[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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[03eedd5] | 12 | // Last Modified On : Fri Jul 28 15:34:00 2017 |
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| 13 | // Update Count : 6 |
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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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[86d5ba7c] | 23 | #include "SynTree/VarExprReplacer.h" |
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[ba912706] | 24 | |
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[307a732] | 25 | namespace ControlStruct { |
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[ba912706] | 26 | |
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[307a732] | 27 | // void (*function)(); |
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[86d5ba7c] | 28 | static FunctionType try_func_t(noQualifiers, false); |
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[ba912706] | 29 | // void (*function)(int, exception); |
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[86d5ba7c] | 30 | static FunctionType catch_func_t(noQualifiers, false); |
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[ba912706] | 31 | // int (*function)(exception); |
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[86d5ba7c] | 32 | static FunctionType match_func_t(noQualifiers, false); |
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[ba912706] | 33 | // bool (*function)(exception); |
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[86d5ba7c] | 34 | static FunctionType handle_func_t(noQualifiers, false); |
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[307a732] | 35 | // void (*function)(__attribute__((unused)) void *); |
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[86d5ba7c] | 36 | static FunctionType finally_func_t(noQualifiers, false); |
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[ba912706] | 37 | |
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| 38 | static void init_func_types() { |
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[288eede] | 39 | static bool init_complete = false; |
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[ba912706] | 40 | if (init_complete) { |
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| 41 | return; |
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| 42 | } |
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| 43 | ObjectDecl index_obj( |
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[288eede] | 44 | "__handler_index", |
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[ba912706] | 45 | Type::StorageClasses(), |
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| 46 | LinkageSpec::Cforall, |
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| 47 | /*bitfieldWidth*/ NULL, |
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[ac10576] | 48 | new BasicType( noQualifiers, BasicType::SignedInt ), |
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[ba912706] | 49 | /*init*/ NULL |
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[307a732] | 50 | ); |
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[ba912706] | 51 | ObjectDecl exception_obj( |
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[288eede] | 52 | "__exception_inst", |
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[ba912706] | 53 | Type::StorageClasses(), |
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| 54 | LinkageSpec::Cforall, |
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| 55 | /*bitfieldWidth*/ NULL, |
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[307a732] | 56 | new PointerType( |
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[ac10576] | 57 | noQualifiers, |
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| 58 | new BasicType( noQualifiers, BasicType::SignedInt ) |
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[307a732] | 59 | ), |
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[ba912706] | 60 | /*init*/ NULL |
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[307a732] | 61 | ); |
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[ba912706] | 62 | ObjectDecl bool_obj( |
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[288eede] | 63 | "__ret_bool", |
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[ba912706] | 64 | Type::StorageClasses(), |
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| 65 | LinkageSpec::Cforall, |
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| 66 | /*bitfieldWidth*/ NULL, |
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[ac10576] | 67 | new BasicType(noQualifiers, BasicType::Bool), |
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[ba912706] | 68 | /*init*/ NULL |
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[307a732] | 69 | ); |
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| 70 | ObjectDecl voidptr_obj( |
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| 71 | "__hook", |
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| 72 | Type::StorageClasses(), |
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| 73 | LinkageSpec::Cforall, |
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| 74 | NULL, |
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| 75 | new PointerType( |
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[ac10576] | 76 | noQualifiers, |
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[307a732] | 77 | new VoidType( |
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[ac10576] | 78 | noQualifiers |
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[307a732] | 79 | ), |
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| 80 | std::list<Attribute *>{new Attribute("unused")} |
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| 81 | ), |
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| 82 | NULL |
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| 83 | ); |
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[ba912706] | 84 | |
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[307a732] | 85 | catch_func_t.get_parameters().push_back( index_obj.clone() ); |
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| 86 | catch_func_t.get_parameters().push_back( exception_obj.clone() ); |
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| 87 | match_func_t.get_returnVals().push_back( index_obj.clone() ); |
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| 88 | match_func_t.get_parameters().push_back( exception_obj.clone() ); |
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| 89 | handle_func_t.get_returnVals().push_back( bool_obj.clone() ); |
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| 90 | handle_func_t.get_parameters().push_back( exception_obj.clone() ); |
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| 91 | finally_func_t.get_parameters().push_back( voidptr_obj.clone() ); |
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[ba912706] | 92 | |
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| 93 | init_complete = true; |
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| 94 | } |
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| 95 | |
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| 96 | // Buricratic Helpers (Not having to do with the paritular operation.) |
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| 97 | |
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| 98 | typedef std::list<CatchStmt*> CatchList; |
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| 99 | |
