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History

Chris Lattner c4ab50bd33 move tier out of an anonymous namespace, it doesn't make sense to for it to be an an anon namespace and be in a header. Eliminate some extraenous uses of tie. llvm-svn: 135669		2011-07-21 06:21:31 +00:00
..
Unix
Windows	Windows/DynamicLibrary.inc: Fix trivial warnings. Thanks to John Myers!	2011-07-09 08:41:20 +00:00
Allocator.cpp
APFloat.cpp	Add APInt(numBits, ArrayRef<uint64_t> bigVal) constructor to prevent future ambiguity	2011-07-18 21:45:40 +00:00
APInt.cpp	Add APInt(numBits, ArrayRef<uint64_t> bigVal) constructor to prevent future ambiguity	2011-07-18 21:45:40 +00:00
APSInt.cpp
Atomic.cpp
BranchProbability.cpp
circular_raw_ostream.cpp
CMakeLists.txt
CommandLine.cpp
ConstantRange.cpp
COPYRIGHT.regex
CrashRecoveryContext.cpp
DAGDeltaAlgorithm.cpp
Debug.cpp
DeltaAlgorithm.cpp
Disassembler.cpp
Dwarf.cpp
DynamicLibrary.cpp
Errno.cpp
ErrorHandling.cpp
FileUtilities.cpp
FoldingSet.cpp	Simplify & microoptimize code. No intended functionality change.	2011-07-18 00:00:20 +00:00
FormattedStream.cpp
GraphWriter.cpp
Host.cpp
IncludeFile.cpp
IntEqClasses.cpp
IntervalMap.cpp
IsInf.cpp
IsNAN.cpp
Makefile
ManagedStatic.cpp
Memory.cpp
MemoryBuffer.cpp
MemoryObject.cpp
Mutex.cpp
Path.cpp
PathV2.cpp
PluginLoader.cpp
PrettyStackTrace.cpp
Process.cpp
Program.cpp
raw_os_ostream.cpp
raw_ostream.cpp
README.txt.system
regcclass.h
regcname.h
regcomp.c
regengine.inc
regerror.c
regex2.h
regex_impl.h
Regex.cpp
regexec.c
regfree.c
regstrlcpy.c
regutils.h
RWMutex.cpp
SearchForAddressOfSpecialSymbol.cpp
Signals.cpp
SmallPtrSet.cpp
SmallVector.cpp
SourceMgr.cpp
Statistic.cpp
StringExtras.cpp	move tier out of an anonymous namespace, it doesn't make sense	2011-07-21 06:21:31 +00:00
StringMap.cpp
StringPool.cpp
StringRef.cpp
system_error.cpp
SystemUtils.cpp
TargetRegistry.cpp
Threading.cpp
ThreadLocal.cpp
Timer.cpp
TimeValue.cpp
ToolOutputFile.cpp
Triple.cpp
Twine.cpp	In Twine::str(), if the Twine stores only a std::string, just return a direct copy of that instead of first copying to a SmallString and converting that to a std::string. Also fix some indentation.	2011-07-15 11:05:37 +00:00
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