Fully abstract backend interface.

git-svn-id: http://svn.drobilla.net/resp/tuplr@197 ad02d1e2-f140-0410-9f75-f8b11f17cedd

1 files changed, 26 insertions, 17 deletions

diff --git a/src/tuplr.cpp b/src/tuplr.cpp
index f8cc246..481885c 100644
--- a/src/tuplr.cpp
+++ b/src/tuplr.cpp
@@ -48,16 +48,7 @@ print_usage(char* name, bool error)
 int
 main(int argc, char** argv)
 {
-	PEnv penv;
-	TEnv tenv(penv);
-	initLang(penv, tenv);
-
-	Engine* engine = tuplr_new_engine();
-	CEnv*   cenv   = new CEnv(penv, tenv, engine);
-
-	cenv->push();
-	Object::pool.lock();
-
+	// Read command line arguments
 	map<string,string> args;
 	list<string>       files;
 	for (int i = 1; i < argc; ++i) {
@@ -78,17 +69,35 @@ main(int argc, char** argv)
 		}
 	}
 
+	PEnv penv;
+	TEnv tenv(penv);
+	initLang(penv, tenv);
+
+	Engine* engine = NULL;
+
+	map<string,string>::const_iterator a = args.find("-b");
+	const string backend_name = (a != args.end() ? a->second : "llvm");
+
+	if (backend_name == "llvm")
+		engine = tuplr_new_llvm_engine();
+
+	if (!engine) {
+		std::cerr << "Unable to open backend " << backend_name << std::endl;
+		return 1;
+	}
+
+	CEnv* cenv = new CEnv(penv, tenv, engine);
 	cenv->args = args;
+	cenv->push();
+
+	Object::pool.lock();
 
 	int ret = 0;
 
-	string output;
-	map<string,string>::const_iterator a = args.find("-o");
-	if (a != args.end())
-		output = a->second;
+	a = args.find("-o");
+	const string output = (a != args.end()) ? a->second : "";
 
-	a = args.find("-p");
-	if (a != args.end()) {
+	if (args.find("-p") != args.end()) {
 		ifstream is(files.front().c_str());
 		if (is.good()) {
 			Cursor loc;
@@ -131,7 +140,7 @@ main(int argc, char** argv)
 	}
 
 	delete cenv;
-	tuplr_free_engine(engine);
+	delete engine;
 
 	return ret;
 }