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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.
*
* $URL$
* $Id$
*
*/
#ifndef SCI_ENGINE_MEMOBJ_H
#define SCI_ENGINE_MEMOBJ_H
#include "common/serializer.h"
#include "sci/engine/vm.h"
#include "sci/engine/vm_types.h" // for reg_t
//#include "common/util.h"
namespace Sci {
enum MemObjectType {
MEM_OBJ_INVALID = 0,
MEM_OBJ_SCRIPT = 1,
MEM_OBJ_CLONES = 2,
MEM_OBJ_LOCALS = 3,
MEM_OBJ_STACK = 4,
MEM_OBJ_SYS_STRINGS = 5,
MEM_OBJ_LISTS = 6,
MEM_OBJ_NODES = 7,
MEM_OBJ_HUNK = 8,
MEM_OBJ_DYNMEM = 9,
MEM_OBJ_STRING_FRAG = 10,
MEM_OBJ_MAX // For sanity checking
};
struct MemObject : public Common::Serializable {
MemObjectType _type;
int _segmgrId; /**< Internal value used by the seg_manager's hash map */
typedef void (*NoteCallback)(void *param, reg_t addr); // FIXME: Bad choice of name
public:
static MemObject *createMemObject(MemObjectType type);
public:
virtual ~MemObject() {}
inline MemObjectType getType() const { return _type; }
inline int getSegMgrId() const { return _segmgrId; }
/**
* 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
* @param size if not NULL, set to the theoretical maximum size of the referenced data block
* @return the data block referenced
*/
virtual byte *dereference(reg_t pointer, int *size);
/**
* Finds the canonic address associated with sub_reg.
*
* 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 *segmgr, reg_t sub_addr) { return sub_addr; }
/**
* Deallocates all memory associated with the specified address.
* @param sub_addr address (within the given segment) to deallocate
*/
virtual void freeAtAddress(SegManager *segmgr, reg_t sub_addr) {}
/**
* Iterates over and reports all addresses within the current segment.
* @param note Invoked for each address on which free_at_address() makes sense
* @param param parameter passed to 'note'
*/
virtual void listAllDeallocatable(SegmentId segId, void *param, NoteCallback note) {}
/**
* Iterates over all references reachable from the specified object.
* @param object object (within the current segment) to analyse
* @param param parameter passed to 'note'
* @param note Invoked for each outgoing reference within the object
* Note: This function may also choose to report numbers (segment 0) as adresses
*/
virtual void listAllOutgoingReferences(EngineState *s, reg_t object, void *param, NoteCallback note) {}
};
// TODO: Implement the following class
struct StringFrag : public MemObject {
virtual bool isValidOffset(uint16 offset) const { return false; }
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
struct IntMapper;
enum {
SYS_STRINGS_MAX = 4,
SYS_STRING_SAVEDIR = 0,
SYS_STRING_PARSER_BASE = 1,
MAX_PARSER_BASE = 64
};
struct SystemString {
char *name;
int max_size;
reg_t *value;
};
struct SystemStrings : public MemObject {
SystemString strings[SYS_STRINGS_MAX];
public:
SystemStrings() {
memset(strings, 0, sizeof(strings));
}
~SystemStrings() {
for (int i = 0; i < SYS_STRINGS_MAX; i++) {
SystemString *str = &strings[i];
if (str->name) {
free(str->name);
str->name = NULL;
free(str->value);
str->value = NULL;
str->max_size = 0;
}
}
}
virtual bool isValidOffset(uint16 offset) const;
virtual byte *dereference(reg_t pointer, int *size);
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
/** This struct is used to buffer the list of send calls in send_selector() */
struct CallsStruct {
reg_t addr_func;
reg_t varp_objp;
union {
reg_t func;
ObjVarRef var;
} address;
StackPtr argp;
int argc;
Selector selector;
StackPtr sp; /**< Stack pointer */
int type; /**< Same as ExecStack.type */
};
struct LocalVariables : public MemObject {
int script_id; /**< Script ID this local variable block belongs to */
Common::Array<reg_t> _locals;
public:
LocalVariables() {
script_id = 0;
}
virtual bool isValidOffset(uint16 offset) const;
virtual byte *dereference(reg_t pointer, int *size);
