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[VFS] Add an in-memory file system implementation.

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This is a simple file system tree of memory buffers that can be filled by a
client. In conjunction with an OverlayFS it can be used to make virtual
files accessible right next to physical files. This can be used as a
replacement for the virtual file handling in FileManager and which I intend
to remove eventually.

llvm-svn: 249315
This commit is contained in:
Benjamin Kramer
2015-10-05 13:55:14 +00:00
parent 5532ef1a5d
commit a25dcfd906
4 changed files with 352 additions and 11 deletions
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67
clang/unittests/Basic/VirtualFileSystemTest.cpp
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@@ -515,6 +515,73 @@ TEST(VirtualFileSystemTest, HiddenInIteration) {
}
}
class InMemoryFileSystemTest : public ::testing::Test {
protected:
clang::vfs::InMemoryFileSystem FS;
};
TEST_F(InMemoryFileSystemTest, IsEmpty) {
auto Stat = FS.status("/a");
ASSERT_EQ(errc::no_such_file_or_directory, Stat.getError()) << FS.toString();
Stat = FS.status("/");
ASSERT_EQ(errc::no_such_file_or_directory, Stat.getError()) << FS.toString();
}
TEST_F(InMemoryFileSystemTest, WindowsPath) {
FS.addFile("c:/windows/system128/foo.cpp", 0, MemoryBuffer::getMemBuffer(""));
auto Stat = FS.status("c:");
ASSERT_FALSE(Stat.getError()) << Stat.getError() << FS.toString();
Stat = FS.status("c:/windows/system128/foo.cpp");
ASSERT_FALSE(Stat.getError()) << Stat.getError() << FS.toString();
FS.addFile("d:/windows/foo.cpp", 0, MemoryBuffer::getMemBuffer(""));
Stat = FS.status("d:/windows/foo.cpp");
ASSERT_FALSE(Stat.getError()) << Stat.getError() << FS.toString();
}
TEST_F(InMemoryFileSystemTest, OverlayFile) {
FS.addFile("/a", 0, MemoryBuffer::getMemBuffer("a"));
auto Stat = FS.status("/");
ASSERT_FALSE(Stat.getError()) << Stat.getError() << FS.toString();
Stat = FS.status("/a");
ASSERT_FALSE(Stat.getError()) << Stat.getError() << "\n" << FS.toString();
ASSERT_EQ("/a", Stat->getName());
}
TEST_F(InMemoryFileSystemTest, OpenFileForRead) {
FS.addFile("/a", 0, MemoryBuffer::getMemBuffer("a"));
auto File = FS.openFileForRead("/a");
ASSERT_EQ("a", (*(*File)->getBuffer("ignored"))->getBuffer());
File = FS.openFileForRead("/a"); // Open again.
ASSERT_EQ("a", (*(*File)->getBuffer("ignored"))->getBuffer());
File = FS.openFileForRead("/");
ASSERT_EQ(errc::invalid_argument, File.getError()) << FS.toString();
File = FS.openFileForRead("/b");
ASSERT_EQ(errc::no_such_file_or_directory, File.getError()) << FS.toString();
}
TEST_F(InMemoryFileSystemTest, DirectoryIteration) {
FS.addFile("/a", 0, MemoryBuffer::getMemBuffer(""));
FS.addFile("/b/c", 0, MemoryBuffer::getMemBuffer(""));
std::error_code EC;
vfs::directory_iterator I = FS.dir_begin("/", EC);
ASSERT_FALSE(EC);
ASSERT_EQ("/a", I->getName());
I.increment(EC);
ASSERT_FALSE(EC);
ASSERT_EQ("/b", I->getName());
I.increment(EC);
ASSERT_FALSE(EC);
ASSERT_EQ(vfs::directory_iterator(), I);
I = FS.dir_begin("/b", EC);
ASSERT_FALSE(EC);
ASSERT_EQ("/b/c", I->getName());
I.increment(EC);
ASSERT_FALSE(EC);
ASSERT_EQ(vfs::directory_iterator(), I);
}
// NOTE: in the tests below, we use '//root/' as our root directory, since it is
// a legal *absolute* path on Windows as well as *nix.
class VFSFromYAMLTest : public ::testing::Test {