c-family: Honor -Wno-init-self for cv-qual vars [PR102633]

Since r11-5188-g32934a4f45a721, we drop qualifiers during l-to-r
conversion by creating a NOP_EXPR.  For e.g.

  const int i = i;

that means that the DECL_INITIAL is '(int) i' and not 'i' anymore.
Consequently, we don't suppress_warning here:

711     case DECL_EXPR:
715       if (VAR_P (DECL_EXPR_DECL (*expr_p))
716           && !DECL_EXTERNAL (DECL_EXPR_DECL (*expr_p))
717           && !TREE_STATIC (DECL_EXPR_DECL (*expr_p))
718           && (DECL_INITIAL (DECL_EXPR_DECL (*expr_p)) == DECL_EXPR_DECL (*expr_p))
719           && !warn_init_self)
720         suppress_warning (DECL_EXPR_DECL (*expr_p), OPT_Winit_self);

because of the check on line 718 -- (int) i is not i.  So -Wno-init-self
doesn't disable the warning as it's supposed to.

The following patch fixes it by moving the suppress_warning call from
c_gimplify_expr to the front ends, at points where we haven't created
the NOP_EXPR yet.

	PR middle-end/102633

gcc/c-family/ChangeLog:

	* c-gimplify.cc (c_gimplify_expr) <case DECL_EXPR>: Don't call
	suppress_warning here.

gcc/c/ChangeLog:

	* c-parser.cc (c_parser_initializer): Add new tree parameter.  Use it.
	Call suppress_warning.
	(c_parser_declaration_or_fndef): Pass d down to c_parser_initializer.
	(c_parser_omp_declare_reduction): Pass omp_priv down to
	c_parser_initializer.

gcc/cp/ChangeLog:

	* decl.cc (cp_finish_decl): Call suppress_warning.

gcc/testsuite/ChangeLog:

	* c-c++-common/Winit-self1.c: New test.
	* c-c++-common/Winit-self2.c: New test.

(cherry picked from commit 04ce2400b35225302e0d6883bb0817378180f5d7)

diff --git a/gcc/c-family/c-gimplify.cc b/gcc/c-family/c-gimplify.cc
index 2b683a399821e8e63370f67f952259f7fee4e614..7e55fd73f810ddaea2a8977d9a4f763a8cd424ed 100644 (file)
--- a/gcc/c-family/c-gimplify.cc
+++ b/gcc/c-family/c-gimplify.cc
@@ -704,18 +704,6 @@ c_gimplify_expr (tree *expr_p, gimple_seq *pre_p ATTRIBUTE_UNUSED,
        break;
       }
 
-    case DECL_EXPR:
-      /* This is handled mostly by gimplify.cc, but we have to deal with
-        not warning about int x = x; as it is a GCC extension to turn off
-        this warning but only if warn_init_self is zero.  */
-      if (VAR_P (DECL_EXPR_DECL (*expr_p))
-         && !DECL_EXTERNAL (DECL_EXPR_DECL (*expr_p))
-         && !TREE_STATIC (DECL_EXPR_DECL (*expr_p))
-         && (DECL_INITIAL (DECL_EXPR_DECL (*expr_p)) == DECL_EXPR_DECL (*expr_p))
-         && !warn_init_self)
-       suppress_warning (DECL_EXPR_DECL (*expr_p), OPT_Winit_self);
-      break;
-
     case PREINCREMENT_EXPR:
     case PREDECREMENT_EXPR:
     case POSTINCREMENT_EXPR:

diff --git a/gcc/c/c-parser.cc b/gcc/c/c-parser.cc
index a21449bb83a4c83d8762b199d45478df127b3a39..80f86c177fad3d7e779bfc200941efee7bd52e82 100644 (file)
--- a/gcc/c/c-parser.cc
+++ b/gcc/c/c-parser.cc
@@ -1513,7 +1513,7 @@ static struct c_arg_info *c_parser_parms_list_declarator (c_parser *, tree,
 static struct c_parm *c_parser_parameter_declaration (c_parser *, tree, bool);
 static tree c_parser_simple_asm_expr (c_parser *);
 static tree c_parser_gnu_attributes (c_parser *);
-static struct c_expr c_parser_initializer (c_parser *);
+static struct c_expr c_parser_initializer (c_parser *, tree);
 static struct c_expr c_parser_braced_init (c_parser *, tree, bool,
                                           struct obstack *);
 static void c_parser_initelt (c_parser *, struct obstack *);
@@ -2278,7 +2278,7 @@ c_parser_declaration_or_fndef (c_parser *parser, bool fndef_ok,
                  int flag_sanitize_save = flag_sanitize;
                  if (TREE_CODE (d) == PARM_DECL)
                    flag_sanitize = 0;
-                 init = c_parser_initializer (parser);
+                 init = c_parser_initializer (parser, d);
                  flag_sanitize = flag_sanitize_save;
                  finish_init ();
                }
@@ -5206,11 +5206,13 @@ c_parser_type_name (c_parser *parser, bool alignas_ok)
    Any expression without commas is accepted in the syntax for the
    constant-expressions, with non-constant expressions rejected later.
 
+   DECL is the declaration we're parsing this initializer for.
+
    This function is only used for top-level initializers; for nested
    ones, see c_parser_initval.  */
 
 static struct c_expr
-c_parser_initializer (c_parser *parser)
+c_parser_initializer (c_parser *parser, tree decl)
 {
   if (c_parser_next_token_is (parser, CPP_OPEN_BRACE))
     return c_parser_braced_init (parser, NULL_TREE, false, NULL);
@@ -5219,6 +5221,15 @@ c_parser_initializer (c_parser *parser)
       struct c_expr ret;
       location_t loc = c_parser_peek_token (parser)->location;
       ret = c_parser_expr_no_commas (parser, NULL);
+      /* This is handled mostly by gimplify.cc, but we have to deal with
+        not warning about int x = x; as it is a GCC extension to turn off
+        this warning but only if warn_init_self is zero.  */
+      if (VAR_P (decl)
+         && !DECL_EXTERNAL (decl)
+         && !TREE_STATIC (decl)
+         && ret.value == decl
+         && !warn_init_self)
+       suppress_warning (decl, OPT_Winit_self);
       if (TREE_CODE (ret.value) != STRING_CST
          && TREE_CODE (ret.value) != COMPOUND_LITERAL_EXPR)
        ret = convert_lvalue_to_rvalue (loc, ret, true, true);
@@ -22393,7 +22404,7 @@ c_parser_omp_declare_reduction (c_parser *parser, enum pragma_context context)
                  location_t loc = c_parser_peek_token (parser)->location;
                  rich_location richloc (line_table, loc);
                  start_init (omp_priv, NULL_TREE, 0, &richloc);
-                 struct c_expr init = c_parser_initializer (parser);
+                 struct c_expr init = c_parser_initializer (parser, omp_priv);
                  finish_init ();
                  finish_decl (omp_priv, loc, init.value,
                               init.original_type, NULL_TREE);

diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index 64fba7fafac7470ba230c7a55eb9ac6fda0c2f26..7569785988e298df855d7aa3ce4ff987a17c1974 100644 (file)
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -8240,6 +8240,14 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
              && !TYPE_REF_P (type))
            TREE_CONSTANT (decl) = 1;
        }
+      /* This is handled mostly by gimplify.cc, but we have to deal with
+        not warning about int x = x; as it is a GCC extension to turn off
+        this warning but only if warn_init_self is zero.  */
+      if (!DECL_EXTERNAL (decl)
+         && !TREE_STATIC (decl)
+         && decl == tree_strip_any_location_wrapper (init)
+         && !warn_init_self)
+       suppress_warning (decl, OPT_Winit_self);
     }
 
   if (flag_openmp

diff --git a/gcc/testsuite/c-c++-common/Winit-self1.c b/gcc/testsuite/c-c++-common/Winit-self1.c
new file mode 100644 (file)
index 0000000..740b83b
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/Winit-self1.c
@@ -0,0 +1,31 @@
+/* PR middle-end/102633 */
+/* { dg-do compile } */
+/* { dg-options "-Wuninitialized -Wno-init-self" } */
+
+int
+fn1 (void)
+{
+  int i = i;
+  return i;
+}
+
+int
+fn2 ()
+{
+  const int j = j;
+  return j;
+}
+
+int
+fn3 ()
+{
+  volatile int k = k;
+  return k;
+}
+
+int
+fn4 ()
+{
+  const volatile int l = l;
+  return l;
+}

diff --git a/gcc/testsuite/c-c++-common/Winit-self2.c b/gcc/testsuite/c-c++-common/Winit-self2.c
new file mode 100644 (file)
index 0000000..13aa9ef
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/Winit-self2.c
@@ -0,0 +1,31 @@
+/* PR middle-end/102633 */
+/* { dg-do compile } */
+/* { dg-options "-Wuninitialized -Winit-self" } */
+
+int
+fn1 (void)
+{
+  int i = i; /* { dg-warning "used uninitialized" } */
+  return i;
+}
+
+int
+fn2 ()
+{
+  const int j = j; /* { dg-warning "used uninitialized" } */
+  return j;
+}
+
+int
+fn3 ()
+{
+  volatile int k = k; /* { dg-warning "used uninitialized" } */
+  return k;
+}
+
+int
+fn4 ()
+{
+  const volatile int l = l; /* { dg-warning "used uninitialized" } */
+  return l;
+}