* [Ada] Crash on Image and Value attributes
@ 2019-07-08 8:19 Pierre-Marie de Rodat
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From: Pierre-Marie de Rodat @ 2019-07-08 8:19 UTC (permalink / raw)
To: gcc-patches; +Cc: Justin Squirek
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This patch fixes an issue whereby the creation of an enumeration within
package where Default_Scalar_Storage_Order is in effect may lead to a
crash when the attributes Image or Value are applied to objects of said
type or the type directly.
Tested on x86_64-pc-linux-gnu, committed on trunk
2019-07-08 Justin Squirek <squirek@adacore.com>
gcc/ada/
* exp_imgv.adb (Build_Enumeration_Image_Tables): Default SSO for
the building of image tables.
(Expand_Image_Attribute): Minor cleanup.
gcc/testsuite/
* gnat.dg/sso16.adb: New testcase.
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--- gcc/ada/exp_imgv.adb
+++ gcc/ada/exp_imgv.adb
@@ -69,18 +69,23 @@ package body Exp_Imgv is
------------------------------------
procedure Build_Enumeration_Image_Tables (E : Entity_Id; N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (E);
- Str : String_Id;
+ Loc : constant Source_Ptr := Sloc (E);
+
+ Eind : Entity_Id;
+ Estr : Entity_Id;
Ind : List_Id;
+ Ityp : Node_Id;
+ Len : Nat;
Lit : Entity_Id;
Nlit : Nat;
- Len : Nat;
- Estr : Entity_Id;
- Eind : Entity_Id;
- Ityp : Node_Id;
+ Str : String_Id;
+
+ Saved_SSO : constant Character := Opt.Default_SSO;
+ -- Used to save the current scalar storage order during the generation
+ -- of the literal lookup table.
begin
- -- Nothing to do for other than a root enumeration type
+ -- Nothing to do for types other than a root enumeration type
if E /= Root_Type (E) then
return;
@@ -138,6 +143,15 @@ package body Exp_Imgv is
Set_Lit_Strings (E, Estr);
Set_Lit_Indexes (E, Eind);
+ -- Temporarily set the current scalar storage order to the default
+ -- during the generation of the literals table, since both the Image and
+ -- Value attributes rely on runtime routines for interpreting table
+ -- values.
+
+ Opt.Default_SSO := ' ';
+
+ -- Generate literal table
+
Insert_Actions (N,
New_List (
Make_Object_Declaration (Loc,
@@ -168,6 +182,10 @@ package body Exp_Imgv is
Make_Aggregate (Loc,
Expressions => Ind))),
Suppress => All_Checks);
+
+ -- Reset the scalar storage order to the saved value
+
+ Opt.Default_SSO := Saved_SSO;
end Build_Enumeration_Image_Tables;
----------------------------
@@ -433,13 +451,13 @@ package body Exp_Imgv is
-- Local variables
+ Enum_Case : Boolean;
Imid : RE_Id;
+ Proc_Ent : Entity_Id;
Ptyp : Entity_Id;
Rtyp : Entity_Id;
Tent : Entity_Id := Empty;
Ttyp : Entity_Id;
- Proc_Ent : Entity_Id;
- Enum_Case : Boolean;
Arg_List : List_Id;
-- List of arguments for run-time procedure call
@@ -450,6 +468,8 @@ package body Exp_Imgv is
Snn : constant Entity_Id := Make_Temporary (Loc, 'S');
Pnn : constant Entity_Id := Make_Temporary (Loc, 'P');
+ -- Start of processing for Expand_Image_Attribute
+
begin
if Is_Object_Image (Pref) then
Rewrite_Object_Image (N, Pref, Name_Image, Standard_String);
--- /dev/null
new file mode 100644
+++ gcc/testsuite/gnat.dg/sso16.adb
@@ -0,0 +1,55 @@
+-- { dg-do run }
+
+with Ada.Text_IO; use Ada.Text_IO;
+
+procedure SSO16 is
+
+ pragma Default_Scalar_Storage_Order (High_Order_First);
+
+ type Enum_T is
+ (Event_0,
+ Event_1,
+ Event_2,
+ Event_3,
+ Event_4,
+ Event_5,
+ Event_11,
+ Event_12,
+ Event_13,
+ Event_14,
+ Event_15,
+ Event_21,
+ Event_22,
+ Event_23,
+ Event_24,
+ Event_25,
+ Event_31,
+ Event_32,
+ Event_33,
+ Event_34,
+ Event_35,
+ Event_41,
+ Event_42,
+ Event_43,
+ Event_44,
+ Event_45);
+
+ Var : Enum_T := Event_0;
+
+begin
+ if Var'Image /= "EVENT_0" then
+ raise Program_Error;
+ end if;
+
+ if Enum_T'Value ("Event_4")'Image /= "EVENT_4" then
+ raise Program_Error;
+ end if;
+
+ if Enum_T'Val (20)'Image /= "EVENT_35" then
+ raise Program_Error;
+ end if;
+
+ if Enum_T'Pos (Enum_T'Value ("Event_45"))'Image /= " 25" then
+ raise Program_Error;
+ end if;
+end;
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