/*
* %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%
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#define ERTS_DO_INCL_GLB_INLINE_FUNC_DEF
#include "sys.h"
#include "erl_vm.h"
#include "global.h"
#include "erl_process.h"
#include "big.h"
#include "bif.h"
#include "erl_binary.h"
#include "erl_bits.h"
#include "packet_parser.h"
#include "erl_gc.h"
#define ERTS_WANT_DB_INTERNAL__
#include "erl_db.h"
#include "erl_threads.h"
#include "register.h"
#include "dist.h"
#include "erl_printf.h"
#include "erl_threads.h"
#include "erl_smp.h"
#include "erl_time.h"
#undef M_TRIM_THRESHOLD
#undef M_TOP_PAD
#undef M_MMAP_THRESHOLD
#undef M_MMAP_MAX
#if !defined(ELIB_ALLOC_IS_CLIB) && defined(__GLIBC__) && defined(HAVE_MALLOC_H)
#include <malloc.h>
#endif
#if defined(ELIB_ALLOC_IS_CLIB) || !defined(HAVE_MALLOPT)
#undef HAVE_MALLOPT
#define HAVE_MALLOPT 0
#endif
/* profile_scheduler mini message queue */
#ifdef ERTS_TIMER_THREAD
/* A timer thread is not welcomed with this lock violation work around.
* - Bj�rn-Egil
*/
#error Timer thread may not be enabled due to lock violation.
#endif
typedef struct {
Uint scheduler_id;
Uint no_schedulers;
Uint Ms;
Uint s;
Uint us;
Eterm state;
} profile_sched_msg;
typedef struct {
profile_sched_msg msg[2];
Uint n;
} profile_sched_msg_q;
#ifdef ERTS_SMP
static void
dispatch_profile_msg_q(profile_sched_msg_q *psmq)
{
int i = 0;
profile_sched_msg *msg = NULL;
ASSERT(psmq != NULL);
for (i = 0; i < psmq->n; i++) {
msg = &(psmq->msg[i]);
profile_scheduler_q(make_small(msg->scheduler_id), msg->state, am_undefined, msg->Ms, msg->s, msg->us);
}
}
#endif
Eterm*
erts_heap_alloc(Process* p, Uint need)
{
ErlHeapFragment* bp;
Eterm* htop;
Uint n;
#if defined(DEBUG) || defined(CHECK_FOR_HOLES)
Uint i;
#endif
#ifdef FORCE_HEAP_FRAGS
if (p->space_verified && p->space_verified_from!=NULL
&& HEAP_TOP(p) >= p->space_verified_from
&& HEAP_TOP(p) + need <= p->space_verified_from + p->space_verified
&& HEAP_LIMIT(p) - HEAP_TOP(p) >= need) {
Uint consumed = need + (HEAP_TOP(p) - p->space_verified_from);
ASSERT(consumed <= p->space_verified);
p->space_verified -= consumed;
p->space_verified_from += consumed;
HEAP_TOP(p) = p->space_verified_from;
return HEAP_TOP(p) - need;
}
p->space_verified = 0;
p->space_verified_from = NULL;
#endif /* FORCE_HEAP_FRAGS */
n = need;
bp = MBUF(p);
if (bp != NULL && need <= (bp->alloc_size - bp->used_size)) {
Eterm* ret = bp->mem + bp->used_size;
bp->used_size += need;
return ret;
}
#ifdef DEBUG
n++;
#endif
bp = (ErlHeapFragment*)
ERTS_HEAP_ALLOC(ERTS_ALC_T_HEAP_FRAG, ERTS_HEAP_FRAG_SIZE(n));
#if defined(DEBUG) || defined(CHECK_FOR_HOLES)
for (i = 0; i < n; i++) {
bp->mem[i] = ERTS_HOLE_MARKER;
}
#endif
#ifdef DEBUG
n--;
#endif
/*
* When we have created a heap fragment, we are no longer allowed
* to store anything more on the heap.
*/
htop = HEAP_TOP(p);
if (htop < HEAP_LIMIT(p)) {
*htop = make_pos_bignum_header(HEAP_LIMIT(p)-htop-1);
HEAP_TOP(p) = HEAP_LIMIT(p);
}
bp->next = MBUF(p);
MBUF(p) = bp;
bp->alloc_size = n;
bp->used_size = n;
MBUF_SIZE(p) += n;
bp->off_heap.mso = NULL;
#ifndef HYBRID /* FIND ME! */
bp->off_heap.funs = NULL;
#endif
bp->off_heap.externals = NULL;
bp->off_heap.overhead = 0;
return bp->mem;
}
#ifdef CHECK_FOR_HOLES
Eterm*
erts_set_hole_marker(Eterm* ptr, Uint sz)
{
Eterm* p = ptr;
int i;
for (i = 0; i < sz; i++) {
*p++ = ERTS_HOLE_MARKER;
}
return ptr;
}
#endif
/*
* Helper function for the ESTACK macros defined in global.h.
*/
void
erl_grow_stack(Eterm** start, Eterm** sp, Eterm** end)
{
Uint old_size = (*end - *start);
Uint new_size = old_size * 2;
Uint sp_offs = *sp - *start;
if (new_size > 2 * DEF_ESTACK_SIZE) {
*start = erts_realloc(ERTS_ALC_T_ESTACK, (void *) *start, new_size*sizeof(Eterm));
} else {
Eterm* new_ptr = erts_alloc(ERTS_ALC_T_ESTACK, new_size*sizeof(Eterm));
sys_memcpy(new_ptr, *start, old_size*sizeof(Eterm));
*start = new_ptr;
}
*end = *start + new_size;
*sp = *start + sp_offs;
}
/*
* Helper function for the ESTACK macros defined in global.h.
*/
void
erl_grow_wstack(UWord** start, UWord** sp, UWord** end)
{
Uint old_size = (*end - *start);
Uint new_size = old_size * 2;
Uint sp_offs = *sp - *start;
if (new_size > 2 * DEF_ESTACK_SIZE) {
*start = erts_realloc(ERTS_ALC_T_ESTACK, (void *) *start, new_size*sizeof(UWord));
} else {
UWord* new_ptr = erts_alloc(ERTS_ALC_T_ESTACK, new_size*sizeof(UWord));
sys_memcpy(new_ptr, *start, old_size*sizeof(UWord));
*start = new_ptr;
}
*end = *start + new_size;
*sp = *start + sp_offs;
}
/* CTYPE macros */
#define LATIN1
#define IS_DIGIT(c) ((c) >= '0' && (c) <= '9')
#ifdef LATIN1
#define IS_LOWER(c) (((c) >= 'a' && (c) <= 'z') \
|| ((c) >= 128+95 && (c) <= 255 && (c) != 247))
#define IS_UPPER(c) (((c) >= 'A' && (c) <= 'Z') \
|| ((c) >= 128+64 && (c) <= 128+94 && (c) != 247-32))
#else
#define IS_LOWER(c) ((c) >= 'a' && (c) <= 'z')
#define IS_UPPER(c) ((c) >= 'A' && (c) <= 'Z')
#endif
#define IS_ALNUM(c) (IS_DIGIT(c) || IS_LOWER(c) || IS_UPPER(c))
/* We don't include 160 (non-breaking space). */
#define IS_SPACE(c) (c == ' ' || c == '\n' || c == '\t' || c == '\r')
#ifdef LATIN1
#define IS_CNTRL(c) ((c) < ' ' || (c) == 127 \
|| ((c) >= 128 && (c) < 128+32))
#else
/* Treat all non-ASCII as control characters */
#define IS_CNTRL(c) ((c) < ' ' || (c) >= 127)
#endif
#define IS_PRINT(c) (!IS_CNTRL(c))
/*
* Calculate length of a list.
* Returns -1 if not a proper list (i.e. not terminated with NIL)
*/
int
list_length(Eterm list)
{
int i = 0;
while(is_list(list)) {
i++;
list = CDR(list_val(list));
}
if (is_not_nil(list)) {
return -1;
}
return i;
}
Uint erts_fit_in_bits(Uint n)
{
Uint i;
i = 0;
while (n > 0) {
i++;
n >>= 1;
}
return i;
}
int
erts_print(int to, void *arg, char *format, ...)
{
int res;
va_list arg_list;
va_start(arg_list, format);
if (to < ERTS_PRINT_MIN)
res = -EINVAL;
else {
switch (to) {
case ERTS_PRINT_STDOUT:
res = erts_vprintf(format, arg_list);
break;
case ERTS_PRINT_STDERR:
res = erts_vfprintf(stderr, format, arg_list);
break;
case ERTS_PRINT_FILE:
res = erts_vfprintf((FILE *) arg, format, arg_list);
break;
case ERTS_PRINT_SBUF:
res = erts_vsprintf((char *) arg, format, arg_list);
break;
case ERTS_PRINT_SNBUF:
res = erts_vsnprintf(((erts_print_sn_buf *) arg)->buf,
((erts_print_sn_buf *) arg)->size,
format,
arg_list);
break;
case ERTS_PRINT_DSBUF:
res = erts_vdsprintf((erts_dsprintf_buf_t *) arg, format, arg_list);
break;
case ERTS_PRINT_INVALID:
res = -EINVAL;
break;
default:
res = erts_vfdprintf((int) to, format, arg_list);
break;
}
}
va_end(arg_list);
return res;
}
int
erts_putc(int to, void *arg, char c)
{
return erts_print(to, arg, "%c", c);
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\
* Some Erlang term building utility functions (to be used when performance *
* isn't critical). *
* *
* Add more functions like these here (and function prototypes in global.h) *
* when needed. *
* *
\* */
Eterm
erts_bld_atom(Uint **hpp, Uint *szp, char *str)
{
if (hpp)
return am_atom_put(str, sys_strlen(str));
else
return THE_NON_VALUE;
}
Eterm
erts_bld_uint(Uint **hpp, Uint *szp, Uint ui)
{
Eterm res = THE_NON_VALUE;
if (IS_USMALL(0, ui)) {
if (hpp)
res = make_small(ui);
}
else {
if (szp)
*szp += BIG_UINT_HEAP_SIZE;
if (hpp) {
res = uint_to_big(ui, *hpp);
*hpp += BIG_UINT_HEAP_SIZE;
}
}
return res;
}
/*
* Erts_bld_uword is more or less similar to erts_bld_uint, but a pointer
* can safely be passed.
*/
Eterm
erts_bld_uword(Uint **hpp, Uint *szp, UWord uw)
{
Eterm res = THE_NON_VALUE;
if (IS_USMALL(0, uw)) {
if (hpp)
res = make_small((Uint) uw);
}
else {
if (szp)
*szp += BIG_UWORD_HEAP_SIZE(uw);
if (hpp) {
res = uword_to_big(uw, *hpp);
*hpp += BIG_UWORD_HEAP_SIZE(uw);
}
}
return res;
}
Eterm
erts_bld_uint64(Uint **hpp, Uint *szp, Uint64 ui64)
{
Eterm res = THE_NON_VALUE;
if (IS_USMALL(0, ui64)) {
if (hpp)
res = make_small((Uint) ui64);
}
else {
if (szp)
*szp = ERTS_UINT64_HEAP_SIZE(ui64);
if (hpp)
res = erts_uint64_to_big(ui64, hpp);
}
return res;
}
Eterm
erts_bld_sint64(Uint **hpp, Uint *szp, Sint64 si64)
{
Eterm res = THE_NON_VALUE;
if (IS_SSMALL(si64)) {
if (hpp)
res = make_small((Sint) si64);
}
else {
if (szp)
*szp = ERTS_SINT64_HEAP_SIZE(si64);
if (hpp)
res = erts_sint64_to_big(si64, hpp);
}
return res;
}
Eterm
erts_bld_cons(Uint **hpp, Uint *szp, Eterm car, Eterm cdr)
{
Eterm res = THE_NON_VALUE;
if (szp)
*szp += 2;
if (hpp) {
res = CONS(*hpp, car, cdr);
*hpp += 2;
}
return res;
}
Eterm
erts_bld_tuple(Uint **hpp, Uint *szp, Uint arity, ...)
{
Eterm res = THE_NON_VALUE;
ASSERT(arity < (((Uint)1) << (sizeof(Uint)*8 - _HEADER_ARITY_OFFS)));
if (szp)
*szp += arity + 1;
if (hpp) {
res = make_tuple(*hpp);
*((*hpp)++) = make_arityval(arity);
if (arity > 0) {
Uint i;
va_list argp;
va_start(argp, arity);
for (i = 0; i < arity; i++) {
*((*hpp)++) = va_arg(argp, Eterm);
}
va_end(argp);
}
}
return res;
}
Eterm erts_bld_tuplev(Uint **hpp, Uint *szp, Uint arity, Eterm terms[])
{
Eterm res = THE_NON_VALUE;
/*
* Note callers expect that 'terms' is *not* accessed if hpp == NULL.
*/
ASSERT(arity < (((Uint)1) << (sizeof(Uint)*8 - _HEADER_ARITY_OFFS)));
if (szp)
*szp += arity + 1;
if (hpp) {
res = make_tuple(*hpp);
*((*hpp)++) = make_arityval(arity);
if (arity > 0) {
Uint i;
for (i = 0; i < arity; i++)
*((*hpp)++) = terms[i];
}
}
return res;
}
Eterm
erts_bld_string_n(Uint **hpp, Uint *szp, const char *str, Sint len)
{
Eterm res = THE_NON_VALUE;
Sint i = len;
if (szp)
*szp += len*2;
if (hpp) {
res = NIL;
while (--i >= 0) {
res = CONS(*hpp, make_small((byte) str[i]), res);
*hpp += 2;
}
}
return res;
}
Eterm
erts_bld_list(Uint **hpp, Uint *szp, Sint length, Eterm terms[])
{
Eterm list = THE_NON_VALUE;
if (szp)
*szp += 2*length;
if (hpp) {
Sint i = length;
list = NIL;
while (--i >= 0) {
list = CONS(*hpp, terms[i], list);
*hpp += 2;
}
}
return list;
}
Eterm
erts_bld_2tup_list(Uint **hpp, Uint *szp,
Sint length, Eterm terms1[], Uint terms2[])
{
Eterm res = THE_NON_VALUE;
if (szp)
*szp += 5*length;
if (hpp) {
Sint i = length;
res = NIL;
while (--i >= 0) {
res = CONS(*hpp+3, TUPLE2(*hpp, terms1[i], terms2[i]), res);
*hpp += 5;
}
}
return res;
}
Eterm
erts_bld_atom_uint_2tup_list(Uint **hpp, Uint *szp,
Sint length, Eterm atoms[], Uint uints[])
{
Sint i;
Eterm res = THE_NON_VALUE;
if (szp) {
*szp += 5*length;
i = length;
while (--i >= 0) {
if (!IS_USMALL(0, uints[i]))
*szp += BIG_UINT_HEAP_SIZE;
}
}
if (hpp) {
i = length;
res = NIL;
while (--i >= 0) {
Eterm ui;
if (IS_USMALL(0, uints[i]))
ui = make_small(uints[i]);
else {
ui = uint_to_big(uints[i], *hpp);
*hpp += BIG_UINT_HEAP_SIZE;
}
res = CONS(*hpp+3, TUPLE2(*hpp, atoms[i], ui), res);
*hpp += 5;
}
}
return res;
}
Eterm
erts_bld_atom_2uint_3tup_list(Uint **hpp, Uint *szp, Sint length,
Eterm atoms[], Uint uints1[], Uint uints2[])
{
Sint i;
Eterm res = THE_NON_VALUE;
if (szp) {
*szp += 6*length;
i = length;
while (--i >= 0) {
if (!IS_USMALL(0, uints1[i]))
*szp += BIG_UINT_HEAP_SIZE;
if (!IS_USMALL(0, uints2[i]))
*szp += BIG_UINT_HEAP_SIZE;
}
}
if (hpp) {
i = length;
res = NIL;
while (--i >= 0) {
Eterm ui1;
Eterm ui2;
if (IS_USMALL(0, uints1[i]))
ui1 = make_small(uints1[i]);
else {
ui1 = uint_to_big(uints1[i], *hpp);
*hpp += BIG_UINT_HEAP_SIZE;
}
if (IS_USMALL(0, uints2[i]))
ui2 = make_small(uints2[i]);
else {
ui2 = uint_to_big(uints2[i], *hpp);
*hpp += BIG_UINT_HEAP_SIZE;
}
res = CONS(*hpp+4, TUPLE3(*hpp, atoms[i], ui1, ui2), res);
*hpp += 6;
}
}
return res;
}
/* *\
* *
\* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* make a hash index from an erlang term */
