Adding ecma-try-catch-macro.h that should have been a part of previous commit.

src/libecmaoperations/ecma-try-catch-macro.h

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+/* Copyright 2014 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ECMA_TRY_CATCH_MACRO_H
+#define ECMA_TRY_CATCH_MACRO_H
+
+/**
+ * The macro defines try-block that initializes variable 'var' with 'op'
+ * and checks for exceptions that might be thrown during initialization.
+ *
+ * If no exception was thrown, then code after the try-block is executed.
+ * Otherwise, throw-completion value is just copied to return_value.
+ *
+ * Note:
+ *      Each ECMA_TRY_CATCH should have it's own corresponding ECMA_FINALIZE
+ *      statement with same argument as corresponding ECMA_TRY_CATCH's first argument.
+ */
+#define ECMA_TRY_CATCH(var, op, return_value) \
+  ecma_completion_value_t var = op; \
+  if ( unlikely( ecma_is_completion_value_throw( var) ) ) \
+  { \
+    return_value = ecma_copy_completion_value( var); \
+  } \
+  else \
+  { \
+    JERRY_ASSERT( ecma_is_completion_value_normal( var) )
+
+/**
+ * The macro marks end of code block that is executed if no exception
+ * was catched by corresponding ECMA_TRY_CATCH and frees variable,
+ * initialized by the ECMA_TRY_CATCH.
+ *
+ * Note:
+ *      Each ECMA_TRY_CATCH should be followed by ECMA_FINALIZE with same
+ *      argument as corresponding ECMA_TRY_CATCH's first argument.
+ */
+#define ECMA_FINALIZE(var) } \
+  ecma_free_completion_value( var)
+
+#endif /* !ECMA_TRY_CATCH_MACRO_H */