; REQUIRES: x86-registered-target

; Test devirtualization through the thin link and backend.

; Generate split module with summary for hybrid Thin/Regular LTO WPD.
; RUN: opt -thinlto-bc -thinlto-split-lto-unit -o %t.o %s

; Check that we have module flag showing splitting enabled, and that we don't
; generate summary information needed for index-based WPD.
; RUN: llvm-modextract -b -n=0 %t.o -o %t.o.0
; RUN: llvm-dis -o - %t.o.0 | FileCheck %s --check-prefix=ENABLESPLITFLAG --implicit-check-not=vTableFuncs --implicit-check-not=typeidCompatibleVTable
; RUN: llvm-modextract -b -n=1 %t.o -o %t.o.1
; RUN: llvm-dis -o - %t.o.1 | FileCheck %s --check-prefix=ENABLESPLITFLAG --implicit-check-not=vTableFuncs --implicit-check-not=typeidCompatibleVTable
; ENABLESPLITFLAG: !{i32 1, !"EnableSplitLTOUnit", i32 1}

; Generate unsplit module with summary for ThinLTO index-based WPD.
; RUN: opt -thinlto-bc -o %t2.o %s

; Check that we don't have module flag when splitting not enabled for ThinLTO,
; and that we generate summary information needed for index-based WPD.
; RUN: llvm-dis -o - %t2.o | FileCheck %s --check-prefix=NOENABLESPLITFLAG
; NOENABLESPLITFLAG-DAG: !{i32 1, !"EnableSplitLTOUnit", i32 0}
; NOENABLESPLITFLAG-DAG: [[An:\^[0-9]+]] = gv: (name: "_ZN1A1nEi"
; NOENABLESPLITFLAG-DAG: [[Bf:\^[0-9]+]] = gv: (name: "_ZN1B1fEi"
; NOENABLESPLITFLAG-DAG: [[Cf:\^[0-9]+]] = gv: (name: "_ZN1C1fEi"
; NOENABLESPLITFLAG-DAG: [[Dm:\^[0-9]+]] = gv: (name: "_ZN1D1mEi"
; NOENABLESPLITFLAG-DAG: [[B:\^[0-9]+]] = gv: (name: "_ZTV1B", {{.*}} vTableFuncs: ((virtFunc: [[Bf]], offset: 16), (virtFunc: [[An]], offset: 24)), refs: ([[Bf]], [[An]])
; NOENABLESPLITFLAG-DAG: [[C:\^[0-9]+]] = gv: (name: "_ZTV1C", {{.*}} vTableFuncs: ((virtFunc: [[Cf]], offset: 16), (virtFunc: [[An]], offset: 24)), refs: ([[An]], [[Cf]])
; NOENABLESPLITFLAG-DAG: [[D:\^[0-9]+]] = gv: (name: "_ZTV1D", {{.*}} vTableFuncs: ((virtFunc: [[Dm]], offset: 16)), refs: ([[Dm]])
; NOENABLESPLITFLAG-DAG: typeidCompatibleVTable: (name: "_ZTS1A", summary: ((offset: 16, [[B]]), (offset: 16, [[C]])))
; NOENABLESPLITFLAG-DAG: typeidCompatibleVTable: (name: "_ZTS1B", summary: ((offset: 16, [[B]])))
; NOENABLESPLITFLAG-DAG: typeidCompatibleVTable: (name: "_ZTS1C", summary: ((offset: 16, [[C]])))
; Type Id on _ZTV1D should have been promoted
; NOENABLESPLITFLAG-DAG: typeidCompatibleVTable: (name: "1.{{.*}}", summary: ((offset: 16, [[D]])))

; Index based WPD
; RUN: llvm-lto2 run %t2.o -save-temps -pass-remarks=. \
; RUN:   -whole-program-visibility \
; RUN:   -o %t3 \
; RUN:   -r=%t2.o,test,px \
; RUN:   -r=%t2.o,_ZN1A1nEi,p \
; RUN:   -r=%t2.o,_ZN1B1fEi,p \
; RUN:   -r=%t2.o,_ZN1C1fEi,p \
; RUN:   -r=%t2.o,_ZN1D1mEi,p \
; RUN:   -r=%t2.o,_ZTV1B,px \
; RUN:   -r=%t2.o,_ZTV1C,px \
; RUN:   -r=%t2.o,_ZTV1D,px 2>&1 | FileCheck %s --check-prefix=REMARK
; RUN: llvm-dis %t3.1.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR

; Check that we're able to prevent specific function from being
; devirtualized when running index based WPD.
; RUN: llvm-lto2 run %t2.o -save-temps -pass-remarks=. \
; RUN:   -whole-program-visibility \
; RUN:   -wholeprogramdevirt-skip=_ZN1A1nEi \
; RUN:   -o %t3 \
; RUN:   -r=%t2.o,test,px \
; RUN:   -r=%t2.o,_ZN1A1nEi,p \
; RUN:   -r=%t2.o,_ZN1B1fEi,p \
; RUN:   -r=%t2.o,_ZN1C1fEi,p \
; RUN:   -r=%t2.o,_ZN1D1mEi,p \
; RUN:   -r=%t2.o,_ZTV1B,px \
; RUN:   -r=%t2.o,_ZTV1C,px \
; RUN:   -r=%t2.o,_ZTV1D,px 2>&1 | FileCheck %s --check-prefix=SKIP

