dynamic-type.h \
elf.h \
events.h \
+ jhash.h \
logging.h \
macros.h \
patient.h \
--- /dev/null
+/*
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#ifndef _UST_COMMON_JHASH_H
+#define _UST_COMMON_JHASH_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <urcu/compiler.h>
+#include <lttng/ust-endian.h>
+
+/*
+ * Hash function
+ * Source: http://burtleburtle.net/bob/c/lookup3.c
+ * Originally Public Domain
+ */
+
+#define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
+
+#define mix(a, b, c) \
+do { \
+ a -= c; a ^= rot(c, 4); c += b; \
+ b -= a; b ^= rot(a, 6); a += c; \
+ c -= b; c ^= rot(b, 8); b += a; \
+ a -= c; a ^= rot(c, 16); c += b; \
+ b -= a; b ^= rot(a, 19); a += c; \
+ c -= b; c ^= rot(b, 4); b += a; \
+} while (0)
+
+#define final(a, b, c) \
+{ \
+ c ^= b; c -= rot(b, 14); \
+ a ^= c; a -= rot(c, 11); \
+ b ^= a; b -= rot(a, 25); \
+ c ^= b; c -= rot(b, 16); \
+ a ^= c; a -= rot(c, 4);\
+ b ^= a; b -= rot(a, 14); \
+ c ^= b; c -= rot(b, 24); \
+}
+
+#if (BYTE_ORDER == LITTLE_ENDIAN)
+#define HASH_LITTLE_ENDIAN 1
+#else
+#define HASH_LITTLE_ENDIAN 0
+#endif
+
+/*
+ *
+ * hashlittle() -- hash a variable-length key into a 32-bit value
+ * k : the key (the unaligned variable-length array of bytes)
+ * length : the length of the key, counting by bytes
+ * initval : can be any 4-byte value
+ * Returns a 32-bit value. Every bit of the key affects every bit of
+ * the return value. Two keys differing by one or two bits will have
+ * totally different hash values.
+ *
+ * The best hash table sizes are powers of 2. There is no need to do
+ * mod a prime (mod is sooo slow!). If you need less than 32 bits,
+ * use a bitmask. For example, if you need only 10 bits, do
+ * h = (h & hashmask(10));
+ * In which case, the hash table should have hashsize(10) elements.
+ *
+ * If you are hashing n strings (uint8_t **)k, do it like this:
+ * for (i = 0, h = 0; i < n; ++i) h = hashlittle(k[i], len[i], h);
+ *
+ * By Bob Jenkins, 2006. bob_jenkins@burtleburtle.net. You may use this
+ * code any way you wish, private, educational, or commercial. It's free.
+ *
+ * Use for hash table lookup, or anything where one collision in 2^^32 is
+ * acceptable. Do NOT use for cryptographic purposes.
+ */
+static
+uint32_t hashlittle(const void *key, size_t length, uint32_t initval)
+{
+ uint32_t a, b, c; /* internal state */
+ union {
+ const void *ptr;
+ size_t i;
+ } u;
+
+ /* Set up the internal state */
+ a = b = c = 0xdeadbeef + ((uint32_t)length) + initval;
+
+ u.ptr = key;
+ if (HASH_LITTLE_ENDIAN && ((u.i & 0x3) == 0)) {
+ const uint32_t *k = (const uint32_t *) key; /* read 32-bit chunks */
+
+ /*------ all but last block: aligned reads and affect 32 bits of (a,b,c) */
+ while (length > 12) {
+ a += k[0];
+ b += k[1];
+ c += k[2];
+ mix(a, b, c);
+ length -= 12;
+ k += 3;
+ }
+
+ /*----------------------------- handle the last (probably partial) block */
+ /*
+ * The original jhash.h reads beyond the end of string, and implements
+ * a special code path for VALGRIND. It seems to make ASan unhappy too
+ * though, so considering that hashing event names is not a fast-path
+ * in lttng-ust, remove the "fast" code entirely and use the slower
+ * but verifiable VALGRIND version of the code which does not issue
+ * out-of-bound reads.
