elf: Extract glibcelf constants from <elf.h>

The need to maintain elf/elf.h and scripts/glibcelf.py in parallel
results in a backporting hazard: they need to be kept in sync to
avoid elf/tst-glibcelf consistency check failures.  glibcelf (unlike
tst-glibcelf) does not use the C implementation to extract constants.
This applies the additional glibcpp syntax checks to <elf.h>.

This  changereplaces the types derived from Python enum types with
custom types _TypedConstant, _IntConstant, and _FlagConstant.  These
types have fewer safeguards, but this also allows incremental
construction and greater flexibility for grouping constants among
the types.  Architectures-specific named constants are now added
as members into their superclasses (but value-based lookup is
still restricted to generic constants only).

Consequently, check_duplicates in elf/tst-glibcelf has been adjusted
to accept differently-named constants of the same value if their
subtypes are distinct.  The ordering check for named constants
has been dropped because they are no longer strictly ordered.

Further test adjustments: Some of the type names are different.
The new types do not support iteration (because it is unclear
whether iteration should cover the all named values (including
architecture-specific constants), or only the generic named values),
so elf/tst-glibcelf now uses by_name explicit (to get all constants).
PF_HP_SBP and PF_PARISC_SBP are now of distinct types (PfHP and
PfPARISC), so they are how both present on the Python side.  EM_NUM
and PT_NUM are filtered (which was an oversight in the old
conversion).

The new version of glibcelf should also be compatible with earlier
Python versions because it no longer depends on the enum module and its
advanced features.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

1 files changed, 375 insertions, 641 deletions

diff --git a/scripts/glibcelf.py b/scripts/glibcelf.py
index 5c8f46f590..420cb21943 100644
--- a/scripts/glibcelf.py
+++ b/scripts/glibcelf.py
@@ -25,711 +25,445 @@ parsing it.
 """
 
 import collections
-import enum
+import functools
+import os
 import struct
 
-if not hasattr(enum, 'IntFlag'):
-    import sys
-    sys.stdout.write(
-        'warning: glibcelf.py needs Python 3.6 for enum support\n')
-    sys.exit(77)
+import glibcpp
+
+class _MetaNamedValue(type):
+    """Used to set up _NamedValue subclasses."""
 
-class _OpenIntEnum(enum.IntEnum):
-    """Integer enumeration that supports arbitrary int values."""
     @classmethod
-    def _missing_(cls, value):
-        # See enum.IntFlag._create_pseudo_member_.  This allows
-        # creating of enum constants with arbitrary integer values.
-        pseudo_member = int.__new__(cls, value)
-        pseudo_member._name_ = None
-        pseudo_member._value_ = value
-        return pseudo_member
+    def __prepare__(metacls, cls, bases, **kwds):
+        # Indicates an int-based class.  Needed for types like Shn.
+        int_based = False
+        for base in bases:
+            if issubclass(base, int):
+                int_based = int
+                break
+        return dict(by_value={},
+                    by_name={},
+                    prefix=None,
+                    _int_based=int_based)
 
-    def __repr__(self):
-        name = self._name_
-        if name is not None:
-            # The names have prefixes like SHT_, implying their type.
-            return name
-        return '{}({})'.format(self.__class__.__name__, self._value_)
+    def __contains__(self, other):
+        return other in self.by_value
+
+class _NamedValue(metaclass=_MetaNamedValue):
+    """Typed, named integer constants.
+
+    Constants have the following instance attributes:
+
+    name: The full name of the constant (e.g., "PT_NULL").
+    short_name: The name with of the constant without the prefix ("NULL").
+    value: The integer value of the constant.
+
+    The following class attributes are available:
+
+    by_value: A dict mapping integers to constants.
+    by_name: A dict mapping strings to constants.
+    prefix: A string that is removed from the start of short names, or None.
+
+    """
+
+    def __new__(cls, arg0, arg1=None):
+        """Instance creation.
+
+        For the one-argument form, the argument must be a string, an
+        int, or an instance of this class.  Strings are looked up via
+        by_name.  Values are looked up via by_value; if value lookup
+        fails, a new unnamed instance is returned.  Instances of this
+        class a re returned as-is.
+
+        The two-argument form expects the name (a string) and the
+        value (an integer).  A new instance is created in this case.
+        The instance is not registered in the by_value/by_name
+        dictionaries (but the caller can do that).
+
+        """
+
+        typ0 = type(arg0)
+        if arg1 is None:
+            if isinstance(typ0, cls):
+                # Re-use the existing object.
+                return arg0
+            if typ0 is int:
+                by_value = cls.by_value
+                try:
+                    return by_value[arg0]
+                except KeyError:
+                    # Create a new object of the requested value.
+                    if cls._int_based:
+                        result = int.__new__(cls, arg0)
+                    else:
+                        result = object.__new__(cls)
+                    result.value = arg0
+                    result.name = None
+                    return result
+            if typ0 is str:
+                by_name = cls.by_name
+                try:
+                    return by_name[arg0]
+                except KeyError:
+                    raise ValueError('unknown {} constant: {!r}'.format(
+                        cls.__name__, arg0))
+        else:
+            # Types for the two-argument form are rigid.
+            if typ0 is not str and typ0 is not None:
+                raise ValueError('type {} of name {!r} should be str'.format(
+                    typ0.__name__, arg0))
+            if type(arg1) is not int:
+                raise ValueError('type {} of value {!r} should be int'.format(
+                    type(arg1).__name__, arg1))
+            # Create a new named constants.
+            if cls._int_based:
+                result = int.__new__(cls, arg1)
+            else:
+                result = object.__new__(cls)
+            result.value = arg1
+            result.name = arg0
+            # Set up the short_name attribute.
+            prefix = cls.prefix
+            if prefix and arg0.startswith(prefix):
+                result.short_name = arg0[len(prefix):]
+            else:
+                result.short_name = arg0
+            return result
 
     def __str__(self):
-        name = self._name_
-        if name is not None:
+        name = self.name
+        if name:
+            return name
+        else:
+            return str(self.value)
+
+    def __repr__(self):
+        name = self.name
+        if name:
             return name
-        return str(self._value_)
+        else:
+            return '{}({})'.format(self.__class__.__name__, self.value)
+
+    def __setattr__(self, name, value):
+        # Prevent modification of the critical attributes once they
+        # have been set.
+        if name in ('name', 'value', 'short_name') and hasattr(self, name):
+            raise AttributeError('can\'t set attribute {}'.format(name))
+        object.__setattr__(self, name, value)
+
+@functools.total_ordering
+class _TypedConstant(_NamedValue):
+    """Base class for integer-valued optionally named constants.
+
+    This type is not an integer type.
+
+    """
+
+    def __eq__(self, other):
+        return isinstance(other, self.__class__) and self.value == other.value
+
+    def __lt__(self, other):
+        return isinstance(other, self.__class__) and self.value <= other.value
+
+    def __hash__(self):
+        return hash(self.value)
+
+class _IntConstant(_NamedValue, int):
+    """Base class for integer-like optionally named constants.
+
+    Instances compare equal to the integer of the same value, and can
+    be used in integer arithmetic.
+
+    """
 
-class ElfClass(_OpenIntEnum):
+    pass
+
+class _FlagConstant(_TypedConstant, int):
+    pass
+
+def _parse_elf_h():
+    """Read ../elf/elf.h and return a dict with the constants in it."""
+
+    path = os.path.join(os.path.dirname(os.path.realpath(__file__)),
+                        '..', 'elf', 'elf.h')
+    class TokenizerReporter:
+        """Report tokenizer errors to standard output."""
+
+        def __init__(self):
+            self.errors = 0
+
+        def error(self, token, message):
+            self.errors += 1
+            print('{}:{}:{}: error: {}'.format(
+                path, token.line, token.column, message))
+
+    reporter = TokenizerReporter()
+    with open(path) as inp:
+        tokens = glibcpp.tokenize_c(inp.read(), reporter)
+    if reporter.errors:
+        raise IOError('parse error in elf.h')
+
+    class MacroReporter:
+        """Report macro errors to standard output."""
+
+        def __init__(self):
+            self.errors = 0
+
+        def error(self, line, message):
+            errors += 1
+            print('{}:{}: error: {}'.format(path, line, message))
+
+        def note(self, line, message):
+            print('{}:{}: note: {}'.format(path, line, message))
+
+    reporter = MacroReporter()
+    result = glibcpp.macro_eval(glibcpp.macro_definitions(tokens), reporter)
+    if reporter.errors:
+        raise IOError('parse error in elf.h')
+
+    return result
+_elf_h = _parse_elf_h()
+del _parse_elf_h
+_elf_h_processed = set()
+
+def _register_elf_h(cls, prefix=None, skip=(), ranges=False, parent=None):
+    prefix = prefix or cls.prefix
+    if not prefix:
+        raise ValueError('missing prefix for {}'.format(cls.__name__))
+    by_value = cls.by_value
+    by_name = cls.by_name
+    processed = _elf_h_processed
+
+    skip = set(skip)
+    skip.add(prefix + 'NUM')
+    if ranges:
+        skip.add(prefix + 'LOOS')
+        skip.add(prefix + 'HIOS')
+        skip.add(prefix + 'LOPROC')
+        skip.add(prefix + 'HIPROC')
+        cls.os_range = (_elf_h[prefix + 'LOOS'], _elf_h[prefix + 'HIOS'])
+        cls.proc_range = (_elf_h[prefix + 'LOPROC'], _elf_h[prefix + 'HIPROC'])
+
+    # Inherit the prefix from the parent if not set.
+    if parent and cls.prefix is None and parent.prefix is not None:
+        cls.prefix = parent.prefix
+
+    processed_len_start = len(processed)
+    for name, value in _elf_h.items():
+        if name in skip or name in processed:
+            continue
+        if name.startswith(prefix):
+            processed.add(name)
+            if value in by_value:
+                raise ValueError('duplicate value {}: {}, {}'.format(
+                    value, name, by_value[value]))
+            obj = cls(name, value)
+            by_value[value] = obj
+            by_name[name] = obj
+            setattr(cls, name, obj)
+            if parent:
+                # Make the symbolic name available through the parent as well.
+                parent.by_name[name] = obj
+                setattr(parent, name, obj)
+
+    if len(processed) == processed_len_start:
+        raise ValueError('nothing matched prefix {!r}'.format(prefix))
+
+class ElfClass(_TypedConstant):
     """ELF word size.  Type of EI_CLASS values."""
-    ELFCLASSNONE = 0
-    ELFCLASS32 = 1
-    ELFCLASS64 = 2
+_register_elf_h(ElfClass, prefix='ELFCLASS')
 
-class ElfData(_OpenIntEnum):
+class ElfData(_TypedConstant):
     """ELF endianess.  Type of EI_DATA values."""
-    ELFDATANONE = 0
-    ELFDATA2LSB = 1
-    ELFDATA2MSB = 2
+_register_elf_h(ElfData, prefix='ELFDATA')
 
