1692
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1 /*
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2 * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright 2008, 2009 Red Hat, Inc.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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26 class SharkContext;
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27
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28 class SharkCompiler : public AbstractCompiler {
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29 public:
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30 // Creation
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31 SharkCompiler();
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32
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33 // Name of this compiler
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34 const char *name() { return "shark"; }
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35
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36 // Missing feature tests
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37 bool supports_native() { return true; }
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38 bool supports_osr() { return true; }
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39
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40 // Customization
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41 bool needs_adapters() { return false; }
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42 bool needs_stubs() { return false; }
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43
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44 // Initialization
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45 void initialize();
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46
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47 // Compile a normal (bytecode) method and install it in the VM
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48 void compile_method(ciEnv* env, ciMethod* target, int entry_bci);
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49
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50 // Generate a wrapper for a native (JNI) method
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51 nmethod* generate_native_wrapper(MacroAssembler* masm,
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52 methodHandle target,
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53 BasicType* arg_types,
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54 BasicType return_type);
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55
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56 // Free compiled methods (and native wrappers)
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57 void free_compiled_method(address code);
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58
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59 // Each thread generating IR needs its own context. The normal
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60 // context is used for bytecode methods, and is protected from
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61 // multiple simultaneous accesses by being restricted to the
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62 // compiler thread. The native context is used for JNI methods,
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63 // and is protected from multiple simultaneous accesses by the
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64 // adapter handler library lock.
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65 private:
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66 SharkContext* _normal_context;
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67 SharkContext* _native_context;
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68
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69 public:
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70 SharkContext* context() const {
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71 if (JavaThread::current()->is_Compiler_thread()) {
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72 return _normal_context;
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73 }
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74 else {
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75 assert(AdapterHandlerLibrary_lock->owned_by_self(), "should be");
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76 return _native_context;
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77 }
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78 }
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79
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80 // The LLVM execution engine is the JIT we use to generate native
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81 // code. It is thread safe, but we need to protect it with a lock
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82 // of our own because otherwise LLVM's lock and HotSpot's locks
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83 // interleave and deadlock. The SharkMemoryManager is not thread
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84 // safe, and is protected by the same lock as the execution engine.
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85 private:
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86 Monitor* _execution_engine_lock;
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87 SharkMemoryManager* _memory_manager;
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88 llvm::ExecutionEngine* _execution_engine;
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89
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90 private:
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91 Monitor* execution_engine_lock() const {
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92 return _execution_engine_lock;
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93 }
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94 SharkMemoryManager* memory_manager() const {
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95 assert(execution_engine_lock()->owned_by_self(), "should be");
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96 return _memory_manager;
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97 }
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98 llvm::ExecutionEngine* execution_engine() const {
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99 assert(execution_engine_lock()->owned_by_self(), "should be");
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100 return _execution_engine;
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101 }
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102
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103 // Global access
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104 public:
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105 static SharkCompiler* compiler() {
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106 AbstractCompiler *compiler =
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107 CompileBroker::compiler(CompLevel_fast_compile);
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108 assert(compiler->is_shark() && compiler->is_initialized(), "should be");
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109 return (SharkCompiler *) compiler;
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110 }
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111
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112 // Helpers
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113 private:
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114 static const char* methodname(const char* klass, const char* method);
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115 void generate_native_code(SharkEntry* entry,
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116 llvm::Function* function,
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117 const char* name);
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118 void free_queued_methods();
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119 };
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