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//===-- Mapper.cpp - ClangDoc Mapper ----------------------------*- 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 "Mapper.h"
#include "BitcodeWriter.h"
#include "Serialize.h"
#include "clang/AST/Comment.h"
#include "clang/Index/USRGeneration.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Support/Mutex.h"
namespace clang {
namespace doc {
static llvm::StringSet<> USRVisited;
static llvm::sys::Mutex USRVisitedGuard;
template <typename T> bool isTypedefAnonRecord(const T *D) {
if (const auto *C = dyn_cast<CXXRecordDecl>(D)) {
return C->getTypedefNameForAnonDecl();
}
return false;
}
void MapASTVisitor::HandleTranslationUnit(ASTContext &Context) {
TraverseDecl(Context.getTranslationUnitDecl());
}
template <typename T>
bool MapASTVisitor::mapDecl(const T *D, bool IsDefinition) {
// If we're looking a decl not in user files, skip this decl.
if (D->getASTContext().getSourceManager().isInSystemHeader(D->getLocation()))
return true;
// Skip function-internal decls.
if (D->getParentFunctionOrMethod())
return true;
llvm::SmallString<128> USR;
// If there is an error generating a USR for the decl, skip this decl.
if (index::generateUSRForDecl(D, USR))
return true;
// Prevent Visiting USR twice
{
std::lock_guard<llvm::sys::Mutex> Guard(USRVisitedGuard);
StringRef Visited = USR.str();
if (USRVisited.count(Visited) && !isTypedefAnonRecord<T>(D))
return true;
// We considered a USR to be visited only when its defined
if (IsDefinition)
USRVisited.insert(Visited);
}
bool IsFileInRootDir;
llvm::SmallString<128> File =
getFile(D, D->getASTContext(), CDCtx.SourceRoot, IsFileInRootDir);
auto I = serialize::emitInfo(D, getComment(D, D->getASTContext()),
getLine(D, D->getASTContext()), File,
IsFileInRootDir, CDCtx.PublicOnly);
// A null in place of I indicates that the serializer is skipping this decl
// for some reason (e.g. we're only reporting public decls).
if (I.first)
CDCtx.ECtx->reportResult(llvm::toHex(llvm::toStringRef(I.first->USR)),
serialize::serialize(I.first));
if (I.second)
CDCtx.ECtx->reportResult(llvm::toHex(llvm::toStringRef(I.second->USR)),
serialize::serialize(I.second));
return true;
}
bool MapASTVisitor::VisitNamespaceDecl(const NamespaceDecl *D) {
return mapDecl(D, /*isDefinition=*/true);
}
bool MapASTVisitor::VisitRecordDecl(const RecordDecl *D) {
return mapDecl(D, D->isThisDeclarationADefinition());
}
bool MapASTVisitor::VisitEnumDecl(const EnumDecl *D) {
return mapDecl(D, D->isThisDeclarationADefinition());
}
bool MapASTVisitor::VisitCXXMethodDecl(const CXXMethodDecl *D) {
return mapDecl(D, D->isThisDeclarationADefinition());
}
bool MapASTVisitor::VisitFunctionDecl(const FunctionDecl *D) {
// Don't visit CXXMethodDecls twice
if (isa<CXXMethodDecl>(D))
return true;
return mapDecl(D, D->isThisDeclarationADefinition());
}
bool MapASTVisitor::VisitTypedefDecl(const TypedefDecl *D) {
return mapDecl(D, /*isDefinition=*/true);
}
bool MapASTVisitor::VisitTypeAliasDecl(const TypeAliasDecl *D) {
return mapDecl(D, /*isDefinition=*/true);
}
comments::FullComment *
MapASTVisitor::getComment(const NamedDecl *D, const ASTContext &Context) const {
RawComment *Comment = Context.getRawCommentForDeclNoCache(D);
// FIXME: Move setAttached to the initial comment parsing.
if (Comment) {
Comment->setAttached();
return Comment->parse(Context, nullptr, D);
}
return nullptr;
}
int MapASTVisitor::getLine(const NamedDecl *D,
const ASTContext &Context) const {
return Context.getSourceManager().getPresumedLoc(D->getBeginLoc()).getLine();
}
llvm::SmallString<128> MapASTVisitor::getFile(const NamedDecl *D,
const ASTContext &Context,
llvm::StringRef RootDir,
bool &IsFileInRootDir) const {
llvm::SmallString<128> File(Context.getSourceManager()
.getPresumedLoc(D->getBeginLoc())
.getFilename());
IsFileInRootDir = false;
if (RootDir.empty() || !File.starts_with(RootDir))
return File;
IsFileInRootDir = true;
llvm::SmallString<128> Prefix(RootDir);
// replace_path_prefix removes the exact prefix provided. The result of
// calling that function on ("A/B/C.c", "A/B", "") would be "/C.c", which
// starts with a / that is not needed. This is why we fix Prefix so it always
// ends with a / and the result has the desired format.
if (!llvm::sys::path::is_separator(Prefix.back()))
Prefix += llvm::sys::path::get_separator();
llvm::sys::path::replace_path_prefix(File, Prefix, "");
return File;
}
} // namespace doc
} // namespace clang
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