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| 100 | void split( CatchList& allHandlers, CatchList& terHandlers, |
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[1abc5ab] | 101 | CatchList& resHandlers ) { |
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[ba912706] | 102 | while ( !allHandlers.empty() ) { |
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[288eede] | 103 | CatchStmt * stmt = allHandlers.front(); |
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[ba912706] | 104 | allHandlers.pop_front(); |
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[288eede] | 105 | if (CatchStmt::Terminate == stmt->get_kind()) { |
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[ba912706] | 106 | terHandlers.push_back(stmt); |
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| 107 | } else { |
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| 108 | resHandlers.push_back(stmt); |
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| 109 | } |
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| 110 | } |
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| 111 | } |
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| 112 | |
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| 113 | void appendDeclStmt( CompoundStmt * block, Declaration * item ) { |
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[288eede] | 114 | block->push_back(new DeclStmt(noLabels, item)); |
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[ba912706] | 115 | } |
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| 116 | |
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[288eede] | 117 | Expression * nameOf( DeclarationWithType * decl ) { |
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| 118 | return new VariableExpr( decl ); |
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[ba912706] | 119 | } |
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| 120 | |
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| 121 | // ThrowStmt Mutation Helpers |
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| 122 | |
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[307a732] | 123 | Statement * create_given_throw( |
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| 124 | const char * throwFunc, ThrowStmt * throwStmt ) { |
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[86d5ba7c] | 125 | // There is an extra copy here we might be able to remove with |
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| 126 | // references. |
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[307a732] | 127 | // { int NAME = EXPR; throwFunc( &NAME ); } |
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| 128 | CompoundStmt * result = new CompoundStmt( noLabels ); |
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| 129 | ObjectDecl * local = new ObjectDecl( |
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| 130 | "__local_exception_copy", |
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| 131 | Type::StorageClasses(), |
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| 132 | LinkageSpec::Cforall, |
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| 133 | NULL, |
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[ac10576] | 134 | new BasicType( noQualifiers, BasicType::SignedInt ), |
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[307a732] | 135 | new SingleInit( throwStmt->get_expr() ) |
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| 136 | ); |
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| 137 | appendDeclStmt( result, local ); |
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| 138 | UntypedExpr * call = new UntypedExpr( new NameExpr( throwFunc ) ); |
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| 139 | call->get_args().push_back( new AddressExpr( nameOf( local ) ) ); |
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| 140 | result->push_back( new ExprStmt( throwStmt->get_labels(), call ) ); |
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[ba912706] | 141 | throwStmt->set_expr( nullptr ); |
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| 142 | delete throwStmt; |
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| 143 | return result; |
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| 144 | } |
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[307a732] | 145 | |
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| 146 | Statement * create_terminate_throw( ThrowStmt *throwStmt ) { |
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| 147 | // { int NAME = EXPR; __throw_terminate( &NAME ); } |
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[38ac6ec] | 148 | return create_given_throw( "__cfaehm__throw_terminate", throwStmt ); |
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[307a732] | 149 | } |
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[86d5ba7c] | 150 | |
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| 151 | Statement * create_terminate_rethrow( ThrowStmt *throwStmt, |
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| 152 | ObjectDecl *handler_except_decl ) { |
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| 153 | // { `handler_except_decl` = NULL; __rethrow_terminate(); } |
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[288eede] | 154 | assert( nullptr == throwStmt->get_expr() ); |
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[86d5ba7c] | 155 | assert( handler_except_decl ); |
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| 156 | |
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| 157 | CompoundStmt * result = new CompoundStmt( throwStmt->get_labels() ); |
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| 158 | result->push_back( new ExprStmt( noLabels, UntypedExpr::createAssign( |
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| 159 | nameOf( handler_except_decl ), |
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| 160 | new ConstantExpr( Constant::null( |
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| 161 | new PointerType( |
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| 162 | noQualifiers, |
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| 163 | handler_except_decl->get_type()->clone() |
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| 164 | ) |
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| 165 | ) ) |
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| 166 | ) ) ); |
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| 167 | result->push_back( new ExprStmt( |
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| 168 | noLabels, |
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[38ac6ec] | 169 | new UntypedExpr( new NameExpr( "__cfaehm__rethrow_terminate" ) ) |
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[86d5ba7c] | 170 | ) ); |
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[ba912706] | 171 | delete throwStmt; |
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| 172 | return result; |
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| 173 | } |
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[86d5ba7c] | 174 | |
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[ba912706] | 175 | Statement * create_resume_throw( ThrowStmt *throwStmt ) { |
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| 176 | // __throw_resume( EXPR ); |
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[38ac6ec] | 177 | return create_given_throw( "__cfaehm__throw_resume", throwStmt ); |
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[ba912706] | 178 | } |
