[a32b204] | 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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[906e24d] | 7 | // ResolveTypeof.cc -- |
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[a32b204] | 8 | // |
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| 9 | // Author : Richard C. Bilson |
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| 10 | // Created On : Sun May 17 12:12:20 2015 |
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| 11 | // Last Modified By : Peter A. Buhr |
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[a08ba92] | 12 | // Last Modified On : Tue May 19 16:49:04 2015 |
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| 13 | // Update Count : 3 |
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[a32b204] | 14 | // |
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| 15 | |
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[51b7345] | 16 | #include "ResolveTypeof.h" |
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[ea6332d] | 17 | |
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| 18 | #include <cassert> // for assert |
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| 19 | |
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[0f6a7752] | 20 | #include "AST/CVQualifiers.hpp" |
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| 21 | #include "AST/Node.hpp" |
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| 22 | #include "AST/Pass.hpp" |
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| 23 | #include "AST/Type.hpp" |
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| 24 | #include "AST/TypeEnvironment.hpp" |
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[9d79f93] | 25 | #include "Common/PassVisitor.h" // for PassVisitor |
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[0f6a7752] | 26 | #include "Common/utility.h" // for copy |
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[ea6332d] | 27 | #include "Resolver.h" // for resolveInVoidContext |
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| 28 | #include "SynTree/Expression.h" // for Expression |
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| 29 | #include "SynTree/Mutator.h" // for Mutator |
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| 30 | #include "SynTree/Type.h" // for TypeofType, Type |
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[16ba4a6] | 31 | #include "SymTab/Mangler.h" |
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| 32 | #include "InitTweak/InitTweak.h" // for isConstExpr |
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[ea6332d] | 33 | |
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| 34 | namespace SymTab { |
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| 35 | class Indexer; |
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| 36 | } // namespace SymTab |
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[51b7345] | 37 | |
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| 38 | namespace ResolvExpr { |
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[a08ba92] | 39 | namespace { |
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[51b7345] | 40 | #if 0 |
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[a32b204] | 41 | void |
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| 42 | printAlts( const AltList &list, std::ostream &os, int indent = 0 ) |
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| 43 | { |
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| 44 | for ( AltList::const_iterator i = list.begin(); i != list.end(); ++i ) { |
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| 45 | i->print( os, indent ); |
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| 46 | os << std::endl; |
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| 47 | } |
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| 48 | } |
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[51b7345] | 49 | #endif |
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[a08ba92] | 50 | } |
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[51b7345] | 51 | |
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[0f6a7752] | 52 | class ResolveTypeof_old : public WithShortCircuiting { |
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[a08ba92] | 53 | public: |
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[0f6a7752] | 54 | ResolveTypeof_old( const SymTab::Indexer &indexer ) : indexer( indexer ) {} |
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[9d79f93] | 55 | void premutate( TypeofType *typeofType ); |
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| 56 | Type * postmutate( TypeofType *typeofType ); |
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[51b7345] | 57 | |
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[a08ba92] | 58 | private: |
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[a32b204] | 59 | const SymTab::Indexer &indexer; |
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[a08ba92] | 60 | }; |
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[51b7345] | 61 | |
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[9d79f93] | 62 | Type * resolveTypeof( Type *type, const SymTab::Indexer &indexer ) { |
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[0f6a7752] | 63 | PassVisitor<ResolveTypeof_old> mutator( indexer ); |
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[a32b204] | 64 | return type->acceptMutator( mutator ); |
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[a08ba92] | 65 | } |
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[51b7345] | 66 | |
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[0f6a7752] | 67 | void ResolveTypeof_old::premutate( TypeofType * ) { |
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[9d79f93] | 68 | visit_children = false; |
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| 69 | } |
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| 70 | |
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[0f6a7752] | 71 | Type * ResolveTypeof_old::postmutate( TypeofType *typeofType ) { |
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[d9a0e76] | 72 | #if 0 |
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[9d79f93] | 73 | std::cerr << "resolving typeof: "; |
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| 74 | typeofType->print( std::cerr ); |
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| 75 | std::cerr << std::endl; |
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[d9a0e76] | 76 | #endif |
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[f441c88] | 77 | // pass on null expression |
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| 78 | if ( ! typeofType->expr ) return typeofType; |
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| 79 | |
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| 80 | bool isBasetypeof = typeofType->is_basetypeof; |
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| 81 | auto oldQuals = typeofType->get_qualifiers().val; |
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| 82 | |
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| 83 | Type* newType; |
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| 84 | if ( TypeExpr* tyExpr = dynamic_cast<TypeExpr*>(typeofType->expr) ) { |
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| 85 | // typeof wrapping type |
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| 86 | newType = tyExpr->type; |
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| 87 | tyExpr->type = nullptr; |
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| 88 | delete tyExpr; |
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| 89 | } else { |
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| 90 | // typeof wrapping expression |
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[9d79f93] | 91 | Expression * newExpr = resolveInVoidContext( typeofType->expr, indexer ); |
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| 92 | assert( newExpr->result && ! newExpr->result->isVoid() ); |
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[f441c88] | 93 | newType = newExpr->result; |
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[9d79f93] | 94 | newExpr->result = nullptr; |
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[a32b204] | 95 | delete typeofType; |
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[c93bc28] | 96 | delete newExpr; |
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[f441c88] | 97 | } |
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| 98 | |
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| 99 | // clear qualifiers for base, combine with typeoftype quals in any case |
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| 100 | if ( isBasetypeof ) { |
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[8e04794] | 101 | // replace basetypeof(<enum>) by int |
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| 102 | if ( dynamic_cast<EnumInstType*>(newType) ) { |
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[a6f26ca] | 103 | Type* newerType = |
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| 104 | new BasicType{ newType->get_qualifiers(), BasicType::SignedInt, |
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[8e04794] | 105 | newType->attributes }; |
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| 106 | delete newType; |
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| 107 | newType = newerType; |
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| 108 | } |
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[a6f26ca] | 109 | newType->get_qualifiers().val |
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[f441c88] | 110 | = ( newType->get_qualifiers().val & ~Type::Qualifiers::Mask ) | oldQuals; |
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| 111 | } else { |
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| 112 | newType->get_qualifiers().val |= oldQuals; |
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| 113 | } |
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[a6f26ca] | 114 | |
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[f441c88] | 115 | return newType; |
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[a08ba92] | 116 | } |
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[c8e4d2f8] | 117 | |
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[0f6a7752] | 118 | namespace { |
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| 119 | struct ResolveTypeof_new : public ast::WithShortCircuiting { |
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| 120 | const ast::SymbolTable & localSymtab; |
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| 121 | |
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| 122 | ResolveTypeof_new( const ast::SymbolTable & syms ) : localSymtab( syms ) {} |
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| 123 | |
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[a6f26ca] | 124 | void previsit( const ast::TypeofType * ) { visit_children = false; } |
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[0f6a7752] | 125 | |
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[a6f26ca] | 126 | const ast::Type * postvisit( const ast::TypeofType * typeofType ) { |
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[0f6a7752] | 127 | // pass on null expression |
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| 128 | if ( ! typeofType->expr ) return typeofType; |
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| 129 | |
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| 130 | ast::ptr< ast::Type > newType; |
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| 131 | if ( auto tyExpr = typeofType->expr.as< ast::TypeExpr >() ) { |
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| 132 | // typeof wrapping type |
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| 133 | newType = tyExpr->type; |
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| 134 | } else { |
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| 135 | // typeof wrapping expression |
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| 136 | ast::TypeEnvironment dummy; |
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[a6f26ca] | 137 | ast::ptr< ast::Expr > newExpr = |
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[0f6a7752] | 138 | resolveInVoidContext( typeofType->expr, localSymtab, dummy ); |
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| 139 | assert( newExpr->result && ! newExpr->result->isVoid() ); |
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| 140 | newType = newExpr->result; |
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| 141 | } |
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| 142 | |
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| 143 | // clear qualifiers for base, combine with typeoftype quals regardless |
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| 144 | if ( typeofType->kind == ast::TypeofType::Basetypeof ) { |
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| 145 | // replace basetypeof(<enum>) by int |
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| 146 | if ( newType.as< ast::EnumInstType >() ) { |
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[a6f26ca] | 147 | newType = new ast::BasicType{ |
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[0f6a7752] | 148 | ast::BasicType::SignedInt, newType->qualifiers, copy(newType->attributes) }; |
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| 149 | } |
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[a6f26ca] | 150 | reset_qualifiers( |
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| 151 | newType, |
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[0f6a7752] | 152 | ( newType->qualifiers & ~ast::CV::EquivQualifiers ) | typeofType->qualifiers ); |
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| 153 | } else { |
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| 154 | add_qualifiers( newType, typeofType->qualifiers ); |
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| 155 | } |
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| 156 | |
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[417117e] | 157 | return newType.release(); |
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[0f6a7752] | 158 | } |
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| 159 | }; |
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| 160 | } // anonymous namespace |
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| 161 | |
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| 162 | const ast::Type * resolveTypeof( const ast::Type * type , const ast::SymbolTable & symtab ) { |
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| 163 | ast::Pass< ResolveTypeof_new > mutator{ symtab }; |
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| 164 | return type->accept( mutator ); |
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| 165 | } |
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| 166 | |
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[0dd9a5e] | 167 | struct FixArrayDimension { |
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| 168 | // should not require a mutable symbol table - prevent pass template instantiation |
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| 169 | const ast::SymbolTable & _symtab; |
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| 170 | FixArrayDimension(const ast::SymbolTable & symtab): _symtab(symtab) {} |
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| 171 | |
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| 172 | const ast::ArrayType * previsit (const ast::ArrayType * arrayType) { |
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| 173 | if (!arrayType->dimension) return arrayType; |
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| 174 | auto mutType = mutate(arrayType); |
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| 175 | ast::ptr<ast::Type> sizetype = ast::sizeType ? ast::sizeType : new ast::BasicType(ast::BasicType::LongUnsignedInt); |
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| 176 | mutType->dimension = findSingleExpression(arrayType->dimension, sizetype, _symtab); |
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| 177 | |
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| 178 | if (InitTweak::isConstExpr(mutType->dimension)) { |
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| 179 | mutType->isVarLen = ast::LengthFlag::FixedLen; |
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| 180 | } |
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| 181 | else { |
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| 182 | mutType->isVarLen = ast::LengthFlag::VariableLen; |
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| 183 | } |
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| 184 | return mutType; |
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| 185 | } |
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| 186 | }; |
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| 187 | |
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| 188 | const ast::Type * fixArrayType( const ast::Type * type, const ast::SymbolTable & symtab) { |
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| 189 | ast::Pass<FixArrayDimension> visitor {symtab}; |
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| 190 | return type->accept(visitor); |
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| 191 | } |
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| 192 | |
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[16ba4a6] | 193 | const ast::ObjectDecl * fixObjectType( const ast::ObjectDecl * decl , const ast::SymbolTable & symtab ) { |
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| 194 | if (!decl->isTypeFixed) { |
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| 195 | auto mutDecl = mutate(decl); |
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| 196 | auto resolvedType = resolveTypeof(decl->type, symtab); |
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[0dd9a5e] | 197 | resolvedType = fixArrayType(resolvedType, symtab); |
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[16ba4a6] | 198 | mutDecl->type = resolvedType; |
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| 199 | |
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| 200 | // check variable length if object is an array. |
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| 201 | // xxx - should this be part of fixObjectType? |
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[0dd9a5e] | 202 | |
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| 203 | /* |
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[16ba4a6] | 204 | if (auto arrayType = dynamic_cast<const ast::ArrayType *>(resolvedType)) { |
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[0dd9a5e] | 205 | auto dimExpr = findSingleExpression(arrayType->dimension, ast::sizeType, symtab); |
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[16ba4a6] | 206 | if (auto varexpr = arrayType->dimension.as<ast::VariableExpr>()) {// hoisted previously |
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| 207 | if (InitTweak::isConstExpr(varexpr->var.strict_as<ast::ObjectDecl>()->init)) { |
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| 208 | auto mutType = mutate(arrayType); |
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| 209 | mutType->isVarLen = ast::LengthFlag::VariableLen; |
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| 210 | mutDecl->type = mutType; |
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| 211 | } |
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| 212 | } |
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| 213 | } |
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[0dd9a5e] | 214 | */ |
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| 215 | |
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[16ba4a6] | 216 | |
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| 217 | if (!mutDecl->name.empty()) |
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| 218 | mutDecl->mangleName = Mangle::mangle(mutDecl); // do not mangle unnamed variables |
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| 219 | |
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| 220 | mutDecl->isTypeFixed = true; |
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| 221 | return mutDecl; |
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| 222 | } |
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| 223 | return decl; |
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| 224 | } |
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| 225 | |
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[51b7345] | 226 | } // namespace ResolvExpr |
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[a32b204] | 227 | |
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| 228 | // Local Variables: // |
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| 229 | // tab-width: 4 // |
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| 230 | // mode: c++ // |
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| 231 | // compile-command: "make install" // |
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| 232 | // End: // |
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