Lang Hames 1f6601ec56 [ORC] Add new core ORC APIs (Core.h/Core.cpp): VSO, AsynchronousSymbolQuery and ... SymbolSource. These new APIs are a first stab at tackling some current shortcomings of ORC, especially in performance and threading support. VSO (Virtual Shared Object) is a symbol table representing the symbol definitions of a set of modules that behave as if they had been statically linked together into a shared object or dylib. Symbol definitions, either pre-defined addresses or lazy definitions, can be added and queries for symbol addresses made. The table applies the same linkage strength rules that static linkers do when constructing a dylib or shared object: duplicate definitions result in errors, strong definitions override weak or common ones. This class should improve symbol lookup speed by providing centralized symbol tables (as compared to the findSymbol implementation in the in-tree ORC layers, which maintain one symbol table per object file / module added). AsynchronousSymbolQuery is a query for the addresses of a set of symbols. Query results are returned via a callback once they become available. Querying for a set of symbols, rather than one symbol at a time (as the current lookup scheme does) the JIT has the opportunity to make better use of available resources (e.g. by spawning multiple jobs to materialize the requested symbols if possible). Returning results via a callback makes queries asynchronous, so queries from multiple threads of JIT'd code can proceed simultaneously. SymbolSource represents a source of symbol definitions. It is used when adding lazy symbol definitions to a VSO. Symbol definitions can be materialized when needed or discarded if a stronger definition is found. Materializing on demand via SymbolSources should (eventually) allow us to remove the lazy materializers from JITSymbol, which will in turn allow the removal of many current error checks and reduce the number of RPC round-trips involved in materializing remote symbols. Adding a discard function allows sources to discard symbol definitions (or mark them as available_externally), reducing the amount of redundant code generated by the JIT for ODR symbols. llvm-svn: 321838		2018-01-05 00:04:16 +00:00
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Orc	[ORC] Add new core ORC APIs (Core.h/Core.cpp): VSO, AsynchronousSymbolQuery and	2018-01-05 00:04:16 +00:00
ExecutionEngine.h	[ExecutionEngine] After a heroic dev-meeting hack session, the JIT supports TLS.	2017-10-20 00:53:16 +00:00
GenericValue.h	[ExecutionEngine] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC).	2017-06-19 23:37:52 +00:00
Interpreter.h	Remove useless hack that avoids calling LLVMLinkInInterpreter()	2015-12-07 22:27:19 +00:00
JITEventListener.h	[ExecutionEngine] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC).	2017-06-19 23:37:52 +00:00
JITSymbol.h	[ORC] Add new core ORC APIs (Core.h/Core.cpp): VSO, AsynchronousSymbolQuery and	2018-01-05 00:04:16 +00:00
MCJIT.h
ObjectCache.h	[ExecutionEngine] Fix some Clang-tidy modernize-use-default, modernize-use-equals-delete and Include What You Use warnings; other minor fixes.	2016-11-16 18:07:33 +00:00
ObjectMemoryBuffer.h	Use StringRef for MemoryBuffer identifier API (NFC)	2016-10-01 16:38:28 +00:00
OProfileWrapper.h
OrcMCJITReplacement.h
RTDyldMemoryManager.h	Make EHFrames available to sub-classes of RTDyldMemoryManager.	2017-07-18 15:50:28 +00:00
RuntimeDyld.h	DebugInfo: Generalize LoadedObjectInfoHelper from RuntimeDyld	2017-07-05 15:23:56 +00:00
RuntimeDyldChecker.h	Make llvm-rtdlyd -check preserve automatic address mappings made by RuntimeDyld.	2017-05-07 17:19:53 +00:00
SectionMemoryManager.h	[SectionMemoryManager] Abstract out mmap, munmap, mprotect even more ; NFC	2017-11-09 06:31:33 +00:00