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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
45 lines
1.3 KiB
LLVM
45 lines
1.3 KiB
LLVM
; Test to check the callgraph for calls to casts.
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; RUN: opt -module-summary %s -o %t.o
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; RUN: llvm-bcanalyzer -dump %t.o | FileCheck %s
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; PR34966
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; CHECK: <GLOBALVAL_SUMMARY_BLOCK
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; CHECK-NEXT: <VERSION
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; CHECK-NEXT: <FLAGS
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; "op7" is a call to "callee" function.
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; CHECK-NEXT: <PERMODULE {{.*}} op8=3 op9=[[ALIASID:[0-9]+]]/>
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; "another_caller" has only references but no calls.
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; CHECK-NEXT: <PERMODULE {{.*}} op4=3 {{.*}} op8={{[0-9]+}}/>
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; CHECK-NEXT: <PERMODULE {{.*}} op0=[[ALIASEEID:[0-9]+]]
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; CHECK-NEXT: <ALIAS {{.*}} op0=[[ALIASID]] {{.*}} op2=[[ALIASEEID]]/>
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; CHECK-NEXT: </GLOBALVAL_SUMMARY_BLOCK>
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; ModuleID = 'thinlto-function-summary-callgraph-cast.ll'
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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 void @caller() {
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call void bitcast (void (...)* @callee to void ()*)()
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call void bitcast (void (...)* @analias to void ()*)()
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ret void
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}
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define void @another_caller() {
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; Test calls that aren't handled either as direct or indirect.
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call void select (i1 icmp eq (i32* @global, i32* null), void ()* @f, void ()* @g)()
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ret void
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}
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declare void @callee(...)
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@analias = alias void (...), bitcast (void ()* @aliasee to void (...)*)
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define void @aliasee() {
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entry:
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ret void
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}
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declare void @f()
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declare void @g()
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@global = extern_weak global i32
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