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source: src/GenPoly/Box.cc @ 2042d41

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

Last change on this file since 2042d41 was 62e5546, checked in by Thierry Delisle <tdelisle@…>, 8 years ago
Removed warnings when compiling with clang
Property mode set to `100644`
File size: 97.1 KB

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1	//
2	// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
3	//
4	// The contents of this file are covered under the licence agreement in the
5	// file "LICENCE" distributed with Cforall.
6	//
7	// Box.cc --
8	//
9	// Author : Richard C. Bilson
10	// Created On : Mon May 18 07:44:20 2015
11	// Last Modified By : Peter A. Buhr
12	// Last Modified On : 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 "ScopedSet.h"
32	#include "ScrubTyVars.h"
33
34	#include "Parser/ParseNode.h"
35
36	#include "SynTree/Constant.h"
37	#include "SynTree/Declaration.h"
38	#include "SynTree/Expression.h"
39	#include "SynTree/Initializer.h"
40	#include "SynTree/Mutator.h"
41	#include "SynTree/Statement.h"
42	#include "SynTree/Type.h"
43	#include "SynTree/TypeSubstitution.h"
44
45	#include "ResolvExpr/TypeEnvironment.h"
46	#include "ResolvExpr/TypeMap.h"
47	#include "ResolvExpr/typeops.h"
48
49	#include "SymTab/Indexer.h"
50	#include "SymTab/Mangler.h"
51
52	#include "Common/ScopedMap.h"
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 final : public DeclMutator {
67	unsigned int functionNesting; // current level of nested functions
68	public:
69	LayoutFunctionBuilder() : functionNesting( 0 ) {}
70
71	using DeclMutator::mutate;
72	virtual DeclarationWithType mutate( FunctionDecl functionDecl ) override;
73	virtual Declaration mutate( StructDecl structDecl ) override;
74	virtual Declaration mutate( UnionDecl unionDecl ) override;
75	};
76
77	/// 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
78	class Pass1 final : public PolyMutator {
79	public:
80	Pass1();
81
82	using PolyMutator::mutate;
83	virtual Expression mutate( ApplicationExpr appExpr ) override;
84	virtual Expression mutate( AddressExpr addrExpr ) override;
85	virtual Expression mutate( UntypedExpr expr ) override;
86	virtual DeclarationWithType* mutate( FunctionDecl *functionDecl ) override;
87	virtual TypeDecl mutate( TypeDecl typeDecl ) override;
88	virtual Expression mutate( CommaExpr commaExpr ) override;
89	virtual Expression mutate( ConditionalExpr condExpr ) override;
90	virtual Statement * mutate( ReturnStmt *returnStmt ) override;
91	virtual Type mutate( PointerType pointerType ) override;
92	virtual Type * mutate( FunctionType *functionType ) override;
93
94	virtual void doBeginScope() override;
95	virtual void doEndScope() override;
96	private:
97	/// Pass the extra type parameters from polymorphic generic arguments or return types into a function application
98	void passArgTypeVars( ApplicationExpr appExpr, Type parmType, Type argBaseType, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars, std::set< std::string > &seenTypes );
99	/// passes extra type parameters into a polymorphic function application
100	void passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars );
101	/// wraps a function application with a new temporary for the out-parameter return value
102	Expression addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg );
103	/// Replaces all the type parameters of a generic type with their concrete equivalents under the current environment
104	void replaceParametersWithConcrete( ApplicationExpr appExpr, std::list< Expression >& params );
105	/// Replaces a polymorphic type with its concrete equivalant under the current environment (returns itself if concrete).
106	/// If `doClone` is set to false, will not clone interior types
107	Type replaceWithConcrete( ApplicationExpr appExpr, Type *type, bool doClone = true );
108	/// wraps a function application returning a polymorphic type with a new temporary for the out-parameter return value
109	Expression addDynRetParam( ApplicationExpr appExpr, FunctionType function, ReferenceToType polyType, std::list< Expression *>::iterator &arg );
110	Expression applyAdapter( ApplicationExpr appExpr, FunctionType function, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars );
111	void boxParam( Type formal, Expression &arg, const TyVarMap &exprTyVars );
112	void boxParams( ApplicationExpr appExpr, FunctionType function, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars );
113	void addInferredParams( ApplicationExpr appExpr, FunctionType functionType, std::list< Expression *>::iterator &arg, const TyVarMap &tyVars );
114	/// Stores assignment operators from assertion list in local map of assignment operations
115	void findTypeOps( const std::list< TypeDecl *> &forall );
116	void passAdapters( ApplicationExpr appExpr, FunctionType functionType, const TyVarMap &exprTyVars );
117	FunctionDecl makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars );
118	/// Replaces intrinsic operator functions with their arithmetic desugaring
119	Expression handleIntrinsics( ApplicationExpr appExpr );
120	/// Inserts a new temporary variable into the current scope with an auto-generated name
121	ObjectDecl makeTemporary( Type type );
122
123	ScopedMap< std::string, DeclarationWithType* > assignOps; ///< Currently known type variable assignment operators
124	ScopedMap< std::string, DeclarationWithType* > ctorOps; ///< Currently known type variable constructors
125	ScopedMap< std::string, DeclarationWithType* > copyOps; ///< Currently known type variable copy constructors
126	ScopedMap< std::string, DeclarationWithType* > dtorOps; ///< Currently known type variable destructors
127	ResolvExpr::TypeMap< DeclarationWithType > scopedAssignOps; ///< Currently known assignment operators
128	ResolvExpr::TypeMap< DeclarationWithType > scopedCtorOps; ///< Currently known assignment operators
129	ResolvExpr::TypeMap< DeclarationWithType > scopedCopyOps; ///< Currently known assignment operators
130	ResolvExpr::TypeMap< DeclarationWithType > scopedDtorOps; ///< Currently known assignment operators
131	ScopedMap< std::string, DeclarationWithType* > adapters; ///< Set of adapter functions in the current scope
132
133	DeclarationWithType *retval;
134	bool useRetval;
135	UniqueName tempNamer;
136	};
137
138	/// * Moves polymorphic returns in function types to pointer-type parameters
139	/// * adds type size and assertion parameters to parameter lists
140	class Pass2 final : public PolyMutator {
141	public:
142	template< typename DeclClass >
143	DeclClass handleDecl( DeclClass decl, Type *type );
144
145	using PolyMutator::mutate;
146	virtual DeclarationWithType mutate( FunctionDecl functionDecl ) override;
147	virtual ObjectDecl mutate( ObjectDecl objectDecl ) override;
148	virtual TypeDecl mutate( TypeDecl typeDecl ) override;
149	virtual TypedefDecl mutate( TypedefDecl typedefDecl ) override;
150	virtual Type mutate( PointerType pointerType ) override;
151	virtual Type mutate( FunctionType funcType ) override;
152
153	private:
154	void addAdapters( FunctionType *functionType );
155
156	std::map< UniqueId, std::string > adapterName;
157	};
158
159	/// Replaces member and size/align/offsetof expressions on polymorphic generic types with calculated expressions.
160	/// * Replaces member expressions for polymorphic types with calculated add-field-offset-and-dereference
161	/// * Calculates polymorphic offsetof expressions from offset array
162	/// * Inserts dynamic calculation of polymorphic type layouts where needed
163	class PolyGenericCalculator final : public PolyMutator {
164	public:
165	typedef PolyMutator Parent;
166	using Parent::mutate;
167
168	template< typename DeclClass >
169	DeclClass handleDecl( DeclClass decl, Type *type );
170	virtual DeclarationWithType mutate( FunctionDecl functionDecl ) override;
171	virtual ObjectDecl mutate( ObjectDecl objectDecl ) override;
172	virtual TypedefDecl mutate( TypedefDecl objectDecl ) override;
173	virtual TypeDecl mutate( TypeDecl objectDecl ) override;
174	virtual Statement mutate( DeclStmt declStmt ) override;
175	virtual Type mutate( PointerType pointerType ) override;
176	virtual Type mutate( FunctionType funcType ) override;
177	virtual Expression mutate( MemberExpr memberExpr ) override;
178	virtual Expression mutate( SizeofExpr sizeofExpr ) override;
179	virtual Expression mutate( AlignofExpr alignofExpr ) override;
180	virtual Expression mutate( OffsetofExpr offsetofExpr ) override;
181	virtual Expression mutate( OffsetPackExpr offsetPackExpr ) override;
182
183	virtual void doBeginScope() override;
184	virtual void doEndScope() override;
185
186	private:
187	/// Makes a new variable in the current scope with the given name, type & optional initializer
188	ObjectDecl makeVar( const std::string &name, Type type, Initializer *init = 0 );
189	/// returns true if the type has a dynamic layout; such a layout will be stored in appropriately-named local variables when the function returns
190	bool findGeneric( Type *ty );
191	/// adds type parameters to the layout call; will generate the appropriate parameters if needed
192	void addOtypeParamsToLayoutCall( UntypedExpr layoutCall, const std::list< Type > &otypeParams );
193
194	/// Enters a new scope for type-variables, adding the type variables from ty
195	void beginTypeScope( Type *ty );
196	/// Exits the type-variable scope
197	void endTypeScope();
198
199	ScopedSet< std::string > knownLayouts; ///< Set of generic type layouts known in the current scope, indexed by sizeofName
200	ScopedSet< std::string > knownOffsets; ///< Set of non-generic types for which the offset array exists in the current scope, indexed by offsetofName
201	};
202
203	/// 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
204	class Pass3 final : public PolyMutator {
205	public:
206	template< typename DeclClass >
207	DeclClass handleDecl( DeclClass decl, Type *type );
208
209	using PolyMutator::mutate;
210	virtual DeclarationWithType mutate( FunctionDecl functionDecl ) override;
211	virtual ObjectDecl mutate( ObjectDecl objectDecl ) override;
212	virtual TypedefDecl mutate( TypedefDecl objectDecl ) override;
213	virtual TypeDecl mutate( TypeDecl objectDecl ) override;
214	virtual Type mutate( PointerType pointerType ) override;
215	virtual Type mutate( FunctionType funcType ) override;
216	private:
217	};
218
219	} // anonymous namespace
220
221	/// version of mutateAll with special handling for translation unit so you can check the end of the prelude when debugging
222	template< typename MutatorType >
223	inline void mutateTranslationUnit( std::list< Declaration* > &translationUnit, MutatorType &mutator ) {
224	bool seenIntrinsic = false;
225	SemanticError errors;
226	for ( typename std::list< Declaration* >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) {
227	try {
228	if ( *i ) {
229	if ( (*i)->get_linkage() == LinkageSpec::Intrinsic ) {
230	seenIntrinsic = true;
231	} else if ( seenIntrinsic ) {
232	seenIntrinsic = false; // break on this line when debugging for end of prelude
233	}
234
235	i = dynamic_cast< Declaration >( (*i)->acceptMutator( mutator ) );
236	assert( *i );
237	} // if
238	} catch( SemanticError &e ) {
239	errors.append( e );
240	} // try
241	} // for
242	if ( ! errors.isEmpty() ) {
243	throw errors;
244	} // if
245	}
246
247	void box( std::list< Declaration *>& translationUnit ) {
248	LayoutFunctionBuilder layoutBuilder;
249	Pass1 pass1;
250	Pass2 pass2;
251	PolyGenericCalculator polyCalculator;
252	Pass3 pass3;
253
254	layoutBuilder.mutateDeclarationList( translationUnit );
255	mutateTranslationUnit/All/( translationUnit, pass1 );
256	mutateTranslationUnit/All/( translationUnit, pass2 );
257	mutateTranslationUnit/All/( translationUnit, polyCalculator );
258	mutateTranslationUnit/All/( translationUnit, pass3 );
259	}
260
261	////////////////////////////////// LayoutFunctionBuilder ////////////////////////////////////////////
262
263	DeclarationWithType LayoutFunctionBuilder::mutate( FunctionDecl functionDecl ) {
264	functionDecl->set_functionType( maybeMutate( functionDecl->get_functionType(), *this ) );
265	mutateAll( functionDecl->get_oldDecls(), *this );
266	++functionNesting;
267	functionDecl->set_statements( maybeMutate( functionDecl->get_statements(), *this ) );
268	--functionNesting;
269	return functionDecl;
270	}
271
272	/// Get a list of type declarations that will affect a layout function
273	std::list< TypeDecl* > takeOtypeOnly( std::list< TypeDecl* > &decls ) {
274	std::list< TypeDecl * > otypeDecls;
275
276	for ( std::list< TypeDecl* >::const_iterator decl = decls.begin(); decl != decls.end(); ++decl ) {
277	if ( (*decl)->get_kind() == TypeDecl::Any ) {
278	otypeDecls.push_back( *decl );
279	}
280	}
281
282	return otypeDecls;
283	}
284
285	/// Adds parameters for otype layout to a function type
286	void addOtypeParams( FunctionType layoutFnType, std::list< TypeDecl > &otypeParams ) {
287	BasicType sizeAlignType( Type::Qualifiers(), BasicType::LongUnsignedInt );
288
289	for ( std::list< TypeDecl* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
290	TypeInstType paramType( Type::Qualifiers(), (param)->get_name(), param );
291	std::string paramName = mangleType( &paramType );
292	layoutFnType->get_parameters().push_back( new ObjectDecl( sizeofName( paramName ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
293	layoutFnType->get_parameters().push_back( new ObjectDecl( alignofName( paramName ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
294	}
295	}
296
297	/// Builds a layout function declaration
298	FunctionDecl buildLayoutFunctionDecl( AggregateDecl typeDecl, unsigned int functionNesting, FunctionType *layoutFnType ) {
299	// Routines at global scope marked "static" to prevent multiple definitions is separate translation units
300	// because each unit generates copies of the default routines for each aggregate.
