jdk8-mips64-public/hotspot: src/share/vm/runtime/sharedRuntime.cpp@23ae54207126 (annotated)

src/share/vm/runtime/sharedRuntime.cpp@23ae54207126 (annotated)

src/share/vm/runtime/sharedRuntime.cpp

Mon, 28 Feb 2011 15:35:45 -0800

author: rottenha
date: Mon, 28 Feb 2011 15:35:45 -0800
changeset 2586: 23ae54207126
parent 2508: b92c45f2bc75
child 2603: 1b4e6a5d98e0
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "code/compiledIC.hpp"
 #include "code/scopeDesc.hpp"
 #include "code/vtableStubs.hpp"
 #include "compiler/abstractCompiler.hpp"
 #include "compiler/compileBroker.hpp"
 #include "compiler/compilerOracle.hpp"
 #include "interpreter/interpreter.hpp"
 #include "interpreter/interpreterRuntime.hpp"
 #include "memory/gcLocker.inline.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/oop.inline.hpp"
 #include "prims/forte.hpp"
 #include "prims/jvmtiExport.hpp"
 #include "prims/jvmtiRedefineClassesTrace.hpp"
 #include "prims/methodHandles.hpp"
 #include "prims/nativeLookup.hpp"
 #include "runtime/arguments.hpp"
 #include "runtime/biasedLocking.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/init.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/javaCalls.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/stubRoutines.hpp"
 #include "runtime/vframe.hpp"
 #include "runtime/vframeArray.hpp"
 #include "utilities/copy.hpp"
 #include "utilities/dtrace.hpp"
 #include "utilities/events.hpp"
 #include "utilities/hashtable.inline.hpp"
 #include "utilities/xmlstream.hpp"
 #ifdef TARGET_ARCH_x86
 # include "nativeInst_x86.hpp"
 # include "vmreg_x86.inline.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "nativeInst_sparc.hpp"
 # include "vmreg_sparc.inline.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "nativeInst_zero.hpp"
 # include "vmreg_zero.inline.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "nativeInst_arm.hpp"
 # include "vmreg_arm.inline.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "nativeInst_ppc.hpp"
 # include "vmreg_ppc.inline.hpp"
 #endif
 #ifdef COMPILER1
 #include "c1/c1_Runtime1.hpp"
 #endif
 #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;
   }
   assert(orig->is_oop(true /* ignore mark word */), "Error");
   // 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
 #ifdef __SOFTFP__
 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
   return x + y;
 JRT_END
 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
   return x - y;
 JRT_END
 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
   return x * y;
 JRT_END
 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
   return x / y;
 JRT_END
 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
   return x + y;
 JRT_END
 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
   return x - y;
 JRT_END
 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
   return x * y;
 JRT_END
 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
   return x / y;
 JRT_END
 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
   return (jfloat)x;
 JRT_END
 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
   return (jdouble)x;
 JRT_END
 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
   return (jdouble)x;
 JRT_END
 JRT_LEAF(int,  SharedRuntime::fcmpl(float x, float y))
   return x>y ? 1 : (x==y ? 0 : -1);  /* x<y or is_nan*/
 JRT_END
 JRT_LEAF(int,  SharedRuntime::fcmpg(float x, float y))
   return x<y ? -1 : (x==y ? 0 : 1);  /* x>y or is_nan */
 JRT_END
 JRT_LEAF(int,  SharedRuntime::dcmpl(double x, double y))
   return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
 JRT_END
 JRT_LEAF(int,  SharedRuntime::dcmpg(double x, double y))
   return x<y ? -1 : (x==y ? 0 : 1);  /* x>y or is_nan */
 JRT_END
 // Functions to return the opposite of the aeabi functions for nan.
 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
   return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
 JRT_END
 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
   return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
 JRT_END
 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
   return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
 JRT_END
 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
   return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
 JRT_END
 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
   return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
 JRT_END
 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
   return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
 JRT_END
 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
   return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
 JRT_END
 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
   return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
 JRT_END
 // Intrinsics make gcc generate code for these.
 float  SharedRuntime::fneg(float f)   {
   return -f;
 }
 double SharedRuntime::dneg(double f)  {
   return -f;
 }
 #endif // __SOFTFP__
 #if defined(__SOFTFP__) || defined(E500V2)
 // Intrinsics make gcc generate code for these.
 double SharedRuntime::dabs(double f)  {
   return (f <= (double)0.0) ? (double)0.0 - f : f;
 }
 #endif
 #if defined(__SOFTFP__) || defined(PPC)
 double SharedRuntime::dsqrt(double f) {
   return sqrt(f);
 }
 #endif
 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(JavaThread* thread, address return_address) {
   assert(frame::verify_return_pc(return_address), "must be a return pc");
   // Reset MethodHandle flag.
   thread->set_is_method_handle_return(false);
   // 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");
     // Check if the return address is a MethodHandle call site.
     thread->set_is_method_handle_return(code->is_method_handle_return(return_address));
     // 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");
       // Check if the return address is a MethodHandle call site.
       thread->set_is_method_handle_return(code->is_method_handle_return(return_address));
       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(JavaThread* thread, address return_address))
   return raw_exception_handler_for_return_address(thread, 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()->entry_point();
   } else {
     assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL,
            "polling page safepoint stub not created yet");
     stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
   }
 #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( Symbol* 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_on_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, Symbol* 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->code_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 (t == NULL && nm->is_compiled_by_c1()) {
     assert(nm->unwind_handler_begin() != NULL, "");
     return nm->unwind_handler_begin();
   }
 #endif
   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->code_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() || cb->is_method_handles_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);
           // If there's an unexpected fault, target_pc might be NULL,
           // in which case we want to fall through into the normal
           // error handling code.
         }
         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);
         // If there's an unexpected fault, target_pc might be NULL,
         // in which case we want to fall through into the normal
         // error handling code.
         break; // fall through
       }
       default: ShouldNotReachHere();
     }
     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();
   Symbol* 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");
   Symbol* kname = method->klass_name();
   Symbol* name = method->name();
   Symbol* 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");
   Symbol* kname = method->klass_name();
   Symbol* name = method->name();
   Symbol* 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(caller, bci);
   bc = bytecode.java_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 && bc != Bytecodes::_invokedynamic) {
     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* caller_cb = caller_frame.cb();
   guarantee(caller_cb != NULL && caller_cb->is_nmethod(), "must be called from nmethod");
   nmethod* caller_nm = caller_cb->as_nmethod_or_null();
   // 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(caller_nm);
   // 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
   // JSR 292
   // If the resolved method is a MethodHandle invoke target the call
   // site must be a MethodHandle call site.
   if (callee_method->is_method_handle_invoke()) {
     assert(caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site");
   }
   // 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* callee_nm = callee_method->code();
   nmethodLocker nl_callee(callee_nm);
 #ifdef ASSERT
   address dest_entry_point = callee_nm == NULL ? 0 : callee_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);
   // MethodHandle invokes don't have a CompiledIC and should always
   // simply redispatch to the callee_target.
   address   sender_pc = caller_frame.pc();
   CodeBlob* sender_cb = caller_frame.cb();
   nmethod*  sender_nm = sender_cb->as_nmethod_or_null();
   bool is_mh_invoke_via_adapter = false;  // Direct c2c call or via adapter?
   if (sender_nm != NULL && sender_nm->is_method_handle_return(sender_pc)) {
     // If the callee_target is set, then we have come here via an i2c
     // adapter.
     methodOop callee = thread->callee_target();
     if (callee != NULL) {
       assert(callee->is_method(), "sanity");
       is_mh_invoke_via_adapter = true;
     }
   }
   if (caller_frame.is_interpreted_frame() ||
       caller_frame.is_entry_frame()       ||
       is_mh_invoke_via_adapter) {
     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 attempt 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;
   }
   // The check above makes sure this is a nmethod.
   nmethod* nm = cb->as_nmethod_or_null();
   assert(nm, "must be");
   // Don't fixup MethodHandle call sites as c2i/i2c adapters are used
   // to implement MethodHandle actions.
   if (nm->is_method_handle_return(caller_pc)) {
     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 (nm->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(nm, 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(vfst.method(), 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_wrong_method_type_message(JavaThread* thread,
                                                         oopDesc* required,
                                                         oopDesc* actual) {
   if (TraceMethodHandles) {
     tty->print_cr("WrongMethodType thread="PTR_FORMAT" req="PTR_FORMAT" act="PTR_FORMAT"",
                   thread, required, actual);
   }
   assert(EnableMethodHandles, "");
   oop singleKlass = wrong_method_type_is_for_single_argument(thread, required);
   char* message = NULL;
   if (singleKlass != NULL) {
     const char* objName = "argument or return value";
     if (actual != NULL) {
       // be flexible about the junk passed in:
       klassOop ak = (actual->is_klass()
                      ? (klassOop)actual
                      : actual->klass());
       objName = Klass::cast(ak)->external_name();
     }
     Klass* targetKlass = Klass::cast(required->is_klass()
                                      ? (klassOop)required
                                      : java_lang_Class::as_klassOop(required));
     message = generate_class_cast_message(objName, targetKlass->external_name());
   } else {
     // %%% need to get the MethodType string, without messing around too much
     // Get a signature from the invoke instruction
     const char* mhName = "method handle";
     const char* targetType = "the required signature";
     vframeStream vfst(thread, true);
     if (!vfst.at_end()) {
       Bytecode_invoke call(vfst.method(), vfst.bci());
       methodHandle target;
       {
         EXCEPTION_MARK;
         target = call.static_target(THREAD);
         if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; }
       }
       if (target.not_null()
           && target->is_method_handle_invoke()
           && required == target->method_handle_type()) {
         targetType = target->signature()->as_C_string();
       }
     }
     klassOop kignore; int fignore;
     methodOop actual_method = MethodHandles::decode_method(actual,
                                                           kignore, fignore);
     if (actual_method != NULL) {
       if (methodOopDesc::is_method_handle_invoke_name(actual_method->name()))
         mhName = "$";
       else
         mhName = actual_method->signature()->as_C_string();
       if (mhName[0] == '$')
         mhName = actual_method->signature()->as_C_string();
     }
     message = generate_class_cast_message(mhName, targetType,
                                           " cannot be called as ");
   }
   if (TraceMethodHandles) {
     tty->print_cr("WrongMethodType => message=%s", message);
   }
   return message;
 }
 oop SharedRuntime::wrong_method_type_is_for_single_argument(JavaThread* thr,
                                                             oopDesc* required) {
   if (required == NULL)  return NULL;
   if (required->klass() == SystemDictionary::Class_klass())
     return required;
   if (required->is_klass())
     return Klass::cast(klassOop(required))->java_mirror();
   return NULL;
 }
 char* SharedRuntime::generate_class_cast_message(
     const char* objName, const char* targetKlassName, const char* desc) {
   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 );
   AdapterHandlerLibrary::print_statistics();
   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
 // A simple wrapper class around the calling convention information
 // that allows sharing of adapters for the same calling convention.
 class AdapterFingerPrint : public CHeapObj {
  private:
   union {
     int  _compact[3];
     int* _fingerprint;
   } _value;
   int _length; // A negative length indicates the fingerprint is in the compact form,
                // Otherwise _value._fingerprint is the array.
   // Remap BasicTypes that are handled equivalently by the adapters.
   // These are correct for the current system but someday it might be
   // necessary to make this mapping platform dependent.
   static BasicType adapter_encoding(BasicType in) {
     assert((~0xf & in) == 0, "must fit in 4 bits");
     switch(in) {
       case T_BOOLEAN:
       case T_BYTE:
       case T_SHORT:
       case T_CHAR:
         // There are all promoted to T_INT in the calling convention
         return T_INT;
       case T_OBJECT:
       case T_ARRAY:
 #ifdef _LP64
         return T_LONG;
 #else
         return T_INT;
 #endif
       case T_INT:
       case T_LONG:
       case T_FLOAT:
       case T_DOUBLE:
       case T_VOID:
         return in;
       default:
         ShouldNotReachHere();
         return T_CONFLICT;
     }
   }
  public:
   AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
     // The fingerprint is based on the BasicType signature encoded
     // into an array of ints with four entries per int.
     int* ptr;
     int len = (total_args_passed + 3) >> 2;
     if (len <= (int)(sizeof(_value._compact) / sizeof(int))) {
       _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
       // Storing the signature encoded as signed chars hits about 98%
       // of the time.
       _length = -len;
       ptr = _value._compact;
     } else {
       _length = len;
       _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length);
       ptr = _value._fingerprint;
     }
     // Now pack the BasicTypes with 4 per int
     int sig_index = 0;
     for (int index = 0; index < len; index++) {
       int value = 0;
       for (int byte = 0; byte < 4; byte++) {
         if (sig_index < total_args_passed) {
           value = (value << 4) | adapter_encoding(sig_bt[sig_index++]);
         }
       }
       ptr[index] = value;
     }
   }
   ~AdapterFingerPrint() {
     if (_length > 0) {
       FREE_C_HEAP_ARRAY(int, _value._fingerprint);
     }
   }
   int value(int index) {
     if (_length < 0) {
       return _value._compact[index];
     }
     return _value._fingerprint[index];
   }
   int length() {
     if (_length < 0) return -_length;
     return _length;
   }
   bool is_compact() {
     return _length <= 0;
   }
   unsigned int compute_hash() {
     int hash = 0;
     for (int i = 0; i < length(); i++) {
       int v = value(i);
       hash = (hash << 8) ^ v ^ (hash >> 5);
     }
     return (unsigned int)hash;
   }
   const char* as_string() {
     stringStream st;
     for (int i = 0; i < length(); i++) {
       st.print(PTR_FORMAT, value(i));
     }
     return st.as_string();
   }
   bool equals(AdapterFingerPrint* other) {
     if (other->_length != _length) {
       return false;
     }
     if (_length < 0) {
       return _value._compact[0] == other->_value._compact[0] &&
              _value._compact[1] == other->_value._compact[1] &&
              _value._compact[2] == other->_value._compact[2];
     } else {
       for (int i = 0; i < _length; i++) {
         if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
           return false;
         }
       }
     }
     return true;
   }
 };
 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
 class AdapterHandlerTable : public BasicHashtable {
   friend class AdapterHandlerTableIterator;
  private:
 #ifndef PRODUCT
   static int _lookups; // number of calls to lookup
   static int _buckets; // number of buckets checked
   static int _equals;  // number of buckets checked with matching hash
   static int _hits;    // number of successful lookups
   static int _compact; // number of equals calls with compact signature
 #endif
   AdapterHandlerEntry* bucket(int i) {
     return (AdapterHandlerEntry*)BasicHashtable::bucket(i);
   }
  public:
   AdapterHandlerTable()
     : BasicHashtable(293, sizeof(AdapterHandlerEntry)) { }
   // Create a new entry suitable for insertion in the table
   AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
     AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable::new_entry(fingerprint->compute_hash());
     entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
     return entry;
   }
   // Insert an entry into the table
   void add(AdapterHandlerEntry* entry) {
     int index = hash_to_index(entry->hash());
     add_entry(index, entry);
   }
   void free_entry(AdapterHandlerEntry* entry) {
     entry->deallocate();
     BasicHashtable::free_entry(entry);
   }
   // Find a entry with the same fingerprint if it exists
   AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
     NOT_PRODUCT(_lookups++);
     AdapterFingerPrint fp(total_args_passed, sig_bt);
     unsigned int hash = fp.compute_hash();
     int index = hash_to_index(hash);
     for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
       NOT_PRODUCT(_buckets++);
       if (e->hash() == hash) {
         NOT_PRODUCT(_equals++);
         if (fp.equals(e->fingerprint())) {
 #ifndef PRODUCT
           if (fp.is_compact()) _compact++;
           _hits++;
 #endif
           return e;
         }
       }
     }
     return NULL;
   }
 #ifndef PRODUCT
   void print_statistics() {
     ResourceMark rm;
     int longest = 0;
     int empty = 0;
     int total = 0;
     int nonempty = 0;
     for (int index = 0; index < table_size(); index++) {
       int count = 0;
       for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
         count++;
       }
       if (count != 0) nonempty++;
       if (count == 0) empty++;
       if (count > longest) longest = count;
       total += count;
     }
     tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f",
                   empty, longest, total, total / (double)nonempty);
     tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d",
                   _lookups, _buckets, _equals, _hits, _compact);
   }
 #endif
 };
 #ifndef PRODUCT
 int AdapterHandlerTable::_lookups;
 int AdapterHandlerTable::_buckets;
 int AdapterHandlerTable::_equals;
 int AdapterHandlerTable::_hits;
 int AdapterHandlerTable::_compact;
 #endif
 class AdapterHandlerTableIterator : public StackObj {
  private:
   AdapterHandlerTable* _table;
   int _index;
   AdapterHandlerEntry* _current;
   void scan() {
     while (_index < _table->table_size()) {
       AdapterHandlerEntry* a = _table->bucket(_index);
       _index++;
       if (a != NULL) {
         _current = a;
         return;
       }
     }
   }
  public:
   AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) {
     scan();
   }
   bool has_next() {
     return _current != NULL;
   }
   AdapterHandlerEntry* next() {
     if (_current != NULL) {
       AdapterHandlerEntry* result = _current;
       _current = _current->next();
       if (_current == NULL) scan();
       return result;
     } else {
       return NULL;
     }
   }
 };
 // ---------------------------------------------------------------------------
 // Implementation of AdapterHandlerLibrary
 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
 const int AdapterHandlerLibrary_size = 16*K;
 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
   // Should be called only when AdapterHandlerLibrary_lock is active.
   if (_buffer == NULL) // Initialize lazily
       _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
   return _buffer;
 }
 void AdapterHandlerLibrary::initialize() {
   if (_adapters != NULL) return;
   _adapters = new AdapterHandlerTable();
   // 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();
   _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
                                                               StubRoutines::throw_AbstractMethodError_entry(),
                                                               wrong_method, wrong_method);
 }
 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
                                                       address i2c_entry,
                                                       address c2i_entry,
                                                       address c2i_unverified_entry) {
   return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
 }
 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(methodHandle method) {
   // Use customized signature handler.  Need to lock around updates to
   // the AdapterHandlerTable (it is not safe for concurrent readers
   // and a single writer: this could 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");
   ResourceMark rm;
   NOT_PRODUCT(int insts_size);
   AdapterBlob* B = NULL;
   AdapterHandlerEntry* entry = NULL;
   AdapterFingerPrint* fingerprint = NULL;
   {
     MutexLocker mu(AdapterHandlerLibrary_lock);
     // make sure data structure is initialized
     initialize();
     if (method->is_abstract()) {
       return _abstract_method_handler;
     }
     // 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, "");
     // Lookup method signature's fingerprint
     entry = _adapters->lookup(total_args_passed, sig_bt);
 #ifdef ASSERT
     AdapterHandlerEntry* shared_entry = NULL;
     if (VerifyAdapterSharing && entry != NULL) {
       shared_entry = entry;
       entry = NULL;
     }
 #endif
     if (entry != NULL) {
       return entry;
     }
     // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
     int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
     // Make a C heap allocated version of the fingerprint to store in the adapter
     fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
     // Create I2C & C2I handlers
     BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
     if (buf != NULL) {
       CodeBuffer buffer(buf);
       short buffer_locs[20];
       buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
                                              sizeof(buffer_locs)/sizeof(relocInfo));
       MacroAssembler _masm(&buffer);
       entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
                                                      total_args_passed,
                                                      comp_args_on_stack,
                                                      sig_bt,
                                                      regs,
                                                      fingerprint);
 #ifdef ASSERT
       if (VerifyAdapterSharing) {
         if (shared_entry != NULL) {
           assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size(), total_args_passed, sig_bt),
                  "code must match");
           // Release the one just created and return the original
           _adapters->free_entry(entry);
           return shared_entry;
         } else  {
           entry->save_code(buf->code_begin(), buffer.insts_size(), total_args_passed, sig_bt);
         }
       }
 #endif
       B = AdapterBlob::create(&buffer);
       NOT_PRODUCT(insts_size = buffer.insts_size());
     }
     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.
       MutexUnlocker mu(AdapterHandlerLibrary_lock);
       CompileBroker::handle_full_code_cache();
       return NULL; // Out of CodeCache space
     }
     entry->relocate(B->content_begin());
 #ifndef PRODUCT
     // debugging suppport
     if (PrintAdapterHandlers) {
       tty->cr();
       tty->print_cr("i2c argument handler #%d for: %s %s (fingerprint = %s, %d bytes generated)",
                     _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"),
                     method->signature()->as_C_string(), fingerprint->as_string(), insts_size );
       tty->print_cr("c2i argument handler starts at %p",entry->get_c2i_entry());
       Disassembler::decode(entry->get_i2c_entry(), entry->get_i2c_entry() + insts_size);
     }
 #endif
     _adapters->add(entry);
   }
   // Outside of the lock
   if (B != NULL) {
     char blob_id[256];
     jio_snprintf(blob_id,
                  sizeof(blob_id),
                  "%s(%s)@" PTR_FORMAT,
                  B->name(),
                  fingerprint->as_string(),
                  B->content_begin());
     Forte::register_stub(blob_id, B->content_begin(), B->content_end());
     if (JvmtiExport::should_post_dynamic_code_generated()) {
       JvmtiExport::post_dynamic_code_generated(blob_id, B->content_begin(), B->content_end());
     }
   }
   return entry;
 }
 void AdapterHandlerEntry::relocate(address new_base) {
     ptrdiff_t delta = new_base - _i2c_entry;
     _i2c_entry += delta;
     _c2i_entry += delta;
     _c2i_unverified_entry += delta;
 }
 void AdapterHandlerEntry::deallocate() {
   delete _fingerprint;
 #ifdef ASSERT
   if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
   if (_saved_sig)  FREE_C_HEAP_ARRAY(Basictype, _saved_sig);
 #endif
 }
 #ifdef ASSERT
 // Capture the code before relocation so that it can be compared
 // against other versions.  If the code is captured after relocation
 // then relative instructions won't be equivalent.
 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length, int total_args_passed, BasicType* sig_bt) {
   _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length);
   _code_length = length;
   memcpy(_saved_code, buffer, length);
   _total_args_passed = total_args_passed;
   _saved_sig = NEW_C_HEAP_ARRAY(BasicType, _total_args_passed);
   memcpy(_saved_sig, sig_bt, _total_args_passed * sizeof(BasicType));
 }
 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length, int total_args_passed, BasicType* sig_bt) {
   if (length != _code_length) {
     return false;
   }
   for (int i = 0; i < length; i++) {
     if (buffer[i] != _saved_code[i]) {
       return false;
     }
   }
   return true;
 }
 #endif
 // 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;
     }
     ResourceMark rm;
     BufferBlob*  buf = buffer_blob(); // the temporary code buffer in CodeCache
     if (buf != NULL) {
       CodeBuffer buffer(buf);
       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
     CompileBroker::handle_full_code_cache();
   }
   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;
     }
     ResourceMark rm;
     BufferBlob*  buf = buffer_blob(); // the temporary code buffer in CodeCache
     if (buf != NULL) {
       CodeBuffer buffer(buf);
       // 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);
   assert(typeArrayKlass::cast(jlsValue->klass())->element_type() == T_CHAR, "compressed string");
   (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(Symbol* sig, bool has_receiver, 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 (has_receiver) {
     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");
   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
 bool AdapterHandlerLibrary::contains(CodeBlob* b) {
   AdapterHandlerTableIterator iter(_adapters);
   while (iter.has_next()) {
     AdapterHandlerEntry* a = iter.next();
     if ( b == CodeCache::find_blob(a->get_i2c_entry()) ) return true;
   }
   return false;
 }
 void AdapterHandlerLibrary::print_handler_on(outputStream* st, CodeBlob* b) {
   AdapterHandlerTableIterator iter(_adapters);
   while (iter.has_next()) {
     AdapterHandlerEntry* a = iter.next();
     if ( b == CodeCache::find_blob(a->get_i2c_entry()) ) {
       st->print("Adapter for signature: ");
       st->print_cr("%s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT,
                    a->fingerprint()->as_string(),
                    a->get_i2c_entry(), a->get_c2i_entry(), a->get_c2i_unverified_entry());
       return;
     }
   }
   assert(false, "Should have found handler");
 }
 #ifndef PRODUCT
 void AdapterHandlerLibrary::print_statistics() {
   _adapters->print_statistics();
 }
 #endif /* PRODUCT */

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/sharedRuntime.cpp@23ae54207126 (annotated)

src/share/vm/runtime/sharedRuntime.cpp