| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . R E T U R N _ S T A C K -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 2022, Free Software Foundation, Inc. -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This small package provides direct access to the return stack of the code |
| -- generator for functions returning a by-reference type. This return stack |
| -- is the portion of the primary stack that has been allocated by callers of |
| -- the functions and onto which the functions put the result before returning. |
| |
| with System.Storage_Elements; |
| |
| package System.Return_Stack is |
| pragma Preelaborate; |
| |
| package SSE renames System.Storage_Elements; |
| |
| procedure RS_Allocate |
| (Addr : out Address; |
| Storage_Size : SSE.Storage_Count); |
| pragma Import (Intrinsic, RS_Allocate, "__builtin_return_slot"); |
| -- Allocate enough space on the return stack of the invoking task to |
| -- accommodate a return of size Storage_Size. Return the address of the |
| -- first byte of the allocation in Addr. |
| |
| private |
| RS_Pool : Integer; |
| -- Unused entity that is just present to ease the sharing of the pool |
| -- mechanism for specific allocation/deallocation in the compiler. |
| |
| end System.Return_Stack; |
