llvm-mirror

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History

Oscar Fuentes d4427a6b63 Fixes the Atomic implementation if compiled by MSVC compiler. sys::cas_flag should be long on this platform, InterlockedAdd() is defined only for the Itanium architecture (according to MSDN). Patch by Michael Beck! llvm-svn: 90748		2009-12-07 05:29:59 +00:00
..
Unix	Remove dead returns.	2009-11-29 17:42:58 +00:00
Win32	API change Path::isSpecialFile to Path::isRegularFile, improve semantics in regards to comments from 89765 post review.	2009-11-25 06:32:19 +00:00
Alarm.cpp
Atomic.cpp	Fixes the Atomic implementation if compiled by MSVC compiler.	2009-12-07 05:29:59 +00:00
CMakeLists.txt	Use CMAKE_DL_LIBS instead of raw library name. Fixes bug 5536.	2009-11-19 23:21:43 +00:00
Disassembler.cpp	This void is implicit in C++.	2009-08-12 22:10:57 +00:00
DynamicLibrary.cpp	Remove unused includes.	2009-10-25 22:38:41 +00:00
Errno.cpp
Host.cpp	Unbreak x64 MSVC build. Patch by Nicolas Capens!	2009-11-19 12:17:31 +00:00
IncludeFile.cpp
Makefile	MingW build fixes	2009-10-02 19:36:31 +00:00
Memory.cpp	Experimental fix for PR4960.	2009-09-12 23:29:02 +00:00
Mutex.cpp	Tweak code into an equivalent form for which icc	2009-09-06 10:53:22 +00:00
Path.cpp	Remove unused includes.	2009-10-25 22:38:41 +00:00
Process.cpp
Program.cpp
README.txt
RWMutex.cpp	Tweak code into an equivalent form for which icc	2009-09-06 10:53:22 +00:00
Signals.cpp
Threading.cpp
ThreadLocal.cpp
TimeValue.cpp

README.txt

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