290a839891
Summary: Records in the module summary index whether the bitcode was compiled with the option necessary to enable splitting the LTO unit (e.g. -fsanitize=cfi, -fwhole-program-vtables, or -fsplit-lto-unit). The information is passed down to the ModuleSummaryIndex builder via a new module flag "EnableSplitLTOUnit", which is propagated onto a flag on the summary index. This is then used during the LTO link to check whether all linked summaries were built with the same value of this flag. If not, an error is issued when we detect a situation requiring whole program visibility of the class hierarchy. This is the case when both of the following conditions are met: 1) We are performing LowerTypeTests or Whole Program Devirtualization. 2) There are type tests or type checked loads in the code. Note I have also changed the ThinLTOBitcodeWriter to also gate the module splitting on the value of this flag. Reviewers: pcc Subscribers: ormris, mehdi_amini, Prazek, inglorion, eraman, steven_wu, dexonsmith, arphaman, dang, llvm-commits Differential Revision: https://reviews.llvm.org/D53890 llvm-svn: 350948
36 lines
1.0 KiB
LLVM
36 lines
1.0 KiB
LLVM
; RUN: opt -thinlto-bc -thin-link-bitcode-file=%t2 -thinlto-split-lto-unit -o %t %s
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; RUN: llvm-dis -o - %t | FileCheck %s
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; RUN: llvm-bcanalyzer -dump %t | FileCheck --check-prefix=BCA %s
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; When not splitting the module, the thin link bitcode file should simply be a
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; copy of the regular module.
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; RUN: diff %t %t2
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; BCA: <FULL_LTO_GLOBALVAL_SUMMARY_BLOCK
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; BCA-NOT: <GLOBALVAL_SUMMARY_BLOCK
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; CHECK: @llvm.global_ctors = appending global
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@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @f }]
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; CHECK: @g = internal global i8 42, !type !0
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@g = internal global i8 42, !type !0
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declare void @sink(i8*)
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; CHECK: define internal void @f()
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define internal void @f() {
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call void @sink(i8* @g)
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ret void
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}
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$h = comdat any
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; CHECK: define void @h() comdat
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define void @h() comdat {
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ret void
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}
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; CHECK: !llvm.module.flags = !{![[FLAG1:[0-9]+]], ![[FLAG2:[0-9]+]]}
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; CHECK: ![[FLAG1]] = !{i32 1, !"EnableSplitLTOUnit", i32 1}
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; CHECK: ![[FLAG2]] = !{i32 1, !"ThinLTO", i32 0}
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!0 = !{i32 0, !"typeid"}
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