JDK14/Java14源码在线阅读
/*
* Copyright (c) 1998, 2019, 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
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*/
#include "precompiled.hpp"
#include "ci/ciCallSite.hpp"
#include "ci/ciMethodHandle.hpp"
#include "classfile/vmSymbols.hpp"
#include "compiler/compileBroker.hpp"
#include "compiler/compileLog.hpp"
#include "interpreter/linkResolver.hpp"
#include "opto/addnode.hpp"
#include "opto/callGenerator.hpp"
#include "opto/castnode.hpp"
#include "opto/cfgnode.hpp"
#include "opto/mulnode.hpp"
#include "opto/parse.hpp"
#include "opto/rootnode.hpp"
#include "opto/runtime.hpp"
#include "opto/subnode.hpp"
#include "prims/nativeLookup.hpp"
#include "runtime/sharedRuntime.hpp"
void trace_type_profile(Compile* C, ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
if (TraceTypeProfile || C->print_inlining()) {
outputStream* out = tty;
if (!C->print_inlining()) {
if (!PrintOpto && !PrintCompilation) {
method->print_short_name();
tty->cr();
}
CompileTask::print_inlining_tty(prof_method, depth, bci);
} else {
out = C->print_inlining_stream();
}
CompileTask::print_inline_indent(depth, out);
out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count);
stringStream ss;
prof_klass->name()->print_symbol_on(&ss);
out->print("%s", ss.as_string());
out->cr();
}
}
CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch,
JVMState* jvms, bool allow_inline,
float prof_factor, ciKlass* speculative_receiver_type,
bool allow_intrinsics, bool delayed_forbidden) {
ciMethod* caller = jvms->method();
int bci = jvms->bci();
Bytecodes::Code bytecode = caller->java_code_at_bci(bci);
guarantee(callee != NULL, "failed method resolution");
// Dtrace currently doesn't work unless all calls are vanilla
if (env()->dtrace_method_probes()) {
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 = caller->call_profile_at_bci(bci);
// See how many times this site has been invoked.
int site_count = profile.count();
int receiver_count = -1;
if (call_does_dispatch && 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 = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
log->begin_elem("call method='%d' count='%d' prof_factor='%f'",
log->identify(callee), site_count, prof_factor);
if (call_does_dispatch) 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));
}
}
if (callee->is_method_handle_intrinsic()) {
log->print(" method_handle_intrinsic='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.
CallGenerator* cg_intrinsic = NULL;
if (allow_inline && allow_intrinsics) {
CallGenerator* cg = find_intrinsic(callee, call_does_dispatch);
if (cg != NULL) {
if (cg->is_predicated()) {
// Code without intrinsic but, hopefully, inlined.
CallGenerator* inline_cg = this->call_generator(callee,
vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, speculative_receiver_type, false);
if (inline_cg != NULL) {
cg = CallGenerator::for_predicated_intrinsic(cg, inline_cg);
}
}
// If intrinsic does the virtual dispatch, we try to use the type profile
// first, and hopefully inline it as the regular virtual call below.
// We will retry the intrinsic if nothing had claimed it afterwards.
if (cg->does_virtual_dispatch()) {
cg_intrinsic = cg;
cg = NULL;
} else {
return cg;
}
}
}
// Do method handle calls.
// NOTE: This must happen before normal inlining logic below since
// MethodHandle.invoke* are native methods which obviously don't
// have bytecodes and so normal inlining fails.
if (callee->is_method_handle_intrinsic()) {
CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, delayed_forbidden);
assert(cg == NULL || !delayed_forbidden || !cg->is_late_inline() || cg->is_mh_late_inline(), "unexpected CallGenerator");
return cg;
}
// Do not inline strict fp into non-strict code, or the reverse
if (caller->is_strict() ^ callee->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_does_dispatch) {
InlineTree* ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
WarmCallInfo scratch_ci;
bool should_delay = false;
WarmCallInfo* ci = ilt->ok_to_inline(callee, jvms, profile, &scratch_ci, should_delay);
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(callee, expected_uses);
if (require_inline && cg != NULL) {
// Delay the inlining of this method to give us the
// opportunity to perform some high level optimizations
// first.
