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scummvm/engines/sci/engine/vm.cpp
Filippos Karapetis 2ddce51a56 Changed more messages to warnings/errors 
svn-id: r38621
2009-02-20 20:39:02 +00:00

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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 "common/debug.h"
#include "sci/include/sciresource.h"
#include "sci/include/engine.h"
#include "sci/include/versions.h"
#include "sci/include/kdebug.h"
#include "sci/engine/kernel_types.h"
#include "sci/engine/seg_manager.h"
#include "sci/engine/gc.h"
#include "sci/include/sfx_player.h"
#ifdef HAVE_SETJMP_H
#include <setjmp.h>
#endif
reg_t NULL_REG = NULL_REG_INITIALIZER;
/*#define VM_DEBUG_SEND*/
#undef STRICT_SEND /* Disallows variable sends with more than one parameter */
#undef STRICT_READ /* Disallows reading from out-of-bounds parameters and locals */
int script_abort_flag = 0; /* Set to 1 to abort execution */
int script_error_flag = 0; /* Set to 1 if an error occured, reset each round by the VM */
int script_checkloads_flag = 0; /* Print info when scripts get (un)loaded */
int script_step_counter = 0; /* Counts the number of steps executed */
int script_gc_interval = GC_INTERVAL; /* Number of steps in between gcs */
extern int _debug_step_running; /* scriptdebug.c */
extern int _debug_seeking; /* scriptdebug.c */
extern int _weak_validations; /* scriptdebug.c */
calls_struct_t *send_calls = NULL;
int send_calls_allocated = 0;
int bp_flag = 0;
static reg_t _dummy_register = NULL_REG_INITIALIZER;
#ifdef HAVE_SETJMP_H
static int jump_initialized = 0;
static jmp_buf vm_error_address;
#endif
/*-- validation functionality --*/
#ifndef DISABLE_VALIDATIONS
static inline reg_t *
validate_property(object_t *obj, int index) {
if (!obj) {
if (sci_debug_flags & 4)
sciprintf("[VM] Sending to disposed object");
_dummy_register = NULL_REG;
return &_dummy_register;
}
if (index < 0 || index >= obj->variables_nr) {
if (sci_debug_flags & 4)
sciprintf("[VM] Invalid property #%d (out of [0..%d]) requested", index,
obj->variables_nr);
_dummy_register = NULL_REG;
return &_dummy_register;
}
return obj->variables + index;
}
static inline stack_ptr_t
validate_stack_addr(state_t *s, stack_ptr_t sp) {
if (sp >= s->stack_base && sp < s->stack_top)
return sp;
script_debug_flag = script_error_flag = 1;
if (sci_debug_flags & 4)
sciprintf("[VM] Stack index %d out of valid range [%d..%d]\n",
sp - s->stack_base, 0, s->stack_top - s->stack_base - 1);
return 0;
}
static inline int
validate_arithmetic(reg_t reg) {
if (reg.segment) {
if (!_weak_validations)
script_debug_flag = script_error_flag = 1;
if (sci_debug_flags & 4)
sciprintf("[VM] Attempt to read arithmetic value from non-zero segment [%04x]\n", reg.segment);
return 0;
}
return reg.offset;
}
static inline int
signed_validate_arithmetic(reg_t reg) {
if (reg.segment) {
if (!_weak_validations)
script_debug_flag = script_error_flag = 1;
if (sci_debug_flags & 4)
sciprintf("[VM] Attempt to read arithmetic value from non-zero segment [%04x]\n", reg.segment);
return 0;
}
if (reg.offset&0x8000)
return (signed)(reg.offset) - 65536;
else
return reg.offset;
}
static inline int
validate_variable(reg_t *r, reg_t *stack_base, int type, int max, int index, int line) {
const char *names[4] = {"global", "local", "temp", "param"};
if (index < 0 || index >= max) {
sciprintf("[VM] Attempt to use invalid %s variable %04x ", names[type], index);
if (max == 0)
sciprintf("(variable type invalid)");
else
sciprintf("(out of range [%d..%d])", 0, max - 1);
sciprintf(" in %s, line %d\n", __FILE__, line);
if (!_weak_validations)
script_debug_flag = script_error_flag = 1;
#ifdef STRICT_READ
return 1;
#else /* !STRICT_READ */
if (type == VAR_PARAM || type == VAR_TEMP) {
int total_offset = r - stack_base;
if (total_offset < 0 || total_offset >= VM_STACK_SIZE) {
sciprintf("[VM] Access would be outside even of the stack (%d); access denied\n",
total_offset);
return 1;
} else {
sciprintf("[VM] Access within stack boundaries; access granted.\n");
return 0;
}
};
#endif
}
return 0;
}
static inline reg_t
validate_read_var(reg_t *r, reg_t *stack_base, int type, int max, int index, int line, reg_t default_value) {
if (!validate_variable(r, stack_base, type, max, index, line))
return r[index];
else
return default_value;
}
static inline void
validate_write_var(reg_t *r, reg_t *stack_base, int type, int max, int index, int line, reg_t value) {
if (!validate_variable(r, stack_base, type, max, index, line))
r[index] = value;
}
# define ASSERT_ARITHMETIC(v) validate_arithmetic(v)
#else
/*-- Non-validating alternatives -- */
# define validate_stack_addr(s, sp) sp
# define validate_arithmetic(r) ((r).offset)
# define signed_validate_arithmetic(r) ((int) ((r).offset)&0x8000 ? (signed) ((r).offset)-65536 : ((r).offset))
# define validate_variable(r, sb, t, m, i, l)
# define validate_read_var(r, sb, t, m, i, l) ((r)[i])
# define validate_write_var(r, sb, t, m, i, l, v) ((r)[i] = (v))
# define validate_property(o, p) (&((o)->variables[p]))
# define ASSERT_ARITHMETIC(v) (v).offset
#endif
#define READ_VAR(type, index, def) validate_read_var(variables[type], s->stack_base, type, variables_max[type], index, __LINE__, def)
#define WRITE_VAR(type, index, value) validate_write_var(variables[type], s->stack_base, type, variables_max[type], index, __LINE__, value)
#define WRITE_VAR16(type, index, value) WRITE_VAR(type, index, make_reg(0, value));
#define ACC_ARITHMETIC_L(op) make_reg(0, (op validate_arithmetic(s->r_acc)))
#define ACC_AUX_LOAD() aux_acc = signed_validate_arithmetic(s->r_acc)
#define ACC_AUX_STORE() s->r_acc = make_reg(0, aux_acc)
#define OBJ_PROPERTY(o, p) (*validate_property(o, p))
/*==--------------------------==*/
int
script_error(state_t *s, const char *file, int line, const char *reason) {
sciprintf("Script error in file %s, line %d: %s\n", file, line, reason);
script_debug_flag = script_error_flag = 1;
return 0;
}
#define CORE_ERROR(area, msg) script_error(s, "[" area "] " __FILE__, __LINE__, msg)
reg_t
get_class_address(state_t *s, int classnr, int lock, reg_t caller) {
class_t *the_class = s->classtable + classnr;
if (NULL == s) {
sciprintf("vm.c: get_class_address(): NULL passed for \"s\"\n");
return NULL_REG;
}
if (classnr < 0
|| s->classtable_size <= classnr
|| the_class->script < 0) {
sciprintf("[VM] Attempt to dereference class %x, which doesn't exist (max %x)\n",
classnr, s->classtable_size);
script_error_flag = script_debug_flag = 1;
return NULL_REG;
} else {
if (!the_class->reg.segment) {
script_get_segment(s, the_class->script, lock);
if (!the_class->reg.segment) {
sciprintf("[VM] Trying to instantiate class %x by instantiating script 0x%x (%03d) failed;"
" Entering debugger.\n", classnr, the_class->script);
script_error_flag = script_debug_flag = 1;
return NULL_REG;
}
} else
if (caller.segment != the_class->reg.segment)
sm_increment_lockers(&s->seg_manager, the_class->reg.segment, SEG_ID);
return the_class->reg;
}
}
/* Operating on the stack */
/* 16 bit: */
#define PUSH(v) PUSH32(make_reg(0, v))
