jdk8-mips64-public/hotspot: src/share/vm/c1/c1_Runtime1.cpp@190899198332 (annotated)

src/share/vm/c1/c1_Runtime1.cpp@190899198332 (annotated)

src/share/vm/c1/c1_Runtime1.cpp

Thu, 26 Sep 2013 10:25:02 -0400

author: hseigel
date: Thu, 26 Sep 2013 10:25:02 -0400
changeset 5784: 190899198332
parent 5732: b2e698d2276c
child 5805: d0cfa6502dfe
permissions: -rw-r--r--

7195622: CheckUnhandledOops has limited usefulness now
Summary: Enable CHECK_UNHANDLED_OOPS in fastdebug builds across all supported platforms.
Reviewed-by: coleenp, hseigel, dholmes, stefank, twisti, ihse, rdurbin
Contributed-by: lois.foltan@oracle.com

 /*
  * Copyright (c) 1999, 2013, 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
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "asm/codeBuffer.hpp"
 #include "c1/c1_CodeStubs.hpp"
 #include "c1/c1_Defs.hpp"
 #include "c1/c1_FrameMap.hpp"
 #include "c1/c1_LIRAssembler.hpp"
 #include "c1/c1_MacroAssembler.hpp"
 #include "c1/c1_Runtime1.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "code/codeBlob.hpp"
 #include "code/compiledIC.hpp"
 #include "code/pcDesc.hpp"
 #include "code/scopeDesc.hpp"
 #include "code/vtableStubs.hpp"
 #include "compiler/disassembler.hpp"
 #include "gc_interface/collectedHeap.hpp"
 #include "interpreter/bytecode.hpp"
 #include "interpreter/interpreter.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/barrierSet.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/resourceArea.hpp"
 #include "oops/objArrayKlass.hpp"
 #include "oops/oop.inline.hpp"
 #include "runtime/biasedLocking.hpp"
 #include "runtime/compilationPolicy.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/javaCalls.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/threadCritical.hpp"
 #include "runtime/vframe.hpp"
 #include "runtime/vframeArray.hpp"
 #include "utilities/copy.hpp"
 #include "utilities/events.hpp"
 // Implementation of StubAssembler
 StubAssembler::StubAssembler(CodeBuffer* code, const char * name, int stub_id) : C1_MacroAssembler(code) {
   _name = name;
   _must_gc_arguments = false;
   _frame_size = no_frame_size;
   _num_rt_args = 0;
   _stub_id = stub_id;
 }
 void StubAssembler::set_info(const char* name, bool must_gc_arguments) {
   _name = name;
   _must_gc_arguments = must_gc_arguments;
 }
 void StubAssembler::set_frame_size(int size) {
   if (_frame_size == no_frame_size) {
     _frame_size = size;
   }
   assert(_frame_size == size, "can't change the frame size");
 }
 void StubAssembler::set_num_rt_args(int args) {
   if (_num_rt_args == 0) {
     _num_rt_args = args;
   }
   assert(_num_rt_args == args, "can't change the number of args");
 }
 // Implementation of Runtime1
 CodeBlob* Runtime1::_blobs[Runtime1::number_of_ids];
 const char *Runtime1::_blob_names[] = {
   RUNTIME1_STUBS(STUB_NAME, LAST_STUB_NAME)
 };
 #ifndef PRODUCT
 // statistics
 int Runtime1::_generic_arraycopy_cnt = 0;
 int Runtime1::_primitive_arraycopy_cnt = 0;
 int Runtime1::_oop_arraycopy_cnt = 0;
 int Runtime1::_generic_arraycopystub_cnt = 0;
 int Runtime1::_arraycopy_slowcase_cnt = 0;
 int Runtime1::_arraycopy_checkcast_cnt = 0;
 int Runtime1::_arraycopy_checkcast_attempt_cnt = 0;
 int Runtime1::_new_type_array_slowcase_cnt = 0;
 int Runtime1::_new_object_array_slowcase_cnt = 0;
 int Runtime1::_new_instance_slowcase_cnt = 0;
 int Runtime1::_new_multi_array_slowcase_cnt = 0;
 int Runtime1::_monitorenter_slowcase_cnt = 0;
 int Runtime1::_monitorexit_slowcase_cnt = 0;
 int Runtime1::_patch_code_slowcase_cnt = 0;
 int Runtime1::_throw_range_check_exception_count = 0;
 int Runtime1::_throw_index_exception_count = 0;
 int Runtime1::_throw_div0_exception_count = 0;
 int Runtime1::_throw_null_pointer_exception_count = 0;
 int Runtime1::_throw_class_cast_exception_count = 0;
 int Runtime1::_throw_incompatible_class_change_error_count = 0;
 int Runtime1::_throw_array_store_exception_count = 0;
 int Runtime1::_throw_count = 0;
 static int _byte_arraycopy_cnt = 0;
 static int _short_arraycopy_cnt = 0;
 static int _int_arraycopy_cnt = 0;
 static int _long_arraycopy_cnt = 0;
 static int _oop_arraycopy_cnt = 0;
 address Runtime1::arraycopy_count_address(BasicType type) {
   switch (type) {
   case T_BOOLEAN:
   case T_BYTE:   return (address)&_byte_arraycopy_cnt;
   case T_CHAR:
   case T_SHORT:  return (address)&_short_arraycopy_cnt;
   case T_FLOAT:
   case T_INT:    return (address)&_int_arraycopy_cnt;
   case T_DOUBLE:
   case T_LONG:   return (address)&_long_arraycopy_cnt;
   case T_ARRAY:
   case T_OBJECT: return (address)&_oop_arraycopy_cnt;
   default:
     ShouldNotReachHere();
     return NULL;
   }
 }
 #endif
 // Simple helper to see if the caller of a runtime stub which
 // entered the VM has been deoptimized
 static bool caller_is_deopted() {
   JavaThread* thread = JavaThread::current();
   RegisterMap reg_map(thread, false);
   frame runtime_frame = thread->last_frame();
   frame caller_frame = runtime_frame.sender(&reg_map);
   assert(caller_frame.is_compiled_frame(), "must be compiled");
   return caller_frame.is_deoptimized_frame();
 }
 // Stress deoptimization
 static void deopt_caller() {
   if ( !caller_is_deopted()) {
     JavaThread* thread = JavaThread::current();
     RegisterMap reg_map(thread, false);
     frame runtime_frame = thread->last_frame();
     frame caller_frame = runtime_frame.sender(&reg_map);
     Deoptimization::deoptimize_frame(thread, caller_frame.id());
     assert(caller_is_deopted(), "Must be deoptimized");
   }
 }
 void Runtime1::generate_blob_for(BufferBlob* buffer_blob, StubID id) {
   assert(0 <= id && id < number_of_ids, "illegal stub id");
   ResourceMark rm;
   // create code buffer for code storage
   CodeBuffer code(buffer_blob);
   Compilation::setup_code_buffer(&code, 0);
   // create assembler for code generation
   StubAssembler* sasm = new StubAssembler(&code, name_for(id), id);
   // generate code for runtime stub
   OopMapSet* oop_maps;
   oop_maps = generate_code_for(id, sasm);
   assert(oop_maps == NULL || sasm->frame_size() != no_frame_size,
          "if stub has an oop map it must have a valid frame size");
 #ifdef ASSERT
   // Make sure that stubs that need oopmaps have them
   switch (id) {
     // These stubs don't need to have an oopmap
     case dtrace_object_alloc_id:
     case g1_pre_barrier_slow_id:
     case g1_post_barrier_slow_id:
     case slow_subtype_check_id:
     case fpu2long_stub_id:
     case unwind_exception_id:
     case counter_overflow_id:
 #if defined(SPARC) || defined(PPC)
     case handle_exception_nofpu_id:  // Unused on sparc
