*
* Floating point read/write functions.
*
- * Copyright (c) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
*
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
*
* Reference: ISO C99 standard 5.2.4
*/
#include <babeltrace/ctf/types.h>
#include <glib.h>
#include <float.h> /* C99 floating point definitions */
+#include <limits.h> /* C99 limits */
#include <endian.h>
/*
/*
* Aliasing float/double and unsigned long is not strictly permitted by strict
- * aliasing, but in practice type prunning is well supported, and this permits
+ * aliasing, but in practice declaration prunning is well supported, and this permits
* us to use per-word read/writes rather than per-byte.
*/
size_t sign_start, exp_start, mantissa_start, len;
};
-void ctf_float_copy(unsigned char *destp, const struct ctf_float *dest,
- const unsigned char *src, const struct ctf_float *src)
+void _ctf_float_copy(struct stream_pos *destp,
+ const struct declaration_float *dest_declaration,
+ struct stream_pos *srcp,
+ const struct declaration_float *src_declaration)
{
- struct pos_len destpos, srcpos;
- union {
- unsigned long long u;
- long long s;
- } tmp;
-
- destpos.len = dest.exp_len + dest.mantissa_len;
- if (dest.byte_order == LITTLE_ENDIAN) {
- destpos.sign_start = destpos.len - 1;
- destpos.exp_start = destpos.sign_start - dest->exp_len;
- destpos.mantissa_start = 0;
+ uint8_t sign;
+ int64_t exp;
+ uint64_t mantissa;
+
+ /* Read */
+ if (src_declaration->byte_order == LITTLE_ENDIAN) {
+ mantissa = ctf_uint_read(srcp, src_declaration->mantissa);
+ exp = ctf_int_read(srcp, src_declaration->exp);
+ sign = ctf_uint_read(srcp, src_declaration->sign);
} else {
- destpos.sign_start = 0;
- destpos.exp_start = 1;
- destpos.mantissa_start = destpos.exp_start + dest->exp_len;
+ sign = ctf_uint_read(srcp, src_declaration->sign);
+ exp = ctf_int_read(srcp, src_declaration->exp);
+ mantissa = ctf_uint_read(srcp, src_declaration->mantissa);
}
-
- srcpos.len = src.exp_len + src.mantissa_len;
- if (src.byte_order == LITTLE_ENDIAN) {
- srcpos.sign_start = srcpos.len - 1;
- srcpos.exp_start = srcpos.sign_start - src->exp_len;
- srcpos.mantissa_start = 0;
+ /* Write */
+ if (dest_declaration->byte_order == LITTLE_ENDIAN) {
+ ctf_uint_write(destp, dest_declaration->mantissa, mantissa);
+ ctf_int_write(destp, dest_declaration->exp, exp);
+ ctf_uint_write(destp, dest_declaration->sign, sign);
} else {
- srcpos.sign_start = 0;
- srcpos.exp_start = 1;
- srcpos.mantissa_start = srcpos.exp_start + src->exp_len;
+ ctf_uint_write(destp, dest_declaration->sign, sign);
+ ctf_int_write(destp, dest_declaration->exp, exp);
+ ctf_uint_write(destp, dest_declaration->mantissa, mantissa);
}
+}
- /* sign */
- tmp.u = ctf_bitfield_unsigned_read(ptr, srcpos.sign_start, 1,
- src->byte_order);
- ctf_bitfield_unsigned_write(&u.bits, destpos.sign_start, 1,
- dest->byte_order, tmp.u);
-
- /* mantissa (without leading 1). No sign extend. */
- tmp.u = ctf_bitfield_unsigned_read(ptr, srcpos.mantissa_start,
- src->mantissa_len - 1,
- src->byte_order);
- ctf_bitfield_unsigned_write(&u.bits, destpos.mantissa_start,
- dest->mantissa_len - 1, dest->byte_order,
- tmp.u);
-
- /* exponent, with sign-extend. */
- tmp.s = ctf_bitfield_signed_read(ptr, srcpos.exp_start, src->exp_len,
- src->byte_order);
- ctf_bitfield_signed_write(&u.bits, destpos.exp_start, dest->exp_len,
- dest->byte_order, tmp.s);
+void ctf_float_copy(struct stream_pos *dest, struct stream_pos *src,
+ const struct declaration_float *float_declaration)
+{
+ align_pos(src, float_declaration->p.alignment);
