+++ /dev/null
-/*
- * Common Trace Format
- *
- * Floating point read/write functions.
- *
- * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
- *
- * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * 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:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 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 <babeltrace/compat/limits.h> /* C99 limits */
-#include <babeltrace/endian.h>
-#include <pthread.h>
-
-/*
- * This library is limited to binary representation of floating point values.
- * We use hardware support for conversion between 32 and 64-bit floating
- * point values.
- */
-
-/*
- * Aliasing float/double and unsigned long is not strictly permitted by strict
- * aliasing, but in practice declaration prunning is well supported, and this permits
- * us to use per-word read/writes rather than per-byte.
- */
-
-#if defined(__GNUC__) || defined(__MINGW32__) || defined(_MSC_VER)
-#define HAS_TYPE_PRUNING
-#endif
-
-#if (FLT_RADIX != 2)
-
-#error "Unsupported floating point radix"
-
-#endif
-
-union doubleIEEE754 {
- double vd;
- float vf;
-#ifdef HAS_TYPE_PRUNING
- unsigned long bits[(sizeof(double) + sizeof(unsigned long) - 1) / sizeof(unsigned long)];
-#else
- unsigned char bits[sizeof(double)];
-#endif
-};
-
-/*
- * This mutex protects the static temporary float and double
- * declarations (static_float_declaration and static_double_declaration).
- */
-static pthread_mutex_t float_mutex = PTHREAD_MUTEX_INITIALIZER;
-
-static struct declaration_float *static_float_declaration,
- *static_double_declaration;
-
-struct pos_len {
- size_t len;
-};
-
-static void float_lock(void)
-{
- int ret;
-
- ret = pthread_mutex_lock(&float_mutex);
- assert(!ret);
-}
-
-static void float_unlock(void)
-{
- int ret;
-
- ret = pthread_mutex_unlock(&float_mutex);
- assert(!ret);
-}
-
-static int _ctf_float_copy(struct bt_stream_pos *destp,
- struct definition_float *dest_definition,
- struct bt_stream_pos *srcp,
- const struct definition_float *src_definition)
-{
- int ret;
-
- /* We only support copy of same-size floats for now */
- assert(src_definition->declaration->sign->len ==
- dest_definition->declaration->sign->len);
- assert(src_definition->declaration->exp->len ==
- dest_definition->declaration->exp->len);
- assert(src_definition->declaration->mantissa->len ==
- dest_definition->declaration->mantissa->len);
- /* Read */
- if (src_definition->declaration->byte_order == LITTLE_ENDIAN) {
- ret = ctf_integer_read(srcp, &src_definition->mantissa->p);
- if (ret)
- return ret;
- ret = ctf_integer_read(srcp, &src_definition->exp->p);
- if (ret)
- return ret;
- ret = ctf_integer_read(srcp, &src_definition->sign->p);
- if (ret)
- return ret;
- } else {
- ret = ctf_integer_read(srcp, &src_definition->sign->p);
- if (ret)
- return ret;
- ret = ctf_integer_read(srcp, &src_definition->exp->p);
- if (ret)
- return ret;
- ret = ctf_integer_read(srcp, &src_definition->mantissa->p);
- if (ret)
- return ret;
- }
-
- 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) {
- ret = ctf_integer_write(destp, &dest_definition->mantissa->p);
- if (ret)
- return ret;
- ret = ctf_integer_write(destp, &dest_definition->exp->p);
- if (ret)
- return ret;
- ret = ctf_integer_write(destp, &dest_definition->sign->p);
- if (ret)
- return ret;
- } else {
- ret = ctf_integer_write(destp, &dest_definition->sign->p);
- if (ret)
- return ret;
- ret = ctf_integer_write(destp, &dest_definition->exp->p);
- if (ret)
- return ret;
- ret = ctf_integer_write(destp, &dest_definition->mantissa->p);
- if (ret)
- return ret;
- }
- return 0;
-}
-
