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/*
* Copyright 2021 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.
*/
// Assigns values to specified globals. This can be useful to perform a minor
// customization of an existing wasm file.
#include "pass.h"
#include "support/string.h"
#include "wasm-builder.h"
#include "wasm.h"
namespace wasm {
struct SetGlobals : public Pass {
// Only modifies globals.
bool requiresNonNullableLocalFixups() override { return false; }
void run(Module* module) override {
Name input =
getArgument("set-globals",
"SetGlobals usage: wasm-opt --pass-arg=set-globals@x=y,z=w");
// The input is a set of X=Y pairs separated by commas.
String::Split pairs(input.toString(), ",");
for (auto& pair : pairs) {
String::Split nameAndValue(pair, "=");
auto name = nameAndValue[0];
auto value = nameAndValue[1];
auto* glob = module->getGlobalOrNull(name);
if (!glob) {
Fatal() << "Could not find global: " << name;
}
// Parse the input.
Literal lit;
if (glob->type == Type::i32) {
lit = Literal(int32_t(stoi(value)));
} else if (glob->type == Type::i64) {
lit = Literal(int64_t(stoll(value)));
} else {
Fatal() << "global's type is not supported: " << name;
}
// The global now has a value, and is not imported.
glob->init = Builder(*module).makeConst(lit);
glob->module = glob->base = Name();
}
}
};
// declare pass
Pass* createSetGlobalsPass() { return new SetGlobals(); }
} // namespace wasm
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