jdk8-mips64-public/hotspot: src/share/vm/opto/callGenerator.cpp@1bd45abaa507 (annotated)

src/share/vm/opto/callGenerator.cpp@1bd45abaa507 (annotated)

src/share/vm/opto/callGenerator.cpp

Wed, 16 Nov 2011 09:13:57 -0800

author: kvn
date: Wed, 16 Nov 2011 09:13:57 -0800
changeset 3311: 1bd45abaa507
parent 3258: 83d0b5cd1438
child 3313: a04a201f0f5a
permissions: -rw-r--r--

6890673: Eliminate allocations immediately after EA
Summary: Try to eliminate allocations and related locks immediately after escape analysis.
Reviewed-by: never

 /*
  * Copyright (c) 2000, 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 "ci/bcEscapeAnalyzer.hpp"
 #include "ci/ciCallSite.hpp"
 #include "ci/ciCPCache.hpp"
 #include "ci/ciMethodHandle.hpp"
 #include "classfile/javaClasses.hpp"
 #include "compiler/compileLog.hpp"
 #include "opto/addnode.hpp"
 #include "opto/callGenerator.hpp"
 #include "opto/callnode.hpp"
 #include "opto/cfgnode.hpp"
 #include "opto/connode.hpp"
 #include "opto/parse.hpp"
 #include "opto/rootnode.hpp"
 #include "opto/runtime.hpp"
 #include "opto/subnode.hpp"
 CallGenerator::CallGenerator(ciMethod* method) {
   _method = method;
 }
 // Utility function.
 const TypeFunc* CallGenerator::tf() const {
   return TypeFunc::make(method());
 }
 //-----------------------------ParseGenerator---------------------------------
 // Internal class which handles all direct bytecode traversal.
 class ParseGenerator : public InlineCallGenerator {
 private:
   bool  _is_osr;
   float _expected_uses;
 public:
   ParseGenerator(ciMethod* method, float expected_uses, bool is_osr = false)
     : InlineCallGenerator(method)
   {
     _is_osr        = is_osr;
     _expected_uses = expected_uses;
     assert(InlineTree::check_can_parse(method) == NULL, "parse must be possible");
   }
   virtual bool      is_parse() const           { return true; }
   virtual JVMState* generate(JVMState* jvms);
   int is_osr() { return _is_osr; }
 };
 JVMState* ParseGenerator::generate(JVMState* jvms) {
   Compile* C = Compile::current();
   if (is_osr()) {
     // The JVMS for a OSR has a single argument (see its TypeFunc).
     assert(jvms->depth() == 1, "no inline OSR");
   }
   if (C->failing()) {
     return NULL;  // bailing out of the compile; do not try to parse
   }
   Parse parser(jvms, method(), _expected_uses);
   // Grab signature for matching/allocation
 #ifdef ASSERT
   if (parser.tf() != (parser.depth() == 1 ? C->tf() : tf())) {
     MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag);
     assert(C->env()->system_dictionary_modification_counter_changed(),
            "Must invalidate if TypeFuncs differ");
   }
 #endif
   GraphKit& exits = parser.exits();
   if (C->failing()) {
     while (exits.pop_exception_state() != NULL) ;
     return NULL;
   }
   assert(exits.jvms()->same_calls_as(jvms), "sanity");
   // Simply return the exit state of the parser,
   // augmented by any exceptional states.
   return exits.transfer_exceptions_into_jvms();
 }
 //---------------------------DirectCallGenerator------------------------------
 // Internal class which handles all out-of-line calls w/o receiver type checks.
 class DirectCallGenerator : public CallGenerator {
  private:
   CallStaticJavaNode* _call_node;
   // Force separate memory and I/O projections for the exceptional
   // paths to facilitate late inlinig.
   bool                _separate_io_proj;
  public:
   DirectCallGenerator(ciMethod* method, bool separate_io_proj)
     : CallGenerator(method),
       _separate_io_proj(separate_io_proj)
   {
   }
   virtual JVMState* generate(JVMState* jvms);
   CallStaticJavaNode* call_node() const { return _call_node; }
 };
 JVMState* DirectCallGenerator::generate(JVMState* jvms) {
   GraphKit kit(jvms);
   bool is_static = method()->is_static();
   address target = is_static ? SharedRuntime::get_resolve_static_call_stub()
                              : SharedRuntime::get_resolve_opt_virtual_call_stub();
   if (kit.C->log() != NULL) {
     kit.C->log()->elem("direct_call bci='%d'", jvms->bci());
   }
   CallStaticJavaNode *call = new (kit.C, tf()->domain()->cnt()) CallStaticJavaNode(tf(), target, method(), kit.bci());
   if (!is_static) {
     // Make an explicit receiver null_check as part of this call.
     // Since we share a map with the caller, his JVMS gets adjusted.
     kit.null_check_receiver(method());
     if (kit.stopped()) {
       // And dump it back to the caller, decorated with any exceptions:
       return kit.transfer_exceptions_into_jvms();
     }
     // Mark the call node as virtual, sort of:
     call->set_optimized_virtual(true);
     if (method()->is_method_handle_invoke()) {
       call->set_method_handle_invoke(true);
     }
   }
   kit.set_arguments_for_java_call(call);
   kit.set_edges_for_java_call(call, false, _separate_io_proj);
   Node* ret = kit.set_results_for_java_call(call, _separate_io_proj);
   kit.push_node(method()->return_type()->basic_type(), ret);
   _call_node = call;  // Save the call node in case we need it later
   return kit.transfer_exceptions_into_jvms();
 }
 //---------------------------DynamicCallGenerator-----------------------------
 // Internal class which handles all out-of-line invokedynamic calls.
