forked from OSchip/llvm-project
Refactor tryCaptureVar using ExtractMethod. No functionality change.
In chicago, Doug had requested that I go ahead and commit the refactor as a separate change, if all the tests passed. Lets hope the buildbots stay quiet. Thanks! llvm-svn: 192087
This commit is contained in:
Faisal Vali
parent
2658d89728
commit
ad090d82f2
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@ -11209,36 +11209,255 @@ diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
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// capture.
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}
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/// \brief Capture the given variable in the captured region.
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static ExprResult captureInCapturedRegion(Sema &S, CapturedRegionScopeInfo *RSI,
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VarDecl *Var, QualType FieldType,
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QualType DeclRefType,
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SourceLocation Loc,
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bool RefersToEnclosingLocal) {
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// The current implemention assumes that all variables are captured
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// by references. Since there is no capture by copy, no expression evaluation
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// will be needed.
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//
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RecordDecl *RD = RSI->TheRecordDecl;
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FieldDecl *Field
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= FieldDecl::Create(S.Context, RD, Loc, Loc, 0, FieldType,
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S.Context.getTrivialTypeSourceInfo(FieldType, Loc),
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0, false, ICIS_NoInit);
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Field->setImplicit(true);
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Field->setAccess(AS_private);
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RD->addDecl(Field);
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Expr *Ref = new (S.Context) DeclRefExpr(Var, RefersToEnclosingLocal,
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DeclRefType, VK_LValue, Loc);
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Var->setReferenced(true);
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Var->markUsed(S.Context);
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return Ref;
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static bool isVariableAlreadyCapturedInScopeInfo(CapturingScopeInfo *CSI, VarDecl *Var,
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bool &SubCapturesAreNested,
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QualType &CaptureType,
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QualType &DeclRefType) {
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// Check whether we've already captured it.
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if (CSI->CaptureMap.count(Var)) {
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// If we found a capture, any subcaptures are nested.
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SubCapturesAreNested = true;
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// Retrieve the capture type for this variable.
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CaptureType = CSI->getCapture(Var).getCaptureType();
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// Compute the type of an expression that refers to this variable.
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DeclRefType = CaptureType.getNonReferenceType();
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const CapturingScopeInfo::Capture &Cap = CSI->getCapture(Var);
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if (Cap.isCopyCapture() &&
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!(isa<LambdaScopeInfo>(CSI) && cast<LambdaScopeInfo>(CSI)->Mutable))
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DeclRefType.addConst();
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return true;
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}
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return false;
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}
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/// \brief Capture the given variable in the given lambda expression.
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static ExprResult captureInLambda(Sema &S, LambdaScopeInfo *LSI,
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// Only block literals, captured statements, and lambda expressions can
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// capture; other scopes don't work.
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static DeclContext *getParentOfCapturingContextOrNull(DeclContext *DC, VarDecl *Var,
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SourceLocation Loc,
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const bool Diagnose, Sema &S) {
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if (isa<BlockDecl>(DC) || isa<CapturedDecl>(DC))
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return DC->getParent();
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else if (isa<CXXMethodDecl>(DC) &&
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cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
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cast<CXXRecordDecl>(DC->getParent())->isLambda())
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return DC->getParent()->getParent();
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else {
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if (Diagnose)
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diagnoseUncapturableValueReference(S, Loc, Var, DC);
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}
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return 0;
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}
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// Certain capturing entities (lambdas, blocks etc.) are not allowed to capture
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// certain types of variables (unnamed, variably modified types etc.)
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// so check for eligibility.
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static bool isVariableCapturable(CapturingScopeInfo *CSI, VarDecl *Var,
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SourceLocation Loc,
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const bool Diagnose, Sema &S) {
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bool IsBlock = isa<BlockScopeInfo>(CSI);
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bool IsLambda = isa<LambdaScopeInfo>(CSI);
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// Lambdas are not allowed to capture unnamed variables
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// (e.g. anonymous unions).
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// FIXME: The C++11 rule don't actually state this explicitly, but I'm
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// assuming that's the intent.
