Packing ecma_object_t to 8 bytes.

2014-08-29 17:38:05 +04:00
parent 8e14f32806
commit 1d02085dc6
8 changed files with 364 additions and 180 deletions
@@ -0,0 +1,60 @@
+/* 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.
+ */
+
+#include "globals.h"
+#include "jrt-bit-fields.h"
+
+/**
+ * Extract a bit-field from the integer.
+ *
+ * @return bit-field's value
+ */
+extern uint64_t
+jrt_extract_bit_field (uint64_t container, /**< container to extract bit-field from */
+                       uint32_t lsb, /**< least significant bit of the value
+                                      *   to be extracted */
+                       uint32_t width) /**< width of the bit-field to be extracted */
+{
+  JERRY_ASSERT (lsb < JERRY_BITSINBYTE * sizeof (uint64_t));
+  JERRY_ASSERT ((lsb + width) <= JERRY_BITSINBYTE * sizeof (uint64_t));
+
+  uint64_t shifted_value = container >> lsb;
+  uint64_t bit_field_mask = (1ull << width) - 1;
+
+  return (shifted_value & bit_field_mask);
+} /* jrt_extract_bit_field */
+
+/**
+ * Extract a bit-field from the integer.
+ *
+ * @return bit-field's value
+ */
+extern uint64_t
+jrt_set_bit_field_value (uint64_t container, /**< container to insert bit-field to */
+                         uint64_t new_bit_field_value, /**< value of bit-field to insert */
+                         uint32_t lsb, /**< least significant bit of the value
+                                        *   to be extracted */
+                         uint32_t width) /**< width of the bit-field to be extracted */
+{
+  JERRY_ASSERT (lsb < JERRY_BITSINBYTE * sizeof (uint64_t));
+  JERRY_ASSERT ((lsb + width) <= JERRY_BITSINBYTE * sizeof (uint64_t));
+  JERRY_ASSERT (new_bit_field_value <= (1ull << width));
+
+  uint64_t bit_field_mask = (1ull << width) - 1;
+  uint64_t shifted_bit_field_mask = bit_field_mask << lsb;
+  uint64_t shifted_new_bit_field_value = new_bit_field_value << lsb;
+
+  return (container & ~shifted_bit_field_mask) | shifted_new_bit_field_value;
+} /* jrt_set_bit_field_value */
@@ -0,0 +1,24 @@
+/* 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 JERRY_BIT_FIELDS_H
+#define JERRY_BIT_FIELDS_H
+
+extern uint64_t jrt_extract_bit_field (uint64_t value, uint32_t lsb,
+                                       uint32_t width);
+extern uint64_t jrt_set_bit_field_value (uint64_t value, uint64_t bit_field_value,
+                                         uint32_t lsb, uint32_t width);
+
+#endif /* !JERRY_BIT_FIELDS_H */