[pypy-svn] r14175 - pypy/dist/pypy/documentation

pedronis at codespeak.net pedronis at codespeak.net
Sun Jul 3 19:59:20 CEST 2005

Author: pedronis
Date: Sun Jul  3 19:59:19 2005
New Revision: 14175

   pypy/dist/pypy/documentation/ext-functions-draft.txt   (contents, props changed)
draft of text describing our current thinking on how to express and implement calls to external 

Added: pypy/dist/pypy/documentation/ext-functions-draft.txt
--- (empty file)
+++ pypy/dist/pypy/documentation/ext-functions-draft.txt	Sun Jul  3 19:59:19 2005
@@ -0,0 +1,23 @@
+example of interp-level code needing to somehow call an external function:
+    def open(space, w_fname):
+        fname = space.str_w(fname)
+        fd = os.open(fname)
+        return space.wrap(fd)
+* os.open will be special-cased along all translation levels, there
+  will be a table mapping "sys calls" functions to the information
+  needed by the various level.
+* annotation/builtin.py will take information from the common table to
+  annotate the calls.
+* rtyper will replace the calls with for testing or dummy lowlevel
+  functions (ll_os_open for os.open), specified somehow trough the
+  table (issue: how to annotate these helper calls avoiding making
+  copies as in the usual case, so that the backends can recognize them)
+* the backends will have implementations for these helper functions
+  (to allow writing such implementations we will need a way to assign
+  fixed names for some of the defined lltypes introduced by the rtyper)

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