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source: src/GenPoly/GenPoly.cc @ 1d66a91

Last change on this file since 1d66a91 was c97b448, checked in by Andrew Beach <ajbeach@…>, 21 months ago
Added some box pass utilities that I believe are working and I don't want to look at all the time.
Property mode set to `100644`
File size: 32.5 KB

Rev	Line
[51587aa]	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	//
[540de412]	7	// GenPoly.cc --
[51587aa]	8	//
	9	// Author : Richard C. Bilson
	10	// Created On : Mon May 18 07:44:20 2015
[3606fe4]	11	// Last Modified By : Andrew Beach
[63d1ebe]	12	// Last Modified On : Mon Oct 24 15:19:00 2022
	13	// Update Count : 17
[51587aa]	14	//
[51b7345]	15
	16	#include "GenPoly.h"
[ffad73a]	17
[08fc48f]	18	#include <cassert> // for assertf, assert
	19	#include <iostream> // for operator<<, ostream, basic_os...
	20	#include <iterator> // for back_insert_iterator, back_in...
	21	#include <list> // for list, _List_iterator, list<>:...
	22	#include <typeindex> // for type_index
	23	#include <utility> // for pair
	24	#include <vector> // for vector
	25
[a0d1f1c]	26	#include "AST/Expr.hpp"
[d76c588]	27	#include "AST/Type.hpp"
[a0d1f1c]	28	#include "AST/TypeSubstitution.hpp"
[08fc48f]	29	#include "GenPoly/ErasableScopedMap.h" // for ErasableScopedMap<>::const_it...
	30	#include "ResolvExpr/typeops.h" // for flatten
	31	#include "SynTree/Constant.h" // for Constant
	32	#include "SynTree/Expression.h" // for Expression, TypeExpr, Constan...
	33	#include "SynTree/Type.h" // for Type, StructInstType, UnionIn...
	34	#include "SynTree/TypeSubstitution.h" // for TypeSubstitution
[51b7345]	35
[b1a6d6b]	36	using namespace std;
[51b7345]	37
	38	namespace GenPoly {
[ffad73a]	39	namespace {
[0f889a77]	40	/// Checks a parameter list for polymorphic parameters; will substitute according to env if present
	41	bool hasPolyParams( std::list< Expression* >& params, const TypeSubstitution *env ) {
	42	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
	43	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
[7350ff97]	44	assertf(paramType, "Aggregate parameters should be type expressions");
[0f889a77]	45	if ( isPolyType( paramType->get_type(), env ) ) return true;
	46	}
	47	return false;
	48	}
	49
[490fb92e]	50	bool hasPolyParams( const std::vector<ast::ptr<ast::Expr>> & params, const ast::TypeSubstitution * env) {
	51	for (auto &param : params) {
	52	auto paramType = param.strict_as<ast::TypeExpr>();
	53	if (isPolyType(paramType->type, env)) return true;
	54	}
	55	return false;
	56	}
	57
[0f889a77]	58	/// Checks a parameter list for polymorphic parameters from tyVars; will substitute according to env if present
[ffad73a]	59	bool hasPolyParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
	60	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
	61	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
[5a3ac84]	62	assertf(paramType, "Aggregate parameters should be type expressions");
[ffad73a]	63	if ( isPolyType( paramType->get_type(), tyVars, env ) ) return true;
	64	}
	65	return false;
	66	}
[3bb195cb]	67
	68	/// Checks a parameter list for dynamic-layout parameters from tyVars; will substitute according to env if present
	69	bool hasDynParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
	70	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
	71	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
[5a3ac84]	72	assertf(paramType, "Aggregate parameters should be type expressions");
[3bb195cb]	73	if ( isDynType( paramType->get_type(), tyVars, env ) ) return true;
	74	}
	75	return false;
	76	}
[5a3ac84]	77
[c8837e5]	78	bool hasDynParams(
	79	const std::vector<ast::ptr<ast::Expr>> & params,
	80	const TypeVarMap & typeVars,
	81	const ast::TypeSubstitution * subst ) {
	82	for ( ast::ptr<ast::Expr> const & paramExpr : params ) {
	83	auto param = paramExpr.as<ast::TypeExpr>();
	84	assertf( param, "Aggregate parameters should be type expressions." );
	85	if ( isDynType( param->type.get(), typeVars, subst ) ) {
[3606fe4]	86	return true;
	87	}
	88	}
	89	return false;
	90	}
	91
[5a3ac84]	92	/// Checks a parameter list for inclusion of polymorphic parameters; will substitute according to env if present
	93	bool includesPolyParams( std::list< Expression* >& params, const TypeSubstitution *env ) {
	94	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
	95	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
	96	assertf(paramType, "Aggregate parameters should be type expressions");
	97	if ( includesPolyType( paramType->get_type(), env ) ) return true;
	98	}
	99	return false;
	100	}
	101
	102	/// Checks a parameter list for inclusion of polymorphic parameters from tyVars; will substitute according to env if present
	103	bool includesPolyParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
	104	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
	105	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
	106	assertf(paramType, "Aggregate parameters should be type expressions");
	107	if ( includesPolyType( paramType->get_type(), tyVars, env ) ) return true;
	108	}
	109	return false;
	110	}
[c2ad3c9]	111	}
[83de11e]	112
[c2ad3c9]	113	Type* replaceTypeInst( Type* type, const TypeSubstitution* env ) {
	114	if ( ! env ) return type;
	115	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
	116	Type *newType = env->lookup( typeInst->get_name() );
	117	if ( newType ) return newType;
[e24955a]	118	}
[c2ad3c9]	119	return type;
[ffad73a]	120	}
[0f889a77]	121
[4da152a]	122	const Type* replaceTypeInst( const Type* type, const TypeSubstitution* env ) {
	123	if ( ! env ) return type;
	124	if ( auto typeInst = dynamic_cast< const TypeInstType* >( type ) ) {
	125	Type *newType = env->lookup( typeInst->get_name() );
	126	if ( newType ) return newType;
	127	}
	128	return type;
	129	}
	130
[490fb92e]	131	const ast::Type * replaceTypeInst(const ast::Type * type, const ast::TypeSubstitution * env) {
	132	if (!env) return type;
[75f6a5f]	133	if ( auto typeInst = dynamic_cast<const ast::TypeInstType*>(type) ) {
[3e5dd913]	134	auto newType = env->lookup(typeInst);
[490fb92e]	135	if (newType) return newType;
	136	}
	137	return type;
	138	}
	139
[0f889a77]	140	Type isPolyType( Type type, const TypeSubstitution *env ) {
[e24955a]	141	type = replaceTypeInst( type, env );
[83de11e]	142
[ca35c51]	143	if ( dynamic_cast< TypeInstType * >( type ) ) {
[0f889a77]	144	return type;
[5f61546]	145	} else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {
	146	return isPolyType( arrayType->base, env );
[0f889a77]	147	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
	148	if ( hasPolyParams( structType->get_parameters(), env ) ) return type;
	149	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
	150	if ( hasPolyParams( unionType->get_parameters(), env ) ) return type;
	151	}
	152	return 0;
	153	}
[540de412]	154
[490fb92e]	155	const ast::Type * isPolyType(const ast::Type * type, const ast::TypeSubstitution * env) {
	156	type = replaceTypeInst( type, env );
	157
	158	if ( dynamic_cast< const ast::TypeInstType * >( type ) ) {
	159	return type;
	160	} else if ( auto arrayType = dynamic_cast< const ast::ArrayType * >( type ) ) {
	161	return isPolyType( arrayType->base, env );
	162	} else if ( auto structType = dynamic_cast< const ast::StructInstType* >( type ) ) {
	163	if ( hasPolyParams( structType->params, env ) ) return type;
	164	} else if ( auto unionType = dynamic_cast< const ast::UnionInstType* >( type ) ) {
	165	if ( hasPolyParams( unionType->params, env ) ) return type;
	166	}
	167	return 0;
	168	}
	169
[ffad73a]	170	Type isPolyType( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
[e24955a]	171	type = replaceTypeInst( type, env );
[83de11e]	172
[e56cfdb0]	173	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
[e9b5043]	174	if ( tyVars.contains( typeInst->get_name() ) ) {
[ffad73a]	175	return type;
[0f889a77]	176	}
[5f61546]	177	} else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {
	178	return isPolyType( arrayType->base, tyVars, env );
[ffad73a]	179	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
	180	if ( hasPolyParams( structType->get_parameters(), tyVars, env ) ) return type;
	181	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
	182	if ( hasPolyParams( unionType->get_parameters(), tyVars, env ) ) return type;
	183	}
	184	return 0;
[01aeade]	185	}
[b1a6d6b]	186
[490fb92e]	187	const ast::Type * isPolyType(const ast::Type * type, const TyVarMap & tyVars, const ast::TypeSubstitution * env) {
	188	type = replaceTypeInst( type, env );
	189
	190	if ( auto typeInst = dynamic_cast< const ast::TypeInstType * >( type ) ) {
[e9b5043]	191	if ( tyVars.contains( typeInst->typeString() ) ) return type;
[490fb92e]	192	} else if ( auto arrayType = dynamic_cast< const ast::ArrayType * >( type ) ) {
	193	return isPolyType( arrayType->base, env );
	194	} else if ( auto structType = dynamic_cast< const ast::StructInstType* >( type ) ) {
	195	if ( hasPolyParams( structType->params, env ) ) return type;
	196	} else if ( auto unionType = dynamic_cast< const ast::UnionInstType* >( type ) ) {
	197	if ( hasPolyParams( unionType->params, env ) ) return type;
	198	}
	199	return nullptr;
	200	}
	201
[c8837e5]	202	const ast::Type * isPolyType( const ast::Type * type,
