llvm/test/ThinLTO/X86/devirt_prevailing.ll

; RUN: rm -rf %t && mkdir %t && cd %t

; Tests that devirtualization is suppressed on a class when the LTO unit doesn't
; have the prevailing definition of the base class.

; Generate unsplit module with summary for ThinLTO index-based WPD.
; RUN: opt -thinlto-bc -o summary.o %s

; Index based WPD
; The callsite inside @_ZN4Base8dispatchEv gets devirtualized when symbol
; resolution shows there is a prevailing definition of `_ZTI7Derived` in the
; LTO unit.
; RUN: llvm-lto2 run summary.o -save-temps -pass-remarks=. \
; RUN:   -thinlto-threads=1 \
; RUN:   -o tmp \
; RUN:   --whole-program-visibility-enabled-in-lto=true \
; RUN:   --validate-all-vtables-have-type-infos=true \
; RUN:   --all-vtables-have-type-infos=true \
; RUN:   -r=summary.o,_ZN4Base8dispatchEv,px \
; RUN:   -r=summary.o,_ZN8DerivedN5printEv,px \
; RUN:   -r=summary.o,_ZTV8DerivedN,p \
; RUN:   -r=summary.o,_ZTI8DerivedN,p \
; RUN:   -r=summary.o,_ZTS8DerivedN,p \
; RUN:   -r=summary.o,_ZTI7Derived,p \
; RUN:   2>&1 | FileCheck --allow-empty %s --check-prefix=REMARK


; Index based WPD
; The callsite inside @_ZN4Base8dispatchEv remains indirect and not de-virtualized
; when symbol resolution shows there isn't a prevailing definition of
; `_ZTI7Derived` in the LTO unit.
; RUN: llvm-lto2  run summary.o -save-temps -pass-remarks=. \
; RUN:   -thinlto-threads=1 \
; RUN:   -o tmp \
; RUN:   --whole-program-visibility-enabled-in-lto=true \
; RUN:   --validate-all-vtables-have-type-infos=true \
; RUN:   --all-vtables-have-type-infos=true \
; RUN:   -r=summary.o,_ZN4Base8dispatchEv,px \
; RUN:   -r=summary.o,_ZN8DerivedN5printEv,px \
; RUN:   -r=summary.o,_ZTV8DerivedN,p \
; RUN:   -r=summary.o,_ZTI8DerivedN,p \
; RUN:   -r=summary.o,_ZTS8DerivedN,p \
; RUN:   -r=summary.o,_ZTI7Derived, \
; RUN:   2>&1 | FileCheck %s --allow-empty --implicit-check-not='single-impl: devirtualized a call to'

; Repeat the above tests for WPD in hybrid LTO.
; RUN: opt  --thinlto-bc --thinlto-split-lto-unit -o hybrid.o %s

; RUN: llvm-lto2 run hybrid.o -save-temps -pass-remarks=. \
; RUN:   -thinlto-threads=1 \
; RUN:   -o hybrid-tmp \
; RUN:   --whole-program-visibility-enabled-in-lto=true \
; RUN:   --validate-all-vtables-have-type-infos=true \
; RUN:   --all-vtables-have-type-infos=true \
; RUN:   -r=hybrid.o,_ZN4Base8dispatchEv,px \
; RUN:   -r=hybrid.o,_ZN8DerivedN5printEv,px \
; RUN:   -r=hybrid.o,_ZTV8DerivedN, \
; RUN:   -r=hybrid.o,_ZTI8DerivedN, \
; RUN:   -r=hybrid.o,_ZTS8DerivedN,p \
; RUN:   -r=hybrid.o,_ZTI7Derived,p \
; RUN:   -r=hybrid.o,_ZN8DerivedN5printEv, \
; RUN:   -r=hybrid.o,_ZTV8DerivedN,p \
; RUN:   -r=hybrid.o,_ZTI8DerivedN,p \
; RUN:   2>&1 | FileCheck --allow-empty %s --check-prefix=REMARK


; RUN: llvm-lto2 run hybrid.o -save-temps -pass-remarks=. \
; RUN:   -thinlto-threads=1 \
; RUN:   -o hybrid-tmp \
; RUN:   --whole-program-visibility-enabled-in-lto=true \
; RUN:   --validate-all-vtables-have-type-infos=true \
; RUN:   --all-vtables-have-type-infos=true \
; RUN:   -r=hybrid.o,_ZN4Base8dispatchEv,px \
; RUN:   -r=hybrid.o,_ZN8DerivedN5printEv,px \
; RUN:   -r=hybrid.o,_ZTV8DerivedN, \
; RUN:   -r=hybrid.o,_ZTI8DerivedN, \
; RUN:   -r=hybrid.o,_ZTS8DerivedN,p \
; RUN:   -r=hybrid.o,_ZTI7Derived, \
; RUN:   -r=hybrid.o,_ZN8DerivedN5printEv, \
; RUN:   -r=hybrid.o,_ZTV8DerivedN,p \
; RUN:   -r=hybrid.o,_ZTI8DerivedN,p \
; RUN:   2>&1 | FileCheck --allow-empty %s --implicit-check-not='single-impl: devirtualized a call to'


