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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/scicore/resource.h"
#include "sci/include/engine.h"
#include "sci/engine/kernel_types.h"
#include "sci/engine/kernel.h"
namespace Sci {
reg_t read_selector(EngineState *s, reg_t object, selector_t selector_id, const char *file, int line) {
reg_t *address;
if (lookup_selector(s, object, selector_id, &address, NULL) != SELECTOR_VARIABLE)
return NULL_REG;
else
return *address;
}
void write_selector(EngineState *s, reg_t object, selector_t selector_id, reg_t value, const char *fname, int line) {
reg_t *address;
if ((selector_id < 0) || (selector_id > (int)s->_selectorNames.size())) {
warning("Attempt to write to invalid selector %d of"
" object at "PREG" (%s L%d).", selector_id, PRINT_REG(object), fname, line);
return;
}
if (lookup_selector(s, object, selector_id, &address, NULL) != SELECTOR_VARIABLE)
warning("Selector '%s' of object at "PREG" could not be"
" written to (%s L%d)", s->_selectorNames[selector_id].c_str(), PRINT_REG(object), fname, line);
else
*address = value;
}
int invoke_selector(EngineState *s, reg_t object, int selector_id, int noinvalid, int kfunct,
stack_ptr_t k_argp, int k_argc, const char *fname, int line, int argc, ...) {
va_list argp;
int i;
int framesize = 2 + 1 * argc;
reg_t address;
int slc_type;
stack_ptr_t stackframe = k_argp + k_argc;
exec_stack_t *xstack; // Execution stack
stackframe[0] = make_reg(0, selector_id); // The selector we want to call
stackframe[1] = make_reg(0, argc); // Argument count
slc_type = lookup_selector(s, object, selector_id, NULL, &address);
if (slc_type == SELECTOR_NONE) {
SCIkwarn(SCIkERROR, "Selector '%s' of object at "PREG" could not be invoked (%s L%d)\n",
s->_selectorNames[selector_id].c_str(), PRINT_REG(object), fname, line);
if (noinvalid == 0)
KERNEL_OOPS("Not recoverable: VM was halted\n");
return 1;
}
if (slc_type == SELECTOR_VARIABLE) // Swallow silently
return 0;
va_start(argp, argc);
for (i = 0; i < argc; i++) {
reg_t arg = va_arg(argp, reg_t);
stackframe[2 + i] = arg; // Write each argument
}
va_end(argp);
// Write "kernel" call to the stack, for debugging:
xstack = add_exec_stack_entry(s, NULL_REG, NULL, NULL_REG, k_argc, k_argp - 1, 0, NULL_REG,
s->execution_stack_pos, SCI_XS_CALLEE_LOCALS);
xstack->selector = -42 - kfunct; // Evil debugging hack to identify kernel function
xstack->type = EXEC_STACK_TYPE_KERNEL;
// Now commit the actual function:
xstack = send_selector(s, object, object, stackframe, framesize, stackframe);
xstack->sp += argc + 2;
xstack->fp += argc + 2;
run_vm(s, 0); // Start a new vm
--(s->execution_stack_pos); // Get rid of the extra stack entry
return 0;
}
bool is_object(EngineState *s, reg_t object) {
return obj_get(s, object) != NULL;
}
// Loads arbitrary resources of type 'restype' with resource numbers 'resnrs'
// This implementation ignores all resource numbers except the first one.
reg_t kLoad(EngineState *s, int funct_nr, int argc, reg_t *argv) {
int restype = KP_UINT(argv[0]);
int resnr = KP_UINT(argv[1]);
if (restype == sci_memory) // Request to dynamically allocate hunk memory for later use
return kalloc(s, "kLoad()", resnr);
return make_reg(0, ((restype << 11) | resnr)); // Return the resource identifier as handle
}
reg_t kLock(EngineState *s, int funct_nr, int argc, reg_t *argv) {
int restype = UKPV(0) & 0x7f;
int resnr = UKPV(1);
int state = argc > 2 ? UKPV(2) : 1;
resource_t *which;
switch (state) {
case 1 :
scir_find_resource(s->resmgr, restype, resnr, 1);
break;
case 0 :
which = scir_find_resource(s->resmgr, restype, resnr, 0);
scir_unlock_resource(s->resmgr, which, resnr, restype);
break;
}
return s->r_acc;
}
// Unloads an arbitrary resource of type 'restype' with resource numbber 'resnr'
reg_t kUnLoad(EngineState *s, int funct_nr, int argc, reg_t *argv) {
int restype = KP_UINT(argv[0]);
reg_t resnr = argv[1];
if (restype == sci_memory)
kfree(s, resnr);
return s->r_acc;
}
reg_t kClone(EngineState *s, int funct_nr, int argc, reg_t *argv) {
reg_t parent_addr = argv[0];
object_t *parent_obj = obj_get(s, parent_addr);
reg_t clone_addr;
clone_t *clone_obj; // same as object_t*
