[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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[288eede] | 12 | // Last Modified On : Thr Jun 29 15:18:00 2017 |
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| 13 | // Update Count : 1 |
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[ba912706] | 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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[288eede] | 18 | #include "SynTree/Statement.h" |
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| 19 | #include "SynTree/Declaration.h" |
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| 20 | #include "SynTree/Expression.h" |
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| 21 | #include "SynTree/Type.h" |
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| 22 | #include "SynTree/Attribute.h" |
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[ba912706] | 23 | |
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| 24 | namespace ControlFlow { |
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| 25 | |
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| 26 | // This (large) section could probably be moved out of the class |
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| 27 | // and be static helpers instead. |
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| 28 | |
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| 29 | // Type(Qualifiers &, false, std::list<Attribute *> &) |
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| 30 | |
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| 31 | // void (*function)() |
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| 32 | static FunctionType void_func_t(Type::Qualifiers(), false); |
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| 33 | // void (*function)(int, exception); |
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| 34 | static FunctionType catch_func_t(Type::Qualifiers(), false); |
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| 35 | // int (*function)(exception); |
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| 36 | static FunctionType match_func_t(Type::Qualifiers(), false); |
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| 37 | // bool (*function)(exception); |
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| 38 | static FunctionType handle_func_t(Type::Qualifiers(), false); |
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| 39 | |
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| 40 | static void init_func_types() { |
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[288eede] | 41 | static bool init_complete = false; |
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[ba912706] | 42 | if (init_complete) { |
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| 43 | return; |
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| 44 | } |
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| 45 | ObjectDecl index_obj( |
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[288eede] | 46 | "__handler_index", |
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[ba912706] | 47 | Type::StorageClasses(), |
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| 48 | LinkageSpec::Cforall, |
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| 49 | /*bitfieldWidth*/ NULL, |
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| 50 | new BasicType(emptyQualifiers, BasicType::UnsignedInt), |
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| 51 | /*init*/ NULL |
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| 52 | ); |
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| 53 | ObjectDecl exception_obj( |
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[288eede] | 54 | "__exception_inst", |
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[ba912706] | 55 | Type::StorageClasses(), |
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| 56 | LinkageSpec::Cforall, |
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| 57 | /*bitfieldWidth*/ NULL, |
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| 58 | new BasicType(emptyQualifiers, BasicType::UnsignedInt), |
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| 59 | /*init*/ NULL |
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| 60 | ); |
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| 61 | ObjectDecl bool_obj( |
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[288eede] | 62 | "__ret_bool", |
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[ba912706] | 63 | Type::StorageClasses(), |
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| 64 | LinkageSpec::Cforall, |
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| 65 | /*bitfieldWidth*/ NULL, |
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| 66 | new BasicType(emptyQualifiers, BasicType::Bool), |
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| 67 | /*init*/ NULL |
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| 68 | ); |
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| 69 | |
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| 70 | catch_func_t.get_parameters().push_back(index_obj.clone()); |
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| 71 | catch_func_t.get_parameters().push_back(exception_obj.clone()); |
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| 72 | match_func_t.get_returnVals().push_back(index_obj.clone()); |
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| 73 | match_func_t.get_parameters().push_back(exception_obj.clone()); |
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| 74 | handle_func_t.get_returnVals().push_back(bool_obj.clone()); |
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| 75 | handle_func_t.get_parameters().push_back(exception_obj.clone()); |
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| 76 | |
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| 77 | init_complete = true; |
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| 78 | } |
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| 79 | |
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| 80 | // Buricratic Helpers (Not having to do with the paritular operation.) |
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| 81 | |
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| 82 | typedef std::list<CatchStmt*> CatchList; |
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| 83 | |
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| 84 | void split( CatchList& allHandlers, CatchList& terHandlers, |
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[1abc5ab] | 85 | CatchList& resHandlers ) { |
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[ba912706] | 86 | while ( !allHandlers.empty() ) { |
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[288eede] | 87 | CatchStmt * stmt = allHandlers.front(); |
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[ba912706] | 88 | allHandlers.pop_front(); |
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[288eede] | 89 | if (CatchStmt::Terminate == stmt->get_kind()) { |
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[ba912706] | 90 | terHandlers.push_back(stmt); |
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| 91 | } else { |
