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|
#------------------------------------------------------------------------------
# Copyright (c) 2013-2025, Nucleic Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file LICENSE, distributed with this software.
#------------------------------------------------------------------------------
from contextlib import contextmanager
from types import FunctionType
import bytecode as bc
from .code_tracing import inject_tracing, inject_inversion
from .expression_engine import HandlerPair
from .standard_handlers import (
StandardReadHandler, StandardWriteHandler, StandardTracedReadHandler,
StandardInvertedWriteHandler
)
def optimize_locals(bytecode):
""" Optimize the bytecode for fast locals access.
All STORE_NAME opcodes will be replaced with STORE_FAST. Names
which are stored and then loaded via LOAD_NAME are rewritten to
LOAD_FAST and DELETE_NAME is rewritten to DELETE_FAST. This
transformation is performed in-place.
Parameters
----------
bytecode : bc.Bytecode
Bytecode to modify.
"""
fast_locals = set()
for instr in bytecode:
# Filter out SetLineno and Label
if not isinstance(instr, bc.Instr):
continue
if instr.name == "STORE_NAME":
fast_locals.add(instr.arg)
instr.name = "STORE_FAST"
for instr in bytecode:
# Filter out SetLineno and Label
if not isinstance(instr, bc.Instr):
continue
i_name, i_arg = instr.name, instr.arg
if i_name == "LOAD_NAME" and i_arg in fast_locals:
instr.name = "LOAD_FAST"
elif i_name == "DELETE_NAME" and i_arg in fast_locals:
instr.name = "DELETE_FAST"
bytecode.update_flags()
def gen_simple(code, f_globals):
""" Generate a simple function from a code object.
Parameters
----------
code : CodeType
The code object created by the Enaml compiler.
f_globals : dict
The global scope for the returned function.
Returns
-------
result : FunctionType
A new function with optimized local variable access.
"""
bc_code = bc.Bytecode.from_code(code)
optimize_locals(bc_code)
bc_code.flags ^= (bc_code.flags & bc.CompilerFlags.NEWLOCALS)
new_code = bc_code.to_code()
return FunctionType(new_code, f_globals)
def gen_tracer(code, f_globals):
""" Generate a trace function from a code object.
Parameters
----------
code : CodeType
The code object created by the Enaml compiler.
f_globals : dict
The global scope for the returned function.
Returns
-------
result : FunctionType
A new function with optimized local variable access
and instrumentation for invoking a code tracer.
"""
bc_code = bc.Bytecode.from_code(code)
optimize_locals(bc_code)
bc_code = inject_tracing(bc_code)
bc_code.flags ^= (bc_code.flags & bc.CompilerFlags.NEWLOCALS)
bc_code.argnames = ['_[tracer]'] + bc_code.argnames
bc_code.argcount += 1
new_code = bc_code.to_code()
return FunctionType(new_code, f_globals)
def gen_inverter(code, f_globals):
""" Generate an inverter function from a code object.
Parameters
----------
code : CodeType
The code object created by the Enaml compiler.
f_globals : dict
The global scope for the returned function.
Returns
-------
result : FunctionType
A new function with optimized local variable access
and instrumentation for inverting the operation.
"""
bc_code = bc.Bytecode.from_code(code)
optimize_locals(bc_code)
bc_code = inject_inversion(bc_code)
bc_code.flags ^= (bc_code.flags & bc.CompilerFlags.NEWLOCALS)
bc_code.argnames = ['_[inverter]', '_[value]'] + bc_code.argnames
bc_code.argcount += 2
new_code = bc_code.to_code()
return FunctionType(new_code, f_globals)
def op_simple(code, scope_key, f_globals):
""" The default Enaml operator function for the `=` operator.
This operator generates a simple function with optimized local
access and hooks it up to a StandardReadHandler. This operator
does not support write semantics.
Parameters
----------
code : CodeType
The code object created by the Enaml compiler.
scope_key : object
The block scope key created by the Enaml compiler.
f_globals : dict
The global scope for the for code execution.
Returns
-------
result : HandlerPair
A pair with the reader set to a StandardReadHandler.
"""
func = gen_simple(code, f_globals)
reader = StandardReadHandler(func=func, scope_key=scope_key)
return HandlerPair(reader=reader)
def op_notify(code, scope_key, f_globals):
""" The default Enaml operator function for the `::` operator.
This operator generates a simple function with optimized local
access and hooks it up to a StandardWriteHandler. This operator
does not support read semantics.
Parameters
----------
code : CodeType
The code object created by the Enaml compiler.
scope_key : object
The block scope key created by the Enaml compiler.
f_globals : dict
The global scope for the for code execution.
Returns
-------
result : HandlerPair
A pair with the writer set to a StandardWriteHandler.
"""
func = gen_simple(code, f_globals)
writer = StandardWriteHandler(func=func, scope_key=scope_key)
return HandlerPair(writer=writer)
def op_subscribe(code, scope_key, f_globals):
""" The default Enaml operator function for the `<<` operator.
This operator generates a tracer function with optimized local
access and hooks it up to a StandardTracedReadHandler. This
operator does not support write semantics.
Parameters
----------
code : CodeType
The code object created by the Enaml compiler.
scope_key : object
The block scope key created by the Enaml compiler.
f_globals : dict
The global scope for the for code execution.
Returns
-------
result : HandlerPair
A pair with the reader set to a StandardTracedReadHandler.
"""
func = gen_tracer(code, f_globals)
reader = StandardTracedReadHandler(func=func, scope_key=scope_key)
return HandlerPair(reader=reader)
def op_update(code, scope_key, f_globals):
""" The default Enaml operator function for the `>>` operator.
This operator generates a inverter function with optimized local
access and hooks it up to a StandardInvertedWriteHandler. This
operator does not support read semantics.
Parameters
----------
code : CodeType
The code object created by the Enaml compiler.
scope_key : object
The block scope key created by the Enaml compiler.
f_globals : dict
The global scope for the for code execution.
Returns
-------
result : HandlerPair
A pair with the writer set to a StandardInvertedWriteHandler.
"""
func = gen_inverter(code, f_globals)
writer = StandardInvertedWriteHandler(func=func, scope_key=scope_key)
return HandlerPair(writer=writer)
def op_delegate(code, scope_key, f_globals):
""" The default Enaml operator function for the `:=` operator.
This operator combines the '<<' and the '>>' operators into a
single operator. It supports both read and write semantics.
Parameters
----------
code : CodeType
The code object created by the Enaml compiler.
scope_key : object
The block scope key created by the Enaml compiler.
f_globals : dict
The global scope for the for code execution.
Returns
-------
result : HandlerPair
A pair with the reader set to a StandardTracedReadHandler and
the writer set to a StandardInvertedWriteHandler.
"""
p1 = op_subscribe(code, scope_key, f_globals)
p2 = op_update(code, scope_key, f_globals)
return HandlerPair(reader=p1.reader, writer=p2.writer)
DEFAULT_OPERATORS = {
'=': op_simple,
'::': op_notify,
'>>': op_update,
'<<': op_subscribe,
':=': op_delegate,
}
#: The internal stack of operators pushed by the operator context.
__operator_stack = []
@contextmanager
def operator_context(ops, union=False):
""" Push operators onto the stack for the duration of the context.
Parameters
----------
ops : dict
The dictionary of operators to push onto the stack.
union : bool, optional
Whether or to union the operators with the existing operators
on the top of the stack. The default is False.
"""
if union:
new = dict(__get_operators())
new.update(ops)
ops = new
__operator_stack.append(ops)
yield
__operator_stack.pop()
def __get_default_operators():
""" Set the default operators.
This function is for internal use only and may disappear at any time.
"""
return DEFAULT_OPERATORS
def __set_default_operators(ops):
""" Set the default operators.
This function is for internal use only and may disappear at any time.
"""
global DEFAULT_OPERATORS
DEFAULT_OPERATORS = ops
def __get_operators():
""" An internal routine used to get the operators for a given class.
Operators resolution is performed in the following order:
- The operators on the top of the operators stack.
- The default operators via __get_default_operators()
This function may disappear at any time.
"""
if __operator_stack:
return __operator_stack[-1]
return __get_default_operators()
|
