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source: src/GenPoly/Box.cc @ bd91e2a

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Last change on this file since bd91e2a was bd91e2a, checked in by Aaron Moss <a3moss@…>, 8 years ago
Properly clone types in layout function generation
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File size: 79.1 KB

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1	//
2	// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
3	//
4	// The contents of this file are covered under the licence agreement in the
5	// file "LICENCE" distributed with Cforall.
6	//
7	// Box.cc --
8	//
9	// Author : Richard C. Bilson
10	// Created On : Mon May 18 07:44:20 2015
11	// Last Modified By : Peter A. Buhr
12	// Last Modified On : Fri Feb 5 16:45:07 2016
13	// Update Count : 286
14	//
15
16	#include <set>
17	#include <stack>
18	#include <string>
19	#include <iterator>
20	#include <algorithm>
21	#include <cassert>
22
23	#include "Box.h"
24	#include "DeclMutator.h"
25	#include "InstantiateGeneric.h"
26	#include "PolyMutator.h"
27	#include "FindFunction.h"
28	#include "ScrubTyVars.h"
29
30	#include "Parser/ParseNode.h"
31
32	#include "SynTree/Constant.h"
33	#include "SynTree/Type.h"
34	#include "SynTree/Expression.h"
35	#include "SynTree/Initializer.h"
36	#include "SynTree/Statement.h"
37	#include "SynTree/Mutator.h"
38
39	#include "ResolvExpr/TypeEnvironment.h"
40	#include "ResolvExpr/TypeMap.h"
41	#include "ResolvExpr/typeops.h"
42
43	#include "SymTab/Mangler.h"
44
45	#include "Common/SemanticError.h"
46	#include "Common/UniqueName.h"
47	#include "Common/utility.h"
48
49	#include <ext/functional> // temporary
50
51	namespace GenPoly {
52	namespace {
53	const std::list<Label> noLabels;
54
55	FunctionType makeAdapterType( FunctionType adaptee, const TyVarMap &tyVars );
56
57	/// Adds layout-generation functions to polymorphic types
58	class LayoutFunctionBuilder : public DeclMutator {
59	unsigned int functionNesting; // current level of nested functions
60	public:
61	LayoutFunctionBuilder() : functionNesting( 0 ) {}
62
63	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
64	virtual Declaration mutate( StructDecl structDecl );
65	virtual Declaration mutate( UnionDecl unionDecl );
66	};
67
68	/// 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
69	class Pass1 : public PolyMutator {
70	public:
71	Pass1();
72	virtual Expression mutate( ApplicationExpr appExpr );
73	virtual Expression mutate( AddressExpr addrExpr );
74	virtual Expression mutate( UntypedExpr expr );
75	virtual DeclarationWithType* mutate( FunctionDecl *functionDecl );
76	virtual TypeDecl mutate( TypeDecl typeDecl );
77	virtual Expression mutate( CommaExpr commaExpr );
78	virtual Expression mutate( ConditionalExpr condExpr );
79	virtual Statement * mutate( ReturnStmt *returnStmt );
80	virtual Type mutate( PointerType pointerType );
81	virtual Type * mutate( FunctionType *functionType );
82
83	virtual void doBeginScope();
84	virtual void doEndScope();
85	private:
86	/// Makes a new temporary array holding the offsets of the fields of `type`, and returns a new variable expression referencing it
87	Expression makeOffsetArray( StructInstType type );
88	/// Pass the extra type parameters from polymorphic generic arguments or return types into a function application
89	void passArgTypeVars( ApplicationExpr appExpr, Type parmType, Type argBaseType, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars, std::set< std::string > &seenTypes );
90	/// passes extra type parameters into a polymorphic function application
91	void passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars );
92	/// wraps a function application with a new temporary for the out-parameter return value
93	Expression addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg );
94	/// Replaces all the type parameters of a generic type with their concrete equivalents under the current environment
95	void replaceParametersWithConcrete( ApplicationExpr appExpr, std::list< Expression >& params );
96	/// Replaces a polymorphic type with its concrete equivalant under the current environment (returns itself if concrete).
97	/// If `doClone` is set to false, will not clone interior types
98	Type replaceWithConcrete( ApplicationExpr appExpr, Type *type, bool doClone = true );
99	/// wraps a function application returning a polymorphic type with a new temporary for the out-parameter return value
100	Expression addPolyRetParam( ApplicationExpr appExpr, FunctionType function, ReferenceToType polyType, std::list< Expression *>::iterator &arg );
101	Expression applyAdapter( ApplicationExpr appExpr, FunctionType function, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars );
102	void boxParam( Type formal, Expression &arg, const TyVarMap &exprTyVars );
103	void boxParams( ApplicationExpr appExpr, FunctionType function, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars );
104	void addInferredParams( ApplicationExpr appExpr, FunctionType functionType, std::list< Expression *>::iterator &arg, const TyVarMap &tyVars );
105	/// Stores assignment operators from assertion list in local map of assignment operations
106	void findAssignOps( const std::list< TypeDecl *> &forall );
107	void passAdapters( ApplicationExpr appExpr, FunctionType functionType, const TyVarMap &exprTyVars );
108	FunctionDecl makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars );
109	/// Replaces intrinsic operator functions with their arithmetic desugaring
110	Expression handleIntrinsics( ApplicationExpr appExpr );
111	/// Inserts a new temporary variable into the current scope with an auto-generated name
112	ObjectDecl makeTemporary( Type type );
113
114	typedef std::map< std::string, DeclarationWithType *> AdapterMap;
115	std::map< std::string, DeclarationWithType *> assignOps;
116	ResolvExpr::TypeMap< DeclarationWithType > scopedAssignOps;
117	std::stack< AdapterMap > adapters;
118	DeclarationWithType *retval;
119	bool useRetval;
120	UniqueName tempNamer;
121	};
122
123	/// Moves polymorphic returns in function types to pointer-type parameters, adds type size and assertion parameters to parameter lists as well
124	class Pass2 : public PolyMutator {
125	public:
126	template< typename DeclClass >
127	DeclClass handleDecl( DeclClass decl, Type *type );
128	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
129	virtual ObjectDecl mutate( ObjectDecl objectDecl );
130	virtual TypeDecl mutate( TypeDecl typeDecl );
131	virtual TypedefDecl mutate( TypedefDecl typedefDecl );
132	virtual Type mutate( PointerType pointerType );
133	virtual Type mutate( FunctionType funcType );
134	private:
135	void addAdapters( FunctionType *functionType );
136
137	std::map< UniqueId, std::string > adapterName;
138	};
139
140	/// Replaces member expressions for polymorphic types with calculated add-field-offset-and-dereference;
141	/// also fixes offsetof expressions.
142	class MemberExprFixer : public PolyMutator {
143	public:
144	template< typename DeclClass >
145	DeclClass handleDecl( DeclClass decl, Type *type );
146	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
147	virtual ObjectDecl mutate( ObjectDecl objectDecl );
148	virtual TypedefDecl mutate( TypedefDecl objectDecl );
149	virtual TypeDecl mutate( TypeDecl objectDecl );
150	virtual Statement mutate( DeclStmt declStmt );
151	virtual Type mutate( PointerType pointerType );
152	virtual Type mutate( FunctionType funcType );
153	virtual Expression mutate( MemberExpr memberExpr );
154	virtual Expression mutate( OffsetofExpr offsetofExpr );
155	};
156
157	/// 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
158	class Pass3 : public PolyMutator {
159	public:
160	template< typename DeclClass >
161	DeclClass handleDecl( DeclClass decl, Type *type );
162	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
163	virtual ObjectDecl mutate( ObjectDecl objectDecl );
164	virtual TypedefDecl mutate( TypedefDecl objectDecl );
165	virtual TypeDecl mutate( TypeDecl objectDecl );
166	virtual Type mutate( PointerType pointerType );
167	virtual Type mutate( FunctionType funcType );
168	private:
169	};
170
171	} // anonymous namespace
172
173	/// version of mutateAll with special handling for translation unit so you can check the end of the prelude when debugging
174	template< typename MutatorType >
175	inline void mutateTranslationUnit( std::list< Declaration* > &translationUnit, MutatorType &mutator ) {
176	bool seenIntrinsic = false;
177	SemanticError errors;
178	for ( typename std::list< Declaration* >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) {
179	try {
180	if ( *i ) {
181	if ( (*i)->get_linkage() == LinkageSpec::Intrinsic ) {
182	seenIntrinsic = true;
183	} else if ( seenIntrinsic ) {
184	seenIntrinsic = false; // break on this line when debugging for end of prelude
185	}
186
187	i = dynamic_cast< Declaration >( (*i)->acceptMutator( mutator ) );
188	assert( *i );
189	} // if
190	} catch( SemanticError &e ) {
191	errors.append( e );
192	} // try
193	} // for
194	if ( ! errors.isEmpty() ) {
195	throw errors;
196	} // if
197	}
198
199	void box( std::list< Declaration *>& translationUnit ) {
200	LayoutFunctionBuilder layoutBuilder;
201	Pass1 pass1;
202	Pass2 pass2;
203	MemberExprFixer memberFixer;
204	Pass3 pass3;
205	layoutBuilder.mutateDeclarationList( translationUnit );
206	mutateTranslationUnit/All/( translationUnit, pass1 );
207	mutateTranslationUnit/All/( translationUnit, pass2 );
208	instantiateGeneric( translationUnit );
209	mutateTranslationUnit/All/( translationUnit, memberFixer );
210	mutateTranslationUnit/All/( translationUnit, pass3 );
211	}
212
213	////////////////////////////////// LayoutFunctionBuilder ////////////////////////////////////////////
214
215	DeclarationWithType LayoutFunctionBuilder::mutate( FunctionDecl functionDecl ) {
216	functionDecl->set_functionType( maybeMutate( functionDecl->get_functionType(), *this ) );
217	mutateAll( functionDecl->get_oldDecls(), *this );
218	++functionNesting;
219	functionDecl->set_statements( maybeMutate( functionDecl->get_statements(), *this ) );
220	--functionNesting;
221	return functionDecl;
222	}
223
224	/// Get a list of type declarations that will affect a layout function
225	std::list< TypeDecl* > takeOtypeOnly( std::list< TypeDecl* > &decls ) {
226	std::list< TypeDecl * > otypeDecls;
227
228	for ( std::list< TypeDecl* >::const_iterator decl = decls.begin(); decl != decls.end(); ++decl ) {
229	if ( (*decl)->get_kind() == TypeDecl::Any ) {
230	otypeDecls.push_back( *decl );
231	}
232	}
233
234	return otypeDecls;
235	}
236
237	/// Adds parameters for otype layout to a function type
238	void addOtypeParams( FunctionType layoutFnType, std::list< TypeDecl > &otypeParams ) {
239	BasicType sizeAlignType( Type::Qualifiers(), BasicType::LongUnsignedInt );
240
241	for ( std::list< TypeDecl* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
242	layoutFnType->get_parameters().push_back( new ObjectDecl( sizeofName( (*param)->get_base() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
243	}
244	}
245
246	/// Builds a layout function declaration
247	FunctionDecl buildLayoutFunctionDecl( const std::string &typeName, unsigned int functionNesting, FunctionType layoutFnType ) {
248	// Routines at global scope marked "static" to prevent multiple definitions is separate translation units
249	// because each unit generates copies of the default routines for each aggregate.
