087	// only attempt to create an adapter or pass one as a parameter if we haven't already done so for this
	1088	// pre-substitution parameter function type.
[01aeade]	1089	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
[e497c1d]	1090	adaptersDone.insert( adaptersDone.begin(), mangleName );
[ae63a18]	1091
[e56cfdb0]	1092	// apply substitution to type variables to figure out what the adapter's type should look like
[e497c1d]	1093	assert( env );
	1094	env->apply( realFunction );
[ae63a18]	1095	mangleName = SymTab::Mangler::mangle( realFunction );
[bdf1954]	1096	mangleName += makePolyMonoSuffix( originalFunction, exprTyVars );
[e497c1d]	1097
[6635c74]	1098	typedef ScopedMap< std::string, DeclarationWithType* >::iterator AdapterIter;
	1099	AdapterIter adapter = adapters.find( mangleName );
[e56cfdb0]	1100	if ( adapter == adapters.end() ) {
	1101	// adapter has not been created yet in the current scope, so define it
	1102	FunctionDecl newAdapter = makeAdapter( funType, realFunction, mangleName, exprTyVars );
[6635c74]	1103	std::pair< AdapterIter, bool > answer = adapters.insert( std::pair< std::string, DeclarationWithType *>( mangleName, newAdapter ) );
	1104	adapter = answer.first;
[e56cfdb0]	1105	stmtsToAdd.push_back( new DeclStmt( noLabels, newAdapter ) );
[c29d9ce]	1106	} // if
[e56cfdb0]	1107	assert( adapter != adapters.end() );
	1108
	1109	// add the appropriate adapter as a parameter
	1110	appExpr->get_args().push_front( new VariableExpr( adapter->second ) );
[01aeade]	1111	} // if
	1112	} // for
[e56cfdb0]	1113	} // passAdapters
[6c3744e]	1114
[78dd0da]	1115	Expression makeIncrDecrExpr( ApplicationExpr appExpr, Type *polyType, bool isIncr ) {
[01aeade]	1116	NameExpr *opExpr;
	1117	if ( isIncr ) {
	1118	opExpr = new NameExpr( "?+=?" );
	1119	} else {
	1120	opExpr = new NameExpr( "?-=?" );
[6c3744e]	1121	} // if
[01aeade]	1122	UntypedExpr *addAssign = new UntypedExpr( opExpr );
	1123	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
	1124	addAssign->get_args().push_back( address->get_arg() );
	1125	} else {
	1126	addAssign->get_args().push_back( appExpr->get_args().front() );
[6c3744e]	1127	} // if
[adc6781]	1128	addAssign->get_args().push_back( new NameExpr( sizeofName( mangleType( polyType ) ) ) );
[01aeade]	1129	addAssign->get_results().front() = appExpr->get_results().front()->clone();
	1130	if ( appExpr->get_env() ) {
	1131	addAssign->set_env( appExpr->get_env() );
[6c3744e]	1132	appExpr->set_env( 0 );
	1133	} // if
[01aeade]	1134	appExpr->get_args().clear();
	1135	delete appExpr;
	1136	return addAssign;
	1137	}
	1138
	1139	Expression Pass1::handleIntrinsics( ApplicationExpr appExpr ) {
	1140	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( appExpr->get_function() ) ) {
	1141	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic ) {
	1142	if ( varExpr->get_var()->get_name() == "?[?]" ) {
	1143	assert( ! appExpr->get_results().empty() );
	1144	assert( appExpr->get_args().size() == 2 );
[ffad73a]	1145	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
	1146	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
[ae63a18]	1147	assert( ! baseType1 \|\| ! baseType2 ); // the arguments cannot both be polymorphic pointers
[01aeade]	1148	UntypedExpr *ret = 0;
[ae63a18]	1149	if ( baseType1 \|\| baseType2 ) { // one of the arguments is a polymorphic pointer
[01aeade]	1150	ret = new UntypedExpr( new NameExpr( "?+?" ) );
	1151	} // if
[ffad73a]	1152	if ( baseType1 ) {
[01aeade]	1153	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
	1154	multiply->get_args().push_back( appExpr->get_args().back() );
[adc6781]	1155	multiply->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
[01aeade]	1156	ret->get_args().push_back( appExpr->get_args().front() );
	1157	ret->get_args().push_back( multiply );
[ffad73a]	1158	} else if ( baseType2 ) {
[01aeade]	1159	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
	1160	multiply->get_args().push_back( appExpr->get_args().front() );
[adc6781]	1161	multiply->get_args().push_back( new SizeofExpr( baseType2->clone() ) );
[01aeade]	1162	ret->get_args().push_back( multiply );
	1163	ret->get_args().push_back( appExpr->get_args().back() );
	1164	} // if
[ffad73a]	1165	if ( baseType1 \|\| baseType2 ) {
[01aeade]	1166	ret->get_results().push_front( appExpr->get_results().front()->clone() );
	1167	if ( appExpr->get_env() ) {
	1168	ret->set_env( appExpr->get_env() );
	1169	appExpr->set_env( 0 );
	1170	} // if
	1171	appExpr->get_args().clear();
	1172	delete appExpr;
	1173	return ret;
	1174	} // if
	1175	} else if ( varExpr->get_var()->get_name() == "*?" ) {
	1176	assert( ! appExpr->get_results().empty() );
	1177	assert( ! appExpr->get_args().empty() );
[ffad73a]	1178	if ( isPolyType( appExpr->get_results().front(), scopeTyVars, env ) ) {
[01aeade]	1179	Expression *ret = appExpr->get_args().front();
	1180	delete ret->get_results().front();
	1181	ret->get_results().front() = appExpr->get_results().front()->clone();
	1182	if ( appExpr->get_env() ) {
	1183	ret->set_env( appExpr->get_env() );
	1184	appExpr->set_env( 0 );
	1185	} // if
	1186	appExpr->get_args().clear();
	1187	delete appExpr;
	1188	return ret;
	1189	} // if
	1190	} else if ( varExpr->get_var()->get_name() == "?++" \|\| varExpr->get_var()->get_name() == "?--" ) {
	1191	assert( ! appExpr->get_results().empty() );
	1192	assert( appExpr->get_args().size() == 1 );
[ffad73a]	1193	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
[01aeade]	1194	Type *tempType = appExpr->get_results().front()->clone();
	1195	if ( env ) {
	1196	env->apply( tempType );
	1197	} // if
	1198	ObjectDecl *newObj = makeTemporary( tempType );
	1199	VariableExpr *tempExpr = new VariableExpr( newObj );
	1200	UntypedExpr *assignExpr = new UntypedExpr( new NameExpr( "?=?" ) );
	1201	assignExpr->get_args().push_back( tempExpr->clone() );
	1202	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
	1203	assignExpr->get_args().push_back( address->get_arg()->clone() );
	1204	} else {
	1205	assignExpr->get_args().push_back( appExpr->get_args().front()->clone() );
	1206	} // if
[ffad73a]	1207	CommaExpr *firstComma = new CommaExpr( assignExpr, makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "?++" ) );
[01aeade]	1208	return new CommaExpr( firstComma, tempExpr );
	1209	} // if
	1210	} else if ( varExpr->get_var()->get_name() == "++?" \|\| varExpr->get_var()->get_name() == "--?" ) {
	1211	assert( ! appExpr->get_results().empty() );
	1212	assert( appExpr->get_args().size() == 1 );
[ffad73a]	1213	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
	1214	return makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "++?" );
[01aeade]	1215	} // if
	1216	} else if ( varExpr->get_var()->get_name() == "?+?" \|\| varExpr->get_var()->get_name() == "?-?" ) {
	1217	assert( ! appExpr->get_results().empty() );
	1218	assert( appExpr->get_args().size() == 2 );
[ffad73a]	1219	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
	1220	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
	1221	if ( baseType1 && baseType2 ) {
[01aeade]	1222	UntypedExpr *divide = new UntypedExpr( new NameExpr( "?/?" ) );
	1223	divide->get_args().push_back( appExpr );
[adc6781]	1224	divide->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
