/* 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_SEGMAN_H #define SCI_ENGINE_SEGMAN_H #include "common/scummsys.h" #include "common/serializer.h" #include "sci/engine/vm.h" #include "sci/engine/segment.h" namespace Sci { #define GET_SEGMENT(mgr, index, rtype) (((mgr).getSegmentType(index) == (rtype))? (mgr)._heap[index] : NULL) /** * Parameters for getScriptSegment(). */ enum ScriptLoadType { SCRIPT_GET_DONT_LOAD = 0, /**< Fail if not loaded */ SCRIPT_GET_LOAD = 1, /**< Load, if neccessary */ SCRIPT_GET_LOCK = 3 /**< Load, if neccessary, and lock */ }; class SegManager : public Common::Serializable { friend class Console; public: /** * Initialize the segment manager. */ SegManager(ResourceManager *resMan); /** * Deallocate all memory associated with the segment manager. */ ~SegManager(); virtual void saveLoadWithSerializer(Common::Serializer &ser); // 1. Scripts /** * Allocate a script into the segment manager. * @param script_nr The number of the script to load * @param seg_id The segment ID of the newly allocated segment, * on success * @return 0 on failure, 1 on success */ Script *allocateScript(int script_nr, SegmentId *seg_id); // The script must then be initialised; see section (1b.), below. /** * Forcefully deallocate a previously allocated script. * @param script_nr number of the script to deallocate */ void deallocateScript(int script_nr); /** * Validate whether the specified public function is exported by * the script in the specified segment. * @param pubfunct Index of the function to validate * @param seg Segment ID of the script the check is to * be performed for * @return NULL if the public function is invalid, its * offset into the script's segment otherwise */ uint16 validateExportFunc(int pubfunct, SegmentId seg); /** * Determines the segment occupied by a certain script, if any. * @param script_nr Number of the script to look up * @return The script's segment ID, or 0 on failure */ SegmentId getScriptSegment(int script_nr) const; /** * Determines the segment occupied by a certain script. Optionally * load it, or load & lock it. * @param[in] script_nr Number of the script to look up * @param[in] load flag determining whether to load/lock the script * @return The script's segment ID, or 0 on failure */ SegmentId getScriptSegment(int script_nr, ScriptLoadType load); reg_t lookupScriptExport(int script_nr, int export_index) { SegmentId seg = getScriptSegment(script_nr, SCRIPT_GET_DONT_LOAD); return make_reg(seg, validateExportFunc(export_index, seg)); } // TODO: document this reg_t getClassAddress(int classnr, ScriptLoadType lock, reg_t caller); /** * Return a pointer to the specified script. * If the id is invalid, does not refer to a script or the script is * not loaded, this will invoke error(). * @param seg ID of the script segment to check for * @return A pointer to the Script object */ Script *getScript(SegmentId seg); /** * Return a pointer to the specified script. * If the id is invalid, does not refer to a script, or * the script is not loaded, this will return NULL * @param seg ID of the script segment to check for * @return A pointer to the Script object, or NULL */ Script *getScriptIfLoaded(SegmentId seg); // 1b. Script Initialisation // The set of functions below are intended // to be used during script instantiation, // i.e. loading and linking. /** * Initializes a script's local variable block * All variables are initialized to zero. * @param seg Segment containing the script to initialize * @param nr Number of local variables to allocate */ void scriptInitialiseLocalsZero(SegmentId seg, int nr); /** * Initializes a script's local variable block according to a prototype * @param location Location to initialize from */ void scriptInitialiseLocals(reg_t location); /** * Tells the segment manager whether exports are wide (32-bit) or not. * @param flag true if exports are wide, false otherwise */ void setExportAreWide(bool flag); // 2. Clones /** * Allocate a fresh clone * @param addr The offset of the freshly allocated clone * @return Reference to the memory allocated for the clone */ Clone *allocateClone(reg_t *addr); /** * Reconstructs clones. Used when restoring saved games */ void reconstructClones(); // 3. Objects (static, from Scripts, and dynmic, from Clones) // 4. Stack /** * Allocates a data stack * @param size Number of stack entries to reserve * @param segid Segment ID of the stack * @return The physical stack */ DataStack *allocateStack(int size, SegmentId *segid); // 5. System Strings /** * Allocates a system string table * See also sys_string_acquire(); * @param[in] segid Segment ID of the stack * @returns The physical stack */ SystemStrings *allocateSysStrings(SegmentId *segid); // 5. System Strings /** * Allocates a string fragments segment * See also stringfrag.h * @return Segment ID to use for string fragments */ SegmentId allocateStringFrags(); // 6, 7. Lists and Nodes /** * Allocate a fresh list * @param[in] addr The offset of the freshly allocated list * @return Reference to the memory allocated for the list */ List *allocateList(reg_t *addr); /** * Allocate a fresh node * @param[in] addr The offset of the freshly allocated node * @return Reference to the memory allocated for the node */ Node *allocateNode(reg_t *addr); // 8. Hunk Memory /** * Allocate a fresh chunk of the hunk * @param[in] size Number of bytes to allocate for the hunk entry * @param[in] hunk_type A descriptive string for the hunk entry, for * debugging purposes * @param[out] addr The offset of the freshly allocated hunk entry * @return Reference to the memory allocated for the hunk * piece */ Hunk *allocateHunkEntry(const char *hunk_type, int size, reg_t *addr); /** * Deallocates a hunk entry * @param[in] addr Offset of the hunk entry to delete */ void freeHunkEntry(reg_t addr); // 9. Dynamic Memory /** * Allocate some dynamic memory * @param[in] size Number of bytes to allocate * @param[in] description A descriptive string for debugging purposes * @param[out] addr The offset of the freshly allocated X * @return Raw pointer into the allocated dynamic * memory */ byte *allocDynmem(int size, const char *description, reg_t *addr); /** * Deallocates a piece of dynamic memory * @param[in] addr Offset of the dynmem chunk to free */ int freeDynmem(reg_t addr); /** * Gets the description of a dynmem segment * @param[in] addr Segment to describe * @return Pointer to the descriptive string set in allocDynmem */ const char *getDescription(reg_t addr); // Generic Operations on Segments and Addresses /** * Dereferences a raw memory pointer * @param[in] reg The reference to dereference * @return The data block referenced */ SegmentRef dereference(reg_t pointer); /** * Dereferences a heap pointer pointing to raw memory. * @param pointer The pointer to dereference * @parm entries The number of values expected (for checkingO * @return A physical reference to the address pointed to, or NULL on error or * if not enough entries were available. */ byte *derefBulkPtr(reg_t pointer, int entries); /** * Dereferences a heap pointer pointing to a (list of) register(s). * Ensures alignedness of data. * @param pointer The pointer to dereference * @parm entries The number of values expected (for checking) * @return A physical reference to the address pointed to, or NULL on error or * if not enough entries were available. */ reg_t *derefRegPtr(reg_t pointer, int entries); /** * Dereferences a heap pointer pointing to raw memory. * @param pointer The pointer to dereference * @parm entries The number of values expected (for checking) * @return A physical reference to the address pointed to, or NULL on error or * if not enough entries were available. */ char *derefString(reg_t pointer, int entries = 0); /** * Finds a unique segment by type * @param type The type of the segment to find * @return The segment number, or -1 if the segment wasn't found */ SegmentId findSegmentByType(int type); // TODO: document this SegmentObj *getSegmentObj(SegmentId seg); // TODO: document this SegmentType getSegmentType(SegmentId seg); /** * Retrieves an object from the specified location * @param[in] offset Location (segment, offset) of the object * @return The object in question, or NULL if there is none */ Object *getObject(reg_t pos); /** * Checks whether a heap address contains an object * @parm obj The address to check * @return True if it is an object, false otherwise */ bool isObject(reg_t obj) { return getObject(obj) != NULL; } // TODO: document this bool isHeapObject(reg_t pos); /** * Determines the name of an object * @param[in] pos Location (segment, offset) of the object * @return A name for that object, or a string describing an error * that occured while looking it up. The string is stored * in a static buffer and need not be freed (neither may * it be modified). */ const char *getObjectName(reg_t pos); void scriptRelocateExportsSci11(SegmentId seg); void scriptInitialiseObjectsSci11(SegmentId seg); public: // TODO: make private Common::Array _heap; Common::Array _classtable; /**< Table of all classes */ private: /** Map script ids to segment ids. */ Common::HashMap _scriptSegMap; ResourceManager *_resMan; bool _exportsAreWide; SegmentId Clones_seg_id; ///< ID of the (a) clones segment SegmentId Lists_seg_id; ///< ID of the (a) list segment SegmentId Nodes_seg_id; ///< ID of the (a) node segment SegmentId Hunks_seg_id; ///< ID of the (a) hunk segment private: SegmentObj *allocSegment(SegmentObj *mem, SegmentId *segid); LocalVariables *allocLocalsSegment(Script *scr, int count); int deallocate(SegmentId seg, bool recursive); int createClassTable(); Hunk *alloc_Hunk(reg_t *); SegmentId findFreeSegment() const; Object *scriptObjInit0(reg_t obj_pos); Object *scriptObjInit11(reg_t obj_pos); /** * Check segment validity * @param[in] seg The segment to validate * @return false if 'seg' is an invalid segment, true if * 'seg' is a valid segment */ bool check(SegmentId seg); }; } // End of namespace Sci #endif // SCI_ENGINE_SEGMAN