From 45e6c2406dcb8c368805707d4f84f15d8fd09967 Mon Sep 17 00:00:00 2001 From: Rafael Espindola Date: Tue, 18 Jun 2013 19:34:49 +0000 Subject: [PATCH] Add a GetUniqueID that will replace the uniqueID of PathV1.h. llvm-svn: 184217 --- llvm/include/llvm/Support/FileSystem.h | 2 ++ llvm/lib/Support/Unix/PathV2.inc | 12 ++++++++++++ llvm/lib/Support/Windows/PathV2.inc | 14 ++++++++++++++ 3 files changed, 28 insertions(+) diff --git a/llvm/include/llvm/Support/FileSystem.h b/llvm/include/llvm/Support/FileSystem.h index 11c78cc93941..6de8759dda2d 100644 --- a/llvm/include/llvm/Support/FileSystem.h +++ b/llvm/include/llvm/Support/FileSystem.h @@ -556,6 +556,8 @@ file_magic identify_magic(StringRef magic); /// platform specific error_code. error_code identify_magic(const Twine &path, file_magic &result); +error_code GetUniqueID(const Twine Path, uint64_t &Result); + /// This class represents a memory mapped file. It is based on /// boost::iostreams::mapped_file. class mapped_file_region { diff --git a/llvm/lib/Support/Unix/PathV2.inc b/llvm/lib/Support/Unix/PathV2.inc index c98c21d07cce..9ea4f9ed51ad 100644 --- a/llvm/lib/Support/Unix/PathV2.inc +++ b/llvm/lib/Support/Unix/PathV2.inc @@ -350,6 +350,18 @@ error_code file_size(const Twine &path, uint64_t &result) { return error_code::success(); } +error_code GetUniqueID(const Twine Path, uint64_t &Result) { + SmallString<128> Storage; + StringRef P = Path.toNullTerminatedStringRef(Storage); + + struct stat Status; + if (::stat(P.begin(), &Status) != 0) + return error_code(errno, system_category()); + + Result = Status.st_ino; + return error_code::success(); +} + error_code status(const Twine &path, file_status &result) { SmallString<128> path_storage; StringRef p = path.toNullTerminatedStringRef(path_storage); diff --git a/llvm/lib/Support/Windows/PathV2.inc b/llvm/lib/Support/Windows/PathV2.inc index ea383895f2a6..3b2992d5a301 100644 --- a/llvm/lib/Support/Windows/PathV2.inc +++ b/llvm/lib/Support/Windows/PathV2.inc @@ -413,6 +413,20 @@ error_code file_size(const Twine &path, uint64_t &result) { return error_code::success(); } +error_code GetUniqueID(const Twine Path, uint64_t &Result) { + // FIXME: this is only unique if the file is accessed by the same file path. + // How do we do this for C:\dir\file and ..\dir\file ? Unix has inode + // numbers, but the concept doesn't exist in Windows. + SmallString<128> Storage; + StringRef P = Path.toStringRef(Storage); + uint64_t UniqueID = 0; + for (StringRef::iterator I = P.begin(), E = P.end(); I != E; ++I) + UniqueID += *I; + Result = UniqueID; + + return error_code::success(); +} + static bool isReservedName(StringRef path) { // This list of reserved names comes from MSDN, at: // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx