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Fix iterator position calculation for array patterns (#3494)

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This patch fixes #3455.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
This commit is contained in:
Robert Fancsik
2020-01-14 16:03:26 +01:00
committed by GitHub
parent c8ce7d8791
commit 210b631b21
7 changed files with 75 additions and 17 deletions
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jerry-core/parser/js/js-parser-expr.c
+17 -9
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@@ -2665,6 +2665,8 @@ parser_pattern_process_assignment (parser_context_t *context_p, /**< context */
}
else
{
parser_flush_cbc (context_p);
uint16_t stack_depth_before = context_p->stack_depth;
parser_parse_expression (context_p, PARSE_EXPR_NO_COMMA | PARSE_EXPR_LEFT_HAND_SIDE);
if (!PARSER_IS_PUSH_LITERAL (context_p->last_cbc_opcode))
@@ -2675,17 +2677,23 @@ parser_pattern_process_assignment (parser_context_t *context_p, /**< context */
parser_raise_error (context_p, PARSER_ERR_INVALID_DESTRUCTURING_PATTERN);
}
if (context_p->last_cbc_opcode == CBC_PUSH_PROP_THIS_LITERAL)
{
context_p->last_cbc_opcode = PARSER_CBC_UNAVAILABLE;
uint16_t lit_index = context_p->last_cbc.literal_index;
parser_emit_cbc (context_p, CBC_PUSH_THIS);
parser_emit_cbc_literal (context_p, CBC_PUSH_PROP_LITERAL, lit_index);
}
if (end_type == LEXER_RIGHT_SQUARE)
{
PARSER_PLUS_EQUAL_U16 (rhs_opcode, 1);
/* LHS expression parsing may increases the stack depth, therefore rhs opcode may transforms:
Example: [a.b.c]
CBC_EXT_ITERATOR_STEP -> CBC_EXT_ITERATOR_STEP_2
CBC_EXT_REST_INITIALIZER -> CBC_EXT_ITERATOR_STEP_2 */
uint16_t stack_difference = (uint16_t) (context_p->stack_depth - stack_depth_before);
if (context_p->last_cbc_opcode == CBC_PUSH_PROP_LITERAL_LITERAL)
{
/* Example: [a.b]
CBC_EXT_ITERATOR_STEP -> CBC_EXT_ITERATOR_STEP_3
CBC_EXT_REST_INITIALIZER -> CBC_EXT_ITERATOR_STEP_3 */
PARSER_PLUS_EQUAL_U16 (stack_difference, 2);
}
PARSER_PLUS_EQUAL_U16 (rhs_opcode, stack_difference);
}
}
}