[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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[b1f2007] | 11 | // Last Modified By : Peter A. Buhr |
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[e6cf857f] | 12 | // Created On : Wed May 18 13:56:00 2022 |
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[b1f2007] | 13 | // Update Count : 12 |
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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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[d8938622] | 23 | #include "GenericSubstitution.hpp" |
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[e01eb4a] | 24 | #include "Inspect.hpp" |
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[cf32116] | 25 | #include "LinkageSpec.hpp" |
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[9b4f329] | 26 | #include "Stmt.hpp" |
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[54e41b3] | 27 | #include "Type.hpp" |
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[d8938622] | 28 | #include "TypeSubstitution.hpp" |
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[c92bdcc] | 29 | #include "Common/Utility.hpp" |
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| 30 | #include "Common/SemanticError.hpp" |
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| 31 | #include "GenPoly/Lvalue.hpp" // for referencesPermissable |
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| 32 | #include "ResolvExpr/Unify.hpp" // for extractResultType |
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| 33 | #include "Tuples/Tuples.hpp" // for makeTupleType |
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[54e41b3] | 34 | |
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| 35 | namespace ast { |
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| 36 | |
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[cf32116] | 37 | namespace { |
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| 38 | std::set<std::string> const lvalueFunctionNames = {"*?", "?[?]"}; |
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| 39 | } |
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| 40 | |
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| 41 | // --- Expr |
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| 42 | bool Expr::get_lvalue() const { |
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| 43 | return false; |
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| 44 | } |
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| 45 | |
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[54e41b3] | 46 | // --- ApplicationExpr |
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| 47 | |
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[87701b6] | 48 | ApplicationExpr::ApplicationExpr( const CodeLocation & loc, const Expr * f, |
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| 49 | std::vector<ptr<Expr>> && as ) |
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| 50 | : Expr( loc ), func( f ), args( std::move(as) ) { |
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[54e41b3] | 51 | // ensure that `ApplicationExpr` result type is `FuncExpr` |
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| 52 | const PointerType * pt = strict_dynamic_cast< const PointerType * >( f->result.get() ); |
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| 53 | const FunctionType * fn = strict_dynamic_cast< const FunctionType * >( pt->base.get() ); |
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| 54 | |
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| 55 | result = ResolvExpr::extractResultType( fn ); |
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| 56 | assert( result ); |
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| 57 | } |
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| 58 | |
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[cf32116] | 59 | bool ApplicationExpr::get_lvalue() const { |
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[e01eb4a] | 60 | if ( const DeclWithType * func = getFunction( this ) ) { |
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[cf32116] | 61 | return func->linkage == Linkage::Intrinsic && lvalueFunctionNames.count( func->name ); |
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| 62 | } |
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| 63 | return false; |
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| 64 | } |
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| 65 | |
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[54e41b3] | 66 | // --- UntypedExpr |
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| 67 | |
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[e6cf857f] | 68 | bool UntypedExpr::get_lvalue() const { |
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[e01eb4a] | 69 | std::string fname = getFunctionName( this ); |
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[e6cf857f] | 70 | return lvalueFunctionNames.count( fname ); |
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| 71 | } |
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| 72 | |
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[490fb92e] | 73 | UntypedExpr * UntypedExpr::createDeref( const CodeLocation & loc, const Expr * arg ) { |
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[54e41b3] | 74 | assert( arg ); |
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| 75 | |
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[e6cf857f] | 76 | UntypedExpr * ret = createCall( loc, "*?", { arg } ); |
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[54e41b3] | 77 | if ( const Type * ty = arg->result ) { |
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[e01eb4a] | 78 | const Type * base = getPointerBase( ty ); |
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[54e41b3] | 79 | assertf( base, "expected pointer type in dereference (type was %s)", toString( ty ).c_str() ); |
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| 80 | |
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| 81 | if ( GenPoly::referencesPermissable() ) { |
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| 82 | // if references are still allowed in the AST, dereference returns a reference |
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| 83 | ret->result = new ReferenceType{ base }; |
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| 84 | } else { |
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[87701b6] | 85 | // references have been removed, in which case dereference returns an lvalue of the |
