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| //===- Writer.h -------------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLD_COFF_WRITER_H
#define LLD_COFF_WRITER_H
#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();
class PartialSection {
public:
PartialSection(StringRef n, uint32_t chars)
: name(n), characteristics(chars) {}
StringRef name;
unsigned characteristics;
std::vector<Chunk *> chunks;
};
// 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 {
public:
OutputSection(llvm::StringRef n, uint32_t chars) : name(n) {
header.Characteristics = chars;
}
void addChunk(Chunk *c);
void insertChunkAtStart(Chunk *c);
void merge(OutputSection *other);
void setPermissions(uint32_t c);
uint64_t getRVA() { return header.VirtualAddress; }
uint64_t getFileOff() { return header.PointerToRawData; }
void writeHeaderTo(uint8_t *buf);
void addContributingPartialSection(PartialSection *sec);
// 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 = {};
std::vector<Chunk *> chunks;
std::vector<Chunk *> origChunks;
std::vector<PartialSection *> contribSections;
private:
uint32_t stringTableOff = 0;
};
} // namespace coff
} // namespace lld
#endif
|