[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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[8ca3a72] | 15 | #include "GenInit.h" |
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| 16 | |
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[d180746] | 17 | #include <stddef.h> // for NULL |
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| 18 | #include <algorithm> // for any_of |
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[e3e16bc] | 19 | #include <cassert> // for assert, strict_dynamic_cast, assertf |
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[d180746] | 20 | #include <iterator> // for back_inserter, inserter, back_inse... |
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| 21 | #include <list> // for _List_iterator, list |
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[8ca3a72] | 22 | |
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[8135d4c] | 23 | #include "CodeGen/OperatorTable.h" |
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[d180746] | 24 | #include "Common/PassVisitor.h" // for PassVisitor, WithGuards, WithShort... |
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| 25 | #include "Common/SemanticError.h" // for SemanticError |
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| 26 | #include "Common/UniqueName.h" // for UniqueName |
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| 27 | #include "Common/utility.h" // for ValueGuard, maybeClone |
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| 28 | #include "GenPoly/GenPoly.h" // for getFunctionType, isPolyType |
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| 29 | #include "GenPoly/ScopedSet.h" // for ScopedSet, ScopedSet<>::const_iter... |
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| 30 | #include "InitTweak.h" // for isConstExpr, InitExpander, checkIn... |
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| 31 | #include "Parser/LinkageSpec.h" // for isOverridable, C |
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| 32 | #include "SymTab/Autogen.h" // for genImplicitCall, SizeType |
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| 33 | #include "SymTab/Mangler.h" // for Mangler |
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| 34 | #include "SynTree/Declaration.h" // for ObjectDecl, DeclarationWithType |
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| 35 | #include "SynTree/Expression.h" // for VariableExpr, UntypedExpr, Address... |
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| 36 | #include "SynTree/Initializer.h" // for ConstructorInit, SingleInit, Initi... |
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| 37 | #include "SynTree/Label.h" // for Label |
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| 38 | #include "SynTree/Mutator.h" // for mutateAll |
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| 39 | #include "SynTree/Statement.h" // for CompoundStmt, ImplicitCtorDtorStmt |
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| 40 | #include "SynTree/Type.h" // for Type, ArrayType, Type::Qualifiers |
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| 41 | #include "SynTree/Visitor.h" // for acceptAll, maybeAccept |
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[42e2ad7] | 42 | |
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| 43 | namespace InitTweak { |
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[a08ba92] | 44 | namespace { |
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| 45 | const std::list<Label> noLabels; |
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[5b40f30] | 46 | const std::list<Expression *> noDesignators; |
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[a08ba92] | 47 | } |
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[1e9d87b] | 48 | |
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[d24d4e1] | 49 | struct ReturnFixer : public WithStmtsToAdd, public WithGuards { |
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[a0fdbd5] | 50 | /// consistently allocates a temporary variable for the return value |
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| 51 | /// of a function so that anything which the resolver decides can be constructed |
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[02c7d04] | 52 | /// into the return type of a function can be returned. |
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[a0fdbd5] | 53 | static void makeReturnTemp( std::list< Declaration * > &translationUnit ); |
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[02c7d04] | 54 | |
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[7b6ca2e] | 55 | void premutate( FunctionDecl *functionDecl ); |
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| 56 | void premutate( ReturnStmt * returnStmt ); |
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[1e9d87b] | 57 | |
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| 58 | protected: |
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[c6976ba] | 59 | FunctionType * ftype = nullptr; |
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[cf16f94] | 60 | std::string funcName; |
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| 61 | }; |
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[42e2ad7] | 62 | |
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[22bc276] | 63 | struct CtorDtor : public WithGuards, public WithShortCircuiting, public WithVisitorRef<CtorDtor> { |
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[02c7d04] | 64 | /// create constructor and destructor statements for object declarations. |
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[5f98ce5] | 65 | /// the actual call statements will be added in after the resolver has run |
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| 66 | /// so that the initializer expression is only removed if a constructor is found |
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| 67 | /// and the same destructor call is inserted in all of the appropriate locations. |
