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advexe.c
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advexe.c
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/* advexe.c - adventure code executer */
/*
Copyright (c) 1993, by David Michael Betz
All rights reserved
*/
#include <setjmp.h>
#include "advint.h"
#include "advdbs.h"
/* external variables */
extern int nouns[],*adjectives[];
/* local variables */
static int *sp,*fp,*efp,*top,pc,opcode;
static int stack[STKSIZE];
static jmp_buf trap;
/* external routines */
extern char *trm_get();
/* forward declarations */
extern void (*optab[])(void);
static void opCALL(void);
static void opSEND(void);
static void opRETURN(void);
static void opTSPACE(void);
static void opTMP(void);
static void opTSET(void);
static void opARG(void);
static void opASET(void);
static void opBRT(void);
static void opBRF(void);
static void opBR(void);
static void opT(void);
static void opNIL(void);
static void opPUSH(void);
static void opNOT(void);
static void opADD(void);
static void opSUB(void);
static void opMUL(void);
static void opDIV(void);
static void opREM(void);
static void opBAND(void);
static void opBOR(void);
static void opBNOT(void);
static void opLT(void);
static void opEQ(void);
static void opGT(void);
static void opLIT(void);
static void opSPLIT(void);
static void opSNLIT(void);
static void opVAR(void);
static void opSVAR(void);
static void opSET(void);
static void opSSET(void);
static void opGETP(void);
static void opSETP(void);
static void opPRINT(void);
static void opPNUMBER(void);
static void opPNOUN(void);
static void opTERPRI(void);
static void opEXIT(void);
static void opYORN(void);
static void opCLASS(void);
static void opMATCH(void);
static void opSAVE(void);
static void opRESTORE(void);
static void opRESTART(void);
static void opCATCH(void);
static void opCDONE(void);
static void opTHROW(void);
static void opPARSE(void);
static void opNEXT(void);
static void opXVAR(void);
static void opXSET(void);
static void opXPLIT(void);
static void opXNLIT(void);
static void badopcode(void);
static int getboperand(void);
static int getwoperand(void);
/* execute - execute adventure code */
void execute(int code)
{
/* initialize */
sp = fp = top = stack + STKSIZE;
efp = NULL;
pc = code;
/* trap exits */
if (setjmp(trap))
return;
/* execute the code */
for (;;) {
/* get the opcode */
opcode = getcbyte(pc); ++pc;
/* printf("%04x: %02x\n",pc-1,opcode); */
/* execute the instruction */
((*optab[opcode]))();
}
}
static void opCALL(void)
{
*--sp = getboperand();
*--sp = pc;
*--sp = (int)(top - fp);
fp = sp;
pc = getafield(fp[fp[2]+3],A_CODE);
}
static void opSEND(void)
{
register int p2;
*--sp = getboperand();
*--sp = pc;
*--sp = (int)(top - fp);
fp = sp;
p2 = ((p2 = fp[fp[2]+3]) ? getofield(p2,O_CLASS) : fp[fp[2]+2]);
if (p2 && (p2 = getp(p2,fp[fp[2]+1])))
pc = getafield(p2,A_CODE);
else {
*sp = NIL;
opRETURN();
}
}
static void opRETURN(void)
{
register int p2,p3;
if (fp == top)
longjmp(trap,1);
else {
p2 = *sp;
sp = fp;
fp = top - *sp++;
pc = *sp++;
p3 = *sp++;
sp += p3;
*sp = p2;
}
}
static void opTSPACE(void)
{
sp -= getboperand();
}
static void opTMP(void)
{
*sp = fp[-getboperand()-1];
}
static void opTSET(void)
{
fp[-getboperand()-1] = *sp;
}
static void opARG(void)
{
register int p2;
p2 = getboperand();
if (p2 >= fp[2])
error("too few arguments: %d %d",p2+1,fp[2]);
*sp = fp[p2+3];
}
static void opASET(void)
{
register int p2;
p2 = getboperand();
if (p2 >= fp[2])
error("too few arguments: %d %d",p2+1,fp[2]);
fp[p2+3] = *sp;
}
static void opBRT(void)
{
pc = (*sp ? getwoperand() : pc+2);
}
static void opBRF(void)
{
pc = (*sp ? pc+2 : getwoperand());
}
static void opBR(void)
{
pc = getwoperand();
}
static void opT(void)
{
*sp = T;
}
static void opNIL(void)
{
*sp = NIL;
}
static void opPUSH(void)
{
*--sp = NIL;
}
static void opNOT(void)
{
*sp = (*sp ? NIL : T);
}
static void opADD(void)
{
register int p2;
p2 = *sp++;
*sp += p2;
}
static void opSUB(void)
{
register int p2;
p2 = *sp++;
*sp -= p2;
}
static void opMUL(void)
{
register int p2;
p2 = *sp++;
*sp *= p2;
}
static void opDIV(void)
{
register int p2;
p2 = *sp++;
*sp = (p2 == 0 ? 0 : *sp / p2);
}
static void opREM(void)
{
register int p2;
p2 = *sp++;
*sp = (p2 == 0 ? 0 : *sp % p2);
}
static void opBAND(void)
{
register int p2;
p2 = *sp++;
*sp &= p2;
}
static void opBOR(void)
{
register int p2;
p2 = *sp++;
*sp |= p2;
}
static void opBNOT(void)
{
*sp = ~*sp;
}
static void opLT(void)
{
register int p2;
p2 = *sp++;
*sp = (*sp < p2 ? T : NIL);
}
static void opEQ(void)
{
register int p2;
p2 = *sp++;
*sp = (*sp == p2 ? T : NIL);
}
static void opGT(void)
{
register int p2;
p2 = *sp++;
*sp = (*sp > p2 ? T : NIL);
}
static void opLIT(void)
{
*sp = getwoperand();
}
static void opSPLIT(void)
{
*sp = getboperand();
}
static void opSNLIT(void)
{
*sp = -getboperand();
}
static void opVAR(void)
{
*sp = getvalue(getwoperand());
}
static void opSVAR(void)
{
*sp = getvalue(getboperand());
}
static void opSET(void)
{
setvalue(getwoperand(),*sp);
}
static void opSSET(void)
{
setvalue(getboperand(),*sp);
}
static void opGETP(void)
{
register int p2;
p2 = *sp++;
*sp = getp(*sp,p2);
}
static void opSETP(void)
{
register int p2,p3;
p3 = *sp++;
p2 = *sp++;
*sp = setp(*sp,p2,p3);
}
static void opPRINT(void)
{
register int ch;
msg_open(*sp);
while ((ch = msg_byte()) != 0)
trm_chr(ch);
}
static void opPNUMBER(void)
{
char buf[10];
sprintf(buf,"%d",*sp);
trm_str(buf);
}
static void opPNOUN(void)
{
show_noun(*sp);
}
static void opTERPRI(void)
{
trm_chr('\n');
}
static void opEXIT(void)
{
longjmp(trap,1);
}
static void opYORN(void)
{
char *p;
p = trm_get();
*sp = (p && (*p == 'Y' || *p == 'y') ? T : NIL);
}
static void opCLASS(void)
{
*sp = getofield(*sp,O_CLASS);
}
static void opMATCH(void)
{
register int p2;
p2 = *sp++;
*sp = (match(*sp,nouns[p2-1],adjectives[p2-1]) ? T : NIL);
}
static void opSAVE(void)
{
*sp = db_save();
}
static void opRESTORE(void)
{
*sp = db_restore();
}
static void opRESTART(void)
{
*sp = db_restart();
}
static void opCATCH(void)
{
*--sp = pc;
*--sp = (int)(top - fp);
*--sp = (int)(top - efp);
efp = sp;
*--sp = NIL;
pc += 2;
}
static void opCDONE(void)
{
register int p2;
p2 = *sp++;
efp = top - *sp++;
fp = top - *sp++;
*++sp = p2;
}
static void opTHROW(void)
{
register int p2;
for (; efp != NULL; efp = top - *efp)
if (sp[1] == efp[3])
break;
if (efp) {
p2 = *sp;
sp = efp;
efp = top - *sp++;
fp = top - *sp++;
pc = *sp++;
pc = getwoperand();
*sp = p2;
}
else
error("no target for throw: %d",sp[1]);
}
static void opPARSE(void)
{
*sp = parse();
}
static void opNEXT(void)
{
*sp = next();
}
static void opXVAR(void)
{
*sp = getvalue(opcode - OP_XVAR);
}
static void opXSET(void)
{
setvalue(opcode - OP_XSET,*sp);
}
static void opXPLIT(void)
{
*sp = opcode - OP_XPLIT;
}
static void opXNLIT(void)
{
*sp = OP_XNLIT - opcode;
}
static void badopcode(void)
{
error("bad opcode: %d",opcode);
}
/* getboperand - get data byte */
static int getboperand(void)
{
int data;
data = getcbyte(pc); pc += 1;
return (data);
}
/* getwoperand - get data word */
static int getwoperand(void)
{
int data;
data = getcword(pc); pc += 2;
return (data);
}
/* opcode dispatch table */
void (*optab[])(void) = {
badopcode, /* 00 (undefined) */
opBRT, /* 01 branch on true */
opBRF, /* 02 branch on false */
opBR, /* 03 branch unconditionally */
opT, /* 04 load top of stack with t */
opNIL, /* 05 load top of stack with nil */
opPUSH, /* 06 push nil onto stack */
opNOT, /* 07 logical negate top of stack */
opADD, /* 08 add two numeric expressions */
opSUB, /* 09 subtract two numeric expressions */
opMUL, /* 0A multiply two numeric expressions */
opDIV, /* 0B divide two numeric expressions */
opREM, /* 0C remainder of two numeric expressions */
opBAND, /* 0D bitwise and of two numeric expressions */
