1 /* 2 * Copyright (c) 1999, 2014, 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 30 class AbstractCompiler : public CHeapObj<mtCompiler> { 31 private: 32 volatile int _num_compiler_threads; 33 34 protected: 35 volatile int _compiler_state; 36 // Used for tracking global state of compiler runtime initialization 37 enum { uninitialized, initializing, initialized, failed, shut_down }; 38 39 // This method returns true for the first compiler thread that reaches that methods. 40 // This thread will initialize the compiler runtime. 41 bool should_perform_init(); 42 43 // The (closed set) of concrete compiler classes. 44 enum Type { 45 none, 46 c1, 47 c2, 48 shark 49 }; 50 51 private: 52 Type _type; 53 54 public: 55 AbstractCompiler(Type type) : _type(type), _compiler_state(uninitialized), _num_compiler_threads(0) {} 56 57 // This function determines the compiler thread that will perform the 58 // shutdown of the corresponding compiler runtime. 59 bool should_perform_shutdown(); 60 61 // Name of this compiler 62 virtual const char* name() = 0; 63 64 // Missing feature tests 65 virtual bool supports_native() { return true; } 66 virtual bool supports_osr () { return true; } 67 virtual bool can_compile_method(methodHandle method) { return true; } 68 69 // Determine if the current compiler provides an intrinsic 70 // for method 'method'. An intrinsic is available if: 71 // - the intrinsic is enabled (by using the appropriate command-line flag) and 72 // - the platform on which the VM is running supports the intrinsic 73 // (i.e., the platform provides the instructions necessary for the compiler 74 // to generate the intrinsic code). 75 // 76 // The second parameter, 'compilation_context', is needed to implement functionality 77 // related to the DisableIntrinsic command-line flag. The DisableIntrinsic flag can 78 // be used to prohibit the compilers to use an intrinsic. There are three ways to 79 // disable an intrinsic using the DisableIntrinsic flag: 80 // 81 // (1) -XX:DisableIntrinsic=_hashCode,_getClass 82 // Disables intrinsification of _hashCode and _getClass globally 83 // (i.e., the intrinsified version the methods will not be used at all). 84 // (2) -XX:CompileCommand=option,aClass::aMethod,ccstr,DisableIntrinsic,_hashCode 85 // Disables intrinsification of _hashCode if it is called from 86 // aClass::aMethod (but not for any other call site of _hashCode) 87 // (3) -XX:CompileCommand=option,java.lang.ref.Reference::get,ccstr,DisableIntrinsic,_Reference_get 88 // Some methods are not compiled by C2. Instead, the C2 compiler 89 // returns directly the intrinsified version of these methods. 90 // The command above forces C2 to compile _Reference_get, but 91 // allows using the intrinsified version of _Reference_get at all 92 // other call sites. 93 // 94 // From the modes above, (1) disable intrinsics globally, (2) and (3) 95 // disable intrinsics on a per-method basis. In cases (2) and (3) the 96 // compilation context is aClass::aMethod and java.lang.ref.Reference::get, 97 // respectively. 98 virtual bool is_intrinsic_available(methodHandle method, methodHandle compilation_context) { 99 return is_intrinsic_supported(method) && 100 !vmIntrinsics::is_disabled_by_flags(method, compilation_context); 101 } 102 103 // Determines if an intrinsic is supported by the compiler, that is, 104 // the compiler provides the instructions necessary to generate 105 // the intrinsic code for method 'method'. 106 // 107 // The 'is_intrinsic_supported' method is a white list, that is, 108 // by default no intrinsics are supported by a compiler except 109 // the ones listed in the method. Overriding methods should conform 110 // to this behavior. 111 virtual bool is_intrinsic_supported(methodHandle method) { 112 return false; 113 } 114 115 // Compiler type queries. 116 bool is_c1() { return _type == c1; } 117 bool is_c2() { return _type == c2; } 118 bool is_shark() { return _type == shark; } 119 120 // Customization 121 virtual void initialize () = 0; 122 123 void set_num_compiler_threads(int num) { _num_compiler_threads = num; } 124 int num_compiler_threads() { return _num_compiler_threads; } 125 126 // Get/set state of compiler objects 127 bool is_initialized() { return _compiler_state == initialized; } 128 bool is_failed () { return _compiler_state == failed;} 129 void set_state (int state); 130 void set_shut_down () { set_state(shut_down); } 131 // Compilation entry point for methods 132 virtual void compile_method(ciEnv* env, ciMethod* target, int entry_bci) { 133 ShouldNotReachHere(); 134 } 135 136 137 // Print compilation timers and statistics 138 virtual void print_timers() { 139 ShouldNotReachHere(); 140 } 141 }; 142 143 #endif // SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP