Changeset fc12f05 for src/InitTweak/InitTweak.cc
- Timestamp:
- Nov 13, 2023, 3:43:43 AM (23 months ago)
- Branches:
- master
- Children:
- 25f2798
- Parents:
- 0030b508 (diff), 2174191 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the(diff)
links above to see all the changes relative to each parent. - File:
-
- 1 edited
Legend:
- Unmodified
- Added
- Removed
-
src/InitTweak/InitTweak.cc
r0030b508 rfc12f05 29 29 #include "AST/Type.hpp" 30 30 #include "CodeGen/OperatorTable.h" // for isConstructor, isDestructor, isCto... 31 #include "Common/PassVisitor.h"32 31 #include "Common/SemanticError.h" // for SemanticError 33 32 #include "Common/UniqueName.h" // for UniqueName … … 36 35 #include "InitTweak.h" 37 36 #include "ResolvExpr/Unify.h" // for typesCompatibleIgnoreQualifiers 38 #include "SymTab/Autogen.h"39 #include "SymTab/Indexer.h" // for Indexer40 #include "SynTree/LinkageSpec.h" // for Spec, isBuiltin, Intrinsic41 #include "SynTree/Attribute.h" // for Attribute42 #include "SynTree/Constant.h" // for Constant43 #include "SynTree/Declaration.h" // for ObjectDecl, DeclarationWithType44 #include "SynTree/Expression.h" // for Expression, UntypedExpr, Applicati...45 #include "SynTree/Initializer.h" // for Initializer, ListInit, Designation46 #include "SynTree/Label.h" // for Label47 #include "SynTree/Statement.h" // for CompoundStmt, ExprStmt, BranchStmt48 #include "SynTree/Type.h" // for FunctionType, ArrayType, PointerType49 #include "SynTree/Visitor.h" // for Visitor, maybeAccept50 37 #include "Tuples/Tuples.h" // for Tuples::isTtype 51 38 52 39 namespace InitTweak { 53 40 namespace { 54 struct HasDesignations : public WithShortCircuiting {55 bool hasDesignations = false;56 57 void previsit( BaseSyntaxNode * ) {58 // short circuit if we already know there are designations59 if ( hasDesignations ) visit_children = false;60 }61 62 void previsit( Designation * des ) {63 // short circuit if we already know there are designations64 if ( hasDesignations ) visit_children = false;65 else if ( ! des->get_designators().empty() ) {66 hasDesignations = true;67 visit_children = false;68 }69 }70 };71 72 struct InitDepthChecker : public WithGuards {73 bool depthOkay = true;74 Type * type;75 int curDepth = 0, maxDepth = 0;76 InitDepthChecker( Type * type ) : type( type ) {77 Type * t = type;78 while ( ArrayType * at = dynamic_cast< ArrayType * >( t ) ) {79 maxDepth++;80 t = at->get_base();81 }82 maxDepth++;83 }84 void previsit( ListInit * ) {85 curDepth++;86 GuardAction( [this]() { curDepth--; } );87 if ( curDepth > maxDepth ) depthOkay = false;88 }89 };90 91 41 struct HasDesignations_new : public ast::WithShortCircuiting { 92 42 bool result = false; … … 107 57 }; 108 58 109 struct InitDepthChecker_new : public ast::WithGuards{59 struct InitDepthChecker_new { 110 60 bool result = true; 111 61 const ast::Type * type; … … 119 69 maxDepth++; 120 70 } 121 void previsit( ListInit * ) {71 void previsit( ast::ListInit const * ) { 122 72 curDepth++; 123 GuardAction( [this]() { curDepth--; } );124 73 if ( curDepth > maxDepth ) result = false; 125 74 } 126 }; 127 128 struct InitFlattener_old : public WithShortCircuiting { 129 void previsit( SingleInit * singleInit ) { 130 visit_children = false; 131 argList.push_back( singleInit->value->clone() ); 132 } 133 std::list< Expression * > argList; 75 void postvisit( ast::ListInit const * ) { 76 curDepth--; 77 } 134 78 }; 135 79 … … 144 88 145 89 } // anonymous namespace 146 147 std::list< Expression * > makeInitList( Initializer * init ) {148 PassVisitor<InitFlattener_old> flattener;149 maybeAccept( init, flattener );150 return flattener.pass.argList;151 }152 153 bool isDesignated( Initializer * init ) {154 PassVisitor<HasDesignations> finder;155 maybeAccept( init, finder );156 return finder.pass.hasDesignations;157 }158 159 bool checkInitDepth( ObjectDecl * objDecl ) {160 PassVisitor<InitDepthChecker> checker( objDecl->type );161 maybeAccept( objDecl->init, checker );162 return checker.pass.depthOkay;163 }164 90 