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author | Chris Lattner <sabre@nondot.org> | 2004-05-28 00:23:48 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2004-05-28 00:23:48 +0000 |
commit | eb082995180756068af35bb826a9017975d87a51 (patch) | |
tree | bb625254fd242c104f0c0698c8302f90b2573ee4 /lib/Support/FileUtilities.cpp | |
parent | 4e6620c9e0745ed19a8fe9844c43415afbb14ad8 (diff) | |
download | external_llvm-eb082995180756068af35bb826a9017975d87a51.zip external_llvm-eb082995180756068af35bb826a9017975d87a51.tar.gz external_llvm-eb082995180756068af35bb826a9017975d87a51.tar.bz2 |
Add a pair of functions to hide system specific details of mapping a file in for reading.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13863 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Support/FileUtilities.cpp')
-rw-r--r-- | lib/Support/FileUtilities.cpp | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/lib/Support/FileUtilities.cpp b/lib/Support/FileUtilities.cpp index 1b8df43..74df8b2 100644 --- a/lib/Support/FileUtilities.cpp +++ b/lib/Support/FileUtilities.cpp @@ -14,8 +14,10 @@ #include "Support/FileUtilities.h" #include "Config/unistd.h" +#include "Config/fcntl.h" #include "Config/sys/stat.h" #include "Config/sys/types.h" +#include "Config/sys/mman.h" #include <fstream> #include <iostream> #include <cstdio> @@ -215,8 +217,40 @@ unsigned long long llvm::getFileTimestamp(const std::string &Filename) { return StatBuf.st_mtime; } +/// ReadFileIntoAddressSpace - Attempt to map the specific file into the +/// address space of the current process for reading. If this succeeds, +/// return the address of the buffer and the length of the file mapped. On +/// failure, return null. +void *llvm::ReadFileIntoAddressSpace(const std::string &Filename, + unsigned &Length) { +#ifdef HAVE_MMAP_FILE + Length = getFileSize(Filename); + if ((int)Length == -1) return 0; + FDHandle FD(open(Filename.c_str(), O_RDONLY)); + if (FD == -1) return 0; + // mmap in the file all at once... + void *Buffer = (void*)mmap(0, Length, PROT_READ, MAP_PRIVATE, FD, 0); + + if (Buffer == (void*)MAP_FAILED) + return 0; + return Buffer; +#else + // FIXME: implement with read/write + return 0; +#endif +} + +/// UnmapFileFromAddressSpace - Remove the specified file from the current +/// address space. +void llvm::UnmapFileFromAddressSpace(void *Buffer, unsigned Length) { +#ifdef HAVE_MMAP_FILE + munmap((char*)Buffer, Length); +#else + free(Buffer); +#endif +} //===----------------------------------------------------------------------===// // FDHandle class implementation |