-class Machine(_OpenIntEnum):
+class Machine(_TypedConstant):
     """ELF machine type.  Type of values in Ehdr.e_machine field."""
-    EM_NONE = 0
-    EM_M32 = 1
-    EM_SPARC = 2
-    EM_386 = 3
-    EM_68K = 4
-    EM_88K = 5
-    EM_IAMCU = 6
-    EM_860 = 7
-    EM_MIPS = 8
-    EM_S370 = 9
-    EM_MIPS_RS3_LE = 10
-    EM_PARISC = 15
-    EM_VPP500 = 17
-    EM_SPARC32PLUS = 18
-    EM_960 = 19
-    EM_PPC = 20
-    EM_PPC64 = 21
-    EM_S390 = 22
-    EM_SPU = 23
-    EM_V800 = 36
-    EM_FR20 = 37
-    EM_RH32 = 38
-    EM_RCE = 39
-    EM_ARM = 40
-    EM_FAKE_ALPHA = 41
-    EM_SH = 42
-    EM_SPARCV9 = 43
-    EM_TRICORE = 44
-    EM_ARC = 45
-    EM_H8_300 = 46
-    EM_H8_300H = 47
-    EM_H8S = 48
-    EM_H8_500 = 49
-    EM_IA_64 = 50
-    EM_MIPS_X = 51
-    EM_COLDFIRE = 52
-    EM_68HC12 = 53
-    EM_MMA = 54
-    EM_PCP = 55
-    EM_NCPU = 56
-    EM_NDR1 = 57
-    EM_STARCORE = 58
-    EM_ME16 = 59
-    EM_ST100 = 60
-    EM_TINYJ = 61
-    EM_X86_64 = 62
-    EM_PDSP = 63
-    EM_PDP10 = 64
-    EM_PDP11 = 65
-    EM_FX66 = 66
-    EM_ST9PLUS = 67
-    EM_ST7 = 68
-    EM_68HC16 = 69
-    EM_68HC11 = 70
-    EM_68HC08 = 71
-    EM_68HC05 = 72
-    EM_SVX = 73
-    EM_ST19 = 74
-    EM_VAX = 75
-    EM_CRIS = 76
-    EM_JAVELIN = 77
-    EM_FIREPATH = 78
-    EM_ZSP = 79
-    EM_MMIX = 80
-    EM_HUANY = 81
-    EM_PRISM = 82
-    EM_AVR = 83
-    EM_FR30 = 84
-    EM_D10V = 85
-    EM_D30V = 86
-    EM_V850 = 87
-    EM_M32R = 88
-    EM_MN10300 = 89
-    EM_MN10200 = 90
-    EM_PJ = 91
-    EM_OPENRISC = 92
-    EM_ARC_COMPACT = 93
-    EM_XTENSA = 94
-    EM_VIDEOCORE = 95
-    EM_TMM_GPP = 96
-    EM_NS32K = 97
-    EM_TPC = 98
-    EM_SNP1K = 99
-    EM_ST200 = 100
-    EM_IP2K = 101
-    EM_MAX = 102
-    EM_CR = 103
-    EM_F2MC16 = 104
-    EM_MSP430 = 105
-    EM_BLACKFIN = 106
-    EM_SE_C33 = 107
-    EM_SEP = 108
-    EM_ARCA = 109
-    EM_UNICORE = 110
-    EM_EXCESS = 111
-    EM_DXP = 112
-    EM_ALTERA_NIOS2 = 113
-    EM_CRX = 114
-    EM_XGATE = 115
-    EM_C166 = 116
-    EM_M16C = 117
-    EM_DSPIC30F = 118
-    EM_CE = 119
-    EM_M32C = 120
-    EM_TSK3000 = 131
-    EM_RS08 = 132
-    EM_SHARC = 133
-    EM_ECOG2 = 134
-    EM_SCORE7 = 135
-    EM_DSP24 = 136
-    EM_VIDEOCORE3 = 137
-    EM_LATTICEMICO32 = 138
-    EM_SE_C17 = 139
-    EM_TI_C6000 = 140
-    EM_TI_C2000 = 141
-    EM_TI_C5500 = 142
-    EM_TI_ARP32 = 143
-    EM_TI_PRU = 144
-    EM_MMDSP_PLUS = 160
-    EM_CYPRESS_M8C = 161
-    EM_R32C = 162
-    EM_TRIMEDIA = 163
-    EM_QDSP6 = 164
-    EM_8051 = 165
-    EM_STXP7X = 166
-    EM_NDS32 = 167
-    EM_ECOG1X = 168
-    EM_MAXQ30 = 169
-    EM_XIMO16 = 170
-    EM_MANIK = 171
-    EM_CRAYNV2 = 172
-    EM_RX = 173
-    EM_METAG = 174
-    EM_MCST_ELBRUS = 175
-    EM_ECOG16 = 176
-    EM_CR16 = 177
-    EM_ETPU = 178
-    EM_SLE9X = 179
-    EM_L10M = 180
-    EM_K10M = 181
-    EM_AARCH64 = 183
-    EM_AVR32 = 185
-    EM_STM8 = 186
-    EM_TILE64 = 187
-    EM_TILEPRO = 188
-    EM_MICROBLAZE = 189
-    EM_CUDA = 190
-    EM_TILEGX = 191
-    EM_CLOUDSHIELD = 192
-    EM_COREA_1ST = 193
-    EM_COREA_2ND = 194
-    EM_ARCV2 = 195
-    EM_OPEN8 = 196
-    EM_RL78 = 197
-    EM_VIDEOCORE5 = 198
-    EM_78KOR = 199
-    EM_56800EX = 200
-    EM_BA1 = 201
-    EM_BA2 = 202
-    EM_XCORE = 203
-    EM_MCHP_PIC = 204
-    EM_INTELGT = 205
-    EM_KM32 = 210
-    EM_KMX32 = 211
-    EM_EMX16 = 212
-    EM_EMX8 = 213
-    EM_KVARC = 214
-    EM_CDP = 215
-    EM_COGE = 216
-    EM_COOL = 217
-    EM_NORC = 218
-    EM_CSR_KALIMBA = 219
-    EM_Z80 = 220
-    EM_VISIUM = 221
-    EM_FT32 = 222
-    EM_MOXIE = 223
-    EM_AMDGPU = 224
-    EM_RISCV = 243
-    EM_BPF = 247
-    EM_CSKY = 252
-    EM_LOONGARCH = 258
-    EM_NUM = 259
-    EM_ALPHA = 0x9026
-
-class Et(_OpenIntEnum):
+    prefix = 'EM_'
+_register_elf_h(Machine, skip=('EM_ARC_A5',))
+
+class Et(_TypedConstant):
     """ELF file type.  Type of ET_* values and the Ehdr.e_type field."""
-    ET_NONE = 0
-    ET_REL = 1
-    ET_EXEC = 2
-    ET_DYN = 3
-    ET_CORE = 4
+    prefix = 'ET_'
+_register_elf_h(Et, ranges=True)
 
-class Shn(_OpenIntEnum):
+class Shn(_IntConstant):
     """ELF reserved section indices."""
-    SHN_UNDEF = 0
-    SHN_BEFORE = 0xff00
-    SHN_AFTER = 0xff01
-    SHN_ABS = 0xfff1
-    SHN_COMMON = 0xfff2
-    SHN_XINDEX = 0xffff
-
-class ShnMIPS(enum.Enum):
+    prefix = 'SHN_'
+class ShnMIPS(Shn):
     """Supplemental SHN_* constants for EM_MIPS."""
-    SHN_MIPS_ACOMMON = 0xff00
-    SHN_MIPS_TEXT = 0xff01
-    SHN_MIPS_DATA = 0xff02
-    SHN_MIPS_SCOMMON = 0xff03
-    SHN_MIPS_SUNDEFINED = 0xff04
-
-class ShnPARISC(enum.Enum):
+class ShnPARISC(Shn):
     """Supplemental SHN_* constants for EM_PARISC."""
-    SHN_PARISC_ANSI_COMMON = 0xff00
-    SHN_PARISC_HUGE_COMMON = 0xff01
+_register_elf_h(ShnMIPS, prefix='SHN_MIPS_', parent=Shn)
+_register_elf_h(ShnPARISC, prefix='SHN_PARISC_', parent=Shn)
+_register_elf_h(Shn, skip='SHN_LORESERVE SHN_HIRESERVE'.split(), ranges=True)
 
