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 /*

  * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "classfile/vmSymbols.hpp"

 #include "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 site_depth_adjust)

 : C(c), _caller_jvms(caller_jvms),

   _caller_tree((InlineTree*)caller_tree),

   _method(callee), _site_invoke_ratio(site_invoke_ratio),

   _site_depth_adjust(site_depth_adjust),

   _count_inline_bcs(method()->code_size())

 {

   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 site_depth_adjust)

 : C(c), _caller_jvms(caller_jvms), _caller_tree(NULL),

   _method(callee_method), _site_invoke_ratio(site_invoke_ratio),

   _site_depth_adjust(site_depth_adjust),

   _count_inline_bcs(method()->code_size())

 {

   NOT_PRODUCT(_count_inlines = 0;)

   assert(!UseOldInlining, "do not use for old stuff");

 }

 static void print_indent(int depth) {

   tty->print("      ");

   for (int i = depth; i != 0; --i) tty->print("  ");

 }

 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 send be inlined?  returns NULL, if yes, or rejection msg

 const char* InlineTree::shouldInline(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) {

       print_indent(inline_depth());

       tty->print_cr("Inlined method is hot: ");

     }

     return NULL;

   }

   // positive filter: should send be inlined?  returns NULL (--> yes)

   // or rejection msg

   int max_size = C->max_inline_size();

   int size     = callee_method->code_size();

   // 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) {

       print_indent(inline_depth());

       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 call_site_count  = method()->scale_count(profile.count());

   int invoke_count     = method()->interpreter_invocation_count();

   assert( invoke_count != 0, "Require invokation 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_size = C->freq_inline_size();

     if (size <= max_size && TraceFrequencyInlining) {

       print_indent(inline_depth());

       tty->print_cr("Inlined frequent method (freq=%d count=%d):", freq, call_site_count);

       print_indent(inline_depth());

       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(CompLevel_full_optimization) > InlineSmallCode/4)

       return "already compiled into a medium method";

   }

   if (size > max_size) {

     if (max_size > C->max_inline_size())

       return "hot method too big";

     return "too big";

   }

   return NULL;

 }

 // negative filter: should send NOT be inlined?  returns NULL, ok to inline, or rejection msg

 const char* InlineTree::shouldNotInline(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 (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(CompLevel_full_optimization) > InlineSmallCode) {

       wci_result->set_profit(wci_result->profit() * 0.1);

       // %%% adjust wci_result->size()?

     }

     return NULL;

   }

   // Always inline MethodHandle methods and generated MethodHandle adapters.

   if (callee_method->is_method_handle_invoke() || callee_method->is_method_handle_adapter())

     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->has_unloaded_classes_in_signature()) return "unloaded signature classes";

   if (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(CompLevel_full_optimization) > 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";

   }

   // 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";

     }

   }

   if (callee_method->should_not_inline()) {

     return "disallowed by CompilerOracle";

   }

   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";

     }

   }

   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;

   if ((msg = shouldInline(callee_method, caller_method, caller_bci,

                           profile, wci_result)) != NULL) {

     return msg;

   }

   if ((msg = shouldNotInline(callee_method, caller_method,

                              wci_result)) != 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_depth() > MaxInlineLevel ) {

     return "inlining too deep";

   }

   if( method() == callee_method &&

       inline_depth() > MaxRecursiveInlineLevel ) {

     return "recursively inlining too deep";

   }

   int size = callee_method->code_size();

   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;

 }

 #ifndef PRODUCT

 //------------------------------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 {

   print_indent(inline_depth());

   tty->print("@ %d  ", caller_bci);

   if( callee_method ) callee_method->print_short_name();

   else                tty->print(" callee not monotonic or profiled");

   tty->print("  %s", (failure_msg ? failure_msg : "inline"));

   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());

   }

   tty->cr();

 }

 #endif

 //------------------------------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();

   if( !pass_initial_checks(caller_method, caller_bci, callee_method)) {

     if( PrintInlining ) {

       failure_msg = "failed_initial_checks";

       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()->begin_elem("inline_fail reason='");

     C->log()->text("%s", failure_msg);

     C->log()->end_elem("'");

   }

 #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 new_depth_adjust = 0;

   if (caller_jvms->method() != NULL) {

     if (caller_jvms->method()->is_method_handle_adapter())

       new_depth_adjust -= 1;  // don't count actions in MH or indy adapter frames

     else if (callee_method->is_method_handle_invoke()) {

       new_depth_adjust -= 1;  // don't count method handle calls from java.lang.invoke implem

     }

     if (new_depth_adjust != 0 && PrintInlining) {

       stringStream nm1; caller_jvms->method()->print_name(&nm1);

       stringStream nm2; callee_method->print_name(&nm2);

       tty->print_cr("discounting inlining depth from %s to %s", nm1.base(), nm2.base());

     }

     if (new_depth_adjust != 0 && C->log()) {

       int id1 = C->log()->identify(caller_jvms->method());

       int id2 = C->log()->identify(callee_method);

       C->log()->elem("inline_depth_discount caller='%d' callee='%d'", id1, id2);

     }

   }

   InlineTree *ilt = new InlineTree(C, this, callee_method, caller_jvms, caller_bci, recur_frequency, _site_depth_adjust + new_depth_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, 0);

   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, bool create_if_not_found) {

   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) {

       if (create_if_not_found && d == depth) {

         return iltp->build_inline_tree_for_callee(d_callee, jvmsp, jvmsp->bci());

       }

       assert(sub != NULL, "should be a sub-ilt here");

       return NULL;

     }

     iltp = sub;

   }

   return iltp;

 }