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Box.cc@ 9f70ab57

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Last change on this file since 9f70ab57 was 5fda7143, checked in by Thierry Delisle <tdelisle@…>, 9 years ago

Merge branch 'master' of plg.uwaterloo.ca:software/cfa/cfa-cc

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src/Common/utility.h

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File size: 96.6 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 : public DeclMutator {
67	unsigned int functionNesting; // current level of nested functions
68	public:
69	LayoutFunctionBuilder() : functionNesting( 0 ) {}
70
71	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
72	virtual Declaration mutate( StructDecl structDecl );
73	virtual Declaration mutate( UnionDecl unionDecl );
74	};
75
76	/// Replaces polymorphic return types with out-parameters, replaces calls to polymorphic functions with adapter calls as needed, and adds appropriate type variables to the function call
77	class Pass1 : public PolyMutator {
78	public:
79	Pass1();
80	virtual Expression mutate( ApplicationExpr appExpr );
81	virtual Expression mutate( AddressExpr addrExpr );
82	virtual Expression mutate( UntypedExpr expr );
83	virtual DeclarationWithType* mutate( FunctionDecl *functionDecl );
84	virtual TypeDecl mutate( TypeDecl typeDecl );
85	virtual Expression mutate( CommaExpr commaExpr );
86	virtual Expression mutate( ConditionalExpr condExpr );
87	virtual Statement * mutate( ReturnStmt *returnStmt );
88	virtual Type mutate( PointerType pointerType );
89	virtual Type * mutate( FunctionType *functionType );
90
91	virtual void doBeginScope();
92	virtual void doEndScope();
93	private:
94	/// Pass the extra type parameters from polymorphic generic arguments or return types into a function application
95	void passArgTypeVars( ApplicationExpr appExpr, Type parmType, Type argBaseType, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars, std::set< std::string > &seenTypes );
96	/// passes extra type parameters into a polymorphic function application
97	void passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars );
98	/// wraps a function application with a new temporary for the out-parameter return value
99	Expression addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg );
100	/// Replaces all the type parameters of a generic type with their concrete equivalents under the current environment
101	void replaceParametersWithConcrete( ApplicationExpr appExpr, std::list< Expression >& params );
102	/// Replaces a polymorphic type with its concrete equivalant under the current environment (returns itself if concrete).
103	/// If `doClone` is set to false, will not clone interior types
104	Type replaceWithConcrete( ApplicationExpr appExpr, Type *type, bool doClone = true );
105	/// wraps a function application returning a polymorphic type with a new temporary for the out-parameter return value
106	Expression addDynRetParam( ApplicationExpr appExpr, FunctionType function, ReferenceToType polyType, std::list< Expression *>::iterator &arg );
107	Expression applyAdapter( ApplicationExpr appExpr, FunctionType function, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars );
108	void boxParam( Type formal, Expression &arg, const TyVarMap &exprTyVars );
109	void boxParams( ApplicationExpr appExpr, FunctionType function, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars );
110	void addInferredParams( ApplicationExpr appExpr, FunctionType functionType, std::list< Expression *>::iterator &arg, const TyVarMap &tyVars );
111	/// Stores assignment operators from assertion list in local map of assignment operations
112	void findTypeOps( const std::list< TypeDecl *> &forall );
113	void passAdapters( ApplicationExpr appExpr, FunctionType functionType, const TyVarMap &exprTyVars );
114	FunctionDecl makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars );
115	/// Replaces intrinsic operator functions with their arithmetic desugaring
116	Expression handleIntrinsics( ApplicationExpr appExpr );
117	/// Inserts a new temporary variable into the current scope with an auto-generated name
118	ObjectDecl makeTemporary( Type type );
119
120	ScopedMap< std::string, DeclarationWithType* > assignOps; ///< Currently known type variable assignment operators
121	ScopedMap< std::string, DeclarationWithType* > ctorOps; ///< Currently known type variable constructors
122	ScopedMap< std::string, DeclarationWithType* > copyOps; ///< Currently known type variable copy constructors
123	ScopedMap< std::string, DeclarationWithType* > dtorOps; ///< Currently known type variable destructors
124	ResolvExpr::TypeMap< DeclarationWithType > scopedAssignOps; ///< Currently known assignment operators
125	ResolvExpr::TypeMap< DeclarationWithType > scopedCtorOps; ///< Currently known assignment operators
126	ResolvExpr::TypeMap< DeclarationWithType > scopedCopyOps; ///< Currently known assignment operators
127	ResolvExpr::TypeMap< DeclarationWithType > scopedDtorOps; ///< Currently known assignment operators
128	ScopedMap< std::string, DeclarationWithType* > adapters; ///< Set of adapter functions in the current scope
129
130	DeclarationWithType *retval;
131	bool useRetval;
132	UniqueName tempNamer;
133	};
134
135	/// * Moves polymorphic returns in function types to pointer-type parameters
136	/// * adds type size and assertion parameters to parameter lists
137	class Pass2 : public PolyMutator {
138	public:
139	template< typename DeclClass >
140	DeclClass handleDecl( DeclClass decl, Type *type );
141	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
142	virtual ObjectDecl mutate( ObjectDecl objectDecl );
143	virtual TypeDecl mutate( TypeDecl typeDecl );
144	virtual TypedefDecl mutate( TypedefDecl typedefDecl );
145	virtual Type mutate( PointerType pointerType );
146	virtual Type mutate( FunctionType funcType );
147
148	private:
149	void addAdapters( FunctionType *functionType );
150
151	std::map< UniqueId, std::string > adapterName;
152	};
153
154	/// Replaces member and size/align/offsetof expressions on polymorphic generic types with calculated expressions.
155	/// * Replaces member expressions for polymorphic types with calculated add-field-offset-and-dereference
156	/// * Calculates polymorphic offsetof expressions from offset array
157	/// * Inserts dynamic calculation of polymorphic type layouts where needed
158	class PolyGenericCalculator : public PolyMutator {
159	public:
160	typedef PolyMutator Parent;
161	using Parent::mutate;
162
163	template< typename DeclClass >
164	DeclClass handleDecl( DeclClass decl, Type *type );
165	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
166	virtual ObjectDecl mutate( ObjectDecl objectDecl );
167	virtual TypedefDecl mutate( TypedefDecl objectDecl );
168	virtual TypeDecl mutate( TypeDecl objectDecl );
169	virtual Statement mutate( DeclStmt declStmt );
170	virtual Type mutate( PointerType pointerType );
171	virtual Type mutate( FunctionType funcType );
172	virtual Expression mutate( MemberExpr memberExpr );
173	virtual Expression mutate( SizeofExpr sizeofExpr );
174	virtual Expression mutate( AlignofExpr alignofExpr );
175	virtual Expression mutate( OffsetofExpr offsetofExpr );
176	virtual Expression mutate( OffsetPackExpr offsetPackExpr );
177
178	virtual void doBeginScope();
179	virtual void doEndScope();
180
181	private:
182	/// Makes a new variable in the current scope with the given name, type & optional initializer
183	ObjectDecl makeVar( const std::string &name, Type type, Initializer *init = 0 );
184	/// returns true if the type has a dynamic layout; such a layout will be stored in appropriately-named local variables when the function returns
185	bool findGeneric( Type *ty );
186	/// adds type parameters to the layout call; will generate the appropriate parameters if needed
187	void addOtypeParamsToLayoutCall( UntypedExpr layoutCall, const std::list< Type > &otypeParams );
188
189	/// Enters a new scope for type-variables, adding the type variables from ty
190	void beginTypeScope( Type *ty );
191	/// Exits the type-variable scope
192	void endTypeScope();
193
194	ScopedSet< std::string > knownLayouts; ///< Set of generic type layouts known in the current scope, indexed by sizeofName
195	ScopedSet< std::string > knownOffsets; ///< Set of non-generic types for which the offset array exists in the current scope, indexed by offsetofName
196	};
197
198	/// 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
199	class Pass3 : public PolyMutator {
200	public:
201	template< typename DeclClass >
202	DeclClass handleDecl( DeclClass decl, Type *type );
203	virtual DeclarationWithType mutate( FunctionDecl functionDecl );
204	virtual ObjectDecl mutate( ObjectDecl objectDecl );
205	virtual TypedefDecl mutate( TypedefDecl objectDecl );
206	virtual TypeDecl mutate( TypeDecl objectDecl );
207	virtual Type mutate( PointerType pointerType );
208	virtual Type mutate( FunctionType funcType );
209	private:
210	};
211
212	} // anonymous namespace
213
214	/// version of mutateAll with special handling for translation unit so you can check the end of the prelude when debugging
215	template< typename MutatorType >
216	inline void mutateTranslationUnit( std::list< Declaration* > &translationUnit, MutatorType &mutator ) {
217	bool seenIntrinsic = false;
218	SemanticError errors;
219	for ( typename std::list< Declaration* >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) {
220	try {
221	if ( *i ) {
222	if ( (*i)->get_linkage() == LinkageSpec::Intrinsic ) {
223	seenIntrinsic = true;
224	} else if ( seenIntrinsic ) {
225	seenIntrinsic = false; // break on this line when debugging for end of prelude
226	}
227
228	i = dynamic_cast< Declaration >( (*i)->acceptMutator( mutator ) );
229	assert( *i );
230	} // if
231	} catch( SemanticError &e ) {
232	errors.append( e );
233	} // try
234	} // for
235	if ( ! errors.isEmpty() ) {
236	throw errors;
237	} // if
238	}
239
240	void box( std::list< Declaration *>& translationUnit ) {
241	LayoutFunctionBuilder layoutBuilder;
242	Pass1 pass1;
243	Pass2 pass2;
244	PolyGenericCalculator polyCalculator;
245	Pass3 pass3;
246
247	layoutBuilder.mutateDeclarationList( translationUnit );
248	mutateTranslationUnit/All/( translationUnit, pass1 );
249	mutateTranslationUnit/All/( translationUnit, pass2 );
250	mutateTranslationUnit/All/( translationUnit, polyCalculator );
251	mutateTranslationUnit/All/( translationUnit, pass3 );
252	}
253
254	////////////////////////////////// LayoutFunctionBuilder ////////////////////////////////////////////
255
256	DeclarationWithType LayoutFunctionBuilder::mutate( FunctionDecl functionDecl ) {
257	functionDecl->set_functionType( maybeMutate( functionDecl->get_functionType(), *this ) );
258	mutateAll( functionDecl->get_oldDecls(), *this );
259	++functionNesting;
260	functionDecl->set_statements( maybeMutate( functionDecl->get_statements(), *this ) );
261	--functionNesting;
262	return functionDecl;
263	}
264
265	/// Get a list of type declarations that will affect a layout function
266	std::list< TypeDecl* > takeOtypeOnly( std::list< TypeDecl* > &decls ) {
267	std::list< TypeDecl * > otypeDecls;
268
269	for ( std::list< TypeDecl* >::const_iterator decl = decls.begin(); decl != decls.end(); ++decl ) {
270	if ( (*decl)->get_kind() == TypeDecl::Any ) {
271	otypeDecls.push_back( *decl );
272	}
273	}
274
275	return otypeDecls;
276	}
277
278	/// Adds parameters for otype layout to a function type
279	void addOtypeParams( FunctionType layoutFnType, std::list< TypeDecl > &otypeParams ) {
280	BasicType sizeAlignType( Type::Qualifiers(), BasicType::LongUnsignedInt );
281
282	for ( std::list< TypeDecl* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
283	TypeInstType paramType( Type::Qualifiers(), (param)->get_name(), param );
284	std::string paramName = mangleType( &paramType );
285	layoutFnType->get_parameters().push_back( new ObjectDecl( sizeofName( paramName ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
286	layoutFnType->get_parameters().push_back( new ObjectDecl( alignofName( paramName ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignType.clone(), 0 ) );
287	}
288	}
289
290	/// Builds a layout function declaration
291	FunctionDecl buildLayoutFunctionDecl( AggregateDecl typeDecl, unsigned int functionNesting, FunctionType *layoutFnType ) {
292	// Routines at global scope marked "static" to prevent multiple definitions is separate translation units
293	// because each unit generates copies of the default routines for each aggregate.
