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
19using namespace llvm;
20using namespace llvm::object;
21
22void objdump::printWasmFileHeader(const object::ObjectFile *Obj) {
23  const auto *File = cast<const WasmObjectFile>(Obj);
24
25  outs() << "Program Header:\n";
26  outs() << "Version: 0x";
27  outs().write_hex(File->getHeader().Version);
28  outs() << "\n";
29}
30
31Error objdump::getWasmRelocationValueString(const WasmObjectFile *Obj,
32                                            const RelocationRef &RelRef,
33                                            SmallVectorImpl<char> &Result) {
34  const wasm::WasmRelocation &Rel = Obj->getWasmRelocation(RelRef);
35  symbol_iterator SI = RelRef.getSymbol();
36  std::string FmtBuf;
37  raw_string_ostream Fmt(FmtBuf);
38  if (SI == Obj->symbol_end()) {
39    // Not all wasm relocations have symbols associated with them.
40    // In particular R_WASM_TYPE_INDEX_LEB.
41    Fmt << Rel.Index;
42  } else {
43    Expected<StringRef> SymNameOrErr = SI->getName();
44    if (!SymNameOrErr)
45      return SymNameOrErr.takeError();
46    StringRef SymName = *SymNameOrErr;
47    Result.append(SymName.begin(), SymName.end());
48  }
49  Fmt << (Rel.Addend < 0 ? "" : "+") << Rel.Addend;
50  Fmt.flush();
51  Result.append(FmtBuf.begin(), FmtBuf.end());
52  return Error::success();
53}
54