jdk8-mips64-public/hotspot: src/share/vm/opto/bytecodeInfo.cpp@ad5dd04754ee (annotated)

src/share/vm/opto/bytecodeInfo.cpp@ad5dd04754ee (annotated)

src/share/vm/opto/bytecodeInfo.cpp

Tue, 18 Dec 2012 14:55:25 +0100

author: roland
date: Tue, 18 Dec 2012 14:55:25 +0100
changeset 4357: ad5dd04754ee
parent 4267: bd7a7ce2e264
child 4409: d092d1b31229
permissions: -rw-r--r--

8005031: Some cleanup in c2 to prepare for incremental inlining support
Summary: collection of small changes to prepare for incremental inlining.
Reviewed-by: twisti, kvn

 /*
  * 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/ciReplay.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "compiler/compileBroker.hpp"
 #include "compiler/compileLog.hpp"
 #include "interpreter/linkResolver.hpp"
 #include "oops/objArrayKlass.hpp"
 #include "opto/callGenerator.hpp"
 #include "opto/parse.hpp"
 #include "runtime/handles.inline.hpp"
 //=============================================================================
 //------------------------------InlineTree-------------------------------------
 InlineTree::InlineTree(Compile* c,
                        const InlineTree *caller_tree, ciMethod* callee,
                        JVMState* caller_jvms, int caller_bci,
                        float site_invoke_ratio, int max_inline_level) :
   C(c),
   _caller_jvms(caller_jvms),
   _caller_tree((InlineTree*) caller_tree),
   _method(callee),
   _site_invoke_ratio(site_invoke_ratio),
   _max_inline_level(max_inline_level),
   _count_inline_bcs(method()->code_size_for_inlining())
 {
   NOT_PRODUCT(_count_inlines = 0;)
   if (_caller_jvms != NULL) {
     // Keep a private copy of the caller_jvms:
     _caller_jvms = new (C) JVMState(caller_jvms->method(), caller_tree->caller_jvms());
     _caller_jvms->set_bci(caller_jvms->bci());
     assert(!caller_jvms->should_reexecute(), "there should be no reexecute bytecode with inlining");
   }
   assert(_caller_jvms->same_calls_as(caller_jvms), "consistent JVMS");
   assert((caller_tree == NULL ? 0 : caller_tree->stack_depth() + 1) == stack_depth(), "correct (redundant) depth parameter");
   assert(caller_bci == this->caller_bci(), "correct (redundant) bci parameter");
   if (UseOldInlining) {
     // Update hierarchical counts, count_inline_bcs() and count_inlines()
     InlineTree *caller = (InlineTree *)caller_tree;
     for( ; caller != NULL; caller = ((InlineTree *)(caller->caller_tree())) ) {
       caller->_count_inline_bcs += count_inline_bcs();
       NOT_PRODUCT(caller->_count_inlines++;)
     }
   }
 }
 InlineTree::InlineTree(Compile* c, ciMethod* callee_method, JVMState* caller_jvms,
                        float site_invoke_ratio, int max_inline_level) :
   C(c),
   _caller_jvms(caller_jvms),
   _caller_tree(NULL),
   _method(callee_method),
   _site_invoke_ratio(site_invoke_ratio),
   _max_inline_level(max_inline_level),
   _count_inline_bcs(method()->code_size())
 {
   NOT_PRODUCT(_count_inlines = 0;)
   assert(!UseOldInlining, "do not use for old stuff");
 }
 static bool is_init_with_ea(ciMethod* callee_method,
                             ciMethod* caller_method, Compile* C) {
   // True when EA is ON and a java constructor is called or
   // a super constructor is called from an inlined java constructor.
