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2004-02-26 Andrew Cagney <cagney@redhat.com>

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* gdbint.texinfo (Coding): Document use of gdbarch_obstack_zalloc
	in Per-architecture module data section.
This commit is contained in:
Andrew Cagney 2004-02-26 20:52:08 +00:00
parent 98f9cd2d31
commit e7f1601561
2 changed files with 32 additions and 31 deletions
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5
gdb/doc/ChangeLog
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@ -1,3 +1,8 @@
2004-02-26 Andrew Cagney <cagney@redhat.com>
* gdbint.texinfo (Coding): Document use of gdbarch_obstack_zalloc
in Per-architecture module data section.
2004-02-25 Roland McGrath <roland@redhat.com>
* gdb.texinfo (General Query Packets): Document qPart:... packets.

56
gdb/doc/gdbint.texinfo
View file

@ -4879,7 +4879,7 @@ object.
A module registers one or more per-architecture data-pointers using the
function @code{register_gdbarch_data}:
@deftypefun struct gdbarch_data *register_gdbarch_data (gdbarch_data_init_ftype *@var{init}, gdbarch_data_free_ftype *@var{free})
@deftypefun struct gdbarch_data *register_gdbarch_data (gdbarch_data_init_ftype *@var{init})
The @var{init} function is used to obtain an initial value for a
per-architecture data-pointer. The function is called, after the
@ -4888,10 +4888,9 @@ uninitialized (@code{NULL}) and its value has been requested via a call
to @code{gdbarch_data}. A data-pointer can also be initialize
explicitly using @code{set_gdbarch_data}.
The @var{free} function is called when a data-pointer needs to be
destroyed. This occurs when either the corresponding @code{struct
gdbarch} object is being destroyed or when @code{set_gdbarch_data} is
overriding a non-@code{NULL} data-pointer value.
Any memory required by the @var{init} function should be allocated
using @code{GDBARCH_OBSTACK_ZALLOC}. That memory is automatically
released when the corresponding architecture is deleted.
The function @code{register_gdbarch_data} returns a @code{struct
gdbarch_data} that is used to identify the data-pointer that was added
@ -4899,23 +4898,18 @@ to the module.
@end deftypefun
A typical module has @code{init} and @code{free} functions of the form:
A typical module has an @code{init} function of the form:
@smallexample
struct nozel @{ int total; @};
static struct gdbarch_data *nozel_handle;
static void *
nozel_init (struct gdbarch *gdbarch)
@{
struct nozel *data = XMALLOC (struct nozel);
struct nozel *data = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct nozel);
@dots{}
return data;
@}
@dots{}
static void
nozel_free (struct gdbarch *gdbarch, void *data)
@{
xfree (data);
@}
@end smallexample
Since uninitialized (@code{NULL}) data-pointers are initialized
@ -4930,7 +4924,7 @@ The data-pointer is registered with the call:
void
_initialize_nozel (void)
@{
nozel_handle = register_gdbarch_data (nozel_init, nozel_free);
nozel_handle = register_gdbarch_data (nozel_init);
@dots{}
@end smallexample
@ -4958,35 +4952,37 @@ nozel_total (struct gdbarch *gdbarch)
It is also possible to directly initialize the data-pointer using:
@deftypefun void set_gdbarch_data (struct gdbarch *@var{gdbarch}, struct gdbarch_data *handle, void *@var{pointer})
Update the data-pointer corresponding to @var{handle} with the value of
@var{pointer}. If the previous data-pointer value is non-NULL, then it
is freed using data-pointers @var{free} function.
@deftypefun void set_gdbarch_data (struct gdbarch *@var{gdbarch}, struct gdbarch_data *@var{handle}, void *@var{pointer})
Set the still @code{NULL} data-pointer corresponding to @var{handle}
to the non-@code{NULL} @var{pointer} value.
@end deftypefun
This function is used by modules that require a mechanism for explicitly
setting the per-architecture data-pointer during architecture creation:
@smallexample
/* Called during architecture creation. */
extern void
set_gdbarch_nozel (struct gdbarch *gdbarch,
int total)
/* Always return a non-NULL nozel. */
static struct nozel *
gdbarch_nozel (struct gdbarch *gdbarch)
@{
struct nozel *data = XMALLOC (struct nozel);
@dots{}
struct nozel *nozel = gdbarch_data (gdbarch, nozel_handle);
if (nozel == NULL)
@{
nozel = nozel_init (gdbarch);
set_gdbarch_data (gdbarch, nozel_handle, nozel);
@}
return nozel;
@}
@end smallexample
@smallexample
/* Default, called when nozel not set by set_gdbarch_nozel(). */
static void *
nozel_init (struct gdbarch *gdbarch)
/* Called during architecture creation. */
extern void
set_gdbarch_nozel (struct gdbarch *gdbarch, int total)
@{
struct nozel *default_nozel = XMALLOC (struc nozel);
struct nozel *data = gdbarch_nozel (gdbarch);
@dots{}
return default_nozel;
data->total = total;
@}
@end smallexample
@ -4994,7 +4990,7 @@ nozel_init (struct gdbarch *gdbarch)
void
_initialize_nozel (void)
@{
nozel_handle = register_gdbarch_data (nozel_init, NULL);
nozel_handle = register_gdbarch_data (nozel_init);
@dots{}
@end smallexample