[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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[cbce272] | 12 | // Last Modified On : Tus Aug 8 16:54:00 2017
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[948b0c8] | 13 | // Update Count : 7
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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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[948b0c8] | 27 | // Buricratic Helpers (Not having to do with the paritular operation.)
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| 28 |
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| 29 | typedef std::list<CatchStmt*> CatchList;
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| 30 |
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| 31 | void split( CatchList& allHandlers, CatchList& terHandlers,
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| 32 | CatchList& resHandlers ) {
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| 33 | while ( !allHandlers.empty() ) {
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| 34 | CatchStmt * stmt = allHandlers.front();
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| 35 | allHandlers.pop_front();
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| 36 | if (CatchStmt::Terminate == stmt->get_kind()) {
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| 37 | terHandlers.push_back(stmt);
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| 38 | } else {
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| 39 | resHandlers.push_back(stmt);
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| 40 | }
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| 41 | }
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| 42 | }
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| 43 |
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| 44 | void appendDeclStmt( CompoundStmt * block, Declaration * item ) {
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| 45 | block->push_back(new DeclStmt(noLabels, item));
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| 46 | }
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| 47 |
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| 48 | Expression * nameOf( DeclarationWithType * decl ) {
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| 49 | return new VariableExpr( decl );
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| 50 | }
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| 51 |
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| 52 | class ExceptionMutatorCore : public WithGuards {
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| 53 | enum Context { NoHandler, TerHandler, ResHandler };
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| 54 |
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| 55 | // Also need to handle goto, break & continue.
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| 56 | // They need to be cut off in a ResHandler, until we enter another
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| 57 | // loop, switch or the goto stays within the function.
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| 58 |
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| 59 | Context cur_context;
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| 60 |
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| 61 | // The current (innermost) termination handler exception declaration.
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| 62 | ObjectDecl * handler_except_decl;
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| 63 |
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| 64 | // The built in types used in translation.
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| 65 | StructDecl * except_decl;
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| 66 | StructDecl * node_decl;
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| 67 | StructDecl * hook_decl;
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| 68 |
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| 69 | // The many helper functions for code/syntree generation.
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| 70 | Statement * create_given_throw(
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| 71 | const char * throwFunc, ThrowStmt * throwStmt );
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| 72 | Statement * create_terminate_throw( ThrowStmt * throwStmt );
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| 73 | Statement * create_terminate_rethrow( ThrowStmt * throwStmt );
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| 74 | Statement * create_resume_throw( ThrowStmt * throwStmt );
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| 75 | Statement * create_resume_rethrow( ThrowStmt * throwStmt );
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| 76 | CompoundStmt * take_try_block( TryStmt * tryStmt );
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| 77 | FunctionDecl * create_try_wrapper( CompoundStmt * body );
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| 78 | FunctionDecl * create_terminate_catch( CatchList &handlers );
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| 79 | CompoundStmt * create_single_matcher(
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| 80 | DeclarationWithType * except_obj, CatchStmt * modded_handler );
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| 81 | FunctionDecl * create_terminate_match( CatchList &handlers );
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| 82 | CompoundStmt * create_terminate_caller( FunctionDecl * try_wrapper,
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| 83 | FunctionDecl * terminate_catch, FunctionDecl * terminate_match );
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| 84 | FunctionDecl * create_resume_handler( CatchList &handlers );
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| 85 | CompoundStmt * create_resume_wrapper(
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| 86 | Statement * wraps, FunctionDecl * resume_handler );
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| 87 | FunctionDecl * create_finally_wrapper( TryStmt * tryStmt );
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| 88 | ObjectDecl * create_finally_hook( FunctionDecl * finally_wrapper );
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| 89 |
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| 90 | // Types used in translation, make sure to use clone.
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| 91 | // void (*function)();
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| 92 | FunctionType try_func_t;
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| 93 | // void (*function)(int, exception);
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| 94 | FunctionType catch_func_t;
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| 95 | // int (*function)(exception);
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| 96 | FunctionType match_func_t;
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| 97 | // bool (*function)(exception);
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| 98 | FunctionType handle_func_t;
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| 99 | // void (*function)(__attribute__((unused)) void *);
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| 100 | FunctionType finally_func_t;
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| 101 |
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| 102 | StructInstType * create_except_type() {
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| 103 | assert( except_decl );
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| 104 | return new StructInstType( noQualifiers, except_decl );
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| 105 | }
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| 106 | void init_func_types();
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| 107 |
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| 108 | public:
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| 109 | ExceptionMutatorCore() :
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| 110 | cur_context( NoHandler ),
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| 111 | handler_except_decl( nullptr ),
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| 112 | except_decl( nullptr ), node_decl( nullptr ), hook_decl( nullptr ),
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| 113 | try_func_t( noQualifiers, false ),
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| 114 | catch_func_t( noQualifiers, false ),
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| 115 | match_func_t( noQualifiers, false ),
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| 116 | handle_func_t( noQualifiers, false ),
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| 117 | finally_func_t( noQualifiers, false )
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[cbce272] | 118 | {}
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[948b0c8] | 119 |
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| 120 | void premutate( CatchStmt *catchStmt );
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| 121 | void premutate( StructDecl *structDecl );
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| 122 | Statement * postmutate( ThrowStmt *throwStmt );
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| 123 | Statement * postmutate( TryStmt *tryStmt );
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| 124 | };
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| 125 |
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| 126 | void ExceptionMutatorCore::init_func_types() {
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[cbce272] | 127 | assert( except_decl );
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| 128 |
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[ba912706] | 129 | ObjectDecl index_obj(
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[288eede] | 130 | "__handler_index",
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[ba912706] | 131 | Type::StorageClasses(),
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| 132 | LinkageSpec::Cforall,
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| 133 | /*bitfieldWidth*/ NULL,
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[ac10576] | 134 | new BasicType( noQualifiers, BasicType::SignedInt ),
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[ba912706] | 135 | /*init*/ NULL
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[307a732] | 136 | );
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[ba912706] | 137 | ObjectDecl exception_obj(
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[288eede] | 138 | "__exception_inst",
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[ba912706] | 139 | Type::StorageClasses(),
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| 140 | LinkageSpec::Cforall,
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| 141 | /*bitfieldWidth*/ NULL,
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[307a732] | 142 | new PointerType(
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[ac10576] | 143 | noQualifiers,
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[cbce272] | 144 | new StructInstType( noQualifiers, except_decl )
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[307a732] | 145 | ),
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[ba912706] | 146 | /*init*/ NULL
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[307a732] | 147 | );
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[ba912706] | 148 | ObjectDecl bool_obj(
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[288eede] | 149 | "__ret_bool",
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[ba912706] | 150 | Type::StorageClasses(),
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| 151 | LinkageSpec::Cforall,
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| 152 | /*bitfieldWidth*/ NULL,
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[948b0c8] | 153 | new BasicType( noQualifiers, BasicType::Bool ),
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[ba912706] | 154 | /*init*/ NULL
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[307a732] | 155 | );
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| 156 | ObjectDecl voidptr_obj(
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| 157 | "__hook",
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| 158 | Type::StorageClasses(),
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| 159 | LinkageSpec::Cforall,
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| 160 | NULL,
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| 161 | new PointerType(
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[ac10576] | 162 | noQualifiers,
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[307a732] | 163 | new VoidType(
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[ac10576] | 164 | noQualifiers
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[307a732] | 165 | ),
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[948b0c8] | 166 | std::list<Attribute *>{ new Attribute( "unused" ) }
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[307a732] | 167 | ),
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| 168 | NULL
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| 169 | );
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[ba912706] | 170 |
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[307a732] | 171 | catch_func_t.get_parameters().push_back( index_obj.clone() );
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| 172 | catch_func_t.get_parameters().push_back( exception_obj.clone() );
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| 173 | match_func_t.get_returnVals().push_back( index_obj.clone() );
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| 174 | match_func_t.get_parameters().push_back( exception_obj.clone() );
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| 175 | handle_func_t.get_returnVals().push_back( bool_obj.clone() );
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| 176 | handle_func_t.get_parameters().push_back( exception_obj.clone() );
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| 177 | finally_func_t.get_parameters().push_back( voidptr_obj.clone() );
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[ba912706] | 178 | }
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| 179 |
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| 180 | // ThrowStmt Mutation Helpers
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| 181 |
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[948b0c8] | 182 | Statement * ExceptionMutatorCore::create_given_throw(
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[307a732] | 183 | const char * throwFunc, ThrowStmt * throwStmt ) {
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[cbce272] | 184 | // `throwFunc`( `throwStmt->get_name` );
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[307a732] | 185 | UntypedExpr * call = new UntypedExpr( new NameExpr( throwFunc ) );
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[cbce272] | 186 | call->get_args().push_back( throwStmt->get_expr() );
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[ba912706] | 187 | throwStmt->set_expr( nullptr );
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| 188 | delete throwStmt;
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[cbce272] | 189 | return new ExprStmt( noLabels, call );
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[ba912706] | 190 | }
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[307a732] | 191 |
