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History

Nick Kledzik c1a589d12a Fix memory leak in YAML I/O. Stop using BumpPtrAllocator for HNodes because they have fields (vector, map) which require HNode destructors to be run. llvm-svn: 171896		2013-01-08 21:04:44 +00:00
..
Unix	Eric thought that Darwin was right to use -1 consistently rather than	2013-01-05 00:42:50 +00:00
Windows	Fix an obvious typo spotted by Reid Kleckner, and breaking windows builds.	2013-01-04 23:46:04 +00:00
Allocator.cpp
APFloat.cpp	Implement APFloat::isDenormal()	2013-01-07 18:59:35 +00:00
APInt.cpp
APSInt.cpp
Atomic.cpp
BlockFrequency.cpp
BranchProbability.cpp
circular_raw_ostream.cpp
CMakeLists.txt
CommandLine.cpp
ConstantRange.cpp	Move all of the header files which are involved in modelling the LLVM IR	2013-01-02 11:36:10 +00:00
COPYRIGHT.regex
CrashRecoveryContext.cpp
DAGDeltaAlgorithm.cpp
DataExtractor.cpp
DataStream.cpp
Debug.cpp
DeltaAlgorithm.cpp	Split changeset_ty using iterators instead of loops.	2013-01-08 01:08:52 +00:00
Disassembler.cpp
Dwarf.cpp	Remove the llvm-local DW_TAG_vector_type tag and add a test to	2013-01-08 01:53:52 +00:00
DynamicLibrary.cpp
Errno.cpp
ErrorHandling.cpp
FileOutputBuffer.cpp
FileUtilities.cpp
FoldingSet.cpp	Fix whitespace. No functionality change.	2012-12-25 06:13:25 +00:00
FormattedStream.cpp
GraphWriter.cpp
Hashing.cpp
Host.cpp	Define getHostCPUFeatures for ARM Linux platform	2012-12-13 02:40:20 +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
Memory.cpp
MemoryBuffer.cpp	Go ahead and get rid of the old page size interface and convert all the	2012-12-31 23:31:56 +00:00
MemoryObject.cpp
Mutex.cpp
Path.cpp	Remove duplicate includes.	2012-12-21 17:06:44 +00:00
PathV2.cpp
PluginLoader.cpp
PrettyStackTrace.cpp
Process.cpp	Add time getters to the process interface for requesting the elapsed	2013-01-04 23:19:55 +00:00
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	Change SMRange to be half-open (exclusive end) instead of closed (inclusive)	2013-01-07 19:00:49 +00:00
Statistic.cpp
StreamableMemoryObject.cpp
StringExtras.cpp
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
Valgrind.cpp
YAMLParser.cpp
YAMLTraits.cpp	Fix memory leak in YAML I/O.	2013-01-08 21:04:44 +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