tools/obj2yaml/coff2yaml.cpp

   1 //===------ utils/obj2yaml.cpp - obj2yaml conversion tool -------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "obj2yaml.h"
  11 #include "llvm/Object/COFF.h"
  12 #include "llvm/Object/COFFYaml.h"
  13 #include "llvm/Support/ErrorHandling.h"
  14 #include "llvm/Support/YAMLTraits.h"
  15
  16 using namespace llvm;
  17
  18 namespace {
  19
  20 class COFFDumper {
  21   const object::COFFObjectFile &Obj;
  22   COFFYAML::Object YAMLObj;
  23   void dumpHeader(const object::coff_file_header *Header);
  24   void dumpSections(unsigned numSections);
  25   void dumpSymbols(unsigned numSymbols);
  26   StringRef getHexString(ArrayRef<uint8_t> Data);
  27   std::vector<std::string> Strings;
  28
  29 public:
  30   COFFDumper(const object::COFFObjectFile &Obj);
  31   COFFYAML::Object &getYAMLObj();
  32 };
  33
  34 }
  35
  36 static void check(error_code ec) {
  37   if (ec)
  38     report_fatal_error(ec.message());
  39 }
  40
  41 COFFDumper::COFFDumper(const object::COFFObjectFile &Obj) : Obj(Obj) {
  42   const object::coff_file_header *Header;
  43   check(Obj.getHeader(Header));
  44   dumpHeader(Header);
  45   dumpSections(Header->NumberOfSections);
  46   dumpSymbols(Header->NumberOfSymbols);
  47 }
  48
  49 void COFFDumper::dumpHeader(const object::coff_file_header *Header) {
  50   YAMLObj.Header.Machine = Header->Machine;
  51   YAMLObj.Header.Characteristics = Header->Characteristics;
  52 }
  53
  54 void COFFDumper::dumpSections(unsigned NumSections) {
  55   std::vector<COFFYAML::Section> &Sections = YAMLObj.Sections;
  56   error_code ec;
  57   for (object::section_iterator iter = Obj.begin_sections();
  58        iter != Obj.end_sections(); iter.increment(ec)) {
  59     check(ec);
  60     const object::coff_section *Sect = Obj.getCOFFSection(iter);
  61     COFFYAML::Section Sec;
  62     Sec.Name = Sect->Name; // FIXME: check the null termination!
  63     uint32_t Characteristics = Sect->Characteristics;
  64     Sec.Header.Characteristics = Characteristics;
  65     Sec.Alignment = 1 << (((Characteristics >> 20) & 0xf) - 1);
  66
  67     ArrayRef<uint8_t> sectionData;
  68     Obj.getSectionContents(Sect, sectionData);
  69     Sec.SectionData = getHexString(sectionData);
  70
  71     std::vector<COFF::relocation> Relocations;
  72     for (object::relocation_iterator rIter = iter->begin_relocations();
  73                        rIter != iter->end_relocations(); rIter.increment(ec)) {
  74       const object::coff_relocation *reloc = Obj.getCOFFRelocation(rIter);
  75       COFF::relocation Rel;
  76       Rel.VirtualAddress = reloc->VirtualAddress;
  77       Rel.SymbolTableIndex = reloc->SymbolTableIndex;
  78       Rel.Type = reloc->Type;
  79       Relocations.push_back(Rel);
  80     }
  81     Sec.Relocations = Relocations;
  82     Sections.push_back(Sec);
  83   }
  84 }
  85
  86 void COFFDumper::dumpSymbols(unsigned NumSymbols) {
  87   error_code ec;
  88   std::vector<COFFYAML::Symbol> &Symbols = YAMLObj.Symbols;
  89   for (object::symbol_iterator iter = Obj.begin_symbols();
  90        iter != Obj.end_symbols(); iter.increment(ec)) {
  91     check(ec);
  92     const object::coff_symbol *Symbol = Obj.getCOFFSymbol(iter);
  93     COFFYAML::Symbol Sym;
  94     Obj.getSymbolName(Symbol, Sym.Name);
  95     Sym.SimpleType = COFF::SymbolBaseType(Symbol->getBaseType());
  96     Sym.ComplexType = COFF::SymbolComplexType(Symbol->getComplexType());
  97     Sym.Header.StorageClass = Symbol->StorageClass;
  98     Sym.Header.Value = Symbol->Value;
  99     Sym.Header.SectionNumber = Symbol->SectionNumber;
 100     Sym.Header.NumberOfAuxSymbols = Symbol->NumberOfAuxSymbols;
 101     Sym.AuxiliaryData = getHexString(Obj.getSymbolAuxData(Symbol));
 102     Symbols.push_back(Sym);
 103   }
 104 }
 105
 106 StringRef COFFDumper::getHexString(ArrayRef<uint8_t> Data) {
 107   std::string S;
 108   for (ArrayRef<uint8_t>::iterator I = Data.begin(), E = Data.end(); I != E;
 109        ++I) {
 110     uint8_t Byte = *I;
 111     S.push_back(hexdigit(Byte >> 4));
 112     S.push_back(hexdigit(Byte & 0xf));
 113   }
 114   Strings.push_back(S);
 115   return Strings.back();
 116 }
 117
 118 COFFYAML::Object &COFFDumper::getYAMLObj() {
 119   return YAMLObj;
 120 }
 121
 122 error_code coff2yaml(raw_ostream &Out, MemoryBuffer *Buff) {
 123   error_code ec;
 124   object::COFFObjectFile Obj(Buff, ec);
 125   check(ec);
 126   COFFDumper Dumper(Obj);
 127
 128   yaml::Output Yout(Out);
 129   Yout << Dumper.getYAMLObj();
 130
 131   return object::object_error::success;
 132 }