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Implement binary literal parsing (#3439)

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This patch will allow the user to use binary literals starting with 0b or 0B,
these literals will be evaluated in parsing time resulting an integer

Co-authored-by: Robert Fancsik frobert@inf.u-szeged.hu
JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu
This commit is contained in:
Szilagyi Adam
2019-12-17 11:42:29 +01:00
committed by Dániel Bátyai
parent 3c0beaf87d
commit b6f2ff1ba7
7 changed files with 113 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
jerry-core/parser/js/js-lexer.c
+35 -2
View File
@@ -33,6 +33,9 @@
* @{
*/
JERRY_STATIC_ASSERT (LEXER_NUMBER_BINARY > LEXER_NUMBER_OCTAL,
lexer_number_binary_must_be_greater_than_lexer_number_octal);
/**
* Check whether the UTF-8 intermediate is an octet or not
*/
@@ -1255,6 +1258,28 @@ lexer_parse_number (parser_context_t *context_p) /**< context */
{
parser_raise_error (context_p, PARSER_ERR_INVALID_NUMBER);
}
#if ENABLED (JERRY_ES2015)
else if (LEXER_TO_ASCII_LOWERCASE (source_p[1]) == LIT_CHAR_LOWERCASE_B)
{
context_p->token.extra_value = LEXER_NUMBER_BINARY;
context_p->token.lit_location.char_p++;
context_p->source_p++;
source_p += 2;
if (source_p >= source_end_p
|| !lit_char_is_binary_digit (source_p[0]))
{
parser_raise_error (context_p, PARSER_ERR_INVALID_BIN_DIGIT);
}
do
{
source_p++;
}
while (source_p < source_end_p
&& lit_char_is_binary_digit (source_p[0]));
}
#endif /* ENABLED (JERRY_ES2015) */
else
{
can_be_float = true;
@@ -2201,7 +2226,7 @@ lexer_construct_number_object (parser_context_t *context_p, /**< context */
uint32_t literal_index = 0;
prop_length_t length = context_p->token.lit_location.length;
if (context_p->token.extra_value != LEXER_NUMBER_OCTAL)
if (context_p->token.extra_value < LEXER_NUMBER_OCTAL)
{
num = ecma_utf8_string_to_number (context_p->token.lit_location.char_p,
length);
@@ -2210,12 +2235,20 @@ lexer_construct_number_object (parser_context_t *context_p, /**< context */
{
const uint8_t *src_p = context_p->token.lit_location.char_p;
const uint8_t *src_end_p = src_p + length - 1;
ecma_number_t multiplier = 8.0;
#if ENABLED (JERRY_ES2015)
if (context_p->token.extra_value == LEXER_NUMBER_BINARY)
{
multiplier = 2.0;
}
#endif /* ENABLED (JERRY_ES2015) */
num = 0;
do
{
src_p++;
num = num * 8 + (ecma_number_t) (*src_p - LIT_CHAR_0);
num = num * multiplier + (ecma_number_t) (*src_p - LIT_CHAR_0);
}
while (src_p < src_end_p);
}