c2compiler.cpp revision 5776:de6a9e811145 
1/*
2 * Copyright (c) 1999, 2013, 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/runtime.hpp"
28#ifdef TARGET_ARCH_MODEL_x86_32
29# include "adfiles/ad_x86_32.hpp"
30#endif
31#ifdef TARGET_ARCH_MODEL_x86_64
32# include "adfiles/ad_x86_64.hpp"
33#endif
34#ifdef TARGET_ARCH_MODEL_sparc
35# include "adfiles/ad_sparc.hpp"
36#endif
37#ifdef TARGET_ARCH_MODEL_zero
38# include "adfiles/ad_zero.hpp"
39#endif
40#ifdef TARGET_ARCH_MODEL_arm
41# include "adfiles/ad_arm.hpp"
42#endif
43#ifdef TARGET_ARCH_MODEL_ppc
44# include "adfiles/ad_ppc.hpp"
45#endif
46
47// register information defined by ADLC
48extern const char register_save_policy[];
49extern const int  register_save_type[];
50
51const char* C2Compiler::retry_no_subsuming_loads() {
52  return "retry without subsuming loads";
53}
54const char* C2Compiler::retry_no_escape_analysis() {
55  return "retry without escape analysis";
56}
57bool C2Compiler::init_c2_runtime() {
58
59  // Check assumptions used while running ADLC
60  Compile::adlc_verification();
61  assert(REG_COUNT <= ConcreteRegisterImpl::number_of_registers, "incompatible register counts");
62
63  for (int i = 0; i < ConcreteRegisterImpl::number_of_registers ; i++ ) {
64      OptoReg::vm2opto[i] = OptoReg::Bad;
65  }
66
67  for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(REG_COUNT); i = OptoReg::add(i,1) ) {
68    VMReg r = OptoReg::as_VMReg(i);
69    if (r->is_valid()) {
70      OptoReg::vm2opto[r->value()] = i;
71    }
72  }
73
74  // Check that runtime and architecture description agree on callee-saved-floats
75  bool callee_saved_floats = false;
76  for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
77    // Is there a callee-saved float or double?
78    if( register_save_policy[i] == 'E' /* callee-saved */ &&
79       (register_save_type[i] == Op_RegF || register_save_type[i] == Op_RegD) ) {
80      callee_saved_floats = true;
81    }
82  }
83
84  DEBUG_ONLY( Node::init_NodeProperty(); )
85
86  Compile::pd_compiler2_init();
87
88  CompilerThread* thread = CompilerThread::current();
89
90  HandleMark handle_mark(thread);
91  return OptoRuntime::generate(thread->env());
92}
93
94
95void C2Compiler::initialize() {
96  // The first compiler thread that gets here will initialize the
97  // small amount of global state (and runtime stubs) that C2 needs.
98
99  // There is a race possible once at startup and then we're fine
100
101  // Note that this is being called from a compiler thread not the
102  // main startup thread.
103  if (should_perform_init()) {
104    bool successful = C2Compiler::init_c2_runtime();
105    int new_state = (successful) ? initialized : failed;
106    set_state(new_state);
107  }
108}
109
110void C2Compiler::compile_method(ciEnv* env, ciMethod* target, int entry_bci) {
111  assert(is_initialized(), "Compiler thread must be initialized");
112
113  bool subsume_loads = SubsumeLoads;
114  bool do_escape_analysis = DoEscapeAnalysis && !env->jvmti_can_access_local_variables();
115  bool eliminate_boxing = EliminateAutoBox;
116  while (!env->failing()) {
117    // Attempt to compile while subsuming loads into machine instructions.
118    Compile C(env, this, target, entry_bci, subsume_loads, do_escape_analysis, eliminate_boxing);
119
120
121    // Check result and retry if appropriate.
122    if (C.failure_reason() != NULL) {
123      if (C.failure_reason_is(retry_no_subsuming_loads())) {
124        assert(subsume_loads, "must make progress");
125        subsume_loads = false;
126        continue;  // retry
127      }
128      if (C.failure_reason_is(retry_no_escape_analysis())) {
129        assert(do_escape_analysis, "must make progress");
130        do_escape_analysis = false;
131        continue;  // retry
132      }
133      if (C.has_boxed_value()) {
134        // Recompile without boxing elimination regardless failure reason.
135        assert(eliminate_boxing, "must make progress");
136        eliminate_boxing = false;
137        continue;  // retry
138      }
139      // Pass any other failure reason up to the ciEnv.
140      // Note that serious, irreversible failures are already logged
141      // on the ciEnv via env->record_method_not_compilable().
142      env->record_failure(C.failure_reason());
143    }
144    if (StressRecompilation) {
145      if (subsume_loads) {
146        subsume_loads = false;
147        continue;  // retry
148      }
149      if (do_escape_analysis) {
150        do_escape_analysis = false;
151        continue;  // retry
152      }
153    }
154
155    // No retry; just break the loop.
156    break;
157  }
158}
159
160
161void C2Compiler::print_timers() {
162  // do nothing
163}
164