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Pure, const and malloc attributes to libavutil.

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Patch by Zuxy Meng: zuxy meng gmail com
Original thread:
[FFmpeg-devel] [PATCH] Pure, const and malloc attributes to libavutil
Date: 03/18/2008 6:09 AM

Originally committed as revision 12489 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Zuxy Meng 2008-03-18 15:27:15 +00:00 committed by Benoit Fouet
parent 38c669d853
commit 6544f48f03
13 changed files with 78 additions and 55 deletions
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2
libavutil/adler32.h
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@ -24,6 +24,6 @@
#include <stdint.h>
unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf,
unsigned int len);
unsigned int len) av_pure;
#endif /* FFMPEG_ADLER32_H */

6
libavutil/bswap.h
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@ -40,7 +40,7 @@
# define LEGACY_REGS "=q"
#endif
static av_always_inline uint16_t bswap_16(uint16_t x)
static av_always_inline av_const uint16_t bswap_16(uint16_t x)
{
#if defined(ARCH_X86)
__asm("rorw $8, %0" :
@ -54,7 +54,7 @@ static av_always_inline uint16_t bswap_16(uint16_t x)
return x;
}
static av_always_inline uint32_t bswap_32(uint32_t x)
static av_always_inline av_const uint32_t bswap_32(uint32_t x)
{
#if defined(ARCH_X86)
#ifdef HAVE_BSWAP
@ -93,7 +93,7 @@ static av_always_inline uint32_t bswap_32(uint32_t x)
return x;
}
static inline uint64_t bswap_64(uint64_t x)
static inline uint64_t av_const bswap_64(uint64_t x)
{
#if 0
x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);

32
libavutil/common.h
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@ -57,6 +57,22 @@
#endif
#endif
#ifndef av_pure
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
# define av_pure __attribute__((pure))
#else
# define av_pure
#endif
#endif
#ifndef av_const
#if defined(__GNUC__) && (__GNUC__ > 2 || __GNUC__ == 2 && __GNUC_MINOR__ > 5)
# define av_const __attribute__((const))
#else
# define av_const
#endif
#endif
#ifdef HAVE_AV_CONFIG_H
# include "internal.h"
#endif /* HAVE_AV_CONFIG_H */
@ -94,7 +110,7 @@
/* misc math functions */
extern const uint8_t ff_log2_tab[256];
static inline int av_log2(unsigned int v)
static inline av_const int av_log2(unsigned int v)
{
int n = 0;
if (v & 0xffff0000) {
@ -110,7 +126,7 @@ static inline int av_log2(unsigned int v)
return n;
}
static inline int av_log2_16bit(unsigned int v)
static inline av_const int av_log2_16bit(unsigned int v)
{
int n = 0;
if (v & 0xff00) {
@ -123,7 +139,7 @@ static inline int av_log2_16bit(unsigned int v)
}
/* median of 3 */
static inline int mid_pred(int a, int b, int c)
static inline av_const int mid_pred(int a, int b, int c)
{
#ifdef HAVE_CMOV
int i=b;
@ -170,7 +186,7 @@ static inline int mid_pred(int a, int b, int c)
* @param amax maximum value of the clip range
* @return clipped value
*/
static inline int av_clip(int a, int amin, int amax)
static inline av_const int av_clip(int a, int amin, int amax)
{
if (a < amin) return amin;
else if (a > amax) return amax;
@ -182,7 +198,7 @@ static inline int av_clip(int a, int amin, int amax)
* @param a value to clip
* @return clipped value
*/
static inline uint8_t av_clip_uint8(int a)
static inline av_const uint8_t av_clip_uint8(int a)
{
if (a&(~255)) return (-a)>>31;
else return a;
@ -193,19 +209,19 @@ static inline uint8_t av_clip_uint8(int a)
* @param a value to clip
* @return clipped value
*/
static inline int16_t av_clip_int16(int a)
static inline av_const int16_t av_clip_int16(int a)
{
if ((a+32768) & ~65535) return (a>>31) ^ 32767;
else return a;
}
/* math */
int64_t ff_gcd(int64_t a, int64_t b);
int64_t av_const ff_gcd(int64_t a, int64_t b);
/**
* converts fourcc string to int
*/
static inline int ff_get_fourcc(const char *s){
static inline av_pure int ff_get_fourcc(const char *s){
#ifdef HAVE_AV_CONFIG_H
assert( strlen(s)==4 );
#endif

2
libavutil/crc.h
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@ -37,7 +37,7 @@ typedef enum {
int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);
const AVCRC *av_crc_get_table(AVCRCId crc_id);
uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length);
uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length) av_pure;
#endif /* FFMPEG_CRC_H */

1
libavutil/des.c
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@ -19,6 +19,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <inttypes.h>
#include "common.h"
#include "des.h"
#define T(a, b, c, d, e, f, g, h) 64-a,64-b,64-c,64-d,64-e,64-f,64-g,64-h

2
libavutil/des.h
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@ -34,6 +34,6 @@
* If your input data is in 8-bit blocks treat it as big-endian
* (use e.g. AV_RB64 and AV_WB64).
*/
uint64_t ff_des_encdec(uint64_t in, uint64_t key, int decrypt);
uint64_t ff_des_encdec(uint64_t in, uint64_t key, int decrypt) av_const;
#endif /* FFMPEG_DES_H */

18
libavutil/integer.h
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@ -36,26 +36,26 @@ typedef struct AVInteger{
uint16_t v[AV_INTEGER_SIZE];
} AVInteger;
AVInteger av_add_i(AVInteger a, AVInteger b);
AVInteger av_sub_i(AVInteger a, AVInteger b);
AVInteger av_add_i(AVInteger a, AVInteger b) av_const;
AVInteger av_sub_i(AVInteger a, AVInteger b) av_const;
/**
* returns the rounded down value of the logarithm of base 2 of the given AVInteger.
* this is simply the index of the most significant bit which is 1. Or 0 of all bits are 0
*/
int av_log2_i(AVInteger a);
AVInteger av_mul_i(AVInteger a, AVInteger b);
int av_log2_i(AVInteger a) av_const;
AVInteger av_mul_i(AVInteger a, AVInteger b) av_const;
/**
* returns 0 if a==b, 1 if a>b and -1 if a<b.
*/
int av_cmp_i(AVInteger a, AVInteger b);
int av_cmp_i(AVInteger a, AVInteger b) av_const;
/**
* bitwise shift.
* @param s the number of bits by which the value should be shifted right, may be negative for shifting left
*/
AVInteger av_shr_i(AVInteger a, int s);
AVInteger av_shr_i(AVInteger a, int s) av_const;
/**
* returns a % b.
@ -66,18 +66,18 @@ AVInteger av_mod_i(AVInteger *quot, AVInteger a, AVInteger b);
/**
* returns a/b.
*/
AVInteger av_div_i(AVInteger a, AVInteger b);
AVInteger av_div_i(AVInteger a, AVInteger b) av_const;
/**
* converts the given int64_t to an AVInteger.
*/
AVInteger av_int2i(int64_t a);
AVInteger av_int2i(int64_t a) av_const;
/**
* converts the given AVInteger to an int64_t.
* if the AVInteger is too large to fit into an int64_t,
* then only the least significant 64bit will be used
*/
int64_t av_i2int(AVInteger a);
int64_t av_i2int(AVInteger a) av_const;
#endif /* FFMPEG_INTEGER_H */

12
libavutil/internal.h
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@ -172,7 +172,7 @@ extern const uint8_t ff_sqrt_tab[256];
static inline int av_log2_16bit(unsigned int v);
static inline unsigned int ff_sqrt(unsigned int a)
static inline av_const unsigned int ff_sqrt(unsigned int a)
{
unsigned int b;
@ -267,35 +267,35 @@ if((y)<(x)){\
}
#ifndef HAVE_LLRINT
static av_always_inline long long llrint(double x)
static av_always_inline av_const long long llrint(double x)
{
return rint(x);
}
#endif /* HAVE_LLRINT */
#ifndef HAVE_LRINT
static av_always_inline long int lrint(double x)
static av_always_inline av_const long int lrint(double x)
{
return rint(x);
}
#endif /* HAVE_LRINT */
#ifndef HAVE_LRINTF
static av_always_inline long int lrintf(float x)
static av_always_inline av_const long int lrintf(float x)
{
return (int)(rint(x));
}
#endif /* HAVE_LRINTF */
#ifndef HAVE_ROUND
static av_always_inline double round(double x)
static av_always_inline av_const double round(double x)
{
return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
}
#endif /* HAVE_ROUND */
#ifndef HAVE_ROUNDF
static av_always_inline float roundf(float x)
static av_always_inline av_const float roundf(float x)
{
return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
}

12
libavutil/intfloat_readwrite.h
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@ -30,11 +30,11 @@ typedef struct AVExtFloat {
uint8_t mantissa[8];
} AVExtFloat;
double av_int2dbl(int64_t v);
float av_int2flt(int32_t v);
double av_ext2dbl(const AVExtFloat ext);
int64_t av_dbl2int(double d);
int32_t av_flt2int(float d);
AVExtFloat av_dbl2ext(double d);
double av_int2dbl(int64_t v) av_const;
float av_int2flt(int32_t v) av_const;
double av_ext2dbl(const AVExtFloat ext) av_const;
int64_t av_dbl2int(double d) av_const;
int32_t av_flt2int(float d) av_const;
AVExtFloat av_dbl2ext(double d) av_const;
#endif /* FFMPEG_INTFLOAT_READWRITE_H */

6
libavutil/mathematics.h
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@ -36,17 +36,17 @@ enum AVRounding {
* rescale a 64bit integer with rounding to nearest.
* a simple a*b/c isn't possible as it can overflow
*/
int64_t av_rescale(int64_t a, int64_t b, int64_t c);
int64_t av_rescale(int64_t a, int64_t b, int64_t c) av_const;
/**
* rescale a 64bit integer with specified rounding.
* a simple a*b/c isn't possible as it can overflow
*/
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding);
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_const;
/**
* rescale a 64bit integer by 2 rational numbers.
*/
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq);
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const;
#endif /* FFMPEG_MATHEMATICS_H */

12
libavutil/mem.h
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@ -42,6 +42,12 @@
#define DECLARE_ASM_CONST(n,t,v) static const t v
#endif
#ifdef __GNUC__
#define av_malloc_attrib __attribute__((__malloc__))
#else
#define av_malloc_attrib
#endif
/**
* Allocate a block of \p size bytes with alignment suitable for all
* memory accesses (including vectors if available on the CPU).
@ -50,7 +56,7 @@
* it.
* @see av_mallocz()
*/
void *av_malloc(unsigned int size);
void *av_malloc(unsigned int size) av_malloc_attrib;
/**
* Allocate or reallocate a block of memory.
@ -85,7 +91,7 @@ void av_free(void *ptr);
* it.
* @see av_malloc()
*/
void *av_mallocz(unsigned int size);
void *av_mallocz(unsigned int size) av_malloc_attrib;
/**
* Duplicate the string \p s.
@ -93,7 +99,7 @@ void *av_mallocz(unsigned int size);
* @return Pointer to a newly allocated string containing a
* copy of \p s or NULL if it cannot be allocated.
*/
char *av_strdup(const char *s);
char *av_strdup(const char *s) av_malloc_attrib;
/**
* Free a memory block which has been allocated with av_malloc(z)() or

10
libavutil/rational.h
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@ -78,7 +78,7 @@ int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max)
* @param c second rational.
* @return b*c.
*/
AVRational av_mul_q(AVRational b, AVRational c);
AVRational av_mul_q(AVRational b, AVRational c) av_const;
/**
* Divides one rational by another.
@ -86,7 +86,7 @@ AVRational av_mul_q(AVRational b, AVRational c);
* @param c second rational.
* @return b/c.
*/
AVRational av_div_q(AVRational b, AVRational c);
AVRational av_div_q(AVRational b, AVRational c) av_const;
/**
* Adds two rationals.
@ -94,7 +94,7 @@ AVRational av_div_q(AVRational b, AVRational c);
* @param c second rational.
* @return b+c.
*/
AVRational av_add_q(AVRational b, AVRational c);
AVRational av_add_q(AVRational b, AVRational c) av_const;
/**
* Subtracts one rational from another.
@ -102,7 +102,7 @@ AVRational av_add_q(AVRational b, AVRational c);
* @param c second rational.
* @return b-c.
*/
AVRational av_sub_q(AVRational b, AVRational c);
AVRational av_sub_q(AVRational b, AVRational c) av_const;
/**
* Converts a double precision floating point number to a rational.
@ -110,6 +110,6 @@ AVRational av_sub_q(AVRational b, AVRational c);
* @param max the maximum allowed numerator and denominator
* @return (AVRational) d.
*/
AVRational av_d2q(double d, int max);
AVRational av_d2q(double d, int max) av_const;
#endif /* FFMPEG_RATIONAL_H */

18
libavutil/softfloat.h
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@ -32,7 +32,7 @@ typedef struct SoftFloat{
int32_t mant;
}SoftFloat;
static SoftFloat av_normalize_sf(SoftFloat a){
static av_const SoftFloat av_normalize_sf(SoftFloat a){
if(a.mant){
#if 1
while((a.mant + 0x20000000U)<0x40000000U){
@ -54,7 +54,7 @@ static SoftFloat av_normalize_sf(SoftFloat a){
return a;
}
static inline SoftFloat av_normalize1_sf(SoftFloat a){
static inline av_const SoftFloat av_normalize1_sf(SoftFloat a){
#if 1
if(a.mant + 0x40000000 < 0){
a.exp++;
@ -76,7 +76,7 @@ static inline SoftFloat av_normalize1_sf(SoftFloat a){
* normalized then the output wont be worse then the other input
* if both are normalized then the output will be normalized
*/
static inline SoftFloat av_mul_sf(SoftFloat a, SoftFloat b){
static inline av_const SoftFloat av_mul_sf(SoftFloat a, SoftFloat b){
a.exp += b.exp;
a.mant = (a.mant * (int64_t)b.mant) >> ONE_BITS;
return av_normalize1_sf(a);
@ -87,31 +87,31 @@ static inline SoftFloat av_mul_sf(SoftFloat a, SoftFloat b){
* b has to be normalized and not zero
* @return will not be more denormalized then a
*/
static SoftFloat av_div_sf(SoftFloat a, SoftFloat b){
static av_const SoftFloat av_div_sf(SoftFloat a, SoftFloat b){
a.exp -= b.exp+1;
a.mant = ((int64_t)a.mant<<(ONE_BITS+1)) / b.mant;
return av_normalize1_sf(a);
}
static inline int av_cmp_sf(SoftFloat a, SoftFloat b){
static inline av_const int av_cmp_sf(SoftFloat a, SoftFloat b){
int t= a.exp - b.exp;
if(t<0) return (a.mant >> (-t)) - b.mant ;
else return a.mant - (b.mant >> t);
}
static inline SoftFloat av_add_sf(SoftFloat a, SoftFloat b){
static inline av_const SoftFloat av_add_sf(SoftFloat a, SoftFloat b){
int t= a.exp - b.exp;
if(t<0) return av_normalize1_sf((SoftFloat){b.exp, b.mant + (a.mant >> (-t))});
else return av_normalize1_sf((SoftFloat){a.exp, a.mant + (b.mant >> t )});
}
static inline SoftFloat av_sub_sf(SoftFloat a, SoftFloat b){
static inline av_const SoftFloat av_sub_sf(SoftFloat a, SoftFloat b){
return av_add_sf(a, (SoftFloat){b.exp, -b.mant});
}
//FIXME sqrt, log, exp, pow, sin, cos
static inline SoftFloat av_int2sf(int v, int frac_bits){
static inline av_const SoftFloat av_int2sf(int v, int frac_bits){
return av_normalize_sf((SoftFloat){ONE_BITS-frac_bits, v});
}
@ -119,7 +119,7 @@ static inline SoftFloat av_int2sf(int v, int frac_bits){
*
* rounding is to -inf
*/
static inline int av_sf2int(SoftFloat v, int frac_bits){
static inline av_const int av_sf2int(SoftFloat v, int frac_bits){
v.exp += frac_bits - ONE_BITS;
if(v.exp >= 0) return v.mant << v.exp ;
else return v.mant >>(-v.exp);