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[86d5ba7c] | 179 | |
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[ba912706] | 180 | Statement * create_resume_rethrow( ThrowStmt *throwStmt ) { |
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| 181 | // return false; |
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| 182 | Statement * result = new ReturnStmt( |
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| 183 | throwStmt->get_labels(), |
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[288eede] | 184 | new ConstantExpr( Constant::from_bool( false ) ) |
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[ba912706] | 185 | ); |
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| 186 | delete throwStmt; |
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| 187 | return result; |
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| 188 | } |
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| 189 | |
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| 190 | // TryStmt Mutation Helpers |
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| 191 | |
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| 192 | CompoundStmt * take_try_block( TryStmt *tryStmt ) { |
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| 193 | CompoundStmt * block = tryStmt->get_block(); |
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| 194 | tryStmt->set_block( nullptr ); |
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| 195 | return block; |
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| 196 | } |
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[288eede] | 197 | FunctionDecl * create_try_wrapper( CompoundStmt *body ) { |
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[ba912706] | 198 | |
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[288eede] | 199 | return new FunctionDecl( "try", Type::StorageClasses(), |
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[307a732] | 200 | LinkageSpec::Cforall, try_func_t.clone(), body ); |
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[ba912706] | 201 | } |
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| 202 | |
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| 203 | FunctionDecl * create_terminate_catch( CatchList &handlers ) { |
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| 204 | std::list<CaseStmt *> handler_wrappers; |
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| 205 | |
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[288eede] | 206 | FunctionType *func_type = catch_func_t.clone(); |
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| 207 | DeclarationWithType * index_obj = func_type->get_parameters().front(); |
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[86d5ba7c] | 208 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
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[288eede] | 209 | |
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[ba912706] | 210 | // Index 1..{number of handlers} |
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| 211 | int index = 0; |
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| 212 | CatchList::iterator it = handlers.begin(); |
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| 213 | for ( ; it != handlers.end() ; ++it ) { |
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| 214 | ++index; |
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| 215 | CatchStmt * handler = *it; |
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| 216 | |
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[288eede] | 217 | // INTEGERconstant Version |
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| 218 | // case `index`: |
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| 219 | // { |
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[86d5ba7c] | 220 | // `handler.decl` {inserted} = { except_obj }; |
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[288eede] | 221 | // `handler.body` |
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| 222 | // } |
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| 223 | // return; |
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[86d5ba7c] | 224 | CompoundStmt * block = new CompoundStmt( noLabels ); |
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| 225 | |
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[03eedd5] | 226 | // Just copy the exception value. (Post Validation) |
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[86d5ba7c] | 227 | ObjectDecl * handler_decl = |
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[03eedd5] | 228 | static_cast<ObjectDecl *>( handler->get_decl() ); |
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[86d5ba7c] | 229 | ObjectDecl * local_except = handler_decl->clone(); |
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| 230 | local_except->set_init( |
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| 231 | new ListInit({ new SingleInit( nameOf( except_obj ) ) }) ); |
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| 232 | #if 0 |
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| 233 | // Virtual Exception Vision |
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| 234 | // case `index`: |
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| 235 | // { |
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| 236 | // `handler.decl` = { (virtual `decl.type`)`except` }; |
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| 237 | // `handler.body`; |
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| 238 | // } |
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| 239 | // return; |
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| 240 | |
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| 241 | // Save a cast copy of the exception (should always succeed). |
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[03eedd5] | 242 | local_except->set_init( |
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[86d5ba7c] | 243 | new ListInit({ new SingleInit( |
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| 244 | new VirtualCastExpr( nameOf( except_obj ), |
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| 245 | local_except->get_type() |
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| 246 | ) |
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[03eedd5] | 247 | ) }) |
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| 248 | ); |
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[86d5ba7c] | 249 | #endif |
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| 250 | block->push_back( new DeclStmt( noLabels, local_except ) ); |
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| 251 | |
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| 252 | // Add the cleanup attribute. |
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| 253 | local_except->get_attributes().push_back( new Attribute( |
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| 254 | "cleanup", |
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| 255 | { new NameExpr( "__cfaehm__cleanup_terminate" ) } |
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| 256 | ) ); |
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| 257 | |
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| 258 | // Update variables in the body to point to this local copy. |
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| 259 | { |
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| 260 | VarExprReplacer::DeclMap mapping; |
