2016-09-23 17:02:51 +02:00
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/* compiler.h: macros to abstract away compiler specifics
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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2011-07-11 19:24:44 +02:00
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#ifndef COMPILER_H
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#define COMPILER_H
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2016-07-15 18:27:40 +02:00
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#if defined __clang_analyzer__ || defined __COVERITY__
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#define QEMU_STATIC_ANALYSIS 1
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#endif
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2011-07-11 19:24:44 +02:00
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#define QEMU_NORETURN __attribute__ ((__noreturn__))
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2011-09-16 22:03:07 +02:00
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2011-07-11 19:24:44 +02:00
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#define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
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qom: Add object_new_with_props() / object_new_withpropv() helpers
It is reasonably common to want to create an object, set a
number of properties, register it in the hierarchy and then
mark it as complete (if a user creatable type). This requires
quite a lot of error prone, verbose, boilerplate code to achieve.
First a pair of functions object_set_props() / object_set_propv()
are added which allow for a list of objects to be set in
one single API call.
Then object_new_with_props() / object_new_with_propv() constructors
are added which simplify the sequence of calls to create an
object, populate properties, register in the object composition
tree and mark the object complete, into a single method call.
Usage would be:
Error *err = NULL;
Object *obj;
obj = object_new_with_propv(TYPE_MEMORY_BACKEND_FILE,
object_get_objects_root(),
"hostmem0",
&err,
"share", "yes",
"mem-path", "/dev/shm/somefile",
"prealloc", "yes",
"size", "1048576",
NULL);
Note all property values are passed in string form and will
be parsed into their required data types, using normal QOM
semantics for parsing from string format.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
2015-05-13 18:14:06 +02:00
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#define QEMU_SENTINEL __attribute__((sentinel))
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2019-05-07 13:55:02 +02:00
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#if defined(_WIN32) && (defined(__x86_64__) || defined(__i386__))
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2011-08-31 12:38:00 +02:00
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# define QEMU_PACKED __attribute__((gcc_struct, packed))
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#else
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# define QEMU_PACKED __attribute__((packed))
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#endif
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2016-06-08 20:55:19 +02:00
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#define QEMU_ALIGNED(X) __attribute__((aligned(X)))
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2015-08-19 17:20:19 +02:00
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#ifndef glue
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#define xglue(x, y) x ## y
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#define glue(x, y) xglue(x, y)
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#define stringify(s) tostring(s)
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#define tostring(s) #s
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#endif
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#ifndef likely
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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#endif
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#ifndef container_of
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#define container_of(ptr, type, member) ({ \
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const typeof(((type *) 0)->member) *__mptr = (ptr); \
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(type *) ((char *) __mptr - offsetof(type, member));})
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#endif
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2018-06-14 18:44:31 +02:00
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#define sizeof_field(type, field) sizeof(((type *)0)->field)
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2019-10-11 17:27:59 +02:00
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/*
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* Calculate the number of bytes up to and including the given 'field' of
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* 'container'.
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*/
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#define endof(container, field) \
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(offsetof(container, field) + sizeof_field(container, field))
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2015-08-19 17:20:19 +02:00
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/* Convert from a base type to a parent type, with compile time checking. */
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#define DO_UPCAST(type, field, dev) ( __extension__ ( { \
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char __attribute__((unused)) offset_must_be_zero[ \
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-offsetof(type, field)]; \
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container_of(dev, type, field);}))
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#define typeof_field(type, field) typeof(((type *)0)->field)
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#define type_check(t1,t2) ((t1*)0 - (t2*)0)
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2017-01-19 21:56:14 +01:00
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#define QEMU_BUILD_BUG_ON_STRUCT(x) \
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struct { \
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int:(x) ? -1 : 1; \
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}
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2018-02-24 16:40:27 +01:00
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/* QEMU_BUILD_BUG_MSG() emits the message given if _Static_assert is
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* supported; otherwise, it will be omitted from the compiler error
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* message (but as it remains present in the source code, it can still
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* be useful when debugging). */
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2017-03-14 17:59:53 +01:00
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#if defined(CONFIG_STATIC_ASSERT)
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2018-02-24 16:40:27 +01:00
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#define QEMU_BUILD_BUG_MSG(x, msg) _Static_assert(!(x), msg)
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2017-03-14 17:59:53 +01:00
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#elif defined(__COUNTER__)
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2018-02-24 16:40:27 +01:00
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#define QEMU_BUILD_BUG_MSG(x, msg) typedef QEMU_BUILD_BUG_ON_STRUCT(x) \
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2017-01-19 21:56:14 +01:00
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glue(qemu_build_bug_on__, __COUNTER__) __attribute__((unused))
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2017-01-31 15:29:51 +01:00
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#else
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2018-02-24 16:40:27 +01:00
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#define QEMU_BUILD_BUG_MSG(x, msg)
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2017-01-31 15:29:51 +01:00
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#endif
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2011-07-11 19:24:44 +02:00
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2018-02-24 16:40:27 +01:00
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#define QEMU_BUILD_BUG_ON(x) QEMU_BUILD_BUG_MSG(x, "not expecting: " #x)
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2017-01-18 21:05:15 +01:00
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#define QEMU_BUILD_BUG_ON_ZERO(x) (sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)) - \
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sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)))
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2020-12-10 14:47:46 +01:00
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#if defined(__clang__)
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/* clang doesn't support gnu_printf, so use printf. */
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# define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))
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2020-12-10 14:47:50 +01:00
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#else
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2020-12-10 14:47:46 +01:00
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/* Use gnu_printf (qemu uses standard format strings). */
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# define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
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# if defined(_WIN32)
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/*
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* Map __printf__ to __gnu_printf__ because we want standard format strings even
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* when MinGW or GLib include files use __printf__.
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*/
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# define __printf__ __gnu_printf__
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2011-07-11 19:24:44 +02:00
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# endif
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#endif
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2018-11-30 09:23:16 +01:00
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#ifndef __has_warning
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#define __has_warning(x) 0 /* compatibility with non-clang compilers */
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#endif
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2018-01-16 16:11:52 +01:00
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#ifndef __has_feature
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#define __has_feature(x) 0 /* compatibility with non-clang compilers */
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#endif
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2018-09-27 17:55:38 +02:00
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#ifndef __has_builtin
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#define __has_builtin(x) 0 /* compatibility with non-clang compilers */
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#endif
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2018-12-03 14:33:12 +01:00
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#if __has_builtin(__builtin_assume_aligned) || !defined(__clang__)
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2018-09-27 17:55:38 +02:00
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#define HAS_ASSUME_ALIGNED
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#endif
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2018-09-26 17:48:50 +02:00
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#ifndef __has_attribute
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#define __has_attribute(x) 0 /* compatibility with older GCC */
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#endif
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/*
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* GCC doesn't provide __has_attribute() until GCC 5, but we know all the GCC
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* versions we support have the "flatten" attribute. Clang may not have the
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* "flatten" attribute but always has __has_attribute() to check for it.
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*/
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#if __has_attribute(flatten) || !defined(__clang__)
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# define QEMU_FLATTEN __attribute__((flatten))
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#else
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# define QEMU_FLATTEN
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#endif
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2018-08-16 01:31:47 +02:00
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/*
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* If __attribute__((error)) is present, use it to produce an error at
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* compile time. Otherwise, one must wait for the linker to diagnose
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* the missing symbol.
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*/
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#if __has_attribute(error)
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# define QEMU_ERROR(X) __attribute__((error(X)))
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#else
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# define QEMU_ERROR(X)
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#endif
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2019-01-03 09:56:34 +01:00
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/*
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* The nonstring variable attribute specifies that an object or member
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* declaration with type array of char or pointer to char is intended
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* to store character arrays that do not necessarily contain a terminating
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* NUL character. This is useful in detecting uses of such arrays or pointers
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* with functions that expect NUL-terminated strings, and to avoid warnings
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* when such an array or pointer is used as an argument to a bounded string
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* manipulation function such as strncpy.
