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History

Douglas Gregor 0044fad1e6 Rip out realpath() support. It's expensive, and often a bad idea, and I have another way to achieve the same goal. llvm-svn: 125239		2011-02-09 23:33:15 +00:00
..
Unix	Rip out realpath() support. It's expensive, and often a bad idea, and	2011-02-09 23:33:15 +00:00
Windows	Windows/Windows.h: Redefine _WIN32_WINNT here. mingw-w64 tends to define it as 0x0502 in its headers.	2011-02-09 04:18:30 +00:00
Allocator.cpp
APFloat.cpp	Null initialize a few variables flagged by	2011-01-23 17:05:06 +00:00
APInt.cpp	PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() and	2010-12-07 08:25:19 +00:00
APSInt.cpp
Atomic.cpp
circular_raw_ostream.cpp
CMakeLists.txt	Add ADT/IntEqClasses.h as a light-weight implementation of EquivalenceClasses.h.	2010-12-21 00:04:46 +00:00
CommandLine.cpp	Support/CommandLine: Fix LookupNearestOption to also search extra option names.	2011-01-24 17:27:17 +00:00
ConstantRange.cpp	PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() and	2010-12-07 08:25:19 +00:00
COPYRIGHT.regex
CrashRecoveryContext.cpp
DAGDeltaAlgorithm.cpp
Debug.cpp
DeltaAlgorithm.cpp
Disassembler.cpp
Dwarf.cpp
DynamicLibrary.cpp	Don't leak the mutex when loading dynamic libraries.	2010-12-07 07:56:20 +00:00
Errno.cpp	lib/Support/Errno.cpp: Check strerror_s() with HAVE_DECL_STRERROR_S in config.h.*.	2011-02-09 04:18:48 +00:00
ErrorHandling.cpp
FileUtilities.cpp	MemoryBuffer now return an error_code and returns a OwningPtr<MemoryBuffer> via an out parm.	2010-12-16 03:29:14 +00:00
FoldingSet.cpp
FormattedStream.cpp	Add missing standard headers. Patch by Joerg Sonnenberger!	2010-12-19 20:43:38 +00:00
GraphWriter.cpp
Host.cpp
IncludeFile.cpp
IntEqClasses.cpp	Use IntEqClasses to compute connected components of live intervals.	2010-12-21 00:48:17 +00:00
IntervalMap.cpp	Add IntervalMap::iterator::set{Start,Stop,Value} methods that allow limited	2010-12-03 19:02:00 +00:00
IsInf.cpp
IsNAN.cpp
Makefile
ManagedStatic.cpp
Memory.cpp
MemoryBuffer.cpp	Don't open the file again in the gold plugin. To be able to do this, update	2011-02-08 22:40:47 +00:00
MemoryObject.cpp
Mutex.cpp
Path.cpp	Support/PathV2: Add identify_magic.	2011-01-15 20:39:36 +00:00
PathV2.cpp	Support/PathV2: Add identify_magic.	2011-01-15 20:39:36 +00:00
PluginLoader.cpp
PrettyStackTrace.cpp	Change all self assignments X=X to (void)X, so that we can turn on a	2010-12-23 00:58:24 +00:00
Process.cpp
Program.cpp
raw_os_ostream.cpp
raw_ostream.cpp	raw_fd_ostream: Add a SetUseAtomicWrites() method (uses writev).	2011-02-03 03:32:32 +00:00
README.txt.system
regcclass.h
regcname.h
regcomp.c
regengine.inc
regerror.c
regex2.h
regex_impl.h
Regex.cpp
regexec.c	lib/Support/regexec.c: Let Regex LLP64-aware.	2010-12-16 01:48:15 +00:00
regfree.c
regstrlcpy.c
regutils.h
RWMutex.cpp
SearchForAddressOfSpecialSymbol.cpp	build: Go back to dropping __eprintf reference when building with Clang, see	2010-12-07 16:29:44 +00:00
Signals.cpp
SmallPtrSet.cpp
SmallVector.cpp
SourceMgr.cpp	MemoryBuffer now return an error_code and returns a OwningPtr<MemoryBuffer> via an out parm.	2010-12-16 03:29:14 +00:00
Statistic.cpp
StringExtras.cpp
StringMap.cpp	Change all self assignments X=X to (void)X, so that we can turn on a	2010-12-23 00:58:24 +00:00
StringPool.cpp
StringRef.cpp	PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() and	2010-12-07 08:25:19 +00:00
system_error.cpp	Support/MemoryBuffer: Replace all uses of std::string *ErrMsg with error_code &ec. And fix clients.	2010-12-09 17:36:48 +00:00
SystemUtils.cpp
TargetRegistry.cpp
Threading.cpp
ThreadLocal.cpp
Timer.cpp
TimeValue.cpp
ToolOutputFile.cpp
Triple.cpp	Fix a clang warning.	2011-02-05 18:19:35 +00:00
Twine.cpp
Valgrind.cpp

README.txt.system

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
 5. Multiple Implementations
 6. Minimize Memory Allocation
 7. No Virtual Methods