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source: src/GenPoly/Box.cc@ 888cbe4

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Last change on this file since 888cbe4 was c2ad3c9, checked in by Aaron Moss <a3moss@…>, 9 years ago
fix explicit cast error for returning polymorphic types, also potential infinite loop in findGeneric
Property mode set to `100644`
File size: 109.7 KB

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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	//
7	// Box.cc --
8	//
9	// Author : Richard C. Bilson
10	// Created On : Mon May 18 07:44:20 2015
11	// Last Modified By : Rob Schluntz
12	// Last Modified On : Fri May 13 14:51:21 2016
13	// Update Count : 295
14	//
15
16	#include <algorithm>
17	#include <iterator>
18	#include <list>
19	#include <map>
20	#include <set>
21	#include <stack>
22	#include <string>
23	#include <utility>
24	#include <vector>
25	#include <cassert>
26
27	#include "Box.h"
28	#include "DeclMutator.h"
29	#include "PolyMutator.h"
30	#include "FindFunction.h"
31	#include "ScopedMap.h"
32	#include "ScopedSet.h"
33	#include "ScrubTyVars.h"
34
35	#include "Parser/ParseNode.h"
36
37	#include "SynTree/Constant.h"
38	#include "SynTree/Declaration.h"
39	#include "SynTree/Expression.h"
40	#include "SynTree/Initializer.h"
41	#include "SynTree/Mutator.h"
42	#include "SynTree/Statement.h"
43	#include "SynTree/Type.h"
44	#include "SynTree/TypeSubstitution.h"
45
46	#include "ResolvExpr/TypeEnvironment.h"
47	#include "ResolvExpr/TypeMap.h"
48	#include "ResolvExpr/typeops.h"
49
50	#include "SymTab/Indexer.h"
51	#include "SymTab/Mangler.h"
52
53	#include "Common/SemanticError.h"
54	#include "Common/UniqueName.h"
55	#include "Common/utility.h"
56
57	#include <ext/functional> // temporary
58
59	namespace GenPoly {
60	namespace {
61	const std::list<Label> noLabels;
62
63	FunctionType makeAdapterType( FunctionType adaptee, const TyVarMap &tyVars );
64
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 ) {}
70
71	TypeList( const TypeList &that ) : params() { cloneAll(that.params, params); }
72	TypeList( TypeList &&that ) : params( std::move( that.params ) ) {}
73
74	/// Extracts types from a list of TypeExpr*
75	TypeList( const std::list< TypeExpr* >& _params ) : params() {
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
81	TypeList& operator= ( const TypeList &that ) {
82	deleteAll( params );
83
84	params.clear();
85	cloneAll( that.params, params );
86
87	return *this;
88	}
89
90	TypeList& operator= ( TypeList &&that ) {
91	deleteAll( params );
92
93	params = std::move( that.params );
94
95	return *this;
96	}
97
98	~TypeList() { deleteAll( params ); }
99
100	bool operator== ( const TypeList& that ) const {
101	if ( params.size() != that.params.size() ) return false;
102
103	SymTab::Indexer dummy;
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
113	/// Maps a key and a TypeList to the some value, accounting for scope
114	template< typename Key, typename Value >
115	class InstantiationMap {
116	/// Wraps value for a specific (Key, TypeList) combination
117	typedef std::pair< TypeList, Value* > Instantiation;
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
121	typedef ScopedMap< Key*, ValueList > InnerMap;
122
123	InnerMap instantiations; ///< instantiations
124
125	public:
126	/// Starts a new scope
127	void beginScope() { instantiations.beginScope(); }
128
129	/// Ends a scope
130	void endScope() { instantiations.endScope(); }
131
132	/// Gets the value for the (key, typeList) pair, returns NULL on none such.
133	Value lookup( Key key, const std::list< TypeExpr* >& params ) const {
134	TypeList typeList( params );
135
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 ) {
139	if ( inst->first == typeList ) return inst->second;
140	}
141	}
142	// no matching instantiations found
143	return 0;
144	}
145
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 ) {
148	instantiations[ key ].push_back( Instantiation( TypeList( params ), value ) );
149	}
150	};
151
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	};
162
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
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 );
174	virtual Statement * mutate( ReturnStmt *returnStmt );
175	virtual Type mutate( PointerType pointerType );
176	virtual Type * mutate( FunctionType *functionType );
177
178	virtual void doBeginScope();
179	virtual void doEndScope();
180	private:
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 );
183	/// passes extra type parameters into a polymorphic function application
184	void passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars );
185	/// wraps a function application with a new temporary for the out-parameter return value
186	Expression addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg );
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 );
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 );
198	/// Stores assignment operators from assertion list in local map of assignment operations
199	void findTypeOps( 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 );
202	/// Replaces intrinsic operator functions with their arithmetic desugaring
203	Expression handleIntrinsics( ApplicationExpr appExpr );
204	/// Inserts a new temporary variable into the current scope with an auto-generated name
205	ObjectDecl makeTemporary( Type type );
206
207	ScopedMap< std::string, DeclarationWithType* > assignOps; ///< Currently known type variable assignment operators
208	ScopedMap< std::string, DeclarationWithType* > ctorOps; ///< Currently known type variable constructors
209	ScopedMap< std::string, DeclarationWithType* > copyOps; ///< Currently known type variable copy constructors
210	ScopedMap< std::string, DeclarationWithType* > dtorOps; ///< Currently known type variable destructors
211	ResolvExpr::TypeMap< DeclarationWithType > scopedAssignOps; ///< Currently known assignment operators
212	ResolvExpr::TypeMap< DeclarationWithType > scopedCtorOps; ///< Currently known assignment operators
213	ResolvExpr::TypeMap< DeclarationWithType > scopedCopyOps; ///< Currently known assignment operators
214	ResolvExpr::TypeMap< DeclarationWithType > scopedDtorOps; ///< Currently known assignment operators
215	ScopedMap< std::string, DeclarationWithType* > adapters; ///< Set of adapter functions in the current scope
216
217	DeclarationWithType *retval;
218	bool useRetval;
219	UniqueName tempNamer;
220	};
221
222	/// * Moves polymorphic returns in function types to pointer-type parameters
223	/// * adds type size and assertion parameters to parameter lists
224	class Pass2 : public PolyMutator {
225	public:
226	template< typename DeclClass >
227	DeclClass handleDecl( DeclClass decl, Type *type );
228	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
229	virtual ObjectDecl mutate( ObjectDecl objectDecl );
230	virtual TypeDecl mutate( TypeDecl typeDecl );
231	virtual TypedefDecl mutate( TypedefDecl typedefDecl );
232	virtual Type mutate( PointerType pointerType );
233	virtual Type mutate( FunctionType funcType );
234
235	private:
236	void addAdapters( FunctionType *functionType );
237
238	std::map< UniqueId, std::string > adapterName;
239	};
240
241	/// Mutator pass that replaces concrete instantiations of generic types with actual struct declarations, scoped appropriately
242	class GenericInstantiator : public DeclMutator {
243	/// Map of (generic type, parameter list) pairs to concrete type instantiations
244	InstantiationMap< AggregateDecl, AggregateDecl > instantiations;
245	/// Namer for concrete types
246	UniqueName typeNamer;
247
248	public:
249	GenericInstantiator() : DeclMutator(), instantiations(), typeNamer("_conc_") {}
250
251	virtual Type* mutate( StructInstType *inst );
252	virtual Type* mutate( UnionInstType *inst );
253
254	// virtual Expression* mutate( MemberExpr *memberExpr );
255
256	virtual void doBeginScope();
257	virtual void doEndScope();
258	private:
259	/// Wrap instantiation lookup for structs
260	StructDecl* lookup( StructInstType inst, const std::list< TypeExpr > &typeSubs ) { return (StructDecl*)instantiations.lookup( inst->get_baseStruct(), typeSubs ); }
261	/// Wrap instantiation lookup for unions
262	UnionDecl* lookup( UnionInstType inst, const std::list< TypeExpr > &typeSubs ) { return (UnionDecl*)instantiations.lookup( inst->get_baseUnion(), typeSubs ); }
263	/// Wrap instantiation insertion for structs
264	void insert( StructInstType inst, const std::list< TypeExpr > &typeSubs, StructDecl *decl ) { instantiations.insert( inst->get_baseStruct(), typeSubs, decl ); }
265	/// Wrap instantiation insertion for unions
266	void insert( UnionInstType inst, const std::list< TypeExpr > &typeSubs, UnionDecl *decl ) { instantiations.insert( inst->get_baseUnion(), typeSubs, decl ); }
267	};
268
269	/// Replaces member and size/align/offsetof expressions on polymorphic generic types with calculated expressions.
270	/// * Replaces member expressions for polymorphic types with calculated add-field-offset-and-dereference
271	/// * Calculates polymorphic offsetof expressions from offset array
272	/// * Inserts dynamic calculation of polymorphic type layouts where needed
273	class PolyGenericCalculator : public PolyMutator {
274	public:
275	template< typename DeclClass >
276	DeclClass handleDecl( DeclClass decl, Type *type );
277	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
278	virtual ObjectDecl mutate( ObjectDecl objectDecl );
279	virtual TypedefDecl mutate( TypedefDecl objectDecl );
280	virtual TypeDecl mutate( TypeDecl objectDecl );
281	virtual Statement mutate( DeclStmt declStmt );
282	virtual Type mutate( PointerType pointerType );
283	virtual Type mutate( FunctionType funcType );
284	virtual Expression mutate( MemberExpr memberExpr );
285	virtual Expression mutate( SizeofExpr sizeofExpr );
286	virtual Expression mutate( AlignofExpr alignofExpr );
287	virtual Expression mutate( OffsetofExpr offsetofExpr );
288	virtual Expression mutate( OffsetPackExpr offsetPackExpr );
289
290	virtual void doBeginScope();
291	virtual void doEndScope();
292
293	private:
294	/// Makes a new variable in the current scope with the given name, type & optional initializer
295	ObjectDecl makeVar( const std::string &name, Type type, Initializer *init = 0 );
296	/// returns true if the type has a dynamic layout; such a layout will be stored in appropriately-named local variables when the function returns
297	bool findGeneric( Type *ty );
298	/// adds type parameters to the layout call; will generate the appropriate parameters if needed
299	void addOtypeParamsToLayoutCall( UntypedExpr layoutCall, const std::list< Type > &otypeParams );
300
301	/// Enters a new scope for type-variables, adding the type variables from ty
302	void beginTypeScope( Type *ty );
303	/// Exits the type-variable scope
304	void endTypeScope();
305
306	ScopedSet< std::string > knownLayouts; ///< Set of generic type layouts known in the current scope, indexed by sizeofName
307	ScopedSet< std::string > knownOffsets; ///< Set of non-generic types for which the offset array exists in the current scope, indexed by offsetofName
308	};
309
310	/// 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
311	class Pass3 : public PolyMutator {
312	public:
313	template< typename DeclClass >
314	DeclClass handleDecl( DeclClass decl, Type *type );
315	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
316	virtual ObjectDecl mutate( ObjectDecl objectDecl );
317	virtual TypedefDecl mutate( TypedefDecl objectDecl );
318	virtual TypeDecl mutate( TypeDecl objectDecl );
319	virtual Type mutate( PointerType pointerType );
320	virtual Type mutate( FunctionType funcType );
321	private:
322	};
323
324	} // anonymous namespace
325
326	/// version of mutateAll with special handling for translation unit so you can check the end of the prelude when debugging
327	template< typename MutatorType >
328	inline void mutateTranslationUnit( std::list< Declaration* > &translationUnit, MutatorType &mutator ) {
329	bool seenIntrinsic = false;
330	SemanticError errors;
331	for ( typename std::list< Declaration* >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) {
332	try {
333	if ( *i ) {
334	if ( (*i)->get_linkage() == LinkageSpec::Intrinsic ) {
335	seenIntrinsic = true;
336	} else if ( seenIntrinsic ) {
337	seenIntrinsic = false; // break on this line when debugging for end of prelude
338	}
339
340	i = dynamic_cast< Declaration >( (*i)->acceptMutator( mutator ) );
341	assert( *i );
342	} // if
343	} catch( SemanticError &e ) {
344	errors.append( e );
345	} // try
346	} // for
347	if ( ! errors.isEmpty() ) {
348	throw errors;
349	} // if
350	}
351
352	void box( std::list< Declaration *>& translationUnit ) {
353	LayoutFunctionBuilder layoutBuilder;
354	Pass1 pass1;
355	Pass2 pass2;
356	GenericInstantiator instantiator;
357	PolyGenericCalculator polyCalculator;
358	Pass3 pass3;
359
360	layoutBuilder.mutateDeclarationList( translationUnit );
361	mutateTranslationUnit/All/( translationUnit, pass1 );
362	mutateTranslationUnit/All/( translationUnit, pass2 );
363	instantiator.mutateDeclarationList( translationUnit );
364	mutateTranslationUnit/All/( translationUnit, polyCalculator );
365	mutateTranslationUnit/All/( translationUnit, pass3 );
366	}
367
368	////////////////////////////////// LayoutFunctionBuilder ////////////////////////////////////////////
369
370	DeclarationWithType LayoutFunctionBuilder::mutate( FunctionDecl functionDecl ) {
371	functionDecl->set_functionType( maybeMutate( functionDecl->get_functionType(), *this ) );
372	mutateAll( functionDecl->get_oldDecls(), *this );
373	++functionNesting;
374	functionDecl->set_statements( maybeMutate( functionDecl->get_statements(), *this ) );
375	--functionNesting;
376	return functionDecl;
377	}
378
379	/// Get a list of type declarations that will affect a layout function
380	std::list< TypeDecl* > takeOtypeOnly( std::list< TypeDecl* > &decls ) {
381	std::list< TypeDecl * > otypeDecls;
382
383	for ( std::list< TypeDecl* >::const_iterator decl = decls.begin(); decl != decls.end(); ++decl ) {
384	if ( (*decl)->get_kind() == TypeDecl::Any ) {
385	otypeDecls.push_back( *decl );
386	}
387	}
388
389	return otypeDecls;
390	}
391
392	/// Adds parameters for otype layout to a function type
393	void addOtypeParams( FunctionType layoutFnType, std::list< TypeDecl > &otypeParams ) {
394	BasicType sizeAlignType( Type::Qualifiers(), BasicType::LongUnsignedInt );
395
396	for ( std::list< TypeDecl* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
397	TypeInstType paramType( Type::Qualifiers(), (param)->get_name(), param );
398	std::string paramName = mangleType( &paramType );
399	layoutFnType->get_parameters().push_back( new ObjectDecl( sizeofName( paramName ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
400	layoutFnType->get_parameters().push_back( new ObjectDecl( alignofName( paramName ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
401	}
402	}
403
404	/// Builds a layout function declaration
405	FunctionDecl buildLayoutFunctionDecl( AggregateDecl typeDecl, unsigned int functionNesting, FunctionType *layoutFnType ) {
406	// Routines at global scope marked "static" to prevent multiple definitions is separate translation units
407	// because each unit generates copies of the default routines for each aggregate.
