ahatanak updated this revision to Diff 180993.
ahatanak retitled this revision from "[Sema][ObjC] Do not warn about repeated
uses of weak variables when the variables are accessed in an unevaluated
context." to "[Sema] If CheckPlaceholderExpr rewrites a placeholder expression
when the type of an auto variable is being deduced, use the rewritten
expression when performing initialization of the variable.".
ahatanak edited the summary of this revision.
ahatanak added a comment.
Pass `Init` by reference and use the rewritten expression returned in it to
perform variable initialization. Add a test case that tests new expression with
auto types.
Repository:
rC Clang
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D55662/new/
https://reviews.llvm.org/D55662
Files:
include/clang/Sema/Sema.h
lib/Sema/SemaDecl.cpp
lib/Sema/SemaExpr.cpp
lib/Sema/SemaExprCXX.cpp
lib/Sema/SemaExprObjC.cpp
lib/Sema/SemaLambda.cpp
lib/Sema/SemaTemplateDeduction.cpp
lib/Sema/SemaType.cpp
test/SemaObjC/arc-repeated-weak.mm
Index: test/SemaObjC/arc-repeated-weak.mm
===================================================================
--- test/SemaObjC/arc-repeated-weak.mm
+++ test/SemaObjC/arc-repeated-weak.mm
@@ -1,5 +1,5 @@
-// RUN: %clang_cc1 -fsyntax-only -fobjc-runtime-has-weak -fobjc-arc -fblocks -Wno-objc-root-class -std=c++11 -Warc-repeated-use-of-weak -verify %s
-// RUN: %clang_cc1 -fsyntax-only -fobjc-runtime-has-weak -fobjc-weak -fblocks -Wno-objc-root-class -std=c++11 -Warc-repeated-use-of-weak -verify %s
+// RUN: %clang_cc1 -fsyntax-only -fobjc-runtime-has-weak -fobjc-arc -fblocks -Wno-objc-root-class -std=c++11 -Warc-repeated-use-of-weak -std=c++14 -verify %s
+// RUN: %clang_cc1 -fsyntax-only -fobjc-runtime-has-weak -fobjc-weak -fblocks -Wno-objc-root-class -std=c++11 -Warc-repeated-use-of-weak -std=c++14 -verify %s
@interface Test {
@public
@@ -462,6 +462,21 @@
NSString * t2 = NSBundle.foo2.prop;
use(NSBundle.foo2.weakProp); // expected-warning{{weak property 'weakProp' may be accessed multiple times}}
use(NSBundle2.foo2.weakProp); // expected-note{{also accessed here}}
+ decltype([NSBundle2.foo2 weakProp]) t3;
+ decltype(NSBundle2.foo2.weakProp) t4;
+ __typeof__(NSBundle2.foo2.weakProp) t5;
+}
+
+void testAuto() {
+ auto __weak wp = NSBundle2.foo2.weakProp;
+}
+
+void testLambdaCaptureInit() {
+ [capture(NSBundle2.foo2.weakProp)] {} ();
+}
+
+void testAutoNew() {
+ auto p = new auto(NSBundle2.foo2.weakProp);
}
// This used to crash in the constructor of WeakObjectProfileTy when a
Index: lib/Sema/SemaType.cpp
===================================================================
--- lib/Sema/SemaType.cpp
+++ lib/Sema/SemaType.cpp
@@ -8056,9 +8056,7 @@
}
QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) {
- ExprResult ER = CheckPlaceholderExpr(E);
- if (ER.isInvalid()) return QualType();
- E = ER.get();
+ assert(!E->hasPlaceholderType() && "unexpected placeholder");
if (!getLangOpts().CPlusPlus && E->refersToBitField())
Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield) << 2;
@@ -8143,9 +8141,7 @@
QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc,
bool AsUnevaluated) {
- ExprResult ER = CheckPlaceholderExpr(E);
- if (ER.isInvalid()) return QualType();
- E = ER.get();
+ assert(!E->hasPlaceholderType() && "unexpected placeholder");
if (AsUnevaluated && CodeSynthesisContexts.empty() &&
E->HasSideEffects(Context, false)) {
Index: lib/Sema/SemaTemplateDeduction.cpp
===================================================================
--- lib/Sema/SemaTemplateDeduction.cpp
+++ lib/Sema/SemaTemplateDeduction.cpp
@@ -4429,6 +4429,10 @@
return DAR_FailedAlreadyDiagnosed;
}
+ ExprResult ER = CheckPlaceholderExpr(Init);
+ if (ER.isInvalid())
+ return DAR_FailedAlreadyDiagnosed;
+ Init = ER.get();
QualType Deduced = BuildDecltypeType(Init, Init->getBeginLoc(), false);
if (Deduced.isNull())
return DAR_FailedAlreadyDiagnosed;
Index: lib/Sema/SemaLambda.cpp
===================================================================
--- lib/Sema/SemaLambda.cpp
+++ lib/Sema/SemaLambda.cpp
@@ -759,14 +759,15 @@
TypeSourceInfo *TSI = TLB.getTypeSourceInfo(Context, DeductType);
// Deduce the type of the init capture.
+ Expr *DeduceInit = Init;
QualType DeducedType = deduceVarTypeFromInitializer(
/*VarDecl*/nullptr, DeclarationName(Id), DeductType, TSI,
- SourceRange(Loc, Loc), IsDirectInit, Init);
+ SourceRange(Loc, Loc), IsDirectInit, DeduceInit);
if (DeducedType.isNull())
return QualType();
// Are we a non-list direct initialization?
- ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init);
+ bool CXXDirectInit = isa<ParenListExpr>(Init);
// Perform initialization analysis and ensure any implicit conversions
// (such as lvalue-to-rvalue) are enforced.
@@ -779,10 +780,7 @@
: InitializationKind::CreateDirectList(Loc))
: InitializationKind::CreateCopy(Loc, Init->getBeginLoc());
- MultiExprArg Args = Init;
- if (CXXDirectInit)
- Args =
- MultiExprArg(CXXDirectInit->getExprs(), CXXDirectInit->getNumExprs());
+ MultiExprArg Args = DeduceInit;
QualType DclT;
InitializationSequence InitSeq(*this, Entity, Kind, Args);
ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Args, &DclT);
Index: lib/Sema/SemaExprObjC.cpp
===================================================================
--- lib/Sema/SemaExprObjC.cpp
+++ lib/Sema/SemaExprObjC.cpp
@@ -3161,7 +3161,7 @@
Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
if (!IsWeak && Sel.isUnarySelector())
IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
- if (IsWeak &&
+ if (IsWeak && !isUnevaluatedContext() &&
!Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
getCurFunction()->recordUseOfWeak(Result, Prop);
}
Index: lib/Sema/SemaExprCXX.cpp
===================================================================
--- lib/Sema/SemaExprCXX.cpp
+++ lib/Sema/SemaExprCXX.cpp
@@ -1865,12 +1865,11 @@
if (Braced && !getLangOpts().CPlusPlus17)
Diag(Initializer->getBeginLoc(), diag::ext_auto_new_list_init)
<< AllocType << TypeRange;
- Expr *Deduce = Inits[0];
QualType DeducedType;
- if (DeduceAutoType(AllocTypeInfo, Deduce, DeducedType) == DAR_Failed)
+ if (DeduceAutoType(AllocTypeInfo, Inits[0], DeducedType) == DAR_Failed)
return ExprError(Diag(StartLoc, diag::err_auto_new_deduction_failure)
- << AllocType << Deduce->getType()
- << TypeRange << Deduce->getSourceRange());
+ << AllocType << Inits[0]->getType()
+ << TypeRange << Inits[0]->getSourceRange());
if (DeducedType.isNull())
return ExprError();
AllocType = DeducedType;
@@ -6543,6 +6542,11 @@
ExpressionEvaluationContextRecord::EK_Decltype &&
"not in a decltype expression");
+ ExprResult Result = CheckPlaceholderExpr(E);
+ if (Result.isInvalid())
+ return ExprError();
+ E = Result.get();
+
// C++11 [expr.call]p11:
// If a function call is a prvalue of object type,
// -- if the function call is either
Index: lib/Sema/SemaExpr.cpp
===================================================================
--- lib/Sema/SemaExpr.cpp
+++ lib/Sema/SemaExpr.cpp
@@ -14550,6 +14550,10 @@
}
ExprResult Sema::HandleExprEvaluationContextForTypeof(Expr *E) {
+ ExprResult Result = CheckPlaceholderExpr(E);
+ if (Result.isInvalid())
+ return ExprError();
+ E = Result.get();
if (!E->getType()->isVariablyModifiedType())
return E;
return TransformToPotentiallyEvaluated(E);
Index: lib/Sema/SemaDecl.cpp
===================================================================
--- lib/Sema/SemaDecl.cpp
+++ lib/Sema/SemaDecl.cpp
@@ -10813,7 +10813,7 @@
DeclarationName Name, QualType Type,
TypeSourceInfo *TSI,
SourceRange Range, bool DirectInit,
- Expr *Init) {
+ Expr *&Init) {
bool IsInitCapture = !VDecl;
assert((!VDecl || !VDecl->isInitCapture()) &&
"init captures are expected to be deduced prior to initialization");
@@ -10929,7 +10929,8 @@
<< (DeduceInit->getType().isNull() ? TSI->getType()
: DeduceInit->getType())
<< DeduceInit->getSourceRange();
- }
+ } else
+ Init = DeduceInit;
// Warn if we deduced 'id'. 'auto' usually implies type-safety, but using
// 'id' instead of a specific object type prevents most of our usual
@@ -10946,7 +10947,7 @@
}
bool Sema::DeduceVariableDeclarationType(VarDecl *VDecl, bool DirectInit,
- Expr *Init) {
+ Expr *&Init) {
QualType DeducedType = deduceVarTypeFromInitializer(
VDecl, VDecl->getDeclName(), VDecl->getType(), VDecl->getTypeSourceInfo(),
VDecl->getSourceRange(), DirectInit, Init);
@@ -11452,8 +11453,9 @@
return;
}
+ Expr *TmpInit = nullptr;
if (Type->isUndeducedType() &&
- DeduceVariableDeclarationType(Var, false, nullptr))
+ DeduceVariableDeclarationType(Var, false, TmpInit))
return;
// C++11 [class.static.data]p3: A static data member can be declared with
Index: include/clang/Sema/Sema.h
===================================================================
--- include/clang/Sema/Sema.h
+++ include/clang/Sema/Sema.h
@@ -1959,7 +1959,7 @@
bool CheckVariableDeclaration(VarDecl *NewVD, LookupResult &Previous);
void CheckVariableDeclarationType(VarDecl *NewVD);
bool DeduceVariableDeclarationType(VarDecl *VDecl, bool DirectInit,
- Expr *Init);
+ Expr *&Init);
void CheckCompleteVariableDeclaration(VarDecl *VD);
void CheckCompleteDecompositionDeclaration(DecompositionDecl *DD);
void MaybeSuggestAddingStaticToDecl(const FunctionDecl *D);
@@ -7094,7 +7094,7 @@
QualType deduceVarTypeFromInitializer(VarDecl *VDecl, DeclarationName Name,
QualType Type, TypeSourceInfo *TSI,
SourceRange Range, bool DirectInit,
- Expr *Init);
+ Expr *&Init);
TypeLoc getReturnTypeLoc(FunctionDecl *FD) const;
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