301	FunctionDecl *layoutDecl = new FunctionDecl(
302	layoutofName( typeDecl ), functionNesting > 0 ? DeclarationNode::NoStorageClass : DeclarationNode::Static, LinkageSpec::AutoGen, layoutFnType, new CompoundStmt( noLabels ), true, false );
303	layoutDecl->fixUniqueId();
304	return layoutDecl;
305	}
306
307	/// Makes a unary operation
308	Expression makeOp( const std::string &name, Expression arg ) {
309	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
310	expr->get_args().push_back( arg );
311	return expr;
312	}
313
314	/// Makes a binary operation
315	Expression makeOp( const std::string &name, Expression lhs, Expression *rhs ) {
316	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
317	expr->get_args().push_back( lhs );
318	expr->get_args().push_back( rhs );
319	return expr;
320	}
321
322	/// Returns the dereference of a local pointer variable
323	Expression derefVar( ObjectDecl var ) {
324	return makeOp( "*?", new VariableExpr( var ) );
325	}
326
327	/// makes an if-statement with a single-expression if-block and no then block
328	Statement makeCond( Expression cond, Expression *ifPart ) {
329	return new IfStmt( noLabels, cond, new ExprStmt( noLabels, ifPart ), 0 );
330	}
331
332	/// makes a statement that assigns rhs to lhs if lhs < rhs
333	Statement makeAssignMax( Expression lhs, Expression *rhs ) {
334	return makeCond( makeOp( "?<?", lhs, rhs ), makeOp( "?=?", lhs->clone(), rhs->clone() ) );
335	}
336
337	/// makes a statement that aligns lhs to rhs (rhs should be an integer power of two)
338	Statement makeAlignTo( Expression lhs, Expression *rhs ) {
339	// check that the lhs is zeroed out to the level of rhs
340	Expression *ifCond = makeOp( "?&?", lhs, makeOp( "?-?", rhs, new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), "1" ) ) ) );
341	// if not aligned, increment to alignment
342	Expression *ifExpr = makeOp( "?+=?", lhs->clone(), makeOp( "?-?", rhs->clone(), ifCond->clone() ) );
343	return makeCond( ifCond, ifExpr );
344	}
345
346	/// adds an expression to a compound statement
347	void addExpr( CompoundStmt stmts, Expression expr ) {
348	stmts->get_kids().push_back( new ExprStmt( noLabels, expr ) );
349	}
350
351	/// adds a statement to a compound statement
352	void addStmt( CompoundStmt stmts, Statement stmt ) {
353	stmts->get_kids().push_back( stmt );
354	}
355
356	Declaration LayoutFunctionBuilder::mutate( StructDecl structDecl ) {
357	// do not generate layout function for "empty" tag structs
358	if ( structDecl->get_members().empty() ) return structDecl;
359
360	// get parameters that can change layout, exiting early if none
361	std::list< TypeDecl* > otypeParams = takeOtypeOnly( structDecl->get_parameters() );
362	if ( otypeParams.empty() ) return structDecl;
363
364	// build layout function signature
365	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
366	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
367	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
368
369	ObjectDecl *sizeParam = new ObjectDecl( sizeofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
370	layoutFnType->get_parameters().push_back( sizeParam );
371	ObjectDecl *alignParam = new ObjectDecl( alignofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
372	layoutFnType->get_parameters().push_back( alignParam );
373	ObjectDecl *offsetParam = new ObjectDecl( offsetofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
374	layoutFnType->get_parameters().push_back( offsetParam );
375	addOtypeParams( layoutFnType, otypeParams );
376
377	// build function decl
378	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( structDecl, functionNesting, layoutFnType );
379
380	// calculate struct layout in function body
381
382	// initialize size and alignment to 0 and 1 (will have at least one member to re-edit size
383	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "0" ) ) ) );
384	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
385	unsigned long n_members = 0;
386	bool firstMember = true;
387	for ( std::list< Declaration* >::const_iterator member = structDecl->get_members().begin(); member != structDecl->get_members().end(); ++member ) {
388	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
389	assert( dwt );
390	Type *memberType = dwt->get_type();
391
392	if ( firstMember ) {
393	firstMember = false;
394	} else {
395	// make sure all members after the first (automatically aligned at 0) are properly padded for alignment
396	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), new AlignofExpr( memberType->clone() ) ) );
397	}
398
399	// place current size in the current offset index
400	addExpr( layoutDecl->get_statements(), makeOp( "?=?", makeOp( "?[?]", new VariableExpr( offsetParam ), new ConstantExpr( Constant::from_ulong( n_members ) ) ),
401	derefVar( sizeParam ) ) );
402	++n_members;
403
404	// add member size to current size
405	addExpr( layoutDecl->get_statements(), makeOp( "?+=?", derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
406
407	// take max of member alignment and global alignment
408	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
409	}
410	// make sure the type is end-padded to a multiple of its alignment
411	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
412
413	addDeclarationAfter( layoutDecl );
414	return structDecl;
415	}
416
417	Declaration LayoutFunctionBuilder::mutate( UnionDecl unionDecl ) {
418	// do not generate layout function for "empty" tag unions
419	if ( unionDecl->get_members().empty() ) return unionDecl;
420
421	// get parameters that can change layout, exiting early if none
422	std::list< TypeDecl* > otypeParams = takeOtypeOnly( unionDecl->get_parameters() );
423	if ( otypeParams.empty() ) return unionDecl;
424
425	// build layout function signature
426	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
427	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
428	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
429
430	ObjectDecl *sizeParam = new ObjectDecl( sizeofName( unionDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
431	layoutFnType->get_parameters().push_back( sizeParam );
432	ObjectDecl *alignParam = new ObjectDecl( alignofName( unionDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
433	layoutFnType->get_parameters().push_back( alignParam );
434	addOtypeParams( layoutFnType, otypeParams );
435
436	// build function decl
437	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( unionDecl, functionNesting, layoutFnType );
438
439	// calculate union layout in function body
440	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
441	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
442	for ( std::list< Declaration* >::const_iterator member = unionDecl->get_members().begin(); member != unionDecl->get_members().end(); ++member ) {
443	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
444	assert( dwt );
445	Type *memberType = dwt->get_type();
446
447	// take max member size and global size
448	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
449
450	// take max of member alignment and global alignment
451	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
452	}
453	// make sure the type is end-padded to a multiple of its alignment
454	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
455
456	addDeclarationAfter( layoutDecl );
457	return unionDecl;
458	}
459
460	////////////////////////////////////////// Pass1 ////////////////////////////////////////////////////
461
462	namespace {
463	std::string makePolyMonoSuffix( FunctionType * function, const TyVarMap &tyVars ) {
464	std::stringstream name;
465
466	// NOTE: this function previously used isPolyObj, which failed to produce
467	// the correct thing in some situations. It's not clear to me why this wasn't working.
468
469	// if the return type or a parameter type involved polymorphic types, then the adapter will need
470	// to take those polymorphic types as pointers. Therefore, there can be two different functions
471	// with the same mangled name, so we need to further mangle the names.
472	for ( std::list< DeclarationWithType *>::iterator retval = function->get_returnVals().begin(); retval != function->get_returnVals().end(); ++retval ) {
473	if ( isPolyType( (*retval)->get_type(), tyVars ) ) {
474	name << "P";
475	} else {
476	name << "M";
477	}
478	}
479	name << "_";
480	std::list< DeclarationWithType *> &paramList = function->get_parameters();
481	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
482	if ( isPolyType( (*arg)->get_type(), tyVars ) ) {
483	name << "P";
484	} else {
485	name << "M";
486	}
487	} // for
488	return name.str();
489	}
490
491	std::string mangleAdapterName( FunctionType * function, const TyVarMap &tyVars ) {
492	return SymTab::Mangler::mangle( function ) + makePolyMonoSuffix( function, tyVars );
493	}
494
495	std::string makeAdapterName( const std::string &mangleName ) {
496	return "_adapter" + mangleName;
497	}
498
499	Pass1::Pass1() : useRetval( false ), tempNamer( "_temp" ) {}
500
501	/// Returns T if the given declaration is a function with parameter (T*) for some TypeInstType T, NULL otherwise
502	TypeInstType isTypeInstPtrFn( DeclarationWithType decl ) {
503	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
504	if ( funType->get_parameters().size() == 1 ) {
505	if ( PointerType pointer = dynamic_cast< PointerType >( funType->get_parameters().front()->get_type() ) ) {
506	if ( TypeInstType refType = dynamic_cast< TypeInstType >( pointer->get_base() ) ) {
507	return refType;
508	} // if
509	} // if
510	} // if
511	} // if
512	return 0;
513	}
514
515	/// Returns T if the given declaration is a function with parameters (T*, T) for some TypeInstType T, NULL otherwise
516	TypeInstType isTypeInstPtrValFn( DeclarationWithType decl ) {
517	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
518	if ( funType->get_parameters().size() == 2 ) {
519	if ( PointerType pointer = dynamic_cast< PointerType >( funType->get_parameters().front()->get_type() ) ) {
520	if ( TypeInstType refType = dynamic_cast< TypeInstType >( pointer->get_base() ) ) {
521	if ( TypeInstType refType2 = dynamic_cast< TypeInstType >( funType->get_parameters().back()->get_type() ) ) {
522	if ( refType->get_name() == refType2->get_name() ) {
523	return refType;
524	} // if
525	} // if
526	} // if
527	} // if
528	} // if
529	} // if
530	return 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 isTypeInstAssignment( 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 isTypeInstCtor( DeclarationWithType decl ) {
540	return decl->get_name() == "?{}" ? isTypeInstPtrFn( decl ) : 0;
541	}
542
543	/// Returns T if the given declaration is (?{})(T , T) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
544	TypeInstType isTypeInstCopy( DeclarationWithType decl ) {
545	return decl->get_name() == "?{}" ? isTypeInstPtrValFn( decl ) : 0;
546	}
547
548	/// Returns T if the given declaration is (^?{})(T ) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
549	TypeInstType isTypeInstDtor( DeclarationWithType decl ) {
550	return decl->get_name() == "^?{}" ? isTypeInstPtrFn( decl ) : 0;
551	}
552
553	/// Returns T if the given declaration is a function with parameters (T*, T) for some type T, where neither parameter is cv-qualified,
554	/// NULL otherwise
555	Type isNoCvPtrFn( DeclarationWithType decl ) {
556	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
557	if ( funType->get_parameters().size() == 1 ) {
558	Type::Qualifiers defaultQualifiers;
559	Type *paramType = funType->get_parameters().front()->get_type();
560	if ( paramType->get_qualifiers() != defaultQualifiers ) return 0;
561
562	if ( PointerType pointerType = dynamic_cast< PointerType >( paramType ) ) {
563	Type *baseType = pointerType->get_base();
564	if ( baseType->get_qualifiers() == defaultQualifiers ) {
565	return baseType;
566	} // if
567	} // if
568	} // if
569	} // if
570	return 0;
571	}
572
573	/// Returns T if the given declaration is a function with parameters (T*, T) for some type T, where neither parameter is cv-qualified,
574	/// NULL otherwise
575	Type isNoCvPtrValFn( DeclarationWithType decl ) {
576	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
577	if ( funType->get_parameters().size() == 2 ) {
578	Type::Qualifiers defaultQualifiers;
579	Type *paramType1 = funType->get_parameters().front()->get_type();
580	if ( paramType1->get_qualifiers() != defaultQualifiers ) return 0;
581	Type *paramType2 = funType->get_parameters().back()->get_type();
582	if ( paramType2->get_qualifiers() != defaultQualifiers ) return 0;
583
584	if ( PointerType pointerType = dynamic_cast< PointerType >( paramType1 ) ) {
585	Type *baseType1 = pointerType->get_base();
586	if ( baseType1->get_qualifiers() != defaultQualifiers ) return 0;
587	SymTab::Indexer dummy;
588	if ( ResolvExpr::typesCompatible( baseType1, paramType2, dummy ) ) {
589	return baseType1;
590	} // if
591	} // if
592	} // if
593	} // if
594	return 0;
595	}
596
597	/// returns T if the given declaration is: (?=?)(T , T) for some type T (return not checked, but maybe should be), NULL otherwise
598	/// Only picks assignments where neither parameter is cv-qualified
599	Type isAssignment( DeclarationWithType decl ) {
600	return decl->get_name() == "?=?" ? isNoCvPtrValFn( decl ) : 0;
601	}
602
603	/// returns T if the given declaration is: (?{})(T ) for some type T, NULL otherwise
604	/// Only picks ctors where the parameter is not cv-qualified
605	Type isCtor( DeclarationWithType decl ) {
606	return decl->get_name() == "?{}" ? isNoCvPtrFn( decl ) : 0;
607	}
608
609	/// returns T if the given declaration is: (?{})(T , T) for some type T (return not checked, but maybe should be), NULL otherwise
610	/// Only picks copy constructors where neither parameter is cv-qualified
611	Type isCopy( DeclarationWithType decl ) {
612	return decl->get_name() == "?{}" ? isNoCvPtrValFn( decl ) : 0;
613	}
614
615	/// returns T if the given declaration is: (?{})(T ) for some type T, NULL otherwise
616	/// Only picks ctors where the parameter is not cv-qualified
617	Type isDtor( DeclarationWithType decl ) {
618	return decl->get_name() == "^?{}" ? isNoCvPtrFn( decl ) : 0;
619	}
620
621	void Pass1::findTypeOps( const std::list< TypeDecl *> &forall ) {
622	// what if a nested function uses an assignment operator?