294	FunctionDecl *layoutDecl = new FunctionDecl(
295	layoutofName( typeDecl ), functionNesting > 0 ? DeclarationNode::NoStorageClass : DeclarationNode::Static, LinkageSpec::AutoGen, layoutFnType, new CompoundStmt( noLabels ), true, false );
296	layoutDecl->fixUniqueId();
297	return layoutDecl;
298	}
299
300	/// Makes a unary operation
301	Expression makeOp( const std::string &name, Expression arg ) {
302	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
303	expr->get_args().push_back( arg );
304	return expr;
305	}
306
307	/// Makes a binary operation
308	Expression makeOp( const std::string &name, Expression lhs, Expression *rhs ) {
309	UntypedExpr *expr = new UntypedExpr( new NameExpr( name ) );
310	expr->get_args().push_back( lhs );
311	expr->get_args().push_back( rhs );
312	return expr;
313	}
314
315	/// Returns the dereference of a local pointer variable
316	Expression derefVar( ObjectDecl var ) {
317	return makeOp( "*?", new VariableExpr( var ) );
318	}
319
320	/// makes an if-statement with a single-expression if-block and no then block
321	Statement makeCond( Expression cond, Expression *ifPart ) {
322	return new IfStmt( noLabels, cond, new ExprStmt( noLabels, ifPart ), 0 );
323	}
324
325	/// makes a statement that assigns rhs to lhs if lhs < rhs
326	Statement makeAssignMax( Expression lhs, Expression *rhs ) {
327	return makeCond( makeOp( "?<?", lhs, rhs ), makeOp( "?=?", lhs->clone(), rhs->clone() ) );
328	}
329
330	/// makes a statement that aligns lhs to rhs (rhs should be an integer power of two)
331	Statement makeAlignTo( Expression lhs, Expression *rhs ) {
332	// check that the lhs is zeroed out to the level of rhs
333	Expression *ifCond = makeOp( "?&?", lhs, makeOp( "?-?", rhs, new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), "1" ) ) ) );
334	// if not aligned, increment to alignment
335	Expression *ifExpr = makeOp( "?+=?", lhs->clone(), makeOp( "?-?", rhs->clone(), ifCond->clone() ) );
336	return makeCond( ifCond, ifExpr );
337	}
338
339	/// adds an expression to a compound statement
340	void addExpr( CompoundStmt stmts, Expression expr ) {
341	stmts->get_kids().push_back( new ExprStmt( noLabels, expr ) );
342	}
343
344	/// adds a statement to a compound statement
345	void addStmt( CompoundStmt stmts, Statement stmt ) {
346	stmts->get_kids().push_back( stmt );
347	}
348
349	Declaration LayoutFunctionBuilder::mutate( StructDecl structDecl ) {
350	// do not generate layout function for "empty" tag structs
351	if ( structDecl->get_members().empty() ) return structDecl;
352
353	// get parameters that can change layout, exiting early if none
354	std::list< TypeDecl* > otypeParams = takeOtypeOnly( structDecl->get_parameters() );
355	if ( otypeParams.empty() ) return structDecl;
356
357	// build layout function signature
358	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
359	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
360	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
361
362	ObjectDecl *sizeParam = new ObjectDecl( sizeofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
363	layoutFnType->get_parameters().push_back( sizeParam );
364	ObjectDecl *alignParam = new ObjectDecl( alignofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
365	layoutFnType->get_parameters().push_back( alignParam );
366	ObjectDecl *offsetParam = new ObjectDecl( offsetofName( structDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
367	layoutFnType->get_parameters().push_back( offsetParam );
368	addOtypeParams( layoutFnType, otypeParams );
369
370	// build function decl
371	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( structDecl, functionNesting, layoutFnType );
372
373	// calculate struct layout in function body
374
375	// initialize size and alignment to 0 and 1 (will have at least one member to re-edit size
376	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "0" ) ) ) );
377	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
378	unsigned long n_members = 0;
379	bool firstMember = true;
380	for ( std::list< Declaration* >::const_iterator member = structDecl->get_members().begin(); member != structDecl->get_members().end(); ++member ) {
381	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
382	assert( dwt );
383	Type *memberType = dwt->get_type();
384
385	if ( firstMember ) {
386	firstMember = false;
387	} else {
388	// make sure all members after the first (automatically aligned at 0) are properly padded for alignment
389	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), new AlignofExpr( memberType->clone() ) ) );
390	}
391
392	// place current size in the current offset index
393	addExpr( layoutDecl->get_statements(), makeOp( "?=?", makeOp( "?[?]", new VariableExpr( offsetParam ), new ConstantExpr( Constant::from_ulong( n_members ) ) ),
394	derefVar( sizeParam ) ) );
395	++n_members;
396
397	// add member size to current size
398	addExpr( layoutDecl->get_statements(), makeOp( "?+=?", derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
399
400	// take max of member alignment and global alignment
401	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
402	}
403	// make sure the type is end-padded to a multiple of its alignment
404	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
405
406	addDeclarationAfter( layoutDecl );
407	return structDecl;
408	}
409
410	Declaration LayoutFunctionBuilder::mutate( UnionDecl unionDecl ) {
411	// do not generate layout function for "empty" tag unions
412	if ( unionDecl->get_members().empty() ) return unionDecl;
413
414	// get parameters that can change layout, exiting early if none
415	std::list< TypeDecl* > otypeParams = takeOtypeOnly( unionDecl->get_parameters() );
416	if ( otypeParams.empty() ) return unionDecl;
417
418	// build layout function signature
419	FunctionType *layoutFnType = new FunctionType( Type::Qualifiers(), false );
420	BasicType *sizeAlignType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
421	PointerType *sizeAlignOutType = new PointerType( Type::Qualifiers(), sizeAlignType );
422
423	ObjectDecl *sizeParam = new ObjectDecl( sizeofName( unionDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType, 0 );
424	layoutFnType->get_parameters().push_back( sizeParam );
425	ObjectDecl *alignParam = new ObjectDecl( alignofName( unionDecl->get_name() ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, sizeAlignOutType->clone(), 0 );
426	layoutFnType->get_parameters().push_back( alignParam );
427	addOtypeParams( layoutFnType, otypeParams );
428
429	// build function decl
430	FunctionDecl *layoutDecl = buildLayoutFunctionDecl( unionDecl, functionNesting, layoutFnType );
431
432	// calculate union layout in function body
433	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( sizeParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
434	addExpr( layoutDecl->get_statements(), makeOp( "?=?", derefVar( alignParam ), new ConstantExpr( Constant( sizeAlignType->clone(), "1" ) ) ) );
435	for ( std::list< Declaration* >::const_iterator member = unionDecl->get_members().begin(); member != unionDecl->get_members().end(); ++member ) {
436	DeclarationWithType dwt = dynamic_cast< DeclarationWithType >( *member );
437	assert( dwt );
438	Type *memberType = dwt->get_type();
439
440	// take max member size and global size
441	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( sizeParam ), new SizeofExpr( memberType->clone() ) ) );
442
443	// take max of member alignment and global alignment
444	addStmt( layoutDecl->get_statements(), makeAssignMax( derefVar( alignParam ), new AlignofExpr( memberType->clone() ) ) );
445	}
446	// make sure the type is end-padded to a multiple of its alignment
447	addStmt( layoutDecl->get_statements(), makeAlignTo( derefVar( sizeParam ), derefVar( alignParam ) ) );
448
449	addDeclarationAfter( layoutDecl );
450	return unionDecl;
451	}
452
453	////////////////////////////////////////// Pass1 ////////////////////////////////////////////////////
454
455	namespace {
456	std::string makePolyMonoSuffix( FunctionType * function, const TyVarMap &tyVars ) {
457	std::stringstream name;
458
459	// NOTE: this function previously used isPolyObj, which failed to produce
460	// the correct thing in some situations. It's not clear to me why this wasn't working.
461
462	// if the return type or a parameter type involved polymorphic types, then the adapter will need
463	// to take those polymorphic types as pointers. Therefore, there can be two different functions
464	// with the same mangled name, so we need to further mangle the names.
465	for ( std::list< DeclarationWithType *>::iterator retval = function->get_returnVals().begin(); retval != function->get_returnVals().end(); ++retval ) {
466	if ( isPolyType( (*retval)->get_type(), tyVars ) ) {
467	name << "P";
468	} else {
469	name << "M";
470	}
471	}
472	name << "_";
473	std::list< DeclarationWithType *> &paramList = function->get_parameters();
474	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
475	if ( isPolyType( (*arg)->get_type(), tyVars ) ) {
476	name << "P";
477	} else {
478	name << "M";
479	}
480	} // for
481	return name.str();
482	}
483
484	std::string mangleAdapterName( FunctionType * function, const TyVarMap &tyVars ) {
485	return SymTab::Mangler::mangle( function ) + makePolyMonoSuffix( function, tyVars );
486	}
487
488	std::string makeAdapterName( const std::string &mangleName ) {
489	return "_adapter" + mangleName;
490	}
491
492	Pass1::Pass1() : useRetval( false ), tempNamer( "_temp" ) {}
493
494	/// Returns T if the given declaration is a function with parameter (T*) for some TypeInstType T, NULL otherwise
495	TypeInstType isTypeInstPtrFn( DeclarationWithType decl ) {
496	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
497	if ( funType->get_parameters().size() == 1 ) {
498	if ( PointerType pointer = dynamic_cast< PointerType >( funType->get_parameters().front()->get_type() ) ) {
499	if ( TypeInstType refType = dynamic_cast< TypeInstType >( pointer->get_base() ) ) {
500	return refType;
501	} // if
502	} // if
503	} // if
504	} // if
505	return 0;
506	}
507
508	/// Returns T if the given declaration is a function with parameters (T*, T) for some TypeInstType T, NULL otherwise
509	TypeInstType isTypeInstPtrValFn( DeclarationWithType decl ) {
510	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
511	if ( funType->get_parameters().size() == 2 ) {
512	if ( PointerType pointer = dynamic_cast< PointerType >( funType->get_parameters().front()->get_type() ) ) {
513	if ( TypeInstType refType = dynamic_cast< TypeInstType >( pointer->get_base() ) ) {
514	if ( TypeInstType refType2 = dynamic_cast< TypeInstType >( funType->get_parameters().back()->get_type() ) ) {
515	if ( refType->get_name() == refType2->get_name() ) {
516	return refType;
517	} // if
518	} // if
519	} // if
520	} // if
521	} // if
522	} // if
523	return 0;
524	}
525
526	/// Returns T if the given declaration is (?=?)(T , T) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
527	TypeInstType isTypeInstAssignment( DeclarationWithType decl ) {
528	return decl->get_name() == "?=?" ? isTypeInstPtrValFn( decl ) : 0;
529	}
530
531	/// Returns T if the given declaration is (?{})(T ) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
532	TypeInstType isTypeInstCtor( DeclarationWithType decl ) {
533	return decl->get_name() == "?{}" ? isTypeInstPtrFn( decl ) : 0;
534	}
535
536	/// Returns T if the given declaration is (?{})(T , T) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
537	TypeInstType isTypeInstCopy( DeclarationWithType decl ) {
538	return decl->get_name() == "?{}" ? isTypeInstPtrValFn( decl ) : 0;
539	}
540
541	/// Returns T if the given declaration is (^?{})(T ) for some TypeInstType T (return not checked, but maybe should be), NULL otherwise
542	TypeInstType isTypeInstDtor( DeclarationWithType decl ) {
543	return decl->get_name() == "^?{}" ? isTypeInstPtrFn( decl ) : 0;
544	}
545
546	/// Returns T if the given declaration is a function with parameters (T*, T) for some type T, where neither parameter is cv-qualified,
547	/// NULL otherwise
548	Type isNoCvPtrFn( DeclarationWithType decl ) {
549	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
550	if ( funType->get_parameters().size() == 1 ) {
551	Type::Qualifiers defaultQualifiers;
552	Type *paramType = funType->get_parameters().front()->get_type();
553	if ( paramType->get_qualifiers() != defaultQualifiers ) return 0;
554
555	if ( PointerType pointerType = dynamic_cast< PointerType >( paramType ) ) {
556	Type *baseType = pointerType->get_base();
557	if ( baseType->get_qualifiers() == defaultQualifiers ) {
558	return baseType;
559	} // if
560	} // if
561	} // if
562	} // if
563	return 0;
564	}
565
566	/// Returns T if the given declaration is a function with parameters (T*, T) for some type T, where neither parameter is cv-qualified,
567	/// NULL otherwise
568	Type isNoCvPtrValFn( DeclarationWithType decl ) {
569	if ( FunctionType *funType = getFunctionType( decl->get_type() ) ) {
570	if ( funType->get_parameters().size() == 2 ) {
571	Type::Qualifiers defaultQualifiers;
572	Type *paramType1 = funType->get_parameters().front()->get_type();
573	if ( paramType1->get_qualifiers() != defaultQualifiers ) return 0;
574	Type *paramType2 = funType->get_parameters().back()->get_type();
575	if ( paramType2->get_qualifiers() != defaultQualifiers ) return 0;
576
577	if ( PointerType pointerType = dynamic_cast< PointerType >( paramType1 ) ) {
578	Type *baseType1 = pointerType->get_base();
579	if ( baseType1->get_qualifiers() != defaultQualifiers ) return 0;
580	SymTab::Indexer dummy;
581	if ( ResolvExpr::typesCompatible( baseType1, paramType2, dummy ) ) {
582	return baseType1;
583	} // if
584	} // if
585	} // if
586	} // if
587	return 0;
588	}
589
590	/// returns T if the given declaration is: (?=?)(T , T) for some type T (return not checked, but maybe should be), NULL otherwise
591	/// Only picks assignments where neither parameter is cv-qualified
592	Type isAssignment( DeclarationWithType decl ) {
593	return decl->get_name() == "?=?" ? isNoCvPtrValFn( decl ) : 0;
594	}
595
596	/// returns T if the given declaration is: (?{})(T ) for some type T, NULL otherwise
597	/// Only picks ctors where the parameter is not cv-qualified
598	Type isCtor( DeclarationWithType decl ) {
599	return decl->get_name() == "?{}" ? isNoCvPtrFn( decl ) : 0;
600	}
601
602	/// returns T if the given declaration is: (?{})(T , T) for some type T (return not checked, but maybe should be), NULL otherwise
603	/// Only picks copy constructors where neither parameter is cv-qualified
604	Type isCopy( DeclarationWithType decl ) {
605	return decl->get_name() == "?{}" ? isNoCvPtrValFn( decl ) : 0;
606	}
607
608	/// returns T if the given declaration is: (?{})(T ) for some type T, NULL otherwise
609	/// Only picks ctors where the parameter is not cv-qualified
610	Type isDtor( DeclarationWithType decl ) {
611	return decl->get_name() == "^?{}" ? isNoCvPtrFn( decl ) : 0;
612	}
613
614	void Pass1::findTypeOps( const std::list< TypeDecl *> &forall ) {
615	// what if a nested function uses an assignment operator?