; RUN: llvm-lto2 run %t.o -save-temps -pass-remarks=. \
; RUN:   -whole-program-visibility \
; RUN:   -o %t3 \
; RUN:   -r=%t.o,test,px \
; RUN:   -r=%t.o,_ZN1A1nEi,p \
; RUN:   -r=%t.o,_ZN1B1fEi,p \
; RUN:   -r=%t.o,_ZN1C1fEi,p \
; RUN:   -r=%t.o,_ZN1D1mEi,p \
; RUN:   -r=%t.o,_ZTV1B, \
; RUN:   -r=%t.o,_ZTV1C, \
; RUN:   -r=%t.o,_ZTV1D, \
; RUN:   -r=%t.o,_ZN1A1nEi, \
; RUN:   -r=%t.o,_ZN1B1fEi, \
; RUN:   -r=%t.o,_ZN1C1fEi, \
; RUN:   -r=%t.o,_ZN1D1mEi, \
; RUN:   -r=%t.o,_ZTV1B,px \
; RUN:   -r=%t.o,_ZTV1C,px \
; RUN:   -r=%t.o,_ZTV1D,px 2>&1 | FileCheck %s --check-prefix=REMARK --dump-input=fail
; RUN: llvm-dis %t3.1.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR

; REMARK-DAG: single-impl: devirtualized a call to _ZN1A1nEi
; REMARK-DAG: single-impl: devirtualized a call to _ZN1D1mEi

; SKIP-NOT: devirtualized a call to _ZN1A1nEi

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-grtev4-linux-gnu"

%struct.A = type { ptr }
%struct.B = type { %struct.A }
%struct.C = type { %struct.A }
%struct.D = type { ptr }

@_ZTV1B = constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr undef, ptr @_ZN1B1fEi, ptr @_ZN1A1nEi] }, !type !0, !type !1
@_ZTV1C = constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr undef, ptr @_ZN1C1fEi, ptr @_ZN1A1nEi] }, !type !0, !type !2
@_ZTV1D = constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr undef, ptr @_ZN1D1mEi] }, !type !3


; CHECK-IR-LABEL: define {{(noundef )?}}i32 @test
define i32 @test(ptr %obj, ptr %obj2, i32 %a) {
entry:
  %vtable = load ptr, ptr %obj
  %p = call i1 @llvm.type.test(ptr %vtable, metadata !"_ZTS1A")
  call void @llvm.assume(i1 %p)
  %fptrptr = getelementptr ptr, ptr %vtable, i32 1
  %fptr1 = load ptr, ptr %fptrptr, align 8

  ; Check that the call was devirtualized.
  ; CHECK-IR: %call = tail call i32 @_ZN1A1nEi
  ; Ensure !prof and !callees metadata for indirect call promotion removed.
  ; CHECK-IR-NOT: prof
  ; CHECK-IR-NOT: callees
  %call = tail call i32 %fptr1(ptr nonnull %obj, i32 %a), !prof !5, !callees !6

  %fptr22 = load ptr, ptr %vtable, align 8

  ; We still have to call it as virtual.
  ; CHECK-IR: %call3 = tail call i32 %fptr22
  %call3 = tail call i32 %fptr22(ptr nonnull %obj, i32 %call)

  %vtable2 = load ptr, ptr %obj2
  %p2 = call i1 @llvm.type.test(ptr %vtable2, metadata !4)
  call void @llvm.assume(i1 %p2)

  %fptr33 = load ptr, ptr %vtable2, align 8

  ; Check that the call was devirtualized.
  ; CHECK-IR: %call4 = tail call i32 @_ZN1D1mEi
  %call4 = tail call i32 %fptr33(ptr nonnull %obj2, i32 %call3)
  ret i32 %call4
}
; CHECK-IR-LABEL: ret i32
; CHECK-IR-LABEL: }

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

define i32 @_ZN1B1fEi(ptr %this, i32 %a) #0 {
   ret i32 0;
}

define i32 @_ZN1A1nEi(ptr %this, i32 %a) #0 {
   ret i32 0;
}

define i32 @_ZN1C1fEi(ptr %this, i32 %a) #0 {
   ret i32 0;
}

define i32 @_ZN1D1mEi(ptr %this, i32 %a) #0 {
   ret i32 0;
}

; Make sure we don't inline or otherwise optimize out the direct calls.
attributes #0 = { noinline optnone }

!0 = !{i64 16, !"_ZTS1A"}
!1 = !{i64 16, !"_ZTS1B"}
!2 = !{i64 16, !"_ZTS1C"}
!3 = !{i64 16, !4}
!4 = distinct !{}
!5 = !{!"VP", i32 0, i64 1, i64 1621563287929432257, i64 1}
!6 = !{ptr @_ZN1A1nEi}