[01aeade]	1225	divide->get_results().push_front( appExpr->get_results().front()->clone() );
	1226	if ( appExpr->get_env() ) {
	1227	divide->set_env( appExpr->get_env() );
	1228	appExpr->set_env( 0 );
	1229	} // if
	1230	return divide;
[ffad73a]	1231	} else if ( baseType1 ) {
[01aeade]	1232	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
	1233	multiply->get_args().push_back( appExpr->get_args().back() );
[adc6781]	1234	multiply->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
[01aeade]	1235	appExpr->get_args().back() = multiply;
[ffad73a]	1236	} else if ( baseType2 ) {
[01aeade]	1237	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
	1238	multiply->get_args().push_back( appExpr->get_args().front() );
[adc6781]	1239	multiply->get_args().push_back( new SizeofExpr( baseType2->clone() ) );
[01aeade]	1240	appExpr->get_args().front() = multiply;
	1241	} // if
	1242	} else if ( varExpr->get_var()->get_name() == "?+=?" \|\| varExpr->get_var()->get_name() == "?-=?" ) {
	1243	assert( ! appExpr->get_results().empty() );
	1244	assert( appExpr->get_args().size() == 2 );
[ffad73a]	1245	Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env );
	1246	if ( baseType ) {
[01aeade]	1247	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
	1248	multiply->get_args().push_back( appExpr->get_args().back() );
[adc6781]	1249	multiply->get_args().push_back( new SizeofExpr( baseType->clone() ) );
[01aeade]	1250	appExpr->get_args().back() = multiply;
	1251	} // if
	1252	} // if
	1253	return appExpr;
	1254	} // if
[6c3744e]	1255	} // if
[01aeade]	1256	return 0;
	1257	}
[6c3744e]	1258
[01aeade]	1259	Expression Pass1::mutate( ApplicationExpr appExpr ) {
[e56cfdb0]	1260	// std::cerr << "mutate appExpr: ";
	1261	// for ( TyVarMap::iterator i = scopeTyVars.begin(); i != scopeTyVars.end(); ++i ) {
	1262	// std::cerr << i->first << " ";
	1263	// }
	1264	// std::cerr << "\n";
[01aeade]	1265	bool oldUseRetval = useRetval;
	1266	useRetval = false;
	1267	appExpr->get_function()->acceptMutator( *this );
	1268	mutateAll( appExpr->get_args(), *this );
	1269	useRetval = oldUseRetval;
[ae63a18]	1270
[01aeade]	1271	assert( ! appExpr->get_function()->get_results().empty() );
	1272	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
	1273	assert( pointer );
	1274	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
	1275	assert( function );
[ae63a18]	1276
[01aeade]	1277	if ( Expression *newExpr = handleIntrinsics( appExpr ) ) {
	1278	return newExpr;
	1279	} // if
[ae63a18]	1280
[01aeade]	1281	Expression *ret = appExpr;
[ae63a18]	1282
[01aeade]	1283	std::list< Expression *>::iterator arg = appExpr->get_args().begin();
	1284	std::list< Expression *>::iterator paramBegin = appExpr->get_args().begin();
[ae63a18]	1285
[bfae637]	1286	TyVarMap exprTyVars( (TypeDecl::Kind)-1 );
[5c52b06]	1287	makeTyVarMap( function, exprTyVars );
[dc12481]	1288	ReferenceToType *polyRetType = isPolyRet( function );
[5c52b06]	1289
[dc12481]	1290	if ( polyRetType ) {
[5c52b06]	1291	ret = addPolyRetParam( appExpr, function, polyRetType, arg );
[01aeade]	1292	} else if ( needsAdapter( function, scopeTyVars ) ) {
[e56cfdb0]	1293	// std::cerr << "needs adapter: ";
	1294	// for ( TyVarMap::iterator i = scopeTyVars.begin(); i != scopeTyVars.end(); ++i ) {
	1295	// std::cerr << i->first << " ";
	1296	// }
	1297	// std::cerr << "\n";
[01aeade]	1298	// change the application so it calls the adapter rather than the passed function
	1299	ret = applyAdapter( appExpr, function, arg, scopeTyVars );
	1300	} // if
	1301	arg = appExpr->get_args().begin();
[ae63a18]	1302
[5c52b06]	1303	passTypeVars( appExpr, polyRetType, arg, exprTyVars );
[01aeade]	1304	addInferredParams( appExpr, function, arg, exprTyVars );
[51b73452]	1305
[01aeade]	1306	arg = paramBegin;
[ae63a18]	1307
[01aeade]	1308	boxParams( appExpr, function, arg, exprTyVars );
	1309	passAdapters( appExpr, function, exprTyVars );
[6c3744e]	1310
[01aeade]	1311	return ret;
	1312	}
[6c3744e]	1313
[01aeade]	1314	Expression Pass1::mutate( UntypedExpr expr ) {
[ffad73a]	1315	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
[01aeade]	1316	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
	1317	if ( name->get_name() == "*?" ) {
	1318	Expression *ret = expr->get_args().front();
	1319	expr->get_args().clear();
	1320	delete expr;
	1321	return ret->acceptMutator( *this );
	1322	} // if
	1323	} // if
	1324	} // if
	1325	return PolyMutator::mutate( expr );
	1326	}
[6c3744e]	1327
[01aeade]	1328	Expression Pass1::mutate( AddressExpr addrExpr ) {
	1329	assert( ! addrExpr->get_arg()->get_results().empty() );
[cf16f94]	1330
	1331	bool needs = false;
	1332	if ( UntypedExpr expr = dynamic_cast< UntypedExpr >( addrExpr->get_arg() ) ) {
[5f6c42c]	1333	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
[cf16f94]	1334	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
	1335	if ( name->get_name() == "*?" ) {
	1336	if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr->get_args().front() ) ) {
	1337	assert( ! appExpr->get_function()->get_results().empty() );
	1338	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
	1339	assert( pointer );
	1340	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
	1341	assert( function );
	1342	needs = needsAdapter( function, scopeTyVars );
	1343	} // if
	1344	} // if
	1345	} // if
	1346	} // if
	1347	} // if
[01aeade]	1348	addrExpr->set_arg( mutateExpression( addrExpr->get_arg() ) );
[5f6c42c]	1349	if ( isPolyType( addrExpr->get_arg()->get_results().front(), scopeTyVars, env ) \|\| needs ) {
[01aeade]	1350	Expression *ret = addrExpr->get_arg();
	1351	delete ret->get_results().front();
	1352	ret->get_results().front() = addrExpr->get_results().front()->clone();
	1353	addrExpr->set_arg( 0 );
	1354	delete addrExpr;
	1355	return ret;
	1356	} else {
	1357	return addrExpr;
	1358	} // if
	1359	}
[6c3744e]	1360
[b10c9959]	1361	/// Wraps a function declaration in a new pointer-to-function variable expression
	1362	VariableExpr wrapFunctionDecl( DeclarationWithType functionDecl ) {
	1363	// line below cloned from FixFunction.cc
	1364	ObjectDecl *functionObj = new ObjectDecl( functionDecl->get_name(), functionDecl->get_storageClass(), functionDecl->get_linkage(), 0,
	1365	new PointerType( Type::Qualifiers(), functionDecl->get_type()->clone() ), 0 );
	1366	functionObj->set_mangleName( functionDecl->get_mangleName() );
	1367	return new VariableExpr( functionObj );
	1368	}
[70a06f6]	1369
[cf16f94]	1370	Statement * Pass1::mutate( ReturnStmt *returnStmt ) {
	1371	if ( retval && returnStmt->get_expr() ) {
	1372	assert( ! returnStmt->get_expr()->get_results().empty() );
	1373	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
	1374	// if ( returnStmt->get_expr()->get_results().front()->get_isLvalue() ) {
[ae63a18]	1375	// by this point, a cast expr on a polymorphic return value is redundant
[cf16f94]	1376	while ( CastExpr castExpr = dynamic_cast< CastExpr >( returnStmt->get_expr() ) ) {
	1377	returnStmt->set_expr( castExpr->get_arg() );
	1378	returnStmt->get_expr()->set_env( castExpr->get_env() );
	1379	castExpr->set_env( 0 );
	1380	castExpr->set_arg( 0 );
	1381	delete castExpr;
[5f6c42c]	1382	} //while
[1194734]	1383
