llvm-6502/lib/System
Dan Gohman 4e0a9c51b4 Delete unused variables.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118128 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-03 00:09:12 +00:00
..
Unix Delete unused variables. 2010-11-03 00:09:12 +00:00
Win32 appendSuffix: don't append a dot when the suffix is empty. 2010-11-02 22:18:37 +00:00
Alarm.cpp
Atomic.cpp
CMakeLists.txt Build with RTTI and exceptions disabled. Only in GCC for now. 2010-10-17 02:26:16 +00:00
Disassembler.cpp Avoid "variable 'bits' set but not used [-Wunused-but-set-variable]" 2010-06-10 16:23:15 +00:00
DynamicLibrary.cpp Fix failure of unittests/ExecutionEngine/JIT/MultiJITTest.cpp on 2010-08-17 15:42:43 +00:00
Errno.cpp
Host.cpp Add one more Core i7 model number. 2010-09-19 17:54:28 +00:00
IncludeFile.cpp
Makefile Remove try/catch(...) from Win32/Signals.inc. 2010-10-27 09:09:04 +00:00
Memory.cpp Tell Valgrind when we modify already-executed machine code so it knows 2010-03-15 04:57:55 +00:00
Mutex.cpp
Path.cpp appendSuffix: don't append a dot when the suffix is empty. 2010-11-02 22:18:37 +00:00
Process.cpp
Program.cpp Make Program::Wait differentiate execution failure due to the file 2010-10-29 16:54:25 +00:00
README.txt
RWMutex.cpp Remove remaining uses of ATTRIBUTE_UNUSED on variables, and delete three 2010-10-20 08:27:02 +00:00
SearchForAddressOfSpecialSymbol.cpp Change explicit search Apple specific code to only reference __eprintf on x86. 2010-10-11 21:34:24 +00:00
Signals.cpp
Threading.cpp
ThreadLocal.cpp Fix --disable-threads build, PR7949. 2010-08-20 20:54:37 +00:00
TimeValue.cpp
Valgrind.cpp Tell Valgrind when we modify already-executed machine code so it knows 2010-03-15 04:57:55 +00:00

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