| 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 | // CastCost.cc --
|
|---|
| 8 | //
|
|---|
| 9 | // Author : Richard C. Bilson
|
|---|
| 10 | // Created On : Sun May 17 06:57:43 2015
|
|---|
| 11 | // Last Modified By : Rob Schluntz
|
|---|
| 12 | // Last Modified On : Mon Oct 05 14:48:45 2015
|
|---|
| 13 | // Update Count : 5
|
|---|
| 14 | //
|
|---|
| 15 |
|
|---|
| 16 | #include "typeops.h"
|
|---|
| 17 | #include "Cost.h"
|
|---|
| 18 | #include "ConversionCost.h"
|
|---|
| 19 | #include "SynTree/Type.h"
|
|---|
| 20 | #include "SynTree/Visitor.h"
|
|---|
| 21 | #include "SymTab/Indexer.h"
|
|---|
| 22 |
|
|---|
| 23 |
|
|---|
| 24 | namespace ResolvExpr {
|
|---|
| 25 | class CastCost : public ConversionCost {
|
|---|
| 26 | public:
|
|---|
| 27 | CastCost( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env );
|
|---|
| 28 |
|
|---|
| 29 | virtual void visit( BasicType *basicType );
|
|---|
| 30 | virtual void visit( PointerType *pointerType );
|
|---|
| 31 | };
|
|---|
| 32 |
|
|---|
| 33 | Cost castCost( Type *src, Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env ) {
|
|---|
| 34 | if ( TypeInstType *destAsTypeInst = dynamic_cast< TypeInstType* >( dest ) ) {
|
|---|
| 35 | EqvClass eqvClass;
|
|---|
| 36 | NamedTypeDecl *namedType;
|
|---|
| 37 | if ( env.lookup( destAsTypeInst->get_name(), eqvClass ) ) {
|
|---|
| 38 | return castCost( src, eqvClass.type, indexer, env );
|
|---|
| 39 | } else if ( ( namedType = indexer.lookupType( destAsTypeInst->get_name() ) ) ) {
|
|---|
| 40 | TypeDecl *type = dynamic_cast< TypeDecl* >( namedType );
|
|---|
| 41 | // all typedefs should be gone by this point
|
|---|
| 42 | assert( type );
|
|---|
| 43 | if ( type->get_base() ) {
|
|---|
| 44 | return castCost( src, type->get_base(), indexer, env ) + Cost( 0, 0, 1 );
|
|---|
| 45 | } // if
|
|---|
| 46 | } // if
|
|---|
| 47 | } // if
|
|---|
| 48 | if ( typesCompatibleIgnoreQualifiers( src, dest, indexer, env ) ) {
|
|---|
| 49 | return Cost( 0, 0, 0 );
|
|---|
| 50 | } else if ( dynamic_cast< VoidType* >( dest ) ) {
|
|---|
| 51 | return Cost( 0, 0, 1 );
|
|---|
| 52 | } else {
|
|---|
| 53 | CastCost converter( dest, indexer, env );
|
|---|
| 54 | src->accept( converter );
|
|---|
| 55 | if ( converter.get_cost() == Cost::infinity ) {
|
|---|
| 56 | return Cost::infinity;
|
|---|
| 57 | } else {
|
|---|
| 58 | // xxx - why are we adding cost 0 here?
|
|---|
| 59 | return converter.get_cost() + Cost( 0, 0, 0 );
|
|---|
| 60 | } // if
|
|---|
| 61 | } // if
|
|---|
| 62 | }
|
|---|
| 63 |
|
|---|
| 64 | CastCost::CastCost( Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env )
|
|---|
| 65 | : ConversionCost( dest, indexer, env ) {
|
|---|
| 66 | }
|
|---|
| 67 |
|
|---|
| 68 | void CastCost::visit( BasicType *basicType ) {
|
|---|
| 69 | PointerType *destAsPointer = dynamic_cast< PointerType* >( dest );
|
|---|
| 70 | if ( destAsPointer && basicType->isInteger() ) {
|
|---|
| 71 | cost = Cost( 1, 0, 0 );
|
|---|
| 72 | } else {
|
|---|
| 73 | ConversionCost::visit( basicType );
|
|---|
| 74 | } // if
|
|---|
| 75 | }
|
|---|
| 76 |
|
|---|
| 77 | void CastCost::visit( PointerType *pointerType ) {
|
|---|
| 78 | if ( PointerType *destAsPtr = dynamic_cast< PointerType* >( dest ) ) {
|
|---|
| 79 | if ( pointerType->get_qualifiers() <= destAsPtr->get_qualifiers() && typesCompatibleIgnoreQualifiers( pointerType->get_base(), destAsPtr->get_base(), indexer, env ) ) {
|
|---|
| 80 | cost = Cost( 0, 0, 1 );
|
|---|
| 81 | } else {
|
|---|
| 82 | TypeEnvironment newEnv( env );
|
|---|
| 83 | newEnv.add( pointerType->get_forall() );
|
|---|
| 84 | newEnv.add( pointerType->get_base()->get_forall() );
|
|---|
| 85 | int castResult = ptrsCastable( pointerType->get_base(), destAsPtr->get_base(), newEnv, indexer );
|
|---|
| 86 | if ( castResult > 0 ) {
|
|---|
| 87 | cost = Cost( 0, 0, 1 );
|
|---|
| 88 | } else if ( castResult < 0 ) {
|
|---|
| 89 | cost = Cost( 1, 0, 0 );
|
|---|
| 90 | } // if
|
|---|
| 91 | } // if
|
|---|
| 92 | } else if ( BasicType *destAsBasic = dynamic_cast< BasicType* >( dest ) ) {
|
|---|
| 93 | if ( destAsBasic->isInteger() ) {
|
|---|
| 94 | cost = Cost( 1, 0, 0 );
|
|---|
| 95 | } // if
|
|---|
| 96 | }
|
|---|
| 97 | }
|
|---|
| 98 | } // namespace ResolvExpr
|
|---|
| 99 |
|
|---|
| 100 | // Local Variables: //
|
|---|
| 101 | // tab-width: 4 //
|
|---|
| 102 | // mode: c++ //
|
|---|
| 103 | // compile-command: "make install" //
|
|---|
| 104 | // End: //
|
|---|
