239 lines
9.0 KiB
C++
239 lines
9.0 KiB
C++
#include "SysYIRGenerator.h"
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#include <iomanip>
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std::string SysYIRGenerator::generateIR(SysYParser::CompUnitContext* unit) {
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visitCompUnit(unit);
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return irStream.str();
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}
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std::string SysYIRGenerator::getNextTemp() {
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return "%" + std::to_string(tempCounter++);
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}
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std::string SysYIRGenerator::getLLVMType(const std::string& type) {
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if (type == "int") return "i32";
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if (type == "float") return "float";
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if (type.find("[]") != std::string::npos)
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return getLLVMType(type.substr(0, type.size() - 2)) + "*";
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return "i32";
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}
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std::any SysYIRGenerator::visitCompUnit(SysYParser::CompUnitContext* ctx) {
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for (auto decl : ctx->decl()) {
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decl->accept(this);
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}
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for (auto funcDef : ctx->funcDef()) {
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funcDef->accept(this);
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}
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return nullptr;
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}
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std::any SysYIRGenerator::visitConstDecl(SysYParser::ConstDeclContext* ctx) {
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// 常量声明暂不处理（LLVM IR 中常量通常内联）
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return nullptr;
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}
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std::any SysYIRGenerator::visitVarDecl(SysYParser::VarDeclContext* ctx) {
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for (auto varDef : ctx->varDef()) {
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varDef->accept(this);
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}
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return nullptr;
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}
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std::any SysYIRGenerator::visitFuncDef(SysYParser::FuncDefContext* ctx) {
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currentFunction = ctx->Ident()->getText();
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symbolTable.clear();
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// 函数头
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std::string returnType = getLLVMType(ctx->funcType()->getText());
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irStream << "define " << returnType << " @" << currentFunction << "(";
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// 参数
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auto paramsCtx = ctx->funcFParams();
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if (paramsCtx) {
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auto params = paramsCtx->funcFParam();
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for (size_t i = 0; i < params.size(); ++i) {
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if (i > 0) irStream << ", ";
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auto param = params[i];
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std::string paramName = "%" + std::to_string(i);
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std::string paramType = getLLVMType(param->bType()->getText());
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irStream << paramType << " " << paramName;
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// 分配参数
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std::string allocaName = getNextTemp();
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symbolTable[param->Ident()->getText()] = allocaName;
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irStream << "\n " << allocaName << " = alloca " << paramType;
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irStream << "\n store " << paramType << " %" << i << ", " << paramType << "* " << allocaName;
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}
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}
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irStream << ") {\nentry:\n";
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// 函数体
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ctx->blockStmt()->accept(this);
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// 默认返回值
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if (returnType == "void") {
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irStream << " ret void\n";
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} else {
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irStream << " ret " << returnType << " 0\n";
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}
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irStream << "}\n\n";
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return nullptr;
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}
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std::any SysYIRGenerator::visitBlockStmt(SysYParser::BlockStmtContext* ctx) {
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for (auto item : ctx->blockItem()) {
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item->accept(this);
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}
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return nullptr;
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}
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std::any SysYIRGenerator::visitStmt(SysYParser::StmtContext* ctx) {
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if (ctx->lValue() && ctx->exp()) {
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// 赋值语句
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std::string lhs = std::any_cast<std::string>(ctx->lValue()->accept(this));
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std::string rhs = std::any_cast<std::string>(ctx->exp()->accept(this));
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irStream << " store " << getLLVMType("") << " " << rhs << ", " << getLLVMType("") << "* " << lhs << "\n";
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} else if (ctx->RETURN()) {
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// 返回语句
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if (ctx->exp()) {
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std::string value = std::any_cast<std::string>(ctx->exp()->accept(this));
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irStream << " ret " << getLLVMType("") << " " << value << "\n";
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} else {
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irStream << " ret void\n";
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}
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}
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return nullptr;
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}
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std::any SysYIRGenerator::visitLValue(SysYParser::LValueContext* ctx) {
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std::string varName = ctx->Ident()->getText();
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if (symbolTable.find(varName) == symbolTable.end()) {
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std::string allocaName = getNextTemp();
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symbolTable[varName] = allocaName;
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irStream << " " << allocaName << " = alloca " << getLLVMType("") << "\n";
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}
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return symbolTable[varName];
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}
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std::any SysYIRGenerator::visitNumber(SysYParser::NumberContext* ctx) {
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if (ctx->ILITERAL()) {
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return "i32 " + ctx->ILITERAL()->getText();
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} else if (ctx->FLITERAL()) {
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return "float " + ctx->FLITERAL()->getText();
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}
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return "";
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}
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std::any SysYIRGenerator::visitUnaryExp(SysYParser::UnaryExpContext* ctx) {
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if (ctx->unaryOp()) {
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std::string operand = std::any_cast<std::string>(ctx->unaryExp()->accept(this));
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std::string op = ctx->unaryOp()->getText();
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std::string temp = getNextTemp();
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if (op == "-") {
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irStream << " " << temp << " = sub " << getLLVMType("") << " 0, " << operand << "\n";
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} else if (op == "!") {
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irStream << " " << temp << " = xor " << getLLVMType("") << " " << operand << ", 1\n";
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}
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return temp;
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}
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return ctx->primaryExp()->accept(this);
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}
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std::any SysYIRGenerator::visitMulExp(SysYParser::MulExpContext* ctx) {
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auto unaryExps = ctx->unaryExp();
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std::string left = std::any_cast<std::string>(unaryExps[0]->accept(this));
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for (size_t i = 1; i < unaryExps.size(); ++i) {
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std::string right = std::any_cast<std::string>(unaryExps[i]->accept(this));
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std::string op = ctx->children[2 * i - 1]->getText();
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std::string temp = getNextTemp();
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if (op == "*") {
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irStream << " " << temp << " = mul " << getLLVMType("") << " " << left << ", " << right << "\n";
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} else if (op == "/") {
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irStream << " " << temp << " = sdiv " << getLLVMType("") << " " << left << ", " << right << "\n";
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} else if (op == "%") {
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irStream << " " << temp << " = srem " << getLLVMType("") << " " << left << ", " << right << "\n";
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}
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left = temp;
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}
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return left;
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}
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std::any SysYIRGenerator::visitAddExp(SysYParser::AddExpContext* ctx) {
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auto mulExps = ctx->mulExp();
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std::string left = std::any_cast<std::string>(mulExps[0]->accept(this));
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for (size_t i = 1; i < mulExps.size(); ++i) {
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std::string right = std::any_cast<std::string>(mulExps[i]->accept(this));
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std::string op = ctx->children[2 * i - 1]->getText();
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std::string temp = getNextTemp();
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if (op == "+") {
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irStream << " " << temp << " = add " << getLLVMType("") << " " << left << ", " << right << "\n";
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} else if (op == "-") {
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irStream << " " << temp << " = sub " << getLLVMType("") << " " << left << ", " << right << "\n";
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}
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left = temp;
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}
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return left;
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}
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std::any SysYIRGenerator::visitRelExp(SysYParser::RelExpContext* ctx) {
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auto addExps = ctx->addExp();
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std::string left = std::any_cast<std::string>(addExps[0]->accept(this));
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for (size_t i = 1; i < addExps.size(); ++i) {
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std::string right = std::any_cast<std::string>(addExps[i]->accept(this));
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std::string op = ctx->children[2 * i - 1]->getText();
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std::string temp = getNextTemp();
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if (op == "<") {
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irStream << " " << temp << " = icmp slt " << getLLVMType("") << " " << left << ", " << right << "\n";
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} else if (op == ">") {
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irStream << " " << temp << " = icmp sgt " << getLLVMType("") << " " << left << ", " << right << "\n";
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} else if (op == "<=") {
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irStream << " " << temp << " = icmp sle " << getLLVMType("") << " " << left << ", " << right << "\n";
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} else if (op == ">=") {
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irStream << " " << temp << " = icmp sge " << getLLVMType("") << " " << left << ", " << right << "\n";
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}
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left = temp;
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}
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return left;
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}
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std::any SysYIRGenerator::visitEqExp(SysYParser::EqExpContext* ctx) {
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auto relExps = ctx->relExp();
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std::string left = std::any_cast<std::string>(relExps[0]->accept(this));
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for (size_t i = 1; i < relExps.size(); ++i) {
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std::string right = std::any_cast<std::string>(relExps[i]->accept(this));
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std::string op = ctx->children[2 * i - 1]->getText();
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std::string temp = getNextTemp();
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if (op == "==") {
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irStream << " " << temp << " = icmp eq " << getLLVMType("") << " " << left << ", " << right << "\n";
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} else if (op == "!=") {
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irStream << " " << temp << " = icmp ne " << getLLVMType("") << " " << left << ", " << right << "\n";
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}
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left = temp;
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}
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return left;
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}
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std::any SysYIRGenerator::visitLAndExp(SysYParser::LAndExpContext* ctx) {
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auto eqExps = ctx->eqExp();
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std::string left = std::any_cast<std::string>(eqExps[0]->accept(this));
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for (size_t i = 1; i < eqExps.size(); ++i) {
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std::string right = std::any_cast<std::string>(eqExps[i]->accept(this));
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std::string temp = getNextTemp();
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irStream << " " << temp << " = and " << getLLVMType("") << " " << left << ", " << right << "\n";
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left = temp;
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}
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return left;
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}
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std::any SysYIRGenerator::visitLOrExp(SysYParser::LOrExpContext* ctx) {
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auto lAndExps = ctx->lAndExp();
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std::string left = std::any_cast<std::string>(lAndExps[0]->accept(this));
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for (size_t i = 1; i < lAndExps.size(); ++i) {
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std::string right = std::any_cast<std::string>(lAndExps[i]->accept(this));
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std::string temp = getNextTemp();
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irStream << " " << temp << " = or " << getLLVMType("") << " " << left << ", " << right << "\n";
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left = temp;
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}
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return left;
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} |