Context Navigation

source: src/ResolvExpr/ConversionCost.cc @ 1cb758f2

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

Last change on this file since 1cb758f2 was 0c6596f, checked in by Rob Schluntz <rschlunt@…>, 7 years ago
Handle difference between reference casting and implicit conversion costs [fixes #39]
Property mode set to `100644`
File size: 17.4 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
[4040425]	12	// Last Modified On : Wed Mar 2 17:35:46 2016
	13	// Update Count : 6
[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 {
[7ebaa56]	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;
[5ccb10d]	46	PRINT( std::cerr << "type inst " << destAsTypeInst->get_name(); )
[a32b204]	47	if ( env.lookup( destAsTypeInst->get_name(), eqvClass ) ) {
[0b150ec]	48	if ( eqvClass.type ) {
	49	return conversionCost( src, eqvClass.type, indexer, env );
	50	} else {
	51	return Cost::infinity;
	52	}
[a32b204]	53	} else if ( ( namedType = indexer.lookupType( destAsTypeInst->get_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 );
	58	if ( type->get_base() ) {
[89be1c68]	59	return conversionCost( src, type->get_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; )
[0c6596f]	79	return convertToReferenceCost( src, refType, indexer, env, [](Type * t1, Type * t2, const TypeEnvironment & env, const SymTab::Indexer &){
	80	return ptrsAssignable( t1, t2, env );
	81	});
[a32b204]	82	} else {
	83	ConversionCost converter( dest, indexer, env );
	84	src->accept( converter );
	85	if ( converter.get_cost() == Cost::infinity ) {
	86	return Cost::infinity;
	87	} else {
[89be1c68]	88	return converter.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 ) {
[5ccb10d]	94	PRINT( std::cerr << "convert to reference cost..." << std::endl; )
[89be1c68]	95	if ( diff > 0 ) {
	96	// TODO: document this
[0c6596f]	97	Cost cost = convertToReferenceCost( safe_dynamic_cast< ReferenceType * >( src )->get_base(), dest, diff-1, indexer, env, func );
[7ebaa56]	98	cost.incReference();
[89be1c68]	99	return cost;
	100	} else if ( diff < -1 ) {
	101	// TODO: document this
[0c6596f]	102	Cost cost = convertToReferenceCost( src, safe_dynamic_cast< ReferenceType * >( dest )->get_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; )
[89be1c68]	110	if ( srcAsRef->get_base()->get_qualifiers() <= destAsRef->get_base()->get_qualifiers() && typesCompatibleIgnoreQualifiers( srcAsRef->get_base(), destAsRef->get_base(), indexer, env ) ) {
	111	return Cost::safe;
	112	} else { // xxx - this discards reference qualifiers from consideration -- reducing qualifiers is a safe conversion; is this right?
[0c6596f]	113	int assignResult = func( srcAsRef->get_base(), destAsRef->get_base(), env, indexer );
[5ccb10d]	114	PRINT( std::cerr << "comparing references: " << assignResult << " " << srcAsRef << " " << destAsRef << std::endl; )
[89be1c68]	115	if ( assignResult < 0 ) {
	116	return Cost::safe;
	117	} else if ( assignResult > 0 ) {
	118	return Cost::unsafe;
	119	} // if
[2463d0e]	120	} // if
	121	} else {
[5ccb10d]	122	PRINT( std::cerr << "reference to rvalue conversion" << std::endl; )
[89be1c68]	123	ConversionCost converter( dest, indexer, env );
	124	src->accept( converter );
	125	return converter.get_cost();
	126	} // if
[2463d0e]	127	} else {
[89be1c68]	128	ReferenceType * destAsRef = dynamic_cast< ReferenceType * >( dest );
	129	assert( diff == -1 && destAsRef );
	130	if ( typesCompatibleIgnoreQualifiers( src, destAsRef->get_base(), indexer, env ) ) {
[5ccb10d]	131	PRINT( std::cerr << "converting compatible base type" << std::endl; )
[89be1c68]	132	if ( src->get_lvalue() ) {
[5ccb10d]	133	PRINT(
	134	std::cerr << "lvalue to reference conversion" << std::endl;
	135	std::cerr << src << " => " << destAsRef << std::endl;
	136	)
[89be1c68]	137	// lvalue-to-reference conversion: cv lvalue T => cv T &
	138	if ( src->get_qualifiers() == destAsRef->get_base()->get_qualifiers() ) {
[7ebaa56]	139	return Cost::reference; // cost needs to be non-zero to add cast
[89be1c68]	140	} if ( src->get_qualifiers() < destAsRef->get_base()->get_qualifiers() ) {
[7ebaa56]	141	return Cost::safe; // cost needs to be higher than previous cast to differentiate adding qualifiers vs. keeping same
[89be1c68]	142	} else {
	143	return Cost::unsafe;
	144	} // if
	145	} else if ( destAsRef->get_base()->get_const() ) {
[5ccb10d]	146	PRINT( std::cerr << "rvalue to const ref conversion" << std::endl; )
[89be1c68]	147	// rvalue-to-const-reference conversion: T => const T &
	148	return Cost::safe;
	149	} else {
[5ccb10d]	150	PRINT( std::cerr << "rvalue to non-const reference conversion" << std::endl; )
[89be1c68]	151	// rvalue-to-reference conversion: T => T &
	152	return Cost::unsafe;
	153	} // if
	154	} // if
[5ccb10d]	155	PRINT( std::cerr << "attempting to convert from incompatible base type -- fail" << std::endl; )
[2463d0e]	156	}
	157	return Cost::infinity;
	158	}
	159
[0c6596f]	160	Cost convertToReferenceCost( Type * src, ReferenceType * dest, const SymTab::Indexer & indexer, const TypeEnvironment & env, PtrsFunction func ) {
[89be1c68]	161	int sdepth = src->referenceDepth(), ddepth = dest->referenceDepth();
[0c6596f]	162	return convertToReferenceCost( src, dest, sdepth-ddepth, indexer, env, func );
[89be1c68]	163	}
	164
[a32b204]	165	ConversionCost::ConversionCost( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env )
	166	: dest( dest ), indexer( indexer ), cost( Cost::infinity ), env( env ) {
	167	}
[51b7345]	168
	169	/*
[a32b204]	170	Old
	171	===
	172	Double
	173	\|
	174	Float
	175	\|
	176	ULong
	177	/ \
	178	UInt Long
	179	\ /
	180	Int
	181	\|
	182	Ushort
	183	\|
	184	Short
	185	\|
	186	Uchar
	187	/ \
	188	Schar Char
	189
	190	New
	191	===
	192	+-----LongDoubleComplex--+
	193	LongDouble--+ \| +-LongDoubleImag
	194	\| +---DoubleComplex---+ \|
	195	Double------+ \| +----DoubleImag
	196	\| +-FloatComplex-+ \|
	197	Float---------+ +-------FloatImag
	198	\|
	199	ULongLong
	200	\|
	201	LongLong
	202	\|
	203	ULong
	204	/ \
	205	UInt Long
	206	\ /
	207	Int
	208	\|
	209	Ushort
	210	\|
	211	Short
	212	\|
	213	Uchar
	214	/ \
	215	Schar Char
	216	\ /
	217	Bool
[51b7345]	218	*/
	219
[a32b204]	220	static const int costMatrix[ BasicType::NUMBER_OF_BASIC_TYPES ][ BasicType::NUMBER_OF_BASIC_TYPES ] =
	221	{
	222	/* Src \ Dest: Bool Char SChar UChar Short UShort Int UInt Long ULong LLong ULLong Float Double LDbl FCplex DCplex LDCplex FImag DImag LDImag */
	223	/* Bool */ { 0, 1, 1, 2, 3, 4, 5, 6, 6, 7, 8, 9, 10, 11, 12, 11, 12, 13, -1, -1, -1 },
	224	/* Char */ { -1, 0, -1, 1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10, 11, 10, 11, 12, -1, -1, -1 },
	225	/* SChar */ { -1, -1, 0, 1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10, 11, 10, 11, 12, -1, -1, -1 },
	226	/* UChar */ { -1, -1, -1, 0, 1, 2, 3, 4, 4, 5, 6, 7, 8, 9, 10, 9, 10, 11, -1, -1, -1 },
	227	/* Short */ { -1, -1, -1, -1, 0, 1, 2, 3, 3, 4, 5, 6, 7, 8, 9, 8, 9, 10, -1, -1, -1 },
	228	/* UShort */{ -1, -1, -1, -1, -1, 0, 1, 2, 2, 3, 4, 5, 6, 7, 8, 7, 8, 9, -1, -1, -1 },
	229	/* Int */ { -1, -1, -1, -1, -1, -1, 0, 1, 1, 2, 3, 4, 5, 6, 7, 6, 7, 8, -1, -1, -1 },
	230	/* UInt */ { -1, -1, -1, -1, -1, -1, -1, 0, -1, 1, 2, 3, 4, 5, 6, 5, 6, 7, -1, -1, -1 },
	231	/* Long */ { -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 5, 6, 7, -1, -1, -1 },
	232	/* ULong */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 4, 5, 6, -1, -1, -1 },
	233	/* LLong */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 3, 4, 5, -1, -1, -1 },
	234	/* ULLong */{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 2, 3, 4, -1, -1, -1 },
	235	/* Float */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 1, 2, 3, -1, -1, -1 },
	236	/* Double */{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, -1, 1, 2, -1, -1, -1 },
	237	/* LDbl */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, 1, -1, -1, -1 },
	238	/* FCplex */{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, -1, -1 },
	239	/* DCplex */{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, -1, -1, -1 },
	240	/* LDCplex */{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1 },
	241	/* FImag */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 3, 0, 1, 2 },
	242	/* DImag */ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, -1, 0, 1 },
	243	/* LDImag */{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, 0 }
	244	};
	245
[7e003011]	246	void ConversionCost::visit( __attribute((unused)) VoidType *voidType ) {
[a32b204]	247	cost = Cost::infinity;
	248	}
	249
	250	void ConversionCost::visit(BasicType *basicType) {
	251	if ( BasicType destAsBasic = dynamic_cast< BasicType >( dest ) ) {
	252	int tableResult = costMatrix[ basicType->get_kind() ][ destAsBasic->get_kind() ];
	253	if ( tableResult == -1 ) {
[89be1c68]	254	cost = Cost::unsafe;
[a32b204]	255	} else {
[89be1c68]	256	cost = Cost::zero;
	257	cost.incSafe( tableResult );
[a32b204]	258	} // if
[a436947]	259	} else if ( dynamic_cast< EnumInstType *>( dest ) ) {
	260	// xxx - not positive this is correct, but appears to allow casting int => enum
[89be1c68]	261	cost = Cost::unsafe;
[89e6ffc]	262	} else if ( dynamic_cast< ZeroType* >( dest ) != nullptr \|\| dynamic_cast< OneType* >( dest ) != nullptr ) {
[89be1c68]	263	cost = Cost::unsafe;
[89e6ffc]	264	} // if
[a32b204]	265	}
	266
	267	void ConversionCost::visit(PointerType *pointerType) {
	268	if ( PointerType destAsPtr = dynamic_cast< PointerType >( dest ) ) {
[5ccb10d]	269	PRINT( std::cerr << pointerType << " ===> " << destAsPtr; )
[cb43451]	270	Type::Qualifiers tq1 = pointerType->get_base()->get_qualifiers();
	271	Type::Qualifiers tq2 = destAsPtr->get_base()->get_qualifiers();
	272	if ( tq1 <= tq2 && typesCompatibleIgnoreQualifiers( pointerType->get_base(), destAsPtr->get_base(), indexer, env ) ) {
	273	if ( tq1 == tq2 ) {
	274	// types are the same
	275	cost = Cost::zero;
	276	} else {
	277	// types are the same, except otherPointer has more qualifiers
[5ccb10d]	278	PRINT( std::cerr << " :: compatible and good qualifiers" << std::endl; )
[cb43451]	279	cost = Cost::safe;
	280	}
	281	} else { // xxx - this discards qualifiers from consideration -- reducing qualifiers is a safe conversion; is this right?
[a32b204]	282	int assignResult = ptrsAssignable( pointerType->get_base(), destAsPtr->get_base(), env );
[5ccb10d]	283	PRINT( std::cerr << " :: " << assignResult << std::endl; )
[cb43451]	284	if ( assignResult < 0 && pointerType->get_base()->get_qualifiers() <= destAsPtr->get_qualifiers() ) {
[89be1c68]	285	cost = Cost::safe;
[a32b204]	286	} else if ( assignResult > 0 ) {
[89be1c68]	287	cost = Cost::unsafe;
[a32b204]	288	} // if
[cb43451]	289	// assignResult == 0 means Cost::Infinity
[a32b204]	290	} // if
[89e6ffc]	291	} else if ( dynamic_cast< ZeroType* >( dest ) != nullptr \|\| dynamic_cast< OneType* >( dest ) != nullptr ) {
[89be1c68]	292	cost = Cost::unsafe;
[a32b204]	293	} // if
	294	}
	295
[7e003011]	296	void ConversionCost::visit(__attribute((unused)) ArrayType *arrayType) {}
[2463d0e]	297
	298	void ConversionCost::visit(ReferenceType *refType) {
	299	// Note: dest can never be a reference, since it would have been caught in an earlier check
	300	assert( ! dynamic_cast< ReferenceType * >( dest ) );
	301	// convert reference to rvalue: cv T1 & => T2
	302	// recursively compute conversion cost from T1 to T2.
	303	// cv can be safely dropped because of 'implicit dereference' behavior.
	304	refType->get_base()->accept( *this );
[cb43451]	305	if ( refType->get_base()->get_qualifiers() == dest->get_qualifiers() ) {
	306	cost.incReference(); // prefer exact qualifiers
	307	} else if ( refType->get_base()->get_qualifiers() < dest->get_qualifiers() ) {
	308	cost.incSafe(); // then gaining qualifiers
	309	} else {
	310	cost.incUnsafe(); // lose qualifiers as last resort
	311	}
[5ccb10d]	312	PRINT( std::cerr << refType << " ==> " << dest << " " << cost << std::endl; )
[2463d0e]	313	}
	314
[7e003011]	315	void ConversionCost::visit(__attribute((unused)) FunctionType *functionType) {}
[a32b204]	316
	317	void ConversionCost::visit(StructInstType *inst) {
	318	if ( StructInstType destAsInst = dynamic_cast< StructInstType >( dest ) ) {
	319	if ( inst->get_name() == destAsInst->get_name() ) {
	320	cost = Cost::zero;
	321	} // if
	322	} // if
	323	}
	324
	325	void ConversionCost::visit(UnionInstType *inst) {
	326	if ( StructInstType destAsInst = dynamic_cast< StructInstType >( dest ) ) {
	327	if ( inst->get_name() == destAsInst->get_name() ) {
	328	cost = Cost::zero;
	329	} // if
	330	} // if
	331	}
	332
[7e003011]	333	void ConversionCost::visit( __attribute((unused)) EnumInstType *inst ) {
[a32b204]	334	static Type::Qualifiers q;
	335	static BasicType integer( q, BasicType::SignedInt );
[2463d0e]	336	integer.accept( *this ); // safe if dest >= int
[89be1c68]	337	if ( cost < Cost::unsafe ) {
[a32b204]	338	cost.incSafe();
	339	} // if
	340	}
	341
[7e003011]	342	void ConversionCost::visit( __attribute((unused)) TraitInstType *inst) {
[a32b204]	343	}
	344
	345	void ConversionCost::visit(TypeInstType *inst) {
	346	EqvClass eqvClass;
	347	NamedTypeDecl *namedType;
	348	if ( env.lookup( inst->get_name(), eqvClass ) ) {
	349	cost = conversionCost( eqvClass.type, dest, indexer, env );
	350	} else if ( TypeInstType destAsInst = dynamic_cast< TypeInstType >( dest ) ) {
	351	if ( inst->get_name() == destAsInst->get_name() ) {
	352	cost = Cost::zero;
	353	}
	354	} else if ( ( namedType = indexer.lookupType( inst->get_name() ) ) ) {
	355	TypeDecl type = dynamic_cast< TypeDecl >( namedType );
	356	// all typedefs should be gone by this point
	357	assert( type );
	358	if ( type->get_base() ) {
[89be1c68]	359	cost = conversionCost( type->get_base(), dest, indexer, env ) + Cost::safe;
[a32b204]	360	} // if
	361	} // if
	362	}
	363
[7e003011]	364	void ConversionCost::visit( __attribute((unused)) TupleType *tupleType) {
[89be1c68]	365	Cost c = Cost::zero;
[a32b204]	366	if ( TupleType destAsTuple = dynamic_cast< TupleType >( dest ) ) {
	367	std::list< Type* >::const_iterator srcIt = tupleType->get_types().begin();
	368	std::list< Type* >::const_iterator destIt = destAsTuple->get_types().begin();
[4ab9536]	369	while ( srcIt != tupleType->get_types().end() && destIt != destAsTuple->get_types().end() ) {
[a32b204]	370	Cost newCost = conversionCost( srcIt++, destIt++, indexer, env );
	371	if ( newCost == Cost::infinity ) {
	372	return;
	373	} // if
	374	c += newCost;
	375	} // while
	376	if ( destIt != destAsTuple->get_types().end() ) {
	377	cost = Cost::infinity;
	378	} else {
	379	cost = c;
	380	} // if
	381	} // if
	382	}
[44b7088]	383
[7e003011]	384	void ConversionCost::visit( __attribute((unused)) VarArgsType *varArgsType) {
[90c3b1c]	385	if ( dynamic_cast< VarArgsType* >( dest ) ) {
[44b7088]	386	cost = Cost::zero;
	387	}
	388	}
[89e6ffc]	389
[7e003011]	390	void ConversionCost::visit( __attribute((unused)) ZeroType *zeroType) {
[89e6ffc]	391	if ( dynamic_cast< ZeroType* >( dest ) ) {
	392	cost = Cost::zero;
	393	} else if ( BasicType destAsBasic = dynamic_cast< BasicType >( dest ) ) {
	394	// copied from visit(BasicType*) for signed int, but +1 for safe conversions
	395	int tableResult = costMatrix[ BasicType::SignedInt ][ destAsBasic->get_kind() ];
	396	if ( tableResult == -1 ) {
[89be1c68]	397	cost = Cost::unsafe;
[89e6ffc]	398	} else {
[89be1c68]	399	cost = Cost::zero;
	400	cost.incSafe( tableResult + 1 );
[89e6ffc]	401	}
	402	} else if ( dynamic_cast< PointerType* >( dest ) ) {
[89be1c68]	403	cost = Cost::safe;
[89e6ffc]	404	}
	405	}
	406
[7e003011]	407	void ConversionCost::visit( __attribute((unused)) OneType *oneType) {
[89e6ffc]	408	if ( dynamic_cast< OneType* >( dest ) ) {
	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	}
	420	}
[51b7345]	421	} // namespace ResolvExpr
[a32b204]	422
	423	// Local Variables: //
	424	// tab-width: 4 //
	425	// mode: c++ //
	426	// compile-command: "make install" //
	427	// End: //

Note: See TracBrowser for help on using the repository browser.

Download in other formats: