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52c19ef944
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
56 lines
1.8 KiB
LLVM
56 lines
1.8 KiB
LLVM
; Test that the list of CFI jumptable entries is part of ThinLTO cache key.
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; Linking Inputs/cache-icall.ll results in f() being added to CFI jumptable; otherwise it is not.
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; This affects code generated for any users of f(). Make sure that we don't pull a stale object
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; file for %t.o from the cache.
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; RUN: opt -module-hash -module-summary -thinlto-bc -thinlto-split-lto-unit %s -o %t.bc
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; RUN: opt -module-hash -module-summary -thinlto-bc -thinlto-split-lto-unit %p/Inputs/cache-icall.ll -o %t2.bc
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; RUN: rm -Rf %t.cache && mkdir %t.cache
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; RUN: llvm-lto2 run -o %t-no.o %t.bc -cache-dir %t.cache \
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; RUN: -r=%t.bc,_start,px \
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; RUN: -r=%t.bc,f,
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; RUN: llvm-readelf -symbols %t-no.o.* | FileCheck %s --check-prefix=SYMBOLS-NO
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; RUN: llvm-lto2 run -o %t-yes.o %t.bc %t2.bc -cache-dir %t.cache \
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; RUN: -r=%t.bc,_start,px \
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; RUN: -r=%t.bc,f, \
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; RUN: -r=%t2.bc,f,p
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; RUN: llvm-readelf -symbols %t-yes.o.* | FileCheck %s --check-prefix=SYMBOLS-YES
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; SYMBOLS-NO-DAG: {{FUNC .* f.cfi_jt$}}
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; SYMBOLS-NO-DAG: {{NOTYPE .* UND f.cfi_jt$}}
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; SYMBOLS-YES-NOT: f.cfi_jt
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; SYMBOLS-YES-DAG: {{FUNC .* f.cfi$}}
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; SYMBOLS-YES-DAG: {{NOTYPE .* UND f.cfi$}}
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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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define i8* @_start(void ()* %p) !type !0 {
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entry:
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%0 = bitcast void ()* %p to i8*
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%1 = tail call i1 @llvm.type.test(i8* %0, metadata !"_ZTSFvvE")
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br i1 %1, label %cont, label %trap
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trap: ; preds = %entry
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tail call void @llvm.trap()
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unreachable
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cont: ; preds = %entry
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tail call void %p()
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ret i8* bitcast (void ()* @f to i8*)
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}
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declare i1 @llvm.type.test(i8*, metadata)
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declare void @llvm.trap()
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declare !type !1 void @f()
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!0 = !{i64 0, !"_ZTSFPvPFvvEE"}
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!1 = !{i64 0, !"_ZTSFvvE"}
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