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qemu
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compiler: support Darwin weak references 

Weakrefs only tell you if the symbol was defined elsewhere, so you
need a further check at runtime to pick the default definition
when needed.

This could be automated by the compiler, but it does not do it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2012-11-02 15:43:20 +01:00 committed by Anthony Liguori
parent 2a0dfd004d
commit 1f001dc7bc
5 changed files with 71 additions and 48 deletions
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9
compiler.h
View File

@ -50,8 +50,15 @@
# define __printf__ __gnu_printf__
# endif
# endif
# define QEMU_WEAK_ALIAS(newname, oldname) \
# if defined(__APPLE__)
# define QEMU_WEAK_ALIAS(newname, oldname) \
static typeof(oldname) weak_##newname __attribute__((unused, weakref(#oldname)))
# define QEMU_WEAK_REF(newname, oldname) (weak_##newname ? weak_##newname : oldname)
# else
# define QEMU_WEAK_ALIAS(newname, oldname) \
typeof(oldname) newname __attribute__((weak, alias (#oldname)))
# define QEMU_WEAK_REF(newname, oldname) newname
# endif
#else
#define GCC_ATTR /**/
#define GCC_FMT_ATTR(n, m)

56
osdep.c
View File

@ -54,6 +54,38 @@ static bool fips_enabled = false;
static const char *qemu_version = QEMU_VERSION;
static int default_fdset_get_fd(int64_t fdset_id, int flags)
{
return -1;
}
QEMU_WEAK_ALIAS(monitor_fdset_get_fd, default_fdset_get_fd);
#define monitor_fdset_get_fd \
QEMU_WEAK_REF(monitor_fdset_get_fd, default_fdset_get_fd)
static int default_fdset_dup_fd_add(int64_t fdset_id, int dup_fd)
{
return -1;
}
QEMU_WEAK_ALIAS(monitor_fdset_dup_fd_add, default_fdset_dup_fd_add);
#define monitor_fdset_dup_fd_add \
QEMU_WEAK_REF(monitor_fdset_dup_fd_add, default_fdset_dup_fd_add)
static int default_fdset_dup_fd_remove(int dup_fd)
{
return -1;
}
QEMU_WEAK_ALIAS(monitor_fdset_dup_fd_remove, default_fdset_dup_fd_remove);
#define monitor_fdset_dup_fd_remove \
QEMU_WEAK_REF(monitor_fdset_dup_fd_remove, default_fdset_dup_fd_remove)
static int default_fdset_dup_fd_find(int dup_fd)
{
return -1;
}
QEMU_WEAK_ALIAS(monitor_fdset_dup_fd_find, default_fdset_dup_fd_find);
#define monitor_fdset_dup_fd_find \
QEMU_WEAK_REF(monitor_fdset_dup_fd_remove, default_fdset_dup_fd_find)
int socket_set_cork(int fd, int v)
{
#if defined(SOL_TCP) && defined(TCP_CORK)
@ -400,27 +432,3 @@ bool fips_get_state(void)
return fips_enabled;
}
static int default_fdset_get_fd(int64_t fdset_id, int flags)
{
return -1;
}
QEMU_WEAK_ALIAS(monitor_fdset_get_fd, default_fdset_get_fd);
static int default_fdset_dup_fd_add(int64_t fdset_id, int dup_fd)
{
return -1;
}
QEMU_WEAK_ALIAS(monitor_fdset_dup_fd_add, default_fdset_dup_fd_add);
static int default_fdset_dup_fd_remove(int dup_fd)
{
return -1;
}
QEMU_WEAK_ALIAS(monitor_fdset_dup_fd_remove, default_fdset_dup_fd_remove);
static int default_fdset_dup_fd_find(int dup_fd)
{
return -1;
}
QEMU_WEAK_ALIAS(monitor_fdset_dup_fd_find, default_fdset_dup_fd_find);

12
oslib-win32.c
View File

@ -32,6 +32,13 @@
#include "trace.h"
#include "qemu_socket.h"
static void default_qemu_fd_register(int fd)
{
}
QEMU_WEAK_ALIAS(qemu_fd_register, default_qemu_fd_register);
#define qemu_fd_register \
QEMU_WEAK_REF(qemu_fd_register, default_qemu_fd_register)
void *qemu_oom_check(void *ptr)
{
if (ptr == NULL) {
@ -150,8 +157,3 @@ int qemu_get_thread_id(void)
{
return GetCurrentThreadId();
}
static void default_qemu_fd_register(int fd)
{
}
QEMU_WEAK_ALIAS(qemu_fd_register, default_qemu_fd_register);

40
qemu-sockets.c
View File

@ -61,6 +61,28 @@ static QemuOptsList dummy_opts = {
},
};
static int default_monitor_get_fd(Monitor *mon, const char *name, Error **errp)
{
error_setg(errp, "only QEMU supports file descriptor passing");
return -1;
}
QEMU_WEAK_ALIAS(monitor_get_fd, default_monitor_get_fd);
#define monitor_get_fd \
QEMU_WEAK_REF(monitor_get_fd, default_monitor_get_fd)
static int default_qemu_set_fd_handler2(int fd,
IOCanReadHandler *fd_read_poll,
IOHandler *fd_read,
IOHandler *fd_write,
void *opaque)
{
abort();
}
QEMU_WEAK_ALIAS(qemu_set_fd_handler2, default_qemu_set_fd_handler2);
#define qemu_set_fd_handler2 \
QEMU_WEAK_REF(qemu_set_fd_handler2, default_qemu_set_fd_handler2)
static int inet_getport(struct addrinfo *e)
{
struct sockaddr_in *i4;
@ -967,21 +989,3 @@ int socket_init(void)
#endif
return 0;
}
static int default_monitor_get_fd(Monitor *mon, const char *name, Error **errp)
{
error_setg(errp, "only QEMU supports file descriptor passing");
return -1;
}
QEMU_WEAK_ALIAS(monitor_get_fd, default_monitor_get_fd);
static int default_qemu_set_fd_handler2(int fd,
IOCanReadHandler *fd_read_poll,
IOHandler *fd_read,
IOHandler *fd_write,
void *opaque)
{
abort();
}
QEMU_WEAK_ALIAS(qemu_set_fd_handler2, default_qemu_set_fd_handler2);

2
qmp.c
View File

@ -477,6 +477,8 @@ static CpuDefinitionInfoList *default_arch_query_cpu_definitions(Error **errp)
return NULL;
}
QEMU_WEAK_ALIAS(arch_query_cpu_definitions, default_arch_query_cpu_definitions);
#define arch_query_cpu_definitions \
QEMU_WEAK_REF(arch_query_cpu_definitions, default_arch_query_cpu_definitions)
CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
{