399 lines
15 KiB
Python
399 lines
15 KiB
Python
import collections
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import dataclasses
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import re
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import sys
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import types
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from typing import Counter, Dict, List, Optional
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import torch.nn
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from . import utils
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from .bytecode_transformation import (
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create_call_function,
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create_dup_top,
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create_instruction,
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create_load_global,
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create_rot_n,
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Instruction,
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)
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from .exc import unimplemented
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from .source import AttrSource, Source
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from .utils import is_safe_constant, rot_n_helper
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from .variables.base import VariableTracker
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from .variables.nn_module import NNModuleVariable
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from .variables.tensor import (
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NumpyNdarrayVariable,
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SymNodeVariable,
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TensorVariable,
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UnspecializedPythonVariable,
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)
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from .variables.torch_function import TensorWithTFOverrideVariable
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@dataclasses.dataclass
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class GraphOutputEntry:
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index: int
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variable: VariableTracker
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class PyCodegen:
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"""
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Helper class uses for constructing Python bytecode
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"""
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def __init__(
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self,
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tx=None,
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root: Optional[torch.nn.Module] = None,
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graph_output_var: Optional[str] = None,
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tempvars=None,
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):
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self.root = root
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self.top_of_stack: Optional[VariableTracker] = None
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self.uses: Counter[VariableTracker] = collections.Counter()
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self.graph_outputs: Dict[int, GraphOutputEntry] = {}
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self._output: List[Instruction] = []
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self.tempvars = tempvars or {}
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self.tx = tx
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self.graph_output_var = graph_output_var
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self.code_options = self.tx.output.code_options
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self.cell_and_freevars = self.tx.cell_and_freevars
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self.new_var = self.tx.output.new_var
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self.mutable_side_effects_from_source = False
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self.value_from_source: bool = True
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def restore_stack(self, stack_values, *, value_from_source=True):
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prior = self.mutable_side_effects_from_source
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self.mutable_side_effects_from_source = True
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prev = self.value_from_source
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self.value_from_source &= value_from_source
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try:
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self.foreach(stack_values)
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finally:
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self.mutable_side_effects_from_source = prior
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self.value_from_source = prev
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def graph_output_vars(self):
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return [x.variable for x in self.graph_outputs.values()]
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def call_reconstruct(self, value):
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res = value.reconstruct(self)
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assert res is None, f"reconstruct!=None {value}"
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def __call__(self, value, allow_cache=True):
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"""Generate code such that top-of-stack (TOS) is set to value"""
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if isinstance(value, Source):
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self.call_reconstruct(value)
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self.clear_tos()
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return
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assert isinstance(value, VariableTracker)
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output = self._output
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graph_outputs = self.graph_outputs
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if self.top_of_stack is value and allow_cache:
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output.append(create_dup_top())
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return
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if self.mutable_side_effects_from_source:
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# this is needed to get aliasing relationships right
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# value.mutable_local.source will get mutated to hold `value`
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# mutable_side_effects_from_source=False is used to codegen the mutation
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# mutable_side_effects_from_source=True is used to codegen a reference
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from .side_effects import MutableSideEffects
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if isinstance(value.mutable_local, MutableSideEffects):
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self(value.mutable_local.source)
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return
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if allow_cache:
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if value.mutable_local and value.mutable_local in self.tempvars:
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output.append(self.create_load(self.tempvars[value.mutable_local]))
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self.top_of_stack = value
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return
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if self.tempvars.get(value) is not None:
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output.append(self.create_load(self.tempvars[value]))
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self.top_of_stack = value
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return
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if value.source is not None and allow_cache and self.value_from_source:
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self.call_reconstruct(value.source)
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elif value.is_python_constant() and is_safe_constant(
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value.as_python_constant()
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):
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output.append(self.create_load_const(value.as_python_constant()))
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elif isinstance(value, TensorWithTFOverrideVariable):
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graph_outputs_key = self.add_graph_output(value)
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self.load_import_from(utils.__name__, "to_subclass")
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self.load_graph_output(graph_outputs[graph_outputs_key].index)
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output.append(
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self.create_load_global(
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value.global_mangled_class_name(self.tx), False, add=True
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)
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)
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output.extend(create_call_function(2, True))
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elif isinstance(
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value,
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(
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TensorVariable,
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SymNodeVariable,
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UnspecializedPythonVariable,
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NumpyNdarrayVariable,
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),
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):
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graph_outputs_key = self.add_graph_output(value)
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if isinstance(value, NumpyNdarrayVariable):
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self.load_import_from(utils.__name__, "to_numpy_helper")
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self.load_graph_output(graph_outputs[graph_outputs_key].index)
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if isinstance(value, NumpyNdarrayVariable):
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output.extend(create_call_function(1, True))
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elif isinstance(value, UnspecializedPythonVariable) and value.need_unwrap:
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output.extend(
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[self.create_load_attr("item")] + create_call_function(0, True)
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)
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elif isinstance(value, NNModuleVariable):
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parts = value.module_key.split(".")
