Actually make rustc_driver compile without llvm

src/librustc_driver/Cargo.toml

@@ -30,6 +30,7 @@ rustc_privacy = { path = "../librustc_privacy" }
 rustc_resolve = { path = "../librustc_resolve" }
 rustc_save_analysis = { path = "../librustc_save_analysis" }
 rustc_trans = { path = "../librustc_trans", optional = true }
+rustc_trans_utils = { path = "../librustc_trans_utils" }
 rustc_typeck = { path = "../librustc_typeck" }
 serialize = { path = "../libserialize" }
 syntax = { path = "../libsyntax" }

src/librustc_driver/driver.rs

@@ -31,7 +31,9 @@ use rustc_incremental::{self, IncrementalHashesMap};
 use rustc_resolve::{MakeGlobMap, Resolver};
 use rustc_metadata::creader::CrateLoader;
 use rustc_metadata::cstore::{self, CStore};
+#[cfg(feature="llvm")]
 use rustc_trans::back::{link, write};
+#[cfg(feature="llvm")]
 use rustc_trans as trans;
 use rustc_typeck as typeck;
 use rustc_privacy;
@@ -113,7 +115,8 @@ pub fn compile_input(sess: &Session,
         };
 
         let outputs = build_output_filenames(input, outdir, output, &krate.attrs, sess);
-        let crate_name = link::find_crate_name(Some(sess), &krate.attrs, input);
+        let crate_name =
+            ::rustc_trans_utils::link::find_crate_name(Some(sess), &krate.attrs, input);
         let ExpansionResult { expanded_crate, defs, analysis, resolutions, mut hir_forest } = {
             phase_2_configure_and_expand(
                 sess, &cstore, krate, registry, &crate_name, addl_plugins, control.make_glob_map,
@@ -206,8 +209,12 @@ pub fn compile_input(sess: &Session,
                 println!("Pre-trans");
                 tcx.print_debug_stats();
             }
+
+            #[cfg(feature="llvm")]
             let trans = phase_4_translate_to_llvm(tcx, analysis, incremental_hashes_map,
                                                   &outputs);
+            #[cfg(not(feature="llvm"))]
+            let trans = { panic!("LLVM not supported by this rustc."); () };
 
             if log_enabled!(::log::LogLevel::Info) {
                 println!("Post-trans");
@@ -225,34 +232,42 @@ pub fn compile_input(sess: &Session,
         })??
     };
 
-    if sess.opts.debugging_opts.print_type_sizes {
-        sess.code_stats.borrow().print_type_sizes();
-    }
+    #[cfg(not(feature="llvm"))]
+    unreachable!();
 
-    let (phase5_result, trans) = phase_5_run_llvm_passes(sess, trans);
+    #[cfg(feature="llvm")]
+    {
+        if sess.opts.debugging_opts.print_type_sizes {
+            sess.code_stats.borrow().print_type_sizes();
+        }
 
-    controller_entry_point!(after_llvm,
-                            sess,
-                            CompileState::state_after_llvm(input, sess, outdir, output, &trans),
-                            phase5_result);
-    phase5_result?;
+        let (phase5_result, trans) = phase_5_run_llvm_passes(sess, trans);
 
-    phase_6_link_output(sess, &trans, &outputs);
+        controller_entry_point!(after_llvm,
+                                sess,
+                                CompileState::state_after_llvm(input, sess, outdir, output, &trans),
+                                phase5_result);
+        phase5_result?;
 
-    // Now that we won't touch anything in the incremental compilation directory
-    // any more, we can finalize it (which involves renaming it)
-    rustc_incremental::finalize_session_directory(sess, trans.link.crate_hash);
+        phase_6_link_output(sess, &trans, &outputs);
 
-    if sess.opts.debugging_opts.perf_stats {
-        sess.print_perf_stats();
-    }
+        // Now that we won't touch anything in the incremental compilation directory
+        // any more, we can finalize it (which involves renaming it)
+        rustc_incremental::finalize_session_directory(sess, trans.link.crate_hash);
+
+        if sess.opts.debugging_opts.perf_stats {
+            sess.print_perf_stats();
+        }
 
