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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/resource.h"
#include "sci/engine/features.h"
#include "sci/engine/state.h"
#include "sci/engine/kernel.h"
#include "sci/engine/script.h"
#include "common/util.h"
namespace Sci {
#define END Script_None
opcode_format g_opcode_formats[128][4] = {
/*00*/
{Script_None}, {Script_None}, {Script_None}, {Script_None},
/*04*/
{Script_None}, {Script_None}, {Script_None}, {Script_None},
/*08*/
{Script_None}, {Script_None}, {Script_None}, {Script_None},
/*0C*/
{Script_None}, {Script_None}, {Script_None}, {Script_None},
/*10*/
{Script_None}, {Script_None}, {Script_None}, {Script_None},
/*14*/
{Script_None}, {Script_None}, {Script_None}, {Script_SRelative, END},
/*18*/
{Script_SRelative, END}, {Script_SRelative, END}, {Script_SVariable, END}, {Script_None},
/*1C*/
{Script_SVariable, END}, {Script_None}, {Script_None}, {Script_Variable, END},
/*20*/
{Script_SRelative, Script_Byte, END}, {Script_Variable, Script_Byte, END}, {Script_Variable, Script_Byte, END}, {Script_Variable, Script_SVariable, Script_Byte, END},
/*24 (24=ret)*/
{Script_End}, {Script_Byte, END}, {Script_Invalid}, {Script_Invalid},
/*28*/
{Script_Variable, END}, {Script_Invalid}, {Script_Byte, END}, {Script_Variable, Script_Byte, END},
/*2C*/
{Script_SVariable, END}, {Script_SVariable, Script_Variable, END}, {Script_None}, {Script_Invalid},
/*30*/
{Script_None}, {Script_Property, END}, {Script_Property, END}, {Script_Property, END},
/*34*/
{Script_Property, END}, {Script_Property, END}, {Script_Property, END}, {Script_Property, END},
/*38*/
{Script_Property, END}, {Script_SRelative, END}, {Script_SRelative, END}, {Script_None},
/*3C*/
{Script_None}, {Script_None}, {Script_None}, {Script_Word},
/*40-4F*/
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
/*50-5F*/
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
/*60-6F*/
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
/*70-7F*/
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END},
{Script_Global, END}, {Script_Local, END}, {Script_Temp, END}, {Script_Param, END}
};
#undef END
// TODO: script_adjust_opcode_formats should probably be part of the
// constructor (?) of a VirtualMachine or a ScriptManager class.
void script_adjust_opcode_formats(EngineState *s) {
// TODO: Check that this is correct
if (g_sci->_features->detectLofsType() != SCI_VERSION_0_EARLY) {
g_opcode_formats[op_lofsa][0] = Script_Offset;
g_opcode_formats[op_lofss][0] = Script_Offset;
}
#ifdef ENABLE_SCI32
// In SCI32, some arguments are now words instead of bytes
if (getSciVersion() >= SCI_VERSION_2) {
g_opcode_formats[op_calle][2] = Script_Word;
g_opcode_formats[op_callk][1] = Script_Word;
g_opcode_formats[op_super][1] = Script_Word;
g_opcode_formats[op_send][0] = Script_Word;
g_opcode_formats[op_self][0] = Script_Word;
g_opcode_formats[op_call][1] = Script_Word;
g_opcode_formats[op_callb][1] = Script_Word;
}
#endif
}
#define INST_LOOKUP_CLASS(id) ((id == 0xffff)? NULL_REG : segMan->getClassAddress(id, SCRIPT_GET_LOCK, reg))
void SegManager::createClassTable() {
Resource *vocab996 = _resMan->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;
}
_resMan->unlockResource(vocab996);
}
reg_t SegManager::getClassAddress(int classnr, ScriptLoadType lock, reg_t caller) {
if (classnr == 0xffff)
return NULL_REG;
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) {
getScriptSegment(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;
}
}
void SegManager::scriptInitialiseLocalsZero(SegmentId seg, int count) {
Script *scr = getScript(seg);
scr->_localsOffset = -count * 2; // Make sure it's invalid
LocalVariables *locals = allocLocalsSegment(scr, count);
if (locals) {
for (int i = 0; i < count; i++)
locals->_locals[i] = NULL_REG;
}
}
void SegManager::scriptInitialiseLocals(reg_t location) {
Script *scr = getScript(location.segment);
unsigned int count;
