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source: src/ResolvExpr/ConversionCost.cc @ 6926a6d

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

Last change on this file since 6926a6d was 98278b3a, checked in by Rob Schluntz <rschlunt@…>, 7 years ago
Remove conversion from pointer type to zero_t
Property mode set to `100644`
File size: 18.2 KB

Rev	Line
[a32b204]	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	//
[a436947]	7	// ConversionCost.cc --
[a32b204]	8	//
	9	// Author : Richard C. Bilson
	10	// Created On : Sun May 17 07:06:19 2015
	11	// Last Modified By : Peter A. Buhr
[201aeb9]	12	// Last Modified On : Mon Sep 25 15:43:34 2017
	13	// Update Count : 10
[a32b204]	14	//
[51b7345]	15
	16	#include "ConversionCost.h"
[ea6332d]	17
	18	#include <cassert> // for assert
	19	#include <list> // for list, list<>::const_iterator
	20	#include <string> // for operator==, string
	21
	22	#include "ResolvExpr/Cost.h" // for Cost
	23	#include "ResolvExpr/TypeEnvironment.h" // for EqvClass, TypeEnvironment
	24	#include "SymTab/Indexer.h" // for Indexer
	25	#include "SynTree/Declaration.h" // for TypeDecl, NamedTypeDecl
	26	#include "SynTree/Type.h" // for Type, BasicType, TypeInstType
	27	#include "typeops.h" // for typesCompatibleIgnoreQualifiers
[51b7345]	28
	29	namespace ResolvExpr {
[b0837e4]	30	const Cost Cost::zero = Cost( 0, 0, 0, 0 );
	31	const Cost Cost::infinity = Cost( -1, -1, -1, -1 );
	32	const Cost Cost::unsafe = Cost( 1, 0, 0, 0 );
	33	const Cost Cost::poly = Cost( 0, 1, 0, 0 );
	34	const Cost Cost::safe = Cost( 0, 0, 1, 0 );
	35	const Cost Cost::reference = Cost( 0, 0, 0, 1 );
[b46e3bd]	36
[5ccb10d]	37	#if 0
	38	#define PRINT(x) x
	39	#else
	40	#define PRINT(x)
	41	#endif
[a32b204]	42	Cost conversionCost( Type src, Type dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ) {
	43	if ( TypeInstType destAsTypeInst = dynamic_cast< TypeInstType >( dest ) ) {
	44	EqvClass eqvClass;
	45	NamedTypeDecl *namedType;
[eb0aedb]	46	PRINT( std::cerr << "type inst " << destAsTypeInst->name; )
	47	if ( env.lookup( destAsTypeInst->name, eqvClass ) ) {
[0b150ec]	48	if ( eqvClass.type ) {
	49	return conversionCost( src, eqvClass.type, indexer, env );
	50	} else {
	51	return Cost::infinity;
	52	}
[eb0aedb]	53	} else if ( ( namedType = indexer.lookupType( destAsTypeInst->name ) ) ) {
[5ccb10d]	54	PRINT( std::cerr << " found" << std::endl; )
[a32b204]	55	TypeDecl type = dynamic_cast< TypeDecl >( namedType );
	56	// all typedefs should be gone by this point
	57	assert( type );
[eb0aedb]	58	if ( type->base ) {
	59	return conversionCost( src, type->base, indexer, env ) + Cost::safe;
[a32b204]	60	} // if
	61	} // if
[5ccb10d]	62	PRINT( std::cerr << " not found" << std::endl; )
[a32b204]	63	} // if
[5ccb10d]	64	PRINT(
	65	std::cerr << "src is ";
	66	src->print( std::cerr );
	67	std::cerr << std::endl << "dest is ";
	68	dest->print( std::cerr );
	69	std::cerr << std::endl << "env is" << std::endl;
	70	env.print( std::cerr, 8 );
	71	)
[a32b204]	72	if ( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) {
[5ccb10d]	73	PRINT( std::cerr << "compatible!" << std::endl; )
[89be1c68]	74	return Cost::zero;
[a32b204]	75	} else if ( dynamic_cast< VoidType* >( dest ) ) {
[89be1c68]	76	return Cost::safe;
[2463d0e]	77	} else if ( ReferenceType * refType = dynamic_cast< ReferenceType * > ( dest ) ) {
[5ccb10d]	78	PRINT( std::cerr << "conversionCost: dest is reference" << std::endl; )
[721cd19f]	79	return convertToReferenceCost( src, refType, indexer, env, [](Type * t1, Type * t2, const SymTab::Indexer &, const TypeEnvironment & env ){
[0c6596f]	80	return ptrsAssignable( t1, t2, env );
	81	});
[a32b204]	82	} else {
[bd0b6b62]	83	PassVisitor<ConversionCost> converter( dest, indexer, env, conversionCost );
[a32b204]	84	src->accept( converter );
[bd0b6b62]	85	if ( converter.pass.get_cost() == Cost::infinity ) {
[a32b204]	86	return Cost::infinity;
	87	} else {
[bd0b6b62]	88	return converter.pass.get_cost() + Cost::zero;
[a32b204]	89	} // if
	90	} // if
	91	}
	92
[0c6596f]	93	Cost convertToReferenceCost( Type * src, Type * dest, int diff, const SymTab::Indexer & indexer, const TypeEnvironment & env, PtrsFunction func ) {
[6e027d6]	94	PRINT( std::cerr << "convert to reference cost... diff " << diff << " " << src << " / " << dest << std::endl; )
[89be1c68]	95	if ( diff > 0 ) {
	96	// TODO: document this
[eb0aedb]	97	Cost cost = convertToReferenceCost( strict_dynamic_cast< ReferenceType * >( src )->base, dest, diff-1, indexer, env, func );
[7ebaa56]	98	cost.incReference();
[89be1c68]	99	return cost;
	100	} else if ( diff < -1 ) {
	101	// TODO: document this
[eb0aedb]	102	Cost cost = convertToReferenceCost( src, strict_dynamic_cast< ReferenceType * >( dest )->base, diff+1, indexer, env, func );
[7ebaa56]	103	cost.incReference();
[89be1c68]	104	return cost;
	105	} else if ( diff == 0 ) {
	106	ReferenceType * srcAsRef = dynamic_cast< ReferenceType * >( src );
	107	ReferenceType * destAsRef = dynamic_cast< ReferenceType * >( dest );
	108	if ( srcAsRef && destAsRef ) { // pointer-like conversions between references
[5ccb10d]	109	PRINT( std::cerr << "converting between references" << std::endl; )
[eb0aedb]	110	Type::Qualifiers tq1 = srcAsRef->base->get_qualifiers();
	111	Type::Qualifiers tq2 = destAsRef->base->get_qualifiers();
	112	if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( srcAsRef->base, destAsRef->base, indexer, env ) ) {
[6e027d6]	113	PRINT( std::cerr << " :: compatible and good qualifiers" << std::endl; )
	114	if ( tq1 == tq2 ) {
	115	// types are the same
	116	return Cost::zero;
	117	} else {
	118	// types are the same, except otherPointer has more qualifiers
	119	return Cost::safe;
	120	}
[89be1c68]	121	} else { // xxx - this discards reference qualifiers from consideration -- reducing qualifiers is a safe conversion; is this right?
[721cd19f]	122	int assignResult = func( srcAsRef->base, destAsRef->base, indexer, env );
[5ccb10d]	123	PRINT( std::cerr << "comparing references: " << assignResult << " " << srcAsRef << " " << destAsRef << std::endl; )
[b0837e4]	124	if ( assignResult > 0 ) {
[89be1c68]	125	return Cost::safe;
[b0837e4]	126	} else if ( assignResult < 0 ) {
[89be1c68]	127	return Cost::unsafe;
	128	} // if
[2463d0e]	129	} // if
	130	} else {
[5ccb10d]	131	PRINT( std::cerr << "reference to rvalue conversion" << std::endl; )
[bd0b6b62]	132	PassVisitor<ConversionCost> converter( dest, indexer, env, conversionCost );
[89be1c68]	133	src->accept( converter );
[bd0b6b62]	134	return converter.pass.get_cost();
[89be1c68]	135	} // if
[2463d0e]	136	} else {
[89be1c68]	137	ReferenceType * destAsRef = dynamic_cast< ReferenceType * >( dest );
	138	assert( diff == -1 && destAsRef );
[108f3cdb]	139	PRINT( std::cerr << "dest is: " << dest << " / src is: " << src << std::endl; )
[eb0aedb]	140	if ( typesCompatibleIgnoreQualifiers( src, destAsRef->base, indexer, env ) ) {
[5ccb10d]	141	PRINT( std::cerr << "converting compatible base type" << std::endl; )
[89be1c68]	142	if ( src->get_lvalue() ) {
[5ccb10d]	143	PRINT(
	144	std::cerr << "lvalue to reference conversion" << std::endl;
	145	std::cerr << src << " => " << destAsRef << std::endl;
	146	)
[89be1c68]	147	// lvalue-to-reference conversion: cv lvalue T => cv T &
[eb0aedb]	148	if ( src->get_qualifiers() == destAsRef->base->get_qualifiers() ) {
[7ebaa56]	149	return Cost::reference; // cost needs to be non-zero to add cast
[eb0aedb]	150	} if ( src->get_qualifiers() < destAsRef->base->get_qualifiers() ) {
[7ebaa56]	151	return Cost::safe; // cost needs to be higher than previous cast to differentiate adding qualifiers vs. keeping same
[89be1c68]	152	} else {
	153	return Cost::unsafe;
	154	} // if
[eb0aedb]	155	} else if ( destAsRef->base->get_const() ) {
[5ccb10d]	156	PRINT( std::cerr << "rvalue to const ref conversion" << std::endl; )
[89be1c68]	157	// rvalue-to-const-reference conversion: T => const T &
	158	return Cost::safe;
	159	} else {
[5ccb10d]	160	PRINT( std::cerr << "rvalue to non-const reference conversion" << std::endl; )
[89be1c68]	161	// rvalue-to-reference conversion: T => T &
	162	return Cost::unsafe;
	163	} // if
	164	} // if
[5ccb10d]	165	PRINT( std::cerr << "attempting to convert from incompatible base type -- fail" << std::endl; )
[2463d0e]	166	}
	167	return Cost::infinity;
	168	}
	169
[0c6596f]	170	Cost convertToReferenceCost( Type * src, ReferenceType * dest, const SymTab::Indexer & indexer, const TypeEnvironment & env, PtrsFunction func ) {
[89be1c68]	171	int sdepth = src->referenceDepth(), ddepth = dest->referenceDepth();
[eddb399]	172	Cost cost = convertToReferenceCost( src, dest, sdepth-ddepth, indexer, env, func );
	173	PRINT( std::cerr << "convertToReferenceCost result: " << cost << std::endl; )
	174	return cost;
[89be1c68]	175	}
	176
[721cd19f]	177	ConversionCost::ConversionCost( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env, CostFunction costFunc )
	178	: dest( dest ), indexer( indexer ), cost( Cost::infinity ), env( env ), costFunc( costFunc ) {
[a32b204]	179	}
[51b7345]	180
	181	/*
[a32b204]	182	Old
	183	===
	184	Double
	185	\|
	186	Float
	187	\|
	188	ULong
	189	/ \
	190	UInt Long
	191	\ /
	192	Int
	193	\|
	194	Ushort
	195	\|
	196	Short
	197	\|
	198	Uchar
	199	/ \
	200	Schar Char
	201
	202	New
	203	===
	204	+-----LongDoubleComplex--+
	205	LongDouble--+ \| +-LongDoubleImag
	206	\| +---DoubleComplex---+ \|
	207	Double------+ \| +----DoubleImag
	208	\| +-FloatComplex-+ \|
	209	Float---------+ +-------FloatImag
	210	\|
	211	ULongLong
	212	\|
	213	LongLong
	214	\|
	215	ULong
	216	/ \
	217	UInt Long
	218	\ /
	219	Int
	220	\|
	221	Ushort
	222	\|
	223	Short
	224	\|
	225	Uchar
	226	/ \
	227	Schar Char
	228	\ /
	229	Bool
[51b7345]	230	*/
	231
[201aeb9]	232	static const int costMatrix[ BasicType::NUMBER_OF_BASIC_TYPES ][ BasicType::NUMBER_OF_BASIC_TYPES ] = {
	233	/* Src \ Dest: Bool Char SChar UChar Short UShort Int UInt Long ULong LLong ULLong Float Double LDbl FCplex DCplex LDCplex FImag DImag LDImag I128, U128 */
