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This is an ELF-specific thing that adds SHF_LINK_ORDER to the global's section pointing to the metadata argument's section. The effect of that is a reverse dependency between sections for the linker GC. !associated does not change the behavior of global-dce. The global may also need to be added to llvm.compiler.used. Since SHF_LINK_ORDER is per-section, !associated effectively enables fdata-sections for the affected globals, the same as comdats do. Differential Revision: https://reviews.llvm.org/D29104 llvm-svn: 298157
59 lines
2.0 KiB
LLVM
59 lines
2.0 KiB
LLVM
; Do setup work for all below tests: generate bitcode and combined index
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; RUN: opt -module-summary %s -o %t.bc -bitcode-mdindex-threshold=0
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; RUN: opt -module-summary %p/Inputs/lazyload_metadata.ll -o %t2.bc -bitcode-mdindex-threshold=0
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; RUN: llvm-lto -thinlto-action=thinlink -o %t3.bc %t.bc %t2.bc
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; REQUIRES: asserts
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; Check that importing @globalfunc1 does not trigger loading all the global
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; metadata for @globalfunc2 and @globalfunc3
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; RUN: llvm-lto -thinlto-action=import %t2.bc -thinlto-index=%t3.bc \
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; RUN: -o /dev/null -stats \
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; RUN: 2>&1 | FileCheck %s -check-prefix=LAZY
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; LAZY: 51 bitcode-reader - Number of Metadata records loaded
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; LAZY: 2 bitcode-reader - Number of MDStrings loaded
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; RUN: llvm-lto -thinlto-action=import %t2.bc -thinlto-index=%t3.bc \
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; RUN: -o /dev/null -disable-ondemand-mds-loading -stats \
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; RUN: 2>&1 | FileCheck %s -check-prefix=NOTLAZY
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; NOTLAZY: 60 bitcode-reader - Number of Metadata records loaded
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; NOTLAZY: 7 bitcode-reader - Number of MDStrings loaded
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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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define void @globalfunc1(i32 %arg) {
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%x = call i1 @llvm.type.test(i8* undef, metadata !"typeid1")
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%tmp = add i32 %arg, 0, !metadata !2
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ret void
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}
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; We need two functions here that will both reference the same metadata.
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; This is to force the metadata to be emitted in the global metadata block and
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; not in the function specific metadata.
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; These function are not imported and so we don't want to load their metadata.
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define void @globalfunc2(i32 %arg) {
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%x = call i1 @llvm.type.test(i8* undef, metadata !"typeid1")
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%tmp = add i32 %arg, 0, !metadata !1
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ret void
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}
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define void @globalfunc3(i32 %arg) {
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%tmp = add i32 %arg, 0, !metadata !1
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ret void
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}
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declare i1 @llvm.type.test(i8* %ptr, metadata %bitset) nounwind readnone
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!1 = !{!2, !3, !4, !5, !6, !7, !8, !9}
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!2 = !{!"Hello World"}
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!3 = !{!"3"}
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!4 = !{!"4"}
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!5 = !{!"5"}
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!6 = !{!9}
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!7 = !{!"7"}
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!8 = !{!"8"}
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!9 = !{!6}
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