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llvm-project/llvm/test/LTO/Resolution/X86/comdat-mixed-lto.ll

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[LTO] Remove values from non-prevailing comdats Summary: When linking a regular LTO module, if it has any non-prevailing values (dropped to available_externally) in comdats, we need to do more than just remove those values from their comdat. We also remove all values from that comdat, so as to avoid leaving an incomplete comdat. This is necessary in case we are compiling in mixed regular and ThinLTO mode, since the resulting regularLTO native object is always linked into the final binary first. We need to prevent the linker from selecting an incomplete comdat that was not the prevailing copy. Fixes PR32980. Reviewers: pcc, rafael Subscribers: mehdi_amini, david2050, llvm-commits, inglorion Differential Revision: https://reviews.llvm.org/D34803 llvm-svn: 306826
2017-06-30 22:03:24 +08:00
; Test of comdat handling with mixed thinlto and regular lto compilation.
; This module is compiled with ThinLTO
; RUN: opt -module-summary -o %t1.o %s
; Input module compiled for regular LTO
; RUN: opt -o %t2.o %p/Inputs/comdat-mixed-lto.ll
; The copy of C from this module is prevailing. The copy of C from the
; regular LTO module is not prevailing, and will be dropped to
; available_externally.
; RUN: llvm-lto2 run -r=%t1.o,C,pl -r=%t2.o,C,l -r=%t2.o,testglobfunc,lxp -r=%t1.o,testglobfunc,lx -o %t3 %t1.o %t2.o -save-temps
; The Input module (regular LTO) is %t3.0. Check to make sure that we removed
; __cxx_global_var_init and testglobfunc from comdat. Also check to ensure
; that testglobfunc was dropped to available_externally. Otherwise we would
; have linker multiply defined errors as it is no longer in a comdat and
; would clash with the copy from this module.
; RUN: llvm-dis %t3.0.0.preopt.bc -o - | FileCheck %s
; CHECK: define internal void @__cxx_global_var_init() section ".text.startup" {
[LTO][ThinLTO] Use the linker resolutions to mark global values as dso_local. Now that we have a way to mark GlobalValues as local we can use the symbol resolutions that the linker plugin provides as part of lto/thinlto link step to refine the compilers view on what symbols will end up being local. Originally commited as r317374, but reverted in r317395 to update some missed tests. Differential Revision: https://reviews.llvm.org/D35702 llvm-svn: 317408
2017-11-05 01:04:39 +08:00
; CHECK: define available_externally dso_local void @testglobfunc() section ".text.startup" {
[LTO] Remove values from non-prevailing comdats Summary: When linking a regular LTO module, if it has any non-prevailing values (dropped to available_externally) in comdats, we need to do more than just remove those values from their comdat. We also remove all values from that comdat, so as to avoid leaving an incomplete comdat. This is necessary in case we are compiling in mixed regular and ThinLTO mode, since the resulting regularLTO native object is always linked into the final binary first. We need to prevent the linker from selecting an incomplete comdat that was not the prevailing copy. Fixes PR32980. Reviewers: pcc, rafael Subscribers: mehdi_amini, david2050, llvm-commits, inglorion Differential Revision: https://reviews.llvm.org/D34803 llvm-svn: 306826
2017-06-30 22:03:24 +08:00
; ModuleID = 'comdat-mixed-lto.o'
source_filename = "comdat-mixed-lto.cpp"
Revert "Change the X86 datalayout to add three address spaces for 32 bit signed," This reverts commit r370083 because it caused check-lld failures on sanitizer-x86_64-linux-fast. llvm-svn: 370142
2019-08-28 09:08:54 +08:00
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
[LTO] Remove values from non-prevailing comdats Summary: When linking a regular LTO module, if it has any non-prevailing values (dropped to available_externally) in comdats, we need to do more than just remove those values from their comdat. We also remove all values from that comdat, so as to avoid leaving an incomplete comdat. This is necessary in case we are compiling in mixed regular and ThinLTO mode, since the resulting regularLTO native object is always linked into the final binary first. We need to prevent the linker from selecting an incomplete comdat that was not the prevailing copy. Fixes PR32980. Reviewers: pcc, rafael Subscribers: mehdi_amini, david2050, llvm-commits, inglorion Differential Revision: https://reviews.llvm.org/D34803 llvm-svn: 306826
2017-06-30 22:03:24 +08:00
target triple = "x86_64-unknown-linux-gnu"
%"class.Test::ptr" = type { i32 }
$C = comdat any
@C = linkonce_odr global %"class.Test::ptr" zeroinitializer, comdat, align 4
@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @__cxx_global_var_init, i8* bitcast (%"class.Test::ptr"* @C to i8*) }]
define void @testglobfunc() #1 section ".text.startup" comdat($C) {
entry:
ret void
}
; Function Attrs: noinline uwtable
define internal void @__cxx_global_var_init() #1 section ".text.startup" comdat($C) {
entry:
ret void
}