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| 92 | resHandlers.push_back(stmt); |
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| 93 | } |
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| 94 | } |
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| 95 | } |
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| 96 | |
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| 97 | template<typename T> |
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| 98 | void free_all( std::list<T *> &list ) { |
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[288eede] | 99 | typename std::list<T *>::iterator it; |
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[ba912706] | 100 | for ( it = list.begin() ; it != list.end() ; ++it ) { |
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| 101 | delete *it; |
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| 102 | } |
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| 103 | list.clear(); |
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| 104 | } |
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| 105 | |
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| 106 | void appendDeclStmt( CompoundStmt * block, Declaration * item ) { |
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[288eede] | 107 | block->push_back(new DeclStmt(noLabels, item)); |
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[ba912706] | 108 | } |
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| 109 | |
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[288eede] | 110 | Expression * nameOf( DeclarationWithType * decl ) { |
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| 111 | return new VariableExpr( decl ); |
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[ba912706] | 112 | } |
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| 113 | |
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| 114 | // ThrowStmt Mutation Helpers |
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| 115 | |
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| 116 | Statement * create_terminate_throw( ThrowStmt *throwStmt ) { |
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| 117 | // __throw_terminate( EXPR ); |
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[288eede] | 118 | UntypedExpr * call = new UntypedExpr( new NameExpr( |
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| 119 | "__cfaehm__throw_termination" ) ); |
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| 120 | call->get_args().push_back( throwStmt->get_expr() ); |
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[ba912706] | 121 | Statement * result = new ExprStmt( throwStmt->get_labels(), call ); |
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| 122 | throwStmt->set_expr( nullptr ); |
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| 123 | delete throwStmt; |
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| 124 | return result; |
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| 125 | } |
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| 126 | Statement * create_terminate_rethrow( ThrowStmt *throwStmt ) { |
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| 127 | // __rethrow_terminate(); |
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[288eede] | 128 | assert( nullptr == throwStmt->get_expr() ); |
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[ba912706] | 129 | Statement * result = new ExprStmt( |
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| 130 | throwStmt->get_labels(), |
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[288eede] | 131 | new UntypedExpr( new NameExpr( "__cfaehm__rethrow_termination" ) ) |
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[ba912706] | 132 | ); |
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| 133 | delete throwStmt; |
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| 134 | return result; |
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| 135 | } |
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| 136 | Statement * create_resume_throw( ThrowStmt *throwStmt ) { |
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| 137 | // __throw_resume( EXPR ); |
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[288eede] | 138 | UntypedExpr * call = new UntypedExpr( new NameExpr( |
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| 139 | "__cfaehm__throw_resumption" ) ); |
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| 140 | call->get_args().push_back( throwStmt->get_expr() ); |
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[ba912706] | 141 | Statement * result = new ExprStmt( throwStmt->get_labels(), call ); |
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| 142 | throwStmt->set_expr( nullptr ); |
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| 143 | delete throwStmt; |
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| 144 | return result; |
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| 145 | } |
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| 146 | Statement * create_resume_rethrow( ThrowStmt *throwStmt ) { |
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| 147 | // return false; |
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| 148 | Statement * result = new ReturnStmt( |
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| 149 | throwStmt->get_labels(), |
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[288eede] | 150 | new ConstantExpr( Constant::from_bool( false ) ) |
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[ba912706] | 151 | ); |
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| 152 | delete throwStmt; |
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| 153 | return result; |
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| 154 | } |
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| 155 | |
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| 156 | // TryStmt Mutation Helpers |
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| 157 | |
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| 158 | CompoundStmt * take_try_block( TryStmt *tryStmt ) { |
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| 159 | CompoundStmt * block = tryStmt->get_block(); |
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| 160 | tryStmt->set_block( nullptr ); |
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| 161 | return block; |
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| 162 | } |
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[288eede] | 163 | FunctionDecl * create_try_wrapper( CompoundStmt *body ) { |
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[ba912706] | 164 | |
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[288eede] | 165 | return new FunctionDecl( "try", Type::StorageClasses(), |
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| 166 | LinkageSpec::Cforall, void_func_t.clone(), body ); |
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[ba912706] | 167 | } |
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| 168 | |
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| 169 | FunctionDecl * create_terminate_catch( CatchList &handlers ) { |
