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 #include "compiler/compilerDirectives.hpp" 30 31 class AbstractCompiler : public CHeapObj<mtCompiler> { 32 private: 33 volatile int _num_compiler_threads; 34 35 protected: 36 volatile int _compiler_state; 37 // Used for tracking global state of compiler runtime initialization 38 enum { uninitialized, initializing, initialized, failed, shut_down }; 39 40 // This method returns true for the first compiler thread that reaches that methods. 41 // This thread will initialize the compiler runtime. 42 bool should_perform_init(); 43 44 // The (closed set) of concrete compiler classes. 45 enum Type { 46 none, 47 c1, 48 c2, 49 shark 50 }; 51 52 private: 53 Type _type; 54 55 public: 56 AbstractCompiler(Type type) : _type(type), _compiler_state(uninitialized), _num_compiler_threads(0) {} 57 58 // This function determines the compiler thread that will perform the 59 // shutdown of the corresponding compiler runtime. 60 bool should_perform_shutdown(); 61 62 // Name of this compiler 63 virtual const char* name() = 0; 64 65 // Missing feature tests 66 virtual bool supports_native() { return true; } 67 virtual bool supports_osr () { return true; } 68 virtual bool can_compile_method(methodHandle method) { return true; } 69 70 // Determine if the current compiler provides an intrinsic 71 // for method 'method'. An intrinsic is available if: 72 // - the intrinsic is enabled (by using the appropriate command-line flag) and 73 // - the platform on which the VM is running supports the intrinsic 74 // (i.e., the platform provides the instructions necessary for the compiler 75 // to generate the intrinsic code). 76 // 77 // The second parameter, 'compilation_context', is needed to implement functionality 78 // related to the DisableIntrinsic command-line flag. The DisableIntrinsic flag can 79 // be used to prohibit the compilers to use an intrinsic. There are three ways to 80 // disable an intrinsic using the DisableIntrinsic flag: 81 // 82 // (1) -XX:DisableIntrinsic=_hashCode,_getClass 83 // Disables intrinsification of _hashCode and _getClass globally 84 // (i.e., the intrinsified version the methods will not be used at all). 85 // (2) -XX:CompileCommand=option,aClass::aMethod,ccstr,DisableIntrinsic,_hashCode 86 // Disables intrinsification of _hashCode if it is called from 87 // aClass::aMethod (but not for any other call site of _hashCode) 88 // (3) -XX:CompileCommand=option,java.lang.ref.Reference::get,ccstr,DisableIntrinsic,_Reference_get 89 // Some methods are not compiled by C2. Instead, the C2 compiler 90 // returns directly the intrinsified version of these methods. 91 // The command above forces C2 to compile _Reference_get, but 92 // allows using the intrinsified version of _Reference_get at all 93 // other call sites. 94 // 95 // From the modes above, (1) disable intrinsics globally, (2) and (3) 96 // disable intrinsics on a per-method basis. In cases (2) and (3) the 97 // compilation context is aClass::aMethod and java.lang.ref.Reference::get, 98 // respectively. 99 virtual bool is_intrinsic_available(methodHandle method, DirectiveSet* directive) { 100 return is_intrinsic_supported(method) && 101 !directive->is_intrinsic_disabled(method) && 102 !vmIntrinsics::is_disabled_by_flags(method); 103 } 104 105 // Determines if an intrinsic is supported by the compiler, that is, 106 // the compiler provides the instructions necessary to generate 107 // the intrinsic code for method 'method'. 108 // 109 // The 'is_intrinsic_supported' method is a white list, that is, 110 // by default no intrinsics are supported by a compiler except 111 // the ones listed in the method. Overriding methods should conform 112 // to this behavior. 113 virtual bool is_intrinsic_supported(methodHandle method) { 114 return false; 115 } 116 117 // Compiler type queries. 118 bool is_c1() { return _type == c1; } 119 bool is_c2() { return _type == c2; } 120 bool is_shark() { return _type == shark; } 121 122 // Customization 123 virtual void initialize () = 0; 124 125 void set_num_compiler_threads(int num) { _num_compiler_threads = num; } 126 int num_compiler_threads() { return _num_compiler_threads; } 127 128 // Get/set state of compiler objects 129 bool is_initialized() { return _compiler_state == initialized; } 130 bool is_failed () { return _compiler_state == failed;} 131 void set_state (int state); 132 void set_shut_down () { set_state(shut_down); } 133 // Compilation entry point for methods 134 virtual void compile_method(ciEnv* env, ciMethod* target, int entry_bci, DirectiveSet* directive) { 135 ShouldNotReachHere(); 136 } 137 138 139 // Print compilation timers and statistics 140 virtual void print_timers() { 141 ShouldNotReachHere(); 142 } 143 }; 144 145 #endif // SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP