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source: src/GenPoly/Box.cc @ 0531b5d

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

Last change on this file since 0531b5d was 0531b5d, checked in by Aaron Moss <a3moss@…>, 8 years ago
Fixed ScopedMap?'s const find, refactored InstantionMap? to use ScopedMap?
Property mode set to `100644`
File size: 92.5 KB

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

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