forked from OSchip/llvm-project
72 lines
2.8 KiB
LLVM
72 lines
2.8 KiB
LLVM
; REQUIRES: x86
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;; If the vtable symbols are localized by a version script, devirtualization
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;; can still happen.
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; RUN: opt --thinlto-bc -o %t1.o %s
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; RUN: opt --thinlto-bc -o %t2.o %S/Inputs/devirt_vcall_vis_shared_def.ll
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; RUN: echo '{ global: _start; local: *; };' > %t.ver
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; RUN: ld.lld %t1.o %t2.o -o %t.out --save-temps --lto-whole-program-visibility -shared \
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; RUN: -mllvm -pass-remarks=. 2>&1 | count 0
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; RUN: ld.lld %t1.o %t2.o -o %t.out --save-temps --lto-whole-program-visibility -shared \
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; RUN: --version-script=%t.ver -mllvm -pass-remarks=. 2>&1 | FileCheck %s --check-prefix=REMARK
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; RUN: llvm-dis < %t1.o.4.opt.bc | FileCheck %s --check-prefix=CHECK-IR
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; REMARK: 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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@_ZTV1A = available_externally unnamed_addr constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* undef, i8* bitcast (i32 (%struct.A*, i32)* @_ZN1A1fEi to i8*), i8* bitcast (i32 (%struct.A*, i32)* @_ZN1A1nEi to i8*)] }, !type !0, !vcall_visibility !2
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@_ZTV1B = linkonce_odr unnamed_addr 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 !2
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;; Prevent the vtables from being dead code eliminated.
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@llvm.used = appending global [2 x i8*] [ i8* bitcast ( { [4 x i8*] }* @_ZTV1A to i8*), i8* bitcast ( { [4 x i8*] }* @_ZTV1B to i8*)]
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; CHECK-IR-LABEL: @_start(
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define i32 @_start(%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.
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; CHECK-IR: %call = 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 available_externally i32 @_ZN1A1fEi(%struct.A* %this, i32 %a) #0 {
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ret i32 0
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}
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define available_externally i32 @_ZN1A1nEi(%struct.A* %this, i32 %a) #0 {
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ret i32 0
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}
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define linkonce_odr i32 @_ZN1B1fEi(%struct.B* %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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!2 = !{i64 0}
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