[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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[a0fdbd5] | 7 | // GenInit.cc -- |
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[51587aa] | 8 | // |
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[cf16f94] | 9 | // Author : Rob Schluntz |
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[51587aa] | 10 | // Created On : Mon May 18 07:44:20 2015 |
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[3a5131ed] | 11 | // Last Modified By : Peter A. Buhr |
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[a7c90d4] | 12 | // Last Modified On : Tue Mar 7 07:51:38 2017 |
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| 13 | // Update Count : 179 |
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[51587aa] | 14 | // |
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[a08ba92] | 15 | |
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[974906e2] | 16 | #include <stack> |
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| 17 | #include <list> |
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[a0fdbd5] | 18 | #include "GenInit.h" |
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[7b3f66b] | 19 | #include "InitTweak.h" |
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[42e2ad7] | 20 | #include "SynTree/Declaration.h" |
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| 21 | #include "SynTree/Type.h" |
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| 22 | #include "SynTree/Expression.h" |
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| 23 | #include "SynTree/Statement.h" |
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| 24 | #include "SynTree/Initializer.h" |
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| 25 | #include "SynTree/Mutator.h" |
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[620cb95] | 26 | #include "SymTab/Autogen.h" |
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[1ba88a0] | 27 | #include "SymTab/Mangler.h" |
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[1e9d87b] | 28 | #include "GenPoly/PolyMutator.h" |
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[5f98ce5] | 29 | #include "GenPoly/DeclMutator.h" |
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[1ba88a0] | 30 | #include "GenPoly/ScopedSet.h" |
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[65660bd] | 31 | #include "ResolvExpr/typeops.h" |
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[42e2ad7] | 32 | |
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| 33 | namespace InitTweak { |
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[a08ba92] | 34 | namespace { |
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| 35 | const std::list<Label> noLabels; |
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[5b40f30] | 36 | const std::list<Expression *> noDesignators; |
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[a08ba92] | 37 | } |
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[1e9d87b] | 38 | |
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[62e5546] | 39 | class ReturnFixer final : public GenPoly::PolyMutator { |
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[cf16f94] | 40 | public: |
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[a0fdbd5] | 41 | /// consistently allocates a temporary variable for the return value |
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| 42 | /// of a function so that anything which the resolver decides can be constructed |
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[02c7d04] | 43 | /// into the return type of a function can be returned. |
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[a0fdbd5] | 44 | static void makeReturnTemp( std::list< Declaration * > &translationUnit ); |
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[02c7d04] | 45 | |
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[a0fdbd5] | 46 | ReturnFixer(); |
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[db4ecc5] | 47 | |
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[cce9429] | 48 | typedef GenPoly::PolyMutator Parent; |
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| 49 | using Parent::mutate; |
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[62e5546] | 50 | virtual DeclarationWithType * mutate( FunctionDecl *functionDecl ) override; |
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| 51 | virtual Statement * mutate( ReturnStmt * returnStmt ) override; |
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[1e9d87b] | 52 | |
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| 53 | protected: |
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[65660bd] | 54 | FunctionType * ftype; |
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[cf16f94] | 55 | std::string funcName; |
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| 56 | }; |
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[42e2ad7] | 57 | |
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[62e5546] | 58 | class CtorDtor final : public GenPoly::PolyMutator { |
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[974906e2] | 59 | public: |
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[1ba88a0] | 60 | typedef GenPoly::PolyMutator Parent; |
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| 61 | using Parent::mutate; |
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[02c7d04] | 62 | /// create constructor and destructor statements for object declarations. |
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[5f98ce5] | 63 | /// the actual call statements will be added in after the resolver has run |
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| 64 | /// so that the initializer expression is only removed if a constructor is found |
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| 65 | /// and the same destructor call is inserted in all of the appropriate locations. |
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[02c7d04] | 66 | static void generateCtorDtor( std::list< Declaration * > &translationUnit ); |
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[974906e2] | 67 | |
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[62e5546] | 68 | virtual DeclarationWithType * mutate( ObjectDecl * ) override; |
