From 9ffd19af2e2a17ccd0c7ad7b4cf6d8c3e9a56bae Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 1 Apr 2008 06:16:24 +0000
Subject: Implement Path::MapInFilePages/UnMapFilePages on unix, which provides
 fast MappedFile::getFile for large files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49034 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/System/Unix/MappedFile.inc |  3 +--
 lib/System/Unix/Path.inc       | 15 ++++++++++-----
 2 files changed, 11 insertions(+), 7 deletions(-)

(limited to 'lib')

diff --git a/lib/System/Unix/MappedFile.inc b/lib/System/Unix/MappedFile.inc
index 35efaa6..c85a53d 100644
--- a/lib/System/Unix/MappedFile.inc
+++ b/lib/System/Unix/MappedFile.inc
@@ -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;
diff --git a/lib/System/Unix/Path.inc b/lib/System/Unix/Path.inc
index b0578dc..0707de6 100644
--- a/lib/System/Unix/Path.inc
+++ b/lib/System/Unix/Path.inc
@@ -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
-- 
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