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platform.h
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1/* Copyright 2016 Google Inc. All Rights Reserved.
2
3 Distributed under MIT license.
4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
5*/
6
7/* Macros for compiler / platform specific features and build options.
8
9 Build options are:
10 * BROTLI_BUILD_32_BIT disables 64-bit optimizations
11 * BROTLI_BUILD_64_BIT forces to use 64-bit optimizations
12 * BROTLI_BUILD_BIG_ENDIAN forces to use big-endian optimizations
13 * BROTLI_BUILD_ENDIAN_NEUTRAL disables endian-aware optimizations
14 * BROTLI_BUILD_LITTLE_ENDIAN forces to use little-endian optimizations
15 * BROTLI_BUILD_PORTABLE disables dangerous optimizations, like unaligned
16 read and overlapping memcpy; this reduces decompression speed by 5%
17 * BROTLI_BUILD_NO_RBIT disables "rbit" optimization for ARM CPUs
18 * BROTLI_DEBUG dumps file name and line number when decoder detects stream
19 or memory error
20 * BROTLI_ENABLE_LOG enables asserts and dumps various state information
21*/
22
23#ifndef BROTLI_COMMON_PLATFORM_H_
24#define BROTLI_COMMON_PLATFORM_H_
25
26#include <string.h> /* memcpy */
27
28#include <brotli/port.h>
29#include <brotli/types.h>
30
31#if defined(OS_LINUX) || defined(OS_CYGWIN) || defined(__EMSCRIPTEN__)
32#include <endian.h>
33#elif defined(OS_FREEBSD)
34#include <machine/endian.h>
35#elif defined(OS_MACOSX)
36#include <machine/endian.h>
37/* Let's try and follow the Linux convention */
38#define BROTLI_X_BYTE_ORDER BYTE_ORDER
39#define BROTLI_X_LITTLE_ENDIAN LITTLE_ENDIAN
40#define BROTLI_X_BIG_ENDIAN BIG_ENDIAN
41#endif
42
43#if BROTLI_MSVC_VERSION_CHECK(12, 0, 0)
44#include <intrin.h>
45#endif
46
47#if defined(BROTLI_ENABLE_LOG) || defined(BROTLI_DEBUG)
48#include <assert.h>
49#include <stdio.h>
50#endif
51
52/* The following macros were borrowed from https://github.com/nemequ/hedley
53 * with permission of original author - Evan Nemerson <evan@nemerson.com> */
54
55/* >>> >>> >>> hedley macros */
56
57/* Define "BROTLI_PREDICT_TRUE" and "BROTLI_PREDICT_FALSE" macros for capable
58 compilers.
59
60To apply compiler hint, enclose the branching condition into macros, like this:
61
62 if (BROTLI_PREDICT_TRUE(zero == 0)) {
63 // main execution path
64 } else {
65 // compiler should place this code outside of main execution path
66 }
67
68OR:
69
70 if (BROTLI_PREDICT_FALSE(something_rare_or_unexpected_happens)) {
71 // compiler should place this code outside of main execution path
72 }
73
74*/
75#if BROTLI_GNUC_HAS_BUILTIN(__builtin_expect, 3, 0, 0) || \
76 BROTLI_INTEL_VERSION_CHECK(16, 0, 0) || \
77 BROTLI_SUNPRO_VERSION_CHECK(5, 15, 0) || \
78 BROTLI_ARM_VERSION_CHECK(4, 1, 0) || \
79 BROTLI_IBM_VERSION_CHECK(10, 1, 0) || \
80 BROTLI_TI_VERSION_CHECK(7, 3, 0) || \
81 BROTLI_TINYC_VERSION_CHECK(0, 9, 27)
