[51587aa] | 1 | //
|
---|
| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
|
---|
| 3 | //
|
---|
| 4 | // The contents of this file are covered under the licence agreement in the
|
---|
| 5 | // file "LICENCE" distributed with Cforall.
|
---|
| 6 | //
|
---|
[f1e012b] | 7 | // Specialize.cc --
|
---|
[51587aa] | 8 | //
|
---|
| 9 | // Author : Richard C. Bilson
|
---|
| 10 | // Created On : Mon May 18 07:44:20 2015
|
---|
[8cbf8cd] | 11 | // Last Modified By : Rob Schluntz
|
---|
[fea7ca7] | 12 | // Last Modified On : Thu Apr 28 15:17:45 2016
|
---|
[771b3c3] | 13 | // Update Count : 24
|
---|
[51587aa] | 14 | //
|
---|
[51b73452] | 15 |
|
---|
| 16 | #include <cassert>
|
---|
| 17 |
|
---|
| 18 | #include "Specialize.h"
|
---|
[7754cde] | 19 | #include "GenPoly.h"
|
---|
[51b73452] | 20 | #include "PolyMutator.h"
|
---|
| 21 |
|
---|
[68cd1ce] | 22 | #include "Parser/ParseNode.h"
|
---|
| 23 |
|
---|
[51b73452] | 24 | #include "SynTree/Expression.h"
|
---|
[68cd1ce] | 25 | #include "SynTree/Statement.h"
|
---|
[51b73452] | 26 | #include "SynTree/Type.h"
|
---|
[64a32c6] | 27 | #include "SynTree/Attribute.h"
|
---|
[51b73452] | 28 | #include "SynTree/TypeSubstitution.h"
|
---|
| 29 | #include "SynTree/Mutator.h"
|
---|
| 30 | #include "ResolvExpr/FindOpenVars.h"
|
---|
[d3b7937] | 31 | #include "Common/UniqueName.h"
|
---|
| 32 | #include "Common/utility.h"
|
---|
[51b73452] | 33 |
|
---|
| 34 | namespace GenPoly {
|
---|
[01aeade] | 35 | const std::list<Label> noLabels;
|
---|
| 36 |
|
---|
| 37 | class Specialize : public PolyMutator {
|
---|
| 38 | public:
|
---|
| 39 | Specialize( std::string paramPrefix = "_p" );
|
---|
| 40 |
|
---|
| 41 | virtual Expression * mutate( ApplicationExpr *applicationExpr );
|
---|
| 42 | virtual Expression * mutate( AddressExpr *castExpr );
|
---|
| 43 | virtual Expression * mutate( CastExpr *castExpr );
|
---|
[fea7ca7] | 44 | // virtual Expression * mutate( LogicalExpr *logicalExpr );
|
---|
| 45 | // virtual Expression * mutate( ConditionalExpr *conditionalExpr );
|
---|
| 46 | // virtual Expression * mutate( CommaExpr *commaExpr );
|
---|
[01aeade] | 47 |
|
---|
| 48 | private:
|
---|
[698664b3] | 49 | Expression *createThunkFunction( FunctionType *funType, Expression *actual, InferredParams *inferParams = 0 );
|
---|
[01aeade] | 50 | Expression *doSpecialization( Type *formalType, Expression *actual, InferredParams *inferParams = 0 );
|
---|
| 51 | void handleExplicitParams( ApplicationExpr *appExpr );
|
---|
| 52 |
|
---|
| 53 | UniqueName thunkNamer;
|
---|
| 54 | std::string paramPrefix;
|
---|
| 55 | };
|
---|
| 56 |
|
---|
| 57 | void convertSpecializations( std::list< Declaration* >& translationUnit ) {
|
---|
| 58 | Specialize specializer;
|
---|
| 59 | mutateAll( translationUnit, specializer );
|
---|
| 60 | }
|
---|
| 61 |
|
---|
| 62 | Specialize::Specialize( std::string paramPrefix )
|
---|
| 63 | : thunkNamer( "_thunk" ), paramPrefix( paramPrefix ) {
|
---|
| 64 | }
|
---|
| 65 |
|
---|
[698664b3] | 66 | /// Looks up open variables in actual type, returning true if any of them are bound in the environment or formal type.
|
---|
[01aeade] | 67 | bool needsSpecialization( Type *formalType, Type *actualType, TypeSubstitution *env ) {
|
---|
| 68 | if ( env ) {
|
---|
| 69 | using namespace ResolvExpr;
|
---|
| 70 | OpenVarSet openVars, closedVars;
|
---|
| 71 | AssertionSet need, have;
|
---|
| 72 | findOpenVars( formalType, openVars, closedVars, need, have, false );
|
---|
| 73 | findOpenVars( actualType, openVars, closedVars, need, have, true );
|
---|
| 74 | for ( OpenVarSet::const_iterator openVar = openVars.begin(); openVar != openVars.end(); ++openVar ) {
|
---|
| 75 | Type *boundType = env->lookup( openVar->first );
|
---|
| 76 | if ( ! boundType ) continue;
|
---|
| 77 | if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( boundType ) ) {
|
---|
| 78 | if ( closedVars.find( typeInst->get_name() ) == closedVars.end() ) {
|
---|
| 79 | return true;
|
---|
| 80 | } // if
|
---|
| 81 | } else {
|
---|
| 82 | return true;
|
---|
| 83 | } // if
|
---|
| 84 | } // for
|
---|
| 85 | return false;
|
---|
| 86 | } else {
|
---|
| 87 | return false;
|
---|
| 88 | } // if
|
---|
| 89 | }
|
---|
| 90 |
|
---|
[698664b3] | 91 | /// Generates a thunk that calls `actual` with type `funType` and returns its address
|
---|
| 92 | Expression * Specialize::createThunkFunction( FunctionType *funType, Expression *actual, InferredParams *inferParams ) {
|
---|
| 93 | FunctionType *newType = funType->clone();
|
---|
| 94 | if ( env ) {
|
---|
| 95 | TypeSubstitution newEnv( *env );
|
---|
| 96 | // it is important to replace only occurrences of type variables that occur free in the
|
---|
| 97 | // thunk's type
|
---|
| 98 | newEnv.applyFree( newType );
|
---|
| 99 | } // if
|
---|
| 100 | // create new thunk with same signature as formal type (C linkage, empty body)
|
---|
| 101 | FunctionDecl *thunkFunc = new FunctionDecl( thunkNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, newType, new CompoundStmt( std::list< std::string >() ), false, false );
|
---|
| 102 | thunkFunc->fixUniqueId();
|
---|
| 103 |
|
---|
[64a32c6] | 104 | // thunks may be generated and not used - silence warning with attribute
|
---|
| 105 | thunkFunc->get_attributes().push_back( new Attribute( "unused" ) );
|
---|
| 106 |
|
---|
[698664b3] | 107 | // thread thunk parameters into call to actual function, naming thunk parameters as we go
|
---|
| 108 | UniqueName paramNamer( paramPrefix );
|
---|
| 109 | ApplicationExpr *appExpr = new ApplicationExpr( actual );
|
---|
| 110 | for ( std::list< DeclarationWithType* >::iterator param = thunkFunc->get_functionType()->get_parameters().begin(); param != thunkFunc->get_functionType()->get_parameters().end(); ++param ) {
|
---|
| 111 | (*param )->set_name( paramNamer.newName() );
|
---|
| 112 | appExpr->get_args().push_back( new VariableExpr( *param ) );
|
---|
| 113 | } // for
|
---|
| 114 | appExpr->set_env( maybeClone( env ) );
|
---|
| 115 | if ( inferParams ) {
|
---|
| 116 | appExpr->get_inferParams() = *inferParams;
|
---|
| 117 | } // if
|
---|
| 118 |
|
---|
| 119 | // handle any specializations that may still be present
|
---|
| 120 | std::string oldParamPrefix = paramPrefix;
|
---|
| 121 | paramPrefix += "p";
|
---|
| 122 | // save stmtsToAdd in oldStmts
|
---|
| 123 | std::list< Statement* > oldStmts;
|
---|
| 124 | oldStmts.splice( oldStmts.end(), stmtsToAdd );
|
---|
| 125 | handleExplicitParams( appExpr );
|
---|
| 126 | paramPrefix = oldParamPrefix;
|
---|
| 127 | // write any statements added for recursive specializations into the thunk body
|
---|
| 128 | thunkFunc->get_statements()->get_kids().splice( thunkFunc->get_statements()->get_kids().end(), stmtsToAdd );
|
---|
| 129 | // restore oldStmts into stmtsToAdd
|
---|
| 130 | stmtsToAdd.splice( stmtsToAdd.end(), oldStmts );
|
---|
| 131 |
|
---|
| 132 | // add return (or valueless expression) to the thunk
|
---|
| 133 | Statement *appStmt;
|
---|
| 134 | if ( funType->get_returnVals().empty() ) {
|
---|
| 135 | appStmt = new ExprStmt( noLabels, appExpr );
|
---|
| 136 | } else {
|
---|
| 137 | appStmt = new ReturnStmt( noLabels, appExpr );
|
---|
| 138 | } // if
|
---|
| 139 | thunkFunc->get_statements()->get_kids().push_back( appStmt );
|
---|
| 140 |
|
---|
| 141 | // add thunk definition to queue of statements to add
|
---|
| 142 | stmtsToAdd.push_back( new DeclStmt( noLabels, thunkFunc ) );
|
---|
| 143 | // return address of thunk function as replacement expression
|
---|
| 144 | return new AddressExpr( new VariableExpr( thunkFunc ) );
|
---|
| 145 | }
|
---|
[f1e012b] | 146 |
|
---|
[01aeade] | 147 | Expression * Specialize::doSpecialization( Type *formalType, Expression *actual, InferredParams *inferParams ) {
|
---|
[771b3c3] | 148 | assert( ! actual->get_results().empty() ); // using front, should have this assert
|
---|
[01aeade] | 149 | if ( needsSpecialization( formalType, actual->get_results().front(), env ) ) {
|
---|
| 150 | FunctionType *funType;
|
---|
[698664b3] | 151 | if ( ( funType = getFunctionType( formalType ) ) ) {
|
---|
| 152 | ApplicationExpr *appExpr;
|
---|
| 153 | VariableExpr *varExpr;
|
---|
| 154 | if ( ( appExpr = dynamic_cast<ApplicationExpr*>( actual ) ) ) {
|
---|
| 155 | return createThunkFunction( funType, appExpr->get_function(), inferParams );
|
---|
| 156 | } else if ( ( varExpr = dynamic_cast<VariableExpr*>( actual ) ) ) {
|
---|
| 157 | return createThunkFunction( funType, varExpr, inferParams );
|
---|
[01aeade] | 158 | } else {
|
---|
[698664b3] | 159 | // This likely won't work, as anything that could build an ApplicationExpr probably hit one of the previous two branches
|
---|
| 160 | return createThunkFunction( funType, actual, inferParams );
|
---|
| 161 | }
|
---|
[01aeade] | 162 | } else {
|
---|
| 163 | return actual;
|
---|
| 164 | } // if
|
---|
| 165 | } else {
|
---|
| 166 | return actual;
|
---|
| 167 | } // if
|
---|
| 168 | }
|
---|
| 169 |
|
---|
| 170 | void Specialize::handleExplicitParams( ApplicationExpr *appExpr ) {
|
---|
| 171 | // create thunks for the explicit parameters
|
---|
| 172 | assert( ! appExpr->get_function()->get_results().empty() );
|
---|
[698664b3] | 173 | FunctionType *function = getFunctionType( appExpr->get_function()->get_results().front() );
|
---|
| 174 | assert( function );
|
---|
[01aeade] | 175 | std::list< DeclarationWithType* >::iterator formal;
|
---|
| 176 | std::list< Expression* >::iterator actual;
|
---|
| 177 | for ( formal = function->get_parameters().begin(), actual = appExpr->get_args().begin(); formal != function->get_parameters().end() && actual != appExpr->get_args().end(); ++formal, ++actual ) {
|
---|
| 178 | *actual = doSpecialization( (*formal )->get_type(), *actual, &appExpr->get_inferParams() );
|
---|
| 179 | }
|
---|
| 180 | }
|
---|
| 181 |
|
---|
| 182 | Expression * Specialize::mutate( ApplicationExpr *appExpr ) {
|
---|
| 183 | appExpr->get_function()->acceptMutator( *this );
|
---|
| 184 | mutateAll( appExpr->get_args(), *this );
|
---|
| 185 |
|
---|
| 186 | // create thunks for the inferred parameters
|
---|
| 187 | for ( InferredParams::iterator inferParam = appExpr->get_inferParams().begin(); inferParam != appExpr->get_inferParams().end(); ++inferParam ) {
|
---|
| 188 | inferParam->second.expr = doSpecialization( inferParam->second.formalType, inferParam->second.expr, &appExpr->get_inferParams() );
|
---|
| 189 | }
|
---|
| 190 |
|
---|
| 191 | handleExplicitParams( appExpr );
|
---|
| 192 |
|
---|
| 193 | return appExpr;
|
---|
| 194 | }
|
---|
| 195 |
|
---|
| 196 | Expression * Specialize::mutate( AddressExpr *addrExpr ) {
|
---|
| 197 | addrExpr->get_arg()->acceptMutator( *this );
|
---|
[8cbf8cd] | 198 | assert( ! addrExpr->get_results().empty() );
|
---|
[01aeade] | 199 | addrExpr->set_arg( doSpecialization( addrExpr->get_results().front(), addrExpr->get_arg() ) );
|
---|
| 200 | return addrExpr;
|
---|
| 201 | }
|
---|
| 202 |
|
---|
| 203 | Expression * Specialize::mutate( CastExpr *castExpr ) {
|
---|
| 204 | castExpr->get_arg()->acceptMutator( *this );
|
---|
[803deb1] | 205 | if ( castExpr->get_results().empty() ) {
|
---|
| 206 | // can't specialize if we don't have a return value
|
---|
| 207 | return castExpr;
|
---|
| 208 | }
|
---|
[698664b3] | 209 | Expression *specialized = doSpecialization( castExpr->get_results().front(), castExpr->get_arg() );
|
---|
| 210 | if ( specialized != castExpr->get_arg() ) {
|
---|
| 211 | // assume here that the specialization incorporates the cast
|
---|
| 212 | return specialized;
|
---|
| 213 | } else {
|
---|
| 214 | return castExpr;
|
---|
| 215 | }
|
---|
[01aeade] | 216 | }
|
---|
| 217 |
|
---|
[fea7ca7] | 218 | // Removing these for now. Richard put these in for some reason, but it's not clear why.
|
---|
| 219 | // In particular, copy constructors produce a comma expression, and with this code the parts
|
---|
| 220 | // of that comma expression are not specialized, which causes problems.
|
---|
[01aeade] | 221 |
|
---|
[fea7ca7] | 222 | // Expression * Specialize::mutate( LogicalExpr *logicalExpr ) {
|
---|
| 223 | // return logicalExpr;
|
---|
| 224 | // }
|
---|
[01aeade] | 225 |
|
---|
[fea7ca7] | 226 | // Expression * Specialize::mutate( ConditionalExpr *condExpr ) {
|
---|
| 227 | // return condExpr;
|
---|
| 228 | // }
|
---|
| 229 |
|
---|
| 230 | // Expression * Specialize::mutate( CommaExpr *commaExpr ) {
|
---|
| 231 | // return commaExpr;
|
---|
| 232 | // }
|
---|
[51b73452] | 233 | } // namespace GenPoly
|
---|
[01aeade] | 234 |
|
---|
[51587aa] | 235 | // Local Variables: //
|
---|
| 236 | // tab-width: 4 //
|
---|
| 237 | // mode: c++ //
|
---|
| 238 | // compile-command: "make install" //
|
---|
| 239 | // End: //
|
---|