1; REQUIRES: x86 2; Test that --lto-whole-program-visibility enables devirtualization. 3 4; Note that the --export-dynamic used below is simply to ensure symbols are 5; retained during linking. 6 7; Index based WPD 8; Generate unsplit module with summary for ThinLTO index-based WPD. 9; RUN: opt --thinlto-bc -o %t2.o %s 10; RUN: ld.lld %t2.o -o %t3 -save-temps --lto-whole-program-visibility \ 11; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --check-prefix=REMARK 12; RUN: llvm-dis %t2.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR 13 14; Hybrid WPD 15; Generate split module with summary for hybrid Thin/Regular LTO WPD. 16; RUN: opt --thinlto-bc --thinlto-split-lto-unit -o %t.o %s 17; RUN: ld.lld %t.o -o %t3 -save-temps --lto-whole-program-visibility \ 18; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --check-prefix=REMARK 19; RUN: llvm-dis %t.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR 20 21; Regular LTO WPD 22; RUN: opt -o %t4.o %s 23; RUN: ld.lld %t4.o -o %t3 -save-temps --lto-whole-program-visibility \ 24; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --check-prefix=REMARK 25; RUN: llvm-dis %t3.0.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR 26 27; REMARK-DAG: single-impl: devirtualized a call to _ZN1A1nEi 28; REMARK-DAG: single-impl: devirtualized a call to _ZN1D1mEi 29 30; Try everything again but without -whole-program-visibility to confirm 31; WPD fails 32 33; Index based WPD 34; RUN: ld.lld %t2.o -o %t3 -save-temps \ 35; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --implicit-check-not single-impl --allow-empty 36; RUN: llvm-dis %t2.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR 37; Ensure --no-lto-whole-program-visibility overrides explicit --lto-whole-program-visibility. 38; RUN: ld.lld %t2.o -o %t3 -save-temps --lto-whole-program-visibility --no-lto-whole-program-visibility \ 39; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --implicit-check-not single-impl --allow-empty 40; RUN: llvm-dis %t2.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR 41 42; Hybrid WPD 43; RUN: ld.lld %t.o -o %t3 -save-temps \ 44; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --implicit-check-not single-impl --allow-empty 45; RUN: llvm-dis %t.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR 46 47; Regular LTO WPD 48; RUN: ld.lld %t4.o -o %t3 -save-temps \ 49; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --implicit-check-not single-impl --allow-empty 50; RUN: llvm-dis %t3.0.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR 51 52target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 53target triple = "x86_64-grtev4-linux-gnu" 54 55%struct.A = type { i32 (...)** } 56%struct.B = type { %struct.A } 57%struct.C = type { %struct.A } 58%struct.D = type { i32 (...)** } 59 60@_ZTV1B = constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* undef, i8* bitcast (i32 (%struct.B*, i32)* @_ZN1B1fEi to i8*), i8* bitcast (i32 (%struct.A*, i32)* @_ZN1A1nEi to i8*)] }, !type !0, !type !1, !vcall_visibility !5 61@_ZTV1C = constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* undef, i8* bitcast (i32 (%struct.C*, i32)* @_ZN1C1fEi to i8*), i8* bitcast (i32 (%struct.A*, i32)* @_ZN1A1nEi to i8*)] }, !type !0, !type !2, !vcall_visibility !5 62@_ZTV1D = constant { [3 x i8*] } { [3 x i8*] [i8* null, i8* undef, i8* bitcast (i32 (%struct.D*, i32)* @_ZN1D1mEi to i8*)] }, !type !3, !vcall_visibility !5 63 64 65; CHECK-IR-LABEL: define dso_local i32 @_start 66define i32 @_start(%struct.A* %obj, %struct.D* %obj2, i32 %a) { 67entry: 68 %0 = bitcast %struct.A* %obj to i8*** 69 %vtable = load i8**, i8*** %0 70 %1 = bitcast i8** %vtable to i8* 71 %p = call i1 @llvm.type.test(i8* %1, metadata !"_ZTS1A") 72 call void @llvm.assume(i1 %p) 73 %fptrptr = getelementptr i8*, i8** %vtable, i32 1 74 %2 = bitcast i8** %fptrptr to i32 (%struct.A*, i32)** 75 %fptr1 = load i32 (%struct.A*, i32)*, i32 (%struct.A*, i32)** %2, align 8 76 77 ; Check that the call was devirtualized. 78 ; CHECK-IR: %call = tail call i32 @_ZN1A1nEi 79 ; CHECK-NODEVIRT-IR: %call = tail call i32 %fptr1 80 %call = tail call i32 %fptr1(%struct.A* nonnull %obj, i32 %a) 81 82 %3 = bitcast i8** %vtable to i32 (%struct.A*, i32)** 83 %fptr22 = load i32 (%struct.A*, i32)*, i32 (%struct.A*, i32)** %3, align 8 84 85 ; We still have to call it as virtual. 86 ; CHECK-IR: %call3 = tail call i32 %fptr22 87 ; CHECK-NODEVIRT-IR: %call3 = tail call i32 %fptr22 88 %call3 = tail call i32 %fptr22(%struct.A* nonnull %obj, i32 %call) 89 90 %4 = bitcast %struct.D* %obj2 to i8*** 91 %vtable2 = load i8**, i8*** %4 92 %5 = bitcast i8** %vtable2 to i8* 93 %p2 = call i1 @llvm.type.test(i8* %5, metadata !4) 94 call void @llvm.assume(i1 %p2) 95 96 %6 = bitcast i8** %vtable2 to i32 (%struct.D*, i32)** 97 %fptr33 = load i32 (%struct.D*, i32)*, i32 (%struct.D*, i32)** %6, align 8 98 99 ; Check that the call was devirtualized. 100 ; CHECK-IR: %call4 = tail call i32 @_ZN1D1mEi 101 ; CHECK-NODEVIRT-IR: %call4 = tail call i32 %fptr33 102 %call4 = tail call i32 %fptr33(%struct.D* nonnull %obj2, i32 %call3) 103 ret i32 %call4 104} 105; CHECK-IR-LABEL: ret i32 106; CHECK-IR-LABEL: } 107 108declare i1 @llvm.type.test(i8*, metadata) 109declare void @llvm.assume(i1) 110 111define i32 @_ZN1B1fEi(%struct.B* %this, i32 %a) #0 { 112 ret i32 0; 113} 114 115define i32 @_ZN1A1nEi(%struct.A* %this, i32 %a) #0 { 116 ret i32 0; 117} 118 119define i32 @_ZN1C1fEi(%struct.C* %this, i32 %a) #0 { 120 ret i32 0; 121} 122 123define i32 @_ZN1D1mEi(%struct.D* %this, i32 %a) #0 { 124 ret i32 0; 125} 126 127; Make sure we don't inline or otherwise optimize out the direct calls. 128attributes #0 = { noinline optnone } 129 130!0 = !{i64 16, !"_ZTS1A"} 131!1 = !{i64 16, !"_ZTS1B"} 132!2 = !{i64 16, !"_ZTS1C"} 133!3 = !{i64 16, !4} 134!4 = distinct !{} 135!5 = !{i64 0} 136