 class DynamicCallGenerator : public CallGenerator {
 public:
   DynamicCallGenerator(ciMethod* method)
     : CallGenerator(method)
   {
   }
   virtual JVMState* generate(JVMState* jvms);
 };
 JVMState* DynamicCallGenerator::generate(JVMState* jvms) {
   GraphKit kit(jvms);
   if (kit.C->log() != NULL) {
     kit.C->log()->elem("dynamic_call bci='%d'", jvms->bci());
   }
   // Get the constant pool cache from the caller class.
   ciMethod* caller_method = jvms->method();
   ciBytecodeStream str(caller_method);
   str.force_bci(jvms->bci());  // Set the stream to the invokedynamic bci.
   assert(str.cur_bc() == Bytecodes::_invokedynamic, "wrong place to issue a dynamic call!");
   ciCPCache* cpcache = str.get_cpcache();
   // Get the offset of the CallSite from the constant pool cache
   // pointer.
   int index = str.get_method_index();
   size_t call_site_offset = cpcache->get_f1_offset(index);
   // Load the CallSite object from the constant pool cache.
   const TypeOopPtr* cpcache_ptr = TypeOopPtr::make_from_constant(cpcache);
   Node* cpcache_adr = kit.makecon(cpcache_ptr);
   Node* call_site_adr = kit.basic_plus_adr(cpcache_adr, cpcache_adr, call_site_offset);
   Node* call_site = kit.make_load(kit.control(), call_site_adr, TypeInstPtr::BOTTOM, T_OBJECT, Compile::AliasIdxRaw);
   // Load the target MethodHandle from the CallSite object.
   Node* target_mh_adr = kit.basic_plus_adr(call_site, call_site, java_lang_invoke_CallSite::target_offset_in_bytes());
   Node* target_mh = kit.make_load(kit.control(), target_mh_adr, TypeInstPtr::BOTTOM, T_OBJECT);
   address resolve_stub = SharedRuntime::get_resolve_opt_virtual_call_stub();
   CallStaticJavaNode *call = new (kit.C, tf()->domain()->cnt()) CallStaticJavaNode(tf(), resolve_stub, method(), kit.bci());
   // invokedynamic is treated as an optimized invokevirtual.
   call->set_optimized_virtual(true);
   // Take extra care (in the presence of argument motion) not to trash the SP:
   call->set_method_handle_invoke(true);
   // Pass the target MethodHandle as first argument and shift the
   // other arguments.
   call->init_req(0 + TypeFunc::Parms, target_mh);
   uint nargs = call->method()->arg_size();
   for (uint i = 1; i < nargs; i++) {
     Node* arg = kit.argument(i - 1);
     call->init_req(i + TypeFunc::Parms, arg);
   }
   kit.set_edges_for_java_call(call);
   Node* ret = kit.set_results_for_java_call(call);
   kit.push_node(method()->return_type()->basic_type(), ret);
   return kit.transfer_exceptions_into_jvms();
 }
 //--------------------------VirtualCallGenerator------------------------------
 // Internal class which handles all out-of-line calls checking receiver type.
 class VirtualCallGenerator : public CallGenerator {
 private:
   int _vtable_index;
 public:
   VirtualCallGenerator(ciMethod* method, int vtable_index)
     : CallGenerator(method), _vtable_index(vtable_index)
   {
     assert(vtable_index == methodOopDesc::invalid_vtable_index ||
            vtable_index >= 0, "either invalid or usable");
   }
   virtual bool      is_virtual() const          { return true; }
   virtual JVMState* generate(JVMState* jvms);
 };
 JVMState* VirtualCallGenerator::generate(JVMState* jvms) {
   GraphKit kit(jvms);
   Node* receiver = kit.argument(0);
   if (kit.C->log() != NULL) {
     kit.C->log()->elem("virtual_call bci='%d'", jvms->bci());
   }
   // If the receiver is a constant null, do not torture the system
   // by attempting to call through it.  The compile will proceed
   // correctly, but may bail out in final_graph_reshaping, because
   // the call instruction will have a seemingly deficient out-count.
   // (The bailout says something misleading about an "infinite loop".)
   if (kit.gvn().type(receiver)->higher_equal(TypePtr::NULL_PTR)) {
     kit.inc_sp(method()->arg_size());  // restore arguments
     kit.uncommon_trap(Deoptimization::Reason_null_check,
                       Deoptimization::Action_none,
                       NULL, "null receiver");
     return kit.transfer_exceptions_into_jvms();
   }
   // Ideally we would unconditionally do a null check here and let it
   // be converted to an implicit check based on profile information.
   // However currently the conversion to implicit null checks in
   // Block::implicit_null_check() only looks for loads and stores, not calls.
   ciMethod *caller = kit.method();
   ciMethodData *caller_md = (caller == NULL) ? NULL : caller->method_data();
   if (!UseInlineCaches || !ImplicitNullChecks ||
        ((ImplicitNullCheckThreshold > 0) && caller_md &&
        (caller_md->trap_count(Deoptimization::Reason_null_check)
        >= (uint)ImplicitNullCheckThreshold))) {
     // Make an explicit receiver null_check as part of this call.
