2004-07-07 13:29:23 +02:00
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--- gcc/cpplib.h.orig Mon Feb 9 13:23:51 2004
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+++ gcc/cpplib.h Thu Apr 29 12:24:10 2004
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@@ -630,6 +630,7 @@
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#define CPP_N_DECIMAL 0x0100
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#define CPP_N_HEX 0x0200
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#define CPP_N_OCTAL 0x0400
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+#define CPP_N_BINARY 0x0800
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#define CPP_N_UNSIGNED 0x1000 /* Properties. */
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#define CPP_N_IMAGINARY 0x2000
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--- gcc/cppexp.c.orig Thu Feb 12 00:52:56 2004
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+++ gcc/cppexp.c Thu Apr 29 12:29:40 2004
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@@ -22,6 +22,9 @@
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#include "system.h"
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#include "cpplib.h"
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#include "cpphash.h"
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+#include "flags.h"
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+#include "coretypes.h"
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+#include "toplev.h"
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#define PART_PRECISION (sizeof (cpp_num_part) * CHAR_BIT)
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#define HALF_MASK (~(cpp_num_part) 0 >> (PART_PRECISION / 2))
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@@ -75,6 +78,9 @@
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#define SYNTAX_ERROR2(msgid, arg) \
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do { cpp_error (pfile, CPP_DL_ERROR, msgid, arg); goto syntax_error; } \
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while(0)
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+#define SYNTAX_ERROR3(msgid, arg1, arg2) \
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+ do { cpp_error (pfile, CPP_DL_ERROR, msgid, arg1, arg2); goto syntax_error; } \
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+ while(0)
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/* Subroutine of cpp_classify_number. S points to a float suffix of
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length LEN, possibly zero. Returns 0 for an invalid suffix, or a
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@@ -171,6 +177,11 @@
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radix = 16;
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str++;
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}
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+ else if ((*str == 'b' || *str == 'B') && (str[1] == '0' || str[1] == '1'))
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+ {
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+ radix = 2;
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+ str++;
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+ }
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}
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/* Now scan for a well-formed integer or float. */
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@@ -209,7 +220,8 @@
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radix = 10;
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if (max_digit >= radix)
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- SYNTAX_ERROR2 ("invalid digit \"%c\" in octal constant", '0' + max_digit);
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+ SYNTAX_ERROR3 ("invalid digit \"%c\" in %s constant", '0' + max_digit,
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+ radix == 2? "binary": "octal");
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if (float_flag != NOT_FLOAT)
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{
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@@ -288,11 +300,16 @@
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if ((result & CPP_N_IMAGINARY) && CPP_PEDANTIC (pfile))
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cpp_error (pfile, CPP_DL_PEDWARN,
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"imaginary constants are a GCC extension");
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+ if (radix == 2 && CPP_PEDANTIC (pfile))
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+ cpp_error (pfile, CPP_DL_PEDWARN,
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+ "binary constants are a GCC extension");
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if (radix == 10)
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result |= CPP_N_DECIMAL;
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else if (radix == 16)
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result |= CPP_N_HEX;
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+ else if (radix == 2)
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+ result |= CPP_N_BINARY;
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else
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result |= CPP_N_OCTAL;
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@@ -341,6 +358,11 @@
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else if ((type & CPP_N_RADIX) == CPP_N_HEX)
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{
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base = 16;
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+ p += 2;
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+ }
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+ else if ((type & CPP_N_RADIX) == CPP_N_BINARY)
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+ {
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+ base = 2;
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p += 2;
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}
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2004-07-07 21:49:07 +02:00
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--- gcc/doc/extend.texi.orig Wed Jun 9 20:31:59 2004
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+++ gcc/doc/extend.texi Wed Jul 7 20:51:58 2004
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@@ -475,6 +475,7 @@
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* Pragmas:: Pragmas accepted by GCC.
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* Unnamed Fields:: Unnamed struct/union fields within structs/unions.
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* Thread-Local:: Per-thread variables.
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+* Binary constants:: Binary constants using the `0b' prefix.
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@end menu
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@node Statement Exprs
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@@ -7648,6 +7649,26 @@
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Non-@code{static} members shall not be @code{__thread}.
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@end quotation
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@end itemize
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+
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+@node Binary constants
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+@section Binary constants using the `0b' prefix
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+@cindex Binary constants using the `0b' prefix
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+
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+@emph{Note:} This is currently a private extension of AVR-GCC.
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+
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+Integer constants can be written as binary constants, consisting of a
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+sequence of `0' and `1' digits, prefixed by `0b'. This is
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+particularly useful in environments that operate a lot on the
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+bit-level (like microcontrollers).
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+
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+The following statements are identical:
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+
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+@smallexample
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+i = 42;
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+i = 0x2a;
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+i = 052;
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+i = 0b101010;
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+@end smallexample
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@node C++ Extensions
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@chapter Extensions to the C++ Language
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