Use a scheme closer to that of GNU as when deciding the type of a
[oota-llvm.git] / tools / llvm-readobj / MachODumper.cpp
1 //===-- MachODump.cpp - Object file dumping utility for llvm --------------===//
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 // This file implements the MachO-specific dumper for llvm-readobj.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "llvm-readobj.h"
15 #include "Error.h"
16 #include "ObjDumper.h"
17 #include "StreamWriter.h"
18
19 #include "llvm/ADT/SmallString.h"
20 #include "llvm/Object/MachO.h"
21 #include "llvm/Support/Casting.h"
22
23 using namespace llvm;
24 using namespace object;
25
26 namespace {
27
28 class MachODumper : public ObjDumper {
29 public:
30   MachODumper(const llvm::object::MachOObjectFileBase *Obj, StreamWriter& Writer)
31     : ObjDumper(Writer)
32     , Obj(Obj) { }
33
34   virtual void printFileHeaders() LLVM_OVERRIDE;
35   virtual void printSections() LLVM_OVERRIDE;
36   virtual void printRelocations() LLVM_OVERRIDE;
37   virtual void printSymbols() LLVM_OVERRIDE;
38   virtual void printDynamicSymbols() LLVM_OVERRIDE;
39   virtual void printUnwindInfo() LLVM_OVERRIDE;
40
41 private:
42   void printSymbol(symbol_iterator SymI);
43
44   void printRelocation(section_iterator SecI, relocation_iterator RelI);
45
46   const llvm::object::MachOObjectFileBase *Obj;
47 };
48
49 } // namespace
50
51
52 namespace llvm {
53
54 error_code createMachODumper(const object::ObjectFile *Obj,
55                              StreamWriter& Writer,
56                              OwningPtr<ObjDumper> &Result) {
57   const MachOObjectFileBase *MachOObj = dyn_cast<MachOObjectFileBase>(Obj);
58   if (!MachOObj)
59     return readobj_error::unsupported_obj_file_format;
60
61   Result.reset(new MachODumper(MachOObj, Writer));
62   return readobj_error::success;
63 }
64
65 } // namespace llvm
66
67
68 static const EnumEntry<unsigned> MachOSectionTypes[] = {
69   { "Regular"                        , 0x00 },
70   { "ZeroFill"                       , 0x01 },
71   { "CStringLiterals"                , 0x02 },
72   { "4ByteLiterals"                  , 0x03 },
73   { "8ByteLiterals"                  , 0x04 },
74   { "LiteralPointers"                , 0x05 },
75   { "NonLazySymbolPointers"          , 0x06 },
76   { "LazySymbolPointers"             , 0x07 },
77   { "SymbolStubs"                    , 0x08 },
78   { "ModInitFuncs"                   , 0x09 },
79   { "ModTermFuncs"                   , 0x0A },
80   { "Coalesced"                      , 0x0B },
81   { "GBZeroFill"                     , 0x0C },
82   { "Interposing"                    , 0x0D },
83   { "16ByteLiterals"                 , 0x0E },
84   { "DTraceDOF"                      , 0x0F },
85   { "LazyDylibSymbolPoints"          , 0x10 },
86   { "ThreadLocalRegular"             , 0x11 },
87   { "ThreadLocalZerofill"            , 0x12 },
88   { "ThreadLocalVariables"           , 0x13 },
89   { "ThreadLocalVariablePointers"    , 0x14 },
90   { "ThreadLocalInitFunctionPointers", 0x15 }
91 };
92
93 static const EnumEntry<unsigned> MachOSectionAttributes[] = {
94   { "LocReloc"         , 1 <<  0 /*S_ATTR_LOC_RELOC          */ },
95   { "ExtReloc"         , 1 <<  1 /*S_ATTR_EXT_RELOC          */ },
96   { "SomeInstructions" , 1 <<  2 /*S_ATTR_SOME_INSTRUCTIONS  */ },
97   { "Debug"            , 1 << 17 /*S_ATTR_DEBUG              */ },
98   { "SelfModifyingCode", 1 << 18 /*S_ATTR_SELF_MODIFYING_CODE*/ },
99   { "LiveSupport"      , 1 << 19 /*S_ATTR_LIVE_SUPPORT       */ },