VERIFY(location.offset + 1 < (uint16)scr->_bufSize, "Locals beyond end of script\n");
if (getSciVersion() >= 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->_localsOffset = location.offset;
if (!(location.offset + count * 2 + 1 < scr->_bufSize)) {
warning("Locals extend beyond end of script: offset %04x, count %x vs size %x", location.offset, count, (uint)scr->_bufSize);
count = (scr->_bufSize - 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] = make_reg(0, READ_LE_UINT16(base + i * 2));
}
}
void SegManager::scriptRelocateExportsSci11(SegmentId seg) {
Script *scr = getScript(seg);
for (int i = 0; i < scr->_numExports; 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->_exportTable + i));
if ((location < scr->_heapSize - 1) && (READ_LE_UINT16(scr->_heapStart + location) == SCRIPT_OBJECT_MAGIC_NUMBER)) {
WRITE_LE_UINT16((byte *)(scr->_exportTable + i), location + scr->_heapStart - 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->_heapStart + 4 + READ_LE_UINT16(scr->_heapStart + 2) * 2;
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->_heapStart + 4 + READ_LE_UINT16(scr->_heapStart + 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 = scr->scriptObjInit(reg);
#if 0
if (obj->_variables[5].offset != 0xffff) {
obj->_variables[5] = INST_LOOKUP_CLASS(obj->_variables[5].offset);
baseObj = getObject(obj->_variables[5]);
obj->variable_names_nr = baseObj->variables_nr;
obj->_baseObj = baseObj->_baseObj;
}
#endif
// Copy base from species class, as we need its selector IDs
obj->setSuperClassSelector(
getClassAddress(obj->getSuperClassSelector().offset, SCRIPT_GET_LOCK, NULL_REG));
// 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->setClassScriptSelector(make_reg(0, scr->_nr));
seeker += READ_LE_UINT16(seeker + 2) * 2;
}
}
int script_instantiate_common(ResourceManager *resMan, SegManager *segMan, int script_nr, Resource **script, Resource **heap, int *was_new) {
*was_new = 1;
*script = resMan->findResource(ResourceId(kResourceTypeScript, script_nr), 0);
if (getSciVersion() >= SCI_VERSION_1_1)
*heap = resMan->findResource(ResourceId(kResourceTypeHeap, script_nr), 0);
if (!*script || (getSciVersion() >= SCI_VERSION_1_1 && !heap)) {
warning("Script 0x%x requested but not found", script_nr);
if (getSciVersion() >= SCI_VERSION_1_1) {
if (*heap)
warning("Inconsistency: heap resource WAS found");
else if (*script)
warning("Inconsistency: script resource WAS found");
}
return 0;
}
SegmentId seg_id = segMan->getScriptSegment(script_nr);
Script *scr = segMan->getScriptIfLoaded(seg_id);
if (scr) {
if (!scr->isMarkedAsDeleted()) {
scr->incrementLockers();
return seg_id;
} else {
scr->freeScript();
}
} else {
scr = segMan->allocateScript(script_nr, &seg_id);
if (!scr) { // ALL YOUR SCRIPT BASE ARE BELONG TO US
error("Not enough heap space for script size 0x%x of script 0x%x (Should this happen?)", (*script)->size, script_nr);
return 0;
}
}
scr->init(script_nr, resMan);
reg_t reg;
reg.segment = seg_id;
reg.offset = 0;
// Set heap position (beyond the size word)
scr->setLockers(1);
scr->setExportTableOffset(0);
scr->setSynonymsOffset(0);
scr->setSynonymsNr(0);
*was_new = 0;
return seg_id;
}
int script_instantiate_sci0(ResourceManager *resMan, SegManager *segMan, int script_nr) {
int objtype;
unsigned int objlength;
int relocation = -1;
int magic_pos_adder; // Usually 0; 2 for older SCI versions
Resource *script;
int was_new;
bool oldScriptHeader = (getSciVersion() == SCI_VERSION_0_EARLY);
const int seg_id = script_instantiate_common(resMan, segMan, script_nr, &script, NULL, &was_new);
if (was_new)
return seg_id;
Script *scr = segMan->getScript(seg_id);
if (oldScriptHeader) {
//
int locals_nr = READ_LE_UINT16(script->data);
// Old script block
// There won't be a localvar block in this case
// Instead, the script starts with a 16 bit int specifying the
// number of locals we need; these are then allocated and zeroed.
