1 //===-- llvm/BinaryFormat/Dwarf.h ---Dwarf Constants-------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
10 /// This file contains constants used for implementing Dwarf
13 /// For details on the Dwarf specfication see the latest DWARF Debugging
14 /// Information Format standard document on http://www.dwarfstd.org. This
15 /// file often includes support for non-released standard features.
17 //===----------------------------------------------------------------------===//
19 #ifndef LLVM_BINARYFORMAT_DWARF_H
20 #define LLVM_BINARYFORMAT_DWARF_H
22 #include "llvm/ADT/Optional.h"
23 #include "llvm/Support/Compiler.h"
24 #include "llvm/Support/DataTypes.h"
25 #include "llvm/Support/ErrorHandling.h"
26 #include "llvm/Support/Format.h"
27 #include "llvm/Support/FormatVariadicDetails.h"
28 #include "llvm/ADT/Triple.h"
35 //===----------------------------------------------------------------------===//
36 // DWARF constants as gleaned from the DWARF Debugging Information Format V.5
37 // reference manual http://www.dwarfstd.org/.
40 // Do not mix the following two enumerations sets. DW_TAG_invalid changes the
41 // enumeration base type.
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.
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,
59 DWARF_VENDOR_GOOGLE = 4,
60 DWARF_VENDOR_LLVM = 5,
64 /// Constants that define the DWARF format as 32 or 64 bit.
65 enum DwarfFormat : uint8_t { DWARF32, DWARF64 };
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.
70 const uint32_t DW_CIE_ID = UINT32_MAX;
71 const uint64_t DW64_CIE_ID = UINT64_MAX;
74 /// Identifier of an invalid DIE offset in the .debug_info section.
75 const uint32_t DW_INVALID_OFFSET = UINT32_MAX;
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.
85 inline bool isType(Tag 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:
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:
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,
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.
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 DW_OP_LLVM_convert = 0x1001, ///< Only used in LLVM metadata.
134 DW_OP_LLVM_tag_offset = 0x1002, ///< Only used in LLVM metadata.
137 enum TypeKind : uint8_t {
138 #define HANDLE_DW_ATE(ID, NAME, VERSION, VENDOR) DW_ATE_##NAME = ID,
139 #include "llvm/BinaryFormat/Dwarf.def"
140 DW_ATE_lo_user = 0x80,
141 DW_ATE_hi_user = 0xff
144 enum DecimalSignEncoding {
145 // Decimal sign attribute values
146 DW_DS_unsigned = 0x01,
147 DW_DS_leading_overpunch = 0x02,
148 DW_DS_trailing_overpunch = 0x03,
149 DW_DS_leading_separate = 0x04,
150 DW_DS_trailing_separate = 0x05
153 enum EndianityEncoding {
154 // Endianity attribute values
155 #define HANDLE_DW_END(ID, NAME) DW_END_##NAME = ID,
156 #include "llvm/BinaryFormat/Dwarf.def"
157 DW_END_lo_user = 0x40,
158 DW_END_hi_user = 0xff
161 enum AccessAttribute {
162 // Accessibility codes
163 DW_ACCESS_public = 0x01,
164 DW_ACCESS_protected = 0x02,
165 DW_ACCESS_private = 0x03
168 enum VisibilityAttribute {
171 DW_VIS_exported = 0x02,
172 DW_VIS_qualified = 0x03
175 enum VirtualityAttribute {
176 #define HANDLE_DW_VIRTUALITY(ID, NAME) DW_VIRTUALITY_##NAME = ID,
177 #include "llvm/BinaryFormat/Dwarf.def"
178 DW_VIRTUALITY_max = 0x02
181 enum DefaultedMemberAttribute {
182 #define HANDLE_DW_DEFAULTED(ID, NAME) DW_DEFAULTED_##NAME = ID,
183 #include "llvm/BinaryFormat/Dwarf.def"
184 DW_DEFAULTED_max = 0x02
187 enum SourceLanguage {
188 #define HANDLE_DW_LANG(ID, NAME, LOWER_BOUND, VERSION, VENDOR) \
190 #include "llvm/BinaryFormat/Dwarf.def"
191 DW_LANG_lo_user = 0x8000,
192 DW_LANG_hi_user = 0xffff
195 enum CaseSensitivity {
196 // Identifier case codes
197 DW_ID_case_sensitive = 0x00,
198 DW_ID_up_case = 0x01,
199 DW_ID_down_case = 0x02,
200 DW_ID_case_insensitive = 0x03
203 enum CallingConvention {
204 // Calling convention codes
205 #define HANDLE_DW_CC(ID, NAME) DW_CC_##NAME = ID,
206 #include "llvm/BinaryFormat/Dwarf.def"
207 DW_CC_lo_user = 0x40,
211 enum InlineAttribute {
213 DW_INL_not_inlined = 0x00,
214 DW_INL_inlined = 0x01,
215 DW_INL_declared_not_inlined = 0x02,
216 DW_INL_declared_inlined = 0x03
219 enum ArrayDimensionOrdering {
221 DW_ORD_row_major = 0x00,
222 DW_ORD_col_major = 0x01
225 enum DiscriminantList {
226 // Discriminant descriptor values
231 /// Line Number Standard Opcode Encodings.
232 enum LineNumberOps : uint8_t {
233 #define HANDLE_DW_LNS(ID, NAME) DW_LNS_##NAME = ID,
234 #include "llvm/BinaryFormat/Dwarf.def"
237 /// Line Number Extended Opcode Encodings.
238 enum LineNumberExtendedOps {
239 #define HANDLE_DW_LNE(ID, NAME) DW_LNE_##NAME = ID,
240 #include "llvm/BinaryFormat/Dwarf.def"
241 DW_LNE_lo_user = 0x80,
242 DW_LNE_hi_user = 0xff
245 enum LineNumberEntryFormat {
246 #define HANDLE_DW_LNCT(ID, NAME) DW_LNCT_##NAME = ID,
247 #include "llvm/BinaryFormat/Dwarf.def"
248 DW_LNCT_lo_user = 0x2000,
249 DW_LNCT_hi_user = 0x3fff,
252 enum MacinfoRecordType {
253 // Macinfo Type Encodings
254 DW_MACINFO_define = 0x01,
255 DW_MACINFO_undef = 0x02,
256 DW_MACINFO_start_file = 0x03,
257 DW_MACINFO_end_file = 0x04,
258 DW_MACINFO_vendor_ext = 0xff
261 /// DWARF v5 macro information entry type encodings.
262 enum MacroEntryType {
263 #define HANDLE_DW_MACRO(ID, NAME) DW_MACRO_##NAME = ID,
264 #include "llvm/BinaryFormat/Dwarf.def"
265 DW_MACRO_lo_user = 0xe0,
266 DW_MACRO_hi_user = 0xff
269 /// DWARF v5 range list entry encoding values.
270 enum RangeListEntries {
271 #define HANDLE_DW_RLE(ID, NAME) DW_RLE_##NAME = ID,
272 #include "llvm/BinaryFormat/Dwarf.def"
275 /// Call frame instruction encodings.
277 #define HANDLE_DW_CFA(ID, NAME) DW_CFA_##NAME = ID,
278 #define HANDLE_DW_CFA_PRED(ID, NAME, ARCH) DW_CFA_##NAME = ID,
279 #include "llvm/BinaryFormat/Dwarf.def"
280 DW_CFA_extended = 0x00,
282 DW_CFA_lo_user = 0x1c,
283 DW_CFA_hi_user = 0x3f
288 DW_CHILDREN_no = 0x00,
289 DW_CHILDREN_yes = 0x01,
291 DW_EH_PE_absptr = 0x00,
292 DW_EH_PE_omit = 0xff,
293 DW_EH_PE_uleb128 = 0x01,
294 DW_EH_PE_udata2 = 0x02,
295 DW_EH_PE_udata4 = 0x03,
296 DW_EH_PE_udata8 = 0x04,
297 DW_EH_PE_sleb128 = 0x09,
298 DW_EH_PE_sdata2 = 0x0A,
299 DW_EH_PE_sdata4 = 0x0B,
300 DW_EH_PE_sdata8 = 0x0C,
301 DW_EH_PE_signed = 0x08,
302 DW_EH_PE_pcrel = 0x10,
303 DW_EH_PE_textrel = 0x20,
304 DW_EH_PE_datarel = 0x30,
305 DW_EH_PE_funcrel = 0x40,
306 DW_EH_PE_aligned = 0x50,
307 DW_EH_PE_indirect = 0x80
310 /// Constants for location lists in DWARF v5.
311 enum LocationListEntry : unsigned char {
312 DW_LLE_end_of_list = 0x00,
313 DW_LLE_base_addressx = 0x01,
314 DW_LLE_startx_endx = 0x02,
315 DW_LLE_startx_length = 0x03,
316 DW_LLE_offset_pair = 0x04,
317 DW_LLE_default_location = 0x05,
318 DW_LLE_base_address = 0x06,
319 DW_LLE_start_end = 0x07,
320 DW_LLE_start_length = 0x08
323 /// Constants for the DW_APPLE_PROPERTY_attributes attribute.
324 /// Keep this list in sync with clang's DeclSpec.h ObjCPropertyAttributeKind!
325 enum ApplePropertyAttributes {
326 #define HANDLE_DW_APPLE_PROPERTY(ID, NAME) DW_APPLE_PROPERTY_##NAME = ID,
327 #include "llvm/BinaryFormat/Dwarf.def"
330 /// Constants for unit types in DWARF v5.
331 enum UnitType : unsigned char {
332 #define HANDLE_DW_UT(ID, NAME) DW_UT_##NAME = ID,
333 #include "llvm/BinaryFormat/Dwarf.def"
334 DW_UT_lo_user = 0x80,
339 #define HANDLE_DW_IDX(ID, NAME) DW_IDX_##NAME = ID,
340 #include "llvm/BinaryFormat/Dwarf.def"
341 DW_IDX_lo_user = 0x2000,
342 DW_IDX_hi_user = 0x3fff
345 inline bool isUnitType(uint8_t UnitType) {
351 case DW_UT_split_compile:
352 case DW_UT_split_type:
359 inline bool isUnitType(dwarf::Tag T) {
361 case DW_TAG_compile_unit:
362 case DW_TAG_type_unit:
363 case DW_TAG_partial_unit:
364 case DW_TAG_skeleton_unit:
371 // Constants for the DWARF v5 Accelerator Table Proposal
372 enum AcceleratorTable {
373 // Data layout descriptors.
374 DW_ATOM_null = 0u, /// Marker as the end of a list of atoms.
375 DW_ATOM_die_offset = 1u, // DIE offset in the debug_info section.
376 DW_ATOM_cu_offset = 2u, // Offset of the compile unit header that contains the
378 DW_ATOM_die_tag = 3u, // A tag entry.
379 DW_ATOM_type_flags = 4u, // Set of flags for a type.
381 DW_ATOM_type_type_flags = 5u, // Dsymutil type extension.
382 DW_ATOM_qual_name_hash = 6u, // Dsymutil qualified hash extension.
384 // DW_ATOM_type_flags values.
386 // Always set for C++, only set for ObjC if this is the @implementation for a
388 DW_FLAG_type_implementation = 2u,
392 // Daniel J. Bernstein hash.
393 DW_hash_function_djb = 0u
396 // Constants for the GNU pubnames/pubtypes extensions supporting gdb index.