+ */
+ {
+ const uint8_t *k8;
+
+ k8 = (const uint8_t *) k;
+ switch (length) {
+ case 12: c+=k[2]; b+=k[1]; a+=k[0]; break;
+ case 11: c+=((uint32_t) k8[10])<<16; /* fall through */
+ case 10: c+=((uint32_t) k8[9])<<8; /* fall through */
+ case 9 : c+=k8[8]; /* fall through */
+ case 8 : b+=k[1]; a+=k[0]; break;
+ case 7 : b+=((uint32_t) k8[6])<<16; /* fall through */
+ case 6 : b+=((uint32_t) k8[5])<<8; /* fall through */
+ case 5 : b+=k8[4]; /* fall through */
+ case 4 : a+=k[0]; break;
+ case 3 : a+=((uint32_t) k8[2])<<16; /* fall through */
+ case 2 : a+=((uint32_t) k8[1])<<8; /* fall through */
+ case 1 : a+=k8[0]; break;
+ case 0 : return c;
+ }
+ }
+
+ } else if (HASH_LITTLE_ENDIAN && ((u.i & 0x1) == 0)) {
+ const uint16_t *k = (const uint16_t *) key; /* read 16-bit chunks */
+ const uint8_t *k8;
+
+ /*--------------- all but last block: aligned reads and different mixing */
+ while (length > 12)
+ {
+ a += k[0] + (((uint32_t) k[1])<<16);
+ b += k[2] + (((uint32_t) k[3])<<16);
+ c += k[4] + (((uint32_t) k[5])<<16);
+ mix(a, b, c);
+ length -= 12;
+ k += 6;
+ }
+
+ /*----------------------------- handle the last (probably partial) block */
+ k8 = (const uint8_t *) k;
+ switch(length)
+ {
+ case 12: c+=k[4]+(((uint32_t) k[5])<<16);
+ b+=k[2]+(((uint32_t) k[3])<<16);
+ a+=k[0]+(((uint32_t) k[1])<<16);
+ break;
+ case 11: c+=((uint32_t) k8[10])<<16; /* fall through */
+ case 10: c+=k[4];
+ b+=k[2]+(((uint32_t) k[3])<<16);
+ a+=k[0]+(((uint32_t) k[1])<<16);
+ break;
+ case 9 : c+=k8[8]; /* fall through */
+ case 8 : b+=k[2]+(((uint32_t) k[3])<<16);
+ a+=k[0]+(((uint32_t) k[1])<<16);
+ break;
+ case 7 : b+=((uint32_t) k8[6])<<16; /* fall through */
+ case 6 : b+=k[2];
+ a+=k[0]+(((uint32_t) k[1])<<16);
+ break;
+ case 5 : b+=k8[4]; /* fall through */
+ case 4 : a+=k[0]+(((uint32_t) k[1])<<16);
+ break;
+ case 3 : a+=((uint32_t) k8[2])<<16; /* fall through */
+ case 2 : a+=k[0];
+ break;
+ case 1 : a+=k8[0];
+ break;
+ case 0 : return c; /* zero length requires no mixing */
+ }
+
+ } else { /* need to read the key one byte at a time */
+ const uint8_t *k = (const uint8_t *)key;
+
+ /*--------------- all but the last block: affect some 32 bits of (a, b, c) */
+ while (length > 12) {
+ a += k[0];
+ a += ((uint32_t) k[1])<<8;
+ a += ((uint32_t) k[2])<<16;
+ a += ((uint32_t) k[3])<<24;
+ b += k[4];
+ b += ((uint32_t) k[5])<<8;
+ b += ((uint32_t) k[6])<<16;
+ b += ((uint32_t) k[7])<<24;
+ c += k[8];
+ c += ((uint32_t) k[9])<<8;
+ c += ((uint32_t) k[10])<<16;
+ c += ((uint32_t) k[11])<<24;
+ mix(a,b,c);
+ length -= 12;
+ k += 12;
+ }
+
+ /*-------------------------------- last block: affect all 32 bits of (c) */
+ switch (length) { /* all the case statements fall through */
