[ba912706] | 1 | // |
---|
| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
---|
| 3 | // |
---|
| 4 | // The contents of this file are covered under the licence agreement in the |
---|
| 5 | // file "LICENCE" distributed with Cforall. |
---|
| 6 | // |
---|
| 7 | // ExceptVisitor.cc -- |
---|
| 8 | // |
---|
| 9 | // Author : Andrew Beach |
---|
| 10 | // Created On : Wed Jun 14 16:49:00 2017 |
---|
| 11 | // Last Modified By : Andrew Beach |
---|
[cbce272] | 12 | // Last Modified On : Tus Aug 8 16:54:00 2017 |
---|
[948b0c8] | 13 | // Update Count : 7 |
---|
[ba912706] | 14 | // |
---|
| 15 | |
---|
| 16 | #include "ExceptTranslate.h" |
---|
| 17 | #include "Common/PassVisitor.h" |
---|
[288eede] | 18 | #include "SynTree/Statement.h" |
---|
| 19 | #include "SynTree/Declaration.h" |
---|
| 20 | #include "SynTree/Expression.h" |
---|
| 21 | #include "SynTree/Type.h" |
---|
| 22 | #include "SynTree/Attribute.h" |
---|
[86d5ba7c] | 23 | #include "SynTree/VarExprReplacer.h" |
---|
[ba912706] | 24 | |
---|
[307a732] | 25 | namespace ControlStruct { |
---|
[ba912706] | 26 | |
---|
[948b0c8] | 27 | // Buricratic Helpers (Not having to do with the paritular operation.) |
---|
| 28 | |
---|
| 29 | typedef std::list<CatchStmt*> CatchList; |
---|
| 30 | |
---|
| 31 | void split( CatchList& allHandlers, CatchList& terHandlers, |
---|
| 32 | CatchList& resHandlers ) { |
---|
| 33 | while ( !allHandlers.empty() ) { |
---|
| 34 | CatchStmt * stmt = allHandlers.front(); |
---|
| 35 | allHandlers.pop_front(); |
---|
| 36 | if (CatchStmt::Terminate == stmt->get_kind()) { |
---|
| 37 | terHandlers.push_back(stmt); |
---|
| 38 | } else { |
---|
| 39 | resHandlers.push_back(stmt); |
---|
| 40 | } |
---|
| 41 | } |
---|
| 42 | } |
---|
| 43 | |
---|
| 44 | void appendDeclStmt( CompoundStmt * block, Declaration * item ) { |
---|
| 45 | block->push_back(new DeclStmt(noLabels, item)); |
---|
| 46 | } |
---|
| 47 | |
---|
| 48 | Expression * nameOf( DeclarationWithType * decl ) { |
---|
| 49 | return new VariableExpr( decl ); |
---|
| 50 | } |
---|
| 51 | |
---|
| 52 | class ExceptionMutatorCore : public WithGuards { |
---|
| 53 | enum Context { NoHandler, TerHandler, ResHandler }; |
---|
| 54 | |
---|
| 55 | // Also need to handle goto, break & continue. |
---|
| 56 | // They need to be cut off in a ResHandler, until we enter another |
---|
| 57 | // loop, switch or the goto stays within the function. |
---|
| 58 | |
---|
| 59 | Context cur_context; |
---|
| 60 | |
---|
| 61 | // The current (innermost) termination handler exception declaration. |
---|
| 62 | ObjectDecl * handler_except_decl; |
---|
| 63 | |
---|
| 64 | // The built in types used in translation. |
---|
| 65 | StructDecl * except_decl; |
---|
| 66 | StructDecl * node_decl; |
---|
| 67 | StructDecl * hook_decl; |
---|
| 68 | |
---|
| 69 | // The many helper functions for code/syntree generation. |
---|
| 70 | Statement * create_given_throw( |
---|
| 71 | const char * throwFunc, ThrowStmt * throwStmt ); |
---|
| 72 | Statement * create_terminate_throw( ThrowStmt * throwStmt ); |
---|
| 73 | Statement * create_terminate_rethrow( ThrowStmt * throwStmt ); |
---|
| 74 | Statement * create_resume_throw( ThrowStmt * throwStmt ); |