if (should_delay_string_inlining(callee, jvms)) {
assert(!delayed_forbidden, "strange");
return CallGenerator::for_string_late_inline(callee, cg);
} else if (should_delay_boxing_inlining(callee, jvms)) {
assert(!delayed_forbidden, "strange");
return CallGenerator::for_boxing_late_inline(callee, cg);
} else if ((should_delay || AlwaysIncrementalInline) && !delayed_forbidden) {
return CallGenerator::for_late_inline(callee, cg);
}
}
if (cg == NULL || should_delay) {
// Fall through.
} else if (require_inline || !InlineWarmCalls) {
return cg;
} else {
CallGenerator* cold_cg = call_generator(callee, vtable_index, call_does_dispatch, jvms, false, prof_factor);
return CallGenerator::for_warm_call(ci, cold_cg, cg);
}
}
}
// Try using the type profile.
if (call_does_dispatch && site_count > 0 && UseTypeProfile) {
// The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
bool have_major_receiver = profile.has_receiver(0) && (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
ciMethod* receiver_method = NULL;
int morphism = profile.morphism();
if (speculative_receiver_type != NULL) {
if (!too_many_traps_or_recompiles(caller, bci, Deoptimization::Reason_speculate_class_check)) {
// We have a speculative type, we should be able to resolve
// the call. We do that before looking at the profiling at
// this invoke because it may lead to bimorphic inlining which
// a speculative type should help us avoid.
receiver_method = callee->resolve_invoke(jvms->method()->holder(),
speculative_receiver_type);
if (receiver_method == NULL) {
speculative_receiver_type = NULL;
} else {
morphism = 1;
}
} else {
// speculation failed before. Use profiling at the call
// (could allow bimorphic inlining for instance).
speculative_receiver_type = NULL;
}
}
if (receiver_method == NULL &&
(have_major_receiver || morphism == 1 ||
(morphism == 2 && UseBimorphicInlining))) {
// receiver_method = profile.method();
// Profiles do not suggest methods now. Look it up in the major receiver.
receiver_method = callee->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_does_dispatch, jvms, allow_inline, prof_factor);
if (hit_cg != NULL) {
// Look up second receiver.
CallGenerator* next_hit_cg = NULL;
ciMethod* next_receiver_method = NULL;
if (morphism == 2 && UseBimorphicInlining) {
next_receiver_method = callee->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_does_dispatch, 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;
Deoptimization::DeoptReason reason = (morphism == 2
? Deoptimization::Reason_bimorphic
: Deoptimization::reason_class_check(speculative_receiver_type != NULL));
if ((morphism == 1 || (morphism == 2 && next_hit_cg != NULL)) &&
!too_many_traps_or_recompiles(caller, bci, reason)
) {
// Generate uncommon trap for class check failure path
// in case of monomorphic or bimorphic virtual call site.
miss_cg = CallGenerator::for_uncommon_trap(callee, reason,
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(callee, vtable_index);
}
if (miss_cg != NULL) {
if (next_hit_cg != NULL) {
assert(speculative_receiver_type == NULL, "shouldn't end up here if we used speculation");
trace_type_profile(C, jvms->method(), jvms->depth() - 1, 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) {
ciKlass* k = speculative_receiver_type != NULL ? speculative_receiver_type : profile.receiver(0);
trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, k, site_count, receiver_count);
float hit_prob = speculative_receiver_type != NULL ? 1.0 : profile.receiver_prob(0);
CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob);
if (cg != NULL) return cg;
}
}
}
}
}
// If there is only one implementor of this interface then we
// may be able to bind this invoke directly to the implementing
// klass but we need both a dependence on the single interface
// and on the method we bind to. Additionally since all we know
// about the receiver type is that it's supposed to implement the
// interface we have to insert a check that it's the class we
// expect. Interface types are not checked by the verifier so
// they are roughly equivalent to Object.
