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/*
* Copyright 2016 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Removes code from all functions but one, leaving a valid module with (mostly)
// just the code from that function, as best we can.
//
// This pass will run --remove-unused-module-elements automatically for you, in
// order to remove as many things as possible.
#include "pass.h"
#include "wasm.h"
namespace wasm {
struct ExtractFunction : public Pass {
void run(PassRunner* runner, Module* module) override {
Name name = runner->options.getArgument(
"extract-function",
"ExtractFunction usage: wasm-opt --extract-function=FUNCTION_NAME");
std::cerr << "extracting " << name << "\n";
bool found = false;
for (auto& func : module->functions) {
if (func->name != name) {
// Turn it into an import.
func->module = "env";
func->base = func->name;
func->vars.clear();
func->body = nullptr;
} else {
found = true;
}
}
if (!found) {
Fatal() << "could not find the function to extract\n";
}
// Leave just one export, for the thing we want.
module->exports.clear();
auto* export_ = new Export;
export_->name = name;
export_->value = name;
export_->kind = ExternalKind::Function;
module->addExport(export_);
// Remove unneeded things.
PassRunner postRunner(runner);
postRunner.add("remove-unused-module-elements");
postRunner.setIsNested(true);
postRunner.run();
}
};
// declare pass
Pass* createExtractFunctionPass() { return new ExtractFunction(); }
} // namespace wasm
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