2053 lines
81 KiB
C++
2053 lines
81 KiB
C++
// SysYIRGenerator.cpp
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// TODO：类型转换及其检查
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// TODO：sysy库函数处理
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// TODO：数组处理
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// TODO：对while、continue、break的测试
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#include "IR.h"
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#include <any>
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#include <memory>
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#include <iterator>
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#include <sstream>
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#include <string>
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#include <vector>
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#include "SysYIRGenerator.h"
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using namespace std;
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namespace sysy {
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// std::vector<Value*> BinaryValueStack; ///< 用于存储value的栈
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// std::vector<int> BinaryOpStack; ///< 用于存储二元表达式的操作符栈
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// // 约定操作符：
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// // 1: 'ADD', 2: 'SUB', 3: 'MUL', 4: 'DIV', 5: '%', 6: 'PLUS', 7: 'NEG', 8: 'NOT'
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// enum BinaryOp {
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// ADD = 1,
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// SUB = 2,
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// MUL = 3,
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// DIV = 4,
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// MOD = 5,
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// PLUS = 6,
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// NEG = 7,
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// NOT = 8
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// };
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Value *SysYIRGenerator::promoteType(Value *value, Type *targetType) {
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//如果是常量则直接返回相应的值
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if (targetType == nullptr) {
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return value; // 如果值为空，那就不需要转换
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}
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ConstantInteger* constInt = dynamic_cast<ConstantInteger *>(value);
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ConstantFloating *constFloat = dynamic_cast<ConstantFloating *>(value);
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if (constInt) {
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if (targetType->isFloat()) {
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return ConstantFloating::get(static_cast<float>(constInt->getInt()));
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}
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return constInt; // 如果目标类型是int，直接返回原值
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} else if (constFloat) {
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if (targetType->isInt()) {
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return ConstantInteger::get(static_cast<int>(constFloat->getFloat()));
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}
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return constFloat; // 如果目标类型是float，直接返回原值
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}
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if (value->getType()->isInt() && targetType->isFloat()) {
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return builder.createItoFInst(value);
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} else if (value->getType()->isFloat() && targetType->isInt()) {
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return builder.createFtoIInst(value);
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}
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// 如果类型已经匹配，直接返回原值
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return value;
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}
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bool SysYIRGenerator::isRightAssociative(int op) {
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return (op == BinaryOp::PLUS || op == BinaryOp::NEG || op == BinaryOp::NOT);
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}
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void SysYIRGenerator::compute() {
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// 先将中缀表达式转换为后缀表达式
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BinaryRPNStack.clear();
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BinaryOpStack.clear();
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int begin = BinaryExpStack.size() - BinaryExpLenStack.back(), end = BinaryExpStack.size();
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for (int i = begin; i < end; i++) {
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auto item = BinaryExpStack[i];
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if (std::holds_alternative<sysy::Value *>(item)) {
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// 如果是操作数 (Value*)，直接推入后缀表达式栈
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BinaryRPNStack.push_back(item); // 直接 push_back item (ValueOrOperator类型)
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} else {
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// 如果是操作符
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int currentOp = std::get<int>(item);
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if (currentOp == LPAREN) {
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// 左括号直接入栈
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BinaryOpStack.push_back(currentOp);
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} else if (currentOp == RPAREN) {
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// 右括号：将操作符栈中的操作符弹出并添加到后缀表达式栈，直到遇到左括号
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while (!BinaryOpStack.empty() && BinaryOpStack.back() != LPAREN) {
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BinaryRPNStack.push_back(BinaryOpStack.back()); // 直接 push_back int
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BinaryOpStack.pop_back();
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}
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if (!BinaryOpStack.empty() && BinaryOpStack.back() == LPAREN) {
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BinaryOpStack.pop_back(); // 弹出左括号，但不添加到后缀表达式栈
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} else {
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// 错误：不匹配的右括号
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std::cerr << "Error: Mismatched parentheses in expression." << std::endl;
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return;
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}
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} else {
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// 普通操作符
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while (!BinaryOpStack.empty() && BinaryOpStack.back() != LPAREN) {
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int stackTopOp = BinaryOpStack.back();
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// 如果当前操作符优先级低于栈顶操作符优先级
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// 或者 (当前操作符优先级等于栈顶操作符优先级 并且 栈顶操作符是左结合)
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if (getOperatorPrecedence(currentOp) < getOperatorPrecedence(stackTopOp) ||
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(getOperatorPrecedence(currentOp) == getOperatorPrecedence(stackTopOp) &&
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!isRightAssociative(stackTopOp))) {
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BinaryRPNStack.push_back(stackTopOp);
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BinaryOpStack.pop_back();
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} else {
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break; // 否则当前操作符入栈
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}
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}
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BinaryOpStack.push_back(currentOp); // 当前操作符入栈
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}
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}
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}
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// 遍历结束后，将操作符栈中剩余的所有操作符弹出并添加到后缀表达式栈
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while (!BinaryOpStack.empty()) {
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if (BinaryOpStack.back() == LPAREN) {
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// 错误：不匹配的左括号
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std::cerr << "Error: Mismatched parentheses in expression (unclosed parenthesis)." << std::endl;
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return;
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}
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BinaryRPNStack.push_back(BinaryOpStack.back()); // 直接 push_back int
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BinaryOpStack.pop_back();
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}
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// 弹出BinaryExpStack的表达式
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while(begin < end) {
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BinaryExpStack.pop_back();
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BinaryExpLenStack.back()--;
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end--;
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}
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// 计算后缀表达式
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// 每次计算前清空操作数栈
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BinaryValueStack.clear();
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// 遍历后缀表达式栈
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Type *commonType = nullptr;
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for(const auto &item : BinaryRPNStack) {
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if (std::holds_alternative<Value *>(item)) {
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// 如果是操作数 (Value*) 检测他的类型
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Value *value = std::get<Value *>(item);
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if (commonType == nullptr) {
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commonType = value->getType();
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}
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else if (value->getType() != commonType && value->getType()->isFloat()) {
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// 如果当前值的类型与commonType不同且是float类型，则提升为float
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commonType = Type::getFloatType();
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break;
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}
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} else {
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continue;
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}
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}
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for (const auto &item : BinaryRPNStack) {
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if (std::holds_alternative<sysy::Value *>(item)) {
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// 如果是操作数 (Value*)，直接推入操作数栈
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BinaryValueStack.push_back(std::get<sysy::Value *>(item));
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} else {
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// 如果是操作符
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int op = std::get<int>(item);
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Value *resultValue = nullptr;
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Value *lhs = nullptr;
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Value *rhs = nullptr;
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Value *operand = nullptr;
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switch (op) {
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case BinaryOp::ADD:
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case BinaryOp::SUB:
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case BinaryOp::MUL:
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case BinaryOp::DIV:
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case BinaryOp::MOD: {
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// 二元操作符需要两个操作数
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if (BinaryValueStack.size() < 2) {
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std::cerr << "Error: Not enough operands for binary operation: " << op << std::endl;
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return; // 或者抛出异常
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}
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rhs = BinaryValueStack.back();
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BinaryValueStack.pop_back();
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lhs = BinaryValueStack.back();
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BinaryValueStack.pop_back();
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// 类型转换
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lhs = promoteType(lhs, commonType);
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rhs = promoteType(rhs, commonType);
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// 尝试常量折叠
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ConstantValue *lhsConst = dynamic_cast<ConstantValue *>(lhs);
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ConstantValue *rhsConst = dynamic_cast<ConstantValue *>(rhs);
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if (lhsConst && rhsConst) {
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// 如果都是常量，直接计算结果
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if (commonType == Type::getIntType()) {
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int lhsVal = lhsConst->getInt();
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int rhsVal = rhsConst->getInt();
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switch (op) {
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case BinaryOp::ADD: resultValue = ConstantInteger::get(lhsVal + rhsVal); break;
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case BinaryOp::SUB: resultValue = ConstantInteger::get(lhsVal - rhsVal); break;
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case BinaryOp::MUL: resultValue = ConstantInteger::get(lhsVal * rhsVal); break;
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case BinaryOp::DIV:
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if (rhsVal == 0) {
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std::cerr << "Error: Division by zero." << std::endl;
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return;
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}
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resultValue = sysy::ConstantInteger::get(lhsVal / rhsVal); break;
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case BinaryOp::MOD:
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if (rhsVal == 0) {
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std::cerr << "Error: Modulo by zero." << std::endl;
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return;
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}
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resultValue = sysy::ConstantInteger::get(lhsVal % rhsVal); break;
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default:
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std::cerr << "Error: Unknown binary operator for constants: " << op << std::endl;
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return;
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}
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} else if (commonType == Type::getFloatType()) {
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float lhsVal = lhsConst->getFloat();
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float rhsVal = rhsConst->getFloat();
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switch (op) {
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case BinaryOp::ADD: resultValue = ConstantFloating::get(lhsVal + rhsVal); break;
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case BinaryOp::SUB: resultValue = ConstantFloating::get(lhsVal - rhsVal); break;
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case BinaryOp::MUL: resultValue = ConstantFloating::get(lhsVal * rhsVal); break;
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case BinaryOp::DIV:
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if (rhsVal == 0.0f) {
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std::cerr << "Error: Division by zero." << std::endl;
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return;
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}
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resultValue = sysy::ConstantFloating::get(lhsVal / rhsVal); break;
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case BinaryOp::MOD:
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std::cerr << "Error: Modulo operator not supported for float types." << std::endl;
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return;
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default:
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std::cerr << "Error: Unknown binary operator for float constants: " << op << std::endl;
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return;
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}
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} else {
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std::cerr << "Error: Unsupported type for binary constant operation." << std::endl;
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return;
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}
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} else {
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// 否则，创建相应的IR指令
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if (commonType == Type::getIntType()) {
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switch (op) {
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case BinaryOp::ADD: resultValue = builder.createAddInst(lhs, rhs); break;
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case BinaryOp::SUB: resultValue = builder.createSubInst(lhs, rhs); break;
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case BinaryOp::MUL: resultValue = builder.createMulInst(lhs, rhs); break;
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case BinaryOp::DIV: resultValue = builder.createDivInst(lhs, rhs); break;
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case BinaryOp::MOD: resultValue = builder.createRemInst(lhs, rhs); break;
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}
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} else if (commonType == Type::getFloatType()) {
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switch (op) {
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case BinaryOp::ADD: resultValue = builder.createFAddInst(lhs, rhs); break;
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case BinaryOp::SUB: resultValue = builder.createFSubInst(lhs, rhs); break;
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case BinaryOp::MUL: resultValue = builder.createFMulInst(lhs, rhs); break;
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case BinaryOp::DIV: resultValue = builder.createFDivInst(lhs, rhs); break;
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case BinaryOp::MOD:
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std::cerr << "Error: Modulo operator not supported for float types." << std::endl;
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return;
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}
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} else {
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std::cerr << "Error: Unsupported type for binary instruction." << std::endl;
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return;
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}
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}
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break;
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}
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case BinaryOp::PLUS:
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case BinaryOp::NEG:
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case BinaryOp::NOT: {
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// 一元操作符需要一个操作数
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if (BinaryValueStack.empty()) {
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std::cerr << "Error: Not enough operands for unary operation: " << op << std::endl;
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return;
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}
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operand = BinaryValueStack.back();
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BinaryValueStack.pop_back();
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operand = promoteType(operand, commonType);
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// 尝试常量折叠
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ConstantInteger *constInt = dynamic_cast<ConstantInteger *>(operand);
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ConstantFloating *constFloat = dynamic_cast<ConstantFloating *>(operand);
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if (constInt || constFloat) {
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// 如果是常量，直接计算结果
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switch (op) {
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case BinaryOp::PLUS: resultValue = operand; break;
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case BinaryOp::NEG: {
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if (constInt) {
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resultValue = constInt->getNeg();
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} else if (constFloat) {
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resultValue = constFloat->getNeg();
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} else {
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std::cerr << "Error: Negation not supported for constant operand type." << std::endl;
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return;
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}
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break;
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}
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case BinaryOp::NOT:
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if (constInt) {
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resultValue = sysy::ConstantInteger::get(constInt->getInt() == 0 ? 1 : 0);
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} else if (constFloat) {
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resultValue = sysy::ConstantInteger::get(constFloat->getFloat() == 0.0f ? 1 : 0);
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} else {
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std::cerr << "Error: Logical NOT not supported for constant operand type." << std::endl;
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return;
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}
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break;
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default:
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std::cerr << "Error: Unknown unary operator for constants: " << op << std::endl;
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return;
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}
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} else {
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// 否则，创建相应的IR指令
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switch (op) {
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case BinaryOp::PLUS:
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resultValue = operand; // 一元加指令通常直接返回操作数
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break;
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case BinaryOp::NEG: {
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if (commonType == sysy::Type::getIntType()) {
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resultValue = builder.createNegInst(operand);
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} else if (commonType == sysy::Type::getFloatType()) {
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resultValue = builder.createFNegInst(operand);
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} else {
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std::cerr << "Error: Negation not supported for operand type." << std::endl;
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return;
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}
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break;
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}
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case BinaryOp::NOT:
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// 逻辑非
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if (commonType == sysy::Type::getIntType()) {
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resultValue = builder.createNotInst(operand);
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} else if (commonType == sysy::Type::getFloatType()) {
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resultValue = builder.createFNotInst(operand);
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} else {
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std::cerr << "Error: Logical NOT not supported for operand type." << std::endl;
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return;
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}
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break;
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default:
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std::cerr << "Error: Unknown unary operator for instructions: " << op << std::endl;
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return;
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}
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}
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break;
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}
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default:
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std::cerr << "Error: Unknown operator " << op << " encountered in RPN stack." << std::endl;
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return;
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}
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// 将计算结果或指令结果推入操作数栈
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if (resultValue) {
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BinaryValueStack.push_back(resultValue);
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} else {
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std::cerr << "Error: Result value is null after processing operator " << op << "!" << std::endl;
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return;
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}
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}
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}
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// 后缀表达式处理完毕，操作数栈的栈顶就是最终结果
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if (BinaryValueStack.empty()) {
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std::cerr << "Error: No values left in BinaryValueStack after processing RPN." << std::endl;
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return;
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}
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if (BinaryValueStack.size() > 1) {
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std::cerr
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<< "Warning: Multiple values left in BinaryValueStack after processing RPN. Expression might be malformed."
