From 218c582cb59c9a70e4ebdb7ebe0e9c59faec6d0c Mon Sep 17 00:00:00 2001
From: Evgeniy Stepanov <eugeni.stepanov@gmail.com>
Date: Thu, 28 Feb 2013 11:25:54 +0000
Subject: [PATCH] [msan] Lit tests for __attribute__((no_sanitize_memory)).

llvm-svn: 176248
---
 .../lib/msan/lit_tests/no_sanitize_memory.cc  | 34 +++++++++++++++++++
 .../msan/lit_tests/no_sanitize_memory_prop.cc | 33 ++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 compiler-rt/lib/msan/lit_tests/no_sanitize_memory.cc
 create mode 100644 compiler-rt/lib/msan/lit_tests/no_sanitize_memory_prop.cc

diff --git a/compiler-rt/lib/msan/lit_tests/no_sanitize_memory.cc b/compiler-rt/lib/msan/lit_tests/no_sanitize_memory.cc
new file mode 100644
index 000000000000..48afc17e35e9
--- /dev/null
+++ b/compiler-rt/lib/msan/lit_tests/no_sanitize_memory.cc
@@ -0,0 +1,34 @@
+// RUN: %clangxx_msan -m64 -O0 %s -o %t && %t >%t.out 2>&1
+// RUN: %clangxx_msan -m64 -O1 %s -o %t && %t >%t.out 2>&1
+// RUN: %clangxx_msan -m64 -O2 %s -o %t && %t >%t.out 2>&1
+// RUN: %clangxx_msan -m64 -O3 %s -o %t && %t >%t.out 2>&1
+
+// RUN: %clangxx_msan -m64 -O0 %s -o %t -DCHECK_IN_F && %t >%t.out 2>&1
+// RUN: %clangxx_msan -m64 -O1 %s -o %t -DCHECK_IN_F && %t >%t.out 2>&1
+// RUN: %clangxx_msan -m64 -O2 %s -o %t -DCHECK_IN_F && %t >%t.out 2>&1
+// RUN: %clangxx_msan -m64 -O3 %s -o %t -DCHECK_IN_F && %t >%t.out 2>&1
+
+// Test that (no_sanitize_memory) functions
+// * don't check shadow values (-DCHECK_IN_F)
+// * treat all values loaded from memory as fully initialized (-UCHECK_IN_F)
+
+#include <stdlib.h>
+#include <stdio.h>
+
+__attribute__((noinline))
+__attribute__((no_sanitize_memory))
+int f(void) {
+  int x;
+  int * volatile p = &x;
+#ifdef CHECK_IN_F
+  if (*p)
+    exit(0);
+#endif
+  return *p;
+}
+
+int main(void) {
+  if (f())
+    exit(0);
+  return 0;
+}
diff --git a/compiler-rt/lib/msan/lit_tests/no_sanitize_memory_prop.cc b/compiler-rt/lib/msan/lit_tests/no_sanitize_memory_prop.cc
new file mode 100644
index 000000000000..c74ca6b89db9
--- /dev/null
+++ b/compiler-rt/lib/msan/lit_tests/no_sanitize_memory_prop.cc
@@ -0,0 +1,33 @@
+// RUN: %clangxx_msan -m64 -O0 %s -o %t && %t >%t.out 2>&1
+// RUN: %clangxx_msan -m64 -O1 %s -o %t && not %t >%t.out 2>&1
+// RUN: FileCheck %s < %t.out
+// RUN: %clangxx_msan -m64 -O2 %s -o %t && not %t >%t.out 2>&1
+// RUN: FileCheck %s < %t.out
+// RUN: %clangxx_msan -m64 -O3 %s -o %t && not %t >%t.out 2>&1
+// RUN: FileCheck %s < %t.out
+
+// Test that (no_sanitize_memory) functions propagate shadow.
+
+// Note that at -O0 there is no report, because 'x' in 'f' is spilled to the
+// stack, and then loaded back as a fully initialiazed value (due to
+// no_sanitize_memory attribute).
+
+#include <stdlib.h>
+#include <stdio.h>
+
+__attribute__((noinline))
+__attribute__((no_sanitize_memory))
+int f(int x) {
+  return x;
+}
+
+int main(void) {
+  int x;
+  int * volatile p = &x;
+  int y = f(*p);
+  // CHECK: WARNING: Use of uninitialized value
+  // CHECK: {{#0 0x.* in main .*no_sanitize_memory_prop.cc:}}[[@LINE+1]]
+  if (y)
+    exit(0);
+  return 0;
+}