Change DT_* value definitions to macros in a separate file

[arichardson]

Summary

I recently added a new dynamic tag to our fork of LLVM and when adding it
to llvm-readobj I noticed that not all DT_ values were being handled there.

Using macros in a .def file that can be included by both ELFDumper.cpp and
the ELF.h header ensures that the two don't get out of sync when new values
are added.

[arichardson]

Use correct version of diff

[grimar]

This looks OK to me. Let's see what other reviewers think, my comments below.

include/llvm/BinaryFormat/DynamicTags.def

1

Excessive empty line.

8

I am not sure it is worth to mention the particular tool name here, as such file can be used for very different purposes I think.

tools/llvm-readobj/ELFDumper.cpp

1548

Personally to me one-line short form here and below looks easier to read:

#define HEXAGON_DYNAMIC_TAG(name, value) case DT_##name: return #name;

1569

This undef should be right after the end of the first switch I think.

1582

This looks to be dead now.

[• espindola]

I agree with George's comments, but LGTM otherwise.

[arichardson]

Address review comments

include/llvm/BinaryFormat/DynamicTags.def

1

I did this for consistency with ElfRelocs/X86_64.def which also adds a newline here. Happy to remove it though since I also think it looks a bit strange.

It seems all the files in that folder except AMDGPU.def and BPF.def have that newline.

tools/llvm-readobj/ELFDumper.cpp

1548

This is what git-clang-format did to the file but I agree the short version is easier to understand. Fixed.

[grimar]

LGTM

tools/llvm-readobj/ELFDumper.cpp

1548

Ah :( We probably should go with formatted version then.
That's unfortunate.

[• espindola]

LGTM, but do use the git-clang-formated version.

include/llvm/BinaryFormat/DynamicTags.def

+
+#ifndef DYNAMIC_TAG
+#error "DYNAMIC_TAG must be defined"
+#endif
+
+// Add separate macros for the architecture specific tags and the markers
+// such as DT_HIOS, etc. to allow using this file to construct the
+// stringification switch statement for llvm-readobj
+
+#ifndef HEXAGON_DYNAMIC_TAG
+#define HEXAGON_DYNAMIC_TAG(name, value) DYNAMIC_TAG(name, value)
+#define HEXAGON_DYNAMIC_TAG_DEFINED
+#endif
+
+#ifndef MIPS_DYNAMIC_TAG
+#define MIPS_DYNAMIC_TAG(name, value) DYNAMIC_TAG(name, value)
+#define MIPS_DYNAMIC_TAG_DEFINED
+#endif
+
+#ifndef DYNAMIC_TAG_MARKER
+#define DYNAMIC_TAG_MARKER(name, value) DYNAMIC_TAG(name, value)
+#define DYNAMIC_TAG_MARKER_DEFINED
+#endif
+
+DYNAMIC_TAG(NULL, 0)        // Marks end of dynamic array.
+DYNAMIC_TAG(NEEDED, 1)      // String table offset of needed library.
+DYNAMIC_TAG(PLTRELSZ, 2)    // Size of relocation entries in PLT.
+DYNAMIC_TAG(PLTGOT, 3)      // Address associated with linkage table.
+DYNAMIC_TAG(HASH, 4)        // Address of symbolic hash table.
+DYNAMIC_TAG(STRTAB, 5)      // Address of dynamic string table.
+DYNAMIC_TAG(SYMTAB, 6)      // Address of dynamic symbol table.
+DYNAMIC_TAG(RELA, 7)        // Address of relocation table (Rela entries).
+DYNAMIC_TAG(RELASZ, 8)      // Size of Rela relocation table.
+DYNAMIC_TAG(RELAENT, 9)     // Size of a Rela relocation entry.
+DYNAMIC_TAG(STRSZ, 10)      // Total size of the string table.
+DYNAMIC_TAG(SYMENT, 11)     // Size of a symbol table entry.
+DYNAMIC_TAG(INIT, 12)       // Address of initialization function.
+DYNAMIC_TAG(FINI, 13)       // Address of termination function.
+DYNAMIC_TAG(SONAME, 14)     // String table offset of a shared objects name.
+DYNAMIC_TAG(RPATH, 15)      // String table offset of library search path.
+DYNAMIC_TAG(SYMBOLIC, 16)   // Changes symbol resolution algorithm.
+DYNAMIC_TAG(REL, 17)        // Address of relocation table (Rel entries).
+DYNAMIC_TAG(RELSZ, 18)      // Size of Rel relocation table.
+DYNAMIC_TAG(RELENT, 19)     // Size of a Rel relocation entry.
+DYNAMIC_TAG(PLTREL, 20)     // Type of relocation entry used for linking.
+DYNAMIC_TAG(DEBUG, 21)      // Reserved for debugger.
+DYNAMIC_TAG(TEXTREL, 22)    // Relocations exist for non-writable segments.
+DYNAMIC_TAG(JMPREL, 23)     // Address of relocations associated with PLT.
+DYNAMIC_TAG(BIND_NOW, 24)   // Process all relocations before execution.
+DYNAMIC_TAG(INIT_ARRAY, 25) // Pointer to array of initialization functions.
+DYNAMIC_TAG(FINI_ARRAY, 26) // Pointer to array of termination functions.
+DYNAMIC_TAG(INIT_ARRAYSZ, 27) // Size of DT_INIT_ARRAY.
+DYNAMIC_TAG(FINI_ARRAYSZ, 28) // Size of DT_FINI_ARRAY.
+DYNAMIC_TAG(RUNPATH, 29)      // String table offset of lib search path.
+DYNAMIC_TAG(FLAGS, 30)        // Flags.
+DYNAMIC_TAG_MARKER(ENCODING, 32) // Values from here to DT_LOOS follow the rules
+                                 // for the interpretation of the d_un union.
+
+DYNAMIC_TAG(PREINIT_ARRAY, 32)   // Pointer to array of preinit functions.
+DYNAMIC_TAG(PREINIT_ARRAYSZ, 33) // Size of the DT_PREINIT_ARRAY array.
+
+DYNAMIC_TAG_MARKER(LOOS, 0x60000000)   // Start of environment specific tags.
+DYNAMIC_TAG_MARKER(HIOS, 0x6FFFFFFF)   // End of environment specific tags.
+DYNAMIC_TAG_MARKER(LOPROC, 0x70000000) // Start of processor specific tags.
+DYNAMIC_TAG_MARKER(HIPROC, 0x7FFFFFFF) // End of processor specific tags.
+
+// Android packed relocation section tags.
+// https://android.googlesource.com/platform/bionic/+/6f12bfece5dcc01325e0abba56a46b1bcf991c69/tools/relocation_packer/src/elf_file.cc#31
+DYNAMIC_TAG(ANDROID_REL, 0x6000000F)
+DYNAMIC_TAG(ANDROID_RELSZ, 0x60000010)
+DYNAMIC_TAG(ANDROID_RELA, 0x60000011)
