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a74aa5a5a0
On MachO, processing of the eh-frame section should stop if the end of the __eh_frame section is reached, regardless of whether or not there is a null CFI length field at the end of the section. This patch tracks the eh-frame section size and threads it through the appropriate APIs so that processing can be terminated correctly. No testcase yet: This patch is all API plumbing (rather than modification of linked memory) which the existing infrastructure does not provide a way of testing. Committing without a testcase until I have an idea of how to write one. llvm-svn: 370074
92 lines
3.4 KiB
C++
92 lines
3.4 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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size_t EHFrameSectionSize);
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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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size_t EHFrameSectionSize);
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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,
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size_t EHFrameSectionSize) = 0;
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virtual Error deregisterEHFrames(JITTargetAddress EHFrameSectionAddr,
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size_t EHFrameSectionSize) = 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,
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size_t EHFrameSectionSize) override {
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return registerEHFrameSection(
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jitTargetAddressToPointer<void *>(EHFrameSectionAddr),
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EHFrameSectionSize);
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}
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Error deregisterEHFrames(JITTargetAddress EHFrameSectionAddr,
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size_t EHFrameSectionSize) override {
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return deregisterEHFrameSection(
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jitTargetAddressToPointer<void *>(EHFrameSectionAddr),
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EHFrameSectionSize);
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}
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private:
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InProcessEHFrameRegistrar();
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};
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using StoreFrameRangeFunction =
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std::function<void(JITTargetAddress EHFrameSectionAddr,
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size_t EHFrameSectionSize)>;
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/// Creates a pass that records the address and size of the EH frame section.
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/// If no eh-frame section is found then the address and size will both be given
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/// as 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 range of the eh-frame section. This range 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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StoreFrameRangeFunction StoreFrameRange);
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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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