re PR c++/69257 (g++ ICE in "create_tmp_var" on invalid inline-asm)

PR c++/69257
	* typeck.c (decay_conversion): Don't call mark_rvalue_use for
	array/function-to-pointer conversion.  Call
	complete_type_or_maybe_complain for lvalue-to-rvalue conversion.
	* call.c (convert_like_real): Print call context if
	decay_conversion errors.

From-SVN: r232436

gcc/cp/ChangeLog

@@ -1,3 +1,12 @@
+2016-01-15  Jason Merrill  <jason@redhat.com>
+
+	PR c++/69257
+	* typeck.c (decay_conversion): Don't call mark_rvalue_use for
+	array/function-to-pointer conversion.  Call
+	complete_type_or_maybe_complain for lvalue-to-rvalue conversion.
+	* call.c (convert_like_real): Print call context if
+	decay_conversion errors.
+
 2016-01-14  Tom de Vries  <tom@codesourcery.com>
 
 	PR tree-optimization/68773

gcc/cp/call.c

@@ -6542,7 +6542,16 @@ convert_like_real (conversion *convs, tree expr, tree fn, int argnum,
     case ck_rvalue:
       expr = decay_conversion (expr, complain);
       if (expr == error_mark_node)
-	return error_mark_node;
+	{
+	  if (complain)
+	    {
+	      maybe_print_user_conv_context (convs);
+	      if (fn)
+		inform (DECL_SOURCE_LOCATION (fn),
+			"  initializing argument %P of %qD", argnum, fn);
+	    }
+	  return error_mark_node;
+	}
 
       if (! MAYBE_CLASS_TYPE_P (totype))
 	return expr;

gcc/cp/typeck.c

@@ -1909,11 +1909,10 @@ unlowered_expr_type (const_tree exp)
 
 /* Perform the conversions in [expr] that apply when an lvalue appears
    in an rvalue context: the lvalue-to-rvalue, array-to-pointer, and
-   function-to-pointer conversions.  In addition, manifest constants
+   function-to-pointer conversions.  In addition, bitfield references are
-   are replaced by their values, and bitfield references are converted
+   converted to their declared types. Note that this function does not perform
-   to their declared types. Note that this function does not perform the
+   the lvalue-to-rvalue conversion for class types. If you need that conversion
-   lvalue-to-rvalue conversion for class types. If you need that conversion
+   for class types, then you probably need to use force_rvalue.
-   to for class types, then you probably need to use force_rvalue.
 
    Although the returned value is being used as an rvalue, this
    function does not wrap the returned expression in a
@@ -1933,8 +1932,6 @@ decay_conversion (tree exp,
   if (type == error_mark_node)
     return error_mark_node;
 
-  exp = mark_rvalue_use (exp, loc, reject_builtin);
-
   exp = resolve_nondeduced_context (exp);
   if (type_unknown_p (exp))
     {
@@ -1962,12 +1959,19 @@ decay_conversion (tree exp,
   if (invalid_nonstatic_memfn_p (loc, exp, complain))
     return error_mark_node;
   if (code == FUNCTION_TYPE || is_overloaded_fn (exp))
-    return cp_build_addr_expr (exp, complain);
+    {
+      exp = mark_lvalue_use (exp);
+      if (reject_builtin && reject_gcc_builtin (exp, loc))
+	return error_mark_node;
+      return cp_build_addr_expr (exp, complain);
+    }
   if (code == ARRAY_TYPE)
     {
       tree adr;
       tree ptrtype;
 
+      exp = mark_lvalue_use (exp);
+
       if (INDIRECT_REF_P (exp))
 	return build_nop (build_pointer_type (TREE_TYPE (type)),
 			  TREE_OPERAND (exp, 0));
@@ -2013,6 +2017,9 @@ decay_conversion (tree exp,
       return cp_convert (ptrtype, adr, complain);
     }
 
+  /* Otherwise, it's the lvalue-to-rvalue conversion.  */
+  exp = mark_rvalue_use (exp, loc, reject_builtin);
+
   /* If a bitfield is used in a context where integral promotion
      applies, then the caller is expected to have used
      default_conversion.  That function promotes bitfields correctly
@@ -2032,6 +2039,9 @@ decay_conversion (tree exp,
   if (!CLASS_TYPE_P (type) && cv_qualified_p (type))
     exp = build_nop (cv_unqualified (type), exp);
 
+  if (!complete_type_or_maybe_complain (type, exp, complain))
+    return error_mark_node;
+
   return exp;
 }
 

gcc/testsuite/g++.dg/ext/asm13.C

@@ -0,0 +1,6 @@
+// PR c++/69257
+
+int fn1() {
+  struct S *x;
+  __asm ( "": :"" (*x));	// { dg-error "incomplete" }
+}