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[02c7d04] | 68 | static void generateCtorDtor( std::list< Declaration * > &translationUnit ); |
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[974906e2] | 69 | |
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[d24d4e1] | 70 | void previsit( ObjectDecl * ); |
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| 71 | void previsit( FunctionDecl *functionDecl ); |
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| 72 | |
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[5f98ce5] | 73 | // should not traverse into any of these declarations to find objects |
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| 74 | // that need to be constructed or destructed |
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[d24d4e1] | 75 | void previsit( StructDecl *aggregateDecl ); |
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[aec3e6b] | 76 | void previsit( AggregateDecl * ) { visit_children = false; } |
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| 77 | void previsit( NamedTypeDecl * ) { visit_children = false; } |
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[22bc276] | 78 | void previsit( FunctionType * ) { 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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[bfd4974] | 87 | ManagedTypes managedTypes; |
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[1ba88a0] | 88 | bool inFunction = false; |
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[974906e2] | 89 | }; |
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| 90 | |
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[22bc276] | 91 | struct HoistArrayDimension final : public WithDeclsToAdd, public WithShortCircuiting, public WithGuards { |
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[5f98ce5] | 92 | /// hoist dimension from array types in object declaration so that it uses a single |
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| 93 | /// const variable of type size_t, so that side effecting array dimensions are only |
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| 94 | /// computed once. |
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| 95 | static void hoistArrayDimension( std::list< Declaration * > & translationUnit ); |
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| 96 | |
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[22bc276] | 97 | void premutate( ObjectDecl * objectDecl ); |
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| 98 | DeclarationWithType * postmutate( ObjectDecl * objectDecl ); |
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| 99 | void premutate( FunctionDecl *functionDecl ); |
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[5f98ce5] | 100 | // should not traverse into any of these declarations to find objects |
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| 101 | // that need to be constructed or destructed |
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[22bc276] | 102 | void premutate( AggregateDecl * ) { visit_children = false; } |
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| 103 | void premutate( NamedTypeDecl * ) { visit_children = false; } |
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| 104 | void premutate( FunctionType * ) { visit_children = false; } |
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[5f98ce5] | 105 | |
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| 106 | void hoist( Type * type ); |
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| 107 | |
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[68fe077a] | 108 | Type::StorageClasses storageClasses; |
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[40e636a] | 109 | bool inFunction = false; |
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[5f98ce5] | 110 | }; |
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| 111 | |
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[a0fdbd5] | 112 | void genInit( std::list< Declaration * > & translationUnit ) { |
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[8b11840] | 113 | fixReturnStatements( translationUnit ); |
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[5f98ce5] | 114 | HoistArrayDimension::hoistArrayDimension( translationUnit ); |
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[02c7d04] | 115 | CtorDtor::generateCtorDtor( translationUnit ); |
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| 116 | } |
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| 117 | |
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[8b11840] | 118 | void fixReturnStatements( std::list< Declaration * > & translationUnit ) { |
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[7b6ca2e] | 119 | PassVisitor<ReturnFixer> fixer; |
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[a0fdbd5] | 120 | mutateAll( translationUnit, fixer ); |
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[a08ba92] | 121 | } |
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[42e2ad7] | 122 | |
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[7b6ca2e] | 123 | void ReturnFixer::premutate( ReturnStmt *returnStmt ) { |
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[65660bd] | 124 | std::list< DeclarationWithType * > & returnVals = ftype->get_returnVals(); |
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[cf16f94] | 125 | assert( returnVals.size() == 0 || returnVals.size() == 1 ); |
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[c6976ba] | 126 | // hands off if the function returns a reference - we don't want to allocate a temporary if a variable's address |
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[cf16f94] | 127 | // is being returned |
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[bd7e609] | 128 | if ( returnStmt->expr && returnVals.size() == 1 && isConstructable( returnVals.front()->get_type() ) ) { |