     // Since we share a map with the caller, his JVMS gets adjusted.
     receiver = kit.null_check_receiver(method());
     if (kit.stopped()) {
       // And dump it back to the caller, decorated with any exceptions:
       return kit.transfer_exceptions_into_jvms();
     }
   }
   assert(!method()->is_static(), "virtual call must not be to static");
   assert(!method()->is_final(), "virtual call should not be to final");
   assert(!method()->is_private(), "virtual call should not be to private");
   assert(_vtable_index == methodOopDesc::invalid_vtable_index || !UseInlineCaches,
          "no vtable calls if +UseInlineCaches ");
   address target = SharedRuntime::get_resolve_virtual_call_stub();
   // Normal inline cache used for call
   CallDynamicJavaNode *call = new (kit.C, tf()->domain()->cnt()) CallDynamicJavaNode(tf(), target, method(), _vtable_index, kit.bci());
   kit.set_arguments_for_java_call(call);
   kit.set_edges_for_java_call(call);
   Node* ret = kit.set_results_for_java_call(call);
   kit.push_node(method()->return_type()->basic_type(), ret);
   // Represent the effect of an implicit receiver null_check
   // as part of this call.  Since we share a map with the caller,
   // his JVMS gets adjusted.
   kit.cast_not_null(receiver);
   return kit.transfer_exceptions_into_jvms();
 }
 CallGenerator* CallGenerator::for_inline(ciMethod* m, float expected_uses) {
   if (InlineTree::check_can_parse(m) != NULL)  return NULL;
   return new ParseGenerator(m, expected_uses);
 }
 // As a special case, the JVMS passed to this CallGenerator is
 // for the method execution already in progress, not just the JVMS
 // of the caller.  Thus, this CallGenerator cannot be mixed with others!
 CallGenerator* CallGenerator::for_osr(ciMethod* m, int osr_bci) {
   if (InlineTree::check_can_parse(m) != NULL)  return NULL;
   float past_uses = m->interpreter_invocation_count();
   float expected_uses = past_uses;
   return new ParseGenerator(m, expected_uses, true);
 }
 CallGenerator* CallGenerator::for_direct_call(ciMethod* m, bool separate_io_proj) {
   assert(!m->is_abstract(), "for_direct_call mismatch");
   return new DirectCallGenerator(m, separate_io_proj);
 }
 CallGenerator* CallGenerator::for_dynamic_call(ciMethod* m) {
   assert(m->is_method_handle_invoke() || m->is_method_handle_adapter(), "for_dynamic_call mismatch");
   return new DynamicCallGenerator(m);
 }
 CallGenerator* CallGenerator::for_virtual_call(ciMethod* m, int vtable_index) {
   assert(!m->is_static(), "for_virtual_call mismatch");
   assert(!m->is_method_handle_invoke(), "should be a direct call");
   return new VirtualCallGenerator(m, vtable_index);
 }
 // Allow inlining decisions to be delayed
 class LateInlineCallGenerator : public DirectCallGenerator {
   CallGenerator* _inline_cg;
  public:
   LateInlineCallGenerator(ciMethod* method, CallGenerator* inline_cg) :
     DirectCallGenerator(method, true), _inline_cg(inline_cg) {}
   virtual bool      is_late_inline() const { return true; }
   // Convert the CallStaticJava into an inline
   virtual void do_late_inline();
   JVMState* generate(JVMState* jvms) {
     // Record that this call site should be revisited once the main
     // parse is finished.
     Compile::current()->add_late_inline(this);
     // Emit the CallStaticJava and request separate projections so
     // that the late inlining logic can distinguish between fall
     // through and exceptional uses of the memory and io projections
     // as is done for allocations and macro expansion.
     return DirectCallGenerator::generate(jvms);
   }
 };
 void LateInlineCallGenerator::do_late_inline() {
   // Can't inline it
   if (call_node() == NULL || call_node()->outcnt() == 0 ||
       call_node()->in(0) == NULL || call_node()->in(0)->is_top())
     return;
   CallStaticJavaNode* call = call_node();
   // Make a clone of the JVMState that appropriate to use for driving a parse
   Compile* C = Compile::current();
   JVMState* jvms     = call->jvms()->clone_shallow(C);
   uint size = call->req();
   SafePointNode* map = new (C, size) SafePointNode(size, jvms);
   for (uint i1 = 0; i1 < size; i1++) {
     map->init_req(i1, call->in(i1));
   }
   // Make sure the state is a MergeMem for parsing.
   if (!map->in(TypeFunc::Memory)->is_MergeMem()) {
     map->set_req(TypeFunc::Memory, MergeMemNode::make(C, map->in(TypeFunc::Memory)));
   }
   // Make enough space for the expression stack and transfer the incoming arguments
   int nargs    = method()->arg_size();
   jvms->set_map(map);
   map->ensure_stack(jvms, jvms->method()->max_stack());
   if (nargs > 0) {
     for (int i1 = 0; i1 < nargs; i1++) {
       map->set_req(i1 + jvms->argoff(), call->in(TypeFunc::Parms + i1));
     }
   }
   CompileLog* log = C->log();
   if (log != NULL) {
     log->head("late_inline method='%d'", log->identify(method()));
     JVMState* p = jvms;
     while (p != NULL) {
       log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
       p = p->caller();
     }
     log->tail("late_inline");
   }
   // Setup default node notes to be picked up by the inlining
   Node_Notes* old_nn = C->default_node_notes();
   if (old_nn != NULL) {
     Node_Notes* entry_nn = old_nn->clone(C);
     entry_nn->set_jvms(jvms);
     C->set_default_node_notes(entry_nn);
   }
   // Now perform the inling using the synthesized JVMState
   JVMState* new_jvms = _inline_cg->generate(jvms);
   if (new_jvms == NULL)  return;  // no change
   if (C->failing())      return;
   // Capture any exceptional control flow
   GraphKit kit(new_jvms);
   // Find the result object
   Node* result = C->top();
   int   result_size = method()->return_type()->size();
   if (result_size != 0 && !kit.stopped()) {
     result = (result_size == 1) ? kit.pop() : kit.pop_pair();
   }
   kit.replace_call(call, result);
 }
 CallGenerator* CallGenerator::for_late_inline(ciMethod* method, CallGenerator* inline_cg) {
   return new LateInlineCallGenerator(method, inline_cg);
 }
 //---------------------------WarmCallGenerator--------------------------------
 // Internal class which handles initial deferral of inlining decisions.
