------------------------------------------------------------------------------
|
------------------------------------------------------------------------------
|
-- --
|
-- --
|
-- GNAT COMPILER COMPONENTS --
|
-- GNAT COMPILER COMPONENTS --
|
-- --
|
-- --
|
-- S Y S T E M . S E C O N D A R Y _ S T A C K --
|
-- S Y S T E M . S E C O N D A R Y _ S T A C K --
|
-- --
|
-- --
|
-- B o d y --
|
-- B o d y --
|
-- --
|
-- --
|
-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
|
-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
|
-- --
|
-- --
|
-- GNAT is free software; you can redistribute it and/or modify it under --
|
-- 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- --
|
-- 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- --
|
-- 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- --
|
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
|
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
|
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
|
-- or FITNESS FOR A PARTICULAR PURPOSE. --
|
-- or FITNESS FOR A PARTICULAR PURPOSE. --
|
-- --
|
-- --
|
-- As a special exception under Section 7 of GPL version 3, you are granted --
|
-- As a special exception under Section 7 of GPL version 3, you are granted --
|
-- additional permissions described in the GCC Runtime Library Exception, --
|
-- additional permissions described in the GCC Runtime Library Exception, --
|
-- version 3.1, as published by the Free Software Foundation. --
|
-- version 3.1, as published by the Free Software Foundation. --
|
-- --
|
-- --
|
-- You should have received a copy of the GNU General Public License and --
|
-- 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; --
|
-- a copy of the GCC Runtime Library Exception along with this program; --
|
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
|
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
|
-- <http://www.gnu.org/licenses/>. --
|
-- <http://www.gnu.org/licenses/>. --
|
-- --
|
-- --
|
-- GNAT was originally developed by the GNAT team at New York University. --
|
-- GNAT was originally developed by the GNAT team at New York University. --
|
-- Extensive contributions were provided by Ada Core Technologies Inc. --
|
-- Extensive contributions were provided by Ada Core Technologies Inc. --
|
-- --
|
-- --
|
------------------------------------------------------------------------------
|
------------------------------------------------------------------------------
|
|
|
pragma Compiler_Unit;
|
pragma Compiler_Unit;
|
|
|
with System.Soft_Links;
|
with System.Soft_Links;
|
with System.Parameters;
|
with System.Parameters;
|
with Ada.Unchecked_Conversion;
|
with Ada.Unchecked_Conversion;
|
with Ada.Unchecked_Deallocation;
|
with Ada.Unchecked_Deallocation;
|
|
|
package body System.Secondary_Stack is
|
package body System.Secondary_Stack is
|
|
|
package SSL renames System.Soft_Links;
|
package SSL renames System.Soft_Links;
|
|
|
use type SSE.Storage_Offset;
|
use type SSE.Storage_Offset;
|
use type System.Parameters.Size_Type;
|
use type System.Parameters.Size_Type;
|
|
|
SS_Ratio_Dynamic : constant Boolean :=
|
SS_Ratio_Dynamic : constant Boolean :=
|
Parameters.Sec_Stack_Ratio = Parameters.Dynamic;
|
Parameters.Sec_Stack_Ratio = Parameters.Dynamic;
|
-- There are two entirely different implementations of the secondary
|
-- There are two entirely different implementations of the secondary
|
-- stack mechanism in this unit, and this Boolean is used to select
|
-- stack mechanism in this unit, and this Boolean is used to select
|
-- between them (at compile time, so the generated code will contain
|
-- between them (at compile time, so the generated code will contain
|
-- only the code for the desired variant). If SS_Ratio_Dynamic is
|
-- only the code for the desired variant). If SS_Ratio_Dynamic is
|
-- True, then the secondary stack is dynamically allocated from the
|
-- True, then the secondary stack is dynamically allocated from the
|
-- heap in a linked list of chunks. If SS_Ration_Dynamic is False,
|
-- heap in a linked list of chunks. If SS_Ration_Dynamic is False,
|
-- then the secondary stack is allocated statically by grabbing a
|
-- then the secondary stack is allocated statically by grabbing a
|
-- section of the primary stack and using it for this purpose.
|
-- section of the primary stack and using it for this purpose.
|
|
|
type Memory is array (SS_Ptr range <>) of SSE.Storage_Element;
|
type Memory is array (SS_Ptr range <>) of SSE.Storage_Element;
|
for Memory'Alignment use Standard'Maximum_Alignment;
|
for Memory'Alignment use Standard'Maximum_Alignment;
|
-- This is the type used for actual allocation of secondary stack
|
-- This is the type used for actual allocation of secondary stack
|
-- areas. We require maximum alignment for all such allocations.
|
-- areas. We require maximum alignment for all such allocations.
|
|
|
---------------------------------------------------------------
|
---------------------------------------------------------------
|
-- Data Structures for Dynamically Allocated Secondary Stack --
|
-- Data Structures for Dynamically Allocated Secondary Stack --
|
---------------------------------------------------------------
|
---------------------------------------------------------------
|
|
|
-- The following is a diagram of the data structures used for the
|
-- The following is a diagram of the data structures used for the
|
-- case of a dynamically allocated secondary stack, where the stack
|
-- case of a dynamically allocated secondary stack, where the stack
|
-- is allocated as a linked list of chunks allocated from the heap.
|
-- is allocated as a linked list of chunks allocated from the heap.
|
|
|
-- +------------------+
|
-- +------------------+
|
-- | Next |
|
-- | Next |
|
-- +------------------+
|
-- +------------------+
|
-- | | Last (200)
|
-- | | Last (200)
|
-- | |
|
-- | |
|
-- | |
|
-- | |
|
-- | |
|
-- | |
|
-- | |
|
-- | |
|
-- | |
|
-- | |
|
-- | | First (101)
|
-- | | First (101)
|
-- +------------------+
|
-- +------------------+
|
-- +----------> | | |
|
-- +----------> | | |
|
-- | +----------+-------+
|
-- | +----------+-------+
|
-- | | |
|
-- | | |
|
-- | ^ V
|
-- | ^ V
|
-- | | |
|
-- | | |
|
-- | +-------+----------+
|
-- | +-------+----------+
|
-- | | | |
|
-- | | | |
|
-- | +------------------+
|
-- | +------------------+
|
-- | | | Last (100)
|
-- | | | Last (100)
|
-- | | C |
|
-- | | C |
|
-- | | H |
|
-- | | H |
|
-- +-----------------+ | +-------->| U |
|
-- +-----------------+ | +-------->| U |
|
-- | Current_Chunk -|--+ | | N |
|
-- | Current_Chunk -|--+ | | N |
|
-- +-----------------+ | | K |
|
-- +-----------------+ | | K |
|
-- | Top -|-----+ | | First (1)
|
-- | Top -|-----+ | | First (1)
|
-- +-----------------+ +------------------+
|
-- +-----------------+ +------------------+
|
-- | Default_Size | | Prev |
|
-- | Default_Size | | Prev |
|
-- +-----------------+ +------------------+
|
-- +-----------------+ +------------------+
|
--
|
--
|
|
|
type Chunk_Id (First, Last : SS_Ptr);
|
type Chunk_Id (First, Last : SS_Ptr);
|
type Chunk_Ptr is access all Chunk_Id;
|
type Chunk_Ptr is access all Chunk_Id;
|
|
|
type Chunk_Id (First, Last : SS_Ptr) is record
|
type Chunk_Id (First, Last : SS_Ptr) is record
|
Prev, Next : Chunk_Ptr;
|
Prev, Next : Chunk_Ptr;
|
Mem : Memory (First .. Last);
|
Mem : Memory (First .. Last);
|
end record;
|
end record;
|
|
|
type Stack_Id is record
|
type Stack_Id is record
|
Top : SS_Ptr;
|
Top : SS_Ptr;
|
Default_Size : SSE.Storage_Count;
|
Default_Size : SSE.Storage_Count;
|
Current_Chunk : Chunk_Ptr;
|
Current_Chunk : Chunk_Ptr;
|
end record;
|
end record;
|
|
|
type Stack_Ptr is access Stack_Id;
|
type Stack_Ptr is access Stack_Id;
|
-- Pointer to record used to represent a dynamically allocated secondary
|
-- Pointer to record used to represent a dynamically allocated secondary
|
-- stack descriptor for a secondary stack chunk.
|
-- stack descriptor for a secondary stack chunk.
|
|
|
procedure Free is new Ada.Unchecked_Deallocation (Chunk_Id, Chunk_Ptr);
|
procedure Free is new Ada.Unchecked_Deallocation (Chunk_Id, Chunk_Ptr);
|
-- Free a dynamically allocated chunk
|
-- Free a dynamically allocated chunk
|
|
|
function To_Stack_Ptr is new
|
function To_Stack_Ptr is new
|
Ada.Unchecked_Conversion (Address, Stack_Ptr);
|
Ada.Unchecked_Conversion (Address, Stack_Ptr);
|
function To_Addr is new
|
function To_Addr is new
|
Ada.Unchecked_Conversion (Stack_Ptr, Address);
|
Ada.Unchecked_Conversion (Stack_Ptr, Address);
|
-- Convert to and from address stored in task data structures
|
-- Convert to and from address stored in task data structures
|
|
|
--------------------------------------------------------------
|
--------------------------------------------------------------
|
-- Data Structures for Statically Allocated Secondary Stack --
|
-- Data Structures for Statically Allocated Secondary Stack --
|
--------------------------------------------------------------
|
--------------------------------------------------------------
|
|
|
-- For the static case, the secondary stack is a single contiguous
|
-- For the static case, the secondary stack is a single contiguous
|
-- chunk of storage, carved out of the primary stack, and represented
|
-- chunk of storage, carved out of the primary stack, and represented
|
-- by the following data structure
|
-- by the following data structure
|
|
|
type Fixed_Stack_Id is record
|
type Fixed_Stack_Id is record
|
Top : SS_Ptr;
|
Top : SS_Ptr;
|
-- Index of next available location in Mem. This is initialized to
|
-- Index of next available location in Mem. This is initialized to
|
-- 0, and then incremented on Allocate, and Decremented on Release.
|
-- 0, and then incremented on Allocate, and Decremented on Release.
|
|
|
Last : SS_Ptr;
|
Last : SS_Ptr;
|
-- Length of usable Mem array, which is thus the index past the
|
-- Length of usable Mem array, which is thus the index past the
|
-- last available location in Mem. Mem (Last-1) can be used. This
|
-- last available location in Mem. Mem (Last-1) can be used. This
|
-- is used to check that the stack does not overflow.
|
-- is used to check that the stack does not overflow.
|
|
|
Max : SS_Ptr;
|
Max : SS_Ptr;
|
-- Maximum value of Top. Initialized to 0, and then may be incremented
|
-- Maximum value of Top. Initialized to 0, and then may be incremented
|
-- on Allocate, but is never Decremented. The last used location will
|
-- on Allocate, but is never Decremented. The last used location will
|
-- be Mem (Max - 1), so Max is the maximum count of used stack space.
|
-- be Mem (Max - 1), so Max is the maximum count of used stack space.
|
|
|
Mem : Memory (0 .. 0);
|
Mem : Memory (0 .. 0);
|
-- This is the area that is actually used for the secondary stack.
|
-- This is the area that is actually used for the secondary stack.
|
-- Note that the upper bound is a dummy value properly defined by
|
-- Note that the upper bound is a dummy value properly defined by
|
-- the value of Last. We never actually allocate objects of type
|
-- the value of Last. We never actually allocate objects of type
|
-- Fixed_Stack_Id, so the bounds declared here do not matter.
|
-- Fixed_Stack_Id, so the bounds declared here do not matter.
|
end record;
|
end record;
|
|
|
Dummy_Fixed_Stack : Fixed_Stack_Id;
|
Dummy_Fixed_Stack : Fixed_Stack_Id;
|
pragma Warnings (Off, Dummy_Fixed_Stack);
|
pragma Warnings (Off, Dummy_Fixed_Stack);
|
-- Well it is not quite true that we never allocate an object of the
|
-- Well it is not quite true that we never allocate an object of the
|
-- type. This dummy object is allocated for the purpose of getting the
|
-- type. This dummy object is allocated for the purpose of getting the
|
-- offset of the Mem field via the 'Position attribute (such a nuisance
|
-- offset of the Mem field via the 'Position attribute (such a nuisance
|
-- that we cannot apply this to a field of a type!)
|
-- that we cannot apply this to a field of a type!)
