Document PyCode_Addr2Line function. (GH-25111)
* Document PyCode_Addr2Line function.
* Clarify when to use PEP 626 line iterators.
diff --git a/Doc/c-api/code.rst b/Doc/c-api/code.rst
index b3a17f1..6e18a42 100644
--- a/Doc/c-api/code.rst
+++ b/Doc/c-api/code.rst
@@ -51,3 +51,11 @@
Return a new empty code object with the specified filename,
function name, and first line number. It is illegal to
:func:`exec` or :func:`eval` the resulting code object.
+
+.. c:function:: int PyCode_Addr2Line(PyCodeObject *co, int byte_offset)
+
+ Return the line number of the instruction that occurs on or before ``byte_offset`` and ends after it.
+ If you just need the line number of a frame, use :c:func:`PyFrame_GetLineNumber` instead.
+
+ For efficiently iterating over the line numbers in a code object, use `the API described in PEP 626
+ <https://www.python.org/dev/peps/pep-0626/#out-of-process-debuggers-and-profilers>`_.