61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
//===- lib/ReaderWriter/PECOFF/GroupedSectionsPass.h ----------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file \brief This pass sorts atoms by section name, so that they will appear
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/// in the correct order in the output.
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///
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/// In COFF, sections will be merged into one section by the linker if their
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/// names are the same after discarding the "$" character and all characters
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/// follow it from their names. The characters following the "$" character
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/// determines the merge order. Assume there's an object file containing four
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/// data sections in the following order.
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///
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/// - .data$2
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/// - .data$3
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/// - .data$1
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/// - .data
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///
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/// In this case, the resulting binary should have ".data" section with the
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/// contents of ".data", ".data$1", ".data$2" and ".data$3" in that order.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLD_READER_WRITER_PE_COFF_GROUPED_SECTIONS_PASS_H
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#define LLD_READER_WRITER_PE_COFF_GROUPED_SECTIONS_PASS_H
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#include "Atoms.h"
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#include "lld/Core/Pass.h"
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#include <algorithm>
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namespace lld {
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namespace pecoff {
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static bool compare(const DefinedAtom *left, const DefinedAtom *right) {
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if (left->sectionChoice() == DefinedAtom::sectionCustomRequired &&
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right->sectionChoice() == DefinedAtom::sectionCustomRequired) {
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return left->customSectionName().compare(right->customSectionName()) < 0;
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}
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return left->sectionChoice() == DefinedAtom::sectionCustomRequired &&
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right->sectionChoice() != DefinedAtom::sectionCustomRequired;
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}
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class GroupedSectionsPass : public lld::Pass {
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public:
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void perform(std::unique_ptr<MutableFile> &file) override {
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auto definedAtoms = file->definedAtoms();
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std::stable_sort(definedAtoms.begin(), definedAtoms.end(), compare);
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}
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};
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} // namespace pecoff
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} // namespace lld
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#endif
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