100   { "NoDeadStrip"      , 1 << 20 /*S_ATTR_NO_DEAD_STRIP      */ },
101   { "StripStaticSyms"  , 1 << 21 /*S_ATTR_STRIP_STATIC_SYMS  */ },
102   { "NoTOC"            , 1 << 22 /*S_ATTR_NO_TOC             */ },
103   { "PureInstructions" , 1 << 23 /*S_ATTR_PURE_INSTRUCTIONS  */ },
104 };
105
106 static const EnumEntry<unsigned> MachOSymbolRefTypes[] = {
107   { "UndefinedNonLazy",                     0 },
108   { "ReferenceFlagUndefinedLazy",           1 },
109   { "ReferenceFlagDefined",                 2 },
110   { "ReferenceFlagPrivateDefined",          3 },
111   { "ReferenceFlagPrivateUndefinedNonLazy", 4 },
112   { "ReferenceFlagPrivateUndefinedLazy",    5 }
113 };
114
115 static const EnumEntry<unsigned> MachOSymbolFlags[] = {
116   { "ReferencedDynamically", 0x10 },
117   { "NoDeadStrip",           0x20 },
118   { "WeakRef",               0x40 },
119   { "WeakDef",               0x80 }
120 };
121
122 static const EnumEntry<unsigned> MachOSymbolTypes[] = {
123   { "Undef",           0x0 },
124   { "External",        0x1 },
125   { "Abs",             0x2 },
126   { "Indirect",        0xA },
127   { "PreboundUndef",   0xC },
128   { "Section",         0xE },
129   { "PrivateExternal", 0x10 }
130 };
131
132 namespace {
133   enum {
134     N_STAB = 0xE0
135   };
136
137   struct MachOSection {
138     ArrayRef<char> Name;
139     ArrayRef<char> SegmentName;
140     uint64_t Address;
141     uint64_t Size;
142     uint32_t Offset;
143     uint32_t Alignment;
144     uint32_t RelocationTableOffset;
145     uint32_t NumRelocationTableEntries;
146     uint32_t Flags;
147     uint32_t Reserved1;
148     uint32_t Reserved2;
149   };
150
151   struct MachOSymbol {
152     uint32_t StringIndex;
153     uint8_t Type;
154     uint8_t SectionIndex;
155     uint16_t Flags;
156     uint64_t Value;
157   };
158 }
159
160 static void getSection(const MachOObjectFileBase *Obj,
161                        DataRefImpl DRI,
162                        MachOSection &Section) {
163   if (const MachOObjectFile64Le *O = dyn_cast<MachOObjectFile64Le>(Obj)) {
164     const MachOObjectFile64Le::Section *Sect = O->getSection(DRI);
165
166     Section.Address     = Sect->Address;
167     Section.Size        = Sect->Size;
168     Section.Offset      = Sect->Offset;
169     Section.Alignment   = Sect->Align;
170     Section.RelocationTableOffset = Sect->RelocationTableOffset;
171     Section.NumRelocationTableEntries = Sect->NumRelocationTableEntries;
172     Section.Flags       = Sect->Flags;
173     Section.Reserved1   = Sect->Reserved1;
174     Section.Reserved2   = Sect->Reserved2;
175   } else {
176     const MachOObjectFile32Le *O2 = cast<MachOObjectFile32Le>(Obj);
177     const MachOObjectFile32Le::Section *Sect = O2->getSection(DRI);
178
179     Section.Address     = Sect->Address;
180     Section.Size        = Sect->Size;
181     Section.Offset      = Sect->Offset;
182     Section.Alignment   = Sect->Align;
183     Section.RelocationTableOffset = Sect->RelocationTableOffset;
184     Section.NumRelocationTableEntries = Sect->NumRelocationTableEntries;
185     Section.Flags       = Sect->Flags;
186     Section.Reserved1   = Sect->Reserved1;
187     Section.Reserved2   = Sect->Reserved2;
188   }
189 }
190
191 static void getSymbol(const MachOObjectFileBase *Obj,
192                       DataRefImpl DRI,
193                       MachOSymbol &Symbol) {
194   if (const MachOObjectFile64Le *O = dyn_cast<MachOObjectFile64Le>(Obj)) {
195     const MachOObjectFile64Le::SymbolTableEntry *Entry =
