--- /dev/null
+/*
+ * test-bitfield.c
+ *
+ * BabelTrace - bitfield test program
+ *
+ * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define _GNU_SOURCE
+#include <babeltrace/bitfield.h>
+#include <time.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <tap/tap.h>
+
+unsigned int glob;
+
+/*
+ * This function is only declared to show the size of a bitfield write in
+ * objdump.
+ */
+void fct(void)
+{
+ bt_bitfield_write(&glob, unsigned int, 12, 15, 0x12345678);
+}
+
+/* Test array size, in bytes */
+#define TEST_LEN 128
+#define NR_TESTS 10
+#define SIGNED_TEST_DESC_FMT_STR "Writing and reading back 0x%X, signed"
+#define UNSIGNED_TEST_DESC_FMT_STR "Writing and reading back 0x%X, unsigned"
+#define DIAG_FMT_STR "Failed reading value written \"%s\"-wise, with start=%i" \
+ " and length=%i. Read %llX"
+
+unsigned int srcrand;
+
+#if defined(__i386) || defined(__x86_64)
+
+static inline int fls(int x)
+{
+ int r;
+ asm("bsrl %1,%0\n\t"
+ "cmovzl %2,%0"
+ : "=&r" (r) : "rm" (x), "rm" (-1));
+ return r + 1;
+}
+
+#elif defined(__PPC__)
+
+static __inline__ int fls(unsigned int x)
+{
+ int lz;
+
+ asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
+ return 32 - lz;
+}
+
+#else
+
+static int fls(unsigned int x)
+{
+ int r = 32;
+
+ if (!x)
+ return 0;
+ if (!(x & 0xFFFF0000U)) {
+ x <<= 16;
+ r -= 16;
+ }
+ if (!(x & 0xFF000000U)) {
+ x <<= 8;
+ r -= 8;
+ }
+ if (!(x & 0xF0000000U)) {
+ x <<= 4;
+ r -= 4;
+ }
+ if (!(x & 0xC0000000U)) {
+ x <<= 2;
+ r -= 2;
+ }
+ if (!(x & 0x80000000U)) {
+ x <<= 1;
+ r -= 1;
+ }
+ return r;
+}
+
+#endif
+
+#define print_byte_array(c, len) \
+do { \
+ unsigned long i; \
+ \
+ for (i = 0; i < (len); i++) { \
+ printf("0x%X", (c)[i]); \
+ if (i != (len) - 1) \
+ printf(" "); \
+ } \
+ printf("\n"); \
+} while (0)
+
+#define init_byte_array(c, len, val) \
+do { \
+ unsigned long i; \
+ \
+ for (i = 0; i < (len); i++) \
+ (c)[i] = (val); \
+} while (0)
+
+#define check_result(ref, val, buffer, typename, start, len, \
+ desc_fmt_str) \
+({ \
+ if ((val) != (ref)) { \
+ fail(desc_fmt_str, ref); \
+ diag(DIAG_FMT_STR, #typename, start, len, val); \
+ printf("# "); \
+ print_byte_array(buffer, TEST_LEN); \
+ } \
+ (val) != (ref); \
+})
+
+void run_test_unsigned(void)
+{
+ unsigned int src, nrbits;
+ union {
+ unsigned char c[TEST_LEN];
+ unsigned short s[TEST_LEN/sizeof(unsigned short)];
+ unsigned int i[TEST_LEN/sizeof(unsigned int)];
+ unsigned long l[TEST_LEN/sizeof(unsigned long)];
+ unsigned long long ll[TEST_LEN/sizeof(unsigned long long)];
+ } target;
+ unsigned long long readval;
+ unsigned int s, l;
+
+ src = srcrand;
+ nrbits = fls(src);
+
+ for (s = 0; s < CHAR_BIT * TEST_LEN; s++) {
+ for (l = nrbits; l < (CHAR_BIT * TEST_LEN) - s; l++) {
+ init_byte_array(target.c, TEST_LEN, 0xFF);
+ bt_bitfield_write(target.c, unsigned char, s, l, src);
+ bt_bitfield_read(target.c, unsigned char, s, l, &readval);
+ if (check_result(src, readval, target.c, unsigned char,
+ s, l, UNSIGNED_TEST_DESC_FMT_STR)) {
+ return;
+ }
+
+ init_byte_array(target.c, TEST_LEN, 0xFF);
+ bt_bitfield_write(target.s, unsigned short, s, l, src);
+ bt_bitfield_read(target.c, unsigned char, s, l, &readval);
+ if (check_result(src, readval, target.c, unsigned short,
+ s, l, UNSIGNED_TEST_DESC_FMT_STR)) {
+ return;
+ }
+
+ init_byte_array(target.c, TEST_LEN, 0xFF);
+ bt_bitfield_write(target.i, unsigned int, s, l, src);
+ bt_bitfield_read(target.c, unsigned char, s, l, &readval);
+ if (check_result(src, readval, target.c, unsigned int,
+ s, l, UNSIGNED_TEST_DESC_FMT_STR)) {
+ return;
+ }
+
+ init_byte_array(target.c, TEST_LEN, 0xFF);
+ bt_bitfield_write(target.l, unsigned long, s, l, src);
+ bt_bitfield_read(target.c, unsigned char, s, l, &readval);
+ if (check_result(src, readval, target.c, unsigned long,
+ s, l, UNSIGNED_TEST_DESC_FMT_STR)) {
+ return;
+ }
+
+ init_byte_array(target.c, TEST_LEN, 0xFF);
+ bt_bitfield_write(target.ll, unsigned long long, s, l, src);
+ bt_bitfield_read(target.c, unsigned char, s, l, &readval);
+ if (check_result(src, readval, target.c, unsigned long long,