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[948b0c8] | 192 | Statement * ExceptionMutatorCore::create_terminate_throw(
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| 193 | ThrowStmt *throwStmt ) {
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[cbce272] | 194 | // __throw_terminate( `throwStmt->get_name()` ); }
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[38ac6ec] | 195 | return create_given_throw( "__cfaehm__throw_terminate", throwStmt );
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[307a732] | 196 | }
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[86d5ba7c] | 197 |
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[948b0c8] | 198 | Statement * ExceptionMutatorCore::create_terminate_rethrow(
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| 199 | ThrowStmt *throwStmt ) {
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[86d5ba7c] | 200 | // { `handler_except_decl` = NULL; __rethrow_terminate(); }
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[288eede] | 201 | assert( nullptr == throwStmt->get_expr() );
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[86d5ba7c] | 202 | assert( handler_except_decl );
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| 203 |
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| 204 | CompoundStmt * result = new CompoundStmt( throwStmt->get_labels() );
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| 205 | result->push_back( new ExprStmt( noLabels, UntypedExpr::createAssign(
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| 206 | nameOf( handler_except_decl ),
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| 207 | new ConstantExpr( Constant::null(
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| 208 | new PointerType(
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| 209 | noQualifiers,
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| 210 | handler_except_decl->get_type()->clone()
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| 211 | )
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| 212 | ) )
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| 213 | ) ) );
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| 214 | result->push_back( new ExprStmt(
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| 215 | noLabels,
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[38ac6ec] | 216 | new UntypedExpr( new NameExpr( "__cfaehm__rethrow_terminate" ) )
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[86d5ba7c] | 217 | ) );
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[ba912706] | 218 | delete throwStmt;
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| 219 | return result;
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| 220 | }
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[86d5ba7c] | 221 |
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[948b0c8] | 222 | Statement * ExceptionMutatorCore::create_resume_throw(
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| 223 | ThrowStmt *throwStmt ) {
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[cbce272] | 224 | // __throw_resume( `throwStmt->get_name` );
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[38ac6ec] | 225 | return create_given_throw( "__cfaehm__throw_resume", throwStmt );
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[ba912706] | 226 | }
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[86d5ba7c] | 227 |
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[948b0c8] | 228 | Statement * ExceptionMutatorCore::create_resume_rethrow(
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| 229 | ThrowStmt *throwStmt ) {
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[ba912706] | 230 | // return false;
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| 231 | Statement * result = new ReturnStmt(
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| 232 | throwStmt->get_labels(),
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[288eede] | 233 | new ConstantExpr( Constant::from_bool( false ) )
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[ba912706] | 234 | );
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| 235 | delete throwStmt;
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| 236 | return result;
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| 237 | }
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| 238 |
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| 239 | // TryStmt Mutation Helpers
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| 240 |
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[948b0c8] | 241 | CompoundStmt * ExceptionMutatorCore::take_try_block( TryStmt *tryStmt ) {
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[ba912706] | 242 | CompoundStmt * block = tryStmt->get_block();
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| 243 | tryStmt->set_block( nullptr );
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| 244 | return block;
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| 245 | }
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[948b0c8] | 246 |
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| 247 | FunctionDecl * ExceptionMutatorCore::create_try_wrapper(
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| 248 | CompoundStmt *body ) {
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[ba912706] | 249 |
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[288eede] | 250 | return new FunctionDecl( "try", Type::StorageClasses(),
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[307a732] | 251 | LinkageSpec::Cforall, try_func_t.clone(), body );
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[ba912706] | 252 | }
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| 253 |
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[948b0c8] | 254 | FunctionDecl * ExceptionMutatorCore::create_terminate_catch(
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| 255 | CatchList &handlers ) {
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[ba912706] | 256 | std::list<CaseStmt *> handler_wrappers;
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| 257 |
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[288eede] | 258 | FunctionType *func_type = catch_func_t.clone();
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| 259 | DeclarationWithType * index_obj = func_type->get_parameters().front();
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[86d5ba7c] | 260 | DeclarationWithType * except_obj = func_type->get_parameters().back();
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[288eede] | 261 |
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[ba912706] | 262 | // Index 1..{number of handlers}
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| 263 | int index = 0;
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| 264 | CatchList::iterator it = handlers.begin();
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| 265 | for ( ; it != handlers.end() ; ++it ) {
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| 266 | ++index;
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| 267 | CatchStmt * handler = *it;
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| 268 |
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[288eede] | 269 | // case `index`:
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| 270 | // {
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[cbce272] | 271 | // `handler.decl` = { (virtual `decl.type`)`except` };
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| 272 | // `handler.body`;
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[288eede] | 273 | // }
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| 274 | // return;
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[86d5ba7c] | 275 | CompoundStmt * block = new CompoundStmt( noLabels );
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| 276 |
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[03eedd5] | 277 | // Just copy the exception value. (Post Validation)
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[86d5ba7c] | 278 | ObjectDecl * handler_decl =
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[03eedd5] | 279 | static_cast<ObjectDecl *>( handler->get_decl() );
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[86d5ba7c] | 280 | ObjectDecl * local_except = handler_decl->clone();
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[03eedd5] | 281 | local_except->set_init(
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[86d5ba7c] | 282 | new ListInit({ new SingleInit(
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| 283 | new VirtualCastExpr( nameOf( except_obj ),
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| 284 | local_except->get_type()
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| 285 | )
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[03eedd5] | 286 | ) })
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| 287 | );
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[86d5ba7c] | 288 | block->push_back( new DeclStmt( noLabels, local_except ) );
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| 289 |
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| 290 | // Add the cleanup attribute.
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| 291 | local_except->get_attributes().push_back( new Attribute(
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| 292 | "cleanup",
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| 293 | { new NameExpr( "__cfaehm__cleanup_terminate" ) }
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| 294 | ) );
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| 295 |
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| 296 | // Update variables in the body to point to this local copy.
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| 297 | {
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| 298 | VarExprReplacer::DeclMap mapping;
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| 299 | mapping[ handler_decl ] = local_except;
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| 300 | VarExprReplacer mapper( mapping );
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| 301 | handler->get_body()->accept( mapper );
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| 302 | }
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| 303 |
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| 304 | block->push_back( handler->get_body() );
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[288eede] | 305 | handler->set_body( nullptr );
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| 306 |
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[86d5ba7c] | 307 | std::list<Statement *> caseBody
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| 308 | { block, new ReturnStmt( noLabels, nullptr ) };
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[288eede] | 309 | handler_wrappers.push_back( new CaseStmt(
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[ba912706] | 310 | noLabels,
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| 311 | new ConstantExpr( Constant::from_int( index ) ),
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[288eede] | 312 | caseBody
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| 313 | ) );
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[ba912706] | 314 | }
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| 315 | // TODO: Some sort of meaningful error on default perhaps?
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| 316 |
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[288eede] | 317 | std::list<Statement*> stmt_handlers;
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| 318 | while ( !handler_wrappers.empty() ) {
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| 319 | stmt_handlers.push_back( handler_wrappers.front() );
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| 320 | handler_wrappers.pop_front();
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| 321 | }
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| 322 |
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[ba912706] | 323 | SwitchStmt * handler_lookup = new SwitchStmt(
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| 324 | noLabels,
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[288eede] | 325 | nameOf( index_obj ),
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| 326 | stmt_handlers
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[ba912706] | 327 | );
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| 328 | CompoundStmt * body = new CompoundStmt( noLabels );
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| 329 | body->push_back( handler_lookup );
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| 330 |
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| 331 | return new FunctionDecl("catch", Type::StorageClasses(),
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[288eede] | 332 | LinkageSpec::Cforall, func_type, body);
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[ba912706] | 333 | }
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| 334 |
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| 335 | // Create a single check from a moddified handler.
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[288eede] | 336 | // except_obj is referenced, modded_handler will be freed.
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[948b0c8] | 337 | CompoundStmt * ExceptionMutatorCore::create_single_matcher(
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[288eede] | 338 | DeclarationWithType * except_obj, CatchStmt * modded_handler ) {
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[86d5ba7c] | 339 | // {
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| 340 | // `modded_handler.decl`
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[cbce272] | 341 | // if ( `decl.name = (virtual `decl.type`)`except`
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[86d5ba7c] | 342 | // [&& `modded_handler.cond`] ) {
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| 343 | // `modded_handler.body`
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| 344 | // }
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| 345 | // }
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| 346 |
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[cbce272] | 347 | CompoundStmt * block = new CompoundStmt( noLabels );
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| 348 |
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| 349 | // Local Declaration
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| 350 | ObjectDecl * local_except =
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| 351 | dynamic_cast<ObjectDecl *>( modded_handler->get_decl() );
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| 352 | assert( local_except );
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| 353 | block->push_back( new DeclStmt( noLabels, local_except ) );
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| 354 |
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[86d5ba7c] | 355 | // Check for type match.
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| 356 | Expression * cond = UntypedExpr::createAssign( nameOf( local_except ),
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| 357 | new VirtualCastExpr( nameOf( except_obj ),
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| 358 | local_except->get_type()->clone() ) );
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[ba912706] | 359 |
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[86d5ba7c] | 360 | // Add the check on the conditional if it is provided.
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[ba912706] | 361 | if ( modded_handler->get_cond() ) {
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[288eede] | 362 | cond = new LogicalExpr( cond, modded_handler->get_cond() );
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[ba912706] | 363 | }
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[86d5ba7c] | 364 | // Construct the match condition.
