mirror of
https://github.com/cc65/cc65.git
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125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
/*
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!!DESCRIPTION!! Tests of bit-field packing
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!!ORIGIN!! cc65 regression tests
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!!LICENCE!! zlib
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!!AUTHOR!! Jesse Rosenstock
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*/
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/*
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see https://github.com/cc65/cc65/issues/1054
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*/
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#include <stdio.h>
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static unsigned char failures = 0;
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static struct four_bits {
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unsigned int x : 4;
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} fb = {1};
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static void test_four_bits(void)
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{
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if (sizeof(struct four_bits) != 1) {
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fprintf(stderr, "Got sizeof(struct four_bits) = %zu, expected 1.\n",
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sizeof(struct four_bits));
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failures++;
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}
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if (fb.x != 1) {
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fprintf(stderr, "Got fb.x = %u, expected 1.\n", fb.x);
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failures++;
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}
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fb.x = 3;
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if (fb.x != 3) {
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fprintf(stderr, "Got fb.x = %u, expected 3.\n", fb.x);
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failures++;
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}
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}
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static struct four_bits_with_int {
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unsigned int x : 4;
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unsigned int y;
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} fbi = {1, 2};
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static void test_four_bits_with_int(void)
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{
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/* We would like this to be 3. https://github.com/cc65/cc65/issues/1054 */
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if (sizeof(struct four_bits_with_int) != 4) {
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fprintf(stderr,
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"Got sizeof(struct four_bits_with_int) = %zu, expected 4.\n",
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sizeof(struct four_bits_with_int));
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failures++;
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}
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if (fbi.x != 1) {
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fprintf(stderr, "Got fbi.x = %u, expected 1.\n", fbi.x);
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failures++;
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}
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if (fbi.y != 2) {
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fprintf(stderr, "Got fbi.y = %u, expected 2.\n", fbi.y);
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failures++;
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}
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fbi.x = 3;
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fbi.y = 17;
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if (fbi.x != 3) {
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fprintf(stderr, "Got fbi.x = %u, expected 3.\n", fbi.x);
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failures++;
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}
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if (fbi.y != 17) {
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fprintf(stderr, "Got fbi.y = %u, expected 17.\n", fbi.y);
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failures++;
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}
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}
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static struct overlap {
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unsigned int x : 10;
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unsigned int y : 10;
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} o = {11, 22};
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/* Tests that bit-fields can share allocation units. */
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static void test_overlap(void)
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{
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if (sizeof(struct overlap) != 3) {
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fprintf(stderr, "Got sizeof(struct overlap) = %zu, expected 3.\n",
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sizeof(struct overlap));
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failures++;
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}
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if (o.x != 11) {
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fprintf(stderr, "Got o.x = %u, expected 11.\n", o.x);
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failures++;
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}
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if (o.y != 22) {
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fprintf(stderr, "Got o.y = %u, expected 22.\n", o.y);
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failures++;
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}
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o.x = 33;
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o.y = 44;
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if (o.x != 33) {
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fprintf(stderr, "Got o.x = %u, expected 33.\n", o.x);
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failures++;
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}
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if (o.y != 44) {
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fprintf(stderr, "Got o.y = %u, expected 44.\n", o.y);
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failures++;
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}
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}
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int main(void)
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{
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test_four_bits();
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test_four_bits_with_int();
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test_overlap();
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return failures;
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}
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