Test for codegen of RELEASE_ASSERT vs CHECK in WTF

third_party/WebKit/Source/wtf/text/CString.cpp

Index: third_party/WebKit/Source/wtf/text/CString.cpp
diff --git a/third_party/WebKit/Source/wtf/text/CString.cpp b/third_party/WebKit/Source/wtf/text/CString.cpp
index 4bab024171793196ad958ed0fb567e5eb5fe3e83..1a8ce0f38c8c2701f36eab40d7a57946f34204c9 100644
--- a/third_party/WebKit/Source/wtf/text/CString.cpp
+++ b/third_party/WebKit/Source/wtf/text/CString.cpp
@@ -50,6 +50,20 @@ PassRefPtr<CStringImpl> CStringImpl::createUninitialized(size_t length,
   return adoptRef(new (buffer) CStringImpl(length));
 }
 
+PassRefPtr<CStringImpl> CStringImpl::createUninitializedCHECK(size_t length,
+                                                              char*& data) {
+  // TODO(esprehn): This doesn't account for the NUL.
+  CHECK_LT(length, (numeric_limits<unsigned>::max() - sizeof(CStringImpl)));
+
+  // The +1 is for the terminating NUL character.
+  size_t size = sizeof(CStringImpl) + length + 1;
+  CStringImpl* buffer = static_cast<CStringImpl*>(
+      Partitions::bufferMalloc(size, WTF_HEAP_PROFILER_TYPE_NAME(CStringImpl)));
+  data = reinterpret_cast<char*>(buffer + 1);
+  data[length] = '\0';
+  return adoptRef(new (buffer) CStringImpl(length));
+}
+
 void CStringImpl::operator delete(void* ptr) {
   Partitions::bufferFree(ptr);
 }
@@ -60,7 +74,11 @@ CString::CString(const char* chars, size_t length) {
     return;
   }
   char* data;
-  m_buffer = CStringImpl::createUninitialized(length, data);
+  if (rand() % 2) {
+    m_buffer = CStringImpl::createUninitialized(length, data);
+  } else {
+    m_buffer = CStringImpl::createUninitializedCHECK(length, data);
+  }
   memcpy(data, chars, length);
 }