250	FunctionDecl *layoutDecl = new FunctionDecl(
251	"__layoutof_" + typeName, functionNesting > 0 ? DeclarationNode::NoStorageClass : DeclarationNode::Static, LinkageSpec::AutoGen, layoutFnType, new CompoundStmt( noLabels ), true, false );
252	layoutDecl->fixUniqueId();
253	return layoutDecl;
254	}
255
256	/// Makes a unary operation
257	Expression makeOp( const std::string &name, Expression arg ) {
258	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
259	expr->get_args().push_back( arg );
260	return expr;
261	}
262
263	/// Makes a binary operation
264	Expression makeOp( const std::string &name, Expression lhs, Expression *rhs ) {
265	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
266	expr->get_args().push_back( lhs );
267	expr->get_args().push_back( rhs );
268	return expr;
269	}
270
271	/// Returns the dereference of a local pointer variable
272	Expression derefVar( ObjectDecl var ) {
273	return makeOp( "*?", new VariableExpr( var ) );
274	}
275
276	/// makes an if-statement with a single-expression if-block and no then block
277	Statement makeCond( Expression cond, Expression *ifPart ) {
278	return new IfStmt( noLabels, cond, new ExprStmt( noLabels, ifPart ), 0 );
279	}
280
281	/// makes a statement that assigns rhs to lhs if lhs < rhs
282	Statement makeAssignMax( Expression lhs, Expression *rhs ) {
283	return makeCond( makeOp( "?<?", lhs, rhs ), makeOp( "?=?", lhs->clone(), rhs->clone() ) );
284	}
285
286	/// makes a statement that aligns lhs to rhs (rhs should be an integer power of two)
287	Statement makeAlignTo( Expression lhs, Expression *rhs ) {
288	// check that the lhs is zeroed out to the level of rhs
289	Expression *ifCond = makeOp( "?&?", lhs, makeOp( "?-?", rhs, new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), "1" ) ) ) );
290	// if not aligned, increment to alignment
291	Expression *ifExpr = makeOp( "?+=?", lhs->clone(), makeOp( "?-?", rhs->clone(), ifCond->clone() ) );
292	return makeCond( ifCond, ifExpr );
293	}
294
295	/// adds an expression to a compound statement
296	void addExpr( CompoundStmt stmts, Expression expr ) {
297	stmts->get_kids().push_back( new ExprStmt( noLabels, expr ) );
298	}
299
300	/// adds a statement to a compound statement
301	void addStmt( CompoundStmt stmts, Statement stmt ) {
302	stmts->get_kids().push_back( stmt );
303	}
304
305	Declaration LayoutFunctionBuilder::mutate( StructDecl structDecl ) {
306	// do not generate layout function for "empty" tag structs
307	if ( structDecl->get_members().empty() ) return structDecl;
308
309	// get parameters that can change layout, exiting early if none
310	std::list< TypeDecl* > otypeParams = takeOtypeOnly( structDecl->get_parameters() );
311	if ( otypeParams.empty() ) return structDecl;
312
313	// build layout function signature
314	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
315	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
316	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
317
318	ObjectDecl *sizeParam = new ObjectDecl( "__sizeof_" + structDecl->get_name(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
319	layoutFnType->get_parameters().push_back( sizeParam );
320	ObjectDecl *alignParam = new ObjectDecl( "__alignof_" + structDecl->get_name(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
321	layoutFnType->get_parameters().push_back( alignParam );
322	ObjectDecl *offsetParam = new ObjectDecl( "__offsetof_" + structDecl->get_name(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
323	layoutFnType->get_parameters().push_back( offsetParam );
324	addOtypeParams( layoutFnType, otypeParams );
325
326	// build function decl
327	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( structDecl->get_name(), functionNesting, layoutFnType );
328
329	// calculate struct layout in function body
330
331	// initialize size and alignment to 0 and 1 (will have at least one member to re-edit size
332	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "0" ) ) ) );
333	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
334	unsigned long n_members = 0;
335	bool firstMember = true;
336	for ( std::list< Declaration* >::const_iterator member = structDecl->get_members().begin(); member != structDecl->get_members().end(); ++member ) {
337	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
338	assert( dwt );
339	Type *memberType = dwt->get_type();
340
341	if ( firstMember ) {
342	firstMember = false;
343	} else {
344	// make sure all members after the first (automatically aligned at 0) are properly padded for alignment
345	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), new AlignofExpr( memberType->clone() ) ) );
346	}
347
348	// place current size in the current offset index
349	addExpr( layoutDecl->get_statements(), makeOp( "?=?", makeOp( "?[?]", new VariableExpr( offsetParam ), new ConstantExpr( Constant::from( n_members ) ) ),
350	derefVar( sizeParam ) ) );
351	++n_members;
352
353	// add member size to current size
354	addExpr( layoutDecl->get_statements(), makeOp( "?+=?", derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
355
356	// take max of member alignment and global alignment
357	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
358	}
359	// make sure the type is end-padded to a multiple of its alignment
360	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
361
362	addDeclarationAfter( layoutDecl );
363	return structDecl;
364	}
365
366	Declaration LayoutFunctionBuilder::mutate( UnionDecl unionDecl ) {
367	// do not generate layout function for "empty" tag unions
368	if ( unionDecl->get_members().empty() ) return unionDecl;
369
370	// get parameters that can change layout, exiting early if none
371	std::list< TypeDecl* > otypeParams = takeOtypeOnly( unionDecl->get_parameters() );
372	if ( otypeParams.empty() ) return unionDecl;
373
374	// build layout function signature
375	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
376	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
377	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
378
379	ObjectDecl *sizeParam = new ObjectDecl( "__sizeof_" + unionDecl->get_name(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
380	layoutFnType->get_parameters().push_back( sizeParam );
381	ObjectDecl *alignParam = new ObjectDecl( "__alignof_" + unionDecl->get_name(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
382	layoutFnType->get_parameters().push_back( alignParam );
383	addOtypeParams( layoutFnType, otypeParams );
384
385	// build function decl
386	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( unionDecl->get_name(), functionNesting, layoutFnType );
387
388	// calculate union layout in function body
389	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
390	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
391	for ( std::list< Declaration* >::const_iterator member = unionDecl->get_members().begin(); member != unionDecl->get_members().end(); ++member ) {
392	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
393	assert( dwt );
394	Type *memberType = dwt->get_type();
395
396	// take max member size and global size
397	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
398
399	// take max of member alignment and global alignment
400	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
401	}
402	// make sure the type is end-padded to a multiple of its alignment
403	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
404
405	addDeclarationAfter( layoutDecl );
406	return unionDecl;
407	}
408
409	////////////////////////////////////////// Pass1 ////////////////////////////////////////////////////
410
411	namespace {
412	std::string makePolyMonoSuffix( FunctionType * function, const TyVarMap &tyVars ) {
413	std::stringstream name;
414
415	// NOTE: this function previously used isPolyObj, which failed to produce
416	// the correct thing in some situations. It's not clear to me why this wasn't working.
417
418	// if the return type or a parameter type involved polymorphic types, then the adapter will need
419	// to take those polymorphic types as pointers. Therefore, there can be two different functions
420	// with the same mangled name, so we need to further mangle the names.
421	for ( std::list< DeclarationWithType *>::iterator retval = function->get_returnVals().begin(); retval != function->get_returnVals().end(); ++retval ) {
422	if ( isPolyType( (*retval)->get_type(), tyVars ) ) {
423	name << "P";
424	} else {
425	name << "M";
426	}
427	}
428	name << "_";
429	std::list< DeclarationWithType *> &paramList = function->get_parameters();
430	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
431	if ( isPolyType( (*arg)->get_type(), tyVars ) ) {
432	name << "P";
433	} else {
434	name << "M";
435	}
436	} // for
437	return name.str();
438	}
439
440	std::string mangleAdapterName( FunctionType * function, const TyVarMap &tyVars ) {
441	return SymTab::Mangler::mangle( function ) + makePolyMonoSuffix( function, tyVars );
442	}
443
444	std::string makeAdapterName( const std::string &mangleName ) {
445	return "_adapter" + mangleName;
446	}
447
448	Pass1::Pass1() : useRetval( false ), tempNamer( "_temp" ) {
449	adapters.push(AdapterMap());
450	}
451
452	/// Returns T if the given declaration is (?=?)(T , T) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
453	TypeInstType isTypeInstAssignment( DeclarationWithType decl ) {
454	if ( decl->get_name() == "?=?" ) {
455	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
456	if ( funType->get_parameters().size() == 2 ) {
457	if ( PointerType pointer = dynamic_cast< PointerType >( funType->get_parameters().front()->get_type() ) ) {
458	if ( TypeInstType refType = dynamic_cast< TypeInstType >( pointer->get_base() ) ) {
459	if ( TypeInstType refType2 = dynamic_cast< TypeInstType >( funType->get_parameters().back()->get_type() ) ) {
460	if ( refType->get_name() == refType2->get_name() ) {
461	return refType;
462	} // if
463	} // if
464	} // if
465	} // if
466	} // if
467	} // if
468	} // if
469	return 0;
470	}
471
472	/// returns T if the given declaration is: (?=?)(T , T) for some type T (return not checked, but maybe should be), NULL otherwise
473	/// Only picks assignments where neither parameter is cv-qualified
474	Type isAssignment( DeclarationWithType decl ) {
475	if ( decl->get_name() == "?=?" ) {
476	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
477	if ( funType->get_parameters().size() == 2 ) {
478	Type::Qualifiers defaultQualifiers;
479	Type *paramType1 = funType->get_parameters().front()->get_type();
480	if ( paramType1->get_qualifiers() != defaultQualifiers ) return 0;
481	Type *paramType2 = funType->get_parameters().back()->get_type();
482	if ( paramType2->get_qualifiers() != defaultQualifiers ) return 0;
483
484	if ( PointerType pointerType = dynamic_cast< PointerType >( paramType1 ) ) {
485	Type *baseType1 = pointerType->get_base();
486	if ( baseType1->get_qualifiers() != defaultQualifiers ) return 0;
487	SymTab::Indexer dummy;
488	if ( ResolvExpr::typesCompatible( baseType1, paramType2, dummy ) ) {
489	return baseType1;
490	} // if
491	} // if
492	} // if
493	} // if
494	} // if
495	return 0;
496	}
497
498	void Pass1::findAssignOps( const std::list< TypeDecl *> &forall ) {
499	// what if a nested function uses an assignment operator?
500	// assignOps.clear();
501	for ( std::list< TypeDecl *>::const_iterator i = forall.begin(); i != forall.end(); ++i ) {
502	for ( std::list< DeclarationWithType >::const_iterator assert = (i)->get_assertions().begin(); assert != (*i)->get_assertions().end(); ++assert ) {
503	std::string typeName;
504	if ( TypeInstType typeInst = isTypeInstAssignment( assert ) ) {
505	assignOps[ typeInst->get_name() ] = *assert;
506	} // if
507	} // for
508	} // for
509	}
510
511	DeclarationWithType Pass1::mutate( FunctionDecl functionDecl ) {
512	// if this is a polymorphic assignment function, put it in the map for this scope
513	if ( Type *assignedType = isAssignment( functionDecl ) ) {
514	if ( ! dynamic_cast< TypeInstType* >( assignedType ) ) {
515	scopedAssignOps.insert( assignedType, functionDecl );
516	}
517	}
518
519	if ( functionDecl->get_statements() ) { // empty routine body ?
520	doBeginScope();
521	TyVarMap oldtyVars = scopeTyVars;
522	std::map< std::string, DeclarationWithType *> oldassignOps = assignOps;
523	DeclarationWithType *oldRetval = retval;
524	bool oldUseRetval = useRetval;
525
526	// process polymorphic return value
527	retval = 0;
528	if ( isPolyRet( functionDecl->get_functionType() ) && functionDecl->get_linkage() == LinkageSpec::Cforall ) {
529	retval = functionDecl->get_functionType()->get_returnVals().front();
530
531	// give names to unnamed return values
532	if ( retval->get_name() == "" ) {
533	retval->set_name( "_retparm" );
534	retval->set_linkage( LinkageSpec::C );
535	} // if
536	} // if
537
538	FunctionType *functionType = functionDecl->get_functionType();
539	makeTyVarMap( functionDecl->get_functionType(), scopeTyVars );
540	findAssignOps( functionDecl->get_functionType()->get_forall() );
541
542	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
543	std::list< FunctionType *> functions;
544	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
545	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
546	findFunction( (*assert)->get_type(), functions, scopeTyVars, needsAdapter );
547	} // for
548	} // for
549	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
550	findFunction( (*arg)->get_type(), functions, scopeTyVars, needsAdapter );
551	} // for
552
553	AdapterMap & adapters = Pass1::adapters.top();
554	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
555	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
556	if ( adapters.find( mangleName ) == adapters.end() ) {
557	std::string adapterName = makeAdapterName( mangleName );
558	adapters.insert( std::pair< std::string, DeclarationWithType >( mangleName, new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( funType, scopeTyVars ) ), 0 ) ) );
559	} // if
560	} // for
561
562	functionDecl->set_statements( functionDecl->get_statements()->acceptMutator( *this ) );
563
564	scopeTyVars = oldtyVars;
565	assignOps = oldassignOps;
566	// std::cerr << "end FunctionDecl: ";
567	// for ( TyVarMap::iterator i = scopeTyVars.begin(); i != scopeTyVars.end(); ++i ) {
568	// std::cerr << i->first << " ";
569	// }
570	// std::cerr << "\n";
571	retval = oldRetval;
572	useRetval = oldUseRetval;
573	doEndScope();
574	} // if
575	return functionDecl;
576	}
577
578	TypeDecl Pass1::mutate( TypeDecl typeDecl ) {
579	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
580	return Mutator::mutate( typeDecl );
581	}
582
583	Expression Pass1::mutate( CommaExpr commaExpr ) {
584	bool oldUseRetval = useRetval;
585	useRetval = false;
586	commaExpr->set_arg1( maybeMutate( commaExpr->get_arg1(), *this ) );
587	useRetval = oldUseRetval;
588	commaExpr->set_arg2( maybeMutate( commaExpr->get_arg2(), *this ) );
589	return commaExpr;
590	}
591
592	Expression Pass1::mutate( ConditionalExpr condExpr ) {
593	bool oldUseRetval = useRetval;
594	useRetval = false;
595	condExpr->set_arg1( maybeMutate( condExpr->get_arg1(), *this ) );
596	useRetval = oldUseRetval;
597	condExpr->set_arg2( maybeMutate( condExpr->get_arg2(), *this ) );
598	condExpr->set_arg3( maybeMutate( condExpr->get_arg3(), *this ) );
599	return condExpr;
600
601	}
602
603	Expression Pass1::makeOffsetArray( StructInstType ty ) {
604	std::list< Declaration* > &baseMembers = ty->get_baseStruct()->get_members();
605
606	// make a new temporary array
607	Type *offsetType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
608	std::stringstream lenGen;
609	lenGen << baseMembers.size();
610	ConstantExpr *lenExpr = new ConstantExpr( Constant( offsetType->clone(), lenGen.str() ) );
611	ObjectDecl *arrayTemp = makeTemporary( new ArrayType( Type::Qualifiers(), offsetType, lenExpr, false, false ) );
612
613	// build initializer list for temporary
614	std::list< Initializer* > inits;
615	for ( std::list< Declaration* >::const_iterator member = baseMembers.begin(); member != baseMembers.end(); ++member ) {
616	DeclarationWithType *memberDecl;
617	if ( DeclarationWithType origMember = dynamic_cast< DeclarationWithType >( *member ) ) {
618	memberDecl = origMember->clone();
619	} else {
620	memberDecl = new ObjectDecl( (*member)->get_name(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, offsetType->clone(), 0 );
621	}
622	inits.push_back( new SingleInit( new OffsetofExpr( ty->clone(), memberDecl ) ) );
623	}
624	arrayTemp->set_init( new ListInit( inits ) );
625
626	// return variable pointing to temporary
627	return new VariableExpr( arrayTemp );
628	}
629
630	void Pass1::passArgTypeVars( ApplicationExpr appExpr, Type parmType, Type argBaseType, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars, std::set< std::string > &seenTypes ) {
631	Type *polyBase = hasPolyBase( parmType, exprTyVars );
632	if ( polyBase && ! dynamic_cast< TypeInstType* >( polyBase ) ) {
633	std::string sizeName = sizeofName( polyBase );
634	if ( seenTypes.count( sizeName ) ) return;
635
636	arg = appExpr->get_args().insert( arg, new SizeofExpr( argBaseType->clone() ) );
637	arg++;
638	arg = appExpr->get_args().insert( arg, new AlignofExpr( argBaseType->clone() ) );
639	arg++;
640	if ( dynamic_cast< StructInstType* >( polyBase ) ) {
641	if ( StructInstType argBaseStructType = dynamic_cast< StructInstType >( argBaseType ) ) {
642	arg = appExpr->get_args().insert( arg, makeOffsetArray( argBaseStructType ) );
643	arg++;
644	} else {
645	throw SemanticError( "Cannot pass non-struct type for generic struct" );
646	}
647	}
648
649	seenTypes.insert( sizeName );
650	}
651	}
652
653	void Pass1::passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
654	// pass size/align for type variables
655	for ( TyVarMap::const_iterator tyParm = exprTyVars.begin(); tyParm != exprTyVars.end(); ++tyParm ) {
656	ResolvExpr::EqvClass eqvClass;
657	assert( env );
658	if ( tyParm->second == TypeDecl::Any ) {
659	Type *concrete = env->lookup( tyParm->first );
660	if ( concrete ) {
661	arg = appExpr->get_args().insert( arg, new SizeofExpr( concrete->clone() ) );
662	arg++;
663	arg = appExpr->get_args().insert( arg, new AlignofExpr( concrete->clone() ) );
664	arg++;
665	} else {
666	throw SemanticError( "unbound type variable in application ", appExpr );
667	} // if
668	} // if
669	} // for
670
671	// add size/align for generic types to parameter list
672	if ( appExpr->get_function()->get_results().empty() ) return;
673	FunctionType *funcType = getFunctionType( appExpr->get_function()->get_results().front() );
674	assert( funcType );
675
676	std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin();
677	std::list< Expression* >::const_iterator fnArg = arg;
678	std::set< std::string > seenTypes; //< names for generic types we've seen
679
680	// a polymorphic return type may need to be added to the argument list
681	if ( polyRetType ) {
682	Type *concRetType = replaceWithConcrete( appExpr, polyRetType );
683	passArgTypeVars( appExpr, polyRetType, concRetType, arg, exprTyVars, seenTypes );
684	}
685
686	// add type information args for presently unseen types in parameter list
687	for ( ; fnParm != funcType->get_parameters().end() && fnArg != appExpr->get_args().end(); ++fnParm, ++fnArg ) {
688	VariableExpr fnArgBase = getBaseVar( fnArg );
689	if ( ! fnArgBase \|\| fnArgBase->get_results().empty() ) continue;
690	passArgTypeVars( appExpr, (*fnParm)->get_type(), fnArgBase->get_results().front(), arg, exprTyVars, seenTypes );
691	}
692	}
693
694	ObjectDecl Pass1::makeTemporary( Type type ) {
695	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, 0 );
696	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
697	return newObj;
698	}
699
700	Expression Pass1::addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg ) {
701	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
702	// if ( useRetval ) {
703	// assert( retval );
704	// arg = appExpr->get_args().insert( arg, new VariableExpr( retval ) );
705	// arg++;
706	// } else {
707
708	// Create temporary to hold return value of polymorphic function and produce that temporary as a result
709	// using a comma expression. Possibly change comma expression into statement expression "{}" for multiple
710	// return values.
711	ObjectDecl *newObj = makeTemporary( retType->clone() );
712	Expression *paramExpr = new VariableExpr( newObj );
713
714	// If the type of the temporary is not polymorphic, box temporary by taking its address;
715	// otherwise the temporary is already boxed and can be used directly.
716	if ( ! isPolyType( newObj->get_type(), scopeTyVars, env ) ) {
717	paramExpr = new AddressExpr( paramExpr );
718	} // if
719	arg = appExpr->get_args().insert( arg, paramExpr ); // add argument to function call
720	arg++;
721	// Build a comma expression to call the function and emulate a normal return.
722	CommaExpr *commaExpr = new CommaExpr( appExpr, new VariableExpr( newObj ) );
723	commaExpr->set_env( appExpr->get_env() );
724	appExpr->set_env( 0 );
725	return commaExpr;
726	// } // if
727	// return appExpr;
728	}
729
730	void Pass1::replaceParametersWithConcrete( ApplicationExpr appExpr, std::list< Expression >& params ) {
731	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
732	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
733	assert(paramType && "Aggregate parameters should be type expressions");
734	paramType->set_type( replaceWithConcrete( appExpr, paramType->get_type(), false ) );
735	}
736	}
737
738	Type Pass1::replaceWithConcrete( ApplicationExpr appExpr, Type *type, bool doClone ) {
739	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
740	Type *concrete = env->lookup( typeInst->get_name() );
741	if ( concrete == 0 ) {
742	throw SemanticError( "Unbound type variable " + typeInst->get_name() + " in ", appExpr );
743	} // if
744	return concrete;
745	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
746	if ( doClone ) {
747	structType = structType->clone();
748	}
749	replaceParametersWithConcrete( appExpr, structType->get_parameters() );
750	return structType;
751	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
752	if ( doClone ) {
753	unionType = unionType->clone();
754	}
755	replaceParametersWithConcrete( appExpr, unionType->get_parameters() );
756	return unionType;
757	}
758	return type;
759	}
760
761	Expression Pass1::addPolyRetParam( ApplicationExpr appExpr, FunctionType function, ReferenceToType polyType, std::list< Expression *>::iterator &arg ) {
762	assert( env );
763	Type *concrete = replaceWithConcrete( appExpr, polyType );
764	// add out-parameter for return value
765	return addRetParam( appExpr, function, concrete, arg );
766	}
767
768	Expression Pass1::applyAdapter( ApplicationExpr appExpr, FunctionType function, std::list< Expression >::iterator &arg, const TyVarMap &tyVars ) {
769	Expression *ret = appExpr;
770	if ( ! function->get_returnVals().empty() && isPolyType( function->get_returnVals().front()->get_type(), tyVars ) ) {
771	ret = addRetParam( appExpr, function, function->get_returnVals().front()->get_type(), arg );
772	} // if
773	std::string mangleName = mangleAdapterName( function, tyVars );
774	std::string adapterName = makeAdapterName( mangleName );
775
776	// cast adaptee to void (*)(), since it may have any type inside a polymorphic function
777	Type * adapteeType = new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) );
778	appExpr->get_args().push_front( new CastExpr( appExpr->get_function(), adapteeType ) );
779	appExpr->set_function( new NameExpr( adapterName ) );
780
781	return ret;
782	}
783
784	void Pass1::boxParam( Type param, Expression &arg, const TyVarMap &exprTyVars ) {
785	assert( ! arg->get_results().empty() );
786	if ( isPolyType( param, exprTyVars ) ) {
787	if ( isPolyType( arg->get_results().front() ) ) {
788	// if the argument's type is polymorphic, we don't need to box again!
789	return;
790	} else if ( arg->get_results().front()->get_isLvalue() ) {
791	// VariableExpr and MemberExpr are lvalues
792	arg = new AddressExpr( arg );
793	} else {
794	// use type computed in unification to declare boxed variables
795	Type * newType = param->clone();
796	if ( env ) env->apply( newType );
797	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, newType, 0 );
798	newObj->get_type()->get_qualifiers() = Type::Qualifiers(); // TODO: is this right???
799	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
800	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
801	assign->get_args().push_back( new VariableExpr( newObj ) );
802	assign->get_args().push_back( arg );
803	stmtsToAdd.push_back( new ExprStmt( noLabels, assign ) );
804	arg = new AddressExpr( new VariableExpr( newObj ) );
805	} // if
806	} // if
807	}
808
809	/// cast parameters to polymorphic functions so that types are replaced with
810	/// void * if they are type parameters in the formal type.
811	/// this gets rid of warnings from gcc.
812	void addCast( Expression &actual, Type formal, const TyVarMap &tyVars ) {
813	Type * newType = formal->clone();
814	if ( getFunctionType( newType ) ) {
815	newType = ScrubTyVars::scrub( newType, tyVars );
816	actual = new CastExpr( actual, newType );
817	} // if
818	}
819
820	void Pass1::boxParams( ApplicationExpr appExpr, FunctionType function, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
821	for ( std::list< DeclarationWithType *>::const_iterator param = function->get_parameters().begin(); param != function->get_parameters().end(); ++param, ++arg ) {
822	assert( arg != appExpr->get_args().end() );
823	addCast( arg, (param)->get_type(), exprTyVars );
824	boxParam( (param)->get_type(), arg, exprTyVars );
825	} // for
826	}
827
828	void Pass1::addInferredParams( ApplicationExpr appExpr, FunctionType functionType, std::list< Expression *>::iterator &arg, const TyVarMap &tyVars ) {
829	std::list< Expression *>::iterator cur = arg;
830	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
831	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
832	InferredParams::const_iterator inferParam = appExpr->get_inferParams().find( (*assert)->get_uniqueId() );
833	assert( inferParam != appExpr->get_inferParams().end() && "NOTE: Explicit casts of polymorphic functions to compatible monomorphic functions are currently unsupported" );
834	Expression *newExpr = inferParam->second.expr->clone();
835	addCast( newExpr, (*assert)->get_type(), tyVars );
836	boxParam( (*assert)->get_type(), newExpr, tyVars );
837	appExpr->get_args().insert( cur, newExpr );
838	} // for
839	} // for
840	}
841
842	void makeRetParm( FunctionType *funcType ) {
843	DeclarationWithType *retParm = funcType->get_returnVals().front();
844
845	// make a new parameter that is a pointer to the type of the old return value
846	retParm->set_type( new PointerType( Type::Qualifiers(), retParm->get_type() ) );
847	funcType->get_parameters().push_front( retParm );
848
849	// we don't need the return value any more
850	funcType->get_returnVals().clear();
851	}
852
853	FunctionType makeAdapterType( FunctionType adaptee, const TyVarMap &tyVars ) {
854	// actually make the adapter type
855	FunctionType *adapter = adaptee->clone();
856	if ( ! adapter->get_returnVals().empty() && isPolyType( adapter->get_returnVals().front()->get_type(), tyVars ) ) {
857	makeRetParm( adapter );
858	} // if
859	adapter->get_parameters().push_front( new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) ), 0 ) );
860	return adapter;
861	}
862
863	Expression makeAdapterArg( DeclarationWithType param, DeclarationWithType arg, DeclarationWithType realParam, const TyVarMap &tyVars ) {
864	assert( param );
865	assert( arg );
866	if ( isPolyType( realParam->get_type(), tyVars ) ) {
867	if ( ! isPolyType( arg->get_type() ) ) {
868	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
869	deref->get_args().push_back( new CastExpr( new VariableExpr( param ), new PointerType( Type::Qualifiers(), arg->get_type()->clone() ) ) );
870	deref->get_results().push_back( arg->get_type()->clone() );
871	return deref;
872	} // if
873	} // if
874	return new VariableExpr( param );
875	}
876
877	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 ) {
878	UniqueName paramNamer( "_p" );
879	for ( ; param != paramEnd; ++param, ++arg, ++realParam ) {
880	if ( (*param)->get_name() == "" ) {
881	(*param)->set_name( paramNamer.newName() );
882	(*param)->set_linkage( LinkageSpec::C );
883	} // if
884	adapteeApp->get_args().push_back( makeAdapterArg( param, arg, *realParam, tyVars ) );
885	} // for
886	}
887
888
889
890	FunctionDecl Pass1::makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars ) {
891	FunctionType *adapterType = makeAdapterType( adaptee, tyVars );
892	adapterType = ScrubTyVars::scrub( adapterType, tyVars );
893	DeclarationWithType *adapteeDecl = adapterType->get_parameters().front();
894	adapteeDecl->set_name( "_adaptee" );
895	ApplicationExpr *adapteeApp = new ApplicationExpr( new CastExpr( new VariableExpr( adapteeDecl ), new PointerType( Type::Qualifiers(), realType ) ) );
896	Statement *bodyStmt;
897
898	std::list< TypeDecl *>::iterator tyArg = realType->get_forall().begin();
899	std::list< TypeDecl *>::iterator tyParam = adapterType->get_forall().begin();
900	std::list< TypeDecl *>::iterator realTyParam = adaptee->get_forall().begin();
901	for ( ; tyParam != adapterType->get_forall().end(); ++tyArg, ++tyParam, ++realTyParam ) {
902	assert( tyArg != realType->get_forall().end() );
903	std::list< DeclarationWithType >::iterator assertArg = (tyArg)->get_assertions().begin();
904	std::list< DeclarationWithType >::iterator assertParam = (tyParam)->get_assertions().begin();
905	std::list< DeclarationWithType >::iterator realAssertParam = (realTyParam)->get_assertions().begin();
906	for ( ; assertParam != (*tyParam)->get_assertions().end(); ++assertArg, ++assertParam, ++realAssertParam ) {
907	assert( assertArg != (*tyArg)->get_assertions().end() );
908	adapteeApp->get_args().push_back( makeAdapterArg( assertParam, assertArg, *realAssertParam, tyVars ) );
909	} // for
910	} // for
911
912	std::list< DeclarationWithType *>::iterator arg = realType->get_parameters().begin();
913	std::list< DeclarationWithType *>::iterator param = adapterType->get_parameters().begin();
914	std::list< DeclarationWithType *>::iterator realParam = adaptee->get_parameters().begin();
915	param++; // skip adaptee parameter
916	if ( realType->get_returnVals().empty() ) {
917	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
918	bodyStmt = new ExprStmt( noLabels, adapteeApp );
919	} else if ( isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
920	if ( (*param)->get_name() == "" ) {
921	(*param)->set_name( "_ret" );
922	(*param)->set_linkage( LinkageSpec::C );
923	} // if
924	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
925	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
926	deref->get_args().push_back( new CastExpr( new VariableExpr( *param++ ), new PointerType( Type::Qualifiers(), realType->get_returnVals().front()->get_type()->clone() ) ) );
927	assign->get_args().push_back( deref );
928	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
929	assign->get_args().push_back( adapteeApp );
930	bodyStmt = new ExprStmt( noLabels, assign );
931	} else {
932	// adapter for a function that returns a monomorphic value
933	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
934	bodyStmt = new ReturnStmt( noLabels, adapteeApp );
935	} // if
936	CompoundStmt *adapterBody = new CompoundStmt( noLabels );
937	adapterBody->get_kids().push_back( bodyStmt );
938	std::string adapterName = makeAdapterName( mangleName );
939	return new FunctionDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, adapterType, adapterBody, false, false );
940	}
941
942	void Pass1::passAdapters( ApplicationExpr * appExpr, FunctionType * functionType, const TyVarMap & exprTyVars ) {
943	// collect a list of function types passed as parameters or implicit parameters (assertions)
944	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
945	std::list< FunctionType *> functions;
946	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
947	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
948	findFunction( (*assert)->get_type(), functions, exprTyVars, needsAdapter );
949	} // for
950	} // for
951	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
952	findFunction( (*arg)->get_type(), functions, exprTyVars, needsAdapter );
953	} // for
954
955	// parameter function types for which an appropriate adapter has been generated. we cannot use the types
956	// after applying substitutions, since two different parameter types may be unified to the same type
957	std::set< std::string > adaptersDone;
958
959	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
960	FunctionType originalFunction = (funType)->clone();
961	FunctionType realFunction = (funType)->clone();
962	std::string mangleName = SymTab::Mangler::mangle( realFunction );
963
964	// only attempt to create an adapter or pass one as a parameter if we haven't already done so for this
965	// pre-substitution parameter function type.
966	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
967	adaptersDone.insert( adaptersDone.begin(), mangleName );
968
969	// apply substitution to type variables to figure out what the adapter's type should look like
970	assert( env );
971	env->apply( realFunction );
972	mangleName = SymTab::Mangler::mangle( realFunction );
973	mangleName += makePolyMonoSuffix( originalFunction, exprTyVars );
974
975	AdapterMap & adapters = Pass1::adapters.top();
976	AdapterMap::iterator adapter = adapters.find( mangleName );
977	if ( adapter == adapters.end() ) {
978	// adapter has not been created yet in the current scope, so define it
979	FunctionDecl newAdapter = makeAdapter( funType, realFunction, mangleName, exprTyVars );
980	adapter = adapters.insert( adapters.begin(), std::pair< std::string, DeclarationWithType *>( mangleName, newAdapter ) );
981	stmtsToAdd.push_back( new DeclStmt( noLabels, newAdapter ) );
982	} // if
983	assert( adapter != adapters.end() );
984
985	// add the appropriate adapter as a parameter
986	appExpr->get_args().push_front( new VariableExpr( adapter->second ) );
987	} // if
988	} // for
989	} // passAdapters
990
991	Expression makeIncrDecrExpr( ApplicationExpr appExpr, Type *polyType, bool isIncr ) {
992	NameExpr *opExpr;
993	if ( isIncr ) {
994	opExpr = new NameExpr( "?+=?" );
995	} else {
996	opExpr = new NameExpr( "?-=?" );
997	} // if
998	UntypedExpr *addAssign = new UntypedExpr( opExpr );
999	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
1000	addAssign->get_args().push_back( address->get_arg() );
1001	} else {
1002	addAssign->get_args().push_back( appExpr->get_args().front() );
1003	} // if
1004	addAssign->get_args().push_back( new NameExpr( sizeofName( polyType ) ) );
1005	addAssign->get_results().front() = appExpr->get_results().front()->clone();
1006	if ( appExpr->get_env() ) {
1007	addAssign->set_env( appExpr->get_env() );
1008	appExpr->set_env( 0 );
1009	} // if
1010	appExpr->get_args().clear();
1011	delete appExpr;
1012	return addAssign;
1013	}
1014
1015	Expression Pass1::handleIntrinsics( ApplicationExpr appExpr ) {
1016	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( appExpr->get_function() ) ) {
1017	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic ) {
1018	if ( varExpr->get_var()->get_name() == "?[?]" ) {
1019	assert( ! appExpr->get_results().empty() );
1020	assert( appExpr->get_args().size() == 2 );
1021	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
1022	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
1023	assert( ! baseType1 \|\| ! baseType2 ); // the arguments cannot both be polymorphic pointers
1024	UntypedExpr *ret = 0;
1025	if ( baseType1 \|\| baseType2 ) { // one of the arguments is a polymorphic pointer
1026	ret = new UntypedExpr( new NameExpr( "?+?" ) );
1027	} // if
1028	if ( baseType1 ) {
1029	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1030	multiply->get_args().push_back( appExpr->get_args().back() );
1031	multiply->get_args().push_back( new NameExpr( sizeofName( baseType1 ) ) );
1032	ret->get_args().push_back( appExpr->get_args().front() );
1033	ret->get_args().push_back( multiply );
1034	} else if ( baseType2 ) {
1035	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1036	multiply->get_args().push_back( appExpr->get_args().front() );
1037	multiply->get_args().push_back( new NameExpr( sizeofName( baseType2 ) ) );
1038	ret->get_args().push_back( multiply );
1039	ret->get_args().push_back( appExpr->get_args().back() );
1040	} // if
1041	if ( baseType1 \|\| baseType2 ) {
1042	ret->get_results().push_front( appExpr->get_results().front()->clone() );
1043	if ( appExpr->get_env() ) {
1044	ret->set_env( appExpr->get_env() );
1045	appExpr->set_env( 0 );
1046	} // if
1047	appExpr->get_args().clear();
1048	delete appExpr;
1049	return ret;
1050	} // if
1051	} else if ( varExpr->get_var()->get_name() == "*?" ) {
1052	assert( ! appExpr->get_results().empty() );
1053	assert( ! appExpr->get_args().empty() );
1054	if ( isPolyType( appExpr->get_results().front(), scopeTyVars, env ) ) {
1055	Expression *ret = appExpr->get_args().front();
1056	delete ret->get_results().front();
1057	ret->get_results().front() = appExpr->get_results().front()->clone();
1058	if ( appExpr->get_env() ) {
1059	ret->set_env( appExpr->get_env() );
1060	appExpr->set_env( 0 );
1061	} // if
1062	appExpr->get_args().clear();
1063	delete appExpr;
1064	return ret;
1065	} // if
1066	} else if ( varExpr->get_var()->get_name() == "?++" \|\| varExpr->get_var()->get_name() == "?--" ) {
1067	assert( ! appExpr->get_results().empty() );
1068	assert( appExpr->get_args().size() == 1 );
1069	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
1070	Type *tempType = appExpr->get_results().front()->clone();
1071	if ( env ) {
1072	env->apply( tempType );
1073	} // if
1074	ObjectDecl *newObj = makeTemporary( tempType );
1075	VariableExpr *tempExpr = new VariableExpr( newObj );
1076	UntypedExpr *assignExpr = new UntypedExpr( new NameExpr( "?=?" ) );
1077	assignExpr->get_args().push_back( tempExpr->clone() );
1078	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
1079	assignExpr->get_args().push_back( address->get_arg()->clone() );
1080	} else {
1081	assignExpr->get_args().push_back( appExpr->get_args().front()->clone() );
1082	} // if
1083	CommaExpr *firstComma = new CommaExpr( assignExpr, makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "?++" ) );
1084	return new CommaExpr( firstComma, tempExpr );
1085	} // if
1086	} else if ( varExpr->get_var()->get_name() == "++?" \|\| varExpr->get_var()->get_name() == "--?" ) {
1087	assert( ! appExpr->get_results().empty() );
