ARMAttributeParser.cpp revision ebe69fe11e48d322045d5949c83283927a0d790b 
1//===--- ARMAttributeParser.cpp - ARM Attribute Information Printer -------===//
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 "ARMAttributeParser.h"
11#include "StreamWriter.h"
12#include "llvm/ADT/STLExtras.h"
13#include "llvm/ADT/StringExtras.h"
14#include "llvm/Support/LEB128.h"
15
16using namespace llvm;
17using namespace llvm::ARMBuildAttrs;
18
19
20static const EnumEntry<unsigned> TagNames[] = {
21  { "Tag_File", ARMBuildAttrs::File },
22  { "Tag_Section", ARMBuildAttrs::Section },
23  { "Tag_Symbol", ARMBuildAttrs::Symbol },
24};
25
26namespace llvm {
27#define ATTRIBUTE_HANDLER(Attr_)                                                \
28  { ARMBuildAttrs::Attr_, &ARMAttributeParser::Attr_ }
29
30const ARMAttributeParser::DisplayHandler
31ARMAttributeParser::DisplayRoutines[] = {
32  { ARMBuildAttrs::CPU_raw_name, &ARMAttributeParser::StringAttribute, },
33  { ARMBuildAttrs::CPU_name, &ARMAttributeParser::StringAttribute },
34  ATTRIBUTE_HANDLER(CPU_arch),
35  ATTRIBUTE_HANDLER(CPU_arch_profile),
36  ATTRIBUTE_HANDLER(ARM_ISA_use),
37  ATTRIBUTE_HANDLER(THUMB_ISA_use),
38  ATTRIBUTE_HANDLER(FP_arch),
39  ATTRIBUTE_HANDLER(WMMX_arch),
40  ATTRIBUTE_HANDLER(Advanced_SIMD_arch),
41  ATTRIBUTE_HANDLER(PCS_config),
42  ATTRIBUTE_HANDLER(ABI_PCS_R9_use),
43  ATTRIBUTE_HANDLER(ABI_PCS_RW_data),
44  ATTRIBUTE_HANDLER(ABI_PCS_RO_data),
45  ATTRIBUTE_HANDLER(ABI_PCS_GOT_use),
46  ATTRIBUTE_HANDLER(ABI_PCS_wchar_t),
47  ATTRIBUTE_HANDLER(ABI_FP_rounding),
48  ATTRIBUTE_HANDLER(ABI_FP_denormal),
49  ATTRIBUTE_HANDLER(ABI_FP_exceptions),
50  ATTRIBUTE_HANDLER(ABI_FP_user_exceptions),
51  ATTRIBUTE_HANDLER(ABI_FP_number_model),
52  ATTRIBUTE_HANDLER(ABI_align_needed),
53  ATTRIBUTE_HANDLER(ABI_align_preserved),
54  ATTRIBUTE_HANDLER(ABI_enum_size),
55  ATTRIBUTE_HANDLER(ABI_HardFP_use),
56  ATTRIBUTE_HANDLER(ABI_VFP_args),
57  ATTRIBUTE_HANDLER(ABI_WMMX_args),
58  ATTRIBUTE_HANDLER(ABI_optimization_goals),
59  ATTRIBUTE_HANDLER(ABI_FP_optimization_goals),
60  ATTRIBUTE_HANDLER(compatibility),
61  ATTRIBUTE_HANDLER(CPU_unaligned_access),
62  ATTRIBUTE_HANDLER(FP_HP_extension),
63  ATTRIBUTE_HANDLER(ABI_FP_16bit_format),
64  ATTRIBUTE_HANDLER(MPextension_use),
65  ATTRIBUTE_HANDLER(DIV_use),
66  ATTRIBUTE_HANDLER(T2EE_use),
67  ATTRIBUTE_HANDLER(Virtualization_use),
68  ATTRIBUTE_HANDLER(nodefaults)
69};
70
71#undef ATTRIBUTE_HANDLER
72
73uint64_t ARMAttributeParser::ParseInteger(const uint8_t *Data,
74                                          uint32_t &Offset) {
75  unsigned Length;
76  uint64_t Value = decodeULEB128(Data + Offset, &Length);
77  Offset = Offset + Length;
78  return Value;
79}
80
81StringRef ARMAttributeParser::ParseString(const uint8_t *Data,
82                                          uint32_t &Offset) {
83  const char *String = reinterpret_cast<const char*>(Data + Offset);
84  size_t Length = std::strlen(String);
85  Offset = Offset + Length + 1;
86  return StringRef(String, Length);
87}
88
89void ARMAttributeParser::IntegerAttribute(AttrType Tag, const uint8_t *Data,
90                                          uint32_t &Offset) {
91  SW.printNumber(ARMBuildAttrs::AttrTypeAsString(Tag),
92                 ParseInteger(Data, Offset));
93}
94
95void ARMAttributeParser::StringAttribute(AttrType Tag, const uint8_t *Data,
96                                         uint32_t &Offset) {
97  StringRef TagName = ARMBuildAttrs::AttrTypeAsString(Tag, /*TagPrefix*/false);
98
99  DictScope AS(SW, "Attribute");
100  SW.printNumber("Tag", Tag);
101  if (!TagName.empty())
102    SW.printString("TagName", TagName);
103  SW.printString("Value", ParseString(Data, Offset));
104}
105
106void ARMAttributeParser::PrintAttribute(unsigned Tag, unsigned Value,
107                                        StringRef ValueDesc) {
108  StringRef TagName = ARMBuildAttrs::AttrTypeAsString(Tag, /*TagPrefix*/false);
109
110  DictScope AS(SW, "Attribute");
111  SW.printNumber("Tag", Tag);
112  SW.printNumber("Value", Value);
113  if (!TagName.empty())
114    SW.printString("TagName", TagName);
115  if (!ValueDesc.empty())
116    SW.printString("Description", ValueDesc);
117}
118
119void ARMAttributeParser::CPU_arch(AttrType Tag, const uint8_t *Data,
120                                  uint32_t &Offset) {
121  static const char *Strings[] = {
122    "Pre-v4", "ARM v4", "ARM v4T", "ARM v5T", "ARM v5TE", "ARM v5TEJ", "ARM v6",
123    "ARM v6KZ", "ARM v6T2", "ARM v6K", "ARM v7", "ARM v6-M", "ARM v6S-M",
124    "ARM v7E-M", "ARM v8"
125  };
126
127  uint64_t Value = ParseInteger(Data, Offset);
128  StringRef ValueDesc =
129    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
130  PrintAttribute(Tag, Value, ValueDesc);
131}
132
133void ARMAttributeParser::CPU_arch_profile(AttrType Tag, const uint8_t *Data,
134                                          uint32_t &Offset) {
135  uint64_t Encoded = ParseInteger(Data, Offset);
136
137  StringRef Profile;
138  switch (Encoded) {
139  default:  Profile = "Unknown"; break;
140  case 'A': Profile = "Application"; break;
141  case 'R': Profile = "Real-time"; break;
142  case 'M': Profile = "Microcontroller"; break;
143  case 'S': Profile = "Classic"; break;
144  case 0: Profile = "None"; break;
145  }
146
147  PrintAttribute(Tag, Encoded, Profile);
148}
149
150void ARMAttributeParser::ARM_ISA_use(AttrType Tag, const uint8_t *Data,
151                                     uint32_t &Offset) {
152  static const char *Strings[] = { "Not Permitted", "Permitted" };
153
154  uint64_t Value = ParseInteger(Data, Offset);
155  StringRef ValueDesc =
156    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
157  PrintAttribute(Tag, Value, ValueDesc);
158}
159
160void ARMAttributeParser::THUMB_ISA_use(AttrType Tag, const uint8_t *Data,
161                                       uint32_t &Offset) {
162  static const char *Strings[] = { "Not Permitted", "Thumb-1", "Thumb-2" };
163
164  uint64_t Value = ParseInteger(Data, Offset);
165  StringRef ValueDesc =
166    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
167  PrintAttribute(Tag, Value, ValueDesc);
168}
169
170void ARMAttributeParser::FP_arch(AttrType Tag, const uint8_t *Data,
171                                 uint32_t &Offset) {
172  static const char *Strings[] = {
173    "Not Permitted", "VFPv1", "VFPv2", "VFPv3", "VFPv3-D16", "VFPv4",
174    "VFPv4-D16", "ARMv8-a FP", "ARMv8-a FP-D16"
175  };
176
177  uint64_t Value = ParseInteger(Data, Offset);
178  StringRef ValueDesc =
179    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
180  PrintAttribute(Tag, Value, ValueDesc);
181}
182
183void ARMAttributeParser::WMMX_arch(AttrType Tag, const uint8_t *Data,
184                                   uint32_t &Offset) {
185  static const char *Strings[] = { "Not Permitted", "WMMXv1", "WMMXv2" };
186
187  uint64_t Value = ParseInteger(Data, Offset);
188  StringRef ValueDesc =
189    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
190  PrintAttribute(Tag, Value, ValueDesc);