623	// assignOps.clear();
624	for ( std::list< TypeDecl *>::const_iterator i = forall.begin(); i != forall.end(); ++i ) {
625	for ( std::list< DeclarationWithType >::const_iterator assert = (i)->get_assertions().begin(); assert != (*i)->get_assertions().end(); ++assert ) {
626	std::string typeName;
627	if ( TypeInstType typeInst = isTypeInstAssignment( assert ) ) {
628	assignOps[ typeInst->get_name() ] = *assert;
629	} else if ( TypeInstType typeInst = isTypeInstCtor( assert ) ) {
630	ctorOps[ typeInst->get_name() ] = *assert;
631	} else if ( TypeInstType typeInst = isTypeInstCopy( assert ) ) {
632	copyOps[ typeInst->get_name() ] = *assert;
633	} else if ( TypeInstType typeInst = isTypeInstDtor( assert ) ) {
634	dtorOps[ typeInst->get_name() ] = *assert;
635	} // if
636	} // for
637	} // for
638	}
639
640	DeclarationWithType Pass1::mutate( FunctionDecl functionDecl ) {
641	// if this is a assignment function, put it in the map for this scope
642	if ( Type *paramType = isAssignment( functionDecl ) ) {
643	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
644	scopedAssignOps.insert( paramType, functionDecl );
645	}
646	} else if ( Type *paramType = isCtor( functionDecl ) ) {
647	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
648	scopedCtorOps.insert( paramType, functionDecl );
649	}
650	} else if ( Type *paramType = isCopy( functionDecl ) ) {
651	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
652	scopedCopyOps.insert( paramType, functionDecl );
653	}
654	} else if ( Type *paramType = isDtor( functionDecl ) ) {
655	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
656	scopedDtorOps.insert( paramType, functionDecl );
657	}
658	}
659
660	if ( functionDecl->get_statements() ) { // empty routine body ?
661	doBeginScope();
662	scopeTyVars.beginScope();
663	assignOps.beginScope();
664	ctorOps.beginScope();
665	copyOps.beginScope();
666	dtorOps.beginScope();
667
668	DeclarationWithType *oldRetval = retval;
669	bool oldUseRetval = useRetval;
670
671	// process polymorphic return value
672	retval = 0;
673	if ( isDynRet( functionDecl->get_functionType() ) && functionDecl->get_linkage() == LinkageSpec::Cforall ) {
674	retval = functionDecl->get_functionType()->get_returnVals().front();
675
676	// give names to unnamed return values
677	if ( retval->get_name() == "" ) {
678	retval->set_name( "_retparm" );
679	retval->set_linkage( LinkageSpec::C );
680	} // if
681	} // if
682
683	FunctionType *functionType = functionDecl->get_functionType();
684	makeTyVarMap( functionDecl->get_functionType(), scopeTyVars );
685	findTypeOps( functionDecl->get_functionType()->get_forall() );
686
687	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
688	std::list< FunctionType *> functions;
689	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
690	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
691	findFunction( (*assert)->get_type(), functions, scopeTyVars, needsAdapter );
692	} // for
693	} // for
694	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
695	findFunction( (*arg)->get_type(), functions, scopeTyVars, needsAdapter );
696	} // for
697
698	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
699	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
700	if ( adapters.find( mangleName ) == adapters.end() ) {
701	std::string adapterName = makeAdapterName( mangleName );
702	adapters.insert( std::pair< std::string, DeclarationWithType >( mangleName, new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( funType, scopeTyVars ) ), 0 ) ) );
703	} // if
704	} // for
705
706	functionDecl->set_statements( functionDecl->get_statements()->acceptMutator( *this ) );
707
708	scopeTyVars.endScope();
709	assignOps.endScope();
710	ctorOps.endScope();
711	copyOps.endScope();
712	dtorOps.endScope();
713	retval = oldRetval;
714	useRetval = oldUseRetval;
715	doEndScope();
716	} // if
717	return functionDecl;
718	}
719
720	TypeDecl Pass1::mutate( TypeDecl typeDecl ) {
721	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
722	return Mutator::mutate( typeDecl );
723	}
724
725	Expression Pass1::mutate( CommaExpr commaExpr ) {
726	bool oldUseRetval = useRetval;
727	useRetval = false;
728	commaExpr->set_arg1( maybeMutate( commaExpr->get_arg1(), *this ) );
729	useRetval = oldUseRetval;
730	commaExpr->set_arg2( maybeMutate( commaExpr->get_arg2(), *this ) );
731	return commaExpr;
732	}
733
734	Expression Pass1::mutate( ConditionalExpr condExpr ) {
735	bool oldUseRetval = useRetval;
736	useRetval = false;
737	condExpr->set_arg1( maybeMutate( condExpr->get_arg1(), *this ) );
738	useRetval = oldUseRetval;
739	condExpr->set_arg2( maybeMutate( condExpr->get_arg2(), *this ) );
740	condExpr->set_arg3( maybeMutate( condExpr->get_arg3(), *this ) );
741	return condExpr;
742
743	}
744
745	void Pass1::passArgTypeVars( ApplicationExpr appExpr, Type parmType, Type argBaseType, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars, std::set< std::string > &seenTypes ) {
746	Type *polyType = isPolyType( parmType, exprTyVars );
747	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
748	std::string typeName = mangleType( polyType );
749	if ( seenTypes.count( typeName ) ) return;
750
751	arg = appExpr->get_args().insert( arg, new SizeofExpr( argBaseType->clone() ) );
752	arg++;
753	arg = appExpr->get_args().insert( arg, new AlignofExpr( argBaseType->clone() ) );
754	arg++;
755	if ( dynamic_cast< StructInstType* >( polyType ) ) {
756	if ( StructInstType argBaseStructType = dynamic_cast< StructInstType >( argBaseType ) ) {
757	// zero-length arrays are forbidden by C, so don't pass offset for empty struct
758	if ( ! argBaseStructType->get_baseStruct()->get_members().empty() ) {
759	arg = appExpr->get_args().insert( arg, new OffsetPackExpr( argBaseStructType->clone() ) );
760	arg++;
761	}
762	} else {
763	throw SemanticError( "Cannot pass non-struct type for generic struct" );
764	}
765	}
766
767	seenTypes.insert( typeName );
768	}
769	}
770
771	void Pass1::passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
772	// pass size/align for type variables
773	for ( TyVarMap::const_iterator tyParm = exprTyVars.begin(); tyParm != exprTyVars.end(); ++tyParm ) {
774	ResolvExpr::EqvClass eqvClass;
775	assert( env );
776	if ( tyParm->second == TypeDecl::Any ) {
777	Type *concrete = env->lookup( tyParm->first );
778	if ( concrete ) {
779	arg = appExpr->get_args().insert( arg, new SizeofExpr( concrete->clone() ) );
780	arg++;
781	arg = appExpr->get_args().insert( arg, new AlignofExpr( concrete->clone() ) );
782	arg++;
783	} else {
784	// xxx - should this be an assertion?
785	throw SemanticError( "unbound type variable: " + tyParm->first + " in application ", appExpr );
786	} // if
787	} // if
788	} // for
789
790	// add size/align for generic types to parameter list
791	if ( appExpr->get_function()->get_results().empty() ) return;
792	FunctionType *funcType = getFunctionType( appExpr->get_function()->get_results().front() );
793	assert( funcType );
794
795	std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin();
796	std::list< Expression* >::const_iterator fnArg = arg;
797	std::set< std::string > seenTypes; ///< names for generic types we've seen
798
799	// a polymorphic return type may need to be added to the argument list
800	if ( polyRetType ) {
801	Type *concRetType = replaceWithConcrete( appExpr, polyRetType );
802	passArgTypeVars( appExpr, polyRetType, concRetType, arg, exprTyVars, seenTypes );
803	}
804
805	// add type information args for presently unseen types in parameter list
806	for ( ; fnParm != funcType->get_parameters().end() && fnArg != appExpr->get_args().end(); ++fnParm, ++fnArg ) {
807	VariableExpr fnArgBase = getBaseVar( fnArg );
808	if ( ! fnArgBase \|\| fnArgBase->get_results().empty() ) continue;
809	passArgTypeVars( appExpr, (*fnParm)->get_type(), fnArgBase->get_results().front(), arg, exprTyVars, seenTypes );
810	}
811	}
812
813	ObjectDecl Pass1::makeTemporary( Type type ) {
814	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, 0 );
815	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
816	return newObj;
817	}
818
819	Expression Pass1::addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg ) {
820	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
821	// if ( useRetval ) {
822	// assert( retval );
823	// arg = appExpr->get_args().insert( arg, new VariableExpr( retval ) );
824	// arg++;
825	// } else {
826
827	// Create temporary to hold return value of polymorphic function and produce that temporary as a result
828	// using a comma expression. Possibly change comma expression into statement expression "{}" for multiple
829	// return values.
830	ObjectDecl *newObj = makeTemporary( retType->clone() );
831	Expression *paramExpr = new VariableExpr( newObj );
832
833	// If the type of the temporary is not polymorphic, box temporary by taking its address;
834	// otherwise the temporary is already boxed and can be used directly.
835	if ( ! isPolyType( newObj->get_type(), scopeTyVars, env ) ) {
836	paramExpr = new AddressExpr( paramExpr );
837	} // if
838	arg = appExpr->get_args().insert( arg, paramExpr ); // add argument to function call
839	arg++;
840	// Build a comma expression to call the function and emulate a normal return.