// The number of implementors for declared_interface is less or
// equal to the number of implementors for target->holder() so
// if number of implementors of target->holder() == 1 then
// number of implementors for decl_interface is 0 or 1. If
// it's 0 then no class implements decl_interface and there's
// no point in inlining.
if (call_does_dispatch && bytecode == Bytecodes::_invokeinterface) {
ciInstanceKlass* declared_interface =
caller->get_declared_method_holder_at_bci(bci)->as_instance_klass();
ciInstanceKlass* singleton = declared_interface->unique_implementor();
if (singleton != NULL &&
(!callee->is_default_method() || callee->is_overpass()) /* CHA doesn't support default methods yet */) {
assert(singleton != declared_interface, "not a unique implementor");
ciMethod* cha_monomorphic_target =
callee->find_monomorphic_target(caller->holder(), declared_interface, singleton);
if (cha_monomorphic_target != NULL &&
cha_monomorphic_target->holder() != env()->Object_klass()) { // subtype check against Object is useless
ciKlass* holder = cha_monomorphic_target->holder();
// Try to inline the method found by CHA. Inlined method is guarded by the type check.
CallGenerator* hit_cg = call_generator(cha_monomorphic_target,
vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
// Deoptimize on type check fail. The interpreter will throw ICCE for us.
CallGenerator* miss_cg = CallGenerator::for_uncommon_trap(callee,
Deoptimization::Reason_class_check, Deoptimization::Action_none);
CallGenerator* cg = CallGenerator::for_guarded_call(holder, miss_cg, hit_cg);
if (hit_cg != NULL && cg != NULL) {
dependencies()->assert_unique_concrete_method(declared_interface, cha_monomorphic_target);
return cg;
}
}
}
}
}
// Nothing claimed the intrinsic, we go with straight-forward inlining
// for already discovered intrinsic.
if (allow_inline && allow_intrinsics && cg_intrinsic != NULL) {
assert(cg_intrinsic->does_virtual_dispatch(), "sanity");
return cg_intrinsic;
}
// There was no special inlining tactic, or it bailed out.
// Use a more generic tactic, like a simple call.
if (call_does_dispatch) {
const char* msg = "virtual call";
if (PrintInlining) print_inlining(callee, jvms->depth() - 1, jvms->bci(), msg);
C->log_inline_failure(msg);
return CallGenerator::for_virtual_call(callee, 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(callee, should_delay_inlining(callee, jvms));
}
}
// Return true for methods that shouldn't be inlined early so that
// they are easier to analyze and optimize as intrinsics.
bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) {
if (has_stringbuilder()) {
if ((call_method->holder() == C->env()->StringBuilder_klass() ||
call_method->holder() == C->env()->StringBuffer_klass()) &&
(jvms->method()->holder() == C->env()->StringBuilder_klass() ||
jvms->method()->holder() == C->env()->StringBuffer_klass())) {
// Delay SB calls only when called from non-SB code
return false;
}
switch (call_method->intrinsic_id()) {
case vmIntrinsics::_StringBuilder_void:
case vmIntrinsics::_StringBuilder_int:
case vmIntrinsics::_StringBuilder_String:
case vmIntrinsics::_StringBuilder_append_char:
case vmIntrinsics::_StringBuilder_append_int:
case vmIntrinsics::_StringBuilder_append_String:
case vmIntrinsics::_StringBuilder_toString:
case vmIntrinsics::_StringBuffer_void:
case vmIntrinsics::_StringBuffer_int:
case vmIntrinsics::_StringBuffer_String:
case vmIntrinsics::_StringBuffer_append_char:
case vmIntrinsics::_StringBuffer_append_int:
case vmIntrinsics::_StringBuffer_append_String:
case vmIntrinsics::_StringBuffer_toString:
case vmIntrinsics::_Integer_toString:
return true;
case vmIntrinsics::_String_String:
{
Node* receiver = jvms->map()->in(jvms->argoff() + 1);
if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
ciMethod* m = csj->method();
if (m != NULL &&
(m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
// Delay String.<init>(new SB())
return true;
}
return false;
}
default:
return false;
}
}
return false;
}
bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) {
if (eliminate_boxing() && call_method->is_boxing_method()) {
set_has_boxed_value(true);
return aggressive_unboxing();
}
return false;
}
// 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_being_initialized() &&
!holder_klass->is_initialized() &&
!holder_klass->is_interface()) {
uncommon_trap(Deoptimization::Reason_uninitialized,
Deoptimization::Action_reinterpret,
holder_klass);
return true;
}
assert(dest_method->is_loaded(), "dest_method: typeflow responsibility");
return false;
}
#ifdef ASSERT
static bool check_call_consistency(JVMState* jvms, CallGenerator* cg) {
ciMethod* symbolic_info = jvms->method()->get_method_at_bci(jvms->bci());
ciMethod* resolved_method = cg->method();
if (!ciMethod::is_consistent_info(symbolic_info, resolved_method)) {
tty->print_cr("JVMS:");
jvms->dump();
tty->print_cr("Bytecode info:");
jvms->method()->get_method_at_bci(jvms->bci())->print(); tty->cr();
tty->print_cr("Resolved method:");
cg->method()->print(); tty->cr();
return false;
}
return true;
}
#endif // ASSERT
//------------------------------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();
C->print_inlining_assert_ready();
// Set frequently used booleans
const bool is_virtual = bc() == Bytecodes::_invokevirtual;
const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
const bool has_receiver = Bytecodes::has_receiver(bc());
// Find target being called
bool will_link;
ciSignature* declared_signature = NULL;
ciMethod* orig_callee = iter().get_method(will_link, &declared_signature); // callee in the bytecode
ciInstanceKlass* holder_klass = orig_callee->holder();
ciKlass* holder = iter().get_declared_method_holder();
ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
assert(declared_signature != NULL, "cannot be null");
// Bump max node limit for JSR292 users
if (bc() == Bytecodes::_invokedynamic || orig_callee->is_method_handle_intrinsic()) {
C->set_max_node_limit(3*MaxNodeLimit);
}
// 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(orig_callee, klass)) {
if (PrintOpto && (Verbose || WizardMode)) {
method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
orig_callee->print_name(); tty->cr();
}
return;
}
assert(holder_klass->is_loaded(), "");
//assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); // XXX invokehandle (cur_bc_raw)
// 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.
// orig_callee is the resolved callee which's signature includes the
// appendix argument.
const int nargs = orig_callee->arg_size();
const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id());
// Push appendix argument (MethodType, CallSite, etc.), if one.
if (iter().has_appendix()) {
ciObject* appendix_arg = iter().get_appendix();
const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg, /* require_const= */ true);
Node* appendix_arg_node = _gvn.makecon(appendix_arg_type);
push(appendix_arg_node);
}
// ---------------------
// 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.
// Try to get the most accurate receiver type
ciMethod* callee = orig_callee;
int vtable_index = Method::invalid_vtable_index;
bool call_does_dispatch = false;
// Speculative type of the receiver if any
ciKlass* speculative_receiver_type = NULL;
if (is_virtual_or_interface) {
Node* receiver_node = stack(sp() - nargs);
const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
// call_does_dispatch and vtable_index are out-parameters. They might be changed.
// For arrays, klass below is Object. When vtable calls are used,
// resolving the call with Object would allow an illegal call to
// finalize() on an array. We use holder instead: illegal calls to
// finalize() won't be compiled as vtable calls (IC call
// resolution will catch the illegal call) and the few legal calls
// on array types won't be either.
callee = C->optimize_virtual_call(method(), bci(), klass, holder, orig_callee,
receiver_type, is_virtual,
call_does_dispatch, vtable_index); // out-parameters
speculative_receiver_type = receiver_type != NULL ? receiver_type->speculative_type() : NULL;
}
// Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
ciKlass* receiver_constraint = NULL;
if (iter().cur_bc_raw() == Bytecodes::_invokespecial && !orig_callee->is_object_initializer()) {
ciInstanceKlass* calling_klass = method()->holder();
ciInstanceKlass* sender_klass =
calling_klass->is_unsafe_anonymous() ? calling_klass->unsafe_anonymous_host() :
calling_klass;
if (sender_klass->is_interface()) {
receiver_constraint = sender_klass;
}
} else if (iter().cur_bc_raw() == Bytecodes::_invokeinterface && orig_callee->is_private()) {
assert(holder->is_interface(), "How did we get a non-interface method here!");
receiver_constraint = holder;
}
if (receiver_constraint != NULL) {
Node* receiver_node = stack(sp() - nargs);
Node* cls_node = makecon(TypeKlassPtr::make(receiver_constraint));
Node* bad_type_ctrl = NULL;
Node* casted_receiver = gen_checkcast(receiver_node, cls_node, &bad_type_ctrl);
if (bad_type_ctrl != NULL) {
PreserveJVMState pjvms(this);
set_control(bad_type_ctrl);
uncommon_trap(Deoptimization::Reason_class_check,
Deoptimization::Action_none);
}
if (stopped()) {
return; // MUST uncommon-trap?
}
set_stack(sp() - nargs, casted_receiver);
}
// 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);
// ---------------------
dec_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(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type);
// NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead.
orig_callee = callee = NULL;
// ---------------------
// Round double arguments before call
round_double_arguments(cg->method());
// Feed profiling data for arguments to the type system so it can
// propagate it as speculative types
record_profiled_arguments_for_speculation(cg->method(), bc());
#ifndef PRODUCT
// bump global counters for calls
count_compiled_calls(/*at_method_entry*/ false, 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;
// The extra CheckCastPPs for speculative types mess with PhaseStringOpts
if (receiver != NULL && !call_does_dispatch && !cg->is_string_late_inline()) {
// Feed profiling data for a single receiver to the type system so
// it can propagate it as a speculative type
receiver = record_profiled_receiver_for_speculation(receiver);
}
// 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 = cg->generate(jvms);
if (new_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;
// 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. Should always be possible to
// get a normal java call that may inline in that case
cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false);
new_jvms = cg->generate(jvms);
if (new_jvms == NULL) {
guarantee(failing(), "call failed to generate: calls should work");
return;
}
}
if (cg->is_inline()) {
// Accumulate has_loops estimate
C->set_has_loops(C->has_loops() || cg->method()->has_loops());
C->env()->notice_inlined_method(cg->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);
}
assert(check_call_consistency(jvms, cg), "inconsistent info");
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(cg->method());
ciType* rtype = cg->method()->return_type();
ciType* ctype = declared_signature->return_type();
if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) {
// Be careful here with return types.
if (ctype != rtype) {
BasicType rt = rtype->basic_type();
BasicType ct = ctype->basic_type();
if (ct == T_VOID) {
// It's OK for a method to return a value that is discarded.
// The discarding does not require any special action from the caller.
// The Java code knows this, at VerifyType.isNullConversion.
pop_node(rt); // whatever it was, pop it
} else if (rt == T_INT || is_subword_type(rt)) {
// Nothing. These cases are handled in lambda form bytecode.
assert(ct == T_INT || is_subword_type(ct), "must match: rt=%s, ct=%s", type2name(rt), type2name(ct));
} else if (is_reference_type(rt)) {
assert(is_reference_type(ct), "rt=%s, ct=%s", type2name(rt), type2name(ct));
if (ctype->is_loaded()) {
const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass());
const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
if (arg_type != NULL && !arg_type->higher_equal(sig_type)) {
Node* retnode = pop();
Node* cast_obj = _gvn.transform(new CheckCastPPNode(control(), retnode, sig_type));
push(cast_obj);
}
}
} else {
assert(rt == ct, "unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct));
// push a zero; it's better than getting an oop/int mismatch
pop_node(rt);
Node* retnode = zerocon(ct);
push_node(ct, retnode);
}
// Now that the value is well-behaved, continue with the call-site type.
rtype = ctype;
}
} else {
// Symbolic resolution enforces the types to be the same.
// NOTE: We must relax the assert for unloaded types because two
// different ciType instances of the same unloaded class type
// can appear to be "loaded" by different loaders (depending on
// the accessing class).
assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype,
"mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name());
}
// 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 (!rtype->is_loaded()) {
if (PrintOpto && (Verbose || WizardMode)) {
method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
cg->method()->print_name(); tty->cr();
}
if (C->log() != NULL) {
C->log()->elem("assert_null reason='return' klass='%d'",
C->log()->identify(rtype));
}
// If there is going to be a trap, put it at the next bytecode:
set_bci(iter().next_bci());
null_assert(peek());
set_bci(iter().cur_bci()); // put it back
}
BasicType ct = ctype->basic_type();
if (is_reference_type(ct)) {
record_profiled_return_for_speculation();
}
}
// 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);
bool default_handler = false;
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);
if (h_bci == -1) {
default_handler = true;
}
}
if (!default_handler) {
bcis->append(-1);
extypes->append(TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr());
}
int len = bcis->length();
CatchNode *cn = new 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 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 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 ((Verbose || WizardMode) && extype->is_loaded()) {
tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci());
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 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(LoadKlassNode::make(_gvn, 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 PhiNode(ex_node->in(0), TypeKlassPtr::OBJECT);
for (uint i = 1; i < ex_node->req(); i++) {
Node* ex_in = ex_node->in(i);
if (ex_in == top() || ex_in == NULL) {
// This path was not taken.
ex_klass_node->init_req(i, top());
continue;
}
Node* p = basic_plus_adr(ex_in, ex_in, oopDesc::klass_offset_in_bytes());
Node* k = _gvn.transform( LoadKlassNode::make(_gvn, NULL, 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()) {
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
if (PrintOpto && WizardMode) {
tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
}
merge_exception(handler_bci); // jump to handler
return; // No more handling to be done here!
}
// Get the handler's klass
ciInstanceKlass* klass = handler->catch_klass();
if (!klass->is_loaded()) { // klass is not loaded?
// fall through into catch_call_exceptions which will emit a
// handler with an uncommon trap.
break;
}
if (klass->is_interface()) // should not happen, but...
break; // bail out
// Check the type of the exception against the catch type
const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
Node* con = _gvn.makecon(tk);
Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
if (!stopped()) {
PreserveJVMState pjvms(this);
const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
Node* ex_oop = _gvn.transform(new CheckCastPPNode(control(), ex_node, tinst));
push_ex_oop(ex_oop); // Push exception oop for handler
if (PrintOpto && WizardMode) {
tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
klass->print_name();
tty->cr();
}
merge_exception(handler_bci);
}
set_control(not_subtype_ctrl);
// 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");
// 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 TypePtr* addr_type = TypeMetadataPtr::make(method());
Node* adr1 = makecon(addr_type);
Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::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::_invokedynamic:
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::_invokedynamic:
case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
default: fatal("unexpected call bytecode");
}
}
}
}
#endif //PRODUCT
ciMethod* Compile::optimize_virtual_call(ciMethod* caller, int bci, ciInstanceKlass* klass,
ciKlass* holder, ciMethod* callee,
const TypeOopPtr* receiver_type, bool is_virtual,
bool& call_does_dispatch, int& vtable_index,
bool check_access) {
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