jdk8-mips64-public/hotspot: src/share/vm/opto/doCall.cpp@96ef09c26978 (annotated)

src/share/vm/opto/doCall.cpp@96ef09c26978 (annotated)

src/share/vm/opto/doCall.cpp

Sat, 16 Mar 2013 07:39:14 -0700

author: morris
date: Sat, 16 Mar 2013 07:39:14 -0700
changeset 4760: 96ef09c26978
parent 4447: f1de9dbc914e
child 5110: 6f3fd5150b67
permissions: -rw-r--r--

8009166: [parfait] Null pointer deference in hotspot/src/share/vm/opto/type.cpp
Summary: add guarantee() to as_instance_type()
Reviewed-by: kvn, twisti

 /*
  * Copyright (c) 1998, 2012, 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 "ci/ciCallSite.hpp"
 #include "ci/ciMethodHandle.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "compiler/compileBroker.hpp"
 #include "compiler/compileLog.hpp"
 #include "interpreter/linkResolver.hpp"
 #include "opto/addnode.hpp"
 #include "opto/callGenerator.hpp"
 #include "opto/cfgnode.hpp"
 #include "opto/mulnode.hpp"
 #include "opto/parse.hpp"
 #include "opto/rootnode.hpp"
 #include "opto/runtime.hpp"
 #include "opto/subnode.hpp"
 #include "prims/nativeLookup.hpp"
 #include "runtime/sharedRuntime.hpp"
 void trace_type_profile(Compile* C, ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
   if (TraceTypeProfile || PrintInlining NOT_PRODUCT(|| PrintOptoInlining)) {
     outputStream* out = tty;
     if (!PrintInlining) {
       if (NOT_PRODUCT(!PrintOpto &&) !PrintCompilation) {
         method->print_short_name();
         tty->cr();
       }
       CompileTask::print_inlining(prof_method, depth, bci);
     } else {
       out = C->print_inlining_stream();
     }
     CompileTask::print_inline_indent(depth, out);
     out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count);
     stringStream ss;
     prof_klass->name()->print_symbol_on(&ss);
     out->print(ss.as_string());
     out->cr();
   }
 }
 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch,
                                        JVMState* jvms, bool allow_inline,
                                        float prof_factor, bool allow_intrinsics, bool delayed_forbidden) {
   ciMethod*       caller   = jvms->method();
   int             bci      = jvms->bci();
   Bytecodes::Code bytecode = caller->java_code_at_bci(bci);
   guarantee(callee != NULL, "failed method resolution");
   // Dtrace currently doesn't work unless all calls are vanilla
   if (env()->dtrace_method_probes()) {
     allow_inline = false;
   }
   // Note: When we get profiling during stage-1 compiles, we want to pull
   // from more specific profile data which pertains to this inlining.
   // Right now, ignore the information in jvms->caller(), and do method[bci].
   ciCallProfile profile = caller->call_profile_at_bci(bci);
   // See how many times this site has been invoked.
   int site_count = profile.count();
   int receiver_count = -1;
   if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) {
     // Receivers in the profile structure are ordered by call counts
     // so that the most called (major) receiver is profile.receiver(0).
     receiver_count = profile.receiver_count(0);
   }
   CompileLog* log = this->log();
   if (log != NULL) {
     int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
     int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
     log->begin_elem("call method='%d' count='%d' prof_factor='%g'",
                     log->identify(callee), site_count, prof_factor);
     if (call_does_dispatch)  log->print(" virtual='1'");
     if (allow_inline)     log->print(" inline='1'");
     if (receiver_count >= 0) {
       log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
       if (profile.has_receiver(1)) {
         log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
       }
     }
     log->end_elem();
   }
   // Special case the handling of certain common, profitable library
   // methods.  If these methods are replaced with specialized code,
   // then we return it as the inlined version of the call.
   // We do this before the strict f.p. check below because the
   // intrinsics handle strict f.p. correctly.
   if (allow_inline && allow_intrinsics) {
     CallGenerator* cg = find_intrinsic(callee, call_does_dispatch);
     if (cg != NULL) {
       if (cg->is_predicted()) {
         // Code without intrinsic but, hopefully, inlined.
         CallGenerator* inline_cg = this->call_generator(callee,
               vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, false);
         if (inline_cg != NULL) {
           cg = CallGenerator::for_predicted_intrinsic(cg, inline_cg);
         }
       }
       return cg;
     }
   }
   // Do method handle calls.
