/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2006-2009. 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%
*/
/*
* Numeric guard BIFs.
*/
#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"
static Eterm gc_double_to_integer(Process* p, double x, Eterm* reg, Uint live);
static Eterm double_to_integer(Process* p, double x);
/*
* Guard BIFs called using apply/3 and guard BIFs that never build
* anything on the heap.
*/
BIF_RETTYPE abs_1(BIF_ALIST_1)
{
Eterm res;
Sint i0, i;
Eterm* hp;
/* integer arguments */
if (is_small(BIF_ARG_1)) {
i0 = signed_val(BIF_ARG_1);
i = labs(i0);
if (i0 == MIN_SMALL) {
hp = HAlloc(BIF_P, BIG_UINT_HEAP_SIZE);
BIF_RET(uint_to_big(i, hp));
} else {
BIF_RET(make_small(i));
}
} else if (is_big(BIF_ARG_1)) {
if (!big_sign(BIF_ARG_1)) {
BIF_RET(BIF_ARG_1);
} else {
int sz = big_arity(BIF_ARG_1) + 1;
Uint* x;
hp = HAlloc(BIF_P, sz); /* See note at beginning of file */
sz--;
res = make_big(hp);
x = big_val(BIF_ARG_1);
*hp++ = make_pos_bignum_header(sz);
x++; /* skip thing */
while(sz--)
*hp++ = *x++;
BIF_RET(res);
}
} else if (is_float(BIF_ARG_1)) {
FloatDef f;
GET_DOUBLE(BIF_ARG_1, f);
if (f.fd < 0.0) {
hp = HAlloc(BIF_P, FLOAT_SIZE_OBJECT);
f.fd = fabs(f.fd);
res = make_float(hp);
PUT_DOUBLE(f, hp);
BIF_RET(res);
}
else
BIF_RET(BIF_ARG_1);
}
BIF_ERROR(BIF_P, BADARG);
}
BIF_RETTYPE float_1(BIF_ALIST_1)
{
Eterm res;
Eterm* hp;
FloatDef f;
/* check args */
if (is_not_integer(BIF_ARG_1)) {
if (is_float(BIF_ARG_1)) {
BIF_RET(BIF_ARG_1);
} else {
badarg:
BIF_ERROR(BIF_P, BADARG);
}
}
if (is_small(BIF_ARG_1)) {
Sint i = signed_val(BIF_ARG_1);
f.fd = i; /* use "C"'s auto casting */
} else if (big_to_double(BIF_ARG_1, &f.fd) < 0) {
goto badarg;
}
hp = HAlloc(BIF_P, FLOAT_SIZE_OBJECT);
res = make_float(hp);
PUT_DOUBLE(f, hp);
BIF_RET(res);
}
BIF_RETTYPE trunc_1(BIF_ALIST_1)
{
Eterm res;
FloatDef f;
/* check arg */
if (is_not_float(BIF_ARG_1)) {
if (is_integer(BIF_ARG_1))
BIF_RET(BIF_ARG_1);
BIF_ERROR(BIF_P, BADARG);
}
/* get the float */
GET_DOUBLE(BIF_ARG_1, f);
/* truncate it and return the resultant integer */
res = double_to_integer(BIF_P, (f.fd >= 0.0) ? floor(f.fd) : ceil(f.fd));
BIF_RET(res);
}
BIF_RETTYPE round_1(BIF_ALIST_1)
{
Eterm res;
FloatDef f;
/* check arg */
if (is_not_float(BIF_ARG_1)) {
if (is_integer(BIF_ARG_1))
BIF_RET(BIF_ARG_1);
BIF_ERROR(BIF_P, BADARG);
}
/* get the float */
GET_DOUBLE(BIF_ARG_1, f);
/* round it and return the resultant integer */
res = double_to_integer(BIF_P, (f.fd > 0.0) ? f.fd + 0.5 : f.fd - 0.5);
BIF_RET(res);
}
BIF_RETTYPE length_1(BIF_ALIST_1)
{
Eterm list;
Uint i;
if (is_nil(BIF_ARG_1))
BIF_RET(SMALL_ZERO);
if (is_not_list(BIF_ARG_1)) {
BIF_ERROR(BIF_P, BADARG);
}
list = BIF_ARG_1;
i = 0;
while (is_list(list)) {
i++;
list = CDR(list_val(list));
}
if (is_not_nil(list)) {
BIF_ERROR(BIF_P, BADARG);
}
BIF_RET(make_small(i));
}
/* returns the size of a tuple or a binary */
BIF_RETTYPE size_1(BIF_ALIST_1)
{
if (is_tuple(BIF_ARG_1)) {
Eterm* tupleptr = tuple_val(BIF_ARG_1);
BIF_RET(make_small(arityval(*tupleptr)));
} else if (is_binary(BIF_ARG_1)) {
Uint sz = binary_size(BIF_ARG_1);
if (IS_USMALL(0, sz)) {
return make_small(sz);
} else {
Eterm* hp = HAlloc(BIF_P, BIG_UINT_HEAP_SIZE);
BIF_RET(uint_to_big(sz, hp));
}
}
BIF_ERROR(BIF_P, BADARG);
}
/**********************************************************************/
/* returns the bitsize of a bitstring */
BIF_RETTYPE bit_size_1(BIF_ALIST_1)
{
Uint low_bits;
Uint bytesize;
Uint high_bits;
if (is_binary(BIF_ARG_1)) {
bytesize = binary_size(BIF_ARG_1);
high_bits = bytesize >> ((sizeof(Uint) * 8)-3);
low_bits = (bytesize << 3) + binary_bitsize(BIF_ARG_1);
if (high_bits == 0) {
if (IS_USMALL(0,low_bits)) {
BIF_RET(make_small(low_bits));
} else {
Eterm* hp = HAlloc(BIF_P, BIG_UINT_HEAP_SIZE);
BIF_RET(uint_to_big(low_bits, hp));
}
} else {
Uint sz = BIG_UINT_HEAP_SIZE+1;
Eterm* hp = HAlloc(BIF_P, sz);
hp[0] = make_pos_bignum_header(sz-1);
BIG_DIGIT(hp,0) = low_bits;
BIG_DIGIT(hp,1) = high_bits;
BIF_RET(make_big(hp));
}
} else {
BIF_ERROR(BIF_P, BADARG);
}
}
/**********************************************************************/
/* returns the number of bytes need to store a bitstring */
BIF_RETTYPE byte_size_1(BIF_ALIST_1)
{
if (is_binary(BIF_ARG_1)) {
Uint bytesize = binary_size(BIF_ARG_1);
if (binary_bitsize(BIF_ARG_1) > 0) {
bytesize++;
}
if (IS_USMALL(0, bytesize)) {
BIF_RET(make_small(bytesize));
} else {
Eterm* hp = HAlloc(BIF_P, BIG_UINT_HEAP_SIZE);
BIF_RET(uint_to_big(bytesize, hp));
}
} else {
BIF_ERROR(BIF_P, BADARG);
}
}
/*
* Generate the integer part from a double.
*/
static Eterm
double_to_integer(Process* p, double x)
{
int is_negative;
int ds;
ErtsDigit* xp;
int i;
Eterm res;
size_t sz;
Eterm* hp;
double dbase;
if ((x < (double) (MAX_SMALL+1)) && (x > (double) (MIN_SMALL-1))) {
Sint xi = x;
return make_small(xi);
}
if (x >= 0) {
is_negative = 0;
} else {
is_negative = 1;
x = -x;
}
/* Unscale & (calculate exponent) */
ds = 0;
dbase = ((double)(D_MASK)+1);
while(x >= 1.0) {
x /= dbase; /* "shift" right */
ds++;
}
sz = BIG_NEED_SIZE(ds); /* number of words including arity */
hp = HAlloc(p, sz);
res = make_big(hp);
xp = (ErtsDigit*) (hp + 1);
for (i = ds-1; i >= 0; i--) {
ErtsDigit d;
x *= dbase; /* "shift" left */
d = x; /* trunc */
xp[i] = d; /* store digit */
x -= d; /* remove integer part */
}
while ((ds & (BIG_DIGITS_PER_WORD-1)) != 0) {
xp[ds++] = 0;
}
if (is_negative) {
*hp = make_neg_bignum_header(sz-1);
} else {
*hp = make_pos_bignum_header(sz-1);
}
return res;
}
/*
* The following code is used when a guard that may build on the
* heap is called directly. They must not use HAlloc(), but must
* do a garbage collection if there is insufficient heap space.
