180 lines
5.8 KiB
C++
180 lines
5.8 KiB
C++
/*
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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_GLOBALS_H_
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#define ART_RUNTIME_GLOBALS_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "read_barrier_c.h"
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#include "read_barrier_option.h"
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namespace art {
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static constexpr size_t KB = 1024;
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static constexpr size_t MB = KB * KB;
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static constexpr size_t GB = KB * KB * KB;
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// Runtime sizes.
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static constexpr size_t kBitsPerByte = 8;
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static constexpr size_t kBitsPerByteLog2 = 3;
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static constexpr int kBitsPerIntPtrT = sizeof(intptr_t) * kBitsPerByte;
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// Required stack alignment
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static constexpr size_t kStackAlignment = 16;
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// System page size. We check this against sysconf(_SC_PAGE_SIZE) at runtime, but use a simple
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// compile-time constant so the compiler can generate better code.
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static constexpr int kPageSize = 4096;
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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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// Whether or not this is a debug build. Useful in conditionals where NDEBUG isn't.
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#if defined(NDEBUG)
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static constexpr bool kIsDebugBuild = false;
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#else
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static constexpr bool kIsDebugBuild = true;
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#endif
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// ART_TARGET - Defined for target builds of ART.
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// ART_TARGET_LINUX - Defined for target Linux builds of ART.
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// ART_TARGET_ANDROID - Defined for target Android builds of ART.
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// Note: Either ART_TARGET_LINUX or ART_TARGET_ANDROID need to be set when ART_TARGET is set.
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// Note: When ART_TARGET_LINUX is defined mem_map.h will not be using Ashmem for memory mappings
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// (usually only available on Android kernels).
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#if defined(ART_TARGET)
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// Useful in conditionals where ART_TARGET isn't.
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static constexpr bool kIsTargetBuild = true;
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# if defined(ART_TARGET_LINUX)
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static constexpr bool kIsTargetLinux = true;
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# elif defined(ART_TARGET_ANDROID)
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static constexpr bool kIsTargetLinux = false;
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# else
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# error "Either ART_TARGET_LINUX or ART_TARGET_ANDROID needs to be defined for target builds."
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# endif
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#else
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static constexpr bool kIsTargetBuild = false;
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# if defined(ART_TARGET_LINUX)
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# error "ART_TARGET_LINUX defined for host build."
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# elif defined(ART_TARGET_ANDROID)
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# error "ART_TARGET_ANDROID defined for host build."
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# else
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static constexpr bool kIsTargetLinux = false;
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# endif
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#endif
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// Additional statically-linked ART binaries (dex2oats, oatdumps, etc.) are
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// always available on the host
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#if !defined(ART_TARGET)
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static constexpr bool kHostStaticBuildEnabled = true;
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#else
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static constexpr bool kHostStaticBuildEnabled = false;
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#endif
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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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// If true, the quick compiler embeds class pointers in the compiled
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// code, if possible.
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static constexpr bool kEmbedClassInCode = true;
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#ifdef USE_BAKER_READ_BARRIER
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static constexpr bool kUseBakerReadBarrier = true;
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#else
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static constexpr bool kUseBakerReadBarrier = false;
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#endif
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#ifdef USE_BROOKS_READ_BARRIER
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static constexpr bool kUseBrooksReadBarrier = true;
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#else
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static constexpr bool kUseBrooksReadBarrier = false;
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#endif
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#ifdef USE_TABLE_LOOKUP_READ_BARRIER
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static constexpr bool kUseTableLookupReadBarrier = true;
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#else
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static constexpr bool kUseTableLookupReadBarrier = false;
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#endif
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static constexpr bool kUseBakerOrBrooksReadBarrier = kUseBakerReadBarrier || kUseBrooksReadBarrier;
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static constexpr bool kUseReadBarrier =
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kUseBakerReadBarrier || kUseBrooksReadBarrier || kUseTableLookupReadBarrier;
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// Debugging flag that forces the generation of read barriers, but
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// does not trigger the use of the concurrent copying GC.
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//
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// TODO: Remove this flag when the read barriers compiler
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// instrumentation is completed.
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static constexpr bool kForceReadBarrier = false;
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// TODO: Likewise, remove this flag when kForceReadBarrier is removed
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// and replace it with kUseReadBarrier.
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static constexpr bool kEmitCompilerReadBarrier = kForceReadBarrier || kUseReadBarrier;
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// If true, references within the heap are poisoned (negated).
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#ifdef USE_HEAP_POISONING
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static constexpr bool kPoisonHeapReferences = true;
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#else
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static constexpr bool kPoisonHeapReferences = 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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static constexpr bool kArm32QuickCodeUseSoftFloat = false;
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#ifdef ART_ENABLE_VDEX
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static constexpr bool kIsVdexEnabled = true;
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#else
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static constexpr bool kIsVdexEnabled = false;
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#endif
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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_GLOBALS_H_
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