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[54e41b3] | 86 | // base type |
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[d76c588] | 87 | ret->result = base; |
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[54e41b3] | 88 | } |
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| 89 | } |
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| 90 | return ret; |
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| 91 | } |
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| 92 | |
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[490fb92e] | 93 | UntypedExpr * UntypedExpr::createAssign( const CodeLocation & loc, const Expr * lhs, const Expr * rhs ) { |
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[54e41b3] | 94 | assert( lhs && rhs ); |
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| 95 | |
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[e6cf857f] | 96 | UntypedExpr * ret = createCall( loc, "?=?", { lhs, rhs } ); |
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[54e41b3] | 97 | if ( lhs->result && rhs->result ) { |
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| 98 | // if both expressions are typed, assumes that this assignment is a C bitwise assignment, |
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| 99 | // so the result is the type of the RHS |
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| 100 | ret->result = rhs->result; |
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| 101 | } |
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| 102 | return ret; |
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| 103 | } |
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| 104 | |
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[e6cf857f] | 105 | UntypedExpr * UntypedExpr::createCall( const CodeLocation & loc, |
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| 106 | const std::string & name, std::vector<ptr<Expr>> && args ) { |
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| 107 | return new UntypedExpr( loc, |
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| 108 | new NameExpr( loc, name ), std::move( args ) ); |
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| 109 | } |
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| 110 | |
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[d5631b3] | 111 | // --- VariableExpr |
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| 112 | |
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| 113 | VariableExpr::VariableExpr( const CodeLocation & loc ) |
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| 114 | : Expr( loc ), var( nullptr ) {} |
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| 115 | |
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| 116 | VariableExpr::VariableExpr( const CodeLocation & loc, const DeclWithType * v ) |
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| 117 | : Expr( loc ), var( v ) { |
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| 118 | assert( var ); |
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| 119 | assert( var->get_type() ); |
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| 120 | result = shallowCopy( var->get_type() ); |
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| 121 | } |
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| 122 | |
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| 123 | bool VariableExpr::get_lvalue() const { |
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| 124 | // It isn't always an lvalue, but it is never an rvalue. |
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| 125 | return true; |
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| 126 | } |
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| 127 | |
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| 128 | VariableExpr * VariableExpr::functionPointer( |
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| 129 | const CodeLocation & loc, const FunctionDecl * decl ) { |
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| 130 | // wrap usually-determined result type in a pointer |
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| 131 | VariableExpr * funcExpr = new VariableExpr{ loc, decl }; |
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| 132 | funcExpr->result = new PointerType{ funcExpr->result }; |
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| 133 | return funcExpr; |
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| 134 | } |
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| 135 | |
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[54e41b3] | 136 | // --- AddressExpr |
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| 137 | |
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| 138 | // Address expressions are typed based on the following inference rules: |
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| 139 | // E : lvalue T &..& (n references) |
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| 140 | // &E : T *&..& (n references) |
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| 141 | // |
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| 142 | // E : T &..& (m references) |
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| 143 | // &E : T *&..& (m-1 references) |
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| 144 | |
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| 145 | namespace { |
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| 146 | /// The type of the address of a type. |
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| 147 | /// Caller is responsible for managing returned memory |
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[f27331c] | 148 | Type * addrType( const ptr<Type> & type ) { |
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| 149 | if ( auto refType = type.as< ReferenceType >() ) { |
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| 150 | return new ReferenceType( addrType( refType->base ), refType->qualifiers ); |
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[54e41b3] | 151 | } else { |
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[f27331c] | 152 | return new PointerType( type ); |
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[54e41b3] | 153 | } |
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| 154 | } |
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| 155 | |
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[f27331c] | 156 | /// The type of the address of an expression. |