841	CommaExpr *commaExpr = new CommaExpr( appExpr, new VariableExpr( newObj ) );
842	commaExpr->set_env( appExpr->get_env() );
843	appExpr->set_env( 0 );
844	return commaExpr;
845	// } // if
846	// return appExpr;
847	}
848
849	void Pass1::replaceParametersWithConcrete( ApplicationExpr appExpr, std::list< Expression >& params ) {
850	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
851	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
852	assert(paramType && "Aggregate parameters should be type expressions");
853	paramType->set_type( replaceWithConcrete( appExpr, paramType->get_type(), false ) );
854	}
855	}
856
857	Type Pass1::replaceWithConcrete( ApplicationExpr appExpr, Type *type, bool doClone ) {
858	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
859	Type *concrete = env->lookup( typeInst->get_name() );
860	if ( concrete == 0 ) {
861	throw SemanticError( "Unbound type variable " + typeInst->get_name() + " in ", appExpr );
862	} // if
863	return concrete;
864	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
865	if ( doClone ) {
866	structType = structType->clone();
867	}
868	replaceParametersWithConcrete( appExpr, structType->get_parameters() );
869	return structType;
870	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
871	if ( doClone ) {
872	unionType = unionType->clone();
873	}
874	replaceParametersWithConcrete( appExpr, unionType->get_parameters() );
875	return unionType;
876	}
877	return type;
878	}
879
880	Expression Pass1::addDynRetParam( ApplicationExpr appExpr, FunctionType function, ReferenceToType dynType, std::list< Expression *>::iterator &arg ) {
881	assert( env );
882	Type *concrete = replaceWithConcrete( appExpr, dynType );
883	// add out-parameter for return value
884	return addRetParam( appExpr, function, concrete, arg );
885	}
886
887	Expression Pass1::applyAdapter( ApplicationExpr appExpr, FunctionType function, std::list< Expression >::iterator &arg, const TyVarMap &tyVars ) {
888	Expression *ret = appExpr;
889	// if ( ! function->get_returnVals().empty() && isPolyType( function->get_returnVals().front()->get_type(), tyVars ) ) {
890	if ( isDynRet( function, tyVars ) ) {
891	ret = addRetParam( appExpr, function, function->get_returnVals().front()->get_type(), arg );
892	} // if
893	std::string mangleName = mangleAdapterName( function, tyVars );
894	std::string adapterName = makeAdapterName( mangleName );
895
896	// cast adaptee to void (*)(), since it may have any type inside a polymorphic function
897	Type * adapteeType = new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) );
898	appExpr->get_args().push_front( new CastExpr( appExpr->get_function(), adapteeType ) );
899	appExpr->set_function( new NameExpr( adapterName ) );
900
901	return ret;
902	}
903
904	void Pass1::boxParam( Type param, Expression &arg, const TyVarMap &exprTyVars ) {
905	assert( ! arg->get_results().empty() );
906	if ( isPolyType( param, exprTyVars ) ) {
907	if ( isPolyType( arg->get_results().front() ) ) {
908	// if the argument's type is polymorphic, we don't need to box again!
909	return;
910	} else if ( arg->get_results().front()->get_isLvalue() ) {
911	// VariableExpr and MemberExpr are lvalues; need to check this isn't coming from the second arg of a comma expression though (not an lvalue)
912	// xxx - need to test that this code is still reachable
913	if ( CommaExpr commaArg = dynamic_cast< CommaExpr >( arg ) ) {
914	commaArg->set_arg2( new AddressExpr( commaArg->get_arg2() ) );
915	} else {
916	arg = new AddressExpr( arg );
917	}
918	} else {
919	// use type computed in unification to declare boxed variables
920	Type * newType = param->clone();
921	if ( env ) env->apply( newType );
922	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, newType, 0 );
923	newObj->get_type()->get_qualifiers() = Type::Qualifiers(); // TODO: is this right???
924	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
925	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
926	assign->get_args().push_back( new VariableExpr( newObj ) );
927	assign->get_args().push_back( arg );
928	stmtsToAdd.push_back( new ExprStmt( noLabels, assign ) );
929	arg = new AddressExpr( new VariableExpr( newObj ) );
930	} // if
931	} // if
932	}
933
934	/// cast parameters to polymorphic functions so that types are replaced with
935	/// void * if they are type parameters in the formal type.
936	/// this gets rid of warnings from gcc.
937	void addCast( Expression &actual, Type formal, const TyVarMap &tyVars ) {
938	if ( getFunctionType( formal ) ) {
939	Type * newType = formal->clone();
940	newType = ScrubTyVars::scrub( newType, tyVars );
941	actual = new CastExpr( actual, newType );
942	} // if
943	}
944
945	void Pass1::boxParams( ApplicationExpr appExpr, FunctionType function, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
946	for ( std::list< DeclarationWithType *>::const_iterator param = function->get_parameters().begin(); param != function->get_parameters().end(); ++param, ++arg ) {
947	assert( arg != appExpr->get_args().end() );
948	addCast( arg, (param)->get_type(), exprTyVars );
949	boxParam( (param)->get_type(), arg, exprTyVars );
950	} // for
951	}
952
953	void Pass1::addInferredParams( ApplicationExpr appExpr, FunctionType functionType, std::list< Expression *>::iterator &arg, const TyVarMap &tyVars ) {
954	std::list< Expression *>::iterator cur = arg;
955	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
956	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
957	InferredParams::const_iterator inferParam = appExpr->get_inferParams().find( (*assert)->get_uniqueId() );
958	assert( inferParam != appExpr->get_inferParams().end() && "NOTE: Explicit casts of polymorphic functions to compatible monomorphic functions are currently unsupported" );
959	Expression *newExpr = inferParam->second.expr->clone();
960	addCast( newExpr, (*assert)->get_type(), tyVars );
961	boxParam( (*assert)->get_type(), newExpr, tyVars );
962	appExpr->get_args().insert( cur, newExpr );
963	} // for
964	} // for
965	}
966
967	void makeRetParm( FunctionType *funcType ) {
968	DeclarationWithType *retParm = funcType->get_returnVals().front();
969
970	// make a new parameter that is a pointer to the type of the old return value
971	retParm->set_type( new PointerType( Type::Qualifiers(), retParm->get_type() ) );
972	funcType->get_parameters().push_front( retParm );
973
974	// we don't need the return value any more
975	funcType->get_returnVals().clear();
976	}
977
978	FunctionType makeAdapterType( FunctionType adaptee, const TyVarMap &tyVars ) {
979	// actually make the adapter type
980	FunctionType *adapter = adaptee->clone();
981	// if ( ! adapter->get_returnVals().empty() && isPolyType( adapter->get_returnVals().front()->get_type(), tyVars ) ) {
982	if ( isDynRet( adapter, tyVars ) ) {
983	makeRetParm( adapter );
984	} // if
985	adapter->get_parameters().push_front( new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) ), 0 ) );
986	return adapter;
987	}
988
989	Expression makeAdapterArg( DeclarationWithType param, DeclarationWithType arg, DeclarationWithType realParam, const TyVarMap &tyVars ) {
990	assert( param );
991	assert( arg );
992	if ( isPolyType( realParam->get_type(), tyVars ) ) {
993	if ( ! isPolyType( arg->get_type() ) ) {
994	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
995	deref->get_args().push_back( new CastExpr( new VariableExpr( param ), new PointerType( Type::Qualifiers(), arg->get_type()->clone() ) ) );
996	deref->get_results().push_back( arg->get_type()->clone() );
997	return deref;
998	} // if
999	} // if
1000	return new VariableExpr( param );
1001	}
1002
1003	void addAdapterParams( ApplicationExpr adapteeApp, std::list< DeclarationWithType >::iterator arg, std::list< DeclarationWithType >::iterator param, std::list< DeclarationWithType >::iterator paramEnd, std::list< DeclarationWithType *>::iterator realParam, const TyVarMap &tyVars ) {
1004	UniqueName paramNamer( "_p" );
1005	for ( ; param != paramEnd; ++param, ++arg, ++realParam ) {
1006	if ( (*param)->get_name() == "" ) {
1007	(*param)->set_name( paramNamer.newName() );
1008	(*param)->set_linkage( LinkageSpec::C );
1009	} // if
1010	adapteeApp->get_args().push_back( makeAdapterArg( param, arg, *realParam, tyVars ) );
1011	} // for
1012	}
1013
1014	FunctionDecl Pass1::makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars ) {
1015	FunctionType *adapterType = makeAdapterType( adaptee, tyVars );
1016	adapterType = ScrubTyVars::scrub( adapterType, tyVars );
1017	DeclarationWithType *adapteeDecl = adapterType->get_parameters().front();
1018	adapteeDecl->set_name( "_adaptee" );
1019	ApplicationExpr *adapteeApp = new ApplicationExpr( new CastExpr( new VariableExpr( adapteeDecl ), new PointerType( Type::Qualifiers(), realType ) ) );
1020	Statement *bodyStmt;
1021
1022	std::list< TypeDecl *>::iterator tyArg = realType->get_forall().begin();
1023	std::list< TypeDecl *>::iterator tyParam = adapterType->get_forall().begin();
1024	std::list< TypeDecl *>::iterator realTyParam = adaptee->get_forall().begin();
1025	for ( ; tyParam != adapterType->get_forall().end(); ++tyArg, ++tyParam, ++realTyParam ) {
1026	assert( tyArg != realType->get_forall().end() );
1027	std::list< DeclarationWithType >::iterator assertArg = (tyArg)->get_assertions().begin();
1028	std::list< DeclarationWithType >::iterator assertParam = (tyParam)->get_assertions().begin();
1029	std::list< DeclarationWithType >::iterator realAssertParam = (realTyParam)->get_assertions().begin();
1030	for ( ; assertParam != (*tyParam)->get_assertions().end(); ++assertArg, ++assertParam, ++realAssertParam ) {
1031	assert( assertArg != (*tyArg)->get_assertions().end() );
1032	adapteeApp->get_args().push_back( makeAdapterArg( assertParam, assertArg, *realAssertParam, tyVars ) );
1033	} // for
1034	} // for
1035
1036	std::list< DeclarationWithType *>::iterator arg = realType->get_parameters().begin();
1037	std::list< DeclarationWithType *>::iterator param = adapterType->get_parameters().begin();
1038	std::list< DeclarationWithType *>::iterator realParam = adaptee->get_parameters().begin();
1039	param++; // skip adaptee parameter in the adapter type
1040	if ( realType->get_returnVals().empty() ) {
1041	// void return
1042	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1043	bodyStmt = new ExprStmt( noLabels, adapteeApp );
1044	// } else if ( isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
1045	} else if ( isDynType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
1046	// return type T
1047	if ( (*param)->get_name() == "" ) {
1048	(*param)->set_name( "_ret" );
1049	(*param)->set_linkage( LinkageSpec::C );
1050	} // if
1051	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
1052	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
1053	deref->get_args().push_back( new CastExpr( new VariableExpr( *param++ ), new PointerType( Type::Qualifiers(), realType->get_returnVals().front()->get_type()->clone() ) ) );
1054	assign->get_args().push_back( deref );
1055	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1056	assign->get_args().push_back( adapteeApp );
1057	bodyStmt = new ExprStmt( noLabels, assign );
1058	} else {
1059	// adapter for a function that returns a monomorphic value
1060	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1061	bodyStmt = new ReturnStmt( noLabels, adapteeApp );
1062	} // if
1063	CompoundStmt *adapterBody = new CompoundStmt( noLabels );
1064	adapterBody->get_kids().push_back( bodyStmt );
1065	std::string adapterName = makeAdapterName( mangleName );
1066	return new FunctionDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, adapterType, adapterBody, false, false );
1067	}
1068
1069	void Pass1::passAdapters( ApplicationExpr * appExpr, FunctionType * functionType, const TyVarMap & exprTyVars ) {
1070	// collect a list of function types passed as parameters or implicit parameters (assertions)
1071	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
1072	std::list< FunctionType *> functions;
1073	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
1074	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
1075	findFunction( (*assert)->get_type(), functions, exprTyVars, needsAdapter );
1076	} // for
1077	} // for
1078	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
1079	findFunction( (*arg)->get_type(), functions, exprTyVars, needsAdapter );
1080	} // for
1081
1082	// parameter function types for which an appropriate adapter has been generated. we cannot use the types
1083	// after applying substitutions, since two different parameter types may be unified to the same type
1084	std::set< std::string > adaptersDone;
1085
1086	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
1087	FunctionType originalFunction = (funType)->clone();
1088	FunctionType realFunction = (funType)->clone();
1089	std::string mangleName = SymTab::Mangler::mangle( realFunction );
1090
1091	// only attempt to create an adapter or pass one as a parameter if we haven't already done so for this
1092	// pre-substitution parameter function type.
