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 | // XXX.cc -- |
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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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11 | // Last Modified By : |
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12 | // Last Modified On : |
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13 | // Update Count : 0 |
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14 | // |
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15 | /* |
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16 | * This file is part of the Cforall project |
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17 | * |
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18 | * $Id: Specialize.cc,v 1.4 2005/08/29 20:14:13 rcbilson Exp $ |
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19 | * |
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20 | */ |
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21 | |
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22 | #include <cassert> |
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23 | |
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24 | #include "Specialize.h" |
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25 | #include "PolyMutator.h" |
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26 | |
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27 | #include "SynTree/Declaration.h" |
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28 | #include "SynTree/Statement.h" |
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29 | #include "SynTree/Expression.h" |
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30 | #include "SynTree/Type.h" |
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31 | #include "SynTree/TypeSubstitution.h" |
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32 | #include "SynTree/Mutator.h" |
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33 | #include "ResolvExpr/FindOpenVars.h" |
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34 | #include "UniqueName.h" |
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35 | #include "utility.h" |
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36 | |
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37 | |
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38 | namespace GenPoly { |
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39 | |
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40 | const std::list<Label> noLabels; |
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41 | |
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42 | class Specialize : public PolyMutator |
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43 | { |
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44 | public: |
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45 | Specialize( std::string paramPrefix = "_p" ); |
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46 | |
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47 | virtual Expression* mutate(ApplicationExpr *applicationExpr); |
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48 | virtual Expression* mutate(AddressExpr *castExpr); |
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49 | virtual Expression* mutate(CastExpr *castExpr); |
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50 | virtual Expression* mutate(LogicalExpr *logicalExpr); |
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51 | virtual Expression* mutate(ConditionalExpr *conditionalExpr); |
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52 | virtual Expression* mutate(CommaExpr *commaExpr); |
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53 | |
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54 | private: |
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55 | Expression *doSpecialization( Type *formalType, Expression *actual, InferredParams *inferParams = 0 ); |
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56 | void handleExplicitParams( ApplicationExpr *appExpr ); |
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57 | |
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58 | UniqueName thunkNamer; |
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59 | std::string paramPrefix; |
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60 | }; |
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61 | |
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62 | void |
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63 | convertSpecializations( std::list< Declaration* >& translationUnit ) |
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64 | { |
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65 | Specialize specializer; |
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66 | mutateAll( translationUnit, specializer ); |
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67 | } |
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68 | |
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69 | Specialize::Specialize( std::string paramPrefix ) |
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70 | : thunkNamer( "_thunk" ), paramPrefix( paramPrefix ) |
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71 | { |
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72 | } |
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73 | |
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74 | bool |
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75 | needsSpecialization( Type *formalType, Type *actualType, TypeSubstitution *env ) |
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76 | { |
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77 | if ( env ) { |
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78 | using namespace ResolvExpr; |
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79 | OpenVarSet openVars, closedVars; |
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80 | AssertionSet need, have; |
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81 | findOpenVars( formalType, openVars, closedVars, need, have, false ); |
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82 | findOpenVars( actualType, openVars, closedVars, need, have, true ); |
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83 | for ( OpenVarSet::const_iterator openVar = openVars.begin(); openVar != openVars.end(); ++openVar ) { |
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84 | Type *boundType = env->lookup( openVar->first ); |
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85 | if ( ! boundType ) continue; |
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86 | if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( boundType ) ) { |
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87 | if ( closedVars.find( typeInst->get_name() ) == closedVars.end() ) { |
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88 | return true; |
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89 | } |
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90 | } else { |
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91 | return true; |
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92 | } |
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93 | } |
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94 | return false; |
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95 | } else { |
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96 | return false; |
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97 | } |
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98 | } |
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99 | |
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100 | Expression* |
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101 | Specialize::doSpecialization( Type *formalType, Expression *actual, InferredParams *inferParams ) |
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102 | { |
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103 | if ( needsSpecialization( formalType, actual->get_results().front(), env ) ) { |
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104 | PointerType *ptrType; |
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105 | FunctionType *funType; |
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106 | if ( ( ptrType = dynamic_cast< PointerType* >( formalType ) ) && ( funType = dynamic_cast< FunctionType* >( ptrType->get_base() ) ) ) { |
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107 | FunctionType *newType = funType->clone(); |
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108 | if ( env ) { |
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109 | TypeSubstitution newEnv( *env ); |
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110 | // it is important to replace only occurrences of type variables that occur free in the |
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111 | // thunk's type |
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112 | newEnv.applyFree( newType ); |
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113 | } |
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114 | FunctionDecl *thunkFunc = new FunctionDecl( thunkNamer.newName(), Declaration::NoStorageClass, LinkageSpec::C, newType, new CompoundStmt( std::list< std::string >() ), false ); |
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115 | thunkFunc->fixUniqueId(); |
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116 | |
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117 | UniqueName paramNamer( paramPrefix ); |
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118 | ApplicationExpr *appExpr = new ApplicationExpr( actual ); |
