llvm-6502/lib/System
Jim Grosbach cce6c297c5 On Darwin ARM, memory needs special handling to do JIT. This patch expands
this handling to work properly for modifying stub functions, relocations
back to entry points after JIT compilation, etc..


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57013 91177308-0d34-0410-b5e6-96231b3b80d8
2008-10-03 16:17:20 +00:00
..
Unix On Darwin ARM, memory needs special handling to do JIT. This patch expands 2008-10-03 16:17:20 +00:00
Win32 Add llvm::sys::{osName,osVersion} for retrieving operating system name 2008-10-02 01:17:28 +00:00
Alarm.cpp
CMakeLists.txt CMake: Added Host.cpp to lib/System/CMakeLists.txt. 2008-10-02 17:39:29 +00:00
Disassembler.cpp
DynamicLibrary.cpp open plugins with RTLD_GLOBAL, pointed out by Bram Adams. 2008-07-10 00:52:20 +00:00
Host.cpp Add llvm::sys::{osName,osVersion} for retrieving operating system name 2008-10-02 01:17:28 +00:00
IncludeFile.cpp
LICENSE.TXT
Makefile
Memory.cpp On Darwin ARM, memory needs special handling to do JIT. This patch expands 2008-10-03 16:17:20 +00:00
Mutex.cpp Make LLVM compile on DragonFly BSD (PR2499). 2008-06-26 10:36:58 +00:00
Path.cpp Handle bitcode wrappers. 2008-07-22 18:00:36 +00:00
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