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/*
* Copyright 2023 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.
*/
// A generic CFG / basic block utility. Unlike the utilities in src/cfg/, this
// is a generic representation of a CFG rather than a generic builder of
// CFG-like objects. It lives here in src/analysis/ because it is primarily
// meant for use in the static analysis framework. Other Binaryen code will find
// it more idiomatic to use the utilities in src/cfg/.
#ifndef wasm_analysis_cfg_h
#define wasm_analysis_cfg_h
#include <iostream>
#include <vector>
#include "wasm.h"
namespace wasm::analysis {
struct CFG;
struct BasicBlock {
using iterator = std::vector<Expression*>::const_iterator;
// Iterate through instructions.
iterator begin() const { return insts.cbegin(); }
iterator end() const { return insts.cend(); }
size_t size() const { return insts.size(); }
using reverse_iterator = std::vector<Expression*>::const_reverse_iterator;
reverse_iterator rbegin() const { return insts.rbegin(); }
reverse_iterator rend() const { return insts.rend(); }
const std::vector<const BasicBlock*>& preds() const { return predecessors; }
const std::vector<const BasicBlock*>& succs() const { return successors; }
void print(std::ostream& os, Module* wasm = nullptr, size_t start = 0) const;
Index getIndex() const { return index; }
bool isEntry() const { return entry; }
bool isExit() const { return exit; }
private:
Index index;
bool entry = false;
bool exit = false;
std::vector<Expression*> insts;
std::vector<const BasicBlock*> predecessors;
std::vector<const BasicBlock*> successors;
friend CFG;
};
struct CFG {
// Iterate through basic blocks.
using iterator = std::vector<BasicBlock>::const_iterator;
iterator begin() const { return blocks.cbegin(); }
iterator end() const { return blocks.cend(); }
size_t size() const { return blocks.size(); }
using reverse_iterator = std::vector<BasicBlock>::const_reverse_iterator;
reverse_iterator rbegin() const { return blocks.rbegin(); }
reverse_iterator rend() const { return blocks.rend(); }
const BasicBlock& operator[](size_t i) const { return *(begin() + i); }
static CFG fromFunction(Function* func);
void print(std::ostream& os, Module* wasm = nullptr) const;
private:
std::vector<BasicBlock> blocks;
friend BasicBlock;
};
// A helper class that computes block indexes for a CFG and allows querying of
// them.
struct CFGBlockIndexes {
CFGBlockIndexes(const CFG& cfg);
// Gets the index of the basic block in which the instruction resides.
Index get(Expression* expr) const {
auto iter = map.find(expr);
if (iter == map.end()) {
// There is no entry for this, which can be the case for control flow
// structures, or for unreachable code.
return InvalidBlock;
}
return iter->second;
}
enum { InvalidBlock = Index(-1) };
private:
std::unordered_map<Expression*, Index> map;
};
} // namespace wasm::analysis
#endif // wasm_analysis_cfg_h
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