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llvm-project/lld/test/ELF/debug-names.s
Fangrui Song 0af07c0787
[ELF] Support relocatable files using CREL with explicit addends 
... using the temporary section type code 0x40000020
(`clang -c -Wa,--crel,--allow-experimental-crel`). LLVM will change the
code and break compatibility (Clang and lld of different versions are
not guaranteed to cooperate, unlike other features). CREL with implicit
addends are not supported.

---

Introduce `RelsOrRelas::crels` to iterate over SHT_CREL sections and
update users to check `crels`.

(The decoding performance is critical and error checking is difficult.
Follow `skipLeb` and `R_*LEB128` handling, do not use
`llvm::decodeULEB128`, whichs compiles to a lot of code.)

A few users (e.g. .eh_frame, LLDDwarfObj, s390x) require random access. Pass
`/*supportsCrel=*/false` to `relsOrRelas` to allocate a buffer and
convert CREL to RELA (`relas` instead of `crels` will be used). Since
allocating a buffer increases, the conversion is only performed when
absolutely necessary.

---

Non-alloc SHT_CREL sections may be created in -r and --emit-relocs
links. SHT_CREL and SHT_RELA components need reencoding since
r_offset/r_symidx/r_type/r_addend may change. (r_type may change because
relocations referencing a symbol in a discarded section are converted to
`R_*_NONE`).

* SHT_CREL components: decode with `RelsOrRelas` and re-encode (`OutputSection::finalizeNonAllocCrel`)
* SHT_RELA components: convert to CREL (`relToCrel`). An output section can only have one relocation section.
* SHT_REL components: print an error for now.

SHT_REL to SHT_CREL conversion for -r/--emit-relocs is complex and
unsupported yet.

Link: https://discourse.llvm.org/t/rfc-crel-a-compact-relocation-format-for-elf/77600

Pull Request: https://github.com/llvm/llvm-project/pull/98115
2024-08-01 10:22:03 -07:00