	203	const TypeVarMap & typeVars, const ast::TypeSubstitution * subst ) {
	204	type = replaceTypeInst( type, subst );
	205
	206	if ( auto inst = dynamic_cast< const ast::TypeInstType * >( type ) ) {
[e9b5043]	207	if ( typeVars.contains( *inst ) ) return type;
[c8837e5]	208	} else if ( auto array = dynamic_cast< const ast::ArrayType * >( type ) ) {
	209	return isPolyType( array->base, subst );
	210	} else if ( auto sue = dynamic_cast< const ast::StructInstType * >( type ) ) {
	211	if ( hasPolyParams( sue->params, subst ) ) return type;
	212	} else if ( auto sue = dynamic_cast< const ast::UnionInstType * >( type ) ) {
	213	if ( hasPolyParams( sue->params, subst ) ) return type;
	214	}
	215	return nullptr;
	216	}
	217
[33a7b6d]	218	ReferenceToType isDynType( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
[3bb195cb]	219	type = replaceTypeInst( type, env );
	220
	221	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
	222	auto var = tyVars.find( typeInst->get_name() );
[2c57025]	223	if ( var != tyVars.end() && var->second.isComplete ) {
[33a7b6d]	224	return typeInst;
[3bb195cb]	225	}
	226	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
[33a7b6d]	227	if ( hasDynParams( structType->get_parameters(), tyVars, env ) ) return structType;
[3bb195cb]	228	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
[33a7b6d]	229	if ( hasDynParams( unionType->get_parameters(), tyVars, env ) ) return unionType;
[3bb195cb]	230	}
	231	return 0;
	232	}
	233
[c8837e5]	234	const ast::BaseInstType * isDynType(
	235	const ast::Type * type, const TypeVarMap & typeVars,
	236	const ast::TypeSubstitution * subst ) {
	237	type = replaceTypeInst( type, subst );
	238
	239	if ( auto inst = dynamic_cast<ast::TypeInstType const *>( type ) ) {
[63d1ebe]	240	auto var = typeVars.find( *inst );
[c8837e5]	241	if ( var != typeVars.end() && var->second.isComplete ) {
[75f6a5f]	242	return inst;
[3606fe4]	243	}
[c8837e5]	244	} else if ( auto inst = dynamic_cast<ast::StructInstType const *>( type ) ) {
	245	if ( hasDynParams( inst->params, typeVars, subst ) ) {
	246	return inst;
	247	}
	248	} else if ( auto inst = dynamic_cast<ast::UnionInstType const *>( type ) ) {
	249	if ( hasDynParams( inst->params, typeVars, subst ) ) {
	250	return inst;
	251	}
[3606fe4]	252	}
[c8837e5]	253	return nullptr;
	254	}
[3606fe4]	255
[3bb195cb]	256	ReferenceToType isDynRet( FunctionType function, const TyVarMap &forallTypes ) {
	257	if ( function->get_returnVals().empty() ) return 0;
[8c49c0e]	258
[3bb195cb]	259	return (ReferenceToType*)isDynType( function->get_returnVals().front()->get_type(), forallTypes );
	260	}
	261
[c8837e5]	262	const ast::BaseInstType *isDynRet(
	263	const ast::FunctionType * type, const TypeVarMap & typeVars ) {
	264	if ( type->returns.empty() ) return nullptr;
	265
	266	return isDynType( type->returns.front(), typeVars );
	267	}
	268
[3bb195cb]	269	ReferenceToType isDynRet( FunctionType function ) {
	270	if ( function->get_returnVals().empty() ) return 0;
	271
[2c57025]	272	TyVarMap forallTypes( TypeDecl::Data{} );
[3bb195cb]	273	makeTyVarMap( function, forallTypes );
	274	return (ReferenceToType*)isDynType( function->get_returnVals().front()->get_type(), forallTypes );
	275	}
	276
[c97b448]	277	const ast::BaseInstType isDynRet( const ast::FunctionType func ) {
	278	if ( func->returns.empty() ) return nullptr;
	279
	280	TypeVarMap forallTypes = { ast::TypeData() };
	281	makeTypeVarMap( func, forallTypes );
	282	return isDynType( func->returns.front(), forallTypes );
	283	}
	284
[3bb195cb]	285	bool needsAdapter( FunctionType *adaptee, const TyVarMap &tyVars ) {
	286	// if ( ! adaptee->get_returnVals().empty() && isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
	287	// return true;
	288	// } // if
	289	if ( isDynRet( adaptee, tyVars ) ) return true;
[8c49c0e]	290
[3bb195cb]	291	for ( std::list< DeclarationWithType* >::const_iterator innerArg = adaptee->get_parameters().begin(); innerArg != adaptee->get_parameters().end(); ++innerArg ) {
	292	// if ( isPolyType( (*innerArg)->get_type(), tyVars ) ) {
	293	if ( isDynType( (*innerArg)->get_type(), tyVars ) ) {
	294	return true;
	295	} // if
	296	} // for
	297	return false;
	298	}
	299
[c8837e5]	300	bool needsAdapter(
	301	ast::FunctionType const * adaptee, const TypeVarMap & typeVars ) {
	302	if ( isDynRet( adaptee, typeVars ) ) return true;
	303
	304	for ( auto param : adaptee->params ) {
	305	if ( isDynType( param, typeVars ) ) {
	306	return true;
	307	}
	308	}
	309	return false;
	310	}
	311
[0f889a77]	312	Type isPolyPtr( Type type, const TypeSubstitution *env ) {
[e24955a]	313	type = replaceTypeInst( type, env );
[83de11e]	314
[0f889a77]	315	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
	316	return isPolyType( ptr->get_base(), env );
[e24955a]	317	}
[0f889a77]	318	return 0;
	319	}
[540de412]	320
[ffad73a]	321	Type isPolyPtr( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
[e24955a]	322	type = replaceTypeInst( type, env );
[83de11e]	323
[ffad73a]	324	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
	325	return isPolyType( ptr->get_base(), tyVars, env );
[e24955a]	326	}
[ffad73a]	327	return 0;
[bdf1954]	328	}
	329
[c97b448]	330	const ast::Type * isPolyPtr(
	331	const ast::Type * type, const TypeVarMap & typeVars,
	332	const ast::TypeSubstitution * typeSubs ) {
	333	type = replaceTypeInst( type, typeSubs );
	334
	335	if ( auto * ptr = dynamic_cast<ast::PointerType const *>( type ) ) {
	336	return isPolyType( ptr->base, typeVars, typeSubs );
	337	}
	338	return nullptr;
	339	}
	340
[8488c715]	341	Type * hasPolyBase( Type type, int levels, const TypeSubstitution *env ) {
	342	int dummy;
	343	if ( ! levels ) { levels = &dummy; }
	344	*levels = 0;
	345
	346	while ( true ) {
[e24955a]	347	type = replaceTypeInst( type, env );
[83de11e]	348
[8488c715]	349	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
	350	type = ptr->get_base();
	351	++(*levels);
	352	} else break;
[05d47278]	353	}
	354
	355	return isPolyType( type, env );
	356	}
[540de412]	357
[8488c715]	358	Type * hasPolyBase( Type type, const TyVarMap &tyVars, int levels, const TypeSubstitution *env ) {
	359	int dummy;
	360	if ( ! levels ) { levels = &dummy; }
	361	*levels = 0;
	362
	363	while ( true ) {
[e24955a]	364	type = replaceTypeInst( type, env );
[83de11e]	365
[8488c715]	366	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
	367	type = ptr->get_base();
	368	++(*levels);
	369	} else break;
[05d47278]	370	}
	371
	372	return isPolyType( type, tyVars, env );
	373	}
	374
[c8837e5]	375	ast::Type const * hasPolyBase(
	376	ast::Type const * type, const TypeVarMap & typeVars,
	377	int * levels, const ast::TypeSubstitution * subst ) {
	378	int level_count = 0;
	379
	380	while ( true ) {
	381	type = replaceTypeInst( type, subst );
	382
	383	if ( auto ptr = dynamic_cast<ast::PointerType const *>( type ) ) {
	384	type = ptr->base;
	385	++level_count;
	386	} else {
	387	break;
	388	}
	389	}
	390
	391	if ( nullptr != levels ) { *levels = level_count; }
	392	return isPolyType( type, typeVars, subst );
	393	}
	394
[5a3ac84]	395	bool includesPolyType( Type type, const TypeSubstitution env ) {
	396	type = replaceTypeInst( type, env );
	397
	398	if ( dynamic_cast< TypeInstType * >( type ) ) {
	399	return true;
	400	} else if ( PointerType pointerType = dynamic_cast< PointerType >( type ) ) {
	401	if ( includesPolyType( pointerType->get_base(), env ) ) return true;
	402	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
	403	if ( includesPolyParams( structType->get_parameters(), env ) ) return true;
	404	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
	405	if ( includesPolyParams( unionType->get_parameters(), env ) ) return true;
	406	}
	407	return false;
	408	}
	409
	410	bool includesPolyType( Type type, const TyVarMap &tyVars, const TypeSubstitution env ) {
	411	type = replaceTypeInst( type, env );
	412
	413	if ( TypeInstType typeInstType = dynamic_cast< TypeInstType >( type ) ) {
[e9b5043]	414	if ( tyVars.contains( typeInstType->get_name() ) ) {
[5a3ac84]	415	return true;
	416	}
	417	} else if ( PointerType pointerType = dynamic_cast< PointerType >( type ) ) {
	418	if ( includesPolyType( pointerType->get_base(), tyVars, env ) ) return true;
	419	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
	420	if ( includesPolyParams( structType->get_parameters(), tyVars, env ) ) return true;
	421	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
	422	if ( includesPolyParams( unionType->get_parameters(), tyVars, env ) ) return true;
	423	}
	424	return false;
	425	}
	426
[7754cde]	427	FunctionType * getFunctionType( Type *ty ) {
	428	PointerType *ptrType;
	429	if ( ( ptrType = dynamic_cast< PointerType* >( ty ) ) ) {
	430	return dynamic_cast< FunctionType* >( ptrType->get_base() ); // pointer if FunctionType, NULL otherwise
	431	} else {
	432	return dynamic_cast< FunctionType* >( ty ); // pointer if FunctionType, NULL otherwise
	433	}
	434	}
	435
[d76c588]	436	const ast::FunctionType * getFunctionType( const ast::Type * ty ) {
	437	if ( auto pty = dynamic_cast< const ast::PointerType * >( ty ) ) {
	438	return pty->base.as< ast::FunctionType >();
	439	} else {
	440	return dynamic_cast< const ast::FunctionType * >( ty );
	441	}
	442	}
	443
[8488c715]	444	VariableExpr * getBaseVar( Expression expr, int levels ) {