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| 69 | virtual DeclarationWithType * mutate( FunctionDecl *functionDecl ) override; |
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[5f98ce5] | 70 | // should not traverse into any of these declarations to find objects |
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| 71 | // that need to be constructed or destructed |
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[62e5546] | 72 | virtual Declaration* mutate( StructDecl *aggregateDecl ) override; |
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| 73 | virtual Declaration* mutate( UnionDecl *aggregateDecl ) override { return aggregateDecl; } |
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| 74 | virtual Declaration* mutate( EnumDecl *aggregateDecl ) override { return aggregateDecl; } |
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| 75 | virtual Declaration* mutate( TraitDecl *aggregateDecl ) override { return aggregateDecl; } |
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| 76 | virtual TypeDecl* mutate( TypeDecl *typeDecl ) override { return typeDecl; } |
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| 77 | virtual Declaration* mutate( TypedefDecl *typeDecl ) override { return typeDecl; } |
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[974906e2] | 78 | |
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[62e5546] | 79 | virtual Type * mutate( FunctionType *funcType ) override { return funcType; } |
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[db4ecc5] | 80 | |
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[62e5546] | 81 | virtual CompoundStmt * mutate( CompoundStmt * compoundStmt ) override; |
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[1ba88a0] | 82 | |
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| 83 | private: |
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| 84 | // set of mangled type names for which a constructor or destructor exists in the current scope. |
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| 85 | // these types require a ConstructorInit node to be generated, anything else is a POD type and thus |
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| 86 | // should not have a ConstructorInit generated. |
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| 87 | |
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| 88 | bool isManaged( ObjectDecl * objDecl ) const ; // determine if object is managed |
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[65660bd] | 89 | bool isManaged( Type * type ) const; // determine if type is managed |
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[1ba88a0] | 90 | void handleDWT( DeclarationWithType * dwt ); // add type to managed if ctor/dtor |
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| 91 | GenPoly::ScopedSet< std::string > managedTypes; |
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| 92 | bool inFunction = false; |
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[974906e2] | 93 | }; |
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| 94 | |
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[62e5546] | 95 | class HoistArrayDimension final : public GenPoly::DeclMutator { |
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[5f98ce5] | 96 | public: |
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| 97 | typedef GenPoly::DeclMutator Parent; |
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| 98 | |
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| 99 | /// hoist dimension from array types in object declaration so that it uses a single |
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| 100 | /// const variable of type size_t, so that side effecting array dimensions are only |
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| 101 | /// computed once. |
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| 102 | static void hoistArrayDimension( std::list< Declaration * > & translationUnit ); |
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| 103 | |
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| 104 | private: |
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[62e5546] | 105 | using Parent::mutate; |
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| 106 | |
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| 107 | virtual DeclarationWithType * mutate( ObjectDecl * objectDecl ) override; |
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| 108 | virtual DeclarationWithType * mutate( FunctionDecl *functionDecl ) override; |
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[5f98ce5] | 109 | // should not traverse into any of these declarations to find objects |
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| 110 | // that need to be constructed or destructed |
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[62e5546] | 111 | virtual Declaration* mutate( StructDecl *aggregateDecl ) override { return aggregateDecl; } |
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| 112 | virtual Declaration* mutate( UnionDecl *aggregateDecl ) override { return aggregateDecl; } |
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| 113 | virtual Declaration* mutate( EnumDecl *aggregateDecl ) override { return aggregateDecl; } |
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| 114 | virtual Declaration* mutate( TraitDecl *aggregateDecl ) override { return aggregateDecl; } |
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| 115 | virtual TypeDecl* mutate( TypeDecl *typeDecl ) override { return typeDecl; } |
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| 116 | virtual Declaration* mutate( TypedefDecl *typeDecl ) override { return typeDecl; } |
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| 117 | |
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| 118 | virtual Type* mutate( FunctionType *funcType ) override { return funcType; } |
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[5f98ce5] | 119 | |
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| 120 | void hoist( Type * type ); |
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| 121 | |
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[a7c90d4] | 122 | DeclarationNode::StorageClasses storageClasses; |
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[40e636a] | 123 | bool inFunction = false; |
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[5f98ce5] | 124 | }; |
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| 125 | |
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[a0fdbd5] | 126 | void genInit( std::list< Declaration * > & translationUnit ) { |
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| 127 | ReturnFixer::makeReturnTemp( translationUnit ); |
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[5f98ce5] | 128 | HoistArrayDimension::hoistArrayDimension( translationUnit ); |
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[02c7d04] | 129 | CtorDtor::generateCtorDtor( translationUnit ); |
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| 130 | } |
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| 131 | |
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[a0fdbd5] | 132 | void ReturnFixer::makeReturnTemp( std::list< Declaration * > & translationUnit ) { |
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| 133 | ReturnFixer fixer; |
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| 134 | mutateAll( translationUnit, fixer ); |
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[a08ba92] | 135 | } |
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[42e2ad7] | 136 | |
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[9facf3b] | 137 | ReturnFixer::ReturnFixer() {} |
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[cf16f94] | 138 | |
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[a0fdbd5] | 139 | Statement *ReturnFixer::mutate( ReturnStmt *returnStmt ) { |
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[65660bd] | 140 | std::list< DeclarationWithType * > & returnVals = ftype->get_returnVals(); |
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[cf16f94] | 141 | assert( returnVals.size() == 0 || returnVals.size() == 1 ); |
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| 142 | // hands off if the function returns an lvalue - we don't want to allocate a temporary if a variable's address |
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| 143 | // is being returned |
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[cce9429] | 144 | // Note: under the assumption that assignments return *this, checking for ?=? here is an optimization, since it shouldn't be necessary to copy construct `this`. This is a temporary optimization until reference types are added, at which point this should be removed, along with the analogous optimization in copy constructor generation. |
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[7eabc25] | 145 | if ( returnStmt->get_expr() && returnVals.size() == 1 && funcName != "?=?" && ! returnVals.front()->get_type()->get_isLvalue() ) { |
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[cce9429] | 146 | // explicitly construct the return value using the return expression and the retVal object |
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| 147 | assertf( returnVals.front()->get_name() != "", "Function %s has unnamed return value\n", funcName.c_str() ); |
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[5b40f30] | 148 | UntypedExpr *construct = new UntypedExpr( new NameExpr( "?{}" ) ); |
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[cce9429] | 149 | construct->get_args().push_back( new AddressExpr( new VariableExpr( returnVals.front() ) ) ); |
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[5b40f30] | 150 | construct->get_args().push_back( returnStmt->get_expr() ); |
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| 151 | stmtsToAdd.push_back(new ExprStmt(noLabels, construct)); |
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[cf16f94] | 152 | |
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[cce9429] | 153 | // return the retVal object |
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| 154 | returnStmt->set_expr( new VariableExpr( returnVals.front() ) ); |
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[cf16f94] | 155 | } // if |
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| 156 | return returnStmt; |
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| 157 | } |
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| 158 | |
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[a0fdbd5] | 159 | DeclarationWithType* ReturnFixer::mutate( FunctionDecl *functionDecl ) { |
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[65660bd] | 160 | ValueGuard< FunctionType * > oldFtype( ftype ); |
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[1ba88a0] | 161 | ValueGuard< std::string > oldFuncName( funcName ); |
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[1e9d87b] | 162 | |
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[65660bd] | 163 | ftype = functionDecl->get_functionType(); |
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[cf16f94] | 164 | funcName = functionDecl->get_name(); |
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[cce9429] | 165 | return Parent::mutate( functionDecl ); |
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[cf16f94] | 166 | } |
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[974906e2] | 167 | |
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[4d2434a] | 168 | // precompute array dimension expression, because constructor generation may duplicate it, |
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| 169 | // which would be incorrect if it is a side-effecting computation. |
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[5f98ce5] | 170 | void HoistArrayDimension::hoistArrayDimension( std::list< Declaration * > & translationUnit ) { |
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| 171 | HoistArrayDimension hoister; |
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[40e636a] | 172 | hoister.mutateDeclarationList( translationUnit ); |
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[5f98ce5] | 173 | } |
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| 174 | |
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| 175 | DeclarationWithType * HoistArrayDimension::mutate( ObjectDecl * objectDecl ) { |
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[a7c90d4] | 176 | storageClasses = objectDecl->get_storageClasses(); |
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[5f98ce5] | 177 | DeclarationWithType * temp = Parent::mutate( objectDecl ); |
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| 178 | hoist( objectDecl->get_type() ); |
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| 179 | return temp; |
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| 180 | } |
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| 181 | |
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| 182 | void HoistArrayDimension::hoist( Type * type ) { |
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[40e636a] | 183 | // if in function, generate const size_t var |
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[5f98ce5] | 184 | static UniqueName dimensionName( "_array_dim" ); |
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[40e636a] | 185 | |
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[a7c90d4] | 186 | // C doesn't allow variable sized arrays at global scope or for static variables, so don't hoist dimension. |
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[f9cebb5] | 187 | if ( ! inFunction ) return; |
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[a7c90d4] | 188 | if ( storageClasses[ DeclarationNode::StaticClass] ) return; |
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[f9cebb5] | 189 | |
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| 190 | if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) { |
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[5f98ce5] | 191 | if ( ! arrayType->get_dimension() ) return; // xxx - recursive call to hoist? |
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| 192 | |
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[a7c90d4] | 193 | // don't need to hoist dimension if it's a constexpr - only need to if there's potential for side effects. |
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[5f98ce5] | 194 | if ( isConstExpr( arrayType->get_dimension() ) ) return; |
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| 195 | |
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[a7c90d4] | 196 | ObjectDecl * arrayDimension = new ObjectDecl( dimensionName.newName(), storageClasses, LinkageSpec::C, 0, SymTab::SizeType->clone(), new SingleInit( arrayType->get_dimension() ) ); |
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[5f98ce5] | 197 | arrayDimension->get_type()->set_isConst( true ); |
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| 198 | |
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| 199 | arrayType->set_dimension( new VariableExpr( arrayDimension ) ); |
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| 200 | addDeclaration( arrayDimension ); |
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| 201 | |
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| 202 | hoist( arrayType->get_base() ); |
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| 203 | return; |
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| 204 | } |
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| 205 | } |
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[974906e2] | 206 | |
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[40e636a] | 207 | DeclarationWithType * HoistArrayDimension::mutate( FunctionDecl *functionDecl ) { |
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[1ba88a0] | 208 | ValueGuard< bool > oldInFunc( inFunction ); |
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[40e636a] | 209 | inFunction = true; |
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| 210 | DeclarationWithType * decl = Parent::mutate( functionDecl ); |
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| 211 | return decl; |
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| 212 | } |
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| 213 | |
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[02c7d04] | 214 | void CtorDtor::generateCtorDtor( std::list< Declaration * > & translationUnit ) { |
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| 215 | CtorDtor ctordtor; |
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| 216 | mutateAll( translationUnit, ctordtor ); |
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[974906e2] | 217 | } |
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| 218 | |
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[65660bd] | 219 | bool CtorDtor::isManaged( Type * type ) const { |
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[ac9ca96] | 220 | if ( TupleType * tupleType = dynamic_cast< TupleType * > ( type ) ) { |
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| 221 | // tuple is also managed if any of its components are managed |
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| 222 | if ( std::any_of( tupleType->get_types().begin(), tupleType->get_types().end(), [&](Type * type) { return isManaged( type ); }) ) { |
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| 223 | return true; |
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| 224 | } |
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| 225 | } |
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[30b65d8] | 226 | // a type is managed if it appears in the map of known managed types, or if it contains any polymorphism (is a type variable or generic type containing a type variable) |
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| 227 | return managedTypes.find( SymTab::Mangler::mangle( type ) ) != managedTypes.end() || GenPoly::isPolyType( type ); |
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[65660bd] | 228 | } |
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| 229 | |
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[1ba88a0] | 230 | bool CtorDtor::isManaged( ObjectDecl * objDecl ) const { |
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| 231 | Type * type = objDecl->get_type(); |
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| 232 | while ( ArrayType * at = dynamic_cast< ArrayType * >( type ) ) { |
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| 233 | type = at->get_base(); |
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| 234 | } |
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[65660bd] | 235 | return isManaged( type ); |
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[1ba88a0] | 236 | } |
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| 237 | |
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| 238 | void CtorDtor::handleDWT( DeclarationWithType * dwt ) { |
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| 239 | // if this function is a user-defined constructor or destructor, mark down the type as "managed" |
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| 240 | if ( ! LinkageSpec::isOverridable( dwt->get_linkage() ) && isCtorDtor( dwt->get_name() ) ) { |
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| 241 | std::list< DeclarationWithType * > & params = GenPoly::getFunctionType( dwt->get_type() )->get_parameters(); |
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| 242 | assert( ! params.empty() ); |
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| 243 | PointerType * type = safe_dynamic_cast< PointerType * >( params.front()->get_type() ); |
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| 244 | managedTypes.insert( SymTab::Mangler::mangle( type->get_base() ) ); |
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| 245 | } |
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| 246 | } |
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| 247 | |
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[092528b] | 248 | ImplicitCtorDtorStmt * genCtorDtor( const std::string & fname, ObjectDecl * objDecl, Expression * arg ) { |
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| 249 | // call into genImplicitCall from Autogen.h to generate calls to ctor/dtor |
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| 250 | assertf( objDecl, "genCtorDtor passed null objDecl" ); |
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| 251 | std::list< Statement * > stmts; |
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| 252 | InitExpander srcParam( maybeClone( arg ) ); |
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| 253 | SymTab::genImplicitCall( srcParam, new VariableExpr( objDecl ), fname, back_inserter( stmts ), objDecl ); |
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| 254 | assert( stmts.size() <= 1 ); |
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| 255 | return stmts.size() == 1 ? safe_dynamic_cast< ImplicitCtorDtorStmt * >( stmts.front() ) : nullptr; |
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| 256 | } |
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| 257 | |
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[f0121d7] | 258 | ConstructorInit * genCtorInit( ObjectDecl * objDecl ) { |
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| 259 | // call into genImplicitCall from Autogen.h to generate calls to ctor/dtor |
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| 260 | // for each constructable object |
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| 261 | std::list< Statement * > ctor; |
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| 262 | std::list< Statement * > dtor; |
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| 263 | |
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| 264 | InitExpander srcParam( objDecl->get_init() ); |
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| 265 | InitExpander nullParam( (Initializer *)NULL ); |
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| 266 | SymTab::genImplicitCall( srcParam, new VariableExpr( objDecl ), "?{}", back_inserter( ctor ), objDecl ); |
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| 267 | SymTab::genImplicitCall( nullParam, new VariableExpr( objDecl ), "^?{}", front_inserter( dtor ), objDecl, false ); |
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| 268 | |
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| 269 | // Currently genImplicitCall produces a single Statement - a CompoundStmt |
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| 270 | // which wraps everything that needs to happen. As such, it's technically |
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| 271 | // possible to use a Statement ** in the above calls, but this is inherently |
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| 272 | // unsafe, so instead we take the slightly less efficient route, but will be |
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| 273 | // immediately informed if somehow the above assumption is broken. In this case, |
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| 274 | // we could always wrap the list of statements at this point with a CompoundStmt, |
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| 275 | // but it seems reasonable at the moment for this to be done by genImplicitCall |
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| 276 | // itself. It is possible that genImplicitCall produces no statements (e.g. if |
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| 277 | // an array type does not have a dimension). In this case, it's fine to ignore |
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| 278 | // the object for the purposes of construction. |
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| 279 | assert( ctor.size() == dtor.size() && ctor.size() <= 1 ); |
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| 280 | if ( ctor.size() == 1 ) { |
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| 281 | // need to remember init expression, in case no ctors exist |
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| 282 | // if ctor does exist, want to use ctor expression instead of init |
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| 283 | // push this decision to the resolver |
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| 284 | assert( dynamic_cast< ImplicitCtorDtorStmt * > ( ctor.front() ) && dynamic_cast< ImplicitCtorDtorStmt * > ( dtor.front() ) ); |
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| 285 | return new ConstructorInit( ctor.front(), dtor.front(), objDecl->get_init() ); |
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| 286 | } |
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| 287 | return nullptr; |
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| 288 | } |
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| 289 | |
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[db4ecc5] | 290 | DeclarationWithType * CtorDtor::mutate( ObjectDecl * objDecl ) { |
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[1ba88a0] | 291 | handleDWT( objDecl ); |
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| 292 | // hands off if @=, extern, builtin, etc. |
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| 293 | // if global but initializer is not constexpr, always try to construct, since this is not legal C |
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| 294 | if ( ( tryConstruct( objDecl ) && isManaged( objDecl ) ) || (! inFunction && ! isConstExpr( objDecl->get_init() ) ) ) { |
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| 295 | // constructed objects cannot be designated |
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| 296 | if ( isDesignated( objDecl->get_init() ) ) throw SemanticError( "Cannot include designations in the initializer for a managed Object. If this is really what you want, then initialize with @=.", objDecl ); |
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[dcd73d1] | 297 | // constructed objects should not have initializers nested too deeply |
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| 298 | if ( ! checkInitDepth( objDecl ) ) throw SemanticError( "Managed object's initializer is too deep ", objDecl ); |
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[1ba88a0] | 299 | |
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[f0121d7] | 300 | objDecl->set_init( genCtorInit( objDecl ) ); |
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[974906e2] | 301 | } |
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[1ba88a0] | 302 | return Parent::mutate( objDecl ); |
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[974906e2] | 303 | } |
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| 304 | |
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[02c7d04] | 305 | DeclarationWithType * CtorDtor::mutate( FunctionDecl *functionDecl ) { |
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[1ba88a0] | 306 | ValueGuard< bool > oldInFunc = inFunction; |
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| 307 | inFunction = true; |
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| 308 | |
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| 309 | handleDWT( functionDecl ); |
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| 310 | |
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| 311 | managedTypes.beginScope(); |
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| 312 | // go through assertions and recursively add seen ctor/dtors |
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[8c49c0e] | 313 | for ( auto & tyDecl : functionDecl->get_functionType()->get_forall() ) { |
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[1ba88a0] | 314 | for ( DeclarationWithType *& assertion : tyDecl->get_assertions() ) { |
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| 315 | assertion = assertion->acceptMutator( *this ); |
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| 316 | } |
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| 317 | } |
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[02c7d04] | 318 | // parameters should not be constructed and destructed, so don't mutate FunctionType |
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| 319 | functionDecl->set_statements( maybeMutate( functionDecl->get_statements(), *this ) ); |
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[1ba88a0] | 320 | |
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| 321 | managedTypes.endScope(); |
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[02c7d04] | 322 | return functionDecl; |
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| 323 | } |
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[1ba88a0] | 324 | |
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| 325 | Declaration* CtorDtor::mutate( StructDecl *aggregateDecl ) { |
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| 326 | // don't construct members, but need to take note if there is a managed member, |
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| 327 | // because that means that this type is also managed |
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| 328 | for ( Declaration * member : aggregateDecl->get_members() ) { |
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| 329 | if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( member ) ) { |
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| 330 | if ( isManaged( field ) ) { |
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[23c4aa8] | 331 | StructInstType inst( Type::Qualifiers(), aggregateDecl ); |
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| 332 | managedTypes.insert( SymTab::Mangler::mangle( &inst ) ); |
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[1ba88a0] | 333 | break; |
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| 334 | } |
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| 335 | } |
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| 336 | } |
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| 337 | return aggregateDecl; |
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| 338 | } |
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| 339 | |
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| 340 | CompoundStmt * CtorDtor::mutate( CompoundStmt * compoundStmt ) { |
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| 341 | managedTypes.beginScope(); |
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| 342 | CompoundStmt * stmt = Parent::mutate( compoundStmt ); |
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| 343 | managedTypes.endScope(); |
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| 344 | return stmt; |
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| 345 | } |
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| 346 | |
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[42e2ad7] | 347 | } // namespace InitTweak |
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| 348 | |
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[51587aa] | 349 | // Local Variables: // |
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| 350 | // tab-width: 4 // |
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| 351 | // mode: c++ // |
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| 352 | // compile-command: "make install" // |
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| 353 | // End: // |
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