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# debug-names.s was generated with:
# - clang++ -g -O0 -gpubnames -fdebug-compilation-dir='/proc/self/cwd' \
# -S a.cpp -o a.s
# a.cpp contents:
# struct t1 { };
# void f1(t1) { }
# REQUIRES: x86
# RUN: rm -rf %t && split-file %s %t && cd %t
# RUN: llvm-mc -filetype=obj -triple=x86_64 --crel a.s -o a.o
# RUN: llvm-mc -filetype=obj -triple=x86_64 b.s -o b.o
# RUN: ld.lld --debug-names --no-debug-names a.o b.o -o out0
# RUN: llvm-readelf -SW out0 | FileCheck %s --check-prefix=NO_MERGE
# NO_MERGE: Name Type Address Off Size ES Flg Lk Inf Al
# NO_MERGE: .debug_names PROGBITS 0000000000000000 [[#%x,]] 000110 00 0 0 4
# RUN: ld.lld --debug-names a.o b.o -o out
# RUN: llvm-dwarfdump -debug-names out | FileCheck %s --check-prefix=DWARF
# RUN: llvm-readelf -SW out | FileCheck %s --check-prefix=READELF
## Test we can handle concatenated .debug_names.
# RUN: ld.lld -r a.o b.o -o ab.o
# RUN: ld.lld --debug-names ab.o -o out1
# RUN: llvm-dwarfdump -debug-names out1 | FileCheck %s --check-prefix=DWARF
# READELF: Name Type Address Off Size ES Flg Lk Inf Al
# READELF: .debug_names PROGBITS 0000000000000000 [[#%x,]] 0000cc 00 0 0 4
## Test we can handle compressed input and --compress-debug-sections compresses output .debug_names.
# RUN: %if zlib %{ llvm-objcopy --compress-debug-sections=zlib a.o a.zlib.o %}
# RUN: %if zlib %{ ld.lld --debug-names --compress-debug-sections=zlib a.zlib.o b.o -o out.zlib %}
# RUN: %if zlib %{ llvm-readelf -S out.zlib | FileCheck %s --check-prefix=READELF-ZLIB %}
# RUN: %if zlib %{ llvm-objcopy --decompress-debug-sections out.zlib out.zlib.de %}
# RUN: %if zlib %{ llvm-dwarfdump -debug-names out.zlib.de | FileCheck %s --check-prefix=DWARF %}
# READELF-ZLIB: Name Type Address Off Size ES Flg Lk Inf Al
# READELF-ZLIB: .debug_names PROGBITS 0000000000000000 [[#%x,]] [[#%x,]] 00 C 0 0 1
# DWARF: .debug_names contents:
# DWARF: Name Index @ 0x0 {
# DWARF-NEXT: Header {
# DWARF-NEXT: Length: 0xC8
# DWARF-NEXT: Format: DWARF32
# DWARF-NEXT: Version: 5
# DWARF-NEXT: CU count: 2
# DWARF-NEXT: Local TU count: 0
# DWARF-NEXT: Foreign TU count: 0
# DWARF-NEXT: Bucket count: 5
# DWARF-NEXT: Name count: 5
# DWARF-NEXT: Abbreviations table size: 0x1F
# DWARF-NEXT: Augmentation: 'LLVM0700'
# DWARF: Compilation Unit offsets [
# DWARF-NEXT: CU[0]: 0x00000000
# DWARF-NEXT: CU[1]: 0x0000000c
# DWARF: Abbreviations [
# DWARF-NEXT: Abbreviation 0x1 {
# DWARF: Tag: DW_TAG_structure_type
# DWARF-NEXT: DW_IDX_die_offset: DW_FORM_ref4
# DWARF-NEXT: DW_IDX_parent: DW_FORM_flag_present
# DWARF-NEXT: DW_IDX_compile_unit: DW_FORM_data1
# DWARF: Abbreviation 0x2 {
# DWARF-NEXT: Tag: DW_TAG_subprogram
# DWARF-NEXT: DW_IDX_die_offset: DW_FORM_ref4
# DWARF-NEXT: DW_IDX_parent: DW_FORM_flag_present
# DWARF-NEXT: DW_IDX_compile_unit: DW_FORM_data1
# DWARF: Abbreviation 0x3 {
# DWARF-NEXT: Tag: DW_TAG_base_type
# DWARF-NEXT: DW_IDX_die_offset: DW_FORM_ref4
# DWARF-NEXT: DW_IDX_parent: DW_FORM_flag_present
# DWARF-NEXT: DW_IDX_compile_unit: DW_FORM_data1
# DWARF: Bucket 0 [
# DWARF-NEXT: EMPTY
# DWARF-NEXT: ]
# DWARF-NEXT: Bucket 1 [
# DWARF-NEXT: Name 1 {
# DWARF-NEXT: Hash: 0x59796A
# DWARF-NEXT: String: 0x00000089 "t1"
# DWARF-NEXT: Entry @ 0xaa {
# DWARF-NEXT: Abbrev: 0x1
# DWARF-NEXT: Tag: DW_TAG_structure_type
# DWARF-NEXT: DW_IDX_die_offset: 0x0000003a
# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
