f1ca2a0967
--compress-sections <section-glib>=[none|zlib|zstd] is similar to --compress-debug-sections but applies to broader sections without the SHF_ALLOC flag. lld will report an error if a SHF_ALLOC section is matched. An interesting use case is to compress `.strtab`/`.symtab`, which consume a significant portion of the file size (15.1% for a release build of Clang). An older revision is available at https://reviews.llvm.org/D154641 . This patch focuses on non-allocated sections for safety. Moving `maybeCompress` as D154641 does not handle STT_SECTION symbols for `-r --compress-debug-sections=zlib` (see `relocatable-section-symbol.s` from #66804). Since different output sections may use different compression algorithms, we need CompressedData::type to generalize config->compressDebugSections. GNU ld feature request: https://sourceware.org/bugzilla/show_bug.cgi?id=27452 Link: https://discourse.llvm.org/t/rfc-compress-arbitrary-sections-with-ld-lld-compress-sections/71674 Pull Request: https://github.com/llvm/llvm-project/pull/84855
92 lines
3.9 KiB
ArmAsm
92 lines
3.9 KiB
ArmAsm
# REQUIRES: x86, zlib, zstd
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# RUN: rm -rf %t && mkdir %t && cd %t
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o a.o
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# RUN: ld.lld -pie a.o -o out --compress-sections '*0=zlib' --compress-sections '*0=none' --compress-sections 'nomatch=none'
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# RUN: llvm-readelf -SrsX out | FileCheck %s --check-prefix=CHECK1
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# CHECK1: Name Type Address Off Size ES Flg Lk Inf Al
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# CHECK1: foo0 PROGBITS [[#%x,FOO0:]] [[#%x,]] [[#%x,]] 00 A 0 0 8
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# CHECK1-NEXT: foo1 PROGBITS [[#%x,FOO1:]] [[#%x,]] [[#%x,]] 00 A 0 0 8
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# CHECK1-NEXT: .text PROGBITS [[#%x,TEXT:]] [[#%x,]] [[#%x,]] 00 AX 0 0 4
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# CHECK1: nonalloc0 PROGBITS 0000000000000000 [[#%x,]] [[#%x,]] 00 0 0 8
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# CHECK1-NEXT: nonalloc1 PROGBITS 0000000000000000 [[#%x,]] [[#%x,]] 00 0 0 8
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# CHECK1-NEXT: .debug_str PROGBITS 0000000000000000 [[#%x,]] [[#%x,]] 01 MS 0 0 1
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# CHECK1: 0000000000000010 0 NOTYPE LOCAL DEFAULT [[#]] (nonalloc0) sym0
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# CHECK1: 0000000000000008 0 NOTYPE LOCAL DEFAULT [[#]] (nonalloc1) sym1
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# RUN: ld.lld -pie a.o --compress-sections '*c0=zlib' --compress-sections .debug_str=zstd -o out2
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# RUN: llvm-readelf -SrsX -x nonalloc0 -x .debug_str out2 | FileCheck %s --check-prefix=CHECK2
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# CHECK2: Name Type Address Off Size ES Flg Lk Inf Al
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# CHECK2: foo0 PROGBITS [[#%x,FOO0:]] [[#%x,]] [[#%x,]] 00 A 0 0 8
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# CHECK2-NEXT: foo1 PROGBITS [[#%x,FOO1:]] [[#%x,]] [[#%x,]] 00 A 0 0 8
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# CHECK2-NEXT: .text PROGBITS [[#%x,TEXT:]] [[#%x,]] [[#%x,]] 00 AX 0 0 4
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# CHECK2: nonalloc0 PROGBITS 0000000000000000 [[#%x,]] [[#%x,]] 00 C 0 0 1
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# CHECK2-NEXT: nonalloc1 PROGBITS 0000000000000000 [[#%x,]] [[#%x,]] 00 0 0 8
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# CHECK2-NEXT: .debug_str PROGBITS 0000000000000000 [[#%x,]] [[#%x,]] 01 MSC 0 0 1
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# CHECK2: 0000000000000010 0 NOTYPE LOCAL DEFAULT [[#]] (nonalloc0) sym0
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# CHECK2: 0000000000000008 0 NOTYPE LOCAL DEFAULT [[#]] (nonalloc1) sym1
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# CHECK2: Hex dump of section 'nonalloc0':
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## zlib with ch_size=0x10
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# CHECK2-NEXT: 01000000 00000000 10000000 00000000
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# CHECK2-NEXT: 01000000 00000000 {{.*}}
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# CHECK2: Hex dump of section '.debug_str':
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## zstd with ch_size=0x38
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# CHECK2-NEXT: 02000000 00000000 38000000 00000000
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# CHECK2-NEXT: 01000000 00000000 {{.*}}
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## --compress-debug-sections=none takes precedence.
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# RUN: ld.lld a.o --compress-debug-sections=none --compress-sections .debug_str=zstd -o out3
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# RUN: llvm-readelf -S out3 | FileCheck %s --check-prefix=CHECK3
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# CHECK3: .debug_str PROGBITS 0000000000000000 [[#%x,]] [[#%x,]] 01 MS 0 0 1
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# RUN: not ld.lld a.o --compress-sections '*0=zlib' 2>&1 | \
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# RUN: FileCheck %s --check-prefix=ERR-ALLOC --implicit-check-not=error:
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# ERR-ALLOC: error: --compress-sections: section 'foo0' with the SHF_ALLOC flag cannot be compressed
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# RUN: not ld.lld --compress-sections=foo a.o 2>&1 | \
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# RUN: FileCheck %s --check-prefix=ERR1 --implicit-check-not=error:
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# ERR1: error: --compress-sections: parse error, not 'section-glob=[none|zlib|zstd]'
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# RUN: not ld.lld --compress-sections 'a[=zlib' a.o 2>&1 | \
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# RUN: FileCheck %s --check-prefix=ERR2 --implicit-check-not=error:
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# ERR2: error: --compress-sections: invalid glob pattern, unmatched '['
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# RUN: not ld.lld a.o --compress-sections='.debug*=zlib-gabi' --compress-sections='.debug*=' 2>&1 | \
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# RUN: FileCheck -check-prefix=ERR3 %s
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# ERR3: unknown --compress-sections value: zlib-gabi
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# ERR3-NEXT: --compress-sections: parse error, not 'section-glob=[none|zlib|zstd]'
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.globl _start
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_start:
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ret
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.section foo0,"a"
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.balign 8
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.quad .text-.
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.quad .text-.
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.section foo1,"a"
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.balign 8
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.quad .text-.
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.quad .text-.
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.section nonalloc0,""
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.balign 8
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.quad .text+1
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.quad .text+2
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sym0:
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.section nonalloc1,""
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.balign 8
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.quad 42
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sym1:
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.section .debug_str,"MS",@progbits,1
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.Linfo_string0:
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.asciz "AAAAAAAAAAAAAAAAAAAAAAAAAAA"
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.Linfo_string1:
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.asciz "BBBBBBBBBBBBBBBBBBBBBBBBBBB"
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