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Reduce try context stack consumption to 1 from 2. (#3898)

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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
2020-06-17 14:39:53 +02:00
committed by GitHub
parent 5bcb78482a
commit 8e010146a9
5 changed files with 64 additions and 31 deletions
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jerry-core/vm/vm.c
+19 -15
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@@ -2255,7 +2255,6 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
}
case VM_OC_ASYNC_EXIT:
{
JERRY_ASSERT (frame_ctx_p->context_depth == PARSER_TRY_CONTEXT_STACK_ALLOCATION);
JERRY_ASSERT (VM_GET_REGISTERS (frame_ctx_p) + register_end + frame_ctx_p->context_depth == stack_top_p);
result = frame_ctx_p->block_result;
@@ -2271,22 +2270,26 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
JERRY_CONTEXT (current_new_target) = old_new_target_p;
}
left_value = stack_top_p[-2];
vm_stack_context_type_t context_type = VM_GET_CONTEXT_TYPE (stack_top_p[-1]);
if (VM_GET_CONTEXT_TYPE (stack_top_p[-1]) == VM_CONTEXT_FINALLY_THROW)
if (context_type == VM_CONTEXT_TRY)
{
JERRY_ASSERT (frame_ctx_p->context_depth == PARSER_TRY_CONTEXT_STACK_ALLOCATION);
left_value = ECMA_VALUE_UNDEFINED;
}
else
{
JERRY_ASSERT (frame_ctx_p->context_depth == PARSER_FINALLY_CONTEXT_STACK_ALLOCATION);
left_value = stack_top_p[-2];
}
if (context_type == VM_CONTEXT_FINALLY_THROW)
{
ecma_reject_promise (result, left_value);
}
else
{
JERRY_ASSERT (VM_GET_CONTEXT_TYPE (stack_top_p[-1]) == VM_CONTEXT_TRY
|| VM_GET_CONTEXT_TYPE (stack_top_p[-1]) == VM_CONTEXT_FINALLY_RETURN);
if (VM_GET_CONTEXT_TYPE (stack_top_p[-1]) == VM_CONTEXT_TRY)
{
left_value = ECMA_VALUE_UNDEFINED;
}
JERRY_ASSERT (context_type == VM_CONTEXT_TRY || context_type == VM_CONTEXT_FINALLY_RETURN);
ecma_fulfill_promise (result, left_value);
}
@@ -3835,10 +3838,11 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
JERRY_ASSERT (lex_env_p->u2.outer_reference_cp != JMEM_CP_NULL);
frame_ctx_p->lex_env_p = ECMA_GET_NON_NULL_POINTER (ecma_object_t, lex_env_p->u2.outer_reference_cp);
ecma_deref_object (lex_env_p);
stack_top_p[-1] &= (ecma_value_t) ~VM_CONTEXT_HAS_LEX_ENV;
}
VM_PLUS_EQUAL_U16 (frame_ctx_p->context_depth, PARSER_FINALLY_CONTEXT_EXTRA_STACK_ALLOCATION);
stack_top_p += PARSER_FINALLY_CONTEXT_EXTRA_STACK_ALLOCATION;
stack_top_p[-1] = VM_CREATE_CONTEXT (VM_CONTEXT_FINALLY_JUMP, branch_offset);
stack_top_p[-2] = (ecma_value_t) branch_offset;
continue;
@@ -3869,8 +3873,8 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
#endif /* ENABLED (JERRY_ESNEXT) */
VM_MINUS_EQUAL_U16 (frame_ctx_p->context_depth,
PARSER_TRY_CONTEXT_STACK_ALLOCATION);
stack_top_p -= PARSER_TRY_CONTEXT_STACK_ALLOCATION;
PARSER_FINALLY_CONTEXT_STACK_ALLOCATION);
stack_top_p -= PARSER_FINALLY_CONTEXT_STACK_ALLOCATION;
if (context_type == VM_CONTEXT_FINALLY_RETURN)
{