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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.
*
* $URL$
* $Id$
*
*/
#include "sci/sci.h"
#include "sci/engine/seg_manager.h"
#include "sci/engine/state.h"
#include "sci/engine/intmap.h"
namespace Sci {
/**
* Verify the the given condition is true, output the message if condition is false, and exit.
* @param cond condition to be verified
* @param msg the message to be printed if condition fails
*/
#define VERIFY( cond, msg ) if (!(cond)) {\
error("%s, line, %d, %s", __FILE__, __LINE__, msg); \
}
#define DEFAULT_SCRIPTS 32
#define DEFAULT_OBJECTS 8 // default # of objects per script
#define DEFAULT_OBJECTS_INCREMENT 4 // Number of additional objects to instantiate if we're running out of them
//#define GC_DEBUG // Debug garbage collection
//#define GC_DEBUG_VERBOSE // Debug garbage verbosely
#undef DEBUG_segmentManager // Define to turn on debugging
#define INVALID_SCRIPT_ID -1
SegManager::SegManager(ResourceManager *resourceManager) {
id_seg_map = new IntMapper();
reserved_id = INVALID_SCRIPT_ID;
id_seg_map->checkKey(reserved_id, true); // reserve entry 0 for INVALID_SCRIPT_ID
reserved_id--; // reserved_id runs in the reversed direction to make sure no one will use it.
_heap.push_back(0);
Clones_seg_id = 0;
Lists_seg_id = 0;
Nodes_seg_id = 0;
Hunks_seg_id = 0;
exports_wide = 0;
_resourceManager = resourceManager;
int result = 0;
result = createClassTable();
if (result)
error("SegManager: Failed to initialize class table");
}
// Destroy the object, free the memorys if allocated before
SegManager::~SegManager() {
// Free memory
for (uint i = 0; i < _heap.size(); i++) {
if (_heap[i])
deallocate(i, false);
}
delete id_seg_map;
}
int SegManager::findFreeId(int *id) {
bool was_added = false;
int retval = 0;
while (!was_added) {
retval = id_seg_map->checkKey(reserved_id, true, &was_added);
*id = reserved_id--;
if (reserved_id < -1000000)
reserved_id = -10;
// Make sure we don't underflow
}
return retval;
}
MemObject *SegManager::allocNonscriptSegment(MemObjectType type, SegmentId *segid) {
// Allocates a non-script segment
int id;
*segid = findFreeId(&id);
return memObjAllocate(*segid, id, type);
}
// allocate a memory for script from heap
// Parameters: (EngineState *) s: The state to operate on
// (int) script_nr: The script number to load
// Returns : 0 - allocation failure
// 1 - allocated successfully
// seg_id - allocated segment id
Script *SegManager::allocateScript(int script_nr, SegmentId *seg_id) {
bool was_added;
MemObject *mem;
*seg_id = id_seg_map->checkKey(script_nr, true, &was_added);
if (!was_added) {
return (Script *)_heap[*seg_id];
}
// allocate the MemObject
mem = memObjAllocate(*seg_id, script_nr, MEM_OBJ_SCRIPT);
if (!mem) {
error("allocateScript: Not enough memory");
return NULL;
}
return (Script *)mem;
}
void SegManager::setScriptSize(Script &scr, int script_nr) {
Resource *script = _resourceManager->findResource(ResourceId(kResourceTypeScript, script_nr), 0);
Resource *heap = _resourceManager->findResource(ResourceId(kResourceTypeHeap, script_nr), 0);
scr.script_size = script->size;
scr.heap_size = 0; // Set later
if (!script || (_resourceManager->sciVersion() >= SCI_VERSION_1_1 && !heap)) {
error("SegManager::setScriptSize: failed to load %s", !script ? "script" : "heap");
}
if (_resourceManager->sciVersion() == SCI_VERSION_0_EARLY) { // check if we got an old script header
scr.buf_size = script->size + READ_LE_UINT16(script->data) * 2;
//locals_size = READ_LE_UINT16(script->data) * 2;
} else if (_resourceManager->sciVersion() < SCI_VERSION_1_1) {
scr.buf_size = script->size;
} else {
scr.buf_size = script->size + heap->size;
scr.heap_size = heap->size;
// Ensure that the start of the heap resource can be word-aligned.
if (script->size & 2) {
scr.buf_size++;
scr.script_size++;
}
if (scr.buf_size > 65535) {
error("Script and heap sizes combined exceed 64K."
"This means a fundamental design bug was made in SCI\n"
"regarding SCI1.1 games.\nPlease report this so it can be"
"fixed in the next major version");
return;
}
}
}
int SegManager::initialiseScript(Script &scr, int script_nr) {
// allocate the script.buf
setScriptSize(scr, script_nr);
scr.buf = (byte *)malloc(scr.buf_size);
#ifdef DEBUG_segmentManager
printf("scr.buf = %p ", scr.buf);
#endif
if (!scr.buf) {
scr.freeScript();
warning("SegManager: Not enough memory space for script size");
scr.buf_size = 0;
return 0;
}
// Initialize objects
scr.locals_offset = 0;
scr.locals_block = NULL;
scr._codeBlocks.clear();
scr.nr = script_nr;
scr._markedAsDeleted = false;
scr.relocated = 0;
scr.obj_indices = new IntMapper();
if (_resourceManager->sciVersion() >= SCI_VERSION_1_1)
scr.heap_start = scr.buf + scr.script_size;
else
scr.heap_start = scr.buf;
return 1;
}
int SegManager::deallocate(SegmentId seg, bool recursive) {
MemObject *mobj;
VERIFY(check(seg), "invalid seg id");
mobj = _heap[seg];
id_seg_map->removeKey(mobj->getSegmentManagerId());
if (mobj->getType() == MEM_OBJ_SCRIPT) {
Script *scr = (Script *)mobj;
if (recursive && scr->locals_segment)
deallocate(scr->locals_segment, recursive);
}
delete mobj;
_heap[seg] = NULL;
return 1;
}
bool SegManager::scriptIsMarkedAsDeleted(SegmentId seg) {
Script *scr = getScriptIfLoaded(seg);
if (!scr)
return false;
return scr->_markedAsDeleted;
}
int SegManager::deallocateScript(int script_nr) {
SegmentId seg = segGet(script_nr);
deallocate(seg, true);
return 1;
}
MemObject *SegManager::memObjAllocate(SegmentId segid, int hash_id, MemObjectType type) {
MemObject *mem = MemObject::createMemObject(type);
if (!mem) {
warning("SegManager: invalid mobj");
return NULL;
}
if (segid >= (int)_heap.size()) {
assert(segid == (int)_heap.size());
_heap.push_back(0);
}
mem->_segManagerId = hash_id;
// hook it to the heap
_heap[segid] = mem;
return mem;
}
// return the seg if script_id is valid and in the map, else -1
SegmentId SegManager::segGet(int script_id) const {
return id_seg_map->lookupKey(script_id);
}
Script *SegManager::getScript(const SegmentId seg) {
// FIXME: We accept segment 0, but that is actually an invalid segment...
if (seg < 0 || (uint)seg >= _heap.size()) {
error("SegManager::getScript(): seg id %x out of bounds", seg);
}
if (!_heap[seg]) {
error("SegManager::getScript(): seg id %x is not in memory", seg);
}
if (_heap[seg]->getType() != MEM_OBJ_SCRIPT) {
error("SegManager::getScript(): seg id %x refers to type %d != MEM_OBJ_SCRIPT", seg, _heap[seg]->getType());
}
return (Script *)_heap[seg];
}
Script *SegManager::getScriptIfLoaded(const SegmentId seg) {
// FIXME: We accept segment 0, but that is actually an invalid segment...
if (seg < 0 || (uint)seg >= _heap.size() || !_heap[seg] || _heap[seg]->getType() != MEM_OBJ_SCRIPT)
return 0;
return (Script *)_heap[seg];
}
// validate the seg
// return:
// false - invalid seg
// true - valid seg
bool SegManager::check(SegmentId seg) {
// FIXME: We accept segment 0, but that is actually an invalid segment...