# DWARF-NEXT: DW_IDX_compile_unit: 0x00
# DWARF-NEXT: }
# DWARF-NEXT: Entry @ 0xb0 {
# DWARF-NEXT: Abbrev: 0x1
# DWARF-NEXT: Tag: DW_TAG_structure_type
# DWARF-NEXT: DW_IDX_die_offset: 0x00000042
# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
# DWARF-NEXT: DW_IDX_compile_unit: 0x01
# DWARF-NEXT: }
# DWARF-NEXT: }
# DWARF-NEXT: Name 2 {
# DWARF-NEXT: Hash: 0x5355B2BE
# DWARF-NEXT: String: 0x00000080 "_Z2f12t1"
# DWARF-NEXT: Entry @ 0xbe {
# DWARF-NEXT: Abbrev: 0x2
# DWARF-NEXT: Tag: DW_TAG_subprogram
# DWARF-NEXT: DW_IDX_die_offset: 0x00000023
# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
# DWARF-NEXT: DW_IDX_compile_unit: 0x00
# DWARF-NEXT: }
# DWARF-NEXT: }
# DWARF-NEXT: Name 3 {
# DWARF-NEXT: Hash: 0x7C9A7F6A
# DWARF-NEXT: String: 0x00000111 "main"
# DWARF-NEXT: Entry @ 0xc5 {
# DWARF-NEXT: Abbrev: 0x2
# DWARF-NEXT: Tag: DW_TAG_subprogram
# DWARF-NEXT: DW_IDX_die_offset: 0x00000023
# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
# DWARF-NEXT: DW_IDX_compile_unit: 0x01
# DWARF-NEXT: }
# DWARF-NEXT: }
# DWARF-NEXT: ]
# DWARF-NEXT: Bucket 2 [
# DWARF-NEXT: EMPTY
# DWARF-NEXT: ]
# DWARF-NEXT: Bucket 3 [
# DWARF-NEXT: Name 4 {
# DWARF-NEXT: Hash: 0xB888030
# DWARF-NEXT: String: 0x00000116 "int"
# DWARF-NEXT: Entry @ 0xb7 {
# DWARF-NEXT: Abbrev: 0x3
# DWARF-NEXT: Tag: DW_TAG_base_type
# DWARF-NEXT: DW_IDX_die_offset: 0x0000003e
# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
# DWARF-NEXT: DW_IDX_compile_unit: 0x01
# DWARF-NEXT: }
# DWARF-NEXT: }
# DWARF-NEXT: ]
# DWARF-NEXT: Bucket 4 [
# DWARF-NEXT: Name 5 {
# DWARF-NEXT: Hash: 0x59779C
# DWARF-NEXT: String: 0x0000007d "f1"
# DWARF-NEXT: Entry @ 0xa3 {
# DWARF-NEXT: Abbrev: 0x2
# DWARF-NEXT: Tag: DW_TAG_subprogram
# DWARF-NEXT: DW_IDX_die_offset: 0x00000023
# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
# DWARF-NEXT: DW_IDX_compile_unit: 0x00
# DWARF-NEXT: }
# DWARF-NEXT: }
# DWARF-NEXT: ]
#--- a.s
.text
.globl _Z2f12t1 # -- Begin function _Z2f12t1
.p2align 4, 0x90
.type _Z2f12t1,@function
_Z2f12t1: # @_Z2f12t1
.Lfunc_begin0:
.cfi_startproc
# %bb.0: # %entry
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset %rbp, -16
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
.Ltmp0:
popq %rbp
.cfi_def_cfa %rsp, 8
retq
.Ltmp1:
.Lfunc_end0:
.size _Z2f12t1, .Lfunc_end0-_Z2f12t1
.cfi_endproc
# -- End function
.section .debug_abbrev,"",@progbits
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 0 # EOM(3)
.section .debug_info,"",@progbits
.Lcu_begin0:
.long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
.Ldebug_info_start0:
.short 5 # DWARF version number
.byte 1 # DWARF Unit Type
.byte 8 # Address Size (in bytes)
.long .debug_abbrev # Offset Into Abbrev. Section
.Ldebug_info_end0:
.section .debug_str_offsets,"",@progbits
.long 28 # Length of String Offsets Set
.short 5
.short 0
.Lstr_offsets_base0:
.section .debug_str,"MS",@progbits,1
.Linfo_string0:
.asciz "clang version 19.0.0git (git@github.com:llvm/llvm-project.git 53b14cd9ce2b57da73d173fc876d2e9e199f5640)" # string offset=0