#define POP() (validate_arithmetic(POP32()))
/* 32 bit: */
#define PUSH32(a) (*(validate_stack_addr(s, (xs->sp)++)) = (a))
#define POP32() (*(validate_stack_addr(s, --(xs->sp))))
/* Getting instruction parameters */
#define GET_OP_BYTE() ((guint8) code_buf[(xs->addr.pc.offset)++])
#define GET_OP_WORD() (getUInt16(code_buf + ((xs->addr.pc.offset) += 2) - 2))
#define GET_OP_FLEX() ((opcode & 1)? GET_OP_BYTE() : GET_OP_WORD())
#define GET_OP_SIGNED_BYTE() ((gint8)(code_buf[(xs->addr.pc.offset)++]))
#define GET_OP_SIGNED_WORD() ((getInt16(code_buf + ((xs->addr.pc.offset) += 2) - 2)))
#define GET_OP_SIGNED_FLEX() ((opcode & 1)? GET_OP_SIGNED_BYTE() : GET_OP_SIGNED_WORD())
#define SEG_GET_HEAP( s, reg ) sm_get_heap( &s->seg_manager, reg )
#define OBJ_SPECIES(s, reg) SEG_GET_HEAP(s, make_reg(reg.segment, reg.offset + SCRIPT_SPECIES_OFFSET))
/* Returns an object's species */
#define OBJ_SUPERCLASS(s, reg) SEG_GET_HEAP(s, make_reg(reg.segment, reg.offset + SCRIPT_SUPERCLASS_OFFSET))
/* Returns an object's superclass */
inline exec_stack_t *
execute_method(state_t *s, word script, word pubfunct, stack_ptr_t sp,
reg_t calling_obj, word argc, stack_ptr_t argp) {
int seg;
guint16 temp;
if (!sm_script_is_loaded(&s->seg_manager, script, SCRIPT_ID)) /* Script not present yet? */
script_instantiate(s, script);
else
sm_unmark_script_deleted(&s->seg_manager, script);
seg = sm_seg_get(&s->seg_manager, script);
temp = sm_validate_export_func(&s->seg_manager, pubfunct, seg);
VERIFY(temp, "Invalid pubfunct in export table");
if (!temp) {
sciprintf("Request for invalid exported function 0x%x of script 0x%x\n", pubfunct, script);
script_error_flag = script_debug_flag = 1;
return NULL;
}
/* Check if a breakpoint is set on this method */
if (s->have_bp & BREAK_EXPORT) {
breakpoint_t *bp;
guint32 bpaddress;
bpaddress = (script << 16 | pubfunct);
bp = s->bp_list;
while (bp) {
if (bp->type == BREAK_EXPORT && bp->data.address == bpaddress) {
sciprintf("Break on script %d, export %d\n", script, pubfunct);
script_debug_flag = 1;
bp_flag = 1;
break;
}
bp = bp->next;
}
}
return add_exec_stack_entry(s, make_reg(seg, temp),
sp, calling_obj, argc, argp, -1, calling_obj,
s->execution_stack_pos, seg);
}
static void
_exec_varselectors(state_t *s) { /* Executes all varselector read/write ops on the TOS */
/* Now check the TOS to execute all varselector entries */
if (s->execution_stack_pos >= 0)
while (s->execution_stack[s->execution_stack_pos].type == EXEC_STACK_TYPE_VARSELECTOR) {
/* varselector access? */
if (s->execution_stack[s->execution_stack_pos].argc) { /* write? */
reg_t temp = s->execution_stack[s->execution_stack_pos].variables_argp[1];
*(s->execution_stack[s->execution_stack_pos].addr.varp) = temp;
} else /* No, read */
s->r_acc = *(s->execution_stack[s->execution_stack_pos].addr.varp);
--(s->execution_stack_pos);
}
}
exec_stack_t *
send_selector(state_t *s, reg_t send_obj, reg_t work_obj,
stack_ptr_t sp, int framesize, stack_ptr_t argp)
/* send_obj and work_obj are equal for anything but 'super' */
/* Returns a pointer to the TOS exec_stack element */
{
#ifdef VM_DEBUG_SEND
int i;
#endif
reg_t *varp;
reg_t funcp;
int selector;
int argc;
int origin = s->execution_stack_pos; /* Origin: Used for debugging */
exec_stack_t *retval = s->execution_stack + s->execution_stack_pos;
int print_send_action = 0;
/* We return a pointer to the new active exec_stack_t */
/* The selector calls we catch are stored below: */
int send_calls_nr = -1;
if (NULL == s) {
sciprintf("vm.c: exec_stack_t(): NULL passed for \"s\"\n");
return NULL;
}
while (framesize > 0) {
selector = validate_arithmetic(*argp++);
argc = validate_arithmetic(*argp);
if (argc > 0x800) { /* More arguments than the stack could possibly accomodate for */
CORE_ERROR("SEND", "More than 0x800 arguments to function call\n");
return NULL;
}
/* Check if a breakpoint is set on this method */
if (s->have_bp & BREAK_SELECTOR) {
breakpoint_t *bp;
char method_name [256];
sprintf(method_name, "%s::%s",
obj_get_name(s, send_obj),
s->selector_names [selector]);
bp = s->bp_list;
while (bp) {
int cmplen = strlen(bp->data.name);
if (bp->data.name[cmplen - 1] != ':')
cmplen = 256;
if (bp->type == BREAK_SELECTOR && !strncmp(bp->data.name, method_name, cmplen)) {
sciprintf("Break on %s (in ["PREG"])\n", method_name,
PRINT_REG(send_obj));
script_debug_flag = print_send_action = 1;
bp_flag = 1;
break;
}
bp = bp->next;
}
}
#ifdef VM_DEBUG_SEND
sciprintf("Send to "PREG", selector %04x (%s):",
PRINT_REG(send_obj), selector, s->selector_names[selector]);
#endif /* VM_DEBUG_SEND */
if (++send_calls_nr == (send_calls_allocated - 1))
send_calls = (calls_struct_t*)sci_realloc(send_calls, sizeof(calls_struct_t)
* (send_calls_allocated *= 2));
switch (lookup_selector(s, send_obj, selector, &varp, &funcp)) {
case SELECTOR_NONE:
sciprintf("Send to invalid selector 0x%x of object at "PREG"\n",
0xffff & selector, PRINT_REG(send_obj));
script_error_flag = script_debug_flag = 1;
--send_calls_nr;
break;
case SELECTOR_VARIABLE:
#ifdef VM_DEBUG_SEND
sciprintf("Varselector: ");
if (argc)
sciprintf("Write "PREG"\n", PRINT_REG(argp[1]));
else
sciprintf("Read\n");
#endif /* VM_DEBUG_SEND */
switch (argc) {
case 0: /* Read selector */
if (print_send_action) {
sciprintf("[read selector]\n");
print_send_action = 0;
}
/* fallthrough */
case 1:
#ifndef STRICT_SEND
default:
#endif
{ /* Argument is supplied -> Selector should be set */
if (print_send_action) {
reg_t oldReg = *varp;
reg_t newReg = argp[1];
sciprintf("[write to selector: change "PREG" to "PREG"]\n",
PRINT_REG(oldReg), PRINT_REG(newReg));
print_send_action = 0;
}
send_calls[send_calls_nr].address.var = varp; /* register the call */
send_calls[send_calls_nr].argp = argp;
send_calls[send_calls_nr].argc = argc;
send_calls[send_calls_nr].selector = selector;
send_calls[send_calls_nr].type = EXEC_STACK_TYPE_VARSELECTOR; /* Register as a varselector */
} break;
#ifdef STRICT_SEND
default:
--send_calls_nr;
sciprintf("Send error: Variable selector %04x in "PREG" called with %04x params\n",
selector, PRINT_REG(send_obj), argc);
script_debug_flag = 1; /* Enter debug mode */
_debug_seeking = _debug_step_running = 0;
#endif
}
break;
case SELECTOR_METHOD:
#ifdef VM_DEBUG_SEND
sciprintf("Funcselector(");
for (i = 0; i < argc; i++) {
sciprintf(PREG, PRINT_REG(argp[i+1]));
if (i + 1 < argc)
sciprintf(", ");
}
sciprintf(") at "PREG"\n", PRINT_REG(funcp));
#endif /* VM_DEBUG_SEND */
if (print_send_action) {
sciprintf("[invoke selector]\n");
print_send_action = 0;
}
send_calls[send_calls_nr].address.func = funcp; /* register call */
send_calls[send_calls_nr].argp = argp;
send_calls[send_calls_nr].argc = argc;
send_calls[send_calls_nr].selector = selector;
send_calls[send_calls_nr].type = EXEC_STACK_TYPE_CALL;
send_calls[send_calls_nr].sp = sp;
sp = CALL_SP_CARRY; /* Destroy sp, as it will be carried over */
break;
} /* switch(lookup_selector()) */
framesize -= (2 + argc);
argp += argc + 1;
}
/* Iterate over all registered calls in the reverse order. This way, the first call is