 class WarmCallGenerator : public CallGenerator {
   WarmCallInfo*   _call_info;
   CallGenerator*  _if_cold;
   CallGenerator*  _if_hot;
   bool            _is_virtual;   // caches virtuality of if_cold
   bool            _is_inline;    // caches inline-ness of if_hot
 public:
   WarmCallGenerator(WarmCallInfo* ci,
                     CallGenerator* if_cold,
                     CallGenerator* if_hot)
     : CallGenerator(if_cold->method())
   {
     assert(method() == if_hot->method(), "consistent choices");
     _call_info  = ci;
     _if_cold    = if_cold;
     _if_hot     = if_hot;
     _is_virtual = if_cold->is_virtual();
     _is_inline  = if_hot->is_inline();
   }
   virtual bool      is_inline() const           { return _is_inline; }
   virtual bool      is_virtual() const          { return _is_virtual; }
   virtual bool      is_deferred() const         { return true; }
   virtual JVMState* generate(JVMState* jvms);
 };
 CallGenerator* CallGenerator::for_warm_call(WarmCallInfo* ci,
                                             CallGenerator* if_cold,
                                             CallGenerator* if_hot) {
   return new WarmCallGenerator(ci, if_cold, if_hot);
 }
 JVMState* WarmCallGenerator::generate(JVMState* jvms) {
   Compile* C = Compile::current();
   if (C->log() != NULL) {
     C->log()->elem("warm_call bci='%d'", jvms->bci());
   }
   jvms = _if_cold->generate(jvms);
   if (jvms != NULL) {
     Node* m = jvms->map()->control();
     if (m->is_CatchProj()) m = m->in(0);  else m = C->top();
     if (m->is_Catch())     m = m->in(0);  else m = C->top();
     if (m->is_Proj())      m = m->in(0);  else m = C->top();
     if (m->is_CallJava()) {
       _call_info->set_call(m->as_Call());
       _call_info->set_hot_cg(_if_hot);
 #ifndef PRODUCT
       if (PrintOpto || PrintOptoInlining) {
         tty->print_cr("Queueing for warm inlining at bci %d:", jvms->bci());
         tty->print("WCI: ");
         _call_info->print();
       }
 #endif
       _call_info->set_heat(_call_info->compute_heat());
       C->set_warm_calls(_call_info->insert_into(C->warm_calls()));
     }
   }
   return jvms;
 }
 void WarmCallInfo::make_hot() {
   Unimplemented();
 }
 void WarmCallInfo::make_cold() {
   // No action:  Just dequeue.
 }
 //------------------------PredictedCallGenerator------------------------------
 // Internal class which handles all out-of-line calls checking receiver type.
 class PredictedCallGenerator : public CallGenerator {
   ciKlass*       _predicted_receiver;
   CallGenerator* _if_missed;
   CallGenerator* _if_hit;
   float          _hit_prob;
 public:
   PredictedCallGenerator(ciKlass* predicted_receiver,
                          CallGenerator* if_missed,
                          CallGenerator* if_hit, float hit_prob)
     : CallGenerator(if_missed->method())
   {
     // The call profile data may predict the hit_prob as extreme as 0 or 1.
     // Remove the extremes values from the range.
     if (hit_prob > PROB_MAX)   hit_prob = PROB_MAX;
     if (hit_prob < PROB_MIN)   hit_prob = PROB_MIN;
     _predicted_receiver = predicted_receiver;
     _if_missed          = if_missed;
     _if_hit             = if_hit;
     _hit_prob           = hit_prob;
   }
   virtual bool      is_virtual()   const    { return true; }
   virtual bool      is_inline()    const    { return _if_hit->is_inline(); }
   virtual bool      is_deferred()  const    { return _if_hit->is_deferred(); }
   virtual JVMState* generate(JVMState* jvms);
 };
 CallGenerator* CallGenerator::for_predicted_call(ciKlass* predicted_receiver,
                                                  CallGenerator* if_missed,
                                                  CallGenerator* if_hit,
                                                  float hit_prob) {
   return new PredictedCallGenerator(predicted_receiver, if_missed, if_hit, hit_prob);
 }
 JVMState* PredictedCallGenerator::generate(JVMState* jvms) {
   GraphKit kit(jvms);
   PhaseGVN& gvn = kit.gvn();
   // We need an explicit receiver null_check before checking its type.
   // We share a map with the caller, so his JVMS gets adjusted.
   Node* receiver = kit.argument(0);
   CompileLog* log = kit.C->log();
   if (log != NULL) {
     log->elem("predicted_call bci='%d' klass='%d'",
               jvms->bci(), log->identify(_predicted_receiver));
   }
   receiver = kit.null_check_receiver(method());
   if (kit.stopped()) {
     return kit.transfer_exceptions_into_jvms();
   }
   Node* exact_receiver = receiver;  // will get updated in place...