82#define BROTLI_PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
83#define BROTLI_PREDICT_FALSE(x) (__builtin_expect(x, 0))
84#else
85#define BROTLI_PREDICT_FALSE(x) (x)
86#define BROTLI_PREDICT_TRUE(x) (x)
87#endif
88
89#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && \
90 !defined(__cplusplus)
91#define BROTLI_RESTRICT restrict
92#elif BROTLI_GNUC_VERSION_CHECK(3, 1, 0) || \
93 BROTLI_MSVC_VERSION_CHECK(14, 0, 0) || \
94 BROTLI_INTEL_VERSION_CHECK(16, 0, 0) || \
95 BROTLI_ARM_VERSION_CHECK(4, 1, 0) || \
96 BROTLI_IBM_VERSION_CHECK(10, 1, 0) || \
97 BROTLI_PGI_VERSION_CHECK(17, 10, 0) || \
98 BROTLI_TI_VERSION_CHECK(8, 0, 0) || \
99 BROTLI_IAR_VERSION_CHECK(8, 0, 0) || \
100 (BROTLI_SUNPRO_VERSION_CHECK(5, 14, 0) && defined(__cplusplus))
101#define BROTLI_RESTRICT __restrict
102#elif BROTLI_SUNPRO_VERSION_CHECK(5, 3, 0) && !defined(__cplusplus)
103#define BROTLI_RESTRICT _Restrict
104#else
105#define BROTLI_RESTRICT
106#endif
107
108#if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) || \
109 (defined(__cplusplus) && (__cplusplus >= 199711L))
110#define BROTLI_MAYBE_INLINE inline
111#elif defined(__GNUC_STDC_INLINE__) || defined(__GNUC_GNU_INLINE__) || \
112 BROTLI_ARM_VERSION_CHECK(6, 2, 0)
113#define BROTLI_MAYBE_INLINE __inline__
114#elif BROTLI_MSVC_VERSION_CHECK(12, 0, 0) || \
115 BROTLI_ARM_VERSION_CHECK(4, 1, 0) || BROTLI_TI_VERSION_CHECK(8, 0, 0)
116#define BROTLI_MAYBE_INLINE __inline
117#else
118#define BROTLI_MAYBE_INLINE
119#endif
120
121#if BROTLI_GNUC_HAS_ATTRIBUTE(always_inline, 4, 0, 0) || \
122 BROTLI_INTEL_VERSION_CHECK(16, 0, 0) || \
123 BROTLI_SUNPRO_VERSION_CHECK(5, 11, 0) || \
124 BROTLI_ARM_VERSION_CHECK(4, 1, 0) || \
125 BROTLI_IBM_VERSION_CHECK(10, 1, 0) || \
126 BROTLI_TI_VERSION_CHECK(8, 0, 0) || \
127 (BROTLI_TI_VERSION_CHECK(7, 3, 0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__))
128#define BROTLI_INLINE BROTLI_MAYBE_INLINE __attribute__((__always_inline__))
129#elif BROTLI_MSVC_VERSION_CHECK(12, 0, 0)
130#define BROTLI_INLINE BROTLI_MAYBE_INLINE __forceinline
131#elif BROTLI_TI_VERSION_CHECK(7, 0, 0) && defined(__cplusplus)
132#define BROTLI_INLINE BROTLI_MAYBE_INLINE _Pragma("FUNC_ALWAYS_INLINE;")
133#elif BROTLI_IAR_VERSION_CHECK(8, 0, 0)
134#define BROTLI_INLINE BROTLI_MAYBE_INLINE _Pragma("inline=forced")
135#else
136#define BROTLI_INLINE BROTLI_MAYBE_INLINE
137#endif
138
139#if BROTLI_GNUC_HAS_ATTRIBUTE(noinline, 4, 0, 0) || \
140 BROTLI_INTEL_VERSION_CHECK(16, 0, 0) || \
141 BROTLI_SUNPRO_VERSION_CHECK(5, 11, 0) || \
142 BROTLI_ARM_VERSION_CHECK(4, 1, 0) || \
143 BROTLI_IBM_VERSION_CHECK(10, 1, 0) || \
144 BROTLI_TI_VERSION_CHECK(8, 0, 0) || \
145 (BROTLI_TI_VERSION_CHECK(7, 3, 0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__))
146#define BROTLI_NOINLINE __attribute__((__noinline__))
147#elif BROTLI_MSVC_VERSION_CHECK(13, 10, 0)
148#define BROTLI_NOINLINE __declspec(noinline)
149#elif BROTLI_PGI_VERSION_CHECK(10, 2, 0)
