Make sure that all file loading happens via SourceMap

That way, callers don't need to repeat "let's add this to sm manually
for tracking dependencies" trick.

It should make it easier to switch to using `FileLoader` for binary
files in the future as well

2 files changed, 25 insertions, 8 deletions

diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index 402b42dfbc8..e9789764383 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -25,7 +25,6 @@ use syntax_pos::{Span, DUMMY_SP, FileName};
 
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sync::Lrc;
-use std::fs;
 use std::io::ErrorKind;
 use std::{iter, mem};
 use std::ops::DerefMut;
@@ -1239,13 +1238,11 @@ impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
                     }
 
                     let filename = self.cx.resolve_path(&*file.as_str(), it.span());
-                    match fs::read_to_string(&filename) {
-                        Ok(src) => {
-                            let src_interned = Symbol::intern(&src);
-
-                            // Add this input file to the code map to make it available as
-                            // dependency information
-                            self.cx.source_map().new_source_file(filename.into(), src);
+                    match self.cx.source_map().load_file(&filename) {
+                        Ok(source_file) => {
+                            let src = source_file.src.as_ref()
+                                .expect("freshly loaded file should have a source");
+                            let src_interned = Symbol::intern(src.as_str());
 
                             let include_info = vec![
                                 ast::NestedMetaItem::MetaItem(
diff --git a/src/libsyntax/source_map.rs b/src/libsyntax/source_map.rs
index 74cab00d3c1..ceaa5ee3aa5 100644
--- a/src/libsyntax/source_map.rs
+++ b/src/libsyntax/source_map.rs
@@ -170,6 +170,26 @@ impl SourceMap {
         Ok(self.new_source_file(filename, src))
     }
 
+    /// Loads source file as a binary blob.
+    ///
+    /// Unlike `load_file`, guarantees that no normalization like BOM-removal
+    /// takes place.
+    pub fn load_binary_file(&self, path: &Path) -> io::Result<Vec<u8>> {
+        // Ideally, this should use `self.file_loader`, but it can't
+        // deal with binary files yet.
+        let bytes = fs::read(path)?;
+
+        // We need to add file to the `SourceMap`, so that it is present
+        // in dep-info. There's also an edge case that file might be both
+        // loaded as a binary via `include_bytes!` and as proper `SourceFile`
+        // via `mod`, so we try to use real file contents and not just an
+        // empty string.
+        let text = std::str::from_utf8(&bytes).unwrap_or("")
+            .to_string();
+        self.new_source_file(path.to_owned().into(), text);
+        Ok(bytes)
+    }
+
     pub fn files(&self) -> MappedLockGuard<'_, Vec<Lrc<SourceFile>>> {
         LockGuard::map(self.files.borrow(), |files| &mut files.source_files)
     }