[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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[f1e012b] | 7 | // Specialize.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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[8cbf8cd] | 11 | // Last Modified By : Rob Schluntz
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[fea7ca7] | 12 | // Last Modified On : Thu Apr 28 15:17:45 2016
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[771b3c3] | 13 | // Update Count : 24
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[51587aa] | 14 | //
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[51b73452] | 15 |
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| 16 | #include <cassert>
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| 17 |
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| 18 | #include "Specialize.h"
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[7754cde] | 19 | #include "GenPoly.h"
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[51b73452] | 20 | #include "PolyMutator.h"
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| 21 |
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[68cd1ce] | 22 | #include "Parser/ParseNode.h"
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| 23 |
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[51b73452] | 24 | #include "SynTree/Expression.h"
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[68cd1ce] | 25 | #include "SynTree/Statement.h"
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[51b73452] | 26 | #include "SynTree/Type.h"
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[64a32c6] | 27 | #include "SynTree/Attribute.h"
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[51b73452] | 28 | #include "SynTree/TypeSubstitution.h"
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| 29 | #include "SynTree/Mutator.h"
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| 30 | #include "ResolvExpr/FindOpenVars.h"
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[d3b7937] | 31 | #include "Common/UniqueName.h"
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| 32 | #include "Common/utility.h"
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[aedfd91] | 33 | #include "InitTweak/InitTweak.h"
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[51b73452] | 34 |
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| 35 | namespace GenPoly {
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[01aeade] | 36 | const std::list<Label> noLabels;
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| 37 |
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| 38 | class Specialize : public PolyMutator {
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| 39 | public:
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| 40 | Specialize( std::string paramPrefix = "_p" );
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| 41 |
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| 42 | virtual Expression * mutate( ApplicationExpr *applicationExpr );
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| 43 | virtual Expression * mutate( AddressExpr *castExpr );
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| 44 | virtual Expression * mutate( CastExpr *castExpr );
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[fea7ca7] | 45 | // virtual Expression * mutate( LogicalExpr *logicalExpr );
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| 46 | // virtual Expression * mutate( ConditionalExpr *conditionalExpr );
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| 47 | // virtual Expression * mutate( CommaExpr *commaExpr );
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[01aeade] | 48 |
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| 49 | private:
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[698664b3] | 50 | Expression *createThunkFunction( FunctionType *funType, Expression *actual, InferredParams *inferParams = 0 );
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[01aeade] | 51 | Expression *doSpecialization( Type *formalType, Expression *actual, InferredParams *inferParams = 0 );
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| 52 | void handleExplicitParams( ApplicationExpr *appExpr );
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| 53 |
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| 54 | UniqueName thunkNamer;
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| 55 | std::string paramPrefix;
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| 56 | };
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| 57 |
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| 58 | void convertSpecializations( std::list< Declaration* >& translationUnit ) {
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| 59 | Specialize specializer;
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| 60 | mutateAll( translationUnit, specializer );
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| 61 | }
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| 62 |
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| 63 | Specialize::Specialize( std::string paramPrefix )
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| 64 | : thunkNamer( "_thunk" ), paramPrefix( paramPrefix ) {
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| 65 | }
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| 66 |
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[698664b3] | 67 | /// Looks up open variables in actual type, returning true if any of them are bound in the environment or formal type.
