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History

Torok Edwin 46925cc515 Fix TimeValue::now() on Unix. TimeValue()::now().toEpochTime() is supposed to be the same as time(), but it wasn't, because toEpoch subtracted PosixZeroTime, but now() didn't add PosixZeroTime! Add a unittest to check this works. llvm-svn: 94178		2010-01-22 15:51:31 +00:00
..
Unix	Fix TimeValue::now() on Unix.	2010-01-22 15:51:31 +00:00
Win32	Remove spurious semicolon.	2010-01-14 20:19:51 +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
DynamicLibrary.cpp	Alternative fix to make sure that the extern declarations used by	2009-12-23 19:12:50 +00:00
Errno.cpp
Host.cpp	Stubs for getHostCPUFeatures API. This implements part of PR5389.	2010-01-19 21:26:05 +00:00
IncludeFile.cpp
Makefile
Memory.cpp
Mutex.cpp
Path.cpp	Make Path use StringRef instead of std::string where possible.	2009-12-17 21:02:39 +00:00
Process.cpp
Program.cpp
README.txt
RWMutex.cpp
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