566 lines
22 KiB
C++
566 lines
22 KiB
C++
// LLVMIRGenerator.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 "LLVMIRGenerator.h"
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#include <iomanip>
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std::string LLVMIRGenerator::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 LLVMIRGenerator::getNextTemp() {
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std::string ret = "%." + std::to_string(tempCounter++);
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tmpTable[ret] = "void";
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return ret;
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}
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std::string LLVMIRGenerator::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 LLVMIRGenerator::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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inFunction = true; // 进入函数定义
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funcDef->accept(this);
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inFunction = false; // 离开函数定义
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}
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return nullptr;
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}
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std::any LLVMIRGenerator::visitVarDecl(SysYParser::VarDeclContext* ctx) {
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// TODO：数组初始化
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std::string type = ctx->bType()->getText();
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currentVarType = getLLVMType(type);
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for (auto varDef : ctx->varDef()) {
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if (!inFunction) {
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// 全局变量声明
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std::string varName = varDef->Ident()->getText();
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std::string llvmType = getLLVMType(type);
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std::string value = "0"; // 默认值为 0
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if (varDef->ASSIGN()) {
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value = std::any_cast<std::string>(varDef->initVal()->accept(this));
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}
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irStream << "@" << varName << " = dso_local global " << llvmType << " " << value << ", align 4\n";
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globalVars.push_back(varName); // 记录全局变量
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} else {
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// 局部变量声明
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varDef->accept(this);
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}
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}
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return nullptr;
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}
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std::any LLVMIRGenerator::visitConstDecl(SysYParser::ConstDeclContext* ctx) {
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// TODO：数组初始化
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std::string type = ctx->bType()->getText();
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for (auto constDef : ctx->constDef()) {
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if (!inFunction) {
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// 全局常量声明
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std::string varName = constDef->Ident()->getText();
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std::string llvmType = getLLVMType(type);
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std::string value = "0"; // 默认值为 0
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try {
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value = std::any_cast<std::string>(constDef->constInitVal()->accept(this));
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} catch (...) {
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throw std::runtime_error("Const value must be initialized upon definition.");
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}
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if (llvmType == "float") {
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try {
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double floatValue = std::stod(value);
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uint64_t hexValue = reinterpret_cast<uint64_t&>(floatValue);
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std::stringstream ss;
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ss << "0x" << std::hex << std::uppercase << hexValue;
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value = ss.str();
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} catch (...) {
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throw std::runtime_error("Invalid float literal: " + value);
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}
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}
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irStream << "@" << varName << " = dso_local constant " << llvmType << " " << value << ", align 4\n";
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globalVars.push_back(varName); // 记录全局变量
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} else {
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// 局部常量声明
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std::string varName = constDef->Ident()->getText();
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std::string llvmType = getLLVMType(type);
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std::string allocaName = getNextTemp();
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std::string value = "0"; // 默认值为 0
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try {
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value = std::any_cast<std::string>(constDef->constInitVal()->accept(this));
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} catch (...) {
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throw std::runtime_error("Const value must be initialized upon definition.");
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}
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irStream << " " << allocaName << " = alloca " << llvmType << ", align 4\n";
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if (llvmType == "float") {
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try {
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double floatValue = std::stod(value);
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uint64_t hexValue = reinterpret_cast<uint64_t&>(floatValue);
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std::stringstream ss;
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ss << "0x" << std::hex << std::uppercase << hexValue;
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value = ss.str();
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} catch (...) {
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throw std::runtime_error("Invalid float literal: " + value);
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}
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}
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irStream << " store " << llvmType << " " << value << ", " << llvmType
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<< "* " << allocaName << ", align 4\n";
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symbolTable[varName] = {allocaName, llvmType};
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tmpTable[allocaName] = llvmType;
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}
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}
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return nullptr;
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}
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std::any LLVMIRGenerator::visitVarDef(SysYParser::VarDefContext* ctx) {
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// TODO：数组初始化
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std::string varName = ctx->Ident()->getText();
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std::string type = currentVarType;
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std::string llvmType = getLLVMType(type);
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std::string allocaName = getNextTemp();
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irStream << " " << allocaName << " = alloca " << llvmType << ", align 4\n";
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if (ctx->ASSIGN()) {
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std::string value = std::any_cast<std::string>(ctx->initVal()->accept(this));
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if (llvmType == "float") {
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try {
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double floatValue = std::stod(value);
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uint64_t hexValue = reinterpret_cast<uint64_t&>(floatValue);
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std::stringstream ss;
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ss << "0x" << std::hex << std::uppercase << (hexValue & (0xffffffffUL << 32));
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value = ss.str();
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} catch (...) {
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throw std::runtime_error("Invalid float literal: " + value);
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}
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}
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irStream << " store " << llvmType << " " << value << ", " << llvmType
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<< "* " << allocaName << ", align 4\n";
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}
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symbolTable[varName] = {allocaName, llvmType};
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tmpTable[allocaName] = llvmType;
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return nullptr;
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}
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std::any LLVMIRGenerator::visitFuncDef(SysYParser::FuncDefContext* ctx) {
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currentFunction = ctx->Ident()->getText();
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currentReturnType = getLLVMType(ctx->funcType()->getText());
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symbolTable.clear();
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tmpTable.clear();
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tempCounter = 0;
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hasReturn = false;
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irStream << "define dso_local " << currentReturnType << " @" << currentFunction << "(";
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if (ctx->funcFParams()) {
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auto params = ctx->funcFParams()->funcFParam();
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tempCounter += params.size();
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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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std::string paramType = getLLVMType(params[i]->bType()->getText());
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irStream << paramType << " noundef %" << i;
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symbolTable[params[i]->Ident()->getText()] = {"%" + std::to_string(i), paramType};
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tmpTable["%" + std::to_string(i)] = paramType;
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}
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}
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tempCounter++;
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irStream << ") #0 {\n";
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if (ctx->funcFParams()) {
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auto params = ctx->funcFParams()->funcFParam();
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for (size_t i = 0; i < params.size(); ++i) {
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std::string varName = params[i]->Ident()->getText();
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std::string type = params[i]->bType()->getText();
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std::string llvmType = getLLVMType(type);
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std::string allocaName = getNextTemp();
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tmpTable[allocaName] = llvmType;
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irStream << " " << allocaName << " = alloca " << llvmType << ", align 4\n";
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irStream << " store " << llvmType << " " << symbolTable[varName].first << ", " << llvmType
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<< "* " << allocaName << ", align 4\n";
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symbolTable[varName] = {allocaName, llvmType};
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}
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}
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ctx->blockStmt()->accept(this);
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if (!hasReturn) {
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if (currentReturnType == "void") {
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irStream << " ret void\n";
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} else {
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irStream << " ret " << currentReturnType << " 0\n";
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}
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}
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irStream << "}\n";
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return nullptr;
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}
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std::any LLVMIRGenerator::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 visitAssignStmt(SysYParser::AssignStmtContext *ctx)
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{
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std::string lhsAlloca = std::any_cast<std::string>(ctx->lValue()->accept(this));
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std::string lhsType = symbolTable[ctx->lValue()->Ident()->getText()].second;
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std::string rhs = std::any_cast<std::string>(ctx->exp()->accept(this));
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if (lhsType == "float") {
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try {
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double floatValue = std::stod(rhs);
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uint64_t hexValue = reinterpret_cast<uint64_t&>(floatValue);
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std::stringstream ss;
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ss << "0x" << std::hex << std::uppercase << (hexValue & (0xffffffffUL << 32));
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rhs = ss.str();
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} catch (...) {
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throw std::runtime_error("Invalid float literal: " + rhs);
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}
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}
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irStream << " store " << lhsType << " " << rhs << ", " << lhsType
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<< "* " << lhsAlloca << ", align 4\n";
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return nullptr;
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}
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std::any visitIfStmt(SysYParser::IfStmtContext *ctx)
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{
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std::string cond = std::any_cast<std::string>(ctx->cond()->accept(this));
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std::string trueLabel = "if.then." + std::to_string(tempCounter);
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std::string falseLabel = "if.else." + std::to_string(tempCounter);
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std::string mergeLabel = "if.end." + std::to_string(tempCounter++);
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irStream << " br i1 " << cond << ", label %" << trueLabel << ", label %" << falseLabel << "\n";
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irStream << trueLabel << ":\n";
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ctx->stmt(0)->accept(this);
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irStream << " br label %" << mergeLabel << "\n";
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irStream << falseLabel << ":\n";
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if (ctx->ELSE()) {
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ctx->stmt(1)->accept(this);
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}
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irStream << " br label %" << mergeLabel << "\n";
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irStream << mergeLabel << ":\n";
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return nullptr;
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}
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std::any visitWhileStmt(SysYParser::WhileStmtContext *ctx)
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{
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std::string loop_cond = "while.cond." + std::to_string(tempCounter);
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std::string loop_body = "while.body." + std::to_string(tempCounter);
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std::string loop_end = "while.end." + std::to_string(tempCounter++);
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loopStack.push({loop_end, loop_cond});
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irStream << " br label %" << loop_cond << "\n";
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irStream << loop_cond << ":\n";
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std::string cond = std::any_cast<std::string>(ctx->cond()->accept(this));
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irStream << " br i1 " << cond << ", label %" << loop_body << ", label %" << loop_end << "\n";
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irStream << loop_body << ":\n";
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ctx->stmt(0)->accept(this);
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irStream << " br label %" << loop_cond << "\n";
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irStream << loop_end << ":\n";
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loopStack.pop();
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return nullptr;
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}
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std::any visitBreakStmt(SysYParser::BreakStmtContext *ctx)
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{
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if (loopStack.empty()) {
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throw std::runtime_error("Break statement outside of a loop.");
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}
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irStream << " br label %" << loopStack.top().breakLabel << "\n";
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return nullptr;
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}
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std::any visitContinueStmt(SysYParser::ContinueStmtContext *ctx)
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{
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if (loopStack.empty()) {
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throw std::runtime_error("Continue statement outside of a loop.");
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}
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irStream << " br label %" << loopStack.top().continueLabel << "\n";
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return nullptr;
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}
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// std::any LLVMIRGenerator::visitStmt(SysYParser::StmtContext* ctx) {
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// if (ctx->lValue() && ctx->ASSIGN()) {
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// std::string lhsAlloca = std::any_cast<std::string>(ctx->lValue()->accept(this));
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// std::string lhsType = symbolTable[ctx->lValue()->Ident()->getText()].second;
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// std::string rhs = std::any_cast<std::string>(ctx->exp()->accept(this));
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// if (lhsType == "float") {
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// try {
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// double floatValue = std::stod(rhs);
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// uint64_t hexValue = reinterpret_cast<uint64_t&>(floatValue);
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// std::stringstream ss;
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// ss << "0x" << std::hex << std::uppercase << (hexValue & (0xffffffffUL << 32));
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// rhs = ss.str();
