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//===-- ClangHost.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
//
//===----------------------------------------------------------------------===//
#include "ClangHost.h"
#include "clang/Basic/Version.h"
#include "clang/Config/config.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Threading.h"
#include "lldb/Host/Config.h"
#include "lldb/Host/FileSystem.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Utility/FileSpec.h"
#include "lldb/Utility/Log.h"
#include <string>
using namespace lldb_private;
static bool VerifyClangPath(const llvm::Twine &clang_path) {
if (FileSystem::Instance().IsDirectory(clang_path))
return true;
Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
LLDB_LOGF(log,
"VerifyClangPath(): "
"failed to stat clang resource directory at \"%s\"",
clang_path.str().c_str());
return false;
}
///
/// This will compute the clang resource directory assuming that clang was
/// installed with the same prefix as lldb.
///
/// If verify is true, the first candidate resource directory will be returned.
/// This mode is only used for testing.
///
static bool DefaultComputeClangResourceDirectory(FileSpec &lldb_shlib_spec,
FileSpec &file_spec,
bool verify) {
Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
std::string raw_path = lldb_shlib_spec.GetPath();
llvm::StringRef parent_dir = llvm::sys::path::parent_path(raw_path);
static const llvm::StringRef kResourceDirSuffixes[] = {
// LLVM.org's build of LLDB uses the clang resource directory placed
// in $install_dir/lib{,64}/clang/$clang_version.
"lib" CLANG_LIBDIR_SUFFIX "/clang/" CLANG_VERSION_STRING,
// swift-lldb uses the clang resource directory copied from swift, which
// by default is placed in $install_dir/lib{,64}/lldb/clang. LLDB places
// it there, so we use LLDB_LIBDIR_SUFFIX.
"lib" LLDB_LIBDIR_SUFFIX "/lldb/clang",
};
for (const auto &Suffix : kResourceDirSuffixes) {
llvm::SmallString<256> clang_dir(parent_dir);
llvm::SmallString<32> relative_path(Suffix);
llvm::sys::path::native(relative_path);
llvm::sys::path::append(clang_dir, relative_path);
if (!verify || VerifyClangPath(clang_dir)) {
LLDB_LOG(log,
"DefaultComputeClangResourceDir: Setting ClangResourceDir "
"to \"{0}\", verify = {1}",
clang_dir.str(), verify ? "true" : "false");
file_spec.GetDirectory().SetString(clang_dir);
FileSystem::Instance().Resolve(file_spec);
return true;
}
}
return false;
}
bool lldb_private::ComputeClangResourceDirectory(FileSpec &lldb_shlib_spec,
FileSpec &file_spec, bool verify) {
#if !defined(__APPLE__)
return DefaultComputeClangResourceDirectory(lldb_shlib_spec, file_spec,
verify);
#else
std::string raw_path = lldb_shlib_spec.GetPath();
auto rev_it = llvm::sys::path::rbegin(raw_path);
auto r_end = llvm::sys::path::rend(raw_path);
// Check for a Posix-style build of LLDB.
while (rev_it != r_end) {
if (*rev_it == "LLDB.framework")
break;
++rev_it;
}
// We found a non-framework build of LLDB
if (rev_it == r_end)
return DefaultComputeClangResourceDirectory(lldb_shlib_spec, file_spec,
verify);
// Inside Xcode and in Xcode toolchains LLDB is always in lockstep
// with the Swift compiler, so it can reuse its Clang resource
// directory. This allows LLDB and the Swift compiler to share the
// same Clang module cache.
llvm::SmallString<256> clang_path;
const char *swift_clang_resource_dir = "usr/lib/swift/clang";
auto parent = std::next(rev_it);
if (parent != r_end && *parent == "SharedFrameworks") {
// This is the top-level LLDB in the Xcode.app bundle.
// E.g., "Xcode.app/Contents/SharedFrameworks/LLDB.framework/Versions/A"
raw_path.resize(parent - r_end);
llvm::sys::path::append(clang_path, raw_path,
"Developer/Toolchains/XcodeDefault.xctoolchain",
swift_clang_resource_dir);
if (!verify || VerifyClangPath(clang_path)) {
file_spec.GetDirectory().SetString(clang_path.c_str());
FileSystem::Instance().Resolve(file_spec);
return true;
}
} else if (parent != r_end && *parent == "PrivateFrameworks" &&
std::distance(parent, r_end) > 2) {
++parent;
++parent;
if (*parent == "System") {
// This is LLDB inside an Xcode toolchain.
// E.g., "Xcode.app/Contents/Developer/Toolchains/" \
// "My.xctoolchain/System/Library/PrivateFrameworks/LLDB.framework"
raw_path.resize(parent - r_end);
llvm::sys::path::append(clang_path, raw_path, swift_clang_resource_dir);
if (!verify || VerifyClangPath(clang_path)) {
file_spec.GetDirectory().SetString(clang_path.c_str());
FileSystem::Instance().Resolve(file_spec);
return true;
}
raw_path = lldb_shlib_spec.GetPath();
}
raw_path.resize(rev_it - r_end);
} else {
raw_path.resize(rev_it - r_end);
}
// Fall back to the Clang resource directory inside the framework.
raw_path.append("LLDB.framework/Resources/Clang");
file_spec.GetDirectory().SetString(raw_path.c_str());
FileSystem::Instance().Resolve(file_spec);
return true;
#endif // __APPLE__
}
FileSpec lldb_private::GetClangResourceDir() {
static FileSpec g_cached_resource_dir;
static llvm::once_flag g_once_flag;
llvm::call_once(g_once_flag, []() {
if (FileSpec lldb_file_spec = HostInfo::GetShlibDir())
ComputeClangResourceDirectory(lldb_file_spec, g_cached_resource_dir,
true);
Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
LLDB_LOGF(log, "GetClangResourceDir() => '%s'",
g_cached_resource_dir.GetPath().c_str());
});
return g_cached_resource_dir;
}
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