** placed on the TOS; as soon as it returns, it will cause the second call to be executed.
*/
for (; send_calls_nr >= 0; send_calls_nr--)
if (send_calls[send_calls_nr].type == EXEC_STACK_TYPE_VARSELECTOR) /* Write/read variable? */
retval = add_exec_stack_varselector(s, work_obj, send_calls[send_calls_nr].argc,
send_calls[send_calls_nr].argp,
send_calls[send_calls_nr].selector,
send_calls[send_calls_nr].address.var, origin);
else
retval =
add_exec_stack_entry(s, send_calls[send_calls_nr].address.func,
send_calls[send_calls_nr].sp, work_obj,
send_calls[send_calls_nr].argc,
send_calls[send_calls_nr].argp,
send_calls[send_calls_nr].selector,
send_obj, origin,
SCI_XS_CALLEE_LOCALS);
_exec_varselectors(s);
retval = s->execution_stack + s->execution_stack_pos;
return retval;
}
exec_stack_t *
add_exec_stack_varselector(state_t *s, reg_t objp, int argc, stack_ptr_t argp,
selector_t selector, reg_t *address, int origin) {
exec_stack_t *xstack = add_exec_stack_entry(s, NULL_REG, address, objp, argc, argp,
selector, objp, origin, SCI_XS_CALLEE_LOCALS);
/* Store selector address in sp */
xstack->addr.varp = address;
xstack->type = EXEC_STACK_TYPE_VARSELECTOR;
return xstack;
}
exec_stack_t *
add_exec_stack_entry(state_t *s, reg_t pc, stack_ptr_t sp, reg_t objp, int argc,
stack_ptr_t argp, selector_t selector, reg_t sendp, int origin,
seg_id_t locals_segment)
/* Returns new TOS element for the execution stack*/
/* locals_segment may be -1 if derived from the called object */
{
exec_stack_t *xstack = NULL;
if (!s->execution_stack)
s->execution_stack =
(exec_stack_t*)sci_malloc(sizeof(exec_stack_t) * (s->execution_stack_size = 16));
if (++(s->execution_stack_pos) == s->execution_stack_size) /* Out of stack space? */
s->execution_stack = (exec_stack_t*)sci_realloc(s->execution_stack,
sizeof(exec_stack_t) * (s->execution_stack_size += 8));
/* sciprintf("Exec stack: [%d/%d], origin %d, at %p\n", s->execution_stack_pos,
s->execution_stack_size, origin, s->execution_stack); */
xstack = s->execution_stack + s->execution_stack_pos;
xstack->objp = objp;
if (locals_segment != SCI_XS_CALLEE_LOCALS)
xstack->local_segment = locals_segment;
else
xstack->local_segment = pc.segment;
xstack->sendp = sendp;
xstack->addr.pc = pc;
xstack->fp = xstack->sp = sp;
xstack->argc = argc;
xstack->variables_argp = argp; /* Parameters */
*argp = make_reg(0, argc); /* SCI code relies on the zeroeth argument to equal argc */
/* Additional debug information */
xstack->selector = selector;
xstack->origin = origin;
xstack->type = EXEC_STACK_TYPE_CALL; /* Normal call */
return xstack;
}
#ifdef DISABLE_VALIDATONS
# define kernel_matches_signature(a, b, c, d) 1
#endif
void
vm_handle_fatal_error(state_t *s, int line, const char *file) {
error("Fatal VM error in %s, L%d; aborting...\n", file, line);
#ifdef HAVE_SETJMP_H
if (jump_initialized)
longjmp(vm_error_address, 0);
#endif
error("Could not recover, exitting...\n");
exit(1);
}
static inline script_t *
script_locate_by_segment(state_t *s, seg_id_t seg) {
mem_obj_t *memobj = GET_SEGMENT(s->seg_manager, seg, MEM_OBJ_SCRIPT);
if (memobj)
return &(memobj->data.script);
return NULL;
}
static reg_t
pointer_add(state_t *s, reg_t base, int offset) {
mem_obj_t *mobj = GET_SEGMENT_ANY(s->seg_manager, base.segment);
if (!mobj) {
script_debug_flag = script_error_flag = 1;
sciprintf("[VM] Error: Attempt to add %d to invalid pointer "PREG"!", offset, PRINT_REG(base));
return NULL_REG;
}
switch (mobj->type) {
case MEM_OBJ_LOCALS:
base.offset += 2 * offset;
return base;
case MEM_OBJ_SCRIPT:
case MEM_OBJ_STACK:
case MEM_OBJ_DYNMEM:
base.offset += offset;
return base;
break;
default:
sciprintf("[VM] Error: Attempt to add %d to pointer "PREG": Pointer arithmetics of this type unsupported!", offset, PRINT_REG(base));
return NULL_REG;
}
}
static inline void
gc_countdown(state_t *s) {
if (s->gc_countdown-- <= 0) {
s->gc_countdown = script_gc_interval;
run_gc(s);
}
}
static byte _fake_return_buffer[2] = {op_ret << 1, op_ret << 1};
void
run_vm(state_t *s, int restoring) {
reg_t *variables[4]; /* global, local, temp, param, as immediate pointers */
reg_t *variables_base[4]; /* Used for referencing VM ops */
seg_id_t variables_seg[4]; /* Same as above, contains segment IDs */
#ifndef DISABLE_VALIDATIONS
int variables_max[4]; /* Max. values for all variables */
unsigned int code_buf_size = 0 /* (Avoid spurious warning) */;
#endif
int temp;
gint16 aux_acc; /* Auxiliary 16 bit accumulator */
reg_t r_temp; /* Temporary register */
stack_ptr_t s_temp; /* Temporary stack pointer */
gint16 opparams[4]; /* opcode parameters */
int restadjust = s->r_amp_rest; /* &rest adjusts the parameter count
** by this value */
/* Current execution data: */
exec_stack_t *xs = s->execution_stack + s->execution_stack_pos;
exec_stack_t *xs_new = NULL /* (Avoid spurious warning) */; /* Used during some operations */
object_t *obj = obj_get(s, xs->objp);
script_t *local_script = script_locate_by_segment(s, xs->local_segment);
int old_execution_stack_base = s->execution_stack_base; /* Used to detect the
** stack bottom, for "physical"
** returns */
byte *code_buf = NULL /* (Avoid spurious warning) */;
if (!local_script) {
script_error(s, __FILE__, __LINE__, "Program Counter gone astray");
return;
}
if (NULL == s) {
sciprintf("vm.c: run_vm(): NULL passed for \"s\"\n");
return;
}
#ifdef HAVE_SETJMP_H
setjmp(vm_error_address);
jump_initialized = 1;
#endif
if (!restoring)
s->execution_stack_base = s->execution_stack_pos;
#ifndef DISABLE_VALIDATIONS
/* Initialize maximum variable count */
if (s->script_000->locals_block)
variables_max[VAR_GLOBAL] = s->script_000->locals_block->nr;
else
variables_max[VAR_GLOBAL] = 0;
#endif
variables_seg[VAR_GLOBAL] = s->script_000->locals_segment;
variables_seg[VAR_TEMP] = variables_seg[VAR_PARAM] = s->stack_segment;
variables_base[VAR_TEMP] = variables_base[VAR_PARAM] = s->stack_base;
/* SCI code reads the zeroeth argument to determine argc */
if (s->script_000->locals_block)
variables_base[VAR_GLOBAL] = variables[VAR_GLOBAL]
= s->script_000->locals_block->locals;
else
variables_base[VAR_GLOBAL] = variables[VAR_GLOBAL] = NULL;
s->execution_stack_pos_changed = 1; /* Force initialization */
while (1) {
byte opcode;
int old_pc_offset;
stack_ptr_t old_sp = xs->sp;
byte opnumber;
int var_type; /* See description below */
int var_number;
old_pc_offset = xs->addr.pc.offset;
if (s->execution_stack_pos_changed) {
script_t *scr;
xs = s->execution_stack + s->execution_stack_pos;
s->execution_stack_pos_changed = 0;
scr = script_locate_by_segment(s, xs->addr.pc.segment);
if (!scr) {
/* No script? Implicit return via fake instruction buffer */
warning("Running on non-existant script in segment %x", xs->addr.pc.segment);
code_buf = _fake_return_buffer;
#ifndef DISABLE_VALIDATIONS
code_buf_size = 2;
#endif
xs->addr.pc.offset = 1;
scr = NULL;
obj = NULL;
} else {
obj = obj_get(s, xs->objp);
code_buf = scr->buf;
#ifndef DISABLE_VALIDATIONS
code_buf_size = scr->buf_size;
#endif
/* if (!obj) {
SCIkdebug(SCIkWARNING, "Running with non-existant self= "PREG"\n", PRINT_REG(xs->objp));
}*/
local_script = script_locate_by_segment(s, xs->local_segment);
if (!local_script) {
warning("Could not find local script from segment %x", xs->local_segment);
local_script = NULL;
variables_base[VAR_LOCAL] = variables[VAR_LOCAL] = NULL;
#ifndef DISABLE_VALIDATIONS
variables_max[VAR_LOCAL] = 0;
#endif
} else {
variables_seg[VAR_LOCAL] = local_script->locals_segment;
if (local_script->locals_block)
variables_base[VAR_LOCAL] = variables[VAR_LOCAL]
= local_script->locals_block->locals;
else
variables_base[VAR_LOCAL] = variables[VAR_LOCAL]
= NULL;
#ifndef DISABLE_VALIDATIONS
if (local_script->locals_block)
variables_max[VAR_LOCAL] = local_script->locals_block->nr;
else
variables_max[VAR_LOCAL] = 0;
variables_max[VAR_TEMP] = xs->sp - xs->fp;
variables_max[VAR_PARAM] = xs->argc + 1;
#endif
}
variables[VAR_TEMP] = xs->fp;
variables[VAR_PARAM] = xs->variables_argp;
}
}
script_error_flag = 0; /* Set error condition to false */
if (script_abort_flag)
return; /* Emergency */
/* Debug if this has been requested: */
if (script_debug_flag || sci_debug_flags) {
script_debug(s, &(xs->addr.pc), &(xs->sp), &(xs->fp),
&(xs->objp), &restadjust,
variables_seg, variables, variables_base,
#ifdef DISABLE_VALIDATIONS
NULL,
#else
variables_max,
#endif
bp_flag);
bp_flag = 0;
}
#ifndef DISABLE_VALIDATIONS
if (xs->sp < xs->fp)
script_error(s, "[VM] "__FILE__, __LINE__, "Stack underflow");
variables_max[VAR_TEMP] = xs->sp - xs->fp;
if (xs->addr.pc.offset >= code_buf_size)
script_error(s, "[VM] "__FILE__, __LINE__, "Program Counter gone astray");
#endif
opcode = GET_OP_BYTE(); /* Get opcode */
opnumber = opcode >> 1;
for (temp = 0; formats[opnumber][temp]; temp++) /* formats comes from script.c */
switch (formats[opnumber][temp]) {
case Script_Byte:
opparams[temp] = GET_OP_BYTE();
break;
case Script_SByte:
opparams[temp] = GET_OP_SIGNED_BYTE();
break;
case Script_Word:
opparams[temp] = GET_OP_WORD();
break;
case Script_SWord:
opparams[temp] = GET_OP_SIGNED_WORD();
break;
case Script_Variable:
case Script_Property:
case Script_Local:
case Script_Temp:
case Script_Global:
case Script_Param:
opparams[temp] = GET_OP_FLEX();
break;
case Script_SVariable:
case Script_SRelative:
opparams[temp] = GET_OP_SIGNED_FLEX();
break;
case Script_Offset:
opparams[temp] = GET_OP_FLEX();
break;
case Script_None:
case Script_End:
break;
case Script_Invalid:
default:
sciprintf("opcode %02x: Invalid!", opcode);
script_debug_flag = script_error_flag = 1;
}
// TODO: Replace the following by an opcode table, and several methods for
// each opcode.
