1// Copyright 2014 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_BASE_BUILD_CONFIG_H_
6#define V8_BASE_BUILD_CONFIG_H_
7
8#include "include/v8config.h"
9
10// Processor architecture detection.  For more info on what's defined, see:
11//   http://msdn.microsoft.com/en-us/library/b0084kay.aspx
12//   http://www.agner.org/optimize/calling_conventions.pdf
13//   or with gcc, run: "echo | gcc -E -dM -"
14#if defined(_M_X64) || defined(__x86_64__)
15#if defined(__native_client__)
16// For Native Client builds of V8, use V8_TARGET_ARCH_ARM, so that V8
17// generates ARM machine code, together with a portable ARM simulator
18// compiled for the host architecture in question.
19//
20// Since Native Client is ILP-32 on all architectures we use
21// V8_HOST_ARCH_IA32 on both 32- and 64-bit x86.
22#define V8_HOST_ARCH_IA32 1
23#define V8_HOST_ARCH_32_BIT 1
24#else
25#define V8_HOST_ARCH_X64 1
26#if defined(__x86_64__) && __SIZEOF_POINTER__ == 4  // Check for x32.
27#define V8_HOST_ARCH_32_BIT 1
28#else
29#define V8_HOST_ARCH_64_BIT 1
30#endif
31#endif  // __native_client__
32#elif defined(_M_IX86) || defined(__i386__)
33#define V8_HOST_ARCH_IA32 1
34#define V8_HOST_ARCH_32_BIT 1
35#elif defined(__AARCH64EL__)
36#define V8_HOST_ARCH_ARM64 1
37#define V8_HOST_ARCH_64_BIT 1
38#elif defined(__ARMEL__)
39#define V8_HOST_ARCH_ARM 1
40#define V8_HOST_ARCH_32_BIT 1
41#elif defined(__mips64)
42#define V8_HOST_ARCH_MIPS64 1
43#define V8_HOST_ARCH_64_BIT 1
44#elif defined(__MIPSEB__) || defined(__MIPSEL__)
45#define V8_HOST_ARCH_MIPS 1
46#define V8_HOST_ARCH_32_BIT 1
47#else
48#error "Host architecture was not detected as supported by v8"
49#endif
50
51#if defined(__ARM_ARCH_7A__) || \
52    defined(__ARM_ARCH_7R__) || \
53    defined(__ARM_ARCH_7__)
54# define CAN_USE_ARMV7_INSTRUCTIONS 1
55# ifndef CAN_USE_VFP3_INSTRUCTIONS
56#  define CAN_USE_VFP3_INSTRUCTIONS
57# endif
58#endif
59
60
61// Target architecture detection. This may be set externally. If not, detect
62// in the same way as the host architecture, that is, target the native
63// environment as presented by the compiler.
64#if !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32 && !V8_TARGET_ARCH_X87 && \
65    !V8_TARGET_ARCH_ARM && !V8_TARGET_ARCH_ARM64 && !V8_TARGET_ARCH_MIPS && \
66    !V8_TARGET_ARCH_MIPS64
67#if defined(_M_X64) || defined(__x86_64__)
68#define V8_TARGET_ARCH_X64 1
69#elif defined(_M_IX86) || defined(__i386__)
70#define V8_TARGET_ARCH_IA32 1
71#elif defined(__AARCH64EL__)
72#define V8_TARGET_ARCH_ARM64 1
73#elif defined(__ARMEL__)
74#define V8_TARGET_ARCH_ARM 1
75#elif defined(__mips64)
76#define V8_TARGET_ARCH_MIPS64 1
77#elif defined(__MIPSEB__) || defined(__MIPSEL__)
78#define V8_TARGET_ARCH_MIPS 1
79#else
80#error Target architecture was not detected as supported by v8
81#endif
82#endif
83
84// Determine architecture pointer size.
85#if V8_TARGET_ARCH_IA32
86#define V8_TARGET_ARCH_32_BIT 1
87#elif V8_TARGET_ARCH_X64
88#if !V8_TARGET_ARCH_32_BIT && !V8_TARGET_ARCH_64_BIT
89#if defined(__x86_64__) && __SIZEOF_POINTER__ == 4  // Check for x32.
90#define V8_TARGET_ARCH_32_BIT 1
91#else
92#define V8_TARGET_ARCH_64_BIT 1
93#endif
94#endif
95#elif V8_TARGET_ARCH_ARM
96#define V8_TARGET_ARCH_32_BIT 1
97#elif V8_TARGET_ARCH_ARM64
98#define V8_TARGET_ARCH_64_BIT 1
99#elif V8_TARGET_ARCH_MIPS
100#define V8_TARGET_ARCH_32_BIT 1
101#elif V8_TARGET_ARCH_MIPS64
102#define V8_TARGET_ARCH_64_BIT 1
103#elif V8_TARGET_ARCH_X87
104#define V8_TARGET_ARCH_32_BIT 1
105#else
106#error Unknown target architecture pointer size
107#endif
108
109// Check for supported combinations of host and target architectures.
110#if V8_TARGET_ARCH_IA32 && !V8_HOST_ARCH_IA32
111#error Target architecture ia32 is only supported on ia32 host
112#endif
113#if (V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_64_BIT && \
114     !(V8_HOST_ARCH_X64 && V8_HOST_ARCH_64_BIT))
115#error Target architecture x64 is only supported on x64 host
116#endif
117#if (V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_32_BIT && \
118     !(V8_HOST_ARCH_X64 && V8_HOST_ARCH_32_BIT))
119#error Target architecture x32 is only supported on x64 host with x32 support
120#endif
121#if (V8_TARGET_ARCH_ARM && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_ARM))
122#error Target architecture arm is only supported on arm and ia32 host
123#endif
124#if (V8_TARGET_ARCH_ARM64 && !(V8_HOST_ARCH_X64 || V8_HOST_ARCH_ARM64))
125#error Target architecture arm64 is only supported on arm64 and x64 host
126#endif
127#if (V8_TARGET_ARCH_MIPS && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_MIPS))
128#error Target architecture mips is only supported on mips and ia32 host
129#endif
130#if (V8_TARGET_ARCH_MIPS64 && !(V8_HOST_ARCH_X64 || V8_HOST_ARCH_MIPS64))
131#error Target architecture mips64 is only supported on mips64 and x64 host
132#endif
133
134// Determine architecture endianness.
135#if V8_TARGET_ARCH_IA32
136#define V8_TARGET_LITTLE_ENDIAN 1
137#elif V8_TARGET_ARCH_X64
138#define V8_TARGET_LITTLE_ENDIAN 1
139#elif V8_TARGET_ARCH_ARM
140#define V8_TARGET_LITTLE_ENDIAN 1
141#elif V8_TARGET_ARCH_ARM64
142#define V8_TARGET_LITTLE_ENDIAN 1
143#elif V8_TARGET_ARCH_MIPS
144#if defined(__MIPSEB__)
145#define V8_TARGET_BIG_ENDIAN 1
146#else
147#define V8_TARGET_LITTLE_ENDIAN 1
148#endif
149#elif V8_TARGET_ARCH_MIPS64
150#define V8_TARGET_LITTLE_ENDIAN 1
151#elif V8_TARGET_ARCH_X87
152#define V8_TARGET_LITTLE_ENDIAN 1
153#else
154#error Unknown target architecture endianness
155#endif
156
157// Number of bits to represent the page size for paged spaces. The value of 20
158// gives 1Mb bytes per page.
159const int kPageSizeBits = 20;
160
161#endif  // V8_BASE_BUILD_CONFIG_H_
162