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| 261 | mapping[ handler_decl ] = local_except; |
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| 262 | VarExprReplacer mapper( mapping ); |
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| 263 | handler->get_body()->accept( mapper ); |
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| 264 | } |
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| 265 | |
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| 266 | block->push_back( handler->get_body() ); |
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[288eede] | 267 | handler->set_body( nullptr ); |
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| 268 | |
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[86d5ba7c] | 269 | std::list<Statement *> caseBody |
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| 270 | { block, new ReturnStmt( noLabels, nullptr ) }; |
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[288eede] | 271 | handler_wrappers.push_back( new CaseStmt( |
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[ba912706] | 272 | noLabels, |
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| 273 | new ConstantExpr( Constant::from_int( index ) ), |
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[288eede] | 274 | caseBody |
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| 275 | ) ); |
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[ba912706] | 276 | } |
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| 277 | // TODO: Some sort of meaningful error on default perhaps? |
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| 278 | |
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[288eede] | 279 | std::list<Statement*> stmt_handlers; |
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| 280 | while ( !handler_wrappers.empty() ) { |
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| 281 | stmt_handlers.push_back( handler_wrappers.front() ); |
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| 282 | handler_wrappers.pop_front(); |
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| 283 | } |
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| 284 | |
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[ba912706] | 285 | SwitchStmt * handler_lookup = new SwitchStmt( |
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| 286 | noLabels, |
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[288eede] | 287 | nameOf( index_obj ), |
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| 288 | stmt_handlers |
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[ba912706] | 289 | ); |
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| 290 | CompoundStmt * body = new CompoundStmt( noLabels ); |
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| 291 | body->push_back( handler_lookup ); |
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| 292 | |
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| 293 | return new FunctionDecl("catch", Type::StorageClasses(), |
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[288eede] | 294 | LinkageSpec::Cforall, func_type, body); |
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[ba912706] | 295 | } |
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| 296 | |
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| 297 | // Create a single check from a moddified handler. |
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[288eede] | 298 | // except_obj is referenced, modded_handler will be freed. |
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| 299 | CompoundStmt *create_single_matcher( |
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| 300 | DeclarationWithType * except_obj, CatchStmt * modded_handler ) { |
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| 301 | CompoundStmt * block = new CompoundStmt( noLabels ); |
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| 302 | |
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[86d5ba7c] | 303 | ObjectDecl * local_except = |
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| 304 | dynamic_cast<ObjectDecl *>( modded_handler->get_decl() ); |
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| 305 | assert( local_except ); |
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| 306 | block->push_back( new DeclStmt( noLabels, local_except ) ); |
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| 307 | #if 0 |
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| 308 | // Virtual Exception Version |
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| 309 | // { |
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| 310 | // `modded_handler.decl` |
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| 311 | // if ( `decl.name = (virtual)`except` |
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| 312 | // [&& `modded_handler.cond`] ) { |
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| 313 | // `modded_handler.body` |
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| 314 | // } |
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| 315 | // } |
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| 316 | |
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| 317 | // Check for type match. |
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| 318 | Expression * cond = UntypedExpr::createAssign( nameOf( local_except ), |
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| 319 | new VirtualCastExpr( nameOf( except_obj ), |
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| 320 | local_except->get_type()->clone() ) ); |
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| 321 | #endif |
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| 322 | |
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[288eede] | 323 | // INTEGERconstant Version |
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[86d5ba7c] | 324 | // { |
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| 325 | // `modded_handler.decl` = *`except` |
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| 326 | // if ( `decl.name` == `modded_handler.cond` ) { |
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| 327 | // `modded_handler.body` |
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| 328 | // } |
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| 329 | // } |
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[288eede] | 330 | ConstantExpr * number = |
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| 331 | dynamic_cast<ConstantExpr*>( modded_handler->get_cond() ); |
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| 332 | assert( number ); |
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| 333 | modded_handler->set_cond( nullptr ); |
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[ba912706] | 334 | |
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[288eede] | 335 | Expression * cond; |
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| 336 | { |
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| 337 | std::list<Expression *> args; |
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| 338 | args.push_back( number ); |
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[307a732] | 339 | |
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| 340 | std::list<Expression *> rhs_args; |
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| 341 | rhs_args.push_back( nameOf( except_obj ) ); |
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| 342 | Expression * rhs = new UntypedExpr( |
