/* Output generating routines for GDB.
- Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
+
+ Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2009
+ Free Software Foundation, Inc.
+
Contributed by Cygnus Solutions.
Written by Fernando Nasser for Cygnus.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdb_string.h"
#include "ui-out.h"
#include "gdb_assert.h"
-/* Convenience macro for allocting typesafe memory. */
-
-#undef XMALLOC
-#define XMALLOC(TYPE) (TYPE*) xmalloc (sizeof (TYPE))
-
/* table header structures */
struct ui_out_hdr
int colno;
int width;
int alignment;
+ char *col_name;
char *colhdr;
struct ui_out_hdr *next;
};
is always available. Stack/nested level 0 is reserved for the
top-level result. */
-enum { MAX_UI_OUT_LEVELS = 5 };
+enum { MAX_UI_OUT_LEVELS = 6 };
struct ui_out_level
{
enum ui_out_type type;
};
+/* Tables are special. Maintain a separate structure that tracks
+ their state. At present an output can only contain a single table
+ but that restriction might eventually be lifted. */
+
+struct ui_out_table
+{
+ /* If on, a table is being generated. */
+ int flag;
+
+ /* If on, the body of a table is being generated. If off, the table
+ header is being generated. */
+ int body_flag;
+
+ /* The level at which each entry of the table is to be found. A row
+ (a tuple) is made up of entries. Consequently ENTRY_LEVEL is one
+ above that of the table. */
+ int entry_level;
+
+ /* Number of table columns (as specified in the table_begin call). */
+ int columns;
+
+ /* String identifying the table (as specified in the table_begin
+ call). */
+ char *id;
+
+ /* Points to the first table header (if any). */
+ struct ui_out_hdr *header_first;
+
+ /* Points to the last table header (if any). */
+ struct ui_out_hdr *header_last;
+
+ /* Points to header of NEXT column to format. */
+ struct ui_out_hdr *header_next;
+
+};
+
+
/* The ui_out structure */
/* Any change here requires a corresponding one in the initialization
of the default uiout, which is statically initialized */
struct ui_out_impl *impl;
struct ui_out_data *data;
- /* if on, a table is being generated */
- int table_flag;
-
- /* if on, the body of a table is being generated */
- int body_flag;
-
- /* number of table columns (as specified in the table_begin call) */
- int table_columns;
-
- /* strinf identifying the table (as specified in the table_begin call) */
- char *table_id;
-
- /* Sub structure tracking the table depth. */
+ /* Sub structure tracking the ui-out depth. */
int level;
struct ui_out_level levels[MAX_UI_OUT_LEVELS];
- /* points to the first header (if any) */
- struct ui_out_hdr *headerfirst;
-
- /* points to the last header (if any) */
- struct ui_out_hdr *headerlast;
-
- /* points to header of next column to format */
- struct ui_out_hdr *headercurr;
-
+ /* A table, if any. At present only a single table is supported. */
+ struct ui_out_table table;
};
/* The current (inner most) level. */
/* These are the default implementation functions */
static void default_table_begin (struct ui_out *uiout, int nbrofcols,
- const char *tblid);
+ int nr_rows, const char *tblid);
static void default_table_body (struct ui_out *uiout);
static void default_table_end (struct ui_out *uiout);
static void default_table_header (struct ui_out *uiout, int width,
- enum ui_align alig,
+ enum ui_align alig, const char *col_name,
const char *colhdr);
static void default_begin (struct ui_out *uiout,
enum ui_out_type type,
int width, enum ui_align align,
const char *fldname,
const char *format,
- va_list args);
+ va_list args) ATTR_FORMAT (printf, 6, 0);
static void default_spaces (struct ui_out *uiout, int numspaces);
static void default_text (struct ui_out *uiout, const char *string);
static void default_message (struct ui_out *uiout, int verbosity,
const char *format,
- va_list args);
+ va_list args) ATTR_FORMAT (printf, 3, 0);
static void default_wrap_hint (struct ui_out *uiout, char *identstring);
static void default_flush (struct ui_out *uiout);
default_text,
default_message,
default_wrap_hint,
- default_flush
+ default_flush,
+ NULL,
+ 0, /* Does not need MI hacks. */
};
/* The default ui_out */
/* These are the interfaces to implementation functions */
static void uo_table_begin (struct ui_out *uiout, int nbrofcols,
- const char *tblid);
+ int nr_rows, const char *tblid);
static void uo_table_body (struct ui_out *uiout);
static void uo_table_end (struct ui_out *uiout);
static void uo_table_header (struct ui_out *uiout, int width,
- enum ui_align align, const char *colhdr);
+ enum ui_align align, const char *col_name,
+ const char *colhdr);
static void uo_begin (struct ui_out *uiout,
enum ui_out_type type,
int level, const char *id);
const char *string);
static void uo_field_fmt (struct ui_out *uiout, int fldno, int width,
enum ui_align align, const char *fldname,
- const char *format, va_list args);
+ const char *format, va_list args)
+ ATTR_FORMAT (printf, 6, 0);
static void uo_spaces (struct ui_out *uiout, int numspaces);
static void uo_text (struct ui_out *uiout, const char *string);
static void uo_message (struct ui_out *uiout, int verbosity,
- const char *format, va_list args);
+ const char *format, va_list args)
+ ATTR_FORMAT (printf, 3, 0);
static void uo_wrap_hint (struct ui_out *uiout, char *identstring);
static void uo_flush (struct ui_out *uiout);
+static int uo_redirect (struct ui_out *uiout, struct ui_file *outstream);
/* Prototypes for local functions */
extern void _initialize_ui_out (void);
static void append_header_to_list (struct ui_out *uiout, int width,
- int alignment, const char *colhdr);
-static int get_curr_header (struct ui_out *uiout, int *colno, int *width,
+ int alignment, const char *col_name,
+ const char *colhdr);
+static int get_next_header (struct ui_out *uiout, int *colno, int *width,
int *alignment, char **colhdr);
static void clear_header_list (struct ui_out *uiout);
-static void verify_field_proper_position (struct ui_out *uiout);
-static void verify_field_alignment (struct ui_out *uiout, int fldno, int *width, int *alignment);
-
-static void init_ui_out_state (struct ui_out *uiout);
+static void verify_field (struct ui_out *uiout, int *fldno, int *width,
+ int *align);
/* exported functions (ui_out API) */
/* Mark beginning of a table */
-void
+static void
ui_out_table_begin (struct ui_out *uiout, int nbrofcols,
+ int nr_rows,
const char *tblid)
{
- if (uiout->table_flag)
+ if (uiout->table.flag)
internal_error (__FILE__, __LINE__,
- "tables cannot be nested; table_begin found before \
-previous table_end.");
+ _("tables cannot be nested; table_begin found before \
+previous table_end."));
- uiout->table_flag = 1;
- uiout->table_columns = nbrofcols;
+ uiout->table.flag = 1;
+ uiout->table.body_flag = 0;
+ uiout->table.entry_level = uiout->level + 1;
+ uiout->table.columns = nbrofcols;
if (tblid != NULL)
- uiout->table_id = xstrdup (tblid);
+ uiout->table.id = xstrdup (tblid);
else
- uiout->table_id = NULL;
+ uiout->table.id = NULL;
clear_header_list (uiout);
- uo_table_begin (uiout, nbrofcols, uiout->table_id);
+ uo_table_begin (uiout, nbrofcols, nr_rows, uiout->table.id);
}
void
ui_out_table_body (struct ui_out *uiout)
{
- if (!uiout->table_flag)
+ if (!uiout->table.flag)
internal_error (__FILE__, __LINE__,
- "table_body outside a table is not valid; it must be \
-after a table_begin and before a table_end.");
- if (uiout->body_flag)
+ _("table_body outside a table is not valid; it must be \
+after a table_begin and before a table_end."));
+ if (uiout->table.body_flag)
internal_error (__FILE__, __LINE__,
- "extra table_body call not allowed; there must be \
-only one table_body after a table_begin and before a table_end.");
- if (uiout->headercurr->colno != uiout->table_columns)
+ _("extra table_body call not allowed; there must be \
+only one table_body after a table_begin and before a table_end."));
+ if (uiout->table.header_next->colno != uiout->table.columns)
internal_error (__FILE__, __LINE__,
- "number of headers differ from number of table \
-columns.");
+ _("number of headers differ from number of table \
+columns."));
- uiout->body_flag = 1;
- uiout->headercurr = uiout->headerfirst;
+ uiout->table.body_flag = 1;
+ uiout->table.header_next = uiout->table.header_first;
uo_table_body (uiout);
}
-void
+static void
ui_out_table_end (struct ui_out *uiout)
{
- if (!uiout->table_flag)
+ if (!uiout->table.flag)
internal_error (__FILE__, __LINE__,
- "misplaced table_end or missing table_begin.");
+ _("misplaced table_end or missing table_begin."));
- uiout->body_flag = 0;
- uiout->table_flag = 0;
+ uiout->table.entry_level = 0;
+ uiout->table.body_flag = 0;
+ uiout->table.flag = 0;
uo_table_end (uiout);
- if (uiout->table_id)
- xfree (uiout->table_id);
+ if (uiout->table.id)
+ xfree (uiout->table.id);
clear_header_list (uiout);
}
void
ui_out_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
+ const char *col_name,
const char *colhdr)
{
- if (!uiout->table_flag || uiout->body_flag)
+ if (!uiout->table.flag || uiout->table.body_flag)
internal_error (__FILE__, __LINE__,
- "table header must be specified after table_begin \
-and before table_body.");
+ _("table header must be specified after table_begin \
+and before table_body."));
- append_header_to_list (uiout, width, alignment, colhdr);
+ append_header_to_list (uiout, width, alignment, col_name, colhdr);
- uo_table_header (uiout, width, alignment, colhdr);
+ uo_table_header (uiout, width, alignment, col_name, colhdr);
+}
+
+static void
+do_cleanup_table_end (void *data)
+{
+ struct ui_out *ui_out = data;
+
+ ui_out_table_end (ui_out);
+}
+
+struct cleanup *
+make_cleanup_ui_out_table_begin_end (struct ui_out *ui_out, int nr_cols,
+ int nr_rows, const char *tblid)
+{
+ ui_out_table_begin (ui_out, nr_cols, nr_rows, tblid);
+ return make_cleanup (do_cleanup_table_end, ui_out);
}
void
const char *id)
{
int new_level;
- if (uiout->table_flag && !uiout->body_flag)
+ if (uiout->table.flag && !uiout->table.body_flag)
internal_error (__FILE__, __LINE__,
- "table header or table_body expected; lists must be \
-specified after table_body.");
+ _("table header or table_body expected; lists must be \
+specified after table_body."));
+
+ /* Be careful to verify the ``field'' before the new tuple/list is
+ pushed onto the stack. That way the containing list/table/row is
+ verified and not the newly created tuple/list. This verification
+ is needed (at least) for the case where a table row entry
+ contains either a tuple/list. For that case bookkeeping such as
+ updating the column count or advancing to the next heading still
+ needs to be performed. */
+ {
+ int fldno;
+ int width;
+ int align;
+ verify_field (uiout, &fldno, &width, &align);
+ }
+
new_level = push_level (uiout, type, id);
- if (uiout->table_flag && (new_level == 1))
- uiout->headercurr = uiout->headerfirst;
- uo_begin (uiout, type, new_level, id);
-}
-void
-ui_out_list_begin (struct ui_out *uiout,
- const char *id)
-{
- ui_out_begin (uiout, ui_out_type_list, id);
-}
+ /* If the push puts us at the same level as a table row entry, we've
+ got a new table row. Put the header pointer back to the start. */
+ if (uiout->table.body_flag
+ && uiout->table.entry_level == new_level)
+ uiout->table.header_next = uiout->table.header_first;
-void
-ui_out_tuple_begin (struct ui_out *uiout, const char *id)
-{
- ui_out_begin (uiout, ui_out_type_tuple, id);
+ uo_begin (uiout, type, new_level, id);
}
void
uo_end (uiout, type, old_level);
}
-void
-ui_out_list_end (struct ui_out *uiout)
-{
- ui_out_end (uiout, ui_out_type_list);
-}
-
-void
-ui_out_tuple_end (struct ui_out *uiout)
-{
- ui_out_end (uiout, ui_out_type_tuple);
-}
-
struct ui_out_end_cleanup_data
{
struct ui_out *uiout;
return make_cleanup (do_cleanup_end, end_cleanup_data);
}
-struct cleanup *
-make_cleanup_ui_out_begin_end (struct ui_out *uiout,
- enum ui_out_type type,
- const char *id)
-{
- ui_out_begin (uiout, type, id);
- return make_cleanup_ui_out_end (uiout, type);
-}
-
struct cleanup *
make_cleanup_ui_out_tuple_begin_end (struct ui_out *uiout,
const char *id)
{
- ui_out_tuple_begin (uiout, id);
+ ui_out_begin (uiout, ui_out_type_tuple, id);
return make_cleanup_ui_out_end (uiout, ui_out_type_tuple);
}
make_cleanup_ui_out_list_begin_end (struct ui_out *uiout,
const char *id)
{
- ui_out_list_begin (uiout, id);
+ ui_out_begin (uiout, ui_out_type_list, id);
return make_cleanup_ui_out_end (uiout, ui_out_type_list);
}
int align;
struct ui_out_level *current = current_level (uiout);
- verify_field_proper_position (uiout);
+ verify_field (uiout, &fldno, &width, &align);
- current->field_count += 1;
- fldno = current->field_count;
+ uo_field_int (uiout, fldno, width, align, fldname, value);
+}
+
+void
+ui_out_field_fmt_int (struct ui_out *uiout,
+ int input_width,
+ enum ui_align input_align,
+ const char *fldname,
+ int value)
+{
+ int fldno;
+ int width;
+ int align;
+ struct ui_out_level *current = current_level (uiout);
- verify_field_alignment (uiout, fldno, &width, &align);
+ verify_field (uiout, &fldno, &width, &align);
- uo_field_int (uiout, fldno, width, align, fldname, value);
+ uo_field_int (uiout, fldno, input_width, input_align, fldname, value);
}
void
ui_out_field_core_addr (struct ui_out *uiout,
const char *fldname,
+ struct gdbarch *gdbarch,
CORE_ADDR address)
{
char addstr[20];
+ int addr_bit = gdbarch_addr_bit (gdbarch);
- /* FIXME-32x64: need a print_address_numeric with field width */
- /* print_address_numeric (address, 1, local_stream); */
- strcpy (addstr, local_hex_string_custom ((unsigned long) address, "08l"));
+ if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT))
+ address &= ((CORE_ADDR) 1 << addr_bit) - 1;
+
+ /* FIXME: cagney/2002-05-03: Need local_address_string() function
+ that returns the language localized string formatted to a width
+ based on gdbarch_addr_bit. */
+ if (addr_bit <= 32)
+ strcpy (addstr, hex_string_custom (address, 8));
+ else
+ strcpy (addstr, hex_string_custom (address, 16));
ui_out_field_string (uiout, fldname, addstr);
}
int fldno;
int width;
int align;
- struct ui_out_level *current = current_level (uiout);
-
- verify_field_proper_position (uiout);
- current->field_count += 1;
- fldno = current->field_count;
-
- verify_field_alignment (uiout, fldno, &width, &align);
+ verify_field (uiout, &fldno, &width, &align);
uo_field_skip (uiout, fldno, width, align, fldname);
}
int fldno;
int width;
int align;
- struct ui_out_level *current = current_level (uiout);
- verify_field_proper_position (uiout);
-
- current->field_count += 1;
- fldno = current->field_count;
-
- verify_field_alignment (uiout, fldno, &width, &align);
+ verify_field (uiout, &fldno, &width, &align);
uo_field_string (uiout, fldno, width, align, fldname, string);
}
int fldno;
int width;
int align;
- struct ui_out_level *current = current_level (uiout);
-
- verify_field_proper_position (uiout);
-
- current->field_count += 1;
- fldno = current->field_count;
/* will not align, but has to call anyway */
- verify_field_alignment (uiout, fldno, &width, &align);
+ verify_field (uiout, &fldno, &width, &align);
va_start (args, format);
uo_flush (uiout);
}
+int
+ui_out_redirect (struct ui_out *uiout, struct ui_file *outstream)
+{
+ return uo_redirect (uiout, outstream);
+}
+
/* set the flags specified by the mask given */
int
ui_out_set_flags (struct ui_out *uiout, int mask)
}
#endif
+int
+ui_out_is_mi_like_p (struct ui_out *uiout)
+{
+ return uiout->impl->is_mi_like_p;
+}
+
/* default gdb-out hook functions */
static void
-default_table_begin (struct ui_out *uiout, int nbrofcols, const char *tblid)
+default_table_begin (struct ui_out *uiout, int nbrofcols,
+ int nr_rows,
+ const char *tblid)
{
}
static void
default_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
+ const char *col_name,
const char *colhdr)
{
}
void
uo_table_begin (struct ui_out *uiout, int nbrofcols,
+ int nr_rows,
const char *tblid)
{
if (!uiout->impl->table_begin)
return;
- uiout->impl->table_begin (uiout, nbrofcols, tblid);
+ uiout->impl->table_begin (uiout, nbrofcols, nr_rows, tblid);
}
void
void
uo_table_header (struct ui_out *uiout, int width, enum ui_align align,
+ const char *col_name,
const char *colhdr)
{
if (!uiout->impl->table_header)
return;
- uiout->impl->table_header (uiout, width, align, colhdr);
+ uiout->impl->table_header (uiout, width, align, col_name, colhdr);
}
void
uiout->impl->flush (uiout);
}
+int
+uo_redirect (struct ui_out *uiout, struct ui_file *outstream)
+{
+ if (!uiout->impl->redirect)
+ return -1;
+ uiout->impl->redirect (uiout, outstream);
+ return 0;
+}
+
/* local functions */
/* list of column headers manipulation routines */
static void
clear_header_list (struct ui_out *uiout)
{
- while (uiout->headerfirst != NULL)
+ while (uiout->table.header_first != NULL)
{
- uiout->headercurr = uiout->headerfirst;
- uiout->headerfirst = uiout->headerfirst->next;
- if (uiout->headercurr->colhdr != NULL)
- xfree (uiout->headercurr->colhdr);
- xfree (uiout->headercurr);
+ uiout->table.header_next = uiout->table.header_first;
+ uiout->table.header_first = uiout->table.header_first->next;
+ if (uiout->table.header_next->colhdr != NULL)
+ xfree (uiout->table.header_next->colhdr);
+ xfree (uiout->table.header_next);
}
- uiout->headerlast = NULL;
- uiout->headercurr = NULL;
+ gdb_assert (uiout->table.header_first == NULL);
+ uiout->table.header_last = NULL;
+ uiout->table.header_next = NULL;
}
static void
append_header_to_list (struct ui_out *uiout,
int width,
int alignment,
+ const char *col_name,
const char *colhdr)
{
struct ui_out_hdr *temphdr;
temphdr = XMALLOC (struct ui_out_hdr);
temphdr->width = width;
temphdr->alignment = alignment;
- /* we have to copy the column title as the original may be an automatic */
+ /* We have to copy the column title as the original may be an
+ automatic. */
if (colhdr != NULL)
- {
- temphdr->colhdr = xmalloc (strlen (colhdr) + 1);
- strcpy (temphdr->colhdr, colhdr);
- }
+ temphdr->colhdr = xstrdup (colhdr);
+ else
+ temphdr->colhdr = NULL;
+
+ if (col_name != NULL)
+ temphdr->col_name = xstrdup (col_name);
+ else if (colhdr != NULL)
+ temphdr->col_name = xstrdup (colhdr);
+ else
+ temphdr->col_name = NULL;
+
temphdr->next = NULL;
- if (uiout->headerfirst == NULL)
+ if (uiout->table.header_first == NULL)
{
temphdr->colno = 1;
- uiout->headerfirst = temphdr;
- uiout->headerlast = temphdr;
+ uiout->table.header_first = temphdr;
+ uiout->table.header_last = temphdr;
}
else
{
- temphdr->colno = uiout->headerlast->colno + 1;
- uiout->headerlast->next = temphdr;
- uiout->headerlast = temphdr;