if (seg < 0 || (uint)seg >= _heap.size()) {
return false;
}
if (!_heap[seg]) {
warning("SegManager: seg %x is removed from memory, but not removed from hash_map", seg);
return false;
}
return true;
}
bool SegManager::scriptIsLoaded(SegmentId seg) {
return getScriptIfLoaded(seg) != 0;
}
void SegManager::setExportWidth(int flag) {
exports_wide = flag;
}
int SegManager::relocateBlock(Common::Array<reg_t> &block, int block_location, SegmentId segment, int location) {
int rel = location - block_location;
if (rel < 0)
return 0;
uint idx = rel >> 1;
if (idx >= block.size())
return 0;
if (rel & 1) {
warning("Attempt to relocate odd variable #%d.5e (relative to %04x)\n", idx, block_location);
return 0;
}
block[idx].segment = segment; // Perform relocation
if (_resourceManager->sciVersion() == SCI_VERSION_1_1)
block[idx].offset += getScript(segment)->script_size;
return 1;
}
int SegManager::relocateLocal(Script *scr, SegmentId segment, int location) {
if (scr->locals_block)
return relocateBlock(scr->locals_block->_locals, scr->locals_offset, segment, location);
else
return 0; // No hands, no cookies
}
int SegManager::relocateObject(Object *obj, SegmentId segment, int location) {
return relocateBlock(obj->_variables, obj->pos.offset, segment, location);
}
void SegManager::scriptAddCodeBlock(reg_t location) {
Script *scr = getScript(location.segment);
CodeBlock cb;
cb.pos = location;
cb.size = READ_LE_UINT16(scr->buf + location.offset - 2);
scr->_codeBlocks.push_back(cb);
}
void SegManager::scriptRelocate(reg_t block) {
Script *scr = getScript(block.segment);
VERIFY(block.offset < (uint16)scr->buf_size && READ_LE_UINT16(scr->buf + block.offset) * 2 + block.offset < (uint16)scr->buf_size,
"Relocation block outside of script\n");
int count = READ_LE_UINT16(scr->buf + block.offset);
for (int i = 0; i <= count; i++) {
int pos = READ_LE_UINT16(scr->buf + block.offset + 2 + (i * 2));
if (!pos)
continue; // FIXME: A hack pending investigation
if (!relocateLocal(scr, block.segment, pos)) {
bool done = false;
uint k;
for (k = 0; !done && k < scr->_objects.size(); k++) {
if (relocateObject(&scr->_objects[k], block.segment, pos))
done = true;
}
for (k = 0; !done && k < scr->_codeBlocks.size(); k++) {
if (pos >= scr->_codeBlocks[k].pos.offset &&
pos < scr->_codeBlocks[k].pos.offset + scr->_codeBlocks[k].size)
done = true;
}
if (!done) {
printf("While processing relocation block %04x:%04x:\n", PRINT_REG(block));
printf("Relocation failed for index %04x (%d/%d)\n", pos, i + 1, count);
if (scr->locals_block)
printf("- locals: %d at %04x\n", scr->locals_block->_locals.size(), scr->locals_offset);
else
printf("- No locals\n");
for (k = 0; k < scr->_objects.size(); k++)
printf("- obj#%d at %04x w/ %d vars\n", k, scr->_objects[k].pos.offset, scr->_objects[k]._variables.size());
// SQ3 script 71 has broken relocation entries.
// Since this is mainstream, we can't break out as we used to do.
printf("Trying to continue anyway...\n");
}
}
}
}
void SegManager::heapRelocate(reg_t block) {
Script *scr = getScript(block.segment);
VERIFY(block.offset < (uint16)scr->heap_size && READ_LE_UINT16(scr->heap_start + block.offset) * 2 + block.offset < (uint16)scr->buf_size,
"Relocation block outside of script\n");
if (scr->relocated)
return;
scr->relocated = 1;
int count = READ_LE_UINT16(scr->heap_start + block.offset);
for (int i = 0; i < count; i++) {
int pos = READ_LE_UINT16(scr->heap_start + block.offset + 2 + (i * 2)) + scr->script_size;
if (!relocateLocal(scr, block.segment, pos)) {
bool done = false;
uint k;
for (k = 0; !done && k < scr->_objects.size(); k++) {
if (relocateObject(&scr->_objects[k], block.segment, pos))
done = true;
}
if (!done) {
printf("While processing relocation block %04x:%04x:\n", PRINT_REG(block));