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<< std::endl;
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}
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BinaryRPNStack.clear(); // 清空后缀表达式栈
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BinaryOpStack.clear(); // 清空操作符栈
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return;
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}
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Value* SysYIRGenerator::computeExp(SysYParser::ExpContext *ctx, Type* targetType){
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if (ctx->addExp() == nullptr) {
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assert(false && "ExpContext should have an addExp child!");
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}
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BinaryExpLenStack.push_back(0); // 进入新的层次时Push 0
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visitAddExp(ctx->addExp());
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// if(targetType == nullptr) {
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// targetType = Type::getIntType(); // 默认目标类型为int
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// }
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compute();
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// 最后一个Value应该是最终结果
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Value* result = BinaryValueStack.back();
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BinaryValueStack.pop_back(); // 移除结果值
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result = promoteType(result, targetType); // 确保结果类型符合目标类型
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// 检查当前层次的操作符数量
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int ExpLen = BinaryExpLenStack.back();
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BinaryExpLenStack.pop_back(); // 离开层次时将该层次
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if (ExpLen > 0) {
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std::cerr << "Warning: There are still " << ExpLen << " binary val or op left unprocessed in this level!" << std::endl;
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return nullptr;
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}
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return result;
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}
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Value* SysYIRGenerator::computeAddExp(SysYParser::AddExpContext *ctx, Type* targetType){
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// 根据AddExpContext中的操作符和操作数计算加法表达式
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// 这里假设AddExpContext已经被正确填充
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if (ctx->mulExp().size() == 0) {
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assert(false && "AddExpContext should have a mulExp child!");
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}
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BinaryExpLenStack.push_back(0); // 进入新的层次时Push 0
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visitMulExp(ctx->mulExp(0));
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// BinaryValueStack.push_back(result);
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for (int i = 1; i < ctx->mulExp().size(); i++) {
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auto opNode = dynamic_cast<antlr4::tree::TerminalNode*>(ctx->children[2*i-1]);
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int opType = opNode->getSymbol()->getType();
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switch(opType) {
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case SysYParser::ADD: BinaryExpStack.push_back(BinaryOp::ADD); BinaryExpLenStack.back()++; break;
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case SysYParser::SUB: BinaryExpStack.push_back(BinaryOp::SUB); BinaryExpLenStack.back()++; break;
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default: assert(false && "Unexpected operator in AddExp.");
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}
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// BinaryExpStack.push_back(opType);
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visitMulExp(ctx->mulExp(i));
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// BinaryValueStack.push_back(operand);
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}
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||
// if(targetType == nullptr) {
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// targetType = Type::getIntType(); // 默认目标类型为int
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// }
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||
// 根据后缀表达式的逻辑计算
|
||
compute();
|
||
// 最后一个Value应该是最终结果
|
||
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||
Value* result = BinaryValueStack.back();
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||
BinaryValueStack.pop_back(); // 移除最后一个值，因为它已经被计算
|
||
result = promoteType(result, targetType); // 确保结果类型符合目标类型
|
||
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||
int ExpLen = BinaryExpLenStack.back();
|
||
BinaryExpLenStack.pop_back(); // 离开层次时将该层次
|
||
if (ExpLen > 0) {
|
||
std::cerr << "Warning: There are still " << ExpLen << " binary val or op left unprocessed in this level!" << std::endl;
|
||
return nullptr;
|
||
}
|
||
return result;
|
||
}
|
||
|
||
Type* SysYIRGenerator::buildArrayType(Type* baseType, const std::vector<Value*>& dims){
|
||
Type* currentType = baseType;
|
||
// 从最内层维度开始构建 ArrayType
|
||
// 例如对于 int arr[2][3]，先处理 [3]，再处理 [2]
|
||
// 注意：SysY 的 dims 是从最外层到最内层，所以我们需要反向迭代
|
||
// 或者调整逻辑，使得从内到外构建 ArrayType
|
||
// 假设 dims 列表是 [dim1, dim2, dim3...] (例如 [2, 3] for int[2][3])
|
||
// 我们需要从最内层维度开始向外构建 ArrayType
|
||
for (int i = dims.size() - 1; i >= 0; --i) {
|
||
// 维度大小必须是常量，否则无法构建 ArrayType
|
||
ConstantInteger* constDim = dynamic_cast<ConstantInteger*>(dims[i]);
|
||
if (constDim == nullptr) {
|
||
// 如果维度不是常量，可能需要特殊处理，例如将其视为指针
|
||
// 对于函数参数 int arr[] 这种，第一个维度可以为未知
|
||
// 在这里，我们假设所有声明的数组维度都是常量
|
||
assert(false && "Array dimension must be a constant integer!");
|
||
return nullptr;
|
||
}
|
||
unsigned dimSize = constDim->getInt();
|
||
currentType = Type::getArrayType(currentType, dimSize);
|
||
}
|
||
return currentType;
|
||
}
|
||
|
||
// @brief: 获取 GEP 指令的地址
|
||
// @param basePointer: GEP 的基指针，已经过适当的加载/处理，类型为 LLVM IR 中的指针类型。
|
||
// 例如，对于局部数组，它是 AllocaInst；对于参数数组，它是 LoadInst 的结果。
|
||
// @param indices: 已经包含了所有必要的偏移索引 (包括可能的初始 0 索引，由 visitLValue 准备)。
|
||
// @return: 计算得到的地址值 (也是一个指针类型)
|
||
Value* SysYIRGenerator::getGEPAddressInst(Value* basePointer, const std::vector<Value*>& indices) {
|
||
// 检查 basePointer 是否为指针类型
|
||
assert(basePointer->getType()->isPointer() && "Base pointer must be a pointer type!");
|
||
|
||
// `indices` 向量现在由调用方（如 visitLValue, visitVarDecl, visitAssignStmt）负责完整准备，
|
||
// 包括是否需要添加初始的 `0` 索引。
|
||
// 所以这里直接将其传递给 `builder.createGetElementPtrInst`。
|
||
return builder.createGetElementPtrInst(basePointer, indices);
|
||
}
|
||
|
||
/*
|
||
* @brief: visit compUnit
|
||
* @details:
|
||
* compUnit: (globalDecl | funcDef)+;
|
||
*/
|
||
std::any SysYIRGenerator::visitCompUnit(SysYParser::CompUnitContext *ctx) {
|
||
// create the IR module
|
||
auto pModule = new Module();
|
||
assert(pModule);
|
||
module.reset(pModule);
|
||
|
||
// SymbolTable::ModuleScope scope(symbols_table);
|
||
|
||
Utils::initExternalFunction(pModule, &builder);
|
||
|
||
pModule->enterNewScope();
|
||
visitChildren(ctx);
|
||
pModule->leaveScope();
|
||
return pModule;
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitGlobalConstDecl(SysYParser::GlobalConstDeclContext *ctx){
|
||
auto constDecl = ctx->constDecl();
|
||
Type* type = std::any_cast<Type *>(visitBType(constDecl->bType()));
|
||
for (const auto &constDef : constDecl->constDef()) {
|
||
std::vector<Value *> dims = {};
|
||
std::string name = constDef->Ident()->getText();
|
||
auto constExps = constDef->constExp();
|
||
if (!constExps.empty()) {
|
||
for (const auto &constExp : constExps) {
|
||
dims.push_back(std::any_cast<Value *>(visitConstExp(constExp)));
|
||
}
|
||
}
|
||
|
||
ArrayValueTree* root = std::any_cast<ArrayValueTree *>(constDef->constInitVal()->accept(this));
|
||
ValueCounter values;
|
||
Utils::tree2Array(type, root, dims, dims.size(), values, &builder);
|
||
delete root;
|
||
// 创建全局常量变量，并更新符号表
|
||
Type* variableType = type;
|
||
if (!dims.empty()) { // 如果有维度，说明是数组
|
||
variableType = buildArrayType(type, dims); // 构建完整的 ArrayType
|
||
}
|
||
module->createConstVar(name, Type::getPointerType(variableType), values);
|
||
}
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitGlobalVarDecl(SysYParser::GlobalVarDeclContext *ctx) {
|
||
auto varDecl = ctx->varDecl();
|
||
Type* type = std::any_cast<Type *>(visitBType(varDecl->bType()));
|
||
for (const auto &varDef : varDecl->varDef()) {
|
||
std::vector<Value *> dims = {};
|
||
std::string name = varDef->Ident()->getText();
|
||
auto constExps = varDef->constExp();
|
||
if (!constExps.empty()) {
|
||
for (const auto &constExp : constExps) {
|
||
dims.push_back(std::any_cast<Value *>(visitConstExp(constExp)));
