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Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the + library `Frob' (a library for tweaking knobs) written by James + Random Hacker. + + <signature of Ty Coon>, 1 April 1990 + Ty Coon, President of Vice + +That's all there is to it! diff --git a/lib/ccan/typesafe_cb/_info b/lib/ccan/typesafe_cb/_info new file mode 100644 index 0000000000..4f4570afc9 --- /dev/null +++ b/lib/ccan/typesafe_cb/_info @@ -0,0 +1,151 @@ +#include <stdio.h> +#include <string.h> +#include "config.h" + +/** + * typesafe_cb - macros for safe callbacks. + * + * The basis of the typesafe_cb header is typesafe_cb_cast(): a + * conditional cast macro. If an expression exactly matches a given + * type, it is cast to the target type, otherwise it is left alone. + * + * This allows us to create functions which take a small number of + * specific types, rather than being forced to use a void *. In + * particular, it is useful for creating typesafe callbacks as the + * helpers typesafe_cb(), typesafe_cb_preargs() and + * typesafe_cb_postargs() demonstrate. + * + * The standard way of passing arguments to callback functions in C is + * to use a void pointer, which the callback then casts back to the + * expected type. This unfortunately subverts the type checking the + * compiler would perform if it were a direct call. Here's an example: + * + * static void my_callback(void *_obj) + * { + * struct obj *obj = _obj; + * ... + * } + * ... + * register_callback(my_callback, &my_obj); + * + * If we wanted to use the natural type for my_callback (ie. "void + * my_callback(struct obj *obj)"), we could make register_callback() + * take a void * as its first argument, but this would subvert all + * type checking. We really want register_callback() to accept only + * the exactly correct function type to match the argument, or a + * function which takes a void *. + * + * This is where typesafe_cb() comes in: it uses typesafe_cb_cast() to + * cast the callback function if it matches the argument type: + * + * void _register_callback(void (*cb)(void *arg), void *arg); + * #define register_callback(cb, arg) \ + * _register_callback(typesafe_cb(void, void *, (cb), (arg)), \ + * (arg)) + * + * On compilers which don't support the extensions required + * typesafe_cb_cast() and friend become an unconditional cast, so your + * code will compile but you won't get type checking. + * + * Example: + * #include <ccan/typesafe_cb/typesafe_cb.h> + * #include <stdlib.h> + * #include <stdio.h> + * + * // Generic callback infrastructure. + * struct callback { + * struct callback *next; + * int value; + * int (*callback)(int value, void *arg); + * void *arg; + * }; + * static struct callback *callbacks; + * + * static void _register_callback(int value, int (*cb)(int, void *), + * void *arg) + * { + * struct callback *new = malloc(sizeof(*new)); + * new->next = callbacks; + * new->value = value; + * new->callback = cb; + * new->arg = arg; + * callbacks = new; + * } + * #define register_callback(value, cb, arg) \ + * _register_callback(value, \ + * typesafe_cb_preargs(int, void *, \ + * (cb), (arg), int),\ + * (arg)) + * + * static struct callback *find_callback(int value) + * { + * struct callback *i; + * + * for (i = callbacks; i; i = i->next) + * if (i->value == value) + * return i; + * return NULL; + * } + * + * // Define several silly callbacks. Note they don't use void *! + * #define DEF_CALLBACK(name, op) \ + * static int name(int val, int *arg) \ + * { \ + * printf("%s", #op); \ + * return val op *arg; \ + * } + * DEF_CALLBACK(multiply, *); + * DEF_CALLBACK(add, +); + * DEF_CALLBACK(divide, /); + * DEF_CALLBACK(sub, -); + * DEF_CALLBACK(or, |); + * DEF_CALLBACK(and, &); + * DEF_CALLBACK(xor, ^); + * DEF_CALLBACK(assign, =); + * + * // Silly game to find the longest chain of values. + * int main(int argc, char *argv[]) + * { + * int i, run = 1, num = argv[1] ? atoi(argv[1]) : 0; + * + * for (i = 1; i < 1024;) { + * // Since run is an int, compiler checks "add" does too. + * register_callback(i++, add, &run); + * register_callback(i++, divide, &run); + * register_callback(i++, sub, &run); + * register_callback(i++, multiply, &run); + * register_callback(i++, or, &run); + * register_callback(i++, and, &run); + * register_callback(i++, xor, &run); + * register_callback(i++, assign, &run); + * } + * + * printf("%i ", num); + * while (run < 56) { + * struct callback *cb = find_callback(num % i); + * if (!cb) { + * printf("-> STOP\n"); + * return 1; + * } + * num = cb->callback(num, cb->arg); + * printf("->%i ", num); + * run++; + * } + * printf("-> Winner!