| ; REQUIRES: x86 |
| ;; If the vtable symbols are localized by a version script, devirtualization |
| ;; can still happen. |
| |
| ; RUN: opt --thinlto-bc -o %t1.o %s |
| ; RUN: opt --thinlto-bc -o %t2.o %S/Inputs/devirt_vcall_vis_shared_def.ll |
| ; RUN: echo '{ global: _start; local: *; };' > %t.ver |
| |
| ; RUN: ld.lld %t1.o %t2.o -o %t.out --save-temps --lto-whole-program-visibility -shared \ |
| ; RUN: -mllvm -pass-remarks=. 2>&1 | count 0 |
| |
| ; RUN: ld.lld %t1.o %t2.o -o %t.out --save-temps --lto-whole-program-visibility -shared \ |
| ; RUN: --version-script=%t.ver -mllvm -pass-remarks=. 2>&1 | FileCheck %s --check-prefix=REMARK |
| ; RUN: llvm-dis < %t1.o.4.opt.bc | FileCheck %s --check-prefix=CHECK-IR |
| |
| ; REMARK: single-impl: 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 { i32 (...)** } |
| %struct.B = type { %struct.A } |
| |
| @_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 |
| @_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 |
| |
| ;; Prevent the vtables from being dead code eliminated. |
| @llvm.used = appending global [2 x i8*] [ i8* bitcast ( { [4 x i8*] }* @_ZTV1A to i8*), i8* bitcast ( { [4 x i8*] }* @_ZTV1B to i8*)] |
| |
| ; CHECK-IR-LABEL: @_start( |
| define i32 @_start(%struct.A* %obj, i32 %a) { |
| entry: |
| %0 = bitcast %struct.A* %obj to i8*** |
| %vtable = load i8**, i8*** %0 |
| %1 = bitcast i8** %vtable to i8* |
| %p = call i1 @llvm.type.test(i8* %1, metadata !"_ZTS1A") |
| call void @llvm.assume(i1 %p) |
| %fptrptr = getelementptr i8*, i8** %vtable, i32 1 |
| %2 = bitcast i8** %fptrptr to i32 (%struct.A*, i32)** |
| %fptr1 = load i32 (%struct.A*, i32)*, i32 (%struct.A*, i32)** %2, align 8 |
| |
| ;; Check that the call was devirtualized. |
| ; CHECK-IR: %call = tail call i32 @_ZN1A1nEi |
| %call = tail call i32 %fptr1(%struct.A* nonnull %obj, i32 %a) |
| |
| ret i32 %call |
| } |
| ; CHECK-IR-LABEL: ret i32 |
| ; CHECK-IR-LABEL: } |
| |
| declare i1 @llvm.type.test(i8*, metadata) |
| declare void @llvm.assume(i1) |
| |
| define available_externally i32 @_ZN1A1fEi(%struct.A* %this, i32 %a) #0 { |
| ret i32 0 |
| } |
| |
| define available_externally i32 @_ZN1A1nEi(%struct.A* %this, i32 %a) #0 { |
| ret i32 0 |
| } |
| |
| define linkonce_odr i32 @_ZN1B1fEi(%struct.B* %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 0} |