使用C++实现RDA冗余分析分析

RDA（冗余分析）是一种用于寻找程序中的冗余计算的技术。下面是一个使用C++实现RDA分析的示例代码：

#include <iostream>
#include <vector>
#include <unordered_map>

using namespace std;

struct Instruction {
    string operation;
    string operand1;
    string operand2;
    string result;
};

vector<Instruction> instructions;
unordered_map<string, vector<int>> def;
unordered_map<string, vector<int>> use;
unordered_map<string, vector<int>> in;
unordered_map<string, vector<int>> out;

void addDef(string variable, int line) {
    def[variable].push_back(line);
}

void addUse(string variable, int line) {
    use[variable].push_back(line);
}

void calculateIn(int line) {
    for (auto& entry : use) {
        string variable = entry.first;
        vector<int>& useLines = entry.second;
        for (int useLine : useLines) {
            if (useLine == line) {
                continue;
            }
            if (in[variable].empty() || find(in[variable].begin(), in[variable].end(), useLine) == in[variable].end()) {
                in[variable].push_back(useLine);
            }
        }
    }
}

void calculateOut(int line) {
    for (auto& entry : def) {
        string variable = entry.first;
        vector<int>& defLines = entry.second;
        for (int defLine : defLines) {
            if (defLine == line) {
                continue;
            }
            if (out[variable].empty() || find(out[variable].begin(), out[variable].end(), defLine) == out[variable].end()) {
                out[variable].push_back(defLine);
            }
        }
    }
}

void printRDA() {
    cout << "Def:" << endl;
    for (auto& entry : def) {
        string variable = entry.first;
        vector<int>& defLines = entry.second;
        cout << variable << ": ";
        for (int defLine : defLines) {
            cout << defLine << " ";
        }
        cout << endl;
    }
    
    cout << "Use:" << endl;
    for (auto& entry : use) {
        string variable = entry.first;
        vector<int>& useLines = entry.second;
        cout << variable << ": ";
        for (int useLine : useLines) {
            cout << useLine << " ";
        }
        cout << endl;
    }
    
    cout << "In:" << endl;
    for (auto& entry : in) {
        string variable = entry.first;
        vector<int>& inLines = entry.second;
        cout << variable << ": ";
        for (int inLine : inLines) {
            cout << inLine << " ";
        }
        cout << endl;
    }
    
    cout << "Out:" << endl;
    for (auto& entry : out) {
        string variable = entry.first;
        vector<int>& outLines = entry.second;
        cout << variable << ": ";
        for (int outLine : outLines) {
            cout << outLine << " ";
        }
        cout << endl;
    }
}

int main() {
    // 读取指令
    int numInstructions;
    cout << "Enter the number of instructions: ";
    cin >> numInstructions;
    
    for (int i = 0; i < numInstructions; i++) {
        Instruction instruction;
        cout << "Enter instruction " << i + 1 << ": ";
        cin >> instruction.operation >> instruction.operand1 >> instruction.operand2 >> instruction.result;
        instructions.push_back(instruction);
        
        addDef(instruction.result, i + 1);
        addUse(instruction.operand1, i + 1);
        addUse(instruction.operand2, i + 1);
    }
    
    // 计算RDA
    for (int i = numInstructions - 1; i >= 0; i--) {
        calculateIn(i + 1);
        calculateOut(i + 1);
    }
    
    // 输出RDA结果
    printRDA();
    
    return 0;
}

该示例代码实现了一个简单的RDA分析，通过输入指令并构建相关的数据结构，计算出每个变量的Def、Use、In和Out集合，并将结果打印出来。在输入指令时，每个指令的操作符、操作数和结果都需要提供。