+DYNAMIC_TAG(ANDROID_RELASZ, 0x60000012)
+
+DYNAMIC_TAG(GNU_HASH, 0x6FFFFEF5)    // Reference to the GNU hash table.
+DYNAMIC_TAG(TLSDESC_PLT, 0x6FFFFEF6) // Location of PLT entry for TLS
+                                     // descriptor resolver calls.
+DYNAMIC_TAG(TLSDESC_GOT, 0x6FFFFEF7) // Location of GOT entry used by TLS
+                                     // descriptor resolver PLT entry.
+DYNAMIC_TAG(RELACOUNT, 0x6FFFFFF9)   // ELF32_Rela count.
+DYNAMIC_TAG(RELCOUNT, 0x6FFFFFFA)    // ELF32_Rel count.
+
+DYNAMIC_TAG(FLAGS_1, 0X6FFFFFFB) // Flags_1.
+
+DYNAMIC_TAG(VERSYM, 0x6FFFFFF0)     // The address of .gnu.version section.
+DYNAMIC_TAG(VERDEF, 0X6FFFFFFC)     // The address of the version definition
+                                    // table.
+DYNAMIC_TAG(VERDEFNUM, 0X6FFFFFFD)  // The number of entries in DT_VERDEF.
+DYNAMIC_TAG(VERNEED, 0X6FFFFFFE)    // The address of the version dependency
+                                    // table.
+DYNAMIC_TAG(VERNEEDNUM, 0X6FFFFFFF) // The number of entries in DT_VERNEED.
+
+// Hexagon specific dynamic table entries
+HEXAGON_DYNAMIC_TAG(HEXAGON_SYMSZ, 0x70000000)
+HEXAGON_DYNAMIC_TAG(HEXAGON_VER, 0x70000001)
+HEXAGON_DYNAMIC_TAG(HEXAGON_PLT, 0x70000002)
+
+// Mips specific dynamic table entry tags.
+
+MIPS_DYNAMIC_TAG(MIPS_RLD_VERSION, 0x70000001)  // 32 bit version number for
+                                                // runtime linker interface.
+MIPS_DYNAMIC_TAG(MIPS_TIME_STAMP, 0x70000002)   // Time stamp.
+MIPS_DYNAMIC_TAG(MIPS_ICHECKSUM, 0x70000003)    // Checksum of external strings
+                                                // and common sizes.
+MIPS_DYNAMIC_TAG(MIPS_IVERSION, 0x70000004)     // Index of version string
+                                                // in string table.
+MIPS_DYNAMIC_TAG(MIPS_FLAGS, 0x70000005)        // 32 bits of flags.
+MIPS_DYNAMIC_TAG(MIPS_BASE_ADDRESS, 0x70000006) // Base address of the segment.
+MIPS_DYNAMIC_TAG(MIPS_MSYM, 0x70000007)         // Address of .msym section.
+MIPS_DYNAMIC_TAG(MIPS_CONFLICT, 0x70000008)     // Address of .conflict section.
+MIPS_DYNAMIC_TAG(MIPS_LIBLIST, 0x70000009)      // Address of .liblist section.
+MIPS_DYNAMIC_TAG(MIPS_LOCAL_GOTNO, 0x7000000a)  // Number of local global offset
+                                                // table entries.
+MIPS_DYNAMIC_TAG(MIPS_CONFLICTNO, 0x7000000b)   // Number of entries
+                                                // in the .conflict section.
+MIPS_DYNAMIC_TAG(MIPS_LIBLISTNO, 0x70000010)    // Number of entries
+                                                // in the .liblist section.
+MIPS_DYNAMIC_TAG(MIPS_SYMTABNO, 0x70000011)     // Number of entries
+                                                // in the .dynsym section.
+MIPS_DYNAMIC_TAG(MIPS_UNREFEXTNO, 0x70000012)   // Index of first external dynamic
+                                                // symbol not referenced locally.
+MIPS_DYNAMIC_TAG(MIPS_GOTSYM, 0x70000013)       // Index of first dynamic symbol
+                                                // in global offset table.
+MIPS_DYNAMIC_TAG(MIPS_HIPAGENO, 0x70000014)     // Number of page table entries
+                                                // in global offset table.
+MIPS_DYNAMIC_TAG(MIPS_RLD_MAP, 0x70000016)      // Address of run time loader map
+                                                // used for debugging.
+MIPS_DYNAMIC_TAG(MIPS_DELTA_CLASS, 0x70000017)    // Delta C++ class definition.
+MIPS_DYNAMIC_TAG(MIPS_DELTA_CLASS_NO, 0x70000018) // Number of entries
+                                                  // in DT_MIPS_DELTA_CLASS.
+MIPS_DYNAMIC_TAG(MIPS_DELTA_INSTANCE, 0x70000019) // Delta C++ class instances.
