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//===--- Attributes.cpp ---------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the AttributeCommonInfo interface.
//
//===----------------------------------------------------------------------===//
#include "clang/Basic/Attributes.h"
#include "clang/Basic/AttrSubjectMatchRules.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/ParsedAttrInfo.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringSwitch.h"
using namespace clang;
static int hasAttributeImpl(AttributeCommonInfo::Syntax Syntax, StringRef Name,
StringRef ScopeName, const TargetInfo &Target,
const LangOptions &LangOpts) {
#include "clang/Basic/AttrHasAttributeImpl.inc"
return 0;
}
int clang::hasAttribute(AttributeCommonInfo::Syntax Syntax,
const IdentifierInfo *Scope, const IdentifierInfo *Attr,
const TargetInfo &Target, const LangOptions &LangOpts,
bool CheckPlugins) {
StringRef Name = Attr->getName();
// Normalize the attribute name, __foo__ becomes foo.
if (Name.size() >= 4 && Name.starts_with("__") && Name.ends_with("__"))
Name = Name.substr(2, Name.size() - 4);
// Normalize the scope name, but only for gnu and clang attributes.
StringRef ScopeName = Scope ? Scope->getName() : "";
if (ScopeName == "__gnu__")
ScopeName = "gnu";
else if (ScopeName == "_Clang")
ScopeName = "clang";
// As a special case, look for the omp::sequence and omp::directive
// attributes. We support those, but not through the typical attribute
// machinery that goes through TableGen. We support this in all OpenMP modes
// so long as double square brackets are enabled.
//
// Other OpenMP attributes (e.g. [[omp::assume]]) are handled via the
// regular attribute parsing machinery.
if (LangOpts.OpenMP && ScopeName == "omp" &&
(Name == "directive" || Name == "sequence"))
return 1;
int res = hasAttributeImpl(Syntax, Name, ScopeName, Target, LangOpts);
if (res)
return res;
if (CheckPlugins) {
// Check if any plugin provides this attribute.
for (auto &Ptr : getAttributePluginInstances())
if (Ptr->hasSpelling(Syntax, Name))
return 1;
}
return 0;
}
int clang::hasAttribute(AttributeCommonInfo::Syntax Syntax,
const IdentifierInfo *Scope, const IdentifierInfo *Attr,
const TargetInfo &Target, const LangOptions &LangOpts) {
return hasAttribute(Syntax, Scope, Attr, Target, LangOpts,
/*CheckPlugins=*/true);
}
const char *attr::getSubjectMatchRuleSpelling(attr::SubjectMatchRule Rule) {
switch (Rule) {
#define ATTR_MATCH_RULE(NAME, SPELLING, IsAbstract) \
case attr::NAME: \
return SPELLING;
#include "clang/Basic/AttrSubMatchRulesList.inc"
}
llvm_unreachable("Invalid subject match rule");
}
static StringRef
normalizeAttrScopeName(const IdentifierInfo *Scope,
AttributeCommonInfo::Syntax SyntaxUsed) {
if (!Scope)
return "";
// Normalize the "__gnu__" scope name to be "gnu" and the "_Clang" scope name
// to be "clang".
StringRef ScopeName = Scope->getName();
if (SyntaxUsed == AttributeCommonInfo::AS_CXX11 ||
SyntaxUsed == AttributeCommonInfo::AS_C23) {
if (ScopeName == "__gnu__")
ScopeName = "gnu";
else if (ScopeName == "_Clang")
ScopeName = "clang";
}
return ScopeName;
}
static StringRef normalizeAttrName(const IdentifierInfo *Name,
StringRef NormalizedScopeName,
AttributeCommonInfo::Syntax SyntaxUsed) {
// Normalize the attribute name, __foo__ becomes foo. This is only allowable
// for GNU attributes, and attributes using the double square bracket syntax.
