1; REQUIRES: x86
2;; Test that that a vtable defined locally in one module but external in another
3;; does not prevent devirtualization.
4
5;; Hybrid WPD
6; RUN: split-file %s %t
7; RUN: opt --thinlto-bc --thinlto-split-lto-unit -o %t/Cat.o %t/Cat.ll
8; RUN: opt --thinlto-bc --thinlto-split-lto-unit -o %t/User.o %t/User.ll
9; RUN: echo '{ global: _Z17useDoThingWithCatv; local: *; };' > %t/version.exp
10
11; RUN: ld.lld %t/Cat.o %t/User.o -shared -o %t/libA.so -save-temps --lto-whole-program-visibility \
12; RUN:   -mllvm -pass-remarks=. --version-script %t/version.exp 2>&1 | \
13; RUN:   FileCheck %s --check-prefix=REMARK
14
15; REMARK-DAG: <unknown>:0:0: single-impl: devirtualized a call to _ZNK3Cat9makeNoiseEv
16; REMARK-DAG: <unknown>:0:0: single-impl: devirtualized a call to _ZNK3Cat9makeNoiseEv
17
18target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
19target triple = "x86_64-unknown-linux-gnu"
20
21;--- Cat.ll
22target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
23target triple = "x86_64-unknown-linux-gnu"
24
25%struct.Cat = type { %struct.Animal }
26%struct.Animal = type { i32 (...)** }
27
28$_ZTS6Animal = comdat any
29
30$_ZTI6Animal = comdat any
31
32@.str = private unnamed_addr constant [5 x i8] c"Meow\00", align 1
33@_ZTV3Cat = dso_local unnamed_addr constant { [3 x i8*] } { [3 x i8*] [i8* null, i8* bitcast ({ i8*, i8*, i8* }* @_ZTI3Cat to i8*), i8* bitcast (void (%struct.Cat*)* @_ZNK3Cat9makeNoiseEv to i8*)] }, align 8, !type !0, !type !1, !type !2, !type !3
34@_ZTVN10__cxxabiv120__si_class_type_infoE = external dso_local global i8*
35@_ZTS3Cat = dso_local constant [5 x i8] c"3Cat\00", align 1
36@_ZTVN10__cxxabiv117__class_type_infoE = external dso_local global i8*
37@_ZTS6Animal = linkonce_odr dso_local constant [8 x i8] c"6Animal\00", comdat, align 1
38@_ZTI6Animal = linkonce_odr dso_local constant { i8*, i8* } { i8* bitcast (i8** getelementptr inbounds (i8*, i8** @_ZTVN10__cxxabiv117__class_type_infoE, i64 2) to i8*), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @_ZTS6Animal, i32 0, i32 0) }, comdat, align 8
39@_ZTI3Cat = dso_local constant { i8*, i8*, i8* } { i8* bitcast (i8** getelementptr inbounds (i8*, i8** @_ZTVN10__cxxabiv120__si_class_type_infoE, i64 2) to i8*), i8* getelementptr inbounds ([5 x i8], [5 x i8]* @_ZTS3Cat, i32 0, i32 0), i8* bitcast ({ i8*, i8* }* @_ZTI6Animal to i8*) }, align 8
40
41define dso_local void @_ZNK3Cat9makeNoiseEv(%struct.Cat* nocapture nonnull readnone dereferenceable(8) %this) unnamed_addr align 2 {
42entry:
43  %call = tail call i32 @puts(i8* nonnull dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
44  ret void
45}
46
47declare dso_local noundef i32 @puts(i8* nocapture noundef readonly) local_unnamed_addr
48
49define dso_local void @_Z14doThingWithCatP6Animal(%struct.Animal* %a) local_unnamed_addr {
50entry:
51  %tobool.not = icmp eq %struct.Animal* %a, null
52  br i1 %tobool.not, label %if.end, label %if.then
53
54if.then:                                          ; preds = %entry
55  %0 = bitcast %struct.Animal* %a to %struct.Cat*
56  %1 = bitcast %struct.Animal* %a to void (%struct.Cat*)***
57  %vtable = load void (%struct.Cat*)**, void (%struct.Cat*)*** %1, align 8, !tbaa !4
58  %2 = bitcast void (%struct.Cat*)** %vtable to i8*
59  %3 = tail call i1 @llvm.type.test(i8* %2, metadata !"_ZTS3Cat")
60  tail call void @llvm.assume(i1 %3)
61  %4 = load void (%struct.Cat*)*, void (%struct.Cat*)** %vtable, align 8
62  tail call void %4(%struct.Cat* nonnull dereferenceable(8) %0)
63  br label %if.end
64
65if.end:                                           ; preds = %if.then, %entry
66  ret void
67}
68
69declare i1 @llvm.type.test(i8*, metadata)
70
71declare void @llvm.assume(i1 noundef)
72
73!0 = !{i64 16, !"_ZTS3Cat"}
74!1 = !{i64 16, !"_ZTSM3CatKFvvE.virtual"}
75!2 = !{i64 16, !"_ZTS6Animal"}
76!3 = !{i64 16, !"_ZTSM6AnimalKFvvE.virtual"}
77!4 = !{!5, !5, i64 0}
78!5 = !{!"vtable pointer", !6, i64 0}
79!6 = !{!"Simple C++ TBAA"}
80
81;--- User.ll
82target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
83target triple = "x86_64-unknown-linux-gnu"
84
85%struct.Animal = type { i32 (...)** }
86%struct.Cat = type { %struct.Animal }
87
88@_ZTV3Cat = available_externally dso_local unnamed_addr constant { [3 x i8*] } { [3 x i8*] [i8* null, i8* bitcast (i8** @_ZTI3Cat to i8*), i8* bitcast (void (%struct.Cat*)* @_ZNK3Cat9makeNoiseEv to i8*)] }, align 8, !type !0, !type !1, !type !2, !type !3
89@_ZTI3Cat = external dso_local constant i8*
90@llvm.compiler.used = appending global [1 x i8*] [i8* bitcast ({ [3 x i8*] }* @_ZTV3Cat to i8*)], section "llvm.metadata"
91
92declare dso_local void @_ZNK3Cat9makeNoiseEv(%struct.Cat* nonnull dereferenceable(8)) unnamed_addr
93
94define dso_local void @_Z17useDoThingWithCatv() local_unnamed_addr {
95entry:
96  %call = tail call noalias nonnull dereferenceable(8) i8* @_Znwm(i64 8)
97  %0 = bitcast i8* %call to i32 (...)***
98  store i32 (...)** bitcast (i8** getelementptr inbounds ({ [3 x i8*] }, { [3 x i8*] }* @_ZTV3Cat, i64 0, inrange i32 0, i64 2) to i32 (...)**), i32 (...)*** %0, align 8, !tbaa !4
99  %1 = bitcast i8* %call to %struct.Animal*
100  tail call void @_Z14doThingWithCatP6Animal(%struct.Animal* nonnull %1)
101  ret void
102}
103
104declare dso_local nonnull i8* @_Znwm(i64) local_unnamed_addr
105
106declare dso_local void @_Z14doThingWithCatP6Animal(%struct.Animal*) local_unnamed_addr
107
108!0 = !{i64 16, !"_ZTS3Cat"}
109!1 = !{i64 16, !"_ZTSM3CatKFvvE.virtual"}
110!2 = !{i64 16, !"_ZTS6Animal"}
111!3 = !{i64 16, !"_ZTSM6AnimalKFvvE.virtual"}
112!4 = !{!5, !5, i64 0}
113!5 = !{!"vtable pointer", !6, i64 0}
114!6 = !{!"Simple C++ TBAA"}
115