[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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[f0121d7] | 30 | #include "InitTweak/GenInit.h" |
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[6eb8948] | 31 | |
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| 32 | namespace Tuples { |
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[3c13c03] | 33 | namespace { |
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[5f5083e] | 34 | class MemberTupleExpander final : public Mutator { |
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[bf32bb8] | 35 | public: |
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| 36 | typedef Mutator Parent; |
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[5f5083e] | 37 | using Parent::mutate; |
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| 38 | |
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| 39 | virtual Expression * mutate( UntypedMemberExpr * memberExpr ) override; |
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[bf32bb8] | 40 | }; |
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| 41 | |
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[5f5083e] | 42 | class UniqueExprExpander final : public GenPoly::DeclMutator { |
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[3c13c03] | 43 | public: |
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| 44 | typedef GenPoly::DeclMutator Parent; |
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[5f5083e] | 45 | using Parent::mutate; |
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[141b786] | 46 | |
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[5f5083e] | 47 | virtual Expression * mutate( UniqueExpr * unqExpr ) override; |
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[141b786] | 48 | |
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| 49 | std::map< int, Expression * > decls; // not vector, because order added may not be increasing order |
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| 50 | |
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| 51 | ~UniqueExprExpander() { |
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| 52 | for ( std::pair<const int, Expression *> & p : decls ) { |
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| 53 | delete p.second; |
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| 54 | } |
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| 55 | } |
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[3c13c03] | 56 | }; |
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| 57 | |
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| 58 | class TupleAssignExpander : public Mutator { |
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| 59 | public: |
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| 60 | typedef Mutator Parent; |
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[5f5083e] | 61 | using Parent::mutate; |
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| 62 | |
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[3c13c03] | 63 | virtual Expression * mutate( TupleAssignExpr * tupleExpr ); |
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| 64 | }; |
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| 65 | |
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| 66 | class TupleTypeReplacer : public GenPoly::DeclMutator { |
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| 67 | public: |
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| 68 | typedef GenPoly::DeclMutator Parent; |
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[5f5083e] | 69 | using Parent::mutate; |
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[3c13c03] | 70 | |
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[5f5083e] | 71 | virtual Type * mutate( TupleType * tupleType ) override; |
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[3c13c03] | 72 | |
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[5f5083e] | 73 | virtual CompoundStmt * mutate( CompoundStmt * stmt ) override { |
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[3c13c03] | 74 | typeMap.beginScope(); |
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| 75 | stmt = Parent::mutate( stmt ); |
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| 76 | typeMap.endScope(); |
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| 77 | return stmt; |
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| 78 | } |
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| 79 | private: |
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| 80 | ScopedMap< std::string, StructDecl * > typeMap; |
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| 81 | }; |
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| 82 | |
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[5f5083e] | 83 | class TupleIndexExpander final : public Mutator { |
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[3c13c03] | 84 | public: |
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| 85 | typedef Mutator Parent; |
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[5f5083e] | 86 | using Parent::mutate; |
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| 87 | |
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| 88 | virtual Expression * mutate( TupleIndexExpr * tupleExpr ) override; |
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[3c13c03] | 89 | }; |
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| 90 | |
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[5f5083e] | 91 | class TupleExprExpander final : public Mutator { |
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[3c13c03] | 92 | public: |
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| 93 | typedef Mutator Parent; |
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[5f5083e] | 94 | using Parent::mutate; |
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[d9fa60a] | 95 | |
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[5f5083e] | 96 | virtual Expression * mutate( TupleExpr * tupleExpr ) override; |
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[3c13c03] | 97 | }; |
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| 98 | } |
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[f006f01] | 99 | |
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[bf32bb8] | 100 | void expandMemberTuples( std::list< Declaration * > & translationUnit ) { |
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| 101 | MemberTupleExpander expander; |
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| 102 | mutateAll( translationUnit, expander ); |
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| 103 | } |
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| 104 | |
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[aefcc3b] | 105 | void expandUniqueExpr( std::list< Declaration * > & translationUnit ) { |
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[3c13c03] | 106 | UniqueExprExpander unqExpander; |
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| 107 | unqExpander.mutateDeclarationList( translationUnit ); |
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[aefcc3b] | 108 | } |
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[3c13c03] | 109 | |
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[aefcc3b] | 110 | void expandTuples( std::list< Declaration * > & translationUnit ) { |
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[3c13c03] | 111 | TupleAssignExpander assnExpander; |
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| 112 | mutateAll( translationUnit, assnExpander ); |
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[f006f01] | 113 | |
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| 114 | TupleTypeReplacer replacer; |
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| 115 | replacer.mutateDeclarationList( translationUnit ); |
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[3c13c03] | 116 | |
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| 117 | TupleIndexExpander idxExpander; |
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| 118 | mutateAll( translationUnit, idxExpander ); |
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| 119 | |
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| 120 | TupleExprExpander exprExpander; |
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| 121 | mutateAll( translationUnit, exprExpander ); |
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| 122 | } |
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| 123 | |
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[bf32bb8] | 124 | namespace { |
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| 125 | /// given a expression representing the member and an expression representing the aggregate, |
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| 126 | /// reconstructs a flattened UntypedMemberExpr with the right precedence |
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[141b786] | 127 | Expression * reconstructMemberExpr( Expression * member, Expression * aggr ) { |
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[bf32bb8] | 128 | if ( UntypedMemberExpr * memberExpr = dynamic_cast< UntypedMemberExpr * >( member ) ) { |
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| 129 | // construct a new UntypedMemberExpr with the correct structure , and recursively |
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| 130 | // expand that member expression. |
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| 131 | MemberTupleExpander expander; |
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| 132 | UntypedMemberExpr * newMemberExpr = new UntypedMemberExpr( memberExpr->get_member(), new UntypedMemberExpr( memberExpr->get_aggregate(), aggr->clone() ) ); |
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| 133 | |
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| 134 | memberExpr->set_member(nullptr); |
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| 135 | memberExpr->set_aggregate(nullptr); |
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| 136 | delete memberExpr; |
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| 137 | return newMemberExpr->acceptMutator( expander ); |
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| 138 | } else { |
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| 139 | // not a member expression, so there is nothing to do but attach and return |
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| 140 | return new UntypedMemberExpr( member, aggr->clone() ); |
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| 141 | } |
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| 142 | } |
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| 143 | } |
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| 144 | |
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| 145 | Expression * MemberTupleExpander::mutate( UntypedMemberExpr * memberExpr ) { |
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| 146 | if ( TupleExpr * tupleExpr = dynamic_cast< TupleExpr * > ( memberExpr->get_member() ) ) { |
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[141b786] | 147 | Expression * aggr = memberExpr->get_aggregate()->clone()->acceptMutator( *this ); |
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| 148 | // aggregate expressions which might be impure must be wrapped in unique expressions |
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| 149 | // xxx - if there's a member-tuple expression nested in the aggregate, this currently generates the wrong code if a UniqueExpr is not used, and it's purely an optimization to remove the UniqueExpr |
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| 150 | // if ( Tuples::maybeImpure( memberExpr->get_aggregate() ) ) aggr = new UniqueExpr( aggr ); |
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| 151 | aggr = new UniqueExpr( aggr ); |
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[bf32bb8] | 152 | for ( Expression *& expr : tupleExpr->get_exprs() ) { |
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[141b786] | 153 | expr = reconstructMemberExpr( expr, aggr ); |
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[bf32bb8] | 154 | } |
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[141b786] | 155 | delete aggr; |
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[bf32bb8] | 156 | return tupleExpr; |
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| 157 | } else { |
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[f0121d7] | 158 | // there may be a tuple expr buried in the aggregate |
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| 159 | // xxx - this is a memory leak |
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| 160 | return new UntypedMemberExpr( memberExpr->get_member()->clone(), memberExpr->get_aggregate()->acceptMutator( *this ) ); |
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[bf32bb8] | 161 | } |
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| 162 | } |
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| 163 | |
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[3c13c03] | 164 | Expression * UniqueExprExpander::mutate( UniqueExpr * unqExpr ) { |
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| 165 | unqExpr = safe_dynamic_cast< UniqueExpr * > ( Parent::mutate( unqExpr ) ); |
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[141b786] | 166 | const int id = unqExpr->get_id(); |
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| 167 | |
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| 168 | // on first time visiting a unique expr with a particular ID, generate the expression that replaces all UniqueExprs with that ID, |
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| 169 | // and lookup on subsequent hits. This ensures that all unique exprs with the same ID reference the same variable. |
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| 170 | if ( ! decls.count( id ) ) { |
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| 171 | Expression * assignUnq; |
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| 172 | Expression * var = unqExpr->get_var(); |
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| 173 | if ( unqExpr->get_object() ) { |
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| 174 | // an object was generated to represent this unique expression -- it should be added to the list of declarations now |
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| 175 | addDeclaration( unqExpr->get_object() ); |
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| 176 | unqExpr->set_object( nullptr ); |
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| 177 | // steal the expr from the unqExpr |
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| 178 | assignUnq = UntypedExpr::createAssign( unqExpr->get_var()->clone(), unqExpr->get_expr() ); |
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| 179 | unqExpr->set_expr( nullptr ); |
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| 180 | } else { |
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| 181 | // steal the already generated assignment to var from the unqExpr - this has been generated by FixInit |
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| 182 | Expression * expr = unqExpr->get_expr(); |
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| 183 | CommaExpr * commaExpr = safe_dynamic_cast< CommaExpr * >( expr ); |
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| 184 | assignUnq = commaExpr->get_arg1(); |
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| 185 | commaExpr->set_arg1( nullptr ); |
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| 186 | } |
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| 187 | BasicType * boolType = new BasicType( Type::Qualifiers(), BasicType::Bool ); |
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| 188 | ObjectDecl * finished = new ObjectDecl( toString( "_unq_expr_finished_", id ), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, nullptr, new BasicType( Type::Qualifiers(), BasicType::Bool ), new SingleInit( new ConstantExpr( Constant( boolType->clone(), "0" ) ), noDesignators ) ); |
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| 189 | addDeclaration( finished ); |
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| 190 | // (finished ? _unq_expr_N : (_unq_expr_N = <unqExpr->get_expr()>, finished = 1, _unq_expr_N)) |
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| 191 | // This pattern ensures that each unique expression is evaluated once, regardless of evaluation order of the generated C code. |
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| 192 | Expression * assignFinished = UntypedExpr::createAssign( new VariableExpr(finished), new ConstantExpr( Constant( boolType->clone(), "1" ) ) ); |
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| 193 | ConditionalExpr * condExpr = new ConditionalExpr( new VariableExpr( finished ), var->clone(), |
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| 194 | new CommaExpr( new CommaExpr( assignUnq, assignFinished ), var->clone() ) ); |
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| 195 | condExpr->set_result( var->get_result()->clone() ); |
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[d5556a3] | 196 | condExpr->set_env( maybeClone( unqExpr->get_env() ) ); |
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[141b786] | 197 | decls[id] = condExpr; |
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[3c13c03] | 198 | } |
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[141b786] | 199 | delete unqExpr; |
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| 200 | return decls[id]->clone(); |
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[6eb8948] | 201 | } |
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| 202 | |
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[3c13c03] | 203 | Expression * TupleAssignExpander::mutate( TupleAssignExpr * assnExpr ) { |
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[141b786] | 204 | assnExpr = safe_dynamic_cast< TupleAssignExpr * >( Parent::mutate( assnExpr ) ); |
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[d5556a3] | 205 | StmtExpr * ret = assnExpr->get_stmtExpr(); |
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| 206 | assnExpr->set_stmtExpr( nullptr ); |
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| 207 | // move env to StmtExpr |
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| 208 | ret->set_env( assnExpr->get_env() ); |
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| 209 | assnExpr->set_env( nullptr ); |
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[3c13c03] | 210 | delete assnExpr; |
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[d5556a3] | 211 | return ret; |
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[6eb8948] | 212 | } |
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| 213 | |
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[f006f01] | 214 | Type * TupleTypeReplacer::mutate( TupleType * tupleType ) { |
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| 215 | std::string mangleName = SymTab::Mangler::mangleType( tupleType ); |
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[d9fa60a] | 216 | tupleType = safe_dynamic_cast< TupleType * > ( Parent::mutate( tupleType ) ); |
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[f006f01] | 217 | if ( ! typeMap.count( mangleName ) ) { |
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| 218 | // generate struct type to replace tuple type |
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[d5556a3] | 219 | // xxx - should fix this to only generate one tuple struct for each number of type parameters |
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[f006f01] | 220 | StructDecl * decl = new StructDecl( "_tuple_type_" + mangleName ); |
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| 221 | decl->set_body( true ); |
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[d9fa60a] | 222 | for ( size_t i = 0; i < tupleType->size(); ++i ) { |
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| 223 | TypeDecl * tyParam = new TypeDecl( toString("tuple_param_", i), DeclarationNode::NoStorageClass, nullptr, TypeDecl::Any ); |
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| 224 | decl->get_members().push_back( new ObjectDecl( toString("field_", i), DeclarationNode::NoStorageClass, LinkageSpec::C, nullptr, new TypeInstType( Type::Qualifiers(), tyParam->get_name(), tyParam ), nullptr ) ); |
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| 225 | decl->get_parameters().push_back( tyParam ); |
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[f006f01] | 226 | } |
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| 227 | typeMap[mangleName] = decl; |
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| 228 | addDeclaration( decl ); |
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| 229 | } |
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[d9fa60a] | 230 | Type::Qualifiers qualifiers = tupleType->get_qualifiers(); |
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| 231 | |
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| 232 | StructDecl * decl = typeMap[mangleName]; |
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| 233 | StructInstType * newType = new StructInstType( qualifiers, decl ); |
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| 234 | for ( Type * t : *tupleType ) { |
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| 235 | newType->get_parameters().push_back( new TypeExpr( t->clone() ) ); |
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| 236 | } |
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| 237 | delete tupleType; |
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| 238 | return newType; |
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[f006f01] | 239 | } |
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| 240 | |
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[3c13c03] | 241 | Expression * TupleIndexExpander::mutate( TupleIndexExpr * tupleExpr ) { |
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| 242 | Expression * tuple = maybeMutate( tupleExpr->get_tuple(), *this ); |
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| 243 | assert( tuple ); |
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| 244 | tupleExpr->set_tuple( nullptr ); |
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| 245 | unsigned int idx = tupleExpr->get_index(); |
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[d5556a3] | 246 | TypeSubstitution * env = tupleExpr->get_env(); |
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| 247 | tupleExpr->set_env( nullptr ); |
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[3c13c03] | 248 | delete tupleExpr; |
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| 249 | |
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| 250 | StructInstType * type = safe_dynamic_cast< StructInstType * >( tuple->get_result() ); |
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| 251 | StructDecl * structDecl = type->get_baseStruct(); |
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| 252 | assert( structDecl->get_members().size() > idx ); |
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| 253 | Declaration * member = *std::next(structDecl->get_members().begin(), idx); |
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[d5556a3] | 254 | MemberExpr * memExpr = new MemberExpr( safe_dynamic_cast< DeclarationWithType * >( member ), tuple ); |
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| 255 | memExpr->set_env( env ); |
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| 256 | return memExpr; |
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[3c13c03] | 257 | } |
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| 258 | |
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[d5556a3] | 259 | Expression * replaceTupleExpr( Type * result, const std::list< Expression * > & exprs, TypeSubstitution * env ) { |
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[65660bd] | 260 | if ( result->isVoid() ) { |
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| 261 | // void result - don't need to produce a value for cascading - just output a chain of comma exprs |
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| 262 | assert( ! exprs.empty() ); |
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| 263 | std::list< Expression * >::const_iterator iter = exprs.begin(); |
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[d5556a3] | 264 | Expression * expr = new CastExpr( *iter++ ); |
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[65660bd] | 265 | for ( ; iter != exprs.end(); ++iter ) { |
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[d5556a3] | 266 | expr = new CommaExpr( expr, new CastExpr( *iter ) ); |
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[65660bd] | 267 | } |
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[d5556a3] | 268 | expr->set_env( env ); |
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[65660bd] | 269 | return expr; |
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| 270 | } else { |
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| 271 | // typed tuple expression - produce a compound literal which performs each of the expressions |
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| 272 | // as a distinct part of its initializer - the produced compound literal may be used as part of |
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| 273 | // another expression |
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| 274 | std::list< Initializer * > inits; |
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| 275 | for ( Expression * expr : exprs ) { |
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| 276 | inits.push_back( new SingleInit( expr ) ); |
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| 277 | } |
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[d5556a3] | 278 | Expression * expr = new CompoundLiteralExpr( result, new ListInit( inits ) ); |
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| 279 | expr->set_env( env ); |
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| 280 | return expr; |
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[3c13c03] | 281 | } |
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| 282 | } |
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| 283 | |
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[65660bd] | 284 | Expression * TupleExprExpander::mutate( TupleExpr * tupleExpr ) { |
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[bf32bb8] | 285 | // recursively expand sub-tuple-expressions |
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| 286 | tupleExpr = safe_dynamic_cast<TupleExpr *>(Parent::mutate(tupleExpr)); |
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[65660bd] | 287 | Type * result = tupleExpr->get_result(); |
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| 288 | std::list< Expression * > exprs = tupleExpr->get_exprs(); |
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| 289 | assert( result ); |
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[d5556a3] | 290 | TypeSubstitution * env = tupleExpr->get_env(); |
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[65660bd] | 291 | |
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[bf32bb8] | 292 | // remove data from shell and delete it |
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[65660bd] | 293 | tupleExpr->set_result( nullptr ); |
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| 294 | tupleExpr->get_exprs().clear(); |
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[d5556a3] | 295 | tupleExpr->set_env( nullptr ); |
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[65660bd] | 296 | delete tupleExpr; |
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| 297 | |
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[d5556a3] | 298 | return replaceTupleExpr( result, exprs, env ); |
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[65660bd] | 299 | } |
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| 300 | |
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| 301 | Type * makeTupleType( const std::list< Expression * > & exprs ) { |
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| 302 | // produce the TupleType which aggregates the types of the exprs |
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[3c13c03] | 303 | TupleType *tupleType = new TupleType( Type::Qualifiers(true, true, true, true, true, false) ); |
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| 304 | Type::Qualifiers &qualifiers = tupleType->get_qualifiers(); |
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| 305 | for ( Expression * expr : exprs ) { |
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| 306 | assert( expr->get_result() ); |
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[65660bd] | 307 | if ( expr->get_result()->isVoid() ) { |
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| 308 | // if the type of any expr is void, the type of the entire tuple is void |
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| 309 | delete tupleType; |
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| 310 | return new VoidType( Type::Qualifiers() ); |
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| 311 | } |
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[3c13c03] | 312 | Type * type = expr->get_result()->clone(); |
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| 313 | tupleType->get_types().push_back( type ); |
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[65660bd] | 314 | // the qualifiers on the tuple type are the qualifiers that exist on all component types |
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[3c13c03] | 315 | qualifiers &= type->get_qualifiers(); |
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| 316 | } // for |
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| 317 | return tupleType; |
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| 318 | } |
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[65660bd] | 319 | |
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| 320 | namespace { |
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| 321 | /// 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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| 322 | class ImpurityDetector : public Visitor { |
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| 323 | public: |
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| 324 | typedef Visitor Parent; |
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| 325 | virtual void visit( ApplicationExpr * appExpr ) { maybeImpure = true; } |
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| 326 | virtual void visit( UntypedExpr * untypedExpr ) { maybeImpure = true; } |
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| 327 | bool maybeImpure = false; |
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| 328 | }; |
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| 329 | } // namespace |
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| 330 | |
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| 331 | bool maybeImpure( Expression * expr ) { |
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| 332 | ImpurityDetector detector; |
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| 333 | expr->accept( detector ); |
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| 334 | return detector.maybeImpure; |
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| 335 | } |
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[6eb8948] | 336 | } // namespace Tuples |
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| 337 | |
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| 338 | // Local Variables: // |
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| 339 | // tab-width: 4 // |
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| 340 | // mode: c++ // |
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| 341 | // compile-command: "make install" // |
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| 342 | // End: // |
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