debuginfo: Fix issue with DWARF compile unit names

src/librustc/driver/driver.rs

@@ -897,42 +897,56 @@ pub fn build_session_options(binary: ~str,
     return sopts;
 }
 
-pub fn build_session(sopts: @session::Options, demitter: @diagnostic::Emitter)
+pub fn build_session(sopts: @session::Options,
+                     local_crate_source_file: Option<Path>,
+                     demitter: @diagnostic::Emitter)
                      -> Session {
     let codemap = @codemap::CodeMap::new();
     let diagnostic_handler =
         diagnostic::mk_handler(Some(demitter));
     let span_diagnostic_handler =
         diagnostic::mk_span_handler(diagnostic_handler, codemap);
-    build_session_(sopts, codemap, demitter, span_diagnostic_handler)
+
+    build_session_(sopts, local_crate_source_file, codemap, demitter, span_diagnostic_handler)
 }
 
 pub fn build_session_(sopts: @session::Options,
-                      cm: @codemap::CodeMap,
+                      local_crate_source_file: Option<Path>,
+                      codemap: @codemap::CodeMap,
                       demitter: @diagnostic::Emitter,
                       span_diagnostic_handler: @diagnostic::SpanHandler)
                       -> Session {
     let target_cfg = build_target_config(sopts, demitter);
-    let p_s = parse::new_parse_sess_special_handler(span_diagnostic_handler,
-                                                    cm);
+    let p_s = parse::new_parse_sess_special_handler(span_diagnostic_handler, codemap);
     let cstore = @CStore::new(token::get_ident_interner());
     let filesearch = @filesearch::FileSearch::new(
         &sopts.maybe_sysroot,
         sopts.target_triple,
         sopts.addl_lib_search_paths);
+
+    // Make the path absolute, if necessary
+    let local_crate_source_file = local_crate_source_file.map(|path|
+        if path.is_absolute() {
+            path.clone()
+        } else {
+            os::getcwd().join(path.clone())
+        }
+    );
+
     @Session_ {
         targ_cfg: target_cfg,
         opts: sopts,
         cstore: cstore,
         parse_sess: p_s,
-        codemap: cm,
+        codemap: codemap,
         // For a library crate, this is always none
         entry_fn: RefCell::new(None),
         entry_type: Cell::new(None),
         macro_registrar_fn: RefCell::new(None),
         span_diagnostic: span_diagnostic_handler,
         filesearch: filesearch,
         building_library: Cell::new(false),
+        local_crate_source_file: local_crate_source_file,
         working_dir: os::getcwd(),
         lints: RefCell::new(HashMap::new()),
         node_id: Cell::new(1),
@@ -1164,13 +1178,8 @@ mod test {
               Ok(m) => m,
               Err(f) => fail!("test_switch_implies_cfg_test: {}", f.to_err_msg())
             };
-        let sessopts = build_session_options(
-            ~"rustc",
-            matches,
-            @diagnostic::DefaultEmitter as @diagnostic::Emitter);
-        let sess = build_session(sessopts,
-                                 @diagnostic::DefaultEmitter as
-                                    @diagnostic::Emitter);
+        let sessopts = build_session_options(~"rustc", matches, @diagnostic::DefaultEmitter);
+        let sess = build_session(sessopts, None, @diagnostic::DefaultEmitter);
         let cfg = build_configuration(sess);
         assert!((attr::contains_name(cfg, "test")));
     }
@@ -1187,13 +1196,8 @@ mod test {
                        f.to_err_msg());
               }
             };
-        let sessopts = build_session_options(
-            ~"rustc",
-            matches,
-            @diagnostic::DefaultEmitter as @diagnostic::Emitter);
-        let sess = build_session(sessopts,
-                                 @diagnostic::DefaultEmitter as
-                                    @diagnostic::Emitter);
+        let sessopts = build_session_options(~"rustc", matches, @diagnostic::DefaultEmitter);
+        let sess = build_session(sessopts, None, @diagnostic::DefaultEmitter);
         let cfg = build_configuration(sess);
         let mut test_items = cfg.iter().filter(|m| "test" == m.name());
         assert!(test_items.next().is_some());

src/librustc/driver/session.rs

@@ -211,6 +211,9 @@ pub struct Session_ {
     macro_registrar_fn: RefCell<Option<ast::DefId>>,
     filesearch: @filesearch::FileSearch,
     building_library: Cell<bool>,
+    // The name of the root source file of the crate, in the local file system. The path is always
+    // expected to be absolute. `None` means that there is no source file.
+    local_crate_source_file: Option<Path>,
     working_dir: Path,
     lints: RefCell<HashMap<ast::NodeId,
                            ~[(lint::Lint, codemap::Span, ~str)]>>,

src/librustc/lib.rs

@@ -230,22 +230,22 @@ pub fn run_compiler(args: &[~str], demitter: @diagnostic::Emitter) {
         version(binary);
         return;
     }
-    let input = match matches.free.len() {
+    let (input, input_file_path) = match matches.free.len() {
       0u => d::early_error(demitter, "no input filename given"),
       1u => {
         let ifile = matches.free[0].as_slice();
         if "-" == ifile {
             let src = str::from_utf8_owned(io::stdin().read_to_end()).unwrap();
-            d::StrInput(src.to_managed())
+            (d::StrInput(src.to_managed()), None)
         } else {
-            d::FileInput(Path::new(ifile))
+            (d::FileInput(Path::new(ifile)), Some(Path::new(ifile)))
         }
       }
       _ => d::early_error(demitter, "multiple input filenames provided")
     };
 
     let sopts = d::build_session_options(binary, matches, demitter);
-    let sess = d::build_session(sopts, demitter);
+    let sess = d::build_session(sopts, input_file_path, demitter);
     let odir = matches.opt_str("out-dir").map(|o| Path::new(o));
     let ofile = matches.opt_str("o").map(|o| Path::new(o));
     let cfg = d::build_configuration(sess);

src/librustc/middle/trans/base.rs

@@ -2741,15 +2741,15 @@ pub fn trans_crate(sess: session::Session,
     let link_meta = link::build_link_meta(sess, crate.attrs, output,
                                           &mut symbol_hasher);
 
-    // Append ".rc" to crate name as LLVM module identifier.
+    // Append ".rs" to crate name as LLVM module identifier.
     //
     // LLVM code generator emits a ".file filename" directive
     // for ELF backends. Value of the "filename" is set as the
     // LLVM module identifier.  Due to a LLVM MC bug[1], LLVM
     // crashes if the module identifer is same as other symbols
     // such as a function name in the module.
     // 1. http://llvm.org/bugs/show_bug.cgi?id=11479
-    let llmod_id = link_meta.crateid.name.clone() + ".rc";
+    let llmod_id = link_meta.crateid.name.clone() + ".rs";
 
     let ccx = @CrateContext::new(sess,
                                      llmod_id,

src/librustc/middle/trans/context.rs

@@ -165,7 +165,7 @@ impl CrateContext {
 
             let (crate_map_name, crate_map) = decl_crate_map(sess, link_meta.clone(), llmod);
             let dbg_cx = if sess.opts.debuginfo {
-                Some(debuginfo::CrateDebugContext::new(llmod, name.to_owned()))
+                Some(debuginfo::CrateDebugContext::new(llmod))
             } else {
                 None
             };

src/librustc/middle/trans/debuginfo.rs

@@ -142,7 +142,7 @@ use middle::ty;
 use middle::pat_util;
 use util::ppaux;
 
-use std::c_str::ToCStr;
+use std::c_str::{CString, ToCStr};
 use std::cell::{Cell, RefCell};
 use std::hashmap::HashMap;
 use std::hashmap::HashSet;
@@ -173,7 +173,6 @@ static DW_ATE_unsigned_char: c_uint = 0x08;
 