|
||
}
|
||
}
|
||
|
||
ValueCounter values = {};
|
||
if (varDef->initVal() != nullptr) {
|
||
ArrayValueTree* root = std::any_cast<ArrayValueTree *>(varDef->initVal()->accept(this));
|
||
Utils::tree2Array(type, root, dims, dims.size(), values, &builder);
|
||
delete root;
|
||
}
|
||
// 创建全局变量，并更新符号表
|
||
Type* variableType = type;
|
||
if (!dims.empty()) { // 如果有维度，说明是数组
|
||
variableType = buildArrayType(type, dims); // 构建完整的 ArrayType
|
||
}
|
||
module->createGlobalValue(name, Type::getPointerType(variableType), values);
|
||
}
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitConstDecl(SysYParser::ConstDeclContext *ctx) {
|
||
Type *type = std::any_cast<Type *>(visitBType(ctx->bType()));
|
||
for (const auto constDef : ctx->constDef()) {
|
||
std::vector<Value *> dims = {};
|
||
std::string name = constDef->Ident()->getText();
|
||
auto constExps = constDef->constExp();
|
||
if (!constExps.empty()) {
|
||
for (const auto constExp : constExps) {
|
||
dims.push_back(std::any_cast<Value *>(visitConstExp(constExp)));
|
||
}
|
||
}
|
||
|
||
Type *variableType = type;
|
||
if (!dims.empty()) {
|
||
variableType = buildArrayType(type, dims); // 构建完整的 ArrayType
|
||
}
|
||
|
||
// 显式地为局部常量在栈上分配空间
|
||
// alloca 的类型将是指针指向常量类型，例如 `int*` 或 `int[2][3]*`
|
||
AllocaInst *alloca = builder.createAllocaInst(Type::getPointerType(variableType), name);
|
||
|
||
ArrayValueTree *root = std::any_cast<ArrayValueTree *>(constDef->constInitVal()->accept(this));
|
||
ValueCounter values;
|
||
Utils::tree2Array(type, root, dims, dims.size(), values, &builder);
|
||
delete root;
|
||
|
||
// 根据维度信息进行 store 初始化
|
||
if (dims.empty()) { // 标量常量初始化
|
||
// 局部常量必须有初始值，且通常是单个值
|
||
if (!values.getValues().empty()) {
|
||
builder.createStoreInst(values.getValue(0), alloca);
|
||
} else {
|
||
// 错误处理：局部标量常量缺少初始化值
|
||
// 或者可以考虑默认初始化为0，但这通常不符合常量的语义
|
||
assert(false && "Local scalar constant must have an initialization value!");
|
||
return std::any(); // 直接返回，避免继续执行
|
||
}
|
||
} else { // 数组常量初始化
|
||
const std::vector<sysy::Value *> &counterValues = values.getValues();
|
||
const std::vector<unsigned> &counterNumbers = values.getNumbers();
|
||
int numElements = 1;
|
||
std::vector<int> dimSizes;
|
||
for (Value *dimVal : dims) {
|
||
if (ConstantInteger *constInt = dynamic_cast<ConstantInteger *>(dimVal)) {
|
||
int dimSize = constInt->getInt();
|
||
numElements *= dimSize;
|
||
dimSizes.push_back(dimSize);
|
||
}
|
||
// TODO else 错误处理：数组维度必须是常量（对于静态分配）
|
||
else {
|
||
assert(false && "Array dimension must be a constant integer!");
|
||
return std::any(); // 直接返回，避免继续执行
|
||
}
|
||
}
|
||
unsigned int elementSizeInBytes = type->getSize();
|
||
unsigned int totalSizeInBytes = numElements * elementSizeInBytes;
|
||
|
||
// 检查是否所有初始化值都是零
|
||
bool allValuesAreZero = false;
|
||
if (counterValues.empty()) { // 如果没有提供初始化值，通常视为全零初始化
|
||
allValuesAreZero = true;
|
||
} else {
|
||
allValuesAreZero = true;
|
||
for (Value *val : counterValues) {
|
||
if (ConstantInteger *constInt = dynamic_cast<ConstantInteger *>(val)) {
|
||
if (constInt->getInt() != 0) {
|
||
allValuesAreZero = false;
|
||
break;
|
||
}
|
||
} else { // 如果不是常量整数，则不能确定是零
|
||
allValuesAreZero = false;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (allValuesAreZero) {
|
||
builder.createMemsetInst(alloca, ConstantInteger::get(0), ConstantInteger::get(totalSizeInBytes),
|
||
ConstantInteger::get(0));
|
||
} else {
|
||
int linearIndexOffset = 0; // 用于追踪当前处理的线性索引的偏移量
|
||
for (int k = 0; k < counterValues.size(); ++k) {
|
||
// 当前 Value 的值和重复次数
|
||
Value *currentValue = counterValues[k];
|
||
unsigned currentRepeatNum = counterNumbers[k];
|
||
|
||
for (unsigned i = 0; i < currentRepeatNum; ++i) {
|
||
std::vector<Value *> currentIndices;
|
||
int tempLinearIndex = linearIndexOffset + i; // 使用偏移量和当前重复次数内的索引
|
||
|
||
// 将线性索引转换为多维索引
|
||
for (int dimIdx = dimSizes.size() - 1; dimIdx >= 0; --dimIdx) {
|
||
currentIndices.insert(currentIndices.begin(),
|
||
ConstantInteger::get(static_cast<int>(tempLinearIndex % dimSizes[dimIdx])));
|
||
tempLinearIndex /= dimSizes[dimIdx];
|
||
}
|
||
|
||
// 对于局部数组，alloca 本身就是 GEP 的基指针。
|
||
// GEP 的第一个索引必须是 0，用于“步过”整个数组。
|
||
std::vector<Value *> gepIndicesForInit;
|
||
gepIndicesForInit.push_back(ConstantInteger::get(0));
|
||
gepIndicesForInit.insert(gepIndicesForInit.end(), currentIndices.begin(), currentIndices.end());
|
||
|
||
// 计算元素的地址
|
||
Value *elementAddress = getGEPAddressInst(alloca, gepIndicesForInit);
|
||
// 生成 store 指令
|
||
builder.createStoreInst(currentValue, elementAddress);
|
||
}
|
||
// 更新线性索引偏移量，以便下一次迭代从正确的位置开始
|
||
linearIndexOffset += currentRepeatNum;
|
||
}
|
||
}
|
||
}
|
||
|
||
// 更新符号表，将常量名称与 AllocaInst 关联起来
|
||
module->addVariable(name, alloca);
|
||
}
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitVarDecl(SysYParser::VarDeclContext *ctx) {
|
||
Type* type = std::any_cast<Type *>(visitBType(ctx->bType()));
|
||
for (const auto varDef : ctx->varDef()) {
|
||
std::vector<Value *> dims = {};
|
||
std::string name = varDef->Ident()->getText();
|
||
auto constExps = varDef->constExp();
|
||
if (!constExps.empty()) {
|
||
for (const auto &constExp : constExps) {
|
||
dims.push_back(std::any_cast<Value *>(visitConstExp(constExp)));
|
||
}
|
||
}
|
||
|
||
Type* variableType = type;
|
||
if (!dims.empty()) { // 如果有维度，说明是数组
|
||
variableType = buildArrayType(type, dims); // 构建完整的 ArrayType
|
||
}
|
||
|
||
// 对于数组，alloca 的类型将是指针指向数组类型，例如 `int[2][3]*`
|
||
// 对于标量，alloca 的类型将是指针指向标量类型，例如 `int*`
|
||
AllocaInst* alloca =
|
||
builder.createAllocaInst(Type::getPointerType(variableType), name);
|
||
|
||
if (varDef->initVal() != nullptr) {
|
||
ValueCounter values;
|
||
ArrayValueTree* root = std::any_cast<ArrayValueTree *>(varDef->initVal()->accept(this));
|
||
Utils::tree2Array(type, root, dims, dims.size(), values, &builder);
|
||
delete root;
|
||
|
||
if (dims.empty()) { // 标量变量初始化
|
||
builder.createStoreInst(values.getValue(0), alloca);
|
||
} else { // 数组变量初始化
|
||
const std::vector<sysy::Value *> &counterValues = values.getValues();
|
||
const std::vector<unsigned> &counterNumbers = values.getNumbers();
|
||
int numElements = 1;
|
||
std::vector<int> dimSizes;
|
||
for (Value *dimVal : dims) {
|
||
if (ConstantInteger *constInt = dynamic_cast<ConstantInteger *>(dimVal)) {
|
||
int dimSize = constInt->getInt();
|
||
numElements *= dimSize;
|
||
dimSizes.push_back(dimSize);
|
||
}
|
||
// TODO else 错误处理：数组维度必须是常量（对于静态分配）
|
||
}
|
||
unsigned int elementSizeInBytes = type->getSize();
|
||
unsigned int totalSizeInBytes = numElements * elementSizeInBytes;
|
||
|
||
bool allValuesAreZero = false;
|
||
if (counterValues.empty()) {
|
||
allValuesAreZero = true;
|
||
}
|
||
else {
|
||
allValuesAreZero = true;
|
||
for (Value *val : counterValues){
|
||
if (ConstantInteger *constInt = dynamic_cast<ConstantInteger *>(val)){
|
||
if (constInt->getInt() != 0){
|
||
allValuesAreZero = false;
|
||
break;
|
||
}
|
||
}
|
||
else{
|
||
allValuesAreZero = false;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (allValuesAreZero) {
|
||
builder.createMemsetInst(
|
||
alloca,
|
||
ConstantInteger::get(0),
|
||
ConstantInteger::get(totalSizeInBytes),
|
||
ConstantInteger::get(0));
|
||
}
|
||
else {
|
||
|
||
int linearIndexOffset = 0; // 用于追踪当前处理的线性索引的偏移量
|
||
for (int k = 0; k < counterValues.size(); ++k) {
|
||
// 当前 Value 的值和重复次数
|
||
Value* currentValue = counterValues[k];
|
||
unsigned currentRepeatNum = counterNumbers[k];
|
||
|
||
for (unsigned i = 0; i < currentRepeatNum; ++i) {
|
||
std::vector<Value *> currentIndices;
|
||
int tempLinearIndex = linearIndexOffset + i; // 使用偏移量和当前重复次数内的索引
|
||
|
||
// 将线性索引转换为多维索引
|
||
for (int dimIdx = dimSizes.size() - 1; dimIdx >= 0; --dimIdx) {
|
||
currentIndices.insert(currentIndices.begin(),
|
||
ConstantInteger::get(static_cast<int>(tempLinearIndex % dimSizes[dimIdx])));
|
||
tempLinearIndex /= dimSizes[dimIdx];
|
||
}
|
||
|
||
// 对于局部数组，alloca 本身就是 GEP 的基指针。
|
||
// GEP 的第一个索引必须是 0，用于“步过”整个数组。
|
||
std::vector<Value*> gepIndicesForInit;
|
||
gepIndicesForInit.push_back(ConstantInteger::get(0));
|
||
gepIndicesForInit.insert(gepIndicesForInit.end(), currentIndices.begin(), currentIndices.end());
|
||
|
||
// 计算元素的地址
|
||
Value* elementAddress = getGEPAddressInst(alloca, gepIndicesForInit);
|
||
// 生成 store 指令
|
||
builder.createStoreInst(currentValue, elementAddress);
|
||
}
|
||
// 更新线性索引偏移量，以便下一次迭代从正确的位置开始
|
||
linearIndexOffset += currentRepeatNum;
|
||
}
|
||
|
||
}
|
||
}
|
||
}
|
||
else { // 如果没有显式初始化值，默认对数组进行零初始化
|
||
if (!dims.empty()) { // 只有数组才需要默认的零初始化
|
||
int numElements = 1;
|
||
for (Value *dimVal : dims) {
|
||
if (ConstantInteger *constInt = dynamic_cast<ConstantInteger *>(dimVal)) {
|
||
numElements *= constInt->getInt();
|
||
}
|
||
}
|
||
unsigned int elementSizeInBytes = type->getSize();
|
||
unsigned int totalSizeInBytes = numElements * elementSizeInBytes;
|
||
|
||
builder.createMemsetInst(
|
||
alloca,
|
||
ConstantInteger::get(0),
|
||
ConstantInteger::get(totalSizeInBytes),
|
||
ConstantInteger::get(0)
|
||
);
|
||
}
|
||
}
|
||
|
||
module->addVariable(name, alloca);
|
||
}
|
||
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitBType(SysYParser::BTypeContext *ctx) {
