Author: Armin Rigo <ar...@tunes.org>
Branch: stmgc-c7-rewindjmp
Changeset: r72845:35c9220c71f4
Date: 2014-08-17 17:38 +0200
http://bitbucket.org/pypy/pypy/changeset/35c9220c71f4/
Log: Document the kind of trace produced by jit_stm_xxx(), before
refactoring it.
diff --git a/rpython/rlib/rstm.py b/rpython/rlib/rstm.py
--- a/rpython/rlib/rstm.py
+++ b/rpython/rlib/rstm.py
@@ -53,6 +53,26 @@
if llop.stm_should_break_transaction(lltype.Bool):
llop.stm_transaction_break(lltype.Void)
+# Typical usage of the following two functions:
+#
+# just after jit_merge_point:
+# if rstm.jit_stm_should_break_transaction(False):
+# rstm.jit_stm_transaction_break_point()
+#
+# just before can_enter_jit:
+# if rstm.jit_stm_should_break_transaction(True):
+# rstm.jit_stm_transaction_break_point()
+#
+# resulting JIT trace (common case):
+# ...
+# call_release_gil(...)
+# stm_transaction_break(0) # in-line, because we expect "inevitable"
+# guard_not_forced()
+# ...
+# i1 = stm_should_break_transaction()
+# guard_false(i1) # out-of-line, because rarely needed
+# jump()
+#
def jit_stm_transaction_break_point():
# XXX REFACTOR AWAY
if we_are_translated():
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