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| 343 | new NameExpr( "*?" ), rhs_args ); |
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| 344 | args.push_back( rhs ); |
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| 345 | |
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[288eede] | 346 | cond = new UntypedExpr( new NameExpr( "?==?" /*???*/), args ); |
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| 347 | } |
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[ba912706] | 348 | |
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[86d5ba7c] | 349 | // Add the check on the conditional if it is provided. |
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[ba912706] | 350 | if ( modded_handler->get_cond() ) { |
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[288eede] | 351 | cond = new LogicalExpr( cond, modded_handler->get_cond() ); |
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[ba912706] | 352 | } |
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[86d5ba7c] | 353 | // Construct the match condition. |
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[ba912706] | 354 | block->push_back( new IfStmt( noLabels, |
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[288eede] | 355 | cond, modded_handler->get_body(), nullptr ) ); |
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[ba912706] | 356 | |
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| 357 | modded_handler->set_decl( nullptr ); |
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| 358 | modded_handler->set_cond( nullptr ); |
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| 359 | modded_handler->set_body( nullptr ); |
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| 360 | delete modded_handler; |
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| 361 | return block; |
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| 362 | } |
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| 363 | |
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| 364 | FunctionDecl * create_terminate_match( CatchList &handlers ) { |
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[86d5ba7c] | 365 | // int match(exception * except) { |
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| 366 | // HANDLER WRAPPERS { return `index`; } |
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| 367 | // } |
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| 368 | |
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[ba912706] | 369 | CompoundStmt * body = new CompoundStmt( noLabels ); |
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| 370 | |
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[288eede] | 371 | FunctionType * func_type = match_func_t.clone(); |
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| 372 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
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| 373 | |
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[ba912706] | 374 | // Index 1..{number of handlers} |
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| 375 | int index = 0; |
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| 376 | CatchList::iterator it; |
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| 377 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) { |
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| 378 | ++index; |
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| 379 | CatchStmt * handler = *it; |
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| 380 | |
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[288eede] | 381 | // Body should have been taken by create_terminate_catch. |
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| 382 | assert( nullptr == handler->get_body() ); |
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| 383 | |
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| 384 | // Create new body. |
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[ba912706] | 385 | handler->set_body( new ReturnStmt( noLabels, |
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| 386 | new ConstantExpr( Constant::from_int( index ) ) ) ); |
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| 387 | |
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[288eede] | 388 | // Create the handler. |
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| 389 | body->push_back( create_single_matcher( except_obj, handler ) ); |
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| 390 | *it = nullptr; |
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[ba912706] | 391 | } |
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| 392 | |
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[307a732] | 393 | body->push_back( new ReturnStmt( noLabels, new ConstantExpr( |
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| 394 | Constant::from_int( 0 ) ) ) ); |
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| 395 | |
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[ba912706] | 396 | return new FunctionDecl("match", Type::StorageClasses(), |
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[288eede] | 397 | LinkageSpec::Cforall, func_type, body); |
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[ba912706] | 398 | } |
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| 399 | |
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[288eede] | 400 | CompoundStmt * create_terminate_caller( |
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[ba912706] | 401 | FunctionDecl * try_wrapper, |
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| 402 | FunctionDecl * terminate_catch, |
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| 403 | FunctionDecl * terminate_match) { |
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[86d5ba7c] | 404 | // { __cfaehm__try_terminate(`try`, `catch`, `match`); } |
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[ba912706] | 405 | |
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[288eede] | 406 | UntypedExpr * caller = new UntypedExpr( new NameExpr( |
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| 407 | "__cfaehm__try_terminate" ) ); |
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| 408 | std::list<Expression *>& args = caller->get_args(); |
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[ba912706] | 409 | args.push_back( nameOf( try_wrapper ) ); |
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| 410 | args.push_back( nameOf( terminate_catch ) ); |
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| 411 | args.push_back( nameOf( terminate_match ) ); |
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| 412 | |
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[288eede] | 413 | CompoundStmt * callStmt = new CompoundStmt( noLabels ); |
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| 414 | callStmt->push_back( new ExprStmt( noLabels, caller ) ); |
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| 415 | return callStmt; |
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[ba912706] | 416 | } |
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| 417 | |
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| 418 | FunctionDecl * create_resume_handler( CatchList &handlers ) { |
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[86d5ba7c] | 419 | // bool handle(exception * except) { |
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| 420 | // HANDLER WRAPPERS { `hander->body`; return true; } |
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| 421 | // } |
