--- /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