[ba912706] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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| 7 | // ExceptVisitor.cc -- |
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| 8 | // |
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| 9 | // Author : Andrew Beach |
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| 10 | // Created On : Wed Jun 14 16:49:00 2017 |
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| 11 | // Last Modified By : Andrew Beach |
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| 12 | // Last Modified On : Thr Jun 22 15:57:00 2017 |
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| 13 | // Update Count : 0 |
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| 14 | // |
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| 15 | |
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| 16 | #include "ExceptTranslate.h" |
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| 17 | #include "Common/PassVisitor.h" |
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| 18 | |
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| 19 | namespace ControlFlow { |
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| 20 | |
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| 21 | // This (large) section could probably be moved out of the class |
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| 22 | // and be static helpers instead. |
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| 23 | |
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| 24 | // Type(Qualifiers &, false, std::list<Attribute *> &) |
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| 25 | |
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| 26 | // void (*function)() |
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| 27 | static FunctionType void_func_t(Type::Qualifiers(), false); |
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| 28 | // void (*function)(int, exception); |
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| 29 | static FunctionType catch_func_t(Type::Qualifiers(), false); |
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| 30 | // int (*function)(exception); |
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| 31 | static FunctionType match_func_t(Type::Qualifiers(), false); |
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| 32 | // bool (*function)(exception); |
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| 33 | static FunctionType handle_func_t(Type::Qualifiers(), false); |
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| 34 | |
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| 35 | static void init_func_types() { |
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| 36 | static init_complete = false; |
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| 37 | if (init_complete) { |
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| 38 | return; |
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| 39 | } |
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| 40 | ObjectDecl index_obj( |
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| 41 | "index_t", |
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| 42 | Type::StorageClasses(), |
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| 43 | LinkageSpec::Cforall, |
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| 44 | /*bitfieldWidth*/ NULL, |
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| 45 | new BasicType(emptyQualifiers, BasicType::UnsignedInt), |
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| 46 | /*init*/ NULL |
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| 47 | ); |
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| 48 | ObjectDecl exception_obj( |
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| 49 | "exception_t", |
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| 50 | Type::StorageClasses(), |
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| 51 | LinkageSpec::Cforall, |
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| 52 | /*bitfieldWidth*/ NULL, |
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| 53 | new BasicType(emptyQualifiers, BasicType::UnsignedInt), |
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| 54 | /*init*/ NULL |
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| 55 | ); |
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| 56 | ObjectDecl bool_obj( |
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| 57 | "bool_t", |
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| 58 | Type::StorageClasses(), |
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| 59 | LinkageSpec::Cforall, |
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| 60 | /*bitfieldWidth*/ NULL, |
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| 61 | new BasicType(emptyQualifiers, BasicType::Bool), |
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| 62 | /*init*/ NULL |
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| 63 | ); |
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| 64 | |
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| 65 | catch_func_t.get_parameters().push_back(index_obj.clone()); |
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| 66 | catch_func_t.get_parameters().push_back(exception_obj.clone()); |
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| 67 | match_func_t.get_returnVals().push_back(index_obj.clone()); |
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| 68 | match_func_t.get_parameters().push_back(exception_obj.clone()); |
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| 69 | handle_func_t.get_returnVals().push_back(bool_obj.clone()); |
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| 70 | handle_func_t.get_parameters().push_back(exception_obj.clone()); |
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| 71 | |
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| 72 | init_complete = true; |
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| 73 | } |
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| 74 | |
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| 75 | // Buricratic Helpers (Not having to do with the paritular operation.) |
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| 76 | |
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| 77 | typedef std::list<CatchStmt*> CatchList; |
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| 78 | |
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| 79 | void split( CatchList& allHandlers, CatchList& terHandlers, |
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| 80 | CatchList& resHandlers ) { |
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| 81 | while ( !allHandlers.empty() ) { |
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| 82 | Statement * stmt = allHandlers.front(); |
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| 83 | allHandlers.pop_front(); |
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| 84 | if (CaseStmt::Terminate == stmt->get_kind()) { |
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| 85 | terHandlers.push_back(stmt); |
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| 86 | } else { |
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| 87 | resHandlers.push_back(stmt); |
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| 88 | } |
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| 89 | } |
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| 90 | } |
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| 91 | |
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| 92 | template<typename T> |
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| 93 | void free_all( std::list<T *> &list ) { |
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| 94 | std::list<T *>::iterator it; |
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| 95 | for ( it = list.begin() ; it != list.end() ; ++it ) { |
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| 96 | delete *it; |
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| 97 | } |
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| 98 | list.clear(); |
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| 99 | } |
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| 100 | |
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| 101 | void appendDeclStmt( CompoundStmt * block, Declaration * item ) { |
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| 102 | block->push_back(new DeclStmt(no_labels, item)); |
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| 103 | } |
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| 104 | |
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| 105 | Expression * nameOf( FunctionDecl * function ) { |
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| 106 | return new VariableExpr( function ); |
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| 107 | } |
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| 108 | |
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| 109 | // ThrowStmt Mutation Helpers |
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| 110 | |
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| 111 | Statement * create_terminate_throw( ThrowStmt *throwStmt ) { |
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| 112 | // __throw_terminate( EXPR ); |
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| 113 | ApplicationExpr * call = new ApplicationExpr( /* ... */ ); |
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| 114 | call->get_args.push_back( throwStmt->get_expr() ); |
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| 115 | Statement * result = new ExprStmt( throwStmt->get_labels(), call ); |
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| 116 | throwStmt->set_expr( nullptr ); |
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| 117 | delete throwStmt; |
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| 118 | return result; |
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| 119 | } |
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| 120 | Statement * create_terminate_rethrow( ThrowStmt *throwStmt ) { |
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| 121 | // __rethrow_terminate(); |
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| 122 | Statement * result = new ExprStmt( |
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| 123 | throwStmt->get_labels(), |
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| 124 | new ApplicationExpr( /* ... */ ); |
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| 125 | ); |
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| 126 | delete throwStmt; |
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| 127 | return result; |
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| 128 | } |
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| 129 | Statement * create_resume_throw( ThrowStmt *throwStmt ) { |
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| 130 | // __throw_resume( EXPR ); |
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| 131 | ApplicationExpr * call = new ApplicationExpr( /* ... */ ); |
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| 132 | call->get_args.push_back( throwStmt->get_expr() ); |
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| 133 | Statement * result = new ExprStmt( throwStmt->get_labels(), call ); |
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| 134 | throwStmt->set_expr( nullptr ); |
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| 135 | delete throwStmt; |
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| 136 | return result; |
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| 137 | } |
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| 138 | Statement * create_resume_rethrow( ThrowStmt *throwStmt ) { |
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| 139 | // return false; |
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| 140 | Statement * result = new ReturnStmt( |
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| 141 | throwStmt->get_labels(), |
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| 142 | new ConstantExpr( |
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| 143 | Constant( |
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| 144 | new BasicType( |
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| 145 | Type::Qualifiers(), |
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| 146 | BasicType::Bool |
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| 147 | ), |
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| 148 | "0") |
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| 149 | ) |
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| 150 | ); |
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| 151 | delete throwStmt; |
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| 152 | return result; |
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| 153 | } |
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| 154 | |
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| 155 | // TryStmt Mutation Helpers |
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| 156 | |
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| 157 | CompoundStmt * take_try_block( TryStmt *tryStmt ) { |
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| 158 | CompoundStmt * block = tryStmt->get_block(); |
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| 159 | tryStmt->set_block( nullptr ); |
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| 160 | return block; |
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| 161 | } |
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| 162 | FunctionDecl * create_try_wrapper( TryStmt *tryStmt ) { |
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| 163 | CompoundStmt * body = base_try->get_block(); |
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| 164 | base_try->set_block(nullptr); |
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| 165 | |
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| 166 | return new FunctionDecl("try", Type::StorageClasses(), |
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| 167 | LinkageSpec::Cforall, void_func_t, body); |
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| 168 | } |
