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Make attribute instantiation instantiate all attributes, not just the first of 

each kind.

Attribute instantiation would previously default to instantiating each kind of
attribute only once. This was overridden by a flag whose intended purpose was
to permit attributes from a prior declaration to be inherited onto a new
declaration even if that new declaration had its own copy of the attribute.
This is the wrong behavior: when instantiating attributes from a template, we
should always instantiate all the attributes that were written on that
template.

This patch renames the flag in the Attr class (and TableGen sources) to more
clearly identify what it's actually for, and removes the usage of the flag from
template instantiation. I also removed the flag from AlignedAttr, which was
only added to work around the incorrect suppression of duplicate attribute
instantiation.

llvm-svn: 321834
This commit is contained in:
Richard Smith 2018-01-04 23:42:29 +00:00
parent 45925d77d6
commit 33bddbd64b
7 changed files with 97 additions and 52 deletions
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37
clang/include/clang/AST/Attr.h
View File

@ -52,8 +52,10 @@ protected:
unsigned Inherited : 1;
unsigned IsPackExpansion : 1;
unsigned Implicit : 1;
// FIXME: These are properties of the attribute kind, not state for this
// instance of the attribute.
unsigned IsLateParsed : 1;
unsigned DuplicatesAllowed : 1;
unsigned InheritEvenIfAlreadyPresent : 1;
void *operator new(size_t bytes) noexcept {
llvm_unreachable("Attrs cannot be allocated with regular 'new'.");
@ -74,10 +76,10 @@ public:
protected:
Attr(attr::Kind AK, SourceRange R, unsigned SpellingListIndex,
bool IsLateParsed, bool DuplicatesAllowed)
bool IsLateParsed)
: Range(R), AttrKind(AK), SpellingListIndex(SpellingListIndex),
Inherited(false), IsPackExpansion(false), Implicit(false),
IsLateParsed(IsLateParsed), DuplicatesAllowed(DuplicatesAllowed) {}
IsLateParsed(IsLateParsed), InheritEvenIfAlreadyPresent(false) {}
public:
@ -109,18 +111,13 @@ public:
// Pretty print this attribute.
void printPretty(raw_ostream &OS, const PrintingPolicy &Policy) const;
/// \brief By default, attributes cannot be duplicated when being merged;
/// however, an attribute can override this. Returns true if the attribute
/// can be duplicated when merging.
bool duplicatesAllowed() const { return DuplicatesAllowed; }
};
class StmtAttr : public Attr {
protected:
StmtAttr(attr::Kind AK, SourceRange R, unsigned SpellingListIndex,
bool IsLateParsed, bool DuplicatesAllowed)
: Attr(AK, R, SpellingListIndex, IsLateParsed, DuplicatesAllowed) {}
bool IsLateParsed)
: Attr(AK, R, SpellingListIndex, IsLateParsed) {}
public:
static bool classof(const Attr *A) {
@ -132,12 +129,20 @@ public:
class InheritableAttr : public Attr {
protected:
InheritableAttr(attr::Kind AK, SourceRange R, unsigned SpellingListIndex,
bool IsLateParsed, bool DuplicatesAllowed)
: Attr(AK, R, SpellingListIndex, IsLateParsed, DuplicatesAllowed) {}
bool IsLateParsed, bool InheritEvenIfAlreadyPresent)
: Attr(AK, R, SpellingListIndex, IsLateParsed) {
this->InheritEvenIfAlreadyPresent = InheritEvenIfAlreadyPresent;
}
public:
void setInherited(bool I) { Inherited = I; }
/// Should this attribute be inherited from a prior declaration even if it's
/// explicitly provided in the current declaration?
bool shouldInheritEvenIfAlreadyPresent() const {
return InheritEvenIfAlreadyPresent;
}
// Implement isa/cast/dyncast/etc.
static bool classof(const Attr *A) {
return A->getKind() >= attr::FirstInheritableAttr &&
@ -148,9 +153,9 @@ public:
class InheritableParamAttr : public InheritableAttr {
protected:
InheritableParamAttr(attr::Kind AK, SourceRange R, unsigned SpellingListIndex,
bool IsLateParsed, bool DuplicatesAllowed)
bool IsLateParsed, bool InheritEvenIfAlreadyPresent)
: InheritableAttr(AK, R, SpellingListIndex, IsLateParsed,
DuplicatesAllowed) {}
InheritEvenIfAlreadyPresent) {}
public:
// Implement isa/cast/dyncast/etc.
@ -166,9 +171,9 @@ class ParameterABIAttr : public InheritableParamAttr {
protected:
ParameterABIAttr(attr::Kind AK, SourceRange R,
unsigned SpellingListIndex, bool IsLateParsed,
bool DuplicatesAllowed)
bool InheritEvenIfAlreadyPresent)
: InheritableParamAttr(AK, R, SpellingListIndex, IsLateParsed,
DuplicatesAllowed) {}
InheritEvenIfAlreadyPresent) {}
public:
ParameterABI getABI() const {

44
clang/include/clang/Basic/Attr.td
View File

@ -441,9 +441,6 @@ class Attr {
// Set to true if all of the attribute's arguments should be parsed in an
// unevaluated context.
bit ParseArgumentsAsUnevaluated = 0;
// Set to true if this attribute can be duplicated on a subject when merging
// attributes. By default, attributes are not merged.
bit DuplicatesAllowedWhileMerging = 0;
// Set to true if this attribute meaningful when applied to or inherited
// in a class template definition.
bit MeaningfulToClassTemplateDefinition = 0;
@ -478,7 +475,11 @@ class TypeAttr : Attr {
class StmtAttr : Attr;
/// An inheritable attribute is inherited by later redeclarations.
class InheritableAttr : Attr;
class InheritableAttr : Attr {
// Set to true if this attribute can be duplicated on a subject when inheriting
// attributes from prior declarations.
bit InheritEvenIfAlreadyPresent = 0;
}
/// A target-specific attribute. This class is meant to be used as a mixin
/// with InheritableAttr or Attr depending on the attribute's needs.
@ -552,7 +553,6 @@ def Aligned : InheritableAttr {
Keyword<"_Alignas">]>,
Accessor<"isDeclspec",[Declspec<"align">]>];
let Documentation = [Undocumented];
let DuplicatesAllowedWhileMerging = 1;
}
def AlignValue : Attr {
@ -710,7 +710,7 @@ static llvm::StringRef canonicalizePlatformName(llvm::StringRef Platform) {
.Default(Platform);
} }];
let HasCustomParsing = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Subjects = SubjectList<[Named]>;
let Documentation = [AvailabilityDocs];
}
@ -1380,7 +1380,7 @@ def NonNull : InheritableParamAttr {
return false;
} }];
// FIXME: We should merge duplicates into a single nonnull attribute.
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Documentation = [NonNullDocs];
}
@ -1917,7 +1917,7 @@ def DiagnoseIf : InheritableAttr {
["DT_Error", "DT_Warning"]>,
BoolArgument<"ArgDependent", 0, /*fake*/ 1>,
NamedArgument<"Parent", 0, /*fake*/ 1>];
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let LateParsed = 1;
let AdditionalMembers = [{
bool isError() const { return diagnosticType == DT_Error; }
@ -2160,7 +2160,7 @@ def AssertCapability : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Args = [VariadicExprArgument<"Args">];
let Accessors = [Accessor<"isShared",
[Clang<"assert_shared_capability">]>];
@ -2176,7 +2176,7 @@ def AcquireCapability : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Args = [VariadicExprArgument<"Args">];
let Accessors = [Accessor<"isShared",
[Clang<"acquire_shared_capability">,
@ -2192,7 +2192,7 @@ def TryAcquireCapability : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Args = [ExprArgument<"SuccessValue">, VariadicExprArgument<"Args">];
let Accessors = [Accessor<"isShared",
[Clang<"try_acquire_shared_capability">]>];
@ -2208,7 +2208,7 @@ def ReleaseCapability : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Args = [VariadicExprArgument<"Args">];
let Accessors = [Accessor<"isShared",
[Clang<"release_shared_capability">]>,
@ -2227,7 +2227,7 @@ def RequiresCapability : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Subjects = SubjectList<[Function]>;
let Accessors = [Accessor<"isShared", [Clang<"requires_shared_capability">,
Clang<"shared_locks_required">]>];
@ -2246,7 +2246,7 @@ def GuardedBy : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Subjects = SubjectList<[Field, SharedVar]>;
let Documentation = [Undocumented];
}
@ -2257,7 +2257,7 @@ def PtGuardedBy : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Subjects = SubjectList<[Field, SharedVar]>;
let Documentation = [Undocumented];
}
@ -2268,7 +2268,7 @@ def AcquiredAfter : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Subjects = SubjectList<[Field, SharedVar]>;
let Documentation = [Undocumented];
}
@ -2279,7 +2279,7 @@ def AcquiredBefore : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Subjects = SubjectList<[Field, SharedVar]>;
let Documentation = [Undocumented];
}
@ -2290,7 +2290,7 @@ def AssertExclusiveLock : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Subjects = SubjectList<[Function]>;
let Documentation = [Undocumented];
}
@ -2301,7 +2301,7 @@ def AssertSharedLock : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Subjects = SubjectList<[Function]>;
let Documentation = [Undocumented];
}
@ -2314,7 +2314,7 @@ def ExclusiveTrylockFunction : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Subjects = SubjectList<[Function]>;
let Documentation = [Undocumented];
}
@ -2327,7 +2327,7 @@ def SharedTrylockFunction : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Subjects = SubjectList<[Function]>;
let Documentation = [Undocumented];
}
@ -2348,7 +2348,7 @@ def LocksExcluded : InheritableAttr {
let LateParsed = 1;
let TemplateDependent = 1;
let ParseArgumentsAsUnevaluated = 1;
let DuplicatesAllowedWhileMerging = 1;
let InheritEvenIfAlreadyPresent = 1;
let Subjects = SubjectList<[Function]>;
let Documentation = [Undocumented];
}

2
clang/lib/Sema/SemaDecl.cpp
View File

@ -2495,7 +2495,7 @@ static bool mergeDeclAttribute(Sema &S, NamedDecl *D,
else if (const auto *UA = dyn_cast<UuidAttr>(Attr))
NewAttr = S.mergeUuidAttr(D, UA->getRange(), AttrSpellingListIndex,
UA->getGuid());
else if (Attr->duplicatesAllowed() || !DeclHasAttr(D, Attr))
else if (Attr->shouldInheritEvenIfAlreadyPresent() || !DeclHasAttr(D, Attr))
NewAttr = cast<InheritableAttr>(Attr->clone(S.Context));
if (NewAttr) {

13
clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
View File

@ -343,14 +343,6 @@ static void instantiateOMPDeclareSimdDeclAttr(
Attr.getRange());
}
static bool DeclContainsAttr(const Decl *D, const Attr *NewAttr) {
if (!D->hasAttrs() || NewAttr->duplicatesAllowed())
return false;
return llvm::find_if(D->getAttrs(), [NewAttr](const Attr *Attr) {
return Attr->getKind() == NewAttr->getKind();
}) != D->getAttrs().end();
}
void Sema::InstantiateAttrsForDecl(
const MultiLevelTemplateArgumentList &TemplateArgs, const Decl *Tmpl,
Decl *New, LateInstantiatedAttrVec *LateAttrs,
@ -365,7 +357,7 @@ void Sema::InstantiateAttrsForDecl(
Attr *NewAttr = sema::instantiateTemplateAttributeForDecl(
TmplAttr, Context, *this, TemplateArgs);
if (NewAttr && !DeclContainsAttr(New, NewAttr))
if (NewAttr)
New->addAttr(NewAttr);
}
}
@ -470,8 +462,7 @@ void Sema::InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs,
Attr *NewAttr = sema::instantiateTemplateAttribute(TmplAttr, Context,
*this, TemplateArgs);
if (NewAttr && !DeclContainsAttr(New, NewAttr))
if (NewAttr)
New->addAttr(NewAttr);
}
}

11
clang/test/SemaTemplate/attributes.cpp
View File

@ -1,4 +1,5 @@
// RUN: %clang_cc1 -std=gnu++11 -fsyntax-only -verify %s
// RUN: not %clang_cc1 -std=gnu++11 -ast-dump %s | FileCheck %s
namespace attribute_aligned {
template<int N>
@ -52,3 +53,13 @@ namespace PR9049 {
template<typename T>
inline void WBCFRelease(__attribute__((cf_consumed)) T aValue) { if(aValue) CFRelease(aValue); }
}
// CHECK: FunctionTemplateDecl {{.*}} HasAnnotations
// CHECK: AnnotateAttr {{.*}} "ANNOTATE_BAR"
// CHECK: AnnotateAttr {{.*}} "ANNOTATE_FOO"
// CHECK: FunctionDecl {{.*}} HasAnnotations
// CHECK: TemplateArgument type 'int'
// CHECK: AnnotateAttr {{.*}} "ANNOTATE_BAR"
// CHECK: AnnotateAttr {{.*}} "ANNOTATE_FOO"
template<typename T> [[clang::annotate("ANNOTATE_FOO"), clang::annotate("ANNOTATE_BAR")]] void HasAnnotations();
void UseAnnotations() { HasAnnotations<int>(); }

30
clang/test/SemaTemplate/warn-thread-safety-analysis.cpp Normal file
View File

@ -0,0 +1,30 @@
// RUN: %clang_cc1 -std=c++11 %s -verify -Wthread-safety-analysis
class Mutex {
public:
void Lock() __attribute__((exclusive_lock_function()));
void Unlock() __attribute__((unlock_function()));
};
class A {
public:
Mutex mu1, mu2;
void foo() __attribute__((exclusive_locks_required(mu1))) __attribute__((exclusive_locks_required(mu2))) {}
template <class T> void bar() __attribute__((exclusive_locks_required(mu1))) __attribute__((exclusive_locks_required(mu2))) {
foo();
}
};
void f() {
A a;
a.mu1.Lock();
a.mu2.Lock();
a.bar<int>();
a.mu2.Unlock();
a.bar<int>(); // expected-warning {{calling function 'bar' requires holding mutex 'a.mu2' exclusively}}
a.mu1.Unlock();
a.bar<int>(); // expected-warning {{calling function 'bar' requires holding mutex 'a.mu1' exclusively}} \
expected-warning {{calling function 'bar' requires holding mutex 'a.mu2' exclusively}}
}

12
clang/utils/TableGen/ClangAttrEmitter.cpp
View File

@ -2065,10 +2065,13 @@ void EmitClangAttrClass(RecordKeeper &Records, raw_ostream &OS) {
ArrayRef<std::pair<Record *, SMRange>> Supers = R.getSuperClasses();
assert(!Supers.empty() && "Forgot to specify a superclass for the attr");
std::string SuperName;
bool Inheritable = false;
for (const auto &Super : llvm::reverse(Supers)) {
const Record *R = Super.first;
if (R->getName() != "TargetSpecificAttr" && SuperName.empty())
SuperName = R->getName();
if (R->getName() == "InheritableAttr")
Inheritable = true;
}
OS << "class " << R.getName() << "Attr : public " << SuperName << " {\n";
@ -2162,8 +2165,13 @@ void EmitClangAttrClass(RecordKeeper &Records, raw_ostream &OS) {
OS << " )\n";
OS << " : " << SuperName << "(attr::" << R.getName() << ", R, SI, "
<< ( R.getValueAsBit("LateParsed") ? "true" : "false" ) << ", "
<< ( R.getValueAsBit("DuplicatesAllowedWhileMerging") ? "true" : "false" ) << ")\n";
<< ( R.getValueAsBit("LateParsed") ? "true" : "false" );
if (Inheritable) {
OS << ", "
<< (R.getValueAsBit("InheritEvenIfAlreadyPresent") ? "true"
: "false");
}
OS << ")\n";
for (auto const &ai : Args) {
OS << " , ";