jdk8-mips64-public/hotspot: src/share/vm/runtime/vframeArray.cpp@d3f3f7677537 (annotated)

src/share/vm/runtime/vframeArray.cpp@d3f3f7677537 (annotated)

src/share/vm/runtime/vframeArray.cpp

Tue, 25 Nov 2014 17:33:59 +0100

author: roland
date: Tue, 25 Nov 2014 17:33:59 +0100
changeset 7419: d3f3f7677537
parent 6723: 0bf37f737702
child 7535: 7ae4e26cb1e0
permissions: -rw-r--r--

6898462: The escape analysis with G1 cause crash assertion src/share/vm/runtime/vframeArray.cpp:94
Summary: OOM during reallocation of scalar replaced objects in deoptimization causes crashes
Reviewed-by: kvn, jrose

 /*
  * Copyright (c) 1997, 2014, 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/vmSymbols.hpp"
 #include "interpreter/bytecode.hpp"
 #include "interpreter/interpreter.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/resourceArea.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/methodData.hpp"
 #include "oops/oop.inline.hpp"
 #include "prims/jvmtiThreadState.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/monitorChunk.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/vframe.hpp"
 #include "runtime/vframeArray.hpp"
 #include "runtime/vframe_hp.hpp"
 #include "utilities/events.hpp"
 #ifdef COMPILER2
 #include "opto/runtime.hpp"
 #endif
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 int vframeArrayElement:: bci(void) const { return (_bci == SynchronizationEntryBCI ? 0 : _bci); }
 void vframeArrayElement::free_monitors(JavaThread* jt) {
   if (_monitors != NULL) {
      MonitorChunk* chunk = _monitors;
      _monitors = NULL;
      jt->remove_monitor_chunk(chunk);
      delete chunk;
   }
 }
 void vframeArrayElement::fill_in(compiledVFrame* vf, bool realloc_failures) {
 // Copy the information from the compiled vframe to the
 // interpreter frame we will be creating to replace vf
   _method = vf->method();
   _bci    = vf->raw_bci();
   _reexecute = vf->should_reexecute();
 #ifdef ASSERT
   _removed_monitors = false;
 #endif
   int index;
   // Get the monitors off-stack
   GrowableArray<MonitorInfo*>* list = vf->monitors();
   if (list->is_empty()) {
     _monitors = NULL;
   } else {
     // Allocate monitor chunk
     _monitors = new MonitorChunk(list->length());
     vf->thread()->add_monitor_chunk(_monitors);
     // Migrate the BasicLocks from the stack to the monitor chunk
     for (index = 0; index < list->length(); index++) {
       MonitorInfo* monitor = list->at(index);
       assert(!monitor->owner_is_scalar_replaced() || realloc_failures, "object should be reallocated already");
       BasicObjectLock* dest = _monitors->at(index);
       if (monitor->owner_is_scalar_replaced()) {
         dest->set_obj(NULL);
       } else {
         assert(monitor->owner() == NULL || (!monitor->owner()->is_unlocked() && !monitor->owner()->has_bias_pattern()), "object must be null or locked, and unbiased");
         dest->set_obj(monitor->owner());
         monitor->lock()->move_to(monitor->owner(), dest->lock());
       }
     }
   }
   // Convert the vframe locals and expressions to off stack
   // values. Because we will not gc all oops can be converted to
   // intptr_t (i.e. a stack slot) and we are fine. This is
   // good since we are inside a HandleMark and the oops in our
   // collection would go away between packing them here and
   // unpacking them in unpack_on_stack.
   // First the locals go off-stack
   // FIXME this seems silly it creates a StackValueCollection
   // in order to get the size to then copy them and
   // convert the types to intptr_t size slots. Seems like it
   // could do it in place... Still uses less memory than the
   // old way though
   StackValueCollection *locs = vf->locals();
   _locals = new StackValueCollection(locs->size());
   for(index = 0; index < locs->size(); index++) {
     StackValue* value = locs->at(index);
     switch(value->type()) {
       case T_OBJECT:
         assert(!value->obj_is_scalar_replaced() || realloc_failures, "object should be reallocated already");
         // preserve object type
         _locals->add( new StackValue(cast_from_oop<intptr_t>((value->get_obj()())), T_OBJECT ));
         break;
       case T_CONFLICT:
         // A dead local.  Will be initialized to null/zero.