/*
** There are three hash functions.
** make_broken_hash: the one used for backward compatibility
** is called from the bif erlang:hash/2. Should never be used
** as it a) hashes only a part of binaries, b) hashes bignums really poorly,
** c) hashes bignums differently on different endian processors and d) hashes
** small integers with different weights on different bytes.
**
** make_hash: A hash function that will give the same values for the same
** terms regardless of the internal representation. Small integers are
** hashed using the same algorithm as bignums and bignums are hashed
** independent of the CPU endianess.
** Make_hash also hashes pids, ports and references like 32 bit numbers
** (but with different constants).
** make_hash() is called from the bif erlang:phash/2
**
** The idea behind the hash algorithm is to produce values suitable for
** linear dynamic hashing. We cannot choose the range at all while hashing
** (it's not even supplied to the hashing functions). The good old algorithm
** [H = H*C+X mod M, where H is the hash value, C is a "random" constant(or M),
** M is the range, preferably a prime, and X is each byte value] is therefore
** modified to:
** H = H*C+X mod 2^32, where C is a large prime. This gives acceptable
** "spreading" of the hashes, so that later modulo calculations also will give
** acceptable "spreading" in the range.
** We really need to hash on bytes, otherwise the
** upper bytes of a word will be less significant than the lower ones. That's
** not acceptable at all. For internal use one could maybe optimize by using
** another hash function, that is less strict but faster. That is, however, not
** implemented.
**
** Short semi-formal description of make_hash:
**
** In make_hash, the number N is treated like this:
** Abs(N) is hashed bytewise with the least significant byte, B(0), first.
** The number of bytes (J) to calculate hash on in N is
** (the number of _32_ bit words needed to store the unsigned
** value of abs(N)) * 4.
** X = FUNNY_NUMBER2
** If N < 0, Y = FUNNY_NUMBER4 else Y = FUNNY_NUMBER3.
** The hash value is Y*h(J) mod 2^32 where h(J) is calculated like
** h(0) = <initial hash>
** h(i) = h(i-i)*X + B(i-1)
** The above should hold regardless of internal representation.
** Pids are hashed like small numbers but with differrent constants, as are
** ports.
** References are hashed like ports but only on the least significant byte.
** Binaries are hashed on all bytes (not on the 15 first as in
** make_broken_hash()).
** Bytes in lists (possibly text strings) use a simpler multiplication inlined
** in the handling of lists, that is an optimization.
** Everything else is like in the old hash (make_broken_hash()).
**
** make_hash2() is faster than make_hash, in particular for bignums
** and binaries, and produces better hash values.
*/
/* some prime numbers just above 2 ^ 28 */
#define FUNNY_NUMBER1 268440163
#define FUNNY_NUMBER2 268439161
#define FUNNY_NUMBER3 268435459
#define FUNNY_NUMBER4 268436141
#define FUNNY_NUMBER5 268438633
#define FUNNY_NUMBER6 268437017
#define FUNNY_NUMBER7 268438039
#define FUNNY_NUMBER8 268437511
#define FUNNY_NUMBER9 268439627
#define FUNNY_NUMBER10 268440479
#define FUNNY_NUMBER11 268440577
#define FUNNY_NUMBER12 268440581
static Uint32
hash_binary_bytes(Eterm bin, Uint sz, Uint32 hash)
{
byte* ptr;
Uint bitoffs;
Uint bitsize;
ERTS_GET_BINARY_BYTES(bin, ptr, bitoffs, bitsize);
if (bitoffs == 0) {
while (sz--) {
hash = hash*FUNNY_NUMBER1 + *ptr++;
}
if (bitsize > 0) {
byte b = *ptr;
b >>= 8 - bitsize;
hash = (hash*FUNNY_NUMBER1 + b) * FUNNY_NUMBER12 + bitsize;
}
} else {
Uint previous = *ptr++;
Uint b;
Uint lshift = bitoffs;
Uint rshift = 8 - lshift;
while (sz--) {
b = (previous << lshift) & 0xFF;
previous = *ptr++;
b |= previous >> rshift;
hash = hash*FUNNY_NUMBER1 + b;
}
if (bitsize > 0) {
b = (previous << lshift) & 0xFF;
previous = *ptr++;
b |= previous >> rshift;
b >>= 8 - bitsize;
hash = (hash*FUNNY_NUMBER1 + b) * FUNNY_NUMBER12 + bitsize;
}
}
return hash;
}
Uint32 make_hash(Eterm term_arg)
{
DECLARE_WSTACK(stack);
Eterm term = term_arg;
Eterm hash = 0;
unsigned op;
/* Must not collide with the real tag_val_def's: */
#define MAKE_HASH_TUPLE_OP 0x10
#define MAKE_HASH_FUN_OP 0x11
#define MAKE_HASH_CDR_PRE_OP 0x12
#define MAKE_HASH_CDR_POST_OP 0x13
/*
** Convenience macro for calculating a bytewise hash on an unsigned 32 bit
** integer.
** If the endianess is known, we could be smarter here,
** but that gives no significant speedup (on a sparc at least)
*/
#define UINT32_HASH_STEP(Expr, Prime1) \
do { \
Uint32 x = (Uint32) (Expr); \
hash = \
(((((hash)*(Prime1) + (x & 0xFF)) * (Prime1) + \
((x >> 8) & 0xFF)) * (Prime1) + \
((x >> 16) & 0xFF)) * (Prime1) + \
(x >> 24)); \
} while(0)
#define UINT32_HASH_RET(Expr, Prime1, Prime2) \
UINT32_HASH_STEP(Expr, Prime1); \
hash = hash * (Prime2); \
break
/*
* Significant additions needed for real 64 bit port with larger fixnums.
*/
/*
* Note, for the simple 64bit port, not utilizing the
* larger word size this function will work without modification.
*/
tail_recur:
op = tag_val_def(term);
for (;;) {
switch (op) {
case NIL_DEF:
hash = hash*FUNNY_NUMBER3 + 1;
break;
case ATOM_DEF:
hash = hash*FUNNY_NUMBER1 +
(atom_tab(atom_val(term))->slot.bucket.hvalue);
break;
case SMALL_DEF:
{
Sint y1 = signed_val(term);
Uint y2 = y1 < 0 ? -(Uint)y1 : y1;
UINT32_HASH_STEP(y2, FUNNY_NUMBER2);
#if defined(ARCH_64) && !HALFWORD_HEAP
if (y2 >> 32)
UINT32_HASH_STEP(y2 >> 32, FUNNY_NUMBER2);
#endif
hash *= (y1 < 0 ? FUNNY_NUMBER4 : FUNNY_NUMBER3);
break;
}
case BINARY_DEF:
{
Uint sz = binary_size(term);
hash = hash_binary_bytes(term, sz, hash);
hash = hash*FUNNY_NUMBER4 + sz;
break;
}
case EXPORT_DEF:
{
Export* ep = *((Export **) (export_val(term) + 1));
hash = hash * FUNNY_NUMBER11 + ep->code[2];
hash = hash*FUNNY_NUMBER1 +
(atom_tab(atom_val(ep->code[0]))->slot.bucket.hvalue);
hash = hash*FUNNY_NUMBER1 +
(atom_tab(atom_val(ep->code[1]))->slot.bucket.hvalue);
break;
}
case FUN_DEF:
{
ErlFunThing* funp = (ErlFunThing *) fun_val(term);
Uint num_free = funp->num_free;
hash = hash * FUNNY_NUMBER10 + num_free;
hash = hash*FUNNY_NUMBER1 +
(atom_tab(atom_val(funp->fe->module))->slot.bucket.hvalue);
hash = hash*FUNNY_NUMBER2 + funp->fe->old_index;
hash = hash*FUNNY_NUMBER2 + funp->fe->old_uniq;
if (num_free > 0) {
if (num_free > 1) {
WSTACK_PUSH3(stack, (UWord) &funp->env[1], (num_free-1), MAKE_HASH_FUN_OP);
}
term = funp->env[0];
goto tail_recur;
}
break;
}
case PID_DEF:
UINT32_HASH_RET(internal_pid_number(term),FUNNY_NUMBER5,FUNNY_NUMBER6);
case EXTERNAL_PID_DEF:
UINT32_HASH_RET(external_pid_number(term),FUNNY_NUMBER5,FUNNY_NUMBER6);
case PORT_DEF:
UINT32_HASH_RET(internal_port_number(term),FUNNY_NUMBER9,FUNNY_NUMBER10);
case EXTERNAL_PORT_DEF:
UINT32_HASH_RET(external_port_number(term),FUNNY_NUMBER9,FUNNY_NUMBER10);
case REF_DEF:
UINT32_HASH_RET(internal_ref_numbers(term)[0],FUNNY_NUMBER9,FUNNY_NUMBER10);
case EXTERNAL_REF_DEF:
UINT32_HASH_RET(external_ref_numbers(term)[0],FUNNY_NUMBER9,FUNNY_NUMBER10);
case FLOAT_DEF:
{
FloatDef ff;
GET_DOUBLE(term, ff);
hash = hash*FUNNY_NUMBER6 + (ff.fw[0] ^ ff.fw[1]);
break;
}
case MAKE_HASH_CDR_PRE_OP:
term = (Eterm) WSTACK_POP(stack);
if (is_not_list(term)) {
WSTACK_PUSH(stack, (UWord) MAKE_HASH_CDR_POST_OP);
goto tail_recur;
}
/* fall through */
case LIST_DEF:
{
Eterm* list = list_val(term);
while(is_byte(*list)) {
/* Optimization for strings.
** Note that this hash is different from a 'small' hash,
** as multiplications on a Sparc is so slow.
*/
hash = hash*FUNNY_NUMBER2 + unsigned_val(*list);
if (is_not_list(CDR(list))) {
WSTACK_PUSH(stack, MAKE_HASH_CDR_POST_OP);
term = CDR(list);
goto tail_recur;
}
list = list_val(CDR(list));
}
WSTACK_PUSH2(stack, CDR(list), MAKE_HASH_CDR_PRE_OP);
term = CAR(list);
goto tail_recur;
}
case MAKE_HASH_CDR_POST_OP:
hash *= FUNNY_NUMBER8;
break;
case BIG_DEF:
/* Note that this is the exact same thing as the hashing of smalls.*/
{
Eterm* ptr = big_val(term);
Uint n = BIG_SIZE(ptr);
Uint k = n-1;
ErtsDigit d;
int is_neg = BIG_SIGN(ptr);
Uint i;
int j;
for (i = 0; i < k; i++) {
d = BIG_DIGIT(ptr, i);
for(j = 0; j < sizeof(ErtsDigit); ++j) {
hash = (hash*FUNNY_NUMBER2) + (d & 0xff);
d >>= 8;
}
}
d = BIG_DIGIT(ptr, k);
k = sizeof(ErtsDigit);
#if defined(ARCH_64) && !HALFWORD_HEAP
if (!(d >> 32))
k /= 2;
#endif
for(j = 0; j < (int)k; ++j) {
hash = (hash*FUNNY_NUMBER2) + (d & 0xff);
d >>= 8;
}
hash *= is_neg ? FUNNY_NUMBER4 : FUNNY_NUMBER3;
break;
}
case TUPLE_DEF:
{
Eterm* ptr = tuple_val(term);
Uint arity = arityval(*ptr);
WSTACK_PUSH3(stack, (UWord) arity, (UWord)(ptr+1), (UWord) arity);
op = MAKE_HASH_TUPLE_OP;
}/*fall through*/
case MAKE_HASH_TUPLE_OP:
case MAKE_HASH_FUN_OP:
{
Uint i = (Uint) WSTACK_POP(stack);
Eterm* ptr = (Eterm*) WSTACK_POP(stack);
if (i != 0) {
term = *ptr;
WSTACK_PUSH3(stack, (UWord)(ptr+1), (UWord) i-1, (UWord) op);
goto tail_recur;
}
if (op == MAKE_HASH_TUPLE_OP) {
Uint32 arity = (Uint32) WSTACK_POP(stack);
hash = hash*FUNNY_NUMBER9 + arity;
}
break;
}
default:
erl_exit(1, "Invalid tag in make_hash(0x%X,0x%X)\n", term, op);
return 0;
}
if (WSTACK_ISEMPTY(stack)) break;
op = WSTACK_POP(stack);
}
DESTROY_WSTACK(stack);
return hash;
#undef UINT32_HASH_STEP
#undef UINT32_HASH_RET
}
/* Hash function suggested by Bob Jenkins. */
#define MIX(a,b,c) \
do { \
a -= b; a -= c; a ^= (c>>13); \
b -= c; b -= a; b ^= (a<<8); \
c -= a; c -= b; c ^= (b>>13); \
a -= b; a -= c; a ^= (c>>12); \
b -= c; b -= a; b ^= (a<<16); \
c -= a; c -= b; c ^= (b>>5); \
a -= b; a -= c; a ^= (c>>3); \
b -= c; b -= a; b ^= (a<<10); \
c -= a; c -= b; c ^= (b>>15); \
} while(0)
#define HCONST 0x9e3779b9UL /* the golden ratio; an arbitrary value */
Uint32
block_hash(byte *k, unsigned length, Uint32 initval)
{
Uint32 a,b,c;
unsigned len;
/* Set up the internal state */
len = length;
a = b = HCONST;
c = initval; /* the previous hash value */
while (len >= 12)
{
a += (k[0] +((Uint32)k[1]<<8) +((Uint32)k[2]<<16) +((Uint32)k[3]<<24));
b += (k[4] +((Uint32)k[5]<<8) +((Uint32)k[6]<<16) +((Uint32)k[7]<<24));
c += (k[8] +((Uint32)k[9]<<8) +((Uint32)k[10]<<16)+((Uint32)k[11]<<24));
MIX(a,b,c);
k += 12; len -= 12;
}
c += length;
switch(len) /* all the case statements fall through */
{
case 11: c+=((Uint32)k[10]<<24);
case 10: c+=((Uint32)k[9]<<16);
case 9 : c+=((Uint32)k[8]<<8);
/* the first byte of c is reserved for the length */
case 8 : b+=((Uint32)k[7]<<24);
case 7 : b+=((Uint32)k[6]<<16);
case 6 : b+=((Uint32)k[5]<<8);
case 5 : b+=k[4];
case 4 : a+=((Uint32)k[3]<<24);
case 3 : a+=((Uint32)k[2]<<16);
case 2 : a+=((Uint32)k[1]<<8);
case 1 : a+=k[0];
/* case 0: nothing left to add */
}
MIX(a,b,c);
return c;
}
Uint32
make_hash2(Eterm term)
{
Uint32 hash;
DeclareTmpHeapNoproc(tmp_big,2);
/* (HCONST * {2, ..., 14}) mod 2^32 */
#define HCONST_2 0x3c6ef372UL
#define HCONST_3 0xdaa66d2bUL
#define HCONST_4 0x78dde6e4UL
#define HCONST_5 0x1715609dUL
#define HCONST_6 0xb54cda56UL
#define HCONST_7 0x5384540fUL
#define HCONST_8 0xf1bbcdc8UL
#define HCONST_9 0x8ff34781UL
#define HCONST_10 0x2e2ac13aUL
#define HCONST_11 0xcc623af3UL
#define HCONST_12 0x6a99b4acUL
#define HCONST_13 0x08d12e65UL
#define HCONST_14 0xa708a81eUL
#define HCONST_15 0x454021d7UL
#define UINT32_HASH_2(Expr1, Expr2, AConst) \
do { \
Uint32 a,b; \
a = AConst + (Uint32) (Expr1); \
b = AConst + (Uint32) (Expr2); \
MIX(a,b,hash); \
} while(0)
#define UINT32_HASH(Expr, AConst) UINT32_HASH_2(Expr, 0, AConst)
#define SINT32_HASH(Expr, AConst) \
do { \
Sint32 y = (Sint32) (Expr); \
if (y < 0) { \
UINT32_HASH(-y, AConst); \
/* Negative numbers are unnecessarily mixed twice. */ \
} \
UINT32_HASH(y, AConst); \
} while(0)
#define IS_SSMALL28(x) (((Uint) (((x) >> (28-1)) + 1)) < 2)
/* Optimization. Simple cases before declaration of estack. */
if (primary_tag(term) == TAG_PRIMARY_IMMED1) {
switch (term & _TAG_IMMED1_MASK) {
case _TAG_IMMED1_IMMED2:
switch (term & _TAG_IMMED2_MASK) {
case _TAG_IMMED2_ATOM:
/* Fast, but the poor hash value should be mixed. */
return atom_tab(atom_val(term))->slot.bucket.hvalue;
}
break;
case _TAG_IMMED1_SMALL:
{
Sint x = signed_val(term);
if (SMALL_BITS > 28 && !IS_SSMALL28(x)) {
term = small_to_big(x, tmp_big);
break;
}
hash = 0;
SINT32_HASH(x, HCONST);
return hash;
}
}
};
{
Eterm tmp;
DECLARE_ESTACK(s);
UseTmpHeapNoproc(2);
hash = 0;
for (;;) {
switch (primary_tag(term)) {
case TAG_PRIMARY_LIST:
{
int c = 0;
Uint32 sh = 0;
Eterm* ptr = list_val(term);
while (is_byte(*ptr)) {
/* Optimization for strings. */
sh = (sh << 8) + unsigned_val(*ptr);
if (c == 3) {
UINT32_HASH(sh, HCONST_4);
c = sh = 0;
} else {
c++;
}
term = CDR(ptr);
if (is_not_list(term))
break;
ptr = list_val(term);
}
if (c > 0)
UINT32_HASH(sh, HCONST_4);
if (is_list(term)) {
term = *ptr;
tmp = *++ptr;
ESTACK_PUSH(s, tmp);
}
}
break;
case TAG_PRIMARY_BOXED:
{
Eterm hdr = *boxed_val(term);
ASSERT(is_header(hdr));
switch (hdr & _TAG_HEADER_MASK) {
case ARITYVAL_SUBTAG:
{
int i;
int arity = header_arity(hdr);
Eterm* elem = tuple_val(term);
UINT32_HASH(arity, HCONST_9);
if (arity == 0) /* Empty tuple */
goto hash2_common;
for (i = arity; i >= 2; i--) {
tmp = elem[i];
ESTACK_PUSH(s, tmp);
}
term = elem[1];
}
break;
case EXPORT_SUBTAG:
{
Export* ep = *((Export **) (export_val(term) + 1));
UINT32_HASH_2
(ep->code[2],
atom_tab(atom_val(ep->code[0]))->slot.bucket.hvalue,
HCONST);
UINT32_HASH
(atom_tab(atom_val(ep->code[1]))->slot.bucket.hvalue,
HCONST_14);
goto hash2_common;
}
case FUN_SUBTAG:
{
ErlFunThing* funp = (ErlFunThing *) fun_val(term);
Uint num_free = funp->num_free;
UINT32_HASH_2
(num_free,
atom_tab(atom_val(funp->fe->module))->slot.bucket.hvalue,
HCONST);
UINT32_HASH_2
(funp->fe->old_index, funp->fe->old_uniq, HCONST);
if (num_free == 0) {
goto hash2_common;
} else {
Eterm* bptr = funp->env + num_free - 1;
while (num_free-- > 1) {
term = *bptr--;
ESTACK_PUSH(s, term);
}
term = *bptr;
}
}
break;
case REFC_BINARY_SUBTAG:
case HEAP_BINARY_SUBTAG:
case SUB_BINARY_SUBTAG:
{
byte* bptr;
unsigned sz = binary_size(term);
Uint32 con = HCONST_13 + hash;
Uint bitoffs;
Uint bitsize;
ERTS_GET_BINARY_BYTES(term, bptr, bitoffs, bitsize);
if (sz == 0 && bitsize == 0) {
hash = con;
} else {
if (bitoffs == 0) {
hash = block_hash(bptr, sz, con);
if (bitsize > 0) {
UINT32_HASH_2(bitsize, (bptr[sz] >> (8 - bitsize)),
HCONST_15);
}
} else {
byte* buf = (byte *) erts_alloc(ERTS_ALC_T_TMP,
sz + (bitsize != 0));
erts_copy_bits(bptr, bitoffs, 1, buf, 0, 1, sz*8+bitsize);
hash = block_hash(buf, sz, con);
if (bitsize > 0) {
UINT32_HASH_2(bitsize, (buf[sz] >> (8 - bitsize)),
HCONST_15);
}
erts_free(ERTS_ALC_T_TMP, (void *) buf);
}
}
goto hash2_common;
}
break;
case POS_BIG_SUBTAG:
case NEG_BIG_SUBTAG:
{
Eterm* ptr = big_val(term);
Uint i = 0;
Uint n = BIG_SIZE(ptr);
Uint32 con = BIG_SIGN(ptr) ? HCONST_10 : HCONST_11;
#if D_EXP == 16
do {
Uint32 x, y;
x = i < n ? BIG_DIGIT(ptr, i++) : 0;
x += (Uint32)(i < n ? BIG_DIGIT(ptr, i++) : 0) << 16;
y = i < n ? BIG_DIGIT(ptr, i++) : 0;
y += (Uint32)(i < n ? BIG_DIGIT(ptr, i++) : 0) << 16;
UINT32_HASH_2(x, y, con);
} while (i < n);
#elif D_EXP == 32
do {
Uint32 x, y;
x = i < n ? BIG_DIGIT(ptr, i++) : 0;
y = i < n ? BIG_DIGIT(ptr, i++) : 0;
UINT32_HASH_2(x, y, con);
} while (i < n);
#elif D_EXP == 64
do {
Uint t;
Uint32 x, y;
t = i < n ? BIG_DIGIT(ptr, i++) : 0;
x = t & 0xffffffff;
y = t >> 32;
UINT32_HASH_2(x, y, con);
} while (i < n);
#else
#error "unsupported D_EXP size"
#endif
goto hash2_common;
}
break;
case REF_SUBTAG:
/* All parts of the ref should be hashed. */
UINT32_HASH(internal_ref_numbers(term)[0], HCONST_7);
goto hash2_common;
break;
case EXTERNAL_REF_SUBTAG:
/* All parts of the ref should be hashed. */
UINT32_HASH(external_ref_numbers(term)[0], HCONST_7);
goto hash2_common;
break;
case EXTERNAL_PID_SUBTAG:
/* Only 15 bits are hashed. */
UINT32_HASH(external_pid_number(term), HCONST_5);
goto hash2_common;
case EXTERNAL_PORT_SUBTAG:
/* Only 15 bits are hashed. */
UINT32_HASH(external_port_number(term), HCONST_6);
goto hash2_common;
case FLOAT_SUBTAG:
{
FloatDef ff;
GET_DOUBLE(term, ff);
#if defined(WORDS_BIGENDIAN)
UINT32_HASH_2(ff.fw[0], ff.fw[1], HCONST_12);
#else
UINT32_HASH_2(ff.fw[1], ff.fw[0], HCONST_12);
#endif
goto hash2_common;
}
break;
default:
erl_exit(1, "Invalid tag in make_hash2(0x%X)\n", term);
}
}
break;
case TAG_PRIMARY_IMMED1:
switch (term & _TAG_IMMED1_MASK) {
case _TAG_IMMED1_PID:
/* Only 15 bits are hashed. */
UINT32_HASH(internal_pid_number(term), HCONST_5);
goto hash2_common;
case _TAG_IMMED1_PORT:
/* Only 15 bits are hashed. */
UINT32_HASH(internal_port_number(term), HCONST_6);
goto hash2_common;
case _TAG_IMMED1_IMMED2:
switch (term & _TAG_IMMED2_MASK) {
case _TAG_IMMED2_ATOM:
if (hash == 0)
/* Fast, but the poor hash value should be mixed. */
hash = atom_tab(atom_val(term))->slot.bucket.hvalue;
else
UINT32_HASH(atom_tab(atom_val(term))->slot.bucket.hvalue,
HCONST_3);
goto hash2_common;
case _TAG_IMMED2_NIL:
if (hash == 0)
hash = 3468870702UL;
else
UINT32_HASH(NIL_DEF, HCONST_2);
goto hash2_common;
default:
erl_exit(1, "Invalid tag in make_hash2(0x%X)\n", term);
}
case _TAG_IMMED1_SMALL:
{
Sint x = signed_val(term);
if (SMALL_BITS > 28 && !IS_SSMALL28(x)) {
term = small_to_big(x, tmp_big);
break;
}
SINT32_HASH(x, HCONST);
goto hash2_common;
}
}
break;
default:
erl_exit(1, "Invalid tag in make_hash2(0x%X)\n", term);
hash2_common:
if (ESTACK_ISEMPTY(s)) {
DESTROY_ESTACK(s);
UnUseTmpHeapNoproc(2);
return hash;
}
term = ESTACK_POP(s);
}
}
}
#undef UINT32_HASH_2
#undef UINT32_HASH
#undef SINT32_HASH
}
#undef HCONST
#undef MIX
Uint32 make_broken_hash(Eterm term)
{
Uint32 hash = 0;
DECLARE_WSTACK(stack);
unsigned op;
tail_recur:
op = tag_val_def(term);
for (;;) {
switch (op) {
case NIL_DEF:
hash = hash*FUNNY_NUMBER3 + 1;
break;
case ATOM_DEF:
hash = hash*FUNNY_NUMBER1 +
(atom_tab(atom_val(term))->slot.bucket.hvalue);
break;
case SMALL_DEF:
#if defined(ARCH_64) && !HALFWORD_HEAP
{
Sint y1 = signed_val(term);
Uint y2 = y1 < 0 ? -(Uint)y1 : y1;
Uint32 y3 = (Uint32) (y2 >> 32);
int arity = 1;
#if defined(WORDS_BIGENDIAN)
if (!IS_SSMALL28(y1))
{ /* like a bignum */
Uint32 y4 = (Uint32) y2;
hash = hash*FUNNY_NUMBER2 + ((y4 << 16) | (y4 >> 16));
if (y3)
{
hash = hash*FUNNY_NUMBER2 + ((y3 << 16) | (y3 >> 16));
arity++;
}
hash = hash * (y1 < 0 ? FUNNY_NUMBER3 : FUNNY_NUMBER2) + arity;
} else {
hash = hash*FUNNY_NUMBER2 + (((Uint) y1) & 0xfffffff);
}
#else
if (!IS_SSMALL28(y1))
{ /* like a bignum */
hash = hash*FUNNY_NUMBER2 + ((Uint32) y2);
if (y3)
{
hash = hash*FUNNY_NUMBER2 + y3;
arity++;
}
hash = hash * (y1 < 0 ? FUNNY_NUMBER3 : FUNNY_NUMBER2) + arity;
} else {
hash = hash*FUNNY_NUMBER2 + (((Uint) y1) & 0xfffffff);
}
#endif
}
#else
hash = hash*FUNNY_NUMBER2 + unsigned_val(term);
#endif
break;
case BINARY_DEF:
{
size_t sz = binary_size(term);
size_t i = (sz < 15) ? sz : 15;
hash = hash_binary_bytes(term, i, hash);
hash = hash*FUNNY_NUMBER4 + sz;
break;
}
case EXPORT_DEF:
{
Export* ep = *((Export **) (export_val(term) + 1));
hash = hash * FUNNY_NUMBER11 + ep->code[2];
hash = hash*FUNNY_NUMBER1 +
(atom_tab(atom_val(ep->code[0]))->slot.bucket.hvalue);
hash = hash*FUNNY_NUMBER1 +
(atom_tab(atom_val(ep->code[1]))->slot.bucket.hvalue);
break;
}
case FUN_DEF:
{
ErlFunThing* funp = (ErlFunThing *) fun_val(term);
Uint num_free = funp->num_free;
hash = hash * FUNNY_NUMBER10 + num_free;
hash = hash*FUNNY_NUMBER1 +
(atom_tab(atom_val(funp->fe->module))->slot.bucket.hvalue);
hash = hash*FUNNY_NUMBER2 + funp->fe->old_index;
hash = hash*FUNNY_NUMBER2 + funp->fe->old_uniq;
if (num_free > 0) {
if (num_free > 1) {
WSTACK_PUSH3(stack, (UWord) &funp->env[1], (num_free-1), MAKE_HASH_FUN_OP);
}
term = funp->env[0];
goto tail_recur;
}
break;
}
case PID_DEF:
hash = hash*FUNNY_NUMBER5 + internal_pid_number(term);
break;
case EXTERNAL_PID_DEF:
hash = hash*FUNNY_NUMBER5 + external_pid_number(term);
break;
case PORT_DEF:
hash = hash*FUNNY_NUMBER9 + internal_port_number(term);
break;
case EXTERNAL_PORT_DEF:
hash = hash*FUNNY_NUMBER9 + external_port_number(term);
break;
case REF_DEF:
hash = hash*FUNNY_NUMBER9 + internal_ref_numbers(term)[0];
break;
case EXTERNAL_REF_DEF:
hash = hash*FUNNY_NUMBER9 + external_ref_numbers(term)[0];
break;
case FLOAT_DEF:
{
FloatDef ff;
GET_DOUBLE(term, ff);
hash = hash*FUNNY_NUMBER6 + (ff.fw[0] ^ ff.fw[1]);
}
break;
case MAKE_HASH_CDR_PRE_OP:
term = (Eterm) WSTACK_POP(stack);
if (is_not_list(term)) {
WSTACK_PUSH(stack, (UWord) MAKE_HASH_CDR_POST_OP);
goto tail_recur;
}
/*fall through*/
case LIST_DEF:
{
Eterm* list = list_val(term);
WSTACK_PUSH2(stack, (UWord) CDR(list),
(UWord) MAKE_HASH_CDR_PRE_OP);
term = CAR(list);
goto tail_recur;
}
case MAKE_HASH_CDR_POST_OP:
hash *= FUNNY_NUMBER8;
break;
case BIG_DEF:
{
Eterm* ptr = big_val(term);
int is_neg = BIG_SIGN(ptr);
Uint arity = BIG_ARITY(ptr);
Uint i = arity;
ptr++;
#if D_EXP == 16
/* hash over 32 bit LE */
while(i--) {
hash = hash*FUNNY_NUMBER2 + *ptr++;
}
#elif D_EXP == 32
#if defined(WORDS_BIGENDIAN)
while(i--) {
Uint d = *ptr++;
hash = hash*FUNNY_NUMBER2 + ((d << 16) | (d >> 16));
}
#else
while(i--) {
hash = hash*FUNNY_NUMBER2 + *ptr++;
}
#endif
#elif D_EXP == 64
{
Uint32 h = 0, l;
#if defined(WORDS_BIGENDIAN)
while(i--) {
Uint d = *ptr++;
l = d & 0xffffffff;
h = d >> 32;
hash = hash*FUNNY_NUMBER2 + ((l << 16) | (l >> 16));
if (h || i)
hash = hash*FUNNY_NUMBER2 + ((h << 16) | (h >> 16));
}
#else
while(i--) {
Uint d = *ptr++;
l = d & 0xffffffff;
h = d >> 32;
hash = hash*FUNNY_NUMBER2 + l;
if (h || i)
hash = hash*FUNNY_NUMBER2 + h;
}
#endif
/* adjust arity to match 32 bit mode */
arity = (arity << 1) - (h == 0);
}
#else
#error "unsupported D_EXP size"
#endif
hash = hash * (is_neg ? FUNNY_NUMBER3 : FUNNY_NUMBER2) + arity;
}
break;
case TUPLE_DEF:
{
Eterm* ptr = tuple_val(term);
Uint arity = arityval(*ptr);
WSTACK_PUSH3(stack, (UWord) arity, (UWord) (ptr+1), (UWord) arity);
op = MAKE_HASH_TUPLE_OP;
}/*fall through*/
case MAKE_HASH_TUPLE_OP:
case MAKE_HASH_FUN_OP:
{
Uint i = (Uint) WSTACK_POP(stack);
Eterm* ptr = (Eterm*) WSTACK_POP(stack);
if (i != 0) {
term = *ptr;
WSTACK_PUSH3(stack, (UWord)(ptr+1), (UWord) i-1, (UWord) op);
goto tail_recur;
}
if (op == MAKE_HASH_TUPLE_OP) {
Uint32 arity = (UWord) WSTACK_POP(stack);
hash = hash*FUNNY_NUMBER9 + arity;
}
break;
}
default:
erl_exit(1, "Invalid tag in make_broken_hash\n");
return 0;
}
if (WSTACK_ISEMPTY(stack)) break;
op = (Uint) WSTACK_POP(stack);
}
DESTROY_WSTACK(stack);
return hash;
#undef MAKE_HASH_TUPLE_OP
#undef MAKE_HASH_FUN_OP
#undef MAKE_HASH_CDR_PRE_OP
#undef MAKE_HASH_CDR_POST_OP
}
static int do_send_to_logger(Eterm tag, Eterm gleader, char *buf, int len)
{
/* error_logger !