printf("Relocation failed for index %04x (%d/%d)\n", pos, i + 1, count);
if (scr->locals_block)
printf("- locals: %d at %04x\n", scr->locals_block->_locals.size(), scr->locals_offset);
else
printf("- No locals\n");
for (k = 0; k < scr->_objects.size(); k++)
printf("- obj#%d at %04x w/ %d vars\n", k, scr->_objects[k].pos.offset, scr->_objects[k]._variables.size());
printf("Triggering breakpoint...\n");
error("Breakpoint in %s, line %d", __FILE__, __LINE__);
}
}
}
}
SegmentId SegManager::getSegment(int script_nr, SCRIPT_GET load) {
SegmentId segment;
if ((load & SCRIPT_GET_LOAD) == SCRIPT_GET_LOAD)
script_instantiate(_resourceManager, this, script_nr);
segment = segGet(script_nr);
if (segment > 0) {
if ((load & SCRIPT_GET_LOCK) == SCRIPT_GET_LOCK)
getScript(segment)->incrementLockers();
return segment;
} else
return 0;
}
#define INST_LOOKUP_CLASS(id) ((id == 0xffff) ? NULL_REG : get_class_address(id, SCRIPT_GET_LOCK, NULL_REG))
reg_t SegManager::get_class_address(int classnr, SCRIPT_GET lock, reg_t caller) {
if (classnr < 0 || (int)_classtable.size() <= classnr || _classtable[classnr].script < 0) {
error("[VM] Attempt to dereference class %x, which doesn't exist (max %x)", classnr, _classtable.size());
return NULL_REG;
} else {
Class *the_class = &_classtable[classnr];
if (!the_class->reg.segment) {
getSegment(the_class->script, lock);
if (!the_class->reg.segment) {
error("[VM] Trying to instantiate class %x by instantiating script 0x%x (%03d) failed;"
" Entering debugger.", classnr, the_class->script, the_class->script);
return NULL_REG;
}
} else
if (caller.segment != the_class->reg.segment)
getScript(the_class->reg.segment)->incrementLockers();
return the_class->reg;
}
}
Object *SegManager::scriptObjInit0(reg_t obj_pos) {
Object *obj;
int id;
SciVersion version = _resourceManager->sciVersion(); // for the offset defines
unsigned int base = obj_pos.offset - SCRIPT_OBJECT_MAGIC_OFFSET;
reg_t temp;
Script *scr = getScript(obj_pos.segment);
VERIFY(base < scr->buf_size, "Attempt to initialize object beyond end of script\n");
temp = make_reg(obj_pos.segment, base);
id = scr->obj_indices->checkKey(base, true);
if ((uint)id == scr->_objects.size())
scr->_objects.push_back(Object());
obj = &scr->_objects[id];
VERIFY(base + SCRIPT_FUNCTAREAPTR_OFFSET < scr->buf_size, "Function area pointer stored beyond end of script\n");
{
byte *data = (byte *)(scr->buf + base);
int funct_area = READ_LE_UINT16(data + SCRIPT_FUNCTAREAPTR_OFFSET);
int variables_nr;
int functions_nr;
int is_class;
int i;
obj->flags = 0;
obj->pos = temp;
VERIFY(base + funct_area < scr->buf_size, "Function area pointer references beyond end of script");
variables_nr = READ_LE_UINT16(data + SCRIPT_SELECTORCTR_OFFSET);
functions_nr = READ_LE_UINT16(data + funct_area - 2);
is_class = READ_LE_UINT16(data + SCRIPT_INFO_OFFSET) & SCRIPT_INFO_CLASS;
VERIFY(base + funct_area + functions_nr * 2
// add again for classes, since those also store selectors
+ (is_class ? functions_nr * 2 : 0) < scr->buf_size, "Function area extends beyond end of script");
obj->_variables.resize(variables_nr);
obj->methods_nr = functions_nr;
obj->base = scr->buf;
obj->base_obj = data;
obj->base_method = (uint16 *)(data + funct_area);
obj->base_vars = NULL;
for (i = 0; i < variables_nr; i++)
obj->_variables[i] = make_reg(0, READ_LE_UINT16(data + (i * 2)));
}
return obj;
}
Object *SegManager::scriptObjInit11(reg_t obj_pos) {
Object *obj;
int id;
int base = obj_pos.offset;
Script *scr = getScript(obj_pos.segment);
VERIFY(base < (uint16)scr->buf_size, "Attempt to initialize object beyond end of script\n");
id = scr->obj_indices->checkKey(obj_pos.offset, true);
if ((uint)id == scr->_objects.size())
scr->_objects.push_back(Object());
obj = &scr->_objects[id];
