Lang Hames a020f7f14c [ORC][ORC-RT] Introduce ORC-runtime based MachO-Platform. ... Adds support for MachO static initializers/deinitializers and eh-frame registration via the ORC runtime. This commit introduces cooperative support code into the ORC runtime and ORC LLVM libraries (especially the MachOPlatform class) to support macho runtime features for JIT'd code. This commit introduces support for static initializers, static destructors (via cxa_atexit interposition), and eh-frame registration. Near-future commits will add support for MachO native thread-local variables, and language runtime registration (e.g. for Objective-C and Swift). The llvm-jitlink tool is updated to use the ORC runtime where available, and regression tests for the new MachOPlatform support are added to compiler-rt. Notable changes on the ORC runtime side: 1. The new macho_platform.h / macho_platform.cpp files contain the bulk of the runtime-side support. This includes eh-frame registration; jit versions of dlopen, dlsym, and dlclose; a cxa_atexit interpose to record static destructors, and an '__orc_rt_macho_run_program' function that defines running a JIT'd MachO program in terms of the jit- dlopen/dlsym/dlclose functions. 2. Replaces JITTargetAddress (and casting operations) with ExecutorAddress (copied from LLVM) to improve type-safety of address management. 3. Adds serialization support for ExecutorAddress and unordered_map types to the runtime-side Simple Packed Serialization code. 4. Adds orc-runtime regression tests to ensure that static initializers and cxa-atexit interposes work as expected. Notable changes on the LLVM side: 1. The MachOPlatform class is updated to: 1.1. Load the ORC runtime into the ExecutionSession. 1.2. Set up standard aliases for macho-specific runtime functions. E.g. ___cxa_atexit -> ___orc_rt_macho_cxa_atexit. 1.3. Install the MachOPlatformPlugin to scrape LinkGraphs for information needed to support MachO features (e.g. eh-frames, mod-inits), and communicate this information to the runtime. 1.4. Provide entry-points that the runtime can call to request initializers, perform symbol lookup, and request deinitialiers (the latter is implemented as an empty placeholder as macho object deinits are rarely used). 1.5. Create a MachO header object for each JITDylib (defining the __mh_header and __dso_handle symbols). 2. The llvm-jitlink tool (and llvm-jitlink-executor) are updated to use the runtime when available. 3. A `lookupInitSymbolsAsync` method is added to the Platform base class. This can be used to issue an async lookup for initializer symbols. The existing `lookupInitSymbols` method is retained (the GenericIRPlatform code is still using it), but is deprecated and will be removed soon. 4. JIT-dispatch support code is added to ExecutorProcessControl. The JIT-dispatch system allows handlers in the JIT process to be associated with 'tag' symbols in the executor, and allows the executor to make remote procedure calls back to the JIT process (via __orc_rt_jit_dispatch) using those tags. The primary use case is ORC runtime code that needs to call bakc to handlers in orc::Platform subclasses. E.g. __orc_rt_macho_jit_dlopen calling back to MachOPlatform::rt_getInitializers using __orc_rt_macho_get_initializers_tag. (The system is generic however, and could be used by non-runtime code). The new ExecutorProcessControl::JITDispatchInfo struct provides the address (in the executor) of the jit-dispatch function and a jit-dispatch context object, and implementations of the dispatch function are added to SelfExecutorProcessControl and OrcRPCExecutorProcessControl. 5. OrcRPCTPCServer is updated to support JIT-dispatch calls over ORC-RPC. 6. Serialization support for StringMap is added to the LLVM-side Simple Packed Serialization code. 7. A JITLink::allocateBuffer operation is introduced to allocate writable memory attached to the graph. This is used by the MachO header synthesis code, and will be generically useful for other clients who want to create new graph content from scratch.		2021-07-19 19:50:16 +10:00
..
JITLink	[JITLink] Suppress expect-death test in release mode.	2021-05-24 22:57:10 -07:00
MCJIT
Orc	[ORC][ORC-RT] Introduce ORC-runtime based MachO-Platform.	2021-07-19 19:50:16 +10:00
CMakeLists.txt
ExecutionEngineTest.cpp