   return C->do_escape_analysis() && EliminateAllocations &&
          ( callee_method->is_initializer() ||
            (caller_method->is_initializer() &&
             caller_method != C->method() &&
             caller_method->holder()->is_subclass_of(callee_method->holder()))
          );
 }
 // positive filter: should callee be inlined?  returns NULL, if yes, or rejection msg
 const char* InlineTree::should_inline(ciMethod* callee_method, ciMethod* caller_method, int caller_bci, ciCallProfile& profile, WarmCallInfo* wci_result) const {
   // Allows targeted inlining
   if(callee_method->should_inline()) {
     *wci_result = *(WarmCallInfo::always_hot());
     if (PrintInlining && Verbose) {
       CompileTask::print_inline_indent(inline_level());
       tty->print_cr("Inlined method is hot: ");
     }
     return NULL;
   }
   // positive filter: should send be inlined?  returns NULL (--> yes)
   // or rejection msg
   int size = callee_method->code_size_for_inlining();
   // Check for too many throws (and not too huge)
   if(callee_method->interpreter_throwout_count() > InlineThrowCount &&
      size < InlineThrowMaxSize ) {
     wci_result->set_profit(wci_result->profit() * 100);
     if (PrintInlining && Verbose) {
       CompileTask::print_inline_indent(inline_level());
       tty->print_cr("Inlined method with many throws (throws=%d):", callee_method->interpreter_throwout_count());
     }
     return NULL;
   }
   if (!UseOldInlining) {
     return NULL;  // size and frequency are represented in a new way
   }
   int default_max_inline_size = C->max_inline_size();
   int inline_small_code_size  = InlineSmallCode / 4;
   int max_inline_size         = default_max_inline_size;
   int call_site_count  = method()->scale_count(profile.count());
   int invoke_count     = method()->interpreter_invocation_count();
   assert(invoke_count != 0, "require invocation count greater than zero");
   int freq = call_site_count / invoke_count;
   // bump the max size if the call is frequent
   if ((freq >= InlineFrequencyRatio) ||
       (call_site_count >= InlineFrequencyCount) ||
       is_init_with_ea(callee_method, caller_method, C)) {
     max_inline_size = C->freq_inline_size();
     if (size <= max_inline_size && TraceFrequencyInlining) {
       CompileTask::print_inline_indent(inline_level());
       tty->print_cr("Inlined frequent method (freq=%d count=%d):", freq, call_site_count);
       CompileTask::print_inline_indent(inline_level());
       callee_method->print();
       tty->cr();
     }
   } else {
     // Not hot.  Check for medium-sized pre-existing nmethod at cold sites.
     if (callee_method->has_compiled_code() &&
         callee_method->instructions_size() > inline_small_code_size)
       return "already compiled into a medium method";
   }
   if (size > max_inline_size) {
     if (max_inline_size > default_max_inline_size)
       return "hot method too big";
     return "too big";
   }
   return NULL;
 }
 // negative filter: should callee NOT be inlined?  returns NULL, ok to inline, or rejection msg
 const char* InlineTree::should_not_inline(ciMethod *callee_method, ciMethod* caller_method, WarmCallInfo* wci_result) const {
   // negative filter: should send NOT be inlined?  returns NULL (--> inline) or rejection msg
   if (!UseOldInlining) {
     const char* fail = NULL;
     if ( callee_method->is_abstract())               fail = "abstract method";
     // note: we allow ik->is_abstract()
     if (!callee_method->holder()->is_initialized())  fail = "method holder not initialized";
     if ( callee_method->is_native())                 fail = "native method";
     if ( callee_method->dont_inline())               fail = "don't inline by annotation";
     if (fail) {
       *wci_result = *(WarmCallInfo::always_cold());
       return fail;
     }
     if (callee_method->has_unloaded_classes_in_signature()) {
       wci_result->set_profit(wci_result->profit() * 0.1);
     }
     // don't inline exception code unless the top method belongs to an
     // exception class
     if (callee_method->holder()->is_subclass_of(C->env()->Throwable_klass())) {
       ciMethod* top_method = caller_jvms() ? caller_jvms()->of_depth(1)->method() : method();
       if (!top_method->holder()->is_subclass_of(C->env()->Throwable_klass())) {
         wci_result->set_profit(wci_result->profit() * 0.1);
       }
     }
     if (callee_method->has_compiled_code() &&
         callee_method->instructions_size() > InlineSmallCode) {
       wci_result->set_profit(wci_result->profit() * 0.1);
       // %%% adjust wci_result->size()?
     }
     return NULL;
   }
   // First check all inlining restrictions which are required for correctness
   if ( callee_method->is_abstract())                        return "abstract method";
   // note: we allow ik->is_abstract()
   if (!callee_method->holder()->is_initialized())           return "method holder not initialized";
   if ( callee_method->is_native())                          return "native method";
   if ( callee_method->dont_inline())                        return "don't inline by annotation";
   if ( callee_method->has_unloaded_classes_in_signature())  return "unloaded signature classes";
   if (callee_method->force_inline() || callee_method->should_inline()) {
     // ignore heuristic controls on inlining
     return NULL;
   }
   // Now perform checks which are heuristic
   if (callee_method->has_compiled_code() &&
       callee_method->instructions_size() > InlineSmallCode) {
     return "already compiled into a big method";
   }
   // don't inline exception code unless the top method belongs to an
   // exception class
   if (caller_tree() != NULL &&
       callee_method->holder()->is_subclass_of(C->env()->Throwable_klass())) {
     const InlineTree *top = this;
     while (top->caller_tree() != NULL) top = top->caller_tree();
     ciInstanceKlass* k = top->method()->holder();
     if (!k->is_subclass_of(C->env()->Throwable_klass()))
       return "exception method";
   }
   if (callee_method->should_not_inline()) {
     return "disallowed by CompilerOracle";
   }
 #ifndef PRODUCT
   if (ciReplay::should_not_inline(callee_method)) {
     return "disallowed by ciReplay";
   }
 #endif
   if (UseStringCache) {
     // Do not inline StringCache::profile() method used only at the beginning.
     if (callee_method->name() == ciSymbol::profile_name() &&
         callee_method->holder()->name() == ciSymbol::java_lang_StringCache()) {
       return "profiling method";
     }
   }
   // use frequency-based objections only for non-trivial methods
   if (callee_method->code_size() <= MaxTrivialSize) return NULL;
   // don't use counts with -Xcomp or CTW
   if (UseInterpreter && !CompileTheWorld) {
     if (!callee_method->has_compiled_code() &&
         !callee_method->was_executed_more_than(0)) {
       return "never executed";
     }
     if (is_init_with_ea(callee_method, caller_method, C)) {
       // Escape Analysis: inline all executed constructors
     } else if (!callee_method->was_executed_more_than(MIN2(MinInliningThreshold,
                                                            CompileThreshold >> 1))) {
       return "executed < MinInliningThreshold times";
     }
   }
   return NULL;
 }
 //-----------------------------try_to_inline-----------------------------------
 // return NULL if ok, reason for not inlining otherwise
 // Relocated from "InliningClosure::try_to_inline"
 const char* InlineTree::try_to_inline(ciMethod* callee_method, ciMethod* caller_method, int caller_bci, ciCallProfile& profile, WarmCallInfo* wci_result) {
   // Old algorithm had funny accumulating BC-size counters
   if (UseOldInlining && ClipInlining
       && (int)count_inline_bcs() >= DesiredMethodLimit) {
     return "size > DesiredMethodLimit";
   }
   const char *msg = NULL;
   msg = should_inline(callee_method, caller_method, caller_bci, profile, wci_result);
   if (msg != NULL)
     return msg;
   msg = should_not_inline(callee_method, caller_method, wci_result);
   if (msg != NULL)
     return msg;
   if (InlineAccessors && callee_method->is_accessor()) {
     // accessor methods are not subject to any of the following limits.
     return NULL;
   }
   // suppress a few checks for accessors and trivial methods
   if (callee_method->code_size() > MaxTrivialSize) {
     // don't inline into giant methods
     if (C->unique() > (uint)NodeCountInliningCutoff) {
       return "NodeCountInliningCutoff";
     }
     if ((!UseInterpreter || CompileTheWorld) &&
         is_init_with_ea(callee_method, caller_method, C)) {
       // Escape Analysis stress testing when running Xcomp or CTW:
       // inline constructors even if they are not reached.
