[Mesa-dev] [Bug 29519] New: [glsl2] Compiler should generate better diagnostics for use of reserved words

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29519

           Summary: [glsl2] Compiler should generate better diagnostics
                    for use of reserved words
           Product: Mesa
           Version: git
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
        AssignedTo: mesa-dev at lists.freedesktop.org
        ReportedBy: idr at freedesktop.org


At each version of GLSL there are a number of words reserved for future use
(see section 3.6 in the GLSL spec).  The lexer processes these and generates
tokens for them.  Upon encountering these tokens, the parse will generate error
messages that are not useful.  For example, using the keyword "half" for a
function name in a GLSL 1.10 shader results in the diagnostic:

error: 0:3(1): error: empty declaration list

A better message would be:

error: 0:3(1): error: invalid use of reserved word `half'

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