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History

Bob Wilson caefeeb04d Add Triple::getMacOSXVersion to replace crufty code in the clang driver. This new function provides a way to get the Mac OS X version number from either generic "darwin" triples of macosx triples. llvm-svn: 149438		2012-01-31 22:32:29 +00:00
..
Unix	Remove SetWorkingDirectory from the Process interface. Nothing in LLVM	2012-01-15 08:41:35 +00:00
Windows	Remove SetWorkingDirectory from the Process interface. Nothing in LLVM	2012-01-15 08:41:35 +00:00
Allocator.cpp
APFloat.cpp	Add 'llvm_unreachable' to passify GCC's understanding of the constraints	2012-01-10 18:08:01 +00:00
APInt.cpp	Add r149110 back with a fix for when the vector and the int have the same	2012-01-27 23:33:07 +00:00
APSInt.cpp
Atomic.cpp	drop unneeded config.h includes	2011-12-22 23:04:07 +00:00
BlockFrequency.cpp
BranchProbability.cpp
circular_raw_ostream.cpp
CMakeLists.txt	Move Clang's file-level locking facility over to LLVM's support	2012-01-29 20:15:10 +00:00
CommandLine.cpp	Tidy up. s/Low Level Virtual Machine/LLVM/.	2012-01-25 22:00:23 +00:00
ConstantRange.cpp	Conform to the style guide; remove 'else' after 'return'. Also remove an extra	2012-01-03 20:33:00 +00:00
COPYRIGHT.regex
CrashRecoveryContext.cpp
DAGDeltaAlgorithm.cpp	Adding missing anchor to DATDeltaAlgorithm.	2011-12-07 06:44:23 +00:00
DataExtractor.cpp
Debug.cpp
DeltaAlgorithm.cpp
Disassembler.cpp
Dwarf.cpp
DynamicLibrary.cpp
Errno.cpp
ErrorHandling.cpp
FileUtilities.cpp
FoldingSet.cpp
FormattedStream.cpp
GraphWriter.cpp
Host.cpp	Remove unreachable code. (replace with llvm_unreachable to help GCC where necessary)	2012-01-17 04:43:56 +00:00
IncludeFile.cpp
IntEqClasses.cpp
IntervalMap.cpp
IntrusiveRefCntPtr.cpp	Unweaken vtables as per http://llvm.org/docs/CodingStandards.html#ll_virtual_anch	2011-12-20 02:50:00 +00:00
IsInf.cpp
IsNAN.cpp
JSONParser.cpp	Removes template magic to build up containers.	2012-01-17 09:34:07 +00:00
LLVMBuild.txt	LLVMBuild: Remove trailing newline, which irked me.	2011-12-12 19:48:00 +00:00
LockFileManager.cpp	Move Clang's file-level locking facility over to LLVM's support	2012-01-29 20:15:10 +00:00
Makefile
ManagedStatic.cpp
Memory.cpp
MemoryBuffer.cpp
MemoryObject.cpp
Mutex.cpp	Remove dead code.	2012-01-15 01:09:13 +00:00
Path.cpp	Support/FileSystem: Add file_magic and move a vew clients over to it.	2011-12-13 23:17:12 +00:00
PathV2.cpp	Support/FileSystem: Add file_magic and move a vew clients over to it.	2011-12-13 23:17:12 +00:00
PluginLoader.cpp
PrettyStackTrace.cpp
Process.cpp
Program.cpp	Support/Program: Make Change<stream>ToBinary return error_code.	2011-12-13 23:16:49 +00:00
raw_os_ostream.cpp
raw_ostream.cpp	Support/Program: Make Change<stream>ToBinary return error_code.	2011-12-13 23:16:49 +00:00
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	Remove dead code.	2012-01-15 01:09:13 +00:00
SearchForAddressOfSpecialSymbol.cpp
Signals.cpp
SmallPtrSet.cpp
SmallVector.cpp
SourceMgr.cpp	Removing unused default switch cases in switches over enums that already account for all enumeration values explicitly.	2012-01-16 23:24:27 +00:00
Statistic.cpp	Silence tsan false-positives (tsan can't track things which are only safe due to	2011-12-05 23:07:05 +00:00
StringExtras.cpp
StringMap.cpp	Switch StringMap from an array of structures to a structure of arrays.	2011-12-27 20:35:07 +00:00
StringPool.cpp
StringRef.cpp
system_error.cpp
SystemUtils.cpp
TargetRegistry.cpp	revert r147542 after comments from Joerg Sonnenberger	2012-01-05 18:28:46 +00:00
Threading.cpp	rename ENABLE_THREADS to LLVM_ENABLE_THREADS	2011-11-28 00:48:58 +00:00
ThreadLocal.cpp	rename ENABLE_THREADS to LLVM_ENABLE_THREADS	2011-11-28 00:48:58 +00:00
Timer.cpp
TimeValue.cpp
ToolOutputFile.cpp
Triple.cpp	Add Triple::getMacOSXVersion to replace crufty code in the clang driver.	2012-01-31 22:32:29 +00:00
Twine.cpp
Valgrind.cpp	Don't define these unless we plan to use them.	2011-11-28 22:14:02 +00:00

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