   // NOTE: This must happen before normal inlining logic below since
   // MethodHandle.invoke* are native methods which obviously don't
   // have bytecodes and so normal inlining fails.
   if (callee->is_method_handle_intrinsic()) {
     CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, delayed_forbidden);
     assert(cg == NULL || !delayed_forbidden || !cg->is_late_inline() || cg->is_mh_late_inline(), "unexpected CallGenerator");
     return cg;
   }
   // Do not inline strict fp into non-strict code, or the reverse
   if (caller->is_strict() ^ callee->is_strict()) {
     allow_inline = false;
   }
   // Attempt to inline...
   if (allow_inline) {
     // The profile data is only partly attributable to this caller,
     // scale back the call site information.
     float past_uses = jvms->method()->scale_count(site_count, prof_factor);
     // This is the number of times we expect the call code to be used.
     float expected_uses = past_uses;
     // Try inlining a bytecoded method:
     if (!call_does_dispatch) {
       InlineTree* ilt;
       if (UseOldInlining) {
         ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
       } else {
         // Make a disembodied, stateless ILT.
         // TO DO:  When UseOldInlining is removed, copy the ILT code elsewhere.
         float site_invoke_ratio = prof_factor;
         // Note:  ilt is for the root of this parse, not the present call site.
         ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, MaxInlineLevel);
       }
       WarmCallInfo scratch_ci;
       if (!UseOldInlining)
         scratch_ci.init(jvms, callee, profile, prof_factor);
       bool should_delay = false;
       WarmCallInfo* ci = ilt->ok_to_inline(callee, jvms, profile, &scratch_ci, should_delay);
       assert(ci != &scratch_ci, "do not let this pointer escape");
       bool allow_inline   = (ci != NULL && !ci->is_cold());
       bool require_inline = (allow_inline && ci->is_hot());
       if (allow_inline) {
         CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses);
         if (require_inline && cg != NULL) {
           // Delay the inlining of this method to give us the
           // opportunity to perform some high level optimizations
           // first.
           if (should_delay_inlining(callee, jvms)) {
             assert(!delayed_forbidden, "strange");
             return CallGenerator::for_string_late_inline(callee, cg);
           } else if ((should_delay || AlwaysIncrementalInline) && !delayed_forbidden) {
             return CallGenerator::for_late_inline(callee, cg);
           }
         }
         if (cg == NULL || should_delay) {
           // Fall through.
         } else if (require_inline || !InlineWarmCalls) {
           return cg;
         } else {
           CallGenerator* cold_cg = call_generator(callee, vtable_index, call_does_dispatch, jvms, false, prof_factor);
           return CallGenerator::for_warm_call(ci, cold_cg, cg);
         }
       }
     }
     // Try using the type profile.
     if (call_does_dispatch && site_count > 0 && receiver_count > 0) {
       // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
       bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
       ciMethod* receiver_method = NULL;
       if (have_major_receiver || profile.morphism() == 1 ||
           (profile.morphism() == 2 && UseBimorphicInlining)) {
         // receiver_method = profile.method();
         // Profiles do not suggest methods now.  Look it up in the major receiver.
         receiver_method = callee->resolve_invoke(jvms->method()->holder(),
                                                       profile.receiver(0));
       }
       if (receiver_method != NULL) {
         // The single majority receiver sufficiently outweighs the minority.
         CallGenerator* hit_cg = this->call_generator(receiver_method,
               vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
         if (hit_cg != NULL) {
           // Look up second receiver.
           CallGenerator* next_hit_cg = NULL;
           ciMethod* next_receiver_method = NULL;
           if (profile.morphism() == 2 && UseBimorphicInlining) {
             next_receiver_method = callee->resolve_invoke(jvms->method()->holder(),
                                                                profile.receiver(1));
             if (next_receiver_method != NULL) {
               next_hit_cg = this->call_generator(next_receiver_method,
                                   vtable_index, !call_does_dispatch, jvms,
                                   allow_inline, prof_factor);
               if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
                   have_major_receiver && UseOnlyInlinedBimorphic) {
                   // Skip if we can't inline second receiver's method
                   next_hit_cg = NULL;
               }
             }
           }
           CallGenerator* miss_cg;
           Deoptimization::DeoptReason reason = (profile.morphism() == 2) ?