         _locals->add( new StackValue());
         break;
       case T_INT:
         _locals->add( new StackValue(value->get_int()));
         break;
       default:
         ShouldNotReachHere();
     }
   }
   // Now the expressions off-stack
   // Same silliness as above
   StackValueCollection *exprs = vf->expressions();
   _expressions = new StackValueCollection(exprs->size());
   for(index = 0; index < exprs->size(); index++) {
     StackValue* value = exprs->at(index);
     switch(value->type()) {
       case T_OBJECT:
         assert(!value->obj_is_scalar_replaced() || realloc_failures, "object should be reallocated already");
         // preserve object type
         _expressions->add( new StackValue(cast_from_oop<intptr_t>((value->get_obj()())), T_OBJECT ));
         break;
       case T_CONFLICT:
         // A dead stack element.  Will be initialized to null/zero.
         // This can occur when the compiler emits a state in which stack
         // elements are known to be dead (because of an imminent exception).
         _expressions->add( new StackValue());
         break;
       case T_INT:
         _expressions->add( new StackValue(value->get_int()));
         break;
       default:
         ShouldNotReachHere();
     }
   }
 }
 int unpack_counter = 0;
 void vframeArrayElement::unpack_on_stack(int caller_actual_parameters,
                                          int callee_parameters,
                                          int callee_locals,
                                          frame* caller,
                                          bool is_top_frame,
                                          bool is_bottom_frame,
                                          int exec_mode) {
   JavaThread* thread = (JavaThread*) Thread::current();
   // Look at bci and decide on bcp and continuation pc
   address bcp;
   // C++ interpreter doesn't need a pc since it will figure out what to do when it
   // begins execution
   address pc;
   bool use_next_mdp = false; // true if we should use the mdp associated with the next bci
                              // rather than the one associated with bcp
   if (raw_bci() == SynchronizationEntryBCI) {
     // We are deoptimizing while hanging in prologue code for synchronized method
     bcp = method()->bcp_from(0); // first byte code
     pc  = Interpreter::deopt_entry(vtos, 0); // step = 0 since we don't skip current bytecode
   } else if (should_reexecute()) { //reexecute this bytecode
     assert(is_top_frame, "reexecute allowed only for the top frame");
     bcp = method()->bcp_from(bci());
     pc  = Interpreter::deopt_reexecute_entry(method(), bcp);
   } else {
     bcp = method()->bcp_from(bci());
     pc  = Interpreter::deopt_continue_after_entry(method(), bcp, callee_parameters, is_top_frame);
     use_next_mdp = true;
   }
   assert(Bytecodes::is_defined(*bcp), "must be a valid bytecode");
   // Monitorenter and pending exceptions:
   //
   // For Compiler2, there should be no pending exception when deoptimizing at monitorenter
   // because there is no safepoint at the null pointer check (it is either handled explicitly
   // or prior to the monitorenter) and asynchronous exceptions are not made "pending" by the
   // runtime interface for the slow case (see JRT_ENTRY_FOR_MONITORENTER).  If an asynchronous
   // exception was processed, the bytecode pointer would have to be extended one bytecode beyond
   // the monitorenter to place it in the proper exception range.