+ temphdr->colno = uiout->table.header_last->colno + 1;
+ uiout->table.header_last->next = temphdr;
+ uiout->table.header_last = temphdr;
}
- uiout->headercurr = uiout->headerlast;
+ uiout->table.header_next = uiout->table.header_last;
}
-/* returns 0 if there is no more headers */
+/* Extract the format information for the NEXT header and and advance
+ the header pointer. Return 0 if there was no next header. */
static int
-get_curr_header (struct ui_out *uiout,
+get_next_header (struct ui_out *uiout,
int *colno,
int *width,
int *alignment,
char **colhdr)
{
- /* There may be no headers at all or we may have used all columns */
- if (uiout->headercurr == NULL)
+ /* There may be no headers at all or we may have used all columns. */
+ if (uiout->table.header_next == NULL)
return 0;
- *colno = uiout->headercurr->colno;
- *width = uiout->headercurr->width;
- *alignment = uiout->headercurr->alignment;
- *colhdr = uiout->headercurr->colhdr;
- uiout->headercurr = uiout->headercurr->next;
+ *colno = uiout->table.header_next->colno;
+ *width = uiout->table.header_next->width;
+ *alignment = uiout->table.header_next->alignment;
+ *colhdr = uiout->table.header_next->colhdr;
+ /* Advance the header pointer to the next entry. */
+ uiout->table.header_next = uiout->table.header_next->next;
return 1;
}
-/* makes sure the field_* calls were properly placed */
+
+/* Verify that the field/tuple/list is correctly positioned. Return
+ the field number and corresponding alignment (if
+ available/applicable). */
static void
-verify_field_proper_position (struct ui_out *uiout)
+verify_field (struct ui_out *uiout, int *fldno, int *width, int *align)
{
- if (uiout->table_flag)
+ struct ui_out_level *current = current_level (uiout);
+ char *text;
+
+ if (uiout->table.flag)
{
- if (!uiout->body_flag)
- internal_error (__FILE__, __LINE__,
- "table_body missing; table fields must be \
-specified after table_body and inside a list.");
- if (uiout->level == 0)
+ if (!uiout->table.body_flag)
internal_error (__FILE__, __LINE__,
- "list_begin missing; table fields must be \
-specified after table_body and inside a list.");
+ _("table_body missing; table fields must be \
+specified after table_body and inside a list."));
+ /* NOTE: cagney/2001-12-08: There was a check here to ensure
+ that this code was only executed when uiout->level was
+ greater than zero. That no longer applies - this code is run
+ before each table row tuple is started and at that point the
+ level is zero. */
}
-}
-
-/* determines what is the alignment policy */
-static void
-verify_field_alignment (struct ui_out *uiout,
- int fldno,
- int *width,
- int *align)
-{
- int colno;
- char *text;
+ current->field_count += 1;
- if (uiout->table_flag
- && get_curr_header (uiout, &colno, width, align, &text))
+ if (uiout->table.body_flag
+ && uiout->table.entry_level == uiout->level
+ && get_next_header (uiout, fldno, width, align, &text))
{
- if (fldno != colno)
+ if (*fldno != current->field_count)
internal_error (__FILE__, __LINE__,
- "ui-out internal error in handling headers.");
+ _("ui-out internal error in handling headers."));
}
else
{
*width = 0;
*align = ui_noalign;
+ *fldno = current->field_count;
}
}
+
/* access to ui_out format private members */
void
uiout->data = data;
uiout->impl = impl;
uiout->flags = flags;
- uiout->table_flag = 0;
- uiout->body_flag = 0;
+ uiout->table.flag = 0;
+ uiout->table.body_flag = 0;
uiout->level = 0;
memset (uiout->levels, 0, sizeof (uiout->levels));
- uiout->headerfirst = NULL;
- uiout->headerlast = NULL;
- uiout->headercurr = NULL;
+ uiout->table.header_first = NULL;
+ uiout->table.header_last = NULL;
+ uiout->table.header_next = NULL;
return uiout;
}
projects / binutils.git / blobdiff