[obj2yaml] - Dump the sh_entsize section field.

[grimar]

Summary

I faced with the fact that obj2yaml does not dump the sh_entsize field.
A problem arose when I tried to dump ELF versioning sections.

This is close to what D50235 did, but D50235 did the change for yaml2obj, and now
I had to do the same for obj2yaml.

[jhenderson]

test/tools/obj2yaml/elf-ent-size.yaml

1

Nit: rename the test elf-entsize.yaml, since entsize is all one "word" in the field name.

12

You can simplify this somewhat by a) getting rid of the .text section, b) getting rid of the symbol, and c) removing the content and AddressAlign fields from the .rodata.cst4 section.

tools/obj2yaml/elf2yaml.cpp

321

Why are we casting this, but none of the other fields?

[grimar]

test/tools/obj2yaml/elf-ent-size.yaml

1

OK. FWIW naming was based on a similar test from yaml2obj folder (llvm\test\tools\yam2obj\elf-ent-size.yaml) (Oh, and it was me who committed it initially..). Thanks :)

tools/obj2yaml/elf2yaml.cpp

321

EntSize is the only Optional<llvm::yaml::Hex64> here. Without the cast I have an error:

1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(321): error C2679: binary '=': no operator found which takes a right-hand operand of type 'const llvm::support::detail::packed_endian_specific_integral<uint32_t,llvm::support::little,1>' (or there is no acceptable conversion)
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(150): note: could be 'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(const llvm::Optional<llvm::yaml::Hex64> &)'
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(146): note: or       'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(const T &)'
1>        with
1>        [
1>            T=llvm::yaml::Hex64
1>        ]
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(133): note: or       'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(llvm::Optional<llvm::yaml::Hex64> &&)'
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(129): note: or       'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(T &&)'
1>        with
1>        [
1>            T=llvm::yaml::Hex64
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(321): note: while trying to match the argument list '(llvm::Optional<llvm::yaml::Hex64>, const llvm::support::detail::packed_endian_specific_integral<uint32_t,llvm::support::little,1>)'
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(315): note: while compiling class template member function 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpCommonSection(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::Section &)'
1>        with
1>        [
1>            ELFT=llvm::object::ELF32LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(420): note: see reference to function template instantiation 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpCommonSection(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::Section &)' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF32LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(205): note: while compiling class template member function 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpSymbols(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::LocalGlobalWeakSymbols &)'
1>        with
1>        [
1>            ELFT=llvm::object::ELF32LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(194): note: see reference to function template instantiation 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpSymbols(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::LocalGlobalWeakSymbols &)' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF32LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(71): note: while compiling class template member function '`anonymous-namespace'::ELFDumper<ELFT>::ELFDumper(const llvm::object::ELFFile<ELFT> &)'
1>        with
1>        [
1>            ELFT=llvm::object::ELF32LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(523): note: see reference to function template instantiation '`anonymous-namespace'::ELFDumper<ELFT>::ELFDumper(const llvm::object::ELFFile<ELFT> &)' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF32LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(523): note: see reference to class template instantiation '`anonymous-namespace'::ELFDumper<ELFT>' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF32LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(537): note: see reference to function template instantiation 'std::error_code elf2yaml<llvm::object::ELF32LE>(llvm::raw_ostream &,const llvm::object::ELFFile<llvm::object::ELF32LE> &)' being compiled
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(321): error C2679: binary '=': no operator found which takes a right-hand operand of type 'const llvm::support::detail::packed_endian_specific_integral<uint32_t,llvm::support::big,1>' (or there is no acceptable conversion)
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(150): note: could be 'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(const llvm::Optional<llvm::yaml::Hex64> &)'
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(146): note: or       'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(const T &)'
1>        with
1>        [
1>            T=llvm::yaml::Hex64
1>        ]
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(133): note: or       'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(llvm::Optional<llvm::yaml::Hex64> &&)'
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(129): note: or       'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(T &&)'
1>        with
1>        [
1>            T=llvm::yaml::Hex64
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(321): note: while trying to match the argument list '(llvm::Optional<llvm::yaml::Hex64>, const llvm::support::detail::packed_endian_specific_integral<uint32_t,llvm::support::big,1>)'
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(315): note: while compiling class template member function 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpCommonSection(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::Section &)'
1>        with
1>        [
1>            ELFT=llvm::object::ELF32BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(420): note: see reference to function template instantiation 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpCommonSection(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::Section &)' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF32BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(205): note: while compiling class template member function 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpSymbols(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::LocalGlobalWeakSymbols &)'
1>        with
1>        [
1>            ELFT=llvm::object::ELF32BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(194): note: see reference to function template instantiation 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpSymbols(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::LocalGlobalWeakSymbols &)' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF32BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(71): note: while compiling class template member function '`anonymous-namespace'::ELFDumper<ELFT>::ELFDumper(const llvm::object::ELFFile<ELFT> &)'
1>        with
1>        [
