d24b94f070
If foo is referenced in any object file, bitcode file or shared object, `__wrap_foo` should be retained as the redirection target of sym (f96ff3c0f8ebd941b3f6b345164c3d858b781484). If the object file defining foo has foo references, we cannot easily distinguish the case from cases where foo is not referenced (we haven't scanned relocations). Retain `__wrap_foo` because we choose to wrap sym references regardless of whether sym is defined to keep non-LTO/LTO/relocatable links' behaviors similar https://sourceware.org/bugzilla/show_bug.cgi?id=26358 . If foo is defined in a shared object, `__wrap_foo` can still be omitted (`wrap-dynamic-undef.s`). Reviewed By: andrewng Differential Revision: https://reviews.llvm.org/D95152
82 lines
3.0 KiB
ArmAsm
82 lines
3.0 KiB
ArmAsm
# REQUIRES: x86
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# RUN: rm -rf %t && split-file %s %t
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %t/main.s -o %t/main.o
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %t/call-foo.s -o %t/call-foo.o
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %t/bar.s -o %t/bar.o
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# RUN: ld.lld -shared -soname=t.so %t/bar.o -o %t/bar.so
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %t/wrap.s -o %t/wrap.o
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# RUN: ld.lld -shared --soname=fixed %t/wrap.o -o %t/wrap.so
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## foo is defined, then referenced in another object file.
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# RUN: ld.lld -shared %t/main.o %t/call-foo.o --wrap foo -o %t1.so
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# RUN: llvm-readelf -r %t1.so | FileCheck %s --check-prefix=CHECK1
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# CHECK1: R_X86_64_JUMP_SLOT 0000000000000000 bar + 0
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# CHECK1-NEXT: R_X86_64_JUMP_SLOT 0000000000000000 __wrap_foo + 0
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## --no-allow-shlib-undefined errors because __real_foo is not defined.
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# RUN: not ld.lld %t/main.o %t/bar.so -o /dev/null 2>&1 | FileCheck --check-prefix=ERR %s
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# ERR: {{.*}}.so: undefined reference to __real_foo [--no-allow-shlib-undefined]
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## --wrap=foo defines __real_foo.
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# RUN: ld.lld %t/main.o %t/bar.so --wrap=foo -o %t2
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# RUN: llvm-readelf --dyn-syms %t2 | FileCheck %s --check-prefix=CHECK2
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## See wrap-plt2.s why __wrap_foo is retained.
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# CHECK2: Symbol table '.dynsym' contains 4 entries:
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# CHECK2: NOTYPE LOCAL DEFAULT UND
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# CHECK2-NEXT: NOTYPE GLOBAL DEFAULT UND bar
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# CHECK2-NEXT: NOTYPE GLOBAL DEFAULT UND __wrap_foo
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# CHECK2-NEXT: NOTYPE GLOBAL DEFAULT 6 foo
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## __wrap_bar is undefined.
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# RUN: ld.lld -shared %t/main.o --wrap=bar -o %t3.so
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# RUN: llvm-readelf -r --dyn-syms %t3.so | FileCheck %s --check-prefix=CHECK3
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# CHECK3: R_X86_64_JUMP_SLOT 0000000000000000 __wrap_bar + 0
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# CHECK3: Symbol table '.dynsym' contains 4 entries:
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# CHECK3: NOTYPE LOCAL DEFAULT UND
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# CHECK3-NEXT: NOTYPE GLOBAL DEFAULT UND __wrap_bar
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# CHECK3-NEXT: NOTYPE GLOBAL DEFAULT 6 _start
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# CHECK3-NEXT: NOTYPE GLOBAL DEFAULT 6 foo
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## __wrap_bar is defined in %t/wrap.so.
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# RUN: ld.lld -shared %t/main.o %t/wrap.so --wrap=bar -o %t4.so
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# RUN: llvm-readelf -r --dyn-syms %t4.so | FileCheck %s --check-prefix=CHECK4
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# CHECK4: R_X86_64_JUMP_SLOT {{.*}} __wrap_bar + 0
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# CHECK4: Symbol table '.dynsym' contains 4 entries:
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# CHECK4: NOTYPE LOCAL DEFAULT UND
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# CHECK4-NEXT: NOTYPE GLOBAL DEFAULT UND __wrap_bar
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# CHECK4-NEXT: NOTYPE GLOBAL DEFAULT 6 _start
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# CHECK4-NEXT: NOTYPE GLOBAL DEFAULT 6 foo
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# RUN: ld.lld %t/main.o %t/wrap.so --wrap bar -o %t1
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# RUN: llvm-readelf --dyn-syms %t1 | FileCheck %s --check-prefix=DYNSYM
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# RUN: llvm-objdump -d %t1 | FileCheck %s --check-prefix=ASM
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# DYNSYM: Symbol table '.dynsym' contains 2 entries:
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# DYNSYM: NOTYPE LOCAL DEFAULT UND
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# DYNSYM-NEXT: NOTYPE GLOBAL DEFAULT UND __wrap_bar
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# ASM: <_start>:
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# ASM-NEXT: callq {{.*}} <__wrap_bar@plt>
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#--- main.s
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.globl _start, foo
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_start:
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call bar
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foo:
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#--- call-foo.s
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call foo
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#--- bar.s
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.globl bar
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bar:
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call __real_foo
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#--- wrap.s
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.globl __wrap_bar
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__wrap_bar:
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retq
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