1088	assert( appExpr->get_args().size() == 1 );
1089	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
1090	return makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "++?" );
1091	} // if
1092	} else if ( varExpr->get_var()->get_name() == "?+?" \|\| varExpr->get_var()->get_name() == "?-?" ) {
1093	assert( ! appExpr->get_results().empty() );
1094	assert( appExpr->get_args().size() == 2 );
1095	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
1096	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
1097	if ( baseType1 && baseType2 ) {
1098	UntypedExpr *divide = new UntypedExpr( new NameExpr( "?/?" ) );
1099	divide->get_args().push_back( appExpr );
1100	divide->get_args().push_back( new NameExpr( sizeofName( baseType1 ) ) );
1101	divide->get_results().push_front( appExpr->get_results().front()->clone() );
1102	if ( appExpr->get_env() ) {
1103	divide->set_env( appExpr->get_env() );
1104	appExpr->set_env( 0 );
1105	} // if
1106	return divide;
1107	} else if ( baseType1 ) {
1108	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1109	multiply->get_args().push_back( appExpr->get_args().back() );
1110	multiply->get_args().push_back( new NameExpr( sizeofName( baseType1 ) ) );
1111	appExpr->get_args().back() = multiply;
1112	} else if ( baseType2 ) {
1113	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1114	multiply->get_args().push_back( appExpr->get_args().front() );
1115	multiply->get_args().push_back( new NameExpr( sizeofName( baseType2 ) ) );
1116	appExpr->get_args().front() = multiply;
1117	} // if
1118	} else if ( varExpr->get_var()->get_name() == "?+=?" \|\| varExpr->get_var()->get_name() == "?-=?" ) {
1119	assert( ! appExpr->get_results().empty() );
1120	assert( appExpr->get_args().size() == 2 );
1121	Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env );
1122	if ( baseType ) {
1123	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1124	multiply->get_args().push_back( appExpr->get_args().back() );
1125	multiply->get_args().push_back( new NameExpr( sizeofName( baseType ) ) );
1126	appExpr->get_args().back() = multiply;
1127	} // if
1128	} // if
1129	return appExpr;
1130	} // if
1131	} // if
1132	return 0;
1133	}
1134
1135	Expression Pass1::mutate( ApplicationExpr appExpr ) {
1136	// std::cerr << "mutate appExpr: ";
1137	// for ( TyVarMap::iterator i = scopeTyVars.begin(); i != scopeTyVars.end(); ++i ) {
1138	// std::cerr << i->first << " ";
1139	// }
1140	// std::cerr << "\n";
1141	bool oldUseRetval = useRetval;
1142	useRetval = false;
1143	appExpr->get_function()->acceptMutator( *this );
1144	mutateAll( appExpr->get_args(), *this );
1145	useRetval = oldUseRetval;
1146
1147	assert( ! appExpr->get_function()->get_results().empty() );
1148	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
1149	assert( pointer );
1150	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
1151	assert( function );
1152
1153	if ( Expression *newExpr = handleIntrinsics( appExpr ) ) {
1154	return newExpr;
1155	} // if
1156
1157	Expression *ret = appExpr;
1158
1159	std::list< Expression *>::iterator arg = appExpr->get_args().begin();
1160	std::list< Expression *>::iterator paramBegin = appExpr->get_args().begin();
1161
1162	TyVarMap exprTyVars;
1163	makeTyVarMap( function, exprTyVars );
1164	ReferenceToType *polyRetType = isPolyRet( function );
1165
1166	if ( polyRetType ) {
1167	ret = addPolyRetParam( appExpr, function, polyRetType, arg );
1168	} else if ( needsAdapter( function, scopeTyVars ) ) {
1169	// std::cerr << "needs adapter: ";
1170	// for ( TyVarMap::iterator i = scopeTyVars.begin(); i != scopeTyVars.end(); ++i ) {
1171	// std::cerr << i->first << " ";
1172	// }
1173	// std::cerr << "\n";
1174	// change the application so it calls the adapter rather than the passed function
1175	ret = applyAdapter( appExpr, function, arg, scopeTyVars );
1176	} // if
1177	arg = appExpr->get_args().begin();
1178
1179	passTypeVars( appExpr, polyRetType, arg, exprTyVars );
1180	addInferredParams( appExpr, function, arg, exprTyVars );
1181
1182	arg = paramBegin;
1183
1184	boxParams( appExpr, function, arg, exprTyVars );
1185
1186	passAdapters( appExpr, function, exprTyVars );
1187
1188	return ret;
1189	}
1190
1191	Expression Pass1::mutate( UntypedExpr expr ) {
1192	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
1193	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
1194	if ( name->get_name() == "*?" ) {
1195	Expression *ret = expr->get_args().front();
1196	expr->get_args().clear();
1197	delete expr;
1198	return ret->acceptMutator( *this );
1199	} // if
1200	} // if
1201	} // if
1202	return PolyMutator::mutate( expr );
1203	}
1204
1205	Expression Pass1::mutate( AddressExpr addrExpr ) {
1206	assert( ! addrExpr->get_arg()->get_results().empty() );
1207
1208	bool needs = false;
1209	if ( UntypedExpr expr = dynamic_cast< UntypedExpr >( addrExpr->get_arg() ) ) {
1210	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
1211	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
1212	if ( name->get_name() == "*?" ) {
1213	if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr->get_args().front() ) ) {
1214	assert( ! appExpr->get_function()->get_results().empty() );
1215	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
1216	assert( pointer );
1217	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
1218	assert( function );
1219	needs = needsAdapter( function, scopeTyVars );
1220	} // if
1221	} // if
1222	} // if
1223	} // if
1224	} // if
1225	addrExpr->set_arg( mutateExpression( addrExpr->get_arg() ) );
1226	if ( isPolyType( addrExpr->get_arg()->get_results().front(), scopeTyVars, env ) \|\| needs ) {
1227	Expression *ret = addrExpr->get_arg();
1228	delete ret->get_results().front();
1229	ret->get_results().front() = addrExpr->get_results().front()->clone();
1230	addrExpr->set_arg( 0 );
1231	delete addrExpr;
1232	return ret;
1233	} else {
1234	return addrExpr;
1235	} // if
1236	}
1237
1238	/// Wraps a function declaration in a new pointer-to-function variable expression
1239	VariableExpr wrapFunctionDecl( DeclarationWithType functionDecl ) {
1240	// line below cloned from FixFunction.cc
1241	ObjectDecl *functionObj = new ObjectDecl( functionDecl->get_name(), functionDecl->get_storageClass(), functionDecl->get_linkage(), 0,
1242	new PointerType( Type::Qualifiers(), functionDecl->get_type()->clone() ), 0 );
1243	functionObj->set_mangleName( functionDecl->get_mangleName() );
1244	return new VariableExpr( functionObj );
1245	}
1246
1247	Statement * Pass1::mutate( ReturnStmt *returnStmt ) {
1248	if ( retval && returnStmt->get_expr() ) {
1249	assert( ! returnStmt->get_expr()->get_results().empty() );
1250	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
1251	// if ( returnStmt->get_expr()->get_results().front()->get_isLvalue() ) {
1252	// by this point, a cast expr on a polymorphic return value is redundant
1253	while ( CastExpr castExpr = dynamic_cast< CastExpr >( returnStmt->get_expr() ) ) {
1254	returnStmt->set_expr( castExpr->get_arg() );
1255	returnStmt->get_expr()->set_env( castExpr->get_env() );
1256	castExpr->set_env( 0 );
1257	castExpr->set_arg( 0 );
1258	delete castExpr;
1259	} //while
1260
1261	// find assignment operator for (polymorphic) return type
1262	ApplicationExpr *assignExpr = 0;
1263	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( retval->get_type() ) ) {
1264	// find assignment operator for type variable
1265	std::map< std::string, DeclarationWithType *>::const_iterator assignIter = assignOps.find( typeInst->get_name() );
1266	if ( assignIter == assignOps.end() ) {
1267	throw SemanticError( "Attempt to return dtype or ftype object in ", returnStmt->get_expr() );
1268	} // if
1269	assignExpr = new ApplicationExpr( new VariableExpr( assignIter->second ) );
1270	} else if ( ReferenceToType refType = dynamic_cast< ReferenceToType >( retval->get_type() ) ) {
1271	// find assignment operator for generic type
1272	DeclarationWithType *functionDecl = scopedAssignOps.find( refType );
1273	if ( ! functionDecl ) {
1274	throw SemanticError( "Attempt to return dtype or ftype generic object in ", returnStmt->get_expr() );
1275	}
1276
1277	// wrap it up in an application expression
1278	assignExpr = new ApplicationExpr( wrapFunctionDecl( functionDecl ) );
1279	assignExpr->set_env( env->clone() );
1280
1281	// find each of its needed secondary assignment operators
1282	std::list< Expression* > &tyParams = refType->get_parameters();
1283	std::list< TypeDecl* > &forallParams = functionDecl->get_type()->get_forall();
1284	std::list< Expression* >::const_iterator tyIt = tyParams.begin();
1285	std::list< TypeDecl* >::const_iterator forallIt = forallParams.begin();
1286	for ( ; tyIt != tyParams.end() && forallIt != forallParams.end(); ++tyIt, ++forallIt ) {
1287	if ( (*forallIt)->get_kind() != TypeDecl::Any ) continue; // skip types with no assign op (ftype/dtype)
1288
1289	std::list< DeclarationWithType* > &asserts = (*forallIt)->get_assertions();
1290	assert( ! asserts.empty() && "Type param needs assignment operator assertion" );
1291	DeclarationWithType *actualDecl = asserts.front();
1292	TypeInstType *actualType = isTypeInstAssignment( actualDecl );
1293	assert( actualType && "First assertion of type with assertions should be assignment operator" );
1294	TypeExpr formalTypeExpr = dynamic_cast< TypeExpr >( *tyIt );
1295	assert( formalTypeExpr && "type parameters must be type expressions" );
1296	Type *formalType = formalTypeExpr->get_type();
1297	assignExpr->get_env()->add( actualType->get_name(), formalType );
1298
1299	DeclarationWithType *assertAssign = 0;
1300	if ( TypeInstType formalTypeInstType = dynamic_cast< TypeInstType >( formalType ) ) {
1301	std::map< std::string, DeclarationWithType *>::const_iterator assertAssignIt = assignOps.find( formalTypeInstType->get_name() );
1302	if ( assertAssignIt == assignOps.end() ) {
1303	throw SemanticError( "No assignment operation found for ", formalTypeInstType );
1304	}
1305	assertAssign = assertAssignIt->second;
1306	} else {
1307	assertAssign = scopedAssignOps.find( formalType );
1308	if ( ! assertAssign ) {
1309	throw SemanticError( "No assignment operation found for ", formalType );
1310	}
1311	}
1312
1313
1314	assignExpr->get_inferParams()[ actualDecl->get_uniqueId() ]
1315	= ParamEntry( assertAssign->get_uniqueId(), assertAssign->get_type()->clone(), actualDecl->get_type()->clone(), wrapFunctionDecl( assertAssign ) );
1316	}
1317	}
1318	assert( assignExpr );
1319
1320	// replace return statement with appropriate assignment to out parameter
1321	Expression *retParm = new NameExpr( retval->get_name() );
1322	retParm->get_results().push_back( new PointerType( Type::Qualifiers(), retval->get_type()->clone() ) );
1323	assignExpr->get_args().push_back( retParm );
1324	assignExpr->get_args().push_back( returnStmt->get_expr() );
1325	stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( assignExpr ) ) );
1326	// } else {
1327	// useRetval = true;
1328	// stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( returnStmt->get_expr() ) ) );
1329	// useRetval = false;
1330	// } // if
1331	returnStmt->set_expr( 0 );
1332	} else {
1333	returnStmt->set_expr( mutateExpression( returnStmt->get_expr() ) );
1334	} // if
1335	return returnStmt;
1336	}
1337
1338	Type * Pass1::mutate( PointerType *pointerType ) {
1339	TyVarMap oldtyVars = scopeTyVars;
1340	makeTyVarMap( pointerType, scopeTyVars );
1341
1342	Type *ret = Mutator::mutate( pointerType );
1343
1344	scopeTyVars = oldtyVars;
1345	return ret;
1346	}
1347
1348	Type * Pass1::mutate( FunctionType *functionType ) {
1349	TyVarMap oldtyVars = scopeTyVars;
1350	makeTyVarMap( functionType, scopeTyVars );
1351
1352	Type *ret = Mutator::mutate( functionType );
1353
1354	scopeTyVars = oldtyVars;
1355	return ret;
1356	}
1357
1358	void Pass1::doBeginScope() {
1359	// push a copy of the current map
1360	adapters.push(adapters.top());
1361	scopedAssignOps.beginScope();
1362	}
1363
1364	void Pass1::doEndScope() {
1365	adapters.pop();
1366	scopedAssignOps.endScope();
1367	}
1368
1369	////////////////////////////////////////// Pass2 ////////////////////////////////////////////////////
1370
1371	void Pass2::addAdapters( FunctionType *functionType ) {
1372	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
1373	std::list< FunctionType *> functions;
1374	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
1375	Type orig = (arg)->get_type();
1376	findAndReplaceFunction( orig, functions, scopeTyVars, needsAdapter );
1377	(*arg)->set_type( orig );
1378	}
1379	std::set< std::string > adaptersDone;
1380	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
1381	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
1382	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
1383	std::string adapterName = makeAdapterName( mangleName );
1384	paramList.push_front( new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( *funType, scopeTyVars ) ), 0 ) );
1385	adaptersDone.insert( adaptersDone.begin(), mangleName );
1386	}
1387	}
1388	// deleteAll( functions );
1389	}
1390
1391	template< typename DeclClass >
1392	DeclClass * Pass2::handleDecl( DeclClass decl, Type type ) {
1393	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
1394
1395	return ret;
1396	}
1397
1398	DeclarationWithType * Pass2::mutate( FunctionDecl *functionDecl ) {
1399	return handleDecl( functionDecl, functionDecl->get_functionType() );
1400	}
1401
1402	ObjectDecl * Pass2::mutate( ObjectDecl *objectDecl ) {
1403	return handleDecl( objectDecl, objectDecl->get_type() );
1404	}
1405
1406	TypeDecl * Pass2::mutate( TypeDecl *typeDecl ) {
1407	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1408	if ( typeDecl->get_base() ) {
1409	return handleDecl( typeDecl, typeDecl->get_base() );
1410	} else {
1411	return Mutator::mutate( typeDecl );
1412	}
1413	}
1414
1415	TypedefDecl * Pass2::mutate( TypedefDecl *typedefDecl ) {
1416	return handleDecl( typedefDecl, typedefDecl->get_base() );
1417	}
1418
1419	Type * Pass2::mutate( PointerType *pointerType ) {
1420	TyVarMap oldtyVars = scopeTyVars;
1421	makeTyVarMap( pointerType, scopeTyVars );
1422
1423	Type *ret = Mutator::mutate( pointerType );
1424
1425	scopeTyVars = oldtyVars;
1426	return ret;
1427	}
1428
1429	Type Pass2::mutate( FunctionType funcType ) {
1430	TyVarMap oldtyVars = scopeTyVars;
1431	makeTyVarMap( funcType, scopeTyVars );
1432
1433	// move polymorphic return type to parameter list
1434	if ( isPolyRet( funcType ) ) {
1435	DeclarationWithType *ret = funcType->get_returnVals().front();
1436	ret->set_type( new PointerType( Type::Qualifiers(), ret->get_type() ) );
1437	funcType->get_parameters().push_front( ret );
1438	funcType->get_returnVals().pop_front();
1439	}
1440
1441	// add size/align and assertions for type parameters to parameter list
1442	std::list< DeclarationWithType *>::iterator last = funcType->get_parameters().begin();
1443	std::list< DeclarationWithType *> inferredParams;
1444	ObjectDecl newObj( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), 0 );
1445	ObjectDecl newPtr( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0,
1446	new PointerType( Type::Qualifiers(), new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) ), 0 );
1447	// ObjectDecl *newFunPtr = new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) ), 0 );
1448	for ( std::list< TypeDecl *>::const_iterator tyParm = funcType->get_forall().begin(); tyParm != funcType->get_forall().end(); ++tyParm ) {
1449	ObjectDecl sizeParm, alignParm;
1450	// add all size and alignment parameters to parameter list
1451	if ( (*tyParm)->get_kind() == TypeDecl::Any ) {
1452	TypeInstType parmType( Type::Qualifiers(), (tyParm)->get_name(), tyParm );
1453
1454	sizeParm = newObj.clone();
1455	sizeParm->set_name( sizeofName( &parmType ) );
1456	last = funcType->get_parameters().insert( last, sizeParm );
1457	++last;
1458
1459	alignParm = newObj.clone();
1460	alignParm->set_name( alignofName( &parmType ) );
1461	last = funcType->get_parameters().insert( last, alignParm );
1462	++last;
1463	}
1464	// move all assertions into parameter list
1465	for ( std::list< DeclarationWithType >::iterator assert = (tyParm)->get_assertions().begin(); assert != (*tyParm)->get_assertions().end(); ++assert ) {
1466	// assert = (assert)->acceptMutator( *this );
1467	inferredParams.push_back( *assert );
1468	}
1469	(*tyParm)->get_assertions().clear();
1470	}
1471
1472	// add size/align for generic parameter types to parameter list
1473	std::set< std::string > seenTypes; // sizeofName for generic types we've seen
1474	for ( std::list< DeclarationWithType* >::const_iterator fnParm = last; fnParm != funcType->get_parameters().end(); ++fnParm ) {
1475	Type polyBase = hasPolyBase( (fnParm)->get_type(), scopeTyVars );
1476	if ( polyBase && ! dynamic_cast< TypeInstType* >( polyBase ) ) {
1477	std::string sizeName = sizeofName( polyBase );
1478	if ( seenTypes.count( sizeName ) ) continue;
1479
1480	ObjectDecl sizeParm, alignParm, *offsetParm;
1481	sizeParm = newObj.clone();
1482	sizeParm->set_name( sizeName );
1483	last = funcType->get_parameters().insert( last, sizeParm );
1484	++last;
1485
1486	alignParm = newObj.clone();
1487	alignParm->set_name( alignofName( polyBase ) );
1488	last = funcType->get_parameters().insert( last, alignParm );
1489	++last;
1490
1491	if ( dynamic_cast< StructInstType* >( polyBase ) ) {
1492	offsetParm = newPtr.clone();
1493	offsetParm->set_name( offsetofName( polyBase ) );
1494	last = funcType->get_parameters().insert( last, offsetParm );
1495	++last;
1496	}
1497
1498	seenTypes.insert( sizeName );
1499	}
1500	}
1501
1502	// splice assertion parameters into parameter list
1503	funcType->get_parameters().splice( last, inferredParams );
1504	addAdapters( funcType );
1505	mutateAll( funcType->get_returnVals(), *this );
1506	mutateAll( funcType->get_parameters(), *this );
1507
1508	scopeTyVars = oldtyVars;
1509	return funcType;
1510	}
1511
1512	////////////////////////////////////////// MemberExprFixer ////////////////////////////////////////////////////
1513
1514	template< typename DeclClass >
1515	DeclClass * MemberExprFixer::handleDecl( DeclClass decl, Type type ) {
1516	TyVarMap oldtyVars = scopeTyVars;
1517	makeTyVarMap( type, scopeTyVars );
1518
1519	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
1520
1521	scopeTyVars = oldtyVars;
1522	return ret;
1523	}
1524
1525	ObjectDecl * MemberExprFixer::mutate( ObjectDecl *objectDecl ) {
1526	return handleDecl( objectDecl, objectDecl->get_type() );
1527	}
1528
1529	DeclarationWithType * MemberExprFixer::mutate( FunctionDecl *functionDecl ) {
1530	return handleDecl( functionDecl, functionDecl->get_functionType() );
1531	}
1532
1533	TypedefDecl * MemberExprFixer::mutate( TypedefDecl *typedefDecl ) {
1534	return handleDecl( typedefDecl, typedefDecl->get_base() );
1535	}
1536
1537	TypeDecl * MemberExprFixer::mutate( TypeDecl *typeDecl ) {
1538	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1539	return Mutator::mutate( typeDecl );
1540	}
1541
1542	Type * MemberExprFixer::mutate( PointerType *pointerType ) {
1543	TyVarMap oldtyVars = scopeTyVars;
1544	makeTyVarMap( pointerType, scopeTyVars );
1545
1546	Type *ret = Mutator::mutate( pointerType );
1547
1548	scopeTyVars = oldtyVars;
1549	return ret;
1550	}
1551
1552	Type * MemberExprFixer::mutate( FunctionType *functionType ) {
1553	TyVarMap oldtyVars = scopeTyVars;
1554	makeTyVarMap( functionType, scopeTyVars );
1555
1556	Type *ret = Mutator::mutate( functionType );
1557
1558	scopeTyVars = oldtyVars;
1559	return ret;
1560	}
1561
1562	Statement MemberExprFixer::mutate( DeclStmt declStmt ) {
1563	if ( ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( declStmt->get_decl() ) ) {
1564	if ( isPolyType( objectDecl->get_type(), scopeTyVars ) ) {
1565	// change initialization of a polymorphic value object
1566	// to allocate storage with alloca
1567	Type *declType = objectDecl->get_type();
1568	UntypedExpr *alloc = new UntypedExpr( new NameExpr( "__builtin_alloca" ) );
1569	alloc->get_args().push_back( new NameExpr( sizeofName( declType ) ) );
1570
1571	delete objectDecl->get_init();
1572
1573	std::list<Expression*> designators;
1574	objectDecl->set_init( new SingleInit( alloc, designators ) );
1575	}
1576	}
1577	return Mutator::mutate( declStmt );
1578	}
1579
1580	/// Finds the member in the base list that matches the given declaration; returns its index, or -1 if not present
1581	long findMember( DeclarationWithType memberDecl, std::list< Declaration > &baseDecls ) {
1582	long i = 0;
1583	for(std::list< Declaration* >::const_iterator decl = baseDecls.begin(); decl != baseDecls.end(); ++decl, ++i ) {
1584	if ( memberDecl->get_name() != (*decl)->get_name() ) continue;
1585
1586	if ( DeclarationWithType declWithType = dynamic_cast< DeclarationWithType >( *decl ) ) {
1587	if ( memberDecl->get_mangleName().empty() \|\| declWithType->get_mangleName().empty()
1588	\|\| memberDecl->get_mangleName() == declWithType->get_mangleName() ) return i;
1589	else continue;
1590	} else return i;
1591	}
1592	return -1;
1593	}
1594
1595	/// Returns an index expression into the offset array for a type
1596	Expression makeOffsetIndex( Type objectType, long i ) {
1597	std::stringstream offset_namer;
1598	offset_namer << i;
1599	ConstantExpr *fieldIndex = new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), offset_namer.str() ) );
1600	UntypedExpr *fieldOffset = new UntypedExpr( new NameExpr( "?[?]" ) );
1601	fieldOffset->get_args().push_back( new NameExpr( offsetofName( objectType ) ) );
1602	fieldOffset->get_args().push_back( fieldIndex );
1603	return fieldOffset;
1604	}
1605
1606	/// Returns an expression dereferenced n times
1607	Expression makeDerefdVar( Expression derefdVar, long n ) {
1608	for ( int i = 1; i < n; ++i ) {
1609	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
1610	derefExpr->get_args().push_back( derefdVar );
1611	derefdVar = derefExpr;
1612	}
1613	return derefdVar;
1614	}
1615
1616	Expression MemberExprFixer::mutate( MemberExpr memberExpr ) {
1617	// mutate, exiting early if no longer MemberExpr
1618	Expression *expr = Mutator::mutate( memberExpr );
1619	memberExpr = dynamic_cast< MemberExpr* >( expr );
1620	if ( ! memberExpr ) return expr;
1621
1622	// get declaration for base struct, exiting early if not found
1623	int varDepth;
1624	VariableExpr *varExpr = getBaseVar( memberExpr->get_aggregate(), &varDepth );
1625	if ( ! varExpr ) return memberExpr;
1626	ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( varExpr->get_var() );
1627	if ( ! objectDecl ) return memberExpr;
1628
1629	// only mutate member expressions for polymorphic types
1630	int tyDepth;
1631	Type *objectType = hasPolyBase( objectDecl->get_type(), scopeTyVars, &tyDepth );
1632	if ( ! objectType ) return memberExpr;
1633
1634	Expression *newMemberExpr = 0;
1635	if ( StructInstType structType = dynamic_cast< StructInstType >( objectType ) ) {
1636	// look up offset index
1637	long i = findMember( memberExpr->get_member(), structType->get_baseStruct()->get_members() );
1638	if ( i == -1 ) return memberExpr;
1639
1640	// replace member expression with pointer to base plus offset
1641	UntypedExpr *fieldLoc = new UntypedExpr( new NameExpr( "?+?" ) );
1642	fieldLoc->get_args().push_back( makeDerefdVar( varExpr->clone(), varDepth ) );
1643	fieldLoc->get_args().push_back( makeOffsetIndex( objectType, i ) );
1644	newMemberExpr = fieldLoc;
1645	} else if ( dynamic_cast< UnionInstType* >( objectType ) ) {
1646	// union members are all at offset zero, so build appropriately-dereferenced variable
1647	newMemberExpr = makeDerefdVar( varExpr->clone(), varDepth );
1648	} else return memberExpr;
1649	assert( newMemberExpr );
1650
1651	Type *memberType = memberExpr->get_member()->get_type();
1652	if ( ! isPolyType( memberType, scopeTyVars ) ) {
1653	// 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
1654	CastExpr *ptrCastExpr = new CastExpr( newMemberExpr, new PointerType( Type::Qualifiers(), memberType->clone() ) );
1655	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
1656	derefExpr->get_args().push_back( ptrCastExpr );
1657	newMemberExpr = derefExpr;
1658	}
1659
1660	delete memberExpr;
1661	return newMemberExpr;
1662	}
1663
1664	Expression MemberExprFixer::mutate( OffsetofExpr offsetofExpr ) {
1665	// mutate, exiting early if no longer OffsetofExpr
1666	Expression *expr = Mutator::mutate( offsetofExpr );
1667	offsetofExpr = dynamic_cast< OffsetofExpr* >( expr );
1668	if ( ! offsetofExpr ) return expr;
1669
1670	// only mutate expressions for polymorphic structs/unions
1671	Type *ty = isPolyType( offsetofExpr->get_type(), scopeTyVars );
1672	if ( ! ty ) return offsetofExpr;
1673
1674	if ( StructInstType structType = dynamic_cast< StructInstType >( ty ) ) {
1675	// replace offsetof expression by index into offset array
1676	long i = findMember( offsetofExpr->get_member(), structType->get_baseStruct()->get_members() );
1677	if ( i == -1 ) return offsetofExpr;
1678
1679	Expression *offsetInd = makeOffsetIndex( ty, i );
1680	delete offsetofExpr;
1681	return offsetInd;
1682	} else if ( dynamic_cast< UnionInstType* >( ty ) ) {
1683	// all union members are at offset zero
1684	delete offsetofExpr;
1685	return new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), std::string("0") ) );
1686	} else return offsetofExpr;
1687	}
1688
1689	////////////////////////////////////////// Pass3 ////////////////////////////////////////////////////
1690
1691	template< typename DeclClass >
1692	DeclClass * Pass3::handleDecl( DeclClass decl, Type type ) {
1693	TyVarMap oldtyVars = scopeTyVars;
1694	makeTyVarMap( type, scopeTyVars );
1695
1696	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
1697	ScrubTyVars::scrub( decl, scopeTyVars );
1698
1699	scopeTyVars = oldtyVars;
1700	return ret;
1701	}
1702
1703	ObjectDecl * Pass3::mutate( ObjectDecl *objectDecl ) {
1704	return handleDecl( objectDecl, objectDecl->get_type() );
1705	}
1706
1707	DeclarationWithType * Pass3::mutate( FunctionDecl *functionDecl ) {
1708	return handleDecl( functionDecl, functionDecl->get_functionType() );
1709	}
1710
1711	TypedefDecl * Pass3::mutate( TypedefDecl *typedefDecl ) {
1712	return handleDecl( typedefDecl, typedefDecl->get_base() );
1713	}
1714
1715	TypeDecl * Pass3::mutate( TypeDecl *typeDecl ) {
1716	// Initializer *init = 0;
1717	// std::list< Expression *> designators;
1718	// scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1719	// if ( typeDecl->get_base() ) {
1720	// init = new SimpleInit( new SizeofExpr( handleDecl( typeDecl, typeDecl->get_base() ) ), designators );
1721	// }
1722	// return new ObjectDecl( typeDecl->get_name(), Declaration::Extern, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::UnsignedInt ), init );
1723
1724	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1725	return Mutator::mutate( typeDecl );
1726	}
1727
1728	Type * Pass3::mutate( PointerType *pointerType ) {
1729	TyVarMap oldtyVars = scopeTyVars;
1730	makeTyVarMap( pointerType, scopeTyVars );
1731
1732	Type *ret = Mutator::mutate( pointerType );
1733
1734	scopeTyVars = oldtyVars;
1735	return ret;
1736	}
1737
1738	Type * Pass3::mutate( FunctionType *functionType ) {
1739	TyVarMap oldtyVars = scopeTyVars;
1740	makeTyVarMap( functionType, scopeTyVars );
1741
1742	Type *ret = Mutator::mutate( functionType );
1743
1744	scopeTyVars = oldtyVars;
1745	return ret;
1746	}
1747	} // anonymous namespace
1748	} // namespace GenPoly
1749
1750	// Local Variables: //
1751	// tab-width: 4 //
1752	// mode: c++ //
1753	// compile-command: "make install" //
1754	// End: //

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