85 lines
3.9 KiB
LLVM
85 lines
3.9 KiB
LLVM
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; Test to ensure we don't internalize or treat as dead a global value
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; with a valid C identifier section name. Otherwise, ELF linker generation of
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; __start_"sectionname" and __stop_"sectionname" symbols would not occur and
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; we can end up with undefined references at link time.
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; First try RegularLTO
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; RUN: opt %s -o %t.o
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; RUN: llvm-lto2 dump-symtab %t.o | FileCheck %s --check-prefix=SYMTAB
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; RUN: opt %p/Inputs/global_with_section.ll -o %t2.o
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; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
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; RUN: --plugin-opt=save-temps \
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; RUN: -o %t3.o %t.o %t2.o
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; Check results of internalization
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; RUN: llvm-dis %t3.o.0.2.internalize.bc -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK2-REGULARLTO
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; Next try ThinLTO
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; RUN: opt -module-summary %s -o %t.o
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; RUN: llvm-lto2 dump-symtab %t.o | FileCheck %s --check-prefix=SYMTAB
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; RUN: opt -module-summary %p/Inputs/global_with_section.ll -o %t2.o
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; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
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; RUN: --plugin-opt=thinlto \
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; RUN: --plugin-opt=save-temps \
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; RUN: -o %t3.o %t.o %t2.o
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; Check results of internalization
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; RUN: llvm-dis %t.o.2.internalize.bc -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-THINLTO
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; RUN: llvm-dis %t2.o.2.internalize.bc -o - | FileCheck %s --check-prefix=CHECK2-THINLTO
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; SYMTAB: deadfunc_with_section
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; SYMTAB-NEXT: section some_other_section
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; SYMTAB-NEXT: deadfunc_with_nonC_section
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; SYMTAB-NEXT: section .nonCsection
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; SYMTAB-NEXT: deadfunc2_called_from_section
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; SYMTAB-NEXT: deadfunc2_called_from_nonC_section
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; SYMTAB-NEXT: var_with_section
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; SYMTAB-NEXT: section some_section
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; SYMTAB-NEXT: var_with_nonC_section
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; SYMTAB-NEXT: section .nonCsection
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; We should not internalize @var_with_section due to section
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; CHECK-DAG: @var_with_section = dso_local global i32 0, section "some_section"
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@var_with_section = global i32 0, section "some_section"
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; Confirm via a variable with a non-C identifier section that we are getting
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; the expected internalization.
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; CHECK-REGULARLTO-DAG: @var_with_nonC_section = internal global i32 0, section ".nonCsection"
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; Check we dropped definition of dead variable.
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; CHECK-THINLTO-NOT: @var_with_nonC_section
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@var_with_nonC_section = global i32 0, section ".nonCsection"
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; We should not internalize @deadfunc_with_section due to section
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; CHECK-DAG: define dso_local void @deadfunc_with_section() section "some_other_section"
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define void @deadfunc_with_section() section "some_other_section" {
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call void @deadfunc2_called_from_section()
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ret void
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}
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; Confirm via a function with a non-C identifier section that we are getting
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; the expected internalization.
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; CHECK2-REGULARLTO-DAG: define internal void @deadfunc_with_nonC_section() section ".nonCsection"
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; Check dead function converted to declaration.
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; CHECK-THINLTO-NOT: @deadfunc_with_nonC_section()
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define void @deadfunc_with_nonC_section() section ".nonCsection" {
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call void @deadfunc2_called_from_nonC_section()
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ret void
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}
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; In RegularLTO mode, where we have combined all the IR,
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; @deadfunc2_called_from_section can be internalized.
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; CHECK2-REGULARLTO: define internal void @deadfunc2_called_from_section
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; In ThinLTO mode, we can't internalize it as it needs to be preserved
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; (due to the access from @deadfunc_with_section which must be preserved), and
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; can't be internalized since the reference is from a different module.
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; CHECK2-THINLTO: define dso_local void @deadfunc2_called_from_section
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declare void @deadfunc2_called_from_section()
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; Confirm when called from a function with a non-C identifier section that we
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; are getting the expected internalization.
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; CHECK2-REGULARLTO: define internal void @deadfunc2_called_from_nonC_section
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; Check dead function converted to declaration.
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; CHECK2-THINLTO-NOT: @deadfunc2_called_from_nonC_section
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declare void @deadfunc2_called_from_nonC_section()
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