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1003e07d66
Summary: Removing the dropped symbols will prevent indirect call promotion in the ThinLTO Backend from adding a new reference to a symbol, which can result in linker unsats. This can happen when we compile with a sample profile collected from one binary by used for another, which may have profiled targets that aren't used in the new binary. Note that until dropDeadSymbols handles variables and aliases (in progress), we may not be able to remove the declaration and can still have an issue. Reviewers: grimar, davidxl Subscribers: mehdi_amini, inglorion, llvm-commits, eraman Differential Revision: https://reviews.llvm.org/D42816 llvm-svn: 324299
132 lines
4.8 KiB
LLVM
132 lines
4.8 KiB
LLVM
; RUN: opt -module-summary %s -o %t1.bc
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; RUN: opt -module-summary %p/Inputs/deadstrip.ll -o %t2.bc
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; RUN: llvm-lto -thinlto-action=thinlink -o %t.index.bc %t1.bc %t2.bc
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; RUN: llvm-lto -exported-symbol=_main -thinlto-action=promote %t1.bc -thinlto-index=%t.index.bc -o - | llvm-lto -exported-symbol=_main -thinlto-action=internalize -thinlto-index %t.index.bc -thinlto-module-id=%t1.bc - -o - | llvm-dis -o - | FileCheck %s
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; RUN: llvm-lto -exported-symbol=_main -thinlto-action=promote %t2.bc -thinlto-index=%t.index.bc -o - | llvm-lto -exported-symbol=_main -thinlto-action=internalize -thinlto-index %t.index.bc -thinlto-module-id=%t2.bc - -o - | llvm-dis -o - | FileCheck %s --check-prefix=CHECK2
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; RUN: llvm-lto -exported-symbol=_main -thinlto-action=run %t1.bc %t2.bc
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; RUN: llvm-nm %t1.bc.thinlto.o | FileCheck %s --check-prefix=CHECK-NM
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; RUN: llvm-lto2 run %t1.bc %t2.bc -o %t.out -save-temps \
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; RUN: -r %t1.bc,_main,plx \
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; RUN: -r %t1.bc,_bar,pl \
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; RUN: -r %t1.bc,_dead_func,pl \
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; RUN: -r %t1.bc,_baz,l \
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; RUN: -r %t1.bc,_boo,l \
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; RUN: -r %t2.bc,_baz,pl \
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; RUN: -r %t2.bc,_boo,pl \
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; RUN: -r %t2.bc,_dead_func,l \
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; RUN: -r %t2.bc,_another_dead_func,pl
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; RUN: llvm-dis < %t.out.1.3.import.bc | FileCheck %s --check-prefix=LTO2
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; RUN: llvm-dis < %t.out.2.3.import.bc | FileCheck %s --check-prefix=LTO2-CHECK2
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; RUN: llvm-nm %t.out.1 | FileCheck %s --check-prefix=CHECK2-NM
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; RUN: llvm-bcanalyzer -dump %t.out.index.bc | FileCheck %s --check-prefix=COMBINED
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; Live, NotEligibleForImport, dso_local, Internal
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; COMBINED-DAG: <COMBINED {{.*}} op2=119
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; Live, dso_local, Internal
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; COMBINED-DAG: <COMBINED {{.*}} op2=103
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; Live, Local, External
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; COMBINED-DAG: <COMBINED {{.*}} op2=96
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; COMBINED-DAG: <COMBINED {{.*}} op2=96
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; COMBINED-DAG: <COMBINED {{.*}} op2=96
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; Local, (Dead)
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; COMBINED-DAG: <COMBINED {{.*}} op2=64
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; COMBINED-DAG: <COMBINED {{.*}} op2=64
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; COMBINED-DAG: <COMBINED {{.*}} op2=64
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; Dead-stripping on the index allows to internalize these,
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; and limit the import of @baz thanks to early pruning.
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; CHECK-NOT: available_externally {{.*}} @baz()
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; CHECK: @llvm.global_ctors =
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; CHECK: define internal void @_GLOBAL__I_a()
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; CHECK: define internal void @bar() {
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; CHECK: define internal void @bar_internal()
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; CHECK: define internal void @dead_func() {
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; CHECK-NOT: available_externally {{.*}} @baz()
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; LTO2-NOT: available_externally {{.*}} @baz()
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; LTO2: @llvm.global_ctors =
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; LTO2: define internal void @_GLOBAL__I_a()
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; LTO2: define internal void @bar() {
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; LTO2: define internal void @bar_internal()
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; LTO2-NOT: @dead_func()
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; LTO2-NOT: available_externally {{.*}} @baz()
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; Make sure we didn't internalize @boo, which is reachable via
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; llvm.global_ctors
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; CHECK2: define void @boo()
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; LTO2-CHECK2: define dso_local void @boo()
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; We should have eventually removed @baz since it was internalized and unused
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; CHECK2-NM-NOT: _baz
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; The final binary should not contain any of the dead functions,
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; only main is expected because bar is expected to be inlined and stripped out.
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; CHECK-NM-NOT: bar
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; CHECK-NM-NOT: dead
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; CHECK-NM: T _main
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; CHECK-NM-NOT: bar
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; CHECK-NM-NOT: dead
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; Next test the case where Inputs/deadstrip.ll does not get a module index,
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; which will cause it to be handled by regular LTO in the new LTO API.
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; In that case there are uses of @dead_func in the regular LTO partition
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; and it shouldn't be internalized.
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; RUN: opt %p/Inputs/deadstrip.ll -o %t3.bc
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; RUN: llvm-lto2 run %t1.bc %t3.bc -o %t4.out -save-temps \
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; RUN: -r %t1.bc,_main,plx \
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; RUN: -r %t1.bc,_bar,pl \
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; RUN: -r %t1.bc,_dead_func,pl \
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; RUN: -r %t1.bc,_baz,l \
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; RUN: -r %t1.bc,_boo,l \
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; RUN: -r %t3.bc,_baz,pl \
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; RUN: -r %t3.bc,_boo,pl \
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; RUN: -r %t3.bc,_dead_func,l \
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; RUN: -r %t3.bc,_another_dead_func,pl
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; RUN: llvm-dis < %t4.out.1.3.import.bc | FileCheck %s --check-prefix=CHECK-NOTDEAD
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; RUN: llvm-nm %t4.out.0 | FileCheck %s --check-prefix=CHECK-NM-NOTDEAD
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; We can't internalize @dead_func because of the use in the regular LTO
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; partition.
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; CHECK-NOTDEAD: define dso_local void @dead_func()
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; We also can't eliminate @baz because it is in the regular LTO partition
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; and called from @dead_func.
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; CHECK-NM-NOTDEAD: T _baz
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.11.0"
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@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @_GLOBAL__I_a }]
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declare void @baz()
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declare void @boo()
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define internal void @_GLOBAL__I_a() #1 section "__TEXT,__StaticInit,regular,pure_instructions" {
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entry:
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call void @boo()
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ret void
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}
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define void @bar() {
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ret void
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}
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define internal void @bar_internal() {
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ret void
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}
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define void @dead_func() {
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call void @bar()
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call void @baz()
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call void @bar_internal()
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ret void
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}
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define void @main() {
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call void @bar()
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call void @bar_internal()
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ret void
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}
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