[51587aa] | 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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[01aeade] | 7 | // Lvalue.cc -- |
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[51587aa] | 8 | // |
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| 9 | // Author : Richard C. Bilson |
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| 10 | // Created On : Mon May 18 07:44:20 2015 |
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[01aeade] | 11 | // Last Modified By : Peter A. Buhr |
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| 12 | // Last Modified On : Tue May 19 07:41:33 2015 |
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| 13 | // Update Count : 1 |
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[51587aa] | 14 | // |
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[51b7345] | 15 | |
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| 16 | #include <cassert> |
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| 17 | |
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| 18 | #include "Lvalue.h" |
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| 19 | |
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| 20 | #include "SynTree/Declaration.h" |
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| 21 | #include "SynTree/Type.h" |
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| 22 | #include "SynTree/Expression.h" |
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| 23 | #include "SynTree/Statement.h" |
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| 24 | #include "SynTree/Visitor.h" |
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| 25 | #include "SynTree/Mutator.h" |
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| 26 | #include "SymTab/Indexer.h" |
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| 27 | #include "ResolvExpr/Resolver.h" |
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| 28 | #include "ResolvExpr/typeops.h" |
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| 29 | |
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| 30 | #include "UniqueName.h" |
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| 31 | #include "utility.h" |
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| 32 | |
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| 33 | namespace GenPoly { |
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[01aeade] | 34 | namespace { |
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| 35 | const std::list<Label> noLabels; |
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[51b7345] | 36 | |
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[01aeade] | 37 | class Pass1 : public Mutator { |
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| 38 | public: |
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| 39 | Pass1(); |
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[51b7345] | 40 | |
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[01aeade] | 41 | virtual Expression *mutate( ApplicationExpr *appExpr ); |
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| 42 | virtual Statement *mutate( ReturnStmt *appExpr ); |
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| 43 | virtual DeclarationWithType *mutate( FunctionDecl *funDecl ); |
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| 44 | private: |
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| 45 | DeclarationWithType* retval; |
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| 46 | }; |
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| 47 | |
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| 48 | class Pass2 : public Visitor { |
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| 49 | public: |
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| 50 | virtual void visit( FunctionType *funType ); |
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| 51 | private: |
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| 52 | }; |
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| 53 | } // namespace |
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| 54 | |
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| 55 | void convertLvalue( std::list< Declaration* >& translationUnit ) { |
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| 56 | Pass1 p1; |
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| 57 | Pass2 p2; |
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| 58 | mutateAll( translationUnit, p1 ); |
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| 59 | acceptAll( translationUnit, p2 ); |
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| 60 | } |
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| 61 | |
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| 62 | namespace { |
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| 63 | bool isLvalueRet( FunctionType *function ) { |
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| 64 | if ( ! function->get_returnVals().empty() ) { |
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| 65 | return function->get_returnVals().front()->get_type()->get_isLvalue(); |
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| 66 | } else { |
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| 67 | return false; |
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| 68 | } // if |
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| 69 | } |
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| 70 | |
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| 71 | bool isIntrinsicApp( ApplicationExpr *appExpr ) { |
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| 72 | if ( VariableExpr *varExpr = dynamic_cast< VariableExpr* >( appExpr->get_function() ) ) { |
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| 73 | return varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic; |
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| 74 | } else { |
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| 75 | return false; |
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| 76 | } // if |
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| 77 | } |
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| 78 | |
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| 79 | Pass1::Pass1() { |
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| 80 | } |
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| 81 | |
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| 82 | DeclarationWithType * Pass1::mutate( FunctionDecl *funcDecl ) { |
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| 83 | if ( funcDecl->get_statements() ) { |
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| 84 | DeclarationWithType* oldRetval = retval; |
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| 85 | retval = 0; |
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| 86 | if ( ! LinkageSpec::isBuiltin( funcDecl->get_linkage() ) && isLvalueRet( funcDecl->get_functionType() ) ) { |
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| 87 | retval = funcDecl->get_functionType()->get_returnVals().front(); |
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| 88 | } |
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| 89 | // fix expressions and return statements in this function |
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| 90 | funcDecl->set_statements( funcDecl->get_statements()->acceptMutator( *this ) ); |
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| 91 | retval = oldRetval; |
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| 92 | } // if |
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| 93 | return funcDecl; |
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| 94 | } |
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| 95 | |
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| 96 | Expression * Pass1::mutate( ApplicationExpr *appExpr ) { |
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| 97 | appExpr->get_function()->acceptMutator( *this ); |
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| 98 | mutateAll( appExpr->get_args(), *this ); |
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[51b7345] | 99 | |
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[01aeade] | 100 | assert( ! appExpr->get_function()->get_results().empty() ); |
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| 101 | |
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| 102 | PointerType *pointer = dynamic_cast< PointerType* >( appExpr->get_function()->get_results().front() ); |
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| 103 | assert( pointer ); |
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| 104 | FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ); |
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| 105 | assert( function ); |
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| 106 | |
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| 107 | std::string typeName; |
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| 108 | if ( isLvalueRet( function ) && ! isIntrinsicApp( appExpr ) ) { |
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| 109 | UntypedExpr *deref = new UntypedExpr( new NameExpr( "*?" ) ); |
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| 110 | deref->get_results().push_back( appExpr->get_results().front() ); |
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| 111 | appExpr->get_results().front() = new PointerType( Type::Qualifiers(), deref->get_results().front()->clone() ); |
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| 112 | deref->get_args().push_back( appExpr ); |
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| 113 | return deref; |
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| 114 | } else { |
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| 115 | return appExpr; |
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| 116 | } // if |
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| 117 | } |
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| 118 | |
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| 119 | Statement * Pass1::mutate(ReturnStmt *retStmt) { |
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| 120 | if ( retval && retStmt->get_expr() ) { |
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| 121 | assert( ! retStmt->get_expr()->get_results().empty() ); |
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| 122 | while ( CastExpr *castExpr = dynamic_cast< CastExpr* >( retStmt->get_expr() ) ) { |
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| 123 | retStmt->set_expr( castExpr->get_arg() ); |
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| 124 | retStmt->get_expr()->set_env( castExpr->get_env() ); |
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| 125 | castExpr->set_env( 0 ); |
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| 126 | castExpr->set_arg( 0 ); |
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| 127 | delete castExpr; |
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| 128 | } // while |
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| 129 | if ( retStmt->get_expr()->get_results().front()->get_isLvalue() ) { |
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| 130 | retStmt->set_expr( new AddressExpr( retStmt->get_expr()->acceptMutator( *this ) ) ); |
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| 131 | } else { |
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| 132 | throw SemanticError( "Attempt to return non-lvalue from an lvalue-qualified function" ); |
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| 133 | } // if |
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| 134 | } // if |
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| 135 | return retStmt; |
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| 136 | } |
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| 137 | |
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| 138 | void Pass2::visit( FunctionType *funType ) { |
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| 139 | std::string typeName; |
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| 140 | if ( isLvalueRet( funType ) ) { |
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| 141 | DeclarationWithType *retParm = funType->get_returnVals().front(); |
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| 142 | |
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| 143 | // make a new parameter that is a pointer to the type of the old return value |
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| 144 | retParm->set_type( new PointerType( Type::Qualifiers(), retParm->get_type() ) ); |
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| 145 | } // if |
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[51b7345] | 146 | |
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[01aeade] | 147 | Visitor::visit( funType ); |
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| 148 | } |
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| 149 | } // namespace |
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[51b7345] | 150 | } // namespace GenPoly |
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[01aeade] | 151 | |
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[51587aa] | 152 | // Local Variables: // |
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| 153 | // tab-width: 4 // |
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| 154 | // mode: c++ // |
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| 155 | // compile-command: "make install" // |
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| 156 | // End: // |
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