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