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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.
*/
//
// Assumes the program will never exit the runtime (as in the emscripten
// NO_EXIT_RUNTIME option). That means that atexit()s do not need to be
// run.
//
#include <pass.h>
#include <wasm.h>
#include <wasm-builder.h>
#include <asmjs/shared-constants.h>
using namespace std;
namespace wasm {
struct NoExitRuntime : public WalkerPass<PostWalker<NoExitRuntime>> {
bool isFunctionParallel() override { return true; }
Pass* create() override { return new NoExitRuntime; }
// Remove all possible manifestations of atexit, across asm2wasm and llvm wasm backend.
std::array<Name, 4> ATEXIT_NAMES = {{ "___cxa_atexit",
"__cxa_atexit",
"_atexit",
"atexit" }};
void visitCall(Call* curr) {
auto* import = getModule()->getFunctionOrNull(curr->target);
if (!import || !import->imported() || import->module != ENV) return;
for (auto name : ATEXIT_NAMES) {
if (name == import->base) {
replaceCurrent(
Builder(*getModule()).replaceWithIdenticalType(curr)
);
}
}
}
};
Pass* createNoExitRuntimePass() {
return new NoExitRuntime();
}
} // namespace wasm
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