changeset 48471:1703d83b3ffe

8058259: compute_offset() is confusing for static fields Summary: remove most hard-coded offsets, have compute_offset function that takes a string and creates a TempNewSymbol, have static_field_addr() not add in InstanceMirrorKlass::offset_of_static_fields, ie use offset from find_field Reviewed-by: kbarrett, sspitsyn
author coleenp
date Mon, 08 Jan 2018 09:46:31 -0500
parents c39ae979ca35
children 7f97d35fac6e
files src/hotspot/share/classfile/javaClasses.cpp src/hotspot/share/classfile/javaClasses.hpp src/hotspot/share/classfile/systemDictionary.hpp src/hotspot/share/classfile/vmSymbols.hpp src/hotspot/share/jvmci/jvmciJavaClasses.hpp src/hotspot/share/oops/instanceKlass.cpp src/hotspot/share/runtime/arguments.cpp src/hotspot/share/runtime/globals.hpp src/hotspot/share/runtime/init.cpp
diffstat 9 files changed, 215 insertions(+), 451 deletions(-) [+]
line wrap: on
line diff
--- a/src/hotspot/share/classfile/javaClasses.cpp	Mon Jan 08 13:22:05 2018 +0100
+++ b/src/hotspot/share/classfile/javaClasses.cpp	Mon Jan 08 09:46:31 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -33,6 +33,8 @@
 #include "code/dependencyContext.hpp"
 #include "code/pcDesc.hpp"
 #include "interpreter/interpreter.hpp"
+#include "logging/log.hpp"
+#include "logging/logStream.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/resourceArea.hpp"
 #include "memory/universe.inline.hpp"
@@ -104,52 +106,59 @@
 }
 
 
-static bool find_field(InstanceKlass* ik,
-                       Symbol* name_symbol, Symbol* signature_symbol,
-                       fieldDescriptor* fd,
-                       bool is_static = false, bool allow_super = false) {
-  if (allow_super || is_static) {
-    return ik->find_field(name_symbol, signature_symbol, is_static, fd) != NULL;
-  } else {
-    return ik->find_local_field(name_symbol, signature_symbol, fd);
+// Helpful routine for computing field offsets at run time rather than hardcoding them
+// Finds local fields only, including static fields.  Static field offsets are from the
+// beginning of the mirror.
+static void compute_offset(int &dest_offset,
+                           InstanceKlass* ik, Symbol* name_symbol, Symbol* signature_symbol,
+                           bool is_static = false) {
+  fieldDescriptor fd;
+  if (ik == NULL) {
+    ResourceMark rm;
+    log_error(class)("Mismatch JDK version for field: %s type: %s", name_symbol->as_C_string(), signature_symbol->as_C_string());
+    vm_exit_during_initialization("Invalid layout of preloaded class");
   }
-}
-
-// Helpful routine for computing field offsets at run time rather than hardcoding them
-static void
-compute_offset(int &dest_offset,
-               Klass* klass, Symbol* name_symbol, Symbol* signature_symbol,
-               bool is_static = false, bool allow_super = false) {
-  fieldDescriptor fd;
-  InstanceKlass* ik = InstanceKlass::cast(klass);
-  if (!find_field(ik, name_symbol, signature_symbol, &fd, is_static, allow_super)) {
+
+  if (!ik->find_local_field(name_symbol, signature_symbol, &fd) || fd.is_static() != is_static) {
     ResourceMark rm;
-    tty->print_cr("Invalid layout of %s at %s", ik->external_name(), name_symbol->as_C_string());
+    log_error(class)("Invalid layout of %s field: %s type: %s", ik->external_name(),
+                     name_symbol->as_C_string(), signature_symbol->as_C_string());
 #ifndef PRODUCT
-    ik->print();
-    tty->print_cr("all fields:");
-    for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
-      tty->print_cr("  name: %s, sig: %s, flags: %08x", fs.name()->as_C_string(), fs.signature()->as_C_string(), fs.access_flags().as_int());
-    }
+    // Prints all fields and offsets
+    Log(class) lt;
+    LogStream ls(lt.error());
+    ik->print_on(&ls);
 #endif //PRODUCT
     vm_exit_during_initialization("Invalid layout of preloaded class: use -Xlog:class+load=info to see the origin of the problem class");
   }
   dest_offset = fd.offset();
 }
 
+// Overloading to pass name as a string.
+static void compute_offset(int& dest_offset, InstanceKlass* ik,
+                           const char* name_string, Symbol* signature_symbol,
+                           bool is_static = false) {
+  TempNewSymbol name = SymbolTable::probe(name_string, (int)strlen(name_string));
+  if (name == NULL) {
+    ResourceMark rm;
+    log_error(class)("Name %s should be in the SymbolTable since its class is loaded", name_string);
+    vm_exit_during_initialization("Invalid layout of preloaded class", ik->external_name());
+  }
+  compute_offset(dest_offset, ik, name, signature_symbol, is_static);
+}
+
 // Same as above but for "optional" offsets that might not be present in certain JDK versions
+// Old versions should be cleaned out since Hotspot only supports the current JDK, and this
+// function should be removed.
 static void
 compute_optional_offset(int& dest_offset,
-                        Klass* klass, Symbol* name_symbol, Symbol* signature_symbol,
-                        bool allow_super = false) {
+                        InstanceKlass* ik, Symbol* name_symbol, Symbol* signature_symbol) {
   fieldDescriptor fd;
-  InstanceKlass* ik = InstanceKlass::cast(klass);
-  if (find_field(ik, name_symbol, signature_symbol, &fd, allow_super)) {
+  if (ik->find_local_field(name_symbol, signature_symbol, &fd)) {
     dest_offset = fd.offset();
   }
 }
 
-
 int java_lang_String::value_offset  = 0;
 int java_lang_String::hash_offset   = 0;
 int java_lang_String::coder_offset  = 0;
@@ -163,10 +172,10 @@
 void java_lang_String::compute_offsets() {
   assert(!initialized, "offsets should be initialized only once");
 
-  Klass* k = SystemDictionary::String_klass();
+  InstanceKlass* k = SystemDictionary::String_klass();
   compute_offset(value_offset,           k, vmSymbols::value_name(),  vmSymbols::byte_array_signature());
-  compute_offset(hash_offset,            k, vmSymbols::hash_name(),   vmSymbols::int_signature());
-  compute_offset(coder_offset,           k, vmSymbols::coder_name(),  vmSymbols::byte_signature());
+  compute_offset(hash_offset,            k, "hash",   vmSymbols::int_signature());
+  compute_offset(coder_offset,           k, "coder",  vmSymbols::byte_signature());
 
   initialized = true;
 }
@@ -1161,25 +1170,11 @@
   assert(!offsets_computed, "offsets should be initialized only once");
   offsets_computed = true;
 
-  Klass* k = SystemDictionary::Class_klass();
-  // The classRedefinedCount field is only present starting in 1.5,
-  // so don't go fatal.
-  compute_optional_offset(classRedefinedCount_offset,
-                          k, vmSymbols::classRedefinedCount_name(), vmSymbols::int_signature());
-
-  // Needs to be optional because the old build runs Queens during bootstrapping
-  // and jdk8-9 doesn't have coordinated pushes yet.
-  compute_optional_offset(_class_loader_offset,
-                 k, vmSymbols::classLoader_name(),
-                 vmSymbols::classloader_signature());
-
-  compute_offset(_component_mirror_offset,
-                 k, vmSymbols::componentType_name(),
-                 vmSymbols::class_signature());
-
-  compute_offset(_module_offset,
-                 k, vmSymbols::module_name(),
-                 vmSymbols::module_signature());
+  InstanceKlass* k = SystemDictionary::Class_klass();
+  compute_offset(classRedefinedCount_offset, k, "classRedefinedCount", vmSymbols::int_signature());
+  compute_offset(_class_loader_offset,       k, "classLoader", vmSymbols::classloader_signature());
+  compute_offset(_component_mirror_offset,   k, "componentType", vmSymbols::class_signature());
+  compute_offset(_module_offset,             k, "module", vmSymbols::module_signature());
 
   // Init lock is a C union with component_mirror.  Only instanceKlass mirrors have
   // init_lock and only ArrayKlass mirrors have component_mirror.  Since both are oops
@@ -1234,24 +1229,22 @@
 void java_lang_Thread::compute_offsets() {
   assert(_group_offset == 0, "offsets should be initialized only once");
 
-  Klass* k = SystemDictionary::Thread_klass();
+  InstanceKlass* k = SystemDictionary::Thread_klass();
   compute_offset(_name_offset,      k, vmSymbols::name_name(),      vmSymbols::string_signature());
   compute_offset(_group_offset,     k, vmSymbols::group_name(),     vmSymbols::threadgroup_signature());
-  compute_offset(_contextClassLoader_offset, k, vmSymbols::contextClassLoader_name(), vmSymbols::classloader_signature());
-  compute_offset(_inheritedAccessControlContext_offset, k, vmSymbols::inheritedAccessControlContext_name(), vmSymbols::accesscontrolcontext_signature());
+  compute_offset(_contextClassLoader_offset, k, vmSymbols::contextClassLoader_name(),
+                 vmSymbols::classloader_signature());
+  compute_offset(_inheritedAccessControlContext_offset, k, vmSymbols::inheritedAccessControlContext_name(),
+                 vmSymbols::accesscontrolcontext_signature());
   compute_offset(_priority_offset,  k, vmSymbols::priority_name(),  vmSymbols::int_signature());
   compute_offset(_daemon_offset,    k, vmSymbols::daemon_name(),    vmSymbols::bool_signature());
-  compute_offset(_eetop_offset,     k, vmSymbols::eetop_name(),     vmSymbols::long_signature());
-  compute_offset(_stillborn_offset, k, vmSymbols::stillborn_name(), vmSymbols::bool_signature());
-  // The stackSize field is only present starting in 1.4, so don't go fatal.
-  compute_optional_offset(_stackSize_offset, k, vmSymbols::stackSize_name(), vmSymbols::long_signature());
-  // The tid and thread_status fields are only present starting in 1.5, so don't go fatal.
-  compute_optional_offset(_tid_offset, k, vmSymbols::thread_id_name(), vmSymbols::long_signature());
-  compute_optional_offset(_thread_status_offset, k, vmSymbols::thread_status_name(), vmSymbols::int_signature());
-  // The parkBlocker field is only present starting in 1.6, so don't go fatal.
-  compute_optional_offset(_park_blocker_offset, k, vmSymbols::park_blocker_name(), vmSymbols::object_signature());
-  compute_optional_offset(_park_event_offset, k, vmSymbols::park_event_name(),
- vmSymbols::long_signature());
+  compute_offset(_eetop_offset,     k, "eetop", vmSymbols::long_signature());
+  compute_offset(_stillborn_offset, k, "stillborn", vmSymbols::bool_signature());
+  compute_offset(_stackSize_offset, k, "stackSize", vmSymbols::long_signature());
+  compute_offset(_tid_offset,       k, "tid", vmSymbols::long_signature());
+  compute_offset(_thread_status_offset, k, "threadStatus", vmSymbols::int_signature());
+  compute_offset(_park_blocker_offset,  k, "parkBlocker", vmSymbols::object_signature());
+  compute_offset(_park_event_offset,    k, "nativeParkEventPointer", vmSymbols::long_signature());
 }
 
 
@@ -1486,7 +1479,7 @@
 void java_lang_ThreadGroup::compute_offsets() {
   assert(_parent_offset == 0, "offsets should be initialized only once");
 
-  Klass* k = SystemDictionary::ThreadGroup_klass();
+  InstanceKlass* k = SystemDictionary::ThreadGroup_klass();
 
   compute_offset(_parent_offset,      k, vmSymbols::parent_name(),      vmSymbols::threadgroup_signature());
   compute_offset(_name_offset,        k, vmSymbols::name_name(),        vmSymbols::string_signature());
@@ -1501,8 +1494,13 @@
 
 
 void java_lang_Throwable::compute_offsets() {
-  Klass* k = SystemDictionary::Throwable_klass();
-  compute_offset(depth_offset, k, vmSymbols::depth_name(), vmSymbols::int_signature());
+  InstanceKlass* k = SystemDictionary::Throwable_klass();
+  compute_offset(backtrace_offset,     k, "backtrace", vmSymbols::object_signature());
+  compute_offset(detailMessage_offset, k, "detailMessage", vmSymbols::string_signature());
+  compute_offset(stackTrace_offset,    k, "stackTrace",    vmSymbols::java_lang_StackTraceElement_array());
+  compute_offset(depth_offset,         k, "depth", vmSymbols::int_signature());
+  compute_offset(static_unassigned_stacktrace_offset, k, "UNASSIGNED_STACK", vmSymbols::java_lang_StackTraceElement_array(),
+                 /*is_static*/true);
 }
 
 oop java_lang_Throwable::unassigned_stacktrace() {
@@ -2270,23 +2268,23 @@
 }
 
 void java_lang_StackFrameInfo::compute_offsets() {
-  Klass* k = SystemDictionary::StackFrameInfo_klass();
-  compute_offset(_memberName_offset,     k, vmSymbols::memberName_name(),  vmSymbols::object_signature());
-  compute_offset(_bci_offset,            k, vmSymbols::bci_name(),         vmSymbols::short_signature());
+  InstanceKlass* k = SystemDictionary::StackFrameInfo_klass();
+  compute_offset(_memberName_offset,     k, "memberName",  vmSymbols::object_signature());
+  compute_offset(_bci_offset,            k, "bci",         vmSymbols::short_signature());
   STACKFRAMEINFO_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
 }
 
 void java_lang_LiveStackFrameInfo::compute_offsets() {
-  Klass* k = SystemDictionary::LiveStackFrameInfo_klass();
-  compute_offset(_monitors_offset,   k, vmSymbols::monitors_name(),    vmSymbols::object_array_signature());
-  compute_offset(_locals_offset,     k, vmSymbols::locals_name(),      vmSymbols::object_array_signature());
-  compute_offset(_operands_offset,   k, vmSymbols::operands_name(),    vmSymbols::object_array_signature());
-  compute_offset(_mode_offset,       k, vmSymbols::mode_name(),        vmSymbols::int_signature());
+  InstanceKlass* k = SystemDictionary::LiveStackFrameInfo_klass();
+  compute_offset(_monitors_offset,   k, "monitors",    vmSymbols::object_array_signature());
+  compute_offset(_locals_offset,     k, "locals",      vmSymbols::object_array_signature());
+  compute_offset(_operands_offset,   k, "operands",    vmSymbols::object_array_signature());
+  compute_offset(_mode_offset,       k, "mode",        vmSymbols::int_signature());
 }
 
 void java_lang_reflect_AccessibleObject::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_AccessibleObject_klass();
-  compute_offset(override_offset, k, vmSymbols::override_name(), vmSymbols::bool_signature());
+  InstanceKlass* k = SystemDictionary::reflect_AccessibleObject_klass();
+  compute_offset(override_offset, k, "override", vmSymbols::bool_signature());
 }
 
 jboolean java_lang_reflect_AccessibleObject::override(oop reflect) {
@@ -2300,7 +2298,7 @@
 }
 
 void java_lang_reflect_Method::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_Method_klass();
+  InstanceKlass* k = SystemDictionary::reflect_Method_klass();
   compute_offset(clazz_offset,          k, vmSymbols::clazz_name(),          vmSymbols::class_signature());
   compute_offset(name_offset,           k, vmSymbols::name_name(),           vmSymbols::string_signature());
   compute_offset(returnType_offset,     k, vmSymbols::returnType_name(),     vmSymbols::class_signature());
@@ -2481,7 +2479,7 @@
 }
 
 void java_lang_reflect_Constructor::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_Constructor_klass();
+  InstanceKlass* k = SystemDictionary::reflect_Constructor_klass();
   compute_offset(clazz_offset,          k, vmSymbols::clazz_name(),          vmSymbols::class_signature());
   compute_offset(parameterTypes_offset, k, vmSymbols::parameterTypes_name(), vmSymbols::class_array_signature());
   compute_offset(exceptionTypes_offset, k, vmSymbols::exceptionTypes_name(), vmSymbols::class_array_signature());
@@ -2623,7 +2621,7 @@
 }
 
 void java_lang_reflect_Field::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_Field_klass();
+  InstanceKlass* k = SystemDictionary::reflect_Field_klass();
   compute_offset(clazz_offset,     k, vmSymbols::clazz_name(),     vmSymbols::class_signature());
   compute_offset(name_offset,      k, vmSymbols::name_name(),      vmSymbols::string_signature());
   compute_offset(type_offset,      k, vmSymbols::type_name(),      vmSymbols::class_signature());
@@ -2747,22 +2745,17 @@
 }
 
 void reflect_ConstantPool::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_ConstantPool_klass();
-  // This null test can be removed post beta
-  if (k != NULL) {
-    // The field is called ConstantPool* in the sun.reflect.ConstantPool class.
-    compute_offset(_oop_offset, k, vmSymbols::ConstantPool_name(), vmSymbols::object_signature());
-  }
+  InstanceKlass* k = SystemDictionary::reflect_ConstantPool_klass();
+  // The field is called ConstantPool* in the sun.reflect.ConstantPool class.
+  compute_offset(_oop_offset, k, "constantPoolOop", vmSymbols::object_signature());
 }
 
 void java_lang_reflect_Parameter::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_Parameter_klass();
-  if(NULL != k) {
-    compute_offset(name_offset,        k, vmSymbols::name_name(),        vmSymbols::string_signature());
-    compute_offset(modifiers_offset,   k, vmSymbols::modifiers_name(),   vmSymbols::int_signature());
-    compute_offset(index_offset,       k, vmSymbols::index_name(),       vmSymbols::int_signature());
-    compute_offset(executable_offset,  k, vmSymbols::executable_name(),  vmSymbols::executable_signature());
-  }
+  InstanceKlass* k = SystemDictionary::reflect_Parameter_klass();
+  compute_offset(name_offset,        k, vmSymbols::name_name(),        vmSymbols::string_signature());
+  compute_offset(modifiers_offset,   k, vmSymbols::modifiers_name(),   vmSymbols::int_signature());
+  compute_offset(index_offset,       k, vmSymbols::index_name(),       vmSymbols::int_signature());
+  compute_offset(executable_offset,  k, vmSymbols::executable_name(),  vmSymbols::executable_signature());
 }
 
 Handle java_lang_reflect_Parameter::create(TRAPS) {
@@ -2836,12 +2829,10 @@
 }
 
 void java_lang_Module::compute_offsets() {
-  Klass* k = SystemDictionary::Module_klass();
-  if(NULL != k) {
-    compute_offset(loader_offset,  k, vmSymbols::loader_name(),  vmSymbols::classloader_signature());
-    compute_offset(name_offset,    k, vmSymbols::name_name(),    vmSymbols::string_signature());
-    MODULE_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
-  }
+  InstanceKlass* k = SystemDictionary::Module_klass();
+  compute_offset(loader_offset,  k, vmSymbols::loader_name(),  vmSymbols::classloader_signature());
+  compute_offset(name_offset,    k, vmSymbols::name_name(),    vmSymbols::string_signature());
+  MODULE_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
 }
 
 
@@ -2921,12 +2912,8 @@
 }
 
 void reflect_UnsafeStaticFieldAccessorImpl::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_UnsafeStaticFieldAccessorImpl_klass();
-  // This null test can be removed post beta
-  if (k != NULL) {
-    compute_offset(_base_offset, k,
-                   vmSymbols::base_name(), vmSymbols::object_signature());
-  }
+  InstanceKlass* k = SystemDictionary::reflect_UnsafeStaticFieldAccessorImpl_klass();
+  compute_offset(_base_offset, k, "base", vmSymbols::object_signature());
 }
 
 oop java_lang_boxing_object::initialize_and_allocate(BasicType type, TRAPS) {
@@ -3084,6 +3071,13 @@
 }
 
 // Support for java_lang_ref_SoftReference
+//
+
+void java_lang_ref_SoftReference::compute_offsets() {
+  InstanceKlass* k = SystemDictionary::SoftReference_klass();
+  compute_offset(timestamp_offset,    k, "timestamp", vmSymbols::long_signature());
+  compute_offset(static_clock_offset, k, "clock",     vmSymbols::long_signature(), true);
+}
 
 jlong java_lang_ref_SoftReference::timestamp(oop ref) {
   return ref->long_field(timestamp_offset);
@@ -3113,10 +3107,8 @@
 }
 
 void java_lang_invoke_DirectMethodHandle::compute_offsets() {
-  Klass* k = SystemDictionary::DirectMethodHandle_klass();
-  if (k != NULL) {
-    compute_offset(_member_offset, k, vmSymbols::member_name(), vmSymbols::java_lang_invoke_MemberName_signature());
-  }
+  InstanceKlass* k = SystemDictionary::DirectMethodHandle_klass();
+  compute_offset(_member_offset, k, "member", vmSymbols::java_lang_invoke_MemberName_signature());
 }
 
 // Support for java_lang_invoke_MethodHandle
@@ -3137,16 +3129,13 @@
 int java_lang_invoke_LambdaForm::_vmentry_offset;
 
 void java_lang_invoke_MethodHandle::compute_offsets() {
-  Klass* k = SystemDictionary::MethodHandle_klass();
-  if (k != NULL) {
-    compute_offset(_type_offset, k, vmSymbols::type_name(), vmSymbols::java_lang_invoke_MethodType_signature());
-    compute_offset(_form_offset, k, vmSymbols::form_name(), vmSymbols::java_lang_invoke_LambdaForm_signature());
-  }
+  InstanceKlass* k = SystemDictionary::MethodHandle_klass();
+  compute_offset(_type_offset, k, vmSymbols::type_name(), vmSymbols::java_lang_invoke_MethodType_signature());
+  compute_offset(_form_offset, k, "form", vmSymbols::java_lang_invoke_LambdaForm_signature());
 }
 
 void java_lang_invoke_MemberName::compute_offsets() {
-  Klass* k = SystemDictionary::MemberName_klass();
-  assert (k != NULL, "jdk mismatch");
+  InstanceKlass* k = SystemDictionary::MemberName_klass();
   compute_offset(_clazz_offset,   k, vmSymbols::clazz_name(),   vmSymbols::class_signature());
   compute_offset(_name_offset,    k, vmSymbols::name_name(),    vmSymbols::string_signature());
   compute_offset(_type_offset,    k, vmSymbols::type_name(),    vmSymbols::object_signature());
@@ -3156,15 +3145,15 @@
 }
 
 void java_lang_invoke_ResolvedMethodName::compute_offsets() {
-  Klass* k = SystemDictionary::ResolvedMethodName_klass();
+  InstanceKlass* k = SystemDictionary::ResolvedMethodName_klass();
   assert(k != NULL, "jdk mismatch");
   RESOLVEDMETHOD_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
 }
 
 void java_lang_invoke_LambdaForm::compute_offsets() {
-  Klass* k = SystemDictionary::LambdaForm_klass();
+  InstanceKlass* k = SystemDictionary::LambdaForm_klass();
   assert (k != NULL, "jdk mismatch");
-  compute_offset(_vmentry_offset, k, vmSymbols::vmentry_name(), vmSymbols::java_lang_invoke_MemberName_signature());
+  compute_offset(_vmentry_offset, k, "vmentry", vmSymbols::java_lang_invoke_MemberName_signature());
 }
 
 bool java_lang_invoke_LambdaForm::is_instance(oop obj) {
@@ -3305,11 +3294,9 @@
 int java_lang_invoke_MethodType::_ptypes_offset;
 
 void java_lang_invoke_MethodType::compute_offsets() {
-  Klass* k = SystemDictionary::MethodType_klass();
-  if (k != NULL) {
-    compute_offset(_rtype_offset,  k, vmSymbols::rtype_name(),  vmSymbols::class_signature());
-    compute_offset(_ptypes_offset, k, vmSymbols::ptypes_name(), vmSymbols::class_array_signature());
-  }
+  InstanceKlass* k = SystemDictionary::MethodType_klass();
+  compute_offset(_rtype_offset,  k, "rtype",  vmSymbols::class_signature());
+  compute_offset(_ptypes_offset, k, "ptypes", vmSymbols::class_array_signature());
 }
 
 void java_lang_invoke_MethodType::print_signature(oop mt, outputStream* st) {
@@ -3392,12 +3379,10 @@
 int java_lang_invoke_CallSite::_context_offset;
 
 void java_lang_invoke_CallSite::compute_offsets() {
-  Klass* k = SystemDictionary::CallSite_klass();
-  if (k != NULL) {
-    compute_offset(_target_offset, k, vmSymbols::target_name(), vmSymbols::java_lang_invoke_MethodHandle_signature());
-    compute_offset(_context_offset, k, vmSymbols::context_name(),
-                   vmSymbols::java_lang_invoke_MethodHandleNatives_CallSiteContext_signature());
-  }
+  InstanceKlass* k = SystemDictionary::CallSite_klass();
+  compute_offset(_target_offset,  k, "target", vmSymbols::java_lang_invoke_MethodHandle_signature());
+  compute_offset(_context_offset, k, "context",
+                 vmSymbols::java_lang_invoke_MethodHandleNatives_CallSiteContext_signature());
 }
 
 oop java_lang_invoke_CallSite::context(oop call_site) {
@@ -3412,10 +3397,8 @@
 int java_lang_invoke_MethodHandleNatives_CallSiteContext::_vmdependencies_offset;
 
 void java_lang_invoke_MethodHandleNatives_CallSiteContext::compute_offsets() {
-  Klass* k = SystemDictionary::Context_klass();
-  if (k != NULL) {
-    CALLSITECONTEXT_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
-  }
+  InstanceKlass* k = SystemDictionary::Context_klass();
+  CALLSITECONTEXT_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
 }
 
