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hanchenye-llvm-project/lld/test/ELF/verdef-defaultver.s

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[ELF] - Implemented support of default/non-default symbols versions t is possible to create new version of symbol instead of depricated one using combination of version script and asm commands. For example: __asm__(".symver b_1,b@LIBSAMPLE_1.0"); int b_1() { return 10; } __asm__(".symver b_2,b@@LIBSAMPLE_2.0"); int b_2() { return 20; } This code makes b_2() to be default implementation for b(). b_1() is used for compatibility with binaries compiled against library of older version LIBSAMPLE_1.0. This patch implements support for above functionality in lld. Differential revision: http://reviews.llvm.org/D21681 llvm-svn: 274002
2016-06-28 16:21:10 +08:00
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %p/Inputs/verdef-defaultver.s -o %t1
# RUN: echo "LIBSAMPLE_1.0{ \
# RUN: global: a; \
# RUN: local: *; }; \
# RUN: LIBSAMPLE_2.0{ \
# RUN: global: b; c; \
# RUN: }LIBSAMPLE_1.0;" > %t.script
# RUN: ld.lld -shared -soname shared %t1 --version-script %t.script -o %t.so
# RUN: llvm-readobj -V -dyn-symbols %t.so | FileCheck --check-prefix=DSO %s
# DSO: DynamicSymbols [
# DSO-NEXT: Symbol {
# DSO-NEXT: Name: @
# DSO-NEXT: Value: 0x0
# DSO-NEXT: Size: 0
# DSO-NEXT: Binding: Local
# DSO-NEXT: Type: None
# DSO-NEXT: Other: 0
# DSO-NEXT: Section: Undefined
# DSO-NEXT: }
# DSO-NEXT: Symbol {
# DSO-NEXT: Name: a@@LIBSAMPLE_1.0
# DSO-NEXT: Value: 0x1000
# DSO-NEXT: Size: 0
# DSO-NEXT: Binding: Global
# DSO-NEXT: Type: Function
# DSO-NEXT: Other: 0
# DSO-NEXT: Section: .text
# DSO-NEXT: }
# DSO-NEXT: Symbol {
# DSO-NEXT: Name: b@@LIBSAMPLE_2.0
# DSO-NEXT: Value: 0x1002
# DSO-NEXT: Size: 0
# DSO-NEXT: Binding: Global
# DSO-NEXT: Type: Function
# DSO-NEXT: Other: 0
# DSO-NEXT: Section: .text
# DSO-NEXT: }
# DSO-NEXT: Symbol {
# DSO-NEXT: Name: b@LIBSAMPLE_1.0
# DSO-NEXT: Value: 0x1001
# DSO-NEXT: Size: 0
# DSO-NEXT: Binding: Global
# DSO-NEXT: Type: Function
# DSO-NEXT: Other: 0
# DSO-NEXT: Section: .text
# DSO-NEXT: }
# DSO-NEXT: Symbol {
# DSO-NEXT: Name: c@@LIBSAMPLE_2.0
# DSO-NEXT: Value: 0x1003
# DSO-NEXT: Size: 0
# DSO-NEXT: Binding: Global
# DSO-NEXT: Type: Function
# DSO-NEXT: Other: 0
# DSO-NEXT: Section: .text
# DSO-NEXT: }
# DSO-NEXT: ]
# DSO-NEXT: Version symbols {
# DSO-NEXT: Section Name: .gnu.version
# DSO-NEXT: Address: 0x240
# DSO-NEXT: Offset: 0x240
# DSO-NEXT: Link: 1
# DSO-NEXT: Symbols [
# DSO-NEXT: Symbol {
# DSO-NEXT: Version: 0
# DSO-NEXT: Name: @
# DSO-NEXT: }
# DSO-NEXT: Symbol {
# DSO-NEXT: Version: 2
# DSO-NEXT: Name: a@@LIBSAMPLE_1.0
# DSO-NEXT: }
# DSO-NEXT: Symbol {
# DSO-NEXT: Version: 3
# DSO-NEXT: Name: b@@LIBSAMPLE_2.0
# DSO-NEXT: }
# DSO-NEXT: Symbol {
# DSO-NEXT: Version: 2
# DSO-NEXT: Name: b@LIBSAMPLE_1.0
# DSO-NEXT: }
# DSO-NEXT: Symbol {
# DSO-NEXT: Version: 3
# DSO-NEXT: Name: c@@LIBSAMPLE_2.0
# DSO-NEXT: }
# DSO-NEXT: ]
# DSO-NEXT: }
# DSO-NEXT: SHT_GNU_verdef {
# DSO-NEXT: Definition {
# DSO-NEXT: Version: 1
# DSO-NEXT: Flags: Base
# DSO-NEXT: Index: 1
# DSO-NEXT: Hash: 127830196
# DSO-NEXT: Name: shared
# DSO-NEXT: }
# DSO-NEXT: Definition {
# DSO-NEXT: Version: 1
# DSO-NEXT: Flags: 0x0
# DSO-NEXT: Index: 2
# DSO-NEXT: Hash: 98457184
# DSO-NEXT: Name: LIBSAMPLE_1.0
# DSO-NEXT: }
# DSO-NEXT: Definition {
# DSO-NEXT: Version: 1
# DSO-NEXT: Flags: 0x0
# DSO-NEXT: Index: 3
# DSO-NEXT: Hash: 98456416
# DSO-NEXT: Name: LIBSAMPLE_2.0
# DSO-NEXT: }
# DSO-NEXT: }
## Check that we can link against DSO produced.
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t2
# RUN: ld.lld %t2 %t.so -o %t3
# RUN: llvm-readobj -V -dyn-symbols %t3 | FileCheck --check-prefix=EXE %s
# EXE: DynamicSymbols [
# EXE-NEXT: Symbol {
# EXE-NEXT: Name: @
# EXE-NEXT: Value: 0x0
# EXE-NEXT: Size: 0
# EXE-NEXT: Binding: Local
# EXE-NEXT: Type: None
# EXE-NEXT: Other: 0
# EXE-NEXT: Section: Undefined
# EXE-NEXT: }
# EXE-NEXT: Symbol {
# EXE-NEXT: Name: a@LIBSAMPLE_1.0
# EXE-NEXT: Value: 0x11020
# EXE-NEXT: Size: 0
# EXE-NEXT: Binding: Global
# EXE-NEXT: Type: Function
# EXE-NEXT: Other: 0
# EXE-NEXT: Section: Undefined
# EXE-NEXT: }
# EXE-NEXT: Symbol {
# EXE-NEXT: Name: b@LIBSAMPLE_2.0
# EXE-NEXT: Value: 0x11030
# EXE-NEXT: Size: 0
# EXE-NEXT: Binding: Global
# EXE-NEXT: Type: Function
# EXE-NEXT: Other: 0
# EXE-NEXT: Section: Undefined
# EXE-NEXT: }
# EXE-NEXT: Symbol {
# EXE-NEXT: Name: c@LIBSAMPLE_2.0
# EXE-NEXT: Value: 0x11040
# EXE-NEXT: Size: 0
# EXE-NEXT: Binding: Global
# EXE-NEXT: Type: Function
# EXE-NEXT: Other: 0
# EXE-NEXT: Section: Undefined
# EXE-NEXT: }
# EXE-NEXT: ]
# EXE-NEXT: Version symbols {
# EXE-NEXT: Section Name: .gnu.version
# EXE-NEXT: Address: 0x10228
# EXE-NEXT: Offset: 0x228
# EXE-NEXT: Link: 1
# EXE-NEXT: Symbols [
# EXE-NEXT: Symbol {
# EXE-NEXT: Version: 0
# EXE-NEXT: Name: @
# EXE-NEXT: }
# EXE-NEXT: Symbol {
# EXE-NEXT: Version: 2
# EXE-NEXT: Name: a@LIBSAMPLE_1.0
# EXE-NEXT: }
# EXE-NEXT: Symbol {
# EXE-NEXT: Version: 3
# EXE-NEXT: Name: b@LIBSAMPLE_2.0
# EXE-NEXT: }
# EXE-NEXT: Symbol {
# EXE-NEXT: Version: 3
# EXE-NEXT: Name: c@LIBSAMPLE_2.0
# EXE-NEXT: }
# EXE-NEXT: ]
# EXE-NEXT: }
# EXE-NEXT: SHT_GNU_verdef {
# EXE-NEXT: }
# EXE-NEXT: SHT_GNU_verneed {
# EXE-NEXT: Dependency {
# EXE-NEXT: Version: 1
# EXE-NEXT: Count: 2
# EXE-NEXT: FileName: shared
# EXE-NEXT: Entry {
# EXE-NEXT: Hash: 98457184
# EXE-NEXT: Flags: 0x0
# EXE-NEXT: Index: 2
# EXE-NEXT: Name: LIBSAMPLE_1.0
# EXE-NEXT: }
# EXE-NEXT: Entry {
# EXE-NEXT: Hash: 98456416
# EXE-NEXT: Flags: 0x0
# EXE-NEXT: Index: 3
# EXE-NEXT: Name: LIBSAMPLE_2.0
# EXE-NEXT: }
# EXE-NEXT: }
# EXE-NEXT: }
.globl _start
_start:
callq a
callq b
callq c