   //
   // For Compiler1, deoptimization can occur while throwing a NullPointerException at monitorenter,
   // in which case bcp should point to the monitorenter since it is within the exception's range.
   assert(*bcp != Bytecodes::_monitorenter || is_top_frame, "a _monitorenter must be a top frame");
   assert(thread->deopt_nmethod() != NULL, "nmethod should be known");
   guarantee(!(thread->deopt_nmethod()->is_compiled_by_c2() &&
               *bcp == Bytecodes::_monitorenter             &&
               exec_mode == Deoptimization::Unpack_exception),
             "shouldn't get exception during monitorenter");
   int popframe_preserved_args_size_in_bytes = 0;
   int popframe_preserved_args_size_in_words = 0;
   if (is_top_frame) {
     JvmtiThreadState *state = thread->jvmti_thread_state();
     if (JvmtiExport::can_pop_frame() &&
         (thread->has_pending_popframe() || thread->popframe_forcing_deopt_reexecution())) {
       if (thread->has_pending_popframe()) {
         // Pop top frame after deoptimization
 #ifndef CC_INTERP
         pc = Interpreter::remove_activation_preserving_args_entry();
 #else
         // Do an uncommon trap type entry. c++ interpreter will know
         // to pop frame and preserve the args
         pc = Interpreter::deopt_entry(vtos, 0);
         use_next_mdp = false;
 #endif
       } else {
         // Reexecute invoke in top frame
         pc = Interpreter::deopt_entry(vtos, 0);
         use_next_mdp = false;
         popframe_preserved_args_size_in_bytes = in_bytes(thread->popframe_preserved_args_size());
         // Note: the PopFrame-related extension of the expression stack size is done in
         // Deoptimization::fetch_unroll_info_helper
         popframe_preserved_args_size_in_words = in_words(thread->popframe_preserved_args_size_in_words());
       }
     } else if (JvmtiExport::can_force_early_return() && state != NULL && state->is_earlyret_pending()) {
       // Force early return from top frame after deoptimization
 #ifndef CC_INTERP
       pc = Interpreter::remove_activation_early_entry(state->earlyret_tos());
 #endif
     } else {
       // Possibly override the previous pc computation of the top (youngest) frame
       switch (exec_mode) {
       case Deoptimization::Unpack_deopt:
         // use what we've got
         break;
       case Deoptimization::Unpack_exception:
         // exception is pending
         pc = SharedRuntime::raw_exception_handler_for_return_address(thread, pc);
         // [phh] We're going to end up in some handler or other, so it doesn't
         // matter what mdp we point to.  See exception_handler_for_exception()
         // in interpreterRuntime.cpp.
         break;
       case Deoptimization::Unpack_uncommon_trap:
       case Deoptimization::Unpack_reexecute:
         // redo last byte code
         pc  = Interpreter::deopt_entry(vtos, 0);
         use_next_mdp = false;
         break;
       default:
         ShouldNotReachHere();
       }
     }
   }
   // Setup the interpreter frame
   assert(method() != NULL, "method must exist");
   int temps = expressions()->size();
   int locks = monitors() == NULL ? 0 : monitors()->number_of_monitors();
   Interpreter::layout_activation(method(),
                                  temps + callee_parameters,
                                  popframe_preserved_args_size_in_words,
                                  locks,
                                  caller_actual_parameters,
                                  callee_parameters,
                                  callee_locals,
                                  caller,
                                  iframe(),
                                  is_top_frame,
                                  is_bottom_frame);
   // Update the pc in the frame object and overwrite the temporary pc
   // we placed in the skeletal frame now that we finally know the
   // exact interpreter address we should use.
   _frame.patch_pc(thread, pc);
   assert (!method()->is_synchronized() || locks > 0 || _removed_monitors, "synchronized methods must have monitors");
   BasicObjectLock* top = iframe()->interpreter_frame_monitor_begin();
   for (int index = 0; index < locks; index++) {
     top = iframe()->previous_monitor_in_interpreter_frame(top);
     BasicObjectLock* src = _monitors->at(index);
     top->set_obj(src->obj());
     src->lock()->move_to(src->obj(), top->lock());
   }
   if (ProfileInterpreter) {
     iframe()->interpreter_frame_set_mdx(0); // clear out the mdp.
   }
   iframe()->interpreter_frame_set_bcx((intptr_t)bcp); // cannot use bcp because frame is not initialized yet
   if (ProfileInterpreter) {
     MethodData* mdo = method()->method_data();
     if (mdo != NULL) {
       int bci = iframe()->interpreter_frame_bci();
       if (use_next_mdp) ++bci;
       address mdp = mdo->bci_to_dp(bci);
       iframe()->interpreter_frame_set_mdp(mdp);
     }
   }
   // Unpack expression stack
   // If this is an intermediate frame (i.e. not top frame) then this
   // only unpacks the part of the expression stack not used by callee
   // as parameters. The callee parameters are unpacked as part of the
   // callee locals.
   int i;
   for(i = 0; i < expressions()->size(); i++) {
     StackValue *value = expressions()->at(i);
     intptr_t*   addr  = iframe()->interpreter_frame_expression_stack_at(i);
     switch(value->type()) {
       case T_INT:
         *addr = value->get_int();
         break;
       case T_OBJECT:
         *addr = value->get_int(T_OBJECT);
         break;
       case T_CONFLICT:
         // A dead stack slot.  Initialize to null in case it is an oop.
         *addr = NULL_WORD;
         break;
       default:
         ShouldNotReachHere();
     }
   }
   // Unpack the locals
   for(i = 0; i < locals()->size(); i++) {
     StackValue *value = locals()->at(i);
     intptr_t* addr  = iframe()->interpreter_frame_local_at(i);
     switch(value->type()) {
       case T_INT:
         *addr = value->get_int();
         break;
       case T_OBJECT:
         *addr = value->get_int(T_OBJECT);
         break;
       case T_CONFLICT:
         // A dead location. If it is an oop then we need a NULL to prevent GC from following it
         *addr = NULL_WORD;
         break;
       default:
         ShouldNotReachHere();
     }
   }
   if (is_top_frame && JvmtiExport::can_pop_frame() && thread->popframe_forcing_deopt_reexecution()) {
     // An interpreted frame was popped but it returns to a deoptimized
     // frame. The incoming arguments to the interpreted activation
     // were preserved in thread-local storage by the
     // remove_activation_preserving_args_entry in the interpreter; now
     // we put them back into the just-unpacked interpreter frame.
     // Note that this assumes that the locals arena grows toward lower
     // addresses.
     if (popframe_preserved_args_size_in_words != 0) {
       void* saved_args = thread->popframe_preserved_args();
       assert(saved_args != NULL, "must have been saved by interpreter");
 #ifdef ASSERT
       assert(popframe_preserved_args_size_in_words <=
              iframe()->interpreter_frame_expression_stack_size()*Interpreter::stackElementWords,
              "expression stack size should have been extended");
 #endif // ASSERT
       int top_element = iframe()->interpreter_frame_expression_stack_size()-1;
       intptr_t* base;
       if (frame::interpreter_frame_expression_stack_direction() < 0) {
         base = iframe()->interpreter_frame_expression_stack_at(top_element);
       } else {
         base = iframe()->interpreter_frame_expression_stack();
       }
       Copy::conjoint_jbytes(saved_args,
                             base,
                             popframe_preserved_args_size_in_bytes);
       thread->popframe_free_preserved_args();
     }
   }
 #ifndef PRODUCT
   if (TraceDeoptimization && Verbose) {
     ttyLocker ttyl;
     tty->print_cr("[%d Interpreted Frame]", ++unpack_counter);
     iframe()->print_on(tty);
     RegisterMap map(thread);
     vframe* f = vframe::new_vframe(iframe(), &map, thread);
     f->print();
     tty->print_cr("locals size     %d", locals()->size());
     tty->print_cr("expression size %d", expressions()->size());
     method()->print_value();
     tty->cr();
     // method()->print_codes();
   } else if (TraceDeoptimization) {
     tty->print("     ");
     method()->print_value();
     Bytecodes::Code code = Bytecodes::java_code_at(method(), bcp);
     int bci = method()->bci_from(bcp);
     tty->print(" - %s", Bytecodes::name(code));
     tty->print(" @ bci %d ", bci);
     tty->print_cr("sp = " PTR_FORMAT, iframe()->sp());
   }
 #endif // PRODUCT
