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 #if defined AD_MD_HPP
  29 # include AD_MD_HPP
  30 #elif defined TARGET_ARCH_MODEL_x86_32
  31 # include "adfiles/ad_x86_32.hpp"
  32 #elif defined TARGET_ARCH_MODEL_x86_64
  33 # include "adfiles/ad_x86_64.hpp"
  34 #elif defined TARGET_ARCH_MODEL_sparc
  35 # include "adfiles/ad_sparc.hpp"
  36 #elif defined TARGET_ARCH_MODEL_zero
  37 # include "adfiles/ad_zero.hpp"
  38 #elif defined TARGET_ARCH_MODEL_ppc_64
  39 # include "adfiles/ad_ppc_64.hpp"
  40 #endif
  41 
  42 // register information defined by ADLC
  43 extern const char register_save_policy[];
  44 extern const int  register_save_type[];
  45 
  46 const char* C2Compiler::retry_no_subsuming_loads() {
  47   return "retry without subsuming loads";
  48 }
  49 const char* C2Compiler::retry_no_escape_analysis() {
  50   return "retry without escape analysis";
  51 }
  52 bool C2Compiler::init_c2_runtime() {
  53 
  54   // Check assumptions used while running ADLC
  55   Compile::adlc_verification();
  56   assert(REG_COUNT <= ConcreteRegisterImpl::number_of_registers, "incompatible register counts");
  57 
  58   for (int i = 0; i < ConcreteRegisterImpl::number_of_registers ; i++ ) {
  59       OptoReg::vm2opto[i] = OptoReg::Bad;
  60   }
  61 
  62   for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(REG_COUNT); i = OptoReg::add(i,1) ) {
  63     VMReg r = OptoReg::as_VMReg(i);
  64     if (r->is_valid()) {
  65       OptoReg::vm2opto[r->value()] = i;
  66     }
  67   }
  68 
  69   // Check that runtime and architecture description agree on callee-saved-floats
  70   bool callee_saved_floats = false;
  71   for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
  72     // Is there a callee-saved float or double?
  73     if( register_save_policy[i] == 'E' /* callee-saved */ &&
  74        (register_save_type[i] == Op_RegF || register_save_type[i] == Op_RegD) ) {
  75       callee_saved_floats = true;
  76     }
  77   }
  78 
  79   DEBUG_ONLY( Node::init_NodeProperty(); )
  80 
  81   Compile::pd_compiler2_init();
  82 
  83   CompilerThread* thread = CompilerThread::current();
  84 
  85   HandleMark handle_mark(thread);
  86   return OptoRuntime::generate(thread->env());
  87 }
  88 
  89 
  90 void C2Compiler::initialize() {
  91   // The first compiler thread that gets here will initialize the
  92   // small amount of global state (and runtime stubs) that C2 needs.
  93 
  94   // There is a race possible once at startup and then we're fine
  95 
  96   // Note that this is being called from a compiler thread not the
  97   // main startup thread.
  98   if (should_perform_init()) {
  99     bool successful = C2Compiler::init_c2_runtime();
 100     int new_state = (successful) ? initialized : failed;
 101     set_state(new_state);
 102   }
 103 }
 104 
 105 void C2Compiler::compile_method(ciEnv* env, ciMethod* target, int entry_bci) {
 106   assert(is_initialized(), "Compiler thread must be initialized");
 107 
 108   bool subsume_loads = SubsumeLoads;
 109   bool do_escape_analysis = DoEscapeAnalysis && !env->jvmti_can_access_local_variables();
 110   bool eliminate_boxing = EliminateAutoBox;
 111   while (!env->failing()) {
 112     // Attempt to compile while subsuming loads into machine instructions.
 113     Compile C(env, this, target, entry_bci, subsume_loads, do_escape_analysis, eliminate_boxing);
 114 
 115 
 116     // Check result and retry if appropriate.
 117     if (C.failure_reason() != NULL) {
 118       if (C.failure_reason_is(retry_no_subsuming_loads())) {
 119         assert(subsume_loads, "must make progress");
 120         subsume_loads = false;
 121         continue;  // retry
 122       }
 123       if (C.failure_reason_is(retry_no_escape_analysis())) {
 124         assert(do_escape_analysis, "must make progress");
 125         do_escape_analysis = false;
 126         continue;  // retry
 127       }
 128       if (C.has_boxed_value()) {
 129         // Recompile without boxing elimination regardless failure reason.
 130         assert(eliminate_boxing, "must make progress");
 131         eliminate_boxing = false;
 132         continue;  // retry
 133       }
 134       // Pass any other failure reason up to the ciEnv.
 135       // Note that serious, irreversible failures are already logged
 136       // on the ciEnv via env->record_method_not_compilable().
 137       env->record_failure(C.failure_reason());
 138     }
 139     if (StressRecompilation) {
 140       if (subsume_loads) {
 141         subsume_loads = false;
 142         continue;  // retry
 143       }
 144       if (do_escape_analysis) {
 145         do_escape_analysis = false;
 146         continue;  // retry
 147       }
 148     }
 149 
 150     // No retry; just break the loop.
 151     break;
 152   }
 153 }
 154 
 155 
 156 void C2Compiler::print_timers() {
 157   // do nothing
 158 }