X-Git-Url: http://git.efficios.com/?p=babeltrace.git;a=blobdiff_plain;f=formats%2Fctf%2Ftypes%2Ffloat.c;h=8bb3f743be2a27bc0e79cbf8380093ce5a6797ef;hp=eb0291ec6eca080b11cfd42ee40efd7df78d9e1d;hb=8563e754804a60faf870282d494ea419dc87016b;hpb=7172902caa455601e0d7429378e898eb12bbb2ba diff --git a/formats/ctf/types/float.c b/formats/ctf/types/float.c index eb0291ec..8bb3f743 100644 --- a/formats/ctf/types/float.c +++ b/formats/ctf/types/float.c @@ -3,28 +3,25 @@ * * Floating point read/write functions. * - * Copyright (c) 2010 Mathieu Desnoyers + * Copyright 2010 - Mathieu Desnoyers * - * 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 +#include #include #include /* C99 floating point definitions */ +#include /* C99 limits */ #include /* @@ -35,7 +32,7 @@ /* * 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. */ @@ -67,119 +64,105 @@ union ldoubleIEEE754 { #endif }; +static struct declaration_float *static_ldouble_declaration; + struct pos_len { 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, + struct definition_float *dest_definition, + struct stream_pos *srcp, + const struct definition_float *src_definition) { - 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; + /* Read */ + if (src_definition->declaration->byte_order == LITTLE_ENDIAN) { + ctf_integer_read(srcp, &src_definition->mantissa->p); + ctf_integer_read(srcp, &src_definition->exp->p); + ctf_integer_read(srcp, &src_definition->sign->p); } else { - destpos.sign_start = 0; - destpos.exp_start = 1; - destpos.mantissa_start = destpos.exp_start + dest->exp_len; + ctf_integer_read(srcp, &src_definition->sign->p); + ctf_integer_read(srcp, &src_definition->exp->p); + ctf_integer_read(srcp, &src_definition->mantissa->p); } - 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; + dest_definition->mantissa->value._unsigned = + src_definition->mantissa->value._unsigned; + dest_definition->exp->value._signed = + src_definition->exp->value._signed; + dest_definition->sign->value._unsigned = + src_definition->sign->value._unsigned; + + /* Write */ + if (dest_definition->declaration->byte_order == LITTLE_ENDIAN) { + ctf_integer_write(destp, &dest_definition->mantissa->p); + ctf_integer_write(destp, &dest_definition->exp->p); + ctf_integer_write(destp, &dest_definition->sign->p); } else { - srcpos.sign_start = 0; - srcpos.exp_start = 1; - srcpos.mantissa_start = srcpos.exp_start + src->exp_len; + ctf_integer_write(destp, &dest_definition->sign->p); + ctf_integer_write(destp, &dest_definition->exp->p); + ctf_integer_write(destp, &dest_definition->mantissa->p); } - - /* sign */ - tmp.u = bitfield_unsigned_read(ptr, srcpos.sign_start, 1, - src->byte_order); - bitfield_unsigned_write(&u.bits, destpos.sign_start, 1, - dest->byte_order, tmp.u); - - /* mantissa (without leading 1). No sign extend. */ - tmp.u = bitfield_unsigned_read(ptr, srcpos.mantissa_start, - src->mantissa_len - 1, src->byte_order); - bitfield_unsigned_write(&u.bits, destpos.mantissa_start, - dest->mantissa_len - 1, dest->byte_order, tmp.u); - - /* exponent, with sign-extend. */ - tmp.s = bitfield_signed_read(ptr, srcpos.exp_start, src->exp_len, - src->byte_order); - bitfield_signed_write(&u.bits, destpos.exp_start, dest->exp_len, - dest->byte_order, tmp.s); } -double ctf_double_read(const unsigned char *ptr, const struct ctf_float *src) +void ctf_float_read(struct stream_pos *ppos, struct definition *definition) { - 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, - }; - - float_copy(&u.bits, &dest, ptr, src); - return u.v; + struct definition_float *float_definition = + container_of(definition, struct definition_float, p); + const struct declaration_float *float_declaration = + float_definition->declaration; + struct ctf_stream_pos *pos = ctf_pos(ppos); + union ldoubleIEEE754 u; + struct definition *tmpdef = + static_ldouble_declaration->p.definition_new(&static_ldouble_declaration->p, + NULL, 0, 0); + struct definition_float *tmpfloat = + container_of(tmpdef, struct definition_float, p); + struct ctf_stream_pos destp; + + ctf_init_pos(&destp, -1, O_WRONLY); + destp.base = (char *) u.bits; + + ctf_align_pos(pos, float_declaration->p.alignment); + _ctf_float_copy(&destp.parent, tmpfloat, ppos, float_definition); + float_definition->value = u.v; + definition_unref(tmpdef); } -size_t ctf_double_write(unsigned char *ptr, const struct ctf_float *dest, - double v) +void ctf_float_write(struct stream_pos *ppos, struct definition *definition) { - 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; - u.v = v; - float_copy(ptr, dest, &u.bits, &src); -end: - return len; + struct definition_float *float_definition = + container_of(definition, struct definition_float, p); + const struct declaration_float *float_declaration = + float_definition->declaration; + struct ctf_stream_pos *pos = ctf_pos(ppos); + union ldoubleIEEE754 u; + struct definition *tmpdef = + static_ldouble_declaration->p.definition_new(&static_ldouble_declaration->p, + NULL, 0, 0); + struct definition_float *tmpfloat = + container_of(tmpdef, struct definition_float, p); + struct ctf_stream_pos srcp; + + ctf_init_pos(&srcp, -1, O_RDONLY); + srcp.base = (char *) u.bits; + + u.v = float_definition->value; + ctf_align_pos(pos, float_declaration->p.alignment); + _ctf_float_copy(ppos, float_definition, &srcp.parent, tmpfloat); + definition_unref(tmpdef); } -long double ctf_ldouble_read(const unsigned char *ptr, - const struct ctf_float *src) +void __attribute__((constructor)) ctf_float_init(void) { - 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, - }; - - float_copy(&u.bits, &dest, ptr, src); - return u.v; + static_ldouble_declaration = + float_declaration_new(LDBL_MANT_DIG, + sizeof(long double) * CHAR_BIT - LDBL_MANT_DIG, + BYTE_ORDER, + __alignof__(long double)); } -size_t ctf_ldouble_write(unsigned char *ptr, const struct ctf_float *dest, - long double v) +void __attribute__((destructor)) ctf_float_fini(void) { - 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; - u.v = v; - float_copy(ptr, dest, &u.bits, &src); -end: - return len; + declaration_unref(&static_ldouble_declaration->p); }