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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/endian.h"
#include "gob/gob.h"
#include "gob/parse.h"
#include "gob/global.h"
#include "gob/game.h"
#include "gob/inter.h"
namespace Gob {
Parse::Parse(GobEngine *vm) : _vm(vm) {
}
int32 Parse::encodePtr(byte *ptr, int type) {
int32 offset = 0;
switch (type) {
case kExecPtr:
offset = ptr - _vm->_game->_totFileData;
break;
case kInterVar:
offset = ptr - ((byte *) _vm->_inter->_variables->getAddressOff8(0));
break;
case kResStr:
offset = ptr - ((byte *) _vm->_global->_inter_resStr);
break;
default:
error("Parse::encodePtr(): Unknown pointer type");
}
assert((offset & 0xF0000000) == 0);
return (type << 28) | offset;
}
byte *Parse::decodePtr(int32 n) {
byte *ptr;
switch (n >> 28) {
case kExecPtr:
ptr = _vm->_game->_totFileData;
break;
case kInterVar:
ptr = (byte *) _vm->_inter->_variables->getAddressOff8(0);
break;
case kResStr:
ptr = (byte *) _vm->_global->_inter_resStr;
break;
default:
error("Parse::decodePtr(): Unknown pointer type");
}
return ptr + (n & 0x0FFFFFFF);
}
void Parse::skipExpr(char stopToken) {
int16 dimCount;
byte operation;
int16 num;
int16 dim;
num = 0;
while (true) {
operation = *_vm->_global->_inter_execPtr++;
if ((operation >= 14) && (operation <= OP_FUNC)) {
switch (operation) {
case 14:
_vm->_global->_inter_execPtr += 4;
if (*_vm->_global->_inter_execPtr == 97)
_vm->_global->_inter_execPtr++;
break;
case OP_LOAD_VAR_INT16:
case OP_LOAD_VAR_INT8:
case OP_LOAD_IMM_INT16:
case 23:
case 24:
_vm->_global->_inter_execPtr += 2;
break;
case OP_LOAD_IMM_INT32:
_vm->_global->_inter_execPtr += 4;
break;
case OP_LOAD_IMM_INT8:
_vm->_global->_inter_execPtr += 1;
break;
case OP_LOAD_IMM_STR:
_vm->_global->_inter_execPtr +=
strlen((char *) _vm->_global->_inter_execPtr) + 1;
break;
case OP_LOAD_VAR_STR:
_vm->_global->_inter_execPtr += 2;
if (*_vm->_global->_inter_execPtr == 13) {
_vm->_global->_inter_execPtr++;
skipExpr(OP_END_MARKER);
}
break;
case 15:
_vm->_global->_inter_execPtr += 2;
case OP_ARRAY_UINT8:
case OP_ARRAY_UINT32:
case OP_ARRAY_UINT16:
case OP_ARRAY_STR:
dimCount = _vm->_global->_inter_execPtr[2];
// skip header and dimensions
_vm->_global->_inter_execPtr += 3 + dimCount;
// skip indices
for (dim = 0; dim < dimCount; dim++)
skipExpr(OP_END_MARKER);
if ((operation == OP_ARRAY_STR) && (*_vm->_global->_inter_execPtr == 13)) {
_vm->_global->_inter_execPtr++;
skipExpr(OP_END_MARKER);
}
break;
case OP_FUNC:
_vm->_global->_inter_execPtr++;
skipExpr(OP_END_EXPR);
}
continue;
} // if ((operation >= OP_ARRAY_UINT8) && (operation <= OP_FUNC))
if (operation == OP_BEGIN_EXPR) {
num++;
continue;
}
if ((operation == OP_NOT) || ((operation >= OP_NEG) && (operation <= 8)))
continue;
if ((operation >= OP_OR) && (operation <= OP_NEQ))
continue;
if (operation == OP_END_EXPR)
num--;
if (operation != stopToken)
continue;
if ((stopToken != OP_END_EXPR) || (num < 0))
return;
}
}
