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Carl Worth 22b3aced03 Eliminate some recursion from children of _expand_token_list 
Previously, both _expand_node and _expand_function would always make
mutually recursive calls into _expand_token_list. This was unnecessary
since these functions can simply return unexpanded results, after which
the outer iteration will next attempt expansion of the results.

The only trick in doing this is to arrange so that the active list is
popped at the appropriate time. To do this, we add a new token_node_t
marker to the active stack. When pushing onto the active list, we set
marker to last->next, and when the marker is seen by the token list
iteration, we pop from the active stack.
2010-06-02 15:32:03 -07:00
main Add hash table implementation from glsl2 project. 2010-05-10 13:36:26 -07:00
tests Fix multi-line comment regular expression to handle (non) nested comments. 2010-06-02 10:57:18 -07:00
.gitignore Remove blank lines from output files before comparing. 2010-05-27 14:53:51 -07:00
glcpp-lex.l Factor out common sub-expression from multi-line-comment regular expression. 2010-06-02 12:54:15 -07:00
glcpp-parse.y Eliminate some recursion from children of _expand_token_list 2010-06-02 15:32:03 -07:00
glcpp.c Fix defines involving both literals and other defined macros. 2010-05-12 12:25:34 -07:00
glcpp.h Eliminate some recursion from children of _expand_token_list 2010-06-02 15:32:03 -07:00
hash_table.c Add hash table implementation from glsl2 project. 2010-05-10 13:36:26 -07:00
hash_table.h Add hash table implementation from glsl2 project. 2010-05-10 13:36:26 -07:00
Makefile Implement token pasting of integers. 2010-05-27 14:38:20 -07:00
README Treat newlines as space when invoking a function-like macro invocation. 2010-05-26 16:04:31 -07:00
xtalloc.c Add xtalloc_reference. 2010-05-25 14:40:47 -07:00

README 

glcpp -- GLSL "C" preprocessor

This is a simple preprocessor designed to provide the preprocessing
needs of the GLSL language. The requirements for this preprocessor are
specified in the GLSL 1.30 specification availble from:

http://www.opengl.org/registry/doc/GLSLangSpec.Full.1.30.08.pdf

This specification is not precise on some semantics, (for example,
#define and #if), defining these merely "as is standard for C++
preprocessors". To fill in these details, I've been using the C99
standard (for which I had a convenient copy) as available from:

http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1124.pdf

Known limitations
-----------------
Macro invocations cannot include embedded newlines.

The __LINE__, __FILE__, and __VERSION__ macros are not yet supported.

The argument of the 'defined' operator cannot yet include enclosing
parentheses.

The #error, #pragma, #extension, #version, and #line macros are not
yet supported.

A file that ends with a function-like macro name as the last
non-whitespace token will result in a parse error, (where it should be
passed through as is).