scr->mcpyInOut(0, script->data, script->size);
magic_pos_adder = 2; // Step over the funny prefix
if (locals_nr)
segMan->scriptInitialiseLocalsZero(seg_id, locals_nr);
} else {
scr->mcpyInOut(0, script->data, script->size);
magic_pos_adder = 0;
}
// Now do a first pass through the script objects to find the
// export table and local variable block
reg_t reg;
reg.segment = seg_id;
reg.offset = magic_pos_adder;
objlength = 0;
do {
reg_t data_base;
reg_t addr;
reg.offset += objlength; // Step over the last checked object
objtype = scr->getHeap(reg.offset);
if (!objtype)
break;
objlength = scr->getHeap(reg.offset + 2);
// This happens in some demos (e.g. the EcoQuest 1 demo). Not sure what is the
// actual cause of it, but the scripts of these demos can't be loaded properly
// and we're stuck forever in this loop, as objlength never changes
if (!objlength) {
warning("script_instantiate_sci0: objlength is 0, unable to parse script");
return 0;
}
data_base = reg;
data_base.offset += 4;
addr = data_base;
switch (objtype) {
case SCI_OBJ_EXPORTS: {
scr->setExportTableOffset(data_base.offset);
}
break;
case SCI_OBJ_SYNONYMS:
scr->setSynonymsOffset(addr.offset); // +4 is to step over the header
scr->setSynonymsNr((objlength) / 4);
break;
case SCI_OBJ_LOCALVARS:
segMan->scriptInitialiseLocals(data_base);
break;
case SCI_OBJ_CLASS: {
int classpos = addr.offset - SCRIPT_OBJECT_MAGIC_OFFSET;
int species;
species = scr->getHeap(addr.offset - SCRIPT_OBJECT_MAGIC_OFFSET + SCRIPT_SPECIES_OFFSET);
if (species < 0 || species >= (int)segMan->_classtable.size()) {
if (species == (int)segMan->_classtable.size()) {
// Happens in the LSL2 demo
warning("Applying workaround for an off-by-one invalid species access");
segMan->_classtable.resize(segMan->_classtable.size() + 1);
} else {
warning("Invalid species %d(0x%x) not in interval "
"[0,%d) while instantiating script %d\n",
species, species, segMan->_classtable.size(),
script_nr);
return 0;
}
}
segMan->_classtable[species].reg = addr;
segMan->_classtable[species].reg.offset = classpos;
// Set technical class position-- into the block allocated for it
}
break;
default:
break;
}
} while (objtype != 0);
// And now a second pass to adjust objects and class pointers, and the general pointers
objlength = 0;
reg.offset = magic_pos_adder; // Reset counter
do {
reg_t addr;
reg.offset += objlength; // Step over the last checked object
objtype = scr->getHeap(reg.offset);
if (!objtype)
break;
objlength = scr->getHeap(reg.offset + 2);
addr = reg;
addr.offset += 4; // Step over header
switch (objtype) {
case SCI_OBJ_CODE:
scr->scriptAddCodeBlock(addr);
break;
case SCI_OBJ_OBJECT:
case SCI_OBJ_CLASS: { // object or class?