408	FunctionDecl *layoutDecl = new FunctionDecl(
409	layoutofName( typeDecl ), functionNesting > 0 ? DeclarationNode::NoStorageClass : DeclarationNode::Static, LinkageSpec::AutoGen, layoutFnType, new CompoundStmt( noLabels ), true, false );
410	layoutDecl->fixUniqueId();
411	return layoutDecl;
412	}
413
414	/// Makes a unary operation
415	Expression makeOp( const std::string &name, Expression arg ) {
416	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
417	expr->get_args().push_back( arg );
418	return expr;
419	}
420
421	/// Makes a binary operation
422	Expression makeOp( const std::string &name, Expression lhs, Expression *rhs ) {
423	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
424	expr->get_args().push_back( lhs );
425	expr->get_args().push_back( rhs );
426	return expr;
427	}
428
429	/// Returns the dereference of a local pointer variable
430	Expression derefVar( ObjectDecl var ) {
431	return makeOp( "*?", new VariableExpr( var ) );
432	}
433
434	/// makes an if-statement with a single-expression if-block and no then block
435	Statement makeCond( Expression cond, Expression *ifPart ) {
436	return new IfStmt( noLabels, cond, new ExprStmt( noLabels, ifPart ), 0 );
437	}
438
439	/// makes a statement that assigns rhs to lhs if lhs < rhs
440	Statement makeAssignMax( Expression lhs, Expression *rhs ) {
441	return makeCond( makeOp( "?<?", lhs, rhs ), makeOp( "?=?", lhs->clone(), rhs->clone() ) );
442	}
443
444	/// makes a statement that aligns lhs to rhs (rhs should be an integer power of two)
445	Statement makeAlignTo( Expression lhs, Expression *rhs ) {
446	// check that the lhs is zeroed out to the level of rhs
447	Expression *ifCond = makeOp( "?&?", lhs, makeOp( "?-?", rhs, new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), "1" ) ) ) );
448	// if not aligned, increment to alignment
449	Expression *ifExpr = makeOp( "?+=?", lhs->clone(), makeOp( "?-?", rhs->clone(), ifCond->clone() ) );
450	return makeCond( ifCond, ifExpr );
451	}
452
453	/// adds an expression to a compound statement
454	void addExpr( CompoundStmt stmts, Expression expr ) {
455	stmts->get_kids().push_back( new ExprStmt( noLabels, expr ) );
456	}
457
458	/// adds a statement to a compound statement
459	void addStmt( CompoundStmt stmts, Statement stmt ) {
460	stmts->get_kids().push_back( stmt );
461	}
462
463	Declaration LayoutFunctionBuilder::mutate( StructDecl structDecl ) {
464	// do not generate layout function for "empty" tag structs
465	if ( structDecl->get_members().empty() ) return structDecl;
466
467	// get parameters that can change layout, exiting early if none
468	std::list< TypeDecl* > otypeParams = takeOtypeOnly( structDecl->get_parameters() );
469	if ( otypeParams.empty() ) return structDecl;
470
471	// build layout function signature
472	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
473	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
474	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
475
476	ObjectDecl *sizeParam = new ObjectDecl( sizeofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
477	layoutFnType->get_parameters().push_back( sizeParam );
478	ObjectDecl *alignParam = new ObjectDecl( alignofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
479	layoutFnType->get_parameters().push_back( alignParam );
480	ObjectDecl *offsetParam = new ObjectDecl( offsetofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
481	layoutFnType->get_parameters().push_back( offsetParam );
482	addOtypeParams( layoutFnType, otypeParams );
483
484	// build function decl
485	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( structDecl, functionNesting, layoutFnType );
486
487	// calculate struct layout in function body
488
489	// initialize size and alignment to 0 and 1 (will have at least one member to re-edit size
490	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "0" ) ) ) );
491	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
492	unsigned long n_members = 0;
493	bool firstMember = true;
494	for ( std::list< Declaration* >::const_iterator member = structDecl->get_members().begin(); member != structDecl->get_members().end(); ++member ) {
495	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
496	assert( dwt );
497	Type *memberType = dwt->get_type();
498
499	if ( firstMember ) {
500	firstMember = false;
501	} else {
502	// make sure all members after the first (automatically aligned at 0) are properly padded for alignment
503	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), new AlignofExpr( memberType->clone() ) ) );
504	}
505
506	// place current size in the current offset index
507	addExpr( layoutDecl->get_statements(), makeOp( "?=?", makeOp( "?[?]", new VariableExpr( offsetParam ), new ConstantExpr( Constant::from_ulong( n_members ) ) ),
508	derefVar( sizeParam ) ) );
509	++n_members;
510
511	// add member size to current size
512	addExpr( layoutDecl->get_statements(), makeOp( "?+=?", derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
513
514	// take max of member alignment and global alignment
515	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
516	}
517	// make sure the type is end-padded to a multiple of its alignment
518	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
519
520	addDeclarationAfter( layoutDecl );
521	return structDecl;
522	}
523
524	Declaration LayoutFunctionBuilder::mutate( UnionDecl unionDecl ) {
525	// do not generate layout function for "empty" tag unions
526	if ( unionDecl->get_members().empty() ) return unionDecl;
527
528	// get parameters that can change layout, exiting early if none
529	std::list< TypeDecl* > otypeParams = takeOtypeOnly( unionDecl->get_parameters() );
530	if ( otypeParams.empty() ) return unionDecl;
531
532	// build layout function signature
533	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
534	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
535	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
536
537	ObjectDecl *sizeParam = new ObjectDecl( sizeofName( unionDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
538	layoutFnType->get_parameters().push_back( sizeParam );
539	ObjectDecl *alignParam = new ObjectDecl( alignofName( unionDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
540	layoutFnType->get_parameters().push_back( alignParam );
541	addOtypeParams( layoutFnType, otypeParams );
542
543	// build function decl
544	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( unionDecl, functionNesting, layoutFnType );
545
546	// calculate union layout in function body
547	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
548	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
549	for ( std::list< Declaration* >::const_iterator member = unionDecl->get_members().begin(); member != unionDecl->get_members().end(); ++member ) {
550	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
551	assert( dwt );
552	Type *memberType = dwt->get_type();
553
554	// take max member size and global size
555	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
556
557	// take max of member alignment and global alignment
558	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
559	}
560	// make sure the type is end-padded to a multiple of its alignment
561	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
562
563	addDeclarationAfter( layoutDecl );
564	return unionDecl;
565	}
566
567	////////////////////////////////////////// Pass1 ////////////////////////////////////////////////////
568
569	namespace {
570	std::string makePolyMonoSuffix( FunctionType * function, const TyVarMap &tyVars ) {
571	std::stringstream name;
572
573	// NOTE: this function previously used isPolyObj, which failed to produce
574	// the correct thing in some situations. It's not clear to me why this wasn't working.
575
576	// if the return type or a parameter type involved polymorphic types, then the adapter will need
577	// to take those polymorphic types as pointers. Therefore, there can be two different functions
578	// with the same mangled name, so we need to further mangle the names.
579	for ( std::list< DeclarationWithType *>::iterator retval = function->get_returnVals().begin(); retval != function->get_returnVals().end(); ++retval ) {
580	if ( isPolyType( (*retval)->get_type(), tyVars ) ) {
581	name << "P";
582	} else {
583	name << "M";
584	}
585	}
586	name << "_";
587	std::list< DeclarationWithType *> &paramList = function->get_parameters();
588	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
589	if ( isPolyType( (*arg)->get_type(), tyVars ) ) {
590	name << "P";
591	} else {
592	name << "M";
593	}
594	} // for
595	return name.str();
596	}
597
598	std::string mangleAdapterName( FunctionType * function, const TyVarMap &tyVars ) {
599	return SymTab::Mangler::mangle( function ) + makePolyMonoSuffix( function, tyVars );
600	}
601
602	std::string makeAdapterName( const std::string &mangleName ) {
603	return "_adapter" + mangleName;
604	}
605
606	Pass1::Pass1() : useRetval( false ), tempNamer( "_temp" ) {}
607
608	/// Returns T if the given declaration is a function with parameter (T*) for some TypeInstType T, NULL otherwise
609	TypeInstType isTypeInstPtrFn( DeclarationWithType decl ) {
610	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
611	if ( funType->get_parameters().size() == 1 ) {
612	if ( PointerType pointer = dynamic_cast< PointerType >( funType->get_parameters().front()->get_type() ) ) {
613	if ( TypeInstType refType = dynamic_cast< TypeInstType >( pointer->get_base() ) ) {
614	return refType;
615	} // if
616	} // if
617	} // if
618	} // if
619	return 0;
620	}
621
622	/// Returns T if the given declaration is a function with parameters (T*, T) for some TypeInstType T, NULL otherwise
623	TypeInstType isTypeInstPtrValFn( DeclarationWithType decl ) {
624	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
625	if ( funType->get_parameters().size() == 2 ) {
626	if ( PointerType pointer = dynamic_cast< PointerType >( funType->get_parameters().front()->get_type() ) ) {
627	if ( TypeInstType refType = dynamic_cast< TypeInstType >( pointer->get_base() ) ) {
628	if ( TypeInstType refType2 = dynamic_cast< TypeInstType >( funType->get_parameters().back()->get_type() ) ) {
629	if ( refType->get_name() == refType2->get_name() ) {
630	return refType;
631	} // if
632	} // if
633	} // if
634	} // if
635	} // if
636	} // if
637	return 0;
638	}
639
640	/// Returns T if the given declaration is (?=?)(T , T) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
641	TypeInstType isTypeInstAssignment( DeclarationWithType decl ) {
642	return decl->get_name() == "?=?" ? isTypeInstPtrValFn( decl ) : 0;
643	}
644
645	/// Returns T if the given declaration is (?{})(T ) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
646	TypeInstType isTypeInstCtor( DeclarationWithType decl ) {
647	return decl->get_name() == "?{}" ? isTypeInstPtrFn( decl ) : 0;
648	}
649
650	/// Returns T if the given declaration is (?{})(T , T) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
651	TypeInstType isTypeInstCopy( DeclarationWithType decl ) {
652	return decl->get_name() == "?{}" ? isTypeInstPtrValFn( decl ) : 0;
653	}
654
655	/// Returns T if the given declaration is (^?{})(T ) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
656	TypeInstType isTypeInstDtor( DeclarationWithType decl ) {
657	return decl->get_name() == "^?{}" ? isTypeInstPtrFn( decl ) : 0;
658	}
659
660	/// Returns T if the given declaration is a function with parameters (T*, T) for some type T, where neither parameter is cv-qualified,
661	/// NULL otherwise
662	Type isNoCvPtrFn( DeclarationWithType decl ) {
663	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
664	if ( funType->get_parameters().size() == 1 ) {
665	Type::Qualifiers defaultQualifiers;
666	Type *paramType = funType->get_parameters().front()->get_type();
667	if ( paramType->get_qualifiers() != defaultQualifiers ) return 0;
668
669	if ( PointerType pointerType = dynamic_cast< PointerType >( paramType ) ) {
670	Type *baseType = pointerType->get_base();
671	if ( baseType->get_qualifiers() == defaultQualifiers ) {
672	return baseType;
673	} // if
674	} // if
675	} // if
676	} // if
677	return 0;
678	}
679
680	/// Returns T if the given declaration is a function with parameters (T*, T) for some type T, where neither parameter is cv-qualified,
681	/// NULL otherwise
682	Type isNoCvPtrValFn( DeclarationWithType decl ) {
683	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
684	if ( funType->get_parameters().size() == 2 ) {
685	Type::Qualifiers defaultQualifiers;
686	Type *paramType1 = funType->get_parameters().front()->get_type();
687	if ( paramType1->get_qualifiers() != defaultQualifiers ) return 0;
688	Type *paramType2 = funType->get_parameters().back()->get_type();
689	if ( paramType2->get_qualifiers() != defaultQualifiers ) return 0;
690
691	if ( PointerType pointerType = dynamic_cast< PointerType >( paramType1 ) ) {
692	Type *baseType1 = pointerType->get_base();
693	if ( baseType1->get_qualifiers() != defaultQualifiers ) return 0;
694	SymTab::Indexer dummy;
695	if ( ResolvExpr::typesCompatible( baseType1, paramType2, dummy ) ) {
696	return baseType1;
697	} // if
698	} // if
699	} // if
700	} // if
701	return 0;
702	}
703
704	/// returns T if the given declaration is: (?=?)(T , T) for some type T (return not checked, but maybe should be), NULL otherwise
705	/// Only picks assignments where neither parameter is cv-qualified
706	Type isAssignment( DeclarationWithType decl ) {
707	return decl->get_name() == "?=?" ? isNoCvPtrValFn( decl ) : 0;
708	}
709
710	/// returns T if the given declaration is: (?{})(T ) for some type T, NULL otherwise
711	/// Only picks ctors where the parameter is not cv-qualified
712	Type isCtor( DeclarationWithType decl ) {
713	return decl->get_name() == "?{}" ? isNoCvPtrFn( decl ) : 0;
714	}
715
716	/// returns T if the given declaration is: (?{})(T , T) for some type T (return not checked, but maybe should be), NULL otherwise
717	/// Only picks copy constructors where neither parameter is cv-qualified
718	Type isCopy( DeclarationWithType decl ) {
719	return decl->get_name() == "?{}" ? isNoCvPtrValFn( decl ) : 0;
720	}
721
722	/// returns T if the given declaration is: (?{})(T ) for some type T, NULL otherwise
723	/// Only picks ctors where the parameter is not cv-qualified
724	Type isDtor( DeclarationWithType decl ) {
725	return decl->get_name() == "^?{}" ? isNoCvPtrFn( decl ) : 0;
726	}
727
728	void Pass1::findTypeOps( const std::list< TypeDecl *> &forall ) {
729	// what if a nested function uses an assignment operator?
