Current File : //lib/python3/dist-packages/mypyc/irbuild/main.py
"""Transform a mypy AST to the IR form (Intermediate Representation).
For example, consider a function like this:
def f(x: int) -> int:
return x * 2 + 1
It would be translated to something that conceptually looks like this:
r0 = 2
r1 = 1
r2 = x * r0 :: int
r3 = r2 + r1 :: int
return r3
This module deals with the module-level IR transformation logic and
putting it all together. The actual IR is implemented in mypyc.ir.
For the core of the IR transform implementation, look at build_ir()
below, mypyc.irbuild.builder, and mypyc.irbuild.visitor.
"""
from mypy.backports import OrderedDict
from typing import List, Dict, Callable, Any, TypeVar, cast
from mypy.nodes import MypyFile, Expression, ClassDef
from mypy.types import Type
from mypy.state import strict_optional_set
from mypy.build import Graph
from mypyc.common import TOP_LEVEL_NAME
from mypyc.errors import Errors
from mypyc.options import CompilerOptions
from mypyc.ir.rtypes import none_rprimitive
from mypyc.ir.module_ir import ModuleIR, ModuleIRs
from mypyc.ir.func_ir import FuncIR, FuncDecl, FuncSignature
from mypyc.irbuild.prebuildvisitor import PreBuildVisitor
from mypyc.irbuild.vtable import compute_vtable
from mypyc.irbuild.prepare import build_type_map, find_singledispatch_register_impls
from mypyc.irbuild.builder import IRBuilder
from mypyc.irbuild.visitor import IRBuilderVisitor
from mypyc.irbuild.mapper import Mapper
# The stubs for callable contextmanagers are busted so cast it to the
# right type...
F = TypeVar('F', bound=Callable[..., Any])
strict_optional_dec = cast(Callable[[F], F], strict_optional_set(True))
@strict_optional_dec # Turn on strict optional for any type manipulations we do
def build_ir(modules: List[MypyFile],
graph: Graph,
types: Dict[Expression, Type],
mapper: 'Mapper',
options: CompilerOptions,
errors: Errors) -> ModuleIRs:
"""Build IR for a set of modules that have been type-checked by mypy."""
build_type_map(mapper, modules, graph, types, options, errors)
singledispatch_info = find_singledispatch_register_impls(modules, errors)
result: ModuleIRs = OrderedDict()
# Generate IR for all modules.
class_irs = []
for module in modules:
# First pass to determine free symbols.
pbv = PreBuildVisitor(errors, module, singledispatch_info.decorators_to_remove)
module.accept(pbv)
# Construct and configure builder objects (cyclic runtime dependency).
visitor = IRBuilderVisitor()
builder = IRBuilder(
module.fullname, types, graph, errors, mapper, pbv, visitor, options,
singledispatch_info.singledispatch_impls,
)
visitor.builder = builder
# Second pass does the bulk of the work.
transform_mypy_file(builder, module)
module_ir = ModuleIR(
module.fullname,
list(builder.imports),
builder.functions,
builder.classes,
builder.final_names
)
result[module.fullname] = module_ir
class_irs.extend(builder.classes)
# Compute vtables.
for cir in class_irs:
if cir.is_ext_class:
compute_vtable(cir)
return result
def transform_mypy_file(builder: IRBuilder, mypyfile: MypyFile) -> None:
"""Generate IR for a single module."""
if mypyfile.fullname in ('typing', 'abc'):
# These module are special; their contents are currently all
# built-in primitives.
return
builder.set_module(mypyfile.fullname, mypyfile.path)
classes = [node for node in mypyfile.defs if isinstance(node, ClassDef)]
# Collect all classes.
for cls in classes:
ir = builder.mapper.type_to_ir[cls.info]
builder.classes.append(ir)
builder.enter('<top level>')
# Make sure we have a builtins import
builder.gen_import('builtins', -1)
# Generate ops.
for node in mypyfile.defs:
builder.accept(node)
builder.maybe_add_implicit_return()
# Generate special function representing module top level.
args, _, blocks, ret_type, _ = builder.leave()
sig = FuncSignature([], none_rprimitive)
func_ir = FuncIR(FuncDecl(TOP_LEVEL_NAME, None, builder.module_name, sig), args, blocks,
traceback_name="<module>")
builder.functions.append(func_ir)
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