   Node* slow_ctl = kit.type_check_receiver(receiver,
                                            _predicted_receiver, _hit_prob,
                                            &exact_receiver);
   SafePointNode* slow_map = NULL;
   JVMState* slow_jvms;
   { PreserveJVMState pjvms(&kit);
     kit.set_control(slow_ctl);
     if (!kit.stopped()) {
       slow_jvms = _if_missed->generate(kit.sync_jvms());
       assert(slow_jvms != NULL, "miss path must not fail to generate");
       kit.add_exception_states_from(slow_jvms);
       kit.set_map(slow_jvms->map());
       if (!kit.stopped())
         slow_map = kit.stop();
     }
   }
   if (kit.stopped()) {
     // Instance exactly does not matches the desired type.
     kit.set_jvms(slow_jvms);
     return kit.transfer_exceptions_into_jvms();
   }
   // fall through if the instance exactly matches the desired type
   kit.replace_in_map(receiver, exact_receiver);
   // Make the hot call:
   JVMState* new_jvms = _if_hit->generate(kit.sync_jvms());
   if (new_jvms == NULL) {
     // Inline failed, so make a direct call.
     assert(_if_hit->is_inline(), "must have been a failed inline");
     CallGenerator* cg = CallGenerator::for_direct_call(_if_hit->method());
     new_jvms = cg->generate(kit.sync_jvms());
   }
   kit.add_exception_states_from(new_jvms);
   kit.set_jvms(new_jvms);
   // Need to merge slow and fast?
   if (slow_map == NULL) {
     // The fast path is the only path remaining.
     return kit.transfer_exceptions_into_jvms();
   }
   if (kit.stopped()) {
     // Inlined method threw an exception, so it's just the slow path after all.
     kit.set_jvms(slow_jvms);
     return kit.transfer_exceptions_into_jvms();
   }
   // Finish the diamond.
   kit.C->set_has_split_ifs(true); // Has chance for split-if optimization
   RegionNode* region = new (kit.C, 3) RegionNode(3);
   region->init_req(1, kit.control());
   region->init_req(2, slow_map->control());
   kit.set_control(gvn.transform(region));
   Node* iophi = PhiNode::make(region, kit.i_o(), Type::ABIO);
   iophi->set_req(2, slow_map->i_o());
   kit.set_i_o(gvn.transform(iophi));
   kit.merge_memory(slow_map->merged_memory(), region, 2);
   uint tos = kit.jvms()->stkoff() + kit.sp();
   uint limit = slow_map->req();
   for (uint i = TypeFunc::Parms; i < limit; i++) {
     // Skip unused stack slots; fast forward to monoff();
     if (i == tos) {
       i = kit.jvms()->monoff();
       if( i >= limit ) break;
     }
     Node* m = kit.map()->in(i);
     Node* n = slow_map->in(i);
     if (m != n) {
       const Type* t = gvn.type(m)->meet(gvn.type(n));
       Node* phi = PhiNode::make(region, m, t);
       phi->set_req(2, n);
       kit.map()->set_req(i, gvn.transform(phi));
     }
   }
   return kit.transfer_exceptions_into_jvms();
 }
 //------------------------PredictedDynamicCallGenerator-----------------------
 // Internal class which handles all out-of-line calls checking receiver type.
 class PredictedDynamicCallGenerator : public CallGenerator {
   ciMethodHandle* _predicted_method_handle;
   CallGenerator*  _if_missed;
   CallGenerator*  _if_hit;
   float           _hit_prob;
 public:
   PredictedDynamicCallGenerator(ciMethodHandle* predicted_method_handle,
                                 CallGenerator* if_missed,
                                 CallGenerator* if_hit,
                                 float hit_prob)
     : CallGenerator(if_missed->method()),
       _predicted_method_handle(predicted_method_handle),
       _if_missed(if_missed),
       _if_hit(if_hit),
       _hit_prob(hit_prob)
   {}
   virtual bool is_inline()   const { return _if_hit->is_inline(); }
   virtual bool is_deferred() const { return _if_hit->is_deferred(); }
   virtual JVMState* generate(JVMState* jvms);
 };
 CallGenerator* CallGenerator::for_predicted_dynamic_call(ciMethodHandle* predicted_method_handle,
                                                          CallGenerator* if_missed,
                                                          CallGenerator* if_hit,
                                                          float hit_prob) {
   return new PredictedDynamicCallGenerator(predicted_method_handle, if_missed, if_hit, hit_prob);
 }
 CallGenerator* CallGenerator::for_method_handle_inline(Node* method_handle, JVMState* jvms,
                                                        ciMethod* caller, ciMethod* callee, ciCallProfile profile) {
   if (method_handle->Opcode() == Op_ConP) {
     const TypeOopPtr* oop_ptr = method_handle->bottom_type()->is_oopptr();
     ciObject* const_oop = oop_ptr->const_oop();
     ciMethodHandle* method_handle = const_oop->as_method_handle();
     // Set the callee to have access to the class and signature in
     // the MethodHandleCompiler.
     method_handle->set_callee(callee);
     method_handle->set_caller(caller);
     method_handle->set_call_profile(profile);
     // Get an adapter for the MethodHandle.
     ciMethod* target_method = method_handle->get_method_handle_adapter();
     if (target_method != NULL) {
       CallGenerator* cg = Compile::current()->call_generator(target_method, -1, false, jvms, true, PROB_ALWAYS);
       if (cg != NULL && cg->is_inline())
         return cg;
     }
   } else if (method_handle->Opcode() == Op_Phi && method_handle->req() == 3 &&
              method_handle->in(1)->Opcode() == Op_ConP && method_handle->in(2)->Opcode() == Op_ConP) {
     float prob = PROB_FAIR;
     Node* meth_region = method_handle->in(0);
     if (meth_region->is_Region() &&
         meth_region->in(1)->is_Proj() && meth_region->in(2)->is_Proj() &&
         meth_region->in(1)->in(0) == meth_region->in(2)->in(0) &&
         meth_region->in(1)->in(0)->is_If()) {
       // If diamond, so grab the probability of the test to drive the inlining below
       prob = meth_region->in(1)->in(0)->as_If()->_prob;
       if (meth_region->in(1)->is_IfTrue()) {
         prob = 1 - prob;
       }
     }
     // selectAlternative idiom merging two constant MethodHandles.
     // Generate a guard so that each can be inlined.  We might want to
     // do more inputs at later point but this gets the most common
     // case.
     CallGenerator* cg1 = for_method_handle_inline(method_handle->in(1), jvms, caller, callee, profile.rescale(1.0 - prob));
     CallGenerator* cg2 = for_method_handle_inline(method_handle->in(2), jvms, caller, callee, profile.rescale(prob));
     if (cg1 != NULL && cg2 != NULL) {
       const TypeOopPtr* oop_ptr = method_handle->in(1)->bottom_type()->is_oopptr();
       ciObject* const_oop = oop_ptr->const_oop();
       ciMethodHandle* mh = const_oop->as_method_handle();
       return new PredictedDynamicCallGenerator(mh, cg2, cg1, prob);
     }
   }
   return NULL;
 }
 CallGenerator* CallGenerator::for_invokedynamic_inline(ciCallSite* call_site, JVMState* jvms,
                                                        ciMethod* caller, ciMethod* callee, ciCallProfile profile) {
   ciMethodHandle* method_handle = call_site->get_target();
   // Set the callee to have access to the class and signature in the
   // MethodHandleCompiler.
   method_handle->set_callee(callee);
   method_handle->set_caller(caller);
   method_handle->set_call_profile(profile);
   // Get an adapter for the MethodHandle.
   ciMethod* target_method = method_handle->get_invokedynamic_adapter();
   if (target_method != NULL) {
     Compile *C = Compile::current();
     CallGenerator* cg = C->call_generator(target_method, -1, false, jvms, true, PROB_ALWAYS);
     if (cg != NULL && cg->is_inline()) {
       // Add a dependence for invalidation of the optimization.
       if (!call_site->is_constant_call_site()) {
         C->dependencies()->assert_call_site_target_value(call_site, method_handle);
       }
       return cg;
     }
   }
   return NULL;
 }
 JVMState* PredictedDynamicCallGenerator::generate(JVMState* jvms) {
   GraphKit kit(jvms);
   PhaseGVN& gvn = kit.gvn();
   CompileLog* log = kit.C->log();
   if (log != NULL) {
     log->elem("predicted_dynamic_call bci='%d'", jvms->bci());
   }
   const TypeOopPtr* predicted_mh_ptr = TypeOopPtr::make_from_constant(_predicted_method_handle, true);
   Node* predicted_mh = kit.makecon(predicted_mh_ptr);
   Node* bol = NULL;
   int bc = jvms->method()->java_code_at_bci(jvms->bci());
   if (bc != Bytecodes::_invokedynamic) {
     // This is the selectAlternative idiom for guardWithTest or
     // similar idioms.
     Node* receiver = kit.argument(0);
     // Check if the MethodHandle is the expected one
     Node* cmp = gvn.transform(new(kit.C, 3) CmpPNode(receiver, predicted_mh));
     bol = gvn.transform(new(kit.C, 2) BoolNode(cmp, BoolTest::eq) );
   } else {
     // Get the constant pool cache from the caller class.
     ciMethod* caller_method = jvms->method();
     ciBytecodeStream str(caller_method);
     str.force_bci(jvms->bci());  // Set the stream to the invokedynamic bci.
     ciCPCache* cpcache = str.get_cpcache();
     // Get the offset of the CallSite from the constant pool cache
     // pointer.
     int index = str.get_method_index();
     size_t call_site_offset = cpcache->get_f1_offset(index);
     // Load the CallSite object from the constant pool cache.
     const TypeOopPtr* cpcache_ptr = TypeOopPtr::make_from_constant(cpcache);
     Node* cpcache_adr   = kit.makecon(cpcache_ptr);
     Node* call_site_adr = kit.basic_plus_adr(cpcache_adr, cpcache_adr, call_site_offset);
     Node* call_site     = kit.make_load(kit.control(), call_site_adr, TypeInstPtr::BOTTOM, T_OBJECT, Compile::AliasIdxRaw);
     // Load the target MethodHandle from the CallSite object.
     Node* target_adr = kit.basic_plus_adr(call_site, call_site, java_lang_invoke_CallSite::target_offset_in_bytes());
     Node* target_mh  = kit.make_load(kit.control(), target_adr, TypeInstPtr::BOTTOM, T_OBJECT);
     // Check if the MethodHandle is still the same.
     Node* cmp = gvn.transform(new(kit.C, 3) CmpPNode(target_mh, predicted_mh));
     bol = gvn.transform(new(kit.C, 2) BoolNode(cmp, BoolTest::eq) );
   }
   IfNode* iff = kit.create_and_xform_if(kit.control(), bol, _hit_prob, COUNT_UNKNOWN);
   kit.set_control( gvn.transform(new(kit.C, 1) IfTrueNode (iff)));
   Node* slow_ctl = gvn.transform(new(kit.C, 1) IfFalseNode(iff));
   SafePointNode* slow_map = NULL;
   JVMState* slow_jvms;
   { PreserveJVMState pjvms(&kit);
     kit.set_control(slow_ctl);
     if (!kit.stopped()) {
       slow_jvms = _if_missed->generate(kit.sync_jvms());
       assert(slow_jvms != NULL, "miss path must not fail to generate");
       kit.add_exception_states_from(slow_jvms);
       kit.set_map(slow_jvms->map());
       if (!kit.stopped())
         slow_map = kit.stop();
     }
   }
   if (kit.stopped()) {
     // Instance exactly does not matches the desired type.