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if (IsLambda && !Var->getDeclName()) {
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if (Diagnose) {
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S.Diag(Loc, diag::err_lambda_capture_anonymous_var);
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S.Diag(Var->getLocation(), diag::note_declared_at);
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}
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return false;
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}
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// Prohibit variably-modified types; they're difficult to deal with.
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if (Var->getType()->isVariablyModifiedType()) {
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if (Diagnose) {
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if (IsBlock)
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S.Diag(Loc, diag::err_ref_vm_type);
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else
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S.Diag(Loc, diag::err_lambda_capture_vm_type) << Var->getDeclName();
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S.Diag(Var->getLocation(), diag::note_previous_decl)
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<< Var->getDeclName();
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}
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return false;
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}
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// Prohibit structs with flexible array members too.
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// We cannot capture what is in the tail end of the struct.
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if (const RecordType *VTTy = Var->getType()->getAs<RecordType>()) {
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if (VTTy->getDecl()->hasFlexibleArrayMember()) {
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if (Diagnose) {
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if (IsBlock)
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S.Diag(Loc, diag::err_ref_flexarray_type);
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else
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S.Diag(Loc, diag::err_lambda_capture_flexarray_type)
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<< Var->getDeclName();
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S.Diag(Var->getLocation(), diag::note_previous_decl)
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<< Var->getDeclName();
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}
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return false;
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}
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}
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const bool HasBlocksAttr = Var->hasAttr<BlocksAttr>();
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// Lambdas and captured statements are not allowed to capture __block
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// variables; they don't support the expected semantics.
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if (HasBlocksAttr && (IsLambda || isa<CapturedRegionScopeInfo>(CSI))) {
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if (Diagnose) {
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S.Diag(Loc, diag::err_capture_block_variable)
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<< Var->getDeclName() << !IsLambda;
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S.Diag(Var->getLocation(), diag::note_previous_decl)
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<< Var->getDeclName();
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}
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return false;
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}
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return true;
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}
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// Returns true if the capture by block was successful.
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static bool captureInBlock(BlockScopeInfo *BSI, VarDecl *Var,
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SourceLocation Loc,
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const bool BuildAndDiagnose,
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QualType &CaptureType,
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QualType &DeclRefType,
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const bool Nested,
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Sema &S) {
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Expr *CopyExpr = 0;
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bool ByRef = false;
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// Blocks are not allowed to capture arrays.
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if (CaptureType->isArrayType()) {
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if (BuildAndDiagnose) {
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S.Diag(Loc, diag::err_ref_array_type);
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S.Diag(Var->getLocation(), diag::note_previous_decl)
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<< Var->getDeclName();
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}
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return false;
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}
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// Forbid the block-capture of autoreleasing variables.
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if (CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
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if (BuildAndDiagnose) {
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S.Diag(Loc, diag::err_arc_autoreleasing_capture)
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<< /*block*/ 0;
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S.Diag(Var->getLocation(), diag::note_previous_decl)
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<< Var->getDeclName();
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}
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return false;
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}
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const bool HasBlocksAttr = Var->hasAttr<BlocksAttr>();
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if (HasBlocksAttr || CaptureType->isReferenceType()) {
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// Block capture by reference does not change the capture or
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// declaration reference types.
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ByRef = true;
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} else {
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// Block capture by copy introduces 'const'.
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CaptureType = CaptureType.getNonReferenceType().withConst();
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DeclRefType = CaptureType;
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if (S.getLangOpts().CPlusPlus && BuildAndDiagnose) {
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if (const RecordType *Record = DeclRefType->getAs<RecordType>()) {
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// The capture logic needs the destructor, so make sure we mark it.
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// Usually this is unnecessary because most local variables have
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// their destructors marked at declaration time, but parameters are
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// an exception because it's technically only the call site that
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// actually requires the destructor.
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if (isa<ParmVarDecl>(Var))
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S.FinalizeVarWithDestructor(Var, Record);
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// Enter a new evaluation context to insulate the copy
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// full-expression.
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EnterExpressionEvaluationContext scope(S, S.PotentiallyEvaluated);
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// According to the blocks spec, the capture of a variable from
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// the stack requires a const copy constructor. This is not true
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// of the copy/move done to move a __block variable to the heap.