1093	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
1094	adaptersDone.insert( adaptersDone.begin(), mangleName );
1095
1096	// apply substitution to type variables to figure out what the adapter's type should look like
1097	assert( env );
1098	env->apply( realFunction );
1099	mangleName = SymTab::Mangler::mangle( realFunction );
1100	mangleName += makePolyMonoSuffix( originalFunction, exprTyVars );
1101
1102	typedef ScopedMap< std::string, DeclarationWithType* >::iterator AdapterIter;
1103	AdapterIter adapter = adapters.find( mangleName );
1104	if ( adapter == adapters.end() ) {
1105	// adapter has not been created yet in the current scope, so define it
1106	FunctionDecl newAdapter = makeAdapter( funType, realFunction, mangleName, exprTyVars );
1107	std::pair< AdapterIter, bool > answer = adapters.insert( std::pair< std::string, DeclarationWithType *>( mangleName, newAdapter ) );
1108	adapter = answer.first;
1109	stmtsToAdd.push_back( new DeclStmt( noLabels, newAdapter ) );
1110	} // if
1111	assert( adapter != adapters.end() );
1112
1113	// add the appropriate adapter as a parameter
1114	appExpr->get_args().push_front( new VariableExpr( adapter->second ) );
1115	} // if
1116	} // for
1117	} // passAdapters
1118
1119	Expression makeIncrDecrExpr( ApplicationExpr appExpr, Type *polyType, bool isIncr ) {
1120	NameExpr *opExpr;
1121	if ( isIncr ) {
1122	opExpr = new NameExpr( "?+=?" );
1123	} else {
1124	opExpr = new NameExpr( "?-=?" );
1125	} // if
1126	UntypedExpr *addAssign = new UntypedExpr( opExpr );
1127	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
1128	addAssign->get_args().push_back( address->get_arg() );
1129	} else {
1130	addAssign->get_args().push_back( appExpr->get_args().front() );
1131	} // if
1132	addAssign->get_args().push_back( new NameExpr( sizeofName( mangleType( polyType ) ) ) );
1133	addAssign->get_results().front() = appExpr->get_results().front()->clone();
1134	if ( appExpr->get_env() ) {
1135	addAssign->set_env( appExpr->get_env() );
1136	appExpr->set_env( 0 );
1137	} // if
1138	appExpr->get_args().clear();
1139	delete appExpr;
1140	return addAssign;
1141	}
1142
1143	Expression Pass1::handleIntrinsics( ApplicationExpr appExpr ) {
1144	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( appExpr->get_function() ) ) {
1145	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic ) {
1146	if ( varExpr->get_var()->get_name() == "?[?]" ) {
1147	assert( ! appExpr->get_results().empty() );
1148	assert( appExpr->get_args().size() == 2 );
1149	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
1150	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
1151	assert( ! baseType1 \|\| ! baseType2 ); // the arguments cannot both be polymorphic pointers
1152	UntypedExpr *ret = 0;
1153	if ( baseType1 \|\| baseType2 ) { // one of the arguments is a polymorphic pointer
1154	ret = new UntypedExpr( new NameExpr( "?+?" ) );
1155	} // if
1156	if ( baseType1 ) {
1157	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1158	multiply->get_args().push_back( appExpr->get_args().back() );
1159	multiply->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1160	ret->get_args().push_back( appExpr->get_args().front() );
1161	ret->get_args().push_back( multiply );
1162	} else if ( baseType2 ) {
1163	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1164	multiply->get_args().push_back( appExpr->get_args().front() );
1165	multiply->get_args().push_back( new SizeofExpr( baseType2->clone() ) );
1166	ret->get_args().push_back( multiply );
1167	ret->get_args().push_back( appExpr->get_args().back() );
1168	} // if
1169	if ( baseType1 \|\| baseType2 ) {
1170	ret->get_results().push_front( appExpr->get_results().front()->clone() );
1171	if ( appExpr->get_env() ) {
1172	ret->set_env( appExpr->get_env() );
1173	appExpr->set_env( 0 );
1174	} // if
1175	appExpr->get_args().clear();
1176	delete appExpr;
1177	return ret;
1178	} // if
1179	} else if ( varExpr->get_var()->get_name() == "*?" ) {
1180	assert( ! appExpr->get_results().empty() );
1181	assert( ! appExpr->get_args().empty() );
1182	if ( isPolyType( appExpr->get_results().front(), scopeTyVars, env ) ) {
1183	Expression *ret = appExpr->get_args().front();
1184	delete ret->get_results().front();
1185	ret->get_results().front() = appExpr->get_results().front()->clone();
1186	if ( appExpr->get_env() ) {
1187	ret->set_env( appExpr->get_env() );
1188	appExpr->set_env( 0 );
1189	} // if
1190	appExpr->get_args().clear();
1191	delete appExpr;
1192	return ret;
1193	} // if
1194	} else if ( varExpr->get_var()->get_name() == "?++" \|\| varExpr->get_var()->get_name() == "?--" ) {
1195	assert( ! appExpr->get_results().empty() );
1196	assert( appExpr->get_args().size() == 1 );
1197	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
1198	Type *tempType = appExpr->get_results().front()->clone();
1199	if ( env ) {
1200	env->apply( tempType );
1201	} // if
1202	ObjectDecl *newObj = makeTemporary( tempType );
1203	VariableExpr *tempExpr = new VariableExpr( newObj );
1204	UntypedExpr *assignExpr = new UntypedExpr( new NameExpr( "?=?" ) );
1205	assignExpr->get_args().push_back( tempExpr->clone() );
1206	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
1207	assignExpr->get_args().push_back( address->get_arg()->clone() );
1208	} else {
1209	assignExpr->get_args().push_back( appExpr->get_args().front()->clone() );
1210	} // if
1211	CommaExpr *firstComma = new CommaExpr( assignExpr, makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "?++" ) );
1212	return new CommaExpr( firstComma, tempExpr );
1213	} // if
1214	} else if ( varExpr->get_var()->get_name() == "++?" \|\| varExpr->get_var()->get_name() == "--?" ) {
1215	assert( ! appExpr->get_results().empty() );
1216	assert( appExpr->get_args().size() == 1 );
1217	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
1218	return makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "++?" );
1219	} // if
1220	} else if ( varExpr->get_var()->get_name() == "?+?" \|\| varExpr->get_var()->get_name() == "?-?" ) {
1221	assert( ! appExpr->get_results().empty() );
1222	assert( appExpr->get_args().size() == 2 );
1223	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
1224	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
1225	if ( baseType1 && baseType2 ) {
1226	UntypedExpr *divide = new UntypedExpr( new NameExpr( "?/?" ) );
1227	divide->get_args().push_back( appExpr );
1228	divide->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1229	divide->get_results().push_front( appExpr->get_results().front()->clone() );
1230	if ( appExpr->get_env() ) {
1231	divide->set_env( appExpr->get_env() );
1232	appExpr->set_env( 0 );
1233	} // if
1234	return divide;
1235	} else if ( baseType1 ) {
1236	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1237	multiply->get_args().push_back( appExpr->get_args().back() );
1238	multiply->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1239	appExpr->get_args().back() = multiply;
1240	} else if ( baseType2 ) {
1241	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1242	multiply->get_args().push_back( appExpr->get_args().front() );
1243	multiply->get_args().push_back( new SizeofExpr( baseType2->clone() ) );
1244	appExpr->get_args().front() = multiply;
1245	} // if
1246	} else if ( varExpr->get_var()->get_name() == "?+=?" \|\| varExpr->get_var()->get_name() == "?-=?" ) {
1247	assert( ! appExpr->get_results().empty() );
1248	assert( appExpr->get_args().size() == 2 );
1249	Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env );
1250	if ( baseType ) {
1251	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1252	multiply->get_args().push_back( appExpr->get_args().back() );
1253	multiply->get_args().push_back( new SizeofExpr( baseType->clone() ) );
1254	appExpr->get_args().back() = multiply;
1255	} // if
1256	} // if
1257	return appExpr;
1258	} // if
1259	} // if
1260	return 0;
1261	}
1262
1263	Expression Pass1::mutate( ApplicationExpr appExpr ) {
1264	// std::cerr << "mutate appExpr: ";
1265	// for ( TyVarMap::iterator i = scopeTyVars.begin(); i != scopeTyVars.end(); ++i ) {
1266	// std::cerr << i->first << " ";
1267	// }
1268	// std::cerr << "\n";
1269	bool oldUseRetval = useRetval;
1270	useRetval = false;
1271	appExpr->get_function()->acceptMutator( *this );
1272	mutateAll( appExpr->get_args(), *this );
1273	useRetval = oldUseRetval;
1274
1275	assert( ! appExpr->get_function()->get_results().empty() );
1276	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
1277	assert( pointer );
1278	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
1279	assert( function );
1280
1281	if ( Expression *newExpr = handleIntrinsics( appExpr ) ) {
1282	return newExpr;
1283	} // if
1284
1285	Expression *ret = appExpr;
1286
1287	std::list< Expression *>::iterator arg = appExpr->get_args().begin();
1288	std::list< Expression *>::iterator paramBegin = appExpr->get_args().begin();
1289
1290	TyVarMap exprTyVars( (TypeDecl::Kind)-1 );
1291	makeTyVarMap( function, exprTyVars );
1292	ReferenceToType *dynRetType = isDynRet( function, exprTyVars );
1293
1294	if ( dynRetType ) {
1295	ret = addDynRetParam( appExpr, function, dynRetType, arg );
1296	} else if ( needsAdapter( function, scopeTyVars ) ) {
1297	// std::cerr << "needs adapter: ";
1298	// printTyVarMap( std::cerr, scopeTyVars );
1299	// std::cerr << *env << std::endl;
1300	// change the application so it calls the adapter rather than the passed function
1301	ret = applyAdapter( appExpr, function, arg, scopeTyVars );
1302	} // if
1303	arg = appExpr->get_args().begin();
1304
1305	passTypeVars( appExpr, dynRetType, arg, exprTyVars );
1306	addInferredParams( appExpr, function, arg, exprTyVars );
1307
1308	arg = paramBegin;
1309
1310	boxParams( appExpr, function, arg, exprTyVars );
1311	passAdapters( appExpr, function, exprTyVars );
1312
1313	return ret;
1314	}
1315
1316	Expression Pass1::mutate( UntypedExpr expr ) {
1317	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
1318	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
1319	if ( name->get_name() == "*?" ) {
1320	Expression *ret = expr->get_args().front();
1321	expr->get_args().clear();
1322	delete expr;
1323	return ret->acceptMutator( *this );
1324	} // if
1325	} // if
1326	} // if
1327	return PolyMutator::mutate( expr );
1328	}
1329
1330	Expression Pass1::mutate( AddressExpr addrExpr ) {
1331	assert( ! addrExpr->get_arg()->get_results().empty() );
1332
1333	bool needs = false;
1334	if ( UntypedExpr expr = dynamic_cast< UntypedExpr >( addrExpr->get_arg() ) ) {
1335	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
1336	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
1337	if ( name->get_name() == "*?" ) {
1338	if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr->get_args().front() ) ) {
1339	assert( ! appExpr->get_function()->get_results().empty() );
1340	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
1341	assert( pointer );
1342	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
1343	assert( function );
1344	needs = needsAdapter( function, scopeTyVars );
1345	} // if
1346	} // if
1347	} // if
1348	} // if
1349	} // if
1350	// isPolyType check needs to happen before mutating addrExpr arg, so pull it forward
1351	// out of the if condition.
1352	bool polytype = isPolyType( addrExpr->get_arg()->get_results().front(), scopeTyVars, env );
1353	addrExpr->set_arg( mutateExpression( addrExpr->get_arg() ) );
1354	if ( polytype \|\| needs ) {
1355	Expression *ret = addrExpr->get_arg();
1356	delete ret->get_results().front();
1357	ret->get_results().front() = addrExpr->get_results().front()->clone();
1358	addrExpr->set_arg( 0 );
1359	delete addrExpr;
1360	return ret;
1361	} else {
1362	return addrExpr;
1363	} // if
1364	}
1365
1366	/// Wraps a function declaration in a new pointer-to-function variable expression
1367	VariableExpr wrapFunctionDecl( DeclarationWithType functionDecl ) {
1368	// line below cloned from FixFunction.cc
1369	// xxx - functionObj is never added to a list of declarations...
1370	ObjectDecl *functionObj = new ObjectDecl( functionDecl->get_name(), functionDecl->get_storageClass(), functionDecl->get_linkage(), 0,
1371	new PointerType( Type::Qualifiers(), functionDecl->get_type()->clone() ), 0 );
1372	functionObj->set_mangleName( functionDecl->get_mangleName() );
1373	functionObj->set_scopeLevel( functionDecl->get_scopeLevel() );
1374	return new VariableExpr( functionObj );
1375	}
1376
1377	/// Finds the operation declaration for a given type in one of the two maps
1378	DeclarationWithType* findOpForType( Type formalType, const ScopedMap< std::string, DeclarationWithType >& ops, ResolvExpr::TypeMap< DeclarationWithType >& scopedOps ) {
1379	if ( TypeInstType formalTypeInstType = dynamic_cast< TypeInstType >( formalType ) ) {
1380	ScopedMap< std::string, DeclarationWithType *>::const_iterator opIt = ops.find( formalTypeInstType->get_name() );
1381	return opIt == ops.end() ? 0 : opIt->second;
1382	} else {
1383	return scopedOps.find( formalType );
1384	}
1385	}
1386
1387	/// Adds an assertion parameter to the application expression for the actual assertion declaration valued with the assert op
1388	void addAssertionFor( ApplicationExpr appExpr, DeclarationWithType actualDecl, DeclarationWithType *assertOp ) {
1389	appExpr->get_inferParams()[ actualDecl->get_uniqueId() ]
1390	= ParamEntry( assertOp->get_uniqueId(), assertOp->get_type()->clone(), actualDecl->get_type()->clone(), wrapFunctionDecl( assertOp ) );
1391	}
1392
1393	Statement * Pass1::mutate( ReturnStmt *returnStmt ) {
1394	if ( retval && returnStmt->get_expr() ) {
1395	assert( ! returnStmt->get_expr()->get_results().empty() );
1396	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
1397	// if ( returnStmt->get_expr()->get_results().front()->get_isLvalue() ) {
1398	// by this point, a cast expr on a polymorphic return value is redundant
1399	while ( CastExpr castExpr = dynamic_cast< CastExpr >( returnStmt->get_expr() ) ) {
1400	returnStmt->set_expr( castExpr->get_arg() );
1401	returnStmt->get_expr()->set_env( castExpr->get_env() );
1402	castExpr->set_env( 0 );
1403	castExpr->set_arg( 0 );
1404	delete castExpr;
1405	} //while
1406
1407	// find assignment operator for (polymorphic) return type
1408	ApplicationExpr *assignExpr = 0;
1409	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( retval->get_type() ) ) {
1410	// find assignment operator for type variable
1411	ScopedMap< std::string, DeclarationWithType *>::const_iterator assignIter = assignOps.find( typeInst->get_name() );
1412	if ( assignIter == assignOps.end() ) {
1413	throw SemanticError( "Attempt to return dtype or ftype object in ", returnStmt->get_expr() );
1414	} // if
1415	assignExpr = new ApplicationExpr( new VariableExpr( assignIter->second ) );
1416	} else if ( ReferenceToType refType = dynamic_cast< ReferenceToType >( retval->get_type() ) ) {
1417	// find assignment operator for generic type
1418	DeclarationWithType *functionDecl = scopedAssignOps.find( refType );
1419	if ( ! functionDecl ) {
1420	throw SemanticError( "Attempt to return dtype or ftype generic object in ", returnStmt->get_expr() );
1421	}
1422
1423	// wrap it up in an application expression
1424	assignExpr = new ApplicationExpr( wrapFunctionDecl( functionDecl ) );
1425	assignExpr->set_env( env->clone() );
1426
1427	// find each of its needed secondary assignment operators
1428	std::list< Expression* > &tyParams = refType->get_parameters();
1429	std::list< TypeDecl* > &forallParams = functionDecl->get_type()->get_forall();
1430	std::list< Expression* >::const_iterator tyIt = tyParams.begin();
1431	std::list< TypeDecl* >::const_iterator forallIt = forallParams.begin();
1432	for ( ; tyIt != tyParams.end() && forallIt != forallParams.end(); ++tyIt, ++forallIt ) {
1433	// Add appropriate mapping to assignment expression environment
1434	TypeExpr formalTypeExpr = dynamic_cast< TypeExpr >( *tyIt );
1435	assert( formalTypeExpr && "type parameters must be type expressions" );
1436	Type *formalType = formalTypeExpr->get_type();
1437	assignExpr->get_env()->add( (*forallIt)->get_name(), formalType );
1438
1439	// skip non-otype parameters (ftype/dtype)
1440	if ( (*forallIt)->get_kind() != TypeDecl::Any ) continue;
1441
1442	// find otype operators for formal type
1443	DeclarationWithType *assertAssign = findOpForType( formalType, assignOps, scopedAssignOps );
1444	if ( ! assertAssign ) throw SemanticError( "No assignment operation found for ", formalType );
1445
1446	DeclarationWithType *assertCtor = findOpForType( formalType, ctorOps, scopedCtorOps );
1447	if ( ! assertCtor ) throw SemanticError( "No default constructor found for ", formalType );
1448
1449	DeclarationWithType *assertCopy = findOpForType( formalType, copyOps, scopedCopyOps );
1450	if ( ! assertCopy ) throw SemanticError( "No copy constructor found for ", formalType );
1451
1452	DeclarationWithType *assertDtor = findOpForType( formalType, dtorOps, scopedDtorOps );
1453	if ( ! assertDtor ) throw SemanticError( "No destructor found for ", formalType );
1454
1455	// add inferred parameters for otype operators to assignment expression
1456	// NOTE: Code here assumes that first four assertions are assign op, ctor, copy ctor, dtor, in that order
1457	std::list< DeclarationWithType* > &asserts = (*forallIt)->get_assertions();
1458	assert( asserts.size() >= 4 && "Type param needs otype operator assertions" );
1459
1460	std::list< DeclarationWithType* >::iterator actualIt = asserts.begin();
1461	addAssertionFor( assignExpr, *actualIt, assertAssign );
1462	++actualIt;
1463	addAssertionFor( assignExpr, *actualIt, assertCtor );
1464	++actualIt;
1465	addAssertionFor( assignExpr, *actualIt, assertCopy );
1466	++actualIt;
1467	addAssertionFor( assignExpr, *actualIt, assertDtor );
1468
1469	}
1470	}
1471	assert( assignExpr );
1472
1473	// replace return statement with appropriate assignment to out parameter
1474	Expression *retParm = new NameExpr( retval->get_name() );
1475	retParm->get_results().push_back( new PointerType( Type::Qualifiers(), retval->get_type()->clone() ) );
1476	assignExpr->get_args().push_back( retParm );
1477	assignExpr->get_args().push_back( returnStmt->get_expr() );
1478	stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( assignExpr ) ) );
1479	// } else {
1480	// useRetval = true;
1481	// stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( returnStmt->get_expr() ) ) );
1482	// useRetval = false;
1483	// } // if
1484	returnStmt->set_expr( 0 );
1485	} else {
1486	returnStmt->set_expr( mutateExpression( returnStmt->get_expr() ) );
1487	} // if
1488	return returnStmt;
1489	}
1490
1491	Type * Pass1::mutate( PointerType *pointerType ) {
1492	scopeTyVars.beginScope();
1493	makeTyVarMap( pointerType, scopeTyVars );
1494
1495	Type *ret = Mutator::mutate( pointerType );
1496
1497	scopeTyVars.endScope();
1498	return ret;
1499	}
1500
1501	Type * Pass1::mutate( FunctionType *functionType ) {
1502	scopeTyVars.beginScope();
1503	makeTyVarMap( functionType, scopeTyVars );
1504
1505	Type *ret = Mutator::mutate( functionType );
1506
1507	scopeTyVars.endScope();
1508	return ret;
1509	}
1510
1511	void Pass1::doBeginScope() {
1512	adapters.beginScope();
1513	scopedAssignOps.beginScope();
1514	scopedCtorOps.beginScope();
1515	scopedCopyOps.beginScope();
1516	scopedDtorOps.beginScope();
1517	}
1518
1519	void Pass1::doEndScope() {
1520	adapters.endScope();
1521	scopedAssignOps.endScope();
1522	scopedCtorOps.endScope();
1523	scopedCopyOps.endScope();
1524	scopedDtorOps.endScope();
1525	}
1526
1527	////////////////////////////////////////// Pass2 ////////////////////////////////////////////////////
1528
1529	void Pass2::addAdapters( FunctionType *functionType ) {
1530	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
1531	std::list< FunctionType *> functions;
1532	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
1533	Type orig = (arg)->get_type();
1534	findAndReplaceFunction( orig, functions, scopeTyVars, needsAdapter );
1535	(*arg)->set_type( orig );
1536	}
1537	std::set< std::string > adaptersDone;
1538	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
1539	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
1540	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
1541	std::string adapterName = makeAdapterName( mangleName );
1542	paramList.push_front( new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( *funType, scopeTyVars ) ), 0 ) );
1543	adaptersDone.insert( adaptersDone.begin(), mangleName );
1544	}
1545	}
1546	// deleteAll( functions );
1547	}
1548
1549	template< typename DeclClass >
1550	DeclClass * Pass2::handleDecl( DeclClass decl, Type type ) {
1551	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
1552
1553	return ret;
1554	}
1555
1556	DeclarationWithType * Pass2::mutate( FunctionDecl *functionDecl ) {
1557	return handleDecl( functionDecl, functionDecl->get_functionType() );
1558	}
1559
1560	ObjectDecl * Pass2::mutate( ObjectDecl *objectDecl ) {
1561	return handleDecl( objectDecl, objectDecl->get_type() );
1562	}
1563
1564	TypeDecl * Pass2::mutate( TypeDecl *typeDecl ) {
1565	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1566	if ( typeDecl->get_base() ) {
1567	return handleDecl( typeDecl, typeDecl->get_base() );
1568	} else {
1569	return Mutator::mutate( typeDecl );
1570	}
1571	}
1572
1573	TypedefDecl * Pass2::mutate( TypedefDecl *typedefDecl ) {
1574	return handleDecl( typedefDecl, typedefDecl->get_base() );
1575	}
1576
1577	Type * Pass2::mutate( PointerType *pointerType ) {
1578	scopeTyVars.beginScope();
1579	makeTyVarMap( pointerType, scopeTyVars );
1580
1581	Type *ret = Mutator::mutate( pointerType );
1582
1583	scopeTyVars.endScope();
1584	return ret;
1585	}
1586
1587	Type Pass2::mutate( FunctionType funcType ) {
1588	scopeTyVars.beginScope();
1589	makeTyVarMap( funcType, scopeTyVars );
1590
1591	// move polymorphic return type to parameter list
1592	if ( isDynRet( funcType ) ) {
1593	DeclarationWithType *ret = funcType->get_returnVals().front();
1594	ret->set_type( new PointerType( Type::Qualifiers(), ret->get_type() ) );
1595	funcType->get_parameters().push_front( ret );
1596	funcType->get_returnVals().pop_front();
1597	}
1598
1599	// add size/align and assertions for type parameters to parameter list
1600	std::list< DeclarationWithType *>::iterator last = funcType->get_parameters().begin();
1601	std::list< DeclarationWithType *> inferredParams;
1602	ObjectDecl newObj( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), 0 );
1603	ObjectDecl newPtr( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0,