|
||
return ctx->INT() != nullptr ? Type::getIntType() : Type::getFloatType();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitScalarInitValue(SysYParser::ScalarInitValueContext *ctx) {
|
||
// Value* value = std::any_cast<Value *>(visitExp(ctx->exp()));
|
||
Value* value = computeExp(ctx->exp());
|
||
ArrayValueTree* result = new ArrayValueTree();
|
||
result->setValue(value);
|
||
return result;
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitArrayInitValue(SysYParser::ArrayInitValueContext *ctx) {
|
||
std::vector<ArrayValueTree *> children;
|
||
for (const auto &initVal : ctx->initVal())
|
||
children.push_back(std::any_cast<ArrayValueTree *>(initVal->accept(this)));
|
||
ArrayValueTree* result = new ArrayValueTree();
|
||
result->addChildren(children);
|
||
return result;
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitConstScalarInitValue(SysYParser::ConstScalarInitValueContext *ctx) {
|
||
Value* value = std::any_cast<Value *>(visitConstExp(ctx->constExp()));
|
||
ArrayValueTree* result = new ArrayValueTree();
|
||
result->setValue(value);
|
||
return result;
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitConstExp(SysYParser::ConstExpContext *ctx){
|
||
return computeAddExp(ctx->addExp());
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitConstArrayInitValue(SysYParser::ConstArrayInitValueContext *ctx) {
|
||
std::vector<ArrayValueTree *> children;
|
||
for (const auto &constInitVal : ctx->constInitVal())
|
||
children.push_back(std::any_cast<ArrayValueTree *>(constInitVal->accept(this)));
|
||
ArrayValueTree* result = new ArrayValueTree();
|
||
result->addChildren(children);
|
||
return result;
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitFuncType(SysYParser::FuncTypeContext *ctx) {
|
||
if (ctx->INT() != nullptr)
|
||
return Type::getIntType();
|
||
if (ctx->FLOAT() != nullptr)
|
||
return Type::getFloatType();
|
||
return Type::getVoidType();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitFuncDef(SysYParser::FuncDefContext *ctx){
|
||
// 更新作用域
|
||
module->enterNewScope();
|
||
|
||
auto name = ctx->Ident()->getText();
|
||
std::vector<Type *> paramActualTypes;
|
||
std::vector<std::string> paramNames;
|
||
std::vector<std::vector<Value *>> paramDims;
|
||
|
||
if (ctx->funcFParams() != nullptr) {
|
||
auto params = ctx->funcFParams()->funcFParam();
|
||
for (const auto ¶m : params) {
|
||
Type* baseBType = std::any_cast<Type *>(visitBType(param->bType()));
|
||
std::string paramName = param->Ident()->getText();
|
||
|
||
// 用于收集当前参数的维度信息（如果它是数组）
|
||
std::vector<Value *> currentParamDims;
|
||
if (!param->LBRACK().empty()) { // 如果参数声明中有方括号，说明是数组
|
||
// SysY 数组参数的第一个维度可以是未知的（例如 int arr[] 或 int arr[][10]）
|
||
// 这里的 ConstantInteger::get(-1) 表示未知维度，但对于 LLVM 类型构建，我们主要关注已知维度
|
||
currentParamDims.push_back(ConstantInteger::get(-1)); // 标记第一个维度为未知
|
||
for (const auto &exp : param->exp()) {
|
||
// 访问表达式以获取维度大小，这些维度必须是常量
|
||
Value* dimVal = std::any_cast<Value *>(visitExp(exp));
|
||
// 确保维度是常量整数，否则 buildArrayType 会断言失败
|
||
assert(dynamic_cast<ConstantInteger*>(dimVal) && "Array dimension in parameter must be a constant integer!");
|
||
currentParamDims.push_back(dimVal);
|
||
}
|
||
}
|
||
|
||
// 根据解析出的信息，确定参数在 LLVM IR 中的实际类型
|
||
Type* actualParamType;
|
||
if (currentParamDims.empty()) { // 情况1：标量参数 (e.g., int x)
|
||
actualParamType = baseBType; // 实际类型就是基本类型
|
||
} else { // 情况2&3：数组参数 (e.g., int arr[] 或 int arr[][10])
|
||
// 数组参数在函数传递时会退化为指针。
|
||
// 这个指针指向的类型是除第一维外，由后续维度构成的数组类型。
|
||
|
||
// 从 currentParamDims 中移除第一个标记未知维度的 -1
|
||
std::vector<Value*> fixedDimsForTypeBuilding;
|
||
if (currentParamDims.size() > 1) { // 如果有固定维度 (e.g., int arr[][10])
|
||
// 复制除第一个 -1 之外的所有维度
|
||
fixedDimsForTypeBuilding.assign(currentParamDims.begin() + 1, currentParamDims.end());
|
||
}
|
||
|
||
Type* pointedToArrayType = baseBType; // 从基本类型开始构建
|
||
// 从最内层维度向外层构建数组类型
|
||
// buildArrayType 期望 dims 是从最外层到最内层，但它内部反向迭代，所以这里直接传入
|
||
// 例如，对于 int arr[][10]，fixedDimsForTypeBuilding 包含 [10]，构建出 [10 x i32]
|
||
if (!fixedDimsForTypeBuilding.empty()) {
|
||
pointedToArrayType = buildArrayType(baseBType, fixedDimsForTypeBuilding);
|
||
}
|
||
|
||
// 实际参数类型是指向这个构建好的数组类型的指针
|
||
actualParamType = Type::getPointerType(pointedToArrayType); // e.g., i32* 或 [10 x i32]*
|
||
}
|
||
|
||
paramActualTypes.push_back(actualParamType); // 存储参数的实际 LLVM IR 类型
|
||
paramNames.push_back(paramName); // 存储参数名称
|
||
|
||
}
|
||
}
|
||
|
||
Type* returnType = std::any_cast<Type *>(visitFuncType(ctx->funcType()));
|
||
Type* funcType = Type::getFunctionType(returnType, paramActualTypes);
|
||
Function* function = module->createFunction(name, funcType);
|
||
BasicBlock* entry = function->getEntryBlock();
|
||
builder.setPosition(entry, entry->end());
|
||
|
||
for(int i = 0; i < paramActualTypes.size(); ++i) {
|
||
Argument* arg = new Argument(paramActualTypes[i], function, i, paramNames[i]);
|
||
function->insertArgument(arg);
|
||
|
||
}
|
||
|
||
auto funcArgs = function->getArguments();
|
||
std::vector<AllocaInst *> allocas;
|
||
for (int i = 0; i < paramActualTypes.size(); ++i) {
|
||
AllocaInst *alloca = builder.createAllocaInst(Type::getPointerType(paramActualTypes[i]), paramNames[i]);
|
||
allocas.push_back(alloca);
|
||
module->addVariable(paramNames[i], alloca);
|
||
}
|
||
|
||
for(int i = 0; i < paramActualTypes.size(); ++i) {
|
||
Value *argValue = funcArgs[i];
|
||
builder.createStoreInst(argValue, allocas[i]);
|
||
}
|
||
|
||
// 在处理函数体之前，创建一个新的基本块作为函数体的实际入口
|
||
// 这样 entryBB 就可以在完成初始化后跳转到这里
|
||
BasicBlock* funcBodyEntry = function->addBasicBlock("funcBodyEntry_" + name);
|
||
|
||
// 从 entryBB 无条件跳转到 funcBodyEntry
|
||
builder.createUncondBrInst(funcBodyEntry);
|
||
builder.setPosition(funcBodyEntry,funcBodyEntry->end()); // 将插入点设置到 funcBodyEntry
|
||
|
||
for (auto item : ctx->blockStmt()->blockItem()) {
|
||
visitBlockItem(item);
|
||
}
|
||
|
||
// 如果函数没有显式的返回语句，且返回类型不是 void，则需要添加一个默认的返回值
|
||
ReturnInst* retinst = nullptr;
|
||
retinst = dynamic_cast<ReturnInst*>(builder.getBasicBlock()->terminator()->get());
|
||
|
||
if (!retinst) {
|
||
if (returnType->isVoid()) {
|
||
builder.createReturnInst();
|
||
} else if (returnType->isInt()) {
|
||
builder.createReturnInst(ConstantInteger::get(0)); // 默认返回 0
|
||
} else if (returnType->isFloat()) {
|
||
builder.createReturnInst(ConstantFloating::get(0.0f)); // 默认返回 0.0f
|
||
} else {
|
||
assert(false && "Function with no explicit return and non-void type should return a value.");
|
||
}
|
||
}
|
||
|
||
module->leaveScope();
|
||
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitBlockStmt(SysYParser::BlockStmtContext *ctx) {
|
||
module->enterNewScope();
|
||
for (auto item : ctx->blockItem())
|
||
visitBlockItem(item);
|
||
module->leaveScope();
|
||
return 0;
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitAssignStmt(SysYParser::AssignStmtContext *ctx) {
|
||
auto lVal = ctx->lValue();
|
||
std::string name = lVal->Ident()->getText();
|
||
Value* LValue = nullptr;
|
||
Value* variable = module->getVariable(name); // 左值
|
||
|
||
vector<Value *> indices;
|
||
if (lVal->exp().size() > 0) {
|
||
// 如果有下标，访问表达式获取下标值
|
||
for (auto &exp : lVal->exp()) {
|
||
Value* indexValue = std::any_cast<Value *>(computeExp(exp));
|
||
indices.push_back(indexValue);
|
||
}
|
||
}
|
||
if (indices.empty()) {
|
||
// variable 本身就是指向标量的指针 (e.g., int* %a)
|
||
if (dynamic_cast<AllocaInst*>(variable) || dynamic_cast<GlobalValue*>(variable)) {
|
||
LValue = variable;
|
||
}
|
||
}
|
||
else {
|
||
// 对于数组或多维数组的左值处理
|
||
// 需要获取 GEP 地址
|
||
Value* gepBasePointer = nullptr;
|
||
std::vector<Value*> gepIndices;
|
||
if (AllocaInst *alloc = dynamic_cast<AllocaInst *>(variable)) {
|
||
Type* allocatedType = alloc->getType()->as<PointerType>()->getBaseType();
|
||
if (allocatedType->isPointer()) {
|
||
gepBasePointer = builder.createLoadInst(alloc);
|
||
gepIndices = indices;
|
||
} else {
|
||
gepBasePointer = alloc;
|
||
gepIndices.push_back(ConstantInteger::get(0));
|
||
gepIndices.insert(gepIndices.end(), indices.begin(), indices.end());
|
||
}
|
||
} else if (GlobalValue *glob = dynamic_cast<GlobalValue *>(variable)) {
|
||
// 情况 B: 全局变量 (GlobalValue)
|
||
gepBasePointer = glob;
|
||
gepIndices.push_back(ConstantInteger::get(0));
|
||
gepIndices.insert(gepIndices.end(), indices.begin(), indices.end());
|
||
} else if (ConstantVariable *constV = dynamic_cast<ConstantVariable *>(variable)) {
|
||
gepBasePointer = constV;
|
||
gepIndices.push_back(ConstantInteger::get(0));
|
||
gepIndices.insert(gepIndices.end(), indices.begin(), indices.end());
|
||
}
|
||
// 左值为地址
|
||
LValue = getGEPAddressInst(gepBasePointer, gepIndices);
|
||
}
|
||
|
||
// Value* RValue = std::any_cast<Value *>(visitExp(ctx->exp())); // 右值
|
||
|
||
// 先推断 LValue 的类型
|
||
// 如果 LValue 是指向数组的指针，则需要根据 indices 获取正确的类型
|
||
// 如果 LValue 是标量，则直接使用其类型
|
||
// 注意：LValue 的类型可能是指向数组的指针 (e.g., int(*)[3]) 或者指向标量的指针 (e.g., int*) 也能推断
|
||
Type* LType = builder.getIndexedType(variable->getType(), indices);
|
||
|
||
Value* RValue = computeExp(ctx->exp(), LType); // 右值计算
|
||
Type* RType = RValue->getType();
|
||
|
||
// TODO:computeExp处理了类型转换，可以考虑删除判断逻辑
|
||
if (LType != RType) {
|
||
ConstantValue *constValue = dynamic_cast<ConstantValue *>(RValue);
|
||
if (constValue != nullptr) {
|
||
if (LType == Type::getFloatType()) {
|
||
if(dynamic_cast<ConstantInteger *>(constValue)) {
|
||
// 如果是整型常量，转换为浮点型
|
||
RValue = ConstantFloating::get(static_cast<float>(constValue->getInt()));
|
||
} else if (dynamic_cast<ConstantFloating *>(constValue)) {
|
||
// 如果是浮点型常量，直接使用
|
||
RValue = ConstantFloating::get(static_cast<float>(constValue->getFloat()));
|
||
}
|
||
} else { // 假设如果不是浮点型，就是整型
|
||
if(dynamic_cast<ConstantFloating *>(constValue)) {
|
||
// 如果是浮点型常量，转换为整型
|
||
RValue = ConstantInteger::get(static_cast<int>(constValue->getFloat()));
|
||
} else if (dynamic_cast<ConstantInteger *>(constValue)) {
|
||
// 如果是整型常量，直接使用
|
||
RValue = ConstantInteger::get(static_cast<int>(constValue->getInt()));
|
||
|
||
}
|
||
}
|
||
} else {
|
||
if (LType == Type::getFloatType()) {
|
||
RValue = builder.createItoFInst(RValue);
|
||
} else { // 假设如果不是浮点型，就是整型
|
||
RValue = builder.createFtoIInst(RValue);
|
||
}
|
||
}
|
||
}
|
||
|
||
builder.createStoreInst(RValue, LValue);
|
||
|
||
return std::any();
|
||
}
|
||
|
||
|
||
std::any SysYIRGenerator::visitExpStmt(SysYParser::ExpStmtContext *ctx) {
|
||
// 访问表达式
|
||
if (ctx->exp() != nullptr) {
|
||
computeExp(ctx->exp());
|
||
}
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitIfStmt(SysYParser::IfStmtContext *ctx) {
|
||
// labels string stream
|
||
|
||
std::stringstream labelstring;
|
||
Function * function = builder.getBasicBlock()->getParent();
|
||
|
||
BasicBlock* thenBlock = new BasicBlock(function);
|
||
BasicBlock* exitBlock = new BasicBlock(function);
|
||
|
||
if (ctx->stmt().size() > 1) {
|
||
BasicBlock* elseBlock = new BasicBlock(function);
|
||
|
||
builder.pushTrueBlock(thenBlock);
|
||
builder.pushFalseBlock(elseBlock);
|
||
// 访问条件表达式
|
||
visitCond(ctx->cond());
|
||
builder.popTrueBlock();
|
||
builder.popFalseBlock();
|
||
|
||
labelstring << "if_then.L" << builder.getLabelIndex();
|
||
thenBlock->setName(labelstring.str());
|
||
labelstring.str("");
|
||
function->addBasicBlock(thenBlock);
|
||
builder.setPosition(thenBlock, thenBlock->end());
|
||
|
||
auto block = dynamic_cast<SysYParser::BlockStmtContext *>(ctx->stmt(0));
|
||
// 如果是块语句，直接访问
|
||
// 否则访问语句
|
||
if (block != nullptr) {
|
||
visitBlockStmt(block);
|
||
} else {
|
||
module->enterNewScope();
|
||
ctx->stmt(0)->accept(this);
|
||
module->leaveScope();
|
||
}
|
||
builder.createUncondBrInst(exitBlock);
|
||
BasicBlock::conectBlocks(builder.getBasicBlock(), exitBlock);
|
||
|
||
labelstring << "if_else.L" << builder.getLabelIndex();
|
||
elseBlock->setName(labelstring.str());
|
||
labelstring.str("");
|
||
function->addBasicBlock(elseBlock);
|
||
builder.setPosition(elseBlock, elseBlock->end());
|
||
|
||
block = dynamic_cast<SysYParser::BlockStmtContext *>(ctx->stmt(1));
|
||
if (block != nullptr) {
|
||
visitBlockStmt(block);
|
||
} else {
|
||
module->enterNewScope();
|
||
ctx->stmt(1)->accept(this);
|
||
module->leaveScope();
|
||
}
|
||
builder.createUncondBrInst(exitBlock);
|
||
BasicBlock::conectBlocks(builder.getBasicBlock(), exitBlock);
|
||
|
||
labelstring << "if_exit.L" << builder.getLabelIndex();
|
||
exitBlock->setName(labelstring.str());
|
||
labelstring.str("");
|
||
function->addBasicBlock(exitBlock);
|
||
builder.setPosition(exitBlock, exitBlock->end());
|
||
|
||
} else {
|
||
builder.pushTrueBlock(thenBlock);
|
||
builder.pushFalseBlock(exitBlock);
|
||
visitCond(ctx->cond());
|
||
builder.popTrueBlock();
|
||
builder.popFalseBlock();
|
||
|
||
labelstring << "if_then.L" << builder.getLabelIndex();
|
||
thenBlock->setName(labelstring.str());
|
||
labelstring.str("");
|
||
function->addBasicBlock(thenBlock);
|
||
builder.setPosition(thenBlock, thenBlock->end());
|
||
|
||
auto block = dynamic_cast<SysYParser::BlockStmtContext *>(ctx->stmt(0));
|
||
if (block != nullptr) {
|
||
visitBlockStmt(block);
|
||
} else {
|
||
module->enterNewScope();
|
||
ctx->stmt(0)->accept(this);
|
||
module->leaveScope();
|
||
}
|
||
builder.createUncondBrInst(exitBlock);
|
||
BasicBlock::conectBlocks(builder.getBasicBlock(), exitBlock);
|
||
|
||
labelstring << "if_exit.L" << builder.getLabelIndex();
|
||
exitBlock->setName(labelstring.str());
|
||
labelstring.str("");
|
||
function->addBasicBlock(exitBlock);
|
||
builder.setPosition(exitBlock, exitBlock->end());
|
||
}
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitWhileStmt(SysYParser::WhileStmtContext *ctx) {
|
||
// while structure:
|
||
// curblock -> headBlock -> bodyBlock -> exitBlock
|
||
BasicBlock* curBlock = builder.getBasicBlock();
|
||
Function* function = builder.getBasicBlock()->getParent();
|
||
|
||
std::stringstream labelstring;
|
||
labelstring << "while_head.L" << builder.getLabelIndex();
|
||
BasicBlock *headBlock = function->addBasicBlock(labelstring.str());
|
||
labelstring.str("");
|
||
builder.createUncondBrInst(headBlock);
|
||
BasicBlock::conectBlocks(curBlock, headBlock);
|
||
builder.setPosition(headBlock, headBlock->end());
|
||
|
||
BasicBlock* bodyBlock = new BasicBlock(function);
|
||
BasicBlock* exitBlock = new BasicBlock(function);
|
||
|
||
builder.pushTrueBlock(bodyBlock);
|
||
builder.pushFalseBlock(exitBlock);
|
||
// 访问条件表达式
|
||
visitCond(ctx->cond());
|
||
builder.popTrueBlock();
|
||
builder.popFalseBlock();
|
||
|
||
labelstring << "while_body.L" << builder.getLabelIndex();
|
||
bodyBlock->setName(labelstring.str());
|
||
labelstring.str("");
|
||
function->addBasicBlock(bodyBlock);
|
||
builder.setPosition(bodyBlock, bodyBlock->end());
|
||
|
||
builder.pushBreakBlock(exitBlock);
|
||
builder.pushContinueBlock(headBlock);
|
||
|
||
auto block = dynamic_cast<SysYParser::BlockStmtContext *>(ctx->stmt());
|
||
|
||
if( block != nullptr) {
|
||
visitBlockStmt(block);
|
||
} else {
|
||
module->enterNewScope();
|
||
ctx->stmt()->accept(this);
|
||
module->leaveScope();
|
||
}
|
||
|
||
builder.createUncondBrInst(headBlock);
|
||
BasicBlock::conectBlocks(builder.getBasicBlock(), exitBlock);
|
||
builder.popBreakBlock();
|
||
builder.popContinueBlock();
|
||
|
||
labelstring << "while_exit.L" << builder.getLabelIndex();
|
||
exitBlock->setName(labelstring.str());
|
||
labelstring.str("");
|
||
function->addBasicBlock(exitBlock);
|
||
builder.setPosition(exitBlock, exitBlock->end());
|
||
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitBreakStmt(SysYParser::BreakStmtContext *ctx) {
|
||
BasicBlock* breakBlock = builder.getBreakBlock();
|
||
builder.createUncondBrInst(breakBlock);
|
||
BasicBlock::conectBlocks(builder.getBasicBlock(), breakBlock);
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitContinueStmt(SysYParser::ContinueStmtContext *ctx) {
|
||
BasicBlock* continueBlock = builder.getContinueBlock();
|
||
builder.createUncondBrInst(continueBlock);
|
||
BasicBlock::conectBlocks(builder.getBasicBlock(), continueBlock);
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitReturnStmt(SysYParser::ReturnStmtContext *ctx) {
|
||
Value* returnValue = nullptr;
|
||
Type* funcType = builder.getBasicBlock()->getParent()->getReturnType();
|
||
if (ctx->exp() != nullptr) {
|
||
returnValue = computeExp(ctx->exp(), funcType);
|
||
}
|
||
// TODOL 考虑删除类型转换判断逻辑
|
||
if (returnValue != nullptr && funcType!= returnValue->getType()) {
|
||
ConstantValue * constValue = dynamic_cast<ConstantValue *>(returnValue);
|
||
if (constValue != nullptr) {
|
||
if (funcType == Type::getFloatType()) {
|
||
if(dynamic_cast<ConstantInteger *>(constValue)) {
|
||
// 如果是整型常量，转换为浮点型
|
||
returnValue = ConstantFloating::get(static_cast<float>(constValue->getInt()));
|
||
} else if (dynamic_cast<ConstantFloating *>(constValue)) {
|
||
// 如果是浮点型常量，直接使用
|
||
returnValue = ConstantFloating::get(static_cast<float>(constValue->getInt()));
|
||
}
|
||
} else {
|
||
if(dynamic_cast<ConstantFloating *>(constValue)) {
|
||
// 如果是浮点型常量，转换为整型
|
||
returnValue = ConstantInteger::get(static_cast<int>(constValue->getFloat()));
|
||
} else if (dynamic_cast<ConstantInteger *>(constValue)) {
|
||
// 如果是整型常量，直接使用
|
||
returnValue = ConstantInteger::get(static_cast<int>(constValue->getFloat()));
|
||
}
|
||
}
|
||
} else {
|
||
if (funcType == Type::getFloatType()) {
|
||
returnValue = builder.createItoFInst(returnValue);
|
||
} else {
|
||
returnValue = builder.createFtoIInst(returnValue);
|
||
}
|
||
}
|
||
}
|
||
builder.createReturnInst(returnValue);
|
||
|
||
return std::any();
|
||
}
|
||
|
||
|
||
// 辅助函数：计算给定类型中嵌套的数组维度数量
|
||
// 例如：
|
||
// - 对于 i32* 类型，它指向 i32，维度为 0。
|
||
// - 对于 [10 x i32]* 类型，它指向 [10 x i32]，维度为 1。
|
||
// - 对于 [20 x [10 x i32]]* 类型，它指向 [20 x [10 x i32]]，维度为 2。
|
||
unsigned SysYIRGenerator::countArrayDimensions(Type* type) {
|
||
unsigned dims = 0;
|
||
Type* currentType = type;
|
||
|
||
// 如果是指针类型，先获取它指向的基础类型
|
||
if (currentType->isPointer()) {
|
||
currentType = currentType->as<PointerType>()->getBaseType();
|
||
}
|
||
|
||
// 递归地计算数组的维度层数
|
||
while (currentType && currentType->isArray()) {
|
||
dims++;
|
||
currentType = currentType->as<ArrayType>()->getElementType();
|
||
}
|
||
return dims;
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitLValue(SysYParser::LValueContext *ctx) {
|
||
std::string name = ctx->Ident()->getText();
