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 #include <list>
  17
  18 using namespace llvm;
  19
  20 namespace {
  21
  22 class COFFDumper {
  23   const object::COFFObjectFile &Obj;
  24   COFFYAML::Object YAMLObj;
  25   void dumpHeader(const object::coff_file_header *Header);
  26   void dumpSections(unsigned numSections);
  27   void dumpSymbols(unsigned numSymbols);
  28   StringRef getHexString(ArrayRef<uint8_t> Data);
  29   std::list<std::string> Strings;
  30
  31 public:
  32   COFFDumper(const object::COFFObjectFile &Obj);
  33   COFFYAML::Object &getYAMLObj();
  34 };
  35
  36 }
  37
  38 static void check(error_code ec) {
  39   if (ec)
  40     report_fatal_error(ec.message());
  41 }
  42
  43 COFFDumper::COFFDumper(const object::COFFObjectFile &Obj) : Obj(Obj) {
  44   const object::coff_file_header *Header;
  45   check(Obj.getHeader(Header));
  46   dumpHeader(Header);
  47   dumpSections(Header->NumberOfSections);
  48   dumpSymbols(Header->NumberOfSymbols);
  49 }
  50
  51 void COFFDumper::dumpHeader(const object::coff_file_header *Header) {
  52   YAMLObj.Header.Machine = Header->Machine;
  53   YAMLObj.Header.Characteristics = Header->Characteristics;
  54 }
  55
  56 void COFFDumper::dumpSections(unsigned NumSections) {
  57   std::vector<COFFYAML::Section> &Sections = YAMLObj.Sections;
  58   error_code ec;
  59   for (object::section_iterator iter = Obj.begin_sections();
  60        iter != Obj.end_sections(); iter.increment(ec)) {
  61     check(ec);
  62     const object::coff_section *Sect = Obj.getCOFFSection(iter);
  63     COFFYAML::Section Sec;
  64     Sec.Name = Sect->Name; // FIXME: check the null termination!
  65     uint32_t Characteristics = Sect->Characteristics;
  66     Sec.Header.Characteristics = Characteristics;
  67     Sec.Alignment = 1 << (((Characteristics >> 20) & 0xf) - 1);
  68
  69     ArrayRef<uint8_t> sectionData;
  70     Obj.getSectionContents(Sect, sectionData);
  71     Sec.SectionData = getHexString(sectionData);
  72
  73     std::vector<COFF::relocation> Relocations;
  74     for (object::relocation_iterator rIter = iter->begin_relocations();
  75                        rIter != iter->end_relocations(); rIter.increment(ec)) {
  76       const object::coff_relocation *reloc = Obj.getCOFFRelocation(rIter);
  77       COFF::relocation Rel;
  78       Rel.VirtualAddress = reloc->VirtualAddress;
  79       Rel.SymbolTableIndex = reloc->SymbolTableIndex;
  80       Rel.Type = reloc->Type;
  81       Relocations.push_back(Rel);
  82     }
  83     Sec.Relocations = Relocations;
  84     Sections.push_back(Sec);
  85   }
  86 }
  87
  88 void COFFDumper::dumpSymbols(unsigned NumSymbols) {
  89   error_code ec;
  90   std::vector<COFFYAML::Symbol> &Symbols = YAMLObj.Symbols;
  91   for (object::symbol_iterator iter = Obj.begin_symbols();
  92        iter != Obj.end_symbols(); iter.increment(ec)) {
  93     check(ec);
  94     const object::coff_symbol *Symbol = Obj.getCOFFSymbol(iter);
  95     COFFYAML::Symbol Sym;
  96     Obj.getSymbolName(Symbol, Sym.Name);
  97     Sym.SimpleType = COFF::SymbolBaseType(Symbol->getBaseType());
  98     Sym.ComplexType = COFF::SymbolComplexType(Symbol->getComplexType());
  99     Sym.Header.StorageClass = Symbol->StorageClass;
 100     Sym.Header.Value = Symbol->Value;
 101     Sym.Header.SectionNumber = Symbol->SectionNumber;
 102     Sym.Header.NumberOfAuxSymbols = Symbol->NumberOfAuxSymbols;
 103     Sym.AuxiliaryData = getHexString(Obj.getSymbolAuxData(Symbol));
 104     Symbols.push_back(Sym);
 105   }
 106 }
 107
 108 StringRef COFFDumper::getHexString(ArrayRef<uint8_t> Data) {
 109   std::string S;
 110   for (ArrayRef<uint8_t>::iterator I = Data.begin(), E = Data.end(); I != E;
 111        ++I) {
 112     uint8_t Byte = *I;
 113     S.push_back(hexdigit(Byte >> 4));
 114     S.push_back(hexdigit(Byte & 0xf));
 115   }
 116   Strings.push_back(S);
 117   return Strings.back();
 118 }
 119
 120 COFFYAML::Object &COFFDumper::getYAMLObj() {
 121   return YAMLObj;
 122 }
 123
 124 error_code coff2yaml(raw_ostream &Out, MemoryBuffer *Buff) {
 125   error_code ec;
 126   object::COFFObjectFile Obj(Buff, ec);
 127   check(ec);
 128   COFFDumper Dumper(Obj);
 129
 130   yaml::Output Yout(Out);
 131   Yout << Dumper.getYAMLObj();
 132
 133   return object::object_error::success;
 134 }