Akos Kiss
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
112 lines
3.0 KiB
C
112 lines
3.0 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "shell.h"
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#include "jerryscript.h"
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#include "jerryscript-ext/handler.h"
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#include "jerryscript-port.h"
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/**
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* Standalone Jerry exit codes
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*/
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#define JERRY_STANDALONE_EXIT_CODE_OK (0)
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#define JERRY_STANDALONE_EXIT_CODE_FAIL (1)
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/**
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* Register a JavaScript function in the global object.
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*/
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static void
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register_js_function (const char *name_p, /**< name of the function */
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jerry_external_handler_t handler_p) /**< function callback */
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{
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jerry_value_t result_val = jerryx_handler_register_global ((const jerry_char_t *) name_p, handler_p);
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if (jerry_value_is_error (result_val))
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{
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printf ("Warning: failed to register '%s' method.", name_p);
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}
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jerry_release_value (result_val);
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} /* register_js_function */
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/**
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* Jerryscript simple test
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*/
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int test_jerry (int argc, char **argv)
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{
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/* Suppress compiler errors */
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(void) argc;
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(void) argv;
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jerry_value_t ret_value = jerry_create_undefined ();
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const jerry_char_t script[] = "print ('Hello, World!');";
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printf ("This test run the following script code: [%s]\n\n", script);
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/* Initialize engine */
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jerry_init (JERRY_INIT_EMPTY);
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/* Register the print function in the global object. */
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register_js_function ("print", jerryx_handler_print);
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/* Setup Global scope code */
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ret_value = jerry_parse (NULL, 0, script, sizeof (script) - 1, JERRY_PARSE_NO_OPTS);
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if (!jerry_value_is_error (ret_value))
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{
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/* Execute the parsed source code in the Global scope */
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ret_value = jerry_run (ret_value);
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}
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int ret_code = JERRY_STANDALONE_EXIT_CODE_OK;
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if (jerry_value_is_error (ret_value))
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{
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printf ("Script Error!");
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ret_code = JERRY_STANDALONE_EXIT_CODE_FAIL;
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}
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jerry_release_value (ret_value);
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/* Cleanup engine */
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jerry_cleanup ();
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return ret_code;
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} /* test_jerry */
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const shell_command_t shell_commands[] = {
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{ "test", "Jerryscript Hello World test", test_jerry },
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{ NULL, NULL, NULL }
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};
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int main (void)
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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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printf ("You are running RIOT on a(n) %s board.\n", RIOT_BOARD);
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printf ("This board features a(n) %s MCU.\n", RIOT_MCU);
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/* start the shell */
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char line_buf[SHELL_DEFAULT_BUFSIZE];
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shell_run (shell_commands, line_buf, SHELL_DEFAULT_BUFSIZE);
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return 0;
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}
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