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/*
* Copyright 2015 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.
*/
//
// Removeds imports, and replaces them with nops. This is useful
// for running a module through the reference interpreter, which
// does not validate imports for a JS environment (by removing
// imports, we can at least get the reference interpreter to
// look at all the rest of the code).
//
#include <wasm.h>
#include <pass.h>
namespace wasm {
struct RemoveImports : public WalkerPass<PostWalker<RemoveImports, Visitor<RemoveImports>>> {
MixedArena* allocator;
Module* module;
void prepare(PassRunner* runner, Module *module_) override {
allocator = runner->allocator;
module = module_;
}
void visitCallImport(CallImport *curr) {
WasmType type = module->getImport(curr->target)->type->result;
if (type == none) {
replaceCurrent(allocator->alloc<Nop>());
} else {
Literal nopLiteral;
nopLiteral.type = type;
replaceCurrent(allocator->alloc<Const>()->set(nopLiteral));
}
}
void visitModule(Module *curr) {
auto imports = curr->imports; // copy
for (auto* import : imports) {
curr->removeImport(import->name);
}
}
};
static RegisterPass<RemoveImports> registerPass("remove-imports", "removes imports and replaces them with nops");
} // namespace wasm
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