.Linfo_string1:
.asciz "a.cpp" # string offset=104
.Linfo_string2:
.asciz "/proc/self/cwd" # string offset=110
.Linfo_string3:
.asciz "f1" # string offset=125
.Linfo_string4:
.asciz "_Z2f12t1" # string offset=128
.Linfo_string5:
.asciz "t1" # string offset=137
.Laddr_table_base0:
.quad .Lfunc_begin0
.Ldebug_addr_end0:
.section .debug_names,"",@progbits
.long .Lnames_end0-.Lnames_start0 # Header: unit length
.Lnames_start0:
.short 5 # Header: version
.short 0 # Header: padding
.long 1 # Header: compilation unit count
.long 0 # Header: local type unit count
.long 0 # Header: foreign type unit count
.long 3 # Header: bucket count
.long 3 # Header: name count
.long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
.long 8 # Header: augmentation string size
.ascii "LLVM0700" # Header: augmentation string
.long .Lcu_begin0 # Compilation unit 0
.long 0 # Bucket 0
.long 1 # Bucket 1
.long 3 # Bucket 2
.long 5863324 # Hash in Bucket 1
.long 5863786 # Hash in Bucket 1
.long 1398125246 # Hash in Bucket 2
.long .Linfo_string3 # String in Bucket 1: f1
.long .Linfo_string5 # String in Bucket 1: t1
.long .Linfo_string4 # String in Bucket 2: _Z2f12t1
.long .Lnames0-.Lnames_entries0 # Offset in Bucket 1
.long .Lnames2-.Lnames_entries0 # Offset in Bucket 1
.long .Lnames1-.Lnames_entries0 # Offset in Bucket 2
.Lnames_abbrev_start0:
.byte 1 # Abbrev code
.byte 46 # DW_TAG_subprogram
.byte 3 # DW_IDX_die_offset
.byte 19 # DW_FORM_ref4
.byte 4 # DW_IDX_parent
.byte 25 # DW_FORM_flag_present
.byte 0 # End of abbrev
.byte 0 # End of abbrev
.byte 2 # Abbrev code
.byte 19 # DW_TAG_structure_type
.byte 3 # DW_IDX_die_offset
.byte 19 # DW_FORM_ref4
.byte 4 # DW_IDX_parent
.byte 25 # DW_FORM_flag_present
.byte 0 # End of abbrev
.byte 0 # End of abbrev
.byte 0 # End of abbrev list
.Lnames_abbrev_end0:
.Lnames_entries0:
.Lnames0:
.L1:
.byte 1 # Abbreviation code
.long 35 # DW_IDX_die_offset
.byte 0 # DW_IDX_parent
# End of list: f1
.Lnames2:
.L0:
.byte 2 # Abbreviation code
.long 58 # DW_IDX_die_offset
.byte 0 # DW_IDX_parent
# End of list: t1
.Lnames1:
.byte 1 # Abbreviation code
.long 35 # DW_IDX_die_offset
.byte 0 # DW_IDX_parent
# End of list: _Z2f12t1
.p2align 2, 0x0
.Lnames_end0:
.ident "clang version 19.0.0git (git@github.com:llvm/llvm-project.git 53b14cd9ce2b57da73d173fc876d2e9e199f5640)"
.section ".note.GNU-stack","",@progbits
.addrsig
.section .debug_line,"",@progbits
.Lline_table_start0:
#--- b.s
# Generated with:
# - clang++ -g -O0 -gpubnames -fdebug-compilation-dir='/proc/self/cwd' \
# -S b.cpp -o b.s
# b.cpp contents:
# struct t1 { };
# int main() {
# t1 v1;
# }
#
.text
.globl main # -- Begin function main
.p2align 4, 0x90
.type main,@function
main: # @main
.Lfunc_begin0:
.cfi_startproc
# %bb.0: # %entry
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset %rbp, -16
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
.Ltmp0:
xorl %eax, %eax
popq %rbp
.cfi_def_cfa %rsp, 8
retq
.Ltmp1:
.Lfunc_end0:
.size main, .Lfunc_end0-main
.cfi_endproc
# -- End function
.section .debug_abbrev,"",@progbits
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 0 # EOM(3)
.section .debug_info,"",@progbits
.Lcu_begin0:
.long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
.Ldebug_info_start0:
.short 5 # DWARF version number
.byte 1 # DWARF Unit Type
.byte 8 # Address Size (in bytes)
.long .debug_abbrev # Offset Into Abbrev. Section
.Ldebug_info_end0:
.section .debug_str_offsets,"",@progbits
.long 32 # Length of String Offsets Set
.short 5
.short 0
.Lstr_offsets_base0:
.section .debug_str,"MS",@progbits,1
.Linfo_string0:
.asciz "clang version 19.0.0git (git@github.com:llvm/llvm-project.git 53b14cd9ce2b57da73d173fc876d2e9e199f5640)" # string offset=0
.Linfo_string1:
.asciz "b.cpp" # string offset=104
.Linfo_string2:
.asciz "/proc/self/cwd" # string offset=110
.Linfo_string3:
.asciz "main" # string offset=125
.Linfo_string4:
.asciz "int" # string offset=130
.Linfo_string5:
.asciz "v1" # string offset=134
.Linfo_string6:
.asciz "t1" # string offset=137
.Laddr_table_base0:
.quad .Lfunc_begin0
.Ldebug_addr_end0:
.section .debug_names,"",@progbits
.long .Lnames_end0-.Lnames_start0 # Header: unit length
.Lnames_start0:
.short 5 # Header: version
.short 0 # Header: padding
.long 1 # Header: compilation unit count
.long 0 # Header: local type unit count
.long 0 # Header: foreign type unit count
.long 3 # Header: bucket count
.long 3 # Header: name count
.long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
.long 8 # Header: augmentation string size
.ascii "LLVM0700" # Header: augmentation string
.long .Lcu_begin0 # Compilation unit 0
.long 0 # Bucket 0
.long 1 # Bucket 1
.long 3 # Bucket 2
.long 5863786 # Hash in Bucket 1
.long 2090499946 # Hash in Bucket 1
.long 193495088 # Hash in Bucket 2
.long .Linfo_string6 # String in Bucket 1: t1
.long .Linfo_string3 # String in Bucket 1: main
.long .Linfo_string4 # String in Bucket 2: int
.long .Lnames2-.Lnames_entries0 # Offset in Bucket 1
.long .Lnames0-.Lnames_entries0 # Offset in Bucket 1
.long .Lnames1-.Lnames_entries0 # Offset in Bucket 2
.Lnames_abbrev_start0:
.byte 1 # Abbrev code
.byte 19 # DW_TAG_structure_type
.byte 3 # DW_IDX_die_offset
.byte 19 # DW_FORM_ref4
.byte 4 # DW_IDX_parent
.byte 25 # DW_FORM_flag_present
.byte 0 # End of abbrev
.byte 0 # End of abbrev
.byte 2 # Abbrev code
.byte 46 # DW_TAG_subprogram
.byte 3 # DW_IDX_die_offset
.byte 19 # DW_FORM_ref4
.byte 4 # DW_IDX_parent
.byte 25 # DW_FORM_flag_present
.byte 0 # End of abbrev
.byte 0 # End of abbrev
.byte 3 # Abbrev code
.byte 36 # DW_TAG_base_type
.byte 3 # DW_IDX_die_offset
.byte 19 # DW_FORM_ref4
.byte 4 # DW_IDX_parent
.byte 25 # DW_FORM_flag_present
.byte 0 # End of abbrev
.byte 0 # End of abbrev
.byte 0 # End of abbrev list
.Lnames_abbrev_end0:
.Lnames_entries0:
.Lnames2:
.L1:
.byte 1 # Abbreviation code
.long 66 # DW_IDX_die_offset
.byte 0 # DW_IDX_parent
# End of list: t1
.Lnames0:
.L2:
.byte 2 # Abbreviation code
.long 35 # DW_IDX_die_offset
.byte 0 # DW_IDX_parent
# End of list: main
.Lnames1:
.L0:
.byte 3 # Abbreviation code
.long 62 # DW_IDX_die_offset
.byte 0 # DW_IDX_parent
# End of list: int
.p2align 2, 0x0
.Lnames_end0:
.ident "clang version 19.0.0git (git@github.com:llvm/llvm-project.git 53b14cd9ce2b57da73d173fc876d2e9e199f5640)"
.section ".note.GNU-stack","",@progbits
.addrsig
.section .debug_line,"",@progbits
.Lline_table_start0:
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