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--- java [2020/09/26 12:18] – removed ealmr
+++ java [2025/03/30 12:30] (current) – ealmr
@@ Line 1: / Line 1: @@
+====== Build ======
+<code>
+  hg clone http://hg.openjdk.java.net/jdk8u/jdk8u/
+  cd jdk8u
+  sh ./get_source.sh
+  sh ./configure --with-debug-level=slowdebug --disable-zip-debug-info
+</code>
+====== Options ======
+  * - -XX:+UnlockExperimentalVMOptions
+  * - -Xprintflags
+  * - -XX+PrintFlagsWithComments
+  * - -XX:+PrintFlagsInitial
+  * - -XX:+PrintFlagsFinal
+  * - -XX:+CountBytecodes
+  * - -XX:+PrintBytecodeHistogram
+  * - -XX:+Printinterpreter
+  * - -XX:+TraceBytecodes
+  * - -XX:StopInterpreterAt=<num printed by -XX:+TraceBytecodes>
+  *   - set `b breakpoint` at GDB
+  * - -XX:CompileCommand="break <className:method>"
+  * - -XX:CompileCommand="print <className:method>"
+====== Template Intepreter ======
+This requires hsdis:
+<code>
+  cd hotspot/src/share/tools/hsdis/
+  wget http://ftp.gnu.org/gnu/binutils/binutils-2.33.1.tar.xz
+  tar xvf binutils-2.33.1.tar.xz
+  make all64 BINUTILS=binutils-2.33.1
+  cp build/linux-amd64/hsdis-amd64.so /same/path/to/libjvm.so
+  ./java -XX:+PrintInterpreter Hello
+</code>
+====== GDB ======
+  * - `call help()`
+  * - `call pns($sp, $rbp, $pc)`
+====== Reference ======
+http://www.progdoc.de/papers/JavaOne2014/javaone2014_con3138.html