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* Copyright (C) 2011 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <stddef.h>
#include <stdint.h>
#include "read_barrier_c.h"
#include "read_barrier_option.h"
namespace art {
static constexpr size_t KB = 1024;
static constexpr size_t MB = KB * KB;
static constexpr size_t GB = KB * KB * KB;
// Runtime sizes.
static constexpr size_t kBitsPerByte = 8;
static constexpr size_t kBitsPerByteLog2 = 3;
static constexpr int kBitsPerIntPtrT = sizeof(intptr_t) * kBitsPerByte;
// Required stack alignment
static constexpr size_t kStackAlignment = 16;
// System page size. We check this against sysconf(_SC_PAGE_SIZE) at runtime, but use a simple
// compile-time constant so the compiler can generate better code.
static constexpr int kPageSize = 4096;
// Required object alignment
static constexpr size_t kObjectAlignment = 8;
static constexpr size_t kLargeObjectAlignment = kPageSize;
// Whether or not this is a debug build. Useful in conditionals where NDEBUG isn't.
#if defined(NDEBUG)
static constexpr bool kIsDebugBuild = false;
static constexpr bool kIsDebugBuild = true;
// Whether or not this is a target (vs host) build. Useful in conditionals where ART_TARGET isn't.
#if defined(ART_TARGET)
static constexpr bool kIsTargetBuild = true;
static constexpr bool kIsTargetBuild = false;
// Garbage collector constants.
static constexpr bool kMovingCollector = true;
static constexpr bool kMarkCompactSupport = false && kMovingCollector;
// True if we allow moving classes.
static constexpr bool kMovingClasses = !kMarkCompactSupport;
// If true, the quick compiler embeds class pointers in the compiled
// code, if possible.
static constexpr bool kEmbedClassInCode = true;
static constexpr bool kUseBakerReadBarrier = true;
static constexpr bool kUseBakerReadBarrier = false;
static constexpr bool kUseBrooksReadBarrier = true;
static constexpr bool kUseBrooksReadBarrier = false;
static constexpr bool kUseTableLookupReadBarrier = true;
static constexpr bool kUseTableLookupReadBarrier = false;
static constexpr bool kUseBakerOrBrooksReadBarrier = kUseBakerReadBarrier || kUseBrooksReadBarrier;
static constexpr bool kUseReadBarrier =
kUseBakerReadBarrier || kUseBrooksReadBarrier || kUseTableLookupReadBarrier;
// Debugging flag that forces the generation of read barriers, but
// does not trigger the use of the concurrent copying GC.
// TODO: Remove this flag when the read barriers compiler
// instrumentation is completed.
static constexpr bool kForceReadBarrier = false;
// TODO: Likewise, remove this flag when kForceReadBarrier is removed
// and replace it with kUseReadBarrier.
static constexpr bool kEmitCompilerReadBarrier = kForceReadBarrier || kUseReadBarrier;
// If true, references within the heap are poisoned (negated).
static constexpr bool kPoisonHeapReferences = true;
static constexpr bool kPoisonHeapReferences = false;
// If true, enable the tlab allocator by default.
static constexpr bool kUseTlab = true;
static constexpr bool kUseTlab = false;
// Kinds of tracing clocks.
enum class TraceClockSource {
kDual, // Both wall and thread CPU clocks.
#if defined(__linux__)
static constexpr TraceClockSource kDefaultTraceClockSource = TraceClockSource::kDual;
static constexpr TraceClockSource kDefaultTraceClockSource = TraceClockSource::kWall;
static constexpr bool kDefaultMustRelocate = true;
static constexpr bool kArm32QuickCodeUseSoftFloat = false;
} // namespace art