1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "opto/c2compiler.hpp"
27 #include "opto/compile.hpp"
28 #include "opto/optoreg.hpp"
29 #include "opto/output.hpp"
30 #include "opto/runtime.hpp"
31
32 // register information defined by ADLC
33 extern const char register_save_policy[];
34 extern const int register_save_type[];
35
36 const char* C2Compiler::retry_no_subsuming_loads() {
37 return "retry without subsuming loads";
38 }
39 const char* C2Compiler::retry_no_escape_analysis() {
40 return "retry without escape analysis";
41 }
42 const char* C2Compiler::retry_class_loading_during_parsing() {
43 return "retry class loading during parsing";
44 }
45 bool C2Compiler::init_c2_runtime() {
46
47 // Check assumptions used while running ADLC
48 Compile::adlc_verification();
49 assert(REG_COUNT <= ConcreteRegisterImpl::number_of_registers, "incompatible register counts");
50
51 for (int i = 0; i < ConcreteRegisterImpl::number_of_registers ; i++ ) {
52 OptoReg::vm2opto[i] = OptoReg::Bad;
53 }
54
55 for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(REG_COUNT); i = OptoReg::add(i,1) ) {
56 VMReg r = OptoReg::as_VMReg(i);
57 if (r->is_valid()) {
58 OptoReg::vm2opto[r->value()] = i;
59 }
60 }
61
62 #ifdef X86
63 #ifdef _LP64
64 if (UseAVX < 3) {
65 int delta = XMMRegisterImpl::max_slots_per_register * XMMRegisterImpl::number_of_registers;
66 int bottom = ConcreteRegisterImpl::max_fpr;
67 int top = bottom + delta;
68 int middle = bottom + (delta / 2);
69 int xmm_slots = XMMRegisterImpl::max_slots_per_register;
70 int lower = xmm_slots / 2;
71 // mark bad every register that we cannot get to if AVX less than 3, we have all slots in the array
72 // Note: vm2opto is allocated to ConcreteRegisterImpl::number_of_registers
73 for (int i = bottom; i < middle; i+= xmm_slots) {
74 for( OptoReg::Name j=OptoReg::Name(i + lower); j<OptoReg::Name(i + xmm_slots); j = OptoReg::add(j,1) ) {
75 OptoReg::vm2opto[j] = OptoReg::Bad;
76 }
77 }
78 // mark the upper zmm bank bad and all the mask registers bad in this case
79 for( OptoReg::Name i=OptoReg::Name(middle); i<OptoReg::Name(_last_Mach_Reg-1); i = OptoReg::add(i,1) ) {
80 OptoReg::vm2opto[i] = OptoReg::Bad;
81 }
82 }
83 #endif
84 #endif
85
86 // Check that runtime and architecture description agree on callee-saved-floats
87 bool callee_saved_floats = false;
88 for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
89 // Is there a callee-saved float or double?
90 if( register_save_policy[i] == 'E' /* callee-saved */ &&
91 (register_save_type[i] == Op_RegF || register_save_type[i] == Op_RegD) ) {
92 callee_saved_floats = true;
93 }
94 }
95
96 DEBUG_ONLY( Node::init_NodeProperty(); )
97
98 Compile::pd_compiler2_init();
99
100 CompilerThread* thread = CompilerThread::current();
101
102 HandleMark handle_mark(thread);
103 return OptoRuntime::generate(thread->env());
104 }
105
106
107 void C2Compiler::initialize() {
108 // The first compiler thread that gets here will initialize the
109 // small amount of global state (and runtime stubs) that C2 needs.
110
111 // There is a race possible once at startup and then we're fine
112
113 // Note that this is being called from a compiler thread not the
114 // main startup thread.
115 if (should_perform_init()) {
116 bool successful = C2Compiler::init_c2_runtime();
117 int new_state = (successful) ? initialized : failed;
118 set_state(new_state);
119 }
120 }
121
122 void C2Compiler::compile_method(ciEnv* env, ciMethod* target, int entry_bci) {
123 assert(is_initialized(), "Compiler thread must be initialized");
124
125 bool subsume_loads = SubsumeLoads;
126 bool do_escape_analysis = DoEscapeAnalysis && !env->should_retain_local_variables();
127 bool eliminate_boxing = EliminateAutoBox;
128 while (!env->failing()) {
129 // Attempt to compile while subsuming loads into machine instructions.
130 Compile C(env, this, target, entry_bci, subsume_loads, do_escape_analysis, eliminate_boxing);
131
132 // Check result and retry if appropriate.
133 if (C.failure_reason() != NULL) {
134 if (C.failure_reason_is(retry_class_loading_during_parsing())) {
135 env->report_failure(C.failure_reason());
136 continue; // retry
137 }
138 if (C.failure_reason_is(retry_no_subsuming_loads())) {
139 assert(subsume_loads, "must make progress");
140 subsume_loads = false;
141 env->report_failure(C.failure_reason());
142 continue; // retry
143 }
144 if (C.failure_reason_is(retry_no_escape_analysis())) {
145 assert(do_escape_analysis, "must make progress");
146 do_escape_analysis = false;
147 env->report_failure(C.failure_reason());
148 continue; // retry
149 }
150 if (C.has_boxed_value()) {
151 // Recompile without boxing elimination regardless failure reason.
152 assert(eliminate_boxing, "must make progress");
153 eliminate_boxing = false;
154 env->report_failure(C.failure_reason());
155 continue; // retry
156 }
157 // Pass any other failure reason up to the ciEnv.
158 // Note that serious, irreversible failures are already logged
159 // on the ciEnv via env->record_method_not_compilable().
160 env->record_failure(C.failure_reason());
161 }
162 if (StressRecompilation) {
163 if (subsume_loads) {
164 subsume_loads = false;
165 continue; // retry
166 }
167 if (do_escape_analysis) {
168 do_escape_analysis = false;
169 continue; // retry
170 }
171 }
172
173 // print inlining for last compilation only
174 C.dump_print_inlining();
175
176 // No retry; just break the loop.
177 break;
178 }
179 }
180
181
182 void C2Compiler::print_timers() {
183 Compile::print_timers();
184 }
185
186 int C2Compiler::initial_code_buffer_size() {
187 assert(SegmentedCodeCache, "Should be only used with a segmented code cache");
188 return Compile::MAX_inst_size + Compile::MAX_locs_size + initial_const_capacity;
189 }