730	// assignOps.clear();
731	for ( std::list< TypeDecl *>::const_iterator i = forall.begin(); i != forall.end(); ++i ) {
732	for ( std::list< DeclarationWithType >::const_iterator assert = (i)->get_assertions().begin(); assert != (*i)->get_assertions().end(); ++assert ) {
733	std::string typeName;
734	if ( TypeInstType typeInst = isTypeInstAssignment( assert ) ) {
735	assignOps[ typeInst->get_name() ] = *assert;
736	} else if ( TypeInstType typeInst = isTypeInstCtor( assert ) ) {
737	ctorOps[ typeInst->get_name() ] = *assert;
738	} else if ( TypeInstType typeInst = isTypeInstCopy( assert ) ) {
739	copyOps[ typeInst->get_name() ] = *assert;
740	} else if ( TypeInstType typeInst = isTypeInstDtor( assert ) ) {
741	dtorOps[ typeInst->get_name() ] = *assert;
742	} // if
743	} // for
744	} // for
745	}
746
747	DeclarationWithType Pass1::mutate( FunctionDecl functionDecl ) {
748	// if this is a assignment function, put it in the map for this scope
749	if ( Type *paramType = isAssignment( functionDecl ) ) {
750	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
751	scopedAssignOps.insert( paramType, functionDecl );
752	}
753	} else if ( Type *paramType = isCtor( functionDecl ) ) {
754	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
755	scopedCtorOps.insert( paramType, functionDecl );
756	}
757	} else if ( Type *paramType = isCopy( functionDecl ) ) {
758	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
759	scopedCopyOps.insert( paramType, functionDecl );
760	}
761	} else if ( Type *paramType = isDtor( functionDecl ) ) {
762	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
763	scopedDtorOps.insert( paramType, functionDecl );
764	}
765	}
766
767	if ( functionDecl->get_statements() ) { // empty routine body ?
768	doBeginScope();
769	scopeTyVars.beginScope();
770	assignOps.beginScope();
771	ctorOps.beginScope();
772	copyOps.beginScope();
773	dtorOps.beginScope();
774
775	DeclarationWithType *oldRetval = retval;
776	bool oldUseRetval = useRetval;
777
778	// process polymorphic return value
779	retval = 0;
780	if ( isPolyRet( functionDecl->get_functionType() ) && functionDecl->get_linkage() == LinkageSpec::Cforall ) {
781	retval = functionDecl->get_functionType()->get_returnVals().front();
782
783	// give names to unnamed return values
784	if ( retval->get_name() == "" ) {
785	retval->set_name( "_retparm" );
786	retval->set_linkage( LinkageSpec::C );
787	} // if
788	} // if
789
790	FunctionType *functionType = functionDecl->get_functionType();
791	makeTyVarMap( functionDecl->get_functionType(), scopeTyVars );
792	findTypeOps( functionDecl->get_functionType()->get_forall() );
793
794	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
795	std::list< FunctionType *> functions;
796	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
797	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
798	findFunction( (*assert)->get_type(), functions, scopeTyVars, needsAdapter );
799	} // for
800	} // for
801	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
802	findFunction( (*arg)->get_type(), functions, scopeTyVars, needsAdapter );
803	} // for
804
805	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
806	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
807	if ( adapters.find( mangleName ) == adapters.end() ) {
808	std::string adapterName = makeAdapterName( mangleName );
809	adapters.insert( std::pair< std::string, DeclarationWithType >( mangleName, new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( funType, scopeTyVars ) ), 0 ) ) );
810	} // if
811	} // for
812
813	functionDecl->set_statements( functionDecl->get_statements()->acceptMutator( *this ) );
814
815	scopeTyVars.endScope();
816	assignOps.endScope();
817	ctorOps.endScope();
818	copyOps.endScope();
819	dtorOps.endScope();
820	retval = oldRetval;
821	useRetval = oldUseRetval;
822	doEndScope();
823	} // if
824	return functionDecl;
825	}
826
827	TypeDecl Pass1::mutate( TypeDecl typeDecl ) {
828	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
829	return Mutator::mutate( typeDecl );
830	}
831
832	Expression Pass1::mutate( CommaExpr commaExpr ) {
833	bool oldUseRetval = useRetval;
834	useRetval = false;
835	commaExpr->set_arg1( maybeMutate( commaExpr->get_arg1(), *this ) );
836	useRetval = oldUseRetval;
837	commaExpr->set_arg2( maybeMutate( commaExpr->get_arg2(), *this ) );
838	return commaExpr;
839	}
840
841	Expression Pass1::mutate( ConditionalExpr condExpr ) {
842	bool oldUseRetval = useRetval;
843	useRetval = false;
844	condExpr->set_arg1( maybeMutate( condExpr->get_arg1(), *this ) );
845	useRetval = oldUseRetval;
846	condExpr->set_arg2( maybeMutate( condExpr->get_arg2(), *this ) );
847	condExpr->set_arg3( maybeMutate( condExpr->get_arg3(), *this ) );
848	return condExpr;
849
850	}
851
852	void Pass1::passArgTypeVars( ApplicationExpr appExpr, Type parmType, Type argBaseType, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars, std::set< std::string > &seenTypes ) {
853	Type *polyType = isPolyType( parmType, exprTyVars );
854	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
855	std::string typeName = mangleType( polyType );
856	if ( seenTypes.count( typeName ) ) return;
857
858	arg = appExpr->get_args().insert( arg, new SizeofExpr( argBaseType->clone() ) );
859	arg++;
860	arg = appExpr->get_args().insert( arg, new AlignofExpr( argBaseType->clone() ) );
861	arg++;
862	if ( dynamic_cast< StructInstType* >( polyType ) ) {
863	if ( StructInstType argBaseStructType = dynamic_cast< StructInstType >( argBaseType ) ) {
864	// zero-length arrays are forbidden by C, so don't pass offset for empty struct
865	if ( ! argBaseStructType->get_baseStruct()->get_members().empty() ) {
866	arg = appExpr->get_args().insert( arg, new OffsetPackExpr( argBaseStructType->clone() ) );
867	arg++;
868	}
869	} else {
870	throw SemanticError( "Cannot pass non-struct type for generic struct" );
871	}
872	}
873
874	seenTypes.insert( typeName );
875	}
876	}
877
878	void Pass1::passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
879	// pass size/align for type variables
880	for ( TyVarMap::const_iterator tyParm = exprTyVars.begin(); tyParm != exprTyVars.end(); ++tyParm ) {
881	ResolvExpr::EqvClass eqvClass;
882	assert( env );
883	if ( tyParm->second == TypeDecl::Any ) {
884	Type *concrete = env->lookup( tyParm->first );
885	if ( concrete ) {
886	arg = appExpr->get_args().insert( arg, new SizeofExpr( concrete->clone() ) );
887	arg++;
888	arg = appExpr->get_args().insert( arg, new AlignofExpr( concrete->clone() ) );
889	arg++;
890	} else {
891	/// xxx - should this be an assertion?
892	throw SemanticError( "unbound type variable: " + tyParm->first + " in application ", appExpr );
893	} // if
894	} // if
895	} // for
896
897	// add size/align for generic types to parameter list
898	if ( appExpr->get_function()->get_results().empty() ) return;
899	FunctionType *funcType = getFunctionType( appExpr->get_function()->get_results().front() );
900	assert( funcType );
901
902	std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin();
903	std::list< Expression* >::const_iterator fnArg = arg;
904	std::set< std::string > seenTypes; //< names for generic types we've seen
905
906	// a polymorphic return type may need to be added to the argument list
907	if ( polyRetType ) {
908	Type *concRetType = replaceWithConcrete( appExpr, polyRetType );
909	passArgTypeVars( appExpr, polyRetType, concRetType, arg, exprTyVars, seenTypes );
910	}
911
912	// add type information args for presently unseen types in parameter list
913	for ( ; fnParm != funcType->get_parameters().end() && fnArg != appExpr->get_args().end(); ++fnParm, ++fnArg ) {
914	VariableExpr fnArgBase = getBaseVar( fnArg );
915	if ( ! fnArgBase \|\| fnArgBase->get_results().empty() ) continue;
916	passArgTypeVars( appExpr, (*fnParm)->get_type(), fnArgBase->get_results().front(), arg, exprTyVars, seenTypes );
917	}
918	}
919
920	ObjectDecl Pass1::makeTemporary( Type type ) {
921	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, 0 );
922	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
923	return newObj;
924	}
925
926	Expression Pass1::addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg ) {
927	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
928	// if ( useRetval ) {
929	// assert( retval );
930	// arg = appExpr->get_args().insert( arg, new VariableExpr( retval ) );
931	// arg++;
932	// } else {
933
934	// Create temporary to hold return value of polymorphic function and produce that temporary as a result
935	// using a comma expression. Possibly change comma expression into statement expression "{}" for multiple
936	// return values.
937	ObjectDecl *newObj = makeTemporary( retType->clone() );
938	Expression *paramExpr = new VariableExpr( newObj );
939
940	// If the type of the temporary is not polymorphic, box temporary by taking its address;
941	// otherwise the temporary is already boxed and can be used directly.
942	if ( ! isPolyType( newObj->get_type(), scopeTyVars, env ) ) {
943	paramExpr = new AddressExpr( paramExpr );
944	} // if
945	arg = appExpr->get_args().insert( arg, paramExpr ); // add argument to function call
946	arg++;
947	// Build a comma expression to call the function and emulate a normal return.
948	CommaExpr *commaExpr = new CommaExpr( appExpr, new VariableExpr( newObj ) );
949	commaExpr->set_env( appExpr->get_env() );
950	appExpr->set_env( 0 );
951	return commaExpr;
952	// } // if
953	// return appExpr;
954	}
955
956	void Pass1::replaceParametersWithConcrete( ApplicationExpr appExpr, std::list< Expression >& params ) {
957	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
958	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
959	assert(paramType && "Aggregate parameters should be type expressions");
960	paramType->set_type( replaceWithConcrete( appExpr, paramType->get_type(), false ) );
961	}
962	}
963
964	Type Pass1::replaceWithConcrete( ApplicationExpr appExpr, Type *type, bool doClone ) {
965	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
966	Type *concrete = env->lookup( typeInst->get_name() );
967	if ( concrete == 0 ) {
968	throw SemanticError( "Unbound type variable " + typeInst->get_name() + " in ", appExpr );
969	} // if
970	return concrete;
971	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
972	if ( doClone ) {
973	structType = structType->clone();
974	}
975	replaceParametersWithConcrete( appExpr, structType->get_parameters() );
976	return structType;
977	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
978	if ( doClone ) {
979	unionType = unionType->clone();
980	}
981	replaceParametersWithConcrete( appExpr, unionType->get_parameters() );
982	return unionType;
983	}
984	return type;
985	}
986
987	Expression Pass1::addPolyRetParam( ApplicationExpr appExpr, FunctionType function, ReferenceToType polyType, std::list< Expression *>::iterator &arg ) {
988	assert( env );
989	Type *concrete = replaceWithConcrete( appExpr, polyType );
990	// add out-parameter for return value
991	return addRetParam( appExpr, function, concrete, arg );
992	}
993
994	Expression Pass1::applyAdapter( ApplicationExpr appExpr, FunctionType function, std::list< Expression >::iterator &arg, const TyVarMap &tyVars ) {
995	Expression *ret = appExpr;
996	if ( ! function->get_returnVals().empty() && isPolyType( function->get_returnVals().front()->get_type(), tyVars ) ) {
997	ret = addRetParam( appExpr, function, function->get_returnVals().front()->get_type(), arg );
998	} // if
999	std::string mangleName = mangleAdapterName( function, tyVars );
1000	std::string adapterName = makeAdapterName( mangleName );
1001
1002	// cast adaptee to void (*)(), since it may have any type inside a polymorphic function
1003	Type * adapteeType = new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) );
1004	appExpr->get_args().push_front( new CastExpr( appExpr->get_function(), adapteeType ) );
1005	appExpr->set_function( new NameExpr( adapterName ) );
1006
1007	return ret;
1008	}
1009
1010	void Pass1::boxParam( Type param, Expression &arg, const TyVarMap &exprTyVars ) {
1011	assert( ! arg->get_results().empty() );
1012	if ( isPolyType( param, exprTyVars ) ) {
1013	if ( isPolyType( arg->get_results().front() ) ) {
1014	// if the argument's type is polymorphic, we don't need to box again!
1015	return;
1016	} else if ( arg->get_results().front()->get_isLvalue() ) {
1017	// VariableExpr and MemberExpr are lvalues; need to check this isn't coming from the second arg of a comma expression though (not an lvalue)
1018	// xxx - need to test that this code is still reachable
1019	if ( CommaExpr commaArg = dynamic_cast< CommaExpr >( arg ) ) {
1020	commaArg->set_arg2( new AddressExpr( commaArg->get_arg2() ) );
1021	} else {
1022	arg = new AddressExpr( arg );
1023	}
1024	} else {
1025	// use type computed in unification to declare boxed variables
1026	Type * newType = param->clone();
1027	if ( env ) env->apply( newType );
1028	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, newType, 0 );
1029	newObj->get_type()->get_qualifiers() = Type::Qualifiers(); // TODO: is this right???
1030	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
1031	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
1032	assign->get_args().push_back( new VariableExpr( newObj ) );
1033	assign->get_args().push_back( arg );
1034	stmtsToAdd.push_back( new ExprStmt( noLabels, assign ) );
1035	arg = new AddressExpr( new VariableExpr( newObj ) );
1036	} // if
1037	} // if
1038	}
1039
1040	/// cast parameters to polymorphic functions so that types are replaced with
1041	/// void * if they are type parameters in the formal type.
1042	/// this gets rid of warnings from gcc.
1043	void addCast( Expression &actual, Type formal, const TyVarMap &tyVars ) {
1044	Type * newType = formal->clone();
1045	if ( getFunctionType( newType ) ) {
1046	newType = ScrubTyVars::scrub( newType, tyVars );
1047	actual = new CastExpr( actual, newType );
1048	} // if
1049	}
1050
1051	void Pass1::boxParams( ApplicationExpr appExpr, FunctionType function, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
1052	for ( std::list< DeclarationWithType *>::const_iterator param = function->get_parameters().begin(); param != function->get_parameters().end(); ++param, ++arg ) {
1053	assert( arg != appExpr->get_args().end() );
1054	addCast( arg, (param)->get_type(), exprTyVars );
1055	boxParam( (param)->get_type(), arg, exprTyVars );
1056	} // for
1057	}
1058
1059	void Pass1::addInferredParams( ApplicationExpr appExpr, FunctionType functionType, std::list< Expression *>::iterator &arg, const TyVarMap &tyVars ) {
1060	std::list< Expression *>::iterator cur = arg;
1061	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
1062	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
1063	InferredParams::const_iterator inferParam = appExpr->get_inferParams().find( (*assert)->get_uniqueId() );
1064	assert( inferParam != appExpr->get_inferParams().end() && "NOTE: Explicit casts of polymorphic functions to compatible monomorphic functions are currently unsupported" );
1065	Expression *newExpr = inferParam->second.expr->clone();
1066	addCast( newExpr, (*assert)->get_type(), tyVars );
1067	boxParam( (*assert)->get_type(), newExpr, tyVars );
1068	appExpr->get_args().insert( cur, newExpr );
1069	} // for
1070	} // for
1071	}
1072
1073	void makeRetParm( FunctionType *funcType ) {
1074	DeclarationWithType *retParm = funcType->get_returnVals().front();
1075
1076	// make a new parameter that is a pointer to the type of the old return value
1077	retParm->set_type( new PointerType( Type::Qualifiers(), retParm->get_type() ) );
1078	funcType->get_parameters().push_front( retParm );
1079
1080	// we don't need the return value any more
1081	funcType->get_returnVals().clear();
1082	}
1083
1084	FunctionType makeAdapterType( FunctionType adaptee, const TyVarMap &tyVars ) {
1085	// actually make the adapter type
1086	FunctionType *adapter = adaptee->clone();
1087	if ( ! adapter->get_returnVals().empty() && isPolyType( adapter->get_returnVals().front()->get_type(), tyVars ) ) {
1088	makeRetParm( adapter );
1089	} // if
1090	adapter->get_parameters().push_front( new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) ), 0 ) );
1091	return adapter;
1092	}
1093
1094	Expression makeAdapterArg( DeclarationWithType param, DeclarationWithType arg, DeclarationWithType realParam, const TyVarMap &tyVars ) {
1095	assert( param );
1096	assert( arg );
1097	if ( isPolyType( realParam->get_type(), tyVars ) ) {
1098	if ( ! isPolyType( arg->get_type() ) ) {
1099	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
1100	deref->get_args().push_back( new CastExpr( new VariableExpr( param ), new PointerType( Type::Qualifiers(), arg->get_type()->clone() ) ) );
1101	deref->get_results().push_back( arg->get_type()->clone() );
1102	return deref;
1103	} // if
1104	} // if
1105	return new VariableExpr( param );
1106	}
1107
1108	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 ) {
1109	UniqueName paramNamer( "_p" );
1110	for ( ; param != paramEnd; ++param, ++arg, ++realParam ) {
1111	if ( (*param)->get_name() == "" ) {
1112	(*param)->set_name( paramNamer.newName() );
1113	(*param)->set_linkage( LinkageSpec::C );
1114	} // if
1115	adapteeApp->get_args().push_back( makeAdapterArg( param, arg, *realParam, tyVars ) );
1116	} // for
1117	}
1118
1119	FunctionDecl Pass1::makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars ) {
1120	FunctionType *adapterType = makeAdapterType( adaptee, tyVars );
1121	adapterType = ScrubTyVars::scrub( adapterType, tyVars );
1122	DeclarationWithType *adapteeDecl = adapterType->get_parameters().front();
1123	adapteeDecl->set_name( "_adaptee" );
1124	ApplicationExpr *adapteeApp = new ApplicationExpr( new CastExpr( new VariableExpr( adapteeDecl ), new PointerType( Type::Qualifiers(), realType ) ) );
1125	Statement *bodyStmt;
1126
1127	std::list< TypeDecl *>::iterator tyArg = realType->get_forall().begin();
1128	std::list< TypeDecl *>::iterator tyParam = adapterType->get_forall().begin();
1129	std::list< TypeDecl *>::iterator realTyParam = adaptee->get_forall().begin();
1130	for ( ; tyParam != adapterType->get_forall().end(); ++tyArg, ++tyParam, ++realTyParam ) {
1131	assert( tyArg != realType->get_forall().end() );
1132	std::list< DeclarationWithType >::iterator assertArg = (tyArg)->get_assertions().begin();
1133	std::list< DeclarationWithType >::iterator assertParam = (tyParam)->get_assertions().begin();
1134	std::list< DeclarationWithType >::iterator realAssertParam = (realTyParam)->get_assertions().begin();
1135	for ( ; assertParam != (*tyParam)->get_assertions().end(); ++assertArg, ++assertParam, ++realAssertParam ) {
1136	assert( assertArg != (*tyArg)->get_assertions().end() );
1137	adapteeApp->get_args().push_back( makeAdapterArg( assertParam, assertArg, *realAssertParam, tyVars ) );
1138	} // for
1139	} // for
1140
1141	std::list< DeclarationWithType *>::iterator arg = realType->get_parameters().begin();
1142	std::list< DeclarationWithType *>::iterator param = adapterType->get_parameters().begin();
1143	std::list< DeclarationWithType *>::iterator realParam = adaptee->get_parameters().begin();
1144	param++; // skip adaptee parameter in the adapter type
1145	if ( realType->get_returnVals().empty() ) {
1146	// void return
1147	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1148	bodyStmt = new ExprStmt( noLabels, adapteeApp );
1149	} else if ( isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
1150	// return type T
1151	if ( (*param)->get_name() == "" ) {
1152	(*param)->set_name( "_ret" );
1153	(*param)->set_linkage( LinkageSpec::C );
1154	} // if
1155	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
1156	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
1157	deref->get_args().push_back( new CastExpr( new VariableExpr( *param++ ), new PointerType( Type::Qualifiers(), realType->get_returnVals().front()->get_type()->clone() ) ) );
1158	assign->get_args().push_back( deref );
1159	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1160	assign->get_args().push_back( adapteeApp );
1161	bodyStmt = new ExprStmt( noLabels, assign );
1162	} else {
1163	// adapter for a function that returns a monomorphic value
1164	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1165	bodyStmt = new ReturnStmt( noLabels, adapteeApp );
1166	} // if
1167	CompoundStmt *adapterBody = new CompoundStmt( noLabels );
1168	adapterBody->get_kids().push_back( bodyStmt );
1169	std::string adapterName = makeAdapterName( mangleName );
1170	return new FunctionDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, adapterType, adapterBody, false, false );
1171	}
1172
1173	void Pass1::passAdapters( ApplicationExpr * appExpr, FunctionType * functionType, const TyVarMap & exprTyVars ) {
1174	// collect a list of function types passed as parameters or implicit parameters (assertions)
1175	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
1176	std::list< FunctionType *> functions;
1177	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
1178	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
1179	findFunction( (*assert)->get_type(), functions, exprTyVars, needsAdapter );
1180	} // for
1181	} // for
1182	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
1183	findFunction( (*arg)->get_type(), functions, exprTyVars, needsAdapter );
1184	} // for
1185
1186	// parameter function types for which an appropriate adapter has been generated. we cannot use the types
1187	// after applying substitutions, since two different parameter types may be unified to the same type
1188	std::set< std::string > adaptersDone;
1189
1190	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
1191	FunctionType originalFunction = (funType)->clone();
1192	FunctionType realFunction = (funType)->clone();
1193	std::string mangleName = SymTab::Mangler::mangle( realFunction );
1194
1195	// only attempt to create an adapter or pass one as a parameter if we haven't already done so for this
1196	// pre-substitution parameter function type.
1197	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
1198	adaptersDone.insert( adaptersDone.begin(), mangleName );
1199
1200	// apply substitution to type variables to figure out what the adapter's type should look like
1201	assert( env );
1202	env->apply( realFunction );
1203	mangleName = SymTab::Mangler::mangle( realFunction );
1204	mangleName += makePolyMonoSuffix( originalFunction, exprTyVars );
1205
1206	typedef ScopedMap< std::string, DeclarationWithType* >::iterator AdapterIter;
1207	AdapterIter adapter = adapters.find( mangleName );
1208	if ( adapter == adapters.end() ) {
1209	// adapter has not been created yet in the current scope, so define it
1210	FunctionDecl newAdapter = makeAdapter( funType, realFunction, mangleName, exprTyVars );
1211	std::pair< AdapterIter, bool > answer = adapters.insert( std::pair< std::string, DeclarationWithType *>( mangleName, newAdapter ) );
1212	adapter = answer.first;
1213	stmtsToAdd.push_back( new DeclStmt( noLabels, newAdapter ) );
1214	} // if
1215	assert( adapter != adapters.end() );
1216
1217	// add the appropriate adapter as a parameter
1218	appExpr->get_args().push_front( new VariableExpr( adapter->second ) );
1219	} // if
1220	} // for
1221	} // passAdapters
1222
1223	Expression makeIncrDecrExpr( ApplicationExpr appExpr, Type *polyType, bool isIncr ) {
1224	NameExpr *opExpr;
1225	if ( isIncr ) {
1226	opExpr = new NameExpr( "?+=?" );
1227	} else {
1228	opExpr = new NameExpr( "?-=?" );
1229	} // if
1230	UntypedExpr *addAssign = new UntypedExpr( opExpr );
1231	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
1232	addAssign->get_args().push_back( address->get_arg() );
1233	} else {
1234	addAssign->get_args().push_back( appExpr->get_args().front() );
1235	} // if
1236	addAssign->get_args().push_back( new NameExpr( sizeofName( mangleType( polyType ) ) ) );
1237	addAssign->get_results().front() = appExpr->get_results().front()->clone();
1238	if ( appExpr->get_env() ) {
1239	addAssign->set_env( appExpr->get_env() );
1240	appExpr->set_env( 0 );
1241	} // if
1242	appExpr->get_args().clear();
1243	delete appExpr;
1244	return addAssign;
1245	}
1246
1247	Expression Pass1::handleIntrinsics( ApplicationExpr appExpr ) {
1248	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( appExpr->get_function() ) ) {
1249	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic ) {
1250	if ( varExpr->get_var()->get_name() == "?[?]" ) {
1251	assert( ! appExpr->get_results().empty() );
1252	assert( appExpr->get_args().size() == 2 );
1253	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
1254	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
1255	assert( ! baseType1 \|\| ! baseType2 ); // the arguments cannot both be polymorphic pointers
1256	UntypedExpr *ret = 0;
1257	if ( baseType1 \|\| baseType2 ) { // one of the arguments is a polymorphic pointer
1258	ret = new UntypedExpr( new NameExpr( "?+?" ) );
1259	} // if
1260	if ( baseType1 ) {
1261	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1262	multiply->get_args().push_back( appExpr->get_args().back() );
1263	multiply->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1264	ret->get_args().push_back( appExpr->get_args().front() );
1265	ret->get_args().push_back( multiply );
1266	} else if ( baseType2 ) {
1267	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1268	multiply->get_args().push_back( appExpr->get_args().front() );
1269	multiply->get_args().push_back( new SizeofExpr( baseType2->clone() ) );
1270	ret->get_args().push_back( multiply );
1271	ret->get_args().push_back( appExpr->get_args().back() );
1272	} // if
1273	if ( baseType1 \|\| baseType2 ) {
1274	ret->get_results().push_front( appExpr->get_results().front()->clone() );
1275	if ( appExpr->get_env() ) {
1276	ret->set_env( appExpr->get_env() );
1277	appExpr->set_env( 0 );
1278	} // if
1279	appExpr->get_args().clear();
1280	delete appExpr;
1281	return ret;
1282	} // if
1283	} else if ( varExpr->get_var()->get_name() == "*?" ) {
1284	assert( ! appExpr->get_results().empty() );
1285	assert( ! appExpr->get_args().empty() );
1286	if ( isPolyType( appExpr->get_results().front(), scopeTyVars, env ) ) {
1287	Expression *ret = appExpr->get_args().front();
1288	delete ret->get_results().front();
1289	ret->get_results().front() = appExpr->get_results().front()->clone();
1290	if ( appExpr->get_env() ) {
1291	ret->set_env( appExpr->get_env() );
1292	appExpr->set_env( 0 );
1293	} // if
1294	appExpr->get_args().clear();
1295	delete appExpr;
1296	return ret;
1297	} // if
1298	} else if ( varExpr->get_var()->get_name() == "?++" \|\| varExpr->get_var()->get_name() == "?--" ) {
1299	assert( ! appExpr->get_results().empty() );
1300	assert( appExpr->get_args().size() == 1 );
1301	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
1302	Type *tempType = appExpr->get_results().front()->clone();
1303	if ( env ) {
1304	env->apply( tempType );
1305	} // if
1306	ObjectDecl *newObj = makeTemporary( tempType );
1307	VariableExpr *tempExpr = new VariableExpr( newObj );
1308	UntypedExpr *assignExpr = new UntypedExpr( new NameExpr( "?=?" ) );
1309	assignExpr->get_args().push_back( tempExpr->clone() );
1310	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
1311	assignExpr->get_args().push_back( address->get_arg()->clone() );
1312	} else {
1313	assignExpr->get_args().push_back( appExpr->get_args().front()->clone() );
1314	} // if
1315	CommaExpr *firstComma = new CommaExpr( assignExpr, makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "?++" ) );
1316	return new CommaExpr( firstComma, tempExpr );
1317	} // if
1318	} else if ( varExpr->get_var()->get_name() == "++?" \|\| varExpr->get_var()->get_name() == "--?" ) {
1319	assert( ! appExpr->get_results().empty() );
1320	assert( appExpr->get_args().size() == 1 );
1321	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
1322	return makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "++?" );
1323	} // if
1324	} else if ( varExpr->get_var()->get_name() == "?+?" \|\| varExpr->get_var()->get_name() == "?-?" ) {
1325	assert( ! appExpr->get_results().empty() );
1326	assert( appExpr->get_args().size() == 2 );
1327	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
1328	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
1329	if ( baseType1 && baseType2 ) {
1330	UntypedExpr *divide = new UntypedExpr( new NameExpr( "?/?" ) );
1331	divide->get_args().push_back( appExpr );
1332	divide->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1333	divide->get_results().push_front( appExpr->get_results().front()->clone() );
1334	if ( appExpr->get_env() ) {
1335	divide->set_env( appExpr->get_env() );
1336	appExpr->set_env( 0 );
1337	} // if
1338	return divide;
1339	} else if ( baseType1 ) {
1340	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1341	multiply->get_args().push_back( appExpr->get_args().back() );
1342	multiply->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1343	appExpr->get_args().back() = multiply;
1344	} else if ( baseType2 ) {
1345	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1346	multiply->get_args().push_back( appExpr->get_args().front() );
1347	multiply->get_args().push_back( new SizeofExpr( baseType2->clone() ) );
1348	appExpr->get_args().front() = multiply;
1349	} // if
1350	} else if ( varExpr->get_var()->get_name() == "?+=?" \|\| varExpr->get_var()->get_name() == "?-=?" ) {
1351	assert( ! appExpr->get_results().empty() );
1352	assert( appExpr->get_args().size() == 2 );
1353	Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env );
1354	if ( baseType ) {
1355	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1356	multiply->get_args().push_back( appExpr->get_args().back() );
1357	multiply->get_args().push_back( new SizeofExpr( baseType->clone() ) );
1358	appExpr->get_args().back() = multiply;
1359	} // if
1360	} // if
1361	return appExpr;
1362	} // if
1363	} // if
1364	return 0;
1365	}
1366
1367	Expression Pass1::mutate( ApplicationExpr appExpr ) {
1368	// std::cerr << "mutate appExpr: ";
1369	// for ( TyVarMap::iterator i = scopeTyVars.begin(); i != scopeTyVars.end(); ++i ) {
1370	// std::cerr << i->first << " ";
1371	// }
1372	// std::cerr << "\n";
1373	bool oldUseRetval = useRetval;
1374	useRetval = false;
1375	appExpr->get_function()->acceptMutator( *this );
1376	mutateAll( appExpr->get_args(), *this );
1377	useRetval = oldUseRetval;
1378
1379	assert( ! appExpr->get_function()->get_results().empty() );
1380	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
1381	assert( pointer );
1382	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
1383	assert( function );
1384
1385	if ( Expression *newExpr = handleIntrinsics( appExpr ) ) {
1386	return newExpr;
1387	} // if
1388
1389	Expression *ret = appExpr;
1390
1391	std::list< Expression *>::iterator arg = appExpr->get_args().begin();
1392	std::list< Expression *>::iterator paramBegin = appExpr->get_args().begin();
1393
1394	TyVarMap exprTyVars( (TypeDecl::Kind)-1 );
1395	makeTyVarMap( function, exprTyVars );
1396	ReferenceToType *polyRetType = isPolyRet( function );
1397
1398	if ( polyRetType ) {
1399	ret = addPolyRetParam( appExpr, function, polyRetType, arg );
1400	} else if ( needsAdapter( function, scopeTyVars ) ) {
1401	// std::cerr << "needs adapter: ";
1402	// printTyVarMap( std::cerr, scopeTyVars );
1403	// std::cerr << *env << std::endl;
1404	// change the application so it calls the adapter rather than the passed function
1405	ret = applyAdapter( appExpr, function, arg, scopeTyVars );
1406	} // if
1407	arg = appExpr->get_args().begin();
1408
1409	passTypeVars( appExpr, polyRetType, arg, exprTyVars );
1410	addInferredParams( appExpr, function, arg, exprTyVars );
1411
1412	arg = paramBegin;
1413
1414	boxParams( appExpr, function, arg, exprTyVars );
1415	passAdapters( appExpr, function, exprTyVars );
1416
1417	return ret;
1418	}
1419
1420	Expression Pass1::mutate( UntypedExpr expr ) {
1421	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
1422	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
1423	if ( name->get_name() == "*?" ) {
1424	Expression *ret = expr->get_args().front();
1425	expr->get_args().clear();
1426	delete expr;
1427	return ret->acceptMutator( *this );
1428	} // if
1429	} // if
1430	} // if
1431	return PolyMutator::mutate( expr );
1432	}
1433
1434	Expression Pass1::mutate( AddressExpr addrExpr ) {
1435	assert( ! addrExpr->get_arg()->get_results().empty() );
1436
1437	bool needs = false;
1438	if ( UntypedExpr expr = dynamic_cast< UntypedExpr >( addrExpr->get_arg() ) ) {
1439	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
1440	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
1441	if ( name->get_name() == "*?" ) {
1442	if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr->get_args().front() ) ) {
1443	assert( ! appExpr->get_function()->get_results().empty() );
1444	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
1445	assert( pointer );
1446	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
1447	assert( function );
1448	needs = needsAdapter( function, scopeTyVars );
1449	} // if
1450	} // if
1451	} // if
1452	} // if
1453	} // if
1454	// isPolyType check needs to happen before mutating addrExpr arg, so pull it forward
1455	// out of the if condition.
1456	bool polytype = isPolyType( addrExpr->get_arg()->get_results().front(), scopeTyVars, env );
1457	addrExpr->set_arg( mutateExpression( addrExpr->get_arg() ) );
1458	if ( polytype \|\| needs ) {
1459	Expression *ret = addrExpr->get_arg();
1460	delete ret->get_results().front();
1461	ret->get_results().front() = addrExpr->get_results().front()->clone();
1462	addrExpr->set_arg( 0 );
1463	delete addrExpr;
1464	return ret;
1465	} else {
1466	return addrExpr;
1467	} // if
1468	}
1469
1470	/// Wraps a function declaration in a new pointer-to-function variable expression
1471	VariableExpr wrapFunctionDecl( DeclarationWithType functionDecl ) {
1472	// line below cloned from FixFunction.cc
1473	ObjectDecl *functionObj = new ObjectDecl( functionDecl->get_name(), functionDecl->get_storageClass(), functionDecl->get_linkage(), 0,
1474	new PointerType( Type::Qualifiers(), functionDecl->get_type()->clone() ), 0 );
1475	functionObj->set_mangleName( functionDecl->get_mangleName() );
1476	return new VariableExpr( functionObj );
1477	}
1478
1479	/// Finds the operation declaration for a given type in one of the two maps
1480	DeclarationWithType* findOpForType( Type formalType, const ScopedMap< std::string, DeclarationWithType >& ops, ResolvExpr::TypeMap< DeclarationWithType >& scopedOps ) {
1481	if ( TypeInstType formalTypeInstType = dynamic_cast< TypeInstType >( formalType ) ) {
1482	ScopedMap< std::string, DeclarationWithType *>::const_iterator opIt = ops.find( formalTypeInstType->get_name() );
1483	return opIt == ops.end() ? 0 : opIt->second;
1484	} else {
1485	return scopedOps.find( formalType );
1486	}
1487	}
1488
1489	/// Adds an assertion parameter to the application expression for the actual assertion declaration valued with the assert op
1490	void addAssertionFor( ApplicationExpr appExpr, DeclarationWithType actualDecl, DeclarationWithType *assertOp ) {
1491	appExpr->get_inferParams()[ actualDecl->get_uniqueId() ]
1492	= ParamEntry( assertOp->get_uniqueId(), assertOp->get_type()->clone(), actualDecl->get_type()->clone(), wrapFunctionDecl( assertOp ) );
1493	}
1494
1495	Statement * Pass1::mutate( ReturnStmt *returnStmt ) {
1496	if ( retval && returnStmt->get_expr() ) {
1497	assert( ! returnStmt->get_expr()->get_results().empty() );
1498	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
1499	// if ( returnStmt->get_expr()->get_results().front()->get_isLvalue() ) {
1500	// by this point, a cast expr on a polymorphic return value is redundant
1501	while ( CastExpr castExpr = dynamic_cast< CastExpr >( returnStmt->get_expr() ) ) {
1502	returnStmt->set_expr( castExpr->get_arg() );
1503	returnStmt->get_expr()->set_env( castExpr->get_env() );
1504	castExpr->set_env( 0 );
1505	castExpr->set_arg( 0 );
1506	delete castExpr;
1507	} //while
1508
1509	// find assignment operator for (polymorphic) return type
1510	ApplicationExpr *assignExpr = 0;
1511	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( retval->get_type() ) ) {
1512	// find assignment operator for type variable
1513	ScopedMap< std::string, DeclarationWithType *>::const_iterator assignIter = assignOps.find( typeInst->get_name() );
1514	if ( assignIter == assignOps.end() ) {
1515	throw SemanticError( "Attempt to return dtype or ftype object in ", returnStmt->get_expr() );
1516	} // if
1517	assignExpr = new ApplicationExpr( new VariableExpr( assignIter->second ) );
1518	} else if ( ReferenceToType refType = dynamic_cast< ReferenceToType >( retval->get_type() ) ) {
1519	// find assignment operator for generic type
1520	DeclarationWithType *functionDecl = scopedAssignOps.find( refType );
1521	if ( ! functionDecl ) {
1522	throw SemanticError( "Attempt to return dtype or ftype generic object in ", returnStmt->get_expr() );
1523	}
1524
1525	// wrap it up in an application expression
1526	assignExpr = new ApplicationExpr( wrapFunctionDecl( functionDecl ) );
1527	assignExpr->set_env( env->clone() );
1528
1529	// find each of its needed secondary assignment operators
1530	std::list< Expression* > &tyParams = refType->get_parameters();
1531	std::list< TypeDecl* > &forallParams = functionDecl->get_type()->get_forall();
1532	std::list< Expression* >::const_iterator tyIt = tyParams.begin();
1533	std::list< TypeDecl* >::const_iterator forallIt = forallParams.begin();
1534	for ( ; tyIt != tyParams.end() && forallIt != forallParams.end(); ++tyIt, ++forallIt ) {
1535	// Add appropriate mapping to assignment expression environment
1536	TypeExpr formalTypeExpr = dynamic_cast< TypeExpr >( *tyIt );
1537	assert( formalTypeExpr && "type parameters must be type expressions" );
1538	Type *formalType = formalTypeExpr->get_type();
1539	assignExpr->get_env()->add( (*forallIt)->get_name(), formalType );
1540
1541	// skip non-otype parameters (ftype/dtype)
1542	if ( (*forallIt)->get_kind() != TypeDecl::Any ) continue;
1543
1544	// find otype operators for formal type
1545	DeclarationWithType *assertAssign = findOpForType( formalType, assignOps, scopedAssignOps );
1546	if ( ! assertAssign ) throw SemanticError( "No assignment operation found for ", formalType );
1547
1548	DeclarationWithType *assertCtor = findOpForType( formalType, ctorOps, scopedCtorOps );
1549	if ( ! assertCtor ) throw SemanticError( "No default constructor found for ", formalType );
1550
1551	DeclarationWithType *assertCopy = findOpForType( formalType, copyOps, scopedCopyOps );
1552	if ( ! assertCopy ) throw SemanticError( "No copy constructor found for ", formalType );
1553
1554	DeclarationWithType *assertDtor = findOpForType( formalType, dtorOps, scopedDtorOps );
1555	if ( ! assertDtor ) throw SemanticError( "No destructor found for ", formalType );
1556
1557	// add inferred parameters for otype operators to assignment expression
1558	// NOTE: Code here assumes that first four assertions are assign op, ctor, copy ctor, dtor, in that order
1559	std::list< DeclarationWithType* > &asserts = (*forallIt)->get_assertions();
1560	assert( asserts.size() >= 4 && "Type param needs otype operator assertions" );
1561
1562	std::list< DeclarationWithType* >::iterator actualIt = asserts.begin();
1563	addAssertionFor( assignExpr, *actualIt, assertAssign );
1564	++actualIt;
1565	addAssertionFor( assignExpr, *actualIt, assertCtor );
1566	++actualIt;
1567	addAssertionFor( assignExpr, *actualIt, assertCopy );
1568	++actualIt;
1569	addAssertionFor( assignExpr, *actualIt, assertDtor );
1570
1571	//DeclarationWithType *actualDecl = asserts.front();
1572	//assignExpr->get_inferParams()[ actualDecl->get_uniqueId() ]
1573	// = ParamEntry( assertAssign->get_uniqueId(), assertAssign->get_type()->clone(), actualDecl->get_type()->clone(), wrapFunctionDecl( assertAssign ) );
1574	}
1575	}
1576	assert( assignExpr );
1577
1578	// replace return statement with appropriate assignment to out parameter
1579	Expression *retParm = new NameExpr( retval->get_name() );
1580	retParm->get_results().push_back( new PointerType( Type::Qualifiers(), retval->get_type()->clone() ) );
1581	assignExpr->get_args().push_back( retParm );
1582	assignExpr->get_args().push_back( returnStmt->get_expr() );
1583	stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( assignExpr ) ) );
1584	// } else {
1585	// useRetval = true;
1586	// stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( returnStmt->get_expr() ) ) );
1587	// useRetval = false;
1588	// } // if
1589	returnStmt->set_expr( 0 );
1590	} else {
1591	returnStmt->set_expr( mutateExpression( returnStmt->get_expr() ) );
1592	} // if
1593	return returnStmt;
1594	}
1595
1596	Type * Pass1::mutate( PointerType *pointerType ) {
1597	scopeTyVars.beginScope();
1598	makeTyVarMap( pointerType, scopeTyVars );
1599
1600	Type *ret = Mutator::mutate( pointerType );
1601
1602	scopeTyVars.endScope();
1603	return ret;
1604	}
1605
1606	Type * Pass1::mutate( FunctionType *functionType ) {
1607	scopeTyVars.beginScope();
1608	makeTyVarMap( functionType, scopeTyVars );
1609
1610	Type *ret = Mutator::mutate( functionType );
1611
1612	scopeTyVars.endScope();
1613	return ret;
1614	}
1615
1616	void Pass1::doBeginScope() {
1617	adapters.beginScope();
1618	scopedAssignOps.beginScope();
1619	scopedCtorOps.beginScope();
1620	scopedCopyOps.beginScope();
1621	scopedDtorOps.beginScope();
1622	}
1623
1624	void Pass1::doEndScope() {
1625	adapters.endScope();
1626	scopedAssignOps.endScope();
1627	scopedCtorOps.endScope();
1628	scopedCopyOps.endScope();
1629	scopedDtorOps.endScope();
1630	}
1631
1632	////////////////////////////////////////// Pass2 ////////////////////////////////////////////////////
1633
1634	void Pass2::addAdapters( FunctionType *functionType ) {
1635	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
1636	std::list< FunctionType *> functions;
1637	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
1638	Type orig = (arg)->get_type();
1639	findAndReplaceFunction( orig, functions, scopeTyVars, needsAdapter );
1640	(*arg)->set_type( orig );
1641	}
1642	std::set< std::string > adaptersDone;
1643	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
1644	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
1645	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
1646	std::string adapterName = makeAdapterName( mangleName );
1647	paramList.push_front( new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( *funType, scopeTyVars ) ), 0 ) );
1648	adaptersDone.insert( adaptersDone.begin(), mangleName );
1649	}
1650	}
1651	// deleteAll( functions );
1652	}
1653
1654	template< typename DeclClass >
1655	DeclClass * Pass2::handleDecl( DeclClass decl, Type type ) {
1656	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
1657
1658	return ret;
1659	}
1660
1661	DeclarationWithType * Pass2::mutate( FunctionDecl *functionDecl ) {
1662	return handleDecl( functionDecl, functionDecl->get_functionType() );
1663	}
1664
1665	ObjectDecl * Pass2::mutate( ObjectDecl *objectDecl ) {
1666	return handleDecl( objectDecl, objectDecl->get_type() );
1667	}
1668
1669	TypeDecl * Pass2::mutate( TypeDecl *typeDecl ) {
1670	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1671	if ( typeDecl->get_base() ) {
1672	return handleDecl( typeDecl, typeDecl->get_base() );
1673	} else {
1674	return Mutator::mutate( typeDecl );
1675	}
1676	}
1677
1678	TypedefDecl * Pass2::mutate( TypedefDecl *typedefDecl ) {
1679	return handleDecl( typedefDecl, typedefDecl->get_base() );
1680	}
1681
1682	Type * Pass2::mutate( PointerType *pointerType ) {
1683	scopeTyVars.beginScope();
1684	makeTyVarMap( pointerType, scopeTyVars );
1685
1686	Type *ret = Mutator::mutate( pointerType );
1687
1688	scopeTyVars.endScope();
1689	return ret;
1690	}
1691
1692	Type Pass2::mutate( FunctionType funcType ) {
1693	scopeTyVars.beginScope();
1694	makeTyVarMap( funcType, scopeTyVars );
1695
1696	// move polymorphic return type to parameter list
1697	if ( isPolyRet( funcType ) ) {
1698	DeclarationWithType *ret = funcType->get_returnVals().front();
1699	ret->set_type( new PointerType( Type::Qualifiers(), ret->get_type() ) );
1700	funcType->get_parameters().push_front( ret );
1701	funcType->get_returnVals().pop_front();
1702	}
1703
1704	// add size/align and assertions for type parameters to parameter list
1705	std::list< DeclarationWithType *>::iterator last = funcType->get_parameters().begin();
1706	std::list< DeclarationWithType *> inferredParams;
1707	ObjectDecl newObj( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), 0 );
1708	ObjectDecl newPtr( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0,
1709	new PointerType( Type::Qualifiers(), new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) ), 0 );
1710	for ( std::list< TypeDecl *>::const_iterator tyParm = funcType->get_forall().begin(); tyParm != funcType->get_forall().end(); ++tyParm ) {
1711	ObjectDecl sizeParm, alignParm;
1712	// add all size and alignment parameters to parameter list
1713	if ( (*tyParm)->get_kind() == TypeDecl::Any ) {
1714	TypeInstType parmType( Type::Qualifiers(), (tyParm)->get_name(), tyParm );
1715	std::string parmName = mangleType( &parmType );
1716
1717	sizeParm = newObj.clone();
1718	sizeParm->set_name( sizeofName( parmName ) );
1719	last = funcType->get_parameters().insert( last, sizeParm );
1720	++last;
1721
1722	alignParm = newObj.clone();
1723	alignParm->set_name( alignofName( parmName ) );
1724	last = funcType->get_parameters().insert( last, alignParm );
1725	++last;
1726	}
1727	// move all assertions into parameter list
1728	for ( std::list< DeclarationWithType >::iterator assert = (tyParm)->get_assertions().begin(); assert != (*tyParm)->get_assertions().end(); ++assert ) {
1729	// assert = (assert)->acceptMutator( *this );
1730	inferredParams.push_back( *assert );
1731	}
1732	(*tyParm)->get_assertions().clear();
1733	}
1734
1735	// add size/align for generic parameter types to parameter list
1736	std::set< std::string > seenTypes; // sizeofName for generic types we've seen
1737	for ( std::list< DeclarationWithType* >::const_iterator fnParm = last; fnParm != funcType->get_parameters().end(); ++fnParm ) {
1738	Type polyType = isPolyType( (fnParm)->get_type(), scopeTyVars );
1739	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
1740	std::string typeName = mangleType( polyType );
1741	if ( seenTypes.count( typeName ) ) continue;
1742
1743	ObjectDecl sizeParm, alignParm, *offsetParm;
1744	sizeParm = newObj.clone();
1745	sizeParm->set_name( sizeofName( typeName ) );
1746	last = funcType->get_parameters().insert( last, sizeParm );
1747	++last;
1748
1749	alignParm = newObj.clone();
1750	alignParm->set_name( alignofName( typeName ) );
1751	last = funcType->get_parameters().insert( last, alignParm );
1752	++last;
1753
1754	if ( StructInstType polyBaseStruct = dynamic_cast< StructInstType >( polyType ) ) {
1755	// NOTE zero-length arrays are illegal in C, so empty structs have no offset array
1756	if ( ! polyBaseStruct->get_baseStruct()->get_members().empty() ) {
1757	offsetParm = newPtr.clone();
1758	offsetParm->set_name( offsetofName( typeName ) );
1759	last = funcType->get_parameters().insert( last, offsetParm );
1760	++last;
1761	}
1762	}
1763
1764	seenTypes.insert( typeName );
1765	}
1766	}
1767
1768	// splice assertion parameters into parameter list
1769	funcType->get_parameters().splice( last, inferredParams );
1770	addAdapters( funcType );
1771	mutateAll( funcType->get_returnVals(), *this );
1772	mutateAll( funcType->get_parameters(), *this );
1773
1774	scopeTyVars.endScope();
1775	return funcType;
1776	}
1777
1778	//////////////////////////////////////// GenericInstantiator //////////////////////////////////////////////////
1779
1780	/// Makes substitutions of params into baseParams; returns true if all parameters substituted for a concrete type
1781	bool makeSubstitutions( const std::list< TypeDecl* >& baseParams, const std::list< Expression* >& params, std::list< TypeExpr* >& out ) {
1782	bool allConcrete = true; // will finish the substitution list even if they're not all concrete
1783
1784	// substitute concrete types for given parameters, and incomplete types for placeholders
1785	std::list< TypeDecl* >::const_iterator baseParam = baseParams.begin();
1786	std::list< Expression* >::const_iterator param = params.begin();
1787	for ( ; baseParam != baseParams.end() && param != params.end(); ++baseParam, ++param ) {
1788	// switch ( (*baseParam)->get_kind() ) {
1789	// case TypeDecl::Any: { // any type is a valid substitution here; complete types can be used to instantiate generics
1790	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
1791	assert(paramType && "Aggregate parameters should be type expressions");
1792	out.push_back( paramType->clone() );
1793	// check that the substituted type isn't a type variable itself
1794	if ( dynamic_cast< TypeInstType* >( paramType->get_type() ) ) {
1795	allConcrete = false;
1796	}
1797	// break;
1798	// }
1799	// case TypeDecl::Dtype: // dtype can be consistently replaced with void [only pointers, which become void*]
1800	// out.push_back( new TypeExpr( new VoidType( Type::Qualifiers() ) ) );
1801	// break;
1802	// case TypeDecl::Ftype: // pointer-to-ftype can be consistently replaced with void (*)(void) [similar to dtype]
1803	// out.push_back( new TypeExpr( new FunctionType( Type::Qualifiers(), false ) ) );
1804	// break;
1805	// }
1806	}
1807
1808	// if any parameters left over, not done
1809	if ( baseParam != baseParams.end() ) return false;
1810	// // if not enough parameters given, substitute remaining incomplete types for placeholders
1811	// for ( ; baseParam != baseParams.end(); ++baseParam ) {
1812	// switch ( (*baseParam)->get_kind() ) {
1813	// case TypeDecl::Any: // no more substitutions here, fail early
1814	// return false;
1815	// case TypeDecl::Dtype: // dtype can be consistently replaced with void [only pointers, which become void*]
1816	// out.push_back( new TypeExpr( new VoidType( Type::Qualifiers() ) ) );
1817	// break;
1818	// case TypeDecl::Ftype: // pointer-to-ftype can be consistently replaced with void (*)(void) [similar to dtype]
1819	// out.push_back( new TypeExpr( new FunctionType( Type::Qualifiers(), false ) ) );
1820	// break;
1821	// }
1822	// }
1823
1824	return allConcrete;
1825	}
1826
1827	/// Substitutes types of members of in according to baseParams => typeSubs, appending the result to out
1828	void substituteMembers( const std::list< Declaration* >& in, const std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs,
1829	std::list< Declaration* >& out ) {
1830	// substitute types into new members
1831	TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
1832	for ( std::list< Declaration* >::const_iterator member = in.begin(); member != in.end(); ++member ) {
1833	Declaration newMember = (member)->clone();
1834	subs.apply(newMember);
1835	out.push_back( newMember );
1836	}
1837	}
1838
1839	Type* GenericInstantiator::mutate( StructInstType *inst ) {
1840	// mutate subtypes
1841	Type *mutated = Mutator::mutate( inst );
1842	inst = dynamic_cast< StructInstType* >( mutated );
1843	if ( ! inst ) return mutated;
1844
1845	// exit early if no need for further mutation
1846	if ( inst->get_parameters().empty() ) return inst;
1847	assert( inst->get_baseParameters() && "Base struct has parameters" );
1848
1849	// check if type can be concretely instantiated; put substitutions into typeSubs
1850	std::list< TypeExpr* > typeSubs;
1851	if ( ! makeSubstitutions( *inst->get_baseParameters(), inst->get_parameters(), typeSubs ) ) {
1852	deleteAll( typeSubs );
1853	return inst;
1854	}
1855
1856	// make concrete instantiation of generic type
1857	StructDecl *concDecl = lookup( inst, typeSubs );
1858	if ( ! concDecl ) {
1859	// set concDecl to new type, insert type declaration into statements to add
1860	concDecl = new StructDecl( typeNamer.newName( inst->get_name() ) );
1861	substituteMembers( inst->get_baseStruct()->get_members(), *inst->get_baseParameters(), typeSubs, concDecl->get_members() );
1862	DeclMutator::addDeclaration( concDecl );
1863	insert( inst, typeSubs, concDecl );
1864	}
1865	StructInstType *newInst = new StructInstType( inst->get_qualifiers(), concDecl->get_name() );
1866	newInst->set_baseStruct( concDecl );
1867
1868	deleteAll( typeSubs );
1869	delete inst;
1870	return newInst;
1871	}
1872
1873	Type* GenericInstantiator::mutate( UnionInstType *inst ) {
1874	// mutate subtypes
1875	Type *mutated = Mutator::mutate( inst );
1876	inst = dynamic_cast< UnionInstType* >( mutated );
1877	if ( ! inst ) return mutated;
1878
1879	// exit early if no need for further mutation
1880	if ( inst->get_parameters().empty() ) return inst;
1881	assert( inst->get_baseParameters() && "Base union has parameters" );
1882
1883	// check if type can be concretely instantiated; put substitutions into typeSubs
1884	std::list< TypeExpr* > typeSubs;
1885	if ( ! makeSubstitutions( *inst->get_baseParameters(), inst->get_parameters(), typeSubs ) ) {
1886	deleteAll( typeSubs );
1887	return inst;
1888	}
1889
1890	// make concrete instantiation of generic type
1891	UnionDecl *concDecl = lookup( inst, typeSubs );
1892	if ( ! concDecl ) {
1893	// set concDecl to new type, insert type declaration into statements to add
1894	concDecl = new UnionDecl( typeNamer.newName( inst->get_name() ) );
1895	substituteMembers( inst->get_baseUnion()->get_members(), *inst->get_baseParameters(), typeSubs, concDecl->get_members() );
1896	DeclMutator::addDeclaration( concDecl );
1897	insert( inst, typeSubs, concDecl );
1898	}
1899	UnionInstType *newInst = new UnionInstType( inst->get_qualifiers(), concDecl->get_name() );
1900	newInst->set_baseUnion( concDecl );
1901
1902	deleteAll( typeSubs );
1903	delete inst;
1904	return newInst;
1905	}
1906
1907	// /// Gets the base struct or union declaration for a member expression; NULL if not applicable
1908	// AggregateDecl* getMemberBaseDecl( MemberExpr *memberExpr ) {
1909	// // get variable for member aggregate
1910	// VariableExpr varExpr = dynamic_cast< VariableExpr >( memberExpr->get_aggregate() );
1911	// if ( ! varExpr ) return NULL;
1912	//
1913	// // get object for variable
1914	// ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( varExpr->get_var() );
1915	// if ( ! objectDecl ) return NULL;
1916	//
1917	// // get base declaration from object type
1918	// Type *objectType = objectDecl->get_type();
1919	// StructInstType structType = dynamic_cast< StructInstType >( objectType );
1920	// if ( structType ) return structType->get_baseStruct();
1921	// UnionInstType unionType = dynamic_cast< UnionInstType >( objectType );
1922	// if ( unionType ) return unionType->get_baseUnion();
1923	//
1924	// return NULL;
1925	// }
1926	//
1927	// /// Finds the declaration with the given name, returning decls.end() if none such
1928	// std::list< Declaration* >::const_iterator findDeclNamed( const std::list< Declaration* > &decls, const std::string &name ) {
1929	// for( std::list< Declaration* >::const_iterator decl = decls.begin(); decl != decls.end(); ++decl ) {
1930	// if ( (*decl)->get_name() == name ) return decl;
1931	// }
1932	// return decls.end();
1933	// }
1934	//
1935	// Expression* Instantiate::mutate( MemberExpr *memberExpr ) {
1936	// // mutate, exiting early if no longer MemberExpr
1937	// Expression *expr = Mutator::mutate( memberExpr );
1938	// memberExpr = dynamic_cast< MemberExpr* >( expr );
1939	// if ( ! memberExpr ) return expr;
1940	//
1941	// // get declaration of member and base declaration of member, exiting early if not found
1942	// AggregateDecl *memberBase = getMemberBaseDecl( memberExpr );
1943	// if ( ! memberBase ) return memberExpr;
1944	// DeclarationWithType *memberDecl = memberExpr->get_member();
1945	// std::list< Declaration* >::const_iterator baseIt = findDeclNamed( memberBase->get_members(), memberDecl->get_name() );
1946	// if ( baseIt == memberBase->get_members().end() ) return memberExpr;
1947	// DeclarationWithType baseDecl = dynamic_cast< DeclarationWithType >( *baseIt );
1948	// if ( ! baseDecl ) return memberExpr;
1949	//
1950	// // check if stated type of the member is not the type of the member's declaration; if so, need a cast
1951	// // this SHOULD be safe, I don't think anything but the void-replacements I put in for dtypes would make it past the typechecker
1952	// SymTab::Indexer dummy;
1953	// if ( ResolvExpr::typesCompatible( memberDecl->get_type(), baseDecl->get_type(), dummy ) ) return memberExpr;
1954	// else return new CastExpr( memberExpr, memberDecl->get_type() );
1955	// }
1956
1957	void GenericInstantiator::doBeginScope() {
1958	DeclMutator::doBeginScope();
1959	instantiations.beginScope();
1960	}
1961
1962	void GenericInstantiator::doEndScope() {
1963	DeclMutator::doEndScope();
1964	instantiations.endScope();
1965	}
1966
1967	////////////////////////////////////////// PolyGenericCalculator ////////////////////////////////////////////////////
1968
1969	void PolyGenericCalculator::beginTypeScope( Type *ty ) {
1970	scopeTyVars.beginScope();
1971	makeTyVarMap( ty, scopeTyVars );
1972	}
1973
1974	void PolyGenericCalculator::endTypeScope() {
1975	scopeTyVars.endScope();
1976	}
1977
1978	template< typename DeclClass >
1979	DeclClass * PolyGenericCalculator::handleDecl( DeclClass decl, Type type ) {
1980	beginTypeScope( type );
1981	knownLayouts.beginScope();
1982	knownOffsets.beginScope();
1983
1984	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
1985
1986	knownOffsets.endScope();
1987	knownLayouts.endScope();
1988	endTypeScope();
1989	return ret;
1990	}
1991
1992	ObjectDecl * PolyGenericCalculator::mutate( ObjectDecl *objectDecl ) {
1993	return handleDecl( objectDecl, objectDecl->get_type() );
1994	}
1995
1996	DeclarationWithType * PolyGenericCalculator::mutate( FunctionDecl *functionDecl ) {
1997	return handleDecl( functionDecl, functionDecl->get_functionType() );
1998	}
1999
2000	TypedefDecl * PolyGenericCalculator::mutate( TypedefDecl *typedefDecl ) {
2001	return handleDecl( typedefDecl, typedefDecl->get_base() );
2002	}
2003
2004	TypeDecl * PolyGenericCalculator::mutate( TypeDecl *typeDecl ) {
2005	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
2006	return Mutator::mutate( typeDecl );
2007	}
2008
2009	Type * PolyGenericCalculator::mutate( PointerType *pointerType ) {
2010	beginTypeScope( pointerType );
2011
2012	Type *ret = Mutator::mutate( pointerType );
2013
2014	endTypeScope();
2015	return ret;
2016	}
2017
2018	Type * PolyGenericCalculator::mutate( FunctionType *funcType ) {
2019	beginTypeScope( funcType );
2020
2021	// make sure that any type information passed into the function is accounted for
2022	for ( std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin(); fnParm != funcType->get_parameters().end(); ++fnParm ) {
2023	// condition here duplicates that in Pass2::mutate( FunctionType* )
2024	Type polyType = isPolyType( (fnParm)->get_type(), scopeTyVars );
2025	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
2026	knownLayouts.insert( mangleType( polyType ) );
2027	}
2028	}
2029
2030	Type *ret = Mutator::mutate( funcType );
2031
2032	endTypeScope();
2033	return ret;
2034	}
2035
2036	Statement PolyGenericCalculator::mutate( DeclStmt declStmt ) {
2037	if ( ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( declStmt->get_decl() ) ) {
2038	if ( findGeneric( objectDecl->get_type() ) ) {
2039	// change initialization of a polymorphic value object
2040	// to allocate storage with alloca
2041	Type *declType = objectDecl->get_type();
2042	UntypedExpr *alloc = new UntypedExpr( new NameExpr( "__builtin_alloca" ) );
2043	alloc->get_args().push_back( new NameExpr( sizeofName( mangleType( declType ) ) ) );
2044
2045	delete objectDecl->get_init();
2046
2047	std::list<Expression*> designators;
2048	objectDecl->set_init( new SingleInit( alloc, designators, false ) ); // not constructed
2049	}
2050	}
2051	return Mutator::mutate( declStmt );
2052	}
2053
2054	/// Finds the member in the base list that matches the given declaration; returns its index, or -1 if not present
2055	long findMember( DeclarationWithType memberDecl, std::list< Declaration > &baseDecls ) {
2056	long i = 0;
2057	for(std::list< Declaration* >::const_iterator decl = baseDecls.begin(); decl != baseDecls.end(); ++decl, ++i ) {
2058	if ( memberDecl->get_name() != (*decl)->get_name() ) continue;
2059
2060	if ( DeclarationWithType declWithType = dynamic_cast< DeclarationWithType >( *decl ) ) {
2061	if ( memberDecl->get_mangleName().empty() \|\| declWithType->get_mangleName().empty()
2062	\|\| memberDecl->get_mangleName() == declWithType->get_mangleName() ) return i;
2063	else continue;
2064	} else return i;
2065	}
2066	return -1;
2067	}
2068
2069	/// Returns an index expression into the offset array for a type
2070	Expression makeOffsetIndex( Type objectType, long i ) {
2071	std::stringstream offset_namer;
2072	offset_namer << i;
2073	ConstantExpr *fieldIndex = new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), offset_namer.str() ) );
2074	UntypedExpr *fieldOffset = new UntypedExpr( new NameExpr( "?[?]" ) );
2075	fieldOffset->get_args().push_back( new NameExpr( offsetofName( mangleType( objectType ) ) ) );
2076	fieldOffset->get_args().push_back( fieldIndex );
2077	return fieldOffset;
2078	}
2079
2080	/// Returns an expression dereferenced n times
2081	Expression makeDerefdVar( Expression derefdVar, long n ) {
2082	for ( int i = 1; i < n; ++i ) {
2083	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
2084	derefExpr->get_args().push_back( derefdVar );
2085	// xxx - should set results on derefExpr
2086	derefdVar = derefExpr;
2087	}
2088	return derefdVar;
2089	}
2090
2091	Expression PolyGenericCalculator::mutate( MemberExpr memberExpr ) {
2092	// mutate, exiting early if no longer MemberExpr
2093	Expression *expr = Mutator::mutate( memberExpr );
2094	memberExpr = dynamic_cast< MemberExpr* >( expr );
2095	if ( ! memberExpr ) return expr;
2096
2097	// get declaration for base struct, exiting early if not found
2098	int varDepth;
2099	VariableExpr *varExpr = getBaseVar( memberExpr->get_aggregate(), &varDepth );
2100	if ( ! varExpr ) return memberExpr;
2101	ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( varExpr->get_var() );
2102	if ( ! objectDecl ) return memberExpr;
2103
2104	// only mutate member expressions for polymorphic types
2105	int tyDepth;
2106	Type *objectType = hasPolyBase( objectDecl->get_type(), scopeTyVars, &tyDepth );
2107	if ( ! objectType ) return memberExpr;
2108	findGeneric( objectType ); // ensure layout for this type is available
2109
2110	Expression *newMemberExpr = 0;
2111	if ( StructInstType structType = dynamic_cast< StructInstType >( objectType ) ) {
2112	// look up offset index
