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Elliott Hughes2faa5f12012-01-30 14:42:07 -08001/*
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 */
Carl Shapiroa5d5cfd2011-06-21 12:46:59 -070016
Brian Carlstromfc0e3212013-07-17 14:40:12 -070017#ifndef ART_RUNTIME_GLOBALS_H_
18#define ART_RUNTIME_GLOBALS_H_
Carl Shapiroa5d5cfd2011-06-21 12:46:59 -070019
Carl Shapiro1fb86202011-06-27 17:43:13 -070020#include <stddef.h>
Carl Shapiroa5d5cfd2011-06-21 12:46:59 -070021#include <stdint.h>
Hiroshi Yamauchi9d04a202014-01-31 13:35:49 -080022#include "brooks_pointer.h"
Carl Shapiroa5d5cfd2011-06-21 12:46:59 -070023
Carl Shapiro6b6b5f02011-06-21 15:05:09 -070024namespace art {
Carl Shapiroa5d5cfd2011-06-21 12:46:59 -070025
26typedef uint8_t byte;
27typedef intptr_t word;
28typedef uintptr_t uword;
29
Mathieu Chartier50482232013-11-21 11:48:14 -080030static constexpr size_t KB = 1024;
31static constexpr size_t MB = KB * KB;
32static constexpr size_t GB = KB * KB * KB;
Carl Shapiroa5d5cfd2011-06-21 12:46:59 -070033
Mathieu Chartier50482232013-11-21 11:48:14 -080034static constexpr size_t kWordSize = sizeof(word);
35static constexpr size_t kPointerSize = sizeof(void*);
Carl Shapiroa5d5cfd2011-06-21 12:46:59 -070036
Mathieu Chartier50482232013-11-21 11:48:14 -080037static constexpr size_t kBitsPerByte = 8;
38static constexpr size_t kBitsPerByteLog2 = 3;
39static constexpr int kBitsPerWord = kWordSize * kBitsPerByte;
Ian Rogersef7d42f2014-01-06 12:55:46 -080040static constexpr size_t kWordHighBitMask = static_cast<size_t>(1) << (kBitsPerWord - 1);
Carl Shapiroa5d5cfd2011-06-21 12:46:59 -070041
Ian Rogers0d666d82011-08-14 16:03:46 -070042// Required stack alignment
Mathieu Chartier50482232013-11-21 11:48:14 -080043static constexpr size_t kStackAlignment = 16;
Brian Carlstrom0024d6c2011-08-09 08:26:12 -070044
Ian Rogers408f79a2011-08-23 18:22:33 -070045// Required object alignment
Mathieu Chartier50482232013-11-21 11:48:14 -080046static constexpr size_t kObjectAlignment = 8;
Ian Rogers408f79a2011-08-23 18:22:33 -070047
Logan Chien468a7b12012-05-25 20:56:35 +080048// ARM instruction alignment. ARM processors require code to be 4-byte aligned,
49// but ARM ELF requires 8..
Mathieu Chartier50482232013-11-21 11:48:14 -080050static constexpr size_t kArmAlignment = 8;
Brian Carlstrome24fa612011-09-29 00:53:55 -070051
Elliott Hughes742e25e2012-04-24 18:11:08 -070052// MIPS instruction alignment. MIPS processors require code to be 4-byte aligned.
jeffhao7fbee072012-08-24 17:56:54 -070053// TODO: Can this be 4?
Mathieu Chartier50482232013-11-21 11:48:14 -080054static constexpr size_t kMipsAlignment = 8;
Elliott Hughes742e25e2012-04-24 18:11:08 -070055
Elliott Hughes942df412012-03-26 09:46:56 -070056// X86 instruction alignment. This is the recommended alignment for maximum performance.
Mathieu Chartier50482232013-11-21 11:48:14 -080057static constexpr size_t kX86Alignment = 16;
Ian Rogersb41b33b2012-03-20 14:22:54 -070058
Elliott Hughes942df412012-03-26 09:46:56 -070059// System page size. We check this against sysconf(_SC_PAGE_SIZE) at runtime, but use a simple
60// compile-time constant so the compiler can generate better code.
Mathieu Chartier50482232013-11-21 11:48:14 -080061static constexpr int kPageSize = 4096;
Brian Carlstromb0460ea2011-07-29 10:08:05 -070062
Elliott Hughes67d92002012-03-26 15:08:51 -070063// Whether or not this is a debug build. Useful in conditionals where NDEBUG isn't.
64#if defined(NDEBUG)
Mathieu Chartier50482232013-11-21 11:48:14 -080065static constexpr bool kIsDebugBuild = false;
Elliott Hughes67d92002012-03-26 15:08:51 -070066#else
Mathieu Chartier50482232013-11-21 11:48:14 -080067static constexpr bool kIsDebugBuild = true;
Elliott Hughes67d92002012-03-26 15:08:51 -070068#endif
69
Brian Carlstrombcc29262012-11-02 11:36:03 -070070// Whether or not this is a target (vs host) build. Useful in conditionals where ART_TARGET isn't.
71#if defined(ART_TARGET)
Mathieu Chartier50482232013-11-21 11:48:14 -080072static constexpr bool kIsTargetBuild = true;
Brian Carlstrombcc29262012-11-02 11:36:03 -070073#else
Mathieu Chartier50482232013-11-21 11:48:14 -080074static constexpr bool kIsTargetBuild = false;
Brian Carlstrombcc29262012-11-02 11:36:03 -070075#endif
76
Mathieu Chartier46bc7782013-11-12 17:03:02 -080077#if defined(ART_USE_PORTABLE_COMPILER)
Mathieu Chartier50482232013-11-21 11:48:14 -080078static constexpr bool kUsePortableCompiler = true;
Mathieu Chartier46bc7782013-11-12 17:03:02 -080079#else
Mathieu Chartier50482232013-11-21 11:48:14 -080080static constexpr bool kUsePortableCompiler = false;
Mathieu Chartier46bc7782013-11-12 17:03:02 -080081#endif
82
Mathieu Chartier590fee92013-09-13 13:46:47 -070083// Garbage collector constants.
Mathieu Chartier50482232013-11-21 11:48:14 -080084static constexpr bool kMovingCollector = true && !kUsePortableCompiler;
Mathieu Chartier590fee92013-09-13 13:46:47 -070085// True if we allow moving classes.
Mathieu Chartierc528dba2013-11-26 12:00:11 -080086static constexpr bool kMovingClasses = true;
Mathieu Chartier590fee92013-09-13 13:46:47 -070087// True if we allow moving fields.
88static constexpr bool kMovingFields = false;
89// True if we allow moving methods.
90static constexpr bool kMovingMethods = false;
91
Hiroshi Yamauchibe1ca552014-01-15 11:46:48 -080092// If true, the quick compiler embeds class pointers in the compiled
93// code, if possible.
94static constexpr bool kEmbedClassInCode = true;
95
Hiroshi Yamauchi9d04a202014-01-31 13:35:49 -080096#ifdef USE_BROOKS_POINTER
97static constexpr bool kUseBrooksPointer = true;
98#else
99static constexpr bool kUseBrooksPointer = false;
100#endif
101
Carl Shapiro6b6b5f02011-06-21 15:05:09 -0700102} // namespace art
Carl Shapiroa5d5cfd2011-06-21 12:46:59 -0700103
Brian Carlstromfc0e3212013-07-17 14:40:12 -0700104#endif // ART_RUNTIME_GLOBALS_H_