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 "llvm-objdump.h"
15#include "llvm/Object/Wasm.h"
16
17using namespace llvm::object;
18
19namespace llvm {
20void printWasmFileHeader(const object::ObjectFile *Obj) {
21  const auto *File = dyn_cast<const WasmObjectFile>(Obj);
22
23  outs() << "Program Header:\n";
24  outs() << "Version: 0x";
25  outs().write_hex(File->getHeader().Version);
26  outs() << "\n";
27}
28
29Error getWasmRelocationValueString(const WasmObjectFile *Obj,
30                                         const RelocationRef &RelRef,
31                                         SmallVectorImpl<char> &Result) {
32  const wasm::WasmRelocation &Rel = Obj->getWasmRelocation(RelRef);
33  symbol_iterator SI = RelRef.getSymbol();
34  std::string FmtBuf;
35  raw_string_ostream Fmt(FmtBuf);
36  if (SI == Obj->symbol_end()) {
37    // Not all wasm relocations have symbols associated with them.
38    // In particular R_WASM_TYPE_INDEX_LEB.
39    Fmt << Rel.Index;
40  } else {
41    Expected<StringRef> SymNameOrErr = SI->getName();
42    if (!SymNameOrErr)
43      return SymNameOrErr.takeError();
44    StringRef SymName = *SymNameOrErr;
45    Result.append(SymName.begin(), SymName.end());
46  }
47  Fmt << (Rel.Addend < 0 ? "" : "+") << Rel.Addend;
48  Fmt.flush();
49  Result.append(FmtBuf.begin(), FmtBuf.end());
50  return Error::success();
51}
52} // namespace llvm
53