	1384	// find assignment operator for (polymorphic) return type
[b10c9959]	1385	ApplicationExpr *assignExpr = 0;
[1194734]	1386	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( retval->get_type() ) ) {
[b10c9959]	1387	// find assignment operator for type variable
[63c0dbf]	1388	ScopedMap< std::string, DeclarationWithType *>::const_iterator assignIter = assignOps.find( typeInst->get_name() );
[1194734]	1389	if ( assignIter == assignOps.end() ) {
	1390	throw SemanticError( "Attempt to return dtype or ftype object in ", returnStmt->get_expr() );
	1391	} // if
[b10c9959]	1392	assignExpr = new ApplicationExpr( new VariableExpr( assignIter->second ) );
[1194734]	1393	} else if ( ReferenceToType refType = dynamic_cast< ReferenceToType >( retval->get_type() ) ) {
[b10c9959]	1394	// find assignment operator for generic type
[dc12481]	1395	DeclarationWithType *functionDecl = scopedAssignOps.find( refType );
	1396	if ( ! functionDecl ) {
[1194734]	1397	throw SemanticError( "Attempt to return dtype or ftype generic object in ", returnStmt->get_expr() );
	1398	}
[b10c9959]	1399
	1400	// wrap it up in an application expression
	1401	assignExpr = new ApplicationExpr( wrapFunctionDecl( functionDecl ) );
	1402	assignExpr->set_env( env->clone() );
	1403
	1404	// find each of its needed secondary assignment operators
	1405	std::list< Expression* > &tyParams = refType->get_parameters();
	1406	std::list< TypeDecl* > &forallParams = functionDecl->get_type()->get_forall();
	1407	std::list< Expression* >::const_iterator tyIt = tyParams.begin();
	1408	std::list< TypeDecl* >::const_iterator forallIt = forallParams.begin();
	1409	for ( ; tyIt != tyParams.end() && forallIt != forallParams.end(); ++tyIt, ++forallIt ) {
[ae7014e]	1410	// Add appropriate mapping to assignment expression environment
[b10c9959]	1411	TypeExpr formalTypeExpr = dynamic_cast< TypeExpr >( *tyIt );
	1412	assert( formalTypeExpr && "type parameters must be type expressions" );
	1413	Type *formalType = formalTypeExpr->get_type();
[ae7014e]	1414	assignExpr->get_env()->add( (*forallIt)->get_name(), formalType );
	1415
	1416	// skip types with no assign op (ftype/dtype)
	1417	if ( (*forallIt)->get_kind() != TypeDecl::Any ) continue;
	1418
	1419	// find assignment operator for formal type
[b10c9959]	1420	DeclarationWithType *assertAssign = 0;
	1421	if ( TypeInstType formalTypeInstType = dynamic_cast< TypeInstType >( formalType ) ) {
[63c0dbf]	1422	ScopedMap< std::string, DeclarationWithType *>::const_iterator assertAssignIt = assignOps.find( formalTypeInstType->get_name() );
[b10c9959]	1423	if ( assertAssignIt == assignOps.end() ) {
	1424	throw SemanticError( "No assignment operation found for ", formalTypeInstType );
	1425	}
	1426	assertAssign = assertAssignIt->second;
[dc12481]	1427	} else {
	1428	assertAssign = scopedAssignOps.find( formalType );
	1429	if ( ! assertAssign ) {
	1430	throw SemanticError( "No assignment operation found for ", formalType );
[b10c9959]	1431	}
[dc12481]	1432	}
[b10c9959]	1433
[ae7014e]	1434	// add inferred parameter for field assignment operator to assignment expression
	1435	std::list< DeclarationWithType* > &asserts = (*forallIt)->get_assertions();
	1436	assert( ! asserts.empty() && "Type param needs assignment operator assertion" );
	1437	DeclarationWithType *actualDecl = asserts.front();
[b10c9959]	1438	assignExpr->get_inferParams()[ actualDecl->get_uniqueId() ]
	1439	= ParamEntry( assertAssign->get_uniqueId(), assertAssign->get_type()->clone(), actualDecl->get_type()->clone(), wrapFunctionDecl( assertAssign ) );
	1440	}
[1194734]	1441	}
[b10c9959]	1442	assert( assignExpr );
[1194734]	1443
	1444	// replace return statement with appropriate assignment to out parameter
[cf16f94]	1445	Expression *retParm = new NameExpr( retval->get_name() );
	1446	retParm->get_results().push_back( new PointerType( Type::Qualifiers(), retval->get_type()->clone() ) );
	1447	assignExpr->get_args().push_back( retParm );
	1448	assignExpr->get_args().push_back( returnStmt->get_expr() );
	1449	stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( assignExpr ) ) );
	1450	// } else {
	1451	// useRetval = true;
	1452	// stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( returnStmt->get_expr() ) ) );
	1453	// useRetval = false;
	1454	// } // if
	1455	returnStmt->set_expr( 0 );
[01aeade]	1456	} else {
[cf16f94]	1457	returnStmt->set_expr( mutateExpression( returnStmt->get_expr() ) );
[01aeade]	1458	} // if
[cf16f94]	1459	return returnStmt;
[01aeade]	1460	}
[6c3744e]	1461
[01aeade]	1462	Type * Pass1::mutate( PointerType *pointerType ) {
[6f49cdf]	1463	scopeTyVars.beginScope();
[01aeade]	1464	makeTyVarMap( pointerType, scopeTyVars );
[ae63a18]	1465
[01aeade]	1466	Type *ret = Mutator::mutate( pointerType );
[ae63a18]	1467
[6f49cdf]	1468	scopeTyVars.endScope();
[01aeade]	1469	return ret;
	1470	}
[6c3744e]	1471
[01aeade]	1472	Type * Pass1::mutate( FunctionType *functionType ) {
[6f49cdf]	1473	scopeTyVars.beginScope();
[01aeade]	1474	makeTyVarMap( functionType, scopeTyVars );
[ae63a18]	1475
[01aeade]	1476	Type *ret = Mutator::mutate( functionType );
[ae63a18]	1477
[6f49cdf]	1478	scopeTyVars.endScope();
[01aeade]	1479	return ret;
	1480	}
[51b73452]	1481
[01aeade]	1482	void Pass1::doBeginScope() {
[6635c74]	1483	adapters.beginScope();
[1194734]	1484	scopedAssignOps.beginScope();
[01aeade]	1485	}
[b1a6d6b]	1486
[01aeade]	1487	void Pass1::doEndScope() {
[6635c74]	1488	adapters.endScope();
[1194734]	1489	scopedAssignOps.endScope();
[01aeade]	1490	}
[51b73452]	1491
	1492	////////////////////////////////////////// Pass2 ////////////////////////////////////////////////////
	1493
[01aeade]	1494	void Pass2::addAdapters( FunctionType *functionType ) {
	1495	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
	1496	std::list< FunctionType *> functions;
	1497	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
	1498	Type orig = (arg)->get_type();
	1499	findAndReplaceFunction( orig, functions, scopeTyVars, needsAdapter );
	1500	(*arg)->set_type( orig );
	1501	}
	1502	std::set< std::string > adaptersDone;
	1503	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
[bdf1954]	1504	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
[01aeade]	1505	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
	1506	std::string adapterName = makeAdapterName( mangleName );
[68cd1ce]	1507	paramList.push_front( new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( *funType, scopeTyVars ) ), 0 ) );
[01aeade]	1508	adaptersDone.insert( adaptersDone.begin(), mangleName );
	1509	}
	1510	}
[5f6c42c]	1511	// deleteAll( functions );
[01aeade]	1512	}
[6c3744e]	1513
[01aeade]	1514	template< typename DeclClass >
	1515	DeclClass * Pass2::handleDecl( DeclClass decl, Type type ) {
	1516	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
[6c3744e]	1517
[01aeade]	1518	return ret;
	1519	}
[6c3744e]	1520
[01aeade]	1521	DeclarationWithType * Pass2::mutate( FunctionDecl *functionDecl ) {
	1522	return handleDecl( functionDecl, functionDecl->get_functionType() );
	1523	}
[6c3744e]	1524
[01aeade]	1525	ObjectDecl * Pass2::mutate( ObjectDecl *objectDecl ) {
	1526	return handleDecl( objectDecl, objectDecl->get_type() );
	1527	}
[6c3744e]	1528
[01aeade]	1529	TypeDecl * Pass2::mutate( TypeDecl *typeDecl ) {
	1530	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
	1531	if ( typeDecl->get_base() ) {
	1532	return handleDecl( typeDecl, typeDecl->get_base() );
	1533	} else {
	1534	return Mutator::mutate( typeDecl );
	1535	}
	1536	}
[6c3744e]	1537
[01aeade]	1538	TypedefDecl * Pass2::mutate( TypedefDecl *typedefDecl ) {
	1539	return handleDecl( typedefDecl, typedefDecl->get_base() );
	1540	}
[6c3744e]	1541
[01aeade]	1542	Type * Pass2::mutate( PointerType *pointerType ) {
[6f49cdf]	1543	scopeTyVars.beginScope();
[01aeade]	1544	makeTyVarMap( pointerType, scopeTyVars );
[ae63a18]	1545
[01aeade]	1546	Type *ret = Mutator::mutate( pointerType );
[ae63a18]	1547
[6f49cdf]	1548	scopeTyVars.endScope();
[01aeade]	1549	return ret;
	1550	}
[6c3744e]	1551
[01aeade]	1552	Type Pass2::mutate( FunctionType funcType ) {
[6f49cdf]	1553	scopeTyVars.beginScope();
[01aeade]	1554	makeTyVarMap( funcType, scopeTyVars );
[7754cde]	1555
	1556	// move polymorphic return type to parameter list
[aadc9a4]	1557	if ( isPolyRet( funcType ) ) {
[01aeade]	1558	DeclarationWithType *ret = funcType->get_returnVals().front();
	1559	ret->set_type( new PointerType( Type::Qualifiers(), ret->get_type() ) );
	1560	funcType->get_parameters().push_front( ret );
	1561	funcType->get_returnVals().pop_front();
	1562	}
[7754cde]	1563
	1564	// add size/align and assertions for type parameters to parameter list
[01aeade]	1565	std::list< DeclarationWithType *>::iterator last = funcType->get_parameters().begin();
	1566	std::list< DeclarationWithType *> inferredParams;
[78dd0da]	1567	ObjectDecl newObj( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), 0 );
[05d47278]	1568	ObjectDecl newPtr( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0,
	1569	new PointerType( Type::Qualifiers(), new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) ), 0 );
[01aeade]	1570	for ( std::list< TypeDecl *>::const_iterator tyParm = funcType->get_forall().begin(); tyParm != funcType->get_forall().end(); ++tyParm ) {
[db0b3ce]	1571	ObjectDecl sizeParm, alignParm;
	1572	// add all size and alignment parameters to parameter list
[01aeade]	1573	if ( (*tyParm)->get_kind() == TypeDecl::Any ) {
[78dd0da]	1574	TypeInstType parmType( Type::Qualifiers(), (tyParm)->get_name(), tyParm );
[adc6781]	1575	std::string parmName = mangleType( &parmType );
[ae63a18]	1576
[78dd0da]	1577	sizeParm = newObj.clone();
[adc6781]	1578	sizeParm->set_name( sizeofName( parmName ) );
[db0b3ce]	1579	last = funcType->get_parameters().insert( last, sizeParm );
	1580	++last;
[78dd0da]	1581
	1582	alignParm = newObj.clone();
[adc6781]	1583	alignParm->set_name( alignofName( parmName ) );
[db0b3ce]	1584	last = funcType->get_parameters().insert( last, alignParm );
[01aeade]	1585	++last;
	1586	}
[e56cfdb0]	1587	// move all assertions into parameter list
[01aeade]	1588	for ( std::list< DeclarationWithType >::iterator assert = (tyParm)->get_assertions().begin(); assert != (*tyParm)->get_assertions().end(); ++assert ) {
[f8b961b]	1589	// assert = (assert)->acceptMutator( *this );
[01aeade]	1590	inferredParams.push_back( *assert );
	1591	}
	1592	(*tyParm)->get_assertions().clear();
	1593	}
[7754cde]	1594
[5c52b06]	1595	// add size/align for generic parameter types to parameter list
[b18b0b5]	1596	std::set< std::string > seenTypes; // sizeofName for generic types we've seen
[7754cde]	1597	for ( std::list< DeclarationWithType* >::const_iterator fnParm = last; fnParm != funcType->get_parameters().end(); ++fnParm ) {
[4b8f918]	1598	Type polyType = isPolyType( (fnParm)->get_type(), scopeTyVars );
	1599	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
	1600	std::string typeName = mangleType( polyType );
[adc6781]	1601	if ( seenTypes.count( typeName ) ) continue;
[ae63a18]	1602
[05d47278]	1603	ObjectDecl sizeParm, alignParm, *offsetParm;
[7754cde]	1604	sizeParm = newObj.clone();
[adc6781]	1605	sizeParm->set_name( sizeofName( typeName ) );
[7754cde]	1606	last = funcType->get_parameters().insert( last, sizeParm );
	1607	++last;
	1608
	1609	alignParm = newObj.clone();
[adc6781]	1610	alignParm->set_name( alignofName( typeName ) );
[7754cde]	1611	last = funcType->get_parameters().insert( last, alignParm );
	1612	++last;
	1613
[4b8f918]	1614	if ( StructInstType polyBaseStruct = dynamic_cast< StructInstType >( polyType ) ) {
[89173242]	1615	// NOTE zero-length arrays are illegal in C, so empty structs have no offset array
	1616	if ( ! polyBaseStruct->get_baseStruct()->get_members().empty() ) {
	1617	offsetParm = newPtr.clone();
[adc6781]	1618	offsetParm->set_name( offsetofName( typeName ) );
[89173242]	1619	last = funcType->get_parameters().insert( last, offsetParm );
	1620	++last;
	1621	}
[05d47278]	1622	}
	1623
[adc6781]	1624	seenTypes.insert( typeName );
[7754cde]	1625	}
	1626	}
	1627
	1628	// splice assertion parameters into parameter list
[01aeade]	1629	funcType->get_parameters().splice( last, inferredParams );
	1630	addAdapters( funcType );
	1631	mutateAll( funcType->get_returnVals(), *this );
	1632	mutateAll( funcType->get_parameters(), *this );
[ae63a18]	1633
[6f49cdf]	1634	scopeTyVars.endScope();
[01aeade]	1635	return funcType;
	1636	}
[51b73452]	1637
[4e284ea6]	1638	//////////////////////////////////////// GenericInstantiator //////////////////////////////////////////////////
	1639
	1640	/// Makes substitutions of params into baseParams; returns true if all parameters substituted for a concrete type
	1641	bool makeSubstitutions( const std::list< TypeDecl* >& baseParams, const std::list< Expression* >& params, std::list< TypeExpr* >& out ) {
	1642	bool allConcrete = true; // will finish the substitution list even if they're not all concrete
	1643
	1644	// substitute concrete types for given parameters, and incomplete types for placeholders
	1645	std::list< TypeDecl* >::const_iterator baseParam = baseParams.begin();
	1646	std::list< Expression* >::const_iterator param = params.begin();
	1647	for ( ; baseParam != baseParams.end() && param != params.end(); ++baseParam, ++param ) {
	1648	// switch ( (*baseParam)->get_kind() ) {
	1649	// case TypeDecl::Any: { // any type is a valid substitution here; complete types can be used to instantiate generics
	1650	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
	1651	assert(paramType && "Aggregate parameters should be type expressions");
	1652	out.push_back( paramType->clone() );
	1653	// check that the substituted type isn't a type variable itself
	1654	if ( dynamic_cast< TypeInstType* >( paramType->get_type() ) ) {
	1655	allConcrete = false;
	1656	}
	1657	// break;
	1658	// }
	1659	// case TypeDecl::Dtype: // dtype can be consistently replaced with void [only pointers, which become void*]
	1660	// out.push_back( new TypeExpr( new VoidType( Type::Qualifiers() ) ) );
	1661	// break;
	1662	// case TypeDecl::Ftype: // pointer-to-ftype can be consistently replaced with void (*)(void) [similar to dtype]
	1663	// out.push_back( new TypeExpr( new FunctionType( Type::Qualifiers(), false ) ) );
	1664	// break;
	1665	// }
	1666	}
	1667
	1668	// if any parameters left over, not done
	1669	if ( baseParam != baseParams.end() ) return false;
	1670	// // if not enough parameters given, substitute remaining incomplete types for placeholders
	1671	// for ( ; baseParam != baseParams.end(); ++baseParam ) {
	1672	// switch ( (*baseParam)->get_kind() ) {
	1673	// case TypeDecl::Any: // no more substitutions here, fail early
	1674	// return false;
	1675	// case TypeDecl::Dtype: // dtype can be consistently replaced with void [only pointers, which become void*]
	1676	// out.push_back( new TypeExpr( new VoidType( Type::Qualifiers() ) ) );
	1677	// break;
	1678	// case TypeDecl::Ftype: // pointer-to-ftype can be consistently replaced with void (*)(void) [similar to dtype]
	1679	// out.push_back( new TypeExpr( new FunctionType( Type::Qualifiers(), false ) ) );
	1680	// break;
	1681	// }
	1682	// }
	1683
	1684	return allConcrete;
	1685	}
	1686
	1687	/// Substitutes types of members of in according to baseParams => typeSubs, appending the result to out
	1688	void substituteMembers( const std::list< Declaration* >& in, const std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs,
	1689	std::list< Declaration* >& out ) {
	1690	// substitute types into new members
	1691	TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
	1692	for ( std::list< Declaration* >::const_iterator member = in.begin(); member != in.end(); ++member ) {
	1693	Declaration newMember = (member)->clone();
	1694	subs.apply(newMember);
	1695	out.push_back( newMember );
	1696	}
	1697	}
	1698
	1699	Type* GenericInstantiator::mutate( StructInstType *inst ) {
	1700	// mutate subtypes
	1701	Type *mutated = Mutator::mutate( inst );
	1702	inst = dynamic_cast< StructInstType* >( mutated );
	1703	if ( ! inst ) return mutated;
	1704
	1705	// exit early if no need for further mutation
	1706	if ( inst->get_parameters().empty() ) return inst;
	1707	assert( inst->get_baseParameters() && "Base struct has parameters" );
	1708
	1709	// check if type can be concretely instantiated; put substitutions into typeSubs
	1710	std::list< TypeExpr* > typeSubs;
	1711	if ( ! makeSubstitutions( *inst->get_baseParameters(), inst->get_parameters(), typeSubs ) ) {
	1712	deleteAll( typeSubs );
	1713	return inst;
	1714	}
	1715
	1716	// make concrete instantiation of generic type
	1717	StructDecl *concDecl = lookup( inst, typeSubs );
	1718	if ( ! concDecl ) {
	1719	// set concDecl to new type, insert type declaration into statements to add
	1720	concDecl = new StructDecl( typeNamer.newName( inst->get_name() ) );
	1721	substituteMembers( inst->get_baseStruct()->get_members(), *inst->get_baseParameters(), typeSubs, concDecl->get_members() );
	1722	DeclMutator::addDeclaration( concDecl );
	1723	insert( inst, typeSubs, concDecl );
	1724	}
	1725	StructInstType *newInst = new StructInstType( inst->get_qualifiers(), concDecl->get_name() );
	1726	newInst->set_baseStruct( concDecl );
	1727
	1728	deleteAll( typeSubs );
	1729	delete inst;
	1730	return newInst;
	1731	}
	1732
	1733	Type* GenericInstantiator::mutate( UnionInstType *inst ) {
	1734	// mutate subtypes
	1735	Type *mutated = Mutator::mutate( inst );
	1736	inst = dynamic_cast< UnionInstType* >( mutated );
	1737	if ( ! inst ) return mutated;
	1738
	1739	// exit early if no need for further mutation
	1740	if ( inst->get_parameters().empty() ) return inst;
	1741	assert( inst->get_baseParameters() && "Base union has parameters" );
	1742
	1743	// check if type can be concretely instantiated; put substitutions into typeSubs
	1744	std::list< TypeExpr* > typeSubs;
	1745	if ( ! makeSubstitutions( *inst->get_baseParameters(), inst->get_parameters(), typeSubs ) ) {
	1746	deleteAll( typeSubs );
	1747	return inst;
	1748	}
	1749
	1750	// make concrete instantiation of generic type
	1751	UnionDecl *concDecl = lookup( inst, typeSubs );
	1752	if ( ! concDecl ) {
	1753	// set concDecl to new type, insert type declaration into statements to add
	1754	concDecl = new UnionDecl( typeNamer.newName( inst->get_name() ) );
	1755	substituteMembers( inst->get_baseUnion()->get_members(), *inst->get_baseParameters(), typeSubs, concDecl->get_members() );
	1756	DeclMutator::addDeclaration( concDecl );
	1757	insert( inst, typeSubs, concDecl );
	1758	}
	1759	UnionInstType *newInst = new UnionInstType( inst->get_qualifiers(), concDecl->get_name() );
	1760	newInst->set_baseUnion( concDecl );
	1761
	1762	deleteAll( typeSubs );
	1763	delete inst;
	1764	return newInst;
	1765	}
	1766
	1767	// /// Gets the base struct or union declaration for a member expression; NULL if not applicable
	1768	// AggregateDecl* getMemberBaseDecl( MemberExpr *memberExpr ) {
	1769	// // get variable for member aggregate
	1770	// VariableExpr varExpr = dynamic_cast< VariableExpr >( memberExpr->get_aggregate() );
	1771	// if ( ! varExpr ) return NULL;
	1772	//
	1773	// // get object for variable
	1774	// ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( varExpr->get_var() );
	1775	// if ( ! objectDecl ) return NULL;
	1776	//
	1777	// // get base declaration from object type
	1778	// Type *objectType = objectDecl->get_type();
	1779	// StructInstType structType = dynamic_cast< StructInstType >( objectType );
	1780	// if ( structType ) return structType->get_baseStruct();
	1781	// UnionInstType unionType = dynamic_cast< UnionInstType >( objectType );
	1782	// if ( unionType ) return unionType->get_baseUnion();
	1783	//
	1784	// return NULL;
	1785	// }
	1786	//
	1787	// /// Finds the declaration with the given name, returning decls.end() if none such
	1788	// std::list< Declaration* >::const_iterator findDeclNamed( const std::list< Declaration* > &decls, const std::string &name ) {
	1789	// for( std::list< Declaration* >::const_iterator decl = decls.begin(); decl != decls.end(); ++decl ) {
	1790	// if ( (*decl)->get_name() == name ) return decl;
	1791	// }
	1792	// return decls.end();
	1793	// }
	1794	//
	1795	// Expression* Instantiate::mutate( MemberExpr *memberExpr ) {
	1796	// // mutate, exiting early if no longer MemberExpr
	1797	// Expression *expr = Mutator::mutate( memberExpr );
	1798	// memberExpr = dynamic_cast< MemberExpr* >( expr );
	1799	// if ( ! memberExpr ) return expr;
	1800	//
	1801	// // get declaration of member and base declaration of member, exiting early if not found
	1802	// AggregateDecl *memberBase = getMemberBaseDecl( memberExpr );
	1803	// if ( ! memberBase ) return memberExpr;
	1804	// DeclarationWithType *memberDecl = memberExpr->get_member();
	1805	// std::list< Declaration* >::const_iterator baseIt = findDeclNamed( memberBase->get_members(), memberDecl->get_name() );
	1806	// if ( baseIt == memberBase->get_members().end() ) return memberExpr;
	1807	// DeclarationWithType baseDecl = dynamic_cast< DeclarationWithType >( *baseIt );
	1808	// if ( ! baseDecl ) return memberExpr;
	1809	//
	1810	// // check if stated type of the member is not the type of the member's declaration; if so, need a cast
	1811	// // this SHOULD be safe, I don't think anything but the void-replacements I put in for dtypes would make it past the typechecker
	1812	// SymTab::Indexer dummy;
	1813	// if ( ResolvExpr::typesCompatible( memberDecl->get_type(), baseDecl->get_type(), dummy ) ) return memberExpr;
	1814	// else return new CastExpr( memberExpr, memberDecl->get_type() );
	1815	// }
	1816
	1817	void GenericInstantiator::doBeginScope() {
	1818	DeclMutator::doBeginScope();
