Martin Stjernholm | c15e7e4 | 2020-12-02 22:50:53 +0000 | [diff] [blame] | 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 size_t kPageSize = 4096; |
| 40 | |
Fairphone ODM | 25c12f5 | 2023-12-15 17:24:06 +0800 | [diff] [blame] | 41 | // TODO: Kernels for arm and x86 in both, 32-bit and 64-bit modes use 512 entries per page-table |
| 42 | // page. Find a way to confirm that in userspace. |
| 43 | // Address range covered by 1 Page Middle Directory (PMD) entry in the page table |
| 44 | static constexpr size_t kPMDSize = (kPageSize / sizeof(uint64_t)) * kPageSize; |
| 45 | // Address range covered by 1 Page Upper Directory (PUD) entry in the page table |
| 46 | static constexpr size_t kPUDSize = (kPageSize / sizeof(uint64_t)) * kPMDSize; |
| 47 | // Returns the ideal alignment corresponding to page-table levels for the |
| 48 | // given size. |
| 49 | static constexpr size_t BestPageTableAlignment(size_t size) { |
| 50 | return size < kPUDSize ? kPMDSize : kPUDSize; |
| 51 | } |
Martin Stjernholm | c15e7e4 | 2020-12-02 22:50:53 +0000 | [diff] [blame] | 52 | // Clion, clang analyzer, etc can falsely believe that "if (kIsDebugBuild)" always |
| 53 | // returns the same value. By wrapping into a call to another constexpr function, we force it |
| 54 | // to realize that is not actually always evaluating to the same value. |
| 55 | static constexpr bool GlobalsReturnSelf(bool self) { return self; } |
| 56 | |
| 57 | // Whether or not this is a debug build. Useful in conditionals where NDEBUG isn't. |
| 58 | // TODO: Use only __clang_analyzer__ here. b/64455231 |
| 59 | #if defined(NDEBUG) && !defined(__CLION_IDE__) |
| 60 | static constexpr bool kIsDebugBuild = GlobalsReturnSelf(false); |
| 61 | #else |
| 62 | static constexpr bool kIsDebugBuild = GlobalsReturnSelf(true); |
| 63 | #endif |
| 64 | |
| 65 | #if defined(ART_PGO_INSTRUMENTATION) |
| 66 | static constexpr bool kIsPGOInstrumentation = true; |
| 67 | #else |
| 68 | static constexpr bool kIsPGOInstrumentation = false; |
| 69 | #endif |
| 70 | |
| 71 | // ART_TARGET - Defined for target builds of ART. |
| 72 | // ART_TARGET_LINUX - Defined for target Linux builds of ART. |
| 73 | // ART_TARGET_ANDROID - Defined for target Android builds of ART. |
| 74 | // ART_TARGET_FUCHSIA - Defined for Fuchsia builds of ART. |
| 75 | // Note: Either ART_TARGET_LINUX, ART_TARGET_ANDROID or ART_TARGET_FUCHSIA |
| 76 | // need to be set when ART_TARGET is set. |
| 77 | // Note: When ART_TARGET_LINUX is defined mem_map.h will not be using Ashmem for memory mappings |
| 78 | // (usually only available on Android kernels). |
| 79 | #if defined(ART_TARGET) |
| 80 | // Useful in conditionals where ART_TARGET isn't. |
| 81 | static constexpr bool kIsTargetBuild = true; |
| 82 | # if defined(ART_TARGET_LINUX) |
| 83 | static constexpr bool kIsTargetLinux = true; |
| 84 | static constexpr bool kIsTargetFuchsia = false; |
satayev | 499be97 | 2022-05-13 15:05:39 +0000 | [diff] [blame] | 85 | static constexpr bool kIsTargetAndroid = false; |
Martin Stjernholm | c15e7e4 | 2020-12-02 22:50:53 +0000 | [diff] [blame] | 86 | # elif defined(ART_TARGET_ANDROID) |
| 87 | static constexpr bool kIsTargetLinux = false; |
| 88 | static constexpr bool kIsTargetFuchsia = false; |
satayev | 499be97 | 2022-05-13 15:05:39 +0000 | [diff] [blame] | 89 | static constexpr bool kIsTargetAndroid = true; |
Martin Stjernholm | c15e7e4 | 2020-12-02 22:50:53 +0000 | [diff] [blame] | 90 | # elif defined(ART_TARGET_FUCHSIA) |
| 91 | static constexpr bool kIsTargetLinux = false; |
| 92 | static constexpr bool kIsTargetFuchsia = true; |
satayev | 499be97 | 2022-05-13 15:05:39 +0000 | [diff] [blame] | 93 | static constexpr bool kIsTargetAndroid = false; |
Martin Stjernholm | c15e7e4 | 2020-12-02 22:50:53 +0000 | [diff] [blame] | 94 | # else |
| 95 | # error "Either ART_TARGET_LINUX, ART_TARGET_ANDROID or ART_TARGET_FUCHSIA " \ |
| 96 | "needs to be defined for target builds." |
| 97 | # endif |
| 98 | #else |
| 99 | static constexpr bool kIsTargetBuild = false; |
| 100 | # if defined(ART_TARGET_LINUX) |
| 101 | # error "ART_TARGET_LINUX defined for host build." |
| 102 | # elif defined(ART_TARGET_ANDROID) |
| 103 | # error "ART_TARGET_ANDROID defined for host build." |
| 104 | # elif defined(ART_TARGET_FUCHSIA) |
| 105 | # error "ART_TARGET_FUCHSIA defined for host build." |
| 106 | # else |
| 107 | static constexpr bool kIsTargetLinux = false; |
| 108 | static constexpr bool kIsTargetFuchsia = false; |
satayev | 499be97 | 2022-05-13 15:05:39 +0000 | [diff] [blame] | 109 | static constexpr bool kIsTargetAndroid = false; |
Martin Stjernholm | c15e7e4 | 2020-12-02 22:50:53 +0000 | [diff] [blame] | 110 | # endif |
| 111 | #endif |
| 112 | |
| 113 | // Additional statically-linked ART binaries (dex2oats, oatdumps, etc.) are |
| 114 | // always available on the host |
| 115 | #if !defined(ART_TARGET) |
| 116 | static constexpr bool kHostStaticBuildEnabled = true; |
| 117 | #else |
| 118 | static constexpr bool kHostStaticBuildEnabled = false; |
| 119 | #endif |
| 120 | |
Fairphone ODM | 25c12f5 | 2023-12-15 17:24:06 +0800 | [diff] [blame] | 121 | // System property for phenotype flag to test disabling compact dex and in |
| 122 | // particular dexlayout. |
| 123 | // TODO(b/256664509): Clean this up. |
| 124 | static constexpr char kPhDisableCompactDex[] = |
| 125 | "persist.device_config.runtime_native_boot.disable_compact_dex"; |
| 126 | |
Martin Stjernholm | c15e7e4 | 2020-12-02 22:50:53 +0000 | [diff] [blame] | 127 | } // namespace art |
| 128 | |
| 129 | #endif // ART_LIBARTBASE_BASE_GLOBALS_H_ |