compilationPolicy.hpp revision 0:a61af66fc99e
1/* 2 * Copyright 2000-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25// The CompilationPolicy selects which method (if any) should be compiled. 26// It also decides which methods must always be compiled (i.e., are never 27// interpreted). 28 29class CompilationPolicy : public CHeapObj { 30 private: 31 static CompilationPolicy* _policy; 32 // Accumulated time 33 static elapsedTimer _accumulated_time; 34 35 static bool _in_vm_startup; 36 37 public: 38 virtual void method_invocation_event(methodHandle m, TRAPS) = 0; 39 virtual void method_back_branch_event(methodHandle m, int branch_bci, int loop_top_bci, TRAPS) = 0; 40 virtual int compilation_level(methodHandle m, int branch_bci) = 0; 41 42 void reset_counter_for_invocation_event(methodHandle method); 43 void reset_counter_for_back_branch_event(methodHandle method); 44 45 static void set_in_vm_startup(bool in_vm_startup) { _in_vm_startup = in_vm_startup; } 46 static void completed_vm_startup(); 47 static bool delayCompilationDuringStartup() { return _in_vm_startup; } 48 49 static bool mustBeCompiled(methodHandle m); // m must be compiled before executing it 50 static bool canBeCompiled(methodHandle m); // m is allowed to be compiled 51 52 static void set_policy(CompilationPolicy* policy) { _policy = policy; } 53 static CompilationPolicy* policy() { return _policy; } 54 55 // Profiling 56 elapsedTimer* accumulated_time() { return &_accumulated_time; } 57 void print_time() PRODUCT_RETURN; 58}; 59 60class SimpleCompPolicy : public CompilationPolicy { 61 public: 62 void method_invocation_event( methodHandle m, TRAPS); 63 void method_back_branch_event(methodHandle m, int branch_bci, int loop_top_bci, TRAPS); 64 int compilation_level(methodHandle m, int branch_bci); 65}; 66 67// StackWalkCompPolicy - existing C2 policy 68 69#ifdef COMPILER2 70class StackWalkCompPolicy : public CompilationPolicy { 71 public: 72 void method_invocation_event(methodHandle m, TRAPS); 73 void method_back_branch_event(methodHandle m, int branch_bci, int loop_top_bci, TRAPS); 74 int compilation_level(methodHandle m, int branch_bci); 75 76 private: 77 RFrame* findTopInlinableFrame(GrowableArray<RFrame*>* stack); 78 RFrame* senderOf(RFrame* rf, GrowableArray<RFrame*>* stack); 79 80 // the following variables hold values computed by the last inlining decision 81 // they are used for performance debugging only (print better messages) 82 static const char* _msg; // reason for not inlining 83 84 static const char* shouldInline (methodHandle callee, float frequency, int cnt); 85 // positive filter: should send be inlined? returns NULL (--> yes) or rejection msg 86 static const char* shouldNotInline(methodHandle callee); 87 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg 88 89}; 90#endif 91