diff -r fd16c54261b3 -r 489c9b5090e2 hotspot/src/share/vm/opto/bytecodeInfo.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hotspot/src/share/vm/opto/bytecodeInfo.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,490 @@ +/* + * Copyright 1998-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +#include "incls/_precompiled.incl" +#include "incls/_bytecodeInfo.cpp.incl" + +// These variables are declared in parse1.cpp +extern int explicit_null_checks_inserted; +extern int explicit_null_checks_elided; +extern int explicit_null_checks_inserted_old; +extern int explicit_null_checks_elided_old; +extern int nodes_created_old; +extern int nodes_created; +extern int methods_parsed_old; +extern int methods_parsed; +extern int methods_seen; +extern int methods_seen_old; + + +//============================================================================= +//------------------------------InlineTree------------------------------------- +InlineTree::InlineTree( Compile* c, const InlineTree *caller_tree, ciMethod* callee, JVMState* caller_jvms, int caller_bci, float site_invoke_ratio ) +: C(c), _caller_jvms(caller_jvms), + _caller_tree((InlineTree*)caller_tree), + _method(callee), _site_invoke_ratio(site_invoke_ratio), + _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->same_calls_as(caller_jvms), "consistent JVMS"); + assert((caller_tree == NULL ? 0 : caller_tree->inline_depth() + 1) == inline_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) +: C(c), _caller_jvms(caller_jvms), _caller_tree(NULL), + _method(callee_method), _site_invoke_ratio(site_invoke_ratio), + _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(" "); +} + +// positive filter: should send be inlined? returns NULL, if yes, or rejection msg +const char* InlineTree::shouldInline(ciMethod* callee_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)) { + 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() > 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, 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() > 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->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() > 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; + if (UseInterpreter && !CompileTheWorld) { // don't use counts with -Xcomp or CTW + if (!callee_method->has_compiled_code() && !callee_method->was_executed_more_than(0)) return "never executed"; + 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"; + } + + 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, int caller_bci, ciCallProfile& profile, WarmCallInfo* wci_result) { + ciMethod* caller_method = method(); + + // 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_bci, profile, wci_result)) != NULL) return msg; + if ((msg = shouldNotInline(callee_method, wci_result)) != NULL) return msg; + + bool is_accessor = InlineAccessors && callee_method->is_accessor(); + + // suppress a few checks for accessors and trivial methods + if (!is_accessor && callee_method->code_size() > MaxTrivialSize) { + // don't inline into giant methods + if (C->unique() > (uint)NodeCountInliningCutoff) return "NodeCountInliningCutoff"; + + // don't inline unreached call sites + if (profile.count() == 0) return "call site not reached"; + } + + if (!C->do_inlining() && InlineAccessors && !is_accessor) 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); + int index = iter.get_index_big(); + if( !caller_method->is_klass_loaded(index, true) ) { + return false; + } + // Try to do constant pool resolution if running Xcomp + Bytecodes::Code call_bc = iter.cur_bc(); + 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_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; + } + InlineTree *ilt = new InlineTree( C, this, callee_method, caller_jvms, caller_bci, recur_frequency ); + _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); + + 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; +} + +// ---------------------------------------------------------------------------- +#ifndef PRODUCT + +static void per_method_stats() { + // Compute difference between this method's cumulative totals and old totals + int explicit_null_checks_cur = explicit_null_checks_inserted - explicit_null_checks_inserted_old; + int elided_null_checks_cur = explicit_null_checks_elided - explicit_null_checks_elided_old; + + // Print differences + if( explicit_null_checks_cur ) + tty->print_cr("XXX Explicit NULL checks inserted: %d", explicit_null_checks_cur); + if( elided_null_checks_cur ) + tty->print_cr("XXX Explicit NULL checks removed at parse time: %d", elided_null_checks_cur); + + // Store the current cumulative totals + nodes_created_old = nodes_created; + methods_parsed_old = methods_parsed; + methods_seen_old = methods_seen; + explicit_null_checks_inserted_old = explicit_null_checks_inserted; + explicit_null_checks_elided_old = explicit_null_checks_elided; +} + +#endif