Mercurial > hg > truffle
annotate src/share/vm/interpreter/invocationCounter.hpp @ 4181:319860ae697a
Simplify FrameMap: make offsets of spill slots and outgoing parameters independent so that they can be allocated at the same time, eliminating the separate phases. This makes the separate StackBlock unnecesary. Change CiStackSlot to use byte offsets instead of spill slot index. This makes CiTarget.spillSlotSize unnecessary.
| author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
|---|---|
| date | Mon, 02 Jan 2012 14:16:08 -0800 |
| parents | f95d63e2154a |
| children | bd7a7ce2e264 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1783 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_INTERPRETER_INVOCATIONCOUNTER_HPP |
| 26 #define SHARE_VM_INTERPRETER_INVOCATIONCOUNTER_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #include "runtime/handles.hpp" | |
| 30 #include "utilities/exceptions.hpp" | |
| 31 | |
| 0 | 32 // InvocationCounters are used to trigger actions when a limit (threshold) is reached. |
| 33 // For different states, different limits and actions can be defined in the initialization | |
| 34 // routine of InvocationCounters. | |
| 35 // | |
| 36 // Implementation notes: For space reasons, state & counter are both encoded in one word, | |
| 37 // The state is encoded using some of the least significant bits, the counter is using the | |
| 38 // more significant bits. The counter is incremented before a method is activated and an | |
| 39 // action is triggered when when count() > limit(). | |
| 40 | |
| 41 class InvocationCounter VALUE_OBJ_CLASS_SPEC { | |
| 42 friend class VMStructs; | |
| 43 private: // bit no: |31 3| 2 | 1 0 | | |
| 44 unsigned int _counter; // format: [count|carry|state] | |
| 45 | |
| 46 enum PrivateConstants { | |
| 47 number_of_state_bits = 2, | |
| 48 number_of_carry_bits = 1, | |
| 49 number_of_noncount_bits = number_of_state_bits + number_of_carry_bits, | |
| 50 number_of_count_bits = BitsPerInt - number_of_noncount_bits, | |
| 51 state_limit = nth_bit(number_of_state_bits), | |
| 52 count_grain = nth_bit(number_of_state_bits + number_of_carry_bits), | |
| 53 carry_mask = right_n_bits(number_of_carry_bits) << number_of_state_bits, | |
| 54 state_mask = right_n_bits(number_of_state_bits), | |
| 55 status_mask = right_n_bits(number_of_state_bits + number_of_carry_bits), | |
| 56 count_mask = ((int)(-1) ^ status_mask) | |
| 57 }; | |
| 58 | |
| 59 public: | |
| 60 static int InterpreterInvocationLimit; // CompileThreshold scaled for interpreter use | |
| 61 static int InterpreterBackwardBranchLimit; // A separate threshold for on stack replacement | |
| 62 static int InterpreterProfileLimit; // Profiling threshold scaled for interpreter use | |
| 63 | |
| 64 typedef address (*Action)(methodHandle method, TRAPS); | |
| 65 | |
| 66 enum PublicConstants { | |
| 67 count_increment = count_grain, // use this value to increment the 32bit _counter word | |
| 1783 | 68 count_mask_value = count_mask, // use this value to mask the backedge counter |
| 69 count_shift = number_of_noncount_bits, | |
| 70 count_limit = nth_bit(number_of_count_bits - 1) | |
| 0 | 71 }; |
| 72 | |
| 73 enum State { | |
| 74 wait_for_nothing, // do nothing when count() > limit() | |
| 75 wait_for_compile, // introduce nmethod when count() > limit() | |
| 76 number_of_states // must be <= state_limit | |
| 77 }; | |
| 78 | |
| 79 // Manipulation | |
| 80 void reset(); // sets state to wait state | |
| 81 void init(); // sets state into original state | |
| 82 void set_state(State state); // sets state and initializes counter correspondingly | |
| 83 inline void set(State state, int count); // sets state and counter | |
| 84 inline void decay(); // decay counter (divide by two) | |
| 85 void set_carry(); // set the sticky carry bit | |
| 1783 | 86 void set_carry_flag() { _counter |= carry_mask; } |
| 0 | 87 |
| 88 // Accessors | |
| 89 State state() const { return (State)(_counter & state_mask); } | |
| 90 bool carry() const { return (_counter & carry_mask) != 0; } | |
| 91 int limit() const { return CompileThreshold; } | |
| 92 Action action() const { return _action[state()]; } | |
| 93 int count() const { return _counter >> number_of_noncount_bits; } | |
| 94 | |
| 95 int get_InvocationLimit() const { return InterpreterInvocationLimit >> number_of_noncount_bits; } | |
| 96 int get_BackwardBranchLimit() const { return InterpreterBackwardBranchLimit >> number_of_noncount_bits; } | |
| 97 int get_ProfileLimit() const { return InterpreterProfileLimit >> number_of_noncount_bits; } | |
| 98 | |
| 99 // Test counter using scaled limits like the asm interpreter would do rather than doing | |
| 100 // the shifts to normalize the counter. | |
| 101 | |
| 102 bool reached_InvocationLimit() const { return _counter >= (unsigned int) InterpreterInvocationLimit; } | |
| 103 bool reached_BackwardBranchLimit() const { return _counter >= (unsigned int) InterpreterBackwardBranchLimit; } | |
| 104 | |
| 105 // Do this just like asm interpreter does for max speed | |
| 106 bool reached_ProfileLimit(InvocationCounter *back_edge_count) const { | |
| 107 return (_counter && count_mask) + back_edge_count->_counter >= (unsigned int) InterpreterProfileLimit; | |
| 108 } | |
| 109 | |
| 110 void increment() { _counter += count_increment; } | |
| 111 | |
| 112 | |
| 113 // Printing | |
| 114 void print(); | |
| 115 void print_short(); | |
| 116 | |
| 117 // Miscellaneous | |
| 118 static ByteSize counter_offset() { return byte_offset_of(InvocationCounter, _counter); } | |
| 119 static void reinitialize(bool delay_overflow); | |
| 120 | |
| 121 private: | |
| 122 static int _init [number_of_states]; // the counter limits | |
| 123 static Action _action[number_of_states]; // the actions | |
| 124 | |
| 125 static void def(State state, int init, Action action); | |
| 126 static const char* state_as_string(State state); | |
| 127 static const char* state_as_short_string(State state); | |
| 128 }; | |
| 129 | |
| 130 inline void InvocationCounter::set(State state, int count) { | |
| 131 assert(0 <= state && state < number_of_states, "illegal state"); | |
| 132 int carry = (_counter & carry_mask); // the carry bit is sticky | |
| 133 _counter = (count << number_of_noncount_bits) | carry | state; | |
| 134 } | |
| 135 | |
| 136 inline void InvocationCounter::decay() { | |
| 137 int c = count(); | |
| 138 int new_count = c >> 1; | |
| 139 // prevent from going to zero, to distinguish from never-executed methods | |
| 140 if (c > 0 && new_count == 0) new_count = 1; | |
| 141 set(state(), new_count); | |
| 142 } | |
| 1783 | 143 |
| 1972 | 144 |
| 145 #endif // SHARE_VM_INTERPRETER_INVOCATIONCOUNTER_HPP |