|
|
|
type Fixed_Stack_Ptr is access Fixed_Stack_Id;
|
type Fixed_Stack_Ptr is access Fixed_Stack_Id;
|
-- Pointer to record used to describe statically allocated sec stack
|
-- Pointer to record used to describe statically allocated sec stack
|
|
|
function To_Fixed_Stack_Ptr is new
|
function To_Fixed_Stack_Ptr is new
|
Ada.Unchecked_Conversion (Address, Fixed_Stack_Ptr);
|
Ada.Unchecked_Conversion (Address, Fixed_Stack_Ptr);
|
-- Convert from address stored in task data structures
|
-- Convert from address stored in task data structures
|
|
|
--------------
|
--------------
|
-- Allocate --
|
-- Allocate --
|
--------------
|
--------------
|
|
|
procedure SS_Allocate
|
procedure SS_Allocate
|
(Addr : out Address;
|
(Addr : out Address;
|
Storage_Size : SSE.Storage_Count)
|
Storage_Size : SSE.Storage_Count)
|
is
|
is
|
Max_Align : constant SS_Ptr := SS_Ptr (Standard'Maximum_Alignment);
|
Max_Align : constant SS_Ptr := SS_Ptr (Standard'Maximum_Alignment);
|
Max_Size : constant SS_Ptr :=
|
Max_Size : constant SS_Ptr :=
|
((SS_Ptr (Storage_Size) + Max_Align - 1) / Max_Align)
|
((SS_Ptr (Storage_Size) + Max_Align - 1) / Max_Align)
|
* Max_Align;
|
* Max_Align;
|
|
|
begin
|
begin
|
-- Case of fixed allocation secondary stack
|
-- Case of fixed allocation secondary stack
|
|
|
if not SS_Ratio_Dynamic then
|
if not SS_Ratio_Dynamic then
|
declare
|
declare
|
Fixed_Stack : constant Fixed_Stack_Ptr :=
|
Fixed_Stack : constant Fixed_Stack_Ptr :=
|
To_Fixed_Stack_Ptr (SSL.Get_Sec_Stack_Addr.all);
|
To_Fixed_Stack_Ptr (SSL.Get_Sec_Stack_Addr.all);
|
|
|
begin
|
begin
|
-- Check if max stack usage is increasing
|
-- Check if max stack usage is increasing
|
|
|
if Fixed_Stack.Top + Max_Size > Fixed_Stack.Max then
|
if Fixed_Stack.Top + Max_Size > Fixed_Stack.Max then
|
|
|
-- If so, check if max size is exceeded
|
-- If so, check if max size is exceeded
|
|
|
if Fixed_Stack.Top + Max_Size > Fixed_Stack.Last then
|
if Fixed_Stack.Top + Max_Size > Fixed_Stack.Last then
|
raise Storage_Error;
|
raise Storage_Error;
|
end if;
|
end if;
|
|
|
-- Record new max usage
|
-- Record new max usage
|
|
|
Fixed_Stack.Max := Fixed_Stack.Top + Max_Size;
|
Fixed_Stack.Max := Fixed_Stack.Top + Max_Size;
|
end if;
|
end if;
|
|
|
-- Set resulting address and update top of stack pointer
|
-- Set resulting address and update top of stack pointer
|
|
|
Addr := Fixed_Stack.Mem (Fixed_Stack.Top)'Address;
|
Addr := Fixed_Stack.Mem (Fixed_Stack.Top)'Address;
|
Fixed_Stack.Top := Fixed_Stack.Top + Max_Size;
|
Fixed_Stack.Top := Fixed_Stack.Top + Max_Size;
|
end;
|
end;
|
|
|
-- Case of dynamically allocated secondary stack
|
-- Case of dynamically allocated secondary stack
|
|
|
else
|
else
|
declare
|
declare
|
Stack : constant Stack_Ptr :=
|
Stack : constant Stack_Ptr :=
|
To_Stack_Ptr (SSL.Get_Sec_Stack_Addr.all);
|
To_Stack_Ptr (SSL.Get_Sec_Stack_Addr.all);
|
Chunk : Chunk_Ptr;
|
Chunk : Chunk_Ptr;
|
|
|
To_Be_Released_Chunk : Chunk_Ptr;
|
To_Be_Released_Chunk : Chunk_Ptr;
|
|
|
begin
|
begin
|
Chunk := Stack.Current_Chunk;
|
Chunk := Stack.Current_Chunk;
|
|
|
-- The Current_Chunk may not be the good one if a lot of release
|
-- The Current_Chunk may not be the good one if a lot of release
|
-- operations have taken place. So go down the stack if necessary
|
-- operations have taken place. So go down the stack if necessary
|
|
|
while Chunk.First > Stack.Top loop
|
while Chunk.First > Stack.Top loop
|
Chunk := Chunk.Prev;
|
Chunk := Chunk.Prev;
|
end loop;
|
end loop;
|
|
|
-- Find out if the available memory in the current chunk is
|
-- Find out if the available memory in the current chunk is
|
-- sufficient, if not, go to the next one and eventually create
|
-- sufficient, if not, go to the next one and eventually create
|
-- the necessary room.
|
-- the necessary room.
|
|
|
while Chunk.Last - Stack.Top + 1 < Max_Size loop
|
while Chunk.Last - Stack.Top + 1 < Max_Size loop
|
if Chunk.Next /= null then
|
if Chunk.Next /= null then
|
|
|
-- Release unused non-first empty chunk
|
-- Release unused non-first empty chunk
|
|
|
if Chunk.Prev /= null and then Chunk.First = Stack.Top then
|
if Chunk.Prev /= null and then Chunk.First = Stack.Top then
|
To_Be_Released_Chunk := Chunk;
|
To_Be_Released_Chunk := Chunk;
|
Chunk := Chunk.Prev;
|
Chunk := Chunk.Prev;
|
Chunk.Next := To_Be_Released_Chunk.Next;
|
Chunk.Next := To_Be_Released_Chunk.Next;
|
To_Be_Released_Chunk.Next.Prev := Chunk;
|
To_Be_Released_Chunk.Next.Prev := Chunk;
|
Free (To_Be_Released_Chunk);
|
Free (To_Be_Released_Chunk);
|
end if;
|
end if;
|
|
|
-- Create new chunk of default size unless it is not
|
-- Create new chunk of default size unless it is not
|
-- sufficient to satisfy the current request.
|
-- sufficient to satisfy the current request.
|
|
|
elsif SSE.Storage_Count (Max_Size) <= Stack.Default_Size then
|
elsif SSE.Storage_Count (Max_Size) <= Stack.Default_Size then
|
Chunk.Next :=
|
Chunk.Next :=
|
new Chunk_Id
|
new Chunk_Id
|
(First => Chunk.Last + 1,
|
(First => Chunk.Last + 1,
|
Last => Chunk.Last + SS_Ptr (Stack.Default_Size));
|
Last => Chunk.Last + SS_Ptr (Stack.Default_Size));
|
|
|
Chunk.Next.Prev := Chunk;
|
Chunk.Next.Prev := Chunk;
|
|
|
-- Otherwise create new chunk of requested size
|
-- Otherwise create new chunk of requested size
|
|
|
else
|
else
|
Chunk.Next :=
|
Chunk.Next :=
|
new Chunk_Id
|
new Chunk_Id
|
(First => Chunk.Last + 1,
|
(First => Chunk.Last + 1,
|
Last => Chunk.Last + Max_Size);
|
Last => Chunk.Last + Max_Size);
|
|
|
Chunk.Next.Prev := Chunk;
|
Chunk.Next.Prev := Chunk;
|
end if;
|
end if;
|
|
|
Chunk := Chunk.Next;
|
Chunk := Chunk.Next;
|
Stack.Top := Chunk.First;
|
Stack.Top := Chunk.First;
|
end loop;
|
end loop;
|
|
|
-- Resulting address is the address pointed by Stack.Top
|
-- Resulting address is the address pointed by Stack.Top
|
|
|
Addr := Chunk.Mem (Stack.Top)'Address;
|
Addr := Chunk.Mem (Stack.Top)'Address;
|
Stack.Top := Stack.Top + Max_Size;
|
Stack.Top := Stack.Top + Max_Size;
|
Stack.Current_Chunk := Chunk;
|
Stack.Current_Chunk := Chunk;
|
end;
|
end;
|
end if;
|
end if;
|
end SS_Allocate;
|
end SS_Allocate;
|
|
|
-------------
|
-------------
|
-- SS_Free --
|
-- SS_Free --
|
-------------
|
-------------
|
|
|
procedure SS_Free (Stk : in out Address) is
|
procedure SS_Free (Stk : in out Address) is
|
begin
|
begin
|
-- Case of statically allocated secondary stack, nothing to free
|
-- Case of statically allocated secondary stack, nothing to free
|
|
|
if not SS_Ratio_Dynamic then
|
if not SS_Ratio_Dynamic then
|
return;
|
return;
|
|
|
-- Case of dynamically allocated secondary stack
|
-- Case of dynamically allocated secondary stack
|
|
|
else
|
else
|
declare
|
declare
|
Stack : Stack_Ptr := To_Stack_Ptr (Stk);
|
Stack : Stack_Ptr := To_Stack_Ptr (Stk);
|
Chunk : Chunk_Ptr;
|
Chunk : Chunk_Ptr;
|
|
|
procedure Free is
|
procedure Free is
|
new Ada.Unchecked_Deallocation (Stack_Id, Stack_Ptr);
|
new Ada.Unchecked_Deallocation (Stack_Id, Stack_Ptr);
|
|
|
begin
|
begin
|
Chunk := Stack.Current_Chunk;
|
Chunk := Stack.Current_Chunk;
|
|
|
while Chunk.Prev /= null loop
|
while Chunk.Prev /= null loop
|
Chunk := Chunk.Prev;
|
Chunk := Chunk.Prev;
|
end loop;
|
end loop;
|
|
|
while Chunk.Next /= null loop
|
while Chunk.Next /= null loop
|
Chunk := Chunk.Next;
|
Chunk := Chunk.Next;
|
Free (Chunk.Prev);
|
Free (Chunk.Prev);
|
end loop;
|
end loop;
|
|
|
Free (Chunk);
|
Free (Chunk);
|
Free (Stack);
|
Free (Stack);
|
Stk := Null_Address;
|
Stk := Null_Address;
|
end;
|
end;
|
end if;
|
end if;
|
end SS_Free;
|
end SS_Free;
|
|
|
----------------
|
----------------
|
-- SS_Get_Max --
|
-- SS_Get_Max --
|
----------------
|
----------------
|
|
|
function SS_Get_Max return Long_Long_Integer is
|
function SS_Get_Max return Long_Long_Integer is
|
begin
|
begin
|
if SS_Ratio_Dynamic then
|
if SS_Ratio_Dynamic then
|
return -1;
|
return -1;
|
else
|
else
|
declare
|
declare
|
Fixed_Stack : constant Fixed_Stack_Ptr :=
|
Fixed_Stack : constant Fixed_Stack_Ptr :=
|
To_Fixed_Stack_Ptr (SSL.Get_Sec_Stack_Addr.all);
|
To_Fixed_Stack_Ptr (SSL.Get_Sec_Stack_Addr.all);
|
begin
|
begin
|
return Long_Long_Integer (Fixed_Stack.Max);
|
return Long_Long_Integer (Fixed_Stack.Max);
|
end;
|
end;
|
end if;
|
end if;
|
end SS_Get_Max;
|
end SS_Get_Max;
|
|
|
-------------
|
-------------
|
-- SS_Info --
|
-- SS_Info --
|
-------------
|
-------------
|
|
|
procedure SS_Info is
|
procedure SS_Info is
|
begin
|
begin
|
Put_Line ("Secondary Stack information:");
|
Put_Line ("Secondary Stack information:");
|
|
|
-- Case of fixed secondary stack
|
-- Case of fixed secondary stack
|
|
|
if not SS_Ratio_Dynamic then
|
if not SS_Ratio_Dynamic then
|
declare
|
declare
|
Fixed_Stack : constant Fixed_Stack_Ptr :=
|
Fixed_Stack : constant Fixed_Stack_Ptr :=
|
To_Fixed_Stack_Ptr (SSL.Get_Sec_Stack_Addr.all);
|
To_Fixed_Stack_Ptr (SSL.Get_Sec_Stack_Addr.all);
|
|
|
begin
|
begin
|
Put_Line (
|
Put_Line (
|
" Total size : "
|
" Total size : "
|
& SS_Ptr'Image (Fixed_Stack.Last)
|
& SS_Ptr'Image (Fixed_Stack.Last)
|
& " bytes");
|
& " bytes");
|
|
|
Put_Line (
|
Put_Line (
|
" Current allocated space : "
|
" Current allocated space : "
|
& SS_Ptr'Image (Fixed_Stack.Top - 1)
|
& SS_Ptr'Image (Fixed_Stack.Top - 1)
|
& " bytes");
|
& " bytes");
|
end;
|
end;
|
|
|
-- Case of dynamically allocated secondary stack
|
-- Case of dynamically allocated secondary stack
|
|
|
else
|
else
|
declare
|
declare
|
Stack : constant Stack_Ptr :=
|
Stack : constant Stack_Ptr :=
|
To_Stack_Ptr (SSL.Get_Sec_Stack_Addr.all);
|
To_Stack_Ptr (SSL.Get_Sec_Stack_Addr.all);
|
Nb_Chunks : Integer := 1;
|
Nb_Chunks : Integer := 1;
|
Chunk : Chunk_Ptr := Stack.Current_Chunk;
|
Chunk : Chunk_Ptr := Stack.Current_Chunk;
|
|
|
begin
|
begin
|
while Chunk.Prev /= null loop
|
while Chunk.Prev /= null loop
|
Chunk := Chunk.Prev;
|
Chunk := Chunk.Prev;
|
end loop;
|
end loop;
|
|
|
while Chunk.Next /= null loop
|
while Chunk.Next /= null loop
|
Nb_Chunks := Nb_Chunks + 1;
|
Nb_Chunks := Nb_Chunks + 1;
|
Chunk := Chunk.Next;
|
Chunk := Chunk.Next;
|
end loop;
|
end loop;
|
|
|
-- Current Chunk information
|
-- Current Chunk information
|
|
|
Put_Line (
|
Put_Line (
|
" Total size : "
|
" Total size : "
|
& SS_Ptr'Image (Chunk.Last)
|
& SS_Ptr'Image (Chunk.Last)
|
& " bytes");
|
& " bytes");
|
|
|
Put_Line (
|
Put_Line (
|
" Current allocated space : "
|
" Current allocated space : "
|
& SS_Ptr'Image (Stack.Top - 1)
|
& SS_Ptr'Image (Stack.Top - 1)
|
& " bytes");
|
& " bytes");
|
|
|
Put_Line (
|
Put_Line (
|
" Number of Chunks : "
|
" Number of Chunks : "
|
& Integer'Image (Nb_Chunks));
|
& Integer'Image (Nb_Chunks));
|
|
|
Put_Line (
|
Put_Line (
|
" Default size of Chunks : "
|
" Default size of Chunks : "
|
& SSE.Storage_Count'Image (Stack.Default_Size));
|
& SSE.Storage_Count'Image (Stack.Default_Size));
|
end;
|
end;
|
end if;
|
end if;
|
end SS_Info;
|
end SS_Info;
|
|
|
-------------
|
-------------
|
-- SS_Init --
|
-- SS_Init --
|
-------------
|
-------------
|
|
|
procedure SS_Init
|
procedure SS_Init
|
(Stk : in out Address;
|
(Stk : in out Address;
|
Size : Natural := Default_Secondary_Stack_Size)
