Hi all, I've been working on #23529.
The abi tag mangling implemented by gcc is horrible, but I think my patch covers most of the incompatibilities with gcc5. There might be some bugs with substitutions, although I have to come up with a test case for that to see what gcc does... Test cases comparing gcc and patched clang++: http://files.stbuehler.de/test-itanium-mangle.html (generated with http://files.stbuehler.de/test-itanium-mangle.sh, also attached) regards, Stefan
Author: Stefan Bühler <stbueh...@web.de>
add gcc abi_tag support
- parse abi_tag attribute
- emit abi tags in name Itanium Mangling
- try to emit the same tags as gcc5
diff --git a/include/clang/Basic/Attr.td b/include/clang/Basic/Attr.td
index 4b8a7b7..8f8b9ba 100644
--- a/include/clang/Basic/Attr.td
+++ b/include/clang/Basic/Attr.td
@@ -344,6 +344,14 @@ class IgnoredAttr : Attr {
// Attributes begin here
//
+def AbiTag : Attr {
+ let Spellings = [GCC<"abi_tag">];
+ let Args = [VariadicStringArgument<"Tags">];
+ let Subjects = SubjectList<[Struct, Var, Function, Namespace], ErrorDiag,
+ "ExpectedStructClassVariableFunctionMethodOrInlineNamespace">;
+ let Documentation = [Undocumented];
+}
+
def AddressSpace : TypeAttr {
let Spellings = [GNU<"address_space">];
let Args = [IntArgument<"AddressSpace">];
diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index 6ac5748..17f46fa 100644
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -2336,7 +2336,8 @@ def warn_attribute_wrong_decl_type : Warning<
"Objective-C instance methods|init methods of interface or class extension declarations|"
"variables, functions and classes|Objective-C protocols|"
"functions and global variables|structs, unions, and typedefs|structs and typedefs|"
- "interface or protocol declarations|kernel functions}1">,
+ "interface or protocol declarations|kernel functions|"
+ "structs, classes, variables, functions, methods and inline namespaces}1">,
InGroup<IgnoredAttributes>;
def err_attribute_wrong_decl_type : Error<warn_attribute_wrong_decl_type.Text>;
def warn_type_attribute_wrong_type : Warning<
@@ -4013,6 +4014,13 @@ def err_definition_of_explicitly_defaulted_member : Error<
def err_redefinition_extern_inline : Error<
"redefinition of a 'extern inline' function %0 is not supported in "
"%select{C99 mode|C++}1">;
+def err_attr_abi_tag_only_on_inline_namespace :
+ Error<"abi_tag attribute only allowed on inline namespaces">;
+def err_abi_tag_on_redeclaration :
+ Error<"cannot add abi_tag attribute in redeclaration">;
+def err_new_abi_tag_on_redeclaration :
+ Error<"abi_tag %0 missing in original declaration">;
+
def note_deleted_dtor_no_operator_delete : Note<
"virtual destructor requires an unambiguous, accessible 'operator delete'">;
diff --git a/include/clang/Sema/AttributeList.h b/include/clang/Sema/AttributeList.h
index ca456b2..c3f0841 100644
--- a/include/clang/Sema/AttributeList.h
+++ b/include/clang/Sema/AttributeList.h
@@ -852,7 +852,8 @@ enum AttributeDeclKind {
ExpectedStructOrUnionOrTypedef,
ExpectedStructOrTypedef,
ExpectedObjectiveCInterfaceOrProtocol,
- ExpectedKernelFunction
+ ExpectedKernelFunction,
+ ExpectedStructClassVariableFunctionMethodOrInlineNamespace
};
} // end namespace clang
diff --git a/lib/AST/ItaniumMangle.cpp b/lib/AST/ItaniumMangle.cpp
index 3f40743..bb16ebe 100644
--- a/lib/AST/ItaniumMangle.cpp
+++ b/lib/AST/ItaniumMangle.cpp
@@ -214,6 +214,8 @@ public:
class CXXNameMangler {
ItaniumMangleContextImpl &Context;
raw_ostream &Out;
+ bool NullOut = false;
+ bool DisableDerivedAbiTags = false;
/// The "structor" is the top-level declaration being mangled, if
/// that's not a template specialization; otherwise it's the pattern
@@ -263,6 +265,167 @@ class CXXNameMangler {
} FunctionTypeDepth;
+ // abi_tag is a gcc attribute, taking one or more strings called "tags".
+ //
+ // the goal is to annotage against which version of a library an object was
+ // build and to be able to provide backwards compatibility ("dual abi").
+ //
+ // for this the emitted mangled names have to be different, while you don't
+ // want the user to have to use different names in the source.
+ //
+ // the abi_tag can be present on Struct, Var and Function declarations as
+ // "explicit" tag, and on inline Namespace as "implicit" tag. Explicit tags
+ // are always emitted after the unqualified name, and (implicit) tags on
+ // namespace are not.
+ //
+ // For functions and variables there is a set of "implicitly available"
+ // tags. These tags are: all tags from the namespace/structs the name is
+ // embedded in, all tags from any template arguments of the name, and, for
+ // functions, alls tags used anywhere in the <bare-function-type> (i.e.
+ // parameters and sometimes the return type).
+ //
+ // For functions this is basically the list of all tags from the signature
+ // without the unqualified name and usually without the return type of the
+ // function. In `operator Type()` Type is NOT part of that list, as it is
+ // part of the unqualified name!
+ //
+ // Now all tags from the function return type/variable type which are not
+ // "implicitly available" must be added to the explicit list of tags, and
+ // are emitted after the unqualified name.
+ //
+ // Example:
+ // namespace std {
+ // inline namespace __cxx11 __attribute__((__abi_tag__("cxx11"))) { }
+ // inline namespace __cxx11 {
+ // struct string { };
+ // }
+ // }
+ //
+ // std::string foo(); // needs abi tag "cxx11" on foo
+ // std::string foo(std::string); // does NOT need abi tag "cxx11" on foo
+ // __attribute__((__abi_tag__("cxx11")))
+ // std::string foo2(std::string); // emit abi tag "cxx11" on foo anyway
+ //
+ // The tags are sorted by name before emitting, and are serialized as
+ // <abitag> ::= B <"tag" source-name>
+
+ typedef SmallVector<StringRef, 4> AbiTagList;
+
+ // state to gather all implicit and explicit tags used in a mangled name.
+ // must always have an instance of this while emitting any name to keep
+ // track.
+ //
+ // TODO(abitags): how to handle substituted names? they should add the tags used in
+ // the substitution to the list of available tags.
+ class AbiTagState final {
+ public:
+ //! all abi tags used implicitly or explicitly
+ std::set<StringRef> UsedAbiTags;
+ //! all explicit abi tags (i.e. not from namespace)
+ std::set<StringRef> EmittedAbiTags;
+
+ AbiTagState* &LinkHead;
+ AbiTagState *Parent{nullptr};
+
+ bool LinkActive{false};
+
+ explicit AbiTagState(AbiTagState* &linkHead)
+ : LinkHead(linkHead) {
+ Parent = LinkHead;
+ LinkHead = this;
+ LinkActive = true;
+ }
+
+ // no copy, no move
+ AbiTagState(AbiTagState const&) = delete;
+ AbiTagState& operator=(AbiTagState const&) = delete;
+
+ ~AbiTagState() {
+ pop();
+ }
+
+ void pop() {
+ if (!LinkActive) return;
+
+ assert(LinkHead == this && "abi tag link head must point to us on destruction");
+ LinkActive = false;
+ if (Parent) {
+ Parent->UsedAbiTags.insert(UsedAbiTags.begin(), UsedAbiTags.end());
+ Parent->EmittedAbiTags.insert(EmittedAbiTags.begin(), EmittedAbiTags.end());
+ }
+ LinkHead = Parent;
+ }
+
+ void write(raw_ostream &Out, const NamedDecl *ND, const AbiTagList *AdditionalAbiTags) {
+ ND = cast<NamedDecl>(ND->getCanonicalDecl());
+
+ if (dyn_cast<FunctionDecl>(ND) || dyn_cast<VarDecl>(ND)) {
+ // assert(AdditionalAbiTags && "function and variables need a list of additional abi tags");
+ } else {
+ assert(!AdditionalAbiTags && "only function and variables need a list of additional abi tags");
+ if (const auto* NS = dyn_cast<NamespaceDecl>(ND)) {
+ if (const auto* AbiTag = NS->getAttr<AbiTagAttr>()) {
+ for (const auto& Tag: AbiTag->tags()) {
+ UsedAbiTags.insert(Tag);
+ }
+ }
+ // don't emit abi tags for namespaces
+ return;
+ }
+ }
+
+ AbiTagList TagList;
+ if (const auto* AbiTag = ND->getAttr<AbiTagAttr>()) {
+ for (const auto& Tag: AbiTag->tags()) {
+ UsedAbiTags.insert(Tag);
+ // AbiTag->tags() is sorted and has no duplicates
+ TagList.push_back(Tag);
+ }
+ }
+
+ if (AdditionalAbiTags) {
+ for (const auto& Tag: *AdditionalAbiTags) {
+ UsedAbiTags.insert(Tag);
+ if (std::find(TagList.begin(), TagList.end(), Tag) == TagList.end()) {
+ // don't insert duplicates
+ TagList.push_back(Tag);
+ }
+ }
+ // AbiTag->tags() are already sorted; only add if we had additional tags
+ std::sort(TagList.begin(), TagList.end());
+ }
+
+ writeSortedUniqueAbiTags(Out, TagList);
+ }
+
+ protected:
+ template<typename TagList>
+ void writeSortedUniqueAbiTags(raw_ostream &Out, TagList const& AbiTags) {
+ for (const auto& Tag: AbiTags) {
+ EmittedAbiTags.insert(Tag);
+ Out << "B";
+ Out << Tag.size();
+ Out << Tag;
+ }
+ }
+ } *AbiTags = nullptr;
+ AbiTagState AbiTagsRoot{AbiTags};
+
+ struct TemporaryDisableDerivedAbiTags {
+ bool& StateRef;
+ bool OldState;
+
+ TemporaryDisableDerivedAbiTags(bool& State, bool Disable = true)
+ : StateRef(State) {
+ OldState = StateRef;
+ StateRef = Disable;
+ }
+ TemporaryDisableDerivedAbiTags(TemporaryDisableDerivedAbiTags const&) = delete;
+ ~TemporaryDisableDerivedAbiTags() {
+ StateRef = OldState;
+ }
+ };
+
llvm::DenseMap<uintptr_t, unsigned> Substitutions;
ASTContext &getASTContext() const { return Context.getASTContext(); }
@@ -285,6 +448,10 @@ public:
: Context(C), Out(Out_), Structor(getStructor(D)), StructorType(Type),
SeqID(0) { }
+ CXXNameMangler(CXXNameMangler &Outer, llvm::raw_null_ostream &Out_)
+ : Context(Outer.Context), Out(Out_), NullOut(true), Structor(Outer.Structor), StructorType(Outer.StructorType),
+ SeqID(Outer.SeqID) { }
+
#if MANGLE_CHECKER
~CXXNameMangler() {
if (Out.str()[0] == '\01')
@@ -298,18 +465,21 @@ public:
#endif
raw_ostream &getStream() { return Out; }
+ void disableDerivedAbiTags() { DisableDerivedAbiTags = true; }
+
void mangle(const NamedDecl *D);
void mangleCallOffset(int64_t NonVirtual, int64_t Virtual);
void mangleNumber(const llvm::APSInt &I);
void mangleNumber(int64_t Number);
void mangleFloat(const llvm::APFloat &F);
- void mangleFunctionEncoding(const FunctionDecl *FD);
+ void mangleFunctionEncoding(const FunctionDecl *FD, bool ExcludeUnqualifiedName = false);
void mangleSeqID(unsigned SeqID);
- void mangleName(const NamedDecl *ND);
+ void mangleName(const NamedDecl *ND, bool ExcludeUnqualifiedName = false);
void mangleType(QualType T);
void mangleNameOrStandardSubstitution(const NamedDecl *ND);
private:
+ void writeAbiTags(const NamedDecl *ND, const AbiTagList *AdditionalAbiTags = nullptr);
bool mangleSubstitution(const NamedDecl *ND);
bool mangleSubstitution(QualType T);
@@ -336,31 +506,49 @@ private:
DeclarationName name,
unsigned KnownArity = UnknownArity);
- void mangleName(const TemplateDecl *TD,
+ void mangleFunctionEncodingBareType(const FunctionDecl *FD);
+
+ void mangleNameWithAbiTags(const NamedDecl *ND,
+ const AbiTagList *AdditionalAbiTags,
+ bool ExcludeUnqualifiedName);
+ void mangleTemplateName(const TemplateDecl *TD,
+ const AbiTagList *AdditionalAbiTags,
+ bool ExcludeUnqualifiedName,
const TemplateArgument *TemplateArgs,
unsigned NumTemplateArgs);
- void mangleUnqualifiedName(const NamedDecl *ND) {
- mangleUnqualifiedName(ND, ND->getDeclName(), UnknownArity);
+ void mangleUnqualifiedName(const NamedDecl *ND, const AbiTagList *AdditionalAbiTags) {
+ mangleUnqualifiedName(ND, ND->getDeclName(), UnknownArity, AdditionalAbiTags);
}
void mangleUnqualifiedName(const NamedDecl *ND, DeclarationName Name,
- unsigned KnownArity);
- void mangleUnscopedName(const NamedDecl *ND);
- void mangleUnscopedTemplateName(const TemplateDecl *ND);
- void mangleUnscopedTemplateName(TemplateName);
+ unsigned KnownArity, const AbiTagList *AdditionalAbiTags);
+ void mangleUnscopedName(const NamedDecl *ND, const AbiTagList *AdditionalAbiTags);
+ void mangleUnscopedTemplateName(const TemplateDecl *ND,
+ const AbiTagList *AdditionalAbiTags);
+ void mangleUnscopedTemplateName(TemplateName,
+ const AbiTagList *AdditionalAbiTags);
void mangleSourceName(const IdentifierInfo *II);
- void mangleLocalName(const Decl *D);
+ void mangleLocalName(const Decl *D,
+ const AbiTagList *AdditionalAbiTags,
+ bool ExcludeUnqualifiedName);
void mangleBlockForPrefix(const BlockDecl *Block);
void mangleUnqualifiedBlock(const BlockDecl *Block);
void mangleLambda(const CXXRecordDecl *Lambda);
void mangleNestedName(const NamedDecl *ND, const DeclContext *DC,
- bool NoFunction=false);
+ const AbiTagList *AdditionalAbiTags,
+ bool NoFunction,
+ bool ExcludeUnqualifiedName);
void mangleNestedName(const TemplateDecl *TD,
+ const AbiTagList *AdditionalAbiTags,
+ bool ExcludeUnqualifiedName,
const TemplateArgument *TemplateArgs,
unsigned NumTemplateArgs);
void manglePrefix(NestedNameSpecifier *qualifier);
void manglePrefix(const DeclContext *DC, bool NoFunction=false);
void manglePrefix(QualType type);
- void mangleTemplatePrefix(const TemplateDecl *ND, bool NoFunction=false);
+ void mangleTemplatePrefix(const TemplateDecl *ND,
+ const AbiTagList *AdditionalAbiTags,
+ bool NoFunction = false,
+ bool ExcludeUnqualifiedName = false);
void mangleTemplatePrefix(TemplateName Template);
bool mangleUnresolvedTypeOrSimpleId(QualType DestroyedType,
StringRef Prefix = "");
@@ -406,6 +594,10 @@ private:
void mangleTemplateParameter(unsigned Index);
void mangleFunctionParam(const ParmVarDecl *parm);
+
+ std::set<StringRef> getTagsFromPrefixAndTemplateArguments(const NamedDecl *ND);
+ AbiTagList makeAdditionalTagsForFunction(const FunctionDecl *FD);
+ AbiTagList makeAdditionalTagsForVariable(const VarDecl *VD);
};
}
@@ -456,6 +648,11 @@ bool ItaniumMangleContextImpl::shouldMangleCXXName(const NamedDecl *D) {
return true;
}
+void CXXNameMangler::writeAbiTags(const NamedDecl *ND, const AbiTagList *AdditionalAbiTags) {
+ assert(AbiTags && "require AbiTagState");
+ if (AbiTags) AbiTags->write(Out, ND, DisableDerivedAbiTags ? nullptr : AdditionalAbiTags);
+}
+
void CXXNameMangler::mangle(const NamedDecl *D) {
// <mangled-name> ::= _Z <encoding>
// ::= <data name>
@@ -471,14 +668,28 @@ void CXXNameMangler::mangle(const NamedDecl *D) {
mangleName(cast<FieldDecl>(D));
}
-void CXXNameMangler::mangleFunctionEncoding(const FunctionDecl *FD) {
- // <encoding> ::= <function name> <bare-function-type>
- mangleName(FD);
-
+void CXXNameMangler::mangleFunctionEncoding(const FunctionDecl *FD, bool ExcludeUnqualifiedName) {
// Don't mangle in the type if this isn't a decl we should typically mangle.
- if (!Context.shouldMangleDeclName(FD))
+ if (!Context.shouldMangleDeclName(FD)) {
+ mangleNameWithAbiTags(FD, /* AdditionalAbiTags */ nullptr, ExcludeUnqualifiedName);
return;
+ }
+
+ // <encoding> ::= <function name> <bare-function-type>
+ if (ExcludeUnqualifiedName)
+ {
+ // running makeAdditionalTagsForFunction would loop, don't need it here anyway
+ mangleNameWithAbiTags(FD, /* AdditionalAbiTags */ nullptr, ExcludeUnqualifiedName);
+ } else {
+ AbiTagList AdditionalAbiTags = makeAdditionalTagsForFunction(FD);
+ mangleNameWithAbiTags(FD, &AdditionalAbiTags, ExcludeUnqualifiedName);
+ }
+
+ mangleFunctionEncodingBareType(FD);
+}
+
+void CXXNameMangler::mangleFunctionEncodingBareType(const FunctionDecl *FD) {
if (FD->hasAttr<EnableIfAttr>()) {
FunctionTypeDepthState Saved = FunctionTypeDepth.push();
Out << "Ua9enable_ifI";
@@ -524,7 +735,7 @@ void CXXNameMangler::mangleFunctionEncoding(const FunctionDecl *FD) {
FD = PrimaryTemplate->getTemplatedDecl();
}
- mangleBareFunctionType(FD->getType()->getAs<FunctionType>(),
+ mangleBareFunctionType(FD->getType()->getAs<FunctionType>(),
MangleReturnType);
}
@@ -582,7 +793,21 @@ isTemplate(const NamedDecl *ND, const TemplateArgumentList *&TemplateArgs) {
return nullptr;
}
-void CXXNameMangler::mangleName(const NamedDecl *ND) {
+// must not be run from mangleLocalName for the <entity name> as it would loop otherwise.
