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source: src/GenPoly/Box.cc @ ca26509

ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsctordeferred_resndemanglerenumforall-pointer-decaygc_noraiijacob/cs343-translationjenkins-sandboxmemorynew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newwith_gc

Last change on this file since ca26509 was 10a7775, checked in by Rob Schluntz <rschlunt@…>, 8 years ago
can use intrinsic constructors on const objects
Property mode set to `100644`
File size: 103.0 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 findAssignOps( const std::list< TypeDecl *> &forall );
200	void passAdapters( ApplicationExpr appExpr, FunctionType functionType, const TyVarMap &exprTyVars );
201	FunctionDecl makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars );
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	ResolvExpr::TypeMap< DeclarationWithType > scopedAssignOps; ///< Currently known assignment operators
209	ScopedMap< std::string, DeclarationWithType* > adapters; ///< Set of adapter functions in the current scope
210
211	DeclarationWithType *retval;
212	bool useRetval;
213	UniqueName tempNamer;
214	};
215
216	/// * Moves polymorphic returns in function types to pointer-type parameters
217	/// * adds type size and assertion parameters to parameter lists
218	class Pass2 : public PolyMutator {
219	public:
220	template< typename DeclClass >
221	DeclClass handleDecl( DeclClass decl, Type *type );
222	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
223	virtual ObjectDecl mutate( ObjectDecl objectDecl );
224	virtual TypeDecl mutate( TypeDecl typeDecl );
225	virtual TypedefDecl mutate( TypedefDecl typedefDecl );
226	virtual Type mutate( PointerType pointerType );
227	virtual Type mutate( FunctionType funcType );
228
229	private:
230	void addAdapters( FunctionType *functionType );
231
232	std::map< UniqueId, std::string > adapterName;
233	};
234
235	/// Mutator pass that replaces concrete instantiations of generic types with actual struct declarations, scoped appropriately
236	class GenericInstantiator : public DeclMutator {
237	/// Map of (generic type, parameter list) pairs to concrete type instantiations
238	InstantiationMap< AggregateDecl, AggregateDecl > instantiations;
239	/// Namer for concrete types
240	UniqueName typeNamer;
241
242	public:
243	GenericInstantiator() : DeclMutator(), instantiations(), typeNamer("_conc_") {}
244
245	virtual Type* mutate( StructInstType *inst );
246	virtual Type* mutate( UnionInstType *inst );
247
248	// virtual Expression* mutate( MemberExpr *memberExpr );
249
250	virtual void doBeginScope();
251	virtual void doEndScope();
252	private:
253	/// Wrap instantiation lookup for structs
254	StructDecl* lookup( StructInstType inst, const std::list< TypeExpr > &typeSubs ) { return (StructDecl*)instantiations.lookup( inst->get_baseStruct(), typeSubs ); }
255	/// Wrap instantiation lookup for unions
256	UnionDecl* lookup( UnionInstType inst, const std::list< TypeExpr > &typeSubs ) { return (UnionDecl*)instantiations.lookup( inst->get_baseUnion(), typeSubs ); }
257	/// Wrap instantiation insertion for structs
258	void insert( StructInstType inst, const std::list< TypeExpr > &typeSubs, StructDecl *decl ) { instantiations.insert( inst->get_baseStruct(), typeSubs, decl ); }
259	/// Wrap instantiation insertion for unions
260	void insert( UnionInstType inst, const std::list< TypeExpr > &typeSubs, UnionDecl *decl ) { instantiations.insert( inst->get_baseUnion(), typeSubs, decl ); }
261	};
262
263	/// Replaces member and size/align/offsetof expressions on polymorphic generic types with calculated expressions.
264	/// * Replaces member expressions for polymorphic types with calculated add-field-offset-and-dereference
265	/// * Calculates polymorphic offsetof expressions from offset array
266	/// * Inserts dynamic calculation of polymorphic type layouts where needed
267	class PolyGenericCalculator : public PolyMutator {
268	public:
269	template< typename DeclClass >
270	DeclClass handleDecl( DeclClass decl, Type *type );
271	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
272	virtual ObjectDecl mutate( ObjectDecl objectDecl );
273	virtual TypedefDecl mutate( TypedefDecl objectDecl );
274	virtual TypeDecl mutate( TypeDecl objectDecl );
275	virtual Statement mutate( DeclStmt declStmt );
276	virtual Type mutate( PointerType pointerType );
277	virtual Type mutate( FunctionType funcType );
278	virtual Expression mutate( MemberExpr memberExpr );
279	virtual Expression mutate( SizeofExpr sizeofExpr );
280	virtual Expression mutate( AlignofExpr alignofExpr );
281	virtual Expression mutate( OffsetofExpr offsetofExpr );
282	virtual Expression mutate( OffsetPackExpr offsetPackExpr );
283
284	virtual void doBeginScope();
285	virtual void doEndScope();
286
287	private:
288	/// Makes a new variable in the current scope with the given name, type & optional initializer
289	ObjectDecl makeVar( const std::string &name, Type type, Initializer *init = 0 );
290	/// returns true if the type has a dynamic layout; such a layout will be stored in appropriately-named local variables when the function returns
291	bool findGeneric( Type *ty );
292	/// adds type parameters to the layout call; will generate the appropriate parameters if needed
293	void addOtypeParamsToLayoutCall( UntypedExpr layoutCall, const std::list< Type > &otypeParams );
294
295	/// Enters a new scope for type-variables, adding the type variables from ty
296	void beginTypeScope( Type *ty );
297	/// Exits the type-variable scope
298	void endTypeScope();
299
300	ScopedSet< std::string > knownLayouts; ///< Set of generic type layouts known in the current scope, indexed by sizeofName
301	ScopedSet< std::string > knownOffsets; ///< Set of non-generic types for which the offset array exists in the current scope, indexed by offsetofName
302	};
303
304	/// Replaces initialization of polymorphic values with alloca, declaration of dtype/ftype with appropriate void expression, and sizeof expressions of polymorphic types with the proper variable
305	class Pass3 : public PolyMutator {
306	public:
307	template< typename DeclClass >
308	DeclClass handleDecl( DeclClass decl, Type *type );
309	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
310	virtual ObjectDecl mutate( ObjectDecl objectDecl );
311	virtual TypedefDecl mutate( TypedefDecl objectDecl );
312	virtual TypeDecl mutate( TypeDecl objectDecl );
313	virtual Type mutate( PointerType pointerType );
314	virtual Type mutate( FunctionType funcType );
315	private:
316	};
317
318	} // anonymous namespace
319
320	/// version of mutateAll with special handling for translation unit so you can check the end of the prelude when debugging
321	template< typename MutatorType >
322	inline void mutateTranslationUnit( std::list< Declaration* > &translationUnit, MutatorType &mutator ) {
323	bool seenIntrinsic = false;
324	SemanticError errors;
325	for ( typename std::list< Declaration* >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) {
326	try {
327	if ( *i ) {
328	if ( (*i)->get_linkage() == LinkageSpec::Intrinsic ) {
329	seenIntrinsic = true;
330	} else if ( seenIntrinsic ) {
331	seenIntrinsic = false; // break on this line when debugging for end of prelude
332	}
333
334	i = dynamic_cast< Declaration >( (*i)->acceptMutator( mutator ) );
335	assert( *i );
336	} // if
337	} catch( SemanticError &e ) {
338	errors.append( e );
339	} // try
340	} // for
341	if ( ! errors.isEmpty() ) {
342	throw errors;
343	} // if
344	}
345
346	void box( std::list< Declaration *>& translationUnit ) {
347	LayoutFunctionBuilder layoutBuilder;
348	Pass1 pass1;
349	Pass2 pass2;
350	GenericInstantiator instantiator;
351	PolyGenericCalculator polyCalculator;
352	Pass3 pass3;
353
354	layoutBuilder.mutateDeclarationList( translationUnit );
355	mutateTranslationUnit/All/( translationUnit, pass1 );
356	mutateTranslationUnit/All/( translationUnit, pass2 );
357	instantiator.mutateDeclarationList( translationUnit );
358	mutateTranslationUnit/All/( translationUnit, polyCalculator );
359	mutateTranslationUnit/All/( translationUnit, pass3 );
360	}
361
362	////////////////////////////////// LayoutFunctionBuilder ////////////////////////////////////////////
363
364	DeclarationWithType LayoutFunctionBuilder::mutate( FunctionDecl functionDecl ) {
365	functionDecl->set_functionType( maybeMutate( functionDecl->get_functionType(), *this ) );
366	mutateAll( functionDecl->get_oldDecls(), *this );
367	++functionNesting;
368	functionDecl->set_statements( maybeMutate( functionDecl->get_statements(), *this ) );
369	--functionNesting;
370	return functionDecl;
371	}
372
373	/// Get a list of type declarations that will affect a layout function
374	std::list< TypeDecl* > takeOtypeOnly( std::list< TypeDecl* > &decls ) {
375	std::list< TypeDecl * > otypeDecls;
376
377	for ( std::list< TypeDecl* >::const_iterator decl = decls.begin(); decl != decls.end(); ++decl ) {
378	if ( (*decl)->get_kind() == TypeDecl::Any ) {
379	otypeDecls.push_back( *decl );
380	}
381	}
382
383	return otypeDecls;
384	}
385
386	/// Adds parameters for otype layout to a function type
387	void addOtypeParams( FunctionType layoutFnType, std::list< TypeDecl > &otypeParams ) {
388	BasicType sizeAlignType( Type::Qualifiers(), BasicType::LongUnsignedInt );
389
390	for ( std::list< TypeDecl* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
391	TypeInstType paramType( Type::Qualifiers(), (param)->get_name(), param );
392	std::string paramName = mangleType( &paramType );
393	layoutFnType->get_parameters().push_back( new ObjectDecl( sizeofName( paramName ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
394	layoutFnType->get_parameters().push_back( new ObjectDecl( alignofName( paramName ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
395	}
396	}
397
398	/// Builds a layout function declaration
399	FunctionDecl buildLayoutFunctionDecl( AggregateDecl typeDecl, unsigned int functionNesting, FunctionType *layoutFnType ) {
400	// Routines at global scope marked "static" to prevent multiple definitions is separate translation units
401	// because each unit generates copies of the default routines for each aggregate.
402	FunctionDecl *layoutDecl = new FunctionDecl(
403	layoutofName( typeDecl ), functionNesting > 0 ? DeclarationNode::NoStorageClass : DeclarationNode::Static, LinkageSpec::AutoGen, layoutFnType, new CompoundStmt( noLabels ), true, false );
404	layoutDecl->fixUniqueId();
405	return layoutDecl;
406	}
407
408	/// Makes a unary operation
409	Expression makeOp( const std::string &name, Expression arg ) {
410	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
411	expr->get_args().push_back( arg );
412	return expr;
413	}
414
415	/// Makes a binary operation
416	Expression makeOp( const std::string &name, Expression lhs, Expression *rhs ) {
417	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
418	expr->get_args().push_back( lhs );
419	expr->get_args().push_back( rhs );
420	return expr;
421	}
422
423	/// Returns the dereference of a local pointer variable
424	Expression derefVar( ObjectDecl var ) {
425	return makeOp( "*?", new VariableExpr( var ) );
426	}
427
428	/// makes an if-statement with a single-expression if-block and no then block
429	Statement makeCond( Expression cond, Expression *ifPart ) {
430	return new IfStmt( noLabels, cond, new ExprStmt( noLabels, ifPart ), 0 );
431	}
432
433	/// makes a statement that assigns rhs to lhs if lhs < rhs
434	Statement makeAssignMax( Expression lhs, Expression *rhs ) {
435	return makeCond( makeOp( "?<?", lhs, rhs ), makeOp( "?=?", lhs->clone(), rhs->clone() ) );
436	}
437
438	/// makes a statement that aligns lhs to rhs (rhs should be an integer power of two)
439	Statement makeAlignTo( Expression lhs, Expression *rhs ) {
440	// check that the lhs is zeroed out to the level of rhs
441	Expression *ifCond = makeOp( "?&?", lhs, makeOp( "?-?", rhs, new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), "1" ) ) ) );
442	// if not aligned, increment to alignment
443	Expression *ifExpr = makeOp( "?+=?", lhs->clone(), makeOp( "?-?", rhs->clone(), ifCond->clone() ) );
444	return makeCond( ifCond, ifExpr );
445	}
446
447	/// adds an expression to a compound statement
448	void addExpr( CompoundStmt stmts, Expression expr ) {
449	stmts->get_kids().push_back( new ExprStmt( noLabels, expr ) );
450	}
451
452	/// adds a statement to a compound statement
453	void addStmt( CompoundStmt stmts, Statement stmt ) {
454	stmts->get_kids().push_back( stmt );
455	}
456
457	Declaration LayoutFunctionBuilder::mutate( StructDecl structDecl ) {
458	// do not generate layout function for "empty" tag structs
459	if ( structDecl->get_members().empty() ) return structDecl;
460
461	// get parameters that can change layout, exiting early if none
462	std::list< TypeDecl* > otypeParams = takeOtypeOnly( structDecl->get_parameters() );
463	if ( otypeParams.empty() ) return structDecl;
464
465	// build layout function signature
466	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
467	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
468	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
469
470	ObjectDecl *sizeParam = new ObjectDecl( sizeofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
471	layoutFnType->get_parameters().push_back( sizeParam );
472	ObjectDecl *alignParam = new ObjectDecl( alignofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
473	layoutFnType->get_parameters().push_back( alignParam );
474	ObjectDecl *offsetParam = new ObjectDecl( offsetofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
475	layoutFnType->get_parameters().push_back( offsetParam );
476	addOtypeParams( layoutFnType, otypeParams );
477
478	// build function decl
479	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( structDecl, functionNesting, layoutFnType );
480
481	// calculate struct layout in function body
482
483	// initialize size and alignment to 0 and 1 (will have at least one member to re-edit size
484	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "0" ) ) ) );
485	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
486	unsigned long n_members = 0;
487	bool firstMember = true;
488	for ( std::list< Declaration* >::const_iterator member = structDecl->get_members().begin(); member != structDecl->get_members().end(); ++member ) {
489	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
490	assert( dwt );
491	Type *memberType = dwt->get_type();
492
493	if ( firstMember ) {
494	firstMember = false;
495	} else {
496	// make sure all members after the first (automatically aligned at 0) are properly padded for alignment
497	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), new AlignofExpr( memberType->clone() ) ) );
498	}
499
500	// place current size in the current offset index
501	addExpr( layoutDecl->get_statements(), makeOp( "?=?", makeOp( "?[?]", new VariableExpr( offsetParam ), new ConstantExpr( Constant::from_ulong( n_members ) ) ),
502	derefVar( sizeParam ) ) );
503	++n_members;
504
505	// add member size to current size
506	addExpr( layoutDecl->get_statements(), makeOp( "?+=?", derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
507
508	// take max of member alignment and global alignment
509	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
510	}
511	// make sure the type is end-padded to a multiple of its alignment
512	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
513
514	addDeclarationAfter( layoutDecl );
515	return structDecl;
516	}
517
518	Declaration LayoutFunctionBuilder::mutate( UnionDecl unionDecl ) {
519	// do not generate layout function for "empty" tag unions
520	if ( unionDecl->get_members().empty() ) return unionDecl;
521
522	// get parameters that can change layout, exiting early if none
523	std::list< TypeDecl* > otypeParams = takeOtypeOnly( unionDecl->get_parameters() );
524	if ( otypeParams.empty() ) return unionDecl;
525
526	// build layout function signature
527	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
528	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
529	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
530
531	ObjectDecl *sizeParam = new ObjectDecl( sizeofName( unionDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
532	layoutFnType->get_parameters().push_back( sizeParam );
533	ObjectDecl *alignParam = new ObjectDecl( alignofName( unionDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
534	layoutFnType->get_parameters().push_back( alignParam );
535	addOtypeParams( layoutFnType, otypeParams );
536
537	// build function decl
538	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( unionDecl, functionNesting, layoutFnType );
539
540	// calculate union layout in function body
541	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
542	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
543	for ( std::list< Declaration* >::const_iterator member = unionDecl->get_members().begin(); member != unionDecl->get_members().end(); ++member ) {
544	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
545	assert( dwt );
546	Type *memberType = dwt->get_type();
547
548	// take max member size and global size
549	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
550
551	// take max of member alignment and global alignment
552	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
553	}
554	// make sure the type is end-padded to a multiple of its alignment
555	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
556
557	addDeclarationAfter( layoutDecl );
558	return unionDecl;
559	}
560
561	////////////////////////////////////////// Pass1 ////////////////////////////////////////////////////
562
563	namespace {
564	std::string makePolyMonoSuffix( FunctionType * function, const TyVarMap &tyVars ) {
565	std::stringstream name;
566
567	// NOTE: this function previously used isPolyObj, which failed to produce
568	// the correct thing in some situations. It's not clear to me why this wasn't working.
569
570	// if the return type or a parameter type involved polymorphic types, then the adapter will need
571	// to take those polymorphic types as pointers. Therefore, there can be two different functions
572	// with the same mangled name, so we need to further mangle the names.
573	for ( std::list< DeclarationWithType *>::iterator retval = function->get_returnVals().begin(); retval != function->get_returnVals().end(); ++retval ) {
574	if ( isPolyType( (*retval)->get_type(), tyVars ) ) {
575	name << "P";
576	} else {
577	name << "M";
578	}
579	}
580	name << "_";
581	std::list< DeclarationWithType *> &paramList = function->get_parameters();
582	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
583	if ( isPolyType( (*arg)->get_type(), tyVars ) ) {
584	name << "P";
585	} else {
586	name << "M";
587	}
588	} // for
589	return name.str();
590	}
591
592	std::string mangleAdapterName( FunctionType * function, const TyVarMap &tyVars ) {
593	return SymTab::Mangler::mangle( function ) + makePolyMonoSuffix( function, tyVars );
594	}
595
596	std::string makeAdapterName( const std::string &mangleName ) {
597	return "_adapter" + mangleName;
598	}
599
600	Pass1::Pass1() : useRetval( false ), tempNamer( "_temp" ) {}
601
602	/// Returns T if the given declaration is (?=?)(T , T) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
603	TypeInstType isTypeInstAssignment( DeclarationWithType decl ) {
604	if ( decl->get_name() == "?=?" ) {
605	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
606	if ( funType->get_parameters().size() == 2 ) {
607	if ( PointerType pointer = dynamic_cast< PointerType >( funType->get_parameters().front()->get_type() ) ) {
608	if ( TypeInstType refType = dynamic_cast< TypeInstType >( pointer->get_base() ) ) {
609	if ( TypeInstType refType2 = dynamic_cast< TypeInstType >( funType->get_parameters().back()->get_type() ) ) {
610	if ( refType->get_name() == refType2->get_name() ) {
611	return refType;
612	} // if
613	} // if
614	} // if
615	} // if
616	} // if
617	} // if
618	} // if
619	return 0;
620	}
621
622	/// returns T if the given declaration is: (?=?)(T , T) for some type T (return not checked, but maybe should be), NULL otherwise
623	/// Only picks assignments where neither parameter is cv-qualified
624	Type isAssignment( DeclarationWithType decl ) {
625	if ( decl->get_name() == "?=?" ) {
626	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
627	if ( funType->get_parameters().size() == 2 ) {
628	Type::Qualifiers defaultQualifiers;
629	Type *paramType1 = funType->get_parameters().front()->get_type();
630	if ( paramType1->get_qualifiers() != defaultQualifiers ) return 0;
631	Type *paramType2 = funType->get_parameters().back()->get_type();
632	if ( paramType2->get_qualifiers() != defaultQualifiers ) return 0;
633
634	if ( PointerType pointerType = dynamic_cast< PointerType >( paramType1 ) ) {
635	Type *baseType1 = pointerType->get_base();
636	if ( baseType1->get_qualifiers() != defaultQualifiers ) return 0;
637	SymTab::Indexer dummy;
638	if ( ResolvExpr::typesCompatible( baseType1, paramType2, dummy ) ) {
639	return baseType1;
640	} // if
641	} // if
642	} // if
643	} // if
644	} // if
645	return 0;
646	}
647
648	void Pass1::findAssignOps( const std::list< TypeDecl *> &forall ) {
649	// what if a nested function uses an assignment operator?
650	// assignOps.clear();
651	for ( std::list< TypeDecl *>::const_iterator i = forall.begin(); i != forall.end(); ++i ) {
652	for ( std::list< DeclarationWithType >::const_iterator assert = (i)->get_assertions().begin(); assert != (*i)->get_assertions().end(); ++assert ) {
653	std::string typeName;
654	if ( TypeInstType typeInst = isTypeInstAssignment( assert ) ) {
655	assignOps[ typeInst->get_name() ] = *assert;
656	} // if
657	} // for
658	} // for
659	}
660
661	DeclarationWithType Pass1::mutate( FunctionDecl functionDecl ) {
662	// if this is a assignment function, put it in the map for this scope
663	if ( Type *assignedType = isAssignment( functionDecl ) ) {
664	if ( ! dynamic_cast< TypeInstType* >( assignedType ) ) {
665	scopedAssignOps.insert( assignedType, functionDecl );
666	}
667	}
668
669	if ( functionDecl->get_statements() ) { // empty routine body ?
670	doBeginScope();
671	scopeTyVars.beginScope();
672	assignOps.beginScope();
673	DeclarationWithType *oldRetval = retval;
674	bool oldUseRetval = useRetval;
675
676	// process polymorphic return value
677	retval = 0;
678	if ( isPolyRet( functionDecl->get_functionType() ) && functionDecl->get_linkage() == LinkageSpec::Cforall ) {
679	retval = functionDecl->get_functionType()->get_returnVals().front();
680
681	// give names to unnamed return values
682	if ( retval->get_name() == "" ) {
683	retval->set_name( "_retparm" );
684	retval->set_linkage( LinkageSpec::C );
685	} // if
686	} // if
687
688	FunctionType *functionType = functionDecl->get_functionType();
689	makeTyVarMap( functionDecl->get_functionType(), scopeTyVars );
690	findAssignOps( functionDecl->get_functionType()->get_forall() );
691
692	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
693	std::list< FunctionType *> functions;
694	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
695	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
696	findFunction( (*assert)->get_type(), functions, scopeTyVars, needsAdapter );
697	} // for
698	} // for
699	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
700	findFunction( (*arg)->get_type(), functions, scopeTyVars, needsAdapter );
701	} // for
702
703	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
704	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
705	if ( adapters.find( mangleName ) == adapters.end() ) {
706	std::string adapterName = makeAdapterName( mangleName );
707	adapters.insert( std::pair< std::string, DeclarationWithType >( mangleName, new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( funType, scopeTyVars ) ), 0 ) ) );
708	} // if
709	} // for
710
711	functionDecl->set_statements( functionDecl->get_statements()->acceptMutator( *this ) );
712
713	scopeTyVars.endScope();
714	assignOps.endScope();
715	retval = oldRetval;
716	useRetval = oldUseRetval;
717	doEndScope();
718	} // if
719	return functionDecl;
720	}
721
722	TypeDecl Pass1::mutate( TypeDecl typeDecl ) {
723	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
724	return Mutator::mutate( typeDecl );
725	}
726
727	Expression Pass1::mutate( CommaExpr commaExpr ) {
728	bool oldUseRetval = useRetval;
729	useRetval = false;
730	commaExpr->set_arg1( maybeMutate( commaExpr->get_arg1(), *this ) );
731	useRetval = oldUseRetval;
732	commaExpr->set_arg2( maybeMutate( commaExpr->get_arg2(), *this ) );
733	return commaExpr;
734	}
735
736	Expression Pass1::mutate( ConditionalExpr condExpr ) {
737	bool oldUseRetval = useRetval;
738	useRetval = false;
739	condExpr->set_arg1( maybeMutate( condExpr->get_arg1(), *this ) );
740	useRetval = oldUseRetval;
741	condExpr->set_arg2( maybeMutate( condExpr->get_arg2(), *this ) );
742	condExpr->set_arg3( maybeMutate( condExpr->get_arg3(), *this ) );
743	return condExpr;
744
745	}
746
747	void Pass1::passArgTypeVars( ApplicationExpr appExpr, Type parmType, Type argBaseType, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars, std::set< std::string > &seenTypes ) {
748	Type *polyType = isPolyType( parmType, exprTyVars );
749	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
750	std::string typeName = mangleType( polyType );
751	if ( seenTypes.count( typeName ) ) return;
752
753	arg = appExpr->get_args().insert( arg, new SizeofExpr( argBaseType->clone() ) );
754	arg++;
755	arg = appExpr->get_args().insert( arg, new AlignofExpr( argBaseType->clone() ) );
756	arg++;
757	if ( dynamic_cast< StructInstType* >( polyType ) ) {
758	if ( StructInstType argBaseStructType = dynamic_cast< StructInstType >( argBaseType ) ) {
759	// zero-length arrays are forbidden by C, so don't pass offset for empty struct
760	if ( ! argBaseStructType->get_baseStruct()->get_members().empty() ) {
761	arg = appExpr->get_args().insert( arg, new OffsetPackExpr( argBaseStructType->clone() ) );
762	arg++;
763	}
764	} else {
765	throw SemanticError( "Cannot pass non-struct type for generic struct" );
766	}
767	}
768
769	seenTypes.insert( typeName );
770	}
771	}
772
773	void Pass1::passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
774	// pass size/align for type variables
775	for ( TyVarMap::const_iterator tyParm = exprTyVars.begin(); tyParm != exprTyVars.end(); ++tyParm ) {
776	ResolvExpr::EqvClass eqvClass;
777	assert( env );
778	if ( tyParm->second == TypeDecl::Any ) {
779	Type *concrete = env->lookup( tyParm->first );
780	if ( concrete ) {
781	arg = appExpr->get_args().insert( arg, new SizeofExpr( concrete->clone() ) );
782	arg++;
783	arg = appExpr->get_args().insert( arg, new AlignofExpr( concrete->clone() ) );
784	arg++;
785	} else {
786	/// xxx - should this be an assertion?
787	throw SemanticError( "unbound type variable: " + tyParm->first + " in application ", appExpr );
788	} // if
789	} // if
790	} // for
791
792	// add size/align for generic types to parameter list
793	if ( appExpr->get_function()->get_results().empty() ) return;
794	FunctionType *funcType = getFunctionType( appExpr->get_function()->get_results().front() );
795	assert( funcType );
796
797	std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin();
798	std::list< Expression* >::const_iterator fnArg = arg;
799	std::set< std::string > seenTypes; //< names for generic types we've seen
800
801	// a polymorphic return type may need to be added to the argument list
802	if ( polyRetType ) {
803	Type *concRetType = replaceWithConcrete( appExpr, polyRetType );
804	passArgTypeVars( appExpr, polyRetType, concRetType, arg, exprTyVars, seenTypes );
805	}
806
807	// add type information args for presently unseen types in parameter list
808	for ( ; fnParm != funcType->get_parameters().end() && fnArg != appExpr->get_args().end(); ++fnParm, ++fnArg ) {
809	VariableExpr fnArgBase = getBaseVar( fnArg );
810	if ( ! fnArgBase \|\| fnArgBase->get_results().empty() ) continue;
811	passArgTypeVars( appExpr, (*fnParm)->get_type(), fnArgBase->get_results().front(), arg, exprTyVars, seenTypes );
812	}
813	}
814
815	ObjectDecl Pass1::makeTemporary( Type type ) {
816	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, 0 );
817	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
818	return newObj;
819	}
820
821	Expression Pass1::addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg ) {
822	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
823	// if ( useRetval ) {
824	// assert( retval );
825	// arg = appExpr->get_args().insert( arg, new VariableExpr( retval ) );
826	// arg++;
827	// } else {
828
829	// Create temporary to hold return value of polymorphic function and produce that temporary as a result
830	// using a comma expression. Possibly change comma expression into statement expression "{}" for multiple
831	// return values.
832	ObjectDecl *newObj = makeTemporary( retType->clone() );
833	Expression *paramExpr = new VariableExpr( newObj );
834
835	// If the type of the temporary is not polymorphic, box temporary by taking its address;
836	// otherwise the temporary is already boxed and can be used directly.
837	if ( ! isPolyType( newObj->get_type(), scopeTyVars, env ) ) {
838	paramExpr = new AddressExpr( paramExpr );
839	} // if
840	arg = appExpr->get_args().insert( arg, paramExpr ); // add argument to function call
841	arg++;
842	// Build a comma expression to call the function and emulate a normal return.
843	CommaExpr *commaExpr = new CommaExpr( appExpr, new VariableExpr( newObj ) );
844	commaExpr->set_env( appExpr->get_env() );
845	appExpr->set_env( 0 );
846	return commaExpr;
847	// } // if
848	// return appExpr;
849	}
850
851	void Pass1::replaceParametersWithConcrete( ApplicationExpr appExpr, std::list< Expression >& params ) {
852	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
853	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
854	assert(paramType && "Aggregate parameters should be type expressions");
855	paramType->set_type( replaceWithConcrete( appExpr, paramType->get_type(), false ) );
856	}
857	}
858
859	Type Pass1::replaceWithConcrete( ApplicationExpr appExpr, Type *type, bool doClone ) {
860	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
861	Type *concrete = env->lookup( typeInst->get_name() );
862	if ( concrete == 0 ) {
863	throw SemanticError( "Unbound type variable " + typeInst->get_name() + " in ", appExpr );
864	} // if
865	return concrete;
866	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
867	if ( doClone ) {
868	structType = structType->clone();
869	}
870	replaceParametersWithConcrete( appExpr, structType->get_parameters() );
871	return structType;
872	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
873	if ( doClone ) {
874	unionType = unionType->clone();
875	}
876	replaceParametersWithConcrete( appExpr, unionType->get_parameters() );
877	return unionType;
878	}
879	return type;
880	}
881
882	Expression Pass1::addPolyRetParam( ApplicationExpr appExpr, FunctionType function, ReferenceToType polyType, std::list< Expression *>::iterator &arg ) {
883	assert( env );
884	Type *concrete = replaceWithConcrete( appExpr, polyType );
885	// add out-parameter for return value
886	return addRetParam( appExpr, function, concrete, arg );
887	}
888
889	Expression Pass1::applyAdapter( ApplicationExpr appExpr, FunctionType function, std::list< Expression >::iterator &arg, const TyVarMap &tyVars ) {
890	Expression *ret = appExpr;
891	if ( ! function->get_returnVals().empty() && isPolyType( function->get_returnVals().front()->get_type(), tyVars ) ) {
892	ret = addRetParam( appExpr, function, function->get_returnVals().front()->get_type(), arg );
893	} // if
894	std::string mangleName = mangleAdapterName( function, tyVars );
895	std::string adapterName = makeAdapterName( mangleName );
896
897	// cast adaptee to void (*)(), since it may have any type inside a polymorphic function
898	Type * adapteeType = new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) );
899	appExpr->get_args().push_front( new CastExpr( appExpr->get_function(), adapteeType ) );
900	appExpr->set_function( new NameExpr( adapterName ) );
901
902	return ret;
903	}
904
905	void Pass1::boxParam( Type param, Expression &arg, const TyVarMap &exprTyVars ) {
906	assert( ! arg->get_results().empty() );
907	if ( isPolyType( param, exprTyVars ) ) {
908	if ( isPolyType( arg->get_results().front() ) ) {
909	// if the argument's type is polymorphic, we don't need to box again!
910	return;
911	} else if ( arg->get_results().front()->get_isLvalue() ) {
912	// VariableExpr and MemberExpr are lvalues; need to check this isn't coming from the second arg of a comma expression though (not an lvalue)
913	// xxx - need to test that this code is still reachable
914	if ( CommaExpr commaArg = dynamic_cast< CommaExpr >( arg ) ) {
915	commaArg->set_arg2( new AddressExpr( commaArg->get_arg2() ) );
916	} else {
917	arg = new AddressExpr( arg );
918	}
919	} else {
920	// use type computed in unification to declare boxed variables
921	Type * newType = param->clone();
922	if ( env ) env->apply( newType );
923	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, newType, 0 );
924	newObj->get_type()->get_qualifiers() = Type::Qualifiers(); // TODO: is this right???
925	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
926	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
927	assign->get_args().push_back( new VariableExpr( newObj ) );
928	assign->get_args().push_back( arg );
929	stmtsToAdd.push_back( new ExprStmt( noLabels, assign ) );
930	arg = new AddressExpr( new VariableExpr( newObj ) );
931	} // if
932	} // if
933	}
934
935	/// cast parameters to polymorphic functions so that types are replaced with
936	/// void * if they are type parameters in the formal type.
937	/// this gets rid of warnings from gcc.