|
Size : Natural := Default_Secondary_Stack_Size)
|
is
|
is
|
begin
|
begin
|
-- Case of fixed size secondary stack
|
-- Case of fixed size secondary stack
|
|
|
if not SS_Ratio_Dynamic then
|
if not SS_Ratio_Dynamic then
|
declare
|
declare
|
Fixed_Stack : constant Fixed_Stack_Ptr :=
|
Fixed_Stack : constant Fixed_Stack_Ptr :=
|
To_Fixed_Stack_Ptr (Stk);
|
To_Fixed_Stack_Ptr (Stk);
|
|
|
begin
|
begin
|
Fixed_Stack.Top := 0;
|
Fixed_Stack.Top := 0;
|
Fixed_Stack.Max := 0;
|
Fixed_Stack.Max := 0;
|
|
|
if Size < Dummy_Fixed_Stack.Mem'Position then
|
if Size < Dummy_Fixed_Stack.Mem'Position then
|
Fixed_Stack.Last := 0;
|
Fixed_Stack.Last := 0;
|
else
|
else
|
Fixed_Stack.Last :=
|
Fixed_Stack.Last :=
|
SS_Ptr (Size) - Dummy_Fixed_Stack.Mem'Position;
|
SS_Ptr (Size) - Dummy_Fixed_Stack.Mem'Position;
|
end if;
|
end if;
|
end;
|
end;
|
|
|
-- Case of dynamically allocated secondary stack
|
-- Case of dynamically allocated secondary stack
|
|
|
else
|
else
|
declare
|
declare
|
Stack : Stack_Ptr;
|
Stack : Stack_Ptr;
|
begin
|
begin
|
Stack := new Stack_Id;
|
Stack := new Stack_Id;
|
Stack.Current_Chunk := new Chunk_Id (1, SS_Ptr (Size));
|
Stack.Current_Chunk := new Chunk_Id (1, SS_Ptr (Size));
|
Stack.Top := 1;
|
Stack.Top := 1;
|
Stack.Default_Size := SSE.Storage_Count (Size);
|
Stack.Default_Size := SSE.Storage_Count (Size);
|
Stk := To_Addr (Stack);
|
Stk := To_Addr (Stack);
|
end;
|
end;
|
end if;
|
end if;
|
end SS_Init;
|
end SS_Init;
|
|
|
-------------
|
-------------
|
-- SS_Mark --
|
-- SS_Mark --
|
-------------
|
-------------
|
|
|
function SS_Mark return Mark_Id is
|
function SS_Mark return Mark_Id is
|
Sstk : constant System.Address := SSL.Get_Sec_Stack_Addr.all;
|
Sstk : constant System.Address := SSL.Get_Sec_Stack_Addr.all;
|
begin
|
begin
|
if SS_Ratio_Dynamic then
|
if SS_Ratio_Dynamic then
|
return (Sstk => Sstk, Sptr => To_Stack_Ptr (Sstk).Top);
|
return (Sstk => Sstk, Sptr => To_Stack_Ptr (Sstk).Top);
|
else
|
else
|
return (Sstk => Sstk, Sptr => To_Fixed_Stack_Ptr (Sstk).Top);
|
return (Sstk => Sstk, Sptr => To_Fixed_Stack_Ptr (Sstk).Top);
|
end if;
|
end if;
|
end SS_Mark;
|
end SS_Mark;
|
|
|
----------------
|
----------------
|
-- SS_Release --
|
-- SS_Release --
|
----------------
|
----------------
|
|
|
procedure SS_Release (M : Mark_Id) is
|
procedure SS_Release (M : Mark_Id) is
|
begin
|
begin
|
if SS_Ratio_Dynamic then
|
if SS_Ratio_Dynamic then
|
To_Stack_Ptr (M.Sstk).Top := M.Sptr;
|
To_Stack_Ptr (M.Sstk).Top := M.Sptr;
|
else
|
else
|
To_Fixed_Stack_Ptr (M.Sstk).Top := M.Sptr;
|
To_Fixed_Stack_Ptr (M.Sstk).Top := M.Sptr;
|
end if;
|
end if;
|
end SS_Release;
|
end SS_Release;
|
|
|
-------------------------
|
-------------------------
|
-- Package Elaboration --
|
-- Package Elaboration --
|
-------------------------
|
-------------------------
|
|
|
-- Allocate a secondary stack for the main program to use
|
-- Allocate a secondary stack for the main program to use
|
|
|
-- We make sure that the stack has maximum alignment. Some systems require
|
-- We make sure that the stack has maximum alignment. Some systems require
|
-- this (e.g. Sparc), and in any case it is a good idea for efficiency.
|
-- this (e.g. Sparc), and in any case it is a good idea for efficiency.
|
|
|
Stack : aliased Stack_Id;
|
Stack : aliased Stack_Id;
|
for Stack'Alignment use Standard'Maximum_Alignment;
|
for Stack'Alignment use Standard'Maximum_Alignment;
|
|
|
Static_Secondary_Stack_Size : constant := 10 * 1024;
|
Static_Secondary_Stack_Size : constant := 10 * 1024;
|
-- Static_Secondary_Stack_Size must be static so that Chunk is allocated
|
-- Static_Secondary_Stack_Size must be static so that Chunk is allocated
|
-- statically, and not via dynamic memory allocation.
|
-- statically, and not via dynamic memory allocation.
|
|
|
Chunk : aliased Chunk_Id (1, Static_Secondary_Stack_Size);
|
Chunk : aliased Chunk_Id (1, Static_Secondary_Stack_Size);
|
for Chunk'Alignment use Standard'Maximum_Alignment;
|
for Chunk'Alignment use Standard'Maximum_Alignment;
|
-- Default chunk used, unless gnatbind -D is specified with a value
|
-- Default chunk used, unless gnatbind -D is specified with a value
|
-- greater than Static_Secondary_Stack_Size
|
-- greater than Static_Secondary_Stack_Size
|
|
|
begin
|
begin
|
declare
|
declare
|
Chunk_Address : Address;
|
Chunk_Address : Address;
|
Chunk_Access : Chunk_Ptr;
|
Chunk_Access : Chunk_Ptr;
|
|
|
begin
|
begin
|
if Default_Secondary_Stack_Size <= Static_Secondary_Stack_Size then
|
if Default_Secondary_Stack_Size <= Static_Secondary_Stack_Size then
|
|
|
-- Normally we allocate the secondary stack for the main program
|
-- Normally we allocate the secondary stack for the main program
|
-- statically, using the default secondary stack size.
|
-- statically, using the default secondary stack size.
|
|
|
Chunk_Access := Chunk'Access;
|
Chunk_Access := Chunk'Access;
|
|
|
else
|
else
|
-- Default_Secondary_Stack_Size was increased via gnatbind -D, so we
|
-- Default_Secondary_Stack_Size was increased via gnatbind -D, so we
|
-- need to allocate a chunk dynamically.
|
-- need to allocate a chunk dynamically.
|
|
|
Chunk_Access :=
|
Chunk_Access :=
|
new Chunk_Id (1, SS_Ptr (Default_Secondary_Stack_Size));
|
new Chunk_Id (1, SS_Ptr (Default_Secondary_Stack_Size));
|
end if;
|
end if;
|
|
|
if SS_Ratio_Dynamic then
|
if SS_Ratio_Dynamic then
|
Stack.Top := 1;
|
Stack.Top := 1;
|
Stack.Current_Chunk := Chunk_Access;
|
Stack.Current_Chunk := Chunk_Access;
|
Stack.Default_Size :=
|
Stack.Default_Size :=
|
SSE.Storage_Offset (Default_Secondary_Stack_Size);
|
SSE.Storage_Offset (Default_Secondary_Stack_Size);
|
System.Soft_Links.Set_Sec_Stack_Addr_NT (Stack'Address);
|
System.Soft_Links.Set_Sec_Stack_Addr_NT (Stack'Address);
|
|
|
else
|
else
|
Chunk_Address := Chunk_Access.all'Address;
|
Chunk_Address := Chunk_Access.all'Address;
|
SS_Init (Chunk_Address, Default_Secondary_Stack_Size);
|
SS_Init (Chunk_Address, Default_Secondary_Stack_Size);
|
System.Soft_Links.Set_Sec_Stack_Addr_NT (Chunk_Address);
|
System.Soft_Links.Set_Sec_Stack_Addr_NT (Chunk_Address);
|
end if;
|
end if;
|
end;
|
end;
|
end System.Secondary_Stack;
|
end System.Secondary_Stack;
|
|
|