llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-03 14:08:57 +00:00

History

Yaron Keren af34c3a995 Fix llvm::huge_valf multiple initializations with Visual C++. llvm::huge_valf is defined in a header file, so it is initialized multiple times in every compiled unit upon program startup. With non-VC compilers huge_valf is set to a HUGE_VALF which the compiler can probably optimize out. With VC numeric_limits<float>::infinity() does not return a number but a runtime structure member which therotically may change between calls so the compiler does not optimize out the initialization and it happens many times. It can be easily seen by placing a breakpoint on the initialization line. This patch moves llvm::huge_valf initialization to a source file instead of the header. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218567 91177308-0d34-0410-b5e6-96231b3b80d8		2014-09-27 14:41:29 +00:00
..
Unix	Adding #ifdef around TermColorMutex based on feedback from Craig Topper.	2014-09-24 18:35:58 +00:00
Windows	clang-format of ChangeStdinToBinary & ChangeStdoutToBinary.	2014-09-26 22:27:11 +00:00
Allocator.cpp
APFloat.cpp	Check whether the iterator p == the end iterator before trying to dereference it. This is a speculative fix for a failure found on the valgrind buildbot triggered by a clang test.	2014-09-06 01:16:42 +00:00
APInt.cpp	typo	2014-09-11 15:41:01 +00:00
APSInt.cpp
ARMBuildAttrs.cpp
ARMWinEH.cpp
Atomic.cpp
BlockFrequency.cpp
BranchProbability.cpp
circular_raw_ostream.cpp
CMakeLists.txt	Fix llvm::huge_valf multiple initializations with Visual C++.	2014-09-27 14:41:29 +00:00
CommandLine.cpp	Fix PR17239 by changing the semantics of the RemainingArgsClass Option kind	2014-08-22 19:29:17 +00:00
Compression.cpp
ConvertUTF.c
ConvertUTFWrapper.cpp
COPYRIGHT.regex
CrashRecoveryContext.cpp
DAGDeltaAlgorithm.cpp
DataExtractor.cpp
DataStream.cpp
Debug.cpp	Removing static initializer from Debug.cpp by converting to a ManagedStatic.	2014-09-03 17:50:14 +00:00
DeltaAlgorithm.cpp
Dwarf.cpp	Reapply "[dwarfdump] Add missing DW_LANG_Mips_Assembler case to LanguageString()"	2014-09-05 07:21:40 +00:00
DynamicLibrary.cpp	Revert "Limit the symbol search in DynamicLibrary to the module that was opened."	2014-08-27 17:51:43 +00:00
Errno.cpp
ErrorHandling.cpp
FileOutputBuffer.cpp	unique_ptrify FileOutputBuffer::FileOutputBuffer	2014-09-02 17:49:23 +00:00
FileUtilities.cpp
FoldingSet.cpp
FormattedStream.cpp
GraphWriter.cpp
Hashing.cpp
Host.cpp
IntEqClasses.cpp
IntervalMap.cpp
IntrusiveRefCntPtr.cpp
IsInf.cpp
IsNAN.cpp
LEB128.cpp
LineIterator.cpp	LineIterator: Provide a variant that keeps blank lines	2014-09-17 15:43:01 +00:00
LLVMBuild.txt
Locale.cpp
LockFileManager.cpp	Misc cleanups to the FileSytem api.	2014-09-11 20:30:02 +00:00
Makefile
ManagedStatic.cpp
MathExtras.cpp	Fix llvm::huge_valf multiple initializations with Visual C++.	2014-09-27 14:41:29 +00:00
MD5.cpp	Simplify creation of a bunch of ArrayRefs by using None, makeArrayRef or just letting them be implicitly created.	2014-08-27 05:25:25 +00:00
Memory.cpp
MemoryBuffer.cpp	Return a std::unique_ptr when creating a new MemoryBuffer.	2014-08-27 20:03:13 +00:00
MemoryObject.cpp
Mutex.cpp
Path.cpp	Fix identify_magic() with mach-o stub dylibs.	2014-09-17 00:53:44 +00:00
PluginLoader.cpp
PrettyStackTrace.cpp
Process.cpp
Program.cpp
RandomNumberGenerator.cpp
raw_os_ostream.cpp
raw_ostream.cpp	Support: Remove undefined behavior from &raw_ostream::operator<<	2014-09-26 02:48:14 +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
ScaledNumber.cpp	Fix undefined behavior (left shift by 64 bits) in ScaledNumber::toString().	2014-08-20 18:30:07 +00:00
SearchForAddressOfSpecialSymbol.cpp
Signals.cpp
SmallPtrSet.cpp	Fix an off by 1 bug that prevented SmallPtrSet from using all of its 'small' capacity. Then fix the early return in the move constructor that prevented 'small' moves from clearing the NumElements in the moved from object. The directed test missed this because it was always testing large moves due to the off by 1 bug.	2014-08-20 04:41:36 +00:00
SmallVector.cpp
SourceMgr.cpp	Explicitly pass ownership of the MemoryBuffer to AddNewSourceBuffer using std::unique_ptr	2014-08-21 20:44:56 +00:00
SpecialCaseList.cpp	unique_ptrify the result of SpecialCaseList::create	2014-09-02 18:13:54 +00:00
Statistic.cpp
StreamableMemoryObject.cpp
StringExtras.cpp
StringMap.cpp
StringPool.cpp
StringRef.cpp	Simplify creation of a bunch of ArrayRefs by using None, makeArrayRef or just letting them be implicitly created.	2014-08-27 05:25:25 +00:00
StringRefMemoryObject.cpp
SystemUtils.cpp
TargetRegistry.cpp
Threading.cpp
ThreadLocal.cpp
Timer.cpp	Modernize raw_fd_ostream's constructor a bit.	2014-08-25 18:16:47 +00:00
TimeValue.cpp	Cleaning up static initializers in TimeValue.	2014-08-29 01:05:12 +00:00
ToolOutputFile.cpp	Modernize raw_fd_ostream's constructor a bit.	2014-08-25 18:16:47 +00:00
Triple.cpp	Add hsail and amdil64 to Triple	2014-09-19 19:52:11 +00:00
Twine.cpp
Unicode.cpp
Valgrind.cpp
Watchdog.cpp
YAMLParser.cpp	Fix some cases where StringRef was being passed by const reference. Remove const from some other StringRefs since its implicitly const already.	2014-08-30 16:48:02 +00:00
YAMLTraits.cpp	Fix memory leak in error paths in YAMLTraits by using unique_ptr	2014-09-15 18:39:24 +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