---|
| 75 | Statement * create_resume_rethrow( ThrowStmt * throwStmt ); |
---|
| 76 | CompoundStmt * take_try_block( TryStmt * tryStmt ); |
---|
| 77 | FunctionDecl * create_try_wrapper( CompoundStmt * body ); |
---|
| 78 | FunctionDecl * create_terminate_catch( CatchList &handlers ); |
---|
| 79 | CompoundStmt * create_single_matcher( |
---|
| 80 | DeclarationWithType * except_obj, CatchStmt * modded_handler ); |
---|
| 81 | FunctionDecl * create_terminate_match( CatchList &handlers ); |
---|
| 82 | CompoundStmt * create_terminate_caller( FunctionDecl * try_wrapper, |
---|
| 83 | FunctionDecl * terminate_catch, FunctionDecl * terminate_match ); |
---|
| 84 | FunctionDecl * create_resume_handler( CatchList &handlers ); |
---|
| 85 | CompoundStmt * create_resume_wrapper( |
---|
| 86 | Statement * wraps, FunctionDecl * resume_handler ); |
---|
| 87 | FunctionDecl * create_finally_wrapper( TryStmt * tryStmt ); |
---|
| 88 | ObjectDecl * create_finally_hook( FunctionDecl * finally_wrapper ); |
---|
| 89 | |
---|
| 90 | // Types used in translation, make sure to use clone. |
---|
| 91 | // void (*function)(); |
---|
| 92 | FunctionType try_func_t; |
---|
| 93 | // void (*function)(int, exception); |
---|
| 94 | FunctionType catch_func_t; |
---|
| 95 | // int (*function)(exception); |
---|
| 96 | FunctionType match_func_t; |
---|
| 97 | // bool (*function)(exception); |
---|
| 98 | FunctionType handle_func_t; |
---|
| 99 | // void (*function)(__attribute__((unused)) void *); |
---|
| 100 | FunctionType finally_func_t; |
---|
| 101 | |
---|
| 102 | StructInstType * create_except_type() { |
---|
| 103 | assert( except_decl ); |
---|
| 104 | return new StructInstType( noQualifiers, except_decl ); |
---|
| 105 | } |
---|
| 106 | void init_func_types(); |
---|
| 107 | |
---|
| 108 | public: |
---|
| 109 | ExceptionMutatorCore() : |
---|
| 110 | cur_context( NoHandler ), |
---|
| 111 | handler_except_decl( nullptr ), |
---|
| 112 | except_decl( nullptr ), node_decl( nullptr ), hook_decl( nullptr ), |
---|
| 113 | try_func_t( noQualifiers, false ), |
---|
| 114 | catch_func_t( noQualifiers, false ), |
---|
| 115 | match_func_t( noQualifiers, false ), |
---|
| 116 | handle_func_t( noQualifiers, false ), |
---|
| 117 | finally_func_t( noQualifiers, false ) |
---|
[cbce272] | 118 | {} |
---|
[948b0c8] | 119 | |
---|
| 120 | void premutate( CatchStmt *catchStmt ); |
---|
| 121 | void premutate( StructDecl *structDecl ); |
---|
| 122 | Statement * postmutate( ThrowStmt *throwStmt ); |
---|
| 123 | Statement * postmutate( TryStmt *tryStmt ); |
---|
| 124 | }; |
---|
| 125 | |
---|
| 126 | void ExceptionMutatorCore::init_func_types() { |
---|
[cbce272] | 127 | assert( except_decl ); |
---|
| 128 | |
---|
[ba912706] | 129 | ObjectDecl index_obj( |
---|
[288eede] | 130 | "__handler_index", |
---|
[ba912706] | 131 | Type::StorageClasses(), |
---|
| 132 | LinkageSpec::Cforall, |
---|
| 133 | /*bitfieldWidth*/ NULL, |
---|
[ac10576] | 134 | new BasicType( noQualifiers, BasicType::SignedInt ), |
---|
[ba912706] | 135 | /*init*/ NULL |
---|
[307a732] | 136 | ); |
---|
[ba912706] | 137 | ObjectDecl exception_obj( |
---|
[288eede] | 138 | "__exception_inst", |
---|
[ba912706] | 139 | Type::StorageClasses(), |
---|
| 140 | LinkageSpec::Cforall, |
---|
| 141 | /*bitfieldWidth*/ NULL, |
---|
[307a732] | 142 | new PointerType( |
---|
[ac10576] | 143 | noQualifiers, |
---|
[cbce272] | 144 | new StructInstType( noQualifiers, except_decl ) |
---|
[307a732] | 145 | ), |
---|
[ba912706] | 146 | /*init*/ NULL |
---|
[307a732] | 147 | ); |
---|
[ba912706] | 148 | ObjectDecl bool_obj( |
---|
[288eede] | 149 | "__ret_bool", |
---|
[ba912706] | 150 | Type::StorageClasses(), |
---|
| 151 | LinkageSpec::Cforall, |
---|
| 152 | /*bitfieldWidth*/ NULL, |
---|
[948b0c8] | 153 | new BasicType( noQualifiers, BasicType::Bool ), |
---|
[ba912706] | 154 | /*init*/ NULL |
---|
[307a732] | 155 | ); |
---|
| 156 | ObjectDecl voidptr_obj( |
---|
| 157 | "__hook", |
---|
| 158 | Type::StorageClasses(), |
---|
| 159 | LinkageSpec::Cforall, |
---|
| 160 | NULL, |
---|
| 161 | new PointerType( |
---|
[ac10576] | 162 | noQualifiers, |
---|
[307a732] | 163 | new VoidType( |
---|
[ac10576] | 164 | noQualifiers |
---|
[307a732] | 165 | ), |
---|
[948b0c8] | 166 | std::list<Attribute *>{ new Attribute( "unused" ) } |
---|
[307a732] | 167 | ), |
---|
| 168 | NULL |
---|
| 169 | ); |
---|
[ba912706] | 170 | |
---|
[307a732] | 171 | catch_func_t.get_parameters().push_back( index_obj.clone() ); |
---|
| 172 | catch_func_t.get_parameters().push_back( exception_obj.clone() ); |
---|
| 173 | match_func_t.get_returnVals().push_back( index_obj.clone() ); |
---|
| 174 | match_func_t.get_parameters().push_back( exception_obj.clone() ); |
---|
| 175 | handle_func_t.get_returnVals().push_back( bool_obj.clone() ); |
---|
| 176 | handle_func_t.get_parameters().push_back( exception_obj.clone() ); |
---|
| 177 | finally_func_t.get_parameters().push_back( voidptr_obj.clone() ); |
---|
[ba912706] | 178 | } |
---|
| 179 | |
---|
| 180 | // ThrowStmt Mutation Helpers |
---|
| 181 | |
---|
[948b0c8] | 182 | Statement * ExceptionMutatorCore::create_given_throw( |
---|
[307a732] | 183 | const char * throwFunc, ThrowStmt * throwStmt ) { |
---|
[cbce272] | 184 | // `throwFunc`( `throwStmt->get_name` ); |
---|
[307a732] | 185 | UntypedExpr * call = new UntypedExpr( new NameExpr( throwFunc ) ); |
---|
[cbce272] | 186 | call->get_args().push_back( throwStmt->get_expr() ); |
---|
[ba912706] | 187 | throwStmt->set_expr( nullptr ); |
---|
| 188 | delete throwStmt; |
---|
[cbce272] | 189 | return new ExprStmt( noLabels, call ); |
---|
[ba912706] | 190 | } |
---|
[307a732] | 191 | |
---|
[948b0c8] | 192 | Statement * ExceptionMutatorCore::create_terminate_throw( |
---|
| 193 | ThrowStmt *throwStmt ) { |
---|
[cbce272] | 194 | // __throw_terminate( `throwStmt->get_name()` ); } |
---|
[38ac6ec] | 195 | return create_given_throw( "__cfaehm__throw_terminate", throwStmt ); |
---|
[307a732] | 196 | } |
---|
[86d5ba7c] | 197 | |
---|
[948b0c8] | 198 | Statement * ExceptionMutatorCore::create_terminate_rethrow( |
---|
| 199 | ThrowStmt *throwStmt ) { |
---|
[86d5ba7c] | 200 | // { `handler_except_decl` = NULL; __rethrow_terminate(); } |
---|
[288eede] | 201 | assert( nullptr == throwStmt->get_expr() ); |
---|
[86d5ba7c] | 202 | assert( handler_except_decl ); |
---|
| 203 | |
---|
| 204 | CompoundStmt * result = new CompoundStmt( throwStmt->get_labels() ); |