VERIFY(base + SCRIPT_FUNCTAREAPTR_OFFSET < (uint16)scr->buf_size, "Function area pointer stored beyond end of script\n");
{
byte *data = (byte *)(scr->buf + base);
uint16 *funct_area = (uint16 *)(scr->buf + READ_LE_UINT16(data + 6));
uint16 *prop_area = (uint16 *)(scr->buf + READ_LE_UINT16(data + 4));
int variables_nr;
int functions_nr;
int is_class;
int i;
obj->flags = 0;
obj->pos = obj_pos;
VERIFY((byte *) funct_area < scr->buf + scr->buf_size, "Function area pointer references beyond end of script");
variables_nr = READ_LE_UINT16(data + 2);
functions_nr = READ_LE_UINT16(funct_area);
is_class = READ_LE_UINT16(data + 14) & SCRIPT_INFO_CLASS;
obj->base_method = funct_area;
obj->base_vars = prop_area;
VERIFY(((byte *) funct_area + functions_nr) < scr->buf + scr->buf_size, "Function area extends beyond end of script");
obj->variable_names_nr = variables_nr;
obj->_variables.resize(variables_nr);
obj->methods_nr = functions_nr;
obj->base = scr->buf;
obj->base_obj = data;
for (i = 0; i < variables_nr; i++)
obj->_variables[i] = make_reg(0, READ_LE_UINT16(data + (i * 2)));
}
return obj;
}
Object *SegManager::scriptObjInit(reg_t obj_pos) {
if (_resourceManager->sciVersion() != SCI_VERSION_1_1)
return scriptObjInit0(obj_pos);
else
return scriptObjInit11(obj_pos);
}
LocalVariables *SegManager::allocLocalsSegment(Script *scr, int count) {
if (!count) { // No locals
scr->locals_segment = 0;
scr->locals_block = NULL;
return NULL;
} else {
LocalVariables *locals;
if (scr->locals_segment) {
locals = (LocalVariables *)_heap[scr->locals_segment];
VERIFY(locals != NULL, "Re-used locals segment was NULL'd out");
VERIFY(locals->getType() == MEM_OBJ_LOCALS, "Re-used locals segment did not consist of local variables");
VERIFY(locals->script_id == scr->nr, "Re-used locals segment belonged to other script");
} else
locals = (LocalVariables *)allocNonscriptSegment(MEM_OBJ_LOCALS, &scr->locals_segment);
scr->locals_block = locals;
locals->script_id = scr->nr;
locals->_locals.resize(count);
return locals;
}
}
void SegManager::scriptInitialiseLocalsZero(SegmentId seg, int count) {
Script *scr = getScript(seg);
scr->locals_offset = -count * 2; // Make sure it's invalid
allocLocalsSegment(scr, count);
}
void SegManager::scriptInitialiseLocals(reg_t location) {
Script *scr = getScript(location.segment);
unsigned int count;
VERIFY(location.offset + 1 < (uint16)scr->buf_size, "Locals beyond end of script\n");
if (_resourceManager->sciVersion() == SCI_VERSION_1_1)
count = READ_LE_UINT16(scr->buf + location.offset - 2);
else
count = (READ_LE_UINT16(scr->buf + location.offset - 2) - 4) >> 1;
// half block size
scr->locals_offset = location.offset;
if (!(location.offset + count * 2 + 1 < scr->buf_size)) {
warning("Locals extend beyond end of script: offset %04x, count %x vs size %x", location.offset, count, (uint)scr->buf_size);
count = (scr->buf_size - location.offset) >> 1;
}
LocalVariables *locals = allocLocalsSegment(scr, count);
if (locals) {
uint i;
byte *base = (byte *)(scr->buf + location.offset);
for (i = 0; i < count; i++)
locals->_locals[i].offset = READ_LE_UINT16(base + i * 2);
}
}
void SegManager::scriptRelocateExportsSci11(SegmentId seg) {
Script *scr = getScript(seg);
for (int i = 0; i < scr->exports_nr; i++) {
/* We are forced to use an ugly heuristic here to distinguish function
exports from object/class exports. The former kind points into the
script resource, the latter into the heap resource. */
uint16 location = READ_LE_UINT16((byte *)(scr->export_table + i));
if ((location < scr->heap_size - 1) && (READ_LE_UINT16(scr->heap_start + location) == SCRIPT_OBJECT_MAGIC_NUMBER)) {
WRITE_LE_UINT16((byte *)(scr->export_table + i), location + scr->heap_start - scr->buf);
} else {
// Otherwise it's probably a function export,
// and we don't need to do anything.
