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[lab2] runnable

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This commit is contained in:
Lixuanwang
2025-03-10 16:50:18 +08:00
parent ac75f3fddd
commit b0b03ff55b
4 changed files with 288 additions and 64 deletions
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261
src/SysYIRGenerator.cpp
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@@ -1,30 +1,239 @@
#include "IR.h"
#include <any>
#include <memory>
using namespace std;
#include "SysYIRGenerator.h"
#include <iomanip>
namespace sysy {
any SysYIRGenerator::visitCompUnit(SysYParser::CompUnitContext *ctx) {
// create the IR module
auto pModule = new Module();
assert(pModule);
module.reset(pModule);
// generates globals and functions
visitChildren(ctx);
// return the IR module
return pModule;
}
std::any
SysYIRGenerator::visitFuncRParams(SysYParser::FuncRParamsContext *ctx) {
return visitChildren(ctx);
}
std::any SysYIRGenerator::visitNumber(SysYParser::NumberContext *ctx) {
return visitChildren(ctx);
}
std::any SysYIRGenerator::visitString(SysYParser::StringContext *ctx) {
return visitChildren(ctx);
std::string SysYIRGenerator::generateIR(SysYParser::CompUnitContext* unit) {
visitCompUnit(unit);
return irStream.str();
}
} // namespace sysy
std::string SysYIRGenerator::getNextTemp() {
return "%" + std::to_string(tempCounter++);
}
std::string SysYIRGenerator::getLLVMType(const std::string& type) {
if (type == "int") return "i32";
if (type == "float") return "float";
if (type.find("[]") != std::string::npos)
return getLLVMType(type.substr(0, type.size() - 2)) + "*";
return "i32";
}
std::any SysYIRGenerator::visitCompUnit(SysYParser::CompUnitContext* ctx) {
for (auto decl : ctx->decl()) {
decl->accept(this);
}
for (auto funcDef : ctx->funcDef()) {
funcDef->accept(this);
}
return nullptr;
}
std::any SysYIRGenerator::visitConstDecl(SysYParser::ConstDeclContext* ctx) {
// 常量声明暂不处理（LLVM IR 中常量通常内联）
return nullptr;
}
std::any SysYIRGenerator::visitVarDecl(SysYParser::VarDeclContext* ctx) {
for (auto varDef : ctx->varDef()) {
varDef->accept(this);
}
return nullptr;
}
std::any SysYIRGenerator::visitFuncDef(SysYParser::FuncDefContext* ctx) {
currentFunction = ctx->Ident()->getText();
symbolTable.clear();
// 函数头
std::string returnType = getLLVMType(ctx->funcType()->getText());
irStream << "define " << returnType << " @" << currentFunction << "(";
// 参数
auto paramsCtx = ctx->funcFParams();
if (paramsCtx) {
auto params = paramsCtx->funcFParam();
for (size_t i = 0; i < params.size(); ++i) {
if (i > 0) irStream << ", ";
auto param = params[i];
std::string paramName = "%" + std::to_string(i);
std::string paramType = getLLVMType(param->bType()->getText());
irStream << paramType << " " << paramName;
// 分配参数
std::string allocaName = getNextTemp();
symbolTable[param->Ident()->getText()] = allocaName;
irStream << "\n " << allocaName << " = alloca " << paramType;
irStream << "\n store " << paramType << " %" << i << ", " << paramType << "* " << allocaName;
}
}
irStream << ") {\nentry:\n";
// 函数体
ctx->blockStmt()->accept(this);
// 默认返回值
if (returnType == "void") {
irStream << " ret void\n";
} else {
irStream << " ret " << returnType << " 0\n";
}
irStream << "}\n\n";
return nullptr;
}
std::any SysYIRGenerator::visitBlockStmt(SysYParser::BlockStmtContext* ctx) {
for (auto item : ctx->blockItem()) {
item->accept(this);
}
return nullptr;
}
std::any SysYIRGenerator::visitStmt(SysYParser::StmtContext* ctx) {
if (ctx->lValue() && ctx->exp()) {
// 赋值语句
std::string lhs = std::any_cast<std::string>(ctx->lValue()->accept(this));
std::string rhs = std::any_cast<std::string>(ctx->exp()->accept(this));
irStream << " store " << getLLVMType("") << " " << rhs << ", " << getLLVMType("") << "* " << lhs << "\n";
} else if (ctx->RETURN()) {
// 返回语句
if (ctx->exp()) {
std::string value = std::any_cast<std::string>(ctx->exp()->accept(this));
irStream << " ret " << getLLVMType("") << " " << value << "\n";
} else {
irStream << " ret void\n";
}
}
return nullptr;
}
std::any SysYIRGenerator::visitLValue(SysYParser::LValueContext* ctx) {
std::string varName = ctx->Ident()->getText();
if (symbolTable.find(varName) == symbolTable.end()) {
std::string allocaName = getNextTemp();
symbolTable[varName] = allocaName;
irStream << " " << allocaName << " = alloca " << getLLVMType("") << "\n";
}
return symbolTable[varName];
}
std::any SysYIRGenerator::visitNumber(SysYParser::NumberContext* ctx) {
if (ctx->ILITERAL()) {
return "i32 " + ctx->ILITERAL()->getText();
} else if (ctx->FLITERAL()) {
return "float " + ctx->FLITERAL()->getText();
}
return "";
}
std::any SysYIRGenerator::visitUnaryExp(SysYParser::UnaryExpContext* ctx) {
if (ctx->unaryOp()) {
std::string operand = std::any_cast<std::string>(ctx->unaryExp()->accept(this));
std::string op = ctx->unaryOp()->getText();
std::string temp = getNextTemp();
if (op == "-") {
irStream << " " << temp << " = sub " << getLLVMType("") << " 0, " << operand << "\n";
} else if (op == "!") {
irStream << " " << temp << " = xor " << getLLVMType("") << " " << operand << ", 1\n";
}
return temp;
}
return ctx->primaryExp()->accept(this);
}
std::any SysYIRGenerator::visitMulExp(SysYParser::MulExpContext* ctx) {
auto unaryExps = ctx->unaryExp();
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();
if (op == "*") {
irStream << " " << temp << " = mul " << getLLVMType("") << " " << left << ", " << right << "\n";
} else if (op == "/") {
irStream << " " << temp << " = sdiv " << getLLVMType("") << " " << left << ", " << right << "\n";
} else if (op == "%") {
irStream << " " << temp << " = srem " << getLLVMType("") << " " << left << ", " << right << "\n";
}
left = temp;
}
return left;
}
std::any SysYIRGenerator::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();
if (op == "+") {
irStream << " " << temp << " = add " << getLLVMType("") << " " << left << ", " << right << "\n";
} else if (op == "-") {
irStream << " " << temp << " = sub " << getLLVMType("") << " " << left << ", " << right << "\n";
}
left = temp;
}
return left;
}
std::any SysYIRGenerator::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();
if (op == "<") {
irStream << " " << temp << " = icmp slt " << getLLVMType("") << " " << left << ", " << right << "\n";
} else if (op == ">") {
irStream << " " << temp << " = icmp sgt " << getLLVMType("") << " " << left << ", " << right << "\n";
} else if (op == "<=") {
irStream << " " << temp << " = icmp sle " << getLLVMType("") << " " << left << ", " << right << "\n";
} else if (op == ">=") {
irStream << " " << temp << " = icmp sge " << getLLVMType("") << " " << left << ", " << right << "\n";
}
left = temp;
}
return left;
}
std::any SysYIRGenerator::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();
if (op == "==") {
irStream << " " << temp << " = icmp eq " << getLLVMType("") << " " << left << ", " << right << "\n";
} else if (op == "!=") {
irStream << " " << temp << " = icmp ne " << getLLVMType("") << " " << left << ", " << right << "\n";
}
left = temp;
}
return left;
}
std::any SysYIRGenerator::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 right = std::any_cast<std::string>(eqExps[i]->accept(this));
std::string temp = getNextTemp();
irStream << " " << temp << " = and " << getLLVMType("") << " " << left << ", " << right << "\n";
left = temp;
}
return left;
}
std::any SysYIRGenerator::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 right = std::any_cast<std::string>(lAndExps[i]->accept(this));
std::string temp = getNextTemp();
irStream << " " << temp << " = or " << getLLVMType("") << " " << left << ", " << right << "\n";
left = temp;
}
return left;
}