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-rw-r--r--contrib/llvm-project/lldb/source/Host/common/FileCache.cpp114
1 files changed, 114 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Host/common/FileCache.cpp b/contrib/llvm-project/lldb/source/Host/common/FileCache.cpp
new file mode 100644
index 000000000000..da9a748e2f13
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Host/common/FileCache.cpp
@@ -0,0 +1,114 @@
+//===-- FileCache.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 "lldb/Host/FileCache.h"
+
+#include "lldb/Host/File.h"
+#include "lldb/Host/FileSystem.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+FileCache *FileCache::m_instance = nullptr;
+
+FileCache &FileCache::GetInstance() {
+ if (m_instance == nullptr)
+ m_instance = new FileCache();
+
+ return *m_instance;
+}
+
+lldb::user_id_t FileCache::OpenFile(const FileSpec &file_spec,
+ File::OpenOptions flags, uint32_t mode,
+ Status &error) {
+ if (!file_spec) {
+ error.SetErrorString("empty path");
+ return UINT64_MAX;
+ }
+ auto file = FileSystem::Instance().Open(file_spec, flags, mode);
+ if (!file) {
+ error = file.takeError();
+ return UINT64_MAX;
+ }
+ lldb::user_id_t fd = file.get()->GetDescriptor();
+ m_cache[fd] = std::move(file.get());
+ return fd;
+}
+
+bool FileCache::CloseFile(lldb::user_id_t fd, Status &error) {
+ if (fd == UINT64_MAX) {
+ error.SetErrorString("invalid file descriptor");
+ return false;
+ }
+ FDToFileMap::iterator pos = m_cache.find(fd);
+ if (pos == m_cache.end()) {
+ error.SetErrorStringWithFormat("invalid host file descriptor %" PRIu64, fd);
+ return false;
+ }
+ FileUP &file_up = pos->second;
+ if (!file_up) {
+ error.SetErrorString("invalid host backing file");
+ return false;
+ }
+ error = file_up->Close();
+ m_cache.erase(pos);
+ return error.Success();
+}
+
+uint64_t FileCache::WriteFile(lldb::user_id_t fd, uint64_t offset,
+ const void *src, uint64_t src_len,
+ Status &error) {
+ if (fd == UINT64_MAX) {
+ error.SetErrorString("invalid file descriptor");
+ return UINT64_MAX;
+ }
+ FDToFileMap::iterator pos = m_cache.find(fd);
+ if (pos == m_cache.end()) {
+ error.SetErrorStringWithFormat("invalid host file descriptor %" PRIu64, fd);
+ return false;
+ }
+ FileUP &file_up = pos->second;
+ if (!file_up) {
+ error.SetErrorString("invalid host backing file");
+ return UINT64_MAX;
+ }
+ if (static_cast<uint64_t>(file_up->SeekFromStart(offset, &error)) != offset ||
+ error.Fail())
+ return UINT64_MAX;
+ size_t bytes_written = src_len;
+ error = file_up->Write(src, bytes_written);
+ if (error.Fail())
+ return UINT64_MAX;
+ return bytes_written;
+}
+
+uint64_t FileCache::ReadFile(lldb::user_id_t fd, uint64_t offset, void *dst,
+ uint64_t dst_len, Status &error) {
+ if (fd == UINT64_MAX) {
+ error.SetErrorString("invalid file descriptor");
+ return UINT64_MAX;
+ }
+ FDToFileMap::iterator pos = m_cache.find(fd);
+ if (pos == m_cache.end()) {
+ error.SetErrorStringWithFormat("invalid host file descriptor %" PRIu64, fd);
+ return false;
+ }
+ FileUP &file_up = pos->second;
+ if (!file_up) {
+ error.SetErrorString("invalid host backing file");
+ return UINT64_MAX;
+ }
+ if (static_cast<uint64_t>(file_up->SeekFromStart(offset, &error)) != offset ||
+ error.Fail())
+ return UINT64_MAX;
+ size_t bytes_read = dst_len;
+ error = file_up->Read(dst, bytes_read);
+ if (error.Fail())
+ return UINT64_MAX;
+ return bytes_read;
+}