[cfe-commits] r112481 - in /cfe/trunk: lib/Lex/Lexer.cpp test/Lexer/ms-extensions.c
Chris Lattner
clattner at apple.com
Mon Aug 30 10:12:49 PDT 2010
On Aug 30, 2010, at 7:50 AM, Douglas Gregor wrote:
> Author: dgregor
> Date: Mon Aug 30 09:50:47 2010
> New Revision: 112481
>
> URL: http://llvm.org/viewvc/llvm-project?rev=112481&view=rev
> Log:
> In Microsoft compatibility mode, don't parse the exponent as part of
> the pp-number in a hexadecimal floating point literal, from Francois
> Pichet! Fixes PR7968.
You may or may not care, but this patch isn't correct. It will not correctly lex things like:
0\
x1234e+1
Please change this to use getCharAndSize.
-Chris
>
> Modified:
> cfe/trunk/lib/Lex/Lexer.cpp
> cfe/trunk/test/Lexer/ms-extensions.c
>
> Modified: cfe/trunk/lib/Lex/Lexer.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Lex/Lexer.cpp?rev=112481&r1=112480&r2=112481&view=diff
> ==============================================================================
> --- cfe/trunk/lib/Lex/Lexer.cpp (original)
> +++ cfe/trunk/lib/Lex/Lexer.cpp Mon Aug 30 09:50:47 2010
> @@ -925,6 +925,11 @@
> }
> }
>
> +/// isHexaLiteral - Return true if Start points to a hex constant.
> +static inline bool isHexaLiteral(const char* Start, const char* End) {
> + return ((End - Start > 2) && Start[0] == '0' &&
> + (Start[1] == 'x' || Start[1] == 'X'));
> +}
>
> /// LexNumericConstant - Lex the remainder of a integer or floating point
> /// constant. From[-1] is the first character lexed. Return the end of the
> @@ -940,7 +945,11 @@
> }
>
> // If we fell out, check for a sign, due to 1e+12. If we have one, continue.
> - if ((C == '-' || C == '+') && (PrevCh == 'E' || PrevCh == 'e'))
> + // If we are in Microsoft mode, don't continue if the constant is hex.
> + // For example, MSVC will accept the following as 3 tokens: 0x1234567e+1
> + if ((C == '-' || C == '+') && (PrevCh == 'E' || PrevCh == 'e') &&
> + (!PP || !PP->getLangOptions().Microsoft ||
> + !isHexaLiteral(BufferPtr, CurPtr)))
> return LexNumericConstant(Result, ConsumeChar(CurPtr, Size, Result));
>
> // If we have a hex FP constant, continue.
>
> Modified: cfe/trunk/test/Lexer/ms-extensions.c
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Lexer/ms-extensions.c?rev=112481&r1=112480&r2=112481&view=diff
> ==============================================================================
> --- cfe/trunk/test/Lexer/ms-extensions.c (original)
> +++ cfe/trunk/test/Lexer/ms-extensions.c Mon Aug 30 09:50:47 2010
> @@ -23,3 +23,11 @@
> unsigned short s = USHORT;
> unsigned char c = UCHAR;
> }
> +
> +void pr_7968()
> +{
> + int var1 = 0x1111111e+1;
> + int var2 = 0X1111111e+1;
> + int var3 = 0xe+1;
> + int var4 = 0XE+1;
> +}
>
>
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