| //===-- MachOPlatform.h - Utilities for executing MachO in Orc --*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Utilities for executing JIT'd MachO in Orc. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_EXECUTIONENGINE_ORC_MACHOPLATFORM_H |
| #define LLVM_EXECUTIONENGINE_ORC_MACHOPLATFORM_H |
| |
| #include "llvm/ADT/StringRef.h" |
| #include "llvm/ExecutionEngine/Orc/Core.h" |
| #include "llvm/ExecutionEngine/Orc/ExecutorProcessControl.h" |
| #include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h" |
| #include "llvm/ExecutionEngine/Orc/Shared/ExecutorAddress.h" |
| |
| #include <future> |
| #include <thread> |
| #include <vector> |
| |
| namespace llvm { |
| namespace orc { |
| |
| /// Mediates between MachO initialization and ExecutionSession state. |
| class MachOPlatform : public Platform { |
| public: |
| // Used internally by MachOPlatform, but made public to enable serialization. |
| struct MachOJITDylibDepInfo { |
| bool Sealed = false; |
| std::vector<ExecutorAddr> DepHeaders; |
| }; |
| |
| // Used internally by MachOPlatform, but made public to enable serialization. |
| using MachOJITDylibDepInfoMap = |
| std::vector<std::pair<ExecutorAddr, MachOJITDylibDepInfo>>; |
| |
| /// Try to create a MachOPlatform instance, adding the ORC runtime to the |
| /// given JITDylib. |
| /// |
| /// The ORC runtime requires access to a number of symbols in libc++, and |
| /// requires access to symbols in libobjc, and libswiftCore to support |
| /// Objective-C and Swift code. It is up to the caller to ensure that the |
| /// requried symbols can be referenced by code added to PlatformJD. The |
| /// standard way to achieve this is to first attach dynamic library search |
| /// generators for either the given process, or for the specific required |
| /// libraries, to PlatformJD, then to create the platform instance: |
| /// |
| /// \code{.cpp} |
| /// auto &PlatformJD = ES.createBareJITDylib("stdlib"); |
| /// PlatformJD.addGenerator( |
| /// ExitOnErr(EPCDynamicLibrarySearchGenerator |
| /// ::GetForTargetProcess(EPC))); |
| /// ES.setPlatform( |
| /// ExitOnErr(MachOPlatform::Create(ES, ObjLayer, EPC, PlatformJD, |
| /// "/path/to/orc/runtime"))); |
| /// \endcode |
| /// |
| /// Alternatively, these symbols could be added to another JITDylib that |
| /// PlatformJD links against. |
| /// |
| /// Clients are also responsible for ensuring that any JIT'd code that |
| /// depends on runtime functions (including any code using TLV or static |
| /// destructors) can reference the runtime symbols. This is usually achieved |
| /// by linking any JITDylibs containing regular code against |
| /// PlatformJD. |
| /// |
| /// By default, MachOPlatform will add the set of aliases returned by the |
| /// standardPlatformAliases function. This includes both required aliases |
| /// (e.g. __cxa_atexit -> __orc_rt_macho_cxa_atexit for static destructor |
| /// support), and optional aliases that provide JIT versions of common |
| /// functions (e.g. dlopen -> __orc_rt_macho_jit_dlopen). Clients can |
| /// override these defaults by passing a non-None value for the |
| /// RuntimeAliases function, in which case the client is responsible for |
| /// setting up all aliases (including the required ones). |
| static Expected<std::unique_ptr<MachOPlatform>> |
| Create(ExecutionSession &ES, ObjectLinkingLayer &ObjLinkingLayer, |
| JITDylib &PlatformJD, const char *OrcRuntimePath, |
| Optional<SymbolAliasMap> RuntimeAliases = None); |
| |
| ExecutionSession &getExecutionSession() const { return ES; } |
| ObjectLinkingLayer &getObjectLinkingLayer() const { return ObjLinkingLayer; } |
| |
| Error setupJITDylib(JITDylib &JD) override; |
| Error teardownJITDylib(JITDylib &JD) override; |
| Error notifyAdding(ResourceTracker &RT, |
| const MaterializationUnit &MU) override; |
| Error notifyRemoving(ResourceTracker &RT) override; |
| |
| /// Returns an AliasMap containing the default aliases for the MachOPlatform. |
| /// This can be modified by clients when constructing the platform to add |
| /// or remove aliases. |
| static SymbolAliasMap standardPlatformAliases(ExecutionSession &ES); |
| |
| /// Returns the array of required CXX aliases. |
| static ArrayRef<std::pair<const char *, const char *>> requiredCXXAliases(); |
| |
| /// Returns the array of standard runtime utility aliases for MachO. |
| static ArrayRef<std::pair<const char *, const char *>> |
| standardRuntimeUtilityAliases(); |
| |
| /// Returns true if the given section name is an initializer section. |
| static bool isInitializerSection(StringRef SegName, StringRef SectName); |
| |
| private: |
| // The MachOPlatformPlugin scans/modifies LinkGraphs to support MachO |
| // platform features including initializers, exceptions, TLV, and language |
| // runtime registration. |
| class MachOPlatformPlugin : public ObjectLinkingLayer::Plugin { |
| public: |
| MachOPlatformPlugin(MachOPlatform &MP) : MP(MP) {} |
| |
| void modifyPassConfig(MaterializationResponsibility &MR, |
| jitlink::LinkGraph &G, |
| jitlink::PassConfiguration &Config) override; |
| |
| SyntheticSymbolDependenciesMap |
| getSyntheticSymbolDependencies(MaterializationResponsibility &MR) override; |
| |
| // FIXME: We should be tentatively tracking scraped sections and discarding |
| // if the MR fails. |
| Error notifyFailed(MaterializationResponsibility &MR) override { |
| return Error::success(); |
| } |
| |
| Error notifyRemovingResources(ResourceKey K) override { |
| return Error::success(); |
| } |
| |
| void notifyTransferringResources(ResourceKey DstKey, |
| ResourceKey SrcKey) override {} |
| |
| private: |
| using InitSymbolDepMap = |
| DenseMap<MaterializationResponsibility *, JITLinkSymbolSet>; |
| |
| void addEHAndTLVSupportPasses(MaterializationResponsibility &MR, |
| jitlink::PassConfiguration &Config); |
| |
| Error associateJITDylibHeaderSymbol(jitlink::LinkGraph &G, |
| MaterializationResponsibility &MR); |
| |
| Error preserveInitSections(jitlink::LinkGraph &G, |
| MaterializationResponsibility &MR); |
| |
| Error processObjCImageInfo(jitlink::LinkGraph &G, |
| MaterializationResponsibility &MR); |
| |
| Error fixTLVSectionsAndEdges(jitlink::LinkGraph &G, JITDylib &JD); |
| |
| Error registerObjectPlatformSections(jitlink::LinkGraph &G, JITDylib &JD); |
| |
| Error registerEHSectionsPhase1(jitlink::LinkGraph &G); |
| |
| std::mutex PluginMutex; |
| MachOPlatform &MP; |
| |
| // FIXME: ObjCImageInfos and HeaderAddrs need to be cleared when |
| // JITDylibs are removed. |
| DenseMap<JITDylib *, std::pair<uint32_t, uint32_t>> ObjCImageInfos; |
| DenseMap<JITDylib *, ExecutorAddr> HeaderAddrs; |
| InitSymbolDepMap InitSymbolDeps; |
| }; |
| |
| using GetJITDylibHeaderSendResultFn = |
| unique_function<void(Expected<ExecutorAddr>)>; |
| using GetJITDylibNameSendResultFn = |
| unique_function<void(Expected<StringRef>)>; |
| using PushInitializersSendResultFn = |
| unique_function<void(Expected<MachOJITDylibDepInfoMap>)>; |
| using SendSymbolAddressFn = unique_function<void(Expected<ExecutorAddr>)>; |
| |
| static bool supportedTarget(const Triple &TT); |
| |
| MachOPlatform(ExecutionSession &ES, ObjectLinkingLayer &ObjLinkingLayer, |
| JITDylib &PlatformJD, |
| std::unique_ptr<DefinitionGenerator> OrcRuntimeGenerator, |
| Error &Err); |
| |
| // Associate MachOPlatform JIT-side runtime support functions with handlers. |
| Error associateRuntimeSupportFunctions(JITDylib &PlatformJD); |
| |
| // Implements rt_pushInitializers by making repeat async lookups for |
| // initializer symbols (each lookup may spawn more initializer symbols if |
| // it pulls in new materializers, e.g. from objects in a static library). |
| void pushInitializersLoop(PushInitializersSendResultFn SendResult, |
| JITDylibSP JD); |
| |
| // Handle requests from the ORC runtime to push MachO initializer info. |
| void rt_pushInitializers(PushInitializersSendResultFn SendResult, |
| ExecutorAddr JDHeaderAddr); |
| |
| // Handle requests for symbol addresses from the ORC runtime. |
| void rt_lookupSymbol(SendSymbolAddressFn SendResult, ExecutorAddr Handle, |
| StringRef SymbolName); |
| |
| // Records the addresses of runtime symbols used by the platform. |
| Error bootstrapMachORuntime(JITDylib &PlatformJD); |
| |
| // Call the ORC runtime to create a pthread key. |
| Expected<uint64_t> createPThreadKey(); |
| |
| enum PlatformState { BootstrapPhase1, BootstrapPhase2, Initialized }; |
| |
| ExecutionSession &ES; |
| ObjectLinkingLayer &ObjLinkingLayer; |
| |
| SymbolStringPtr MachOHeaderStartSymbol; |
| std::atomic<PlatformState> State{BootstrapPhase1}; |
| |
| ExecutorAddr orc_rt_macho_platform_bootstrap; |
| ExecutorAddr orc_rt_macho_platform_shutdown; |
| ExecutorAddr orc_rt_macho_register_ehframe_section; |
| ExecutorAddr orc_rt_macho_deregister_ehframe_section; |
| ExecutorAddr orc_rt_macho_register_jitdylib; |
| ExecutorAddr orc_rt_macho_deregister_jitdylib; |
| ExecutorAddr orc_rt_macho_register_object_platform_sections; |
| ExecutorAddr orc_rt_macho_deregister_object_platform_sections; |
| ExecutorAddr orc_rt_macho_create_pthread_key; |
| |
| DenseMap<JITDylib *, SymbolLookupSet> RegisteredInitSymbols; |
| |
| std::mutex PlatformMutex; |
| DenseMap<JITDylib *, ExecutorAddr> JITDylibToHeaderAddr; |
| DenseMap<ExecutorAddr, JITDylib *> HeaderAddrToJITDylib; |
| DenseMap<JITDylib *, uint64_t> JITDylibToPThreadKey; |
| }; |
| |
| namespace shared { |
| |
| using SPSNamedExecutorAddrRangeSequence = |
| SPSSequence<SPSTuple<SPSString, SPSExecutorAddrRange>>; |
| |
| } // end namespace shared |
| } // end namespace orc |
| } // end namespace llvm |
| |
| #endif // LLVM_EXECUTIONENGINE_ORC_MACHOPLATFORM_H |