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109 lines
3.9 KiB
109 lines
3.9 KiB
/*
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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_LIBARTBASE_BASE_GLOBALS_H_
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#define ART_LIBARTBASE_BASE_GLOBALS_H_
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#include <stddef.h>
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#include <stdint.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 size_t kPageSize = 4096;
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// Clion, clang analyzer, etc can falsely believe that "if (kIsDebugBuild)" always
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// returns the same value. By wrapping into a call to another constexpr function, we force it
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// to realize that is not actually always evaluating to the same value.
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static constexpr bool GlobalsReturnSelf(bool self) { return self; }
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// Whether or not this is a debug build. Useful in conditionals where NDEBUG isn't.
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// TODO: Use only __clang_analyzer__ here. b/64455231
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#if defined(NDEBUG) && !defined(__CLION_IDE__)
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static constexpr bool kIsDebugBuild = GlobalsReturnSelf(false);
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#else
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static constexpr bool kIsDebugBuild = GlobalsReturnSelf(true);
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#endif
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#if defined(ART_PGO_INSTRUMENTATION)
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static constexpr bool kIsPGOInstrumentation = true;
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#else
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static constexpr bool kIsPGOInstrumentation = false;
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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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// ART_TARGET_FUCHSIA - Defined for Fuchsia builds of ART.
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// Note: Either ART_TARGET_LINUX, ART_TARGET_ANDROID or ART_TARGET_FUCHSIA
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// 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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static constexpr bool kIsTargetFuchsia = false;
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# elif defined(ART_TARGET_ANDROID)
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static constexpr bool kIsTargetLinux = false;
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static constexpr bool kIsTargetFuchsia = false;
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# elif defined(ART_TARGET_FUCHSIA)
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static constexpr bool kIsTargetLinux = false;
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static constexpr bool kIsTargetFuchsia = true;
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# else
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# error "Either ART_TARGET_LINUX, ART_TARGET_ANDROID or ART_TARGET_FUCHSIA " \
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"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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# elif defined(ART_TARGET_FUCHSIA)
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# error "ART_TARGET_FUCHSIA defined for host build."
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# else
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static constexpr bool kIsTargetLinux = false;
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static constexpr bool kIsTargetFuchsia = 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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} // namespace art
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#endif // ART_LIBARTBASE_BASE_GLOBALS_H_
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