| 1 | //
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
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| 3 | //
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| 4 | // The contents of this file are covered under the licence agreement in the
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| 5 | // file "LICENCE" distributed with Cforall.
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| 6 | //
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| 7 | // PtrsAssignable.cc --
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| 8 | //
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| 9 | // Author : Richard C. Bilson
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| 10 | // Created On : Sun May 17 11:44:11 2015
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| 11 | // Last Modified By : Peter A. Buhr
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| 12 | // Last Modified On : Wed Mar 2 17:36:05 2016
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| 13 | // Update Count : 8
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| 14 | //
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| 15 |
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| 16 | #include "Common/PassVisitor.h"
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| 17 | #include "ResolvExpr/TypeEnvironment.h" // for EqvClass, TypeEnvironment
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| 18 | #include "SynTree/Type.h" // for TypeInstType, Type, BasicType
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| 19 | #include "SynTree/Visitor.h" // for Visitor
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| 20 |
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| 21 |
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| 22 | namespace ResolvExpr {
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| 23 | struct PtrsAssignable : public WithShortCircuiting {
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| 24 | PtrsAssignable( Type *dest, const TypeEnvironment &env );
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| 25 |
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| 26 | int get_result() const { return result; }
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| 27 |
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| 28 | void previsit( Type * ) { visit_children = false; }
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| 29 |
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| 30 | void postvisit( VoidType * voidType );
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| 31 | void postvisit( BasicType * basicType );
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| 32 | void postvisit( PointerType * pointerType );
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| 33 | void postvisit( ArrayType * arrayType );
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| 34 | void postvisit( FunctionType * functionType );
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| 35 | void postvisit( StructInstType * inst );
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| 36 | void postvisit( UnionInstType * inst );
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| 37 | void postvisit( EnumInstType * inst );
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| 38 | void postvisit( TraitInstType * inst );
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| 39 | void postvisit( TypeInstType * inst );
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| 40 | void postvisit( TupleType * tupleType );
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| 41 | void postvisit( VarArgsType * varArgsType );
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| 42 | void postvisit( ZeroType * zeroType );
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| 43 | void postvisit( OneType * oneType );
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| 44 | private:
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| 45 | Type *dest;
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| 46 | int result;
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| 47 | const TypeEnvironment &env;
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| 48 | };
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| 49 |
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| 50 | int ptrsAssignable( Type *src, Type *dest, const TypeEnvironment &env ) {
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| 51 | // std::cerr << "assignable: " << src << " | " << dest << std::endl;
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| 52 | if ( TypeInstType *destAsTypeInst = dynamic_cast< TypeInstType* >( dest ) ) {
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| 53 | EqvClass eqvClass;
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| 54 | if ( env.lookup( destAsTypeInst->get_name(), eqvClass ) ) {
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| 55 | return ptrsAssignable( src, eqvClass.type, env );
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| 56 | } // if
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| 57 | } // if
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| 58 | if ( dynamic_cast< VoidType* >( dest ) ) {
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| 59 | // void * = T * for any T is unsafe
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| 60 | // xxx - this should be safe, but that currently breaks the build
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| 61 | return -1;
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| 62 | } else {
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| 63 | PassVisitor<PtrsAssignable> ptrs( dest, env );
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| 64 | src->accept( ptrs );
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| 65 | return ptrs.pass.get_result();
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| 66 | } // if
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| 67 | }
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| 68 |
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| 69 | PtrsAssignable::PtrsAssignable( Type *dest, const TypeEnvironment &env ) : dest( dest ), result( 0 ), env( env ) {}
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| 70 |
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| 71 | void PtrsAssignable::postvisit( VoidType * ) {
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| 72 | // T * = void * is disallowed - this is a change from C, where any
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| 73 | // void * can be assigned or passed to a non-void pointer without a cast.
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| 74 | }
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| 75 |
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| 76 | void PtrsAssignable::postvisit( __attribute__((unused)) BasicType *basicType ) {}
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| 77 | void PtrsAssignable::postvisit( __attribute__((unused)) PointerType *pointerType ) {}
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| 78 | void PtrsAssignable::postvisit( __attribute__((unused)) ArrayType *arrayType ) {}
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| 79 | void PtrsAssignable::postvisit( __attribute__((unused)) FunctionType *functionType ) {}
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| 80 |
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| 81 | void PtrsAssignable::postvisit( __attribute__((unused)) StructInstType *inst ) {}
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| 82 | void PtrsAssignable::postvisit( __attribute__((unused)) UnionInstType *inst ) {}
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| 83 |
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| 84 | void PtrsAssignable::postvisit( EnumInstType * ) {
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| 85 | if ( dynamic_cast< BasicType* >( dest ) ) {
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| 86 | // int * = E *, etc. is safe. This isn't technically correct, as each
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| 87 | // enum has one basic type that it is compatible with, an that type can
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| 88 | // differ from enum to enum. Without replicating GCC's internal logic,
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| 89 | // there is no way to know which type this particular enum is compatible
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| 90 | // with, so punt on this for now.
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| 91 | result = 1;
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| 92 | }
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| 93 | }
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| 94 |
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| 95 | void PtrsAssignable::postvisit( __attribute__((unused)) TraitInstType *inst ) {}
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| 96 | void PtrsAssignable::postvisit( TypeInstType *inst ) {
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| 97 | EqvClass eqvClass;
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| 98 | if ( env.lookup( inst->get_name(), eqvClass ) && eqvClass.type ) {
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| 99 | // T * = S * for any S depends on the type bound to T
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| 100 | result = ptrsAssignable( eqvClass.type, dest, env );
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| 101 | } // if
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| 102 | }
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| 103 |
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| 104 | void PtrsAssignable::postvisit( __attribute__((unused)) TupleType *tupleType ) {}
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| 105 | void PtrsAssignable::postvisit( __attribute__((unused)) VarArgsType *varArgsType ) {}
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| 106 | void PtrsAssignable::postvisit( __attribute__((unused)) ZeroType *zeroType ) {}
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| 107 | void PtrsAssignable::postvisit( __attribute__((unused)) OneType *oneType ) {}
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| 108 |
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| 109 | } // namespace ResolvExpr
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| 110 |
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| 111 | // Local Variables: //
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| 112 | // tab-width: 4 //
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| 113 | // mode: c++ //
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| 114 | // compile-command: "make install" //
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| 115 | // End: //
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