Added new compilation phase and test

src/test/run-make/llvm-phase/Makefile

@@ -0,0 +1,5 @@
+-include ../tools.mk
+
+all:
+	$(RUSTC) test.rs
+	$(call RUN,test $(RUSTC))

src/test/run-make/llvm-phase/test.rs

@@ -0,0 +1,82 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(plugin, rustc_private, box_syntax)]
+
+extern crate rustc;
+extern crate rustc_driver;
+extern crate rustc_llvm;
+#[macro_use] extern crate syntax;
+extern crate getopts;
+
+use rustc_driver::{CompilerCalls, Compilation};
+use rustc_driver::driver::CompileController;
+use rustc::session::Session;
+use syntax::codemap::FileLoader;
+use std::io;
+use std::path::{PathBuf, Path};
+
+struct JitLoader;
+
+impl FileLoader for JitLoader {
+    fn file_exists(&self, _: &Path) -> bool { true }
+    fn abs_path(&self, _: &Path) -> Option<PathBuf> { None }
+    fn read_file(&self, _: &Path) -> io::Result<String> {
+        Ok(r#"
+#[no_mangle]
+pub fn test_add(a: i32, b: i32) -> i32 { a + b }
+"#.to_string())
+    }
+}
+
+#[derive(Copy, Clone)]
+struct JitCalls;
+
+impl<'a> CompilerCalls<'a> for JitCalls {
+    fn build_controller(&mut self,
+                        _: &Session,
+                        _: &getopts::Matches)
+                        -> CompileController<'a> {
+        let mut cc = CompileController::basic();
+        cc.after_llvm.stop = Compilation::Stop;
+        cc.after_llvm.run_callback_on_error = true;
+        cc.after_llvm.callback = Box::new(|state| {
+            state.session.abort_if_errors();
+            let trans = state.trans.unwrap();
+            assert_eq!(trans.modules.len(), 1);
+            let rs_llmod = trans.modules[0].llmod;
+            unsafe { rustc_llvm::LLVMDumpModule(rs_llmod) };
+        });
+        cc
+    }
+}
+
+fn main() {
+    use rustc_driver;
+
+    let mut path = match std::env::args().nth(2) {
+        Some(path) => PathBuf::from(&path),
+        None => panic!("missing rustc path")
+    };
+
+    // Remove two segments from rustc path to get sysroot.
+    path.pop();
+    path.pop();
+
+    let args: Vec<String> =
+        format!("_ _ --sysroot {} --crate-type dylib", path.to_str().unwrap())
+        .split(' ').map(|s| s.to_string()).collect();
+
+    let (result, _) = rustc_driver::run_compiler_with_file_loader(
+        &args, &mut JitCalls, box JitLoader);
+    if let Err(n) = result {
+        panic!("Error {}", n);
+    }
+}