Top Description Fields Constructors Methods
org.python.core

pack-priv Class CPython311Frame

extends PyFrame<CPython311Code>
Class Inheritance
Imports
java.lang.invoke.MethodHandle, java.util.EnumSet, .Map, org.python.base.InterpreterError, org.python.core.PyCode.Layout, .PyCode.Trait, .PyDict.MergeMode
A PyFrame for executing CPython 3.11 byte code.

Field Summary

Modifier and TypeField and Description
private final Map<Object, Object>
builtins

The built-in objects from func, wrapped (if necessary) to make it a Map.

private static final Object[]
EMPTY_OBJECT_ARRAY

pack-priv final Object[]
fastlocals

All local variables, named in code.

private static final String
NAME_ERROR_MSG

pack-priv Object
returnValue

Assigned eventually by return statement (or stays None).

pack-priv int
stacktop

Index of first empty space on the value stack.

private static final String
VALUE_AFTER_STAR

pack-priv final Object[]
valuestack

Value stack.

Inherited from org.python.core.PyFrame:
backcodefunclocalsTYPE

Constructor Summary

AccessConstructor and Description
protected
CPython311Frame(CPython311Function
that this frame executes
func, Object
local name space (may be null)
locals)

Create a CPython38Frame, which is a PyFrame with the storage and mechanism to execute a module or isolated code object (compiled to a CPython311Code.

Method Summary

Modifier and TypeMethod and Description
pack-priv Object
eval()

Implements abstract org.python.core.PyFrame.eval.

Execute the code in this frame.
private void
getMethod(Object
of which the callable is an attribute
obj, String
of callable attribute
name, int
in stack at which to place results
offset)

A specialised version of object.__getattribute__ specifically to support the LOAD_METHOD and CALL_METHOD opcode pair generated by the CPython byte code compiler.

private static TypeError

Returns:

an exception to throw
kwargsKeyError(KeyError.Duplicate
the duplicate key error
ke, Object
providing a function name for context
func)

Create a TypeError to throw when a duplicate key turns up while merging keyword arguments to a function call.

private static TypeError

Returns:

an exception to throw
kwargsTypeError(Object
providing a function name for context
func, Object
the alleged mapping
kwargs)

Create a TypeError to throw when keyword arguments appear not to be a mapping.

private static SystemError
noLocals(String
"loading", "storing" or "deleting"
action, String
variable name
name)

Generate error to throw when we cannot access locals.

Inherited from org.python.core.PyFrame:
getInterpreterlocalsMapOrNulltoString

Field Detail

builtinsback to summary
private final Map<Object, Object> builtins

The built-in objects from func, wrapped (if necessary) to make it a Map. Inside the wrapper it will be accessed using the Python mapping protocol.

EMPTY_OBJECT_ARRAYback to summary
private static final Object[] EMPTY_OBJECT_ARRAY
fastlocalsback to summary
pack-priv final Object[] fastlocals

All local variables, named in code.layout.localnames.

NAME_ERROR_MSGback to summary
private static final String NAME_ERROR_MSG
returnValueback to summary
pack-priv Object returnValue

Assigned eventually by return statement (or stays None).

stacktopback to summary
pack-priv int stacktop

Index of first empty space on the value stack.

VALUE_AFTER_STARback to summary
private static final String VALUE_AFTER_STAR
valuestackback to summary
pack-priv final Object[] valuestack

Value stack.

Constructor Detail

CPython311Frameback to summary
protected CPython311Frame(CPython311Function func, Object locals)

Create a CPython38Frame, which is a PyFrame with the storage and mechanism to execute a module or isolated code object (compiled to a CPython311Code.

This will set the func and (sometimes) locals fields of the frame. The globals and builtins properties, exposed to Python as f_globals and f_builtins, are determined by func.

The func argument also locates the code object for the frame, the properties of which determine many characteristics of the frame.

  • If the code argument has the Trait#NEWLOCALS the locals argument is ignored.
    • If the code does not additionally have the trait Trait#OPTIMIZED, a new empty dict will be provided as locals.
    • Otherwise, the code has the trait OPTIMIZED, and locals will be null until possibly set later.
  • Otherwise, code does not have the trait NEWLOCALS and expects an object with the map protocol to act as PyFrame#locals.
    • If the argument locals is not null it specifies locals.
    • Otherwise, the argument locals is null and locals will be the same as #globals.
Parameters
func:CPython311Function

that this frame executes

locals:Object

local name space (may be null)

Method Detail

evalback to summary
pack-priv Object eval()

Implements abstract org.python.core.PyFrame.eval.

Doc from org.python.core.PyFrame.eval.

Execute the code in this frame.

Returns:Object

return value of the frame

Annotations
@Override

getMethodback to summary
private void getMethod(Object obj, String name, int offset) throws AttributeError, Throwable

A specialised version of object.__getattribute__ specifically to support the LOAD_METHOD and CALL_METHOD opcode pair generated by the CPython byte code compiler. This method will place two entries in the stack at the offset given that are either:

  1. an unbound method and the object passed (obj), or
  2. null and a bound method object.

The normal behaviour of object.__getattribute__ is represented by case 2.

Case 1 supports an optimisation that is possible when the type of the self object obj has not overridden __getattribute__, and the name resolves to a regular method in it. CALL_METHOD will detect and use this optimised form if the first element is not null.

Parameters
obj:Object

of which the callable is an attribute

name:String

of callable attribute

offset:int

in stack at which to place results

Exceptions
AttributeError:
if the named attribute does not exist
Throwable:
from other errors
kwargsKeyErrorback to summary
private static TypeError kwargsKeyError(KeyError.Duplicate ke, Object func)

Create a TypeError to throw when a duplicate key turns up while merging keyword arguments to a function call.

Parameters
ke:KeyError.Duplicate

the duplicate key error

func:Object

providing a function name for context

Returns:TypeError

an exception to throw

kwargsTypeErrorback to summary
private static TypeError kwargsTypeError(Object func, Object kwargs)

Create a TypeError to throw when keyword arguments appear not to be a mapping. dict.merge raises AttributeError (percolated from an attempt to get 'keys' attribute) if its second argument is not a mapping, which we convert to a TypeError.

Parameters
func:Object

providing a function name for context

kwargs:Object

the alleged mapping

Returns:TypeError

an exception to throw

noLocalsback to summary
private static SystemError noLocals(String action, String name)

Generate error to throw when we cannot access locals.

Parameters
action:String

"loading", "storing" or "deleting"

name:String

variable name