+ align_pos(dest, float_declaration->p.alignment);
+ _ctf_float_copy(dest, float_declaration, src, float_declaration);
}
-double ctf_double_read(const unsigned char *ptr, const struct ctf_float *src)
+double ctf_double_read(struct stream_pos *srcp,
+ const struct declaration_float *float_declaration)
{
union doubleIEEE754 u;
- struct ctf_float dest = {
- .exp_len = sizeof(double) * CHAR_BIT - DBL_MANT_DIG,
- .mantissa_len = DBL_MANT_DIG,
- .byte_order = BYTE_ORDER,
- };
-
- ctf_float_copy(&u.bits, &dest, ptr, src);
+ struct declaration_float *dest_declaration =
+ float_declaration_new(DBL_MANT_DIG,
+ sizeof(double) * CHAR_BIT - DBL_MANT_DIG,
+ BYTE_ORDER,
+ __alignof__(double));
+ struct stream_pos destp;
+
+ align_pos(srcp, float_declaration->p.alignment);
+ init_pos(&destp, (char *) u.bits);
+ _ctf_float_copy(&destp, dest_declaration, srcp, float_declaration);
+ declaration_unref(&dest_declaration->p);
return u.v;
}
-size_t ctf_double_write(unsigned char *ptr, const struct ctf_float *dest,
- double v)
+void ctf_double_write(struct stream_pos *destp,
+ const struct declaration_float *float_declaration,
+ double v)
{
union doubleIEEE754 u;
- struct ctf_float src = {
- .exp_len = sizeof(double) * CHAR_BIT - DBL_MANT_DIG,
- .mantissa_len = DBL_MANT_DIG,
- .byte_order = BYTE_ORDER,
- };
-
- if (!ptr)
- goto end;
+ struct declaration_float *src_declaration =
+ float_declaration_new(DBL_MANT_DIG,
+ sizeof(double) * CHAR_BIT - DBL_MANT_DIG,
+ BYTE_ORDER,
+ __alignof__(double));
+ struct stream_pos srcp;
+
u.v = v;
- ctf_float_copy(ptr, dest, &u.bits, &src);
-end:
- return len;
+ align_pos(destp, float_declaration->p.alignment);
+ init_pos(&srcp, (char *) u.bits);
+ _ctf_float_copy(destp, float_declaration, &srcp, src_declaration);
+ declaration_unref(&src_declaration->p);
}
-long double ctf_ldouble_read(const unsigned char *ptr,
- const struct ctf_float *src)
+long double ctf_ldouble_read(struct stream_pos *srcp,
+ const struct declaration_float *float_declaration)
{
union ldoubleIEEE754 u;
- struct ctf_float dest = {
- .exp_len = sizeof(double) * CHAR_BIT - LDBL_MANT_DIG,
- .mantissa_len = LDBL_MANT_DIG,
- .byte_order = BYTE_ORDER,
- };
-
- ctf_float_copy(&u.bits, &dest, ptr, src);
+ struct declaration_float *dest_declaration =
+ float_declaration_new(LDBL_MANT_DIG,
+ sizeof(long double) * CHAR_BIT - LDBL_MANT_DIG,
+ BYTE_ORDER,
+ __alignof__(long double));
+ struct stream_pos destp;
+
+ align_pos(srcp, float_declaration->p.alignment);
+ init_pos(&destp, (char *) u.bits);
+ _ctf_float_copy(&destp, dest_declaration, srcp, float_declaration);
+ declaration_unref(&dest_declaration->p);
return u.v;
}
-size_t ctf_ldouble_write(unsigned char *ptr, const struct ctf_float *dest,
- long double v)
+void ctf_ldouble_write(struct stream_pos *destp,
+ const struct declaration_float *float_declaration,
+ long double v)
{
union ldoubleIEEE754 u;
- struct ctf_float src = {
- .exp_len = sizeof(double) * CHAR_BIT - LDBL_MANT_DIG,
- .mantissa_len = LDBL_MANT_DIG,
- .byte_order = BYTE_ORDER,
- };
-
- if (!ptr)
- goto end;
+ struct declaration_float *src_declaration =
+ float_declaration_new(LDBL_MANT_DIG,
+ sizeof(long double) * CHAR_BIT - LDBL_MANT_DIG,
+ BYTE_ORDER,
+ __alignof__(long double));
+ struct stream_pos srcp;
+
u.v = v;
- ctf_float_copy(ptr, dest, &u.bits, &src);
-end:
- return len;
+ align_pos(destp, float_declaration->p.alignment);
+ init_pos(&srcp, (char *) u.bits);
+ _ctf_float_copy(destp, float_declaration, &srcp, src_declaration);
+ declaration_unref(&src_declaration->p);
}
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