1 //===-- llvm/BinaryFormat/Dwarf.h ---Dwarf Constants-------------*- 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 /// \file
11 /// This file contains constants used for implementing Dwarf
12 /// debug support.
13 ///
14 /// For details on the Dwarf specfication see the latest DWARF Debugging
15 /// Information Format standard document on http://www.dwarfstd.org. This
16 /// file often includes support for non-released standard features.
17 //
18 //===----------------------------------------------------------------------===//
19
20 #ifndef LLVM_BINARYFORMAT_DWARF_H
21 #define LLVM_BINARYFORMAT_DWARF_H
22
23 #include "llvm/ADT/Optional.h"
24 #include "llvm/Support/Compiler.h"
25 #include "llvm/Support/DataTypes.h"
26 #include "llvm/Support/ErrorHandling.h"
27 #include "llvm/Support/Format.h"
28 #include "llvm/Support/FormatVariadicDetails.h"
29
30 namespace llvm {
31 class StringRef;
32
33 namespace dwarf {
34
35 //===----------------------------------------------------------------------===//
36 // DWARF constants as gleaned from the DWARF Debugging Information Format V.5
37 // reference manual http://www.dwarfstd.org/.
38 //
39
40 // Do not mix the following two enumerations sets. DW_TAG_invalid changes the
41 // enumeration base type.
42
43 enum LLVMConstants : uint32_t {
44 // LLVM mock tags (see also llvm/BinaryFormat/Dwarf.def).
45 DW_TAG_invalid = ~0U, // Tag for invalid results.
46 DW_VIRTUALITY_invalid = ~0U, // Virtuality for invalid results.
47 DW_MACINFO_invalid = ~0U, // Macinfo type for invalid results.
48
49 // Other constants.
50 DWARF_VERSION = 4, // Default dwarf version we output.
51 DW_PUBTYPES_VERSION = 2, // Section version number for .debug_pubtypes.
52 DW_PUBNAMES_VERSION = 2, // Section version number for .debug_pubnames.
53 DW_ARANGES_VERSION = 2, // Section version number for .debug_aranges.
54 // Identifiers we use to distinguish vendor extensions.
55 DWARF_VENDOR_DWARF = 0, // Defined in v2 or later of the DWARF standard.
56 DWARF_VENDOR_APPLE = 1,
57 DWARF_VENDOR_BORLAND = 2,
58 DWARF_VENDOR_GNU = 3,
59 DWARF_VENDOR_GOOGLE = 4,
60 DWARF_VENDOR_LLVM = 5,
61 DWARF_VENDOR_MIPS = 6
62 };
63
64 /// Constants that define the DWARF format as 32 or 64 bit.
65 enum DwarfFormat : uint8_t { DWARF32, DWARF64 };
66
67 /// Special ID values that distinguish a CIE from a FDE in DWARF CFI.
68 /// Not inside an enum because a 64-bit value is needed.
69 /// @{
70 const uint32_t DW_CIE_ID = UINT32_MAX;
71 const uint64_t DW64_CIE_ID = UINT64_MAX;
72 /// @}
73
74 /// Identifier of an invalid DIE offset in the .debug_info section.
75 const uint32_t DW_INVALID_OFFSET = UINT32_MAX;
76
77 enum Tag : uint16_t {
78 #define HANDLE_DW_TAG(ID, NAME, VERSION, VENDOR) DW_TAG_##NAME = ID,
79 #include "llvm/BinaryFormat/Dwarf.def"
80 DW_TAG_lo_user = 0x4080,
81 DW_TAG_hi_user = 0xffff,
82 DW_TAG_user_base = 0x1000 ///< Recommended base for user tags.
83 };
84
isType(Tag T)85 inline bool isType(Tag T) {
86 switch (T) {
87 case DW_TAG_array_type:
88 case DW_TAG_class_type:
89 case DW_TAG_interface_type:
90 case DW_TAG_enumeration_type:
91 case DW_TAG_pointer_type:
92 case DW_TAG_reference_type:
93 case DW_TAG_rvalue_reference_type:
94 case DW_TAG_string_type:
95 case DW_TAG_structure_type:
96 case DW_TAG_subroutine_type:
97 case DW_TAG_union_type:
98 case DW_TAG_ptr_to_member_type:
99 case DW_TAG_set_type:
100 case DW_TAG_subrange_type:
101 case DW_TAG_base_type:
102 case DW_TAG_const_type:
103 case DW_TAG_file_type:
104 case DW_TAG_packed_type:
105 case DW_TAG_volatile_type:
106 case DW_TAG_typedef:
107 return true;
108 default:
109 return false;
110 }
111 }
112
113 /// Attributes.
114 enum Attribute : uint16_t {
115 #define HANDLE_DW_AT(ID, NAME, VERSION, VENDOR) DW_AT_##NAME = ID,
116 #include "llvm/BinaryFormat/Dwarf.def"
117 DW_AT_lo_user = 0x2000,
118 DW_AT_hi_user = 0x3fff,
119 };
120
121 enum Form : uint16_t {
122 #define HANDLE_DW_FORM(ID, NAME, VERSION, VENDOR) DW_FORM_##NAME = ID,
123 #include "llvm/BinaryFormat/Dwarf.def"
124 DW_FORM_lo_user = 0x1f00, ///< Not specified by DWARF.
125 };
126
127 enum LocationAtom {
128 #define HANDLE_DW_OP(ID, NAME, VERSION, VENDOR) DW_OP_##NAME = ID,
129 #include "llvm/BinaryFormat/Dwarf.def"
130 DW_OP_lo_user = 0xe0,
131 DW_OP_hi_user = 0xff,
132 DW_OP_LLVM_fragment = 0x1000 ///< Only used in LLVM metadata.
133 };
134
135 enum TypeKind : uint8_t {
136 #define HANDLE_DW_ATE(ID, NAME, VERSION, VENDOR) DW_ATE_##NAME = ID,
137 #include "llvm/BinaryFormat/Dwarf.def"
138 DW_ATE_lo_user = 0x80,
139 DW_ATE_hi_user = 0xff
140 };
141
142 enum DecimalSignEncoding {
143 // Decimal sign attribute values
144 DW_DS_unsigned = 0x01,
145 DW_DS_leading_overpunch = 0x02,
146 DW_DS_trailing_overpunch = 0x03,
147 DW_DS_leading_separate = 0x04,
148 DW_DS_trailing_separate = 0x05
149 };
150
151 enum EndianityEncoding {
152 // Endianity attribute values
153 DW_END_default = 0x00,
154 DW_END_big = 0x01,
155 DW_END_little = 0x02,
156 DW_END_lo_user = 0x40,
157 DW_END_hi_user = 0xff
158 };
159
160 enum AccessAttribute {
161 // Accessibility codes
162 DW_ACCESS_public = 0x01,
163 DW_ACCESS_protected = 0x02,
164 DW_ACCESS_private = 0x03
165 };
166
167 enum VisibilityAttribute {
168 // Visibility codes
169 DW_VIS_local = 0x01,
170 DW_VIS_exported = 0x02,
171 DW_VIS_qualified = 0x03
172 };
173
174 enum VirtualityAttribute {
175 #define HANDLE_DW_VIRTUALITY(ID, NAME) DW_VIRTUALITY_##NAME = ID,
176 #include "llvm/BinaryFormat/Dwarf.def"
177 DW_VIRTUALITY_max = 0x02
178 };
179
180 enum DefaultedMemberAttribute {
181 #define HANDLE_DW_DEFAULTED(ID, NAME) DW_DEFAULTED_##NAME = ID,
182 #include "llvm/BinaryFormat/Dwarf.def"
183 DW_DEFAULTED_max = 0x02
184 };
185
186 enum SourceLanguage {
187 #define HANDLE_DW_LANG(ID, NAME, VERSION, VENDOR) DW_LANG_##NAME = ID,
188 #include "llvm/BinaryFormat/Dwarf.def"
189 DW_LANG_lo_user = 0x8000,
190 DW_LANG_hi_user = 0xffff
191 };
192
193 enum CaseSensitivity {
194 // Identifier case codes
195 DW_ID_case_sensitive = 0x00,
196 DW_ID_up_case = 0x01,
197 DW_ID_down_case = 0x02,
198 DW_ID_case_insensitive = 0x03
199 };
200
201 enum CallingConvention {
202 // Calling convention codes
203 #define HANDLE_DW_CC(ID, NAME) DW_CC_##NAME = ID,
204 #include "llvm/BinaryFormat/Dwarf.def"
205 DW_CC_lo_user = 0x40,
206 DW_CC_hi_user = 0xff
207 };
208
209 enum InlineAttribute {
210 // Inline codes
211 DW_INL_not_inlined = 0x00,
212 DW_INL_inlined = 0x01,
213 DW_INL_declared_not_inlined = 0x02,
214 DW_INL_declared_inlined = 0x03
215 };
216
217 enum ArrayDimensionOrdering {
218 // Array ordering
219 DW_ORD_row_major = 0x00,
220 DW_ORD_col_major = 0x01
221 };
222
223 enum DiscriminantList {
224 // Discriminant descriptor values
225 DW_DSC_label = 0x00,
226 DW_DSC_range = 0x01
227 };
228
229 /// Line Number Standard Opcode Encodings.
230 enum LineNumberOps : uint8_t {
231 #define HANDLE_DW_LNS(ID, NAME) DW_LNS_##NAME = ID,
232 #include "llvm/BinaryFormat/Dwarf.def"
233 };
234
235 /// Line Number Extended Opcode Encodings.
236 enum LineNumberExtendedOps {
237 #define HANDLE_DW_LNE(ID, NAME) DW_LNE_##NAME = ID,
238 #include "llvm/BinaryFormat/Dwarf.def"
239 DW_LNE_lo_user = 0x80,
240 DW_LNE_hi_user = 0xff
241 };
242
243 enum LineNumberEntryFormat {
244 #define HANDLE_DW_LNCT(ID, NAME) DW_LNCT_##NAME = ID,
245 #include "llvm/BinaryFormat/Dwarf.def"
246 DW_LNCT_lo_user = 0x2000,
247 DW_LNCT_hi_user = 0x3fff,
248 };
249
250 enum MacinfoRecordType {
251 // Macinfo Type Encodings
252 DW_MACINFO_define = 0x01,
253 DW_MACINFO_undef = 0x02,
254 DW_MACINFO_start_file = 0x03,
255 DW_MACINFO_end_file = 0x04,
256 DW_MACINFO_vendor_ext = 0xff
257 };
258
259 /// DWARF v5 macro information entry type encodings.
260 enum MacroEntryType {
261 #define HANDLE_DW_MACRO(ID, NAME) DW_MACRO_##NAME = ID,
262 #include "llvm/BinaryFormat/Dwarf.def"
263 DW_MACRO_lo_user = 0xe0,
264 DW_MACRO_hi_user = 0xff
265 };
266
267 /// DWARF v5 range list entry encoding values.
268 enum RangeListEntries {
269 #define HANDLE_DW_RLE(ID, NAME) DW_RLE_##NAME = ID,
270 #include "llvm/BinaryFormat/Dwarf.def"
271 };
272
273 /// Call frame instruction encodings.
274 enum CallFrameInfo {
275 #define HANDLE_DW_CFA(ID, NAME) DW_CFA_##NAME = ID,
276 #include "llvm/BinaryFormat/Dwarf.def"
277 DW_CFA_extended = 0x00,
278
279 DW_CFA_lo_user = 0x1c,
280 DW_CFA_hi_user = 0x3f
281 };
282
283 enum Constants {
284 // Children flag
285 DW_CHILDREN_no = 0x00,
286 DW_CHILDREN_yes = 0x01,
287
288 DW_EH_PE_absptr = 0x00,
289 DW_EH_PE_omit = 0xff,
290 DW_EH_PE_uleb128 = 0x01,
291 DW_EH_PE_udata2 = 0x02,
292 DW_EH_PE_udata4 = 0x03,
293 DW_EH_PE_udata8 = 0x04,
294 DW_EH_PE_sleb128 = 0x09,
295 DW_EH_PE_sdata2 = 0x0A,
296 DW_EH_PE_sdata4 = 0x0B,
297 DW_EH_PE_sdata8 = 0x0C,
298 DW_EH_PE_signed = 0x08,
299 DW_EH_PE_pcrel = 0x10,
300 DW_EH_PE_textrel = 0x20,
301 DW_EH_PE_datarel = 0x30,
302 DW_EH_PE_funcrel = 0x40,
303 DW_EH_PE_aligned = 0x50,
304 DW_EH_PE_indirect = 0x80
305 };
306
307 /// Constants for location lists in DWARF v5.
308 enum LocationListEntry : unsigned char {
309 DW_LLE_end_of_list = 0x00,
310 DW_LLE_base_addressx = 0x01,
311 DW_LLE_startx_endx = 0x02,
312 DW_LLE_startx_length = 0x03,
313 DW_LLE_offset_pair = 0x04,
314 DW_LLE_default_location = 0x05,
315 DW_LLE_base_address = 0x06,
316 DW_LLE_start_end = 0x07,
317 DW_LLE_start_length = 0x08
318 };
319
320 /// Constants for the DW_APPLE_PROPERTY_attributes attribute.
321 /// Keep this list in sync with clang's DeclSpec.h ObjCPropertyAttributeKind!
322 enum ApplePropertyAttributes {
323 #define HANDLE_DW_APPLE_PROPERTY(ID, NAME) DW_APPLE_PROPERTY_##NAME = ID,
324 #include "llvm/BinaryFormat/Dwarf.def"
325 };
326
327 /// Constants for unit types in DWARF v5.
328 enum UnitType : unsigned char {
329 #define HANDLE_DW_UT(ID, NAME) DW_UT_##NAME = ID,
330 #include "llvm/BinaryFormat/Dwarf.def"
331 DW_UT_lo_user = 0x80,
332 DW_UT_hi_user = 0xff
333 };
334
335 enum Index {
336 #define HANDLE_DW_IDX(ID, NAME) DW_IDX_##NAME = ID,
337 #include "llvm/BinaryFormat/Dwarf.def"
338 DW_IDX_lo_user = 0x2000,
339 DW_IDX_hi_user = 0x3fff
340 };
341
isUnitType(uint8_t UnitType)342 inline bool isUnitType(uint8_t UnitType) {
343 switch (UnitType) {
344 case DW_UT_compile:
345 case DW_UT_type:
346 case DW_UT_partial:
347 case DW_UT_skeleton:
348 case DW_UT_split_compile:
349 case DW_UT_split_type:
350 return true;
351 default:
352 return false;
353 }
354 }
355
isUnitType(dwarf::Tag T)356 inline bool isUnitType(dwarf::Tag T) {
357 switch (T) {
358 case DW_TAG_compile_unit:
359 case DW_TAG_type_unit:
360 case DW_TAG_partial_unit:
361 case DW_TAG_skeleton_unit:
362 return true;
363 default:
364 return false;
365 }
366 }
367
368 // Constants for the DWARF v5 Accelerator Table Proposal
369 enum AcceleratorTable {
370 // Data layout descriptors.
