[51b7345] | 1 | #include "typeops.h" |
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| 2 | #include "SynTree/Type.h" |
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| 3 | #include "SynTree/Declaration.h" |
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| 4 | #include "SynTree/Visitor.h" |
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| 5 | |
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| 6 | |
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| 7 | namespace ResolvExpr { |
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[c11e31c] | 8 | class PtrsAssignable : public Visitor { |
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| 9 | public: |
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| 10 | PtrsAssignable( Type *dest, const TypeEnvironment &env ); |
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[51b7345] | 11 | |
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[c11e31c] | 12 | int get_result() const { return result; } |
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| 13 | |
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| 14 | virtual void visit(VoidType *voidType); |
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| 15 | virtual void visit(BasicType *basicType); |
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| 16 | virtual void visit(PointerType *pointerType); |
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| 17 | virtual void visit(ArrayType *arrayType); |
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| 18 | virtual void visit(FunctionType *functionType); |
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| 19 | virtual void visit(StructInstType *inst); |
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| 20 | virtual void visit(UnionInstType *inst); |
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| 21 | virtual void visit(EnumInstType *inst); |
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| 22 | virtual void visit(ContextInstType *inst); |
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| 23 | virtual void visit(TypeInstType *inst); |
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| 24 | virtual void visit(TupleType *tupleType); |
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| 25 | private: |
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| 26 | Type *dest; |
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| 27 | int result; |
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| 28 | const TypeEnvironment &env; |
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| 29 | }; |
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| 30 | |
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| 31 | int ptrsAssignable( Type *src, Type *dest, const TypeEnvironment &env ) { |
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| 32 | if ( TypeInstType *destAsTypeInst = dynamic_cast< TypeInstType* >( dest ) ) { |
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| 33 | EqvClass eqvClass; |
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| 34 | if ( env.lookup( destAsTypeInst->get_name(), eqvClass ) ) { |
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| 35 | return ptrsAssignable( src, eqvClass.type, env ); |
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| 36 | } |
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| 37 | } |
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| 38 | if ( dynamic_cast< VoidType* >( dest ) ) { |
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| 39 | return 1; |
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| 40 | } else { |
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| 41 | PtrsAssignable ptrs( dest, env ); |
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| 42 | src->accept( ptrs ); |
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| 43 | return ptrs.get_result(); |
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| 44 | } |
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| 45 | } |
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| 46 | |
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| 47 | PtrsAssignable::PtrsAssignable( Type *dest, const TypeEnvironment &env ) : dest( dest ), result( 0 ), env( env ) { |
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| 48 | } |
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| 49 | |
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| 50 | void PtrsAssignable::visit(VoidType *voidType) { |
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| 51 | if ( dynamic_cast< FunctionType* >( dest ) ) { |
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| 52 | result = 0; |
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| 53 | } else { |
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| 54 | result = -1; |
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| 55 | } |
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| 56 | } |
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| 57 | |
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| 58 | void PtrsAssignable::visit( BasicType *basicType ) { |
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| 59 | } |
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| 60 | |
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| 61 | void PtrsAssignable::visit( PointerType *pointerType ) { |
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| 62 | } |
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| 63 | |
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| 64 | void PtrsAssignable::visit( ArrayType *arrayType ) { |
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| 65 | } |
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| 66 | |
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| 67 | void PtrsAssignable::visit( FunctionType *functionType ) { |
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| 68 | result = -1; |
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[51b7345] | 69 | } |
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[c11e31c] | 70 | |
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| 71 | void PtrsAssignable::visit( StructInstType *inst ) { |
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| 72 | // I don't think we should be doing anything here, but I'm willing to admit that I might be wrong |
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| 73 | } |
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| 74 | |
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| 75 | void PtrsAssignable::visit( UnionInstType *inst ) { |
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| 76 | // I don't think we should be doing anything here, but I'm willing to admit that I might be wrong |
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| 77 | } |
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| 78 | |
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| 79 | void PtrsAssignable::visit( EnumInstType *inst ) { |
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| 80 | if ( dynamic_cast< EnumInstType* >( inst ) ) { |
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| 81 | result = 1; |
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| 82 | } else if ( BasicType *bt = dynamic_cast< BasicType* >( inst ) ) { |
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| 83 | result = bt->get_kind() == BasicType::SignedInt; |
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| 84 | } |
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| 85 | } |
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| 86 | |
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| 87 | void PtrsAssignable::visit( ContextInstType *inst ) { |
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| 88 | // I definitely don't think we should be doing anything here |
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| 89 | } |
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| 90 | |
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| 91 | void PtrsAssignable::visit( TypeInstType *inst ) { |
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| 92 | EqvClass eqvClass; |
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| 93 | if ( env.lookup( inst->get_name(), eqvClass ) ) { |
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| 94 | result = ptrsAssignable( eqvClass.type, dest, env ); |
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| 95 | } else { |
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| 96 | result = 0; |
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| 97 | } |
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| 98 | } |
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| 99 | |
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| 100 | void PtrsAssignable::visit( TupleType *tupleType ) { |
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[51b7345] | 101 | /// // This code doesn't belong here, but it might be useful somewhere else |
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[c11e31c] | 102 | /// if ( TupleType *destAsTuple = dynamic_cast< TupleType* >( dest ) ) { |
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[51b7345] | 103 | /// int ret = 0; |
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| 104 | /// std::list< Type* >::const_iterator srcIt = tupleType->get_types().begin(); |
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| 105 | /// std::list< Type* >::const_iterator destIt = destAsTuple->get_types().begin(); |
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| 106 | /// while( srcIt != tupleType->get_types().end() && destIt != destAsTuple->get_types().end() ) { |
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| 107 | /// int assignResult = ptrsAssignable( *srcIt++, *destIt++ ); |
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[c11e31c] | 108 | /// if ( assignResult == 0 ) { |
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[51b7345] | 109 | /// result = assignResult; |
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| 110 | /// return; |
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| 111 | /// } else if ( assignResult < 0 ) { |
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| 112 | /// ret = -1; |
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| 113 | /// } else if ( ret > 0 ) { |
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| 114 | /// ret += assignResult; |
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| 115 | /// } |
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| 116 | /// } |
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[c11e31c] | 117 | /// if ( srcIt == tupleType->get_types().end() && destIt == destAsTuple->get_types().end() ) { |
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[51b7345] | 118 | /// result = ret; |
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| 119 | /// } else { |
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| 120 | /// result = 0; |
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| 121 | /// } |
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| 122 | /// } |
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[c11e31c] | 123 | } |
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[51b7345] | 124 | } // namespace ResolvExpr |
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