truffle: src/share/vm/opto/doCall.cpp comparison

comparison src/share/vm/opto/doCall.cpp @ 0:a61af66fc99e jdk7-b24

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author	duke
date	Sat, 01 Dec 2007 00:00:00 +0000
parents
children	16e1cb7cde24

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--1:000000000000
+:a61af66fc99e
+/*
+* Copyright 1998-2007 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/_doCall.cpp.incl"
+#ifndef PRODUCT
+void trace_type_profile(ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
+if (TraceTypeProfile || PrintInlining || PrintOptoInlining) {
+tty->print("   ");
+for( int i = 0; i < depth; i++ ) tty->print("  ");
+if (!PrintOpto) {
+method->print_short_name();
+tty->print(" ->");
+}
+tty->print(" @ %d  ", bci);
+prof_method->print_short_name();
+tty->print("  >>TypeProfile (%d/%d counts) = ", receiver_count, site_count);
+prof_klass->name()->print_symbol();
+tty->print_cr(" (%d bytes)", prof_method->code_size());
+}
+}
+#endif
+CallGenerator* Compile::call_generator(ciMethod* call_method, int vtable_index, bool call_is_virtual, JVMState* jvms, bool allow_inline, float prof_factor) {
+CallGenerator* cg;
+// Dtrace currently doesn't work unless all calls are vanilla
+if (DTraceMethodProbes) {
+allow_inline = false;
+}
+// Note: When we get profiling during stage-1 compiles, we want to pull
+// from more specific profile data which pertains to this inlining.
+// Right now, ignore the information in jvms->caller(), and do method[bci].
+ciCallProfile profile = jvms->method()->call_profile_at_bci(jvms->bci());
+// See how many times this site has been invoked.
+int site_count = profile.count();
+int receiver_count = -1;
+if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) {
+// Receivers in the profile structure are ordered by call counts
+// so that the most called (major) receiver is profile.receiver(0).
+receiver_count = profile.receiver_count(0);
+}
+CompileLog* log = this->log();
+if (log != NULL) {
+int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
+int r2id = (profile.morphism() == 2)? log->identify(profile.receiver(1)):-1;
+log->begin_elem("call method='%d' count='%d' prof_factor='%g'",
+log->identify(call_method), site_count, prof_factor);
+if (call_is_virtual)  log->print(" virtual='1'");
+if (allow_inline)     log->print(" inline='1'");
+if (receiver_count >= 0) {
+log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
+if (profile.has_receiver(1)) {
+log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
+}
+}
+log->end_elem();
+}
+// Special case the handling of certain common, profitable library
+// methods.  If these methods are replaced with specialized code,
+// then we return it as the inlined version of the call.
+// We do this before the strict f.p. check below because the
+// intrinsics handle strict f.p. correctly.
+if (allow_inline) {
+cg = find_intrinsic(call_method, call_is_virtual);
+if (cg != NULL)  return cg;
+}
+// Do not inline strict fp into non-strict code, or the reverse
+bool caller_method_is_strict = jvms->method()->is_strict();
+if( caller_method_is_strict ^ call_method->is_strict() ) {
+allow_inline = false;
+}
+// Attempt to inline...
+if (allow_inline) {
+// The profile data is only partly attributable to this caller,
+// scale back the call site information.
+float past_uses = jvms->method()->scale_count(site_count, prof_factor);
+// This is the number of times we expect the call code to be used.
+float expected_uses = past_uses;
+// Try inlining a bytecoded method:
+if (!call_is_virtual) {
+InlineTree* ilt;
+if (UseOldInlining) {
+ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
+} else {
+// Make a disembodied, stateless ILT.
+// TO DO:  When UseOldInlining is removed, copy the ILT code elsewhere.
+float site_invoke_ratio = prof_factor;
+// Note:  ilt is for the root of this parse, not the present call site.
+ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio);
+}
+WarmCallInfo scratch_ci;
+if (!UseOldInlining)
+scratch_ci.init(jvms, call_method, profile, prof_factor);
+WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci);
+assert(ci != &scratch_ci, "do not let this pointer escape");
+bool allow_inline   = (ci != NULL && !ci->is_cold());
+bool require_inline = (allow_inline && ci->is_hot());
+if (allow_inline) {
+CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses);
+if (cg == NULL) {
+// Fall through.
+} else if (require_inline || !InlineWarmCalls) {
+return cg;
+} else {
+CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor);
+return CallGenerator::for_warm_call(ci, cold_cg, cg);
+}
+}
+}
+// Try using the type profile.
+if (call_is_virtual && site_count > 0 && receiver_count > 0) {
+// The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
+bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
+ciMethod* receiver_method = NULL;
+if (have_major_receiver || profile.morphism() == 1 ||
+(profile.morphism() == 2 && UseBimorphicInlining)) {
+// receiver_method = profile.method();
+// Profiles do not suggest methods now.  Look it up in the major receiver.
+receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
+profile.receiver(0));
+}
+if (receiver_method != NULL) {
+// The single majority receiver sufficiently outweighs the minority.
+CallGenerator* hit_cg = this->call_generator(receiver_method,
+vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor);
+if (hit_cg != NULL) {
+// Look up second receiver.
+CallGenerator* next_hit_cg = NULL;
+ciMethod* next_receiver_method = NULL;
+if (profile.morphism() == 2 && UseBimorphicInlining) {
+next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
+profile.receiver(1));
+if (next_receiver_method != NULL) {
+next_hit_cg = this->call_generator(next_receiver_method,
+vtable_index, !call_is_virtual, jvms,
+allow_inline, prof_factor);
+if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
+have_major_receiver && UseOnlyInlinedBimorphic) {
+// Skip if we can't inline second receiver's method
+next_hit_cg = NULL;
+}
+}
+}
+CallGenerator* miss_cg;
+if (( profile.morphism() == 1 ||
+(profile.morphism() == 2 && next_hit_cg != NULL) ) &&
+!too_many_traps(Deoptimization::Reason_class_check)
+// Check only total number of traps per method to allow
+// the transition from monomorphic to bimorphic case between
+// compilations without falling into virtual call.
+// A monomorphic case may have the class_check trap flag is set
+// due to the time gap between the uncommon trap processing
+// when flags are set in MDO and the call site bytecode execution
+// in Interpreter when MDO counters are updated.
+// There was also class_check trap in monomorphic case due to
+// the bug 6225440.
+) {
+// Generate uncommon trap for class check failure path
+// in case of monomorphic or bimorphic virtual call site.
+miss_cg = CallGenerator::for_uncommon_trap(call_method,
+Deoptimization::Reason_class_check,
+Deoptimization::Action_maybe_recompile);
+} else {
+// Generate virtual call for class check failure path
+// in case of polymorphic virtual call site.
+miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index);
+}
+if (miss_cg != NULL) {
+if (next_hit_cg != NULL) {
+NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth(), jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)));
+// We don't need to record dependency on a receiver here and below.
+// Whenever we inline, the dependency is added by Parse::Parse().
+miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
+}
+if (miss_cg != NULL) {
+NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth(), jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count));
+cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0));
+if (cg != NULL)  return cg;
+}
+}
+}
+}
+}
+}
+// There was no special inlining tactic, or it bailed out.
+// Use a more generic tactic, like a simple call.
+if (call_is_virtual) {
+return CallGenerator::for_virtual_call(call_method, vtable_index);
+} else {
+// Class Hierarchy Analysis or Type Profile reveals a unique target,
+// or it is a static or special call.
+return CallGenerator::for_direct_call(call_method);
+}
+}
+// uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
+bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
+// Additional inputs to consider...
+// bc      = bc()
+// caller  = method()
+// iter().get_method_holder_index()
+assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
+// Interface classes can be loaded & linked and never get around to
+// being initialized.  Uncommon-trap for not-initialized static or
+// v-calls.  Let interface calls happen.
+ciInstanceKlass* holder_klass  = dest_method->holder();
+if (!holder_klass->is_initialized() &&
+!holder_klass->is_interface()) {
+uncommon_trap(Deoptimization::Reason_uninitialized,
+Deoptimization::Action_reinterpret,
+holder_klass);
+return true;
+}
+assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility");
+return false;
+}
+//------------------------------do_call----------------------------------------
+// Handle your basic call.  Inline if we can & want to, else just setup call.
+void Parse::do_call() {
+// It's likely we are going to add debug info soon.
+// Also, if we inline a guy who eventually needs debug info for this JVMS,
+// our contribution to it is cleaned up right here.
