| 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 | // |
|---|
| 7 | // CopyParams.cc -- |
|---|
| 8 | // |
|---|
| 9 | // Author : Richard C. Bilson |
|---|
| 10 | // Created On : Mon May 18 07:44:20 2015 |
|---|
| 11 | // Last Modified By : Rob Schluntz |
|---|
| 12 | // Last Modified On : Tue May 19 07:33:31 2015 |
|---|
| 13 | // Update Count : 1 |
|---|
| 14 | // |
|---|
| 15 | |
|---|
| 16 | #include <cassert> // for assert |
|---|
| 17 | #include <list> // for list, _List_iterator, _List_const_... |
|---|
| 18 | #include <map> // for map, _Rb_tree_const_iterator, map<... |
|---|
| 19 | #include <set> // for set, set<>::const_iterator |
|---|
| 20 | #include <string> // for string, operator== |
|---|
| 21 | #include <utility> // for pair |
|---|
| 22 | |
|---|
| 23 | #include "Common/SemanticError.h" // for SemanticError |
|---|
| 24 | #include "Common/UniqueName.h" // for UniqueName |
|---|
| 25 | #include "SynTree/Declaration.h" // for DeclarationWithType, TypeDecl, Fun... |
|---|
| 26 | #include "SynTree/Expression.h" // for VariableExpr, ApplicationExpr, Add... |
|---|
| 27 | #include "SynTree/Label.h" // for Label, noLabels |
|---|
| 28 | #include "SynTree/Statement.h" // for CompoundStmt, DeclStmt, ExprStmt |
|---|
| 29 | #include "SynTree/SynTree.h" // for UniqueId |
|---|
| 30 | #include "SynTree/Type.h" // for FunctionType, TypeInstType, Type |
|---|
| 31 | #include "SynTree/Visitor.h" // for acceptAll, Visitor |
|---|
| 32 | |
|---|
| 33 | namespace GenPoly { |
|---|
| 34 | class CopyParams : public Visitor { |
|---|
| 35 | public: |
|---|
| 36 | CopyParams(); |
|---|
| 37 | |
|---|
| 38 | virtual void visit( FunctionDecl *funcDecl ); |
|---|
| 39 | virtual void visit( AddressExpr *addrExpr ); |
|---|
| 40 | |
|---|
| 41 | private: |
|---|
| 42 | std::set< DeclarationWithType * > modVars; |
|---|
| 43 | UniqueName namer; |
|---|
| 44 | }; |
|---|
| 45 | |
|---|
| 46 | /// creates local copies of polymorphic function parameters |
|---|
| 47 | void copyParams( std::list< Declaration* > &translationUnit ) { |
|---|
| 48 | CopyParams copier; |
|---|
| 49 | acceptAll( translationUnit, copier ); |
|---|
| 50 | } |
|---|
| 51 | |
|---|
| 52 | CopyParams::CopyParams() : namer( "_cp" ) {} |
|---|
| 53 | |
|---|
| 54 | void CopyParams::visit( FunctionDecl *funcDecl ) { |
|---|
| 55 | if ( funcDecl->statements ) { |
|---|
| 56 | funcDecl->statements->accept( *this ); |
|---|
| 57 | |
|---|
| 58 | if ( ! modVars.empty() ) { |
|---|
| 59 | std::map< std::string, DeclarationWithType* > assignOps; |
|---|
| 60 | // xxx - this needs to use constructors, not assignment operators |
|---|
| 61 | // assume the assignment operator is the first assert param after any "type" parameter |
|---|
| 62 | for ( Type::ForallList::const_iterator tyVar = funcDecl->type->forall.begin(); tyVar != funcDecl->type->forall.end(); ++tyVar ) { |
|---|
| 63 | if ( (*tyVar)->get_kind() == TypeDecl::Any ) { |
|---|
| 64 | assert( !(*tyVar)->assertions.empty() ); |
|---|
| 65 | assert( (*tyVar)->assertions.front()->name == "?=?" ); |
|---|
| 66 | assignOps[ (*tyVar)->name ] = (*tyVar)->assertions.front(); |
|---|
| 67 | } // if |
|---|
| 68 | } // for |
|---|
| 69 | for ( std::list< DeclarationWithType* >::iterator param = funcDecl->type->parameters.begin(); param != funcDecl->type->parameters.end(); ++param ) { |
|---|
| 70 | std::set< DeclarationWithType * >::const_iterator var = modVars.find( *param ); |
|---|
| 71 | if ( var != modVars.end() ) { |
|---|
| 72 | TypeInstType *typeInst = dynamic_cast< TypeInstType* >( (*param)->get_type() ); |
|---|
| 73 | std::map< std::string, DeclarationWithType* >::const_iterator assignOp = assignOps.find( typeInst->name ); |
|---|
| 74 | if ( assignOp != assignOps.end() ) { |
|---|
| 75 | DeclarationWithType *oldParam = *param; |
|---|
| 76 | *param = (*param)->clone(); |
|---|
| 77 | (*param)->set_mangleName( namer.newName( (*param)->get_mangleName() ) ); |
|---|
| 78 | ApplicationExpr *assign = new ApplicationExpr( new VariableExpr( assignOp->second ) ); |
|---|
| 79 | assign->args.push_back( new VariableExpr( oldParam ) ); |
|---|
| 80 | assign->args.push_back( new VariableExpr( *param ) ); |
|---|
| 81 | funcDecl->statements->push_front( new ExprStmt( noLabels, assign ) ); |
|---|
| 82 | funcDecl->statements->push_front( new DeclStmt( noLabels, oldParam ) ); |
|---|
| 83 | } // if |
|---|
| 84 | modVars.erase( var ); |
|---|
| 85 | } // if |
|---|
| 86 | } // for |
|---|
| 87 | } // if |
|---|
| 88 | } // if |
|---|
| 89 | } |
|---|
| 90 | |
|---|
| 91 | // this test is insufficient because it is possible for values to be modified by being passed to other polymorphic |
|---|
| 92 | // routines (e.g., assignment operators) without having their addresses explicitly taken. Some thought is needed to |
|---|
| 93 | // make sure that all of the correct cases are identified where copies are necessary. |
|---|
| 94 | // |
|---|
| 95 | // As a temporary measure, for correctness at the expense of performance, ignore the modVars list entirely and copy |
|---|
| 96 | // every parameter of TypeInstType* when visiting the FunctionDecl. |
|---|
| 97 | void CopyParams::visit( AddressExpr *addrExpr ) { |
|---|
| 98 | if ( VariableExpr *varExpr = dynamic_cast< VariableExpr* >( addrExpr->arg ) ) { |
|---|
| 99 | if ( dynamic_cast< TypeInstType* >( varExpr->var->get_type() ) ) { |
|---|
| 100 | modVars.insert( varExpr->var ); |
|---|
| 101 | } // if |
|---|
| 102 | } // if |
|---|
| 103 | } |
|---|
| 104 | } // namespace GenPoly |
|---|
| 105 | |
|---|
| 106 | // Local Variables: // |
|---|
| 107 | // tab-width: 4 // |
|---|
| 108 | // mode: c++ // |
|---|
| 109 | // compile-command: "make install" // |
|---|
| 110 | // End: // |
|---|
