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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.
*/
//
// Lowers switch cases out into blocks,
//
/*
(tableswitch $switch$0
(i32.sub
(get_local $x)
(i32.const 1)
)
(table (case $switch-case$1) (case $switch-case$2)) (case $switch-default$3)
(case $switch-case$1
(return
(i32.const 1)
)
)
(case $switch-case$2
(return
(i32.const 2)
)
)
(case $switch-default$3
(nop)
)
)
into
(block $forswitch$switch$0
(block $switch-case$3
(block $switch-case$2
(block $switch-case$1
(tableswitch $switch$0
(i32.sub
(get_local $x)
(i32.const 1)
)
(table (br $switch-case$1) (br $switch-case$2)) (br $switch-default$3)
)
)
(return
(i32.const 1)
)
)
(return
(i32.const 2)
)
)
(nop)
)
*/
#include <memory>
#include <wasm.h>
#include <pass.h>
namespace wasm {
struct LowerCase : public WalkerPass<WasmWalker<LowerCase, void>> {
MixedArena* allocator;
void prepare(PassRunner* runner, Module *module) override {
allocator = runner->allocator;
}
void visitSwitch(Switch *curr) {
if (curr->cases.size() == 0) return;
auto top = allocator->alloc<Block>();
top->list.push_back(curr);
for (auto& c : curr->cases) {
top->name = c.name;
auto next = allocator->alloc<Block>();
next->list.push_back(top);
next->list.push_back(c.body);
top = next;
}
curr->cases.clear();
top->name = curr->name;
curr->name = Name();
replaceCurrent(top);
}
};
static RegisterPass<LowerCase> registerPass("lower-case", "lowers cases into blocks");
} // namespace wasm
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