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Summary: std::chrono mostly covers the functionality of llvm::sys::TimeValue and lldb_private::TimeValue. This header adds a bit of utility functions and typedefs, which make the usage of the library and porting code from TimeValues easier. Rationale: - TimePoint typedef - precision of system_clock is implementation defined - using a well-defined precision helps maintain consistency between platforms, makes it interact better with existing TimeValue classes, and avoids cases there a time point is implicitly convertible to a specific precision on some platforms but not on others. - system_clock::to_time_t only accepts time_points with the default system precision (even though time_t has only second precision on all platforms we support). To avoid the need for explicit casts, I have added a toTimeT() wrapper function. toTimePoint(time_t) was not strictly necessary, but I have added it for symmetry. Reviewers: zturner, mehdi_amini Subscribers: beanz, mgorny, llvm-commits, modocache Differential Revision: https://reviews.llvm.org/D25416 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284590 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| .. | ||
| Unix | ||
| Windows | ||
| Allocator.cpp | ||
| APFloat.cpp | ||
| APInt.cpp | ||
| APSInt.cpp | ||
| ARMBuildAttrs.cpp | ||
| ARMWinEH.cpp | ||
| Atomic.cpp | ||
| BlockFrequency.cpp | ||
| BranchProbability.cpp | ||
| CachePruning.cpp | ||
| Chrono.cpp | ||
| circular_raw_ostream.cpp | ||
| CMakeLists.txt | ||
| COM.cpp | ||
| CommandLine.cpp | ||
| Compression.cpp | ||
| ConvertUTF.cpp | ||
| ConvertUTFWrapper.cpp | ||
| COPYRIGHT.regex | ||
| CrashRecoveryContext.cpp | ||
| DAGDeltaAlgorithm.cpp | ||
| DataExtractor.cpp | ||
| DataStream.cpp | ||
| Debug.cpp | ||
| DeltaAlgorithm.cpp | ||
| Dwarf.cpp | ||
| DynamicLibrary.cpp | ||
| Errno.cpp | ||
| Error.cpp | ||
| ErrorHandling.cpp | ||
| FileOutputBuffer.cpp | ||
| FileUtilities.cpp | ||
| FoldingSet.cpp | ||
| FormattedStream.cpp | ||
| GraphWriter.cpp | ||
| Hashing.cpp | ||
| Host.cpp | ||
| IntEqClasses.cpp | ||
| IntervalMap.cpp | ||
| IntrusiveRefCntPtr.cpp | ||
| JamCRC.cpp | ||
| LEB128.cpp | ||
| LineIterator.cpp | ||
| LLVMBuild.txt | ||
| Locale.cpp | ||
| LockFileManager.cpp | ||
| ManagedStatic.cpp | ||
| MathExtras.cpp | ||
| MD5.cpp | ||
| Memory.cpp | ||
| MemoryBuffer.cpp | ||
| MemoryObject.cpp | ||
| Mutex.cpp | ||
| NativeFormatting.cpp | ||
| Options.cpp | ||
| Path.cpp | ||
| PluginLoader.cpp | ||
| PrettyStackTrace.cpp | ||
| Process.cpp | ||
| Program.cpp | ||
| RandomNumberGenerator.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 | ||
| ScaledNumber.cpp | ||
| ScopedPrinter.cpp | ||
| SearchForAddressOfSpecialSymbol.cpp | ||
| SHA1.cpp | ||
| Signals.cpp | ||
| SmallPtrSet.cpp | ||
| SmallVector.cpp | ||
| SourceMgr.cpp | ||
| SpecialCaseList.cpp | ||
| Statistic.cpp | ||
| StreamingMemoryObject.cpp | ||
| StringExtras.cpp | ||
| StringMap.cpp | ||
| StringPool.cpp | ||
| StringRef.cpp | ||
| StringSaver.cpp | ||
| SystemUtils.cpp | ||
| TargetParser.cpp | ||
| TargetRegistry.cpp | ||
| Threading.cpp | ||
| ThreadLocal.cpp | ||
| ThreadPool.cpp | ||
| Timer.cpp | ||
| TimeValue.cpp | ||
| ToolOutputFile.cpp | ||
| Triple.cpp | ||
| Twine.cpp | ||
| Unicode.cpp | ||
| Valgrind.cpp | ||
| Watchdog.cpp | ||
| xxhash.cpp | ||
| YAMLParser.cpp | ||
| YAMLTraits.cpp | ||
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