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 
27 public:
28   COFFDumper(const object::COFFObjectFile &Obj);
29   COFFYAML::Object &getYAMLObj();
30 };
31 
32 }
33 
34 static void check(error_code ec) {
35   if (ec)
36     report_fatal_error(ec.message());
37 }
38 
39 COFFDumper::COFFDumper(const object::COFFObjectFile &Obj) : Obj(Obj) {
40   const object::coff_file_header *Header;
41   check(Obj.getCOFFHeader(Header));
42   dumpHeader(Header);
43   dumpSections(Header->NumberOfSections);
44   dumpSymbols(Header->NumberOfSymbols);
45 }
46 
47 void COFFDumper::dumpHeader(const object::coff_file_header *Header) {
48   YAMLObj.Header.Machine = Header->Machine;
49   YAMLObj.Header.Characteristics = Header->Characteristics;
50 }
51 
52 void COFFDumper::dumpSections(unsigned NumSections) {
53   std::vector<COFFYAML::Section> &Sections = YAMLObj.Sections;
54   for (object::section_iterator iter = Obj.section_begin();
55        iter != Obj.section_end(); ++iter) {
56     const object::coff_section *Sect = Obj.getCOFFSection(iter);
57     COFFYAML::Section Sec;
58     Sec.Name = Sect->Name; // FIXME: check the null termination!
59     uint32_t Characteristics = Sect->Characteristics;
60     Sec.Header.Characteristics = Characteristics;
61     Sec.Alignment = 1 << (((Characteristics >> 20) & 0xf) - 1);
62 
63     ArrayRef<uint8_t> sectionData;
64     Obj.getSectionContents(Sect, sectionData);
65     Sec.SectionData = object::yaml::BinaryRef(sectionData);
66 
67     std::vector<COFFYAML::Relocation> Relocations;
68     for (object::relocation_iterator rIter = iter->relocation_begin();
69                        rIter != iter->relocation_end(); ++rIter) {
70       const object::coff_relocation *reloc = Obj.getCOFFRelocation(rIter);
71       COFFYAML::Relocation Rel;
72       object::symbol_iterator Sym = rIter->getSymbol();
73       Sym->getName(Rel.SymbolName);
74       Rel.VirtualAddress = reloc->VirtualAddress;
75       Rel.Type = reloc->Type;
76       Relocations.push_back(Rel);
77     }
78     Sec.Relocations = Relocations;
79     Sections.push_back(Sec);
80   }
81 }
82 
83 void COFFDumper::dumpSymbols(unsigned NumSymbols) {
84   std::vector<COFFYAML::Symbol> &Symbols = YAMLObj.Symbols;
85   for (object::symbol_iterator iter = Obj.symbol_begin();
86        iter != Obj.symbol_end(); ++iter) {
87     const object::coff_symbol *Symbol = Obj.getCOFFSymbol(iter);
88     COFFYAML::Symbol Sym;
89     Obj.getSymbolName(Symbol, Sym.Name);
90     Sym.SimpleType = COFF::SymbolBaseType(Symbol->getBaseType());
91     Sym.ComplexType = COFF::SymbolComplexType(Symbol->getComplexType());
92     Sym.Header.StorageClass = Symbol->StorageClass;
93     Sym.Header.Value = Symbol->Value;
94     Sym.Header.SectionNumber = Symbol->SectionNumber;
95     Sym.Header.NumberOfAuxSymbols = Symbol->NumberOfAuxSymbols;
96     Sym.AuxiliaryData = object::yaml::BinaryRef(Obj.getSymbolAuxData(Symbol));
97     Symbols.push_back(Sym);
98   }
99 }
100 
101 COFFYAML::Object &COFFDumper::getYAMLObj() {
102   return YAMLObj;
103 }
104 
105 error_code coff2yaml(raw_ostream &Out, MemoryBuffer *Buff) {
106   error_code ec;
107   object::COFFObjectFile Obj(Buff, ec);
108   check(ec);
109   COFFDumper Dumper(Obj);
110 
111   yaml::Output Yout(Out);
112   Yout << Dumper.getYAMLObj();
113 
114   return object::object_error::success;
115 }
116