 #endif
       break;
     // All other stubs should have oopmaps
     default:
       assert(oop_maps != NULL, "must have an oopmap");
   }
 #endif
   // align so printing shows nop's instead of random code at the end (SimpleStubs are aligned)
   sasm->align(BytesPerWord);
   // make sure all code is in code buffer
   sasm->flush();
   // create blob - distinguish a few special cases
   CodeBlob* blob = RuntimeStub::new_runtime_stub(name_for(id),
                                                  &code,
                                                  CodeOffsets::frame_never_safe,
                                                  sasm->frame_size(),
                                                  oop_maps,
                                                  sasm->must_gc_arguments());
   // install blob
   assert(blob != NULL, "blob must exist");
   _blobs[id] = blob;
 }
 void Runtime1::initialize(BufferBlob* blob) {
   // platform-dependent initialization
   initialize_pd();
   // generate stubs
   for (int id = 0; id < number_of_ids; id++) generate_blob_for(blob, (StubID)id);
   // printing
 #ifndef PRODUCT
   if (PrintSimpleStubs) {
     ResourceMark rm;
     for (int id = 0; id < number_of_ids; id++) {
       _blobs[id]->print();
       if (_blobs[id]->oop_maps() != NULL) {
         _blobs[id]->oop_maps()->print();
       }
     }
   }
 #endif
 }
 CodeBlob* Runtime1::blob_for(StubID id) {
   assert(0 <= id && id < number_of_ids, "illegal stub id");
   return _blobs[id];
 }
 const char* Runtime1::name_for(StubID id) {
   assert(0 <= id && id < number_of_ids, "illegal stub id");
   return _blob_names[id];
 }
 const char* Runtime1::name_for_address(address entry) {
   for (int id = 0; id < number_of_ids; id++) {
     if (entry == entry_for((StubID)id)) return name_for((StubID)id);
   }
 #define FUNCTION_CASE(a, f) \
   if ((intptr_t)a == CAST_FROM_FN_PTR(intptr_t, f))  return #f
   FUNCTION_CASE(entry, os::javaTimeMillis);
   FUNCTION_CASE(entry, os::javaTimeNanos);
   FUNCTION_CASE(entry, SharedRuntime::OSR_migration_end);
   FUNCTION_CASE(entry, SharedRuntime::d2f);
   FUNCTION_CASE(entry, SharedRuntime::d2i);
   FUNCTION_CASE(entry, SharedRuntime::d2l);
   FUNCTION_CASE(entry, SharedRuntime::dcos);
   FUNCTION_CASE(entry, SharedRuntime::dexp);
   FUNCTION_CASE(entry, SharedRuntime::dlog);
   FUNCTION_CASE(entry, SharedRuntime::dlog10);
   FUNCTION_CASE(entry, SharedRuntime::dpow);
   FUNCTION_CASE(entry, SharedRuntime::drem);
   FUNCTION_CASE(entry, SharedRuntime::dsin);
   FUNCTION_CASE(entry, SharedRuntime::dtan);
   FUNCTION_CASE(entry, SharedRuntime::f2i);
   FUNCTION_CASE(entry, SharedRuntime::f2l);
   FUNCTION_CASE(entry, SharedRuntime::frem);
   FUNCTION_CASE(entry, SharedRuntime::l2d);
   FUNCTION_CASE(entry, SharedRuntime::l2f);
   FUNCTION_CASE(entry, SharedRuntime::ldiv);
   FUNCTION_CASE(entry, SharedRuntime::lmul);
   FUNCTION_CASE(entry, SharedRuntime::lrem);
   FUNCTION_CASE(entry, SharedRuntime::lrem);
   FUNCTION_CASE(entry, SharedRuntime::dtrace_method_entry);
   FUNCTION_CASE(entry, SharedRuntime::dtrace_method_exit);
   FUNCTION_CASE(entry, is_instance_of);
   FUNCTION_CASE(entry, trace_block_entry);
 #ifdef TRACE_HAVE_INTRINSICS
   FUNCTION_CASE(entry, TRACE_TIME_METHOD);
 #endif
   FUNCTION_CASE(entry, StubRoutines::updateBytesCRC32());
 #undef FUNCTION_CASE
   // Soft float adds more runtime names.
   return pd_name_for_address(entry);
 }
 JRT_ENTRY(void, Runtime1::new_instance(JavaThread* thread, Klass* klass))
   NOT_PRODUCT(_new_instance_slowcase_cnt++;)
   assert(klass->is_klass(), "not a class");
   instanceKlassHandle h(thread, klass);
   h->check_valid_for_instantiation(true, CHECK);
   // make sure klass is initialized
   h->initialize(CHECK);
   // allocate instance and return via TLS
   oop obj = h->allocate_instance(CHECK);
   thread->set_vm_result(obj);
 JRT_END
 JRT_ENTRY(void, Runtime1::new_type_array(JavaThread* thread, Klass* klass, jint length))
   NOT_PRODUCT(_new_type_array_slowcase_cnt++;)
   // Note: no handle for klass needed since they are not used
   //       anymore after new_typeArray() and no GC can happen before.
   //       (This may have to change if this code changes!)
   assert(klass->is_klass(), "not a class");
   BasicType elt_type = TypeArrayKlass::cast(klass)->element_type();
   oop obj = oopFactory::new_typeArray(elt_type, length, CHECK);
   thread->set_vm_result(obj);
   // This is pretty rare but this runtime patch is stressful to deoptimization
   // if we deoptimize here so force a deopt to stress the path.
   if (DeoptimizeALot) {
     deopt_caller();
   }
 JRT_END
 JRT_ENTRY(void, Runtime1::new_object_array(JavaThread* thread, Klass* array_klass, jint length))
   NOT_PRODUCT(_new_object_array_slowcase_cnt++;)
   // Note: no handle for klass needed since they are not used
   //       anymore after new_objArray() and no GC can happen before.
   //       (This may have to change if this code changes!)
   assert(array_klass->is_klass(), "not a class");
   Klass* elem_klass = ObjArrayKlass::cast(array_klass)->element_klass();
   objArrayOop obj = oopFactory::new_objArray(elem_klass, length, CHECK);
   thread->set_vm_result(obj);
   // This is pretty rare but this runtime patch is stressful to deoptimization
   // if we deoptimize here so force a deopt to stress the path.
   if (DeoptimizeALot) {
     deopt_caller();
   }
 JRT_END
 JRT_ENTRY(void, Runtime1::new_multi_array(JavaThread* thread, Klass* klass, int rank, jint* dims))
   NOT_PRODUCT(_new_multi_array_slowcase_cnt++;)
   assert(klass->is_klass(), "not a class");
   assert(rank >= 1, "rank must be nonzero");
   oop obj = ArrayKlass::cast(klass)->multi_allocate(rank, dims, CHECK);
   thread->set_vm_result(obj);
 JRT_END
 JRT_ENTRY(void, Runtime1::unimplemented_entry(JavaThread* thread, StubID id))
   tty->print_cr("Runtime1::entry_for(%d) returned unimplemented entry point", id);
 JRT_END
 JRT_ENTRY(void, Runtime1::throw_array_store_exception(JavaThread* thread, oopDesc* obj))
   ResourceMark rm(thread);
   const char* klass_name = obj->klass()->external_name();
   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayStoreException(), klass_name);
 JRT_END
 // counter_overflow() is called from within C1-compiled methods. The enclosing method is the method
 // associated with the top activation record. The inlinee (that is possibly included in the enclosing
 // method) method oop is passed as an argument. In order to do that it is embedded in the code as
 // a constant.
