Reapply r183552. This time, use a standard type for the option to avoid template
instantiation issue with non-standard type.
Add a backend option to warn on a given stack size limit.
Option: -mllvm -warn-stack-size=<limit>
Output (if limit is exceeded):
warning: Stack size limit exceeded (<actual size>) in <functionName>.
The longer term plan is to hook that to a clang warning.
PR:4072
<rdar://problem/13987214>.
llvm-svn: 183595
diff --git a/llvm/test/CodeGen/X86/warn-stack.ll b/llvm/test/CodeGen/X86/warn-stack.ll
new file mode 100644
index 0000000..5979f45
--- /dev/null
+++ b/llvm/test/CodeGen/X86/warn-stack.ll
@@ -0,0 +1,24 @@
+; RUN: llc -mtriple x86_64-apple-macosx10.8.0 -warn-stack-size=80 < %s 2>&1 >/dev/null | FileCheck %s
+; Check the internal option that warns when the stack size exceeds the
+; given amount.
+; <rdar://13987214>
+
+; CHECK-NOT: nowarn
+define void @nowarn() nounwind ssp {
+entry:
+ %buffer = alloca [12 x i8], align 1
+ %arraydecay = getelementptr inbounds [12 x i8]* %buffer, i64 0, i64 0
+ call void @doit(i8* %arraydecay) nounwind
+ ret void
+}
+
+; CHECK: warning: Stack size limit exceeded (104) in warn.
+define void @warn() nounwind ssp {
+entry:
+ %buffer = alloca [80 x i8], align 1
+ %arraydecay = getelementptr inbounds [80 x i8]* %buffer, i64 0, i64 0
+ call void @doit(i8* %arraydecay) nounwind
+ ret void
+}
+
+declare void @doit(i8*)