                                     Deoptimization::Reason_bimorphic :
                                     Deoptimization::Reason_class_check;
           if (( profile.morphism() == 1 ||
                (profile.morphism() == 2 && next_hit_cg != NULL) ) &&
               !too_many_traps(jvms->method(), jvms->bci(), reason)
              ) {
             // Generate uncommon trap for class check failure path
             // in case of monomorphic or bimorphic virtual call site.
             miss_cg = CallGenerator::for_uncommon_trap(callee, reason,
                         Deoptimization::Action_maybe_recompile);
           } else {
             // Generate virtual call for class check failure path
             // in case of polymorphic virtual call site.
             miss_cg = CallGenerator::for_virtual_call(callee, vtable_index);
           }
           if (miss_cg != NULL) {
             if (next_hit_cg != NULL) {
               trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1));
               // We don't need to record dependency on a receiver here and below.
               // Whenever we inline, the dependency is added by Parse::Parse().
               miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
             }
             if (miss_cg != NULL) {
               trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count);
               CallGenerator* cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0));
               if (cg != NULL)  return cg;
             }
           }
         }
       }
     }
   }
   // There was no special inlining tactic, or it bailed out.
   // Use a more generic tactic, like a simple call.
   if (call_does_dispatch) {
     return CallGenerator::for_virtual_call(callee, vtable_index);
   } else {
     // Class Hierarchy Analysis or Type Profile reveals a unique target,
     // or it is a static or special call.
     return CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms));
   }
 }
 // Return true for methods that shouldn't be inlined early so that
 // they are easier to analyze and optimize as intrinsics.
 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) {
   if (has_stringbuilder()) {
     if ((call_method->holder() == C->env()->StringBuilder_klass() ||
          call_method->holder() == C->env()->StringBuffer_klass()) &&
         (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
          jvms->method()->holder() == C->env()->StringBuffer_klass())) {
       // Delay SB calls only when called from non-SB code
       return false;
     }
     switch (call_method->intrinsic_id()) {
       case vmIntrinsics::_StringBuilder_void:
       case vmIntrinsics::_StringBuilder_int:
       case vmIntrinsics::_StringBuilder_String:
       case vmIntrinsics::_StringBuilder_append_char:
       case vmIntrinsics::_StringBuilder_append_int:
       case vmIntrinsics::_StringBuilder_append_String:
       case vmIntrinsics::_StringBuilder_toString:
       case vmIntrinsics::_StringBuffer_void:
       case vmIntrinsics::_StringBuffer_int:
       case vmIntrinsics::_StringBuffer_String:
       case vmIntrinsics::_StringBuffer_append_char:
       case vmIntrinsics::_StringBuffer_append_int:
       case vmIntrinsics::_StringBuffer_append_String:
       case vmIntrinsics::_StringBuffer_toString:
       case vmIntrinsics::_Integer_toString:
         return true;
       case vmIntrinsics::_String_String:
         {
           Node* receiver = jvms->map()->in(jvms->argoff() + 1);
           if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
             CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
             ciMethod* m = csj->method();
             if (m != NULL &&
                 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
                  m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
               // Delay String.<init>(new SB())
               return true;
           }
           return false;
         }
       default:
         return false;
     }
   }
   return false;
 }
 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
   // Additional inputs to consider...
   // bc      = bc()
   // caller  = method()
   // iter().get_method_holder_index()
   assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
   // Interface classes can be loaded & linked and never get around to
   // being initialized.  Uncommon-trap for not-initialized static or
   // v-calls.  Let interface calls happen.
   ciInstanceKlass* holder_klass = dest_method->holder();
   if (!holder_klass->is_being_initialized() &&
       !holder_klass->is_initialized() &&
       !holder_klass->is_interface()) {
     uncommon_trap(Deoptimization::Reason_uninitialized,
                   Deoptimization::Action_reinterpret,
                   holder_klass);
     return true;
   }
   assert(dest_method->is_loaded(), "dest_method: typeflow responsibility");
   return false;
 }
 //------------------------------do_call----------------------------------------
 // Handle your basic call.  Inline if we can & want to, else just setup call.
 void Parse::do_call() {
   // It's likely we are going to add debug info soon.
