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