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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 you want to debug (function-parallel,
// non-lto) passes on.
#include "wasm.h"
#include "pass.h"
namespace wasm {
struct ExtractFunction : public Pass {
void run(PassRunner* runner, Module* module) override {
auto* leave = getenv("BINARYEN_EXTRACT");
if (!leave) {
std::cerr << "usage: set BINARYEN_EXTRACT in the env\n";
abort();
}
Name LEAVE(leave);
std::cerr << "extracting " << LEAVE << "\n";
bool found = false;
for (auto& func : module->functions) {
if (func->name != LEAVE) {
// wipe out all the contents
func->vars.clear();
func->body = module->allocator.alloc<Unreachable>();
} else {
found = true;
}
}
if (!found) {
std::cerr << "could not find the function to extract\n";
abort();
}
// clear data
module->memory.segments.clear();
module->table.segments.clear();
// leave just an export for the thing we want
module->exports.clear();
auto* export_ = new Export;
export_->name = LEAVE;
export_->value = LEAVE;
export_->kind = ExternalKind::Function;
module->addExport(export_);
}
};
// declare pass
Pass *createExtractFunctionPass() {
return new ExtractFunction();
}
} // namespace wasm
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