Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 1997-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 #include "incls/_precompiled.incl"

 #include "incls/_sharedRuntime.cpp.incl"

 #include <math.h>

 HS_DTRACE_PROBE_DECL4(hotspot, object__alloc, Thread*, char*, int, size_t);

 HS_DTRACE_PROBE_DECL7(hotspot, method__entry, int,

                       char*, int, char*, int, char*, int);

 HS_DTRACE_PROBE_DECL7(hotspot, method__return, int,

                       char*, int, char*, int, char*, int);

 // Implementation of SharedRuntime

 #ifndef PRODUCT

 // For statistics

 int SharedRuntime::_ic_miss_ctr = 0;

 int SharedRuntime::_wrong_method_ctr = 0;

 int SharedRuntime::_resolve_static_ctr = 0;

 int SharedRuntime::_resolve_virtual_ctr = 0;

 int SharedRuntime::_resolve_opt_virtual_ctr = 0;

 int SharedRuntime::_implicit_null_throws = 0;

 int SharedRuntime::_implicit_div0_throws = 0;

 int SharedRuntime::_throw_null_ctr = 0;

 int SharedRuntime::_nof_normal_calls = 0;

 int SharedRuntime::_nof_optimized_calls = 0;

 int SharedRuntime::_nof_inlined_calls = 0;

 int SharedRuntime::_nof_megamorphic_calls = 0;

 int SharedRuntime::_nof_static_calls = 0;

 int SharedRuntime::_nof_inlined_static_calls = 0;

 int SharedRuntime::_nof_interface_calls = 0;

 int SharedRuntime::_nof_optimized_interface_calls = 0;

 int SharedRuntime::_nof_inlined_interface_calls = 0;

 int SharedRuntime::_nof_megamorphic_interface_calls = 0;

 int SharedRuntime::_nof_removable_exceptions = 0;

 int SharedRuntime::_new_instance_ctr=0;

 int SharedRuntime::_new_array_ctr=0;

 int SharedRuntime::_multi1_ctr=0;

 int SharedRuntime::_multi2_ctr=0;

 int SharedRuntime::_multi3_ctr=0;

 int SharedRuntime::_multi4_ctr=0;

 int SharedRuntime::_multi5_ctr=0;

 int SharedRuntime::_mon_enter_stub_ctr=0;

 int SharedRuntime::_mon_exit_stub_ctr=0;

 int SharedRuntime::_mon_enter_ctr=0;

 int SharedRuntime::_mon_exit_ctr=0;

 int SharedRuntime::_partial_subtype_ctr=0;

 int SharedRuntime::_jbyte_array_copy_ctr=0;

 int SharedRuntime::_jshort_array_copy_ctr=0;

 int SharedRuntime::_jint_array_copy_ctr=0;

 int SharedRuntime::_jlong_array_copy_ctr=0;

 int SharedRuntime::_oop_array_copy_ctr=0;

 int SharedRuntime::_checkcast_array_copy_ctr=0;

 int SharedRuntime::_unsafe_array_copy_ctr=0;

 int SharedRuntime::_generic_array_copy_ctr=0;

 int SharedRuntime::_slow_array_copy_ctr=0;

 int SharedRuntime::_find_handler_ctr=0;

 int SharedRuntime::_rethrow_ctr=0;

 int     SharedRuntime::_ICmiss_index                    = 0;

 int     SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];

 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];

 void SharedRuntime::trace_ic_miss(address at) {

   for (int i = 0; i < _ICmiss_index; i++) {

     if (_ICmiss_at[i] == at) {

       _ICmiss_count[i]++;

       return;

     }

   }

   int index = _ICmiss_index++;

   if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;

   _ICmiss_at[index] = at;

   _ICmiss_count[index] = 1;

 }

 void SharedRuntime::print_ic_miss_histogram() {

   if (ICMissHistogram) {

     tty->print_cr ("IC Miss Histogram:");

     int tot_misses = 0;

     for (int i = 0; i < _ICmiss_index; i++) {

       tty->print_cr("  at: " INTPTR_FORMAT "  nof: %d", _ICmiss_at[i], _ICmiss_count[i]);

       tot_misses += _ICmiss_count[i];

     }

     tty->print_cr ("Total IC misses: %7d", tot_misses);

   }

 }

 #endif // PRODUCT

 #ifndef SERIALGC

 // G1 write-barrier pre: executed before a pointer store.

 JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread))

   if (orig == NULL) {

     assert(false, "should be optimized out");

     return;

   }

   // store the original value that was in the field reference

   thread->satb_mark_queue().enqueue(orig);

 JRT_END

 // G1 write-barrier post: executed after a pointer store.

 JRT_LEAF(void, SharedRuntime::g1_wb_post(void* card_addr, JavaThread* thread))

   thread->dirty_card_queue().enqueue(card_addr);

 JRT_END

 #endif // !SERIALGC

 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))

   return x * y;

 JRT_END

 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))

   if (x == min_jlong && y == CONST64(-1)) {

     return x;

   } else {

     return x / y;

   }

 JRT_END

 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))

   if (x == min_jlong && y == CONST64(-1)) {

     return 0;

   } else {

     return x % y;

   }

 JRT_END

 const juint  float_sign_mask  = 0x7FFFFFFF;

 const juint  float_infinity   = 0x7F800000;

 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);

 const julong double_infinity  = CONST64(0x7FF0000000000000);

 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat  x, jfloat  y))

 #ifdef _WIN64

   // 64-bit Windows on amd64 returns the wrong values for

   // infinity operands.

   union { jfloat f; juint i; } xbits, ybits;

   xbits.f = x;

   ybits.f = y;

   // x Mod Infinity == x unless x is infinity

   if ( ((xbits.i & float_sign_mask) != float_infinity) &&

        ((ybits.i & float_sign_mask) == float_infinity) ) {

     return x;

   }

 #endif

   return ((jfloat)fmod((double)x,(double)y));

 JRT_END

 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))

 #ifdef _WIN64

   union { jdouble d; julong l; } xbits, ybits;

   xbits.d = x;

   ybits.d = y;

   // x Mod Infinity == x unless x is infinity

   if ( ((xbits.l & double_sign_mask) != double_infinity) &&

        ((ybits.l & double_sign_mask) == double_infinity) ) {

     return x;

   }

 #endif

   return ((jdouble)fmod((double)x,(double)y));

 JRT_END

 JRT_LEAF(jint, SharedRuntime::f2i(jfloat  x))

   if (g_isnan(x))

     return 0;

   if (x >= (jfloat) max_jint)

     return max_jint;

   if (x <= (jfloat) min_jint)

     return min_jint;

   return (jint) x;

 JRT_END

 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat  x))

   if (g_isnan(x))

     return 0;

   if (x >= (jfloat) max_jlong)

     return max_jlong;

   if (x <= (jfloat) min_jlong)

     return min_jlong;

   return (jlong) x;

 JRT_END

 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))

   if (g_isnan(x))

     return 0;

   if (x >= (jdouble) max_jint)

     return max_jint;

   if (x <= (jdouble) min_jint)

     return min_jint;

   return (jint) x;

 JRT_END

 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))

   if (g_isnan(x))

     return 0;

   if (x >= (jdouble) max_jlong)

     return max_jlong;

   if (x <= (jdouble) min_jlong)

     return min_jlong;

   return (jlong) x;

 JRT_END

 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))

   return (jfloat)x;

 JRT_END

 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))

   return (jfloat)x;

 JRT_END

 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))

   return (jdouble)x;

 JRT_END

 // Exception handling accross interpreter/compiler boundaries

 //

 // exception_handler_for_return_address(...) returns the continuation address.

 // The continuation address is the entry point of the exception handler of the

 // previous frame depending on the return address.

 address SharedRuntime::raw_exception_handler_for_return_address(address return_address) {

   assert(frame::verify_return_pc(return_address), "must be a return pc");

   // the fastest case first

   CodeBlob* blob = CodeCache::find_blob(return_address);

   if (blob != NULL && blob->is_nmethod()) {

     nmethod* code = (nmethod*)blob;

     assert(code != NULL, "nmethod must be present");

     // native nmethods don't have exception handlers

     assert(!code->is_native_method(), "no exception handler");

     assert(code->header_begin() != code->exception_begin(), "no exception handler");

     if (code->is_deopt_pc(return_address)) {

       return SharedRuntime::deopt_blob()->unpack_with_exception();

     } else {

       return code->exception_begin();

     }

   }

   // Entry code

   if (StubRoutines::returns_to_call_stub(return_address)) {

     return StubRoutines::catch_exception_entry();

   }

   // Interpreted code

   if (Interpreter::contains(return_address)) {

     return Interpreter::rethrow_exception_entry();

   }

   // Compiled code

   if (CodeCache::contains(return_address)) {

     CodeBlob* blob = CodeCache::find_blob(return_address);

     if (blob->is_nmethod()) {

       nmethod* code = (nmethod*)blob;

       assert(code != NULL, "nmethod must be present");

       assert(code->header_begin() != code->exception_begin(), "no exception handler");

       return code->exception_begin();

     }

     if (blob->is_runtime_stub()) {

       ShouldNotReachHere();   // callers are responsible for skipping runtime stub frames

     }

   }

   guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!");

 #ifndef PRODUCT

   { ResourceMark rm;

     tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", return_address);

     tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");

     tty->print_cr("b) other problem");

   }

 #endif // PRODUCT

   ShouldNotReachHere();

   return NULL;

 }

 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(address return_address))

   return raw_exception_handler_for_return_address(return_address);

 JRT_END

 address SharedRuntime::get_poll_stub(address pc) {

   address stub;

   // Look up the code blob

   CodeBlob *cb = CodeCache::find_blob(pc);

   // Should be an nmethod

   assert( cb && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod" );

   // Look up the relocation information

   assert( ((nmethod*)cb)->is_at_poll_or_poll_return(pc),

     "safepoint polling: type must be poll" );

   assert( ((NativeInstruction*)pc)->is_safepoint_poll(),

     "Only polling locations are used for safepoint");

   bool at_poll_return = ((nmethod*)cb)->is_at_poll_return(pc);

   if (at_poll_return) {

     assert(SharedRuntime::polling_page_return_handler_blob() != NULL,

            "polling page return stub not created yet");

     stub = SharedRuntime::polling_page_return_handler_blob()->instructions_begin();

   } else {

     assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL,

            "polling page safepoint stub not created yet");

     stub = SharedRuntime::polling_page_safepoint_handler_blob()->instructions_begin();

   }

 #ifndef PRODUCT

   if( TraceSafepoint ) {

     char buf[256];

     jio_snprintf(buf, sizeof(buf),

                  "... found polling page %s exception at pc = "

                  INTPTR_FORMAT ", stub =" INTPTR_FORMAT,

                  at_poll_return ? "return" : "loop",

                  (intptr_t)pc, (intptr_t)stub);

     tty->print_raw_cr(buf);

   }

 #endif // PRODUCT

   return stub;

 }

 oop SharedRuntime::retrieve_receiver( symbolHandle sig, frame caller ) {

   assert(caller.is_interpreted_frame(), "");

   int args_size = ArgumentSizeComputer(sig).size() + 1;

   assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack");

   oop result = (oop) *caller.interpreter_frame_tos_at(args_size - 1);

   assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop");

   return result;

 }

 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) {

   if (JvmtiExport::can_post_exceptions()) {

     vframeStream vfst(thread, true);

     methodHandle method = methodHandle(thread, vfst.method());

     address bcp = method()->bcp_from(vfst.bci());

     JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception());

   }

   Exceptions::_throw(thread, __FILE__, __LINE__, h_exception);

 }

 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, symbolOop name, const char *message) {

   Handle h_exception = Exceptions::new_exception(thread, name, message);

   throw_and_post_jvmti_exception(thread, h_exception);

 }

 // The interpreter code to call this tracing function is only

 // called/generated when TraceRedefineClasses has the right bits

 // set. Since obsolete methods are never compiled, we don't have

 // to modify the compilers to generate calls to this function.

 //

 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(

     JavaThread* thread, methodOopDesc* method))

   assert(RC_TRACE_IN_RANGE(0x00001000, 0x00002000), "wrong call");

   if (method->is_obsolete()) {

     // We are calling an obsolete method, but this is not necessarily

     // an error. Our method could have been redefined just after we

     // fetched the methodOop from the constant pool.

     // RC_TRACE macro has an embedded ResourceMark

     RC_TRACE_WITH_THREAD(0x00001000, thread,

                          ("calling obsolete method '%s'",

                           method->name_and_sig_as_C_string()));

     if (RC_TRACE_ENABLED(0x00002000)) {

       // this option is provided to debug calls to obsolete methods

       guarantee(false, "faulting at call to an obsolete method.");

     }

   }

   return 0;

 JRT_END

 // ret_pc points into caller; we are returning caller's exception handler

 // for given exception

 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,

                                                     bool force_unwind, bool top_frame_only) {

   assert(nm != NULL, "must exist");

   ResourceMark rm;

   ScopeDesc* sd = nm->scope_desc_at(ret_pc);

   // determine handler bci, if any

   EXCEPTION_MARK;

   int handler_bci = -1;

   int scope_depth = 0;

   if (!force_unwind) {

     int bci = sd->bci();

     do {

       bool skip_scope_increment = false;

       // exception handler lookup

       KlassHandle ek (THREAD, exception->klass());

       handler_bci = sd->method()->fast_exception_handler_bci_for(ek, bci, THREAD);

       if (HAS_PENDING_EXCEPTION) {

         // We threw an exception while trying to find the exception handler.

         // Transfer the new exception to the exception handle which will

         // be set into thread local storage, and do another lookup for an

         // exception handler for this exception, this time starting at the

         // BCI of the exception handler which caused the exception to be

         // thrown (bugs 4307310 and 4546590). Set "exception" reference

         // argument to ensure that the correct exception is thrown (4870175).

         exception = Handle(THREAD, PENDING_EXCEPTION);

         CLEAR_PENDING_EXCEPTION;

         if (handler_bci >= 0) {

           bci = handler_bci;

           handler_bci = -1;

           skip_scope_increment = true;

         }

       }

       if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {

         sd = sd->sender();

         if (sd != NULL) {

           bci = sd->bci();

         }

         ++scope_depth;

       }

     } while (!top_frame_only && handler_bci < 0 && sd != NULL);

   }

   // found handling method => lookup exception handler

   int catch_pco = ret_pc - nm->instructions_begin();

   ExceptionHandlerTable table(nm);

   HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);

   if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) {

     // Allow abbreviated catch tables.  The idea is to allow a method

     // to materialize its exceptions without committing to the exact

     // routing of exceptions.  In particular this is needed for adding

     // a synthethic handler to unlock monitors when inlining

     // synchonized methods since the unlock path isn't represented in

     // the bytecodes.

     t = table.entry_for(catch_pco, -1, 0);

   }

 #ifdef COMPILER1

   if (nm->is_compiled_by_c1() && t == NULL && handler_bci == -1) {

     // Exception is not handled by this frame so unwind.  Note that

     // this is not the same as how C2 does this.  C2 emits a table

     // entry that dispatches to the unwind code in the nmethod.

     return NULL;

   }

 #endif /* COMPILER1 */

   if (t == NULL) {

     tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", ret_pc, handler_bci);

     tty->print_cr("   Exception:");

     exception->print();

     tty->cr();

     tty->print_cr(" Compiled exception table :");

     table.print();

     nm->print_code();

     guarantee(false, "missing exception handler");

     return NULL;

   }

   return nm->instructions_begin() + t->pco();

 }

 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread))

   // These errors occur only at call sites

   throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());

 JRT_END

 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))

   // These errors occur only at call sites

   throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");

 JRT_END

 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))

   throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");

 JRT_END

 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread))

   throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());

 JRT_END

 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread))

   // This entry point is effectively only used for NullPointerExceptions which occur at inline

   // cache sites (when the callee activation is not yet set up) so we are at a call site

   throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());

 JRT_END

 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))

   // We avoid using the normal exception construction in this case because

   // it performs an upcall to Java, and we're already out of stack space.

   klassOop k = SystemDictionary::StackOverflowError_klass();

   oop exception_oop = instanceKlass::cast(k)->allocate_instance(CHECK);

   Handle exception (thread, exception_oop);

   if (StackTraceInThrowable) {

     java_lang_Throwable::fill_in_stack_trace(exception);

   }

   throw_and_post_jvmti_exception(thread, exception);

 JRT_END

 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread,

                                                            address pc,

                                                            SharedRuntime::ImplicitExceptionKind exception_kind)

 {

   address target_pc = NULL;

   if (Interpreter::contains(pc)) {

 #ifdef CC_INTERP

     // C++ interpreter doesn't throw implicit exceptions

     ShouldNotReachHere();

 #else

     switch (exception_kind) {

       case IMPLICIT_NULL:           return Interpreter::throw_NullPointerException_entry();

       case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();

       case STACK_OVERFLOW:          return Interpreter::throw_StackOverflowError_entry();

       default:                      ShouldNotReachHere();

     }

 #endif // !CC_INTERP

   } else {

     switch (exception_kind) {

       case STACK_OVERFLOW: {

         // Stack overflow only occurs upon frame setup; the callee is

         // going to be unwound. Dispatch to a shared runtime stub

         // which will cause the StackOverflowError to be fabricated

         // and processed.

         // For stack overflow in deoptimization blob, cleanup thread.

         if (thread->deopt_mark() != NULL) {

           Deoptimization::cleanup_deopt_info(thread, NULL);

         }

         return StubRoutines::throw_StackOverflowError_entry();

       }

       case IMPLICIT_NULL: {

         if (VtableStubs::contains(pc)) {

           // We haven't yet entered the callee frame. Fabricate an

           // exception and begin dispatching it in the caller. Since

           // the caller was at a call site, it's safe to destroy all

           // caller-saved registers, as these entry points do.

           VtableStub* vt_stub = VtableStubs::stub_containing(pc);

           // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error.

           if (vt_stub == NULL) return NULL;

           if (vt_stub->is_abstract_method_error(pc)) {

             assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");

             return StubRoutines::throw_AbstractMethodError_entry();

           } else {

             return StubRoutines::throw_NullPointerException_at_call_entry();

           }

         } else {

           CodeBlob* cb = CodeCache::find_blob(pc);

           // If code blob is NULL, then return NULL to signal handler to report the SEGV error.

           if (cb == NULL) return NULL;

           // Exception happened in CodeCache. Must be either:

           // 1. Inline-cache check in C2I handler blob,

           // 2. Inline-cache check in nmethod, or

           // 3. Implict null exception in nmethod

           if (!cb->is_nmethod()) {

             guarantee(cb->is_adapter_blob(),

                       "exception happened outside interpreter, nmethods and vtable stubs (1)");

             // There is no handler here, so we will simply unwind.

             return StubRoutines::throw_NullPointerException_at_call_entry();

           }

           // Otherwise, it's an nmethod.  Consult its exception handlers.

           nmethod* nm = (nmethod*)cb;

           if (nm->inlinecache_check_contains(pc)) {

             // exception happened inside inline-cache check code

             // => the nmethod is not yet active (i.e., the frame

             // is not set up yet) => use return address pushed by

             // caller => don't push another return address

             return StubRoutines::throw_NullPointerException_at_call_entry();

           }

 #ifndef PRODUCT

           _implicit_null_throws++;

 #endif

           target_pc = nm->continuation_for_implicit_exception(pc);

           guarantee(target_pc != 0, "must have a continuation point");

         }

         break; // fall through

       }

       case IMPLICIT_DIVIDE_BY_ZERO: {

         nmethod* nm = CodeCache::find_nmethod(pc);

         guarantee(nm != NULL, "must have containing nmethod for implicit division-by-zero exceptions");

 #ifndef PRODUCT

         _implicit_div0_throws++;

 #endif

         target_pc = nm->continuation_for_implicit_exception(pc);

         guarantee(target_pc != 0, "must have a continuation point");

         break; // fall through

       }

       default: ShouldNotReachHere();

     }

     guarantee(target_pc != NULL, "must have computed destination PC for implicit exception");

     assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");

     // for AbortVMOnException flag

     NOT_PRODUCT(Exceptions::debug_check_abort("java.lang.NullPointerException"));

     if (exception_kind == IMPLICIT_NULL) {

       Events::log("Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);

     } else {

       Events::log("Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);

     }

     return target_pc;

   }

   ShouldNotReachHere();

   return NULL;

 }

 JNI_ENTRY(void, throw_unsatisfied_link_error(JNIEnv* env, ...))

 {

   THROW(vmSymbols::java_lang_UnsatisfiedLinkError());

 }

 JNI_END

 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {

   return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);

 }

 #ifndef PRODUCT

 JRT_ENTRY(intptr_t, SharedRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))

   const frame f = thread->last_frame();

   assert(f.is_interpreted_frame(), "must be an interpreted frame");

 #ifndef PRODUCT

   methodHandle mh(THREAD, f.interpreter_frame_method());

   BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2);

 #endif // !PRODUCT

   return preserve_this_value;

 JRT_END

 #endif // !PRODUCT

 JRT_ENTRY(void, SharedRuntime::yield_all(JavaThread* thread, int attempts))

   os::yield_all(attempts);

 JRT_END

 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))

   assert(obj->is_oop(), "must be a valid oop");

   assert(obj->klass()->klass_part()->has_finalizer(), "shouldn't be here otherwise");

   instanceKlass::register_finalizer(instanceOop(obj), CHECK);

 JRT_END

 jlong SharedRuntime::get_java_tid(Thread* thread) {

   if (thread != NULL) {

     if (thread->is_Java_thread()) {

       oop obj = ((JavaThread*)thread)->threadObj();

       return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);

     }

   }

   return 0;

 }

 /**

  * This function ought to be a void function, but cannot be because

  * it gets turned into a tail-call on sparc, which runs into dtrace bug

  * 6254741.  Once that is fixed we can remove the dummy return value.

  */

 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {

   return dtrace_object_alloc_base(Thread::current(), o);

 }

 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o) {

   assert(DTraceAllocProbes, "wrong call");

   Klass* klass = o->blueprint();

   int size = o->size();

   symbolOop name = klass->name();

   HS_DTRACE_PROBE4(hotspot, object__alloc, get_java_tid(thread),

                    name->bytes(), name->utf8_length(), size * HeapWordSize);

   return 0;

 }

 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(

     JavaThread* thread, methodOopDesc* method))

   assert(DTraceMethodProbes, "wrong call");

   symbolOop kname = method->klass_name();

   symbolOop name = method->name();

   symbolOop sig = method->signature();

   HS_DTRACE_PROBE7(hotspot, method__entry, get_java_tid(thread),

       kname->bytes(), kname->utf8_length(),

       name->bytes(), name->utf8_length(),

       sig->bytes(), sig->utf8_length());

   return 0;

 JRT_END

 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(

     JavaThread* thread, methodOopDesc* method))

   assert(DTraceMethodProbes, "wrong call");

   symbolOop kname = method->klass_name();

   symbolOop name = method->name();

   symbolOop sig = method->signature();

   HS_DTRACE_PROBE7(hotspot, method__return, get_java_tid(thread),

       kname->bytes(), kname->utf8_length(),

       name->bytes(), name->utf8_length(),

       sig->bytes(), sig->utf8_length());

   return 0;

 JRT_END

 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)

 // for a call current in progress, i.e., arguments has been pushed on stack

 // put callee has not been invoked yet.  Used by: resolve virtual/static,

 // vtable updates, etc.  Caller frame must be compiled.

 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {

   ResourceMark rm(THREAD);

   // last java frame on stack (which includes native call frames)

   vframeStream vfst(thread, true);  // Do not skip and javaCalls

   return find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(Handle()));

 }

 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode

 // for a call current in progress, i.e., arguments has been pushed on stack

 // but callee has not been invoked yet.  Caller frame must be compiled.

 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,

                                               vframeStream& vfst,

                                               Bytecodes::Code& bc,

                                               CallInfo& callinfo, TRAPS) {

   Handle receiver;

   Handle nullHandle;  //create a handy null handle for exception returns

   assert(!vfst.at_end(), "Java frame must exist");

   // Find caller and bci from vframe

   methodHandle caller (THREAD, vfst.method());

   int          bci    = vfst.bci();

   // Find bytecode

   Bytecode_invoke* bytecode = Bytecode_invoke_at(caller, bci);

   bc = bytecode->adjusted_invoke_code();

   int bytecode_index = bytecode->index();

   // Find receiver for non-static call

   if (bc != Bytecodes::_invokestatic) {

     // This register map must be update since we need to find the receiver for

     // compiled frames. The receiver might be in a register.

     RegisterMap reg_map2(thread);

     frame stubFrame   = thread->last_frame();

     // Caller-frame is a compiled frame

     frame callerFrame = stubFrame.sender(&reg_map2);

     methodHandle callee = bytecode->static_target(CHECK_(nullHandle));

     if (callee.is_null()) {

       THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);

     }

     // Retrieve from a compiled argument list

     receiver = Handle(THREAD, callerFrame.retrieve_receiver(&reg_map2));

     if (receiver.is_null()) {

       THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);

     }

   }

   // Resolve method. This is parameterized by bytecode.

   constantPoolHandle constants (THREAD, caller->constants());

   assert (receiver.is_null() || receiver->is_oop(), "wrong receiver");

   LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_(nullHandle));

 #ifdef ASSERT

   // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls

   if (bc != Bytecodes::_invokestatic) {

     assert(receiver.not_null(), "should have thrown exception");

     KlassHandle receiver_klass (THREAD, receiver->klass());

     klassOop rk = constants->klass_ref_at(bytecode_index, CHECK_(nullHandle));

                             // klass is already loaded

     KlassHandle static_receiver_klass (THREAD, rk);

     assert(receiver_klass->is_subtype_of(static_receiver_klass()), "actual receiver must be subclass of static receiver klass");

     if (receiver_klass->oop_is_instance()) {

       if (instanceKlass::cast(receiver_klass())->is_not_initialized()) {

         tty->print_cr("ERROR: Klass not yet initialized!!");

         receiver_klass.print();

       }

       assert (!instanceKlass::cast(receiver_klass())->is_not_initialized(), "receiver_klass must be initialized");

     }

   }

 #endif

   return receiver;

 }

 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {

   ResourceMark rm(THREAD);

   // We need first to check if any Java activations (compiled, interpreted)

   // exist on the stack since last JavaCall.  If not, we need

   // to get the target method from the JavaCall wrapper.

   vframeStream vfst(thread, true);  // Do not skip any javaCalls

   methodHandle callee_method;

   if (vfst.at_end()) {

     // No Java frames were found on stack since we did the JavaCall.

     // Hence the stack can only contain an entry_frame.  We need to

     // find the target method from the stub frame.

     RegisterMap reg_map(thread, false);

     frame fr = thread->last_frame();

     assert(fr.is_runtime_frame(), "must be a runtimeStub");

     fr = fr.sender(&reg_map);

     assert(fr.is_entry_frame(), "must be");

     // fr is now pointing to the entry frame.

     callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());

     assert(fr.entry_frame_call_wrapper()->receiver() == NULL || !callee_method->is_static(), "non-null receiver for static call??");

   } else {

     Bytecodes::Code bc;

     CallInfo callinfo;

     find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));

     callee_method = callinfo.selected_method();

   }

   assert(callee_method()->is_method(), "must be");

   return callee_method;

 }

 // Resolves a call.

 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,

                                            bool is_virtual,

                                            bool is_optimized, TRAPS) {

   methodHandle callee_method;

   callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);

   if (JvmtiExport::can_hotswap_or_post_breakpoint()) {

     int retry_count = 0;

     while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&

            callee_method->method_holder() != SystemDictionary::object_klass()) {

       // If has a pending exception then there is no need to re-try to

       // resolve this method.

       // If the method has been redefined, we need to try again.

       // Hack: we have no way to update the vtables of arrays, so don't

       // require that java.lang.Object has been updated.

       // It is very unlikely that method is redefined more than 100 times

       // in the middle of resolve. If it is looping here more than 100 times

       // means then there could be a bug here.

       guarantee((retry_count++ < 100),

                 "Could not resolve to latest version of redefined method");

       // method is redefined in the middle of resolve so re-try.

       callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);

     }

   }

   return callee_method;

 }

 // Resolves a call.  The compilers generate code for calls that go here

 // and are patched with the real destination of the call.

 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,

                                            bool is_virtual,

                                            bool is_optimized, TRAPS) {

   ResourceMark rm(thread);

   RegisterMap cbl_map(thread, false);

   frame caller_frame = thread->last_frame().sender(&cbl_map);

   CodeBlob* cb = caller_frame.cb();

   guarantee(cb != NULL && cb->is_nmethod(), "must be called from nmethod");

   // make sure caller is not getting deoptimized

   // and removed before we are done with it.