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[ba912706] | 365 | block->push_back( new IfStmt( noLabels,
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[288eede] | 366 | cond, modded_handler->get_body(), nullptr ) );
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[ba912706] | 367 |
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| 368 | modded_handler->set_decl( nullptr );
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| 369 | modded_handler->set_cond( nullptr );
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| 370 | modded_handler->set_body( nullptr );
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| 371 | delete modded_handler;
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| 372 | return block;
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| 373 | }
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| 374 |
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[948b0c8] | 375 | FunctionDecl * ExceptionMutatorCore::create_terminate_match(
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| 376 | CatchList &handlers ) {
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[86d5ba7c] | 377 | // int match(exception * except) {
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| 378 | // HANDLER WRAPPERS { return `index`; }
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| 379 | // }
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| 380 |
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[ba912706] | 381 | CompoundStmt * body = new CompoundStmt( noLabels );
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| 382 |
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[288eede] | 383 | FunctionType * func_type = match_func_t.clone();
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| 384 | DeclarationWithType * except_obj = func_type->get_parameters().back();
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| 385 |
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[ba912706] | 386 | // Index 1..{number of handlers}
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| 387 | int index = 0;
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| 388 | CatchList::iterator it;
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| 389 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) {
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| 390 | ++index;
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| 391 | CatchStmt * handler = *it;
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| 392 |
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[288eede] | 393 | // Body should have been taken by create_terminate_catch.
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| 394 | assert( nullptr == handler->get_body() );
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| 395 |
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| 396 | // Create new body.
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[ba912706] | 397 | handler->set_body( new ReturnStmt( noLabels,
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| 398 | new ConstantExpr( Constant::from_int( index ) ) ) );
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| 399 |
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[288eede] | 400 | // Create the handler.
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| 401 | body->push_back( create_single_matcher( except_obj, handler ) );
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| 402 | *it = nullptr;
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[ba912706] | 403 | }
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| 404 |
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[307a732] | 405 | body->push_back( new ReturnStmt( noLabels, new ConstantExpr(
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| 406 | Constant::from_int( 0 ) ) ) );
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| 407 |
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[ba912706] | 408 | return new FunctionDecl("match", Type::StorageClasses(),
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[288eede] | 409 | LinkageSpec::Cforall, func_type, body);
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[ba912706] | 410 | }
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| 411 |
|
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[948b0c8] | 412 | CompoundStmt * ExceptionMutatorCore::create_terminate_caller(
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[ba912706] | 413 | FunctionDecl * try_wrapper,
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| 414 | FunctionDecl * terminate_catch,
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[948b0c8] | 415 | FunctionDecl * terminate_match ) {
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[86d5ba7c] | 416 | // { __cfaehm__try_terminate(`try`, `catch`, `match`); }
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[ba912706] | 417 |
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[288eede] | 418 | UntypedExpr * caller = new UntypedExpr( new NameExpr(
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| 419 | "__cfaehm__try_terminate" ) );
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| 420 | std::list<Expression *>& args = caller->get_args();
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[ba912706] | 421 | args.push_back( nameOf( try_wrapper ) );
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| 422 | args.push_back( nameOf( terminate_catch ) );
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| 423 | args.push_back( nameOf( terminate_match ) );
|
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| 424 |
|
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[288eede] | 425 | CompoundStmt * callStmt = new CompoundStmt( noLabels );
|
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| 426 | callStmt->push_back( new ExprStmt( noLabels, caller ) );
|
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| 427 | return callStmt;
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[ba912706] | 428 | }
|
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| 429 |
|
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[948b0c8] | 430 | FunctionDecl * ExceptionMutatorCore::create_resume_handler(
|
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| 431 | CatchList &handlers ) {
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[86d5ba7c] | 432 | // bool handle(exception * except) {
|
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| 433 | // HANDLER WRAPPERS { `hander->body`; return true; }
|
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| 434 | // }
|
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[288eede] | 435 | CompoundStmt * body = new CompoundStmt( noLabels );
|
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| 436 |
|
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| 437 | FunctionType * func_type = match_func_t.clone();
|
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| 438 | DeclarationWithType * except_obj = func_type->get_parameters().back();
|
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[ba912706] | 439 |
|
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| 440 | CatchList::iterator it;
|
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| 441 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) {
|
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| 442 | CatchStmt * handler = *it;
|
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| 443 |
|
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| 444 | // Modifiy body.
|
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| 445 | CompoundStmt * handling_code =
|
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| 446 | dynamic_cast<CompoundStmt*>( handler->get_body() );
|
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| 447 | if ( ! handling_code ) {
|
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| 448 | handling_code = new CompoundStmt( noLabels );
|
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| 449 | handling_code->push_back( handler->get_body() );
|
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| 450 | }
|
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[288eede] | 451 | handling_code->push_back( new ReturnStmt( noLabels,
|
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[ad0be81] | 452 | new ConstantExpr( Constant::from_bool( true ) ) ) );
|
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[ba912706] | 453 | handler->set_body( handling_code );
|
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| 454 |
|
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| 455 | // Create the handler.
