[54e41b3] | 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 | // Expr.cpp -- |
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| 8 | // |
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| 9 | // Author : Aaron B. Moss |
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| 10 | // Created On : Wed May 15 17:00:00 2019 |
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[d76f32c] | 11 | // Last Modified By : Andrew Beach |
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| 12 | // Created On : Thr Jun 13 13:38:00 2019 |
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| 13 | // Update Count : 2 |
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[54e41b3] | 14 | // |
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| 15 | |
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| 16 | #include "Expr.hpp" |
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| 17 | |
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| 18 | #include <cassert> // for strict_dynamic_cast |
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| 19 | #include <string> // for to_string |
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| 20 | #include <vector> |
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| 21 | |
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[2890212] | 22 | #include "Copy.hpp" // for shallowCopy |
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[417117e] | 23 | #include "Eval.hpp" // for call |
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[d8938622] | 24 | #include "GenericSubstitution.hpp" |
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[9b4f329] | 25 | #include "Stmt.hpp" |
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[54e41b3] | 26 | #include "Type.hpp" |
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[d8938622] | 27 | #include "TypeSubstitution.hpp" |
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[733074e] | 28 | #include "Common/utility.h" |
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[54e41b3] | 29 | #include "Common/SemanticError.h" |
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| 30 | #include "GenPoly/Lvalue.h" // for referencesPermissable |
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| 31 | #include "InitTweak/InitTweak.h" // for getPointerBase |
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| 32 | #include "ResolvExpr/typeops.h" // for extractResultType |
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[9b4f329] | 33 | #include "Tuples/Tuples.h" // for makeTupleType |
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[54e41b3] | 34 | |
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| 35 | namespace ast { |
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| 36 | |
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| 37 | // --- ApplicationExpr |
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| 38 | |
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[87701b6] | 39 | ApplicationExpr::ApplicationExpr( const CodeLocation & loc, const Expr * f, |
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| 40 | std::vector<ptr<Expr>> && as ) |
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| 41 | : Expr( loc ), func( f ), args( std::move(as) ) { |
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[54e41b3] | 42 | // ensure that `ApplicationExpr` result type is `FuncExpr` |
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| 43 | const PointerType * pt = strict_dynamic_cast< const PointerType * >( f->result.get() ); |
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| 44 | const FunctionType * fn = strict_dynamic_cast< const FunctionType * >( pt->base.get() ); |
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| 45 | |
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| 46 | result = ResolvExpr::extractResultType( fn ); |
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| 47 | assert( result ); |
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| 48 | } |
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| 49 | |
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| 50 | // --- UntypedExpr |
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| 51 | |
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| 52 | UntypedExpr * UntypedExpr::createDeref( const CodeLocation & loc, Expr * arg ) { |
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| 53 | assert( arg ); |
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| 54 | |
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[417117e] | 55 | UntypedExpr * ret = call( loc, "*?", arg ); |
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[54e41b3] | 56 | if ( const Type * ty = arg->result ) { |
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| 57 | const Type * base = InitTweak::getPointerBase( ty ); |
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| 58 | assertf( base, "expected pointer type in dereference (type was %s)", toString( ty ).c_str() ); |
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| 59 | |
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| 60 | if ( GenPoly::referencesPermissable() ) { |
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| 61 | // if references are still allowed in the AST, dereference returns a reference |
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| 62 | ret->result = new ReferenceType{ base }; |
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| 63 | } else { |
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[87701b6] | 64 | // references have been removed, in which case dereference returns an lvalue of the |
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[54e41b3] | 65 | // base type |
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[d76c588] | 66 | ret->result = base; |
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[ee574a2] | 67 | add_qualifiers( ret->result, CV::Lvalue ); |
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[54e41b3] | 68 | } |
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| 69 | } |
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| 70 | return ret; |
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| 71 | } |
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| 72 | |
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| 73 | UntypedExpr * UntypedExpr::createAssign( const CodeLocation & loc, Expr * lhs, Expr * rhs ) { |
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| 74 | assert( lhs && rhs ); |
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| 75 | |
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[417117e] | 76 | UntypedExpr * ret = call( loc, "?=?", lhs, rhs ); |
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[54e41b3] | 77 | if ( lhs->result && rhs->result ) { |
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| 78 | // if both expressions are typed, assumes that this assignment is a C bitwise assignment, |
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| 79 | // so the result is the type of the RHS |
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| 80 | ret->result = rhs->result; |
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| 81 | } |
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| 82 | return ret; |
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| 83 | } |
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| 84 | |
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| 85 | // --- AddressExpr |
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| 86 | |
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| 87 | // Address expressions are typed based on the following inference rules: |
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| 88 | // E : lvalue T &..& (n references) |
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| 89 | // &E : T *&..& (n references) |
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| 90 | // |
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| 91 | // E : T &..& (m references) |
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| 92 | // &E : T *&..& (m-1 references) |
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| 93 | |
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| 94 | namespace { |
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| 95 | /// The type of the address of a type. |
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| 96 | /// Caller is responsible for managing returned memory |
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| 97 | Type * addrType( const Type * type ) { |
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| 98 | if ( const ReferenceType * refType = dynamic_cast< const ReferenceType * >( type ) ) { |
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| 99 | return new ReferenceType{ addrType( refType->base ), refType->qualifiers }; |
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| 100 | } else { |
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| 101 | return new PointerType{ type }; |
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| 102 | } |
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| 103 | } |
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| 104 | } |
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| 105 | |
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| 106 | AddressExpr::AddressExpr( const CodeLocation & loc, const Expr * a ) : Expr( loc ), arg( a ) { |
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| 107 | if ( arg->result ) { |
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| 108 | if ( arg->result->is_lvalue() ) { |
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| 109 | // lvalue, retains all levels of reference, and gains a pointer inside the references |
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| 110 | Type * res = addrType( arg->result ); |
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| 111 | res->set_lvalue( false ); // result of & is never an lvalue |
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| 112 | result = res; |
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| 113 | } else { |
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| 114 | // taking address of non-lvalue, must be a reference, loses one layer of reference |
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[87701b6] | 115 | if ( const ReferenceType * refType = |
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[54e41b3] | 116 | dynamic_cast< const ReferenceType * >( arg->result.get() ) ) { |
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| 117 | Type * res = addrType( refType->base ); |
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| 118 | res->set_lvalue( false ); // result of & is never an lvalue |
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| 119 | result = res; |
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| 120 | } else { |
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[10a1225] | 121 | SemanticError( loc, arg->result.get(), |
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[54e41b3] | 122 | "Attempt to take address of non-lvalue expression: " ); |
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| 123 | } |
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| 124 | } |
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| 125 | } |
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| 126 | } |
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| 127 | |
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| 128 | // --- LabelAddressExpr |
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| 129 | |
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| 130 | // label address always has type `void*` |
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[87701b6] | 131 | LabelAddressExpr::LabelAddressExpr( const CodeLocation & loc, Label && a ) |
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[54e41b3] | 132 | : Expr( loc, new PointerType{ new VoidType{} } ), arg( a ) {} |
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| 133 | |
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| 134 | // --- CastExpr |
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| 135 | |
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[87701b6] | 136 | CastExpr::CastExpr( const CodeLocation & loc, const Expr * a, GeneratedFlag g ) |
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[54e41b3] | 137 | : Expr( loc, new VoidType{} ), arg( a ), isGenerated( g ) {} |
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| 138 | |
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| 139 | // --- KeywordCastExpr |
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| 140 | |
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| 141 | const std::string & KeywordCastExpr::targetString() const { |
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| 142 | static const std::string targetStrs[] = { |
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| 143 | "coroutine", "thread", "monitor" |
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| 144 | }; |
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| 145 | static_assert( |
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| 146 | (sizeof(targetStrs) / sizeof(targetStrs[0])) == ((unsigned long)NUMBER_OF_TARGETS), |
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| 147 | "Each KeywordCastExpr::Target should have a corresponding string representation" |
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| 148 | ); |
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| 149 | return targetStrs[(unsigned long)target]; |
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| 150 | } |
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| 151 | |
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| 152 | // --- MemberExpr |
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| 153 | |
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| 154 | MemberExpr::MemberExpr( const CodeLocation & loc, const DeclWithType * mem, const Expr * agg ) |
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| 155 | : Expr( loc ), member( mem ), aggregate( agg ) { |
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| 156 | assert( member ); |
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| 157 | assert( aggregate ); |
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| 158 | assert( aggregate->result ); |
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| 159 | |
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[ae265b55] | 160 | // Deep copy on result type avoids mutation on transitively multiply referenced object. |
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| 161 | // |
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| 162 | // Example, adapted from parts of builtins and bootloader: |
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| 163 | // |
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| 164 | // forall(dtype T) |
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| 165 | // struct __Destructor { |
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| 166 | // T * object; |
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| 167 | // void (*dtor)(T *); |
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| 168 | // }; |
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| 169 | // |
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| 170 | // forall(dtype S) |
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| 171 | // void foo(__Destructor(S) &d) { |
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| 172 | // if (d.dtor) { // here |
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| 173 | // } |
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| 174 | // } |
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| 175 | // |
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| 176 | // Let e be the "d.dtor" guard espression, which is MemberExpr after resolve. Let d be the |
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| 177 | // declaration of member __Destructor.dtor (an ObjectDecl), as accessed via the top-level |
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| 178 | // declaration of __Destructor. Consider the types e.result and d.type. In the old AST, one |
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| 179 | // is a clone of the other. Ordinary new-AST use would set them up as a multiply-referenced |
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| 180 | // object. |
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| 181 | // |
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| 182 | // e.result: PointerType |
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| 183 | // .base: FunctionType |
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| 184 | // .params.front(): ObjectDecl, the anonymous parameter of type T* |
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| 185 | // .type: PointerType |
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| 186 | // .base: TypeInstType |
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| 187 | // let x = that |
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| 188 | // let y = similar, except start from d.type |
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| 189 | // |
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| 190 | // Consider two code lines down, genericSubstitution(...).apply(result). |
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| 191 | // |
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| 192 | // Applying this chosen-candidate's type substitution means modifying x, substituting |
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| 193 | // S for T. This mutation should affect x and not y. |
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| 194 | |
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| 195 | result = deepCopy(mem->get_type()); |
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| 196 | |
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[335f2d8] | 197 | // substitute aggregate generic parameters into member type |
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[60aaa51d] | 198 | genericSubstitution( aggregate->result ).apply( result ); |
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[335f2d8] | 199 | // ensure lvalue and appropriate restrictions from aggregate type |
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[ee574a2] | 200 | add_qualifiers( result, aggregate->result->qualifiers | CV::Lvalue ); |
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[54e41b3] | 201 | } |
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| 202 | |
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[ae265b55] | 203 | MemberExpr::MemberExpr( const CodeLocation & loc, const DeclWithType * mem, const Expr * agg, |
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| 204 | MemberExpr::NoOpConstruction overloadSelector ) |
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| 205 | : Expr( loc ), member( mem ), aggregate( agg ) { |
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| 206 | assert( member ); |
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| 207 | assert( aggregate ); |
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| 208 | assert( aggregate->result ); |
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| 209 | (void) overloadSelector; |
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| 210 | } |
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| 211 | |
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[54e41b3] | 212 | // --- VariableExpr |
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| 213 | |
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[546e712] | 214 | VariableExpr::VariableExpr( const CodeLocation & loc ) |
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| 215 | : Expr( loc ), var( nullptr ) {} |
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| 216 | |
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[54e41b3] | 217 | VariableExpr::VariableExpr( const CodeLocation & loc, const DeclWithType * v ) |
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| 218 | : Expr( loc ), var( v ) { |
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| 219 | assert( var ); |
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| 220 | assert( var->get_type() ); |
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[2890212] | 221 | auto r = shallowCopy( var->get_type() ); |
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| 222 | r->qualifiers |= CV::Lvalue; |
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| 223 | result = r; |
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[54e41b3] | 224 | } |
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| 225 | |
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[87701b6] | 226 | VariableExpr * VariableExpr::functionPointer( |
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[54e41b3] | 227 | const CodeLocation & loc, const FunctionDecl * decl ) { |
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| 228 | // wrap usually-determined result type in a pointer |
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| 229 | VariableExpr * funcExpr = new VariableExpr{ loc, decl }; |
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| 230 | funcExpr->result = new PointerType{ funcExpr->result }; |
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| 231 | return funcExpr; |
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| 232 | } |
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| 233 | |
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| 234 | // --- ConstantExpr |
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| 235 | |
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| 236 | long long int ConstantExpr::intValue() const { |
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| 237 | if ( const BasicType * bty = result.as< BasicType >() ) { |
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| 238 | if ( bty->isInteger() ) { |
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[c36298d] | 239 | assert(ival); |
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| 240 | return ival.value(); |
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[54e41b3] | 241 | } |
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| 242 | } else if ( result.as< ZeroType >() ) { |
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| 243 | return 0; |
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| 244 | } else if ( result.as< OneType >() ) { |
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| 245 | return 1; |
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| 246 | } |
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| 247 | SemanticError( this, "Constant expression of non-integral type " ); |
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| 248 | } |
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| 249 | |
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| 250 | ConstantExpr * ConstantExpr::from_bool( const CodeLocation & loc, bool b ) { |
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[87701b6] | 251 | return new ConstantExpr{ |
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[54e41b3] | 252 | loc, new BasicType{ BasicType::Bool }, b ? "1" : "0", (unsigned long long)b }; |
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| 253 | } |
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| 254 | |
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| 255 | ConstantExpr * ConstantExpr::from_int( const CodeLocation & loc, int i ) { |
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[87701b6] | 256 | return new ConstantExpr{ |
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[54e41b3] | 257 | loc, new BasicType{ BasicType::SignedInt }, std::to_string( i ), (unsigned long long)i }; |
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| 258 | } |
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| 259 | |
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| 260 | ConstantExpr * ConstantExpr::from_ulong( const CodeLocation & loc, unsigned long i ) { |
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[87701b6] | 261 | return new ConstantExpr{ |
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| 262 | loc, new BasicType{ BasicType::LongUnsignedInt }, std::to_string( i ), |
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[54e41b3] | 263 | (unsigned long long)i }; |
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| 264 | } |
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| 265 | |
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| 266 | ConstantExpr * ConstantExpr::null( const CodeLocation & loc, const Type * ptrType ) { |
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| 267 | return new ConstantExpr{ |
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| 268 | loc, ptrType ? ptrType : new PointerType{ new VoidType{} }, "0", (unsigned long long)0 }; |
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| 269 | } |
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| 270 | |
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| 271 | // --- SizeofExpr |
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| 272 | |
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| 273 | SizeofExpr::SizeofExpr( const CodeLocation & loc, const Expr * e ) |
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| 274 | : Expr( loc, new BasicType{ BasicType::LongUnsignedInt } ), expr( e ), type( nullptr ) {} |
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| 275 | |
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| 276 | SizeofExpr::SizeofExpr( const CodeLocation & loc, const Type * t ) |
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| 277 | : Expr( loc, new BasicType{ BasicType::LongUnsignedInt } ), expr( nullptr ), type( t ) {} |
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| 278 | |
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| 279 | // --- AlignofExpr |
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| 280 | |
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| 281 | AlignofExpr::AlignofExpr( const CodeLocation & loc, const Expr * e ) |
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| 282 | : Expr( loc, new BasicType{ BasicType::LongUnsignedInt } ), expr( e ), type( nullptr ) {} |
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| 283 | |
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| 284 | AlignofExpr::AlignofExpr( const CodeLocation & loc, const Type * t ) |
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| 285 | : Expr( loc, new BasicType{ BasicType::LongUnsignedInt } ), expr( nullptr ), type( t ) {} |
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| 286 | |
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| 287 | // --- OffsetofExpr |
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| 288 | |
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| 289 | OffsetofExpr::OffsetofExpr( const CodeLocation & loc, const Type * ty, const DeclWithType * mem ) |
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| 290 | : Expr( loc, new BasicType{ BasicType::LongUnsignedInt } ), type( ty ), member( mem ) { |
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| 291 | assert( type ); |
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| 292 | assert( member ); |
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| 293 | } |
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| 294 | |
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| 295 | // --- OffsetPackExpr |
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| 296 | |
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| 297 | OffsetPackExpr::OffsetPackExpr( const CodeLocation & loc, const StructInstType * ty ) |
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[87701b6] | 298 | : Expr( loc, new ArrayType{ |
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| 299 | new BasicType{ BasicType::LongUnsignedInt }, nullptr, FixedLen, DynamicDim } |
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[54e41b3] | 300 | ), type( ty ) { |
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| 301 | assert( type ); |
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| 302 | } |
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| 303 | |
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| 304 | // --- LogicalExpr |
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| 305 | |
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[87701b6] | 306 | LogicalExpr::LogicalExpr( |
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[54e41b3] | 307 | const CodeLocation & loc, const Expr * a1, const Expr * a2, LogicalFlag ia ) |
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| 308 | : Expr( loc, new BasicType{ BasicType::SignedInt } ), arg1( a1 ), arg2( a2 ), isAnd( ia ) {} |
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| 309 | |
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[9b4f329] | 310 | // --- ConstructorExpr |
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| 311 | |
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[10a1225] | 312 | ConstructorExpr::ConstructorExpr( const CodeLocation & loc, const Expr * call ) |
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[9b4f329] | 313 | : Expr( loc ), callExpr( call ) { |
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[10a1225] | 314 | // allow resolver to type a constructor used as an expression if it has the same type as its |
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[9b4f329] | 315 | // first argument |
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| 316 | assert( callExpr ); |
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| 317 | const Expr * arg = InitTweak::getCallArg( callExpr, 0 ); |
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| 318 | assert( arg ); |
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| 319 | result = arg->result; |
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| 320 | } |
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| 321 | |
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| 322 | // --- CompoundLiteralExpr |
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| 323 | |
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| 324 | CompoundLiteralExpr::CompoundLiteralExpr( const CodeLocation & loc, const Type * t, const Init * i ) |
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| 325 | : Expr( loc ), init( i ) { |
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| 326 | assert( t && i ); |
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[d76c588] | 327 | result = t; |
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[ee574a2] | 328 | add_qualifiers( result, CV::Lvalue ); |
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[9b4f329] | 329 | } |
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| 330 | |
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| 331 | // --- TupleExpr |
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| 332 | |
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| 333 | TupleExpr::TupleExpr( const CodeLocation & loc, std::vector<ptr<Expr>> && xs ) |
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| 334 | : Expr( loc, Tuples::makeTupleType( xs ) ), exprs( xs ) {} |
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| 335 | |
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| 336 | // --- TupleIndexExpr |
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| 337 | |
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| 338 | TupleIndexExpr::TupleIndexExpr( const CodeLocation & loc, const Expr * t, unsigned i ) |
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| 339 | : Expr( loc ), tuple( t ), index( i ) { |
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[10a1225] | 340 | const TupleType * type = strict_dynamic_cast< const TupleType * >( tuple->result.get() ); |
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[9b4f329] | 341 | assertf( type->size() > index, "TupleIndexExpr index out of bounds: tuple size %d, requested " |
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| 342 | "index %d in expr %s", type->size(), index, toString( tuple ).c_str() ); |
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| 343 | // like MemberExpr, TupleIndexExpr is always an lvalue |
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[d76c588] | 344 | result = type->types[ index ]; |
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[ee574a2] | 345 | add_qualifiers( result, CV::Lvalue ); |
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[9b4f329] | 346 | } |
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| 347 | |
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| 348 | // --- TupleAssignExpr |
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| 349 | |
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[10a1225] | 350 | TupleAssignExpr::TupleAssignExpr( |
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| 351 | const CodeLocation & loc, std::vector<ptr<Expr>> && assigns, |
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[9b4f329] | 352 | std::vector<ptr<ObjectDecl>> && tempDecls ) |
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| 353 | : Expr( loc, Tuples::makeTupleType( assigns ) ), stmtExpr() { |
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[10a1225] | 354 | // convert internally into a StmtExpr which contains the declarations and produces the tuple of |
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[9b4f329] | 355 | // the assignments |
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| 356 | std::list<ptr<Stmt>> stmts; |
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| 357 | for ( const ObjectDecl * obj : tempDecls ) { |
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| 358 | stmts.emplace_back( new DeclStmt{ loc, obj } ); |
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| 359 | } |
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| 360 | TupleExpr * tupleExpr = new TupleExpr{ loc, std::move(assigns) }; |
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| 361 | assert( tupleExpr->result ); |
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| 362 | stmts.emplace_back( new ExprStmt{ loc, tupleExpr } ); |
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| 363 | stmtExpr = new StmtExpr{ loc, new CompoundStmt{ loc, std::move(stmts) } }; |
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| 364 | } |
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| 365 | |
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[0b57626] | 366 | TupleAssignExpr::TupleAssignExpr( |
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[20de6fb] | 367 | const CodeLocation & loc, const Type * result, const StmtExpr * s ) |
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| 368 | : Expr( loc, result ), stmtExpr() { |
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| 369 | stmtExpr = s; |
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| 370 | } |
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| 371 | |
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[9b4f329] | 372 | // --- StmtExpr |
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| 373 | |
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[10a1225] | 374 | StmtExpr::StmtExpr( const CodeLocation & loc, const CompoundStmt * ss ) |
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[9b4f329] | 375 | : Expr( loc ), stmts( ss ), returnDecls(), dtors() { computeResult(); } |
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| 376 | |
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| 377 | void StmtExpr::computeResult() { |
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| 378 | assert( stmts ); |
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| 379 | const std::list<ptr<Stmt>> & body = stmts->kids; |
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| 380 | if ( ! returnDecls.empty() ) { |
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[10a1225] | 381 | // prioritize return decl for result type, since if a return decl exists, then the StmtExpr |
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[9b4f329] | 382 | // is currently in an intermediate state where the body will always give a void result type |
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| 383 | result = returnDecls.front()->get_type(); |
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| 384 | } else if ( ! body.empty() ) { |
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| 385 | if ( const ExprStmt * exprStmt = body.back().as< ExprStmt >() ) { |
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| 386 | result = exprStmt->expr->result; |
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| 387 | } |
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| 388 | } |
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| 389 | // ensure a result type exists |
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| 390 | if ( ! result ) { result = new VoidType{}; } |
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| 391 | } |
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| 392 | |
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| 393 | // --- UniqueExpr |
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| 394 | |
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| 395 | unsigned long long UniqueExpr::nextId = 0; |
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| 396 | |
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[10a1225] | 397 | UniqueExpr::UniqueExpr( const CodeLocation & loc, const Expr * e, unsigned long long i ) |
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[d76f32c] | 398 | : Expr( loc, e->result ), expr( e ), id( i ) { |
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[9b4f329] | 399 | assert( expr ); |
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[10a1225] | 400 | if ( id == -1ull ) { |
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| 401 | assert( nextId != -1ull ); |
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[9b4f329] | 402 | id = nextId++; |
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| 403 | } |
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[54e41b3] | 404 | } |
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| 405 | |
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[10a1225] | 406 | } |
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| 407 | |
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[54e41b3] | 408 | // Local Variables: // |
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| 409 | // tab-width: 4 // |
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| 410 | // mode: c++ // |
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| 411 | // compile-command: "make install" // |
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[d76f32c] | 412 | // End: // |
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