[6eb8948] | 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 | // TupleAssignment.cc -- |
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| 8 | // |
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| 9 | // Author : Rodolfo G. Esteves |
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| 10 | // Created On : Mon May 18 07:44:20 2015 |
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| 11 | // Last Modified By : Peter A. Buhr |
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| 12 | // Last Modified On : Mon May 18 15:02:53 2015 |
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| 13 | // Update Count : 2 |
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| 14 | // |
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| 15 | |
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| 16 | #include <iterator> |
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| 17 | #include <iostream> |
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| 18 | #include <cassert> |
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| 19 | #include "Tuples.h" |
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[f006f01] | 20 | #include "GenPoly/DeclMutator.h" |
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| 21 | #include "SynTree/Mutator.h" |
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[6eb8948] | 22 | #include "SynTree/Statement.h" |
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[f006f01] | 23 | #include "SynTree/Declaration.h" |
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| 24 | #include "SynTree/Type.h" |
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[3c13c03] | 25 | #include "SynTree/Expression.h" |
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| 26 | #include "SynTree/Initializer.h" |
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[f006f01] | 27 | #include "SymTab/Mangler.h" |
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| 28 | #include "Common/ScopedMap.h" |
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[1132b62] | 29 | #include "ResolvExpr/typeops.h" |
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[6eb8948] | 30 | |
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| 31 | namespace Tuples { |
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[3c13c03] | 32 | namespace { |
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| 33 | class UniqueExprExpander : public GenPoly::DeclMutator { |
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| 34 | public: |
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| 35 | typedef GenPoly::DeclMutator Parent; |
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| 36 | virtual Expression * mutate( UniqueExpr * unqExpr ); |
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| 37 | std::map< Expression *, ObjectDecl * > decls; |
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| 38 | }; |
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| 39 | |
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| 40 | class TupleAssignExpander : public Mutator { |
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| 41 | public: |
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| 42 | typedef Mutator Parent; |
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| 43 | virtual Expression * mutate( TupleAssignExpr * tupleExpr ); |
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| 44 | }; |
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| 45 | |
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| 46 | class TupleTypeReplacer : public GenPoly::DeclMutator { |
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| 47 | public: |
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| 48 | typedef GenPoly::DeclMutator Parent; |
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| 49 | |
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| 50 | virtual Type * mutate( TupleType * tupleType ); |
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| 51 | |
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| 52 | virtual CompoundStmt * mutate( CompoundStmt * stmt ) { |
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| 53 | typeMap.beginScope(); |
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| 54 | stmt = Parent::mutate( stmt ); |
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| 55 | typeMap.endScope(); |
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| 56 | return stmt; |
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| 57 | } |
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| 58 | private: |
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| 59 | ScopedMap< std::string, StructDecl * > typeMap; |
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| 60 | }; |
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| 61 | |
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| 62 | class TupleIndexExpander : public Mutator { |
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| 63 | public: |
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| 64 | typedef Mutator Parent; |
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| 65 | virtual Expression * mutate( TupleIndexExpr * tupleExpr ); |
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| 66 | }; |
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| 67 | |
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| 68 | class TupleExprExpander : public Mutator { |
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| 69 | public: |
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| 70 | typedef Mutator Parent; |
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| 71 | virtual Expression * mutate( TupleExpr * tupleExpr ); |
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| 72 | }; |
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| 73 | } |
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[f006f01] | 74 | |
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[aefcc3b] | 75 | void expandUniqueExpr( std::list< Declaration * > & translationUnit ) { |
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[3c13c03] | 76 | UniqueExprExpander unqExpander; |
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| 77 | unqExpander.mutateDeclarationList( translationUnit ); |
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[aefcc3b] | 78 | } |
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[3c13c03] | 79 | |
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[aefcc3b] | 80 | void expandTuples( std::list< Declaration * > & translationUnit ) { |
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[3c13c03] | 81 | TupleAssignExpander assnExpander; |
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| 82 | mutateAll( translationUnit, assnExpander ); |
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[f006f01] | 83 | |
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| 84 | TupleTypeReplacer replacer; |
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| 85 | replacer.mutateDeclarationList( translationUnit ); |
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[3c13c03] | 86 | |
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| 87 | TupleIndexExpander idxExpander; |
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| 88 | mutateAll( translationUnit, idxExpander ); |
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| 89 | |
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| 90 | TupleExprExpander exprExpander; |
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| 91 | mutateAll( translationUnit, exprExpander ); |
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| 92 | } |
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| 93 | |
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| 94 | Expression * UniqueExprExpander::mutate( UniqueExpr * unqExpr ) { |
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| 95 | static UniqueName tempNamer( "_unq_expr_" ); |
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| 96 | unqExpr = safe_dynamic_cast< UniqueExpr * > ( Parent::mutate( unqExpr ) ); |
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| 97 | if ( ! decls.count( unqExpr->get_expr() ) ) { |
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| 98 | // xxx - it's possible (likely?) that expressions can appear in the wrong order because of this. Need to ensure they're placed in the correct location. |
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| 99 | ObjectDecl * decl = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, nullptr, unqExpr->get_result()->clone(), new SingleInit( unqExpr->get_expr()->clone() ) ); |
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| 100 | decls[unqExpr->get_expr()] = decl; |
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| 101 | addDeclaration( decl ); |
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| 102 | } |
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| 103 | return new VariableExpr( decls[unqExpr->get_expr()] ); |
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[6eb8948] | 104 | } |
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| 105 | |
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[3c13c03] | 106 | Expression * TupleAssignExpander::mutate( TupleAssignExpr * assnExpr ) { |
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| 107 | // xxx - Parent::mutate? |
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[6eb8948] | 108 | CompoundStmt * compoundStmt = new CompoundStmt( noLabels ); |
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| 109 | std::list< Statement * > & stmts = compoundStmt->get_kids(); |
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[3c13c03] | 110 | for ( ObjectDecl * obj : assnExpr->get_tempDecls() ) { |
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[6eb8948] | 111 | stmts.push_back( new DeclStmt( noLabels, obj ) ); |
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| 112 | } |
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[3c13c03] | 113 | TupleExpr * tupleExpr = new TupleExpr( assnExpr->get_assigns() ); |
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| 114 | assert( tupleExpr->get_result() ); |
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| 115 | stmts.push_back( new ExprStmt( noLabels, tupleExpr ) ); |
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| 116 | assnExpr->get_tempDecls().clear(); |
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| 117 | assnExpr->get_assigns().clear(); |
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| 118 | delete assnExpr; |
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[6eb8948] | 119 | return new StmtExpr( compoundStmt ); |
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| 120 | } |
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| 121 | |
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[f006f01] | 122 | Type * TupleTypeReplacer::mutate( TupleType * tupleType ) { |
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| 123 | std::string mangleName = SymTab::Mangler::mangleType( tupleType ); |
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| 124 | TupleType * newType = safe_dynamic_cast< TupleType * > ( Parent::mutate( tupleType ) ); |
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| 125 | if ( ! typeMap.count( mangleName ) ) { |
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| 126 | // generate struct type to replace tuple type |
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| 127 | StructDecl * decl = new StructDecl( "_tuple_type_" + mangleName ); |
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| 128 | decl->set_body( true ); |
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| 129 | int cnt = 0; |
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| 130 | for ( Type * t : *newType ) { |
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| 131 | decl->get_members().push_back( new ObjectDecl( "field_"+std::to_string(++cnt), DeclarationNode::NoStorageClass, LinkageSpec::C, nullptr, t->clone(), nullptr ) ); |
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| 132 | } |
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| 133 | typeMap[mangleName] = decl; |
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| 134 | addDeclaration( decl ); |
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| 135 | } |
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[aa8f9df] | 136 | Type::Qualifiers qualifiers = newType->get_qualifiers(); |
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[f006f01] | 137 | delete newType; |
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[aa8f9df] | 138 | return new StructInstType( qualifiers, typeMap[mangleName] ); |
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[f006f01] | 139 | } |
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| 140 | |
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[3c13c03] | 141 | Expression * TupleIndexExpander::mutate( TupleIndexExpr * tupleExpr ) { |
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| 142 | Expression * tuple = maybeMutate( tupleExpr->get_tuple(), *this ); |
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| 143 | assert( tuple ); |
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| 144 | tupleExpr->set_tuple( nullptr ); |
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| 145 | unsigned int idx = tupleExpr->get_index(); |
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| 146 | delete tupleExpr; |
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| 147 | |
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| 148 | StructInstType * type = safe_dynamic_cast< StructInstType * >( tuple->get_result() ); |
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| 149 | StructDecl * structDecl = type->get_baseStruct(); |
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| 150 | assert( structDecl->get_members().size() > idx ); |
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| 151 | Declaration * member = *std::next(structDecl->get_members().begin(), idx); |
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| 152 | return new MemberExpr( safe_dynamic_cast< DeclarationWithType * >( member ), tuple ); |
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| 153 | } |
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| 154 | |
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[65660bd] | 155 | Expression * replaceTupleExpr( Type * result, const std::list< Expression * > & exprs ) { |
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| 156 | if ( result->isVoid() ) { |
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| 157 | // void result - don't need to produce a value for cascading - just output a chain of comma exprs |
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| 158 | assert( ! exprs.empty() ); |
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| 159 | std::list< Expression * >::const_iterator iter = exprs.begin(); |
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| 160 | Expression * expr = *iter++; |
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| 161 | for ( ; iter != exprs.end(); ++iter ) { |
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| 162 | expr = new CommaExpr( expr, *iter ); |
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| 163 | } |
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| 164 | return expr; |
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| 165 | } else { |
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| 166 | // typed tuple expression - produce a compound literal which performs each of the expressions |
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| 167 | // as a distinct part of its initializer - the produced compound literal may be used as part of |
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| 168 | // another expression |
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| 169 | std::list< Initializer * > inits; |
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| 170 | for ( Expression * expr : exprs ) { |
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| 171 | inits.push_back( new SingleInit( expr ) ); |
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| 172 | } |
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| 173 | return new CompoundLiteralExpr( result, new ListInit( inits ) ); |
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[3c13c03] | 174 | } |
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| 175 | } |
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| 176 | |
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[65660bd] | 177 | Expression * TupleExprExpander::mutate( TupleExpr * tupleExpr ) { |
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| 178 | Type * result = tupleExpr->get_result(); |
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| 179 | std::list< Expression * > exprs = tupleExpr->get_exprs(); |
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| 180 | assert( result ); |
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| 181 | |
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| 182 | tupleExpr->set_result( nullptr ); |
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| 183 | tupleExpr->get_exprs().clear(); |
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| 184 | delete tupleExpr; |
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| 185 | |
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| 186 | return replaceTupleExpr( result, exprs ); |
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| 187 | } |
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| 188 | |
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| 189 | Type * makeTupleType( const std::list< Expression * > & exprs ) { |
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| 190 | // produce the TupleType which aggregates the types of the exprs |
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[3c13c03] | 191 | TupleType *tupleType = new TupleType( Type::Qualifiers(true, true, true, true, true, false) ); |
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| 192 | Type::Qualifiers &qualifiers = tupleType->get_qualifiers(); |
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| 193 | for ( Expression * expr : exprs ) { |
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| 194 | assert( expr->get_result() ); |
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[65660bd] | 195 | if ( expr->get_result()->isVoid() ) { |
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| 196 | // if the type of any expr is void, the type of the entire tuple is void |
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| 197 | delete tupleType; |
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| 198 | return new VoidType( Type::Qualifiers() ); |
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| 199 | } |
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[3c13c03] | 200 | Type * type = expr->get_result()->clone(); |
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| 201 | tupleType->get_types().push_back( type ); |
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[65660bd] | 202 | // the qualifiers on the tuple type are the qualifiers that exist on all component types |
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[3c13c03] | 203 | qualifiers &= type->get_qualifiers(); |
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| 204 | } // for |
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| 205 | return tupleType; |
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| 206 | } |
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[65660bd] | 207 | |
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| 208 | namespace { |
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| 209 | /// determines if impurity (read: side-effects) may exist in a piece of code. Currently gives a very crude approximation, wherein any function call expression means the code may be impure |
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| 210 | class ImpurityDetector : public Visitor { |
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| 211 | public: |
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| 212 | typedef Visitor Parent; |
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| 213 | virtual void visit( ApplicationExpr * appExpr ) { maybeImpure = true; } |
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| 214 | virtual void visit( UntypedExpr * untypedExpr ) { maybeImpure = true; } |
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| 215 | bool maybeImpure = false; |
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| 216 | }; |
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| 217 | } // namespace |
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| 218 | |
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| 219 | bool maybeImpure( Expression * expr ) { |
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| 220 | ImpurityDetector detector; |
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| 221 | expr->accept( detector ); |
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| 222 | return detector.maybeImpure; |
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| 223 | } |
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[6eb8948] | 224 | } // namespace Tuples |
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| 225 | |
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| 226 | // Local Variables: // |
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| 227 | // tab-width: 4 // |
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| 228 | // mode: c++ // |
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| 229 | // compile-command: "make install" // |
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| 230 | // End: // |
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| 231 | |
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