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-rw-r--r--include/clang/AST/Expr.h20
-rw-r--r--include/clang/AST/ExprObjC.h3
-rw-r--r--include/clang/Basic/DiagnosticSemaKinds.td6
-rw-r--r--lib/AST/ASTContext.cpp2
-rw-r--r--lib/AST/Expr.cpp11
-rw-r--r--lib/Sema/SemaCast.cpp12
-rw-r--r--lib/Sema/SemaChecking.cpp4
-rw-r--r--lib/Sema/SemaExpr.cpp2
-rw-r--r--lib/Sema/SemaInit.cpp15
-rw-r--r--lib/Sema/SemaOverload.cpp2
-rw-r--r--test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5.cpp23
-rw-r--r--test/CXX/expr/expr.post/expr.const.cast/p1-0x.cpp17
-rw-r--r--test/CXX/expr/expr.unary/expr.sizeof/p1.cpp20
-rw-r--r--test/Sema/bitfield.c15
-rw-r--r--test/SemaObjCXX/references.mm19
15 files changed, 147 insertions, 24 deletions
diff --git a/include/clang/AST/Expr.h b/include/clang/AST/Expr.h
index 2e66df33ee..4ff1257b7d 100644
--- a/include/clang/AST/Expr.h
+++ b/include/clang/AST/Expr.h
@@ -427,12 +427,24 @@ private:
public:
+ /// \brief Returns true if this expression is a gl-value that
+ /// potentially refers to a bit-field.
+ ///
+ /// In C++, whether a gl-value refers to a bitfield is essentially
+ /// an aspect of the value-kind type system.
+ bool refersToBitField() const { return getObjectKind() == OK_BitField; }
+
/// \brief If this expression refers to a bit-field, retrieve the
/// declaration of that bit-field.
- FieldDecl *getBitField();
-
- const FieldDecl *getBitField() const {
- return const_cast<Expr*>(this)->getBitField();
+ ///
+ /// Note that this returns a non-null pointer in subtly different
+ /// places than refersToBitField returns true. In particular, this can
+ /// return a non-null pointer even for r-values loaded from
+ /// bit-fields, but it will return null for a conditional bit-field.
+ FieldDecl *getSourceBitField();
+
+ const FieldDecl *getSourceBitField() const {
+ return const_cast<Expr*>(this)->getSourceBitField();
}
/// \brief If this expression is an l-value for an Objective C
diff --git a/include/clang/AST/ExprObjC.h b/include/clang/AST/ExprObjC.h
index dfd45279dd..a94c69a115 100644
--- a/include/clang/AST/ExprObjC.h
+++ b/include/clang/AST/ExprObjC.h
@@ -476,7 +476,8 @@ public:
SourceLocation l, SourceLocation oploc,
Expr *base,
bool arrow = false, bool freeIvar = false) :
- Expr(ObjCIvarRefExprClass, t, VK_LValue, OK_Ordinary,
+ Expr(ObjCIvarRefExprClass, t, VK_LValue,
+ d->isBitField() ? OK_BitField : OK_Ordinary,
/*TypeDependent=*/false, base->isValueDependent(),
base->isInstantiationDependent(),
base->containsUnexpandedParameterPack()),
diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index bc0640eaa7..f5345eb8c3 100644
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -1307,7 +1307,8 @@ def err_member_function_call_bad_cvr : Error<"member function %0 not viable: "
"volatile or restrict|const, volatile, or restrict}2">;
def err_reference_bind_to_bitfield : Error<
- "%select{non-const|volatile}0 reference cannot bind to bit-field %1">;
+ "%select{non-const|volatile}0 reference cannot bind to "
+ "bit-field%select{| %1}2">;
def err_reference_bind_to_vector_element : Error<
"%select{non-const|volatile}0 reference cannot bind to vector element">;
def err_reference_var_requires_init : Error<
@@ -4629,6 +4630,9 @@ def err_bad_cxx_cast_generic : Error<
def err_bad_cxx_cast_rvalue : Error<
"%select{const_cast|static_cast|reinterpret_cast|dynamic_cast|C-style cast|"
"functional-style cast}0 from rvalue to reference type %2">;
+def err_bad_cxx_cast_bitfield : Error<
+ "%select{const_cast|static_cast|reinterpret_cast|dynamic_cast|C-style cast|"
+ "functional-style cast}0 from bit-field lvalue to reference type %2">;
def err_bad_cxx_cast_qualifiers_away : Error<
"%select{const_cast|static_cast|reinterpret_cast|dynamic_cast|C-style cast|"
"functional-style cast}0 from %1 to %2 casts away qualifiers">;
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index 2a405271b6..176aec53a2 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -4277,7 +4277,7 @@ QualType ASTContext::isPromotableBitField(Expr *E) const {
if (E->isTypeDependent() || E->isValueDependent())
return QualType();
- FieldDecl *Field = E->getBitField();
+ FieldDecl *Field = E->getSourceBitField(); // FIXME: conditional bit-fields?
if (!Field)
return QualType();
diff --git a/lib/AST/Expr.cpp b/lib/AST/Expr.cpp
index cf7ddbce93..9538ddf941 100644
--- a/lib/AST/Expr.cpp
+++ b/lib/AST/Expr.cpp
@@ -3149,7 +3149,7 @@ bool Expr::isObjCSelfExpr() const {
return M->getSelfDecl() == Param;
}
-FieldDecl *Expr::getBitField() {
+FieldDecl *Expr::getSourceBitField() {
Expr *E = this->IgnoreParens();
while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
@@ -3165,6 +3165,11 @@ FieldDecl *Expr::getBitField() {
if (Field->isBitField())
return Field;
+ if (ObjCIvarRefExpr *IvarRef = dyn_cast<ObjCIvarRefExpr>(E))
+ if (FieldDecl *Ivar = dyn_cast<FieldDecl>(IvarRef->getDecl()))
+ if (Ivar->isBitField())
+ return Ivar;
+
if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E))
if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl()))
if (Field->isBitField())
@@ -3172,10 +3177,10 @@ FieldDecl *Expr::getBitField() {
if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) {
if (BinOp->isAssignmentOp() && BinOp->getLHS())
- return BinOp->getLHS()->getBitField();
+ return BinOp->getLHS()->getSourceBitField();
if (BinOp->getOpcode() == BO_Comma && BinOp->getRHS())
- return BinOp->getRHS()->getBitField();
+ return BinOp->getRHS()->getSourceBitField();
}
return 0;
diff --git a/lib/Sema/SemaCast.cpp b/lib/Sema/SemaCast.cpp
index d6c378e3d4..eb11a577cb 100644
--- a/lib/Sema/SemaCast.cpp
+++ b/lib/Sema/SemaCast.cpp
@@ -1452,7 +1452,7 @@ static TryCastResult TryConstCast(Sema &Self, Expr *SrcExpr, QualType DestType,
DestType = Self.Context.getCanonicalType(DestType);
QualType SrcType = SrcExpr->getType();
if (const ReferenceType *DestTypeTmp =DestType->getAs<ReferenceType>()) {
- if (DestTypeTmp->isLValueReferenceType() && !SrcExpr->isLValue()) {
+ if (isa<LValueReferenceType>(DestTypeTmp) && !SrcExpr->isLValue()) {
// Cannot const_cast non-lvalue to lvalue reference type. But if this
// is C-style, static_cast might find a way, so we simply suggest a
// message and tell the parent to keep searching.
@@ -1460,6 +1460,16 @@ static TryCastResult TryConstCast(Sema &Self, Expr *SrcExpr, QualType DestType,
return TC_NotApplicable;
}
+ // It's not completely clear under the standard whether we can
+ // const_cast bit-field gl-values. Doing so would not be
+ // intrinsically complicated, but for now, we say no for
+ // consistency with other compilers and await the word of the
+ // committee.
+ if (SrcExpr->refersToBitField()) {
+ msg = diag::err_bad_cxx_cast_bitfield;
+ return TC_NotApplicable;
+ }
+
// C++ 5.2.11p4: An lvalue of type T1 can be [cast] to an lvalue of type T2
// [...] if a pointer to T1 can be [cast] to the type pointer to T2.
DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
diff --git a/lib/Sema/SemaChecking.cpp b/lib/Sema/SemaChecking.cpp
index e14635ee25..a0998a46c6 100644
--- a/lib/Sema/SemaChecking.cpp
+++ b/lib/Sema/SemaChecking.cpp
@@ -4311,7 +4311,7 @@ static IntRange GetExprRange(ASTContext &C, Expr *E, unsigned MaxWidth) {
IntRange::forValueOfType(C, E->getType());
}
- if (FieldDecl *BitField = E->getBitField())
+ if (FieldDecl *BitField = E->getSourceBitField())
return IntRange(BitField->getBitWidthValue(C),
BitField->getType()->isUnsignedIntegerOrEnumerationType());
@@ -4688,7 +4688,7 @@ static void AnalyzeAssignment(Sema &S, BinaryOperator *E) {
// We want to recurse on the RHS as normal unless we're assigning to
// a bitfield.
- if (FieldDecl *Bitfield = E->getLHS()->getBitField()) {
+ if (FieldDecl *Bitfield = E->getLHS()->getSourceBitField()) {
if (AnalyzeBitFieldAssignment(S, Bitfield, E->getRHS(),
E->getOperatorLoc())) {
// Recurse, ignoring any implicit conversions on the RHS.
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 0c1065813e..dd05b82236 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -3383,7 +3383,7 @@ Sema::CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
isInvalid = CheckAlignOfExpr(*this, E);
} else if (ExprKind == UETT_VecStep) {
isInvalid = CheckVecStepExpr(E);
- } else if (E->getBitField()) { // C99 6.5.3.4p1.
+ } else if (E->refersToBitField()) { // C99 6.5.3.4p1.
Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield) << 0;
isInvalid = true;
} else {
diff --git a/lib/Sema/SemaInit.cpp b/lib/Sema/SemaInit.cpp
index de93adb6be..9e8936e17b 100644
--- a/lib/Sema/SemaInit.cpp
+++ b/lib/Sema/SemaInit.cpp
@@ -3440,7 +3440,7 @@ convertQualifiersAndValueKindIfNecessary(Sema &S,
Qualifiers T1Quals,
Qualifiers T2Quals,
bool IsLValueRef) {
- bool IsNonAddressableType = Initializer->getBitField() ||
+ bool IsNonAddressableType = Initializer->refersToBitField() ||
Initializer->refersToVectorElement();
if (IsNonAddressableType) {
@@ -5225,13 +5225,18 @@ InitializationSequence::Perform(Sema &S,
}
case SK_BindReference:
- if (FieldDecl *BitField = CurInit.get()->getBitField()) {
- // References cannot bind to bit fields (C++ [dcl.init.ref]p5).
+ // References cannot bind to bit-fields (C++ [dcl.init.ref]p5).
+ if (CurInit.get()->refersToBitField()) {
+ // We don't necessarily have an unambiguous source bit-field.
+ FieldDecl *BitField = CurInit.get()->getSourceBitField();
S.Diag(Kind.getLocation(), diag::err_reference_bind_to_bitfield)
<< Entity.getType().isVolatileQualified()
- << BitField->getDeclName()
+ << (BitField ? BitField->getDeclName() : DeclarationName())
+ << (BitField != NULL)
<< CurInit.get()->getSourceRange();
- S.Diag(BitField->getLocation(), diag::note_bitfield_decl);
+ if (BitField)
+ S.Diag(BitField->getLocation(), diag::note_bitfield_decl);
+
return ExprError();
}
diff --git a/lib/Sema/SemaOverload.cpp b/lib/Sema/SemaOverload.cpp
index c11a0756e7..529ba127cb 100644
--- a/lib/Sema/SemaOverload.cpp
+++ b/lib/Sema/SemaOverload.cpp
@@ -1837,7 +1837,7 @@ bool Sema::IsIntegralPromotion(Expr *From, QualType FromType, QualType ToType) {
// conversion.
using llvm::APSInt;
if (From)
- if (FieldDecl *MemberDecl = From->getBitField()) {
+ if (FieldDecl *MemberDecl = From->getSourceBitField()) {
APSInt BitWidth;
if (FromType->isIntegralType(Context) &&
MemberDecl->getBitWidth()->isIntegerConstantExpr(BitWidth, Context)) {
diff --git a/test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5.cpp b/test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5.cpp
index 51d61a52a6..263f661208 100644
--- a/test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5.cpp
+++ b/test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5.cpp
@@ -38,3 +38,26 @@ namespace PR6066 {
return 0;
}
}
+
+namespace test3 {
+ struct A {
+ unsigned bitX : 4; // expected-note 4 {{bit-field is declared here}}
+ unsigned bitY : 4; // expected-note {{bit-field is declared here}}
+ unsigned var;
+
+ void foo();
+ };
+
+ void test(A *a) {
+ unsigned &t0 = a->bitX; // expected-error {{non-const reference cannot bind to bit-field 'bitX'}}
+ unsigned &t1 = (unsigned&) a->bitX; // expected-error {{non-const reference cannot bind to bit-field 'bitX'}}
+ unsigned &t2 = const_cast<unsigned&>(a->bitX); // expected-error {{const_cast from bit-field lvalue to reference type 'unsigned int &'}}
+ unsigned &t3 = (a->foo(), a->bitX); // expected-error {{non-const reference cannot bind to bit-field 'bitX'}}
+ unsigned &t4 = (a->var ? a->bitX : a->bitY); // expected-error {{non-const reference cannot bind to bit-field}}
+ unsigned &t5 = (a->var ? a->bitX : a->bitX); // expected-error {{non-const reference cannot bind to bit-field}}
+ unsigned &t6 = (a->var ? a->bitX : a->var); // expected-error {{non-const reference cannot bind to bit-field}}
+ unsigned &t7 = (a->var ? a->var : a->bitY); // expected-error {{non-const reference cannot bind to bit-field}}
+ unsigned &t8 = (a->bitX = 3); // expected-error {{non-const reference cannot bind to bit-field 'bitX'}}
+ unsigned &t9 = (a->bitY += 3); // expected-error {{non-const reference cannot bind to bit-field 'bitY'}}
+ }
+}
diff --git a/test/CXX/expr/expr.post/expr.const.cast/p1-0x.cpp b/test/CXX/expr/expr.post/expr.const.cast/p1-0x.cpp
index be898761fa..76ea96fe14 100644
--- a/test/CXX/expr/expr.post/expr.const.cast/p1-0x.cpp
+++ b/test/CXX/expr/expr.post/expr.const.cast/p1-0x.cpp
@@ -1,5 +1,4 @@
// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
-// expected-no-diagnostics
// The result of the expression const_cast<T>(v) is of type T. If T is
// an lvalue reference to object type, the result is an lvalue; if T
@@ -16,3 +15,19 @@ void test_classification(const int *ptr) {
int *ptr1 = const_cast<int *&&>(xvalue<const int*>());
int *ptr2 = const_cast<int *&&>(prvalue<const int*>());
}
+
+struct A {
+ volatile unsigned ubf : 4;
+ volatile unsigned uv;
+ volatile int sv;
+ void foo();
+ bool pred();
+};
+
+void test(A &a) {
+ unsigned &t0 = const_cast<unsigned&>(a.ubf); // expected-error {{const_cast from bit-field lvalue to reference type}}
+ unsigned &t1 = const_cast<unsigned&>(a.foo(), a.ubf); // expected-error {{const_cast from bit-field lvalue to reference type}}
+ unsigned &t2 = const_cast<unsigned&>(a.pred() ? a.ubf : a.ubf); // expected-error {{const_cast from bit-field lvalue to reference type}}