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[01aeade] | 68 | bool needsSpecialization( Type *formalType, Type *actualType, TypeSubstitution *env ) {
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| 69 | if ( env ) {
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| 70 | using namespace ResolvExpr;
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| 71 | OpenVarSet openVars, closedVars;
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| 72 | AssertionSet need, have;
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| 73 | findOpenVars( formalType, openVars, closedVars, need, have, false );
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| 74 | findOpenVars( actualType, openVars, closedVars, need, have, true );
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| 75 | for ( OpenVarSet::const_iterator openVar = openVars.begin(); openVar != openVars.end(); ++openVar ) {
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| 76 | Type *boundType = env->lookup( openVar->first );
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| 77 | if ( ! boundType ) continue;
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| 78 | if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( boundType ) ) {
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| 79 | if ( closedVars.find( typeInst->get_name() ) == closedVars.end() ) {
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| 80 | return true;
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| 81 | } // if
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| 82 | } else {
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| 83 | return true;
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| 84 | } // if
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| 85 | } // for
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| 86 | return false;
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| 87 | } else {
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| 88 | return false;
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| 89 | } // if
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| 90 | }
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| 91 |
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[698664b3] | 92 | /// Generates a thunk that calls `actual` with type `funType` and returns its address
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| 93 | Expression * Specialize::createThunkFunction( FunctionType *funType, Expression *actual, InferredParams *inferParams ) {
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| 94 | FunctionType *newType = funType->clone();
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| 95 | if ( env ) {
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| 96 | TypeSubstitution newEnv( *env );
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| 97 | // it is important to replace only occurrences of type variables that occur free in the
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| 98 | // thunk's type
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| 99 | newEnv.applyFree( newType );
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| 100 | } // if
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| 101 | // create new thunk with same signature as formal type (C linkage, empty body)
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[0f8e4ac] | 102 | FunctionDecl *thunkFunc = new FunctionDecl( thunkNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, newType, new CompoundStmt( noLabels ), false, false );
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[698664b3] | 103 | thunkFunc->fixUniqueId();
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| 104 |
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[64a32c6] | 105 | // thunks may be generated and not used - silence warning with attribute
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| 106 | thunkFunc->get_attributes().push_back( new Attribute( "unused" ) );
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| 107 |
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[698664b3] | 108 | // thread thunk parameters into call to actual function, naming thunk parameters as we go
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| 109 | UniqueName paramNamer( paramPrefix );
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| 110 | ApplicationExpr *appExpr = new ApplicationExpr( actual );
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| 111 | for ( std::list< DeclarationWithType* >::iterator param = thunkFunc->get_functionType()->get_parameters().begin(); param != thunkFunc->get_functionType()->get_parameters().end(); ++param ) {
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| 112 | (*param )->set_name( paramNamer.newName() );
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| 113 | appExpr->get_args().push_back( new VariableExpr( *param ) );
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| 114 | } // for
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| 115 | appExpr->set_env( maybeClone( env ) );
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| 116 | if ( inferParams ) {
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| 117 | appExpr->get_inferParams() = *inferParams;
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| 118 | } // if
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| 119 |
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| 120 | // handle any specializations that may still be present
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| 121 | std::string oldParamPrefix = paramPrefix;
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| 122 | paramPrefix += "p";
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| 123 | // save stmtsToAdd in oldStmts
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| 124 | std::list< Statement* > oldStmts;
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| 125 | oldStmts.splice( oldStmts.end(), stmtsToAdd );
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| 126 | handleExplicitParams( appExpr );
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| 127 | paramPrefix = oldParamPrefix;
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| 128 | // write any statements added for recursive specializations into the thunk body
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| 129 | thunkFunc->get_statements()->get_kids().splice( thunkFunc->get_statements()->get_kids().end(), stmtsToAdd );
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| 130 | // restore oldStmts into stmtsToAdd
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| 131 | stmtsToAdd.splice( stmtsToAdd.end(), oldStmts );
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| 132 |
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| 133 | // add return (or valueless expression) to the thunk
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| 134 | Statement *appStmt;
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| 135 | if ( funType->get_returnVals().empty() ) {
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| 136 | appStmt = new ExprStmt( noLabels, appExpr );
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| 137 | } else {
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| 138 | appStmt = new ReturnStmt( noLabels, appExpr );
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| 139 | } // if
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| 140 | thunkFunc->get_statements()->get_kids().push_back( appStmt );
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| 141 |
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| 142 | // add thunk definition to queue of statements to add
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| 143 | stmtsToAdd.push_back( new DeclStmt( noLabels, thunkFunc ) );
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| 144 | // return address of thunk function as replacement expression
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| 145 | return new AddressExpr( new VariableExpr( thunkFunc ) );
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| 146 | }
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[f1e012b] | 147 |
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[01aeade] | 148 | Expression * Specialize::doSpecialization( Type *formalType, Expression *actual, InferredParams *inferParams ) {
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[771b3c3] | 149 | assert( ! actual->get_results().empty() ); // using front, should have this assert
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[01aeade] | 150 | if ( needsSpecialization( formalType, actual->get_results().front(), env ) ) {
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| 151 | FunctionType *funType;
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[698664b3] | 152 | if ( ( funType = getFunctionType( formalType ) ) ) {
