Issue #29407: Merge from 3.5

1 files changed, 62 insertions, 19 deletions

diff --git a/Tools/gdb/libpython.py b/Tools/gdb/libpython.py
index ed515c0017..cc1afbe16d 100755
--- a/Tools/gdb/libpython.py
+++ b/Tools/gdb/libpython.py
@@ -44,7 +44,7 @@ The module also extends gdb with some python-specific commands.
 # NOTE: some gdbs are linked with Python 3, so this file should be dual-syntax
 # compatible (2.6+ and 3.0+).  See #19308.
 
-from __future__ import print_function, with_statement
+from __future__ import print_function
 import gdb
 import os
 import locale
@@ -666,8 +666,9 @@ class PyDictObjectPtr(PyObjectPtr):
         '''
         keys = self.field('ma_keys')
         values = self.field('ma_values')
-        for i in safe_range(keys['dk_size']):
-            ep = keys['dk_entries'].address + i
+        entries, nentries = self._get_entries(keys)
+        for i in safe_range(nentries):
+            ep = entries[i]
             if long(values):
                 pyop_value = PyObjectPtr.from_pyobject_ptr(values[i])
             else:
@@ -707,6 +708,33 @@ class PyDictObjectPtr(PyObjectPtr):
             pyop_value.write_repr(out, visited)
         out.write('}')
 
+    def _get_entries(self, keys):
+        dk_nentries = int(keys['dk_nentries'])
+        dk_size = int(keys['dk_size'])
+        try:
+            # <= Python 3.5
+            return keys['dk_entries'], dk_size
+        except gdb.error:
+            # >= Python 3.6
+            pass
+
+        if dk_size <= 0xFF:
+            offset = dk_size
+        elif dk_size <= 0xFFFF:
+            offset = 2 * dk_size
+        elif dk_size <= 0xFFFFFFFF:
+            offset = 4 * dk_size
+        else:
+            offset = 8 * dk_size
+
+        ent_addr = keys['dk_indices']['as_1'].address
+        ent_addr = ent_addr.cast(_type_unsigned_char_ptr()) + offset
+        ent_ptr_t = gdb.lookup_type('PyDictKeyEntry').pointer()
+        ent_addr = ent_addr.cast(ent_ptr_t)
+
+        return ent_addr, dk_nentries
+
+
 class PyListObjectPtr(PyObjectPtr):
     _typename = 'PyListObject'
 
@@ -1464,23 +1492,38 @@ class Frame(object):
          '''
         if self.is_waiting_for_gil():
             return 'Waiting for the GIL'
-        elif self.is_gc_collect():
+
+        if self.is_gc_collect():
             return 'Garbage-collecting'
-        else:
-            # Detect invocations of PyCFunction instances:
-            older = self.older()
-            if older and older._gdbframe.name() == 'PyCFunction_Call':
-                # Within that frame:
-                #   "func" is the local containing the PyObject* of the
-                # PyCFunctionObject instance
-                #   "f" is the same value, but cast to (PyCFunctionObject*)
-                #   "self" is the (PyObject*) of the 'self'
-                try:
-                    # Use the prettyprinter for the func:
-                    func = older._gdbframe.read_var('func')
-                    return str(func)
-                except RuntimeError:
-                    return 'PyCFunction invocation (unable to read "func")'
+
+        # Detect invocations of PyCFunction instances:
+        older = self.older()
+        if not older:
+            return False
+
+        caller = older._gdbframe.name()
+        if not caller:
+            return False
+
+        if caller == 'PyCFunction_Call':
+            # Within that frame:
+            #   "func" is the local containing the PyObject* of the
+            # PyCFunctionObject instance
+            #   "f" is the same value, but cast to (PyCFunctionObject*)
+            #   "self" is the (PyObject*) of the 'self'
+            try:
+                # Use the prettyprinter for the func:
+                func = older._gdbframe.read_var('func')
+                return str(func)
+            except RuntimeError:
+                return 'PyCFunction invocation (unable to read "func")'
+
+        elif caller == '_PyCFunction_FastCallDict':
+            try:
+                func = older._gdbframe.read_var('func_obj')
+                return str(func)
+            except RuntimeError:
+                return 'PyCFunction invocation (unable to read "func_obj")'
 
         # This frame isn't worth reporting:
         return False