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Expr *DeclRef = new (S.Context) DeclRefExpr(Var, Nested,
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DeclRefType.withConst(),
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VK_LValue, Loc);
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ExprResult Result
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= S.PerformCopyInitialization(
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InitializedEntity::InitializeBlock(Var->getLocation(),
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CaptureType, false),
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Loc, S.Owned(DeclRef));
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// Build a full-expression copy expression if initialization
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// succeeded and used a non-trivial constructor. Recover from
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// errors by pretending that the copy isn't necessary.
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if (!Result.isInvalid() &&
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!cast<CXXConstructExpr>(Result.get())->getConstructor()
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->isTrivial()) {
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Result = S.MaybeCreateExprWithCleanups(Result);
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CopyExpr = Result.take();
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}
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}
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}
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}
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// Actually capture the variable.
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if (BuildAndDiagnose)
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BSI->addCapture(Var, HasBlocksAttr, ByRef, Nested, Loc,
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SourceLocation(), CaptureType, CopyExpr);
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return true;
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}
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/// \brief Capture the given variable in the captured region.
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static bool captureInCapturedRegion(CapturedRegionScopeInfo *RSI,
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VarDecl *Var,
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SourceLocation Loc,
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const bool BuildAndDiagnose,
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QualType &CaptureType,
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QualType &DeclRefType,
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const bool RefersToEnclosingLocal,
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Sema &S) {
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// By default, capture variables by reference.
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bool ByRef = true;
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// Using an LValue reference type is consistent with Lambdas (see below).
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CaptureType = S.Context.getLValueReferenceType(DeclRefType);
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Expr *CopyExpr = 0;
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if (BuildAndDiagnose) {
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// The current implementation assumes that all variables are captured
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// by references. Since there is no capture by copy, no expression evaluation
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// will be needed.
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//
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RecordDecl *RD = RSI->TheRecordDecl;
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FieldDecl *Field
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= FieldDecl::Create(S.Context, RD, Loc, Loc, 0, CaptureType,
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S.Context.getTrivialTypeSourceInfo(CaptureType, Loc),
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0, false, ICIS_NoInit);
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Field->setImplicit(true);
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Field->setAccess(AS_private);
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RD->addDecl(Field);
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CopyExpr = new (S.Context) DeclRefExpr(Var, RefersToEnclosingLocal,
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DeclRefType, VK_LValue, Loc);
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Var->setReferenced(true);
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Var->markUsed(S.Context);
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}
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// Actually capture the variable.
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if (BuildAndDiagnose)
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RSI->addCapture(Var, /*isBlock*/false, ByRef, RefersToEnclosingLocal, Loc,
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SourceLocation(), CaptureType, CopyExpr);
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return true;
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}
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/// \brief Create a field within the lambda class for the variable
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/// being captured. Handle Array captures.
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static ExprResult addAsFieldToClosureType(Sema &S,
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LambdaScopeInfo *LSI,
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VarDecl *Var, QualType FieldType,
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QualType DeclRefType,
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SourceLocation Loc,
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@ -11355,7 +11574,105 @@ static ExprResult captureInLambda(Sema &S, LambdaScopeInfo *LSI,
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return Result;
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}
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bool Sema::tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
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/// \brief Capture the given variable in the lambda.
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static bool captureInLambda(LambdaScopeInfo *LSI,
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VarDecl *Var,
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SourceLocation Loc,
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const bool BuildAndDiagnose,
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QualType &CaptureType,
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QualType &DeclRefType,
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const bool RefersToEnclosingLocal,
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const Sema::TryCaptureKind Kind,
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SourceLocation EllipsisLoc,
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const bool IsTopScope,
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Sema &S) {
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// Determine whether we are capturing by reference or by value.
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bool ByRef = false;
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if (IsTopScope && Kind != Sema::TryCapture_Implicit) {
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ByRef = (Kind == Sema::TryCapture_ExplicitByRef);
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} else {
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ByRef = (LSI->ImpCaptureStyle == LambdaScopeInfo::ImpCap_LambdaByref);
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}
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// Compute the type of the field that will capture this variable.
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if (ByRef) {
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// C++11 [expr.prim.lambda]p15:
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// An entity is captured by reference if it is implicitly or
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// explicitly captured but not captured by copy. It is
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// unspecified whether additional unnamed non-static data
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// members are declared in the closure type for entities
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// captured by reference.
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//
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// FIXME: It is not clear whether we want to build an lvalue reference
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// to the DeclRefType or to CaptureType.getNonReferenceType(). GCC appears
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// to do the former, while EDG does the latter. Core issue 1249 will
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// clarify, but for now we follow GCC because it's a more permissive and
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// easily defensible position.
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CaptureType = S.Context.getLValueReferenceType(DeclRefType);
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} else {
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// C++11 [expr.prim.lambda]p14:
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// For each entity captured by copy, an unnamed non-static
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// data member is declared in the closure type. The
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// declaration order of these members is unspecified. The type
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// of such a data member is the type of the corresponding
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// captured entity if the entity is not a reference to an
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// object, or the referenced type otherwise. [Note: If the
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// captured entity is a reference to a function, the
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// corresponding data member is also a reference to a
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// function. - end note ]
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if (const ReferenceType *RefType = CaptureType->getAs<ReferenceType>()){
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if (!RefType->getPointeeType()->isFunctionType())
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CaptureType = RefType->getPointeeType();
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}
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// Forbid the lambda copy-capture of autoreleasing variables.
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if (CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
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if (BuildAndDiagnose) {
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S.Diag(Loc, diag::err_arc_autoreleasing_capture) << /*lambda*/ 1;
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S.Diag(Var->getLocation(), diag::note_previous_decl)
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<< Var->getDeclName();
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}
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return false;
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}
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}
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// Capture this variable in the lambda.
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Expr *CopyExpr = 0;
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if (BuildAndDiagnose) {
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ExprResult Result = addAsFieldToClosureType(S, LSI, Var,
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CaptureType, DeclRefType, Loc,
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RefersToEnclosingLocal);
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if (!Result.isInvalid())
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CopyExpr = Result.take();
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}
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// Compute the type of a reference to this captured variable.
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if (ByRef)
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DeclRefType = CaptureType.getNonReferenceType();
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else {
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// C++ [expr.prim.lambda]p5:
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// The closure type for a lambda-expression has a public inline
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// function call operator [...]. This function call operator is
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// declared const (9.3.1) if and only if the lambda-expression’s
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// parameter-declaration-clause is not followed by mutable.
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DeclRefType = CaptureType.getNonReferenceType();
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if (!LSI->Mutable && !CaptureType->isReferenceType())
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DeclRefType.addConst();
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}
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// Add the capture.
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if (BuildAndDiagnose)
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LSI->addCapture(Var, /*IsBlock=*/false, ByRef, RefersToEnclosingLocal,
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Loc, EllipsisLoc, CaptureType, CopyExpr);
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return true;
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}
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bool Sema::tryCaptureVariable(VarDecl *Var, SourceLocation ExprLoc,
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TryCaptureKind Kind, SourceLocation EllipsisLoc,
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bool BuildAndDiagnose,
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QualType &CaptureType,
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@ -11363,6 +11680,10 @@ bool Sema::tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
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bool Nested = false;
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DeclContext *DC = CurContext;
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const unsigned MaxFunctionScopesIndex = FunctionScopes.size() - 1;
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// If the variable is declared in the current context (and is not an
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// init-capture), there is no need to capture it.
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if (!Var->isInitCapture() && Var->getDeclContext() == DC) return true;
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if (!Var->hasLocalStorage()) return true;
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@ -11371,108 +11692,46 @@ bool Sema::tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
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// Walk up the stack to determine whether we can capture the variable,
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// performing the "simple" checks that don't depend on type. We stop when
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// we've either hit the declared scope of the variable or find an existing
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// capture of that variable.
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// capture of that variable. We start from the innermost capturing-entity
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// (the DC) and ensure that all intervening capturing-entities
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// (blocks/lambdas etc.) between the innermost capturer and the variable`s
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// declcontext can either capture the variable or have already captured
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// the variable.
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CaptureType = Var->getType();
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DeclRefType = CaptureType.getNonReferenceType();
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bool Explicit = (Kind != TryCapture_Implicit);
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unsigned FunctionScopesIndex = FunctionScopes.size() - 1;
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unsigned FunctionScopesIndex = MaxFunctionScopesIndex;
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do {
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// Only block literals, captured statements, and lambda expressions can
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// capture; other scopes don't work.
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DeclContext *ParentDC;
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if (isa<BlockDecl>(DC) || isa<CapturedDecl>(DC))
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ParentDC = DC->getParent();
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else if (isa<CXXMethodDecl>(DC) &&
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cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
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cast<CXXRecordDecl>(DC->getParent())->isLambda())
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ParentDC = DC->getParent()->getParent();
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else {
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if (BuildAndDiagnose)
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diagnoseUncapturableValueReference(*this, Loc, Var, DC);
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return true;
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}
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DeclContext *ParentDC = getParentOfCapturingContextOrNull(DC, Var,
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ExprLoc,
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BuildAndDiagnose,
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*this);
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if (!ParentDC) return true;
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FunctionScopeInfo *FSI = FunctionScopes[FunctionScopesIndex];
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CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FSI);
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CapturingScopeInfo *CSI =
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cast<CapturingScopeInfo>(FunctionScopes[FunctionScopesIndex]);
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// Check whether we've already captured it.
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if (CSI->isCaptured(Var)) {
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const CapturingScopeInfo::Capture &Cap = CSI->getCapture(Var);
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// If we found a capture, any subcaptures are nested.
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Nested = true;
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// Retrieve the capture type for this variable.
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CaptureType = Cap.getCaptureType();
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|
||||
// Compute the type of an expression that refers to this variable.
|
||||
DeclRefType = CaptureType.getNonReferenceType();
|
||||
|
||||
if (Cap.isCopyCapture() &&
|
||||
!(isa<LambdaScopeInfo>(CSI) && cast<LambdaScopeInfo>(CSI)->Mutable))
|
||||
DeclRefType.addConst();
|
||||
if (isVariableAlreadyCapturedInScopeInfo(CSI, Var, Nested, CaptureType,
|
||||
DeclRefType))
|
||||
break;
|
||||
}
|
||||
|
||||
bool IsBlock = isa<BlockScopeInfo>(CSI);
|
||||
bool IsLambda = isa<LambdaScopeInfo>(CSI);
|
||||
|
||||
// Lambdas are not allowed to capture unnamed variables
|
||||
// (e.g. anonymous unions).
|
||||
// FIXME: The C++11 rule don't actually state this explicitly, but I'm
|
||||
// assuming that's the intent.
|
||||
if (IsLambda && !Var->getDeclName()) {
|
||||
if (BuildAndDiagnose) {
|
||||
Diag(Loc, diag::err_lambda_capture_anonymous_var);
|
||||
Diag(Var->getLocation(), diag::note_declared_at);
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
// Prohibit variably-modified types; they're difficult to deal with.
|
||||
if (Var->getType()->isVariablyModifiedType()) {
|
||||
if (BuildAndDiagnose) {
|
||||
if (IsBlock)
|
||||
Diag(Loc, diag::err_ref_vm_type);
|
||||
else
|
||||
Diag(Loc, diag::err_lambda_capture_vm_type) << Var->getDeclName();
|
||||
Diag(Var->getLocation(), diag::note_previous_decl)
|
||||
<< Var->getDeclName();
|
||||
}
|
||||
return true;
|
||||
}
|
||||
// Prohibit structs with flexible array members too.
|
||||
// We cannot capture what is in the tail end of the struct.
|
||||
if (const RecordType *VTTy = Var->getType()->getAs<RecordType>()) {
|
||||
if (VTTy->getDecl()->hasFlexibleArrayMember()) {
|
||||
if (BuildAndDiagnose) {
|
||||
if (IsBlock)
|
||||
Diag(Loc, diag::err_ref_flexarray_type);
|
||||
else
|
||||
Diag(Loc, diag::err_lambda_capture_flexarray_type)
|
||||
<< Var->getDeclName();
|
||||
Diag(Var->getLocation(), diag::note_previous_decl)
|
||||
<< Var->getDeclName();
|
||||
}
|
||||
return true;
|
||||
}
|
||||
}
|
||||
// Lambdas and captured statements are not allowed to capture __block
|
||||
// variables; they don't support the expected semantics.