616	// assignOps.clear();
617	for ( std::list< TypeDecl *>::const_iterator i = forall.begin(); i != forall.end(); ++i ) {
618	for ( std::list< DeclarationWithType >::const_iterator assert = (i)->get_assertions().begin(); assert != (*i)->get_assertions().end(); ++assert ) {
619	std::string typeName;
620	if ( TypeInstType typeInst = isTypeInstAssignment( assert ) ) {
621	assignOps[ typeInst->get_name() ] = *assert;
622	} else if ( TypeInstType typeInst = isTypeInstCtor( assert ) ) {
623	ctorOps[ typeInst->get_name() ] = *assert;
624	} else if ( TypeInstType typeInst = isTypeInstCopy( assert ) ) {
625	copyOps[ typeInst->get_name() ] = *assert;
626	} else if ( TypeInstType typeInst = isTypeInstDtor( assert ) ) {
627	dtorOps[ typeInst->get_name() ] = *assert;
628	} // if
629	} // for
630	} // for
631	}
632
633	DeclarationWithType Pass1::mutate( FunctionDecl functionDecl ) {
634	// if this is a assignment function, put it in the map for this scope
635	if ( Type *paramType = isAssignment( functionDecl ) ) {
636	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
637	scopedAssignOps.insert( paramType, functionDecl );
638	}
639	} else if ( Type *paramType = isCtor( functionDecl ) ) {
640	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
641	scopedCtorOps.insert( paramType, functionDecl );
642	}
643	} else if ( Type *paramType = isCopy( functionDecl ) ) {
644	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
645	scopedCopyOps.insert( paramType, functionDecl );
646	}
647	} else if ( Type *paramType = isDtor( functionDecl ) ) {
648	if ( ! dynamic_cast< TypeInstType* >( paramType ) ) {
649	scopedDtorOps.insert( paramType, functionDecl );
650	}
651	}
652
653	if ( functionDecl->get_statements() ) { // empty routine body ?
654	doBeginScope();
655	scopeTyVars.beginScope();
656	assignOps.beginScope();
657	ctorOps.beginScope();
658	copyOps.beginScope();
659	dtorOps.beginScope();
660
661	DeclarationWithType *oldRetval = retval;
662	bool oldUseRetval = useRetval;
663
664	// process polymorphic return value
665	retval = 0;
666	if ( isDynRet( functionDecl->get_functionType() ) && functionDecl->get_linkage() == LinkageSpec::Cforall ) {
667	retval = functionDecl->get_functionType()->get_returnVals().front();
668
669	// give names to unnamed return values
670	if ( retval->get_name() == "" ) {
671	retval->set_name( "_retparm" );
672	retval->set_linkage( LinkageSpec::C );
673	} // if
674	} // if
675
676	FunctionType *functionType = functionDecl->get_functionType();
677	makeTyVarMap( functionDecl->get_functionType(), scopeTyVars );
678	findTypeOps( functionDecl->get_functionType()->get_forall() );
679
680	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
681	std::list< FunctionType *> functions;
682	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
683	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
684	findFunction( (*assert)->get_type(), functions, scopeTyVars, needsAdapter );
685	} // for
686	} // for
687	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
688	findFunction( (*arg)->get_type(), functions, scopeTyVars, needsAdapter );
689	} // for
690
691	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
692	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
693	if ( adapters.find( mangleName ) == adapters.end() ) {
694	std::string adapterName = makeAdapterName( mangleName );
695	adapters.insert( std::pair< std::string, DeclarationWithType >( mangleName, new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( funType, scopeTyVars ) ), 0 ) ) );
696	} // if
697	} // for
698
699	functionDecl->set_statements( functionDecl->get_statements()->acceptMutator( *this ) );
700
701	scopeTyVars.endScope();
702	assignOps.endScope();
703	ctorOps.endScope();
704	copyOps.endScope();
705	dtorOps.endScope();
706	retval = oldRetval;
707	useRetval = oldUseRetval;
708	doEndScope();
709	} // if
710	return functionDecl;
711	}
712
713	TypeDecl Pass1::mutate( TypeDecl typeDecl ) {
714	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
715	return Mutator::mutate( typeDecl );
716	}
717
718	Expression Pass1::mutate( CommaExpr commaExpr ) {
719	bool oldUseRetval = useRetval;
720	useRetval = false;
721	commaExpr->set_arg1( maybeMutate( commaExpr->get_arg1(), *this ) );
722	useRetval = oldUseRetval;
723	commaExpr->set_arg2( maybeMutate( commaExpr->get_arg2(), *this ) );
724	return commaExpr;
725	}
726
727	Expression Pass1::mutate( ConditionalExpr condExpr ) {
728	bool oldUseRetval = useRetval;
729	useRetval = false;
730	condExpr->set_arg1( maybeMutate( condExpr->get_arg1(), *this ) );
731	useRetval = oldUseRetval;
732	condExpr->set_arg2( maybeMutate( condExpr->get_arg2(), *this ) );
733	condExpr->set_arg3( maybeMutate( condExpr->get_arg3(), *this ) );
734	return condExpr;
735
736	}
737
738	void Pass1::passArgTypeVars( ApplicationExpr appExpr, Type parmType, Type argBaseType, std::list< Expression >::iterator &arg, const TyVarMap &exprTyVars, std::set< std::string > &seenTypes ) {
739	Type *polyType = isPolyType( parmType, exprTyVars );
740	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
741	std::string typeName = mangleType( polyType );
742	if ( seenTypes.count( typeName ) ) return;
743
744	arg = appExpr->get_args().insert( arg, new SizeofExpr( argBaseType->clone() ) );
745	arg++;
746	arg = appExpr->get_args().insert( arg, new AlignofExpr( argBaseType->clone() ) );
747	arg++;
748	if ( dynamic_cast< StructInstType* >( polyType ) ) {
749	if ( StructInstType argBaseStructType = dynamic_cast< StructInstType >( argBaseType ) ) {
750	// zero-length arrays are forbidden by C, so don't pass offset for empty struct
751	if ( ! argBaseStructType->get_baseStruct()->get_members().empty() ) {
752	arg = appExpr->get_args().insert( arg, new OffsetPackExpr( argBaseStructType->clone() ) );
753	arg++;
754	}
755	} else {
756	throw SemanticError( "Cannot pass non-struct type for generic struct" );
757	}
758	}
759
760	seenTypes.insert( typeName );
761	}
762	}
763
764	void Pass1::passTypeVars( ApplicationExpr appExpr, ReferenceToType polyRetType, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
765	// pass size/align for type variables
766	for ( TyVarMap::const_iterator tyParm = exprTyVars.begin(); tyParm != exprTyVars.end(); ++tyParm ) {
767	ResolvExpr::EqvClass eqvClass;
768	assert( env );
769	if ( tyParm->second == TypeDecl::Any ) {
770	Type *concrete = env->lookup( tyParm->first );
771	if ( concrete ) {
772	arg = appExpr->get_args().insert( arg, new SizeofExpr( concrete->clone() ) );
773	arg++;
774	arg = appExpr->get_args().insert( arg, new AlignofExpr( concrete->clone() ) );
775	arg++;
776	} else {
777	// xxx - should this be an assertion?
778	throw SemanticError( "unbound type variable: " + tyParm->first + " in application ", appExpr );
779	} // if
780	} // if
781	} // for
782
783	// add size/align for generic types to parameter list
784	if ( appExpr->get_function()->get_results().empty() ) return;
785	FunctionType *funcType = getFunctionType( appExpr->get_function()->get_results().front() );
786	assert( funcType );
787
788	std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin();
789	std::list< Expression* >::const_iterator fnArg = arg;
790	std::set< std::string > seenTypes; ///< names for generic types we've seen
791
792	// a polymorphic return type may need to be added to the argument list
793	if ( polyRetType ) {
794	Type *concRetType = replaceWithConcrete( appExpr, polyRetType );
795	passArgTypeVars( appExpr, polyRetType, concRetType, arg, exprTyVars, seenTypes );
796	}
797
798	// add type information args for presently unseen types in parameter list
799	for ( ; fnParm != funcType->get_parameters().end() && fnArg != appExpr->get_args().end(); ++fnParm, ++fnArg ) {
800	VariableExpr fnArgBase = getBaseVar( fnArg );
801	if ( ! fnArgBase \|\| fnArgBase->get_results().empty() ) continue;
802	passArgTypeVars( appExpr, (*fnParm)->get_type(), fnArgBase->get_results().front(), arg, exprTyVars, seenTypes );
803	}
804	}
805
806	ObjectDecl Pass1::makeTemporary( Type type ) {
807	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, 0 );
808	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
809	return newObj;
810	}
811
812	Expression Pass1::addRetParam( ApplicationExpr appExpr, FunctionType function, Type retType, std::list< Expression *>::iterator &arg ) {
813	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
814	// if ( useRetval ) {
815	// assert( retval );
816	// arg = appExpr->get_args().insert( arg, new VariableExpr( retval ) );
817	// arg++;
818	// } else {
819
820	// Create temporary to hold return value of polymorphic function and produce that temporary as a result
821	// using a comma expression. Possibly change comma expression into statement expression "{}" for multiple
822	// return values.
823	ObjectDecl *newObj = makeTemporary( retType->clone() );
824	Expression *paramExpr = new VariableExpr( newObj );
825
826	// If the type of the temporary is not polymorphic, box temporary by taking its address;
827	// otherwise the temporary is already boxed and can be used directly.
828	if ( ! isPolyType( newObj->get_type(), scopeTyVars, env ) ) {
829	paramExpr = new AddressExpr( paramExpr );
830	} // if
831	arg = appExpr->get_args().insert( arg, paramExpr ); // add argument to function call
832	arg++;
833	// Build a comma expression to call the function and emulate a normal return.
834	CommaExpr *commaExpr = new CommaExpr( appExpr, new VariableExpr( newObj ) );
835	commaExpr->set_env( appExpr->get_env() );
836	appExpr->set_env( 0 );
837	return commaExpr;
838	// } // if
839	// return appExpr;
840	}
841
842	void Pass1::replaceParametersWithConcrete( ApplicationExpr appExpr, std::list< Expression >& params ) {
843	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
844	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
845	assert(paramType && "Aggregate parameters should be type expressions");
846	paramType->set_type( replaceWithConcrete( appExpr, paramType->get_type(), false ) );
847	}
848	}
849
850	Type Pass1::replaceWithConcrete( ApplicationExpr appExpr, Type *type, bool doClone ) {
851	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
852	Type *concrete = env->lookup( typeInst->get_name() );
853	if ( concrete == 0 ) {
854	throw SemanticError( "Unbound type variable " + typeInst->get_name() + " in ", appExpr );
855	} // if
856	return concrete;
857	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
858	if ( doClone ) {
859	structType = structType->clone();
860	}
861	replaceParametersWithConcrete( appExpr, structType->get_parameters() );
862	return structType;
863	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
864	if ( doClone ) {
865	unionType = unionType->clone();
866	}
867	replaceParametersWithConcrete( appExpr, unionType->get_parameters() );
868	return unionType;
869	}
870	return type;
871	}
872
873	Expression Pass1::addDynRetParam( ApplicationExpr appExpr, FunctionType function, ReferenceToType dynType, std::list< Expression *>::iterator &arg ) {
874	assert( env );
875	Type *concrete = replaceWithConcrete( appExpr, dynType );
876	// add out-parameter for return value
877	return addRetParam( appExpr, function, concrete, arg );
878	}
879
880	Expression Pass1::applyAdapter( ApplicationExpr appExpr, FunctionType function, std::list< Expression >::iterator &arg, const TyVarMap &tyVars ) {
881	Expression *ret = appExpr;
882	// if ( ! function->get_returnVals().empty() && isPolyType( function->get_returnVals().front()->get_type(), tyVars ) ) {
883	if ( isDynRet( function, tyVars ) ) {
884	ret = addRetParam( appExpr, function, function->get_returnVals().front()->get_type(), arg );
885	} // if
886	std::string mangleName = mangleAdapterName( function, tyVars );
887	std::string adapterName = makeAdapterName( mangleName );
888
889	// cast adaptee to void (*)(), since it may have any type inside a polymorphic function
890	Type * adapteeType = new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) );
891	appExpr->get_args().push_front( new CastExpr( appExpr->get_function(), adapteeType ) );
892	appExpr->set_function( new NameExpr( adapterName ) );
893
894	return ret;
895	}
896
897	void Pass1::boxParam( Type param, Expression &arg, const TyVarMap &exprTyVars ) {
898	assert( ! arg->get_results().empty() );
899	if ( isPolyType( param, exprTyVars ) ) {
900	if ( isPolyType( arg->get_results().front() ) ) {
901	// if the argument's type is polymorphic, we don't need to box again!
902	return;
903	} else if ( arg->get_results().front()->get_isLvalue() ) {
904	// VariableExpr and MemberExpr are lvalues; need to check this isn't coming from the second arg of a comma expression though (not an lvalue)
905	// xxx - need to test that this code is still reachable
906	if ( CommaExpr commaArg = dynamic_cast< CommaExpr >( arg ) ) {
907	commaArg->set_arg2( new AddressExpr( commaArg->get_arg2() ) );
908	} else {
909	arg = new AddressExpr( arg );
910	}
911	} else {
912	// use type computed in unification to declare boxed variables
913	Type * newType = param->clone();
914	if ( env ) env->apply( newType );
915	ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, newType, 0 );
916	newObj->get_type()->get_qualifiers() = Type::Qualifiers(); // TODO: is this right???
917	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
918	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
919	assign->get_args().push_back( new VariableExpr( newObj ) );
920	assign->get_args().push_back( arg );
921	stmtsToAdd.push_back( new ExprStmt( noLabels, assign ) );
922	arg = new AddressExpr( new VariableExpr( newObj ) );
923	} // if
924	} // if
925	}
926
927	/// cast parameters to polymorphic functions so that types are replaced with
928	/// void * if they are type parameters in the formal type.
929	/// this gets rid of warnings from gcc.
930	void addCast( Expression &actual, Type formal, const TyVarMap &tyVars ) {
931	if ( getFunctionType( formal ) ) {
932	Type * newType = formal->clone();
933	newType = ScrubTyVars::scrub( newType, tyVars );
934	actual = new CastExpr( actual, newType );
935	} // if
936	}
937
938	void Pass1::boxParams( ApplicationExpr appExpr, FunctionType function, std::list< Expression *>::iterator &arg, const TyVarMap &exprTyVars ) {
939	for ( std::list< DeclarationWithType *>::const_iterator param = function->get_parameters().begin(); param != function->get_parameters().end(); ++param, ++arg ) {
940	assert( arg != appExpr->get_args().end() );
941	addCast( arg, (param)->get_type(), exprTyVars );
942	boxParam( (param)->get_type(), arg, exprTyVars );
943	} // for
944	}
945
946	void Pass1::addInferredParams( ApplicationExpr appExpr, FunctionType functionType, std::list< Expression *>::iterator &arg, const TyVarMap &tyVars ) {
947	std::list< Expression *>::iterator cur = arg;
948	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
949	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
950	InferredParams::const_iterator inferParam = appExpr->get_inferParams().find( (*assert)->get_uniqueId() );
951	assert( inferParam != appExpr->get_inferParams().end() && "NOTE: Explicit casts of polymorphic functions to compatible monomorphic functions are currently unsupported" );
952	Expression *newExpr = inferParam->second.expr->clone();
953	addCast( newExpr, (*assert)->get_type(), tyVars );
954	boxParam( (*assert)->get_type(), newExpr, tyVars );
955	appExpr->get_args().insert( cur, newExpr );
956	} // for
957	} // for
958	}
959
960	void makeRetParm( FunctionType *funcType ) {
961	DeclarationWithType *retParm = funcType->get_returnVals().front();
962
963	// make a new parameter that is a pointer to the type of the old return value
964	retParm->set_type( new PointerType( Type::Qualifiers(), retParm->get_type() ) );
965	funcType->get_parameters().push_front( retParm );
966
967	// we don't need the return value any more
968	funcType->get_returnVals().clear();
969	}
970
971	FunctionType makeAdapterType( FunctionType adaptee, const TyVarMap &tyVars ) {
972	// actually make the adapter type
973	FunctionType *adapter = adaptee->clone();
974	// if ( ! adapter->get_returnVals().empty() && isPolyType( adapter->get_returnVals().front()->get_type(), tyVars ) ) {
975	if ( isDynRet( adapter, tyVars ) ) {
976	makeRetParm( adapter );
977	} // if
978	adapter->get_parameters().push_front( new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), new FunctionType( Type::Qualifiers(), true ) ), 0 ) );
979	return adapter;
980	}
981
982	Expression makeAdapterArg( DeclarationWithType param, DeclarationWithType arg, DeclarationWithType realParam, const TyVarMap &tyVars ) {
983	assert( param );
984	assert( arg );
985	if ( isPolyType( realParam->get_type(), tyVars ) ) {
986	if ( ! isPolyType( arg->get_type() ) ) {
987	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
988	deref->get_args().push_back( new CastExpr( new VariableExpr( param ), new PointerType( Type::Qualifiers(), arg->get_type()->clone() ) ) );
989	deref->get_results().push_back( arg->get_type()->clone() );
990	return deref;
991	} // if
992	} // if
993	return new VariableExpr( param );
994	}
995
996	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 ) {
997	UniqueName paramNamer( "_p" );
998	for ( ; param != paramEnd; ++param, ++arg, ++realParam ) {
999	if ( (*param)->get_name() == "" ) {
1000	(*param)->set_name( paramNamer.newName() );
1001	(*param)->set_linkage( LinkageSpec::C );
1002	} // if
1003	adapteeApp->get_args().push_back( makeAdapterArg( param, arg, *realParam, tyVars ) );
1004	} // for
1005	}
1006
1007	FunctionDecl Pass1::makeAdapter( FunctionType adaptee, FunctionType *realType, const std::string &mangleName, const TyVarMap &tyVars ) {
1008	FunctionType *adapterType = makeAdapterType( adaptee, tyVars );
1009	adapterType = ScrubTyVars::scrub( adapterType, tyVars );
1010	DeclarationWithType *adapteeDecl = adapterType->get_parameters().front();
1011	adapteeDecl->set_name( "_adaptee" );
1012	ApplicationExpr *adapteeApp = new ApplicationExpr( new CastExpr( new VariableExpr( adapteeDecl ), new PointerType( Type::Qualifiers(), realType ) ) );
1013	Statement *bodyStmt;
1014
1015	std::list< TypeDecl *>::iterator tyArg = realType->get_forall().begin();
1016	std::list< TypeDecl *>::iterator tyParam = adapterType->get_forall().begin();
1017	std::list< TypeDecl *>::iterator realTyParam = adaptee->get_forall().begin();
1018	for ( ; tyParam != adapterType->get_forall().end(); ++tyArg, ++tyParam, ++realTyParam ) {
1019	assert( tyArg != realType->get_forall().end() );
1020	std::list< DeclarationWithType >::iterator assertArg = (tyArg)->get_assertions().begin();
1021	std::list< DeclarationWithType >::iterator assertParam = (tyParam)->get_assertions().begin();
1022	std::list< DeclarationWithType >::iterator realAssertParam = (realTyParam)->get_assertions().begin();
1023	for ( ; assertParam != (*tyParam)->get_assertions().end(); ++assertArg, ++assertParam, ++realAssertParam ) {
1024	assert( assertArg != (*tyArg)->get_assertions().end() );
1025	adapteeApp->get_args().push_back( makeAdapterArg( assertParam, assertArg, *realAssertParam, tyVars ) );
1026	} // for
1027	} // for
1028
1029	std::list< DeclarationWithType *>::iterator arg = realType->get_parameters().begin();
1030	std::list< DeclarationWithType *>::iterator param = adapterType->get_parameters().begin();
1031	std::list< DeclarationWithType *>::iterator realParam = adaptee->get_parameters().begin();
1032	param++; // skip adaptee parameter in the adapter type
1033	if ( realType->get_returnVals().empty() ) {
1034	// void return
1035	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1036	bodyStmt = new ExprStmt( noLabels, adapteeApp );
1037	// } else if ( isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
1038	} else if ( isDynType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
1039	// return type T
1040	if ( (*param)->get_name() == "" ) {
1041	(*param)->set_name( "_ret" );
1042	(*param)->set_linkage( LinkageSpec::C );
1043	} // if
1044	UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
1045	UntypedExpr deref = new UntypedExpr( new NameExpr( "?" ) );
1046	deref->get_args().push_back( new CastExpr( new VariableExpr( *param++ ), new PointerType( Type::Qualifiers(), realType->get_returnVals().front()->get_type()->clone() ) ) );
1047	assign->get_args().push_back( deref );
1048	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1049	assign->get_args().push_back( adapteeApp );
1050	bodyStmt = new ExprStmt( noLabels, assign );
1051	} else {
1052	// adapter for a function that returns a monomorphic value
1053	addAdapterParams( adapteeApp, arg, param, adapterType->get_parameters().end(), realParam, tyVars );
1054	bodyStmt = new ReturnStmt( noLabels, adapteeApp );
1055	} // if
1056	CompoundStmt *adapterBody = new CompoundStmt( noLabels );
1057	adapterBody->get_kids().push_back( bodyStmt );
1058	std::string adapterName = makeAdapterName( mangleName );
1059	return new FunctionDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, adapterType, adapterBody, false, false );
1060	}
1061
1062	void Pass1::passAdapters( ApplicationExpr * appExpr, FunctionType * functionType, const TyVarMap & exprTyVars ) {
1063	// collect a list of function types passed as parameters or implicit parameters (assertions)
1064	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
1065	std::list< FunctionType *> functions;
1066	for ( std::list< TypeDecl *>::iterator tyVar = functionType->get_forall().begin(); tyVar != functionType->get_forall().end(); ++tyVar ) {
1067	for ( std::list< DeclarationWithType >::iterator assert = (tyVar)->get_assertions().begin(); assert != (*tyVar)->get_assertions().end(); ++assert ) {
1068	findFunction( (*assert)->get_type(), functions, exprTyVars, needsAdapter );
1069	} // for
1070	} // for
1071	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
1072	findFunction( (*arg)->get_type(), functions, exprTyVars, needsAdapter );
1073	} // for
1074
1075	// parameter function types for which an appropriate adapter has been generated. we cannot use the types
1076	// after applying substitutions, since two different parameter types may be unified to the same type
1077	std::set< std::string > adaptersDone;
1078
1079	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
1080	FunctionType originalFunction = (funType)->clone();
1081	FunctionType realFunction = (funType)->clone();
1082	std::string mangleName = SymTab::Mangler::mangle( realFunction );
1083
1084	// only attempt to create an adapter or pass one as a parameter if we haven't already done so for this
1085	// pre-substitution parameter function type.
