[51b7345] | 1 | /* |
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| 2 | * This file is part of the Cforall project |
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| 3 | * |
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| 4 | * $Id: Lvalue.cc,v 1.5 2005/08/29 20:14:13 rcbilson Exp $ |
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| 5 | * |
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| 6 | */ |
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| 7 | |
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| 8 | #include <cassert> |
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| 9 | |
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| 10 | #include "Lvalue.h" |
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| 11 | |
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| 12 | #include "SynTree/Declaration.h" |
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| 13 | #include "SynTree/Type.h" |
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| 14 | #include "SynTree/Expression.h" |
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| 15 | #include "SynTree/Statement.h" |
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| 16 | #include "SynTree/Visitor.h" |
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| 17 | #include "SynTree/Mutator.h" |
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| 18 | #include "SymTab/Indexer.h" |
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| 19 | #include "ResolvExpr/Resolver.h" |
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| 20 | #include "ResolvExpr/typeops.h" |
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| 21 | |
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| 22 | #include "UniqueName.h" |
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| 23 | #include "utility.h" |
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| 24 | |
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| 25 | |
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| 26 | namespace GenPoly { |
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| 27 | |
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| 28 | namespace { |
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| 29 | |
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| 30 | const std::list<Label> noLabels; |
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| 31 | |
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| 32 | class Pass1 : public Mutator |
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| 33 | { |
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| 34 | public: |
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| 35 | Pass1(); |
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| 36 | |
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| 37 | virtual Expression *mutate( ApplicationExpr *appExpr ); |
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| 38 | virtual Statement *mutate( ReturnStmt *appExpr ); |
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| 39 | virtual DeclarationWithType *mutate( FunctionDecl *funDecl ); |
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| 40 | |
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| 41 | private: |
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| 42 | DeclarationWithType* retval; |
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| 43 | }; |
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| 44 | |
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| 45 | class Pass2 : public Visitor |
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| 46 | { |
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| 47 | public: |
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| 48 | virtual void visit( FunctionType *funType ); |
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| 49 | |
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| 50 | private: |
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| 51 | }; |
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| 52 | |
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| 53 | } // namespace |
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| 54 | |
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| 55 | void |
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| 56 | convertLvalue( std::list< Declaration* >& translationUnit ) |
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| 57 | { |
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| 58 | Pass1 p1; |
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| 59 | Pass2 p2; |
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| 60 | mutateAll( translationUnit, p1 ); |
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| 61 | acceptAll( translationUnit, p2 ); |
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| 62 | } |
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| 63 | |
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| 64 | namespace { |
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| 65 | |
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| 66 | bool |
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| 67 | isLvalueRet( FunctionType *function ) |
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| 68 | { |
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| 69 | if( !function->get_returnVals().empty() ) { |
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| 70 | return function->get_returnVals().front()->get_type()->get_isLvalue(); |
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| 71 | } else { |
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| 72 | return false; |
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| 73 | } |
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| 74 | } |
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| 75 | |
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| 76 | bool |
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| 77 | isIntrinsicApp( ApplicationExpr *appExpr ) |
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| 78 | { |
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| 79 | if( VariableExpr *varExpr = dynamic_cast< VariableExpr* >( appExpr->get_function() ) ) { |
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| 80 | return varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic; |
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| 81 | } else { |
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| 82 | return false; |
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| 83 | } |
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| 84 | } |
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| 85 | |
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| 86 | Pass1::Pass1() |
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| 87 | { |
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| 88 | } |
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| 89 | |
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| 90 | DeclarationWithType* |
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| 91 | Pass1::mutate( FunctionDecl *funcDecl ) |
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| 92 | { |
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| 93 | if( funcDecl->get_statements() ) { |
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| 94 | DeclarationWithType* oldRetval = retval; |
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| 95 | retval = 0; |
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| 96 | if( !LinkageSpec::isBuiltin( funcDecl->get_linkage() ) && isLvalueRet( funcDecl->get_functionType() ) ) { |
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| 97 | retval = funcDecl->get_functionType()->get_returnVals().front(); |
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| 98 | } |
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| 99 | // fix expressions and return statements in this function |
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| 100 | funcDecl->set_statements( funcDecl->get_statements()->acceptMutator( *this ) ); |
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| 101 | retval = oldRetval; |
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| 102 | } |
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| 103 | return funcDecl; |
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| 104 | } |
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| 105 | |
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| 106 | Expression* |
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| 107 | Pass1::mutate( ApplicationExpr *appExpr ) |
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| 108 | { |
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| 109 | appExpr->get_function()->acceptMutator( *this ); |
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| 110 | mutateAll( appExpr->get_args(), *this ); |
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| 111 | |
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| 112 | assert( !appExpr->get_function()->get_results().empty() ); |
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| 113 | |
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| 114 | PointerType *pointer = dynamic_cast< PointerType* >( appExpr->get_function()->get_results().front() ); |
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| 115 | assert( pointer ); |
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| 116 | FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ); |
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| 117 | assert( function ); |
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| 118 | |
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| 119 | std::string typeName; |
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| 120 | if( isLvalueRet( function ) && !isIntrinsicApp( appExpr ) ) { |
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| 121 | UntypedExpr *deref = new UntypedExpr( new NameExpr( "*?" ) ); |
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| 122 | deref->get_results().push_back( appExpr->get_results().front() ); |
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| 123 | appExpr->get_results().front() = new PointerType( Type::Qualifiers(), deref->get_results().front()->clone() ); |
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| 124 | deref->get_args().push_back( appExpr ); |
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| 125 | return deref; |
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| 126 | } else { |
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| 127 | return appExpr; |
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| 128 | } |
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| 129 | } |
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| 130 | |
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| 131 | Statement* |
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| 132 | Pass1::mutate(ReturnStmt *retStmt) |
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| 133 | { |
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| 134 | if( retval && retStmt->get_expr() ) { |
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| 135 | assert( !retStmt->get_expr()->get_results().empty() ); |
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| 136 | while( CastExpr *castExpr = dynamic_cast< CastExpr* >( retStmt->get_expr() ) ) { |
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| 137 | retStmt->set_expr( castExpr->get_arg() ); |
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| 138 | retStmt->get_expr()->set_env( castExpr->get_env() ); |
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| 139 | castExpr->set_env( 0 ); |
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| 140 | castExpr->set_arg( 0 ); |
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| 141 | delete castExpr; |
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| 142 | } |
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| 143 | if( retStmt->get_expr()->get_results().front()->get_isLvalue() ) { |
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| 144 | retStmt->set_expr( new AddressExpr( retStmt->get_expr()->acceptMutator( *this ) ) ); |
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| 145 | } else { |
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| 146 | throw SemanticError( "Attempt to return non-lvalue from an lvalue-qualified function" ); |
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| 147 | } |
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| 148 | } |
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| 149 | return retStmt; |
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| 150 | } |
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| 151 | |
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| 152 | void |
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| 153 | Pass2::visit( FunctionType *funType ) |
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| 154 | { |
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| 155 | std::string typeName; |
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| 156 | if( isLvalueRet( funType ) ) { |
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| 157 | DeclarationWithType *retParm = funType->get_returnVals().front(); |
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| 158 | |
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| 159 | // make a new parameter that is a pointer to the type of the old return value |
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| 160 | retParm->set_type( new PointerType( Type::Qualifiers(), retParm->get_type() ) ); |
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| 161 | } |
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| 162 | |
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| 163 | Visitor::visit( funType ); |
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| 164 | } |
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| 165 | |
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| 166 | } // namespace |
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| 167 | |
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| 168 | } // namespace GenPoly |
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