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if parts[0] in self.code_options["co_varnames"]:
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output.append(self.create_load(parts[0]))
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parts = parts[1:]
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else:
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assert self.root is not None
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output.append(self.create_load_output(self.root))
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for part in parts:
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output.append(self.create_load_attr(part))
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else:
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self.uses[value] += 1
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try:
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self.call_reconstruct(value)
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except NotImplementedError:
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unimplemented(f"reconstruct: {value}")
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if allow_cache and value in self.tempvars:
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self._output.append(create_dup_top())
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self.add_cache(value)
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self.top_of_stack = value
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def add_graph_output(self, value):
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graph_outputs_key = id(value.as_proxy())
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if graph_outputs_key not in self.graph_outputs:
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self.graph_outputs[graph_outputs_key] = GraphOutputEntry(
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len(self.graph_outputs), value
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)
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return graph_outputs_key
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def load_graph_output(self, index):
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output = self._output
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output.append(self.create_load(self.graph_output_var))
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output.append(self._create_load_const(index))
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output.append(create_instruction("BINARY_SUBSCR"))
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def add_cache(self, value):
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var = self.new_var()
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self.tempvars[value] = var
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if value.mutable_local:
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self.tempvars[value.mutable_local] = var
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self._output.append(self.create_store(var))
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def foreach(self, items):
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for i in items:
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self(i)
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def setup_globally_cached(self, name, value, push_null):
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"""Store value in a new global"""
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name = re.sub(r"[^a-zA-Z0-9_]+", "_", name)
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f_globals = self.tx.f_globals
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if name in f_globals:
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assert id(f_globals[name]) == id(value)
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else:
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f_globals[name] = value
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return [self.create_load_global(name, push_null, add=True)]
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def clear_tos(self):
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self.top_of_stack = None
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def append_output(self, inst):
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assert isinstance(inst, Instruction)
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self._output.append(inst)
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self.clear_tos()
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def extend_output(self, insts):
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assert all(isinstance(x, Instruction) for x in insts)
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self._output.extend(insts)
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self.clear_tos()
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def get_instructions(self) -> List[Instruction]:
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return self._output
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def create_load(self, name) -> Instruction:
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if name in self.cell_and_freevars():
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return create_instruction("LOAD_DEREF", argval=name)
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assert name in self.code_options["co_varnames"], f"{name} missing"
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return create_instruction("LOAD_FAST", argval=name)
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def create_load_closure(self, name) -> Instruction:
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assert name in self.cell_and_freevars()
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return create_instruction("LOAD_CLOSURE", argval=name)
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def create_store(self, name) -> Instruction:
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if name in self.cell_and_freevars():
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return create_instruction("STORE_DEREF", argval=name)
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assert name in self.code_options["co_varnames"]
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return create_instruction("STORE_FAST", argval=name)
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def create_load_global(self, name, push_null, add=False) -> Instruction:
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if add:
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self.tx.output.update_co_names(name)
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assert name in self.code_options["co_names"], f"{name} not in co_names"
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return create_load_global(name, push_null)
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def create_load_const(self, value) -> Instruction:
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assert is_safe_constant(value), f"unsafe constant {value}"
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return self._create_load_const(value)
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def _create_load_const(self, value) -> Instruction:
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return create_instruction("LOAD_CONST", argval=value)
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create_load_output = _create_load_const
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def create_load_method(self, name):
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self.tx.output.update_co_names(name)
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return create_instruction("LOAD_METHOD", argval=name)
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def create_load_attr(self, name) -> Instruction:
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if name not in self.code_options["co_names"]:
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self.code_options["co_names"] += (name,)
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return create_instruction("LOAD_ATTR", argval=name)
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def load_attr(self, name):
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self.append_output(self.create_load_attr(name))
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def create_load_attrs(self, names):
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return [self.create_load_attr(name) for name in names.split(".")]