|
||||
if (HasBlocksAttr && (IsLambda || isa<CapturedRegionScopeInfo>(CSI))) {
|
||||
if (BuildAndDiagnose) {
|
||||
Diag(Loc, diag::err_capture_block_variable)
|
||||
<< Var->getDeclName() << !IsLambda;
|
||||
Diag(Var->getLocation(), diag::note_previous_decl)
|
||||
<< Var->getDeclName();
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
// Certain capturing entities (lambdas, blocks etc.) are not allowed to capture
|
||||
// certain types of variables (unnamed, variably modified types etc.)
|
||||
// so check for eligibility.
|
||||
if (!isVariableCapturable(CSI, Var, ExprLoc, BuildAndDiagnose, *this))
|
||||
return true;
|
||||
|
||||
if (CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_None && !Explicit) {
|
||||
// No capture-default
|
||||
// No capture-default, and this is not an explicit capture
|
||||
// so cannot capture this variable.
|
||||
if (BuildAndDiagnose) {
|
||||
Diag(Loc, diag::err_lambda_impcap) << Var->getDeclName();
|
||||
Diag(ExprLoc, diag::err_lambda_impcap) << Var->getDeclName();
|
||||
Diag(Var->getLocation(), diag::note_previous_decl)
|
||||
<< Var->getDeclName();
|
||||
Diag(cast<LambdaScopeInfo>(CSI)->Lambda->getLocStart(),
|
||||
|
|
@ -11486,203 +11745,37 @@ bool Sema::tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
|
|||
Explicit = false;
|
||||
} while (!Var->getDeclContext()->Equals(DC));
|
||||
|
||||
// Walk back down the scope stack, computing the type of the capture at
|
||||
// each step, checking type-specific requirements, and adding captures if
|
||||
// requested.
|
||||
for (unsigned I = ++FunctionScopesIndex, N = FunctionScopes.size(); I != N;
|
||||
// Walk back down the scope stack, (e.g. from outer lambda to inner lambda)
|
||||
// computing the type of the capture at each step, checking type-specific
|
||||
// requirements, and adding captures if requested.
|
||||
// If the variable had already been captured previously, we start capturing
|
||||
// at the lambda nested within that one.
|
||||
for (unsigned I = ++FunctionScopesIndex, N = MaxFunctionScopesIndex + 1; I != N;
|
||||
++I) {
|
||||
CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FunctionScopes[I]);
|
||||
|
||||
// Compute the type of the capture and of a reference to the capture within
|
||||
// this scope.
|
||||
if (isa<BlockScopeInfo>(CSI)) {
|
||||
Expr *CopyExpr = 0;
|
||||
bool ByRef = false;
|
||||
|
||||
// Blocks are not allowed to capture arrays.
|
||||
if (CaptureType->isArrayType()) {
|
||||
if (BuildAndDiagnose) {
|
||||
Diag(Loc, diag::err_ref_array_type);
|
||||
Diag(Var->getLocation(), diag::note_previous_decl)
|
||||
<< Var->getDeclName();
|
||||
}
|
||||
if (BlockScopeInfo *BSI = dyn_cast<BlockScopeInfo>(CSI)) {
|
||||
if (!captureInBlock(BSI, Var, ExprLoc,
|
||||
BuildAndDiagnose, CaptureType,
|
||||
DeclRefType, Nested, *this))
|
||||
return true;
|
||||
}
|
||||
|
||||
// Forbid the block-capture of autoreleasing variables.
|
||||
if (CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
|
||||
if (BuildAndDiagnose) {
|
||||
Diag(Loc, diag::err_arc_autoreleasing_capture)
|
||||
<< /*block*/ 0;
|
||||
Diag(Var->getLocation(), diag::note_previous_decl)
|
||||
<< Var->getDeclName();
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
if (HasBlocksAttr || CaptureType->isReferenceType()) {
|
||||
// Block capture by reference does not change the capture or
|
||||
// declaration reference types.