	1819	instantiations.beginScope();
	1820	}
	1821
	1822	void GenericInstantiator::doEndScope() {
	1823	DeclMutator::doEndScope();
	1824	instantiations.endScope();
	1825	}
	1826
[4b8f918]	1827	////////////////////////////////////////// PolyGenericCalculator ////////////////////////////////////////////////////
[51b73452]	1828
[aa19ccf]	1829	void PolyGenericCalculator::beginTypeScope( Type *ty ) {
	1830	scopeTyVars.beginScope();
	1831	makeTyVarMap( ty, scopeTyVars );
	1832	}
	1833
	1834	void PolyGenericCalculator::endTypeScope() {
	1835	scopeTyVars.endScope();
	1836	}
[51b73452]	1837
[01aeade]	1838	template< typename DeclClass >
[8a34677]	1839	DeclClass * PolyGenericCalculator::handleDecl( DeclClass decl, Type type ) {
[aa19ccf]	1840	beginTypeScope( type );
	1841	knownLayouts.beginScope();
	1842	knownOffsets.beginScope();
[ae63a18]	1843
[01aeade]	1844	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
[6c3744e]	1845
[aa19ccf]	1846	knownOffsets.endScope();
	1847	knownLayouts.endScope();
	1848	endTypeScope();
[01aeade]	1849	return ret;
	1850	}
[6c3744e]	1851
[8a34677]	1852	ObjectDecl * PolyGenericCalculator::mutate( ObjectDecl *objectDecl ) {
[01aeade]	1853	return handleDecl( objectDecl, objectDecl->get_type() );
	1854	}
[6c3744e]	1855
[8a34677]	1856	DeclarationWithType * PolyGenericCalculator::mutate( FunctionDecl *functionDecl ) {
[01aeade]	1857	return handleDecl( functionDecl, functionDecl->get_functionType() );
	1858	}
[6c3744e]	1859
[8a34677]	1860	TypedefDecl * PolyGenericCalculator::mutate( TypedefDecl *typedefDecl ) {
[01aeade]	1861	return handleDecl( typedefDecl, typedefDecl->get_base() );
	1862	}
[6c3744e]	1863
[8a34677]	1864	TypeDecl * PolyGenericCalculator::mutate( TypeDecl *typeDecl ) {
[01aeade]	1865	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
	1866	return Mutator::mutate( typeDecl );
	1867	}
[51b73452]	1868
[8a34677]	1869	Type * PolyGenericCalculator::mutate( PointerType *pointerType ) {
[aa19ccf]	1870	beginTypeScope( pointerType );
[ae63a18]	1871
[01aeade]	1872	Type *ret = Mutator::mutate( pointerType );
[ae63a18]	1873
[aa19ccf]	1874	endTypeScope();
[01aeade]	1875	return ret;
	1876	}
[6c3744e]	1877
[8a34677]	1878	Type * PolyGenericCalculator::mutate( FunctionType *funcType ) {
[aa19ccf]	1879	beginTypeScope( funcType );
[ae63a18]	1880
[8a34677]	1881	// make sure that any type information passed into the function is accounted for
	1882	for ( std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin(); fnParm != funcType->get_parameters().end(); ++fnParm ) {
	1883	// condition here duplicates that in Pass2::mutate( FunctionType* )
[4b8f918]	1884	Type polyType = isPolyType( (fnParm)->get_type(), scopeTyVars );
	1885	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
	1886	knownLayouts.insert( mangleType( polyType ) );
[8a34677]	1887	}
	1888	}
[70a06f6]	1889
[8a34677]	1890	Type *ret = Mutator::mutate( funcType );
[ae63a18]	1891
[aa19ccf]	1892	endTypeScope();
[01aeade]	1893	return ret;
[6c3744e]	1894	}
[51b73452]	1895
[8a34677]	1896	Statement PolyGenericCalculator::mutate( DeclStmt declStmt ) {
[01aeade]	1897	if ( ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( declStmt->get_decl() ) ) {
[8a34677]	1898	if ( findGeneric( objectDecl->get_type() ) ) {
[e01559c]	1899	// change initialization of a polymorphic value object
	1900	// to allocate storage with alloca
[ffad73a]	1901	Type *declType = objectDecl->get_type();
[01aeade]	1902	UntypedExpr *alloc = new UntypedExpr( new NameExpr( "__builtin_alloca" ) );
[adc6781]	1903	alloc->get_args().push_back( new NameExpr( sizeofName( mangleType( declType ) ) ) );
[e01559c]	1904
	1905	delete objectDecl->get_init();
	1906
	1907	std::list<Expression*> designators;
[974906e2]	1908	objectDecl->set_init( new SingleInit( alloc, designators, false ) ); // not constructed
[01aeade]	1909	}
	1910	}
	1911	return Mutator::mutate( declStmt );
	1912	}
[05d47278]	1913
[2a4b088]	1914	/// Finds the member in the base list that matches the given declaration; returns its index, or -1 if not present
	1915	long findMember( DeclarationWithType memberDecl, std::list< Declaration > &baseDecls ) {
	1916	long i = 0;
	1917	for(std::list< Declaration* >::const_iterator decl = baseDecls.begin(); decl != baseDecls.end(); ++decl, ++i ) {
	1918	if ( memberDecl->get_name() != (*decl)->get_name() ) continue;
	1919
	1920	if ( DeclarationWithType declWithType = dynamic_cast< DeclarationWithType >( *decl ) ) {
[bed4d37c]	1921	if ( memberDecl->get_mangleName().empty() \|\| declWithType->get_mangleName().empty()
	1922	\|\| memberDecl->get_mangleName() == declWithType->get_mangleName() ) return i;
[2a4b088]	1923	else continue;
	1924	} else return i;
	1925	}
	1926	return -1;
	1927	}
	1928
	1929	/// Returns an index expression into the offset array for a type
	1930	Expression makeOffsetIndex( Type objectType, long i ) {
	1931	std::stringstream offset_namer;
	1932	offset_namer << i;
	1933	ConstantExpr *fieldIndex = new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), offset_namer.str() ) );
	1934	UntypedExpr *fieldOffset = new UntypedExpr( new NameExpr( "?[?]" ) );
[adc6781]	1935	fieldOffset->get_args().push_back( new NameExpr( offsetofName( mangleType( objectType ) ) ) );
[2a4b088]	1936	fieldOffset->get_args().push_back( fieldIndex );
	1937	return fieldOffset;
	1938	}
	1939
	1940	/// Returns an expression dereferenced n times
	1941	Expression makeDerefdVar( Expression derefdVar, long n ) {
	1942	for ( int i = 1; i < n; ++i ) {
	1943	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
	1944	derefExpr->get_args().push_back( derefdVar );
	1945	derefdVar = derefExpr;
	1946	}
	1947	return derefdVar;
	1948	}
[d63eeb0]	1949
[8a34677]	1950	Expression PolyGenericCalculator::mutate( MemberExpr memberExpr ) {
[05d47278]	1951	// mutate, exiting early if no longer MemberExpr
	1952	Expression *expr = Mutator::mutate( memberExpr );
	1953	memberExpr = dynamic_cast< MemberExpr* >( expr );
	1954	if ( ! memberExpr ) return expr;
	1955
	1956	// get declaration for base struct, exiting early if not found
[8488c715]	1957	int varDepth;
	1958	VariableExpr *varExpr = getBaseVar( memberExpr->get_aggregate(), &varDepth );
[05d47278]	1959	if ( ! varExpr ) return memberExpr;
	1960	ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( varExpr->get_var() );
	1961	if ( ! objectDecl ) return memberExpr;
	1962
	1963	// only mutate member expressions for polymorphic types
[8488c715]	1964	int tyDepth;
	1965	Type *objectType = hasPolyBase( objectDecl->get_type(), scopeTyVars, &tyDepth );
[05d47278]	1966	if ( ! objectType ) return memberExpr;
[8a34677]	1967	findGeneric( objectType ); // ensure layout for this type is available
[05d47278]	1968
[4318107]	1969	Expression *newMemberExpr = 0;
[05d47278]	1970	if ( StructInstType structType = dynamic_cast< StructInstType >( objectType ) ) {
[2a4b088]	1971	// look up offset index
	1972	long i = findMember( memberExpr->get_member(), structType->get_baseStruct()->get_members() );
	1973	if ( i == -1 ) return memberExpr;
[05d47278]	1974
[2a4b088]	1975	// replace member expression with pointer to base plus offset
	1976	UntypedExpr *fieldLoc = new UntypedExpr( new NameExpr( "?+?" ) );
	1977	fieldLoc->get_args().push_back( makeDerefdVar( varExpr->clone(), varDepth ) );
