tools/llvm-objdump/WasmDump.cpp

   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 }