397 enum GDBIndexEntryKind {
408 enum GDBIndexEntryLinkage { GIEL_EXTERNAL, GIEL_STATIC };
410 /// \defgroup DwarfConstantsDumping Dwarf constants dumping functions
412 /// All these functions map their argument's value back to the
413 /// corresponding enumerator name or return an empty StringRef if the value
417 StringRef TagString(unsigned Tag);
418 StringRef ChildrenString(unsigned Children);
419 StringRef AttributeString(unsigned Attribute);
420 StringRef FormEncodingString(unsigned Encoding);
421 StringRef OperationEncodingString(unsigned Encoding);
422 StringRef AttributeEncodingString(unsigned Encoding);
423 StringRef DecimalSignString(unsigned Sign);
424 StringRef EndianityString(unsigned Endian);
425 StringRef AccessibilityString(unsigned Access);
426 StringRef VisibilityString(unsigned Visibility);
427 StringRef VirtualityString(unsigned Virtuality);
428 StringRef LanguageString(unsigned Language);
429 StringRef CaseString(unsigned Case);
430 StringRef ConventionString(unsigned Convention);
431 StringRef InlineCodeString(unsigned Code);
432 StringRef ArrayOrderString(unsigned Order);
433 StringRef LNStandardString(unsigned Standard);
434 StringRef LNExtendedString(unsigned Encoding);
435 StringRef MacinfoString(unsigned Encoding);
436 StringRef RangeListEncodingString(unsigned Encoding);
437 StringRef CallFrameString(unsigned Encoding, Triple::ArchType Arch);
438 StringRef ApplePropertyString(unsigned);
439 StringRef UnitTypeString(unsigned);
440 StringRef AtomTypeString(unsigned Atom);
441 StringRef GDBIndexEntryKindString(GDBIndexEntryKind Kind);
442 StringRef GDBIndexEntryLinkageString(GDBIndexEntryLinkage Linkage);
443 StringRef IndexString(unsigned Idx);
446 /// \defgroup DwarfConstantsParsing Dwarf constants parsing functions
448 /// These functions map their strings back to the corresponding enumeration
449 /// value or return 0 if there is none, except for these exceptions:
451 /// \li \a getTag() returns \a DW_TAG_invalid on invalid input.
452 /// \li \a getVirtuality() returns \a DW_VIRTUALITY_invalid on invalid input.
453 /// \li \a getMacinfo() returns \a DW_MACINFO_invalid on invalid input.
456 unsigned getTag(StringRef TagString);
457 unsigned getOperationEncoding(StringRef OperationEncodingString);
458 unsigned getVirtuality(StringRef VirtualityString);
459 unsigned getLanguage(StringRef LanguageString);
460 unsigned getCallingConvention(StringRef LanguageString);
461 unsigned getAttributeEncoding(StringRef EncodingString);
462 unsigned getMacinfo(StringRef MacinfoString);
465 /// \defgroup DwarfConstantsVersioning Dwarf version for constants
467 /// For constants defined by DWARF, returns the DWARF version when the constant
468 /// was first defined. For vendor extensions, if there is a version-related
469 /// policy for when to emit it, returns a version number for that policy.
470 /// Otherwise returns 0.
473 unsigned TagVersion(Tag T);
474 unsigned AttributeVersion(Attribute A);
475 unsigned FormVersion(Form F);
476 unsigned OperationVersion(LocationAtom O);
477 unsigned AttributeEncodingVersion(TypeKind E);
478 unsigned LanguageVersion(SourceLanguage L);
481 /// \defgroup DwarfConstantsVendor Dwarf "vendor" for constants
483 /// These functions return an identifier describing "who" defined the constant,
484 /// either the DWARF standard itself or the vendor who defined the extension.
487 unsigned TagVendor(Tag T);
488 unsigned AttributeVendor(Attribute A);
489 unsigned FormVendor(Form F);
490 unsigned OperationVendor(LocationAtom O);
491 unsigned AttributeEncodingVendor(TypeKind E);
492 unsigned LanguageVendor(SourceLanguage L);
495 Optional<unsigned> LanguageLowerBound(SourceLanguage L);
497 /// A helper struct providing information about the byte size of DW_FORM
498 /// values that vary in size depending on the DWARF version, address byte
499 /// size, or DWARF32/DWARF64.
505 /// The definition of the size of form DW_FORM_ref_addr depends on the
506 /// version. In DWARF v2 it's the size of an address; after that, it's the
507 /// size of a reference.
508 uint8_t getRefAddrByteSize() const {
511 return getDwarfOffsetByteSize();
514 /// The size of a reference is determined by the DWARF 32/64-bit format.
515 uint8_t getDwarfOffsetByteSize() const {
517 case DwarfFormat::DWARF32:
519 case DwarfFormat::DWARF64:
522 llvm_unreachable("Invalid Format value");
525 explicit operator bool() const { return Version && AddrSize; }
528 /// Get the fixed byte size for a given form.
530 /// If the form has a fixed byte size, then an Optional with a value will be
531 /// returned. If the form is always encoded using a variable length storage
532 /// format (ULEB or SLEB numbers or blocks) then None will be returned.
534 /// \param Form DWARF form to get the fixed byte size for.
535 /// \param Params DWARF parameters to help interpret forms.
536 /// \returns Optional<uint8_t> value with the fixed byte size or None if
537 /// \p Form doesn't have a fixed byte size.
538 Optional<uint8_t> getFixedFormByteSize(dwarf::Form Form, FormParams Params);
540 /// Tells whether the specified form is defined in the specified version,
541 /// or is an extension if extensions are allowed.
542 bool isValidFormForVersion(Form F, unsigned Version, bool ExtensionsOk = true);
544 /// Returns the symbolic string representing Val when used as a value
545 /// for attribute Attr.
546 StringRef AttributeValueString(uint16_t Attr, unsigned Val);
548 /// Returns the symbolic string representing Val when used as a value
550 StringRef AtomValueString(uint16_t Atom, unsigned Val);
552 /// Describes an entry of the various gnu_pub* debug sections.
554 /// The gnu_pub* kind looks like:
558 /// 7 0 == global, 1 == static
560 /// A gdb_index descriptor includes the above kind, shifted 24 bits up with the
561 /// offset of the cu within the debug_info section stored in those 24 bits.
562 struct PubIndexEntryDescriptor {
563 GDBIndexEntryKind Kind;
564 GDBIndexEntryLinkage Linkage;
565 PubIndexEntryDescriptor(GDBIndexEntryKind Kind, GDBIndexEntryLinkage Linkage)
566 : Kind(Kind), Linkage(Linkage) {}
567 /* implicit */ PubIndexEntryDescriptor(GDBIndexEntryKind Kind)
568 : Kind(Kind), Linkage(GIEL_EXTERNAL) {}
569 explicit PubIndexEntryDescriptor(uint8_t Value)
571 static_cast<GDBIndexEntryKind>((Value & KIND_MASK) >> KIND_OFFSET)),
572 Linkage(static_cast<GDBIndexEntryLinkage>((Value & LINKAGE_MASK) >>
574 uint8_t toBits() const {
575 return Kind << KIND_OFFSET | Linkage << LINKAGE_OFFSET;
581 KIND_MASK = 7 << KIND_OFFSET,
583 LINKAGE_MASK = 1 << LINKAGE_OFFSET
587 template <typename Enum> struct EnumTraits : public std::false_type {};
589 template <> struct EnumTraits<Attribute> : public std::true_type {
590 static constexpr char Type[3] = "AT";
591 static constexpr StringRef (*StringFn)(unsigned) = &AttributeString;
594 template <> struct EnumTraits<Form> : public std::true_type {
595 static constexpr char Type[5] = "FORM";
596 static constexpr StringRef (*StringFn)(unsigned) = &FormEncodingString;
599 template <> struct EnumTraits<Index> : public std::true_type {
600 static constexpr char Type[4] = "IDX";
601 static constexpr StringRef (*StringFn)(unsigned) = &IndexString;
604 template <> struct EnumTraits<Tag> : public std::true_type {
605 static constexpr char Type[4] = "TAG";
606 static constexpr StringRef (*StringFn)(unsigned) = &TagString;
608 } // End of namespace dwarf
610 /// Dwarf constants format_provider
612 /// Specialization of the format_provider template for dwarf enums. Unlike the
613 /// dumping functions above, these format unknown enumerator values as
614 /// DW_TYPE_unknown_1234 (e.g. DW_TAG_unknown_ffff).
615 template <typename Enum>
616 struct format_provider<
617 Enum, typename std::enable_if<dwarf::EnumTraits<Enum>::value>::type> {
618 static void format(const Enum &E, raw_ostream &OS, StringRef Style) {
619 StringRef Str = dwarf::EnumTraits<Enum>::StringFn(E);
621 OS << "DW_" << dwarf::EnumTraits<Enum>::Type << "_unknown_"
622 << llvm::format("%x", E);
627 } // End of namespace llvm