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Implement the core of let/const statement. (#3239)

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This patch implements the core part of let/const statements. Redeclarations are correctly
detected and separate contexts are correctly created for these statements. Register
optimizations are also emplyed whenever possible.

Lots of features are still missing:
 - checking the var statements in eval
 - const are treated as lets
 - single statement checks are missing
 - export declarations are exported as vars, let/const export is not supported

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2019-10-25 18:08:10 +02:00
committed by Dániel Bátyai
parent 4b352758c1
commit 3d797b8836
33 changed files with 1997 additions and 217 deletions
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jerry-core/parser/js/js-lexer.c
+9 -2
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@@ -1476,7 +1476,14 @@ lexer_process_char_literal (parser_context_t *context_p, /**< context */
{
scope_stack_p--;
if (scope_stack_p->map_from == literal_index)
#if ENABLED (JERRY_ES2015)
bool cond = (scope_stack_p->map_from == literal_index
&& scope_stack_p->map_to != PARSER_SCOPE_STACK_FUNC);
#else /* ENABLED (JERRY_ES2015) */
bool cond = (scope_stack_p->map_from == literal_index);
#endif /* ENABLED (JERRY_ES2015) */
if (cond)
{
JERRY_ASSERT (scope_stack_p->map_to >= PARSER_REGISTER_START
|| (literal_p->status_flags & LEXER_FLAG_USED));
@@ -2322,7 +2329,7 @@ lexer_expect_identifier (parser_context_t *context_p, /**< context */
context_p->token.literal_is_reserved = false;
context_p->token.lit_location.type = LEXER_IDENT_LITERAL;
context_p->token.lit_location.has_escape = false;
lexer_construct_literal_object (context_p, &lexer_default_literal, lexer_default_literal.type);
lexer_construct_literal_object (context_p, &lexer_default_literal, literal_type);
context_p->status_flags &= (uint32_t) ~(PARSER_MODULE_DEFAULT_CLASS_OR_FUNC);
return;
}