938	void addCast( Expression &actual, Type formal, const TyVarMap &tyVars ) {
939	Type * newType = formal->clone();
940	if ( getFunctionType( newType ) ) {
941	newType = ScrubTyVars::scrub( newType, tyVars );
942	actual = new CastExpr( actual, newType );
943	} // if
944	}
945
946	void Pass1::boxParams( ApplicationExpr appExpr, FunctionType function, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
947	for ( std::list< DeclarationWithType *>::const_iterator param = function->get_parameters().begin(); param != function->get_parameters().end(); ++param, ++arg ) {
948	assert( arg != appExpr->get_args().end() );
949	addCast( arg, (param)->get_type(), exprTyVars );
950	boxParam( (param)->get_type(), arg, exprTyVars );
951	} // for
952	}
953
954	void Pass1::addInferredParams( ApplicationExpr appExpr, FunctionType functionType, std::list< Expression *>::iterator &arg, const TyVarMap &tyVars ) {
955	std::list< Expression *>::iterator cur = arg;
956	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
957	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
958	InferredParams::const_iterator inferParam = appExpr->get_inferParams().find( (*assert)->get_uniqueId() );
959	assert( inferParam != appExpr->get_inferParams().end() && "NOTE: Explicit casts of polymorphic functions to compatible monomorphic functions are currently unsupported" );
960	Expression *newExpr = inferParam->second.expr->clone();
961	addCast( newExpr, (*assert)->get_type(), tyVars );
962	boxParam( (*assert)->get_type(), newExpr, tyVars );
963	appExpr->get_args().insert( cur, newExpr );
964	} // for
965	} // for
966	}
967
968	void makeRetParm( FunctionType *funcType ) {
969	DeclarationWithType *retParm = funcType->get_returnVals().front();
970
971	// make a new parameter that is a pointer to the type of the old return value
972	retParm->set_type( new PointerType( Type::Qualifiers(), retParm->get_type() ) );
973	funcType->get_parameters().push_front( retParm );
974
975	// we don't need the return value any more
976	funcType->get_returnVals().clear();
977	}
978
979	FunctionType makeAdapterType( FunctionType adaptee, const TyVarMap &tyVars ) {
980	// actually make the adapter type
981	FunctionType *adapter = adaptee->clone();
982	if ( ! adapter->get_returnVals().empty() && isPolyType( adapter->get_returnVals().front()->get_type(), tyVars ) ) {
983	makeRetParm( adapter );
984	} // if
985	adapter->get_parameters().push_front( new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) ), 0 ) );
986	return adapter;
987	}
988
989	Expression makeAdapterArg( DeclarationWithType param, DeclarationWithType arg, DeclarationWithType realParam, const TyVarMap &tyVars ) {
990	assert( param );
991	assert( arg );
992	if ( isPolyType( realParam->get_type(), tyVars ) ) {
993	if ( ! isPolyType( arg->get_type() ) ) {
994	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
995	deref->get_args().push_back( new CastExpr( new VariableExpr( param ), new PointerType( Type::Qualifiers(), arg->get_type()->clone() ) ) );
996	deref->get_results().push_back( arg->get_type()->clone() );
997	return deref;
998	} // if
999	} // if
1000	return new VariableExpr( param );
1001	}
1002
1003	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 ) {
1004	UniqueName paramNamer( "_p" );
1005	for ( ; param != paramEnd; ++param, ++arg, ++realParam ) {
1006	if ( (*param)->get_name() == "" ) {
1007	(*param)->set_name( paramNamer.newName() );
1008	(*param)->set_linkage( LinkageSpec::C );
1009	} // if
1010	adapteeApp->get_args().push_back( makeAdapterArg( param, arg, *realParam, tyVars ) );
1011	} // for
1012	}
1013
1014	FunctionDecl Pass1::makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars ) {
1015	FunctionType *adapterType = makeAdapterType( adaptee, tyVars );
1016	adapterType = ScrubTyVars::scrub( adapterType, tyVars );
1017	DeclarationWithType *adapteeDecl = adapterType->get_parameters().front();
1018	adapteeDecl->set_name( "_adaptee" );
1019	ApplicationExpr *adapteeApp = new ApplicationExpr( new CastExpr( new VariableExpr( adapteeDecl ), new PointerType( Type::Qualifiers(), realType ) ) );
1020	Statement *bodyStmt;
1021
1022	std::list< TypeDecl *>::iterator tyArg = realType->get_forall().begin();
1023	std::list< TypeDecl *>::iterator tyParam = adapterType->get_forall().begin();
1024	std::list< TypeDecl *>::iterator realTyParam = adaptee->get_forall().begin();
1025	for ( ; tyParam != adapterType->get_forall().end(); ++tyArg, ++tyParam, ++realTyParam ) {
1026	assert( tyArg != realType->get_forall().end() );
1027	std::list< DeclarationWithType >::iterator assertArg = (tyArg)->get_assertions().begin();
1028	std::list< DeclarationWithType >::iterator assertParam = (tyParam)->get_assertions().begin();
1029	std::list< DeclarationWithType >::iterator realAssertParam = (realTyParam)->get_assertions().begin();
1030	for ( ; assertParam != (*tyParam)->get_assertions().end(); ++assertArg, ++assertParam, ++realAssertParam ) {
1031	assert( assertArg != (*tyArg)->get_assertions().end() );
1032	adapteeApp->get_args().push_back( makeAdapterArg( assertParam, assertArg, *realAssertParam, tyVars ) );
1033	} // for
1034	} // for
1035
1036	std::list< DeclarationWithType *>::iterator arg = realType->get_parameters().begin();
1037	std::list< DeclarationWithType *>::iterator param = adapterType->get_parameters().begin();
1038	std::list< DeclarationWithType *>::iterator realParam = adaptee->get_parameters().begin();
1039	param++; // skip adaptee parameter in the adapter type
1040	if ( realType->get_returnVals().empty() ) {
1041	// void return
1042	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1043	bodyStmt = new ExprStmt( noLabels, adapteeApp );
1044	} else if ( isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
1045	// return type T
1046	if ( (*param)->get_name() == "" ) {
1047	(*param)->set_name( "_ret" );
1048	(*param)->set_linkage( LinkageSpec::C );
1049	} // if
1050	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
1051	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
1052	deref->get_args().push_back( new CastExpr( new VariableExpr( *param++ ), new PointerType( Type::Qualifiers(), realType->get_returnVals().front()->get_type()->clone() ) ) );
1053	assign->get_args().push_back( deref );
1054	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1055	assign->get_args().push_back( adapteeApp );
1056	bodyStmt = new ExprStmt( noLabels, assign );
1057	} else {
1058	// adapter for a function that returns a monomorphic value
1059	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1060	bodyStmt = new ReturnStmt( noLabels, adapteeApp );
1061	} // if
1062	CompoundStmt *adapterBody = new CompoundStmt( noLabels );
1063	adapterBody->get_kids().push_back( bodyStmt );
1064	std::string adapterName = makeAdapterName( mangleName );
1065	return new FunctionDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, adapterType, adapterBody, false, false );
1066	}
1067
1068	void Pass1::passAdapters( ApplicationExpr * appExpr, FunctionType * functionType, const TyVarMap & exprTyVars ) {
1069	// collect a list of function types passed as parameters or implicit parameters (assertions)
1070	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
1071	std::list< FunctionType *> functions;
1072	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
1073	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
1074	findFunction( (*assert)->get_type(), functions, exprTyVars, needsAdapter );
1075	} // for
1076	} // for
1077	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
1078	findFunction( (*arg)->get_type(), functions, exprTyVars, needsAdapter );
1079	} // for
1080
1081	// parameter function types for which an appropriate adapter has been generated. we cannot use the types
1082	// after applying substitutions, since two different parameter types may be unified to the same type
1083	std::set< std::string > adaptersDone;
1084
1085	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
1086	FunctionType originalFunction = (funType)->clone();
1087	FunctionType realFunction = (funType)->clone();
1088	std::string mangleName = SymTab::Mangler::mangle( realFunction );
1089
1090	// only attempt to create an adapter or pass one as a parameter if we haven't already done so for this
1091	// pre-substitution parameter function type.
1092	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
1093	adaptersDone.insert( adaptersDone.begin(), mangleName );
1094
1095	// apply substitution to type variables to figure out what the adapter's type should look like
1096	assert( env );
1097	env->apply( realFunction );
1098	mangleName = SymTab::Mangler::mangle( realFunction );
1099	mangleName += makePolyMonoSuffix( originalFunction, exprTyVars );
1100
1101	typedef ScopedMap< std::string, DeclarationWithType* >::iterator AdapterIter;
1102	AdapterIter adapter = adapters.find( mangleName );
1103	if ( adapter == adapters.end() ) {
1104	// adapter has not been created yet in the current scope, so define it
1105	FunctionDecl newAdapter = makeAdapter( funType, realFunction, mangleName, exprTyVars );
1106	std::pair< AdapterIter, bool > answer = adapters.insert( std::pair< std::string, DeclarationWithType *>( mangleName, newAdapter ) );
1107	adapter = answer.first;
1108	stmtsToAdd.push_back( new DeclStmt( noLabels, newAdapter ) );
1109	} // if
1110	assert( adapter != adapters.end() );
1111
1112	// add the appropriate adapter as a parameter
1113	appExpr->get_args().push_front( new VariableExpr( adapter->second ) );
1114	} // if
1115	} // for
1116	} // passAdapters
1117
1118	Expression makeIncrDecrExpr( ApplicationExpr appExpr, Type *polyType, bool isIncr ) {
1119	NameExpr *opExpr;
1120	if ( isIncr ) {
1121	opExpr = new NameExpr( "?+=?" );
1122	} else {
1123	opExpr = new NameExpr( "?-=?" );
1124	} // if
1125	UntypedExpr *addAssign = new UntypedExpr( opExpr );
1126	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
1127	addAssign->get_args().push_back( address->get_arg() );
1128	} else {
1129	addAssign->get_args().push_back( appExpr->get_args().front() );
1130	} // if
1131	addAssign->get_args().push_back( new NameExpr( sizeofName( mangleType( polyType ) ) ) );
1132	addAssign->get_results().front() = appExpr->get_results().front()->clone();
1133	if ( appExpr->get_env() ) {
1134	addAssign->set_env( appExpr->get_env() );
1135	appExpr->set_env( 0 );
1136	} // if
1137	appExpr->get_args().clear();
1138	delete appExpr;
1139	return addAssign;
1140	}
1141
1142	Expression Pass1::handleIntrinsics( ApplicationExpr appExpr ) {
1143	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( appExpr->get_function() ) ) {
1144	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic ) {
1145	if ( varExpr->get_var()->get_name() == "?[?]" ) {
1146	assert( ! appExpr->get_results().empty() );
1147	assert( appExpr->get_args().size() == 2 );
1148	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
1149	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
1150	assert( ! baseType1 \|\| ! baseType2 ); // the arguments cannot both be polymorphic pointers
1151	UntypedExpr *ret = 0;
1152	if ( baseType1 \|\| baseType2 ) { // one of the arguments is a polymorphic pointer
1153	ret = new UntypedExpr( new NameExpr( "?+?" ) );
1154	} // if
1155	if ( baseType1 ) {
1156	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1157	multiply->get_args().push_back( appExpr->get_args().back() );
1158	multiply->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1159	ret->get_args().push_back( appExpr->get_args().front() );
1160	ret->get_args().push_back( multiply );
1161	} else if ( baseType2 ) {
1162	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1163	multiply->get_args().push_back( appExpr->get_args().front() );
1164	multiply->get_args().push_back( new SizeofExpr( baseType2->clone() ) );
1165	ret->get_args().push_back( multiply );
1166	ret->get_args().push_back( appExpr->get_args().back() );
1167	} // if
1168	if ( baseType1 \|\| baseType2 ) {
1169	ret->get_results().push_front( appExpr->get_results().front()->clone() );
1170	if ( appExpr->get_env() ) {
1171	ret->set_env( appExpr->get_env() );
1172	appExpr->set_env( 0 );
1173	} // if
1174	appExpr->get_args().clear();
1175	delete appExpr;
1176	return ret;
1177	} // if