virtual reg_t findCanonicAddress(SegManager *segmgr, reg_t sub_addr);
virtual void listAllOutgoingReferences(EngineState *s, reg_t object, void *param, NoteCallback note);
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
/** Clone has been marked as 'freed' */
#define OBJECT_FLAG_FREED (0x1 << 0)
struct Object {
int flags;
reg_t pos; /**< Object offset within its script; for clones, this is their base */
int variable_names_nr; /**< Number of variable names, may be less than variables_nr */
int methods_nr;
byte *base; /**< Points to a buffer all relative references (code, strings) point to */
byte *base_obj; /**< base + object offset within base */
uint16 *base_method; /**< Pointer to the method selector area for this object */
uint16 *base_vars; /**< Pointer to the varselector area for this object */
Common::Array<reg_t> _variables;
};
struct CodeBlock {
reg_t pos;
int size;
};
#define VM_OBJECT_GET_VARSELECTOR(obj, i) \
(s->_version < SCI_VERSION_1_1 ? \
READ_LE_UINT16(obj->base_obj + obj->_variables.size() * 2 + i*2) : \
*(obj->base_vars + i))
#define VM_OBJECT_READ_PROPERTY(obj, i) (obj->_variables[i])
#define VM_OBJECT_GET_FUNCSELECTOR(obj, i) \
(s->_version < SCI_VERSION_1_1 ? \
READ_LE_UINT16((byte *) (obj->base_method + i)) : \
READ_LE_UINT16((byte *) (obj->base_method + i*2 + 1)))
#define VM_OBJECT_READ_FUNCTION(obj, i) \
(s->_version < SCI_VERSION_1_1 ? \
make_reg(obj->pos.segment, \
READ_LE_UINT16((byte *) (obj->base_method \
+ obj->methods_nr + 1 \
+ i))) : \
make_reg(obj->pos.segment, \
READ_LE_UINT16((byte *) (obj->base_method \
+ i * 2 + 2))))
struct Script : public MemObject {
int nr; /**< Script number */
byte *buf; /**< Static data buffer, or NULL if not used */
size_t buf_size;
size_t script_size;
size_t heap_size;
byte *synonyms; /**< Synonyms block or 0 if not present*/
byte *heap_start; /**< Start of heap if SCI1.1, NULL otherwise */
uint16 *export_table; /**< Abs. offset of the export table or 0 if not present */
IntMapper *obj_indices;
int exports_nr; /**< Number of entries in the exports table */
int synonyms_nr; /**< Number of entries in the synonyms block */
int lockers; /**< Number of classes and objects that require this script */
/**
* Table for objects, contains property variables.
* Indexed by the value stored at SCRIPT_LOCALVARPTR_OFFSET,
* see VM_OBJECT_[GS]ET_INDEX()
*/
Common::Array<Object> _objects;
int locals_offset;
int locals_segment; /**< The local variable segment */
LocalVariables *locals_block;
Common::Array<CodeBlock> _codeBlocks;
int relocated;
bool _markedAsDeleted;
public:
Script() {
nr = 0;
buf = NULL;
buf_size = 0;
script_size = 0;
heap_size = 0;
synonyms = NULL;
heap_start = NULL;
export_table = NULL;
obj_indices = NULL;
locals_offset = 0;
locals_segment = 0;
locals_block = NULL;
relocated = 0;
_markedAsDeleted = 0;
}
~Script() {
freeScript();
}
void freeScript();
virtual bool isValidOffset(uint16 offset) const;
virtual byte *dereference(reg_t pointer, int *size);
virtual reg_t findCanonicAddress(SegManager *segmgr, reg_t sub_addr);
virtual void freeAtAddress(SegManager *segmgr, reg_t sub_addr);
virtual void listAllDeallocatable(SegmentId segId, void *param, NoteCallback note);
virtual void listAllOutgoingReferences(EngineState *s, reg_t object, void *param, NoteCallback note);
virtual void saveLoadWithSerializer(Common::Serializer &ser);
// script lock operations
/** Increments the number of lockers of this script by one. */
void incrementLockers();
/** Decrements the number of lockers of this script by one. */
void decrementLockers();
/**
* Retrieves the number of locks held on this script.
* @return the number of locks held on the previously identified script
*/
int getLockers() const;
/** Sets the number of locks held on this script. */
void setLockers(int lockers);
/**
* Retrieves a pointer to the synonyms associated with this script
* @return pointer to the synonyms, in non-parsed format.
*/
byte *getSynonyms() const;
/**
* Retrieves the number of synonyms associated with this script.
* @return the number of synonyms associated with this script
*/
int getSynonymsNr() const;
/**
* Sets the script-relative offset of the exports table.
* @param offset script-relative exports table offset
*/
void setExportTableOffset(int offset);
/**
* Sets the script-relative offset of the synonyms associated with this script.
* @param offset script-relative offset of the synonyms block
*/
void setSynonymsOffset(int offset);
/**
* Sets the number of synonyms associated with this script,
* @param nr number of synonyms, as to be stored within the script
*/
void setSynonymsNr(int nr);
/**
* Marks the script as deleted.
* This will not actually delete the script. If references remain present on the
* heap or the stack, the script will stay in memory in a quasi-deleted state until
* either unreachable (resulting in its eventual deletion) or reloaded (resulting
* in its data being updated).
*/
void markDeleted() {
_markedAsDeleted = true;
}
/**
* Marks the script as not deleted.
*/
void unmarkDeleted() {
_markedAsDeleted = false;
}
/**
* Determines whether the script is marked as being deleted.
*/
bool isMarkedAsDeleted() const {
return _markedAsDeleted;
}
/**
* Copies a byte string into a script's heap representation.
* @param dst script-relative offset of the destination area
* @param src pointer to the data source location
* @param n number of bytes to copy
*/
void mcpyInOut(int dst, const void *src, size_t n);
/**
* Retrieves a 16 bit value from within a script's heap representation.
* @param offset offset to read from
* @return the value read from the specified location
*/
int16 getHeap(uint16 offset) const;
};
/** Data stack */
struct DataStack : MemObject {
int nr; /**< Number of stack entries */
reg_t *entries;
public:
DataStack() {
nr = 0;
entries = NULL;
}
~DataStack() {
free(entries);
entries = NULL;
}
virtual bool isValidOffset(uint16 offset) const;
virtual byte *dereference(reg_t pointer, int *size);
virtual reg_t findCanonicAddress(SegManager *segmgr, reg_t sub_addr);
virtual void listAllOutgoingReferences(EngineState *s, reg_t object, void *param, NoteCallback note);
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
#define CLONE_USED -1
#define 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;
unsigned int size;
const char *type;
};
template<typename T>
struct Table : public MemObject {
typedef T value_type;
struct Entry : public T {
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 */
Common::Array<Entry> _table;
public:
Table() {
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 void listAllDeallocatable(SegmentId segId, void *param, NoteCallback note) {
for (uint i = 0; i < _table.size(); i++)
if (isValidEntry(i))
(*note)(param, make_reg(segId, i));
}
};
/* CloneTable */
struct CloneTable : public Table<Clone> {
virtual void freeAtAddress(SegManager *segmgr, reg_t sub_addr);
virtual void listAllOutgoingReferences(EngineState *s, reg_t object, void *param, NoteCallback note);
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
/* NodeTable */
struct NodeTable : public Table<Node> {
virtual void freeAtAddress(SegManager *segmgr, reg_t sub_addr);
virtual void listAllOutgoingReferences(EngineState *s, reg_t object, void *param, NoteCallback note);
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
/* ListTable */
struct ListTable : public Table<List> {
virtual void freeAtAddress(SegManager *segmgr, reg_t sub_addr);
virtual void listAllOutgoingReferences(EngineState *s, reg_t object, void *param, NoteCallback note);
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
/* HunkTable */
struct HunkTable : public Table<Hunk> {
virtual void freeEntry(int idx) {
Table<Hunk>::freeEntry(idx);
free(_table[idx].mem);
}
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
// Free-style memory
struct DynMem : public MemObject {
int _size;
char *_description;
byte *_buf;
public:
DynMem() : _size(0), _description(0), _buf(0) {}
~DynMem() {
free(_description);
_description = NULL;
free(_buf);
_buf = NULL;
}
virtual bool isValidOffset(uint16 offset) const;
virtual byte *dereference(reg_t pointer, int *size);
virtual reg_t findCanonicAddress(SegManager *segmgr, reg_t sub_addr);
virtual void listAllDeallocatable(SegmentId segId, void *param, NoteCallback note);
virtual void saveLoadWithSerializer(Common::Serializer &ser);
};
} // End of namespace Sci
#endif // SCI_ENGINE_VM_H
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