+ case 12: c+=((uint32_t) k[11])<<24; /* fall through */
+ case 11: c+=((uint32_t) k[10])<<16; /* fall through */
+ case 10: c+=((uint32_t) k[9])<<8; /* fall through */
+ case 9 : c+=k[8]; /* fall through */
+ case 8 : b+=((uint32_t) k[7])<<24; /* fall through */
+ case 7 : b+=((uint32_t) k[6])<<16; /* fall through */
+ case 6 : b+=((uint32_t) k[5])<<8; /* fall through */
+ case 5 : b+=k[4]; /* fall through */
+ case 4 : a+=((uint32_t) k[3])<<24; /* fall through */
+ case 3 : a+=((uint32_t) k[2])<<16; /* fall through */
+ case 2 : a+=((uint32_t) k[1])<<8; /* fall through */
+ case 1 : a+=k[0];
+ break;
+ case 0 : return c;
+ }
+ }
+
+ final(a, b, c);
+ return c;
+}
+
+static inline
+uint32_t jhash(const void *key, size_t length, uint32_t seed)
+{
+ return hashlittle(key, length, seed);
+}
+
+#endif /* _UST_COMMON_JHASH_H */
tracepoint-weak-test.c \
tracepoint-internal.h \
lttng-tracer-core.h \
- jhash.h \
error.h
liblttng_ust_tracepoint_la_LIBADD = \
tracepoint-internal.h \
events.h \
clock.h \
- jhash.h \
lttng-ust-uuid.h \
error.h \
tracef.c \
+++ /dev/null
-/*
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- */
-
-#include <stddef.h>
-#include <stdint.h>
-#include <urcu/compiler.h>
-#include <lttng/ust-endian.h>
-
-/*
- * Hash function
- * Source: http://burtleburtle.net/bob/c/lookup3.c
- * Originally Public Domain
- */
-
-#define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
-
-#define mix(a, b, c) \
-do { \
- a -= c; a ^= rot(c, 4); c += b; \
- b -= a; b ^= rot(a, 6); a += c; \
- c -= b; c ^= rot(b, 8); b += a; \
- a -= c; a ^= rot(c, 16); c += b; \
- b -= a; b ^= rot(a, 19); a += c; \
- c -= b; c ^= rot(b, 4); b += a; \
-} while (0)
-
-#define final(a, b, c) \
-{ \
- c ^= b; c -= rot(b, 14); \
- a ^= c; a -= rot(c, 11); \
- b ^= a; b -= rot(a, 25); \
- c ^= b; c -= rot(b, 16); \
- a ^= c; a -= rot(c, 4);\
- b ^= a; b -= rot(a, 14); \
- c ^= b; c -= rot(b, 24); \
-}
-
-#if (BYTE_ORDER == LITTLE_ENDIAN)
-#define HASH_LITTLE_ENDIAN 1
-#else
-#define HASH_LITTLE_ENDIAN 0
-#endif
-
-/*
- *
- * hashlittle() -- hash a variable-length key into a 32-bit value
- * k : the key (the unaligned variable-length array of bytes)
- * length : the length of the key, counting by bytes
- * initval : can be any 4-byte value
- * Returns a 32-bit value. Every bit of the key affects every bit of
- * the return value. Two keys differing by one or two bits will have
- * totally different hash values.
- *
- * The best hash table sizes are powers of 2. There is no need to do
- * mod a prime (mod is sooo slow!). If you need less than 32 bits,
- * use a bitmask. For example, if you need only 10 bits, do
- * h = (h & hashmask(10));
- * In which case, the hash table should have hashsize(10) elements.
- *
- * If you are hashing n strings (uint8_t **)k, do it like this:
- * for (i = 0, h = 0; i < n; ++i) h = hashlittle(k[i], len[i], h);
- *
- * By Bob Jenkins, 2006. bob_jenkins@burtleburtle.net. You may use this
- * code any way you wish, private, educational, or commercial. It's free.
- *
- * Use for hash table lookup, or anything where one collision in 2^^32 is
- * acceptable. Do NOT use for cryptographic purposes.
- */
-static
-uint32_t hashlittle(const void *key, size_t length, uint32_t initval)
-{
- uint32_t a, b, c; /* internal state */
- union {
- const void *ptr;
- size_t i;
- } u;
-
- /* Set up the internal state */
- a = b = c = 0xdeadbeef + ((uint32_t)length) + initval;
-
- u.ptr = key;
- if (HASH_LITTLE_ENDIAN && ((u.i & 0x3) == 0)) {
- const uint32_t *k = (const uint32_t *) key; /* read 32-bit chunks */
-
- /*------ all but last block: aligned reads and affect 32 bits of (a,b,c) */
- while (length > 12) {
- a += k[0];
- b += k[1];
- c += k[2];
- mix(a, b, c);
- length -= 12;
- k += 3;
- }
-
- /*----------------------------- handle the last (probably partial) block */
- /*
- * The original jhash.h reads beyond the end of string, and implements
- * a special code path for VALGRIND. It seems to make ASan unhappy too
- * though, so considering that hashing event names is not a fast-path
- * in lttng-ust, remove the "fast" code entirely and use the slower
- * but verifiable VALGRIND version of the code which does not issue
- * out-of-bound reads.
- */
- {
- const uint8_t *k8;
-
- k8 = (const uint8_t *) k;
- switch (length) {
- case 12: c+=k[2]; b+=k[1]; a+=k[0]; break;
- case 11: c+=((uint32_t) k8[10])<<16; /* fall through */
- case 10: c+=((uint32_t) k8[9])<<8; /* fall through */
- case 9 : c+=k8[8]; /* fall through */
- case 8 : b+=k[1]; a+=k[0]; break;
- case 7 : b+=((uint32_t) k8[6])<<16; /* fall through */
- case 6 : b+=((uint32_t) k8[5])<<8; /* fall through */
- case 5 : b+=k8[4]; /* fall through */
- case 4 : a+=k[0]; break;
- case 3 : a+=((uint32_t) k8[2])<<16; /* fall through */
- case 2 : a+=((uint32_t) k8[1])<<8; /* fall through */
- case 1 : a+=k8[0]; break;
- case 0 : return c;
- }
- }
-
- } else if (HASH_LITTLE_ENDIAN && ((u.i & 0x1) == 0)) {
- const uint16_t *k = (const uint16_t *) key; /* read 16-bit chunks */
- const uint8_t *k8;
-
- /*--------------- all but last block: aligned reads and different mixing */
- while (length > 12)
- {
- a += k[0] + (((uint32_t) k[1])<<16);
- b += k[2] + (((uint32_t) k[3])<<16);
- c += k[4] + (((uint32_t) k[5])<<16);
- mix(a, b, c);
- length -= 12;
- k += 6;
- }
-
- /*----------------------------- handle the last (probably partial) block */
- k8 = (const uint8_t *) k;
- switch(length)
- {
- case 12: c+=k[4]+(((uint32_t) k[5])<<16);
- b+=k[2]+(((uint32_t) k[3])<<16);
- a+=k[0]+(((uint32_t) k[1])<<16);
- break;
- case 11: c+=((uint32_t) k8[10])<<16; /* fall through */
- case 10: c+=k[4];
- b+=k[2]+(((uint32_t) k[3])<<16);
- a+=k[0]+(((uint32_t) k[1])<<16);
- break;
- case 9 : c+=k8[8]; /* fall through */
- case 8 : b+=k[2]+(((uint32_t) k[3])<<16);
- a+=k[0]+(((uint32_t) k[1])<<16);
- break;