bool ShouldNormalize =
SyntaxUsed == AttributeCommonInfo::AS_GNU ||
((SyntaxUsed == AttributeCommonInfo::AS_CXX11 ||
SyntaxUsed == AttributeCommonInfo::AS_C23) &&
(NormalizedScopeName.empty() || NormalizedScopeName == "gnu" ||
NormalizedScopeName == "clang"));
StringRef AttrName = Name->getName();
if (ShouldNormalize && AttrName.size() >= 4 && AttrName.starts_with("__") &&
AttrName.ends_with("__"))
AttrName = AttrName.slice(2, AttrName.size() - 2);
return AttrName;
}
bool AttributeCommonInfo::isGNUScope() const {
return ScopeName && (ScopeName->isStr("gnu") || ScopeName->isStr("__gnu__"));
}
bool AttributeCommonInfo::isClangScope() const {
return ScopeName && (ScopeName->isStr("clang") || ScopeName->isStr("_Clang"));
}
#include "clang/Sema/AttrParsedAttrKinds.inc"
static SmallString<64> normalizeName(const IdentifierInfo *Name,
const IdentifierInfo *Scope,
AttributeCommonInfo::Syntax SyntaxUsed) {
StringRef ScopeName = normalizeAttrScopeName(Scope, SyntaxUsed);
StringRef AttrName = normalizeAttrName(Name, ScopeName, SyntaxUsed);
SmallString<64> FullName = ScopeName;
if (!ScopeName.empty()) {
assert(SyntaxUsed == AttributeCommonInfo::AS_CXX11 ||
SyntaxUsed == AttributeCommonInfo::AS_C23);
FullName += "::";
}
FullName += AttrName;
return FullName;
}
AttributeCommonInfo::Kind
AttributeCommonInfo::getParsedKind(const IdentifierInfo *Name,
const IdentifierInfo *ScopeName,
Syntax SyntaxUsed) {
return ::getAttrKind(normalizeName(Name, ScopeName, SyntaxUsed), SyntaxUsed);
}
AttributeCommonInfo::AttrArgsInfo
AttributeCommonInfo::getCXX11AttrArgsInfo(const IdentifierInfo *Name) {
StringRef AttrName =
normalizeAttrName(Name, /*NormalizedScopeName*/ "", Syntax::AS_CXX11);
#define CXX11_ATTR_ARGS_INFO
return llvm::StringSwitch<AttributeCommonInfo::AttrArgsInfo>(AttrName)
#include "clang/Basic/CXX11AttributeInfo.inc"
.Default(AttributeCommonInfo::AttrArgsInfo::None);
#undef CXX11_ATTR_ARGS_INFO
}
std::string AttributeCommonInfo::getNormalizedFullName() const {
return static_cast<std::string>(
normalizeName(getAttrName(), getScopeName(), getSyntax()));
}
static AttributeCommonInfo::Scope
getScopeFromNormalizedScopeName(StringRef ScopeName) {
return llvm::StringSwitch<AttributeCommonInfo::Scope>(ScopeName)
.Case("", AttributeCommonInfo::Scope::NONE)
.Case("clang", AttributeCommonInfo::Scope::CLANG)
.Case("gnu", AttributeCommonInfo::Scope::GNU)
.Case("gsl", AttributeCommonInfo::Scope::GSL)
.Case("hlsl", AttributeCommonInfo::Scope::HLSL)
.Case("msvc", AttributeCommonInfo::Scope::MSVC)
.Case("omp", AttributeCommonInfo::Scope::OMP)
.Case("riscv", AttributeCommonInfo::Scope::RISCV);
}
unsigned AttributeCommonInfo::calculateAttributeSpellingListIndex() const {
// Both variables will be used in tablegen generated
// attribute spell list index matching code.
auto Syntax = static_cast<AttributeCommonInfo::Syntax>(getSyntax());
StringRef ScopeName = normalizeAttrScopeName(getScopeName(), Syntax);
StringRef Name = normalizeAttrName(getAttrName(), ScopeName, Syntax);
AttributeCommonInfo::Scope ComputedScope =
getScopeFromNormalizedScopeName(ScopeName);
#include "clang/Sema/AttrSpellingListIndex.inc"
}
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