; Repeat the above tests for WPD in regular LTO.
; RUN: opt  -module-summary -o regular.o %s

; RUN: llvm-lto2 run regular.o -save-temps -pass-remarks=. \
; RUN:   -thinlto-threads=1 \
; RUN:   -o regular-temp \
; RUN:   --whole-program-visibility-enabled-in-lto=true \
; RUN:   --validate-all-vtables-have-type-infos=true \
; RUN:   --all-vtables-have-type-infos=true \
; RUN:   -r=regular.o,_ZN4Base8dispatchEv,px \
; RUN:   -r=regular.o,_ZN8DerivedN5printEv,px \
; RUN:   -r=regular.o,_ZTS8DerivedN,p \
; RUN:   -r=regular.o,_ZTI7Derived,p \
; RUN:   -r=regular.o,_ZTV8DerivedN,p \
; RUN:   -r=regular.o,_ZTI8DerivedN,p \
; RUN:   2>&1 | FileCheck --allow-empty %s --check-prefix=REMARK

; RUN: llvm-lto2 run regular.o -save-temps -pass-remarks=. \
; RUN:   -thinlto-threads=1 \
; RUN:   -o regular-temp \
; RUN:   --whole-program-visibility-enabled-in-lto=true \
; RUN:   --validate-all-vtables-have-type-infos=true \
; RUN:   --all-vtables-have-type-infos=true \
; RUN:   -r=regular.o,_ZN4Base8dispatchEv,px \
; RUN:   -r=regular.o,_ZN8DerivedN5printEv,px \
; RUN:   -r=regular.o,_ZTS8DerivedN,p \
; RUN:   -r=regular.o,_ZTI7Derived, \
; RUN:   -r=regular.o,_ZTV8DerivedN,p \
; RUN:   -r=regular.o,_ZTI8DerivedN,p \
; RUN:   2>&1 | FileCheck --allow-empty %s --implicit-check-not='single-impl: devirtualized a call to'

; REMARK: single-impl: devirtualized a call to _ZN8DerivedN5printEv

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@_ZTV8DerivedN = linkonce_odr hidden constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr @_ZTI8DerivedN, ptr @_ZN8DerivedN5printEv] }, !type !0, !type !1, !type !2, !type !3, !vcall_visibility !4
@_ZTI8DerivedN = linkonce_odr hidden constant { ptr, ptr, ptr } { ptr null, ptr @_ZTS8DerivedN, ptr @_ZTI7Derived }
@_ZTS8DerivedN = linkonce_odr hidden constant [10 x i8] c"8DerivedN\00", align 1
@_ZTI7Derived = external constant ptr

; Whole program devirtualization will ignore summaries that are not live.
; Mark '_ZTV8DerivedN' as used so it remains live.
@llvm.used = appending global [1 x ptr] [ptr @_ZTV8DerivedN], section "llvm.metadata"

define hidden void @_ZN4Base8dispatchEv(ptr %this) {
entry:
  %this.addr = alloca ptr
  store ptr %this, ptr %this.addr
  %this1 = load ptr, ptr %this.addr
  %vtable = load ptr, ptr %this1
  %0 = call i1 @llvm.type.test(ptr %vtable, metadata !"_ZTS7Derived")
  call void @llvm.assume(i1 %0)
  %vfn = getelementptr inbounds ptr, ptr %vtable, i64 0
  %1 = load ptr, ptr %vfn
  call void %1(ptr %this1)
  ret void
}

define linkonce_odr hidden void @_ZN8DerivedN5printEv(ptr %this) #0 {
entry:
  ret void
}

attributes #0 = { noinline optnone }

declare i1 @llvm.type.test(ptr, metadata)
declare void @llvm.assume(i1)

!0 = !{i64 16, !"_ZTS7Derived"}
!1 = !{i64 16, !"_ZTSM7DerivedFvvE.virtual"}
!2 = !{i64 16, !"_ZTS8DerivedN"}
!3 = !{i64 16, !"_ZTSM8DerivedNFvvE.virtual"}
!4 = !{i64 0}