+void CXXNameMangler::mangleName(const NamedDecl *ND, bool ExcludeUnqualifiedName) {
+ if (!ExcludeUnqualifiedName) {
+ if (const VarDecl *VD = dyn_cast<VarDecl>(ND)) {
+ AbiTagList VariableAdditionalAbiTags = makeAdditionalTagsForVariable(VD);
+ mangleNameWithAbiTags(VD, &VariableAdditionalAbiTags, ExcludeUnqualifiedName);
+ return;
+ }
+ }
+ mangleNameWithAbiTags(ND, nullptr, ExcludeUnqualifiedName);
+}
+
+void CXXNameMangler::mangleNameWithAbiTags(const NamedDecl *ND,
+ const AbiTagList *AdditionalAbiTags,
+ bool ExcludeUnqualifiedName) {
// <name> ::= <nested-name>
// ::= <unscoped-name>
// ::= <unscoped-template-name> <template-args>
@@ -598,7 +823,7 @@ void CXXNameMangler::mangleName(const NamedDecl *ND) {
while (!DC->isNamespace() && !DC->isTranslationUnit())
DC = getEffectiveParentContext(DC);
else if (GetLocalClassDecl(ND)) {
- mangleLocalName(ND);
+ mangleLocalName(ND, AdditionalAbiTags, ExcludeUnqualifiedName);
return;
}
@@ -608,76 +833,88 @@ void CXXNameMangler::mangleName(const NamedDecl *ND) {
// Check if we have a template.
const TemplateArgumentList *TemplateArgs = nullptr;
if (const TemplateDecl *TD = isTemplate(ND, TemplateArgs)) {
- mangleUnscopedTemplateName(TD);
+ if (!ExcludeUnqualifiedName)
+ mangleUnscopedTemplateName(TD, AdditionalAbiTags);
mangleTemplateArgs(*TemplateArgs);
return;
}
- mangleUnscopedName(ND);
+ if (!ExcludeUnqualifiedName)
+ mangleUnscopedName(ND, AdditionalAbiTags);
return;
}
if (isLocalContainerContext(DC)) {
- mangleLocalName(ND);
+ mangleLocalName(ND, AdditionalAbiTags, ExcludeUnqualifiedName);
return;
}
- mangleNestedName(ND, DC);
+ mangleNestedName(ND, DC, AdditionalAbiTags, /* NoFunction */ false, ExcludeUnqualifiedName);
}
-void CXXNameMangler::mangleName(const TemplateDecl *TD,
- const TemplateArgument *TemplateArgs,
- unsigned NumTemplateArgs) {
+
+void CXXNameMangler::mangleTemplateName(const TemplateDecl *TD,
+ const AbiTagList *AdditionalAbiTags,
+ bool ExcludeUnqualifiedName,
+ const TemplateArgument *TemplateArgs,
+ unsigned NumTemplateArgs) {
const DeclContext *DC = IgnoreLinkageSpecDecls(getEffectiveDeclContext(TD));
if (DC->isTranslationUnit() || isStdNamespace(DC)) {
- mangleUnscopedTemplateName(TD);
+ if (!ExcludeUnqualifiedName)
+ mangleUnscopedTemplateName(TD, AdditionalAbiTags);
mangleTemplateArgs(TemplateArgs, NumTemplateArgs);
} else {
- mangleNestedName(TD, TemplateArgs, NumTemplateArgs);
+ mangleNestedName(TD, AdditionalAbiTags, ExcludeUnqualifiedName, TemplateArgs, NumTemplateArgs);
}
}
-void CXXNameMangler::mangleUnscopedName(const NamedDecl *ND) {
+void CXXNameMangler::mangleUnscopedName(const NamedDecl *ND, const AbiTagList *AdditionalAbiTags) {
// <unscoped-name> ::= <unqualified-name>
// ::= St <unqualified-name> # ::std::
if (isStdNamespace(IgnoreLinkageSpecDecls(getEffectiveDeclContext(ND))))
Out << "St";
- mangleUnqualifiedName(ND);
+ mangleUnqualifiedName(ND, AdditionalAbiTags);
}
-void CXXNameMangler::mangleUnscopedTemplateName(const TemplateDecl *ND) {
+void CXXNameMangler::mangleUnscopedTemplateName(const TemplateDecl *ND,
+ const AbiTagList *AdditionalAbiTags) {
// <unscoped-template-name> ::= <unscoped-name>
// ::= <substitution>
if (mangleSubstitution(ND))
return;
// <template-template-param> ::= <template-param>
- if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(ND))
+ if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(ND)) {
+ assert(!AdditionalAbiTags && "template template param cannot have abi tags"); // TODO(abitags)
mangleTemplateParameter(TTP->getIndex());
- else
- mangleUnscopedName(ND->getTemplatedDecl());
+ } else {
+ mangleUnscopedName(ND->getTemplatedDecl(), AdditionalAbiTags);
+ }
addSubstitution(ND);
}
-void CXXNameMangler::mangleUnscopedTemplateName(TemplateName Template) {
+void CXXNameMangler::mangleUnscopedTemplateName(TemplateName Template,
+ const AbiTagList *AdditionalAbiTags) {
// <unscoped-template-name> ::= <unscoped-name>
// ::= <substitution>
if (TemplateDecl *TD = Template.getAsTemplateDecl())
- return mangleUnscopedTemplateName(TD);
+ return mangleUnscopedTemplateName(TD, AdditionalAbiTags);
if (mangleSubstitution(Template))
return;
+ assert(!AdditionalAbiTags && "dependent template name cannot have abi tags"); // TODO(abitags)
+
DependentTemplateName *Dependent = Template.getAsDependentTemplateName();
assert(Dependent && "Not a dependent template name?");
if (const IdentifierInfo *Id = Dependent->getIdentifier())
mangleSourceName(Id);
else
mangleOperatorName(Dependent->getOperator(), UnknownArity);
-
+
addSubstitution(Template);
}
@@ -836,6 +1073,7 @@ void CXXNameMangler::mangleUnresolvedPrefix(NestedNameSpecifier *qualifier,
else
Out << "sr";
mangleSourceName(qualifier->getAsNamespace()->getIdentifier());
+ writeAbiTags(qualifier->getAsNamespace());
break;
case NestedNameSpecifier::NamespaceAlias:
if (qualifier->getPrefix())
@@ -844,6 +1082,7 @@ void CXXNameMangler::mangleUnresolvedPrefix(NestedNameSpecifier *qualifier,
else
Out << "sr";
mangleSourceName(qualifier->getAsNamespaceAlias()->getIdentifier());
+ writeAbiTags(qualifier->getAsNamespaceAlias());
break;
case NestedNameSpecifier::TypeSpec:
@@ -878,6 +1117,7 @@ void CXXNameMangler::mangleUnresolvedPrefix(NestedNameSpecifier *qualifier,
Out << "sr";
mangleSourceName(qualifier->getAsIdentifier());
+ writeAbiTags(qualifier->getAsNamespaceAlias());
break;
}
@@ -923,7 +1163,8 @@ void CXXNameMangler::mangleUnresolvedName(NestedNameSpecifier *qualifier,
void CXXNameMangler::mangleUnqualifiedName(const NamedDecl *ND,
DeclarationName Name,
- unsigned KnownArity) {
+ unsigned KnownArity,
+ const AbiTagList *AdditionalAbiTags) {
unsigned Arity = KnownArity;
// <unqualified-name> ::= <operator-name>
// ::= <ctor-dtor-name>
@@ -942,6 +1183,7 @@ void CXXNameMangler::mangleUnqualifiedName(const NamedDecl *ND,
Out << 'L';
mangleSourceName(II);
+ writeAbiTags(ND, AdditionalAbiTags);
break;
}
@@ -981,6 +1223,7 @@ void CXXNameMangler::mangleUnqualifiedName(const NamedDecl *ND,
assert(FD->getIdentifier() && "Data member name isn't an identifier!");
mangleSourceName(FD->getIdentifier());
+ // TODO(abitags): not emitting abi tags: internal name anyway
break;
}
@@ -1001,6 +1244,9 @@ void CXXNameMangler::mangleUnqualifiedName(const NamedDecl *ND,
assert(D->getDeclName().getAsIdentifierInfo() &&
"Typedef was not named!");
mangleSourceName(D->getDeclName().getAsIdentifierInfo());
+ assert(!AdditionalAbiTags && "Type cannot have additional abi tags");
+ // explicit abi tags are still possible; take from underlying type, not from typedef.