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| 157 | /// Caller is responsible for managing returned memory |
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| 158 | Type * addrExprType( const CodeLocation & loc, const Expr * arg ) { |
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| 159 | assert( arg ); |
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| 160 | // If the expression's type is unknown, the address type is unknown. |
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| 161 | if ( nullptr == arg->result ) { |
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| 162 | return nullptr; |
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| 163 | // An lvalue is transformed directly. |
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| 164 | } else if ( arg->get_lvalue() ) { |
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| 165 | return addrType( arg->result ); |
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| 166 | // Strip a layer of reference to "create" an lvalue expression. |
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| 167 | } else if ( auto refType = arg->result.as< ReferenceType >() ) { |
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| 168 | return addrType( refType->base ); |
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[54e41b3] | 169 | } else { |
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[b1f2007] | 170 | SemanticError( loc, "Attempt to take address of non-lvalue expression %s", |
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| 171 | toString( arg->result.get() ).c_str() ); |
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[54e41b3] | 172 | } |
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| 173 | } |
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| 174 | } |
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| 175 | |
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[f27331c] | 176 | AddressExpr::AddressExpr( const CodeLocation & loc, const Expr * a ) : |
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| 177 | Expr( loc, addrExprType( loc, a ) ), arg( a ) |
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| 178 | {} |
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| 179 | |
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[54e41b3] | 180 | // --- LabelAddressExpr |
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| 181 | |
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| 182 | // label address always has type `void*` |
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[87701b6] | 183 | LabelAddressExpr::LabelAddressExpr( const CodeLocation & loc, Label && a ) |
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[54e41b3] | 184 | : Expr( loc, new PointerType{ new VoidType{} } ), arg( a ) {} |
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| 185 | |
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| 186 | // --- CastExpr |
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| 187 | |
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[46da46b] | 188 | CastExpr::CastExpr( const CodeLocation & loc, const Expr * a, GeneratedFlag g, CastKind kind ) |
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| 189 | : Expr( loc, new VoidType{} ), arg( a ), isGenerated( g ), kind( kind ) {} |
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[54e41b3] | 190 | |
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[cf32116] | 191 | bool CastExpr::get_lvalue() const { |
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| 192 | // This is actually wrong by C, but it works with our current set-up. |
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| 193 | return arg->get_lvalue(); |
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| 194 | } |
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| 195 | |
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[54e41b3] | 196 | // --- KeywordCastExpr |
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| 197 | |
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[312029a] | 198 | const char * KeywordCastExpr::targetString() const { |
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| 199 | return AggregateDecl::aggrString( target ); |
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[54e41b3] | 200 | } |
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| 201 | |
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[cf32116] | 202 | // --- UntypedMemberExpr |
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| 203 | |
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| 204 | bool UntypedMemberExpr::get_lvalue() const { |
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| 205 | return aggregate->get_lvalue(); |
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| 206 | } |
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| 207 | |
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[54e41b3] | 208 | // --- MemberExpr |
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| 209 | |
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| 210 | MemberExpr::MemberExpr( const CodeLocation & loc, const DeclWithType * mem, const Expr * agg ) |
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| 211 | : Expr( loc ), member( mem ), aggregate( agg ) { |
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| 212 | assert( member ); |
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| 213 | assert( aggregate ); |
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| 214 | assert( aggregate->result ); |
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| 215 | |
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[3e5dd913] | 216 | result = mem->get_type(); |
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[ae265b55] | 217 | |
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[335f2d8] | 218 | // substitute aggregate generic parameters into member type |
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[60aaa51d] | 219 | genericSubstitution( aggregate->result ).apply( result ); |
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[3f3bfe5a] | 220 | // ensure appropriate restrictions from aggregate type |
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| 221 | add_qualifiers( result, aggregate->result->qualifiers ); |
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[54e41b3] | 222 | } |
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| 223 | |
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[cf32116] | 224 | bool MemberExpr::get_lvalue() const { |