	445	int dummy;
	446	if ( ! levels ) { levels = &dummy; }
	447	*levels = 0;
	448
	449	while ( true ) {
	450	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( expr ) ) {
	451	return varExpr;
[d9f1b2d]	452	} else if ( MemberExpr memberExpr = dynamic_cast< MemberExpr >( expr ) ) {
	453	expr = memberExpr->get_aggregate();
[8488c715]	454	} else if ( AddressExpr addressExpr = dynamic_cast< AddressExpr >( expr ) ) {
	455	expr = addressExpr->get_arg();
	456	} else if ( UntypedExpr untypedExpr = dynamic_cast< UntypedExpr >( expr ) ) {
	457	// look for compiler-inserted dereference operator
	458	NameExpr fn = dynamic_cast< NameExpr >( untypedExpr->get_function() );
	459	if ( ! fn \|\| fn->get_name() != std::string("*?") ) return 0;
	460	expr = *untypedExpr->begin_args();
[540de412]	461	} else if ( CommaExpr commaExpr = dynamic_cast< CommaExpr >( expr ) ) {
	462	// copy constructors insert comma exprs, look at second argument which contains the variable
	463	expr = commaExpr->get_arg2();
	464	continue;
[1aa4b71]	465	} else if ( ConditionalExpr * condExpr = dynamic_cast< ConditionalExpr * >( expr ) ) {
	466	int lvl1;
	467	int lvl2;
	468	VariableExpr * var1 = getBaseVar( condExpr->get_arg2(), &lvl1 );
	469	VariableExpr * var2 = getBaseVar( condExpr->get_arg3(), &lvl2 );
	470	if ( lvl1 == lvl2 && var1 && var2 && var1->get_var() == var2->get_var() ) {
	471	*levels = lvl1;
	472	return var1;
	473	}
	474	break;
[8488c715]	475	} else break;
	476
	477	++(*levels);
	478	}
	479
	480	return 0;
[05d47278]	481	}
	482
[5a3ac84]	483	namespace {
	484	/// Checks if is a pointer to D
	485	template<typename D, typename B>
	486	bool is( const B* p ) { return type_index{typeid(D)} == type_index{typeid(*p)}; }
	487
	488	/// Converts to a pointer to D without checking for safety
	489	template<typename D, typename B>
	490	inline D* as( B* p ) { return reinterpret_cast<D*>(p); }
	491
[3606fe4]	492	template<typename D, typename B>
	493	inline D const * as( B const * p ) {
	494	return reinterpret_cast<D const *>( p );
	495	}
	496
[5a3ac84]	497	/// Flattens a declaration list
	498	template<typename Output>
	499	void flattenList( list< DeclarationWithType* > src, Output out ) {
	500	for ( DeclarationWithType* decl : src ) {
	501	ResolvExpr::flatten( decl->get_type(), out );
	502	}
	503	}
	504
	505	/// Flattens a list of types
	506	template<typename Output>
	507	void flattenList( list< Type* > src, Output out ) {
	508	for ( Type* ty : src ) {
	509	ResolvExpr::flatten( ty, out );
	510	}
	511	}
	512
[7b5694d]	513	/// Flattens a list of types.
	514	// There is another flattenList in Unify.
[3606fe4]	515	void flattenList( vector<ast::ptr<ast::Type>> const & src,
	516	vector<ast::ptr<ast::Type>> & out ) {
	517	for ( auto const & type : src ) {
	518	ResolvExpr::flatten( type, out );
	519	}
	520	}
	521
[5a3ac84]	522	/// Checks if two lists of parameters are equal up to polymorphic substitution.
	523	bool paramListsPolyCompatible( const list< Expression* >& aparams, const list< Expression* >& bparams ) {
	524	if ( aparams.size() != bparams.size() ) return false;
	525
	526	for ( list< Expression* >::const_iterator at = aparams.begin(), bt = bparams.begin();
	527	at != aparams.end(); ++at, ++bt ) {
	528	TypeExpr aparam = dynamic_cast< TypeExpr >(*at);
	529	assertf(aparam, "Aggregate parameters should be type expressions");
	530	TypeExpr bparam = dynamic_cast< TypeExpr >(*bt);
	531	assertf(bparam, "Aggregate parameters should be type expressions");
	532
[cccc534]	533	// xxx - might need to let VoidType be a wildcard here too; could have some voids
[5a3ac84]	534	// stuffed in for dtype-statics.
	535	// if ( is<VoidType>( aparam->get_type() ) \|\| is<VoidType>( bparam->get_type() ) ) continue;
	536	if ( ! typesPolyCompatible( aparam->get_type(), bparam->get_type() ) ) return false;
	537	}
[cccc534]	538
[5a3ac84]	539	return true;
	540	}
[3606fe4]	541
	542	bool paramListsPolyCompatible(
	543	std::vector<ast::ptr<ast::Expr>> const & lparams,
	544	std::vector<ast::ptr<ast::Expr>> const & rparams ) {
	545	if ( lparams.size() != rparams.size() ) {
	546	return false;
	547	}
	548
	549	for ( auto lparam = lparams.begin(), rparam = rparams.begin() ;
	550	lparam != lparams.end() ; ++lparam, ++rparam ) {
	551	ast::TypeExpr const * lexpr = lparam->as<ast::TypeExpr>();
	552	assertf( lexpr, "Aggregate parameters should be type expressions" );
	553	ast::TypeExpr const * rexpr = rparam->as<ast::TypeExpr>();
	554	assertf( rexpr, "Aggregate parameters should be type expressions" );
	555
	556	// xxx - might need to let VoidType be a wildcard here too; could have some voids
	557	// stuffed in for dtype-statics.
