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source: src/GenPoly/Box.cc @ 04273e9

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

Last change on this file since 04273e9 was ea5daeb, checked in by Aaron Moss <a3moss@…>, 8 years ago
Move generic instantiation earlier
Property mode set to `100644`
File size: 96.2 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 : Wed Jun 29 21:43:03 2016
13	// Update Count : 296
14	//
15
16	#include <algorithm>
17	#include <iterator>
18	#include <list>
19	#include <map>
20	#include <set>
21	#include <stack>
22	#include <string>
23	#include <utility>
24	#include <vector>
25	#include <cassert>
26
27	#include "Box.h"
28	#include "DeclMutator.h"
29	#include "PolyMutator.h"
30	#include "FindFunction.h"
31	#include "ScopedMap.h"
32	#include "ScopedSet.h"
33	#include "ScrubTyVars.h"
34
35	#include "Parser/ParseNode.h"
36
37	#include "SynTree/Constant.h"
38	#include "SynTree/Declaration.h"
39	#include "SynTree/Expression.h"
40	#include "SynTree/Initializer.h"
41	#include "SynTree/Mutator.h"
42	#include "SynTree/Statement.h"
43	#include "SynTree/Type.h"
44	#include "SynTree/TypeSubstitution.h"
45
46	#include "ResolvExpr/TypeEnvironment.h"
47	#include "ResolvExpr/TypeMap.h"
48	#include "ResolvExpr/typeops.h"
49
50	#include "SymTab/Indexer.h"
51	#include "SymTab/Mangler.h"
52
53	#include "Common/SemanticError.h"
54	#include "Common/UniqueName.h"
55	#include "Common/utility.h"
56
57	#include <ext/functional> // temporary
58
59	namespace GenPoly {
60	namespace {
61	const std::list<Label> noLabels;
62
63	FunctionType makeAdapterType( FunctionType adaptee, const TyVarMap &tyVars );
64
65	/// Adds layout-generation functions to polymorphic types
66	class LayoutFunctionBuilder : public DeclMutator {
67	unsigned int functionNesting; // current level of nested functions
68	public:
69	LayoutFunctionBuilder() : functionNesting( 0 ) {}
70
71	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
72	virtual Declaration mutate( StructDecl structDecl );
73	virtual Declaration mutate( UnionDecl unionDecl );
74	};
75
76	/// 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
77	class Pass1 : public PolyMutator {
78	public:
79	Pass1();
80	virtual Expression mutate( ApplicationExpr appExpr );
81	virtual Expression mutate( AddressExpr addrExpr );
82	virtual Expression mutate( UntypedExpr expr );
83	virtual DeclarationWithType* mutate( FunctionDecl *functionDecl );
84	virtual TypeDecl mutate( TypeDecl typeDecl );
85	virtual Expression mutate( CommaExpr commaExpr );
86	virtual Expression mutate( ConditionalExpr condExpr );
87	virtual Statement * mutate( ReturnStmt *returnStmt );
88	virtual Type mutate( PointerType pointerType );
89	virtual Type * mutate( FunctionType *functionType );
90
91	virtual void doBeginScope();
92	virtual void doEndScope();
93	private:
94	/// Pass the extra type parameters from polymorphic generic arguments or return types into a function application
95	void passArgTypeVars( ApplicationExpr appExpr, Type parmType, Type argBaseType, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars, std::set< std::string > &seenTypes );
96	/// passes extra type parameters into a polymorphic function application
97	void passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars );
98	/// wraps a function application with a new temporary for the out-parameter return value
99	Expression addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg );
100	/// Replaces all the type parameters of a generic type with their concrete equivalents under the current environment
101	void replaceParametersWithConcrete( ApplicationExpr appExpr, std::list< Expression >& params );
102	/// Replaces a polymorphic type with its concrete equivalant under the current environment (returns itself if concrete).
103	/// If `doClone` is set to false, will not clone interior types
104	Type replaceWithConcrete( ApplicationExpr appExpr, Type *type, bool doClone = true );
105	/// wraps a function application returning a polymorphic type with a new temporary for the out-parameter return value
106	Expression addPolyRetParam( ApplicationExpr appExpr, FunctionType function, ReferenceToType polyType, std::list< Expression *>::iterator &arg );
107	Expression applyAdapter( ApplicationExpr appExpr, FunctionType function, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars );
108	void boxParam( Type formal, Expression &arg, const TyVarMap &exprTyVars );
109	void boxParams( ApplicationExpr appExpr, FunctionType function, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars );
110	void addInferredParams( ApplicationExpr appExpr, FunctionType functionType, std::list< Expression *>::iterator &arg, const TyVarMap &tyVars );
111	/// Stores assignment operators from assertion list in local map of assignment operations
112	void findTypeOps( const std::list< TypeDecl *> &forall );
113	void passAdapters( ApplicationExpr appExpr, FunctionType functionType, const TyVarMap &exprTyVars );
114	FunctionDecl makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars );
115	/// Replaces intrinsic operator functions with their arithmetic desugaring
116	Expression handleIntrinsics( ApplicationExpr appExpr );
117	/// Inserts a new temporary variable into the current scope with an auto-generated name
118	ObjectDecl makeTemporary( Type type );
119
120	ScopedMap< std::string, DeclarationWithType* > assignOps; ///< Currently known type variable assignment operators
121	ScopedMap< std::string, DeclarationWithType* > ctorOps; ///< Currently known type variable constructors
122	ScopedMap< std::string, DeclarationWithType* > copyOps; ///< Currently known type variable copy constructors
123	ScopedMap< std::string, DeclarationWithType* > dtorOps; ///< Currently known type variable destructors
124	ResolvExpr::TypeMap< DeclarationWithType > scopedAssignOps; ///< Currently known assignment operators
125	ResolvExpr::TypeMap< DeclarationWithType > scopedCtorOps; ///< Currently known assignment operators
126	ResolvExpr::TypeMap< DeclarationWithType > scopedCopyOps; ///< Currently known assignment operators
127	ResolvExpr::TypeMap< DeclarationWithType > scopedDtorOps; ///< Currently known assignment operators
128	ScopedMap< std::string, DeclarationWithType* > adapters; ///< Set of adapter functions in the current scope
129
130	DeclarationWithType *retval;
131	bool useRetval;
132	UniqueName tempNamer;
133	};
134
135	/// * Moves polymorphic returns in function types to pointer-type parameters
136	/// * adds type size and assertion parameters to parameter lists
137	class Pass2 : public PolyMutator {
138	public:
139	template< typename DeclClass >
140	DeclClass handleDecl( DeclClass decl, Type *type );
141	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
142	virtual ObjectDecl mutate( ObjectDecl objectDecl );
143	virtual TypeDecl mutate( TypeDecl typeDecl );
144	virtual TypedefDecl mutate( TypedefDecl typedefDecl );
145	virtual Type mutate( PointerType pointerType );
146	virtual Type mutate( FunctionType funcType );
147
148	private:
149	void addAdapters( FunctionType *functionType );
150
151	std::map< UniqueId, std::string > adapterName;
152	};
153
154	/// Replaces member and size/align/offsetof expressions on polymorphic generic types with calculated expressions.
155	/// * Replaces member expressions for polymorphic types with calculated add-field-offset-and-dereference
156	/// * Calculates polymorphic offsetof expressions from offset array
157	/// * Inserts dynamic calculation of polymorphic type layouts where needed
158	class PolyGenericCalculator : 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 Statement mutate( DeclStmt declStmt );
167	virtual Type mutate( PointerType pointerType );
168	virtual Type mutate( FunctionType funcType );
169	virtual Expression mutate( MemberExpr memberExpr );
170	virtual Expression mutate( SizeofExpr sizeofExpr );
171	virtual Expression mutate( AlignofExpr alignofExpr );
172	virtual Expression mutate( OffsetofExpr offsetofExpr );
173	virtual Expression mutate( OffsetPackExpr offsetPackExpr );
174
175	virtual void doBeginScope();
176	virtual void doEndScope();
177
178	private:
179	/// Makes a new variable in the current scope with the given name, type & optional initializer
180	ObjectDecl makeVar( const std::string &name, Type type, Initializer *init = 0 );
181	/// returns true if the type has a dynamic layout; such a layout will be stored in appropriately-named local variables when the function returns
182	bool findGeneric( Type *ty );
183	/// adds type parameters to the layout call; will generate the appropriate parameters if needed
184	void addOtypeParamsToLayoutCall( UntypedExpr layoutCall, const std::list< Type > &otypeParams );
185
186	/// Enters a new scope for type-variables, adding the type variables from ty
187	void beginTypeScope( Type *ty );
188	/// Exits the type-variable scope
189	void endTypeScope();
190
191	ScopedSet< std::string > knownLayouts; ///< Set of generic type layouts known in the current scope, indexed by sizeofName
192	ScopedSet< std::string > knownOffsets; ///< Set of non-generic types for which the offset array exists in the current scope, indexed by offsetofName
193	};
194
195	/// 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
196	class Pass3 : public PolyMutator {
197	public:
198	template< typename DeclClass >
199	DeclClass handleDecl( DeclClass decl, Type *type );
200	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
201	virtual ObjectDecl mutate( ObjectDecl objectDecl );
202	virtual TypedefDecl mutate( TypedefDecl objectDecl );
203	virtual TypeDecl mutate( TypeDecl objectDecl );
204	virtual Type mutate( PointerType pointerType );
205	virtual Type mutate( FunctionType funcType );
206	private:
207	};
208
209	} // anonymous namespace
210
211	/// version of mutateAll with special handling for translation unit so you can check the end of the prelude when debugging
212	template< typename MutatorType >
213	inline void mutateTranslationUnit( std::list< Declaration* > &translationUnit, MutatorType &mutator ) {
214	bool seenIntrinsic = false;
215	SemanticError errors;
216	for ( typename std::list< Declaration* >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) {
217	try {
218	if ( *i ) {
219	if ( (*i)->get_linkage() == LinkageSpec::Intrinsic ) {
220	seenIntrinsic = true;
221	} else if ( seenIntrinsic ) {
222	seenIntrinsic = false; // break on this line when debugging for end of prelude
223	}
224
225	i = dynamic_cast< Declaration >( (*i)->acceptMutator( mutator ) );
226	assert( *i );
227	} // if
228	} catch( SemanticError &e ) {
229	errors.append( e );
230	} // try
231	} // for
232	if ( ! errors.isEmpty() ) {
233	throw errors;
234	} // if
235	}
236
237	void box( std::list< Declaration *>& translationUnit ) {
238	LayoutFunctionBuilder layoutBuilder;
239	Pass1 pass1;
240	Pass2 pass2;
241	PolyGenericCalculator polyCalculator;
242	Pass3 pass3;
243
244	layoutBuilder.mutateDeclarationList( translationUnit );
245	mutateTranslationUnit/All/( translationUnit, pass1 );
246	mutateTranslationUnit/All/( translationUnit, pass2 );
247	mutateTranslationUnit/All/( translationUnit, polyCalculator );
248	mutateTranslationUnit/All/( translationUnit, pass3 );
249	}
250
251	////////////////////////////////// LayoutFunctionBuilder ////////////////////////////////////////////
252
253	DeclarationWithType LayoutFunctionBuilder::mutate( FunctionDecl functionDecl ) {
254	functionDecl->set_functionType( maybeMutate( functionDecl->get_functionType(), *this ) );
255	mutateAll( functionDecl->get_oldDecls(), *this );
256	++functionNesting;
257	functionDecl->set_statements( maybeMutate( functionDecl->get_statements(), *this ) );
258	--functionNesting;
259	return functionDecl;
260	}
261
262	/// Get a list of type declarations that will affect a layout function
263	std::list< TypeDecl* > takeOtypeOnly( std::list< TypeDecl* > &decls ) {
264	std::list< TypeDecl * > otypeDecls;
265
266	for ( std::list< TypeDecl* >::const_iterator decl = decls.begin(); decl != decls.end(); ++decl ) {
267	if ( (*decl)->get_kind() == TypeDecl::Any ) {
268	otypeDecls.push_back( *decl );
269	}
270	}
271
272	return otypeDecls;
273	}
274
275	/// Adds parameters for otype layout to a function type
276	void addOtypeParams( FunctionType layoutFnType, std::list< TypeDecl > &otypeParams ) {
277	BasicType sizeAlignType( Type::Qualifiers(), BasicType::LongUnsignedInt );
278
279	for ( std::list< TypeDecl* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
280	TypeInstType paramType( Type::Qualifiers(), (param)->get_name(), param );
281	std::string paramName = mangleType( &paramType );
282	layoutFnType->get_parameters().push_back( new ObjectDecl( sizeofName( paramName ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
283	layoutFnType->get_parameters().push_back( new ObjectDecl( alignofName( paramName ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
284	}
285	}
286
287	/// Builds a layout function declaration
288	FunctionDecl buildLayoutFunctionDecl( AggregateDecl typeDecl, unsigned int functionNesting, FunctionType *layoutFnType ) {
289	// Routines at global scope marked "static" to prevent multiple definitions is separate translation units
290	// because each unit generates copies of the default routines for each aggregate.