	1978	fieldLoc->get_args().push_back( makeOffsetIndex( objectType, i ) );
[4318107]	1979	newMemberExpr = fieldLoc;
[98735ef]	1980	} else if ( dynamic_cast< UnionInstType* >( objectType ) ) {
[2a4b088]	1981	// union members are all at offset zero, so build appropriately-dereferenced variable
[4318107]	1982	newMemberExpr = makeDerefdVar( varExpr->clone(), varDepth );
[2a4b088]	1983	} else return memberExpr;
[4318107]	1984	assert( newMemberExpr );
	1985
[4067aa8]	1986	Type *memberType = memberExpr->get_member()->get_type();
	1987	if ( ! isPolyType( memberType, scopeTyVars ) ) {
	1988	// Not all members of a polymorphic type are themselves of polymorphic type; in this case the member expression should be wrapped and dereferenced to form an lvalue
	1989	CastExpr *ptrCastExpr = new CastExpr( newMemberExpr, new PointerType( Type::Qualifiers(), memberType->clone() ) );
[4318107]	1990	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
	1991	derefExpr->get_args().push_back( ptrCastExpr );
	1992	newMemberExpr = derefExpr;
	1993	}
	1994
	1995	delete memberExpr;
	1996	return newMemberExpr;
[2a4b088]	1997	}
[05d47278]	1998
[8a34677]	1999	ObjectDecl PolyGenericCalculator::makeVar( const std::string &name, Type type, Initializer *init ) {
	2000	ObjectDecl *newObj = new ObjectDecl( name, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, init );
	2001	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
	2002	return newObj;
	2003	}
	2004
	2005	void PolyGenericCalculator::addOtypeParamsToLayoutCall( UntypedExpr layoutCall, const std::list< Type > &otypeParams ) {
	2006	for ( std::list< Type* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
	2007	if ( findGeneric( *param ) ) {
	2008	// push size/align vars for a generic parameter back
[adc6781]	2009	std::string paramName = mangleType( *param );
	2010	layoutCall->get_args().push_back( new NameExpr( sizeofName( paramName ) ) );
	2011	layoutCall->get_args().push_back( new NameExpr( alignofName( paramName ) ) );
[8a34677]	2012	} else {
	2013	layoutCall->get_args().push_back( new SizeofExpr( (*param)->clone() ) );
	2014	layoutCall->get_args().push_back( new AlignofExpr( (*param)->clone() ) );
	2015	}
	2016	}
	2017	}
	2018
	2019	/// returns true if any of the otype parameters have a dynamic layout and puts all otype parameters in the output list
	2020	bool findGenericParams( std::list< TypeDecl* > &baseParams, std::list< Expression* > &typeParams, std::list< Type* > &out ) {
	2021	bool hasDynamicLayout = false;
	2022
	2023	std::list< TypeDecl* >::const_iterator baseParam = baseParams.begin();
	2024	std::list< Expression* >::const_iterator typeParam = typeParams.begin();
	2025	for ( ; baseParam != baseParams.end() && typeParam != typeParams.end(); ++baseParam, ++typeParam ) {
	2026	// skip non-otype parameters
	2027	if ( (*baseParam)->get_kind() != TypeDecl::Any ) continue;
	2028	TypeExpr typeExpr = dynamic_cast< TypeExpr >( *typeParam );
	2029	assert( typeExpr && "all otype parameters should be type expressions" );
	2030
	2031	Type *type = typeExpr->get_type();
	2032	out.push_back( type );
	2033	if ( isPolyType( type ) ) hasDynamicLayout = true;
	2034	}
	2035	assert( baseParam == baseParams.end() && typeParam == typeParams.end() );
	2036
	2037	return hasDynamicLayout;
	2038	}
	2039
	2040	bool PolyGenericCalculator::findGeneric( Type *ty ) {
	2041	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( ty ) ) {
	2042	// duplicate logic from isPolyType()
	2043	if ( env ) {
	2044	if ( Type *newType = env->lookup( typeInst->get_name() ) ) {
	2045	return findGeneric( newType );
	2046	} // if
	2047	} // if
	2048	if ( scopeTyVars.find( typeInst->get_name() ) != scopeTyVars.end() ) {
	2049	// NOTE assumes here that getting put in the scopeTyVars included having the layout variables set
	2050	return true;
	2051	}
	2052	return false;
	2053	} else if ( StructInstType structTy = dynamic_cast< StructInstType >( ty ) ) {
	2054	// check if this type already has a layout generated for it
[adc6781]	2055	std::string typeName = mangleType( ty );
	2056	if ( knownLayouts.find( typeName ) != knownLayouts.end() ) return true;
[8a34677]	2057
	2058	// check if any of the type parameters have dynamic layout; if none do, this type is (or will be) monomorphized
	2059	std::list< Type* > otypeParams;
	2060	if ( ! findGenericParams( *structTy->get_baseParameters(), structTy->get_parameters(), otypeParams ) ) return false;
	2061
	2062	// insert local variables for layout and generate call to layout function
[adc6781]	2063	knownLayouts.insert( typeName ); // done early so as not to interfere with the later addition of parameters to the layout call
[8a34677]	2064	Type *layoutType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
	2065
	2066	int n_members = structTy->get_baseStruct()->get_members().size();
	2067	if ( n_members == 0 ) {
	2068	// all empty structs have the same layout - size 1, align 1
[adc6781]	2069	makeVar( sizeofName( typeName ), layoutType, new SingleInit( new ConstantExpr( Constant::from( (unsigned long)1 ) ) ) );
	2070	makeVar( alignofName( typeName ), layoutType->clone(), new SingleInit( new ConstantExpr( Constant::from( (unsigned long)1 ) ) ) );
[8a34677]	2071	// NOTE zero-length arrays are forbidden in C, so empty structs have no offsetof array
	2072	} else {
[adc6781]	2073	ObjectDecl *sizeVar = makeVar( sizeofName( typeName ), layoutType );
	2074	ObjectDecl *alignVar = makeVar( alignofName( typeName ), layoutType->clone() );
	2075	ObjectDecl *offsetVar = makeVar( offsetofName( typeName ), new ArrayType( Type::Qualifiers(), layoutType->clone(), new ConstantExpr( Constant::from( n_members ) ), false, false ) );
[8a34677]	2076
	2077	// generate call to layout function
[adc6781]	2078	UntypedExpr *layoutCall = new UntypedExpr( new NameExpr( layoutofName( structTy->get_baseStruct() ) ) );
[8a34677]	2079	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( sizeVar ) ) );
	2080	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( alignVar ) ) );
	2081	layoutCall->get_args().push_back( new VariableExpr( offsetVar ) );
	2082	addOtypeParamsToLayoutCall( layoutCall, otypeParams );
	2083
	2084	stmtsToAdd.push_back( new ExprStmt( noLabels, layoutCall ) );
	2085	}
	2086
	2087	return true;
	2088	} else if ( UnionInstType unionTy = dynamic_cast< UnionInstType >( ty ) ) {
	2089	// check if this type already has a layout generated for it
[adc6781]	2090	std::string typeName = mangleType( ty );
	2091	if ( knownLayouts.find( typeName ) != knownLayouts.end() ) return true;
[8a34677]	2092
	2093	// check if any of the type parameters have dynamic layout; if none do, this type is (or will be) monomorphized
	2094	std::list< Type* > otypeParams;
	2095	if ( ! findGenericParams( *unionTy->get_baseParameters(), unionTy->get_parameters(), otypeParams ) ) return false;
	2096
	2097	// insert local variables for layout and generate call to layout function
[adc6781]	2098	knownLayouts.insert( typeName ); // done early so as not to interfere with the later addition of parameters to the layout call
[8a34677]	2099	Type *layoutType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
	2100