switch (opnumber) {
case 0x00: /* bnot */
s->r_acc = ACC_ARITHMETIC_L(0xffff ^ /*acc*/);
break;
case 0x01: /* add */
r_temp = POP32();
if (r_temp.segment || s->r_acc.segment) {
reg_t r_ptr;
int offset;
/* Pointer arithmetics! */
if (s->r_acc.segment) {
if (r_temp.segment) {
sciprintf("Error: Attempt to add two pointers, stack="PREG" and acc="PREG"",
PRINT_REG(r_temp), PRINT_REG(s->r_acc));
script_debug_flag = script_error_flag = 1;
offset = 0;
} else {
r_ptr = s->r_acc;
offset = r_temp.offset;
}
} else {
r_ptr = r_temp;
offset = s->r_acc.offset;
}
s->r_acc = pointer_add(s, r_ptr, offset);
} else
s->r_acc = make_reg(0, r_temp.offset + s->r_acc.offset);
break;
case 0x02: /* sub */
r_temp = POP32();
if (r_temp.segment || s->r_acc.segment) {
reg_t r_ptr;
int offset;
/* Pointer arithmetics! */
if (s->r_acc.segment) {
if (r_temp.segment) {
sciprintf("Error: Attempt to subtract two pointers, stack="PREG" and acc="PREG"",
PRINT_REG(r_temp), PRINT_REG(s->r_acc));
script_debug_flag = script_error_flag = 1;
offset = 0;
} else {
r_ptr = s->r_acc;
offset = r_temp.offset;
}
} else {
r_ptr = r_temp;
offset = s->r_acc.offset;
}
s->r_acc = pointer_add(s, r_ptr, -offset);
} else
s->r_acc = make_reg(0, r_temp.offset - s->r_acc.offset);
break;
case 0x03: /* mul */
s->r_acc = ACC_ARITHMETIC_L(((gint16)POP()) * (gint16)/*acc*/);
break;
case 0x04: /* div */
ACC_AUX_LOAD();
aux_acc = aux_acc != 0 ? ((gint16)POP()) / aux_acc : 0;
ACC_AUX_STORE();
break;
case 0x05: /* mod */
ACC_AUX_LOAD();
aux_acc = aux_acc != 0 ? ((gint16)POP()) % aux_acc : 0;
ACC_AUX_STORE();
break;
case 0x06: /* shr */
s->r_acc = ACC_ARITHMETIC_L(((guint16) POP()) >> /*acc*/);
break;
case 0x07: /* shl */
s->r_acc = ACC_ARITHMETIC_L(((guint16) POP()) << /*acc*/);
break;
case 0x08: /* xor */
s->r_acc = ACC_ARITHMETIC_L(POP() ^ /*acc*/);
break;
case 0x09: /* and */
s->r_acc = ACC_ARITHMETIC_L(POP() & /*acc*/);
break;
case 0x0a: /* or */
s->r_acc = ACC_ARITHMETIC_L(POP() | /*acc*/);
break;
case 0x0b: /* neg */
s->r_acc = ACC_ARITHMETIC_L(-/*acc*/);
break;
case 0x0c: /* not */
s->r_acc = make_reg(0, !(s->r_acc.offset || s->r_acc.segment));
/* Must allow pointers to be negated, as this is used for
** checking whether objects exist */
break;
case 0x0d: /* eq? */
s->r_prev = s->r_acc;
r_temp = POP32();
s->r_acc = make_reg(0, REG_EQ(r_temp, s->r_acc));
/* Explicitly allow pointers to be compared */
break;
case 0x0e: /* ne? */
s->r_prev = s->r_acc;
r_temp = POP32();
s->r_acc = make_reg(0, !REG_EQ(r_temp, s->r_acc));
/* Explicitly allow pointers to be compared */
break;
case 0x0f: /* gt? */
s->r_prev = s->r_acc;
s->r_acc = ACC_ARITHMETIC_L((gint16)POP() > (gint16)/*acc*/);
break;
case 0x10: /* ge? */
s->r_prev = s->r_acc;
s->r_acc = ACC_ARITHMETIC_L((gint16)POP() >= (gint16)/*acc*/);
break;
case 0x11: /* lt? */
s->r_prev = s->r_acc;
s->r_acc = ACC_ARITHMETIC_L((gint16)POP() < (gint16)/*acc*/);
break;
case 0x12: /* le? */
s->r_prev = s->r_acc;
s->r_acc = ACC_ARITHMETIC_L((gint16)POP() <= (gint16)/*acc*/);
break;
case 0x13: /* ugt? */
s->r_prev = s->r_acc;
r_temp = POP32();
s->r_acc = make_reg(0, (r_temp.segment == s->r_acc.segment) && r_temp.offset > s->r_acc.offset);
break;
case 0x14: /* uge? */
s->r_prev = s->r_acc;
r_temp = POP32();
s->r_acc = make_reg(0, (r_temp.segment == s->r_acc.segment) && r_temp.offset >= s->r_acc.offset);
break;
case 0x15: /* ult? */
s->r_prev = s->r_acc;
r_temp = POP32();
s->r_acc = make_reg(0, (r_temp.segment == s->r_acc.segment) && r_temp.offset < s->r_acc.offset);
break;
case 0x16: /* ule? */
s->r_prev = s->r_acc;
r_temp = POP32();
s->r_acc = make_reg(0, (r_temp.segment == s->r_acc.segment) && r_temp.offset <= s->r_acc.offset);
break;
case 0x17: /* bt */
if (s->r_acc.offset || s->r_acc.segment)
xs->addr.pc.offset += opparams[0];
break;
case 0x18: /* bnt */
if (!(s->r_acc.offset || s->r_acc.segment))
xs->addr.pc.offset += opparams[0];
break;
case 0x19: /* jmp */
xs->addr.pc.offset += opparams[0];
break;
case 0x1a: /* ldi */
s->r_acc = make_reg(0, opparams[0]);
break;
case 0x1b: /* push */
PUSH32(s->r_acc);
break;
case 0x1c: /* pushi */
PUSH(opparams[0]);
break;
case 0x1d: /* toss */
xs->sp--;
break;
case 0x1e: /* dup */
r_temp = xs->sp[-1];
PUSH32(r_temp);
break;
case 0x1f: { /* link */
int i;
for (i = 0; i < opparams[0]; i++)
xs->sp[i] = NULL_REG;
xs->sp += opparams[0];
break;
}
case 0x20: { /* call */
int argc = (opparams[1] >> 1) /* Given as offset, but we need count */
+ 1 + restadjust;
stack_ptr_t call_base = xs->sp - argc;
xs->sp[1].offset += restadjust;
xs_new = add_exec_stack_entry(s, make_reg(xs->addr.pc.segment,
xs->addr.pc.offset
+ opparams[0]),
xs->sp, xs->objp,
(validate_arithmetic(*call_base))
+ restadjust,
call_base, NULL_SELECTOR, xs->objp,
s->execution_stack_pos, xs->local_segment);
restadjust = 0; /* Used up the &rest adjustment */
xs->sp = call_base;
s->execution_stack_pos_changed = 1;
break;
}
case 0x21: /* callk */
gc_countdown(s);
xs->sp -= (opparams[1] >> 1) + 1;
if (s->version >= SCI_VERSION_FTU_NEW_SCRIPT_HEADER) {
xs->sp -= restadjust;
s->r_amp_rest = 0; /* We just used up the restadjust, remember? */
}
if (opparams[0] >= s->kfunct_nr) {
sciprintf("Invalid kernel function 0x%x requested\n", opparams[0]);
script_debug_flag = script_error_flag = 1;
} else {
int argc = ASSERT_ARITHMETIC(xs->sp[0]);
if (s->version >= SCI_VERSION_FTU_NEW_SCRIPT_HEADER)
argc += restadjust;
if (s->kfunct_table[opparams[0]].signature
&& !kernel_matches_signature(s,
s->kfunct_table[opparams[0]]
.signature,
argc, xs->sp + 1)) {
sciprintf("[VM] Invalid arguments to kernel call %x\n",
opparams[0]);
script_debug_flag = script_error_flag = 1;
} else {
s->r_acc = s->kfunct_table[opparams[0]]
.fun(s, opparams[0], argc, xs->sp + 1);
}
/* Call kernel function */
/* Calculate xs again: The kernel function might
** have spawned a new VM */
xs_new = s->execution_stack + s->execution_stack_pos;
s->execution_stack_pos_changed = 1;
if (s->version >= SCI_VERSION_FTU_NEW_SCRIPT_HEADER)
restadjust = s->r_amp_rest;
}
break;
case 0x22: /* callb */
temp = ((opparams[1] >> 1) + restadjust + 1);
s_temp = xs->sp;
xs->sp -= temp;
xs->sp[0].offset += restadjust;
xs_new = execute_method(s, 0, opparams[0], s_temp, xs->objp,
xs->sp[0].offset, xs->sp);
restadjust = 0; /* Used up the &rest adjustment */
if (xs_new) /* in case of error, keep old stack */
s->execution_stack_pos_changed = 1;
break;
case 0x23: /* calle */
temp = ((opparams[2] >> 1) + restadjust + 1);
s_temp = xs->sp;
xs->sp -= temp;
xs->sp[0].offset += restadjust;
xs_new = execute_method(s, opparams[0], opparams[1], s_temp, xs->objp,
xs->sp[0].offset, xs->sp);
restadjust = 0; /* Used up the &rest adjustment */
if (xs_new) /* in case of error, keep old stack */
s->execution_stack_pos_changed = 1;
break;
case 0x24: /* ret */
do {
stack_ptr_t old_sp = xs->sp;
stack_ptr_t old_fp = xs->fp;
exec_stack_t *old_xs = s->execution_stack + s->execution_stack_pos;
if (s->execution_stack_pos == s->execution_stack_base) { /* Have we reached the base? */
s->execution_stack_base = old_execution_stack_base; /* Restore stack base */
--(s->execution_stack_pos);
s->execution_stack_pos_changed = 1;
s->r_amp_rest = restadjust; /* Update &rest */
return; /* "Hard" return */
}
if (old_xs->type == EXEC_STACK_TYPE_VARSELECTOR) {
/* varselector access? */
if (old_xs->argc) /* write? */
*(old_xs->addr.varp) = old_xs->variables_argp[1];
else /* No, read */
s->r_acc = *(old_xs->addr.varp);
}
/* Not reached the base, so let's do a soft return */
--(s->execution_stack_pos);
xs = old_xs - 1;
s->execution_stack_pos_changed = 1;
xs = s->execution_stack + s->execution_stack_pos;
if (xs->sp == CALL_SP_CARRY /* Used in sends to 'carry' the stack pointer */
|| xs->type != EXEC_STACK_TYPE_CALL) {
xs->sp = old_sp;
xs->fp = old_fp;
}
} while (xs->type == EXEC_STACK_TYPE_VARSELECTOR);
/* Iterate over all varselector accesses */
s->execution_stack_pos_changed = 1;
xs_new = xs;
break;
case 0x25: /* send */
s_temp = xs->sp;
xs->sp -= ((opparams[0] >> 1) + restadjust); /* Adjust stack */
xs->sp[1].offset += restadjust;
xs_new = send_selector(s, s->r_acc, s->r_acc, s_temp,
(int)(opparams[0] >> 1) + (word)restadjust,
xs->sp);
if (xs_new && xs_new != xs)
s->execution_stack_pos_changed = 1;
restadjust = 0;
break;
case 0x28: /* class */
s->r_acc = get_class_address(s, (unsigned) opparams[0], SCRIPT_GET_LOCK, xs->addr.pc);
break;
case 0x2a: /* self */
s_temp = xs->sp;
xs->sp -= ((opparams[0] >> 1) + restadjust); /* Adjust stack */
xs->sp[1].offset += restadjust;
xs_new = send_selector(s, xs->objp, xs->objp, s_temp,
(int)(opparams[0] >> 1) + (word)restadjust,
xs->sp);
if (xs_new && xs_new != xs)
s->execution_stack_pos_changed = 1;
restadjust = 0;
break;
case 0x2b: /* super */
r_temp = get_class_address(s, opparams[0], SCRIPT_GET_LOAD, xs->addr.pc);
if (!r_temp.segment)
CORE_ERROR("VM", "Invalid superclass in object");
else {
s_temp = xs->sp;
xs->sp -= ((opparams[1] >> 1) + restadjust); /* Adjust stack */
xs->sp[1].offset += restadjust;
xs_new = send_selector(s, r_temp, xs->objp, s_temp,
(int)(opparams[1] >> 1) + (word)restadjust,
xs->sp);
if (xs_new && xs_new != xs)
s->execution_stack_pos_changed = 1;
restadjust = 0;
}
break;
case 0x2c: /* &rest */
temp = (guint16) opparams[0]; /* First argument */
restadjust = xs->argc - temp + 1; /* +1 because temp counts the paramcount while argc doesn't */
if (restadjust < 0)
restadjust = 0;
for (; temp <= xs->argc; temp++)
PUSH32(xs->variables_argp[temp]);
break;
case 0x2d: /* lea */
temp = (guint16) opparams[0] >> 1;
var_number = temp & 0x03; /* Get variable type */
/* Get variable block offset */
r_temp.segment = variables_seg[var_number];
r_temp.offset = variables[var_number] - variables_base[var_number];
if (temp & 0x08) /* Add accumulator offset if requested */
r_temp.offset += signed_validate_arithmetic(s->r_acc);
r_temp.offset += opparams[1]; /* Add index */
r_temp.offset *= sizeof(reg_t);
/* That's the immediate address now */
s->r_acc = r_temp;
break;
case 0x2e: /* selfID */
s->r_acc = xs->objp;
break;
case 0x30: /* pprev */
PUSH32(s->r_prev);
break;
case 0x31: /* pToa */
s->r_acc = OBJ_PROPERTY(obj, (opparams[0] >> 1));
break;
case 0x32: /* aTop */
OBJ_PROPERTY(obj, (opparams[0] >> 1)) = s->r_acc;
break;
case 0x33: /* pTos */
PUSH32(OBJ_PROPERTY(obj, opparams[0] >> 1));
break;
case 0x34: /* sTop */
OBJ_PROPERTY(obj, (opparams[0] >> 1)) = POP32();
break;
case 0x35: /* ipToa */
s->r_acc = OBJ_PROPERTY(obj, (opparams[0] >> 1));
s->r_acc = OBJ_PROPERTY(obj, (opparams[0] >> 1)) =
ACC_ARITHMETIC_L(1 + /*acc*/);
break;
case 0x36: /* dpToa */
s->r_acc = OBJ_PROPERTY(obj, (opparams[0] >> 1));
s->r_acc = OBJ_PROPERTY(obj, (opparams[0] >> 1)) =
ACC_ARITHMETIC_L(-1 + /*acc*/);
break;
case 0x37: /* ipTos */
ASSERT_ARITHMETIC(OBJ_PROPERTY(obj, (opparams[0] >> 1)));
temp = ++OBJ_PROPERTY(obj, (opparams[0] >> 1)).offset;
PUSH(temp);
break;
case 0x38: /* dpTos */
ASSERT_ARITHMETIC(OBJ_PROPERTY(obj, (opparams[0] >> 1)));
temp = --OBJ_PROPERTY(obj, (opparams[0] >> 1)).offset;
PUSH(temp);
break;
case 0x39: /* lofsa */
s->r_acc.segment = xs->addr.pc.segment;
if (s->version >= SCI_VERSION(1, 001, 000))
s->r_acc.offset = opparams[0] + local_script->script_size;
else
if (s->version >= SCI_VERSION_FTU_LOFS_ABSOLUTE)
s->r_acc.offset = opparams[0];
else
s->r_acc.offset = xs->addr.pc.offset + opparams[0];
#ifndef DISABLE_VALIDATIONS
if (s->r_acc.offset >= code_buf_size) {
sciprintf("VM: lofsa operation overflowed: "PREG" beyond end"
" of script (at %04x)\n", PRINT_REG(s->r_acc),
code_buf_size);
script_error_flag = script_debug_flag = 1;
}
#endif
break;
case 0x3a: /* lofss */
r_temp.segment = xs->addr.pc.segment;
if (s->version >= SCI_VERSION_FTU_LOFS_ABSOLUTE)
r_temp.offset = opparams[0];
else
r_temp.offset = xs->addr.pc.offset + opparams[0];
#ifndef DISABLE_VALIDATIONS
if (r_temp.offset >= code_buf_size) {
sciprintf("VM: lofss operation overflowed: "PREG" beyond end"
" of script (at %04x)\n", PRINT_REG(r_temp),
code_buf_size);
script_error_flag = script_debug_flag = 1;
}
#endif
PUSH32(r_temp);
break;
case 0x3b: /* push0 */
PUSH(0);
break;
case 0x3c: /* push1 */
PUSH(1);
break;
case 0x3d: /* push2 */
PUSH(2);
break;
case 0x3e: /* pushSelf */
PUSH32(xs->objp);
break;
case 0x40: /* lag */
case 0x41: /* lal */
case 0x42: /* lat */
case 0x43: /* lap */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0];
s->r_acc = READ_VAR(var_type, var_number, s->r_acc);
break;
case 0x44: /* lsg */
case 0x45: /* lsl */
case 0x46: /* lst */
case 0x47: /* lsp */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0];
PUSH32(READ_VAR(var_type, var_number, s->r_acc));
break;
case 0x48: /* lagi */
case 0x49: /* lali */
case 0x4a: /* lati */
case 0x4b: /* lapi */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0] + signed_validate_arithmetic(s->r_acc);
s->r_acc = READ_VAR(var_type, var_number, s->r_acc);
break;
case 0x4c: /* lsgi */
case 0x4d: /* lsli */
case 0x4e: /* lsti */
case 0x4f: /* lspi */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0] + signed_validate_arithmetic(s->r_acc);
PUSH32(READ_VAR(var_type, var_number, s->r_acc));
break;
case 0x50: /* sag */
case 0x51: /* sal */
case 0x52: /* sat */
case 0x53: /* sap */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0];
WRITE_VAR(var_type, var_number, s->r_acc);
break;
case 0x54: /* ssg */
case 0x55: /* ssl */
case 0x56: /* sst */
case 0x57: /* ssp */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0];
WRITE_VAR(var_type, var_number, POP32());
break;
case 0x58: /* sagi */
case 0x59: /* sali */
case 0x5a: /* sati */
case 0x5b: /* sapi */
/* Special semantics because it wouldn't really make a whole lot
** of sense otherwise, with acc being used for two things
** simultaneously... */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0] + signed_validate_arithmetic(s->r_acc);
WRITE_VAR(var_type, var_number, s->r_acc = POP32());
break;
case 0x5c: /* ssgi */
case 0x5d: /* ssli */
case 0x5e: /* ssti */
case 0x5f: /* sspi */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0] + signed_validate_arithmetic(s->r_acc);
WRITE_VAR(var_type, var_number, POP32());
break;
case 0x60: /* +ag */
case 0x61: /* +al */
case 0x62: /* +at */
case 0x63: /* +ap */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0];
s->r_acc = make_reg(0,
1 + validate_arithmetic(READ_VAR(var_type,
var_number,
s->r_acc)));
WRITE_VAR(var_type, var_number, s->r_acc);
break;
case 0x64: /* +sg */
case 0x65: /* +sl */
case 0x66: /* +st */
case 0x67: /* +sp */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0];
r_temp = make_reg(0,
1 + validate_arithmetic(READ_VAR(var_type,
var_number,
s->r_acc)));
PUSH32(r_temp);
WRITE_VAR(var_type, var_number, r_temp);
break;
case 0x68: /* +agi */
case 0x69: /* +ali */
case 0x6a: /* +ati */
case 0x6b: /* +api */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0] + signed_validate_arithmetic(s->r_acc);
s->r_acc = make_reg(0,
1 + validate_arithmetic(READ_VAR(var_type,
var_number,
s->r_acc)));
WRITE_VAR(var_type, var_number, s->r_acc);
break;
case 0x6c: /* +sgi */
case 0x6d: /* +sli */
case 0x6e: /* +sti */
case 0x6f: /* +spi */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0] + signed_validate_arithmetic(s->r_acc);
r_temp = make_reg(0,
1 + validate_arithmetic(READ_VAR(var_type,
var_number,
s->r_acc)));
PUSH32(r_temp);
WRITE_VAR(var_type, var_number, r_temp);
break;
case 0x70: /* -ag */
case 0x71: /* -al */
case 0x72: /* -at */
case 0x73: /* -ap */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0];
s->r_acc = make_reg(0,
-1 + validate_arithmetic(READ_VAR(var_type,
var_number, s->r_acc)));
WRITE_VAR(var_type, var_number, s->r_acc);
break;
case 0x74: /* -sg */
case 0x75: /* -sl */
case 0x76: /* -st */
case 0x77: /* -sp */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0];
r_temp = make_reg(0,
-1 + validate_arithmetic(READ_VAR(var_type,
var_number, s->r_acc)));
PUSH32(r_temp);
WRITE_VAR(var_type, var_number, r_temp);
break;
case 0x78: /* -agi */
case 0x79: /* -ali */
case 0x7a: /* -ati */
case 0x7b: /* -api */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0] + signed_validate_arithmetic(s->r_acc);
s->r_acc = make_reg(0,
-1 + validate_arithmetic(READ_VAR(var_type,
var_number,
s->r_acc)));
WRITE_VAR(var_type, var_number, s->r_acc);
break;
case 0x7c: /* -sgi */
case 0x7d: /* -sli */
case 0x7e: /* -sti */
case 0x7f: /* -spi */
var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */
var_number = opparams[0] + signed_validate_arithmetic(s->r_acc);
r_temp = make_reg(0,
-1 + validate_arithmetic(READ_VAR(var_type,
var_number,
s->r_acc)));
PUSH32(r_temp);
WRITE_VAR(var_type, var_number, r_temp);
break;
default:
script_error(s, __FILE__, __LINE__, "Illegal opcode");
} /* switch(opcode >> 1) */
if (s->execution_stack_pos_changed) /* Force initialization */
xs = xs_new;
#ifndef DISABLE_VALIDATIONS
if (xs != s->execution_stack + s->execution_stack_pos) {
sciprintf("Error: xs is stale (%d vs %d); last command was %02x\n",
xs - s->execution_stack, s->execution_stack_pos, opnumber);
}
#endif
if (script_error_flag) {
_debug_step_running = 0; /* Stop multiple execution */
_debug_seeking = 0; /* Stop special seeks */
xs->addr.pc.offset = old_pc_offset;
xs->sp = old_sp;
} else
++script_step_counter;
}
}
static inline int
_obj_locate_varselector(state_t *s, object_t *obj, selector_t slc) { /* Determines if obj explicitly defines slc as a varselector */
/* Returns -1 if not found */
if (s->version < SCI_VERSION(1, 001, 000)) {
int varnum = obj->variable_names_nr;
int selector_name_offset = varnum * 2 + SCRIPT_SELECTOR_OFFSET;
int i;
byte *buf = obj->base_obj + selector_name_offset;
obj->base_vars = (guint16 *) buf;
for (i = 0; i < varnum; i++)
if (getUInt16(buf + (i << 1)) == slc) /* Found it? */
return i; /* report success */
return -1; /* Failed */
} else {
byte *buf = (byte *) obj->base_vars;
int i;
int varnum = obj->variables[1].offset;
if (!(obj->variables[SCRIPT_INFO_SELECTOR].offset & SCRIPT_INFO_CLASS))
buf = ((byte *) obj_get(s, obj->variables[SCRIPT_SUPERCLASS_SELECTOR])->base_vars);
for (i = 0; i < varnum; i++)
if (getUInt16(buf + (i << 1)) == slc) /* Found it? */
return i; /* report success */
return -1; /* Failed */
}
}
static inline int
_class_locate_funcselector(state_t *s, object_t *obj, selector_t slc) { /* Determines if obj is a class and explicitly defines slc as a funcselector */
/* Does NOT say anything about obj's superclasses, i.e. failure may be
** returned even if one of the superclasses defines the funcselector. */
int funcnum = obj->methods_nr;
int i;
for (i = 0; i < funcnum; i++)
if (VM_OBJECT_GET_FUNCSELECTOR(obj, i) == slc) /* Found it? */
return i; /* report success */
return -1; /* Failed */
}
static inline int
_lookup_selector_function(state_t *s, int seg_id, object_t *obj, selector_t selector_id, reg_t *fptr) {
int index;
/* "recursive" lookup */
while (obj) {
index = _class_locate_funcselector(s, obj, selector_id);
if (index >= 0) {
if (fptr) {
if (s->version < SCI_VERSION(1, 001, 000))
*fptr = make_reg(obj->pos.segment,
getUInt16((byte *)
(obj->base_method + index
+ obj->methods_nr + 1)));
else
*fptr = make_reg(obj->pos.segment,
getUInt16((byte *)
(obj->base_method + index * 2 + 2)));
}
return SELECTOR_METHOD;
} else {
seg_id = obj->variables[SCRIPT_SUPERCLASS_SELECTOR].segment;
obj = obj_get(s, obj->variables[SCRIPT_SUPERCLASS_SELECTOR]);
}
}
return SELECTOR_NONE;
}
int
lookup_selector(state_t *s, reg_t obj_location, selector_t selector_id, reg_t **vptr, reg_t *fptr) {
object_t *obj = obj_get(s, obj_location);
object_t *species;
int index;
/* Early SCI versions used the LSB in the selector ID as a read/write
** toggle, meaning that we must remove it for selector lookup. */
if (s->version < SCI_VERSION_FTU_NEW_SCRIPT_HEADER)
selector_id &= ~1;
if (!obj) {
CORE_ERROR("SLC-LU", "Attempt to send to non-object or invalid script");
sciprintf("Address was "PREG"\n", PRINT_REG(obj_location));
return SELECTOR_NONE;
}
if (IS_CLASS(obj))
species = obj;
else
species = obj_get(s, obj->variables[SCRIPT_SPECIES_SELECTOR]);
if (!obj) {
CORE_ERROR("SLC-LU", "Error while looking up Species class");
sciprintf("Original address was "PREG"\n", PRINT_REG(obj_location));
sciprintf("Species address was "PREG"\n", PRINT_REG(obj->variables[SCRIPT_SPECIES_SELECTOR]));
return SELECTOR_NONE;
}
index = _obj_locate_varselector(s, obj, selector_id);
if (index >= 0) {
/* Found it as a variable */
if (vptr)
*vptr = obj->variables + index;
return SELECTOR_VARIABLE;
}
return
_lookup_selector_function(s, obj_location.segment, obj, selector_id, fptr);
}
/* Detects SCI versions by their different script header */
void script_detect_versions(state_t *s) {
int c;
resource_t *script = {0};
if (scir_find_resource(s->resmgr, sci_heap, 0, 0)) {
version_require_later_than(s, SCI_VERSION(1, 001, 000));
return;
}
for (c = 0; c < 1000; c++) {
if ((script = scir_find_resource(s->resmgr, sci_script, c, 0))) {
int id = getInt16(script->data);
if (id > 15) {
version_require_earlier_than(s, SCI_VERSION_FTU_NEW_SCRIPT_HEADER);
return;
}
}
}
}
seg_id_t
script_get_segment(state_t *s, int script_nr, int load) {
seg_id_t segment;
if ((load & SCRIPT_GET_LOAD) == SCRIPT_GET_LOAD)
script_instantiate(s, script_nr);
segment = sm_seg_get(&s->seg_manager, script_nr);
if (segment > 0) {
if ((load & SCRIPT_GET_LOCK) == SCRIPT_GET_LOCK)
sm_increment_lockers(&s->seg_manager, segment, SEG_ID);
return segment;
} else
return 0;
}
reg_t
script_lookup_export(state_t *s, int script_nr, int export_index) {
seg_id_t seg = script_get_segment(s, script_nr, SCRIPT_GET_DONT_LOAD);
mem_obj_t *memobj;
script_t *script = NULL;
#ifndef DISABLE_VALIDATIONS
if (!seg) {
CORE_ERROR("EXPORTS", "Script invalid or not loaded");
sciprintf("Script was script.03d (0x%x)\n",
script_nr, script_nr);
return NULL_REG;
}
#endif
memobj = GET_SEGMENT(s->seg_manager, seg, MEM_OBJ_SCRIPT);
if (memobj)
script = &(memobj->data.script);
#ifndef DISABLE_VALIDATIONS
if (script
&& export_index < script->exports_nr
&& export_index >= 0)
#endif
return make_reg(seg, getUInt16((byte *)(script->export_table + export_index)));
#ifndef DISABLE_VALIDATIONS
else {
CORE_ERROR("EXPORTS", "Export invalid or script missing ");
if (!script)
sciprintf("(script.%03d missing)\n", script_nr);
else
sciprintf("(script.%03d: Sought export %d/%d)\n",
script_nr, export_index, script->exports_nr);
return NULL_REG;
}
#endif
}
#define INST_LOOKUP_CLASS(id) ((id == 0xffff)? NULL_REG : get_class_address(s, id, SCRIPT_GET_LOCK, reg))
int sm_script_marked_deleted(seg_manager_t* self, int script_nr);
int sm_initialise_script(mem_obj_t *mem, struct _state *s, int script_nr);
int
script_instantiate_common(state_t *s, int script_nr, resource_t **script, resource_t **heap, int *was_new) {
int seg;
int seg_id;
int marked_for_deletion;
mem_obj_t *mem;
reg_t reg;
*was_new = 1;
*script = scir_find_resource(s->resmgr, sci_script, script_nr, 0);
if (s->version >= SCI_VERSION(1, 001, 000))
*heap = scir_find_resource(s->resmgr, sci_heap, script_nr, 0);
if (!*script || (s->version >= SCI_VERSION(1, 001, 000) && !heap)) {
sciprintf("Script 0x%x requested but not found\n", script_nr);
/* script_debug_flag = script_error_flag = 1; */
if (s->version >= SCI_VERSION(1, 001, 000)) {
if (*heap)
sciprintf("Inconsistency: heap resource WAS found\n");
else if (*script)
sciprintf("Inconsistency: script resource WAS found\n");
}
return 0;
}
if (NULL == s) {
sciprintf("vm.c: script_instantiate(): NULL passed for \"s\"\n");
return 0;
}
seg = sm_seg_get(&s->seg_manager, script_nr);
if (sm_script_is_loaded(&s->seg_manager, script_nr, SCRIPT_ID)) {
marked_for_deletion = sm_script_marked_deleted(&s->seg_manager, script_nr);
if (!marked_for_deletion) {
sm_increment_lockers(&s->seg_manager, seg, SEG_ID);
return seg;
} else {
seg_id = seg;
mem = s->seg_manager.heap[seg];
sm_free_script(mem);
}
} else if (!(mem = sm_allocate_script(&s->seg_manager, s, script_nr, &seg_id))) { /* ALL YOUR SCRIPT BASE ARE BELONG TO US */
sciprintf("Not enough heap space for script size 0x%x of script 0x%x,"
" should this happen?`\n",
(*script)->size, script_nr);
script_debug_flag = script_error_flag = 1;
return 0;
}
sm_initialise_script(mem, s, script_nr);
reg.segment = seg_id;
reg.offset = 0;
/* Set heap position (beyond the size word) */
sm_set_lockers(&s->seg_manager, 1, reg.segment, SEG_ID);
sm_set_export_table_offset(&s->seg_manager, 0, reg.segment, SEG_ID);
sm_set_synonyms_offset(&s->seg_manager, 0, reg.segment, SEG_ID);
sm_set_synonyms_nr(&s->seg_manager, 0, reg.segment, SEG_ID);
*was_new = 0;
return seg_id;
}
int
script_instantiate_sci0(state_t *s, int script_nr) {
int objtype;
unsigned int objlength;
reg_t reg, reg_tmp;
int seg_id;
int relocation = -1;
int magic_pos_adder; /* Usually 0; 2 for older SCI versions */
resource_t *script;
int was_new;
seg_id = script_instantiate_common(s, script_nr, &script, NULL, &was_new);
if (was_new) return seg_id;
reg.segment = seg_id;
reg.offset = 0;
if (s->version < SCI_VERSION_FTU_NEW_SCRIPT_HEADER) {
/*
int locals_size = getUInt16(script->data)*2;
int locals = (locals_size)? script->size : 0;
*/
int locals_nr = getUInt16(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. */
sm_mcpy_in_out(&s->seg_manager, 0, script->data, script->size, reg.segment, SEG_ID);
magic_pos_adder = 2; /* Step over the funny prefix */
if (locals_nr)
sm_script_initialise_locals_zero(&s->seg_manager,
reg.segment, locals_nr);
} else {
sm_mcpy_in_out(&s->seg_manager, 0, script->data, script->size, reg.segment, SEG_ID);
magic_pos_adder = 0;
}
/* Now do a first pass through the script objects to find the
** export table and local variable block
*/
objlength = 0;
reg_tmp = reg;
reg.offset = magic_pos_adder;
do {
reg_t data_base;
reg_t addr;
reg.offset += objlength; /* Step over the last checked object */
objtype = SEG_GET_HEAP(s, reg);
if (!objtype) break;
objlength = SEG_GET_HEAP(s, make_reg(reg.segment, reg.offset + 2));
data_base = reg;
data_base.offset += 4;
addr = data_base;
switch (objtype) {
case sci_obj_exports: {
sm_set_export_table_offset(&s->seg_manager, data_base.offset,
reg.segment, SEG_ID);
}
break;
case sci_obj_synonyms:
sm_set_synonyms_offset(&s->seg_manager, addr.offset, reg.segment, SEG_ID); /* +4 is to step over the header */
sm_set_synonyms_nr(&s->seg_manager, (objlength) / 4, reg.segment, SEG_ID);
break;
case sci_obj_localvars:
sm_script_initialise_locals(&s->seg_manager, data_base);
break;
case sci_obj_class: {
int classpos = addr.offset - SCRIPT_OBJECT_MAGIC_OFFSET;
int species;
reg_tmp.offset = addr.offset - SCRIPT_OBJECT_MAGIC_OFFSET;
species = OBJ_SPECIES(s, reg_tmp);
if (species < 0 || species >= s->classtable_size) {
sciprintf("Invalid species %d(0x%x) not in interval "
"[0,%d) while instantiating script %d\n",
species, species, s->classtable_size,
script_nr);
script_debug_flag = script_error_flag = 1;
return 1;
}
s->classtable[species].script = script_nr;
s->classtable[species].reg = addr;
s->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 = SEG_GET_HEAP(s, reg);
if (!objtype) break;
objlength = SEG_GET_HEAP(s, make_reg(reg.segment, reg.offset + 2));
reg.offset += 4; /* Step over header */
addr = reg;
switch (objtype) {
case sci_obj_code:
sm_script_add_code_block(&s->seg_manager, addr);
break;
case sci_obj_object:
case sci_obj_class: { /* object or class? */
object_t *obj = sm_script_obj_init(&s->seg_manager, s, addr);
object_t *base_obj;
/* Instantiate the superclass, if neccessary */
obj->variables[SCRIPT_SPECIES_SELECTOR] =
INST_LOOKUP_CLASS(obj->variables[SCRIPT_SPECIES_SELECTOR].offset);
base_obj = obj_get(s, obj->variables[SCRIPT_SPECIES_SELECTOR]);
obj->variable_names_nr = base_obj->variables_nr;
obj->base_obj = base_obj->base_obj;
/* 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);
} /* if object or class */
break;
case sci_obj_pointers: /* A relocation table */
relocation = addr.offset;
break;
default:
break;
}
reg.offset -= 4; /* Step back on header */
} while ((objtype != 0) && (((unsigned)reg.offset) < script->size - 2));
if (relocation >= 0)
sm_script_relocate(&s->seg_manager, make_reg(reg.segment, relocation));
sm_script_free_unused_objects(&s->seg_manager, reg.segment);
return reg.segment; /* instantiation successful */
}
void
sm_script_relocate_exports_sci11(seg_manager_t *self, int seg);
void
sm_script_initialise_objects_sci11(seg_manager_t *self, state_t *s, int seg);
void
sm_heap_relocate(seg_manager_t *self, state_t *s, reg_t block);
int
script_instantiate_sci11(state_t *s, int script_nr) {
resource_t *script, *heap;
int seg_id;
int heap_start;
reg_t reg;
int was_new;