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*/
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#if __has_attribute(nonstring)
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# define QEMU_NONSTRING __attribute__((nonstring))
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#else
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# define QEMU_NONSTRING
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#endif
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2019-09-10 18:02:36 +02:00
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/*
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* Forced inlining may be desired to encourage constant propagation
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* of function parameters. However, it can also make debugging harder,
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* so disable it for a non-optimizing build.
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*/
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#if defined(__OPTIMIZE__)
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#define QEMU_ALWAYS_INLINE __attribute__((always_inline))
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#else
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#define QEMU_ALWAYS_INLINE
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#endif
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2018-09-27 17:55:38 +02:00
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2018-02-03 16:39:32 +01:00
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/* Implement C11 _Generic via GCC builtins. Example:
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*
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* QEMU_GENERIC(x, (float, sinf), (long double, sinl), sin) (x)
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*
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* The first argument is the discriminator. The last is the default value.
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* The middle ones are tuples in "(type, expansion)" format.
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*/
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/* First, find out the number of generic cases. */
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#define QEMU_GENERIC(x, ...) \
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QEMU_GENERIC_(typeof(x), __VA_ARGS__, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
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/* There will be extra arguments, but they are not used. */
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#define QEMU_GENERIC_(x, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, count, ...) \
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QEMU_GENERIC##count(x, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9)
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/* Two more helper macros, this time to extract items from a parenthesized
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* list.
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*/
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#define QEMU_FIRST_(a, b) a
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#define QEMU_SECOND_(a, b) b
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/* ... and a final one for the common part of the "recursion". */
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#define QEMU_GENERIC_IF(x, type_then, else_) \
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__builtin_choose_expr(__builtin_types_compatible_p(x, \
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QEMU_FIRST_ type_then), \
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QEMU_SECOND_ type_then, else_)
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/* CPP poor man's "recursion". */
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#define QEMU_GENERIC1(x, a0, ...) (a0)
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#define QEMU_GENERIC2(x, a0, ...) QEMU_GENERIC_IF(x, a0, QEMU_GENERIC1(x, __VA_ARGS__))
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#define QEMU_GENERIC3(x, a0, ...) QEMU_GENERIC_IF(x, a0, QEMU_GENERIC2(x, __VA_ARGS__))
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#define QEMU_GENERIC4(x, a0, ...) QEMU_GENERIC_IF(x, a0, QEMU_GENERIC3(x, __VA_ARGS__))
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#define QEMU_GENERIC5(x, a0, ...) QEMU_GENERIC_IF(x, a0, QEMU_GENERIC4(x, __VA_ARGS__))
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#define QEMU_GENERIC6(x, a0, ...) QEMU_GENERIC_IF(x, a0, QEMU_GENERIC5(x, __VA_ARGS__))
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#define QEMU_GENERIC7(x, a0, ...) QEMU_GENERIC_IF(x, a0, QEMU_GENERIC6(x, __VA_ARGS__))
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#define QEMU_GENERIC8(x, a0, ...) QEMU_GENERIC_IF(x, a0, QEMU_GENERIC7(x, __VA_ARGS__))
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#define QEMU_GENERIC9(x, a0, ...) QEMU_GENERIC_IF(x, a0, QEMU_GENERIC8(x, __VA_ARGS__))
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#define QEMU_GENERIC10(x, a0, ...) QEMU_GENERIC_IF(x, a0, QEMU_GENERIC9(x, __VA_ARGS__))
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2018-01-16 16:11:52 +01:00
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2019-09-23 20:24:12 +02:00
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/**
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* qemu_build_not_reached()
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*
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* The compiler, during optimization, is expected to prove that a call
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* to this function cannot be reached and remove it. If the compiler
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* supports QEMU_ERROR, this will be reported at compile time; otherwise
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* this will be reported at link time due to the missing symbol.
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*/
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2020-02-05 15:15:45 +01:00
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#if defined(__OPTIMIZE__) && !defined(__NO_INLINE__)
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2019-09-23 20:24:12 +02:00
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extern void QEMU_NORETURN QEMU_ERROR("code path is reachable")
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qemu_build_not_reached(void);
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#else
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#define qemu_build_not_reached() g_assert_not_reached()
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#endif
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2011-07-11 19:24:44 +02:00
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#endif /* COMPILER_H */
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