forked from OSchip/llvm-project
78 lines
2.6 KiB
LLVM
78 lines
2.6 KiB
LLVM
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; REQUIRES: x86-registered-target
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; Test that devirtualization option -wholeprogramdevirt-check adds code to check
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; that the devirtualization decision was correct and trap if not.
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; The vtables have vcall_visibility metadata with hidden visibility, to enable
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; devirtualization.
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; Generate unsplit module with summary for ThinLTO index-based WPD.
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; RUN: opt -thinlto-bc -o %t2.o %s
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; RUN: llvm-lto2 run %t2.o -save-temps -use-new-pm -pass-remarks=. \
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; RUN: -wholeprogramdevirt-check \
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; RUN: -o %t3 \
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; RUN: -r=%t2.o,test,px \
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; RUN: -r=%t2.o,_ZN1A1nEi,p \
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; RUN: -r=%t2.o,_ZN1B1fEi,p \
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; RUN: -r=%t2.o,_ZTV1B,px 2>&1 | FileCheck %s --check-prefix=REMARK
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; RUN: llvm-dis %t3.1.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR
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; REMARK-DAG: single-impl: devirtualized a call to _ZN1A1nEi
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-grtev4-linux-gnu"
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%struct.A = type { i32 (...)** }
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%struct.B = type { %struct.A }
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@_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
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; CHECK-IR-LABEL: define i32 @test
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define i32 @test(%struct.A* %obj, i32 %a) {
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entry:
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%0 = bitcast %struct.A* %obj to i8***
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%vtable = load i8**, i8*** %0
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%1 = bitcast i8** %vtable to i8*
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%p = call i1 @llvm.type.test(i8* %1, metadata !"_ZTS1A")
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call void @llvm.assume(i1 %p)
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%fptrptr = getelementptr i8*, i8** %vtable, i32 1
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%2 = bitcast i8** %fptrptr to i32 (%struct.A*, i32)**
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%fptr1 = load i32 (%struct.A*, i32)*, i32 (%struct.A*, i32)** %2, align 8
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; Check that the call was devirtualized, but preceeded by a check guarding
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; a trap if the function pointer doesn't match.
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; CHECK-IR: %.not = icmp eq i32 (%struct.A*, i32)* %fptr1, @_ZN1A1nEi
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; CHECK-IR: br i1 %.not, label %3, label %2
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; CHECK-IR: 2:
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; CHECK-IR: tail call void @llvm.debugtrap()
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; CHECK-IR: br label %3
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; CHECK-IR: 3:
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; CHECK-IR: tail call i32 @_ZN1A1nEi
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%call = tail call i32 %fptr1(%struct.A* nonnull %obj, i32 %a)
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ret i32 %call
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}
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; CHECK-IR-LABEL: ret i32
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; CHECK-IR-LABEL: }
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declare i1 @llvm.type.test(i8*, metadata)
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declare void @llvm.assume(i1)
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define i32 @_ZN1B1fEi(%struct.B* %this, i32 %a) #0 {
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ret i32 0;
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}
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define i32 @_ZN1A1nEi(%struct.A* %this, i32 %a) #0 {
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ret i32 0;
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}
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; Make sure we don't inline or otherwise optimize out the direct calls.
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attributes #0 = { noinline optnone }
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!0 = !{i64 16, !"_ZTS1A"}
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!1 = !{i64 16, !"_ZTS1B"}
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!3 = !{i64 16, !4}
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!4 = distinct !{}
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!5 = !{i64 1}
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