The GNU C preprocessor is implemented as a library, "cpplib", so it can
be easily shared between a stand-alone preprocessor, and a preprocessor
integrated with the C, C++ and Objective-C front ends. It is also
available for use by other programs, though this is not recommended as
its exposed interface has not yet reached a point of reasonable
stability.
The library has been written to be re-entrant, so that it can be used
to preprocess many files simultaneously if necessary. It has also been
written with the preprocessing token as the fundamental unit; the
preprocessor in previous versions of GCC would operate on text strings
as the fundamental unit.
This brief manual documents the internals of cpplib, and explains
some of the tricky issues. It is intended that, along with the comments
in the source code, a reasonably competent C programmer should be able
to figure out what the code is doing, and why things have been
implemented the way they have.
Conventions- Conventions used in the code.
- Lexer
- The combined C, C++ and Objective-C Lexer.
- Hash Nodes
- All identifiers are entered into a hash table.
- Macro Expansion
- Macro expansion algorithm.
- Token Spacing
- Spacing and paste avoidance issues.
- Line Numbering
- Tracking location within files.
- Guard Macros
- Optimizing header files with guard macros.
- Files
- File handling.
- Concept Index
- Index.
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