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Parser improvements.

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The number of delete opcodes is reduced to two from six. The
range of numbers which can be included in the byte code is
doubled from (-127,127) to (-256,256).

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2016-06-09 05:52:17 -07:00
parent 3c83af9f23
commit eed84a7dd9
8 changed files with 79 additions and 64 deletions
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jerry-core/parser/js/js-parser-util.c
+6 -11
View File
@@ -310,8 +310,10 @@ parser_emit_cbc_push_number (parser_context_t *context_p, /**< context */
parser_flush_cbc (context_p);
}
JERRY_ASSERT (value < CBC_PUSH_NUMBER_1_RANGE_END);
JERRY_ASSERT (CBC_STACK_ADJUST_VALUE (cbc_flags[CBC_PUSH_NUMBER_1]) == 1);
cbc_opcode_t opcode = is_negative_number ? CBC_PUSH_NUMBER_NEG_BYTE : CBC_PUSH_NUMBER_POS_BYTE;
JERRY_ASSERT (value > 0 && value <= CBC_PUSH_NUMBER_BYTE_RANGE_END);
JERRY_ASSERT (CBC_STACK_ADJUST_VALUE (cbc_flags[opcode]) == 1);
context_p->stack_depth++;
@@ -325,18 +327,11 @@ parser_emit_cbc_push_number (parser_context_t *context_p, /**< context */
real_value = -real_value;
}
printf (" [%3d] %s number:%d\n", (int) context_p->stack_depth, cbc_names[CBC_PUSH_NUMBER_1], real_value);
printf (" [%3d] %s number:%d\n", (int) context_p->stack_depth, cbc_names[opcode], real_value);
}
#endif /* PARSER_DUMP_BYTE_CODE */
if (is_negative_number)
{
PARSER_PLUS_EQUAL_U16 (value, CBC_PUSH_NUMBER_1_RANGE_END);
}
parser_emit_two_bytes (context_p,
CBC_PUSH_NUMBER_1,
(uint8_t) value);
parser_emit_two_bytes (context_p, opcode, (uint8_t) (value - 1));
context_p->byte_code_size += 2;