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/*
* Copyright 2022 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.
*/
#include "ir/memory-utils.h"
#include "wasm.h"
namespace wasm::MemoryUtils {
bool flatten(Module& wasm) {
// The presence of any MemoryInit instructions is a problem because they care
// about segment identity, which flattening gets rid of ( when it merges them
// all into one big segment).
ModuleUtils::ParallelFunctionAnalysis<bool> analysis(
wasm, [&](Function* func, bool& hasMemoryInit) {
if (func->imported()) {
return;
}
hasMemoryInit = FindAll<MemoryInit>(func->body).list.size() > 0;
});
for (auto& [func, hasMemoryInit] : analysis.map) {
if (hasMemoryInit) {
return false;
}
}
auto& memory = wasm.memory;
if (memory.segments.size() == 0) {
return true;
}
std::vector<char> data;
for (auto& segment : memory.segments) {
if (segment.isPassive) {
return false;
}
auto* offset = segment.offset->dynCast<Const>();
if (!offset) {
return false;
}
}
for (auto& segment : memory.segments) {
auto* offset = segment.offset->dynCast<Const>();
Index start = offset->value.getInteger();
Index end = start + segment.data.size();
if (end > data.size()) {
data.resize(end);
}
std::copy(segment.data.begin(), segment.data.end(), data.begin() + start);
}
memory.segments.resize(1);
memory.segments[0].offset->cast<Const>()->value = Literal(int32_t(0));
memory.segments[0].data.swap(data);
return true;
}
} // namespace wasm::MemoryUtils
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