author | twisti |
Mon, 14 Dec 2015 17:02:02 -1000 | |
changeset 35123 | b0b89d83bcf5 |
parent 33163 | 9e128b399e48 |
child 37272 | c427db4ea8c4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_OOPS_METHODCOUNTERS_HPP |
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#define SHARE_VM_OOPS_METHODCOUNTERS_HPP |
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#include "oops/metadata.hpp" |
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#include "compiler/compilerOracle.hpp" |
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#include "interpreter/invocationCounter.hpp" |
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#include "runtime/arguments.hpp" |
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class MethodCounters: public MetaspaceObj { |
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friend class VMStructs; |
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friend class JVMCIVMStructs; |
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private: |
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int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) |
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u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting |
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u2 _number_of_breakpoints; // fullspeed debugging support |
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InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations |
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InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations |
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// NMethod age is a counter for warm methods detection in the code cache sweeper. |
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// The counter is reset by the sweeper and is decremented by some of the compiled |
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// code. The counter values are interpreted as follows: |
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// 1. (HotMethodDetection..INT_MAX] - initial value, no counters inserted |
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// 2. [1..HotMethodDetectionLimit) - the method is warm, the counter is used |
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// to figure out which methods can be flushed. |
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// 3. (INT_MIN..0] - method is hot and will deopt and get |
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// recompiled without the counters |
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int _nmethod_age; |
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int _interpreter_invocation_limit; // per-method InterpreterInvocationLimit |
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int _interpreter_backward_branch_limit; // per-method InterpreterBackwardBranchLimit |
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int _interpreter_profile_limit; // per-method InterpreterProfileLimit |
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int _invoke_mask; // per-method Tier0InvokeNotifyFreqLog |
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int _backedge_mask; // per-method Tier0BackedgeNotifyFreqLog |
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#ifdef TIERED |
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float _rate; // Events (invocation and backedge counter increments) per millisecond |
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jlong _prev_time; // Previous time the rate was acquired |
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u1 _highest_comp_level; // Highest compile level this method has ever seen. |
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u1 _highest_osr_comp_level; // Same for OSR level |
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#endif |
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MethodCounters(methodHandle mh) : _interpreter_invocation_count(0), |
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_interpreter_throwout_count(0), |
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_number_of_breakpoints(0), |
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_nmethod_age(INT_MAX) |
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#ifdef TIERED |
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, _rate(0), |
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_prev_time(0), |
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_highest_comp_level(0), |
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_highest_osr_comp_level(0) |
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#endif |
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{ |
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invocation_counter()->init(); |
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backedge_counter()->init(); |
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if (StressCodeAging) { |
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set_nmethod_age(HotMethodDetectionLimit); |
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} |
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// Set per-method thresholds. |
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double scale = 1.0; |
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CompilerOracle::has_option_value(mh, "CompileThresholdScaling", scale); |
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int compile_threshold = Arguments::scaled_compile_threshold(CompileThreshold, scale); |
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_interpreter_invocation_limit = compile_threshold << InvocationCounter::count_shift; |
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if (ProfileInterpreter) { |
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// If interpreter profiling is enabled, the backward branch limit |
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// is compared against the method data counter rather than an invocation |
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// counter, therefore no shifting of bits is required. |
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_interpreter_backward_branch_limit = (compile_threshold * (OnStackReplacePercentage - InterpreterProfilePercentage)) / 100; |
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} else { |
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_interpreter_backward_branch_limit = ((compile_threshold * OnStackReplacePercentage) / 100) << InvocationCounter::count_shift; |
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} |
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_interpreter_profile_limit = ((compile_threshold * InterpreterProfilePercentage) / 100) << InvocationCounter::count_shift; |
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_invoke_mask = right_n_bits(Arguments::scaled_freq_log(Tier0InvokeNotifyFreqLog, scale)) << InvocationCounter::count_shift; |
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_backedge_mask = right_n_bits(Arguments::scaled_freq_log(Tier0BackedgeNotifyFreqLog, scale)) << InvocationCounter::count_shift; |
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} |
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public: |
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static MethodCounters* allocate(methodHandle mh, TRAPS); |
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void deallocate_contents(ClassLoaderData* loader_data) {} |
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DEBUG_ONLY(bool on_stack() { return false; }) // for template |
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static int size() { return sizeof(MethodCounters) / wordSize; } |
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bool is_klass() const { return false; } |
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void clear_counters(); |
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int interpreter_invocation_count() { |
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return _interpreter_invocation_count; |