 DependencyContext java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(oop call_site) {
@@ -3434,28 +3417,12 @@
 
 void java_security_AccessControlContext::compute_offsets() {
   assert(_isPrivileged_offset == 0, "offsets should be initialized only once");
-  fieldDescriptor fd;
-  InstanceKlass* ik = SystemDictionary::AccessControlContext_klass();
-
-  if (!ik->find_local_field(vmSymbols::context_name(), vmSymbols::protectiondomain_signature(), &fd)) {
-    fatal("Invalid layout of java.security.AccessControlContext");
-  }
-  _context_offset = fd.offset();
-
-  if (!ik->find_local_field(vmSymbols::privilegedContext_name(), vmSymbols::accesscontrolcontext_signature(), &fd)) {
-    fatal("Invalid layout of java.security.AccessControlContext");
-  }
-  _privilegedContext_offset = fd.offset();
-
-  if (!ik->find_local_field(vmSymbols::isPrivileged_name(), vmSymbols::bool_signature(), &fd)) {
-    fatal("Invalid layout of java.security.AccessControlContext");
-  }
-  _isPrivileged_offset = fd.offset();
-
-  // The offset may not be present for bootstrapping with older JDK.
-  if (ik->find_local_field(vmSymbols::isAuthorized_name(), vmSymbols::bool_signature(), &fd)) {
-    _isAuthorized_offset = fd.offset();
-  }
+  InstanceKlass* k = SystemDictionary::AccessControlContext_klass();
+
+  compute_offset(_context_offset,           k, "context",      vmSymbols::protectiondomain_signature());
+  compute_offset(_privilegedContext_offset, k, "privilegedContext", vmSymbols::accesscontrolcontext_signature());
+  compute_offset(_isPrivileged_offset,      k, "isPrivileged", vmSymbols::bool_signature());
+  compute_offset(_isAuthorized_offset,      k, "isAuthorized", vmSymbols::bool_signature());
 }
 
 
@@ -3504,16 +3471,17 @@
   assert(!offsets_computed, "offsets should be initialized only once");
   offsets_computed = true;
 
-  // The field indicating parallelCapable (parallelLockMap) is only present starting in 7,
-  Klass* k1 = SystemDictionary::ClassLoader_klass();
-  compute_optional_offset(parallelCapable_offset,
-    k1, vmSymbols::parallelCapable_name(), vmSymbols::concurrenthashmap_signature());
+  InstanceKlass* k1 = SystemDictionary::ClassLoader_klass();
+  compute_offset(parallelCapable_offset,
+    k1, "parallelLockMap", vmSymbols::concurrenthashmap_signature());
 
   compute_offset(name_offset,
     k1, vmSymbols::name_name(), vmSymbols::string_signature());
 
   compute_offset(unnamedModule_offset,
-    k1, vmSymbols::unnamedModule_name(), vmSymbols::module_signature());
+    k1, "unnamedModule", vmSymbols::module_signature());
+
+  compute_offset(parent_offset, k1, "parent", vmSymbols::classloader_signature());
 
   CLASSLOADER_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
 }
@@ -3600,19 +3568,18 @@
 }
 
 // Support for java_lang_System
-int java_lang_System::in_offset_in_bytes() {
-  return (InstanceMirrorKlass::offset_of_static_fields() + static_in_offset);
-}
-
-
-int java_lang_System::out_offset_in_bytes() {
-  return (InstanceMirrorKlass::offset_of_static_fields() + static_out_offset);
-}
-
-
-int java_lang_System::err_offset_in_bytes() {
-  return (InstanceMirrorKlass::offset_of_static_fields() + static_err_offset);
-}
+//
+void java_lang_System::compute_offsets() {
+  InstanceKlass* k = SystemDictionary::System_klass();
+  compute_offset(static_in_offset,  k, "in",  vmSymbols::input_stream_signature(), true);
+  compute_offset(static_out_offset, k, "out", vmSymbols::print_stream_signature(), true);
+  compute_offset(static_err_offset, k, "err", vmSymbols::print_stream_signature(), true);
+  compute_offset(static_security_offset, k, "security", vmSymbols::security_manager_signature(), true);
+}
+
+int java_lang_System::in_offset_in_bytes() { return static_in_offset; }
+int java_lang_System::out_offset_in_bytes() { return static_out_offset; }
+int java_lang_System::err_offset_in_bytes() { return static_err_offset; }
 
 
 bool java_lang_System::has_security_manager() {
@@ -3682,7 +3649,6 @@
 int java_lang_ref_Reference::queue_offset;
 int java_lang_ref_Reference::next_offset;
 int java_lang_ref_Reference::discovered_offset;
-int java_lang_ref_Reference::number_of_fake_oop_fields;
 int java_lang_ref_SoftReference::timestamp_offset;
 int java_lang_ref_SoftReference::static_clock_offset;
 int java_lang_ClassLoader::parent_offset;
@@ -3717,6 +3683,17 @@
 
 
 // Support for java_lang_StackTraceElement
+void java_lang_StackTraceElement::compute_offsets() {
+  InstanceKlass* k = SystemDictionary::StackTraceElement_klass();
+  compute_offset(declaringClassObject_offset,  k, "declaringClassObject", vmSymbols::class_signature());
+  compute_offset(classLoaderName_offset, k, "classLoaderName", vmSymbols::string_signature());
+  compute_offset(moduleName_offset,      k, "moduleName",      vmSymbols::string_signature());
+  compute_offset(moduleVersion_offset,   k, "moduleVersion",   vmSymbols::string_signature());
+  compute_offset(declaringClass_offset,  k, "declaringClass",  vmSymbols::string_signature());
+  compute_offset(methodName_offset,      k, "methodName",      vmSymbols::string_signature());
+  compute_offset(fileName_offset,        k, "fileName",        vmSymbols::string_signature());
+  compute_offset(lineNumber_offset,      k, "lineNumber",      vmSymbols::int_signature());
+}
 
 void java_lang_StackTraceElement::set_fileName(oop element, oop value) {
   element->obj_field_put(fileName_offset, value);
@@ -3776,6 +3753,16 @@
 
 // Support for java Assertions - java_lang_AssertionStatusDirectives.
 
+void java_lang_AssertionStatusDirectives::compute_offsets() {
+  InstanceKlass* k = SystemDictionary::AssertionStatusDirectives_klass();
+  compute_offset(classes_offset,        k, "classes",        vmSymbols::string_array_signature());
+  compute_offset(classEnabled_offset,   k, "classEnabled",   vmSymbols::bool_array_signature());
+  compute_offset(packages_offset,       k, "packages",       vmSymbols::string_array_signature());
+  compute_offset(packageEnabled_offset, k, "packageEnabled", vmSymbols::bool_array_signature());
+  compute_offset(deflt_offset,          k, "deflt",          vmSymbols::bool_signature());
+}
+
+
 void java_lang_AssertionStatusDirectives::set_classes(oop o, oop val) {
   o->obj_field_put(classes_offset, val);
 }
@@ -3804,18 +3791,18 @@
 
 
 void java_nio_Buffer::compute_offsets() {
-  Klass* k = SystemDictionary::nio_Buffer_klass();
+  InstanceKlass* k = SystemDictionary::nio_Buffer_klass();
   assert(k != NULL, "must be loaded in 1.4+");
-  compute_offset(_limit_offset, k, vmSymbols::limit_name(), vmSymbols::int_signature());
+  compute_offset(_limit_offset, k, "limit", vmSymbols::int_signature());
 }
 
 void java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(TRAPS) {
   if (_owner_offset != 0) return;
 
   SystemDictionary::load_abstract_ownable_synchronizer_klass(CHECK);
-  Klass* k = SystemDictionary::abstract_ownable_synchronizer_klass();
+  InstanceKlass* k = SystemDictionary::abstract_ownable_synchronizer_klass();
   compute_offset(_owner_offset, k,
-                 vmSymbols::exclusive_owner_thread_name(), vmSymbols::thread_signature());
+                 "exclusiveOwnerThread", vmSymbols::thread_signature());
 }
 
 oop java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(oop obj) {
@@ -3823,71 +3810,37 @@
   return obj->obj_field(_owner_offset);
 }
 
+static int member_offset(int hardcoded_offset) {
+  return (hardcoded_offset * heapOopSize) + instanceOopDesc::base_offset_in_bytes();
+}
+
 // Compute hard-coded offsets
 // Invoked before SystemDictionary::initialize, so pre-loaded classes
 // are not available to determine the offset_of_static_fields.
 void JavaClasses::compute_hard_coded_offsets() {
-  const int x = heapOopSize;
-  const int header = instanceOopDesc::base_offset_in_bytes();
-
-  // Throwable Class
-  java_lang_Throwable::backtrace_offset  = java_lang_Throwable::hc_backtrace_offset  * x + header;
-  java_lang_Throwable::detailMessage_offset = java_lang_Throwable::hc_detailMessage_offset * x + header;
-  java_lang_Throwable::stackTrace_offset = java_lang_Throwable::hc_stackTrace_offset * x + header;
-  java_lang_Throwable::static_unassigned_stacktrace_offset = java_lang_Throwable::hc_static_unassigned_stacktrace_offset *  x;
 
   // java_lang_boxing_object
-  java_lang_boxing_object::value_offset = java_lang_boxing_object::hc_value_offset + header;
-  java_lang_boxing_object::long_value_offset = align_up((java_lang_boxing_object::hc_value_offset + header), BytesPerLong);
-
-  // java_lang_ref_Reference:
-  java_lang_ref_Reference::referent_offset = java_lang_ref_Reference::hc_referent_offset * x + header;
-  java_lang_ref_Reference::queue_offset = java_lang_ref_Reference::hc_queue_offset * x + header;
-  java_lang_ref_Reference::next_offset  = java_lang_ref_Reference::hc_next_offset * x + header;
-  java_lang_ref_Reference::discovered_offset  = java_lang_ref_Reference::hc_discovered_offset * x + header;
-  // Artificial fields for java_lang_ref_Reference
-  // The first field is for the discovered field added in 1.4
-  java_lang_ref_Reference::number_of_fake_oop_fields = 1;
-
-  // java_lang_ref_SoftReference Class
-  java_lang_ref_SoftReference::timestamp_offset = align_up((java_lang_ref_SoftReference::hc_timestamp_offset * x + header), BytesPerLong);
-  // Don't multiply static fields because they are always in wordSize units
-  java_lang_ref_SoftReference::static_clock_offset = java_lang_ref_SoftReference::hc_static_clock_offset * x;
-
-  // java_lang_ClassLoader
-  java_lang_ClassLoader::parent_offset = java_lang_ClassLoader::hc_parent_offset * x + header;
-
-  // java_lang_System
-  java_lang_System::static_in_offset  = java_lang_System::hc_static_in_offset  * x;
-  java_lang_System::static_out_offset = java_lang_System::hc_static_out_offset * x;
-  java_lang_System::static_err_offset = java_lang_System::hc_static_err_offset * x;
-  java_lang_System::static_security_offset = java_lang_System::hc_static_security_offset * x;
-
-  // java_lang_StackTraceElement
-  java_lang_StackTraceElement::declaringClassObject_offset = java_lang_StackTraceElement::hc_declaringClassObject_offset * x + header;
-  java_lang_StackTraceElement::classLoaderName_offset = java_lang_StackTraceElement::hc_classLoaderName_offset * x + header;
-  java_lang_StackTraceElement::moduleName_offset = java_lang_StackTraceElement::hc_moduleName_offset * x + header;
-  java_lang_StackTraceElement::moduleVersion_offset = java_lang_StackTraceElement::hc_moduleVersion_offset * x + header;
-  java_lang_StackTraceElement::declaringClass_offset = java_lang_StackTraceElement::hc_declaringClass_offset  * x + header;
-  java_lang_StackTraceElement::methodName_offset = java_lang_StackTraceElement::hc_methodName_offset * x + header;
-  java_lang_StackTraceElement::fileName_offset   = java_lang_StackTraceElement::hc_fileName_offset   * x + header;
-  java_lang_StackTraceElement::lineNumber_offset = java_lang_StackTraceElement::hc_lineNumber_offset * x + header;
-  java_lang_AssertionStatusDirectives::classes_offset = java_lang_AssertionStatusDirectives::hc_classes_offset * x + header;
-  java_lang_AssertionStatusDirectives::classEnabled_offset = java_lang_AssertionStatusDirectives::hc_classEnabled_offset * x + header;
-  java_lang_AssertionStatusDirectives::packages_offset = java_lang_AssertionStatusDirectives::hc_packages_offset * x + header;
-  java_lang_AssertionStatusDirectives::packageEnabled_offset = java_lang_AssertionStatusDirectives::hc_packageEnabled_offset * x + header;
-  java_lang_AssertionStatusDirectives::deflt_offset = java_lang_AssertionStatusDirectives::hc_deflt_offset * x + header;
-
+  java_lang_boxing_object::value_offset      = member_offset(java_lang_boxing_object::hc_value_offset);
+  java_lang_boxing_object::long_value_offset = align_up(member_offset(java_lang_boxing_object::hc_value_offset), BytesPerLong);
+
+  // java_lang_ref_Reference
+  java_lang_ref_Reference::referent_offset    = member_offset(java_lang_ref_Reference::hc_referent_offset);
+  java_lang_ref_Reference::queue_offset       = member_offset(java_lang_ref_Reference::hc_queue_offset);
+  java_lang_ref_Reference::next_offset        = member_offset(java_lang_ref_Reference::hc_next_offset);
+  java_lang_ref_Reference::discovered_offset  = member_offset(java_lang_ref_Reference::hc_discovered_offset);
 }
 
 
 // Compute non-hard-coded field offsets of all the classes in this file
 void JavaClasses::compute_offsets() {
   // java_lang_Class::compute_offsets was called earlier in bootstrap
+  java_lang_System::compute_offsets();
   java_lang_ClassLoader::compute_offsets();
   java_lang_Throwable::compute_offsets();
   java_lang_Thread::compute_offsets();
   java_lang_ThreadGroup::compute_offsets();
+  java_lang_AssertionStatusDirectives::compute_offsets();
+  java_lang_ref_SoftReference::compute_offsets();
   java_lang_invoke_MethodHandle::compute_offsets();
   java_lang_invoke_DirectMethodHandle::compute_offsets();
   java_lang_invoke_MemberName::compute_offsets();
@@ -3910,6 +3863,7 @@
   reflect_UnsafeStaticFieldAccessorImpl::compute_offsets();
   java_lang_reflect_Parameter::compute_offsets();
   java_lang_Module::compute_offsets();
+  java_lang_StackTraceElement::compute_offsets();
   java_lang_StackFrameInfo::compute_offsets();
   java_lang_LiveStackFrameInfo::compute_offsets();
 
@@ -3947,62 +3901,6 @@
   }
 }
 
-
-bool JavaClasses::check_static_offset(const char *klass_name, int hardcoded_offset, const char *field_name, const char* field_sig) {
-  EXCEPTION_MARK;
-  fieldDescriptor fd;
-  TempNewSymbol klass_sym = SymbolTable::new_symbol(klass_name, CATCH);
-  Klass* k = SystemDictionary::resolve_or_fail(klass_sym, true, CATCH);
-  InstanceKlass* ik = InstanceKlass::cast(k);
-  TempNewSymbol f_name = SymbolTable::new_symbol(field_name, CATCH);
-  TempNewSymbol f_sig  = SymbolTable::new_symbol(field_sig, CATCH);
-  if (!ik->find_local_field(f_name, f_sig, &fd)) {
-    tty->print_cr("Static field %s.%s not found", klass_name, field_name);
-    return false;
-  }
-  if (!fd.is_static()) {
-    tty->print_cr("Static field %s.%s appears to be nonstatic", klass_name, field_name);
-    return false;
-  }
-  if (fd.offset() == hardcoded_offset + InstanceMirrorKlass::offset_of_static_fields()) {
-    return true;
-  } else {
-    tty->print_cr("Offset of static field %s.%s is hardcoded as %d but should really be %d.", klass_name, field_name, hardcoded_offset, fd.offset() - InstanceMirrorKlass::offset_of_static_fields());
-    return false;
-  }
-}
-
-
-bool JavaClasses::check_constant(const char *klass_name, int hardcoded_constant, const char *field_name, const char* field_sig) {
-  EXCEPTION_MARK;
-  fieldDescriptor fd;
-  TempNewSymbol klass_sym = SymbolTable::new_symbol(klass_name, CATCH);
-  Klass* k = SystemDictionary::resolve_or_fail(klass_sym, true, CATCH);
-  InstanceKlass* ik = InstanceKlass::cast(k);
-  TempNewSymbol f_name = SymbolTable::new_symbol(field_name, CATCH);
-  TempNewSymbol f_sig  = SymbolTable::new_symbol(field_sig, CATCH);
-  if (!ik->find_local_field(f_name, f_sig, &fd)) {
-    tty->print_cr("Static field %s.%s not found", klass_name, field_name);
-    return false;
-  }
-  if (!fd.is_static() || !fd.has_initial_value()) {
-    tty->print_cr("Static field %s.%s appears to be non-constant", klass_name, field_name);
-    return false;
-  }
-  if (!fd.initial_value_tag().is_int()) {
-    tty->print_cr("Static field %s.%s is not an int", klass_name, field_name);
-    return false;
-  }
-  jint field_value = fd.int_initial_value();
-  if (field_value == hardcoded_constant) {
-    return true;
-  } else {
-    tty->print_cr("Constant value of static field %s.%s is hardcoded as %d but should really be %d.", klass_name, field_name, hardcoded_constant, field_value);
-    return false;
-  }
-}
-
-
 // Check the hard-coded field offsets of all the classes in this file
 
 void JavaClasses::check_offsets() {
@@ -4014,31 +3912,6 @@
 #define CHECK_LONG_OFFSET(klass_name, cpp_klass_name, field_name, field_sig) \
   valid &= check_offset(klass_name, cpp_klass_name :: long_ ## field_name ## _offset, #field_name, field_sig)
 
-#define CHECK_STATIC_OFFSET(klass_name, cpp_klass_name, field_name, field_sig) \
-  valid &= check_static_offset(klass_name, cpp_klass_name :: static_ ## field_name ## _offset, #field_name, field_sig)
-
-#define CHECK_CONSTANT(klass_name, cpp_klass_name, field_name, field_sig) \
-  valid &= check_constant(klass_name, cpp_klass_name :: field_name, #field_name, field_sig)
-
-  // java.lang.String
-
-  CHECK_OFFSET("java/lang/String", java_lang_String, value, "[B");
-  CHECK_OFFSET("java/lang/String", java_lang_String, hash, "I");
-  CHECK_OFFSET("java/lang/String", java_lang_String, coder, "B");
-
-  // java.lang.Class
-
-  // Fake fields
-  // CHECK_OFFSET("java/lang/Class", java_lang_Class, klass); // %%% this needs to be checked
-  // CHECK_OFFSET("java/lang/Class", java_lang_Class, array_klass); // %%% this needs to be checked
-
-  // java.lang.Throwable
-
-  CHECK_OFFSET("java/lang/Throwable", java_lang_Throwable, backtrace, "Ljava/lang/Object;");
-  CHECK_OFFSET("java/lang/Throwable", java_lang_Throwable, detailMessage, "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/Throwable", java_lang_Throwable, stackTrace, "[Ljava/lang/StackTraceElement;");
-  CHECK_OFFSET("java/lang/Throwable", java_lang_Throwable, depth, "I");
-
   // Boxed primitive objects (java_lang_boxing_object)
 
   CHECK_OFFSET("java/lang/Boolean",   java_lang_boxing_object, value, "Z");
@@ -4050,28 +3923,6 @@
   CHECK_OFFSET("java/lang/Integer",   java_lang_boxing_object, value, "I");
   CHECK_LONG_OFFSET("java/lang/Long", java_lang_boxing_object, value, "J");
 
-  // java.lang.ClassLoader
-
-  CHECK_OFFSET("java/lang/ClassLoader", java_lang_ClassLoader, parent,        "Ljava/lang/ClassLoader;");
-
-  // java.lang.System
-
-  CHECK_STATIC_OFFSET("java/lang/System", java_lang_System,  in, "Ljava/io/InputStream;");
-  CHECK_STATIC_OFFSET("java/lang/System", java_lang_System, out, "Ljava/io/PrintStream;");
-  CHECK_STATIC_OFFSET("java/lang/System", java_lang_System, err, "Ljava/io/PrintStream;");
-  CHECK_STATIC_OFFSET("java/lang/System", java_lang_System, security, "Ljava/lang/SecurityManager;");
-
-  // java.lang.StackTraceElement
-
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, declaringClassObject, "Ljava/lang/Class;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, classLoaderName, "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, moduleName,      "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, moduleVersion,   "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, declaringClass,  "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, methodName,      "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, fileName,        "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, lineNumber,      "I");
-
   // java.lang.ref.Reference
 
   CHECK_OFFSET("java/lang/ref/Reference", java_lang_ref_Reference, referent, "Ljava/lang/Object;");
@@ -4080,28 +3931,6 @@
   // Fake field
   //CHECK_OFFSET("java/lang/ref/Reference", java_lang_ref_Reference, discovered, "Ljava/lang/ref/Reference;");
 
-  // java.lang.ref.SoftReference
-
-  CHECK_OFFSET("java/lang/ref/SoftReference", java_lang_ref_SoftReference, timestamp, "J");
-  CHECK_STATIC_OFFSET("java/lang/ref/SoftReference", java_lang_ref_SoftReference, clock, "J");
-
-  // java.lang.AssertionStatusDirectives
-  //
-  // The CheckAssertionStatusDirectives boolean can be removed from here and
-  // globals.hpp after the AssertionStatusDirectives class has been integrated
-  // into merlin "for some time."  Without it, the vm will fail with early
-  // merlin builds.
-
-  if (CheckAssertionStatusDirectives) {
-    const char* nm = "java/lang/AssertionStatusDirectives";
-    const char* sig = "[Ljava/lang/String;";
-    CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, classes, sig);
-    CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, classEnabled, "[Z");
-    CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, packages, sig);
-    CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, packageEnabled, "[Z");
-    CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, deflt, "Z");
-  }
-
   if (!valid) vm_exit_during_initialization("Hard-coded field offset verification failed");
 }
 
--- a/src/hotspot/share/classfile/javaClasses.hpp	Mon Jan 08 13:22:05 2018 +0100
+++ b/src/hotspot/share/classfile/javaClasses.hpp	Mon Jan 08 09:46:31 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -444,9 +444,6 @@
     hc_cause_offset         =  2,  // New since 1.4
     hc_stackTrace_offset    =  3   // New since 1.4
   };
-  enum {
-      hc_static_unassigned_stacktrace_offset = 0  // New since 1.7
-  };
   // Trace constants
   enum {
     trace_methods_offset = 0,
@@ -878,7 +875,6 @@
   static int queue_offset;
   static int next_offset;
   static int discovered_offset;
-  static int number_of_fake_oop_fields;
 
   // Accessors
   static inline oop referent(oop ref);
@@ -902,14 +898,6 @@
 
 class java_lang_ref_SoftReference: public java_lang_ref_Reference {
  public:
-  enum {
-   // The timestamp is a long field and may need to be adjusted for alignment.
-   hc_timestamp_offset  = hc_discovered_offset + 1
-  };
-  enum {
-   hc_static_clock_offset = 0
-  };
-
   static int timestamp_offset;
   static int static_clock_offset;
 
@@ -919,6 +907,8 @@
   // Accessors for statics
   static jlong clock();
   static void set_clock(jlong value);
+
+  static void compute_offsets();
 };
 
 // Interface to java.lang.invoke.MethodHandle objects
@@ -1228,10 +1218,6 @@
 
 class java_lang_ClassLoader : AllStatic {
  private:
-  // The fake offsets are added by the class loader when java.lang.Class is loaded
-  enum {
-   hc_parent_offset = 0
-  };
   static int _loader_data_offset;
   static bool offsets_computed;
   static int parent_offset;
@@ -1279,13 +1265,6 @@
 
 class java_lang_System : AllStatic {
  private:
-  enum {
-   hc_static_in_offset  = 0,
-   hc_static_out_offset = 1,
-   hc_static_err_offset = 2,
-   hc_static_security_offset = 3
-  };
-
   static int  static_in_offset;
   static int static_out_offset;
   static int static_err_offset;
@@ -1298,6 +1277,8 @@
 
   static bool has_security_manager();
 
+  static void compute_offsets();
+
   // Debugging
   friend class JavaClasses;
 };
@@ -1307,17 +1288,6 @@
 
 class java_lang_StackTraceElement: AllStatic {
  private:
-  enum {
-    hc_declaringClassObject_offset    = 0,
-    hc_classLoaderName_offset      = 1,
-    hc_moduleName_offset           = 2,
-    hc_moduleVersion_offset        = 3,
-    hc_declaringClass_offset       = 4,
-    hc_methodName_offset           = 5,
-    hc_fileName_offset             = 6,
-    hc_lineNumber_offset           = 7
-  };
-
   static int declaringClassObject_offset;
   static int classLoaderName_offset;
   static int moduleName_offset;
@@ -1344,6 +1314,8 @@
   static void fill_in(Handle element, InstanceKlass* holder, const methodHandle& method,
                       int version, int bci, Symbol* name, TRAPS);
 
+  static void compute_offsets();
+
   // Debugging
   friend class JavaClasses;
 };
@@ -1416,14 +1388,6 @@
 
 class java_lang_AssertionStatusDirectives: AllStatic {
  private:
-  enum {
-    hc_classes_offset,
-    hc_classEnabled_offset,
-    hc_packages_offset,
-    hc_packageEnabled_offset,
-    hc_deflt_offset
-  };
-
   static int classes_offset;
   static int classEnabled_offset;
   static int packages_offset;
@@ -1437,6 +1401,9 @@
   static void set_packages(oop obj, oop val);
   static void set_packageEnabled(oop obj, oop val);
   static void set_deflt(oop obj, bool val);
+
+  static void compute_offsets();
+
   // Debugging
   friend class JavaClasses;
 };
@@ -1508,9 +1475,6 @@
   static InjectedField _injected_fields[];
 
   static bool check_offset(const char *klass_name, int offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0;
-  static bool check_static_offset(const char *klass_name, int hardcoded_offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0;
-  static bool check_constant(const char *klass_name, int constant, const char *field_name, const char* field_sig) PRODUCT_RETURN0;
-
  public:
   enum InjectedFieldID {
     ALL_INJECTED_FIELDS(DECLARE_INJECTED_FIELD_ENUM)
--- a/src/hotspot/share/classfile/systemDictionary.hpp	Mon Jan 08 13:22:05 2018 +0100
+++ b/src/hotspot/share/classfile/systemDictionary.hpp	Mon Jan 08 09:46:31 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -173,6 +173,7 @@
   do_klass(VolatileCallSite_klass,                      java_lang_invoke_VolatileCallSite,         Pre                 ) \
   /* Note: MethodHandle must be first, and VolatileCallSite last in group */                                             \
                                                                                                                          \
+  do_klass(AssertionStatusDirectives_klass,             java_lang_AssertionStatusDirectives,       Pre                 ) \
   do_klass(StringBuffer_klass,                          java_lang_StringBuffer,                    Pre                 ) \
   do_klass(StringBuilder_klass,                         java_lang_StringBuilder,                   Pre                 ) \
   do_klass(internal_Unsafe_klass,                       jdk_internal_misc_Unsafe,                  Pre                 ) \
--- a/src/hotspot/share/classfile/vmSymbols.hpp	Mon Jan 08 13:22:05 2018 +0100
+++ b/src/hotspot/share/classfile/vmSymbols.hpp	Mon Jan 08 09:46:31 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -251,7 +251,6 @@
   template(compiledLambdaForm_name,                   "<compiledLambdaForm>")  /*fake name*/      \
   template(star_name,                                 "*") /*not really a name*/                  \
   template(invoke_name,                               "invoke")                                   \
-  template(override_name,                             "override")                                 \
   template(parameterTypes_name,                       "parameterTypes")                           \
   template(returnType_name,                           "returnType")                               \
   template(signature_name,                            "signature")                                \
@@ -265,7 +264,6 @@
   template(parameter_annotations_name,                "parameterAnnotations")                     \
   template(annotation_default_name,                   "annotationDefault")                        \
   template(reflect_ConstantPool,                      "jdk/internal/reflect/ConstantPool")        \
-  template(ConstantPool_name,                         "constantPoolOop")                          \
   template(reflect_UnsafeStaticFieldAccessorImpl,     "jdk/internal/reflect/UnsafeStaticFieldAccessorImpl")\
   template(base_name,                                 "base")                                     \
   /* Type Annotations (JDK 8 and above) */                                                        \
@@ -340,8 +338,6 @@
   template(stillborn_name,                            "stillborn")                                \
   template(group_name,                                "group")                                    \
   template(daemon_name,                               "daemon")                                   \
-  template(eetop_name,                                "eetop")                                    \
-  template(thread_status_name,                        "threadStatus")                             \
   template(run_method_name,                           "run")                                      \
   template(exit_method_name,                          "exit")                                     \
   template(add_method_name,                           "add")                                      \
@@ -375,34 +371,21 @@
   template(fillInStackTrace_name,                     "fillInStackTrace")                         \
   template(getCause_name,                             "getCause")                                 \
   template(initCause_name,                            "initCause")                                \
-  template(depth_name,                                "depth")                                    \
   template(setProperty_name,                          "setProperty")                              \
   template(getProperty_name,                          "getProperty")                              \
   template(context_name,                              "context")                                  \
-  template(privilegedContext_name,                    "privilegedContext")                        \
   template(contextClassLoader_name,                   "contextClassLoader")                       \
   template(inheritedAccessControlContext_name,        "inheritedAccessControlContext")            \
-  template(isPrivileged_name,                         "isPrivileged")                             \
-  template(isAuthorized_name,                         "isAuthorized")                             \
   template(getClassContext_name,                      "getClassContext")                          \
   template(wait_name,                                 "wait")                                     \
   template(checkPackageAccess_name,                   "checkPackageAccess")                       \
-  template(stackSize_name,                            "stackSize")                                \
-  template(thread_id_name,                            "tid")                                      \
   template(newInstance0_name,                         "newInstance0")                             \
-  template(limit_name,                                "limit")                                    \
-  template(member_name,                               "member")                                   \
   template(forName_name,                              "forName")                                  \
   template(forName0_name,                             "forName0")                                 \
   template(isJavaIdentifierStart_name,                "isJavaIdentifierStart")                    \
   template(isJavaIdentifierPart_name,                 "isJavaIdentifierPart")                     \
-  template(exclusive_owner_thread_name,               "exclusiveOwnerThread")                     \
-  template(park_blocker_name,                         "parkBlocker")                              \
-  template(park_event_name,                           "nativeParkEventPointer")                   \
   template(cache_field_name,                          "cache")                                    \
   template(value_name,                                "value")                                    \
-  template(hash_name,                                 "hash")                                     \
-  template(coder_name,                                "coder")                                    \
   template(compact_strings_name,                      "COMPACT_STRINGS")                          \
   template(numberOfLeadingZeros_name,                 "numberOfLeadingZeros")                     \
   template(numberOfTrailingZeros_name,                "numberOfTrailingZeros")                    \
@@ -419,27 +402,17 @@
   template(method_name,                               "method")                                   \
   template(vmindex_name,                              "vmindex")                                  \
   template(vmcount_name,                              "vmcount")                                  \
-  template(vmentry_name,                              "vmentry")                                  \
   template(flags_name,                                "flags")                                    \
-  template(rtype_name,                                "rtype")                                    \
-  template(ptypes_name,                               "ptypes")                                   \
-  template(form_name,                                 "form")                                     \
   template(basicType_name,                            "basicType")                                \
   template(append_name,                               "append")                                   \
   template(klass_name,                                "klass")                                    \
   template(array_klass_name,                          "array_klass")                              \
-  template(memberName_name,                           "memberName")                               \
   template(mid_name,                                  "mid")                                      \
   template(cpref_name,                                "cpref")                                    \
   template(version_name,                              "version")                                  \
-  template(bci_name,                                  "bci")                                      \
   template(methodName_name,                           "methodName")                               \
   template(fileName_name,                             "fileName")                                 \
   template(lineNumber_name,                           "lineNumber")                               \
-  template(monitors_name,                             "monitors")                                 \
-  template(locals_name,                               "locals")                                   \
-  template(operands_name,                             "operands")                                 \
-  template(mode_name,                                 "mode")                                     \
   template(oop_size_name,                             "oop_size")                                 \
   template(static_oop_field_count_name,               "static_oop_field_count")                   \
   template(protection_domain_name,                    "protection_domain")                        \
@@ -447,9 +420,11 @@
   template(loader_data_name,                          "loader_data")                              \
   template(vmdependencies_name,                       "vmdependencies")                           \
   template(loader_name,                               "loader")                                   \
-  template(module_name,                               "module")                                   \
   template(getModule_name,                            "getModule")                                \
   template(input_stream_void_signature,               "(Ljava/io/InputStream;)V")                 \
+  template(input_stream_signature,                    "Ljava/io/InputStream;")                    \
+  template(print_stream_signature,                    "Ljava/io/PrintStream;")                    \
+  template(security_manager_signature,                "Ljava/lang/SecurityManager;")              \
   template(definePackage_name,                        "definePackage")                            \
   template(definePackage_signature,                   "(Ljava/lang/String;Ljava/lang/Module;)Ljava/lang/Package;") \
   template(defineOrCheckPackage_name,                 "defineOrCheckPackage")                     \
@@ -498,6 +473,7 @@
   template(short_signature,                           "S")                                        \
   template(bool_signature,                            "Z")                                        \
   template(void_signature,                            "V")                                        \
+  template(bool_array_signature,                      "[Z")                                       \
   template(byte_array_signature,                      "[B")                                       \
   template(char_array_signature,                      "[C")                                       \
   template(int_array_signature,                       "[I")                                       \
@@ -552,6 +528,7 @@
   template(object_array_signature,                    "[Ljava/lang/Object;")                                      \
   template(class_signature,                           "Ljava/lang/Class;")                                        \
   template(string_signature,                          "Ljava/lang/String;")                                       \
+  template(string_array_signature,                    "[Ljava/lang/String;")                                      \
   template(reference_signature,                       "Ljava/lang/ref/Reference;")                                \
   template(sun_misc_Cleaner_signature,                "Lsun/misc/Cleaner;")                                       \
   template(executable_signature,                      "Ljava/lang/reflect/Executable;")                           \
@@ -578,12 +555,6 @@
   /* used by ClassFormatError when class name is not known yet */                                                 \
   template(unknown_class_name,                        "<Unknown>")                                                \
                                                                                                                   \
-  /* used to identify class loaders handling parallel class loading */                                            \
-  template(parallelCapable_name,                      "parallelLockMap")                                          \
-                                                                                                                  \
-  /* used to return a class loader's unnamed module */                                                            \
-  template(unnamedModule_name,                        "unnamedModule")                                            \
-                                                                                                                  \
   /* JVM monitoring and management support */                                                                     \
   template(java_lang_StackTraceElement_array,          "[Ljava/lang/StackTraceElement;")                          \
   template(java_lang_management_ThreadState,           "java/lang/management/ThreadState")                        \
--- a/src/hotspot/share/jvmci/jvmciJavaClasses.hpp	Mon Jan 08 13:22:05 2018 +0100
+++ b/src/hotspot/share/jvmci/jvmciJavaClasses.hpp	Mon Jan 08 09:46:31 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -351,7 +351,7 @@
     static type name() {                                                                                       \
       assert(klassName::klass() != NULL && klassName::klass()->is_linked(), "Class not yet linked: " #klassName); \
       InstanceKlass* ik = klassName::klass();                                                                  \
-      address addr = ik->static_field_addr(_##name##_offset - InstanceMirrorKlass::offset_of_static_fields()); \
+      address addr = ik->static_field_addr(_##name##_offset);                                                  \
       oop result = HeapAccess<>::oop_load((HeapWord*)addr);                                                    \
       return type(result);                                                                                     \
     }                                                                                                          \
@@ -359,7 +359,7 @@
       assert(klassName::klass() != NULL && klassName::klass()->is_linked(), "Class not yet linked: " #klassName); \
       assert(klassName::klass() != NULL, "Class not yet loaded: " #klassName);                                 \
       InstanceKlass* ik = klassName::klass();                                                                  \
-      address addr = ik->static_field_addr(_##name##_offset - InstanceMirrorKlass::offset_of_static_fields()); \
+      address addr = ik->static_field_addr(_##name##_offset);                                                  \
       HeapAccess<>::oop_store((HeapWord*)addr, x);                                                             \
     }
 #define STATIC_PRIMITIVE_FIELD(klassName, name, jtypename)                                                     \
@@ -367,13 +367,13 @@
     static jtypename name() {                                                                                  \
       assert(klassName::klass() != NULL && klassName::klass()->is_linked(), "Class not yet linked: " #klassName); \
       InstanceKlass* ik = klassName::klass();                                                                  \
-      address addr = ik->static_field_addr(_##name##_offset - InstanceMirrorKlass::offset_of_static_fields()); \
+      address addr = ik->static_field_addr(_##name##_offset);                                                  \
       return HeapAccess<>::load((jtypename*)addr);                                                             \
     }                                                                                                          \
     static void set_##name(jtypename x) {                                                                      \
       assert(klassName::klass() != NULL && klassName::klass()->is_linked(), "Class not yet linked: " #klassName); \
       InstanceKlass* ik = klassName::klass();                                                                  \
-      address addr = ik->static_field_addr(_##name##_offset - InstanceMirrorKlass::offset_of_static_fields()); \
+      address addr = ik->static_field_addr(_##name##_offset);                                                  \
       HeapAccess<>::store((jtypename*)addr, x);                                                                \
     }
 
