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09cca5b243
Generate import modules for each imported DLL, along with its symbol stream. Also create COFF groups in the * Linker * module, one for each PartialSection (input, unmerged sections) Currently COFF groups are disabled for MINGW because it significantly increases PDB sizes. We could enable that later with an option. The overall objective for this change is to support code hot patching tools. Such tools need to know the import libraries used, from the PDB alone. Differential Revision: https://reviews.llvm.org/D54802 llvm-svn: 357308
86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
//===- Writer.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_COFF_WRITER_H
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#define LLD_COFF_WRITER_H
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#include "Chunks.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Object/COFF.h"
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#include <chrono>
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#include <cstdint>
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#include <vector>
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namespace lld {
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namespace coff {
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static const int PageSize = 4096;
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void writeResult();
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class PartialSection {
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public:
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PartialSection(StringRef N, uint32_t Chars)
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: Name(N), Characteristics(Chars) {}
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StringRef Name;
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unsigned Characteristics;
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std::vector<Chunk *> Chunks;
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};
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// OutputSection represents a section in an output file. It's a
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// container of chunks. OutputSection and Chunk are 1:N relationship.
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// Chunks cannot belong to more than one OutputSections. The writer
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// creates multiple OutputSections and assign them unique,
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// non-overlapping file offsets and RVAs.
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class OutputSection {
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public:
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OutputSection(llvm::StringRef N, uint32_t Chars) : Name(N) {
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Header.Characteristics = Chars;
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}
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void addChunk(Chunk *C);
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void insertChunkAtStart(Chunk *C);
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void merge(OutputSection *Other);
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void setPermissions(uint32_t C);
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uint64_t getRVA() { return Header.VirtualAddress; }
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uint64_t getFileOff() { return Header.PointerToRawData; }
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void writeHeaderTo(uint8_t *Buf);
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void addContributingPartialSection(PartialSection *Sec);
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// Returns the size of this section in an executable memory image.
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// This may be smaller than the raw size (the raw size is multiple
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// of disk sector size, so there may be padding at end), or may be
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// larger (if that's the case, the loader reserves spaces after end
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// of raw data).
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uint64_t getVirtualSize() { return Header.VirtualSize; }
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// Returns the size of the section in the output file.
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uint64_t getRawSize() { return Header.SizeOfRawData; }
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// Set offset into the string table storing this section name.
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// Used only when the name is longer than 8 bytes.
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void setStringTableOff(uint32_t V) { StringTableOff = V; }
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// N.B. The section index is one based.
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uint32_t SectionIndex = 0;
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llvm::StringRef Name;
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llvm::object::coff_section Header = {};
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std::vector<Chunk *> Chunks;
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std::vector<Chunk *> OrigChunks;
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std::vector<PartialSection *> ContribSections;
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private:
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uint32_t StringTableOff = 0;
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};
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} // namespace coff
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} // namespace lld
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#endif
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