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#pragma once
#include <ATen/core/jit_type.h>
#include <ATen/core/qualified_name.h>
#include <torch/csrc/jit/frontend/sugared_value.h>
namespace torch {
namespace jit {
struct Resolver;
using ResolverPtr = std::shared_ptr<Resolver>;
/**
* class Resolver
*
* Represents an "outer environment" in which we an look up names and return
* a corresponding SugaredValue. This is used during compilation to resolve
* references to names which are not defined internal to the graph.
*
* Example: PythonResolver looks at the enclosing Python scope for `name`.
*
* NOTE: When adding methods, keep this an abstract class (i.e. all new methods
* should be purely virtual). Resist the urge to provide a default
* implementation; you should explicitly think about how each resolver would
* handle the method.
*/
struct Resolver {
virtual ~Resolver() = default;
// Resolve a given name to a SugaredValue. This takes the method `m` that the
// caller is currently constructing, since we may need to insert nodes into
// the graph to create a value.
virtual std::shared_ptr<SugaredValue> resolveValue(
const std::string& name,
GraphFunction& m,
const SourceRange& loc) {
return nullptr;
}
// Resolve `name` to a TypePtr.
virtual TypePtr resolveType(const std::string& name, const SourceRange& loc) {
return nullptr;
}
};
// A resolver that only understands "torch.foo()" lookups.
struct NativeResolver : public Resolver {
std::shared_ptr<SugaredValue> resolveValue(
const std::string& name,
GraphFunction& m,
const SourceRange& loc) override {
if (name == "torch") {
return std::make_shared<BuiltinModule>("aten");
}
return nullptr;
}
TypePtr resolveType(const std::string& name, const SourceRange& loc)
override {
return nullptr;
}
};
inline std::shared_ptr<NativeResolver> nativeResolver() {
return std::make_shared<NativeResolver>();
}
} // namespace jit
} // namespace torch
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