|
||||
ByRef = true;
|
||||
} else {
|
||||
// Block capture by copy introduces 'const'.
|
||||
CaptureType = CaptureType.getNonReferenceType().withConst();
|
||||
DeclRefType = CaptureType;
|
||||
|
||||
if (getLangOpts().CPlusPlus && BuildAndDiagnose) {
|
||||
if (const RecordType *Record = DeclRefType->getAs<RecordType>()) {
|
||||
// The capture logic needs the destructor, so make sure we mark it.
|
||||
// Usually this is unnecessary because most local variables have
|
||||
// their destructors marked at declaration time, but parameters are
|
||||
// an exception because it's technically only the call site that
|
||||
// actually requires the destructor.
|
||||
if (isa<ParmVarDecl>(Var))
|
||||
FinalizeVarWithDestructor(Var, Record);
|
||||
|
||||
// Enter a new evaluation context to insulate the copy
|
||||
// full-expression.
|
||||
EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated);
|
||||
|
||||
// According to the blocks spec, the capture of a variable from
|
||||
// the stack requires a const copy constructor. This is not true
|
||||
// of the copy/move done to move a __block variable to the heap.
|
||||
Expr *DeclRef = new (Context) DeclRefExpr(Var, Nested,
|
||||
DeclRefType.withConst(),
|
||||
VK_LValue, Loc);
|
||||
|
||||
ExprResult Result
|
||||
= PerformCopyInitialization(
|
||||
InitializedEntity::InitializeBlock(Var->getLocation(),
|
||||
CaptureType, false),
|
||||
Loc, Owned(DeclRef));
|
||||
|
||||
// Build a full-expression copy expression if initialization
|
||||
// succeeded and used a non-trivial constructor. Recover from
|
||||
// errors by pretending that the copy isn't necessary.
|
||||
if (!Result.isInvalid() &&
|
||||
!cast<CXXConstructExpr>(Result.get())->getConstructor()
|
||||
->isTrivial()) {
|
||||
Result = MaybeCreateExprWithCleanups(Result);
|
||||
CopyExpr = Result.take();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Actually capture the variable.
|
||||
if (BuildAndDiagnose)
|
||||
CSI->addCapture(Var, HasBlocksAttr, ByRef, Nested, Loc,
|
||||
SourceLocation(), CaptureType, CopyExpr);
|
||||
Nested = true;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (CapturedRegionScopeInfo *RSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) {
|
||||
// By default, capture variables by reference.
|
||||
bool ByRef = true;
|
||||
// Using an LValue reference type is consistent with Lambdas (see below).
|
||||
CaptureType = Context.getLValueReferenceType(DeclRefType);
|
||||
|
||||
Expr *CopyExpr = 0;
|
||||
if (BuildAndDiagnose) {
|
||||
ExprResult Result = captureInCapturedRegion(*this, RSI, Var,
|
||||
CaptureType, DeclRefType,
|
||||
Loc, Nested);
|
||||
if (!Result.isInvalid())
|
||||
CopyExpr = Result.take();
|
||||
}
|
||||
|
||||
// Actually capture the variable.
|
||||
if (BuildAndDiagnose)
|
||||
CSI->addCapture(Var, /*isBlock*/false, ByRef, Nested, Loc,
|
||||
SourceLocation(), CaptureType, CopyExpr);
|
||||
Nested = true;
|
||||
continue;
|
||||
}
|
||||
|
||||
LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CSI);
|
||||
|
||||
// Determine whether we are capturing by reference or by value.
|
||||
bool ByRef = false;
|
||||
if (I == N - 1 && Kind != TryCapture_Implicit) {
|
||||
ByRef = (Kind == TryCapture_ExplicitByRef);
|
||||
} else {
|
||||
ByRef = (LSI->ImpCaptureStyle == LambdaScopeInfo::ImpCap_LambdaByref);
|
||||
}
|
||||
|
||||
// Compute the type of the field that will capture this variable.