191}
192
193void ARMAttributeParser::Advanced_SIMD_arch(AttrType Tag, const uint8_t *Data,
194                                            uint32_t &Offset) {
195  static const char *Strings[] = {
196    "Not Permitted", "NEONv1", "NEONv2+FMA", "ARMv8-a NEON"
197  };
198
199  uint64_t Value = ParseInteger(Data, Offset);
200  StringRef ValueDesc =
201    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
202  PrintAttribute(Tag, Value, ValueDesc);
203}
204
205void ARMAttributeParser::PCS_config(AttrType Tag, const uint8_t *Data,
206                                    uint32_t &Offset) {
207  static const char *Strings[] = {
208    "None", "Bare Platform", "Linux Application", "Linux DSO", "Palm OS 2004",
209    "Reserved (Palm OS)", "Symbian OS 2004", "Reserved (Symbian OS)"
210  };
211
212  uint64_t Value = ParseInteger(Data, Offset);
213  StringRef ValueDesc =
214    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
215  PrintAttribute(Tag, Value, ValueDesc);
216}
217
218void ARMAttributeParser::ABI_PCS_R9_use(AttrType Tag, const uint8_t *Data,
219                                        uint32_t &Offset) {
220  static const char *Strings[] = { "v6", "Static Base", "TLS", "Unused" };
221
222  uint64_t Value = ParseInteger(Data, Offset);
223  StringRef ValueDesc =
224    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
225  PrintAttribute(Tag, Value, ValueDesc);
226}
227
228void ARMAttributeParser::ABI_PCS_RW_data(AttrType Tag, const uint8_t *Data,
229                                         uint32_t &Offset) {
230  static const char *Strings[] = {
231    "Absolute", "PC-relative", "SB-relative", "Not Permitted"
232  };
233
234  uint64_t Value = ParseInteger(Data, Offset);
235  StringRef ValueDesc =
236    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
237  PrintAttribute(Tag, Value, ValueDesc);
238}
239
240void ARMAttributeParser::ABI_PCS_RO_data(AttrType Tag, const uint8_t *Data,
241                                         uint32_t &Offset) {
242  static const char *Strings[] = { "Absolute", "PC-relative", "Not Permitted" };
243
244  uint64_t Value = ParseInteger(Data, Offset);
245  StringRef ValueDesc =
246    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
247  PrintAttribute(Tag, Value, ValueDesc);
248}
249
250void ARMAttributeParser::ABI_PCS_GOT_use(AttrType Tag, const uint8_t *Data,
251                                         uint32_t &Offset) {
252  static const char *Strings[] = { "Not Permitted", "Direct", "GOT-Indirect" };
253
254  uint64_t Value = ParseInteger(Data, Offset);
255  StringRef ValueDesc =
256    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
257  PrintAttribute(Tag, Value, ValueDesc);
258}
259
260void ARMAttributeParser::ABI_PCS_wchar_t(AttrType Tag, const uint8_t *Data,
261                                         uint32_t &Offset) {
262  static const char *Strings[] = {
263    "Not Permitted", "Unknown", "2-byte", "Unknown", "4-byte"
264  };
265
266  uint64_t Value = ParseInteger(Data, Offset);
267  StringRef ValueDesc =
268    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
269  PrintAttribute(Tag, Value, ValueDesc);
270}
271
272void ARMAttributeParser::ABI_FP_rounding(AttrType Tag, const uint8_t *Data,
273                                         uint32_t &Offset) {
274  static const char *Strings[] = { "IEEE-754", "Runtime" };
275
276  uint64_t Value = ParseInteger(Data, Offset);
277  StringRef ValueDesc =
278    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
279  PrintAttribute(Tag, Value, ValueDesc);
280}
281
282void ARMAttributeParser::ABI_FP_denormal(AttrType Tag, const uint8_t *Data,
283                                         uint32_t &Offset) {
284  static const char *Strings[] = { "Unsupported", "IEEE-754", "Sign Only" };
285
286  uint64_t Value = ParseInteger(Data, Offset);
287  StringRef ValueDesc =
288    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
289  PrintAttribute(Tag, Value, ValueDesc);
290}
291
292void ARMAttributeParser::ABI_FP_exceptions(AttrType Tag, const uint8_t *Data,
293                                           uint32_t &Offset) {
294  static const char *Strings[] = { "Not Permitted", "IEEE-754" };
295
296  uint64_t Value = ParseInteger(Data, Offset);
297  StringRef ValueDesc =
298    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
299  PrintAttribute(Tag, Value, ValueDesc);
300}
301
302void ARMAttributeParser::ABI_FP_user_exceptions(AttrType Tag,
303                                                const uint8_t *Data,
304                                                uint32_t &Offset) {
305  static const char *Strings[] = { "Not Permitted", "IEEE-754" };
306
307  uint64_t Value = ParseInteger(Data, Offset);
308  StringRef ValueDesc =
309    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
310  PrintAttribute(Tag, Value, ValueDesc);
311}
312
313void ARMAttributeParser::ABI_FP_number_model(AttrType Tag, const uint8_t *Data,
314                                             uint32_t &Offset) {
315  static const char *Strings[] = {
316    "Not Permitted", "Finite Only", "RTABI", "IEEE-754"
317  };
318
319  uint64_t Value = ParseInteger(Data, Offset);
320  StringRef ValueDesc =
321    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
322  PrintAttribute(Tag, Value, ValueDesc);
323}
324
325void ARMAttributeParser::ABI_align_needed(AttrType Tag, const uint8_t *Data,
326                                          uint32_t &Offset) {
327  static const char *Strings[] = {
328    "Not Permitted", "8-byte alignment", "4-byte alignment", "Reserved"
329  };
330
331  uint64_t Value = ParseInteger(Data, Offset);
332
333  std::string Description;
334  if (Value < array_lengthof(Strings))
335    Description = std::string(Strings[Value]);
336  else if (Value <= 12)
337    Description = std::string("8-byte alignment, ") + utostr(1 << Value)
338                + std::string("-byte extended alignment");
339  else
340    Description = "Invalid";
341
342  PrintAttribute(Tag, Value, Description);
343}
344
345void ARMAttributeParser::ABI_align_preserved(AttrType Tag, const uint8_t *Data,
346                                             uint32_t &Offset) {
347  static const char *Strings[] = {
348    "Not Required", "8-byte data alignment", "8-byte data and code alignment",
349    "Reserved"
350  };
351
352  uint64_t Value = ParseInteger(Data, Offset);
353
354  std::string Description;
355  if (Value < array_lengthof(Strings))
356    Description = std::string(Strings[Value]);
357  else if (Value <= 12)
358    Description = std::string("8-byte stack alignment, ") + utostr(1 << Value)
359                + std::string("-byte data alignment");
360  else
361    Description = "Invalid";
362
363  PrintAttribute(Tag, Value, Description);
364}
365
366void ARMAttributeParser::ABI_enum_size(AttrType Tag, const uint8_t *Data,
367                                       uint32_t &Offset) {
368  static const char *Strings[] = {
369    "Not Permitted", "Packed", "Int32", "External Int32"
370  };
371
372  uint64_t Value = ParseInteger(Data, Offset);
373  StringRef ValueDesc =
374    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
375  PrintAttribute(Tag, Value, ValueDesc);
376}
377
378void ARMAttributeParser::ABI_HardFP_use(AttrType Tag, const uint8_t *Data,
379                                        uint32_t &Offset) {
380  static const char *Strings[] = {
381    "Tag_FP_arch", "Single-Precision", "Reserved", "Tag_FP_arch (deprecated)"
382  };
383
384  uint64_t Value = ParseInteger(Data, Offset);
385  StringRef ValueDesc =
386    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
387  PrintAttribute(Tag, Value, ValueDesc);
388}
389
390void ARMAttributeParser::ABI_VFP_args(AttrType Tag, const uint8_t *Data,
391                                      uint32_t &Offset) {
392  static const char *Strings[] = {
393    "AAPCS", "AAPCS VFP", "Custom", "Not Permitted"
394  };
395
396  uint64_t Value = ParseInteger(Data, Offset);
397  StringRef ValueDesc =
398    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
399  PrintAttribute(Tag, Value, ValueDesc);
400}
401
402void ARMAttributeParser::ABI_WMMX_args(AttrType Tag, const uint8_t *Data,
403                                       uint32_t &Offset) {
404  static const char *Strings[] = { "AAPCS", "iWMMX", "Custom" };
405
406  uint64_t Value = ParseInteger(Data, Offset);
407  StringRef ValueDesc =
408    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
409  PrintAttribute(Tag, Value, ValueDesc);
410}
411
412void ARMAttributeParser::ABI_optimization_goals(AttrType Tag,
413                                                const uint8_t *Data,
414                                                uint32_t &Offset) {
415  static const char *Strings[] = {
416    "None", "Speed", "Aggressive Speed", "Size", "Aggressive Size", "Debugging",
417    "Best Debugging"
418  };
419
420  uint64_t Value = ParseInteger(Data, Offset);
421  StringRef ValueDesc =
422    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
423  PrintAttribute(Tag, Value, ValueDesc);
424}
425
426void ARMAttributeParser::ABI_FP_optimization_goals(AttrType Tag,
427                                                   const uint8_t *Data,
428                                                   uint32_t &Offset) {
429  static const char *Strings[] = {
430    "None", "Speed", "Aggressive Speed", "Size", "Aggressive Size", "Accuracy",
431    "Best Accuracy"
432  };
433
434  uint64_t Value = ParseInteger(Data, Offset);
435  StringRef ValueDesc =
436    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
437  PrintAttribute(Tag, Value, ValueDesc);
438}
439
440void ARMAttributeParser::compatibility(AttrType Tag, const uint8_t *Data,
441                                       uint32_t &Offset) {
442  uint64_t Integer = ParseInteger(Data, Offset);
443  StringRef String = ParseString(Data, Offset);
444
445  DictScope AS(SW, "Attribute");
446  SW.printNumber("Tag", Tag);
447  SW.startLine() << "Value: " << Integer << ", " << String << '\n';
448  SW.printString("TagName", AttrTypeAsString(Tag, /*TagPrefix*/false));
449  switch (Integer) {
450  case 0:
451    SW.printString("Description", StringRef("No Specific Requirements"));
452    break;
453  case 1:
454    SW.printString("Description", StringRef("AEABI Conformant"));
455    break;
456  default:
457    SW.printString("Description", StringRef("AEABI Non-Conformant"));
458    break;
459  }
460}
461
462void ARMAttributeParser::CPU_unaligned_access(AttrType Tag, const uint8_t *Data,
463                                              uint32_t &Offset) {
