/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2010. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* NOTE: This file contains the BIF's for the *module* binary in stdlib.
* other BIF's concerning binaries are in binary.c.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include "erl_vm.h"
#include "global.h"
#include "erl_process.h"
#include "error.h"
#include "bif.h"
#include "big.h"
#include "erl_binary.h"
#include "erl_bits.h"
/*
* The native implementation functions for the module binary.
* Searching is implemented using aither Boyer-More or Aho-Corasick
* depending on number of searchstrings (BM if one, AC if more than one).
* Native implementation is mostly for efficiency, nothing
* (except binary:referenced_byte_size) really *needs* to be implemented
* in native code.
*/
/* #define HARDDEBUG */
/* Init and local variables */
static Export binary_match_trap_export;
static BIF_RETTYPE binary_match_trap(BIF_ALIST_3);
static Export binary_matches_trap_export;
static BIF_RETTYPE binary_matches_trap(BIF_ALIST_3);
static Export binary_longest_prefix_trap_export;
static BIF_RETTYPE binary_longest_prefix_trap(BIF_ALIST_3);
static Export binary_longest_suffix_trap_export;
static BIF_RETTYPE binary_longest_suffix_trap(BIF_ALIST_3);
static Export binary_bin_to_list_trap_export;
static BIF_RETTYPE binary_bin_to_list_trap(BIF_ALIST_3);
static Export binary_copy_trap_export;
static BIF_RETTYPE binary_copy_trap(BIF_ALIST_2);
static Uint max_loop_limit;
void erts_init_bif_binary(void)
{
sys_memset((void *) &binary_match_trap_export, 0, sizeof(Export));
binary_match_trap_export.address = &binary_match_trap_export.code[3];
binary_match_trap_export.code[0] = am_erlang;
binary_match_trap_export.code[1] = am_binary_match_trap;
binary_match_trap_export.code[2] = 3;
binary_match_trap_export.code[3] = (BeamInstr) em_apply_bif;
binary_match_trap_export.code[4] = (BeamInstr) &binary_match_trap;
sys_memset((void *) &binary_matches_trap_export, 0, sizeof(Export));
binary_matches_trap_export.address = &binary_matches_trap_export.code[3];
binary_matches_trap_export.code[0] = am_erlang;
binary_matches_trap_export.code[1] = am_binary_matches_trap;
binary_matches_trap_export.code[2] = 3;
binary_matches_trap_export.code[3] = (BeamInstr) em_apply_bif;
binary_matches_trap_export.code[4] = (BeamInstr) &binary_matches_trap;
sys_memset((void *) &binary_longest_prefix_trap_export, 0, sizeof(Export));
binary_longest_prefix_trap_export.address = &binary_longest_prefix_trap_export.code[3];
binary_longest_prefix_trap_export.code[0] = am_erlang;
binary_longest_prefix_trap_export.code[1] = am_binary_longest_prefix_trap;
binary_longest_prefix_trap_export.code[2] = 3;
binary_longest_prefix_trap_export.code[3] = (BeamInstr) em_apply_bif;
binary_longest_prefix_trap_export.code[4] = (BeamInstr) &binary_longest_prefix_trap;
sys_memset((void *) &binary_longest_suffix_trap_export, 0, sizeof(Export));
binary_longest_suffix_trap_export.address = &binary_longest_suffix_trap_export.code[3];
binary_longest_suffix_trap_export.code[0] = am_erlang;
binary_longest_suffix_trap_export.code[1] = am_binary_longest_suffix_trap;
binary_longest_suffix_trap_export.code[2] = 3;
binary_longest_suffix_trap_export.code[3] = (BeamInstr) em_apply_bif;
binary_longest_suffix_trap_export.code[4] = (BeamInstr) &binary_longest_suffix_trap;
sys_memset((void *) &binary_bin_to_list_trap_export, 0, sizeof(Export));
binary_bin_to_list_trap_export.address = &binary_bin_to_list_trap_export.code[3];
binary_bin_to_list_trap_export.code[0] = am_erlang;
binary_bin_to_list_trap_export.code[1] = am_binary_bin_to_list_trap;
binary_bin_to_list_trap_export.code[2] = 3;
binary_bin_to_list_trap_export.code[3] = (BeamInstr) em_apply_bif;
binary_bin_to_list_trap_export.code[4] = (BeamInstr) &binary_bin_to_list_trap;
sys_memset((void *) &binary_copy_trap_export, 0, sizeof(Export));
binary_copy_trap_export.address = &binary_copy_trap_export.code[3];
binary_copy_trap_export.code[0] = am_erlang;
binary_copy_trap_export.code[1] = am_binary_copy_trap;
binary_copy_trap_export.code[2] = 2;
binary_copy_trap_export.code[3] = (BeamInstr) em_apply_bif;
binary_copy_trap_export.code[4] = (BeamInstr) &binary_copy_trap;
max_loop_limit = 0;
return;
}
/*
* Setting the loop_limit for searches for debugging
*/
Sint erts_binary_set_loop_limit(Sint limit)
{
Sint save = (Sint) max_loop_limit;
if (limit <= 0) {
max_loop_limit = 0;
} else {
max_loop_limit = (Uint) limit;
}
return save;
}
static Uint get_reds(Process *p, int loop_factor)
{
Uint reds = ERTS_BIF_REDS_LEFT(p) * loop_factor;
Uint tmp = max_loop_limit;
if (tmp != 0 && tmp < reds) {
return tmp;
}
if (!reds) {
reds = 1;
}
return reds;
}
/*
* A micro allocator used when building search structures, just a convenience
* for building structures inside a pre alocated magic binary using
* conventional malloc-like interface.
*/
#define MYALIGN(Size) (SIZEOF_VOID_P * (((Size) / SIZEOF_VOID_P) + \
!!(((Size) % SIZEOF_VOID_P))))
#ifdef DEBUG
#define CHECK_ALLOCATOR(My) ASSERT((My).current <= ((My).mem + (My).size))
#else
#define CHECK_ALLOCATOR(My) /* nothing */
#endif
typedef struct _my_allocator {
Uint size;
byte *current;
byte *mem;
} MyAllocator;
static void init_my_allocator(MyAllocator *my, Uint siz, byte *array)
{
ASSERT((siz % SIZEOF_VOID_P) == 0);
my->size = siz;
my->mem = array;
my->current = my->mem;
}
static void *my_alloc(MyAllocator *my, Uint size)
{
void *ptr = my->current;
my->current += MYALIGN(size);
return ptr;
}
/*
* The search functionality.
*
* The search is byte oriented, which works nicely for UTF-8 as well as
* latin1 data
*/
#define ALPHABET_SIZE 256
typedef struct _ac_node {
#ifdef HARDDEBUG
Uint32 id; /* To identify h pointer targets when
dumping */
#endif
Uint32 d; /* Depth in trie, also represents the
length (-1) of the matched string if
in final set */
Sint32 final; /* Members in final set represent
* matches.
* The set representation is scattered
* among the nodes in this way:
* >0 -> this represents a member of
* the final set, <0 -> member of
* final set somewhere in the failure
* chain,
* 0 -> not member of the final set */
struct _ac_node *h; /* h(Hode) is the failure function */
struct _ac_node *g[ALPHABET_SIZE]; /* g(Node,Character) is the
transition function */
} ACNode;
typedef struct _ac_trie {
#ifdef HARDDEBUG
Uint32 idc;
#endif
Uint32 counter; /* Number of added patterns */
ACNode *root; /* pointer to the root state */
} ACTrie;
typedef struct _bm_data {
byte *x;
Sint len;
Sint *goodshift;
Sint badshift[ALPHABET_SIZE];
} BMData;
#ifdef HARDDEBUG
static void dump_bm_data(BMData *bm);
static void dump_ac_trie(ACTrie *act);
static void dump_ac_node(ACNode *node, int indent, int ch);
#endif
/*
* The needed size of binary data for a search structure - given the
* accumulated string lengths.
*/
#define BM_SIZE(StrLen) /* StrLen: length of searchstring */ \
((MYALIGN(sizeof(Sint) * (StrLen))) + /* goodshift array */ \
MYALIGN(StrLen) + /* searchstring saved */ \
(MYALIGN(sizeof(BMData)))) /* Structure */
#define AC_SIZE(StrLens) /* StrLens: sum of all searchstring lengths */ \
((MYALIGN(sizeof(ACNode)) * \
((StrLens)+1)) + /* The actual nodes (including rootnode) */ \
MYALIGN(sizeof(ACTrie))) /* Structure */
#ifndef MAX
#define MAX(A,B) (((A) > (B)) ? (A) : (B))
#endif
#ifndef MIN
#define MIN(A,B) (((A) > (B)) ? (B) : (A))
#endif
/*
* Callback for the magic binary
*/
static void cleanup_my_data_ac(Binary *bp)
{
return;
}
static void cleanup_my_data_bm(Binary *bp)
{
return;
}
/*
* Initiate a (allocated) micro allocator and fill in the base
* for an Aho-Corasick search trie, given the accumulated length of the search
* strings.
*/
static ACTrie *create_acdata(MyAllocator *my, Uint len,
ACNode ***qbuff /* out */,
Binary **the_bin /* out */)
{
Uint datasize = AC_SIZE(len);
ACTrie *act;
ACNode *acn;
Binary *mb = erts_create_magic_binary(datasize,cleanup_my_data_ac);
byte *data = ERTS_MAGIC_BIN_DATA(mb);
init_my_allocator(my, datasize, data);
act = my_alloc(my, sizeof(ACTrie)); /* Important that this is the first
allocation */
act->counter = 0;
act->root = acn = my_alloc(my, sizeof(ACNode));
acn->d = 0;
acn->final = 0;
acn->h = NULL;
memset(acn->g, 0, sizeof(ACNode *) * ALPHABET_SIZE);
#ifdef HARDDEBUG
act->idc = 0;
acn->id = 0;
#endif
*qbuff = erts_alloc(ERTS_ALC_T_TMP, sizeof(ACNode *) * len);
*the_bin = mb;
return act;
}
/*
* The same initialization of allocator and basic data for Boyer-More.
*/
static BMData *create_bmdata(MyAllocator *my, byte *x, Uint len,
Binary **the_bin /* out */)
{
Uint datasize = BM_SIZE(len);
BMData *bmd;
Binary *mb = erts_create_magic_binary(datasize,cleanup_my_data_bm);
byte *data = ERTS_MAGIC_BIN_DATA(mb);
init_my_allocator(my, datasize, data);
bmd = my_alloc(my, sizeof(BMData));
bmd->x = my_alloc(my,len);
memcpy(bmd->x,x,len);
bmd->len = len;
bmd->goodshift = my_alloc(my,sizeof(Uint) * len);
*the_bin = mb;
return bmd;
}
/*
* Compilation of search structures
*/
/*
* Aho Corasick - Build a Trie and fill in the failure functions
* when all strings are added.
* The algorithm is nicely described by Dieter B�hler of University of
* T�bingen:
* http://www-sr.informatik.uni-tuebingen.de/~buehler/AC/AC.html
*/
/*
* Helper called once for each search pattern
*/
static void ac_add_one_pattern(MyAllocator *my, ACTrie *act, byte *x, Uint len)
{
ACNode *acn = act->root;
Uint32 n = ++act->counter; /* Always increase conter, even if it's a
duplicate as this may identify the pattern
in the final set (not in current interface
though) */
Uint i = 0;
while(i < len) {
if (acn->g[x[i]] != NULL) {
/* node exists, continue */
acn = acn->g[x[i]];
++i;
} else {
/* allocate a new node */
ACNode *nn = my_alloc(my,sizeof(ACNode));
#ifdef HARDDEBUG
nn->id = ++(act->idc);
#endif
nn->d = i+1;
nn->h = act->root;
nn->final = 0;
memset(nn->g, 0, sizeof(ACNode *) * ALPHABET_SIZE);
acn->g[x[i]] = nn;
++i;
acn = nn;
}
}
if (acn->final == 0) { /* New pattern, add to final set */
acn->final = n;
}
}
/*
* Called when all search patterns are added.
*/
static void ac_compute_failure_functions(ACTrie *act, ACNode **qbuff)
{
ACNode *root = act->root;
ACNode *parent;
int i;
int qh = 0,qt = 0;
ACNode *child, *r;
/* Set all children of the root to have the root as failure function */
for (i = 0; i < ALPHABET_SIZE; ++i) {
if (root->g[i] != NULL) {
root->g[i]->h = root;
/* Add to que for later traversal */
qbuff[qt++] = root->g[i];
}
}
/* So, now we've handled children of the root state, traverse the
rest of the trie BF... */
while (qh < qt) {
parent = qbuff[qh++];
for (i = 0; i < ALPHABET_SIZE; ++ i) {
if ((child = parent->g[i]) != NULL) {
/* Visit this node to */
qbuff[qt++] = child;
/* Search for correct failure function, follow the parents
failure function until you find a similar transition
funtion to this childs */
r = parent->h;
while (r != NULL && r->g[i] == NULL) {
r = r->h;
}
if (r == NULL) {
/* Replace NULL failures with the root as we go */
child->h = (root->g[i] == NULL) ? root : root->g[i];
} else {
child->h = r->g[i];
/*
* The "final" set is scattered among the nodes. When
* the failure function points to a member of the final
* set, we have a match, but we might not see it in the
* current node if we dont mark it as a special type of
* final, i.e. foolow the failure function and you will
* find a real member of final set. This is marked with
* a negative string id and only done if this node does
* not represent a member in the final set.
*/
if (!(child->final) && (child->h->final)) {
child->final = -1;
}
}
}
}
}
/* Finally the failure function of the root should point to itself */
root->h = root;
}
/*
* The actual searching for needles in the haystack...
* Find first match using Aho-Coracick Trie
* return pattern number and fill in mpos + mlen if found, otherwise return 0
* Return the matching pattern that *starts* first, and ends
* last (difference when overlapping), hence the candidate thing.
* Basic AC finds the first end before the first start...
*
*/
typedef struct {
ACNode *q;
Uint pos;
Uint len;
ACNode *candidate;
Uint candidate_start;
} ACFindFirstState;
static void ac_init_find_first_match(ACFindFirstState *state, ACTrie *act, Sint startpos, Uint len)
{
state->q = act->root;
state->pos = startpos;
state->len = len;
state->candidate = NULL;
state->candidate_start = 0;
}
#define AC_OK 0
#define AC_NOT_FOUND -1
#define AC_RESTART -2
#define AC_LOOP_FACTOR 10
static int ac_find_first_match(ACFindFirstState *state, byte *haystack,
Uint *mpos, Uint *mlen, Uint *reductions)
{
ACNode *q = state->q;
Uint i = state->pos;
ACNode *candidate = state->candidate, *r;
Uint len = state->len;
Uint candidate_start = state->candidate_start;
Uint rstart;
register Uint reds = *reductions;
while (i < len) {
if (--reds == 0) {
state->q = q;
state->pos = i;
state->len = len;
state->candidate = candidate;
state->candidate_start = candidate_start;
return AC_RESTART;
}
while (q->g[haystack[i]] == NULL && q->h != q) {
q = q->h;
}
if (q->g[haystack[i]] != NULL) {
q = q->g[haystack[i]];
}
#ifdef HARDDEBUG
erts_printf("ch = %c, Current: %u\n", (int) haystack[i], (unsigned) q->id);
#endif
++i;
if (candidate != NULL && (i - q->d) > candidate_start) {
break;
}
if (q->final) {
r = q;
while (r->final < 0)
r = r->h;
rstart = i - r->d;
if (candidate == NULL || rstart < candidate_start ||
(rstart == candidate_start && candidate->d < q->d)) {
candidate_start = rstart;
candidate = r;
}
}
}
*reductions = reds;
if (!candidate) {
return AC_NOT_FOUND;
}
#ifdef HARDDEBUG
dump_ac_node(candidate,0,'?');
#endif
*mpos = candidate_start;
*mlen = candidate->d;
return AC_OK;
}
typedef struct _findall_data {
Uint pos;
Uint len;
#ifdef HARDDEBUG
Uint id;
#endif
Eterm epos;
Eterm elen;
} FindallData;
typedef struct {
ACNode *q;
Uint pos;
Uint len;
Uint m;
Uint allocated;
FindallData *out;
} ACFindAllState;
static void ac_init_find_all(ACFindAllState *state, ACTrie *act, Sint startpos, Uint len)
{
state->q = act->root;
state->pos = startpos;
state->len = len;
state->m = 0;
state->allocated = 0;
state->out = NULL;
}
static void ac_restore_find_all(ACFindAllState *state, char *buff)
{
memcpy(state,buff,sizeof(ACFindAllState));
state->out = erts_alloc(ERTS_ALC_T_TMP, sizeof(FindallData) * (state->allocated));
memcpy(state->out,buff+sizeof(ACFindAllState),sizeof(FindallData)*state->m);
}
static void ac_serialize_find_all(ACFindAllState *state, char *buff)
{
memcpy(buff,state,sizeof(ACFindAllState));
memcpy(buff+sizeof(ACFindAllState),state->out,sizeof(FindallData)*state->m);
}
static void ac_clean_find_all(ACFindAllState *state)
{
if (state->out != NULL) {
erts_free(ERTS_ALC_T_TMP, state->out);
}
#ifdef HARDDEBUG
state->out = NULL;
state->allocated = 0;
#endif
}
#define SIZEOF_AC_SERIALIZED_FIND_ALL_STATE(S) \
(sizeof(ACFindAllState)+(sizeof(FindallData)*(S).m))
/*
* Differs to the find_first function in that it stores all matches and the values
* arte returned only in the state.
*/
static int ac_find_all_non_overlapping(ACFindAllState *state, byte *haystack,
Uint *reductions)
{
ACNode *q = state->q;
Uint i = state->pos;
Uint rstart;
ACNode *r;
Uint len = state->len;
Uint m = state->m, save_m;
Uint allocated = state->allocated;
FindallData *out = state->out;
register Uint reds = *reductions;
while (i < len) {
if (--reds == 0) {
state->q = q;
state->pos = i;
state->len = len;
state->m = m;
state->allocated = allocated;
state->out = out;
return AC_RESTART;
}
while (q->g[haystack[i]] == NULL && q->h != q) {
q = q->h;
}
if (q->g[haystack[i]] != NULL) {
q = q->g[haystack[i]];
}
++i;
if (q->final) {
r = q;
while (r->final) {
while (r->final < 0)
r = r->h;
#ifdef HARDDEBUG
erts_printf("Trying to add %u\n",(unsigned) r->final);
#endif
rstart = i - r->d;
save_m = m;
while (m > 0 && (out[m-1].pos > rstart ||
(out[m-1].pos == rstart &&
out[m-1].len < r->d))) {
#ifdef HARDDEBUG
erts_printf("Popping %u\n",(unsigned) out[m-1].id);
#endif
--m;
}
#ifdef HARDDEBUG
if (m > 0) {
erts_printf("Pos %u\n",out[m-1].pos);
erts_printf("Len %u\n",out[m-1].len);
}
erts_printf("Rstart %u\n",rstart);
#endif
if (m == 0 || out[m-1].pos + out[m-1].len <= rstart) {
if (m >= allocated) {
if (!allocated) {
allocated = 10;
out = erts_alloc(ERTS_ALC_T_TMP,
sizeof(FindallData) * allocated);
} else {
allocated *= 2;
out = erts_realloc(ERTS_ALC_T_TMP, out,
sizeof(FindallData) *
allocated);
}
}
out[m].pos = rstart;
out[m].len = r->d;
#ifdef HARDDEBUG
out[m].id = r->final;
#endif
++m;
#ifdef HARDDEBUG
erts_printf("Pushing %u\n",(unsigned) out[m-1].id);
#endif
} else {
#ifdef HARDDEBUG
erts_printf("Backtracking %d steps\n",save_m - m);
#endif
m = save_m;
}
r = r->h;
}
}
}
*reductions = reds;
state->m = m;
state->out = out;
return (m == 0) ? AC_NOT_FOUND : AC_OK;
}
/*
* Boyer More - most obviously implemented more or less exactly as
* Christian Charras and Thierry Lecroq describes it in "Handbook of
* Exact String-Matching Algorithms"
* http://www-igm.univ-mlv.fr/~lecroq/string/
*/
/*
* Call this to compute badshifts array
*/
static void compute_badshifts(BMData *bmd)
{
Sint i;
Sint m = bmd->len;
for (i = 0; i < ALPHABET_SIZE; ++i) {
bmd->badshift[i] = m;
}
for (i = 0; i < m - 1; ++i) {
bmd->badshift[bmd->x[i]] = m - i - 1;
}
}
/* Helper for "compute_goodshifts" */
static void compute_suffixes(byte *x, Sint m, Sint *suffixes)
{
int f,g,i;
suffixes[m - 1] = m;
f = 0; /* To avoid use before set warning */
g = m - 1;
for (i = m - 2; i >= 0; --i) {
if (i > g && suffixes[i + m - 1 - f] < i - g) {
suffixes[i] = suffixes[i + m - 1 - f];
} else {
if (i < g) {
g = i;
}
f = i;
while ( g >= 0 && x[g] == x[g + m - 1 - f] ) {
--g;
}
suffixes[i] = f - g;
}
}
}
/*
* Call this to compute goodshift array
*/
static void compute_goodshifts(BMData *bmd)
{
Sint m = bmd->len;
byte *x = bmd->x;
Sint i, j;
Sint *suffixes = erts_alloc(ERTS_ALC_T_TMP, m * sizeof(Sint));
compute_suffixes(x, m, suffixes);
for (i = 0; i < m; ++i) {
bmd->goodshift[i] = m;
}
j = 0;
for (i = m - 1; i >= -1; --i) {
if (i == -1 || suffixes[i] == i + 1) {
while (j < m - 1 - i) {
if (bmd->goodshift[j] == m) {
bmd->goodshift[j] = m - 1 - i;
}
++j;
}
}
}
for (i = 0; i <= m - 2; ++i) {
bmd->goodshift[m - 1 - suffixes[i]] = m - 1 - i;
}
erts_free(ERTS_ALC_T_TMP, suffixes);
}
typedef struct {
Sint pos;
Sint len;
} BMFindFirstState;
#define BM_OK 0 /* used only for find_all */
#define BM_NOT_FOUND -1
#define BM_RESTART -2
#define BM_LOOP_FACTOR 10 /* Should we have a higher value? */
static void bm_init_find_first_match(BMFindFirstState *state, Sint startpos,
Uint len)
{
state->pos = startpos;
state->len = (Sint) len;
}
static Sint bm_find_first_match(BMFindFirstState *state, BMData *bmd,
byte *haystack, Uint *reductions)
{
Sint blen = bmd->len;
Sint len = state->len;
Sint *gs = bmd->goodshift;
Sint *bs = bmd->badshift;
byte *needle = bmd->x;
Sint i;
Sint j = state->pos;
register Uint reds = *reductions;
while (j <= len - blen) {
if (--reds == 0) {
state->pos = j;
return BM_RESTART;
}
for (i = blen - 1; i >= 0 && needle[i] == haystack[i + j]; --i)
;
if (i < 0) { /* found */
*reductions = reds;
return j;
}
j += MAX(gs[i],bs[haystack[i+j]] - blen + 1 + i);
}
*reductions = reds;
return BM_NOT_FOUND;
}
typedef struct {
Sint pos;
Sint len;
Uint m;
Uint allocated;
FindallData *out;
} BMFindAllState;
static void bm_init_find_all(BMFindAllState *state, Sint startpos, Uint len)
{
state->pos = startpos;
state->len = (Sint) len;
state->m = 0;
state->allocated = 0;
state->out = NULL;
}
static void bm_restore_find_all(BMFindAllState *state, char *buff)
{
memcpy(state,buff,sizeof(BMFindAllState));
state->out = erts_alloc(ERTS_ALC_T_TMP, sizeof(FindallData) *
(state->allocated));
memcpy(state->out,buff+sizeof(BMFindAllState),
sizeof(FindallData)*state->m);
}
static void bm_serialize_find_all(BMFindAllState *state, char *buff)
{
memcpy(buff,state,sizeof(BMFindAllState));
memcpy(buff+sizeof(BMFindAllState),state->out,
sizeof(FindallData)*state->m);
}
static void bm_clean_find_all(BMFindAllState *state)
{
if (state->out != NULL) {
erts_free(ERTS_ALC_T_TMP, state->out);
}
#ifdef HARDDEBUG
state->out = NULL;
state->allocated = 0;
#endif
}
#define SIZEOF_BM_SERIALIZED_FIND_ALL_STATE(S) \
(sizeof(BMFindAllState)+(sizeof(FindallData)*(S).m))
/*
* Differs to the find_first function in that it stores all matches and the
* values are returned only in the state.
