internal: clean up getfslineno

Everything was using `_pytest.compat.getfslineno` basically, which
wrapped `_pytest._code.source.getfslineno`.

This moves the extra code from there into it directly, and uses the
latter everywhere.

This helps to eventually remove the one in compat eventually, and also
causes less cyclic imports.

src/_pytest/_code/source.py

@@ -17,6 +17,7 @@ from typing import Union
 
 import py
 
+from _pytest.compat import get_real_func
 from _pytest.compat import overload
 from _pytest.compat import TYPE_CHECKING
 
@@ -290,6 +291,13 @@ def getfslineno(obj) -> Tuple[Optional[Union["Literal['']", py.path.local]], int
     """
     from .code import Code
 
+    # xxx let decorators etc specify a sane ordering
+    # NOTE: this used to be done in _pytest.compat.getfslineno, initially added
+    #       in 6ec13a2b9.  It ("place_as") appears to be something very custom.
+    obj = get_real_func(obj)
+    if hasattr(obj, "place_as"):
+        obj = obj.place_as
+
     try:
         code = Code(obj)
     except TypeError:

src/_pytest/compat.py

@@ -22,7 +22,6 @@ from typing import Union
 import attr
 import py
 
-import _pytest
 from _pytest._io.saferepr import saferepr
 from _pytest.outcomes import fail
 from _pytest.outcomes import TEST_OUTCOME
@@ -308,13 +307,10 @@ def get_real_method(obj, holder):
 
 
 def getfslineno(obj) -> Tuple[Union[str, py.path.local], int]:
-    # xxx let decorators etc specify a sane ordering
-    obj = get_real_func(obj)
-    if hasattr(obj, "place_as"):
-        obj = obj.place_as
-    fslineno = _pytest._code.getfslineno(obj)
-    assert isinstance(fslineno[1], int), obj
-    return fslineno
+    """(**Deprecated**, use _pytest._code.source.getfslineno directly)"""
+    from _pytest._code.source import getfslineno
+
+    return getfslineno(obj)
 
 
 def getimfunc(func):

src/_pytest/fixtures.py

@@ -16,12 +16,12 @@ import py
 import _pytest
 from _pytest._code.code import FormattedExcinfo
 from _pytest._code.code import TerminalRepr
+from _pytest._code.source import getfslineno
 from _pytest._io import TerminalWriter
 from _pytest.compat import _format_args
 from _pytest.compat import _PytestWrapper
 from _pytest.compat import get_real_func
 from _pytest.compat import get_real_method
-from _pytest.compat import getfslineno
 from _pytest.compat import getfuncargnames
 from _pytest.compat import getimfunc
 from _pytest.compat import getlocation

src/_pytest/mark/structures.py

@@ -6,9 +6,9 @@ from typing import Set
 
 import attr
 
+from .._code.source import getfslineno
 from ..compat import ascii_escaped
 from ..compat import ATTRS_EQ_FIELD
-from ..compat import getfslineno
 from ..compat import NOTSET
 from _pytest.outcomes import fail
 from _pytest.warning_types import PytestUnknownMarkWarning

src/_pytest/nodes.py

@@ -15,8 +15,8 @@ import _pytest._code
 from _pytest._code.code import ExceptionChainRepr
 from _pytest._code.code import ExceptionInfo
 from _pytest._code.code import ReprExceptionInfo
+from _pytest._code.source import getfslineno
 from _pytest.compat import cached_property
-from _pytest.compat import getfslineno
 from _pytest.compat import TYPE_CHECKING
 from _pytest.config import Config
 from _pytest.config import PytestPluginManager

src/_pytest/python.py

@@ -20,10 +20,10 @@ import _pytest
 from _pytest import fixtures
 from _pytest import nodes
 from _pytest._code import filter_traceback
+from _pytest._code.source import getfslineno
 from _pytest.compat import ascii_escaped
 from _pytest.compat import get_default_arg_names
 from _pytest.compat import get_real_func
-from _pytest.compat import getfslineno
 from _pytest.compat import getimfunc
 from _pytest.compat import getlocation
 from _pytest.compat import is_generator