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;; Test that symbols defined in shared libraries prevent devirtualization.
;; First check that we get devirtualization when the defs are in the
;; LTO unit.
;; Index based WPD
;; Generate unsplit module with summary for ThinLTO index-based WPD.
; RUN: opt --thinlto-bc -o %t1a.o %s
; RUN: opt --thinlto-bc -o %t2a.o %S/Inputs/devirt_vcall_vis_shared_def.ll
; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
; RUN: --plugin-opt=whole-program-visibility \
; RUN: --plugin-opt=save-temps \
; RUN: --plugin-opt=-pass-remarks=. \
; RUN: %t1a.o %t2a.o -o %t3a 2>&1 | FileCheck %s --check-prefix=REMARK
; RUN: llvm-dis %t1a.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR
;; Hybrid WPD
;; Generate split module with summary for hybrid Thin/Regular LTO WPD.
; RUN: opt --thinlto-bc --thinlto-split-lto-unit -o %t1b.o %s
; RUN: opt --thinlto-bc --thinlto-split-lto-unit -o %t2b.o %S/Inputs/devirt_vcall_vis_shared_def.ll
; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
; RUN: --plugin-opt=whole-program-visibility \
; RUN: --plugin-opt=save-temps \
; RUN: --plugin-opt=-pass-remarks=. \
; RUN: %t1b.o %t2b.o -o %t3b 2>&1 | FileCheck %s --check-prefix=REMARK
; RUN: llvm-dis %t1b.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR
;; Regular LTO WPD
; RUN: opt -o %t1c.o %s
; RUN: opt -o %t2c.o %S/Inputs/devirt_vcall_vis_shared_def.ll
; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
; RUN: --plugin-opt=whole-program-visibility \
; RUN: --plugin-opt=save-temps \
; RUN: --plugin-opt=-pass-remarks=. \
; RUN: %t1c.o %t2c.o -o %t3c 2>&1 | FileCheck %s --check-prefix=REMARK
; RUN: llvm-dis %t3c.0.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR
; REMARK-DAG: single-impl: devirtualized a call to _ZN1A1nEi
;; Check that WPD fails with when linking against a shared library
;; containing the strong defs of the vtables.
; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
; RUN: %t2c.o -o %t.so -shared
;; Index based WPD
; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
; RUN: --plugin-opt=whole-program-visibility \
; RUN: --plugin-opt=-pass-remarks=. \
; RUN: %t1a.o %t.so -o %t4a \
; RUN: --export-dynamic 2>&1 | count 0
;; Hybrid WPD
; RUN: opt --thinlto-bc --thinlto-split-lto-unit -o %t4.o %s
; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
; RUN: --plugin-opt=whole-program-visibility \
; RUN: --plugin-opt=-pass-remarks=. \
; RUN: %t1b.o %t.so -o %t4b \
; RUN: --export-dynamic 2>&1 | count 0
;; Regular LTO WPD
; RUN: opt -o %t4.o %s
; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
; RUN: --plugin-opt=whole-program-visibility \
; RUN: --plugin-opt=-pass-remarks=. \
; RUN: %t1c.o %t.so -o %t4c \
; RUN: --export-dynamic 2>&1 | count 0
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: define dso_local i32 @_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
; CHECK-NODEVIRT-IR: %call = tail call i32 %fptr1
%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}
|
