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 bool C2Compiler::init_c2_runtime() {
43
44 // Check assumptions used while running ADLC
45 Compile::adlc_verification();
46 assert(REG_COUNT <= ConcreteRegisterImpl::number_of_registers, "incompatible register counts");
47
48 for (int i = 0; i < ConcreteRegisterImpl::number_of_registers ; i++ ) {
49 OptoReg::vm2opto[i] = OptoReg::Bad;
50 }
51
52 for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(REG_COUNT); i = OptoReg::add(i,1) ) {
53 VMReg r = OptoReg::as_VMReg(i);
54 if (r->is_valid()) {
55 OptoReg::vm2opto[r->value()] = i;
56 }
57 }
58
59 // Check that runtime and architecture description agree on callee-saved-floats
60 bool callee_saved_floats = false;
61 for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
62 // Is there a callee-saved float or double?
63 if( register_save_policy[i] == 'E' /* callee-saved */ &&
64 (register_save_type[i] == Op_RegF || register_save_type[i] == Op_RegD) ) {
65 callee_saved_floats = true;
66 }
67 }
68
69 DEBUG_ONLY( Node::init_NodeProperty(); )
70
71 Compile::pd_compiler2_init();
72
73 CompilerThread* thread = CompilerThread::current();
74
75 HandleMark handle_mark(thread);
76 return OptoRuntime::generate(thread->env());
77 }
78
79
80 void C2Compiler::initialize() {
81 // The first compiler thread that gets here will initialize the
82 // small amount of global state (and runtime stubs) that C2 needs.
83
84 // There is a race possible once at startup and then we're fine
85
86 // Note that this is being called from a compiler thread not the
87 // main startup thread.
88 if (should_perform_init()) {
89 bool successful = C2Compiler::init_c2_runtime();
90 int new_state = (successful) ? initialized : failed;
91 set_state(new_state);
92 }
93 }
94
95 void C2Compiler::compile_method(ciEnv* env, ciMethod* target, int entry_bci) {
96 assert(is_initialized(), "Compiler thread must be initialized");
97
98 bool subsume_loads = SubsumeLoads;
99 bool do_escape_analysis = DoEscapeAnalysis && !env->should_retain_local_variables();
100 bool eliminate_boxing = EliminateAutoBox;
101 while (!env->failing()) {
102 // Attempt to compile while subsuming loads into machine instructions.
103 Compile C(env, this, target, entry_bci, subsume_loads, do_escape_analysis, eliminate_boxing);
104
105
106 // Check result and retry if appropriate.
107 if (C.failure_reason() != NULL) {
108 if (C.failure_reason_is(retry_no_subsuming_loads())) {
109 assert(subsume_loads, "must make progress");
110 subsume_loads = false;
111 continue; // retry
112 }
113 if (C.failure_reason_is(retry_no_escape_analysis())) {
114 assert(do_escape_analysis, "must make progress");
115 do_escape_analysis = false;
116 continue; // retry
117 }
118 if (C.has_boxed_value()) {
119 // Recompile without boxing elimination regardless failure reason.
120 assert(eliminate_boxing, "must make progress");
121 eliminate_boxing = false;
122 continue; // retry
123 }
124 // Pass any other failure reason up to the ciEnv.
125 // Note that serious, irreversible failures are already logged
126 // on the ciEnv via env->record_method_not_compilable().
127 env->record_failure(C.failure_reason());
128 }
129 if (StressRecompilation) {
130 if (subsume_loads) {
131 subsume_loads = false;
132 continue; // retry
133 }
134 if (do_escape_analysis) {
135 do_escape_analysis = false;
136 continue; // retry
137 }
138 }
139
140 // print inlining for last compilation only
141 C.dump_print_inlining();
142
143 // No retry; just break the loop.
144 break;
145 }
146 }
147
148
149 void C2Compiler::print_timers() {
150 // do nothing
151 }
152
153 int C2Compiler::initial_code_buffer_size() {
154 assert(SegmentedCodeCache, "Should be only used with a segmented code cache");
155 return Compile::MAX_inst_size + Compile::MAX_locs_size + initial_const_capacity;
156 }