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[nrf fromlist] sys: util_macro: Add CASE_IF_ENABLED and CASE_IF_ENABLED_<ALL/ANY>
-Added macro CASE_IF_ENABLED to emit a case in a switch-statement if the given flag is define to 1. -Added macro CASE_IF_ENABLED_ALL to emit code if all flags are defined to 1, otherwise an empty token is emitted. -Added macro CASE_IF_ENABLED_ANY to emit a case code if any flags are defined to 1, otherwise an empty token is emitted. -Added unit tests for CASE_IF_ENABLED, CASE_IF_ENABLED_ALL, CASE_IF_ENABLED_ANY These macros utilize the same strategy as the IF_ENABLED macro Signed-off-by: Frank Audun Kvamtrø <[email protected]> (cherry picked from commit 4ee6ef8708d0126afe9f990b505222e6529bc687)
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‎include/zephyr/sys/util_internal.h‎

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@@ -376,6 +376,18 @@
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#define MACRO_MC_14(m, a, ...) UTIL_CAT(m(a), MACRO_MC_13(m, __VA_ARGS__,))
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#define MACRO_MC_15(m, a, ...) UTIL_CAT(m(a), MACRO_MC_14(m, __VA_ARGS__,))
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379+
/* Used by CASE_IF_ENABLED */
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#define Z_CASE_IF_ENABLED(_flag, _label, ...) \
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Z_CASE_IF_ENABLED_ALL((_flag), _label, __VA_ARGS__)
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/* Used by CASE_IF_ENABLED_ALL */
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#define Z_CASE_IF_ENABLED_ALL(_flags, _label, ...) \
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Z_IF_ENABLED_ALL((case _label: { __VA_ARGS__ }), __DEBRACKET _flags)
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/* Used by CASE_IF_ENABLED_ANY */
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#define Z_CASE_IF_ENABLED_ANY(_flags, _label, ...) \
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Z_IF_ENABLED_ANY((case _label: { __VA_ARGS__ }), __DEBRACKET _flags)
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/* Used by Z_IS_EQ */
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#include "util_internal_is_eq.h"
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‎include/zephyr/sys/util_macro.h‎

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@@ -803,6 +803,167 @@ extern "C" {
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*/
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#define MACRO_MAP_CAT_N(N, ...) MACRO_MAP_CAT_N_(N, __VA_ARGS__)
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/**
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* @brief Macro to emit a case in a switch-statement if the @p _flag is
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* defined to 1
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*
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* @note The content will only be emitted if a the configuration is
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* defined to 1, otherwise the whole case in the switch will
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* be expressed as an empty token. This means that the content will
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* only compiled and error-checked when the checked configurations yields
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* an emitted case in the switch-statement.
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*
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* Example:
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*
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* enum { CASE_FOO = 1 };
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*
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* switch(some_var) {
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* CASE_IF_ENABLED(CONFIG_FOO, CASE_FOO,
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* a++;
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* b++;
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* break;
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* )
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* default:
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* return -EIO;
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* }
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*
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* This will emit the following if @p CONFIG_FOO is defined to 1:
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*
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* switch (some_var) {
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* case CASE_FOO: {
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* a++;
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* b++;
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* break;
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* }
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* default:
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* return -EIO;
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* }
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*
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* Otherwise it will emit the following:
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*
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* switch (some_var) {
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* default:
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* return -EIO;
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* }
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*
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* @param _flag Configuration to check
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* @param _label Label to emit in switch-statement
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* @param ... Content of the case
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*
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* @return Case with label and content if @p _flag is enabled and set 1,
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* otherwise an empty token
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*/
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#define CASE_IF_ENABLED(_flag, _label, ...) \
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Z_CASE_IF_ENABLED(_flag, _label, __VA_ARGS__)
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/**
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* @brief Macro to emit a case in a switch-statement if a list of @p _flags
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* are all defined to 1
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*
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* @note The content will only be emitted if all @p _flags are defined and
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* set to 1, otherwise the whole case in the switch will be expressed
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* as an empty token. This means that the content will only compiled and
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* error-checked when the checked configurations yields an emitted case
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* in the switch-statement.
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*
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* Example:
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*
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* enum { CASE_FOO = 1 };
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*
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* switch(some_var) {
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* CASE_IF_ENABLED(CONFIG_FOO, CONFIG_BAR, CASE_FOO,
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* a++;
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* b++;
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* break;
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* )
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* default:
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* return -EIO;
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* }
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*
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* Will emit the following if both @p CONFIG_FOO and @p CONFIG_BAR are defined
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* to 1:
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*
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* switch (some_var) {
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* case CASE_FOO: {
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* a++;
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* b++;
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* break;
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* }
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* default:
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* return -EIO;
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* }
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*
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* Otherwise it will emit the following:
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*
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* switch (some_var) {
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* default:
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* return -EIO;
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* }
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*
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* @param _flags Configurations to check; must be in parentheses
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* @param _label Label to emit in switch-statement
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* @param ... Content of the case
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*
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* @return Case with label and content if all @p _flags are enabled and set 1,
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* otherwise an empty token
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*/
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#define CASE_IF_ENABLED_ALL(_flags, _label, ...) \
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Z_CASE_IF_ENABLED_ALL(_flags, _label, __VA_ARGS__)
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/**
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* @brief Macro to emit a case in a switch-statement if any @p _flags are
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* defined to 1
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*
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* @note The content will only be emitted if any @p _flags are defined to 1,
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* otherwise the whole case in the switch will be expressed as an
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* empty token. This means that the content will only compiled and
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* error-checked when the checked configurations yields an emitted case in
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* the switch-statement.
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*
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* Example:
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*
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* enum { CASE_FOO = 1 };
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*
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* switch(some_var) {
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* CASE_IF_ENABLED_ANY((CONFIG_FOO, CONFIG_BAR), CASE_FOO,
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* a++;
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* b++;
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* break;
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* )
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* default:
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* return -EIO;
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* }
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*
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* This will emit the following if any of the configurations @p CONFIG_FOO,
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* @p CONFIG_BAR are defined to 1:
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*
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* switch (some_var) {
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* case CASE_FOO: {
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* a++;
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* b++;
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* break;
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* }
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* default:
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* return -EIO;
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* }
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*
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* Otherwise it will emit the following:
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*
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* switch (som_var) {
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* default:
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* return -EIO;
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* }
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*
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* @param _flags Configurations to check; must be in parentheses
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* @param _label Label to emit in switch-statement
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* @param ... Content of the case
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*
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* @return Case with label and content if any @p _flags are enabled and set 1,
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* otherwise an empty token
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*/
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#define CASE_IF_ENABLED_ANY(_flags, _label, ...) \
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Z_CASE_IF_ENABLED_ANY(_flags, _label, __VA_ARGS__)
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/**
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* @}
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*/

‎tests/unit/util/main.c‎

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@@ -377,6 +377,143 @@ ZTEST(util, test_IF_ENABLED_ANY) {
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#undef TEST_FLAG_D
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}
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ZTEST(util, test_CASE_IF_ENABLED) {
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#define TEST_FLAG_A 1
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#define TEST_FLAG_B 0
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#define TEST_LABEL_SUCCESS 1
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#define TEST_LABEL_FAILURE 2
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int a = TEST_LABEL_SUCCESS;
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switch (a) {
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CASE_IF_ENABLED(TEST_FLAG_A, TEST_LABEL_SUCCESS,
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break;
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)
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default:
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zassert_false(true, "CASE_IF_ENABLED not emitted (default reached)");
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break;
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}
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a = TEST_LABEL_FAILURE;
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switch (a) {
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CASE_IF_ENABLED(TEST_FLAG_B, TEST_LABEL_FAILURE,
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zassert_false(true, "CASE_IF_ENABLED emitted (invalid case)");
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break;
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)
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default:
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break;
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}
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zassert_true(true, "");
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#undef TEST_FLAG_A
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#undef TEST_FLAG_B
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#undef TEST_LABEL_SUCCESS
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#undef TEST_LABEL_FAILURE
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}
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ZTEST(util, test_CASE_IF_ENABLED_ALL) {
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#define TEST_FLAG_A 1
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#define TEST_FLAG_B 1
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#define TEST_FLAG_C 0
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#define TEST_FLAG_D 0
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#define TEST_LABEL_SUCCESS 1
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#define TEST_LABEL_FAILURE 2
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int a = TEST_LABEL_SUCCESS;
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switch (a) {
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CASE_IF_ENABLED_ALL((TEST_FLAG_A, TEST_FLAG_B), TEST_LABEL_SUCCESS,
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break;
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)
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default:
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zassert_false(true,
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"CASE_IF_ENABLED_ALL not emitted (all valid)");
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break;
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}
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a = TEST_LABEL_FAILURE;
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switch (a) {
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CASE_IF_ENABLED_ALL((TEST_FLAG_A, TEST_FLAG_C), TEST_LABEL_FAILURE,
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zassert_false(true,
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"CASE_IF_ENABLED_ALL should not emit (one invalid)");
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break;
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)
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default:
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break;
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}
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a = TEST_LABEL_FAILURE;
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switch (a) {
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CASE_IF_ENABLED_ALL((TEST_FLAG_C, TEST_FLAG_D), TEST_LABEL_FAILURE,
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zassert_false(true, "CASE_IF_ENABLED_ALL should not emit");
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break;
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)
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default:
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break;
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}
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zassert_true(true, "");
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#undef TEST_FLAG_A
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#undef TEST_FLAG_B
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#undef TEST_FLAG_C
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#undef TEST_FLAG_D
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#undef TEST_LABEL_SUCCESS
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#undef TEST_LABEL_FAILURE
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}
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ZTEST(util, test_CASE_IF_ENABLED_ANY) {
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#define TEST_FLAG_A 1
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#define TEST_FLAG_B 1
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#define TEST_FLAG_C 0
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#define TEST_FLAG_D 0
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#define TEST_LABEL_SUCCESS 1
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#define TEST_LABEL_FAILURE 2
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int a = TEST_LABEL_SUCCESS;
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switch (a) {
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CASE_IF_ENABLED_ANY((TEST_FLAG_A, TEST_FLAG_B), TEST_LABEL_SUCCESS,
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break;
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)
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default:
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zassert_false(true, "CASE_IF_ENABLED_ANY not emitted (all valid)");
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break;
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}
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a = TEST_LABEL_SUCCESS;
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switch (a) {
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CASE_IF_ENABLED_ANY((TEST_FLAG_A, TEST_FLAG_C), TEST_LABEL_SUCCESS,
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break;
490+
)
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default:
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zassert_false(true, "CASE_IF_ENABLED_ANY not emitted (one valid)");
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break;
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}
495+
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a = TEST_LABEL_FAILURE;
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switch (a) {
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CASE_IF_ENABLED_ANY((TEST_FLAG_C, TEST_FLAG_D),
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TEST_LABEL_FAILURE,
500+
zassert_false(true, "CASE_IF_ENABLED_ANY should not emit");
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break;
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)
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default:
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break;
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}
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507+
zassert_true(true, "");
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509+
#undef TEST_FLAG_A
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#undef TEST_FLAG_B
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#undef TEST_FLAG_C
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#undef TEST_FLAG_D
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#undef TEST_LABEL_SUCCESS
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#undef TEST_LABEL_FAILURE
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}
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380517
ZTEST(util, test_LISTIFY) {
381518
int ab0 = 1;
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int ab1 = 1;

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