\n"); + * return 0; + * } + * + * License: LGPL (2 or any later version) + * Author: Rusty Russell <rusty@rustcorp.com.au> + */ +int main(int argc, char *argv[]) +{ + if (argc != 2) + return 1; + + if (strcmp(argv[1], "depends") == 0) { + return 0; + } + + return 1; +} diff --git a/lib/ccan/typesafe_cb/test/compile_fail-cast_if_any.c b/lib/ccan/typesafe_cb/test/compile_fail-cast_if_any.c new file mode 100644 index 0000000000..dfb51167ff --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_fail-cast_if_any.c @@ -0,0 +1,42 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +struct foo { + int x; +}; + +struct bar { + int x; +}; + +struct baz { + int x; +}; + +struct any { + int x; +}; + +struct other { + int x; +}; + +static void take_any(struct any *any) +{ +} + +int main(int argc, char *argv[]) +{ +#ifdef FAIL + struct other +#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P +#error "Unfortunately we don't fail if cast_if_type is a noop." +#endif +#else + struct foo +#endif + *arg = NULL; + take_any(cast_if_any(struct any *, arg, arg, + struct foo *, struct bar *, struct baz *)); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_fail-cast_if_type-promotable.c b/lib/ccan/typesafe_cb/test/compile_fail-cast_if_type-promotable.c new file mode 100644 index 0000000000..11d42f4c6b --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_fail-cast_if_type-promotable.c @@ -0,0 +1,23 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdbool.h> + +static void _set_some_value(void *val) +{ +} + +#define set_some_value(expr) \ + _set_some_value(typesafe_cb_cast(void *, long, (expr))) + +int main(int argc, char *argv[]) +{ +#ifdef FAIL + bool x = 0; +#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P +#error "Unfortunately we don't fail if typesafe_cb_cast is a noop." +#endif +#else + long x = 0; +#endif + set_some_value(x); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_fail-cast_if_type.c b/lib/ccan/typesafe_cb/test/compile_fail-cast_if_type.c new file mode 100644 index 0000000000..610793514f --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_fail-cast_if_type.c @@ -0,0 +1,25 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> + +void _set_some_value(void *val); + +void _set_some_value(void *val) +{ +} + +#define set_some_value(expr) \ + _set_some_value(cast_if_type(void *, (expr), (expr), unsigned long)) + +int main(int argc, char *argv[]) +{ +#ifdef FAIL + int x = 0; + set_some_value(x); +#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P +#error "Unfortunately we don't fail if cast_if_type is a noop." +#endif +#else + void *p = 0; + set_some_value(p); +#endif + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb-int.c b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb-int.c new file mode 100644 index 0000000000..c4033364d4 --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb-int.c @@ -0,0 +1,27 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +void _callback(void (*fn)(void *arg), void *arg); +void _callback(void (*fn)(void *arg), void *arg) +{ + fn(arg); +} + +/* Callback is set up to warn if arg isn't a pointer (since it won't + * pass cleanly to _callback's second arg. */ +#define callback(fn, arg) \ + _callback(typesafe_cb(void, (fn), (arg)), (arg)) + +void my_callback(int something); +void my_callback(int something) +{ +} + +int main(int argc, char *argv[]) +{ +#ifdef FAIL + /* This fails due to arg, not due to cast. */ + callback(my_callback, 100); +#endif + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb.c b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb.c new file mode 100644 index 0000000000..81e36d7b87 --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb.c @@ -0,0 +1,34 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +static void _register_callback(void (*cb)(void *arg), void *arg) +{ +} + +#define register_callback(cb, arg) \ + _register_callback(typesafe_cb(void, void *, (cb), (arg)), (arg)) + +static void my_callback(char *p) +{ +} + +int main(int argc, char *argv[]) +{ + char str[] = "hello world"; +#ifdef FAIL + int *p; +#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P +#error "Unfortunately we don't fail if typesafe_cb_cast