From 6baf581b93d3a2bde29fcabd4a30fe946a002c05 Mon Sep 17 00:00:00 2001
From: Quentin Colombet <qcolombet@apple.com>
Date: Fri, 7 Jun 2013 20:18:12 +0000
Subject: 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: 183552
---
 llvm/test/CodeGen/ARM/warn-stack.ll | 24 ++++++++++++++++++++++++
 llvm/test/CodeGen/X86/warn-stack.ll | 24 ++++++++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 llvm/test/CodeGen/ARM/warn-stack.ll
 create mode 100644 llvm/test/CodeGen/X86/warn-stack.ll

(limited to 'llvm/test/CodeGen')

diff --git a/llvm/test/CodeGen/ARM/warn-stack.ll b/llvm/test/CodeGen/ARM/warn-stack.ll
new file mode 100644
index 00000000000..4ddc846dc7e
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/warn-stack.ll
@@ -0,0 +1,24 @@
+; RUN: llc -march arm -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 (92) 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*)
diff --git a/llvm/test/CodeGen/X86/warn-stack.ll b/llvm/test/CodeGen/X86/warn-stack.ll
new file mode 100644
index 00000000000..0a6a506c7a6
--- /dev/null
+++ b/llvm/test/CodeGen/X86/warn-stack.ll
@@ -0,0 +1,24 @@
+; RUN: llc -march x86 -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 (92) 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*)
-- 
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