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[cce9429] | 129 | // explicitly construct the return value using the return expression and the retVal object |
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[18ca28e] | 130 | assertf( returnVals.front()->name != "", "Function %s has unnamed return value\n", funcName.c_str() ); |
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[c6976ba] | 131 | |
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[bd7e609] | 132 | ObjectDecl * retVal = strict_dynamic_cast< ObjectDecl * >( returnVals.front() ); |
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| 133 | if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( returnStmt->expr ) ) { |
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| 134 | // return statement has already been mutated - don't need to do it again |
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| 135 | if ( varExpr->var == retVal ) return; |
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| 136 | } |
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[9fe33947] | 137 | Statement * stmt = genCtorDtor( "?{}", retVal, returnStmt->expr ); |
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| 138 | assertf( stmt, "ReturnFixer: genCtorDtor returned nullptr: %s / %s", toString( retVal ).c_str(), toString( returnStmt->expr ).c_str() ); |
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| 139 | stmtsToAddBefore.push_back( stmt ); |
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[cf16f94] | 140 | |
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[cce9429] | 141 | // return the retVal object |
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[18ca28e] | 142 | returnStmt->expr = new VariableExpr( returnVals.front() ); |
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[cf16f94] | 143 | } // if |
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| 144 | } |
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| 145 | |
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[7b6ca2e] | 146 | void ReturnFixer::premutate( FunctionDecl *functionDecl ) { |
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[4eb31f2b] | 147 | GuardValue( ftype ); |
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| 148 | GuardValue( funcName ); |
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[1e9d87b] | 149 | |
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[22bc276] | 150 | ftype = functionDecl->type; |
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| 151 | funcName = functionDecl->name; |
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[cf16f94] | 152 | } |
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[974906e2] | 153 | |
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[4d2434a] | 154 | // precompute array dimension expression, because constructor generation may duplicate it, |
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| 155 | // which would be incorrect if it is a side-effecting computation. |
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[5f98ce5] | 156 | void HoistArrayDimension::hoistArrayDimension( std::list< Declaration * > & translationUnit ) { |
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[22bc276] | 157 | PassVisitor<HoistArrayDimension> hoister; |
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| 158 | mutateAll( translationUnit, hoister ); |
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[5f98ce5] | 159 | } |
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| 160 | |
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[22bc276] | 161 | void HoistArrayDimension::premutate( ObjectDecl * objectDecl ) { |
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| 162 | GuardValue( storageClasses ); |
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[a7c90d4] | 163 | storageClasses = objectDecl->get_storageClasses(); |
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[22bc276] | 164 | } |
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| 165 | |
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| 166 | DeclarationWithType * HoistArrayDimension::postmutate( ObjectDecl * objectDecl ) { |
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[5f98ce5] | 167 | hoist( objectDecl->get_type() ); |
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[22bc276] | 168 | return objectDecl; |
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[5f98ce5] | 169 | } |
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| 170 | |
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| 171 | void HoistArrayDimension::hoist( Type * type ) { |
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[40e636a] | 172 | // if in function, generate const size_t var |
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[5f98ce5] | 173 | static UniqueName dimensionName( "_array_dim" ); |
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[40e636a] | 174 | |
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[a7c90d4] | 175 | // C doesn't allow variable sized arrays at global scope or for static variables, so don't hoist dimension. |
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[f9cebb5] | 176 | if ( ! inFunction ) return; |
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[08d5507b] | 177 | if ( storageClasses.is_static ) return; |
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[f9cebb5] | 178 | |
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| 179 | if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) { |
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[5f98ce5] | 180 | if ( ! arrayType->get_dimension() ) return; // xxx - recursive call to hoist? |
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| 181 | |
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[a7c90d4] | 182 | // 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] | 183 | if ( isConstExpr( arrayType->get_dimension() ) ) return; |
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| 184 | |
