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src/share/vm/opto/c2compiler.cpp@3e1cd663c2d3 (annotated)

src/share/vm/opto/c2compiler.cpp

Fri, 15 Apr 2016 12:02:37 +0530

author

shshahma

date

Fri, 15 Apr 2016 12:02:37 +0530

changeset 8421

3e1cd663c2d3

parent 7598

ddce0b7cee93

child 8604

04d83ba48607

child 9942

eddd586d1a4c

permissions

-rw-r--r--

8055530: assert(_exits.control()->is_top() || !_gvn.type(ret_phi)->empty()) failed: return value must be well defined
Summary: concurrent class loading causes return phi to become top
Reviewed-by: kvn

duke@435	1	/*
dlong@7598	2	* Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#include "precompiled.hpp"
stefank@2314	26	#include "opto/c2compiler.hpp"
stefank@2314	27	#include "opto/runtime.hpp"
dlong@7598	28	#if defined AD_MD_HPP
dlong@7598	29	# include AD_MD_HPP
dlong@7598	30	#elif defined TARGET_ARCH_MODEL_x86_32
stefank@2314	31	# include "adfiles/ad_x86_32.hpp"
dlong@7598	32	#elif defined TARGET_ARCH_MODEL_x86_64
stefank@2314	33	# include "adfiles/ad_x86_64.hpp"
dlong@7598	34	#elif defined TARGET_ARCH_MODEL_sparc
stefank@2314	35	# include "adfiles/ad_sparc.hpp"
dlong@7598	36	#elif defined TARGET_ARCH_MODEL_zero
stefank@2314	37	# include "adfiles/ad_zero.hpp"
dlong@7598	38	#elif defined TARGET_ARCH_MODEL_ppc_64
goetz@6441	39	# include "adfiles/ad_ppc_64.hpp"
bobv@2508	40	#endif
duke@435	41
duke@435	42	// register information defined by ADLC
duke@435	43	extern const char register_save_policy[];
duke@435	44	extern const int register_save_type[];
duke@435	45
duke@435	46	const char* C2Compiler::retry_no_subsuming_loads() {
duke@435	47	return "retry without subsuming loads";
duke@435	48	}
kvn@473	49	const char* C2Compiler::retry_no_escape_analysis() {
kvn@473	50	return "retry without escape analysis";
kvn@473	51	}
shshahma@8421	52	const char* C2Compiler::retry_class_loading_during_parsing() {
shshahma@8421	53	return "retry class loading during parsing";
shshahma@8421	54	}
anoll@5919	55	bool C2Compiler::init_c2_runtime() {
duke@435	56
duke@435	57	// Check assumptions used while running ADLC
duke@435	58	Compile::adlc_verification();
duke@435	59	assert(REG_COUNT <= ConcreteRegisterImpl::number_of_registers, "incompatible register counts");
duke@435	60
duke@435	61	for (int i = 0; i < ConcreteRegisterImpl::number_of_registers ; i++ ) {
duke@435	62	OptoReg::vm2opto[i] = OptoReg::Bad;
duke@435	63	}
duke@435	64
duke@435	65	for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(REG_COUNT); i = OptoReg::add(i,1) ) {
duke@435	66	VMReg r = OptoReg::as_VMReg(i);
duke@435	67	if (r->is_valid()) {
duke@435	68	OptoReg::vm2opto[r->value()] = i;
duke@435	69	}
duke@435	70	}
duke@435	71
duke@435	72	// Check that runtime and architecture description agree on callee-saved-floats
duke@435	73	bool callee_saved_floats = false;
duke@435	74	for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
duke@435	75	// Is there a callee-saved float or double?
duke@435	76	if( register_save_policy[i] == 'E' /* callee-saved */ &&
duke@435	77	(register_save_type[i] == Op_RegF || register_save_type[i] == Op_RegD) ) {
duke@435	78	callee_saved_floats = true;
duke@435	79	}
duke@435	80	}
duke@435	81
duke@435	82	DEBUG_ONLY( Node::init_NodeProperty(); )
duke@435	83
duke@435	84	Compile::pd_compiler2_init();
duke@435	85
duke@435	86	CompilerThread* thread = CompilerThread::current();
duke@435	87
anoll@5919	88	HandleMark handle_mark(thread);
anoll@5919	89	return OptoRuntime::generate(thread->env());
duke@435	90	}
duke@435	91
duke@435	92
duke@435	93	void C2Compiler::initialize() {
duke@435	94	// The first compiler thread that gets here will initialize the
anoll@5919	95	// small amount of global state (and runtime stubs) that C2 needs.
duke@435	96
duke@435	97	// There is a race possible once at startup and then we're fine
duke@435	98
duke@435	99	// Note that this is being called from a compiler thread not the
duke@435	100	// main startup thread.
anoll@5919	101	if (should_perform_init()) {
anoll@5919	102	bool successful = C2Compiler::init_c2_runtime();
anoll@5919	103	int new_state = (successful) ? initialized : failed;
anoll@5919	104	set_state(new_state);
duke@435	105	}
duke@435	106	}
duke@435	107
anoll@5919	108	void C2Compiler::compile_method(ciEnv* env, ciMethod* target, int entry_bci) {
anoll@5919	109	assert(is_initialized(), "Compiler thread must be initialized");
anoll@5919	110
kvn@2040	111	bool subsume_loads = SubsumeLoads;
anoll@5919	112	bool do_escape_analysis = DoEscapeAnalysis && !env->jvmti_can_access_local_variables();
kvn@5110	113	bool eliminate_boxing = EliminateAutoBox;
duke@435	114	while (!env->failing()) {
duke@435	115	// Attempt to compile while subsuming loads into machine instructions.
kvn@5110	116	Compile C(env, this, target, entry_bci, subsume_loads, do_escape_analysis, eliminate_boxing);
duke@435	117
kvn@2040	118
duke@435	119	// Check result and retry if appropriate.
duke@435	120	if (C.failure_reason() != NULL) {
shshahma@8421	121	if (C.failure_reason_is(retry_class_loading_during_parsing())) {
shshahma@8421	122	env->record_failure(C.failure_reason());
shshahma@8421	123	continue; // retry
shshahma@8421	124	}
kvn@473	125	if (C.failure_reason_is(retry_no_subsuming_loads())) {
duke@435	126	assert(subsume_loads, "must make progress");
duke@435	127	subsume_loads = false;
duke@435	128	continue; // retry
duke@435	129	}
kvn@473	130	if (C.failure_reason_is(retry_no_escape_analysis())) {
kvn@473	131	assert(do_escape_analysis, "must make progress");
kvn@473	132	do_escape_analysis = false;
kvn@473	133	continue; // retry
kvn@473	134	}
kvn@5110	135	if (C.has_boxed_value()) {
kvn@5110	136	// Recompile without boxing elimination regardless failure reason.
kvn@5110	137	assert(eliminate_boxing, "must make progress");
kvn@5110	138	eliminate_boxing = false;
kvn@5110	139	continue; // retry
kvn@5110	140	}
duke@435	141	// Pass any other failure reason up to the ciEnv.
duke@435	142	// Note that serious, irreversible failures are already logged
duke@435	143	// on the ciEnv via env->record_method_not_compilable().
duke@435	144	env->record_failure(C.failure_reason());
duke@435	145	}
kvn@2040	146	if (StressRecompilation) {
kvn@2040	147	if (subsume_loads) {
kvn@2040	148	subsume_loads = false;
kvn@2040	149	continue; // retry
kvn@2040	150	}
kvn@2040	151	if (do_escape_analysis) {
kvn@2040	152	do_escape_analysis = false;
kvn@2040	153	continue; // retry
kvn@2040	154	}
kvn@2040	155	}
duke@435	156
duke@435	157	// No retry; just break the loop.
duke@435	158	break;
duke@435	159	}
duke@435	160	}
duke@435	161
duke@435	162
duke@435	163	void C2Compiler::print_timers() {
duke@435	164	// do nothing
duke@435	165	}