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#include "Halide.h"
#include <map>
#include <sstream>
#include <string>
#include <vector>
using namespace Halide::Internal;
namespace Halide {
namespace {
// Note to reader: this test is meant as a simple way to verify that arbitrary
// implementations of AbstractGenerator work properly. That said, we recommend
// that you don't imitate this code; AbstractGenerator is an *internal*
// abtraction, intended for Halide to build on internally. If you use AbstractGenerator
// directly, you'll almost certainly have more work maintaining your code
// on your own.
const char *const AbstractGeneratorTestName = "abstractgeneratortest";
// We could use std::stoi() here, but we explicitly want to assert-fail
// if we can't parse the string as a valid int.
int string_to_int(const std::string &s) {
std::istringstream iss(s);
int i;
iss >> i;
_halide_user_assert(!iss.fail() && iss.get() == EOF) << "Unable to parse: " << s;
return i;
}
class AbstractGeneratorTest : public AbstractGenerator {
// Boilerplate
const GeneratorContext context_;
// Constants (aka GeneratorParams)
GeneratorParamsMap constants_ = {
{"scaling", "2"},
};
// Inputs
ImageParam input_{Int(32), 2, "input"};
Param<int32_t> offset_{"offset"};
// Outputs
Func output_{"output"};
// Misc
Pipeline pipeline_;
public:
explicit AbstractGeneratorTest(const GeneratorContext &context)
: context_(context) {
}
std::string name() override {
return AbstractGeneratorTestName;
}
GeneratorContext context() const override {
return context_;
}
std::vector<ArgInfo> arginfos() override {
return {
{"input", ArgInfoDirection::Input, ArgInfoKind::Buffer, {Int(32)}, 2},
{"offset", ArgInfoDirection::Input, ArgInfoKind::Scalar, {Int(32)}, 0},
{"output", ArgInfoDirection::Output, ArgInfoKind::Buffer, {Int(32)}, 2},
};
}
bool allow_out_of_order_inputs_and_outputs() const override {
return false;
}
void set_generatorparam_value(const std::string &name, const std::string &value) override {
_halide_user_assert(!pipeline_.defined());
_halide_user_assert(constants_.count(name) == 1) << "Unknown Constant: " << name;
constants_[name] = value;
}
void set_generatorparam_value(const std::string &name, const LoopLevel &value) override {
_halide_user_assert(!pipeline_.defined());
_halide_user_assert(constants_.count(name) == 1) << "Unknown Constant: " << name;
_halide_user_assert(false) << "This Generator has no LoopLevel constants.";
}
Pipeline build_pipeline() override {
_halide_user_assert(!pipeline_.defined());
const int scaling = string_to_int(constants_.at("scaling"));
Var x, y;
output_(x, y) = input_(x, y) * scaling + offset_;
output_.compute_root();
pipeline_ = output_;
return pipeline_;
}
std::vector<Parameter> input_parameter(const std::string &name) override {
_halide_user_assert(pipeline_.defined());
if (name == "input") {
return {input_.parameter()};
}
if (name == "offset") {
return {offset_.parameter()};
}
_halide_user_assert(false) << "Unknown input: " << name;
return {};
}
std::vector<Func> output_func(const std::string &name) override {
_halide_user_assert(pipeline_.defined());
if (name == "output") {
return {output_};
}
_halide_user_assert(false) << "Unknown output: " << name;
return {};
}
void bind_input(const std::string &name, const std::vector<Parameter> &v) override {
_halide_user_assert(false) << "OOPS";
}
void bind_input(const std::string &name, const std::vector<Func> &v) override {
_halide_user_assert(false) << "OOPS";
}
void bind_input(const std::string &name, const std::vector<Expr> &v) override {
_halide_user_assert(false) << "OOPS";
}
bool emit_cpp_stub(const std::string & /*stub_file_path*/) override {
// not supported
return false;
}
bool emit_hlpipe(const std::string & /*hlpipe_file_path*/) override {
// not supported
return false;
}
};
RegisterGenerator register_something(AbstractGeneratorTestName,
[](const GeneratorContext &context) -> AbstractGeneratorPtr {
return std::unique_ptr<AbstractGeneratorTest>(new AbstractGeneratorTest(context));
});
} // namespace
} // namespace Halide
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