Implement basic IR generator

Signed-off-by: CHatingPython <chatingpython@gmail.com>

furc/src/main.cpp

@@ -1,14 +1,34 @@
-#ifndef LIBFURC
+// #ifndef LIBFURC
 
+#include "furc/front/ir_generator.hpp"
 #include "furc/front/parser.hpp"
 
 #include <iostream>
 
 int main(void) {
-    furc::front::parser parser("<TEMP>", "func main() {\n    return x = y;\n}");
-    std::cout << parser.parse() << '\n';
+    furc::front::parser       parser("<TEMP>", "func main() {\n    return 7 + 6 * 10;\n}");
+    furc::front::ir_generator generator;
+
+    auto program = parser.parse();
+    if (program.has_error()) {
+        std::cerr << program << '\n';
+    }
+    program->accept(generator);
+
+    auto module = std::move(generator.move_module());
+    std::cout << "Generated IR:\n";
+    for (const auto& function : module.functions()) {
+        std::cout << function->name() << ":\n";
+        furlang::ir::block_index blockIndex = 0;
+        for (const auto& block : function->blocks()) {
+            std::cout << "  # block " << blockIndex++ << '\n';
+            for (const auto& instruction : block->instructions()) {
+                std::cout << "  " << *instruction << '\n';
+            }
+        }
+    }
 
     return 0;
 }
 
-#endif // LIBFURC
+// #endif // LIBFURC