seg_id = script_instantiate_common(s, script_nr, &script, &heap, &was_new);
if (was_new) return seg_id;
heap_start = script->size;
if (script->size & 2)
heap_start ++;
sm_mcpy_in_out(&s->seg_manager, 0, script->data, script->size, seg_id, SEG_ID);
sm_mcpy_in_out(&s->seg_manager, heap_start, heap->data, heap->size, seg_id, SEG_ID);
if (getUInt16(script->data + 6) > 0)
sm_set_export_table_offset(&s->seg_manager, 6,
seg_id, SEG_ID);
reg.segment = seg_id;
reg.offset = heap_start + 4;
sm_script_initialise_locals(&s->seg_manager, reg);
sm_script_relocate_exports_sci11(&s->seg_manager, seg_id);
sm_script_initialise_objects_sci11(&s->seg_manager, s, seg_id);
reg.offset = getUInt16(heap->data);
sm_heap_relocate(&s->seg_manager, s, reg);
return seg_id;
}
int
script_instantiate(state_t *s, int script_nr) {
if (s->version >= SCI_VERSION(1, 001, 000))
return script_instantiate_sci11(s, script_nr);
else
return script_instantiate_sci0(s, script_nr);
}
void sm_mark_script_deleted(seg_manager_t* self, int script_nr);
void
script_uninstantiate_sci0(state_t *s, int script_nr, seg_id_t seg) {
reg_t reg = make_reg(seg, (s->version < SCI_VERSION_FTU_NEW_SCRIPT_HEADER) ? 2 : 0);
int objtype, objlength;
/* Make a pass over the object in order uninstantiate all superclasses */
objlength = 0;
do {
reg.offset += objlength; /* Step over the last checked object */
objtype = SEG_GET_HEAP(s, reg);
if (!objtype) break;
objlength = SEG_GET_HEAP(s, make_reg(reg.segment, 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 = OBJ_SUPERCLASS(s, reg); /* Get superclass... */
if (superclass >= 0) {
int superclass_script = s->classtable[superclass].script;
if (superclass_script == script_nr) {
if (sm_get_lockers(&s->seg_manager, reg.segment, SEG_ID))
sm_decrement_lockers(&s->seg_manager, reg.segment, SEG_ID); /* Decrease lockers if this is us ourselves */
} else
script_uninstantiate(s, 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(state_t *s, int script_nr) {
reg_t reg = make_reg(0, (s->version < SCI_VERSION_FTU_NEW_SCRIPT_HEADER) ? 2 : 0);
int i;
reg.segment = sm_seg_get(&s->seg_manager, script_nr);
if (!sm_script_is_loaded(&s->seg_manager, script_nr, SCRIPT_ID) || reg.segment <= 0) { /* Is it already loaded? */
/* sciprintf("Warning: unloading script 0x%x requested although not loaded\n", script_nr); */
/* This is perfectly valid SCI behaviour */
return;
}
sm_decrement_lockers(&s->seg_manager, reg.segment, SEG_ID); /* One less locker */
if (sm_get_lockers(&s->seg_manager, reg.segment, SEG_ID) > 0)
return;
/* Free all classtable references to this script */
for (i = 0; i < s->classtable_size; i++)
if (s->classtable[i].reg.segment == reg.segment)
s->classtable[i].reg = NULL_REG;
if (s->version < SCI_VERSION(1, 001, 000))
script_uninstantiate_sci0(s, script_nr, reg.segment);
else
sciprintf("FIXME: Add proper script uninstantiation for SCI 1.1\n");
if (sm_get_lockers(&s->seg_manager, reg.segment, SEG_ID))
return; /* if xxx.lockers > 0 */
/* Otherwise unload it completely */
/* Explanation: I'm starting to believe that this work is done by SCI itself. */
sm_mark_script_deleted(&s->seg_manager, script_nr);
if (script_checkloads_flag)
sciprintf("Unloaded script 0x%x.\n", script_nr);
return;
}
static void
_init_stack_base_with_selector(state_t *s, selector_t selector) {
s->stack_base[0] = make_reg(0, (word) selector);
s->stack_base[1] = NULL_REG;
}
static state_t *
_game_run(state_t *s, int restoring) {
state_t *successor = NULL;
int game_is_finished = 0;
do {
s->execution_stack_pos_changed = 0;
run_vm(s, (successor || restoring) ? 1 : 0);
if (s->restarting_flags & SCI_GAME_IS_RESTARTING_NOW) { /* Restart was requested? */
free(s->execution_stack);
s->execution_stack = NULL;
s->execution_stack_pos = -1;
s->execution_stack_pos_changed = 0;
game_exit(s);
script_free_engine(s);
script_init_engine(s, s->version);
game_init(s);
sfx_reset_player();
_init_stack_base_with_selector(s, s->selector_map.play);
/* Call the play selector */
send_selector(s, s->game_obj, s->game_obj,
s->stack_base, 2, s->stack_base);
script_abort_flag = 0;
s->restarting_flags = SCI_GAME_WAS_RESTARTED |
SCI_GAME_WAS_RESTARTED_AT_LEAST_ONCE;
} else {
successor = s->successor;
if (successor) {
game_exit(s);
script_free_vm_memory(s);
free(s);
s = successor;
if (!send_calls_allocated)
send_calls = (calls_struct_t*)sci_calloc(sizeof(calls_struct_t),
send_calls_allocated = 16);
if (script_abort_flag == SCRIPT_ABORT_WITH_REPLAY) {
sciprintf("Restarting with replay()\n");
s->execution_stack_pos = -1; /* Resatart with replay */
_init_stack_base_with_selector(s, s->selector_map.replay);
/* Call the replay selector */
send_selector(s, s->game_obj, s->game_obj,
s->stack_base, 2,
s->stack_base);
}
script_abort_flag = 0;
} else
game_is_finished = 1;
}
} while (!game_is_finished);
return s;
}
int objinfo(state_t *s, reg_t pos);
int
game_run(state_t **_s) {
state_t *s = *_s;
sciprintf(" Calling %s::play()\n", s->game_name);
_init_stack_base_with_selector(s, s->selector_map.play); /* Call the play selector */
/* Now: Register the first element on the execution stack- */
if (!send_selector(s, s->game_obj, s->game_obj,
s->stack_base, 2,
s->stack_base) || script_error_flag) {
objinfo(s, s->game_obj);
sciprintf("Failed to run the game! Aborting...\n");
return 1;
}
/* and ENGAGE! */
*_s = s = _game_run(s, 0);
sciprintf(" Game::play() finished.\n");
return 0;
}
int
game_restore(state_t **_s, char *game_name) {
state_t *s;
int debug_state = _debugstate_valid;
sciprintf("Restoring savegame '%s'...\n", game_name);
s = gamestate_restore(*_s, game_name);
if (!s) {
sciprintf("Restoring gamestate '%s' failed.\n", game_name);
return 1;
}
_debugstate_valid = debug_state;
script_abort_flag = 0;
s->restarting_flags = 0;
s->execution_stack_pos = -1; /* Resatart with replay */
_init_stack_base_with_selector(s, s->selector_map.replay);
/* Call the replay selector */
send_selector(s, s->game_obj, s->game_obj,
s->stack_base, 2,
s->stack_base);
*_s = s = _game_run(s, 1);
sciprintf(" Game::play() finished.\n");
return 0;
}
object_t *
obj_get(state_t *s, reg_t offset) {
mem_obj_t *memobj = GET_OBJECT_SEGMENT(s->seg_manager, offset.segment);
object_t *obj = NULL;
int idx;
if (memobj != NULL) {
if (memobj->type == MEM_OBJ_CLONES
&& ENTRY_IS_VALID(&memobj->data.clones, offset.offset))
obj = &(memobj->data.clones.table[offset.offset].entry);
else if (memobj->type == MEM_OBJ_SCRIPT) {
if (offset.offset <= memobj->data.script.buf_size
&& offset.offset >= -SCRIPT_OBJECT_MAGIC_OFFSET
&& RAW_IS_OBJECT(memobj->data.script.buf + offset.offset)) {
idx = RAW_GET_CLASS_INDEX(&(memobj->data.script), offset);
if (idx >= 0 && idx < memobj->data.script.objects_nr)
obj = memobj->data.script.objects + idx;
}
}
}
return obj;
}
const char *
obj_get_name(struct _state *s, reg_t pos) {
object_t *obj = obj_get(s, pos);
if (!obj)
return "<no such object>";
return
(const char*)(obj->base + obj->variables[SCRIPT_NAME_SELECTOR].offset);
}
void
quit_vm() {
script_abort_flag = 1; /* Terminate VM */
_debugstate_valid = 0;
_debug_seeking = 0;
_debug_step_running = 0;
}
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