+MIPS_DYNAMIC_TAG(MIPS_DELTA_INSTANCE_NO, 0x7000001A) // Number of entries
+                                                     // in DT_MIPS_DELTA_INSTANCE.
+MIPS_DYNAMIC_TAG(MIPS_DELTA_RELOC, 0x7000001B)       // Delta relocations.
+MIPS_DYNAMIC_TAG(MIPS_DELTA_RELOC_NO, 0x7000001C)    // Number of entries
+                                                     // in DT_MIPS_DELTA_RELOC.
+MIPS_DYNAMIC_TAG(MIPS_DELTA_SYM, 0x7000001D)         // Delta symbols that Delta
+                                                     // relocations refer to.
+MIPS_DYNAMIC_TAG(MIPS_DELTA_SYM_NO, 0x7000001E)      // Number of entries
+                                                     // in DT_MIPS_DELTA_SYM.
+MIPS_DYNAMIC_TAG(MIPS_DELTA_CLASSSYM, 0x70000020)    // Delta symbols that hold
+                                                     // class declarations.
+MIPS_DYNAMIC_TAG(MIPS_DELTA_CLASSSYM_NO, 0x70000021) // Number of entries
+                                                     // in DT_MIPS_DELTA_CLASSSYM.
+
+MIPS_DYNAMIC_TAG(MIPS_CXX_FLAGS, 0x70000022)         // Flags indicating information
+                                                     // about C++ flavor.
+MIPS_DYNAMIC_TAG(MIPS_PIXIE_INIT, 0x70000023)        // Pixie information.
+MIPS_DYNAMIC_TAG(MIPS_SYMBOL_LIB, 0x70000024)        // Address of .MIPS.symlib
+MIPS_DYNAMIC_TAG(MIPS_LOCALPAGE_GOTIDX, 0x70000025)  // The GOT index of the first PTE
+                                                     // for a segment
+MIPS_DYNAMIC_TAG(MIPS_LOCAL_GOTIDX, 0x70000026)      // The GOT index of the first PTE
+                                                     // for a local symbol
+MIPS_DYNAMIC_TAG(MIPS_HIDDEN_GOTIDX, 0x70000027)     // The GOT index of the first PTE
+                                                     // for a hidden symbol
+MIPS_DYNAMIC_TAG(MIPS_PROTECTED_GOTIDX, 0x70000028)  // The GOT index of the first PTE
+                                                        // for a protected symbol
+MIPS_DYNAMIC_TAG(MIPS_OPTIONS, 0x70000029)               // Address of `.MIPS.options'.
+MIPS_DYNAMIC_TAG(MIPS_INTERFACE, 0x7000002A)             // Address of `.interface'.
+MIPS_DYNAMIC_TAG(MIPS_DYNSTR_ALIGN, 0x7000002B)          // Unknown.
+MIPS_DYNAMIC_TAG(MIPS_INTERFACE_SIZE, 0x7000002C)        // Size of the .interface section.
+MIPS_DYNAMIC_TAG(MIPS_RLD_TEXT_RESOLVE_ADDR, 0x7000002D) // Size of rld_text_resolve
+                                                         // function stored in the GOT.
+MIPS_DYNAMIC_TAG(MIPS_PERF_SUFFIX, 0x7000002E)  // Default suffix of DSO to be added
+                                                // by rld on dlopen() calls.
+MIPS_DYNAMIC_TAG(MIPS_COMPACT_SIZE, 0x7000002F) // Size of compact relocation
+                                                // section (O32).
+MIPS_DYNAMIC_TAG(MIPS_GP_VALUE, 0x70000030)     // GP value for auxiliary GOTs.
+MIPS_DYNAMIC_TAG(MIPS_AUX_DYNAMIC, 0x70000031)  // Address of auxiliary .dynamic.
+MIPS_DYNAMIC_TAG(MIPS_PLTGOT, 0x70000032)       // Address of the base of the PLTGOT.
+MIPS_DYNAMIC_TAG(MIPS_RWPLT, 0x70000034)        // Points to the base
+                                                // of a writable PLT.
+MIPS_DYNAMIC_TAG(MIPS_RLD_MAP_REL, 0x70000035)  // Relative offset of run time loader
+                                                // map, used for debugging.
+
+// Sun machine-independent extensions.
+DYNAMIC_TAG(AUXILIARY, 0x7FFFFFFD) // Shared object to load before self
+DYNAMIC_TAG(FILTER, 0x7FFFFFFF)    // Shared object to get values from
+
+
+#ifdef DYNAMIC_TAG_MARKER_DEFINED
+#undef DYNAMIC_TAG_MARKER
+#endif
+#ifdef MIPS_DYNAMIC_TAG_DEFINED
+#undef MIPS_DYNAMIC_TAG
+#endif
+#ifdef HEXAGON_DYNAMIC_TAG_DEFINED
+#undef HEXAGON_DYNAMIC_TAG
+#endif