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| 169 | |
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| 170 | FunctionDecl * create_terminate_catch( CatchList &handlers ) { |
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| 171 | std::list<CaseStmt *> handler_wrappers; |
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| 172 | |
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| 173 | // Index 1..{number of handlers} |
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| 174 | int index = 0; |
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| 175 | CatchList::iterator it = handlers.begin(); |
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| 176 | for ( ; it != handlers.end() ; ++it ) { |
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| 177 | ++index; |
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| 178 | CatchStmt * handler = *it; |
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| 179 | |
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| 180 | std::list<Statement *> core; |
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| 181 | if ( /*the exception is named*/ ) { |
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| 182 | ObjectDecl * local_except = /* Dynamic case, same */; |
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| 183 | core->push_back( new DeclStmt( noLabel, local_except ) ); |
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| 184 | } |
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| 185 | // Append the provided statement to the handler. |
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| 186 | core->push_back( cur_handler->get_body() ); |
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| 187 | // Append return onto the inner block? case stmt list? |
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| 188 | CaseStmt * wrapper = new CaseStmt( |
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| 189 | noLabels, |
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| 190 | new ConstantExpr( Constant::from_int( index ) ), |
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| 191 | core |
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| 192 | ); |
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| 193 | handler_wrappers.push_back(wrapper); |
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| 194 | } |
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| 195 | // TODO: Some sort of meaningful error on default perhaps? |
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| 196 | |
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| 197 | SwitchStmt * handler_lookup = new SwitchStmt( |
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| 198 | noLabels, |
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| 199 | /*parameter 0: index*/, |
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| 200 | handler_wrappers, |
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| 201 | false |
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| 202 | ); |
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| 203 | CompoundStmt * body = new CompoundStmt( noLabels ); |
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| 204 | body->push_back( handler_lookup ); |
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| 205 | |
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| 206 | return new FunctionDecl("catch", Type::StorageClasses(), |
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| 207 | LinkageSpec::Cforall, catch_func_t, body); |
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| 208 | } |
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| 209 | |
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| 210 | // Create a single check from a moddified handler. |
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| 211 | CompoundStmt *create_single_matcher( CatchStmt * modded_handler ) { |
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| 212 | CompoundStmt * block = new CompoundStmt( noLables ); |
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| 213 | |
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| 214 | appendDeclStmt( block, modded_handler->get_decl() ); |
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| 215 | |
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| 216 | // TODO: This is not the actual check. |
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| 217 | LogicalExpr * cond = new ConstantExpr( Constant::from_bool( false ) ); |
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| 218 | |
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| 219 | if ( modded_handler->get_cond() ) { |
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| 220 | cond = new LogicalExpr( cond, modded_handler->get_cond() )q |
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| 221 | } |
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| 222 | block->push_back( new IfStmt( noLabels, |
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| 223 | cond, modded_handler->get_body() ); |
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| 224 | |
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| 225 | modded_handler->set_decl( nullptr ); |
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| 226 | modded_handler->set_cond( nullptr ); |
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| 227 | modded_handler->set_body( nullptr ); |
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| 228 | delete modded_handler; |
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| 229 | return block; |
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| 230 | } |
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| 231 | |
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| 232 | FunctionDecl * create_terminate_match( CatchList &handlers ) { |
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| 233 | CompoundStmt * body = new CompoundStmt( noLabels ); |
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| 234 | |
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| 235 | // Index 1..{number of handlers} |
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| 236 | int index = 0; |
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| 237 | CatchList::iterator it; |
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| 238 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) { |
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| 239 | ++index; |
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| 240 | CatchStmt * handler = *it; |
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| 241 | |
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| 242 | // body should have been taken by create_terminate_catch. |
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| 243 | // assert( nullptr == handler->get_body() ); |
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| 244 | handler->set_body( new ReturnStmt( noLabels, |
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| 245 | new ConstantExpr( Constant::from_int( index ) ) ) ); |
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| 246 | |
