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//===--- StandardLibrary.cpp ------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "clang/Tooling/Inclusions/StandardLibrary.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Casting.h"
namespace clang {
namespace tooling {
namespace stdlib {
static llvm::StringRef *HeaderNames;
static std::pair<llvm::StringRef, llvm::StringRef> *SymbolNames;
static unsigned *SymbolHeaderIDs;
static llvm::DenseMap<llvm::StringRef, unsigned> *HeaderIDs;
// Maps symbol name -> Symbol::ID, within a namespace.
using NSSymbolMap = llvm::DenseMap<llvm::StringRef, unsigned>;
static llvm::DenseMap<llvm::StringRef, NSSymbolMap *> *NamespaceSymbols;
static int initialize() {
unsigned SymCount = 0;
#define SYMBOL(Name, NS, Header) ++SymCount;
#include "clang/Tooling/Inclusions/CSymbolMap.inc"
#include "clang/Tooling/Inclusions/StdSymbolMap.inc"
#undef SYMBOL
SymbolNames = new std::remove_reference_t<decltype(*SymbolNames)>[SymCount];
SymbolHeaderIDs =
new std::remove_reference_t<decltype(*SymbolHeaderIDs)>[SymCount];
NamespaceSymbols = new std::remove_reference_t<decltype(*NamespaceSymbols)>;
HeaderIDs = new std::remove_reference_t<decltype(*HeaderIDs)>;
auto AddNS = [&](llvm::StringRef NS) -> NSSymbolMap & {
auto R = NamespaceSymbols->try_emplace(NS, nullptr);
if (R.second)
R.first->second = new NSSymbolMap();
return *R.first->second;
};
auto AddHeader = [&](llvm::StringRef Header) -> unsigned {
return HeaderIDs->try_emplace(Header, HeaderIDs->size()).first->second;
};
auto Add = [&, SymIndex(0)](llvm::StringRef Name, llvm::StringRef NS,
llvm::StringRef HeaderName) mutable {
if (NS == "None")
NS = "";
SymbolNames[SymIndex] = {NS, Name};
SymbolHeaderIDs[SymIndex] = AddHeader(HeaderName);
NSSymbolMap &NSSymbols = AddNS(NS);
NSSymbols.try_emplace(Name, SymIndex);
++SymIndex;
};
#define SYMBOL(Name, NS, Header) Add(#Name, #NS, #Header);
#include "clang/Tooling/Inclusions/CSymbolMap.inc"
#include "clang/Tooling/Inclusions/StdSymbolMap.inc"
#undef SYMBOL
HeaderNames = new llvm::StringRef[HeaderIDs->size()];
for (const auto &E : *HeaderIDs)
HeaderNames[E.second] = E.first;
return 0;
}
static void ensureInitialized() {
static int Dummy = initialize();
(void)Dummy;
}
llvm::Optional<Header> Header::named(llvm::StringRef Name) {
ensureInitialized();
auto It = HeaderIDs->find(Name);
if (It == HeaderIDs->end())
return llvm::None;
return Header(It->second);
}
llvm::StringRef Header::name() const { return HeaderNames[ID]; }
llvm::StringRef Symbol::scope() const { return SymbolNames[ID].first; }
llvm::StringRef Symbol::name() const { return SymbolNames[ID].second; }
llvm::Optional<Symbol> Symbol::named(llvm::StringRef Scope,
llvm::StringRef Name) {
ensureInitialized();
if (NSSymbolMap *NSSymbols = NamespaceSymbols->lookup(Scope)) {
auto It = NSSymbols->find(Name);
if (It != NSSymbols->end())
return Symbol(It->second);
}
return llvm::None;
}
Header Symbol::header() const { return Header(SymbolHeaderIDs[ID]); }
llvm::SmallVector<Header> Symbol::headers() const {
return {header()}; // FIXME: multiple in case of ambiguity
}
Recognizer::Recognizer() { ensureInitialized(); }
NSSymbolMap *Recognizer::namespaceSymbols(const NamespaceDecl *D) {
auto It = NamespaceCache.find(D);
if (It != NamespaceCache.end())
return It->second;
NSSymbolMap *Result = [&]() -> NSSymbolMap * {
if (D && D->isAnonymousNamespace())
return nullptr;
// Print the namespace and its parents ommitting inline scopes.
std::string Scope;
for (const auto *ND = D; ND;
ND = llvm::dyn_cast_or_null<NamespaceDecl>(ND->getParent()))
if (!ND->isInlineNamespace() && !ND->isAnonymousNamespace())
Scope = ND->getName().str() + "::" + Scope;
return NamespaceSymbols->lookup(Scope);
}();
NamespaceCache.try_emplace(D, Result);
return Result;
}
llvm::Optional<Symbol> Recognizer::operator()(const Decl *D) {
// If D is std::vector::iterator, `vector` is the outer symbol to look up.
// We keep all the candidate DCs as some may turn out to be anon enums.
// Do this resolution lazily as we may turn out not to have a std namespace.
llvm::SmallVector<const DeclContext *> IntermediateDecl;
const DeclContext *DC = D->getDeclContext();
while (DC && !DC->isNamespace()) {
if (NamedDecl::classofKind(DC->getDeclKind()))
IntermediateDecl.push_back(DC);
DC = DC->getParent();
}
NSSymbolMap *Symbols = namespaceSymbols(cast_or_null<NamespaceDecl>(DC));
if (!Symbols)
return llvm::None;
llvm::StringRef Name = [&]() -> llvm::StringRef {
for (const auto *SymDC : llvm::reverse(IntermediateDecl)) {
DeclarationName N = cast<NamedDecl>(SymDC)->getDeclName();
if (const auto *II = N.getAsIdentifierInfo())
return II->getName();
if (!N.isEmpty())
return ""; // e.g. operator<: give up
}
if (const auto *ND = llvm::dyn_cast<NamedDecl>(D))
if (const auto *II = ND->getIdentifier())
return II->getName();
return "";
}();
if (Name.empty())
return llvm::None;
auto It = Symbols->find(Name);
if (It == Symbols->end())
return llvm::None;
return Symbol(It->second);
}
} // namespace stdlib
} // namespace tooling
} // namespace clang
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