   // Also, if we inline a guy who eventually needs debug info for this JVMS,
   // our contribution to it is cleaned up right here.
   kill_dead_locals();
   // Set frequently used booleans
   const bool is_virtual = bc() == Bytecodes::_invokevirtual;
   const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
   const bool has_receiver = Bytecodes::has_receiver(bc());
   // Find target being called
   bool             will_link;
   ciSignature*     declared_signature = NULL;
   ciMethod*        orig_callee  = iter().get_method(will_link, &declared_signature);  // callee in the bytecode
   ciInstanceKlass* holder_klass = orig_callee->holder();
   ciKlass*         holder       = iter().get_declared_method_holder();
   ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
   assert(declared_signature != NULL, "cannot be null");
   // uncommon-trap when callee is unloaded, uninitialized or will not link
   // bailout when too many arguments for register representation
   if (!will_link || can_not_compile_call_site(orig_callee, klass)) {
 #ifndef PRODUCT
     if (PrintOpto && (Verbose || WizardMode)) {
       method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
       orig_callee->print_name(); tty->cr();
     }
 #endif
     return;
   }
   assert(holder_klass->is_loaded(), "");
   //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc");  // XXX invokehandle (cur_bc_raw)
   // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
   // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
   assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
   // Note:  In the absence of miranda methods, an abstract class K can perform
   // an invokevirtual directly on an interface method I.m if K implements I.
   // orig_callee is the resolved callee which's signature includes the
   // appendix argument.
   const int nargs = orig_callee->arg_size();
   const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id());
   // Push appendix argument (MethodType, CallSite, etc.), if one.
   if (iter().has_appendix()) {
     ciObject* appendix_arg = iter().get_appendix();
     const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg);
     Node* appendix_arg_node = _gvn.makecon(appendix_arg_type);
     push(appendix_arg_node);
   }
   // ---------------------
   // Does Class Hierarchy Analysis reveal only a single target of a v-call?
   // Then we may inline or make a static call, but become dependent on there being only 1 target.
   // Does the call-site type profile reveal only one receiver?
   // Then we may introduce a run-time check and inline on the path where it succeeds.
   // The other path may uncommon_trap, check for another receiver, or do a v-call.
   // Try to get the most accurate receiver type
   ciMethod* callee             = orig_callee;
   int       vtable_index       = Method::invalid_vtable_index;
   bool      call_does_dispatch = false;
   if (is_virtual_or_interface) {
     Node*             receiver_node = stack(sp() - nargs);
     const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
     // call_does_dispatch and vtable_index are out-parameters.  They might be changed.
     callee = C->optimize_virtual_call(method(), bci(), klass, orig_callee, receiver_type,
                                       is_virtual,
                                       call_does_dispatch, vtable_index);  // out-parameters
   }
   // Note:  It's OK to try to inline a virtual call.
   // The call generator will not attempt to inline a polymorphic call
   // unless it knows how to optimize the receiver dispatch.
   bool try_inline = (C->do_inlining() || InlineAccessors);
   // ---------------------
   dec_sp(nargs);              // Temporarily pop args for JVM state of call
   JVMState* jvms = sync_jvms();
   // ---------------------
   // Decide call tactic.
   // This call checks with CHA, the interpreter profile, intrinsics table, etc.
   // It decides whether inlining is desirable or not.
   CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor());
   // NOTE:  Don't use orig_callee and callee after this point!  Use cg->method() instead.
   orig_callee = callee = NULL;
   // ---------------------
   // Round double arguments before call
   round_double_arguments(cg->method());
 #ifndef PRODUCT
   // bump global counters for calls
   count_compiled_calls(/*at_method_entry*/ false, cg->is_inline());
   // Record first part of parsing work for this call
   parse_histogram()->record_change();
 #endif // not PRODUCT
   assert(jvms == this->jvms(), "still operating on the right JVMS");
   assert(jvms_in_sync(),       "jvms must carry full info into CG");
   // save across call, for a subsequent cast_not_null.
   Node* receiver = has_receiver ? argument(0) : NULL;
   // Bump method data counters (We profile *before* the call is made
   // because exceptions don't return to the call site.)
   profile_call(receiver);
   JVMState* new_jvms = cg->generate(jvms);
   if (new_jvms == NULL) {
     // When inlining attempt fails (e.g., too many arguments),
     // it may contaminate the current compile state, making it
     // impossible to pull back and try again.  Once we call
     // cg->generate(), we are committed.  If it fails, the whole
     // compilation task is compromised.
     if (failing())  return;
     // This can happen if a library intrinsic is available, but refuses
     // the call site, perhaps because it did not match a pattern the
     // intrinsic was expecting to optimize. Should always be possible to
     // get a normal java call that may inline in that case
     cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), /* allow_intrinsics= */ false);
     if ((new_jvms = cg->generate(jvms)) == NULL) {
       guarantee(failing(), "call failed to generate:  calls should work");
       return;
     }
   }
   if (cg->is_inline()) {
     // Accumulate has_loops estimate
     C->set_has_loops(C->has_loops() || cg->method()->has_loops());
     C->env()->notice_inlined_method(cg->method());
   }
   // Reset parser state from [new_]jvms, which now carries results of the call.
