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/*
* Copyright 2017 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.
*/
#ifndef wasm_ir_local_graph_h
#define wasm_ir_local_graph_h
namespace wasm {
//
// Finds the connections between local.gets and local.sets, creating
// a graph of those ties. This is useful for "ssa-style" optimization,
// in which you want to know exactly which sets are relevant for a
// a get, so it is as if each get has just one set, logically speaking
// (see the SSA pass for actually creating new local indexes based
// on this).
//
struct LocalGraph {
// main API
// the constructor computes getSetses, the sets affecting each get
LocalGraph(Function* func);
// the local.sets relevant for an index or a get.
typedef std::set<SetLocal*> Sets;
typedef std::map<GetLocal*, Sets> GetSetses;
typedef std::map<Expression*, Expression**> Locations;
// externally useful information
GetSetses getSetses; // the sets affecting each get. a nullptr set means the initial
// value (0 for a var, the received value for a param)
Locations locations; // where each get and set is (for easy replacing)
// optional computation: compute the influence graphs between sets and gets
// (useful for algorithms that propagate changes)
std::unordered_map<GetLocal*, std::unordered_set<SetLocal*>> getInfluences; // for each get, the sets whose values are influenced by that get
std::unordered_map<SetLocal*, std::unordered_set<GetLocal*>> setInfluences; // for each set, the gets whose values are influenced by that set
void computeInfluences();
};
} // namespace wasm
#endif // wasm_ir_local_graph_h
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