165 91 bool isDesignated( const ast::Init * init ) { … … 180 106 return std::move( flattener.core.argList ); 181 107 } 182 183 class InitExpander_old::ExpanderImpl {184 public:185 virtual ~ExpanderImpl() = default;186 virtual std::list< Expression * > next( std::list< Expression * > & indices ) = 0;187 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices ) = 0;188 };189 190 class InitImpl_old : public InitExpander_old::ExpanderImpl {191 public:192 InitImpl_old( Initializer * init ) : init( init ) {}193 virtual ~InitImpl_old() = default;194 195 virtual std::list< Expression * > next( __attribute((unused)) std::list< Expression * > & indices ) {196 // this is wrong, but just a placeholder for now197 // if ( ! flattened ) flatten( indices );198 // return ! inits.empty() ? makeInitList( inits.front() ) : std::list< Expression * >();199 return makeInitList( init );200 }201 202 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices );203 private:204 Initializer * init;205 };206 207 class ExprImpl_old : public InitExpander_old::ExpanderImpl {208 public:209 ExprImpl_old( Expression * expr ) : arg( expr ) {}210 virtual ~ExprImpl_old() { delete arg; }211 212 virtual std::list< Expression * > next( std::list< Expression * > & indices ) {213 std::list< Expression * > ret;214 Expression * expr = maybeClone( arg );215 if ( expr ) {216 for ( std::list< Expression * >::reverse_iterator it = indices.rbegin(); it != indices.rend(); ++it ) {217 // go through indices and layer on subscript exprs ?[?]218 ++it;219 UntypedExpr * subscriptExpr = new UntypedExpr( new NameExpr( "?[?]") );220 subscriptExpr->get_args().push_back( expr );221 subscriptExpr->get_args().push_back( (*it)->clone() );222 expr = subscriptExpr;223 }224 ret.push_back( expr );225 }226 return ret;227 }228 229 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices );230 private:231 Expression * arg;232 };233 234 InitExpander_old::InitExpander_old( Initializer * init ) : expander( new InitImpl_old( init ) ) {}235 236 InitExpander_old::InitExpander_old( Expression * expr ) : expander( new ExprImpl_old( expr ) ) {}237 238 std::list< Expression * > InitExpander_old::operator*() {239 return cur;240 }241 242 InitExpander_old & InitExpander_old::operator++() {243 cur = expander->next( indices );244 return *this;245 }246 247 // use array indices list to build switch statement248 void InitExpander_old::addArrayIndex( Expression * index, Expression * dimension ) {249 indices.push_back( index );250 indices.push_back( dimension );251 }252 253 void InitExpander_old::clearArrayIndices() {254 deleteAll( indices );255 indices.clear();256 }257 258 bool InitExpander_old::addReference() {259 bool added = false;260 for ( Expression *& expr : cur ) {261 expr = new AddressExpr( expr );262 added = true;263 }264 return added;265 }266 267 namespace {268 /// given index i, dimension d, initializer init, and callExpr f, generates269 /// if (i < d) f(..., init)270 /// ++i;271 /// so that only elements within the range of the array are constructed272 template< typename OutIterator >273 void buildCallExpr( UntypedExpr * callExpr, Expression * index, Expression * dimension, Initializer * init, OutIterator out ) {274 UntypedExpr * cond = new UntypedExpr( new NameExpr( "?<?") );275 cond->get_args().push_back( index->clone() );276 cond->get_args().push_back( dimension->clone() );277 278 std::list< Expression * > args = makeInitList( init );279 callExpr->get_args().splice( callExpr->get_args().end(), args );280 281 *out++ = new IfStmt( cond, new ExprStmt( callExpr ), nullptr );282 283 UntypedExpr * increment = new UntypedExpr( new NameExpr( "++?" ) );284 increment->get_args().push_back( index->clone() );285 *out++ = new ExprStmt( increment );286 }287 288 template< typename OutIterator >289 void build( UntypedExpr * callExpr, InitExpander_old::IndexList::iterator idx, InitExpander_old::IndexList::iterator idxEnd, Initializer * init, OutIterator out ) {290 if ( idx == idxEnd ) return;291 Expression * index = *idx++;292 assert( idx != idxEnd );293 Expression * dimension = *idx++;294 295 // xxx - may want to eventually issue a warning here if we can detect296 // that the number of elements exceeds to dimension of the array297 if ( idx == idxEnd ) {298 if ( ListInit * listInit = dynamic_cast< ListInit * >( init ) ) {299 for ( Initializer * init : *listInit ) {300 buildCallExpr( callExpr->clone(), index, dimension, init, out );301 }302 } else {303 buildCallExpr( callExpr->clone(), index, dimension, init, out );304 }305 } else {306 std::list< Statement * > branches;307 308 unsigned long cond = 0;309 ListInit * listInit = dynamic_cast< ListInit * >( init );310 if ( ! listInit ) {311 // xxx - this shouldn't be an error, but need a way to312 // terminate without creating output, so should catch this error313 SemanticError( init->location, "unbalanced list initializers" );314 }315 316 static UniqueName targetLabel( "L__autogen__" );317 Label switchLabel( targetLabel.newName(), 0, std::list< Attribute * >{ new Attribute("unused") } );318 for ( Initializer * init : *listInit ) {319 Expression * condition;320 // check for designations321 // if ( init-> ) {322 condition = new ConstantExpr( Constant::from_ulong( cond ) );323 ++cond;324 // } else {325 // condition = // ... take designation326 // cond = // ... take designation+1327 // }328 std::list< Statement * > stmts;329 build( callExpr, idx, idxEnd, init, back_inserter( stmts ) );330 stmts.push_back( new BranchStmt( switchLabel, BranchStmt::Break ) );331 CaseStmt * caseStmt = new CaseStmt( condition, stmts );332 branches.push_back( caseStmt );333 }334 *out++ = new SwitchStmt( index->clone(), branches );335 *out++ = new NullStmt( { switchLabel } );336 }337 }338 }339 340 // if array came with an initializer list: initialize each element341 // may have more initializers than elements in the array - need to check at each index that342 // we haven't exceeded size.343 // may have fewer initializers than elements in the array - need to default construct344 // remaining elements.345 // To accomplish this, generate switch statement, consuming all of expander's elements346 Statement * InitImpl_old::buildListInit( UntypedExpr * dst, std::list< Expression * > & indices ) {347 if ( ! init ) return nullptr;348 CompoundStmt * block = new CompoundStmt();349 build( dst, indices.begin(), indices.end(), init, back_inserter( block->get_kids() ) );350 if ( block->get_kids().empty() ) {351 delete block;352 return nullptr;353 } else {354 init = nullptr; // init was consumed in creating the list init355 return block;356 }357 }358 359 Statement * ExprImpl_old::buildListInit( UntypedExpr *, std::list< Expression * > & ) {360 return nullptr;361 }362 363 Statement * InitExpander_old::buildListInit( UntypedExpr * dst ) {364 return expander->buildListInit( dst, indices );365 }366 108 367 109 class InitExpander_new::ExpanderImpl { … … 535 277 } 536 278 537 Type * getTypeofThis( FunctionType * ftype ) {538 assertf( ftype, "getTypeofThis: nullptr ftype" );539 ObjectDecl * thisParam = getParamThis( ftype );540 ReferenceType * refType = strict_dynamic_cast< ReferenceType * >( thisParam->type );541 return refType->base;542 }543 544 279 const ast::Type * getTypeofThis( const ast::FunctionType * ftype ) { 545 280 assertf( ftype, "getTypeofThis: nullptr ftype" ); … … 552 287 } 553 288 554 ObjectDecl * getParamThis( FunctionType * ftype ) {555 assertf( ftype, "getParamThis: nullptr ftype" );556 auto & params = ftype->parameters;557 assertf( ! params.empty(), "getParamThis: ftype with 0 parameters: %s", toString( ftype ).c_str() );558 return strict_dynamic_cast< ObjectDecl * >( params.front() );559 }560 561 289 const ast::ObjectDecl * getParamThis(const ast::FunctionDecl * func) { 562 290 assertf( func, "getParamThis: nullptr ftype" ); … … 564 292 assertf( ! params.empty(), "getParamThis: ftype with 0 parameters: %s", toString( func ).c_str()); 565 293 return params.front().strict_as<ast::ObjectDecl>(); 566 }567 568 bool tryConstruct( DeclarationWithType * dwt ) {569 ObjectDecl * objDecl = dynamic_cast< ObjectDecl * >( dwt );570 if ( ! objDecl ) return false;571 return (objDecl->get_init() == nullptr ||572 ( objDecl->get_init() != nullptr && objDecl->get_init()->get_maybeConstructed() ))573 && ! objDecl->get_storageClasses().is_extern574 && isConstructable( objDecl->type );575 }576 577 bool isConstructable( Type * type ) {578 return ! dynamic_cast< VarArgsType * >( type ) && ! dynamic_cast< ReferenceType * >( type ) && ! dynamic_cast< FunctionType * >( type ) && ! Tuples::isTtype( type );579 294 } 580 295 … … 593 308 } 594 309 595 struct CallFinder_old {596 CallFinder_old( const std::list< std::string > & names ) : names( names ) {}597 598 void postvisit( ApplicationExpr * appExpr ) {599 handleCallExpr( appExpr );600 }601 602 void postvisit( UntypedExpr * untypedExpr ) {603 handleCallExpr( untypedExpr );604 }605 606 std::list< Expression * > * matches;607 private:608 const std::list< std::string > names;609 610 template< typename CallExpr >611 void handleCallExpr( CallExpr * expr ) {612 std::string fname = getFunctionName( expr );613 if ( std::find( names.begin(), names.end(), fname ) != names.end() ) {614 matches->push_back( expr );615 }616 }617 };618 619 310 struct CallFinder_new final { 620 311 std::vector< const ast::Expr * > matches; … … 634 325 }; 635 326 636 void collectCtorDtorCalls( Statement * stmt, std::list< Expression * > & matches ) {637 static PassVisitor<CallFinder_old> finder( std::list< std::string >{ "?{}", "^?{}" } );638 finder.pass.matches = &matches;639 maybeAccept( stmt, finder );640 }641 642 327 std::vector< const ast::Expr * > collectCtorDtorCalls( const ast::Stmt * stmt ) { 643 328 ast::Pass< CallFinder_new > finder{ std::vector< std::string >{ "?{}", "^?{}" } }; … … 646 331 } 647 332 648 Expression * getCtorDtorCall( Statement * stmt ) {649 std::list< Expression * > matches;650 collectCtorDtorCalls( stmt, matches );651 assertf( matches.size() <= 1, "%zd constructor/destructors found in %s", matches.size(), toString( stmt ).c_str() );652 return matches.size() == 1 ? matches.front() : nullptr;653 }654 655 333 namespace { 656 DeclarationWithType * getCalledFunction( Expression * expr );657 658 template<typename CallExpr>659 DeclarationWithType * handleDerefCalledFunction( CallExpr * expr ) {660 // (*f)(x) => should get "f"661 std::string name = getFunctionName( expr );662 assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() );663 assertf( ! expr->get_args().empty(), "Cannot get called function from dereference with no arguments" );664 return getCalledFunction( expr->get_args().front() );665 }666 667 DeclarationWithType * getCalledFunction( Expression * expr ) {668 assert( expr );669 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) {670 return varExpr->var;671 } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( expr ) ) {672 return memberExpr->member;673 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {674 return getCalledFunction( castExpr->arg );675 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( expr ) ) {676 return handleDerefCalledFunction( untypedExpr );677 } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * > ( expr ) ) {678 return handleDerefCalledFunction( appExpr );679 } else if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( expr ) ) {680 return getCalledFunction( addrExpr->arg );681 } else if ( CommaExpr * commaExpr = dynamic_cast< CommaExpr * >( expr ) ) {682 return getCalledFunction( commaExpr->arg2 );683 }684 return nullptr;685 }686 687 DeclarationWithType * getFunctionCore( const Expression * expr ) {688 if ( const auto * appExpr = dynamic_cast< const ApplicationExpr * >( expr ) ) {689 return getCalledFunction( appExpr->function );690 } else if ( const auto * untyped = dynamic_cast< const UntypedExpr * >( expr ) ) {691 return getCalledFunction( untyped->function );692 }693 assertf( false, "getFunction with unknown expression: %s", toString( expr ).c_str() );694 }695 }696 697 DeclarationWithType * getFunction( Expression * expr ) {698 return getFunctionCore( expr );699 }700 701 const DeclarationWithType * getFunction( const Expression * expr ) {702 return getFunctionCore( expr );703 }704 705 ApplicationExpr * isIntrinsicCallExpr( Expression * expr ) {706 ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr );707 if ( ! appExpr ) return nullptr;708 DeclarationWithType * function = getCalledFunction( appExpr->get_function() );709 assertf( function, "getCalledFunction returned nullptr: %s", toString( appExpr->get_function() ).c_str() );710 // check for Intrinsic only - don't want to remove all overridable ctor/dtors because autogenerated ctor/dtor711 // will call all member dtors, and some members may have a user defined dtor.712 return function->get_linkage() == LinkageSpec::Intrinsic ? appExpr : nullptr;713 }714 715 namespace {716 template <typename Predicate>717 bool allofCtorDtor( Statement * stmt, const Predicate & pred ) {718 std::list< Expression * > callExprs;719 collectCtorDtorCalls( stmt, callExprs );720 return std::all_of( callExprs.begin(), callExprs.end(), pred);721 }722 723 334 template <typename Predicate> 724 335 bool allofCtorDtor( const ast::Stmt * stmt, const Predicate & pred ) { … … 726 337 return std::all_of( callExprs.begin(), callExprs.end(), pred ); 727 338 } 728 }729 730 bool isIntrinsicSingleArgCallStmt( Statement * stmt ) {731 return allofCtorDtor( stmt, []( Expression * callExpr ){732 if ( ApplicationExpr * appExpr = isIntrinsicCallExpr( callExpr ) ) {733 FunctionType *funcType = GenPoly::getFunctionType( appExpr->function->result );734 assert( funcType );735 return funcType->get_parameters().size() == 1;736 }737 return false;738 });739 339 } 740 340 … … 749 349 return false; 750 350 }); 751 }752 753 bool isIntrinsicCallStmt( Statement * stmt ) {754 return allofCtorDtor( stmt, []( Expression * callExpr ) {755 return isIntrinsicCallExpr( callExpr );756 });757 }758 759 namespace {760 template<typename CallExpr>761 Expression *& callArg( CallExpr * callExpr, unsigned int pos ) {762 if ( pos >= callExpr->get_args().size() ) assertf( false, "getCallArg for argument that doesn't exist: (%u); %s.", pos, toString( callExpr ).c_str() );763 for ( Expression *& arg : callExpr->get_args() ) {764 if ( pos == 0 ) return arg;765 pos--;766 }767 assert( false );768 }769 }770 771 Expression *& getCallArg( Expression * callExpr, unsigned int pos ) {772 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( callExpr ) ) {773 return callArg( appExpr, pos );774 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( callExpr ) ) {775 return callArg( untypedExpr, pos );776 } else if ( TupleAssignExpr * tupleExpr = dynamic_cast< TupleAssignExpr * > ( callExpr ) ) {777 std::list< Statement * > & stmts = tupleExpr->get_stmtExpr()->get_statements()->get_kids();778 assertf( ! stmts.empty(), "TupleAssignExpr somehow has no statements." );779 ExprStmt * stmt = strict_dynamic_cast< ExprStmt * >( stmts.back() );780 TupleExpr * tuple = strict_dynamic_cast< TupleExpr * >( stmt->get_expr() );781 assertf( ! tuple->get_exprs().empty(), "TupleAssignExpr somehow has empty tuple expr." );782 return getCallArg( tuple->get_exprs().front(), pos );783 } else if ( ImplicitCopyCtorExpr * copyCtor = dynamic_cast< ImplicitCopyCtorExpr * >( callExpr ) ) {784 return getCallArg( copyCtor->callExpr, pos );785 } else {786 assertf( false, "Unexpected expression type passed to getCallArg: %s", toString( callExpr ).c_str() );787 }788 }789 790 namespace {791 std::string funcName( Expression * func );792 793 template<typename CallExpr>794 std::string handleDerefName( CallExpr * expr ) {795 // (*f)(x) => should get name "f"796 std::string name = getFunctionName( expr );797 assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() );798 assertf( ! expr->get_args().empty(), "Cannot get function name from dereference with no arguments" );799 return funcName( expr->get_args().front() );800 }801 802 std::string funcName( Expression * func ) {803 if ( NameExpr * nameExpr = dynamic_cast< NameExpr * >( func ) ) {804 return nameExpr->get_name();805 } else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( func ) ) {806 return varExpr->get_var()->get_name();807 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( func ) ) {808 return funcName( castExpr->get_arg() );809 } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( func ) ) {810 return memberExpr->get_member()->get_name();811 } else if ( UntypedMemberExpr * memberExpr = dynamic_cast< UntypedMemberExpr * > ( func ) ) {812 return funcName( memberExpr->get_member() );813 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( func ) ) {814 return handleDerefName( untypedExpr );815 } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( func ) ) {816 return handleDerefName( appExpr );817 } else if ( ConstructorExpr * ctorExpr = dynamic_cast< ConstructorExpr * >( func ) ) {818 return funcName( getCallArg( ctorExpr->get_callExpr(), 0 ) );819 } else {820 assertf( false, "Unexpected expression type being called as a function in call expression: %s", toString( func ).c_str() );821 }822 }823 }824 825 std::string getFunctionName( Expression * expr ) {826 // there's some unforunate overlap here with getCalledFunction. Ideally this would be able to use getCalledFunction and827 // return the name of the DeclarationWithType, but this needs to work for NameExpr and UntypedMemberExpr, where getCalledFunction828 // can't possibly do anything reasonable.829 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ) ) {830 return funcName( appExpr->get_function() );831 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * > ( expr ) ) {832 return funcName( untypedExpr->get_function() );833 } else {834 std::cerr << expr << std::endl;835 assertf( false, "Unexpected expression type passed to getFunctionName" );836 }837 }838 839 Type * getPointerBase( Type * type ) {840 if ( PointerType * ptrType = dynamic_cast< PointerType * >( type ) ) {841 return ptrType->get_base();842 } else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {843 return arrayType->get_base();844 } else if ( ReferenceType * refType = dynamic_cast< ReferenceType * >( type ) ) {845 return refType->get_base();846 } else {847 return nullptr;848 }849 }850 851 Type * isPointerType( Type * type ) {852 return getPointerBase( type ) ? type : nullptr;853 }854 855 ApplicationExpr * createBitwiseAssignment( Expression * dst, Expression * src ) {856 static FunctionDecl * assign = nullptr;857 if ( ! assign ) {858 // temporary? Generate a fake assignment operator to represent bitwise assignments.859 // This operator could easily exist as a real function, but it's tricky because nothing should resolve to this function.860 TypeDecl * td = new TypeDecl( "T", noStorageClasses, nullptr, TypeDecl::Dtype, true );861 assign = new FunctionDecl( "?=?", noStorageClasses, LinkageSpec::Intrinsic, SymTab::genAssignType( new TypeInstType( noQualifiers, td->name, td ) ), nullptr );862 }863 if ( dynamic_cast< ReferenceType * >( dst->result ) ) {864 for (int depth = dst->result->referenceDepth(); depth > 0; depth--) {865 dst = new AddressExpr( dst );866 }867 } else {868 dst = new CastExpr( dst, new ReferenceType( noQualifiers, dst->result->clone() ) );869 }870 if ( dynamic_cast< ReferenceType * >( src->result ) ) {871 for (int depth = src->result->referenceDepth(); depth > 0; depth--) {872 src = new AddressExpr( src );873 }874 }875 return new ApplicationExpr( VariableExpr::functionPointer( assign ), { dst, src } );876 351 } 877 352 … … 905 380 return app; 906 381 } 907 908 struct ConstExprChecker : public WithShortCircuiting {909 // most expressions are not const expr910 void previsit( Expression * ) { isConstExpr = false; visit_children = false; }911 912 void previsit( AddressExpr *addressExpr ) {913 visit_children = false;914 915 // address of a variable or member expression is constexpr916 Expression * arg = addressExpr->get_arg();917 if ( ! dynamic_cast< NameExpr * >( arg) && ! dynamic_cast< VariableExpr * >( arg ) && ! dynamic_cast< MemberExpr * >( arg ) && ! dynamic_cast< UntypedMemberExpr * >( arg ) ) isConstExpr = false;918 }919 920 // these expressions may be const expr, depending on their children921 void previsit( SizeofExpr * ) {}922 void previsit( AlignofExpr * ) {}923 void previsit( UntypedOffsetofExpr * ) {}924 void previsit( OffsetofExpr * ) {}925 void previsit( OffsetPackExpr * ) {}926 void previsit( CommaExpr * ) {}927 void previsit( LogicalExpr * ) {}928 void previsit( ConditionalExpr * ) {}929 void previsit( CastExpr * ) {}930 void previsit( ConstantExpr * ) {}931 932 void previsit( VariableExpr * varExpr ) {933 visit_children = false;934 935 if ( EnumInstType * inst = dynamic_cast< EnumInstType * >( varExpr->result ) ) {936 long long int value;937 if ( inst->baseEnum->valueOf( varExpr->var, value ) ) {938 // enumerators are const expr939 return;940 }941 }942 isConstExpr = false;943 }944 945 bool isConstExpr = true;946 };947 382 948 383 struct ConstExprChecker_new : public ast::WithShortCircuiting { … … 989 424 }; 990 425 991 bool isConstExpr( Expression * expr ) {992 if ( expr ) {993 PassVisitor<ConstExprChecker> checker;994 expr->accept( checker );995 return checker.pass.isConstExpr;996 }997 return true;998 }999 1000 bool isConstExpr( Initializer * init ) {1001 if ( init ) {1002 PassVisitor<ConstExprChecker> checker;1003 init->accept( checker );1004 return checker.pass.isConstExpr;1005 } // if1006 // for all intents and purposes, no initializer means const expr1007 return true;1008 }1009 1010 426 bool isConstExpr( const ast::Expr * expr ) { 1011 427 if ( expr ) { … … 1027 443 } 1028 444 1029 const FunctionDecl * isCopyFunction( const Declaration * decl, const std::string & fname ) {1030 const FunctionDecl * function = dynamic_cast< const FunctionDecl * >( decl );1031 if ( ! function ) return nullptr;1032 if ( function->name != fname ) return nullptr;1033 FunctionType * ftype = function->type;1034 if ( ftype->parameters.size() != 2 ) return nullptr;1035 1036 Type * t1 = getPointerBase( ftype->get_parameters().front()->get_type() );1037 Type * t2 = ftype->parameters.back()->get_type();1038 assert( t1 );1039 1040 if ( ResolvExpr::typesCompatibleIgnoreQualifiers( t1, t2, SymTab::Indexer() ) ) {1041 return function;1042 } else {1043 return nullptr;1044 }1045 }1046 1047 445 bool isAssignment( const ast::FunctionDecl * decl ) { 1048 446 return CodeGen::isAssignment( decl->name ) && isCopyFunction( decl ); … … 1071 469 return ResolvExpr::typesCompatibleIgnoreQualifiers( t1, t2 ); 1072 470 } 1073 1074 1075 const FunctionDecl * isAssignment( const Declaration * decl ) {1076 return isCopyFunction( decl, "?=?" );1077 }1078 const FunctionDecl * isDestructor( const Declaration * decl ) {1079 if ( CodeGen::isDestructor( decl->name ) ) {1080 return dynamic_cast< const FunctionDecl * >( decl );1081 }1082 return nullptr;1083 }1084 const FunctionDecl * isDefaultConstructor( const Declaration * decl ) {1085 if ( CodeGen::isConstructor( decl->name ) ) {1086 if ( const FunctionDecl * func = dynamic_cast< const FunctionDecl * >( decl ) ) {1087 if ( func->type->parameters.size() == 1 ) {1088 return func;1089 }1090 }1091 }1092 return nullptr;1093 }1094 const FunctionDecl * isCopyConstructor( const Declaration * decl ) {1095 return isCopyFunction( decl, "?{}" );1096 }1097 471 1098 472 #if defined( __x86_64 ) || defined( __i386 ) // assembler comment to prevent assembler warning message … … 1103 477 static const char * const data_section = ".data" ASM_COMMENT; 1104 478 static const char * const tlsd_section = ".tdata" ASM_COMMENT; 1105 void addDataSectionAttribute( ObjectDecl * objDecl ) {1106 const bool is_tls = objDecl->get_storageClasses().is_threadlocal_any();1107 const char * section = is_tls ? tlsd_section : data_section;1108 objDecl->attributes.push_back(new Attribute("section", {1109 new ConstantExpr( Constant::from_string( section ) )1110 }));1111 }1112 479 1113 480 void addDataSectionAttribute( ast::ObjectDecl * objDecl ) {
Note:
See TracChangeset
for help on using the changeset viewer.