On Thu, 30 Sep 2021 08:31:51 GMT, Jie Fu <ji...@openjdk.org> wrote: > > `RANGEBASE` was added by > > [JDK-6500501](https://bugs.openjdk.java.net/browse/JDK-6500501) and later > > was modified by > > [JDK-8027829](https://bugs.openjdk.java.net/browse/JDK-8027829) > > Note the original comment from 6500501: > > ``` > > // The characters allowed in a class or method name. All characters > 0x7f > > // are allowed in order to handle obfuscated class files (e.g. Volano) > > ``` > > Thanks @vnkozlov for your very helpful comments. > > I have one question: how can we specify (non-ascii chars) and (non-printable > ascii chars) through `-XX:CompileCommand`? > > I just learned from https://bugs.openjdk.java.net/browse/JDK-8027829 that we > can use unicode like `\uxxxx`. But it doesn't work in my experiments. > > My example was made from: > https://bugs.openjdk.java.net/secure/attachment/17128/UnicodeIdentifierTest.java > > ``` > public class UnicodeIdentifierTest { > public static void main(String args[]) { > System.out.println("Can I use \\u0001 in identifier name? " + > (Character.isJavaIdentifierPart(1) ? "yes" : > "no")); > for (int i = 0; i < 100000; i++ ) > methodWithUnicode\u0001Char(); > > System.out.println("Can I use \\u00aa in identifier name? " + > (Character.isJavaIdentifierPart(0xaa) ? "yes" : > "no")); > for (int i = 0; i < 100000; i++ ) > methodWithUnicode\u00aaChar(); > > System.out.println("Can I use \\u006b in identifier name? " + > (Character.isJavaIdentifierPart(0x6b) ? "yes" : > "no")); > for (int i = 0; i < 100000; i++ ) > methodWithUnicode\u006bChar(); > > } > public static int a = 0; > public static void methodWithUnicode\u0001Char() { > a++; > } > > public static void methodWithUnicode\u00aaChar() { > a++; > } > > public static void methodWithUnicode\u006bChar() { > a++; > } > } > ``` > > And I tried to exclude some specific methods like this > > ``` > ${JDK}/bin/java \ > -XX:+PrintCompilation \ > -XX:CompileCommand=exclude,`echo -e > "UnicodeIdentifierTest::methodWithUnicode\u0001Char"` \ > -XX:CompileCommand=exclude,`echo -e > "UnicodeIdentifierTest.methodWithUnicode\u0001Char"` \ > > -XX:CompileCommand=exclude,"UnicodeIdentifierTest.methodWithUnicode\u0001Char" > \ > > -XX:CompileCommand=exclude,'UnicodeIdentifierTest.methodWithUnicode\u0001Char' > \ > > -XX:CompileCommand=exclude,UnicodeIdentifierTest.methodWithUnicode\u0001Char \ > -XX:CompileCommand=exclude,`echo -e > "UnicodeIdentifierTest::methodWithUnicode\u00aaChar"` \ > -XX:CompileCommand=exclude,`echo -e > "UnicodeIdentifierTest.methodWithUnicode\u00aaChar"` \ > > -XX:CompileCommand=exclude,"UnicodeIdentifierTest.methodWithUnicode\u00aaChar" > \ > > -XX:CompileCommand=exclude,'UnicodeIdentifierTest.methodWithUnicode\u00aaChar' > \ > > -XX:CompileCommand=exclude,UnicodeIdentifierTest.methodWithUnicode\u00aaChar \ > -XX:CompileCommand=exclude,`echo -e > "UnicodeIdentifierTest::methodWithUnicode\u006bChar"` \ > -XX:CompileCommand=exclude,`echo -e > "UnicodeIdentifierTest.methodWithUnicode\u006bChar"` \ > > -XX:CompileCommand=exclude,"UnicodeIdentifierTest.methodWithUnicode\u006bChar" > \ > > -XX:CompileCommand=exclude,'UnicodeIdentifierTest.methodWithUnicode\u006bChar' > \ > > -XX:CompileCommand=exclude,UnicodeIdentifierTest.methodWithUnicode\u006bChar \ > ${TEST} > ``` > > But none of them worked. > > So if there is no other way to specify a non-ascii chars, it seems safe to > remove the non-ascii code. > > If I miss something, please let me know. Thanks.
(The Chinese characters in this comment may not be displayed properly inside an e-mail reader. Please see this comment on GitHub https://github.com/openjdk/jdk/pull/5704) -XX:CompileCommand does not process \uxxxx sequences. However, if your shell's locale is UTF8, you can do something like this, by directly entering them on the command-line, without escaping with \u: public class CJK { public static void main(String args[]) { \u722a\u54c7(); } static void \u722a\u54c7() { // Chinese word for "Java" Thread.dumpStack(); } } ======= $ locale LANG=en_US.UTF-8 LANGUAGE= LC_CTYPE="en_US.UTF-8" LC_NUMERIC="en_US.UTF-8" LC_TIME="en_US.UTF-8" LC_COLLATE="en_US.UTF-8" LC_MONETARY="en_US.UTF-8" LC_MESSAGES="en_US.UTF-8" LC_PAPER="en_US.UTF-8" LC_NAME="en_US.UTF-8" LC_ADDRESS="en_US.UTF-8" LC_TELEPHONE="en_US.UTF-8" LC_MEASUREMENT="en_US.UTF-8" LC_IDENTIFICATION="en_US.UTF-8" LC_ALL= $ javac CJK.java $ java -Xcomp -XX:-BackgroundCompilation -XX:CompileCommand='compileonly,*::爪哇' -XX:+PrintCompilation -cp . CJK > log.txt java.lang.Exception: Stack trace at java.base/java.lang.Thread.dumpStack(Thread.java:1380) at CJK.爪哇 (CJK.java:7) at CJK.main(CJK.java:3) $ grep '^ ' log.txt 53 1 b 3 CJK::\u722a\u54c7 (4 bytes) 53 2 b 4 CJK::\u722a\u54c7 (4 bytes) 53 1 3 CJK::\u722a\u54c7 (4 bytes) made not entrant ------------- PR: https://git.openjdk.java.net/jdk/pull/5704