void Parse::printExpr(char stopToken) {
// Expression printing disabled by default
return;
byte *savedPos = _vm->_global->_inter_execPtr;
printExpr_internal(stopToken);
// restore IP to start of expression
_vm->_global->_inter_execPtr = savedPos;
}
void Parse::printExpr_internal(char stopToken) {
int16 dimCount;
byte operation;
int16 num;
int16 dim;
byte *arrDesc;
byte func;
num = 0;
while (true) {
operation = *_vm->_global->_inter_execPtr++;
if ((operation >= OP_ARRAY_UINT8) && (operation <= OP_FUNC)) {
// operands
switch (operation) {
case OP_LOAD_VAR_INT16: // int16 variable load
debugN(5, "var16_%d", _vm->_inter->load16());
break;
case OP_LOAD_VAR_INT8: // int8 variable load:
debugN(5, "var8_%d", _vm->_inter->load16());
break;
case OP_LOAD_IMM_INT32: // int32/uint32 immediate
debugN(5, "%d", READ_LE_UINT32(_vm->_global->_inter_execPtr));
_vm->_global->_inter_execPtr += 4;
break;
case OP_LOAD_IMM_INT16: // int16 immediate
debugN(5, "%d", _vm->_inter->load16());
break;
case OP_LOAD_IMM_INT8: // int8 immediate
debugN(5, "%d", (int8) *_vm->_global->_inter_execPtr++);
break;
case OP_LOAD_IMM_STR: // string immediate
debugN(5, "\42%s\42", _vm->_global->_inter_execPtr);
_vm->_global->_inter_execPtr +=
strlen((char *) _vm->_global->_inter_execPtr) + 1;
break;
case 23: // uint32 variable load
case 24: // uint32 variable load as uint16
debugN(5, "var_%d", _vm->_inter->load16());
break;
case OP_LOAD_VAR_STR: // string variable load
debugN(5, "(&var_%d)", _vm->_inter->load16());
if (*_vm->_global->_inter_execPtr == 13) {
_vm->_global->_inter_execPtr++;
debugN(5, "{");
printExpr_internal(OP_END_MARKER); // this also prints the closing }
}
break;
case OP_ARRAY_UINT8: // uint8 array access
case OP_ARRAY_UINT32: // uint32 array access
case OP_ARRAY_UINT16: // uint16 array access
case OP_ARRAY_STR: // string array access
debugN(5, "\n");
if (operation == OP_ARRAY_STR)
debugN(5, "(&");
debugN(5, "var_%d[", _vm->_inter->load16());
dimCount = *_vm->_global->_inter_execPtr++;
arrDesc = _vm->_global->_inter_execPtr;
_vm->_global->_inter_execPtr += dimCount;
for (dim = 0; dim < dimCount; dim++) {
printExpr_internal(OP_END_MARKER);
debugN(5, " of %d", (int16) arrDesc[dim]);
if (dim != dimCount - 1)
debugN(5, ",");
}
debugN(5, "]");
if (operation == OP_ARRAY_STR)
debugN(5, ")");
if ((operation == OP_ARRAY_STR) && (*_vm->_global->_inter_execPtr == 13)) {
_vm->_global->_inter_execPtr++;
debugN(5, "{");
printExpr_internal(OP_END_MARKER); // this also prints the closing }
}
break;
case OP_FUNC: // function
func = *_vm->_global->_inter_execPtr++;
if (func == FUNC_SQR)
debugN(5, "sqr(");
else if (func == FUNC_RAND)
debugN(5, "rand(");
else if (func == FUNC_ABS)
debugN(5, "abs(");
else if ((func == FUNC_SQRT1) || (func == FUNC_SQRT2) || (func == FUNC_SQRT3))
debugN(5, "sqrt(");
else
debugN(5, "id(");
printExpr_internal(OP_END_EXPR);
break;
}
continue;
} // if ((operation >= OP_ARRAY_UINT8) && (operation <= OP_FUNC))
// operators
switch (operation) {
case OP_BEGIN_EXPR:
debugN(5, "(");
break;
case OP_NOT:
debugN(5, "!");
break;
case OP_END_EXPR:
debugN(5, ")");
break;
case OP_NEG:
debugN(5, "-");
break;
case OP_ADD:
debugN(5, "+");
break;
case OP_SUB:
debugN(5, "-");
break;
case OP_BITOR:
debugN(5, "|");
break;
case OP_MUL:
debugN(5, "*");
break;
case OP_DIV:
debugN(5, "/");
break;
case OP_MOD:
debugN(5, "%%");
break;
case OP_BITAND:
debugN(5, "&");
break;
case OP_OR:
debugN(5, "||");
break;
case 31:
debugN(5, "&&");
break;
case OP_LESS:
debugN(5, "<");
break;
case OP_LEQ:
debugN(5, "<=");
break;
case OP_GREATER:
debugN(5, ">");
break;
case OP_GEQ:
debugN(5, ">=");
break;
case OP_EQ:
debugN(5, "==");
break;
case OP_NEQ:
debugN(5, "!=");
break;
case 99:
debugN(5, "\n");
break;
case OP_END_MARKER:
debugN(5, "}");
if (stopToken != OP_END_MARKER) {
debugN(5, "Closing paren without opening?");
}
break;
default:
debugN(5, "<%d>", (int16) operation);
error("Parse::printExpr(): invalid operator in expression");
break;
}
if (operation == OP_BEGIN_EXPR) {
num++;
continue;
}
if ((operation == OP_NOT) || ((operation >= OP_NEG) && (operation <= 8)))
continue;
if ((operation >= OP_OR) && (operation <= OP_NEQ))
continue;
if (operation == OP_END_EXPR)
num--;
if (operation == stopToken) {
if ((stopToken != OP_END_EXPR) || (num < 0)) {
return;
}
}
}
}
void Parse::printVarIndex() {
byte *arrDesc;
int16 dim;
int16 dimCount;
int16 operation;
int16 temp;
byte *pos = _vm->_global->_inter_execPtr;
operation = *_vm->_global->_inter_execPtr++;
switch (operation) {
case 23:
case OP_LOAD_VAR_STR:
temp = _vm->_inter->load16() * 4;
debugN(5, "&var_%d", temp);
if ((operation == OP_LOAD_VAR_STR) && (*_vm->_global->_inter_execPtr == 13)) {
_vm->_global->_inter_execPtr++;
debugN(5, "+");
printExpr(OP_END_MARKER);
}
break;
case OP_ARRAY_UINT32:
case OP_ARRAY_STR:
debugN(5, "&var_%d[", _vm->_inter->load16());
dimCount = *_vm->_global->_inter_execPtr++;
arrDesc = _vm->_global->_inter_execPtr;
_vm->_global->_inter_execPtr += dimCount;
for (dim = 0; dim < dimCount; dim++) {
printExpr(OP_END_MARKER);
debugN(5, " of %d", (int16) arrDesc[dim]);
if (dim != dimCount - 1)
debugN(5, ",");
}
debugN(5, "]");
if ((operation == OP_ARRAY_STR) && (*_vm->_global->_inter_execPtr == 13)) {
_vm->_global->_inter_execPtr++;
debugN(5, "+");
printExpr(OP_END_MARKER);
}
break;
default:
debugN(5, "var_0");
break;
}
debugN(5, "\n");
_vm->_global->_inter_execPtr = pos;
return;
}
int Parse::cmpHelper(byte *operPtr, int32 *valPtr) {
byte var_C = operPtr[-3];
int cmpTemp = 0;
if (var_C == OP_LOAD_IMM_INT16) {
cmpTemp = (int)valPtr[-3] - (int)valPtr[-1];
} else if (var_C == OP_LOAD_IMM_STR) {
if ((char *)decodePtr(valPtr[-3]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, (char *)decodePtr(valPtr[-3]));
valPtr[-3] = encodePtr((byte *) _vm->_global->_inter_resStr, kResStr);
}
cmpTemp = strcmp(_vm->_global->_inter_resStr, (char *)decodePtr(valPtr[-1]));
}
return cmpTemp;
}
} // End of namespace Gob
|