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[288eede] | 422 | CompoundStmt * body = new CompoundStmt( noLabels ); |
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| 423 | |
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| 424 | FunctionType * func_type = match_func_t.clone(); |
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| 425 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
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[ba912706] | 426 | |
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| 427 | CatchList::iterator it; |
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| 428 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) { |
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| 429 | CatchStmt * handler = *it; |
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| 430 | |
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| 431 | // Modifiy body. |
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| 432 | CompoundStmt * handling_code = |
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| 433 | dynamic_cast<CompoundStmt*>( handler->get_body() ); |
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| 434 | if ( ! handling_code ) { |
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| 435 | handling_code = new CompoundStmt( noLabels ); |
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| 436 | handling_code->push_back( handler->get_body() ); |
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| 437 | } |
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[288eede] | 438 | handling_code->push_back( new ReturnStmt( noLabels, |
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[ad0be81] | 439 | new ConstantExpr( Constant::from_bool( true ) ) ) ); |
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[ba912706] | 440 | handler->set_body( handling_code ); |
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| 441 | |
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| 442 | // Create the handler. |
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[288eede] | 443 | body->push_back( create_single_matcher( except_obj, handler ) ); |
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| 444 | *it = nullptr; |
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[ba912706] | 445 | } |
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| 446 | |
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[ad0be81] | 447 | body->push_back( new ReturnStmt( noLabels, new ConstantExpr( |
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| 448 | Constant::from_bool( false ) ) ) ); |
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| 449 | |
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[ba912706] | 450 | return new FunctionDecl("handle", Type::StorageClasses(), |
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[288eede] | 451 | LinkageSpec::Cforall, func_type, body); |
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[ba912706] | 452 | } |
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| 453 | |
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[288eede] | 454 | CompoundStmt * create_resume_wrapper( |
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| 455 | StructDecl * node_decl, |
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[ba912706] | 456 | Statement * wraps, |
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| 457 | FunctionDecl * resume_handler ) { |
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| 458 | CompoundStmt * body = new CompoundStmt( noLabels ); |
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| 459 | |
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[288eede] | 460 | // struct __try_resume_node __resume_node |
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| 461 | // __attribute__((cleanup( __cfaehm__try_resume_cleanup ))); |
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| 462 | // ** unwinding of the stack here could cause problems ** |
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| 463 | // ** however I don't think that can happen currently ** |
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| 464 | // __cfaehm__try_resume_setup( &__resume_node, resume_handler ); |
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[ba912706] | 465 | |
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| 466 | std::list< Attribute * > attributes; |
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| 467 | { |
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| 468 | std::list< Expression * > attr_params; |
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[288eede] | 469 | attr_params.push_back( new NameExpr( |
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| 470 | "__cfaehm__try_resume_cleanup" ) ); |
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| 471 | attributes.push_back( new Attribute( "cleanup", attr_params ) ); |
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[ba912706] | 472 | } |
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| 473 | |
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[288eede] | 474 | ObjectDecl * obj = new ObjectDecl( |
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| 475 | "__resume_node", |
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[ba912706] | 476 | Type::StorageClasses(), |
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| 477 | LinkageSpec::Cforall, |
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| 478 | nullptr, |
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[288eede] | 479 | new StructInstType( |
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| 480 | Type::Qualifiers(), |
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| 481 | node_decl |
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| 482 | ), |
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| 483 | nullptr, |
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[ba912706] | 484 | attributes |
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[288eede] | 485 | ); |
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| 486 | appendDeclStmt( body, obj ); |
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| 487 | |
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| 488 | UntypedExpr *setup = new UntypedExpr( new NameExpr( |
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| 489 | "__cfaehm__try_resume_setup" ) ); |
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[307a732] | 490 | setup->get_args().push_back( new AddressExpr( nameOf( obj ) ) ); |
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[288eede] | 491 | setup->get_args().push_back( nameOf( resume_handler ) ); |
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| 492 | |
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| 493 | body->push_back( new ExprStmt( noLabels, setup ) ); |
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| 494 | |
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[ba912706] | 495 | body->push_back( wraps ); |
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| 496 | return body; |
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| 497 | } |
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| 498 | |
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| 499 | FunctionDecl * create_finally_wrapper( TryStmt * tryStmt ) { |
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[86d5ba7c] | 500 | // void finally() { <finally code> } |
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[288eede] | 501 | FinallyStmt * finally = tryStmt->get_finally(); |