196       O->getSymbolTableEntry(DRI);
197     Symbol.StringIndex  = Entry->StringIndex;
198     Symbol.Type         = Entry->Type;
199     Symbol.SectionIndex = Entry->SectionIndex;
200     Symbol.Flags        = Entry->Flags;
201     Symbol.Value        = Entry->Value;
202   } else {
203     const MachOObjectFile32Le *O2 = cast<MachOObjectFile32Le>(Obj);
204     const MachOObjectFile32Le::SymbolTableEntry *Entry =
205       O2->getSymbolTableEntry(DRI);
206     Symbol.StringIndex  = Entry->StringIndex;
207     Symbol.Type         = Entry->Type;
208     Symbol.SectionIndex = Entry->SectionIndex;
209     Symbol.Flags        = Entry->Flags;
210     Symbol.Value        = Entry->Value;
211   }
212 }
213
214 void MachODumper::printFileHeaders() {
215   W.startLine() << "FileHeaders not implemented.\n";
216 }
217
218 void MachODumper::printSections() {
219   ListScope Group(W, "Sections");
220
221   int SectionIndex = -1;
222   error_code EC;
223   for (section_iterator SecI = Obj->begin_sections(),
224                         SecE = Obj->end_sections();
225                         SecI != SecE; SecI.increment(EC)) {
226     if (error(EC)) break;
227
228     ++SectionIndex;
229
230     MachOSection Section;
231     getSection(Obj, SecI->getRawDataRefImpl(), Section);
232     DataRefImpl DR = SecI->getRawDataRefImpl();
233
234     StringRef Name;
235     if (error(SecI->getName(Name)))
236         Name = "";
237
238     ArrayRef<char> RawName = Obj->getSectionRawName(DR);
239     StringRef SegmentName = Obj->getSectionFinalSegmentName(DR);
240     ArrayRef<char> RawSegmentName = Obj->getSectionRawFinalSegmentName(DR);
241
242     DictScope SectionD(W, "Section");
243     W.printNumber("Index", SectionIndex);
244     W.printBinary("Name", Name, RawName);
245     W.printBinary("Segment", SegmentName, RawSegmentName);
246     W.printHex   ("Address", Section.Address);
247     W.printHex   ("Size", Section.Size);
248     W.printNumber("Offset", Section.Offset);
249     W.printNumber("Alignment", Section.Alignment);
250     W.printHex   ("RelocationOffset", Section.RelocationTableOffset);
251     W.printNumber("RelocationCount", Section.NumRelocationTableEntries);
252     W.printEnum  ("Type", Section.Flags & 0xFF,
253                   makeArrayRef(MachOSectionAttributes));
254     W.printFlags ("Attributes", Section.Flags >> 8,
255                   makeArrayRef(MachOSectionAttributes));
256     W.printHex   ("Reserved1", Section.Reserved1);
257     W.printHex   ("Reserved2", Section.Reserved2);
258
259     if (opts::SectionRelocations) {
260       ListScope D(W, "Relocations");
261       for (relocation_iterator RelI = SecI->begin_relocations(),
262                                RelE = SecI->end_relocations();
263                                RelI != RelE; RelI.increment(EC)) {
264         if (error(EC)) break;
265
266         printRelocation(SecI, RelI);
267       }
268     }
269
270     if (opts::SectionSymbols) {
271       ListScope D(W, "Symbols");
272       for (symbol_iterator SymI = Obj->begin_symbols(),
273                            SymE = Obj->end_symbols();
274                            SymI != SymE; SymI.increment(EC)) {
275         if (error(EC)) break;
276
277         bool Contained = false;
278         if (SecI->containsSymbol(*SymI, Contained) || !Contained)
279           continue;
280
281         printSymbol(SymI);
282       }
283     }
284
285     if (opts::SectionData) {
286       StringRef Data;
287       if (error(SecI->getContents(Data))) break;
288
289       W.printBinaryBlock("SectionData", Data);
290     }
291   }
292 }
293
294 void MachODumper::printRelocations() {
295   ListScope D(W, "Relocations");
296
297   error_code EC;
298   for (section_iterator SecI = Obj->begin_sections(),
299                         SecE = Obj->end_sections();
300                         SecI != SecE; SecI.increment(EC)) {
301     if (error(EC)) break;
302
303     StringRef Name;
304     if (error(SecI->getName(Name)))
305       continue;
306
307     bool PrintedGroup = false;
308     for (relocation_iterator RelI = SecI->begin_relocations(),
309                              RelE = SecI->end_relocations();
310                              RelI != RelE; RelI.increment(EC)) {
311       if (error(EC)) break;
312
313       if (!PrintedGroup) {
314         W.startLine() << "Section " << Name << " {\n";
315         W.indent();
316         PrintedGroup = true;
317       }
318
319       printRelocation(SecI, RelI);
320     }
321
322     if (PrintedGroup) {
323       W.unindent();
324       W.startLine() << "}\n";
325     }
326   }
327 }
328
329 void MachODumper::printRelocation(section_iterator SecI,
330                                   relocation_iterator RelI) {
331   uint64_t Offset;
332   SmallString<32> RelocName;
333   int64_t Info;
334   StringRef SymbolName;
335   SymbolRef Symbol;
336   if (error(RelI->getOffset(Offset))) return;
337   if (error(RelI->getTypeName(RelocName))) return;
338   if (error(RelI->getAdditionalInfo(Info))) return;
339   if (error(RelI->getSymbol(Symbol))) return;
340   if (error(Symbol.getName(SymbolName))) return;
341
342   raw_ostream& OS = W.startLine();
343   OS << W.hex(Offset)
344      << " " << RelocName
345      << " " << (SymbolName.size() > 0 ? SymbolName : "-")
346      << " " << W.hex(Info)
347      << "\n";
348 }
349
350 void MachODumper::printSymbols() {
351   ListScope Group(W, "Symbols");
352
353   error_code EC;
354   for (symbol_iterator SymI = Obj->begin_symbols(),
355                        SymE = Obj->end_symbols();
356                        SymI != SymE; SymI.increment(EC)) {
357     if (error(EC)) break;
358
359     printSymbol(SymI);
360   }
361 }
362
363 void MachODumper::printDynamicSymbols() {
364   ListScope Group(W, "DynamicSymbols");
365 }
366
367 void MachODumper::printSymbol(symbol_iterator SymI) {
368   error_code EC;
369
370   StringRef SymbolName;
371   if (SymI->getName(SymbolName))
372     SymbolName = "";
373
374   MachOSymbol Symbol;
375   getSymbol(Obj, SymI->getRawDataRefImpl(), Symbol);
376
377   StringRef SectionName;
378   section_iterator SecI(Obj->end_sections());
379   if (error(SymI->getSection(SecI)) ||
380       error(SecI->getName(SectionName)))
381     SectionName = "";
382
383   DictScope D(W, "Symbol");
384   W.printNumber("Name", SymbolName, Symbol.StringIndex);
385   if (Symbol.Type & N_STAB) {
386     W.printHex ("Type", "SymDebugTable", Symbol.Type);
387   } else {
388     W.printEnum("Type", Symbol.Type, makeArrayRef(MachOSymbolTypes));
389   }
390   W.printHex   ("Section", SectionName, Symbol.SectionIndex);
391   W.printEnum  ("RefType", static_cast<uint16_t>(Symbol.Flags & 0xF),
392                   makeArrayRef(MachOSymbolRefTypes));
393   W.printFlags ("Flags", static_cast<uint16_t>(Symbol.Flags & ~0xF),
394                   makeArrayRef(MachOSymbolFlags));
395   W.printHex   ("Value", Symbol.Value);
396 }
397
398 void MachODumper::printUnwindInfo() {
399   W.startLine() << "UnwindInfo not implemented.\n";
400 }