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305 lines
9.8 KiB
Python
305 lines
9.8 KiB
Python
"""Support annotations for C API elements.
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* Reference count annotations for C API functions.
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* Stable ABI annotations
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* Limited API annotations
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Configuration:
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* Set ``refcount_file`` to the path to the reference count data file.
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* Set ``stable_abi_file`` to the path to stable ABI list.
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"""
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from __future__ import annotations
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import csv
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import dataclasses
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from pathlib import Path
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from typing import TYPE_CHECKING
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import sphinx
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from docutils import nodes
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from docutils.statemachine import StringList
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from sphinx import addnodes
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from sphinx.locale import _ as sphinx_gettext
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from sphinx.util.docutils import SphinxDirective
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if TYPE_CHECKING:
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from sphinx.application import Sphinx
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from sphinx.util.typing import ExtensionMetadata
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ROLE_TO_OBJECT_TYPE = {
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"func": "function",
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"macro": "macro",
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"member": "member",
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"type": "type",
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"data": "var",
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}
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@dataclasses.dataclass(slots=True)
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class RefCountEntry:
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# Name of the function.
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name: str
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# List of (argument name, type, refcount effect) tuples.
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# (Currently not used. If it was, a dataclass might work better.)
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args: list = dataclasses.field(default_factory=list)
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# Return type of the function.
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result_type: str = ""
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# Reference count effect for the return value.
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result_refs: int | None = None
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@dataclasses.dataclass(frozen=True, slots=True)
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class StableABIEntry:
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# Role of the object.
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# Source: Each [item_kind] in stable_abi.toml is mapped to a C Domain role.
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role: str
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# Name of the object.
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# Source: [<item_kind>.*] in stable_abi.toml.
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name: str
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# Version when the object was added to the stable ABI.
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# (Source: [<item_kind>.*.added] in stable_abi.toml.
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added: str
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# An explananatory blurb for the ifdef.
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# Source: ``feature_macro.*.doc`` in stable_abi.toml.
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ifdef_note: str
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# Defines how much of the struct is exposed. Only relevant for structs.
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# Source: [<item_kind>.*.struct_abi_kind] in stable_abi.toml.
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struct_abi_kind: str
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def read_refcount_data(refcount_filename: Path) -> dict[str, RefCountEntry]:
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refcount_data = {}
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refcounts = refcount_filename.read_text(encoding="utf8")
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for line in refcounts.splitlines():
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line = line.strip()
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if not line or line.startswith("#"):
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# blank lines and comments
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continue
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# Each line is of the form
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# function ':' type ':' [param name] ':' [refcount effect] ':' [comment]
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parts = line.split(":", 4)
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if len(parts) != 5:
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raise ValueError(f"Wrong field count in {line!r}")
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function, type, arg, refcount, _comment = parts
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# Get the entry, creating it if needed:
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try:
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entry = refcount_data[function]
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except KeyError:
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entry = refcount_data[function] = RefCountEntry(function)
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if not refcount or refcount == "null":
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refcount = None
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else:
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refcount = int(refcount)
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# Update the entry with the new parameter
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# or the result information.
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if arg:
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entry.args.append((arg, type, refcount))
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else:
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entry.result_type = type
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entry.result_refs = refcount
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return refcount_data
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def read_stable_abi_data(stable_abi_file: Path) -> dict[str, StableABIEntry]:
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stable_abi_data = {}
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with open(stable_abi_file, encoding="utf8") as fp:
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for record in csv.DictReader(fp):
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name = record["name"]
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stable_abi_data[name] = StableABIEntry(**record)
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return stable_abi_data
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def add_annotations(app: Sphinx, doctree: nodes.document) -> None:
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state = app.env.domaindata["c_annotations"]
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refcount_data = state["refcount_data"]
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stable_abi_data = state["stable_abi_data"]
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for node in doctree.findall(addnodes.desc_content):
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par = node.parent
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if par["domain"] != "c":
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continue
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if not par[0].get("ids", None):
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continue
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name = par[0]["ids"][0]
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if name.startswith("c."):
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name = name[2:]
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objtype = par["objtype"]
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# Stable ABI annotation.
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if record := stable_abi_data.get(name):
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if ROLE_TO_OBJECT_TYPE[record.role] != objtype:
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msg = (
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f"Object type mismatch in limited API annotation for {name}: "
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f"{ROLE_TO_OBJECT_TYPE[record.role]!r} != {objtype!r}"
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)
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raise ValueError(msg)
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annotation = _stable_abi_annotation(record)
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node.insert(0, annotation)
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# Unstable API annotation.
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if name.startswith("PyUnstable"):
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annotation = _unstable_api_annotation()
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node.insert(0, annotation)
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# Return value annotation
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if objtype != "function":
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continue
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if name not in refcount_data:
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continue
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entry = refcount_data[name]
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if not entry.result_type.endswith("Object*"):
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continue
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annotation = _return_value_annotation(entry.result_refs)
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node.insert(0, annotation)
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def _stable_abi_annotation(record: StableABIEntry) -> nodes.emphasis:
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"""Create the Stable ABI annotation.
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These have two forms:
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Part of the `Stable ABI <link>`_.
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Part of the `Stable ABI <link>`_ since version X.Y.
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For structs, there's some more info in the message:
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Part of the `Limited API <link>`_ (as an opaque struct).
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Part of the `Stable ABI <link>`_ (including all members).
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Part of the `Limited API <link>`_ (Only some members are part
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of the stable ABI.).
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... all of which can have "since version X.Y" appended.
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"""
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stable_added = record.added
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message = sphinx_gettext("Part of the")
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message = message.center(len(message) + 2)
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emph_node = nodes.emphasis(message, message, classes=["stableabi"])
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ref_node = addnodes.pending_xref(
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"Stable ABI",
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refdomain="std",
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reftarget="stable",
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reftype="ref",
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refexplicit="False",
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)
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struct_abi_kind = record.struct_abi_kind
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if struct_abi_kind in {"opaque", "members"}:
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ref_node += nodes.Text(sphinx_gettext("Limited API"))
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else:
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ref_node += nodes.Text(sphinx_gettext("Stable ABI"))
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emph_node += ref_node
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if struct_abi_kind == "opaque":
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emph_node += nodes.Text(" " + sphinx_gettext("(as an opaque struct)"))
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elif struct_abi_kind == "full-abi":
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emph_node += nodes.Text(
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" " + sphinx_gettext("(including all members)")
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)
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if record.ifdef_note:
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emph_node += nodes.Text(f" {record.ifdef_note}")
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if stable_added == "3.2":
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# Stable ABI was introduced in 3.2.
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pass
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else:
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emph_node += nodes.Text(
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" " + sphinx_gettext("since version %s") % stable_added
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)
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emph_node += nodes.Text(".")
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if struct_abi_kind == "members":
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msg = " " + sphinx_gettext(
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"(Only some members are part of the stable ABI.)"
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)
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emph_node += nodes.Text(msg)
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return emph_node
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def _unstable_api_annotation() -> nodes.admonition:
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ref_node = addnodes.pending_xref(
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"Unstable API",
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nodes.Text(sphinx_gettext("Unstable API")),
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refdomain="std",
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reftarget="unstable-c-api",
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reftype="ref",
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refexplicit="False",
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)
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emph_node = nodes.emphasis(
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"This is ",
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sphinx_gettext("This is") + " ",
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ref_node,
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nodes.Text(
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sphinx_gettext(
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". It may change without warning in minor releases."
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)
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),
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)
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return nodes.admonition(
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"",
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emph_node,
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classes=["unstable-c-api", "warning"],
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)
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def _return_value_annotation(result_refs: int | None) -> nodes.emphasis:
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classes = ["refcount"]
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if result_refs is None:
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rc = sphinx_gettext("Return value: Always NULL.")
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classes.append("return_null")
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elif result_refs:
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rc = sphinx_gettext("Return value: New reference.")
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classes.append("return_new_ref")
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else:
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rc = sphinx_gettext("Return value: Borrowed reference.")
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classes.append("return_borrowed_ref")
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return nodes.emphasis(rc, rc, classes=classes)
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class LimitedAPIList(SphinxDirective):
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has_content = False
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required_arguments = 0
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optional_arguments = 0
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final_argument_whitespace = True
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def run(self) -> list[nodes.Node]:
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state = self.env.domaindata["c_annotations"]
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content = [
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f"* :c:{record.role}:`{record.name}`"
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for record in state["stable_abi_data"].values()
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]
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node = nodes.paragraph()
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self.state.nested_parse(StringList(content), 0, node)
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return [node]
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def init_annotations(app: Sphinx) -> None:
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# Using domaindata is a bit hack-ish,
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# but allows storing state without a global variable or closure.
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app.env.domaindata["c_annotations"] = state = {}
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state["refcount_data"] = read_refcount_data(
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Path(app.srcdir, app.config.refcount_file)
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)
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state["stable_abi_data"] = read_stable_abi_data(
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Path(app.srcdir, app.config.stable_abi_file)
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)
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def setup(app: Sphinx) -> ExtensionMetadata:
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app.add_config_value("refcount_file", "", "env", types={str})
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app.add_config_value("stable_abi_file", "", "env", types={str})
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app.add_directive("limited-api-list", LimitedAPIList)
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app.connect("builder-inited", init_annotations)
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app.connect("doctree-read", add_annotations)
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if sphinx.version_info[:2] < (7, 2):
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from docutils.parsers.rst import directives
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from sphinx.domains.c import CObject
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# monkey-patch C object...
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CObject.option_spec |= {
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"no-index-entry": directives.flag,
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"no-contents-entry": directives.flag,
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}
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return {
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"version": "1.0",
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"parallel_read_safe": True,
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"parallel_write_safe": True,
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}
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