+kill_dead_locals();
+// Set frequently used booleans
+bool is_virtual = bc() == Bytecodes::_invokevirtual;
+bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
+bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial;
+// Find target being called
+bool             will_link;
+ciMethod*        dest_method   = iter().get_method(will_link);
+ciInstanceKlass* holder_klass  = dest_method->holder();
+ciKlass* holder = iter().get_declared_method_holder();
+ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
+int   nargs    = dest_method->arg_size();
+// uncommon-trap when callee is unloaded, uninitialized or will not link
+// bailout when too many arguments for register representation
+if (!will_link || can_not_compile_call_site(dest_method, klass)) {
+#ifndef PRODUCT
+if (PrintOpto && (Verbose || WizardMode)) {
+method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
+dest_method->print_name(); tty->cr();
+}
+#endif
+return;
+}
+assert(holder_klass->is_loaded(), "");
+assert(dest_method->is_static() == !has_receiver, "must match bc");
+// Note: this takes into account invokeinterface of methods declared in java/lang/Object,
+// which should be invokevirtuals but according to the VM spec may be invokeinterfaces
+assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
+// Note:  In the absence of miranda methods, an abstract class K can perform
+// an invokevirtual directly on an interface method I.m if K implements I.
+// ---------------------
+// Does Class Hierarchy Analysis reveal only a single target of a v-call?
+// Then we may inline or make a static call, but become dependent on there being only 1 target.
+// Does the call-site type profile reveal only one receiver?
+// Then we may introduce a run-time check and inline on the path where it succeeds.
+// The other path may uncommon_trap, check for another receiver, or do a v-call.
+// Choose call strategy.
+bool call_is_virtual = is_virtual_or_interface;
+int vtable_index = methodOopDesc::invalid_vtable_index;
+ciMethod* call_method = dest_method;
+// Try to get the most accurate receiver type
+if (is_virtual_or_interface) {
+Node*             receiver_node = stack(sp() - nargs);
+const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
+ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type);
+// Have the call been sufficiently improved such that it is no longer a virtual?
+if (optimized_virtual_method != NULL) {
+call_method     = optimized_virtual_method;
+call_is_virtual = false;
+} else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) {
+// We can make a vtable call at this site
+vtable_index = call_method->resolve_vtable_index(method()->holder(), klass);
+}
+}
+// Note:  It's OK to try to inline a virtual call.
+// The call generator will not attempt to inline a polymorphic call
+// unless it knows how to optimize the receiver dispatch.
+bool try_inline = (C->do_inlining() || InlineAccessors);
+// ---------------------
+inc_sp(- nargs);              // Temporarily pop args for JVM state of call
+JVMState* jvms = sync_jvms();
+// ---------------------
+// Decide call tactic.
+// This call checks with CHA, the interpreter profile, intrinsics table, etc.
+// It decides whether inlining is desirable or not.
+CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
+// ---------------------
+// Round double arguments before call
+round_double_arguments(dest_method);
+#ifndef PRODUCT
+// bump global counters for calls
+count_compiled_calls(false/*at_method_entry*/, cg->is_inline());
+// Record first part of parsing work for this call
+parse_histogram()->record_change();
+#endif // not PRODUCT
+assert(jvms == this->jvms(), "still operating on the right JVMS");
+assert(jvms_in_sync(),       "jvms must carry full info into CG");
+// save across call, for a subsequent cast_not_null.
+Node* receiver = has_receiver ? argument(0) : NULL;
+// Bump method data counters (We profile *before* the call is made
+// because exceptions don't return to the call site.)
+profile_call(receiver);
+JVMState* new_jvms;
+if ((new_jvms = cg->generate(jvms)) == NULL) {
+// When inlining attempt fails (e.g., too many arguments),
+// it may contaminate the current compile state, making it
+// impossible to pull back and try again.  Once we call
+// cg->generate(), we are committed.  If it fails, the whole
+// compilation task is compromised.
+if (failing())  return;
+#ifndef PRODUCT
+if (PrintOpto || PrintOptoInlining || PrintInlining) {
+// Only one fall-back, so if an intrinsic fails, ignore any bytecodes.
+if (cg->is_intrinsic() && call_method->code_size() > 0) {
+tty->print("Bailed out of intrinsic, will not inline: ");
+call_method->print_name(); tty->cr();
+}
+}
+#endif
+// This can happen if a library intrinsic is available, but refuses
+// the call site, perhaps because it did not match a pattern the
+// intrinsic was expecting to optimize.  The fallback position is
+// to call out-of-line.
+try_inline = false;  // Inline tactic bailed out.
+cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
+if ((new_jvms = cg->generate(jvms)) == NULL) {
+guarantee(failing(), "call failed to generate:  calls should work");
+return;
+}
+}
+if (cg->is_inline()) {
+C->env()->notice_inlined_method(call_method);
+}
+// Reset parser state from [new_]jvms, which now carries results of the call.
+// Return value (if any) is already pushed on the stack by the cg.
+add_exception_states_from(new_jvms);
+if (new_jvms->map()->control() == top()) {
+stop_and_kill_map();
+} else {
+assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
+set_jvms(new_jvms);
+}
+if (!stopped()) {
+// This was some sort of virtual call, which did a null check for us.
+// Now we can assert receiver-not-null, on the normal return path.
+if (receiver != NULL && cg->is_virtual()) {
+Node* cast = cast_not_null(receiver);
+// %%% assert(receiver == cast, "should already have cast the receiver");
+}
+// Round double result after a call from strict to non-strict code
+round_double_result(dest_method);
+// If the return type of the method is not loaded, assert that the
+// value we got is a null.  Otherwise, we need to recompile.
+if (!dest_method->return_type()->is_loaded()) {
+#ifndef PRODUCT
+if (PrintOpto && (Verbose || WizardMode)) {
+method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
+dest_method->print_name(); tty->cr();
+}
+#endif
+if (C->log() != NULL) {
+C->log()->elem("assert_null reason='return' klass='%d'",
+C->log()->identify(dest_method->return_type()));
+}
+// If there is going to be a trap, put it at the next bytecode:
+set_bci(iter().next_bci());
+do_null_assert(peek(), T_OBJECT);
+set_bci(iter().cur_bci()); // put it back
+}
+}
+// Restart record of parsing work after possible inlining of call
+#ifndef PRODUCT
+parse_histogram()->set_initial_state(bc());
+#endif
+}
+//---------------------------catch_call_exceptions-----------------------------
+// Put a Catch and CatchProj nodes behind a just-created call.
+// Send their caught exceptions to the proper handler.
+// This may be used after a call to the rethrow VM stub,
+// when it is needed to process unloaded exception classes.
+void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
+// Exceptions are delivered through this channel:
+Node* i_o = this->i_o();
+// Add a CatchNode.
+GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
+GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
+GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
+for (; !handlers.is_done(); handlers.next()) {
+ciExceptionHandler* h        = handlers.handler();
+int                 h_bci    = h->handler_bci();
+ciInstanceKlass*    h_klass  = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
+// Do not introduce unloaded exception types into the graph:
+if (!h_klass->is_loaded()) {
+if (saw_unloaded->contains(h_bci)) {
+/* We've already seen an unloaded exception with h_bci,
+so don't duplicate. Duplication will cause the CatchNode to be
+unnecessarily large. See 4713716. */
+continue;
+} else {
+saw_unloaded->append(h_bci);
+}
+}
+const Type*         h_extype = TypeOopPtr::make_from_klass(h_klass);
+// (We use make_from_klass because it respects UseUniqueSubclasses.)
+h_extype = h_extype->join(TypeInstPtr::NOTNULL);
+assert(!h_extype->empty(), "sanity");
+// Note:  It's OK if the BCIs repeat themselves.
+bcis->append(h_bci);
+extypes->append(h_extype);
+}
+int len = bcis->length();
+CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1);
+Node *catch_ = _gvn.transform(cn);
+// now branch with the exception state to each of the (potential)
+// handlers
+for(int i=0; i < len; i++) {
+// Setup JVM state to enter the handler.
+PreserveJVMState pjvms(this);
+// Locals are just copied from before the call.
+// Get control from the CatchNode.
+int handler_bci = bcis->at(i);
+Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci));
+// This handler cannot happen?
+if (ctrl == top())  continue;
+set_control(ctrl);
+// Create exception oop
+const TypeInstPtr* extype = extypes->at(i)->is_instptr();
+Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o));
+// Handle unloaded exception classes.
+if (saw_unloaded->contains(handler_bci)) {
+// An unloaded exception type is coming here.  Do an uncommon trap.
+#ifndef PRODUCT
+// We do not expect the same handler bci to take both cold unloaded
+// and hot loaded exceptions.  But, watch for it.
+if (extype->is_loaded()) {
+tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ");
+method()->print_name(); tty->cr();
+} else if (PrintOpto && (Verbose || WizardMode)) {
+tty->print("Bailing out on unloaded exception type ");
+extype->klass()->print_name();
+tty->print(" at bci:%d in ", bci());
+method()->print_name(); tty->cr();
+}
+#endif
+// Emit an uncommon trap instead of processing the block.
+set_bci(handler_bci);
+push_ex_oop(ex_oop);
+uncommon_trap(Deoptimization::Reason_unloaded,
+Deoptimization::Action_reinterpret,
+extype->klass(), "!loaded exception");
+set_bci(iter().cur_bci()); // put it back
+continue;
+}
+// go to the exception handler
+if (handler_bci < 0) {     // merge with corresponding rethrow node
+throw_to_exit(make_exception_state(ex_oop));
+} else {                      // Else jump to corresponding handle
+push_ex_oop(ex_oop);        // Clear stack and push just the oop.
+merge_exception(handler_bci);
+}
+}
+// The first CatchProj is for the normal return.
+// (Note:  If this is a call to rethrow_Java, this node goes dead.)
+set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
+}
+//----------------------------catch_inline_exceptions--------------------------
+// Handle all exceptions thrown by an inlined method or individual bytecode.
+// Common case 1: we have no handler, so all exceptions merge right into
+// the rethrow case.
+// Case 2: we have some handlers, with loaded exception klasses that have
+// no subklasses.  We do a Deutsch-Shiffman style type-check on the incoming
+// exception oop and branch to the handler directly.
+// Case 3: We have some handlers with subklasses or are not loaded at
+// compile-time.  We have to call the runtime to resolve the exception.
+// So we insert a RethrowCall and all the logic that goes with it.
+void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
+// Caller is responsible for saving away the map for normal control flow!
+assert(stopped(), "call set_map(NULL) first");
+assert(method()->has_exception_handlers(), "don't come here w/o work to do");
+Node* ex_node = saved_ex_oop(ex_map);
+if (ex_node == top()) {
+// No action needed.
+return;
+}
+const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
+NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
+if (ex_type == NULL)
+ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
+// determine potential exception handlers
+ciExceptionHandlerStream handlers(method(), bci(),
+ex_type->klass()->as_instance_klass(),
+ex_type->klass_is_exact());
+// Start executing from the given throw state.  (Keep its stack, for now.)
+// Get the exception oop as known at compile time.
+ex_node = use_exception_state(ex_map);
+// Get the exception oop klass from its header
+Node* ex_klass_node = NULL;
+if (has_ex_handler() && !ex_type->klass_is_exact()) {
+Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
+ex_klass_node = _gvn.transform(new (C, 3) LoadKlassNode(NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT));
+// Compute the exception klass a little more cleverly.
+// Obvious solution is to simple do a LoadKlass from the 'ex_node'.
+// However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
+// each arm of the Phi.  If I know something clever about the exceptions
+// I'm loading the class from, I can replace the LoadKlass with the
+// klass constant for the exception oop.
+if( ex_node->is_Phi() ) {
+ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT );
+for( uint i = 1; i < ex_node->req(); i++ ) {
+Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() );
+Node* k = _gvn.transform(new (C, 3) LoadKlassNode(0, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT));
+ex_klass_node->init_req( i, k );
+}
+_gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
+}
+}
+// Scan the exception table for applicable handlers.
+// If none, we can call rethrow() and be done!
+// If precise (loaded with no subklasses), insert a D.S. style
+// pointer compare to the correct handler and loop back.
+// If imprecise, switch to the Rethrow VM-call style handling.
+int remaining = handlers.count_remaining();
+// iterate through all entries sequentially
+for (;!handlers.is_done(); handlers.next()) {
+// Do nothing if turned off
+if( !DeutschShiffmanExceptions ) break;
+ciExceptionHandler* handler = handlers.handler();
+if (handler->is_rethrow()) {
+// If we fell off the end of the table without finding an imprecise
+// exception klass (and without finding a generic handler) then we
+// know this exception is not handled in this method.  We just rethrow
+// the exception into the caller.
+throw_to_exit(make_exception_state(ex_node));
+return;
+}
+// exception handler bci range covers throw_bci => investigate further
+int handler_bci = handler->handler_bci();
+if (remaining == 1) {
+push_ex_oop(ex_node);        // Push exception oop for handler
+#ifndef PRODUCT
+if (PrintOpto && WizardMode) {
+tty->print_cr("  Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
+}
+#endif
+merge_exception(handler_bci); // jump to handler
+return;                   // No more handling to be done here!
+}
+// %%% The following logic replicates make_from_klass_unique.
+// TO DO:  Replace by a subroutine call.  Then generalize
+// the type check, as noted in the next "%%%" comment.
+ciInstanceKlass* klass = handler->catch_klass();
+if (UseUniqueSubclasses) {
+// (We use make_from_klass because it respects UseUniqueSubclasses.)
+const TypeOopPtr* tp = TypeOopPtr::make_from_klass(klass);
+klass = tp->klass()->as_instance_klass();
+}
+// Get the handler's klass
+if (!klass->is_loaded())    // klass is not loaded?
+break;                    // Must call Rethrow!
+if (klass->is_interface())  // should not happen, but...
+break;                    // bail out
+// See if the loaded exception klass has no subtypes
+if (klass->has_subklass())
+break;                    // Cannot easily do precise test ==> Rethrow
+// %%% Now that subclass checking is very fast, we need to rewrite
+// this section and remove the option "DeutschShiffmanExceptions".
+// The exception processing chain should be a normal typecase pattern,
+// with a bailout to the interpreter only in the case of unloaded
+// classes.  (The bailout should mark the method non-entrant.)
+// This rewrite should be placed in GraphKit::, not Parse::.
+// Add a dependence; if any subclass added we need to recompile
+// %%% should use stronger assert_unique_concrete_subtype instead
+if (!klass->is_final()) {
+C->dependencies()->assert_leaf_type(klass);
+}
+// Implement precise test
+const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
+Node* con = _gvn.makecon(tk);
+Node* cmp = _gvn.transform( new (C, 3) CmpPNode(ex_klass_node, con) );
+Node* bol = _gvn.transform( new (C, 2) BoolNode(cmp, BoolTest::ne) );
+{ BuildCutout unless(this, bol, PROB_LIKELY(0.7f));
+const TypeInstPtr* tinst = TypeInstPtr::make_exact(TypePtr::NotNull, klass);
+Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst));
+push_ex_oop(ex_oop);      // Push exception oop for handler
+#ifndef PRODUCT
+if (PrintOpto && WizardMode) {
+tty->print("  Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
+klass->print_name();
+tty->cr();
+}
+#endif
+merge_exception(handler_bci);
+}
+// Come here if exception does not match handler.
+// Carry on with more handler checks.
+--remaining;
+}
+assert(!stopped(), "you should return if you finish the chain");
+if (remaining == 1) {
+// Further checks do not matter.
+}
+if (can_rerun_bytecode()) {
+// Do not push_ex_oop here!
+// Re-executing the bytecode will reproduce the throwing condition.
+bool must_throw = true;
+uncommon_trap(Deoptimization::Reason_unhandled,
+Deoptimization::Action_none,
+(ciKlass*)NULL, (const char*)NULL, // default args
+must_throw);
+return;
+}
+// Oops, need to call into the VM to resolve the klasses at runtime.
+// Note:  This call must not deoptimize, since it is not a real at this bci!
+kill_dead_locals();
+make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
+OptoRuntime::rethrow_Type(),
+OptoRuntime::rethrow_stub(),
+NULL, NULL,
+ex_node);
+// Rethrow is a pure call, no side effects, only a result.
+// The result cannot be allocated, so we use I_O
+// Catch exceptions from the rethrow
+catch_call_exceptions(handlers);
+}
+// (Note:  Moved add_debug_info into GraphKit::add_safepoint_edges.)
+#ifndef PRODUCT
+void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
+if( CountCompiledCalls ) {
+if( at_method_entry ) {
+// bump invocation counter if top method (for statistics)
+if (CountCompiledCalls && depth() == 1) {
+const TypeInstPtr* addr_type = TypeInstPtr::make(method());
+Node* adr1 = makecon(addr_type);
+Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset()));
+increment_counter(adr2);
+}
+} else if (is_inline) {
+switch (bc()) {
+case Bytecodes::_invokevirtual:   increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
+case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
+case Bytecodes::_invokestatic:
+case Bytecodes::_invokespecial:   increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
+default: fatal("unexpected call bytecode");
+}
+} else {
+switch (bc()) {
+case Bytecodes::_invokevirtual:   increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
+case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
+case Bytecodes::_invokestatic:
+case Bytecodes::_invokespecial:   increment_counter(SharedRuntime::nof_static_calls_addr()); break;
+default: fatal("unexpected call bytecode");
+}
+}
+}
+}
+#endif //PRODUCT
+// Identify possible target method and inlining style
+ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
+ciMethod *dest_method, const TypeOopPtr* receiver_type) {
+// only use for virtual or interface calls
+// If it is obviously final, do not bother to call find_monomorphic_target,
+// because the class hierarchy checks are not needed, and may fail due to
+// incompletely loaded classes.  Since we do our own class loading checks
+// in this module, we may confidently bind to any method.
+if (dest_method->can_be_statically_bound()) {
+return dest_method;
+}
+// Attempt to improve the receiver
+bool actual_receiver_is_exact = false;
+ciInstanceKlass* actual_receiver = klass;
+if (receiver_type != NULL) {
+// Array methods are all inherited from Object, and are monomorphic.
+if (receiver_type->isa_aryptr() &&
+dest_method->holder() == env()->Object_klass()) {
+return dest_method;
+}
+// All other interesting cases are instance klasses.
+if (!receiver_type->isa_instptr()) {
+return NULL;
+}
+ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
+if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
+(ikl == actual_receiver || ikl->is_subclass_of(actual_receiver))) {
+// ikl is a same or better type than the original actual_receiver,
+// e.g. static receiver from bytecodes.
+actual_receiver = ikl;
+// Is the actual_receiver exact?
+actual_receiver_is_exact = receiver_type->klass_is_exact();
+}
+}
+ciInstanceKlass*   calling_klass = caller->holder();
+ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver);
+if (cha_monomorphic_target != NULL) {
+assert(!cha_monomorphic_target->is_abstract(), "");
+// Look at the method-receiver type.  Does it add "too much information"?
+ciKlass*    mr_klass = cha_monomorphic_target->holder();
+const Type* mr_type  = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
+if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
+// Calling this method would include an implicit cast to its holder.
+// %%% Not yet implemented.  Would throw minor asserts at present.
+// %%% The most common wins are already gained by +UseUniqueSubclasses.
+// To fix, put the higher_equal check at the call of this routine,
+// and add a CheckCastPP to the receiver.
+if (TraceDependencies) {
+tty->print_cr("found unique CHA method, but could not cast up");
+tty->print("  method  = ");
+cha_monomorphic_target->print();
+tty->cr();
+}
+if (C->log() != NULL) {
+C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
+C->log()->identify(klass),
+C->log()->identify(cha_monomorphic_target));
+}
+cha_monomorphic_target = NULL;
+}
+}
+if (cha_monomorphic_target != NULL) {
+// Hardwiring a virtual.
+// If we inlined because CHA revealed only a single target method,
+// then we are dependent on that target method not getting overridden
+// by dynamic class loading.  Be sure to test the "static" receiver
+// dest_method here, as opposed to the actual receiver, which may
+// falsely lead us to believe that the receiver is final or private.
+C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
+return cha_monomorphic_target;
+}
+// If the type is exact, we can still bind the method w/o a vcall.
+// (This case comes after CHA so we can see how much extra work it does.)
+if (actual_receiver_is_exact) {
+// In case of evolution, there is a dependence on every inlined method, since each
+// such method can be changed when its class is redefined.
+ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver);
+if (exact_method != NULL) {
+#ifndef PRODUCT
+if (PrintOpto) {
+tty->print("  Calling method via exact type @%d --- ", bci);
+exact_method->print_name();
+tty->cr();
+}
+#endif
+return exact_method;
+}
+}
+return NULL;
+}

Mercurial > hg > truffle

comparison src/share/vm/opto/doCall.cpp @ 0:a61af66fc99e jdk7-b24