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| 247 | body->push_back( create_single_matcher( handler ) ); |
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| 248 | } |
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| 249 | |
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| 250 | return new FunctionDecl("match", Type::StorageClasses(), |
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| 251 | LinkageSpec::Cforall, match_func_t, body); |
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| 252 | } |
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| 253 | |
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| 254 | Statement * create_terminate_caller( |
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| 255 | FunctionDecl * try_wrapper, |
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| 256 | FunctionDecl * terminate_catch, |
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| 257 | FunctionDecl * terminate_match) { |
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| 258 | |
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| 259 | ApplicationExpr * caller = new ApplicationExpr( /* ... */ ); |
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| 260 | std::list<Expression *>& args = caller.get_args(); |
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| 261 | args.push_back( nameOf( try_wrapper ) ); |
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| 262 | args.push_back( nameOf( terminate_catch ) ); |
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| 263 | args.push_back( nameOf( terminate_match ) ); |
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| 264 | |
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| 265 | return new ExprStmt( noLabels, caller ); |
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| 266 | } |
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| 267 | |
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| 268 | FunctionDecl * create_resume_handler( CatchList &handlers ) { |
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| 269 | CompoundStmt * body = new CompountStmt( noLabels ); |
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| 270 | |
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| 271 | CatchList::iterator it; |
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| 272 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) { |
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| 273 | CatchStmt * handler = *it; |
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| 274 | |
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| 275 | // Modifiy body. |
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| 276 | CompoundStmt * handling_code = |
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| 277 | dynamic_cast<CompoundStmt*>( handler->get_body() ); |
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| 278 | if ( ! handling_code ) { |
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| 279 | handling_code = new CompoundStmt( noLabels ); |
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| 280 | handling_code->push_back( handler->get_body() ); |
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| 281 | } |
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| 282 | handling_code->push_back( new ReturnStmt( noLabel, |
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| 283 | new ConstantExpr( Constant::from_bool( false ) ) ) ); |
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| 284 | handler->set_body( handling_code ); |
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| 285 | |
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| 286 | // Create the handler. |
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| 287 | body->push_back( create_single_matcher( handler ) ); |
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| 288 | } |
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| 289 | |
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| 290 | return new FunctionDecl("handle", Type::StorageClasses(), |
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| 291 | LinkageSpec::Cforall, handle_func_t, body); |
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| 292 | } |
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| 293 | |
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| 294 | Statement * create_resume_wrapper( |
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| 295 | Statement * wraps, |
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| 296 | FunctionDecl * resume_handler ) { |
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| 297 | CompoundStmt * body = new CompoundStmt( noLabels ); |
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| 298 | |
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| 299 | // struct node = {current top resume handler, call to resume_handler}; |
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| 300 | // __attribute__((cleanup( ... ))); |
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| 301 | // set top resume handler to node. |
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| 302 | // The wrapped statement. |
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| 303 | |
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| 304 | ListInit * node_init; |
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| 305 | { |
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| 306 | std::list<Initializer*> field_inits; |
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| 307 | field_inits.push_back( new SingleInit( /* ... */ ) ); |
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| 308 | field_inits.push_back( new SingleInit( nameOf( resume_handler ) ) ); |
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| 309 | node_init = new ListInit( field_inits ); |
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| 310 | } |
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| 311 | |
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| 312 | std::list< Attribute * > attributes; |
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| 313 | { |
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| 314 | std::list< Expression * > attr_params; |
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| 315 | attr_params.push_back( nameOf( /* ... deconstructor ... */ ) ); |
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| 316 | attrributes.push_back( new Attribute( "cleanup", attr_params ) ); |
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| 317 | } |
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| 318 | |
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| 319 | appendDeclStmt( body, |
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| 320 | /**/ ObjectDecl( |
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| 321 | "resume_node", |
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| 322 | Type::StorageClasses(), |
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| 323 | LinkageSpec::Cforall, |
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| 324 | nullptr, |
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| 325 | /* Type* = resume_node */, |
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| 326 | node_init, |
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| 327 | attributes |
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| 328 | ) |
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| 329 | ); |
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| 330 | body->push_back( wraps ); |
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| 331 | return body; |
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| 332 | } |
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| 333 | |
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| 334 | FunctionDecl * create_finally_wrapper( TryStmt * tryStmt ) { |
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| 335 | CompoundStmt * body = tryStmt->get_finally(); |
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| 336 | tryStmt->set_finally( nullptr ); |
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| 337 | |
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| 338 | return new FunctionDecl("finally", Type::StorageClasses(), |
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| 339 | LinkageSpec::Cforall, void_func_t, body); |
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| 340 | } |
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| 341 | |
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| 342 | ObjectDecl * create_finally_hook( FunctionDecl * finally_wrapper ) { |
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| 343 | // struct _cleanup_hook NAME __attribute__((cleanup( ... ))); |
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| 344 | |
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| 345 | // Make Cleanup Attribute. |
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| 346 | std::list< Attribute * > attributes; |
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| 347 | { |
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| 348 | std::list< Expression * > attr_params; |
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| 349 | attr_params.push_back( nameOf( finally_wrapper ) ); |
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| 350 | attrributes.push_back( new Attribute( "cleanup", attr_params ) ); |
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| 351 | } |
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| 352 | |
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| 353 | return ObjectDecl( /* ... */ |
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| 354 | const std::string &name "finally_hook", |
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| 355 | Type::StorageClasses(), |
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| 356 | LinkageSpec::Cforall, |
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| 357 | nullptr, |
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| 358 | /* ... Type * ... */, |
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| 359 | nullptr, |
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| 360 | attributes |
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| 361 | ); |
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| 362 | } |
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| 363 | |
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| 364 | |
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| 365 | class ExceptionMutatorCore : public WithScoping { |
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| 366 | enum Context { NoHandler, TerHandler, ResHandler }; |
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| 367 | |
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| 368 | // Also need to handle goto, break & continue. |
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| 369 | // They need to be cut off in a ResHandler, until we enter another |
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| 370 | // loop, switch or the goto stays within the function. |
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| 371 | |
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| 372 | Context curContext; |
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| 373 | |
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| 374 | // We might not need this, but a unique base for each try block's |
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| 375 | // generated functions might be nice. |
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| 376 | //std::string curFunctionName; |
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| 377 | //unsigned int try_count = 0; |
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| 378 | |
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| 379 | |
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| 380 | public: |
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| 381 | ExceptionMutatorCore() : |
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| 382 | curContext(NoHandler) |
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| 383 | {} |
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| 384 | |
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| 385 | void premutate( CatchStmt *tryStmt ); |
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| 386 | Statement * postmutate( ThrowStmt *throwStmt ); |
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| 387 | Statement * postmutate( TryStmt *tryStmt ); |
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| 388 | }; |
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| 389 | |
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| 390 | Statement * ExceptionMutatorCore::postmutate( ThrowStmt *throwStmt ) { |
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| 391 | // Ignoring throwStmt->get_target() for now. |
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| 392 | if ( ThrowStmt::Terminate == throwStmt->get_kind() ) { |
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| 393 | if ( throwStmt->get_expr() ) { |
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| 394 | return create_terminate_throw( throwStmt ); |
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| 395 | } else if ( TerHandler == curContext ) { |
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| 396 | return create_terminate_rethrow( throwStmt ); |
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| 397 | } else { |
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| 398 | assertf(false, "Invalid throw in %s at %i\n", |
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| 399 | throwStmt->location.filename, |
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| 400 | throwStmt->location.linenumber); |
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| 401 | return nullptr; |
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| 402 | } |
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| 403 | } else { |
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| 404 | if ( throwStmt->get_expr() ) { |
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| 405 | return create_resume_throw( throwStmt ); |
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| 406 | } else if ( ResHandler == curContext ) { |
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| 407 | return create_resume_rethrow( throwStmt ); |
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| 408 | } else { |
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| 409 | assertf(false, "Invalid throwResume in %s at %i\n", |
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| 410 | throwStmt->location.filename, |
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| 411 | throwStmt->location.linenumber); |
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| 412 | return nullptr; |
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| 413 | } |
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| 414 | } |
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| 415 | } |
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| 416 | |
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| 417 | Statement * ExceptionMutatorCore::postmutate( TryStmt *tryStmt ) { |
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| 418 | // Generate a prefix for the function names? |
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| 419 | |
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| 420 | CompoundStmt * block = new CompoundStmt(); |
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| 421 | Statement * inner = take_try_block( tryStmt ); |
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| 422 | |
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| 423 | if ( tryStmt->get_finally() ) { |
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| 424 | // Define the helper function. |
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| 425 | FunctionDecl * finally_block = |
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| 426 | create_finally_wrapper( tryStmt ); |
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| 427 | appendDeclStmt( block, finally_block ); |
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| 428 | // Create and add the finally cleanup hook. |
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| 429 | appendDeclStmt( block, create_finally_hook( finally_block ) ); |
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| 430 | } |
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| 431 | |
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| 432 | StatementList termination_handlers; |
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| 433 | StatementList resumption_handlers; |
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| 434 | split( tryStmt->get_handlers(), |
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| 435 | termination_handlers, resumption_handlers ); |
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| 436 | |
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| 437 | if ( resumeption_handlers.size() ) { |
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| 438 | // Define the helper function. |
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| 439 | FunctionDecl * resume_handler = |
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| 440 | create_resume_handler( resumption_handlers ); |
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| 441 | appendDeclStmt( block, resume_handler ); |
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| 442 | // Prepare hooks |
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| 443 | inner = create_resume_wrapper( inner, resume_handler ); |
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| 444 | } |
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| 445 | |
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| 446 | if ( termination_handlers.size() ) { |
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| 447 | // Define the three helper functions. |
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| 448 | FunctionDecl * try_wrapper = create_try_wrapper( inner ); |
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| 449 | appendDeclStmt( block, try_wrapper ); |
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| 450 | FunctionDecl * terminate_catch = |
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| 451 | create_terminate_catch( termination_handlers ); |
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| 452 | appendDeclStmt( block, terminate_catch ); |
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| 453 | FunctionDecl * terminate_match = |
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| 454 | create_terminate_match( termination_handlers ); |
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| 455 | appendDeclStmt( block, terminate_match ); |
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| 456 | // Build the call to the try wrapper. |
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| 457 | inner = create_terminate_caller( |
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| 458 | try_wrapper, terminate_catch, terminate_match ); |
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| 459 | } |
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| 460 | |
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| 461 | // Embed the try block. |
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| 462 | block->push_back( inner ); |
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| 463 | |
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| 464 | free_all( termination_handlers ); |
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| 465 | free_all( resumption_handlers ); |
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| 466 | |
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| 467 | return block; |
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| 468 | } |
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| 469 | |
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| 470 | void ExceptionMutatorCore::premutate( CatchStmt *catchStmt ) { |
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| 471 | GuardValue( curContext ); |
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| 472 | if ( CatchStmt::Termination == catchStmt->get_kind() ) { |
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| 473 | curContext = TerHandler; |
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| 474 | } else { |
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| 475 | curContext = ResHandler; |
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| 476 | } |
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| 477 | } |
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| 478 | |
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| 479 | void translateEHM( std::list< Declaration *> & translationUnit ) { |
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| 480 | PassVisitor<ExceptionMutatorCore> translator; |
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| 481 | for ( Declaration * decl : translationUnit ) { |
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| 482 | decl->mutate( translator ); |
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| 483 | } |
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| 484 | } |
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| 485 | } |
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