}
}
}
void SegManager::scriptInitialiseObjectsSci11(SegmentId seg) {
Script *scr = getScript(seg);
byte *seeker = scr->heap_start + 4 + READ_LE_UINT16(scr->heap_start + 2) * 2;
SciVersion version = _resourceManager->sciVersion(); // for the selector defines
while (READ_LE_UINT16(seeker) == SCRIPT_OBJECT_MAGIC_NUMBER) {
if (READ_LE_UINT16(seeker + 14) & SCRIPT_INFO_CLASS) {
int classpos = seeker - scr->buf;
int species = READ_LE_UINT16(seeker + 10);
if (species < 0 || species >= (int)_classtable.size()) {
error("Invalid species %d(0x%x) not in interval [0,%d) while instantiating script %d",
species, species, _classtable.size(), scr->nr);
return;
}
_classtable[species].reg.segment = seg;
_classtable[species].reg.offset = classpos;
}
seeker += READ_LE_UINT16(seeker + 2) * 2;
}
seeker = scr->heap_start + 4 + READ_LE_UINT16(scr->heap_start + 2) * 2;
while (READ_LE_UINT16(seeker) == SCRIPT_OBJECT_MAGIC_NUMBER) {
reg_t reg;
Object *obj;
reg.segment = seg;
reg.offset = seeker - scr->buf;
obj = scriptObjInit(reg);
#if 0
if (obj->_variables[5].offset != 0xffff) {
obj->_variables[5] = INST_LOOKUP_CLASS(obj->_variables[5].offset);
base_obj = obj_get(s->segmentManager, obj->_variables[5]);
obj->variable_names_nr = base_obj->variables_nr;
obj->base_obj = base_obj->base_obj;
}
#endif
// Copy base from species class, as we need its selector IDs
obj->_variables[SCRIPT_SUPERCLASS_SELECTOR] = INST_LOOKUP_CLASS(obj->_variables[SCRIPT_SUPERCLASS_SELECTOR].offset);
// Set the -classScript- selector to the script number.
// FIXME: As this selector is filled in at run-time, it is likely
// that it is supposed to hold a pointer. The Obj::isKindOf method
// uses this selector together with -propDict- to compare classes.
// For the purpose of Obj::isKindOf, using the script number appears
// to be sufficient.
obj->_variables[SCRIPT_CLASSSCRIPT_SELECTOR] = make_reg(0, scr->nr);
seeker += READ_LE_UINT16(seeker + 2) * 2;
}
}
/*
static char *SegManager::dynprintf(char *msg, ...) {
va_list argp;
char *buf = (char *)malloc(strlen(msg) + 100);
va_start(argp, msg);
vsprintf(buf, msg, argp);
va_end(argp);
return buf;
}
*/
DataStack *SegManager::allocateStack(int size, SegmentId *segid) {
MemObject *mobj = allocNonscriptSegment(MEM_OBJ_STACK, segid);
DataStack *retval = (DataStack *)mobj;
retval->entries = (reg_t *)calloc(size, sizeof(reg_t));
retval->nr = size;
return retval;
}
SystemStrings *SegManager::allocateSysStrings(SegmentId *segid) {
return (SystemStrings *)allocNonscriptSegment(MEM_OBJ_SYS_STRINGS, segid);
}
SegmentId SegManager::allocateStringFrags() {
SegmentId segid;
allocNonscriptSegment(MEM_OBJ_STRING_FRAG, &segid);
return segid;
}
uint16 SegManager::validateExportFunc(int pubfunct, SegmentId seg) {
Script *scr = getScript(seg);
if (scr->exports_nr <= pubfunct) {
warning("validateExportFunc(): pubfunct is invalid");
return 0;
}
if (exports_wide)
pubfunct *= 2;
uint16 offset = READ_LE_UINT16((byte *)(scr->export_table + pubfunct));
VERIFY(offset < scr->buf_size, "invalid export function pointer");
return offset;
}
void SegManager::free_hunk_entry(reg_t addr) {
HunkTable *ht = (HunkTable *)GET_SEGMENT(*this, addr.segment, MEM_OBJ_HUNK);
if (!ht) {
warning("Attempt to free Hunk from address %04x:%04x: Invalid segment type", PRINT_REG(addr));
return;
}
ht->freeEntry(addr.offset);
}
Hunk *SegManager::alloc_hunk_entry(const char *hunk_type, int size, reg_t *reg) {
Hunk *h = alloc_Hunk(reg);
if (!h)
return NULL;
h->mem = malloc(size);
h->size = size;
h->type = hunk_type;
return h;
}
Clone *SegManager::alloc_Clone(reg_t *addr) {
CloneTable *table;
int offset;
if (!Clones_seg_id) {
table = (CloneTable *)allocNonscriptSegment(MEM_OBJ_CLONES, &(Clones_seg_id));
} else
table = (CloneTable *)_heap[Clones_seg_id];
offset = table->allocEntry();
*addr = make_reg(Clones_seg_id, offset);
return &(table->_table[offset]);
}
List *SegManager::alloc_List(reg_t *addr) {
ListTable *table;
int offset;
if (!Lists_seg_id)
allocNonscriptSegment(MEM_OBJ_LISTS, &(Lists_seg_id));
table = (ListTable *)_heap[Lists_seg_id];
offset = table->allocEntry();
*addr = make_reg(Lists_seg_id, offset);
return &(table->_table[offset]);
}
Node *SegManager::alloc_Node(reg_t *addr) {
NodeTable *table;
int offset;
if (!Nodes_seg_id)
allocNonscriptSegment(MEM_OBJ_NODES, &(Nodes_seg_id));
table = (NodeTable *)_heap[Nodes_seg_id];
offset = table->allocEntry();
*addr = make_reg(Nodes_seg_id, offset);
return &(table->_table[offset]);
}
Hunk *SegManager::alloc_Hunk(reg_t *addr) {
HunkTable *table;
int offset;
if (!Hunks_seg_id)
allocNonscriptSegment(MEM_OBJ_HUNK, &(Hunks_seg_id));
table = (HunkTable *)_heap[Hunks_seg_id];
offset = table->allocEntry();
*addr = make_reg(Hunks_seg_id, offset);
return &(table->_table[offset]);
}
byte *SegManager::dereference(reg_t pointer, int *size) {
if (!pointer.segment || (pointer.segment >= _heap.size()) || !_heap[pointer.segment]) {
// This occurs in KQ5CD when interacting with certain objects
warning("Attempt to dereference invalid pointer %04x:%04x", PRINT_REG(pointer));
return NULL; /* Invalid */
}
MemObject *mobj = _heap[pointer.segment];
return mobj->dereference(pointer, size);
}
unsigned char *SegManager::allocDynmem(int size, const char *descr, reg_t *addr) {
SegmentId seg;
MemObject *mobj = allocNonscriptSegment(MEM_OBJ_DYNMEM, &seg);
*addr = make_reg(seg, 0);
DynMem &d = *(DynMem *)mobj;
d._size = size;
if (size == 0)
d._buf = NULL;
else
d._buf = (byte *)malloc(size);
d._description = strdup(descr);
return (unsigned char *)(d._buf);
}
const char *SegManager::getDescription(reg_t addr) {
if (addr.segment >= _heap.size())
return "";
MemObject *mobj = _heap[addr.segment];
switch (mobj->getType()) {
case MEM_OBJ_DYNMEM:
return (*(DynMem *)mobj)._description;
default:
return "";
}
}
int SegManager::freeDynmem(reg_t addr) {
if (addr.segment <= 0 || addr.segment >= _heap.size() || !_heap[addr.segment] || _heap[addr.segment]->getType() != MEM_OBJ_DYNMEM)
return 1; // error
deallocate(addr.segment, true);
return 0; // OK
}
int SegManager::createClassTable() {
Resource *vocab996 = _resourceManager->findResource(ResourceId(kResourceTypeVocab, 996), 1);
if (!vocab996)
error("SegManager: failed to open vocab 996");
int totalClasses = vocab996->size >> 2;
_classtable.resize(totalClasses);
for (uint16 classNr = 0; classNr < totalClasses; classNr++) {
uint16 scriptNr = READ_LE_UINT16(vocab996->data + classNr * 4 + 2);
_classtable[classNr].reg = NULL_REG;
_classtable[classNr].script = scriptNr;
}
_resourceManager->unlockResource(vocab996);
return 0;
}
} // End of namespace Sci
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