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85 lines
2.8 KiB
85 lines
2.8 KiB
//===- 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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private:
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std::vector<std::pair<compact_unwind_encoding_t, size_t>> commonEncodings;
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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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std::vector<CompactUnwindEntry64> cuVector;
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std::vector<const CompactUnwindEntry64 *> cuPtrVector;
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std::vector<std::vector<const CompactUnwindEntry64 *>::const_iterator>
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pageBounds;
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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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#define UNWIND_INFO_COMMON_ENCODINGS_MAX 127
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#define UNWIND_INFO_SECOND_LEVEL_PAGE_SIZE 4096
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#define UNWIND_INFO_REGULAR_SECOND_LEVEL_ENTRIES_MAX \
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((UNWIND_INFO_SECOND_LEVEL_PAGE_SIZE - \
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sizeof(unwind_info_regular_second_level_page_header)) / \
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sizeof(unwind_info_regular_second_level_entry))
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#define UNWIND_INFO_COMPRESSED_SECOND_LEVEL_ENTRIES_MAX \
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((UNWIND_INFO_SECOND_LEVEL_PAGE_SIZE - \
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sizeof(unwind_info_compressed_second_level_page_header)) / \
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sizeof(uint32_t))
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#define UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET_BITS 24
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#define UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET_MASK \
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UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(~0)
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} // namespace macho
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} // namespace lld
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#endif
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