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119 | for ( std::list< DeclarationWithType* >::iterator param = thunkFunc->get_functionType()->get_parameters().begin(); param != thunkFunc->get_functionType()->get_parameters().end(); ++param ) { |
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120 | (*param)->set_name( paramNamer.newName() ); |
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121 | appExpr->get_args().push_back( new VariableExpr( *param ) ); |
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122 | } |
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123 | appExpr->set_env( maybeClone( env ) ); |
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124 | if ( inferParams ) { |
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125 | appExpr->get_inferParams() = *inferParams; |
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126 | } |
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127 | |
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128 | // handle any specializations that may still be present |
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129 | std::string oldParamPrefix = paramPrefix; |
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130 | paramPrefix += "p"; |
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131 | std::list< Statement* > oldStmts; |
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132 | oldStmts.splice( oldStmts.end(), stmtsToAdd ); |
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133 | handleExplicitParams( appExpr ); |
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134 | paramPrefix = oldParamPrefix; |
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135 | thunkFunc->get_statements()->get_kids().splice( thunkFunc->get_statements()->get_kids().end(), stmtsToAdd ); |
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136 | stmtsToAdd.splice( stmtsToAdd.end(), oldStmts ); |
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137 | |
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138 | Statement *appStmt; |
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139 | if ( funType->get_returnVals().empty() ) { |
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140 | appStmt = new ExprStmt( noLabels, appExpr ); |
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141 | } else { |
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142 | appStmt = new ReturnStmt( noLabels, appExpr ); |
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143 | } |
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144 | thunkFunc->get_statements()->get_kids().push_back( appStmt ); |
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145 | stmtsToAdd.push_back( new DeclStmt( noLabels, thunkFunc ) ); |
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146 | return new AddressExpr( new VariableExpr( thunkFunc ) ); |
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147 | } else { |
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148 | return actual; |
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149 | } |
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150 | } else { |
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151 | return actual; |
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152 | } |
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153 | } |
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154 | |
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155 | void |
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156 | Specialize::handleExplicitParams( ApplicationExpr *appExpr ) |
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157 | { |
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158 | // create thunks for the explicit parameters |
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159 | assert( ! appExpr->get_function()->get_results().empty() ); |
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160 | PointerType *pointer = dynamic_cast< PointerType* >( appExpr->get_function()->get_results().front() ); |
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161 | assert( pointer ); |
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162 | FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ); |
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163 | std::list< DeclarationWithType* >::iterator formal; |
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164 | std::list< Expression* >::iterator actual; |
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165 | 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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166 | *actual = doSpecialization( (*formal)->get_type(), *actual, &appExpr->get_inferParams() ); |
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167 | } |
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168 | } |
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169 | |
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170 | Expression* |
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171 | Specialize::mutate(ApplicationExpr *appExpr) |
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172 | { |
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173 | appExpr->get_function()->acceptMutator( *this ); |
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174 | mutateAll( appExpr->get_args(), *this ); |
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175 | |
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176 | // create thunks for the inferred parameters |
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177 | for ( InferredParams::iterator inferParam = appExpr->get_inferParams().begin(); inferParam != appExpr->get_inferParams().end(); ++inferParam ) { |
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178 | inferParam->second.expr = doSpecialization( inferParam->second.formalType, inferParam->second.expr, &appExpr->get_inferParams() ); |
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179 | } |
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180 | |
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181 | handleExplicitParams(appExpr); |
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182 | |
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183 | return appExpr; |
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184 | } |
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185 | |
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186 | Expression* |
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187 | Specialize::mutate(AddressExpr *addrExpr) |
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188 | { |
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189 | addrExpr->get_arg()->acceptMutator( *this ); |
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190 | addrExpr->set_arg( doSpecialization( addrExpr->get_results().front(), addrExpr->get_arg() ) ); |
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191 | return addrExpr; |
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192 | } |
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193 | |
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194 | Expression* |
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195 | Specialize::mutate(CastExpr *castExpr) |
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196 | { |
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197 | castExpr->get_arg()->acceptMutator( *this ); |
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198 | castExpr->set_arg( doSpecialization( castExpr->get_results().front(), castExpr->get_arg() ) ); |
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199 | return castExpr; |
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200 | } |
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201 | |
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202 | Expression* |
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203 | Specialize::mutate(LogicalExpr *logicalExpr) |
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204 | { |
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205 | return logicalExpr; |
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206 | } |
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207 | |
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208 | Expression* |
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209 | Specialize::mutate(ConditionalExpr *condExpr) |
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210 | { |
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211 | return condExpr; |
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212 | } |
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213 | |
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214 | Expression* |
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215 | Specialize::mutate(CommaExpr *commaExpr) |
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216 | { |
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217 | return commaExpr; |
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218 | } |
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219 | |
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220 | } // namespace GenPoly |
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221 | // Local Variables: // |
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222 | // tab-width: 4 // |
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223 | // mode: c++ // |
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224 | // compile-command: "make install" // |
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225 | // End: // |
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