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Incremental LTO will usea cache to store object files. This patch handles the pruning part of the cache, exposing a few knobs: - Pruning interval: the implementation keeps a "timestamp" file in the directory and will scan it only after a given interval since the last modification of the timestamp file. This is for performance purpose, we don't want to scan continuously the folder. - Entry expiration: this is the time after which a file that hasn't been used is remove from the cache. - Maximum size: expressed in percentage of the available disk space, it helps to avoid that we blow up the disk space. http://reviews.llvm.org/D18422 From: Mehdi Amini <mehdi.amini@apple.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265209 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 | ||
circular_raw_ostream.cpp | ||
CMakeLists.txt | ||
COM.cpp | ||
CommandLine.cpp | ||
Compression.cpp | ||
ConvertUTF.c | ||
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 | ||
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 | ||
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 | ||
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