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def create_store_attr(self, name) -> Instruction:
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if name not in self.code_options["co_names"]:
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self.code_options["co_names"] += (name,)
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return create_instruction("STORE_ATTR", argval=name)
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def store_attr(self, name):
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self.append_output(self.create_store_attr(name))
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def load_function_name(self, fn_name, push_null, num_on_stack=0):
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"""Load the global fn_name on the stack num_on_stack down"""
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output = []
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if push_null and sys.version_info >= (3, 11):
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output.extend(
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[create_instruction("PUSH_NULL"), *self.rot_n(num_on_stack + 1)]
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)
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output.extend(
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[
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self.create_load_global(fn_name, False, add=True),
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*self.rot_n(num_on_stack + 1),
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]
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)
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return output
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def rot_n(self, n):
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try:
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return create_rot_n(n)
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except AttributeError:
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# desired rotate bytecode doesn't exist, generate equivalent bytecode
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return [
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create_instruction("BUILD_TUPLE", arg=n),
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self._create_load_const(rot_n_helper(n)),
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*create_rot_n(2),
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create_instruction("CALL_FUNCTION_EX", arg=0),
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create_instruction("UNPACK_SEQUENCE", arg=n),
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]
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def pop_null(self):
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# POP_TOP doesn't work for null, so we pop nulls by pushing in a
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# nop function, calling it (which consumes the null), and popping the result.
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assert sys.version_info >= (3, 11)
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return [
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self._create_load_const(lambda: None),
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*create_call_function(0, False),
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create_instruction("POP_TOP"),
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]
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def call_function(self, nargs: int, push_null: bool):
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self.extend_output(create_call_function(nargs, push_null=push_null))
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def dup_top(self):
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self.append_output(create_dup_top())
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def store(self, varname):
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self.append_output(self.create_store(varname))
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def make_function_with_closure(
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self, fn_name: str, code: types.CodeType, push_null: bool, num_on_stack=0
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):
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freevars = code.co_freevars
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assert freevars
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output = self._output
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if sys.version_info >= (3, 11) and push_null:
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output.append(create_instruction("PUSH_NULL"))
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output.extend(self.rot_n(num_on_stack + 1))
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for var in freevars:
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assert var in self.cell_and_freevars()
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output.append(create_instruction("LOAD_CLOSURE", argval=var))
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output.append(create_instruction("BUILD_TUPLE", arg=len(freevars)))
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output.append(self.create_load_const(code))
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if sys.version_info < (3, 11):
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output.append(self.create_load_const(fn_name))
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output.append(create_instruction("MAKE_FUNCTION", arg=0x08))
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output.extend(self.rot_n(num_on_stack + 1))
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self.clear_tos()
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def create_load_python_module(self, mod, push_null) -> Instruction:
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"""
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Generate a LOAD_GLOBAL instruction to fetch a given python module.
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"""
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output = self.tx.output
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global_scope = output.global_scope
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name = re.sub(r"^.*[.]", "", mod.__name__)
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if global_scope.get(name, None) is mod:
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return self.create_load_global(name, push_null, add=True)
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prefix = f"___module_{name}"
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global_name = self.tx.output.install_global_by_id(prefix, mod)
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return self.create_load_global(global_name, push_null, add=True)
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def make_call_generated_code(self, fn_name: str) -> None:
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"""Call the generated code function stored in fn_name"""
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self.extend_output(self.load_function_name(fn_name, True))
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graphargs = self.tx.output.graphargs
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for arg in graphargs:
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if arg.is_unspecialized:
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self.extend_output(
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[
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self.create_load_python_module(torch, True),
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self.create_load_attr("as_tensor"),
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]
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)
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self.call_reconstruct(arg)
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self.extend_output(create_call_function(1, False))
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else:
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self.call_reconstruct(arg)
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self.extend_output(create_call_function(len(graphargs), False))
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def load_import_from(self, module_name, object_name) -> None:
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self(AttrSource(self.tx.import_source(module_name), object_name))
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def create_call_function_kw(self, nargs, kw_names, push_null) -> List[Instruction]:
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if sys.version_info >= (3, 11):
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output = create_call_function(nargs, push_null)
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assert output[-2].opname == "PRECALL"
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kw_names_inst = create_instruction("KW_NAMES", argval=kw_names)
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output.insert(-2, kw_names_inst)
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return output
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return [
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self.create_load_const(kw_names),
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create_instruction("CALL_FUNCTION_KW", arg=nargs),
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]
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