|
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[288eede] | 456 | body->push_back( create_single_matcher( except_obj, handler ) );
|
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| 457 | *it = nullptr;
|
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[ba912706] | 458 | }
|
---|
| 459 |
|
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[ad0be81] | 460 | body->push_back( new ReturnStmt( noLabels, new ConstantExpr(
|
---|
| 461 | Constant::from_bool( false ) ) ) );
|
---|
| 462 |
|
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[ba912706] | 463 | return new FunctionDecl("handle", Type::StorageClasses(),
|
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[288eede] | 464 | LinkageSpec::Cforall, func_type, body);
|
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[ba912706] | 465 | }
|
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| 466 |
|
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[948b0c8] | 467 | CompoundStmt * ExceptionMutatorCore::create_resume_wrapper(
|
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[ba912706] | 468 | Statement * wraps,
|
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| 469 | FunctionDecl * resume_handler ) {
|
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| 470 | CompoundStmt * body = new CompoundStmt( noLabels );
|
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| 471 |
|
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[288eede] | 472 | // struct __try_resume_node __resume_node
|
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| 473 | // __attribute__((cleanup( __cfaehm__try_resume_cleanup )));
|
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| 474 | // ** unwinding of the stack here could cause problems **
|
---|
| 475 | // ** however I don't think that can happen currently **
|
---|
| 476 | // __cfaehm__try_resume_setup( &__resume_node, resume_handler );
|
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[ba912706] | 477 |
|
---|
| 478 | std::list< Attribute * > attributes;
|
---|
| 479 | {
|
---|
| 480 | std::list< Expression * > attr_params;
|
---|
[288eede] | 481 | attr_params.push_back( new NameExpr(
|
---|
| 482 | "__cfaehm__try_resume_cleanup" ) );
|
---|
| 483 | attributes.push_back( new Attribute( "cleanup", attr_params ) );
|
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[ba912706] | 484 | }
|
---|
| 485 |
|
---|
[288eede] | 486 | ObjectDecl * obj = new ObjectDecl(
|
---|
| 487 | "__resume_node",
|
---|
[ba912706] | 488 | Type::StorageClasses(),
|
---|
| 489 | LinkageSpec::Cforall,
|
---|
| 490 | nullptr,
|
---|
[288eede] | 491 | new StructInstType(
|
---|
| 492 | Type::Qualifiers(),
|
---|
| 493 | node_decl
|
---|
| 494 | ),
|
---|
| 495 | nullptr,
|
---|
[ba912706] | 496 | attributes
|
---|
[288eede] | 497 | );
|
---|
| 498 | appendDeclStmt( body, obj );
|
---|
| 499 |
|
---|
| 500 | UntypedExpr *setup = new UntypedExpr( new NameExpr(
|
---|
| 501 | "__cfaehm__try_resume_setup" ) );
|
---|
[307a732] | 502 | setup->get_args().push_back( new AddressExpr( nameOf( obj ) ) );
|
---|
[288eede] | 503 | setup->get_args().push_back( nameOf( resume_handler ) );
|
---|
| 504 |
|
---|
| 505 | body->push_back( new ExprStmt( noLabels, setup ) );
|
---|
| 506 |
|
---|
[ba912706] | 507 | body->push_back( wraps );
|
---|
| 508 | return body;
|
---|
| 509 | }
|
---|
| 510 |
|
---|
[948b0c8] | 511 | FunctionDecl * ExceptionMutatorCore::create_finally_wrapper(
|
---|
| 512 | TryStmt * tryStmt ) {
|
---|
[86d5ba7c] | 513 | // void finally() { <finally code> }
|
---|
[288eede] | 514 | FinallyStmt * finally = tryStmt->get_finally();
|
---|
| 515 | CompoundStmt * body = finally->get_block();
|
---|
| 516 | finally->set_block( nullptr );
|
---|
| 517 | delete finally;
|
---|
[ba912706] | 518 | tryStmt->set_finally( nullptr );
|
---|
| 519 |
|
---|
| 520 | return new FunctionDecl("finally", Type::StorageClasses(),
|
---|
[307a732] | 521 | LinkageSpec::Cforall, finally_func_t.clone(), body);
|
---|
[ba912706] | 522 | }
|
---|
| 523 |
|
---|
[948b0c8] | 524 | ObjectDecl * ExceptionMutatorCore::create_finally_hook(
|
---|
| 525 | FunctionDecl * finally_wrapper ) {
|
---|
[288eede] | 526 | // struct __cfaehm__cleanup_hook __finally_hook
|
---|
| 527 | // __attribute__((cleanup( finally_wrapper )));
|
---|
[ba912706] | 528 |
|
---|
| 529 | // Make Cleanup Attribute.
