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//===- Writer.h -------------------------------------------------*- C++ -*-===//
// The LLVM Linker
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
#include "Chunks.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Object/COFF.h"
#include <chrono>
#include <cstdint>
#include <vector>
namespace lld {
namespace coff {
static const int PageSize = 4096;
void writeResult();
// OutputSection represents a section in an output file. It's a
// container of chunks. OutputSection and Chunk are 1:N relationship.
// Chunks cannot belong to more than one OutputSections. The writer
// creates multiple OutputSections and assign them unique,
// non-overlapping file offsets and RVAs.
class OutputSection {
OutputSection(llvm::StringRef N, uint32_t Chars) : Name(N) {
Header.Characteristics = Chars;
void addChunk(Chunk *C);
void merge(OutputSection *Other);
ArrayRef<Chunk *> getChunks() { return Chunks; }
void addPermissions(uint32_t C);
void setPermissions(uint32_t C);
uint64_t getRVA() { return Header.VirtualAddress; }
uint64_t getFileOff() { return Header.PointerToRawData; }
void writeHeaderTo(uint8_t *Buf);
// Returns the size of this section in an executable memory image.
// This may be smaller than the raw size (the raw size is multiple
// of disk sector size, so there may be padding at end), or may be
// larger (if that's the case, the loader reserves spaces after end
// of raw data).
uint64_t getVirtualSize() { return Header.VirtualSize; }
// Returns the size of the section in the output file.
uint64_t getRawSize() { return Header.SizeOfRawData; }
// Set offset into the string table storing this section name.
// Used only when the name is longer than 8 bytes.
void setStringTableOff(uint32_t V) { StringTableOff = V; }
// N.B. The section index is one based.
uint32_t SectionIndex = 0;
llvm::StringRef Name;
llvm::object::coff_section Header = {};
uint32_t StringTableOff = 0;
std::vector<Chunk *> Chunks;