[PATCH] disassemble support start,+length format

[crquan@gmail.com]

From: CHENG Renquan <rqcheng@smu.edu.sg>

add new support for disassemble by "start,+length" format;

and updated ChangeLog,NEWS,doc/gdb.texinfo, accordingly.

BTW, I found two disassemble Changes in GDB 7.0 in NEWS, separated in two
paragraphs, so I merged them into one paragraph.

Signed-off-by: CHENG Renquan <rqcheng@smu.edu.sg>
Reviewed-by: Eli Zaretskii <eliz@gnu.org>
Reviewed-by: Tom Tromey <tromey@redhat.com>

 gdb/ChangeLog       |    5 +++++
 gdb/NEWS            |   13 ++++++++-----
 gdb/cli/cli-cmds.c  |   16 +++++++++++++---
 gdb/doc/gdb.texinfo |   16 +++++++++++++---
 4 files changed, 39 insertions(+), 11 deletions(-)

Index: gdb/ChangeLog
===================================================================
RCS file: /cvs/src/src/gdb/ChangeLog,v
retrieving revision 1.11603
diff -u -p -r1.11603 ChangeLog
--- gdb/ChangeLog	9 Apr 2010 20:46:39 -0000	1.11603
+++ gdb/ChangeLog	10 Apr 2010 19:23:58 -0000
@@ -1,3 +1,8 @@
+2010-04-09  CHENG Renquan <rqcheng@smu.edu.sg>
+
+	* gdb/cli/cli-cmds.c (disassemble_command): disassemble add support
+	"start,+length" format
+
 2010-04-09  Stan Shebs  <stan@codesourcery.com>
 
 	* tracepoint.c (trace_status_mi): Report frames created.
Index: gdb/NEWS
===================================================================
RCS file: /cvs/src/src/gdb/NEWS,v
retrieving revision 1.369
diff -u -p -r1.369 NEWS
--- gdb/NEWS	9 Apr 2010 15:26:54 -0000	1.369
+++ gdb/NEWS	10 Apr 2010 19:24:01 -0000
@@ -44,6 +44,11 @@ regular breakpoints.
 
 ARM Symbian			arm*-*-symbianelf*
 
+* Changed commands
+
+disassemble
+  The disassemble command now supports "start,+length" form of two arguments.
+
 *** Changes in GDB 7.1
 
 * C++ Improvements
@@ -339,8 +344,9 @@ or the "condition" command is available.
 the target for evaluation using the same bytecode format as is used
 for tracepoint actions.
 
-* "disassemble" command with a /r modifier, print the raw instructions
-in hex as well as in symbolic form.
+* The disassemble command now supports: an optional /r modifier, print the raw
+instructions in hex as well as in symbolic form; and an optional /m modifier
+to print mixed source+assembly.
 
 * Process record and replay
 
@@ -432,9 +438,6 @@ qXfer:siginfo:write
   packet that permited the stub to pass a process id was removed.
   Remote servers should use the `T' stop reply packet instead.
 
-* The "disassemble" command now supports an optional /m modifier to print mixed
-source+assembly.
-
 * GDB now supports multiple function calling conventions according to the
 DWARF-2 DW_AT_calling_convention function attribute.
   
Index: gdb/cli/cli-cmds.c
===================================================================
RCS file: /cvs/src/src/gdb/cli/cli-cmds.c,v
retrieving revision 1.100
diff -u -p -r1.100 cli-cmds.c
--- gdb/cli/cli-cmds.c	9 Apr 2010 03:00:58 -0000	1.100
+++ gdb/cli/cli-cmds.c	10 Apr 2010 19:24:02 -0000
@@ -1047,8 +1047,9 @@ disassemble_current_function (int flags)
        - dump the assembly code for the function of the current pc
      disassemble [/mr] addr
        - dump the assembly code for the function at ADDR
-     disassemble [/mr] low high
-       - dump the assembly code in the range [LOW,HIGH)
+     disassemble [/mr] low,high
+     disassemble [/mr] low,+length
+       - dump the assembly code in the range [LOW,HIGH), or [LOW,LOW+length)
 
    A /m modifier will include source code with the assembly.
    A /r modifier will include raw instructions in hex with the assembly.  */
@@ -1119,8 +1120,16 @@ disassemble_command (char *arg, int from
   else
     {
       /* Two arguments.  */
+      int incl_flag = 0;
       low = pc;
+      if (arg[0] == '+')
+      {
+	++arg;
+	incl_flag = 1;
+      }
       high = parse_and_eval_address (arg);
+      if (incl_flag)
+	high += low;
     }
 
   print_disassembly (gdbarch, name, low, high, flags);
@@ -1548,7 +1557,8 @@ Default is the function surrounding the 
 With a /m modifier, source lines are included (if available).\n\
 With a /r modifier, raw instructions in hex are included.\n\
 With a single argument, the function surrounding that address is dumped.\n\
-Two arguments (separated by a comma) are taken as a range of memory to dump."));
+Two arguments (separated by a comma) are taken as a range of memory to dump,\n\
+  in the form of \"start,end\", or \"start,+length\"."));
   set_cmd_completer (c, location_completer);
   if (xdb_commands)
     add_com_alias ("va", "disassemble", class_xdb, 0);
Index: gdb/doc/gdb.texinfo
===================================================================
RCS file: /cvs/src/src/gdb/doc/gdb.texinfo,v
retrieving revision 1.703
diff -u -p -r1.703 gdb.texinfo
--- gdb/doc/gdb.texinfo	9 Apr 2010 20:46:40 -0000	1.703
+++ gdb/doc/gdb.texinfo	10 Apr 2010 19:24:25 -0000
@@ -6549,9 +6549,19 @@ program counter of the selected frame.  
 command is a program counter value; @value{GDBN} dumps the function
 surrounding this value.  When two arguments are given, they should
 be separated by a comma, possibly surrounded by whitespace.  The
-arguments specify a range of addresses (first inclusive, second exclusive)
-to dump.  In that case, the name of the function is also printed (since
-there could be several functions in the given range).
+arguments specify a range of addresses to dump, in one of two forms:
+
+@table @code
+@item @var{start},@var{end}
+the addresses from @var{start} (inclusive) to @var{end} (exclusive)
+@item @var{start},+@var{length}
+the addresses from @var{start} (inclusive) to
+@code{@var{start}+@var{length}} (exclusive).
+@end table
+
+@noindent
+When 2 arguments are specified, the name of the function is also
+printed (since there could be several functions in the given range).
 
 The argument(s) can be any expression yielding a numeric value, such as
 @samp{0x32c4}, @samp{&main+10} or @samp{$pc - 8}.

--
git v1.7.0.4, rqcheng at smu edu sg