 static nmethod* counter_overflow_helper(JavaThread* THREAD, int branch_bci, Method* m) {
   nmethod* osr_nm = NULL;
   methodHandle method(THREAD, m);
   RegisterMap map(THREAD, false);
   frame fr =  THREAD->last_frame().sender(&map);
   nmethod* nm = (nmethod*) fr.cb();
   assert(nm!= NULL && nm->is_nmethod(), "Sanity check");
   methodHandle enclosing_method(THREAD, nm->method());
   CompLevel level = (CompLevel)nm->comp_level();
   int bci = InvocationEntryBci;
   if (branch_bci != InvocationEntryBci) {
     // Compute desination bci
     address pc = method()->code_base() + branch_bci;
     Bytecodes::Code branch = Bytecodes::code_at(method(), pc);
     int offset = 0;
     switch (branch) {
       case Bytecodes::_if_icmplt: case Bytecodes::_iflt:
       case Bytecodes::_if_icmpgt: case Bytecodes::_ifgt:
       case Bytecodes::_if_icmple: case Bytecodes::_ifle:
       case Bytecodes::_if_icmpge: case Bytecodes::_ifge:
       case Bytecodes::_if_icmpeq: case Bytecodes::_if_acmpeq: case Bytecodes::_ifeq:
       case Bytecodes::_if_icmpne: case Bytecodes::_if_acmpne: case Bytecodes::_ifne:
       case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: case Bytecodes::_goto:
         offset = (int16_t)Bytes::get_Java_u2(pc + 1);
         break;
       case Bytecodes::_goto_w:
         offset = Bytes::get_Java_u4(pc + 1);
         break;
       default: ;
     }
     bci = branch_bci + offset;
   }
   assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
   osr_nm = CompilationPolicy::policy()->event(enclosing_method, method, branch_bci, bci, level, nm, THREAD);
   assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
   return osr_nm;
 }
 JRT_BLOCK_ENTRY(address, Runtime1::counter_overflow(JavaThread* thread, int bci, Method* method))
   nmethod* osr_nm;
   JRT_BLOCK
     osr_nm = counter_overflow_helper(thread, bci, method);
     if (osr_nm != NULL) {
       RegisterMap map(thread, false);
       frame fr =  thread->last_frame().sender(&map);
       Deoptimization::deoptimize_frame(thread, fr.id());
     }
   JRT_BLOCK_END
   return NULL;
 JRT_END
 extern void vm_exit(int code);
 // Enter this method from compiled code handler below. This is where we transition
 // to VM mode. This is done as a helper routine so that the method called directly
 // from compiled code does not have to transition to VM. This allows the entry
 // method to see if the nmethod that we have just looked up a handler for has
 // been deoptimized while we were in the vm. This simplifies the assembly code
 // cpu directories.
 //
 // We are entering here from exception stub (via the entry method below)
 // If there is a compiled exception handler in this method, we will continue there;
 // otherwise we will unwind the stack and continue at the caller of top frame method
 // Note: we enter in Java using a special JRT wrapper. This wrapper allows us to
 // control the area where we can allow a safepoint. After we exit the safepoint area we can
 // check to see if the handler we are going to return is now in a nmethod that has
 // been deoptimized. If that is the case we return the deopt blob
 // unpack_with_exception entry instead. This makes life for the exception blob easier
 // because making that same check and diverting is painful from assembly language.
 JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* thread, oopDesc* ex, address pc, nmethod*& nm))
   // Reset method handle flag.
   thread->set_is_method_handle_return(false);
   Handle exception(thread, ex);
   nm = CodeCache::find_nmethod(pc);
   assert(nm != NULL, "this is not an nmethod");
   // Adjust the pc as needed/
   if (nm->is_deopt_pc(pc)) {
     RegisterMap map(thread, false);
     frame exception_frame = thread->last_frame().sender(&map);
     // if the frame isn't deopted then pc must not correspond to the caller of last_frame
     assert(exception_frame.is_deoptimized_frame(), "must be deopted");
     pc = exception_frame.pc();
   }
 #ifdef ASSERT
   assert(exception.not_null(), "NULL exceptions should be handled by throw_exception");
   assert(exception->is_oop(), "just checking");
   // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
   if (!(exception->is_a(SystemDictionary::Throwable_klass()))) {
     if (ExitVMOnVerifyError) vm_exit(-1);
     ShouldNotReachHere();
   }
 #endif
   // Check the stack guard pages and reenable them if necessary and there is
   // enough space on the stack to do so.  Use fast exceptions only if the guard
   // pages are enabled.
   bool guard_pages_enabled = thread->stack_yellow_zone_enabled();
   if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
   if (JvmtiExport::can_post_on_exceptions()) {
     // To ensure correct notification of exception catches and throws
     // we have to deoptimize here.  If we attempted to notify the
     // catches and throws during this exception lookup it's possible
     // we could deoptimize on the way out of the VM and end back in
     // the interpreter at the throw site.  This would result in double
     // notifications since the interpreter would also notify about
     // these same catches and throws as it unwound the frame.
     RegisterMap reg_map(thread);
     frame stub_frame = thread->last_frame();
     frame caller_frame = stub_frame.sender(&reg_map);
     // We don't really want to deoptimize the nmethod itself since we
     // can actually continue in the exception handler ourselves but I
     // don't see an easy way to have the desired effect.
     Deoptimization::deoptimize_frame(thread, caller_frame.id());
     assert(caller_is_deopted(), "Must be deoptimized");
     return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
   }
   // ExceptionCache is used only for exceptions at call sites and not for implicit exceptions
   if (guard_pages_enabled) {
     address fast_continuation = nm->handler_for_exception_and_pc(exception, pc);
     if (fast_continuation != NULL) {
       // Set flag if return address is a method handle call site.
       thread->set_is_method_handle_return(nm->is_method_handle_return(pc));
       return fast_continuation;
     }
   }
   // If the stack guard pages are enabled, check whether there is a handler in
   // the current method.  Otherwise (guard pages disabled), force an unwind and
   // skip the exception cache update (i.e., just leave continuation==NULL).
   address continuation = NULL;
   if (guard_pages_enabled) {
     // New exception handling mechanism can support inlined methods
     // with exception handlers since the mappings are from PC to PC
     // debugging support
     // tracing
     if (TraceExceptions) {
       ttyLocker ttyl;
       ResourceMark rm;
       tty->print_cr("Exception <%s> (0x%x) thrown in compiled method <%s> at PC " PTR_FORMAT " for thread 0x%x",
                     exception->print_value_string(), (address)exception(), nm->method()->print_value_string(), pc, thread);
     }
     // for AbortVMOnException flag
     NOT_PRODUCT(Exceptions::debug_check_abort(exception));
     // Clear out the exception oop and pc since looking up an
     // exception handler can cause class loading, which might throw an
     // exception and those fields are expected to be clear during
     // normal bytecode execution.
     thread->set_exception_oop(NULL);
     thread->set_exception_pc(NULL);
     continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false);
     // If an exception was thrown during exception dispatch, the exception oop may have changed
     thread->set_exception_oop(exception());
     thread->set_exception_pc(pc);
     // the exception cache is used only by non-implicit exceptions
     if (continuation != NULL) {
       nm->add_handler_for_exception_and_pc(exception, pc, continuation);
     }
   }
   thread->set_vm_result(exception());
   // Set flag if return address is a method handle call site.
   thread->set_is_method_handle_return(nm->is_method_handle_return(pc));
   if (TraceExceptions) {
     ttyLocker ttyl;
     ResourceMark rm;
     tty->print_cr("Thread " PTR_FORMAT " continuing at PC " PTR_FORMAT " for exception thrown at PC " PTR_FORMAT,
                   thread, continuation, pc);
   }
   return continuation;
 JRT_END
 // Enter this method from compiled code only if there is a Java exception handler
 // in the method handling the exception.