|
||||
if (ByRef) {
|
||||
// C++11 [expr.prim.lambda]p15:
|
||||
// An entity is captured by reference if it is implicitly or
|
||||
// explicitly captured but not captured by copy. It is
|
||||
// unspecified whether additional unnamed non-static data
|
||||
// members are declared in the closure type for entities
|
||||
// captured by reference.
|
||||
//
|
||||
// FIXME: It is not clear whether we want to build an lvalue reference
|
||||
// to the DeclRefType or to CaptureType.getNonReferenceType(). GCC appears
|
||||
// to do the former, while EDG does the latter. Core issue 1249 will
|
||||
// clarify, but for now we follow GCC because it's a more permissive and
|
||||
// easily defensible position.
|
||||
CaptureType = Context.getLValueReferenceType(DeclRefType);
|
||||
} else {
|
||||
// C++11 [expr.prim.lambda]p14:
|
||||
// For each entity captured by copy, an unnamed non-static
|
||||
// data member is declared in the closure type. The
|
||||
// declaration order of these members is unspecified. The type
|
||||
// of such a data member is the type of the corresponding
|
||||
// captured entity if the entity is not a reference to an
|
||||
// object, or the referenced type otherwise. [Note: If the
|
||||
// captured entity is a reference to a function, the
|
||||
// corresponding data member is also a reference to a
|
||||
// function. - end note ]
|
||||
if (const ReferenceType *RefType = CaptureType->getAs<ReferenceType>()){
|
||||
if (!RefType->getPointeeType()->isFunctionType())
|
||||
CaptureType = RefType->getPointeeType();
|
||||
}
|
||||
|
||||
// Forbid the lambda copy-capture of autoreleasing variables.
|
||||
if (CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
|
||||
if (BuildAndDiagnose) {
|
||||
Diag(Loc, diag::err_arc_autoreleasing_capture) << /*lambda*/ 1;
|
||||
Diag(Var->getLocation(), diag::note_previous_decl)
|
||||
<< Var->getDeclName();
|
||||
}
|
||||
} else if (CapturedRegionScopeInfo *RSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) {
|
||||
if (!captureInCapturedRegion(RSI, Var, ExprLoc,
|
||||
BuildAndDiagnose, CaptureType,
|
||||
DeclRefType, Nested, *this))
|
||||
return true;
|
||||
}
|
||||
Nested = true;
|
||||
} else {
|
||||
LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CSI);
|
||||
if (!captureInLambda(LSI, Var, ExprLoc,
|
||||
BuildAndDiagnose, CaptureType,
|
||||
DeclRefType, Nested, Kind, EllipsisLoc,
|
||||
/*IsTopScope*/I == N - 1, *this))
|
||||
return true;
|
||||
Nested = true;
|
||||
}
|
||||
|
||||
// Capture this variable in the lambda.
|
||||
Expr *CopyExpr = 0;
|
||||
if (BuildAndDiagnose) {
|
||||
ExprResult Result = captureInLambda(*this, LSI, Var, CaptureType,
|
||||
DeclRefType, Loc,
|
||||
Nested);
|
||||
if (!Result.isInvalid())
|
||||
CopyExpr = Result.take();
|
||||
}
|
||||
|
||||
// Compute the type of a reference to this captured variable.
|
||||
if (ByRef)
|
||||
DeclRefType = CaptureType.getNonReferenceType();
|
||||
else {
|
||||
// C++ [expr.prim.lambda]p5:
|
||||
// The closure type for a lambda-expression has a public inline
|
||||
// function call operator [...]. This function call operator is
|
||||
// declared const (9.3.1) if and only if the lambda-expression’s
|
||||
// parameter-declaration-clause is not followed by mutable.
|
||||
DeclRefType = CaptureType.getNonReferenceType();
|
||||
if (!LSI->Mutable && !CaptureType->isReferenceType())
|
||||
DeclRefType.addConst();
|
||||
}
|
||||
|
||||
// Add the capture.
|
||||
if (BuildAndDiagnose)
|
||||
CSI->addCapture(Var, /*IsBlock=*/false, ByRef, Nested, Loc,
|
||||
EllipsisLoc, CaptureType, CopyExpr);
|
||||
Nested = true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue