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llvm-project/lld/test/ELF/wrap-shlib-undefined.s

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[ELF] --wrap: don't error `undefined reference to __real_foo` (--no-allow-shlib-undefined) if foo is a wrapped definition This is a regression after D51283. Also, export `foo` if `__real_foo` is referenced by a shared object.
2020-06-02 13:57:43 +08:00
# REQUIRES: x86
[ELF] --wrap: set isUsedInRegularObj of __wrap_ if it is defined or shared Fixes PR47017 (a regression when fixing PR46169): if __wrap_ is shared, it is not exported.
2020-08-09 00:24:08 +08:00
# RUN: split-file %s %t.dir
# RUN: llvm-mc -filetype=obj -triple=x86_64 %t.dir/main.s -o %t.o
[ELF] --wrap: don't error `undefined reference to __real_foo` (--no-allow-shlib-undefined) if foo is a wrapped definition This is a regression after D51283. Also, export `foo` if `__real_foo` is referenced by a shared object.
2020-06-02 13:57:43 +08:00
# RUN: echo '.globl bar; bar: call __real_foo' | llvm-mc -filetype=obj -triple=x86_64 - -o %t1.o
# RUN: ld.lld -shared -soname=t.so %t1.o -o %t.so
## --no-allow-shlib-undefined errors because __real_foo is not defined.
# RUN: not ld.lld %t.o %t.so -o /dev/null 2>&1 | FileCheck --check-prefix=ERR %s
[ELF] Append " [--no-allow-shlib-undefined]" to the corresponding diagnostics --no-allow-shlib-undefined (enabled by default when linking an executable) rejects unresolved references in shared objects. Users may be confused by the common diagnostics of unresolved symbols in object files (LLD: "undefined symbol: foo"; GNU ld/gold: "undefined reference to") Learn from GCC/clang " [-Wfoo]": append the option name to the diagnostics. Users can find relevant information by searching "--no-allow-shlib-undefined". It should also be obvious to them that the positive form --allow-shlib-undefined can suppress the error. Also downgrade the error to a warning if --noinhibit-exec is used (compatible with GNU ld and gold). Reviewed By: grimar, psmith Differential Revision: https://reviews.llvm.org/D81028
2020-06-03 22:59:28 +08:00
# ERR: {{.*}}.so: undefined reference to __real_foo [--no-allow-shlib-undefined]
[ELF] --wrap: don't error `undefined reference to __real_foo` (--no-allow-shlib-undefined) if foo is a wrapped definition This is a regression after D51283. Also, export `foo` if `__real_foo` is referenced by a shared object.
2020-06-02 13:57:43 +08:00
## --wrap=foo defines __real_foo.
# RUN: ld.lld %t.o %t.so --wrap=foo -o %t
# RUN: llvm-readelf --dyn-syms %t | FileCheck %s
## The reference __real_foo from %t.so causes foo to be exported.
[ELF] --wrap: set isUsedInRegularObj of __wrap_ only if it is defined Fixes PR46169
2020-08-02 09:19:14 +08:00
## __wrap_foo is not used, thus not exported.
# CHECK: Symbol table '.dynsym' contains 3 entries:
[ELF] --wrap: don't error `undefined reference to __real_foo` (--no-allow-shlib-undefined) if foo is a wrapped definition This is a regression after D51283. Also, export `foo` if `__real_foo` is referenced by a shared object.
2020-06-02 13:57:43 +08:00
# CHECK: NOTYPE LOCAL DEFAULT UND
# CHECK-NEXT: NOTYPE GLOBAL DEFAULT UND bar
# CHECK-NEXT: NOTYPE GLOBAL DEFAULT 6 foo
[ELF] --wrap: set isUsedInRegularObj of __wrap_ if it is defined or shared Fixes PR47017 (a regression when fixing PR46169): if __wrap_ is shared, it is not exported.
2020-08-09 00:24:08 +08:00
# RUN: llvm-mc -filetype=obj -triple=x86_64 %t.dir/wrap.s -o %twrap.o
# RUN: ld.lld -shared --soname=fixed %twrap.o -o %twrap.so
# RUN: ld.lld %t.o %twrap.so --wrap bar -o %t1
# RUN: llvm-readelf --dyn-syms %t1 | FileCheck %s --check-prefix=DYNSYM
# RUN: llvm-objdump -d %t1 | FileCheck %s --check-prefix=ASM
[ELF] --wrap: don't leave the original symbol as SHN_UNDEF in .symtab or .dynsym
2020-08-09 09:17:38 +08:00
# DYNSYM: Symbol table '.dynsym' contains 2 entries:
[ELF] --wrap: set isUsedInRegularObj of __wrap_ if it is defined or shared Fixes PR47017 (a regression when fixing PR46169): if __wrap_ is shared, it is not exported.
2020-08-09 00:24:08 +08:00
# DYNSYM: NOTYPE LOCAL DEFAULT UND
# DYNSYM-NEXT: NOTYPE GLOBAL DEFAULT UND __wrap_bar
# ASM: <_start>:
# ASM-NEXT: callq {{.*}} <__wrap_bar@plt>
#--- main.s
[ELF] --wrap: don't error `undefined reference to __real_foo` (--no-allow-shlib-undefined) if foo is a wrapped definition This is a regression after D51283. Also, export `foo` if `__real_foo` is referenced by a shared object.
2020-06-02 13:57:43 +08:00
.globl _start, foo
_start:
call bar
foo:
[ELF] --wrap: set isUsedInRegularObj of __wrap_ if it is defined or shared Fixes PR47017 (a regression when fixing PR46169): if __wrap_ is shared, it is not exported.
2020-08-09 00:24:08 +08:00
#--- wrap.s
.globl __wrap_bar
__wrap_bar:
retq