Author: Armin Rigo <[email protected]>
Branch: jit-simplify-backendintf
Changeset: r50420:6e71614fa5d3
Date: 2011-12-12 11:29 +0100
http://bitbucket.org/pypy/pypy/changeset/6e71614fa5d3/
Log: Expand the comment.
diff --git a/pypy/jit/metainterp/history.py b/pypy/jit/metainterp/history.py
--- a/pypy/jit/metainterp/history.py
+++ b/pypy/jit/metainterp/history.py
@@ -737,10 +737,23 @@
class TargetToken(AbstractDescr):
def __init__(self, targeting_jitcell_token=None):
- # The jitcell to which jumps might result in a jump to this label
+ # Warning, two different jitcell_tokens here!
+ #
+ # * 'targeting_jitcell_token' is only useful for the front-end,
+ # and it means: consider the LABEL that uses this TargetToken.
+ # At this position, the state is logically the one given
+ # by targeting_jitcell_token. So e.g. if we want to enter the
+ # JIT with some given green args, if the jitcell matches, then
+ # we can jump to this LABEL.
+ #
+ # * 'original_jitcell_token' is information from the backend's
+ # point of view: it means that this TargetToken is used in
+ # a LABEL that belongs to either:
+ # - a loop; then 'original_jitcell_token' is this loop
+ # - or a bridge; then 'original_jitcell_token' is the loop
+ # out of which we made this bridge
+ #
self.targeting_jitcell_token = targeting_jitcell_token
-
- # The jitcell where the trace containing the label with this
TargetToken begins
self.original_jitcell_token = None
self.virtual_state = None
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