	234	/* Bool */ { 0, 1, 1, 2, 3, 4, 5, 6, 6, 7, 8, 9, 12, 13, 14, 12, 13, 14, -1, -1, -1, 10, 11, },
	235	/* Char */ { -1, 0, -1, 1, 2, 3, 4, 5, 5, 6, 7, 8, 11, 12, 13, 11, 12, 13, -1, -1, -1, 9, 10, },
	236	/* SChar */ { -1, -1, 0, 1, 2, 3, 4, 5, 5, 6, 7, 8, 11, 12, 13, 11, 12, 13, -1, -1, -1, 9, 10, },
	237	/* UChar */ { -1, -1, -1, 0, 1, 2, 3, 4, 4, 5, 6, 7, 10, 11, 12, 10, 11, 12, -1, -1, -1, 8, 9, },
	238	/* Short */ { -1, -1, -1, -1, 0, 1, 2, 3, 3, 4, 5, 6, 9, 10, 11, 9, 10, 11, -1, -1, -1, 7, 8, },
	239	/* UShort */{ -1, -1, -1, -1, -1, 0, 1, 2, 2, 3, 4, 5, 8, 9, 10, 8, 9, 10, -1, -1, -1, 6, 7, },
	240	/* Int */ { -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 3, 4, 7, 8, 9, 7, 8, 9, -1, -1, -1, 5, 6, },
	241	/* UInt */ { -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, 2, 3, 6, 7, 8, 6, 7, 8, -1, -1, -1, 4, 5, },
	242	/* Long */ { -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 6, 7, 8, 6, 7, 8, -1, -1, -1, 4, 5, },
	243	/* ULong */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 5, 6, 7, 5, 6, 7, -1, -1, -1, 3, 4, },
	244	/* LLong */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 4, 5, 6, 4, 5, 6, -1, -1, -1, 2, 3, },
	245	/* ULLong */{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 3, 4, 5, 3, 4, 5, -1, -1, -1, 1, 2, },
	246
	247	/* Float */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 1, 2, 3, -1, -1, -1, -1, -1, },
	248	/* Double */{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, -1, 1, 2, -1, -1, -1, -1, -1, },
	249	/* LDbl */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, 1, -1, -1, -1, -1, -1, },
	250	/* FCplex */{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, -1, -1, -1, -1, },
	251	/* DCplex */{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, -1, -1, -1, -1, -1, },
	252	/* LDCplex */{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, },
	253	/* FImag */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 3, 0, 1, 2, -1, -1, },
	254	/* DImag */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, -1, 0, 1, -1, -1, },
	255	/* LDImag */{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, 0, -1, -1, },
	256
	257	/* I128 */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 2, 3, 4, 3, 4, 5, -1, -1, -1, 0, 1, },
	258	/* U128 */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 3, 2, 3, 4, -1, -1, -1, -1, 0, },
[a32b204]	259	};
	260
[bd0b6b62]	261	void ConversionCost::postvisit( VoidType * ) {
[a32b204]	262	cost = Cost::infinity;
	263	}
	264
[bd0b6b62]	265	void ConversionCost::postvisit(BasicType *basicType) {
[a32b204]	266	if ( BasicType destAsBasic = dynamic_cast< BasicType >( dest ) ) {
	267	int tableResult = costMatrix[ basicType->get_kind() ][ destAsBasic->get_kind() ];
	268	if ( tableResult == -1 ) {
[89be1c68]	269	cost = Cost::unsafe;
[a32b204]	270	} else {
[89be1c68]	271	cost = Cost::zero;
	272	cost.incSafe( tableResult );
[a32b204]	273	} // if
[a436947]	274	} else if ( dynamic_cast< EnumInstType *>( dest ) ) {
	275	// xxx - not positive this is correct, but appears to allow casting int => enum
[89be1c68]	276	cost = Cost::unsafe;
[89e6ffc]	277	} // if
[98278b3a]	278	// no cases for zero_t/one_t because it should not be possible to convert int, etc. to zero_t/one_t.