291	FunctionDecl *layoutDecl = new FunctionDecl(
292	layoutofName( typeDecl ), functionNesting > 0 ? DeclarationNode::NoStorageClass : DeclarationNode::Static, LinkageSpec::AutoGen, layoutFnType, new CompoundStmt( noLabels ), true, false );
293	layoutDecl->fixUniqueId();
294	return layoutDecl;
295	}
296
297	/// Makes a unary operation
298	Expression makeOp( const std::string &name, Expression arg ) {
299	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
300	expr->get_args().push_back( arg );
301	return expr;
302	}
303
304	/// Makes a binary operation
305	Expression makeOp( const std::string &name, Expression lhs, Expression *rhs ) {
306	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
307	expr->get_args().push_back( lhs );
308	expr->get_args().push_back( rhs );
309	return expr;
310	}
311
312	/// Returns the dereference of a local pointer variable
313	Expression derefVar( ObjectDecl var ) {
314	return makeOp( "*?", new VariableExpr( var ) );
315	}
316
317	/// makes an if-statement with a single-expression if-block and no then block
318	Statement makeCond( Expression cond, Expression *ifPart ) {
319	return new IfStmt( noLabels, cond, new ExprStmt( noLabels, ifPart ), 0 );
320	}
321
322	/// makes a statement that assigns rhs to lhs if lhs < rhs
323	Statement makeAssignMax( Expression lhs, Expression *rhs ) {
324	return makeCond( makeOp( "?<?", lhs, rhs ), makeOp( "?=?", lhs->clone(), rhs->clone() ) );
325	}
326
327	/// makes a statement that aligns lhs to rhs (rhs should be an integer power of two)
328	Statement makeAlignTo( Expression lhs, Expression *rhs ) {
329	// check that the lhs is zeroed out to the level of rhs
330	Expression *ifCond = makeOp( "?&?", lhs, makeOp( "?-?", rhs, new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), "1" ) ) ) );
331	// if not aligned, increment to alignment
332	Expression *ifExpr = makeOp( "?+=?", lhs->clone(), makeOp( "?-?", rhs->clone(), ifCond->clone() ) );
333	return makeCond( ifCond, ifExpr );
334	}
335
336	/// adds an expression to a compound statement
337	void addExpr( CompoundStmt stmts, Expression expr ) {
338	stmts->get_kids().push_back( new ExprStmt( noLabels, expr ) );
339	}
340
341	/// adds a statement to a compound statement
342	void addStmt( CompoundStmt stmts, Statement stmt ) {
343	stmts->get_kids().push_back( stmt );
344	}
345
346	Declaration LayoutFunctionBuilder::mutate( StructDecl structDecl ) {
347	// do not generate layout function for "empty" tag structs
348	if ( structDecl->get_members().empty() ) return structDecl;
349
350	// get parameters that can change layout, exiting early if none
351	std::list< TypeDecl* > otypeParams = takeOtypeOnly( structDecl->get_parameters() );
352	if ( otypeParams.empty() ) return structDecl;
353
354	// build layout function signature
355	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
356	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
357	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
358
359	ObjectDecl *sizeParam = new ObjectDecl( sizeofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
360	layoutFnType->get_parameters().push_back( sizeParam );
361	ObjectDecl *alignParam = new ObjectDecl( alignofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
362	layoutFnType->get_parameters().push_back( alignParam );
363	ObjectDecl *offsetParam = new ObjectDecl( offsetofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
364	layoutFnType->get_parameters().push_back( offsetParam );
365	addOtypeParams( layoutFnType, otypeParams );
366
367	// build function decl
368	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( structDecl, functionNesting, layoutFnType );
369
370	// calculate struct layout in function body
371
372	// initialize size and alignment to 0 and 1 (will have at least one member to re-edit size
373	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "0" ) ) ) );
374	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
375	unsigned long n_members = 0;
376	bool firstMember = true;
377	for ( std::list< Declaration* >::const_iterator member = structDecl->get_members().begin(); member != structDecl->get_members().end(); ++member ) {
378	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
379	assert( dwt );
380	Type *memberType = dwt->get_type();
381
382	if ( firstMember ) {
383	firstMember = false;
384	} else {
385	// make sure all members after the first (automatically aligned at 0) are properly padded for alignment
386	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), new AlignofExpr( memberType->clone() ) ) );
387	}
388
389	// place current size in the current offset index
390	addExpr( layoutDecl->get_statements(), makeOp( "?=?", makeOp( "?[?]", new VariableExpr( offsetParam ), new ConstantExpr( Constant::from_ulong( n_members ) ) ),
391	derefVar( sizeParam ) ) );
392	++n_members;
393
394	// add member size to current size
395	addExpr( layoutDecl->get_statements(), makeOp( "?+=?", derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
396
397	// take max of member alignment and global alignment
398	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
399	}
400	// make sure the type is end-padded to a multiple of its alignment
401	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
402
403	addDeclarationAfter( layoutDecl );
404	return structDecl;
405	}
406
407	Declaration LayoutFunctionBuilder::mutate( UnionDecl unionDecl ) {
408	// do not generate layout function for "empty" tag unions
409	if ( unionDecl->get_members().empty() ) return unionDecl;
410
411	// get parameters that can change layout, exiting early if none
412	std::list< TypeDecl* > otypeParams = takeOtypeOnly( unionDecl->get_parameters() );
413	if ( otypeParams.empty() ) return unionDecl;
414
415	// build layout function signature
416	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
417	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
418	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
419
420	ObjectDecl *sizeParam = new ObjectDecl( sizeofName( unionDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
421	layoutFnType->get_parameters().push_back( sizeParam );
422	ObjectDecl *alignParam = new ObjectDecl( alignofName( unionDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
423	layoutFnType->get_parameters().push_back( alignParam );
424	addOtypeParams( layoutFnType, otypeParams );
425
426	// build function decl
427	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( unionDecl, functionNesting, layoutFnType );
428
429	// calculate union layout in function body
430	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
431	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
432	for ( std::list< Declaration* >::const_iterator member = unionDecl->get_members().begin(); member != unionDecl->get_members().end(); ++member ) {
433	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
434	assert( dwt );
435	Type *memberType = dwt->get_type();
436
437	// take max member size and global size
438	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
439
440	// take max of member alignment and global alignment
441	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
442	}
443	// make sure the type is end-padded to a multiple of its alignment
444	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
445
446	addDeclarationAfter( layoutDecl );
447	return unionDecl;
448	}
449
450	////////////////////////////////////////// Pass1 ////////////////////////////////////////////////////
451
452	namespace {
453	std::string makePolyMonoSuffix( FunctionType * function, const TyVarMap &tyVars ) {
454	std::stringstream name;
455
456	// NOTE: this function previously used isPolyObj, which failed to produce
457	// the correct thing in some situations. It's not clear to me why this wasn't working.
458
459	// if the return type or a parameter type involved polymorphic types, then the adapter will need
460	// to take those polymorphic types as pointers. Therefore, there can be two different functions
461	// with the same mangled name, so we need to further mangle the names.
462	for ( std::list< DeclarationWithType *>::iterator retval = function->get_returnVals().begin(); retval != function->get_returnVals().end(); ++retval ) {
463	if ( isPolyType( (*retval)->get_type(), tyVars ) ) {
464	name << "P";
465	} else {
466	name << "M";
467	}
468	}
469	name << "_";
470	std::list< DeclarationWithType *> &paramList = function->get_parameters();
471	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
472	if ( isPolyType( (*arg)->get_type(), tyVars ) ) {
473	name << "P";
474	} else {
475	name << "M";
476	}
477	} // for
478	return name.str();
479	}
480
481	std::string mangleAdapterName( FunctionType * function, const TyVarMap &tyVars ) {
482	return SymTab::Mangler::mangle( function ) + makePolyMonoSuffix( function, tyVars );
483	}
484
485	std::string makeAdapterName( const std::string &mangleName ) {
486	return "_adapter" + mangleName;
487	}
488
489	Pass1::Pass1() : useRetval( false ), tempNamer( "_temp" ) {}
490
491	/// Returns T if the given declaration is a function with parameter (T*) for some TypeInstType T, NULL otherwise
492	TypeInstType isTypeInstPtrFn( DeclarationWithType decl ) {
493	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
494	if ( funType->get_parameters().size() == 1 ) {
495	if ( PointerType pointer = dynamic_cast< PointerType >( funType->get_parameters().front()->get_type() ) ) {
496	if ( TypeInstType refType = dynamic_cast< TypeInstType >( pointer->get_base() ) ) {
497	return refType;
498	} // if
499	} // if
500	} // if
501	} // if
502	return 0;
503	}
504
505	/// Returns T if the given declaration is a function with parameters (T*, T) for some TypeInstType T, NULL otherwise
506	TypeInstType isTypeInstPtrValFn( DeclarationWithType decl ) {
507	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
508	if ( funType->get_parameters().size() == 2 ) {
509	if ( PointerType pointer = dynamic_cast< PointerType >( funType->get_parameters().front()->get_type() ) ) {
510	if ( TypeInstType refType = dynamic_cast< TypeInstType >( pointer->get_base() ) ) {
511	if ( TypeInstType refType2 = dynamic_cast< TypeInstType >( funType->get_parameters().back()->get_type() ) ) {
512	if ( refType->get_name() == refType2->get_name() ) {
513	return refType;
514	} // if
515	} // if
516	} // if
517	} // if
518	} // if
519	} // if
520	return 0;
521	}
522
523	/// Returns T if the given declaration is (?=?)(T , T) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
524	TypeInstType isTypeInstAssignment( DeclarationWithType decl ) {
525	return decl->get_name() == "?=?" ? isTypeInstPtrValFn( decl ) : 0;
526	}
527
528	/// Returns T if the given declaration is (?{})(T ) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
529	TypeInstType isTypeInstCtor( DeclarationWithType decl ) {
530	return decl->get_name() == "?{}" ? isTypeInstPtrFn( decl ) : 0;
531	}
532
533	/// Returns T if the given declaration is (?{})(T , T) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
534	TypeInstType isTypeInstCopy( DeclarationWithType decl ) {
535	return decl->get_name() == "?{}" ? isTypeInstPtrValFn( decl ) : 0;
536	}
537
538	/// Returns T if the given declaration is (^?{})(T ) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
539	TypeInstType isTypeInstDtor( DeclarationWithType decl ) {
540	return decl->get_name() == "^?{}" ? isTypeInstPtrFn( decl ) : 0;
541	}
542
543	/// Returns T if the given declaration is a function with parameters (T*, T) for some type T, where neither parameter is cv-qualified,
544	/// NULL otherwise
545	Type isNoCvPtrFn( DeclarationWithType decl ) {
546	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
547	if ( funType->get_parameters().size() == 1 ) {
548	Type::Qualifiers defaultQualifiers;
549	Type *paramType = funType->get_parameters().front()->get_type();
550	if ( paramType->get_qualifiers() != defaultQualifiers ) return 0;
551
552	if ( PointerType pointerType = dynamic_cast< PointerType >( paramType ) ) {
553	Type *baseType = pointerType->get_base();
554	if ( baseType->get_qualifiers() == defaultQualifiers ) {
555	return baseType;
556	} // if
557	} // if
558	} // if
559	} // if
560	return 0;
561	}
562
563	/// Returns T if the given declaration is a function with parameters (T*, T) for some type T, where neither parameter is cv-qualified,
564	/// NULL otherwise
565	Type isNoCvPtrValFn( DeclarationWithType decl ) {
566	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
567	if ( funType->get_parameters().size() == 2 ) {
568	Type::Qualifiers defaultQualifiers;
569	Type *paramType1 = funType->get_parameters().front()->get_type();
570	if ( paramType1->get_qualifiers() != defaultQualifiers ) return 0;
571	Type *paramType2 = funType->get_parameters().back()->get_type();
572	if ( paramType2->get_qualifiers() != defaultQualifiers ) return 0;
573
574	if ( PointerType pointerType = dynamic_cast< PointerType >( paramType1 ) ) {
575	Type *baseType1 = pointerType->get_base();
576	if ( baseType1->get_qualifiers() != defaultQualifiers ) return 0;
577	SymTab::Indexer dummy;
578	if ( ResolvExpr::typesCompatible( baseType1, paramType2, dummy ) ) {
579	return baseType1;
580	} // if
581	} // if
582	} // if
583	} // if
584	return 0;
585	}
586
587	/// returns T if the given declaration is: (?=?)(T , T) for some type T (return not checked, but maybe should be), NULL otherwise
588	/// Only picks assignments where neither parameter is cv-qualified
589	Type isAssignment( DeclarationWithType decl ) {
590	return decl->get_name() == "?=?" ? isNoCvPtrValFn( decl ) : 0;
591	}
592
593	/// returns T if the given declaration is: (?{})(T ) for some type T, NULL otherwise
594	/// Only picks ctors where the parameter is not cv-qualified
595	Type isCtor( DeclarationWithType decl ) {
596	return decl->get_name() == "?{}" ? isNoCvPtrFn( decl ) : 0;
597	}
598
599	/// returns T if the given declaration is: (?{})(T , T) for some type T (return not checked, but maybe should be), NULL otherwise
600	/// Only picks copy constructors where neither parameter is cv-qualified
601	Type isCopy( DeclarationWithType decl ) {
602	return decl->get_name() == "?{}" ? isNoCvPtrValFn( decl ) : 0;
603	}
604
605	/// returns T if the given declaration is: (?{})(T ) for some type T, NULL otherwise
606	/// Only picks ctors where the parameter is not cv-qualified
607	Type isDtor( DeclarationWithType decl ) {
608	return decl->get_name() == "^?{}" ? isNoCvPtrFn( decl ) : 0;
609	}
610
611	void Pass1::findTypeOps( const std::list< TypeDecl *> &forall ) {
612	// what if a nested function uses an assignment operator?
613	// assignOps.clear();
614	for ( std::list< TypeDecl *>::const_iterator i = forall.begin(); i != forall.end(); ++i ) {
615	for ( std::list< DeclarationWithType >::const_iterator assert = (i)->get_assertions().begin(); assert != (*i)->get_assertions().end(); ++assert ) {
616	std::string typeName;
617	if ( TypeInstType typeInst = isTypeInstAssignment( assert ) ) {
618	assignOps[ typeInst->get_name() ] = *assert;
619	} else if ( TypeInstType typeInst = isTypeInstCtor( assert ) ) {
620	ctorOps[ typeInst->get_name() ] = *assert;
621	} else if ( TypeInstType typeInst = isTypeInstCopy( assert ) ) {
622	copyOps[ typeInst->get_name() ] = *assert;
623	} else if ( TypeInstType typeInst = isTypeInstDtor( assert ) ) {
624	dtorOps[ typeInst->get_name() ] = *assert;
625	} // if
626	} // for
627	} // for
628	}
629
630	DeclarationWithType Pass1::mutate( FunctionDecl functionDecl ) {
631	// if this is a assignment function, put it in the map for this scope
632	if ( Type *paramType = isAssignment( functionDecl ) ) {
633	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
634	scopedAssignOps.insert( paramType, functionDecl );
635	}
636	} else if ( Type *paramType = isCtor( functionDecl ) ) {
637	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
638	scopedCtorOps.insert( paramType, functionDecl );
639	}
640	} else if ( Type *paramType = isCopy( functionDecl ) ) {
641	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
642	scopedCopyOps.insert( paramType, functionDecl );
643	}
644	} else if ( Type *paramType = isDtor( functionDecl ) ) {
645	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
646	scopedDtorOps.insert( paramType, functionDecl );
647	}
648	}
649
650	if ( functionDecl->get_statements() ) { // empty routine body ?
651	doBeginScope();
652	scopeTyVars.beginScope();
653	assignOps.beginScope();
654	ctorOps.beginScope();
655	copyOps.beginScope();
656	dtorOps.beginScope();
657
658	DeclarationWithType *oldRetval = retval;
659	bool oldUseRetval = useRetval;
660
661	// process polymorphic return value
662	retval = 0;
663	if ( isPolyRet( functionDecl->get_functionType() ) && functionDecl->get_linkage() == LinkageSpec::Cforall ) {
664	retval = functionDecl->get_functionType()->get_returnVals().front();
665
666	// give names to unnamed return values
667	if ( retval->get_name() == "" ) {
668	retval->set_name( "_retparm" );
669	retval->set_linkage( LinkageSpec::C );
670	} // if
671	} // if
672
673	FunctionType *functionType = functionDecl->get_functionType();
674	makeTyVarMap( functionDecl->get_functionType(), scopeTyVars );
675	findTypeOps( functionDecl->get_functionType()->get_forall() );
676
677	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
678	std::list< FunctionType *> functions;
679	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
680	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
681	findFunction( (*assert)->get_type(), functions, scopeTyVars, needsAdapter );
682	} // for
683	} // for
684	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
685	findFunction( (*arg)->get_type(), functions, scopeTyVars, needsAdapter );
686	} // for
687
688	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
689	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
690	if ( adapters.find( mangleName ) == adapters.end() ) {
691	std::string adapterName = makeAdapterName( mangleName );
692	adapters.insert( std::pair< std::string, DeclarationWithType >( mangleName, new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( funType, scopeTyVars ) ), 0 ) ) );
693	} // if
694	} // for
695
696	functionDecl->set_statements( functionDecl->get_statements()->acceptMutator( *this ) );
697
698	scopeTyVars.endScope();
699	assignOps.endScope();
700	ctorOps.endScope();
701	copyOps.endScope();
702	dtorOps.endScope();
703	retval = oldRetval;
704	useRetval = oldUseRetval;
705	doEndScope();
706	} // if
707	return functionDecl;
708	}
709
710	TypeDecl Pass1::mutate( TypeDecl typeDecl ) {
711	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
712	return Mutator::mutate( typeDecl );
713	}
714
715	Expression Pass1::mutate( CommaExpr commaExpr ) {
716	bool oldUseRetval = useRetval;
717	useRetval = false;
718	commaExpr->set_arg1( maybeMutate( commaExpr->get_arg1(), *this ) );
719	useRetval = oldUseRetval;
720	commaExpr->set_arg2( maybeMutate( commaExpr->get_arg2(), *this ) );
721	return commaExpr;
722	}
723
724	Expression Pass1::mutate( ConditionalExpr condExpr ) {
725	bool oldUseRetval = useRetval;
726	useRetval = false;
727	condExpr->set_arg1( maybeMutate( condExpr->get_arg1(), *this ) );
728	useRetval = oldUseRetval;
729	condExpr->set_arg2( maybeMutate( condExpr->get_arg2(), *this ) );
730	condExpr->set_arg3( maybeMutate( condExpr->get_arg3(), *this ) );
731	return condExpr;
732
733	}
734
735	void Pass1::passArgTypeVars( ApplicationExpr appExpr, Type parmType, Type argBaseType, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars, std::set< std::string > &seenTypes ) {
736	Type *polyType = isPolyType( parmType, exprTyVars );
737	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
738	std::string typeName = mangleType( polyType );
739	if ( seenTypes.count( typeName ) ) return;
740
741	arg = appExpr->get_args().insert( arg, new SizeofExpr( argBaseType->clone() ) );
742	arg++;
743	arg = appExpr->get_args().insert( arg, new AlignofExpr( argBaseType->clone() ) );
744	arg++;
745	if ( dynamic_cast< StructInstType* >( polyType ) ) {
746	if ( StructInstType argBaseStructType = dynamic_cast< StructInstType >( argBaseType ) ) {
747	// zero-length arrays are forbidden by C, so don't pass offset for empty struct
748	if ( ! argBaseStructType->get_baseStruct()->get_members().empty() ) {
749	arg = appExpr->get_args().insert( arg, new OffsetPackExpr( argBaseStructType->clone() ) );
750	arg++;
751	}
752	} else {
753	throw SemanticError( "Cannot pass non-struct type for generic struct" );
754	}
755	}
756
757	seenTypes.insert( typeName );
758	}
759	}
760
761	void Pass1::passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
762	// pass size/align for type variables
763	for ( TyVarMap::const_iterator tyParm = exprTyVars.begin(); tyParm != exprTyVars.end(); ++tyParm ) {
764	ResolvExpr::EqvClass eqvClass;
765	assert( env );
766	if ( tyParm->second == TypeDecl::Any ) {
767	Type *concrete = env->lookup( tyParm->first );
768	if ( concrete ) {
769	arg = appExpr->get_args().insert( arg, new SizeofExpr( concrete->clone() ) );
770	arg++;
771	arg = appExpr->get_args().insert( arg, new AlignofExpr( concrete->clone() ) );
772	arg++;
773	} else {
774	// xxx - should this be an assertion?
775	throw SemanticError( "unbound type variable: " + tyParm->first + " in application ", appExpr );
776	} // if
777	} // if
778	} // for
779
780	// add size/align for generic types to parameter list
781	if ( appExpr->get_function()->get_results().empty() ) return;
782	FunctionType *funcType = getFunctionType( appExpr->get_function()->get_results().front() );
783	assert( funcType );
784
785	std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin();
786	std::list< Expression* >::const_iterator fnArg = arg;
787	std::set< std::string > seenTypes; ///< names for generic types we've seen
788
789	// a polymorphic return type may need to be added to the argument list
790	if ( polyRetType ) {
791	Type *concRetType = replaceWithConcrete( appExpr, polyRetType );
792	passArgTypeVars( appExpr, polyRetType, concRetType, arg, exprTyVars, seenTypes );
793	}
794
795	// add type information args for presently unseen types in parameter list
796	for ( ; fnParm != funcType->get_parameters().end() && fnArg != appExpr->get_args().end(); ++fnParm, ++fnArg ) {
797	VariableExpr fnArgBase = getBaseVar( fnArg );
798	if ( ! fnArgBase \|\| fnArgBase->get_results().empty() ) continue;
799	passArgTypeVars( appExpr, (*fnParm)->get_type(), fnArgBase->get_results().front(), arg, exprTyVars, seenTypes );
800	}
801	}
802
803	ObjectDecl Pass1::makeTemporary( Type type ) {
804	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, 0 );
805	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
806	return newObj;
807	}
808
809	Expression Pass1::addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg ) {
810	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
811	// if ( useRetval ) {
812	// assert( retval );
813	// arg = appExpr->get_args().insert( arg, new VariableExpr( retval ) );
814	// arg++;
815	// } else {
816
817	// Create temporary to hold return value of polymorphic function and produce that temporary as a result
818	// using a comma expression. Possibly change comma expression into statement expression "{}" for multiple
819	// return values.
820	ObjectDecl *newObj = makeTemporary( retType->clone() );
821	Expression *paramExpr = new VariableExpr( newObj );
822
823	// If the type of the temporary is not polymorphic, box temporary by taking its address;
824	// otherwise the temporary is already boxed and can be used directly.
825	if ( ! isPolyType( newObj->get_type(), scopeTyVars, env ) ) {
826	paramExpr = new AddressExpr( paramExpr );
827	} // if
828	arg = appExpr->get_args().insert( arg, paramExpr ); // add argument to function call
829	arg++;
830	// Build a comma expression to call the function and emulate a normal return.