+ s, l, UNSIGNED_TEST_DESC_FMT_STR)) {
+ return;
+ }
+ }
+ }
+
+ pass(UNSIGNED_TEST_DESC_FMT_STR, src);
+}
+
+void run_test_signed(void)
+{
+ int src, nrbits;
+ union {
+ signed char c[TEST_LEN];
+ short s[TEST_LEN/sizeof(short)];
+ int i[TEST_LEN/sizeof(int)];
+ long l[TEST_LEN/sizeof(long)];
+ long long ll[TEST_LEN/sizeof(long long)];
+ } target;
+ long long readval;
+ unsigned int s, l;
+
+ src = srcrand;
+ if (src & 0x80000000U)
+ nrbits = fls(~src) + 1; /* Find least significant bit conveying sign */
+ else
+ nrbits = fls(src) + 1; /* Keep sign at 0 */
+
+ for (s = 0; s < CHAR_BIT * TEST_LEN; s++) {
+ for (l = nrbits; l < (CHAR_BIT * TEST_LEN) - s; l++) {
+ init_byte_array(target.c, TEST_LEN, 0x0);
+ bt_bitfield_write(target.c, signed char, s, l, src);
+ bt_bitfield_read(target.c, signed char, s, l, &readval);
+ if (check_result(src, readval, target.c, signed char,
+ s, l, SIGNED_TEST_DESC_FMT_STR)) {
+ return;
+ }
+
+ init_byte_array(target.c, TEST_LEN, 0x0);
+ bt_bitfield_write(target.s, short, s, l, src);
+ bt_bitfield_read(target.c, signed char, s, l, &readval);
+ if (check_result(src, readval, target.c, short,
+ s, l, SIGNED_TEST_DESC_FMT_STR)) {
+ return;
+ }
+
+ init_byte_array(target.c, TEST_LEN, 0x0);
+ bt_bitfield_write(target.i, int, s, l, src);
+ bt_bitfield_read(target.c, signed char, s, l, &readval);
+ if (check_result(src, readval, target.c, int,
+ s, l, SIGNED_TEST_DESC_FMT_STR)) {
+ return;
+ }
+
+ init_byte_array(target.c, TEST_LEN, 0x0);
+ bt_bitfield_write(target.l, long, s, l, src);
+ bt_bitfield_read(target.c, signed char, s, l, &readval);
+ if (check_result(src, readval, target.c, long,
+ s, l, SIGNED_TEST_DESC_FMT_STR)) {
+ return;
+ }
+
+ init_byte_array(target.c, TEST_LEN, 0x0);
+ bt_bitfield_write(target.ll, long long, s, l, src);
+ bt_bitfield_read(target.c, signed char, s, l, &readval);
+ if (check_result(src, readval, target.c, long long,
+ s, l, SIGNED_TEST_DESC_FMT_STR)) {
+ return;
+ }
+ }
+ }
+
+ pass(SIGNED_TEST_DESC_FMT_STR, src);
+}
+
+void run_test(void)
+{
+ int i;
+ plan_tests(NR_TESTS * 2 + 6);
+
+ srand(time(NULL));
+
+ srcrand = 0;
+ run_test_unsigned();
+ srcrand = 0;
+ run_test_signed();
+
+ srcrand = 1;
+ run_test_unsigned();
+
+ srcrand = ~0U;
+ run_test_unsigned();
+
+ srcrand = -1;
+ run_test_signed();
+
+ srcrand = (int)0x80000000U;
+ run_test_signed();
+
+ for (i = 0; i < NR_TESTS; i++) {
+ srcrand = rand();
+ run_test_unsigned();
+ run_test_signed();
+ }
+}
+
+static
+int print_encodings(unsigned long src, unsigned int shift, unsigned int len)
+{
+ union {
+ unsigned char c[8];
+ unsigned short s[4];
+ unsigned int i[2];
+ unsigned long l[2];
+ unsigned long long ll[1];
+ } target;
+ unsigned long long readval;
+
+ init_byte_array(target.c, 8, 0xFF);
+ bt_bitfield_write(target.c, unsigned char, shift, len, src);
+ printf("bytewise\n");
+ print_byte_array(target.c, 8);
+
+ init_byte_array(target.c, 8, 0xFF);
+ bt_bitfield_write(target.s, unsigned short, shift, len, src);
+ printf("shortwise\n");
+ print_byte_array(target.c, 8);
+
+ init_byte_array(target.c, 8, 0xFF);
+ bt_bitfield_write(target.i, unsigned int, shift, len, src);
+ printf("intwise\n");
+ print_byte_array(target.c, 8);
+
+ init_byte_array(target.c, 8, 0xFF);
+ bt_bitfield_write(target.l, unsigned long, shift, len, src);
+ printf("longwise\n");
+ print_byte_array(target.c, 8);
+
+ init_byte_array(target.c, 8, 0xFF);
+ bt_bitfield_write(target.ll, unsigned long long, shift, len, src);
+ printf("lluwise\n");
+ print_byte_array(target.c, 8);
+
+ bt_bitfield_read(target.c, unsigned char, shift, len, &readval);
+ printf("read: %llX\n", readval);
+ print_byte_array(target.c, 8);
+
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ if (argc > 1) {
+ /* Print encodings */
+ unsigned long src;
+ unsigned int shift, len;
+
+ src = atoi(argv[1]);
+ if (argc > 2)
+ shift = atoi(argv[2]);
+ else
+ shift = 12;
+ if (argc > 3)
+ len = atoi(argv[3]);
+ else
+ len = 40;
+ return print_encodings(src, shift, len);
+ }
+
+ /* Run tap-formated tests */
+ run_test();
+ return exit_status();
+}
projects / babeltrace.git / blobdiff