include/llvm/BinaryFormat/ELF.h

struct Elf64_Dyn {
   union {
     Elf64_Xword d_val; // Integer value of entry.
     Elf64_Addr d_ptr;  // Pointer value of entry.
   } d_un;
 };
 
 // Dynamic table entry tags.
 enum {
-  DT_NULL = 0,          // Marks end of dynamic array.
-  DT_NEEDED = 1,        // String table offset of needed library.
-  DT_PLTRELSZ = 2,      // Size of relocation entries in PLT.
-  DT_PLTGOT = 3,        // Address associated with linkage table.
-  DT_HASH = 4,          // Address of symbolic hash table.
-  DT_STRTAB = 5,        // Address of dynamic string table.
-  DT_SYMTAB = 6,        // Address of dynamic symbol table.
-  DT_RELA = 7,          // Address of relocation table (Rela entries).
-  DT_RELASZ = 8,        // Size of Rela relocation table.
-  DT_RELAENT = 9,       // Size of a Rela relocation entry.
-  DT_STRSZ = 10,        // Total size of the string table.
-  DT_SYMENT = 11,       // Size of a symbol table entry.
-  DT_INIT = 12,         // Address of initialization function.
-  DT_FINI = 13,         // Address of termination function.
-  DT_SONAME = 14,       // String table offset of a shared objects name.
-  DT_RPATH = 15,        // String table offset of library search path.
-  DT_SYMBOLIC = 16,     // Changes symbol resolution algorithm.
-  DT_REL = 17,          // Address of relocation table (Rel entries).
-  DT_RELSZ = 18,        // Size of Rel relocation table.
-  DT_RELENT = 19,       // Size of a Rel relocation entry.
-  DT_PLTREL = 20,       // Type of relocation entry used for linking.
-  DT_DEBUG = 21,        // Reserved for debugger.
-  DT_TEXTREL = 22,      // Relocations exist for non-writable segments.
-  DT_JMPREL = 23,       // Address of relocations associated with PLT.
-  DT_BIND_NOW = 24,     // Process all relocations before execution.
-  DT_INIT_ARRAY = 25,   // Pointer to array of initialization functions.
-  DT_FINI_ARRAY = 26,   // Pointer to array of termination functions.
-  DT_INIT_ARRAYSZ = 27, // Size of DT_INIT_ARRAY.
-  DT_FINI_ARRAYSZ = 28, // Size of DT_FINI_ARRAY.
-  DT_RUNPATH = 29,      // String table offset of lib search path.
-  DT_FLAGS = 30,        // Flags.
-  DT_ENCODING = 32,     // Values from here to DT_LOOS follow the rules
-                        // for the interpretation of the d_un union.
-
-  DT_PREINIT_ARRAY = 32,   // Pointer to array of preinit functions.
-  DT_PREINIT_ARRAYSZ = 33, // Size of the DT_PREINIT_ARRAY array.
-
-  DT_LOOS = 0x60000000,   // Start of environment specific tags.
-  DT_HIOS = 0x6FFFFFFF,   // End of environment specific tags.
-  DT_LOPROC = 0x70000000, // Start of processor specific tags.
-  DT_HIPROC = 0x7FFFFFFF, // End of processor specific tags.
-
-  // Android packed relocation section tags.
-  // https://android.googlesource.com/platform/bionic/+/6f12bfece5dcc01325e0abba56a46b1bcf991c69/tools/relocation_packer/src/elf_file.cc#31
-  DT_ANDROID_REL = 0x6000000F,
-  DT_ANDROID_RELSZ = 0x60000010,
-  DT_ANDROID_RELA = 0x60000011,
-  DT_ANDROID_RELASZ = 0x60000012,
-
-  DT_GNU_HASH = 0x6FFFFEF5, // Reference to the GNU hash table.
-  DT_TLSDESC_PLT =
-      0x6FFFFEF6, // Location of PLT entry for TLS descriptor resolver calls.
-  DT_TLSDESC_GOT = 0x6FFFFEF7, // Location of GOT entry used by TLS descriptor
-                               // resolver PLT entry.
-  DT_RELACOUNT = 0x6FFFFFF9,   // ELF32_Rela count.
-  DT_RELCOUNT = 0x6FFFFFFA,    // ELF32_Rel count.
-
-  DT_FLAGS_1 = 0X6FFFFFFB,    // Flags_1.
-  DT_VERSYM = 0x6FFFFFF0,     // The address of .gnu.version section.
-  DT_VERDEF = 0X6FFFFFFC,     // The address of the version definition table.
-  DT_VERDEFNUM = 0X6FFFFFFD,  // The number of entries in DT_VERDEF.
-  DT_VERNEED = 0X6FFFFFFE,    // The address of the version Dependency table.
-  DT_VERNEEDNUM = 0X6FFFFFFF, // The number of entries in DT_VERNEED.
-
-  // Hexagon specific dynamic table entries
-  DT_HEXAGON_SYMSZ = 0x70000000,
-  DT_HEXAGON_VER = 0x70000001,
-  DT_HEXAGON_PLT = 0x70000002,
-
-  // Mips specific dynamic table entry tags.
-  DT_MIPS_RLD_VERSION = 0x70000001,    // 32 bit version number for runtime
-                                       // linker interface.
-  DT_MIPS_TIME_STAMP = 0x70000002,     // Time stamp.
-  DT_MIPS_ICHECKSUM = 0x70000003,      // Checksum of external strings
-                                       // and common sizes.
-  DT_MIPS_IVERSION = 0x70000004,       // Index of version string
-                                       // in string table.
-  DT_MIPS_FLAGS = 0x70000005,          // 32 bits of flags.
-  DT_MIPS_BASE_ADDRESS = 0x70000006,   // Base address of the segment.
-  DT_MIPS_MSYM = 0x70000007,           // Address of .msym section.
-  DT_MIPS_CONFLICT = 0x70000008,       // Address of .conflict section.
