[71f4e4f] | 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 | // FixInit.h -- |
---|
| 8 | // |
---|
| 9 | // Author : Rob Schluntz |
---|
| 10 | // Created On : Wed Jan 13 16:29:30 2016 |
---|
[adcc065] | 11 | // Last Modified By : Peter A. Buhr |
---|
[4e06c1e] | 12 | // Last Modified On : Tue Jul 12 17:41:15 2016 |
---|
| 13 | // Update Count : 34 |
---|
[71f4e4f] | 14 | // |
---|
| 15 | |
---|
| 16 | #include <stack> |
---|
| 17 | #include <list> |
---|
[c2931ea] | 18 | #include <iterator> |
---|
| 19 | #include <algorithm> |
---|
[7b3f66b] | 20 | #include "InitTweak.h" |
---|
[6cf27a07] | 21 | #include "FixInit.h" |
---|
| 22 | #include "FixGlobalInit.h" |
---|
[db4ecc5] | 23 | #include "ResolvExpr/Resolver.h" |
---|
[845cedc] | 24 | #include "ResolvExpr/typeops.h" |
---|
[71f4e4f] | 25 | #include "SynTree/Declaration.h" |
---|
| 26 | #include "SynTree/Type.h" |
---|
| 27 | #include "SynTree/Expression.h" |
---|
[f9cebb5] | 28 | #include "SynTree/Attribute.h" |
---|
[71f4e4f] | 29 | #include "SynTree/Statement.h" |
---|
| 30 | #include "SynTree/Initializer.h" |
---|
| 31 | #include "SynTree/Mutator.h" |
---|
[db4ecc5] | 32 | #include "SymTab/Indexer.h" |
---|
[c8dfcd3] | 33 | #include "SymTab/Autogen.h" |
---|
[71f4e4f] | 34 | #include "GenPoly/PolyMutator.h" |
---|
[c2931ea] | 35 | #include "SynTree/AddStmtVisitor.h" |
---|
[79970ed] | 36 | #include "CodeGen/GenType.h" // for warnings |
---|
[71f4e4f] | 37 | |
---|
[845cedc] | 38 | bool ctordtorp = false; |
---|
[c2931ea] | 39 | bool ctorp = false; |
---|
| 40 | bool cpctorp = false; |
---|
[e39aa0f] | 41 | bool dtorp = false; |
---|
[845cedc] | 42 | #define PRINT( text ) if ( ctordtorp ) { text } |
---|
[c2931ea] | 43 | #define CP_CTOR_PRINT( text ) if ( ctordtorp || cpctorp ) { text } |
---|
| 44 | #define DTOR_PRINT( text ) if ( ctordtorp || dtorp ) { text } |
---|
[845cedc] | 45 | |
---|
[71f4e4f] | 46 | namespace InitTweak { |
---|
| 47 | namespace { |
---|
| 48 | const std::list<Label> noLabels; |
---|
[e0323a2] | 49 | const std::list<Expression*> noDesignators; |
---|
[71f4e4f] | 50 | |
---|
[c2931ea] | 51 | class InsertImplicitCalls : public GenPoly::PolyMutator { |
---|
| 52 | public: |
---|
[adcc065] | 53 | /// wrap function application expressions as ImplicitCopyCtorExpr nodes so that it is easy to identify which |
---|
| 54 | /// function calls need their parameters to be copy constructed |
---|
[c2931ea] | 55 | static void insert( std::list< Declaration * > & translationUnit ); |
---|
| 56 | |
---|
| 57 | virtual Expression * mutate( ApplicationExpr * appExpr ); |
---|
| 58 | }; |
---|
| 59 | |
---|
| 60 | class ResolveCopyCtors : public SymTab::Indexer { |
---|
| 61 | public: |
---|
[adcc065] | 62 | /// generate temporary ObjectDecls for each argument and return value of each ImplicitCopyCtorExpr, |
---|
| 63 | /// generate/resolve copy construction expressions for each, and generate/resolve destructors for both |
---|
| 64 | /// arguments and return value temporaries |
---|
[c2931ea] | 65 | static void resolveImplicitCalls( std::list< Declaration * > & translationUnit ); |
---|
| 66 | |
---|
| 67 | virtual void visit( ImplicitCopyCtorExpr * impCpCtorExpr ); |
---|
| 68 | |
---|
| 69 | /// create and resolve ctor/dtor expression: fname(var, [cpArg]) |
---|
| 70 | ApplicationExpr * makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg = NULL ); |
---|
| 71 | /// true if type does not need to be copy constructed to ensure correctness |
---|
| 72 | bool skipCopyConstruct( Type * ); |
---|
| 73 | private: |
---|
| 74 | TypeSubstitution * env; |
---|
| 75 | }; |
---|
| 76 | |
---|
| 77 | /// collects constructed object decls - used as a base class |
---|
| 78 | class ObjDeclCollector : public AddStmtVisitor { |
---|
| 79 | public: |
---|
| 80 | typedef AddStmtVisitor Parent; |
---|
| 81 | using Parent::visit; |
---|
| 82 | typedef std::set< ObjectDecl * > ObjectSet; |
---|
| 83 | virtual void visit( CompoundStmt *compoundStmt ); |
---|
| 84 | virtual void visit( DeclStmt *stmt ); |
---|
| 85 | protected: |
---|
| 86 | ObjectSet curVars; |
---|
| 87 | }; |
---|
| 88 | |
---|
[6cf27a07] | 89 | // debug |
---|
[c2931ea] | 90 | struct printSet { |
---|
| 91 | typedef ObjDeclCollector::ObjectSet ObjectSet; |
---|
| 92 | printSet( const ObjectSet & objs ) : objs( objs ) {} |
---|
| 93 | const ObjectSet & objs; |
---|
| 94 | }; |
---|
| 95 | std::ostream & operator<<( std::ostream & out, const printSet & set) { |
---|
| 96 | out << "{ "; |
---|
| 97 | for ( ObjectDecl * obj : set.objs ) { |
---|
| 98 | out << obj->get_name() << ", " ; |
---|
[adcc065] | 99 | } // for |
---|
[c2931ea] | 100 | out << " }"; |
---|
| 101 | return out; |
---|
| 102 | } |
---|
| 103 | |
---|
| 104 | class LabelFinder : public ObjDeclCollector { |
---|
| 105 | public: |
---|
| 106 | typedef ObjDeclCollector Parent; |
---|
| 107 | typedef std::map< Label, ObjectSet > LabelMap; |
---|
| 108 | // map of Label -> live variables at that label |
---|
| 109 | LabelMap vars; |
---|
| 110 | |
---|
| 111 | void handleStmt( Statement * stmt ); |
---|
| 112 | |
---|
| 113 | // xxx - This needs to be done better. |
---|
[adcc065] | 114 | // allow some generalization among different kinds of nodes with with similar parentage (e.g. all |
---|
| 115 | // expressions, all statements, etc.) important to have this to provide a single entry point so that as new |
---|
| 116 | // subclasses are added, there is only one place that the code has to be updated, rather than ensure that |
---|
| 117 | // every specialized class knows about every new kind of statement that might be added. |
---|
[c2931ea] | 118 | virtual void visit( CompoundStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 119 | virtual void visit( ExprStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 120 | virtual void visit( AsmStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 121 | virtual void visit( IfStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 122 | virtual void visit( WhileStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 123 | virtual void visit( ForStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 124 | virtual void visit( SwitchStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 125 | virtual void visit( CaseStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 126 | virtual void visit( BranchStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 127 | virtual void visit( ReturnStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 128 | virtual void visit( TryStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 129 | virtual void visit( CatchStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 130 | virtual void visit( FinallyStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 131 | virtual void visit( NullStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 132 | virtual void visit( DeclStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 133 | virtual void visit( ImplicitCtorDtorStmt *stmt ) { handleStmt( stmt ); return Parent::visit( stmt ); } |