371 DW_ATOM_null = 0u, /// Marker as the end of a list of atoms.
372 DW_ATOM_die_offset = 1u, // DIE offset in the debug_info section.
373 DW_ATOM_cu_offset = 2u, // Offset of the compile unit header that contains the
374 // item in question.
375 DW_ATOM_die_tag = 3u, // A tag entry.
376 DW_ATOM_type_flags = 4u, // Set of flags for a type.
377
378 DW_ATOM_type_type_flags = 5u, // Dsymutil type extension.
379 DW_ATOM_qual_name_hash = 6u, // Dsymutil qualified hash extension.
380
381 // DW_ATOM_type_flags values.
382
383 // Always set for C++, only set for ObjC if this is the @implementation for a
384 // class.
385 DW_FLAG_type_implementation = 2u,
386
387 // Hash functions.
388
389 // Daniel J. Bernstein hash.
390 DW_hash_function_djb = 0u
391 };
392
393 // Constants for the GNU pubnames/pubtypes extensions supporting gdb index.
394 enum GDBIndexEntryKind {
395 GIEK_NONE,
396 GIEK_TYPE,
397 GIEK_VARIABLE,
398 GIEK_FUNCTION,
399 GIEK_OTHER,
400 GIEK_UNUSED5,
401 GIEK_UNUSED6,
402 GIEK_UNUSED7
403 };
404
405 enum GDBIndexEntryLinkage { GIEL_EXTERNAL, GIEL_STATIC };
406
407 /// \defgroup DwarfConstantsDumping Dwarf constants dumping functions
408 ///
409 /// All these functions map their argument's value back to the
410 /// corresponding enumerator name or return an empty StringRef if the value
411 /// isn't known.
412 ///
413 /// @{
414 StringRef TagString(unsigned Tag);
415 StringRef ChildrenString(unsigned Children);
416 StringRef AttributeString(unsigned Attribute);
417 StringRef FormEncodingString(unsigned Encoding);
418 StringRef OperationEncodingString(unsigned Encoding);
419 StringRef AttributeEncodingString(unsigned Encoding);
420 StringRef DecimalSignString(unsigned Sign);
421 StringRef EndianityString(unsigned Endian);
422 StringRef AccessibilityString(unsigned Access);
423 StringRef VisibilityString(unsigned Visibility);
424 StringRef VirtualityString(unsigned Virtuality);
425 StringRef LanguageString(unsigned Language);
426 StringRef CaseString(unsigned Case);
427 StringRef ConventionString(unsigned Convention);
428 StringRef InlineCodeString(unsigned Code);
429 StringRef ArrayOrderString(unsigned Order);
430 StringRef LNStandardString(unsigned Standard);
431 StringRef LNExtendedString(unsigned Encoding);
432 StringRef MacinfoString(unsigned Encoding);
433 StringRef RangeListEncodingString(unsigned Encoding);
434 StringRef CallFrameString(unsigned Encoding);
435 StringRef ApplePropertyString(unsigned);
436 StringRef UnitTypeString(unsigned);
437 StringRef AtomTypeString(unsigned Atom);
438 StringRef GDBIndexEntryKindString(GDBIndexEntryKind Kind);
439 StringRef GDBIndexEntryLinkageString(GDBIndexEntryLinkage Linkage);
440 StringRef IndexString(unsigned Idx);
441 /// @}
442
443 /// \defgroup DwarfConstantsParsing Dwarf constants parsing functions
444 ///
445 /// These functions map their strings back to the corresponding enumeration
446 /// value or return 0 if there is none, except for these exceptions:
447 ///
448 /// \li \a getTag() returns \a DW_TAG_invalid on invalid input.
449 /// \li \a getVirtuality() returns \a DW_VIRTUALITY_invalid on invalid input.
450 /// \li \a getMacinfo() returns \a DW_MACINFO_invalid on invalid input.
451 ///
452 /// @{
453 unsigned getTag(StringRef TagString);
454 unsigned getOperationEncoding(StringRef OperationEncodingString);
455 unsigned getVirtuality(StringRef VirtualityString);
456 unsigned getLanguage(StringRef LanguageString);
457 unsigned getCallingConvention(StringRef LanguageString);
458 unsigned getAttributeEncoding(StringRef EncodingString);
459 unsigned getMacinfo(StringRef MacinfoString);
460 /// @}
461
462 /// \defgroup DwarfConstantsVersioning Dwarf version for constants
463 ///
464 /// For constants defined by DWARF, returns the DWARF version when the constant
465 /// was first defined. For vendor extensions, if there is a version-related
466 /// policy for when to emit it, returns a version number for that policy.
467 /// Otherwise returns 0.
468 ///
469 /// @{
470 unsigned TagVersion(Tag T);
471 unsigned AttributeVersion(Attribute A);
472 unsigned FormVersion(Form F);
473 unsigned OperationVersion(LocationAtom O);
474 unsigned AttributeEncodingVersion(TypeKind E);
475 unsigned LanguageVersion(SourceLanguage L);
476 /// @}
477
478 /// \defgroup DwarfConstantsVendor Dwarf "vendor" for constants
479 ///
480 /// These functions return an identifier describing "who" defined the constant,
481 /// either the DWARF standard itself or the vendor who defined the extension.
482 ///
483 /// @{
484 unsigned TagVendor(Tag T);
485 unsigned AttributeVendor(Attribute A);
486 unsigned FormVendor(Form F);
487 unsigned OperationVendor(LocationAtom O);
488 unsigned AttributeEncodingVendor(TypeKind E);
489 unsigned LanguageVendor(SourceLanguage L);
490 /// @}
491
492 /// A helper struct providing information about the byte size of DW_FORM
493 /// values that vary in size depending on the DWARF version, address byte
494 /// size, or DWARF32/DWARF64.
495 struct FormParams {
496 uint16_t Version;
497 uint8_t AddrSize;
498 DwarfFormat Format;
499
500 /// The definition of the size of form DW_FORM_ref_addr depends on the
501 /// version. In DWARF v2 it's the size of an address; after that, it's the
502 /// size of a reference.
getRefAddrByteSizeFormParams503 uint8_t getRefAddrByteSize() const {
504 if (Version == 2)
505 return AddrSize;
506 return getDwarfOffsetByteSize();
507 }
508
509 /// The size of a reference is determined by the DWARF 32/64-bit format.
getDwarfOffsetByteSizeFormParams510 uint8_t getDwarfOffsetByteSize() const {
511 switch (Format) {
512 case DwarfFormat::DWARF32:
513 return 4;
514 case DwarfFormat::DWARF64:
515 return 8;
516 }
517 llvm_unreachable("Invalid Format value");
518 }
519
520 explicit operator bool() const { return Version && AddrSize; }
521 };
522
523 /// Get the fixed byte size for a given form.
524 ///
525 /// If the form has a fixed byte size, then an Optional with a value will be
526 /// returned. If the form is always encoded using a variable length storage
527 /// format (ULEB or SLEB numbers or blocks) then None will be returned.
528 ///
529 /// \param Form DWARF form to get the fixed byte size for.
530 /// \param Params DWARF parameters to help interpret forms.
531 /// \returns Optional<uint8_t> value with the fixed byte size or None if
532 /// \p Form doesn't have a fixed byte size.
533 Optional<uint8_t> getFixedFormByteSize(dwarf::Form Form, FormParams Params);
534
535 /// Tells whether the specified form is defined in the specified version,
536 /// or is an extension if extensions are allowed.
537 bool isValidFormForVersion(Form F, unsigned Version, bool ExtensionsOk = true);
538
539 /// Returns the symbolic string representing Val when used as a value
540 /// for attribute Attr.
541 StringRef AttributeValueString(uint16_t Attr, unsigned Val);
542
543 /// Returns the symbolic string representing Val when used as a value
544 /// for atom Atom.
545 StringRef AtomValueString(uint16_t Atom, unsigned Val);
546
547 /// Describes an entry of the various gnu_pub* debug sections.
548 ///
549 /// The gnu_pub* kind looks like:
550 ///
551 /// 0-3 reserved
552 /// 4-6 symbol kind
553 /// 7 0 == global, 1 == static
554 ///
555 /// A gdb_index descriptor includes the above kind, shifted 24 bits up with the
556 /// offset of the cu within the debug_info section stored in those 24 bits.
557 struct PubIndexEntryDescriptor {
558 GDBIndexEntryKind Kind;
559 GDBIndexEntryLinkage Linkage;
PubIndexEntryDescriptorPubIndexEntryDescriptor560 PubIndexEntryDescriptor(GDBIndexEntryKind Kind, GDBIndexEntryLinkage Linkage)
561 : Kind(Kind), Linkage(Linkage) {}
PubIndexEntryDescriptorPubIndexEntryDescriptor562 /* implicit */ PubIndexEntryDescriptor(GDBIndexEntryKind Kind)
563 : Kind(Kind), Linkage(GIEL_EXTERNAL) {}
PubIndexEntryDescriptorPubIndexEntryDescriptor564 explicit PubIndexEntryDescriptor(uint8_t Value)
565 : Kind(
566 static_cast<GDBIndexEntryKind>((Value & KIND_MASK) >> KIND_OFFSET)),
567 Linkage(static_cast<GDBIndexEntryLinkage>((Value & LINKAGE_MASK) >>
568 LINKAGE_OFFSET)) {}
toBitsPubIndexEntryDescriptor569 uint8_t toBits() const {
570 return Kind << KIND_OFFSET | Linkage << LINKAGE_OFFSET;
571 }
572
573 private:
574 enum {
575 KIND_OFFSET = 4,
576 KIND_MASK = 7 << KIND_OFFSET,
577 LINKAGE_OFFSET = 7,
578 LINKAGE_MASK = 1 << LINKAGE_OFFSET
579 };
580 };
581
582 template <typename Enum> struct EnumTraits : public std::false_type {};
583
584 template <> struct EnumTraits<Attribute> : public std::true_type {
585 static constexpr char Type[3] = "AT";
586 static constexpr StringRef (*StringFn)(unsigned) = &AttributeString;
587 };
588
589 template <> struct EnumTraits<Form> : public std::true_type {
590 static constexpr char Type[5] = "FORM";
591 static constexpr StringRef (*StringFn)(unsigned) = &FormEncodingString;
592 };
593
594 template <> struct EnumTraits<Index> : public std::true_type {
595 static constexpr char Type[4] = "IDX";
596 static constexpr StringRef (*StringFn)(unsigned) = &IndexString;
597 };
598
599 template <> struct EnumTraits<Tag> : public std::true_type {
600 static constexpr char Type[4] = "TAG";
601 static constexpr StringRef (*StringFn)(unsigned) = &TagString;
602 };
603 } // End of namespace dwarf
604
605 /// Dwarf constants format_provider
606 ///
607 /// Specialization of the format_provider template for dwarf enums. Unlike the
608 /// dumping functions above, these format unknown enumerator values as
609 /// DW_TYPE_unknown_1234 (e.g. DW_TAG_unknown_ffff).
610 template <typename Enum>
611 struct format_provider<
612 Enum, typename std::enable_if<dwarf::EnumTraits<Enum>::value>::type> {
613 static void format(const Enum &E, raw_ostream &OS, StringRef Style) {
614 StringRef Str = dwarf::EnumTraits<Enum>::StringFn(E);
615 if (Str.empty()) {
616 OS << "DW_" << dwarf::EnumTraits<Enum>::Type << "_unknown_"
617 << llvm::format("%x", E);
618 } else
619 OS << Str;
620 }
621 };
622 } // End of namespace llvm
623
624 #endif
625