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BTrace: A safe, dynamic tracing tool for the Java platform

There is a newer version: 2.2.5

#! /bin/sh

if [ -z "$BTRACE_HOME" -o ! -d "$BTRACE_HOME" ]; then
  # resolve links - $0 could be a link to btrace's home
  PRG="$0"
  progname=$(basename "$0")
  PRG=$(readlink "$PRG")

  if [ -z "$PRG" ]; then
    PRG=$0
  fi
  BTRACE_HOME=$(dirname "$PRG")/..
  BTRACE_HOME=$(cd "$BTRACE_HOME" && pwd)
fi

JAVA_ARGS="-XX:+IgnoreUnrecognizedVMOptions"
if [ -d "${JAVA_HOME}/jmods" ]; then
  JAVA_ARGS="$JAVA_ARGS -XX:+AllowRedefinitionToAddDeleteMethods"
  JAVA_ARGS="$JAVA_ARGS --add-exports jdk.internal.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED"
fi

if [ -f "${BTRACE_HOME}/libs/btrace-client.jar" ]; then
  if [ -d "${JAVA_HOME}" ]; then
    if [ "$1" = "--version" ]; then
      ${JAVA_HOME}/bin/java ${JAVA_ARGS} -cp ${BTRACE_HOME}/libs/btrace-client.jar org.openjdk.btrace.client.Main --version
      exit 0
    fi
    TOOLS_JAR="$JAVA_HOME/lib/tools.jar"

    if [ ! -f "$TOOLS_JAR" ]; then
      # probably running on JRE - try to localize JDK
      TOOLS_JAR="$JAVA_HOME/../lib/tools.jar"
    fi

    if [ ! -f "${TOOLS_JAR}" ] && [ ! -d "${JAVA_HOME}/jmods" ]; then
      # old Java versions on MacOS don't have tools.jar at all
      case "$(uname)" in
      Darwin*)
        if [ -f /System/Library/Frameworks/JavaVM.framework/Versions/${JAVA_VERSION}/Classes/classes.jar ]; then
          TOOLS_JAR="/System/Library/Frameworks/JavaVM.framework/Versions/${JAVA_VERSION}/Classes/classes.jar"
        else
          TOOLS_JAR="${JAVA_HOME}/lib/tools.jar"
        fi
        ;;
      *)
        TOOLS_JAR="${JAVA_HOME}/lib/tools.jar"
        ;;
      esac
    fi
    if [ ! -f "${TOOLS_JAR}" ] && [ ! -d "${JAVA_HOME}/jmods" ]; then
      # in non-jigsaw world TOOLS_JAR must point to a valid file
      echo "Unable to locate tools.jar. Please, make sure JAVA_HOME points to a valid JDK installation"
      exit 1
    fi

    ${JAVA_HOME}/bin/java ${JAVA_ARGS} -cp ${BTRACE_HOME}/libs/btrace-client.jar:${TOOLS_JAR} org.openjdk.btrace.client.ProbePrinter $*
  else
    echo "Please set a valid JAVA_HOME before running this script"
    exit 1
  fi
else
  echo "Please set BTRACE_HOME before running this script"
  exit 1
fi