1# REQUIRES: x86 2## Test -r --gc-sections. 3 4# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o 5 6## By default all regular sections are discarded. We currently don't track 7## usage of group signature symbols and will retain them and their associated 8## STT_SECTION symbols. 9# RUN: ld.lld -r --gc-sections --print-gc-sections %t.o -o %t 10# RUN: llvm-readelf -S -s %t | FileCheck %s 11 12# CHECK: [ 1] .group 13# CHECK-NEXT: [ 2] .note.GNU-stack 14 15# CHECK: Symbol table '.symtab' contains 3 entries: 16# CHECK-NEXT: Num: 17# CHECK-NEXT: 0: 18# CHECK-NEXT: 1: {{.*}} NOTYPE LOCAL DEFAULT 1 group 19# CHECK-NEXT: 2: {{.*}} SECTION LOCAL DEFAULT 1 20 21## -u keeps .text.bar alive. Other group members are kept alive as well. 22# RUN: ld.lld -r --gc-sections -u bar %t.o -o - | llvm-readelf -Ss - | \ 23# RUN: FileCheck %s --check-prefix=KEEP_GROUP 24## -e, --init and --fini are similar. 25# RUN: ld.lld -r --gc-sections -e bar %t.o -o - | llvm-readelf -Ss - | \ 26# RUN: FileCheck %s --check-prefix=KEEP_GROUP 27# RUN: ld.lld -r --gc-sections --init=bar %t.o -o - | llvm-readelf -Ss - | \ 28# RUN: FileCheck %s --check-prefix=KEEP_GROUP 29# RUN: ld.lld -r --gc-sections --fini=bar %t.o -o - | llvm-readelf -Ss - | \ 30# RUN: FileCheck %s --check-prefix=KEEP_GROUP 31 32# KEEP_GROUP: [ 1] .group 33# KEEP_GROUP-NEXT: [ 2] .text.bar 34# KEEP_GROUP-NEXT: [ 3] .text.foo 35# KEEP_GROUP-NEXT: [ 4] .note.GNU-stack 36 37# KEEP_GROUP: Symbol table '.symtab' contains 7 entries: 38# KEEP_GROUP: 4: {{.*}} SECTION 39# KEEP_GROUP-NEXT: 5: {{.*}} 2 bar 40# KEEP_GROUP-NEXT: 6: {{.*}} 3 foo 41 42## If .text is retained, its referenced qux and .fred are retained as well. 43## fred_und is used (by .fred) and thus emitted. 44## Note, GNU ld does not retain qux. 45# RUN: ld.lld -r --gc-sections -z nostart-stop-gc -e _start %t.o -o %tstart.ro 46# RUN: llvm-readelf -Ss %tstart.ro | FileCheck %s --check-prefix=KEEP_START 47 48# KEEP_START: [ 1] .text 49# KEEP_START-NEXT: [ 2] .rela.text 50# KEEP_START-NEXT: [ 3] qux 51# KEEP_START-NEXT: [ 4] .group 52# KEEP_START-NEXT: [ 5] .fred 53# KEEP_START-NEXT: [ 6] .rela.fred 54# KEEP_START-NEXT: [ 7] .note.GNU-stack 55 56# KEEP_START: Symbol table '.symtab' contains 10 entries: 57# KEEP_START: 5: {{.*}} SECTION 58# KEEP_START-NEXT: 6: {{.*}} 1 _start 59# KEEP_START-NEXT: 7: {{.*}} 5 fred 60# KEEP_START-NEXT: 8: {{.*}} UND __start_qux 61# KEEP_START-NEXT: 9: {{.*}} UND fred_und 62 63.section qux,"a",@progbits 64 .byte 0 65 66.text 67.globl _start, bar, foo, fred 68_start: 69 call fred 70 .quad __start_qux 71 72.section .text.bar,"axG",@progbits,group,comdat 73bar: 74 .byte 1 75.section .text.foo,"axG",@progbits,group,comdat 76foo: 77 .byte 2 78.section .fred,"ax",@progbits 79fred: 80 call fred_und 81