--- a/src/hotspot/share/oops/instanceKlass.cpp	Mon Jan 08 13:22:05 2018 +0100
+++ b/src/hotspot/share/oops/instanceKlass.cpp	Mon Jan 08 09:46:31 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2265,7 +2265,8 @@
 }
 
 address InstanceKlass::static_field_addr(int offset) {
-  return (address)(offset + InstanceMirrorKlass::offset_of_static_fields() + cast_from_oop<intptr_t>(java_mirror()));
+  assert(offset >= InstanceMirrorKlass::offset_of_static_fields(), "has already been adjusted");
+  return (address)(offset + cast_from_oop<intptr_t>(java_mirror()));
 }
 
 
--- a/src/hotspot/share/runtime/arguments.cpp	Mon Jan 08 13:22:05 2018 +0100
+++ b/src/hotspot/share/runtime/arguments.cpp	Mon Jan 08 09:46:31 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -523,6 +523,7 @@
   { "ConvertSleepToYield",           JDK_Version::jdk(9),      JDK_Version::jdk(10), JDK_Version::jdk(11) },
   { "ConvertYieldToSleep",           JDK_Version::jdk(9),      JDK_Version::jdk(10), JDK_Version::jdk(11) },
   { "MinSleepInterval",              JDK_Version::jdk(9),      JDK_Version::jdk(10), JDK_Version::jdk(11) },
+  { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
   { "PermSize",                      JDK_Version::undefined(), JDK_Version::jdk(8),  JDK_Version::undefined() },
   { "MaxPermSize",                   JDK_Version::undefined(), JDK_Version::jdk(8),  JDK_Version::undefined() },
   { "SharedReadWriteSize",           JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
--- a/src/hotspot/share/runtime/globals.hpp	Mon Jan 08 13:22:05 2018 +0100
+++ b/src/hotspot/share/runtime/globals.hpp	Mon Jan 08 09:46:31 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -893,9 +893,6 @@
   develop(bool, TraceJavaAssertions, false,                                 \
           "Trace java language assertions")                                 \
                                                                             \
-  notproduct(bool, CheckAssertionStatusDirectives, false,                   \
-          "Temporary - see javaClasses.cpp")                                \
-                                                                            \
   notproduct(bool, PrintMallocFree, false,                                  \
           "Trace calls to C heap malloc/free allocation")                   \
                                                                             \
--- a/src/hotspot/share/runtime/init.cpp	Mon Jan 08 13:22:05 2018 +0100
+++ b/src/hotspot/share/runtime/init.cpp	Mon Jan 08 09:46:31 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -131,6 +131,7 @@
   InterfaceSupport_init();
   SharedRuntime::generate_stubs();
   universe2_init();  // dependent on codeCache_init and stubRoutines_init1
+  javaClasses_init();// must happen after vtable initialization, before referenceProcessor_init
   referenceProcessor_init();
   jni_handles_init();
 #if INCLUDE_VM_STRUCTS
@@ -150,7 +151,6 @@
   if (!universe_post_init()) {
     return JNI_ERR;
   }
-  javaClasses_init();   // must happen after vtable initialization
   stubRoutines_init2(); // note: StubRoutines need 2-phase init
   MethodHandles::generate_adapters();