*/
#define ERTS_NEED_GC(p, need) ((HEAP_LIMIT((p)) - HEAP_TOP((p))) <= (need))
Eterm erts_gc_length_1(Process* p, Eterm* reg, Uint live)
{
Eterm list = reg[live];
int i;
if (is_nil(list))
return SMALL_ZERO;
i = 0;
while (is_list(list)) {
i++;
list = CDR(list_val(list));
}
if (is_not_nil(list)) {
BIF_ERROR(p, BADARG);
}
return make_small(i);
}
Eterm erts_gc_size_1(Process* p, Eterm* reg, Uint live)
{
Eterm arg = reg[live];
if (is_tuple(arg)) {
Eterm* tupleptr = tuple_val(arg);
return make_small(arityval(*tupleptr));
} else if (is_binary(arg)) {
Uint sz = binary_size(arg);
if (IS_USMALL(0, sz)) {
return make_small(sz);
} else {
Eterm* hp;
if (ERTS_NEED_GC(p, BIG_UINT_HEAP_SIZE)) {
erts_garbage_collect(p, BIG_UINT_HEAP_SIZE, reg, live);
}
hp = p->htop;
p->htop += BIG_UINT_HEAP_SIZE;
return uint_to_big(sz, hp);
}
}
BIF_ERROR(p, BADARG);
}
Eterm erts_gc_bit_size_1(Process* p, Eterm* reg, Uint live)
{
Eterm arg = reg[live];
if (is_binary(arg)) {
Uint low_bits;
Uint bytesize;
Uint high_bits;
bytesize = binary_size(arg);
high_bits = bytesize >> ((sizeof(Uint) * 8)-3);
low_bits = (bytesize << 3) + binary_bitsize(arg);
if (high_bits == 0) {
if (IS_USMALL(0,low_bits)) {
return make_small(low_bits);
} else {
Eterm* hp;
if (ERTS_NEED_GC(p, BIG_UINT_HEAP_SIZE)) {
erts_garbage_collect(p, BIG_UINT_HEAP_SIZE, reg, live);
}
hp = p->htop;
p->htop += BIG_UINT_HEAP_SIZE;
return uint_to_big(low_bits, hp);
}
} else {
Uint sz = BIG_UINT_HEAP_SIZE+1;
Eterm* hp;
if (ERTS_NEED_GC(p, sz)) {
erts_garbage_collect(p, sz, reg, live);
}
hp = p->htop;
p->htop += sz;
hp[0] = make_pos_bignum_header(sz-1);
BIG_DIGIT(hp,0) = low_bits;
BIG_DIGIT(hp,1) = high_bits;
return make_big(hp);
}
} else {
BIF_ERROR(p, BADARG);
}
}
Eterm erts_gc_byte_size_1(Process* p, Eterm* reg, Uint live)
{
Eterm arg = reg[live];
if (is_binary(arg)) {
Uint bytesize = binary_size(arg);
if (binary_bitsize(arg) > 0) {
bytesize++;
}
if (IS_USMALL(0, bytesize)) {
return make_small(bytesize);
} else {
Eterm* hp;
if (ERTS_NEED_GC(p, BIG_UINT_HEAP_SIZE)) {
erts_garbage_collect(p, BIG_UINT_HEAP_SIZE, reg, live);
}
hp = p->htop;
p->htop += BIG_UINT_HEAP_SIZE;
return uint_to_big(bytesize, hp);
}
} else {
BIF_ERROR(p, BADARG);
}
}
Eterm erts_gc_abs_1(Process* p, Eterm* reg, Uint live)
{
Eterm arg;
Eterm res;
Sint i0, i;
Eterm* hp;
arg = reg[live];
/* integer arguments */
if (is_small(arg)) {
i0 = signed_val(arg);
i = labs(i0);
if (i0 == MIN_SMALL) {
if (ERTS_NEED_GC(p, BIG_UINT_HEAP_SIZE)) {
erts_garbage_collect(p, BIG_UINT_HEAP_SIZE, reg, live+1);
arg = reg[live];
}
hp = p->htop;
p->htop += BIG_UINT_HEAP_SIZE;
return uint_to_big(i, hp);
} else {
return make_small(i);
}
} else if (is_big(arg)) {
if (!big_sign(arg)) {
return arg;
} else {
int sz = big_arity(arg) + 1;
Uint* x;
if (ERTS_NEED_GC(p, sz)) {
erts_garbage_collect(p, sz, reg, live+1);