*/
static Sint bm_find_all_non_overlapping(BMFindAllState *state,
BMData *bmd, byte *haystack,
Uint *reductions)
{
Sint blen = bmd->len;
Sint len = state->len;
Sint *gs = bmd->goodshift;
Sint *bs = bmd->badshift;
byte *needle = bmd->x;
Sint i;
Sint j = state->pos;
Uint m = state->m;
Uint allocated = state->allocated;
FindallData *out = state->out;
register Uint reds = *reductions;
while (j <= len - blen) {
if (--reds == 0) {
state->pos = j;
state->m = m;
state->allocated = allocated;
state->out = out;
return BM_RESTART;
}
for (i = blen - 1; i >= 0 && needle[i] == haystack[i + j]; --i)
;
if (i < 0) { /* found */
if (m >= allocated) {
if (!allocated) {
allocated = 10;
out = erts_alloc(ERTS_ALC_T_TMP, sizeof(FindallData) * allocated);
} else {
allocated *= 2;
out = erts_realloc(ERTS_ALC_T_TMP, out,
sizeof(FindallData) * allocated);
}
}
out[m].pos = j;
out[m].len = blen;
++m;
j += blen;
} else {
j += MAX(gs[i],bs[haystack[i+j]] - blen + 1 + i);
}
}
state->m = m;
state->out = out;
*reductions = reds;
return (m == 0) ? BM_NOT_FOUND : BM_OK;
}
/*
* Interface functions (i.e. "bif's")
*/
/*
* Search functionality interfaces
*/
static int do_binary_match_compile(Eterm argument, Eterm *tag, Binary **binp)
{
Eterm t, b, comp_term = NIL;
Uint characters;
Uint words;
characters = 0;
words = 0;
if (is_list(argument)) {
t = argument;
while (is_list(t)) {
b = CAR(list_val(t));
t = CDR(list_val(t));
if (!is_binary(b)) {
goto badarg;
}
if (binary_bitsize(b) != 0) {
goto badarg;
}
++words;
characters += binary_size(b);
}
if (is_not_nil(t)) {
goto badarg;
}
if (words > 1) {
comp_term = argument;
} else {
comp_term = CAR(list_val(argument));
}
} else if (is_binary(argument)) {
if (binary_bitsize(argument) != 0) {
goto badarg;
}
words = 1;
comp_term = argument;
characters = binary_size(argument);
}
if (characters == 0) {
goto badarg;
}
ASSERT(words > 0);
if (words == 1) {
byte *bytes;
Uint bitoffs, bitsize;
byte *temp_alloc = NULL;
MyAllocator my;
BMData *bmd;
Binary *bin;
ERTS_GET_BINARY_BYTES(comp_term, bytes, bitoffs, bitsize);
if (bitoffs != 0) {
bytes = erts_get_aligned_binary_bytes(comp_term, &temp_alloc);
}
bmd = create_bmdata(&my, bytes, characters, &bin);
compute_badshifts(bmd);
compute_goodshifts(bmd);
erts_free_aligned_binary_bytes(temp_alloc);
CHECK_ALLOCATOR(my);
*tag = am_bm;
*binp = bin;
return 0;
} else {
ACTrie *act;
MyAllocator my;
ACNode **qbuff;
Binary *bin;
act = create_acdata(&my, characters, &qbuff, &bin);
t = comp_term;
while (is_list(t)) {
byte *bytes;
Uint bitoffs, bitsize;
byte *temp_alloc = NULL;
b = CAR(list_val(t));
t = CDR(list_val(t));
ERTS_GET_BINARY_BYTES(b, bytes, bitoffs, bitsize);
if (bitoffs != 0) {
bytes = erts_get_aligned_binary_bytes(b, &temp_alloc);
}
ac_add_one_pattern(&my,act,bytes,binary_size(b));
erts_free_aligned_binary_bytes(temp_alloc);
}
ac_compute_failure_functions(act,qbuff);
CHECK_ALLOCATOR(my);
erts_free(ERTS_ALC_T_TMP,qbuff);
*tag = am_ac;
*binp = bin;
return 0;
}
badarg:
return -1;
}
BIF_RETTYPE binary_compile_pattern_1(BIF_ALIST_1)
{
Binary *bin;
Eterm tag, ret;
Eterm *hp;
if (do_binary_match_compile(BIF_ARG_1,&tag,&bin)) {
BIF_ERROR(BIF_P,BADARG);
}
hp = HAlloc(BIF_P, PROC_BIN_SIZE+3);
ret = erts_mk_magic_binary_term(&hp, &MSO(BIF_P), bin);
ret = TUPLE2(hp, tag, ret);
BIF_RET(ret);
}
#define DO_BIN_MATCH_OK 0
#define DO_BIN_MATCH_BADARG -1
#define DO_BIN_MATCH_RESTART -2
static int do_binary_match(Process *p, Eterm subject, Uint hsstart, Uint hsend,
Eterm type, Binary *bin, Eterm state_term,
Eterm *res_term)
{
byte *bytes;
Uint bitoffs, bitsize;
byte *temp_alloc = NULL;
ERTS_GET_BINARY_BYTES(subject, bytes, bitoffs, bitsize);
if (bitsize != 0) {
goto badarg;
}
if (bitoffs != 0) {
bytes = erts_get_aligned_binary_bytes(subject, &temp_alloc);
}
if (state_term != NIL) {
Eterm *ptr = big_val(state_term);
type = ptr[1];
}
if (type == am_bm) {
BMData *bm;
Sint pos;
Eterm ret;
Eterm *hp;
BMFindFirstState state;
Uint reds = get_reds(p, BM_LOOP_FACTOR);
Uint save_reds = reds;
bm = (BMData *) ERTS_MAGIC_BIN_DATA(bin);
#ifdef HARDDEBUG
dump_bm_data(bm);
#endif
if (state_term == NIL) {
bm_init_find_first_match(&state, hsstart, hsend);
} else {
Eterm *ptr = big_val(state_term);
memcpy(&state,ptr+2,sizeof(state));
}
#ifdef HARDDEBUG
erts_printf("(bm) state->pos = %ld, state->len = %lu\n",state.pos,
state.len);
#endif
pos = bm_find_first_match(&state, bm, bytes, &reds);
if (pos == BM_NOT_FOUND) {
ret = am_nomatch;
} else if (pos == BM_RESTART) {
int x = (sizeof(BMFindFirstState) / sizeof(Eterm)) +
!!(sizeof(BMFindFirstState) % sizeof(Eterm));
#ifdef HARDDEBUG
erts_printf("Trap bm!\n");
#endif
hp = HAlloc(p,x+2);
hp[0] = make_pos_bignum_header(x+1);
hp[1] = type;
memcpy(hp+2,&state,sizeof(state));
*res_term = make_big(hp);
erts_free_aligned_binary_bytes(temp_alloc);
return DO_BIN_MATCH_RESTART;
} else {
Eterm erlen = erts_make_integer((Uint) bm->len, p);
ret = erts_make_integer(pos,p);
hp = HAlloc(p,3);
ret = TUPLE2(hp, ret, erlen);
}
erts_free_aligned_binary_bytes(temp_alloc);
BUMP_REDS(p, (save_reds - reds) / BM_LOOP_FACTOR);
*res_term = ret;
return DO_BIN_MATCH_OK;
} else if (type == am_ac) {
ACTrie *act;
Uint pos, rlen;
int acr;
ACFindFirstState state;
Eterm ret;
Eterm *hp;
Uint reds = get_reds(p, AC_LOOP_FACTOR);
Uint save_reds = reds;
act = (ACTrie *) ERTS_MAGIC_BIN_DATA(bin);
#ifdef HARDDEBUG
dump_ac_trie(act);
#endif
if (state_term == NIL) {
ac_init_find_first_match(&state, act, hsstart, hsend);
} else {
Eterm *ptr = big_val(state_term);
memcpy(&state,ptr+2,sizeof(state));
}
acr = ac_find_first_match(&state, bytes, &pos, &rlen, &reds);
if (acr == AC_NOT_FOUND) {
ret = am_nomatch;
} else if (acr == AC_RESTART) {
int x = (sizeof(state) / sizeof(Eterm)) +
!!(sizeof(BMFindFirstState) % sizeof(Eterm));
#ifdef HARDDEBUG
erts_printf("Trap ac!\n");
#endif
hp = HAlloc(p,x+2);
hp[0] = make_pos_bignum_header(x+1);
hp[1] = type;
memcpy(hp+2,&state,sizeof(state));
*res_term = make_big(hp);
erts_free_aligned_binary_bytes(temp_alloc);
return DO_BIN_MATCH_RESTART;
} else {
Eterm epos = erts_make_integer(pos+hsstart,p);
Eterm erlen = erts_make_integer(rlen,p);
hp = HAlloc(p,3);
ret = TUPLE2(hp, epos, erlen);
}
erts_free_aligned_binary_bytes(temp_alloc);
BUMP_REDS(p, (save_reds - reds) / AC_LOOP_FACTOR);
*res_term = ret;
return DO_BIN_MATCH_OK;
}
badarg:
return DO_BIN_MATCH_BADARG;
}
static int do_binary_matches(Process *p, Eterm subject, Uint hsstart,
Uint hsend, Eterm type, Binary *bin,
Eterm state_term, Eterm *res_term)
{
byte *bytes;
Uint bitoffs, bitsize;
byte *temp_alloc = NULL;
ERTS_GET_BINARY_BYTES(subject, bytes, bitoffs, bitsize);
if (bitsize != 0) {
goto badarg;
}
if (bitoffs != 0) {
bytes = erts_get_aligned_binary_bytes(subject, &temp_alloc);
}
if (state_term != NIL) {
Eterm *ptr = big_val(state_term);
type = ptr[1];
}
if (type == am_bm) {
BMData *bm;
Sint pos;
Eterm ret,tpl;
Eterm *hp;
BMFindAllState state;
Uint reds = get_reds(p, BM_LOOP_FACTOR);
Uint save_reds = reds;
bm = (BMData *) ERTS_MAGIC_BIN_DATA(bin);
#ifdef HARDDEBUG
dump_bm_data(bm);
#endif
if (state_term == NIL) {
bm_init_find_all(&state, hsstart, hsend);
} else {
Eterm *ptr = big_val(state_term);
bm_restore_find_all(&state,(char *) (ptr+2));
}
pos = bm_find_all_non_overlapping(&state, bm, bytes, &reds);
if (pos == BM_NOT_FOUND) {
ret = NIL;
} else if (pos == BM_RESTART) {
int x =
(SIZEOF_BM_SERIALIZED_FIND_ALL_STATE(state) / sizeof(Eterm)) +
!!(SIZEOF_BM_SERIALIZED_FIND_ALL_STATE(state) % sizeof(Eterm));
#ifdef HARDDEBUG
erts_printf("Trap bm!\n");
#endif
hp = HAlloc(p,x+2);
hp[0] = make_pos_bignum_header(x+1);
hp[1] = type;
bm_serialize_find_all(&state, (char *) (hp+2));
*res_term = make_big(hp);
erts_free_aligned_binary_bytes(temp_alloc);
bm_clean_find_all(&state);
return DO_BIN_MATCH_RESTART;
} else {
FindallData *fad = state.out;
int i;
for (i = 0; i < state.m; ++i) {
fad[i].epos = erts_make_integer(fad[i].pos,p);
fad[i].elen = erts_make_integer(fad[i].len,p);
}
hp = HAlloc(p,state.m * (3 + 2));
ret = NIL;
for (i = state.m - 1; i >= 0; --i) {
tpl = TUPLE2(hp, fad[i].epos, fad[i].elen);
hp +=3;
ret = CONS(hp,tpl,ret);
hp += 2;
}
}
erts_free_aligned_binary_bytes(temp_alloc);
bm_clean_find_all(&state);
BUMP_REDS(p, (save_reds - reds) / BM_LOOP_FACTOR);
*res_term = ret;
return DO_BIN_MATCH_OK;
} else if (type == am_ac) {
ACTrie *act;
int acr;
ACFindAllState state;
Eterm ret,tpl;
Eterm *hp;
Uint reds = get_reds(p, AC_LOOP_FACTOR);
Uint save_reds = reds;
act = (ACTrie *) ERTS_MAGIC_BIN_DATA(bin);
#ifdef HARDDEBUG
dump_ac_trie(act);
#endif
if (state_term == NIL) {
ac_init_find_all(&state, act, hsstart, hsend);
} else {
Eterm *ptr = big_val(state_term);
ac_restore_find_all(&state,(char *) (ptr+2));
}
acr = ac_find_all_non_overlapping(&state, bytes, &reds);
if (acr == AC_NOT_FOUND) {
ret = NIL;
} else if (acr == AC_RESTART) {
int x =
(SIZEOF_AC_SERIALIZED_FIND_ALL_STATE(state) / sizeof(Eterm)) +
!!(SIZEOF_AC_SERIALIZED_FIND_ALL_STATE(state) % sizeof(Eterm));
#ifdef HARDDEBUG
erts_printf("Trap ac!\n");
#endif
hp = HAlloc(p,x+2);
hp[0] = make_pos_bignum_header(x+1);
hp[1] = type;
ac_serialize_find_all(&state, (char *) (hp+2));
*res_term = make_big(hp);
erts_free_aligned_binary_bytes(temp_alloc);
ac_clean_find_all(&state);
return DO_BIN_MATCH_RESTART;
} else {
FindallData *fad = state.out;
int i;
for (i = 0; i < state.m; ++i) {
fad[i].epos = erts_make_integer(fad[i].pos,p);
fad[i].elen = erts_make_integer(fad[i].len,p);
}
hp = HAlloc(p,state.m * (3 + 2));
ret = NIL;
for (i = state.m - 1; i >= 0; --i) {
tpl = TUPLE2(hp, fad[i].epos, fad[i].elen);
hp +=3;
ret = CONS(hp,tpl,ret);
hp += 2;
}
}
erts_free_aligned_binary_bytes(temp_alloc);
ac_clean_find_all(&state);
BUMP_REDS(p, (save_reds - reds) / AC_LOOP_FACTOR);
*res_term = ret;
return DO_BIN_MATCH_OK;
}
badarg:
return DO_BIN_MATCH_BADARG;
}
static int parse_match_opts_list(Eterm l, Eterm bin, Uint *posp, Uint *endp)
{
Eterm *tp;
Uint pos;
Sint len;
if (l == ((Eterm) 0) || l == NIL) {
/* Invalid term or NIL, we're called from binary_match(es)_2 or
have no options*/
*posp = 0;
*endp = binary_size(bin);
return 0;
} else if (is_list(l)) {
while(is_list(l)) {
Eterm t = CAR(list_val(l));
Uint orig_size;
if (!is_tuple(t)) {
goto badarg;
}
tp = tuple_val(t);
if (arityval(*tp) != 2) {
goto badarg;
}
if (tp[1] != am_scope || is_not_tuple(tp[2])) {
goto badarg;
}
tp = tuple_val(tp[2]);
if (arityval(*tp) != 2) {
goto badarg;
}
if (!term_to_Uint(tp[1], &pos)) {
goto badarg;
}
if (!term_to_Sint(tp[2], &len)) {
goto badarg;
}
if (len < 0) {
Sint lentmp = -len;
/* overflow */
if (lentmp == len || lentmp < 0 || -lentmp != len) {
goto badarg;
}
len = lentmp;
pos -= len;
}
/* overflow */
if ((pos + len) < pos || (len > 0 && (pos + len) == pos)) {
goto badarg;
}
*endp = len + pos;
*posp = pos;
if ((orig_size = binary_size(bin)) < pos ||
orig_size < (*endp)) {
goto badarg;
}
l = CDR(list_val(l));
}
return 0;
} else {
badarg:
return 1;
}
}
static BIF_RETTYPE binary_match_trap(BIF_ALIST_3)
{
int runres;
Eterm result;
Binary *bin = ((ProcBin *) binary_val(BIF_ARG_3))->val;
runres = do_binary_match(BIF_P,BIF_ARG_1,0,0,NIL,bin,BIF_ARG_2,&result);
if (runres == DO_BIN_MATCH_OK) {
BIF_RET(result);
} else {
BUMP_ALL_REDS(BIF_P);
BIF_TRAP3(&binary_match_trap_export, BIF_P, BIF_ARG_1, result,
BIF_ARG_3);
}
}
static BIF_RETTYPE binary_matches_trap(BIF_ALIST_3)
{
int runres;
Eterm result;
Binary *bin = ((ProcBin *) binary_val(BIF_ARG_3))->val;
runres = do_binary_matches(BIF_P,BIF_ARG_1,0,0,NIL,bin,BIF_ARG_2,&result);
if (runres == DO_BIN_MATCH_OK) {
BIF_RET(result);
} else {
BUMP_ALL_REDS(BIF_P);
BIF_TRAP3(&binary_matches_trap_export, BIF_P, BIF_ARG_1, result,
BIF_ARG_3);
}
}
BIF_RETTYPE binary_match_3(BIF_ALIST_3)
{
Uint hsstart;
Uint hsend;
Eterm *tp;
Eterm type;
Binary *bin;
Eterm bin_term = NIL;
int runres;
Eterm result;
if (is_not_binary(BIF_ARG_1)) {
goto badarg;
}
if (parse_match_opts_list(BIF_ARG_3,BIF_ARG_1,&hsstart,&hsend)) {
goto badarg;
}
if (hsend == 0) {
BIF_RET(am_nomatch);
}
if (is_tuple(BIF_ARG_2)) {
tp = tuple_val(BIF_ARG_2);
if (arityval(*tp) != 2 || is_not_atom(tp[1])) {
goto badarg;
}
if (((tp[1] != am_bm) && (tp[1] != am_ac)) ||
!ERTS_TERM_IS_MAGIC_BINARY(tp[2])) {
goto badarg;
}
type = tp[1];
bin = ((ProcBin *) binary_val(tp[2]))->val;
if (type == am_bm &&
ERTS_MAGIC_BIN_DESTRUCTOR(bin) != cleanup_my_data_bm) {
goto badarg;
}
if (type == am_ac &&
ERTS_MAGIC_BIN_DESTRUCTOR(bin) != cleanup_my_data_ac) {
goto badarg;
}
bin_term = tp[2];
} else if (do_binary_match_compile(BIF_ARG_2,&type,&bin)) {
goto badarg;
}
runres = do_binary_match(BIF_P,BIF_ARG_1,hsstart,hsend,type,bin,NIL,&result);
if (runres == DO_BIN_MATCH_RESTART && bin_term == NIL) {
Eterm *hp = HAlloc(BIF_P, PROC_BIN_SIZE);
bin_term = erts_mk_magic_binary_term(&hp, &MSO(BIF_P), bin);
} else if (bin_term == NIL) {
erts_bin_free(bin);
}
switch (runres) {
case DO_BIN_MATCH_OK:
BIF_RET(result);
case DO_BIN_MATCH_RESTART:
BUMP_ALL_REDS(BIF_P);
BIF_TRAP3(&binary_match_trap_export, BIF_P, BIF_ARG_1, result, bin_term);
default:
goto badarg;
}
badarg:
BIF_ERROR(BIF_P,BADARG);
}
BIF_RETTYPE binary_matches_3(BIF_ALIST_3)
{
Uint hsstart, hsend;
Eterm *tp;
Eterm type;
Binary *bin;
Eterm bin_term = NIL;
int runres;
Eterm result;
if (is_not_binary(BIF_ARG_1)) {
goto badarg;
}
if (parse_match_opts_list(BIF_ARG_3,BIF_ARG_1,&hsstart,&hsend)) {
goto badarg;
}
if (hsend == 0) {
BIF_RET(am_nomatch);
}
if (is_tuple(BIF_ARG_2)) {
tp = tuple_val(BIF_ARG_2);
if (arityval(*tp) != 2 || is_not_atom(tp[1])) {
goto badarg;
}
if (((tp[1] != am_bm) && (tp[1] != am_ac)) ||
!ERTS_TERM_IS_MAGIC_BINARY(tp[2])) {
goto badarg;
}
type = tp[1];
bin = ((ProcBin *) binary_val(tp[2]))->val;
if (type == am_bm &&
ERTS_MAGIC_BIN_DESTRUCTOR(bin) != cleanup_my_data_bm) {
goto badarg;
}
if (type == am_ac &&
ERTS_MAGIC_BIN_DESTRUCTOR(bin) != cleanup_my_data_ac) {
goto badarg;
}
bin_term = tp[2];
} else if (do_binary_match_compile(BIF_ARG_2,&type,&bin)) {
goto badarg;
}
runres = do_binary_matches(BIF_P,BIF_ARG_1,hsstart,hsend,type,bin,
NIL,&result);
if (runres == DO_BIN_MATCH_RESTART && bin_term == NIL) {
Eterm *hp = HAlloc(BIF_P, PROC_BIN_SIZE);
bin_term = erts_mk_magic_binary_term(&hp, &MSO(BIF_P), bin);
} else if (bin_term == NIL) {
erts_bin_free(bin);
}
switch (runres) {
case DO_BIN_MATCH_OK:
BIF_RET(result);
case DO_BIN_MATCH_RESTART:
BUMP_ALL_REDS(BIF_P);
BIF_TRAP3(&binary_matches_trap_export, BIF_P, BIF_ARG_1, result,
bin_term);
default:
goto badarg;
}
badarg:
BIF_ERROR(BIF_P,BADARG);
}
BIF_RETTYPE binary_match_2(BIF_ALIST_2)
{
return binary_match_3(BIF_P,BIF_ARG_1,BIF_ARG_2,((Eterm) 0));
}
BIF_RETTYPE binary_matches_2(BIF_ALIST_2)
{
return binary_matches_3(BIF_P,BIF_ARG_1,BIF_ARG_2,((Eterm) 0));
}
BIF_RETTYPE erts_binary_part(Process *p, Eterm binary, Eterm epos, Eterm elen)
{
Uint pos;
Sint len;
size_t orig_size;
Eterm orig;
Uint offset;
Uint bit_offset;
Uint bit_size;
Eterm* hp;
ErlSubBin* sb;
if (is_not_binary(binary)) {
goto badarg;
}
if (!term_to_Uint(epos, &pos)) {
goto badarg;
}
if (!term_to_Sint(elen, &len)) {
goto badarg;
}
if (len < 0) {
Sint lentmp = -len;
/* overflow */
if (lentmp == len || lentmp < 0 || -lentmp != len) {
goto badarg;
}
len = lentmp;
if (len > pos) {
goto badarg;
}
pos -= len;
}
/* overflow */
if ((pos + len) < pos || (len > 0 && (pos + len) == pos)){
goto badarg;
}
if ((orig_size = binary_size(binary)) < pos ||
orig_size < (pos + len)) {
goto badarg;
}
hp = HAlloc(p, ERL_SUB_BIN_SIZE);
ERTS_GET_REAL_BIN(binary, orig, offset, bit_offset, bit_size);
sb = (ErlSubBin *) hp;
sb->thing_word = HEADER_SUB_BIN;
sb->size = len;
sb->offs = offset + pos;
sb->orig = orig;
sb->bitoffs = bit_offset;
sb->bitsize = 0;
sb->is_writable = 0;
BIF_RET(make_binary(sb));
badarg:
BIF_ERROR(p, BADARG);
}
#define ERTS_NEED_GC(p, need) ((HEAP_LIMIT((p)) - HEAP_TOP((p))) <= (need))
BIF_RETTYPE erts_gc_binary_part(Process *p, Eterm *reg, Eterm live, int range_is_tuple)
{
Uint pos;
Sint len;
size_t orig_size;
Eterm orig;
Uint offset;
Uint bit_offset;
Uint bit_size;
Eterm* hp;
ErlSubBin* sb;
Eterm binary;
Eterm *tp;
Eterm epos, elen;
int extra_args;
if (range_is_tuple) {
Eterm tpl = reg[live];
extra_args = 1;
if (is_not_tuple(tpl)) {
goto badarg;
}
tp = tuple_val(tpl);
if (arityval(*tp) != 2) {
goto badarg;
}
epos = tp[1];
elen = tp[2];
} else {
extra_args = 2;
epos = reg[live-1];
elen = reg[live];
}
binary = reg[live-extra_args];
if (is_not_binary(binary)) {
goto badarg;
}
if (!term_to_Uint(epos, &pos)) {
goto badarg;
}
if (!term_to_Sint(elen, &len)) {
goto badarg;
}
if (len < 0) {
Sint lentmp = -len;
/* overflow */
if (lentmp == len || lentmp < 0 || -lentmp != len) {
goto badarg;
}
len = lentmp;
if (len > pos) {
goto badarg;
}
pos -= len;
}
/* overflow */
if ((pos + len) < pos || (len > 0 && (pos + len) == pos)) {
goto badarg;
}
if ((orig_size = binary_size(binary)) < pos ||
orig_size < (pos + len)) {
goto badarg;
}
if (ERTS_NEED_GC(p, ERL_SUB_BIN_SIZE)) {
erts_garbage_collect(p, ERL_SUB_BIN_SIZE, reg, live+1-extra_args); /* I don't need the tuple
or indices any more */
binary = reg[live-extra_args];
}
hp = p->htop;
p->htop += ERL_SUB_BIN_SIZE;
ERTS_GET_REAL_BIN(binary, orig, offset, bit_offset, bit_size);
sb = (ErlSubBin *) hp;
sb->thing_word = HEADER_SUB_BIN;
sb->size = len;
sb->offs = offset + pos;
sb->orig = orig;
sb->bitoffs = bit_offset;
sb->bitsize = 0;
sb->is_writable = 0;
BIF_RET(make_binary(sb));
badarg:
BIF_ERROR(p, BADARG);
}
/*************************************************************
* The actual guard BIFs are in erl_bif_guard.c
* but the implementation of both the non-gc and the gc
* variants are here. Note that the functions are named so that they do
* not clash with the guard bif's erlang:binary_part/2,3
*************************************************************/
BIF_RETTYPE binary_binary_part_3(BIF_ALIST_3)
{
return erts_binary_part(BIF_P,BIF_ARG_1,BIF_ARG_2, BIF_ARG_3);
}
BIF_RETTYPE binary_binary_part_2(BIF_ALIST_2)
{
Eterm *tp;
if (is_not_tuple(BIF_ARG_2)) {
goto badarg;
}
tp = tuple_val(BIF_ARG_2);
if (arityval(*tp) != 2) {
goto badarg;
}
return erts_binary_part(BIF_P,BIF_ARG_1,tp[1], tp[2]);
badarg:
BIF_ERROR(BIF_P,BADARG);
}
typedef struct {
int type; /* CL_TYPE_XXX */
byte *temp_alloc; /* Used for erts_get/free_aligned, i.e. CL_TYPE_ALIGNED */
unsigned char *buff; /* Used for all types, malloced if CL_TYPE_HEAP */
Uint bufflen; /* The length (in bytes) of buffer */
} CommonData;
#define COMMON_LOOP_FACTOR 10
#define DIRECTION_PREFIX 0
#define DIRECTION_SUFFIX 1
#define CL_OK 0
#define CL_RESTART 1
/* The type field in the above structure */
#define CL_TYPE_EMPTY 0 /* End of array */
#define CL_TYPE_HEAP 1
#define CL_TYPE_ALIGNED 2
#define CL_TYPE_COMMON 3 /* emacsulated */
#define CL_TYPE_HEAP_NOALLOC 4 /* Will need allocating when trapping */
static int do_search_forward(CommonData *cd, Uint *posp, Uint *redsp)
{
Uint pos = *posp;
Sint reds = (Sint) *redsp;
int i;
unsigned char current = 0;
for(;;) {
for(i = 0; cd[i].type != CL_TYPE_EMPTY; ++i) {
if (pos >= cd[i].bufflen) {
*posp = pos;
if (reds > 0) {
*redsp = (Uint) reds;
} else {
*redsp = 0;
}
return CL_OK;
}
if (i == 0) {
current = cd[i].buff[pos];
} else {
if (cd[i].buff[pos] != current) {
*posp = pos;
if (reds > 0) {
*redsp = (Uint) reds;
} else {
*redsp = 0;
}
return CL_OK;
}
}
--reds;
}
++pos;
if (reds <= 0) {
*posp = pos;
*redsp = 0;
return CL_RESTART;
}
}
}
static int do_search_backward(CommonData *cd, Uint *posp, Uint *redsp)
{
Uint pos = *posp;
Sint reds = (Sint) *redsp;
int i;
unsigned char current = 0;
for(;;) {
for(i = 0; cd[i].type != CL_TYPE_EMPTY; ++i) {
if (pos >= cd[i].bufflen) {
*posp = pos;
if (reds > 0) {
*redsp = (Uint) reds;
} else {
*redsp = 0;
}
return CL_OK;
}
if (i == 0) {
current = cd[i].buff[cd[i].bufflen - 1 - pos];
} else {
if (cd[i].buff[cd[i].bufflen - 1 - pos] != current) {
*posp = pos;
if (reds > 0) {
*redsp = (Uint) reds;
} else {
*redsp = 0;
}
return CL_OK;
}
}
--reds;
}
++pos;
if (reds <= 0) {
*posp = pos;
*redsp = 0;
return CL_RESTART;
}
}
}
static void cleanup_common_data(Binary *bp)
{
int i;
CommonData *cd;
cd = (CommonData *) ERTS_MAGIC_BIN_DATA(bp);
for (i=0;cd[i].type != CL_TYPE_EMPTY;++i) {
switch (cd[i].type) {
case CL_TYPE_HEAP:
erts_free(ERTS_ALC_T_BINARY_BUFFER,cd[i].buff);
break;
case CL_TYPE_ALIGNED:
erts_free_aligned_binary_bytes_extra(cd[i].temp_alloc, ERTS_ALC_T_BINARY_BUFFER);
break;
default:
break;
}
}
return;
}
static BIF_RETTYPE do_longest_common(Process *p, Eterm list, int direction)
{
Eterm l = list;
int n = 0;
Binary *mb;
CommonData *cd;
int i = 0;
Uint reds = get_reds(p, COMMON_LOOP_FACTOR);
Uint save_reds = reds;
int res;
Export *trapper;
Uint pos;
Eterm epos;
Eterm *hp;
Eterm bin_term;
Eterm b;
/* First just count the number of binaries */
while (is_list(l)) {
b = CAR(list_val(l));
if (!is_binary(b)) {
goto badarg;
}
++n;
l = CDR(list_val(l));
}
if (l != NIL || n == 0) {
goto badarg;
}
/* OK, now create a buffer of the right size, we can do a magic binary right away,
thats not to costly. */
mb = erts_create_magic_binary((n+1)*sizeof(CommonData),cleanup_common_data);
cd = (CommonData *) ERTS_MAGIC_BIN_DATA(mb);
l = list;
while (is_list(l)) {
Uint bitoffs;
Uint bitsize;
Uint offset;
Eterm real_bin;
ProcBin* pb;
cd[i].type = CL_TYPE_EMPTY;
b = CAR(list_val(l));
ERTS_GET_REAL_BIN(b, real_bin, offset, bitoffs, bitsize);
if (bitsize != 0) {
erts_bin_free(mb);
goto badarg;
}
cd[i].bufflen = binary_size(b);
cd[i].temp_alloc = NULL;
if (*(binary_val(real_bin)) == HEADER_PROC_BIN) {
pb = (ProcBin *) binary_val(real_bin);
if (pb->flags) {
erts_emasculate_writable_binary(pb);
}
cd[i].buff = erts_get_aligned_binary_bytes_extra(b, &(cd[i].temp_alloc),
ERTS_ALC_T_BINARY_BUFFER,0);
cd[i].type = (cd[i].temp_alloc != NULL) ? CL_TYPE_ALIGNED : CL_TYPE_COMMON;
} else { /* Heap binary */
cd[i].buff = erts_get_aligned_binary_bytes_extra(b, &(cd[i].temp_alloc),
ERTS_ALC_T_BINARY_BUFFER,0);
/* CL_TYPE_HEAP_NOALLOC means you have to copy if trapping */
cd[i].type = (cd[i].temp_alloc != NULL) ? CL_TYPE_ALIGNED : CL_TYPE_HEAP_NOALLOC;
}
++i;
l = CDR(list_val(l));
}
cd[i].type = CL_TYPE_EMPTY;
#if defined(DEBUG) || defined(VALGRIND)
cd[i].temp_alloc = NULL;
cd[i].buff = NULL;
cd[i].bufflen = 0;
#endif
pos = 0;
if (direction == DIRECTION_PREFIX) {
trapper = &binary_longest_prefix_trap_export;
res = do_search_forward(cd,&pos,&reds);
} else {
ASSERT(direction == DIRECTION_SUFFIX);
trapper = &binary_longest_suffix_trap_export;
res = do_search_backward(cd,&pos,&reds);
}
epos = erts_make_integer(pos,p);
if (res == CL_OK) {
erts_bin_free(mb);
BUMP_REDS(p, (save_reds - reds) / COMMON_LOOP_FACTOR);
BIF_RET(epos);
} else {
ASSERT(res == CL_RESTART);
/* Copy all heap binaries that are not already copied (aligned) */
for(i = 0; i < n; ++i) {
if (cd[i].type == CL_TYPE_HEAP_NOALLOC) {
unsigned char *tmp = cd[i].buff;
cd[i].buff = erts_alloc(ERTS_ALC_T_BINARY_BUFFER, cd[i].bufflen);
memcpy(cd[i].buff,tmp,cd[i].bufflen);
cd[i].type = CL_TYPE_HEAP;
}
}
hp = HAlloc(p, PROC_BIN_SIZE);
bin_term = erts_mk_magic_binary_term(&hp, &MSO(p), mb);
BUMP_ALL_REDS(p);
BIF_TRAP3(trapper, p, bin_term, epos,list);
}
badarg:
BIF_ERROR(p,BADARG);
}
static BIF_RETTYPE do_longest_common_trap(Process *p, Eterm bin_term, Eterm current_pos,
Eterm orig_list, int direction)
{
Uint reds = get_reds(p, COMMON_LOOP_FACTOR);
Uint save_reds = reds;
Uint pos;
Binary *bin;
CommonData *cd;
int res;
Eterm epos;
Export *trapper;
#ifdef DEBUG
int r;
r = term_to_Uint(current_pos, &pos);
ASSERT(r != 0);
#else
term_to_Uint(current_pos, &pos);
#endif
ASSERT(ERTS_TERM_IS_MAGIC_BINARY(bin_term));
bin = ((ProcBin *) binary_val(bin_term))->val;
cd = (CommonData *) ERTS_MAGIC_BIN_DATA(bin);
if (direction == DIRECTION_PREFIX) {
trapper = &binary_longest_prefix_trap_export;
res = do_search_forward(cd,&pos,&reds);
} else {
ASSERT(direction == DIRECTION_SUFFIX);
trapper = &binary_longest_suffix_trap_export;
res = do_search_backward(cd,&pos,&reds);
}
epos = erts_make_integer(pos,p);
if (res == CL_OK) {
BUMP_REDS(p, (save_reds - reds) / COMMON_LOOP_FACTOR);
BIF_RET(epos);
} else {
ASSERT(res == CL_RESTART);
/* Copy all heap binaries that are not already copied (aligned) */
BUMP_ALL_REDS(p);
BIF_TRAP3(trapper, p, bin_term, epos, orig_list);
}
}
static BIF_RETTYPE binary_longest_prefix_trap(BIF_ALIST_3)
{
return do_longest_common_trap(BIF_P,BIF_ARG_1,BIF_ARG_2,BIF_ARG_3,DIRECTION_PREFIX);
}
static BIF_RETTYPE binary_longest_suffix_trap(BIF_ALIST_3)
{
return do_longest_common_trap(BIF_P,BIF_ARG_1,BIF_ARG_2,BIF_ARG_3,DIRECTION_SUFFIX);
}
BIF_RETTYPE binary_longest_common_prefix_1(BIF_ALIST_1)
{
return do_longest_common(BIF_P,BIF_ARG_1,DIRECTION_PREFIX);
}
BIF_RETTYPE binary_longest_common_suffix_1(BIF_ALIST_1)
{
return do_longest_common(BIF_P,BIF_ARG_1,DIRECTION_SUFFIX);
}
BIF_RETTYPE binary_first_1(BIF_ALIST_1)
{
byte* bytes;
Uint byte_size;
Uint bit_offs;
Uint bit_size;
Uint res;
if (is_not_binary(BIF_ARG_1)) {
goto badarg;
}
byte_size = binary_size(BIF_ARG_1);
if (!byte_size) {
goto badarg;
}
ERTS_GET_BINARY_BYTES(BIF_ARG_1,bytes,bit_offs,bit_size);
if (bit_size) {
goto badarg;
}
if (bit_offs) {
res = ((((Uint) bytes[0]) << bit_offs) | (((Uint) bytes[1]) >> (8-bit_offs))) & 0xFF;
} else {
res = bytes[0];
}
BIF_RET(make_small(res));
badarg:
BIF_ERROR(BIF_P,BADARG);
}
BIF_RETTYPE binary_last_1(BIF_ALIST_1)
{
byte* bytes;
Uint byte_size;
Uint bit_offs;
Uint bit_size;
Uint res;
if (is_not_binary(BIF_ARG_1)) {
goto badarg;
}
byte_size = binary_size(BIF_ARG_1);
if (!byte_size) {
goto badarg;
}
ERTS_GET_BINARY_BYTES(BIF_ARG_1,bytes,bit_offs,bit_size);
if (bit_size) {
goto badarg;
}
if (bit_offs) {
res = ((((Uint) bytes[byte_size-1]) << bit_offs) |
(((Uint) bytes[byte_size]) >> (8-bit_offs))) & 0xFF;
} else {
res = bytes[byte_size-1];
}
BIF_RET(make_small(res));
badarg:
BIF_ERROR(BIF_P,BADARG);
}
BIF_RETTYPE binary_at_2(BIF_ALIST_2)
{
byte* bytes;
Uint byte_size;
Uint bit_offs;
Uint bit_size;
Uint res;
Uint index;
if (is_not_binary(BIF_ARG_1)) {
goto badarg;
}
byte_size = binary_size(BIF_ARG_1);
if (!byte_size) {
goto badarg;
}
if (!term_to_Uint(BIF_ARG_2, &index)) {
goto badarg;
}
if (index >= byte_size) {
goto badarg;
}
ERTS_GET_BINARY_BYTES(BIF_ARG_1,bytes,bit_offs,bit_size);
if (bit_size) {
goto badarg;
}
if (bit_offs) {
res = ((((Uint) bytes[index]) << bit_offs) |
(((Uint) bytes[index+1]) >> (8-bit_offs))) & 0xFF;
} else {
res = bytes[index];
}
BIF_RET(make_small(res));
badarg:
BIF_ERROR(BIF_P,BADARG);
}
#define BIN_TO_LIST_OK 0
#define BIN_TO_LIST_TRAP 1
/* No badarg, checked before call */
#define BIN_TO_LIST_LOOP_FACTOR 10
static int do_bin_to_list(Process *p, byte *bytes, Uint bit_offs,
Uint start, Sint *lenp, Eterm *termp)
{
Uint reds = get_reds(p, BIN_TO_LIST_LOOP_FACTOR); /* reds can never be 0 */
Uint len = *lenp;
Uint loops;
Eterm *hp;
Eterm term = *termp;
Uint n;
ASSERT(reds > 0);
loops = MIN(reds,len);
BUMP_REDS(p, loops / BIN_TO_LIST_LOOP_FACTOR);
hp = HAlloc(p,2*loops);
while (loops--) {
--len;
if (bit_offs) {
n = ((((Uint) bytes[start+len]) << bit_offs) |
(((Uint) bytes[start+len+1]) >> (8-bit_offs))) & 0xFF;
} else {
n = bytes[start+len];
}
term = CONS(hp,make_small(n),term);
hp +=2;
}
*termp = term;
*lenp = len;
if (len) {
BUMP_ALL_REDS(p);
return BIN_TO_LIST_TRAP;
}
return BIN_TO_LIST_OK;
}
static BIF_RETTYPE do_trap_bin_to_list(Process *p, Eterm binary,
Uint start, Sint len, Eterm sofar)
{
Eterm *hp;
Eterm blob;
hp = HAlloc(p,3);
hp[0] = make_pos_bignum_header(2);
hp[1] = start;
hp[2] = (Uint) len;
blob = make_big(hp);
BIF_TRAP3(&binary_bin_to_list_trap_export, p, binary, blob, sofar);
}
static BIF_RETTYPE binary_bin_to_list_trap(BIF_ALIST_3)
{
Eterm *ptr;
Uint start;
Sint len;
byte *bytes;
Uint bit_offs;
Uint bit_size;
Eterm res = BIF_ARG_3;
ptr = big_val(BIF_ARG_2);
start = ptr[1];
len = (Sint) ptr[2];
ERTS_GET_BINARY_BYTES(BIF_ARG_1,bytes,bit_offs,bit_size);
if (do_bin_to_list(BIF_P, bytes, bit_offs, start, &len, &res) ==
BIN_TO_LIST_OK) {
BIF_RET(res);
}
return do_trap_bin_to_list(BIF_P,BIF_ARG_1,start,len,res);
}
static BIF_RETTYPE binary_bin_to_list_common(Process *p,
Eterm bin,
Eterm epos,
Eterm elen)
{
Uint pos;
Sint len;
size_t sz;
byte *bytes;
Uint bit_offs;
Uint bit_size;
Eterm res = NIL;
if (is_not_binary(bin)) {
goto badarg;
}
if (!term_to_Uint(epos, &pos)) {
goto badarg;
}
if (!term_to_Sint(elen, &len)) {
goto badarg;
}
if (len < 0) {
Sint lentmp = -len;
/* overflow */
if (lentmp == len || lentmp < 0 || -lentmp != len) {
goto badarg;
}
len = lentmp;
if (len > pos) {
goto badarg;
}
pos -= len;
}
/* overflow */
if ((pos + len) < pos || (len > 0 && (pos + len) == pos)) {
goto badarg;
}
sz = binary_size(bin);
if (pos+len > sz) {
goto badarg;
}
ERTS_GET_BINARY_BYTES(bin,bytes,bit_offs,bit_size);
if (bit_size != 0) {
goto badarg;
}
if(do_bin_to_list(p, bytes, bit_offs, pos, &len, &res) ==
BIN_TO_LIST_OK) {
BIF_RET(res);
}
return do_trap_bin_to_list(p,bin,pos,len,res);
badarg:
BIF_ERROR(p,BADARG);
}
BIF_RETTYPE binary_bin_to_list_3(BIF_ALIST_3)
{
return binary_bin_to_list_common(BIF_P,BIF_ARG_1,BIF_ARG_2,BIF_ARG_3);
}
BIF_RETTYPE binary_bin_to_list_2(BIF_ALIST_2)
{
Eterm *tp;
if (is_not_tuple(BIF_ARG_2)) {
goto badarg;
}
tp = tuple_val(BIF_ARG_2);
if (arityval(*tp) != 2) {
goto badarg;
}
return binary_bin_to_list_common(BIF_P,BIF_ARG_1,tp[1],tp[2]);
badarg:
BIF_ERROR(BIF_P,BADARG);
}
BIF_RETTYPE binary_bin_to_list_1(BIF_ALIST_1)
{
Uint pos = 0;
Sint len;
byte *bytes;
Uint bit_offs;
Uint bit_size;
Eterm res = NIL;
if (is_not_binary(BIF_ARG_1)) {
goto badarg;
}
len = binary_size(BIF_ARG_1);
ERTS_GET_BINARY_BYTES(BIF_ARG_1,bytes,bit_offs,bit_size);
if (bit_size != 0) {
goto badarg;
}
if(do_bin_to_list(BIF_P, bytes, bit_offs, pos, &len, &res) ==
BIN_TO_LIST_OK) {
BIF_RET(res);
}
return do_trap_bin_to_list(BIF_P,BIF_ARG_1,pos,len,res);
badarg:
BIF_ERROR(BIF_P,BADARG);
}
/*
* Ok, erlang:list_to_binary does not interrupt, and we really don't want
* an alternative implementation for the exact same thing, why we
* have descided to use the old non-restarting implementation for now.
