78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
//===--- UnwindInfoManager.h -- Register unwind info sections ---*- 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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// Utilities for managing eh-frame and compact-unwind registration and lookup
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// through libunwind's find_dynamic_unwind_sections mechanism.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_UNWINDINFOMANAGER_H
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#define LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_UNWINDINFOMANAGER_H
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#include "llvm/ExecutionEngine/Orc/Shared/ExecutorAddress.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Error.h"
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#include <map>
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#include <mutex>
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namespace llvm::orc {
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class UnwindInfoManager {
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public:
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// This struct's layout should match the unw_dynamic_unwind_sections struct
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// from libunwind/src/libunwid_ext.h.
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struct UnwindSections {
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uintptr_t dso_base;
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uintptr_t dwarf_section;
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size_t dwarf_section_length;
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uintptr_t compact_unwind_section;
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size_t compact_unwind_section_length;
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};
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UnwindInfoManager(UnwindInfoManager &&) = delete;
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UnwindInfoManager &operator=(UnwindInfoManager &&) = delete;
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LLVM_ABI ~UnwindInfoManager();
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/// If the libunwind find-dynamic-unwind-info callback registration APIs are
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/// available then this method will instantiate a global UnwindInfoManager
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/// instance suitable for the process and return true. Otherwise it will
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/// return false.
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LLVM_ABI static bool TryEnable();
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LLVM_ABI static void addBootstrapSymbols(StringMap<ExecutorAddr> &M);
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LLVM_ABI static Error
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registerSections(ArrayRef<orc::ExecutorAddrRange> CodeRanges,
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orc::ExecutorAddr DSOBase,
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orc::ExecutorAddrRange DWARFEHFrame,
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orc::ExecutorAddrRange CompactUnwind);
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LLVM_ABI static Error
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deregisterSections(ArrayRef<orc::ExecutorAddrRange> CodeRanges);
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private:
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UnwindInfoManager() = default;
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int findSectionsImpl(uintptr_t Addr, UnwindSections *Info);
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static int findSections(uintptr_t Addr, UnwindSections *Info);
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Error registerSectionsImpl(ArrayRef<orc::ExecutorAddrRange> CodeRanges,
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orc::ExecutorAddr DSOBase,
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orc::ExecutorAddrRange DWARFEHFrame,
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orc::ExecutorAddrRange CompactUnwind);
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Error deregisterSectionsImpl(ArrayRef<orc::ExecutorAddrRange> CodeRanges);
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std::mutex M;
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std::map<uintptr_t, UnwindSections> UWSecs;
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};
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} // namespace llvm::orc
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#endif // LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_UNWINDINFOMANAGER_H
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