[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: Specialize.cc,v 1.4 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 "Specialize.h" |
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| 11 | #include "PolyMutator.h" |
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| 12 | |
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| 13 | #include "SynTree/Declaration.h" |
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| 14 | #include "SynTree/Statement.h" |
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| 15 | #include "SynTree/Expression.h" |
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| 16 | #include "SynTree/Type.h" |
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| 17 | #include "SynTree/TypeSubstitution.h" |
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| 18 | #include "SynTree/Mutator.h" |
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| 19 | #include "ResolvExpr/FindOpenVars.h" |
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| 20 | #include "UniqueName.h" |
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| 21 | #include "utility.h" |
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| 22 | |
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| 23 | |
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| 24 | namespace GenPoly { |
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| 25 | |
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| 26 | const std::list<Label> noLabels; |
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| 27 | |
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| 28 | class Specialize : public PolyMutator |
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| 29 | { |
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| 30 | public: |
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| 31 | Specialize( std::string paramPrefix = "_p" ); |
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| 32 | |
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| 33 | virtual Expression* mutate(ApplicationExpr *applicationExpr); |
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| 34 | virtual Expression* mutate(AddressExpr *castExpr); |
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| 35 | virtual Expression* mutate(CastExpr *castExpr); |
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| 36 | virtual Expression* mutate(LogicalExpr *logicalExpr); |
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| 37 | virtual Expression* mutate(ConditionalExpr *conditionalExpr); |
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| 38 | virtual Expression* mutate(CommaExpr *commaExpr); |
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| 39 | |
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| 40 | private: |
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| 41 | Expression *doSpecialization( Type *formalType, Expression *actual, InferredParams *inferParams = 0 ); |
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| 42 | void handleExplicitParams( ApplicationExpr *appExpr ); |
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| 43 | |
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| 44 | UniqueName thunkNamer; |
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| 45 | std::string paramPrefix; |
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| 46 | }; |
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| 47 | |
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| 48 | void |
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| 49 | convertSpecializations( std::list< Declaration* >& translationUnit ) |
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| 50 | { |
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| 51 | Specialize specializer; |
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| 52 | mutateAll( translationUnit, specializer ); |
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| 53 | } |
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| 54 | |
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| 55 | Specialize::Specialize( std::string paramPrefix ) |
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| 56 | : thunkNamer( "_thunk" ), paramPrefix( paramPrefix ) |
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| 57 | { |
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| 58 | } |
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| 59 | |
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| 60 | bool |
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| 61 | needsSpecialization( Type *formalType, Type *actualType, TypeSubstitution *env ) |
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| 62 | { |
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| 63 | if( env ) { |
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| 64 | using namespace ResolvExpr; |
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| 65 | OpenVarSet openVars, closedVars; |
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| 66 | AssertionSet need, have; |
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| 67 | findOpenVars( formalType, openVars, closedVars, need, have, false ); |
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| 68 | findOpenVars( actualType, openVars, closedVars, need, have, true ); |
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| 69 | for( OpenVarSet::const_iterator openVar = openVars.begin(); openVar != openVars.end(); ++openVar ) { |
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| 70 | Type *boundType = env->lookup( openVar->first ); |
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| 71 | if( !boundType ) continue; |
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| 72 | if( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( boundType ) ) { |
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| 73 | if( closedVars.find( typeInst->get_name() ) == closedVars.end() ) { |
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| 74 | return true; |
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| 75 | } |
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| 76 | } else { |
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| 77 | return true; |
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| 78 | } |
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| 79 | } |
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| 80 | return false; |
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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 | Expression* |
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| 87 | Specialize::doSpecialization( Type *formalType, Expression *actual, InferredParams *inferParams ) |
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| 88 | { |
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| 89 | if( needsSpecialization( formalType, actual->get_results().front(), env ) ) { |
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| 90 | PointerType *ptrType; |
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| 91 | FunctionType *funType; |
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| 92 | if( ( ptrType = dynamic_cast< PointerType* >( formalType ) ) && ( funType = dynamic_cast< FunctionType* >( ptrType->get_base() ) ) ) { |
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| 93 | FunctionType *newType = funType->clone(); |
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| 94 | if( env ) { |
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| 95 | TypeSubstitution newEnv( *env ); |
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| 96 | // it is important to replace only occurrences of type variables that occur free in the |
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| 97 | // thunk's type |
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| 98 | newEnv.applyFree( newType ); |
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| 99 | } |
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| 100 | FunctionDecl *thunkFunc = new FunctionDecl( thunkNamer.newName(), Declaration::NoStorageClass, LinkageSpec::C, newType, new CompoundStmt( std::list< std::string >() ), false ); |
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| 101 | thunkFunc->fixUniqueId(); |
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| 102 | |
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| 103 | UniqueName paramNamer( paramPrefix ); |
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| 104 | ApplicationExpr *appExpr = new ApplicationExpr( actual ); |
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| 105 | for( std::list< DeclarationWithType* >::iterator param = thunkFunc->get_functionType()->get_parameters().begin(); param != thunkFunc->get_functionType()->get_parameters().end(); ++param ) { |
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| 106 | (*param)->set_name( paramNamer.newName() ); |
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| 107 | appExpr->get_args().push_back( new VariableExpr( *param ) ); |
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| 108 | } |
