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The --keep-unique <symbol> option is taken from gold. The intention is that <symbol> will be prevented from being folded by ICF. Although not specifically mentioned in the documentation <symbol> only matches global symbols, with a warning if the symbol is not found. The implementation finds the Section defining <symbol> and removes it from the set of sections considered for ICF. Differential Revision: https://reviews.llvm.org/D46755 llvm-svn: 332332
44 lines
1.3 KiB
ArmAsm
44 lines
1.3 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 --icf=all --print-icf-sections | FileCheck %s
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# RUN: ld.lld %t -o %t2 --keep-unique f2 --keep-unique f4 --keep-unique f5 --icf=all --print-icf-sections 2>&1 | FileCheck %s -check-prefix=CHECK-KEEP
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// Base case, expect only .text.f1 to be kept
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// CHECK: selected section {{.*}}:(.text.f1)
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// CHECK-NEXT: removing identical section {{.*}}:(.text.f2)
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// CHECK-NEXT: removing identical section {{.*}}:(.text.f3)
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// CHECK-NEXT: removing identical section {{.*}}:(.text.f4)
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// CHECK-NEXT: removing identical section {{.*}}:(.text.f5)
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// With --keep-unique f2, f4 and f5 we expect only f3 and f5 to be removed.
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// f5 is not matched by --keep-unique as it is a local symbol.
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// CHECK-KEEP: warning: could not find symbol f5 to keep unique
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// CHECK-KEEP: selected section {{.*}}:(.text.f1)
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// CHECK-KEEP-NEXT: removing identical section {{.*}}:(.text.f3)
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// CHECK-KEEP-NEXT: removing identical section {{.*}}:(.text.f5)
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.globl _start, f1, f2, f3, f4
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_start:
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ret
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.section .text.f1, "ax"
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f1:
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nop
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.section .text.f2, "ax"
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f2:
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nop
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.section .text.f3, "ax"
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f3:
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nop
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.section .text.f4, "ax"
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f4:
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nop
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# f5 is local, not found by --keep-unique f5
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.section .text.f5, "ax"
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f5:
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nop
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