1 files changed, 99 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/wtf/DataLog.cpp b/Source/JavaScriptCore/wtf/DataLog.cpp
new file mode 100644
index 000000000..5a290e45a
--- /dev/null
+++ b/Source/JavaScriptCore/wtf/DataLog.cpp
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "DataLog.h"
+#include <stdarg.h>
+#include <wtf/Threading.h>
+
+#define DATA_LOG_TO_FILE 0
+
+// Uncomment to force logging to the given file regardless of what the environment variable says.
+// #define DATA_LOG_FILENAME "/tmp/WTFLog.txt"
+
+namespace WTF {
+
+#if DATA_LOG_TO_FILE
+static FILE* file;
+
+static void initializeLogFileOnce()
+{
+#ifdef DATA_LOG_FILENAME
+    const char* filename = DATA_LOG_FILENAME
+#else
+    const char* filename = getenv("WTF_DATA_LOG_FILENAME");
+#endif
+    if (filename) {
+        file = fopen(filename, "w");
+        if (!file)
+            fprintf(stderr, "Warning: Could not open log file %s for writing.\n", filename);
+    }
+    if (!file)
+        file = stderr;
+    
+    setvbuf(file, 0, _IONBF, 0); // Prefer unbuffered output, so that we get a full log upon crash or deadlock.
+}
+
+#if OS(DARWIN)
+static pthread_once_t initializeLogFileOnceKey = PTHREAD_ONCE_INIT;
+#endif
+
+static void initializeLogFile()
+{
+#if OS(DARWIN)
+    pthread_once(&initializeLogFileOnceKey, initializeLogFileOnce);
+#else
+    if (!file)
+        initializeLogFileOnce();
+#endif
+}
+
+FILE* dataFile()
+{
+    initializeLogFile();
+    return file;
+}
+#else // DATA_LOG_TO_FILE
+FILE* dataFile()
+{
+    return stderr;
+}
+#endif // DATA_LOG_TO_FILE
+
+void dataLogV(const char* format, va_list argList)
+{
+    vfprintf(dataFile(), format, argList);
+}
+
+void dataLog(const char* format, ...)
+{
+    va_list argList;
+    va_start(argList, format);
+    dataLogV(format, argList);
+    va_end(argList);
+}
+
+} // namespace WTF
+