[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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[615a096] | 12 | // Last Modified On : Fri Mar 17 09:12:36 2017 |
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| 13 | // Update Count : 183 |
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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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[8ca3a72] | 18 | |
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[7b3f66b] | 19 | #include "InitTweak.h" |
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[8ca3a72] | 20 | #include "GenInit.h" |
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| 21 | |
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| 22 | #include "Common/PassVisitor.h" |
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| 23 | |
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| 24 | #include "GenPoly/DeclMutator.h" |
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| 25 | #include "GenPoly/PolyMutator.h" |
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| 26 | #include "GenPoly/ScopedSet.h" |
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| 27 | |
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| 28 | #include "ResolvExpr/typeops.h" |
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| 29 | |
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[42e2ad7] | 30 | #include "SynTree/Declaration.h" |
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| 31 | #include "SynTree/Expression.h" |
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| 32 | #include "SynTree/Initializer.h" |
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| 33 | #include "SynTree/Mutator.h" |
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[8ca3a72] | 34 | #include "SynTree/Statement.h" |
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| 35 | #include "SynTree/Type.h" |
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| 36 | |
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[620cb95] | 37 | #include "SymTab/Autogen.h" |
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[1ba88a0] | 38 | #include "SymTab/Mangler.h" |
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[42e2ad7] | 39 | |
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| 40 | namespace InitTweak { |
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[a08ba92] | 41 | namespace { |
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| 42 | const std::list<Label> noLabels; |
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[5b40f30] | 43 | const std::list<Expression *> noDesignators; |
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[a08ba92] | 44 | } |
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[1e9d87b] | 45 | |
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[d24d4e1] | 46 | struct ReturnFixer : public WithStmtsToAdd, public WithGuards { |
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[a0fdbd5] | 47 | /// consistently allocates a temporary variable for the return value |
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| 48 | /// of a function so that anything which the resolver decides can be constructed |
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[02c7d04] | 49 | /// into the return type of a function can be returned. |
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[a0fdbd5] | 50 | static void makeReturnTemp( std::list< Declaration * > &translationUnit ); |
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[02c7d04] | 51 | |
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[7b6ca2e] | 52 | void premutate( FunctionDecl *functionDecl ); |
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| 53 | void premutate( ReturnStmt * returnStmt ); |
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[1e9d87b] | 54 | |
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| 55 | protected: |
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[65660bd] | 56 | FunctionType * ftype; |
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[cf16f94] | 57 | std::string funcName; |
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| 58 | }; |
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[42e2ad7] | 59 | |
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[d24d4e1] | 60 | struct CtorDtor : public WithGuards, public WithShortCircuiting { |
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[02c7d04] | 61 | /// create constructor and destructor statements for object declarations. |
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[5f98ce5] | 62 | /// the actual call statements will be added in after the resolver has run |
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| 63 | /// so that the initializer expression is only removed if a constructor is found |
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| 64 | /// and the same destructor call is inserted in all of the appropriate locations. |
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[02c7d04] | 65 | static void generateCtorDtor( std::list< Declaration * > &translationUnit ); |
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[974906e2] | 66 | |
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[d24d4e1] | 67 | void previsit( ObjectDecl * ); |
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| 68 | void previsit( FunctionDecl *functionDecl ); |
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| 69 | |
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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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[d24d4e1] | 72 | void previsit( StructDecl *aggregateDecl ); |
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[9ff56e7] | 73 | void previsit( __attribute__((unused)) UnionDecl * aggregateDecl ) { visit_children = false; } |
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| 74 | void previsit( __attribute__((unused)) EnumDecl * aggregateDecl ) { visit_children = false; } |
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| 75 | void previsit( __attribute__((unused)) TraitDecl * aggregateDecl ) { visit_children = false; } |
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| 76 | void previsit( __attribute__((unused)) TypeDecl * typeDecl ) { visit_children = false; } |
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| 77 | void previsit( __attribute__((unused)) TypedefDecl * typeDecl ) { visit_children = false; } |
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| 78 | void previsit( __attribute__((unused)) FunctionType * funcType ) { visit_children = false; } |
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[db4ecc5] | 79 | |
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[d24d4e1] | 80 | void previsit( CompoundStmt * compoundStmt ); |
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[1ba88a0] | 81 | |
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| 82 | private: |
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| 83 | // set of mangled type names for which a constructor or destructor exists in the current scope. |
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| 84 | // these types require a ConstructorInit node to be generated, anything else is a POD type and thus |
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| 85 | // should not have a ConstructorInit generated. |
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| 86 | |
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| 87 | bool isManaged( ObjectDecl * objDecl ) const ; // determine if object is managed |
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[65660bd] | 88 | bool isManaged( Type * type ) const; // determine if type is managed |
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[1ba88a0] | 89 | void handleDWT( DeclarationWithType * dwt ); // add type to managed if ctor/dtor |
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| 90 | GenPoly::ScopedSet< std::string > managedTypes; |
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| 91 | bool inFunction = false; |
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[974906e2] | 92 | }; |
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| 93 | |
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[62e5546] | 94 | class HoistArrayDimension final : public GenPoly::DeclMutator { |
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[5f98ce5] | 95 | public: |
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| 96 | typedef GenPoly::DeclMutator Parent; |
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| 97 | |
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| 98 | /// hoist dimension from array types in object declaration so that it uses a single |
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| 99 | /// const variable of type size_t, so that side effecting array dimensions are only |
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| 100 | /// computed once. |
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| 101 | static void hoistArrayDimension( std::list< Declaration * > & translationUnit ); |
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| 102 | |
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| 103 | private: |
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[62e5546] | 104 | using Parent::mutate; |
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| 105 | |
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| 106 | virtual DeclarationWithType * mutate( ObjectDecl * objectDecl ) override; |
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| 107 | virtual DeclarationWithType * mutate( FunctionDecl *functionDecl ) override; |
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[5f98ce5] | 108 | // should not traverse into any of these declarations to find objects |
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| 109 | // that need to be constructed or destructed |
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[62e5546] | 110 | virtual Declaration* mutate( StructDecl *aggregateDecl ) override { return aggregateDecl; } |
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| 111 | virtual Declaration* mutate( UnionDecl *aggregateDecl ) override { return aggregateDecl; } |
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| 112 | virtual Declaration* mutate( EnumDecl *aggregateDecl ) override { return aggregateDecl; } |
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| 113 | virtual Declaration* mutate( TraitDecl *aggregateDecl ) override { return aggregateDecl; } |
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| 114 | virtual TypeDecl* mutate( TypeDecl *typeDecl ) override { return typeDecl; } |
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| 115 | virtual Declaration* mutate( TypedefDecl *typeDecl ) override { return typeDecl; } |
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| 116 | |
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| 117 | virtual Type* mutate( FunctionType *funcType ) override { return funcType; } |
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[5f98ce5] | 118 | |
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| 119 | void hoist( Type * type ); |
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| 120 | |
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[68fe077a] | 121 | Type::StorageClasses storageClasses; |
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[40e636a] | 122 | bool inFunction = false; |
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[5f98ce5] | 123 | }; |
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| 124 | |
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[a0fdbd5] | 125 | void genInit( std::list< Declaration * > & translationUnit ) { |
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| 126 | ReturnFixer::makeReturnTemp( translationUnit ); |
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[5f98ce5] | 127 | HoistArrayDimension::hoistArrayDimension( translationUnit ); |
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[02c7d04] | 128 | CtorDtor::generateCtorDtor( translationUnit ); |
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| 129 | } |
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| 130 | |
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[a0fdbd5] | 131 | void ReturnFixer::makeReturnTemp( std::list< Declaration * > & translationUnit ) { |
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[7b6ca2e] | 132 | PassVisitor<ReturnFixer> fixer; |
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[a0fdbd5] | 133 | mutateAll( translationUnit, fixer ); |
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[a08ba92] | 134 | } |
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[42e2ad7] | 135 | |
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[7b6ca2e] | 136 | void ReturnFixer::premutate( ReturnStmt *returnStmt ) { |
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[65660bd] | 137 | std::list< DeclarationWithType * > & returnVals = ftype->get_returnVals(); |
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[cf16f94] | 138 | assert( returnVals.size() == 0 || returnVals.size() == 1 ); |
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| 139 | // 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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| 140 | // is being returned |
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[a28bc02] | 141 | if ( returnStmt->get_expr() && returnVals.size() == 1 && ! returnVals.front()->get_type()->get_lvalue() ) { |
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[cce9429] | 142 | // explicitly construct the return value using the return expression and the retVal object |
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| 143 | assertf( returnVals.front()->get_name() != "", "Function %s has unnamed return value\n", funcName.c_str() ); |
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[5b40f30] | 144 | UntypedExpr *construct = new UntypedExpr( new NameExpr( "?{}" ) ); |
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[cce9429] | 145 | construct->get_args().push_back( new AddressExpr( new VariableExpr( returnVals.front() ) ) ); |
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[5b40f30] | 146 | construct->get_args().push_back( returnStmt->get_expr() ); |
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[7b6ca2e] | 147 | stmtsToAddBefore.push_back(new ExprStmt(noLabels, construct)); |
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[cf16f94] | 148 | |
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[cce9429] | 149 | // return the retVal object |
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| 150 | returnStmt->set_expr( new VariableExpr( returnVals.front() ) ); |
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[cf16f94] | 151 | } // if |
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| 152 | } |
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| 153 | |
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[7b6ca2e] | 154 | void ReturnFixer::premutate( FunctionDecl *functionDecl ) { |
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[4eb31f2b] | 155 | GuardValue( ftype ); |
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| 156 | GuardValue( funcName ); |
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[1e9d87b] | 157 | |
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[65660bd] | 158 | ftype = functionDecl->get_functionType(); |
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[cf16f94] | 159 | funcName = functionDecl->get_name(); |
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| 160 | } |
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[974906e2] | 161 | |
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[4d2434a] | 162 | // precompute array dimension expression, because constructor generation may duplicate it, |
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| 163 | // which would be incorrect if it is a side-effecting computation. |
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[5f98ce5] | 164 | void HoistArrayDimension::hoistArrayDimension( std::list< Declaration * > & translationUnit ) { |
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| 165 | HoistArrayDimension hoister; |
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[40e636a] | 166 | hoister.mutateDeclarationList( translationUnit ); |
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[5f98ce5] | 167 | } |
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| 168 | |
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| 169 | DeclarationWithType * HoistArrayDimension::mutate( ObjectDecl * objectDecl ) { |
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[a7c90d4] | 170 | storageClasses = objectDecl->get_storageClasses(); |
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[5f98ce5] | 171 | DeclarationWithType * temp = Parent::mutate( objectDecl ); |
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| 172 | hoist( objectDecl->get_type() ); |
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| 173 | return temp; |
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| 174 | } |
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| 175 | |
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| 176 | void HoistArrayDimension::hoist( Type * type ) { |
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[40e636a] | 177 | // if in function, generate const size_t var |
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[5f98ce5] | 178 | static UniqueName dimensionName( "_array_dim" ); |
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[40e636a] | 179 | |
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[a7c90d4] | 180 | // C doesn't allow variable sized arrays at global scope or for static variables, so don't hoist dimension. |
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[f9cebb5] | 181 | if ( ! inFunction ) return; |
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[08d5507b] | 182 | if ( storageClasses.is_static ) return; |
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[f9cebb5] | 183 | |
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| 184 | if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) { |
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[5f98ce5] | 185 | if ( ! arrayType->get_dimension() ) return; // xxx - recursive call to hoist? |
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| 186 | |
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[a7c90d4] | 187 | // 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] | 188 | if ( isConstExpr( arrayType->get_dimension() ) ) return; |
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| 189 | |
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[a7c90d4] | 190 | ObjectDecl * arrayDimension = new ObjectDecl( dimensionName.newName(), storageClasses, LinkageSpec::C, 0, SymTab::SizeType->clone(), new SingleInit( arrayType->get_dimension() ) ); |
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[615a096] | 191 | arrayDimension->get_type()->set_const( true ); |
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[5f98ce5] | 192 | |
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| 193 | arrayType->set_dimension( new VariableExpr( arrayDimension ) ); |
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| 194 | addDeclaration( arrayDimension ); |
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| 195 | |
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| 196 | hoist( arrayType->get_base() ); |
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| 197 | return; |
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| 198 | } |
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| 199 | } |
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[974906e2] | 200 | |
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[40e636a] | 201 | DeclarationWithType * HoistArrayDimension::mutate( FunctionDecl *functionDecl ) { |
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[1ba88a0] | 202 | ValueGuard< bool > oldInFunc( inFunction ); |
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[40e636a] | 203 | inFunction = true; |
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| 204 | DeclarationWithType * decl = Parent::mutate( functionDecl ); |
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| 205 | return decl; |
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| 206 | } |
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| 207 | |
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[02c7d04] | 208 | void CtorDtor::generateCtorDtor( std::list< Declaration * > & translationUnit ) { |
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[d24d4e1] | 209 | PassVisitor<CtorDtor> ctordtor; |
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| 210 | acceptAll( translationUnit, ctordtor ); |
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[974906e2] | 211 | } |
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| 212 | |
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[65660bd] | 213 | bool CtorDtor::isManaged( Type * type ) const { |
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[0b465a5] | 214 | // need to clear and reset qualifiers when determining if a type is managed |
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| 215 | ValueGuard< Type::Qualifiers > qualifiers( type->get_qualifiers() ); |
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| 216 | type->get_qualifiers() = Type::Qualifiers(); |
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[ac9ca96] | 217 | if ( TupleType * tupleType = dynamic_cast< TupleType * > ( type ) ) { |
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| 218 | // tuple is also managed if any of its components are managed |
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| 219 | if ( std::any_of( tupleType->get_types().begin(), tupleType->get_types().end(), [&](Type * type) { return isManaged( type ); }) ) { |
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| 220 | return true; |
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| 221 | } |
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| 222 | } |
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[30b65d8] | 223 | // 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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| 224 | return managedTypes.find( SymTab::Mangler::mangle( type ) ) != managedTypes.end() || GenPoly::isPolyType( type ); |
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[65660bd] | 225 | } |
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| 226 | |
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[1ba88a0] | 227 | bool CtorDtor::isManaged( ObjectDecl * objDecl ) const { |
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| 228 | Type * type = objDecl->get_type(); |
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| 229 | while ( ArrayType * at = dynamic_cast< ArrayType * >( type ) ) { |
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| 230 | type = at->get_base(); |
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| 231 | } |
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[65660bd] | 232 | return isManaged( type ); |
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[1ba88a0] | 233 | } |
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| 234 | |
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| 235 | void CtorDtor::handleDWT( DeclarationWithType * dwt ) { |
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| 236 | // if this function is a user-defined constructor or destructor, mark down the type as "managed" |
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| 237 | if ( ! LinkageSpec::isOverridable( dwt->get_linkage() ) && isCtorDtor( dwt->get_name() ) ) { |
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| 238 | std::list< DeclarationWithType * > & params = GenPoly::getFunctionType( dwt->get_type() )->get_parameters(); |
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| 239 | assert( ! params.empty() ); |
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| 240 | PointerType * type = safe_dynamic_cast< PointerType * >( params.front()->get_type() ); |
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| 241 | managedTypes.insert( SymTab::Mangler::mangle( type->get_base() ) ); |
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| 242 | } |
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| 243 | } |
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| 244 | |
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[092528b] | 245 | ImplicitCtorDtorStmt * genCtorDtor( const std::string & fname, ObjectDecl * objDecl, Expression * arg ) { |
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| 246 | // call into genImplicitCall from Autogen.h to generate calls to ctor/dtor |
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| 247 | assertf( objDecl, "genCtorDtor passed null objDecl" ); |
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| 248 | std::list< Statement * > stmts; |
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| 249 | InitExpander srcParam( maybeClone( arg ) ); |
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| 250 | SymTab::genImplicitCall( srcParam, new VariableExpr( objDecl ), fname, back_inserter( stmts ), objDecl ); |
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| 251 | assert( stmts.size() <= 1 ); |
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| 252 | return stmts.size() == 1 ? safe_dynamic_cast< ImplicitCtorDtorStmt * >( stmts.front() ) : nullptr; |
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| 253 | } |
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| 254 | |
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[f0121d7] | 255 | ConstructorInit * genCtorInit( ObjectDecl * objDecl ) { |
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| 256 | // call into genImplicitCall from Autogen.h to generate calls to ctor/dtor |
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| 257 | // for each constructable object |
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| 258 | std::list< Statement * > ctor; |
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| 259 | std::list< Statement * > dtor; |
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| 260 | |
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| 261 | InitExpander srcParam( objDecl->get_init() ); |
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| 262 | InitExpander nullParam( (Initializer *)NULL ); |
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| 263 | SymTab::genImplicitCall( srcParam, new VariableExpr( objDecl ), "?{}", back_inserter( ctor ), objDecl ); |
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| 264 | SymTab::genImplicitCall( nullParam, new VariableExpr( objDecl ), "^?{}", front_inserter( dtor ), objDecl, false ); |
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| 265 | |
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| 266 | // Currently genImplicitCall produces a single Statement - a CompoundStmt |
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| 267 | // which wraps everything that needs to happen. As such, it's technically |
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| 268 | // possible to use a Statement ** in the above calls, but this is inherently |
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| 269 | // unsafe, so instead we take the slightly less efficient route, but will be |
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| 270 | // immediately informed if somehow the above assumption is broken. In this case, |
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| 271 | // we could always wrap the list of statements at this point with a CompoundStmt, |
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| 272 | // but it seems reasonable at the moment for this to be done by genImplicitCall |
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| 273 | // itself. It is possible that genImplicitCall produces no statements (e.g. if |
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| 274 | // an array type does not have a dimension). In this case, it's fine to ignore |
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| 275 | // the object for the purposes of construction. |
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| 276 | assert( ctor.size() == dtor.size() && ctor.size() <= 1 ); |
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| 277 | if ( ctor.size() == 1 ) { |
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| 278 | // need to remember init expression, in case no ctors exist |
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| 279 | // if ctor does exist, want to use ctor expression instead of init |
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| 280 | // push this decision to the resolver |
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| 281 | assert( dynamic_cast< ImplicitCtorDtorStmt * > ( ctor.front() ) && dynamic_cast< ImplicitCtorDtorStmt * > ( dtor.front() ) ); |
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| 282 | return new ConstructorInit( ctor.front(), dtor.front(), objDecl->get_init() ); |
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| 283 | } |
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| 284 | return nullptr; |
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| 285 | } |
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| 286 | |
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[d24d4e1] | 287 | void CtorDtor::previsit( ObjectDecl * objDecl ) { |
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[1ba88a0] | 288 | handleDWT( objDecl ); |
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| 289 | // hands off if @=, extern, builtin, etc. |
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[a4dd728] | 290 | // even if unmanaged, try to construct global or static if initializer is not constexpr, since this is not legal C |
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| 291 | if ( tryConstruct( objDecl ) && ( isManaged( objDecl ) || ((! inFunction || objDecl->get_storageClasses().is_static ) && ! isConstExpr( objDecl->get_init() ) ) ) ) { |
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[1ba88a0] | 292 | // constructed objects cannot be designated |
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[a4dd728] | 293 | 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 @=.\n", objDecl ); |
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[dcd73d1] | 294 | // constructed objects should not have initializers nested too deeply |
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| 295 | if ( ! checkInitDepth( objDecl ) ) throw SemanticError( "Managed object's initializer is too deep ", objDecl ); |
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[1ba88a0] | 296 | |
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[f0121d7] | 297 | objDecl->set_init( genCtorInit( objDecl ) ); |
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[974906e2] | 298 | } |
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| 299 | } |
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| 300 | |
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[d24d4e1] | 301 | void CtorDtor::previsit( FunctionDecl *functionDecl ) { |
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| 302 | GuardValue( inFunction ); |
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[1ba88a0] | 303 | inFunction = true; |
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| 304 | |
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| 305 | handleDWT( functionDecl ); |
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| 306 | |
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[d24d4e1] | 307 | GuardScope( managedTypes ); |
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[1ba88a0] | 308 | // go through assertions and recursively add seen ctor/dtors |
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[8c49c0e] | 309 | for ( auto & tyDecl : functionDecl->get_functionType()->get_forall() ) { |
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[1ba88a0] | 310 | for ( DeclarationWithType *& assertion : tyDecl->get_assertions() ) { |
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[a8e64c4] | 311 | handleDWT( assertion ); |
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[1ba88a0] | 312 | } |
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| 313 | } |
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| 314 | |
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[d24d4e1] | 315 | PassVisitor<CtorDtor> newCtorDtor; |
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| 316 | newCtorDtor.pass = *this; |
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| 317 | maybeAccept( functionDecl->get_statements(), newCtorDtor ); |
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| 318 | visit_children = false; // do not try and construct parameters or forall parameters - must happen after maybeAccept |
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[02c7d04] | 319 | } |
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[1ba88a0] | 320 | |
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[d24d4e1] | 321 | void CtorDtor::previsit( StructDecl *aggregateDecl ) { |
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| 322 | visit_children = false; // do not try to construct and destruct aggregate members |
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| 323 | |
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[1ba88a0] | 324 | // don't construct members, but need to take note if there is a managed member, |
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| 325 | // because that means that this type is also managed |
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| 326 | for ( Declaration * member : aggregateDecl->get_members() ) { |
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| 327 | if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( member ) ) { |
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| 328 | if ( isManaged( field ) ) { |
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[23c4aa8] | 329 | StructInstType inst( Type::Qualifiers(), aggregateDecl ); |
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| 330 | managedTypes.insert( SymTab::Mangler::mangle( &inst ) ); |
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[1ba88a0] | 331 | break; |
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| 332 | } |
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| 333 | } |
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| 334 | } |
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| 335 | } |
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| 336 | |
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[9ff56e7] | 337 | void CtorDtor::previsit( __attribute__((unused)) CompoundStmt * compoundStmt ) { |
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[d24d4e1] | 338 | GuardScope( managedTypes ); |
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[1ba88a0] | 339 | } |
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[42e2ad7] | 340 | } // namespace InitTweak |
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| 341 | |
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[51587aa] | 342 | // Local Variables: // |
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| 343 | // tab-width: 4 // |
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| 344 | // mode: c++ // |
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| 345 | // compile-command: "make install" // |
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| 346 | // End: // |
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