forked from ppxf25tqu/nudt-compiler-cpp
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73 lines
1.6 KiB
73 lines
1.6 KiB
// 简单 AST 调试打印，便于前端验证。
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#include "ast/AstNodes.h"
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#include <iostream>
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namespace ast {
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static void PrintExpr(const Expr* expr);
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static void PrintIndent(int depth) {
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for (int i = 0; i < depth; ++i) std::cout << " ";
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}
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static void PrintExpr(const Expr* expr) {
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if (auto num = dynamic_cast<const NumberExpr*>(expr)) {
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std::cout << num->value;
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} else if (auto var = dynamic_cast<const VarExpr*>(expr)) {
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std::cout << var->name;
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} else if (auto bin = dynamic_cast<const BinaryExpr*>(expr)) {
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std::cout << "(";
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PrintExpr(bin->lhs.get());
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const char* op = "?";
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switch (bin->op) {
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case BinaryOp::Add:
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op = "+";
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break;
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case BinaryOp::Sub:
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op = "-";
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break;
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case BinaryOp::Mul:
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op = "*";
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break;
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case BinaryOp::Div:
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op = "/";
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break;
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}
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std::cout << " " << op << " ";
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PrintExpr(bin->rhs.get());
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std::cout << ")";
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}
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}
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void PrintAST(const CompUnit& cu) {
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if (!cu.func) return;
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std::cout << "func " << cu.func->name << " () {\n";
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const auto& body = cu.func->body;
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if (!body) {
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std::cout << "}\n";
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return;
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}
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for (const auto& decl : body->varDecls) {
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PrintIndent(1);
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std::cout << "var " << decl->name;
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if (decl->init) {
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std::cout << " = ";
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PrintExpr(decl->init.get());
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}
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std::cout << ";\n";
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}
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for (const auto& stmt : body->stmts) {
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if (auto ret = dynamic_cast<ReturnStmt*>(stmt.get())) {
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PrintIndent(1);
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std::cout << "return ";
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PrintExpr(ret->value.get());
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std::cout << ";\n";
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}
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}
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std::cout << "}\n";
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}
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} // namespace ast
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