opBOR, /* 0E bitwise or of two numeric expressions */
opBNOT, /* 0F bitwise not of two numeric expressions */
opLT, /* 10 less than */
opEQ, /* 11 equal to */
opGT, /* 12 greater than */
opLIT, /* 13 load literal */
opVAR, /* 14 load a variable value */
opGETP, /* 15 get the value of an object property */
opSETP, /* 16 set the value of an object property */
opSET, /* 17 set the value of a variable */
opPRINT, /* 18 print messages */
opTERPRI, /* 19 terminate the print line */
opPNUMBER, /* 1A print a number */
opEXIT, /* 1B exit the program */
opRETURN, /* 1C return from interpreter */
opCALL, /* 1D call a function */
opSVAR, /* 1E short load a variable */
opSSET, /* 1F short set a variable */
opSPLIT, /* 20 short load a positive literal */
opSNLIT, /* 21 short load a negative literal */
opYORN, /* 22 yes-or-no predicate */
opSAVE, /* 23 save data structures */
opRESTORE, /* 24 restore data structures */
opARG, /* 25 load an argument value */
opASET, /* 26 set an argument value */
opTMP, /* 27 load a temporary variable value */
opTSET, /* 28 set a temporary variable */
opTSPACE, /* 29 allocate temporary variable space */
opCLASS, /* 2A get the class of an object */
opMATCH, /* 2B match a noun phrase with an object */
opPNOUN, /* 2C print a noun phrase */
opRESTART, /* 2D restart the current game */
badopcode, /* 2E (undefined) */
badopcode, /* 2F (undefined) */
opSEND, /* 30 send a message to an object */
opCATCH, /* 31 catch a signal (establish a catch frame) */
opCDONE, /* 32 remove a catch frame from the stack */
opTHROW, /* 33 throw a signal */
opPARSE, /* 34 parse the next input line */
opNEXT, /* 35 get the next command */
badopcode, /* 36 (undefined) */
badopcode, /* 37 (undefined) */
badopcode, /* 38 (undefined) */
badopcode, /* 39 (undefined) */
badopcode, /* 3A (undefined) */
badopcode, /* 3B (undefined) */
badopcode, /* 3C (undefined) */
badopcode, /* 3D (undefined) */
badopcode, /* 3E (undefined) */
badopcode, /* 3F (undefined) */
opXVAR, /* 40 extra short load a variable */
opXVAR, /* 41 extra short load a variable */
opXVAR, /* 42 extra short load a variable */
opXVAR, /* 43 extra short load a variable */
opXVAR, /* 44 extra short load a variable */
opXVAR, /* 45 extra short load a variable */
opXVAR, /* 46 extra short load a variable */
opXVAR, /* 47 extra short load a variable */
opXVAR, /* 48 extra short load a variable */
opXVAR, /* 49 extra short load a variable */
opXVAR, /* 4A extra short load a variable */
opXVAR, /* 4B extra short load a variable */
opXVAR, /* 4C extra short load a variable */
opXVAR, /* 4D extra short load a variable */
opXVAR, /* 4E extra short load a variable */
opXVAR, /* 4F extra short load a variable */
opXVAR, /* 50 extra short load a variable */
opXVAR, /* 51 extra short load a variable */
opXVAR, /* 52 extra short load a variable */
opXVAR, /* 53 extra short load a variable */
opXVAR, /* 54 extra short load a variable */
opXVAR, /* 55 extra short load a variable */
opXVAR, /* 56 extra short load a variable */
opXVAR, /* 57 extra short load a variable */
opXVAR, /* 58 extra short load a variable */
opXVAR, /* 59 extra short load a variable */
opXVAR, /* 5A extra short load a variable */
opXVAR, /* 5B extra short load a variable */
opXVAR, /* 5C extra short load a variable */
opXVAR, /* 5D extra short load a variable */
opXVAR, /* 5E extra short load a variable */
opXVAR, /* 5F extra short load a variable */
opXSET, /* 60 extra short set a variable */
opXSET, /* 61 extra short set a variable */
opXSET, /* 62 extra short set a variable */
opXSET, /* 63 extra short set a variable */
opXSET, /* 64 extra short set a variable */
opXSET, /* 65 extra short set a variable */
opXSET, /* 66 extra short set a variable */
opXSET, /* 67 extra short set a variable */
opXSET, /* 68 extra short set a variable */
opXSET, /* 69 extra short set a variable */
opXSET, /* 6A extra short set a variable */
opXSET, /* 6B extra short set a variable */
