Rework storing the line/column/bytecode info (#4707)

This information is stored in a separate memory block instead of being part of the byte code. Snapshot does not supported. JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
2021-07-15 13:45:10 +02:00
parent 4be05a74eb
commit 998e49a969
22 changed files with 1218 additions and 201 deletions
@@ -0,0 +1,121 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * 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_LINE_INFO_H
+#define ECMA_LINE_INFO_H
+
+/** \addtogroup ecma ECMA
+ * @{
+ *
+ * \addtogroup ecmalineinfo Line info
+ * @{
+ */
+
+#if JERRY_LINE_INFO
+
+#include "ecma-globals.h"
+
+/**
+ * Increase the current value of line or column.
+ */
+#define ECMA_LINE_INFO_INCREASE 0x0
+
+/**
+ * Decrease the current value of line or column.
+ */
+#define ECMA_LINE_INFO_DECREASE 0x1
+
+/**
+ * Line update is present.
+ */
+#define ECMA_LINE_INFO_HAS_LINE 0x1
+
+/**
+ * A default value for columns after a line update.
+ */
+#define ECMA_LINE_INFO_COLUMN_DEFAULT 126
+
+/**
+ * Vlq encoding: flag which is set for all bytes except the last one.
+ */
+#define ECMA_LINE_INFO_VLQ_CONTINUE 0x80
+
+/**
+ * Vlq encoding: mask to decode the number fragment.
+ */
+#define ECMA_LINE_INFO_VLQ_MASK 0x7f
+
+/**
+ * Vlq encoding: number of bits stored in a byte.
+ */
+#define ECMA_LINE_INFO_VLQ_SHIFT 7
+
+/**
+ * Small encoding: a value which represents a two byte long number.
+ */
+#define ECMA_LINE_INFO_ENCODE_TWO_BYTE (UINT8_MAX - 2)
+
+/**
+ * Small encoding: minimum value of an encoded two byte long number.
+ */
+#define ECMA_LINE_INFO_ENCODE_TWO_BYTE_MIN (UINT8_MAX - 2)
+
+/**
+ * Small encoding: a value which represents a three byte long number.
+ */
+#define ECMA_LINE_INFO_ENCODE_THREE_BYTE (UINT8_MAX - 1)
+
+/**
+ * Small encoding: minimum value of an encoded three byte long number.
+ */
+#define ECMA_LINE_INFO_ENCODE_THREE_BYTE_MIN (ECMA_LINE_INFO_ENCODE_TWO_BYTE_MIN + UINT8_MAX + 1)
+
+/**
+ * Small encoding: a value which represents a five byte long number.
+ */
+#define ECMA_LINE_INFO_ENCODE_FIVE_BYTE UINT8_MAX
+
+/**
+ * Maximum number of line/column entries stored in a stream.
+ */
+#define ECMA_LINE_INFO_STREAM_VALUE_COUNT_MAX 48
+
+/**
+ * Minimum size of a stream (except the last one).
+ */
+#define ECMA_LINE_INFO_STREAM_SIZE_MIN \
+  ((2 * ECMA_LINE_INFO_STREAM_VALUE_COUNT_MAX) - 1)
+
+/* Helper functions for parser/js/js-parser-line-info-create.c. */
+uint32_t ecma_line_info_decode_vlq (uint8_t **buffer_p);
+uint32_t ecma_line_info_difference_update (uint32_t current_value, uint32_t difference_value);
+
+/* General functions. */
+void ecma_line_info_free (uint8_t *line_info_p);
+void ecma_line_info_get (uint8_t *line_info_p, uint32_t offset,
+                         jerry_backtrace_location_t *location_p);
+
+#if JERRY_PARSER_DUMP_BYTE_CODE
+void ecma_line_info_dump (uint8_t *line_info_p);
+#endif /* JERRY_PARSER_DUMP_BYTE_CODE */
+
+#endif /* ECMA_LINE_INFO_H */
+
+/**
+ * @}
+ * @}
+ */
+
+#endif /* !ECMA_LINE_INFO_H */