llvm-project/llvm/lib/Support
Dimitry Andric ebc8779301 Revert r303015, because it has the unintended side effect of breaking
driver-mode recognition in clang (this is because the sysctl method
always returns one and only one executable path, even for an executable
with multiple links):

Fix DynamicLibraryTest.cpp on FreeBSD and NetBSD

Summary:

After rL301562, on FreeBSD the DynamicLibrary unittests fail, because
the test uses getMainExecutable("DynamicLibraryTests", Ptr), and since
the path does not contain any slashes, retrieving the main executable
will not work.

Reimplement getMainExecutable() for FreeBSD and NetBSD using sysctl(3),
which is more reliable than fiddling with relative or absolute paths.

Also add retrieval of the original argv[] from the GoogleTest framework,
to use as a fallback for other OSes.

Reviewers: emaste, marsupial, hans, krytarowski

Reviewed By: krytarowski

Subscribers: krytarowski, llvm-commits

Differential Revision: https://reviews.llvm.org/D33171

llvm-svn: 303285
2017-05-17 19:33:10 +00:00
..
Unix Revert r303015, because it has the unintended side effect of breaking 2017-05-17 19:33:10 +00:00
Windows Refactor DynamicLibrary so searching for a symbol will have a defined order and 2017-04-27 16:55:24 +00:00
APFloat.cpp [AsmWriter/APFloat] FP constant printing: Avoid usage of locale dependent snprinf 2017-04-21 02:52:17 +00:00
APInt.cpp [APInt] Simplify a for loop initialization based on the fact that 'n' is known to be 1 by an earlier 'if'. 2017-05-15 22:01:03 +00:00
APSInt.cpp
ARMAttributeParser.cpp [ARM] Create objdump subtarget from build attrs 2017-01-18 13:52:12 +00:00
ARMBuildAttrs.cpp Use StringRef instead of raw pointers in ARMBuildAttrs (NFC) 2016-10-05 00:15:18 +00:00
ARMWinEH.cpp
Allocator.cpp
Atomic.cpp Remove all of the legacy home-grown atomic operations LLVM provided 2016-06-02 17:11:11 +00:00
BinaryStreamError.cpp [Support] Move Stream library from MSF -> Support. 2017-03-02 20:52:51 +00:00
BinaryStreamReader.cpp Resubmit r301986 and r301987 "Add codeview::StringTable" 2017-05-03 15:58:37 +00:00
BinaryStreamWriter.cpp Resubmit r301986 and r301987 "Add codeview::StringTable" 2017-05-03 15:58:37 +00:00
BlockFrequency.cpp
BranchProbability.cpp Cleanup dump() functions. 2017-01-28 02:02:38 +00:00
CMakeLists.txt [Support] Move Parallel algorithms from LLD to LLVM. 2017-05-11 00:03:52 +00:00
COM.cpp
COPYRIGHT.regex
CachePruning.cpp Support, LTO: When pruning a directory, ignore files matching a prefix. 2017-03-20 16:41:57 +00:00
Chrono.cpp Make naming in Host.h in line with coding standards. 2017-03-31 13:06:40 +00:00
CommandLine.cpp Allow suppressing host and target info in VersionPrinter 2017-04-19 00:03:36 +00:00
Compression.cpp Recommit r292214 "[Support/Compression] - Change zlib API to return Error instead of custom status" 2017-01-17 15:45:07 +00:00
ConvertUTF.cpp Move UTF functions into namespace llvm. 2016-09-30 00:38:45 +00:00
ConvertUTFWrapper.cpp
CrashRecoveryContext.cpp Re-land r303274: "[CrashRecovery] Use SEH __try instead of VEH when available" 2017-05-17 18:16:17 +00:00
DAGDeltaAlgorithm.cpp
DataExtractor.cpp Make DWARFDebugLine use StringRef for directory/file tables. NFC 2017-05-02 17:37:32 +00:00
Debug.cpp Attempt to fix build bot after r290597 2016-12-27 10:24:58 +00:00
DebugCounter.cpp DebugCounter: Initialize skip to 0, not -1 2017-03-04 14:08:47 +00:00
DeltaAlgorithm.cpp Missing includes. 2016-09-14 08:55:18 +00:00
Dwarf.cpp [DWARF] Versioning for DWARF constants; verify FORMs 2017-04-20 19:16:51 +00:00
DynamicLibrary.cpp Refactor DynamicLibrary so searching for a symbol will have a defined order and 2017-04-27 16:55:24 +00:00
Errno.cpp
Error.cpp Fix a linefeed at eof. 2016-11-29 17:32:43 +00:00
ErrorHandling.cpp
FileOutputBuffer.cpp Make FileOutputBuffer fail early if you pass a directory. 2017-03-13 22:19:05 +00:00
FileUtilities.cpp Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes. 2016-08-23 17:14:32 +00:00
FoldingSet.cpp PR30711: Fix incorrect profiling of 'long long' in FoldingSet, then use it to 2016-10-16 17:49:09 +00:00
FormatVariadic.cpp [Support] Introduce llvm::formatv() function. 2016-11-11 23:57:40 +00:00
FormattedStream.cpp
GlobPattern.cpp Move GlobPattern class from LLD to llvm/Support. 2016-12-20 23:09:09 +00:00
GraphWriter.cpp
Hashing.cpp
Host.cpp [X86][LWP] Add llvm support for LWP instructions (reapplied). 2017-05-03 15:51:39 +00:00
IntEqClasses.cpp
IntervalMap.cpp
JamCRC.cpp
LEB128.cpp
LLVMBuild.txt Add an c++ itanium demangler to llvm. 2016-09-06 19:16:48 +00:00
LineIterator.cpp
Locale.cpp
LockFileManager.cpp [LockFileManager] Reduce lock timeout 2017-03-18 00:32:34 +00:00
LowLevelType.cpp [GlobalISel] Support vector-of-pointers in LLT 2017-04-19 07:23:57 +00:00
MD5.cpp Add a function to MD5 a file's contents. 2017-03-20 23:33:18 +00:00
ManagedStatic.cpp Revamp llvm::once_flag to be closer to std::once_flag 2017-02-05 21:13:06 +00:00
MathExtras.cpp
Memory.cpp
MemoryBuffer.cpp [Support] Add a function to check if a file resides locally. 2017-02-21 20:55:47 +00:00
Mutex.cpp
NativeFormatting.cpp Remove dead variable Len. 2017-01-04 19:47:10 +00:00
Options.cpp
Parallel.cpp Fix -DLLVM_ENABLE_THREADS=OFF build after r302748 2017-05-11 15:32:47 +00:00
Path.cpp Add a function to MD5 a file's contents. 2017-03-20 23:33:18 +00:00
PluginLoader.cpp
PrettyStackTrace.cpp Include <cstdio> in PrettyStackTrace.cpp, since it uses vsnprintf(3). 2017-04-29 23:45:30 +00:00
Process.cpp [Support] Creation of minidump after compiler crash on Windows 2016-05-04 16:56:51 +00:00
Program.cpp
README.txt.system
RWMutex.cpp [Support] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC). 2017-02-15 22:17:02 +00:00
RandomNumberGenerator.cpp [Support] Fix undefined behavior in RandomNumberGenerator. 2016-10-11 18:17:26 +00:00
Regex.cpp Add const to a const method. NFC 2017-04-18 01:04:05 +00:00
SHA1.cpp Fix builbots. 2016-11-23 03:58:12 +00:00
ScaledNumber.cpp Replace APFloatBase static fltSemantics data members with getter functions 2016-12-14 11:57:17 +00:00
ScopedPrinter.cpp [llvm-pdbdump] Allow printing only a portion of a stream. 2017-04-28 00:43:38 +00:00
Signals.cpp Remove name space pollution from Signals.cpp 2017-03-31 14:58:52 +00:00
SmallPtrSet.cpp [SmallPtrSet] Introduce a find primitive and rewrite count/erase in terms of it 2016-12-31 02:33:22 +00:00
SmallVector.cpp
SourceMgr.cpp Remove unnecessary conditions as suggested by clang-tidy. NFC 2017-05-01 16:18:42 +00:00
SpecialCaseList.cpp Use trigrams to speed up SpecialCaseList. 2016-12-01 02:54:54 +00:00
Statistic.cpp Statistic/Timer: Include timers in PrintStatisticsJSON(). 2016-11-18 19:43:24 +00:00
StringExtras.cpp
StringMap.cpp Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes. 2016-08-23 17:14:32 +00:00
StringPool.cpp
StringRef.cpp [Support] Add StringRef::getAsDouble. 2017-02-14 19:06:37 +00:00
StringSaver.cpp Use StringRef in StringSaver API (NFC) 2016-10-05 01:32:41 +00:00
SystemUtils.cpp
TarWriter.cpp TarWriter: Fix a bug in Ustar header. 2017-01-09 22:55:00 +00:00
TargetParser.cpp [AArch64] Fix variable name ambiguity in r302078. 2017-05-03 20:51:34 +00:00
TargetRegistry.cpp Revert "Use StringRef instead of raw pointer in TargetRegistry API (NFC)" 2016-10-01 07:08:23 +00:00
ThreadLocal.cpp
ThreadPool.cpp [ThreadPool] Rollback recent changes until I figure out the breakage. 2016-11-28 09:17:12 +00:00
Threading.cpp Try to fix thread name truncation on non-Windows. 2017-03-04 18:53:09 +00:00
Timer.cpp Change default TimerGroup singleton to use magic statics 2017-02-16 20:19:49 +00:00
ToolOutputFile.cpp
TrigramIndex.cpp Support escaping in TrigramIndex. 2016-12-02 23:30:16 +00:00
Triple.cpp [Triple] Add a "macos" OS type that acts as a synonym for "macosx" 2017-05-03 10:42:35 +00:00
Twine.cpp Cleanup dump() functions. 2017-01-28 02:02:38 +00:00
Unicode.cpp
Valgrind.cpp
Watchdog.cpp
YAMLParser.cpp Improve error handling in YAML parsing 2016-11-28 21:38:52 +00:00
YAMLTraits.cpp [YAML] When outputting, provide the ability to write default values. 2017-03-15 17:47:39 +00:00
circular_raw_ostream.cpp
raw_os_ostream.cpp
raw_ostream.cpp Update comment for r299098 per feedback from James Henderson. 2017-03-31 12:08:45 +00:00
regcclass.h
regcname.h
regcomp.c
regengine.inc
regerror.c
regex2.h
regex_impl.h
regexec.c
regfree.c
regstrlcpy.c
regutils.h
xxhash.cpp Revert r301487: Replace HashString algorithm with xxHash64 2017-04-26 23:15:10 +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