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| 225 | // This is actually wrong by C, but it works with our current set-up. |
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| 226 | return true; |
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| 227 | } |
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| 228 | |
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[54e41b3] | 229 | // --- ConstantExpr |
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| 230 | |
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| 231 | long long int ConstantExpr::intValue() const { |
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| 232 | if ( const BasicType * bty = result.as< BasicType >() ) { |
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| 233 | if ( bty->isInteger() ) { |
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[c36298d] | 234 | assert(ival); |
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| 235 | return ival.value(); |
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[54e41b3] | 236 | } |
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| 237 | } else if ( result.as< ZeroType >() ) { |
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| 238 | return 0; |
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| 239 | } else if ( result.as< OneType >() ) { |
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| 240 | return 1; |
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| 241 | } |
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[b1f2007] | 242 | SemanticError( this->location, "Constant expression of non-integral type %s", |
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| 243 | toString( this ).c_str() ); |
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[54e41b3] | 244 | } |
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| 245 | |
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| 246 | ConstantExpr * ConstantExpr::from_bool( const CodeLocation & loc, bool b ) { |
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[87701b6] | 247 | return new ConstantExpr{ |
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[7a780ad] | 248 | loc, new BasicType{ BasicKind::Bool }, b ? "1" : "0", (unsigned long long)b }; |
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[54e41b3] | 249 | } |
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| 250 | |
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| 251 | ConstantExpr * ConstantExpr::from_int( const CodeLocation & loc, int i ) { |
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[87701b6] | 252 | return new ConstantExpr{ |
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[7a780ad] | 253 | loc, new BasicType{ BasicKind::SignedInt }, std::to_string( i ), (unsigned long long)i }; |
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[54e41b3] | 254 | } |
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| 255 | |
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| 256 | ConstantExpr * ConstantExpr::from_ulong( const CodeLocation & loc, unsigned long i ) { |
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[87701b6] | 257 | return new ConstantExpr{ |
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[7a780ad] | 258 | loc, new BasicType{ BasicKind::LongUnsignedInt }, std::to_string( i ), |
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[54e41b3] | 259 | (unsigned long long)i }; |
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| 260 | } |
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| 261 | |
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[b91bfde] | 262 | ConstantExpr * ConstantExpr::from_string( const CodeLocation & loc, const std::string & str ) { |
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[7a780ad] | 263 | const Type * charType = new BasicType( BasicKind::Char ); |
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[b91bfde] | 264 | // Adjust the length of the string for the terminator. |
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| 265 | const Expr * strSize = from_ulong( loc, str.size() + 1 ); |
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[6a896b0] | 266 | const Type * strType = new ArrayType( charType, strSize, FixedLen, DynamicDim ); |
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[b91bfde] | 267 | const std::string strValue = "\"" + str + "\""; |
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| 268 | return new ConstantExpr( loc, strType, strValue, std::nullopt ); |
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| 269 | } |
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| 270 | |
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[54e41b3] | 271 | ConstantExpr * ConstantExpr::null( const CodeLocation & loc, const Type * ptrType ) { |
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| 272 | return new ConstantExpr{ |
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| 273 | loc, ptrType ? ptrType : new PointerType{ new VoidType{} }, "0", (unsigned long long)0 }; |
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| 274 | } |
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| 275 | |
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| 276 | // --- SizeofExpr |
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| 277 | |
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| 278 | SizeofExpr::SizeofExpr( const CodeLocation & loc, const Expr * e ) |
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[7a780ad] | 279 | : Expr( loc, new BasicType{ BasicKind::LongUnsignedInt } ), expr( e ), type( nullptr ) {} |
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[54e41b3] | 280 | |
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| 281 | SizeofExpr::SizeofExpr( const CodeLocation & loc, const Type * t ) |
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[7a780ad] | 282 | : Expr( loc, new BasicType{ BasicKind::LongUnsignedInt } ), expr( nullptr ), type( t ) {} |
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[54e41b3] | 283 | |
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| 284 | // --- AlignofExpr |
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| 285 | |
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| 286 | AlignofExpr::AlignofExpr( const CodeLocation & loc, const Expr * e ) |
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[7a780ad] | 287 | : Expr( loc, new BasicType{ BasicKind::LongUnsignedInt } ), expr( e ), type( nullptr ) {} |
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[54e41b3] | 288 | |
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| 289 | AlignofExpr::AlignofExpr( const CodeLocation & loc, const Type * t ) |
