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These are not required to be supported (only int, signed int, and unsigned int are required), but most compilers support it. https://port70.net/~nsz/c/c89/c89-draft.html#3.5.2.1 https://port70.net/~nsz/c/c89/c89-draft.html#A.6.5.8 For consistency with other integral types, plain `char` bit-fields are unsigned, regardless of the `--signed-chars` option. Fixes #1047
281 lines
6.2 KiB
C
281 lines
6.2 KiB
C
/*
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Copyright 2020 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-fields; see 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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static struct four_bits {
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unsigned char 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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static struct four_bits_signed {
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signed char x : 4;
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} fbs = {1};
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static void test_four_bits_signed (void)
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{
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if (sizeof (struct four_bits_signed) != 1) {
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printf ("Got sizeof (struct four_bits_signed) = %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 (fbs.x != 1) {
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printf ("Got fbs.x = %d, expected 1.\n", fbs.x);
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failures++;
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}
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fbs.x = 3;
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if (fbs.x != 3) {
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printf ("Got fbs.x = %d, expected 3.\n", fbs.x);
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failures++;
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}
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}
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static struct four_bits_plain {
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char x : 4;
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} fbp = {1};
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static void test_four_bits_plain (void)
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{
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if (sizeof (struct four_bits_plain) != 1) {
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printf ("Got sizeof (struct four_bits_plain) = %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 (fbp.x != 1) {
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printf ("Got fbp.x = %d, expected 1.\n", fbp.x);
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failures++;
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}
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fbp.x = 3;
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if (fbp.x != 3) {
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printf ("Got fbp.x = %d, expected 3.\n", fbp.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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unsigned char x : 4;
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unsigned char 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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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 two_chars {
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unsigned char x : 4;
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unsigned char y : 4;
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} o = {11, 7};
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/* Tests that bit-fields can share allocation units. */
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static void test_two_chars (void)
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{
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if (sizeof (struct two_chars) != 1) {
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printf ("Got sizeof (struct two_chars) = %zu, expected 1.\n",
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sizeof (struct two_chars));
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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 != 7) {
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printf ("Got o.y = %u, expected 7.\n", o.y);
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failures++;
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}
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o.x = 3;
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o.y = 4;
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if (o.x != 3) {
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printf ("Got o.x = %u, expected 3.\n", o.x);
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failures++;
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}
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if (o.y != 4) {
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printf ("Got o.y = %u, expected 4.\n", o.y);
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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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unsigned char x : 8;
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} fw = {255};
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static void test_full_width (void)
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{
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if (sizeof (struct full_width) != 1) {
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printf ("Got sizeof (struct full_width) = %zu, expected 1.\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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fw.x = 42;
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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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}
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static struct aligned_end {
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unsigned char : 2;
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unsigned char x : 6;
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unsigned char : 3;
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unsigned char y : 5;
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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) != 2) {
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printf ("Got sizeof (struct aligned_end) = %zu, expected 2.\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 = 15;
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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 != 15) {
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printf ("Got ae.y = %u, expected 15.\n", ae.y);
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failures++;
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}
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}
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struct { signed char x : 1; } sc = {-1};
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struct { unsigned char x : 1; } uc = {1};
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struct { char x : 1; } pc = {1};
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static void test_signedness (void)
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{
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if (sc.x != -1) {
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printf ("Got sc.x = %d, expected -1.\n", sc.x);
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failures++;
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}
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if (uc.x != 1) {
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printf ("Got uc.x = %u, expected 1.\n", uc.x);
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failures++;
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}
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if (pc.x != 1) {
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printf ("Got pc.x = %u, expected 1.\n", pc.x);
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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_two_chars ();
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test_full_width ();
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test_aligned_end ();
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test_signedness ();
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printf ("failures: %u\n", failures);
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return failures;
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}
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