-  DT_MIPS_LIBLIST = 0x70000009,        // Address of .liblist section.
-  DT_MIPS_LOCAL_GOTNO = 0x7000000a,    // Number of local global offset
-                                       // table entries.
-  DT_MIPS_CONFLICTNO = 0x7000000b,     // Number of entries
-                                       // in the .conflict section.
-  DT_MIPS_LIBLISTNO = 0x70000010,      // Number of entries
-                                       // in the .liblist section.
-  DT_MIPS_SYMTABNO = 0x70000011,       // Number of entries
-                                       // in the .dynsym section.
-  DT_MIPS_UNREFEXTNO = 0x70000012,     // Index of first external dynamic symbol
-                                       // not referenced locally.
-  DT_MIPS_GOTSYM = 0x70000013,         // Index of first dynamic symbol
-                                       // in global offset table.
-  DT_MIPS_HIPAGENO = 0x70000014,       // Number of page table entries
-                                       // in global offset table.
-  DT_MIPS_RLD_MAP = 0x70000016,        // Address of run time loader map,
-                                       // used for debugging.
-  DT_MIPS_DELTA_CLASS = 0x70000017,    // Delta C++ class definition.
-  DT_MIPS_DELTA_CLASS_NO = 0x70000018, // Number of entries
-                                       // in DT_MIPS_DELTA_CLASS.
-  DT_MIPS_DELTA_INSTANCE = 0x70000019, // Delta C++ class instances.
-  DT_MIPS_DELTA_INSTANCE_NO = 0x7000001A,     // Number of entries
-                                              // in DT_MIPS_DELTA_INSTANCE.
-  DT_MIPS_DELTA_RELOC = 0x7000001B,           // Delta relocations.
-  DT_MIPS_DELTA_RELOC_NO = 0x7000001C,        // Number of entries
-                                              // in DT_MIPS_DELTA_RELOC.
-  DT_MIPS_DELTA_SYM = 0x7000001D,             // Delta symbols that Delta
-                                              // relocations refer to.
-  DT_MIPS_DELTA_SYM_NO = 0x7000001E,          // Number of entries
-                                              // in DT_MIPS_DELTA_SYM.
-  DT_MIPS_DELTA_CLASSSYM = 0x70000020,        // Delta symbols that hold
-                                              // class declarations.
-  DT_MIPS_DELTA_CLASSSYM_NO = 0x70000021,     // Number of entries
-                                              // in DT_MIPS_DELTA_CLASSSYM.
-  DT_MIPS_CXX_FLAGS = 0x70000022,             // Flags indicating information
-                                              // about C++ flavor.
-  DT_MIPS_PIXIE_INIT = 0x70000023,            // Pixie information.
-  DT_MIPS_SYMBOL_LIB = 0x70000024,            // Address of .MIPS.symlib
-  DT_MIPS_LOCALPAGE_GOTIDX = 0x70000025,      // The GOT index of the first PTE
-                                              // for a segment
-  DT_MIPS_LOCAL_GOTIDX = 0x70000026,          // The GOT index of the first PTE
-                                              // for a local symbol
-  DT_MIPS_HIDDEN_GOTIDX = 0x70000027,         // The GOT index of the first PTE
-                                              // for a hidden symbol
-  DT_MIPS_PROTECTED_GOTIDX = 0x70000028,      // The GOT index of the first PTE
-                                              // for a protected symbol
-  DT_MIPS_OPTIONS = 0x70000029,               // Address of `.MIPS.options'.
-  DT_MIPS_INTERFACE = 0x7000002A,             // Address of `.interface'.
-  DT_MIPS_DYNSTR_ALIGN = 0x7000002B,          // Unknown.
-  DT_MIPS_INTERFACE_SIZE = 0x7000002C,        // Size of the .interface section.
-  DT_MIPS_RLD_TEXT_RESOLVE_ADDR = 0x7000002D, // Size of rld_text_resolve
-                                              // function stored in the GOT.
-  DT_MIPS_PERF_SUFFIX = 0x7000002E,  // Default suffix of DSO to be added
-                                     // by rld on dlopen() calls.
-  DT_MIPS_COMPACT_SIZE = 0x7000002F, // Size of compact relocation
-                                     // section (O32).
-  DT_MIPS_GP_VALUE = 0x70000030,     // GP value for auxiliary GOTs.
-  DT_MIPS_AUX_DYNAMIC = 0x70000031,  // Address of auxiliary .dynamic.
-  DT_MIPS_PLTGOT = 0x70000032,       // Address of the base of the PLTGOT.
-  DT_MIPS_RWPLT = 0x70000034,        // Points to the base
-                                     // of a writable PLT.
-  DT_MIPS_RLD_MAP_REL = 0x70000035,  // Relative offset of run time loader
-                                     // map, used for debugging.
-
-  // Sun machine-independent extensions.
-  DT_AUXILIARY = 0x7FFFFFFD, // Shared object to load before self
-  DT_FILTER = 0x7FFFFFFF     // Shared object to get values from
+#define DYNAMIC_TAG(name, value) DT_##name = value,
+#include "DynamicTags.def"
+#undef DYNAMIC_TAG
 };
 