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// } catch (...) {
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// throw std::runtime_error("Invalid float literal: " + rhs);
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// }
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// }
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// irStream << " store " << lhsType << " " << rhs << ", " << lhsType
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// << "* " << lhsAlloca << ", align 4\n";
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// } else if (ctx->RETURN()) {
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// hasReturn = true;
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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 " << currentReturnType << " " << value << "\n";
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// } else {
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// irStream << " ret void\n";
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// }
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// } else if (ctx->IF()) {
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// std::string cond = std::any_cast<std::string>(ctx->cond()->accept(this));
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// std::string trueLabel = "if.then." + std::to_string(tempCounter);
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// std::string falseLabel = "if.else." + std::to_string(tempCounter);
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// std::string mergeLabel = "if.end." + std::to_string(tempCounter++);
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// irStream << " br i1 " << cond << ", label %" << trueLabel << ", label %" << falseLabel << "\n";
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// irStream << trueLabel << ":\n";
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// ctx->stmt(0)->accept(this);
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// irStream << " br label %" << mergeLabel << "\n";
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// irStream << falseLabel << ":\n";
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// if (ctx->ELSE()) {
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// ctx->stmt(1)->accept(this);
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// }
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// irStream << " br label %" << mergeLabel << "\n";
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// irStream << mergeLabel << ":\n";
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// } else if (ctx->WHILE()) {
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// std::string loop_cond = "while.cond." + std::to_string(tempCounter);
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// std::string loop_body = "while.body." + std::to_string(tempCounter);
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// std::string loop_end = "while.end." + std::to_string(tempCounter++);
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// loopStack.push({loop_end, loop_cond});
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// irStream << " br label %" << loop_cond << "\n";
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// irStream << loop_cond << ":\n";
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// std::string cond = std::any_cast<std::string>(ctx->cond()->accept(this));
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// irStream << " br i1 " << cond << ", label %" << loop_body << ", label %" << loop_end << "\n";
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// irStream << loop_body << ":\n";
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// ctx->stmt(0)->accept(this);
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// irStream << " br label %" << loop_cond << "\n";
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// irStream << loop_end << ":\n";
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// loopStack.pop();
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// } else if (ctx->BREAK()) {
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// if (loopStack.empty()) {
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// throw std::runtime_error("Break statement outside of a loop.");
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// }
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// irStream << " br label %" << loopStack.top().breakLabel << "\n";
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// } else if (ctx->CONTINUE()) {
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// if (loopStack.empty()) {
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// throw std::runtime_error("Continue statement outside of a loop.");
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// }
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// irStream << " br label %" << loopStack.top().continueLabel << "\n";
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// } else if (ctx->blockStmt()) {
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// ctx->blockStmt()->accept(this);
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// } else if (ctx->exp()) {
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// ctx->exp()->accept(this);
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// }
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// return nullptr;
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// }
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std::any LLVMIRGenerator::visitLValue(SysYParser::LValueContext* ctx) {
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std::string varName = ctx->Ident()->getText();
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return symbolTable[varName].first;
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}
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std::any LLVMIRGenerator::visitPrimaryExp(SysYParser::PrimaryExpContext* ctx) {
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if (ctx->lValue()) {
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std::string allocaPtr = std::any_cast<std::string>(ctx->lValue()->accept(this));
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std::string varName = ctx->lValue()->Ident()->getText();
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std::string type = symbolTable[varName].second;
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std::string temp = getNextTemp();
|
||
irStream << " " << temp << " = load " << type << ", " << type << "* " << allocaPtr << ", align 4\n";
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tmpTable[temp] = type;
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return temp;
|
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} else if (ctx->exp()) {
|
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return ctx->exp()->accept(this);
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} else {
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||
return ctx->number()->accept(this);
|
||
}
|
||
}
|
||
|
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std::any LLVMIRGenerator::visitNumber(SysYParser::NumberContext* ctx) {
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if (ctx->ILITERAL()) {
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return ctx->ILITERAL()->getText();
|
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} else if (ctx->FLITERAL()) {
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return ctx->FLITERAL()->getText();
|
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}
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return "";
|
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}
|
||
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||
std::any LLVMIRGenerator::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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std::string type = operand.substr(0, operand.find(' '));
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tmpTable[temp] = type;
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if (op == "-") {
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irStream << " " << temp << " = sub " << type << " 0, " << operand << "\n";
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} else if (op == "!") {
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irStream << " " << temp << " = xor " << type << " " << operand << ", 1\n";
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}
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return temp;
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||
} else if (ctx->Ident()) {
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||
std::string funcName = ctx->Ident()->getText();
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||
std::vector<std::string> args;
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||
if (ctx->funcRParams()) {
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||
for (auto argCtx : ctx->funcRParams()->exp()) {
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||
args.push_back(std::any_cast<std::string>(argCtx->accept(this)));
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}
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||
}
|
||
std::string temp = getNextTemp();
|
||
std::string argList = "";
|
||
for (size_t i = 0; i < args.size(); ++i) {
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||
if (i > 0) argList += ", ";
|
||
argList +=tmpTable[args[i]] + " noundef " + args[i];
|
||
}
|
||
irStream << " " << temp << " = call " << currentReturnType << " @" << funcName << "(" << argList << ")\n";
|
||
tmpTable[temp] = currentReturnType;
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return temp;
|
||
}
|
||
return ctx->primaryExp()->accept(this);
|
||
}
|
||
|
||
std::any LLVMIRGenerator::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));
|
||
for (size_t i = 1; i < unaryExps.size(); ++i) {
|
||
std::string right = std::any_cast<std::string>(unaryExps[i]->accept(this));
|
||
std::string op = ctx->children[2*i-1]->getText();
|
||
std::string temp = getNextTemp();
|
||
std::string type = tmpTable[left];
|
||
if (op == "*") {
|
||
irStream << " " << temp << " = mul nsw " << type << " " << left << ", " << right << "\n";
|
||
} else if (op == "/") {
|
||
irStream << " " << temp << " = sdiv " << type << " " << left << ", " << right << "\n";
|
||
} else if (op == "%") {
|
||
irStream << " " << temp << " = srem " << type << " " << left << ", " << right << "\n";
|
||
}
|
||
left = temp;
|
||
tmpTable[temp] = type;
|
||
}
|
||
return left;
|
||
}
|
||
|
||
std::any LLVMIRGenerator::visitAddExp(SysYParser::AddExpContext* ctx) {
|
||
auto mulExps = ctx->mulExp();
|
||
std::string left = std::any_cast<std::string>(mulExps[0]->accept(this));
|
||
for (size_t i = 1; i < mulExps.size(); ++i) {
|
||
std::string right = std::any_cast<std::string>(mulExps[i]->accept(this));
|
||
std::string op = ctx->children[2*i-1]->getText();
|
||
std::string temp = getNextTemp();
|
||
std::string type = tmpTable[left];
|
||
if (op == "+") {
|
||
irStream << " " << temp << " = add nsw " << type << " " << left << ", " << right << "\n";
|
||
} else if (op == "-") {
|
||
irStream << " " << temp << " = sub nsw " << type << " " << left << ", " << right << "\n";
|
||
}
|
||
left = temp;
|
||
tmpTable[temp] = type;
|
||
}
|
||
return left;
|
||
}
|
||
|
||
std::any LLVMIRGenerator::visitRelExp(SysYParser::RelExpContext* ctx) {
|
||
auto addExps = ctx->addExp();
|
||
std::string left = std::any_cast<std::string>(addExps[0]->accept(this));
|
||
for (size_t i = 1; i < addExps.size(); ++i) {
|
||
std::string right = std::any_cast<std::string>(addExps[i]->accept(this));
|
||
std::string op = ctx->children[2*i-1]->getText();
|
||
std::string temp = getNextTemp();
|
||
std::string type = tmpTable[left];
|
||
if (op == "<") {
|
||
irStream << " " << temp << " = icmp slt " << type << " " << left << ", " << right << "\n";
|
||
} else if (op == ">") {
|
||
irStream << " " << temp << " = icmp sgt " << type << " " << left << ", " << right << "\n";
|
||
} else if (op == "<=") {
|
||
irStream << " " << temp << " = icmp sle " << type << " " << left << ", " << right << "\n";
|
||
} else if (op == ">=") {
|
||
irStream << " " << temp << " = icmp sge " << type << " " << left << ", " << right << "\n";
|
||
}
|
||
left = temp;
|
||
}
|
||
return left;
|
||
}
|
||
|
||
std::any LLVMIRGenerator::visitEqExp(SysYParser::EqExpContext* ctx) {
|
||
auto relExps = ctx->relExp();
|
||
std::string left = std::any_cast<std::string>(relExps[0]->accept(this));
|
||
for (size_t i = 1; i < relExps.size(); ++i) {
|
||
std::string right = std::any_cast<std::string>(relExps[i]->accept(this));
|
||
std::string op = ctx->children[2*i-1]->getText();
|
||
std::string temp = getNextTemp();
|
||
std::string type = tmpTable[left];
|
||
if (op == "==") {
|
||
irStream << " " << temp << " = icmp eq " << type << " " << left << ", " << right << "\n";
|
||
} else if (op == "!=") {
|
||
irStream << " " << temp << " = icmp ne " << type << " " << left << ", " << right << "\n";
|
||
}
|
||
left = temp;
|
||
}
|
||
return left;
|
||
}
|
||
|
||
std::any LLVMIRGenerator::visitLAndExp(SysYParser::LAndExpContext* ctx) {
|
||
auto eqExps = ctx->eqExp();
|
||
std::string left = std::any_cast<std::string>(eqExps[0]->accept(this));
|
||
for (size_t i = 1; i < eqExps.size(); ++i) {
|
||
std::string falseLabel = "land.false." + std::to_string(tempCounter);
|
||
std::string endLabel = "land.end." + std::to_string(tempCounter++);
|
||
std::string temp = getNextTemp();
|
||
|
||
irStream << " br label %" << falseLabel << "\n";
|
||
irStream << falseLabel << ":\n";
|
||
std::string right = std::any_cast<std::string>(eqExps[i]->accept(this));
|
||
irStream << " " << temp << " = and i1 " << left << ", " << right << "\n";
|
||
irStream << " br label %" << endLabel << "\n";
|
||
irStream << endLabel << ":\n";
|
||
left = temp;
|
||
}
|
||
return left;
|
||
}
|
||
|
||
std::any LLVMIRGenerator::visitLOrExp(SysYParser::LOrExpContext* ctx) {
|
||
auto lAndExps = ctx->lAndExp();
|
||
std::string left = std::any_cast<std::string>(lAndExps[0]->accept(this));
|
||
for (size_t i = 1; i < lAndExps.size(); ++i) {
|
||
std::string trueLabel = "lor.true." + std::to_string(tempCounter);
|
||
std::string endLabel = "lor.end." + std::to_string(tempCounter++);
|
||
std::string temp = getNextTemp();
|
||
|
||
irStream << " br label %" << trueLabel << "\n";
|
||
irStream << trueLabel << ":\n";
|
||
std::string right = std::any_cast<std::string>(lAndExps[i]->accept(this));
|
||
irStream << " " << temp << " = or i1 " << left << ", " << right << "\n";
|
||
irStream << " br label %" << endLabel << "\n";
|
||
irStream << endLabel << ":\n";
|
||
left = temp;
|
||
}
|
||
return left;
|
||
} |