Implement setjmp / longjmp in jerry-libc.

JerryScript-DCO-1.0-Signed-off-by: Ruben Ayrapetyan r.ayrapetyan@samsung.com

tests/unit/test-longjmp.cpp

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+/* Copyright 2015 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.
+ */
+
+#include "test-common.h"
+
+#define TEST_MAX_DEPTH 10
+#define TEST_ITERATIONS_NUM 256
+
+jmp_buf buffers[TEST_MAX_DEPTH];
+
+static void
+test_setjmp_longjmp (volatile int depth)
+{
+  if (depth != TEST_MAX_DEPTH)
+  {
+    int a = 1, b = 2, c = 3;
+
+    int array[256];
+    for (int i = 0; i < 256; i++)
+    {
+      array[i] = i;
+    }
+
+    (void) a;
+    (void) b;
+    (void) c;
+    (void) array;
+
+    int k = setjmp (buffers[depth]);
+
+    if (k == 0)
+    {
+      test_setjmp_longjmp (depth + 1);
+    }
+    else
+    {
+      JERRY_ASSERT (k == depth + 1);
+
+      JERRY_ASSERT (a == 1);
+      JERRY_ASSERT (b == 2);
+      JERRY_ASSERT (c == 3);
+
+      for (int i = 0; i < 256; i++)
+      {
+        JERRY_ASSERT (array[i] == i);
+      }
+    }
+  }
+  else
+  {
+    int t = rand () % depth;
+    JERRY_ASSERT (t >= 0 && t < depth);
+
+    longjmp (buffers[t], t + 1);
+  }
+}
+
+int
+main (int __attr_unused___ argc,
+      char __attr_unused___ **argv)
+{
+  TEST_INIT ();
+
+  for (int i = 0; i < TEST_ITERATIONS_NUM; i++)
+  {
+    test_setjmp_longjmp (0);
+  }
+
+  return 0;
+} /* main */