   // CLEANUP - with lazy deopt shouldn't need this lock

   nmethodLocker caller_lock((nmethod*)cb);

   // determine call info & receiver

   // note: a) receiver is NULL for static calls

   //       b) an exception is thrown if receiver is NULL for non-static calls

   CallInfo call_info;

   Bytecodes::Code invoke_code = Bytecodes::_illegal;

   Handle receiver = find_callee_info(thread, invoke_code,

                                      call_info, CHECK_(methodHandle()));

   methodHandle callee_method = call_info.selected_method();

   assert((!is_virtual && invoke_code == Bytecodes::_invokestatic) ||

          ( is_virtual && invoke_code != Bytecodes::_invokestatic), "inconsistent bytecode");

 #ifndef PRODUCT

   // tracing/debugging/statistics

   int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :

                 (is_virtual) ? (&_resolve_virtual_ctr) :

                                (&_resolve_static_ctr);

   Atomic::inc(addr);

   if (TraceCallFixup) {

     ResourceMark rm(thread);

     tty->print("resolving %s%s (%s) call to",

       (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",

       Bytecodes::name(invoke_code));

     callee_method->print_short_name(tty);

     tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());

   }

 #endif

   // Compute entry points. This might require generation of C2I converter

   // frames, so we cannot be holding any locks here. Furthermore, the

   // computation of the entry points is independent of patching the call.  We

   // always return the entry-point, but we only patch the stub if the call has

   // not been deoptimized.  Return values: For a virtual call this is an

   // (cached_oop, destination address) pair. For a static call/optimized

   // virtual this is just a destination address.

   StaticCallInfo static_call_info;

   CompiledICInfo virtual_call_info;

   // Make sure the callee nmethod does not get deoptimized and removed before

   // we are done patching the code.

   nmethod* nm = callee_method->code();

   nmethodLocker nl_callee(nm);

 #ifdef ASSERT

   address dest_entry_point = nm == NULL ? 0 : nm->entry_point(); // used below

 #endif

   if (is_virtual) {

     assert(receiver.not_null(), "sanity check");

     bool static_bound = call_info.resolved_method()->can_be_statically_bound();

     KlassHandle h_klass(THREAD, receiver->klass());

     CompiledIC::compute_monomorphic_entry(callee_method, h_klass,

                      is_optimized, static_bound, virtual_call_info,

                      CHECK_(methodHandle()));

   } else {

     // static call

     CompiledStaticCall::compute_entry(callee_method, static_call_info);

   }

   // grab lock, check for deoptimization and potentially patch caller

   {

     MutexLocker ml_patch(CompiledIC_lock);

     // Now that we are ready to patch if the methodOop was redefined then

     // don't update call site and let the caller retry.

     if (!callee_method->is_old()) {

 #ifdef ASSERT

       // We must not try to patch to jump to an already unloaded method.

       if (dest_entry_point != 0) {

         assert(CodeCache::find_blob(dest_entry_point) != NULL,

                "should not unload nmethod while locked");

       }

 #endif

       if (is_virtual) {

         CompiledIC* inline_cache = CompiledIC_before(caller_frame.pc());

         if (inline_cache->is_clean()) {

           inline_cache->set_to_monomorphic(virtual_call_info);

         }

       } else {

         CompiledStaticCall* ssc = compiledStaticCall_before(caller_frame.pc());

         if (ssc->is_clean()) ssc->set(static_call_info);

       }

     }

   } // unlock CompiledIC_lock

   return callee_method;

 }

 // Inline caches exist only in compiled code

 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))

 #ifdef ASSERT

   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);

   assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");

 #endif /* ASSERT */

   methodHandle callee_method;

   JRT_BLOCK

     callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL);

     // Return methodOop through TLS

     thread->set_vm_result(callee_method());

   JRT_BLOCK_END

   // return compiled code entry point after potential safepoints

   assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");

   return callee_method->verified_code_entry();

 JRT_END

 // Handle call site that has been made non-entrant

 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))

   // 6243940 We might end up in here if the callee is deoptimized

   // as we race to call it.  We don't want to take a safepoint if

   // the caller was interpreted because the caller frame will look

   // interpreted to the stack walkers and arguments are now

   // "compiled" so it is much better to make this transition

   // invisible to the stack walking code. The i2c path will

   // place the callee method in the callee_target. It is stashed

   // there because if we try and find the callee by normal means a

   // safepoint is possible and have trouble gc'ing the compiled args.

   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);

   if (caller_frame.is_interpreted_frame() || caller_frame.is_entry_frame() ) {

     methodOop callee = thread->callee_target();

     guarantee(callee != NULL && callee->is_method(), "bad handshake");

     thread->set_vm_result(callee);

     thread->set_callee_target(NULL);

     return callee->get_c2i_entry();

   }

   // Must be compiled to compiled path which is safe to stackwalk

   methodHandle callee_method;

   JRT_BLOCK

     // Force resolving of caller (if we called from compiled frame)

     callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL);

     thread->set_vm_result(callee_method());

   JRT_BLOCK_END

   // return compiled code entry point after potential safepoints

   assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");

   return callee_method->verified_code_entry();

 JRT_END

 // resolve a static call and patch code

 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))

   methodHandle callee_method;

   JRT_BLOCK

     callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL);

     thread->set_vm_result(callee_method());

   JRT_BLOCK_END

   // return compiled code entry point after potential safepoints

   assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");

   return callee_method->verified_code_entry();

 JRT_END

 // resolve virtual call and update inline cache to monomorphic

 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))

   methodHandle callee_method;

   JRT_BLOCK

     callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL);

     thread->set_vm_result(callee_method());

   JRT_BLOCK_END

   // return compiled code entry point after potential safepoints

   assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");

   return callee_method->verified_code_entry();

 JRT_END

 // Resolve a virtual call that can be statically bound (e.g., always

 // monomorphic, so it has no inline cache).  Patch code to resolved target.

 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))

   methodHandle callee_method;

   JRT_BLOCK

     callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL);

     thread->set_vm_result(callee_method());

   JRT_BLOCK_END

   // return compiled code entry point after potential safepoints

   assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");

   return callee_method->verified_code_entry();

 JRT_END

 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) {

   ResourceMark rm(thread);

   CallInfo call_info;

   Bytecodes::Code bc;

   // receiver is NULL for static calls. An exception is thrown for NULL

   // receivers for non-static calls

   Handle receiver = find_callee_info(thread, bc, call_info,

                                      CHECK_(methodHandle()));

   // Compiler1 can produce virtual call sites that can actually be statically bound

   // If we fell thru to below we would think that the site was going megamorphic

   // when in fact the site can never miss. Worse because we'd think it was megamorphic

   // we'd try and do a vtable dispatch however methods that can be statically bound

   // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a

   // reresolution of the  call site (as if we did a handle_wrong_method and not an

   // plain ic_miss) and the site will be converted to an optimized virtual call site

   // never to miss again. I don't believe C2 will produce code like this but if it

   // did this would still be the correct thing to do for it too, hence no ifdef.

   //

   if (call_info.resolved_method()->can_be_statically_bound()) {

     methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle()));

     if (TraceCallFixup) {

       RegisterMap reg_map(thread, false);

       frame caller_frame = thread->last_frame().sender(&reg_map);

       ResourceMark rm(thread);

       tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));

       callee_method->print_short_name(tty);

       tty->print_cr(" from pc: " INTPTR_FORMAT, caller_frame.pc());

       tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());

     }

     return callee_method;

   }

   methodHandle callee_method = call_info.selected_method();

   bool should_be_mono = false;

 #ifndef PRODUCT

   Atomic::inc(&_ic_miss_ctr);

   // Statistics & Tracing

   if (TraceCallFixup) {

     ResourceMark rm(thread);

     tty->print("IC miss (%s) call to", Bytecodes::name(bc));

     callee_method->print_short_name(tty);

     tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());

   }

   if (ICMissHistogram) {

     MutexLocker m(VMStatistic_lock);

     RegisterMap reg_map(thread, false);

     frame f = thread->last_frame().real_sender(&reg_map);// skip runtime stub

     // produce statistics under the lock

     trace_ic_miss(f.pc());

   }

 #endif

   // install an event collector so that when a vtable stub is created the

   // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The

   // event can't be posted when the stub is created as locks are held

   // - instead the event will be deferred until the event collector goes

   // out of scope.

   JvmtiDynamicCodeEventCollector event_collector;

   // Update inline cache to megamorphic. Skip update if caller has been

   // made non-entrant or we are called from interpreted.

   { MutexLocker ml_patch (CompiledIC_lock);

     RegisterMap reg_map(thread, false);

     frame caller_frame = thread->last_frame().sender(&reg_map);

     CodeBlob* cb = caller_frame.cb();

     if (cb->is_nmethod() && ((nmethod*)cb)->is_in_use()) {

       // Not a non-entrant nmethod, so find inline_cache

       CompiledIC* inline_cache = CompiledIC_before(caller_frame.pc());

       bool should_be_mono = false;

       if (inline_cache->is_optimized()) {

         if (TraceCallFixup) {

           ResourceMark rm(thread);

           tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));

           callee_method->print_short_name(tty);

           tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());

         }

         should_be_mono = true;

       } else {

         compiledICHolderOop ic_oop = (compiledICHolderOop) inline_cache->cached_oop();

         if ( ic_oop != NULL && ic_oop->is_compiledICHolder()) {

           if (receiver()->klass() == ic_oop->holder_klass()) {

             // This isn't a real miss. We must have seen that compiled code

             // is now available and we want the call site converted to a

             // monomorphic compiled call site.

             // We can't assert for callee_method->code() != NULL because it

             // could have been deoptimized in the meantime

             if (TraceCallFixup) {

               ResourceMark rm(thread);

               tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));

               callee_method->print_short_name(tty);

               tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());

             }

             should_be_mono = true;

           }

         }

       }

       if (should_be_mono) {

         // We have a path that was monomorphic but was going interpreted

         // and now we have (or had) a compiled entry. We correct the IC

         // by using a new icBuffer.

