[Ada] Compiler crash on decl. with limited aggregate and address clause

[Pierre-Marie de Rodat]

This patch fixes a compiler abort on an object declaration whose
expression is an aggregate, when the type of the object is limited and
the declaration is followed by an address clause for the declared
object.

Tested on x86_64-pc-linux-gnu, committed on trunk

2018-11-14  Ed Schonberg  <schonb...@adacore.com>

gcc/ada/

        * exp_ch3.adb: (Expand_N_Object_Declaration): If the expression
        is a limited aggregate its resolution is delayed until the
        object declaration is expanded.
        * sem_ch3.adb: (Analyze_Object_Declaration): If the expression
        is a limited aggregate and the declaration has a following
        address clause indicate that resolution of the aggregate (which
        must be built in place) must be delayed.

gcc/testsuite/

        * gnat.dg/limited_aggr.adb, gnat.dg/limited_aggr.ads: New
        testcase.
--- gcc/ada/exp_ch3.adb
+++ gcc/ada/exp_ch3.adb
@@ -6586,6 +6586,16 @@ package body Exp_Ch3 is
          --  thus avoid creating a temporary.
 
          if Is_Delayed_Aggregate (Expr_Q) then
+
+            --  An aggregate that must be built in place is not resolved
+            --  and expanded until the enclosing construct is expanded.
+            --  This will happen when the aggregqte is limited and the
+            --  declared object has a following address clause.
+
+            if Is_Limited_Type (Typ) and then not Analyzed (Expr) then
+               Resolve (Expr, Typ);
+            end if;
+
             Convert_Aggr_In_Object_Decl (N);
 
          --  Ada 2005 (AI-318-02): If the initialization expression is a call
@@ -7022,7 +7032,7 @@ package body Exp_Ch3 is
                --  Given that the type is limited we cannot perform a copy. If
                --  Expr_Q is the reference to a variable we mark the variable
                --  as OK_To_Rename to expand this declaration into a renaming
-               --  declaration (see bellow).
+               --  declaration (see below).
 
                if Is_Entity_Name (Expr_Q) then
                   Set_OK_To_Rename (Entity (Expr_Q));

--- gcc/ada/sem_ch3.adb
+++ gcc/ada/sem_ch3.adb
@@ -4283,6 +4283,14 @@ package body Sem_Ch3 is
          then
             Set_Etype (E, T);
 
+            --  If the aggregate is limited it will be built in place,
+            --  and its expansion is deferred until the object declaration
+            --  is expanded.
+
+            if Is_Limited_Type (T) then
+               Set_Expansion_Delayed (E);
+            end if;
+
          else
 
             --  If the expression is a formal that is a "subprogram pointer"

--- /dev/null
new file mode 100644
+++ gcc/testsuite/gnat.dg/limited_aggr.adb
@@ -0,0 +1,5 @@
+--  { dg-do compile }
+
+package body Limited_Aggr is
+   procedure Dummy is null;
+end Limited_Aggr;

--- /dev/null
new file mode 100644
+++ gcc/testsuite/gnat.dg/limited_aggr.ads
@@ -0,0 +1,10 @@
+package Limited_Aggr is
+   type R is limited record
+      F1, F2 : Integer;
+   end record;
+   X : array (1..2) of integer;
+   Y : R := (-111, -222);
+   for Y'Address use X'Address;
+
+   procedure Dummy;
+end Limited_Aggr;