diff options
Diffstat (limited to '30-gcc-4.1.2-binary-constants.patch')
| -rw-r--r-- | 30-gcc-4.1.2-binary-constants.patch | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/30-gcc-4.1.2-binary-constants.patch b/30-gcc-4.1.2-binary-constants.patch new file mode 100644 index 000000000000..3f21cb6fdbaf --- /dev/null +++ b/30-gcc-4.1.2-binary-constants.patch @@ -0,0 +1,144 @@ +--- ./gcc/doc/extend.texi.orig Sat Aug 6 15:26:27 2005 ++++ ./gcc/doc/extend.texi Mon Aug 22 00:14:05 2005 +@@ -79,6 +79,7 @@ + * Pragmas:: Pragmas accepted by GCC. + * Unnamed Fields:: Unnamed struct/union fields within structs/unions. + * Thread-Local:: Per-thread variables. ++* Binary constants:: Binary constants using the @samp{0b} prefix. + @end menu + + @node Statement Exprs +@@ -9742,6 +9743,28 @@ + Non-@code{static} members shall not be @code{__thread}. + @end quotation + @end itemize ++ ++@node Binary constants ++@section Binary constants using the @samp{0b} prefix ++@cindex Binary constants using the @samp{0b} prefix ++ ++Integer constants can be written as binary constants, consisting of a ++sequence of @samp{0} and @samp{1} digits, prefixed by @samp{0b} or ++@samp{0B}. This is particularly useful in environments that operate a ++lot on the bit-level (like microcontrollers). ++ ++The following statements are identical: ++ ++@smallexample ++i = 42; ++i = 0x2a; ++i = 052; ++i = 0b101010; ++@end smallexample ++ ++The type of these constants follows the same rules as for octal or ++hexadecimal integer constants, so suffixes like @samp{L} or @samp{UL} ++can be applied. + + @node C++ Extensions + @chapter Extensions to the C++ Language +--- ./libcpp/include/cpplib.h.orig Wed Jun 29 04:34:39 2005 ++++ ./libcpp/include/cpplib.h Mon Aug 22 00:14:05 2005 +@@ -729,6 +729,7 @@ + #define CPP_N_DECIMAL 0x0100 + #define CPP_N_HEX 0x0200 + #define CPP_N_OCTAL 0x0400 ++#define CPP_N_BINARY 0x0800 + + #define CPP_N_UNSIGNED 0x1000 /* Properties. */ + #define CPP_N_IMAGINARY 0x2000 +--- ./libcpp/expr.c.orig Wed Jun 29 04:34:36 2005 ++++ ./libcpp/expr.c Mon Aug 22 12:02:28 2005 +@@ -171,6 +171,11 @@ + radix = 16; + str++; + } ++ else if ((*str == 'b' || *str == 'B') && (str[1] == '0' || str[1] == '1')) ++ { ++ radix = 2; ++ str++; ++ } + } + + /* Now scan for a well-formed integer or float. */ +@@ -209,10 +214,22 @@ + radix = 10; + + if (max_digit >= radix) +- SYNTAX_ERROR2 ("invalid digit \"%c\" in octal constant", '0' + max_digit); ++ { ++ if (radix == 2) ++ SYNTAX_ERROR2 ("invalid digit \"%c\" in binary constant", '0' + max_digit); ++ else ++ SYNTAX_ERROR2 ("invalid digit \"%c\" in octal constant", '0' + max_digit); ++ } + + if (float_flag != NOT_FLOAT) + { ++ if (radix == 2) ++ { ++ cpp_error (pfile, CPP_DL_ERROR, ++ "invalid prefix \"0b\" for floating constant"); ++ return CPP_N_INVALID; ++ } ++ + if (radix == 16 && CPP_PEDANTIC (pfile) && !CPP_OPTION (pfile, c99)) + cpp_error (pfile, CPP_DL_PEDWARN, + "use of C99 hexadecimal floating constant"); +@@ -288,11 +305,16 @@ + if ((result & CPP_N_IMAGINARY) && CPP_PEDANTIC (pfile)) + cpp_error (pfile, CPP_DL_PEDWARN, + "imaginary constants are a GCC extension"); ++ if (radix == 2 && CPP_PEDANTIC (pfile)) ++ cpp_error (pfile, CPP_DL_PEDWARN, ++ "binary constants are a GCC extension"); + + if (radix == 10) + result |= CPP_N_DECIMAL; + else if (radix == 16) + result |= CPP_N_HEX; ++ else if (radix == 2) ++ result |= CPP_N_BINARY; + else + result |= CPP_N_OCTAL; + +@@ -343,6 +365,11 @@ + base = 16; + p += 2; + } ++ else if ((type & CPP_N_RADIX) == CPP_N_BINARY) ++ { ++ base = 2; ++ p += 2; ++ } + + /* We can add a digit to numbers strictly less than this without + needing the precision and slowness of double integers. */ +@@ -398,12 +425,25 @@ + append_digit (cpp_num num, int digit, int base, size_t precision) + { + cpp_num result; +- unsigned int shift = 3 + (base == 16); ++ unsigned int shift; + bool overflow; + cpp_num_part add_high, add_low; + +- /* Multiply by 8 or 16. Catching this overflow here means we don't ++ /* Multiply by 2, 8 or 16. Catching this overflow here means we don't + need to worry about add_high overflowing. */ ++ switch (base) ++ { ++ case 2: ++ shift = 1; ++ break; ++ ++ case 16: ++ shift = 4; ++ break; ++ ++ default: ++ shift = 3; ++ } + overflow = !!(num.high >> (PART_PRECISION - shift)); + result.high = num.high << shift; + result.low = num.low << shift; |