91 lines
3.0 KiB
C
91 lines
3.0 KiB
C
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/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_RUNTIME_GLOBALS_H_
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#define ART_RUNTIME_RUNTIME_GLOBALS_H_
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#include "base/globals.h"
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namespace art {
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// Size of Dex virtual registers.
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static constexpr size_t kVRegSize = 4;
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// Returns whether the given memory offset can be used for generating
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// an implicit null check.
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static inline bool CanDoImplicitNullCheckOn(uintptr_t offset) {
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return offset < kPageSize;
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}
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// Required object alignment
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static constexpr size_t kObjectAlignmentShift = 3;
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static constexpr size_t kObjectAlignment = 1u << kObjectAlignmentShift;
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static constexpr size_t kLargeObjectAlignment = kPageSize;
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// Garbage collector constants.
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static constexpr bool kMovingCollector = true;
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static constexpr bool kMarkCompactSupport = false && kMovingCollector;
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// True if we allow moving classes.
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static constexpr bool kMovingClasses = !kMarkCompactSupport;
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// When using the Concurrent Copying (CC) collector, if
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// `ART_USE_GENERATIONAL_CC` is true, enable generational collection by default,
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// i.e. use sticky-bit CC for minor collections and (full) CC for major
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// collections.
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// This default value can be overridden with the runtime option
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// `-Xgc:[no]generational_cc`.
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//
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// TODO(b/67628039): Consider either:
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// - renaming this to a better descriptive name (e.g.
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// `ART_USE_GENERATIONAL_CC_BY_DEFAULT`); or
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// - removing `ART_USE_GENERATIONAL_CC` and having a fixed default value.
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// Any of these changes will require adjusting users of this preprocessor
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// directive and the corresponding build system environment variable (e.g. in
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// ART's continuous testing).
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#ifdef ART_USE_GENERATIONAL_CC
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static constexpr bool kEnableGenerationalCCByDefault = true;
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#else
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static constexpr bool kEnableGenerationalCCByDefault = false;
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#endif
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// If true, enable the tlab allocator by default.
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#ifdef ART_USE_TLAB
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static constexpr bool kUseTlab = true;
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#else
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static constexpr bool kUseTlab = false;
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#endif
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// Kinds of tracing clocks.
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enum class TraceClockSource {
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kThreadCpu,
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kWall,
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kDual, // Both wall and thread CPU clocks.
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};
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#if defined(__linux__)
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static constexpr TraceClockSource kDefaultTraceClockSource = TraceClockSource::kDual;
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#else
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static constexpr TraceClockSource kDefaultTraceClockSource = TraceClockSource::kWall;
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#endif
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static constexpr bool kDefaultMustRelocate = true;
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// Size of a heap reference.
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static constexpr size_t kHeapReferenceSize = sizeof(uint32_t);
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} // namespace art
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#endif // ART_RUNTIME_RUNTIME_GLOBALS_H_
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