Refactor Lexer to support an abstract InputSource class

This patch allows us to remove the fmemopen lex_string hack to support
parsing buffers. This will allow us to support mutliple sources such as
metadata imports etc. The patch here updates the parser to hold onto a
reference to the lexer rather than 'owning' the lexer which allows us to
decouple the move semantics here.

Fixes #1203 #1000

1 files changed, 2 insertions, 4 deletions

diff --git a/gcc/rust/rust-buffered-queue.h b/gcc/rust/rust-buffered-queue.h
index 39f3506..afcc467 100644
--- a/gcc/rust/rust-buffered-queue.h
+++ b/gcc/rust/rust-buffered-queue.h
@@ -28,9 +28,7 @@ template <typename T, typename Source> class buffered_queue
 {
 public:
   // Construct empty queue from Source src.
-  buffered_queue (Source src)
-    : source (std::move (src)), start (0), end (0), buffer ()
-  {}
+  buffered_queue (Source src) : source (src), start (0), end (0), buffer () {}
 
   /* disable copying (since source is probably non-copyable)
    * TODO is this actually a good idea? If source is non-copyable, it would
@@ -104,7 +102,7 @@ public:
 	/* iterate through buffer and invoke operator () on source on values
 	 * past original end */
 	for (int i = 0; i < num_items_to_read; i++)
-	  buffer[end + i] = source ();
+	  buffer[end + i] = source.next ();
 
 	// move end based on additional items added
 	end += num_items_to_read;