1178	} else if ( varExpr->get_var()->get_name() == "*?" ) {
1179	assert( ! appExpr->get_results().empty() );
1180	assert( ! appExpr->get_args().empty() );
1181	if ( isPolyType( appExpr->get_results().front(), scopeTyVars, env ) ) {
1182	Expression *ret = appExpr->get_args().front();
1183	delete ret->get_results().front();
1184	ret->get_results().front() = appExpr->get_results().front()->clone();
1185	if ( appExpr->get_env() ) {
1186	ret->set_env( appExpr->get_env() );
1187	appExpr->set_env( 0 );
1188	} // if
1189	appExpr->get_args().clear();
1190	delete appExpr;
1191	return ret;
1192	} // if
1193	} else if ( varExpr->get_var()->get_name() == "?++" \|\| varExpr->get_var()->get_name() == "?--" ) {
1194	assert( ! appExpr->get_results().empty() );
1195	assert( appExpr->get_args().size() == 1 );
1196	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
1197	Type *tempType = appExpr->get_results().front()->clone();
1198	if ( env ) {
1199	env->apply( tempType );
1200	} // if
1201	ObjectDecl *newObj = makeTemporary( tempType );
1202	VariableExpr *tempExpr = new VariableExpr( newObj );
1203	UntypedExpr *assignExpr = new UntypedExpr( new NameExpr( "?=?" ) );
1204	assignExpr->get_args().push_back( tempExpr->clone() );
1205	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
1206	assignExpr->get_args().push_back( address->get_arg()->clone() );
1207	} else {
1208	assignExpr->get_args().push_back( appExpr->get_args().front()->clone() );
1209	} // if
1210	CommaExpr *firstComma = new CommaExpr( assignExpr, makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "?++" ) );
1211	return new CommaExpr( firstComma, tempExpr );
1212	} // if
1213	} else if ( varExpr->get_var()->get_name() == "++?" \|\| varExpr->get_var()->get_name() == "--?" ) {
1214	assert( ! appExpr->get_results().empty() );
1215	assert( appExpr->get_args().size() == 1 );
1216	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
1217	return makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "++?" );
1218	} // if
1219	} else if ( varExpr->get_var()->get_name() == "?+?" \|\| varExpr->get_var()->get_name() == "?-?" ) {
1220	assert( ! appExpr->get_results().empty() );
1221	assert( appExpr->get_args().size() == 2 );
1222	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
1223	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
1224	if ( baseType1 && baseType2 ) {
1225	UntypedExpr *divide = new UntypedExpr( new NameExpr( "?/?" ) );
1226	divide->get_args().push_back( appExpr );
1227	divide->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1228	divide->get_results().push_front( appExpr->get_results().front()->clone() );
1229	if ( appExpr->get_env() ) {
1230	divide->set_env( appExpr->get_env() );
1231	appExpr->set_env( 0 );
1232	} // if
1233	return divide;
1234	} else if ( baseType1 ) {
1235	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1236	multiply->get_args().push_back( appExpr->get_args().back() );
1237	multiply->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1238	appExpr->get_args().back() = multiply;
1239	} else if ( baseType2 ) {
1240	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1241	multiply->get_args().push_back( appExpr->get_args().front() );
1242	multiply->get_args().push_back( new SizeofExpr( baseType2->clone() ) );
1243	appExpr->get_args().front() = multiply;
1244	} // if
1245	} else if ( varExpr->get_var()->get_name() == "?+=?" \|\| varExpr->get_var()->get_name() == "?-=?" ) {
1246	assert( ! appExpr->get_results().empty() );
1247	assert( appExpr->get_args().size() == 2 );
1248	Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env );
1249	if ( baseType ) {
1250	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1251	multiply->get_args().push_back( appExpr->get_args().back() );
1252	multiply->get_args().push_back( new SizeofExpr( baseType->clone() ) );
1253	appExpr->get_args().back() = multiply;
1254	} // if
1255	} // if
1256	return appExpr;
1257	} // if
1258	} // if
1259	return 0;
1260	}
1261
1262	Expression Pass1::mutate( ApplicationExpr appExpr ) {
1263	// std::cerr << "mutate appExpr: ";
1264	// for ( TyVarMap::iterator i = scopeTyVars.begin(); i != scopeTyVars.end(); ++i ) {
1265	// std::cerr << i->first << " ";
1266	// }
1267	// std::cerr << "\n";
1268	bool oldUseRetval = useRetval;
1269	useRetval = false;
1270	appExpr->get_function()->acceptMutator( *this );
1271	mutateAll( appExpr->get_args(), *this );
1272	useRetval = oldUseRetval;
1273
1274	assert( ! appExpr->get_function()->get_results().empty() );
1275	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
1276	assert( pointer );
1277	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
1278	assert( function );
1279
1280	if ( Expression *newExpr = handleIntrinsics( appExpr ) ) {
1281	return newExpr;
1282	} // if
1283
1284	Expression *ret = appExpr;
1285
1286	std::list< Expression *>::iterator arg = appExpr->get_args().begin();
1287	std::list< Expression *>::iterator paramBegin = appExpr->get_args().begin();
1288
1289	TyVarMap exprTyVars( (TypeDecl::Kind)-1 );
1290	makeTyVarMap( function, exprTyVars );
1291	ReferenceToType *polyRetType = isPolyRet( function );
1292
1293	if ( polyRetType ) {
1294	ret = addPolyRetParam( appExpr, function, polyRetType, arg );
1295	} else if ( needsAdapter( function, scopeTyVars ) ) {
1296	// std::cerr << "needs adapter: ";
1297	// printTyVarMap( std::cerr, scopeTyVars );
1298	// std::cerr << *env << std::endl;
1299	// change the application so it calls the adapter rather than the passed function
1300	ret = applyAdapter( appExpr, function, arg, scopeTyVars );
1301	} // if
1302	arg = appExpr->get_args().begin();
1303
1304	passTypeVars( appExpr, polyRetType, arg, exprTyVars );
1305	addInferredParams( appExpr, function, arg, exprTyVars );
1306
1307	arg = paramBegin;
1308
1309	boxParams( appExpr, function, arg, exprTyVars );
1310	passAdapters( appExpr, function, exprTyVars );
1311
1312	return ret;
1313	}
1314
1315	Expression Pass1::mutate( UntypedExpr expr ) {
1316	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
1317	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
1318	if ( name->get_name() == "*?" ) {
1319	Expression *ret = expr->get_args().front();
1320	expr->get_args().clear();
1321	delete expr;
1322	return ret->acceptMutator( *this );
1323	} // if
1324	} // if
1325	} // if
1326	return PolyMutator::mutate( expr );
1327	}
1328
1329	Expression Pass1::mutate( AddressExpr addrExpr ) {
1330	assert( ! addrExpr->get_arg()->get_results().empty() );
1331
1332	bool needs = false;
1333	if ( UntypedExpr expr = dynamic_cast< UntypedExpr >( addrExpr->get_arg() ) ) {
1334	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
1335	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
1336	if ( name->get_name() == "*?" ) {
1337	if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr->get_args().front() ) ) {
1338	assert( ! appExpr->get_function()->get_results().empty() );
1339	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
1340	assert( pointer );
1341	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
1342	assert( function );
1343	needs = needsAdapter( function, scopeTyVars );
1344	} // if
1345	} // if
1346	} // if
1347	} // if
1348	} // if
1349	// isPolyType check needs to happen before mutating addrExpr arg, so pull it forward
1350	// out of the if condition.
1351	bool polytype = isPolyType( addrExpr->get_arg()->get_results().front(), scopeTyVars, env );
1352	addrExpr->set_arg( mutateExpression( addrExpr->get_arg() ) );
1353	if ( polytype \|\| needs ) {
1354	Expression *ret = addrExpr->get_arg();
1355	delete ret->get_results().front();
1356	ret->get_results().front() = addrExpr->get_results().front()->clone();
1357	addrExpr->set_arg( 0 );
1358	delete addrExpr;
1359	return ret;
1360	} else {
1361	return addrExpr;
1362	} // if
1363	}
1364
1365	/// Wraps a function declaration in a new pointer-to-function variable expression
1366	VariableExpr wrapFunctionDecl( DeclarationWithType functionDecl ) {
1367	// line below cloned from FixFunction.cc
1368	ObjectDecl *functionObj = new ObjectDecl( functionDecl->get_name(), functionDecl->get_storageClass(), functionDecl->get_linkage(), 0,
1369	new PointerType( Type::Qualifiers(), functionDecl->get_type()->clone() ), 0 );
1370	functionObj->set_mangleName( functionDecl->get_mangleName() );
1371	return new VariableExpr( functionObj );
1372	}
1373
1374	Statement * Pass1::mutate( ReturnStmt *returnStmt ) {
1375	if ( retval && returnStmt->get_expr() ) {
1376	assert( ! returnStmt->get_expr()->get_results().empty() );
1377	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
1378	// if ( returnStmt->get_expr()->get_results().front()->get_isLvalue() ) {
1379	// by this point, a cast expr on a polymorphic return value is redundant
1380	while ( CastExpr castExpr = dynamic_cast< CastExpr >( returnStmt->get_expr() ) ) {
1381	returnStmt->set_expr( castExpr->get_arg() );
1382	returnStmt->get_expr()->set_env( castExpr->get_env() );
1383	castExpr->set_env( 0 );
1384	castExpr->set_arg( 0 );
1385	delete castExpr;
1386	} //while
1387
1388	// find assignment operator for (polymorphic) return type
1389	ApplicationExpr *assignExpr = 0;
1390	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( retval->get_type() ) ) {
1391	// find assignment operator for type variable
1392	ScopedMap< std::string, DeclarationWithType *>::const_iterator assignIter = assignOps.find( typeInst->get_name() );
1393	if ( assignIter == assignOps.end() ) {
1394	throw SemanticError( "Attempt to return dtype or ftype object in ", returnStmt->get_expr() );
1395	} // if
1396	assignExpr = new ApplicationExpr( new VariableExpr( assignIter->second ) );
1397	} else if ( ReferenceToType refType = dynamic_cast< ReferenceToType >( retval->get_type() ) ) {
1398	// find assignment operator for generic type
1399	DeclarationWithType *functionDecl = scopedAssignOps.find( refType );
1400	if ( ! functionDecl ) {
1401	throw SemanticError( "Attempt to return dtype or ftype generic object in ", returnStmt->get_expr() );
1402	}
1403
1404	// wrap it up in an application expression
1405	assignExpr = new ApplicationExpr( wrapFunctionDecl( functionDecl ) );
1406	assignExpr->set_env( env->clone() );
1407
1408	// find each of its needed secondary assignment operators
1409	std::list< Expression* > &tyParams = refType->get_parameters();
1410	std::list< TypeDecl* > &forallParams = functionDecl->get_type()->get_forall();
1411	std::list< Expression* >::const_iterator tyIt = tyParams.begin();
1412	std::list< TypeDecl* >::const_iterator forallIt = forallParams.begin();
1413	for ( ; tyIt != tyParams.end() && forallIt != forallParams.end(); ++tyIt, ++forallIt ) {
1414	// Add appropriate mapping to assignment expression environment
1415	TypeExpr formalTypeExpr = dynamic_cast< TypeExpr >( *tyIt );
1416	assert( formalTypeExpr && "type parameters must be type expressions" );
1417	Type *formalType = formalTypeExpr->get_type();
1418	assignExpr->get_env()->add( (*forallIt)->get_name(), formalType );
1419
1420	// skip types with no assign op (ftype/dtype)
1421	if ( (*forallIt)->get_kind() != TypeDecl::Any ) continue;
1422
1423	// find assignment operator for formal type
1424	DeclarationWithType *assertAssign = 0;
1425	if ( TypeInstType formalTypeInstType = dynamic_cast< TypeInstType >( formalType ) ) {
1426	ScopedMap< std::string, DeclarationWithType *>::const_iterator assertAssignIt = assignOps.find( formalTypeInstType->get_name() );
1427	if ( assertAssignIt == assignOps.end() ) {
1428	throw SemanticError( "No assignment operation found for ", formalTypeInstType );
1429	}
1430	assertAssign = assertAssignIt->second;
1431	} else {
1432	assertAssign = scopedAssignOps.find( formalType );
1433	if ( ! assertAssign ) {
1434	throw SemanticError( "No assignment operation found for ", formalType );
1435	}
1436	}
1437
1438	// add inferred parameter for field assignment operator to assignment expression
1439	std::list< DeclarationWithType* > &asserts = (*forallIt)->get_assertions();
1440	assert( ! asserts.empty() && "Type param needs assignment operator assertion" );
1441	DeclarationWithType *actualDecl = asserts.front();
1442	assignExpr->get_inferParams()[ actualDecl->get_uniqueId() ]