150#define BROTLI_NOINLINE _Pragma("noinline")
151#elif BROTLI_TI_VERSION_CHECK(6, 0, 0) && defined(__cplusplus)
152#define BROTLI_NOINLINE _Pragma("FUNC_CANNOT_INLINE;")
153#elif BROTLI_IAR_VERSION_CHECK(8, 0, 0)
154#define BROTLI_NOINLINE _Pragma("inline=never")
155#else
156#define BROTLI_NOINLINE
157#endif
158
159/* BROTLI_INTERNAL could be defined to override visibility, e.g. for tests. */
160#if !defined(BROTLI_INTERNAL)
161#if defined(_WIN32) || defined(__CYGWIN__)
162#define BROTLI_INTERNAL
163#elif BROTLI_GNUC_VERSION_CHECK(3, 3, 0) || \
164 BROTLI_TI_VERSION_CHECK(8, 0, 0) || \
165 BROTLI_INTEL_VERSION_CHECK(16, 0, 0) || \
166 BROTLI_ARM_VERSION_CHECK(4, 1, 0) || \
167 BROTLI_IBM_VERSION_CHECK(13, 1, 0) || \
168 BROTLI_SUNPRO_VERSION_CHECK(5, 11, 0) || \
169 (BROTLI_TI_VERSION_CHECK(7, 3, 0) && \
170 defined(__TI_GNU_ATTRIBUTE_SUPPORT__) && defined(__TI_EABI__))
171#define BROTLI_INTERNAL __attribute__ ((visibility ("hidden")))
172#else
173#define BROTLI_INTERNAL
174#endif
175#endif
176
177/* <<< <<< <<< end of hedley macros. */
178
179#if BROTLI_GNUC_HAS_ATTRIBUTE(unused, 2, 7, 0) || \
180 BROTLI_INTEL_VERSION_CHECK(16, 0, 0)
181#define BROTLI_UNUSED_FUNCTION static BROTLI_INLINE __attribute__ ((unused))
182#else
183#define BROTLI_UNUSED_FUNCTION static BROTLI_INLINE
184#endif
185
186#if BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0)
187#define BROTLI_ALIGNED(N) __attribute__((aligned(N)))
188#else
189#define BROTLI_ALIGNED(N)
190#endif
191
192#if (defined(__ARM_ARCH) && (__ARM_ARCH == 7)) || \
193 (defined(M_ARM) && (M_ARM == 7))
194#define BROTLI_TARGET_ARMV7
195#endif /* ARMv7 */
196
197#if (defined(__ARM_ARCH) && (__ARM_ARCH == 8)) || \
198 defined(__aarch64__) || defined(__ARM64_ARCH_8__)
199#define BROTLI_TARGET_ARMV8_ANY
200
201#if defined(__ARM_32BIT_STATE)
202#define BROTLI_TARGET_ARMV8_32
203#elif defined(__ARM_64BIT_STATE)
204#define BROTLI_TARGET_ARMV8_64
205#endif
206
207#endif /* ARMv8 */
208
209#if defined(__ARM_NEON__) || defined(__ARM_NEON)
210#define BROTLI_TARGET_NEON
211#endif
212
213#if defined(__i386) || defined(_M_IX86)
214#define BROTLI_TARGET_X86
215#endif
216
217#if defined(__x86_64__) || defined(_M_X64)
218#define BROTLI_TARGET_X64
219#endif
220
221#if defined(__PPC64__)
222#define BROTLI_TARGET_POWERPC64
223#endif
224
225#if defined(__riscv) && defined(__riscv_xlen) && __riscv_xlen == 64
226#define BROTLI_TARGET_RISCV64
227#endif
228
229#if defined(BROTLI_BUILD_64_BIT)
230#define BROTLI_64_BITS 1
231#elif defined(BROTLI_BUILD_32_BIT)
232#define BROTLI_64_BITS 0
233#elif defined(BROTLI_TARGET_X64) || defined(BROTLI_TARGET_ARMV8_64) || \
234 defined(BROTLI_TARGET_POWERPC64) || defined(BROTLI_TARGET_RISCV64)
235#define BROTLI_64_BITS 1
236#else
237#define BROTLI_64_BITS 0
238#endif
239
240#if (BROTLI_64_BITS)
241#define brotli_reg_t uint64_t
242#else
243#define brotli_reg_t uint32_t
