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#include <torch/csrc/jit/backends/backend_resolver.h>
#include <torch/csrc/jit/frontend/sugared_value.h>
#include <torch/custom_class.h>
namespace torch {
namespace jit {
namespace {
// Essentially ClassNamespaceValue from import_source.cpp without the
// SourceImporterImpl reference. This helps resolve the
// __torch__.torch.classes.backends.{backend_name} symbols in the generated code
// for the LoweredModule.
struct ClassNamespaceValue : public SugaredValue {
explicit ClassNamespaceValue(c10::QualifiedName name)
: basename_(std::move(name)) {}
std::shared_ptr<SugaredValue> attr(
const SourceRange& loc,
GraphFunction& m,
const std::string& name) override {
auto fullName = c10::QualifiedName(basename_, name);
// Check to see if it is a custom class.
if (auto custom_class = getCustomClass(fullName.qualifiedName())) {
return std::make_shared<ClassValue>(custom_class);
}
// If it's not a custom class, assume it's another namespace
return std::make_shared<ClassNamespaceValue>(std::move(fullName));
}
std::string kind() const override {
return "Class Namespace";
}
private:
c10::QualifiedName basename_;
};
// A resolver just for resolving custom backend class lookups in the
// LoweredModule classes generated by the rest of the cdoe in this file.
struct LoweredModuleResolver : 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");
} else if (name == "__torch__") {
return std::make_shared<ClassNamespaceValue>(c10::QualifiedName(name));
} else if (name == "Exception") {
return std::make_shared<ExceptionValue>(name);
}
return nullptr;
}
TypePtr resolveType(const std::string& name, const SourceRange& loc)
override {
return nullptr;
}
};
} // namespace
std::shared_ptr<Resolver> loweredModuleResolver() {
std::shared_ptr<Resolver> resolver =
std::make_shared<LoweredModuleResolver>();
return resolver;
}
} // namespace jit
} // namespace torch
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