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 #ifndef SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP 26 #define SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP 27 28 #include "ci/compilerInterface.hpp" 29 #include "compiler/compilerDirectives.hpp" 30 31 typedef void (*initializer)(void); 32 33 #if INCLUDE_JVMCI 34 // Per-compiler statistics 35 class CompilerStatistics VALUE_OBJ_CLASS_SPEC { 36 friend class VMStructs; 37 38 class Data VALUE_OBJ_CLASS_SPEC { 39 friend class VMStructs; 40 public: 41 elapsedTimer _time; // time spent compiling 42 int _bytes; // number of bytecodes compiled, including inlined bytecodes 43 int _count; // number of compilations 44 Data() : _bytes(0), _count(0) {} 45 void update(elapsedTimer time, int bytes) { 46 _time.add(time); 47 _bytes += bytes; 48 _count++; 49 } 50 void reset() { 51 _time.reset(); 52 } 53 }; 54 55 public: 56 Data _standard; // stats for non-OSR compilations 57 Data _osr; // stats for OSR compilations 58 int _nmethods_size; // 59 int _nmethods_code_size; 60 int bytes_per_second() { 61 int bytes = _standard._bytes + _osr._bytes; 62 if (bytes == 0) { 63 return 0; 64 } 65 double seconds = _standard._time.seconds() + _osr._time.seconds(); 66 return seconds == 0.0 ? 0 : (int) (bytes / seconds); 67 } 68 CompilerStatistics() : _nmethods_size(0), _nmethods_code_size(0) {} 69 }; 70 #endif // INCLUDE_JVMCI 71 72 class AbstractCompiler : public CHeapObj<mtCompiler> { 73 private: 74 volatile int _num_compiler_threads; 75 76 protected: 77 volatile int _compiler_state; 78 // Used for tracking global state of compiler runtime initialization 79 enum { uninitialized, initializing, initialized, failed, shut_down }; 80 81 // This method returns true for the first compiler thread that reaches that methods. 82 // This thread will initialize the compiler runtime. 83 bool should_perform_init(); 84 85 // The (closed set) of concrete compiler classes. 86 enum Type { 87 none, 88 c1, 89 c2, 90 jvmci, 91 shark 92 }; 93 94 private: 95 Type _type; 96 97 #if INCLUDE_JVMCI 98 CompilerStatistics _stats; 99 #endif 100 101 public: 102 AbstractCompiler(Type type) : _type(type), _compiler_state(uninitialized), _num_compiler_threads(0) {} 103 104 // This function determines the compiler thread that will perform the 105 // shutdown of the corresponding compiler runtime. 106 bool should_perform_shutdown(); 107 108 // Name of this compiler 109 virtual const char* name() = 0; 110 111 // Missing feature tests 112 virtual bool supports_native() { return true; } 113 virtual bool supports_osr () { return true; } 114 virtual bool can_compile_method(const methodHandle& method) { return true; } 115 116 // Determine if the current compiler provides an intrinsic 117 // for method 'method'. An intrinsic is available if: 118 // - the intrinsic is enabled (by using the appropriate command-line flag, 119 // the command-line compile ommand, or a compiler directive) 120 // - the platform on which the VM is running supports the intrinsic 121 // (i.e., the platform provides the instructions necessary for the compiler 122 // to generate the intrinsic code). 123 // 124 // The directive provides the compilation context and includes pre-evaluated values 125 // dependent on VM flags, compile commands, and compiler directives. 126 // 127 // Usually, the compilation context is the caller of the method 'method'. 128 // The only case when for a non-recursive method 'method' the compilation context 129 // is not the caller of the 'method' (but it is the method itself) is 130 // java.lang.ref.Referene::get. 131 // For java.lang.ref.Reference::get, the intrinsic version is used 132 // instead of the compiled version so that the value in the referent 133 // field can be registered by the G1 pre-barrier code. The intrinsified 134 // version of Reference::get also adds a memory barrier to prevent 135 // commoning reads from the referent field across safepoint since GC 136 // can change the referent field's value. See Compile::Compile() 137 // in src/share/vm/opto/compile.cpp or 138 // GraphBuilder::GraphBuilder() in src/share/vm/c1/c1_GraphBuilder.cpp 139 // for more details. 140 141 virtual bool is_intrinsic_available(const methodHandle& method, DirectiveSet* directive) { 142 return is_intrinsic_supported(method) && 143 !directive->is_intrinsic_disabled(method) && 144 !vmIntrinsics::is_disabled_by_flags(method); 145 } 146 147 // Determines if an intrinsic is supported by the compiler, that is, 148 // the compiler provides the instructions necessary to generate 149 // the intrinsic code for method 'method'. 150 // 151 // The 'is_intrinsic_supported' method is a white list, that is, 152 // by default no intrinsics are supported by a compiler except 153 // the ones listed in the method. Overriding methods should conform 154 // to this behavior. 155 virtual bool is_intrinsic_supported(const methodHandle& method) { 156 return false; 157 } 158 159 // Compiler type queries. 160 bool is_c1() { return _type == c1; } 161 bool is_c2() { return _type == c2; } 162 bool is_jvmci() { return _type == jvmci; } 163 bool is_shark() { return _type == shark; } 164 165 // Extra tests to identify trivial methods for the tiered compilation policy. 166 virtual bool is_trivial(Method* method) { return false; } 167 168 // Customization 169 virtual void initialize () = 0; 170 171 void set_num_compiler_threads(int num) { _num_compiler_threads = num; } 172 int num_compiler_threads() { return _num_compiler_threads; } 173 174 // Get/set state of compiler objects 175 bool is_initialized() { return _compiler_state == initialized; } 176 bool is_failed () { return _compiler_state == failed;} 177 void set_state (int state); 178 void set_shut_down () { set_state(shut_down); } 179 // Compilation entry point for methods 180 virtual void compile_method(ciEnv* env, ciMethod* target, int entry_bci, DirectiveSet* directive) { 181 ShouldNotReachHere(); 182 } 183 184 185 // Print compilation timers and statistics 186 virtual void print_timers() { 187 ShouldNotReachHere(); 188 } 189 190 #if INCLUDE_JVMCI 191 CompilerStatistics* stats() { return &_stats; } 192 #endif 193 }; 194 195 #endif // SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP