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Implement Path::MapInFilePages/UnMapFilePages on unix, which 

provides fast MappedFile::getFile for large files.

llvm-svn: 49034
This commit is contained in:
Chris Lattner 2008-04-01 06:16:24 +00:00
parent 4f6002c79a
commit 4c5e15f7da
2 changed files with 11 additions and 7 deletions
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3
llvm/lib/System/Unix/MappedFile.inc
View File

@ -75,7 +75,6 @@ const void* MappedFile::map(std::string* ErrMsg) {
assert(MapInfo && "MappedFile not initialized");
if (isMapped()) return BasePtr;
int prot = PROT_READ;
int flags = MAP_PRIVATE;
#ifdef MAP_FILE
flags |= MAP_FILE;
@ -83,7 +82,7 @@ const void* MappedFile::map(std::string* ErrMsg) {
size_t PageSize = Process::GetPageSize();
size_t map_size = ((MapInfo->Size / PageSize)+1) * PageSize;
BasePtr = ::mmap(0, map_size, prot, flags, MapInfo->FD, 0);
BasePtr = ::mmap(0, map_size, PROT_READ, flags, MapInfo->FD, 0);
if (BasePtr == MAP_FAILED) {
MakeErrMsg(ErrMsg, "Can't map file:" + Path.toString());
return 0;

15
llvm/lib/System/Unix/Path.inc
View File

@ -745,14 +745,19 @@ Path::makeUnique(bool reuse_current, std::string* ErrMsg) {
return false;
}
/// MapInFilePages - Not yet implemented on win32.
const char *Path::MapInFilePages(int FD, uint64_t FileSize) {
return 0;
int Flags = MAP_PRIVATE;
#ifdef MAP_FILE
Flags |= MAP_FILE;
#endif
void *BasePtr = ::mmap(0, FileSize, PROT_READ, Flags, FD, 0);
if (BasePtr == MAP_FAILED)
return 0;
return BasePtr;
}
/// MapInFilePages - Not yet implemented on win32.
void Path::UnMapFilePages(const char *Base, uint64_t FileSize) {
assert(0 && "NOT IMPLEMENTED");
void Path::UnMapFilePages(const char *BasePtr, uint64_t FileSize) {
::munmap(BasePtr, FileSize);
}
} // end llvm namespace