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Improve line info construction (#4718)

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- Simplify small encoding
- Better line info for some corner cases

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2021-07-16 16:08:38 +02:00
committed by GitHub
parent d5a7839632
commit 252d68936f
7 changed files with 61 additions and 64 deletions
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jerry-core/ecma/base/ecma-line-info.h
+5 -10
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@@ -45,7 +45,7 @@
/**
* A default value for columns after a line update.
*/
#define ECMA_LINE_INFO_COLUMN_DEFAULT 126
#define ECMA_LINE_INFO_COLUMN_DEFAULT 127
/**
* Vlq encoding: flag which is set for all bytes except the last one.
@@ -65,27 +65,22 @@
/**
* Small encoding: a value which represents a two byte long number.
*/
#define ECMA_LINE_INFO_ENCODE_TWO_BYTE (UINT8_MAX - 2)
#define ECMA_LINE_INFO_ENCODE_TWO_BYTE (UINT8_MAX - 1)
/**
* Small encoding: minimum value of an encoded two byte long number.
*/
#define ECMA_LINE_INFO_ENCODE_TWO_BYTE_MIN (UINT8_MAX - 2)
#define ECMA_LINE_INFO_ENCODE_TWO_BYTE_MIN (UINT8_MAX - 1)
/**
* Small encoding: a value which represents a three byte long number.
*/
#define ECMA_LINE_INFO_ENCODE_THREE_BYTE (UINT8_MAX - 1)
#define ECMA_LINE_INFO_ENCODE_VLQ UINT8_MAX
/**
* 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
#define ECMA_LINE_INFO_ENCODE_VLQ_MIN (ECMA_LINE_INFO_ENCODE_TWO_BYTE_MIN + UINT8_MAX + 1)
/**
* Maximum number of line/column entries stored in a stream.