1 //===-- WasmDump.cpp - wasm-specific dumper ---------------------*- 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 /// \file
10 /// This file implements the wasm-specific dumper for llvm-objdump.
11 ///
12 //===----------------------------------------------------------------------===//
13 
14 #include "WasmDump.h"
15 
16 #include "llvm-objdump.h"
17 #include "llvm/Object/Wasm.h"
18 
19 using namespace llvm;
20 using namespace llvm::object;
21 
22 namespace {
23 class WasmDumper : public objdump::Dumper {
24   const WasmObjectFile &Obj;
25 
26 public:
27   WasmDumper(const WasmObjectFile &O) : Dumper(O), Obj(O) {}
28   void printPrivateHeaders(bool MachOOnlyFirst) override;
29 };
30 } // namespace
31 
32 std::unique_ptr<objdump::Dumper>
33 objdump::createWasmDumper(const object::WasmObjectFile &Obj) {
34   return std::make_unique<WasmDumper>(Obj);
35 }
36 
37 void WasmDumper::printPrivateHeaders(bool) {
38   outs() << "Program Header:\n";
39   outs() << "Version: 0x";
40   outs().write_hex(Obj.getHeader().Version);
41   outs() << "\n";
42 }
43 
44 Error objdump::getWasmRelocationValueString(const WasmObjectFile *Obj,
45                                             const RelocationRef &RelRef,
46                                             SmallVectorImpl<char> &Result) {
47   const wasm::WasmRelocation &Rel = Obj->getWasmRelocation(RelRef);
48   symbol_iterator SI = RelRef.getSymbol();
49   std::string FmtBuf;
50   raw_string_ostream Fmt(FmtBuf);
51   if (SI == Obj->symbol_end()) {
52     // Not all wasm relocations have symbols associated with them.
53     // In particular R_WASM_TYPE_INDEX_LEB.
54     Fmt << Rel.Index;
55   } else {
56     Expected<StringRef> SymNameOrErr = SI->getName();
57     if (!SymNameOrErr)
58       return SymNameOrErr.takeError();
59     StringRef SymName = *SymNameOrErr;
60     Result.append(SymName.begin(), SymName.end());
61   }
62   Fmt << (Rel.Addend < 0 ? "" : "+") << Rel.Addend;
63   Fmt.flush();
64   Result.append(FmtBuf.begin(), FmtBuf.end());
65   return Error::success();
66 }
67