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

2 files changed, 22 insertions, 2 deletions

diff --git a/include/Support/FileUtilities.h b/include/Support/FileUtilities.h
index 0543d76..d5db63f 100644
--- a/include/Support/FileUtilities.h
+++ b/include/Support/FileUtilities.h
@@ -42,7 +42,7 @@ bool IsSharedObject(const std::string &FN);
 /// FileOpenable - Returns true IFF Filename names an existing regular file
 /// which we can successfully open.
 ///
-bool FileOpenable (const std::string &Filename);
+bool FileOpenable(const std::string &Filename);
 
 /// DiffFiles - Compare the two files specified, returning true if they are
 /// different or if there is a file error.  If you specify a string to fill in
@@ -93,6 +93,16 @@ long long getFileSize(const std::string &Filename);
 /// not exist or there is an error getting the time-stamp, zero is returned.
 unsigned long long getFileTimestamp(const std::string &Filename);
 
+/// 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 *ReadFileIntoAddressSpace(const std::string &Filename, unsigned &Length);
+
+/// UnmapFileFromAddressSpace - Remove the specified file from the current
+/// address space.
+void UnmapFileFromAddressSpace(void *Buffer, unsigned Length);
+
 
 /// FDHandle - Simple handle class to make sure a file descriptor gets closed
 /// when the object is destroyed.  This handle acts similarly to an
diff --git a/include/llvm/Support/FileUtilities.h b/include/llvm/Support/FileUtilities.h
index 0543d76..d5db63f 100644
--- a/include/llvm/Support/FileUtilities.h
+++ b/include/llvm/Support/FileUtilities.h
@@ -42,7 +42,7 @@ bool IsSharedObject(const std::string &FN);
 /// FileOpenable - Returns true IFF Filename names an existing regular file
 /// which we can successfully open.
 ///
-bool FileOpenable (const std::string &Filename);
+bool FileOpenable(const std::string &Filename);
 
 /// DiffFiles - Compare the two files specified, returning true if they are
 /// different or if there is a file error.  If you specify a string to fill in
@@ -93,6 +93,16 @@ long long getFileSize(const std::string &Filename);
 /// not exist or there is an error getting the time-stamp, zero is returned.
 unsigned long long getFileTimestamp(const std::string &Filename);
 
+/// 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 *ReadFileIntoAddressSpace(const std::string &Filename, unsigned &Length);
+
+/// UnmapFileFromAddressSpace - Remove the specified file from the current
+/// address space.
+void UnmapFileFromAddressSpace(void *Buffer, unsigned Length);
+
 
 /// FDHandle - Simple handle class to make sure a file descriptor gets closed
 /// when the object is destroyed.  This handle acts similarly to an