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 #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 const char* C2Compiler::retry_class_loading_during_parsing() {
  53   return "retry class loading during parsing";
  54 }
  55 bool C2Compiler::init_c2_runtime() {
  56 
  57   // Check assumptions used while running ADLC
  58   Compile::adlc_verification();
  59   assert(REG_COUNT <= ConcreteRegisterImpl::number_of_registers, "incompatible register counts");
  60 
  61   for (int i = 0; i < ConcreteRegisterImpl::number_of_registers ; i++ ) {
  62       OptoReg::vm2opto[i] = OptoReg::Bad;
  63   }
  64 
  65   for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(REG_COUNT); i = OptoReg::add(i,1) ) {
  66     VMReg r = OptoReg::as_VMReg(i);
  67     if (r->is_valid()) {
  68       OptoReg::vm2opto[r->value()] = i;
  69     }
  70   }
  71 
  72   // Check that runtime and architecture description agree on callee-saved-floats
  73   bool callee_saved_floats = false;
  74   for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
  75     // Is there a callee-saved float or double?
  76     if( register_save_policy[i] == 'E' /* callee-saved */ &&
  77        (register_save_type[i] == Op_RegF || register_save_type[i] == Op_RegD) ) {
  78       callee_saved_floats = true;
  79     }
  80   }
  81 
  82   DEBUG_ONLY( Node::init_NodeProperty(); )
  83 
  84   Compile::pd_compiler2_init();
  85 
  86   CompilerThread* thread = CompilerThread::current();
  87 
  88   HandleMark handle_mark(thread);
  89   return OptoRuntime::generate(thread->env());
  90 }
  91 
  92 
  93 void C2Compiler::initialize() {
  94   // The first compiler thread that gets here will initialize the
  95   // small amount of global state (and runtime stubs) that C2 needs.
  96 
  97   // There is a race possible once at startup and then we're fine
  98 
  99   // Note that this is being called from a compiler thread not the
 100   // main startup thread.
 101   if (should_perform_init()) {
 102     bool successful = C2Compiler::init_c2_runtime();
 103     int new_state = (successful) ? initialized : failed;
 104     set_state(new_state);
 105   }
 106 }
 107 
 108 void C2Compiler::compile_method(ciEnv* env, ciMethod* target, int entry_bci) {
 109   assert(is_initialized(), "Compiler thread must be initialized");
 110 
 111   bool subsume_loads = SubsumeLoads;
 112   bool do_escape_analysis = DoEscapeAnalysis && !env->jvmti_can_access_local_variables();
 113   bool eliminate_boxing = EliminateAutoBox;
 114   while (!env->failing()) {
 115     // Attempt to compile while subsuming loads into machine instructions.
 116     Compile C(env, this, target, entry_bci, subsume_loads, do_escape_analysis, eliminate_boxing);
 117 
 118 
 119     // Check result and retry if appropriate.
 120     if (C.failure_reason() != NULL) {
 121       if (C.failure_reason_is(retry_class_loading_during_parsing())) {
 122         env->record_failure(C.failure_reason());
 123         continue;  // retry
 124       }
 125       if (C.failure_reason_is(retry_no_subsuming_loads())) {
 126         assert(subsume_loads, "must make progress");
 127         subsume_loads = false;
 128         continue;  // retry
 129       }
 130       if (C.failure_reason_is(retry_no_escape_analysis())) {
 131         assert(do_escape_analysis, "must make progress");
 132         do_escape_analysis = false;
 133         continue;  // retry
 134       }
 135       if (C.has_boxed_value()) {
 136         // Recompile without boxing elimination regardless failure reason.
 137         assert(eliminate_boxing, "must make progress");
 138         eliminate_boxing = false;
 139         continue;  // retry
 140       }
 141       // Pass any other failure reason up to the ciEnv.
 142       // Note that serious, irreversible failures are already logged
 143       // on the ciEnv via env->record_method_not_compilable().
 144       env->record_failure(C.failure_reason());
 145     }
 146     if (StressRecompilation) {
 147       if (subsume_loads) {
 148         subsume_loads = false;
 149         continue;  // retry
 150       }
 151       if (do_escape_analysis) {
 152         do_escape_analysis = false;
 153         continue;  // retry
 154       }
 155     }
 156 
 157     // No retry; just break the loop.
 158     break;
 159   }
 160 }
 161 
 162 
 163 void C2Compiler::print_timers() {
 164   // do nothing
 165 }