244#endif
245
246#if defined(BROTLI_BUILD_BIG_ENDIAN)
247#define BROTLI_BIG_ENDIAN 1
248#elif defined(BROTLI_BUILD_LITTLE_ENDIAN)
249#define BROTLI_LITTLE_ENDIAN 1
250#elif defined(BROTLI_BUILD_ENDIAN_NEUTRAL)
251/* Just break elif chain. */
252#elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
253#define BROTLI_LITTLE_ENDIAN 1
254#elif defined(_WIN32) || defined(BROTLI_TARGET_X64)
255/* Win32 & x64 can currently always be assumed to be little endian */
256#define BROTLI_LITTLE_ENDIAN 1
257#elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
258#define BROTLI_BIG_ENDIAN 1
259#elif defined(BROTLI_X_BYTE_ORDER)
260#if BROTLI_X_BYTE_ORDER == BROTLI_X_LITTLE_ENDIAN
261#define BROTLI_LITTLE_ENDIAN 1
262#elif BROTLI_X_BYTE_ORDER == BROTLI_X_BIG_ENDIAN
263#define BROTLI_BIG_ENDIAN 1
264#endif
265#endif /* BROTLI_X_BYTE_ORDER */
266
267#if !defined(BROTLI_LITTLE_ENDIAN)
268#define BROTLI_LITTLE_ENDIAN 0
269#endif
270
271#if !defined(BROTLI_BIG_ENDIAN)
272#define BROTLI_BIG_ENDIAN 0
273#endif
274
275#if defined(BROTLI_X_BYTE_ORDER)
276#undef BROTLI_X_BYTE_ORDER
277#undef BROTLI_X_LITTLE_ENDIAN
278#undef BROTLI_X_BIG_ENDIAN
279#endif
280
281#if defined(BROTLI_BUILD_PORTABLE)
282#define BROTLI_ALIGNED_READ (!!1)
283#elif defined(BROTLI_TARGET_X86) || defined(BROTLI_TARGET_X64) || \
284 defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_ANY) || \
285 defined(BROTLI_TARGET_RISCV64)
286/* Allow unaligned read only for white-listed CPUs. */
287#define BROTLI_ALIGNED_READ (!!0)
288#else
289#define BROTLI_ALIGNED_READ (!!1)
290#endif
291
292#if BROTLI_ALIGNED_READ
293/* Portable unaligned memory access: read / write values via memcpy. */
294static BROTLI_INLINE uint16_t BrotliUnalignedRead16(const void* p) {
295 uint16_t t;
296 memcpy(&t, p, sizeof t);
297 return t;
298}
299static BROTLI_INLINE uint32_t BrotliUnalignedRead32(const void* p) {
300 uint32_t t;
301 memcpy(&t, p, sizeof t);
302 return t;
303}
304static BROTLI_INLINE uint64_t BrotliUnalignedRead64(const void* p) {
305 uint64_t t;
306 memcpy(&t, p, sizeof t);
307 return t;
308}
309static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
310 memcpy(p, &v, sizeof v);
311}
312#else /* BROTLI_ALIGNED_READ */
313/* Unaligned memory access is allowed: just cast pointer to requested type. */
314#if BROTLI_SANITIZED
315/* Consider we have an unaligned load/store of 4 bytes from address 0x...05.
316 AddressSanitizer will treat it as a 3-byte access to the range 05:07 and
317 will miss a bug if 08 is the first unaddressable byte.
318 ThreadSanitizer will also treat this as a 3-byte access to 05:07 and will
319 miss a race between this access and some other accesses to 08.
320 MemorySanitizer will correctly propagate the shadow on unaligned stores
321 and correctly report bugs on unaligned loads, but it may not properly
322 update and report the origin of the uninitialized memory.
323 For all three tools, replacing an unaligned access with a tool-specific
324 callback solves the problem. */
325#if defined(__cplusplus)
326extern "C" {
327#endif /* __cplusplus */
328 uint16_t __sanitizer_unaligned_load16(const void* p);
329 uint32_t __sanitizer_unaligned_load32(const void* p);
330 uint64_t __sanitizer_unaligned_load64(const void* p);
331 void __sanitizer_unaligned_store64(void* p, uint64_t v);
332#if defined(__cplusplus)
333} /* extern "C" */
334#endif /* __cplusplus */
335#define BrotliUnalignedRead16 __sanitizer_unaligned_load16
336#define BrotliUnalignedRead32 __sanitizer_unaligned_load32
337#define BrotliUnalignedRead64 __sanitizer_unaligned_load64
338#define BrotliUnalignedWrite64 __sanitizer_unaligned_store64
339#else /* BROTLI_SANITIZED */
340static BROTLI_INLINE uint16_t BrotliUnalignedRead16(const void* p) {
341 return *(const uint16_t*)p;
342}
343static BROTLI_INLINE uint32_t BrotliUnalignedRead32(const void* p) {
344 return *(const uint32_t*)p;
345}
346#if (BROTLI_64_BITS)
347static BROTLI_INLINE uint64_t BrotliUnalignedRead64(const void* p) {
348 return *(const uint64_t*)p;
349}
350static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
351 *(uint64_t*)p = v;
352}
353#else /* BROTLI_64_BITS */
354/* Avoid emitting LDRD / STRD, which require properly aligned address. */
355/* If __attribute__(aligned) is available, use that. Otherwise, memcpy. */
356
357#if BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0)
358typedef BROTLI_ALIGNED(1) uint64_t brotli_unaligned_uint64_t;
359
360static BROTLI_INLINE uint64_t BrotliUnalignedRead64(const void* p) {
361 return (uint64_t) ((const brotli_unaligned_uint64_t*) p)[0];
362}
363static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
364 brotli_unaligned_uint64_t* dwords = (brotli_unaligned_uint64_t*) p;
365 dwords[0] = (brotli_unaligned_uint64_t) v;
366}
367#else /* BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0) */
368static BROTLI_INLINE uint64_t BrotliUnalignedRead64(const void* p) {
369 uint64_t v;
370 memcpy(&v, p, sizeof(uint64_t));
371 return v;
372}
373
374static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
375 memcpy(p, &v, sizeof(uint64_t));
376}
377#endif /* BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0) */
378#endif /* BROTLI_64_BITS */
379#endif /* BROTLI_SANITIZED */
380#endif /* BROTLI_ALIGNED_READ */
381
382#if BROTLI_LITTLE_ENDIAN
383/* Straight endianness. Just read / write values. */
384#define BROTLI_UNALIGNED_LOAD16LE BrotliUnalignedRead16
385#define BROTLI_UNALIGNED_LOAD32LE BrotliUnalignedRead32
386#define BROTLI_UNALIGNED_LOAD64LE BrotliUnalignedRead64
387#define BROTLI_UNALIGNED_STORE64LE BrotliUnalignedWrite64
388#elif BROTLI_BIG_ENDIAN /* BROTLI_LITTLE_ENDIAN */
389/* Explain compiler to byte-swap values. */
390#define BROTLI_BSWAP16_(V) ((uint16_t)( \
391 (((V) & 0xFFU) << 8) | \
392 (((V) >> 8) & 0xFFU)))
393static BROTLI_INLINE uint16_t BROTLI_UNALIGNED_LOAD16LE(const void* p) {
394 uint16_t value = BrotliUnalignedRead16(p);
395 return BROTLI_BSWAP16_(value);
396}
397#define BROTLI_BSWAP32_(V) ( \
398 (((V) & 0xFFU) << 24) | (((V) & 0xFF00U) << 8) | \
399 (((V) >> 8) & 0xFF00U) | (((V) >> 24) & 0xFFU))
400static BROTLI_INLINE uint32_t BROTLI_UNALIGNED_LOAD32LE(const void* p) {
401 uint32_t value = BrotliUnalignedRead32(p);
402 return BROTLI_BSWAP32_(value);
403}
404#define BROTLI_BSWAP64_(V) ( \
405 (((V) & 0xFFU) << 56) | (((V) & 0xFF00U) << 40) | \
406 (((V) & 0xFF0000U) << 24) | (((V) & 0xFF000000U) << 8) | \
407 (((V) >> 8) & 0xFF000000U) | (((V) >> 24) & 0xFF0000U) | \
408 (((V) >> 40) & 0xFF00U) | (((V) >> 56) & 0xFFU))
409static BROTLI_INLINE uint64_t BROTLI_UNALIGNED_LOAD64LE(const void* p) {
410 uint64_t value = BrotliUnalignedRead64(p);
411 return BROTLI_BSWAP64_(value);
412}
413static BROTLI_INLINE void BROTLI_UNALIGNED_STORE64LE(void* p, uint64_t v) {
414 uint64_t value = BROTLI_BSWAP64_(v);
415 BrotliUnalignedWrite64(p, value);
416}
417#else /* BROTLI_LITTLE_ENDIAN */
418/* Read / store values byte-wise; hopefully compiler will understand. */
419static BROTLI_INLINE uint16_t BROTLI_UNALIGNED_LOAD16LE(const void* p) {
420 const uint8_t* in = (const uint8_t*)p;
421 return (uint16_t)(in[0] | (in[1] << 8));
422}
423static BROTLI_INLINE uint32_t BROTLI_UNALIGNED_LOAD32LE(const void* p) {
424 const uint8_t* in = (const uint8_t*)p;
425 uint32_t value = (uint32_t)(in[0]);
426 value |= (uint32_t)(in[1]) << 8;
427 value |= (uint32_t)(in[2]) << 16;
428 value |= (uint32_t)(in[3]) << 24;
429 return value;
430}
431static BROTLI_INLINE uint64_t BROTLI_UNALIGNED_LOAD64LE(const void* p) {
432 const uint8_t* in = (const uint8_t*)p;
433 uint64_t value = (uint64_t)(in[0]);
434 value |= (uint64_t)(in[1]) << 8;
435 value |= (uint64_t)(in[2]) << 16;
436 value |= (uint64_t)(in[3]) << 24;
437 value |= (uint64_t)(in[4]) << 32;
438 value |= (uint64_t)(in[5]) << 40;
439 value |= (uint64_t)(in[6]) << 48;
440 value |= (uint64_t)(in[7]) << 56;
441 return value;
442}
443static BROTLI_INLINE void BROTLI_UNALIGNED_STORE64LE(void* p, uint64_t v) {
444 uint8_t* out = (uint8_t*)p;
445 out[0] = (uint8_t)v;
446 out[1] = (uint8_t)(v >> 8);
447 out[2] = (uint8_t)(v >> 16);
448 out[3] = (uint8_t)(v >> 24);
449 out[4] = (uint8_t)(v >> 32);
450 out[5] = (uint8_t)(v >> 40);
451 out[6] = (uint8_t)(v >> 48);
452 out[7] = (uint8_t)(v >> 56);
453}
454#endif /* BROTLI_LITTLE_ENDIAN */
455
456/* BROTLI_IS_CONSTANT macros returns true for compile-time constants. */
457#if BROTLI_GNUC_HAS_BUILTIN(__builtin_constant_p, 3, 0, 1) || \
458 BROTLI_INTEL_VERSION_CHECK(16, 0, 0)
459#define BROTLI_IS_CONSTANT(x) (!!__builtin_constant_p(x))
460#else
461#define BROTLI_IS_CONSTANT(x) (!!0)
462#endif
463
464#if defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_ANY)
465#define BROTLI_HAS_UBFX (!!1)
466#else
