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55280dd6d4
Replaces direct calls to eh-frame registration with calls to methods on an EHFrameRegistrar instance. This allows clients to substitute a registrar that registers frames in a remote process via IPC/RPC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@365098 91177308-0d34-0410-b5e6-96231b3b80d8
81 lines
3.0 KiB
C++
81 lines
3.0 KiB
C++
//===--------- EHFrameSupport.h - JITLink eh-frame utils --------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// EHFrame registration support for JITLink.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORT_H
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#define LLVM_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORT_H
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#include "llvm/ADT/Triple.h"
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#include "llvm/ExecutionEngine/JITLink/JITLink.h"
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#include "llvm/ExecutionEngine/JITSymbol.h"
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#include "llvm/Support/Error.h"
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namespace llvm {
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namespace jitlink {
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/// Registers all FDEs in the given eh-frame section with the current process.
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Error registerEHFrameSection(const void *EHFrameSectionAddr);
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/// Deregisters all FDEs in the given eh-frame section with the current process.
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Error deregisterEHFrameSection(const void *EHFrameSectionAddr);
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/// Supports registration/deregistration of EH-frames in a target process.
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class EHFrameRegistrar {
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public:
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virtual ~EHFrameRegistrar();
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virtual Error registerEHFrames(JITTargetAddress EHFrameSectionAddr) = 0;
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virtual Error deregisterEHFrames(JITTargetAddress EHFrameSectionAddr) = 0;
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};
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/// Registers / Deregisters EH-frames in the current process.
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class InProcessEHFrameRegistrar final : public EHFrameRegistrar {
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public:
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/// Get a reference to the InProcessEHFrameRegistrar singleton.
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static InProcessEHFrameRegistrar &getInstance();
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InProcessEHFrameRegistrar(const InProcessEHFrameRegistrar &) = delete;
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InProcessEHFrameRegistrar &
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operator=(const InProcessEHFrameRegistrar &) = delete;
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InProcessEHFrameRegistrar(InProcessEHFrameRegistrar &&) = delete;
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InProcessEHFrameRegistrar &operator=(InProcessEHFrameRegistrar &&) = delete;
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Error registerEHFrames(JITTargetAddress EHFrameSectionAddr) override {
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return registerEHFrameSection(
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jitTargetAddressToPointer<void *>(EHFrameSectionAddr));
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}
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Error deregisterEHFrames(JITTargetAddress EHFrameSectionAddr) override {
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return deregisterEHFrameSection(
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jitTargetAddressToPointer<void *>(EHFrameSectionAddr));
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}
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private:
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InProcessEHFrameRegistrar();
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};
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using StoreFrameAddressFunction = std::function<void(JITTargetAddress)>;
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/// Creates a pass that records the address of the EH frame section. If no
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/// eh-frame section is found, it will set EHFrameAddr to zero.
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///
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/// Authors of JITLinkContexts can use this function to register a post-fixup
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/// pass that records the address of the eh-frame section. This address can
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/// be used after finalization to register and deregister the frame.
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AtomGraphPassFunction
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createEHFrameRecorderPass(const Triple &TT,
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StoreFrameAddressFunction StoreFrameAddress);
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} // end namespace jitlink
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} // end namespace llvm
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#endif // LLVM_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORT_H
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