58f3c5e696
This supersedes https://github.com/llvm/llvm-project/pull/87818 and fixes https://github.com/llvm/llvm-project/issues/52767 When calculating arm64 thunks, we make a few assumptions that may not hold when considering code sections outside of `__text`: 1. That a section needs thunks only if its size is larger than the branch range. 2. That any calls into `__stubs` are necessarily forward jumps (that is, the section with the jump is ordered before `__stubs`) Sections like this exist in the wild, most prominently the `__lcxx_overrides` section introduced in https://github.com/llvm/llvm-project/pull/69498 This change: - Ensures that if one section in `__TEXT` gets thunks, all of them do. - Makes all code sections in `__TEXT` contiguous (and guaranteed to be placed before `__stubs`)
79 lines
2.1 KiB
C++
79 lines
2.1 KiB
C++
//===- OutputSegment.h ------------------------------------------*- 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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#ifndef LLD_MACHO_OUTPUT_SEGMENT_H
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#define LLD_MACHO_OUTPUT_SEGMENT_H
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#include "OutputSection.h"
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#include "Symbols.h"
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#include "lld/Common/LLVM.h"
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#include "llvm/ADT/TinyPtrVector.h"
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#include <limits>
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#include <vector>
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namespace lld::macho {
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namespace segment_names {
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constexpr const char dataConst[] = "__DATA_CONST";
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constexpr const char dataDirty[] = "__DATA_DIRTY";
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constexpr const char data[] = "__DATA";
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constexpr const char dwarf[] = "__DWARF";
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constexpr const char import[] = "__IMPORT";
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constexpr const char ld[] = "__LD"; // output only with -r
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constexpr const char linkEdit[] = "__LINKEDIT";
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constexpr const char llvm[] = "__LLVM";
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constexpr const char pageZero[] = "__PAGEZERO";
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constexpr const char textExec[] = "__TEXT_EXEC";
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constexpr const char text[] = "__TEXT";
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} // namespace segment_names
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class OutputSection;
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class InputSection;
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class OutputSegment {
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public:
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void addOutputSection(OutputSection *os);
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void sortOutputSections();
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void assignAddressesToStartEndSymbols();
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const std::vector<OutputSection *> &getSections() const { return sections; }
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size_t numNonHiddenSections() const;
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uint64_t fileOff = 0;
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uint64_t fileSize = 0;
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uint64_t addr = 0;
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uint64_t vmSize = 0;
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int inputOrder = UnspecifiedInputOrder;
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StringRef name;
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uint32_t maxProt = 0;
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uint32_t initProt = 0;
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uint32_t flags = 0;
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uint8_t index;
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bool needsThunks = false;
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llvm::TinyPtrVector<Defined *> segmentStartSymbols;
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llvm::TinyPtrVector<Defined *> segmentEndSymbols;
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private:
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std::vector<OutputSection *> sections;
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};
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extern std::vector<OutputSegment *> outputSegments;
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void sortOutputSegments();
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void resetOutputSegments();
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OutputSegment *getOrCreateOutputSegment(StringRef name);
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} // namespace lld::macho
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#endif
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