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| 170 | std::list<CaseStmt *> handler_wrappers; |
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| 171 | |
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[288eede] | 172 | FunctionType *func_type = catch_func_t.clone(); |
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| 173 | DeclarationWithType * index_obj = func_type->get_parameters().front(); |
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| 174 | // DeclarationWithType * except_obj = func_type->get_parameters().back(); |
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| 175 | |
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[ba912706] | 176 | // Index 1..{number of handlers} |
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| 177 | int index = 0; |
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| 178 | CatchList::iterator it = handlers.begin(); |
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| 179 | for ( ; it != handlers.end() ; ++it ) { |
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| 180 | ++index; |
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| 181 | CatchStmt * handler = *it; |
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| 182 | |
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[288eede] | 183 | // INTEGERconstant Version |
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| 184 | // case `index`: |
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| 185 | // { |
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| 186 | // `handler.body` |
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| 187 | // } |
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| 188 | // return; |
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| 189 | std::list<Statement *> caseBody; |
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| 190 | caseBody.push_back( handler->get_body() ); |
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| 191 | handler->set_body( nullptr ); |
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| 192 | caseBody.push_back( new ReturnStmt( noLabels, nullptr ) ); |
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| 193 | |
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| 194 | handler_wrappers.push_back( new CaseStmt( |
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[ba912706] | 195 | noLabels, |
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| 196 | new ConstantExpr( Constant::from_int( index ) ), |
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[288eede] | 197 | caseBody |
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| 198 | ) ); |
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[ba912706] | 199 | } |
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| 200 | // TODO: Some sort of meaningful error on default perhaps? |
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| 201 | |
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[288eede] | 202 | std::list<Statement*> stmt_handlers; |
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| 203 | while ( !handler_wrappers.empty() ) { |
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| 204 | stmt_handlers.push_back( handler_wrappers.front() ); |
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| 205 | handler_wrappers.pop_front(); |
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| 206 | } |
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| 207 | |
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[ba912706] | 208 | SwitchStmt * handler_lookup = new SwitchStmt( |
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| 209 | noLabels, |
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[288eede] | 210 | nameOf( index_obj ), |
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| 211 | stmt_handlers |
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[ba912706] | 212 | ); |
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| 213 | CompoundStmt * body = new CompoundStmt( noLabels ); |
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| 214 | body->push_back( handler_lookup ); |
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| 215 | |
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| 216 | return new FunctionDecl("catch", Type::StorageClasses(), |
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[288eede] | 217 | LinkageSpec::Cforall, func_type, body); |
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[ba912706] | 218 | } |
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| 219 | |
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| 220 | // Create a single check from a moddified handler. |
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[288eede] | 221 | // except_obj is referenced, modded_handler will be freed. |
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| 222 | CompoundStmt *create_single_matcher( |
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| 223 | DeclarationWithType * except_obj, CatchStmt * modded_handler ) { |
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| 224 | CompoundStmt * block = new CompoundStmt( noLabels ); |
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| 225 | |
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| 226 | // INTEGERconstant Version |
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| 227 | assert( nullptr == modded_handler->get_decl() ); |
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| 228 | ConstantExpr * number = |
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| 229 | dynamic_cast<ConstantExpr*>( modded_handler->get_cond() ); |
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| 230 | assert( number ); |
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| 231 | modded_handler->set_cond( nullptr ); |
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[ba912706] | 232 | |
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[288eede] | 233 | Expression * cond; |
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| 234 | { |
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| 235 | std::list<Expression *> args; |
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| 236 | args.push_back( number ); |
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| 237 | args.push_back( nameOf( except_obj ) ); |
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| 238 | cond = new UntypedExpr( new NameExpr( "?==?" /*???*/), args ); |
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| 239 | } |
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[ba912706] | 240 | |
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| 241 | if ( modded_handler->get_cond() ) { |
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[288eede] | 242 | cond = new LogicalExpr( cond, modded_handler->get_cond() ); |
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[ba912706] | 243 | } |
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| 244 | block->push_back( new IfStmt( noLabels, |
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[288eede] | 245 | cond, modded_handler->get_body(), nullptr ) ); |
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[ba912706] | 246 | |
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| 247 | modded_handler->set_decl( nullptr ); |
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| 248 | modded_handler->set_cond( nullptr ); |
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| 249 | modded_handler->set_body( nullptr ); |
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| 250 | delete modded_handler; |
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| 251 | return block; |
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| 252 | } |
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| 253 | |
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| 254 | FunctionDecl * create_terminate_match( CatchList &handlers ) { |
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| 255 | CompoundStmt * body = new CompoundStmt( noLabels ); |
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| 256 | |
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[288eede] | 257 | FunctionType * func_type = match_func_t.clone(); |
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| 258 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
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| 259 | |
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[ba912706] | 260 | // Index 1..{number of handlers} |
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| 261 | int index = 0; |
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| 262 | CatchList::iterator it; |
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| 263 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) { |
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| 264 | ++index; |
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| 265 | CatchStmt * handler = *it; |
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| 266 | |
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[288eede] | 267 | // Body should have been taken by create_terminate_catch. |
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| 268 | assert( nullptr == handler->get_body() ); |
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| 269 | |
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| 270 | // Create new body. |
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[ba912706] | 271 | handler->set_body( new ReturnStmt( noLabels, |
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| 272 | new ConstantExpr( Constant::from_int( index ) ) ) ); |
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| 273 | |
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[288eede] | 274 | // Create the handler. |
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| 275 | body->push_back( create_single_matcher( except_obj, handler ) ); |
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| 276 | *it = nullptr; |
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[ba912706] | 277 | } |
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| 278 | |
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| 279 | return new FunctionDecl("match", Type::StorageClasses(), |
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[288eede] | 280 | LinkageSpec::Cforall, func_type, body); |
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[ba912706] | 281 | } |
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| 282 | |
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[288eede] | 283 | CompoundStmt * create_terminate_caller( |
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[ba912706] | 284 | FunctionDecl * try_wrapper, |
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| 285 | FunctionDecl * terminate_catch, |
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| 286 | FunctionDecl * terminate_match) { |
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| 287 | |
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[288eede] | 288 | UntypedExpr * caller = new UntypedExpr( new NameExpr( |
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| 289 | "__cfaehm__try_terminate" ) ); |
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| 290 | std::list<Expression *>& args = caller->get_args(); |
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[ba912706] | 291 | args.push_back( nameOf( try_wrapper ) ); |
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| 292 | args.push_back( nameOf( terminate_catch ) ); |
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| 293 | args.push_back( nameOf( terminate_match ) ); |
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| 294 | |
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[288eede] | 295 | CompoundStmt * callStmt = new CompoundStmt( noLabels ); |
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| 296 | callStmt->push_back( new ExprStmt( noLabels, caller ) ); |
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| 297 | return callStmt; |
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[ba912706] | 298 | } |
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| 299 | |
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| 300 | FunctionDecl * create_resume_handler( CatchList &handlers ) { |
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[288eede] | 301 | CompoundStmt * body = new CompoundStmt( noLabels ); |
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| 302 | |
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| 303 | FunctionType * func_type = match_func_t.clone(); |
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| 304 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
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[ba912706] | 305 | |
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| 306 | CatchList::iterator it; |
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| 307 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) { |
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| 308 | CatchStmt * handler = *it; |
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| 309 | |
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| 310 | // Modifiy body. |
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| 311 | CompoundStmt * handling_code = |
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| 312 | dynamic_cast<CompoundStmt*>( handler->get_body() ); |
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| 313 | if ( ! handling_code ) { |
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| 314 | handling_code = new CompoundStmt( noLabels ); |
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| 315 | handling_code->push_back( handler->get_body() ); |
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| 316 | } |
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[288eede] | 317 | handling_code->push_back( new ReturnStmt( noLabels, |
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[ba912706] | 318 | new ConstantExpr( Constant::from_bool( false ) ) ) ); |
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| 319 | handler->set_body( handling_code ); |
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| 320 | |
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| 321 | // Create the handler. |
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[288eede] | 322 | body->push_back( create_single_matcher( except_obj, handler ) ); |
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| 323 | *it = nullptr; |