1>            ELFT=llvm::object::ELF32BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(523): note: see reference to function template instantiation '`anonymous-namespace'::ELFDumper<ELFT>::ELFDumper(const llvm::object::ELFFile<ELFT> &)' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF32BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(523): note: see reference to class template instantiation '`anonymous-namespace'::ELFDumper<ELFT>' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF32BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(540): note: see reference to function template instantiation 'std::error_code elf2yaml<llvm::object::ELF32BE>(llvm::raw_ostream &,const llvm::object::ELFFile<llvm::object::ELF32BE> &)' being compiled
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(321): error C2679: binary '=': no operator found which takes a right-hand operand of type 'const llvm::support::detail::packed_endian_specific_integral<uint64_t,llvm::support::little,1>' (or there is no acceptable conversion)
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(150): note: could be 'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(const llvm::Optional<llvm::yaml::Hex64> &)'
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(146): note: or       'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(const T &)'
1>        with
1>        [
1>            T=llvm::yaml::Hex64
1>        ]
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(133): note: or       'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(llvm::Optional<llvm::yaml::Hex64> &&)'
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(129): note: or       'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(T &&)'
1>        with
1>        [
1>            T=llvm::yaml::Hex64
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(321): note: while trying to match the argument list '(llvm::Optional<llvm::yaml::Hex64>, const llvm::support::detail::packed_endian_specific_integral<uint64_t,llvm::support::little,1>)'
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(315): note: while compiling class template member function 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpCommonSection(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::Section &)'
1>        with
1>        [
1>            ELFT=llvm::object::ELF64LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(420): note: see reference to function template instantiation 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpCommonSection(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::Section &)' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF64LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(205): note: while compiling class template member function 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpSymbols(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::LocalGlobalWeakSymbols &)'
1>        with
1>        [
1>            ELFT=llvm::object::ELF64LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(194): note: see reference to function template instantiation 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpSymbols(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::LocalGlobalWeakSymbols &)' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF64LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(71): note: while compiling class template member function '`anonymous-namespace'::ELFDumper<ELFT>::ELFDumper(const llvm::object::ELFFile<ELFT> &)'
1>        with
1>        [
1>            ELFT=llvm::object::ELF64LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(523): note: see reference to function template instantiation '`anonymous-namespace'::ELFDumper<ELFT>::ELFDumper(const llvm::object::ELFFile<ELFT> &)' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF64LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(523): note: see reference to class template instantiation '`anonymous-namespace'::ELFDumper<ELFT>' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF64LE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(543): note: see reference to function template instantiation 'std::error_code elf2yaml<llvm::object::ELF64LE>(llvm::raw_ostream &,const llvm::object::ELFFile<llvm::object::ELF64LE> &)' being compiled
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(321): error C2679: binary '=': no operator found which takes a right-hand operand of type 'const llvm::support::detail::packed_endian_specific_integral<uint64_t,llvm::support::big,1>' (or there is no acceptable conversion)
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(150): note: could be 'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(const llvm::Optional<llvm::yaml::Hex64> &)'
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(146): note: or       'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(const T &)'
1>        with
1>        [
1>            T=llvm::yaml::Hex64
1>        ]
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(133): note: or       'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(llvm::Optional<llvm::yaml::Hex64> &&)'
1>D:\Work2\llvm\llvm\include\llvm/ADT/Optional.h(129): note: or       'llvm::Optional<llvm::yaml::Hex64> &llvm::Optional<llvm::yaml::Hex64>::operator =(T &&)'
1>        with
1>        [
1>            T=llvm::yaml::Hex64
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(321): note: while trying to match the argument list '(llvm::Optional<llvm::yaml::Hex64>, const llvm::support::detail::packed_endian_specific_integral<uint64_t,llvm::support::big,1>)'
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(315): note: while compiling class template member function 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpCommonSection(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::Section &)'
1>        with
1>        [
1>            ELFT=llvm::object::ELF64BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(420): note: see reference to function template instantiation 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpCommonSection(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::Section &)' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF64BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(205): note: while compiling class template member function 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpSymbols(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::LocalGlobalWeakSymbols &)'
1>        with
1>        [
1>            ELFT=llvm::object::ELF64BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(194): note: see reference to function template instantiation 'std::error_code `anonymous-namespace'::ELFDumper<ELFT>::dumpSymbols(const llvm::object::Elf_Shdr_Impl<ELFT> *,llvm::ELFYAML::LocalGlobalWeakSymbols &)' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF64BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(71): note: while compiling class template member function '`anonymous-namespace'::ELFDumper<ELFT>::ELFDumper(const llvm::object::ELFFile<ELFT> &)'
1>        with
1>        [
1>            ELFT=llvm::object::ELF64BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(523): note: see reference to function template instantiation '`anonymous-namespace'::ELFDumper<ELFT>::ELFDumper(const llvm::object::ELFFile<ELFT> &)' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF64BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(523): note: see reference to class template instantiation '`anonymous-namespace'::ELFDumper<ELFT>' being compiled
1>        with
1>        [
1>            ELFT=llvm::object::ELF64BE
1>        ]
1>D:\Work2\llvm\llvm\tools\obj2yaml\elf2yaml.cpp(546): note: see reference to function template instantiation 'std::error_code elf2yaml<llvm::object::ELF64BE>(llvm::raw_ostream &,const llvm::object::ELFFile<llvm::object::ELF64BE> &)' being compiled
1>Done building project "obj2yaml.vcxproj" -- FAILED.

