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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.
*/
//
// Merges blocks to their parents.
//
#include <wasm.h>
#include <pass.h>
namespace wasm {
struct MergeBlocks : public WalkerPass<PostWalker<MergeBlocks, Visitor<MergeBlocks>>> {
bool isFunctionParallel() { return true; }
void visitBlock(Block *curr) {
bool more = true;
while (more) {
more = false;
for (size_t i = 0; i < curr->list.size(); i++) {
Block* child = curr->list[i]->dynCast<Block>();
if (!child) continue;
if (child->name.is()) continue; // named blocks can have breaks to them (and certainly do, if we ran RemoveUnusedNames and RemoveUnusedBrs)
ExpressionList merged(getModule()->allocator);
for (size_t j = 0; j < i; j++) {
merged.push_back(curr->list[j]);
}
for (auto item : child->list) {
merged.push_back(item);
}
for (size_t j = i + 1; j < curr->list.size(); j++) {
merged.push_back(curr->list[j]);
}
curr->list = merged;
more = true;
break;
}
}
}
};
static RegisterPass<MergeBlocks> registerPass("merge-blocks", "merges blocks to their parents");
} // namespace wasm
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