|
||
Value* variable = module->getVariable(name);
|
||
|
||
Value* value = nullptr;
|
||
|
||
std::vector<Value *> dims;
|
||
for (const auto &exp : ctx->exp()) {
|
||
Value* expValue = std::any_cast<Value *>(computeExp(exp));
|
||
dims.push_back(expValue);
|
||
}
|
||
|
||
// 1. 获取变量的声明维度数量
|
||
unsigned declaredNumDims = countArrayDimensions(variable->getType());
|
||
|
||
// 2. 处理常量变量 (ConstantVariable) 且所有索引都是常量的情况
|
||
ConstantVariable* constVar = dynamic_cast<ConstantVariable *>(variable);
|
||
if (constVar != nullptr) {
|
||
bool allIndicesConstant = true;
|
||
for (const auto &dim : dims) {
|
||
if (dynamic_cast<ConstantValue *>(dim) == nullptr) {
|
||
allIndicesConstant = false;
|
||
break;
|
||
}
|
||
}
|
||
if (allIndicesConstant) {
|
||
// 如果是常量变量且所有索引都是常量，直接通过 getByIndices 获取编译时值
|
||
// 这个方法会根据索引深度返回最终的标量值或指向子数组的指针 (作为 ConstantValue/Variable)
|
||
return constVar->getByIndices(dims);
|
||
}
|
||
}
|
||
|
||
// 3. 处理可变变量 (AllocaInst/GlobalValue) 或带非常量索引的常量变量
|
||
// 这里区分标量访问和数组元素/子数组访问
|
||
|
||
// 检查是否是访问标量变量本身（没有索引，且声明维度为0）
|
||
if (dims.empty() && declaredNumDims == 0) {
|
||
// 对于标量变量，直接加载其值。
|
||
// variable 本身就是指向标量的指针 (e.g., int* %a)
|
||
if (dynamic_cast<AllocaInst*>(variable) || dynamic_cast<GlobalValue*>(variable)) {
|
||
value = builder.createLoadInst(variable);
|
||
} else {
|
||
// 如果走到这里且不是AllocaInst/GlobalValue，但dims为空且declaredNumDims为0，
|
||
// 且又不是ConstantVariable (前面已处理)，则可能是错误情况。
|
||
assert(false && "Unhandled scalar variable type in LValue access.");
|
||
return static_cast<Value*>(nullptr);
|
||
}
|
||
} else {
|
||
// 访问数组元素或子数组（有索引，或变量本身是数组/多维指针）
|
||
Value* gepBasePointer = nullptr;
|
||
std::vector<Value*> gepIndices; // 准备传递给 getGEPAddressInst 的索引列表
|
||
// GEP 的基指针就是变量本身（它是一个指向内存的指针）
|
||
if (AllocaInst *alloc = dynamic_cast<AllocaInst *>(variable)) {
|
||
// 情况 A: 局部变量 (AllocaInst)
|
||
// 获取 AllocaInst 分配的内存的实际类型。
|
||
// 例如：对于 `int b[10][20];`，`allocatedType` 是 `[10 x [20 x i32]]`。
|
||
// 对于 `int b[][20]` 的函数参数，其 AllocaInst 存储的是一个指针，
|
||
// 此时 `allocatedType` 是 `[20 x i32]*`。
|
||
Type* allocatedType = alloc->getType()->as<PointerType>()->getBaseType();
|
||
|
||
if (allocatedType->isPointer()) {
|
||
// 如果 AllocaInst 分配的是一个指针类型 (例如，用于存储函数参数的指针，如 int b[][20] 中的 b)
|
||
// 即 `allocatedType` 是一个指向数组指针的指针 (e.g., [20 x i32]**)
|
||
// 那么 GEP 的基指针是加载这个指针变量的值。
|
||
gepBasePointer = builder.createLoadInst(alloc); // 加载出实际的指针值 (e.g., [20 x i32]*)
|
||
// 对于这种参数指针，用户提供的索引直接作用于它。不需要额外的 0。
|
||
gepIndices = dims;
|
||
} else {
|
||
// 如果 AllocaInst 分配的是实际的数组数据 (例如，int b[10][20] 中的 b)
|
||
// 那么 AllocaInst 本身就是 GEP 的基指针。
|
||
// 这里的 `alloc` 是指向数组的指针 (e.g., [10 x [20 x i32]]*)
|
||
gepBasePointer = alloc; // 类型是 [10 x [20 x i32]]*
|
||
// 对于这种完整的数组分配，GEP 的第一个索引必须是 0，用于“步过”整个数组。
|
||
gepIndices.push_back(ConstantInteger::get(0));
|
||
gepIndices.insert(gepIndices.end(), dims.begin(), dims.end());
|
||
}
|
||
} else if (GlobalValue *glob = dynamic_cast<GlobalValue *>(variable)) {
|
||
// 情况 B: 全局变量 (GlobalValue)
|
||
// GlobalValue 总是指向全局数据的指针。
|
||
gepBasePointer = glob; // 类型是 [61 x [67 x i32]]*
|
||
// 对于全局数组，GEP 的第一个索引必须是 0，用于“步过”整个数组。
|
||
gepIndices.push_back(ConstantInteger::get(0));
|
||
gepIndices.insert(gepIndices.end(), dims.begin(), dims.end());
|
||
} else if (ConstantVariable *constV = dynamic_cast<ConstantVariable *>(variable)) {
|
||
// 情况 C: 常量变量 (ConstantVariable)，如果它代表全局数组常量
|
||
// 假设 ConstantVariable 可以直接作为 GEP 的基指针。
|
||
gepBasePointer = constV;
|
||
// 对于常量数组，也需要 0 索引来“步过”整个数组。
|
||
// 这里可以进一步检查 constV->getType()->as<PointerType>()->getBaseType()->isArray()
|
||
// 但为了简洁，假设所有 ConstantVariable 作为 GEP 基指针时都需要此 0。
|
||
gepIndices.push_back(ConstantInteger::get(0));
|
||
gepIndices.insert(gepIndices.end(), dims.begin(), dims.end());
|
||
} else {
|
||
assert(false && "LValue variable type not supported for GEP base pointer.");
|
||
return static_cast<Value *>(nullptr);
|
||
}
|
||
|
||
// 现在调用 getGEPAddressInst，传入正确准备的基指针和索引列表
|
||
Value *targetAddress = getGEPAddressInst(gepBasePointer, gepIndices);
|
||
|
||
// 如果提供的索引数量少于声明的维度数量，则表示访问的是子数组，返回其地址
|
||
if (dims.size() < declaredNumDims) {
|
||
value = targetAddress;
|
||
} else {
|
||
// 否则，表示访问的是最终的标量元素，加载其值
|
||
// 假设 createLoadInst 接受 Value* pointer
|
||
value = builder.createLoadInst(targetAddress);
|
||
}
|
||
}
|
||
return value;
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitPrimaryExp(SysYParser::PrimaryExpContext *ctx) {
|
||
if (ctx->exp() != nullptr) {
|
||
BinaryExpStack.push_back(BinaryOp::LPAREN);BinaryExpLenStack.back()++;
|
||
visitExp(ctx->exp());
|
||
BinaryExpStack.push_back(BinaryOp::RPAREN);BinaryExpLenStack.back()++;
|
||
}
|
||
|
||
if (ctx->lValue() != nullptr) {
|
||
// 如果是 lValue，将value压入栈中
|
||
BinaryExpStack.push_back(std::any_cast<Value *>(visitLValue(ctx->lValue())));BinaryExpLenStack.back()++;
|
||
}
|
||
if (ctx->number() != nullptr) {
|
||
BinaryExpStack.push_back(std::any_cast<Value *>(visitNumber(ctx->number())));BinaryExpLenStack.back()++;
|
||
}
|
||
if (ctx->string() != nullptr) {
|
||
cout << "String literal not supported in SysYIRGenerator." << endl;
|
||
}
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitNumber(SysYParser::NumberContext *ctx) {
|
||
if (ctx->ILITERAL() != nullptr) {
|
||
int value = std::stol(ctx->ILITERAL()->getText(), nullptr, 0);
|
||
return static_cast<Value *>(ConstantInteger::get(value));
|
||
} else if (ctx->FLITERAL() != nullptr) {
|
||
float value = std::stof(ctx->FLITERAL()->getText());
|
||
return static_cast<Value *>(ConstantFloating::get(value));
|
||
}
|
||
throw std::runtime_error("Unknown number type.");
|
||
return std::any(); // 不会到达这里
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitCall(SysYParser::CallContext *ctx) {
|
||
std::string funcName = ctx->Ident()->getText();
|
||
Function *function = module->getFunction(funcName);
|
||
if (function == nullptr) {
|
||
function = module->getExternalFunction(funcName);
|
||
if (function == nullptr) {
|
||
std::cout << "The function " << funcName << " no defined." << std::endl;
|
||
assert(function);
|
||
}
|
||
}
|
||
|
||
std::vector<Value *> args = {};
|
||
if (funcName == "starttime" || funcName == "stoptime") {
|
||
args.emplace_back(
|
||
ConstantInteger::get(static_cast<int>(ctx->getStart()->getLine())));
|
||
} else {
|
||
if (ctx->funcRParams() != nullptr) {
|
||
args = std::any_cast<std::vector<Value *>>(visitFuncRParams(ctx->funcRParams()));
|
||
}
|
||
|
||
// 获取形参列表。`getArguments()` 返回的是 `Argument*` 的集合，
|
||
// 每个 `Argument` 代表一个函数形参，其 `getType()` 就是指向形参的类型的指针类型。
|
||
auto formalParams = function->getArguments();
|
||
|
||
// 检查实参和形参数量是否匹配。
|
||
if (args.size() != formalParams.size()) {
|
||
std::cerr << "Error: Function call argument count mismatch for function '" << funcName << "'." << std::endl;
|
||
assert(false && "Function call argument count mismatch!");
|
||
}
|
||
|
||
for (int i = 0; i < args.size(); i++) {
|
||
// 形参的类型 (e.g., i32, float, i32*, [10 x i32]*)
|
||
Type* formalParamExpectedValueType = formalParams[i]->getType();
|
||
// 实参的实际类型 (e.g., i32, float, i32*, [67 x i32]*)
|
||
Type* actualArgType = args[i]->getType();
|
||
// 如果实参类型与形参类型不匹配，则尝试进行类型转换
|
||
if (formalParamExpectedValueType != actualArgType) {
|
||
ConstantValue *constValue = dynamic_cast<ConstantValue *>(args[i]);
|
||
if (constValue != nullptr) {
|
||
if (formalParamExpectedValueType->isInt() && actualArgType->isFloat()) {
|
||
args[i] = ConstantInteger::get(static_cast<int>(constValue->getFloat()));
|
||
} else if (formalParamExpectedValueType->isFloat() && actualArgType->isInt()) {
|
||
args[i] = ConstantFloating::get(static_cast<float>(constValue->getInt()));
|
||
} else {
|
||
// 如果是常量但不是简单的 int/float 标量转换，
|
||
// 或者是指针常量需要 bitcast，则让它进入非常量转换逻辑。
|
||
// 例如，一个常量数组的地址，需要 bitcast 成另一种指针类型。
|
||
// 目前不知道样例有没有这种情况，所以这里不做处理。
|
||
}
|
||
}
|
||
else {
|
||
// 1. 标量值类型转换 (例如：int_reg 到 float_reg，float_reg 到 int_reg)
|
||
if (formalParamExpectedValueType->isInt() && actualArgType->isFloat()) {
|
||
args[i] = builder.createFtoIInst(args[i]);
|
||
} else if (formalParamExpectedValueType->isFloat() && actualArgType->isInt()) {
|
||
args[i] = builder.createItoFInst(args[i]);
|
||
}
|
||
// 2. 指针类型转换 (例如数组退化：`[N x T]*` 到 `T*`，或兼容指针类型之间) TODO：不清楚有没有这种样例
|
||
// 这种情况常见于数组参数，实参可能是一个更具体的数组指针类型，
|
||
// 而形参是其退化后的基础指针类型。LLVM 的 `bitcast` 指令可以用于
|
||
// 在相同大小的指针类型之间进行转换，这对于数组退化至关重要。
|
||
// else if (formalParamType->isPointer() && actualArgType->isPointer()) {
|
||
// 检查指针基类型是否兼容，或者是否是数组退化导致的类型不同。
|
||
// 使用 bitcast，
|
||
// args[i] = builder.createBitCastInst(args[i], formalParamType);
|
||
// }
|
||
// 3. 其他未预期的类型不匹配
|
||
// 如果代码执行到这里，说明存在编译器前端未处理的类型不兼容或错误。
|
||
else {
|
||
// assert(false && "Unhandled type mismatch for function call argument.");
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return static_cast<Value *>(builder.createCallInst(function, args));
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitUnaryExp(SysYParser::UnaryExpContext *ctx) {
|
||
if (ctx->primaryExp() != nullptr) {
|
||
visitPrimaryExp(ctx->primaryExp());
|
||
} else if (ctx->call() != nullptr) {
|
||
BinaryExpStack.push_back(std::any_cast<Value *>(visitCall(ctx->call())));BinaryExpLenStack.back()++;
|
||
} else if (ctx->unaryOp() != nullptr) {
|
||
// 遇到一元操作符，将其压入 BinaryExpStack
|
||
auto opNode = dynamic_cast<antlr4::tree::TerminalNode*>(ctx->unaryOp()->children[0]);
|
||
int opType = opNode->getSymbol()->getType();
|
||
switch(opType) {
|
||
case SysYParser::ADD: BinaryExpStack.push_back(BinaryOp::PLUS); BinaryExpLenStack.back()++; break;
|
||
case SysYParser::SUB: BinaryExpStack.push_back(BinaryOp::NEG); BinaryExpLenStack.back()++; break;
|
||
case SysYParser::NOT: BinaryExpStack.push_back(BinaryOp::NOT); BinaryExpLenStack.back()++; break;
|
||
default: assert(false && "Unexpected operator in UnaryExp.");
|
||
}
|
||
visitUnaryExp(ctx->unaryExp());
|
||
}
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitFuncRParams(SysYParser::FuncRParamsContext *ctx) {
|
||
std::vector<Value *> params;
|
||
for (const auto &exp : ctx->exp()) {
|
||
auto param = std::any_cast<Value *>(computeExp(exp));
|
||
params.push_back(param);
|
||
}
|
||
|
||
return params;
|
||
}
|
||
|
||
|
||
std::any SysYIRGenerator::visitMulExp(SysYParser::MulExpContext *ctx) {
|
||
visitUnaryExp(ctx->unaryExp(0));
|
||
|
||
for (int i = 1; i < ctx->unaryExp().size(); i++) {
|
||
auto opNode = dynamic_cast<antlr4::tree::TerminalNode*>(ctx->children[2*i-1]);
|
||
int opType = opNode->getSymbol()->getType();
|
||
switch(opType) {
|
||
case SysYParser::MUL: BinaryExpStack.push_back(BinaryOp::MUL); BinaryExpLenStack.back()++; break;
|
||
case SysYParser::DIV: BinaryExpStack.push_back(BinaryOp::DIV); BinaryExpLenStack.back()++; break;
|
||
case SysYParser::MOD: BinaryExpStack.push_back(BinaryOp::MOD); BinaryExpLenStack.back()++; break;
|
||
default: assert(false && "Unexpected operator in MulExp.");
|
||
}
|
||
visitUnaryExp(ctx->unaryExp(i));
|
||
}
|
||
return std::any();
|
||
}
|
||
|
||
|
||
std::any SysYIRGenerator::visitAddExp(SysYParser::AddExpContext *ctx) {
|
||
visitMulExp(ctx->mulExp(0));
|
||
|
||
for (int i = 1; i < ctx->mulExp().size(); i++) {
|
||
auto opNode = dynamic_cast<antlr4::tree::TerminalNode*>(ctx->children[2*i-1]);
|
||
int opType = opNode->getSymbol()->getType();
|
||
switch(opType) {
|
||
case SysYParser::ADD: BinaryExpStack.push_back(BinaryOp::ADD); BinaryExpLenStack.back()++; break;
|
||
case SysYParser::SUB: BinaryExpStack.push_back(BinaryOp::SUB); BinaryExpLenStack.back()++; break;
|
||
default: assert(false && "Unexpected operator in AddExp.");
|
||
}
|
||
visitMulExp(ctx->mulExp(i));
|
||
}
|
||
return std::any();
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitRelExp(SysYParser::RelExpContext *ctx) {
|
||
Value* result = computeAddExp(ctx->addExp(0));
|
||
|
||
for (int i = 1; i < ctx->addExp().size(); i++) {
|
||
auto opNode = dynamic_cast<antlr4::tree::TerminalNode*>(ctx->children[2*i-1]);
|
||
int opType = opNode->getSymbol()->getType();
|
||
|
||
Value* operand = computeAddExp(ctx->addExp(i));
|
||
|
||
Type* resultType = result->getType();
|
||
Type* operandType = operand->getType();
|
||
|
||
ConstantValue* constResult = dynamic_cast<ConstantValue *>(result);
|
||
ConstantValue* constOperand = dynamic_cast<ConstantValue *>(operand);
|
||
|
||
// 常量比较
|
||
if ((constResult != nullptr) && (constOperand != nullptr)) {
|
||
auto operand1 = constResult->isFloat() ? constResult->getFloat()
|
||
: constResult->getInt();
|
||
auto operand2 = constOperand->isFloat() ? constOperand->getFloat()
|
||
: constOperand->getInt();
|
||
|
||
if (opType == SysYParser::LT) result = ConstantInteger::get(operand1 < operand2 ? 1 : 0);
|
||
else if (opType == SysYParser::GT) result = ConstantInteger::get(operand1 > operand2 ? 1 : 0);
|
||
else if (opType == SysYParser::LE) result = ConstantInteger::get(operand1 <= operand2 ? 1 : 0);
|
||
else if (opType == SysYParser::GE) result = ConstantInteger::get(operand1 >= operand2 ? 1 : 0);
|
||
else assert(false);
|
||
|
||
} else {
|
||
Type* resultType = result->getType();
|
||
Type* operandType = operand->getType();
|
||
Type* floatType = Type::getFloatType();
|
||
|
||
// 浮点数处理
|
||
if (resultType == floatType || operandType == floatType) {
|
||
if (resultType != floatType) {
|
||
if (constResult != nullptr){
|
||
if(dynamic_cast<ConstantInteger *>(constResult)) {
|
||
// 如果是整型常量，转换为浮点型
|
||
result = ConstantFloating::get(static_cast<float>(constResult->getInt()));
|
||
} else if (dynamic_cast<ConstantFloating *>(constResult)) {
|
||
// 如果是浮点型常量，直接使用
|
||
result = ConstantFloating::get(static_cast<float>(constResult->getFloat()));
|
||
}
|
||
}
|
||
else
|
||
result = builder.createItoFInst(result);
|
||
|
||
}
|
||
if (operandType != floatType) {
|
||
if (constOperand != nullptr) {
|
||
if(dynamic_cast<ConstantInteger *>(constOperand)) {
|
||
// 如果是整型常量，转换为浮点型
|
||
operand = ConstantFloating::get(static_cast<float>(constOperand->getInt()));
|
||
} else if (dynamic_cast<ConstantFloating *>(constOperand)) {
|
||
// 如果是浮点型常量，直接使用
|
||
operand = ConstantFloating::get(static_cast<float>(constOperand->getFloat()));
|
||
}
|
||
}
|
||
else
|
||
operand = builder.createItoFInst(operand);
|
||
|
||
}
|
||
|
||
if (opType == SysYParser::LT) result = builder.createFCmpLTInst(result, operand);
|
||
else if (opType == SysYParser::GT) result = builder.createFCmpGTInst(result, operand);
|
||
else if (opType == SysYParser::LE) result = builder.createFCmpLEInst(result, operand);
|
||
else if (opType == SysYParser::GE) result = builder.createFCmpGEInst(result, operand);
|
||
else assert(false);
|
||
|
||
} else {
|
||
// 整数处理
|
||
if (opType == SysYParser::LT) result = builder.createICmpLTInst(result, operand);
|
||
else if (opType == SysYParser::GT) result = builder.createICmpGTInst(result, operand);
|
||
else if (opType == SysYParser::LE) result = builder.createICmpLEInst(result, operand);
|
||
else if (opType == SysYParser::GE) result = builder.createICmpGEInst(result, operand);
|
||
else assert(false);
|
||
|
||
}
|
||
}
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
|
||
std::any SysYIRGenerator::visitEqExp(SysYParser::EqExpContext *ctx) {
|
||
// TODO：其实已经保证了result是一个int类型的值可以删除冗余判断逻辑
|
||
Value * result = std::any_cast<Value *>(visitRelExp(ctx->relExp(0)));
|
||
|
||
for (int i = 1; i < ctx->relExp().size(); i++) {
|
||
auto opNode = dynamic_cast<antlr4::tree::TerminalNode*>(ctx->children[2*i-1]);
|
||
int opType = opNode->getSymbol()->getType();
|
||
|
||
Value * operand = std::any_cast<Value *>(visitRelExp(ctx->relExp(i)));
|
||
|
||
ConstantValue* constResult = dynamic_cast<ConstantValue *>(result);
|
||
ConstantValue* constOperand = dynamic_cast<ConstantValue *>(operand);
|
||
|
||
if ((constResult != nullptr) && (constOperand != nullptr)) {
|
||
auto operand1 = constResult->isFloat() ? constResult->getFloat()
|
||
: constResult->getInt();
|
||
auto operand2 = constOperand->isFloat() ? constOperand->getFloat()
|
||
: constOperand->getInt();
|
||
|
||
if (opType == SysYParser::EQ) result = ConstantInteger::get(operand1 == operand2 ? 1 : 0);
|
||
else if (opType == SysYParser::NE) result = ConstantInteger::get(operand1 != operand2 ? 1 : 0);
|
||
else assert(false);
|
||
|
||
} else {
|
||
Type* resultType = result->getType();
|
||
Type* operandType = operand->getType();
|
||
Type* floatType = Type::getFloatType();
|
||
|
||
if (resultType == floatType || operandType == floatType) {
|
||
if (resultType != floatType) {
|
||
if (constResult != nullptr){
|
||
if(dynamic_cast<ConstantInteger *>(constResult)) {
|
||
// 如果是整型常量，转换为浮点型
|
||
result = ConstantFloating::get(static_cast<float>(constResult->getInt()));
|
||
} else if (dynamic_cast<ConstantFloating *>(constResult)) {
|
||
// 如果是浮点型常量，直接使用
|
||
result = ConstantFloating::get(static_cast<float>(constResult->getFloat()));
|
||
}
|
||
}
|
||
else
|
||
result = builder.createItoFInst(result);
|
||
}
|
||
if (operandType != floatType) {
|
||
if (constOperand != nullptr) {
|
||
if(dynamic_cast<ConstantInteger *>(constOperand)) {
|
||
// 如果是整型常量，转换为浮点型
|
||
operand = ConstantFloating::get(static_cast<float>(constOperand->getInt()));
|
||
} else if (dynamic_cast<ConstantFloating *>(constOperand)) {
|
||
// 如果是浮点型常量，直接使用
|
||
operand = ConstantFloating::get(static_cast<float>(constOperand->getFloat()));
|
||
}
|
||
}
|
||
else
|
||
operand = builder.createItoFInst(operand);
|
||
}
|
||
|
||
if (opType == SysYParser::EQ) result = builder.createFCmpEQInst(result, operand);
|
||
else if (opType == SysYParser::NE) result = builder.createFCmpNEInst(result, operand);
|
||
else assert(false);
|
||
|
||
} else {
|
||
|
||
if (opType == SysYParser::EQ) result = builder.createICmpEQInst(result, operand);
|
||
else if (opType == SysYParser::NE) result = builder.createICmpNEInst(result, operand);
|
||
else assert(false);
|
||
|
||
}
|
||
}
|
||
}
|
||
|
||
if (ctx->relExp().size() == 1) {
|
||
ConstantValue * constResult = dynamic_cast<ConstantValue *>(result);
|
||
// 如果只有一个关系表达式，则将结果转换为0或1
|
||
if (constResult != nullptr) {
|
||
if (constResult->isFloat())
|
||
result = ConstantInteger::get(constResult->getFloat() != 0.0F ? 1 : 0);
|
||
else
|
||
result = ConstantInteger::get(constResult->getInt() != 0 ? 1 : 0);
|
||
}
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
std::any SysYIRGenerator::visitLAndExp(SysYParser::LAndExpContext *ctx){
|
||
std::stringstream labelstring;
|
||
BasicBlock *curBlock = builder.getBasicBlock();
|
||
Function *function = builder.getBasicBlock()->getParent();
|
||
BasicBlock *trueBlock = builder.getTrueBlock();
|
||
BasicBlock *falseBlock = builder.getFalseBlock();
|
||
auto conds = ctx->eqExp();
|
||
|
||
for (int i = 0; i < conds.size() - 1; i++) {
|
||
|
||
labelstring << "AND.L" << builder.getLabelIndex();
|
||
BasicBlock *newtrueBlock = function->addBasicBlock(labelstring.str());
|
||
labelstring.str("");
|
||
|
||
auto cond = std::any_cast<Value *>(visitEqExp(ctx->eqExp(i)));
|
||
builder.createCondBrInst(cond, newtrueBlock, falseBlock);
|
||
|
||
BasicBlock::conectBlocks(curBlock, newtrueBlock);
|
||
BasicBlock::conectBlocks(curBlock, falseBlock);
|
||
|
||
curBlock = newtrueBlock;
|
||
builder.setPosition(curBlock, curBlock->end());
|
||
}
|
||
|
||
auto cond = std::any_cast<Value *>(visitEqExp(conds.back()));
|
||
builder.createCondBrInst(cond, trueBlock, falseBlock);
|
||
|
||
BasicBlock::conectBlocks(curBlock, trueBlock);
|
||
BasicBlock::conectBlocks(curBlock, falseBlock);
|
||
|
||
return std::any();
|
||
}
|
||
|
||
auto SysYIRGenerator::visitLOrExp(SysYParser::LOrExpContext *ctx) -> std::any {
|
||
std::stringstream labelstring;
|
||
BasicBlock *curBlock = builder.getBasicBlock();
|
||
Function *function = curBlock->getParent();
|
||
auto conds = ctx->lAndExp();
|
||
|
||
for (int i = 0; i < conds.size() - 1; i++) {
|
||
labelstring << "OR.L" << builder.getLabelIndex();
|
||
BasicBlock *newFalseBlock = function->addBasicBlock(labelstring.str());
|
||
labelstring.str("");
|
||
|
||
builder.pushFalseBlock(newFalseBlock);
|
||
visitLAndExp(ctx->lAndExp(i));
|
||
builder.popFalseBlock();
|
||
|
||
builder.setPosition(newFalseBlock, newFalseBlock->end());
|
||
}
|
||
|
||
visitLAndExp(conds.back());
|
||
|
||
return std::any();
|
||
}
|
||
|
||
// attention : 这里的type是数组元素的type
|
||
void Utils::tree2Array(Type *type, ArrayValueTree *root,
|
||
const std::vector<Value *> &dims, unsigned numDims,
|
||
ValueCounter &result, IRBuilder *builder) {
|
||
Value* value = root->getValue();
|
||
auto &children = root->getChildren();
|
||
// 类型转换
|
||
if (value != nullptr) {
|
||
if (type == value->getType()) {
|
||
result.push_back(value);
|
||
} else {
|
||
if (type == Type::getFloatType()) {
|
||
ConstantValue* constValue = dynamic_cast<ConstantValue *>(value);
|
||
if (constValue != nullptr) {
|
||
if(dynamic_cast<ConstantInteger *>(constValue))
|
||
result.push_back(ConstantFloating::get(static_cast<float>(constValue->getInt())));
|
||
else if (dynamic_cast<ConstantFloating *>(constValue))
|
||
result.push_back(ConstantFloating::get(static_cast<float>(constValue->getFloat())));
|
||
else
|
||
assert(false && "Unknown constant type for float conversion.");
|
||
}
|
||
else
|
||
result.push_back(builder->createItoFInst(value));
|
||
|
||
} else {
|
||
ConstantValue* constValue = dynamic_cast<ConstantValue *>(value);
|
||
if (constValue != nullptr){
|
||
if(dynamic_cast<ConstantInteger *>(constValue))
|
||
result.push_back(ConstantInteger::get(constValue->getInt()));
|
||
else if (dynamic_cast<ConstantFloating *>(constValue))
|
||
result.push_back(ConstantInteger::get(static_cast<int>(constValue->getFloat())));
|
||
else
|
||
assert(false && "Unknown constant type for int conversion.");
|
||
}
|
||
else
|
||
result.push_back(builder->createFtoIInst(value));
|
||
|
||
}
|
||
}
|
||
return;
|
||
}
|
||
|
||
auto beforeSize = result.size();
|
||
for (const auto &child : children) {
|
||
int begin = result.size();
|
||
int newNumDims = 0;
|
||
for (unsigned i = 0; i < numDims - 1; i++) {
|
||
auto dim = dynamic_cast<ConstantValue *>(*(dims.rbegin() + i))->getInt();
|
||
if (begin % dim == 0) {
|
||
newNumDims += 1;
|
||
begin /= dim;
|
||
} else {
|
||
break;
|
||
}
|
||
}
|
||
tree2Array(type, child.get(), dims, newNumDims, result, builder);
|
||
}
|
||
auto afterSize = result.size();
|
||
|
||
int blockSize = 1;
|
||
for (unsigned i = 0; i < numDims; i++) {
|
||
blockSize *= dynamic_cast<ConstantValue *>(*(dims.rbegin() + i))->getInt();
|
||
}
|
||
|
||
int num = blockSize - afterSize + beforeSize;
|
||
if (num > 0) {
|
||
if (type == Type::getFloatType())
|
||
result.push_back(ConstantFloating::get(0.0F), num);
|
||
else
|
||
result.push_back(ConstantInteger::get(0), num);
|
||
}
|
||
}
|
||
|
||
void Utils::createExternalFunction(
|
||
const std::vector<Type *> ¶mTypes,
|
||
const std::vector<std::string> ¶mNames,
|
||
const std::vector<std::vector<Value *>> ¶mDims, Type *returnType,
|
||
const std::string &funcName, Module *pModule, IRBuilder *pBuilder) {
|
||
auto funcType = Type::getFunctionType(returnType, paramTypes);
|
||
auto function = pModule->createExternalFunction(funcName, funcType);
|
||
auto entry = function->getEntryBlock();
|
||
pBuilder->setPosition(entry, entry->end());
|
||
|
||
for (int i = 0; i < paramTypes.size(); ++i) {
|
||
auto arg = new Argument(paramTypes[i], function, i, paramNames[i]);
|
||
auto alloca = pBuilder->createAllocaInst(
|
||
Type::getPointerType(paramTypes[i]), paramNames[i]);
|
||
function->insertArgument(arg);
|
||
auto store = pBuilder->createStoreInst(arg, alloca);
|
||
pModule->addVariable(paramNames[i], alloca);
|
||
}
|
||
}
|
||
|
||
void Utils::initExternalFunction(Module *pModule, IRBuilder *pBuilder) {
|
||
std::vector<Type *> paramTypes;
|
||
std::vector<std::string> paramNames;
|
||
std::vector<std::vector<Value *>> paramDims;
|
||
Type *returnType;
|
||
std::string funcName;
|
||
|
||
returnType = Type::getIntType();
|
||
funcName = "getint";
|
||
Utils::createExternalFunction(paramTypes, paramNames, paramDims, returnType,
|
||
funcName, pModule, pBuilder);
|
||
funcName = "getch";
|
||
Utils::createExternalFunction(paramTypes, paramNames, paramDims, returnType,
|
||
funcName, pModule, pBuilder);
|
||
paramTypes.push_back(Type::getIntType());
|
||
paramNames.emplace_back("x");
|
||
paramDims.push_back(std::vector<Value *>{ConstantInteger::get(-1)});
|
||
funcName = "getarray";
|
||
Utils::createExternalFunction(paramTypes, paramNames, paramDims, returnType,
|
||
funcName, pModule, pBuilder);
|
||
|
||
returnType = Type::getFloatType();
|
||
paramTypes.clear();
|
||
paramNames.clear();
|
||
paramDims.clear();
|
||
funcName = "getfloat";
|
||
Utils::createExternalFunction(paramTypes, paramNames, paramDims, returnType,
|
||
funcName, pModule, pBuilder);
|
||
|
||
returnType = Type::getIntType();
|
||
paramTypes.push_back(Type::getFloatType());
|
||
paramNames.emplace_back("x");
|
||
paramDims.push_back(std::vector<Value *>{ConstantInteger::get(-1)});
|
||
funcName = "getfarray";
|
||
Utils::createExternalFunction(paramTypes, paramNames, paramDims, returnType,
|
||
funcName, pModule, pBuilder);
|
||
|
||
returnType = Type::getVoidType();
|
||
|
||
paramTypes.clear();
|
||
paramTypes.push_back(Type::getIntType());
|
||
paramDims.clear();
|
||
paramDims.emplace_back();
|
||
funcName = "putint";
|
||
Utils::createExternalFunction(paramTypes, paramNames, paramDims, returnType,
|
||
funcName, pModule, pBuilder);
|
||
|
||
funcName = "putch";
|
||
Utils::createExternalFunction(paramTypes, paramNames, paramDims, returnType,
|
||
funcName, pModule, pBuilder);
|
||
|
||
paramTypes.clear();
|
||
paramTypes.push_back(Type::getIntType());
|
||
paramTypes.push_back(Type::getIntType());
|
||
paramDims.clear();
|
||
paramDims.emplace_back();
|
||
paramDims.push_back(std::vector<Value *>{ConstantInteger::get(-1)});
|
||
paramNames.clear();
|
||
paramNames.emplace_back("n");
|
||
paramNames.emplace_back("a");
|
||
funcName = "putarray";
|
||
Utils::createExternalFunction(paramTypes, paramNames, paramDims, returnType,
|
||
funcName, pModule, pBuilder);
|
||
|
||
paramTypes.clear();
|
||
paramTypes.push_back(Type::getFloatType());
|
||
paramDims.clear();
|
||
paramDims.emplace_back();
|
||
paramNames.clear();
|
||
paramNames.emplace_back("a");
|
||
funcName = "putfloat";
|
||
Utils::createExternalFunction(paramTypes, paramNames, paramDims, returnType,
|
||
funcName, pModule, pBuilder);
|
||
|
||
paramTypes.clear();
|
||
paramTypes.push_back(Type::getIntType());
|
||
paramTypes.push_back(Type::getFloatType());
|
||
paramDims.clear();
|
||
paramDims.emplace_back();
|
||
paramDims.push_back(std::vector<Value *>{ConstantInteger::get(-1)});
|
||
paramNames.clear();
|
||
paramNames.emplace_back("n");
|
||
paramNames.emplace_back("a");
|
||
funcName = "putfarray";
|
||
Utils::createExternalFunction(paramTypes, paramNames, paramDims, returnType,
|
||
funcName, pModule, pBuilder);
|
||
|
||
paramTypes.clear();
|
||
paramTypes.push_back(Type::getIntType());
|
||
paramDims.clear();
|
||
paramDims.emplace_back();
|
||
paramNames.clear();
|
||
paramNames.emplace_back("__LINE__");
|
||
funcName = "starttime";
|
||
Utils::createExternalFunction(paramTypes, paramNames, paramDims, returnType,
|
||
funcName, pModule, pBuilder);
|
||
|
||
paramTypes.clear();
|
||
paramTypes.push_back(Type::getIntType());
|
||
paramDims.clear();
|
||
paramDims.emplace_back();
|
||
paramNames.clear();
|
||
paramNames.emplace_back("__LINE__");
|
||
funcName = "stoptime";
|
||
Utils::createExternalFunction(paramTypes, paramNames, paramDims, returnType,
|
||
funcName, pModule, pBuilder);
|
||
|
||
}
|
||
|
||
} // namespace sysy
|