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5112035751
The LSDA pointers are encoded as offsets from the image base, and arranged in one big contiguous array. Each second-level page records the offset within that LSDA array which corresponds to the LSDA for its first CU entry. Reviewed By: clayborg Differential Revision: https://reviews.llvm.org/D95810
86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
//===- UnwindInfoSection.h ------------------------------------------------===//
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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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#ifndef LLD_MACHO_UNWIND_INFO_H
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#define LLD_MACHO_UNWIND_INFO_H
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#include "MergedOutputSection.h"
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#include "SyntheticSections.h"
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#include "mach-o/compact_unwind_encoding.h"
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#include "llvm/ADT/DenseMap.h"
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#include <vector>
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// In 2020, we mostly care about 64-bit targets: x86_64 and arm64
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struct CompactUnwindEntry64 {
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uint64_t functionAddress;
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uint32_t functionLength;
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compact_unwind_encoding_t encoding;
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uint64_t personality;
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uint64_t lsda;
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};
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// FIXME(gkm): someday we might care about 32-bit targets: x86 & arm
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struct CompactUnwindEntry32 {
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uint32_t functionAddress;
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uint32_t functionLength;
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compact_unwind_encoding_t encoding;
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uint32_t personality;
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uint32_t lsda;
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};
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namespace lld {
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namespace macho {
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class UnwindInfoSection : public SyntheticSection {
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public:
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UnwindInfoSection();
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uint64_t getSize() const override { return unwindInfoSize; }
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bool isNeeded() const override;
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void finalize() override;
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void writeTo(uint8_t *buf) const override;
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void setCompactUnwindSection(MergedOutputSection *cuSection) {
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compactUnwindSection = cuSection;
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}
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using EncodingMap = llvm::DenseMap<compact_unwind_encoding_t, size_t>;
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struct SecondLevelPage {
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uint32_t kind;
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size_t entryIndex;
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size_t entryCount;
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size_t byteCount;
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std::vector<compact_unwind_encoding_t> localEncodings;
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EncodingMap localEncodingIndexes;
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};
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private:
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std::vector<std::pair<compact_unwind_encoding_t, size_t>> commonEncodings;
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EncodingMap commonEncodingIndexes;
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// Indices of personality functions within the GOT.
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std::vector<uint32_t> personalities;
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std::vector<unwind_info_section_header_lsda_index_entry> lsdaEntries;
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// Map of function offset (from the image base) to an index within the LSDA
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// array.
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llvm::DenseMap<uint32_t, uint32_t> functionToLsdaIndex;
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std::vector<CompactUnwindEntry64> cuVector;
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std::vector<CompactUnwindEntry64 *> cuPtrVector;
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std::vector<SecondLevelPage> secondLevelPages;
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MergedOutputSection *compactUnwindSection = nullptr;
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uint64_t level2PagesOffset = 0;
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uint64_t unwindInfoSize = 0;
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};
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void prepareCompactUnwind(InputSection *isec);
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} // namespace macho
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} // namespace lld
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#endif
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