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[ba912706] | 324 | } |
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| 325 | |
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| 326 | return new FunctionDecl("handle", Type::StorageClasses(), |
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[288eede] | 327 | LinkageSpec::Cforall, func_type, body); |
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[ba912706] | 328 | } |
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| 329 | |
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[288eede] | 330 | CompoundStmt * create_resume_wrapper( |
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| 331 | StructDecl * node_decl, |
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[ba912706] | 332 | Statement * wraps, |
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| 333 | FunctionDecl * resume_handler ) { |
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| 334 | CompoundStmt * body = new CompoundStmt( noLabels ); |
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| 335 | |
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[288eede] | 336 | // struct __try_resume_node __resume_node |
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| 337 | // __attribute__((cleanup( __cfaehm__try_resume_cleanup ))); |
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| 338 | // ** unwinding of the stack here could cause problems ** |
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| 339 | // ** however I don't think that can happen currently ** |
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| 340 | // __cfaehm__try_resume_setup( &__resume_node, resume_handler ); |
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[ba912706] | 341 | |
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| 342 | std::list< Attribute * > attributes; |
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| 343 | { |
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| 344 | std::list< Expression * > attr_params; |
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[288eede] | 345 | attr_params.push_back( new NameExpr( |
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| 346 | "__cfaehm__try_resume_cleanup" ) ); |
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| 347 | attributes.push_back( new Attribute( "cleanup", attr_params ) ); |
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[ba912706] | 348 | } |
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| 349 | |
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[288eede] | 350 | ObjectDecl * obj = new ObjectDecl( |
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| 351 | "__resume_node", |
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[ba912706] | 352 | Type::StorageClasses(), |
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| 353 | LinkageSpec::Cforall, |
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| 354 | nullptr, |
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[288eede] | 355 | new StructInstType( |
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| 356 | Type::Qualifiers(), |
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| 357 | node_decl |
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| 358 | ), |
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| 359 | nullptr, |
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[ba912706] | 360 | attributes |
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[288eede] | 361 | ); |
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| 362 | appendDeclStmt( body, obj ); |
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| 363 | |
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| 364 | UntypedExpr *setup = new UntypedExpr( new NameExpr( |
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| 365 | "__cfaehm__try_resume_setup" ) ); |
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| 366 | setup->get_args().push_back( nameOf( obj ) ); |
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| 367 | setup->get_args().push_back( nameOf( resume_handler ) ); |
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| 368 | |
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| 369 | body->push_back( new ExprStmt( noLabels, setup ) ); |
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| 370 | |
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[ba912706] | 371 | body->push_back( wraps ); |
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| 372 | return body; |
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| 373 | } |
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| 374 | |
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| 375 | FunctionDecl * create_finally_wrapper( TryStmt * tryStmt ) { |
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[288eede] | 376 | FinallyStmt * finally = tryStmt->get_finally(); |
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| 377 | CompoundStmt * body = finally->get_block(); |
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| 378 | finally->set_block( nullptr ); |
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| 379 | delete finally; |
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[ba912706] | 380 | tryStmt->set_finally( nullptr ); |
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| 381 | |
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| 382 | return new FunctionDecl("finally", Type::StorageClasses(), |
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[288eede] | 383 | LinkageSpec::Cforall, void_func_t.clone(), body); |
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[ba912706] | 384 | } |
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| 385 | |
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[288eede] | 386 | ObjectDecl * create_finally_hook( |
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| 387 | StructDecl * hook_decl, FunctionDecl * finally_wrapper ) { |
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| 388 | // struct __cfaehm__cleanup_hook __finally_hook |
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| 389 | // __attribute__((cleanup( finally_wrapper ))); |
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[ba912706] | 390 | |
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| 391 | // Make Cleanup Attribute. |
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| 392 | std::list< Attribute * > attributes; |
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| 393 | { |
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| 394 | std::list< Expression * > attr_params; |
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| 395 | attr_params.push_back( nameOf( finally_wrapper ) ); |
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[288eede] | 396 | attributes.push_back( new Attribute( "cleanup", attr_params ) ); |
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[ba912706] | 397 | } |
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| 398 | |
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[288eede] | 399 | return new ObjectDecl( |
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| 400 | "__finally_hook", |
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[ba912706] | 401 | Type::StorageClasses(), |
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| 402 | LinkageSpec::Cforall, |
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| 403 | nullptr, |
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[288eede] | 404 | new StructInstType( |
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| 405 | emptyQualifiers, |
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| 406 | hook_decl |
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| 407 | ), |
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[ba912706] | 408 | nullptr, |
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| 409 | attributes |
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| 410 | ); |
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| 411 | } |
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| 412 | |
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| 413 | |
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[1abc5ab] | 414 | class ExceptionMutatorCore : public WithGuards { |
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[ba912706] | 415 | enum Context { NoHandler, TerHandler, ResHandler }; |
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| 416 | |
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| 417 | // Also need to handle goto, break & continue. |
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| 418 | // They need to be cut off in a ResHandler, until we enter another |
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| 419 | // loop, switch or the goto stays within the function. |
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| 420 | |
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[288eede] | 421 | Context cur_context; |
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[ba912706] | 422 | |
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| 423 | // We might not need this, but a unique base for each try block's |
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| 424 | // generated functions might be nice. |
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| 425 | //std::string curFunctionName; |
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| 426 | //unsigned int try_count = 0; |
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| 427 | |
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[288eede] | 428 | StructDecl *node_decl; |
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| 429 | StructDecl *hook_decl; |
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[ba912706] | 430 | |
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| 431 | public: |
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| 432 | ExceptionMutatorCore() : |
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[288eede] | 433 | cur_context(NoHandler), |
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| 434 | node_decl(nullptr), hook_decl(nullptr) |
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[ba912706] | 435 | {} |
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| 436 | |
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[288eede] | 437 | void premutate( CatchStmt *catchStmt ); |
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| 438 | void premutate( StructDecl *structDecl ); |
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[ba912706] | 439 | Statement * postmutate( ThrowStmt *throwStmt ); |
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| 440 | Statement * postmutate( TryStmt *tryStmt ); |
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| 441 | }; |
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| 442 | |
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| 443 | Statement * ExceptionMutatorCore::postmutate( ThrowStmt *throwStmt ) { |
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| 444 | // Ignoring throwStmt->get_target() for now. |
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| 445 | if ( ThrowStmt::Terminate == throwStmt->get_kind() ) { |
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| 446 | if ( throwStmt->get_expr() ) { |
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| 447 | return create_terminate_throw( throwStmt ); |
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[288eede] | 448 | } else if ( TerHandler == cur_context ) { |
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[ba912706] | 449 | return create_terminate_rethrow( throwStmt ); |
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| 450 | } else { |
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| 451 | assertf(false, "Invalid throw in %s at %i\n", |
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[288eede] | 452 | throwStmt->location.filename.c_str(), |
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[ba912706] | 453 | throwStmt->location.linenumber); |
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| 454 | return nullptr; |
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| 455 | } |
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| 456 | } else { |
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| 457 | if ( throwStmt->get_expr() ) { |
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| 458 | return create_resume_throw( throwStmt ); |
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[288eede] | 459 | } else if ( ResHandler == cur_context ) { |
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[ba912706] | 460 | return create_resume_rethrow( throwStmt ); |
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| 461 | } else { |
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| 462 | assertf(false, "Invalid throwResume in %s at %i\n", |
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[288eede] | 463 | throwStmt->location.filename.c_str(), |
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[ba912706] | 464 | throwStmt->location.linenumber); |
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| 465 | return nullptr; |
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| 466 | } |
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| 467 | } |
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| 468 | } |
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| 469 | |
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| 470 | Statement * ExceptionMutatorCore::postmutate( TryStmt *tryStmt ) { |
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[288eede] | 471 | assert( node_decl ); |
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| 472 | assert( hook_decl ); |
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| 473 | |
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[ba912706] | 474 | // Generate a prefix for the function names? |
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| 475 | |
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[288eede] | 476 | CompoundStmt * block = new CompoundStmt( noLabels ); |
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| 477 | CompoundStmt * inner = take_try_block( tryStmt ); |
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[ba912706] | 478 | |
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| 479 | if ( tryStmt->get_finally() ) { |
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| 480 | // Define the helper function. |