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| 502 | CompoundStmt * body = finally->get_block(); |
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| 503 | finally->set_block( nullptr ); |
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| 504 | delete finally; |
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[ba912706] | 505 | tryStmt->set_finally( nullptr ); |
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| 506 | |
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| 507 | return new FunctionDecl("finally", Type::StorageClasses(), |
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[307a732] | 508 | LinkageSpec::Cforall, finally_func_t.clone(), body); |
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[ba912706] | 509 | } |
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| 510 | |
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[288eede] | 511 | ObjectDecl * create_finally_hook( |
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| 512 | StructDecl * hook_decl, FunctionDecl * finally_wrapper ) { |
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| 513 | // struct __cfaehm__cleanup_hook __finally_hook |
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| 514 | // __attribute__((cleanup( finally_wrapper ))); |
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[ba912706] | 515 | |
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| 516 | // Make Cleanup Attribute. |
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| 517 | std::list< Attribute * > attributes; |
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| 518 | { |
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| 519 | std::list< Expression * > attr_params; |
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| 520 | attr_params.push_back( nameOf( finally_wrapper ) ); |
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[288eede] | 521 | attributes.push_back( new Attribute( "cleanup", attr_params ) ); |
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[ba912706] | 522 | } |
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| 523 | |
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[288eede] | 524 | return new ObjectDecl( |
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| 525 | "__finally_hook", |
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[ba912706] | 526 | Type::StorageClasses(), |
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| 527 | LinkageSpec::Cforall, |
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| 528 | nullptr, |
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[288eede] | 529 | new StructInstType( |
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[ac10576] | 530 | noQualifiers, |
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[288eede] | 531 | hook_decl |
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| 532 | ), |
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[ba912706] | 533 | nullptr, |
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| 534 | attributes |
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| 535 | ); |
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| 536 | } |
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| 537 | |
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| 538 | |
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[1abc5ab] | 539 | class ExceptionMutatorCore : public WithGuards { |
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[ba912706] | 540 | enum Context { NoHandler, TerHandler, ResHandler }; |
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| 541 | |
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| 542 | // Also need to handle goto, break & continue. |
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| 543 | // They need to be cut off in a ResHandler, until we enter another |
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| 544 | // loop, switch or the goto stays within the function. |
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| 545 | |
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[288eede] | 546 | Context cur_context; |
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[ba912706] | 547 | |
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[86d5ba7c] | 548 | // The current (innermost) termination handler exception declaration. |
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| 549 | ObjectDecl * handler_except_decl; |
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| 550 | |
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[ba912706] | 551 | // We might not need this, but a unique base for each try block's |
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| 552 | // generated functions might be nice. |
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| 553 | //std::string curFunctionName; |
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| 554 | //unsigned int try_count = 0; |
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| 555 | |
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[288eede] | 556 | StructDecl *node_decl; |
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| 557 | StructDecl *hook_decl; |
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[ba912706] | 558 | |
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| 559 | public: |
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| 560 | ExceptionMutatorCore() : |
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[288eede] | 561 | cur_context(NoHandler), |
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[86d5ba7c] | 562 | handler_except_decl( nullptr ), |
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| 563 | node_decl( nullptr ), hook_decl( nullptr ) |
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[ba912706] | 564 | {} |
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| 565 | |
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[288eede] | 566 | void premutate( CatchStmt *catchStmt ); |
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| 567 | void premutate( StructDecl *structDecl ); |
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[ba912706] | 568 | Statement * postmutate( ThrowStmt *throwStmt ); |
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| 569 | Statement * postmutate( TryStmt *tryStmt ); |
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| 570 | }; |
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| 571 | |
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[86d5ba7c] | 572 | void ExceptionMutatorCore::premutate( CatchStmt *catchStmt ) { |
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| 573 | // Currently, we make up the declaration, as there isn't one for |
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| 574 | // integers. |
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| 575 | ObjectDecl * tmp = new ObjectDecl( |
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| 576 | "_hidden_local", |
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| 577 | Type::StorageClasses(), |
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| 578 | LinkageSpec::Cforall, |
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| 579 | nullptr, |
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| 580 | new PointerType( |
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| 581 | noQualifiers, |
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| 582 | new BasicType( noQualifiers, BasicType::SignedInt ) |
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| 583 | ), |
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| 584 | nullptr |