-class Sht(_OpenIntEnum):
+class Sht(_TypedConstant):
     """ELF section types.  Type of SHT_* values."""
-    SHT_NULL = 0
-    SHT_PROGBITS = 1
-    SHT_SYMTAB = 2
-    SHT_STRTAB = 3
-    SHT_RELA = 4
-    SHT_HASH = 5
-    SHT_DYNAMIC = 6
-    SHT_NOTE = 7
-    SHT_NOBITS = 8
-    SHT_REL = 9
-    SHT_SHLIB = 10
-    SHT_DYNSYM = 11
-    SHT_INIT_ARRAY = 14
-    SHT_FINI_ARRAY = 15
-    SHT_PREINIT_ARRAY = 16
-    SHT_GROUP = 17
-    SHT_SYMTAB_SHNDX = 18
-    SHT_RELR = 19
-    SHT_GNU_ATTRIBUTES = 0x6ffffff5
-    SHT_GNU_HASH = 0x6ffffff6
-    SHT_GNU_LIBLIST = 0x6ffffff7
-    SHT_CHECKSUM = 0x6ffffff8
-    SHT_SUNW_move = 0x6ffffffa
-    SHT_SUNW_COMDAT = 0x6ffffffb
-    SHT_SUNW_syminfo = 0x6ffffffc
-    SHT_GNU_verdef = 0x6ffffffd
-    SHT_GNU_verneed = 0x6ffffffe
-    SHT_GNU_versym = 0x6fffffff
-
-class ShtALPHA(enum.Enum):
+    prefix = 'SHT_'
+class ShtALPHA(Sht):
     """Supplemental SHT_* constants for EM_ALPHA."""
-    SHT_ALPHA_DEBUG = 0x70000001
-    SHT_ALPHA_REGINFO = 0x70000002
-
-class ShtARM(enum.Enum):
+class ShtARM(Sht):
     """Supplemental SHT_* constants for EM_ARM."""
-    SHT_ARM_EXIDX = 0x70000001
-    SHT_ARM_PREEMPTMAP = 0x70000002
-    SHT_ARM_ATTRIBUTES = 0x70000003
-
-class ShtCSKY(enum.Enum):
+class ShtCSKY(Sht):
     """Supplemental SHT_* constants for EM_CSKY."""
-    SHT_CSKY_ATTRIBUTES = 0x70000001
-
-class ShtIA_64(enum.Enum):
+class ShtIA_64(Sht):
     """Supplemental SHT_* constants for EM_IA_64."""
-    SHT_IA_64_EXT = 0x70000000
-    SHT_IA_64_UNWIND = 0x70000001
-
-class ShtMIPS(enum.Enum):
+class ShtMIPS(Sht):
     """Supplemental SHT_* constants for EM_MIPS."""
-    SHT_MIPS_LIBLIST = 0x70000000
-    SHT_MIPS_MSYM = 0x70000001
-    SHT_MIPS_CONFLICT = 0x70000002
-    SHT_MIPS_GPTAB = 0x70000003
-    SHT_MIPS_UCODE = 0x70000004
-    SHT_MIPS_DEBUG = 0x70000005
-    SHT_MIPS_REGINFO = 0x70000006
-    SHT_MIPS_PACKAGE = 0x70000007
-    SHT_MIPS_PACKSYM = 0x70000008
-    SHT_MIPS_RELD = 0x70000009
-    SHT_MIPS_IFACE = 0x7000000b
-    SHT_MIPS_CONTENT = 0x7000000c
-    SHT_MIPS_OPTIONS = 0x7000000d
-    SHT_MIPS_SHDR = 0x70000010
-    SHT_MIPS_FDESC = 0x70000011
-    SHT_MIPS_EXTSYM = 0x70000012
-    SHT_MIPS_DENSE = 0x70000013
-    SHT_MIPS_PDESC = 0x70000014
-    SHT_MIPS_LOCSYM = 0x70000015
-    SHT_MIPS_AUXSYM = 0x70000016
-    SHT_MIPS_OPTSYM = 0x70000017
-    SHT_MIPS_LOCSTR = 0x70000018
-    SHT_MIPS_LINE = 0x70000019
-    SHT_MIPS_RFDESC = 0x7000001a
-    SHT_MIPS_DELTASYM = 0x7000001b
-    SHT_MIPS_DELTAINST = 0x7000001c
-    SHT_MIPS_DELTACLASS = 0x7000001d
-    SHT_MIPS_DWARF = 0x7000001e
-    SHT_MIPS_DELTADECL = 0x7000001f
-    SHT_MIPS_SYMBOL_LIB = 0x70000020
-    SHT_MIPS_EVENTS = 0x70000021
-    SHT_MIPS_TRANSLATE = 0x70000022
-    SHT_MIPS_PIXIE = 0x70000023
-    SHT_MIPS_XLATE = 0x70000024
-    SHT_MIPS_XLATE_DEBUG = 0x70000025
-    SHT_MIPS_WHIRL = 0x70000026
-    SHT_MIPS_EH_REGION = 0x70000027
-    SHT_MIPS_XLATE_OLD = 0x70000028
-    SHT_MIPS_PDR_EXCEPTION = 0x70000029
-    SHT_MIPS_XHASH = 0x7000002b
-
-class ShtPARISC(enum.Enum):
+class ShtPARISC(Sht):
     """Supplemental SHT_* constants for EM_PARISC."""
-    SHT_PARISC_EXT = 0x70000000
-    SHT_PARISC_UNWIND = 0x70000001
-    SHT_PARISC_DOC = 0x70000002
-
-class ShtRISCV(enum.Enum):
+class ShtRISCV(Sht):
     """Supplemental SHT_* constants for EM_RISCV."""
-    SHT_RISCV_ATTRIBUTES = 0x70000003
-
-class Pf(enum.IntFlag):
+_register_elf_h(ShtALPHA, prefix='SHT_ALPHA_', parent=Sht)
+_register_elf_h(ShtARM, prefix='SHT_ARM_', parent=Sht)
+_register_elf_h(ShtCSKY, prefix='SHT_CSKY_', parent=Sht)
+_register_elf_h(ShtIA_64, prefix='SHT_IA_64_', parent=Sht)
+_register_elf_h(ShtMIPS, prefix='SHT_MIPS_', parent=Sht)
+_register_elf_h(ShtPARISC, prefix='SHT_PARISC_', parent=Sht)
+_register_elf_h(ShtRISCV, prefix='SHT_RISCV_', parent=Sht)
+_register_elf_h(Sht, ranges=True,
+                skip='SHT_LOSUNW SHT_HISUNW SHT_LOUSER SHT_HIUSER'.split())
+
+class Pf(_FlagConstant):
     """Program header flags.  Type of Phdr.p_flags values."""
-    PF_X = 1
-    PF_W = 2
-    PF_R = 4
-
-class PfARM(enum.IntFlag):
+    prefix = 'PF_'
+class PfARM(Pf):
     """Supplemental PF_* flags for EM_ARM."""
-    PF_ARM_SB = 0x10000000
-    PF_ARM_PI = 0x20000000
-    PF_ARM_ABS = 0x40000000
-
-class PfPARISC(enum.IntFlag):
-    """Supplemental PF_* flags for EM_PARISC."""
-    PF_HP_PAGE_SIZE = 0x00100000
-    PF_HP_FAR_SHARED = 0x00200000
-    PF_HP_NEAR_SHARED = 0x00400000
-    PF_HP_CODE = 0x01000000
-    PF_HP_MODIFY = 0x02000000
-    PF_HP_LAZYSWAP = 0x04000000
-    PF_HP_SBP = 0x08000000
-
-class PfIA_64(enum.IntFlag):
+class PfHP(Pf):
+    """Supplemental PF_* flags for HP-UX."""
+class PfIA_64(Pf):
     """Supplemental PF_* flags for EM_IA_64."""
-    PF_IA_64_NORECOV = 0x80000000
-
-class PfMIPS(enum.IntFlag):
+class PfMIPS(Pf):
     """Supplemental PF_* flags for EM_MIPS."""
-    PF_MIPS_LOCAL = 0x10000000
-
-class Shf(enum.IntFlag):
+class PfPARISC(Pf):
+    """Supplemental PF_* flags for EM_PARISC."""
+_register_elf_h(PfARM, prefix='PF_ARM_', parent=Pf)
+_register_elf_h(PfHP, prefix='PF_HP_', parent=Pf)
+_register_elf_h(PfIA_64, prefix='PF_IA_64_', parent=Pf)
+_register_elf_h(PfMIPS, prefix='PF_MIPS_', parent=Pf)
+_register_elf_h(PfPARISC, prefix='PF_PARISC_', parent=Pf)
+_register_elf_h(Pf, skip='PF_MASKOS PF_MASKPROC'.split())
+
+class Shf(_FlagConstant):
     """Section flags.  Type of Shdr.sh_type values."""
-    SHF_WRITE = 1 << 0
-    SHF_ALLOC = 1 << 1
-    SHF_EXECINSTR = 1 << 2
-    SHF_MERGE = 1 << 4
-    SHF_STRINGS = 1 << 5
-    SHF_INFO_LINK = 1 << 6
-    SHF_LINK_ORDER = 1 << 7
-    SHF_OS_NONCONFORMING = 256
-    SHF_GROUP = 1 << 9
-    SHF_TLS = 1 << 10
-    SHF_COMPRESSED = 1 << 11
-    SHF_GNU_RETAIN = 1 << 21
-    SHF_ORDERED = 1 << 30
-    SHF_EXCLUDE = 1 << 31
-
-class ShfALPHA(enum.IntFlag):
+    prefix = 'SHF_'
+class ShfALPHA(Shf):
     """Supplemental SHF_* constants for EM_ALPHA."""
-    SHF_ALPHA_GPREL = 0x10000000
-
-class ShfARM(enum.IntFlag):
+class ShfARM(Shf):
     """Supplemental SHF_* constants for EM_ARM."""
-    SHF_ARM_ENTRYSECT = 0x10000000
-    SHF_ARM_COMDEF = 0x80000000
-
-class ShfIA_64(enum.IntFlag):
+class ShfIA_64(Shf):
     """Supplemental SHF_* constants for EM_IA_64."""
-    SHF_IA_64_SHORT  = 0x10000000
-    SHF_IA_64_NORECOV = 0x20000000
-
-class ShfMIPS(enum.IntFlag):
+class ShfMIPS(Shf):
     """Supplemental SHF_* constants for EM_MIPS."""
-    SHF_MIPS_GPREL = 0x10000000
-    SHF_MIPS_MERGE = 0x20000000
-    SHF_MIPS_ADDR = 0x40000000
-    SHF_MIPS_STRINGS = 0x80000000
-    SHF_MIPS_NOSTRIP = 0x08000000
-    SHF_MIPS_LOCAL = 0x04000000
-    SHF_MIPS_NAMES = 0x02000000
-    SHF_MIPS_NODUPE = 0x01000000
-
-class ShfPARISC(enum.IntFlag):
+class ShfPARISC(Shf):
     """Supplemental SHF_* constants for EM_PARISC."""
-    SHF_PARISC_SHORT = 0x20000000
-    SHF_PARISC_HUGE = 0x40000000
-    SHF_PARISC_SBP = 0x80000000
-
-class Stb(_OpenIntEnum):
+_register_elf_h(ShfALPHA, prefix='SHF_ALPHA_', parent=Shf)
+_register_elf_h(ShfARM, prefix='SHF_ARM_', parent=Shf)
+_register_elf_h(ShfIA_64, prefix='SHF_IA_64_', parent=Shf)
+_register_elf_h(ShfMIPS, prefix='SHF_MIPS_', parent=Shf)
+_register_elf_h(ShfPARISC, prefix='SHF_PARISC_', parent=Shf)
+_register_elf_h(Shf, skip='SHF_MASKOS SHF_MASKPROC'.split())
+
+class Stb(_TypedConstant):
     """ELF symbol binding type."""
-    STB_LOCAL = 0
-    STB_GLOBAL = 1
-    STB_WEAK = 2
-    STB_GNU_UNIQUE = 10
-    STB_MIPS_SPLIT_COMMON = 13
+    prefix = 'STB_'
+_register_elf_h(Stb, ranges=True)
 
-class Stt(_OpenIntEnum):
+class Stt(_TypedConstant):
     """ELF symbol type."""
-    STT_NOTYPE = 0
-    STT_OBJECT = 1
-    STT_FUNC = 2
-    STT_SECTION = 3
-    STT_FILE = 4
-    STT_COMMON = 5
-    STT_TLS = 6
-    STT_GNU_IFUNC = 10
-
-class SttARM(enum.Enum):
+    prefix = 'STT_'
+class SttARM(Sht):
     """Supplemental STT_* constants for EM_ARM."""
-    STT_ARM_TFUNC = 13
-    STT_ARM_16BIT = 15
-
-class SttPARISC(enum.Enum):
+class SttPARISC(Sht):
     """Supplemental STT_* constants for EM_PARISC."""
-    STT_HP_OPAQUE = 11
-    STT_HP_STUB = 12
-    STT_PARISC_MILLICODE = 13
-
-class SttSPARC(enum.Enum):
+class SttSPARC(Sht):
     """Supplemental STT_* constants for EM_SPARC."""
     STT_SPARC_REGISTER = 13
-
-class SttX86_64(enum.Enum):
+class SttX86_64(Sht):
     """Supplemental STT_* constants for EM_X86_64."""
-    SHT_X86_64_UNWIND = 0x70000001
+_register_elf_h(SttARM, prefix='STT_ARM_', parent=Stt)
+_register_elf_h(SttPARISC, prefix='STT_PARISC_', parent=Stt)
+_register_elf_h(SttSPARC, prefix='STT_SPARC_', parent=Stt)
+_register_elf_h(Stt, ranges=True)
+
 
-class Pt(_OpenIntEnum):
+class Pt(_TypedConstant):
     """ELF program header types.  Type of Phdr.p_type."""
-    PT_NULL = 0
-    PT_LOAD = 1
-    PT_DYNAMIC = 2
-    PT_INTERP = 3
-    PT_NOTE = 4
-    PT_SHLIB = 5
-    PT_PHDR = 6
-    PT_TLS = 7
-    PT_NUM = 8
-    PT_GNU_EH_FRAME = 0x6474e550
-    PT_GNU_STACK = 0x6474e551
-    PT_GNU_RELRO = 0x6474e552
-    PT_GNU_PROPERTY = 0x6474e553
-    PT_SUNWBSS = 0x6ffffffa
-    PT_SUNWSTACK = 0x6ffffffb
-
-class PtAARCH64(enum.Enum):
+    prefix = 'PT_'
+class PtAARCH64(Pt):
     """Supplemental PT_* constants for EM_AARCH64."""
-    PT_AARCH64_MEMTAG_MTE = 0x70000002
-
-class PtARM(enum.Enum):
+class PtARM(Pt):
     """Supplemental PT_* constants for EM_ARM."""
-    PT_ARM_EXIDX = 0x70000001
-
-class PtIA_64(enum.Enum):
+class PtHP(Pt):
+    """Supplemental PT_* constants for HP-U."""
+class PtIA_64(Pt):
     """Supplemental PT_* constants for EM_IA_64."""
-    PT_IA_64_HP_OPT_ANOT = 0x60000012
-    PT_IA_64_HP_HSL_ANOT = 0x60000013
-    PT_IA_64_HP_STACK = 0x60000014
-    PT_IA_64_ARCHEXT = 0x70000000
-    PT_IA_64_UNWIND = 0x70000001
-
-class PtMIPS(enum.Enum):
+class PtMIPS(Pt):
     """Supplemental PT_* constants for EM_MIPS."""
-    PT_MIPS_REGINFO = 0x70000000
-    PT_MIPS_RTPROC = 0x70000001
-    PT_MIPS_OPTIONS = 0x70000002
-    PT_MIPS_ABIFLAGS = 0x70000003
-
-class PtPARISC(enum.Enum):
+class PtPARISC(Pt):
     """Supplemental PT_* constants for EM_PARISC."""
-    PT_HP_TLS = 0x60000000
-    PT_HP_CORE_NONE = 0x60000001
-    PT_HP_CORE_VERSION = 0x60000002
-    PT_HP_CORE_KERNEL = 0x60000003
-    PT_HP_CORE_COMM = 0x60000004
-    PT_HP_CORE_PROC = 0x60000005
-    PT_HP_CORE_LOADABLE = 0x60000006
-    PT_HP_CORE_STACK = 0x60000007
-    PT_HP_CORE_SHM = 0x60000008
-    PT_HP_CORE_MMF = 0x60000009
-    PT_HP_PARALLEL = 0x60000010
-    PT_HP_FASTBIND = 0x60000011
-    PT_HP_OPT_ANNOT = 0x60000012
-    PT_HP_HSL_ANNOT = 0x60000013
-    PT_HP_STACK = 0x60000014
-    PT_PARISC_ARCHEXT = 0x70000000
-    PT_PARISC_UNWIND = 0x70000001
-
-class PtRISCV(enum.Enum):
+class PtRISCV(Pt):
     """Supplemental PT_* constants for EM_RISCV."""
-    PT_RISCV_ATTRIBUTES = 0x70000003
-
-class Dt(_OpenIntEnum):
+_register_elf_h(PtAARCH64, prefix='PT_AARCH64_', parent=Pt)
+_register_elf_h(PtARM, prefix='PT_ARM_', parent=Pt)
+_register_elf_h(PtHP, prefix='PT_HP_', parent=Pt)
+_register_elf_h(PtIA_64, prefix='PT_IA_64_', parent=Pt)
+_register_elf_h(PtMIPS, prefix='PT_MIPS_', parent=Pt)
+_register_elf_h(PtPARISC, prefix='PT_PARISC_', parent=Pt)
+_register_elf_h(PtRISCV, prefix='PT_RISCV_', parent=Pt)
+_register_elf_h(Pt, skip='PT_LOSUNW PT_HISUNW'.split(), ranges=True)
+
+class Dt(_TypedConstant):
     """ELF dynamic segment tags.  Type of Dyn.d_val."""
-    DT_NULL = 0
-    DT_NEEDED = 1
-    DT_PLTRELSZ = 2
-    DT_PLTGOT = 3
-    DT_HASH = 4
-    DT_STRTAB = 5
-    DT_SYMTAB = 6
-    DT_RELA = 7
-    DT_RELASZ = 8
-    DT_RELAENT = 9
-    DT_STRSZ = 10
-    DT_SYMENT = 11
-    DT_INIT = 12
-    DT_FINI = 13
-    DT_SONAME = 14
-    DT_RPATH = 15
-    DT_SYMBOLIC = 16
-    DT_REL = 17
-    DT_RELSZ = 18
-    DT_RELENT = 19
-    DT_PLTREL = 20
-    DT_DEBUG = 21
-    DT_TEXTREL = 22
-    DT_JMPREL = 23
-    DT_BIND_NOW = 24
-    DT_INIT_ARRAY = 25
-    DT_FINI_ARRAY = 26
-    DT_INIT_ARRAYSZ = 27
-    DT_FINI_ARRAYSZ = 28
-    DT_RUNPATH = 29
-    DT_FLAGS = 30
-    DT_PREINIT_ARRAY = 32
-    DT_PREINIT_ARRAYSZ = 33
-    DT_SYMTAB_SHNDX = 34
-    DT_RELRSZ = 35
-    DT_RELR = 36
-    DT_RELRENT = 37
-    DT_GNU_PRELINKED = 0x6ffffdf5
-    DT_GNU_CONFLICTSZ = 0x6ffffdf6
-    DT_GNU_LIBLISTSZ = 0x6ffffdf7
-    DT_CHECKSUM = 0x6ffffdf8
-    DT_PLTPADSZ = 0x6ffffdf9
-    DT_MOVEENT = 0x6ffffdfa
-    DT_MOVESZ = 0x6ffffdfb
-    DT_FEATURE_1 = 0x6ffffdfc
-    DT_POSFLAG_1 = 0x6ffffdfd
-    DT_SYMINSZ = 0x6ffffdfe
-    DT_SYMINENT = 0x6ffffdff
-    DT_GNU_HASH = 0x6ffffef5
-    DT_TLSDESC_PLT = 0x6ffffef6
-    DT_TLSDESC_GOT = 0x6ffffef7
-    DT_GNU_CONFLICT = 0x6ffffef8
-    DT_GNU_LIBLIST = 0x6ffffef9
-    DT_CONFIG = 0x6ffffefa
-    DT_DEPAUDIT = 0x6ffffefb
-    DT_AUDIT = 0x6ffffefc
-    DT_PLTPAD = 0x6ffffefd
-    DT_MOVETAB = 0x6ffffefe
-    DT_SYMINFO = 0x6ffffeff
-    DT_VERSYM = 0x6ffffff0
-    DT_RELACOUNT = 0x6ffffff9
-    DT_RELCOUNT = 0x6ffffffa
-    DT_FLAGS_1 = 0x6ffffffb
-    DT_VERDEF = 0x6ffffffc
-    DT_VERDEFNUM = 0x6ffffffd
-    DT_VERNEED = 0x6ffffffe
-    DT_VERNEEDNUM = 0x6fffffff
