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comparison lld/COFF/Writer.h @ 150:1d019706d866

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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
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children 2e18cbf3894f
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147:c2174574ed3a 150:1d019706d866
1 //===- Writer.h -------------------------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #ifndef LLD_COFF_WRITER_H
10 #define LLD_COFF_WRITER_H
11
12 #include "Chunks.h"
13 #include "llvm/ADT/StringRef.h"
14 #include "llvm/Object/COFF.h"
15 #include <chrono>
16 #include <cstdint>
17 #include <vector>
18
19 namespace lld {
20 namespace coff {
21 static const int pageSize = 4096;
22
23 void writeResult();
24
25 class PartialSection {
26 public:
27 PartialSection(StringRef n, uint32_t chars)
28 : name(n), characteristics(chars) {}
29 StringRef name;
30 unsigned characteristics;
31 std::vector<Chunk *> chunks;
32 };
33
34 // OutputSection represents a section in an output file. It's a
35 // container of chunks. OutputSection and Chunk are 1:N relationship.
36 // Chunks cannot belong to more than one OutputSections. The writer
37 // creates multiple OutputSections and assign them unique,
38 // non-overlapping file offsets and RVAs.
39 class OutputSection {
40 public:
41 OutputSection(llvm::StringRef n, uint32_t chars) : name(n) {
42 header.Characteristics = chars;
43 }
44 void addChunk(Chunk *c);
45 void insertChunkAtStart(Chunk *c);
46 void merge(OutputSection *other);
47 void setPermissions(uint32_t c);
48 uint64_t getRVA() { return header.VirtualAddress; }
49 uint64_t getFileOff() { return header.PointerToRawData; }
50 void writeHeaderTo(uint8_t *buf);
51 void addContributingPartialSection(PartialSection *sec);
52
53 // Returns the size of this section in an executable memory image.
54 // This may be smaller than the raw size (the raw size is multiple
55 // of disk sector size, so there may be padding at end), or may be
56 // larger (if that's the case, the loader reserves spaces after end
57 // of raw data).
58 uint64_t getVirtualSize() { return header.VirtualSize; }
59
60 // Returns the size of the section in the output file.
61 uint64_t getRawSize() { return header.SizeOfRawData; }
62
63 // Set offset into the string table storing this section name.
64 // Used only when the name is longer than 8 bytes.
65 void setStringTableOff(uint32_t v) { stringTableOff = v; }
66
67 // N.B. The section index is one based.
68 uint32_t sectionIndex = 0;
69
70 llvm::StringRef name;
71 llvm::object::coff_section header = {};
72
73 std::vector<Chunk *> chunks;
74 std::vector<Chunk *> origChunks;
75
76 std::vector<PartialSection *> contribSections;
77
78 private:
79 uint32_t stringTableOff = 0;
80 };
81
82 } // namespace coff
83 } // namespace lld
84
85 #endif