   // Return value (if any) is already pushed on the stack by the cg.
   add_exception_states_from(new_jvms);
   if (new_jvms->map()->control() == top()) {
     stop_and_kill_map();
   } else {
     assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
     set_jvms(new_jvms);
   }
   if (!stopped()) {
     // This was some sort of virtual call, which did a null check for us.
     // Now we can assert receiver-not-null, on the normal return path.
     if (receiver != NULL && cg->is_virtual()) {
       Node* cast = cast_not_null(receiver);
       // %%% assert(receiver == cast, "should already have cast the receiver");
     }
     // Round double result after a call from strict to non-strict code
     round_double_result(cg->method());
     ciType* rtype = cg->method()->return_type();
     ciType* ctype = declared_signature->return_type();
     if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) {
       // Be careful here with return types.
       if (ctype != rtype) {
         BasicType rt = rtype->basic_type();
         BasicType ct = ctype->basic_type();
         if (ct == T_VOID) {
           // It's OK for a method  to return a value that is discarded.
           // The discarding does not require any special action from the caller.
           // The Java code knows this, at VerifyType.isNullConversion.
           pop_node(rt);  // whatever it was, pop it
         } else if (rt == T_INT || is_subword_type(rt)) {
           // Nothing.  These cases are handled in lambda form bytecode.
           assert(ct == T_INT || is_subword_type(ct), err_msg_res("must match: rt=%s, ct=%s", type2name(rt), type2name(ct)));
         } else if (rt == T_OBJECT || rt == T_ARRAY) {
           assert(ct == T_OBJECT || ct == T_ARRAY, err_msg_res("rt=%s, ct=%s", type2name(rt), type2name(ct)));
           if (ctype->is_loaded()) {
             const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass());
             const Type*       sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
             if (arg_type != NULL && !arg_type->higher_equal(sig_type)) {
               Node* retnode = pop();
               Node* cast_obj = _gvn.transform(new (C) CheckCastPPNode(control(), retnode, sig_type));
               push(cast_obj);
             }
           }
         } else {
           assert(rt == ct, err_msg_res("unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct)));
           // push a zero; it's better than getting an oop/int mismatch
           pop_node(rt);
           Node* retnode = zerocon(ct);
           push_node(ct, retnode);
         }
         // Now that the value is well-behaved, continue with the call-site type.
         rtype = ctype;
       }
     } else {
       // Symbolic resolution enforces the types to be the same.
       // NOTE: We must relax the assert for unloaded types because two
       // different ciType instances of the same unloaded class type
       // can appear to be "loaded" by different loaders (depending on
       // the accessing class).
       assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype,
              err_msg_res("mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name()));
     }
     // If the return type of the method is not loaded, assert that the
     // value we got is a null.  Otherwise, we need to recompile.
     if (!rtype->is_loaded()) {
 #ifndef PRODUCT
       if (PrintOpto && (Verbose || WizardMode)) {
         method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
         cg->method()->print_name(); tty->cr();
       }
 #endif
       if (C->log() != NULL) {
         C->log()->elem("assert_null reason='return' klass='%d'",
                        C->log()->identify(rtype));
       }
       // If there is going to be a trap, put it at the next bytecode:
       set_bci(iter().next_bci());
       null_assert(peek());
       set_bci(iter().cur_bci()); // put it back
     }
   }
   // Restart record of parsing work after possible inlining of call
 #ifndef PRODUCT
   parse_histogram()->set_initial_state(bc());
 #endif
 }
 //---------------------------catch_call_exceptions-----------------------------
 // Put a Catch and CatchProj nodes behind a just-created call.
 // Send their caught exceptions to the proper handler.
 // This may be used after a call to the rethrow VM stub,
 // when it is needed to process unloaded exception classes.
 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
   // Exceptions are delivered through this channel:
   Node* i_o = this->i_o();
   // Add a CatchNode.
   GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
   GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
   GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
   for (; !handlers.is_done(); handlers.next()) {
     ciExceptionHandler* h        = handlers.handler();
     int                 h_bci    = h->handler_bci();
     ciInstanceKlass*    h_klass  = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
     // Do not introduce unloaded exception types into the graph:
     if (!h_klass->is_loaded()) {
       if (saw_unloaded->contains(h_bci)) {
         /* We've already seen an unloaded exception with h_bci,
            so don't duplicate. Duplication will cause the CatchNode to be
            unnecessarily large. See 4713716. */
         continue;
       } else {
         saw_unloaded->append(h_bci);
       }
     }
     const Type*         h_extype = TypeOopPtr::make_from_klass(h_klass);
     // (We use make_from_klass because it respects UseUniqueSubclasses.)
     h_extype = h_extype->join(TypeInstPtr::NOTNULL);
     assert(!h_extype->empty(), "sanity");
     // Note:  It's OK if the BCIs repeat themselves.
     bcis->append(h_bci);
     extypes->append(h_extype);
   }
   int len = bcis->length();
   CatchNode *cn = new (C) CatchNode(control(), i_o, len+1);
   Node *catch_ = _gvn.transform(cn);
   // now branch with the exception state to each of the (potential)
   // handlers
   for(int i=0; i < len; i++) {
     // Setup JVM state to enter the handler.
     PreserveJVMState pjvms(this);
     // Locals are just copied from before the call.
     // Get control from the CatchNode.
     int handler_bci = bcis->at(i);
     Node* ctrl = _gvn.transform( new (C) CatchProjNode(catch_, i+1,handler_bci));
     // This handler cannot happen?
     if (ctrl == top())  continue;
     set_control(ctrl);
     // Create exception oop
     const TypeInstPtr* extype = extypes->at(i)->is_instptr();
     Node *ex_oop = _gvn.transform(new (C) CreateExNode(extypes->at(i), ctrl, i_o));
     // Handle unloaded exception classes.
     if (saw_unloaded->contains(handler_bci)) {
       // An unloaded exception type is coming here.  Do an uncommon trap.
 #ifndef PRODUCT
       // We do not expect the same handler bci to take both cold unloaded
       // and hot loaded exceptions.  But, watch for it.
       if ((Verbose || WizardMode) && extype->is_loaded()) {
         tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci());
         method()->print_name(); tty->cr();
       } else if (PrintOpto && (Verbose || WizardMode)) {
         tty->print("Bailing out on unloaded exception type ");
         extype->klass()->print_name();
         tty->print(" at bci:%d in ", bci());
         method()->print_name(); tty->cr();
       }
 #endif
       // Emit an uncommon trap instead of processing the block.
       set_bci(handler_bci);
       push_ex_oop(ex_oop);
       uncommon_trap(Deoptimization::Reason_unloaded,
                     Deoptimization::Action_reinterpret,
                     extype->klass(), "!loaded exception");
       set_bci(iter().cur_bci()); // put it back
       continue;
     }
     // go to the exception handler
     if (handler_bci < 0) {     // merge with corresponding rethrow node
       throw_to_exit(make_exception_state(ex_oop));
     } else {                      // Else jump to corresponding handle
       push_ex_oop(ex_oop);        // Clear stack and push just the oop.
       merge_exception(handler_bci);
     }
   }
   // The first CatchProj is for the normal return.
   // (Note:  If this is a call to rethrow_Java, this node goes dead.)
   set_control(_gvn.transform( new (C) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
 }
 //----------------------------catch_inline_exceptions--------------------------
 // Handle all exceptions thrown by an inlined method or individual bytecode.
 // Common case 1: we have no handler, so all exceptions merge right into
 // the rethrow case.
 // Case 2: we have some handlers, with loaded exception klasses that have
 // no subklasses.  We do a Deutsch-Shiffman style type-check on the incoming
 // exception oop and branch to the handler directly.
 // Case 3: We have some handlers with subklasses or are not loaded at
 // compile-time.  We have to call the runtime to resolve the exception.
 // So we insert a RethrowCall and all the logic that goes with it.
 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
   // Caller is responsible for saving away the map for normal control flow!
   assert(stopped(), "call set_map(NULL) first");
   assert(method()->has_exception_handlers(), "don't come here w/o work to do");
   Node* ex_node = saved_ex_oop(ex_map);
   if (ex_node == top()) {
     // No action needed.
     return;
   }
   const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
   NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
   if (ex_type == NULL)
     ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
   // determine potential exception handlers
   ciExceptionHandlerStream handlers(method(), bci(),
                                     ex_type->klass()->as_instance_klass(),
                                     ex_type->klass_is_exact());
   // Start executing from the given throw state.  (Keep its stack, for now.)
   // Get the exception oop as known at compile time.
   ex_node = use_exception_state(ex_map);
   // Get the exception oop klass from its header
   Node* ex_klass_node = NULL;
   if (has_ex_handler() && !ex_type->klass_is_exact()) {
     Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
     ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
     // Compute the exception klass a little more cleverly.
     // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
     // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
     // each arm of the Phi.  If I know something clever about the exceptions
     // I'm loading the class from, I can replace the LoadKlass with the
     // klass constant for the exception oop.
     if( ex_node->is_Phi() ) {
       ex_klass_node = new (C) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT );
       for( uint i = 1; i < ex_node->req(); i++ ) {
         Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() );
         Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
         ex_klass_node->init_req( i, k );
       }
       _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
     }
   }
   // Scan the exception table for applicable handlers.
   // If none, we can call rethrow() and be done!
   // If precise (loaded with no subklasses), insert a D.S. style
   // pointer compare to the correct handler and loop back.
   // If imprecise, switch to the Rethrow VM-call style handling.
   int remaining = handlers.count_remaining();
   // iterate through all entries sequentially
   for (;!handlers.is_done(); handlers.next()) {
     ciExceptionHandler* handler = handlers.handler();
     if (handler->is_rethrow()) {
       // If we fell off the end of the table without finding an imprecise
       // exception klass (and without finding a generic handler) then we
       // know this exception is not handled in this method.  We just rethrow
       // the exception into the caller.
       throw_to_exit(make_exception_state(ex_node));
       return;
     }
     // exception handler bci range covers throw_bci => investigate further
     int handler_bci = handler->handler_bci();
     if (remaining == 1) {
       push_ex_oop(ex_node);        // Push exception oop for handler
 #ifndef PRODUCT
       if (PrintOpto && WizardMode) {
         tty->print_cr("  Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
       }
 #endif
       merge_exception(handler_bci); // jump to handler
       return;                   // No more handling to be done here!
     }
     // Get the handler's klass
     ciInstanceKlass* klass = handler->catch_klass();
     if (!klass->is_loaded()) {  // klass is not loaded?
       // fall through into catch_call_exceptions which will emit a
       // handler with an uncommon trap.
       break;
     }
     if (klass->is_interface())  // should not happen, but...
       break;                    // bail out
     // Check the type of the exception against the catch type
     const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
     Node* con = _gvn.makecon(tk);
     Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
     if (!stopped()) {
       PreserveJVMState pjvms(this);
       const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
       assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
       Node* ex_oop = _gvn.transform(new (C) CheckCastPPNode(control(), ex_node, tinst));
       push_ex_oop(ex_oop);      // Push exception oop for handler
 #ifndef PRODUCT
       if (PrintOpto && WizardMode) {
         tty->print("  Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
         klass->print_name();
         tty->cr();
       }
 #endif
       merge_exception(handler_bci);
     }
     set_control(not_subtype_ctrl);
     // Come here if exception does not match handler.
     // Carry on with more handler checks.
     --remaining;
   }
   assert(!stopped(), "you should return if you finish the chain");
   // Oops, need to call into the VM to resolve the klasses at runtime.
   // Note:  This call must not deoptimize, since it is not a real at this bci!
   kill_dead_locals();
   make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
                     OptoRuntime::rethrow_Type(),
                     OptoRuntime::rethrow_stub(),
                     NULL, NULL,
                     ex_node);
   // Rethrow is a pure call, no side effects, only a result.
   // The result cannot be allocated, so we use I_O
   // Catch exceptions from the rethrow
   catch_call_exceptions(handlers);
 }
 // (Note:  Moved add_debug_info into GraphKit::add_safepoint_edges.)
 #ifndef PRODUCT
 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
   if( CountCompiledCalls ) {
     if( at_method_entry ) {
       // bump invocation counter if top method (for statistics)
       if (CountCompiledCalls && depth() == 1) {
         const TypePtr* addr_type = TypeMetadataPtr::make(method());
         Node* adr1 = makecon(addr_type);
         Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset()));
         increment_counter(adr2);
       }
     } else if (is_inline) {
       switch (bc()) {
       case Bytecodes::_invokevirtual:   increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
       case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
       case Bytecodes::_invokestatic:
       case Bytecodes::_invokedynamic:
       case Bytecodes::_invokespecial:   increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
       default: fatal("unexpected call bytecode");
       }
     } else {
       switch (bc()) {
       case Bytecodes::_invokevirtual:   increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
       case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
       case Bytecodes::_invokestatic:
       case Bytecodes::_invokedynamic:
       case Bytecodes::_invokespecial:   increment_counter(SharedRuntime::nof_static_calls_addr()); break;
       default: fatal("unexpected call bytecode");
       }
     }
   }
 }
 #endif //PRODUCT
 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, int bci, ciInstanceKlass* klass,
                                          ciMethod* callee, const TypeOopPtr* receiver_type,
                                          bool is_virtual,
                                          bool& call_does_dispatch, int& vtable_index) {
   // Set default values for out-parameters.
   call_does_dispatch = true;
   vtable_index       = Method::invalid_vtable_index;
   // Choose call strategy.
   ciMethod* optimized_virtual_method = optimize_inlining(caller, bci, klass, callee, receiver_type);
   // Have the call been sufficiently improved such that it is no longer a virtual?
   if (optimized_virtual_method != NULL) {
     callee             = optimized_virtual_method;
     call_does_dispatch = false;
   } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) {
     // We can make a vtable call at this site
     vtable_index = callee->resolve_vtable_index(caller->holder(), klass);
   }
   return callee;
 }
 // Identify possible target method and inlining style
 ciMethod* Compile::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
                                      ciMethod* callee, const TypeOopPtr* receiver_type) {
   // only use for virtual or interface calls
   // If it is obviously final, do not bother to call find_monomorphic_target,
   // because the class hierarchy checks are not needed, and may fail due to
   // incompletely loaded classes.  Since we do our own class loading checks
   // in this module, we may confidently bind to any method.
   if (callee->can_be_statically_bound()) {
     return callee;
   }
   // Attempt to improve the receiver
   bool actual_receiver_is_exact = false;
   ciInstanceKlass* actual_receiver = klass;
   if (receiver_type != NULL) {
     // Array methods are all inherited from Object, and are monomorphic.
     if (receiver_type->isa_aryptr() &&
         callee->holder() == env()->Object_klass()) {
       return callee;
     }
     // All other interesting cases are instance klasses.
     if (!receiver_type->isa_instptr()) {
       return NULL;
     }
     ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
     if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
         (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
       // ikl is a same or better type than the original actual_receiver,
       // e.g. static receiver from bytecodes.
       actual_receiver = ikl;
       // Is the actual_receiver exact?
       actual_receiver_is_exact = receiver_type->klass_is_exact();
     }
   }
   ciInstanceKlass*   calling_klass = caller->holder();
   ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver);
   if (cha_monomorphic_target != NULL) {
     assert(!cha_monomorphic_target->is_abstract(), "");
     // Look at the method-receiver type.  Does it add "too much information"?
     ciKlass*    mr_klass = cha_monomorphic_target->holder();
     const Type* mr_type  = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
     if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
       // Calling this method would include an implicit cast to its holder.
       // %%% Not yet implemented.  Would throw minor asserts at present.
       // %%% The most common wins are already gained by +UseUniqueSubclasses.
       // To fix, put the higher_equal check at the call of this routine,
       // and add a CheckCastPP to the receiver.
       if (TraceDependencies) {
         tty->print_cr("found unique CHA method, but could not cast up");
         tty->print("  method  = ");
         cha_monomorphic_target->print();
         tty->cr();
       }
       if (log() != NULL) {
         log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
                        log()->identify(klass),
                        log()->identify(cha_monomorphic_target));
       }
       cha_monomorphic_target = NULL;
     }
   }
   if (cha_monomorphic_target != NULL) {
     // Hardwiring a virtual.
     // If we inlined because CHA revealed only a single target method,
     // then we are dependent on that target method not getting overridden
     // by dynamic class loading.  Be sure to test the "static" receiver
     // dest_method here, as opposed to the actual receiver, which may
     // falsely lead us to believe that the receiver is final or private.
     dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
     return cha_monomorphic_target;
   }
   // If the type is exact, we can still bind the method w/o a vcall.
   // (This case comes after CHA so we can see how much extra work it does.)
   if (actual_receiver_is_exact) {
     // In case of evolution, there is a dependence on every inlined method, since each
     // such method can be changed when its class is redefined.
     ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver);
     if (exact_method != NULL) {
 #ifndef PRODUCT
       if (PrintOpto) {
         tty->print("  Calling method via exact type @%d --- ", bci);
         exact_method->print_name();
         tty->cr();
       }
 #endif
       return exact_method;
     }
   }
   return NULL;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/doCall.cpp@96ef09c26978 (annotated)

src/share/vm/opto/doCall.cpp