-int ctf_float_read(struct bt_stream_pos *ppos, struct bt_definition *definition)
-{
- 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 doubleIEEE754 u;
- struct bt_definition *tmpdef;
- struct definition_float *tmpfloat;
- struct ctf_stream_pos destp;
- struct mmap_align mma;
- int ret;
-
- float_lock();
- switch (float_declaration->mantissa->len + 1) {
- case FLT_MANT_DIG:
- tmpdef = static_float_declaration->p.definition_new(
- &static_float_declaration->p,
- NULL, 0, 0, "__tmpfloat");
- break;
- case DBL_MANT_DIG:
- tmpdef = static_double_declaration->p.definition_new(
- &static_double_declaration->p,
- NULL, 0, 0, "__tmpfloat");
- break;
- default:
- ret = -EINVAL;
- goto end;
- }
- tmpfloat = container_of(tmpdef, struct definition_float, p);
- memset(&destp, 0, sizeof(destp));
- ctf_init_pos(&destp, NULL, -1, O_RDWR);
- mmap_align_set_addr(&mma, (char *) u.bits);
- destp.base_mma = &mma;
- destp.content_size = destp.packet_size = sizeof(u) * CHAR_BIT;
- if (!ctf_align_pos(pos, float_declaration->p.alignment)) {
- ret = -EFAULT;
- goto end_unref;
- }
- ret = _ctf_float_copy(&destp.parent, tmpfloat, ppos, float_definition);
- switch (float_declaration->mantissa->len + 1) {
- case FLT_MANT_DIG:
- float_definition->value = u.vf;
- break;
- case DBL_MANT_DIG:
- float_definition->value = u.vd;
- break;
- default:
- ret = -EINVAL;
- goto end_unref;
- }
-
-end_unref:
- bt_definition_unref(tmpdef);
-end:
- float_unlock();
- return ret;
-}
-
-int ctf_float_write(struct bt_stream_pos *ppos, struct bt_definition *definition)
-{
- 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 doubleIEEE754 u;
- struct bt_definition *tmpdef;
- struct definition_float *tmpfloat;
- struct ctf_stream_pos srcp = { { 0 } };
- struct mmap_align mma;
- int ret;
-
- float_lock();
- switch (float_declaration->mantissa->len + 1) {
- case FLT_MANT_DIG:
- tmpdef = static_float_declaration->p.definition_new(
- &static_float_declaration->p,
- NULL, 0, 0, "__tmpfloat");
- break;
- case DBL_MANT_DIG:
- tmpdef = static_double_declaration->p.definition_new(
- &static_double_declaration->p,
- NULL, 0, 0, "__tmpfloat");
- break;
- default:
- ret = -EINVAL;
- goto end;
- }
- tmpfloat = container_of(tmpdef, struct definition_float, p);
- ctf_init_pos(&srcp, NULL, -1, O_RDONLY);
- mmap_align_set_addr(&mma, (char *) u.bits);
- srcp.base_mma = &mma;
- srcp.content_size = srcp.packet_size = sizeof(u) * CHAR_BIT;
- switch (float_declaration->mantissa->len + 1) {
- case FLT_MANT_DIG:
- u.vf = float_definition->value;
- break;
- case DBL_MANT_DIG:
- u.vd = float_definition->value;
- break;
- default:
- ret = -EINVAL;
- goto end_unref;
- }
- if (!ctf_align_pos(pos, float_declaration->p.alignment)) {
- ret = -EFAULT;
- goto end_unref;
- }
- ret = _ctf_float_copy(ppos, float_definition, &srcp.parent, tmpfloat);
-
-end_unref:
- bt_definition_unref(tmpdef);
-end:
- float_unlock();
- return ret;
-}
-
-double bt_get_float(const struct bt_definition *field)
-{
- struct definition_float *definition =
- container_of(field, struct definition_float, p);
-
- return definition->value;
-}
-
-static
-void __attribute__((constructor)) ctf_float_init(void)
-{
- static_float_declaration =
- bt_float_declaration_new(FLT_MANT_DIG,
- sizeof(float) * CHAR_BIT - FLT_MANT_DIG,
- BYTE_ORDER,
- __alignof__(float));
- static_double_declaration =
- bt_float_declaration_new(DBL_MANT_DIG,
- sizeof(double) * CHAR_BIT - DBL_MANT_DIG,
- BYTE_ORDER,
- __alignof__(double));
-}
-
-static
-void __attribute__((destructor)) ctf_float_fini(void)
-{
- bt_declaration_unref(&static_float_declaration->p);
- bt_declaration_unref(&static_double_declaration->p);
-}
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