 /// A context object for maintaining all state needed by the debuginfo module.
 pub struct CrateDebugContext {
-    priv crate_file: ~str,
     priv llcontext: ContextRef,
     priv builder: DIBuilderRef,
     priv current_debug_location: Cell<DebugLocation>,
@@ -186,13 +185,12 @@ pub struct CrateDebugContext {
 }
 
 impl CrateDebugContext {
-    pub fn new(llmod: ModuleRef, crate: ~str) -> CrateDebugContext {
+    pub fn new(llmod: ModuleRef) -> CrateDebugContext {
         debug!("CrateDebugContext::new");
         let builder = unsafe { llvm::LLVMDIBuilderCreate(llmod) };
         // DIBuilder inherits context from the module, so we'd better use the same one
         let llcontext = unsafe { llvm::LLVMGetModuleContext(llmod) };
         return CrateDebugContext {
-            crate_file: crate,
             llcontext: llcontext,
             builder: builder,
             current_debug_location: Cell::new(UnknownLocation),
@@ -929,26 +927,49 @@ fn create_DIArray(builder: DIBuilderRef, arr: &[DIDescriptor]) -> DIArray {
     };
 }
 
-fn compile_unit_metadata(cx: @CrateContext) {
-    let dcx = debug_context(cx);
-    let crate_name: &str = dcx.crate_file;
-
-    debug!("compile_unit_metadata: {:?}", crate_name);
+fn compile_unit_metadata(cx: &CrateContext) {
+    let work_dir = &cx.sess.working_dir;
+    let compile_unit_name = match cx.sess.local_crate_source_file {
+        None => fallback_path(cx),
+        Some(ref abs_path) => {
+            if abs_path.is_relative() {
+                cx.sess.warn("debuginfo: Invalid path to crate's local root source file!");
+                fallback_path(cx)
+            } else {
+                match abs_path.path_relative_from(work_dir) {
+                    Some(ref p) if p.is_relative() => {
+                            // prepend "./" if necessary
+                            let dotdot = bytes!("..");
+                            let prefix = &[dotdot[0], ::std::path::SEP_BYTE];
+                            let mut path_bytes = p.as_vec().to_owned();
+
+                            if path_bytes.slice_to(2) != prefix &&
+                               path_bytes.slice_to(2) != dotdot {
+                                path_bytes.insert(0, prefix[0]);
+                                path_bytes.insert(1, prefix[1]);
+                            }
+
+                            path_bytes.to_c_str()
+                        }
+                    _ => fallback_path(cx)
+                }
+            }
+        }
+    };
 
-    // FIXME (#9639): This needs to handle non-utf8 paths
-    let work_dir = cx.sess.working_dir.as_str().unwrap();
+    debug!("compile_unit_metadata: {:?}", compile_unit_name);
     let producer = format!("rustc version {}", env!("CFG_VERSION"));
 
-    crate_name.with_c_str(|crate_name| {
-        work_dir.with_c_str(|work_dir| {
+    compile_unit_name.with_ref(|compile_unit_name| {
+        work_dir.as_vec().with_c_str(|work_dir| {
             producer.with_c_str(|producer| {
                 "".with_c_str(|flags| {
                     "".with_c_str(|split_name| {
                         unsafe {
                             llvm::LLVMDIBuilderCreateCompileUnit(
-                                dcx.builder,
+                                debug_context(cx).builder,
                                 DW_LANG_RUST,
-                                crate_name,
+                                compile_unit_name,
                                 work_dir,
                                 producer,
                                 cx.sess.opts.optimize != session::No,
@@ -961,6 +982,10 @@ fn compile_unit_metadata(cx: @CrateContext) {
             })
         })
     });
+
+    fn fallback_path(cx: &CrateContext) -> CString {
+        cx.link_meta.crateid.name.to_c_str()
+    }
 }
 
 fn declare_local(bcx: &Block,

src/librustc/middle/typeck/infer/test.rs

@@ -52,7 +52,7 @@ fn setup_env(test_name: &str, source_string: &str) -> Env {
     let matches = getopts(~[~"-Z", ~"verbose"], optgroups()).get();
     let diag = diagnostic::collect(messages);
     let sessopts = build_session_options(~"rustc", &matches, diag);
-    let sess = build_session(sessopts, diag);
+    let sess = build_session(sessopts, None, diag);
     let cfg = build_configuration(sess, ~"whatever", str_input(~""));
     let dm = HashMap();
     let amap = HashMap();

src/librustdoc/core.rs

@@ -64,9 +64,9 @@ fn get_ast_and_resolve(cpath: &Path,
         syntax::diagnostic::mk_span_handler(diagnostic_handler, parsesess.cm);
 
     let sess = driver::driver::build_session_(sessopts,
+                                              Some(cpath.clone()),
                                               parsesess.cm,
-                                              @diagnostic::DefaultEmitter as
-                                                @diagnostic::Emitter,
+                                              @diagnostic::DefaultEmitter,
                                               span_diagnostic_handler);
 
     let mut cfg = build_configuration(sess);

src/librustdoc/test.rs

@@ -34,7 +34,8 @@ use visit_ast::RustdocVisitor;
 
 pub fn run(input: &str, matches: &getopts::Matches) -> int {
     let parsesess = parse::new_parse_sess(None);
-    let input = driver::FileInput(Path::new(input));
+    let input_path = Path::new(input);
+    let input = driver::FileInput(input_path.clone());
     let libs = matches.opt_strs("L").map(|s| Path::new(s.as_slice()));
     let libs = @RefCell::new(libs.move_iter().collect());
 
@@ -52,9 +53,9 @@ pub fn run(input: &str, matches: &getopts::Matches) -> int {
         diagnostic::mk_span_handler(diagnostic_handler, parsesess.cm);
 
     let sess = driver::build_session_(sessopts,
+                                      Some(input_path),
                                       parsesess.cm,
-                                      @diagnostic::DefaultEmitter as
-                                            @diagnostic::Emitter,
+                                      @diagnostic::DefaultEmitter,
                                       span_diagnostic_handler);
 
     let cfg = driver::build_configuration(sess);
@@ -113,9 +114,9 @@ fn runtest(test: &str, cratename: &str, libs: HashSet<Path>) {
         diagnostic::mk_span_handler(diagnostic_handler, parsesess.cm);
 
     let sess = driver::build_session_(sessopts,
+                                      None,
                                       parsesess.cm,
-                                      @diagnostic::DefaultEmitter as
-                                            @diagnostic::Emitter,
+                                      @diagnostic::DefaultEmitter,
                                       span_diagnostic_handler);
 
     let outdir = TempDir::new("rustdoctest").expect("rustdoc needs a tempdir");

src/librustpkg/lib.rs

@@ -114,8 +114,8 @@ impl<'a> PkgScript<'a> {
         };
         let input = driver::FileInput(script.clone());
         let sess = driver::build_session(options,
-                                         @diagnostic::DefaultEmitter as
-                                            @diagnostic::Emitter);
+                                         Some(script.clone()),
+                                         @diagnostic::DefaultEmitter);
         let cfg = driver::build_configuration(sess);
         let crate = driver::phase_1_parse_input(sess, cfg.clone(), &input);
         let loader = &mut Loader::new(sess);

src/librustpkg/tests.rs

@@ -1770,11 +1770,8 @@ fn test_linker_build() {
     let matches = getopts([], optgroups());
     let options = build_session_options(~"rustpkg",
                                         matches.as_ref().unwrap(),
-                                        @diagnostic::DefaultEmitter as
-                                            @diagnostic::Emitter);
-    let sess = build_session(options,
-                             @diagnostic::DefaultEmitter as
-                                @diagnostic::Emitter);
+                                        @diagnostic::DefaultEmitter);
+    let sess = build_session(options, None, @diagnostic::DefaultEmitter);
     let test_sys = test_sysroot();
     // FIXME (#9639): This needs to handle non-utf8 paths
     let cc = get_cc_prog(sess);

src/librustpkg/util.rs

@@ -264,6 +264,7 @@ pub fn compile_input(context: &BuildContext,
     debug!("About to build session...");
 
     let sess = driver::build_session(options,
+                                     Some(in_file.clone()),
                                      @diagnostic::DefaultEmitter as
                                         @diagnostic::Emitter);
 

src/test/debug-info/issue11600.rs

@@ -0,0 +1,27 @@
+fn main() {
+    let args : ~[~str] = ::std::os::args();
+    ::std::io::println(args[0]);
+}
+
+
+// xfail-android: FIXME(#10381)
+
+// This test case checks whether compile unit names are set correctly, so that the correct default
+// source file can be found.
+
+// compile-flags:-Z extra-debug-info
+// debugger:list
+// check:1[...]fn main() {
+// check:2[...]let args : ~[~str] = ::std::os::args();
+// check:3[...]::std::io::println(args[0]);
+// check:4[...]}
+
+// Copyright 2013 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.