1443	= ParamEntry( assertAssign->get_uniqueId(), assertAssign->get_type()->clone(), actualDecl->get_type()->clone(), wrapFunctionDecl( assertAssign ) );
1444	}
1445	}
1446	assert( assignExpr );
1447
1448	// replace return statement with appropriate assignment to out parameter
1449	Expression *retParm = new NameExpr( retval->get_name() );
1450	retParm->get_results().push_back( new PointerType( Type::Qualifiers(), retval->get_type()->clone() ) );
1451	assignExpr->get_args().push_back( retParm );
1452	assignExpr->get_args().push_back( returnStmt->get_expr() );
1453	stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( assignExpr ) ) );
1454	// } else {
1455	// useRetval = true;
1456	// stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( returnStmt->get_expr() ) ) );
1457	// useRetval = false;
1458	// } // if
1459	returnStmt->set_expr( 0 );
1460	} else {
1461	returnStmt->set_expr( mutateExpression( returnStmt->get_expr() ) );
1462	} // if
1463	return returnStmt;
1464	}
1465
1466	Type * Pass1::mutate( PointerType *pointerType ) {
1467	scopeTyVars.beginScope();
1468	makeTyVarMap( pointerType, scopeTyVars );
1469
1470	Type *ret = Mutator::mutate( pointerType );
1471
1472	scopeTyVars.endScope();
1473	return ret;
1474	}
1475
1476	Type * Pass1::mutate( FunctionType *functionType ) {
1477	scopeTyVars.beginScope();
1478	makeTyVarMap( functionType, scopeTyVars );
1479
1480	Type *ret = Mutator::mutate( functionType );
1481
1482	scopeTyVars.endScope();
1483	return ret;
1484	}
1485
1486	void Pass1::doBeginScope() {
1487	adapters.beginScope();
1488	scopedAssignOps.beginScope();
1489	}
1490
1491	void Pass1::doEndScope() {
1492	adapters.endScope();
1493	scopedAssignOps.endScope();
1494	}
1495
1496	////////////////////////////////////////// Pass2 ////////////////////////////////////////////////////
1497
1498	void Pass2::addAdapters( FunctionType *functionType ) {
1499	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
1500	std::list< FunctionType *> functions;
1501	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
1502	Type orig = (arg)->get_type();
1503	findAndReplaceFunction( orig, functions, scopeTyVars, needsAdapter );
1504	(*arg)->set_type( orig );
1505	}
1506	std::set< std::string > adaptersDone;
1507	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
1508	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
1509	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
1510	std::string adapterName = makeAdapterName( mangleName );
1511	paramList.push_front( new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( *funType, scopeTyVars ) ), 0 ) );
1512	adaptersDone.insert( adaptersDone.begin(), mangleName );
1513	}
1514	}
1515	// deleteAll( functions );
1516	}
1517
1518	template< typename DeclClass >
1519	DeclClass * Pass2::handleDecl( DeclClass decl, Type type ) {
1520	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
1521
1522	return ret;
1523	}
1524
1525	DeclarationWithType * Pass2::mutate( FunctionDecl *functionDecl ) {
1526	return handleDecl( functionDecl, functionDecl->get_functionType() );
1527	}
1528
1529	ObjectDecl * Pass2::mutate( ObjectDecl *objectDecl ) {
1530	return handleDecl( objectDecl, objectDecl->get_type() );
1531	}
1532
1533	TypeDecl * Pass2::mutate( TypeDecl *typeDecl ) {
1534	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1535	if ( typeDecl->get_base() ) {
1536	return handleDecl( typeDecl, typeDecl->get_base() );
1537	} else {
1538	return Mutator::mutate( typeDecl );
1539	}
1540	}
1541
1542	TypedefDecl * Pass2::mutate( TypedefDecl *typedefDecl ) {
1543	return handleDecl( typedefDecl, typedefDecl->get_base() );
1544	}
1545
1546	Type * Pass2::mutate( PointerType *pointerType ) {
1547	scopeTyVars.beginScope();
1548	makeTyVarMap( pointerType, scopeTyVars );
1549
1550	Type *ret = Mutator::mutate( pointerType );
1551
1552	scopeTyVars.endScope();
1553	return ret;
1554	}
1555
1556	Type Pass2::mutate( FunctionType funcType ) {
1557	scopeTyVars.beginScope();
1558	makeTyVarMap( funcType, scopeTyVars );
1559
1560	// move polymorphic return type to parameter list
1561	if ( isPolyRet( funcType ) ) {
1562	DeclarationWithType *ret = funcType->get_returnVals().front();
1563	ret->set_type( new PointerType( Type::Qualifiers(), ret->get_type() ) );
1564	funcType->get_parameters().push_front( ret );
1565	funcType->get_returnVals().pop_front();
1566	}
1567
1568	// add size/align and assertions for type parameters to parameter list
1569	std::list< DeclarationWithType *>::iterator last = funcType->get_parameters().begin();
1570	std::list< DeclarationWithType *> inferredParams;
1571	ObjectDecl newObj( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), 0 );
1572	ObjectDecl newPtr( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0,
1573	new PointerType( Type::Qualifiers(), new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) ), 0 );
1574	for ( std::list< TypeDecl *>::const_iterator tyParm = funcType->get_forall().begin(); tyParm != funcType->get_forall().end(); ++tyParm ) {
1575	ObjectDecl sizeParm, alignParm;
1576	// add all size and alignment parameters to parameter list
1577	if ( (*tyParm)->get_kind() == TypeDecl::Any ) {
1578	TypeInstType parmType( Type::Qualifiers(), (tyParm)->get_name(), tyParm );
1579	std::string parmName = mangleType( &parmType );
1580
1581	sizeParm = newObj.clone();
1582	sizeParm->set_name( sizeofName( parmName ) );
1583	last = funcType->get_parameters().insert( last, sizeParm );
1584	++last;
1585
1586	alignParm = newObj.clone();
1587	alignParm->set_name( alignofName( parmName ) );
1588	last = funcType->get_parameters().insert( last, alignParm );
1589	++last;
1590	}
1591	// move all assertions into parameter list
1592	for ( std::list< DeclarationWithType >::iterator assert = (tyParm)->get_assertions().begin(); assert != (*tyParm)->get_assertions().end(); ++assert ) {
1593	// assert = (assert)->acceptMutator( *this );
1594	inferredParams.push_back( *assert );
1595	}
1596	(*tyParm)->get_assertions().clear();
1597	}
1598
1599	// add size/align for generic parameter types to parameter list
1600	std::set< std::string > seenTypes; // sizeofName for generic types we've seen
1601	for ( std::list< DeclarationWithType* >::const_iterator fnParm = last; fnParm != funcType->get_parameters().end(); ++fnParm ) {
1602	Type polyType = isPolyType( (fnParm)->get_type(), scopeTyVars );
1603	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
1604	std::string typeName = mangleType( polyType );
1605	if ( seenTypes.count( typeName ) ) continue;
1606
1607	ObjectDecl sizeParm, alignParm, *offsetParm;
1608	sizeParm = newObj.clone();
1609	sizeParm->set_name( sizeofName( typeName ) );
1610	last = funcType->get_parameters().insert( last, sizeParm );
1611	++last;
1612
1613	alignParm = newObj.clone();
1614	alignParm->set_name( alignofName( typeName ) );
1615	last = funcType->get_parameters().insert( last, alignParm );
1616	++last;
1617
1618	if ( StructInstType polyBaseStruct = dynamic_cast< StructInstType >( polyType ) ) {
1619	// NOTE zero-length arrays are illegal in C, so empty structs have no offset array
1620	if ( ! polyBaseStruct->get_baseStruct()->get_members().empty() ) {
1621	offsetParm = newPtr.clone();
1622	offsetParm->set_name( offsetofName( typeName ) );
1623	last = funcType->get_parameters().insert( last, offsetParm );
1624	++last;
1625	}
1626	}
1627
1628	seenTypes.insert( typeName );
1629	}
1630	}
1631
1632	// splice assertion parameters into parameter list
1633	funcType->get_parameters().splice( last, inferredParams );
1634	addAdapters( funcType );
1635	mutateAll( funcType->get_returnVals(), *this );
1636	mutateAll( funcType->get_parameters(), *this );
1637
1638	scopeTyVars.endScope();
1639	return funcType;
1640	}
1641
1642	//////////////////////////////////////// GenericInstantiator //////////////////////////////////////////////////
1643
1644	/// Makes substitutions of params into baseParams; returns true if all parameters substituted for a concrete type
1645	bool makeSubstitutions( const std::list< TypeDecl* >& baseParams, const std::list< Expression* >& params, std::list< TypeExpr* >& out ) {
1646	bool allConcrete = true; // will finish the substitution list even if they're not all concrete
1647
1648	// substitute concrete types for given parameters, and incomplete types for placeholders
1649	std::list< TypeDecl* >::const_iterator baseParam = baseParams.begin();
1650	std::list< Expression* >::const_iterator param = params.begin();
1651	for ( ; baseParam != baseParams.end() && param != params.end(); ++baseParam, ++param ) {
1652	// switch ( (*baseParam)->get_kind() ) {
1653	// case TypeDecl::Any: { // any type is a valid substitution here; complete types can be used to instantiate generics
1654	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
1655	assert(paramType && "Aggregate parameters should be type expressions");
1656	out.push_back( paramType->clone() );
1657	// check that the substituted type isn't a type variable itself
1658	if ( dynamic_cast< TypeInstType* >( paramType->get_type() ) ) {
1659	allConcrete = false;
1660	}
1661	// break;
1662	// }
1663	// case TypeDecl::Dtype: // dtype can be consistently replaced with void [only pointers, which become void*]
1664	// out.push_back( new TypeExpr( new VoidType( Type::Qualifiers() ) ) );
1665	// break;
1666	// case TypeDecl::Ftype: // pointer-to-ftype can be consistently replaced with void (*)(void) [similar to dtype]
1667	// out.push_back( new TypeExpr( new FunctionType( Type::Qualifiers(), false ) ) );
1668	// break;
1669	// }
1670	}
1671
1672	// if any parameters left over, not done
1673	if ( baseParam != baseParams.end() ) return false;
1674	// // if not enough parameters given, substitute remaining incomplete types for placeholders
1675	// for ( ; baseParam != baseParams.end(); ++baseParam ) {
1676	// switch ( (*baseParam)->get_kind() ) {
1677	// case TypeDecl::Any: // no more substitutions here, fail early
1678	// return false;
1679	// case TypeDecl::Dtype: // dtype can be consistently replaced with void [only pointers, which become void*]
1680	// out.push_back( new TypeExpr( new VoidType( Type::Qualifiers() ) ) );
1681	// break;
1682	// case TypeDecl::Ftype: // pointer-to-ftype can be consistently replaced with void (*)(void) [similar to dtype]
1683	// out.push_back( new TypeExpr( new FunctionType( Type::Qualifiers(), false ) ) );
1684	// break;
1685	// }
1686	// }
1687
1688	return allConcrete;
1689	}
1690
1691	/// Substitutes types of members of in according to baseParams => typeSubs, appending the result to out
1692	void substituteMembers( const std::list< Declaration* >& in, const std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs,
1693	std::list< Declaration* >& out ) {
1694	// substitute types into new members
1695	TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
1696	for ( std::list< Declaration* >::const_iterator member = in.begin(); member != in.end(); ++member ) {
1697	Declaration newMember = (member)->clone();
1698	subs.apply(newMember);
1699	out.push_back( newMember );
1700	}
1701	}
1702
1703	Type* GenericInstantiator::mutate( StructInstType *inst ) {
1704	// mutate subtypes
1705	Type *mutated = Mutator::mutate( inst );
1706	inst = dynamic_cast< StructInstType* >( mutated );
1707	if ( ! inst ) return mutated;
1708
1709	// exit early if no need for further mutation
1710	if ( inst->get_parameters().empty() ) return inst;
1711	assert( inst->get_baseParameters() && "Base struct has parameters" );
1712
1713	// check if type can be concretely instantiated; put substitutions into typeSubs
1714	std::list< TypeExpr* > typeSubs;
1715	if ( ! makeSubstitutions( *inst->get_baseParameters(), inst->get_parameters(), typeSubs ) ) {
1716	deleteAll( typeSubs );
1717	return inst;
1718	}
1719
1720	// make concrete instantiation of generic type
1721	StructDecl *concDecl = lookup( inst, typeSubs );
1722	if ( ! concDecl ) {
1723	// set concDecl to new type, insert type declaration into statements to add
1724	concDecl = new StructDecl( typeNamer.newName( inst->get_name() ) );
1725	substituteMembers( inst->get_baseStruct()->get_members(), *inst->get_baseParameters(), typeSubs, concDecl->get_members() );
1726	DeclMutator::addDeclaration( concDecl );