-    controller_entry_point!(compilation_done,
-                            sess,
-                            CompileState::state_when_compilation_done(input, sess, outdir, output),
-                            Ok(()));
+        controller_entry_point!(
+            compilation_done,
+            sess,
+            CompileState::state_when_compilation_done(input, sess, outdir, output),
+            Ok(())
+        );
 
-    Ok(())
+        Ok(())
+    }
 }
 
 fn keep_hygiene_data(sess: &Session) -> bool {
@@ -360,6 +375,7 @@ pub struct CompileState<'a, 'tcx: 'a> {
     pub resolutions: Option<&'a Resolutions>,
     pub analysis: Option<&'a ty::CrateAnalysis>,
     pub tcx: Option<TyCtxt<'a, 'tcx, 'tcx>>,
+    #[cfg(feature="llvm")]
     pub trans: Option<&'a trans::CrateTranslation>,
 }
 
@@ -386,6 +402,7 @@ impl<'a, 'tcx> CompileState<'a, 'tcx> {
             resolutions: None,
             analysis: None,
             tcx: None,
+            #[cfg(feature="llvm")]
             trans: None,
         }
     }
@@ -474,7 +491,7 @@ impl<'a, 'tcx> CompileState<'a, 'tcx> {
         }
     }
 
-
+    #[cfg(feature="llvm")]
     fn state_after_llvm(input: &'a Input,
                         session: &'tcx Session,
                         out_dir: &'a Option<PathBuf>,
@@ -906,6 +923,7 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,
     mir::provide(&mut local_providers);
     reachable::provide(&mut local_providers);
     rustc_privacy::provide(&mut local_providers);
+    #[cfg(feature="llvm")]
     trans::provide(&mut local_providers);
     typeck::provide(&mut local_providers);
     ty::provide(&mut local_providers);
@@ -918,6 +936,7 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,
 
     let mut extern_providers = ty::maps::Providers::default();
     cstore::provide(&mut extern_providers);
+    #[cfg(feature="llvm")]
     trans::provide(&mut extern_providers);
     ty::provide_extern(&mut extern_providers);
     traits::provide_extern(&mut extern_providers);
@@ -1063,6 +1082,7 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,
 
 /// Run the translation phase to LLVM, after which the AST and analysis can
 /// be discarded.
+#[cfg(feature="llvm")]
 pub fn phase_4_translate_to_llvm<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
                                            analysis: ty::CrateAnalysis,
                                            incremental_hashes_map: IncrementalHashesMap,
@@ -1084,6 +1104,7 @@ pub fn phase_4_translate_to_llvm<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 
 /// Run LLVM itself, producing a bitcode file, assembly file or object file
 /// as a side effect.
+#[cfg(feature="llvm")]
 pub fn phase_5_run_llvm_passes(sess: &Session,
                                trans: write::OngoingCrateTranslation)
                                -> (CompileResult, trans::CrateTranslation) {
@@ -1102,6 +1123,7 @@ pub fn phase_5_run_llvm_passes(sess: &Session,
 
 /// Run the linker on any artifacts that resulted from the LLVM run.
 /// This should produce either a finished executable or library.
+#[cfg(feature="llvm")]
 pub fn phase_6_link_output(sess: &Session,
                            trans: &trans::CrateTranslation,
                            outputs: &OutputFilenames) {
@@ -1123,7 +1145,7 @@ fn write_out_deps(sess: &Session, outputs: &OutputFilenames, crate_name: &str) {
         match *output_type {
             OutputType::Exe => {
                 for output in sess.crate_types.borrow().iter() {
-                    let p = link::filename_for_input(sess, *output, crate_name, outputs);
+                    let p = ::rustc_trans_utils::link::filename_for_input(sess, *output, crate_name, outputs);
                     out_filenames.push(p);
                 }
             }
@@ -1233,15 +1255,15 @@ pub fn collect_crate_types(session: &Session, attrs: &[ast::Attribute]) -> Vec<c
     if base.is_empty() {
         base.extend(attr_types);
         if base.is_empty() {
-            base.push(link::default_output_for_target(session));
+            base.push(::rustc_trans_utils::link::default_output_for_target(session));
         }
         base.sort();
         base.dedup();
     }
 
     base.into_iter()
         .filter(|crate_type| {
-            let res = !link::invalid_output_for_target(session, *crate_type);
+            let res = !rustc_trans_utils::link::invalid_output_for_target(session, *crate_type);
 
             if !res {
                 session.warn(&format!("dropping unsupported crate type `{}` for target `{}`",

src/librustc_driver/lib.rs

@@ -54,6 +54,7 @@ extern crate rustc_resolve;
 extern crate rustc_save_analysis;
 #[cfg(feature="llvm")]
 extern crate rustc_trans;
+extern crate rustc_trans_utils;
 extern crate rustc_typeck;
 extern crate serialize;
 #[macro_use]
@@ -68,7 +69,9 @@ use pretty::{PpMode, UserIdentifiedItem};
 use rustc_resolve as resolve;
 use rustc_save_analysis as save;
 use rustc_save_analysis::DumpHandler;
+#[cfg(feature="llvm")]
 use rustc_trans::back::link;
+#[cfg(feature="llvm")]
 use rustc_trans::back::write::{RELOC_MODEL_ARGS, CODE_GEN_MODEL_ARGS};
 use rustc::dep_graph::DepGraph;
 use rustc::session::{self, config, Session, build_session, CompileResult};
@@ -83,6 +86,8 @@ use rustc::middle::cstore::MetadataLoader;
 use rustc_metadata::locator;
 use rustc_metadata::cstore::CStore;
 use rustc::util::common::{time, ErrorReported};
+#[cfg(not(feature="llvm"))]
+use rustc_back::target::Target;
 
 use serialize::json::ToJson;
 
@@ -95,6 +100,8 @@ use std::ffi::OsString;
 use std::io::{self, Read, Write};
 use std::iter::repeat;
 use std::path::PathBuf;
+#[cfg(not(feature="llvm"))]
+use std::path::Path;
 use std::process::{self, Command, Stdio};
 use std::rc::Rc;
 use std::str;
@@ -112,6 +119,7 @@ pub mod test;
 
 pub mod driver;
 pub mod pretty;
+#[cfg(feature="llvm")]
 pub mod target_features;
 mod derive_registrar;
 
@@ -220,6 +228,7 @@ pub fn run_compiler<'a>(args: &[String],
     let (sopts, cfg) = config::build_session_options_and_crate_config(&matches);
 
     if sopts.debugging_opts.debug_llvm {
+        #[cfg(feature="llvm")]
         rustc_trans::enable_llvm_debug();
     }
 
@@ -249,10 +258,12 @@ pub fn run_compiler<'a>(args: &[String],
     let mut sess = session::build_session_with_codemap(
         sopts, &dep_graph, input_file_path, descriptions, cstore.clone(), codemap, emitter_dest,
     );
+    #[cfg(feature="llvm")]
     rustc_trans::init(&sess);
     rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
 
     let mut cfg = config::build_configuration(&sess, cfg);
+    #[cfg(feature="llvm")]
     target_features::add_configuration(&mut cfg, &sess);
     sess.parse_sess.config = cfg;
 
