1 /*
   2  * Copyright (c) 1999, 2011, 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 
  48 volatile int C2Compiler::_runtimes = uninitialized;
  49 
  50 // register information defined by ADLC
  51 extern const char register_save_policy[];
  52 extern const int  register_save_type[];
  53 
  54 const char* C2Compiler::retry_no_subsuming_loads() {
  55   return "retry without subsuming loads";
  56 }
  57 const char* C2Compiler::retry_no_escape_analysis() {
  58   return "retry without escape analysis";
  59 }
  60 void C2Compiler::initialize_runtime() {
  61 
  62   // Check assumptions used while running ADLC
  63   Compile::adlc_verification();
  64   assert(REG_COUNT <= ConcreteRegisterImpl::number_of_registers, "incompatible register counts");
  65 
  66   for (int i = 0; i < ConcreteRegisterImpl::number_of_registers ; i++ ) {
  67       OptoReg::vm2opto[i] = OptoReg::Bad;
  68   }
  69 
  70   for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(REG_COUNT); i = OptoReg::add(i,1) ) {
  71     VMReg r = OptoReg::as_VMReg(i);
  72     if (r->is_valid()) {
  73       OptoReg::vm2opto[r->value()] = i;
  74     }
  75   }
  76 
  77   // Check that runtime and architecture description agree on callee-saved-floats
  78   bool callee_saved_floats = false;
  79   for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
  80     // Is there a callee-saved float or double?
  81     if( register_save_policy[i] == 'E' /* callee-saved */ &&
  82        (register_save_type[i] == Op_RegF || register_save_type[i] == Op_RegD) ) {
  83       callee_saved_floats = true;
  84     }
  85   }
  86 
  87   DEBUG_ONLY( Node::init_NodeProperty(); )
  88 
  89   Compile::pd_compiler2_init();
  90 
  91   CompilerThread* thread = CompilerThread::current();
  92 
  93   HandleMark  handle_mark(thread);
  94 
  95   OptoRuntime::generate(thread->env());
  96 
  97 }
  98 
  99 
 100 void C2Compiler::initialize() {
 101 
 102   // This method can only be called once per C2Compiler object
 103   // The first compiler thread that gets here will initialize the
 104   // small amount of global state (and runtime stubs) that c2 needs.
 105 
 106   // There is a race possible once at startup and then we're fine
 107 
 108   // Note that this is being called from a compiler thread not the
 109   // main startup thread.
 110 
 111   if (_runtimes != initialized) {
 112     initialize_runtimes( initialize_runtime, &_runtimes);

 113   }
 114 
 115   // Mark this compiler object as ready to roll
 116   mark_initialized();
 117 }
 118 
 119 void C2Compiler::compile_method(ciEnv* env,
 120                                 ciMethod* target,
 121                                 int entry_bci) {
 122   if (!is_initialized()) {
 123     initialize();
 124   }
 125   bool subsume_loads = SubsumeLoads;
 126   bool do_escape_analysis = DoEscapeAnalysis &&
 127     !env->jvmti_can_access_local_variables();
 128   bool eliminate_boxing = EliminateAutoBox;
 129   while (!env->failing()) {
 130     // Attempt to compile while subsuming loads into machine instructions.
 131     Compile C(env, this, target, entry_bci, subsume_loads, do_escape_analysis, eliminate_boxing);
 132 
 133 
 134     // Check result and retry if appropriate.
 135     if (C.failure_reason() != NULL) {
 136       if (C.failure_reason_is(retry_no_subsuming_loads())) {
 137         assert(subsume_loads, "must make progress");
 138         subsume_loads = false;
 139         continue;  // retry
 140       }
 141       if (C.failure_reason_is(retry_no_escape_analysis())) {
 142         assert(do_escape_analysis, "must make progress");
 143         do_escape_analysis = false;
 144         continue;  // retry
 145       }
 146       if (C.has_boxed_value()) {
 147         // Recompile without boxing elimination regardless failure reason.
 148         assert(eliminate_boxing, "must make progress");
 149         eliminate_boxing = false;
 150         continue;  // retry
 151       }
 152       // Pass any other failure reason up to the ciEnv.
 153       // Note that serious, irreversible failures are already logged
 154       // on the ciEnv via env->record_method_not_compilable().
 155       env->record_failure(C.failure_reason());
 156     }
 157     if (StressRecompilation) {
 158       if (subsume_loads) {
 159         subsume_loads = false;
 160         continue;  // retry
 161       }
 162       if (do_escape_analysis) {
 163         do_escape_analysis = false;
 164         continue;  // retry
 165       }
 166     }
 167 
 168     // No retry; just break the loop.
 169     break;
 170   }
 171 }
 172 
 173 
 174 void C2Compiler::print_timers() {
 175   // do nothing
 176 }
--- EOF ---