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docs/functional: Add dummy toy example

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Add `dummy.cc`, loosely based on `backends/functional/test_generic.cc` but as an actualy backend and without the memory testing.
Skeleton section for minimal functional backend, describing the aforementioned `dummy.cc`.
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Krystine Sherwin 2025-02-27 16:14:59 +13:00
parent db823a6acb
commit 560b5fe6bd
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docs/source/code_examples/functional/dummy.cc Normal file
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#include "kernel/functional.h"
#include "kernel/yosys.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct FunctionalDummyBackend : public Backend {
FunctionalDummyBackend() : Backend("functional_dummy", "dump generated Functional IR") {}
void execute(std::ostream *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design) override
{
// backend pass boiler plate
log_header(design, "Executing dummy functional backend.\n");
size_t argidx = 1;
extra_args(f, filename, args, argidx, design);
for (auto module : design->selected_modules())
{
log("Processing module `%s`.\n", module->name.c_str());
// convert module to FunctionalIR
auto ir = Functional::IR::from_module(module);
*f << "module " << module->name.c_str() << "\n";
// write node functions
for (auto node : ir)
*f << " assign " << id2cstr(node.name())
<< " = " << node.to_string() << "\n";
*f << "\n";
// write outputs and next state
for (auto output : ir.outputs())
*f << " " << id2cstr(output->kind)
<< " " << id2cstr(output->name)
<< " = " << id2cstr(output->value().name()) << "\n";
for (auto state : ir.states())
*f << " " << id2cstr(state->kind)
<< " " << id2cstr(state->name)
<< " = " << id2cstr(state->next_value().name()) << "\n";
}
}
} FunctionalDummyBackend;
PRIVATE_NAMESPACE_END