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| 109 | appExpr->set_env( maybeClone( env ) ); |
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| 110 | if( inferParams ) { |
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| 111 | appExpr->get_inferParams() = *inferParams; |
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| 112 | } |
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| 113 | |
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| 114 | // handle any specializations that may still be present |
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| 115 | std::string oldParamPrefix = paramPrefix; |
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| 116 | paramPrefix += "p"; |
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| 117 | std::list< Statement* > oldStmts; |
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| 118 | oldStmts.splice( oldStmts.end(), stmtsToAdd ); |
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| 119 | handleExplicitParams( appExpr ); |
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| 120 | paramPrefix = oldParamPrefix; |
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| 121 | thunkFunc->get_statements()->get_kids().splice( thunkFunc->get_statements()->get_kids().end(), stmtsToAdd ); |
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| 122 | stmtsToAdd.splice( stmtsToAdd.end(), oldStmts ); |
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| 123 | |
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| 124 | Statement *appStmt; |
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| 125 | if( funType->get_returnVals().empty() ) { |
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| 126 | appStmt = new ExprStmt( noLabels, appExpr ); |
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| 127 | } else { |
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| 128 | appStmt = new ReturnStmt( noLabels, appExpr ); |
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| 129 | } |
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| 130 | thunkFunc->get_statements()->get_kids().push_back( appStmt ); |
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| 131 | stmtsToAdd.push_back( new DeclStmt( noLabels, thunkFunc ) ); |
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| 132 | return new AddressExpr( new VariableExpr( thunkFunc ) ); |
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| 133 | } else { |
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| 134 | return actual; |
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| 135 | } |
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| 136 | } else { |
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| 137 | return actual; |
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| 138 | } |
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| 139 | } |
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| 140 | |
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| 141 | void |
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| 142 | Specialize::handleExplicitParams( ApplicationExpr *appExpr ) |
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| 143 | { |
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| 144 | // create thunks for the explicit parameters |
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| 145 | assert( !appExpr->get_function()->get_results().empty() ); |
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| 146 | PointerType *pointer = dynamic_cast< PointerType* >( appExpr->get_function()->get_results().front() ); |
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| 147 | assert( pointer ); |
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| 148 | FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ); |
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| 149 | std::list< DeclarationWithType* >::iterator formal; |
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| 150 | std::list< Expression* >::iterator actual; |
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| 151 | for( formal = function->get_parameters().begin(), actual = appExpr->get_args().begin(); formal != function->get_parameters().end() && actual != appExpr->get_args().end(); ++formal, ++actual ) { |
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| 152 | *actual = doSpecialization( (*formal)->get_type(), *actual, &appExpr->get_inferParams() ); |
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| 153 | } |
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| 154 | } |
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| 155 | |
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| 156 | Expression* |
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| 157 | Specialize::mutate(ApplicationExpr *appExpr) |
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| 158 | { |
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| 159 | appExpr->get_function()->acceptMutator( *this ); |
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| 160 | mutateAll( appExpr->get_args(), *this ); |
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| 161 | |
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| 162 | // create thunks for the inferred parameters |
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| 163 | for( InferredParams::iterator inferParam = appExpr->get_inferParams().begin(); inferParam != appExpr->get_inferParams().end(); ++inferParam ) { |
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| 164 | inferParam->second.expr = doSpecialization( inferParam->second.formalType, inferParam->second.expr, &appExpr->get_inferParams() ); |
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| 165 | } |
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| 166 | |
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| 167 | handleExplicitParams(appExpr); |
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| 168 | |
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| 169 | return appExpr; |
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| 170 | } |
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| 171 | |
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| 172 | Expression* |
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| 173 | Specialize::mutate(AddressExpr *addrExpr) |
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| 174 | { |
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| 175 | addrExpr->get_arg()->acceptMutator( *this ); |
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| 176 | addrExpr->set_arg( doSpecialization( addrExpr->get_results().front(), addrExpr->get_arg() ) ); |
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| 177 | return addrExpr; |
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| 178 | } |
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| 179 | |
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| 180 | Expression* |
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| 181 | Specialize::mutate(CastExpr *castExpr) |
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| 182 | { |
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| 183 | castExpr->get_arg()->acceptMutator( *this ); |
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| 184 | castExpr->set_arg( doSpecialization( castExpr->get_results().front(), castExpr->get_arg() ) ); |
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| 185 | return castExpr; |
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| 186 | } |
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| 187 | |
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| 188 | Expression* |
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| 189 | Specialize::mutate(LogicalExpr *logicalExpr) |
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| 190 | { |
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| 191 | return logicalExpr; |
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| 192 | } |
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| 193 | |
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| 194 | Expression* |
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| 195 | Specialize::mutate(ConditionalExpr *condExpr) |
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| 196 | { |
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| 197 | return condExpr; |
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| 198 | } |
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| 199 | |
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| 200 | Expression* |
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| 201 | Specialize::mutate(CommaExpr *commaExpr) |
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| 202 | { |
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| 203 | return commaExpr; |
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| 204 | } |
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| 205 | |
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| 206 | } // namespace GenPoly |
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