java较新的版本OpenJdk19+GDB

#apt-get insatll openjdk-18-jdk  //先下一个bootstrap引导后续
#unzip -x jdk-jdk-19-36.zip
#cd jdk-jdk-19-36
#.config
#make all

#./java --version
openjdk 19-internal 2022-09-20
OpenJDK Runtime Environment (build 19-internal-adhoc.tang.jdk-jdk-19-36)
OpenJDK 64-Bit Server VM (build 19-internal-adhoc.tang.jdk-jdk-19-36, mixed mode)

#cd jdk-jdk-19-36/build/linux-x86_64-server-release/jdk/bin
#vim javahello.java
public class javahello {
    public static void main(String[] args) {
         System.out.println("Hello World!");
    }
}
#./javac javahello.java
#./java  javahello
# ./java javahello
Hello World!

#cd jdk-jdk-19-36/build/linux-x86_64-server-release/jdk/bin
# gdb --args ./java javahello
GNU gdb (Ubuntu 12.1-0ubuntu1~22.04) 12.1
Copyright (C) 2022 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./java...
Reading symbols from /home/tang/jdk-jdk-19-36/build/linux-x86_64-server-release/jdk/bin/java.debuginfo...

(gdb) b main
Breakpoint 1 at 0x1180: file src/java.base/share/native/launcher/main.c, line 98.
(gdb) r
Starting program: /home/tang/jdk-jdk-19-36/build/linux-x86_64-server-release/jdk/bin/java javahello
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Breakpoint 1, main (argc=2, argv=0x7fffffffdf48) at src/java.base/share/native/launcher/main.c:98
warning: Source file is more recent than executable.
98	{

cd jdk-jdk-19-36/build/linux-x86_64-server-release/jdk/bin
cp -r /home/tang/jdk-jdk-19-36/src/ .

cd jdk-jdk-19-36/build/linux-x86_64-server-release/jdk/bin/src/java.base/share/native/launcher
vim main.c

main(int argc, char **argv)
{
    int margc;
    char** margv;
    int jargc;
    char** jargv;
    const jboolean const_javaw = JNI_FALSE;
#endif /* JAVAW */
    {
        int i, main_jargc, extra_jargc;
        JLI_List list;

        main_jargc = (sizeof(const_jargs) / sizeof(char *)) > 1
            ? sizeof(const_jargs) / sizeof(char *)
            : 0; // ignore the null terminator index

        extra_jargc = (sizeof(const_extra_jargs) / sizeof(char *)) > 1
            ? sizeof(const_extra_jargs) / sizeof(char *)
            : 0; // ignore the null terminator index

        if (main_jargc > 0 && extra_jargc > 0) { // combine extra java args
            jargc = main_jargc + extra_jargc;
            list = JLI_List_new(jargc + 1);

            for (i = 0 ; i < extra_jargc; i++) {
                JLI_List_add(list, JLI_StringDup(const_extra_jargs[i]));
            }
                                                                   95,1          49%
}