From: Eric Botcazou <ebotca...@adacore.com>
When an access type is subject to the No_Heap_Finalization pragma, no header
is added in front of objects allocated through it, and the value returned by
Finalization_Size is defined to be the size of this header.
gcc/ada/
* exp_attr.adb (Expand_N_Attribute_Reference) <Finalization_Size>:
Return 0 if the prefix is a dereference of an access value subject
to the No_Heap_Finalization pragma.
Tested on x86_64-pc-linux-gnu, committed on master.
---
gcc/ada/exp_attr.adb | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/gcc/ada/exp_attr.adb b/gcc/ada/exp_attr.adb
index 614f1fbe14d..a8e06f0005e 100644
--- a/gcc/ada/exp_attr.adb
+++ b/gcc/ada/exp_attr.adb
@@ -3563,6 +3563,14 @@ package body Exp_Attr is
-- Start of processing for Finalization_Size
begin
+ -- If the prefix is the dereference of an access value subject to
+ -- pragma No_Heap_Finalization, then no header has been added.
+
+ if Nkind (Pref) = N_Explicit_Dereference
+ and then No_Heap_Finalization (Etype (Prefix (Pref)))
+ then
+ Rewrite (N, Make_Integer_Literal (Loc, 0));
+
-- An object of a class-wide type first requires a runtime check to
-- determine whether it is actually controlled or not. Depending on
-- the outcome of this check, the Finalization_Size of the object
@@ -3578,7 +3586,7 @@ package body Exp_Attr is
--
-- and the attribute reference is replaced with a reference to Size.
- if Is_Class_Wide_Type (Ptyp) then
+ elsif Is_Class_Wide_Type (Ptyp) then
Size := Make_Temporary (Loc, 'S');
Insert_Actions (N, New_List (
--
2.43.2
