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Fix flag handling when creating arguments objects (#4272)

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Member variables of the object must be initialized before setting the
required flags, otherwise the uninitalized values can cause problems
during garbage collection.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai daniel.batyai@h-lab.eu
This commit is contained in:
Dániel Bátyai
2020-10-08 09:58:44 +02:00
committed by GitHub
parent 148f69f4a5
commit c905c21abb
1 changed files with 4 additions and 11 deletions
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jerry-core/ecma/operations/ecma-arguments-object.c
+4 -11
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@@ -58,19 +58,10 @@ ecma_op_create_arguments_object (ecma_object_t *func_obj_p, /**< callee function
uint32_t object_size = sizeof (ecma_unmapped_arguments_t);
uint32_t saved_arg_count = JERRY_MAX (shared_p->arg_list_len, formal_params_number);
uint8_t flags = ECMA_ARGUMENTS_OBJECT_NO_FLAGS;
if (bytecode_data_p->status_flags & CBC_CODE_FLAGS_MAPPED_ARGUMENTS_NEEDED)
{
flags = ECMA_ARGUMENTS_OBJECT_MAPPED;
object_size = sizeof (ecma_mapped_arguments_t);
#if ENABLED (JERRY_SNAPSHOT_EXEC)
if (bytecode_data_p->status_flags & CBC_CODE_FLAGS_STATIC_FUNCTION)
{
flags |= ECMA_ARGUMENTS_OBJECT_STATIC_BYTECODE;
}
#endif /* ENABLED (JERRY_SNAPSHOT_EXEC) */
}
ecma_object_t *obj_p = ecma_create_object (ecma_builtin_get (ECMA_BUILTIN_ID_OBJECT_PROTOTYPE),
@@ -80,7 +71,7 @@ ecma_op_create_arguments_object (ecma_object_t *func_obj_p, /**< callee function
ecma_unmapped_arguments_t *arguments_p = (ecma_unmapped_arguments_t *) obj_p;
arguments_p->header.u.pseudo_array.type = ECMA_PSEUDO_ARRAY_ARGUMENTS;
arguments_p->header.u.pseudo_array.extra_info = flags;
arguments_p->header.u.pseudo_array.extra_info = ECMA_ARGUMENTS_OBJECT_NO_FLAGS;
arguments_p->header.u.pseudo_array.u1.formal_params_number = formal_params_number;
arguments_p->header.u.pseudo_array.u2.arguments_number = 0;
arguments_p->callee = ecma_make_object_value (func_obj_p);
@@ -104,10 +95,12 @@ ecma_op_create_arguments_object (ecma_object_t *func_obj_p, /**< callee function
ecma_mapped_arguments_t *mapped_arguments_p = (ecma_mapped_arguments_t *) obj_p;
ECMA_SET_INTERNAL_VALUE_POINTER (mapped_arguments_p->lex_env, lex_env_p);
arguments_p->header.u.pseudo_array.extra_info |= ECMA_ARGUMENTS_OBJECT_MAPPED;
#if ENABLED (JERRY_SNAPSHOT_EXEC)
if (flags & ECMA_ARGUMENTS_OBJECT_STATIC_BYTECODE)
if (bytecode_data_p->status_flags & CBC_CODE_FLAGS_STATIC_FUNCTION)
{
arguments_p->header.u.pseudo_array.extra_info |= ECMA_ARGUMENTS_OBJECT_STATIC_BYTECODE;
mapped_arguments_p->u.byte_code_p = (ecma_compiled_code_t *) bytecode_data_p;
}
else