diff options
author | Peter Collingbourne <peter@pcc.me.uk> | 2017-07-19 18:18:19 +0000 |
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committer | Peter Collingbourne <peter@pcc.me.uk> | 2017-07-19 18:18:19 +0000 |
commit | dba60ce821fb360874d1b4cad96c0b0592e9479f (patch) | |
tree | 9add2f27b69a751ce56fd1e7b528d60a08279653 /test/LTO | |
parent | 627b94c08c02f36217310bd514d429effd0ad3c3 (diff) |
LTO: Export functions referenced by the CFI jump table.
If the LowerTypeTests pass decides to add a function to a jump
table for CFI, it will add its name to the set cfiFunctionDefs,
which among other things will cause the function to be renamed in
the ThinLTO backend.
One other thing that we must do with such functions is to not
internalize them, because the jump table in the full LTO object will
contain a reference to the actual function body in the ThinLTO object.
This patch handles that by ensuring that we export any functions
whose names appear in the cfiFunctionDefs set.
Fixes PR33831.
Differential Revision: https://reviews.llvm.org/D35605
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308504 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/LTO')
-rw-r--r-- | test/LTO/Resolution/X86/export-jumptable.ll | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/test/LTO/Resolution/X86/export-jumptable.ll b/test/LTO/Resolution/X86/export-jumptable.ll new file mode 100644 index 00000000000..1ab8c065014 --- /dev/null +++ b/test/LTO/Resolution/X86/export-jumptable.ll @@ -0,0 +1,32 @@ +; Test that we do not internalize functions that appear in the CFI jump table in +; the full LTO object file; any such functions will be referenced by the jump +; table. + +; RUN: opt -thinlto-bc -o %t %s +; RUN: llvm-lto2 run -o %t2 -r %t,f1,p -r %t,f2,p -r %t,_start,px %t -save-temps +; RUN: llvm-dis %t2.1.2.internalize.bc -o - | FileCheck %s + +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-unknown-linux-gnu" + +; CHECK: define void @f1() +define void @f1() !type !0 { + ret void +} + +; CHECK: define internal void @f2() +define void @f2() !type !1 { + ret void +} + +define i1 @_start(i8* %p) { + %1 = call i1 @llvm.type.test(i8* %p, metadata !"typeid1") + call void @f1() + call void @f2() + ret i1 %1 +} + +declare i1 @llvm.type.test(i8*, metadata) + +!0 = !{i64 0, !"typeid1"} +!1 = !{i64 0, !"typeid2"} |