1086	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
1087	adaptersDone.insert( adaptersDone.begin(), mangleName );
1088
1089	// apply substitution to type variables to figure out what the adapter's type should look like
1090	assert( env );
1091	env->apply( realFunction );
1092	mangleName = SymTab::Mangler::mangle( realFunction );
1093	mangleName += makePolyMonoSuffix( originalFunction, exprTyVars );
1094
1095	typedef ScopedMap< std::string, DeclarationWithType* >::iterator AdapterIter;
1096	AdapterIter adapter = adapters.find( mangleName );
1097	if ( adapter == adapters.end() ) {
1098	// adapter has not been created yet in the current scope, so define it
1099	FunctionDecl newAdapter = makeAdapter( funType, realFunction, mangleName, exprTyVars );
1100	std::pair< AdapterIter, bool > answer = adapters.insert( std::pair< std::string, DeclarationWithType *>( mangleName, newAdapter ) );
1101	adapter = answer.first;
1102	stmtsToAdd.push_back( new DeclStmt( noLabels, newAdapter ) );
1103	} // if
1104	assert( adapter != adapters.end() );
1105
1106	// add the appropriate adapter as a parameter
1107	appExpr->get_args().push_front( new VariableExpr( adapter->second ) );
1108	} // if
1109	} // for
1110	} // passAdapters
1111
1112	Expression makeIncrDecrExpr( ApplicationExpr appExpr, Type *polyType, bool isIncr ) {
1113	NameExpr *opExpr;
1114	if ( isIncr ) {
1115	opExpr = new NameExpr( "?+=?" );
1116	} else {
1117	opExpr = new NameExpr( "?-=?" );
1118	} // if
1119	UntypedExpr *addAssign = new UntypedExpr( opExpr );
1120	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
1121	addAssign->get_args().push_back( address->get_arg() );
1122	} else {
1123	addAssign->get_args().push_back( appExpr->get_args().front() );
1124	} // if
1125	addAssign->get_args().push_back( new NameExpr( sizeofName( mangleType( polyType ) ) ) );
1126	addAssign->get_results().front() = appExpr->get_results().front()->clone();
1127	if ( appExpr->get_env() ) {
1128	addAssign->set_env( appExpr->get_env() );
1129	appExpr->set_env( 0 );
1130	} // if
1131	appExpr->get_args().clear();
1132	delete appExpr;
1133	return addAssign;
1134	}
1135
1136	Expression Pass1::handleIntrinsics( ApplicationExpr appExpr ) {
1137	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( appExpr->get_function() ) ) {
1138	if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic ) {
1139	if ( varExpr->get_var()->get_name() == "?[?]" ) {
1140	assert( ! appExpr->get_results().empty() );
1141	assert( appExpr->get_args().size() == 2 );
1142	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
1143	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
1144	assert( ! baseType1 \|\| ! baseType2 ); // the arguments cannot both be polymorphic pointers
1145	UntypedExpr *ret = 0;
1146	if ( baseType1 \|\| baseType2 ) { // one of the arguments is a polymorphic pointer
1147	ret = new UntypedExpr( new NameExpr( "?+?" ) );
1148	} // if
1149	if ( baseType1 ) {
1150	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1151	multiply->get_args().push_back( appExpr->get_args().back() );
1152	multiply->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1153	ret->get_args().push_back( appExpr->get_args().front() );
1154	ret->get_args().push_back( multiply );
1155	} else if ( baseType2 ) {
1156	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1157	multiply->get_args().push_back( appExpr->get_args().front() );
1158	multiply->get_args().push_back( new SizeofExpr( baseType2->clone() ) );
1159	ret->get_args().push_back( multiply );
1160	ret->get_args().push_back( appExpr->get_args().back() );
1161	} // if
1162	if ( baseType1 \|\| baseType2 ) {
1163	ret->get_results().push_front( appExpr->get_results().front()->clone() );
1164	if ( appExpr->get_env() ) {
1165	ret->set_env( appExpr->get_env() );
1166	appExpr->set_env( 0 );
1167	} // if
1168	appExpr->get_args().clear();
1169	delete appExpr;
1170	return ret;
1171	} // if
1172	} else if ( varExpr->get_var()->get_name() == "*?" ) {
1173	assert( ! appExpr->get_results().empty() );
1174	assert( ! appExpr->get_args().empty() );
1175	if ( isPolyType( appExpr->get_results().front(), scopeTyVars, env ) ) {
1176	Expression *ret = appExpr->get_args().front();
1177	delete ret->get_results().front();
1178	ret->get_results().front() = appExpr->get_results().front()->clone();
1179	if ( appExpr->get_env() ) {
1180	ret->set_env( appExpr->get_env() );
1181	appExpr->set_env( 0 );
1182	} // if
1183	appExpr->get_args().clear();
1184	delete appExpr;
1185	return ret;
1186	} // if
1187	} else if ( varExpr->get_var()->get_name() == "?++" \|\| varExpr->get_var()->get_name() == "?--" ) {
1188	assert( ! appExpr->get_results().empty() );
1189	assert( appExpr->get_args().size() == 1 );
1190	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
1191	Type *tempType = appExpr->get_results().front()->clone();
1192	if ( env ) {
1193	env->apply( tempType );
1194	} // if
1195	ObjectDecl *newObj = makeTemporary( tempType );
1196	VariableExpr *tempExpr = new VariableExpr( newObj );
1197	UntypedExpr *assignExpr = new UntypedExpr( new NameExpr( "?=?" ) );
1198	assignExpr->get_args().push_back( tempExpr->clone() );
1199	if ( AddressExpr address = dynamic_cast< AddressExpr >( appExpr->get_args().front() ) ) {
1200	assignExpr->get_args().push_back( address->get_arg()->clone() );
1201	} else {
1202	assignExpr->get_args().push_back( appExpr->get_args().front()->clone() );
1203	} // if
1204	CommaExpr *firstComma = new CommaExpr( assignExpr, makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "?++" ) );
1205	return new CommaExpr( firstComma, tempExpr );
1206	} // if
1207	} else if ( varExpr->get_var()->get_name() == "++?" \|\| varExpr->get_var()->get_name() == "--?" ) {
1208	assert( ! appExpr->get_results().empty() );
1209	assert( appExpr->get_args().size() == 1 );
1210	if ( Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env ) ) {
1211	return makeIncrDecrExpr( appExpr, baseType, varExpr->get_var()->get_name() == "++?" );
1212	} // if
1213	} else if ( varExpr->get_var()->get_name() == "?+?" \|\| varExpr->get_var()->get_name() == "?-?" ) {
1214	assert( ! appExpr->get_results().empty() );
1215	assert( appExpr->get_args().size() == 2 );
1216	Type *baseType1 = isPolyPtr( appExpr->get_args().front()->get_results().front(), scopeTyVars, env );
1217	Type *baseType2 = isPolyPtr( appExpr->get_args().back()->get_results().front(), scopeTyVars, env );
1218	if ( baseType1 && baseType2 ) {
1219	UntypedExpr *divide = new UntypedExpr( new NameExpr( "?/?" ) );
1220	divide->get_args().push_back( appExpr );
1221	divide->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1222	divide->get_results().push_front( appExpr->get_results().front()->clone() );
1223	if ( appExpr->get_env() ) {
1224	divide->set_env( appExpr->get_env() );
1225	appExpr->set_env( 0 );
1226	} // if
1227	return divide;
1228	} else if ( baseType1 ) {
1229	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1230	multiply->get_args().push_back( appExpr->get_args().back() );
1231	multiply->get_args().push_back( new SizeofExpr( baseType1->clone() ) );
1232	appExpr->get_args().back() = multiply;
1233	} else if ( baseType2 ) {
1234	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1235	multiply->get_args().push_back( appExpr->get_args().front() );
1236	multiply->get_args().push_back( new SizeofExpr( baseType2->clone() ) );
1237	appExpr->get_args().front() = multiply;
1238	} // if
1239	} else if ( varExpr->get_var()->get_name() == "?+=?" \|\| varExpr->get_var()->get_name() == "?-=?" ) {
1240	assert( ! appExpr->get_results().empty() );
1241	assert( appExpr->get_args().size() == 2 );
1242	Type *baseType = isPolyPtr( appExpr->get_results().front(), scopeTyVars, env );
1243	if ( baseType ) {
1244	UntypedExpr multiply = new UntypedExpr( new NameExpr( "??" ) );
1245	multiply->get_args().push_back( appExpr->get_args().back() );
1246	multiply->get_args().push_back( new SizeofExpr( baseType->clone() ) );
1247	appExpr->get_args().back() = multiply;
1248	} // if
1249	} // if
1250	return appExpr;
1251	} // if
1252	} // if
1253	return 0;
1254	}
1255
1256	Expression Pass1::mutate( ApplicationExpr appExpr ) {
1257	// std::cerr << "mutate appExpr: ";
1258	// for ( TyVarMap::iterator i = scopeTyVars.begin(); i != scopeTyVars.end(); ++i ) {
1259	// std::cerr << i->first << " ";
1260	// }
1261	// std::cerr << "\n";
1262	bool oldUseRetval = useRetval;
1263	useRetval = false;
1264	appExpr->get_function()->acceptMutator( *this );
1265	mutateAll( appExpr->get_args(), *this );
1266	useRetval = oldUseRetval;
1267
1268	assert( ! appExpr->get_function()->get_results().empty() );
1269	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
1270	assert( pointer );
1271	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
1272	assert( function );
1273
1274	if ( Expression *newExpr = handleIntrinsics( appExpr ) ) {
1275	return newExpr;
1276	} // if
1277
1278	Expression *ret = appExpr;
1279
1280	std::list< Expression *>::iterator arg = appExpr->get_args().begin();
1281	std::list< Expression *>::iterator paramBegin = appExpr->get_args().begin();
1282
1283	TyVarMap exprTyVars( (TypeDecl::Kind)-1 );
1284	makeTyVarMap( function, exprTyVars );
1285	ReferenceToType *dynRetType = isDynRet( function, exprTyVars );
1286
1287	if ( dynRetType ) {
1288	ret = addDynRetParam( appExpr, function, dynRetType, arg );
1289	} else if ( needsAdapter( function, scopeTyVars ) ) {
1290	// std::cerr << "needs adapter: ";
1291	// printTyVarMap( std::cerr, scopeTyVars );
1292	// std::cerr << *env << std::endl;
1293	// change the application so it calls the adapter rather than the passed function
1294	ret = applyAdapter( appExpr, function, arg, scopeTyVars );
1295	} // if
1296	arg = appExpr->get_args().begin();
1297
1298	passTypeVars( appExpr, dynRetType, arg, exprTyVars );
1299	addInferredParams( appExpr, function, arg, exprTyVars );
1300
1301	arg = paramBegin;
1302
1303	boxParams( appExpr, function, arg, exprTyVars );
1304	passAdapters( appExpr, function, exprTyVars );
1305
1306	return ret;
1307	}
1308
1309	Expression Pass1::mutate( UntypedExpr expr ) {
1310	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
1311	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
1312	if ( name->get_name() == "*?" ) {
1313	Expression *ret = expr->get_args().front();
1314	expr->get_args().clear();
1315	delete expr;
1316	return ret->acceptMutator( *this );
1317	} // if
1318	} // if
1319	} // if
1320	return PolyMutator::mutate( expr );
1321	}
1322
1323	Expression Pass1::mutate( AddressExpr addrExpr ) {
1324	assert( ! addrExpr->get_arg()->get_results().empty() );
1325
1326	bool needs = false;
1327	if ( UntypedExpr expr = dynamic_cast< UntypedExpr >( addrExpr->get_arg() ) ) {
1328	if ( ! expr->get_results().empty() && isPolyType( expr->get_results().front(), scopeTyVars, env ) ) {
1329	if ( NameExpr name = dynamic_cast< NameExpr >( expr->get_function() ) ) {
1330	if ( name->get_name() == "*?" ) {
1331	if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr->get_args().front() ) ) {
1332	assert( ! appExpr->get_function()->get_results().empty() );
1333	PointerType pointer = dynamic_cast< PointerType >( appExpr->get_function()->get_results().front() );
1334	assert( pointer );
1335	FunctionType function = dynamic_cast< FunctionType >( pointer->get_base() );
1336	assert( function );
1337	needs = needsAdapter( function, scopeTyVars );
1338	} // if
1339	} // if
1340	} // if
1341	} // if
1342	} // if
1343	// isPolyType check needs to happen before mutating addrExpr arg, so pull it forward
1344	// out of the if condition.
1345	bool polytype = isPolyType( addrExpr->get_arg()->get_results().front(), scopeTyVars, env );
1346	addrExpr->set_arg( mutateExpression( addrExpr->get_arg() ) );
1347	if ( polytype \|\| needs ) {
1348	Expression *ret = addrExpr->get_arg();
1349	delete ret->get_results().front();
1350	ret->get_results().front() = addrExpr->get_results().front()->clone();
1351	addrExpr->set_arg( 0 );
1352	delete addrExpr;
1353	return ret;
1354	} else {
1355	return addrExpr;
1356	} // if
1357	}
1358
1359	/// Wraps a function declaration in a new pointer-to-function variable expression
1360	VariableExpr wrapFunctionDecl( DeclarationWithType functionDecl ) {
1361	// line below cloned from FixFunction.cc
1362	// xxx - functionObj is never added to a list of declarations...
