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_RUNTIME_GLOBALS_H_
18#define ART_RUNTIME_GLOBALS_H_
19
20#include <stddef.h>
21#include <stdint.h>
22
23namespace art {
24
25typedef uint8_t byte;
26typedef intptr_t word;
27typedef uintptr_t uword;
28
29const size_t KB = 1024;
30const size_t MB = KB * KB;
31const size_t GB = KB * KB * KB;
32
33const int kWordSize = sizeof(word);
34const int kPointerSize = sizeof(void*);
35
36const int kBitsPerByte = 8;
37const int kBitsPerByteLog2 = 3;
38const int kBitsPerWord = kWordSize * kBitsPerByte;
39const int kWordHighBitMask = 1 << (kBitsPerWord - 1);
40
41// Required stack alignment
42const int kStackAlignment = 16;
43
44// Required object alignment
45const int kObjectAlignment = 8;
46
47// ARM instruction alignment. ARM processors require code to be 4-byte aligned,
48// but ARM ELF requires 8..
49const int kArmAlignment = 8;
50
51// MIPS instruction alignment.  MIPS processors require code to be 4-byte aligned.
52// TODO: Can this be 4?
53const int kMipsAlignment = 8;
54
55// X86 instruction alignment. This is the recommended alignment for maximum performance.
56const int kX86Alignment = 16;
57
58// System page size. We check this against sysconf(_SC_PAGE_SIZE) at runtime, but use a simple
59// compile-time constant so the compiler can generate better code.
60const int kPageSize = 4096;
61
62// Whether or not this is a debug build. Useful in conditionals where NDEBUG isn't.
63#if defined(NDEBUG)
64const bool kIsDebugBuild = false;
65#else
66const bool kIsDebugBuild = true;
67#endif
68
69// Whether or not this is a target (vs host) build. Useful in conditionals where ART_TARGET isn't.
70#if defined(ART_TARGET)
71const bool kIsTargetBuild = true;
72#else
73const bool kIsTargetBuild = false;
74#endif
75
76}  // namespace art
77
78#endif  // ART_RUNTIME_GLOBALS_H_
79