 // We are entering here from exception stub. We don't do a normal VM transition here.
 // We do it in a helper. This is so we can check to see if the nmethod we have just
 // searched for an exception handler has been deoptimized in the meantime.
 address Runtime1::exception_handler_for_pc(JavaThread* thread) {
   oop exception = thread->exception_oop();
   address pc = thread->exception_pc();
   // Still in Java mode
   DEBUG_ONLY(ResetNoHandleMark rnhm);
   nmethod* nm = NULL;
   address continuation = NULL;
   {
     // Enter VM mode by calling the helper
     ResetNoHandleMark rnhm;
     continuation = exception_handler_for_pc_helper(thread, exception, pc, nm);
   }
   // Back in JAVA, use no oops DON'T safepoint
   // Now check to see if the nmethod we were called from is now deoptimized.
   // If so we must return to the deopt blob and deoptimize the nmethod
   if (nm != NULL && caller_is_deopted()) {
     continuation = SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
   }
   assert(continuation != NULL, "no handler found");
   return continuation;
 }
 JRT_ENTRY(void, Runtime1::throw_range_check_exception(JavaThread* thread, int index))
   NOT_PRODUCT(_throw_range_check_exception_count++;)
   char message[jintAsStringSize];
   sprintf(message, "%d", index);
   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), message);
 JRT_END
 JRT_ENTRY(void, Runtime1::throw_index_exception(JavaThread* thread, int index))
   NOT_PRODUCT(_throw_index_exception_count++;)
   char message[16];
   sprintf(message, "%d", index);
   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IndexOutOfBoundsException(), message);
 JRT_END
 JRT_ENTRY(void, Runtime1::throw_div0_exception(JavaThread* thread))
   NOT_PRODUCT(_throw_div0_exception_count++;)
   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
 JRT_END
 JRT_ENTRY(void, Runtime1::throw_null_pointer_exception(JavaThread* thread))
   NOT_PRODUCT(_throw_null_pointer_exception_count++;)
   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
 JRT_END
 JRT_ENTRY(void, Runtime1::throw_class_cast_exception(JavaThread* thread, oopDesc* object))
   NOT_PRODUCT(_throw_class_cast_exception_count++;)
   ResourceMark rm(thread);
   char* message = SharedRuntime::generate_class_cast_message(
     thread, object->klass()->external_name());
   SharedRuntime::throw_and_post_jvmti_exception(
     thread, vmSymbols::java_lang_ClassCastException(), message);
 JRT_END
 JRT_ENTRY(void, Runtime1::throw_incompatible_class_change_error(JavaThread* thread))
   NOT_PRODUCT(_throw_incompatible_class_change_error_count++;)
   ResourceMark rm(thread);
   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError());
 JRT_END
 JRT_ENTRY_NO_ASYNC(void, Runtime1::monitorenter(JavaThread* thread, oopDesc* obj, BasicObjectLock* lock))
   NOT_PRODUCT(_monitorenter_slowcase_cnt++;)
   if (PrintBiasedLockingStatistics) {
     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
   }
   Handle h_obj(thread, obj);
   assert(h_obj()->is_oop(), "must be NULL or an object");
   if (UseBiasedLocking) {
     // Retry fast entry if bias is revoked to avoid unnecessary inflation
     ObjectSynchronizer::fast_enter(h_obj, lock->lock(), true, CHECK);
   } else {
     if (UseFastLocking) {
       // When using fast locking, the compiled code has already tried the fast case
       assert(obj == lock->obj(), "must match");
       ObjectSynchronizer::slow_enter(h_obj, lock->lock(), THREAD);
     } else {
       lock->set_obj(obj);
       ObjectSynchronizer::fast_enter(h_obj, lock->lock(), false, THREAD);
     }
   }
 JRT_END
 JRT_LEAF(void, Runtime1::monitorexit(JavaThread* thread, BasicObjectLock* lock))
   NOT_PRODUCT(_monitorexit_slowcase_cnt++;)
   assert(thread == JavaThread::current(), "threads must correspond");
   assert(thread->last_Java_sp(), "last_Java_sp must be set");
   // monitorexit is non-blocking (leaf routine) => no exceptions can be thrown
   EXCEPTION_MARK;
   oop obj = lock->obj();
   assert(obj->is_oop(), "must be NULL or an object");
   if (UseFastLocking) {
     // When using fast locking, the compiled code has already tried the fast case
     ObjectSynchronizer::slow_exit(obj, lock->lock(), THREAD);
   } else {
     ObjectSynchronizer::fast_exit(obj, lock->lock(), THREAD);
   }
 JRT_END
 // Cf. OptoRuntime::deoptimize_caller_frame
 JRT_ENTRY(void, Runtime1::deoptimize(JavaThread* thread))
   // Called from within the owner thread, so no need for safepoint
   RegisterMap reg_map(thread, false);
   frame stub_frame = thread->last_frame();
   assert(stub_frame.is_runtime_frame(), "sanity check");
   frame caller_frame = stub_frame.sender(&reg_map);
   // We are coming from a compiled method; check this is true.
   assert(CodeCache::find_nmethod(caller_frame.pc()) != NULL, "sanity");
   // Deoptimize the caller frame.
   Deoptimization::deoptimize_frame(thread, caller_frame.id());
   // Return to the now deoptimized frame.
 JRT_END
 static Klass* resolve_field_return_klass(methodHandle caller, int bci, TRAPS) {
   Bytecode_field field_access(caller, bci);
   // This can be static or non-static field access
   Bytecodes::Code code       = field_access.code();
   // We must load class, initialize class and resolvethe field
   fieldDescriptor result; // initialize class if needed
   constantPoolHandle constants(THREAD, caller->constants());
   LinkResolver::resolve_field_access(result, constants, field_access.index(), Bytecodes::java_code(code), CHECK_NULL);
   return result.field_holder();
 }
 //
 // This routine patches sites where a class wasn't loaded or
 // initialized at the time the code was generated.  It handles
 // references to classes, fields and forcing of initialization.  Most
 // of the cases are straightforward and involving simply forcing
 // resolution of a class, rewriting the instruction stream with the
 // needed constant and replacing the call in this function with the
 // patched code.  The case for static field is more complicated since
 // the thread which is in the process of initializing a class can
 // access it's static fields but other threads can't so the code
 // either has to deoptimize when this case is detected or execute a
 // check that the current thread is the initializing thread.  The
 // current
 //
 // Patches basically look like this:
 //
 //
 // patch_site: jmp patch stub     ;; will be patched
 // continue:   ...
 //             ...
 //             ...
 //             ...
 //
 // They have a stub which looks like this:
 //
 //             ;; patch body
 //             movl <const>, reg           (for class constants)
 //        <or> movl [reg1 + <const>], reg  (for field offsets)
 //        <or> movl reg, [reg1 + <const>]  (for field offsets)
 //             <being_init offset> <bytes to copy> <bytes to skip>
 // patch_stub: call Runtime1::patch_code (through a runtime stub)
 //             jmp patch_site
 //
 //
 // A normal patch is done by rewriting the patch body, usually a move,
 // and then copying it into place over top of the jmp instruction
 // being careful to flush caches and doing it in an MP-safe way.  The
 // constants following the patch body are used to find various pieces
 // of the patch relative to the call site for Runtime1::patch_code.
 // The case for getstatic and putstatic is more complicated because
 // getstatic and putstatic have special semantics when executing while
 // the class is being initialized.  getstatic/putstatic on a class
 // which is being_initialized may be executed by the initializing
 // thread but other threads have to block when they execute it.  This
 // is accomplished in compiled code by executing a test of the current
 // thread against the initializing thread of the class.  It's emitted
 // as boilerplate in their stub which allows the patched code to be
 // executed before it's copied back into the main body of the nmethod.
 //
 // being_init: get_thread(<tmp reg>
 //             cmpl [reg1 + <init_thread_offset>], <tmp reg>
 //             jne patch_stub
 //             movl [reg1 + <const>], reg  (for field offsets)  <or>
 //             movl reg, [reg1 + <const>]  (for field offsets)
 //             jmp continue
 //             <being_init offset> <bytes to copy> <bytes to skip>
 // patch_stub: jmp Runtim1::patch_code (through a runtime stub)
 //             jmp patch_site
 //
 // If the class is being initialized the patch body is rewritten and
 // the patch site is rewritten to jump to being_init, instead of
 // patch_stub.  Whenever this code is executed it checks the current
 // thread against the intializing thread so other threads will enter
 // the runtime and end up blocked waiting the class to finish
 // initializing inside the calls to resolve_field below.  The
 // initializing class will continue on it's way.  Once the class is
 // fully_initialized, the intializing_thread of the class becomes
 // NULL, so the next thread to execute this code will fail the test,
 // call into patch_code and complete the patching process by copying
 // the patch body back into the main part of the nmethod and resume
 // executing.
 //
 //
 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id ))
   NOT_PRODUCT(_patch_code_slowcase_cnt++;)
   ResourceMark rm(thread);
   RegisterMap reg_map(thread, false);
   frame runtime_frame = thread->last_frame();
   frame caller_frame = runtime_frame.sender(&reg_map);
   // last java frame on stack
   vframeStream vfst(thread, true);
   assert(!vfst.at_end(), "Java frame must exist");
   methodHandle caller_method(THREAD, vfst.method());
   // Note that caller_method->code() may not be same as caller_code because of OSR's
   // Note also that in the presence of inlining it is not guaranteed
   // that caller_method() == caller_code->method()
   int bci = vfst.bci();
   Bytecodes::Code code = caller_method()->java_code_at(bci);
 #ifndef PRODUCT
   // this is used by assertions in the access_field_patching_id
   BasicType patch_field_type = T_ILLEGAL;
 #endif // PRODUCT
   bool deoptimize_for_volatile = false;
   int patch_field_offset = -1;
   KlassHandle init_klass(THREAD, NULL); // klass needed by load_klass_patching code
   KlassHandle load_klass(THREAD, NULL); // klass needed by load_klass_patching code
   Handle mirror(THREAD, NULL);                    // oop needed by load_mirror_patching code
   Handle appendix(THREAD, NULL);                  // oop needed by appendix_patching code
   bool load_klass_or_mirror_patch_id =
     (stub_id == Runtime1::load_klass_patching_id || stub_id == Runtime1::load_mirror_patching_id);
   if (stub_id == Runtime1::access_field_patching_id) {
     Bytecode_field field_access(caller_method, bci);
     fieldDescriptor result; // initialize class if needed
     Bytecodes::Code code = field_access.code();
     constantPoolHandle constants(THREAD, caller_method->constants());
     LinkResolver::resolve_field_access(result, constants, field_access.index(), Bytecodes::java_code(code), CHECK);
     patch_field_offset = result.offset();
     // If we're patching a field which is volatile then at compile it
     // must not have been know to be volatile, so the generated code
     // isn't correct for a volatile reference.  The nmethod has to be
     // deoptimized so that the code can be regenerated correctly.
     // This check is only needed for access_field_patching since this
     // is the path for patching field offsets.  load_klass is only
     // used for patching references to oops which don't need special
     // handling in the volatile case.
     deoptimize_for_volatile = result.access_flags().is_volatile();
 #ifndef PRODUCT
     patch_field_type = result.field_type();
 #endif
   } else if (load_klass_or_mirror_patch_id) {
     Klass* k = NULL;
     switch (code) {
       case Bytecodes::_putstatic:
       case Bytecodes::_getstatic:
         { Klass* klass = resolve_field_return_klass(caller_method, bci, CHECK);
           init_klass = KlassHandle(THREAD, klass);
           mirror = Handle(THREAD, klass->java_mirror());
         }
         break;
       case Bytecodes::_new:
         { Bytecode_new bnew(caller_method(), caller_method->bcp_from(bci));
           k = caller_method->constants()->klass_at(bnew.index(), CHECK);
         }
         break;
       case Bytecodes::_multianewarray:
         { Bytecode_multianewarray mna(caller_method(), caller_method->bcp_from(bci));
           k = caller_method->constants()->klass_at(mna.index(), CHECK);
         }
         break;
       case Bytecodes::_instanceof:
         { Bytecode_instanceof io(caller_method(), caller_method->bcp_from(bci));
           k = caller_method->constants()->klass_at(io.index(), CHECK);
         }
         break;
       case Bytecodes::_checkcast:
         { Bytecode_checkcast cc(caller_method(), caller_method->bcp_from(bci));
           k = caller_method->constants()->klass_at(cc.index(), CHECK);
         }
         break;
       case Bytecodes::_anewarray:
         { Bytecode_anewarray anew(caller_method(), caller_method->bcp_from(bci));
           Klass* ek = caller_method->constants()->klass_at(anew.index(), CHECK);
           k = ek->array_klass(CHECK);
         }
         break;
       case Bytecodes::_ldc:
       case Bytecodes::_ldc_w:
         {
           Bytecode_loadconstant cc(caller_method, bci);
           oop m = cc.resolve_constant(CHECK);
           mirror = Handle(THREAD, m);
         }
         break;
       default: fatal("unexpected bytecode for load_klass_or_mirror_patch_id");
     }
     // convert to handle
     load_klass = KlassHandle(THREAD, k);
   } else if (stub_id == load_appendix_patching_id) {
     Bytecode_invoke bytecode(caller_method, bci);
     Bytecodes::Code bc = bytecode.invoke_code();
     CallInfo info;
     constantPoolHandle pool(thread, caller_method->constants());
     int index = bytecode.index();
     LinkResolver::resolve_invoke(info, Handle(), pool, index, bc, CHECK);
     appendix = info.resolved_appendix();
     switch (bc) {
       case Bytecodes::_invokehandle: {
         int cache_index = ConstantPool::decode_cpcache_index(index, true);
         assert(cache_index >= 0 && cache_index < pool->cache()->length(), "unexpected cache index");
         pool->cache()->entry_at(cache_index)->set_method_handle(pool, info);
         break;
       }
       case Bytecodes::_invokedynamic: {
         pool->invokedynamic_cp_cache_entry_at(index)->set_dynamic_call(pool, info);
         break;
       }
       default: fatal("unexpected bytecode for load_appendix_patching_id");
     }
   } else {
     ShouldNotReachHere();
   }
   if (deoptimize_for_volatile) {
     // At compile time we assumed the field wasn't volatile but after
     // loading it turns out it was volatile so we have to throw the
     // compiled code out and let it be regenerated.
     if (TracePatching) {
       tty->print_cr("Deoptimizing for patching volatile field reference");
     }
     // It's possible the nmethod was invalidated in the last
     // safepoint, but if it's still alive then make it not_entrant.
     nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
     if (nm != NULL) {
       nm->make_not_entrant();
     }
     Deoptimization::deoptimize_frame(thread, caller_frame.id());
     // Return to the now deoptimized frame.
   }
   // Now copy code back
   {
     MutexLockerEx ml_patch (Patching_lock, Mutex::_no_safepoint_check_flag);
     //
     // Deoptimization may have happened while we waited for the lock.
     // In that case we don't bother to do any patching we just return
     // and let the deopt happen
     if (!caller_is_deopted()) {
       NativeGeneralJump* jump = nativeGeneralJump_at(caller_frame.pc());
       address instr_pc = jump->jump_destination();
       NativeInstruction* ni = nativeInstruction_at(instr_pc);
       if (ni->is_jump() ) {
         // the jump has not been patched yet
         // The jump destination is slow case and therefore not part of the stubs
         // (stubs are only for StaticCalls)
         // format of buffer
         //    ....
         //    instr byte 0     <-- copy_buff
         //    instr byte 1
         //    ..
         //    instr byte n-1
         //      n
         //    ....             <-- call destination
         address stub_location = caller_frame.pc() + PatchingStub::patch_info_offset();
         unsigned char* byte_count = (unsigned char*) (stub_location - 1);
         unsigned char* byte_skip = (unsigned char*) (stub_location - 2);
         unsigned char* being_initialized_entry_offset = (unsigned char*) (stub_location - 3);
         address copy_buff = stub_location - *byte_skip - *byte_count;
         address being_initialized_entry = stub_location - *being_initialized_entry_offset;
         if (TracePatching) {
           tty->print_cr(" Patching %s at bci %d at address 0x%x  (%s)", Bytecodes::name(code), bci,
                         instr_pc, (stub_id == Runtime1::access_field_patching_id) ? "field" : "klass");
           nmethod* caller_code = CodeCache::find_nmethod(caller_frame.pc());
           assert(caller_code != NULL, "nmethod not found");
           // NOTE we use pc() not original_pc() because we already know they are
           // identical otherwise we'd have never entered this block of code
           OopMap* map = caller_code->oop_map_for_return_address(caller_frame.pc());
           assert(map != NULL, "null check");
           map->print();
           tty->cr();
           Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
         }
         // depending on the code below, do_patch says whether to copy the patch body back into the nmethod
         bool do_patch = true;
         if (stub_id == Runtime1::access_field_patching_id) {
           // The offset may not be correct if the class was not loaded at code generation time.
           // Set it now.
           NativeMovRegMem* n_move = nativeMovRegMem_at(copy_buff);
           assert(n_move->offset() == 0 || (n_move->offset() == 4 && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG)), "illegal offset for type");
           assert(patch_field_offset >= 0, "illegal offset");
           n_move->add_offset_in_bytes(patch_field_offset);
         } else if (load_klass_or_mirror_patch_id) {
           // If a getstatic or putstatic is referencing a klass which
           // isn't fully initialized, the patch body isn't copied into
           // place until initialization is complete.  In this case the
           // patch site is setup so that any threads besides the
           // initializing thread are forced to come into the VM and
           // block.
           do_patch = (code != Bytecodes::_getstatic && code != Bytecodes::_putstatic) ||
                      InstanceKlass::cast(init_klass())->is_initialized();
           NativeGeneralJump* jump = nativeGeneralJump_at(instr_pc);
           if (jump->jump_destination() == being_initialized_entry) {
             assert(do_patch == true, "initialization must be complete at this point");
           } else {
             // patch the instruction <move reg, klass>
             NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff);
             assert(n_copy->data() == 0 ||
                    n_copy->data() == (intptr_t)Universe::non_oop_word(),
                    "illegal init value");
             if (stub_id == Runtime1::load_klass_patching_id) {
               assert(load_klass() != NULL, "klass not set");
               n_copy->set_data((intx) (load_klass()));
             } else {
               assert(mirror() != NULL, "klass not set");
               n_copy->set_data(cast_from_oop<intx>(mirror()));
             }
             if (TracePatching) {
               Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
             }
           }
         } else if (stub_id == Runtime1::load_appendix_patching_id) {
           NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff);
           assert(n_copy->data() == 0 ||
                  n_copy->data() == (intptr_t)Universe::non_oop_word(),
                  "illegal init value");
           n_copy->set_data(cast_from_oop<intx>(appendix()));
           if (TracePatching) {
             Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
           }
         } else {
           ShouldNotReachHere();
         }
 #if defined(SPARC) || defined(PPC)
         if (load_klass_or_mirror_patch_id ||
             stub_id == Runtime1::load_appendix_patching_id) {
           // Update the location in the nmethod with the proper
           // metadata.  When the code was generated, a NULL was stuffed
           // in the metadata table and that table needs to be update to
           // have the right value.  On intel the value is kept
           // directly in the instruction instead of in the metadata
           // table, so set_data above effectively updated the value.
           nmethod* nm = CodeCache::find_nmethod(instr_pc);
           assert(nm != NULL, "invalid nmethod_pc");
           RelocIterator mds(nm, copy_buff, copy_buff + 1);
           bool found = false;
           while (mds.next() && !found) {
             if (mds.type() == relocInfo::oop_type) {
               assert(stub_id == Runtime1::load_mirror_patching_id ||
                      stub_id == Runtime1::load_appendix_patching_id, "wrong stub id");
               oop_Relocation* r = mds.oop_reloc();
               oop* oop_adr = r->oop_addr();
               *oop_adr = stub_id == Runtime1::load_mirror_patching_id ? mirror() : appendix();
               r->fix_oop_relocation();
               found = true;
             } else if (mds.type() == relocInfo::metadata_type) {
               assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id");
               metadata_Relocation* r = mds.metadata_reloc();
               Metadata** metadata_adr = r->metadata_addr();
               *metadata_adr = load_klass();
               r->fix_metadata_relocation();
               found = true;
             }
           }
           assert(found, "the metadata must exist!");
         }
 #endif
         if (do_patch) {
           // replace instructions
           // first replace the tail, then the call
 #ifdef ARM
           if(load_klass_or_mirror_patch_id && !VM_Version::supports_movw()) {
             nmethod* nm = CodeCache::find_nmethod(instr_pc);
             address addr = NULL;
             assert(nm != NULL, "invalid nmethod_pc");
             RelocIterator mds(nm, copy_buff, copy_buff + 1);
             while (mds.next()) {
               if (mds.type() == relocInfo::oop_type) {
                 assert(stub_id == Runtime1::load_mirror_patching_id, "wrong stub id");
                 oop_Relocation* r = mds.oop_reloc();
                 addr = (address)r->oop_addr();
                 break;
               } else if (mds.type() == relocInfo::metadata_type) {
                 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id");
                 metadata_Relocation* r = mds.metadata_reloc();
                 addr = (address)r->metadata_addr();
                 break;
               }
             }
             assert(addr != NULL, "metadata relocation must exist");
             copy_buff -= *byte_count;
             NativeMovConstReg* n_copy2 = nativeMovConstReg_at(copy_buff);
             n_copy2->set_pc_relative_offset(addr, instr_pc);
           }
 #endif
           for (int i = NativeCall::instruction_size; i < *byte_count; i++) {
             address ptr = copy_buff + i;
             int a_byte = (*ptr) & 0xFF;
             address dst = instr_pc + i;
             *(unsigned char*)dst = (unsigned char) a_byte;
           }
           ICache::invalidate_range(instr_pc, *byte_count);
           NativeGeneralJump::replace_mt_safe(instr_pc, copy_buff);
           if (load_klass_or_mirror_patch_id ||
               stub_id == Runtime1::load_appendix_patching_id) {
             relocInfo::relocType rtype =
               (stub_id == Runtime1::load_klass_patching_id) ?
                                    relocInfo::metadata_type :
                                    relocInfo::oop_type;
             // update relocInfo to metadata
             nmethod* nm = CodeCache::find_nmethod(instr_pc);
             assert(nm != NULL, "invalid nmethod_pc");
             // The old patch site is now a move instruction so update
             // the reloc info so that it will get updated during
             // future GCs.
             RelocIterator iter(nm, (address)instr_pc, (address)(instr_pc + 1));
             relocInfo::change_reloc_info_for_address(&iter, (address) instr_pc,
                                                      relocInfo::none, rtype);
 #ifdef SPARC
             // Sparc takes two relocations for an metadata so update the second one.
             address instr_pc2 = instr_pc + NativeMovConstReg::add_offset;
             RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1);
             relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2,
                                                      relocInfo::none, rtype);
 #endif
 #ifdef PPC
           { address instr_pc2 = instr_pc + NativeMovConstReg::lo_offset;
             RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1);
             relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2,
                                                      relocInfo::none, rtype);
           }
 #endif
           }
         } else {
           ICache::invalidate_range(copy_buff, *byte_count);
           NativeGeneralJump::insert_unconditional(instr_pc, being_initialized_entry);
         }
       }
     }
   }
   // If we are patching in a non-perm oop, make sure the nmethod
   // is on the right list.
   if (ScavengeRootsInCode && ((mirror.not_null() && mirror()->is_scavengable()) ||
                               (appendix.not_null() && appendix->is_scavengable()))) {
     MutexLockerEx ml_code (CodeCache_lock, Mutex::_no_safepoint_check_flag);
     nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
     guarantee(nm != NULL, "only nmethods can contain non-perm oops");
     if (!nm->on_scavenge_root_list()) {
       CodeCache::add_scavenge_root_nmethod(nm);
     }
     // Since we've patched some oops in the nmethod,
     // (re)register it with the heap.
     Universe::heap()->register_nmethod(nm);
   }
 JRT_END
 //
 // Entry point for compiled code. We want to patch a nmethod.
 // We don't do a normal VM transition here because we want to
 // know after the patching is complete and any safepoint(s) are taken
 // if the calling nmethod was deoptimized. We do this by calling a
 // helper method which does the normal VM transition and when it
 // completes we can check for deoptimization. This simplifies the
 // assembly code in the cpu directories.
 //
 int Runtime1::move_klass_patching(JavaThread* thread) {
 //
 // NOTE: we are still in Java
 //
   Thread* THREAD = thread;
   debug_only(NoHandleMark nhm;)
   {
     // Enter VM mode
     ResetNoHandleMark rnhm;
     patch_code(thread, load_klass_patching_id);
   }
   // Back in JAVA, use no oops DON'T safepoint
   // Return true if calling code is deoptimized
   return caller_is_deopted();
 }
 int Runtime1::move_mirror_patching(JavaThread* thread) {
 //
 // NOTE: we are still in Java
 //
   Thread* THREAD = thread;
   debug_only(NoHandleMark nhm;)
   {
     // Enter VM mode
     ResetNoHandleMark rnhm;
     patch_code(thread, load_mirror_patching_id);
   }
   // Back in JAVA, use no oops DON'T safepoint
   // Return true if calling code is deoptimized
   return caller_is_deopted();
 }
 int Runtime1::move_appendix_patching(JavaThread* thread) {
 //
 // NOTE: we are still in Java
 //
   Thread* THREAD = thread;
   debug_only(NoHandleMark nhm;)
   {
     // Enter VM mode
     ResetNoHandleMark rnhm;
     patch_code(thread, load_appendix_patching_id);
   }
   // Back in JAVA, use no oops DON'T safepoint
   // Return true if calling code is deoptimized
   return caller_is_deopted();
 }
 //
 // Entry point for compiled code. We want to patch a nmethod.
 // We don't do a normal VM transition here because we want to
 // know after the patching is complete and any safepoint(s) are taken
 // if the calling nmethod was deoptimized. We do this by calling a
 // helper method which does the normal VM transition and when it
 // completes we can check for deoptimization. This simplifies the
 // assembly code in the cpu directories.
 //
 int Runtime1::access_field_patching(JavaThread* thread) {
 //
 // NOTE: we are still in Java
 //
   Thread* THREAD = thread;
   debug_only(NoHandleMark nhm;)
   {
     // Enter VM mode
     ResetNoHandleMark rnhm;
     patch_code(thread, access_field_patching_id);
   }
   // Back in JAVA, use no oops DON'T safepoint
   // Return true if calling code is deoptimized
   return caller_is_deopted();
 JRT_END
 JRT_LEAF(void, Runtime1::trace_block_entry(jint block_id))
   // for now we just print out the block id
   tty->print("%d ", block_id);
 JRT_END
 // Array copy return codes.
 enum {
   ac_failed = -1, // arraycopy failed
   ac_ok = 0       // arraycopy succeeded
 };
 // Below length is the # elements copied.
 template <class T> int obj_arraycopy_work(oopDesc* src, T* src_addr,
                                           oopDesc* dst, T* dst_addr,
                                           int length) {
   // For performance reasons, we assume we are using a card marking write
   // barrier. The assert will fail if this is not the case.
   // Note that we use the non-virtual inlineable variant of write_ref_array.
   BarrierSet* bs = Universe::heap()->barrier_set();
   assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");
   assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well.");
   if (src == dst) {
     // same object, no check
     bs->write_ref_array_pre(dst_addr, length);
     Copy::conjoint_oops_atomic(src_addr, dst_addr, length);
     bs->write_ref_array((HeapWord*)dst_addr, length);
     return ac_ok;
   } else {
     Klass* bound = ObjArrayKlass::cast(dst->klass())->element_klass();
     Klass* stype = ObjArrayKlass::cast(src->klass())->element_klass();
     if (stype == bound || stype->is_subtype_of(bound)) {
       // Elements are guaranteed to be subtypes, so no check necessary
       bs->write_ref_array_pre(dst_addr, length);
       Copy::conjoint_oops_atomic(src_addr, dst_addr, length);
       bs->write_ref_array((HeapWord*)dst_addr, length);
       return ac_ok;
     }
   }
   return ac_failed;
 }
 // fast and direct copy of arrays; returning -1, means that an exception may be thrown
 // and we did not copy anything
 JRT_LEAF(int, Runtime1::arraycopy(oopDesc* src, int src_pos, oopDesc* dst, int dst_pos, int length))
 #ifndef PRODUCT
   _generic_arraycopy_cnt++;        // Slow-path oop array copy
 #endif
   if (src == NULL || dst == NULL || src_pos < 0 || dst_pos < 0 || length < 0) return ac_failed;
   if (!dst->is_array() || !src->is_array()) return ac_failed;
   if ((unsigned int) arrayOop(src)->length() < (unsigned int)src_pos + (unsigned int)length) return ac_failed;
   if ((unsigned int) arrayOop(dst)->length() < (unsigned int)dst_pos + (unsigned int)length) return ac_failed;
   if (length == 0) return ac_ok;
   if (src->is_typeArray()) {
     Klass* klass_oop = src->klass();
     if (klass_oop != dst->klass()) return ac_failed;
     TypeArrayKlass* klass = TypeArrayKlass::cast(klass_oop);
     const int l2es = klass->log2_element_size();
     const int ihs = klass->array_header_in_bytes() / wordSize;
     char* src_addr = (char*) ((oopDesc**)src + ihs) + (src_pos << l2es);
     char* dst_addr = (char*) ((oopDesc**)dst + ihs) + (dst_pos << l2es);
     // Potential problem: memmove is not guaranteed to be word atomic
     // Revisit in Merlin
     memmove(dst_addr, src_addr, length << l2es);
     return ac_ok;
   } else if (src->is_objArray() && dst->is_objArray()) {
     if (UseCompressedOops) {
       narrowOop *src_addr  = objArrayOop(src)->obj_at_addr<narrowOop>(src_pos);
       narrowOop *dst_addr  = objArrayOop(dst)->obj_at_addr<narrowOop>(dst_pos);
       return obj_arraycopy_work(src, src_addr, dst, dst_addr, length);
     } else {
       oop *src_addr  = objArrayOop(src)->obj_at_addr<oop>(src_pos);
       oop *dst_addr  = objArrayOop(dst)->obj_at_addr<oop>(dst_pos);
       return obj_arraycopy_work(src, src_addr, dst, dst_addr, length);
     }
   }
   return ac_failed;
 JRT_END
 JRT_LEAF(void, Runtime1::primitive_arraycopy(HeapWord* src, HeapWord* dst, int length))
 #ifndef PRODUCT
   _primitive_arraycopy_cnt++;
 #endif
   if (length == 0) return;
   // Not guaranteed to be word atomic, but that doesn't matter
   // for anything but an oop array, which is covered by oop_arraycopy.
   Copy::conjoint_jbytes(src, dst, length);
 JRT_END
 JRT_LEAF(void, Runtime1::oop_arraycopy(HeapWord* src, HeapWord* dst, int num))
 #ifndef PRODUCT
   _oop_arraycopy_cnt++;
 #endif
   if (num == 0) return;
   BarrierSet* bs = Universe::heap()->barrier_set();
   assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");
   assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well.");
   if (UseCompressedOops) {
     bs->write_ref_array_pre((narrowOop*)dst, num);
     Copy::conjoint_oops_atomic((narrowOop*) src, (narrowOop*) dst, num);
   } else {
     bs->write_ref_array_pre((oop*)dst, num);
     Copy::conjoint_oops_atomic((oop*) src, (oop*) dst, num);
   }
   bs->write_ref_array(dst, num);
 JRT_END
 JRT_LEAF(int, Runtime1::is_instance_of(oopDesc* mirror, oopDesc* obj))
   // had to return int instead of bool, otherwise there may be a mismatch
   // between the C calling convention and the Java one.
   // e.g., on x86, GCC may clear only %al when returning a bool false, but
   // JVM takes the whole %eax as the return value, which may misinterpret
   // the return value as a boolean true.
   assert(mirror != NULL, "should null-check on mirror before calling");
   Klass* k = java_lang_Class::as_Klass(mirror);
   return (k != NULL && obj != NULL && obj->is_a(k)) ? 1 : 0;
 JRT_END
 JRT_ENTRY(void, Runtime1::predicate_failed_trap(JavaThread* thread))
   ResourceMark rm;
   assert(!TieredCompilation, "incompatible with tiered compilation");
   RegisterMap reg_map(thread, false);
   frame runtime_frame = thread->last_frame();
   frame caller_frame = runtime_frame.sender(&reg_map);
   nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
   assert (nm != NULL, "no more nmethod?");
   nm->make_not_entrant();
   methodHandle m(nm->method());
   MethodData* mdo = m->method_data();
   if (mdo == NULL && !HAS_PENDING_EXCEPTION) {
     // Build an MDO.  Ignore errors like OutOfMemory;
     // that simply means we won't have an MDO to update.
     Method::build_interpreter_method_data(m, THREAD);
     if (HAS_PENDING_EXCEPTION) {
       assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
       CLEAR_PENDING_EXCEPTION;
     }
     mdo = m->method_data();
   }
   if (mdo != NULL) {
     mdo->inc_trap_count(Deoptimization::Reason_none);
   }
   if (TracePredicateFailedTraps) {
     stringStream ss1, ss2;
     vframeStream vfst(thread);
     methodHandle inlinee = methodHandle(vfst.method());
     inlinee->print_short_name(&ss1);
     m->print_short_name(&ss2);
     tty->print_cr("Predicate failed trap in method %s at bci %d inlined in %s at pc %x", ss1.as_string(), vfst.bci(), ss2.as_string(), caller_frame.pc());
   }
   Deoptimization::deoptimize_frame(thread, caller_frame.id());
 JRT_END
 #ifndef PRODUCT
 void Runtime1::print_statistics() {
   tty->print_cr("C1 Runtime statistics:");
   tty->print_cr(" _resolve_invoke_virtual_cnt:     %d", SharedRuntime::_resolve_virtual_ctr);
   tty->print_cr(" _resolve_invoke_opt_virtual_cnt: %d", SharedRuntime::_resolve_opt_virtual_ctr);
   tty->print_cr(" _resolve_invoke_static_cnt:      %d", SharedRuntime::_resolve_static_ctr);
   tty->print_cr(" _handle_wrong_method_cnt:        %d", SharedRuntime::_wrong_method_ctr);
   tty->print_cr(" _ic_miss_cnt:                    %d", SharedRuntime::_ic_miss_ctr);
   tty->print_cr(" _generic_arraycopy_cnt:          %d", _generic_arraycopy_cnt);
   tty->print_cr(" _generic_arraycopystub_cnt:      %d", _generic_arraycopystub_cnt);
   tty->print_cr(" _byte_arraycopy_cnt:             %d", _byte_arraycopy_cnt);
   tty->print_cr(" _short_arraycopy_cnt:            %d", _short_arraycopy_cnt);
   tty->print_cr(" _int_arraycopy_cnt:              %d", _int_arraycopy_cnt);
   tty->print_cr(" _long_arraycopy_cnt:             %d", _long_arraycopy_cnt);
   tty->print_cr(" _primitive_arraycopy_cnt:        %d", _primitive_arraycopy_cnt);
   tty->print_cr(" _oop_arraycopy_cnt (C):          %d", Runtime1::_oop_arraycopy_cnt);
   tty->print_cr(" _oop_arraycopy_cnt (stub):       %d", _oop_arraycopy_cnt);
   tty->print_cr(" _arraycopy_slowcase_cnt:         %d", _arraycopy_slowcase_cnt);
   tty->print_cr(" _arraycopy_checkcast_cnt:        %d", _arraycopy_checkcast_cnt);
   tty->print_cr(" _arraycopy_checkcast_attempt_cnt:%d", _arraycopy_checkcast_attempt_cnt);
   tty->print_cr(" _new_type_array_slowcase_cnt:    %d", _new_type_array_slowcase_cnt);
   tty->print_cr(" _new_object_array_slowcase_cnt:  %d", _new_object_array_slowcase_cnt);
   tty->print_cr(" _new_instance_slowcase_cnt:      %d", _new_instance_slowcase_cnt);
   tty->print_cr(" _new_multi_array_slowcase_cnt:   %d", _new_multi_array_slowcase_cnt);
   tty->print_cr(" _monitorenter_slowcase_cnt:      %d", _monitorenter_slowcase_cnt);
   tty->print_cr(" _monitorexit_slowcase_cnt:       %d", _monitorexit_slowcase_cnt);
   tty->print_cr(" _patch_code_slowcase_cnt:        %d", _patch_code_slowcase_cnt);
   tty->print_cr(" _throw_range_check_exception_count:            %d:", _throw_range_check_exception_count);
   tty->print_cr(" _throw_index_exception_count:                  %d:", _throw_index_exception_count);
   tty->print_cr(" _throw_div0_exception_count:                   %d:", _throw_div0_exception_count);
   tty->print_cr(" _throw_null_pointer_exception_count:           %d:", _throw_null_pointer_exception_count);
   tty->print_cr(" _throw_class_cast_exception_count:             %d:", _throw_class_cast_exception_count);
   tty->print_cr(" _throw_incompatible_class_change_error_count:  %d:", _throw_incompatible_class_change_error_count);
   tty->print_cr(" _throw_array_store_exception_count:            %d:", _throw_array_store_exception_count);
   tty->print_cr(" _throw_count:                                  %d:", _throw_count);
   SharedRuntime::print_ic_miss_histogram();
   tty->cr();
 }
 #endif // PRODUCT

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/c1/c1_Runtime1.cpp@190899198332 (annotated)

src/share/vm/c1/c1_Runtime1.cpp