int varblock_size;
if (!parent_obj) {
SCIkwarn(SCIkERROR, "Attempt to clone non-object/class at "PREG" failed", PRINT_REG(parent_addr));
return NULL_REG;
}
SCIkdebug(SCIkMEM, "Attempting to clone from "PREG"\n", PRINT_REG(parent_addr));
clone_obj = s->seg_manager->alloc_clone(&clone_addr);
if (!clone_obj) {
SCIkwarn(SCIkERROR, "Cloning "PREG" failed-- internal error!\n", PRINT_REG(parent_addr));
return NULL_REG;
}
memcpy(clone_obj, parent_obj, sizeof(clone_t));
clone_obj->flags = 0;
varblock_size = parent_obj->variables_nr * sizeof(reg_t);
clone_obj->variables = (reg_t*)sci_malloc(varblock_size);
memcpy(clone_obj->variables, parent_obj->variables, varblock_size);
// Mark as clone
clone_obj->variables[SCRIPT_INFO_SELECTOR].offset = SCRIPT_INFO_CLONE;
clone_obj->variables[SCRIPT_SPECIES_SELECTOR] = clone_obj->pos;
if (IS_CLASS(parent_obj))
clone_obj->variables[SCRIPT_SUPERCLASS_SELECTOR] = parent_obj->pos;
s->seg_manager->incrementLockers(parent_obj->pos.segment, SEG_ID);
s->seg_manager->incrementLockers(clone_obj->pos.segment, SEG_ID);
return clone_addr;
}
extern void _k_view_list_mark_free(EngineState *s, reg_t off);
reg_t kDisposeClone(EngineState *s, int funct_nr, int argc, reg_t *argv) {
reg_t victim_addr = argv[0];
clone_t *victim_obj = obj_get(s, victim_addr);
uint16 underBits;
if (!victim_obj) {
SCIkwarn(SCIkERROR, "Attempt to dispose non-class/object at "PREG"\n",
PRINT_REG(victim_addr));
return s->r_acc;
}
if (victim_obj->variables[SCRIPT_INFO_SELECTOR].offset != SCRIPT_INFO_CLONE) {
//SCIkwarn("Attempt to dispose something other than a clone at %04x\n", offset);
// SCI silently ignores this behaviour; some games actually depend on it
return s->r_acc;
}
underBits = GET_SEL32V(victim_addr, underBits);
if (underBits) {
warning("Clone "PREG" was cleared with underBits set", PRINT_REG(victim_addr));
}
#if 0
if (s->dyn_views) { // Free any widget associated with the clone
gfxw_widget_t *widget = gfxw_set_id(gfxw_remove_ID(s->dyn_views, offset), GFXW_NO_ID);
if (widget && s->bg_widgets)
s->bg_widgets->add(GFXWC(s->bg_widgets), widget);
}
#endif
victim_obj->flags |= OBJECT_FLAG_FREED;
_k_view_list_mark_free(s, victim_addr); // Free on view list, if neccessary
return s->r_acc;
}
// Returns script dispatch address index in the supplied script
reg_t kScriptID(EngineState *s, int funct_nr, int argc, reg_t *argv) {
int script = KP_UINT(argv[0]);
int index = KP_UINT(KP_ALT(1, NULL_REG));
seg_id_t scriptid = script_get_segment(s, script, SCRIPT_GET_LOAD);
script_t *scr;
if (argv[0].segment)
return argv[0];
if (!scriptid)
return NULL_REG;
scr = &(s->seg_manager->heap[scriptid]->data.script);
if (!scr->exports_nr) {
SCIkdebug(SCIkERROR, "Script 0x%x does not have a dispatch table\n", script);
return NULL_REG;
}
if (index > scr->exports_nr) {
SCIkwarn(SCIkERROR, "Dispatch index too big: %d > %d\n", index, scr->exports_nr);
return NULL_REG;
}
return make_reg(scriptid, s->seg_manager->validateExportFunc(index, scriptid));
}
reg_t kDisposeScript(EngineState *s, int funct_nr, int argc, reg_t *argv) {
int script = argv[0].offset;
// Work around QfG1 graveyard bug
if (argv[0].segment)
return s->r_acc;
if (s->seg_manager->scriptIsLoaded(script, SCRIPT_ID)) {
int id = s->seg_manager->segGet(script);
if (s->execution_stack[s->execution_stack_pos].addr.pc.segment != id)
s->seg_manager->setLockers(1, script, SCRIPT_ID);
}
script_uninstantiate(s, script);
s->execution_stack_pos_changed = 1;
return s->r_acc;
}
int is_heap_object(EngineState *s, reg_t pos) {
object_t *obj = obj_get(s, pos);
return (obj != NULL && (!(obj->flags & OBJECT_FLAG_FREED)) && (!s->seg_manager->scriptIsMarkedAsDeleted(pos.segment)));
}
reg_t kIsObject(EngineState *s, int funct_nr, int argc, reg_t *argv) {
if (argv[0].offset == 0xffff) // Treated specially
return NULL_REG;
else
return make_reg(0, is_heap_object(s, argv[0]));
}
reg_t kRespondsTo(EngineState *s, int funct_nr, int argc, reg_t *argv) {
reg_t obj = argv[0];
int selector = KP_UINT(argv[1]);
return make_reg(0, is_heap_object(s, obj) && lookup_selector(s, obj, selector, NULL, NULL) != SELECTOR_NONE);
}
} // End of namespace Sci
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