|
---|
| 530 | std::list< Attribute * > attributes;
|
---|
| 531 | {
|
---|
| 532 | std::list< Expression * > attr_params;
|
---|
| 533 | attr_params.push_back( nameOf( finally_wrapper ) );
|
---|
[288eede] | 534 | attributes.push_back( new Attribute( "cleanup", attr_params ) );
|
---|
[ba912706] | 535 | }
|
---|
| 536 |
|
---|
[288eede] | 537 | return new ObjectDecl(
|
---|
| 538 | "__finally_hook",
|
---|
[ba912706] | 539 | Type::StorageClasses(),
|
---|
| 540 | LinkageSpec::Cforall,
|
---|
| 541 | nullptr,
|
---|
[288eede] | 542 | new StructInstType(
|
---|
[ac10576] | 543 | noQualifiers,
|
---|
[288eede] | 544 | hook_decl
|
---|
| 545 | ),
|
---|
[ba912706] | 546 | nullptr,
|
---|
| 547 | attributes
|
---|
| 548 | );
|
---|
| 549 | }
|
---|
| 550 |
|
---|
[948b0c8] | 551 | // Visiting/Mutating Functions
|
---|
[86d5ba7c] | 552 | void ExceptionMutatorCore::premutate( CatchStmt *catchStmt ) {
|
---|
[03eedd5] | 553 | // Validate the Statement's form.
|
---|
| 554 | ObjectDecl * decl =
|
---|
| 555 | dynamic_cast<ObjectDecl *>( catchStmt->get_decl() );
|
---|
| 556 | if ( decl && true /* check decl->get_type() */ ) {
|
---|
| 557 | // Pass.
|
---|
| 558 | } else if ( CatchStmt::Terminate == catchStmt->get_kind() ) {
|
---|
| 559 | throw SemanticError("catch must have exception type");
|
---|
| 560 | } else {
|
---|
| 561 | throw SemanticError("catchResume must have exception type");
|
---|
| 562 | }
|
---|
| 563 |
|
---|
| 564 | // Track the handler context.
|
---|
[86d5ba7c] | 565 | GuardValue( cur_context );
|
---|
| 566 | if ( CatchStmt::Terminate == catchStmt->get_kind() ) {
|
---|
| 567 | cur_context = TerHandler;
|
---|
| 568 |
|
---|
| 569 | GuardValue( handler_except_decl );
|
---|
[03eedd5] | 570 | handler_except_decl = decl;
|
---|
[86d5ba7c] | 571 | } else {
|
---|
| 572 | cur_context = ResHandler;
|
---|
| 573 | }
|
---|
| 574 | }
|
---|
| 575 |
|
---|
| 576 | void ExceptionMutatorCore::premutate( StructDecl *structDecl ) {
|
---|
| 577 | if ( !structDecl->has_body() ) {
|
---|
| 578 | // Skip children?
|
---|
| 579 | return;
|
---|
[cbce272] | 580 | } else if ( structDecl->get_name() == "__cfaehm__base_exception_t" ) {
|
---|
| 581 | assert( nullptr == except_decl );
|
---|
| 582 | except_decl = structDecl;
|
---|
| 583 | init_func_types();
|
---|
[86d5ba7c] | 584 | } else if ( structDecl->get_name() == "__cfaehm__try_resume_node" ) {
|
---|
| 585 | assert( nullptr == node_decl );
|
---|
| 586 | node_decl = structDecl;
|
---|
| 587 | } else if ( structDecl->get_name() == "__cfaehm__cleanup_hook" ) {
|
---|
| 588 | assert( nullptr == hook_decl );
|
---|
| 589 | hook_decl = structDecl;
|
---|
| 590 | }
|
---|
| 591 | // Later we might get the exception type as well.
|
---|
| 592 | }
|
---|
| 593 |
|
---|
[ba912706] | 594 | Statement * ExceptionMutatorCore::postmutate( ThrowStmt *throwStmt ) {
|
---|
[cbce272] | 595 | assert( except_decl );
|
---|
| 596 |
|
---|
[ba912706] | 597 | // Ignoring throwStmt->get_target() for now.
