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https://github.com/jerryscript-project/jerryscript.git
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f29e6f9020
Overflows in conversions from floating-point to integer are undefined behavior in the C99 standard. (Clause 6.3.1.4: "If the value of the integral part cannot be represented by the integer type, the behavior is undefined.") When UBSAN is enabled, this gets reported at `srand()` calls. (The random seed is usually initialized using the date port API, which represents dates as `double`s. But `srand` takes an `unsigned int`. A simple cast from `double` to `unsigned` becomes undefined behavior if the value is too large. And "now" is too large nowadays. So, effectively, all executions start with an undefined behavior.) This patch fixes this by casting the floating-point value of the date to an integer through a union. JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu
101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/* Copyright JS Foundation and other contributors, http://js.foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "jerry_extapi.h"
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#include "jerry_run.h"
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#include "jerryscript.h"
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#include "jerryscript-port.h"
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static const char* fn_sys_loop_name = "sysloop";
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void js_entry ()
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{
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union { double d; unsigned u; } now = { .d = jerry_port_get_current_time () };
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srand (now.u);
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jerry_init (JERRY_INIT_EMPTY);
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js_register_functions ();
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}
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int js_eval (const char *source_p, const size_t source_size)
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{
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jerry_value_t res = jerry_eval ((jerry_char_t *) source_p,
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source_size,
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JERRY_PARSE_NO_OPTS);
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if (jerry_value_is_error (res)) {
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jerry_release_value (res);
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return -1;
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}
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jerry_release_value (res);
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return 0;
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}
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int js_loop (uint32_t ticknow)
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{
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jerry_value_t global_obj_val = jerry_get_global_object ();
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jerry_value_t prop_name_val = jerry_create_string ((const jerry_char_t *) fn_sys_loop_name);
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jerry_value_t sysloop_func = jerry_get_property (global_obj_val, prop_name_val);
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jerry_release_value (prop_name_val);
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if (jerry_value_is_error (sysloop_func)) {
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printf ("Error: '%s' not defined!!!\r\n", fn_sys_loop_name);
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jerry_release_value (sysloop_func);
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jerry_release_value (global_obj_val);
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return -1;
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}
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if (!jerry_value_is_function (sysloop_func)) {
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printf ("Error: '%s' is not a function!!!\r\n", fn_sys_loop_name);
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jerry_release_value (sysloop_func);
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jerry_release_value (global_obj_val);
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return -2;
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}
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jerry_value_t val_args[] = { jerry_create_number (ticknow) };
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uint16_t val_argv = sizeof (val_args) / sizeof (jerry_value_t);
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jerry_value_t res = jerry_call_function (sysloop_func,
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global_obj_val,
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val_args,
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val_argv);
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for (uint16_t i = 0; i < val_argv; i++) {
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jerry_release_value (val_args[i]);
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}
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jerry_release_value (sysloop_func);
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jerry_release_value (global_obj_val);
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if (jerry_value_is_error (res)) {
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jerry_release_value (res);
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return -3;
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}
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jerry_release_value (res);
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return 0;
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}
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void js_exit (void)
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{
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jerry_cleanup ();
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}
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