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} |
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void set_interpreter_invocation_count(int count) { |
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_interpreter_invocation_count = count; |
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} |
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int increment_interpreter_invocation_count() { |
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return ++_interpreter_invocation_count; |
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} |
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|
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void interpreter_throwout_increment() { |
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if (_interpreter_throwout_count < 65534) { |
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_interpreter_throwout_count++; |
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} |
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} |
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int interpreter_throwout_count() const { |
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return _interpreter_throwout_count; |
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} |
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void set_interpreter_throwout_count(int count) { |
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_interpreter_throwout_count = count; |
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} |
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|
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u2 number_of_breakpoints() const { return _number_of_breakpoints; } |
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void incr_number_of_breakpoints() { ++_number_of_breakpoints; } |
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void decr_number_of_breakpoints() { --_number_of_breakpoints; } |
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void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } |
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|
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#ifdef TIERED |
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jlong prev_time() const { return _prev_time; } |
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void set_prev_time(jlong time) { _prev_time = time; } |
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float rate() const { return _rate; } |
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void set_rate(float rate) { _rate = rate; } |
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#endif |
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|
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int highest_comp_level() const; |
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void set_highest_comp_level(int level); |
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int highest_osr_comp_level() const; |
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void set_highest_osr_comp_level(int level); |
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|
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// invocation counter |
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InvocationCounter* invocation_counter() { return &_invocation_counter; } |
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InvocationCounter* backedge_counter() { return &_backedge_counter; } |
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|
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int nmethod_age() { |
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return _nmethod_age; |
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} |
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void set_nmethod_age(int age) { |
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_nmethod_age = age; |
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} |
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void reset_nmethod_age() { |
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set_nmethod_age(HotMethodDetectionLimit); |
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} |
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|
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static bool is_nmethod_hot(int age) { return age <= 0; } |
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static bool is_nmethod_warm(int age) { return age < HotMethodDetectionLimit; } |
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static bool is_nmethod_age_unset(int age) { return age > HotMethodDetectionLimit; } |
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|
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static ByteSize nmethod_age_offset() { |
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return byte_offset_of(MethodCounters, _nmethod_age); |
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} |
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|
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static ByteSize interpreter_invocation_counter_offset() { |
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return byte_offset_of(MethodCounters, _interpreter_invocation_count); |
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} |
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|
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static ByteSize invocation_counter_offset() { |
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return byte_offset_of(MethodCounters, _invocation_counter); |
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} |
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|
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static ByteSize backedge_counter_offset() { |
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return byte_offset_of(MethodCounters, _backedge_counter); |
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} |
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|
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static int interpreter_invocation_counter_offset_in_bytes() { |
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return offset_of(MethodCounters, _interpreter_invocation_count); |
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} |
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|
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static ByteSize interpreter_invocation_limit_offset() { |
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return byte_offset_of(MethodCounters, _interpreter_invocation_limit); |
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} |
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|
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static ByteSize interpreter_backward_branch_limit_offset() { |
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return byte_offset_of(MethodCounters, _interpreter_backward_branch_limit); |
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} |
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|
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static ByteSize interpreter_profile_limit_offset() { |
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return byte_offset_of(MethodCounters, _interpreter_profile_limit); |
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} |
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|
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static ByteSize invoke_mask_offset() { |
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return byte_offset_of(MethodCounters, _invoke_mask); |
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} |
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|
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static ByteSize backedge_mask_offset() { |
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return byte_offset_of(MethodCounters, _backedge_mask); |
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} |
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}; |
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#endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP |