1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #include "../include/v8stdint.h"
33 // Unfortunately, the INFINITY macro cannot be used with the '-pedantic'
34 // warning flag and certain versions of GCC due to a bug:
35 // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11931
36 // For now, we use the more involved template-based version from <limits>, but
37 // only when compiling with GCC versions affected by the bug (2.96.x - 4.0.x)
38 #if V8_CC_GNU && V8_GNUC_PREREQ(2, 96, 0) && !V8_GNUC_PREREQ(4, 1, 0)
39 # include <limits> // NOLINT
40 # define V8_INFINITY std::numeric_limits<double>::infinity()
42 # define V8_INFINITY HUGE_VAL
44 # define V8_INFINITY INFINITY
50 // Processor architecture detection. For more info on what's defined, see:
51 // http://msdn.microsoft.com/en-us/library/b0084kay.aspx
52 // http://www.agner.org/optimize/calling_conventions.pdf
53 // or with gcc, run: "echo | gcc -E -dM -"
54 #if defined(_M_X64) || defined(__x86_64__)
55 #if defined(__native_client__)
56 // For Native Client builds of V8, use V8_TARGET_ARCH_ARM, so that V8
57 // generates ARM machine code, together with a portable ARM simulator
58 // compiled for the host architecture in question.
60 // Since Native Client is ILP-32 on all architectures we use
61 // V8_HOST_ARCH_IA32 on both 32- and 64-bit x86.
62 #define V8_HOST_ARCH_IA32 1
63 #define V8_HOST_ARCH_32_BIT 1
64 #define V8_HOST_CAN_READ_UNALIGNED 1
66 #define V8_HOST_ARCH_X64 1
67 #define V8_HOST_ARCH_64_BIT 1
68 #define V8_HOST_CAN_READ_UNALIGNED 1
69 #endif // __native_client__
70 #elif defined(_M_IX86) || defined(__i386__)
71 #define V8_HOST_ARCH_IA32 1
72 #define V8_HOST_ARCH_32_BIT 1
73 #define V8_HOST_CAN_READ_UNALIGNED 1
74 #elif defined(__ARMEL__)
75 #define V8_HOST_ARCH_ARM 1
76 #define V8_HOST_ARCH_32_BIT 1
77 #elif defined(__MIPSEL__)
78 #define V8_HOST_ARCH_MIPS 1
79 #define V8_HOST_ARCH_32_BIT 1
81 #error Host architecture was not detected as supported by v8
84 #if defined(__ARM_ARCH_7A__) || \
85 defined(__ARM_ARCH_7R__) || \
86 defined(__ARM_ARCH_7__)
87 # define CAN_USE_ARMV7_INSTRUCTIONS 1
88 # ifndef CAN_USE_VFP3_INSTRUCTIONS
89 # define CAN_USE_VFP3_INSTRUCTIONS
94 // Target architecture detection. This may be set externally. If not, detect
95 // in the same way as the host architecture, that is, target the native
96 // environment as presented by the compiler.
97 #if !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32 && \
98 !V8_TARGET_ARCH_ARM && !V8_TARGET_ARCH_MIPS
99 #if defined(_M_X64) || defined(__x86_64__)
100 #define V8_TARGET_ARCH_X64 1
101 #elif defined(_M_IX86) || defined(__i386__)
102 #define V8_TARGET_ARCH_IA32 1
103 #elif defined(__ARMEL__)
104 #define V8_TARGET_ARCH_ARM 1
105 #elif defined(__MIPSEL__)
106 #define V8_TARGET_ARCH_MIPS 1
108 #error Target architecture was not detected as supported by v8
112 // Check for supported combinations of host and target architectures.
113 #if V8_TARGET_ARCH_IA32 && !V8_HOST_ARCH_IA32
114 #error Target architecture ia32 is only supported on ia32 host
116 #if V8_TARGET_ARCH_X64 && !V8_HOST_ARCH_X64
117 #error Target architecture x64 is only supported on x64 host
119 #if (V8_TARGET_ARCH_ARM && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_ARM))
120 #error Target architecture arm is only supported on arm and ia32 host
122 #if (V8_TARGET_ARCH_MIPS && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_MIPS))
123 #error Target architecture mips is only supported on mips and ia32 host
126 // Determine whether we are running in a simulated environment.
127 // Setting USE_SIMULATOR explicitly from the build script will force
128 // the use of a simulated environment.
129 #if !defined(USE_SIMULATOR)
130 #if (V8_TARGET_ARCH_ARM && !V8_HOST_ARCH_ARM)
131 #define USE_SIMULATOR 1
133 #if (V8_TARGET_ARCH_MIPS && !V8_HOST_ARCH_MIPS)
134 #define USE_SIMULATOR 1
138 // Determine architecture endiannes (we only support little-endian).
139 #if V8_TARGET_ARCH_IA32
140 #define V8_TARGET_LITTLE_ENDIAN 1
141 #elif V8_TARGET_ARCH_X64
142 #define V8_TARGET_LITTLE_ENDIAN 1
143 #elif V8_TARGET_ARCH_ARM
144 #define V8_TARGET_LITTLE_ENDIAN 1
145 #elif V8_TARGET_ARCH_MIPS
146 #define V8_TARGET_LITTLE_ENDIAN 1
148 #error Unknown target architecture endiannes
151 // Support for alternative bool type. This is only enabled if the code is
152 // compiled with USE_MYBOOL defined. This catches some nasty type bugs.
153 // For instance, 'bool b = "false";' results in b == true! This is a hidden
155 // However, redefining the bool type does have some negative impact on some
156 // platforms. It gives rise to compiler warnings (i.e. with
157 // MSVC) in the API header files when mixing code that uses the standard
158 // bool with code that uses the redefined version.
159 // This does not actually belong in the platform code, but needs to be
160 // defined here because the platform code uses bool, and platform.h is
161 // include very early in the main include file.
164 typedef unsigned int __my_bool__;
165 #define bool __my_bool__ // use 'indirection' to avoid name clashes
168 typedef uint8_t byte;
169 typedef byte* Address;
171 // Define our own macros for writing 64-bit constants. This is less fragile
172 // than defining __STDC_CONSTANT_MACROS before including <stdint.h>, and it
173 // works on compilers that don't have it (like MSVC).
175 # define V8_UINT64_C(x) (x ## UI64)
176 # define V8_INT64_C(x) (x ## I64)
177 # if V8_HOST_ARCH_64_BIT
178 # define V8_INTPTR_C(x) (x ## I64)
179 # define V8_PTR_PREFIX "ll"
181 # define V8_INTPTR_C(x) (x)
182 # define V8_PTR_PREFIX ""
183 # endif // V8_HOST_ARCH_64_BIT
185 # define V8_UINT64_C(x) (x ## ULL)
186 # define V8_INT64_C(x) (x ## LL)
187 # define V8_INTPTR_C(x) (x ## LL)
188 # define V8_PTR_PREFIX "I64"
189 #elif V8_HOST_ARCH_64_BIT
191 # define V8_UINT64_C(x) (x ## ULL)
192 # define V8_INT64_C(x) (x ## LL)
194 # define V8_UINT64_C(x) (x ## UL)
195 # define V8_INT64_C(x) (x ## L)
197 # define V8_INTPTR_C(x) (x ## L)
198 # define V8_PTR_PREFIX "l"
200 # define V8_UINT64_C(x) (x ## ULL)
201 # define V8_INT64_C(x) (x ## LL)
202 # define V8_INTPTR_C(x) (x)
203 # define V8_PTR_PREFIX ""
206 // The following macro works on both 32 and 64-bit platforms.
207 // Usage: instead of writing 0x1234567890123456
208 // write V8_2PART_UINT64_C(0x12345678,90123456);
209 #define V8_2PART_UINT64_C(a, b) (((static_cast<uint64_t>(a) << 32) + 0x##b##u))
211 #define V8PRIxPTR V8_PTR_PREFIX "x"
212 #define V8PRIdPTR V8_PTR_PREFIX "d"
213 #define V8PRIuPTR V8_PTR_PREFIX "u"
215 // Fix for Mac OS X defining uintptr_t as "unsigned long":
218 #define V8PRIxPTR "lx"
221 #if V8_OS_MACOSX || defined(__FreeBSD__) || defined(__OpenBSD__)
222 #define USING_BSD_ABI
225 // -----------------------------------------------------------------------------
228 struct float32x4_value_t { float storage[4]; };
229 struct int32x4_value_t { int32_t storage[4]; };
230 union simd128_value_t {
232 float32x4_value_t f4;
237 const int MB = KB * KB;
238 const int GB = KB * KB * KB;
239 const int kMaxInt = 0x7FFFFFFF;
240 const int kMinInt = -kMaxInt - 1;
241 const int kMaxInt8 = (1 << 7) - 1;
242 const int kMinInt8 = -(1 << 7);
243 const int kMaxUInt8 = (1 << 8) - 1;
244 const int kMinUInt8 = 0;
245 const int kMaxInt16 = (1 << 15) - 1;
246 const int kMinInt16 = -(1 << 15);
247 const int kMaxUInt16 = (1 << 16) - 1;
248 const int kMinUInt16 = 0;
250 const uint32_t kMaxUInt32 = 0xFFFFFFFFu;
252 const int kCharSize = sizeof(char); // NOLINT
253 const int kShortSize = sizeof(short); // NOLINT
254 const int kIntSize = sizeof(int); // NOLINT
255 const int kInt32Size = sizeof(int32_t); // NOLINT
256 const int kInt64Size = sizeof(int64_t); // NOLINT
257 const int kDoubleSize = sizeof(double); // NOLINT
258 const int kFloatSize = sizeof(float); // NOLINT
259 const int kFloat32x4Size = sizeof(float32x4_value_t); // NOLINT
260 const int kInt32x4Size = sizeof(int32x4_value_t); // NOLINT
261 const int kSIMD128Size = sizeof(simd128_value_t); // NOLINT
262 const int kIntptrSize = sizeof(intptr_t); // NOLINT
263 const int kPointerSize = sizeof(void*); // NOLINT
264 const int kRegisterSize = kPointerSize;
265 const int kPCOnStackSize = kRegisterSize;
266 const int kFPOnStackSize = kRegisterSize;
268 const int kDoubleSizeLog2 = 3;
270 #if V8_HOST_ARCH_64_BIT
271 const int kPointerSizeLog2 = 3;
272 const intptr_t kIntptrSignBit = V8_INT64_C(0x8000000000000000);
273 const uintptr_t kUintptrAllBitsSet = V8_UINT64_C(0xFFFFFFFFFFFFFFFF);
274 const bool kIs64BitArch = true;
276 const int kPointerSizeLog2 = 2;
277 const intptr_t kIntptrSignBit = 0x80000000;
278 const uintptr_t kUintptrAllBitsSet = 0xFFFFFFFFu;
279 const bool kIs64BitArch = false;
282 const int kBitsPerByte = 8;
283 const int kBitsPerByteLog2 = 3;
284 const int kBitsPerPointer = kPointerSize * kBitsPerByte;
285 const int kBitsPerInt = kIntSize * kBitsPerByte;
287 // IEEE 754 single precision floating point number bit layout.
288 const uint32_t kBinary32SignMask = 0x80000000u;
289 const uint32_t kBinary32ExponentMask = 0x7f800000u;
290 const uint32_t kBinary32MantissaMask = 0x007fffffu;
291 const int kBinary32ExponentBias = 127;
292 const int kBinary32MaxExponent = 0xFE;
293 const int kBinary32MinExponent = 0x01;
294 const int kBinary32MantissaBits = 23;
295 const int kBinary32ExponentShift = 23;
297 // Quiet NaNs have bits 51 to 62 set, possibly the sign bit, and no
299 const uint64_t kQuietNaNMask = static_cast<uint64_t>(0xfff) << 51;
301 // Latin1/UTF-16 constants
302 // Code-point values in Unicode 4.0 are 21 bits wide.
303 // Code units in UTF-16 are 16 bits wide.
304 typedef uint16_t uc16;
305 typedef int32_t uc32;
306 const int kOneByteSize = kCharSize;
307 const int kUC16Size = sizeof(uc16); // NOLINT
310 // Round up n to be a multiple of sz, where sz is a power of 2.
311 #define ROUND_UP(n, sz) (((n) + ((sz) - 1)) & ~((sz) - 1))
314 // The expression OFFSET_OF(type, field) computes the byte-offset
315 // of the specified field relative to the containing type. This
316 // corresponds to 'offsetof' (in stddef.h), except that it doesn't
317 // use 0 or NULL, which causes a problem with the compiler warnings
318 // we have enabled (which is also why 'offsetof' doesn't seem to work).
319 // Here we simply use the non-zero value 4, which seems to work.
320 #define OFFSET_OF(type, field) \
321 (reinterpret_cast<intptr_t>(&(reinterpret_cast<type*>(4)->field)) - 4)
324 // The expression ARRAY_SIZE(a) is a compile-time constant of type
325 // size_t which represents the number of elements of the given
326 // array. You should only use ARRAY_SIZE on statically allocated
328 #define ARRAY_SIZE(a) \
329 ((sizeof(a) / sizeof(*(a))) / \
330 static_cast<size_t>(!(sizeof(a) % sizeof(*(a)))))
333 // The USE(x) template is used to silence C++ compiler warnings
334 // issued for (yet) unused variables (typically parameters).
335 template <typename T>
336 inline void USE(T) { }
339 // FUNCTION_ADDR(f) gets the address of a C function f.
340 #define FUNCTION_ADDR(f) \
341 (reinterpret_cast<v8::internal::Address>(reinterpret_cast<intptr_t>(f)))
344 // FUNCTION_CAST<F>(addr) casts an address into a function
345 // of type F. Used to invoke generated code from within C.
346 template <typename F>
347 F FUNCTION_CAST(Address addr) {
348 return reinterpret_cast<F>(reinterpret_cast<intptr_t>(addr));
352 // A macro to disallow the evil copy constructor and operator= functions
353 // This should be used in the private: declarations for a class
354 #define DISALLOW_COPY_AND_ASSIGN(TypeName) \
355 TypeName(const TypeName&) V8_DELETE; \
356 void operator=(const TypeName&) V8_DELETE
359 // A macro to disallow all the implicit constructors, namely the
360 // default constructor, copy constructor and operator= functions.
362 // This should be used in the private: declarations for a class
363 // that wants to prevent anyone from instantiating it. This is
364 // especially useful for classes containing only static methods.
365 #define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
366 TypeName() V8_DELETE; \
367 DISALLOW_COPY_AND_ASSIGN(TypeName)
370 // Newly written code should use V8_INLINE and V8_NOINLINE directly.
371 #define INLINE(declarator) V8_INLINE declarator
372 #define NO_INLINE(declarator) V8_NOINLINE declarator
375 // Newly written code should use V8_WARN_UNUSED_RESULT.
376 #define MUST_USE_RESULT V8_WARN_UNUSED_RESULT
379 // Define DISABLE_ASAN macros.
380 #if defined(__has_feature)
381 #if __has_feature(address_sanitizer)
382 #define DISABLE_ASAN __attribute__((no_sanitize_address))
392 // -----------------------------------------------------------------------------
393 // Forward declarations for frequently used classes
394 // (sorted alphabetically)
396 class FreeStoreAllocationPolicy;
397 template <typename T, class P = FreeStoreAllocationPolicy> class List;
399 // -----------------------------------------------------------------------------
400 // Declarations for use in both the preparser and the rest of V8.
402 // The different language modes that V8 implements. ES5 defines two language
403 // modes: an unrestricted mode respectively a strict mode which are indicated by
404 // CLASSIC_MODE respectively STRICT_MODE in the enum. The harmony spec drafts
405 // for the next ES standard specify a new third mode which is called 'extended
406 // mode'. The extended mode is only available if the harmony flag is set. It is
407 // based on the 'strict mode' and adds new functionality to it. This means that
408 // most of the semantics of these two modes coincide.
410 // In the current draft the term 'base code' is used to refer to code that is
411 // neither in strict nor extended mode. However, the more distinguishing term
412 // 'classic mode' is used in V8 instead to avoid mix-ups.
421 // The Strict Mode (ECMA-262 5th edition, 4.2.2).
423 // This flag is used in the backend to represent the language mode. So far
424 // there is no semantic difference between the strict and the extended mode in
425 // the backend, so both modes are represented by the kStrictMode value.
426 enum StrictModeFlag {
432 } } // namespace v8::internal
434 #endif // V8_GLOBALS_H_