1 /*
   2  * Copyright (c) 1999, 2015, 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 #elif defined TARGET_ARCH_MODEL_aarch32
  41 # include "adfiles/ad_aarch32.hpp"
  42 #endif
  43 
  44 // register information defined by ADLC
  45 extern const char register_save_policy[];
  46 extern const int  register_save_type[];
  47 
  48 const char* C2Compiler::retry_no_subsuming_loads() {
  49   return "retry without subsuming loads";
  50 }
  51 const char* C2Compiler::retry_no_escape_analysis() {
  52   return "retry without escape analysis";
  53 }
  54 const char* C2Compiler::retry_class_loading_during_parsing() {
  55   return "retry class loading during parsing";
  56 }
  57 bool 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 
  95 void 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 
 110 void 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_class_loading_during_parsing())) {
 124         env->record_failure(C.failure_reason());
 125         continue;  // retry
 126       }
 127       if (C.failure_reason_is(retry_no_subsuming_loads())) {
 128         assert(subsume_loads, "must make progress");
 129         subsume_loads = false;
 130         continue;  // retry
 131       }
 132       if (C.failure_reason_is(retry_no_escape_analysis())) {
 133         assert(do_escape_analysis, "must make progress");
 134         do_escape_analysis = false;
 135         continue;  // retry
 136       }
 137       if (C.has_boxed_value()) {
 138         // Recompile without boxing elimination regardless failure reason.
 139         assert(eliminate_boxing, "must make progress");
 140         eliminate_boxing = false;
 141         continue;  // retry
 142       }
 143       // Pass any other failure reason up to the ciEnv.
 144       // Note that serious, irreversible failures are already logged
 145       // on the ciEnv via env->record_method_not_compilable().
 146       env->record_failure(C.failure_reason());
 147     }
 148     if (StressRecompilation) {
 149       if (subsume_loads) {
 150         subsume_loads = false;
 151         continue;  // retry
 152       }
 153       if (do_escape_analysis) {
 154         do_escape_analysis = false;
 155         continue;  // retry
 156       }
 157     }
 158 
 159     // No retry; just break the loop.
 160     break;
 161   }
 162 }
 163 
 164 
 165 void C2Compiler::print_timers() {
 166   // do nothing
 167 }