Come up with memop_ret enum instead of int endp for memory operations.

2018-11-27  Martin Liska  <mliska@suse.cz>

	* asan.c (asan_emit_stack_protection): Use new enum values
	instead of int constants.
	* builtins.c (expand_builtin_memory_copy_args): Replace int
	type with memop_ret enum type.
	(expand_builtin_mempcpy_args): Likewise.
	(expand_builtin_memcpy): Use new enum values
	instead of int constants. Likewise.
	(expand_builtin_mempcpy): Likewise.
	(expand_movstr): Likewise.
	(expand_builtin_strcpy_args): Likewise.
	(expand_builtin_stpcpy_1): Likewise.
	(expand_builtin_strncpy): Likewise.
	(expand_builtin_memset_args): Likewise.
	* expr.c (move_by_pieces_d::finish_endp): Rename to ...
	(move_by_pieces_d::finish_retmode): ... this.
	(move_by_pieces): Change last argument type to memop_ret.
	(store_by_pieces): Use new enum values
	instead of int constants.
	(emit_block_move_hints): Likewise.
	(emit_push_insn): Likewise.
	(store_expr): Likewise.
	* expr.h (store_by_pieces): Change int to newly added enum
	type.
	* rtl.h (enum memop_ret): Define.
	(move_by_pieces): Use the enum type.

From-SVN: r266508

1 files changed, 16 insertions, 1 deletions

diff --git a/gcc/rtl.h b/gcc/rtl.h
index dd3ce06..c2aaa9e 100644
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -4046,9 +4046,24 @@ extern void expand_null_return (void);
 extern void expand_naked_return (void);
 extern void emit_jump (rtx);
 
+/* Memory operation built-ins differ by return value.  Mapping
+   of the enum values is following:
+   - RETURN_BEGIN - return destination, e.g. memcpy
+   - RETURN_END - return destination + n, e.g. mempcpy
+   - RETURN_END_MINUS_ONE - return a pointer to the terminating
+    null byte of the string, e.g. strcpy
+*/
+
+enum memop_ret
+{
+  RETURN_BEGIN,
+  RETURN_END,
+  RETURN_END_MINUS_ONE
+};
+
 /* In expr.c */
 extern rtx move_by_pieces (rtx, rtx, unsigned HOST_WIDE_INT,
-			   unsigned int, int);
+			   unsigned int, memop_ret);
 extern poly_int64 find_args_size_adjust (rtx_insn *);
 extern poly_int64 fixup_args_size_notes (rtx_insn *, rtx_insn *, poly_int64);