Object *obj = scr->scriptObjInit(addr);
// Instantiate the superclass, if neccessary
obj->setSpeciesSelector(INST_LOOKUP_CLASS(obj->getSpeciesSelector().offset));
Object *baseObj = segMan->getObject(obj->getSpeciesSelector());
if (baseObj) {
obj->setVarCount(baseObj->getVarCount());
// Copy base from species class, as we need its selector IDs
obj->_baseObj = baseObj->_baseObj;
obj->setSuperClassSelector(INST_LOOKUP_CLASS(obj->getSuperClassSelector().offset));
} else {
warning("Failed to locate base object for object at %04X:%04X; skipping", PRINT_REG(addr));
scr->scriptObjRemove(addr);
}
} // if object or class
break;
case SCI_OBJ_POINTERS: // A relocation table
relocation = addr.offset;
break;
default:
break;
}
} while (objtype != 0 && reg.offset < script->size - 2);
if (relocation >= 0)
scr->scriptRelocate(make_reg(seg_id, relocation));
return reg.segment; // instantiation successful
}
int script_instantiate_sci11(ResourceManager *resMan, SegManager *segMan, int script_nr) {
Resource *script, *heap;
int _heapStart;
reg_t reg;
int was_new;
const int seg_id = script_instantiate_common(resMan, segMan, script_nr, &script, &heap, &was_new);
if (was_new)
return seg_id;
Script *scr = segMan->getScript(seg_id);
_heapStart = script->size;
if (script->size & 2)
_heapStart ++;
scr->mcpyInOut(0, script->data, script->size);
scr->mcpyInOut(_heapStart, heap->data, heap->size);
if (READ_LE_UINT16(script->data + 6) > 0)
scr->setExportTableOffset(6);
reg.segment = seg_id;
reg.offset = _heapStart + 4;
segMan->scriptInitialiseLocals(reg);
segMan->scriptRelocateExportsSci11(seg_id);
segMan->scriptInitialiseObjectsSci11(seg_id);
reg.offset = READ_LE_UINT16(heap->data);
scr->heapRelocate(reg);
return seg_id;
}
int script_instantiate(ResourceManager *resMan, SegManager *segMan, int script_nr) {
if (getSciVersion() >= SCI_VERSION_1_1)
return script_instantiate_sci11(resMan, segMan, script_nr);
else
return script_instantiate_sci0(resMan, segMan, script_nr);
}
void script_uninstantiate_sci0(SegManager *segMan, int script_nr, SegmentId seg) {
bool oldScriptHeader = (getSciVersion() == SCI_VERSION_0_EARLY);
reg_t reg = make_reg(seg, oldScriptHeader ? 2 : 0);
int objtype, objlength;
Script *scr = segMan->getScript(seg);
// Make a pass over the object in order uninstantiate all superclasses
objlength = 0;
do {
reg.offset += objlength; // Step over the last checked object
objtype = scr->getHeap(reg.offset);
if (!objtype)
break;
objlength = scr->getHeap(reg.offset + 2); // use SEG_UGET_HEAP ??
reg.offset += 4; // Step over header
if ((objtype == SCI_OBJ_OBJECT) || (objtype == SCI_OBJ_CLASS)) { // object or class?
int superclass;
reg.offset -= SCRIPT_OBJECT_MAGIC_OFFSET;
superclass = scr->getHeap(reg.offset + SCRIPT_SUPERCLASS_OFFSET); // Get superclass...
if (superclass >= 0) {
int superclass_script = segMan->_classtable[superclass].script;
if (superclass_script == script_nr) {
if (scr->getLockers())
scr->decrementLockers(); // Decrease lockers if this is us ourselves
} else
script_uninstantiate(segMan, superclass_script);
// Recurse to assure that the superclass lockers number gets decreased
}
reg.offset += SCRIPT_OBJECT_MAGIC_OFFSET;
} // if object or class
reg.offset -= 4; // Step back on header
} while (objtype != 0);
}
void script_uninstantiate(SegManager *segMan, int script_nr) {
SegmentId segment = segMan->getScriptSegment(script_nr);
Script *scr = segMan->getScriptIfLoaded(segment);
if (!scr) { // Is it already loaded?
//warning("unloading script 0x%x requested although not loaded", script_nr);
// This is perfectly valid SCI behaviour
return;
}
scr->decrementLockers(); // One less locker
if (scr->getLockers() > 0)
return;
// Free all classtable references to this script
for (uint i = 0; i < segMan->_classtable.size(); i++)
if (segMan->_classtable[i].reg.segment == segment)
segMan->_classtable[i].reg = NULL_REG;
if (getSciVersion() < SCI_VERSION_1_1)
script_uninstantiate_sci0(segMan, script_nr, segment);
// FIXME: Add proper script uninstantiation for SCI 1.1
if (scr->getLockers())
return; // if xxx.lockers > 0
// Otherwise unload it completely
// Explanation: I'm starting to believe that this work is done by SCI itself.
scr->markDeleted();
debugC(kDebugLevelScripts, "Unloaded script 0x%x.", script_nr);
return;
}
} // End of namespace Sci
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