1 files changed, 18 insertions, 66 deletions

diff --git a/gcc/streamer-hooks.h b/gcc/streamer-hooks.h
index 29a6591ccc0..6c45102376a 100644
--- a/gcc/streamer-hooks.h
+++ b/gcc/streamer-hooks.h
@@ -39,76 +39,28 @@ struct lto_streamer_cache_d;
    Hooks marked [REQ] are required to be set.  Those marked [OPT] may
    be NULL, if the streamer does not need to implement them.  */
 struct streamer_hooks {
-  /* [REQ] A string identifying this streamer.  */
-  const char *name;
-
-  /* [REQ] Called by lto_streamer_cache_create to instantiate a cache of
-     well-known nodes.  These are tree nodes that are always
-     instantiated by the compiler on startup.  Additionally, these
-     nodes need to be shared.  This function should call
-     lto_streamer_cache_append on every tree node that it wishes to
-     preload in the streamer cache.  This way, the writer will only
-     write out a reference to the tree and the reader will instantiate
-     the tree out of this pre-populated cache.  */
-  void (*preload_common_nodes) (struct lto_streamer_cache_d *);
-
-  /* [REQ] Return true if the given tree is supported by this streamer.  */
-  bool (*is_streamable) (tree);
-
-  /* [OPT] Called by lto_write_tree after writing all the common parts of
-     a tree.  If defined, the callback is in charge of writing all
-     the fields that lto_write_tree did not write out.  Arguments
-     are as in lto_write_tree.
-
-     The following tree fields are not handled by common code:
-
-	DECL_ABSTRACT_ORIGIN
-	DECL_INITIAL
-	DECL_SAVED_TREE
-
-     Callbacks may choose to ignore or handle them.  If handled,
-     the reader should read them in the exact same sequence written
-     by the writer.  */
+  /* [REQ] Called by every tree streaming routine that needs to write
+     a tree node.  The arguments are: output_block where to write the
+     node, the tree node to write and a boolean flag that should be true
+     if the caller wants to write a reference to the tree, instead of the
+     tree itself.  The referencing mechanism is up to each streamer to
+     implement.  */
   void (*write_tree) (struct output_block *, tree, bool);
 
-  /* [OPT] Called by lto_read_tree after reading all the common parts of
-     a tree.  If defined, the callback is in charge of reading all
-     the fields that lto_read_tree did not read in.  Arguments
-     are as in lto_read_tree.  */
-  void (*read_tree) (struct lto_input_block *, struct data_in *, tree);
-
-  /* [OPT] Called by lto_output_tree_ref to determine if the given tree node
-     should be emitted as a reference to the table of declarations
-     (the same table that holds global declarations).  */
-  bool (*indexable_with_decls_p) (tree);
-
-  /* [OPT] Called by pack_value_fields to store any non-pointer fields
-     in the tree structure.  The arguments are as in pack_value_fields.  */
-  void (*pack_value_fields) (struct bitpack_d *, tree);
-
-  /* [OPT] Called by unpack_value_fields to retrieve any non-pointer fields
-     in the tree structure.  The arguments are as in unpack_value_fields.  */
-  void (*unpack_value_fields) (struct bitpack_d *, tree);
-
-  /* [OPT] Called by lto_materialize_tree for tree nodes that it does not
-     know how to allocate memory for.  If defined, this hook should
-     return a new tree node of the given code.  The data_in and
-     input_block arguments are passed in case the hook needs to
-     read more data from the stream to allocate the node.
-     If this hook returns NULL, then lto_materialize_tree will attempt
-     to allocate the tree by calling make_node directly.  */
-  tree (*alloc_tree) (enum tree_code, struct lto_input_block *,
-                      struct data_in *);
-
-  /* [OPT] Called by lto_output_tree_header to write any streamer-specific
-     information needed to allocate the tree.  This hook may assume
-     that the basic header data (tree code, etc) has already been
-     written.  It should only write any extra data needed to allocate
-     the node (e.g., in the case of CALL_EXPR, this hook would write
-     the number of arguments to the CALL_EXPR).  */
-  void (*output_tree_header) (struct output_block *, tree);
+  /* [REQ] Called by every tree streaming routine that needs to read
+     a tree node.  It takes two arguments: an lto_input_block pointing
+     to the buffer where to read from and a data_in instance with tables
+     and descriptors needed by the unpickling routines.  It returns the
+     tree instantiated from the stream.  */
+  tree (*read_tree) (struct lto_input_block *, struct data_in *);
 };
 
+#define stream_write_tree(OB, EXPR, REF_P) \
+    streamer_hooks.write_tree(OB, EXPR, REF_P)
+
+#define stream_read_tree(IB, DATA_IN) \
+    streamer_hooks.read_tree(IB, DATA_IN)
+
 /* Streamer hooks.  */
 extern struct streamer_hooks streamer_hooks;