     kit.set_jvms(slow_jvms);
     return kit.transfer_exceptions_into_jvms();
   }
   // Make the hot call:
   JVMState* new_jvms = _if_hit->generate(kit.sync_jvms());
   if (new_jvms == NULL) {
     // Inline failed, so make a direct call.
     assert(_if_hit->is_inline(), "must have been a failed inline");
     CallGenerator* cg = CallGenerator::for_direct_call(_if_hit->method());
     new_jvms = cg->generate(kit.sync_jvms());
   }
   kit.add_exception_states_from(new_jvms);
   kit.set_jvms(new_jvms);
   // Need to merge slow and fast?
   if (slow_map == NULL) {
     // The fast path is the only path remaining.
     return kit.transfer_exceptions_into_jvms();
   }
   if (kit.stopped()) {
     // Inlined method threw an exception, so it's just the slow path after all.
     kit.set_jvms(slow_jvms);
     return kit.transfer_exceptions_into_jvms();
   }
   // Finish the diamond.
   kit.C->set_has_split_ifs(true); // Has chance for split-if optimization
   RegionNode* region = new (kit.C, 3) RegionNode(3);
   region->init_req(1, kit.control());
   region->init_req(2, slow_map->control());
   kit.set_control(gvn.transform(region));
   Node* iophi = PhiNode::make(region, kit.i_o(), Type::ABIO);
   iophi->set_req(2, slow_map->i_o());
   kit.set_i_o(gvn.transform(iophi));
   kit.merge_memory(slow_map->merged_memory(), region, 2);
   uint tos = kit.jvms()->stkoff() + kit.sp();
   uint limit = slow_map->req();
   for (uint i = TypeFunc::Parms; i < limit; i++) {
     // Skip unused stack slots; fast forward to monoff();
     if (i == tos) {
       i = kit.jvms()->monoff();
       if( i >= limit ) break;
     }
     Node* m = kit.map()->in(i);
     Node* n = slow_map->in(i);
     if (m != n) {
       const Type* t = gvn.type(m)->meet(gvn.type(n));
       Node* phi = PhiNode::make(region, m, t);
       phi->set_req(2, n);
       kit.map()->set_req(i, gvn.transform(phi));
     }
   }
   return kit.transfer_exceptions_into_jvms();
 }
 //-------------------------UncommonTrapCallGenerator-----------------------------
 // Internal class which handles all out-of-line calls checking receiver type.
 class UncommonTrapCallGenerator : public CallGenerator {
   Deoptimization::DeoptReason _reason;
   Deoptimization::DeoptAction _action;
 public:
   UncommonTrapCallGenerator(ciMethod* m,
                             Deoptimization::DeoptReason reason,
                             Deoptimization::DeoptAction action)
     : CallGenerator(m)
   {
     _reason = reason;
     _action = action;
   }
   virtual bool      is_virtual() const          { ShouldNotReachHere(); return false; }
   virtual bool      is_trap() const             { return true; }
   virtual JVMState* generate(JVMState* jvms);
 };
 CallGenerator*
 CallGenerator::for_uncommon_trap(ciMethod* m,
                                  Deoptimization::DeoptReason reason,
                                  Deoptimization::DeoptAction action) {
   return new UncommonTrapCallGenerator(m, reason, action);
 }
 JVMState* UncommonTrapCallGenerator::generate(JVMState* jvms) {
   GraphKit kit(jvms);
   // Take the trap with arguments pushed on the stack.  (Cf. null_check_receiver).
   int nargs = method()->arg_size();
   kit.inc_sp(nargs);
   assert(nargs <= kit.sp() && kit.sp() <= jvms->stk_size(), "sane sp w/ args pushed");
   if (_reason == Deoptimization::Reason_class_check &&
       _action == Deoptimization::Action_maybe_recompile) {
     // Temp fix for 6529811
     // Don't allow uncommon_trap to override our decision to recompile in the event
     // of a class cast failure for a monomorphic call as it will never let us convert
     // the call to either bi-morphic or megamorphic and can lead to unc-trap loops
     bool keep_exact_action = true;
     kit.uncommon_trap(_reason, _action, NULL, "monomorphic vcall checkcast", false, keep_exact_action);
   } else {
     kit.uncommon_trap(_reason, _action);
   }
   return kit.transfer_exceptions_into_jvms();
 }
 // (Note:  Moved hook_up_call to GraphKit::set_edges_for_java_call.)
 // (Node:  Merged hook_up_exits into ParseGenerator::generate.)
 #define NODES_OVERHEAD_PER_METHOD (30.0)
 #define NODES_PER_BYTECODE (9.5)
 void WarmCallInfo::init(JVMState* call_site, ciMethod* call_method, ciCallProfile& profile, float prof_factor) {
   int call_count = profile.count();
   int code_size = call_method->code_size();
   // Expected execution count is based on the historical count:
   _count = call_count < 0 ? 1 : call_site->method()->scale_count(call_count, prof_factor);
   // Expected profit from inlining, in units of simple call-overheads.
   _profit = 1.0;
   // Expected work performed by the call in units of call-overheads.
   // %%% need an empirical curve fit for "work" (time in call)
   float bytecodes_per_call = 3;
   _work = 1.0 + code_size / bytecodes_per_call;
   // Expected size of compilation graph:
   // -XX:+PrintParseStatistics once reported:
   //  Methods seen: 9184  Methods parsed: 9184  Nodes created: 1582391
   //  Histogram of 144298 parsed bytecodes:
   // %%% Need an better predictor for graph size.
   _size = NODES_OVERHEAD_PER_METHOD + (NODES_PER_BYTECODE * code_size);
 }
 // is_cold:  Return true if the node should never be inlined.
 // This is true if any of the key metrics are extreme.
 bool WarmCallInfo::is_cold() const {
   if (count()  <  WarmCallMinCount)        return true;
   if (profit() <  WarmCallMinProfit)       return true;
   if (work()   >  WarmCallMaxWork)         return true;
   if (size()   >  WarmCallMaxSize)         return true;
   return false;
 }
 // is_hot:  Return true if the node should be inlined immediately.
 // This is true if any of the key metrics are extreme.
 bool WarmCallInfo::is_hot() const {
   assert(!is_cold(), "eliminate is_cold cases before testing is_hot");
   if (count()  >= HotCallCountThreshold)   return true;
   if (profit() >= HotCallProfitThreshold)  return true;
   if (work()   <= HotCallTrivialWork)      return true;
   if (size()   <= HotCallTrivialSize)      return true;
   return false;
 }
 // compute_heat:
 float WarmCallInfo::compute_heat() const {
   assert(!is_cold(), "compute heat only on warm nodes");
   assert(!is_hot(),  "compute heat only on warm nodes");
   int min_size = MAX2(0,   (int)HotCallTrivialSize);
   int max_size = MIN2(500, (int)WarmCallMaxSize);
   float method_size = (size() - min_size) / MAX2(1, max_size - min_size);
   float size_factor;
   if      (method_size < 0.05)  size_factor = 4;   // 2 sigmas better than avg.
   else if (method_size < 0.15)  size_factor = 2;   // 1 sigma better than avg.
   else if (method_size < 0.5)   size_factor = 1;   // better than avg.
   else                          size_factor = 0.5; // worse than avg.
   return (count() * profit() * size_factor);
 }
 bool WarmCallInfo::warmer_than(WarmCallInfo* that) {
   assert(this != that, "compare only different WCIs");
   assert(this->heat() != 0 && that->heat() != 0, "call compute_heat 1st");
   if (this->heat() > that->heat())   return true;
   if (this->heat() < that->heat())   return false;
   assert(this->heat() == that->heat(), "no NaN heat allowed");
   // Equal heat.  Break the tie some other way.
   if (!this->call() || !that->call())  return (address)this > (address)that;
   return this->call()->_idx > that->call()->_idx;
 }
 //#define UNINIT_NEXT ((WarmCallInfo*)badAddress)
 #define UNINIT_NEXT ((WarmCallInfo*)NULL)
 WarmCallInfo* WarmCallInfo::insert_into(WarmCallInfo* head) {
   assert(next() == UNINIT_NEXT, "not yet on any list");
   WarmCallInfo* prev_p = NULL;
   WarmCallInfo* next_p = head;
   while (next_p != NULL && next_p->warmer_than(this)) {
     prev_p = next_p;
     next_p = prev_p->next();
   }
   // Install this between prev_p and next_p.
   this->set_next(next_p);
   if (prev_p == NULL)
     head = this;
   else
     prev_p->set_next(this);
   return head;
 }
 WarmCallInfo* WarmCallInfo::remove_from(WarmCallInfo* head) {
   WarmCallInfo* prev_p = NULL;
   WarmCallInfo* next_p = head;
   while (next_p != this) {
     assert(next_p != NULL, "this must be in the list somewhere");
     prev_p = next_p;
     next_p = prev_p->next();
   }
   next_p = this->next();
   debug_only(this->set_next(UNINIT_NEXT));
   // Remove this from between prev_p and next_p.
   if (prev_p == NULL)
     head = next_p;
   else
     prev_p->set_next(next_p);
   return head;
 }
 WarmCallInfo WarmCallInfo::_always_hot(WarmCallInfo::MAX_VALUE(), WarmCallInfo::MAX_VALUE(),
                                        WarmCallInfo::MIN_VALUE(), WarmCallInfo::MIN_VALUE());
 WarmCallInfo WarmCallInfo::_always_cold(WarmCallInfo::MIN_VALUE(), WarmCallInfo::MIN_VALUE(),
                                         WarmCallInfo::MAX_VALUE(), WarmCallInfo::MAX_VALUE());
 WarmCallInfo* WarmCallInfo::always_hot() {
   assert(_always_hot.is_hot(), "must always be hot");
   return &_always_hot;
 }
 WarmCallInfo* WarmCallInfo::always_cold() {
   assert(_always_cold.is_cold(), "must always be cold");
   return &_always_cold;
 }
 #ifndef PRODUCT
 void WarmCallInfo::print() const {
   tty->print("%s : C=%6.1f P=%6.1f W=%6.1f S=%6.1f H=%6.1f -> %p",
              is_cold() ? "cold" : is_hot() ? "hot " : "warm",
              count(), profit(), work(), size(), compute_heat(), next());
   tty->cr();
   if (call() != NULL)  call()->dump();
 }
 void print_wci(WarmCallInfo* ci) {
   ci->print();
 }
 void WarmCallInfo::print_all() const {
   for (const WarmCallInfo* p = this; p != NULL; p = p->next())
     p->print();
 }
 int WarmCallInfo::count_all() const {
   int cnt = 0;
   for (const WarmCallInfo* p = this; p != NULL; p = p->next())
     cnt++;
   return cnt;
 }
 #endif //PRODUCT

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/callGenerator.cpp@1bd45abaa507 (annotated)

src/share/vm/opto/callGenerator.cpp