a7f8b7cd8e
The raw `OpView` classes are used to bypass the constructors of `OpView` subclasses, but having a separate class can create some confusing behaviour, e.g.: ``` op = MyOp(...) # fails, lhs is 'MyOp', rhs is '_MyOp' assert type(op) == type(op.operation.opview) ``` Instead we can use `__new__` to achieve the same thing without a separate class: ``` my_op = MyOp.__new__(MyOp) OpView.__init__(my_op, op) ``` Reviewed By: stellaraccident Differential Revision: https://reviews.llvm.org/D143830
118 lines
4.5 KiB
C++
118 lines
4.5 KiB
C++
//===- Globals.h - MLIR Python extension globals --------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef MLIR_BINDINGS_PYTHON_GLOBALS_H
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#define MLIR_BINDINGS_PYTHON_GLOBALS_H
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#include <string>
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#include <vector>
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#include <optional>
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#include "PybindUtils.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/StringSet.h"
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namespace mlir {
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namespace python {
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/// Globals that are always accessible once the extension has been initialized.
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class PyGlobals {
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public:
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PyGlobals();
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~PyGlobals();
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/// Most code should get the globals via this static accessor.
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static PyGlobals &get() {
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assert(instance && "PyGlobals is null");
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return *instance;
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}
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/// Get and set the list of parent modules to search for dialect
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/// implementation classes.
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std::vector<std::string> &getDialectSearchPrefixes() {
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return dialectSearchPrefixes;
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}
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void setDialectSearchPrefixes(std::vector<std::string> newValues) {
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dialectSearchPrefixes.swap(newValues);
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}
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/// Clears positive and negative caches regarding what implementations are
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/// available. Future lookups will do more expensive existence checks.
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void clearImportCache();
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/// Loads a python module corresponding to the given dialect namespace.
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/// No-ops if the module has already been loaded or is not found. Raises
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/// an error on any evaluation issues.
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/// Note that this returns void because it is expected that the module
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/// contains calls to decorators and helpers that register the salient
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/// entities.
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void loadDialectModule(llvm::StringRef dialectNamespace);
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/// Decorator for registering a custom Dialect class. The class object must
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/// have a DIALECT_NAMESPACE attribute.
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pybind11::object registerDialectDecorator(pybind11::object pyClass);
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/// Adds a user-friendly Attribute builder.
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/// Raises an exception if the mapping already exists.
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/// This is intended to be called by implementation code.
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void registerAttributeBuilder(const std::string &attributeKind,
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pybind11::function pyFunc);
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/// Adds a concrete implementation dialect class.
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/// Raises an exception if the mapping already exists.
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/// This is intended to be called by implementation code.
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void registerDialectImpl(const std::string &dialectNamespace,
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pybind11::object pyClass);
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/// Adds a concrete implementation operation class.
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/// Raises an exception if the mapping already exists.
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/// This is intended to be called by implementation code.
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void registerOperationImpl(const std::string &operationName,
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pybind11::object pyClass);
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/// Returns the custom Attribute builder for Attribute kind.
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std::optional<pybind11::function>
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lookupAttributeBuilder(const std::string &attributeKind);
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/// Looks up a registered dialect class by namespace. Note that this may
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/// trigger loading of the defining module and can arbitrarily re-enter.
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std::optional<pybind11::object>
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lookupDialectClass(const std::string &dialectNamespace);
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/// Looks up a registered operation class (deriving from OpView) by operation
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/// name. Note that this may trigger a load of the dialect, which can
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/// arbitrarily re-enter.
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std::optional<pybind11::object>
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lookupOperationClass(llvm::StringRef operationName);
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private:
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static PyGlobals *instance;
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/// Module name prefixes to search under for dialect implementation modules.
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std::vector<std::string> dialectSearchPrefixes;
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/// Map of dialect namespace to external dialect class object.
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llvm::StringMap<pybind11::object> dialectClassMap;
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/// Map of full operation name to external operation class object.
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llvm::StringMap<pybind11::object> operationClassMap;
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/// Map of attribute ODS name to custom builder.
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llvm::StringMap<pybind11::object> attributeBuilderMap;
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/// Set of dialect namespaces that we have attempted to import implementation
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/// modules for.
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llvm::StringSet<> loadedDialectModulesCache;
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/// Cache of operation name to external operation class object. This is
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/// maintained on lookup as a shadow of operationClassMap in order for repeat
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/// lookups of the classes to only incur the cost of one hashtable lookup.
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llvm::StringMap<pybind11::object> operationClassMapCache;
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};
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} // namespace python
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} // namespace mlir
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#endif // MLIR_BINDINGS_PYTHON_GLOBALS_H
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