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::object;
  18
  19 namespace llvm {
  20 void 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 Error 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