---|
| 134 | }; |
---|
| 135 | |
---|
| 136 | class InsertDtors : public ObjDeclCollector { |
---|
| 137 | public: |
---|
[adcc065] | 138 | /// insert destructor calls at the appropriate places. must happen before CtorInit nodes are removed |
---|
| 139 | /// (currently by FixInit) |
---|
[c2931ea] | 140 | static void insert( std::list< Declaration * > & translationUnit ); |
---|
| 141 | |
---|
| 142 | typedef ObjDeclCollector Parent; |
---|
| 143 | typedef std::list< ObjectDecl * > OrderedDecls; |
---|
| 144 | typedef std::list< OrderedDecls > OrderedDeclsStack; |
---|
| 145 | |
---|
| 146 | InsertDtors( LabelFinder & finder ) : labelVars( finder.vars ) {} |
---|
| 147 | |
---|
| 148 | virtual void visit( ObjectDecl * objDecl ); |
---|
| 149 | |
---|
| 150 | virtual void visit( CompoundStmt * compoundStmt ); |
---|
| 151 | virtual void visit( ReturnStmt * returnStmt ); |
---|
| 152 | virtual void visit( BranchStmt * stmt ); |
---|
| 153 | private: |
---|
| 154 | void handleGoto( BranchStmt * stmt ); |
---|
| 155 | |
---|
| 156 | LabelFinder::LabelMap & labelVars; |
---|
| 157 | OrderedDeclsStack reverseDeclOrder; |
---|
| 158 | }; |
---|
| 159 | |
---|
| 160 | class FixInit : public GenPoly::PolyMutator { |
---|
| 161 | public: |
---|
| 162 | /// expand each object declaration to use its constructor after it is declared. |
---|
| 163 | static void fixInitializers( std::list< Declaration * > &translationUnit ); |
---|
| 164 | |
---|
| 165 | virtual DeclarationWithType * mutate( ObjectDecl *objDecl ); |
---|
[72e9222] | 166 | |
---|
| 167 | std::list< Declaration * > staticDtorDecls; |
---|
[c2931ea] | 168 | }; |
---|
| 169 | |
---|
| 170 | class FixCopyCtors : public GenPoly::PolyMutator { |
---|
| 171 | public: |
---|
[adcc065] | 172 | /// expand ImplicitCopyCtorExpr nodes into the temporary declarations, copy constructors, call expression, |
---|
| 173 | /// and destructors |
---|
[c2931ea] | 174 | static void fixCopyCtors( std::list< Declaration * > &translationUnit ); |
---|
| 175 | |
---|
| 176 | virtual Expression * mutate( ImplicitCopyCtorExpr * impCpCtorExpr ); |
---|
| 177 | }; |
---|
[79970ed] | 178 | |
---|
[c8dfcd3] | 179 | class GenStructMemberCalls : public SymTab::Indexer { |
---|
[79970ed] | 180 | public: |
---|
[c8dfcd3] | 181 | typedef Indexer Parent; |
---|
| 182 | /// generate default/copy ctor and dtor calls for user-defined struct ctor/dtors |
---|
| 183 | /// for any member that is missing a corresponding ctor/dtor call. |
---|
| 184 | /// error if a member is used before constructed |
---|
| 185 | static void generate( std::list< Declaration * > & translationUnit ); |
---|
[79970ed] | 186 | |
---|
| 187 | virtual void visit( FunctionDecl * funcDecl ); |
---|
| 188 | |
---|
| 189 | virtual void visit( MemberExpr * memberExpr ); |
---|
| 190 | virtual void visit( ApplicationExpr * appExpr ); |
---|
| 191 | |
---|
[3906301] | 192 | SemanticError errors; |
---|
[79970ed] | 193 | private: |
---|
| 194 | void handleFirstParam( Expression * firstParam ); |
---|
[3906301] | 195 | template< typename... Params > |
---|
| 196 | void emit( const Params &... params ); |
---|
[79970ed] | 197 | |
---|
| 198 | FunctionDecl * function = 0; |
---|
[c8dfcd3] | 199 | std::set< DeclarationWithType * > unhandled, usedUninit; |
---|
[79970ed] | 200 | ObjectDecl * thisParam = 0; |
---|
[c8dfcd3] | 201 | bool isCtor = false; // true if current function is a constructor |
---|
| 202 | }; |
---|
| 203 | |
---|
| 204 | // very simple resolver-like mutator class - used to |
---|
| 205 | // resolve UntypedExprs that are found within newly |
---|
| 206 | // generated constructor/destructor calls |
---|
| 207 | class MutatingResolver : public Mutator { |
---|
| 208 | public: |
---|
| 209 | MutatingResolver( SymTab::Indexer & indexer ) : indexer( indexer ) {} |
---|
| 210 | |
---|
| 211 | virtual DeclarationWithType* mutate( ObjectDecl *objectDecl ); |
---|
| 212 | |
---|
| 213 | virtual Expression* mutate( UntypedExpr *untypedExpr ); |
---|
| 214 | private: |
---|
| 215 | SymTab::Indexer & indexer; |
---|
[79970ed] | 216 | }; |
---|
[c2931ea] | 217 | } // namespace |
---|
[db4ecc5] | 218 | |
---|
[6cf27a07] | 219 | void fix( std::list< Declaration * > & translationUnit, const std::string & filename, bool inLibrary ) { |
---|
| 220 | // fixes ConstructorInit for global variables. should happen before fixInitializers. |
---|
| 221 | InitTweak::fixGlobalInit( translationUnit, filename, inLibrary ); |
---|
| 222 | |
---|
[db4ecc5] | 223 | InsertImplicitCalls::insert( translationUnit ); |
---|
| 224 | ResolveCopyCtors::resolveImplicitCalls( translationUnit ); |
---|
[c2931ea] | 225 | InsertDtors::insert( translationUnit ); |
---|
[71f4e4f] | 226 | FixInit::fixInitializers( translationUnit ); |
---|
[c2931ea] | 227 | |
---|
[db4ecc5] | 228 | // FixCopyCtors must happen after FixInit, so that destructors are placed correctly |
---|
| 229 | FixCopyCtors::fixCopyCtors( translationUnit ); |
---|
[79970ed] | 230 | |
---|
[c8dfcd3] | 231 | GenStructMemberCalls::generate( translationUnit ); |
---|
[db4ecc5] | 232 | } |
---|
| 233 | |
---|
[c2931ea] | 234 | namespace { |
---|
| 235 | void InsertImplicitCalls::insert( std::list< Declaration * > & translationUnit ) { |
---|
| 236 | InsertImplicitCalls inserter; |
---|
| 237 | mutateAll( translationUnit, inserter ); |
---|
| 238 | } |
---|
[db4ecc5] | 239 | |
---|
[c2931ea] | 240 | void ResolveCopyCtors::resolveImplicitCalls( std::list< Declaration * > & translationUnit ) { |
---|
| 241 | ResolveCopyCtors resolver; |
---|
| 242 | acceptAll( translationUnit, resolver ); |
---|
| 243 | } |
---|
[71f4e4f] | 244 | |
---|
[c2931ea] | 245 | void FixInit::fixInitializers( std::list< Declaration * > & translationUnit ) { |
---|
| 246 | FixInit fixer; |
---|
[72e9222] | 247 | |
---|
| 248 | // can't use mutateAll, because need to insert declarations at top-level |
---|
| 249 | // can't use DeclMutator, because sometimes need to insert IfStmt, etc. |
---|
| 250 | SemanticError errors; |
---|
| 251 | for ( std::list< Declaration * >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) { |
---|
| 252 | try { |
---|
| 253 | *i = maybeMutate( *i, fixer ); |
---|
[f9cebb5] | 254 | translationUnit.splice( i, fixer.staticDtorDecls ); |
---|
[72e9222] | 255 | } catch( SemanticError &e ) { |
---|
| 256 | errors.append( e ); |
---|
| 257 | } // try |
---|
| 258 | } // for |
---|
| 259 | if ( ! errors.isEmpty() ) { |
---|
| 260 | throw errors; |
---|
| 261 | } // if |
---|
[c2931ea] | 262 | } |
---|
[71f4e4f] | 263 | |
---|
[c2931ea] | 264 | void InsertDtors::insert( std::list< Declaration * > & translationUnit ) { |
---|
| 265 | LabelFinder finder; |
---|
| 266 | InsertDtors inserter( finder ); |
---|
| 267 | acceptAll( translationUnit, finder ); |
---|
| 268 | acceptAll( translationUnit, inserter ); |
---|
| 269 | } |
---|
| 270 | |
---|
| 271 | void FixCopyCtors::fixCopyCtors( std::list< Declaration * > & translationUnit ) { |
---|
| 272 | FixCopyCtors fixer; |
---|
| 273 | mutateAll( translationUnit, fixer ); |
---|
| 274 | } |
---|
[db4ecc5] | 275 | |
---|
[c8dfcd3] | 276 | void GenStructMemberCalls::generate( std::list< Declaration * > & translationUnit ) { |
---|
| 277 | GenStructMemberCalls warner; |
---|
| 278 | acceptAll( translationUnit, warner ); |
---|
[3906301] | 279 | |
---|
[c8dfcd3] | 280 | // visitor doesn't throw so that it can collect all errors |
---|
| 281 | if ( ! warner.errors.isEmpty() ) { |
---|
| 282 | throw warner.errors; |
---|
[79970ed] | 283 | } |
---|
| 284 | } |
---|
| 285 | |
---|
[c2931ea] | 286 | Expression * InsertImplicitCalls::mutate( ApplicationExpr * appExpr ) { |
---|
| 287 | appExpr = dynamic_cast< ApplicationExpr * >( Mutator::mutate( appExpr ) ); |
---|
| 288 | assert( appExpr ); |
---|
| 289 | |
---|
| 290 | if ( VariableExpr * function = dynamic_cast< VariableExpr * > ( appExpr->get_function() ) ) { |
---|
| 291 | if ( function->get_var()->get_linkage() == LinkageSpec::Intrinsic ) { |
---|
| 292 | // optimization: don't need to copy construct in order to call intrinsic functions |
---|
| 293 | return appExpr; |
---|
| 294 | } else if ( DeclarationWithType * funcDecl = dynamic_cast< DeclarationWithType * > ( function->get_var() ) ) { |
---|
| 295 | FunctionType * ftype = dynamic_cast< FunctionType * >( GenPoly::getFunctionType( funcDecl->get_type() ) ); |
---|
| 296 | assert( ftype ); |
---|
[79970ed] | 297 | if ( (isConstructor( funcDecl->get_name() ) || funcDecl->get_name() == "?=?") && ftype->get_parameters().size() == 2 ) { |
---|
[c2931ea] | 298 | Type * t1 = ftype->get_parameters().front()->get_type(); |
---|
| 299 | Type * t2 = ftype->get_parameters().back()->get_type(); |
---|
| 300 | PointerType * ptrType = dynamic_cast< PointerType * > ( t1 ); |
---|
| 301 | assert( ptrType ); |
---|
| 302 | |
---|
| 303 | if ( ResolvExpr::typesCompatible( ptrType->get_base(), t2, SymTab::Indexer() ) ) { |
---|
| 304 | // optimization: don't need to copy construct in order to call a copy constructor or |
---|
| 305 | // assignment operator |
---|
| 306 | return appExpr; |
---|
[adcc065] | 307 | } // if |
---|
[79970ed] | 308 | } else if ( isDestructor( funcDecl->get_name() ) ) { |
---|
[c2931ea] | 309 | // correctness: never copy construct arguments to a destructor |
---|
[845cedc] | 310 | return appExpr; |
---|
[adcc065] | 311 | } // if |
---|
| 312 | } // if |
---|
| 313 | } // if |
---|
[c2931ea] | 314 | CP_CTOR_PRINT( std::cerr << "InsertImplicitCalls: adding a wrapper " << appExpr << std::endl; ) |
---|
| 315 | |
---|
| 316 | // wrap each function call so that it is easy to identify nodes that have to be copy constructed |
---|
| 317 | ImplicitCopyCtorExpr * expr = new ImplicitCopyCtorExpr( appExpr ); |
---|
| 318 | // save the type substitution onto the new node so that it is easy to find. |
---|
| 319 | // Ensure it is not deleted with the ImplicitCopyCtorExpr by removing it before deletion. |
---|
| 320 | // The substitution is needed to obtain the type of temporary variables so that copy constructor |
---|
| 321 | // calls can be resolved. Normally this is what PolyMutator is for, but the pass that resolves |
---|
| 322 | // copy constructor calls must be an Indexer. We could alternatively make a PolyIndexer which |
---|
| 323 | // saves the environment, or compute the types of temporaries here, but it's much simpler to |
---|
| 324 | // save the environment here, and more cohesive to compute temporary variables and resolve copy |
---|
| 325 | // constructor calls together. |
---|
| 326 | assert( env ); |
---|
| 327 | expr->set_env( env ); |
---|
| 328 | return expr; |
---|
[db4ecc5] | 329 | } |
---|
| 330 | |
---|
[c2931ea] | 331 | bool ResolveCopyCtors::skipCopyConstruct( Type * type ) { |
---|
| 332 | return dynamic_cast< VarArgsType * >( type ) || GenPoly::getFunctionType( type ); |
---|
| 333 | } |
---|
| 334 | |
---|
| 335 | ApplicationExpr * ResolveCopyCtors::makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg ) { |
---|
| 336 | assert( var ); |
---|
| 337 | UntypedExpr * untyped = new UntypedExpr( new NameExpr( fname ) ); |
---|
| 338 | untyped->get_args().push_back( new AddressExpr( new VariableExpr( var ) ) ); |
---|
[03b812d2] | 339 | if (cpArg) untyped->get_args().push_back( cpArg->clone() ); |
---|
[c2931ea] | 340 | |
---|
| 341 | // resolve copy constructor |
---|
[adcc065] | 342 | // should only be one alternative for copy ctor and dtor expressions, since all arguments are fixed |
---|
| 343 | // (VariableExpr and already resolved expression) |
---|
[c2931ea] | 344 | CP_CTOR_PRINT( std::cerr << "ResolvingCtorDtor " << untyped << std::endl; ) |
---|
| 345 | ApplicationExpr * resolved = dynamic_cast< ApplicationExpr * >( ResolvExpr::findVoidExpression( untyped, *this ) ); |
---|
| 346 | if ( resolved->get_env() ) { |
---|
| 347 | env->add( *resolved->get_env() ); |
---|
[adcc065] | 348 | } // if |
---|
[cf18eea] | 349 | |
---|
[c2931ea] | 350 | assert( resolved ); |
---|
| 351 | delete untyped; |
---|
| 352 | return resolved; |
---|
[540de412] | 353 | } |
---|
[db4ecc5] | 354 | |
---|
[c2931ea] | 355 | void ResolveCopyCtors::visit( ImplicitCopyCtorExpr *impCpCtorExpr ) { |
---|
| 356 | static UniqueName tempNamer("_tmp_cp"); |
---|
| 357 | static UniqueName retNamer("_tmp_cp_ret"); |
---|
| 358 | |
---|
| 359 | CP_CTOR_PRINT( std::cerr << "ResolveCopyCtors: " << impCpCtorExpr << std::endl; ) |
---|
| 360 | Visitor::visit( impCpCtorExpr ); |
---|
| 361 | env = impCpCtorExpr->get_env(); // xxx - maybe we really should just have a PolyIndexer... |
