llvm/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 "WasmDump.h"
  15
  16 #include "llvm-objdump.h"
  17 #include "llvm/Object/Wasm.h"
  18
  19 using namespace llvm;
  20 using namespace llvm::object;
  21
  22 namespace {
  23 class WasmDumper : public objdump::Dumper {
  24   const WasmObjectFile &Obj;
  25
  26 public:
  27   WasmDumper(const WasmObjectFile &O) : Dumper(O), Obj(O) {}
  28   void printPrivateHeaders() override;
  29 };
  30 } // namespace
  31
  32 std::unique_ptr<objdump::Dumper>
  33 objdump::createWasmDumper(const object::WasmObjectFile &Obj) {
  34   return std::make_unique<WasmDumper>(Obj);
  35 }
  36
  37 void WasmDumper::printPrivateHeaders() {
  38   outs() << "Program Header:\n";
  39   outs() << "Version: 0x";
  40   outs().write_hex(Obj.getHeader().Version);
  41   outs() << "\n";
  42 }
  43
  44 Error objdump::getWasmRelocationValueString(const WasmObjectFile *Obj,
  45                                             const RelocationRef &RelRef,
  46                                             SmallVectorImpl<char> &Result) {
  47   const wasm::WasmRelocation &Rel = Obj->getWasmRelocation(RelRef);
  48   symbol_iterator SI = RelRef.getSymbol();
  49   std::string FmtBuf;
  50   raw_string_ostream Fmt(FmtBuf);
  51   if (SI == Obj->symbol_end()) {
  52     // Not all wasm relocations have symbols associated with them.
  53     // In particular R_WASM_TYPE_INDEX_LEB.
  54     Fmt << Rel.Index;
  55   } else {
  56     Expected<StringRef> SymNameOrErr = SI->getName();
  57     if (!SymNameOrErr)
  58       return SymNameOrErr.takeError();
  59     StringRef SymName = *SymNameOrErr;
  60     Result.append(SymName.begin(), SymName.end());
  61   }
  62   Fmt << (Rel.Addend < 0 ? "" : "+") << Rel.Addend;
  63   Fmt.flush();
  64   Result.append(FmtBuf.begin(), FmtBuf.end());
  65   return Error::success();
  66 }