464  static const char *Strings[] = { "Not Permitted", "v6-style" };
465
466  uint64_t Value = ParseInteger(Data, Offset);
467  StringRef ValueDesc =
468    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
469  PrintAttribute(Tag, Value, ValueDesc);
470}
471
472void ARMAttributeParser::FP_HP_extension(AttrType Tag, const uint8_t *Data,
473                                         uint32_t &Offset) {
474  static const char *Strings[] = { "If Available", "Permitted" };
475
476  uint64_t Value = ParseInteger(Data, Offset);
477  StringRef ValueDesc =
478    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
479  PrintAttribute(Tag, Value, ValueDesc);
480}
481
482void ARMAttributeParser::ABI_FP_16bit_format(AttrType Tag, const uint8_t *Data,
483                                             uint32_t &Offset) {
484  static const char *Strings[] = { "Not Permitted", "IEEE-754", "VFPv3" };
485
486  uint64_t Value = ParseInteger(Data, Offset);
487  StringRef ValueDesc =
488    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
489  PrintAttribute(Tag, Value, ValueDesc);
490}
491
492void ARMAttributeParser::MPextension_use(AttrType Tag, const uint8_t *Data,
493                                         uint32_t &Offset) {
494  static const char *Strings[] = { "Not Permitted", "Permitted" };
495
496  uint64_t Value = ParseInteger(Data, Offset);
497  StringRef ValueDesc =
498    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
499  PrintAttribute(Tag, Value, ValueDesc);
500}
501
502void ARMAttributeParser::DIV_use(AttrType Tag, const uint8_t *Data,
503                                 uint32_t &Offset) {
504  static const char *Strings[] = {
505    "If Available", "Not Permitted", "Permitted"
506  };
507
508  uint64_t Value = ParseInteger(Data, Offset);
509  StringRef ValueDesc =
510    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
511  PrintAttribute(Tag, Value, ValueDesc);
512}
513
514void ARMAttributeParser::T2EE_use(AttrType Tag, const uint8_t *Data,
515                                  uint32_t &Offset) {
516  static const char *Strings[] = { "Not Permitted", "Permitted" };
517
518  uint64_t Value = ParseInteger(Data, Offset);
519  StringRef ValueDesc =
520    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
521  PrintAttribute(Tag, Value, ValueDesc);
522}
523
524void ARMAttributeParser::Virtualization_use(AttrType Tag, const uint8_t *Data,
525                                            uint32_t &Offset) {
526  static const char *Strings[] = {
527    "Not Permitted", "TrustZone", "Virtualization Extensions",
528    "TrustZone + Virtualization Extensions"
529  };
530
531  uint64_t Value = ParseInteger(Data, Offset);
532  StringRef ValueDesc =
533    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
534  PrintAttribute(Tag, Value, ValueDesc);
535}
536
537void ARMAttributeParser::nodefaults(AttrType Tag, const uint8_t *Data,
538                                    uint32_t &Offset) {
539  uint64_t Value = ParseInteger(Data, Offset);
540  PrintAttribute(Tag, Value, "Unspecified Tags UNDEFINED");
541}
542
543void ARMAttributeParser::ParseIndexList(const uint8_t *Data, uint32_t &Offset,
544                                        SmallVectorImpl<uint8_t> &IndexList) {
545  for (;;) {
546    unsigned Length;
547    uint64_t Value = decodeULEB128(Data + Offset, &Length);
548    Offset = Offset + Length;
549    if (Value == 0)
550      break;
551    IndexList.push_back(Value);
552  }
553}
554
555void ARMAttributeParser::ParseAttributeList(const uint8_t *Data,
