9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.nashorn.internal.runtime;
27
28 import static jdk.nashorn.internal.parser.TokenType.EOF;
29 import jdk.nashorn.internal.parser.Lexer;
30 import jdk.nashorn.internal.parser.Token;
31 import jdk.nashorn.internal.parser.TokenStream;
32 import jdk.nashorn.internal.parser.TokenType;
33
34 /**
35 * Utilities for debugging Nashorn.
36 *
37 */
38 public final class Debug {
39 private Debug() {
40 }
41
42 /**
43 * Return the topmost JavaScript frame in a stack trace
44 * @param t throwable that contains the stack trace
45 * @return line describing the topmost JavaScript frame
46 */
47 public static String firstJSFrame(final Throwable t) {
48 for (final StackTraceElement ste : t.getStackTrace()) {
49 if (ECMAErrors.isScriptFrame(ste)) {
50 return ste.toString();
51 }
52 }
53 return "<native code>";
54 }
55
56 /**
57 * Return the topmost JavaScript frame from the current
58 * continuation
59 * @return line describing the topmost JavaScript frame
60 */
61 public static String firstJSFrame() {
62 return firstJSFrame(new Throwable());
63 }
64
65 /**
66 * Return the system identity hashcode for an object as a human readable
67 * string
68 *
69 * @param x object
70 * @return system identity hashcode as string
71 */
72 public static String id(final Object x) {
73 return String.format("0x%08x", System.identityHashCode(x));
74 }
75
76 /**
77 * Same as {@link Debug#id} but returns the identity hashcode as
78 * an integer
79 *
80 * @param x object
81 * @return system identity hashcode
82 */
|
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.nashorn.internal.runtime;
27
28 import static jdk.nashorn.internal.parser.TokenType.EOF;
29
30 import jdk.nashorn.api.scripting.NashornException;
31 import jdk.nashorn.internal.parser.Lexer;
32 import jdk.nashorn.internal.parser.Token;
33 import jdk.nashorn.internal.parser.TokenStream;
34 import jdk.nashorn.internal.parser.TokenType;
35
36 /**
37 * Utilities for debugging Nashorn.
38 *
39 */
40 public final class Debug {
41 private Debug() {
42 }
43
44 /**
45 * Return the topmost JavaScript frame in a stack trace
46 * @param t throwable that contains the stack trace
47 * @return line describing the topmost JavaScript frame
48 */
49 public static String firstJSFrame(final Throwable t) {
50 for (final StackTraceElement ste : t.getStackTrace()) {
51 if (ECMAErrors.isScriptFrame(ste)) {
52 return ste.toString();
53 }
54 }
55 return "<native code>";
56 }
57
58 /**
59 * Return the topmost JavaScript frame from the current
60 * continuation
61 * @return line describing the topmost JavaScript frame
62 */
63 public static String firstJSFrame() {
64 return firstJSFrame(new Throwable());
65 }
66
67 /**
68 * Return a formatted script stack trace string with frames information separated by '\n'.
69 * This is a shortcut for {@code NashornException.getScriptStackString(new Throwable())}.
70 * @return formatted stack trace string
71 */
72 public static String scriptStack() {
73 return NashornException.getScriptStackString(new Throwable());
74 }
75
76 /**
77 * Return the system identity hashcode for an object as a human readable
78 * string
79 *
80 * @param x object
81 * @return system identity hashcode as string
82 */
83 public static String id(final Object x) {
84 return String.format("0x%08x", System.identityHashCode(x));
85 }
86
87 /**
88 * Same as {@link Debug#id} but returns the identity hashcode as
89 * an integer
90 *
91 * @param x object
92 * @return system identity hashcode
93 */
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