(gcc-295.info)Reading RTL


Reading RTL
===========

   To read an RTL object from a file, call `read_rtx'.  It takes one
argument, a stdio stream, and returns a single RTL object.

   Reading RTL from a file is very slow.  This is not currently a
problem since reading RTL occurs only as part of building the compiler.

   People frequently have the idea of using RTL stored as text in a
file as an interface between a language front end and the bulk of GNU
CC.  This idea is not feasible.

   GNU CC was designed to use RTL internally only.  Correct RTL for a
given program is very dependent on the particular target machine.  And
the RTL does not contain all the information about the program.

   The proper way to interface GNU CC to a new language front end is
with the "tree" data structure.  There is no manual for this data
structure, but it is described in the files `tree.h' and `tree.def'.


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