         CompiledICInfo info;

         KlassHandle receiver_klass(THREAD, receiver()->klass());

         inline_cache->compute_monomorphic_entry(callee_method,

                                                 receiver_klass,

                                                 inline_cache->is_optimized(),

                                                 false,

                                                 info, CHECK_(methodHandle()));

         inline_cache->set_to_monomorphic(info);

       } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {

         // Change to megamorphic

         inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle()));

       } else {

         // Either clean or megamorphic

       }

     }

   } // Release CompiledIC_lock

   return callee_method;

 }

 //

 // Resets a call-site in compiled code so it will get resolved again.

 // This routines handles both virtual call sites, optimized virtual call

 // sites, and static call sites. Typically used to change a call sites

 // destination from compiled to interpreted.

 //

 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) {

   ResourceMark rm(thread);

   RegisterMap reg_map(thread, false);

   frame stub_frame = thread->last_frame();

   assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");

   frame caller = stub_frame.sender(&reg_map);

   // Do nothing if the frame isn't a live compiled frame.

   // nmethod could be deoptimized by the time we get here

   // so no update to the caller is needed.

   if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {

     address pc = caller.pc();

     Events::log("update call-site at pc " INTPTR_FORMAT, pc);

     // Default call_addr is the location of the "basic" call.

     // Determine the address of the call we a reresolving. With

     // Inline Caches we will always find a recognizable call.

     // With Inline Caches disabled we may or may not find a

     // recognizable call. We will always find a call for static

     // calls and for optimized virtual calls. For vanilla virtual

     // calls it depends on the state of the UseInlineCaches switch.

     //

     // With Inline Caches disabled we can get here for a virtual call

     // for two reasons:

     //   1 - calling an abstract method. The vtable for abstract methods

     //       will run us thru handle_wrong_method and we will eventually

     //       end up in the interpreter to throw the ame.

     //   2 - a racing deoptimization. We could be doing a vanilla vtable

     //       call and between the time we fetch the entry address and

     //       we jump to it the target gets deoptimized. Similar to 1

     //       we will wind up in the interprter (thru a c2i with c2).

     //

     address call_addr = NULL;

     {

       // Get call instruction under lock because another thread may be

       // busy patching it.

       MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);

       // Location of call instruction

       if (NativeCall::is_call_before(pc)) {

         NativeCall *ncall = nativeCall_before(pc);

         call_addr = ncall->instruction_address();

       }

     }

     // Check for static or virtual call

     bool is_static_call = false;

     nmethod* caller_nm = CodeCache::find_nmethod(pc);

     // Make sure nmethod doesn't get deoptimized and removed until

     // this is done with it.

     // CLEANUP - with lazy deopt shouldn't need this lock

     nmethodLocker nmlock(caller_nm);

     if (call_addr != NULL) {

       RelocIterator iter(caller_nm, call_addr, call_addr+1);

       int ret = iter.next(); // Get item

       if (ret) {

         assert(iter.addr() == call_addr, "must find call");

         if (iter.type() == relocInfo::static_call_type) {

           is_static_call = true;

         } else {

           assert(iter.type() == relocInfo::virtual_call_type ||

                  iter.type() == relocInfo::opt_virtual_call_type

                 , "unexpected relocInfo. type");

         }

       } else {

         assert(!UseInlineCaches, "relocation info. must exist for this address");

       }

       // Cleaning the inline cache will force a new resolve. This is more robust

       // than directly setting it to the new destination, since resolving of calls

       // is always done through the same code path. (experience shows that it

       // leads to very hard to track down bugs, if an inline cache gets updated

       // to a wrong method). It should not be performance critical, since the

       // resolve is only done once.

       MutexLocker ml(CompiledIC_lock);

       //

       // We do not patch the call site if the nmethod has been made non-entrant

       // as it is a waste of time

       //

       if (caller_nm->is_in_use()) {

         if (is_static_call) {

           CompiledStaticCall* ssc= compiledStaticCall_at(call_addr);

           ssc->set_to_clean();

         } else {

           // compiled, dispatched call (which used to call an interpreted method)

           CompiledIC* inline_cache = CompiledIC_at(call_addr);

           inline_cache->set_to_clean();

         }

       }

     }

   }

   methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));

 #ifndef PRODUCT

   Atomic::inc(&_wrong_method_ctr);

   if (TraceCallFixup) {

     ResourceMark rm(thread);

     tty->print("handle_wrong_method reresolving call to");

     callee_method->print_short_name(tty);

     tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());

   }

 #endif

   return callee_method;

 }

 // ---------------------------------------------------------------------------

 // We are calling the interpreter via a c2i. Normally this would mean that

 // we were called by a compiled method. However we could have lost a race

 // where we went int -> i2c -> c2i and so the caller could in fact be

 // interpreted. If the caller is compiled we attampt to patch the caller

 // so he no longer calls into the interpreter.

 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(methodOopDesc* method, address caller_pc))

   methodOop moop(method);

   address entry_point = moop->from_compiled_entry();

   // It's possible that deoptimization can occur at a call site which hasn't

   // been resolved yet, in which case this function will be called from

   // an nmethod that has been patched for deopt and we can ignore the

   // request for a fixup.

   // Also it is possible that we lost a race in that from_compiled_entry

   // is now back to the i2c in that case we don't need to patch and if

   // we did we'd leap into space because the callsite needs to use

   // "to interpreter" stub in order to load up the methodOop. Don't

   // ask me how I know this...

   //

   CodeBlob* cb = CodeCache::find_blob(caller_pc);

   if ( !cb->is_nmethod() || entry_point == moop->get_c2i_entry()) {

     return;

   }

   // There is a benign race here. We could be attempting to patch to a compiled

   // entry point at the same time the callee is being deoptimized. If that is

   // the case then entry_point may in fact point to a c2i and we'd patch the

   // call site with the same old data. clear_code will set code() to NULL

   // at the end of it. If we happen to see that NULL then we can skip trying

   // to patch. If we hit the window where the callee has a c2i in the

   // from_compiled_entry and the NULL isn't present yet then we lose the race

   // and patch the code with the same old data. Asi es la vida.

   if (moop->code() == NULL) return;

   if (((nmethod*)cb)->is_in_use()) {

     // Expect to find a native call there (unless it was no-inline cache vtable dispatch)

     MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);

     if (NativeCall::is_call_before(caller_pc + frame::pc_return_offset)) {

       NativeCall *call = nativeCall_before(caller_pc + frame::pc_return_offset);

       //

       // bug 6281185. We might get here after resolving a call site to a vanilla

       // virtual call. Because the resolvee uses the verified entry it may then

       // see compiled code and attempt to patch the site by calling us. This would

       // then incorrectly convert the call site to optimized and its downhill from

       // there. If you're lucky you'll get the assert in the bugid, if not you've

       // just made a call site that could be megamorphic into a monomorphic site

       // for the rest of its life! Just another racing bug in the life of

       // fixup_callers_callsite ...

       //

       RelocIterator iter(cb, call->instruction_address(), call->next_instruction_address());

       iter.next();

       assert(iter.has_current(), "must have a reloc at java call site");

       relocInfo::relocType typ = iter.reloc()->type();

       if ( typ != relocInfo::static_call_type &&

            typ != relocInfo::opt_virtual_call_type &&

            typ != relocInfo::static_stub_type) {

         return;

       }

       address destination = call->destination();

       if (destination != entry_point) {

         CodeBlob* callee = CodeCache::find_blob(destination);

         // callee == cb seems weird. It means calling interpreter thru stub.

         if (callee == cb || callee->is_adapter_blob()) {

           // static call or optimized virtual

           if (TraceCallFixup) {

             tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);

             moop->print_short_name(tty);

             tty->print_cr(" to " INTPTR_FORMAT, entry_point);

           }

           call->set_destination_mt_safe(entry_point);

         } else {

           if (TraceCallFixup) {

             tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);

             moop->print_short_name(tty);

             tty->print_cr(" to " INTPTR_FORMAT, entry_point);

           }

           // assert is too strong could also be resolve destinations.

           // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");

         }

       } else {

           if (TraceCallFixup) {

             tty->print("already patched  callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);

             moop->print_short_name(tty);

             tty->print_cr(" to " INTPTR_FORMAT, entry_point);

           }

       }

     }

   }

 IRT_END

 // same as JVM_Arraycopy, but called directly from compiled code

 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src,  jint src_pos,

                                                 oopDesc* dest, jint dest_pos,

                                                 jint length,

                                                 JavaThread* thread)) {

 #ifndef PRODUCT

   _slow_array_copy_ctr++;

 #endif

   // Check if we have null pointers

   if (src == NULL || dest == NULL) {

     THROW(vmSymbols::java_lang_NullPointerException());

   }

   // Do the copy.  The casts to arrayOop are necessary to the copy_array API,

   // even though the copy_array API also performs dynamic checks to ensure

   // that src and dest are truly arrays (and are conformable).

   // The copy_array mechanism is awkward and could be removed, but

   // the compilers don't call this function except as a last resort,

   // so it probably doesn't matter.

   Klass::cast(src->klass())->copy_array((arrayOopDesc*)src,  src_pos,

                                         (arrayOopDesc*)dest, dest_pos,

                                         length, thread);

 }

 JRT_END

 char* SharedRuntime::generate_class_cast_message(

     JavaThread* thread, const char* objName) {

   // Get target class name from the checkcast instruction

   vframeStream vfst(thread, true);

   assert(!vfst.at_end(), "Java frame must exist");

   Bytecode_checkcast* cc = Bytecode_checkcast_at(

     vfst.method()->bcp_from(vfst.bci()));

   Klass* targetKlass = Klass::cast(vfst.method()->constants()->klass_at(

     cc->index(), thread));

   return generate_class_cast_message(objName, targetKlass->external_name());

 }

 char* SharedRuntime::generate_class_cast_message(

     const char* objName, const char* targetKlassName) {

   const char* desc = " cannot be cast to ";

   size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1;

   char* message = NEW_RESOURCE_ARRAY(char, msglen);

   if (NULL == message) {

     // Shouldn't happen, but don't cause even more problems if it does

     message = const_cast<char*>(objName);

   } else {

     jio_snprintf(message, msglen, "%s%s%s", objName, desc, targetKlassName);

   }

   return message;

 }

 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())

   (void) JavaThread::current()->reguard_stack();

 JRT_END

 // Handles the uncommon case in locking, i.e., contention or an inflated lock.

 #ifndef PRODUCT

 int SharedRuntime::_monitor_enter_ctr=0;

 #endif

 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))

   oop obj(_obj);

 #ifndef PRODUCT

   _monitor_enter_ctr++;             // monitor enter slow

 #endif

   if (PrintBiasedLockingStatistics) {

     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());

   }

   Handle h_obj(THREAD, obj);

   if (UseBiasedLocking) {

     // Retry fast entry if bias is revoked to avoid unnecessary inflation

     ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);

   } else {

     ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);

   }

   assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");

 JRT_END

 #ifndef PRODUCT

 int SharedRuntime::_monitor_exit_ctr=0;

 #endif

 // Handles the uncommon cases of monitor unlocking in compiled code

 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock))

    oop obj(_obj);

 #ifndef PRODUCT

   _monitor_exit_ctr++;              // monitor exit slow

 #endif

   Thread* THREAD = JavaThread::current();

   // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore

   // testing was unable to ever fire the assert that guarded it so I have removed it.

   assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");

 #undef MIGHT_HAVE_PENDING

 #ifdef MIGHT_HAVE_PENDING

   // Save and restore any pending_exception around the exception mark.

   // While the slow_exit must not throw an exception, we could come into

   // this routine with one set.

   oop pending_excep = NULL;

   const char* pending_file;

   int pending_line;

   if (HAS_PENDING_EXCEPTION) {

     pending_excep = PENDING_EXCEPTION;

     pending_file  = THREAD->exception_file();

     pending_line  = THREAD->exception_line();

     CLEAR_PENDING_EXCEPTION;

   }

 #endif /* MIGHT_HAVE_PENDING */

   {

     // Exit must be non-blocking, and therefore no exceptions can be thrown.

     EXCEPTION_MARK;

     ObjectSynchronizer::slow_exit(obj, lock, THREAD);

   }

 #ifdef MIGHT_HAVE_PENDING

   if (pending_excep != NULL) {

     THREAD->set_pending_exception(pending_excep, pending_file, pending_line);

   }

 #endif /* MIGHT_HAVE_PENDING */

 JRT_END

 #ifndef PRODUCT

 void SharedRuntime::print_statistics() {

   ttyLocker ttyl;

   if (xtty != NULL)  xtty->head("statistics type='SharedRuntime'");

   if (_monitor_enter_ctr ) tty->print_cr("%5d monitor enter slow",  _monitor_enter_ctr);

   if (_monitor_exit_ctr  ) tty->print_cr("%5d monitor exit slow",   _monitor_exit_ctr);

   if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);

   SharedRuntime::print_ic_miss_histogram();

   if (CountRemovableExceptions) {

     if (_nof_removable_exceptions > 0) {

       Unimplemented(); // this counter is not yet incremented

       tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);

     }

   }

   // Dump the JRT_ENTRY counters

   if( _new_instance_ctr ) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);

   if( _new_array_ctr ) tty->print_cr("%5d new array requires GC", _new_array_ctr);

   if( _multi1_ctr ) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);

   if( _multi2_ctr ) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);

   if( _multi3_ctr ) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);

   if( _multi4_ctr ) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);

   if( _multi5_ctr ) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);

   tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr );

   tty->print_cr("%5d wrong method", _wrong_method_ctr );

   tty->print_cr("%5d unresolved static call site", _resolve_static_ctr );

   tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr );

   tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr );

   if( _mon_enter_stub_ctr ) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr );

   if( _mon_exit_stub_ctr ) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr );

   if( _mon_enter_ctr ) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr );

   if( _mon_exit_ctr ) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr );

   if( _partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr );

   if( _jbyte_array_copy_ctr ) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr );

   if( _jshort_array_copy_ctr ) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr );

   if( _jint_array_copy_ctr ) tty->print_cr("%5d int array copies", _jint_array_copy_ctr );

   if( _jlong_array_copy_ctr ) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr );

   if( _oop_array_copy_ctr ) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr );

   if( _checkcast_array_copy_ctr ) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr );

   if( _unsafe_array_copy_ctr ) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr );

   if( _generic_array_copy_ctr ) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr );

   if( _slow_array_copy_ctr ) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr );

   if( _find_handler_ctr ) tty->print_cr("%5d find exception handler", _find_handler_ctr );

   if( _rethrow_ctr ) tty->print_cr("%5d rethrow handler", _rethrow_ctr );

   if (xtty != NULL)  xtty->tail("statistics");

 }

 inline double percent(int x, int y) {

   return 100.0 * x / MAX2(y, 1);

 }

 class MethodArityHistogram {

  public:

   enum { MAX_ARITY = 256 };

  private:

   static int _arity_histogram[MAX_ARITY];     // histogram of #args

   static int _size_histogram[MAX_ARITY];      // histogram of arg size in words

   static int _max_arity;                      // max. arity seen

   static int _max_size;                       // max. arg size seen

   static void add_method_to_histogram(nmethod* nm) {

     methodOop m = nm->method();

     ArgumentCount args(m->signature());

     int arity   = args.size() + (m->is_static() ? 0 : 1);

     int argsize = m->size_of_parameters();

     arity   = MIN2(arity, MAX_ARITY-1);

     argsize = MIN2(argsize, MAX_ARITY-1);

     int count = nm->method()->compiled_invocation_count();

     _arity_histogram[arity]  += count;

     _size_histogram[argsize] += count;

     _max_arity = MAX2(_max_arity, arity);

     _max_size  = MAX2(_max_size, argsize);

   }

   void print_histogram_helper(int n, int* histo, const char* name) {

     const int N = MIN2(5, n);

     tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");

     double sum = 0;

     double weighted_sum = 0;

     int i;

     for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }

     double rest = sum;

     double percent = sum / 100;

     for (i = 0; i <= N; i++) {

       rest -= histo[i];

       tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);

     }

     tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);

     tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);

   }

   void print_histogram() {

     tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");

     print_histogram_helper(_max_arity, _arity_histogram, "arity");

     tty->print_cr("\nSame for parameter size (in words):");

     print_histogram_helper(_max_size, _size_histogram, "size");

     tty->cr();

   }

  public:

   MethodArityHistogram() {

     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

     _max_arity = _max_size = 0;

     for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram [i] = 0;

     CodeCache::nmethods_do(add_method_to_histogram);

     print_histogram();

   }

 };

 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];

 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];

 int MethodArityHistogram::_max_arity;

 int MethodArityHistogram::_max_size;

 void SharedRuntime::print_call_statistics(int comp_total) {

   tty->print_cr("Calls from compiled code:");

   int total  = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;

   int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;

   int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;

   tty->print_cr("\t%9d   (%4.1f%%) total non-inlined   ", total, percent(total, total));

   tty->print_cr("\t%9d   (%4.1f%%) virtual calls       ", _nof_normal_calls, percent(_nof_normal_calls, total));

   tty->print_cr("\t  %9d  (%3.0f%%)   inlined          ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));

   tty->print_cr("\t  %9d  (%3.0f%%)   optimized        ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));

   tty->print_cr("\t  %9d  (%3.0f%%)   monomorphic      ", mono_c, percent(mono_c, _nof_normal_calls));

   tty->print_cr("\t  %9d  (%3.0f%%)   megamorphic      ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));

   tty->print_cr("\t%9d   (%4.1f%%) interface calls     ", _nof_interface_calls, percent(_nof_interface_calls, total));

   tty->print_cr("\t  %9d  (%3.0f%%)   inlined          ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));

   tty->print_cr("\t  %9d  (%3.0f%%)   optimized        ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));

   tty->print_cr("\t  %9d  (%3.0f%%)   monomorphic      ", mono_i, percent(mono_i, _nof_interface_calls));

   tty->print_cr("\t  %9d  (%3.0f%%)   megamorphic      ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));

   tty->print_cr("\t%9d   (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));

   tty->print_cr("\t  %9d  (%3.0f%%)   inlined          ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));

   tty->cr();

   tty->print_cr("Note 1: counter updates are not MT-safe.");

   tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");

   tty->print_cr("        %% in nested categories are relative to their category");

   tty->print_cr("        (and thus add up to more than 100%% with inlining)");

   tty->cr();

   MethodArityHistogram h;

 }

 #endif

 // ---------------------------------------------------------------------------

 // Implementation of AdapterHandlerLibrary

 const char* AdapterHandlerEntry::name = "I2C/C2I adapters";

 GrowableArray<uint64_t>* AdapterHandlerLibrary::_fingerprints = NULL;

 GrowableArray<AdapterHandlerEntry* >* AdapterHandlerLibrary::_handlers = NULL;

 const int AdapterHandlerLibrary_size = 16*K;

 u_char                   AdapterHandlerLibrary::_buffer[AdapterHandlerLibrary_size + 32];

 void AdapterHandlerLibrary::initialize() {

   if (_fingerprints != NULL) return;

   _fingerprints = new(ResourceObj::C_HEAP)GrowableArray<uint64_t>(32, true);

   _handlers = new(ResourceObj::C_HEAP)GrowableArray<AdapterHandlerEntry*>(32, true);

   // Index 0 reserved for the slow path handler

   _fingerprints->append(0/*the never-allowed 0 fingerprint*/);

   _handlers->append(NULL);

   // Create a special handler for abstract methods.  Abstract methods

   // are never compiled so an i2c entry is somewhat meaningless, but

   // fill it in with something appropriate just in case.  Pass handle

   // wrong method for the c2i transitions.

   address wrong_method = SharedRuntime::get_handle_wrong_method_stub();

   _fingerprints->append(0/*the never-allowed 0 fingerprint*/);

   assert(_handlers->length() == AbstractMethodHandler, "in wrong slot");

   _handlers->append(new AdapterHandlerEntry(StubRoutines::throw_AbstractMethodError_entry(),

                                             wrong_method, wrong_method));

 }

 int AdapterHandlerLibrary::get_create_adapter_index(methodHandle method) {

   // Use customized signature handler.  Need to lock around updates to the

   // _fingerprints array (it is not safe for concurrent readers and a single

   // writer: this can be fixed if it becomes a problem).

   // Get the address of the ic_miss handlers before we grab the

   // AdapterHandlerLibrary_lock. This fixes bug 6236259 which

   // was caused by the initialization of the stubs happening

   // while we held the lock and then notifying jvmti while

   // holding it. This just forces the initialization to be a little

   // earlier.

   address ic_miss = SharedRuntime::get_ic_miss_stub();

   assert(ic_miss != NULL, "must have handler");

   int result;

   BufferBlob *B = NULL;

   uint64_t fingerprint;

   {

     MutexLocker mu(AdapterHandlerLibrary_lock);

     // make sure data structure is initialized

     initialize();

     if (method->is_abstract()) {

       return AbstractMethodHandler;

     }

     // Lookup method signature's fingerprint

     fingerprint = Fingerprinter(method).fingerprint();

     assert( fingerprint != CONST64( 0), "no zero fingerprints allowed" );

     // Fingerprints are small fixed-size condensed representations of

     // signatures.  If the signature is too large, it won't fit in a

     // fingerprint.  Signatures which cannot support a fingerprint get a new i2c

     // adapter gen'd each time, instead of searching the cache for one.  This -1

     // game can be avoided if I compared signatures instead of using

     // fingerprints.  However, -1 fingerprints are very rare.

     if( fingerprint != UCONST64(-1) ) { // If this is a cache-able fingerprint

       // Turns out i2c adapters do not care what the return value is.  Mask it

       // out so signatures that only differ in return type will share the same

       // adapter.

       fingerprint &= ~(SignatureIterator::result_feature_mask << SignatureIterator::static_feature_size);

       // Search for a prior existing i2c/c2i adapter

       int index = _fingerprints->find(fingerprint);

       if( index >= 0 ) return index; // Found existing handlers?

     } else {

       // Annoyingly, I end up adding -1 fingerprints to the array of handlers,

       // because I need a unique handler index.  It cannot be scanned for

       // because all -1's look alike.  Instead, the matching index is passed out

       // and immediately used to collect the 2 return values (the c2i and i2c

       // adapters).

     }

     // Create I2C & C2I handlers

     ResourceMark rm;

     // Improve alignment slightly

     u_char *buf = (u_char*)(((intptr_t)_buffer + CodeEntryAlignment-1) & ~(CodeEntryAlignment-1));

     CodeBuffer buffer(buf, AdapterHandlerLibrary_size);

     short buffer_locs[20];

     buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,

                                            sizeof(buffer_locs)/sizeof(relocInfo));

     MacroAssembler _masm(&buffer);

     // Fill in the signature array, for the calling-convention call.

     int total_args_passed = method->size_of_parameters(); // All args on stack

     BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType,total_args_passed);

     VMRegPair  * regs   = NEW_RESOURCE_ARRAY(VMRegPair  ,total_args_passed);

     int i=0;

     if( !method->is_static() )  // Pass in receiver first

       sig_bt[i++] = T_OBJECT;

     for( SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {

       sig_bt[i++] = ss.type();  // Collect remaining bits of signature

       if( ss.type() == T_LONG || ss.type() == T_DOUBLE )

         sig_bt[i++] = T_VOID;   // Longs & doubles take 2 Java slots

     }

     assert( i==total_args_passed, "" );

     // Now get the re-packed compiled-Java layout.

     int comp_args_on_stack;

     // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage

     comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);

     AdapterHandlerEntry* entry = SharedRuntime::generate_i2c2i_adapters(&_masm,

                                                                         total_args_passed,

                                                                         comp_args_on_stack,

                                                                         sig_bt,

                                                                         regs);

     B = BufferBlob::create(AdapterHandlerEntry::name, &buffer);

     if (B == NULL) {

       // CodeCache is full, disable compilation

       // Ought to log this but compile log is only per compile thread

       // and we're some non descript Java thread.

       UseInterpreter = true;

       if (UseCompiler || AlwaysCompileLoopMethods ) {

 #ifndef PRODUCT

         warning("CodeCache is full. Compiler has been disabled");

         if (CompileTheWorld || ExitOnFullCodeCache) {

           before_exit(JavaThread::current());

           exit_globals(); // will delete tty

           vm_direct_exit(CompileTheWorld ? 0 : 1);

         }

 #endif

         UseCompiler               = false;

         AlwaysCompileLoopMethods  = false;

       }

       return 0; // Out of CodeCache space (_handlers[0] == NULL)

     }

     entry->relocate(B->instructions_begin());

 #ifndef PRODUCT

     // debugging suppport

     if (PrintAdapterHandlers) {

       tty->cr();

       tty->print_cr("i2c argument handler #%d for: %s %s (fingerprint = 0x%llx, %d bytes generated)",

                     _handlers->length(), (method->is_static() ? "static" : "receiver"),

                     method->signature()->as_C_string(), fingerprint, buffer.code_size() );

       tty->print_cr("c2i argument handler starts at %p",entry->get_c2i_entry());

       Disassembler::decode(entry->get_i2c_entry(), entry->get_i2c_entry() + buffer.code_size());

     }

 #endif

     // add handlers to library

     _fingerprints->append(fingerprint);

     _handlers->append(entry);

     // set handler index

     assert(_fingerprints->length() == _handlers->length(), "sanity check");

     result = _fingerprints->length() - 1;

   }

   // Outside of the lock

   if (B != NULL) {

     char blob_id[256];

     jio_snprintf(blob_id,

                  sizeof(blob_id),

                  "%s(" PTR64_FORMAT ")@" PTR_FORMAT,

                  AdapterHandlerEntry::name,

                  fingerprint,

                  B->instructions_begin());

     VTune::register_stub(blob_id, B->instructions_begin(), B->instructions_end());

     Forte::register_stub(blob_id, B->instructions_begin(), B->instructions_end());

     if (JvmtiExport::should_post_dynamic_code_generated()) {

       JvmtiExport::post_dynamic_code_generated(blob_id,

                                                B->instructions_begin(),

                                                B->instructions_end());

     }

   }

   return result;

 }

 void AdapterHandlerEntry::relocate(address new_base) {

     ptrdiff_t delta = new_base - _i2c_entry;

     _i2c_entry += delta;

     _c2i_entry += delta;

     _c2i_unverified_entry += delta;

 }

 // Create a native wrapper for this native method.  The wrapper converts the

 // java compiled calling convention to the native convention, handlizes

 // arguments, and transitions to native.  On return from the native we transition

 // back to java blocking if a safepoint is in progress.

 nmethod *AdapterHandlerLibrary::create_native_wrapper(methodHandle method) {

   ResourceMark rm;

   nmethod* nm = NULL;

   if (PrintCompilation) {

     ttyLocker ttyl;

     tty->print("---   n%s ", (method->is_synchronized() ? "s" : " "));

     method->print_short_name(tty);

     if (method->is_static()) {

       tty->print(" (static)");

     }

     tty->cr();

   }

   assert(method->has_native_function(), "must have something valid to call!");

   {

     // perform the work while holding the lock, but perform any printing outside the lock

     MutexLocker mu(AdapterHandlerLibrary_lock);

     // See if somebody beat us to it

     nm = method->code();

     if (nm) {

       return nm;

     }

     // Improve alignment slightly

     u_char* buf = (u_char*)(((intptr_t)_buffer + CodeEntryAlignment-1) & ~(CodeEntryAlignment-1));

     CodeBuffer buffer(buf, AdapterHandlerLibrary_size);

     // Need a few relocation entries

     double locs_buf[20];

     buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));

     MacroAssembler _masm(&buffer);

     // Fill in the signature array, for the calling-convention call.

     int total_args_passed = method->size_of_parameters();

     BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType,total_args_passed);

     VMRegPair  * regs   = NEW_RESOURCE_ARRAY(VMRegPair  ,total_args_passed);

     int i=0;

     if( !method->is_static() )  // Pass in receiver first

       sig_bt[i++] = T_OBJECT;

     SignatureStream ss(method->signature());

     for( ; !ss.at_return_type(); ss.next()) {

       sig_bt[i++] = ss.type();  // Collect remaining bits of signature

       if( ss.type() == T_LONG || ss.type() == T_DOUBLE )

         sig_bt[i++] = T_VOID;   // Longs & doubles take 2 Java slots

     }

     assert( i==total_args_passed, "" );

     BasicType ret_type = ss.type();

     // Now get the compiled-Java layout as input arguments

     int comp_args_on_stack;

     comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);

     // Generate the compiled-to-native wrapper code

     nm = SharedRuntime::generate_native_wrapper(&_masm,

                                                 method,

                                                 total_args_passed,

                                                 comp_args_on_stack,

                                                 sig_bt,regs,

                                                 ret_type);

   }

   // Must unlock before calling set_code

   // Install the generated code.

   if (nm != NULL) {

     method->set_code(method, nm);

     nm->post_compiled_method_load_event();

   } else {

     // CodeCache is full, disable compilation

     // Ought to log this but compile log is only per compile thread

     // and we're some non descript Java thread.

     UseInterpreter = true;

     if (UseCompiler || AlwaysCompileLoopMethods ) {

 #ifndef PRODUCT

       warning("CodeCache is full. Compiler has been disabled");

       if (CompileTheWorld || ExitOnFullCodeCache) {

         before_exit(JavaThread::current());

         exit_globals(); // will delete tty

         vm_direct_exit(CompileTheWorld ? 0 : 1);

       }

 #endif

       UseCompiler               = false;

       AlwaysCompileLoopMethods  = false;

     }

   }

   return nm;

 }

 #ifdef HAVE_DTRACE_H

 // Create a dtrace nmethod for this method.  The wrapper converts the

 // java compiled calling convention to the native convention, makes a dummy call

 // (actually nops for the size of the call instruction, which become a trap if

 // probe is enabled). The returns to the caller. Since this all looks like a

 // leaf no thread transition is needed.

 nmethod *AdapterHandlerLibrary::create_dtrace_nmethod(methodHandle method) {

   ResourceMark rm;

   nmethod* nm = NULL;

   if (PrintCompilation) {

     ttyLocker ttyl;

     tty->print("---   n%s  ");

     method->print_short_name(tty);

     if (method->is_static()) {

       tty->print(" (static)");

     }

     tty->cr();

   }

   {

     // perform the work while holding the lock, but perform any printing

     // outside the lock

     MutexLocker mu(AdapterHandlerLibrary_lock);

     // See if somebody beat us to it

     nm = method->code();

     if (nm) {

       return nm;

     }

     // Improve alignment slightly

     u_char* buf = (u_char*)

         (((intptr_t)_buffer + CodeEntryAlignment-1) & ~(CodeEntryAlignment-1));

     CodeBuffer buffer(buf, AdapterHandlerLibrary_size);

     // Need a few relocation entries

     double locs_buf[20];

     buffer.insts()->initialize_shared_locs(

         (relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));

     MacroAssembler _masm(&buffer);

     // Generate the compiled-to-native wrapper code

     nm = SharedRuntime::generate_dtrace_nmethod(&_masm, method);

   }

   return nm;

 }

 // the dtrace method needs to convert java lang string to utf8 string.

 void SharedRuntime::get_utf(oopDesc* src, address dst) {

   typeArrayOop jlsValue  = java_lang_String::value(src);

   int          jlsOffset = java_lang_String::offset(src);

   int          jlsLen    = java_lang_String::length(src);

   jchar*       jlsPos    = (jlsLen == 0) ? NULL :

                                            jlsValue->char_at_addr(jlsOffset);

   (void) UNICODE::as_utf8(jlsPos, jlsLen, (char *)dst, max_dtrace_string_size);

 }

 #endif // ndef HAVE_DTRACE_H

 // -------------------------------------------------------------------------

 // Java-Java calling convention

 // (what you use when Java calls Java)

 //------------------------------name_for_receiver----------------------------------

 // For a given signature, return the VMReg for parameter 0.

 VMReg SharedRuntime::name_for_receiver() {

   VMRegPair regs;

   BasicType sig_bt = T_OBJECT;

   (void) java_calling_convention(&sig_bt, &regs, 1, true);

   // Return argument 0 register.  In the LP64 build pointers

   // take 2 registers, but the VM wants only the 'main' name.

   return regs.first();

 }

 VMRegPair *SharedRuntime::find_callee_arguments(symbolOop sig, bool is_static, int* arg_size) {

   // This method is returning a data structure allocating as a

   // ResourceObject, so do not put any ResourceMarks in here.

   char *s = sig->as_C_string();

   int len = (int)strlen(s);

   *s++; len--;                  // Skip opening paren

   char *t = s+len;

   while( *(--t) != ')' ) ;      // Find close paren

   BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, 256 );

   VMRegPair *regs = NEW_RESOURCE_ARRAY( VMRegPair, 256 );

   int cnt = 0;

   if (!is_static) {

     sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature

   }

   while( s < t ) {

     switch( *s++ ) {            // Switch on signature character

     case 'B': sig_bt[cnt++] = T_BYTE;    break;

     case 'C': sig_bt[cnt++] = T_CHAR;    break;

     case 'D': sig_bt[cnt++] = T_DOUBLE;  sig_bt[cnt++] = T_VOID; break;

     case 'F': sig_bt[cnt++] = T_FLOAT;   break;

     case 'I': sig_bt[cnt++] = T_INT;     break;

     case 'J': sig_bt[cnt++] = T_LONG;    sig_bt[cnt++] = T_VOID; break;

     case 'S': sig_bt[cnt++] = T_SHORT;   break;

     case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;

     case 'V': sig_bt[cnt++] = T_VOID;    break;

     case 'L':                   // Oop

       while( *s++ != ';'  ) ;   // Skip signature

       sig_bt[cnt++] = T_OBJECT;

       break;

     case '[': {                 // Array

       do {                      // Skip optional size

         while( *s >= '0' && *s <= '9' ) s++;

       } while( *s++ == '[' );   // Nested arrays?

       // Skip element type

       if( s[-1] == 'L' )

         while( *s++ != ';'  ) ; // Skip signature

       sig_bt[cnt++] = T_ARRAY;

       break;

     }

     default : ShouldNotReachHere();

     }

   }

   assert( cnt < 256, "grow table size" );

   int comp_args_on_stack;

   comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);

   // the calling convention doesn't count out_preserve_stack_slots so

   // we must add that in to get "true" stack offsets.

   if (comp_args_on_stack) {

     for (int i = 0; i < cnt; i++) {

       VMReg reg1 = regs[i].first();

       if( reg1->is_stack()) {

         // Yuck

         reg1 = reg1->bias(out_preserve_stack_slots());

       }

       VMReg reg2 = regs[i].second();

       if( reg2->is_stack()) {

         // Yuck

         reg2 = reg2->bias(out_preserve_stack_slots());

       }

       regs[i].set_pair(reg2, reg1);

     }

   }

   // results

   *arg_size = cnt;

   return regs;

 }

 // OSR Migration Code

 //

 // This code is used convert interpreter frames into compiled frames.  It is

 // called from very start of a compiled OSR nmethod.  A temp array is

 // allocated to hold the interesting bits of the interpreter frame.  All

 // active locks are inflated to allow them to move.  The displaced headers and

 // active interpeter locals are copied into the temp buffer.  Then we return

 // back to the compiled code.  The compiled code then pops the current

 // interpreter frame off the stack and pushes a new compiled frame.  Then it

 // copies the interpreter locals and displaced headers where it wants.

 // Finally it calls back to free the temp buffer.

 //

 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.

 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )

 #ifdef IA64

   ShouldNotReachHere(); // NYI

 #endif /* IA64 */

   //

   // This code is dependent on the memory layout of the interpreter local

   // array and the monitors. On all of our platforms the layout is identical

   // so this code is shared. If some platform lays the their arrays out

   // differently then this code could move to platform specific code or

   // the code here could be modified to copy items one at a time using

   // frame accessor methods and be platform independent.

   frame fr = thread->last_frame();

   assert( fr.is_interpreted_frame(), "" );

   assert( fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks" );

   // Figure out how many monitors are active.

   int active_monitor_count = 0;

   for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();

        kptr < fr.interpreter_frame_monitor_begin();

        kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {

     if( kptr->obj() != NULL ) active_monitor_count++;

   }

   // QQQ we could place number of active monitors in the array so that compiled code

   // could double check it.

   methodOop moop = fr.interpreter_frame_method();

   int max_locals = moop->max_locals();

   // Allocate temp buffer, 1 word per local & 2 per active monitor

   int buf_size_words = max_locals + active_monitor_count*2;

   intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words);

   // Copy the locals.  Order is preserved so that loading of longs works.

   // Since there's no GC I can copy the oops blindly.

   assert( sizeof(HeapWord)==sizeof(intptr_t), "fix this code");

   if (TaggedStackInterpreter) {

     for (int i = 0; i < max_locals; i++) {

       // copy only each local separately to the buffer avoiding the tag

       buf[i] = *fr.interpreter_frame_local_at(max_locals-i-1);

     }

   } else {

     Copy::disjoint_words(

                        (HeapWord*)fr.interpreter_frame_local_at(max_locals-1),

                        (HeapWord*)&buf[0],

                        max_locals);

   }

   // Inflate locks.  Copy the displaced headers.  Be careful, there can be holes.

   int i = max_locals;

   for( BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();

        kptr2 < fr.interpreter_frame_monitor_begin();

        kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {

     if( kptr2->obj() != NULL) {         // Avoid 'holes' in the monitor array

       BasicLock *lock = kptr2->lock();

       // Inflate so the displaced header becomes position-independent

       if (lock->displaced_header()->is_unlocked())

         ObjectSynchronizer::inflate_helper(kptr2->obj());

       // Now the displaced header is free to move

       buf[i++] = (intptr_t)lock->displaced_header();

       buf[i++] = (intptr_t)kptr2->obj();

     }

   }

   assert( i - max_locals == active_monitor_count*2, "found the expected number of monitors" );

   return buf;

 JRT_END

 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )

   FREE_C_HEAP_ARRAY(intptr_t,buf);

 JRT_END

 #ifndef PRODUCT

 bool AdapterHandlerLibrary::contains(CodeBlob* b) {

   if (_handlers == NULL) return false;

   for (int i = 0 ; i < _handlers->length() ; i++) {

     AdapterHandlerEntry* a = get_entry(i);

     if ( a != NULL && b == CodeCache::find_blob(a->get_i2c_entry()) ) return true;

   }

   return false;

 }

 void AdapterHandlerLibrary::print_handler(CodeBlob* b) {

   for (int i = 0 ; i < _handlers->length() ; i++) {

     AdapterHandlerEntry* a = get_entry(i);

     if ( a != NULL && b == CodeCache::find_blob(a->get_i2c_entry()) ) {

       tty->print("Adapter for signature: ");

       // Fingerprinter::print(_fingerprints->at(i));

       tty->print("0x%" FORMAT64_MODIFIER "x", _fingerprints->at(i));

       tty->print_cr(" i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT,

                     a->get_i2c_entry(), a->get_c2i_entry(), a->get_c2i_unverified_entry());

       return;

     }

   }

   assert(false, "Should have found handler");

 }

 #endif /* PRODUCT */