 // DT_FLAGS values.
 enum {
   DF_ORIGIN = 0x01,    // The object may reference $ORIGIN.
   DF_SYMBOLIC = 0x02,  // Search the shared lib before searching the exe.
   DF_TEXTREL = 0x04,   // Relocations may modify a non-writable segment.
   DF_BIND_NOW = 0x08,  // Process all relocations on load.

include/llvm/module.modulemap

 }
 
 module LLVM_Bitcode { requires cplusplus umbrella "Bitcode" module * { export * } }
 
 module LLVM_BinaryFormat {
     requires cplusplus
     umbrella "BinaryFormat" module * { export * }
     textual header "BinaryFormat/Dwarf.def"
+    textual header "BinaryFormat/DynamicTags.def"
     textual header "BinaryFormat/MachO.def"
     textual header "BinaryFormat/ELFRelocs/AArch64.def"
     textual header "BinaryFormat/ELFRelocs/AMDGPU.def"
     textual header "BinaryFormat/ELFRelocs/ARM.def"
     textual header "BinaryFormat/ELFRelocs/ARC.def"
     textual header "BinaryFormat/ELFRelocs/AVR.def"
     textual header "BinaryFormat/ELFRelocs/BPF.def"
     textual header "BinaryFormat/ELFRelocs/Hexagon.def"

tools/llvm-readobj/ELFDumper.cpp

 template <class ELFT> void ELFDumper<ELFT>::printNotes() {
   ELFDumperStyle->printNotes(Obj);
 }
 
 template <class ELFT> void ELFDumper<ELFT>::printELFLinkerOptions() {
   ELFDumperStyle->printELFLinkerOptions(Obj);
 }
 