1604	new PointerType( Type::Qualifiers(), new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) ), 0 );
1605	for ( std::list< TypeDecl *>::const_iterator tyParm = funcType->get_forall().begin(); tyParm != funcType->get_forall().end(); ++tyParm ) {
1606	ObjectDecl sizeParm, alignParm;
1607	// add all size and alignment parameters to parameter list
1608	if ( (*tyParm)->get_kind() == TypeDecl::Any ) {
1609	TypeInstType parmType( Type::Qualifiers(), (tyParm)->get_name(), tyParm );
1610	std::string parmName = mangleType( &parmType );
1611
1612	sizeParm = newObj.clone();
1613	sizeParm->set_name( sizeofName( parmName ) );
1614	last = funcType->get_parameters().insert( last, sizeParm );
1615	++last;
1616
1617	alignParm = newObj.clone();
1618	alignParm->set_name( alignofName( parmName ) );
1619	last = funcType->get_parameters().insert( last, alignParm );
1620	++last;
1621	}
1622	// move all assertions into parameter list
1623	for ( std::list< DeclarationWithType >::iterator assert = (tyParm)->get_assertions().begin(); assert != (*tyParm)->get_assertions().end(); ++assert ) {
1624	// assert = (assert)->acceptMutator( *this );
1625	inferredParams.push_back( *assert );
1626	}
1627	(*tyParm)->get_assertions().clear();
1628	}
1629
1630	// add size/align for generic parameter types to parameter list
1631	std::set< std::string > seenTypes; // sizeofName for generic types we've seen
1632	for ( std::list< DeclarationWithType* >::const_iterator fnParm = last; fnParm != funcType->get_parameters().end(); ++fnParm ) {
1633	Type polyType = isPolyType( (fnParm)->get_type(), scopeTyVars );
1634	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
1635	std::string typeName = mangleType( polyType );
1636	if ( seenTypes.count( typeName ) ) continue;
1637
1638	ObjectDecl sizeParm, alignParm, *offsetParm;
1639	sizeParm = newObj.clone();
1640	sizeParm->set_name( sizeofName( typeName ) );
1641	last = funcType->get_parameters().insert( last, sizeParm );
1642	++last;
1643
1644	alignParm = newObj.clone();
1645	alignParm->set_name( alignofName( typeName ) );
1646	last = funcType->get_parameters().insert( last, alignParm );
1647	++last;
1648
1649	if ( StructInstType polyBaseStruct = dynamic_cast< StructInstType >( polyType ) ) {
1650	// NOTE zero-length arrays are illegal in C, so empty structs have no offset array
1651	if ( ! polyBaseStruct->get_baseStruct()->get_members().empty() ) {
1652	offsetParm = newPtr.clone();
1653	offsetParm->set_name( offsetofName( typeName ) );
1654	last = funcType->get_parameters().insert( last, offsetParm );
1655	++last;
1656	}
1657	}
1658
1659	seenTypes.insert( typeName );
1660	}
1661	}
1662
1663	// splice assertion parameters into parameter list
1664	funcType->get_parameters().splice( last, inferredParams );
1665	addAdapters( funcType );
1666	mutateAll( funcType->get_returnVals(), *this );
1667	mutateAll( funcType->get_parameters(), *this );
1668
1669	scopeTyVars.endScope();
1670	return funcType;
1671	}
1672
1673	////////////////////////////////////////// PolyGenericCalculator ////////////////////////////////////////////////////
1674
1675	void PolyGenericCalculator::beginTypeScope( Type *ty ) {
1676	scopeTyVars.beginScope();
1677	makeTyVarMap( ty, scopeTyVars );
1678	}
1679
1680	void PolyGenericCalculator::endTypeScope() {
1681	scopeTyVars.endScope();
1682	}
1683
1684	template< typename DeclClass >
1685	DeclClass * PolyGenericCalculator::handleDecl( DeclClass decl, Type type ) {
1686	beginTypeScope( type );
1687	// knownLayouts.beginScope();
1688	// knownOffsets.beginScope();
1689
1690	DeclClass ret = static_cast< DeclClass >( Parent::mutate( decl ) );
1691
1692	// knownOffsets.endScope();
1693	// knownLayouts.endScope();
1694	endTypeScope();
1695	return ret;
1696	}
1697
1698	ObjectDecl * PolyGenericCalculator::mutate( ObjectDecl *objectDecl ) {
1699	return handleDecl( objectDecl, objectDecl->get_type() );
1700	}
1701
1702	DeclarationWithType * PolyGenericCalculator::mutate( FunctionDecl *functionDecl ) {
1703	knownLayouts.beginScope();
1704	knownOffsets.beginScope();
1705
1706	DeclarationWithType * decl = handleDecl( functionDecl, functionDecl->get_functionType() );
1707	knownOffsets.endScope();
1708	knownLayouts.endScope();
1709	return decl;
1710	}
1711
1712	TypedefDecl * PolyGenericCalculator::mutate( TypedefDecl *typedefDecl ) {
1713	return handleDecl( typedefDecl, typedefDecl->get_base() );
1714	}
1715
1716	TypeDecl * PolyGenericCalculator::mutate( TypeDecl *typeDecl ) {
1717	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1718	return Parent::mutate( typeDecl );
1719	}
1720
1721	Type * PolyGenericCalculator::mutate( PointerType *pointerType ) {
1722	beginTypeScope( pointerType );
1723
1724	Type *ret = Parent::mutate( pointerType );
1725
1726	endTypeScope();
1727	return ret;
1728	}
1729
1730	Type * PolyGenericCalculator::mutate( FunctionType *funcType ) {
1731	beginTypeScope( funcType );
1732
1733	// make sure that any type information passed into the function is accounted for
1734	for ( std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin(); fnParm != funcType->get_parameters().end(); ++fnParm ) {
1735	// condition here duplicates that in Pass2::mutate( FunctionType* )
1736	Type polyType = isPolyType( (fnParm)->get_type(), scopeTyVars );
1737	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
1738	knownLayouts.insert( mangleType( polyType ) );
1739	}
1740	}
1741
1742	Type *ret = Parent::mutate( funcType );
1743
1744	endTypeScope();
1745	return ret;
1746	}
1747
1748	Statement PolyGenericCalculator::mutate( DeclStmt declStmt ) {
1749	if ( ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( declStmt->get_decl() ) ) {
1750	if ( findGeneric( objectDecl->get_type() ) ) {
1751	// change initialization of a polymorphic value object
1752	// to allocate storage with alloca
1753	Type *declType = objectDecl->get_type();
1754	UntypedExpr *alloc = new UntypedExpr( new NameExpr( "__builtin_alloca" ) );
1755	alloc->get_args().push_back( new NameExpr( sizeofName( mangleType( declType ) ) ) );
1756
1757	delete objectDecl->get_init();
1758
1759	std::list<Expression*> designators;
1760	objectDecl->set_init( new SingleInit( alloc, designators, false ) ); // not constructed
1761	}
1762	}
1763	return Parent::mutate( declStmt );
1764	}
1765
1766	/// Finds the member in the base list that matches the given declaration; returns its index, or -1 if not present
1767	long findMember( DeclarationWithType memberDecl, std::list< Declaration > &baseDecls ) {
1768	long i = 0;
1769	for(std::list< Declaration* >::const_iterator decl = baseDecls.begin(); decl != baseDecls.end(); ++decl, ++i ) {
1770	if ( memberDecl->get_name() != (*decl)->get_name() ) continue;
1771
1772	if ( DeclarationWithType declWithType = dynamic_cast< DeclarationWithType >( *decl ) ) {
1773	if ( memberDecl->get_mangleName().empty() \|\| declWithType->get_mangleName().empty()
1774	\|\| memberDecl->get_mangleName() == declWithType->get_mangleName() ) return i;
1775	else continue;
1776	} else return i;
1777	}
1778	return -1;
1779	}
1780
1781	/// Returns an index expression into the offset array for a type
1782	Expression makeOffsetIndex( Type objectType, long i ) {
1783	std::stringstream offset_namer;
1784	offset_namer << i;
1785	ConstantExpr *fieldIndex = new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), offset_namer.str() ) );
1786	UntypedExpr *fieldOffset = new UntypedExpr( new NameExpr( "?[?]" ) );
1787	fieldOffset->get_args().push_back( new NameExpr( offsetofName( mangleType( objectType ) ) ) );
1788	fieldOffset->get_args().push_back( fieldIndex );
1789	return fieldOffset;
1790	}
1791
1792	/// Returns an expression dereferenced n times
1793	Expression makeDerefdVar( Expression derefdVar, long n ) {
1794	for ( int i = 1; i < n; ++i ) {
1795	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
1796	derefExpr->get_args().push_back( derefdVar );
1797	// xxx - should set results on derefExpr
1798	derefdVar = derefExpr;
1799	}
1800	return derefdVar;
1801	}
1802
1803	Expression PolyGenericCalculator::mutate( MemberExpr memberExpr ) {
1804	// mutate, exiting early if no longer MemberExpr
1805	Expression *expr = Parent::mutate( memberExpr );
1806	memberExpr = dynamic_cast< MemberExpr* >( expr );
1807	if ( ! memberExpr ) return expr;
1808
1809	// get declaration for base struct, exiting early if not found
1810	int varDepth;
1811	VariableExpr *varExpr = getBaseVar( memberExpr->get_aggregate(), &varDepth );
1812	if ( ! varExpr ) return memberExpr;
1813	ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( varExpr->get_var() );
1814	if ( ! objectDecl ) return memberExpr;
1815
1816	// only mutate member expressions for polymorphic types
1817	int tyDepth;
1818	Type *objectType = hasPolyBase( objectDecl->get_type(), scopeTyVars, &tyDepth );
1819	if ( ! objectType ) return memberExpr;
1820	findGeneric( objectType ); // ensure layout for this type is available
1821
1822	// replace member expression with dynamically-computed layout expression
1823	Expression *newMemberExpr = 0;
1824	if ( StructInstType structType = dynamic_cast< StructInstType >( objectType ) ) {
1825	// look up offset index
1826	long i = findMember( memberExpr->get_member(), structType->get_baseStruct()->get_members() );
1827	if ( i == -1 ) return memberExpr;
1828
1829	// replace member expression with pointer to base plus offset
1830	UntypedExpr *fieldLoc = new UntypedExpr( new NameExpr( "?+?" ) );
1831	fieldLoc->get_args().push_back( makeDerefdVar( varExpr->clone(), varDepth ) );
1832	fieldLoc->get_args().push_back( makeOffsetIndex( objectType, i ) );
1833	newMemberExpr = fieldLoc;
1834	} else if ( dynamic_cast< UnionInstType* >( objectType ) ) {
1835	// union members are all at offset zero, so build appropriately-dereferenced variable
1836	newMemberExpr = makeDerefdVar( varExpr->clone(), varDepth );
1837	} else return memberExpr;
1838	assert( newMemberExpr );
1839
1840	Type *memberType = memberExpr->get_member()->get_type();
1841	if ( ! isPolyType( memberType, scopeTyVars ) ) {
1842	// 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
1843	CastExpr *ptrCastExpr = new CastExpr( newMemberExpr, new PointerType( Type::Qualifiers(), memberType->clone() ) );
1844	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
1845	derefExpr->get_args().push_back( ptrCastExpr );
1846	newMemberExpr = derefExpr;
1847	}
1848
1849	delete memberExpr;
1850	return newMemberExpr;
1851	}
1852
1853	ObjectDecl PolyGenericCalculator::makeVar( const std::string &name, Type type, Initializer *init ) {
1854	ObjectDecl *newObj = new ObjectDecl( name, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, init );
1855	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
1856	return newObj;
1857	}
1858
1859	void PolyGenericCalculator::addOtypeParamsToLayoutCall( UntypedExpr layoutCall, const std::list< Type > &otypeParams ) {
1860	for ( std::list< Type* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
1861	if ( findGeneric( *param ) ) {
1862	// push size/align vars for a generic parameter back
1863	std::string paramName = mangleType( *param );
1864	layoutCall->get_args().push_back( new NameExpr( sizeofName( paramName ) ) );
1865	layoutCall->get_args().push_back( new NameExpr( alignofName( paramName ) ) );
1866	} else {
1867	layoutCall->get_args().push_back( new SizeofExpr( (*param)->clone() ) );
1868	layoutCall->get_args().push_back( new AlignofExpr( (*param)->clone() ) );
1869	}
1870	}
1871	}
1872
1873	/// returns true if any of the otype parameters have a dynamic layout and puts all otype parameters in the output list
1874	bool findGenericParams( std::list< TypeDecl* > &baseParams, std::list< Expression* > &typeParams, std::list< Type* > &out ) {
1875	bool hasDynamicLayout = false;
1876
1877	std::list< TypeDecl* >::const_iterator baseParam = baseParams.begin();
1878	std::list< Expression* >::const_iterator typeParam = typeParams.begin();
1879	for ( ; baseParam != baseParams.end() && typeParam != typeParams.end(); ++baseParam, ++typeParam ) {
1880	// skip non-otype parameters
1881	if ( (*baseParam)->get_kind() != TypeDecl::Any ) continue;
1882	TypeExpr typeExpr = dynamic_cast< TypeExpr >( *typeParam );
1883	assert( typeExpr && "all otype parameters should be type expressions" );
1884
1885	Type *type = typeExpr->get_type();
1886	out.push_back( type );
1887	if ( isPolyType( type ) ) hasDynamicLayout = true;
1888	}
1889	assert( baseParam == baseParams.end() && typeParam == typeParams.end() );
1890
1891	return hasDynamicLayout;
1892	}
1893
1894	bool PolyGenericCalculator::findGeneric( Type *ty ) {
1895	ty = replaceTypeInst( ty, env );
1896
1897	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( ty ) ) {
1898	if ( scopeTyVars.find( typeInst->get_name() ) != scopeTyVars.end() ) {
1899	// NOTE assumes here that getting put in the scopeTyVars included having the layout variables set
1900	return true;
1901	}
1902	return false;
1903	} else if ( StructInstType structTy = dynamic_cast< StructInstType >( ty ) ) {
1904	// check if this type already has a layout generated for it
1905	std::string typeName = mangleType( ty );
1906	if ( knownLayouts.find( typeName ) != knownLayouts.end() ) return true;
1907
1908	// check if any of the type parameters have dynamic layout; if none do, this type is (or will be) monomorphized
1909	std::list< Type* > otypeParams;
1910	if ( ! findGenericParams( *structTy->get_baseParameters(), structTy->get_parameters(), otypeParams ) ) return false;
1911
1912	// insert local variables for layout and generate call to layout function
1913	knownLayouts.insert( typeName ); // done early so as not to interfere with the later addition of parameters to the layout call
1914	Type *layoutType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
1915
1916	int n_members = structTy->get_baseStruct()->get_members().size();
1917	if ( n_members == 0 ) {
1918	// all empty structs have the same layout - size 1, align 1
1919	makeVar( sizeofName( typeName ), layoutType, new SingleInit( new ConstantExpr( Constant::from_ulong( (unsigned long)1 ) ) ) );
1920	makeVar( alignofName( typeName ), layoutType->clone(), new SingleInit( new ConstantExpr( Constant::from_ulong( (unsigned long)1 ) ) ) );
1921	// NOTE zero-length arrays are forbidden in C, so empty structs have no offsetof array
1922	} else {
1923	ObjectDecl *sizeVar = makeVar( sizeofName( typeName ), layoutType );
1924	ObjectDecl *alignVar = makeVar( alignofName( typeName ), layoutType->clone() );
1925	ObjectDecl *offsetVar = makeVar( offsetofName( typeName ), new ArrayType( Type::Qualifiers(), layoutType->clone(), new ConstantExpr( Constant::from_int( n_members ) ), false, false ) );
1926
1927	// generate call to layout function
1928	UntypedExpr *layoutCall = new UntypedExpr( new NameExpr( layoutofName( structTy->get_baseStruct() ) ) );
1929	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( sizeVar ) ) );
1930	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( alignVar ) ) );
1931	layoutCall->get_args().push_back( new VariableExpr( offsetVar ) );
1932	addOtypeParamsToLayoutCall( layoutCall, otypeParams );
1933
1934	stmtsToAdd.push_back( new ExprStmt( noLabels, layoutCall ) );
1935	}
1936
1937	return true;
1938	} else if ( UnionInstType unionTy = dynamic_cast< UnionInstType >( ty ) ) {
1939	// check if this type already has a layout generated for it
1940	std::string typeName = mangleType( ty );
1941	if ( knownLayouts.find( typeName ) != knownLayouts.end() ) return true;
1942
1943	// check if any of the type parameters have dynamic layout; if none do, this type is (or will be) monomorphized
1944	std::list< Type* > otypeParams;
1945	if ( ! findGenericParams( *unionTy->get_baseParameters(), unionTy->get_parameters(), otypeParams ) ) return false;
1946
1947	// insert local variables for layout and generate call to layout function
1948	knownLayouts.insert( typeName ); // done early so as not to interfere with the later addition of parameters to the layout call
1949	Type *layoutType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
1950
1951	ObjectDecl *sizeVar = makeVar( sizeofName( typeName ), layoutType );
1952	ObjectDecl *alignVar = makeVar( alignofName( typeName ), layoutType->clone() );
1953
1954	// generate call to layout function
1955	UntypedExpr *layoutCall = new UntypedExpr( new NameExpr( layoutofName( unionTy->get_baseUnion() ) ) );
1956	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( sizeVar ) ) );
1957	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( alignVar ) ) );
1958	addOtypeParamsToLayoutCall( layoutCall, otypeParams );
1959
1960	stmtsToAdd.push_back( new ExprStmt( noLabels, layoutCall ) );
1961
1962	return true;
1963	}
1964
1965	return false;
1966	}
1967
1968	Expression PolyGenericCalculator::mutate( SizeofExpr sizeofExpr ) {
1969	Type *ty = sizeofExpr->get_type();
1970	if ( findGeneric( ty ) ) {
1971	Expression *ret = new NameExpr( sizeofName( mangleType( ty ) ) );
1972	delete sizeofExpr;
1973	return ret;
1974	}
1975	return sizeofExpr;
1976	}
1977
1978	Expression PolyGenericCalculator::mutate( AlignofExpr alignofExpr ) {
1979	Type *ty = alignofExpr->get_type();
1980	if ( findGeneric( ty ) ) {
1981	Expression *ret = new NameExpr( alignofName( mangleType( ty ) ) );
1982	delete alignofExpr;
1983	return ret;
1984	}
1985	return alignofExpr;
1986	}
1987
1988	Expression PolyGenericCalculator::mutate( OffsetofExpr offsetofExpr ) {
1989	// mutate, exiting early if no longer OffsetofExpr
1990	Expression *expr = Parent::mutate( offsetofExpr );
1991	offsetofExpr = dynamic_cast< OffsetofExpr* >( expr );
1992	if ( ! offsetofExpr ) return expr;
1993
1994	// only mutate expressions for polymorphic structs/unions
1995	Type *ty = offsetofExpr->get_type();
1996	if ( ! findGeneric( ty ) ) return offsetofExpr;
1997
1998	if ( StructInstType structType = dynamic_cast< StructInstType >( ty ) ) {
1999	// replace offsetof expression by index into offset array
2000	long i = findMember( offsetofExpr->get_member(), structType->get_baseStruct()->get_members() );
2001	if ( i == -1 ) return offsetofExpr;
2002
2003	Expression *offsetInd = makeOffsetIndex( ty, i );
2004	delete offsetofExpr;
2005	return offsetInd;
2006	} else if ( dynamic_cast< UnionInstType* >( ty ) ) {
2007	// all union members are at offset zero
2008	delete offsetofExpr;
2009	return new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), "0" ) );
2010	} else return offsetofExpr;
2011	}
2012
2013	Expression PolyGenericCalculator::mutate( OffsetPackExpr offsetPackExpr ) {
2014	StructInstType *ty = offsetPackExpr->get_type();
2015
2016	Expression *ret = 0;
2017	if ( findGeneric( ty ) ) {
2018	// pull offset back from generated type information
2019	ret = new NameExpr( offsetofName( mangleType( ty ) ) );
2020	} else {
2021	std::string offsetName = offsetofName( mangleType( ty ) );
2022	if ( knownOffsets.find( offsetName ) != knownOffsets.end() ) {
2023	// use the already-generated offsets for this type
2024	ret = new NameExpr( offsetName );
2025	} else {
2026	knownOffsets.insert( offsetName );
2027
2028	std::list< Declaration* > &baseMembers = ty->get_baseStruct()->get_members();
2029	Type *offsetType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
2030
2031	// build initializer list for offset array
2032	std::list< Initializer* > inits;
2033	for ( std::list< Declaration* >::const_iterator member = baseMembers.begin(); member != baseMembers.end(); ++member ) {
2034	DeclarationWithType *memberDecl;
2035	if ( DeclarationWithType origMember = dynamic_cast< DeclarationWithType >( *member ) ) {
2036	memberDecl = origMember->clone();
2037	} else {
2038	memberDecl = new ObjectDecl( (*member)->get_name(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, offsetType->clone(), 0 );
2039	}
2040	inits.push_back( new SingleInit( new OffsetofExpr( ty->clone(), memberDecl ) ) );
2041	}
2042
2043	// build the offset array and replace the pack with a reference to it
2044	ObjectDecl *offsetArray = makeVar( offsetName, new ArrayType( Type::Qualifiers(), offsetType, new ConstantExpr( Constant::from_ulong( baseMembers.size() ) ), false, false ),
2045	new ListInit( inits ) );
2046	ret = new VariableExpr( offsetArray );
2047	}
2048	}
2049
2050	delete offsetPackExpr;
2051	return ret;
2052	}
2053
2054	void PolyGenericCalculator::doBeginScope() {
2055	knownLayouts.beginScope();
2056	knownOffsets.beginScope();
2057	}
2058
2059	void PolyGenericCalculator::doEndScope() {
2060	knownLayouts.endScope();
2061	knownOffsets.endScope();
2062	}
2063
2064	////////////////////////////////////////// Pass3 ////////////////////////////////////////////////////
2065
2066	template< typename DeclClass >
2067	DeclClass * Pass3::handleDecl( DeclClass decl, Type type ) {
2068	scopeTyVars.beginScope();
2069	makeTyVarMap( type, scopeTyVars );
2070
2071	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
2072	ScrubTyVars::scrub( decl, scopeTyVars );
2073
2074	scopeTyVars.endScope();
2075	return ret;
2076	}
2077
2078	ObjectDecl * Pass3::mutate( ObjectDecl *objectDecl ) {
2079	return handleDecl( objectDecl, objectDecl->get_type() );
2080	}
2081
2082	DeclarationWithType * Pass3::mutate( FunctionDecl *functionDecl ) {
2083	return handleDecl( functionDecl, functionDecl->get_functionType() );
2084	}
2085
2086	TypedefDecl * Pass3::mutate( TypedefDecl *typedefDecl ) {
2087	return handleDecl( typedefDecl, typedefDecl->get_base() );
2088	}
2089
2090	TypeDecl * Pass3::mutate( TypeDecl *typeDecl ) {
2091	// Initializer *init = 0;
2092	// std::list< Expression *> designators;
2093	// scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
2094	// if ( typeDecl->get_base() ) {
2095	// init = new SimpleInit( new SizeofExpr( handleDecl( typeDecl, typeDecl->get_base() ) ), designators );
2096	// }
2097	// return new ObjectDecl( typeDecl->get_name(), Declaration::Extern, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::UnsignedInt ), init );
2098
2099	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
2100	return Mutator::mutate( typeDecl );
2101	}
2102
2103	Type * Pass3::mutate( PointerType *pointerType ) {
2104	scopeTyVars.beginScope();
2105	makeTyVarMap( pointerType, scopeTyVars );
2106
2107	Type *ret = Mutator::mutate( pointerType );
2108
2109	scopeTyVars.endScope();
2110	return ret;
2111	}
2112
2113	Type * Pass3::mutate( FunctionType *functionType ) {
2114	scopeTyVars.beginScope();
2115	makeTyVarMap( functionType, scopeTyVars );
2116
2117	Type *ret = Mutator::mutate( functionType );
2118
2119	scopeTyVars.endScope();
2120	return ret;
2121	}
2122	} // anonymous namespace
2123	} // namespace GenPoly
2124
2125	// Local Variables: //
2126	// tab-width: 4 //
2127	// mode: c++ //
2128	// compile-command: "make install" //
2129	// End: //

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