1 //===------ utils/obj2yaml.cpp - obj2yaml conversion tool -----------------===//
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 "obj2yaml.h"
10 #include "llvm/BinaryFormat/Magic.h"
11 #include "llvm/Object/Archive.h"
12 #include "llvm/Object/COFF.h"
13 #include "llvm/Object/Minidump.h"
14 #include "llvm/Support/CommandLine.h"
15 #include "llvm/Support/Errc.h"
16 #include "llvm/Support/InitLLVM.h"
17 
18 using namespace llvm;
19 using namespace llvm::object;
20 
21 static cl::opt<std::string>
22     InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
23 static cl::bits<RawSegments> RawSegment(
24     "raw-segment",
25     cl::desc("Mach-O: dump the raw contents of the listed segments instead of "
26              "parsing them:"),
27     cl::values(clEnumVal(data, "__DATA"), clEnumVal(linkedit, "__LINKEDIT")));
28 
29 static Error dumpObject(const ObjectFile &Obj) {
30   if (Obj.isCOFF())
31     return errorCodeToError(coff2yaml(outs(), cast<COFFObjectFile>(Obj)));
32 
33   if (Obj.isXCOFF())
34     return xcoff2yaml(outs(), cast<XCOFFObjectFile>(Obj));
35 
36   if (Obj.isELF())
37     return elf2yaml(outs(), Obj);
38 
39   if (Obj.isWasm())
40     return errorCodeToError(wasm2yaml(outs(), cast<WasmObjectFile>(Obj)));
41 
42   llvm_unreachable("unexpected object file format");
43 }
44 
45 static Error dumpInput(StringRef File) {
46   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
47       MemoryBuffer::getFileOrSTDIN(File, /*IsText=*/false,
48                                    /*RequiresNullTerminator=*/false);
49   if (std::error_code EC = FileOrErr.getError())
50     return errorCodeToError(EC);
51   std::unique_ptr<MemoryBuffer> &Buffer = FileOrErr.get();
52   MemoryBufferRef MemBuf = Buffer->getMemBufferRef();
53   if (file_magic::archive == identify_magic(MemBuf.getBuffer()))
54     return archive2yaml(outs(), MemBuf);
55 
56   Expected<std::unique_ptr<Binary>> BinOrErr =
57       createBinary(MemBuf, /*Context=*/nullptr);
58   if (!BinOrErr)
59     return BinOrErr.takeError();
60 
61   Binary &Binary = *BinOrErr->get();
62   // Universal MachO is not a subclass of ObjectFile, so it needs to be handled
63   // here with the other binary types.
64   if (Binary.isMachO() || Binary.isMachOUniversalBinary())
65     return macho2yaml(outs(), Binary, RawSegment.getBits());
66   if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
67     return dumpObject(*Obj);
68   if (MinidumpFile *Minidump = dyn_cast<MinidumpFile>(&Binary))
69     return minidump2yaml(outs(), *Minidump);
70 
71   return Error::success();
72 }
73 
74 static void reportError(StringRef Input, Error Err) {
75   if (Input == "-")
76     Input = "<stdin>";
77   std::string ErrMsg;
78   raw_string_ostream OS(ErrMsg);
79   logAllUnhandledErrors(std::move(Err), OS);
80   OS.flush();
81   errs() << "Error reading file: " << Input << ": " << ErrMsg;
82   errs().flush();
83 }
84 
85 int main(int argc, char *argv[]) {
86   InitLLVM X(argc, argv);
87   cl::ParseCommandLineOptions(argc, argv);
88 
89   if (Error Err = dumpInput(InputFilename)) {
90     reportError(InputFilename, std::move(Err));
91     return 1;
92   }
93 
94   return 0;
95 }
96