/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <err.h>
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#include <fcntl.h>
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#include <fts.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <memory>
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#include <string>
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#include <android-base/unique_fd.h>
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#include <llvm/ADT/IntrusiveRefCntPtr.h>
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#include <llvm/Support/MemoryBuffer.h>
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#include <llvm/Support/VirtualFileSystem.h>
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#include "Utils.h"
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using android::base::unique_fd;
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using namespace llvm::vfs;
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static void addDirectoryToVFS(InMemoryFileSystem* vfs, const std::string& path) {
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char* paths[] = { const_cast<char*>(path.c_str()), nullptr };
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std::unique_ptr<FTS, decltype(&fts_close)> fts(
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fts_open(paths, FTS_COMFOLLOW | FTS_LOGICAL | FTS_NOCHDIR, nullptr), fts_close);
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if (!fts) {
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err(1, "failed to open directory %s", path.c_str());
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}
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while (FTSENT* ent = fts_read(fts.get())) {
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if ((ent->fts_info & FTS_F) == 0) {
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continue;
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}
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const char* file_path = ent->fts_accpath;
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unique_fd fd(open(file_path, O_RDONLY | O_CLOEXEC));
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if (fd == -1) {
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err(1, "failed to open header '%s'", file_path);
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}
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auto buffer_opt = llvm::MemoryBuffer::getOpenFile(fd, file_path, -1, false, false);
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if (!buffer_opt) {
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errx(1, "failed to map header '%s'", file_path);
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}
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if (!vfs->addFile(file_path, ent->fts_statp->st_mtime, std::move(buffer_opt.get()))) {
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errx(1, "failed to add file '%s'", file_path);
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}
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}
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}
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llvm::IntrusiveRefCntPtr<FileSystem> createCommonVFS(const std::string& header_dir,
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const std::string& dependency_dir,
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bool add_versioning_header) {
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auto vfs = std::make_unique<InMemoryFileSystem>();
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addDirectoryToVFS(vfs.get(), header_dir);
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if (!dependency_dir.empty()) {
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addDirectoryToVFS(vfs.get(), dependency_dir);
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}
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if (add_versioning_header) {
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const char* top = getenv("ANDROID_BUILD_TOP");
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if (!top) {
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errx(1, "-i passed, but ANDROID_BUILD_TOP is unset");
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}
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std::string header_path = std::string(top) + "/bionic/libc/include/android/versioning.h";
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auto buffer_opt = llvm::MemoryBuffer::getFile(header_path);
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if (!buffer_opt) {
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err(1, "failed to open %s", header_path.c_str());
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}
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vfs->addFile("android/versioning.h", 0, std::move(buffer_opt.get()));
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}
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return llvm::IntrusiveRefCntPtr<FileSystem>(vfs.release());
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}
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