9e07346679
SHF_GROUP: Group Member Sections ---------------------------------- A section which is part of a group, and is to be retained or discarded with the group as a whole, is identified by a new section header attribute: SHF_GROUP This section is a member (perhaps the only one) of a group of sections, and the linker should retain or discard all or none of the members. This section must be referenced in a SHT_GROUP section. This attribute flag may be set in any section header, and no other modification or indication is made in the grouped sections. All additional information is contained in the associated SHT_GROUP section. SHT_GROUP: Section Group Definition ------------------------------------- Represents a group section. The section group's sh_link field identifies a symbol table section, and its sh_info field the index of a symbol in that section. The name of that symbol is treated as the identifier of the section group. More information: https://mentorembedded.github.io/cxx-abi/abi/prop-72-comdat.html Added a lot of extensive tests, that tests functionality. llvm-svn: 230195
147 lines
4.5 KiB
Plaintext
147 lines
4.5 KiB
Plaintext
# Checks that the linker picks the first group in the output file when the file
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# have some members dont appear in the first group.
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# 1a.s
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# ------
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# .section .text,"axG",%progbits,foo_group,comdat
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# .weak foo
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#foo:
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# .word 0
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# 1b.s
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# -----
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# .section .text,"axG",%progbits,foo_group,comdat
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# .global bar
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#bar:
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#RUN: yaml2obj -format=elf -docnum 1 %s -o %t.group1a.o
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#RUN: yaml2obj -format=elf -docnum 2 %s -o %t.group1b.o
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#RUN: lld -flavor gnu -target x86_64 %t.group1a.o %t.group1b.o \
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#RUN: --noinhibit-exec --output-filetype=yaml -o %t2.out.yaml
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#RUN: lld -flavor gnu -target x86_64 %t.group1a.o %t.group1b.o \
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#RUN: --noinhibit-exec -o %t2.out
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#RUN: FileCheck %s -check-prefix=CHECKGROUP < %t2.out.yaml
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#RUN: llvm-readobj -sections %t2.out | FileCheck %s -check-prefix=CHECKGROUPSECTIONS
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#RUN: llvm-readobj -symbols %t2.out | FileCheck %s -check-prefix=CHECKSYMBOLS
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#CHECKGROUP: - name: foo
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#CHECKGROUP: scope: global
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#CHECKGROUP: merge: as-weak
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#CHECKGROUP: section-name: .text
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#CHECKGROUP: - name: foo_group
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#CHECKGROUP: scope: global
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#CHECKGROUP: type: group-comdat
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#CHECKGROUP: section-choice: custom-required
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#CHECKGROUP: section-name: .group
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#CHECKGROUP: permissions: ---
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#CHECKGROUP: references:
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#CHECKGROUP: - kind: group-child
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#CHECKGROUP: offset: 0
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#CHECKGROUP: target: foo
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#CHECKGROUPSECTIONS: Section {
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#CHECKGROUPSECTIONS: Name: .text
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#CHECKGROUPSECTIONS: Type: SHT_PROGBITS
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#CHECKGROUPSECTIONS: Flags [ (0x6)
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#CHECKGROUPSECTIONS: SHF_ALLOC (0x2)
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#CHECKGROUPSECTIONS: SHF_EXECINSTR (0x4)
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#CHECKGROUPSECTIONS: ]
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#CHECKGROUPSECTIONS: Size: 2
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#CHECKGROUPSECTIONS: AddressAlignment: 1
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#CHECKGROUPSECTIONS: }
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#CHECKSYMBOLS: Name: foo
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#CHECKSYMBOLS: Type: Function
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#CHECKSYMBOLS: Section: .text
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---
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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OSABI: ELFOSABI_GNU
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Type: ET_REL
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Machine: EM_X86_64
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Sections:
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- Name: .group
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Type: SHT_GROUP
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Link: .symtab
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AddressAlign: 0x0000000000000004
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Info: foo_group
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Members:
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- SectionOrType: GRP_COMDAT
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- SectionOrType: .text
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- Name: .data
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Type: SHT_PROGBITS
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Flags: [ SHF_WRITE, SHF_ALLOC ]
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AddressAlign: 0x0000000000000004
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Content: ''
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- Name: .bss
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Type: SHT_NOBITS
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Flags: [ SHF_WRITE, SHF_ALLOC ]
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AddressAlign: 0x0000000000000004
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Content: ''
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR, SHF_GROUP ]
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AddressAlign: 0x0000000000000001
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Content: '0000'
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Symbols:
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Local:
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- Name: foo_group
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Section: .group
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- Name: .text
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Type: STT_SECTION
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Section: .text
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- Name: .data
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Type: STT_SECTION
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Section: .data
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- Name: .bss
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Type: STT_SECTION
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Section: .bss
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Weak:
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- Name: foo
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Section: .text
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...
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---
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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OSABI: ELFOSABI_GNU
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Type: ET_REL
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Machine: EM_X86_64
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Sections:
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- Name: .group
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Type: SHT_GROUP
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Link: .symtab
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AddressAlign: 0x0000000000000004
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Info: foo_group
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Members:
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- SectionOrType: GRP_COMDAT
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- SectionOrType: .text
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- Name: .data
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Type: SHT_PROGBITS
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Flags: [ SHF_WRITE, SHF_ALLOC ]
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AddressAlign: 0x0000000000000004
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Content: ''
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- Name: .bss
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Type: SHT_NOBITS
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Flags: [ SHF_WRITE, SHF_ALLOC ]
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AddressAlign: 0x0000000000000004
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Content: ''
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR, SHF_GROUP ]
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AddressAlign: 0x0000000000000001
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Content: ''
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Symbols:
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Local:
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- Name: foo_group
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Section: .group
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- Name: .text
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Type: STT_SECTION
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Section: .text
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- Name: .data
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Type: STT_SECTION
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Section: .data
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- Name: .bss
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Type: STT_SECTION
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Section: .bss
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Global:
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- Name: bar
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Section: .text
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...
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