1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
| //===- lib/ReaderWriter/MachO/WriterMachO.cpp -----------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "ExecutableAtoms.h"
#include "MachONormalizedFile.h"
#include "lld/Core/File.h"
#include "lld/Core/Writer.h"
#include "lld/ReaderWriter/MachOLinkingContext.h"
#include "llvm/BinaryFormat/MachO.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileOutputBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <system_error>
using lld::mach_o::normalized::NormalizedFile;
namespace lld {
namespace mach_o {
class MachOWriter : public Writer {
public:
MachOWriter(const MachOLinkingContext &ctxt) : _ctx(ctxt) {}
llvm::Error writeFile(const lld::File &file, StringRef path) override {
// Construct empty normalized file from atoms.
llvm::Expected<std::unique_ptr<NormalizedFile>> nFile =
normalized::normalizedFromAtoms(file, _ctx);
if (auto ec = nFile.takeError())
return ec;
// For testing, write out yaml form of normalized file.
if (_ctx.printAtoms()) {
std::unique_ptr<Writer> yamlWriter = createWriterYAML(_ctx);
if (auto ec = yamlWriter->writeFile(file, "-"))
return ec;
}
// Write normalized file as mach-o binary.
return writeBinary(*nFile->get(), path);
}
void createImplicitFiles(std::vector<std::unique_ptr<File>> &r) override {
// When building main executables, add _main as required entry point.
if (_ctx.outputTypeHasEntry())
r.emplace_back(new CEntryFile(_ctx));
// If this can link with dylibs, need helper function (dyld_stub_binder).
if (_ctx.needsStubsPass())
r.emplace_back(new StubHelperFile(_ctx));
// Final linked images can access a symbol for their mach_header.
if (_ctx.outputMachOType() != llvm::MachO::MH_OBJECT)
r.emplace_back(new MachHeaderAliasFile(_ctx));
}
private:
const MachOLinkingContext &_ctx;
};
} // namespace mach_o
std::unique_ptr<Writer> createWriterMachO(const MachOLinkingContext &context) {
return std::unique_ptr<Writer>(new lld::mach_o::MachOWriter(context));
}
} // namespace lld
|