   // The expression stack and locals are in the resource area don't leave
   // a dangling pointer in the vframeArray we leave around for debug
   // purposes
   _locals = _expressions = NULL;
 }
 int vframeArrayElement::on_stack_size(int callee_parameters,
                                       int callee_locals,
                                       bool is_top_frame,
                                       int popframe_extra_stack_expression_els) const {
   assert(method()->max_locals() == locals()->size(), "just checking");
   int locks = monitors() == NULL ? 0 : monitors()->number_of_monitors();
   int temps = expressions()->size();
   return Interpreter::size_activation(method()->max_stack(),
                                       temps + callee_parameters,
                                       popframe_extra_stack_expression_els,
                                       locks,
                                       callee_parameters,
                                       callee_locals,
                                       is_top_frame);
 }
 vframeArray* vframeArray::allocate(JavaThread* thread, int frame_size, GrowableArray<compiledVFrame*>* chunk,
                                    RegisterMap *reg_map, frame sender, frame caller, frame self,
                                    bool realloc_failures) {
   // Allocate the vframeArray
   vframeArray * result = (vframeArray*) AllocateHeap(sizeof(vframeArray) + // fixed part
                                                      sizeof(vframeArrayElement) * (chunk->length() - 1), // variable part
                                                      mtCompiler);
   result->_frames = chunk->length();
   result->_owner_thread = thread;
   result->_sender = sender;
   result->_caller = caller;
   result->_original = self;
   result->set_unroll_block(NULL); // initialize it
   result->fill_in(thread, frame_size, chunk, reg_map, realloc_failures);
   return result;
 }
 void vframeArray::fill_in(JavaThread* thread,
                           int frame_size,
                           GrowableArray<compiledVFrame*>* chunk,
                           const RegisterMap *reg_map,
                           bool realloc_failures) {
   // Set owner first, it is used when adding monitor chunks
   _frame_size = frame_size;
   for(int i = 0; i < chunk->length(); i++) {
     element(i)->fill_in(chunk->at(i), realloc_failures);
   }
   // Copy registers for callee-saved registers
   if (reg_map != NULL) {
     for(int i = 0; i < RegisterMap::reg_count; i++) {
 #ifdef AMD64
       // The register map has one entry for every int (32-bit value), so
       // 64-bit physical registers have two entries in the map, one for
       // each half.  Ignore the high halves of 64-bit registers, just like
       // frame::oopmapreg_to_location does.
       //
       // [phh] FIXME: this is a temporary hack!  This code *should* work
       // correctly w/o this hack, possibly by changing RegisterMap::pd_location
       // in frame_amd64.cpp and the values of the phantom high half registers
       // in amd64.ad.
       //      if (VMReg::Name(i) < SharedInfo::stack0 && is_even(i)) {
         intptr_t* src = (intptr_t*) reg_map->location(VMRegImpl::as_VMReg(i));
         _callee_registers[i] = src != NULL ? *src : NULL_WORD;
         //      } else {
         //      jint* src = (jint*) reg_map->location(VMReg::Name(i));
         //      _callee_registers[i] = src != NULL ? *src : NULL_WORD;
         //      }
 #else
       jint* src = (jint*) reg_map->location(VMRegImpl::as_VMReg(i));
       _callee_registers[i] = src != NULL ? *src : NULL_WORD;
 #endif
       if (src == NULL) {
         set_location_valid(i, false);
       } else {
         set_location_valid(i, true);
         jint* dst = (jint*) register_location(i);
         *dst = *src;
       }
     }
   }
 }
 void vframeArray::unpack_to_stack(frame &unpack_frame, int exec_mode, int caller_actual_parameters) {
   // stack picture
   //   unpack_frame
   //   [new interpreter frames ] (frames are skeletal but walkable)
   //   caller_frame
   //
   //  This routine fills in the missing data for the skeletal interpreter frames
   //  in the above picture.