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| 153 | ApplicationExpr *appExpr;
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| 154 | VariableExpr *varExpr;
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| 155 | if ( ( appExpr = dynamic_cast<ApplicationExpr*>( actual ) ) ) {
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| 156 | return createThunkFunction( funType, appExpr->get_function(), inferParams );
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| 157 | } else if ( ( varExpr = dynamic_cast<VariableExpr*>( actual ) ) ) {
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| 158 | return createThunkFunction( funType, varExpr, inferParams );
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[01aeade] | 159 | } else {
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[698664b3] | 160 | // This likely won't work, as anything that could build an ApplicationExpr probably hit one of the previous two branches
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| 161 | return createThunkFunction( funType, actual, inferParams );
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| 162 | }
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[01aeade] | 163 | } else {
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| 164 | return actual;
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| 165 | } // if
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| 166 | } else {
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| 167 | return actual;
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| 168 | } // if
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| 169 | }
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| 170 |
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| 171 | void Specialize::handleExplicitParams( ApplicationExpr *appExpr ) {
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| 172 | // create thunks for the explicit parameters
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| 173 | assert( ! appExpr->get_function()->get_results().empty() );
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[698664b3] | 174 | FunctionType *function = getFunctionType( appExpr->get_function()->get_results().front() );
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| 175 | assert( function );
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[01aeade] | 176 | std::list< DeclarationWithType* >::iterator formal;
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| 177 | std::list< Expression* >::iterator actual;
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| 178 | 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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| 179 | *actual = doSpecialization( (*formal )->get_type(), *actual, &appExpr->get_inferParams() );
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| 180 | }
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| 181 | }
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| 182 |
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| 183 | Expression * Specialize::mutate( ApplicationExpr *appExpr ) {
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| 184 | appExpr->get_function()->acceptMutator( *this );
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| 185 | mutateAll( appExpr->get_args(), *this );
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| 186 |
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[aedfd91] | 187 | if ( ! InitTweak::isIntrinsicCallExpr( appExpr ) ) {
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| 188 | // create thunks for the inferred parameters
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| 189 | // don't need to do this for intrinsic calls, because they aren't actually passed
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| 190 | for ( InferredParams::iterator inferParam = appExpr->get_inferParams().begin(); inferParam != appExpr->get_inferParams().end(); ++inferParam ) {
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| 191 | inferParam->second.expr = doSpecialization( inferParam->second.formalType, inferParam->second.expr, &appExpr->get_inferParams() );
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| 192 | }
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[01aeade] | 193 |
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[aedfd91] | 194 | handleExplicitParams( appExpr );
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| 195 | }
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[01aeade] | 196 |
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| 197 | return appExpr;
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| 198 | }
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| 199 |
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| 200 | Expression * Specialize::mutate( AddressExpr *addrExpr ) {
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| 201 | addrExpr->get_arg()->acceptMutator( *this );
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[8cbf8cd] | 202 | assert( ! addrExpr->get_results().empty() );
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[01aeade] | 203 | addrExpr->set_arg( doSpecialization( addrExpr->get_results().front(), addrExpr->get_arg() ) );
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| 204 | return addrExpr;
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| 205 | }
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| 206 |
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| 207 | Expression * Specialize::mutate( CastExpr *castExpr ) {
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| 208 | castExpr->get_arg()->acceptMutator( *this );
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[803deb1] | 209 | if ( castExpr->get_results().empty() ) {
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| 210 | // can't specialize if we don't have a return value
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| 211 | return castExpr;
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| 212 | }
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[698664b3] | 213 | Expression *specialized = doSpecialization( castExpr->get_results().front(), castExpr->get_arg() );
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| 214 | if ( specialized != castExpr->get_arg() ) {
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| 215 | // assume here that the specialization incorporates the cast
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| 216 | return specialized;
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| 217 | } else {
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| 218 | return castExpr;
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| 219 | }
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[01aeade] | 220 | }
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| 221 |
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[fea7ca7] | 222 | // Removing these for now. Richard put these in for some reason, but it's not clear why.
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| 223 | // In particular, copy constructors produce a comma expression, and with this code the parts
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| 224 | // of that comma expression are not specialized, which causes problems.
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[01aeade] | 225 |
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[fea7ca7] | 226 | // Expression * Specialize::mutate( LogicalExpr *logicalExpr ) {
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| 227 | // return logicalExpr;
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| 228 | // }
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[01aeade] | 229 |
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[fea7ca7] | 230 | // Expression * Specialize::mutate( ConditionalExpr *condExpr ) {
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| 231 | // return condExpr;
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| 232 | // }
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| 233 |
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| 234 | // Expression * Specialize::mutate( CommaExpr *commaExpr ) {
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| 235 | // return commaExpr;
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| 236 | // }
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[51b73452] | 237 | } // namespace GenPoly
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[01aeade] | 238 |
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[51587aa] | 239 | // Local Variables: //
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| 240 | // tab-width: 4 //
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| 241 | // mode: c++ //
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| 242 | // compile-command: "make install" //
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| 243 | // End: //
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