0af07c0787
... 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
191 lines
4.0 KiB
ArmAsm
191 lines
4.0 KiB
ArmAsm
# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
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# RUN: ld.lld %t -o %t2
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# RUN: llvm-readobj --sections --symbols %t2 | FileCheck -check-prefix=NOGC %s
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# RUN: ld.lld --gc-sections --print-gc-sections %t -o %t2 | FileCheck --check-prefix=GC1-DISCARD %s
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# RUN: llvm-readobj --sections --symbols %t2 | FileCheck -check-prefix=GC1 %s
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# RUN: ld.lld --export-dynamic --gc-sections %t -o %t2
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# RUN: llvm-readobj --sections --symbols %t2 | FileCheck -check-prefix=GC2 %s
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# RUN: llvm-mc -filetype=obj -triple=x86_64 --crel %s -o %t.o
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# RUN: ld.lld --gc-sections --print-gc-sections %t.o -o %t2 | FileCheck --check-prefix=GC1-DISCARD %s
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# RUN: llvm-readobj --sections --symbols %t2 | FileCheck -check-prefix=GC1 %s
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# NOGC: Name: .eh_frame
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# NOGC: Name: .text
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# NOGC: Name: .init
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# NOGC: Name: .init_x
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# NOGC: Name: .fini
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# NOGC: Name: .tdata
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# NOGC: Name: .tbss
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# NOGC: Name: .ctors
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# NOGC: Name: .dtors
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# NOGC: Name: .fini_array
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# NOGC: Name: .init_array
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# NOGC: Name: .preinit_array
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# NOGC: Name: .jcr
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# NOGC: Name: .jcr_x
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# NOGC: Name: .debug_pubtypes
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# NOGC: Name: .comment
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# NOGC: Name: a
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# NOGC: Name: b
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# NOGC: Name: c
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# NOGC: Name: e
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# NOGC: Name: f
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# NOGC: Name: g
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# NOGC: Name: h
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# NOGC: Name: x
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# NOGC: Name: y
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# NOGC: Name: d
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# GC1-DISCARD: removing unused section {{.*}}:(.text.d)
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# GC1-DISCARD-NEXT: removing unused section {{.*}}:(.text.x)
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# GC1-DISCARD-NEXT: removing unused section {{.*}}:(.text.y)
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# GC1-DISCARD-NEXT: removing unused section {{.*}}:(.tbss.f)
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# GC1-DISCARD-NEXT: removing unused section {{.*}}:(.tdata.h)
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# GC1-DISCARD-NEXT: removing unused section {{.*}}:(.init_x)
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# GC1-DISCARD-NEXT: removing unused section {{.*}}:(.jcr_x)
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# GC1-DISCARD-EMPTY:
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# GC1: Name: .eh_frame
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# GC1: Name: .text
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# GC1: Name: .init
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# GC1: Name: .fini
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# GC1: Name: .tdata
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# GC1: Name: .tbss
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# GC1: Name: .ctors
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# GC1: Name: .dtors
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# GC1: Name: .fini_array
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# GC1: Name: .init_array
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# GC1: Name: .preinit_array
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# GC1: Name: .jcr
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# GC1: Name: .debug_pubtypes
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# GC1: Name: .comment
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# GC1: Name: a
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# GC1: Name: b
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# GC1: Name: c
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# GC1: Name: e
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# GC1-NOT: Name: f
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# GC1: Name: g
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# GC1-NOT: Name: h
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# GC1-NOT: Name: x
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# GC1-NOT: Name: y
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# GC1-NOT: Name: d
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# GC2: Name: .eh_frame
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# GC2: Name: .text
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# GC2: Name: .init
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# GC2: Name: .fini
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# GC2: Name: .tdata
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# GC2: Name: .tbss
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# GC2: Name: .ctors
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# GC2: Name: .dtors
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# GC2: Name: .fini_array
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# GC2: Name: .init_array
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# GC2: Name: .preinit_array
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# GC2: Name: .jcr
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# GC2: Name: .debug_pubtypes
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# GC2: Name: .comment
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# GC2: Name: a
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# GC2: Name: b
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# GC2: Name: c
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# GC2: Name: e
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# GC2-NOT: Name: f
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# GC2: Name: g
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# GC2-NOT: Name: h
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# GC2-NOT: Name: x
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# GC2-NOT: Name: y
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# GC2: Name: d
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.globl _start, d
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.protected a, b, c, e, f, g, h, x, y
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_start:
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call a
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.section .text.a,"ax",@progbits
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a:
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call _start
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call b
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.section .text.b,"ax",@progbits
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b:
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leaq e@tpoff(%rax),%rdx
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call c
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.section .text.c,"ax",@progbits
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c:
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leaq g@tpoff(%rax),%rdx
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.section .text.d,"ax",@progbits
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d:
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nop
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.section .text.x,"ax",@progbits
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x:
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call y
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.section .text.y,"ax",@progbits
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y:
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call x
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.section .tbss.e,"awT",@nobits
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e:
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.quad 0
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.section .tbss.f,"awT",@nobits
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f:
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.quad 0
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.section .tdata.g,"awT",@progbits
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g:
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.quad 0
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.section .tdata.h,"awT",@progbits
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h:
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.quad 0
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.section .ctors,"aw",@progbits
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.quad 0
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.section .dtors,"aw",@progbits
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.quad 0
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.section .init,"ax"
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.quad 0
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.section .init_x,"ax"
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.quad 0
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.section .fini,"ax"
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.quad 0
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.section .fini_array,"aw",@fini_array
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.quad 0
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# https://golang.org/cl/373734
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.section .init_array,"aw",@progbits
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.quad 0
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# Work around https://github.com/rust-lang/rust/issues/92181
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.section .init_array.00001,"aw",@progbits
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.quad 0
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.section .preinit_array,"aw",@preinit_array
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.quad 0
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.section .jcr,"aw"
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.quad 0
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.section .jcr_x,"aw"
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.quad 0
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.section .eh_frame,"a",@unwind
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.quad 0
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.section .debug_pubtypes,"",@progbits
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.quad 0
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.section .comment,"MS",@progbits,8
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.quad 0
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