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Add test of bit-field packing for #1054 and #1055

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Jesse Rosenstock 2020-06-27 20:30:08 +02:00 committed by Oliver Schmidt
parent 6dc2bf1226
commit a70ac6be30
1 changed files with 124 additions and 0 deletions
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test/val/bitfield.c Normal file
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/*
!!DESCRIPTION!! Tests of bit-field packing
!!ORIGIN!! cc65 regression tests
!!LICENCE!! zlib
!!AUTHOR!! Jesse Rosenstock
*/
/*
see https://github.com/cc65/cc65/issues/1054
*/
#include <stdio.h>
static unsigned char failures = 0;
static struct four_bits {
unsigned int x : 4;
} fb = {1};
static void test_four_bits(void)
{
if (sizeof(struct four_bits) != 1) {
fprintf(stderr, "Got sizeof(struct four_bits) = %zu, expected 1.\n",
sizeof(struct four_bits));
failures++;
}
if (fb.x != 1) {
fprintf(stderr, "Got fb.x = %u, expected 1.\n", fb.x);
failures++;
}
fb.x = 3;
if (fb.x != 3) {
fprintf(stderr, "Got fb.x = %u, expected 3.\n", fb.x);
failures++;
}
}
static struct four_bits_with_int {
unsigned int x : 4;
unsigned int y;
} fbi = {1, 2};
static void test_four_bits_with_int(void)
{
/* We would like this to be 3. https://github.com/cc65/cc65/issues/1054 */
if (sizeof(struct four_bits_with_int) != 4) {
fprintf(stderr,
"Got sizeof(struct four_bits_with_int) = %zu, expected 4.\n",
sizeof(struct four_bits_with_int));
failures++;
}
if (fbi.x != 1) {
fprintf(stderr, "Got fbi.x = %u, expected 1.\n", fbi.x);
failures++;
}
if (fbi.y != 2) {
fprintf(stderr, "Got fbi.y = %u, expected 2.\n", fbi.y);
failures++;
}
fbi.x = 3;
fbi.y = 17;
if (fbi.x != 3) {
fprintf(stderr, "Got fbi.x = %u, expected 3.\n", fbi.x);
failures++;
}
if (fbi.y != 17) {
fprintf(stderr, "Got fbi.y = %u, expected 17.\n", fbi.y);
failures++;
}
}
static struct overlap {
unsigned int x : 10;
unsigned int y : 10;
} o = {11, 22};
/* Tests that bit-fields can share allocation units. */
static void test_overlap(void)
{
if (sizeof(struct overlap) != 3) {
fprintf(stderr, "Got sizeof(struct overlap) = %zu, expected 3.\n",
sizeof(struct overlap));
failures++;
}
if (o.x != 11) {
fprintf(stderr, "Got o.x = %u, expected 11.\n", o.x);
failures++;
}
if (o.y != 22) {
fprintf(stderr, "Got o.y = %u, expected 22.\n", o.y);
failures++;
}
o.x = 33;
o.y = 44;
if (o.x != 33) {
fprintf(stderr, "Got o.x = %u, expected 33.\n", o.x);
failures++;
}
if (o.y != 44) {
fprintf(stderr, "Got o.y = %u, expected 44.\n", o.y);
failures++;
}
}
int main(void)
{
test_four_bits();
test_four_bits_with_int();
test_overlap();
return failures;
}