{notify,{info_msg,gleader,{emulator,"~s~n",[<message as list>]}}} |
{notify,{error,gleader,{emulator,"~s~n",[<message as list>]}}} |
{notify,{warning_msg,gleader,{emulator,"~s~n",[<message as list>}]}} */
Eterm* hp;
Uint sz;
Uint gl_sz;
Eterm gl;
Eterm list,plist,format,tuple1,tuple2,tuple3;
ErlOffHeap *ohp;
ErlHeapFragment *bp = NULL;
#if !defined(ERTS_SMP)
Process *p;
#endif
ASSERT(is_atom(tag));
if (len <= 0) {
return -1;
}
#ifndef ERTS_SMP
if (
#ifdef USE_THREADS
!erts_get_scheduler_data() || /* Must be scheduler thread */
#endif
(p = erts_whereis_process(NULL, 0, am_error_logger, 0, 0)) == NULL
|| p->status == P_RUNNING) {
/* buf *always* points to a null terminated string */
erts_fprintf(stderr, "(no error logger present) %T: \"%s\"\n",
tag, buf);
return 0;
}
/* So we have an error logger, lets build the message */
#endif
gl_sz = IS_CONST(gleader) ? 0 : size_object(gleader);
sz = len * 2 /* message list */+ 2 /* cons surrounding message list */
+ gl_sz +
3 /*outer 2-tuple*/ + 4 /* middle 3-tuple */ + 4 /*inner 3-tuple */ +
8 /* "~s~n" */;
#ifndef ERTS_SMP
if (sz <= HeapWordsLeft(p)) {
ohp = &MSO(p);
hp = HEAP_TOP(p);
HEAP_TOP(p) += sz;
} else {
#endif
bp = new_message_buffer(sz);
ohp = &bp->off_heap;
hp = bp->mem;
#ifndef ERTS_SMP
}
#endif
gl = (is_nil(gleader)
? am_noproc
: (IS_CONST(gleader)
? gleader
: copy_struct(gleader,gl_sz,&hp,ohp)));
list = buf_to_intlist(&hp, buf, len, NIL);
plist = CONS(hp,list,NIL);
hp += 2;
format = buf_to_intlist(&hp, "~s~n", 4, NIL);
tuple1 = TUPLE3(hp, am_emulator, format, plist);
hp += 4;
tuple2 = TUPLE3(hp, tag, gl, tuple1);
hp += 4;
tuple3 = TUPLE2(hp, am_notify, tuple2);
#ifdef HARDDEBUG
erts_fprintf(stderr, "%T\n", tuple3);
#endif
#ifdef ERTS_SMP
{
Eterm from = erts_get_current_pid();
if (is_not_internal_pid(from))
from = NIL;
erts_queue_error_logger_message(from, tuple3, bp);
}
#else
erts_queue_message(p, NULL /* only used for smp build */, bp, tuple3, NIL);
#endif
return 0;
}
static ERTS_INLINE int
send_info_to_logger(Eterm gleader, char *buf, int len)
{
return do_send_to_logger(am_info_msg, gleader, buf, len);
}
static ERTS_INLINE int
send_warning_to_logger(Eterm gleader, char *buf, int len)
{
Eterm tag;
switch (erts_error_logger_warnings) {
case am_info: tag = am_info_msg; break;
case am_warning: tag = am_warning_msg; break;
default: tag = am_error; break;
}
return do_send_to_logger(tag, gleader, buf, len);
}
static ERTS_INLINE int
send_error_to_logger(Eterm gleader, char *buf, int len)
{
return do_send_to_logger(am_error, gleader, buf, len);
}
#define LOGGER_DSBUF_INC_SZ 256
static erts_dsprintf_buf_t *
grow_logger_dsbuf(erts_dsprintf_buf_t *dsbufp, size_t need)
{
size_t size;
size_t free_size = dsbufp->size - dsbufp->str_len;
ASSERT(dsbufp && dsbufp->str);
if (need <= free_size)
return dsbufp;
size = need - free_size + LOGGER_DSBUF_INC_SZ;
size = (((size + LOGGER_DSBUF_INC_SZ - 1) / LOGGER_DSBUF_INC_SZ)
* LOGGER_DSBUF_INC_SZ);
size += dsbufp->size;
ASSERT(dsbufp->str_len + need <= size);
dsbufp->str = (char *) erts_realloc(ERTS_ALC_T_LOGGER_DSBUF,
(void *) dsbufp->str,
size);
dsbufp->size = size;
return dsbufp;
}
erts_dsprintf_buf_t *
erts_create_logger_dsbuf(void)
{
erts_dsprintf_buf_t init = ERTS_DSPRINTF_BUF_INITER(grow_logger_dsbuf);
erts_dsprintf_buf_t *dsbufp = erts_alloc(ERTS_ALC_T_LOGGER_DSBUF,
sizeof(erts_dsprintf_buf_t));
sys_memcpy((void *) dsbufp, (void *) &init, sizeof(erts_dsprintf_buf_t));
dsbufp->str = (char *) erts_alloc(ERTS_ALC_T_LOGGER_DSBUF,
LOGGER_DSBUF_INC_SZ);
dsbufp->str[0] = '\0';
dsbufp->size = LOGGER_DSBUF_INC_SZ;
return dsbufp;
}
static ERTS_INLINE void
destroy_logger_dsbuf(erts_dsprintf_buf_t *dsbufp)
{
ASSERT(dsbufp && dsbufp->str);
erts_free(ERTS_ALC_T_LOGGER_DSBUF, (void *) dsbufp->str);
erts_free(ERTS_ALC_T_LOGGER_DSBUF, (void *) dsbufp);
}
int
erts_send_info_to_logger(Eterm gleader, erts_dsprintf_buf_t *dsbufp)
{
int res;
res = send_info_to_logger(gleader, dsbufp->str, dsbufp->str_len);
destroy_logger_dsbuf(dsbufp);
return res;
}
int
erts_send_warning_to_logger(Eterm gleader, erts_dsprintf_buf_t *dsbufp)
{
int res;
res = send_warning_to_logger(gleader, dsbufp->str, dsbufp->str_len);
destroy_logger_dsbuf(dsbufp);
return res;
}
int
erts_send_error_to_logger(Eterm gleader, erts_dsprintf_buf_t *dsbufp)
{
int res;
res = send_error_to_logger(gleader, dsbufp->str, dsbufp->str_len);
destroy_logger_dsbuf(dsbufp);
return res;
}
int
erts_send_info_to_logger_str(Eterm gleader, char *str)
{
return send_info_to_logger(gleader, str, sys_strlen(str));
}
int
erts_send_warning_to_logger_str(Eterm gleader, char *str)
{
return send_warning_to_logger(gleader, str, sys_strlen(str));
}
int
erts_send_error_to_logger_str(Eterm gleader, char *str)
{
return send_error_to_logger(gleader, str, sys_strlen(str));
}
int
erts_send_info_to_logger_nogl(erts_dsprintf_buf_t *dsbuf)
{
return erts_send_info_to_logger(NIL, dsbuf);
}
int
erts_send_warning_to_logger_nogl(erts_dsprintf_buf_t *dsbuf)
{
return erts_send_warning_to_logger(NIL, dsbuf);
}
int
erts_send_error_to_logger_nogl(erts_dsprintf_buf_t *dsbuf)
{
return erts_send_error_to_logger(NIL, dsbuf);
}
int
erts_send_info_to_logger_str_nogl(char *str)
{
return erts_send_info_to_logger_str(NIL, str);
}
int
erts_send_warning_to_logger_str_nogl(char *str)
{
return erts_send_warning_to_logger_str(NIL, str);
}
int
erts_send_error_to_logger_str_nogl(char *str)
{
return erts_send_error_to_logger_str(NIL, str);
}
#define TMP_DSBUF_INC_SZ 256
static erts_dsprintf_buf_t *
grow_tmp_dsbuf(erts_dsprintf_buf_t *dsbufp, size_t need)
{
size_t size;
size_t free_size = dsbufp->size - dsbufp->str_len;
ASSERT(dsbufp);
if (need <= free_size)
return dsbufp;
size = need - free_size + TMP_DSBUF_INC_SZ;
size = ((size + TMP_DSBUF_INC_SZ - 1)/TMP_DSBUF_INC_SZ)*TMP_DSBUF_INC_SZ;
size += dsbufp->size;
ASSERT(dsbufp->str_len + need <= size);
dsbufp->str = (char *) erts_realloc(ERTS_ALC_T_TMP_DSBUF,
(void *) dsbufp->str,
size);
dsbufp->size = size;
return dsbufp;
}
erts_dsprintf_buf_t *
erts_create_tmp_dsbuf(Uint size)
{
Uint init_size = size ? size : TMP_DSBUF_INC_SZ;
erts_dsprintf_buf_t init = ERTS_DSPRINTF_BUF_INITER(grow_tmp_dsbuf);
erts_dsprintf_buf_t *dsbufp = erts_alloc(ERTS_ALC_T_TMP_DSBUF,
sizeof(erts_dsprintf_buf_t));
sys_memcpy((void *) dsbufp, (void *) &init, sizeof(erts_dsprintf_buf_t));
dsbufp->str = (char *) erts_alloc(ERTS_ALC_T_TMP_DSBUF, init_size);
dsbufp->str[0] = '\0';
dsbufp->size = init_size;
return dsbufp;
}
void
erts_destroy_tmp_dsbuf(erts_dsprintf_buf_t *dsbufp)
{
if (dsbufp->str)
erts_free(ERTS_ALC_T_TMP_DSBUF, (void *) dsbufp->str);
erts_free(ERTS_ALC_T_TMP_DSBUF, (void *) dsbufp);
}
/* eq and cmp are written as separate functions a eq is a little faster */
/*
* Test for equality of two terms.
* Returns 0 if not equal, or a non-zero value otherwise.
