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comparison src/share/vm/interpreter/invocationCounter.hpp @ 1783:d5d065957597

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6953144: Tiered compilation Summary: Infrastructure for tiered compilation support (interpreter + c1 + c2) for 32 and 64 bit. Simple tiered policy implementation. Reviewed-by: kvn, never, phh, twisti
author iveresov
date Fri, 03 Sep 2010 17:51:07 -0700
parents c18cbe5936b8
children f95d63e2154a
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1782:f353275af40e 1783:d5d065957597
1 /* 1 /*
2 * Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
41 number_of_carry_bits = 1, 41 number_of_carry_bits = 1,
42 number_of_noncount_bits = number_of_state_bits + number_of_carry_bits, 42 number_of_noncount_bits = number_of_state_bits + number_of_carry_bits,
43 number_of_count_bits = BitsPerInt - number_of_noncount_bits, 43 number_of_count_bits = BitsPerInt - number_of_noncount_bits,
44 state_limit = nth_bit(number_of_state_bits), 44 state_limit = nth_bit(number_of_state_bits),
45 count_grain = nth_bit(number_of_state_bits + number_of_carry_bits), 45 count_grain = nth_bit(number_of_state_bits + number_of_carry_bits),
46 count_limit = nth_bit(number_of_count_bits - 1),
47 carry_mask = right_n_bits(number_of_carry_bits) << number_of_state_bits, 46 carry_mask = right_n_bits(number_of_carry_bits) << number_of_state_bits,
48 state_mask = right_n_bits(number_of_state_bits), 47 state_mask = right_n_bits(number_of_state_bits),
49 status_mask = right_n_bits(number_of_state_bits + number_of_carry_bits), 48 status_mask = right_n_bits(number_of_state_bits + number_of_carry_bits),
50 count_mask = ((int)(-1) ^ status_mask) 49 count_mask = ((int)(-1) ^ status_mask)
51 }; 50 };
52 51
53 public: 52 public:
54 static int InterpreterInvocationLimit; // CompileThreshold scaled for interpreter use 53 static int InterpreterInvocationLimit; // CompileThreshold scaled for interpreter use
55 static int Tier1InvocationLimit; // CompileThreshold scaled for tier1 use
56 static int Tier1BackEdgeLimit; // BackEdgeThreshold scaled for tier1 use
57
58 static int InterpreterBackwardBranchLimit; // A separate threshold for on stack replacement 54 static int InterpreterBackwardBranchLimit; // A separate threshold for on stack replacement
59
60 static int InterpreterProfileLimit; // Profiling threshold scaled for interpreter use 55 static int InterpreterProfileLimit; // Profiling threshold scaled for interpreter use
61 56
62 typedef address (*Action)(methodHandle method, TRAPS); 57 typedef address (*Action)(methodHandle method, TRAPS);
63 58
64 enum PublicConstants { 59 enum PublicConstants {
65 count_increment = count_grain, // use this value to increment the 32bit _counter word 60 count_increment = count_grain, // use this value to increment the 32bit _counter word
66 count_mask_value = count_mask // use this value to mask the backedge counter 61 count_mask_value = count_mask, // use this value to mask the backedge counter
62 count_shift = number_of_noncount_bits,
63 count_limit = nth_bit(number_of_count_bits - 1)
67 }; 64 };
68 65
69 enum State { 66 enum State {
70 wait_for_nothing, // do nothing when count() > limit() 67 wait_for_nothing, // do nothing when count() > limit()
71 wait_for_compile, // introduce nmethod when count() > limit() 68 wait_for_compile, // introduce nmethod when count() > limit()
77 void init(); // sets state into original state 74 void init(); // sets state into original state
78 void set_state(State state); // sets state and initializes counter correspondingly 75 void set_state(State state); // sets state and initializes counter correspondingly
79 inline void set(State state, int count); // sets state and counter 76 inline void set(State state, int count); // sets state and counter
80 inline void decay(); // decay counter (divide by two) 77 inline void decay(); // decay counter (divide by two)
81 void set_carry(); // set the sticky carry bit 78 void set_carry(); // set the sticky carry bit
79 void set_carry_flag() { _counter |= carry_mask; }
82 80
83 // Accessors 81 // Accessors
84 State state() const { return (State)(_counter & state_mask); } 82 State state() const { return (State)(_counter & state_mask); }
85 bool carry() const { return (_counter & carry_mask) != 0; } 83 bool carry() const { return (_counter & carry_mask) != 0; }
86 int limit() const { return CompileThreshold; } 84 int limit() const { return CompileThreshold; }
133 int new_count = c >> 1; 131 int new_count = c >> 1;
134 // prevent from going to zero, to distinguish from never-executed methods 132 // prevent from going to zero, to distinguish from never-executed methods
135 if (c > 0 && new_count == 0) new_count = 1; 133 if (c > 0 && new_count == 0) new_count = 1;
136 set(state(), new_count); 134 set(state(), new_count);
137 } 135 }
136