1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_LIBARTBASE_BASE_GLOBALS_H_ 18 #define ART_LIBARTBASE_BASE_GLOBALS_H_ 19 20 #include <stddef.h> 21 #include <stdint.h> 22 23 namespace art { 24 25 static constexpr size_t KB = 1024; 26 static constexpr size_t MB = KB * KB; 27 static constexpr size_t GB = KB * KB * KB; 28 29 // Runtime sizes. 30 static constexpr size_t kBitsPerByte = 8; 31 static constexpr size_t kBitsPerByteLog2 = 3; 32 static constexpr int kBitsPerIntPtrT = sizeof(intptr_t) * kBitsPerByte; 33 34 // Required stack alignment 35 static constexpr size_t kStackAlignment = 16; 36 37 // System page size. We check this against sysconf(_SC_PAGE_SIZE) at runtime, but use a simple 38 // compile-time constant so the compiler can generate better code. 39 static constexpr int kPageSize = 4096; 40 41 // Clion, clang analyzer, etc can falsely believe that "if (kIsDebugBuild)" always 42 // returns the same value. By wrapping into a call to another constexpr function, we force it 43 // to realize that is not actually always evaluating to the same value. 44 static constexpr bool GlobalsReturnSelf(bool self) { return self; } 45 46 // Whether or not this is a debug build. Useful in conditionals where NDEBUG isn't. 47 // TODO: Use only __clang_analyzer__ here. b/64455231 48 #if defined(NDEBUG) && !defined(__CLION_IDE__) 49 static constexpr bool kIsDebugBuild = GlobalsReturnSelf(false); 50 #else 51 static constexpr bool kIsDebugBuild = GlobalsReturnSelf(true); 52 #endif 53 54 #if defined(ART_PGO_INSTRUMENTATION) 55 static constexpr bool kIsPGOInstrumentation = true; 56 #else 57 static constexpr bool kIsPGOInstrumentation = false; 58 #endif 59 60 // ART_TARGET - Defined for target builds of ART. 61 // ART_TARGET_LINUX - Defined for target Linux builds of ART. 62 // ART_TARGET_ANDROID - Defined for target Android builds of ART. 63 // ART_TARGET_FUCHSIA - Defined for Fuchsia builds of ART. 64 // Note: Either ART_TARGET_LINUX, ART_TARGET_ANDROID or ART_TARGET_FUCHSIA 65 // need to be set when ART_TARGET is set. 66 // Note: When ART_TARGET_LINUX is defined mem_map.h will not be using Ashmem for memory mappings 67 // (usually only available on Android kernels). 68 #if defined(ART_TARGET) 69 // Useful in conditionals where ART_TARGET isn't. 70 static constexpr bool kIsTargetBuild = true; 71 # if defined(ART_TARGET_LINUX) 72 static constexpr bool kIsTargetLinux = true; 73 static constexpr bool kIsTargetFuchsia = false; 74 # elif defined(ART_TARGET_ANDROID) 75 static constexpr bool kIsTargetLinux = false; 76 static constexpr bool kIsTargetFuchsia = false; 77 # elif defined(ART_TARGET_FUCHSIA) 78 static constexpr bool kIsTargetLinux = false; 79 static constexpr bool kIsTargetFuchsia = true; 80 # else 81 # error "Either ART_TARGET_LINUX, ART_TARGET_ANDROID or ART_TARGET_FUCHSIA " \ 82 "needs to be defined for target builds." 83 # endif 84 #else 85 static constexpr bool kIsTargetBuild = false; 86 # if defined(ART_TARGET_LINUX) 87 # error "ART_TARGET_LINUX defined for host build." 88 # elif defined(ART_TARGET_ANDROID) 89 # error "ART_TARGET_ANDROID defined for host build." 90 # elif defined(ART_TARGET_FUCHSIA) 91 # error "ART_TARGET_FUCHSIA defined for host build." 92 # else 93 static constexpr bool kIsTargetLinux = false; 94 static constexpr bool kIsTargetFuchsia = false; 95 # endif 96 #endif 97 98 // Additional statically-linked ART binaries (dex2oats, oatdumps, etc.) are 99 // always available on the host 100 #if !defined(ART_TARGET) 101 static constexpr bool kHostStaticBuildEnabled = true; 102 #else 103 static constexpr bool kHostStaticBuildEnabled = false; 104 #endif 105 106 } // namespace art 107 108 #endif // ART_LIBARTBASE_BASE_GLOBALS_H_ 109