	558	// if ( is<VoidType>( lexpr->type() ) \|\| is<VoidType>( bparam->get_type() ) ) continue;
	559	if ( !typesPolyCompatible( lexpr->type, rexpr->type ) ) {
	560	return false;
	561	}
	562	}
	563
	564	return true;
	565	}
[5a3ac84]	566	}
	567
	568	bool typesPolyCompatible( Type a, Type b ) {
	569	type_index aid{ typeid(*a) };
	570	// polymorphic types always match
	571	if ( aid == type_index{typeid(TypeInstType)} ) return true;
[cccc534]	572
[5a3ac84]	573	type_index bid{ typeid(*b) };
	574	// polymorphic types always match
	575	if ( bid == type_index{typeid(TypeInstType)} ) return true;
[cccc534]	576
[5a3ac84]	577	// can't match otherwise if different types
	578	if ( aid != bid ) return false;
	579
	580	// recurse through type structure (conditions borrowed from Unify.cc)
	581	if ( aid == type_index{typeid(BasicType)} ) {
	582	return as<BasicType>(a)->get_kind() == as<BasicType>(b)->get_kind();
	583	} else if ( aid == type_index{typeid(PointerType)} ) {
	584	PointerType ap = as<PointerType>(a), bp = as<PointerType>(b);
	585
	586	// void pointers should match any other pointer type
	587	return is<VoidType>( ap->get_base() ) \|\| is<VoidType>( bp->get_base() )
	588	\|\| typesPolyCompatible( ap->get_base(), bp->get_base() );
[682dcae]	589	} else if ( aid == type_index{typeid(ReferenceType)} ) {
	590	ReferenceType ap = as<ReferenceType>(a), bp = as<ReferenceType>(b);
	591	return is<VoidType>( ap->get_base() ) \|\| is<VoidType>( bp->get_base() )
	592	\|\| typesPolyCompatible( ap->get_base(), bp->get_base() );
[5a3ac84]	593	} else if ( aid == type_index{typeid(ArrayType)} ) {
	594	ArrayType aa = as<ArrayType>(a), ba = as<ArrayType>(b);
	595
	596	if ( aa->get_isVarLen() ) {
	597	if ( ! ba->get_isVarLen() ) return false;
	598	} else {
	599	if ( ba->get_isVarLen() ) return false;
	600
	601	ConstantExpr ad = dynamic_cast<ConstantExpr>( aa->get_dimension() );
	602	ConstantExpr bd = dynamic_cast<ConstantExpr>( ba->get_dimension() );
[cccc534]	603	if ( ad && bd
[5a3ac84]	604	&& ad->get_constant()->get_value() != bd->get_constant()->get_value() )
	605	return false;
	606	}
	607
	608	return typesPolyCompatible( aa->get_base(), ba->get_base() );
	609	} else if ( aid == type_index{typeid(FunctionType)} ) {
	610	FunctionType af = as<FunctionType>(a), bf = as<FunctionType>(b);
	611
	612	vector<Type*> aparams, bparams;
	613	flattenList( af->get_parameters(), back_inserter( aparams ) );
	614	flattenList( bf->get_parameters(), back_inserter( bparams ) );
	615	if ( aparams.size() != bparams.size() ) return false;
	616
	617	vector<Type*> areturns, breturns;
	618	flattenList( af->get_returnVals(), back_inserter( areturns ) );
	619	flattenList( bf->get_returnVals(), back_inserter( breturns ) );
	620	if ( areturns.size() != breturns.size() ) return false;
	621
	622	for ( unsigned i = 0; i < aparams.size(); ++i ) {
	623	if ( ! typesPolyCompatible( aparams[i], bparams[i] ) ) return false;
	624	}
	625	for ( unsigned i = 0; i < areturns.size(); ++i ) {
	626	if ( ! typesPolyCompatible( areturns[i], breturns[i] ) ) return false;
	627	}
	628	return true;
	629	} else if ( aid == type_index{typeid(StructInstType)} ) {
	630	StructInstType aa = as<StructInstType>(a), ba = as<StructInstType>(b);
	631
	632	if ( aa->get_name() != ba->get_name() ) return false;
	633	return paramListsPolyCompatible( aa->get_parameters(), ba->get_parameters() );
	634	} else if ( aid == type_index{typeid(UnionInstType)} ) {
	635	UnionInstType aa = as<UnionInstType>(a), ba = as<UnionInstType>(b);
	636
	637	if ( aa->get_name() != ba->get_name() ) return false;
	638	return paramListsPolyCompatible( aa->get_parameters(), ba->get_parameters() );
	639	} else if ( aid == type_index{typeid(EnumInstType)} ) {
	640	return as<EnumInstType>(a)->get_name() == as<EnumInstType>(b)->get_name();
	641	} else if ( aid == type_index{typeid(TraitInstType)} ) {
	642	return as<TraitInstType>(a)->get_name() == as<TraitInstType>(b)->get_name();
	643	} else if ( aid == type_index{typeid(TupleType)} ) {
	644	TupleType at = as<TupleType>(a), bt = as<TupleType>(b);
	645
	646	vector<Type*> atypes, btypes;
	647	flattenList( at->get_types(), back_inserter( atypes ) );
	648	flattenList( bt->get_types(), back_inserter( btypes ) );
	649	if ( atypes.size() != btypes.size() ) return false;
	650
	651	for ( unsigned i = 0; i < atypes.size(); ++i ) {
	652	if ( ! typesPolyCompatible( atypes[i], btypes[i] ) ) return false;
	653	}
	654	return true;
	655	} else return true; // VoidType, VarArgsType, ZeroType & OneType just need the same type
	656	}
	657
[3606fe4]	658	bool typesPolyCompatible( ast::Type const * lhs, ast::Type const * rhs ) {
	659	type_index const lid = typeid(*lhs);
	660
	661	// Polymorphic types always match:
	662	if ( type_index(typeid(ast::TypeInstType)) == lid ) return true;
	663
	664	type_index const rid = typeid(*rhs);
	665	if ( type_index(typeid(ast::TypeInstType)) == rid ) return true;
	666
	667	// All other types only match if they are the same type:
	668	if ( lid != rid ) return false;
	669
	670	// So remaining types can be examined case by case.