+ writeAbiTags(TD, nullptr);
break;
}
@@ -1010,6 +1256,7 @@ void CXXNameMangler::mangleUnqualifiedName(const NamedDecl *ND,
// <lambda-sig> ::= <parameter-type>+ # Parameter types or 'v' for 'void'.
if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(TD)) {
if (Record->isLambda() && Record->getLambdaManglingNumber()) {
+ assert(!AdditionalAbiTags && "Lambda type cannot have additional abi tags");
mangleLambda(Record);
break;
}
@@ -1021,6 +1268,7 @@ void CXXNameMangler::mangleUnqualifiedName(const NamedDecl *ND,
if (UnnamedMangle > 1)
Out << llvm::utostr(UnnamedMangle - 2);
Out << '_';
+ writeAbiTags(TD, AdditionalAbiTags);
break;
}
@@ -1053,6 +1301,7 @@ void CXXNameMangler::mangleUnqualifiedName(const NamedDecl *ND,
// Otherwise, use the complete constructor name. This is relevant if a
// class with a constructor is declared within a constructor.
mangleCXXCtorType(Ctor_Complete);
+ writeAbiTags(ND, AdditionalAbiTags);
break;
case DeclarationName::CXXDestructorName:
@@ -1064,6 +1313,7 @@ void CXXNameMangler::mangleUnqualifiedName(const NamedDecl *ND,
// Otherwise, use the complete destructor name. This is relevant if a
// class with a destructor is declared within a destructor.
mangleCXXDtorType(Dtor_Complete);
+ writeAbiTags(ND, AdditionalAbiTags);
break;
case DeclarationName::CXXOperatorName:
@@ -1079,6 +1329,7 @@ void CXXNameMangler::mangleUnqualifiedName(const NamedDecl *ND,
case DeclarationName::CXXConversionFunctionName:
case DeclarationName::CXXLiteralOperatorName:
mangleOperatorName(Name, Arity);
+ writeAbiTags(ND, AdditionalAbiTags);
break;
case DeclarationName::CXXUsingDirective:
@@ -1095,7 +1346,9 @@ void CXXNameMangler::mangleSourceName(const IdentifierInfo *II) {
void CXXNameMangler::mangleNestedName(const NamedDecl *ND,
const DeclContext *DC,
- bool NoFunction) {
+ const AbiTagList *AdditionalAbiTags,
+ bool NoFunction,
+ bool ExcludeUnqualifiedName) {
// <nested-name>
// ::= N [<CV-qualifiers>] [<ref-qualifier>] <prefix> <unqualified-name> E
// ::= N [<CV-qualifiers>] [<ref-qualifier>] <template-prefix>
@@ -1115,30 +1368,35 @@ void CXXNameMangler::mangleNestedName(const NamedDecl *ND,
// Check if we have a template.
const TemplateArgumentList *TemplateArgs = nullptr;
if (const TemplateDecl *TD = isTemplate(ND, TemplateArgs)) {
- mangleTemplatePrefix(TD, NoFunction);
+ mangleTemplatePrefix(TD, AdditionalAbiTags, NoFunction, ExcludeUnqualifiedName);
mangleTemplateArgs(*TemplateArgs);
}
else {
manglePrefix(DC, NoFunction);
- mangleUnqualifiedName(ND);
+ if (!ExcludeUnqualifiedName)
+ mangleUnqualifiedName(ND, AdditionalAbiTags);
}
Out << 'E';
}
void CXXNameMangler::mangleNestedName(const TemplateDecl *TD,
+ const AbiTagList *AdditionalAbiTags,
+ bool ExcludeUnqualifiedName,
const TemplateArgument *TemplateArgs,
unsigned NumTemplateArgs) {
// <nested-name> ::= N [<CV-qualifiers>] <template-prefix> <template-args> E
Out << 'N';
- mangleTemplatePrefix(TD);
+ mangleTemplatePrefix(TD, AdditionalAbiTags, ExcludeUnqualifiedName);
mangleTemplateArgs(TemplateArgs, NumTemplateArgs);
Out << 'E';
}
-void CXXNameMangler::mangleLocalName(const Decl *D) {
+void CXXNameMangler::mangleLocalName(const Decl *D,
+ const AbiTagList *AdditionalAbiTags,
+ bool ExcludeUnqualifiedName) {
// <local-name> := Z <function encoding> E <entity name> [<discriminator>]
// := Z <function encoding> E s [<discriminator>]
// <local-name> := Z <function encoding> E d [ <parameter number> ]
@@ -1150,15 +1408,25 @@ void CXXNameMangler::mangleLocalName(const Decl *D) {
Out << 'Z';
- if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(DC))
- mangleObjCMethodName(MD);
- else if (const BlockDecl *BD = dyn_cast<BlockDecl>(DC))
- mangleBlockForPrefix(BD);
- else
- mangleFunctionEncoding(cast<FunctionDecl>(DC));
+ {
+ AbiTagState localAbiTags(AbiTags);
+
+ if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(DC))
+ mangleObjCMethodName(MD);
+ else if (const BlockDecl *BD = dyn_cast<BlockDecl>(DC))
+ mangleBlockForPrefix(BD);
+ else
+ mangleFunctionEncoding(cast<FunctionDecl>(DC));
+
+ // implicit abi tags (from namespace) are not available in the following
+ // entity; reset to actually emitted tags, which are available.
+ localAbiTags.UsedAbiTags = localAbiTags.EmittedAbiTags;
+ }
Out << 'E';
+ TemporaryDisableDerivedAbiTags TemporyDisable(DisableDerivedAbiTags, getStructor(dyn_cast<NamedDecl>(D)) != Structor);
+
if (RD) {
// The parameter number is omitted for the last parameter, 0 for the
// second-to-last parameter, 1 for the third-to-last parameter, etc. The
@@ -1183,13 +1451,17 @@ void CXXNameMangler::mangleLocalName(const Decl *D) {
// Mangle the name relative to the closest enclosing function.
// equality ok because RD derived from ND above
if (D == RD) {
- mangleUnqualifiedName(RD);
+ if (!ExcludeUnqualifiedName)
+ mangleUnqualifiedName(RD, AdditionalAbiTags);
} else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
manglePrefix(getEffectiveDeclContext(BD), true /*NoFunction*/);
- mangleUnqualifiedBlock(BD);
+ assert(!AdditionalAbiTags && "Block cannot have additional abi tags");
+ if (!ExcludeUnqualifiedName)
+ mangleUnqualifiedBlock(BD);
} else {
const NamedDecl *ND = cast<NamedDecl>(D);
- mangleNestedName(ND, getEffectiveDeclContext(ND), true /*NoFunction*/);
+ mangleNestedName(ND, getEffectiveDeclContext(ND),
+ AdditionalAbiTags, true /*NoFunction*/, ExcludeUnqualifiedName);
}
} else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
// Mangle a block in a default parameter; see above explanation for
@@ -1206,30 +1478,35 @@ void CXXNameMangler::mangleLocalName(const Decl *D) {
}
}
- mangleUnqualifiedBlock(BD);
+ assert(!AdditionalAbiTags && "Block cannot have additional abi tags");
+ if (!ExcludeUnqualifiedName)
+ mangleUnqualifiedBlock(BD);
} else {
- mangleUnqualifiedName(cast<NamedDecl>(D));
- }
-
- if (const NamedDecl *ND = dyn_cast<NamedDecl>(RD ? RD : D)) {
- unsigned disc;
- if (Context.getNextDiscriminator(ND, disc)) {
- if (disc < 10)
- Out << '_' << disc;
- else
- Out << "__" << disc << '_';
+ if (!ExcludeUnqualifiedName)
+ mangleUnqualifiedName(cast<NamedDecl>(D), AdditionalAbiTags);
+ }
+
+ if (!ExcludeUnqualifiedName) {
+ if (const NamedDecl *ND = dyn_cast<NamedDecl>(RD ? RD : D)) {
+ unsigned disc;
+ if (Context.getNextDiscriminator(ND, disc)) {
+ if (disc < 10)
+ Out << '_' << disc;
+ else
+ Out << "__" << disc << '_';
+ }
}
}
}
void CXXNameMangler::mangleBlockForPrefix(const BlockDecl *Block) {
if (GetLocalClassDecl(Block)) {
- mangleLocalName(Block);
+ mangleLocalName(Block, /* AdditionalAbiTags */ nullptr, /* ExcludeUnqualifiedName */ false);
return;
}
const DeclContext *DC = getEffectiveDeclContext(Block);
if (isLocalContainerContext(DC)) {
- mangleLocalName(Block);
+ mangleLocalName(Block, /* AdditionalAbiTags */ nullptr, /* ExcludeUnqualifiedName */ false);
return;
}
manglePrefix(getEffectiveDeclContext(Block));
@@ -1240,10 +1517,11 @@ void CXXNameMangler::mangleUnqualifiedBlock(const BlockDecl *Block) {
if (Decl *Context = Block->getBlockManglingContextDecl()) {
if ((isa<VarDecl>(Context) || isa<FieldDecl>(Context)) &&
Context->getDeclContext()->isRecord()) {
- if (const IdentifierInfo *Name
- = cast<NamedDecl>(Context)->getIdentifier()) {
+ const auto *ND = cast<NamedDecl>(Context);
+ if (const IdentifierInfo *Name = ND->getIdentifier()) {
mangleSourceName(Name);
- Out << 'M';
+ writeAbiTags(ND, /* AdditionalAbiTags */ nullptr);
+ Out << 'M';
}
}
}
@@ -1276,7 +1554,7 @@ void CXXNameMangler::mangleLambda(const CXXRecordDecl *Lambda) {
if (const IdentifierInfo *Name
= cast<NamedDecl>(Context)->getIdentifier()) {
mangleSourceName(Name);
- Out << 'M';
+ Out << 'M';
}
}
}
@@ -1358,11 +1636,11 @@ void CXXNameMangler::manglePrefix(const DeclContext *DC, bool NoFunction) {
// Check if we have a template.
const TemplateArgumentList *TemplateArgs = nullptr;
if (const TemplateDecl *TD = isTemplate(ND, TemplateArgs)) {
- mangleTemplatePrefix(TD);
+ mangleTemplatePrefix(TD, /* AdditionalAbiTags */ nullptr);
mangleTemplateArgs(*TemplateArgs);
} else {
manglePrefix(getEffectiveDeclContext(ND), NoFunction);
- mangleUnqualifiedName(ND);
+ mangleUnqualifiedName(ND, /* AdditionalAbiTags */ nullptr);
}
addSubstitution(ND);
@@ -1373,27 +1651,30 @@ void CXXNameMangler::mangleTemplatePrefix(TemplateName Template) {
// ::= <template-param>
// ::= <substitution>
if (TemplateDecl *TD = Template.getAsTemplateDecl())
- return mangleTemplatePrefix(TD);
+ return mangleTemplatePrefix(TD, /* AdditionalAbiTags */ nullptr);
if (QualifiedTemplateName *Qualified = Template.getAsQualifiedTemplateName())
manglePrefix(Qualified->getQualifier());
-
+
if (OverloadedTemplateStorage *Overloaded
= Template.getAsOverloadedTemplate()) {
mangleUnqualifiedName(nullptr, (*Overloaded->begin())->getDeclName(),
- UnknownArity);
+ UnknownArity,
+ /* AdditionalAbiTags */ nullptr);
return;
}
-
+
DependentTemplateName *Dependent = Template.getAsDependentTemplateName();
assert(Dependent && "Unknown template name kind?");
if (NestedNameSpecifier *Qualifier = Dependent->getQualifier())
manglePrefix(Qualifier);
- mangleUnscopedTemplateName(Template);
+ mangleUnscopedTemplateName(Template, /* AdditionalAbiTags */ nullptr);
}
void CXXNameMangler::mangleTemplatePrefix(const TemplateDecl *ND,
- bool NoFunction) {
+ const AbiTagList *AdditionalAbiTags,
+ bool NoFunction,
+ bool ExcludeUnqualifiedName) {
// <template-prefix> ::= <prefix> <template unqualified-name>
// ::= <template-param>
// ::= <substitution>
@@ -1405,10 +1686,12 @@ void CXXNameMangler::mangleTemplatePrefix(const TemplateDecl *ND,
// <template-template-param> ::= <template-param>
if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(ND)) {
+ // TODO(abitags): ???
mangleTemplateParameter(TTP->getIndex());
} else {
manglePrefix(getEffectiveDeclContext(ND), NoFunction);
- mangleUnqualifiedName(ND->getTemplatedDecl());
+ if (!ExcludeUnqualifiedName)
+ mangleUnqualifiedName(ND->getTemplatedDecl(), AdditionalAbiTags);
}
addSubstitution(ND);
@@ -1452,6 +1735,7 @@ void CXXNameMangler::mangleType(TemplateName TN) {
// <name> ::= <nested-name>
mangleUnresolvedPrefix(Dependent->getQualifier());
mangleSourceName(Dependent->getIdentifier());
+ // writeAbiTags(Dependent);
break;
}
@@ -1543,16 +1827,19 @@ bool CXXNameMangler::mangleUnresolvedTypeOrSimpleId(QualType Ty,
case Type::Typedef:
mangleSourceName(cast<TypedefType>(Ty)->getDecl()->getIdentifier());
+ writeAbiTags(cast<TypedefType>(Ty)->getDecl());
break;
case Type::UnresolvedUsing:
mangleSourceName(
cast<UnresolvedUsingType>(Ty)->getDecl()->getIdentifier());
+ writeAbiTags(cast<UnresolvedUsingType>(Ty)->getDecl());
break;
case Type::Enum:
case Type::Record:
mangleSourceName(cast<TagType>(Ty)->getDecl()->getIdentifier());
+ writeAbiTags(cast<TagType>(Ty)->getDecl());
break;
case Type::TemplateSpecialization: {
@@ -1571,6 +1858,7 @@ bool CXXNameMangler::mangleUnresolvedTypeOrSimpleId(QualType Ty,
goto unresolvedType;
mangleSourceName(TD->getIdentifier());
+ writeAbiTags(TD);
break;
}
@@ -1602,16 +1890,19 @@ bool CXXNameMangler::mangleUnresolvedTypeOrSimpleId(QualType Ty,
case Type::InjectedClassName:
mangleSourceName(
cast<InjectedClassNameType>(Ty)->getDecl()->getIdentifier());
+ writeAbiTags(cast<InjectedClassNameType>(Ty)->getDecl());
break;
case Type::DependentName:
mangleSourceName(cast<DependentNameType>(Ty)->getIdentifier());
+ // writeAbiTags(cast<DependentNameType>(Ty));
break;
case Type::DependentTemplateSpecialization: {
const DependentTemplateSpecializationType *DTST =
cast<DependentTemplateSpecializationType>(Ty);
mangleSourceName(DTST->getIdentifier());
+ // writeAbiTags(DTST);
mangleTemplateArgs(DTST->getArgs(), DTST->getNumArgs());
break;
}
@@ -2433,7 +2724,11 @@ void CXXNameMangler::mangleType(const InjectedClassNameType *T) {
void CXXNameMangler::mangleType(const TemplateSpecializationType *T) {
if (TemplateDecl *TD = T->getTemplateName().getAsTemplateDecl()) {
- mangleName(TD, T->getArgs(), T->getNumArgs());
+ // types only have explicit abi tags, no addition tags
+ mangleTemplateName(TD,
+ /* AdditionalAbiTags */ nullptr,
+ /* ExcludeUnqualifiedName */ false,
+ T->getArgs(), T->getNumArgs());
} else {
if (mangleSubstitution(QualType(T, 0)))
return;
@@ -2480,6 +2775,7 @@ void CXXNameMangler::mangleType(const DependentNameType *T) {
Out << 'N';
manglePrefix(T->getQualifier());
mangleSourceName(T->getIdentifier());
+ // writeAbiTags(T); // TODO(abitags)
Out << 'E';
}
@@ -3876,6 +4172,74 @@ void CXXNameMangler::addSubstitution(uintptr_t Ptr) {
Substitutions[Ptr] = SeqID++;
}
+std::set<StringRef> CXXNameMangler::getTagsFromPrefixAndTemplateArguments(const NamedDecl *ND) {
+ llvm::raw_null_ostream NullOutStream;
+ CXXNameMangler TrackPrefixAndTemplateArguments(*this, NullOutStream);
+
+ if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
+ TrackPrefixAndTemplateArguments.mangleFunctionEncoding(FD, /* ExcludeUnqualifiedName */ true);
+ } else {
+ TrackPrefixAndTemplateArguments.mangleName(ND, /* ExcludeUnqualifiedName */ true);
+ }
+
+ return std::move(TrackPrefixAndTemplateArguments.AbiTagsRoot.UsedAbiTags);
+}
+
+CXXNameMangler::AbiTagList CXXNameMangler::makeAdditionalTagsForFunction(const FunctionDecl *FD) {
+ // when derived abi tags are disabled there is no need to make any list
+ if (DisableDerivedAbiTags) return AbiTagList();
+
+ std::set<StringRef> ImplicitlyAvailableTags = getTagsFromPrefixAndTemplateArguments(FD);
+ std::set<StringRef> ReturnTypeTags;
+
+ {
+ llvm::raw_null_ostream NullOutStream;
+ CXXNameMangler TrackReturnTypeTags(*this, NullOutStream);
+
+ const FunctionProtoType *Proto = cast<FunctionProtoType>(FD->getType()->getAs<FunctionType>());
+ TrackReturnTypeTags.FunctionTypeDepth.enterResultType();
+ TrackReturnTypeTags.mangleType(Proto->getReturnType());
+ TrackReturnTypeTags.FunctionTypeDepth.leaveResultType();
+
+ ReturnTypeTags = std::move(TrackReturnTypeTags.AbiTagsRoot.UsedAbiTags);
+ }
+
+ AbiTagList AdditionalAbiTags;
+
+ for (const auto& Tag: ReturnTypeTags) {
+ if (ImplicitlyAvailableTags.count(Tag) == 0)
+ AdditionalAbiTags.push_back(Tag);
+ }
+
+ return AdditionalAbiTags;
+}
+
+CXXNameMangler::AbiTagList CXXNameMangler::makeAdditionalTagsForVariable(const VarDecl *VD) {
+ // when derived abi tags are disabled there is no need to make any list
+ if (DisableDerivedAbiTags) return AbiTagList();
+
+ std::set<StringRef> ImplicitlyAvailableTags = getTagsFromPrefixAndTemplateArguments(VD);
+ std::set<StringRef> VariableTypeTags;
+
+ {
+ llvm::raw_null_ostream NullOutStream;
+ CXXNameMangler TrackVariableType(*this, NullOutStream);
+
+ TrackVariableType.mangleType(VD->getType());
+
+ VariableTypeTags = std::move(TrackVariableType.AbiTagsRoot.UsedAbiTags);
+ }
+
+ AbiTagList AdditionalAbiTags;
+
+ for (const auto& Tag: VariableTypeTags) {
+ if (ImplicitlyAvailableTags.count(Tag) == 0)
+ AdditionalAbiTags.push_back(Tag);
+ }
+
+ return AdditionalAbiTags;
+}
+
//
/// Mangles the name of the declaration D and emits that name to the given
@@ -3977,6 +4341,7 @@ void ItaniumMangleContextImpl::mangleStaticGuardVariable(const VarDecl *D,
// <special-name> ::= GV <object name> # Guard variable for one-time
// # initialization
CXXNameMangler Mangler(*this, Out);
+ Mangler.disableDerivedAbiTags(); // GCC: doesn't emit derived abi tags for guard variables
Mangler.getStream() << "_ZGV";
Mangler.mangleName(D);
}
diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp
index 31ed9f2..ac85f30 100644
--- a/lib/Sema/SemaDeclAttr.cpp
+++ b/lib/Sema/SemaDeclAttr.cpp
@@ -4167,6 +4167,58 @@ static void handleDeclspecThreadAttr(Sema &S, Decl *D,
Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
}
+static void handleAbiTagAttr(Sema &S, Decl *D,
+ const AttributeList &Attr) {
+ if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
+ return;
+
+ SmallVector<std::string, 4> Tags;
+
+ for (unsigned I = 0, E = Attr.getNumArgs(); I != E; ++I) {
+ StringRef Tag;
+
+ if (!S.checkStringLiteralArgumentAttr(Attr, I, Tag))
+ return;
+
+ Tags.push_back(Tag);
+ }
+ // store tags sorted and without duplicates
+ std::sort(Tags.begin(), Tags.end());
+ Tags.erase(std::unique(Tags.begin(), Tags.end()), Tags.end());
+
+ if (const auto *NS = dyn_cast<NamespaceDecl>(D)) {
+ if (!NS->isInline()) {
+ S.Diag(Attr.getLoc(), diag::err_attr_abi_tag_only_on_inline_namespace);
+ return;
+ }
+ }
+
+ const auto *CD = D->getCanonicalDecl();
+ if (CD != D) {
+ // redeclarations must not add new abi tags, or abi tags in the first place
+ const auto *OldAbiTagAttr = D->getAttr<AbiTagAttr>();
+ if (nullptr == OldAbiTagAttr) {
+ S.Diag(Attr.getLoc(), diag::err_abi_tag_on_redeclaration);
+ S.Diag(CD->getLocation(), diag::note_previous_definition);
+ return;
+ }
+ for (const auto& NewTag: Tags) {
+ if (std::find(OldAbiTagAttr->tags_begin(),
+ OldAbiTagAttr->tags_end(),
+ NewTag) == OldAbiTagAttr->tags_end()) {
+ S.Diag(Attr.getLoc(), diag::err_new_abi_tag_on_redeclaration) << NewTag;
+ S.Diag(OldAbiTagAttr->getLocation(), diag::note_previous_definition);
+ return;
+ }
+ }
+ return;
+ }
+
+ D->addAttr(::new (S.Context) AbiTagAttr(Attr.getRange(), S.Context,
+ Tags.data(), Tags.size(),
+ Attr.getAttributeSpellingListIndex()));
+}
+
static void handleARMInterruptAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
// Check the attribute arguments.
@@ -4982,6 +5034,9 @@ static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
case AttributeList::AT_Thread:
handleDeclspecThreadAttr(S, D, Attr);
break;
+ case AttributeList::AT_AbiTag:
+ handleAbiTagAttr(S, D, Attr);
+ break;
// Thread safety attributes:
case AttributeList::AT_AssertExclusiveLock:
======== Abi Tags ======== Introduction ============ This text tries to describe gcc semantic for mangling "abi_tag" attributes described in https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html There is no guarantee the following rules are correct, complete or make sense in any way as they were determined empirically by experiments with gcc5. Declaration =========== Abi tags are declared in an abi_tag attribute and can be applied to a function, variable, class or inline namespace declaration. The attribute takes one or more strings (called tags); the order does not matter. See https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html for details. Tags on an inline namespace are called "implicit tags", all other tags are "explicit tags". Mangling ======== All tags that are "active" on a <unqualified-name> are emitted after the <unqualified-name>, before <template-args> or <discriminator>, and are part of the same <substitution> the <unqualified-name> is. They are mangled as: <abi-tags> ::= <abi-tag>* # sort by name <abi-tag> ::= B <tag source-name> Example: __attribute__((abi_tag("test"))) void Func(); gets mangled as: _Z4FuncB4testv (prettified as `Func[abi:test]()`) Active tags =========== A namespace has never any active tags; for types (class / struct / union / enum) the explicit tags are the active tags. For variables and functions the active tags are the explicit tags plus any "required tags" which are not in the "available tags" set: derived-tags := (required-tags - available-tags) active-tags := explicit-tags + derived-tags Required tags for a function ============================ If a function is used as a local scope for another name, and is part of another function as local scope, it doesn't have any required tags. If a function is used as a local scope for a guard variable name, it doesn't have any required tags. Otherwise the function requires any implicit or explicit tag used in the name for the return type. Required tags for a variable ============================ A variable requires any implicit or explicit tag used in its type. Available tags ============== All tags used in the prefix and in the template arguments for a name are available; for functions also all tags from the <bare-function-type> (which might include the return type for template functions) are available. For <local-name>s all active tags used in the local part (<function- encoding>) are available, but not implicit tags which were not active! Implicit and explicit tags used in the <unqualified-name> for a function (as in the type of a cast operator) are NOT available. Example: a cast operator to std::string (which is std::__cxx11::basic_string<...>) will use 'cxx11' as active tag, as it is required from the return type `std::string` but not available.
test-itanium-mangle.sh
Description: application/shellscript
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