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[a7c90d4] | 185 | ObjectDecl * arrayDimension = new ObjectDecl( dimensionName.newName(), storageClasses, LinkageSpec::C, 0, SymTab::SizeType->clone(), new SingleInit( arrayType->get_dimension() ) ); |
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[615a096] | 186 | arrayDimension->get_type()->set_const( true ); |
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[5f98ce5] | 187 | |
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| 188 | arrayType->set_dimension( new VariableExpr( arrayDimension ) ); |
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[22bc276] | 189 | declsToAddBefore.push_back( arrayDimension ); |
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[5f98ce5] | 190 | |
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| 191 | hoist( arrayType->get_base() ); |
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| 192 | return; |
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| 193 | } |
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| 194 | } |
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[974906e2] | 195 | |
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[22bc276] | 196 | void HoistArrayDimension::premutate( FunctionDecl * ) { |
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| 197 | GuardValue( inFunction ); |
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[40e636a] | 198 | } |
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| 199 | |
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[02c7d04] | 200 | void CtorDtor::generateCtorDtor( std::list< Declaration * > & translationUnit ) { |
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[d24d4e1] | 201 | PassVisitor<CtorDtor> ctordtor; |
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| 202 | acceptAll( translationUnit, ctordtor ); |
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[974906e2] | 203 | } |
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| 204 | |
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[bfd4974] | 205 | bool ManagedTypes::isManaged( Type * type ) const { |
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[22bc276] | 206 | // references are never constructed |
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[c6976ba] | 207 | if ( dynamic_cast< ReferenceType * >( type ) ) return false; |
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[0b465a5] | 208 | // need to clear and reset qualifiers when determining if a type is managed |
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| 209 | ValueGuard< Type::Qualifiers > qualifiers( type->get_qualifiers() ); |
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| 210 | type->get_qualifiers() = Type::Qualifiers(); |
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[ac9ca96] | 211 | if ( TupleType * tupleType = dynamic_cast< TupleType * > ( type ) ) { |
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| 212 | // tuple is also managed if any of its components are managed |
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[22bc276] | 213 | if ( std::any_of( tupleType->types.begin(), tupleType->types.end(), [&](Type * type) { return isManaged( type ); }) ) { |
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[ac9ca96] | 214 | return true; |
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| 215 | } |
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| 216 | } |
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[30b65d8] | 217 | // 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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[e35f30a] | 218 | return managedTypes.find( SymTab::Mangler::mangleConcrete( type ) ) != managedTypes.end() || GenPoly::isPolyType( type ); |
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[65660bd] | 219 | } |
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| 220 | |
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[bfd4974] | 221 | bool ManagedTypes::isManaged( ObjectDecl * objDecl ) const { |
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[1ba88a0] | 222 | Type * type = objDecl->get_type(); |
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| 223 | while ( ArrayType * at = dynamic_cast< ArrayType * >( type ) ) { |
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| 224 | type = at->get_base(); |
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| 225 | } |
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[65660bd] | 226 | return isManaged( type ); |
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[1ba88a0] | 227 | } |
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| 228 | |
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[bfd4974] | 229 | void ManagedTypes::handleDWT( DeclarationWithType * dwt ) { |
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[1ba88a0] | 230 | // if this function is a user-defined constructor or destructor, mark down the type as "managed" |
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[bff227f] | 231 | if ( ! LinkageSpec::isOverridable( dwt->get_linkage() ) && CodeGen::isCtorDtor( dwt->get_name() ) ) { |
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[1ba88a0] | 232 | std::list< DeclarationWithType * > & params = GenPoly::getFunctionType( dwt->get_type() )->get_parameters(); |
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| 233 | assert( ! params.empty() ); |
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[ce8c12f] | 234 | Type * type = InitTweak::getPointerBase( params.front()->get_type() ); |
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| 235 | assert( type ); |
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[e35f30a] | 236 | managedTypes.insert( SymTab::Mangler::mangleConcrete( type ) ); |
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[1ba88a0] | 237 | } |
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| 238 | } |
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| 239 | |
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[bfd4974] | 240 | void ManagedTypes::handleStruct( StructDecl * aggregateDecl ) { |
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| 241 | // don't construct members, but need to take note if there is a managed member, |
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| 242 | // because that means that this type is also managed |
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| 243 | for ( Declaration * member : aggregateDecl->get_members() ) { |
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| 244 | if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( member ) ) { |
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| 245 | if ( isManaged( field ) ) { |
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[e35f30a] | 246 | // generic parameters should not play a role in determining whether a generic type is constructed - construct all generic types, so that |
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| 247 | // polymorphic constructors make generic types managed types |
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[bfd4974] | 248 | StructInstType inst( Type::Qualifiers(), aggregateDecl ); |
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[e35f30a] | 249 | managedTypes.insert( SymTab::Mangler::mangleConcrete( &inst ) ); |
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[bfd4974] | 250 | break; |
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| 251 | } |
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| 252 | } |
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| 253 | } |
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| 254 | } |
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| 255 | |
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| 256 | void ManagedTypes::beginScope() { managedTypes.beginScope(); } |
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| 257 | void ManagedTypes::endScope() { managedTypes.endScope(); } |
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| 258 | |
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[092528b] | 259 | ImplicitCtorDtorStmt * genCtorDtor( const std::string & fname, ObjectDecl * objDecl, Expression * arg ) { |
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| 260 | // call into genImplicitCall from Autogen.h to generate calls to ctor/dtor |
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| 261 | assertf( objDecl, "genCtorDtor passed null objDecl" ); |
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| 262 | std::list< Statement * > stmts; |
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| 263 | InitExpander srcParam( maybeClone( arg ) ); |
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| 264 | SymTab::genImplicitCall( srcParam, new VariableExpr( objDecl ), fname, back_inserter( stmts ), objDecl ); |
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| 265 | assert( stmts.size() <= 1 ); |
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[e3e16bc] | 266 | return stmts.size() == 1 ? strict_dynamic_cast< ImplicitCtorDtorStmt * >( stmts.front() ) : nullptr; |
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[092528b] | 267 | } |
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| 268 | |
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[f0121d7] | 269 | ConstructorInit * genCtorInit( ObjectDecl * objDecl ) { |
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| 270 | // call into genImplicitCall from Autogen.h to generate calls to ctor/dtor |
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| 271 | // for each constructable object |
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| 272 | std::list< Statement * > ctor; |
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| 273 | std::list< Statement * > dtor; |
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| 274 | |
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| 275 | InitExpander srcParam( objDecl->get_init() ); |
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| 276 | InitExpander nullParam( (Initializer *)NULL ); |
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| 277 | SymTab::genImplicitCall( srcParam, new VariableExpr( objDecl ), "?{}", back_inserter( ctor ), objDecl ); |
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| 278 | SymTab::genImplicitCall( nullParam, new VariableExpr( objDecl ), "^?{}", front_inserter( dtor ), objDecl, false ); |
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| 279 | |
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| 280 | // Currently genImplicitCall produces a single Statement - a CompoundStmt |
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| 281 | // which wraps everything that needs to happen. As such, it's technically |
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| 282 | // possible to use a Statement ** in the above calls, but this is inherently |
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| 283 | // unsafe, so instead we take the slightly less efficient route, but will be |
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| 284 | // immediately informed if somehow the above assumption is broken. In this case, |
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| 285 | // we could always wrap the list of statements at this point with a CompoundStmt, |
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| 286 | // but it seems reasonable at the moment for this to be done by genImplicitCall |
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| 287 | // itself. It is possible that genImplicitCall produces no statements (e.g. if |
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| 288 | // an array type does not have a dimension). In this case, it's fine to ignore |
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| 289 | // the object for the purposes of construction. |
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| 290 | assert( ctor.size() == dtor.size() && ctor.size() <= 1 ); |
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| 291 | if ( ctor.size() == 1 ) { |