	671	// Recurse through type structure (conditions borrowed from Unify.cc).
	672
	673	if ( type_index(typeid(ast::BasicType)) == lid ) {
	674	return as<ast::BasicType>(lhs)->kind == as<ast::BasicType>(rhs)->kind;
	675	} else if ( type_index(typeid(ast::PointerType)) == lid ) {
	676	ast::PointerType const * l = as<ast::PointerType>(lhs);
	677	ast::PointerType const * r = as<ast::PointerType>(rhs);
	678
	679	// void pointers should match any other pointer type.
	680	return is<ast::VoidType>( l->base.get() )
	681	\|\| is<ast::VoidType>( r->base.get() )
	682	\|\| typesPolyCompatible( l->base.get(), r->base.get() );
	683	} else if ( type_index(typeid(ast::ReferenceType)) == lid ) {
	684	ast::ReferenceType const * l = as<ast::ReferenceType>(lhs);
	685	ast::ReferenceType const * r = as<ast::ReferenceType>(rhs);
	686
	687	// void references should match any other reference type.
	688	return is<ast::VoidType>( l->base.get() )
	689	\|\| is<ast::VoidType>( r->base.get() )
	690	\|\| typesPolyCompatible( l->base.get(), r->base.get() );
	691	} else if ( type_index(typeid(ast::ArrayType)) == lid ) {
	692	ast::ArrayType const * l = as<ast::ArrayType>(lhs);
	693	ast::ArrayType const * r = as<ast::ArrayType>(rhs);
	694
	695	if ( l->isVarLen ) {
	696	if ( !r->isVarLen ) return false;
	697	} else {
	698	if ( r->isVarLen ) return false;
	699
	700	auto lc = l->dimension.as<ast::ConstantExpr>();
	701	auto rc = r->dimension.as<ast::ConstantExpr>();
	702	if ( lc && rc && lc->intValue() != rc->intValue() ) {
	703	return false;
	704	}
	705	}
	706
	707	return typesPolyCompatible( l->base.get(), r->base.get() );
	708	} else if ( type_index(typeid(ast::FunctionType)) == lid ) {
	709	ast::FunctionType const * l = as<ast::FunctionType>(lhs);
	710	ast::FunctionType const * r = as<ast::FunctionType>(rhs);
	711
	712	std::vector<ast::ptr<ast::Type>> lparams, rparams;
	713	flattenList( l->params, lparams );
	714	flattenList( r->params, rparams );
	715	if ( lparams.size() != rparams.size() ) return false;
	716	for ( unsigned i = 0; i < lparams.size(); ++i ) {
	717	if ( !typesPolyCompatible( lparams[i], rparams[i] ) ) return false;
	718	}
	719
	720	std::vector<ast::ptr<ast::Type>> lrets, rrets;
	721	flattenList( l->returns, lrets );
	722	flattenList( r->returns, rrets );
	723	if ( lrets.size() != rrets.size() ) return false;
	724	for ( unsigned i = 0; i < lrets.size(); ++i ) {
	725	if ( !typesPolyCompatible( lrets[i], rrets[i] ) ) return false;
	726	}
	727	return true;
	728	} else if ( type_index(typeid(ast::StructInstType)) == lid ) {
	729	ast::StructInstType const * l = as<ast::StructInstType>(lhs);
	730	ast::StructInstType const * r = as<ast::StructInstType>(rhs);
	731
	732	if ( l->name != r->name ) return false;
	733	return paramListsPolyCompatible( l->params, r->params );
	734	} else if ( type_index(typeid(ast::UnionInstType)) == lid ) {
	735	ast::UnionInstType const * l = as<ast::UnionInstType>(lhs);
	736	ast::UnionInstType const * r = as<ast::UnionInstType>(rhs);
	737
	738	if ( l->name != r->name ) return false;
	739	return paramListsPolyCompatible( l->params, r->params );
	740	} else if ( type_index(typeid(ast::EnumInstType)) == lid ) {
	741	ast::EnumInstType const * l = as<ast::EnumInstType>(lhs);
	742	ast::EnumInstType const * r = as<ast::EnumInstType>(rhs);
	743
	744	return l->name == r->name;
	745	} else if ( type_index(typeid(ast::TraitInstType)) == lid ) {
	746	ast::TraitInstType const * l = as<ast::TraitInstType>(lhs);
	747	ast::TraitInstType const * r = as<ast::TraitInstType>(rhs);
	748
	749	return l->name == r->name;
	750	} else if ( type_index(typeid(ast::TupleType)) == lid ) {
	751	ast::TupleType const * l = as<ast::TupleType>(lhs);
	752	ast::TupleType const * r = as<ast::TupleType>(rhs);
	753
	754	std::vector<ast::ptr<ast::Type>> ltypes, rtypes;
	755	flattenList( l->types, ( ltypes ) );
	756	flattenList( r->types, ( rtypes ) );
	757	if ( ltypes.size() != rtypes.size() ) return false;
	758
	759	for ( unsigned i = 0 ; i < ltypes.size() ; ++i ) {
	760	if ( !typesPolyCompatible( ltypes[i], rtypes[i] ) ) return false;
	761	}
	762	return true;
	763	// The remaining types (VoidType, VarArgsType, ZeroType & OneType)
	764	// have no variation so will always be equal.
	765	} else {
	766	return true;
	767	}
	768	}
	769
[02fdb8e]	770	bool needsBoxing( Type * param, Type * arg, const TyVarMap &exprTyVars, const TypeSubstitution * env ) {
[ae1b9ea]	771	// is parameter is not polymorphic, don't need to box
	772	if ( ! isPolyType( param, exprTyVars ) ) return false;
	773	Type * newType = arg->clone();
	774	if ( env ) env->apply( newType );
	775	std::unique_ptr<Type> manager( newType );
	776	// if the argument's type is polymorphic, we don't need to box again!
	777	return ! isPolyType( newType );
	778	}
	779
[c8837e5]	780	bool needsBoxing( const ast::Type * param, const ast::Type * arg,
	781	const TypeVarMap & typeVars, const ast::TypeSubstitution * subst ) {
	782	// Don't need to box if the parameter is not polymorphic.
	783	if ( !isPolyType( param, typeVars ) ) return false;
	784
	785	ast::ptr<ast::Type> newType = arg;
	786	if ( subst ) {
	787	int count = subst->apply( newType );
	788	(void)count;
[490fb92e]	789	}
[c8837e5]	790	// Only need to box if the argument is not also polymorphic.
	791	return !isPolyType( newType );
	792	}
[490fb92e]	793
[02fdb8e]	794	bool needsBoxing( Type * param, Type * arg, ApplicationExpr * appExpr, const TypeSubstitution * env ) {
[ae1b9ea]	795	FunctionType * function = getFunctionType( appExpr->function->result );
	796	assertf( function, "ApplicationExpr has non-function type: %s", toString( appExpr->function->result ).c_str() );
	797	TyVarMap exprTyVars( TypeDecl::Data{} );
	798	makeTyVarMap( function, exprTyVars );
	799	return needsBoxing( param, arg, exprTyVars, env );
	800	}
	801
[c8837e5]	802	bool needsBoxing(
	803	const ast::Type * param, const ast::Type * arg,
	804	const ast::ApplicationExpr * expr,
	805	const ast::TypeSubstitution * subst ) {
	806	const ast::FunctionType * function = getFunctionType( expr->func->result );
	807	assertf( function, "ApplicationExpr has non-function type: %s", toString( expr->func->result ).c_str() );
[93c10de]	808	TypeVarMap exprTyVars = { ast::TypeData() };
[c8837e5]	809	makeTypeVarMap( function, exprTyVars );
	810	return needsBoxing( param, arg, exprTyVars, subst );
	811	}
[490fb92e]	812
[2c57025]	813	void addToTyVarMap( TypeDecl * tyVar, TyVarMap &tyVarMap ) {
[7ba1324]	814	tyVarMap.insert( tyVar->name, TypeDecl::Data{ tyVar } );
[2c57025]	815	}
	816
[c97b448]	817	void addToTypeVarMap( const ast::TypeDecl * decl, TypeVarMap & typeVars ) {
	818	typeVars.insert( ast::TypeEnvKey( decl, 0, 0 ), ast::TypeData( decl ) );
	819	}
	820
[c8837e5]	821	void addToTypeVarMap( const ast::TypeInstType * type, TypeVarMap & typeVars ) {
[c97b448]	822	typeVars.insert( ast::TypeEnvKey( *type ), ast::TypeData( type->base ) );
[c8837e5]	823	}
[490fb92e]	824
[aadc9a4]	825	void makeTyVarMap( Type *type, TyVarMap &tyVarMap ) {
[8c49c0e]	826	for ( Type::ForallList::const_iterator tyVar = type->get_forall().begin(); tyVar != type->get_forall().end(); ++tyVar ) {
[aadc9a4]	827	assert( *tyVar );
[2c57025]	828	addToTyVarMap( *tyVar, tyVarMap );
[aadc9a4]	829	}
	830	if ( PointerType pointer = dynamic_cast< PointerType >( type ) ) {
	831	makeTyVarMap( pointer->get_base(), tyVarMap );
	832	}
	833	}
[540de412]	834
[c8837e5]	835	void makeTypeVarMap( const ast::Type * type, TypeVarMap & typeVars ) {
	836	if ( auto func = dynamic_cast<ast::FunctionType const *>( type ) ) {
	837	for ( auto & typeVar : func->forall ) {
	838	assert( typeVar );
	839	addToTypeVarMap( typeVar, typeVars );
[490fb92e]	840	}
	841	}
[c8837e5]	842	if ( auto pointer = dynamic_cast<ast::PointerType const *>( type ) ) {
	843	makeTypeVarMap( pointer->base, typeVars );
	844	}
	845	}
[490fb92e]	846
[c97b448]	847	void makeTypeVarMap( const ast::FunctionDecl * decl, TypeVarMap & typeVars ) {
	848	for ( auto & typeDecl : decl->type_params ) {
	849	addToTypeVarMap( typeDecl, typeVars );
	850	}
	851	}
	852
[01aeade]	853	void printTyVarMap( std::ostream &os, const TyVarMap &tyVarMap ) {
	854	for ( TyVarMap::const_iterator i = tyVarMap.begin(); i != tyVarMap.end(); ++i ) {
	855	os << i->first << " (" << i->second << ") ";
	856	} // for
	857	os << std::endl;
	858	}
[ffad73a]	859
[51b7345]	860	} // namespace GenPoly
[01aeade]	861
[51587aa]	862	// Local Variables: //
	863	// tab-width: 4 //
	864	// mode: c++ //
	865	// compile-command: "make install" //
	866	// End: //

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