-#define LLVM_READOBJ_TYPE_CASE(name) \
-  case DT_##name: return #name
-
 static const char *getTypeString(unsigned Arch, uint64_t Type) {
+#define DYNAMIC_TAG(n, v)
   switch (Arch) {
   case EM_HEXAGON:
     switch (Type) {
-    LLVM_READOBJ_TYPE_CASE(HEXAGON_SYMSZ);
-    LLVM_READOBJ_TYPE_CASE(HEXAGON_VER);
-    LLVM_READOBJ_TYPE_CASE(HEXAGON_PLT);
+#define HEXAGON_DYNAMIC_TAG(name, value)                                       \
+  case DT_##name:                                                              \
+    return #name;
+#include "llvm/BinaryFormat/DynamicTags.def"
+#undef HEXAGON_DYNAMIC_TAG
     }
   case EM_MIPS:
     switch (Type) {
-    LLVM_READOBJ_TYPE_CASE(MIPS_RLD_MAP_REL);
-    LLVM_READOBJ_TYPE_CASE(MIPS_RLD_VERSION);
-    LLVM_READOBJ_TYPE_CASE(MIPS_FLAGS);
-    LLVM_READOBJ_TYPE_CASE(MIPS_BASE_ADDRESS);
-    LLVM_READOBJ_TYPE_CASE(MIPS_LOCAL_GOTNO);
-    LLVM_READOBJ_TYPE_CASE(MIPS_SYMTABNO);
-    LLVM_READOBJ_TYPE_CASE(MIPS_UNREFEXTNO);
-    LLVM_READOBJ_TYPE_CASE(MIPS_GOTSYM);
-    LLVM_READOBJ_TYPE_CASE(MIPS_RLD_MAP);
-    LLVM_READOBJ_TYPE_CASE(MIPS_PLTGOT);
-    LLVM_READOBJ_TYPE_CASE(MIPS_OPTIONS);
+#define MIPS_DYNAMIC_TAG(name, value)                                          \
+  case DT_##name:                                                              \
+    return #name;
+#include "llvm/BinaryFormat/DynamicTags.def"
+#undef MIPS_DYNAMIC_TAG
     }
   }
   switch (Type) {
-  LLVM_READOBJ_TYPE_CASE(ANDROID_REL);
-  LLVM_READOBJ_TYPE_CASE(ANDROID_RELSZ);
-  LLVM_READOBJ_TYPE_CASE(ANDROID_RELA);
-  LLVM_READOBJ_TYPE_CASE(ANDROID_RELASZ);
-  LLVM_READOBJ_TYPE_CASE(BIND_NOW);
-  LLVM_READOBJ_TYPE_CASE(DEBUG);
-  LLVM_READOBJ_TYPE_CASE(FINI);
-  LLVM_READOBJ_TYPE_CASE(FINI_ARRAY);
-  LLVM_READOBJ_TYPE_CASE(FINI_ARRAYSZ);
-  LLVM_READOBJ_TYPE_CASE(FLAGS);
-  LLVM_READOBJ_TYPE_CASE(FLAGS_1);
-  LLVM_READOBJ_TYPE_CASE(HASH);
-  LLVM_READOBJ_TYPE_CASE(INIT);
-  LLVM_READOBJ_TYPE_CASE(INIT_ARRAY);
-  LLVM_READOBJ_TYPE_CASE(INIT_ARRAYSZ);
-  LLVM_READOBJ_TYPE_CASE(PREINIT_ARRAY);
-  LLVM_READOBJ_TYPE_CASE(PREINIT_ARRAYSZ);
-  LLVM_READOBJ_TYPE_CASE(JMPREL);
-  LLVM_READOBJ_TYPE_CASE(NEEDED);
-  LLVM_READOBJ_TYPE_CASE(NULL);
-  LLVM_READOBJ_TYPE_CASE(PLTGOT);
-  LLVM_READOBJ_TYPE_CASE(PLTREL);
-  LLVM_READOBJ_TYPE_CASE(PLTRELSZ);
-  LLVM_READOBJ_TYPE_CASE(REL);
-  LLVM_READOBJ_TYPE_CASE(RELA);
-  LLVM_READOBJ_TYPE_CASE(RELENT);
-  LLVM_READOBJ_TYPE_CASE(RELSZ);
-  LLVM_READOBJ_TYPE_CASE(RELAENT);
-  LLVM_READOBJ_TYPE_CASE(RELASZ);
-  LLVM_READOBJ_TYPE_CASE(RPATH);
-  LLVM_READOBJ_TYPE_CASE(RUNPATH);
-  LLVM_READOBJ_TYPE_CASE(SONAME);
-  LLVM_READOBJ_TYPE_CASE(STRSZ);
-  LLVM_READOBJ_TYPE_CASE(STRTAB);
-  LLVM_READOBJ_TYPE_CASE(SYMBOLIC);
-  LLVM_READOBJ_TYPE_CASE(SYMENT);
-  LLVM_READOBJ_TYPE_CASE(SYMTAB);
-  LLVM_READOBJ_TYPE_CASE(TEXTREL);
-  LLVM_READOBJ_TYPE_CASE(VERDEF);
-  LLVM_READOBJ_TYPE_CASE(VERDEFNUM);
-  LLVM_READOBJ_TYPE_CASE(VERNEED);
-  LLVM_READOBJ_TYPE_CASE(VERNEEDNUM);
-  LLVM_READOBJ_TYPE_CASE(VERSYM);
-  LLVM_READOBJ_TYPE_CASE(RELACOUNT);
-  LLVM_READOBJ_TYPE_CASE(RELCOUNT);
-  LLVM_READOBJ_TYPE_CASE(GNU_HASH);
-  LLVM_READOBJ_TYPE_CASE(TLSDESC_PLT);
-  LLVM_READOBJ_TYPE_CASE(TLSDESC_GOT);
-  LLVM_READOBJ_TYPE_CASE(AUXILIARY);
-  LLVM_READOBJ_TYPE_CASE(FILTER);
+// Now handle all dynamic tags except the architecture specific ones
+#define MIPS_DYNAMIC_TAG(name, value)
+#define HEXAGON_DYNAMIC_TAG(name, value)
+// Also ignore marker tags such as DT_HIOS (maps to DT_VERNEEDNUM), etc.
+#define DYNAMIC_TAG_MARKER(name, value)
+#undef DYNAMIC_TAG
+#define DYNAMIC_TAG(name, value)                                               \
+  case DT_##name:                                                              \
+    return #name;
+#include "llvm/BinaryFormat/DynamicTags.def"
+#undef DYNAMIC_TAG
+#undef MIPS_DYNAMIC_TAG
+#undef HEXAGON_DYNAMIC_TAG
+#undef DYNAMIC_TAG_MARKER
   default: return "unknown";
   }
 }
 
 #undef LLVM_READOBJ_TYPE_CASE
 
 #define LLVM_READOBJ_DT_FLAG_ENT(prefix, enum) \
   { #enum, prefix##_##enum }
 
 static const EnumEntry<unsigned> ElfDynamicDTFlags[] = {
   LLVM_READOBJ_DT_FLAG_ENT(DF, ORIGIN),
   LLVM_READOBJ_DT_FLAG_ENT(DF, SYMBOLIC),
   LLVM_READOBJ_DT_FLAG_ENT(DF, TEXTREL),