re PR c++/14329 ([4.1 only] badly formatted warnings for SRA replacements used uninitialized)

        PR tree-opt/14329
        * tree.h (struct tree_decl): Add debug_expr_is_from.
        (DECL_DEBUG_EXPR_IS_FROM): New.
        (DECL_DEBUG_EXPR): Rename from DECL_DEBUG_ALIAS_OF.
        * dwarf2out.c (dwarf2out_var_location): Update to match.
        * tree-outof-ssa.c (create_temp): Likewise.
        * var-tracking.c (track_expr_p): Likewise.
        * tree-sra.c (instantiate_element): Set DECL_DEBUG_EXPR.
        * c-objc-common.c (c_tree_printer) <'D'>: Handle DECL_DEBUG_EXPR.
        * toplev.c (default_tree_printer): Likewise.

From-SVN: r94317

1 files changed, 9 insertions, 4 deletions

diff --git a/gcc/tree.h b/gcc/tree.h
index b393cab..a4c590b 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -2018,9 +2018,13 @@ struct tree_binfo GTY (())
    writing debugging information about vfield and vbase decls for C++.  */
 #define DECL_FCONTEXT(NODE) (FIELD_DECL_CHECK (NODE)->decl.vindex)
 
-/* For VAR_DECL, this is set to the variable we were split from, due to
-   optimization. */
-#define DECL_DEBUG_ALIAS_OF(NODE) (DECL_CHECK (NODE)->decl.vindex)
+/* For VAR_DECL, this is set to either an expression that it was split
+   from (if DECL_DEBUG_EXPR_IS_FROM is true), otherwise a tree_list of
+   subexpressions that it was split into.  */
+#define DECL_DEBUG_EXPR(NODE) (DECL_CHECK (NODE)->decl.vindex)
+
+#define DECL_DEBUG_EXPR_IS_FROM(NODE) \
+  (DECL_CHECK (NODE)->decl.debug_expr_is_from)
 
 /* Every ..._DECL node gets a unique number.  */
 #define DECL_UID(NODE) (DECL_CHECK (NODE)->decl.uid)
@@ -2361,7 +2365,8 @@ struct tree_decl GTY(())
   unsigned possibly_inlined : 1;
   unsigned preserve_flag: 1;
   unsigned gimple_formal_temp : 1;
-  /* 13 unused bits.  */
+  unsigned debug_expr_is_from : 1;
+  /* 12 unused bits.  */
 
   union tree_decl_u1 {
     /* In a FUNCTION_DECL for which DECL_BUILT_IN holds, this is