|
---|
| 598 | if ( ThrowStmt::Terminate == throwStmt->get_kind() ) {
|
---|
| 599 | if ( throwStmt->get_expr() ) {
|
---|
| 600 | return create_terminate_throw( throwStmt );
|
---|
[288eede] | 601 | } else if ( TerHandler == cur_context ) {
|
---|
[948b0c8] | 602 | return create_terminate_rethrow( throwStmt );
|
---|
[ba912706] | 603 | } else {
|
---|
| 604 | assertf(false, "Invalid throw in %s at %i\n",
|
---|
[288eede] | 605 | throwStmt->location.filename.c_str(),
|
---|
[ba912706] | 606 | throwStmt->location.linenumber);
|
---|
| 607 | return nullptr;
|
---|
| 608 | }
|
---|
| 609 | } else {
|
---|
| 610 | if ( throwStmt->get_expr() ) {
|
---|
| 611 | return create_resume_throw( throwStmt );
|
---|
[288eede] | 612 | } else if ( ResHandler == cur_context ) {
|
---|
[ba912706] | 613 | return create_resume_rethrow( throwStmt );
|
---|
| 614 | } else {
|
---|
| 615 | assertf(false, "Invalid throwResume in %s at %i\n",
|
---|
[288eede] | 616 | throwStmt->location.filename.c_str(),
|
---|
[ba912706] | 617 | throwStmt->location.linenumber);
|
---|
| 618 | return nullptr;
|
---|
| 619 | }
|
---|
| 620 | }
|
---|
| 621 | }
|
---|
| 622 |
|
---|
| 623 | Statement * ExceptionMutatorCore::postmutate( TryStmt *tryStmt ) {
|
---|
[cbce272] | 624 | assert( except_decl );
|
---|
[288eede] | 625 | assert( node_decl );
|
---|
| 626 | assert( hook_decl );
|
---|
| 627 |
|
---|
[ba912706] | 628 | // Generate a prefix for the function names?
|
---|
| 629 |
|
---|
[288eede] | 630 | CompoundStmt * block = new CompoundStmt( noLabels );
|
---|
| 631 | CompoundStmt * inner = take_try_block( tryStmt );
|
---|
[ba912706] | 632 |
|
---|
| 633 | if ( tryStmt->get_finally() ) {
|
---|
| 634 | // Define the helper function.
|
---|
| 635 | FunctionDecl * finally_block =
|
---|
| 636 | create_finally_wrapper( tryStmt );
|
---|
| 637 | appendDeclStmt( block, finally_block );
|
---|
| 638 | // Create and add the finally cleanup hook.
|
---|
[948b0c8] | 639 | appendDeclStmt( block, create_finally_hook( finally_block ) );
|
---|
[ba912706] | 640 | }
|
---|
| 641 |
|
---|
[288eede] | 642 | CatchList termination_handlers;
|
---|
| 643 | CatchList resumption_handlers;
|
---|
| 644 | split( tryStmt->get_catchers(),
|
---|
[1abc5ab] | 645 | termination_handlers, resumption_handlers );
|
---|
[ba912706] | 646 |
|
---|
[288eede] | 647 | if ( resumption_handlers.size() ) {
|
---|
[ba912706] | 648 | // Define the helper function.
|
---|
| 649 | FunctionDecl * resume_handler =
|
---|
| 650 | create_resume_handler( resumption_handlers );
|
---|
| 651 | appendDeclStmt( block, resume_handler );
|
---|
| 652 | // Prepare hooks
|
---|
[948b0c8] | 653 | inner = create_resume_wrapper( inner, resume_handler );
|
---|
[ba912706] | 654 | }
|
---|
| 655 |
|
---|
| 656 | if ( termination_handlers.size() ) {
|
---|
| 657 | // Define the three helper functions.
|
---|
| 658 | FunctionDecl * try_wrapper = create_try_wrapper( inner );
|
---|
| 659 | appendDeclStmt( block, try_wrapper );
|
---|
| 660 | FunctionDecl * terminate_catch =
|
---|
| 661 | create_terminate_catch( termination_handlers );
|
---|
| 662 | appendDeclStmt( block, terminate_catch );
|
---|
| 663 | FunctionDecl * terminate_match =
|
---|
| 664 | create_terminate_match( termination_handlers );
|
---|
| 665 | appendDeclStmt( block, terminate_match );
|
---|
| 666 | // Build the call to the try wrapper.
|
---|
| 667 | inner = create_terminate_caller(
|
---|
| 668 | try_wrapper, terminate_catch, terminate_match );
|
---|
| 669 | }
|
---|
| 670 |
|
---|
| 671 | // Embed the try block.
|
---|
| 672 | block->push_back( inner );
|
---|
| 673 |
|
---|
| 674 | return block;
|
---|
| 675 | }
|
---|
| 676 |
|
---|
[1abc5ab] | 677 | void translateEHM( std::list< Declaration *> & translationUnit ) {
|
---|
[ba912706] | 678 | PassVisitor<ExceptionMutatorCore> translator;
|
---|
[6fca7ea] | 679 | mutateAll( translationUnit, translator );
|
---|
[ba912706] | 680 | }
|
---|
| 681 | }
|
---|