d3e5b6f753
--build-id was introduced as "approximation of true uniqueness across all
binaries that might be used by overlapping sets of people". It does not require
the some resistance mentioned below. In practice, people just use --build-id=md5
for 16-byte build ID and --build-id=sha1 for 20-byte build ID.
BLAKE3 has 256-bit key length, which provides 128-bit security against
(second-)preimage, collision, and differentiability attacks. Its portable
implementation is fast. It additionally provides Arm Neon/AVX2/AVX-512. Just
implement --build-id={md5,sha1} with truncated BLAKE3.
Linking clang 14 RelWithDebInfo with --threads=8 on a Skylake CPU:
* 1.13x as fast with --build-id=md5
* 1.15x as fast with --build-id=sha1
--threads=4 on Apple m1:
* 1.25x as fast with --build-id=md5
* 1.17x as fast with --build-id=sha1
Reviewed By: ikudrin
Differential Revision: https://reviews.llvm.org/D121531
100 lines
3.6 KiB
ArmAsm
100 lines
3.6 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 --build-id %t -o %t2
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# RUN: llvm-readobj -S %t2 | FileCheck -check-prefix=ALIGN %s
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# RUN: ld.lld --build-id %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=DEFAULT %s
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# RUN: ld.lld --build-id=fast %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=DEFAULT %s
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# RUN: ld.lld --build-id %t -o %t2 --threads=1
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=DEFAULT %s
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# RUN: ld.lld --build-id=md5 %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=MD5 %s
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# RUN: ld.lld --build-id=md5 %t -o %t2 --threads=1
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=MD5 %s
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# RUN: ld.lld --build-id=sha1 %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=SHA1 %s
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# RUN: ld.lld --build-id=sha1 %t -o %t2 --threads=1
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=SHA1 %s
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# RUN: ld.lld --build-id=tree %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=SHA1 %s
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# RUN: ld.lld --build-id=tree %t -o %t2 --threads=1
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=SHA1 %s
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# RUN: ld.lld --build-id=uuid %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=UUID %s
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# RUN: ld.lld --build-id=0x12345678 %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=HEX %s
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# RUN: ld.lld %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=NONE %s
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# RUN: ld.lld --build-id=md5 --build-id=none %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=NONE %s
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# RUN: ld.lld --build-id --build-id=none %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=NONE %s
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# RUN: ld.lld --build-id=none --build-id %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=DEFAULT %s
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.globl _start
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_start:
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nop
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.section .note.test, "a", @note
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.quad 42
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# ALIGN: Name: .note.gnu.build-id
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# ALIGN-NEXT: Type: SHT_NOTE
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# ALIGN-NEXT: Flags [
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# ALIGN-NEXT: SHF_ALLOC
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# ALIGN-NEXT: ]
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# ALIGN-NEXT: Address:
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# ALIGN-NEXT: Offset: [[_:0x[0-9A-Z]*(0|4|8|C)$]]
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# ALIGN-NEXT: Size:
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# ALIGN-NEXT: Link:
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# ALIGN-NEXT: Info:
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# ALIGN-NEXT: AddressAlignment: 4
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# DEFAULT: Contents of section .note.test:
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# DEFAULT: Contents of section .note.gnu.build-id:
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# DEFAULT-NEXT: 04000000 08000000 03000000 474e5500 ............GNU.
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# DEFAULT-NEXT: 7e8ddeff 3ed41fa3
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# MD5: Contents of section .note.gnu.build-id:
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# MD5-NEXT: 04000000 10000000 03000000 474e5500 ............GNU.
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# MD5-NEXT: dbf0bc13 b3ff11e9 fde6e17c 0304983c
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# SHA1: Contents of section .note.gnu.build-id:
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# SHA1-NEXT: 04000000 14000000 03000000 474e5500 ............GNU.
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# SHA1-NEXT: 1215775f d3b60050 70afd970 e8a10972
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# UUID: Contents of section .note.gnu.build-id:
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# UUID-NEXT: 04000000 10000000 03000000 474e5500 ............GNU.
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# HEX: Contents of section .note.gnu.build-id:
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# HEX-NEXT: 04000000 04000000 03000000 474e5500 ............GNU.
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# HEX-NEXT: 12345678
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# NONE-NOT: Contents of section .note.gnu.build-id:
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# RUN: ld.lld --build-id=sha1 -z separate-loadable-segments %t -o %t2
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# RUN: llvm-readelf -x .note.gnu.build-id %t2 | FileCheck --check-prefix=SEPARATE %s
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# SEPARATE: Hex dump of section '.note.gnu.build-id':
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# SEPARATE-NEXT: 0x00200198 04000000 14000000 03000000 474e5500
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# SEPARATE-NEXT: 0x002001a8 5cd067a4 2631c0fd 42029037 4b8e0938
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# RUN: ld.lld --build-id=sha1 --no-rosegment %t -o %t2
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# RUN: llvm-readelf -x .note.gnu.build-id %t2 | FileCheck --check-prefix=NORO %s
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# NORO: Hex dump of section '.note.gnu.build-id':
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# NORO-NEXT: 0x00200160 04000000 14000000 03000000 474e5500
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# NORO-NEXT: 0x00200170 a328cc99 45bfc3fc a9fc8615 37102f9d
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