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History

Benjamin Kramer f7427d954c APInt: Simplify code. No functionality change. llvm-svn: 183073		2013-06-01 11:26:39 +00:00
..
Unix	Remove declaration of __clear_cache for __APPLE__. <rdar://problem/13924072>	2013-05-19 20:33:51 +00:00
Windows	Fix build on Windows	2013-05-15 09:00:30 +00:00
Allocator.cpp
APFloat.cpp	APFloat: Use isDenormal instead of hand-rolled code to check for denormals.	2013-06-01 11:26:33 +00:00
APInt.cpp	APInt: Simplify code. No functionality change.	2013-06-01 11:26:39 +00:00
APSInt.cpp
Atomic.cpp
BlockFrequency.cpp
BranchProbability.cpp
circular_raw_ostream.cpp
CMakeLists.txt	MC: Disassembled CFG reconstruction.	2013-05-24 01:07:04 +00:00
CommandLine.cpp	Better output for long help strings for command-line options.	2013-05-10 17:15:51 +00:00
Compression.cpp	Fixup for r180094: properly use MSan interface functions	2013-04-23 13:35:32 +00:00
ConstantRange.cpp
ConvertUTF.c
ConvertUTFWrapper.cpp
COPYRIGHT.regex
CrashRecoveryContext.cpp
DAGDeltaAlgorithm.cpp
DataExtractor.cpp
DataStream.cpp
Debug.cpp
DeltaAlgorithm.cpp
Disassembler.cpp
Dwarf.cpp
DynamicLibrary.cpp
Errno.cpp
ErrorHandling.cpp
FileOutputBuffer.cpp
FileUtilities.cpp
FoldingSet.cpp
FormattedStream.cpp	Add line tracking support to FormattedStream	2013-05-08 20:29:10 +00:00
GraphWriter.cpp
Hashing.cpp
Host.cpp	Allow host triple to be correctly overridden in CMake builds	2013-05-04 07:36:23 +00:00
IncludeFile.cpp
IntEqClasses.cpp
IntervalMap.cpp
IntrusiveRefCntPtr.cpp
IsInf.cpp
IsNAN.cpp
LLVMBuild.txt
Locale.cpp
LocaleGeneric.inc
LocaleWindows.inc
LocaleXlocale.inc
LockFileManager.cpp
Makefile
ManagedStatic.cpp
MD5.cpp	Add support for adding the contents of a StringRef to the MD5 hash.	2013-05-31 22:34:56 +00:00
Memory.cpp
MemoryBuffer.cpp
MemoryObject.cpp	Remove the Copied parameter from MemoryObject::readBytes.	2013-05-24 10:54:58 +00:00
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	Use only explicit bool conversion operators	2013-05-15 07:36:59 +00:00
Statistic.cpp
StreamableMemoryObject.cpp	Remove the Copied parameter from MemoryObject::readBytes.	2013-05-24 10:54:58 +00:00
StringExtras.cpp
StringMap.cpp
StringPool.cpp
StringRef.cpp
StringRefMemoryObject.cpp	Remove the Copied parameter from MemoryObject::readBytes.	2013-05-24 10:54:58 +00:00
system_error.cpp
SystemUtils.cpp
TargetRegistry.cpp
Threading.cpp
ThreadLocal.cpp
Timer.cpp
TimeValue.cpp
ToolOutputFile.cpp
Triple.cpp	Recognize sparc64 as an alias for sparcv9 triples.	2013-05-14 17:47:27 +00:00
Twine.cpp
Valgrind.cpp
Watchdog.cpp
YAMLParser.cpp	Add ArrayRef constructor from None, and do the cleanups that this constructor enables	2013-05-05 00:40:33 +00:00
YAMLTraits.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