[PATCH] Macro body is trailing array

https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01037.html
	* include/cpplib.h (enum cpp_macro_kind): New.
	(struct cpp_macro): Make body trailing array.  Add kind field,
	delete traditional flag.
	* internal.h (_cpp_new_macro): Declare.
	(_cpp_reserve_room): New inline.
	(_cpp_commit_buf): Declare.
	(_cpp_create_trad_definition): Return new macro.
	* lex.c (_cpp_commit_buff): New.
	* macro.c (macro_real_token_count): Count backwards.
	(replace_args): Pointer equality not orderedness.
	(_cpp_save_parameter): Use _cpp_reserve_room.
	(alloc_expansion_token): Delete.
	(lex_expansion_token): Return macro pointer.  Use _cpp_reserve_room.
	(create_iso_definition): Allocate macro itself.  Adjust for
	different allocation ordering.
	(_cpp_new_macro): New.
	(_cpp_create_definition): Adjust for API changes.
	* traditional.c (push_replacement_text): Don't set traditional
	flag.
	(save_replacement_text): Likewise.
	(_cpp_create_trad_definition): Allocate macro itself, Adjust for
	different allocation ordering.

From-SVN: r263622

1 files changed, 19 insertions, 0 deletions

diff --git a/libcpp/lex.c b/libcpp/lex.c
index fa465be..892cfc4 100644
--- a/libcpp/lex.c
+++ b/libcpp/lex.c
@@ -3725,6 +3725,25 @@ _cpp_aligned_alloc (cpp_reader *pfile, size_t len)
   return result;
 }
 
+/* Commit or allocate storage from a buffer.  */
+
+void *
+_cpp_commit_buff (cpp_reader *pfile, size_t size)
+{
+  void *ptr = BUFF_FRONT (pfile->a_buff);
+
+  if (pfile->hash_table->alloc_subobject)
+    {
+      void *copy = pfile->hash_table->alloc_subobject (size);
+      memcpy (copy, ptr, size);
+      ptr = copy;
+    }
+  else
+    BUFF_FRONT (pfile->a_buff) += size;
+
+  return ptr;
+}
+
 /* Say which field of TOK is in use.  */
 
 enum cpp_token_fld_kind