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| 481 | FunctionDecl * finally_block = |
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| 482 | create_finally_wrapper( tryStmt ); |
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| 483 | appendDeclStmt( block, finally_block ); |
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| 484 | // Create and add the finally cleanup hook. |
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[288eede] | 485 | appendDeclStmt( block, |
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| 486 | create_finally_hook( hook_decl, finally_block ) ); |
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[ba912706] | 487 | } |
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| 488 | |
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[288eede] | 489 | CatchList termination_handlers; |
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| 490 | CatchList resumption_handlers; |
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| 491 | split( tryStmt->get_catchers(), |
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[1abc5ab] | 492 | termination_handlers, resumption_handlers ); |
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[ba912706] | 493 | |
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[288eede] | 494 | if ( resumption_handlers.size() ) { |
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[ba912706] | 495 | // Define the helper function. |
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| 496 | FunctionDecl * resume_handler = |
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| 497 | create_resume_handler( resumption_handlers ); |
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| 498 | appendDeclStmt( block, resume_handler ); |
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| 499 | // Prepare hooks |
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[288eede] | 500 | inner = create_resume_wrapper( node_decl, inner, resume_handler ); |
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[ba912706] | 501 | } |
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| 502 | |
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| 503 | if ( termination_handlers.size() ) { |
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| 504 | // Define the three helper functions. |
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| 505 | FunctionDecl * try_wrapper = create_try_wrapper( inner ); |
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| 506 | appendDeclStmt( block, try_wrapper ); |
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| 507 | FunctionDecl * terminate_catch = |
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| 508 | create_terminate_catch( termination_handlers ); |
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| 509 | appendDeclStmt( block, terminate_catch ); |
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| 510 | FunctionDecl * terminate_match = |
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| 511 | create_terminate_match( termination_handlers ); |
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| 512 | appendDeclStmt( block, terminate_match ); |
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| 513 | // Build the call to the try wrapper. |
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| 514 | inner = create_terminate_caller( |
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| 515 | try_wrapper, terminate_catch, terminate_match ); |
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| 516 | } |
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| 517 | |
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| 518 | // Embed the try block. |
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| 519 | block->push_back( inner ); |
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| 520 | |
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[288eede] | 521 | //free_all( termination_handlers ); |
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| 522 | //free_all( resumption_handlers ); |
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[ba912706] | 523 | |
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| 524 | return block; |
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| 525 | } |
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| 526 | |
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| 527 | void ExceptionMutatorCore::premutate( CatchStmt *catchStmt ) { |
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[288eede] | 528 | GuardValue( cur_context ); |
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| 529 | if ( CatchStmt::Terminate == catchStmt->get_kind() ) { |
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| 530 | cur_context = TerHandler; |
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[ba912706] | 531 | } else { |
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[288eede] | 532 | cur_context = ResHandler; |
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[ba912706] | 533 | } |
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| 534 | } |
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| 535 | |
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[288eede] | 536 | void ExceptionMutatorCore::premutate( StructDecl *structDecl ) { |
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| 537 | if ( !structDecl->has_body() ) { |
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| 538 | // Skip children? |
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| 539 | return; |
---|
| 540 | } else if ( structDecl->get_name() == "__cfaehm__try_resume_node" ) { |
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| 541 | assert( nullptr == node_decl ); |
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| 542 | node_decl = structDecl; |
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| 543 | } else if ( structDecl->get_name() == "__cfaehm__cleanup_hook" ) { |
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| 544 | assert( nullptr == hook_decl ); |
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| 545 | hook_decl = structDecl; |
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| 546 | } |
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| 547 | // Later we might get the exception type as well. |
---|
| 548 | } |
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| 549 | |
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[1abc5ab] | 550 | void translateEHM( std::list< Declaration *> & translationUnit ) { |
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[288eede] | 551 | init_func_types(); |
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| 552 | |
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[ba912706] | 553 | PassVisitor<ExceptionMutatorCore> translator; |
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| 554 | for ( Declaration * decl : translationUnit ) { |
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[288eede] | 555 | decl->acceptMutator( translator ); |
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[ba912706] | 556 | } |
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| 557 | } |
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| 558 | } |
---|