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 
17 using namespace llvm;
18 using namespace object;
19 
20 void llvm::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 
29 std::error_code
30 llvm::getWasmRelocationValueString(const WasmObjectFile *Obj,
31                                    const RelocationRef &RelRef,
32                                    SmallVectorImpl<char> &Result) {
33   const wasm::WasmRelocation &Rel = Obj->getWasmRelocation(RelRef);
34   symbol_iterator SI = RelRef.getSymbol();
35   std::string FmtBuf;
36   raw_string_ostream Fmt(FmtBuf);
37   if (SI == Obj->symbol_end()) {
38     // Not all wasm relocations have symbols associated with them.
39     // In particular R_WASM_TYPE_INDEX_LEB.
40     Fmt << Rel.Index;
41   } else {
42     Expected<StringRef> SymNameOrErr = SI->getName();
43     if (!SymNameOrErr)
44       return errorToErrorCode(SymNameOrErr.takeError());
45     StringRef SymName = *SymNameOrErr;
46     Result.append(SymName.begin(), SymName.end());
47   }
48   Fmt << (Rel.Addend < 0 ? "" : "+") << Rel.Addend;
49   Fmt.flush();
50   Result.append(FmtBuf.begin(), FmtBuf.end());
51   return std::error_code();
52 }
53