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LTO: Export functions referenced by non-canonical CFI jump tables

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LowerTypeTests pass adds functions with a non-canonical jump table
to cfiFunctionDecls instead of cfiFunctionDefs. As the jump table
is in the regular LTO object, these functions will also need to be
exported. This change fixes the non-canonical jump table case and
adds a test similar to the existing one for canonical jump tables.

Reviewed By: pcc

Differential Revision: https://reviews.llvm.org/D103120
This commit is contained in:
Sami Tolvanen 2021-06-08 14:57:32 -07:00 committed by Nick Desaulniers
parent c40da26524
commit dd2d6bb1ca
2 changed files with 38 additions and 0 deletions
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3
lib/LTO/LTO.cpp
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@ -1480,6 +1480,9 @@ Error LTO::runThinLTO(AddStreamFn AddStream, NativeObjectCache Cache,
for (auto &Def : ThinLTO.CombinedIndex.cfiFunctionDefs())
ExportedGUIDs.insert(
GlobalValue::getGUID(GlobalValue::dropLLVMManglingEscape(Def)));
for (auto &Decl : ThinLTO.CombinedIndex.cfiFunctionDecls())
ExportedGUIDs.insert(
GlobalValue::getGUID(GlobalValue::dropLLVMManglingEscape(Decl)));
auto isExported = [&](StringRef ModuleIdentifier, ValueInfo VI) {
const auto &ExportList = ExportLists.find(ModuleIdentifier);

35
test/LTO/Resolution/X86/export-jumptable-noncanonical.ll Normal file
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@ -0,0 +1,35 @@
; 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 -thinlto-split-lto-unit -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-p270:32:32-p271:32:32-p272:64:64-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(i1 %i) {
%1 = select i1 %i, void ()* @f1, void ()* @f2
%2 = bitcast void ()* %1 to i8*
%3 = call i1 @llvm.type.test(i8* %2, metadata !"typeid1")
ret i1 %3
}
declare i1 @llvm.type.test(i8*, metadata)
!llvm.module.flags = !{!2}
!0 = !{i64 0, !"typeid1"}
!1 = !{i64 0, !"typeid2"}
!2 = !{i32 4, !"CFI Canonical Jump Tables", i32 0}