1363	ObjectDecl *functionObj = new ObjectDecl( functionDecl->get_name(), functionDecl->get_storageClass(), functionDecl->get_linkage(), 0,
1364	new PointerType( Type::Qualifiers(), functionDecl->get_type()->clone() ), 0 );
1365	functionObj->set_mangleName( functionDecl->get_mangleName() );
1366	functionObj->set_scopeLevel( functionDecl->get_scopeLevel() );
1367	return new VariableExpr( functionObj );
1368	}
1369
1370	/// Finds the operation declaration for a given type in one of the two maps
1371	DeclarationWithType* findOpForType( Type formalType, const ScopedMap< std::string, DeclarationWithType >& ops, ResolvExpr::TypeMap< DeclarationWithType >& scopedOps ) {
1372	if ( TypeInstType formalTypeInstType = dynamic_cast< TypeInstType >( formalType ) ) {
1373	ScopedMap< std::string, DeclarationWithType *>::const_iterator opIt = ops.find( formalTypeInstType->get_name() );
1374	return opIt == ops.end() ? 0 : opIt->second;
1375	} else {
1376	return scopedOps.find( formalType );
1377	}
1378	}
1379
1380	/// Adds an assertion parameter to the application expression for the actual assertion declaration valued with the assert op
1381	void addAssertionFor( ApplicationExpr appExpr, DeclarationWithType actualDecl, DeclarationWithType *assertOp ) {
1382	appExpr->get_inferParams()[ actualDecl->get_uniqueId() ]
1383	= ParamEntry( assertOp->get_uniqueId(), assertOp->get_type()->clone(), actualDecl->get_type()->clone(), wrapFunctionDecl( assertOp ) );
1384	}
1385
1386	Statement * Pass1::mutate( ReturnStmt *returnStmt ) {
1387	if ( retval && returnStmt->get_expr() ) {
1388	assert( ! returnStmt->get_expr()->get_results().empty() );
1389	// *** Code Removal *** After introducing a temporary variable for all return expressions, the following code appears superfluous.
1390	// if ( returnStmt->get_expr()->get_results().front()->get_isLvalue() ) {
1391	// by this point, a cast expr on a polymorphic return value is redundant
1392	while ( CastExpr castExpr = dynamic_cast< CastExpr >( returnStmt->get_expr() ) ) {
1393	returnStmt->set_expr( castExpr->get_arg() );
1394	returnStmt->get_expr()->set_env( castExpr->get_env() );
1395	castExpr->set_env( 0 );
1396	castExpr->set_arg( 0 );
1397	delete castExpr;
1398	} //while
1399
1400	// find assignment operator for (polymorphic) return type
1401	ApplicationExpr *assignExpr = 0;
1402	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( retval->get_type() ) ) {
1403	// find assignment operator for type variable
1404	ScopedMap< std::string, DeclarationWithType *>::const_iterator assignIter = assignOps.find( typeInst->get_name() );
1405	if ( assignIter == assignOps.end() ) {
1406	throw SemanticError( "Attempt to return dtype or ftype object in ", returnStmt->get_expr() );
1407	} // if
1408	assignExpr = new ApplicationExpr( new VariableExpr( assignIter->second ) );
1409	} else if ( ReferenceToType refType = dynamic_cast< ReferenceToType >( retval->get_type() ) ) {
1410	// find assignment operator for generic type
1411	DeclarationWithType *functionDecl = scopedAssignOps.find( refType );
1412	if ( ! functionDecl ) {
1413	throw SemanticError( "Attempt to return dtype or ftype generic object in ", returnStmt->get_expr() );
1414	}
1415
1416	// wrap it up in an application expression
1417	assignExpr = new ApplicationExpr( wrapFunctionDecl( functionDecl ) );
1418	assignExpr->set_env( env->clone() );
1419
1420	// find each of its needed secondary assignment operators
1421	std::list< Expression* > &tyParams = refType->get_parameters();
1422	std::list< TypeDecl* > &forallParams = functionDecl->get_type()->get_forall();
1423	std::list< Expression* >::const_iterator tyIt = tyParams.begin();
1424	std::list< TypeDecl* >::const_iterator forallIt = forallParams.begin();
1425	for ( ; tyIt != tyParams.end() && forallIt != forallParams.end(); ++tyIt, ++forallIt ) {
1426	// Add appropriate mapping to assignment expression environment
1427	TypeExpr formalTypeExpr = dynamic_cast< TypeExpr >( *tyIt );
1428	assert( formalTypeExpr && "type parameters must be type expressions" );
1429	Type *formalType = formalTypeExpr->get_type();
1430	assignExpr->get_env()->add( (*forallIt)->get_name(), formalType );
1431
1432	// skip non-otype parameters (ftype/dtype)
1433	if ( (*forallIt)->get_kind() != TypeDecl::Any ) continue;
1434
1435	// find otype operators for formal type
1436	DeclarationWithType *assertAssign = findOpForType( formalType, assignOps, scopedAssignOps );
1437	if ( ! assertAssign ) throw SemanticError( "No assignment operation found for ", formalType );
1438
1439	DeclarationWithType *assertCtor = findOpForType( formalType, ctorOps, scopedCtorOps );
1440	if ( ! assertCtor ) throw SemanticError( "No default constructor found for ", formalType );
1441
1442	DeclarationWithType *assertCopy = findOpForType( formalType, copyOps, scopedCopyOps );
1443	if ( ! assertCopy ) throw SemanticError( "No copy constructor found for ", formalType );
1444
1445	DeclarationWithType *assertDtor = findOpForType( formalType, dtorOps, scopedDtorOps );
1446	if ( ! assertDtor ) throw SemanticError( "No destructor found for ", formalType );
1447
1448	// add inferred parameters for otype operators to assignment expression
1449	// NOTE: Code here assumes that first four assertions are assign op, ctor, copy ctor, dtor, in that order
1450	std::list< DeclarationWithType* > &asserts = (*forallIt)->get_assertions();
1451	assert( asserts.size() >= 4 && "Type param needs otype operator assertions" );
1452
1453	std::list< DeclarationWithType* >::iterator actualIt = asserts.begin();
1454	addAssertionFor( assignExpr, *actualIt, assertAssign );
1455	++actualIt;
1456	addAssertionFor( assignExpr, *actualIt, assertCtor );
1457	++actualIt;
1458	addAssertionFor( assignExpr, *actualIt, assertCopy );
1459	++actualIt;
1460	addAssertionFor( assignExpr, *actualIt, assertDtor );
1461
1462	}
1463	}
1464	assert( assignExpr );
1465
1466	// replace return statement with appropriate assignment to out parameter
1467	Expression *retParm = new NameExpr( retval->get_name() );
1468	retParm->get_results().push_back( new PointerType( Type::Qualifiers(), retval->get_type()->clone() ) );
1469	assignExpr->get_args().push_back( retParm );
1470	assignExpr->get_args().push_back( returnStmt->get_expr() );
1471	stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( assignExpr ) ) );
1472	// } else {
1473	// useRetval = true;
1474	// stmtsToAdd.push_back( new ExprStmt( noLabels, mutateExpression( returnStmt->get_expr() ) ) );
1475	// useRetval = false;
1476	// } // if
1477	returnStmt->set_expr( 0 );
1478	} else {
1479	returnStmt->set_expr( mutateExpression( returnStmt->get_expr() ) );
1480	} // if
1481	return returnStmt;
1482	}
1483
1484	Type * Pass1::mutate( PointerType *pointerType ) {
1485	scopeTyVars.beginScope();
1486	makeTyVarMap( pointerType, scopeTyVars );
1487
1488	Type *ret = Mutator::mutate( pointerType );
1489
1490	scopeTyVars.endScope();
1491	return ret;
1492	}
1493
1494	Type * Pass1::mutate( FunctionType *functionType ) {
1495	scopeTyVars.beginScope();
1496	makeTyVarMap( functionType, scopeTyVars );
1497
1498	Type *ret = Mutator::mutate( functionType );
1499
1500	scopeTyVars.endScope();
1501	return ret;
1502	}
1503
1504	void Pass1::doBeginScope() {
1505	adapters.beginScope();
1506	scopedAssignOps.beginScope();
1507	scopedCtorOps.beginScope();
1508	scopedCopyOps.beginScope();
1509	scopedDtorOps.beginScope();
1510	}
1511
1512	void Pass1::doEndScope() {
1513	adapters.endScope();
1514	scopedAssignOps.endScope();
1515	scopedCtorOps.endScope();
1516	scopedCopyOps.endScope();
1517	scopedDtorOps.endScope();
1518	}
1519
1520	////////////////////////////////////////// Pass2 ////////////////////////////////////////////////////
1521
1522	void Pass2::addAdapters( FunctionType *functionType ) {
1523	std::list< DeclarationWithType *> &paramList = functionType->get_parameters();
1524	std::list< FunctionType *> functions;
1525	for ( std::list< DeclarationWithType *>::iterator arg = paramList.begin(); arg != paramList.end(); ++arg ) {
1526	Type orig = (arg)->get_type();
1527	findAndReplaceFunction( orig, functions, scopeTyVars, needsAdapter );
1528	(*arg)->set_type( orig );
1529	}
1530	std::set< std::string > adaptersDone;
1531	for ( std::list< FunctionType *>::iterator funType = functions.begin(); funType != functions.end(); ++funType ) {
1532	std::string mangleName = mangleAdapterName( *funType, scopeTyVars );
1533	if ( adaptersDone.find( mangleName ) == adaptersDone.end() ) {
1534	std::string adapterName = makeAdapterName( mangleName );
1535	paramList.push_front( new ObjectDecl( adapterName, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new PointerType( Type::Qualifiers(), makeAdapterType( *funType, scopeTyVars ) ), 0 ) );
1536	adaptersDone.insert( adaptersDone.begin(), mangleName );
1537	}
1538	}
1539	// deleteAll( functions );
1540	}
1541
1542	template< typename DeclClass >
1543	DeclClass * Pass2::handleDecl( DeclClass decl, Type type ) {
1544	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
1545
1546	return ret;
1547	}
1548
1549	DeclarationWithType * Pass2::mutate( FunctionDecl *functionDecl ) {
1550	return handleDecl( functionDecl, functionDecl->get_functionType() );
1551	}
1552
1553	ObjectDecl * Pass2::mutate( ObjectDecl *objectDecl ) {
1554	return handleDecl( objectDecl, objectDecl->get_type() );
1555	}
1556
1557	TypeDecl * Pass2::mutate( TypeDecl *typeDecl ) {
1558	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1559	if ( typeDecl->get_base() ) {
1560	return handleDecl( typeDecl, typeDecl->get_base() );
1561	} else {
1562	return Mutator::mutate( typeDecl );
1563	}
1564	}
1565
1566	TypedefDecl * Pass2::mutate( TypedefDecl *typedefDecl ) {
1567	return handleDecl( typedefDecl, typedefDecl->get_base() );
1568	}
1569
1570	Type * Pass2::mutate( PointerType *pointerType ) {
1571	scopeTyVars.beginScope();
1572	makeTyVarMap( pointerType, scopeTyVars );
1573
1574	Type *ret = Mutator::mutate( pointerType );
1575
1576	scopeTyVars.endScope();
1577	return ret;
1578	}
1579
1580	Type Pass2::mutate( FunctionType funcType ) {
1581	scopeTyVars.beginScope();
1582	makeTyVarMap( funcType, scopeTyVars );
1583
1584	// move polymorphic return type to parameter list
1585	if ( isDynRet( funcType ) ) {
1586	DeclarationWithType *ret = funcType->get_returnVals().front();
1587	ret->set_type( new PointerType( Type::Qualifiers(), ret->get_type() ) );
1588	funcType->get_parameters().push_front( ret );
1589	funcType->get_returnVals().pop_front();
1590	}
1591
1592	// add size/align and assertions for type parameters to parameter list
1593	std::list< DeclarationWithType *>::iterator last = funcType->get_parameters().begin();
1594	std::list< DeclarationWithType *> inferredParams;
1595	ObjectDecl newObj( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), 0 );
1596	ObjectDecl newPtr( "", DeclarationNode::NoStorageClass, LinkageSpec::C, 0,
1597	new PointerType( Type::Qualifiers(), new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) ), 0 );
1598	for ( std::list< TypeDecl *>::const_iterator tyParm = funcType->get_forall().begin(); tyParm != funcType->get_forall().end(); ++tyParm ) {
1599	ObjectDecl sizeParm, alignParm;
1600	// add all size and alignment parameters to parameter list
1601	if ( (*tyParm)->get_kind() == TypeDecl::Any ) {
1602	TypeInstType parmType( Type::Qualifiers(), (tyParm)->get_name(), tyParm );
1603	std::string parmName = mangleType( &parmType );
1604
1605	sizeParm = newObj.clone();
1606	sizeParm->set_name( sizeofName( parmName ) );
1607	last = funcType->get_parameters().insert( last, sizeParm );
1608	++last;
1609
1610	alignParm = newObj.clone();
1611	alignParm->set_name( alignofName( parmName ) );
1612	last = funcType->get_parameters().insert( last, alignParm );
1613	++last;
1614	}
1615	// move all assertions into parameter list
1616	for ( std::list< DeclarationWithType >::iterator assert = (tyParm)->get_assertions().begin(); assert != (*tyParm)->get_assertions().end(); ++assert ) {
1617	// assert = (assert)->acceptMutator( *this );
1618	inferredParams.push_back( *assert );
1619	}
1620	(*tyParm)->get_assertions().clear();
1621	}
1622
1623	// add size/align for generic parameter types to parameter list
1624	std::set< std::string > seenTypes; // sizeofName for generic types we've seen
1625	for ( std::list< DeclarationWithType* >::const_iterator fnParm = last; fnParm != funcType->get_parameters().end(); ++fnParm ) {
1626	Type polyType = isPolyType( (fnParm)->get_type(), scopeTyVars );
1627	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
1628	std::string typeName = mangleType( polyType );
1629	if ( seenTypes.count( typeName ) ) continue;
1630
1631	ObjectDecl sizeParm, alignParm, *offsetParm;
1632	sizeParm = newObj.clone();
1633	sizeParm->set_name( sizeofName( typeName ) );
1634	last = funcType->get_parameters().insert( last, sizeParm );
1635	++last;
1636
1637	alignParm = newObj.clone();
1638	alignParm->set_name( alignofName( typeName ) );
1639	last = funcType->get_parameters().insert( last, alignParm );
1640	++last;
1641
1642	if ( StructInstType polyBaseStruct = dynamic_cast< StructInstType >( polyType ) ) {
1643	// NOTE zero-length arrays are illegal in C, so empty structs have no offset array
1644	if ( ! polyBaseStruct->get_baseStruct()->get_members().empty() ) {
1645	offsetParm = newPtr.clone();
1646	offsetParm->set_name( offsetofName( typeName ) );
1647	last = funcType->get_parameters().insert( last, offsetParm );
1648	++last;
1649	}
1650	}
1651
1652	seenTypes.insert( typeName );
1653	}
1654	}
1655
1656	// splice assertion parameters into parameter list
1657	funcType->get_parameters().splice( last, inferredParams );
1658	addAdapters( funcType );
1659	mutateAll( funcType->get_returnVals(), *this );
1660	mutateAll( funcType->get_parameters(), *this );
1661
1662	scopeTyVars.endScope();
1663	return funcType;
1664	}
1665
1666	////////////////////////////////////////// PolyGenericCalculator ////////////////////////////////////////////////////
1667
1668	void PolyGenericCalculator::beginTypeScope( Type *ty ) {
1669	scopeTyVars.beginScope();
1670	makeTyVarMap( ty, scopeTyVars );
1671	}
1672
1673	void PolyGenericCalculator::endTypeScope() {
1674	scopeTyVars.endScope();
1675	}
1676
1677	template< typename DeclClass >
1678	DeclClass * PolyGenericCalculator::handleDecl( DeclClass decl, Type type ) {
1679	beginTypeScope( type );
1680	// knownLayouts.beginScope();
1681	// knownOffsets.beginScope();
1682
1683	DeclClass ret = static_cast< DeclClass >( Parent::mutate( decl ) );
1684
1685	// knownOffsets.endScope();
1686	// knownLayouts.endScope();
1687	endTypeScope();
1688	return ret;
1689	}
1690
1691	ObjectDecl * PolyGenericCalculator::mutate( ObjectDecl *objectDecl ) {
1692	return handleDecl( objectDecl, objectDecl->get_type() );
1693	}
1694
1695	DeclarationWithType * PolyGenericCalculator::mutate( FunctionDecl *functionDecl ) {
1696	knownLayouts.beginScope();
1697	knownOffsets.beginScope();
1698
1699	DeclarationWithType * decl = handleDecl( functionDecl, functionDecl->get_functionType() );
1700	knownOffsets.endScope();
1701	knownLayouts.endScope();
1702	return decl;
1703	}
1704
1705	TypedefDecl * PolyGenericCalculator::mutate( TypedefDecl *typedefDecl ) {
1706	return handleDecl( typedefDecl, typedefDecl->get_base() );
1707	}
1708
1709	TypeDecl * PolyGenericCalculator::mutate( TypeDecl *typeDecl ) {
1710	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
1711	return Parent::mutate( typeDecl );
1712	}
1713
1714	Type * PolyGenericCalculator::mutate( PointerType *pointerType ) {
1715	beginTypeScope( pointerType );
1716
1717	Type *ret = Parent::mutate( pointerType );
1718
1719	endTypeScope();
1720	return ret;
1721	}
1722
1723	Type * PolyGenericCalculator::mutate( FunctionType *funcType ) {
1724	beginTypeScope( funcType );
1725
1726	// make sure that any type information passed into the function is accounted for
1727	for ( std::list< DeclarationWithType* >::const_iterator fnParm = funcType->get_parameters().begin(); fnParm != funcType->get_parameters().end(); ++fnParm ) {
1728	// condition here duplicates that in Pass2::mutate( FunctionType* )
1729	Type polyType = isPolyType( (fnParm)->get_type(), scopeTyVars );
1730	if ( polyType && ! dynamic_cast< TypeInstType* >( polyType ) ) {
1731	knownLayouts.insert( mangleType( polyType ) );
1732	}
1733	}
1734
1735	Type *ret = Parent::mutate( funcType );
1736
1737	endTypeScope();
1738	return ret;
1739	}
1740
1741	Statement PolyGenericCalculator::mutate( DeclStmt declStmt ) {
1742	if ( ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( declStmt->get_decl() ) ) {
1743	if ( findGeneric( objectDecl->get_type() ) ) {
1744	// change initialization of a polymorphic value object
1745	// to allocate storage with alloca
1746	Type *declType = objectDecl->get_type();
1747	UntypedExpr *alloc = new UntypedExpr( new NameExpr( "__builtin_alloca" ) );
1748	alloc->get_args().push_back( new NameExpr( sizeofName( mangleType( declType ) ) ) );
1749
1750	delete objectDecl->get_init();
1751
1752	std::list<Expression*> designators;
1753	objectDecl->set_init( new SingleInit( alloc, designators, false ) ); // not constructed
1754	}
1755	}
1756	return Parent::mutate( declStmt );
1757	}
1758
1759	/// Finds the member in the base list that matches the given declaration; returns its index, or -1 if not present
1760	long findMember( DeclarationWithType memberDecl, std::list< Declaration > &baseDecls ) {
1761	long i = 0;
1762	for(std::list< Declaration* >::const_iterator decl = baseDecls.begin(); decl != baseDecls.end(); ++decl, ++i ) {
1763	if ( memberDecl->get_name() != (*decl)->get_name() ) continue;
1764
1765	if ( DeclarationWithType declWithType = dynamic_cast< DeclarationWithType >( *decl ) ) {
1766	if ( memberDecl->get_mangleName().empty() \|\| declWithType->get_mangleName().empty()
1767	\|\| memberDecl->get_mangleName() == declWithType->get_mangleName() ) return i;
1768	else continue;
1769	} else return i;
1770	}
1771	return -1;
1772	}
1773
1774	/// Returns an index expression into the offset array for a type
1775	Expression makeOffsetIndex( Type objectType, long i ) {
1776	std::stringstream offset_namer;
1777	offset_namer << i;
1778	ConstantExpr *fieldIndex = new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), offset_namer.str() ) );
1779	UntypedExpr *fieldOffset = new UntypedExpr( new NameExpr( "?[?]" ) );
1780	fieldOffset->get_args().push_back( new NameExpr( offsetofName( mangleType( objectType ) ) ) );
1781	fieldOffset->get_args().push_back( fieldIndex );
1782	return fieldOffset;
1783	}
1784
1785	/// Returns an expression dereferenced n times
1786	Expression makeDerefdVar( Expression derefdVar, long n ) {
1787	for ( int i = 1; i < n; ++i ) {
1788	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
1789	derefExpr->get_args().push_back( derefdVar );
1790	// xxx - should set results on derefExpr
1791	derefdVar = derefExpr;
1792	}
1793	return derefdVar;
1794	}
1795
1796	Expression PolyGenericCalculator::mutate( MemberExpr memberExpr ) {
1797	// mutate, exiting early if no longer MemberExpr
1798	Expression *expr = Parent::mutate( memberExpr );
1799	memberExpr = dynamic_cast< MemberExpr* >( expr );
1800	if ( ! memberExpr ) return expr;
1801
1802	// get declaration for base struct, exiting early if not found
1803	int varDepth;
1804	VariableExpr *varExpr = getBaseVar( memberExpr->get_aggregate(), &varDepth );
1805	if ( ! varExpr ) return memberExpr;
1806	ObjectDecl objectDecl = dynamic_cast< ObjectDecl >( varExpr->get_var() );
1807	if ( ! objectDecl ) return memberExpr;
1808
1809	// only mutate member expressions for polymorphic types
1810	int tyDepth;
1811	Type *objectType = hasPolyBase( objectDecl->get_type(), scopeTyVars, &tyDepth );
1812	if ( ! objectType ) return memberExpr;
1813	findGeneric( objectType ); // ensure layout for this type is available
1814
1815	// replace member expression with dynamically-computed layout expression
1816	Expression *newMemberExpr = 0;
1817	if ( StructInstType structType = dynamic_cast< StructInstType >( objectType ) ) {
1818	// look up offset index
1819	long i = findMember( memberExpr->get_member(), structType->get_baseStruct()->get_members() );
1820	if ( i == -1 ) return memberExpr;
1821
1822	// replace member expression with pointer to base plus offset
1823	UntypedExpr *fieldLoc = new UntypedExpr( new NameExpr( "?+?" ) );
1824	fieldLoc->get_args().push_back( makeDerefdVar( varExpr->clone(), varDepth ) );
1825	fieldLoc->get_args().push_back( makeOffsetIndex( objectType, i ) );
1826	newMemberExpr = fieldLoc;
1827	} else if ( dynamic_cast< UnionInstType* >( objectType ) ) {
1828	// union members are all at offset zero, so build appropriately-dereferenced variable
1829	newMemberExpr = makeDerefdVar( varExpr->clone(), varDepth );
1830	} else return memberExpr;
1831	assert( newMemberExpr );
1832
1833	Type *memberType = memberExpr->get_member()->get_type();
1834	if ( ! isPolyType( memberType, scopeTyVars ) ) {
1835	// 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
1836	CastExpr *ptrCastExpr = new CastExpr( newMemberExpr, new PointerType( Type::Qualifiers(), memberType->clone() ) );
1837	UntypedExpr derefExpr = new UntypedExpr( new NameExpr( "?" ) );
1838	derefExpr->get_args().push_back( ptrCastExpr );
1839	newMemberExpr = derefExpr;
1840	}
1841
1842	delete memberExpr;
1843	return newMemberExpr;
1844	}
1845
1846	ObjectDecl PolyGenericCalculator::makeVar( const std::string &name, Type type, Initializer *init ) {
1847	ObjectDecl *newObj = new ObjectDecl( name, DeclarationNode::NoStorageClass, LinkageSpec::C, 0, type, init );
1848	stmtsToAdd.push_back( new DeclStmt( noLabels, newObj ) );
1849	return newObj;
1850	}
1851
1852	void PolyGenericCalculator::addOtypeParamsToLayoutCall( UntypedExpr layoutCall, const std::list< Type > &otypeParams ) {
1853	for ( std::list< Type* >::const_iterator param = otypeParams.begin(); param != otypeParams.end(); ++param ) {
1854	if ( findGeneric( *param ) ) {
1855	// push size/align vars for a generic parameter back
1856	std::string paramName = mangleType( *param );
1857	layoutCall->get_args().push_back( new NameExpr( sizeofName( paramName ) ) );
1858	layoutCall->get_args().push_back( new NameExpr( alignofName( paramName ) ) );
1859	} else {
1860	layoutCall->get_args().push_back( new SizeofExpr( (*param)->clone() ) );
1861	layoutCall->get_args().push_back( new AlignofExpr( (*param)->clone() ) );
1862	}
1863	}
1864	}
1865
1866	/// returns true if any of the otype parameters have a dynamic layout and puts all otype parameters in the output list
1867	bool findGenericParams( std::list< TypeDecl* > &baseParams, std::list< Expression* > &typeParams, std::list< Type* > &out ) {
1868	bool hasDynamicLayout = false;
1869
1870	std::list< TypeDecl* >::const_iterator baseParam = baseParams.begin();
1871	std::list< Expression* >::const_iterator typeParam = typeParams.begin();
1872	for ( ; baseParam != baseParams.end() && typeParam != typeParams.end(); ++baseParam, ++typeParam ) {
1873	// skip non-otype parameters
1874	if ( (*baseParam)->get_kind() != TypeDecl::Any ) continue;
1875	TypeExpr typeExpr = dynamic_cast< TypeExpr >( *typeParam );
1876	assert( typeExpr && "all otype parameters should be type expressions" );
1877
1878	Type *type = typeExpr->get_type();
1879	out.push_back( type );
1880	if ( isPolyType( type ) ) hasDynamicLayout = true;
1881	}
1882	assert( baseParam == baseParams.end() && typeParam == typeParams.end() );
1883
1884	return hasDynamicLayout;
1885	}
1886
1887	bool PolyGenericCalculator::findGeneric( Type *ty ) {
1888	ty = replaceTypeInst( ty, env );
1889
1890	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( ty ) ) {
1891	if ( scopeTyVars.find( typeInst->get_name() ) != scopeTyVars.end() ) {
1892	// NOTE assumes here that getting put in the scopeTyVars included having the layout variables set
1893	return true;
1894	}
1895	return false;
1896	} else if ( StructInstType structTy = dynamic_cast< StructInstType >( ty ) ) {
1897	// check if this type already has a layout generated for it
1898	std::string typeName = mangleType( ty );
1899	if ( knownLayouts.find( typeName ) != knownLayouts.end() ) return true;
1900
1901	// check if any of the type parameters have dynamic layout; if none do, this type is (or will be) monomorphized
1902	std::list< Type* > otypeParams;
1903	if ( ! findGenericParams( *structTy->get_baseParameters(), structTy->get_parameters(), otypeParams ) ) return false;
1904
1905	// insert local variables for layout and generate call to layout function
1906	knownLayouts.insert( typeName ); // done early so as not to interfere with the later addition of parameters to the layout call
1907	Type *layoutType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
1908
1909	int n_members = structTy->get_baseStruct()->get_members().size();
1910	if ( n_members == 0 ) {
1911	// all empty structs have the same layout - size 1, align 1
1912	makeVar( sizeofName( typeName ), layoutType, new SingleInit( new ConstantExpr( Constant::from_ulong( (unsigned long)1 ) ) ) );
1913	makeVar( alignofName( typeName ), layoutType->clone(), new SingleInit( new ConstantExpr( Constant::from_ulong( (unsigned long)1 ) ) ) );
1914	// NOTE zero-length arrays are forbidden in C, so empty structs have no offsetof array
1915	} else {
1916	ObjectDecl *sizeVar = makeVar( sizeofName( typeName ), layoutType );
1917	ObjectDecl *alignVar = makeVar( alignofName( typeName ), layoutType->clone() );
1918	ObjectDecl *offsetVar = makeVar( offsetofName( typeName ), new ArrayType( Type::Qualifiers(), layoutType->clone(), new ConstantExpr( Constant::from_int( n_members ) ), false, false ) );
1919
1920	// generate call to layout function
1921	UntypedExpr *layoutCall = new UntypedExpr( new NameExpr( layoutofName( structTy->get_baseStruct() ) ) );
1922	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( sizeVar ) ) );
1923	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( alignVar ) ) );
1924	layoutCall->get_args().push_back( new VariableExpr( offsetVar ) );
1925	addOtypeParamsToLayoutCall( layoutCall, otypeParams );
1926
1927	stmtsToAdd.push_back( new ExprStmt( noLabels, layoutCall ) );
1928	}
1929
1930	return true;
1931	} else if ( UnionInstType unionTy = dynamic_cast< UnionInstType >( ty ) ) {
1932	// check if this type already has a layout generated for it
1933	std::string typeName = mangleType( ty );
1934	if ( knownLayouts.find( typeName ) != knownLayouts.end() ) return true;
1935
1936	// check if any of the type parameters have dynamic layout; if none do, this type is (or will be) monomorphized
1937	std::list< Type* > otypeParams;
1938	if ( ! findGenericParams( *unionTy->get_baseParameters(), unionTy->get_parameters(), otypeParams ) ) return false;
1939
1940	// insert local variables for layout and generate call to layout function
1941	knownLayouts.insert( typeName ); // done early so as not to interfere with the later addition of parameters to the layout call
1942	Type *layoutType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
1943
1944	ObjectDecl *sizeVar = makeVar( sizeofName( typeName ), layoutType );
1945	ObjectDecl *alignVar = makeVar( alignofName( typeName ), layoutType->clone() );
1946
1947	// generate call to layout function
1948	UntypedExpr *layoutCall = new UntypedExpr( new NameExpr( layoutofName( unionTy->get_baseUnion() ) ) );
1949	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( sizeVar ) ) );
1950	layoutCall->get_args().push_back( new AddressExpr( new VariableExpr( alignVar ) ) );
1951	addOtypeParamsToLayoutCall( layoutCall, otypeParams );
1952
1953	stmtsToAdd.push_back( new ExprStmt( noLabels, layoutCall ) );
1954
1955	return true;
1956	}
1957
1958	return false;
1959	}
1960
1961	Expression PolyGenericCalculator::mutate( SizeofExpr sizeofExpr ) {
1962	Type *ty = sizeofExpr->get_type();
1963	if ( findGeneric( ty ) ) {
1964	Expression *ret = new NameExpr( sizeofName( mangleType( ty ) ) );
1965	delete sizeofExpr;
1966	return ret;
1967	}
1968	return sizeofExpr;
1969	}
1970
1971	Expression PolyGenericCalculator::mutate( AlignofExpr alignofExpr ) {
1972	Type *ty = alignofExpr->get_type();
1973	if ( findGeneric( ty ) ) {
1974	Expression *ret = new NameExpr( alignofName( mangleType( ty ) ) );
1975	delete alignofExpr;
1976	return ret;
1977	}
1978	return alignofExpr;
1979	}
1980
1981	Expression PolyGenericCalculator::mutate( OffsetofExpr offsetofExpr ) {
1982	// mutate, exiting early if no longer OffsetofExpr
1983	Expression *expr = Parent::mutate( offsetofExpr );
1984	offsetofExpr = dynamic_cast< OffsetofExpr* >( expr );
1985	if ( ! offsetofExpr ) return expr;
1986
1987	// only mutate expressions for polymorphic structs/unions
1988	Type *ty = offsetofExpr->get_type();
1989	if ( ! findGeneric( ty ) ) return offsetofExpr;
1990
1991	if ( StructInstType structType = dynamic_cast< StructInstType >( ty ) ) {
1992	// replace offsetof expression by index into offset array
1993	long i = findMember( offsetofExpr->get_member(), structType->get_baseStruct()->get_members() );
1994	if ( i == -1 ) return offsetofExpr;
1995
1996	Expression *offsetInd = makeOffsetIndex( ty, i );
1997	delete offsetofExpr;
1998	return offsetInd;
1999	} else if ( dynamic_cast< UnionInstType* >( ty ) ) {
2000	// all union members are at offset zero
2001	delete offsetofExpr;
2002	return new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), "0" ) );
2003	} else return offsetofExpr;
2004	}
2005
2006	Expression PolyGenericCalculator::mutate( OffsetPackExpr offsetPackExpr ) {
2007	StructInstType *ty = offsetPackExpr->get_type();
2008
2009	Expression *ret = 0;
2010	if ( findGeneric( ty ) ) {
2011	// pull offset back from generated type information
2012	ret = new NameExpr( offsetofName( mangleType( ty ) ) );
2013	} else {
2014	std::string offsetName = offsetofName( mangleType( ty ) );
2015	if ( knownOffsets.find( offsetName ) != knownOffsets.end() ) {
2016	// use the already-generated offsets for this type
2017	ret = new NameExpr( offsetName );
2018	} else {
2019	knownOffsets.insert( offsetName );
2020
2021	std::list< Declaration* > &baseMembers = ty->get_baseStruct()->get_members();
2022	Type *offsetType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
2023
2024	// build initializer list for offset array
2025	std::list< Initializer* > inits;
2026	for ( std::list< Declaration* >::const_iterator member = baseMembers.begin(); member != baseMembers.end(); ++member ) {
2027	DeclarationWithType *memberDecl;
2028	if ( DeclarationWithType origMember = dynamic_cast< DeclarationWithType >( *member ) ) {
2029	memberDecl = origMember->clone();
2030	} else {
2031	memberDecl = new ObjectDecl( (*member)->get_name(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, offsetType->clone(), 0 );
2032	}
2033	inits.push_back( new SingleInit( new OffsetofExpr( ty->clone(), memberDecl ) ) );
2034	}
2035
2036	// build the offset array and replace the pack with a reference to it
2037	ObjectDecl *offsetArray = makeVar( offsetName, new ArrayType( Type::Qualifiers(), offsetType, new ConstantExpr( Constant::from_ulong( baseMembers.size() ) ), false, false ),
2038	new ListInit( inits ) );
2039	ret = new VariableExpr( offsetArray );
2040	}
2041	}
2042
2043	delete offsetPackExpr;
2044	return ret;
2045	}
2046
2047	void PolyGenericCalculator::doBeginScope() {
2048	knownLayouts.beginScope();
2049	knownOffsets.beginScope();
2050	}
2051
2052	void PolyGenericCalculator::doEndScope() {
2053	knownLayouts.endScope();
2054	knownOffsets.endScope();
2055	}
2056
2057	////////////////////////////////////////// Pass3 ////////////////////////////////////////////////////
2058
2059	template< typename DeclClass >
2060	DeclClass * Pass3::handleDecl( DeclClass decl, Type type ) {
2061	scopeTyVars.beginScope();
2062	makeTyVarMap( type, scopeTyVars );
2063
2064	DeclClass ret = static_cast< DeclClass >( Mutator::mutate( decl ) );
2065	ScrubTyVars::scrub( decl, scopeTyVars );
2066
2067	scopeTyVars.endScope();
2068	return ret;
2069	}
2070
2071	ObjectDecl * Pass3::mutate( ObjectDecl *objectDecl ) {
2072	return handleDecl( objectDecl, objectDecl->get_type() );
2073	}
2074
2075	DeclarationWithType * Pass3::mutate( FunctionDecl *functionDecl ) {
2076	return handleDecl( functionDecl, functionDecl->get_functionType() );
2077	}
2078
2079	TypedefDecl * Pass3::mutate( TypedefDecl *typedefDecl ) {
2080	return handleDecl( typedefDecl, typedefDecl->get_base() );
2081	}
2082
2083	TypeDecl * Pass3::mutate( TypeDecl *typeDecl ) {
2084	// Initializer *init = 0;
2085	// std::list< Expression *> designators;
2086	// scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
2087	// if ( typeDecl->get_base() ) {
2088	// init = new SimpleInit( new SizeofExpr( handleDecl( typeDecl, typeDecl->get_base() ) ), designators );
2089	// }
2090	// return new ObjectDecl( typeDecl->get_name(), Declaration::Extern, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::UnsignedInt ), init );
2091
2092	scopeTyVars[ typeDecl->get_name() ] = typeDecl->get_kind();
2093	return Mutator::mutate( typeDecl );
2094	}
2095
2096	Type * Pass3::mutate( PointerType *pointerType ) {
2097	scopeTyVars.beginScope();
2098	makeTyVarMap( pointerType, scopeTyVars );
2099
2100	Type *ret = Mutator::mutate( pointerType );
2101
2102	scopeTyVars.endScope();
2103	return ret;
2104	}
2105
2106	Type * Pass3::mutate( FunctionType *functionType ) {
2107	scopeTyVars.beginScope();
2108	makeTyVarMap( functionType, scopeTyVars );
2109
2110	Type *ret = Mutator::mutate( functionType );
2111
2112	scopeTyVars.endScope();
2113	return ret;
2114	}
2115	} // anonymous namespace
2116	} // namespace GenPoly
2117
2118	// Local Variables: //
2119	// tab-width: 4 //
2120	// mode: c++ //
2121	// compile-command: "make install" //
2122	// End: //

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source: src/GenPoly/Box.cc@ 9f70ab57

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