1 /*
   2  * Copyright (c) 1999, 2010, 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 "incls/_precompiled.incl"
  26 #include "incls/_c2compiler.cpp.incl"
  27 
  28 
  29 volatile int C2Compiler::_runtimes = uninitialized;
  30 
  31 // register information defined by ADLC
  32 extern const char register_save_policy[];
  33 extern const int  register_save_type[];
  34 
  35 const char* C2Compiler::retry_no_subsuming_loads() {
  36   return "retry without subsuming loads";
  37 }
  38 const char* C2Compiler::retry_no_escape_analysis() {
  39   return "retry without escape analysis";
  40 }
  41 void C2Compiler::initialize_runtime() {
  42 
  43   // Check assumptions used while running ADLC
  44   Compile::adlc_verification();
  45   assert(REG_COUNT <= ConcreteRegisterImpl::number_of_registers, "incompatible register counts");
  46 
  47   for (int i = 0; i < ConcreteRegisterImpl::number_of_registers ; i++ ) {
  48       OptoReg::vm2opto[i] = OptoReg::Bad;
  49   }
  50 
  51   for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(REG_COUNT); i = OptoReg::add(i,1) ) {
  52     VMReg r = OptoReg::as_VMReg(i);
  53     if (r->is_valid()) {
  54       OptoReg::vm2opto[r->value()] = i;
  55     }
  56   }
  57 
  58   // Check that runtime and architecture description agree on callee-saved-floats
  59   bool callee_saved_floats = false;
  60   for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
  61     // Is there a callee-saved float or double?
  62     if( register_save_policy[i] == 'E' /* callee-saved */ &&
  63        (register_save_type[i] == Op_RegF || register_save_type[i] == Op_RegD) ) {
  64       callee_saved_floats = true;
  65     }
  66   }
  67 
  68   DEBUG_ONLY( Node::init_NodeProperty(); )
  69 
  70   Compile::pd_compiler2_init();
  71 
  72   CompilerThread* thread = CompilerThread::current();
  73 
  74   HandleMark  handle_mark(thread);
  75 
  76   OptoRuntime::generate(thread->env());
  77 
  78 }
  79 
  80 
  81 void C2Compiler::initialize() {
  82 
  83   // This method can only be called once per C2Compiler object
  84   // The first compiler thread that gets here will initialize the
  85   // small amount of global state (and runtime stubs) that c2 needs.
  86 
  87   // There is a race possible once at startup and then we're fine
  88 
  89   // Note that this is being called from a compiler thread not the
  90   // main startup thread.
  91 
  92   if (_runtimes != initialized) {
  93     initialize_runtimes( initialize_runtime, &_runtimes);
  94   }
  95 
  96   // Mark this compiler object as ready to roll
  97   mark_initialized();
  98 }
  99 
 100 void C2Compiler::compile_method(ciEnv* env,
 101                                 ciMethod* target,
 102                                 int entry_bci) {
 103   if (!is_initialized()) {
 104     initialize();
 105   }
 106   bool subsume_loads = SubsumeLoads;
 107   bool do_escape_analysis = DoEscapeAnalysis &&
 108     !env->jvmti_can_access_local_variables();
 109   while (!env->failing()) {
 110     // Attempt to compile while subsuming loads into machine instructions.
 111     Compile C(env, this, target, entry_bci, subsume_loads, do_escape_analysis);
 112 
 113 
 114     // Check result and retry if appropriate.
 115     if (C.failure_reason() != NULL) {
 116       if (C.failure_reason_is(retry_no_subsuming_loads())) {
 117         assert(subsume_loads, "must make progress");
 118         subsume_loads = false;
 119         continue;  // retry
 120       }
 121       if (C.failure_reason_is(retry_no_escape_analysis())) {
 122         assert(do_escape_analysis, "must make progress");
 123         do_escape_analysis = false;
 124         continue;  // retry
 125       }
 126       // Pass any other failure reason up to the ciEnv.
 127       // Note that serious, irreversible failures are already logged
 128       // on the ciEnv via env->record_method_not_compilable().
 129       env->record_failure(C.failure_reason());
 130     }
 131     if (StressRecompilation) {
 132       if (subsume_loads) {
 133         subsume_loads = false;
 134         continue;  // retry
 135       }
 136       if (do_escape_analysis) {
 137         do_escape_analysis = false;
 138         continue;  // retry
 139       }
 140     }
 141 
 142     // No retry; just break the loop.
 143     break;
 144   }
 145 }
 146 
 147 
 148 void C2Compiler::print_timers() {
 149   // do nothing
 150 }