---|
| 205 | result->push_back( new ExprStmt( noLabels, UntypedExpr::createAssign( |
---|
| 206 | nameOf( handler_except_decl ), |
---|
| 207 | new ConstantExpr( Constant::null( |
---|
| 208 | new PointerType( |
---|
| 209 | noQualifiers, |
---|
| 210 | handler_except_decl->get_type()->clone() |
---|
| 211 | ) |
---|
| 212 | ) ) |
---|
| 213 | ) ) ); |
---|
| 214 | result->push_back( new ExprStmt( |
---|
| 215 | noLabels, |
---|
[38ac6ec] | 216 | new UntypedExpr( new NameExpr( "__cfaehm__rethrow_terminate" ) ) |
---|
[86d5ba7c] | 217 | ) ); |
---|
[ba912706] | 218 | delete throwStmt; |
---|
| 219 | return result; |
---|
| 220 | } |
---|
[86d5ba7c] | 221 | |
---|
[948b0c8] | 222 | Statement * ExceptionMutatorCore::create_resume_throw( |
---|
| 223 | ThrowStmt *throwStmt ) { |
---|
[cbce272] | 224 | // __throw_resume( `throwStmt->get_name` ); |
---|
[38ac6ec] | 225 | return create_given_throw( "__cfaehm__throw_resume", throwStmt ); |
---|
[ba912706] | 226 | } |
---|
[86d5ba7c] | 227 | |
---|
[948b0c8] | 228 | Statement * ExceptionMutatorCore::create_resume_rethrow( |
---|
| 229 | ThrowStmt *throwStmt ) { |
---|
[ba912706] | 230 | // return false; |
---|
| 231 | Statement * result = new ReturnStmt( |
---|
| 232 | throwStmt->get_labels(), |
---|
[288eede] | 233 | new ConstantExpr( Constant::from_bool( false ) ) |
---|
[ba912706] | 234 | ); |
---|
| 235 | delete throwStmt; |
---|
| 236 | return result; |
---|
| 237 | } |
---|
| 238 | |
---|
| 239 | // TryStmt Mutation Helpers |
---|
| 240 | |
---|
[948b0c8] | 241 | CompoundStmt * ExceptionMutatorCore::take_try_block( TryStmt *tryStmt ) { |
---|
[ba912706] | 242 | CompoundStmt * block = tryStmt->get_block(); |
---|
| 243 | tryStmt->set_block( nullptr ); |
---|
| 244 | return block; |
---|
| 245 | } |
---|
[948b0c8] | 246 | |
---|
| 247 | FunctionDecl * ExceptionMutatorCore::create_try_wrapper( |
---|
| 248 | CompoundStmt *body ) { |
---|
[ba912706] | 249 | |
---|
[288eede] | 250 | return new FunctionDecl( "try", Type::StorageClasses(), |
---|
[307a732] | 251 | LinkageSpec::Cforall, try_func_t.clone(), body ); |
---|
[ba912706] | 252 | } |
---|
| 253 | |
---|
[948b0c8] | 254 | FunctionDecl * ExceptionMutatorCore::create_terminate_catch( |
---|
| 255 | CatchList &handlers ) { |
---|
[ba912706] | 256 | std::list<CaseStmt *> handler_wrappers; |
---|
| 257 | |
---|
[288eede] | 258 | FunctionType *func_type = catch_func_t.clone(); |
---|
| 259 | DeclarationWithType * index_obj = func_type->get_parameters().front(); |
---|
[86d5ba7c] | 260 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
---|
[288eede] | 261 | |
---|
[ba912706] | 262 | // Index 1..{number of handlers} |
---|
| 263 | int index = 0; |
---|
| 264 | CatchList::iterator it = handlers.begin(); |
---|
| 265 | for ( ; it != handlers.end() ; ++it ) { |
---|
| 266 | ++index; |
---|
| 267 | CatchStmt * handler = *it; |
---|
| 268 | |
---|
[288eede] | 269 | // case `index`: |
---|
| 270 | // { |
---|
[cbce272] | 271 | // `handler.decl` = { (virtual `decl.type`)`except` }; |
---|
| 272 | // `handler.body`; |
---|
[288eede] | 273 | // } |
---|
| 274 | // return; |
---|
[86d5ba7c] | 275 | CompoundStmt * block = new CompoundStmt( noLabels ); |
---|
| 276 | |
---|
[03eedd5] | 277 | // Just copy the exception value. (Post Validation) |
---|
[86d5ba7c] | 278 | ObjectDecl * handler_decl = |
---|
[03eedd5] | 279 | static_cast<ObjectDecl *>( handler->get_decl() ); |
---|
[86d5ba7c] | 280 | ObjectDecl * local_except = handler_decl->clone(); |
---|
[03eedd5] | 281 | local_except->set_init( |
---|
[86d5ba7c] | 282 | new ListInit({ new SingleInit( |
---|
| 283 | new VirtualCastExpr( nameOf( except_obj ), |
---|
| 284 | local_except->get_type() |
---|
| 285 | ) |
---|
[03eedd5] | 286 | ) }) |
---|
| 287 | ); |
---|
[86d5ba7c] | 288 | block->push_back( new DeclStmt( noLabels, local_except ) ); |
---|
| 289 | |
---|
| 290 | // Add the cleanup attribute. |
---|
| 291 | local_except->get_attributes().push_back( new Attribute( |
---|
| 292 | "cleanup", |
---|
| 293 | { new NameExpr( "__cfaehm__cleanup_terminate" ) } |
---|
| 294 | ) ); |
---|
| 295 | |
---|
| 296 | // Update variables in the body to point to this local copy. |
---|
| 297 | { |
---|
| 298 | VarExprReplacer::DeclMap mapping; |
---|
| 299 | mapping[ handler_decl ] = local_except; |
---|
| 300 | VarExprReplacer mapper( mapping ); |
---|
| 301 | handler->get_body()->accept( mapper ); |
---|
| 302 | } |
---|
| 303 | |
---|
| 304 | block->push_back( handler->get_body() ); |
---|
[288eede] | 305 | handler->set_body( nullptr ); |
---|
| 306 | |
---|
[86d5ba7c] | 307 | std::list<Statement *> caseBody |
---|
| 308 | { block, new ReturnStmt( noLabels, nullptr ) }; |
---|
[288eede] | 309 | handler_wrappers.push_back( new CaseStmt( |
---|
[ba912706] | 310 | noLabels, |
---|
| 311 | new ConstantExpr( Constant::from_int( index ) ), |
---|
[288eede] | 312 | caseBody |
---|
| 313 | ) ); |
---|
[ba912706] | 314 | } |
---|
| 315 | // TODO: Some sort of meaningful error on default perhaps? |
---|
| 316 | |
---|
[288eede] | 317 | std::list<Statement*> stmt_handlers; |
---|
| 318 | while ( !handler_wrappers.empty() ) { |
---|
| 319 | stmt_handlers.push_back( handler_wrappers.front() ); |
---|
| 320 | handler_wrappers.pop_front(); |
---|
| 321 | } |
---|
| 322 | |
---|
[ba912706] | 323 | SwitchStmt * handler_lookup = new SwitchStmt( |
---|
| 324 | noLabels, |
---|
[288eede] | 325 | nameOf( index_obj ), |
---|
| 326 | stmt_handlers |
---|
[ba912706] | 327 | ); |
---|
| 328 | CompoundStmt * body = new CompoundStmt( noLabels ); |
---|
| 329 | body->push_back( handler_lookup ); |
---|
| 330 | |
---|
| 331 | return new FunctionDecl("catch", Type::StorageClasses(), |
---|
[288eede] | 332 | LinkageSpec::Cforall, func_type, body); |
---|
[ba912706] | 333 | } |
---|
| 334 | |
---|
| 335 | // Create a single check from a moddified handler. |
---|
[288eede] | 336 | // except_obj is referenced, modded_handler will be freed. |
---|
[948b0c8] | 337 | CompoundStmt * ExceptionMutatorCore::create_single_matcher( |
---|
[288eede] | 338 | DeclarationWithType * except_obj, CatchStmt * modded_handler ) { |
---|
[86d5ba7c] | 339 | // { |
---|
| 340 | // `modded_handler.decl` |
---|
[cbce272] | 341 | // if ( `decl.name = (virtual `decl.type`)`except` |
---|
[86d5ba7c] | 342 | // [&& `modded_handler.cond`] ) { |
---|
| 343 | // `modded_handler.body` |
---|
| 344 | // } |
---|
| 345 | // } |
---|
| 346 | |
---|
[cbce272] | 347 | CompoundStmt * block = new CompoundStmt( noLabels ); |
---|
| 348 | |
---|
| 349 | // Local Declaration |
---|
| 350 | ObjectDecl * local_except = |
---|
| 351 | dynamic_cast<ObjectDecl *>( modded_handler->get_decl() ); |
---|
| 352 | assert( local_except ); |
---|
| 353 | block->push_back( new DeclStmt( noLabels, local_except ) ); |
---|
| 354 | |
---|
[86d5ba7c] | 355 | // Check for type match. |
---|
| 356 | Expression * cond = UntypedExpr::createAssign( nameOf( local_except ), |
---|
| 357 | new VirtualCastExpr( nameOf( except_obj ), |
---|
| 358 | local_except->get_type()->clone() ) ); |
---|
[ba912706] | 359 | |
---|
[86d5ba7c] | 360 | // Add the check on the conditional if it is provided. |
---|
[ba912706] | 361 | if ( modded_handler->get_cond() ) { |
---|
[288eede] | 362 | cond = new LogicalExpr( cond, modded_handler->get_cond() ); |
---|
[ba912706] | 363 | } |
---|
[86d5ba7c] | 364 | // Construct the match condition. |
---|
[ba912706] | 365 | block->push_back( new IfStmt( noLabels, |
---|
[288eede] | 366 | cond, modded_handler->get_body(), nullptr ) ); |
---|
[ba912706] | 367 | |
---|
| 368 | modded_handler->set_decl( nullptr ); |
---|
| 369 | modded_handler->set_cond( nullptr ); |
---|
| 370 | modded_handler->set_body( nullptr ); |
---|
| 371 | delete modded_handler; |
---|
| 372 | return block; |
---|
| 373 | } |
---|
| 374 | |
---|
[948b0c8] | 375 | FunctionDecl * ExceptionMutatorCore::create_terminate_match( |
---|
| 376 | CatchList &handlers ) { |
---|
[86d5ba7c] | 377 | // int match(exception * except) { |
---|
| 378 | // HANDLER WRAPPERS { return `index`; } |
---|
| 379 | // } |
---|
| 380 | |
---|
[ba912706] | 381 | CompoundStmt * body = new CompoundStmt( noLabels ); |
---|
| 382 | |
---|
[288eede] | 383 | FunctionType * func_type = match_func_t.clone(); |
---|
| 384 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
---|
| 385 | |
---|
[ba912706] | 386 | // Index 1..{number of handlers} |
---|
| 387 | int index = 0; |
---|
| 388 | CatchList::iterator it; |
---|
| 389 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) { |
---|
| 390 | ++index; |
---|
| 391 | CatchStmt * handler = *it; |
---|
| 392 | |
---|
[288eede] | 393 | // Body should have been taken by create_terminate_catch. |
---|
| 394 | assert( nullptr == handler->get_body() ); |
---|
| 395 | |
---|
| 396 | // Create new body. |
---|
[ba912706] | 397 | handler->set_body( new ReturnStmt( noLabels, |
---|
| 398 | new ConstantExpr( Constant::from_int( index ) ) ) ); |
---|
| 399 | |
---|
[288eede] | 400 | // Create the handler. |
---|
| 401 | body->push_back( create_single_matcher( except_obj, handler ) ); |
---|
| 402 | *it = nullptr; |
---|
[ba912706] | 403 | } |
---|
| 404 | |
---|
[307a732] | 405 | body->push_back( new ReturnStmt( noLabels, new ConstantExpr( |
---|
| 406 | Constant::from_int( 0 ) ) ) ); |
---|
| 407 | |
---|
[ba912706] | 408 | return new FunctionDecl("match", Type::StorageClasses(), |
---|
[288eede] | 409 | LinkageSpec::Cforall, func_type, body); |
---|
[ba912706] | 410 | } |
---|
| 411 | |
---|
[948b0c8] | 412 | CompoundStmt * ExceptionMutatorCore::create_terminate_caller( |
---|
[ba912706] | 413 | FunctionDecl * try_wrapper, |
---|
