LLVM 19.0.0git
XCOFFWriter.cpp
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1//===- XCOFFWriter.cpp ----------------------------------------------------===//
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#include "llvm/Support/Errc.h"
10#include "XCOFFWriter.h"
11
12namespace llvm {
13namespace objcopy {
14namespace xcoff {
15
16using namespace object;
17
18void XCOFFWriter::finalizeHeaders() {
19 // File header.
20 FileSize += sizeof(XCOFFFileHeader32);
21 // Optional file header.
22 FileSize += Obj.FileHeader.AuxHeaderSize;
23 // Section headers.
24 FileSize += sizeof(XCOFFSectionHeader32) * Obj.Sections.size();
25}
26
27void XCOFFWriter::finalizeSections() {
28 for (const Section &Sec : Obj.Sections) {
29 // Section data.
30 FileSize += Sec.Contents.size();
31 // Relocations.
32 FileSize +=
33 Sec.SectionHeader.NumberOfRelocations * sizeof(XCOFFRelocation32);
34 }
35}
36
37void XCOFFWriter::finalizeSymbolStringTable() {
38 assert(Obj.FileHeader.SymbolTableOffset >= FileSize);
39 FileSize = Obj.FileHeader.SymbolTableOffset;
40 // Symbols and auxiliary entries.
41 FileSize +=
43 // String table.
44 FileSize += Obj.StringTable.size();
45}
46
47void XCOFFWriter::finalize() {
48 FileSize = 0;
49 finalizeHeaders();
50 finalizeSections();
51 finalizeSymbolStringTable();
52}
53
54void XCOFFWriter::writeHeaders() {
55 // Write the file header.
56 uint8_t *Ptr = reinterpret_cast<uint8_t *>(Buf->getBufferStart());
57 memcpy(Ptr, &Obj.FileHeader, sizeof(XCOFFFileHeader32));
58 Ptr += sizeof(XCOFFFileHeader32);
59
60 // Write the optional header.
61 if (Obj.FileHeader.AuxHeaderSize) {
64 }
65
66 // Write section headers.
67 for (const Section &Sec : Obj.Sections) {
68 memcpy(Ptr, &Sec.SectionHeader, sizeof(XCOFFSectionHeader32));
69 Ptr += sizeof(XCOFFSectionHeader32);
70 }
71}
72
73void XCOFFWriter::writeSections() {
74 // Write section data.
75 for (const Section &Sec : Obj.Sections) {
76 uint8_t *Ptr = reinterpret_cast<uint8_t *>(Buf->getBufferStart()) +
77 Sec.SectionHeader.FileOffsetToRawData;
78 Ptr = std::copy(Sec.Contents.begin(), Sec.Contents.end(), Ptr);
79 }
80
81 // Write relocations.
82 for (const Section &Sec : Obj.Sections) {
83 uint8_t *Ptr = reinterpret_cast<uint8_t *>(Buf->getBufferStart()) +
84 Sec.SectionHeader.FileOffsetToRelocationInfo;
85 for (const XCOFFRelocation32 &Rel : Sec.Relocations) {
86 memcpy(Ptr, &Rel, sizeof(XCOFFRelocation32));
87 Ptr += sizeof(XCOFFRelocation32);
88 }
89 }
90}
91
92void XCOFFWriter::writeSymbolStringTable() {
93 // Write symbols.
94 uint8_t *Ptr = reinterpret_cast<uint8_t *>(Buf->getBufferStart()) +
96 for (const Symbol &Sym : Obj.Symbols) {
97 memcpy(Ptr, &Sym.Sym, XCOFF::SymbolTableEntrySize);
99 // Auxiliary symbols.
100 memcpy(Ptr, Sym.AuxSymbolEntries.data(), Sym.AuxSymbolEntries.size());
101 Ptr += Sym.AuxSymbolEntries.size();
102 }
103 // Write the string table.
104 memcpy(Ptr, Obj.StringTable.data(), Obj.StringTable.size());
105 Ptr += Obj.StringTable.size();
106}
107
109 finalize();
111 if (!Buf)
113 "failed to allocate memory buffer of " +
114 Twine::utohexstr(FileSize) + " bytes");
115
116 writeHeaders();
117 writeSections();
118 writeSymbolStringTable();
119 Out.write(Buf->getBufferStart(), Buf->getBufferSize());
120 return Error::success();
121}
122
123} // end namespace xcoff
124} // end namespace objcopy
125} // end namespace llvm
for(const MachineOperand &MO :llvm::drop_begin(OldMI.operands(), Desc.getNumOperands()))
Symbol * Sym
Definition: ELF_riscv.cpp:479
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
Lightweight error class with error context and mandatory checking.
Definition: Error.h:160
static ErrorSuccess success()
Create a success value.
Definition: Error.h:334
constexpr size_t size() const
size - Get the string size.
Definition: StringRef.h:137
constexpr const char * data() const
data - Get a pointer to the start of the string (which may not be null terminated).
Definition: StringRef.h:131
static Twine utohexstr(const uint64_t &Val)
Definition: Twine.h:416
static std::unique_ptr< WritableMemoryBuffer > getNewMemBuffer(size_t Size, const Twine &BufferName="")
Allocate a new zero-initialized MemoryBuffer of the specified size.
raw_ostream & write(unsigned char C)
constexpr size_t SymbolTableEntrySize
Definition: XCOFF.h:38
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
Error createStringError(std::error_code EC, char const *Fmt, const Ts &... Vals)
Create formatted StringError object.
Definition: Error.h:1244
XCOFFAuxiliaryHeader32 OptionalFileHeader
Definition: XCOFFObject.h:38
std::vector< Symbol > Symbols
Definition: XCOFFObject.h:40
XCOFFFileHeader32 FileHeader
Definition: XCOFFObject.h:37
std::vector< Section > Sections
Definition: XCOFFObject.h:39
support::big32_t NumberOfSymTableEntries
support::ubig32_t SymbolTableOffset