---|
| 362 | |
---|
| 363 | ApplicationExpr * appExpr = impCpCtorExpr->get_callExpr(); |
---|
| 364 | |
---|
| 365 | // take each argument and attempt to copy construct it. |
---|
| 366 | for ( Expression * & arg : appExpr->get_args() ) { |
---|
| 367 | CP_CTOR_PRINT( std::cerr << "Type Substitution: " << *impCpCtorExpr->get_env() << std::endl; ) |
---|
| 368 | // xxx - need to handle tuple arguments |
---|
| 369 | assert( ! arg->get_results().empty() ); |
---|
| 370 | Type * result = arg->get_results().front(); |
---|
| 371 | if ( skipCopyConstruct( result ) ) continue; // skip certain non-copyable types |
---|
| 372 | // type may involve type variables, so apply type substitution to get temporary variable's actual type |
---|
| 373 | result = result->clone(); |
---|
| 374 | impCpCtorExpr->get_env()->apply( result ); |
---|
| 375 | ObjectDecl * tmp = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, result, 0 ); |
---|
| 376 | tmp->get_type()->set_isConst( false ); |
---|
| 377 | |
---|
| 378 | // create and resolve copy constructor |
---|
| 379 | CP_CTOR_PRINT( std::cerr << "makeCtorDtor for an argument" << std::endl; ) |
---|
| 380 | ApplicationExpr * cpCtor = makeCtorDtor( "?{}", tmp, arg ); |
---|
| 381 | |
---|
| 382 | // if the chosen constructor is intrinsic, the copy is unnecessary, so |
---|
| 383 | // don't create the temporary and don't call the copy constructor |
---|
| 384 | VariableExpr * function = dynamic_cast< VariableExpr * >( cpCtor->get_function() ); |
---|
| 385 | assert( function ); |
---|
| 386 | if ( function->get_var()->get_linkage() != LinkageSpec::Intrinsic ) { |
---|
| 387 | // replace argument to function call with temporary |
---|
| 388 | arg = new CommaExpr( cpCtor, new VariableExpr( tmp ) ); |
---|
| 389 | impCpCtorExpr->get_tempDecls().push_back( tmp ); |
---|
| 390 | impCpCtorExpr->get_dtors().push_front( makeCtorDtor( "^?{}", tmp ) ); |
---|
[adcc065] | 391 | } // if |
---|
| 392 | } // for |
---|
[db4ecc5] | 393 | |
---|
[adcc065] | 394 | // each return value from the call needs to be connected with an ObjectDecl at the call site, which is |
---|
| 395 | // initialized with the return value and is destructed later |
---|
[c2931ea] | 396 | // xxx - handle multiple return values |
---|
| 397 | ApplicationExpr * callExpr = impCpCtorExpr->get_callExpr(); |
---|
[adcc065] | 398 | // xxx - is this right? callExpr may not have the right environment, because it was attached at a higher |
---|
| 399 | // level. Trying to pass that environment along. |
---|
[c2931ea] | 400 | callExpr->set_env( impCpCtorExpr->get_env()->clone() ); |
---|
| 401 | for ( Type * result : appExpr->get_results() ) { |
---|
| 402 | result = result->clone(); |
---|
| 403 | impCpCtorExpr->get_env()->apply( result ); |
---|
| 404 | ObjectDecl * ret = new ObjectDecl( retNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, result, 0 ); |
---|
| 405 | ret->get_type()->set_isConst( false ); |
---|
| 406 | impCpCtorExpr->get_returnDecls().push_back( ret ); |
---|
| 407 | CP_CTOR_PRINT( std::cerr << "makeCtorDtor for a return" << std::endl; ) |
---|
| 408 | impCpCtorExpr->get_dtors().push_front( makeCtorDtor( "^?{}", ret ) ); |
---|
[adcc065] | 409 | } // for |
---|
[c2931ea] | 410 | CP_CTOR_PRINT( std::cerr << "after Resolving: " << impCpCtorExpr << std::endl; ) |
---|
[db4ecc5] | 411 | } |
---|
| 412 | |
---|
| 413 | |
---|
[c2931ea] | 414 | Expression * FixCopyCtors::mutate( ImplicitCopyCtorExpr * impCpCtorExpr ) { |
---|
| 415 | CP_CTOR_PRINT( std::cerr << "FixCopyCtors: " << impCpCtorExpr << std::endl; ) |
---|
| 416 | |
---|
| 417 | impCpCtorExpr = dynamic_cast< ImplicitCopyCtorExpr * >( Mutator::mutate( impCpCtorExpr ) ); |
---|
| 418 | assert( impCpCtorExpr ); |
---|
[db4ecc5] | 419 | |
---|
[c2931ea] | 420 | std::list< ObjectDecl * > & tempDecls = impCpCtorExpr->get_tempDecls(); |
---|
| 421 | std::list< ObjectDecl * > & returnDecls = impCpCtorExpr->get_returnDecls(); |
---|
| 422 | std::list< Expression * > & dtors = impCpCtorExpr->get_dtors(); |
---|
[845cedc] | 423 | |
---|
[c2931ea] | 424 | // add all temporary declarations and their constructors |
---|
| 425 | for ( ObjectDecl * obj : tempDecls ) { |
---|
| 426 | stmtsToAdd.push_back( new DeclStmt( noLabels, obj ) ); |
---|
[adcc065] | 427 | } // for |
---|
[c2931ea] | 428 | for ( ObjectDecl * obj : returnDecls ) { |
---|
| 429 | stmtsToAdd.push_back( new DeclStmt( noLabels, obj ) ); |
---|
[adcc065] | 430 | } // for |
---|
[db4ecc5] | 431 | |
---|
[c2931ea] | 432 | // add destructors after current statement |
---|
| 433 | for ( Expression * dtor : dtors ) { |
---|
| 434 | stmtsToAddAfter.push_back( new ExprStmt( noLabels, dtor ) ); |
---|
[adcc065] | 435 | } // for |
---|
[db4ecc5] | 436 | |
---|
[c2931ea] | 437 | // xxx - update to work with multiple return values |
---|
| 438 | ObjectDecl * returnDecl = returnDecls.empty() ? NULL : returnDecls.front(); |
---|
| 439 | Expression * callExpr = impCpCtorExpr->get_callExpr(); |
---|
| 440 | |
---|
| 441 | CP_CTOR_PRINT( std::cerr << "Coming out the back..." << impCpCtorExpr << std::endl; ) |
---|
| 442 | |
---|
| 443 | // detach fields from wrapper node so that it can be deleted without deleting too much |
---|
| 444 | dtors.clear(); |
---|
| 445 | tempDecls.clear(); |
---|
| 446 | returnDecls.clear(); |
---|
| 447 | impCpCtorExpr->set_callExpr( NULL ); |
---|
| 448 | impCpCtorExpr->set_env( NULL ); |
---|
| 449 | delete impCpCtorExpr; |
---|
| 450 | |
---|
| 451 | if ( returnDecl ) { |
---|
| 452 | UntypedExpr * assign = new UntypedExpr( new NameExpr( "?=?" ) ); |
---|
| 453 | assign->get_args().push_back( new VariableExpr( returnDecl ) ); |
---|
| 454 | assign->get_args().push_back( callExpr ); |
---|
| 455 | // know the result type of the assignment is the type of the LHS (minus the pointer), so |
---|
| 456 | // add that onto the assignment expression so that later steps have the necessary information |
---|
| 457 | assign->add_result( returnDecl->get_type()->clone() ); |
---|
| 458 | |
---|
| 459 | Expression * retExpr = new CommaExpr( assign, new VariableExpr( returnDecl ) ); |
---|
| 460 | if ( callExpr->get_results().front()->get_isLvalue() ) { |
---|
[adcc065] | 461 | // lvalue returning functions are funny. Lvalue.cc inserts a *? in front of any lvalue returning |
---|
| 462 | // non-intrinsic function. Add an AddressExpr to the call to negate the derefence and change the |
---|
| 463 | // type of the return temporary from T to T* to properly capture the return value. Then dereference |
---|
| 464 | // the result of the comma expression, since the lvalue returning call was originally wrapped with |
---|
| 465 | // an AddressExpr. Effectively, this turns |
---|
[c2931ea] | 466 | // lvalue T f(); |
---|
| 467 | // &*f() |
---|
| 468 | // into |
---|
| 469 | // T * tmp_cp_retN; |
---|
| 470 | // tmp_cp_ret_N = &*(tmp_cp_ret_N = &*f(), tmp_cp_ret); |
---|
| 471 | // which work out in terms of types, but is pretty messy. It would be nice to find a better way. |
---|
| 472 | assign->get_args().back() = new AddressExpr( assign->get_args().back() ); |
---|
| 473 | |
---|
| 474 | Type * resultType = returnDecl->get_type()->clone(); |
---|
| 475 | returnDecl->set_type( new PointerType( Type::Qualifiers(), returnDecl->get_type() ) ); |
---|
| 476 | UntypedExpr * deref = new UntypedExpr( new NameExpr( "*?" ) ); |
---|
| 477 | deref->get_args().push_back( retExpr ); |
---|
| 478 | deref->add_result( resultType ); |
---|
| 479 | retExpr = deref; |
---|
[adcc065] | 480 | } // if |
---|
[c2931ea] | 481 | // xxx - might need to set env on retExpr... |
---|
| 482 | // retExpr->set_env( env->clone() ); |
---|
| 483 | return retExpr; |
---|
| 484 | } else { |
---|
| 485 | return callExpr; |
---|
[adcc065] | 486 | } // if |
---|
[4ffdd63] | 487 | } |
---|
[c2931ea] | 488 | |
---|
| 489 | DeclarationWithType *FixInit::mutate( ObjectDecl *objDecl ) { |
---|
[adcc065] | 490 | // first recursively handle pieces of ObjectDecl so that they aren't missed by other visitors when the init |
---|
| 491 | // is removed from the ObjectDecl |
---|
[c2931ea] | 492 | objDecl = dynamic_cast< ObjectDecl * >( Mutator::mutate( objDecl ) ); |
---|
| 493 | |
---|
| 494 | if ( ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ) ) { |
---|
| 495 | // a decision should have been made by the resolver, so ctor and init are not both non-NULL |
---|
| 496 | assert( ! ctorInit->get_ctor() || ! ctorInit->get_init() ); |
---|
| 497 | if ( Statement * ctor = ctorInit->get_ctor() ) { |
---|
| 498 | if ( objDecl->get_storageClass() == DeclarationNode::Static ) { |
---|
[72e9222] | 499 | // originally wanted to take advantage of gcc nested functions, but |
---|
[f9cebb5] | 500 | // we get memory errors with this approach. To remedy this, the static |
---|
| 501 | // variable is hoisted when the destructor needs to be called. |
---|
[72e9222] | 502 | // |
---|
[c2931ea] | 503 | // generate: |
---|
[f9cebb5] | 504 | // static T __objName_static_varN; |
---|
[72e9222] | 505 | // void __objName_dtor_atexitN() { |
---|
[f9cebb5] | 506 | // __dtor__...; |
---|
[72e9222] | 507 | // } |
---|
| 508 | // int f(...) { |
---|
| 509 | // ... |
---|
| 510 | // static bool __objName_uninitialized = true; |
---|
| 511 | // if (__objName_uninitialized) { |
---|
| 512 | // __ctor(__objName); |
---|
| 513 | // __objName_uninitialized = false; |
---|
[f9cebb5] | 514 | // atexit(__objName_dtor_atexitN); |
---|
[c2931ea] | 515 | // } |
---|
[72e9222] | 516 | // ... |
---|
[c2931ea] | 517 | // } |
---|
| 518 | |
---|
[72e9222] | 519 | static UniqueName dtorCallerNamer( "_dtor_atexit" ); |
---|
| 520 | |
---|
| 521 | // static bool __objName_uninitialized = true |
---|
[c2931ea] | 522 | BasicType * boolType = new BasicType( Type::Qualifiers(), BasicType::Bool ); |
---|
| 523 | SingleInit * boolInitExpr = new SingleInit( new ConstantExpr( Constant( boolType->clone(), "1" ) ), noDesignators ); |
---|
| 524 | ObjectDecl * isUninitializedVar = new ObjectDecl( objDecl->get_mangleName() + "_uninitialized", DeclarationNode::Static, LinkageSpec::Cforall, 0, boolType, boolInitExpr ); |
---|
| 525 | isUninitializedVar->fixUniqueId(); |
---|
| 526 | |
---|
| 527 | // __objName_uninitialized = false; |
---|
| 528 | UntypedExpr * setTrue = new UntypedExpr( new NameExpr( "?=?" ) ); |
---|
| 529 | setTrue->get_args().push_back( new VariableExpr( isUninitializedVar ) ); |
---|
| 530 | setTrue->get_args().push_back( new ConstantExpr( Constant( boolType->clone(), "0" ) ) ); |
---|
| 531 | |
---|
| 532 | // generate body of if |
---|
| 533 | CompoundStmt * initStmts = new CompoundStmt( noLabels ); |
---|
| 534 | std::list< Statement * > & body = initStmts->get_kids(); |
---|
| 535 | body.push_back( ctor ); |
---|
| 536 | body.push_back( new ExprStmt( noLabels, setTrue ) ); |
---|
| 537 | |
---|
| 538 | // put it all together |
---|
| 539 | IfStmt * ifStmt = new IfStmt( noLabels, new VariableExpr( isUninitializedVar ), initStmts, 0 ); |
---|
| 540 | stmtsToAddAfter.push_back( new DeclStmt( noLabels, isUninitializedVar ) ); |
---|
| 541 | stmtsToAddAfter.push_back( ifStmt ); |
---|
[72e9222] | 542 | |
---|
[f9cebb5] | 543 | if ( ctorInit->get_dtor() ) { |
---|
| 544 | // if the object has a non-trivial destructor, have to |
---|
| 545 | // hoist it and the object into the global space and |
---|
| 546 | // call the destructor function with atexit. |
---|
| 547 | |
---|
| 548 | Statement * dtorStmt = ctorInit->get_dtor()->clone(); |
---|
| 549 | |
---|
| 550 | // void __objName_dtor_atexitN(...) {...} |
---|
| 551 | FunctionDecl * dtorCaller = new FunctionDecl( objDecl->get_mangleName() + dtorCallerNamer.newName(), DeclarationNode::Static, LinkageSpec::C, new FunctionType( Type::Qualifiers(), false ), new CompoundStmt( noLabels ), false, false ); |
---|
| 552 | dtorCaller->fixUniqueId(); |
---|
[c8dfcd3] | 553 | dtorCaller->get_statements()->push_back( dtorStmt ); |
---|
[f9cebb5] | 554 | |
---|
| 555 | // atexit(dtor_atexit); |
---|
| 556 | UntypedExpr * callAtexit = new UntypedExpr( new NameExpr( "atexit" ) ); |
---|
| 557 | callAtexit->get_args().push_back( new VariableExpr( dtorCaller ) ); |
---|
| 558 | |
---|
| 559 | body.push_back( new ExprStmt( noLabels, callAtexit ) ); |
---|
| 560 | |
---|
| 561 | // hoist variable and dtor caller decls to list of decls that will be added into global scope |
---|
| 562 | staticDtorDecls.push_back( objDecl ); |
---|
| 563 | staticDtorDecls.push_back( dtorCaller ); |
---|
| 564 | |
---|
| 565 | // need to rename object uniquely since it now appears |
---|
| 566 | // at global scope and there could be multiple function-scoped |
---|
| 567 | // static variables with the same name in different functions. |
---|
[c8dfcd3] | 568 | // Note: it isn't sufficient to modify only the mangleName, because |
---|
| 569 | // then subsequent Indexer passes can choke on seeing the object's name |
---|
| 570 | // if another object has the same name and type. An unfortunate side-effect |
---|