+ unsigned &t3 = const_cast<unsigned&>(a.pred() ? a.ubf : a.uv); // expected-error {{const_cast from bit-field lvalue to reference type}}
+ unsigned &t4 = const_cast<unsigned&>(a.pred() ? a.ubf : a.sv); // expected-error {{const_cast from rvalue to reference type}}
+}
diff --git a/test/CXX/expr/expr.unary/expr.sizeof/p1.cpp b/test/CXX/expr/expr.unary/expr.sizeof/p1.cpp
new file mode 100644
index 0000000000..6a59e3d7ae
--- /dev/null
+++ b/test/CXX/expr/expr.unary/expr.sizeof/p1.cpp
@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+struct A {
+ unsigned bitX : 4;
+ unsigned bitY : 4;
+ unsigned var;
+
+ void foo();
+};
+
+void test(A *a) {
+ int x;
+ x = sizeof(a->bitX); // expected-error {{invalid application of 'sizeof' to bit-field}}
+ x = sizeof((unsigned) a->bitX);
+ x = sizeof(a->foo(), a->bitX); // expected-error {{invalid application of 'sizeof' to bit-field}}
+ x = sizeof(a->var ? a->bitX : a->bitY); // expected-error {{invalid application of 'sizeof' to bit-field}}
+ x = sizeof(a->var ? a->bitX : a->bitX); // expected-error {{invalid application of 'sizeof' to bit-field}}
+ x = sizeof(a->bitX = 3); // expected-error {{invalid application of 'sizeof' to bit-field}}
+ x = sizeof(a->bitY += 3); // expected-error {{invalid application of 'sizeof' to bit-field}}
+}
diff --git a/test/Sema/bitfield.c b/test/Sema/bitfield.c
index a1ce894037..ab05a7773d 100644
--- a/test/Sema/bitfield.c
+++ b/test/Sema/bitfield.c
@@ -39,3 +39,18 @@ int y;
struct PR8025 {
double : 2; // expected-error{{anonymous bit-field has non-integral type 'double'}}
};
+
+struct Test4 {
+ unsigned bitX : 4;
+ unsigned bitY : 4;
+ unsigned var;
+};
+void test4(struct Test4 *t) {
+ (void) sizeof(t->bitX); // expected-error {{invalid application of 'sizeof' to bit-field}}
+ (void) sizeof((t->bitY)); // expected-error {{invalid application of 'sizeof' to bit-field}}
+ (void) sizeof(t->bitX = 4); // not a bitfield designator in C
+ (void) sizeof(t->bitX += 4); // not a bitfield designator in C
+ (void) sizeof((void) 0, t->bitX); // not a bitfield designator in C
+ (void) sizeof(t->var ? t->bitX : t->bitY); // not a bitfield designator in C
+ (void) sizeof(t->var ? t->bitX : t->bitX); // not a bitfield designator in C
+}
diff --git a/test/SemaObjCXX/references.mm b/test/SemaObjCXX/references.mm
index f63e17d98e..fa552076fb 100644
--- a/test/SemaObjCXX/references.mm
+++ b/test/SemaObjCXX/references.mm
@@ -1,5 +1,7 @@
-// RUN: %clang_cc1 -verify -emit-llvm -o - %s
-// expected-no-diagnostics
+// RUN: %clang_cc1 -verify -o - %s
+
+__attribute__((objc_root_class))
+@interface Root @end
// Test reference binding.
@@ -8,7 +10,7 @@ typedef struct {
int f1;
} T;
-@interface A
+@interface A : Root
@property (assign) T p0;
@property (assign) T& p1;
@end
@@ -61,3 +63,14 @@ void f6(baz* x) {
f5d(ToBar());
(void)((foo&)ToBar());
}
+
+// rdar://13794269
+@interface B : Root @end
+@implementation B {
+ unsigned bf : 4; // expected-note {{declared here}}
+}
+
+- (void) foo {
+ unsigned &i = bf; // expected-error {{non-const reference cannot bind to bit-field 'bf'}}
+}
+@end
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-25 01:05:22 +0000