2113	long i = findMember( memberExpr->get_member(), structType->get_baseStruct()->get_members() );
2114	if ( i == -1 ) return memberExpr;
2115
2116	// replace member expression with pointer to base plus offset
2117	UntypedExpr *fieldLoc = new UntypedExpr( new NameExpr( "?+?" ) );
2118	fieldLoc->get_args().push_back( makeDerefdVar( varExpr->clone(), varDepth ) );
2119	fieldLoc->get_args().push_back( makeOffsetIndex( objectType, i ) );
2120	newMemberExpr = fieldLoc;
2121	} else if ( dynamic_cast< UnionInstType* >( objectType ) ) {
2122	// union members are all at offset zero, so build appropriately-dereferenced variable
2123	newMemberExpr = makeDerefdVar( varExpr->clone(), varDepth );
2124	} else return memberExpr;
2125	assert( newMemberExpr );
2126
2127	Type *memberType = memberExpr->get_member()->get_type();
2128	if ( ! isPolyType( memberType, scopeTyVars ) ) {
2129	// 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
2130	CastExpr *ptrCastExpr = new CastExpr( newMemberExpr, new PointerType( Type::Qualifiers(), memberType->clone() ) );
2131	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
2132	derefExpr->get_args().push_back( ptrCastExpr );
2133	newMemberExpr = derefExpr;
2134	}
2135
2136	delete memberExpr;
2137	return newMemberExpr;
2138	}
2139
2140	ObjectDecl PolyGenericCalculator::makeVar( const std::string &name, Type type, Initializer *init ) {
2141	ObjectDecl *newObj = new ObjectDecl( name, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, init );
2142	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
2143	return newObj;
2144	}
2145
2146	void PolyGenericCalculator::addOtypeParamsToLayoutCall( UntypedExpr layoutCall, const std::list< Type > &otypeParams ) {
2147	for ( std::list< Type* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
2148	if ( findGeneric( *param ) ) {
2149	// push size/align vars for a generic parameter back
2150	std::string paramName = mangleType( *param );
2151	layoutCall->get_args().push_back( new NameExpr( sizeofName( paramName ) ) );
2152	layoutCall->get_args().push_back( new NameExpr( alignofName( paramName ) ) );
2153	} else {
2154	layoutCall->get_args().push_back( new SizeofExpr( (*param)->clone() ) );
2155	layoutCall->get_args().push_back( new AlignofExpr( (*param)->clone() ) );
2156	}
2157	}
2158	}
2159
2160	/// returns true if any of the otype parameters have a dynamic layout and puts all otype parameters in the output list
2161	bool findGenericParams( std::list< TypeDecl* > &baseParams, std::list< Expression* > &typeParams, std::list< Type* > &out ) {
2162	bool hasDynamicLayout = false;
2163
2164	std::list< TypeDecl* >::const_iterator baseParam = baseParams.begin();
2165	std::list< Expression* >::const_iterator typeParam = typeParams.begin();
2166	for ( ; baseParam != baseParams.end() && typeParam != typeParams.end(); ++baseParam, ++typeParam ) {
2167	// skip non-otype parameters
2168	if ( (*baseParam)->get_kind() != TypeDecl::Any ) continue;
2169	TypeExpr typeExpr = dynamic_cast< TypeExpr >( *typeParam );
2170	assert( typeExpr && "all otype parameters should be type expressions" );
2171
2172	Type *type = typeExpr->get_type();
2173	out.push_back( type );
2174	if ( isPolyType( type ) ) hasDynamicLayout = true;
2175	}
2176	assert( baseParam == baseParams.end() && typeParam == typeParams.end() );
2177
2178	return hasDynamicLayout;
2179	}
2180
2181	bool PolyGenericCalculator::findGeneric( Type *ty ) {
2182	ty = replaceTypeInst( ty, env );
2183
2184	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( ty ) ) {
2185	if ( scopeTyVars.find( typeInst->get_name() ) != scopeTyVars.end() ) {
2186	// NOTE assumes here that getting put in the scopeTyVars included having the layout variables set
2187	return true;
2188	}
2189	return false;
2190	} else if ( StructInstType structTy = dynamic_cast< StructInstType >( ty ) ) {
2191	// check if this type already has a layout generated for it
2192	std::string typeName = mangleType( ty );
2193	if ( knownLayouts.find( typeName ) != knownLayouts.end() ) return true;
2194
2195	// check if any of the type parameters have dynamic layout; if none do, this type is (or will be) monomorphized
2196	std::list< Type* > otypeParams;
2197	if ( ! findGenericParams( *structTy->get_baseParameters(), structTy->get_parameters(), otypeParams ) ) return false;
2198
2199	// insert local variables for layout and generate call to layout function
2200	knownLayouts.insert( typeName ); // done early so as not to interfere with the later addition of parameters to the layout call
2201	Type *layoutType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
2202
2203	int n_members = structTy->get_baseStruct()->get_members().size();
2204	if ( n_members == 0 ) {
2205	// all empty structs have the same layout - size 1, align 1
2206	makeVar( sizeofName( typeName ), layoutType, new SingleInit( new ConstantExpr( Constant::from_ulong( (unsigned long)1 ) ) ) );
2207	makeVar( alignofName( typeName ), layoutType->clone(), new SingleInit( new ConstantExpr( Constant::from_ulong( (unsigned long)1 ) ) ) );
2208	// NOTE zero-length arrays are forbidden in C, so empty structs have no offsetof array
2209	} else {
2210	ObjectDecl *sizeVar = makeVar( sizeofName( typeName ), layoutType );
2211	ObjectDecl *alignVar = makeVar( alignofName( typeName ), layoutType->clone() );
2212	ObjectDecl *offsetVar = makeVar( offsetofName( typeName ), new ArrayType( Type::Qualifiers(), layoutType->clone(), new ConstantExpr( Constant::from_int( n_members ) ), false, false ) );
2213
2214	// generate call to layout function
2215	UntypedExpr *layoutCall = new UntypedExpr( new NameExpr( layoutofName( structTy->get_baseStruct() ) ) );
2216	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( sizeVar ) ) );
2217	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( alignVar ) ) );
2218	layoutCall->get_args().push_back( new VariableExpr( offsetVar ) );
2219	addOtypeParamsToLayoutCall( layoutCall, otypeParams );
2220
2221	stmtsToAdd.push_back( new ExprStmt( noLabels, layoutCall ) );
2222	}
2223
2224	return true;
2225	} else if ( UnionInstType unionTy = dynamic_cast< UnionInstType >( ty ) ) {
2226	// check if this type already has a layout generated for it
2227	std::string typeName = mangleType( ty );
2228	if ( knownLayouts.find( typeName ) != knownLayouts.end() ) return true;
2229
2230	// check if any of the type parameters have dynamic layout; if none do, this type is (or will be) monomorphized
2231	std::list< Type* > otypeParams;
2232	if ( ! findGenericParams( *unionTy->get_baseParameters(), unionTy->get_parameters(), otypeParams ) ) return false;
2233
2234	// insert local variables for layout and generate call to layout function
2235	knownLayouts.insert( typeName ); // done early so as not to interfere with the later addition of parameters to the layout call
2236	Type *layoutType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
2237
2238	ObjectDecl *sizeVar = makeVar( sizeofName( typeName ), layoutType );
2239	ObjectDecl *alignVar = makeVar( alignofName( typeName ), layoutType->clone() );
2240
2241	// generate call to layout function
2242	UntypedExpr *layoutCall = new UntypedExpr( new NameExpr( layoutofName( unionTy->get_baseUnion() ) ) );
2243	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( sizeVar ) ) );
2244	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( alignVar ) ) );
2245	addOtypeParamsToLayoutCall( layoutCall, otypeParams );
2246
2247	stmtsToAdd.push_back( new ExprStmt( noLabels, layoutCall ) );
2248
2249	return true;
2250	}
2251
2252	return false;
2253	}
2254
2255	Expression PolyGenericCalculator::mutate( SizeofExpr sizeofExpr ) {
2256	Type *ty = sizeofExpr->get_type();
2257	if ( findGeneric( ty ) ) {
2258	Expression *ret = new NameExpr( sizeofName( mangleType( ty ) ) );
2259	delete sizeofExpr;
2260	return ret;
2261	}
2262	return sizeofExpr;
2263	}
2264
2265	Expression PolyGenericCalculator::mutate( AlignofExpr alignofExpr ) {
2266	Type *ty = alignofExpr->get_type();
2267	if ( findGeneric( ty ) ) {
2268	Expression *ret = new NameExpr( alignofName( mangleType( ty ) ) );
2269	delete alignofExpr;
2270	return ret;
2271	}
2272	return alignofExpr;
2273	}
2274
2275	Expression PolyGenericCalculator::mutate( OffsetofExpr offsetofExpr ) {
2276	// mutate, exiting early if no longer OffsetofExpr
2277	Expression *expr = Mutator::mutate( offsetofExpr );
2278	offsetofExpr = dynamic_cast< OffsetofExpr* >( expr );
2279	if ( ! offsetofExpr ) return expr;
2280
2281	// only mutate expressions for polymorphic structs/unions
2282	Type *ty = offsetofExpr->get_type();
2283	if ( ! findGeneric( ty ) ) return offsetofExpr;
2284
2285	if ( StructInstType structType = dynamic_cast< StructInstType >( ty ) ) {
2286	// replace offsetof expression by index into offset array
2287	long i = findMember( offsetofExpr->get_member(), structType->get_baseStruct()->get_members() );
2288	if ( i == -1 ) return offsetofExpr;
2289
2290	Expression *offsetInd = makeOffsetIndex( ty, i );
2291	delete offsetofExpr;
2292	return offsetInd;
2293	} else if ( dynamic_cast< UnionInstType* >( ty ) ) {
2294	// all union members are at offset zero
2295	delete offsetofExpr;
2296	return new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), std::string("0") ) );
2297	} else return offsetofExpr;
2298	}
2299
2300	Expression PolyGenericCalculator::mutate( OffsetPackExpr offsetPackExpr ) {
2301	StructInstType *ty = offsetPackExpr->get_type();
2302
2303	Expression *ret = 0;
2304	if ( findGeneric( ty ) ) {
2305	// pull offset back from generated type information
2306	ret = new NameExpr( offsetofName( mangleType( ty ) ) );
2307	} else {
2308	std::string offsetName = offsetofName( mangleType( ty ) );
2309	if ( knownOffsets.find( offsetName ) != knownOffsets.end() ) {
2310	// use the already-generated offsets for this type
2311	ret = new NameExpr( offsetName );
2312	} else {
2313	knownOffsets.insert( offsetName );
2314
2315	std::list< Declaration* > &baseMembers = ty->get_baseStruct()->get_members();
2316	Type *offsetType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
2317
2318	// build initializer list for offset array
2319	std::list< Initializer* > inits;
2320	for ( std::list< Declaration* >::const_iterator member = baseMembers.begin(); member != baseMembers.end(); ++member ) {
2321	DeclarationWithType *memberDecl;
2322	if ( DeclarationWithType origMember = dynamic_cast< DeclarationWithType >( *member ) ) {
2323	memberDecl = origMember->clone();
2324	} else {
2325	memberDecl = new ObjectDecl( (*member)->get_name(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, offsetType->clone(), 0 );
2326	}
2327	inits.push_back( new SingleInit( new OffsetofExpr( ty->clone(), memberDecl ) ) );
2328	}
2329
2330	// build the offset array and replace the pack with a reference to it
2331	ObjectDecl *offsetArray = makeVar( offsetName, new ArrayType( Type::Qualifiers(), offsetType, new ConstantExpr( Constant::from_ulong( baseMembers.size() ) ), false, false ),
2332	new ListInit( inits ) );
2333	ret = new VariableExpr( offsetArray );
2334	}
2335	}
2336
2337	delete offsetPackExpr;
2338	return ret;
2339	}
2340
2341	void PolyGenericCalculator::doBeginScope() {
2342	knownLayouts.beginScope();
2343	knownOffsets.beginScope();
2344	}
2345
2346	void PolyGenericCalculator::doEndScope() {
2347	knownLayouts.endScope();
2348	knownOffsets.endScope();
2349	}
2350
2351	////////////////////////////////////////// Pass3 ////////////////////////////////////////////////////
2352
2353	template< typename DeclClass >
2354	DeclClass * Pass3::handleDecl( DeclClass decl, Type type ) {
2355	scopeTyVars.beginScope();
2356	makeTyVarMap( type, scopeTyVars );
2357
2358	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
2359	ScrubTyVars::scrub( decl, scopeTyVars );
2360
2361	scopeTyVars.endScope();
2362	return ret;
2363	}
2364
2365	ObjectDecl * Pass3::mutate( ObjectDecl *objectDecl ) {
2366	return handleDecl( objectDecl, objectDecl->get_type() );
2367	}
2368
2369	DeclarationWithType * Pass3::mutate( FunctionDecl *functionDecl ) {
2370	return handleDecl( functionDecl, functionDecl->get_functionType() );
2371	}
2372
2373	TypedefDecl * Pass3::mutate( TypedefDecl *typedefDecl ) {
2374	return handleDecl( typedefDecl, typedefDecl->get_base() );
2375	}
2376
2377	TypeDecl * Pass3::mutate( TypeDecl *typeDecl ) {
2378	// Initializer *init = 0;
2379	// std::list< Expression *> designators;
2380	// scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
2381	// if ( typeDecl->get_base() ) {
2382	// init = new SimpleInit( new SizeofExpr( handleDecl( typeDecl, typeDecl->get_base() ) ), designators );
2383	// }
2384	// return new ObjectDecl( typeDecl->get_name(), Declaration::Extern, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::UnsignedInt ), init );
2385
2386	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
2387	return Mutator::mutate( typeDecl );
2388	}
2389
2390	Type * Pass3::mutate( PointerType *pointerType ) {
2391	scopeTyVars.beginScope();
2392	makeTyVarMap( pointerType, scopeTyVars );
2393
2394	Type *ret = Mutator::mutate( pointerType );
2395
2396	scopeTyVars.endScope();
2397	return ret;
2398	}
2399
2400	Type * Pass3::mutate( FunctionType *functionType ) {
2401	scopeTyVars.beginScope();
2402	makeTyVarMap( functionType, scopeTyVars );
2403
2404	Type *ret = Mutator::mutate( functionType );
2405
2406	scopeTyVars.endScope();
2407	return ret;
2408	}
2409	} // anonymous namespace
2410	} // namespace GenPoly
2411
2412	// Local Variables: //
2413	// tab-width: 4 //
2414	// mode: c++ //
2415	// compile-command: "make install" //
2416	// End: //

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