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This method allows one to create a directory, and optionally create all parent directories that do not exist. The original implementation would require that *all* directories along a path are writable by the user, including directories that already exist. For example, suppose we wanted to create the directory "/tmp/foo/bar", and the directory "/tmp" already exists, but not "/tmp/foo". Since "/tmp" is writable by all users, the original implementation would work, and create "/tmp/foo", followed by "/tmp/bar". A problem occurred, however if one wanted to created the directory "/Users/myuser/bar" (or equivalently "/home/myuser/bar"), and "/Users/myuser" already existed and is writable by the current user. The directory "/User/myuser" is writable by the user, but "/User" is not. The original implementation of createDirectoryOnDisk would return with failure since "/User" is not writable, even though "/User/mysuser" is writable. The new implementation works by recursively creating parents as needed, and thus doesn't need to check the permissions on every directory in a path. llvm-svn: 49162 |
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| .. | ||
| Unix | ||
| Win32 | ||
| Alarm.cpp | ||
| Disassembler.cpp | ||
| DynamicLibrary.cpp | ||
| IncludeFile.cpp | ||
| LICENSE.TXT | ||
| Makefile | ||
| Memory.cpp | ||
| Mutex.cpp | ||
| Path.cpp | ||
| Process.cpp | ||
| Program.cpp | ||
| README.txt | ||
| Signals.cpp | ||
| TimeValue.cpp | ||
Design Of lib/System
====================
The software in this directory is designed to completely shield LLVM from any
and all operating system specific functionality. It is not intended to be a
complete operating system wrapper (such as ACE), but only to provide the
functionality necessary to support LLVM.
The software located here, of necessity, has very specific and stringent design
rules. Violation of these rules means that cracks in the shield could form and
the primary goal of the library is defeated. By consistently using this library,
LLVM becomes more easily ported to new platforms since the only thing requiring
porting is this library.
Complete documentation for the library can be found in the file:
llvm/docs/SystemLibrary.html
or at this URL:
http://llvm.org/docs/SystemLibrary.html
While we recommend that you read the more detailed documentation, for the
impatient, here's a high level summary of the library's requirements.
1. No system header files are to be exposed through the interface.
2. Std C++ and Std C header files are okay to be exposed through the interface.
3. No exposed system-specific functions.
4. No exposed system-specific data.
5. Data in lib/System classes must use only simple C++ intrinsic types.
6. Errors are handled by returning "true" and setting an optional std::string
7. Library must not throw any exceptions, period.
8. Interface functions must not have throw() specifications.
9. No duplicate function impementations are permitted within an operating
system class.
To accomplish these requirements, the library has numerous design criteria that
must be satisfied. Here's a high level summary of the library's design criteria:
1. No unused functionality (only what LLVM needs)
2. High-Level Interfaces
3. Use Opaque Classes
4. Common Implementations</a></li>
5. Multiple Implementations</a></li>
6. Minimize Memory Allocation</a></li>
7. No Virtual Methods