*/
int eq(Eterm a, Eterm b)
{
DECLARE_WSTACK(stack);
Sint sz;
Eterm* aa;
Eterm* bb;
tailrecur:
if (a == b) goto pop_next;
tailrecur_ne:
switch (primary_tag(a)) {
case TAG_PRIMARY_LIST:
if (is_list(b)) {
Eterm* aval = list_val(a);
Eterm* bval = list_val(b);
while (1) {
Eterm atmp = CAR(aval);
Eterm btmp = CAR(bval);
if (atmp != btmp) {
WSTACK_PUSH2(stack,(UWord) CDR(bval),(UWord) CDR(aval));
a = atmp;
b = btmp;
goto tailrecur_ne;
}
atmp = CDR(aval);
btmp = CDR(bval);
if (atmp == btmp) {
goto pop_next;
}
if (is_not_list(atmp) || is_not_list(btmp)) {
a = atmp;
b = btmp;
goto tailrecur_ne;
}
aval = list_val(atmp);
bval = list_val(btmp);
}
}
break; /* not equal */
case TAG_PRIMARY_BOXED:
{
Eterm hdr = *boxed_val(a);
switch (hdr & _TAG_HEADER_MASK) {
case ARITYVAL_SUBTAG:
{
aa = tuple_val(a);
if (!is_boxed(b) || *boxed_val(b) != *aa)
goto not_equal;
bb = tuple_val(b);
if ((sz = arityval(*aa)) == 0) goto pop_next;
++aa;
++bb;
goto term_array;
}
case REFC_BINARY_SUBTAG:
case HEAP_BINARY_SUBTAG:
case SUB_BINARY_SUBTAG:
{
byte* a_ptr;
byte* b_ptr;
size_t a_size;
size_t b_size;
Uint a_bitsize;
Uint b_bitsize;
Uint a_bitoffs;
Uint b_bitoffs;
if (is_not_binary(b)) {
goto not_equal;
}
a_size = binary_size(a);
b_size = binary_size(b);
if (a_size != b_size) {
goto not_equal;
}
ERTS_GET_BINARY_BYTES(a, a_ptr, a_bitoffs, a_bitsize);
ERTS_GET_BINARY_BYTES(b, b_ptr, b_bitoffs, b_bitsize);
if ((a_bitsize | b_bitsize | a_bitoffs | b_bitoffs) == 0) {
if (sys_memcmp(a_ptr, b_ptr, a_size) == 0) goto pop_next;
} else if (a_bitsize == b_bitsize) {
if (erts_cmp_bits(a_ptr, a_bitoffs, b_ptr, b_bitoffs,
(a_size << 3) + a_bitsize) == 0) goto pop_next;
}
break; /* not equal */
}
case EXPORT_SUBTAG:
{
if (is_export(b)) {
Export* a_exp = *((Export **) (export_val(a) + 1));
Export* b_exp = *((Export **) (export_val(b) + 1));
if (a_exp == b_exp) goto pop_next;
}
break; /* not equal */
}
case FUN_SUBTAG:
{
ErlFunThing* f1;
ErlFunThing* f2;
if (is_not_fun(b))
goto not_equal;
f1 = (ErlFunThing *) fun_val(a);
f2 = (ErlFunThing *) fun_val(b);
if (f1->fe->module != f2->fe->module ||
f1->fe->old_index != f2->fe->old_index ||
f1->fe->old_uniq != f2->fe->old_uniq ||
f1->num_free != f2->num_free) {
goto not_equal;
}
if ((sz = f1->num_free) == 0) goto pop_next;
aa = f1->env;
bb = f2->env;
goto term_array;
}
case EXTERNAL_PID_SUBTAG:
case EXTERNAL_PORT_SUBTAG: {
ExternalThing *ap;
ExternalThing *bp;
if(is_not_external(b))
goto not_equal;
ap = external_thing_ptr(a);
bp = external_thing_ptr(b);
if(ap->header == bp->header && ap->node == bp->node) {
ASSERT(1 == external_data_words(a));
ASSERT(1 == external_data_words(b));
if (ap->data.ui[0] == bp->data.ui[0]) goto pop_next;
}
break; /* not equal */
}
case EXTERNAL_REF_SUBTAG: {
/*
* Observe!
* When comparing refs we need to compare ref numbers
* (32-bit words) *not* ref data words.
*/
Uint32 *anum;
Uint32 *bnum;
Uint common_len;
Uint alen;
Uint blen;
Uint i;
if(is_not_external_ref(b))
goto not_equal;
if(external_node(a) != external_node(b))
goto not_equal;
anum = external_ref_numbers(a);
bnum = external_ref_numbers(b);
alen = external_ref_no_of_numbers(a);
blen = external_ref_no_of_numbers(b);
goto ref_common;
case REF_SUBTAG:
if (is_not_internal_ref(b))
goto not_equal;
alen = internal_ref_no_of_numbers(a);
blen = internal_ref_no_of_numbers(b);
anum = internal_ref_numbers(a);
bnum = internal_ref_numbers(b);
ref_common:
ASSERT(alen > 0 && blen > 0);
if (anum[0] != bnum[0])
goto not_equal;
if (alen == 3 && blen == 3) {
/* Most refs are of length 3 */
if (anum[1] == bnum[1] && anum[2] == bnum[2]) {
goto pop_next;
} else {
goto not_equal;
}
}
common_len = alen;
if (blen < alen)
common_len = blen;
for (i = 1; i < common_len; i++)
if (anum[i] != bnum[i])
goto not_equal;
if(alen != blen) {
if (alen > blen) {
for (i = common_len; i < alen; i++)
if (anum[i] != 0)
goto not_equal;
}
else {
for (i = common_len; i < blen; i++)
if (bnum[i] != 0)
goto not_equal;
}
}
goto pop_next;
}
case POS_BIG_SUBTAG:
case NEG_BIG_SUBTAG:
{
int i;
if (is_not_big(b))
goto not_equal;
aa = big_val(a); /* get pointer to thing */
bb = big_val(b);
if (*aa != *bb)
goto not_equal;
i = BIG_ARITY(aa);
while(i--) {
if (*++aa != *++bb)
goto not_equal;
}
goto pop_next;
}
case FLOAT_SUBTAG:
{
FloatDef af;
FloatDef bf;
if (is_float(b)) {
GET_DOUBLE(a, af);
GET_DOUBLE(b, bf);
if (af.fd == bf.fd) goto pop_next;
}
break; /* not equal */
}
}
break;
}
}
goto not_equal;
term_array: /* arrays in 'aa' and 'bb', length in 'sz' */
ASSERT(sz != 0);
{
Eterm* ap = aa;
Eterm* bp = bb;
Sint i = sz;
for (;;) {
if (*ap != *bp) break;
if (--i == 0) goto pop_next;
++ap;
++bp;
}
a = *ap;
b = *bp;
if (is_both_immed(a,b)) {
goto not_equal;
}
if (i > 1) { /* push the rest */
WSTACK_PUSH3(stack, i-1, (UWord)(bp+1),
((UWord)(ap+1)) | TAG_PRIMARY_HEADER);
/* We (ab)use TAG_PRIMARY_HEADER to recognize a term_array */
}
goto tailrecur_ne;
}
pop_next:
if (!WSTACK_ISEMPTY(stack)) {
UWord something = WSTACK_POP(stack);
if (primary_tag((Eterm) something) == TAG_PRIMARY_HEADER) { /* a term_array */
aa = (Eterm*) something;
bb = (Eterm*) WSTACK_POP(stack);
sz = WSTACK_POP(stack);
goto term_array;
}
a = something;
b = WSTACK_POP(stack);
goto tailrecur;
}
DESTROY_WSTACK(stack);
return 1;
not_equal:
DESTROY_WSTACK(stack);
return 0;
}
/*
* Lexically compare two strings of bytes (string s1 length l1 and s2 l2).
*
* s1 < s2 return -1
* s1 = s2 return 0
* s1 > s2 return +1
*/
static int cmpbytes(byte *s1, int l1, byte *s2, int l2)
{
int i;
i = 0;
while((i < l1) && (i < l2)) {
if (s1[i] < s2[i]) return(-1);
if (s1[i] > s2[i]) return(1);
i++;
}
if (l1 < l2) return(-1);
if (l1 > l2) return(1);
return(0);
}
/*
* Compare objects.
* Returns 0 if equal, a negative value if a < b, or a positive number a > b.
*
* According to the Erlang Standard, types are orderered as follows:
* numbers < (characters) < atoms < refs < funs < ports < pids <
* tuples < [] < conses < binaries.
*
* Note that characters are currently not implemented.
*
*/
#define float_comp(x,y) (((x)<(y)) ? -1 : (((x)==(y)) ? 0 : 1))
static int cmp_atoms(Eterm a, Eterm b)
{
Atom *aa = atom_tab(atom_val(a));
Atom *bb = atom_tab(atom_val(b));
int diff = aa->ord0 - bb->ord0;
if (diff)
return diff;
return cmpbytes(aa->name+3, aa->len-3,
bb->name+3, bb->len-3);
}
Sint cmp(Eterm a, Eterm b)
{
DECLARE_WSTACK(stack);
Eterm* aa;
Eterm* bb;
int i;
Sint j;
int a_tag;
int b_tag;
ErlNode *anode;
ErlNode *bnode;
Uint adata;
Uint bdata;
Uint alen;
Uint blen;
Uint32 *anum;
Uint32 *bnum;
#define RETURN_NEQ(cmp) { j=(cmp); ASSERT(j != 0); goto not_equal; }
#define ON_CMP_GOTO(cmp) if ((j=(cmp)) == 0) goto pop_next; else goto not_equal
#undef CMP_NODES
#define CMP_NODES(AN, BN) \
do { \
if((AN) != (BN)) { \
if((AN)->sysname != (BN)->sysname) \
RETURN_NEQ(cmp_atoms((AN)->sysname, (BN)->sysname)); \
ASSERT((AN)->creation != (BN)->creation); \
RETURN_NEQ(((AN)->creation < (BN)->creation) ? -1 : 1); \
} \
} while (0)
tailrecur:
if (a == b) { /* Equal values or pointers. */
goto pop_next;
}
tailrecur_ne:
/* deal with majority (?) cases by brute-force */
if (is_atom(a)) {
if (is_atom(b)) {
ON_CMP_GOTO(cmp_atoms(a, b));
}
} else if (is_both_small(a, b)) {
ON_CMP_GOTO(signed_val(a) - signed_val(b));
}
/*
* Take care of cases where the types are the same.
*/
a_tag = 42; /* Suppress warning */
switch (primary_tag(a)) {
case TAG_PRIMARY_IMMED1:
switch ((a & _TAG_IMMED1_MASK) >> _TAG_PRIMARY_SIZE) {
case (_TAG_IMMED1_PORT >> _TAG_PRIMARY_SIZE):
if (is_internal_port(b)) {
bnode = erts_this_node;
bdata = internal_port_data(b);
} else if (is_external_port(b)) {
bnode = external_port_node(b);
bdata = external_port_data(b);
} else {
a_tag = PORT_DEF;
goto mixed_types;
}
anode = erts_this_node;
adata = internal_port_data(a);
port_common:
CMP_NODES(anode, bnode);
ON_CMP_GOTO((Sint)(adata - bdata));
case (_TAG_IMMED1_PID >> _TAG_PRIMARY_SIZE):
if (is_internal_pid(b)) {
bnode = erts_this_node;
bdata = internal_pid_data(b);
} else if (is_external_pid(b)) {
bnode = external_pid_node(b);
bdata = external_pid_data(b);
} else {
a_tag = PID_DEF;
goto mixed_types;
}
anode = erts_this_node;
adata = internal_pid_data(a);
pid_common:
if (adata != bdata) {
RETURN_NEQ(adata < bdata ? -1 : 1);
}
CMP_NODES(anode, bnode);
goto pop_next;
case (_TAG_IMMED1_SMALL >> _TAG_PRIMARY_SIZE):
a_tag = SMALL_DEF;
goto mixed_types;
case (_TAG_IMMED1_IMMED2 >> _TAG_PRIMARY_SIZE): {
switch ((a & _TAG_IMMED2_MASK) >> _TAG_IMMED1_SIZE) {
case (_TAG_IMMED2_ATOM >> _TAG_IMMED1_SIZE):
a_tag = ATOM_DEF;
goto mixed_types;
case (_TAG_IMMED2_NIL >> _TAG_IMMED1_SIZE):
a_tag = NIL_DEF;
goto mixed_types;
}
}
}
case TAG_PRIMARY_LIST:
if (is_not_list(b)) {
a_tag = LIST_DEF;
goto mixed_types;
}
aa = list_val(a);
bb = list_val(b);
while (1) {
Eterm atmp = CAR(aa);
Eterm btmp = CAR(bb);
if (atmp != btmp) {
WSTACK_PUSH2(stack,(UWord) CDR(bb),(UWord) CDR(aa));
a = atmp;
b = btmp;
goto tailrecur_ne;
}
atmp = CDR(aa);
btmp = CDR(bb);
if (atmp == btmp) {
goto pop_next;
}
if (is_not_list(atmp) || is_not_list(btmp)) {
a = atmp;
b = btmp;
goto tailrecur_ne;
}
aa = list_val(atmp);
bb = list_val(btmp);
}
case TAG_PRIMARY_BOXED:
{
Eterm ahdr = *boxed_val(a);
switch ((ahdr & _TAG_HEADER_MASK) >> _TAG_PRIMARY_SIZE) {
case (_TAG_HEADER_ARITYVAL >> _TAG_PRIMARY_SIZE):
if (is_not_tuple(b)) {
a_tag = TUPLE_DEF;
goto mixed_types;
}
aa = tuple_val(a);
bb = tuple_val(b);
/* compare the arities */
i = arityval(ahdr); /* get the arity*/
if (i != arityval(*bb)) {
RETURN_NEQ((int)(i - arityval(*bb)));
}
if (i == 0) {
goto pop_next;
}
++aa;
++bb;
goto term_array;
case (_TAG_HEADER_FLOAT >> _TAG_PRIMARY_SIZE):
if (is_not_float(b)) {
a_tag = FLOAT_DEF;
goto mixed_types;
} else {
FloatDef af;
FloatDef bf;
GET_DOUBLE(a, af);
GET_DOUBLE(b, bf);
ON_CMP_GOTO(float_comp(af.fd, bf.fd));
}
case (_TAG_HEADER_POS_BIG >> _TAG_PRIMARY_SIZE):
case (_TAG_HEADER_NEG_BIG >> _TAG_PRIMARY_SIZE):
if (is_not_big(b)) {
a_tag = BIG_DEF;
goto mixed_types;
}
ON_CMP_GOTO(big_comp(a, b));
case (_TAG_HEADER_EXPORT >> _TAG_PRIMARY_SIZE):
if (is_not_export(b)) {
a_tag = EXPORT_DEF;
goto mixed_types;
} else {
Export* a_exp = *((Export **) (export_val(a) + 1));
Export* b_exp = *((Export **) (export_val(b) + 1));
if ((j = cmp_atoms(a_exp->code[0], b_exp->code[0])) != 0) {
RETURN_NEQ(j);
}
if ((j = cmp_atoms(a_exp->code[1], b_exp->code[1])) != 0) {
RETURN_NEQ(j);
}
ON_CMP_GOTO((Sint) a_exp->code[2] - (Sint) b_exp->code[2]);
}
break;
case (_TAG_HEADER_FUN >> _TAG_PRIMARY_SIZE):
if (is_not_fun(b)) {
a_tag = FUN_DEF;
goto mixed_types;
} else {
ErlFunThing* f1 = (ErlFunThing *) fun_val(a);
ErlFunThing* f2 = (ErlFunThing *) fun_val(b);
Sint diff;
diff = cmpbytes(atom_tab(atom_val(f1->fe->module))->name,
atom_tab(atom_val(f1->fe->module))->len,
atom_tab(atom_val(f2->fe->module))->name,
atom_tab(atom_val(f2->fe->module))->len);
if (diff != 0) {
RETURN_NEQ(diff);
}
diff = f1->fe->old_index - f2->fe->old_index;
if (diff != 0) {
RETURN_NEQ(diff);
}
diff = f1->fe->old_uniq - f2->fe->old_uniq;
if (diff != 0) {
RETURN_NEQ(diff);
}
diff = f1->num_free - f2->num_free;
if (diff != 0) {
RETURN_NEQ(diff);
}
i = f1->num_free;
if (i == 0) goto pop_next;
aa = f1->env;
bb = f2->env;
goto term_array;
}
case (_TAG_HEADER_EXTERNAL_PID >> _TAG_PRIMARY_SIZE):
if (is_internal_pid(b)) {
bnode = erts_this_node;
bdata = internal_pid_data(b);
} else if (is_external_pid(b)) {
bnode = external_pid_node(b);
bdata = external_pid_data(b);
} else {
a_tag = EXTERNAL_PID_DEF;
goto mixed_types;
}
anode = external_pid_node(a);
adata = external_pid_data(a);
goto pid_common;
case (_TAG_HEADER_EXTERNAL_PORT >> _TAG_PRIMARY_SIZE):
if (is_internal_port(b)) {
bnode = erts_this_node;
bdata = internal_port_data(b);
} else if (is_external_port(b)) {
bnode = external_port_node(b);
bdata = external_port_data(b);
} else {
a_tag = EXTERNAL_PORT_DEF;
goto mixed_types;
}
anode = external_port_node(a);
adata = external_port_data(a);
goto port_common;
case (_TAG_HEADER_REF >> _TAG_PRIMARY_SIZE):
/*
* Note! When comparing refs we need to compare ref numbers
* (32-bit words), *not* ref data words.
*/
if (is_internal_ref(b)) {
bnode = erts_this_node;
bnum = internal_ref_numbers(b);
blen = internal_ref_no_of_numbers(b);
} else if(is_external_ref(b)) {
bnode = external_ref_node(b);
bnum = external_ref_numbers(b);
blen = external_ref_no_of_numbers(b);
} else {
a_tag = REF_DEF;
goto mixed_types;
}
anode = erts_this_node;
anum = internal_ref_numbers(a);
alen = internal_ref_no_of_numbers(a);
ref_common:
CMP_NODES(anode, bnode);
ASSERT(alen > 0 && blen > 0);
if (alen != blen) {
if (alen > blen) {
do {
if (anum[alen - 1] != 0)
RETURN_NEQ(1);
alen--;
} while (alen > blen);
}
else {
do {
if (bnum[blen - 1] != 0)
RETURN_NEQ(-1);
blen--;
} while (alen < blen);
}
}
ASSERT(alen == blen);
for (i = (Sint) alen - 1; i >= 0; i--)
if (anum[i] != bnum[i])
RETURN_NEQ((Sint32) (anum[i] - bnum[i]));
goto pop_next;
case (_TAG_HEADER_EXTERNAL_REF >> _TAG_PRIMARY_SIZE):
if (is_internal_ref(b)) {
bnode = erts_this_node;
bnum = internal_ref_numbers(b);
blen = internal_ref_no_of_numbers(b);
} else if (is_external_ref(b)) {
bnode = external_ref_node(b);
bnum = external_ref_numbers(b);
blen = external_ref_no_of_numbers(b);
} else {
a_tag = EXTERNAL_REF_DEF;
goto mixed_types;
}
anode = external_ref_node(a);
anum = external_ref_numbers(a);
alen = external_ref_no_of_numbers(a);
goto ref_common;
default:
/* Must be a binary */
ASSERT(is_binary(a));
if (is_not_binary(b)) {
a_tag = BINARY_DEF;
goto mixed_types;
} else {
Uint a_size = binary_size(a);
Uint b_size = binary_size(b);
Uint a_bitsize;
Uint b_bitsize;
Uint a_bitoffs;
Uint b_bitoffs;
Uint min_size;
int cmp;
byte* a_ptr;
byte* b_ptr;
ERTS_GET_BINARY_BYTES(a, a_ptr, a_bitoffs, a_bitsize);
ERTS_GET_BINARY_BYTES(b, b_ptr, b_bitoffs, b_bitsize);
if ((a_bitsize | b_bitsize | a_bitoffs | b_bitoffs) == 0) {
min_size = (a_size < b_size) ? a_size : b_size;
if ((cmp = sys_memcmp(a_ptr, b_ptr, min_size)) != 0) {
RETURN_NEQ(cmp);
}
}
else {
a_size = (a_size << 3) + a_bitsize;
b_size = (b_size << 3) + b_bitsize;
min_size = (a_size < b_size) ? a_size : b_size;
if ((cmp = erts_cmp_bits(a_ptr,a_bitoffs,
b_ptr,b_bitoffs,min_size)) != 0) {
RETURN_NEQ(cmp);
}
}
ON_CMP_GOTO((Sint)(a_size - b_size));
}
}
}
}
/*
* Take care of the case that the tags are different.
*/
mixed_types:
b_tag = tag_val_def(b);
{
FloatDef f1, f2;
Eterm big;
#if HEAP_ON_C_STACK
Eterm big_buf[2]; /* If HEAP_ON_C_STACK */
#else
Eterm *big_buf = erts_get_scheduler_data()->cmp_tmp_heap;
#endif
switch(_NUMBER_CODE(a_tag, b_tag)) {
case SMALL_BIG:
big = small_to_big(signed_val(a), big_buf);
j = big_comp(big, b);
break;
case SMALL_FLOAT:
f1.fd = signed_val(a);
GET_DOUBLE(b, f2);
j = float_comp(f1.fd, f2.fd);
break;
case BIG_SMALL:
big = small_to_big(signed_val(b), big_buf);
j = big_comp(a, big);
break;
case BIG_FLOAT:
if (big_to_double(a, &f1.fd) < 0) {
j = big_sign(a) ? -1 : 1;
} else {
GET_DOUBLE(b, f2);
j = float_comp(f1.fd, f2.fd);
}
break;
case FLOAT_SMALL:
GET_DOUBLE(a, f1);
f2.fd = signed_val(b);
j = float_comp(f1.fd, f2.fd);
break;
case FLOAT_BIG:
if (big_to_double(b, &f2.fd) < 0) {
j = big_sign(b) ? 1 : -1;
} else {
GET_DOUBLE(a, f1);
j = float_comp(f1.fd, f2.fd);
}
break;
default:
j = b_tag - a_tag;
}
}
if (j == 0) {
goto pop_next;
} else {
goto not_equal;
}
term_array: /* arrays in 'aa' and 'bb', length in 'i' */
ASSERT(i>0);
while (--i) {
a = *aa++;
b = *bb++;
if (a != b) {
if (is_atom(a) && is_atom(b)) {
if ((j = cmp_atoms(a, b)) != 0) {
goto not_equal;
}
} else if (is_both_small(a, b)) {
if ((j = signed_val(a)-signed_val(b)) != 0) {
goto not_equal;
}
} else {
/* (ab)Use TAG_PRIMARY_HEADER to recognize a term_array */
WSTACK_PUSH3(stack, i, (UWord)bb, (UWord)aa | TAG_PRIMARY_HEADER);
goto tailrecur_ne;
}
}
}
a = *aa;
b = *bb;
goto tailrecur;
pop_next:
if (!WSTACK_ISEMPTY(stack)) {
UWord something = WSTACK_POP(stack);
if (primary_tag((Eterm) something) == TAG_PRIMARY_HEADER) { /* a term_array */
aa = (Eterm*) something;
bb = (Eterm*) WSTACK_POP(stack);
i = WSTACK_POP(stack);
goto term_array;
}
a = (Eterm) something;
b = (Eterm) WSTACK_POP(stack);
goto tailrecur;
}
DESTROY_WSTACK(stack);
return 0;
not_equal:
DESTROY_ESTACK(stack);
return j;
#undef CMP_NODES
}
void
erts_cleanup_externals(ExternalThing *etp)
{
ExternalThing *tetp;
tetp = etp;
while(tetp) {
erts_deref_node_entry(tetp->node);
tetp = tetp->next;
}
}
Eterm
store_external_or_ref_(Uint **hpp, ExternalThing **etpp, Eterm ns)
{
Uint i;
Uint size;
Uint *from_hp;
Uint *to_hp = *hpp;
ASSERT(is_external(ns) || is_internal_ref(ns));
if(is_external(ns)) {
from_hp = external_val(ns);
size = thing_arityval(*from_hp) + 1;
*hpp += size;
for(i = 0; i < size; i++)
to_hp[i] = from_hp[i];
erts_refc_inc(&((ExternalThing *) to_hp)->node->refc, 2);
((ExternalThing *) to_hp)->next = *etpp;
*etpp = (ExternalThing *) to_hp;
return make_external(to_hp);
}
/* Internal ref */
from_hp = internal_ref_val(ns);
size = thing_arityval(*from_hp) + 1;
*hpp += size;
for(i = 0; i < size; i++)
to_hp[i] = from_hp[i];
return make_internal_ref(to_hp);
}
Eterm
store_external_or_ref_in_proc_(Process *proc, Eterm ns)
{
Uint sz;
Uint *hp;
ASSERT(is_external(ns) || is_internal_ref(ns));
sz = NC_HEAP_SIZE(ns);
ASSERT(sz > 0);
hp = HAlloc(proc, sz);
return store_external_or_ref_(&hp, &MSO(proc).externals, ns);
}
void bin_write(int to, void *to_arg, byte* buf, int sz)
{
int i;
for (i=0;i<sz;i++) {
if (IS_DIGIT(buf[i]))
erts_print(to, to_arg, "%d,", buf[i]);
else if (IS_PRINT(buf[i])) {
erts_print(to, to_arg, "%c,", buf[i]);
}
else
erts_print(to, to_arg, "%d,", buf[i]);
}
erts_putc(to, to_arg, '\n');
}
/* Fill buf with the contents of bytelist list
return number of chars in list or -1 for error */
int
intlist_to_buf(Eterm list, char *buf, int len)
{
Eterm* listptr;
int sz = 0;
if (is_nil(list))
return 0;
if (is_not_list(list))
return -1;
listptr = list_val(list);
while (sz < len) {
if (!is_byte(*listptr))
return -1;
buf[sz++] = unsigned_val(*listptr);
if (is_nil(*(listptr + 1)))
return(sz);
if (is_not_list(*(listptr + 1)))
return -1;
listptr = list_val(*(listptr + 1));
}
return -1; /* not enough space */
}
/*
** Convert an integer to a byte list
** return pointer to converted stuff (need not to be at start of buf!)
*/
char* Sint_to_buf(Sint n, struct Sint_buf *buf)
{
char* p = &buf->s[sizeof(buf->s)-1];
int sign = 0;
*p-- = '\0'; /* null terminate */
if (n == 0)
*p-- = '0';
else if (n < 0) {
sign = 1;
n = -n;
}
while (n != 0) {
*p-- = (n % 10) + '0';
n /= 10;
}
if (sign)
*p-- = '-';
return p+1;
}
/* Build a list of integers in some safe memory area
** Memory must be pre allocated prio call 2*len in size
** hp is a pointer to the "heap" pointer on return
** this pointer is updated to point after the list
*/
Eterm
buf_to_intlist(Eterm** hpp, char *buf, int len, Eterm tail)
{
Eterm* hp = *hpp;
buf += (len-1);
while(len > 0) {
tail = CONS(hp, make_small((byte)*buf), tail);
hp += 2;
buf--;
len--;
}
*hpp = hp;
return tail;