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[7a780ad] | 290 | : Expr( loc, new BasicType{ BasicKind::LongUnsignedInt } ), expr( nullptr ), type( t ) {} |
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[54e41b3] | 291 | |
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| 292 | // --- OffsetofExpr |
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| 293 | |
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| 294 | OffsetofExpr::OffsetofExpr( const CodeLocation & loc, const Type * ty, const DeclWithType * mem ) |
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[7a780ad] | 295 | : Expr( loc, new BasicType{ BasicKind::LongUnsignedInt } ), type( ty ), member( mem ) { |
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[54e41b3] | 296 | assert( type ); |
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| 297 | assert( member ); |
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| 298 | } |
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| 299 | |
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| 300 | // --- OffsetPackExpr |
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| 301 | |
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| 302 | OffsetPackExpr::OffsetPackExpr( const CodeLocation & loc, const StructInstType * ty ) |
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[87701b6] | 303 | : Expr( loc, new ArrayType{ |
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[7a780ad] | 304 | new BasicType{ BasicKind::LongUnsignedInt }, nullptr, FixedLen, DynamicDim } |
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[54e41b3] | 305 | ), type( ty ) { |
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| 306 | assert( type ); |
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| 307 | } |
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| 308 | |
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| 309 | // --- LogicalExpr |
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| 310 | |
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[87701b6] | 311 | LogicalExpr::LogicalExpr( |
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[54e41b3] | 312 | const CodeLocation & loc, const Expr * a1, const Expr * a2, LogicalFlag ia ) |
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[7a780ad] | 313 | : Expr( loc, new BasicType{ BasicKind::SignedInt } ), arg1( a1 ), arg2( a2 ), isAnd( ia ) {} |
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[54e41b3] | 314 | |
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[cf32116] | 315 | // --- CommaExpr |
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| 316 | bool CommaExpr::get_lvalue() const { |
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| 317 | // This is wrong by C, but the current implementation uses it. |
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| 318 | // (ex: Specialize, Lvalue and Box) |
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| 319 | return arg2->get_lvalue(); |
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| 320 | } |
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| 321 | |
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[9b4f329] | 322 | // --- ConstructorExpr |
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| 323 | |
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[10a1225] | 324 | ConstructorExpr::ConstructorExpr( const CodeLocation & loc, const Expr * call ) |
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[9b4f329] | 325 | : Expr( loc ), callExpr( call ) { |
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[10a1225] | 326 | // allow resolver to type a constructor used as an expression if it has the same type as its |
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[9b4f329] | 327 | // first argument |
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| 328 | assert( callExpr ); |
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[e01eb4a] | 329 | const Expr * arg = getCallArg( callExpr, 0 ); |
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[9b4f329] | 330 | assert( arg ); |
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| 331 | result = arg->result; |
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| 332 | } |
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| 333 | |
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| 334 | // --- CompoundLiteralExpr |
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| 335 | |
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| 336 | CompoundLiteralExpr::CompoundLiteralExpr( const CodeLocation & loc, const Type * t, const Init * i ) |
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| 337 | : Expr( loc ), init( i ) { |
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| 338 | assert( t && i ); |
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[d76c588] | 339 | result = t; |
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[9b4f329] | 340 | } |
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| 341 | |
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[cf32116] | 342 | bool CompoundLiteralExpr::get_lvalue() const { |
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| 343 | return true; |
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| 344 | } |
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| 345 | |
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[9b4f329] | 346 | // --- TupleExpr |
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| 347 | |
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| 348 | TupleExpr::TupleExpr( const CodeLocation & loc, std::vector<ptr<Expr>> && xs ) |
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| 349 | : Expr( loc, Tuples::makeTupleType( xs ) ), exprs( xs ) {} |
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| 350 | |
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| 351 | // --- TupleIndexExpr |
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| 352 | |
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| 353 | TupleIndexExpr::TupleIndexExpr( const CodeLocation & loc, const Expr * t, unsigned i ) |
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| 354 | : Expr( loc ), tuple( t ), index( i ) { |
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[10a1225] | 355 | const TupleType * type = strict_dynamic_cast< const TupleType * >( tuple->result.get() ); |
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[9b4f329] | 356 | assertf( type->size() > index, "TupleIndexExpr index out of bounds: tuple size %d, requested " |