- case 7 : b+=((uint32_t) k8[6])<<16; /* fall through */
- case 6 : b+=k[2];
- a+=k[0]+(((uint32_t) k[1])<<16);
- break;
- case 5 : b+=k8[4]; /* fall through */
- case 4 : a+=k[0]+(((uint32_t) k[1])<<16);
- break;
- case 3 : a+=((uint32_t) k8[2])<<16; /* fall through */
- case 2 : a+=k[0];
- break;
- case 1 : a+=k8[0];
- break;
- case 0 : return c; /* zero length requires no mixing */
- }
-
- } else { /* need to read the key one byte at a time */
- const uint8_t *k = (const uint8_t *)key;
-
- /*--------------- all but the last block: affect some 32 bits of (a, b, c) */
- while (length > 12) {
- a += k[0];
- a += ((uint32_t) k[1])<<8;
- a += ((uint32_t) k[2])<<16;
- a += ((uint32_t) k[3])<<24;
- b += k[4];
- b += ((uint32_t) k[5])<<8;
- b += ((uint32_t) k[6])<<16;
- b += ((uint32_t) k[7])<<24;
- c += k[8];
- c += ((uint32_t) k[9])<<8;
- c += ((uint32_t) k[10])<<16;
- c += ((uint32_t) k[11])<<24;
- mix(a,b,c);
- length -= 12;
- k += 12;
- }
-
- /*-------------------------------- last block: affect all 32 bits of (c) */
- switch (length) { /* all the case statements fall through */
- case 12: c+=((uint32_t) k[11])<<24; /* fall through */
- case 11: c+=((uint32_t) k[10])<<16; /* fall through */
- case 10: c+=((uint32_t) k[9])<<8; /* fall through */
- case 9 : c+=k[8]; /* fall through */
- case 8 : b+=((uint32_t) k[7])<<24; /* fall through */
- case 7 : b+=((uint32_t) k[6])<<16; /* fall through */
- case 6 : b+=((uint32_t) k[5])<<8; /* fall through */
- case 5 : b+=k[4]; /* fall through */
- case 4 : a+=((uint32_t) k[3])<<24; /* fall through */
- case 3 : a+=((uint32_t) k[2])<<16; /* fall through */
- case 2 : a+=((uint32_t) k[1])<<8; /* fall through */
- case 1 : a+=k[0];
- break;
- case 0 : return c;
- }
- }
-
- final(a, b, c);
- return c;
-}
-
-static inline
-uint32_t jhash(const void *key, size_t length, uint32_t seed)
-{
- return hashlittle(key, length, seed);
-}
#include "context-internal.h"
#include "lttng-tracer-core.h"
-#include "jhash.h"
+#include "common/jhash.h"
#include "context-provider-internal.h"
#include "common/macros.h"
#include "common/ringbuffer/frontend_types.h"
#include "common/ringbuffer/frontend.h"
#include "common/counter/counter.h"
-#include "jhash.h"
+#include "common/jhash.h"
#include <lttng/ust-abi.h>
#include "context-provider-internal.h"
#include <ctype.h>
#include "lttng-tracer-core.h"
-#include "jhash.h"
+#include "common/jhash.h"
#include "error.h"
#include "lib/lttng-ust/events.h"
#include "common/macros.h"
#include "lttng-tracer-core.h"
#include "lttng-ust-statedump.h"
-#include "jhash.h"
+#include "common/jhash.h"
#include "common/getenv.h"
#include "lib/lttng-ust/events.h"
#include "tracepoint-internal.h"
#include "lttng-tracer-core.h"
-#include "jhash.h"
+#include "common/jhash.h"
#include "error.h"
/* Test compiler support for weak symbols with hidden visibility. */
#include "lttng-tracer-core.h"
#include "lttng-rb-clients.h"
#include "lttng-counter-client.h"
-#include "jhash.h"
+#include "common/jhash.h"
static CDS_LIST_HEAD(lttng_transport_list);
static CDS_LIST_HEAD(lttng_counter_transport_list);
projects / lttng-ust.git / commitdiff