[adc6781]	2101	ObjectDecl *sizeVar = makeVar( sizeofName( typeName ), layoutType );
	2102	ObjectDecl *alignVar = makeVar( alignofName( typeName ), layoutType->clone() );
[8a34677]	2103
	2104	// generate call to layout function
[adc6781]	2105	UntypedExpr *layoutCall = new UntypedExpr( new NameExpr( layoutofName( unionTy->get_baseUnion() ) ) );
[8a34677]	2106	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( sizeVar ) ) );
	2107	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( alignVar ) ) );
	2108	addOtypeParamsToLayoutCall( layoutCall, otypeParams );
	2109
	2110	stmtsToAdd.push_back( new ExprStmt( noLabels, layoutCall ) );
	2111
	2112	return true;
	2113	}
	2114
	2115	return false;
	2116	}
	2117
	2118	Expression PolyGenericCalculator::mutate( SizeofExpr sizeofExpr ) {
	2119	Type *ty = sizeofExpr->get_type();
	2120	if ( findGeneric( ty ) ) {
[adc6781]	2121	Expression *ret = new NameExpr( sizeofName( mangleType( ty ) ) );
[8a34677]	2122	delete sizeofExpr;
	2123	return ret;
	2124	}
	2125	return sizeofExpr;
	2126	}
	2127
	2128	Expression PolyGenericCalculator::mutate( AlignofExpr alignofExpr ) {
	2129	Type *ty = alignofExpr->get_type();
	2130	if ( findGeneric( ty ) ) {
[adc6781]	2131	Expression *ret = new NameExpr( alignofName( mangleType( ty ) ) );
[8a34677]	2132	delete alignofExpr;
	2133	return ret;
	2134	}
	2135	return alignofExpr;
	2136	}
	2137
	2138	Expression PolyGenericCalculator::mutate( OffsetofExpr offsetofExpr ) {
[2a4b088]	2139	// mutate, exiting early if no longer OffsetofExpr
	2140	Expression *expr = Mutator::mutate( offsetofExpr );
	2141	offsetofExpr = dynamic_cast< OffsetofExpr* >( expr );
	2142	if ( ! offsetofExpr ) return expr;
	2143
	2144	// only mutate expressions for polymorphic structs/unions
[8a34677]	2145	Type *ty = offsetofExpr->get_type();
	2146	if ( ! findGeneric( ty ) ) return offsetofExpr;
[2a4b088]	2147
	2148	if ( StructInstType structType = dynamic_cast< StructInstType >( ty ) ) {
	2149	// replace offsetof expression by index into offset array
	2150	long i = findMember( offsetofExpr->get_member(), structType->get_baseStruct()->get_members() );
	2151	if ( i == -1 ) return offsetofExpr;
	2152
	2153	Expression *offsetInd = makeOffsetIndex( ty, i );
	2154	delete offsetofExpr;
	2155	return offsetInd;
[5c52b06]	2156	} else if ( dynamic_cast< UnionInstType* >( ty ) ) {
[2a4b088]	2157	// all union members are at offset zero
	2158	delete offsetofExpr;
	2159	return new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), std::string("0") ) );
	2160	} else return offsetofExpr;
[05d47278]	2161	}
	2162
[8a34677]	2163	Expression PolyGenericCalculator::mutate( OffsetPackExpr offsetPackExpr ) {
	2164	StructInstType *ty = offsetPackExpr->get_type();
	2165
	2166	Expression *ret = 0;
	2167	if ( findGeneric( ty ) ) {
	2168	// pull offset back from generated type information
[adc6781]	2169	ret = new NameExpr( offsetofName( mangleType( ty ) ) );
[8a34677]	2170	} else {
[adc6781]	2171	std::string offsetName = offsetofName( mangleType( ty ) );
[8a34677]	2172	if ( knownOffsets.find( offsetName ) != knownOffsets.end() ) {
	2173	// use the already-generated offsets for this type
	2174	ret = new NameExpr( offsetName );
	2175	} else {
	2176	knownOffsets.insert( offsetName );
	2177
	2178	std::list< Declaration* > &baseMembers = ty->get_baseStruct()->get_members();
	2179	Type *offsetType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
	2180
	2181	// build initializer list for offset array
	2182	std::list< Initializer* > inits;
	2183	for ( std::list< Declaration* >::const_iterator member = baseMembers.begin(); member != baseMembers.end(); ++member ) {
	2184	DeclarationWithType *memberDecl;
	2185	if ( DeclarationWithType origMember = dynamic_cast< DeclarationWithType >( *member ) ) {
	2186	memberDecl = origMember->clone();
	2187	} else {
	2188	memberDecl = new ObjectDecl( (*member)->get_name(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, offsetType->clone(), 0 );
	2189	}
	2190	inits.push_back( new SingleInit( new OffsetofExpr( ty->clone(), memberDecl ) ) );
	2191	}
	2192
	2193	// build the offset array and replace the pack with a reference to it
	2194	ObjectDecl *offsetArray = makeVar( offsetName, new ArrayType( Type::Qualifiers(), offsetType, new ConstantExpr( Constant::from( baseMembers.size() ) ), false, false ),
	2195	new ListInit( inits ) );
	2196	ret = new VariableExpr( offsetArray );
	2197	}
	2198	}
	2199
	2200	delete offsetPackExpr;
	2201	return ret;
	2202	}
	2203
	2204	void PolyGenericCalculator::doBeginScope() {
	2205	knownLayouts.beginScope();
	2206	knownOffsets.beginScope();
	2207	}
	2208
	2209	void PolyGenericCalculator::doEndScope() {
	2210	knownLayouts.endScope();
[adc6781]	2211	knownOffsets.endScope();
[8a34677]	2212	}
	2213
[05d47278]	2214	////////////////////////////////////////// Pass3 ////////////////////////////////////////////////////
	2215
	2216	template< typename DeclClass >
	2217	DeclClass * Pass3::handleDecl( DeclClass decl, Type type ) {
[6f49cdf]	2218	scopeTyVars.beginScope();
[05d47278]	2219	makeTyVarMap( type, scopeTyVars );
	2220
	2221	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
	2222	ScrubTyVars::scrub( decl, scopeTyVars );
	2223
[6f49cdf]	2224	scopeTyVars.endScope();
[05d47278]	2225	return ret;
	2226	}
	2227
	2228	ObjectDecl * Pass3::mutate( ObjectDecl *objectDecl ) {
	2229	return handleDecl( objectDecl, objectDecl->get_type() );
	2230	}
	2231
	2232	DeclarationWithType * Pass3::mutate( FunctionDecl *functionDecl ) {
	2233	return handleDecl( functionDecl, functionDecl->get_functionType() );
	2234	}
	2235
	2236	TypedefDecl * Pass3::mutate( TypedefDecl *typedefDecl ) {
	2237	return handleDecl( typedefDecl, typedefDecl->get_base() );
	2238	}
	2239
	2240	TypeDecl * Pass3::mutate( TypeDecl *typeDecl ) {
	2241	// Initializer *init = 0;
	2242	// std::list< Expression *> designators;
	2243	// scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
	2244	// if ( typeDecl->get_base() ) {
	2245	// init = new SimpleInit( new SizeofExpr( handleDecl( typeDecl, typeDecl->get_base() ) ), designators );
	2246	// }
	2247	// return new ObjectDecl( typeDecl->get_name(), Declaration::Extern, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::UnsignedInt ), init );
	2248
	2249	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
	2250	return Mutator::mutate( typeDecl );
	2251	}
	2252
	2253	Type * Pass3::mutate( PointerType *pointerType ) {
[6f49cdf]	2254	scopeTyVars.beginScope();
[05d47278]	2255	makeTyVarMap( pointerType, scopeTyVars );
	2256
	2257	Type *ret = Mutator::mutate( pointerType );
	2258
[6f49cdf]	2259	scopeTyVars.endScope();
[05d47278]	2260	return ret;
	2261	}
	2262
	2263	Type * Pass3::mutate( FunctionType *functionType ) {
[6f49cdf]	2264	scopeTyVars.beginScope();
[05d47278]	2265	makeTyVarMap( functionType, scopeTyVars );
	2266
	2267	Type *ret = Mutator::mutate( functionType );
	2268
[6f49cdf]	2269	scopeTyVars.endScope();
[05d47278]	2270	return ret;
	2271	}
[01aeade]	2272	} // anonymous namespace
[51b73452]	2273	} // namespace GenPoly
[01aeade]	2274
[51587aa]	2275	// Local Variables: //
	2276	// tab-width: 4 //
	2277	// mode: c++ //
	2278	// compile-command: "make install" //
	2279	// End: //

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