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| 357 | "index %d in expr %s", type->size(), index, toString( tuple ).c_str() ); |
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| 358 | // like MemberExpr, TupleIndexExpr is always an lvalue |
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[d76c588] | 359 | result = type->types[ index ]; |
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[9b4f329] | 360 | } |
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| 361 | |
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[cf32116] | 362 | bool TupleIndexExpr::get_lvalue() const { |
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| 363 | return tuple->get_lvalue(); |
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| 364 | } |
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| 365 | |
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[9b4f329] | 366 | // --- TupleAssignExpr |
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| 367 | |
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[10a1225] | 368 | TupleAssignExpr::TupleAssignExpr( |
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| 369 | const CodeLocation & loc, std::vector<ptr<Expr>> && assigns, |
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[9b4f329] | 370 | std::vector<ptr<ObjectDecl>> && tempDecls ) |
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| 371 | : Expr( loc, Tuples::makeTupleType( assigns ) ), stmtExpr() { |
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[10a1225] | 372 | // convert internally into a StmtExpr which contains the declarations and produces the tuple of |
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[9b4f329] | 373 | // the assignments |
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| 374 | std::list<ptr<Stmt>> stmts; |
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| 375 | for ( const ObjectDecl * obj : tempDecls ) { |
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| 376 | stmts.emplace_back( new DeclStmt{ loc, obj } ); |
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| 377 | } |
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| 378 | TupleExpr * tupleExpr = new TupleExpr{ loc, std::move(assigns) }; |
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| 379 | assert( tupleExpr->result ); |
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| 380 | stmts.emplace_back( new ExprStmt{ loc, tupleExpr } ); |
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| 381 | stmtExpr = new StmtExpr{ loc, new CompoundStmt{ loc, std::move(stmts) } }; |
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| 382 | } |
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| 383 | |
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| 384 | // --- StmtExpr |
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| 385 | |
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[10a1225] | 386 | StmtExpr::StmtExpr( const CodeLocation & loc, const CompoundStmt * ss ) |
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[9b4f329] | 387 | : Expr( loc ), stmts( ss ), returnDecls(), dtors() { computeResult(); } |
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| 388 | |
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| 389 | void StmtExpr::computeResult() { |
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| 390 | assert( stmts ); |
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| 391 | const std::list<ptr<Stmt>> & body = stmts->kids; |
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| 392 | if ( ! returnDecls.empty() ) { |
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[10a1225] | 393 | // prioritize return decl for result type, since if a return decl exists, then the StmtExpr |
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[9b4f329] | 394 | // is currently in an intermediate state where the body will always give a void result type |
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| 395 | result = returnDecls.front()->get_type(); |
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| 396 | } else if ( ! body.empty() ) { |
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| 397 | if ( const ExprStmt * exprStmt = body.back().as< ExprStmt >() ) { |
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| 398 | result = exprStmt->expr->result; |
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| 399 | } |
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| 400 | } |
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| 401 | // ensure a result type exists |
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| 402 | if ( ! result ) { result = new VoidType{}; } |
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| 403 | } |
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| 404 | |
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| 405 | // --- UniqueExpr |
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| 406 | |
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| 407 | unsigned long long UniqueExpr::nextId = 0; |
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| 408 | |
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[10a1225] | 409 | UniqueExpr::UniqueExpr( const CodeLocation & loc, const Expr * e, unsigned long long i ) |
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[d76f32c] | 410 | : Expr( loc, e->result ), expr( e ), id( i ) { |
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[9b4f329] | 411 | assert( expr ); |
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[10a1225] | 412 | if ( id == -1ull ) { |
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| 413 | assert( nextId != -1ull ); |
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[9b4f329] | 414 | id = nextId++; |
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| 415 | } |
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[54e41b3] | 416 | } |
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| 417 | |
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[10a1225] | 418 | } |
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| 419 | |
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[54e41b3] | 420 | // Local Variables: // |
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| 421 | // tab-width: 4 // |
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| 422 | // mode: c++ // |
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| 423 | // compile-command: "make install" // |
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[d76f32c] | 424 | // End: // |
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