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Implement throwing const re-assignment error. (#3697)

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JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2020-04-29 15:50:22 +02:00
committed by GitHub
parent 9e6c44be4f
commit 4b780507e1
14 changed files with 220 additions and 52 deletions
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jerry-core/parser/js/js-scanner-util.c
+34
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@@ -2291,6 +2291,40 @@ scanner_decode_map_to (parser_scope_stack_t *stack_item_p) /**< scope stack item
#endif /* ENABLED (JERRY_ES2015) */
} /* scanner_decode_map_to */
#if ENABLED (JERRY_ES2015)
/**
* Checks whether the literal is a const in the current scope.
*
* @return true if the literal is a const
*/
bool
scanner_literal_is_const_reg (parser_context_t *context_p, /**< context */
uint16_t literal_index) /**< literal index */
{
if (literal_index < PARSER_REGISTER_START)
{
/* Re-assignment of non-register const bindings are detected elsewhere. */
return false;
}
parser_scope_stack_t *scope_stack_p = context_p->scope_stack_p + context_p->scope_stack_top;
literal_index = (uint16_t) (literal_index - (PARSER_REGISTER_START - 1));
do
{
/* Registers must be found in the scope stack. */
JERRY_ASSERT (scope_stack_p > context_p->scope_stack_p);
scope_stack_p--;
}
while (literal_index != (scope_stack_p->map_to & PARSER_SCOPE_STACK_REGISTER_MASK));
return (scope_stack_p->map_to & PARSER_SCOPE_STACK_IS_CONST) != 0;
} /* scanner_literal_is_const_reg */
#endif /* ENABLED (JERRY_ES2015) */
/**
* @}
* @}