arg = reg[live];
}
hp = p->htop;
p->htop += sz;
sz--;
res = make_big(hp);
x = big_val(arg);
*hp++ = make_pos_bignum_header(sz);
x++; /* skip thing */
while(sz--)
*hp++ = *x++;
return res;
}
} else if (is_float(arg)) {
FloatDef f;
GET_DOUBLE(arg, f);
if (f.fd < 0.0) {
if (ERTS_NEED_GC(p, FLOAT_SIZE_OBJECT)) {
erts_garbage_collect(p, FLOAT_SIZE_OBJECT, reg, live+1);
arg = reg[live];
}
hp = p->htop;
p->htop += FLOAT_SIZE_OBJECT;
f.fd = fabs(f.fd);
res = make_float(hp);
PUT_DOUBLE(f, hp);
return res;
}
else
return arg;
}
BIF_ERROR(p, BADARG);
}
Eterm erts_gc_float_1(Process* p, Eterm* reg, Uint live)
{
Eterm arg;
Eterm res;
Eterm* hp;
FloatDef f;
/* check args */
arg = reg[live];
if (is_not_integer(arg)) {
if (is_float(arg)) {
return arg;
} else {
badarg:
BIF_ERROR(p, BADARG);
}
}
if (is_small(arg)) {
Sint i = signed_val(arg);
f.fd = i; /* use "C"'s auto casting */
} else if (big_to_double(arg, &f.fd) < 0) {
goto badarg;
}
if (ERTS_NEED_GC(p, FLOAT_SIZE_OBJECT)) {
erts_garbage_collect(p, FLOAT_SIZE_OBJECT, reg, live+1);
arg = reg[live];
}
hp = p->htop;
p->htop += FLOAT_SIZE_OBJECT;
res = make_float(hp);
PUT_DOUBLE(f, hp);
return res;
}
Eterm erts_gc_round_1(Process* p, Eterm* reg, Uint live)
{
Eterm arg;
FloatDef f;
arg = reg[live];
if (is_not_float(arg)) {
if (is_integer(arg)) {
return arg;
}
BIF_ERROR(p, BADARG);
}
GET_DOUBLE(arg, f);
return gc_double_to_integer(p, (f.fd > 0.0) ? f.fd + 0.5 : f.fd - 0.5,
reg, live);
}
Eterm erts_gc_trunc_1(Process* p, Eterm* reg, Uint live)
{
Eterm arg;
FloatDef f;
arg = reg[live];
if (is_not_float(arg)) {
if (is_integer(arg)) {
return arg;
}
BIF_ERROR(p, BADARG);
}
/* get the float */
GET_DOUBLE(arg, f);
/* truncate it and return the resultant integer */
return gc_double_to_integer(p, (f.fd >= 0.0) ? floor(f.fd) : ceil(f.fd),
reg, live);
}
static Eterm
gc_double_to_integer(Process* p, double x, Eterm* reg, Uint live)
{
int is_negative;
int ds;
ErtsDigit* xp;
int i;
Eterm res;
size_t sz;
Eterm* hp;
double dbase;
if ((x < (double) (MAX_SMALL+1)) && (x > (double) (MIN_SMALL-1))) {
Sint xi = x;
return make_small(xi);
}
if (x >= 0) {
is_negative = 0;
} else {
is_negative = 1;
x = -x;
}
/* Unscale & (calculate exponent) */
ds = 0;
dbase = ((double)(D_MASK)+1);
while(x >= 1.0) {
x /= dbase; /* "shift" right */
ds++;
}
sz = BIG_NEED_SIZE(ds); /* number of words including arity */
if (ERTS_NEED_GC(p, sz)) {
erts_garbage_collect(p, sz, reg, live);
}
hp = p->htop;
p->htop += sz;
res = make_big(hp);
xp = (ErtsDigit*) (hp + 1);
for (i = ds-1; i >= 0; i--) {
ErtsDigit d;
x *= dbase; /* "shift" left */
d = x; /* trunc */
xp[i] = d; /* store digit */
x -= d; /* remove integer part */
}
while ((ds & (BIG_DIGITS_PER_WORD-1)) != 0) {
xp[ds++] = 0;
}
if (is_negative) {
*hp = make_neg_bignum_header(sz-1);
} else {
*hp = make_pos_bignum_header(sz-1);
}
return res;
}
