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/*
Title: Validate addresses in objects.
Copyright (c) 2006
David C.J. Matthews
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef WIN32
#include "winconfig.h"
#else
#include "config.h"
#endif
#ifdef HAVE_ASSERT_H
#include <assert.h>
#define ASSERT(x) assert(x)
#else
#define ASSERT(x)
#endif
#include "globals.h"
#include "diagnostics.h"
#include "machine_dep.h"
#include "scanaddrs.h"
#include "memmgr.h"
#define INRANGE(val,start,end)\
(start <= val && val < end)
static void CheckAddress(const void *pt)
{
if (gMem.SpaceForAddress(pt) == 0)
Crash ("Bad pointer 0x%08x found", pt);
}
void DoCheck (const PolyWord pt)
{
if (pt == PolyWord::FromUnsigned(0)) return;
if (pt.IsTagged()) return;
/* Test corrected 20/2/95 - the stack contains code pointers
(for return addresses) as well as simple data pointers */
ASSERT (pt.IsCodePtr() || pt.IsDataPtr());
CheckAddress(pt.AsAddress());
}
class ScanCheckAddress: public ScanAddress
{
public:
virtual PolyObject *ScanObjectAddress(PolyObject *pt) { DoCheck(pt); return pt; }
};
void DoCheckObject (const PolyObject *base, POLYUNSIGNED L)
{
PolyWord *pt = (PolyWord*)base;
CheckAddress(pt-1);
ASSERT (OBJ_IS_LENGTH(L));
POLYUNSIGNED n = OBJ_OBJECT_LENGTH(L);
if (n == 0) return;
ASSERT (n > 0);
PolyWord *end = pt + n;
CheckAddress (end-1);
byte flags = GetTypeBits(L); /* discards GC flag and mutable bit */
if (flags == F_BYTE_OBJ) /* possibly signed byte object */
return; /* Nothing more to do */
if (flags == F_STACK_OBJ)
{
StackObject *stack = (StackObject *) base;
POLYUNSIGNED skip = stack->p_sp - (PolyWord*)base;
ASSERT (INRANGE(stack->p_sp, (PolyWord*)base, (PolyWord*)end));
ASSERT (INRANGE(stack->p_hr, (PolyWord*)base, (PolyWord*)end));
/* Skip to the start of the stack. */
ASSERT (skip < n);
pt += skip;
n -= skip;
}
else if (flags == F_CODE_OBJ) /* code object */
{
ScanCheckAddress checkAddr;
/* We flush the instruction cache here in case we change any of the
instructions when we update addresses. */
machineDependent->FlushInstructionCache(pt, (n + 1) * sizeof(PolyWord));
machineDependent->ScanConstantsWithinCode((PolyObject *)base, (PolyObject *)base, n, &checkAddr);
/* Skip to the constants. */
base->GetConstSegmentForCode(n, pt, n);
}
else ASSERT (flags == 0); /* ordinary word object */
while (n--) DoCheck (*pt++);
}
void DoCheckPointer (const PolyWord pt)
{
if (pt == PolyWord::FromUnsigned(0)) return;
if (OBJ_IS_AN_INTEGER(pt)) return;
if (gMem.IsIOPointer(pt.AsAddress())) return;
DoCheck (pt);
if (pt.IsDataPtr())
{
PolyObject *obj = pt.AsObjPtr();
DoCheckObject (obj, obj->LengthWord());
}
}
// Check all the objects in the memory. Used to check the garbage collector
//
void DoCheckMemory()
{
ScanCheckAddress memCheck;
// Scan the local mutable area. This is where new objects are created.
// The immutable areas are only modified by the GC.
for (unsigned i = 0; i < gMem.nlSpaces; i++)
{
LocalMemSpace *space = gMem.lSpaces[i];
if (space->isMutable)
memCheck.ScanAddressesInRegion(space->pointer, space->top);
}
// Scan the permanent mutable areas.
for (unsigned j = 0; j < gMem.npSpaces; j++)
{
MemSpace *space = gMem.pSpaces[j];
if (space->isMutable)
memCheck.ScanAddressesInRegion(space->bottom, space->top);
}
}
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