@@ -528,9 +539,11 @@ impl<'a> CompilerCalls<'a> for RustcDefaultCalls {
                     None,
                     descriptions.clone(),
                     cstore.clone());
+                #[cfg(feature="llvm")]
                 rustc_trans::init(&sess);
                 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
                 let mut cfg = config::build_configuration(&sess, cfg.clone());
+                #[cfg(feature="llvm")]
                 target_features::add_configuration(&mut cfg, &sess);
                 sess.parse_sess.config = cfg;
                 let should_stop =
@@ -723,14 +736,14 @@ impl RustcDefaultCalls {
                     };
                     let attrs = attrs.as_ref().unwrap();
                     let t_outputs = driver::build_output_filenames(input, odir, ofile, attrs, sess);
-                    let id = link::find_crate_name(Some(sess), attrs, input);
+                    let id = rustc_trans_utils::link::find_crate_name(Some(sess), attrs, input);
                     if *req == PrintRequest::CrateName {
                         println!("{}", id);
                         continue;
                     }
                     let crate_types = driver::collect_crate_types(sess, attrs);
                     for &style in &crate_types {
-                        let fname = link::filename_for_input(sess, style, &id, &t_outputs);
+                        let fname = rustc_trans_utils::link::filename_for_input(sess, style, &id, &t_outputs);
                         println!("{}",
                                  fname.file_name()
                                       .unwrap()
@@ -779,20 +792,25 @@ impl RustcDefaultCalls {
                 }
                 PrintRequest::RelocationModels => {
                     println!("Available relocation models:");
+                    #[cfg(features="llvm")]
                     for &(name, _) in RELOC_MODEL_ARGS.iter() {
                         println!("    {}", name);
                     }
                     println!("");
                 }
                 PrintRequest::CodeModels => {
                     println!("Available code models:");
+                    #[cfg(features="llvm")]
                     for &(name, _) in CODE_GEN_MODEL_ARGS.iter(){
                         println!("    {}", name);
                     }
                     println!("");
                 }
                 PrintRequest::TargetCPUs | PrintRequest::TargetFeatures => {
+                    #[cfg(feature="llvm")]
                     rustc_trans::print(*req, sess);
+                    #[cfg(not(feature="llvm"))]
+                    panic!("LLVM not supported by this rustc")
                 }
             }
         }
@@ -831,6 +849,7 @@ pub fn version(binary: &str, matches: &getopts::Matches) {
         println!("commit-date: {}", unw(commit_date_str()));
         println!("host: {}", config::host_triple());
         println!("release: {}", unw(release_str()));
+        #[cfg(feature="llvm")]
         rustc_trans::print_version();
     }
 }
@@ -1128,6 +1147,7 @@ pub fn handle_options(args: &[String]) -> Option<getopts::Matches> {
     }
 
     if cg_flags.contains(&"passes=list".to_string()) {
+        #[cfg(feature="llvm")]
         rustc_trans::print_passes();
         return None;
     }
@@ -1255,6 +1275,7 @@ pub fn diagnostics_registry() -> errors::registry::Registry {
     all_errors.extend_from_slice(&rustc_borrowck::DIAGNOSTICS);
     all_errors.extend_from_slice(&rustc_resolve::DIAGNOSTICS);
     all_errors.extend_from_slice(&rustc_privacy::DIAGNOSTICS);
+    #[cfg(feature="llvm")]
     all_errors.extend_from_slice(&rustc_trans::DIAGNOSTICS);
     all_errors.extend_from_slice(&rustc_const_eval::DIAGNOSTICS);
     all_errors.extend_from_slice(&rustc_metadata::DIAGNOSTICS);

src/librustc_driver/test.rs

@@ -14,6 +14,7 @@ use driver;
 use rustc::dep_graph::DepGraph;
 use rustc_lint;
 use rustc_resolve::MakeGlobMap;
+#[cfg(feature="llvm")]
 use rustc_trans;
 use rustc::middle::lang_items;
 use rustc::middle::free_region::FreeRegionMap;
@@ -113,6 +114,7 @@ fn test_env<F>(source_string: &str,
                                        diagnostic_handler,
                                        Rc::new(CodeMap::new(FilePathMapping::empty())),
                                        cstore.clone());
+    #[cfg(feature="llvm")]
     rustc_trans::init(&sess);
     rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
     let input = config::Input::Str {

src/librustc_trans/Cargo.toml

@@ -26,6 +26,7 @@ rustc_errors = { path = "../librustc_errors" }
 rustc_incremental = { path = "../librustc_incremental" }
 rustc_llvm = { path = "../librustc_llvm" }
 rustc_platform_intrinsics = { path = "../librustc_platform_intrinsics" }
+rustc_trans_utils = { path = "../librustc_trans_utils" }
 serialize = { path = "../libserialize" }
 syntax = { path = "../libsyntax" }
 syntax_pos = { path = "../libsyntax_pos" }