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
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "ci/ciReplay.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/vmSymbols.hpp"
#include "compiler/compileBroker.hpp"
#include "compiler/compileLog.hpp"
#include "interpreter/linkResolver.hpp"
#include "jfr/jfrEvents.hpp"
#include "oops/objArrayKlass.hpp"
#include "opto/callGenerator.hpp"
#include "opto/parse.hpp"
#include "runtime/handles.inline.hpp"
#include "utilities/events.hpp"
//=============================================================================
//------------------------------InlineTree-------------------------------------
InlineTree::InlineTree(Compile* c,
const InlineTree *caller_tree, ciMethod* callee,
JVMState* caller_jvms, int caller_bci,
float site_invoke_ratio, int max_inline_level) :
C(c),
_caller_jvms(caller_jvms),
_method(callee),
_caller_tree((InlineTree*) caller_tree),
_count_inline_bcs(method()->code_size_for_inlining()),
_site_invoke_ratio(site_invoke_ratio),
_max_inline_level(max_inline_level),
_subtrees(c->comp_arena(), 2, 0, NULL),
_msg(NULL)
{
#ifndef PRODUCT
_count_inlines = 0;
_forced_inline = false;
#endif
if (_caller_jvms != NULL) {
// Keep a private copy of the caller_jvms:
_caller_jvms = new (C) JVMState(caller_jvms->method(), caller_tree->caller_jvms());
_caller_jvms->set_bci(caller_jvms->bci());
assert(!caller_jvms->should_reexecute(), "there should be no reexecute bytecode with inlining");
}
assert(_caller_jvms->same_calls_as(caller_jvms), "consistent JVMS");
assert((caller_tree == NULL ? 0 : caller_tree->stack_depth() + 1) == stack_depth(), "correct (redundant) depth parameter");
assert(caller_bci == this->caller_bci(), "correct (redundant) bci parameter");
// 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++;)
}
}
/**
* Return true when EA is ON and a java constructor is called or
* a super constructor is called from an inlined java constructor.
* Also return true for boxing methods.
* Also return true for methods returning Iterator (including Iterable::iterator())
* that is essential for forall-loops performance.
*/
static bool is_init_with_ea(ciMethod* callee_method,
ciMethod* caller_method, Compile* C) {
if (!C->do_escape_analysis() || !EliminateAllocations) {
return false; // EA is off
}
if (callee_method->is_initializer()) {
return true; // constuctor
}
if (caller_method->is_initializer() &&
caller_method != C->method() &&
caller_method->holder()->is_subclass_of(callee_method->holder())) {
return true; // super constructor is called from inlined constructor
}
if (C->eliminate_boxing() && callee_method->is_boxing_method()) {
return true;
}
ciType *retType = callee_method->signature()->return_type();
ciKlass *iter = C->env()->Iterator_klass();
if(retType->is_loaded() && iter->is_loaded() && retType->is_subtype_of(iter)) {
return true;
}
return false;
}
/**
* Force inlining unboxing accessor.
*/
static bool is_unboxing_method(ciMethod* callee_method, Compile* C) {
return C->eliminate_boxing() && callee_method->is_unboxing_method();
}
// positive filter: should callee be inlined?
bool InlineTree::should_inline(ciMethod* callee_method, ciMethod* caller_method,
int caller_bci, ciCallProfile& profile,
WarmCallInfo* wci_result) {
// Allows targeted inlining
if (C->directive()->should_inline(callee_method)) {
*wci_result = *(WarmCallInfo::always_hot());
if (C->print_inlining() && Verbose) {
CompileTask::print_inline_indent(inline_level());
tty->print_cr("Inlined method is hot: ");
}
set_msg("force inline by CompileCommand");
_forced_inline = true;
return true;
}
if (callee_method->force_inline()) {
set_msg("force inline by annotation");
_forced_inline = true;
return true;
}
#ifndef PRODUCT
int inline_depth = inline_level()+1;
if (ciReplay::should_inline(C->replay_inline_data(), callee_method, caller_bci, inline_depth)) {
set_msg("force inline by ciReplay");
_forced_inline = true;
return true;
}
#endif
int size = callee_method->code_size_for_inlining();
// 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 (C->print_inlining() && Verbose) {
CompileTask::print_inline_indent(inline_level());
tty->print_cr("Inlined method with many throws (throws=%d):", callee_method->interpreter_throwout_count());
}
set_msg("many throws");
return true;
}
int default_max_inline_size = C->max_inline_size();
int inline_small_code_size = InlineSmallCode / 4;
int max_inline_size = default_max_inline_size;
int call_site_count = method()->scale_count(profile.count());
int invoke_count = method()->interpreter_invocation_count();
assert(invoke_count != 0, "require invocation count greater than zero");
int freq = call_site_count / invoke_count;
// bump the max size if the call is frequent
if ((freq >= InlineFrequencyRatio) ||
(call_site_count >= InlineFrequencyCount) ||
is_unboxing_method(callee_method, C) ||
is_init_with_ea(callee_method, caller_method, C)) {
max_inline_size = C->freq_inline_size();
if (size <= max_inline_size && TraceFrequencyInlining) {
CompileTask::print_inline_indent(inline_level());
tty->print_cr("Inlined frequent method (freq=%d count=%d):", freq, call_site_count);
CompileTask::print_inline_indent(inline_level());
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() > inline_small_code_size) {
set_msg("already compiled into a medium method");
return false;
}
}
if (size > max_inline_size) {
if (max_inline_size > default_max_inline_size) {
set_msg("hot method too big");
} else {
set_msg("too big");
}
return false;
}
return true;
}
// negative filter: should callee NOT be inlined?
bool InlineTree::should_not_inline(ciMethod *callee_method,
ciMethod* caller_method,
JVMState* jvms,
WarmCallInfo* wci_result) {
const char* fail_msg = NULL;
// First check all inlining restrictions which are required for correctness
if (callee_method->is_abstract()) {
fail_msg = "abstract method"; // // note: we allow ik->is_abstract()
} else if (!callee_method->holder()->is_initialized() &&
// access allowed in the context of static initializer
C->needs_clinit_barrier(callee_method->holder(), caller_method)) {
fail_msg = "method holder not initialized";
} else if (callee_method->is_native()) {
fail_msg = "native method";
} else if (callee_method->dont_inline()) {
fail_msg = "don't inline by annotation";
}
// one more inlining restriction
if (fail_msg == NULL && callee_method->has_unloaded_classes_in_signature()) {
fail_msg = "unloaded signature classes";
}
if (fail_msg != NULL) {
set_msg(fail_msg);
return true;
}
// ignore heuristic controls on inlining
if (C->directive()->should_inline(callee_method)) {
set_msg("force inline by CompileCommand");
return false;
}
if (C->directive()->should_not_inline(callee_method)) {
set_msg("disallowed by CompileCommand");
return true;
}
#ifndef PRODUCT
int caller_bci = jvms->bci();
int inline_depth = inline_level()+1;
if (ciReplay::should_inline(C->replay_inline_data(), callee_method, caller_bci, inline_depth)) {
set_msg("force inline by ciReplay");
return false;
}
if (ciReplay::should_not_inline(C->replay_inline_data(), callee_method, caller_bci, inline_depth)) {
set_msg("disallowed by ciReplay");
return true;
}
if (ciReplay::should_not_inline(callee_method)) {
set_msg("disallowed by ciReplay");
return true;
}
#endif
if (callee_method->force_inline()) {
set_msg("force inline by annotation");
return false;
}
// Now perform checks which are heuristic
if (is_unboxing_method(callee_method, C)) {
// Inline unboxing methods.
return false;
}
if (callee_method->has_compiled_code() &&
callee_method->instructions_size() > InlineSmallCode) {
set_msg("already compiled into a big method");
return true;
}
// 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())) {
set_msg("exception method");
return true;
}
}
// use frequency-based objections only for non-trivial methods
if (callee_method->code_size() <= MaxTrivialSize) {
return false;
}
// don't use counts with -Xcomp
if (UseInterpreter) {
if (!callee_method->has_compiled_code() &&
!callee_method->was_executed_more_than(0)) {
set_msg("never executed");
return true;
}
if (is_init_with_ea(callee_method, caller_method, C)) {
// Escape Analysis: inline all executed constructors
return false;
} else {
intx counter_high_value;
// Tiered compilation uses a different "high value" than non-tiered compilation.
// Determine the right value to use.
if (TieredCompilation) {
counter_high_value = InvocationCounter::count_limit / 2;
} else {
counter_high_value = CompileThreshold / 2;
}
if (!callee_method->was_executed_more_than(MIN2(MinInliningThreshold, counter_high_value))) {
set_msg("executed < MinInliningThreshold times");
return true;
}
}
}
return false;
}
bool InlineTree::is_not_reached(ciMethod* callee_method, ciMethod* caller_method, int caller_bci, ciCallProfile& profile) {
if (!UseInterpreter) {
return false; // -Xcomp
}
if (profile.count() > 0) {
return false; // reachable according to profile
}
if (!callee_method->was_executed_more_than(0)) {
return true; // callee was never executed
}
if (caller_method->is_not_reached(caller_bci)) {
return true; // call site not resolved
}
if (profile.count() == -1) {
return false; // immature profile; optimistically treat as reached
}
assert(profile.count() == 0, "sanity");
// Profile info is scarce.
// Try to guess: check if the call site belongs to a start block.
// Call sites in a start block should be reachable if no exception is thrown earlier.
ciMethodBlocks* caller_blocks = caller_method->get_method_blocks();
bool is_start_block = caller_blocks->block_containing(caller_bci)->start_bci() == 0;
if (is_start_block) {
return false; // treat the call reached as part of start block
}
return true; // give up and treat the call site as not reached
}
//-----------------------------try_to_inline-----------------------------------
// return true if ok
// Relocated from "InliningClosure::try_to_inline"
bool InlineTree::try_to_inline(ciMethod* callee_method, ciMethod* caller_method,
int caller_bci, JVMState* jvms, ciCallProfile& profile,
WarmCallInfo* wci_result, bool& should_delay) {
if (ClipInlining && (int)count_inline_bcs() >= DesiredMethodLimit) {
if (!callee_method->force_inline() || !IncrementalInline) {
set_msg("size > DesiredMethodLimit");
return false;
} else if (!C->inlining_incrementally()) {
should_delay = true;
}
}
_forced_inline = false; // Reset
if (!should_inline(callee_method, caller_method, caller_bci, profile,
wci_result)) {
return false;
}
if (should_not_inline(callee_method, caller_method, jvms, wci_result)) {
return false;
}
if (InlineAccessors && callee_method->is_accessor()) {
// accessor methods are not subject to any of the following limits.
set_msg("accessor");
return true;
}
// suppress a few checks for accessors and trivial methods
if (callee_method->code_size() > MaxTrivialSize) {
// don't inline into giant methods
if (C->over_inlining_cutoff()) {
if ((!callee_method->force_inline() && !caller_method->is_compiled_lambda_form())
|| !IncrementalInline) {
set_msg("NodeCountInliningCutoff");
return false;
} else {
should_delay = true;
}
}
if (!UseInterpreter &&
is_init_with_ea(callee_method, caller_method, C)) {
// Escape Analysis stress testing when running Xcomp:
// inline constructors even if they are not reached.
} else if (forced_inline()) {
// Inlining was forced by CompilerOracle, ciReplay or annotation
} else if (is_not_reached(callee_method, caller_method, caller_bci, profile)) {
// don't inline unreached call sites
set_msg("call site not reached");
return false;
}
}
if (!C->do_inlining() && InlineAccessors) {
set_msg("not an accessor");
return false;
}
// Limit inlining depth in case inlining is forced or
// _max_inline_level was increased to compensate for lambda forms.
if (inline_level() > MaxForceInlineLevel) {
set_msg("MaxForceInlineLevel");
return false;
}
if (inline_level() > _max_inline_level) {
if (!callee_method->force_inline() || !IncrementalInline) {
set_msg("inlining too deep");
return false;
} else if (!C->inlining_incrementally()) {
should_delay = true;
}
}
// detect direct and indirect recursive inlining
{
// count the current method and the callee
const bool is_compiled_lambda_form = callee_method->is_compiled_lambda_form();
int inline_level = 0;
if (!is_compiled_lambda_form) {
if (method() == callee_method) {
inline_level++;
}
}
// count callers of current method and callee
Node* callee_argument0 = is_compiled_lambda_form ? jvms->map()->argument(jvms, 0)->uncast() : NULL;
for (JVMState* j = jvms->caller(); j != NULL && j->has_method(); j = j->caller()) {
if (j->method() == callee_method) {
if (is_compiled_lambda_form) {
// Since compiled lambda forms are heavily reused we allow recursive inlining. If it is truly
// a recursion (using the same "receiver") we limit inlining otherwise we can easily blow the
// compiler stack.
Node* caller_argument0 = j->map()->argument(j, 0)->uncast();
if (caller_argument0 == callee_argument0) {
inline_level++;
}
} else {
inline_level++;
}
}
}
if (inline_level > MaxRecursiveInlineLevel) {
set_msg("recursive inlining is too deep");
return false;
}
}
int size = callee_method->code_size_for_inlining();
if (ClipInlining && (int)count_inline_bcs() + size >= DesiredMethodLimit) {
if (!callee_method->force_inline() || !IncrementalInline) {
set_msg("size > DesiredMethodLimit");
return false;
} else if (!C->inlining_incrementally()) {
should_delay = true;
}
}
// ok, inline this method
return true;
}
//------------------------------pass_initial_checks----------------------------
bool InlineTree::pass_initial_checks(ciMethod* caller_method, int caller_bci, ciMethod* callee_method) {
// Check if a callee_method was suggested
if (callee_method == NULL) {
return false;
}
ciInstanceKlass *callee_holder = callee_method->holder();
// Check if klass of callee_method is loaded
if (!callee_holder->is_loaded()) {
return false;
}
if (!callee_holder->is_initialized() &&
// access allowed in the context of static initializer
C->needs_clinit_barrier(callee_holder, caller_method)) {
return false;
}
if( !UseInterpreter ) /* running Xcomp */ {
// Checks that constant pool's call site has been visited
// stricter than callee_holder->is_initialized()
ciBytecodeStream iter(caller_method);
iter.force_bci(caller_bci);
Bytecodes::Code call_bc = iter.cur_bc();
// An invokedynamic instruction does not have a klass.
if (call_bc != Bytecodes::_invokedynamic) {
int index = iter.get_index_u2_cpcache();
if (!caller_method->is_klass_loaded(index, true)) {
return false;
}
// Try to do constant pool resolution if running Xcomp
if( !caller_method->check_call(index, call_bc == Bytecodes::_invokestatic) ) {
return false;
}
}
}
return true;
}
//------------------------------check_can_parse--------------------------------
const char* InlineTree::check_can_parse(ciMethod* callee) {
// Certain methods cannot be parsed at all:
if ( callee->is_native()) return "native method";
if ( callee->is_abstract()) return "abstract method";
if (!callee->has_balanced_monitors()) return "not compilable (unbalanced monitors)";
if ( callee->get_flow_analysis()->failing()) return "not compilable (flow analysis failed)";
if (!callee->can_be_parsed()) return "cannot be parsed";
return NULL;
}
static void post_inlining_event(int compile_id,const char* msg, bool success, int bci, ciMethod* caller, ciMethod* callee) {
assert(caller != NULL, "invariant");
assert(callee != NULL, "invariant");
EventCompilerInlining event;
if (event.should_commit()) {
JfrStructCalleeMethod callee_struct;
callee_struct.set_type(callee->holder()->name()->as_utf8());
callee_struct.set_name(callee->name()->as_utf8());
callee_struct.set_descriptor(callee->signature()->as_symbol()->as_utf8());
event.set_compileId(compile_id);
event.set_message(msg);
event.set_succeeded(success);
event.set_bci(bci);
event.set_caller(caller->get_Method());
event.set_callee(callee_struct);
event.commit();
}
}
//------------------------------print_inlining---------------------------------
void InlineTree::print_inlining(ciMethod* callee_method, int caller_bci,
ciMethod* caller_method, bool success) const {
const char* inline_msg = msg();
assert(inline_msg != NULL, "just checking");
if (C->log() != NULL) {
if (success) {
C->log()->inline_success(inline_msg);
} else {
C->log()->inline_fail(inline_msg);
}
}
CompileTask::print_inlining_ul(callee_method, inline_level(),
caller_bci, inline_msg);
if (C->print_inlining()) {
C->print_inlining(callee_method, inline_level(), caller_bci, inline_msg);
guarantee(callee_method != NULL, "would crash in post_inlining_event");
if (Verbose) {
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());
}
}
post_inlining_event(C->compile_id(), inline_msg, success, caller_bci, caller_method, callee_method);
}
//------------------------------ok_to_inline-----------------------------------
WarmCallInfo* InlineTree::ok_to_inline(ciMethod* callee_method, JVMState* jvms, ciCallProfile& profile, WarmCallInfo* initial_wci, bool& should_delay) {
assert(callee_method != NULL, "caller checks for optimized virtual!");
assert(!should_delay, "should be initialized to false");
#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
int caller_bci = jvms->bci();
ciMethod* caller_method = jvms->method();
// Do some initial checks.
if (!pass_initial_checks(caller_method, caller_bci, callee_method)) {
set_msg("failed initial checks");
print_inlining(callee_method, caller_bci, caller_method, false /* !success */);
return NULL;
}
// Do some parse checks.
set_msg(check_can_parse(callee_method));
if (msg() != NULL) {
print_inlining(callee_method, caller_bci, caller_method, false /* !success */);
return NULL;
}
// Check if inlining policy says no.
WarmCallInfo wci = *(initial_wci);
bool success = try_to_inline(callee_method, caller_method, caller_bci,
jvms, profile, &wci, should_delay);
#ifndef PRODUCT
if (InlineWarmCalls && (PrintOpto || C->print_inlining())) {
bool cold = wci.is_cold();
bool hot = !cold && wci.is_hot();
bool old_cold = !success;
if (old_cold != cold || (Verbose || WizardMode)) {
if (msg() == NULL) {
set_msg("OK");
}
tty->print(" OldInlining= %4s : %s\n WCI=",
old_cold ? "cold" : "hot", msg());
wci.print();
}
}
#endif
if (success) {
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()) {
// Inline!
if (msg() == NULL) {
set_msg("inline (hot)");
}
print_inlining(callee_method, caller_bci, caller_method, true /* success */);
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 (msg() == NULL) {
set_msg("too cold to inline");
}
print_inlining(callee_method, caller_bci, caller_method, false /* !success */ );
return NULL;
}
//------------------------------compute_callee_frequency-----------------------
float InlineTree::compute_callee_frequency( int caller_bci ) const {
int count = method()->interpreter_call_site_count(caller_bci);
int invcnt = method()->interpreter_invocation_count();
float freq = (float)count/(float)invcnt;
// Call-site count / interpreter invocation count, scaled recursively.
// Always between 0.0 and 1.0. Represents the percentage of the method's
// total execution time used at this call site.
return freq;
}
//------------------------------build_inline_tree_for_callee-------------------
InlineTree *InlineTree::build_inline_tree_for_callee( ciMethod* callee_method, JVMState* caller_jvms, int caller_bci) {
float recur_frequency = _site_invoke_ratio * compute_callee_frequency(caller_bci);
// Attempt inlining.
InlineTree* old_ilt = callee_at(caller_bci, callee_method);
if (old_ilt != NULL) {
return old_ilt;
}
int max_inline_level_adjust = 0;
if (caller_jvms->method() != NULL) {
if (caller_jvms->method()->is_compiled_lambda_form()) {
max_inline_level_adjust += 1; // don't count actions in MH or indy adapter frames
} else if (callee_method->is_method_handle_intrinsic() ||
callee_method->is_compiled_lambda_form()) {
max_inline_level_adjust += 1; // don't count method handle calls from java.lang.invoke implementation
}
if (max_inline_level_adjust != 0 && C->print_inlining() && (Verbose || WizardMode)) {
CompileTask::print_inline_indent(inline_level());
tty->print_cr(" \\-> discounting inline depth");
}
if (max_inline_level_adjust != 0 && C->log()) {
int id1 = C->log()->identify(caller_jvms->method());
int id2 = C->log()->identify(callee_method);
C->log()->elem("inline_level_discount caller='%d' callee='%d'", id1, id2);
}
}
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