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llvm-project/lld/test/MachO/weak-definition-gc.s

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# REQUIRES: x86
# RUN: rm -rf %t; split-file %s %t
## This tests that if two input files define the same weak symbol, we only
## write it to the output once (...assuming both input files use
## .subsections_via_symbols).
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/weak-sub.s -o %t/weak-sub.o
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/weak-nosub.s -o %t/weak-nosub.o
## Test that weak symbols are emitted just once with .subsections_via_symbols
# RUN: %lld -dylib -o %t/out.dylib %t/weak-sub.o %t/weak-sub.o
# RUN: llvm-otool -jtV %t/out.dylib | FileCheck --check-prefix=SUB %s
# RUN: %lld -dylib -o %t/out.dylib %t/weak-nosub.o %t/weak-sub.o
# RUN: llvm-otool -jtV %t/out.dylib | FileCheck --check-prefix=SUB %s
# RUN: %lld -dylib -o %t/out.dylib %t/weak-sub.o %t/weak-nosub.o
# RUN: llvm-otool -jtV %t/out.dylib | FileCheck --check-prefix=SUB %s
# SUB: _foo
# SUB-NEXT: retq
# SUB-NOT: retq
# SUB: _bar
# SUB-NEXT: retq
# SUB-NOT: retq
## We can even strip weak symbols without subsections_via_symbols as long
## as none of the weak symbols in a section are needed.
# RUN: %lld -dylib -o %t/out.dylib %t/weak-nosub.o %t/weak-nosub.o
# RUN: llvm-otool -jtV %t/out.dylib | FileCheck --check-prefix=SUB %s
## Test that omitted weak symbols don't add entries to the compact unwind table.
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin19.0.0 %t/weak-sub-lsda.s -o %t/weak-sub-lsda.o
# RUN: %lld -dylib -lc++ -o %t/out.dylib %t/weak-sub-lsda.o %t/weak-sub-lsda.o
# RUN: llvm-objdump --macho --unwind-info --syms %t/out.dylib | FileCheck %s --check-prefix=ONE-UNWIND
# RUN: %lld -dylib -lc++ -o %t/out.dylib %t/weak-sub.o %t/weak-sub-lsda.o
# RUN: llvm-objdump --macho --unwind-info --syms %t/out.dylib | FileCheck %s --check-prefix=NO-UNWIND
# RUN: yaml2obj %t/weak-sub-lsda-r.yaml -o %t/weak-sub-lsda-r.o
# RUN: %lld -dylib -lc++ -o %t/out.dylib %t/weak-sub.o %t/weak-sub-lsda-r.o
# RUN: llvm-objdump --macho --unwind-info --syms %t/out.dylib | FileCheck %s --check-prefix=NO-UNWIND
# ONE-UNWIND: SYMBOL TABLE:
# ONE-UNWIND-DAG: [[#%x,FOO:]] w F __TEXT,__text _foo
# ONE-UNWIND-NOT: __TEXT,__text _foo
# ONE-UNWIND: Contents of __unwind_info section:
# ONE-UNWIND: LSDA descriptors:
# ONE-UNWIND: [0]: function offset=0x[[#%.8x,FOO]]
# ONE-UNWIND-NOT: [1]:
# ONE-UNWIND: Second level indices:
# ONE-UNWIND-DAG: [0]: function offset=0x[[#%.8x,FOO]]
# ONE-UNWIND-NOT: [1]:
# NO-UNWIND: SYMBOL TABLE:
# NO-UNWIND-DAG: [[#%x,FOO:]] w F __TEXT,__text _foo
# NO-UNWIND-NOT: __TEXT,__text _foo
# NO-UNWIND-NOT: Contents of __unwind_info section:
## Test interaction with .alt_entry
## FIXME: ld64 manages to strip both one copy of _foo and _bar each.
## We only manage this if we're lucky and the object files are in
## the right order. We're happy to not crash at link time for now.
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin19.0.0 %t/weak-sub-alt.s -o %t/weak-sub-alt.o
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin19.0.0 %t/weak-sub-alt2.s -o %t/weak-sub-alt2.o
# RUN: %lld -dylib -o %t/out.dylib %t/weak-sub-alt.o %t/weak-sub-alt2.o
# RUN: %lld -dylib -o %t/out.dylib %t/weak-sub-alt2.o %t/weak-sub-alt.o
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin19.0.0 %t/weak-aligned-1.s -o %t/weak-aligned-1.o
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin19.0.0 %t/weak-aligned-2.s -o %t/weak-aligned-2.o
# RUN: %lld -o %t/out -lSystem %t/weak-aligned-1.o %t/weak-aligned-2.o
# RUN: llvm-objdump --syms --section=__const --full-contents %t/out | FileCheck --check-prefix=ALIGN %s
# ALIGN: SYMBOL TABLE:
# ALIGN-DAG: [[#%x, ADDR:]] l O __DATA_CONST,__const _weak1
# ALIGN-DAG: {{0*}}[[#ADDR+ 0x4]] l O __DATA_CONST,__const _weak3
# ALIGN-DAG: {{0*}}[[#ADDR+ 0x8]] l O __DATA_CONST,__const _weak2
# ALIGN-DAG: {{0*}}[[#ADDR+0x10]] g O __DATA_CONST,__const _aligned
# ALIGN: Contents of section __DATA_CONST,__const:
# ALIGN-NEXT: {{0*}}[[#ADDR]] 11111111 33333333 22222222 00000000
# ALIGN-NEXT: {{0*}}[[#ADDR+0x10]] 81818181 81818181 82828282 82828282
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin19.0.0 %t/weak-def.s -o %t/weak-def.o
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin19.0.0 %t/strong-def.s -o %t/strong-def.o
# RUN: %lld -dylib -lc++ -o %t/weak-strong-mixed.dylib %t/weak-def.o %t/strong-def.o
# RUN: %lld -dylib -lc++ -o %t/strong-weak-mixed.dylib %t/strong-def.o %t/weak-def.o
## Check that omitted weak symbols are not adding their section and unwind stuff.
# RUN: llvm-otool -jtV %t/weak-strong-mixed.dylib | FileCheck --check-prefix=MIXED %s
# RUN: llvm-otool -jtV %t/strong-weak-mixed.dylib | FileCheck --check-prefix=MIXED %s
# MIXED: (__TEXT,__text) section
# MIXED-NEXT: _foo:
# MIXED-NEXT: {{.+}} 33 33 xorl (%rbx), %esi
# MIXED-NEXT: {{.+}} 33 33 xorl (%rbx), %esi
# MIXED-NEXT: {{.+}} c3 retq
# RUN: llvm-objdump --macho --syms --unwind-info %t/weak-strong-mixed.dylib | FileCheck --check-prefix=MIXED-UNWIND %s
# RUN: llvm-objdump --macho --syms --unwind-info %t/strong-weak-mixed.dylib | FileCheck --check-prefix=MIXED-UNWIND %s
# MIXED-UNWIND: g F __TEXT,__text _foo
# MIXED-UNWIND-NOT: Contents of __unwind_info section:
#--- weak-sub.s
.globl _foo, _bar
.weak_definition _foo, _bar
_foo:
retq
_bar:
retq
.subsections_via_symbols
#--- weak-nosub.s
.globl _foo, _bar
.weak_definition _foo, _bar
_foo:
retq
_bar:
retq
#--- weak-sub-lsda.s
.section __TEXT,__text,regular,pure_instructions
.globl _foo
.weak_definition _foo
_foo:
.cfi_startproc
.cfi_personality 155, ___gxx_personality_v0
.cfi_lsda 16, Lexception
pushq %rbp
.cfi_def_cfa_offset 128
.cfi_offset %rbp, 48
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
popq %rbp
retq
.cfi_endproc
.section __TEXT,__gcc_except_tab
Lexception:
.space 0x10
.subsections_via_symbols
#--- weak-sub-alt.s
.globl _foo, _bar
.weak_definition _foo
_foo:
retq
# Alternative entry point to _foo (strong)
.alt_entry _bar
_bar:
retq
.globl _main, _ref
_main:
callq _ref
callq _bar
.subsections_via_symbols
#--- weak-sub-alt2.s
.globl _foo, _bar
.weak_definition _foo
_foo:
retq
# Alternative entry point to _foo (weak)
.weak_definition _bar
.alt_entry _bar
_bar:
retq
.globl _ref
_ref:
callq _bar
.subsections_via_symbols
#--- weak-aligned-1.s
.section __DATA,__const
.p2align 3
.globl _weak1
.weak_def_can_be_hidden _weak1
_weak1:
.4byte 0x11111111
.globl _weak3
.weak_def_can_be_hidden _weak3
_weak3:
.4byte 0x33333333
.subsections_via_symbols
#--- weak-aligned-2.s
# _weak1 and _weak3 are already in weak-aligned-1,
# so from _weak1-3 in this file only _weak2 is used.
# However, _aligned still has to stay aligned to a 16-byte boundary.
.section __DATA,__const
.p2align 3
.globl _weak1
.weak_def_can_be_hidden _weak1
_weak1:
.4byte 0x11111111
.globl _weak2
.weak_def_can_be_hidden _weak2
_weak2:
.4byte 0x22222222
.globl _weak3
.weak_def_can_be_hidden _weak3
_weak3:
.4byte 0x33333333
.section __DATA,__const
.p2align 4
.globl _aligned
_aligned:
.8byte 0x8181818181818181
.8byte 0x8282828282828282
.section __TEXT,__text
.globl _main
_main:
movl _weak1(%rip), %eax
movl _weak2(%rip), %ebx
movaps _aligned(%rip), %xmm0
retq
.subsections_via_symbols
#--- weak-def.s
.section __TEXT,__text,regular,pure_instructions
.globl _foo
.weak_definition _foo
_foo:
.cfi_startproc
.cfi_personality 155, ___gxx_personality_v0
.cfi_lsda 16, Lexception
pushq %rbp
.cfi_def_cfa_offset 128
.cfi_offset %rbp, 48
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
popq %rbp
retq
.cfi_endproc
.section __TEXT,__gcc_except_tab
Lexception:
.space 0x10
.subsections_via_symbols
#--- strong-def.s
.globl _foo, _bar
_foo:
.4byte 0x33333333
retq
.subsections_via_symbols
#--- weak-sub-lsda-r.yaml
## This was generated from compiling weak-sub-lsda.s above at rev a2404f11c77e
## and then running it through `ld -r`. This converts a number of unwind-related
## relocations from section- to symbol-based ones.
--- !mach-o
FileHeader:
magic: 0xFEEDFACF
cputype: 0x1000007
cpusubtype: 0x3
filetype: 0x1
ncmds: 2
sizeofcmds: 464
flags: 0x2000
reserved: 0x0
LoadCommands:
- cmd: LC_SEGMENT_64
cmdsize: 392
segname: ''
vmaddr: 0
vmsize: 152
fileoff: 528
filesize: 152
maxprot: 7
initprot: 7
nsects: 3
flags: 0
Sections:
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content: '0000000000000000000000000000000000000000000000000000000000000000'
- sectname: __eh_frame
segname: __TEXT
addr: 0x28
size: 80
offset: 0x238
align: 3
reloff: 0x2A8
nreloc: 7
flags: 0x0
reserved1: 0x0
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content: 1C00000000000000017A504C5200017810079B0400000010100C0708900100002C00000004000000F8FFFFFFFFFFFFFF060000000000000008E7FFFFFFFFFFFFFF410E800111067A430D060000000000
relocations:
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symbolnum: 5
pcrel: true
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extern: true
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symbolnum: 2
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segname: __LD
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relocations:
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symbolnum: 4
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extern: true
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pcrel: false
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extern: true
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value: 0
- cmd: LC_SYMTAB
cmdsize: 24
symoff: 768
nsyms: 6
stroff: 864
strsize: 57
LinkEditData:
NameList:
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StringTable:
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- _foo
- ___gxx_personality_v0
- l001
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- EH_Frame1
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...
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