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
45 lines
1.6 KiB
LLVM
45 lines
1.6 KiB
LLVM
; Generate bitcode files with summary, as well as minimized bitcode without
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; the debug metadata for the thin link.
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; RUN: opt -thinlto-bc -thin-link-bitcode-file=%t2 -thinlto-split-lto-unit -o %t %s
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; RUN: llvm-modextract -b -n 0 -o %t0.bc %t
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; RUN: llvm-modextract -b -n 1 -o %t1.bc %t
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; RUN: llvm-modextract -b -n 0 -o %t0.thinlink.bc %t2
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; RUN: llvm-modextract -b -n 1 -o %t1.thinlink.bc %t2
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; RUN: not llvm-modextract -b -n 2 -o - %t 2>&1 | FileCheck --check-prefix=ERROR %s
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; RUN: llvm-dis -o - %t0.bc | FileCheck --check-prefix=M0 %s
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; RUN: llvm-dis -o - %t1.bc | FileCheck --check-prefix=M1 %s
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; RUN: llvm-bcanalyzer -dump %t0.bc | FileCheck --check-prefix=BCA0 %s
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; RUN: llvm-bcanalyzer -dump %t1.bc | FileCheck --check-prefix=BCA1 %s
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; Make sure the combined index files produced by both the normal and the
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; thin link bitcode files are identical
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; RUN: llvm-lto -thinlto -o %t3 %t0.bc
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; Copy the minimized bitcode to the regular bitcode path so the module
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; paths in the index are the same.
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; RUN: cp %t0.thinlink.bc %t0.bc
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; RUN: llvm-lto -thinlto -o %t4 %t0.bc
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; RUN: diff %t3.thinlto.bc %t4.thinlto.bc
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; ERROR: llvm-modextract: error: module index out of range; bitcode file contains 2 module(s)
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; BCA0: <GLOBALVAL_SUMMARY_BLOCK
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; BCA1: <FULL_LTO_GLOBALVAL_SUMMARY_BLOCK
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; 16 = not eligible to import
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; BCA1: <PERMODULE_GLOBALVAR_INIT_REFS {{.*}} op1=16
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; BCA1-NOT: <GLOBALVAL_SUMMARY_BLOCK
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$g = comdat any
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; M0: @g = external global i8{{$}}
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; M1: @g = global i8 42, comdat, !type !0
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@g = global i8 42, comdat, !type !0
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; M0: define i8* @f()
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; M1-NOT: @f()
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define i8* @f() {
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ret i8* @g
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}
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; M1: !0 = !{i32 0, !"typeid"}
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!0 = !{i32 0, !"typeid"}
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