[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: Resolver.cc,v 1.19 2005/08/29 20:14:16 rcbilson Exp $ |
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| 5 | * |
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| 6 | */ |
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| 7 | |
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| 8 | #include "Resolver.h" |
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| 9 | #include "AlternativeFinder.h" |
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| 10 | #include "Alternative.h" |
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| 11 | #include "RenameVars.h" |
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| 12 | #include "ResolveTypeof.h" |
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| 13 | #include "SynTree/Statement.h" |
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| 14 | #include "SynTree/Type.h" |
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| 15 | #include "SynTree/Expression.h" |
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| 16 | #include "SynTree/Initializer.h" |
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| 17 | #include "SymTab/Indexer.h" |
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| 18 | #include "utility.h" |
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| 19 | |
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| 20 | namespace ResolvExpr { |
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| 21 | |
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| 22 | class Resolver : public SymTab::Indexer |
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| 23 | { |
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| 24 | public: |
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| 25 | Resolver() : SymTab::Indexer( false ), switchType( 0 ) {} |
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| 26 | |
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| 27 | virtual void visit( FunctionDecl *functionDecl ); |
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| 28 | virtual void visit( ObjectDecl *functionDecl ); |
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| 29 | virtual void visit( TypeDecl *typeDecl ); |
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| 30 | |
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| 31 | virtual void visit( ExprStmt *exprStmt ); |
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| 32 | virtual void visit( IfStmt *ifStmt ); |
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| 33 | virtual void visit( WhileStmt *whileStmt ); |
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| 34 | virtual void visit( ForStmt *forStmt ); |
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| 35 | virtual void visit( SwitchStmt *switchStmt ); |
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| 36 | virtual void visit( ChooseStmt *switchStmt ); |
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| 37 | virtual void visit( CaseStmt *caseStmt ); |
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| 38 | virtual void visit( ReturnStmt *returnStmt ); |
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| 39 | |
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| 40 | virtual void visit( SingleInit *singleInit ); |
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| 41 | |
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| 42 | private: |
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| 43 | std::list< Type* > functionReturn; |
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| 44 | Type* initContext; |
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| 45 | Type *switchType; |
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| 46 | }; |
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| 47 | |
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| 48 | void |
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| 49 | resolve( std::list< Declaration* > translationUnit ) |
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| 50 | { |
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| 51 | Resolver resolver; |
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| 52 | acceptAll( translationUnit, resolver ); |
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| 53 | /// for( std::list< Declaration* >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) { |
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| 54 | /// (*i)->print( std::cerr ); |
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| 55 | /// (*i)->accept( resolver ); |
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| 56 | /// } |
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| 57 | } |
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| 58 | |
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| 59 | Expression * |
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| 60 | resolveInVoidContext( Expression *expr, const SymTab::Indexer &indexer ) |
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| 61 | { |
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| 62 | TypeEnvironment env; |
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| 63 | return resolveInVoidContext( expr, indexer, env ); |
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| 64 | } |
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| 65 | |
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| 66 | namespace { |
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| 67 | |
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| 68 | void |
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| 69 | finishExpr( Expression *expr, const TypeEnvironment &env ) |
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| 70 | { |
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| 71 | expr->set_env( new TypeSubstitution ); |
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| 72 | env.makeSubstitution( *expr->get_env() ); |
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| 73 | } |
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| 74 | |
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| 75 | Expression* |
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| 76 | findVoidExpression( Expression *untyped, const SymTab::Indexer &indexer ) |
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| 77 | { |
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| 78 | global_renamer.reset(); |
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| 79 | TypeEnvironment env; |
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| 80 | Expression *newExpr = resolveInVoidContext( untyped, indexer, env ); |
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| 81 | finishExpr( newExpr, env ); |
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| 82 | return newExpr; |
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| 83 | } |
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| 84 | |
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| 85 | Expression* |
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| 86 | findSingleExpression( Expression *untyped, const SymTab::Indexer &indexer ) |
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| 87 | { |
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| 88 | TypeEnvironment env; |
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| 89 | AlternativeFinder finder( indexer, env ); |
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| 90 | finder.find( untyped ); |
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| 91 | /// if( finder.get_alternatives().size() != 1 ) { |
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| 92 | /// std::cout << "untyped expr is "; |
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| 93 | /// untyped->print( std::cout ); |
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| 94 | /// std::cout << std::endl << "alternatives are:"; |
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| 95 | /// for( std::list< Alternative >::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) { |
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| 96 | /// i->print( std::cout ); |
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| 97 | /// } |
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| 98 | /// } |
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| 99 | assert( finder.get_alternatives().size() == 1 ); |
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| 100 | Alternative &choice = finder.get_alternatives().front(); |
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| 101 | Expression *newExpr = choice.expr->clone(); |
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| 102 | finishExpr( newExpr, choice.env ); |
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| 103 | return newExpr; |
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| 104 | } |
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| 105 | |
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| 106 | bool |
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| 107 | isIntegralType( Type *type ) |
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| 108 | { |
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| 109 | if( dynamic_cast< EnumInstType* >( type ) ) { |
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| 110 | return true; |
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| 111 | } else if( BasicType *bt = dynamic_cast< BasicType* >( type ) ) { |
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| 112 | return bt->isInteger(); |
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| 113 | } else { |
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| 114 | return true; |
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| 115 | } |
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| 116 | } |
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| 117 | |
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| 118 | Expression* |
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| 119 | findIntegralExpression( Expression *untyped, const SymTab::Indexer &indexer ) |
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| 120 | { |
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| 121 | TypeEnvironment env; |
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| 122 | AlternativeFinder finder( indexer, env ); |
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| 123 | finder.find( untyped ); |
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| 124 | /// if( finder.get_alternatives().size() != 1 ) { |
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| 125 | /// std::cout << "untyped expr is "; |
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| 126 | /// untyped->print( std::cout ); |
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| 127 | /// std::cout << std::endl << "alternatives are:"; |
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| 128 | /// for( std::list< Alternative >::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) { |
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| 129 | /// i->print( std::cout ); |
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| 130 | /// } |
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| 131 | /// } |
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| 132 | Expression *newExpr = 0; |
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| 133 | const TypeEnvironment *newEnv = 0; |
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| 134 | for( AltList::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) { |
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| 135 | if( i->expr->get_results().size() == 1 && isIntegralType( i->expr->get_results().front() ) ) { |
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| 136 | if( newExpr ) { |
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| 137 | throw SemanticError( "Too many interpretations for switch control expression", untyped ); |
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| 138 | } else { |
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| 139 | newExpr = i->expr->clone(); |
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| 140 | newEnv = &i->env; |
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| 141 | } |
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| 142 | } |
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| 143 | } |
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| 144 | if( !newExpr ) { |
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| 145 | throw SemanticError( "Too many interpretations for switch control expression", untyped ); |
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| 146 | } |
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| 147 | finishExpr( newExpr, *newEnv ); |
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| 148 | return newExpr; |
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| 149 | } |
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| 150 | |
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| 151 | } |
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| 152 | |
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| 153 | void |
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| 154 | Resolver::visit( ObjectDecl *objectDecl ) |
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| 155 | { |
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| 156 | Type *new_type = resolveTypeof( objectDecl->get_type(), *this ); |
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| 157 | objectDecl->set_type( new_type ); |
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| 158 | initContext = new_type; |
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| 159 | SymTab::Indexer::visit( objectDecl ); |
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| 160 | } |
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| 161 | |
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| 162 | void |
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| 163 | Resolver::visit( TypeDecl *typeDecl ) |
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| 164 | { |
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| 165 | if( typeDecl->get_base() ) { |
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| 166 | Type *new_type = resolveTypeof( typeDecl->get_base(), *this ); |
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| 167 | typeDecl->set_base( new_type ); |
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| 168 | } |
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| 169 | SymTab::Indexer::visit( typeDecl ); |
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| 170 | } |
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| 171 | |
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| 172 | void |
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| 173 | Resolver::visit( FunctionDecl *functionDecl ) |
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| 174 | { |
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| 175 | /// std::cout << "resolver visiting functiondecl "; |
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| 176 | /// functionDecl->print( std::cout ); |
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| 177 | /// std::cout << std::endl; |
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| 178 | Type *new_type = resolveTypeof( functionDecl->get_type(), *this ); |
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| 179 | functionDecl->set_type( new_type ); |
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| 180 | std::list< Type* > oldFunctionReturn = functionReturn; |
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| 181 | functionReturn.clear(); |
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| 182 | for( std::list< DeclarationWithType* >::const_iterator i = functionDecl->get_functionType()->get_returnVals().begin(); i != functionDecl->get_functionType()->get_returnVals().end(); ++i ) { |
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| 183 | functionReturn.push_back( (*i)->get_type() ); |
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| 184 | } |
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| 185 | SymTab::Indexer::visit( functionDecl ); |
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| 186 | functionReturn = oldFunctionReturn; |
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| 187 | } |
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| 188 | |
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| 189 | void |
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| 190 | Resolver::visit( ExprStmt *exprStmt ) |
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| 191 | { |
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| 192 | if( exprStmt->get_expr() ) { |
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| 193 | Expression *newExpr = findVoidExpression( exprStmt->get_expr(), *this ); |
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| 194 | delete exprStmt->get_expr(); |
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| 195 | exprStmt->set_expr( newExpr ); |
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| 196 | } |
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| 197 | } |
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| 198 | |
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| 199 | void |
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| 200 | Resolver::visit( IfStmt *ifStmt ) |
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| 201 | { |
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| 202 | Expression *newExpr = findSingleExpression( ifStmt->get_condition(), *this ); |
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| 203 | delete ifStmt->get_condition(); |
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| 204 | ifStmt->set_condition( newExpr ); |
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| 205 | Visitor::visit( ifStmt ); |
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| 206 | } |
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| 207 | |
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| 208 | void |
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| 209 | Resolver::visit( WhileStmt *whileStmt ) |
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| 210 | { |
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| 211 | Expression *newExpr = findSingleExpression( whileStmt->get_condition(), *this ); |
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| 212 | delete whileStmt->get_condition(); |
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| 213 | whileStmt->set_condition( newExpr ); |
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| 214 | Visitor::visit( whileStmt ); |
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| 215 | } |
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| 216 | |
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| 217 | void |
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| 218 | Resolver::visit( ForStmt *forStmt ) |
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| 219 | { |
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| 220 | Expression *newExpr; |
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| 221 | if( forStmt->get_condition() ) { |
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| 222 | newExpr = findSingleExpression( forStmt->get_condition(), *this ); |
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| 223 | delete forStmt->get_condition(); |
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| 224 | forStmt->set_condition( newExpr ); |
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| 225 | } |
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| 226 | |
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| 227 | if( forStmt->get_increment() ) { |
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| 228 | newExpr = findVoidExpression( forStmt->get_increment(), *this ); |
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| 229 | delete forStmt->get_increment(); |
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| 230 | forStmt->set_increment( newExpr ); |
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| 231 | } |
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| 232 | |
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| 233 | Visitor::visit( forStmt ); |
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| 234 | } |
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| 235 | |
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| 236 | template< typename SwitchClass > |
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| 237 | void |
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| 238 | handleSwitchStmt( SwitchClass *switchStmt, SymTab::Indexer &visitor ) |
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| 239 | { |
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| 240 | Expression *newExpr; |
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| 241 | newExpr = findIntegralExpression( switchStmt->get_condition(), visitor ); |
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| 242 | delete switchStmt->get_condition(); |
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| 243 | switchStmt->set_condition( newExpr ); |
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| 244 | |
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| 245 | visitor.Visitor::visit( switchStmt ); |
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| 246 | } |
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| 247 | |
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| 248 | void |
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| 249 | Resolver::visit( SwitchStmt *switchStmt ) |
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| 250 | { |
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| 251 | handleSwitchStmt( switchStmt, *this ); |
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| 252 | } |
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| 253 | |
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| 254 | void |
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| 255 | Resolver::visit( ChooseStmt *switchStmt ) |
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| 256 | { |
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| 257 | handleSwitchStmt( switchStmt, *this ); |
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| 258 | } |
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| 259 | |
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| 260 | void |
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| 261 | Resolver::visit( CaseStmt *caseStmt ) |
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| 262 | { |
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| 263 | Visitor::visit( caseStmt ); |
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| 264 | } |
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| 265 | |
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| 266 | void |
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| 267 | Resolver::visit( ReturnStmt *returnStmt ) |
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| 268 | { |
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| 269 | if( returnStmt->get_expr() ) { |
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| 270 | CastExpr *castExpr = new CastExpr( returnStmt->get_expr() ); |
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| 271 | cloneAll( functionReturn, castExpr->get_results() ); |
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| 272 | Expression *newExpr = findSingleExpression( castExpr, *this ); |
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| 273 | delete castExpr; |
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| 274 | returnStmt->set_expr( newExpr ); |
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| 275 | } |
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| 276 | } |
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| 277 | |
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| 278 | void |
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| 279 | Resolver::visit( SingleInit *singleInit ) |
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| 280 | { |
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| 281 | if( singleInit->get_value() ) { |
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| 282 | CastExpr *castExpr = new CastExpr( singleInit->get_value(), initContext->clone() ); |
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| 283 | Expression *newExpr = findSingleExpression( castExpr, *this ); |
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| 284 | delete castExpr; |
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| 285 | singleInit->set_value( newExpr ); |
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| 286 | } |
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| 287 | singleInit->get_value()->accept( *this ); |
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| 288 | } |
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| 289 | |
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| 290 | } // namespace ResolvExpr |
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