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| 585 | ); |
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| 586 | catchStmt->set_decl( tmp ); |
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| 587 | |
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[03eedd5] | 588 | // Validate the Statement's form. |
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| 589 | ObjectDecl * decl = |
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| 590 | dynamic_cast<ObjectDecl *>( catchStmt->get_decl() ); |
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| 591 | if ( decl && true /* check decl->get_type() */ ) { |
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| 592 | // Pass. |
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| 593 | } else if ( CatchStmt::Terminate == catchStmt->get_kind() ) { |
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| 594 | throw SemanticError("catch must have exception type"); |
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| 595 | } else { |
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| 596 | throw SemanticError("catchResume must have exception type"); |
---|
| 597 | } |
---|
| 598 | |
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| 599 | // Track the handler context. |
---|
[86d5ba7c] | 600 | GuardValue( cur_context ); |
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| 601 | if ( CatchStmt::Terminate == catchStmt->get_kind() ) { |
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| 602 | cur_context = TerHandler; |
---|
| 603 | |
---|
| 604 | GuardValue( handler_except_decl ); |
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[03eedd5] | 605 | handler_except_decl = decl; |
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[86d5ba7c] | 606 | } else { |
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| 607 | cur_context = ResHandler; |
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| 608 | } |
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| 609 | } |
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| 610 | |
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| 611 | void ExceptionMutatorCore::premutate( StructDecl *structDecl ) { |
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| 612 | if ( !structDecl->has_body() ) { |
---|
| 613 | // Skip children? |
---|
| 614 | return; |
---|
| 615 | } else if ( structDecl->get_name() == "__cfaehm__try_resume_node" ) { |
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| 616 | assert( nullptr == node_decl ); |
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| 617 | node_decl = structDecl; |
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| 618 | } else if ( structDecl->get_name() == "__cfaehm__cleanup_hook" ) { |
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| 619 | assert( nullptr == hook_decl ); |
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| 620 | hook_decl = structDecl; |
---|
| 621 | } |
---|
| 622 | // Later we might get the exception type as well. |
---|
| 623 | } |
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| 624 | |
---|
[ba912706] | 625 | Statement * ExceptionMutatorCore::postmutate( ThrowStmt *throwStmt ) { |
---|
| 626 | // Ignoring throwStmt->get_target() for now. |
---|
| 627 | if ( ThrowStmt::Terminate == throwStmt->get_kind() ) { |
---|
| 628 | if ( throwStmt->get_expr() ) { |
---|
| 629 | return create_terminate_throw( throwStmt ); |
---|
[288eede] | 630 | } else if ( TerHandler == cur_context ) { |
---|
[86d5ba7c] | 631 | return create_terminate_rethrow( |
---|
| 632 | throwStmt, handler_except_decl ); |
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[ba912706] | 633 | } else { |
---|
| 634 | assertf(false, "Invalid throw in %s at %i\n", |
---|
[288eede] | 635 | throwStmt->location.filename.c_str(), |
---|
[ba912706] | 636 | throwStmt->location.linenumber); |
---|
| 637 | return nullptr; |
---|
| 638 | } |
---|
| 639 | } else { |
---|
| 640 | if ( throwStmt->get_expr() ) { |
---|
| 641 | return create_resume_throw( throwStmt ); |
---|
[288eede] | 642 | } else if ( ResHandler == cur_context ) { |
---|
[ba912706] | 643 | return create_resume_rethrow( throwStmt ); |
---|
| 644 | } else { |
---|
| 645 | assertf(false, "Invalid throwResume in %s at %i\n", |
---|
[288eede] | 646 | throwStmt->location.filename.c_str(), |
---|
[ba912706] | 647 | throwStmt->location.linenumber); |
---|
| 648 | return nullptr; |
---|
| 649 | } |
---|
| 650 | } |
---|
| 651 | } |
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| 652 | |
---|
| 653 | Statement * ExceptionMutatorCore::postmutate( TryStmt *tryStmt ) { |
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[288eede] | 654 | assert( node_decl ); |
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| 655 | assert( hook_decl ); |
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| 656 | |
---|
[ba912706] | 657 | // Generate a prefix for the function names? |
---|
| 658 | |
---|
[288eede] | 659 | CompoundStmt * block = new CompoundStmt( noLabels ); |
---|
| 660 | CompoundStmt * inner = take_try_block( tryStmt ); |
---|
[ba912706] | 661 | |
---|
| 662 | if ( tryStmt->get_finally() ) { |
---|
| 663 | // Define the helper function. |
---|
| 664 | FunctionDecl * finally_block = |
---|
| 665 | create_finally_wrapper( tryStmt ); |
---|
| 666 | appendDeclStmt( block, finally_block ); |
---|
| 667 | // Create and add the finally cleanup hook. |
---|
[288eede] | 668 | appendDeclStmt( block, |
---|
| 669 | create_finally_hook( hook_decl, finally_block ) ); |
---|
[ba912706] | 670 | } |
---|
| 671 | |
---|
[288eede] | 672 | CatchList termination_handlers; |
---|
| 673 | CatchList resumption_handlers; |
---|
| 674 | split( tryStmt->get_catchers(), |
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[1abc5ab] | 675 | termination_handlers, resumption_handlers ); |
---|
[ba912706] | 676 | |
---|
[288eede] | 677 | if ( resumption_handlers.size() ) { |
---|
[ba912706] | 678 | // Define the helper function. |
---|
| 679 | FunctionDecl * resume_handler = |
---|
| 680 | create_resume_handler( resumption_handlers ); |
---|
| 681 | appendDeclStmt( block, resume_handler ); |
---|
| 682 | // Prepare hooks |
---|
[288eede] | 683 | inner = create_resume_wrapper( node_decl, inner, resume_handler ); |
---|
[ba912706] | 684 | } |
---|
| 685 | |
---|
| 686 | if ( termination_handlers.size() ) { |
---|
| 687 | // Define the three helper functions. |
---|
| 688 | FunctionDecl * try_wrapper = create_try_wrapper( inner ); |
---|
| 689 | appendDeclStmt( block, try_wrapper ); |
---|
| 690 | FunctionDecl * terminate_catch = |
---|
| 691 | create_terminate_catch( termination_handlers ); |
---|
| 692 | appendDeclStmt( block, terminate_catch ); |
---|
| 693 | FunctionDecl * terminate_match = |
---|
| 694 | create_terminate_match( termination_handlers ); |
---|
| 695 | appendDeclStmt( block, terminate_match ); |
---|
| 696 | // Build the call to the try wrapper. |
---|
| 697 | inner = create_terminate_caller( |
---|
| 698 | try_wrapper, terminate_catch, terminate_match ); |
---|
| 699 | } |
---|
| 700 | |
---|
| 701 | // Embed the try block. |
---|
| 702 | block->push_back( inner ); |
---|
| 703 | |
---|
| 704 | return block; |
---|
| 705 | } |
---|
| 706 | |
---|
[1abc5ab] | 707 | void translateEHM( std::list< Declaration *> & translationUnit ) { |
---|
[288eede] | 708 | init_func_types(); |
---|
| 709 | |
---|
[ba912706] | 710 | PassVisitor<ExceptionMutatorCore> translator; |
---|
[6fca7ea] | 711 | mutateAll( translationUnit, translator ); |
---|
[ba912706] | 712 | } |
---|
| 713 | } |
---|