}
/*
** Write io list in to a buffer.
**
** An iolist is defined as:
**
** iohead ::= Binary
** | Byte (i.e integer in range [0..255]
** | iolist
** ;
**
** iotail ::= []
** | Binary (added by tony)
** | iolist
** ;
**
** iolist ::= []
** | Binary
** | [ iohead | iotail]
** ;
**
** Return remaining bytes in buffer on success
** -1 on overflow
** -2 on type error (including that result would not be a whole number of bytes)
*/
int io_list_to_buf(Eterm obj, char* buf, int len)
{
Eterm* objp;
DECLARE_ESTACK(s);
goto L_again;
while (!ESTACK_ISEMPTY(s)) {
obj = ESTACK_POP(s);
L_again:
if (is_list(obj)) {
L_iter_list:
objp = list_val(obj);
obj = CAR(objp);
if (is_byte(obj)) {
if (len == 0) {
goto L_overflow;
}
*buf++ = unsigned_val(obj);
len--;
} else if (is_binary(obj)) {
byte* bptr;
size_t size = binary_size(obj);
Uint bitsize;
Uint bitoffs;
Uint num_bits;
if (len < size) {
goto L_overflow;
}
ERTS_GET_BINARY_BYTES(obj, bptr, bitoffs, bitsize);
if (bitsize != 0) {
goto L_type_error;
}
num_bits = 8*size;
copy_binary_to_buffer(buf, 0, bptr, bitoffs, num_bits);
buf += size;
len -= size;
} else if (is_list(obj)) {
ESTACK_PUSH(s, CDR(objp));
goto L_iter_list; /* on head */
} else if (is_not_nil(obj)) {
goto L_type_error;
}
obj = CDR(objp);
if (is_list(obj)) {
goto L_iter_list; /* on tail */
} else if (is_binary(obj)) {
byte* bptr;
size_t size = binary_size(obj);
Uint bitsize;
Uint bitoffs;
Uint num_bits;
if (len < size) {
goto L_overflow;
}
ERTS_GET_BINARY_BYTES(obj, bptr, bitoffs, bitsize);
if (bitsize != 0) {
goto L_type_error;
}
num_bits = 8*size;
copy_binary_to_buffer(buf, 0, bptr, bitoffs, num_bits);
buf += size;
len -= size;
} else if (is_not_nil(obj)) {
goto L_type_error;
}
} else if (is_binary(obj)) {
byte* bptr;
size_t size = binary_size(obj);
Uint bitsize;
Uint bitoffs;
Uint num_bits;
if (len < size) {
goto L_overflow;
}
ERTS_GET_BINARY_BYTES(obj, bptr, bitoffs, bitsize);
if (bitsize != 0) {
goto L_type_error;
}
num_bits = 8*size;
copy_binary_to_buffer(buf, 0, bptr, bitoffs, num_bits);
buf += size;
len -= size;
} else if (is_not_nil(obj)) {
goto L_type_error;
}
}
DESTROY_ESTACK(s);
return len;
L_type_error:
DESTROY_ESTACK(s);
return -2;
L_overflow:
DESTROY_ESTACK(s);
return -1;
}
int io_list_len(Eterm obj)
{
Eterm* objp;
Sint len = 0;
DECLARE_ESTACK(s);
goto L_again;
while (!ESTACK_ISEMPTY(s)) {
obj = ESTACK_POP(s);
L_again:
if (is_list(obj)) {
L_iter_list:
objp = list_val(obj);
/* Head */
obj = CAR(objp);
if (is_byte(obj)) {
len++;
} else if (is_binary(obj) && binary_bitsize(obj) == 0) {
len += binary_size(obj);
} else if (is_list(obj)) {
ESTACK_PUSH(s, CDR(objp));
goto L_iter_list; /* on head */
} else if (is_not_nil(obj)) {
goto L_type_error;
}
/* Tail */
obj = CDR(objp);
if (is_list(obj))
goto L_iter_list; /* on tail */
else if (is_binary(obj) && binary_bitsize(obj) == 0) {
len += binary_size(obj);
} else if (is_not_nil(obj)) {
goto L_type_error;
}
} else if (is_binary(obj) && binary_bitsize(obj) == 0) { /* Tail was binary */
len += binary_size(obj);
} else if (is_not_nil(obj)) {
goto L_type_error;
}
}
DESTROY_ESTACK(s);
return len;
L_type_error:
DESTROY_ESTACK(s);
return -1;
}
/* return 0 if item is not a non-empty flat list of bytes */
int
is_string(Eterm list)
{
int len = 0;
while(is_list(list)) {
Eterm* consp = list_val(list);
Eterm hd = CAR(consp);
if (!is_byte(hd))
return 0;
len++;
list = CDR(consp);
}
if (is_nil(list))
return len;
return 0;
}
#ifdef ERTS_SMP
/*
* Process and Port timers in smp case
*/
ERTS_SCHED_PREF_PRE_ALLOC_IMPL(ptimer_pre, ErtsSmpPTimer, 1000)
#define ERTS_PTMR_FLGS_ALLCD_SIZE \
2
#define ERTS_PTMR_FLGS_ALLCD_MASK \
((((Uint32) 1) << ERTS_PTMR_FLGS_ALLCD_SIZE) - 1)
#define ERTS_PTMR_FLGS_PREALLCD ((Uint32) 1)
#define ERTS_PTMR_FLGS_SLALLCD ((Uint32) 2)
#define ERTS_PTMR_FLGS_LLALLCD ((Uint32) 3)
#define ERTS_PTMR_FLG_CANCELLED (((Uint32) 1) << (ERTS_PTMR_FLGS_ALLCD_SIZE+0))
static void
init_ptimers(void)
{
init_ptimer_pre_alloc();
}
static ERTS_INLINE void
free_ptimer(ErtsSmpPTimer *ptimer)
{
switch (ptimer->timer.flags & ERTS_PTMR_FLGS_ALLCD_MASK) {
case ERTS_PTMR_FLGS_PREALLCD:
(void) ptimer_pre_free(ptimer);
break;
case ERTS_PTMR_FLGS_SLALLCD:
erts_free(ERTS_ALC_T_SL_PTIMER, (void *) ptimer);
break;
case ERTS_PTMR_FLGS_LLALLCD:
erts_free(ERTS_ALC_T_LL_PTIMER, (void *) ptimer);
break;
default:
erl_exit(ERTS_ABORT_EXIT,
"Internal error: Bad ptimer alloc type\n");
break;
}
}
/* Callback for process timeout cancelled */
static void
ptimer_cancelled(ErtsSmpPTimer *ptimer)
{
free_ptimer(ptimer);
}
/* Callback for process timeout */
static void
ptimer_timeout(ErtsSmpPTimer *ptimer)
{
if (is_internal_pid(ptimer->timer.id)) {
Process *p;
p = erts_pid2proc_opt(NULL,
0,
ptimer->timer.id,
ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS,
ERTS_P2P_FLG_ALLOW_OTHER_X);
if (p) {
if (!p->is_exiting
&& !(ptimer->timer.flags & ERTS_PTMR_FLG_CANCELLED)) {
ASSERT(*ptimer->timer.timer_ref == ptimer);
*ptimer->timer.timer_ref = NULL;
(*ptimer->timer.timeout_func)(p);
}
erts_smp_proc_unlock(p, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS);
}
}
else {
Port *p;
ASSERT(is_internal_port(ptimer->timer.id));
p = erts_id2port_sflgs(ptimer->timer.id,
NULL,
0,
ERTS_PORT_SFLGS_DEAD);
if (p) {
if (!(ptimer->timer.flags & ERTS_PTMR_FLG_CANCELLED)) {
ASSERT(*ptimer->timer.timer_ref == ptimer);
*ptimer->timer.timer_ref = NULL;
(*ptimer->timer.timeout_func)(p);
}
erts_port_release(p);
}
}
free_ptimer(ptimer);
}
void
erts_create_smp_ptimer(ErtsSmpPTimer **timer_ref,
Eterm id,
ErlTimeoutProc timeout_func,
Uint timeout)
{
ErtsSmpPTimer *res = ptimer_pre_alloc();
if (res)
res->timer.flags = ERTS_PTMR_FLGS_PREALLCD;
else {
if (timeout < ERTS_ALC_MIN_LONG_LIVED_TIME) {
res = erts_alloc(ERTS_ALC_T_SL_PTIMER, sizeof(ErtsSmpPTimer));
res->timer.flags = ERTS_PTMR_FLGS_SLALLCD;
}
else {
res = erts_alloc(ERTS_ALC_T_LL_PTIMER, sizeof(ErtsSmpPTimer));
res->timer.flags = ERTS_PTMR_FLGS_LLALLCD;
}
}
res->timer.timeout_func = timeout_func;
res->timer.timer_ref = timer_ref;
res->timer.id = id;
res->timer.tm.active = 0; /* MUST be initalized */
ASSERT(!*timer_ref);
*timer_ref = res;
erl_set_timer(&res->timer.tm,
(ErlTimeoutProc) ptimer_timeout,
(ErlCancelProc) ptimer_cancelled,
(void*) res,
timeout);
}
void
erts_cancel_smp_ptimer(ErtsSmpPTimer *ptimer)
{
if (ptimer) {
ASSERT(*ptimer->timer.timer_ref == ptimer);
*ptimer->timer.timer_ref = NULL;
ptimer->timer.flags |= ERTS_PTMR_FLG_CANCELLED;
erl_cancel_timer(&ptimer->timer.tm);
}
}
#endif
static Sint trim_threshold;
static Sint top_pad;
static Sint mmap_threshold;
static Sint mmap_max;
Uint tot_bin_allocated;
void erts_init_utils(void)
{
#ifdef ERTS_SMP
init_ptimers();
#endif
}
void erts_init_utils_mem(void)
{
trim_threshold = -1;
top_pad = -1;
mmap_threshold = -1;
mmap_max = -1;
}
int
sys_alloc_opt(int opt, int value)
{
#if HAVE_MALLOPT
Sint m_opt;
Sint *curr_val;
switch(opt) {
case SYS_ALLOC_OPT_TRIM_THRESHOLD:
#ifdef M_TRIM_THRESHOLD
m_opt = M_TRIM_THRESHOLD;
curr_val = &trim_threshold;
break;
#else
return 0;
#endif
case SYS_ALLOC_OPT_TOP_PAD:
#ifdef M_TOP_PAD
m_opt = M_TOP_PAD;
curr_val = &top_pad;
break;
#else
return 0;
#endif
case SYS_ALLOC_OPT_MMAP_THRESHOLD:
#ifdef M_MMAP_THRESHOLD
m_opt = M_MMAP_THRESHOLD;
curr_val = &mmap_threshold;
break;
#else
return 0;
#endif
case SYS_ALLOC_OPT_MMAP_MAX:
#ifdef M_MMAP_MAX
m_opt = M_MMAP_MAX;
curr_val = &mmap_max;
break;
#else
return 0;
#endif
default:
return 0;
}
if(mallopt(m_opt, value)) {
*curr_val = (Sint) value;
return 1;
}
#endif /* #if HAVE_MALLOPT */
return 0;
}
void
sys_alloc_stat(SysAllocStat *sasp)
{
sasp->trim_threshold = trim_threshold;
sasp->top_pad = top_pad;
sasp->mmap_threshold = mmap_threshold;
sasp->mmap_max = mmap_max;
}
#ifdef ERTS_SMP
/* Local system block state */
struct {
int emergency;
long emergency_timeout;
erts_smp_cnd_t watchdog_cnd;
erts_smp_tid_t watchdog_tid;
int threads_to_block;
int have_blocker;
erts_smp_tid_t blocker_tid;
int recursive_block;
Uint32 allowed_activities;
erts_smp_tsd_key_t blockable_key;
erts_smp_mtx_t mtx;
erts_smp_cnd_t cnd;
#ifdef ERTS_ENABLE_LOCK_CHECK
int activity_changing;
int checking;
#endif
} system_block_state;
/* Global system block state */
erts_system_block_state_t erts_system_block_state;
static ERTS_INLINE int
is_blockable_thread(void)
{
return erts_smp_tsd_get(system_block_state.blockable_key) != NULL;
}
static ERTS_INLINE int
is_blocker(void)
{
return (system_block_state.have_blocker
&& erts_smp_equal_tids(system_block_state.blocker_tid,
erts_smp_thr_self()));
}
#ifdef ERTS_ENABLE_LOCK_CHECK
int
erts_lc_is_blocking(void)
{
int res;
erts_smp_mtx_lock(&system_block_state.mtx);
res = erts_smp_pending_system_block() && is_blocker();
erts_smp_mtx_unlock(&system_block_state.mtx);
return res;
}
#endif
static ERTS_INLINE void
block_me(void (*prepare)(void *),
void (*resume)(void *),
void *arg,
int mtx_locked,
int want_to_block,
int update_act_changing,
profile_sched_msg_q *psmq)
{
if (prepare)
(*prepare)(arg);
/* Locks might be held... */
if (!mtx_locked)
erts_smp_mtx_lock(&system_block_state.mtx);
if (erts_smp_pending_system_block() && !is_blocker()) {
int is_blockable = is_blockable_thread();
ASSERT(is_blockable);
if (is_blockable)
system_block_state.threads_to_block--;
if (erts_system_profile_flags.scheduler && psmq) {
ErtsSchedulerData *esdp = erts_get_scheduler_data();
if (esdp) {
profile_sched_msg *msg = NULL;
ASSERT(psmq->n < 2);
msg = &((psmq->msg)[psmq->n]);
msg->scheduler_id = esdp->no;
get_now(&(msg->Ms), &(msg->s), &(msg->us));
msg->no_schedulers = 0;
msg->state = am_inactive;
psmq->n++;
}
}
#ifdef ERTS_ENABLE_LOCK_CHECK
if (update_act_changing)
system_block_state.activity_changing--;
#endif
erts_smp_cnd_broadcast(&system_block_state.cnd);
do {
erts_smp_cnd_wait(&system_block_state.cnd, &system_block_state.mtx);
} while (erts_smp_pending_system_block()
&& !(want_to_block && !system_block_state.have_blocker));
#ifdef ERTS_ENABLE_LOCK_CHECK
if (update_act_changing)
system_block_state.activity_changing++;
#endif
if (erts_system_profile_flags.scheduler && psmq) {
ErtsSchedulerData *esdp = erts_get_scheduler_data();
if (esdp) {
profile_sched_msg *msg = NULL;
ASSERT(psmq->n < 2);
msg = &((psmq->msg)[psmq->n]);
msg->scheduler_id = esdp->no;
get_now(&(msg->Ms), &(msg->s), &(msg->us));
msg->no_schedulers = 0;
msg->state = am_active;
psmq->n++;
}
}
if (is_blockable)
system_block_state.threads_to_block++;
}
if (!mtx_locked)
erts_smp_mtx_unlock(&system_block_state.mtx);
if (resume)
(*resume)(arg);
}
void
erts_block_me(void (*prepare)(void *),
void (*resume)(void *),
void *arg)
{
profile_sched_msg_q psmq;
psmq.n = 0;
if (prepare)
(*prepare)(arg);
#ifdef ERTS_ENABLE_LOCK_CHECK
erts_lc_check_exact(NULL, 0); /* No locks should be locked */
#endif
block_me(NULL, NULL, NULL, 0, 0, 0, &psmq);
if (erts_system_profile_flags.scheduler && psmq.n > 0)
dispatch_profile_msg_q(&psmq);
if (resume)
(*resume)(arg);
}
void
erts_register_blockable_thread(void)
{
profile_sched_msg_q psmq;
psmq.n = 0;
if (!is_blockable_thread()) {
erts_smp_mtx_lock(&system_block_state.mtx);
system_block_state.threads_to_block++;
erts_smp_tsd_set(system_block_state.blockable_key,
(void *) &erts_system_block_state);
/* Someone might be waiting for us to block... */
if (erts_smp_pending_system_block())
block_me(NULL, NULL, NULL, 1, 0, 0, &psmq);
erts_smp_mtx_unlock(&system_block_state.mtx);
if (erts_system_profile_flags.scheduler && psmq.n > 0)
dispatch_profile_msg_q(&psmq);
}
}
void
erts_unregister_blockable_thread(void)
{
if (is_blockable_thread()) {
erts_smp_mtx_lock(&system_block_state.mtx);
system_block_state.threads_to_block--;
ASSERT(system_block_state.threads_to_block >= 0);
erts_smp_tsd_set(system_block_state.blockable_key, NULL);
/* Someone might be waiting for us to block... */
if (erts_smp_pending_system_block())
erts_smp_cnd_broadcast(&system_block_state.cnd);
erts_smp_mtx_unlock(&system_block_state.mtx);
}
}
void
erts_note_activity_begin(erts_activity_t activity)
{
erts_smp_mtx_lock(&system_block_state.mtx);
if (erts_smp_pending_system_block()) {
Uint32 broadcast = 0;
switch (activity) {
case ERTS_ACTIVITY_GC:
broadcast = (system_block_state.allowed_activities
& ERTS_BS_FLG_ALLOW_GC);
break;
case ERTS_ACTIVITY_IO:
broadcast = (system_block_state.allowed_activities
& ERTS_BS_FLG_ALLOW_IO);
break;
case ERTS_ACTIVITY_WAIT:
broadcast = 1;
break;
default:
abort();
break;
}
if (broadcast)
erts_smp_cnd_broadcast(&system_block_state.cnd);
}
erts_smp_mtx_unlock(&system_block_state.mtx);
}
void
erts_check_block(erts_activity_t old_activity,
erts_activity_t new_activity,
int locked,
void (*prepare)(void *),
void (*resume)(void *),
void *arg)
{
int do_block;
profile_sched_msg_q psmq;
psmq.n = 0;
if (!locked && prepare)
(*prepare)(arg);
erts_smp_mtx_lock(&system_block_state.mtx);
/* First check if it is ok to block... */
if (!locked)
do_block = 1;
else {
switch (old_activity) {
case ERTS_ACTIVITY_UNDEFINED:
do_block = 0;
break;
case ERTS_ACTIVITY_GC:
do_block = (system_block_state.allowed_activities
& ERTS_BS_FLG_ALLOW_GC);
break;
case ERTS_ACTIVITY_IO:
do_block = (system_block_state.allowed_activities
& ERTS_BS_FLG_ALLOW_IO);
break;
case ERTS_ACTIVITY_WAIT:
/* You are not allowed to leave activity waiting
* without supplying the possibility to block
* unlocked.
*/
erts_set_activity_error(ERTS_ACT_ERR_LEAVE_WAIT_UNLOCKED,
__FILE__, __LINE__);
do_block = 0;
break;
default:
erts_set_activity_error(ERTS_ACT_ERR_LEAVE_UNKNOWN_ACTIVITY,
__FILE__, __LINE__);
do_block = 0;
break;
}
}
if (do_block) {
/* ... then check if it is necessary to block... */
switch (new_activity) {
case ERTS_ACTIVITY_UNDEFINED:
do_block = 1;
break;
case ERTS_ACTIVITY_GC:
do_block = !(system_block_state.allowed_activities
& ERTS_BS_FLG_ALLOW_GC);
break;
case ERTS_ACTIVITY_IO:
do_block = !(system_block_state.allowed_activities
& ERTS_BS_FLG_ALLOW_IO);
break;
case ERTS_ACTIVITY_WAIT:
/* No need to block if we are going to wait */
do_block = 0;
break;
default:
erts_set_activity_error(ERTS_ACT_ERR_ENTER_UNKNOWN_ACTIVITY,
__FILE__, __LINE__);
break;
}
}
if (do_block) {
#ifdef ERTS_ENABLE_LOCK_CHECK
if (!locked) {
/* Only system_block_state.mtx should be held */
erts_lc_check_exact(&system_block_state.mtx.lc, 1);
}
#endif
block_me(NULL, NULL, NULL, 1, 0, 1, &psmq);
}
erts_smp_mtx_unlock(&system_block_state.mtx);
if (erts_system_profile_flags.scheduler && psmq.n > 0)
dispatch_profile_msg_q(&psmq);
if (!locked && resume)
(*resume)(arg);
}
void
erts_set_activity_error(erts_activity_error_t error, char *file, int line)
{
switch (error) {
case ERTS_ACT_ERR_LEAVE_WAIT_UNLOCKED:
erl_exit(1, "%s:%d: Fatal error: Leaving activity waiting without "
"supplying the possibility to block unlocked.",
file, line);
break;
case ERTS_ACT_ERR_LEAVE_UNKNOWN_ACTIVITY:
erl_exit(1, "%s:%d: Fatal error: Leaving unknown activity.",
file, line);
break;
case ERTS_ACT_ERR_ENTER_UNKNOWN_ACTIVITY:
erl_exit(1, "%s:%d: Fatal error: Leaving unknown activity.",
file, line);
break;
default:
erl_exit(1, "%s:%d: Internal error in erts_smp_set_activity()",
file, line);
break;
}
}
static ERTS_INLINE int
threads_not_under_control(void)
{
int res = system_block_state.threads_to_block;
/* Waiting is always an allowed activity... */
res -= erts_smp_atomic_read(&erts_system_block_state.in_activity.wait);
if (system_block_state.allowed_activities & ERTS_BS_FLG_ALLOW_GC)
res -= erts_smp_atomic_read(&erts_system_block_state.in_activity.gc);
if (system_block_state.allowed_activities & ERTS_BS_FLG_ALLOW_IO)
res -= erts_smp_atomic_read(&erts_system_block_state.in_activity.io);
if (res < 0) {
ASSERT(0);
return 0;
}
return res;
}
/*
* erts_block_system() blocks all threads registered as blockable.
* It doesn't return until either all threads have blocked (0 is returned)
* or it has timed out (ETIMEDOUT) is returned.
*
* If allowed activities == 0, blocked threads will release all locks
* before blocking.
*
* If allowed_activities is != 0, erts_block_system() will allow blockable
* threads to continue executing as long as they are doing an allowed
* activity. When they are done with the allowed activity they will block,
* *but* they will block holding locks. Therefore, the thread calling
* erts_block_system() must *not* try to aquire any locks that might be
* held by blocked threads holding locks from allowed activities.
*
* Currently allowed_activities are:
* * ERTS_BS_FLG_ALLOW_GC Thread continues with garbage
* collection and blocks with
* main process lock on current
* process locked.
* * ERTS_BS_FLG_ALLOW_IO Thread continues with I/O
*/
void
erts_block_system(Uint32 allowed_activities)
{
int do_block;
profile_sched_msg_q psmq;
psmq.n = 0;
#ifdef ERTS_ENABLE_LOCK_CHECK
erts_lc_check_exact(NULL, 0); /* No locks should be locked */
#endif
erts_smp_mtx_lock(&system_block_state.mtx);
do_block = erts_smp_pending_system_block();
if (do_block
&& system_block_state.have_blocker
&& erts_smp_equal_tids(system_block_state.blocker_tid,
erts_smp_thr_self())) {
ASSERT(system_block_state.recursive_block >= 0);
system_block_state.recursive_block++;
/* You are not allowed to restrict allowed activites
in a recursive block! */
ERTS_SMP_LC_ASSERT((system_block_state.allowed_activities
& ~allowed_activities) == 0);
}
else {
erts_smp_atomic_inc(&erts_system_block_state.do_block);
/* Someone else might be waiting for us to block... */
if (do_block) {
do_block_me:
block_me(NULL, NULL, NULL, 1, 1, 0, &psmq);
}
ASSERT(!system_block_state.have_blocker);
system_block_state.have_blocker = 1;
system_block_state.blocker_tid = erts_smp_thr_self();
system_block_state.allowed_activities = allowed_activities;
if (is_blockable_thread())
system_block_state.threads_to_block--;
while (threads_not_under_control() && !system_block_state.emergency)
erts_smp_cnd_wait(&system_block_state.cnd, &system_block_state.mtx);
if (system_block_state.emergency) {
system_block_state.have_blocker = 0;
goto do_block_me;
}
}
erts_smp_mtx_unlock(&system_block_state.mtx);
if (erts_system_profile_flags.scheduler && psmq.n > 0 )
dispatch_profile_msg_q(&psmq);
}
/*
* erts_emergency_block_system() should only be called when we are
* about to write a crash dump...
*/
int
erts_emergency_block_system(long timeout, Uint32 allowed_activities)
{
int res = 0;
long another_blocker;
erts_smp_mtx_lock(&system_block_state.mtx);
if (system_block_state.emergency) {
/* Argh... */
res = EINVAL;
goto done;
}
another_blocker = erts_smp_pending_system_block();
system_block_state.emergency = 1;
erts_smp_atomic_inc(&erts_system_block_state.do_block);
if (another_blocker) {
if (is_blocker()) {
erts_smp_atomic_dec(&erts_system_block_state.do_block);
res = 0;
goto done;
}
/* kick the other blocker */
erts_smp_cnd_broadcast(&system_block_state.cnd);
while (system_block_state.have_blocker)
erts_smp_cnd_wait(&system_block_state.cnd, &system_block_state.mtx);
}
ASSERT(!system_block_state.have_blocker);
system_block_state.have_blocker = 1;
system_block_state.blocker_tid = erts_smp_thr_self();
system_block_state.allowed_activities = allowed_activities;
if (is_blockable_thread())
system_block_state.threads_to_block--;
if (timeout < 0) {
while (threads_not_under_control())
erts_smp_cnd_wait(&system_block_state.cnd, &system_block_state.mtx);
}
else {
system_block_state.emergency_timeout = timeout;
erts_smp_cnd_signal(&system_block_state.watchdog_cnd);
while (system_block_state.emergency_timeout >= 0
&& threads_not_under_control()) {
erts_smp_cnd_wait(&system_block_state.cnd,
&system_block_state.mtx);
}
}
done:
erts_smp_mtx_unlock(&system_block_state.mtx);
return res;
}
void
erts_release_system(void)
{
long do_block;
profile_sched_msg_q psmq;
psmq.n = 0;
#ifdef ERTS_ENABLE_LOCK_CHECK
erts_lc_check_exact(NULL, 0); /* No locks should be locked */
#endif
erts_smp_mtx_lock(&system_block_state.mtx);
ASSERT(is_blocker());
ASSERT(system_block_state.recursive_block >= 0);
if (system_block_state.recursive_block)
system_block_state.recursive_block--;
else {
do_block = erts_smp_atomic_dectest(&erts_system_block_state.do_block);
system_block_state.have_blocker = 0;
if (is_blockable_thread())
system_block_state.threads_to_block++;
else
do_block = 0;
/* Someone else might be waiting for us to block... */
if (do_block)
block_me(NULL, NULL, NULL, 1, 0, 0, &psmq);
else
erts_smp_cnd_broadcast(&system_block_state.cnd);
}
erts_smp_mtx_unlock(&system_block_state.mtx);
if (erts_system_profile_flags.scheduler && psmq.n > 0)
dispatch_profile_msg_q(&psmq);
}
#ifdef ERTS_ENABLE_LOCK_CHECK
void
erts_lc_activity_change_begin(void)
{
erts_smp_mtx_lock(&system_block_state.mtx);
system_block_state.activity_changing++;
erts_smp_mtx_unlock(&system_block_state.mtx);
}
void
erts_lc_activity_change_end(void)
{
erts_smp_mtx_lock(&system_block_state.mtx);
system_block_state.activity_changing--;
if (system_block_state.checking && !system_block_state.activity_changing)
erts_smp_cnd_broadcast(&system_block_state.cnd);
erts_smp_mtx_unlock(&system_block_state.mtx);
}
#endif
int
erts_is_system_blocked(erts_activity_t allowed_activities)
{
int blkd;
erts_smp_mtx_lock(&system_block_state.mtx);
blkd = (erts_smp_pending_system_block()
&& system_block_state.have_blocker
&& erts_smp_equal_tids(system_block_state.blocker_tid,
erts_smp_thr_self())
&& !(system_block_state.allowed_activities & ~allowed_activities));
#ifdef ERTS_ENABLE_LOCK_CHECK
if (blkd) {
system_block_state.checking = 1;
while (system_block_state.activity_changing)
erts_smp_cnd_wait(&system_block_state.cnd, &system_block_state.mtx);
system_block_state.checking = 0;
blkd = !threads_not_under_control();
}
#endif
erts_smp_mtx_unlock(&system_block_state.mtx);
return blkd;
}
static void *
emergency_watchdog(void *unused)
{
erts_smp_mtx_lock(&system_block_state.mtx);
while (1) {
long timeout;
while (system_block_state.emergency_timeout < 0)
erts_smp_cnd_wait(&system_block_state.watchdog_cnd, &system_block_state.mtx);
timeout = system_block_state.emergency_timeout;
erts_smp_mtx_unlock(&system_block_state.mtx);
if (erts_disable_tolerant_timeofday)
erts_milli_sleep(timeout);
else {
SysTimeval to;
erts_get_timeval(&to);
to.tv_sec += timeout / 1000;
to.tv_usec += timeout % 1000;
while (1) {
SysTimeval curr;
erts_milli_sleep(timeout);
erts_get_timeval(&curr);
if (curr.tv_sec > to.tv_sec
|| (curr.tv_sec == to.tv_sec && curr.tv_usec >= to.tv_usec)) {
break;
}
timeout = (to.tv_sec - curr.tv_sec)*1000;
timeout += (to.tv_usec - curr.tv_usec)/1000;
}
}
erts_smp_mtx_lock(&system_block_state.mtx);
system_block_state.emergency_timeout = -1;
erts_smp_cnd_broadcast(&system_block_state.cnd);
}
erts_smp_mtx_unlock(&system_block_state.mtx);
return NULL;
}
void
erts_system_block_init(void)
{
erts_smp_thr_opts_t thr_opts = ERTS_SMP_THR_OPTS_DEFAULT_INITER;
/* Local state... */
system_block_state.emergency = 0;
system_block_state.emergency_timeout = -1;
erts_smp_cnd_init(&system_block_state.watchdog_cnd);
system_block_state.threads_to_block = 0;
system_block_state.have_blocker = 0;
/* system_block_state.block_tid */
system_block_state.recursive_block = 0;
system_block_state.allowed_activities = 0;
erts_smp_tsd_key_create(&system_block_state.blockable_key);
erts_smp_mtx_init(&system_block_state.mtx, "system_block");
erts_smp_cnd_init(&system_block_state.cnd);
#ifdef ERTS_ENABLE_LOCK_CHECK
system_block_state.activity_changing = 0;
system_block_state.checking = 0;
#endif
thr_opts.suggested_stack_size = 8;
erts_smp_thr_create(&system_block_state.watchdog_tid,
emergency_watchdog,
NULL,
&thr_opts);
/* Global state... */
erts_smp_atomic_init(&erts_system_block_state.do_block, 0L);
erts_smp_atomic_init(&erts_system_block_state.in_activity.wait, 0L);
erts_smp_atomic_init(&erts_system_block_state.in_activity.gc, 0L);
erts_smp_atomic_init(&erts_system_block_state.in_activity.io, 0L);
/* Make sure blockable threads unregister when exiting... */
erts_smp_install_exit_handler(erts_unregister_blockable_thread);
}
#endif /* #ifdef ERTS_SMP */
char *
erts_read_env(char *key)
{
size_t value_len = 256;
char *value = erts_alloc(ERTS_ALC_T_TMP, value_len);
int res;
while (1) {
res = erts_sys_getenv(key, value, &value_len);
if (res <= 0)
break;
value = erts_realloc(ERTS_ALC_T_TMP, value, value_len);
}
if (res != 0) {
erts_free(ERTS_ALC_T_TMP, value);
return NULL;
}
return value;
}
void
erts_free_read_env(void *value)
{
if (value)
erts_free(ERTS_ALC_T_TMP, value);
}
int
erts_write_env(char *key, char *value)
{
int ix, res;
size_t key_len = sys_strlen(key), value_len = sys_strlen(value);
char *key_value = erts_alloc_fnf(ERTS_ALC_T_TMP,
key_len + 1 + value_len + 1);
if (!key_value) {
errno = ENOMEM;
return -1;
}
sys_memcpy((void *) key_value, (void *) key, key_len);
ix = key_len;
key_value[ix++] = '=';
sys_memcpy((void *) key_value, (void *) value, value_len);
ix += value_len;
key_value[ix] = '\0';
res = erts_sys_putenv(key_value, key_len);
erts_free(ERTS_ALC_T_TMP, key_value);
return res;
}
/*
* To be used to silence unused result warnings, but do not abuse it.
*/
void erts_silence_warn_unused_result(long unused)
{
}
#ifdef DEBUG
/*
* Handy functions when using a debugger - don't use in the code!
*/
void upp(buf,sz)
byte* buf;
int sz;
{
bin_write(ERTS_PRINT_STDERR,NULL,buf,sz);
}
void pat(Eterm atom)
{
upp(atom_tab(atom_val(atom))->name,
atom_tab(atom_val(atom))->len);
}
void pinfo()
{
process_info(ERTS_PRINT_STDOUT, NULL);
}
void pp(p)
Process *p;
{
if(p)
print_process_info(ERTS_PRINT_STDERR, NULL, p);
}
void ppi(Eterm pid)
{
pp(erts_pid2proc_unlocked(pid));
}
void td(Eterm x)
{
erts_fprintf(stderr, "%T\n", x);
}
void
ps(Process* p, Eterm* stop)
{
Eterm* sp = STACK_START(p) - 1;
if (stop <= STACK_END(p)) {
stop = STACK_END(p) + 1;
}
while(sp >= stop) {
erts_printf("%p: %.75T\n", sp, *sp);
sp--;
}
}
#endif