     } else if (profile.count() == 0) {
       // don't inline unreached call sites
       return "call site not reached";
     }
   }
   if (!C->do_inlining() && InlineAccessors) {
     return "not an accessor";
   }
   if (inline_level() > _max_inline_level) {
     return "inlining too deep";
   }
   // detect direct and indirect recursive inlining
   if (!callee_method->is_compiled_lambda_form()) {
     // count the current method and the callee
     int inline_level = (method() == callee_method) ? 1 : 0;
     if (inline_level > MaxRecursiveInlineLevel)
       return "recursively inlining too deep";
     // count callers of current method and callee
     JVMState* jvms = caller_jvms();
     while (jvms != NULL && jvms->has_method()) {
       if (jvms->method() == callee_method) {
         inline_level++;
         if (inline_level > MaxRecursiveInlineLevel)
           return "recursively inlining too deep";
       }
       jvms = jvms->caller();
     }
   }
   int size = callee_method->code_size_for_inlining();
   if (UseOldInlining && ClipInlining
       && (int)count_inline_bcs() + size >= DesiredMethodLimit) {
     return "size > DesiredMethodLimit";
   }
   // ok, inline this method
   return NULL;
 }
 //------------------------------pass_initial_checks----------------------------
 bool pass_initial_checks(ciMethod* caller_method, int caller_bci, ciMethod* callee_method) {
   ciInstanceKlass *callee_holder = callee_method ? callee_method->holder() : NULL;
   // Check if a callee_method was suggested
   if( callee_method == NULL )            return false;
   // Check if klass of callee_method is loaded
   if( !callee_holder->is_loaded() )      return false;
   if( !callee_holder->is_initialized() ) return false;
   if( !UseInterpreter || CompileTheWorld /* running Xcomp or CTW */ ) {
     // Checks that constant pool's call site has been visited
     // stricter than callee_holder->is_initialized()
     ciBytecodeStream iter(caller_method);
     iter.force_bci(caller_bci);
     Bytecodes::Code call_bc = iter.cur_bc();
     // An invokedynamic instruction does not have a klass.
     if (call_bc != Bytecodes::_invokedynamic) {
       int index = iter.get_index_u2_cpcache();
       if (!caller_method->is_klass_loaded(index, true)) {
         return false;
       }
       // Try to do constant pool resolution if running Xcomp
       if( !caller_method->check_call(index, call_bc == Bytecodes::_invokestatic) ) {
         return false;
       }
     }
   }
   // We will attempt to see if a class/field/etc got properly loaded.  If it
   // did not, it may attempt to throw an exception during our probing.  Catch
   // and ignore such exceptions and do not attempt to compile the method.
   if( callee_method->should_exclude() )  return false;
   return true;
 }
 //------------------------------check_can_parse--------------------------------
 const char* InlineTree::check_can_parse(ciMethod* callee) {
   // Certain methods cannot be parsed at all:
   if ( callee->is_native())                     return "native method";
   if ( callee->is_abstract())                   return "abstract method";
   if (!callee->can_be_compiled())               return "not compilable (disabled)";
   if (!callee->has_balanced_monitors())         return "not compilable (unbalanced monitors)";
   if ( callee->get_flow_analysis()->failing())  return "not compilable (flow analysis failed)";
   return NULL;
 }
 //------------------------------print_inlining---------------------------------
 // Really, the failure_msg can be a success message also.
 void InlineTree::print_inlining(ciMethod* callee_method, int caller_bci, const char* failure_msg) const {
   C->print_inlining(callee_method, inline_level(), caller_bci, failure_msg ? failure_msg : "inline");
   if (callee_method == NULL)  tty->print(" callee not monotonic or profiled");
   if (Verbose && callee_method) {
     const InlineTree *top = this;
     while( top->caller_tree() != NULL ) { top = top->caller_tree(); }
     //tty->print("  bcs: %d+%d  invoked: %d", top->count_inline_bcs(), callee_method->code_size(), callee_method->interpreter_invocation_count());
   }
 }
 //------------------------------ok_to_inline-----------------------------------
 WarmCallInfo* InlineTree::ok_to_inline(ciMethod* callee_method, JVMState* jvms, ciCallProfile& profile, WarmCallInfo* initial_wci) {
   assert(callee_method != NULL, "caller checks for optimized virtual!");
 #ifdef ASSERT
   // Make sure the incoming jvms has the same information content as me.
   // This means that we can eventually make this whole class AllStatic.
   if (jvms->caller() == NULL) {
     assert(_caller_jvms == NULL, "redundant instance state");
   } else {
     assert(_caller_jvms->same_calls_as(jvms->caller()), "redundant instance state");
   }
   assert(_method == jvms->method(), "redundant instance state");
 #endif
   const char *failure_msg   = NULL;
   int         caller_bci    = jvms->bci();
   ciMethod   *caller_method = jvms->method();
   // Do some initial checks.
   if (!pass_initial_checks(caller_method, caller_bci, callee_method)) {
     if (PrintInlining)  print_inlining(callee_method, caller_bci, "failed initial checks");
     return NULL;
   }
   // Do some parse checks.
   failure_msg = check_can_parse(callee_method);
   if (failure_msg != NULL) {
     if (PrintInlining)  print_inlining(callee_method, caller_bci, failure_msg);
     return NULL;
   }
   // Check if inlining policy says no.
   WarmCallInfo wci = *(initial_wci);
   failure_msg = try_to_inline(callee_method, caller_method, caller_bci, profile, &wci);
   if (failure_msg != NULL && C->log() != NULL) {
     C->log()->inline_fail(failure_msg);
   }
 #ifndef PRODUCT
   if (UseOldInlining && InlineWarmCalls
       && (PrintOpto || PrintOptoInlining || PrintInlining)) {
     bool cold = wci.is_cold();
     bool hot  = !cold && wci.is_hot();
     bool old_cold = (failure_msg != NULL);
     if (old_cold != cold || (Verbose || WizardMode)) {
       tty->print("   OldInlining= %4s : %s\n           WCI=",
                  old_cold ? "cold" : "hot", failure_msg ? failure_msg : "OK");
       wci.print();
     }
   }
 #endif
   if (UseOldInlining) {
     if (failure_msg == NULL)
       wci = *(WarmCallInfo::always_hot());
     else
       wci = *(WarmCallInfo::always_cold());
   }
   if (!InlineWarmCalls) {
     if (!wci.is_cold() && !wci.is_hot()) {
       // Do not inline the warm calls.
       wci = *(WarmCallInfo::always_cold());
     }
   }
   if (!wci.is_cold()) {
     // In -UseOldInlining, the failure_msg may also be a success message.
     if (failure_msg == NULL)  failure_msg = "inline (hot)";
     // Inline!
     if (PrintInlining)  print_inlining(callee_method, caller_bci, failure_msg);
     if (UseOldInlining)
       build_inline_tree_for_callee(callee_method, jvms, caller_bci);
     if (InlineWarmCalls && !wci.is_hot())
       return new (C) WarmCallInfo(wci);  // copy to heap
     return WarmCallInfo::always_hot();
   }
   // Do not inline
   if (failure_msg == NULL)  failure_msg = "too cold to inline";
   if (PrintInlining)  print_inlining(callee_method, caller_bci, failure_msg);
   return NULL;
 }
 //------------------------------compute_callee_frequency-----------------------
 float InlineTree::compute_callee_frequency( int caller_bci ) const {
   int count  = method()->interpreter_call_site_count(caller_bci);
   int invcnt = method()->interpreter_invocation_count();
   float freq = (float)count/(float)invcnt;
   // Call-site count / interpreter invocation count, scaled recursively.
   // Always between 0.0 and 1.0.  Represents the percentage of the method's
   // total execution time used at this call site.
   return freq;
 }
 //------------------------------build_inline_tree_for_callee-------------------
 InlineTree *InlineTree::build_inline_tree_for_callee( ciMethod* callee_method, JVMState* caller_jvms, int caller_bci) {
   float recur_frequency = _site_invoke_ratio * compute_callee_frequency(caller_bci);
   // Attempt inlining.
   InlineTree* old_ilt = callee_at(caller_bci, callee_method);
   if (old_ilt != NULL) {
     return old_ilt;
   }
   int max_inline_level_adjust = 0;
   if (caller_jvms->method() != NULL) {
     if (caller_jvms->method()->is_compiled_lambda_form())
       max_inline_level_adjust += 1;  // don't count actions in MH or indy adapter frames
     else if (callee_method->is_method_handle_intrinsic() ||
              callee_method->is_compiled_lambda_form()) {
       max_inline_level_adjust += 1;  // don't count method handle calls from java.lang.invoke implem
     }
     if (max_inline_level_adjust != 0 && PrintInlining && (Verbose || WizardMode)) {
       CompileTask::print_inline_indent(inline_level());
       tty->print_cr(" \\-> discounting inline depth");
     }
     if (max_inline_level_adjust != 0 && C->log()) {
       int id1 = C->log()->identify(caller_jvms->method());
       int id2 = C->log()->identify(callee_method);
       C->log()->elem("inline_level_discount caller='%d' callee='%d'", id1, id2);
     }
   }
   InlineTree* ilt = new InlineTree(C, this, callee_method, caller_jvms, caller_bci, recur_frequency, _max_inline_level + max_inline_level_adjust);
   _subtrees.append(ilt);
   NOT_PRODUCT( _count_inlines += 1; )
   return ilt;
 }
 //---------------------------------------callee_at-----------------------------
 InlineTree *InlineTree::callee_at(int bci, ciMethod* callee) const {
   for (int i = 0; i < _subtrees.length(); i++) {
     InlineTree* sub = _subtrees.at(i);
     if (sub->caller_bci() == bci && callee == sub->method()) {
       return sub;
     }
   }
   return NULL;
 }
 //------------------------------build_inline_tree_root-------------------------
 InlineTree *InlineTree::build_inline_tree_root() {
   Compile* C = Compile::current();
   // Root of inline tree
   InlineTree* ilt = new InlineTree(C, NULL, C->method(), NULL, -1, 1.0F, MaxInlineLevel);
   return ilt;
 }
 //-------------------------find_subtree_from_root-----------------------------
 // Given a jvms, which determines a call chain from the root method,
 // find the corresponding inline tree.
 // Note: This method will be removed or replaced as InlineTree goes away.
 InlineTree* InlineTree::find_subtree_from_root(InlineTree* root, JVMState* jvms, ciMethod* callee) {
   InlineTree* iltp = root;
   uint depth = jvms && jvms->has_method() ? jvms->depth() : 0;
   for (uint d = 1; d <= depth; d++) {
     JVMState* jvmsp  = jvms->of_depth(d);
     // Select the corresponding subtree for this bci.
     assert(jvmsp->method() == iltp->method(), "tree still in sync");
     ciMethod* d_callee = (d == depth) ? callee : jvms->of_depth(d+1)->method();
     InlineTree* sub = iltp->callee_at(jvmsp->bci(), d_callee);
     if (sub == NULL) {
       if (d == depth) {
         sub = iltp->build_inline_tree_for_callee(d_callee, jvmsp, jvmsp->bci());
       }
       guarantee(sub != NULL, "should be a sub-ilt here");
       return sub;
     }
     iltp = sub;
   }
   return iltp;
 }
 #ifndef PRODUCT
 void InlineTree::print_impl(outputStream* st, int indent) const {
   for (int i = 0; i < indent; i++) st->print(" ");
   st->print(" @ %d ", caller_bci());
   method()->print_short_name(st);
   st->cr();
   for (int i = 0 ; i < _subtrees.length(); i++) {
     _subtrees.at(i)->print_impl(st, indent + 2);
   }
 }
 void InlineTree::print_value_on(outputStream* st) const {
   print_impl(st, 2);
 }
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/bytecodeInfo.cpp@ad5dd04754ee (annotated)

src/share/vm/opto/bytecodeInfo.cpp