Produce LLVM IR and object file

.gitignore

@@ -1 +1,2 @@
-build
+build
+test.o

src/main.cpp

@@ -41,15 +41,28 @@ std::string read_file(std::string& filepath) {
     return out;
 }
 
-int main() {
+int write_file(std::string& filepath, std::string& content) {
+    std::ofstream output{ filepath };
+    if (!output) {
+        std::cerr << "Failed to open " << filepath << " for reading" << std::endl;
+        return 1;
+    }
 
-    std::string filename{ "test.c" };
+    output << content << std::endl;
+    return 0;
+}
 
-    std::string out{ read_file(filename) };
+struct CompileOutput {
+    std::string llvm_ir_string;
+    std::string obj_string;
+};
+
+std::optional<CompileOutput> compile(std::string& in_filename) {
+    std::string out{ read_file(in_filename) };
 
     std::cout << out << std::endl;
 
-    auto tokens = token::tokenize(out, filename);
+    auto tokens = token::tokenize(out, in_filename);
     for (token::Token token : tokens) {
         std::cout << token << std::endl;
     }
@@ -64,7 +77,7 @@ int main() {
     }
     if (stream.peek().type != token::Type::Eof) {
         std::cerr << statement.unwrap_err() << std::endl;
-        return 1;
+        return {};
     }
     stream.expect(token::Type::Eof);
 
@@ -92,7 +105,7 @@ int main() {
         std::cerr << "FATAL: " << error.what() << std::endl;
         std::cerr << "   at " << error.m_meta.start.line + 1 << ":" << error.m_meta.start.col + 1;
         std::cerr << " to " << error.m_meta.end.line + 1 << ":" << error.m_meta.end.col + 1 << std::endl;
-        return 1;
+        return {};
     }
 
     llvm::InitializeAllTargetInfos();
@@ -110,15 +123,47 @@ int main() {
     builder.mod->setDataLayout(TargetMachine->createDataLayout());
     builder.mod->setTargetTriple(TargetMachine->getTargetTriple());
 
-    std::string ir_output;
+    std::string llvm_ir_string;
-    llvm::raw_string_ostream dest{ ir_output };
+    llvm::raw_string_ostream llvm_ir_dest{ llvm_ir_string };
 
-    builder.mod->print(dest, nullptr);
+    builder.mod->print(llvm_ir_dest, nullptr);
-    dest.flush();
+    llvm_ir_dest.flush();
 
-    std::cout << ir_output << std::endl;
+    std::error_code EC;
+    std::string obj_string;
+    llvm::raw_string_ostream obj_stream{ obj_string };
+    llvm::buffer_ostream obj_dest{ obj_stream };
 
-    std::cout << "hello" << std::endl;
+    if (EC) {
+        llvm::errs() << "Unable to open file (" << EC.message() << ")";
+        return {};
+    }
+
+    llvm::legacy::PassManager pass{};
+    if (TargetMachine->addPassesToEmitFile(pass, obj_dest, nullptr, llvm::CodeGenFileType::ObjectFile)) {
+        llvm::errs() << "Target Machine can't emit file";
+        return {};
+    }
+
+    pass.run(*builder.mod);
+    obj_string = (std::string_view)obj_dest.str();
+
+    return CompileOutput{
+        llvm_ir_string,
+        obj_string,
+    };
+}
+
+int main() {
+
+    std::string in_filename{ "test.c" };
+    std::string out_filename{ "test.o" };
+
+    auto out = compile(in_filename);
+    if (out) {
+        std::cout << out->llvm_ir_string << std::endl;
+        write_file(out_filename, out->obj_string);
+    }
 
     return 0;
 }