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llvm-project/lld/test/ELF/linkerscript/sections-gc2.s

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Make gc a bit more aggressive. We were not gcing any section whose name was a C identifier. Both gold and bfd only keep those if they are used. To avoid having to create the __start/__stop symbols early or doing string lookups in resolvedReloc, this patch just looks for undefined symbols __start/__stop to decide if a section is needed or not. llvm-svn: 296723
2017-03-02 09:50:34 +08:00
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
# RUN: echo "SECTIONS { \
# RUN: used_in_reloc : { *(used_in_reloc) } \
# RUN: used_in_script : { *(used_in_script) } \
Simplify test by producing an executable. llvm-svn: 296786
2017-03-03 03:19:59 +08:00
# RUN: .text : { *(.text) } \
Make gc a bit more aggressive. We were not gcing any section whose name was a C identifier. Both gold and bfd only keep those if they are used. To avoid having to create the __start/__stop symbols early or doing string lookups in resolvedReloc, this patch just looks for undefined symbols __start/__stop to decide if a section is needed or not. llvm-svn: 296723
2017-03-02 09:50:34 +08:00
# RUN: }" > %t.script
Simplify test by producing an executable. llvm-svn: 296786
2017-03-03 03:19:59 +08:00
# RUN: ld.lld -T %t.script -o %t.so %t.o --gc-sections
Make gc a bit more aggressive. We were not gcing any section whose name was a C identifier. Both gold and bfd only keep those if they are used. To avoid having to create the __start/__stop symbols early or doing string lookups in resolvedReloc, this patch just looks for undefined symbols __start/__stop to decide if a section is needed or not. llvm-svn: 296723
2017-03-02 09:50:34 +08:00
# RUN: llvm-objdump -h %t.so | FileCheck %s
# CHECK: Idx Name Size Address Type
# CHECK-NEXT: 0
# CHECK-NEXT: used_in_reloc
Simplify test by producing an executable. llvm-svn: 296786
2017-03-03 03:19:59 +08:00
# CHECK-NEXT: .text
Make gc a bit more aggressive. We were not gcing any section whose name was a C identifier. Both gold and bfd only keep those if they are used. To avoid having to create the __start/__stop symbols early or doing string lookups in resolvedReloc, this patch just looks for undefined symbols __start/__stop to decide if a section is needed or not. llvm-svn: 296723
2017-03-02 09:50:34 +08:00
# CHECK-NEXT: .comment
# CHECK-NEXT: .symtab
# CHECK-NEXT: .shstrtab
# CHECK-NEXT: .strtab
Simplify test by producing an executable. llvm-svn: 296786
2017-03-03 03:19:59 +08:00
.global _start
_start:
Make gc a bit more aggressive. We were not gcing any section whose name was a C identifier. Both gold and bfd only keep those if they are used. To avoid having to create the __start/__stop symbols early or doing string lookups in resolvedReloc, this patch just looks for undefined symbols __start/__stop to decide if a section is needed or not. llvm-svn: 296723
2017-03-02 09:50:34 +08:00
.quad __start_used_in_reloc
.section unused,"a"
.quad 0
.section used_in_script,"a"
Fully precise gc handling of __start and __stop symbols. This puts us at parity with bfd, which could already gc this case. I noticed the sections not being gced when linking a modified freebsd kernel. A section that was not gced and not mentioned in the linker script would end up breaking the expected layout. Since fixing the gc is relatively simple and an improvement, that seems better than trying to hack the orphan placement code. There are 173 input section in the entire link whose names are valid C identifiers, so this is probably not too performance critical. llvm-svn: 297049
2017-03-07 02:48:18 +08:00
.quad __start_used_in_script
Make gc a bit more aggressive. We were not gcing any section whose name was a C identifier. Both gold and bfd only keep those if they are used. To avoid having to create the __start/__stop symbols early or doing string lookups in resolvedReloc, this patch just looks for undefined symbols __start/__stop to decide if a section is needed or not. llvm-svn: 296723
2017-03-02 09:50:34 +08:00
.section used_in_reloc,"a"
.quad 0