bpo-44348: Move trace-info to thread-state (GH-26623)

* Move trace-info to thread state.

* Correct output for pdb when turning on tracing in middle of line

Author: markshannon

Include/cpython/pystate.h

@@ -29,6 +29,11 @@ typedef int (*Py_tracefunc)(PyObject *, PyFrameObject *, int, PyObject *);
 #define PyTrace_OPCODE 7
 
 
+typedef struct {
+    PyCodeObject *code; // The code object for the bounds. May be NULL.
+    PyCodeAddressRange bounds; // Only valid if code != NULL.
+} PyTraceInfo;
+
 typedef struct _cframe {
     /* This struct will be threaded through the C stack
      * allowing fast access to per-thread state that needs
@@ -160,6 +165,7 @@ struct _ts {
     uint64_t id;
 
     CFrame root_cframe;
+    PyTraceInfo trace_info;
 
     _PyStackChunk *datastack_chunk;
     PyObject **datastack_top;

Lib/test/test_pdb.py

@@ -1288,8 +1288,8 @@ def test_pdb_issue_20766():
     -> print('pdb %d: %s' % (i, sess._previous_sigint_handler))
     (Pdb) continue
     pdb 1: <built-in function default_int_handler>
-    > <doctest test.test_pdb.test_pdb_issue_20766[0]>(5)test_function()
-    -> sess.set_trace(sys._getframe())
+    > <doctest test.test_pdb.test_pdb_issue_20766[0]>(6)test_function()
+    -> print('pdb %d: %s' % (i, sess._previous_sigint_handler))
     (Pdb) continue
     pdb 2: <built-in function default_int_handler>
     """