mirror of https://github.com/cc65/cc65.git
279 lines
6.3 KiB
C
279 lines
6.3 KiB
C
/*
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Copyright 2020-2022 The cc65 Authors
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/*
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Tests of char bit-field packing and typedef works with them; see issues below
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- packing issue: https://github.com/cc65/cc65/issues/1054
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- typedef issue: https://github.com/cc65/cc65/pull/1662
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- char bit-field support: https://github.com/cc65/cc65/issues/1047
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*/
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#include <stdio.h>
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static unsigned char failures = 0;
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typedef unsigned char field_type;
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static struct four_bits {
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field_type 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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printf("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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printf("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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printf("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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/*
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Logic is somewhat diferent for bit-fields that end a struct vs
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having additional fields.
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*/
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static struct four_bits_with_char {
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field_type x : 4;
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field_type y;
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} fbi = {1, 2};
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static void test_four_bits_with_char(void)
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{
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/* The first 4-bit bit-field just takes one byte, so the size is 2. */
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if (sizeof(struct four_bits_with_char) != 2) {
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printf("Got sizeof(struct four_bits_with_char) = %zu, expected 2.\n",
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sizeof(struct four_bits_with_char));
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failures++;
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}
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if (fbi.x != 1) {
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printf("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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printf("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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printf("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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printf("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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field_type x : 6;
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field_type y : 6;
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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) != 2) {
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printf("Got sizeof(struct overlap) = %zu, expected 2.\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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printf("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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printf("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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printf("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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printf("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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static struct overlap_with_char {
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field_type x : 6;
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field_type y : 6;
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field_type z;
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} oi = {11, 22, 33};
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static void test_overlap_with_char(void)
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{
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/* First two fields in 2 bytes, then another 1 byte. */
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if (sizeof(struct overlap_with_char) != 3) {
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printf("Got sizeof(struct overlap_with_char) = %zu, expected 3.\n",
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sizeof(struct overlap_with_char));
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failures++;
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}
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if (oi.x != 11) {
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printf("Got oi.x = %u, expected 11.\n", oi.x);
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failures++;
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}
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if (oi.y != 22) {
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printf("Got oi.y = %u, expected 22.\n", oi.y);
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failures++;
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}
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if (oi.z != 33) {
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printf("Got oi.z = %u, expected 33.\n", oi.z);
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failures++;
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}
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oi.x = 44;
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oi.y = 55;
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oi.z = 66;
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if (oi.x != 44) {
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printf("Got oi.x = %u, expected 44.\n", oi.x);
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failures++;
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}
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if (oi.y != 55) {
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printf("Got oi.y = %u, expected 55.\n", oi.y);
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failures++;
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}
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if (oi.z != 66) {
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printf("Got oi.z = %u, expected 66.\n", oi.z);
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failures++;
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}
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}
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static struct full_width {
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field_type x : 8;
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field_type y : 8;
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} fw = {255, 17};
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static void test_full_width(void)
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{
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if (sizeof(struct full_width) != 2) {
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printf("Got sizeof(struct full_width) = %zu, expected 2.\n",
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sizeof(struct full_width));
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failures++;
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}
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if (fw.x != 255) {
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printf("Got fw.x = %u, expected 255.\n", fw.x);
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failures++;
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}
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if (fw.y != 17) {
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printf("Got fw.y = %u, expected 17.\n", fw.y);
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failures++;
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}
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fw.x = 42;
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fw.y = 255;
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if (fw.x != 42) {
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printf("Got fw.x = %u, expected 42.\n", fw.x);
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failures++;
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}
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if (fw.y != 255) {
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printf("Got fw.y = %u, expected 255.\n", fw.y);
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failures++;
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}
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}
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static struct aligned_end {
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field_type : 2;
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field_type x : 6;
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/* y crosses a byte boundary, but fits in a byte when shifted. */
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field_type : 6;
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field_type y : 7;
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} ae = {63, 17};
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static void test_aligned_end(void)
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{
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if (sizeof(struct aligned_end) != 3) {
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printf("Got sizeof(struct aligned_end) = %zu, expected 3.\n",
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sizeof(struct aligned_end));
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failures++;
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}
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if (ae.x != 63) {
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printf("Got ae.x = %u, expected 63.\n", ae.x);
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failures++;
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}
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if (ae.y != 17) {
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printf("Got ae.y = %u, expected 17.\n", ae.y);
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failures++;
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}
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ae.x = 42;
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ae.y = 127;
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if (ae.x != 42) {
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printf("Got ae.x = %u, expected 42.\n", ae.x);
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failures++;
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}
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if (ae.y != 127) {
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printf("Got ae.y = %u, expected 127.\n", ae.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_char();
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test_overlap();
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test_overlap_with_char();
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test_full_width();
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test_aligned_end();
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printf("failures: %u\n", failures);
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return failures;
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}
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