556                                            uint32_t &Offset, uint32_t Length) {
557  while (Offset < Length) {
558    unsigned Length;
559    uint64_t Tag = decodeULEB128(Data + Offset, &Length);
560    Offset += Length;
561
562    bool Handled = false;
563    for (unsigned AHI = 0, AHE = array_lengthof(DisplayRoutines);
564         AHI != AHE && !Handled; ++AHI) {
565      if (DisplayRoutines[AHI].Attribute == Tag) {
566        (this->*DisplayRoutines[AHI].Routine)(ARMBuildAttrs::AttrType(Tag),
567                                              Data, Offset);
568        Handled = true;
569        break;
570      }
571    }
572    if (!Handled) {
573      if (Tag < 32) {
574        errs() << "unhandled AEABI Tag " << Tag
575               << " (" << ARMBuildAttrs::AttrTypeAsString(Tag) << ")\n";
576        continue;
577      }
578
579      if (Tag % 2 == 0)
580        IntegerAttribute(ARMBuildAttrs::AttrType(Tag), Data, Offset);
581      else
582        StringAttribute(ARMBuildAttrs::AttrType(Tag), Data, Offset);
583    }
584  }
585}
586
587void ARMAttributeParser::ParseSubsection(const uint8_t *Data, uint32_t Length) {
588  uint32_t Offset = sizeof(uint32_t); /* SectionLength */
589
590  SW.printNumber("SectionLength", Length);
591
592  const char *VendorName = reinterpret_cast<const char*>(Data + Offset);
593  size_t VendorNameLength = std::strlen(VendorName);
594  SW.printString("Vendor", StringRef(VendorName, VendorNameLength));
595  Offset = Offset + VendorNameLength + 1;
596
597  if (StringRef(VendorName, VendorNameLength).lower() != "aeabi")
598    return;
599
600  while (Offset < Length) {
601    /// Tag_File | Tag_Section | Tag_Symbol   uleb128:byte-size
602    uint8_t Tag = Data[Offset];
603    SW.printEnum("Tag", Tag, makeArrayRef(TagNames));
604    Offset = Offset + sizeof(Tag);
605
606    uint32_t Size =
607      *reinterpret_cast<const support::ulittle32_t*>(Data + Offset);
608    SW.printNumber("Size", Size);
609    Offset = Offset + sizeof(Size);
610
611    if (Size > Length) {
612      errs() << "subsection length greater than section length\n";
613      return;
614    }
615
616    StringRef ScopeName, IndexName;
617    SmallVector<uint8_t, 8> Indicies;
618    switch (Tag) {
619    case ARMBuildAttrs::File:
620      ScopeName = "FileAttributes";
621      break;
622    case ARMBuildAttrs::Section:
623      ScopeName = "SectionAttributes";
624      IndexName = "Sections";
625      ParseIndexList(Data, Offset, Indicies);
626      break;
627    case ARMBuildAttrs::Symbol:
628      ScopeName = "SymbolAttributes";
629      IndexName = "Symbols";
630      ParseIndexList(Data, Offset, Indicies);
631      break;
632    default:
633      errs() << "unrecognised tag: 0x" << utohexstr(Tag) << '\n';
634      return;
635    }
636
637    DictScope ASS(SW, ScopeName);
638
639    if (!Indicies.empty())
640      SW.printList(IndexName, Indicies);
641
642    ParseAttributeList(Data, Offset, Length);
643  }
644}
645
646void ARMAttributeParser::Parse(ArrayRef<uint8_t> Section) {
647  size_t Offset = 1;
648  unsigned SectionNumber = 0;
649
650  while (Offset < Section.size()) {
651    uint32_t SectionLength =
652      *reinterpret_cast<const support::ulittle32_t*>(Section.data() + Offset);
653
654    SW.startLine() << "Section " << ++SectionNumber << " {\n";
655    SW.indent();
656
657    ParseSubsection(Section.data() + Offset, SectionLength);
658    Offset = Offset + SectionLength;
659
660    SW.unindent();
661    SW.startLine() << "}\n";
662  }
663}
664}
665
666