1 files changed, 112 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..4bd3efda7fb0
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Host/common/FileCache.cpp
@@ -0,0 +1,112 @@
+//===-- FileCache.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 "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, uint32_t flags,
+                                    uint32_t mode, Status &error) {
+  if (!file_spec) {
+    error.SetErrorString("empty path");
+    return UINT64_MAX;
+  }
+  FileSP file_sp(new File());
+  error = FileSystem::Instance().Open(*file_sp, file_spec, flags, mode);
+  if (!file_sp->IsValid())
+    return UINT64_MAX;
+  lldb::user_id_t fd = file_sp->GetDescriptor();
+  m_cache[fd] = file_sp;
+  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;
+  }
+  FileSP file_sp = pos->second;
+  if (!file_sp) {
+    error.SetErrorString("invalid host backing file");
+    return false;
+  }
+  error = file_sp->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;
+  }
+  FileSP file_sp = pos->second;
+  if (!file_sp) {
+    error.SetErrorString("invalid host backing file");
+    return UINT64_MAX;
+  }
+  if (static_cast<uint64_t>(file_sp->SeekFromStart(offset, &error)) != offset ||
+      error.Fail())
+    return UINT64_MAX;
+  size_t bytes_written = src_len;
+  error = file_sp->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;
+  }
+  FileSP file_sp = pos->second;
+  if (!file_sp) {
+    error.SetErrorString("invalid host backing file");
+    return UINT64_MAX;
+  }
+  if (static_cast<uint64_t>(file_sp->SeekFromStart(offset, &error)) != offset ||
+      error.Fail())
+    return UINT64_MAX;
+  size_t bytes_read = dst_len;
+  error = file_sp->Read(dst, bytes_read);
+  if (error.Fail())
+    return UINT64_MAX;
+  return bytes_read;
+}