6e4c1cf293
Previously this option could be used to skip devirtualizations of the given functions in regular LTO and in the ThinLTO indexing step. This change allows them to be skipped in the backend as well, which is useful when debugging WPD in a distributed ThinLTO backend. Differential Revision: https://reviews.llvm.org/D91812
122 lines
5.2 KiB
LLVM
122 lines
5.2 KiB
LLVM
; REQUIRES: x86-registered-target
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; Backend test for distribute ThinLTO with CFI.
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; It additionally enables -fwhole-program-vtables to get more information in
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; TYPE_IDs of GLOBALVAL_SUMMARY_BLOCK.
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; RUN: opt -thinlto-bc -thinlto-split-lto-unit -o %t.o %s
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; FIXME: Fix machine verifier issues and remove -verify-machineinstrs=0. PR39436.
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; RUN: llvm-lto2 run -thinlto-distributed-indexes %t.o \
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; RUN: -whole-program-visibility \
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; RUN: -verify-machineinstrs=0 \
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; RUN: -o %t2.index \
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; RUN: -r=%t.o,test,px \
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; RUN: -r=%t.o,_ZN1A1nEi,p \
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; RUN: -r=%t.o,_ZN1B1fEi,p \
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; RUN: -r=%t.o,_ZN1C1fEi,p \
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; RUN: -r=%t.o,_ZTV1B, \
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; RUN: -r=%t.o,_ZTV1C, \
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; RUN: -r=%t.o,_ZN1A1nEi, \
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; RUN: -r=%t.o,_ZN1B1fEi, \
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; RUN: -r=%t.o,_ZN1C1fEi, \
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; RUN: -r=%t.o,_ZTV1B,px \
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; RUN: -r=%t.o,_ZTV1C,px
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; Ensure that typeids are in the index.
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; RUN: llvm-bcanalyzer -dump %t.o.thinlto.bc | FileCheck %s
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; CHECK-LABEL: <GLOBALVAL_SUMMARY_BLOCK
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; CHECK: <TYPE_ID op0=0 op1=6 op2=4 op3=7 op4=0 op5=0 op6=0 op7=0 op8=0 op9=2 op10=6 op11=0 op12=0 op13=8 op14=1 op15=6 op16=9 op17=0/>
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; CHECK-LABEL: </GLOBALVAL_SUMMARY_BLOCK
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; CHECK-LABEL: <STRTAB_BLOCK
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; CHECK: blob data = '_ZTS1A_ZN1A1nEi'
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; CHECK-LABEL: </STRTAB_BLOCK
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; RUN: llvm-dis %t.o.thinlto.bc -o - | FileCheck %s --check-prefix=CHECK-DIS
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; Round trip it through llvm-as
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; RUN: llvm-dis %t.o.thinlto.bc -o - | llvm-as -o - | llvm-dis -o - | FileCheck %s --check-prefix=CHECK-DIS
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; CHECK-DIS: ^0 = module: (path: "{{.*}}thinlto-distributed-cfi-devirt.ll.tmp.o", hash: ({{.*}}, {{.*}}, {{.*}}, {{.*}}, {{.*}}))
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; CHECK-DIS: ^1 = gv: (guid: 8346051122425466633, summaries: (function: (module: ^0, flags: (linkage: external, notEligibleToImport: 0, live: 1, dsoLocal: 0, canAutoHide: 0), insts: 18, typeIdInfo: (typeTests: (^2), typeCheckedLoadVCalls: (vFuncId: (^2, offset: 8), vFuncId: (^2, offset: 0))))))
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; CHECK-DIS: ^2 = typeid: (name: "_ZTS1A", summary: (typeTestRes: (kind: allOnes, sizeM1BitWidth: 7), wpdResolutions: ((offset: 0, wpdRes: (kind: branchFunnel)), (offset: 8, wpdRes: (kind: singleImpl, singleImplName: "_ZN1A1nEi"))))) ; guid = 7004155349499253778
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; RUN: %clang_cc1 -triple x86_64-grtev4-linux-gnu \
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; RUN: -emit-obj -fthinlto-index=%t.o.thinlto.bc -O2 -Rpass=wholeprogramdevirt \
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; RUN: -emit-llvm -o - -x ir %t.o 2>&1 | FileCheck %s --check-prefixes=CHECK-IR --check-prefixes=REMARKS
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; Check that the devirtualization is suppressed via -wholeprogramdevirt-skip
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; RUN: %clang_cc1 -triple x86_64-grtev4-linux-gnu -mllvm -wholeprogramdevirt-skip=_ZN1A1nEi \
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; RUN: -emit-obj -fthinlto-index=%t.o.thinlto.bc -O2 -Rpass=wholeprogramdevirt \
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; RUN: -emit-llvm -o - -x ir %t.o 2>&1 | FileCheck %s --check-prefixes=SKIP-IR --check-prefixes=SKIP-REMARKS
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; REMARKS: single-impl: devirtualized a call to _ZN1A1nEi
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; SKIP-REMARKS-NOT: single-impl
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; Check that backend does not fail generating native code.
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; RUN: %clang_cc1 -triple x86_64-grtev4-linux-gnu \
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; RUN: -emit-obj -fthinlto-index=%t.o.thinlto.bc -O2 \
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; RUN: -o %t.native.o -x ir %t.o
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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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%struct.C = 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
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@_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
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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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%vtable5 = load i8*, i8** %0
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%1 = tail call { i8*, i1 } @llvm.type.checked.load(i8* %vtable5, i32 8, metadata !"_ZTS1A")
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%2 = extractvalue { i8*, i1 } %1, 1
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br i1 %2, label %cont, label %trap
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trap:
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tail call void @llvm.trap()
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unreachable
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cont:
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%3 = extractvalue { i8*, i1 } %1, 0
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%4 = bitcast i8* %3 to i32 (%struct.A*, i32)*
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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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; SKIP-IR-NOT: %call = tail call i32 @_ZN1A1nEi
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%call = tail call i32 %4(%struct.A* nonnull %obj, i32 %a)
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%vtable16 = load i8*, i8** %0
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%5 = tail call { i8*, i1 } @llvm.type.checked.load(i8* %vtable16, i32 0, metadata !"_ZTS1A")
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%6 = extractvalue { i8*, i1 } %5, 1
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br i1 %6, label %cont2, label %trap
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cont2:
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%7 = extractvalue { i8*, i1 } %5, 0
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%8 = bitcast i8* %7 to i32 (%struct.A*, i32)*
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; Check that traps are conditional. Invalid TYPE_ID can cause
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; unconditional traps.
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; CHECK-IR: br i1 {{.*}}, label %trap
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; We still have to call it as virtual.
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; CHECK-IR: %call3 = tail call i32 %7
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%call3 = tail call i32 %8(%struct.A* nonnull %obj, i32 %call)
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ret i32 %call3
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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 { i8*, i1 } @llvm.type.checked.load(i8*, i32, metadata)
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declare void @llvm.trap()
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declare i32 @_ZN1B1fEi(%struct.B* %this, i32 %a)
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declare i32 @_ZN1A1nEi(%struct.A* %this, i32 %a)
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declare i32 @_ZN1C1fEi(%struct.C* %this, i32 %a)
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!0 = !{i64 16, !"_ZTS1A"}
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!1 = !{i64 16, !"_ZTS1B"}
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!2 = !{i64 16, !"_ZTS1C"}
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