| 571 | // of renaming the object is that subsequent NameExprs may fail to resolve, |
---|
| 572 | // but there shouldn't be any remaining past this point. |
---|
[f9cebb5] | 573 | static UniqueName staticNamer( "_static_var" ); |
---|
[c8dfcd3] | 574 | objDecl->set_name( objDecl->get_name() + staticNamer.newName() ); |
---|
| 575 | objDecl->set_mangleName( SymTab::Mangler::mangle( objDecl ) ); |
---|
[f9cebb5] | 576 | |
---|
| 577 | objDecl->set_init( NULL ); |
---|
| 578 | ctorInit->set_ctor( NULL ); |
---|
| 579 | delete ctorInit; |
---|
| 580 | |
---|
| 581 | // xxx - temporary hack: need to return a declaration, but want to hoist the current object out of this scope |
---|
| 582 | // create a new object which is never used |
---|
| 583 | static UniqueName dummyNamer( "_dummy" ); |
---|
| 584 | ObjectDecl * dummy = new ObjectDecl( dummyNamer.newName(), DeclarationNode::Static, LinkageSpec::Cforall, 0, new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ), 0, std::list< Attribute * >{ new Attribute("unused") } ); |
---|
| 585 | return dummy; |
---|
| 586 | } |
---|
[c2931ea] | 587 | } else { |
---|
| 588 | stmtsToAddAfter.push_back( ctor ); |
---|
[adcc065] | 589 | } // if |
---|
[c2931ea] | 590 | objDecl->set_init( NULL ); |
---|
| 591 | ctorInit->set_ctor( NULL ); |
---|
| 592 | } else if ( Initializer * init = ctorInit->get_init() ) { |
---|
| 593 | objDecl->set_init( init ); |
---|
| 594 | ctorInit->set_init( NULL ); |
---|
| 595 | } else { |
---|
| 596 | // no constructor and no initializer, which is okay |
---|
| 597 | objDecl->set_init( NULL ); |
---|
[adcc065] | 598 | } // if |
---|
[c2931ea] | 599 | delete ctorInit; |
---|
[adcc065] | 600 | } // if |
---|
[c2931ea] | 601 | return objDecl; |
---|
[db4ecc5] | 602 | } |
---|
| 603 | |
---|
[c2931ea] | 604 | void ObjDeclCollector::visit( CompoundStmt *compoundStmt ) { |
---|
| 605 | std::set< ObjectDecl * > prevVars = curVars; |
---|
| 606 | Parent::visit( compoundStmt ); |
---|
| 607 | curVars = prevVars; |
---|
[db4ecc5] | 608 | } |
---|
| 609 | |
---|
[c2931ea] | 610 | void ObjDeclCollector::visit( DeclStmt *stmt ) { |
---|
[4b2589a] | 611 | // keep track of all variables currently in scope |
---|
[c2931ea] | 612 | if ( ObjectDecl * objDecl = dynamic_cast< ObjectDecl * > ( stmt->get_decl() ) ) { |
---|
| 613 | curVars.insert( objDecl ); |
---|
[adcc065] | 614 | } // if |
---|
[e39aa0f] | 615 | Parent::visit( stmt ); |
---|
[db4ecc5] | 616 | } |
---|
| 617 | |
---|
[c2931ea] | 618 | void LabelFinder::handleStmt( Statement * stmt ) { |
---|
[4b2589a] | 619 | // for each label, remember the variables in scope at that label. |
---|
[c2931ea] | 620 | for ( Label l : stmt->get_labels() ) { |
---|
| 621 | vars[l] = curVars; |
---|
[adcc065] | 622 | } // for |
---|
[71f4e4f] | 623 | } |
---|
[f1e012b] | 624 | |
---|
[ec79847] | 625 | template<typename Iterator, typename OutputIterator> |
---|
| 626 | void insertDtors( Iterator begin, Iterator end, OutputIterator out ) { |
---|
| 627 | for ( Iterator it = begin ; it != end ; ++it ) { |
---|
[adcc065] | 628 | // extract destructor statement from the object decl and insert it into the output. Note that this is |
---|
| 629 | // only called on lists of non-static objects with implicit non-intrinsic dtors, so if the user manually |
---|
| 630 | // calls an intrinsic dtor then the call must (and will) still be generated since the argument may |
---|
| 631 | // contain side effects. |
---|
[c2931ea] | 632 | ObjectDecl * objDecl = *it; |
---|
| 633 | ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ); |
---|
| 634 | assert( ctorInit && ctorInit->get_dtor() ); |
---|
| 635 | *out++ = ctorInit->get_dtor()->clone(); |
---|
[adcc065] | 636 | } // for |
---|
[f1e012b] | 637 | } |
---|
[39786813] | 638 | |
---|
[c2931ea] | 639 | void InsertDtors::visit( ObjectDecl * objDecl ) { |
---|
| 640 | // remember non-static destructed objects so that their destructors can be inserted later |
---|
| 641 | if ( objDecl->get_storageClass() != DeclarationNode::Static ) { |
---|
| 642 | if ( ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ) ) { |
---|
| 643 | // a decision should have been made by the resolver, so ctor and init are not both non-NULL |
---|
| 644 | assert( ! ctorInit->get_ctor() || ! ctorInit->get_init() ); |
---|
| 645 | Statement * dtor = ctorInit->get_dtor(); |
---|
[f9cebb5] | 646 | if ( dtor && ! isIntrinsicSingleArgCallStmt( dtor ) ) { |
---|
[c2931ea] | 647 | // don't need to call intrinsic dtor, because it does nothing, but |
---|
| 648 | // non-intrinsic dtors must be called |
---|
| 649 | reverseDeclOrder.front().push_front( objDecl ); |
---|
[adcc065] | 650 | } // if |
---|
| 651 | } // if |
---|
| 652 | } // if |
---|
[c2931ea] | 653 | Parent::visit( objDecl ); |
---|
| 654 | } |
---|
[39786813] | 655 | |
---|
[c2931ea] | 656 | void InsertDtors::visit( CompoundStmt * compoundStmt ) { |
---|
[adcc065] | 657 | // visit statements - this will also populate reverseDeclOrder list. don't want to dump all destructors |
---|
| 658 | // when block is left, just the destructors associated with variables defined in this block, so push a new |
---|
| 659 | // list to the top of the stack so that we can differentiate scopes |
---|
[c2931ea] | 660 | reverseDeclOrder.push_front( OrderedDecls() ); |
---|
| 661 | Parent::visit( compoundStmt ); |
---|
[39786813] | 662 | |
---|
[4b2589a] | 663 | // add destructors for the current scope that we're exiting |
---|
[c2931ea] | 664 | std::list< Statement * > & statements = compoundStmt->get_kids(); |
---|
| 665 | insertDtors( reverseDeclOrder.front().begin(), reverseDeclOrder.front().end(), back_inserter( statements ) ); |
---|
| 666 | reverseDeclOrder.pop_front(); |
---|
[39786813] | 667 | } |
---|
| 668 | |
---|
[c2931ea] | 669 | void InsertDtors::visit( ReturnStmt * returnStmt ) { |
---|
[4b2589a] | 670 | // return exits all scopes, so dump destructors for all scopes |
---|
[c2931ea] | 671 | for ( OrderedDecls & od : reverseDeclOrder ) { |
---|
| 672 | insertDtors( od.begin(), od.end(), back_inserter( stmtsToAdd ) ); |
---|
[adcc065] | 673 | } // for |
---|
[39786813] | 674 | } |
---|
[f1e012b] | 675 | |
---|
[adcc065] | 676 | // Handle break/continue/goto in the same manner as C++. Basic idea: any objects that are in scope at the |
---|
| 677 | // BranchStmt but not at the labelled (target) statement must be destructed. If there are any objects in scope |
---|
| 678 | // at the target location but not at the BranchStmt then those objects would be uninitialized so notify the user |
---|
| 679 | // of the error. See C++ Reference 6.6 Jump Statements for details. |
---|
[c2931ea] | 680 | void InsertDtors::handleGoto( BranchStmt * stmt ) { |
---|
[e39aa0f] | 681 | assert( stmt->get_target() != "" && "BranchStmt missing a label" ); |
---|
[c2931ea] | 682 | // S_L = lvars = set of objects in scope at label definition |
---|
| 683 | // S_G = curVars = set of objects in scope at goto statement |
---|
| 684 | ObjectSet & lvars = labelVars[ stmt->get_target() ]; |
---|
| 685 | |
---|
| 686 | DTOR_PRINT( |
---|
| 687 | std::cerr << "at goto label: " << stmt->get_target().get_name() << std::endl; |
---|
| 688 | std::cerr << "S_G = " << printSet( curVars ) << std::endl; |
---|
| 689 | std::cerr << "S_L = " << printSet( lvars ) << std::endl; |
---|
| 690 | ) |
---|
| 691 | |
---|
| 692 | ObjectSet diff; |
---|
| 693 | // S_L-S_G results in set of objects whose construction is skipped - it's an error if this set is non-empty |
---|
| 694 | std::set_difference( lvars.begin(), lvars.end(), curVars.begin(), curVars.end(), std::inserter( diff, diff.begin() ) ); |
---|
| 695 | DTOR_PRINT( |
---|
| 696 | std::cerr << "S_L-S_G = " << printSet( diff ) << std::endl; |
---|
| 697 | ) |
---|
| 698 | if ( ! diff.empty() ) { |
---|
| 699 | throw SemanticError( std::string("jump to label '") + stmt->get_target().get_name() + "' crosses initialization of " + (*diff.begin())->get_name() + " ", stmt ); |
---|
[adcc065] | 700 | } // if |
---|
[c2931ea] | 701 | // S_G-S_L results in set of objects that must be destructed |
---|
| 702 | diff.clear(); |
---|
| 703 | std::set_difference( curVars.begin(), curVars.end(), lvars.begin(), lvars.end(), std::inserter( diff, diff.end() ) ); |
---|
| 704 | DTOR_PRINT( |
---|
| 705 | std::cerr << "S_G-S_L = " << printSet( diff ) << std::endl; |
---|
| 706 | ) |
---|
| 707 | if ( ! diff.empty() ) { |
---|
| 708 | // go through decl ordered list of objectdecl. for each element that occurs in diff, output destructor |
---|
| 709 | OrderedDecls ordered; |
---|
| 710 | for ( OrderedDecls & rdo : reverseDeclOrder ) { |
---|
| 711 | // add elements from reverseDeclOrder into ordered if they occur in diff - it is key that this happens in reverse declaration order. |
---|
| 712 | copy_if( rdo.begin(), rdo.end(), back_inserter( ordered ), [&]( ObjectDecl * objDecl ) { return diff.count( objDecl ); } ); |
---|
[adcc065] | 713 | } // for |
---|
[c2931ea] | 714 | insertDtors( ordered.begin(), ordered.end(), back_inserter( stmtsToAdd ) ); |
---|
[adcc065] | 715 | } // if |
---|
[c2931ea] | 716 | } |
---|
[39786813] | 717 | |
---|
[c2931ea] | 718 | void InsertDtors::visit( BranchStmt * stmt ) { |
---|
| 719 | switch( stmt->get_type() ) { |
---|
[adcc065] | 720 | case BranchStmt::Continue: |
---|
| 721 | case BranchStmt::Break: |
---|
| 722 | // could optimize the break/continue case, because the S_L-S_G check is unnecessary (this set should |
---|
| 723 | // always be empty), but it serves as a small sanity check. |
---|
| 724 | case BranchStmt::Goto: |
---|
| 725 | handleGoto( stmt ); |
---|
| 726 | break; |
---|
| 727 | default: |
---|
| 728 | assert( false ); |
---|
| 729 | } // switch |
---|
[c2931ea] | 730 | } |
---|
[79970ed] | 731 | |
---|
| 732 | bool checkWarnings( FunctionDecl * funcDecl ) { |
---|
| 733 | // only check for warnings if the current function is a user-defined |
---|
| 734 | // constructor or destructor |
---|
| 735 | if ( ! funcDecl ) return false; |
---|
| 736 | if ( ! funcDecl->get_statements() ) return false; |
---|
| 737 | return isCtorDtor( funcDecl->get_name() ) && ! LinkageSpec::isOverridable( funcDecl->get_linkage() ); |
---|
| 738 | } |
---|
| 739 | |
---|
[c8dfcd3] | 740 | void GenStructMemberCalls::visit( FunctionDecl * funcDecl ) { |
---|
| 741 | ValueGuard< FunctionDecl * > oldFunction( funcDecl ); |
---|
| 742 | ValueGuard< std::set< DeclarationWithType * > > oldUnhandled( unhandled ); |
---|
| 743 | ValueGuard< std::set< DeclarationWithType * > > oldUsedUninit( usedUninit ); |
---|
| 744 | ValueGuard< ObjectDecl * > oldThisParam( thisParam ); |
---|
| 745 | ValueGuard< bool > oldIsCtor( isCtor ); |
---|
| 746 | |
---|
| 747 | // need to start with fresh sets |
---|
| 748 | unhandled.clear(); |
---|
| 749 | usedUninit.clear(); |
---|
[79970ed] | 750 | |
---|
| 751 | function = funcDecl; |
---|
[c8dfcd3] | 752 | isCtor = isConstructor( function->get_name() ); |
---|
| 753 | if ( checkWarnings( function ) ) { |
---|
| 754 | FunctionType * type = function->get_functionType(); |
---|
[79970ed] | 755 | assert( ! type->get_parameters().empty() ); |
---|
| 756 | thisParam = safe_dynamic_cast< ObjectDecl * >( type->get_parameters().front() ); |
---|
| 757 | PointerType * ptrType = safe_dynamic_cast< PointerType * > ( thisParam->get_type() ); |
---|
| 758 | StructInstType * structType = dynamic_cast< StructInstType * >( ptrType->get_base() ); |
---|
| 759 | if ( structType ) { |
---|
| 760 | StructDecl * structDecl = structType->get_baseStruct(); |
---|
| 761 | for ( Declaration * member : structDecl->get_members() ) { |
---|
| 762 | if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( member ) ) { |
---|
| 763 | // record all of the struct type's members that need to be constructed or |
---|
| 764 | // destructed by the end of the function |
---|
| 765 | unhandled.insert( field ); |
---|
| 766 | } |
---|
| 767 | } |
---|
| 768 | } |
---|
| 769 | } |
---|
[c8dfcd3] | 770 | Parent::visit( function ); |
---|
| 771 | |
---|
| 772 | // remove the unhandled objects from usedUninit, because a call is inserted |
---|
| 773 | // to handle them - only objects that are later constructed are used uninitialized. |
---|
| 774 | std::set< DeclarationWithType * > diff; |
---|
| 775 | std::set_difference( usedUninit.begin(), usedUninit.end(), unhandled.begin(), unhandled.end(), std::inserter( diff, diff.begin() ) ); |
---|
| 776 | for ( DeclarationWithType * member : diff ) { |
---|
| 777 | emit( "in ", CodeGen::genType( function->get_functionType(), function->get_name(), false ), ", member ", member->get_name(), " used before being constructed" ); |
---|
[79970ed] | 778 | } |
---|
| 779 | |
---|
[c8dfcd3] | 780 | if ( ! unhandled.empty() ) { |
---|
| 781 | // need to explicitly re-add function parameters in order to resolve copy constructors |
---|
| 782 | enterScope(); |
---|
| 783 | // maybeAccept( function->get_functionType(), *this ); |
---|
| 784 | for ( DeclarationWithType * member : unhandled ) { |
---|