opXSET, /* 6C extra short set a variable */
opXSET, /* 6D extra short set a variable */
opXSET, /* 6E extra short set a variable */
opXSET, /* 6F extra short set a variable */
opXSET, /* 70 extra short set a variable */
opXSET, /* 71 extra short set a variable */
opXSET, /* 72 extra short set a variable */
opXSET, /* 73 extra short set a variable */
opXSET, /* 74 extra short set a variable */
opXSET, /* 75 extra short set a variable */
opXSET, /* 76 extra short set a variable */
opXSET, /* 77 extra short set a variable */
opXSET, /* 78 extra short set a variable */
opXSET, /* 79 extra short set a variable */
opXSET, /* 7A extra short set a variable */
opXSET, /* 7B extra short set a variable */
opXSET, /* 7C extra short set a variable */
opXSET, /* 7D extra short set a variable */
opXSET, /* 7E extra short set a variable */
opXSET, /* 7F extra short set a variable */
opXPLIT, /* 80 extra short load a positive literal */
opXPLIT, /* 81 extra short load a positive literal */
opXPLIT, /* 82 extra short load a positive literal */
opXPLIT, /* 83 extra short load a positive literal */
opXPLIT, /* 84 extra short load a positive literal */
opXPLIT, /* 85 extra short load a positive literal */
opXPLIT, /* 86 extra short load a positive literal */
opXPLIT, /* 87 extra short load a positive literal */
opXPLIT, /* 88 extra short load a positive literal */
opXPLIT, /* 89 extra short load a positive literal */
opXPLIT, /* 8A extra short load a positive literal */
opXPLIT, /* 8B extra short load a positive literal */
opXPLIT, /* 8C extra short load a positive literal */
opXPLIT, /* 8D extra short load a positive literal */
opXPLIT, /* 8E extra short load a positive literal */
opXPLIT, /* 8F extra short load a positive literal */
opXPLIT, /* 90 extra short load a positive literal */
opXPLIT, /* 91 extra short load a positive literal */
opXPLIT, /* 92 extra short load a positive literal */
opXPLIT, /* 93 extra short load a positive literal */
opXPLIT, /* 94 extra short load a positive literal */
opXPLIT, /* 95 extra short load a positive literal */
opXPLIT, /* 96 extra short load a positive literal */
opXPLIT, /* 97 extra short load a positive literal */
opXPLIT, /* 98 extra short load a positive literal */
opXPLIT, /* 99 extra short load a positive literal */
opXPLIT, /* 9A extra short load a positive literal */
opXPLIT, /* 9B extra short load a positive literal */
opXPLIT, /* 9C extra short load a positive literal */
opXPLIT, /* 9D extra short load a positive literal */
opXPLIT, /* 9E extra short load a positive literal */
opXPLIT, /* 9F extra short load a positive literal */
opXPLIT, /* A0 extra short load a positive literal */
opXPLIT, /* A1 extra short load a positive literal */
opXPLIT, /* A2 extra short load a positive literal */
opXPLIT, /* A3 extra short load a positive literal */
opXPLIT, /* A4 extra short load a positive literal */
opXPLIT, /* A5 extra short load a positive literal */
opXPLIT, /* A6 extra short load a positive literal */
opXPLIT, /* A7 extra short load a positive literal */
opXPLIT, /* A8 extra short load a positive literal */
opXPLIT, /* A9 extra short load a positive literal */
opXPLIT, /* AA extra short load a positive literal */
opXPLIT, /* AB extra short load a positive literal */
opXPLIT, /* AC extra short load a positive literal */
opXPLIT, /* AD extra short load a positive literal */
opXPLIT, /* AE extra short load a positive literal */
opXPLIT, /* AF extra short load a positive literal */
opXPLIT, /* B0 extra short load a positive literal */
opXPLIT, /* B1 extra short load a positive literal */
opXPLIT, /* B2 extra short load a positive literal */
opXPLIT, /* B3 extra short load a positive literal */
opXPLIT, /* B4 extra short load a positive literal */
opXPLIT, /* B5 extra short load a positive literal */
opXPLIT, /* B6 extra short load a positive literal */
opXPLIT, /* B7 extra short load a positive literal */
opXPLIT, /* B8 extra short load a positive literal */
opXPLIT, /* B9 extra short load a positive literal */
opXPLIT, /* BA extra short load a positive literal */
opXPLIT, /* BB extra short load a positive literal */
opXPLIT, /* BC extra short load a positive literal */
opXPLIT, /* BD extra short load a positive literal */
opXPLIT, /* BE extra short load a positive literal */
opXPLIT, /* BF extra short load a positive literal */
opXNLIT, /* C0 extra short load a negative literal */
opXNLIT, /* C1 extra short load a negative literal */
opXNLIT, /* C2 extra short load a negative literal */
opXNLIT, /* C3 extra short load a negative literal */
opXNLIT, /* C4 extra short load a negative literal */
opXNLIT, /* C5 extra short load a negative literal */
opXNLIT, /* C6 extra short load a negative literal */
opXNLIT, /* C7 extra short load a negative literal */
opXNLIT, /* C8 extra short load a negative literal */
opXNLIT, /* C9 extra short load a negative literal */
opXNLIT, /* CA extra short load a negative literal */
opXNLIT, /* CB extra short load a negative literal */
opXNLIT, /* CC extra short load a negative literal */
opXNLIT, /* CD extra short load a negative literal */
opXNLIT, /* CE extra short load a negative literal */
opXNLIT, /* CF extra short load a negative literal */
opXNLIT, /* D0 extra short load a negative literal */
opXNLIT, /* D1 extra short load a negative literal */
opXNLIT, /* D2 extra short load a negative literal */
opXNLIT, /* D3 extra short load a negative literal */
opXNLIT, /* D4 extra short load a negative literal */
opXNLIT, /* D5 extra short load a negative literal */
opXNLIT, /* D6 extra short load a negative literal */
opXNLIT, /* D7 extra short load a negative literal */
opXNLIT, /* D8 extra short load a negative literal */
opXNLIT, /* D9 extra short load a negative literal */
opXNLIT, /* DA extra short load a negative literal */
opXNLIT, /* DB extra short load a negative literal */
opXNLIT, /* DC extra short load a negative literal */
opXNLIT, /* DD extra short load a negative literal */
opXNLIT, /* DE extra short load a negative literal */
opXNLIT, /* DF extra short load a negative literal */
opXNLIT, /* E0 extra short load a negative literal */
opXNLIT, /* E1 extra short load a negative literal */
opXNLIT, /* E2 extra short load a negative literal */
opXNLIT, /* E3 extra short load a negative literal */
opXNLIT, /* E4 extra short load a negative literal */
opXNLIT, /* E5 extra short load a negative literal */
opXNLIT, /* E6 extra short load a negative literal */
opXNLIT, /* E7 extra short load a negative literal */
opXNLIT, /* E8 extra short load a negative literal */
opXNLIT, /* E9 extra short load a negative literal */
opXNLIT, /* EA extra short load a negative literal */
opXNLIT, /* EB extra short load a negative literal */
opXNLIT, /* EC extra short load a negative literal */
opXNLIT, /* ED extra short load a negative literal */
opXNLIT, /* EE extra short load a negative literal */
opXNLIT, /* EF extra short load a negative literal */
opXNLIT, /* F0 extra short load a negative literal */
opXNLIT, /* F1 extra short load a negative literal */
opXNLIT, /* F2 extra short load a negative literal */
opXNLIT, /* F3 extra short load a negative literal */
opXNLIT, /* F4 extra short load a negative literal */
opXNLIT, /* F5 extra short load a negative literal */
opXNLIT, /* F6 extra short load a negative literal */
opXNLIT, /* F7 extra short load a negative literal */
opXNLIT, /* F8 extra short load a negative literal */
opXNLIT, /* F9 extra short load a negative literal */
opXNLIT, /* FA extra short load a negative literal */
opXNLIT, /* FB extra short load a negative literal */
opXNLIT, /* FC extra short load a negative literal */
opXNLIT, /* FD extra short load a negative literal */
opXNLIT, /* FE extra short load a negative literal */
opXNLIT /* FF extra short load a negative literal */
};