831	CommaExpr *commaExpr = new CommaExpr( appExpr, new VariableExpr( newObj ) );
832	commaExpr->set_env( appExpr->get_env() );
833	appExpr->set_env( 0 );
834	return commaExpr;
835	// } // if
836	// return appExpr;
837	}
838
839	void Pass1::replaceParametersWithConcrete( ApplicationExpr appExpr, std::list< Expression >& params ) {
840	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
841	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
842	assert(paramType && "Aggregate parameters should be type expressions");
843	paramType->set_type( replaceWithConcrete( appExpr, paramType->get_type(), false ) );
844	}
845	}
846
847	Type Pass1::replaceWithConcrete( ApplicationExpr appExpr, Type *type, bool doClone ) {
848	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
849	Type *concrete = env->lookup( typeInst->get_name() );
850	if ( concrete == 0 ) {
851	throw SemanticError( "Unbound type variable " + typeInst->get_name() + " in ", appExpr );
852	} // if
853	return concrete;
854	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
855	if ( doClone ) {
856	structType = structType->clone();
857	}
858	replaceParametersWithConcrete( appExpr, structType->get_parameters() );
859	return structType;
860	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
861	if ( doClone ) {
862	unionType = unionType->clone();
863	}
864	replaceParametersWithConcrete( appExpr, unionType->get_parameters() );
865	return unionType;
866	}
867	return type;
868	}
869
870	Expression Pass1::addPolyRetParam( ApplicationExpr appExpr, FunctionType function, ReferenceToType polyType, std::list< Expression *>::iterator &arg ) {
871	assert( env );
872	Type *concrete = replaceWithConcrete( appExpr, polyType );
873	// add out-parameter for return value
874	return addRetParam( appExpr, function, concrete, arg );
875	}
876
877	Expression Pass1::applyAdapter( ApplicationExpr appExpr, FunctionType function, std::list< Expression >::iterator &arg, const TyVarMap &tyVars ) {
878	Expression *ret = appExpr;
879	if ( ! function->get_returnVals().empty() && isPolyType( function->get_returnVals().front()->get_type(), tyVars ) ) {
880	ret = addRetParam( appExpr, function, function->get_returnVals().front()->get_type(), arg );
881	} // if
882	std::string mangleName = mangleAdapterName( function, tyVars );
883	std::string adapterName = makeAdapterName( mangleName );
884
885	// cast adaptee to void (*)(), since it may have any type inside a polymorphic function
886	Type * adapteeType = new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) );
887	appExpr->get_args().push_front( new CastExpr( appExpr->get_function(), adapteeType ) );
888	appExpr->set_function( new NameExpr( adapterName ) );
889
890	return ret;
891	}
892
893	void Pass1::boxParam( Type param, Expression &arg, const TyVarMap &exprTyVars ) {
894	assert( ! arg->get_results().empty() );
895	if ( isPolyType( param, exprTyVars ) ) {
896	if ( isPolyType( arg->get_results().front() ) ) {
897	// if the argument's type is polymorphic, we don't need to box again!
898	return;
899	} else if ( arg->get_results().front()->get_isLvalue() ) {
900	// VariableExpr and MemberExpr are lvalues; need to check this isn't coming from the second arg of a comma expression though (not an lvalue)
901	// xxx - need to test that this code is still reachable
902	if ( CommaExpr commaArg = dynamic_cast< CommaExpr >( arg ) ) {
903	commaArg->set_arg2( new AddressExpr( commaArg->get_arg2() ) );
904	} else {
905	arg = new AddressExpr( arg );
906	}
907	} else {
908	// use type computed in unification to declare boxed variables
909	Type * newType = param->clone();
910	if ( env ) env->apply( newType );
911	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, newType, 0 );
912	newObj->get_type()->get_qualifiers() = Type::Qualifiers(); // TODO: is this right???
913	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
914	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
915	assign->get_args().push_back( new VariableExpr( newObj ) );
916	assign->get_args().push_back( arg );
917	stmtsToAdd.push_back( new ExprStmt( noLabels, assign ) );
918	arg = new AddressExpr( new VariableExpr( newObj ) );
919	} // if
920	} // if
921	}
922
923	/// cast parameters to polymorphic functions so that types are replaced with
924	/// void * if they are type parameters in the formal type.
925	/// this gets rid of warnings from gcc.
926	void addCast( Expression &actual, Type formal, const TyVarMap &tyVars ) {
927	if ( getFunctionType( formal ) ) {
928	Type * newType = formal->clone();
929	newType = ScrubTyVars::scrub( newType, tyVars );
930	actual = new CastExpr( actual, newType );
931	} // if
932	}
933
934	void Pass1::boxParams( ApplicationExpr appExpr, FunctionType function, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
935	for ( std::list< DeclarationWithType *>::const_iterator param = function->get_parameters().begin(); param != function->get_parameters().end(); ++param, ++arg ) {
936	assert( arg != appExpr->get_args().end() );
937	addCast( arg, (param)->get_type(), exprTyVars );
938	boxParam( (param)->get_type(), arg, exprTyVars );
939	} // for
940	}
941
942	void Pass1::addInferredParams( ApplicationExpr appExpr, FunctionType functionType, std::list< Expression *>::iterator &arg, const TyVarMap &tyVars ) {
943	std::list< Expression *>::iterator cur = arg;
944	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
945	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
946	InferredParams::const_iterator inferParam = appExpr->get_inferParams().find( (*assert)->get_uniqueId() );
947	assert( inferParam != appExpr->get_inferParams().end() && "NOTE: Explicit casts of polymorphic functions to compatible monomorphic functions are currently unsupported" );
948	Expression *newExpr = inferParam->second.expr->clone();
949	addCast( newExpr, (*assert)->get_type(), tyVars );
950	boxParam( (*assert)->get_type(), newExpr, tyVars );
951	appExpr->get_args().insert( cur, newExpr );
952	} // for
953	} // for
954	}
955
956	void makeRetParm( FunctionType *funcType ) {
957	DeclarationWithType *retParm = funcType->get_returnVals().front();
958
959	// make a new parameter that is a pointer to the type of the old return value
960	retParm->set_type( new PointerType( Type::Qualifiers(), retParm->get_type() ) );
961	funcType->get_parameters().push_front( retParm );
962
963	// we don't need the return value any more
964	funcType->get_returnVals().clear();
965	}
966
967	FunctionType makeAdapterType( FunctionType adaptee, const TyVarMap &tyVars ) {
968	// actually make the adapter type
969	FunctionType *adapter = adaptee->clone();
970	if ( ! adapter->get_returnVals().empty() && isPolyType( adapter->get_returnVals().front()->get_type(), tyVars ) ) {
971	makeRetParm( adapter );
972	} // if
973	adapter->get_parameters().push_front( new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) ), 0 ) );
974	return adapter;
975	}
976
977	Expression makeAdapterArg( DeclarationWithType param, DeclarationWithType arg, DeclarationWithType realParam, const TyVarMap &tyVars ) {
978	assert( param );
979	assert( arg );
980	if ( isPolyType( realParam->get_type(), tyVars ) ) {
981	if ( ! isPolyType( arg->get_type() ) ) {
982	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
983	deref->get_args().push_back( new CastExpr( new VariableExpr( param ), new PointerType( Type::Qualifiers(), arg->get_type()->clone() ) ) );
984	deref->get_results().push_back( arg->get_type()->clone() );
985	return deref;
986	} // if
987	} // if
988	return new VariableExpr( param );
989	}
990
991	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 ) {
992	UniqueName paramNamer( "_p" );
993	for ( ; param != paramEnd; ++param, ++arg, ++realParam ) {
994	if ( (*param)->get_name() == "" ) {
995	(*param)->set_name( paramNamer.newName() );
996	(*param)->set_linkage( LinkageSpec::C );
997	} // if
998	adapteeApp->get_args().push_back( makeAdapterArg( param, arg, *realParam, tyVars ) );
999	} // for
1000	}
1001
1002	FunctionDecl Pass1::makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars ) {
1003	FunctionType *adapterType = makeAdapterType( adaptee, tyVars );
1004	adapterType = ScrubTyVars::scrub( adapterType, tyVars );
1005	DeclarationWithType *adapteeDecl = adapterType->get_parameters().front();
1006	adapteeDecl->set_name( "_adaptee" );
1007	ApplicationExpr *adapteeApp = new ApplicationExpr( new CastExpr( new VariableExpr( adapteeDecl ), new PointerType( Type::Qualifiers(), realType ) ) );
1008	Statement *bodyStmt;
1009
1010	std::list< TypeDecl *>::iterator tyArg = realType->get_forall().begin();
1011	std::list< TypeDecl *>::iterator tyParam = adapterType->get_forall().begin();
1012	std::list< TypeDecl *>::iterator realTyParam = adaptee->get_forall().begin();
1013	for ( ; tyParam != adapterType->get_forall().end(); ++tyArg, ++tyParam, ++realTyParam ) {
1014	assert( tyArg != realType->get_forall().end() );
1015	std::list< DeclarationWithType >::iterator assertArg = (tyArg)->get_assertions().begin();
1016	std::list< DeclarationWithType >::iterator assertParam = (tyParam)->get_assertions().begin();
1017	std::list< DeclarationWithType >::iterator realAssertParam = (realTyParam)->get_assertions().begin();
1018	for ( ; assertParam != (*tyParam)->get_assertions().end(); ++assertArg, ++assertParam, ++realAssertParam ) {
1019	assert( assertArg != (*tyArg)->get_assertions().end() );
1020	adapteeApp->get_args().push_back( makeAdapterArg( assertParam, assertArg, *realAssertParam, tyVars ) );
1021	} // for
1022	} // for
1023
1024	std::list< DeclarationWithType *>::iterator arg = realType->get_parameters().begin();
1025	std::list< DeclarationWithType *>::iterator param = adapterType->get_parameters().begin();
1026	std::list< DeclarationWithType *>::iterator realParam = adaptee->get_parameters().begin();
1027	param++; // skip adaptee parameter in the adapter type
1028	if ( realType->get_returnVals().empty() ) {
1029	// void return
1030	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1031	bodyStmt = new ExprStmt( noLabels, adapteeApp );
1032	} else if ( isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
1033	// return type T
1034	if ( (*param)->get_name() == "" ) {
1035	(*param)->set_name( "_ret" );
1036	(*param)->set_linkage( LinkageSpec::C );
1037	} // if
1038	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
1039	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
1040	deref->get_args().push_back( new CastExpr( new VariableExpr( *param++ ), new PointerType( Type::Qualifiers(), realType->get_returnVals().front()->get_type()->clone() ) ) );
1041	assign->get_args().push_back( deref );
1042	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1043	assign->get_args().push_back( adapteeApp );
1044	bodyStmt = new ExprStmt( noLabels, assign );
1045	} else {
1046	// adapter for a function that returns a monomorphic value
1047	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1048	bodyStmt = new ReturnStmt( noLabels, adapteeApp );
1049	} // if
1050	CompoundStmt *adapterBody = new CompoundStmt( noLabels );
1051	adapterBody->get_kids().push_back( bodyStmt );
1052	std::string adapterName = makeAdapterName( mangleName );
1053	return new FunctionDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, adapterType, adapterBody, false, false );
1054	}
1055
1056	void Pass1::passAdapters( ApplicationExpr * appExpr, FunctionType * functionType, const TyVarMap & exprTyVars ) {
1057	// collect a list of function types passed as parameters or implicit parameters (assertions)
1058	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
1059	std::list< FunctionType *> functions;
1060	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
1061	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
1062	findFunction( (*assert)->get_type(), functions, exprTyVars, needsAdapter );
1063	} // for
1064	} // for
1065	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
1066	findFunction( (*arg)->get_type(), functions, exprTyVars, needsAdapter );
1067	} // for
1068
1069	// parameter function types for which an appropriate adapter has been generated. we cannot use the types
1070	// after applying substitutions, since two different parameter types may be unified to the same type
1071	std::set< std::string > adaptersDone;
1072
1073	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
1074	FunctionType originalFunction = (funType)->clone();
1075	FunctionType realFunction = (funType)->clone();
1076	std::string mangleName = SymTab::Mangler::mangle( realFunction );
1077
1078	// only attempt to create an adapter or pass one as a parameter if we haven't already done so for this
1079	// pre-substitution parameter function type.
1080	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
1081	adaptersDone.insert( adaptersDone.begin(), mangleName );
1082
1083	// apply substitution to type variables to figure out what the adapter's type should look like
1084	assert( env );
1085	env->apply( realFunction );
1086	mangleName = SymTab::Mangler::mangle( realFunction );
1087	mangleName += makePolyMonoSuffix( originalFunction, exprTyVars );
1088
1089	typedef ScopedMap< std::string, DeclarationWithType* >::iterator AdapterIter;
1090	AdapterIter adapter = adapters.find( mangleName );
1091	if ( adapter == adapters.end() ) {
1092	// adapter has not been created yet in the current scope, so define it
1093	FunctionDecl newAdapter = makeAdapter( funType, realFunction, mangleName, exprTyVars );
1094	std::pair< AdapterIter, bool > answer = adapters.insert( std::pair< std::string, DeclarationWithType *>( mangleName, newAdapter ) );
1095	adapter = answer.first;
1096	stmtsToAdd.push_back( new DeclStmt( noLabels, newAdapter ) );
1097	} // if
1098	assert( adapter != adapters.end() );
1099
1100	// add the appropriate adapter as a parameter
1101	appExpr->get_args().push_front( new VariableExpr( adapter->second ) );
1102	} // if
1103	} // for
1104	} // passAdapters
1105
1106	Expression makeIncrDecrExpr( ApplicationExpr appExpr, Type *polyType, bool isIncr ) {
1107	NameExpr *opExpr;
1108	if ( isIncr ) {
1109	opExpr = new NameExpr( "?+=?" );
1110	} else {
1111	opExpr = new NameExpr( "?-=?" );
1112	} // if
1113	UntypedExpr *addAssign = new UntypedExpr( opExpr );
1114	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
1115	addAssign->get_args().push_back( address->get_arg() );
1116	} else {
1117	addAssign->get_args().push_back( appExpr->get_args().front() );
1118	} // if
1119	addAssign->get_args().push_back( new NameExpr( sizeofName( mangleType( polyType ) ) ) );
1120	addAssign->get_results().front() = appExpr->get_results().front()->clone();
1121	if ( appExpr->get_env() ) {
1122	addAssign->set_env( appExpr->get_env() );
1123	appExpr->set_env( 0 );
1124	} // if
1125	appExpr->get_args().clear();
1126	delete appExpr;
1127	return addAssign;
1128	}
1129
1130	Expression Pass1::handleIntrinsics( ApplicationExpr appExpr ) {
1131	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( appExpr->get_function() ) ) {
1132	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic ) {
1133	if ( varExpr->get_var()->get_name() == "?[?]" ) {
1134	assert( ! appExpr->get_results().empty() );
1135	assert( appExpr->get_args().size() == 2 );
1136	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
1137	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
1138	assert( ! baseType1 \|\| ! baseType2 ); // the arguments cannot both be polymorphic pointers
1139	UntypedExpr *ret = 0;
1140	if ( baseType1 \|\| baseType2 ) { // one of the arguments is a polymorphic pointer
1141	ret = new UntypedExpr( new NameExpr( "?+?" ) );
1142	} // if
1143	if ( baseType1 ) {
1144	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1145	multiply->get_args().push_back( appExpr->get_args().back() );
1146	multiply->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1147	ret->get_args().push_back( appExpr->get_args().front() );
1148	ret->get_args().push_back( multiply );
1149	} else if ( baseType2 ) {
1150	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1151	multiply->get_args().push_back( appExpr->get_args().front() );
1152	multiply->get_args().push_back( new SizeofExpr( baseType2->clone() ) );
1153	ret->get_args().push_back( multiply );
1154	ret->get_args().push_back( appExpr->get_args().back() );
1155	} // if
1156	if ( baseType1 \|\| baseType2 ) {
1157	ret->get_results().push_front( appExpr->get_results().front()->clone() );
1158	if ( appExpr->get_env() ) {
1159	ret->set_env( appExpr->get_env() );
1160	appExpr->set_env( 0 );
1161	} // if
1162	appExpr->get_args().clear();
1163	delete appExpr;
1164	return ret;
1165	} // if
1166	} else if ( varExpr->get_var()->get_name() == "*?" ) {
1167	assert( ! appExpr->get_results().empty() );
1168	assert( ! appExpr->get_args().empty() );
1169	if ( isPolyType( appExpr->get_results().front(), scopeTyVars, env ) ) {
1170	Expression *ret = appExpr->get_args().front();
1171	delete ret->get_results().front();
1172	ret->get_results().front() = appExpr->get_results().front()->clone();
1173	if ( appExpr->get_env() ) {
1174	ret->set_env( appExpr->get_env() );
1175	appExpr->set_env( 0 );
1176	} // if
1177	appExpr->get_args().clear();
1178	delete appExpr;
1179	return ret;
1180	} // if
1181	} else if ( varExpr->get_var()->get_name() == "?++" \|\| varExpr->get_var()->get_name() == "?--" ) {
1182	assert( ! appExpr->get_results().empty() );
1183	assert( appExpr->get_args().size() == 1 );
1184	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
1185	Type *tempType = appExpr->get_results().front()->clone();
1186	if ( env ) {
1187	env->apply( tempType );
1188	} // if
1189	ObjectDecl *newObj = makeTemporary( tempType );
1190	VariableExpr *tempExpr = new VariableExpr( newObj );
1191	UntypedExpr *assignExpr = new UntypedExpr( new NameExpr( "?=?" ) );
1192	assignExpr->get_args().push_back( tempExpr->clone() );
1193	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
1194	assignExpr->get_args().push_back( address->get_arg()->clone() );
1195	} else {
1196	assignExpr->get_args().push_back( appExpr->get_args().front()->clone() );
1197	} // if
1198	CommaExpr *firstComma = new CommaExpr( assignExpr, makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "?++" ) );
1199	return new CommaExpr( firstComma, tempExpr );
1200	} // if
1201	} else if ( varExpr->get_var()->get_name() == "++?" \|\| varExpr->get_var()->get_name() == "--?" ) {
1202	assert( ! appExpr->get_results().empty() );
1203	assert( appExpr->get_args().size() == 1 );
1204	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
1205	return makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "++?" );
1206	} // if
1207	} else if ( varExpr->get_var()->get_name() == "?+?" \|\| varExpr->get_var()->get_name() == "?-?" ) {
1208	assert( ! appExpr->get_results().empty() );
1209	assert( appExpr->get_args().size() == 2 );
1210	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
1211	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
1212	if ( baseType1 && baseType2 ) {
1213	UntypedExpr *divide = new UntypedExpr( new NameExpr( "?/?" ) );
1214	divide->get_args().push_back( appExpr );
1215	divide->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1216	divide->get_results().push_front( appExpr->get_results().front()->clone() );
1217	if ( appExpr->get_env() ) {
1218	divide->set_env( appExpr->get_env() );
1219	appExpr->set_env( 0 );
1220	} // if
1221	return divide;
1222	} else if ( baseType1 ) {
1223	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1224	multiply->get_args().push_back( appExpr->get_args().back() );
1225	multiply->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1226	appExpr->get_args().back() = multiply;
1227	} else if ( baseType2 ) {
1228	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1229	multiply->get_args().push_back( appExpr->get_args().front() );
1230	multiply->get_args().push_back( new SizeofExpr( baseType2->clone() ) );
1231	appExpr->get_args().front() = multiply;
1232	} // if
1233	} else if ( varExpr->get_var()->get_name() == "?+=?" \|\| varExpr->get_var()->get_name() == "?-=?" ) {
1234	assert( ! appExpr->get_results().empty() );
1235	assert( appExpr->get_args().size() == 2 );
1236	Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env );
1237	if ( baseType ) {
1238	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1239	multiply->get_args().push_back( appExpr->get_args().back() );
1240	multiply->get_args().push_back( new SizeofExpr( baseType->clone() ) );
1241	appExpr->get_args().back() = multiply;
1242	} // if
1243	} // if
1244	return appExpr;
1245	} // if
1246	} // if
1247	return 0;
1248	}
1249
1250	Expression Pass1::mutate( ApplicationExpr appExpr ) {
1251	// std::cerr << "mutate appExpr: ";
1252	// for ( TyVarMap::iterator i = scopeTyVars.begin(); i != scopeTyVars.end(); ++i ) {
1253	// std::cerr << i->first << " ";
1254	// }
1255	// std::cerr << "\n";
1256	bool oldUseRetval = useRetval;
1257	useRetval = false;
1258	appExpr->get_function()->acceptMutator( *this );
1259	mutateAll( appExpr->get_args(), *this );
1260	useRetval = oldUseRetval;
1261
1262	assert( ! appExpr->get_function()->get_results().empty() );
1263	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
1264	assert( pointer );
1265	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
1266	assert( function );
1267
1268	if ( Expression *newExpr = handleIntrinsics( appExpr ) ) {
1269	return newExpr;
1270	} // if
1271
1272	Expression *ret = appExpr;
1273
1274	std::list< Expression *>::iterator arg = appExpr->get_args().begin();
1275	std::list< Expression *>::iterator paramBegin = appExpr->get_args().begin();
1276
1277	TyVarMap exprTyVars( (TypeDecl::Kind)-1 );
1278	makeTyVarMap( function, exprTyVars );
1279	ReferenceToType *polyRetType = isPolyRet( function );
1280
1281	if ( polyRetType ) {
1282	ret = addPolyRetParam( appExpr, function, polyRetType, arg );
1283	} else if ( needsAdapter( function, scopeTyVars ) ) {
1284	// std::cerr << "needs adapter: ";
1285	// printTyVarMap( std::cerr, scopeTyVars );
1286	// std::cerr << *env << std::endl;
1287	// change the application so it calls the adapter rather than the passed function
1288	ret = applyAdapter( appExpr, function, arg, scopeTyVars );
1289	} // if
1290	arg = appExpr->get_args().begin();
1291
1292	passTypeVars( appExpr, polyRetType, arg, exprTyVars );
1293	addInferredParams( appExpr, function, arg, exprTyVars );
1294
1295	arg = paramBegin;
1296
1297	boxParams( appExpr, function, arg, exprTyVars );
1298	passAdapters( appExpr, function, exprTyVars );
1299
1300	return ret;
1301	}
1302
1303	Expression Pass1::mutate( UntypedExpr expr ) {
1304	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
1305	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
1306	if ( name->get_name() == "*?" ) {
1307	Expression *ret = expr->get_args().front();
1308	expr->get_args().clear();
1309	delete expr;
1310	return ret->acceptMutator( *this );
1311	} // if
1312	} // if
1313	} // if
1314	return PolyMutator::mutate( expr );
1315	}
1316
1317	Expression Pass1::mutate( AddressExpr addrExpr ) {
1318	assert( ! addrExpr->get_arg()->get_results().empty() );
1319
1320	bool needs = false;
1321	if ( UntypedExpr expr = dynamic_cast< UntypedExpr >( addrExpr->get_arg() ) ) {
1322	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
1323	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
1324	if ( name->get_name() == "*?" ) {
1325	if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr->get_args().front() ) ) {
1326	assert( ! appExpr->get_function()->get_results().empty() );
1327	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
1328	assert( pointer );
1329	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
1330	assert( function );
1331	needs = needsAdapter( function, scopeTyVars );
1332	} // if
1333	} // if
1334	} // if
1335	} // if
1336	} // if
1337	// isPolyType check needs to happen before mutating addrExpr arg, so pull it forward
1338	// out of the if condition.