| 785 | // insert and resolve default/copy constructor call for each member that's unhandled |
---|
| 786 | std::list< Statement * > stmt; |
---|
| 787 | UntypedExpr * deref = new UntypedExpr( new NameExpr( "*?" ) ); |
---|
| 788 | deref->get_args().push_back( new VariableExpr( thisParam ) ); |
---|
| 789 | InitExpander srcParam( (Initializer *)NULL ); // xxx - if copy ctor, need to pass appropriate argument - second param of this function dot member |
---|
| 790 | SymTab::genImplicitCall( srcParam, new MemberExpr( member, deref ), function->get_name(), back_inserter( stmt ), member, isCtor ); |
---|
| 791 | |
---|
| 792 | assert( stmt.size() <= 1 ); |
---|
| 793 | if ( stmt.size() == 1 ) { |
---|
| 794 | Statement * callStmt = stmt.front(); |
---|
| 795 | |
---|
| 796 | MutatingResolver resolver( *this ); |
---|
| 797 | try { |
---|
| 798 | // xxx - these should be in field declaration order |
---|
| 799 | callStmt->acceptMutator( resolver ); |
---|
| 800 | if ( isCtor ) { |
---|
| 801 | function->get_statements()->push_front( callStmt ); |
---|
| 802 | } else { |
---|
| 803 | // destructor statements should be added at the end |
---|
| 804 | function->get_statements()->push_back( callStmt ); |
---|
| 805 | } |
---|
| 806 | } catch ( SemanticError & error ) { |
---|
| 807 | emit( "in ", CodeGen::genType( function->get_functionType(), function->get_name(), false ), ", member ", member->get_name(), " not explicitly ", isCtor ? "constructed" : "destructed", " and no ", isCtor ? "default constructor" : "destructor", " found" ); |
---|
| 808 | } |
---|
| 809 | } |
---|
| 810 | } |
---|
| 811 | leaveScope(); |
---|
| 812 | } |
---|
[79970ed] | 813 | } |
---|
| 814 | |
---|
[c8dfcd3] | 815 | void GenStructMemberCalls::visit( ApplicationExpr * appExpr ) { |
---|
[79970ed] | 816 | if ( ! checkWarnings( function ) ) return; |
---|
| 817 | |
---|
| 818 | std::string fname = getFunctionName( appExpr ); |
---|
| 819 | if ( fname == function->get_name() ) { |
---|
| 820 | // call to same kind of function |
---|
| 821 | Expression * firstParam = appExpr->get_args().front(); |
---|
| 822 | |
---|
| 823 | if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( firstParam ) ) { |
---|
| 824 | // if calling another constructor on thisParam, assume that function handles |
---|
| 825 | // all members - if it doesn't a warning will appear in that function. |
---|
| 826 | if ( varExpr->get_var() == thisParam ) { |
---|
| 827 | unhandled.clear(); |
---|
| 828 | } |
---|
| 829 | } else { |
---|
| 830 | // if first parameter is a member expression then |
---|
| 831 | // remove the member from unhandled set. |
---|
| 832 | handleFirstParam( firstParam ); |
---|
| 833 | } |
---|
| 834 | } else if ( fname == "?=?" && isIntrinsicCallExpr( appExpr ) ) { |
---|
| 835 | // forgive use of intrinsic assignment to construct, since instrinsic constructors |
---|
| 836 | // codegen as assignment anyway. |
---|
| 837 | assert( appExpr->get_args().size() == 2 ); |
---|
| 838 | handleFirstParam( appExpr->get_args().front() ); |
---|
| 839 | } |
---|
| 840 | |
---|
| 841 | Parent::visit( appExpr ); |
---|
| 842 | } |
---|
| 843 | |
---|
[c8dfcd3] | 844 | void GenStructMemberCalls::handleFirstParam( Expression * firstParam ) { |
---|
[79970ed] | 845 | using namespace std; |
---|
| 846 | if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( firstParam ) ) { |
---|
| 847 | if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( addrExpr->get_arg() ) ) { |
---|
| 848 | if ( ApplicationExpr * deref = dynamic_cast< ApplicationExpr * >( memberExpr->get_aggregate() ) ) { |
---|
| 849 | if ( getFunctionName( deref ) == "*?" && deref->get_args().size() == 1 ) { |
---|
| 850 | if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( deref->get_args().front() ) ) { |
---|
| 851 | if ( varExpr->get_var() == thisParam ) { |
---|
| 852 | unhandled.erase( memberExpr->get_member() ); |
---|
| 853 | } |
---|
| 854 | } |
---|
| 855 | } |
---|
| 856 | } |
---|
| 857 | } |
---|
| 858 | } |
---|
| 859 | } |
---|
| 860 | |
---|
[c8dfcd3] | 861 | void GenStructMemberCalls::visit( MemberExpr * memberExpr ) { |
---|
[79970ed] | 862 | if ( ! checkWarnings( function ) ) return; |
---|
[c8dfcd3] | 863 | if ( ! isCtor ) return; |
---|
[79970ed] | 864 | |
---|
| 865 | if ( ApplicationExpr * deref = dynamic_cast< ApplicationExpr * >( memberExpr->get_aggregate() ) ) { |
---|
| 866 | if ( getFunctionName( deref ) == "*?" && deref->get_args().size() == 1 ) { |
---|
| 867 | if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( deref->get_args().front() ) ) { |
---|
| 868 | if ( varExpr->get_var() == thisParam ) { |
---|
| 869 | if ( unhandled.count( memberExpr->get_member() ) ) { |
---|
| 870 | // emit a warning because a member was used before it was constructed |
---|
[c8dfcd3] | 871 | usedUninit.insert( memberExpr->get_member() ); |
---|
[79970ed] | 872 | } |
---|
| 873 | } |
---|
| 874 | } |
---|
| 875 | } |
---|
| 876 | } |
---|
| 877 | Parent::visit( memberExpr ); |
---|
| 878 | } |
---|
[3906301] | 879 | |
---|
| 880 | template< typename Visitor, typename... Params > |
---|
| 881 | void error( Visitor & v, const Params &... params ) { |
---|
| 882 | v.errors.append( toString( params... ) ); |
---|
| 883 | } |
---|
| 884 | |
---|
| 885 | template< typename... Params > |
---|
[c8dfcd3] | 886 | void GenStructMemberCalls::emit( const Params &... params ) { |
---|
[3906301] | 887 | // toggle warnings vs. errors here. |
---|
| 888 | // warn( params... ); |
---|
| 889 | error( *this, params... ); |
---|
| 890 | } |
---|
[c8dfcd3] | 891 | |
---|
| 892 | DeclarationWithType * MutatingResolver::mutate( ObjectDecl *objectDecl ) { |
---|
| 893 | // add object to the indexer assumes that there will be no name collisions |
---|
| 894 | // in generated code. If this changes, add mutate methods for entities with |
---|
| 895 | // scope and call {enter,leave}Scope explicitly. |
---|
| 896 | objectDecl->accept( indexer ); |
---|
| 897 | return objectDecl; |
---|
| 898 | } |
---|
| 899 | |
---|
| 900 | Expression* MutatingResolver::mutate( UntypedExpr *untypedExpr ) { |
---|
| 901 | return safe_dynamic_cast< ApplicationExpr * >( ResolvExpr::findVoidExpression( untypedExpr, indexer ) ); |
---|
| 902 | } |
---|
[c2931ea] | 903 | } // namespace |
---|
[71f4e4f] | 904 | } // namespace InitTweak |
---|
| 905 | |
---|
| 906 | // Local Variables: // |
---|
| 907 | // tab-width: 4 // |
---|
| 908 | // mode: c++ // |
---|
| 909 | // compile-command: "make install" // |
---|
| 910 | // End: // |
---|