   // Find the skeletal interpreter frames to unpack into
   JavaThread* THREAD = JavaThread::current();
   RegisterMap map(THREAD, false);
   // Get the youngest frame we will unpack (last to be unpacked)
   frame me = unpack_frame.sender(&map);
   int index;
   for (index = 0; index < frames(); index++ ) {
     *element(index)->iframe() = me;
     // Get the caller frame (possibly skeletal)
     me = me.sender(&map);
   }
   // Do the unpacking of interpreter frames; the frame at index 0 represents the top activation, so it has no callee
   // Unpack the frames from the oldest (frames() -1) to the youngest (0)
   frame* caller_frame = &me;
   for (index = frames() - 1; index >= 0 ; index--) {
     vframeArrayElement* elem = element(index);  // caller
     int callee_parameters, callee_locals;
     if (index == 0) {
       callee_parameters = callee_locals = 0;
     } else {
       methodHandle caller = elem->method();
       methodHandle callee = element(index - 1)->method();
       Bytecode_invoke inv(caller, elem->bci());
       // invokedynamic instructions don't have a class but obviously don't have a MemberName appendix.
       // NOTE:  Use machinery here that avoids resolving of any kind.
       const bool has_member_arg =
           !inv.is_invokedynamic() && MethodHandles::has_member_arg(inv.klass(), inv.name());
       callee_parameters = callee->size_of_parameters() + (has_member_arg ? 1 : 0);
       callee_locals     = callee->max_locals();
     }
     elem->unpack_on_stack(caller_actual_parameters,
                           callee_parameters,
                           callee_locals,
                           caller_frame,
                           index == 0,
                           index == frames() - 1,
                           exec_mode);
     if (index == frames() - 1) {
       Deoptimization::unwind_callee_save_values(elem->iframe(), this);
     }
     caller_frame = elem->iframe();
     caller_actual_parameters = callee_parameters;
   }
   deallocate_monitor_chunks();
 }
 void vframeArray::deallocate_monitor_chunks() {
   JavaThread* jt = JavaThread::current();
   for (int index = 0; index < frames(); index++ ) {
      element(index)->free_monitors(jt);
   }
 }
 #ifndef PRODUCT
 bool vframeArray::structural_compare(JavaThread* thread, GrowableArray<compiledVFrame*>* chunk) {
   if (owner_thread() != thread) return false;
   int index = 0;
 #if 0 // FIXME can't do this comparison
   // Compare only within vframe array.
   for (deoptimizedVFrame* vf = deoptimizedVFrame::cast(vframe_at(first_index())); vf; vf = vf->deoptimized_sender_or_null()) {
     if (index >= chunk->length() || !vf->structural_compare(chunk->at(index))) return false;
     index++;
   }
   if (index != chunk->length()) return false;
 #endif
   return true;
 }
 #endif
 address vframeArray::register_location(int i) const {
   assert(0 <= i && i < RegisterMap::reg_count, "index out of bounds");
   return (address) & _callee_registers[i];
 }
 #ifndef PRODUCT
 // Printing
 // Note: we cannot have print_on as const, as we allocate inside the method
 void vframeArray::print_on_2(outputStream* st)  {
   st->print_cr(" - sp: " INTPTR_FORMAT, sp());
   st->print(" - thread: ");
   Thread::current()->print();
   st->print_cr(" - frame size: %d", frame_size());
   for (int index = 0; index < frames() ; index++ ) {
     element(index)->print(st);
   }
 }
 void vframeArrayElement::print(outputStream* st) {
   st->print_cr(" - interpreter_frame -> sp: " INTPTR_FORMAT, iframe()->sp());
 }
 void vframeArray::print_value_on(outputStream* st) const {
   st->print_cr("vframeArray [%d] ", frames());
 }
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/vframeArray.cpp@d3f3f7677537 (annotated)

src/share/vm/runtime/vframeArray.cpp