[Exception Handling] Unwind tables are required for all functions that have an EH personality.

This patch is for defect:
https://bugs.llvm.org/show_bug.cgi?id=32611

Functions may require unwind tables even if they are marked with the attribute
nounwind. Any function with an EH personality may require an unwind table.

Differential Revision: https://reviews.llvm.org/D50987

llvm-svn: 340614

1 files changed, 51 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/PowerPC/uwtables.ll b/llvm/test/CodeGen/PowerPC/uwtables.ll
new file mode 100644
index 00000000000..1968b715a1b
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/uwtables.ll
@@ -0,0 +1,51 @@
+; RUN: llc -mcpu=pwr9 -mtriple=powerpc64le-unknown-unknown \
+; RUN:   -verify-machineinstrs -ppc-asm-full-reg-names \
+; RUN:   -ppc-vsr-nums-as-vr < %s | FileCheck %s
+; RUN: llc -mcpu=pwr8 -mtriple=powerpc64le-unknown-unknown \
+; RUN:   -verify-machineinstrs -ppc-asm-full-reg-names \
+; RUN:   -ppc-vsr-nums-as-vr < %s | FileCheck %s
+; RUN: llc -mtriple=powerpc64-unknown-unknown \
+; RUN:   -verify-machineinstrs -ppc-asm-full-reg-names \
+; RUN:   -ppc-vsr-nums-as-vr < %s | FileCheck %s
+
+
+@_ZTIi = external constant i8*
+
+; Function is marked as nounwind but it still throws with __cxa_throw and
+; calls __cxa_call_unexpected.
+; Need to make sure that we do not only have a debug frame.
+; Function Attrs: noreturn nounwind
+define void @_Z4funcv() local_unnamed_addr #0 personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+entry:
+  %exception = tail call i8* @__cxa_allocate_exception(i64 4)
+  %0 = bitcast i8* %exception to i32*
+  store i32 100, i32* %0, align 16
+  invoke void @__cxa_throw(i8* %exception, i8* bitcast (i8** @_ZTIi to i8*), i8* null)
+          to label %unreachable unwind label %lpad
+
+lpad:                                             ; preds = %entry
+  %1 = landingpad { i8*, i32 }
+          filter [0 x i8*] zeroinitializer
+  %2 = extractvalue { i8*, i32 } %1, 0
+  tail call void @__cxa_call_unexpected(i8* %2)
+  unreachable
+
+unreachable:                                      ; preds = %entry
+  unreachable
+; CHECK-LABEL: _Z4funcv
+; CHECK-NOT: .debug_frame
+; CHECK: .cfi_personality
+; CHECK: .cfi_endproc
+}
+
+declare i8* @__cxa_allocate_exception(i64) local_unnamed_addr
+
+declare void @__cxa_throw(i8*, i8*, i8*) local_unnamed_addr
+
+declare i32 @__gxx_personality_v0(...)
+
+declare void @__cxa_call_unexpected(i8*) local_unnamed_addr
+
+
+attributes #0 = { noreturn nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="ppc64le" "target-features"="+altivec,+bpermd,+crypto,+direct-move,+extdiv,+htm,+power8-vector,+vsx,-power9-vector,-qpx" "unsafe-fp-math"="false" "use-soft-float"="false" }
+