| 414 | FunctionDecl * terminate_catch, |
---|
[948b0c8] | 415 | FunctionDecl * terminate_match ) { |
---|
[86d5ba7c] | 416 | // { __cfaehm__try_terminate(`try`, `catch`, `match`); } |
---|
[ba912706] | 417 | |
---|
[288eede] | 418 | UntypedExpr * caller = new UntypedExpr( new NameExpr( |
---|
| 419 | "__cfaehm__try_terminate" ) ); |
---|
| 420 | std::list<Expression *>& args = caller->get_args(); |
---|
[ba912706] | 421 | args.push_back( nameOf( try_wrapper ) ); |
---|
| 422 | args.push_back( nameOf( terminate_catch ) ); |
---|
| 423 | args.push_back( nameOf( terminate_match ) ); |
---|
| 424 | |
---|
[288eede] | 425 | CompoundStmt * callStmt = new CompoundStmt( noLabels ); |
---|
| 426 | callStmt->push_back( new ExprStmt( noLabels, caller ) ); |
---|
| 427 | return callStmt; |
---|
[ba912706] | 428 | } |
---|
| 429 | |
---|
[948b0c8] | 430 | FunctionDecl * ExceptionMutatorCore::create_resume_handler( |
---|
| 431 | CatchList &handlers ) { |
---|
[86d5ba7c] | 432 | // bool handle(exception * except) { |
---|
| 433 | // HANDLER WRAPPERS { `hander->body`; return true; } |
---|
| 434 | // } |
---|
[288eede] | 435 | CompoundStmt * body = new CompoundStmt( noLabels ); |
---|
| 436 | |
---|
| 437 | FunctionType * func_type = match_func_t.clone(); |
---|
| 438 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
---|
[ba912706] | 439 | |
---|
| 440 | CatchList::iterator it; |
---|
| 441 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) { |
---|
| 442 | CatchStmt * handler = *it; |
---|
| 443 | |
---|
| 444 | // Modifiy body. |
---|
| 445 | CompoundStmt * handling_code = |
---|
| 446 | dynamic_cast<CompoundStmt*>( handler->get_body() ); |
---|
| 447 | if ( ! handling_code ) { |
---|
| 448 | handling_code = new CompoundStmt( noLabels ); |
---|
| 449 | handling_code->push_back( handler->get_body() ); |
---|
| 450 | } |
---|
[288eede] | 451 | handling_code->push_back( new ReturnStmt( noLabels, |
---|
[ad0be81] | 452 | new ConstantExpr( Constant::from_bool( true ) ) ) ); |
---|
[ba912706] | 453 | handler->set_body( handling_code ); |
---|
| 454 | |
---|
| 455 | // Create the handler. |
---|
[288eede] | 456 | body->push_back( create_single_matcher( except_obj, handler ) ); |
---|
| 457 | *it = nullptr; |
---|
[ba912706] | 458 | } |
---|
| 459 | |
---|
[ad0be81] | 460 | body->push_back( new ReturnStmt( noLabels, new ConstantExpr( |
---|
| 461 | Constant::from_bool( false ) ) ) ); |
---|
| 462 | |
---|
[ba912706] | 463 | return new FunctionDecl("handle", Type::StorageClasses(), |
---|
[288eede] | 464 | LinkageSpec::Cforall, func_type, body); |
---|
[ba912706] | 465 | } |
---|
| 466 | |
---|
[948b0c8] | 467 | CompoundStmt * ExceptionMutatorCore::create_resume_wrapper( |
---|
[ba912706] | 468 | Statement * wraps, |
---|
| 469 | FunctionDecl * resume_handler ) { |
---|
| 470 | CompoundStmt * body = new CompoundStmt( noLabels ); |
---|
| 471 | |
---|
[288eede] | 472 | // struct __try_resume_node __resume_node |
---|
| 473 | // __attribute__((cleanup( __cfaehm__try_resume_cleanup ))); |
---|
| 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 ); |
---|
[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 ) ); |
---|
[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 | } |
---|