467#define BROTLI_HAS_UBFX (!!0)
468#endif
469
470#if defined(BROTLI_ENABLE_LOG)
471#define BROTLI_LOG(x) printf x
472#else
473#define BROTLI_LOG(x)
474#endif
475
476#if defined(BROTLI_DEBUG) || defined(BROTLI_ENABLE_LOG)
477#define BROTLI_DCHECK(x) assert(x)
478static BROTLI_INLINE void BrotliDump(const char* f, int l, const char* fn) {
479 fprintf(stderr, "%s:%d (%s)\n", f, l, fn);
480 fflush(stderr);
481}
482#define BROTLI_DUMP() BrotliDump(__FILE__, __LINE__, __FUNCTION__)
483#else
484#define BROTLI_DCHECK(x)
485#define BROTLI_DUMP() (void)(0)
486#endif
487
488/* TODO: add appropriate icc/sunpro/arm/ibm/ti checks. */
489#if (BROTLI_GNUC_VERSION_CHECK(3, 0, 0) || defined(__llvm__)) && \
490 !defined(BROTLI_BUILD_NO_RBIT)
491#if defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_ANY)
492/* TODO: detect ARMv6T2 and enable this code for it. */
493static BROTLI_INLINE brotli_reg_t BrotliRBit(brotli_reg_t input) {
494 brotli_reg_t output;
495 __asm__("rbit %0, %1\n" : "=r"(output) : "r"(input));
496 return output;
497}
498#define BROTLI_RBIT(x) BrotliRBit(x)
499#endif /* armv7 / armv8 */
500#endif /* gcc || clang */
501#if !defined(BROTLI_RBIT)
502static BROTLI_INLINE void BrotliRBit(void) { /* Should break build if used. */ }
503#endif /* BROTLI_RBIT */
504
505#define BROTLI_REPEAT(N, X) { \
506 if ((N & 1) != 0) {X;} \
507 if ((N & 2) != 0) {X; X;} \
508 if ((N & 4) != 0) {X; X; X; X;} \
509}
510
511#define BROTLI_UNUSED(X) (void)(X)
512
513#define BROTLI_MIN_MAX(T) \
514 static BROTLI_INLINE T brotli_min_ ## T (T a, T b) { return a < b ? a : b; } \
515 static BROTLI_INLINE T brotli_max_ ## T (T a, T b) { return a > b ? a : b; }
516BROTLI_MIN_MAX(double) BROTLI_MIN_MAX(float) BROTLI_MIN_MAX(int)
517BROTLI_MIN_MAX(size_t) BROTLI_MIN_MAX(uint32_t) BROTLI_MIN_MAX(uint8_t)
518#undef BROTLI_MIN_MAX
519#define BROTLI_MIN(T, A, B) (brotli_min_ ## T((A), (B)))
520#define BROTLI_MAX(T, A, B) (brotli_max_ ## T((A), (B)))
521
522#define BROTLI_SWAP(T, A, I, J) { \
523 T __brotli_swap_tmp = (A)[(I)]; \
524 (A)[(I)] = (A)[(J)]; \
525 (A)[(J)] = __brotli_swap_tmp; \
526}
527
528#if BROTLI_64_BITS
529#if BROTLI_GNUC_HAS_BUILTIN(__builtin_ctzll, 3, 4, 0) || \
530 BROTLI_INTEL_VERSION_CHECK(16, 0, 0)
531#define BROTLI_TZCNT64 __builtin_ctzll
532#elif BROTLI_MSVC_VERSION_CHECK(12, 0, 0)
533#if defined(BROTLI_TARGET_X64)
534#define BROTLI_TZCNT64 _tzcnt_u64
535#else /* BROTLI_TARGET_X64 */
536static BROTLI_INLINE uint32_t BrotliBsf64Msvc(uint64_t x) {
537 uint32_t lsb;
538 _BitScanForward64(&lsb, x);
539 return lsb;
540}
541#define BROTLI_TZCNT64 BrotliBsf64Msvc
542#endif /* BROTLI_TARGET_X64 */
543#endif /* __builtin_ctzll */
544#endif /* BROTLI_64_BITS */
545
546#if BROTLI_GNUC_HAS_BUILTIN(__builtin_clz, 3, 4, 0) || \
547 BROTLI_INTEL_VERSION_CHECK(16, 0, 0)
548#define BROTLI_BSR32(x) (31u ^ (uint32_t)__builtin_clz(x))
549#elif BROTLI_MSVC_VERSION_CHECK(12, 0, 0)
550static BROTLI_INLINE uint32_t BrotliBsr32Msvc(uint32_t x) {
551 unsigned long msb;
552 _BitScanReverse(&msb, x);
553 return (uint32_t)msb;
554}
555#define BROTLI_BSR32 BrotliBsr32Msvc
556#endif /* __builtin_clz */
557
558/* Default brotli_alloc_func */
559BROTLI_COMMON_API void* BrotliDefaultAllocFunc(void* opaque, size_t size);
560
561/* Default brotli_free_func */
562BROTLI_COMMON_API void BrotliDefaultFreeFunc(void* opaque, void* address);
563
564BROTLI_UNUSED_FUNCTION void BrotliSuppressUnusedFunctions(void) {
565 BROTLI_UNUSED(&BrotliSuppressUnusedFunctions);
566 BROTLI_UNUSED(&BrotliUnalignedRead16);
567 BROTLI_UNUSED(&BrotliUnalignedRead32);
568 BROTLI_UNUSED(&BrotliUnalignedRead64);
569 BROTLI_UNUSED(&BrotliUnalignedWrite64);
570 BROTLI_UNUSED(&BROTLI_UNALIGNED_LOAD16LE);
571 BROTLI_UNUSED(&BROTLI_UNALIGNED_LOAD32LE);
572 BROTLI_UNUSED(&BROTLI_UNALIGNED_LOAD64LE);
573 BROTLI_UNUSED(&BROTLI_UNALIGNED_STORE64LE);
574 BROTLI_UNUSED(&BrotliRBit);
575 BROTLI_UNUSED(&brotli_min_double);
576 BROTLI_UNUSED(&brotli_max_double);
577 BROTLI_UNUSED(&brotli_min_float);
578 BROTLI_UNUSED(&brotli_max_float);
579 BROTLI_UNUSED(&brotli_min_int);
580 BROTLI_UNUSED(&brotli_max_int);
581 BROTLI_UNUSED(&brotli_min_size_t);
582 BROTLI_UNUSED(&brotli_max_size_t);
583 BROTLI_UNUSED(&brotli_min_uint32_t);
584 BROTLI_UNUSED(&brotli_max_uint32_t);
585 BROTLI_UNUSED(&brotli_min_uint8_t);
586 BROTLI_UNUSED(&brotli_max_uint8_t);
587 BROTLI_UNUSED(&BrotliDefaultAllocFunc);
588 BROTLI_UNUSED(&BrotliDefaultFreeFunc);
589#if defined(BROTLI_DEBUG) || defined(BROTLI_ENABLE_LOG)
590 BROTLI_UNUSED(&BrotliDump);
591#endif
592}
593
594#endif /* BROTLI_COMMON_PLATFORM_H_ */
BrotliDefaultAllocFunc
void * BrotliDefaultAllocFunc(void *opaque, size_t size)
Definition platform.c:13
BROTLI_COMMON_API
#define BROTLI_COMMON_API
Definition port.h:283
input
#define input(b, o, c, n, m)
Definition compress42.c:610
output
#define output(b, o, c, n)
Definition compress42.c:592
brotli_reg_t
#define brotli_reg_t
Definition platform.h:243
BrotliSuppressUnusedFunctions
BROTLI_UNUSED_FUNCTION void BrotliSuppressUnusedFunctions(void)
Definition platform.h:564
BrotliDefaultFreeFunc
BROTLI_COMMON_API void BrotliDefaultFreeFunc(void *opaque, void *address)
Definition platform.c:19
BROTLI_ALIGNED
#define BROTLI_ALIGNED(N)
Definition platform.h:189
size
size_t size
Definition platform.h:559
BROTLI_UNUSED_FUNCTION
#define BROTLI_UNUSED_FUNCTION
Definition platform.h:183
BROTLI_UNUSED
#define BROTLI_UNUSED(X)
Definition platform.h:511
BROTLI_INLINE
#define BROTLI_INLINE
Definition platform.h:136
BROTLI_MIN_MAX
#define BROTLI_MIN_MAX(T)
Definition platform.h:513
const
#define const
Definition zconf.h:230
f
#define f(i)
Definition sha256.c:46
in
const lzma_allocator const uint8_t * in
Definition block.h:527
out
const lzma_allocator const uint8_t size_t uint8_t * out
Definition block.h:528
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