1339	bool polytype = isPolyType( addrExpr->get_arg()->get_results().front(), scopeTyVars, env );
1340	addrExpr->set_arg( mutateExpression( addrExpr->get_arg() ) );
1341	if ( polytype \|\| needs ) {
1342	Expression *ret = addrExpr->get_arg();
1343	delete ret->get_results().front();
1344	ret->get_results().front() = addrExpr->get_results().front()->clone();
1345	addrExpr->set_arg( 0 );
1346	delete addrExpr;
1347	return ret;
1348	} else {
1349	return addrExpr;
1350	} // if
1351	}
1352
1353	/// Wraps a function declaration in a new pointer-to-function variable expression
1354	VariableExpr wrapFunctionDecl( DeclarationWithType functionDecl ) {
1355	// line below cloned from FixFunction.cc
1356	// xxx - functionObj is never added to a list of declarations...
1357	ObjectDecl *functionObj = new ObjectDecl( functionDecl->get_name(), functionDecl->get_storageClass(), functionDecl->get_linkage(), 0,
1358	new PointerType( Type::Qualifiers(), functionDecl->get_type()->clone() ), 0 );
1359	functionObj->set_mangleName( functionDecl->get_mangleName() );
1360	functionObj->set_scopeLevel( functionDecl->get_scopeLevel() );
1361	return new VariableExpr( functionObj );
1362	}
1363
1364	/// Finds the operation declaration for a given type in one of the two maps
1365	DeclarationWithType* findOpForType( Type formalType, const ScopedMap< std::string, DeclarationWithType >& ops, ResolvExpr::TypeMap< DeclarationWithType >& scopedOps ) {
1366	if ( TypeInstType formalTypeInstType = dynamic_cast< TypeInstType >( formalType ) ) {
1367	ScopedMap< std::string, DeclarationWithType *>::const_iterator opIt = ops.find( formalTypeInstType->get_name() );
1368	return opIt == ops.end() ? 0 : opIt->second;
1369	} else {
1370	return scopedOps.find( formalType );
1371	}
1372	}
1373
1374	/// Adds an assertion parameter to the application expression for the actual assertion declaration valued with the assert op
1375	void addAssertionFor( ApplicationExpr appExpr, DeclarationWithType actualDecl, DeclarationWithType *assertOp ) {
1376	appExpr->get_inferParams()[ actualDecl->get_uniqueId() ]
1377	= ParamEntry( assertOp->get_uniqueId(), assertOp->get_type()->clone(), actualDecl->get_type()->clone(), wrapFunctionDecl( assertOp ) );
1378	}
1379
1380	Statement * Pass1::mutate( ReturnStmt *returnStmt ) {
1381	if ( retval && returnStmt->get_expr() ) {
1382	assert( ! returnStmt->get_expr()->get_results().empty() );
1383	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
1384	// if ( returnStmt->get_expr()->get_results().front()->get_isLvalue() ) {
1385	// by this point, a cast expr on a polymorphic return value is redundant
1386	while ( CastExpr castExpr = dynamic_cast< CastExpr >( returnStmt->get_expr() ) ) {
1387	returnStmt->set_expr( castExpr->get_arg() );
1388	returnStmt->get_expr()->set_env( castExpr->get_env() );
1389	castExpr->set_env( 0 );
1390	castExpr->set_arg( 0 );
1391	delete castExpr;
1392	} //while
1393
1394	// find assignment operator for (polymorphic) return type
1395	ApplicationExpr *assignExpr = 0;
1396	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( retval->get_type() ) ) {
1397	// find assignment operator for type variable
1398	ScopedMap< std::string, DeclarationWithType *>::const_iterator assignIter = assignOps.find( typeInst->get_name() );
1399	if ( assignIter == assignOps.end() ) {
1400	throw SemanticError( "Attempt to return dtype or ftype object in ", returnStmt->get_expr() );
1401	} // if
1402	assignExpr = new ApplicationExpr( new VariableExpr( assignIter->second ) );
1403	} else if ( ReferenceToType refType = dynamic_cast< ReferenceToType >( retval->get_type() ) ) {
1404	// find assignment operator for generic type
1405	DeclarationWithType *functionDecl = scopedAssignOps.find( refType );
1406	if ( ! functionDecl ) {
1407	throw SemanticError( "Attempt to return dtype or ftype generic object in ", returnStmt->get_expr() );
1408	}
1409
1410	// wrap it up in an application expression
1411	assignExpr = new ApplicationExpr( wrapFunctionDecl( functionDecl ) );
1412	assignExpr->set_env( env->clone() );
1413
1414	// find each of its needed secondary assignment operators
1415	std::list< Expression* > &tyParams = refType->get_parameters();
1416	std::list< TypeDecl* > &forallParams = functionDecl->get_type()->get_forall();
1417	std::list< Expression* >::const_iterator tyIt = tyParams.begin();
1418	std::list< TypeDecl* >::const_iterator forallIt = forallParams.begin();
1419	for ( ; tyIt != tyParams.end() && forallIt != forallParams.end(); ++tyIt, ++forallIt ) {
1420	// Add appropriate mapping to assignment expression environment
1421	TypeExpr formalTypeExpr = dynamic_cast< TypeExpr >( *tyIt );
1422	assert( formalTypeExpr && "type parameters must be type expressions" );
1423	Type *formalType = formalTypeExpr->get_type();
1424	assignExpr->get_env()->add( (*forallIt)->get_name(), formalType );
1425
1426	// skip non-otype parameters (ftype/dtype)
1427	if ( (*forallIt)->get_kind() != TypeDecl::Any ) continue;
1428
1429	// find otype operators for formal type
1430	DeclarationWithType *assertAssign = findOpForType( formalType, assignOps, scopedAssignOps );
1431	if ( ! assertAssign ) throw SemanticError( "No assignment operation found for ", formalType );
1432
1433	DeclarationWithType *assertCtor = findOpForType( formalType, ctorOps, scopedCtorOps );
1434	if ( ! assertCtor ) throw SemanticError( "No default constructor found for ", formalType );
1435
1436	DeclarationWithType *assertCopy = findOpForType( formalType, copyOps, scopedCopyOps );
1437	if ( ! assertCopy ) throw SemanticError( "No copy constructor found for ", formalType );
1438
1439	DeclarationWithType *assertDtor = findOpForType( formalType, dtorOps, scopedDtorOps );
1440	if ( ! assertDtor ) throw SemanticError( "No destructor found for ", formalType );
1441
1442	// add inferred parameters for otype operators to assignment expression
1443	// NOTE: Code here assumes that first four assertions are assign op, ctor, copy ctor, dtor, in that order
1444	std::list< DeclarationWithType* > &asserts = (*forallIt)->get_assertions();
1445	assert( asserts.size() >= 4 && "Type param needs otype operator assertions" );
1446
1447	std::list< DeclarationWithType* >::iterator actualIt = asserts.begin();
1448	addAssertionFor( assignExpr, *actualIt, assertAssign );
1449	++actualIt;
1450	addAssertionFor( assignExpr, *actualIt, assertCtor );
1451	++actualIt;
1452	addAssertionFor( assignExpr, *actualIt, assertCopy );
1453	++actualIt;
1454	addAssertionFor( assignExpr, *actualIt, assertDtor );
1455
1456	}
1457	}
1458	assert( assignExpr );
1459
1460	// replace return statement with appropriate assignment to out parameter
1461	Expression *retParm = new NameExpr( retval->get_name() );
1462	retParm->get_results().push_back( new PointerType( Type::Qualifiers(), retval->get_type()->clone() ) );
1463	assignExpr->get_args().push_back( retParm );
1464	assignExpr->get_args().push_back( returnStmt->get_expr() );
1465	stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( assignExpr ) ) );
1466	// } else {
1467	// useRetval = true;
1468	// stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( returnStmt->get_expr() ) ) );
1469	// useRetval = false;
1470	// } // if
1471	returnStmt->set_expr( 0 );
1472	} else {
1473	returnStmt->set_expr( mutateExpression( returnStmt->get_expr() ) );
1474	} // if
1475	return returnStmt;
1476	}
1477
1478	Type * Pass1::mutate( PointerType *pointerType ) {
1479	scopeTyVars.beginScope();
1480	makeTyVarMap( pointerType, scopeTyVars );
1481
1482	Type *ret = Mutator::mutate( pointerType );
1483
1484	scopeTyVars.endScope();
1485	return ret;
1486	}
1487
1488	Type * Pass1::mutate( FunctionType *functionType ) {
1489	scopeTyVars.beginScope();
1490	makeTyVarMap( functionType, scopeTyVars );
1491
1492	Type *ret = Mutator::mutate( functionType );
1493
1494	scopeTyVars.endScope();
1495	return ret;
1496	}
1497
1498	void Pass1::doBeginScope() {
1499	adapters.beginScope();
1500	scopedAssignOps.beginScope();
1501	scopedCtorOps.beginScope();
1502	scopedCopyOps.beginScope();
1503	scopedDtorOps.beginScope();
1504	}
1505
1506	void Pass1::doEndScope() {
1507	adapters.endScope();
1508	scopedAssignOps.endScope();
1509	scopedCtorOps.endScope();
1510	scopedCopyOps.endScope();
1511	scopedDtorOps.endScope();
1512	}
1513
1514	////////////////////////////////////////// Pass2 ////////////////////////////////////////////////////
1515
1516	void Pass2::addAdapters( FunctionType *functionType ) {
1517	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
1518	std::list< FunctionType *> functions;
1519	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
1520	Type orig = (arg)->get_type();
1521	findAndReplaceFunction( orig, functions, scopeTyVars, needsAdapter );
1522	(*arg)->set_type( orig );
1523	}
1524	std::set< std::string > adaptersDone;
1525	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
1526	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
1527	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
1528	std::string adapterName = makeAdapterName( mangleName );
1529	paramList.push_front( new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( *funType, scopeTyVars ) ), 0 ) );
1530	adaptersDone.insert( adaptersDone.begin(), mangleName );
1531	}
1532	}
1533	// deleteAll( functions );
1534	}
1535
1536	template< typename DeclClass >
1537	DeclClass * Pass2::handleDecl( DeclClass decl, Type type ) {
1538	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
1539
1540	return ret;
1541	}
1542
1543	DeclarationWithType * Pass2::mutate( FunctionDecl *functionDecl ) {
1544	return handleDecl( functionDecl, functionDecl->get_functionType() );
1545	}
1546
1547	ObjectDecl * Pass2::mutate( ObjectDecl *objectDecl ) {
1548	return handleDecl( objectDecl, objectDecl->get_type() );
1549	}
1550
1551	TypeDecl * Pass2::mutate( TypeDecl *typeDecl ) {
1552	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1553	if ( typeDecl->get_base() ) {
1554	return handleDecl( typeDecl, typeDecl->get_base() );
1555	} else {
1556	return Mutator::mutate( typeDecl );
1557	}
1558	}
1559
1560	TypedefDecl * Pass2::mutate( TypedefDecl *typedefDecl ) {
1561	return handleDecl( typedefDecl, typedefDecl->get_base() );
1562	}
1563
1564	Type * Pass2::mutate( PointerType *pointerType ) {
1565	scopeTyVars.beginScope();
1566	makeTyVarMap( pointerType, scopeTyVars );
1567
1568	Type *ret = Mutator::mutate( pointerType );
1569
1570	scopeTyVars.endScope();
1571	return ret;
1572	}
1573
1574	Type Pass2::mutate( FunctionType funcType ) {
1575	scopeTyVars.beginScope();
1576	makeTyVarMap( funcType, scopeTyVars );
1577
1578	// move polymorphic return type to parameter list
1579	if ( isPolyRet( funcType ) ) {
1580	DeclarationWithType *ret = funcType->get_returnVals().front();
1581	ret->set_type( new PointerType( Type::Qualifiers(), ret->get_type() ) );
1582	funcType->get_parameters().push_front( ret );
1583	funcType->get_returnVals().pop_front();
1584	}
1585
1586	// add size/align and assertions for type parameters to parameter list
1587	std::list< DeclarationWithType *>::iterator last = funcType->get_parameters().begin();
1588	std::list< DeclarationWithType *> inferredParams;
1589	ObjectDecl newObj( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), 0 );
1590	ObjectDecl newPtr( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0,
1591	new PointerType( Type::Qualifiers(), new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) ), 0 );
1592	for ( std::list< TypeDecl *>::const_iterator tyParm = funcType->get_forall().begin(); tyParm != funcType->get_forall().end(); ++tyParm ) {
1593	ObjectDecl sizeParm, alignParm;
1594	// add all size and alignment parameters to parameter list
1595	if ( (*tyParm)->get_kind() == TypeDecl::Any ) {
1596	TypeInstType parmType( Type::Qualifiers(), (tyParm)->get_name(), tyParm );
1597	std::string parmName = mangleType( &parmType );
1598
1599	sizeParm = newObj.clone();
1600	sizeParm->set_name( sizeofName( parmName ) );
1601	last = funcType->get_parameters().insert( last, sizeParm );
1602	++last;
1603
1604	alignParm = newObj.clone();
1605	alignParm->set_name( alignofName( parmName ) );
1606	last = funcType->get_parameters().insert( last, alignParm );
1607	++last;
1608	}
1609	// move all assertions into parameter list
1610	for ( std::list< DeclarationWithType >::iterator assert = (tyParm)->get_assertions().begin(); assert != (*tyParm)->get_assertions().end(); ++assert ) {
1611	// assert = (assert)->acceptMutator( *this );
1612	inferredParams.push_back( *assert );
1613	}
1614	(*tyParm)->get_assertions().clear();
1615	}
1616
1617	// add size/align for generic parameter types to parameter list
1618	std::set< std::string > seenTypes; // sizeofName for generic types we've seen
1619	for ( std::list< DeclarationWithType* >::const_iterator fnParm = last; fnParm != funcType->get_parameters().end(); ++fnParm ) {
1620	Type polyType = isPolyType( (fnParm)->get_type(), scopeTyVars );
1621	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
1622	std::string typeName = mangleType( polyType );
1623	if ( seenTypes.count( typeName ) ) continue;
1624
1625	ObjectDecl sizeParm, alignParm, *offsetParm;
1626	sizeParm = newObj.clone();
1627	sizeParm->set_name( sizeofName( typeName ) );
1628	last = funcType->get_parameters().insert( last, sizeParm );
1629	++last;
1630
1631	alignParm = newObj.clone();
1632	alignParm->set_name( alignofName( typeName ) );
1633	last = funcType->get_parameters().insert( last, alignParm );
1634	++last;
1635
1636	if ( StructInstType polyBaseStruct = dynamic_cast< StructInstType >( polyType ) ) {
1637	// NOTE zero-length arrays are illegal in C, so empty structs have no offset array
1638	if ( ! polyBaseStruct->get_baseStruct()->get_members().empty() ) {
1639	offsetParm = newPtr.clone();
1640	offsetParm->set_name( offsetofName( typeName ) );
1641	last = funcType->get_parameters().insert( last, offsetParm );
1642	++last;
1643	}
1644	}
1645
1646	seenTypes.insert( typeName );
1647	}
1648	}
1649
1650	// splice assertion parameters into parameter list
1651	funcType->get_parameters().splice( last, inferredParams );
1652	addAdapters( funcType );
1653	mutateAll( funcType->get_returnVals(), *this );
1654	mutateAll( funcType->get_parameters(), *this );
1655
1656	scopeTyVars.endScope();
1657	return funcType;
1658	}
1659
1660	////////////////////////////////////////// PolyGenericCalculator ////////////////////////////////////////////////////
1661
1662	void PolyGenericCalculator::beginTypeScope( Type *ty ) {
1663	scopeTyVars.beginScope();
1664	makeTyVarMap( ty, scopeTyVars );
1665	}
1666
1667	void PolyGenericCalculator::endTypeScope() {
1668	scopeTyVars.endScope();
1669	}
1670
1671	template< typename DeclClass >
1672	DeclClass * PolyGenericCalculator::handleDecl( DeclClass decl, Type type ) {
1673	beginTypeScope( type );
1674	knownLayouts.beginScope();
1675	knownOffsets.beginScope();
1676
1677	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
1678
1679	knownOffsets.endScope();
1680	knownLayouts.endScope();
1681	endTypeScope();
1682	return ret;
1683	}
1684
1685	ObjectDecl * PolyGenericCalculator::mutate( ObjectDecl *objectDecl ) {
1686	return handleDecl( objectDecl, objectDecl->get_type() );
1687	}
1688
1689	DeclarationWithType * PolyGenericCalculator::mutate( FunctionDecl *functionDecl ) {
1690	return handleDecl( functionDecl, functionDecl->get_functionType() );
1691	}
1692
1693	TypedefDecl * PolyGenericCalculator::mutate( TypedefDecl *typedefDecl ) {
1694	return handleDecl( typedefDecl, typedefDecl->get_base() );
1695	}
1696
1697	TypeDecl * PolyGenericCalculator::mutate( TypeDecl *typeDecl ) {
1698	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1699	return Mutator::mutate( typeDecl );
1700	}
1701
1702	Type * PolyGenericCalculator::mutate( PointerType *pointerType ) {
1703	beginTypeScope( pointerType );
1704
1705	Type *ret = Mutator::mutate( pointerType );
1706
1707	endTypeScope();
1708	return ret;
1709	}
1710
1711	Type * PolyGenericCalculator::mutate( FunctionType *funcType ) {
1712	beginTypeScope( funcType );
1713
1714	// make sure that any type information passed into the function is accounted for
1715	for ( std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin(); fnParm != funcType->get_parameters().end(); ++fnParm ) {
1716	// condition here duplicates that in Pass2::mutate( FunctionType* )
1717	Type polyType = isPolyType( (fnParm)->get_type(), scopeTyVars );
1718	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
1719	knownLayouts.insert( mangleType( polyType ) );
1720	}
1721	}
1722
1723	Type *ret = Mutator::mutate( funcType );
1724
1725	endTypeScope();
1726	return ret;
1727	}
1728
1729	Statement PolyGenericCalculator::mutate( DeclStmt declStmt ) {
1730	if ( ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( declStmt->get_decl() ) ) {
1731	if ( findGeneric( objectDecl->get_type() ) ) {
1732	// change initialization of a polymorphic value object
1733	// to allocate storage with alloca
1734	Type *declType = objectDecl->get_type();
1735	UntypedExpr *alloc = new UntypedExpr( new NameExpr( "__builtin_alloca" ) );
1736	alloc->get_args().push_back( new NameExpr( sizeofName( mangleType( declType ) ) ) );
1737
1738	delete objectDecl->get_init();
1739
1740	std::list<Expression*> designators;
1741	objectDecl->set_init( new SingleInit( alloc, designators, false ) ); // not constructed
1742	}
1743	}
1744	return Mutator::mutate( declStmt );
1745	}
1746
1747	/// Finds the member in the base list that matches the given declaration; returns its index, or -1 if not present
1748	long findMember( DeclarationWithType memberDecl, std::list< Declaration > &baseDecls ) {
1749	long i = 0;
1750	for(std::list< Declaration* >::const_iterator decl = baseDecls.begin(); decl != baseDecls.end(); ++decl, ++i ) {
1751	if ( memberDecl->get_name() != (*decl)->get_name() ) continue;
1752
1753	if ( DeclarationWithType declWithType = dynamic_cast< DeclarationWithType >( *decl ) ) {
1754	if ( memberDecl->get_mangleName().empty() \|\| declWithType->get_mangleName().empty()
1755	\|\| memberDecl->get_mangleName() == declWithType->get_mangleName() ) return i;
1756	else continue;
1757	} else return i;
1758	}
1759	return -1;
1760	}
1761
1762	/// Returns an index expression into the offset array for a type
1763	Expression makeOffsetIndex( Type objectType, long i ) {
1764	std::stringstream offset_namer;
1765	offset_namer << i;
1766	ConstantExpr *fieldIndex = new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), offset_namer.str() ) );
1767	UntypedExpr *fieldOffset = new UntypedExpr( new NameExpr( "?[?]" ) );
1768	fieldOffset->get_args().push_back( new NameExpr( offsetofName( mangleType( objectType ) ) ) );
1769	fieldOffset->get_args().push_back( fieldIndex );
1770	return fieldOffset;
1771	}
1772
1773	/// Returns an expression dereferenced n times
1774	Expression makeDerefdVar( Expression derefdVar, long n ) {
1775	for ( int i = 1; i < n; ++i ) {
1776	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
1777	derefExpr->get_args().push_back( derefdVar );
1778	// xxx - should set results on derefExpr
1779	derefdVar = derefExpr;
1780	}
1781	return derefdVar;
1782	}
1783
1784	Expression PolyGenericCalculator::mutate( MemberExpr memberExpr ) {
1785	// mutate, exiting early if no longer MemberExpr
1786	Expression *expr = Mutator::mutate( memberExpr );
1787	memberExpr = dynamic_cast< MemberExpr* >( expr );
1788	if ( ! memberExpr ) return expr;
1789
1790	// get declaration for base struct, exiting early if not found
1791	int varDepth;
1792	VariableExpr *varExpr = getBaseVar( memberExpr->get_aggregate(), &varDepth );
1793	if ( ! varExpr ) return memberExpr;
1794	ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( varExpr->get_var() );
1795	if ( ! objectDecl ) return memberExpr;
1796
1797	// only mutate member expressions for polymorphic types
1798	int tyDepth;
1799	Type *objectType = hasPolyBase( objectDecl->get_type(), scopeTyVars, &tyDepth );
1800	if ( ! objectType ) return memberExpr;
1801	findGeneric( objectType ); // ensure layout for this type is available
1802
1803	// replace member expression with dynamically-computed layout expression
1804	Expression *newMemberExpr = 0;
1805	if ( StructInstType structType = dynamic_cast< StructInstType >( objectType ) ) {
1806	// look up offset index
1807	long i = findMember( memberExpr->get_member(), structType->get_baseStruct()->get_members() );
1808	if ( i == -1 ) return memberExpr;
1809
1810	// replace member expression with pointer to base plus offset
1811	UntypedExpr *fieldLoc = new UntypedExpr( new NameExpr( "?+?" ) );
1812	fieldLoc->get_args().push_back( makeDerefdVar( varExpr->clone(), varDepth ) );
1813	fieldLoc->get_args().push_back( makeOffsetIndex( objectType, i ) );
1814	newMemberExpr = fieldLoc;
1815	} else if ( dynamic_cast< UnionInstType* >( objectType ) ) {
1816	// union members are all at offset zero, so build appropriately-dereferenced variable
1817	newMemberExpr = makeDerefdVar( varExpr->clone(), varDepth );
1818	} else return memberExpr;
1819	assert( newMemberExpr );
1820
1821	Type *memberType = memberExpr->get_member()->get_type();
1822	if ( ! isPolyType( memberType, scopeTyVars ) ) {
1823	// 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
1824	CastExpr *ptrCastExpr = new CastExpr( newMemberExpr, new PointerType( Type::Qualifiers(), memberType->clone() ) );
1825	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
1826	derefExpr->get_args().push_back( ptrCastExpr );
1827	newMemberExpr = derefExpr;
1828	}
1829
1830	delete memberExpr;
1831	return newMemberExpr;
1832	}
1833
1834	ObjectDecl PolyGenericCalculator::makeVar( const std::string &name, Type type, Initializer *init ) {
1835	ObjectDecl *newObj = new ObjectDecl( name, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, init );
1836	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
1837	return newObj;
1838	}
1839
1840	void PolyGenericCalculator::addOtypeParamsToLayoutCall( UntypedExpr layoutCall, const std::list< Type > &otypeParams ) {
1841	for ( std::list< Type* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
1842	if ( findGeneric( *param ) ) {
1843	// push size/align vars for a generic parameter back
1844	std::string paramName = mangleType( *param );
1845	layoutCall->get_args().push_back( new NameExpr( sizeofName( paramName ) ) );
1846	layoutCall->get_args().push_back( new NameExpr( alignofName( paramName ) ) );
1847	} else {
1848	layoutCall->get_args().push_back( new SizeofExpr( (*param)->clone() ) );
1849	layoutCall->get_args().push_back( new AlignofExpr( (*param)->clone() ) );
1850	}
1851	}
1852	}
1853
1854	/// returns true if any of the otype parameters have a dynamic layout and puts all otype parameters in the output list
1855	bool findGenericParams( std::list< TypeDecl* > &baseParams, std::list< Expression* > &typeParams, std::list< Type* > &out ) {
1856	bool hasDynamicLayout = false;
1857
1858	std::list< TypeDecl* >::const_iterator baseParam = baseParams.begin();
1859	std::list< Expression* >::const_iterator typeParam = typeParams.begin();
1860	for ( ; baseParam != baseParams.end() && typeParam != typeParams.end(); ++baseParam, ++typeParam ) {
1861	// skip non-otype parameters
1862	if ( (*baseParam)->get_kind() != TypeDecl::Any ) continue;
1863	TypeExpr typeExpr = dynamic_cast< TypeExpr >( *typeParam );
1864	assert( typeExpr && "all otype parameters should be type expressions" );
1865
1866	Type *type = typeExpr->get_type();
1867	out.push_back( type );
1868	if ( isPolyType( type ) ) hasDynamicLayout = true;
1869	}
1870	assert( baseParam == baseParams.end() && typeParam == typeParams.end() );
1871
1872	return hasDynamicLayout;
1873	}
1874
1875	bool PolyGenericCalculator::findGeneric( Type *ty ) {
1876	ty = replaceTypeInst( ty, env );
1877
1878	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( ty ) ) {
1879	if ( scopeTyVars.find( typeInst->get_name() ) != scopeTyVars.end() ) {
1880	// NOTE assumes here that getting put in the scopeTyVars included having the layout variables set
1881	return true;
1882	}
1883	return false;
1884	} else if ( StructInstType structTy = dynamic_cast< StructInstType >( ty ) ) {
1885	// check if this type already has a layout generated for it
1886	std::string typeName = mangleType( ty );
1887	if ( knownLayouts.find( typeName ) != knownLayouts.end() ) return true;
1888
1889	// check if any of the type parameters have dynamic layout; if none do, this type is (or will be) monomorphized
1890	std::list< Type* > otypeParams;
1891	if ( ! findGenericParams( *structTy->get_baseParameters(), structTy->get_parameters(), otypeParams ) ) return false;
1892
1893	// insert local variables for layout and generate call to layout function
1894	knownLayouts.insert( typeName ); // done early so as not to interfere with the later addition of parameters to the layout call
1895	Type *layoutType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
1896
1897	int n_members = structTy->get_baseStruct()->get_members().size();
1898	if ( n_members == 0 ) {
1899	// all empty structs have the same layout - size 1, align 1
1900	makeVar( sizeofName( typeName ), layoutType, new SingleInit( new ConstantExpr( Constant::from_ulong( (unsigned long)1 ) ) ) );
1901	makeVar( alignofName( typeName ), layoutType->clone(), new SingleInit( new ConstantExpr( Constant::from_ulong( (unsigned long)1 ) ) ) );
1902	// NOTE zero-length arrays are forbidden in C, so empty structs have no offsetof array
1903	} else {
1904	ObjectDecl *sizeVar = makeVar( sizeofName( typeName ), layoutType );
1905	ObjectDecl *alignVar = makeVar( alignofName( typeName ), layoutType->clone() );
1906	ObjectDecl *offsetVar = makeVar( offsetofName( typeName ), new ArrayType( Type::Qualifiers(), layoutType->clone(), new ConstantExpr( Constant::from_int( n_members ) ), false, false ) );
1907
1908	// generate call to layout function
1909	UntypedExpr *layoutCall = new UntypedExpr( new NameExpr( layoutofName( structTy->get_baseStruct() ) ) );
1910	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( sizeVar ) ) );
1911	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( alignVar ) ) );
1912	layoutCall->get_args().push_back( new VariableExpr( offsetVar ) );
1913	addOtypeParamsToLayoutCall( layoutCall, otypeParams );
1914
1915	stmtsToAdd.push_back( new ExprStmt( noLabels, layoutCall ) );
1916	}
1917
1918	return true;
1919	} else if ( UnionInstType unionTy = dynamic_cast< UnionInstType >( ty ) ) {
1920	// check if this type already has a layout generated for it
1921	std::string typeName = mangleType( ty );
1922	if ( knownLayouts.find( typeName ) != knownLayouts.end() ) return true;
1923
1924	// check if any of the type parameters have dynamic layout; if none do, this type is (or will be) monomorphized
1925	std::list< Type* > otypeParams;
1926	if ( ! findGenericParams( *unionTy->get_baseParameters(), unionTy->get_parameters(), otypeParams ) ) return false;
1927
1928	// insert local variables for layout and generate call to layout function
1929	knownLayouts.insert( typeName ); // done early so as not to interfere with the later addition of parameters to the layout call
1930	Type *layoutType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
1931
1932	ObjectDecl *sizeVar = makeVar( sizeofName( typeName ), layoutType );
1933	ObjectDecl *alignVar = makeVar( alignofName( typeName ), layoutType->clone() );
1934
1935	// generate call to layout function
1936	UntypedExpr *layoutCall = new UntypedExpr( new NameExpr( layoutofName( unionTy->get_baseUnion() ) ) );
1937	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( sizeVar ) ) );
1938	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( alignVar ) ) );
1939	addOtypeParamsToLayoutCall( layoutCall, otypeParams );
1940
1941	stmtsToAdd.push_back( new ExprStmt( noLabels, layoutCall ) );
1942
1943	return true;
1944	}
1945
1946	return false;
1947	}
1948
1949	Expression PolyGenericCalculator::mutate( SizeofExpr sizeofExpr ) {
1950	Type *ty = sizeofExpr->get_type();
1951	if ( findGeneric( ty ) ) {
1952	Expression *ret = new NameExpr( sizeofName( mangleType( ty ) ) );
1953	delete sizeofExpr;
1954	return ret;
1955	}
1956	return sizeofExpr;
1957	}
1958
1959	Expression PolyGenericCalculator::mutate( AlignofExpr alignofExpr ) {
1960	Type *ty = alignofExpr->get_type();
1961	if ( findGeneric( ty ) ) {
1962	Expression *ret = new NameExpr( alignofName( mangleType( ty ) ) );
1963	delete alignofExpr;
1964	return ret;
1965	}
1966	return alignofExpr;
1967	}
1968
1969	Expression PolyGenericCalculator::mutate( OffsetofExpr offsetofExpr ) {
1970	// mutate, exiting early if no longer OffsetofExpr
1971	Expression *expr = Mutator::mutate( offsetofExpr );
1972	offsetofExpr = dynamic_cast< OffsetofExpr* >( expr );
1973	if ( ! offsetofExpr ) return expr;
1974
1975	// only mutate expressions for polymorphic structs/unions
1976	Type *ty = offsetofExpr->get_type();
1977	if ( ! findGeneric( ty ) ) return offsetofExpr;
1978
1979	if ( StructInstType structType = dynamic_cast< StructInstType >( ty ) ) {
1980	// replace offsetof expression by index into offset array
1981	long i = findMember( offsetofExpr->get_member(), structType->get_baseStruct()->get_members() );
1982	if ( i == -1 ) return offsetofExpr;
1983
1984	Expression *offsetInd = makeOffsetIndex( ty, i );
1985	delete offsetofExpr;
1986	return offsetInd;
1987	} else if ( dynamic_cast< UnionInstType* >( ty ) ) {
1988	// all union members are at offset zero
1989	delete offsetofExpr;
1990	return new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), "0" ) );
1991	} else return offsetofExpr;
1992	}
1993
1994	Expression PolyGenericCalculator::mutate( OffsetPackExpr offsetPackExpr ) {
1995	StructInstType *ty = offsetPackExpr->get_type();
1996
1997	Expression *ret = 0;
1998	if ( findGeneric( ty ) ) {
1999	// pull offset back from generated type information
2000	ret = new NameExpr( offsetofName( mangleType( ty ) ) );
2001	} else {
2002	std::string offsetName = offsetofName( mangleType( ty ) );
2003	if ( knownOffsets.find( offsetName ) != knownOffsets.end() ) {
2004	// use the already-generated offsets for this type
2005	ret = new NameExpr( offsetName );
2006	} else {
2007	knownOffsets.insert( offsetName );
2008
2009	std::list< Declaration* > &baseMembers = ty->get_baseStruct()->get_members();
2010	Type *offsetType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
2011
2012	// build initializer list for offset array
2013	std::list< Initializer* > inits;
2014	for ( std::list< Declaration* >::const_iterator member = baseMembers.begin(); member != baseMembers.end(); ++member ) {
2015	DeclarationWithType *memberDecl;
2016	if ( DeclarationWithType origMember = dynamic_cast< DeclarationWithType >( *member ) ) {
2017	memberDecl = origMember->clone();
2018	} else {
2019	memberDecl = new ObjectDecl( (*member)->get_name(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, offsetType->clone(), 0 );
2020	}
2021	inits.push_back( new SingleInit( new OffsetofExpr( ty->clone(), memberDecl ) ) );
2022	}
2023
2024	// build the offset array and replace the pack with a reference to it
2025	ObjectDecl *offsetArray = makeVar( offsetName, new ArrayType( Type::Qualifiers(), offsetType, new ConstantExpr( Constant::from_ulong( baseMembers.size() ) ), false, false ),
2026	new ListInit( inits ) );
2027	ret = new VariableExpr( offsetArray );
2028	}
2029	}
2030
2031	delete offsetPackExpr;
2032	return ret;
2033	}
2034
2035	void PolyGenericCalculator::doBeginScope() {
2036	knownLayouts.beginScope();
2037	knownOffsets.beginScope();
2038	}
2039
2040	void PolyGenericCalculator::doEndScope() {
2041	knownLayouts.endScope();
2042	knownOffsets.endScope();
2043	}
2044
2045	////////////////////////////////////////// Pass3 ////////////////////////////////////////////////////
2046
2047	template< typename DeclClass >
2048	DeclClass * Pass3::handleDecl( DeclClass decl, Type type ) {
2049	scopeTyVars.beginScope();
2050	makeTyVarMap( type, scopeTyVars );
2051
2052	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
2053	ScrubTyVars::scrub( decl, scopeTyVars );
2054
2055	scopeTyVars.endScope();
2056	return ret;
2057	}
2058
2059	ObjectDecl * Pass3::mutate( ObjectDecl *objectDecl ) {
2060	return handleDecl( objectDecl, objectDecl->get_type() );
2061	}
2062
2063	DeclarationWithType * Pass3::mutate( FunctionDecl *functionDecl ) {
2064	return handleDecl( functionDecl, functionDecl->get_functionType() );
2065	}
2066
2067	TypedefDecl * Pass3::mutate( TypedefDecl *typedefDecl ) {
2068	return handleDecl( typedefDecl, typedefDecl->get_base() );
2069	}
2070
2071	TypeDecl * Pass3::mutate( TypeDecl *typeDecl ) {
2072	// Initializer *init = 0;
2073	// std::list< Expression *> designators;
2074	// scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
2075	// if ( typeDecl->get_base() ) {
2076	// init = new SimpleInit( new SizeofExpr( handleDecl( typeDecl, typeDecl->get_base() ) ), designators );
2077	// }
2078	// return new ObjectDecl( typeDecl->get_name(), Declaration::Extern, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::UnsignedInt ), init );
2079
2080	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
2081	return Mutator::mutate( typeDecl );
2082	}
2083
2084	Type * Pass3::mutate( PointerType *pointerType ) {
2085	scopeTyVars.beginScope();
2086	makeTyVarMap( pointerType, scopeTyVars );
2087
2088	Type *ret = Mutator::mutate( pointerType );
2089
2090	scopeTyVars.endScope();
2091	return ret;
2092	}
2093
2094	Type * Pass3::mutate( FunctionType *functionType ) {
2095	scopeTyVars.beginScope();
2096	makeTyVarMap( functionType, scopeTyVars );
2097
2098	Type *ret = Mutator::mutate( functionType );
2099
2100	scopeTyVars.endScope();
2101	return ret;
2102	}
2103	} // anonymous namespace
2104	} // namespace GenPoly
2105
2106	// Local Variables: //
2107	// tab-width: 4 //
2108	// mode: c++ //
2109	// compile-command: "make install" //
2110	// End: //

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