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| 292 | // need to remember init expression, in case no ctors exist |
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| 293 | // if ctor does exist, want to use ctor expression instead of init |
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| 294 | // push this decision to the resolver |
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| 295 | assert( dynamic_cast< ImplicitCtorDtorStmt * > ( ctor.front() ) && dynamic_cast< ImplicitCtorDtorStmt * > ( dtor.front() ) ); |
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| 296 | return new ConstructorInit( ctor.front(), dtor.front(), objDecl->get_init() ); |
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| 297 | } |
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| 298 | return nullptr; |
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| 299 | } |
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| 300 | |
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[d24d4e1] | 301 | void CtorDtor::previsit( ObjectDecl * objDecl ) { |
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[bfd4974] | 302 | managedTypes.handleDWT( objDecl ); |
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[1ba88a0] | 303 | // hands off if @=, extern, builtin, etc. |
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[a4dd728] | 304 | // even if unmanaged, try to construct global or static if initializer is not constexpr, since this is not legal C |
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[bfd4974] | 305 | if ( tryConstruct( objDecl ) && ( managedTypes.isManaged( objDecl ) || ((! inFunction || objDecl->get_storageClasses().is_static ) && ! isConstExpr( objDecl->get_init() ) ) ) ) { |
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[1ba88a0] | 306 | // constructed objects cannot be designated |
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[a4dd728] | 307 | 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] | 308 | // constructed objects should not have initializers nested too deeply |
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| 309 | if ( ! checkInitDepth( objDecl ) ) throw SemanticError( "Managed object's initializer is too deep ", objDecl ); |
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[1ba88a0] | 310 | |
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[f0121d7] | 311 | objDecl->set_init( genCtorInit( objDecl ) ); |
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[974906e2] | 312 | } |
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| 313 | } |
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| 314 | |
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[d24d4e1] | 315 | void CtorDtor::previsit( FunctionDecl *functionDecl ) { |
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[22bc276] | 316 | visit_children = false; // do not try and construct parameters or forall parameters |
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[d24d4e1] | 317 | GuardValue( inFunction ); |
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[1ba88a0] | 318 | inFunction = true; |
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| 319 | |
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[bfd4974] | 320 | managedTypes.handleDWT( functionDecl ); |
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[1ba88a0] | 321 | |
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[d24d4e1] | 322 | GuardScope( managedTypes ); |
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[1ba88a0] | 323 | // go through assertions and recursively add seen ctor/dtors |
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[8c49c0e] | 324 | for ( auto & tyDecl : functionDecl->get_functionType()->get_forall() ) { |
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[1ba88a0] | 325 | for ( DeclarationWithType *& assertion : tyDecl->get_assertions() ) { |
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[bfd4974] | 326 | managedTypes.handleDWT( assertion ); |
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[1ba88a0] | 327 | } |
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| 328 | } |
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| 329 | |
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[22bc276] | 330 | maybeAccept( functionDecl->get_statements(), *visitor ); |
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[02c7d04] | 331 | } |
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[1ba88a0] | 332 | |
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[d24d4e1] | 333 | void CtorDtor::previsit( StructDecl *aggregateDecl ) { |
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| 334 | visit_children = false; // do not try to construct and destruct aggregate members |
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| 335 | |
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[bfd4974] | 336 | managedTypes.handleStruct( aggregateDecl ); |
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[1ba88a0] | 337 | } |
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| 338 | |
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[22bc276] | 339 | void CtorDtor::previsit( CompoundStmt * ) { |
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[d24d4e1] | 340 | GuardScope( managedTypes ); |
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[1ba88a0] | 341 | } |
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[42e2ad7] | 342 | } // namespace InitTweak |
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| 343 | |
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[51587aa] | 344 | // Local Variables: // |
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| 345 | // tab-width: 4 // |
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| 346 | // mode: c++ // |
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| 347 | // compile-command: "make install" // |
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| 348 | // End: // |
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