initial checkin of SkSL compiler

src/sksl/SkSLUtil.h

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+ 
+#ifndef SKSL_UTIL
+#define SKSL_UTIL
+
+#include <string>
+#include <sstream>
+#include "stdlib.h"
+#include "SkTypes.h"    
+
+namespace SkSL {
+
+// our own definitions of certain std:: functions, because they are not always present on Android
+
+template <typename T> std::string to_string(T value) {
+#ifdef SK_BUILD_FOR_ANDROID
+    std::stringstream buffer;
+    buffer << value;
+    return buffer.str();
+#else
+    return to_string(value);
+#endif
+}
+
+int stoi(std::string s);
+
+double stod(std::string s);
+
+long stol(std::string s);
+
+void sksl_abort() __attribute__((__noreturn__));
+
+} // namespace
+
+#ifdef DEBUG
+#define ASSERT(x) assert(x)
+#define ASSERT_RESULT(x) { bool result = x; ASSERT(x); }
+#else
+#define ASSERT(x)
+#define ASSERT_RESULT(x) x
+#endif
+
+#define ABORT(...) { SkDebugf(__VA_ARGS__); sksl_abort(); }
+
+#endif