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-------------------------------------------------------------------------------
-- (C) Altran Praxis Limited
-------------------------------------------------------------------------------
--
-- The SPARK toolset is free software; you can redistribute it and/or modify it
-- under terms of the GNU General Public License as published by the Free
-- Software Foundation; either version 3, or (at your option) any later
-- version. The SPARK toolset is distributed in the hope that it will be
-- useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-- Public License for more details. You should have received a copy of the GNU
-- General Public License distributed with the SPARK toolset; see file
-- COPYING3. If not, go to http://www.gnu.org/licenses for a complete copy of
-- the license.
--
--=============================================================================
package body Heap
--158 refinement clause removed
is
--158 new procedure
procedure Initialize (TheHeap : out HeapRecord) is
begin
TheHeap.HighMark := Atom (0);
TheHeap.NextFreeAtom := Atom (0);
--# accept F, 23, TheHeap.ListOfAtoms, "Partial initialization" &
--# F, 602, TheHeap, TheHeap.ListOfAtoms, "Partial initialization";
TheHeap.ListOfAtoms (0).PointerA := 0;
TheHeap.ListOfAtoms (0).PointerB := 0;
end Initialize;
--------------------------------------------------------------------
procedure CreateAtom (TheHeap : in out HeapRecord;
NewAtom : out Atom;
Success : out Boolean) is
A : Atom;
begin
--160--new if part
if TheHeap.HighMark < Atom (ListLength) then
--haven't used up array yet
TheHeap.HighMark := TheHeap.HighMark + 1;
A := TheHeap.HighMark;
TheHeap.ListOfAtoms (A).PointerA := 0;
TheHeap.ListOfAtoms (A).PointerB := 0;
NewAtom := A;
Success := True;
elsif TheHeap.NextFreeAtom = 0 then
--160--if turned into elsif
--array and returned atoms in free list both used up
Success := False;
NewAtom := 0;
else
--array used up but there are atoms in the returned free list
A := TheHeap.NextFreeAtom;
TheHeap.NextFreeAtom := TheHeap.ListOfAtoms (TheHeap.NextFreeAtom).PointerA;
TheHeap.ListOfAtoms (A).PointerA := 0;
TheHeap.ListOfAtoms (A).PointerB := 0;
NewAtom := A;
Success := True;
end if;
end CreateAtom;
--------------------------------------------------------------------
procedure DisposeOfAtom (TheHeap : in out HeapRecord;
OldAtom : in Atom) is
begin
TheHeap.ListOfAtoms (OldAtom).PointerA := TheHeap.NextFreeAtom;
TheHeap.NextFreeAtom := OldAtom;
end DisposeOfAtom;
--------------------------------------------------------------------
function APointer (TheHeap : HeapRecord;
A : Atom) return Atom is
begin
return TheHeap.ListOfAtoms (A).PointerA;
end APointer;
--------------------------------------------------------------------
function BPointer (TheHeap : HeapRecord;
A : Atom) return Atom is
begin
return TheHeap.ListOfAtoms (A).PointerB;
end BPointer;
--------------------------------------------------------------------
function AValue (TheHeap : HeapRecord;
A : Atom) return HeapIndex.IndexType is
begin
return TheHeap.ListOfAtoms (A).ValueA;
end AValue;
--------------------------------------------------------------------
function BValue (TheHeap : HeapRecord;
A : Atom) return HeapIndex.IndexType is
begin
return TheHeap.ListOfAtoms (A).ValueB;
end BValue;
--------------------------------------------------------------------
procedure UpdateAPointer (TheHeap : in out HeapRecord;
A : in Atom;
Pointer : in Atom) is
begin
TheHeap.ListOfAtoms (A).PointerA := Pointer;
end UpdateAPointer;
--------------------------------------------------------------------
procedure UpdateBPointer (TheHeap : in out HeapRecord;
A : in Atom;
Pointer : in Atom) is
begin
TheHeap.ListOfAtoms (A).PointerB := Pointer;
end UpdateBPointer;
--------------------------------------------------------------------
procedure UpdateAValue (TheHeap : in out HeapRecord;
A : in Atom;
Value : in HeapIndex.IndexType) is
begin
TheHeap.ListOfAtoms (A).ValueA := Value;
end UpdateAValue;
--------------------------------------------------------------------
procedure UpdateBValue (TheHeap : in out HeapRecord;
A : in Atom;
Value : in HeapIndex.IndexType) is
begin
TheHeap.ListOfAtoms (A).ValueB := Value;
end UpdateBValue;
--------------------------------------------------------------------
--159 new function used in RefList
function IsNullPointer (A : Atom) return Boolean is
begin
return (A = 0);
end IsNullPointer;
end Heap;
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