luxferre/equi
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Luxferre
2022-08-09 07:47:50 +03:00
parent 898f1f22d3
commit 31166c8e7f
2 changed files with 54 additions and 20 deletions
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Makefile
+1 -1
View File
@@ -7,7 +7,7 @@ DFLAGS=
desktopcc:
cc -std=c89 -Os -o $(PROJNAME) $(CFILES) $(DFLAGS)
strip $(PROJNAME)
#strip $(PROJNAME)
tcc:
tcc -std=c89 -o $(PROJNAME) $(CFILES) $(DFLAGS)
equi.c
+53 -19
View File
@@ -80,8 +80,8 @@
*/
struct CLTEntry {
uchar name[CLT_ENTRY_LEN]; /* compiled word name */
ushort loc; /* compiled word location */
ushort nhash; /* compiled word name hash */
ushort loc; /* compiled word location */
};
struct EquiRAM {
@@ -121,6 +121,7 @@ enum EquiErrors {
CLT_OVERFLOW,
CMD_OVERFLOW,
INVALID_INSTRUCTION,
INVALID_WORD,
PORT_IO_ERROR
};
@@ -147,6 +148,9 @@ void trapout(errcode) {
case INVALID_INSTRUCTION:
cerr("Invalid instruction");
break;
case INVALID_WORD:
cerr("Word not found in CLT");
break;
case PORT_IO_ERROR:
cerr("Port I/O error");
break;
@@ -216,16 +220,20 @@ void pushRet(ushort val) {
/* pop a value from the main stack */
ushort popMain() {
if(ram.msp == 0)
if(ram.msp == 0) {
trapout(STACK_UNDERFLOW);
return 0;
}
else
return ram.main_stack[--ram.msp];
}
/* pop a value from the return stack */
ushort popRet() {
if(ram.rsp == 0)
if(ram.rsp == 0) {
trapout(STACK_UNDERFLOW);
return 0;
}
else
return ram.return_stack[--ram.rsp];
}
@@ -239,8 +247,10 @@ void pushLit(uchar c) {
/* pop a character from the literal stack */
uchar popLit() {
if(ram.lsp == 0)
if(ram.lsp == 0) {
trapout(STACK_UNDERFLOW);
return 0;
}
else
return ram.literal_stack[--ram.lsp];
}
@@ -253,7 +263,7 @@ void clearLit() {
/* shape 2-byte vlaue on the main stack from the 4 values of the literal stack */
void pushLitVal(strict) {
uchar p1, p2, p3, p4;
if(ram.lsp < 4) { /* if we don't strictly expect 4 bytes, do nothing */
if(ram.lsp < 4U) { /* if we don't strictly expect 4 bytes, do nothing */
if(strict) trapout(STACK_UNDERFLOW);
else {
ram.lsp = 0; /* clear the literal stack */
@@ -265,19 +275,33 @@ void pushLitVal(strict) {
p3 = popLit();
p2 = popLit();
p1 = popLit();
pushMain((p1<<12) | (p2<<8) | (p3<<4) | p4);
pushMain((p1<<12U) | (p2<<8U) | (p3<<4U) | p4);
ram.lsp = 0; /* clear the literal stack */
}
}
/* CCITT CRC16 helper */
ushort crc16(const uchar* data_p, uchar length) {
uchar x;
ushort crc = 0xFFFFu;
while(length--) {
x = crc>>8U ^ *data_p++;
x ^= x>>4U;
crc = (crc << 8U) ^ ((ushort)(x << 12U)) ^ ((ushort)(x << 5U)) ^ ((ushort)x);
}
return crc;
}
/* Main interpreter loop */
void equi_main_loop() {
uchar instr, i;
ushort lhash, pbuf;
/* reset all stacks before running and reinit CLT */
ram.msp = ram.rsp = ram.lsp = ram.cltp = 0;
/* reset pc */
ram.pc = 65535;
ram.pc = 65535U;
while(1) { /* iterate over the instructions in the command buffer */
instr = ram.cmdbuf[++ram.pc];
/* first, check for II mode */
@@ -289,17 +313,16 @@ void equi_main_loop() {
/* then, check for compilation mode */
if(ram.CM) {
if(instr == INS_CMEND) { /* trigger word compilation logic as per the spec */
if(ram.lsp < CLT_ENTRY_LEN)
trapout(STACK_UNDERFLOW);
ram.cmdbuf[ram.pc] = INS_RET; /* in-place patch this instruction to R */
/* compiled words are saved vice versa to save code size */
for(i=0;i<CLT_ENTRY_LEN;++i)
ram.clt[ram.cltp].name[i] = popLit();
/* hash and save compiled word */
ram.clt[ram.cltp].nhash = crc16(&ram.literal_stack[ram.lsp-CLT_ENTRY_LEN], CLT_ENTRY_LEN);
ram.lsp = 0; /* clear the literal stack */
ram.clt[ram.cltp].loc = ram.cbp; /* stored the compiled code location from the most recent CBP value */
++ram.cltp; /* increase the word */
if(ram.cltp == CLT_ENTRIES_MAX) {
if(ram.cltp == CLT_ENTRIES_MAX)
trapout(CLT_OVERFLOW);
break;
}
ram.CM = 0; /* unset compilation mode flag */
}
continue;
@@ -318,17 +341,28 @@ void equi_main_loop() {
ram.II = 1; /* raise II flag */
break;
case INS_CMSTART: /* compilation start */
ram.cbp = ram.pc + 1; /* save CBP */
ram.CM = 1; /* raise CM flag */
ram.cbp = ram.pc + 1U; /* save CBP */
ram.CM = 1U; /* raise CM flag */
break;
case INS_QUIT: /* gracefully quit the interpretation mode */
goto brx;
case INS_LITINT: /* literal stack -> main stack as short */
pushLitVal(1);
pushLitVal(1U);
break;
case INS_LITSTR:
break;
case INS_LITCALL:
case INS_LITCALL: /* call the saved word from the literal */
if(ram.lsp < CLT_ENTRY_LEN)
trapout(STACK_UNDERFLOW);
lhash = crc16(&ram.literal_stack[ram.lsp-CLT_ENTRY_LEN], CLT_ENTRY_LEN);
for(pbuf=0;pbuf<CLT_ENTRIES_MAX;++pbuf)
if(ram.clt[pbuf].nhash == lhash) {
ram.pc = ram.clt[pbuf].loc;
break;
}
if(pbuf >= CLT_ENTRIES_MAX)
trapout(INVALID_WORD);
ram.lsp = 0; /* clear the literal stack */
break;
case INS_RET:
ram.pc = popRet();
@@ -421,7 +455,7 @@ int main(int argc, char* argv[]) {
ram.cmd_size = CMD_BUF_SIZE;
ram.II = ram.CM = ram.IM = 0; /* reset all flags */
/* Start both execution and input buffering from the start of command buffer (-1 because we use prefix increment) */
ram.pc = ram.ibp = ram.cmd_start-1;
ram.pc = ram.ibp = 65535U;
printf("Welcome to Equi v" EQUI_VER " by Luxferre, 2022\n\nCLT: 0x%X (%d bytes)\nGPD: 0x%X (%d bytes)\nCommand buffer: 0x%X (%d bytes)\nEqui ready\n\n",
(uchar *)&ram.clt - (uchar *)&ram.main_stack,