is a noop." +#endif +#else + char *p; +#endif + p = NULL; + + /* This should work always. */ + register_callback(my_callback, str); + + /* This will fail with FAIL defined */ + register_callback(my_callback, p); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_cast-multi.c b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_cast-multi.c new file mode 100644 index 0000000000..62b5f91e18 --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_cast-multi.c @@ -0,0 +1,43 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +struct foo { + int x; +}; + +struct bar { + int x; +}; + +struct baz { + int x; +}; + +struct any { + int x; +}; + +struct other { + int x; +}; + +static void take_any(struct any *any) +{ +} + +int main(int argc, char *argv[]) +{ +#ifdef FAIL + struct other +#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P +#error "Unfortunately we don't fail if typesafe_cb_cast is a noop." +#endif +#else + struct foo +#endif + *arg = NULL; + take_any(typesafe_cb_cast3(struct any *, + struct foo *, struct bar *, struct baz *, + arg)); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_cast.c b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_cast.c new file mode 100644 index 0000000000..d2e6f2ab40 --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_cast.c @@ -0,0 +1,25 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> + +void _set_some_value(void *val); + +void _set_some_value(void *val) +{ +} + +#define set_some_value(expr) \ + _set_some_value(typesafe_cb_cast(void *, unsigned long, (expr))) + +int main(int argc, char *argv[]) +{ +#ifdef FAIL + int x = 0; + set_some_value(x); +#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P +#error "Unfortunately we don't fail if typesafe_cb_cast is a noop." +#endif +#else + void *p = 0; + set_some_value(p); +#endif + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_exact.c b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_exact.c new file mode 100644 index 0000000000..0f61d5decd --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_exact.c @@ -0,0 +1,33 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +static void _register_callback(void (*cb)(void *arg), const void *arg) +{ +} + +#define register_callback(cb, arg) \ + _register_callback(typesafe_cb_exact(void, (cb), (arg)), (arg)) + +static void my_callback(const char *p) +{ +} + +int main(int argc, char *argv[]) +{ +#ifdef FAIL + char *p; +#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P +#error "Unfortunately we don't fail if cast_if_type is a noop." +#endif +#else + const char *p; +#endif + p = NULL; + + /* This should work always. */ + register_callback(my_callback, (const char *)"hello world"); + + /* This will fail with FAIL defined */ + register_callback(my_callback, p); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_postargs.c b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_postargs.c new file mode 100644 index 0000000000..7d3530851d --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_postargs.c @@ -0,0 +1,27 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +static void _register_callback(void (*cb)(void *arg, int x), void *arg) +{ +} +#define register_callback(cb, arg) \ + _register_callback(typesafe_cb_postargs(void, void *, (cb), (arg), int), (arg)) + +static void my_callback(char *p, int x) +{ +} + +int main(int argc, char *argv[]) +{ +#ifdef FAIL + int *p; +#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P +#error "Unfortunately we don't fail if typesafe_cb_cast is a noop." +#endif +#else + char *p; +#endif + p = NULL; + register_callback(my_callback, p); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_preargs.c b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_preargs.c new file mode 100644 index 0000000000..bd55c6722c --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_fail-typesafe_cb_preargs.c @@ -0,0 +1,28 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +static void _register_callback(void (*cb)(int x, void *arg), void *arg) +{ +} + +#define register_callback(cb, arg) \ + _register_callback(typesafe_cb_preargs(void, void *, (cb), (arg), int), (arg)) + +static void my_callback(int x, char *p) +{ +} + +int main(int argc, char *argv[]) +{ +#ifdef FAIL + int *p; +#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P +#error "Unfortunately we don't fail if typesafe_cb_cast is a noop." +#endif +#else + char *p; +#endif + p = NULL; + register_callback(my_callback, p); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_ok-cast_if_any.c b/lib/ccan/typesafe_cb/test/compile_ok-cast_if_any.c new file mode 100644 index 0000000000..e8f3c49406 --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_ok-cast_if_any.c @@ -0,0 +1,41 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +struct foo { + int x; +}; + +struct bar { + int x; +}; + +struct baz { + int x; +}; + +struct any { + int x; +}; + +static void take_any(struct any *any) +{ +} + +int main(int argc, char *argv[]) +{ +#if HAVE_TYPEOF + /* Otherwise we get unused warnings for these. */ + struct foo *foo = NULL; + struct bar *bar = NULL; + struct baz *baz = NULL; +#endif + struct other *arg = NULL; + + take_any(cast_if_any(struct any *, arg, foo, + struct foo *, struct bar *, struct baz *)); + take_any(cast_if_any(struct any *, arg, bar, + struct foo *, struct bar *, struct baz *)); + take_any(cast_if_any(struct any *, arg, baz, + struct foo *, struct bar *, struct baz *)); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-NULL.c b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-NULL.c new file mode 100644 index 0000000000..265de8b14e --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-NULL.c @@ -0,0 +1,17 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +/* NULL args for callback function should be OK for normal and _def. */ + +static void _register_callback(void (*cb)(const void *arg), const void *arg) +{ +} + +#define register_callback(cb, arg) \ + _register_callback(typesafe_cb(void, const void *, (cb), (arg)), (arg)) + +int main(int argc, char *argv[]) +{ + register_callback(NULL, "hello world"); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-const.c b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-const.c new file mode 100644 index 0000000000..7c2d62ef23 --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-const.c @@ -0,0 +1,50 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +/* const args in callbacks should be OK. */ + +static void _register_callback(void (*cb)(void *arg), void *arg) +{ +} + +#define register_callback(cb, arg) \ + _register_callback(typesafe_cb(void, (cb), (arg)), (arg)) + +#define register_callback_def(cb, arg) \ + _register_callback(typesafe_cb_def(void, (cb), (arg)), (arg)) + +static void _register_callback_pre(void (*cb)(int x, void *arg), void *arg) +{ +} + +#define register_callback_pre(cb, arg) \ + _register_callback_pre(typesafe_cb_preargs(void, (cb), (arg), int), (arg)) + +static void _register_callback_post(void (*cb)(void *arg, int x), void *arg) +{ +} + +#define register_callback_post(cb, arg) \ + _register_callback_post(typesafe_cb_postargs(void, (cb), (arg), int), (arg)) + +static void my_callback(const char *p) +{ +} + +static void my_callback_pre(int x, /*const*/ char *p) +{ +} + +static void my_callback_post(/*const*/ char *p, int x) +{ +} + +int main(int argc, char *argv[]) +{ + char p[] = "hello world"; + register_callback(my_callback, p); + register_callback_def(my_callback, p); + register_callback_pre(my_callback_pre, p); + register_callback_post(my_callback_post, p); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-undefined.c b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-undefined.c new file mode 100644 index 0000000000..aa50bad6a9 --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-undefined.c @@ -0,0 +1,49 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +/* const args in callbacks should be OK. */ + +static void _register_callback(void (*cb)(void *arg), void *arg) +{ +} + +#define register_callback(cb, arg) \ + _register_callback(typesafe_cb(void, void *, (cb), (arg)), (arg)) + +static void _register_callback_pre(void (*cb)(int x, void *arg), void *arg) +{ +} + +#define register_callback_pre(cb, arg) \ + _register_callback_pre(typesafe_cb_preargs(void, void *, (cb), (arg), int), (arg)) + +static void _register_callback_post(void (*cb)(void *arg, int x), void *arg) +{ +} + +#define register_callback_post(cb, arg) \ + _register_callback_post(typesafe_cb_postargs(void, void *, (cb), (arg), int), (arg)) + +struct undefined; + +static void my_callback(struct undefined *undef) +{ +} + +static void my_callback_pre(int x, struct undefined *undef) +{ +} + +static void my_callback_post(struct undefined *undef, int x) +{ +} + +int main(int argc, char *argv[]) +{ + struct undefined *handle = NULL; + + register_callback(my_callback, handle); + register_callback_pre(my_callback_pre, handle); + register_callback_post(my_callback_post, handle); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-vars.c b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-vars.c new file mode 100644 index 0000000000..f6a2bfecbc --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-vars.c @@ -0,0 +1,52 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +/* const args in callbacks should be OK. */ + +static void _register_callback(void (*cb)(void *arg), void *arg) +{ +} + +#define register_callback(cb, arg) \ + _register_callback(typesafe_cb(void, void *, (cb), (arg)), (arg)) + +static void _register_callback_pre(void (*cb)(int x, void *arg), void *arg) +{ +} + +#define register_callback_pre(cb, arg) \ + _register_callback_pre(typesafe_cb_preargs(void, void *, (cb), (arg), int), (arg)) + +static void _register_callback_post(void (*cb)(void *arg, int x), void *arg) +{ +} + +#define register_callback_post(cb, arg) \ + _register_callback_post(typesafe_cb_postargs(void, void *, (cb), (arg), int), (arg)) + +struct undefined; + +static void my_callback(struct undefined *undef) +{ +} + +static void my_callback_pre(int x, struct undefined *undef) +{ +} + +static void my_callback_post(struct undefined *undef, int x) +{ +} + +int main(int argc, char *argv[]) +{ + struct undefined *handle = NULL; + void (*cb)(struct undefined *undef) = my_callback; + void (*pre)(int x, struct undefined *undef) = my_callback_pre; + void (*post)(struct undefined *undef, int x) = my_callback_post; + + register_callback(cb, handle); + register_callback_pre(pre, handle); + register_callback_post(post, handle); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-volatile.c b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-volatile.c new file mode 100644 index 0000000000..3fcb1ff656 --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-volatile.c @@ -0,0 +1,47 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +/* volatile args in callbacks should be OK. */ + +static void _register_callback(void (*cb)(void *arg), void *arg) +{ +} + +#define register_callback(cb, arg) \ + _register_callback(typesafe_cb(void, (cb), (arg)), (arg)) + +static void _register_callback_pre(void (*cb)(int x, void *arg), void *arg) +{ +} + +#define register_callback_pre(cb, arg) \ + _register_callback_pre(typesafe_cb_preargs(void, (cb), (arg), int), (arg)) + +static void _register_callback_post(void (*cb)(void *arg, int x), void *arg) +{ +} + +#define register_callback_post(cb, arg) \ + _register_callback_post(typesafe_cb_postargs(void, (cb), (arg), int), (arg)) + +static void my_callback(volatile char *p) +{ +} + +/* FIXME: Can't handle volatile for these */ +static void my_callback_pre(int x, /* volatile */ char *p) +{ +} + +static void my_callback_post(/* volatile */ char *p, int x) +{ +} + +int main(int argc, char *argv[]) +{ + char p[] = "hello world"; + register_callback(my_callback, p); + register_callback_pre(my_callback_pre, p); + register_callback_post(my_callback_post, p); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb_cast.c b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb_cast.c new file mode 100644 index 0000000000..b7f21dc094 --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb_cast.c @@ -0,0 +1,41 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +struct foo { + int x; +}; + +struct bar { + int x; +}; + +struct baz { + int x; +}; + +struct any { + int x; +}; + +static void take_any(struct any *any) +{ +} + +int main(int argc, char *argv[]) +{ + /* Otherwise we get unused warnings for these. */ + struct foo *foo = NULL; + struct bar *bar = NULL; + struct baz *baz = NULL; + + take_any(typesafe_cb_cast3(struct any *, + struct foo *, struct bar *, struct baz *, + foo)); + take_any(typesafe_cb_cast3(struct any *, + struct foo *, struct bar *, struct baz *, + bar)); + take_any(typesafe_cb_cast3(struct any *, + struct foo *, struct bar *, struct baz *, + baz)); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb_def-const.c b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb_def-const.c new file mode 100644 index 0000000000..01e090f1dc --- /dev/null +++ b/lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb_def-const.c @@ -0,0 +1,46 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <stdlib.h> + +/* const args in callbacks should be OK. */ + +static void _register_callback(void (*cb)(void *arg), void *arg) +{ +} + +#define register_callback(cb, arg) \ + _register_callback(typesafe_cb(void, (cb), (arg)), (arg)) + +static void _register_callback_pre(void (*cb)(int x, void *arg), void *arg) +{ +} + +#define register_callback_pre(cb, arg) \ + _register_callback_pre(typesafe_cb_preargs(void, (cb), (arg), int), (arg)) + +static void _register_callback_post(void (*cb)(void *arg, int x), void *arg) +{ +} + +#define register_callback_post(cb, arg) \ + _register_callback_post(typesafe_cb_postargs(void, (cb), (arg), int), (arg)) + +static void my_callback(const char *p) +{ +} + +static void my_callback_pre(int x, /*const*/ char *p) +{ +} + +static void my_callback_post(/*const*/ char *p, int x) +{ +} + +int main(int argc, char *argv[]) +{ + char p[] = "hello world"; + register_callback(my_callback, p); + register_callback_pre(my_callback_pre, p); + register_callback_post(my_callback_post, p); + return 0; +} diff --git a/lib/ccan/typesafe_cb/test/run.c b/lib/ccan/typesafe_cb/test/run.c new file mode 100644 index 0000000000..116e7d1946 --- /dev/null +++ b/lib/ccan/typesafe_cb/test/run.c @@ -0,0 +1,109 @@ +#include <ccan/typesafe_cb/typesafe_cb.h> +#include <string.h> +#include <stdint.h> +#include <ccan/tap/tap.h> + +static char dummy = 0; + +/* The example usage. */ +static void _set_some_value(void *val) +{ + ok1(val == &dummy); +} + +#define set_some_value(expr) \ + _set_some_value(typesafe_cb_cast(void *, unsigned long, (expr))) + +static void _callback_onearg(void (*fn)(void *arg), void *arg) +{ + fn(arg); +} + +static void _callback_preargs(void (*fn)(int a, int b, void *arg), void *arg) +{ + fn(1, 2, arg); +} + +static void _callback_postargs(void (*fn)(void *arg, int a, int b), void *arg) +{ + fn(arg, 1, 2); +} + +#define callback_onearg(cb, arg) \ + _callback_onearg(typesafe_cb(void, void *, (cb), (arg)), (arg)) + +#define callback_preargs(cb, arg) \ + _callback_preargs(typesafe_cb_preargs(void, void *, (cb), (arg), int, int), (arg)) + +#define callback_postargs(cb, arg) \ + _callback_postargs(typesafe_cb_postargs(void, void *, (cb), (arg), int, int), (arg)) + +static void my_callback_onearg(char *p) +{ + ok1(strcmp(p, "hello world") == 0); +} + +static void my_callback_preargs(int a, int b, char *p) +{ + ok1(a == 1); + ok1(b == 2); + ok1(strcmp(p, "hello world") == 0); +} + +static void my_callback_postargs(char *p, int a, int b) +{ + ok1(a == 1); + ok1(b == 2); + ok1(strcmp(p, "hello world") == 0); +} + +/* This is simply a compile test; we promised typesafe_cb_cast can be in a + * static initializer. */ +struct callback_onearg +{ + void (*fn)(void *arg); + const void *arg; +}; + +struct callback_onearg cb_onearg += { typesafe_cb(void, void *, my_callback_onearg, (char *)(intptr_t)"hello world"), + "hello world" }; + +struct callback_preargs +{ + void (*fn)(int a, int b, void *arg); + const void *arg; +}; + +struct callback_preargs cb_preargs += { typesafe_cb_preargs(void, void *, my_callback_preargs, + (char *)(intptr_t)"hi", int, int), "hi" }; + +struct callback_postargs +{ + void (*fn)(void *arg, int a, int b); + const void *arg; +}; + +struct callback_postargs cb_postargs += { typesafe_cb_postargs(void, void *, my_callback_postargs, + (char *)(intptr_t)"hi", int, int), "hi" }; + +int main(int argc, char *argv[]) +{ + void *p = &dummy; + unsigned long l = (unsigned long)p; + char str[] = "hello world"; + + plan_tests(2 + 1 + 3 + 3); + set_some_value(p); + set_some_value(l); + + callback_onearg(my_callback_onearg, str); + + callback_preargs(my_callback_preargs, str); + + callback_postargs(my_callback_postargs, str); + + return exit_status(); +} diff --git a/lib/ccan/typesafe_cb/typesafe_cb.h b/lib/ccan/typesafe_cb/typesafe_cb.h new file mode 100644 index 0000000000..40cfa39798 --- /dev/null +++ b/lib/ccan/typesafe_cb/typesafe_cb.h @@ -0,0 +1,133 @@ +#ifndef CCAN_TYPESAFE_CB_H +#define CCAN_TYPESAFE_CB_H +#include "config.h" + +#if HAVE_TYPEOF && HAVE_BUILTIN_CHOOSE_EXPR && HAVE_BUILTIN_TYPES_COMPATIBLE_P +/** + * typesafe_cb_cast - only cast an expression if it matches a given type + * @desttype: the type to cast to + * @oktype: the type we allow + * @expr: the expression to cast + * + * This macro is used to create functions which allow multiple types. + * The result of this macro is used somewhere that a @desttype type is + * expected: if @expr is exactly of type @oktype, then it will be + * cast to @desttype type, otherwise left alone. + * + * This macro can be used in static initializers. + * + * This is merely useful for warnings: if the compiler does not + * support the primitives required for typesafe_cb_cast(), it becomes an + * unconditional cast, and the @oktype argument is not used. In + * particular, this means that @oktype can be a type which uses the + * "typeof": it will not be evaluated if typeof is not supported. + * + * Example: + * // We can take either an unsigned long or a void *. + * void _set_some_value(void *val); + * #define set_some_value(e) \ + * _set_some_value(typesafe_cb_cast(void *, (e), unsigned long)) + */ +#define typesafe_cb_cast(desttype, oktype, expr) \ + __builtin_choose_expr( \ + __builtin_types_compatible_p(__typeof__(0?(expr):(expr)), \ + oktype), \ + (desttype)(expr), (expr)) +#else +#define typesafe_cb_cast(desttype, oktype, expr) ((desttype)(expr)) +#endif + +/** + * typesafe_cb_cast3 - only cast an expression if it matches given types + * @desttype: the type to cast to + * @ok1: the first type we allow + * @ok2: the second type we allow + * @ok3: the third type we allow + * @expr: the expression to cast + * + * This is a convenient wrapper for multiple typesafe_cb_cast() calls. + * You can chain them inside each other (ie. use typesafe_cb_cast() + * for expr) if you need more than 3 arguments. + * + * Example: + * // We can take either a long, unsigned long, void * or a const void *. + * void _set_some_value(void *val); + * #define set_some_value(expr) \ + * _set_some_value(typesafe_cb_cast3(void *,, \ + * long, unsigned long, const void *,\ + * (expr))) + */ +#define typesafe_cb_cast3(desttype, ok1, ok2, ok3, expr) \ + typesafe_cb_cast(desttype, ok1, \ + typesafe_cb_cast(desttype, ok2, \ + typesafe_cb_cast(desttype, ok3, \ + (expr)))) + +/** + * typesafe_cb - cast a callback function if it matches the arg + * @rtype: the return type of the callback function + * @atype: the (pointer) type which the callback function expects. + * @fn: the callback function to cast + * @arg: the (pointer) argument to hand to the callback function. + * + * If a callback function takes a single argument, this macro does + * appropriate casts to a function which takes a single atype argument if the + * callback provided matches the @arg. + * + * It is assumed that @arg is of pointer type: usually @arg is passed + * or assigned to a void * elsewhere anyway. + * + * Example: + * void _register_callback(void (*fn)(void *arg), void *arg); + * #define register_callback(fn, arg) \ + * _register_callback(typesafe_cb(void, (fn), void*, (arg)), (arg)) + */ +#define typesafe_cb(rtype, atype, fn, arg) \ + typesafe_cb_cast(rtype (*)(atype), \ + rtype (*)(__typeof__(arg)), \ + (fn)) + +/** + * typesafe_cb_preargs - cast a callback function if it matches the arg + * @rtype: the return type of the callback function + * @atype: the (pointer) type which the callback function expects. + * @fn: the callback function to cast + * @arg: the (pointer) argument to hand to the callback function. + * + * This is a version of typesafe_cb() for callbacks that take other arguments + * before the @arg. + * + * Example: + * void _register_callback(void (*fn)(int, void *arg), void *arg); + * #define register_callback(fn, arg) \ + * _register_callback(typesafe_cb_preargs(void, (fn), void *, \ + * (arg), int), \ + * (arg)) + */ +#define typesafe_cb_preargs(rtype, atype, fn, arg, ...) \ + typesafe_cb_cast(rtype (*)(__VA_ARGS__, atype), \ + rtype (*)(__VA_ARGS__, __typeof__(arg)), \ + (fn)) + +/** + * typesafe_cb_postargs - cast a callback function if it matches the arg + * @rtype: the return type of the callback function + * @atype: the (pointer) type which the callback function expects. + * @fn: the callback function to cast + * @arg: the (pointer) argument to hand to the callback function. + * + * This is a version of typesafe_cb() for callbacks that take other arguments + * after the @arg. + * + * Example: + * void _register_callback(void (*fn)(void *arg, int), void *arg); + * #define register_callback(fn, arg) \ + * _register_callback(typesafe_cb_postargs(void, (fn), void *, \ + * (arg), int), \ + * (arg)) + */ +#define typesafe_cb_postargs(rtype, atype, fn, arg, ...) \ + typesafe_cb_cast(rtype (*)(atype, __VA_ARGS__), \ + rtype (*)(__typeof__(arg), __VA_ARGS__), \ + (fn)) +#endif /* CCAN_CAST_IF_TYPE_H */ |