8005810: Update Hotspot Serviceability Agent for Method Parameter Reflection and Generic Type Signature Data

Hotspot was updated to store method parameter reflection and generic type signature data at runtime.  Serviceability agent support was updated for this data

Reviewed-by: coleenp, minqi, sla

hotspot/agent/src/share/classes/sun/jvm/hotspot/oops/ConstMethod.java

@@ -51,6 +51,7 @@ public class ConstMethod extends VMObject {
   private static int HAS_GENERIC_SIGNATURE;
   private static int HAS_METHOD_ANNOTATIONS;
   private static int HAS_PARAMETER_ANNOTATIONS;
+  private static int HAS_METHOD_PARAMETERS;
   private static int HAS_DEFAULT_ANNOTATIONS;
   private static int HAS_TYPE_ANNOTATIONS;
 
@@ -70,6 +71,7 @@ public class ConstMethod extends VMObject {
     HAS_GENERIC_SIGNATURE     = db.lookupIntConstant("ConstMethod::_has_generic_signature").intValue();
     HAS_METHOD_ANNOTATIONS    = db.lookupIntConstant("ConstMethod::_has_method_annotations").intValue();
     HAS_PARAMETER_ANNOTATIONS = db.lookupIntConstant("ConstMethod::_has_parameter_annotations").intValue();
+    HAS_METHOD_PARAMETERS = db.lookupIntConstant("ConstMethod::_has_method_parameters").intValue();
     HAS_DEFAULT_ANNOTATIONS   = db.lookupIntConstant("ConstMethod::_has_default_annotations").intValue();
     HAS_TYPE_ANNOTATIONS      = db.lookupIntConstant("ConstMethod::_has_type_annotations").intValue();
 
@@ -85,6 +87,9 @@ public class ConstMethod extends VMObject {
     // start of byte code
     bytecodeOffset = type.getSize();
 
+    type                       = db.lookupType("MethodParametersElement");
+    methodParametersElementSize = type.getSize();
+
     type                       = db.lookupType("CheckedExceptionElement");
     checkedExceptionElementSize = type.getSize();
 
@@ -113,7 +118,7 @@ public class ConstMethod extends VMObject {
 
   // start of bytecode
   private static long bytecodeOffset;
-
+  private static long methodParametersElementSize;
   private static long checkedExceptionElementSize;
   private static long localVariableTableElementSize;
   private static long exceptionTableElementSize;
@@ -387,6 +392,10 @@ public class ConstMethod extends VMObject {
     return ret;
   }
 
+  private boolean hasMethodParameters() {
+    return (getFlags() & HAS_METHOD_PARAMETERS) != 0;
+  }
+
   private boolean hasGenericSignature() {
     return (getFlags() & HAS_GENERIC_SIGNATURE) != 0;
   }
@@ -442,11 +451,41 @@ public class ConstMethod extends VMObject {
     return offsetOfLastU2Element();
   }
 
-  private long offsetOfCheckedExceptionsLength() {
+  private long offsetOfMethodParametersLength() {
+    if (Assert.ASSERTS_ENABLED) {
+      Assert.that(hasMethodParameters(), "should only be called if table is present");
+    }
     return hasGenericSignature() ? offsetOfLastU2Element() - sizeofShort :
                                    offsetOfLastU2Element();
   }
 
+  private int getMethodParametersLength() {
+      if (hasMethodParameters())
+          return (int) getAddress().getCIntegerAt(offsetOfMethodParametersLength(), 2, true);
+      else
+          return 0;
+  }
+
+  // Offset of start of checked exceptions
+  private long offsetOfMethodParameters() {
+    long offset = offsetOfMethodParametersLength();
+    long length = getMethodParametersLength();
+    if (Assert.ASSERTS_ENABLED) {
+      Assert.that(length > 0, "should only be called if method parameter information is present");
+    }
+    offset -= length * methodParametersElementSize;
+    return offset;
+  }
+
+  private long offsetOfCheckedExceptionsLength() {
+    if (hasMethodParameters())
+      return offsetOfMethodParameters() - sizeofShort;
+    else {
+      return hasGenericSignature() ? offsetOfLastU2Element() - sizeofShort :
+                                     offsetOfLastU2Element();
+    }
+  }
+
   private int getCheckedExceptionsLength() {
     if (hasCheckedExceptions()) {
       return (int) getAddress().getCIntegerAt(offsetOfCheckedExceptionsLength(), 2, true);
@@ -496,6 +535,8 @@ public class ConstMethod extends VMObject {
       return offsetOfExceptionTable() - sizeofShort;
     } else if (hasCheckedExceptions()) {
       return offsetOfCheckedExceptions() - sizeofShort;
+    } else if (hasMethodParameters()) {
+      return offsetOfMethodParameters() - sizeofShort;
     } else {
       return hasGenericSignature() ? offsetOfLastU2Element() - sizeofShort :
                                      offsetOfLastU2Element();
@@ -526,6 +567,8 @@ public class ConstMethod extends VMObject {
     }
     if (hasCheckedExceptions()) {
       return offsetOfCheckedExceptions() - sizeofShort;
+    } else if (hasMethodParameters()) {
+      return offsetOfMethodParameters() - sizeofShort;
     } else {
       return hasGenericSignature() ? offsetOfLastU2Element() - sizeofShort :
                                      offsetOfLastU2Element();

hotspot/src/share/vm/runtime/vmStructs.cpp

@@ -1465,6 +1465,7 @@ typedef BinaryTreeDictionary<Metablock, FreeList> MetablockTreeDictionary;
   declare_toplevel_type(CheckedExceptionElement)                          \
   declare_toplevel_type(LocalVariableTableElement)                        \
   declare_toplevel_type(ExceptionTableElement)                            \
+  declare_toplevel_type(MethodParametersElement)                          \
                                                                           \
   declare_toplevel_type(ClassLoaderData)                                  \
   declare_toplevel_type(ClassLoaderDataGraph)                             \
@@ -2337,6 +2338,7 @@ typedef BinaryTreeDictionary<Metablock, FreeList> MetablockTreeDictionary;
   declare_constant(ConstMethod::_has_localvariable_table)                 \
   declare_constant(ConstMethod::_has_exception_table)                     \
   declare_constant(ConstMethod::_has_generic_signature)                   \
+  declare_constant(ConstMethod::_has_method_parameters)                   \
   declare_constant(ConstMethod::_has_method_annotations)                  \
   declare_constant(ConstMethod::_has_parameter_annotations)               \
   declare_constant(ConstMethod::_has_default_annotations)                 \