[cfi] Support explicit sections for functions in cfi-icall.

Allow explicit section for indirectly called functions in cfi-icall.
Jumptables for functions in the same type class must be contiguous, so they
always go to the default text section.

Fixes PR25079.

llvm-svn: 266486

1 files changed, 26 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LowerBitSets/section.ll b/llvm/test/Transforms/LowerBitSets/section.ll
new file mode 100644
index 00000000000..d5f94148676
--- /dev/null
+++ b/llvm/test/Transforms/LowerBitSets/section.ll
@@ -0,0 +1,26 @@
+; Test that functions with "section" attribute are accepted, and jumptables are
+; emitted in ".text".
+
+; RUN: opt -S -lowerbitsets < %s | FileCheck %s
+
+target triple = "x86_64-unknown-linux-gnu"
+
+; CHECK: @[[A:.*]] = private constant {{.*}} section ".text"
+; CHECK: @f = alias void (), bitcast ({{.*}}* @[[A]] to void ()*)
+; CHECK: define private void {{.*}} section "xxx"
+
+define void @f() section "xxx" {
+entry:
+  ret void
+}
+
+define i1 @g() {
+entry:
+  %0 = call i1 @llvm.bitset.test(i8* bitcast (void ()* @f to i8*), metadata !"_ZTSFvE")
+  ret i1 %0
+}
+
+declare i1 @llvm.bitset.test(i8*, metadata) nounwind readnone
+
+!llvm.bitsets = !{!0}
+!0 = !{!"_ZTSFvE", void ()* @f, i64 0}