| //===--------- EHFrameSupport.h - JITLink eh-frame utils --------*- 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // EHFrame registration support for JITLink. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORT_H |
| #define LLVM_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORT_H |
| |
| #include "llvm/ADT/Triple.h" |
| #include "llvm/ExecutionEngine/JITLink/JITLink.h" |
| #include "llvm/ExecutionEngine/JITSymbol.h" |
| #include "llvm/Support/Error.h" |
| |
| namespace llvm { |
| namespace jitlink { |
| |
| /// Registers all FDEs in the given eh-frame section with the current process. |
| Error registerEHFrameSection(const void *EHFrameSectionAddr, |
| size_t EHFrameSectionSize); |
| |
| /// Deregisters all FDEs in the given eh-frame section with the current process. |
| Error deregisterEHFrameSection(const void *EHFrameSectionAddr, |
| size_t EHFrameSectionSize); |
| |
| /// Supports registration/deregistration of EH-frames in a target process. |
| class EHFrameRegistrar { |
| public: |
| virtual ~EHFrameRegistrar(); |
| virtual Error registerEHFrames(JITTargetAddress EHFrameSectionAddr, |
| size_t EHFrameSectionSize) = 0; |
| virtual Error deregisterEHFrames(JITTargetAddress EHFrameSectionAddr, |
| size_t EHFrameSectionSize) = 0; |
| }; |
| |
| /// Registers / Deregisters EH-frames in the current process. |
| class InProcessEHFrameRegistrar final : public EHFrameRegistrar { |
| public: |
| /// Get a reference to the InProcessEHFrameRegistrar singleton. |
| static InProcessEHFrameRegistrar &getInstance(); |
| |
| InProcessEHFrameRegistrar(const InProcessEHFrameRegistrar &) = delete; |
| InProcessEHFrameRegistrar & |
| operator=(const InProcessEHFrameRegistrar &) = delete; |
| |
| InProcessEHFrameRegistrar(InProcessEHFrameRegistrar &&) = delete; |
| InProcessEHFrameRegistrar &operator=(InProcessEHFrameRegistrar &&) = delete; |
| |
| Error registerEHFrames(JITTargetAddress EHFrameSectionAddr, |
| size_t EHFrameSectionSize) override { |
| return registerEHFrameSection( |
| jitTargetAddressToPointer<void *>(EHFrameSectionAddr), |
| EHFrameSectionSize); |
| } |
| |
| Error deregisterEHFrames(JITTargetAddress EHFrameSectionAddr, |
| size_t EHFrameSectionSize) override { |
| return deregisterEHFrameSection( |
| jitTargetAddressToPointer<void *>(EHFrameSectionAddr), |
| EHFrameSectionSize); |
| } |
| |
| private: |
| InProcessEHFrameRegistrar(); |
| }; |
| |
| using StoreFrameRangeFunction = |
| std::function<void(JITTargetAddress EHFrameSectionAddr, |
| size_t EHFrameSectionSize)>; |
| |
| /// Creates a pass that records the address and size of the EH frame section. |
| /// If no eh-frame section is found then the address and size will both be given |
| /// as zero. |
| /// |
| /// Authors of JITLinkContexts can use this function to register a post-fixup |
| /// pass that records the range of the eh-frame section. This range can |
| /// be used after finalization to register and deregister the frame. |
| LinkGraphPassFunction |
| createEHFrameRecorderPass(const Triple &TT, |
| StoreFrameRangeFunction StoreFrameRange); |
| |
| } // end namespace jitlink |
| } // end namespace llvm |
| |
| #endif // LLVM_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORT_H |