Changeset c6b4432 for src/ResolvExpr/PtrsAssignable.cc
- Timestamp:
- Nov 8, 2023, 2:01:11 PM (7 months ago)
- Branches:
- master
- Children:
- 3e4bf0d, f5ec35a
- Parents:
- 790d835
- File:
-
- 1 edited
Legend:
- Unmodified
- Added
- Removed
-
src/ResolvExpr/PtrsAssignable.cc
r790d835 rc6b4432 19 19 #include "AST/Type.hpp" 20 20 #include "AST/TypeEnvironment.hpp" 21 #include "Common/PassVisitor.h"22 #include "ResolvExpr/TypeEnvironment.h" // for EqvClass, TypeEnvironment23 #include "SynTree/Type.h" // for TypeInstType, Type, BasicType24 #include "SynTree/Visitor.h" // for Visitor25 26 21 27 22 namespace ResolvExpr { 28 struct PtrsAssignable : public WithShortCircuiting {29 PtrsAssignable( const Type * dest, const TypeEnvironment &env );30 31 int get_result() const { return result; }32 33 void previsit( const Type * ) { visit_children = false; }34 35 void postvisit( const VoidType * voidType );36 void postvisit( const BasicType * basicType );37 void postvisit( const PointerType * pointerType );38 void postvisit( const ArrayType * arrayType );39 void postvisit( const FunctionType * functionType );40 void postvisit( const StructInstType * inst );41 void postvisit( const UnionInstType * inst );42 void postvisit( const EnumInstType * inst );43 void postvisit( const TraitInstType * inst );44 void postvisit( const TypeInstType * inst );45 void postvisit( const TupleType * tupleType );46 void postvisit( const VarArgsType * varArgsType );47 void postvisit( const ZeroType * zeroType );48 void postvisit( const OneType * oneType );49 private:50 const Type * dest;51 int result;52 const TypeEnvironment &env;53 };54 55 int ptrsAssignable( const Type *src, const Type * dest, const TypeEnvironment &env ) {56 // std::cerr << "assignable: " << src << " | " << dest << std::endl;57 if ( const TypeInstType * destAsTypeInst = dynamic_cast< const TypeInstType* >( dest ) ) {58 if ( const EqvClass * eqvClass = env.lookup( destAsTypeInst->get_name() ) ) {59 return ptrsAssignable( src, eqvClass->type, env );60 } // if61 } // if62 if ( dynamic_cast< const VoidType* >( dest ) ) {63 // void * = T * for any T is unsafe64 // xxx - this should be safe, but that currently breaks the build65 return -1;66 } else {67 PassVisitor<PtrsAssignable> ptrs( dest, env );68 src->accept( ptrs );69 return ptrs.pass.get_result();70 } // if71 }72 73 PtrsAssignable::PtrsAssignable( const Type * dest, const TypeEnvironment &env ) : dest( dest ), result( 0 ), env( env ) {}74 75 void PtrsAssignable::postvisit( const VoidType * ) {76 // T * = void * is disallowed - this is a change from C, where any77 // void * can be assigned or passed to a non-void pointer without a cast.78 }79 80 void PtrsAssignable::postvisit( const BasicType * ) {}81 void PtrsAssignable::postvisit( const PointerType * ) {}82 void PtrsAssignable::postvisit( const ArrayType * ) {}83 void PtrsAssignable::postvisit( const FunctionType * ) {}84 85 void PtrsAssignable::postvisit( const StructInstType * ) {}86 void PtrsAssignable::postvisit( const UnionInstType * ) {}87 88 void PtrsAssignable::postvisit( const EnumInstType * ) {89 if ( dynamic_cast< const BasicType* >( dest ) ) {90 // int * = E *, etc. is safe. This isn't technically correct, as each91 // enum has one basic type that it is compatible with, an that type can92 // differ from enum to enum. Without replicating GCC's internal logic,93 // there is no way to know which type this particular enum is compatible94 // with, so punt on this for now.95 result = 1;96 }97 }98 99 void PtrsAssignable::postvisit( const TraitInstType * ) {}100 void PtrsAssignable::postvisit( const TypeInstType * inst ) {101 if ( const EqvClass * eqvClass = env.lookup( inst->name ) ) {102 if ( eqvClass->type ) {103 // T * = S * for any S depends on the type bound to T104 result = ptrsAssignable( eqvClass->type, dest, env );105 }106 } // if107 }108 109 void PtrsAssignable::postvisit( const TupleType * ) {}110 void PtrsAssignable::postvisit( const VarArgsType * ) {}111 void PtrsAssignable::postvisit( const ZeroType * ) {}112 void PtrsAssignable::postvisit( const OneType * ) {}113 23 114 24 // TODO: Get rid of the `_new` suffix when the old version is removed.
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