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Implement for[in/of]-let construct. (#3294)

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This patch implements let/const support for all "for" statements.
It includes an algorithm for cloning declarative lexical environments.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2019-11-11 13:53:32 +01:00
committed by Dániel Bátyai
parent 58f71e6ffa
commit da69589f05
8 changed files with 503 additions and 110 deletions
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jerry-core/vm/vm.c
+20
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@@ -1335,6 +1335,14 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
}
continue;
}
case VM_OC_CLONE_CONTEXT:
{
JERRY_ASSERT (byte_code_start_p[0] == CBC_EXT_OPCODE);
bool copy_values = (byte_code_start_p[1] == CBC_EXT_CLONE_FULL_CONTEXT);
frame_ctx_p->lex_env_p = ecma_clone_decl_lexical_environment (frame_ctx_p->lex_env_p, copy_values);
continue;
}
case VM_OC_SET_COMPUTED_PROPERTY:
{
/* Swap values. */
@@ -3025,6 +3033,13 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
stack_top_p[-3] = 0;
stack_top_p[-4] = expr_obj_value;
#if ENABLED (JERRY_ES2015)
if (byte_code_p[0] == CBC_EXT_OPCODE && byte_code_p[1] == CBC_EXT_CLONE_CONTEXT)
{
/* No need to duplicate the first context. */
byte_code_p += 2;
}
#endif /* ENABLED (JERRY_ES2015) */
continue;
}
case VM_OC_FOR_IN_GET_NEXT:
@@ -3124,6 +3139,11 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
stack_top_p[-2] = iterator_step;
stack_top_p[-3] = iterator;
if (byte_code_p[0] == CBC_EXT_OPCODE && byte_code_p[1] == CBC_EXT_CLONE_CONTEXT)
{
/* No need to duplicate the first context. */
byte_code_p += 2;
}
continue;
}
case VM_OC_FOR_OF_GET_NEXT: