1/* Copyright JS Foundation and other contributors, http://js.foundation
2 *
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#include "ecma-array-object.h"
17#include "ecma-helpers.h"
18#include "ecma-objects.h"
19#include "jcontext.h"
20#include "lit-char-helpers.h"
21#include "vm.h"
22
23/**
24 * Check whether currently executed code is strict mode code
25 *
26 * @return true - current code is executed in strict mode,
27 *         false - otherwise
28 */
29bool
30vm_is_strict_mode (void)
31{
32  JERRY_ASSERT (JERRY_CONTEXT (vm_top_context_p) != NULL);
33
34  return JERRY_CONTEXT (vm_top_context_p)->bytecode_header_p->status_flags & CBC_CODE_FLAGS_STRICT_MODE;
35} /* vm_is_strict_mode */
36
37/**
38 * Check whether currently performed call (on top of call-stack) is performed in form,
39 * meeting conditions of 'Direct Call to Eval' (see also: ECMA-262 v5, 15.1.2.1.1)
40 *
41 * Warning:
42 *         the function should only be called from implementation
43 *         of built-in 'eval' routine of Global object
44 *
45 * @return true - currently performed call is performed through 'eval' identifier,
46 *                without 'this' argument,
47 *         false - otherwise
48 */
49inline bool JERRY_ATTR_ALWAYS_INLINE
50vm_is_direct_eval_form_call (void)
51{
52  return (JERRY_CONTEXT (status_flags) & ECMA_STATUS_DIRECT_EVAL) != 0;
53} /* vm_is_direct_eval_form_call */
54
55#if defined(JERRY_FUNCTION_BACKTRACE) && !defined(__APPLE__)
56static ecma_string_t*
57vm_get_function_name_string (vm_frame_ctx_t *context_p)
58{
59  ecma_stringbuilder_t func_name_builder;
60  if (context_p->prev_context_p != NULL) {
61    vm_frame_ctx_t* prev_ctx_p = context_p->prev_context_p;
62    ecma_object_t* func_obj = ecma_get_object_from_value (prev_ctx_p->callee_value);
63    ecma_object_type_t func_obj_type = ecma_get_object_type (func_obj);
64    if (func_obj_type == ECMA_OBJECT_TYPE_FUNCTION
65	|| func_obj_type == ECMA_OBJECT_TYPE_EXTERNAL_FUNCTION
66	|| func_obj_type == ECMA_OBJECT_TYPE_BOUND_FUNCTION) {
67      ecma_string_t* name_prop = ecma_get_magic_string (LIT_MAGIC_STRING_NAME);
68      ecma_value_t func_name_value = ecma_op_object_get (func_obj, name_prop);
69      if (func_name_value == ECMA_VALUE_UNDEFINED) {
70        func_name_builder = ecma_stringbuilder_create_raw ((lit_utf8_byte_t *) ("<unknown>"), 9);
71      } else {
72        func_name_builder = ecma_stringbuilder_create_from(ecma_get_string_from_value (func_name_value));
73      }
74      ecma_deref_ecma_string (name_prop);
75    } else {
76      func_name_builder = ecma_stringbuilder_create_raw ((lit_utf8_byte_t *) ("<erroneous>"), 11);
77    }
78  } else {
79    func_name_builder = ecma_stringbuilder_create_raw ((lit_utf8_byte_t *) ("<GLOBAL>"), 8);
80  }
81  ecma_string_t* lbracket = ecma_new_ecma_string_from_utf8((const lit_utf8_byte_t *) ("("), 1);
82  ecma_string_t* rbracket = ecma_new_ecma_string_from_utf8((const lit_utf8_byte_t *) (")"), 1);
83  ecma_stringbuilder_append (&func_name_builder, lbracket);
84  ecma_stringbuilder_append (&func_name_builder, rbracket);
85  ecma_stringbuilder_append_byte (&func_name_builder, LIT_CHAR_COMMA);
86  ecma_stringbuilder_append_byte (&func_name_builder, LIT_CHAR_SP);
87  ecma_deref_ecma_string(rbracket);
88  ecma_deref_ecma_string(lbracket);
89  return ecma_stringbuilder_finalize (&func_name_builder);
90}
91#endif
92
93/**
94 * Get backtrace. The backtrace is an array of strings where
95 * each string contains the position of the corresponding frame.
96 * The array length is zero if the backtrace is not available.
97 *
98 * @return array ecma value
99 */
100ecma_value_t
101vm_get_backtrace (uint32_t max_depth) /**< maximum backtrace depth, 0 = unlimited */
102{
103#if ENABLED (JERRY_LINE_INFO)
104  ecma_value_t result_array = ecma_op_create_array_object (NULL, 0, false);
105
106  if (max_depth == 0)
107  {
108    max_depth = UINT32_MAX;
109  }
110
111  vm_frame_ctx_t *context_p = JERRY_CONTEXT (vm_top_context_p);
112  ecma_object_t *array_p = ecma_get_object_from_value (result_array);
113  JERRY_ASSERT (ecma_op_object_is_fast_array (array_p));
114  uint32_t index = 0;
115
116  while (context_p != NULL)
117  {
118    ecma_string_t *str_p = ecma_get_magic_string (LIT_MAGIC_STRING__EMPTY);
119
120#if defined(JERRY_FUNCTION_BACKTRACE) && !defined(__APPLE__)
121    ecma_string_t* func_name = vm_get_function_name_string (context_p);
122    func_name = ecma_concat_ecma_strings (func_name, str_p);
123
124    ecma_fast_array_set_property (array_p, index, ecma_make_string_value (func_name));
125    ecma_deref_ecma_string(str_p);
126    ecma_deref_ecma_string(func_name);
127#else
128    ecma_fast_array_set_property (array_p, index, ecma_make_string_value (str_p));
129    ecma_deref_ecma_string (str_p);
130#endif
131
132    context_p = context_p->prev_context_p;
133    index++;
134
135    if (index >= max_depth)
136    {
137      break;
138    }
139  }
140
141  return result_array;
142#else /* !ENABLED (JERRY_LINE_INFO) */
143  JERRY_UNUSED (max_depth);
144
145  return ecma_op_create_array_object (NULL, 0, false);
146#endif /* ENABLED (JERRY_LINE_INFO) */
147} /* vm_get_backtrace */
148