* In reality, there is seldom many iterations involved in doing this, so the
* problem of long-running-bif's is not really that big in this case.
* So, for now we use the old implementation also in the module binary.
*/
BIF_RETTYPE binary_list_to_bin_1(BIF_ALIST_1)
{
return erts_list_to_binary_bif(BIF_P, BIF_ARG_1);
}
typedef struct {
Uint times_left;
Uint source_size;
int source_type;
byte *source;
byte *temp_alloc;
Uint result_pos;
Binary *result;
} CopyBinState;
#define BC_TYPE_EMPTY 0
#define BC_TYPE_HEAP 1
#define BC_TYPE_ALIGNED 2 /* May or may not point to (emasculated) binary, temp_alloc field is set
so that erts_free_aligned_binary_bytes_extra can handle either */
#define BINARY_COPY_LOOP_FACTOR 100
static void cleanup_copy_bin_state(Binary *bp)
{
CopyBinState *cbs = (CopyBinState *) ERTS_MAGIC_BIN_DATA(bp);
if (cbs->result != NULL) {
erts_bin_free(cbs->result);
cbs->result = NULL;
}
switch (cbs->source_type) {
case BC_TYPE_HEAP:
erts_free(ERTS_ALC_T_BINARY_BUFFER,cbs->source);
break;
case BC_TYPE_ALIGNED:
erts_free_aligned_binary_bytes_extra(cbs->temp_alloc,
ERTS_ALC_T_BINARY_BUFFER);
break;
default:
/* otherwise do nothing */
break;
}
cbs->source_type = BC_TYPE_EMPTY;
}
/*
* Binary *erts_bin_nrml_alloc(Uint size);
* Binary *erts_bin_realloc(Binary *bp, Uint size);
* void erts_bin_free(Binary *bp);
*/
static BIF_RETTYPE do_binary_copy(Process *p, Eterm bin, Eterm en)
{
Uint n;
byte *bytes;
Uint bit_offs;
Uint bit_size;
size_t size;
Uint reds = get_reds(p, BINARY_COPY_LOOP_FACTOR);
Uint target_size;
byte *t;
Uint pos;
if (is_not_binary(bin)) {
goto badarg;
}
if (!term_to_Uint(en, &n)) {
goto badarg;
}
if (!n) {
Eterm res_term = erts_new_heap_binary(p,NULL,0,&bytes);
BIF_RET(res_term);
}
ERTS_GET_BINARY_BYTES(bin,bytes,bit_offs,bit_size);
if (bit_size != 0) {
goto badarg;
}
size = binary_size(bin);
target_size = size * n;
if ((target_size - size) >= reds) {
Eterm orig;
Uint offset;
Uint bit_offset;
Uint bit_size;
CopyBinState *cbs;
Eterm *hp;
Eterm trap_term;
int i;
/* We will trap, set up the structure for trapping right away */
Binary *mb = erts_create_magic_binary(sizeof(CopyBinState),
cleanup_copy_bin_state);
cbs = ERTS_MAGIC_BIN_DATA(mb);
cbs->temp_alloc = NULL;
cbs->source = NULL;
ERTS_GET_REAL_BIN(bin, orig, offset, bit_offset, bit_size);
if (*(binary_val(orig)) == HEADER_PROC_BIN) {
ProcBin* pb = (ProcBin *) binary_val(orig);
if (pb->flags) {
erts_emasculate_writable_binary(pb);
}
cbs->source =
erts_get_aligned_binary_bytes_extra(bin,
&(cbs->temp_alloc),
ERTS_ALC_T_BINARY_BUFFER,
0);
cbs->source_type = BC_TYPE_ALIGNED;
} else { /* Heap binary */
cbs->source =
erts_get_aligned_binary_bytes_extra(bin,
&(cbs->temp_alloc),
ERTS_ALC_T_BINARY_BUFFER,
0);
if (!(cbs->temp_alloc)) { /* alignment not needed, need to copy */
byte *tmp = erts_alloc(ERTS_ALC_T_BINARY_BUFFER,size);
memcpy(tmp,cbs->source,size);
cbs->source = tmp;
cbs->source_type = BC_TYPE_HEAP;
} else {
cbs->source_type = BC_TYPE_ALIGNED;
}
}
cbs->result = erts_bin_nrml_alloc(target_size); /* Always offheap
if trapping */
cbs->result->flags = 0;
cbs->result->orig_size = target_size;
erts_refc_init(&(cbs->result->refc), 1);
t = (byte *) cbs->result->orig_bytes; /* No offset or anything */
pos = 0;
i = 0;
while (pos < reds) {
memcpy(t+pos,cbs->source, size);
pos += size;
++i;
}
cbs->source_size = size;
cbs->result_pos = pos;
cbs->times_left = n-i;
hp = HAlloc(p,PROC_BIN_SIZE);
trap_term = erts_mk_magic_binary_term(&hp, &MSO(p), mb);
BUMP_ALL_REDS(p);
BIF_TRAP2(&binary_copy_trap_export, p, bin, trap_term);
} else {
Eterm res_term;
byte *temp_alloc = NULL;
byte *source =
erts_get_aligned_binary_bytes(bin,
&temp_alloc);
if (target_size <= ERL_ONHEAP_BIN_LIMIT) {
res_term = erts_new_heap_binary(p,NULL,target_size,&t);
} else {
res_term = erts_new_mso_binary(p,NULL,target_size);
t = ((ProcBin *) binary_val(res_term))->bytes;
}
pos = 0;
while (pos < target_size) {
memcpy(t+pos,source, size);
pos += size;
}
erts_free_aligned_binary_bytes(temp_alloc);
BUMP_REDS(p,pos / BINARY_COPY_LOOP_FACTOR);
BIF_RET(res_term);
}
badarg:
BIF_ERROR(p,BADARG);
}
BIF_RETTYPE binary_copy_trap(BIF_ALIST_2)
{
Uint n;
size_t size;
Uint reds = get_reds(BIF_P, BINARY_COPY_LOOP_FACTOR);
byte *t;
Uint pos;
Binary *mb = ((ProcBin *) binary_val(BIF_ARG_2))->val;
CopyBinState *cbs = (CopyBinState *) ERTS_MAGIC_BIN_DATA(mb);
Uint opos;
/* swapout... */
n = cbs->times_left;
size = cbs->source_size;
opos = pos = cbs->result_pos;
t = (byte *) cbs->result->orig_bytes; /* "well behaved" binary */
if ((n-1) * size >= reds) {
Uint i = 0;
while ((pos - opos) < reds) {
memcpy(t+pos,cbs->source, size);
pos += size;
++i;
}
cbs->result_pos = pos;
cbs->times_left -= i;
BUMP_ALL_REDS(BIF_P);
BIF_TRAP2(&binary_copy_trap_export, BIF_P, BIF_ARG_1, BIF_ARG_2);
} else {
Binary *save;
ProcBin* pb;
Uint target_size = cbs->result->orig_size;
while (pos < target_size) {
memcpy(t+pos,cbs->source, size);
pos += size;
}
save = cbs->result;
cbs->result = NULL;
cleanup_copy_bin_state(mb); /* now cbs is dead */
pb = (ProcBin *) HAlloc(BIF_P, PROC_BIN_SIZE);
pb->thing_word = HEADER_PROC_BIN;
pb->size = target_size;
pb->next = MSO(BIF_P).mso;
MSO(BIF_P).mso = pb;
pb->val = save;
pb->bytes = t;
pb->flags = 0;
MSO(BIF_P).overhead += target_size / sizeof(Eterm);
BUMP_REDS(BIF_P,(pos - opos) / BINARY_COPY_LOOP_FACTOR);
BIF_RET(make_binary(pb));
}
}
BIF_RETTYPE binary_copy_1(BIF_ALIST_1)
{
return do_binary_copy(BIF_P,BIF_ARG_1,make_small(1));
}
BIF_RETTYPE binary_copy_2(BIF_ALIST_2)
{
return do_binary_copy(BIF_P,BIF_ARG_1,BIF_ARG_2);
}
BIF_RETTYPE binary_referenced_byte_size_1(BIF_ALIST_1)
{
ErlSubBin *sb;
ProcBin *pb;
Eterm res;
Eterm bin = BIF_ARG_1;
if (is_not_binary(BIF_ARG_1)) {
BIF_ERROR(BIF_P,BADARG);
}
sb = (ErlSubBin *) binary_val(bin);
if (sb->thing_word == HEADER_SUB_BIN) {
bin = sb->orig;
}
pb = (ProcBin *) binary_val(bin);
if (pb->thing_word == HEADER_PROC_BIN) {
res = erts_make_integer((Uint) pb->val->orig_size, BIF_P); /* XXX:PaN Halfword? orig_size is a long */
} else { /* heap binary */
res = erts_make_integer((Uint) ((ErlHeapBin *) pb)->size, BIF_P);
}
BIF_RET(res);
}
#define END_BIG 0
#define END_SMALL 1
#ifdef WORDS_BIGENDIAN
#define END_NATIVE END_BIG
#else
#define END_NATIVE END_SMALL
#endif
static int get_need(Uint u) {
#if defined(ARCH_64) && !HALFWORD_HEAP
if (u > 0xFFFFFFFFUL) {
if (u > 0xFFFFFFFFFFFFUL) {
if (u > 0xFFFFFFFFFFFFFFUL) {
return 8;
}
return 7;
}
if (u > 0xFFFFFFFFFFUL) {
return 6;
}
return 5;
}
#endif
if (u > 0xFFFFUL) {
if (u > 0xFFFFFFUL) {
return 4;
}
return 3;
}
if (u > 0xFFUL) {
return 2;
}
return 1;
}
static BIF_RETTYPE do_encode_unsigned(Process *p, Eterm uns, Eterm endianess)
{
Eterm res;
if ((is_not_small(uns) && is_not_big(uns)) || is_not_atom(endianess) ||
(endianess != am_big && endianess != am_little)) {
goto badarg;
}
if (is_small(uns)) {
Sint x = signed_val(uns);
Uint u;
int n,i;
byte *b;
if (x < 0) {
goto badarg;
}
u = (Uint) x;
n = get_need(u);
ASSERT(n <= ERL_ONHEAP_BIN_LIMIT);
res = erts_new_heap_binary(p, NULL, n, &b);
if (endianess == am_big) {
for(i=n-1;i>=0;--i) {
b[i] = u & 0xFF;
u >>= 8;
}
} else {
for(i=0;i<n;++i) {
b[i] = u & 0xFF;
u >>= 8;
}
}
BIF_RET(res);
} else {
/* Big */
Eterm *bigp = big_val(uns);
Uint n;
dsize_t num_parts = BIG_SIZE(bigp);
Eterm res;
byte *b;
ErtsDigit d;
if(BIG_SIGN(bigp)) {
goto badarg;
}
n = (num_parts-1)*sizeof(ErtsDigit)+get_need(BIG_DIGIT(bigp,(num_parts-1)));
if (n <= ERL_ONHEAP_BIN_LIMIT) {
res = erts_new_heap_binary(p,NULL,n,&b);
} else {
res = erts_new_mso_binary(p,NULL,n);
b = ((ProcBin *) binary_val(res))->bytes;
}
if (endianess == am_big) {
Sint i,j;
j = 0;
d = BIG_DIGIT(bigp,0);
for (i=n-1;i>=0;--i) {
b[i] = d & 0xFF;
if (!((++j) % sizeof(ErtsDigit))) {
d = BIG_DIGIT(bigp,j / sizeof(ErtsDigit));
} else {
d >>= 8;
}
}
} else {
Sint i,j;
j = 0;
d = BIG_DIGIT(bigp,0);
for (i=0;i<n;++i) {
b[i] = d & 0xFF;
if (!((++j) % sizeof(ErtsDigit))) {
d = BIG_DIGIT(bigp,j / sizeof(ErtsDigit));
} else {
d >>= 8;
}
}
}
BIF_RET(res);
}
badarg:
BIF_ERROR(p,BADARG);
}
static BIF_RETTYPE do_decode_unsigned(Process *p, Eterm uns, Eterm endianess)
{
byte *bytes;
Uint bitoffs, bitsize;
Uint size;
Eterm res;
if (is_not_binary(uns) || is_not_atom(endianess) ||
(endianess != am_big && endianess != am_little)) {
goto badarg;
}
ERTS_GET_BINARY_BYTES(uns, bytes, bitoffs, bitsize);
if (bitsize != 0) {
goto badarg;
}
/* align while rolling */
size = binary_size(uns);
if (bitoffs) {
if (endianess == am_big) {
while (size && (((((Uint) bytes[0]) << bitoffs) |
(((Uint) bytes[1]) >> (8-bitoffs))) & 0xFF) == 0) {
++bytes;
--size;
}
} else {
while(size &&
(((((Uint) bytes[size-1]) << bitoffs) |
(((Uint) bytes[size]) >> (8-bitoffs))) & 0xFF) == 0) {
--size;
}
}
} else {
if (endianess == am_big) {
while (size && *bytes == 0) {
++bytes;
--size;
}
} else {
while(size && bytes[size-1] == 0) {
--size;
}
}
}
if (!size) {
BIF_RET(make_small(0));
}
if (size <= sizeof(Uint)) {
Uint u = 0;
Sint i;
if (endianess == am_big) {
if (bitoffs) {
for(i=0;i<size;++i) {
u <<=8;
u |= (((((Uint) bytes[i]) << bitoffs) |
(((Uint) bytes[i+1]) >> (8-bitoffs))) & 0xFF);
}
} else {
for(i=0;i<size;++i) {
u <<=8;
u |= bytes[i];
}
}
} else {
if (bitoffs) {
for(i=size-1;i>=0;--i) {
u <<=8;
u |= (((((Uint) bytes[i]) << bitoffs) |
(((Uint) bytes[i+1]) >> (8-bitoffs))) & 0xFF);
}
} else {
for(i=size-1;i>=0;--i) {
u <<=8;
u |= bytes[i];
}
}
}
res = erts_make_integer(u,p);
BIF_RET(res);
} else {
/* Assume big, as we stripped away all zeroes from the MSB part of the binary */
dsize_t num_parts = size / sizeof(ErtsDigit) + !!(size % sizeof(ErtsDigit));
Eterm *bigp;
bigp = HAlloc(p, BIG_NEED_SIZE(num_parts));
*bigp = make_pos_bignum_header(num_parts);
res = make_big(bigp);
if (endianess == am_big) {
Sint i,j;
ErtsDigit *d;
j = size;
d = &(BIG_DIGIT(bigp,num_parts - 1));
*d = 0;
i = 0;
if(bitoffs) {
for (;;){
(*d) <<= 8;
(*d) |= (((((Uint) bytes[i]) << bitoffs) |
(((Uint) bytes[i+1]) >> (8-bitoffs))) & 0xFF);
if (++i >= size) {
break;
}
if (!(--j % sizeof(ErtsDigit))) {
--d;
*d = 0;
}
}
} else {
for (;;){
(*d) <<= 8;
(*d) |= bytes[i];
if (++i >= size) {
break;
}
if (!(--j % sizeof(ErtsDigit))) {
--d;
*d = 0;
}
}
}
} else {
Sint i,j;
ErtsDigit *d;
j = size;
d = &(BIG_DIGIT(bigp,num_parts - 1));
*d = 0;
i = size-1;
if (bitoffs) {
for (;;){
(*d) <<= 8;
(*d) |= (((((Uint) bytes[i]) << bitoffs) |
(((Uint) bytes[i+1]) >> (8-bitoffs))) & 0xFF);
if (--i < 0) {
break;
}
if (!(--j % sizeof(ErtsDigit))) {
--d;
*d = 0;
}
}
} else {
for (;;){
(*d) <<= 8;
(*d) |= bytes[i];
if (--i < 0) {
break;
}
if (!(--j % sizeof(ErtsDigit))) {
--d;
*d = 0;
}
}
}
}
BIF_RET(res);
}
badarg:
BIF_ERROR(p,BADARG);
}
BIF_RETTYPE binary_encode_unsigned_1(BIF_ALIST_1)
{
return do_encode_unsigned(BIF_P,BIF_ARG_1,am_big);
}
BIF_RETTYPE binary_encode_unsigned_2(BIF_ALIST_2)
{
return do_encode_unsigned(BIF_P,BIF_ARG_1,BIF_ARG_2);
}
BIF_RETTYPE binary_decode_unsigned_1(BIF_ALIST_1)
{
return do_decode_unsigned(BIF_P,BIF_ARG_1,am_big);
}
BIF_RETTYPE binary_decode_unsigned_2(BIF_ALIST_2)
{
return do_decode_unsigned(BIF_P,BIF_ARG_1,BIF_ARG_2);
}
/*
* Hard debug functions (dump) for the search structures
*/
#ifdef HARDDEBUG
static void dump_bm_data(BMData *bm)
{
int i,j;
erts_printf("Dumping Boyer-More structure.\n");
erts_printf("=============================\n");
erts_printf("Searchstring [%ld]:\n", bm->len);
erts_printf("<<");
for (i = 0; i < bm->len; ++i) {
if (i > 0) {
erts_printf(", ");
}
erts_printf("%d", (int) bm->x[i]);
if (bm->x[i] >= 'A') {
erts_printf(" ($%c)",(char) bm->x[i]);
}
}
erts_printf(">>\n");
erts_printf("GoodShift array:\n");
for (i = 0; i < bm->len; ++i) {
erts_printf("GoodShift[%d]: %ld\n", i, bm->goodshift[i]);
}
erts_printf("BadShift array:\n");
j = 0;
for (i = 0; i < ALPHABET_SIZE; i += j) {
for (j = 0; i + j < ALPHABET_SIZE && j < 6; ++j) {
erts_printf("BS[%03d]:%02ld, ", i+j, bm->badshift[i+j]);
}
erts_printf("\n");
}
}
static void dump_ac_node(ACNode *node, int indent, int ch) {
int i;
char *spaces = erts_alloc(ERTS_ALC_T_TMP, 10 * indent + 1);
memset(spaces,' ',10*indent);
spaces[10*indent] = '\0';
erts_printf("%s-> %c\n",spaces,ch);
erts_printf("%sId: %u\n",spaces,(unsigned) node->id);
erts_printf("%sD: %u\n",spaces,(unsigned)node->d);
erts_printf("%sFinal: %d\n",spaces,(int)node->final);
erts_printf("%sFail: %u\n",spaces,(unsigned)node->h->id);
erts_free(ERTS_ALC_T_TMP,spaces);
for(i=0;i<ALPHABET_SIZE;++i) {
if (node->g[i] != NULL && node->g[i] != node) {
dump_ac_node(node->g[i],indent+1,i);
}
}
}
static void dump_ac_trie(ACTrie *act)
{
erts_printf("Aho Corasick Trie dump.\n");
erts_printf("=======================\n");
erts_printf("Node counter: %u\n", (unsigned) act->idc);
erts_printf("Searchstring counter: %u\n", (unsigned) act->counter);
erts_printf("Trie:\n");
dump_ac_node(act->root, 0, '0');
return;
}
#endif