[a32b204]	279	}
	280
[bd0b6b62]	281	void ConversionCost::postvisit( PointerType * pointerType ) {
[a32b204]	282	if ( PointerType destAsPtr = dynamic_cast< PointerType >( dest ) ) {
[6e027d6]	283	PRINT( std::cerr << pointerType << " ===> " << destAsPtr << std::endl; )
[eb0aedb]	284	Type::Qualifiers tq1 = pointerType->base->get_qualifiers();
	285	Type::Qualifiers tq2 = destAsPtr->base->get_qualifiers();
	286	if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( pointerType->base, destAsPtr->base, indexer, env ) ) {
[6e027d6]	287	PRINT( std::cerr << " :: compatible and good qualifiers" << std::endl; )
[cb43451]	288	if ( tq1 == tq2 ) {
	289	// types are the same
	290	cost = Cost::zero;
	291	} else {
	292	// types are the same, except otherPointer has more qualifiers
	293	cost = Cost::safe;
	294	}
[b8b075cd]	295	} else {
[b0837e4]	296	int assignResult = ptrsAssignable( pointerType->base, destAsPtr->base, env );
[5ccb10d]	297	PRINT( std::cerr << " :: " << assignResult << std::endl; )
[b8b075cd]	298	if ( assignResult > 0 && tq1 <= tq2 ) {
	299	// xxx - want the case where qualifiers are added to be more expensive than the case where qualifiers are the same. Is 1 safe vs. 2 safe correct?
	300	if ( tq1 == tq2 ) {
	301	cost = Cost::safe;
	302	} else if ( tq1 < tq2 ) {
	303	cost = Cost::safe+Cost::safe;
	304	}
[b0837e4]	305	} else if ( assignResult < 0 ) {
[89be1c68]	306	cost = Cost::unsafe;
[a32b204]	307	} // if
[cb43451]	308	// assignResult == 0 means Cost::Infinity
[a32b204]	309	} // if
[98278b3a]	310	// case case for zero_t because it should not be possible to convert pointers to zero_t.
[a32b204]	311	} // if
	312	}
	313
[bd0b6b62]	314	void ConversionCost::postvisit( ArrayType * ) {}
[2463d0e]	315
[bd0b6b62]	316	void ConversionCost::postvisit( ReferenceType * refType ) {
[2463d0e]	317	// Note: dest can never be a reference, since it would have been caught in an earlier check
	318	assert( ! dynamic_cast< ReferenceType * >( dest ) );
	319	// convert reference to rvalue: cv T1 & => T2
	320	// recursively compute conversion cost from T1 to T2.
	321	// cv can be safely dropped because of 'implicit dereference' behavior.
[721cd19f]	322	cost = costFunc( refType->base, dest, indexer, env );
[150ec33]	323	if ( refType->base->get_qualifiers() == dest->get_qualifiers() ) {
[cb43451]	324	cost.incReference(); // prefer exact qualifiers
[150ec33]	325	} else if ( refType->base->get_qualifiers() < dest->get_qualifiers() ) {
[cb43451]	326	cost.incSafe(); // then gaining qualifiers
	327	} else {
	328	cost.incUnsafe(); // lose qualifiers as last resort
	329	}
[5ccb10d]	330	PRINT( std::cerr << refType << " ==> " << dest << " " << cost << std::endl; )
[2463d0e]	331	}
	332
[bd0b6b62]	333	void ConversionCost::postvisit( FunctionType * ) {}
[a32b204]	334
[bd0b6b62]	335	void ConversionCost::postvisit( StructInstType * inst ) {
[a32b204]	336	if ( StructInstType destAsInst = dynamic_cast< StructInstType >( dest ) ) {
[150ec33]	337	if ( inst->name == destAsInst->name ) {
[a32b204]	338	cost = Cost::zero;
	339	} // if
	340	} // if
	341	}
	342
[bd0b6b62]	343	void ConversionCost::postvisit( UnionInstType * inst ) {
[150ec33]	344	if ( UnionInstType destAsInst = dynamic_cast< UnionInstType >( dest ) ) {
	345	if ( inst->name == destAsInst->name ) {
[a32b204]	346	cost = Cost::zero;
	347	} // if
	348	} // if
	349	}
	350
[bd0b6b62]	351	void ConversionCost::postvisit( EnumInstType * ) {
[a32b204]	352	static Type::Qualifiers q;
	353	static BasicType integer( q, BasicType::SignedInt );
[721cd19f]	354	cost = costFunc( &integer, dest, indexer, env ); // safe if dest >= int
[89be1c68]	355	if ( cost < Cost::unsafe ) {
[a32b204]	356	cost.incSafe();
	357	} // if
	358	}
	359
[bd0b6b62]	360	void ConversionCost::postvisit( TraitInstType * ) {}
[a32b204]	361
[bd0b6b62]	362	void ConversionCost::postvisit( TypeInstType *inst ) {
[a32b204]	363	EqvClass eqvClass;
	364	NamedTypeDecl *namedType;
[eb0aedb]	365	if ( env.lookup( inst->name, eqvClass ) ) {
[721cd19f]	366	cost = costFunc( eqvClass.type, dest, indexer, env );
[a32b204]	367	} else if ( TypeInstType destAsInst = dynamic_cast< TypeInstType >( dest ) ) {
[eb0aedb]	368	if ( inst->name == destAsInst->name ) {
[a32b204]	369	cost = Cost::zero;
	370	}
[eb0aedb]	371	} else if ( ( namedType = indexer.lookupType( inst->name ) ) ) {
[a32b204]	372	TypeDecl type = dynamic_cast< TypeDecl >( namedType );
	373	// all typedefs should be gone by this point
	374	assert( type );
[eb0aedb]	375	if ( type->base ) {
[721cd19f]	376	cost = costFunc( type->base, dest, indexer, env ) + Cost::safe;
[a32b204]	377	} // if
	378	} // if
	379	}
	380
[bd0b6b62]	381	void ConversionCost::postvisit( TupleType * tupleType ) {
[89be1c68]	382	Cost c = Cost::zero;
[b0837e4]	383	if ( TupleType * destAsTuple = dynamic_cast< TupleType * >( dest ) ) {
[eb0aedb]	384	std::list< Type * >::const_iterator srcIt = tupleType->types.begin();
	385	std::list< Type * >::const_iterator destIt = destAsTuple->types.begin();
	386	while ( srcIt != tupleType->types.end() && destIt != destAsTuple->types.end() ) {
[721cd19f]	387	Cost newCost = costFunc( srcIt++, destIt++, indexer, env );
[a32b204]	388	if ( newCost == Cost::infinity ) {
	389	return;
	390	} // if
	391	c += newCost;
	392	} // while
[eb0aedb]	393	if ( destIt != destAsTuple->types.end() ) {
[a32b204]	394	cost = Cost::infinity;
	395	} else {
	396	cost = c;
	397	} // if
	398	} // if
	399	}
[44b7088]	400
[bd0b6b62]	401	void ConversionCost::postvisit( VarArgsType * ) {
[90c3b1c]	402	if ( dynamic_cast< VarArgsType* >( dest ) ) {
[44b7088]	403	cost = Cost::zero;
	404	}
	405	}
[89e6ffc]	406
[bd0b6b62]	407	void ConversionCost::postvisit( ZeroType * ) {
[b0837e4]	408	if ( dynamic_cast< ZeroType * >( dest ) ) {
[89e6ffc]	409	cost = Cost::zero;
	410	} else if ( BasicType destAsBasic = dynamic_cast< BasicType >( dest ) ) {
	411	// copied from visit(BasicType*) for signed int, but +1 for safe conversions
	412	int tableResult = costMatrix[ BasicType::SignedInt ][ destAsBasic->get_kind() ];
	413	if ( tableResult == -1 ) {
[89be1c68]	414	cost = Cost::unsafe;
[89e6ffc]	415	} else {
[89be1c68]	416	cost = Cost::zero;
	417	cost.incSafe( tableResult + 1 );
[89e6ffc]	418	}
	419	} else if ( dynamic_cast< PointerType* >( dest ) ) {
[89be1c68]	420	cost = Cost::safe;
[89e6ffc]	421	}
	422	}
	423
[bd0b6b62]	424	void ConversionCost::postvisit( OneType * ) {
[b0837e4]	425	if ( dynamic_cast< OneType * >( dest ) ) {
[89e6ffc]	426	cost = Cost::zero;
	427	} else if ( BasicType destAsBasic = dynamic_cast< BasicType >( dest ) ) {
	428	// copied from visit(BasicType*) for signed int, but +1 for safe conversions
	429	int tableResult = costMatrix[ BasicType::SignedInt ][ destAsBasic->get_kind() ];
	430	if ( tableResult == -1 ) {
[89be1c68]	431	cost = Cost::unsafe;
[89e6ffc]	432	} else {
[89be1c68]	433	cost = Cost::zero;
	434	cost.incSafe( tableResult + 1 );
[89e6ffc]	435	}
	436	}
	437	}
[51b7345]	438	} // namespace ResolvExpr
[a32b204]	439
	440	// Local Variables: //
	441	// tab-width: 4 //
	442	// mode: c++ //
	443	// compile-command: "make install" //
	444	// End: //

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