1727	insert( inst, typeSubs, concDecl );
1728	}
1729	StructInstType *newInst = new StructInstType( inst->get_qualifiers(), concDecl->get_name() );
1730	newInst->set_baseStruct( concDecl );
1731
1732	deleteAll( typeSubs );
1733	delete inst;
1734	return newInst;
1735	}
1736
1737	Type* GenericInstantiator::mutate( UnionInstType *inst ) {
1738	// mutate subtypes
1739	Type *mutated = Mutator::mutate( inst );
1740	inst = dynamic_cast< UnionInstType* >( mutated );
1741	if ( ! inst ) return mutated;
1742
1743	// exit early if no need for further mutation
1744	if ( inst->get_parameters().empty() ) return inst;
1745	assert( inst->get_baseParameters() && "Base union has parameters" );
1746
1747	// check if type can be concretely instantiated; put substitutions into typeSubs
1748	std::list< TypeExpr* > typeSubs;
1749	if ( ! makeSubstitutions( *inst->get_baseParameters(), inst->get_parameters(), typeSubs ) ) {
1750	deleteAll( typeSubs );
1751	return inst;
1752	}
1753
1754	// make concrete instantiation of generic type
1755	UnionDecl *concDecl = lookup( inst, typeSubs );
1756	if ( ! concDecl ) {
1757	// set concDecl to new type, insert type declaration into statements to add
1758	concDecl = new UnionDecl( typeNamer.newName( inst->get_name() ) );
1759	substituteMembers( inst->get_baseUnion()->get_members(), *inst->get_baseParameters(), typeSubs, concDecl->get_members() );
1760	DeclMutator::addDeclaration( concDecl );
1761	insert( inst, typeSubs, concDecl );
1762	}
1763	UnionInstType *newInst = new UnionInstType( inst->get_qualifiers(), concDecl->get_name() );
1764	newInst->set_baseUnion( concDecl );
1765
1766	deleteAll( typeSubs );
1767	delete inst;
1768	return newInst;
1769	}
1770
1771	// /// Gets the base struct or union declaration for a member expression; NULL if not applicable
1772	// AggregateDecl* getMemberBaseDecl( MemberExpr *memberExpr ) {
1773	// // get variable for member aggregate
1774	// VariableExpr varExpr = dynamic_cast< VariableExpr >( memberExpr->get_aggregate() );
1775	// if ( ! varExpr ) return NULL;
1776	//
1777	// // get object for variable
1778	// ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( varExpr->get_var() );
1779	// if ( ! objectDecl ) return NULL;
1780	//
1781	// // get base declaration from object type
1782	// Type *objectType = objectDecl->get_type();
1783	// StructInstType structType = dynamic_cast< StructInstType >( objectType );
1784	// if ( structType ) return structType->get_baseStruct();
1785	// UnionInstType unionType = dynamic_cast< UnionInstType >( objectType );
1786	// if ( unionType ) return unionType->get_baseUnion();
1787	//
1788	// return NULL;
1789	// }
1790	//
1791	// /// Finds the declaration with the given name, returning decls.end() if none such
1792	// std::list< Declaration* >::const_iterator findDeclNamed( const std::list< Declaration* > &decls, const std::string &name ) {
1793	// for( std::list< Declaration* >::const_iterator decl = decls.begin(); decl != decls.end(); ++decl ) {
1794	// if ( (*decl)->get_name() == name ) return decl;
1795	// }
1796	// return decls.end();
1797	// }
1798	//
1799	// Expression* Instantiate::mutate( MemberExpr *memberExpr ) {
1800	// // mutate, exiting early if no longer MemberExpr
1801	// Expression *expr = Mutator::mutate( memberExpr );
1802	// memberExpr = dynamic_cast< MemberExpr* >( expr );
1803	// if ( ! memberExpr ) return expr;
1804	//
1805	// // get declaration of member and base declaration of member, exiting early if not found
1806	// AggregateDecl *memberBase = getMemberBaseDecl( memberExpr );
1807	// if ( ! memberBase ) return memberExpr;
1808	// DeclarationWithType *memberDecl = memberExpr->get_member();
1809	// std::list< Declaration* >::const_iterator baseIt = findDeclNamed( memberBase->get_members(), memberDecl->get_name() );
1810	// if ( baseIt == memberBase->get_members().end() ) return memberExpr;
1811	// DeclarationWithType baseDecl = dynamic_cast< DeclarationWithType >( *baseIt );
1812	// if ( ! baseDecl ) return memberExpr;
1813	//
1814	// // check if stated type of the member is not the type of the member's declaration; if so, need a cast
1815	// // this SHOULD be safe, I don't think anything but the void-replacements I put in for dtypes would make it past the typechecker
1816	// SymTab::Indexer dummy;
1817	// if ( ResolvExpr::typesCompatible( memberDecl->get_type(), baseDecl->get_type(), dummy ) ) return memberExpr;
1818	// else return new CastExpr( memberExpr, memberDecl->get_type() );
1819	// }
1820
1821	void GenericInstantiator::doBeginScope() {
1822	DeclMutator::doBeginScope();
1823	instantiations.beginScope();
1824	}
1825
1826	void GenericInstantiator::doEndScope() {
1827	DeclMutator::doEndScope();
1828	instantiations.endScope();
1829	}
1830
1831	////////////////////////////////////////// PolyGenericCalculator ////////////////////////////////////////////////////
1832
1833	void PolyGenericCalculator::beginTypeScope( Type *ty ) {
1834	scopeTyVars.beginScope();
1835	makeTyVarMap( ty, scopeTyVars );
1836	}
1837
1838	void PolyGenericCalculator::endTypeScope() {
1839	scopeTyVars.endScope();
1840	}
1841
1842	template< typename DeclClass >
1843	DeclClass * PolyGenericCalculator::handleDecl( DeclClass decl, Type type ) {
1844	beginTypeScope( type );
1845	knownLayouts.beginScope();
1846	knownOffsets.beginScope();
1847
1848	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
1849
1850	knownOffsets.endScope();
1851	knownLayouts.endScope();
1852	endTypeScope();
1853	return ret;
1854	}
1855
1856	ObjectDecl * PolyGenericCalculator::mutate( ObjectDecl *objectDecl ) {
1857	return handleDecl( objectDecl, objectDecl->get_type() );
1858	}
1859
1860	DeclarationWithType * PolyGenericCalculator::mutate( FunctionDecl *functionDecl ) {
1861	return handleDecl( functionDecl, functionDecl->get_functionType() );
1862	}
1863
1864	TypedefDecl * PolyGenericCalculator::mutate( TypedefDecl *typedefDecl ) {
1865	return handleDecl( typedefDecl, typedefDecl->get_base() );
1866	}
1867
1868	TypeDecl * PolyGenericCalculator::mutate( TypeDecl *typeDecl ) {
1869	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1870	return Mutator::mutate( typeDecl );
1871	}
1872
1873	Type * PolyGenericCalculator::mutate( PointerType *pointerType ) {
1874	beginTypeScope( pointerType );
1875
1876	Type *ret = Mutator::mutate( pointerType );
1877
1878	endTypeScope();
1879	return ret;
1880	}
1881
1882	Type * PolyGenericCalculator::mutate( FunctionType *funcType ) {
1883	beginTypeScope( funcType );
1884
1885	// make sure that any type information passed into the function is accounted for
1886	for ( std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin(); fnParm != funcType->get_parameters().end(); ++fnParm ) {
1887	// condition here duplicates that in Pass2::mutate( FunctionType* )
1888	Type polyType = isPolyType( (fnParm)->get_type(), scopeTyVars );
1889	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
1890	knownLayouts.insert( mangleType( polyType ) );
1891	}
1892	}
1893
1894	Type *ret = Mutator::mutate( funcType );
1895
1896	endTypeScope();
1897	return ret;
1898	}
1899
1900	Statement PolyGenericCalculator::mutate( DeclStmt declStmt ) {
1901	if ( ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( declStmt->get_decl() ) ) {
1902	if ( findGeneric( objectDecl->get_type() ) ) {
1903	// change initialization of a polymorphic value object
1904	// to allocate storage with alloca
1905	Type *declType = objectDecl->get_type();
1906	UntypedExpr *alloc = new UntypedExpr( new NameExpr( "__builtin_alloca" ) );
1907	alloc->get_args().push_back( new NameExpr( sizeofName( mangleType( declType ) ) ) );
1908
1909	delete objectDecl->get_init();
1910
1911	std::list<Expression*> designators;
1912	objectDecl->set_init( new SingleInit( alloc, designators, false ) ); // not constructed
1913	}
1914	}
1915	return Mutator::mutate( declStmt );
1916	}
1917
1918	/// Finds the member in the base list that matches the given declaration; returns its index, or -1 if not present
1919	long findMember( DeclarationWithType memberDecl, std::list< Declaration > &baseDecls ) {
1920	long i = 0;
1921	for(std::list< Declaration* >::const_iterator decl = baseDecls.begin(); decl != baseDecls.end(); ++decl, ++i ) {
1922	if ( memberDecl->get_name() != (*decl)->get_name() ) continue;
1923
1924	if ( DeclarationWithType declWithType = dynamic_cast< DeclarationWithType >( *decl ) ) {
1925	if ( memberDecl->get_mangleName().empty() \|\| declWithType->get_mangleName().empty()
1926	\|\| memberDecl->get_mangleName() == declWithType->get_mangleName() ) return i;
1927	else continue;
1928	} else return i;
1929	}
1930	return -1;
1931	}
1932
1933	/// Returns an index expression into the offset array for a type
1934	Expression makeOffsetIndex( Type objectType, long i ) {
1935	std::stringstream offset_namer;
1936	offset_namer << i;
1937	ConstantExpr *fieldIndex = new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), offset_namer.str() ) );
1938	UntypedExpr *fieldOffset = new UntypedExpr( new NameExpr( "?[?]" ) );
1939	fieldOffset->get_args().push_back( new NameExpr( offsetofName( mangleType( objectType ) ) ) );
1940	fieldOffset->get_args().push_back( fieldIndex );
1941	return fieldOffset;
1942	}
1943
1944	/// Returns an expression dereferenced n times
1945	Expression makeDerefdVar( Expression derefdVar, long n ) {
1946	for ( int i = 1; i < n; ++i ) {
1947	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
1948	derefExpr->get_args().push_back( derefdVar );
1949	// xxx - should set results on derefExpr
1950	derefdVar = derefExpr;
1951	}
1952	return derefdVar;
1953	}
1954
1955	Expression PolyGenericCalculator::mutate( MemberExpr memberExpr ) {
1956	// mutate, exiting early if no longer MemberExpr
1957	Expression *expr = Mutator::mutate( memberExpr );
1958	memberExpr = dynamic_cast< MemberExpr* >( expr );
1959	if ( ! memberExpr ) return expr;
1960
1961	// get declaration for base struct, exiting early if not found
1962	int varDepth;
1963	VariableExpr *varExpr = getBaseVar( memberExpr->get_aggregate(), &varDepth );
1964	if ( ! varExpr ) return memberExpr;
1965	ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( varExpr->get_var() );
1966	if ( ! objectDecl ) return memberExpr;
1967
1968	// only mutate member expressions for polymorphic types
1969	int tyDepth;
1970	Type *objectType = hasPolyBase( objectDecl->get_type(), scopeTyVars, &tyDepth );
1971	if ( ! objectType ) return memberExpr;
1972	findGeneric( objectType ); // ensure layout for this type is available
1973
1974	Expression *newMemberExpr = 0;
1975	if ( StructInstType structType = dynamic_cast< StructInstType >( objectType ) ) {
1976	// look up offset index
1977	long i = findMember( memberExpr->get_member(), structType->get_baseStruct()->get_members() );
1978	if ( i == -1 ) return memberExpr;
1979
1980	// replace member expression with pointer to base plus offset
1981	UntypedExpr *fieldLoc = new UntypedExpr( new NameExpr( "?+?" ) );
1982	fieldLoc->get_args().push_back( makeDerefdVar( varExpr->clone(), varDepth ) );
1983	fieldLoc->get_args().push_back( makeOffsetIndex( objectType, i ) );
1984	newMemberExpr = fieldLoc;
1985	} else if ( dynamic_cast< UnionInstType* >( objectType ) ) {
1986	// union members are all at offset zero, so build appropriately-dereferenced variable
1987	newMemberExpr = makeDerefdVar( varExpr->clone(), varDepth );
1988	} else return memberExpr;
1989	assert( newMemberExpr );
1990
1991	Type *memberType = memberExpr->get_member()->get_type();
1992	if ( ! isPolyType( memberType, scopeTyVars ) ) {
1993	// 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
1994	CastExpr *ptrCastExpr = new CastExpr( newMemberExpr, new PointerType( Type::Qualifiers(), memberType->clone() ) );
1995	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
1996	derefExpr->get_args().push_back( ptrCastExpr );
1997	newMemberExpr = derefExpr;
1998	}
1999
2000	delete memberExpr;
2001	return newMemberExpr;
2002	}
2003
2004	ObjectDecl PolyGenericCalculator::makeVar( const std::string &name, Type type, Initializer *init ) {
2005	ObjectDecl *newObj = new ObjectDecl( name, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, init );
2006	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
2007	return newObj;
