[patch] Support binary (0b...) numbers

[patch] Support binary (0b...) numbers

[Jan Kratochvil]

Hi,

it is completely offtopic from my other work but I got now surprised GDB
cannot parse standard C syntax of binary (0b11 == 3) numbers.

No regressions on {x86_64,x86_64-m32,i686}-fedora12-linux-gnu.


Thanks,
Jan


gdb/
2010-01-11  Jan Kratochvil  <jan.kratochvil@redhat.com>

	Implement binary numbers parsing.
	* c-exp.y (parse_number): New case 'b' and 'B'.

gdb/testsuite/
2010-01-11  Jan Kratochvil  <jan.kratochvil@redhat.com>

	Implement binary numbers parsing.
	* gdb.base/printcmds.exp (test_integer_literals_accepted)
	(test_integer_literals_rejected): New binary tests.

--- a/gdb/c-exp.y
+++ b/gdb/c-exp.y
@@ -1411,6 +1411,16 @@ parse_number (char *p, int len, int parsed_float, YYSTYPE *putithere)
 	  }
 	break;
 
+      case 'b':
+      case 'B':
+	if (len >= 3)
+	  {
+	    p += 2;
+	    base = 2;
+	    len -= 2;
+	  }
+	break;
+
       case 't':
       case 'T':
       case 'd':
--- a/gdb/testsuite/gdb.base/printcmds.exp
+++ b/gdb/testsuite/gdb.base/printcmds.exp
@@ -78,6 +78,13 @@ proc test_integer_literals_accepted {} {
     gdb_test "p 0xabcdef" " = 11259375"
     gdb_test "p 0xAbCdEf" " = 11259375"
     gdb_test "p/x 0x123" " = 0x123"
+
+    # Test various binary values.
+
+    gdb_test "p 0b0" " = 0"
+    gdb_test "p 0b1111" " = 15"
+    gdb_test "p 0B1111" " = 15"
+    gdb_test "p -0b1111" " = -15"
 }
 
 proc test_character_literals_accepted {} {
@@ -99,7 +106,8 @@ proc test_character_literals_accepted {} {
 proc test_integer_literals_rejected {} {
     global gdb_prompt
 
-    test_print_reject "p 0x" 
+    test_print_reject "p 0x"
+    test_print_reject "p 0b"
     gdb_test "p ''" "(Empty character constant\\.|A character constant must contain at least one character\\.)"
     gdb_test "p '''" "(Empty character constant\\.|A character constant must contain at least one character\\.)"
     test_print_reject "p '\\'"
@@ -131,6 +139,11 @@ proc test_integer_literals_rejected {} {
 
     test_print_reject "p 0xG" 
     test_print_reject "p 0xAG" 
+
+    # Test various binary values.
+
+    test_print_reject "p 0b2" 
+    test_print_reject "p 0b12" 
 }
 
 proc test_print_all_chars {} {

Re: [patch] Support binary (0b...) numbers

[Tristan Gingold]

On Jan 11, 2010, at 3:37 PM, Jan Kratochvil wrote:

> Hi,
> 
> it is completely offtopic from my other work but I got now surprised GDB
> cannot parse standard C syntax of binary (0b11 == 3) numbers.

'standard' ?  I thought this was a GNU-C extension.

Anyways, that's a good idea.

Tristan.

Re: [patch] Support binary (0b...) numbers

[Tom Tromey]

>>>>> "Jan" == Jan Kratochvil <jan.kratochvil@redhat.com> writes:

Jan> 2010-01-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
Jan> 	Implement binary numbers parsing.
Jan> 	* c-exp.y (parse_number): New case 'b' and 'B'.
Jan> 2010-01-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
Jan> 	Implement binary numbers parsing.
Jan> 	* gdb.base/printcmds.exp (test_integer_literals_accepted)
Jan> 	(test_integer_literals_rejected): New binary tests.

Ok.  Thanks.

Tom

Re: [patch] Support binary (0b...) numbers

[Joel Brobecker]

> 2010-01-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
> 
> 	Implement binary numbers parsing.
> 	* c-exp.y (parse_number): New case 'b' and 'B'.

Is this worth a NEWS entry?

-- 
Joel

Re: [patch] Support binary (0b...) numbers

[Jan Kratochvil]

On Mon, 11 Jan 2010 18:51:04 +0100, Tom Tromey wrote:
> >>>>> "Jan" == Jan Kratochvil <jan.kratochvil@redhat.com> writes:
> 
> Jan> 2010-01-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
> Jan> 	Implement binary numbers parsing.
> Jan> 	* c-exp.y (parse_number): New case 'b' and 'B'.
> Jan> 2010-01-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
> Jan> 	Implement binary numbers parsing.
> Jan> 	* gdb.base/printcmds.exp (test_integer_literals_accepted)
> Jan> 	(test_integer_literals_rejected): New binary tests.
> 
> Ok.  Thanks.

Checked-in:
	http://sourceware.org/ml/gdb-cvs/2010-01/msg00094.html


Thanks,
Jan

Re: [patch] Support binary (0b...) numbers

[Jan Kratochvil]

On Mon, 11 Jan 2010 16:04:02 +0100, Tristan Gingold wrote:
> On Jan 11, 2010, at 3:37 PM, Jan Kratochvil wrote:
> > it is completely offtopic from my other work but I got now surprised GDB
> > cannot parse standard C syntax of binary (0b11 == 3) numbers.
> 
> 'standard' ?  I thought this was a GNU-C extension.

Ah, really:
	info '(gcc)Binary constants'

is under node 'C Extensions'.  I did not know.


Thanks,
Jan

Re: [patch] Support binary (0b...) numbers

[Jan Kratochvil]

On Mon, 11 Jan 2010 18:57:22 +0100, Joel Brobecker wrote:
> > 2010-01-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
> > 
> > 	Implement binary numbers parsing.
> > 	* c-exp.y (parse_number): New case 'b' and 'B'.
> 
> Is this worth a NEWS entry?

That makes sense.  OK to check-in?


Thanks,
Jan


2010-01-11  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* NEWS: Document 0b binary number prefix parsing.

--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -128,6 +128,11 @@ teval EXPR, ...
 ftrace FN / FILE:LINE / *ADDR
   Define a fast tracepoint at the given function, line, or address.
 
+* New expression syntax
+
+  GDB now parses the 0b prefix of binary numbers the same was as GCC does.
+  GDB now parses 0b101010 identically with 42.
+
 * New options
 
 set follow-exec-mode new|same

Re: [patch] Support binary (0b...) numbers

[Michael Snyder]

Jan Kratochvil wrote:
> Hi,
> 
> it is completely offtopic from my other work but I got now surprised GDB
> cannot parse standard C syntax of binary (0b11 == 3) numbers.

Thanks for this!   ;-)

Re: [patch] Support binary (0b...) numbers

[Eli Zaretskii]

> Date: Mon, 11 Jan 2010 19:11:22 +0100
> From: Jan Kratochvil <jan.kratochvil@redhat.com>
> Cc: gdb-patches@sourceware.org
> 
> That makes sense.  OK to check-in?
> 
> 
> Thanks,
> Jan
> 
> 
> 2010-01-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
> 
> 	* NEWS: Document 0b binary number prefix parsing.

Yes, thanks.

Re: [patch] Support binary (0b...) numbers

[Jan Kratochvil]

On Mon, 11 Jan 2010 20:26:04 +0100, Eli Zaretskii wrote:
> > 	* NEWS: Document 0b binary number prefix parsing.
> 
> Yes, thanks.

Fixed "was"->"way", checked-in.


Thanks,
Jan


http://sourceware.org/ml/gdb-cvs/2010-01/msg00096.html

--- src/gdb/ChangeLog	2010/01/11 18:15:05	1.11233
+++ src/gdb/ChangeLog	2010/01/11 19:29:12	1.11234
@@ -1,5 +1,9 @@
 2010-01-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
+	* NEWS: Document the 0b binary number prefix parsing.
+
+2010-01-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
 	* objfiles.c (objfile_relocate1): Change the return type to int.
 	Describe the new return value.  Return non-zero if data changed.
 	(objfile_relocate): New variable changed.  Set it.  Call
--- src/gdb/NEWS	2010/01/10 06:43:01	1.347
+++ src/gdb/NEWS	2010/01/11 19:29:12	1.348
@@ -128,6 +128,11 @@
 ftrace FN / FILE:LINE / *ADDR
   Define a fast tracepoint at the given function, line, or address.
 
+* New expression syntax
+
+  GDB now parses the 0b prefix of binary numbers the same way as GCC does.
+  GDB now parses 0b101010 identically with 42.
+
 * New options
 
 set follow-exec-mode new|same

Re: [patch] Support binary (0b...) numbers

[Mark Kettenis]

> Date: Mon, 11 Jan 2010 15:37:49 +0100
> From: Jan Kratochvil <jan.kratochvil@redhat.com>
> 
> Hi,
> 
> it is completely offtopic from my other work but I got now surprised GDB
> cannot parse standard C syntax of binary (0b11 == 3) numbers.

Uh, standard C?  My copy of C99 doesn't seem to mention these.

Re: [patch] Support binary (0b...) numbers

[Stan Shebs]

Jan Kratochvil wrote:
> Hi,
>
> it is completely offtopic from my other work but I got now surprised GDB
> cannot parse standard C syntax of binary (0b11 == 3) numbers.
>   
... and kudos for posting this on a totally appropriate day! :-)

Stan