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/optoreg.hpp"
28 #include "opto/runtime.hpp"
29
30 // register information defined by ADLC
31 extern const char register_save_policy[];
32 extern const int register_save_type[];
33
34 const char* C2Compiler::retry_no_subsuming_loads() {
35 return "retry without subsuming loads";
36 }
37 const char* C2Compiler::retry_no_escape_analysis() {
38 return "retry without escape analysis";
39 }
40 bool C2Compiler::init_c2_runtime() {
41
42 // Check assumptions used while running ADLC
43 Compile::adlc_verification();
44 assert(REG_COUNT <= ConcreteRegisterImpl::number_of_registers, "incompatible register counts");
45
46 for (int i = 0; i < ConcreteRegisterImpl::number_of_registers ; i++ ) {
47 OptoReg::vm2opto[i] = OptoReg::Bad;
48 }
49
50 for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(REG_COUNT); i = OptoReg::add(i,1) ) {
51 VMReg r = OptoReg::as_VMReg(i);
52 if (r->is_valid()) {
53 OptoReg::vm2opto[r->value()] = i;
54 }
55 }
56
57 // Check that runtime and architecture description agree on callee-saved-floats
58 bool callee_saved_floats = false;
59 for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
60 // Is there a callee-saved float or double?
61 if( register_save_policy[i] == 'E' /* callee-saved */ &&
62 (register_save_type[i] == Op_RegF || register_save_type[i] == Op_RegD) ) {
63 callee_saved_floats = true;
64 }
65 }
66
67 DEBUG_ONLY( Node::init_NodeProperty(); )
68
69 Compile::pd_compiler2_init();
70
71 CompilerThread* thread = CompilerThread::current();
72
73 HandleMark handle_mark(thread);
74 return OptoRuntime::generate(thread->env());
75 }
76
77
78 void C2Compiler::initialize() {
79 // The first compiler thread that gets here will initialize the
80 // small amount of global state (and runtime stubs) that C2 needs.
81
82 // There is a race possible once at startup and then we're fine
83
84 // Note that this is being called from a compiler thread not the
85 // main startup thread.
86 if (should_perform_init()) {
87 bool successful = C2Compiler::init_c2_runtime();
88 int new_state = (successful) ? initialized : failed;
89 set_state(new_state);
90 }
91 }
92
93 void C2Compiler::compile_method(ciEnv* env, ciMethod* target, int entry_bci) {
94 assert(is_initialized(), "Compiler thread must be initialized");
95
96 bool subsume_loads = SubsumeLoads;
97 bool do_escape_analysis = DoEscapeAnalysis && !env->should_retain_local_variables();
98 bool eliminate_boxing = EliminateAutoBox;
99 while (!env->failing()) {
100 // Attempt to compile while subsuming loads into machine instructions.
101 Compile C(env, this, target, entry_bci, subsume_loads, do_escape_analysis, eliminate_boxing);
102
103
104 // Check result and retry if appropriate.
105 if (C.failure_reason() != NULL) {
106 if (C.failure_reason_is(retry_no_subsuming_loads())) {
107 assert(subsume_loads, "must make progress");
108 subsume_loads = false;
109 continue; // retry
110 }
111 if (C.failure_reason_is(retry_no_escape_analysis())) {
112 assert(do_escape_analysis, "must make progress");
113 do_escape_analysis = false;
114 continue; // retry
115 }
116 if (C.has_boxed_value()) {
117 // Recompile without boxing elimination regardless failure reason.
118 assert(eliminate_boxing, "must make progress");
119 eliminate_boxing = false;
120 continue; // retry
121 }
122 // Pass any other failure reason up to the ciEnv.
123 // Note that serious, irreversible failures are already logged
124 // on the ciEnv via env->record_method_not_compilable().
125 env->record_failure(C.failure_reason());
126 }
127 if (StressRecompilation) {
128 if (subsume_loads) {
129 subsume_loads = false;
130 continue; // retry
131 }
132 if (do_escape_analysis) {
133 do_escape_analysis = false;
134 continue; // retry
135 }
136 }
137
138 // print inlining for last compilation only
139 C.dump_print_inlining();
140
141 // No retry; just break the loop.
142 break;
143 }
144 }
145
146
147 void C2Compiler::print_timers() {
148 // do nothing
149 }