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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef SCI_ENGINE_SEGMENT_H
#define SCI_ENGINE_SEGMENT_H
#include "common/serializer.h"
#include "sci/engine/object.h"
#include "sci/engine/vm.h"
#include "sci/engine/vm_types.h" // for reg_t
#include "sci/util.h"
namespace Sci {
struct SegmentRef {
bool isRaw; ///< true if data is raw, false if it is a reg_t sequence
union {
byte *raw;
reg_t *reg;
};
int maxSize; ///< number of available bytes
// FIXME: Perhaps a generic 'offset' is more appropriate here
bool skipByte; ///< true if referencing the 2nd data byte of *reg, false otherwise
// TODO: Add this?
//reg_t pointer; // Original pointer
// TODO: Add this?
//SegmentType type;
SegmentRef() : isRaw(true), raw(0), maxSize(0), skipByte(false) {}
bool isValid() const { return (isRaw ? raw != 0 : reg != 0); }
};
enum SegmentType {
SEG_TYPE_INVALID = 0,
SEG_TYPE_SCRIPT = 1,
SEG_TYPE_CLONES = 2,
SEG_TYPE_LOCALS = 3,
SEG_TYPE_STACK = 4,
// 5 used to be system strings, now obsolete
SEG_TYPE_LISTS = 6,
SEG_TYPE_NODES = 7,
SEG_TYPE_HUNK = 8,
SEG_TYPE_DYNMEM = 9,
// 10 used to be string fragments, now obsolete
#ifdef ENABLE_SCI32
SEG_TYPE_ARRAY = 11,
SEG_TYPE_STRING = 12,
#endif
SEG_TYPE_MAX // For sanity checking
};
struct SegmentObj : public Common::Serializable {
SegmentType _type;
public:
static SegmentObj *createSegmentObj(SegmentType type);
public:
SegmentObj(SegmentType type) : _type(type) {}
virtual ~SegmentObj() {}
inline SegmentType getType() const { return _type; }
/**
* Check whether the given offset into this memory object is valid,
* i.e., suitable for passing to dereference.
*/
virtual bool isValidOffset(uint16 offset) const = 0;
/**
* Dereferences a raw memory pointer.
* @param reg reference to dereference
* @return the data block referenced
*/
virtual SegmentRef dereference(reg_t pointer);
/**
* Finds the canonic address associated with sub_reg.
* Used by the garbage collector.
*
* For each valid address a, there exists a canonic address c(a) such that c(a) = c(c(a)).
* This address "governs" a in the sense that deallocating c(a) will deallocate a.
*
* @param sub_addr base address whose canonic address is to be found
*/
virtual reg_t findCanonicAddress(SegManager *segMan, reg_t sub_addr) const { return sub_addr; }
/**
* Deallocates all memory associated with the specified address.
* Used by the garbage collector.
* @param sub_addr address (within the given segment) to deallocate
*/
virtual void freeAtAddress(SegManager *segMan, reg_t sub_addr) {}
/**
* Iterates over and reports all addresses within the segment.
* Used by the garbage collector.
* @return a list of addresses within the segment
*/
virtual Common::Array<reg_t> listAllDeallocatable(SegmentId segId) const {
return Common::Array<reg_t>();
}
/**
* Iterates over all references reachable from the specified object.
* Used by the garbage collector.
* @param object object (within the current segment) to analyze
* @return a list of outgoing references within the object
*
* @note This function may also choose to report numbers (segment 0) as adresses
*/
virtual Common::Array<reg_t> listAllOutgoingReferences(reg_t object) const {
return Common::Array<reg_t>();
}
};
struct LocalVariables : public SegmentObj {
int script_id; /**< Script ID this local variable block belongs to */
Common::Array<reg_t> _locals;
public:
LocalVariables(): SegmentObj(SEG_TYPE_LOCALS), script_id(0) { }
virtual bool isValidOffset(uint16 offset) const {
return offset < _locals.size() * 2;
}
virtual SegmentRef dereference(reg_t pointer);
virtual reg_t findCanonicAddress(SegManager *segMan, reg_t sub_addr) const;
virtual Common::Array<reg_t> listAllOutgoingReferences(reg_t object) const;
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
/** Data stack */
struct DataStack : SegmentObj {
int _capacity; /**< Number of stack entries */
reg_t *_entries;
public:
DataStack() : SegmentObj(SEG_TYPE_STACK), _capacity(0), _entries(NULL) { }
~DataStack() {
free(_entries);
_entries = NULL;
}
virtual bool isValidOffset(uint16 offset) const {
return offset < _capacity * 2;
}
virtual SegmentRef dereference(reg_t pointer);
virtual reg_t findCanonicAddress(SegManager *segMan, reg_t addr) const {
return make_reg(addr.getSegment(), 0);
}
virtual Common::Array<reg_t> listAllOutgoingReferences(reg_t object) const;
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
enum {
CLONE_USED = -1,
CLONE_NONE = -1
};
typedef Object Clone;
struct Node {
reg_t pred; /**< Predecessor node */
reg_t succ; /**< Successor node */
reg_t key;
reg_t value;
}; /* List nodes */
struct List {
reg_t first;
reg_t last;
};
struct Hunk {
void *mem;
uint32 size;
const char *type;
};
template<typename T>
struct SegmentObjTable : public SegmentObj {
typedef T value_type;
struct Entry {
T data;
int next_free; /* Only used for free entries */
};
enum { HEAPENTRY_INVALID = -1 };
int first_free; /**< Beginning of a singly linked list for entries */
int entries_used; /**< Statistical information */
typedef Common::Array<Entry> ArrayType;
ArrayType _table;
public:
SegmentObjTable(SegmentType type) : SegmentObj(type) {
initTable();
}
void initTable() {
entries_used = 0;
first_free = HEAPENTRY_INVALID;
_table.clear();
}
int allocEntry() {
entries_used++;
if (first_free != HEAPENTRY_INVALID) {
int oldff = first_free;
first_free = _table[oldff].next_free;
_table[oldff].next_free = oldff;
return oldff;
} else {
uint newIdx = _table.size();
_table.push_back(Entry());
_table[newIdx].next_free = newIdx; // Tag as 'valid'
return newIdx;
}
}
virtual bool isValidOffset(uint16 offset) const {
return isValidEntry(offset);
}
bool isValidEntry(int idx) const {
return idx >= 0 && (uint)idx < _table.size() && _table[idx].next_free == idx;
}
virtual void freeEntry(int idx) {
if (idx < 0 || (uint)idx >= _table.size())
::error("Table::freeEntry: Attempt to release invalid table index %d", idx);
_table[idx].next_free = first_free;
first_free = idx;
entries_used--;
}
virtual Common::Array<reg_t> listAllDeallocatable(SegmentId segId) const {
Common::Array<reg_t> tmp;
for (uint i = 0; i < _table.size(); i++)
if (isValidEntry(i))
tmp.push_back(make_reg(segId, i));
return tmp;
}
uint size() const { return _table.size(); }
T &at(uint index) { return _table[index].data; }
const T &at(uint index) const { return _table[index].data; }
T &operator[](uint index) { return at(index); }
const T &operator[](uint index) const { return at(index); }
};
/* CloneTable */
struct CloneTable : public SegmentObjTable<Clone> {
CloneTable() : SegmentObjTable<Clone>(SEG_TYPE_CLONES) {}
virtual void freeAtAddress(SegManager *segMan, reg_t sub_addr);
virtual Common::Array<reg_t> listAllOutgoingReferences(reg_t object) const;
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
/* NodeTable */
struct NodeTable : public SegmentObjTable<Node> {
NodeTable() : SegmentObjTable<Node>(SEG_TYPE_NODES) {}
virtual void freeAtAddress(SegManager *segMan, reg_t sub_addr) {
freeEntry(sub_addr.getOffset());
}
virtual Common::Array<reg_t> listAllOutgoingReferences(reg_t object) const;
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
/* ListTable */
struct ListTable : public SegmentObjTable<List> {
ListTable() : SegmentObjTable<List>(SEG_TYPE_LISTS) {}
virtual void freeAtAddress(SegManager *segMan, reg_t sub_addr) {
freeEntry(sub_addr.getOffset());
}
virtual Common::Array<reg_t> listAllOutgoingReferences(reg_t object) const;
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
/* HunkTable */
struct HunkTable : public SegmentObjTable<Hunk> {
HunkTable() : SegmentObjTable<Hunk>(SEG_TYPE_HUNK) {}
virtual ~HunkTable() {
for (uint i = 0; i < _table.size(); i++) {
if (isValidEntry(i))
freeEntryContents(i);
}
}
void freeEntryContents(int idx) {
free(at(idx).mem);
at(idx).mem = 0;
}
virtual void freeEntry(int idx) {
SegmentObjTable<Hunk>::freeEntry(idx);
freeEntryContents(idx);
}
virtual void freeAtAddress(SegManager *segMan, reg_t sub_addr) {
freeEntry(sub_addr.getOffset());
}
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
// Free-style memory
struct DynMem : public SegmentObj {
int _size;
Common::String _description;
byte *_buf;
public:
DynMem() : SegmentObj(SEG_TYPE_DYNMEM), _size(0), _buf(0) {}
~DynMem() {
free(_buf);
_buf = NULL;
}
virtual bool isValidOffset(uint16 offset) const {
return offset < _size;
}
virtual SegmentRef dereference(reg_t pointer);
virtual reg_t findCanonicAddress(SegManager *segMan, reg_t addr) const {
return make_reg(addr.getSegment(), 0);
}
virtual Common::Array<reg_t> listAllDeallocatable(SegmentId segId) const {
const reg_t r = make_reg(segId, 0);
return Common::Array<reg_t>(&r, 1);
}
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
#ifdef ENABLE_SCI32
template<typename T>
class SciArray {
public:
SciArray() : _type(-1), _data(NULL), _size(0), _actualSize(0) { }
SciArray(const SciArray<T> &array) {
_type = array._type;
_size = array._size;
_actualSize = array._actualSize;
_data = new T[_actualSize];
assert(_data);
memcpy(_data, array._data, _size * sizeof(T));
}
SciArray<T>& operator=(const SciArray<T> &array) {
if (this == &array)
return *this;
delete[] _data;
_type = array._type;
_size = array._size;
_actualSize = array._actualSize;
_data = new T[_actualSize];
assert(_data);
memcpy(_data, array._data, _size * sizeof(T));
return *this;
}
virtual ~SciArray() {
destroy();
}
virtual void destroy() {
delete[] _data;
_data = NULL;
_type = -1;
_size = _actualSize = 0;
}
void setType(byte type) {
if (_type >= 0)
error("SciArray::setType(): Type already set");
_type = type;
}
void setSize(uint32 size) {
if (_type < 0)
error("SciArray::setSize(): No type set");
// Check if we don't have to do anything
if (_size == size)
return;
// Check if we don't have to expand the array
if (size <= _actualSize) {
_size = size;
return;
}
// So, we're going to have to create an array of some sort
T *newArray = new T[size];
memset(newArray, 0, size * sizeof(T));
// Check if we never created an array before
if (!_data) {
_size = _actualSize = size;
_data = newArray;
return;
}
// Copy data from the old array to the new
memcpy(newArray, _data, _size * sizeof(T));
// Now set the new array to the old and set the sizes
delete[] _data;
_data = newArray;
_size = _actualSize = size;
}
T getValue(uint16 index) const {
if (index >= _size)
error("SciArray::getValue(): %d is out of bounds (%d)", index, _size);
return _data[index];
}
void setValue(uint16 index, T value) {
if (index >= _size)
error("SciArray::setValue(): %d is out of bounds (%d)", index, _size);
_data[index] = value;
}
byte getType() const { return _type; }
uint32 getSize() const { return _size; }
T *getRawData() { return _data; }
const T *getRawData() const { return _data; }
protected:
int8 _type;
T *_data;
uint32 _size; // _size holds the number of entries that the scripts have requested
uint32 _actualSize; // _actualSize is the actual numbers of entries allocated
};
class SciString : public SciArray<char> {
public:
SciString() : SciArray<char>() { setType(3); }
// We overload destroy to ensure the string type is 3 after destroying
void destroy() { SciArray<char>::destroy(); _type = 3; }
Common::String toString() const;
void fromString(const Common::String &string);
};
struct ArrayTable : public SegmentObjTable<SciArray<reg_t> > {
ArrayTable() : SegmentObjTable<SciArray<reg_t> >(SEG_TYPE_ARRAY) {}
virtual void freeAtAddress(SegManager *segMan, reg_t sub_addr);
virtual Common::Array<reg_t> listAllOutgoingReferences(reg_t object) const;
void saveLoadWithSerializer(Common::Serializer &ser);
SegmentRef dereference(reg_t pointer);
};
struct StringTable : public SegmentObjTable<SciString> {
StringTable() : SegmentObjTable<SciString>(SEG_TYPE_STRING) {}
virtual void freeAtAddress(SegManager *segMan, reg_t sub_addr) {
at(sub_addr.getOffset()).destroy();
freeEntry(sub_addr.getOffset());
}
void saveLoadWithSerializer(Common::Serializer &ser);
SegmentRef dereference(reg_t pointer);
};
#endif
} // End of namespace Sci
#endif // SCI_ENGINE_SEGMENT_H
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