29.12 Naming Conventions for GNAT Source Files
In order to examine the workings of the GNAT system, the following
brief description of its organization may be helpful:
- Files with prefix sc contain the lexical scanner.
- All files prefixed with par are components of the parser. The
numbers correspond to chapters of the Ada Reference Manual. For example,
parsing of select statements can be found in par-ch9.adb.
- All files prefixed with sem perform semantic analysis. The
numbers correspond to chapters of the Ada standard. For example, all
issues involving context clauses can be found in sem_ch10.adb. In
addition, some features of the language require sufficient special processing
to justify their own semantic files: sem_aggr for aggregates, sem_disp for
dynamic dispatching, etc.
- All files prefixed with exp perform normalization and
expansion of the intermediate representation (abstract syntax tree, or AST).
these files use the same numbering scheme as the parser and semantics files.
For example, the construction of record initialization procedures is done in
- The files prefixed with bind implement the binder, which
verifies the consistency of the compilation, determines an order of
elaboration, and generates the bind file.
- The files atree.ads and atree.adb detail the low-level
data structures used by the front-end.
- The files sinfo.ads and sinfo.adb detail the structure of
the abstract syntax tree as produced by the parser.
- The files einfo.ads and einfo.adb detail the attributes of
all entities, computed during semantic analysis.
- Library management issues are dealt with in files with prefix
- Ada files with the prefix a- are children of
defined in Annex A.
- Files with prefix i- are children of
defined in Annex B.
- Files with prefix s- are children of
System. This includes
both language-defined children and GNAT run-time routines.
- Files with prefix g- are children of
GNAT. These are useful
general-purpose packages, fully documented in their specs. All
the other .c files are modifications of common gcc files.