-    DT_AUXILIARY = 0x7ffffffd
-    DT_FILTER = 0x7fffffff
-
-class DtAARCH64(enum.Enum):
+    prefix = 'DT_'
+class DtAARCH64(Dt):
     """Supplemental DT_* constants for EM_AARCH64."""
-    DT_AARCH64_BTI_PLT = 0x70000001
-    DT_AARCH64_PAC_PLT = 0x70000003
-    DT_AARCH64_VARIANT_PCS = 0x70000005
-
-class DtALPHA(enum.Enum):
+class DtALPHA(Dt):
     """Supplemental DT_* constants for EM_ALPHA."""
-    DT_ALPHA_PLTRO = 0x70000000
-
-class DtALTERA_NIOS2(enum.Enum):
+class DtALTERA_NIOS2(Dt):
     """Supplemental DT_* constants for EM_ALTERA_NIOS2."""
-    DT_NIOS2_GP = 0x70000002
-
-class DtIA_64(enum.Enum):
+class DtIA_64(Dt):
     """Supplemental DT_* constants for EM_IA_64."""
-    DT_IA_64_PLT_RESERVE = 0x70000000
-
-class DtMIPS(enum.Enum):
+class DtMIPS(Dt):
     """Supplemental DT_* constants for EM_MIPS."""
-    DT_MIPS_RLD_VERSION = 0x70000001
-    DT_MIPS_TIME_STAMP = 0x70000002
-    DT_MIPS_ICHECKSUM = 0x70000003
-    DT_MIPS_IVERSION = 0x70000004
-    DT_MIPS_FLAGS = 0x70000005
-    DT_MIPS_BASE_ADDRESS = 0x70000006
-    DT_MIPS_MSYM = 0x70000007
-    DT_MIPS_CONFLICT = 0x70000008
-    DT_MIPS_LIBLIST = 0x70000009
-    DT_MIPS_LOCAL_GOTNO = 0x7000000a
-    DT_MIPS_CONFLICTNO = 0x7000000b
-    DT_MIPS_LIBLISTNO = 0x70000010
-    DT_MIPS_SYMTABNO = 0x70000011
-    DT_MIPS_UNREFEXTNO = 0x70000012
-    DT_MIPS_GOTSYM = 0x70000013
-    DT_MIPS_HIPAGENO = 0x70000014
-    DT_MIPS_RLD_MAP = 0x70000016
-    DT_MIPS_DELTA_CLASS = 0x70000017
-    DT_MIPS_DELTA_CLASS_NO = 0x70000018
-    DT_MIPS_DELTA_INSTANCE = 0x70000019
-    DT_MIPS_DELTA_INSTANCE_NO = 0x7000001a
-    DT_MIPS_DELTA_RELOC = 0x7000001b
-    DT_MIPS_DELTA_RELOC_NO = 0x7000001c
-    DT_MIPS_DELTA_SYM = 0x7000001d
-    DT_MIPS_DELTA_SYM_NO = 0x7000001e
-    DT_MIPS_DELTA_CLASSSYM = 0x70000020
-    DT_MIPS_DELTA_CLASSSYM_NO = 0x70000021
-    DT_MIPS_CXX_FLAGS = 0x70000022
-    DT_MIPS_PIXIE_INIT = 0x70000023
-    DT_MIPS_SYMBOL_LIB = 0x70000024
-    DT_MIPS_LOCALPAGE_GOTIDX = 0x70000025
-    DT_MIPS_LOCAL_GOTIDX = 0x70000026
-    DT_MIPS_HIDDEN_GOTIDX = 0x70000027
-    DT_MIPS_PROTECTED_GOTIDX = 0x70000028
-    DT_MIPS_OPTIONS = 0x70000029
-    DT_MIPS_INTERFACE = 0x7000002a
-    DT_MIPS_DYNSTR_ALIGN = 0x7000002b
-    DT_MIPS_INTERFACE_SIZE = 0x7000002c
-    DT_MIPS_RLD_TEXT_RESOLVE_ADDR = 0x7000002d
-    DT_MIPS_PERF_SUFFIX = 0x7000002e
-    DT_MIPS_COMPACT_SIZE = 0x7000002f
-    DT_MIPS_GP_VALUE = 0x70000030
-    DT_MIPS_AUX_DYNAMIC = 0x70000031
-    DT_MIPS_PLTGOT = 0x70000032
-    DT_MIPS_RWPLT = 0x70000034
-    DT_MIPS_RLD_MAP_REL = 0x70000035
-    DT_MIPS_XHASH = 0x70000036
-
-class DtPPC(enum.Enum):
+class DtPPC(Dt):
     """Supplemental DT_* constants for EM_PPC."""
-    DT_PPC_GOT = 0x70000000
-    DT_PPC_OPT = 0x70000001
-
-class DtPPC64(enum.Enum):
+class DtPPC64(Dt):
     """Supplemental DT_* constants for EM_PPC64."""
-    DT_PPC64_GLINK = 0x70000000
-    DT_PPC64_OPD = 0x70000001
-    DT_PPC64_OPDSZ = 0x70000002
-    DT_PPC64_OPT = 0x70000003
-
-class DtRISCV(enum.Enum):
+class DtRISCV(Dt):
     """Supplemental DT_* constants for EM_RISCV."""
-    DT_RISCV_VARIANT_CC = 0x70000001
-
-class DtSPARC(enum.Enum):
+class DtSPARC(Dt):
     """Supplemental DT_* constants for EM_SPARC."""
-    DT_SPARC_REGISTER = 0x70000001
+_dt_skip = '''
+DT_ENCODING DT_PROCNUM
+DT_ADDRRNGLO DT_ADDRRNGHI DT_ADDRNUM
+DT_VALRNGLO DT_VALRNGHI DT_VALNUM
+DT_VERSIONTAGNUM DT_EXTRANUM
+DT_AARCH64_NUM
+DT_ALPHA_NUM
+DT_IA_64_NUM
+DT_MIPS_NUM
+DT_PPC_NUM
+DT_PPC64_NUM
+DT_SPARC_NUM
+'''.strip().split()
+_register_elf_h(DtAARCH64, prefix='DT_AARCH64_', skip=_dt_skip, parent=Dt)
+_register_elf_h(DtALPHA, prefix='DT_ALPHA_', skip=_dt_skip, parent=Dt)
+_register_elf_h(DtALTERA_NIOS2, prefix='DT_NIOS2_', skip=_dt_skip, parent=Dt)
+_register_elf_h(DtIA_64, prefix='DT_IA_64_', skip=_dt_skip, parent=Dt)
+_register_elf_h(DtMIPS, prefix='DT_MIPS_', skip=_dt_skip, parent=Dt)
+_register_elf_h(DtPPC, prefix='DT_PPC_', skip=_dt_skip, parent=Dt)
+_register_elf_h(DtPPC64, prefix='DT_PPC64_', skip=_dt_skip, parent=Dt)
+_register_elf_h(DtRISCV, prefix='DT_RISCV_', skip=_dt_skip, parent=Dt)
+_register_elf_h(DtSPARC, prefix='DT_SPARC_', skip=_dt_skip, parent=Dt)
+_register_elf_h(Dt, skip=_dt_skip, ranges=True)
+del _dt_skip
+
+# Constant extraction is complete.
+del _register_elf_h
+del _elf_h
 
 class StInfo:
     """ELF symbol binding and type.  Type of the Sym.st_info field."""