2008	}
2009
2010	void PolyGenericCalculator::addOtypeParamsToLayoutCall( UntypedExpr layoutCall, const std::list< Type > &otypeParams ) {
2011	for ( std::list< Type* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
2012	if ( findGeneric( *param ) ) {
2013	// push size/align vars for a generic parameter back
2014	std::string paramName = mangleType( *param );
2015	layoutCall->get_args().push_back( new NameExpr( sizeofName( paramName ) ) );
2016	layoutCall->get_args().push_back( new NameExpr( alignofName( paramName ) ) );
2017	} else {
2018	layoutCall->get_args().push_back( new SizeofExpr( (*param)->clone() ) );
2019	layoutCall->get_args().push_back( new AlignofExpr( (*param)->clone() ) );
2020	}
2021	}
2022	}
2023
2024	/// returns true if any of the otype parameters have a dynamic layout and puts all otype parameters in the output list
2025	bool findGenericParams( std::list< TypeDecl* > &baseParams, std::list< Expression* > &typeParams, std::list< Type* > &out ) {
2026	bool hasDynamicLayout = false;
2027
2028	std::list< TypeDecl* >::const_iterator baseParam = baseParams.begin();
2029	std::list< Expression* >::const_iterator typeParam = typeParams.begin();
2030	for ( ; baseParam != baseParams.end() && typeParam != typeParams.end(); ++baseParam, ++typeParam ) {
2031	// skip non-otype parameters
2032	if ( (*baseParam)->get_kind() != TypeDecl::Any ) continue;
2033	TypeExpr typeExpr = dynamic_cast< TypeExpr >( *typeParam );
2034	assert( typeExpr && "all otype parameters should be type expressions" );
2035
2036	Type *type = typeExpr->get_type();
2037	out.push_back( type );
2038	if ( isPolyType( type ) ) hasDynamicLayout = true;
2039	}
2040	assert( baseParam == baseParams.end() && typeParam == typeParams.end() );
2041
2042	return hasDynamicLayout;
2043	}
2044
2045	bool PolyGenericCalculator::findGeneric( Type *ty ) {
2046	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( ty ) ) {
2047	// duplicate logic from isPolyType()
2048	if ( env ) {
2049	if ( Type *newType = env->lookup( typeInst->get_name() ) ) {
2050	return findGeneric( newType );
2051	} // if
2052	} // if
2053	if ( scopeTyVars.find( typeInst->get_name() ) != scopeTyVars.end() ) {
2054	// NOTE assumes here that getting put in the scopeTyVars included having the layout variables set
2055	return true;
2056	}
2057	return false;
2058	} else if ( StructInstType structTy = dynamic_cast< StructInstType >( ty ) ) {
2059	// check if this type already has a layout generated for it
2060	std::string typeName = mangleType( ty );
2061	if ( knownLayouts.find( typeName ) != knownLayouts.end() ) return true;
2062
2063	// check if any of the type parameters have dynamic layout; if none do, this type is (or will be) monomorphized
2064	std::list< Type* > otypeParams;
2065	if ( ! findGenericParams( *structTy->get_baseParameters(), structTy->get_parameters(), otypeParams ) ) return false;
2066
2067	// insert local variables for layout and generate call to layout function
2068	knownLayouts.insert( typeName ); // done early so as not to interfere with the later addition of parameters to the layout call
2069	Type *layoutType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
2070
2071	int n_members = structTy->get_baseStruct()->get_members().size();
2072	if ( n_members == 0 ) {
2073	// all empty structs have the same layout - size 1, align 1
2074	makeVar( sizeofName( typeName ), layoutType, new SingleInit( new ConstantExpr( Constant::from_ulong( (unsigned long)1 ) ) ) );
2075	makeVar( alignofName( typeName ), layoutType->clone(), new SingleInit( new ConstantExpr( Constant::from_ulong( (unsigned long)1 ) ) ) );
2076	// NOTE zero-length arrays are forbidden in C, so empty structs have no offsetof array
2077	} else {
2078	ObjectDecl *sizeVar = makeVar( sizeofName( typeName ), layoutType );
2079	ObjectDecl *alignVar = makeVar( alignofName( typeName ), layoutType->clone() );
2080	ObjectDecl *offsetVar = makeVar( offsetofName( typeName ), new ArrayType( Type::Qualifiers(), layoutType->clone(), new ConstantExpr( Constant::from_int( n_members ) ), false, false ) );
2081
2082	// generate call to layout function
2083	UntypedExpr *layoutCall = new UntypedExpr( new NameExpr( layoutofName( structTy->get_baseStruct() ) ) );
2084	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( sizeVar ) ) );
2085	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( alignVar ) ) );
2086	layoutCall->get_args().push_back( new VariableExpr( offsetVar ) );
2087	addOtypeParamsToLayoutCall( layoutCall, otypeParams );
2088
2089	stmtsToAdd.push_back( new ExprStmt( noLabels, layoutCall ) );
2090	}
2091
2092	return true;
2093	} else if ( UnionInstType unionTy = dynamic_cast< UnionInstType >( ty ) ) {
2094	// check if this type already has a layout generated for it
2095	std::string typeName = mangleType( ty );
2096	if ( knownLayouts.find( typeName ) != knownLayouts.end() ) return true;
2097
2098	// check if any of the type parameters have dynamic layout; if none do, this type is (or will be) monomorphized
2099	std::list< Type* > otypeParams;
2100	if ( ! findGenericParams( *unionTy->get_baseParameters(), unionTy->get_parameters(), otypeParams ) ) return false;
2101
2102	// insert local variables for layout and generate call to layout function
2103	knownLayouts.insert( typeName ); // done early so as not to interfere with the later addition of parameters to the layout call
2104	Type *layoutType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
2105
2106	ObjectDecl *sizeVar = makeVar( sizeofName( typeName ), layoutType );
2107	ObjectDecl *alignVar = makeVar( alignofName( typeName ), layoutType->clone() );
2108
2109	// generate call to layout function
2110	UntypedExpr *layoutCall = new UntypedExpr( new NameExpr( layoutofName( unionTy->get_baseUnion() ) ) );
2111	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( sizeVar ) ) );
2112	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( alignVar ) ) );
2113	addOtypeParamsToLayoutCall( layoutCall, otypeParams );
2114
2115	stmtsToAdd.push_back( new ExprStmt( noLabels, layoutCall ) );
2116
2117	return true;
2118	}
2119
2120	return false;
2121	}
2122
2123	Expression PolyGenericCalculator::mutate( SizeofExpr sizeofExpr ) {
2124	Type *ty = sizeofExpr->get_type();
2125	if ( findGeneric( ty ) ) {
2126	Expression *ret = new NameExpr( sizeofName( mangleType( ty ) ) );
2127	delete sizeofExpr;
2128	return ret;
2129	}
2130	return sizeofExpr;
2131	}
2132
2133	Expression PolyGenericCalculator::mutate( AlignofExpr alignofExpr ) {
2134	Type *ty = alignofExpr->get_type();
2135	if ( findGeneric( ty ) ) {
2136	Expression *ret = new NameExpr( alignofName( mangleType( ty ) ) );
2137	delete alignofExpr;
2138	return ret;
2139	}
2140	return alignofExpr;
2141	}
2142
2143	Expression PolyGenericCalculator::mutate( OffsetofExpr offsetofExpr ) {
2144	// mutate, exiting early if no longer OffsetofExpr
2145	Expression *expr = Mutator::mutate( offsetofExpr );
2146	offsetofExpr = dynamic_cast< OffsetofExpr* >( expr );
2147	if ( ! offsetofExpr ) return expr;
2148
2149	// only mutate expressions for polymorphic structs/unions
2150	Type *ty = offsetofExpr->get_type();
2151	if ( ! findGeneric( ty ) ) return offsetofExpr;
2152
2153	if ( StructInstType structType = dynamic_cast< StructInstType >( ty ) ) {
2154	// replace offsetof expression by index into offset array
2155	long i = findMember( offsetofExpr->get_member(), structType->get_baseStruct()->get_members() );
2156	if ( i == -1 ) return offsetofExpr;
2157
2158	Expression *offsetInd = makeOffsetIndex( ty, i );
2159	delete offsetofExpr;
2160	return offsetInd;
2161	} else if ( dynamic_cast< UnionInstType* >( ty ) ) {
2162	// all union members are at offset zero
2163	delete offsetofExpr;
2164	return new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), std::string("0") ) );
2165	} else return offsetofExpr;
2166	}
2167
2168	Expression PolyGenericCalculator::mutate( OffsetPackExpr offsetPackExpr ) {
2169	StructInstType *ty = offsetPackExpr->get_type();
2170
2171	Expression *ret = 0;
2172	if ( findGeneric( ty ) ) {
2173	// pull offset back from generated type information
2174	ret = new NameExpr( offsetofName( mangleType( ty ) ) );
2175	} else {
2176	std::string offsetName = offsetofName( mangleType( ty ) );
2177	if ( knownOffsets.find( offsetName ) != knownOffsets.end() ) {
2178	// use the already-generated offsets for this type
2179	ret = new NameExpr( offsetName );
2180	} else {
2181	knownOffsets.insert( offsetName );
2182
2183	std::list< Declaration* > &baseMembers = ty->get_baseStruct()->get_members();
2184	Type *offsetType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
2185
2186	// build initializer list for offset array
2187	std::list< Initializer* > inits;
2188	for ( std::list< Declaration* >::const_iterator member = baseMembers.begin(); member != baseMembers.end(); ++member ) {
2189	DeclarationWithType *memberDecl;
2190	if ( DeclarationWithType origMember = dynamic_cast< DeclarationWithType >( *member ) ) {
2191	memberDecl = origMember->clone();
2192	} else {
2193	memberDecl = new ObjectDecl( (*member)->get_name(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, offsetType->clone(), 0 );
2194	}
2195	inits.push_back( new SingleInit( new OffsetofExpr( ty->clone(), memberDecl ) ) );
2196	}
2197
2198	// build the offset array and replace the pack with a reference to it
2199	ObjectDecl *offsetArray = makeVar( offsetName, new ArrayType( Type::Qualifiers(), offsetType, new ConstantExpr( Constant::from_ulong( baseMembers.size() ) ), false, false ),
2200	new ListInit( inits ) );
2201	ret = new VariableExpr( offsetArray );
2202	}
2203	}
2204
2205	delete offsetPackExpr;
2206	return ret;
2207	}
2208
2209	void PolyGenericCalculator::doBeginScope() {
2210	knownLayouts.beginScope();
2211	knownOffsets.beginScope();
2212	}
2213
2214	void PolyGenericCalculator::doEndScope() {
2215	knownLayouts.endScope();
2216	knownOffsets.endScope();
2217	}
2218
2219	////////////////////////////////////////// Pass3 ////////////////////////////////////////////////////
2220
2221	template< typename DeclClass >
2222	DeclClass * Pass3::handleDecl( DeclClass decl, Type type ) {
2223	scopeTyVars.beginScope();
2224	makeTyVarMap( type, scopeTyVars );
2225
2226	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
2227	ScrubTyVars::scrub( decl, scopeTyVars );
2228
2229	scopeTyVars.endScope();
2230	return ret;
2231	}
2232
2233	ObjectDecl * Pass3::mutate( ObjectDecl *objectDecl ) {
2234	return handleDecl( objectDecl, objectDecl->get_type() );
2235	}
2236
2237	DeclarationWithType * Pass3::mutate( FunctionDecl *functionDecl ) {
2238	return handleDecl( functionDecl, functionDecl->get_functionType() );
2239	}
2240
2241	TypedefDecl * Pass3::mutate( TypedefDecl *typedefDecl ) {
2242	return handleDecl( typedefDecl, typedefDecl->get_base() );
2243	}
2244
2245	TypeDecl * Pass3::mutate( TypeDecl *typeDecl ) {
2246	// Initializer *init = 0;
2247	// std::list< Expression *> designators;
2248	// scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
2249	// if ( typeDecl->get_base() ) {
2250	// init = new SimpleInit( new SizeofExpr( handleDecl( typeDecl, typeDecl->get_base() ) ), designators );
2251	// }
2252	// return new ObjectDecl( typeDecl->get_name(), Declaration::Extern, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::UnsignedInt ), init );
2253
2254	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
2255	return Mutator::mutate( typeDecl );
2256	}
2257
2258	Type * Pass3::mutate( PointerType *pointerType ) {
2259	scopeTyVars.beginScope();
2260	makeTyVarMap( pointerType, scopeTyVars );
2261
2262	Type *ret = Mutator::mutate( pointerType );
2263
2264	scopeTyVars.endScope();
2265	return ret;
2266	}
2267
2268	Type * Pass3::mutate( FunctionType *functionType ) {
2269	scopeTyVars.beginScope();
2270	makeTyVarMap( functionType, scopeTyVars );
2271
2272	Type *ret = Mutator::mutate( functionType );
2273
2274	scopeTyVars.endScope();
2275	return ret;
2276	}
2277	} // anonymous namespace
2278	} // namespace GenPoly
2279
2280	// Local Variables: //
2281	// tab-width: 4 //
2282	// mode: c++ //
2283	// compile-command: "make install" //
2284	// End: //

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