Add the function counter

src/CMakeLists.txt

@@ -23,3 +23,11 @@ add_executable(pisn
 target_link_libraries(pisn
     kyut
 )
+
+add_executable(funccnt
+    funccnt.cpp
+)
+
+target_link_libraries(funccnt
+    kyut
+)

src/funccnt.cpp

+#include <algorithm>
+
+#include <fmt/printf.h>
+
+#include <wasm-io.h>
+
+int main(int argc, char *argv[]) {
+    // Parse command line options
+    if (argc != 2) {
+        fmt::print(std::cerr, "{} <input file>\n", argv[0]);
+
+        return 1;
+    }
+
+    const std::string inputFile = argv[1];
+
+    try {
+        // Read the input module
+        wasm::Module module;
+        wasm::ModuleReader{}.read(inputFile, module);
+
+        const auto count = std::count_if(
+            std::begin(module.functions), std::end(module.functions), [](const auto &f) { return f->body != nullptr; });
+
+        fmt::print("{}\n", count);
+    } catch (const wasm::ParseException &e) {
+        e.dump(std::cerr);
+
+        return 1;
+    } catch (const std::exception &e) {
+        fmt::print(std::cerr, "exception: {}\n", e.what());
+
+        return 1;
+    } catch (...) {
+        fmt::print(std::cerr, "unknown exception\n");
+
+        return 1;
+    }
+}