[grimar]

• Addressed review comments.

[jhenderson]

LGTM.

tools/obj2yaml/elf2yaml.cpp

321

Okay. Use static_cast, I think, unless there's precedent for C-style casts in this project.

test/Object/AArch64/yaml2obj-elf-aarch64-rel.yaml

 # RUN: yaml2obj %s > %t
 # RUN: obj2yaml  %t | FileCheck %s
 
 # CHECK:      - Name:            .rela.text
 # CHECK-NEXT:   Type:            SHT_RELA
 # CHECK-NEXT:    Link:            .symtab
 # CHECK-NEXT:    AddressAlign:    0x0000000000000008
+# CHECK-NEXT:    EntSize:         0x0000000000000018
 # CHECK-NEXT:    Info:            .text
 # CHECK-NEXT:    Relocations:     
 # CHECK-NEXT:      - Offset:          0x0000000000000000
 # CHECK-NEXT:        Symbol:          main
 # CHECK-NEXT:        Type:            R_AARCH64_ABS64
 # CHECK-NEXT:      - Offset:          0x0000000000000008
 # CHECK-NEXT:        Symbol:          main
 # CHECK-NEXT:        Type:            R_AARCH64_TLSGD_ADR_PREL21

test/Object/Mips/abi-flags.yaml

 # OBJ-NEXT:   ]
 # OBJ-NEXT:   Flags 2: 0x0
 # OBJ-NEXT: }
 
 # YAML:      Sections:
 # YAML-NEXT: - Name:            .MIPS.abiflags
 # YAML-NEXT:   Type:            SHT_MIPS_ABIFLAGS
 # YAML-NEXT:   AddressAlign:    0x0000000000000008
+# YAML-NEXT:   EntSize:         0x0000000000000018
 # YAML-NEXT:   ISA:             MIPS64
 # YAML-NEXT:   ISARevision:     0x05
 # YAML-NEXT:   ISAExtension:    EXT_OCTEON3
 # YAML-NEXT:   ASEs:            [ DSP, DSPR2, VIRT ]
 # YAML-NEXT:   FpABI:           FP_DOUBLE
 # YAML-NEXT:   GPRSize:         REG_64
 # YAML-NEXT:   CPR1Size:        REG_64
 # YAML-NEXT:   Flags1:          [ ODDSPREG ]

test/Object/obj2yaml-invalid-reloc.test

 CHECK-NEXT:     Type:            SHT_PROGBITS
 CHECK-NEXT:     Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
 CHECK-NEXT:     AddressAlign:    0x0000000000000004
 CHECK-NEXT:     Content:         4833C0C390
 CHECK-NEXT:   - Name:            .rela.text
 CHECK-NEXT:     Type:            SHT_RELA
 CHECK-NEXT:     Link:            .symtab
 CHECK-NEXT:     AddressAlign:    0x0000000000000008
+CHECK-NEXT:     EntSize:         0x0000000000000018
 CHECK-NEXT:     Info:            .text
 CHECK-NEXT:     Relocations:
 CHECK-NEXT:       - Offset:          0x0000000000000000
 CHECK-NEXT:         Symbol:          ''
 CHECK-NEXT:         Type:            R_X86_64_NONE
 CHECK-NEXT: Symbols:
 CHECK-NEXT:   Local:
 CHECK-NEXT:     - Name:            rb_ary_new_capa

test/Object/obj2yaml.test

 ELF-MIPSEL-NEXT:     Type:            SHT_PROGBITS
 ELF-MIPSEL-NEXT:     Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
 ELF-MIPSEL-NEXT:     AddressAlign:    0x0000000000000004
 ELF-MIPSEL-NEXT:     Content:         0000023C00004224E8FFBD271400BFAF1000B0AF218059000000018E000024240000198E09F8200321E000020000198E09F8200321E00002000002241000B08F1400BF8F0800E0031800BD27
 ELF-MIPSEL-NEXT:   - Name:            .rel.text
 ELF-MIPSEL-NEXT:     Type:            SHT_REL
 ELF-MIPSEL-NEXT:     Link:            .symtab
 ELF-MIPSEL-NEXT:     AddressAlign:    0x0000000000000004
+ELF-MIPSEL-NEXT:     EntSize:         0x0000000000000008
 ELF-MIPSEL-NEXT:     Info:            .text
 ELF-MIPSEL-NEXT:     Relocations:
 ELF-MIPSEL-NEXT:       - Offset:          0x0000000000000000
 ELF-MIPSEL-NEXT:         Symbol:          _gp_disp
 ELF-MIPSEL-NEXT:         Type:            R_MIPS_HI16
 ELF-MIPSEL-NEXT:       - Offset:          0x0000000000000004
 ELF-MIPSEL-NEXT:         Symbol:          _gp_disp
 ELF-MIPSEL-NEXT:         Type:            R_MIPS_LO16

 ELF-MIPSEL-NEXT:   - Name:            .mdebug.abi32
 ELF-MIPSEL-NEXT:     Type:            SHT_PROGBITS
 ELF-MIPSEL-NEXT:     AddressAlign:    0x0000000000000001
 ELF-MIPSEL-NEXT:     Content:         ''
 ELF-MIPSEL-NEXT:   - Name:            .rodata.str1.1
 ELF-MIPSEL-NEXT:     Type:            SHT_PROGBITS
 ELF-MIPSEL-NEXT:     Flags:           [ SHF_ALLOC, SHF_MERGE, SHF_STRINGS ]
 ELF-MIPSEL-NEXT:     AddressAlign:    0x0000000000000001
+ELF-MIPSEL-NEXT:     EntSize:         0x0000000000000001
 ELF-MIPSEL-NEXT:     Content:         48656C6C6F20576F726C640A00
 ELF-MIPSEL-NEXT:   - Name:            .reginfo
 ELF-MIPSEL-NEXT:     Type:            SHT_MIPS_REGINFO
 ELF-MIPSEL-NEXT:     Flags:           [ SHF_ALLOC ]
 ELF-MIPSEL-NEXT:     AddressAlign:    0x0000000000000001
 ELF-MIPSEL-NEXT:     Content:         '000000000000000000000000000000000000000000000000'
 ELF-MIPSEL-NEXT:   - Name:            .MIPS.abiflags
 ELF-MIPSEL-NEXT:     Type:            SHT_MIPS_ABIFLAGS

 ELF-MIPS64EL-NEXT:     Type:            SHT_PROGBITS
 ELF-MIPS64EL-NEXT:     Flags:           [ SHF_WRITE, SHF_ALLOC ]
 ELF-MIPS64EL-NEXT:     AddressAlign:    0x0000000000000010
 ELF-MIPS64EL-NEXT:     Content:         '00000000000000000000000000000000'
 ELF-MIPS64EL-NEXT:   - Name:            .rela.data
 ELF-MIPS64EL-NEXT:     Type:            SHT_RELA
 ELF-MIPS64EL-NEXT:     Link:            .symtab
 ELF-MIPS64EL-NEXT:     AddressAlign:    0x0000000000000008
+ELF-MIPS64EL-NEXT:     EntSize:         0x0000000000000018
 ELF-MIPS64EL-NEXT:     Info:            .data
 ELF-MIPS64EL-NEXT:     Relocations:
 ELF-MIPS64EL-NEXT:       - Offset:          0
 ELF-MIPS64EL-NEXT:         Symbol:          zed
 ELF-MIPS64EL-NEXT:         Type:            R_MIPS_64
 ELF-MIPS64EL-NEXT:   - Name:            .bss
 ELF-MIPS64EL-NEXT:     Type:            SHT_NOBITS
 ELF-MIPS64EL-NEXT:     Flags:           [ SHF_WRITE, SHF_ALLOC ]
 ELF-MIPS64EL-NEXT:     AddressAlign:    0x0000000000000010
 ELF-MIPS64EL-NEXT:   - Name:            .MIPS.options
 ELF-MIPS64EL-NEXT:     Type:            SHT_MIPS_OPTIONS
 ELF-MIPS64EL-NEXT:     Flags:           [ SHF_ALLOC, SHF_MIPS_NOSTRIP ]
 ELF-MIPS64EL-NEXT:     AddressAlign:    0x0000000000000008
+ELF-MIPS64EL-NEXT:     EntSize:         0x0000000000000001
 ELF-MIPS64EL-NEXT:     Content:         '01280000000000000000000000000000000000000000000000000000000000000000000000000000'
 ELF-MIPS64EL-NEXT:   - Name:            .pdr
 ELF-MIPS64EL-NEXT:     Type:            SHT_PROGBITS
 ELF-MIPS64EL-NEXT:     AddressAlign:    0x0000000000000004
 ELF-MIPS64EL-NEXT:     Content:         ''
 ELF-MIPS64EL-NEXT: Symbols:
 ELF-MIPS64EL-NEXT:   Local:
 ELF-MIPS64EL-NEXT:     - Name:            .text

 ELF-X86-64-NEXT:     Address:         0x0000000000000033
 ELF-X86-64-NEXT:     AddressAlign:    0x0000000000000001
 ELF-X86-64-NEXT:     Content:         ''
 ELF-X86-64-NEXT:   - Name:            .rela.text
 ELF-X86-64-NEXT:     Type:            SHT_RELA
 ELF-X86-64-NEXT:     Address:         0x0000000000000038
 ELF-X86-64-NEXT:     Link:            .symtab
 ELF-X86-64-NEXT:     AddressAlign:    0x0000000000000008
+ELF-X86-64-NEXT:     EntSize:         0x0000000000000018
 ELF-X86-64-NEXT:     Info:            .text
 ELF-X86-64-NEXT:     Relocations:
 ELF-X86-64-NEXT:       - Offset:          0x000000000000000D
 ELF-X86-64-NEXT:         Symbol:          .rodata.str1.1
 ELF-X86-64-NEXT:         Type:            R_X86_64_32S
 ELF-X86-64-NEXT:       - Offset:          0x0000000000000012
 ELF-X86-64-NEXT:         Symbol:          puts
 ELF-X86-64-NEXT:         Type:            R_X86_64_PC32

test/tools/obj2yaml/elf-ent-size.yaml

+# RUN: yaml2obj %s -o %t
+# RUN: obj2yaml %t | FileCheck %s
+
+## Check obj2yaml is able to dump sh_entsize field of a section.
+
+# CHECK:      - Name:            .rodata.cst4
+# CHECK-NEXT:   Type:            SHT_PROGBITS
+# CHECK-NEXT:   Flags:           [ SHF_ALLOC, SHF_MERGE ]
+# CHECK-NEXT:   AddressAlign:    0x0000000000000001
+# CHECK-NEXT:   EntSize:         0x0000000000000004
+
+--- !ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_REL
+  Machine:         EM_X86_64
+Sections:
+  - Name:            .text
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    AddressAlign:    0x0000000000000004
+    Content:         ''
+  - Name:            .rodata.cst4
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_MERGE ]
+    AddressAlign:    0x0000000000000001
+    EntSize:         0x0000000000000004
+    Content:         '67452301103254766745230110325476'
+Symbols:
+  Local:
+    - Name:            rodata4
+      Section:         .rodata.cst4

tools/obj2yaml/elf2yaml.cpp

 
 template <class ELFT>
 std::error_code ELFDumper<ELFT>::dumpCommonSection(const Elf_Shdr *Shdr,
                                                    ELFYAML::Section &S) {
   S.Type = Shdr->sh_type;
   S.Flags = Shdr->sh_flags;
   S.Address = Shdr->sh_addr;
   S.AddressAlign = Shdr->sh_addralign;
+  if (Shdr->sh_entsize)
+    S.EntSize = (llvm::yaml::Hex64)Shdr->sh_entsize;
 
   auto NameOrErr = getUniquedSectionName(Shdr);
   if (!NameOrErr)
     return errorToErrorCode(NameOrErr.takeError());
   S.Name = NameOrErr.get();
 
   if (Shdr->sh_link != ELF::SHN_UNDEF) {
     auto LinkSection = Obj.getSection(Shdr->sh_link);