69     private final StackWalker walker;
  70     private final boolean extended;
  71     LocalsAndOperands(StackWalker walker, boolean extended) {
  72         this.walker = walker;
  73         this.extended = extended;
  74     }
  75 
  76     synchronized void test() throws Exception {
  77         int x = 10;
  78         char c = 'z';
  79         String hi = "himom";
  80         long l = 1000000L;
  81         double d =  3.1415926;
  82 
  83         List<StackWalker.StackFrame> frames = walker.walk(s -> s.collect(Collectors.toList()));
  84         if (extended) {
  85             for (StackWalker.StackFrame f : frames) {
  86                 System.out.println("frame: " + f);
  87                 Object[] locals = (Object[]) getLocals.invoke(f);
  88                 for (int i = 0; i < locals.length; i++) {
  89                     System.out.format("local %d: %s type %s%n", i, locals[i], type(locals[i]));








  90                 }
  91 
  92                 Object[] operands = (Object[]) getOperands.invoke(f);
  93                 for (int i = 0; i < operands.length; i++) {
  94                     System.out.format("operand %d: %s type %s%n", i, operands[i], type(operands[i]));

  95                 }
  96 
  97                 Object[] monitors = (Object[]) getMonitors.invoke(f);
  98                 for (int i = 0; i < monitors.length; i++) {
  99                     System.out.format("monitor %d: %s%n", i, monitors[i]);
 100                 }
 101             }
 102         } else {
 103             for (StackFrame f : frames) {
 104                 if (liveStackFrameClass.isInstance(f))
 105                     throw new RuntimeException("should not be LiveStackFrame");
 106             }
 107         }
 108     }



 109 
 110     String type(Object o) throws Exception {
 111         if (primitiveValueClass.isInstance(o)) {


 112             char c = (char)primitiveType.invoke(o);
 113             return String.valueOf(c);
 114         } else {
 115             return o.getClass().getName();
 116         }
 117     }
 118 }

  69     private final StackWalker walker;
  70     private final boolean extended;
  71     LocalsAndOperands(StackWalker walker, boolean extended) {
  72         this.walker = walker;
  73         this.extended = extended;
  74     }
  75 
  76     synchronized void test() throws Exception {
  77         int x = 10;
  78         char c = 'z';
  79         String hi = "himom";
  80         long l = 1000000L;
  81         double d =  3.1415926;
  82 
  83         List<StackWalker.StackFrame> frames = walker.walk(s -> s.collect(Collectors.toList()));
  84         if (extended) {
  85             for (StackWalker.StackFrame f : frames) {
  86                 System.out.println("frame: " + f);
  87                 Object[] locals = (Object[]) getLocals.invoke(f);
  88                 for (int i = 0; i < locals.length; i++) {
  89                     System.out.format("  local %d: %s type %s\n", i, locals[i], type(locals[i]));
  90 
  91                     // check for non-null locals in LocalsAndOperands.test()
  92                     if (f.getClassName().equals("LocalsAndOperands") &&
  93                             f.getMethodName().equals("test")) {
  94                         if (locals[i] == null) {
  95                             throw new RuntimeException("kept-alive locals should not be null");
  96                         }
  97                     }
  98                 }
  99 
 100                 Object[] operands = (Object[]) getOperands.invoke(f);
 101                 for (int i = 0; i < operands.length; i++) {
 102                     System.out.format("  operand %d: %s type %s%n", i, operands[i],
 103                                       type(operands[i]));
 104                 }
 105 
 106                 Object[] monitors = (Object[]) getMonitors.invoke(f);
 107                 for (int i = 0; i < monitors.length; i++) {
 108                     System.out.format("  monitor %d: %s%n", i, monitors[i]);
 109                 }
 110             }
 111         } else {
 112             for (StackFrame f : frames) {
 113                 if (liveStackFrameClass.isInstance(f)) {
 114                     throw new RuntimeException("should not be LiveStackFrame");
 115                 }
 116             }
 117         }
 118         // Use local variables so they stay alive
 119         System.out.println("Stayin' alive: "+x+" "+c+" "+hi+" "+l+" "+d);
 120     }
 121 
 122     String type(Object o) throws Exception {
 123         if (o == null) {
 124             return "null";
 125         } else if (primitiveValueClass.isInstance(o)) {
 126             char c = (char)primitiveType.invoke(o);
 127             return String.valueOf(c);
 128         } else {
 129             return o.getClass().getName();
 130         }
 131     }
 132 }