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Aminet - June 1993 [Walnut Creek].iso
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bcpl4amiga.lha
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interp.cware.c
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C/C++ Source or Header
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1991-02-04
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5KB
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347 lines
#include "icint.h"
int interpret()
{
#ifdef cware
static int a, b, c, d, w, p;
static word *wp;
#else
register int a, b, c, d, w, p;
register word *wp;
#endif
#ifdef unix
register word *rmem = mem;
#define mem rmem
#endif
p = pp;
c = progvec;
cyclecount = 0;
fetch:
cyclecount++;
#ifndef cware
w = mem[c++];
if (w & DBIT)
d = mem[c++];
else
d = w & ABITS;
#ifdef DEBUG
fprintf(stderr, "%04x: %04x %05d\n", c - progvec - 1, w, d);
#endif DEBUG
if (w & PBIT)
d += p;
if (w & GBIT)
d += gp;
if (w & IBIT)
d = mem[d];
#ifdef profiling
++majinstr[(w >> FSHIFT) & 07];
#endif
switch ((w >> FSHIFT) & 07)
#else
#asm
MOV SI,WORD interpret_c_
INC WORD interpret_c_
SHL SI,1
ADD SI,WORD mem_
MOV AX,WORD [SI]
OR AX,AX
JGE _L1_
INC WORD interpret_c_
ADD SI,2
MOV DI,WORD [SI]
JMP _L2_
_L1_:
MOV BH,0
MOV BL,AL
MOV DI,BX
_L2_:
MOV AL,AH
ROR AX,1
JNC _L3_
ADD DI,WORD interpret_p_
_L3_:
ROR AX,1
JNC _L4_
ADD DI,WORD gp_
_L4_:
ROR AX,1
JNC _L5_
SHL DI,1
ADD DI,WORD mem_
MOV DI,WORD [DI]
_L5_:
MOV WORD interpret_d_,DI
AND AX,14
MOV BX,AX
JMP BYTE _L6_[BX]
_L6_:
DW OP_L
DW OP_S
DW OP_A
DW OP_J
DW OP_T
DW OP_F
DW OP_K
DW OP_X
#
#endif
{
#ifndef cware
case OP_L:
#else
#asm
OP_L:
#
#endif
b = a;
a = d;
goto fetch;
#ifndef cware
case OP_S:
#else
#asm
OP_S:
#
#endif
mem[d] = a;
goto fetch;
#ifndef cware
case OP_A:
#else
#asm
OP_A:
#
#endif
a += d;
goto fetch;
#ifndef cware
case OP_J:
#else
#asm
OP_J:
#
#endif
c = d;
goto fetch;
#ifndef cware
case OP_T:
#else
#asm
OP_T:
#
#endif
if (a)
c = d;
goto fetch;
#ifndef cware
case OP_F:
#else
#asm
OP_F:
#
#endif
if (!a)
c = d;
goto fetch;
#ifndef cware
case OP_K:
#else
#asm
OP_K:
#
#endif
d += p;
mem[d] = p;
mem[d+1] = c;
p = d;
c = a;
goto fetch;
#ifndef cware
case OP_X:
#ifdef profiling
++mininstr[d];
#endif
#else
#asm
OP_X:
#
#endif
switch (d)
{
case 0:
default:
fprintf(stderr, "Bad minor opcode %d at %d\n",
d, c - progvec - 1);
return (-1);
case 1:
a = mem[a];
goto fetch;
case 2:
a = -a;
goto fetch;
case 3:
a = ~a;
goto fetch;
case 4:
c = mem[p+1];
p = mem[p];
goto fetch;
case 5:
a *= b;
goto fetch;
case 6:
a = b / a;
goto fetch;
case 7:
a = b % a;
goto fetch;
case 8:
a += b;
goto fetch;
case 9:
a = b - a;
goto fetch;
case 10:
a = b == a ? ~0 : 0;
goto fetch;
case 11:
a = b != a ? ~0 : 0;
goto fetch;
case 12:
a = b < a ? ~0 : 0;
goto fetch;
case 13:
a = b >= a ? ~0 : 0;
goto fetch;
case 14:
a = b > a ? ~0 : 0;
goto fetch;
case 15:
a = b <= a ? ~0 : 0;
goto fetch;
case 16:
a = b << a;
goto fetch;
case 17:
a = b >> a;
goto fetch;
case 18:
a &= b;
goto fetch;
case 19:
a |= b;
goto fetch;
case 20:
a ^= b;
goto fetch;
case 21:
a ^= ~b;
goto fetch;
case 22:
return (0); /* finish */
case 23:
wp = &mem[c];
b = *wp++;
d = *wp++; /* switchon */
while (b-- != 0)
{
if (a == *wp++)
{
c = *wp++;
goto fetch;
}
wp++;
}
c = d;
goto fetch;
/*
// cases 24 upwards are only called from the following
// hand written intcode library - iclib:
// 11 lip2 x24 x4 g11l11 /selectinput
// 12 lip2 x25 x4 g12l12 /selectoutput
// 13 x26 x4 g13l13 /rdch
// 14 lip2 x27 x4 g14l14 /wrch
// 42 lip2 x28 x4 g42l42 /findinput
// 41 lip2 x29 x4 g41l41 /findoutput
// 30 lip2 x30 x4 g30l30 /stop
// 31 x31 x4 g31l31 /level
// 32 lip3 lip2 x32 g32l32 /longjump
// 46 x33 x4 g46l46 /endread
// 47 x34 x4 g47l47 /endwrite
// 40 lip3 lip2 x35 g40l40 /aptovec
// 85 lip3 lip2 x36 x4 g85l85 / getbyte
// 86 lip3 lip2 x37 x4 g86l86 / putbyte
// z
*/
case 24:
slctinput(a);
goto fetch;
case 25:
slctoutput(a);
goto fetch;
case 26:
a = rdch();
goto fetch;
case 27:
wrch(a);
goto fetch;
case 28:
a = findinput(a);
goto fetch;
case 29:
a = findoutput(a);
goto fetch;
case 30:
return (a); /* stop(a) */
case 31:
a = mem[p];
goto fetch; /* used in level() */
case 32:
p = a;
c = b; /* used in longjump(p,l) */
goto fetch;
case 33:
endread();
goto fetch;
case 34:
endwrite();
goto fetch;
case 35:
d = p+b+1; /* used in aptovec(f, n) */
mem[d] = mem[p];
mem[d+1] = mem[p+1];
mem[d+2] = p;
mem[d+3] = b;
p = d;
c = a;
goto fetch;
case 36:
a = icgetbyte(a, b); /* getbyte(s, i) */
goto fetch;
case 37:
icputbyte(a, b, mem[p+4]); /* putbyte(s, i, ch) */
goto fetch;
}
}
}