Add support for interrupting Uxn during execution.

projects/library/debugger.tal

@@ -22,7 +22,7 @@ The debugger will catch stack errors that arise after that point.
 
 @debug ( pc* -- )
 	#0001 SUB2 .System/eaddr DEO2
-	.System/ecode DEIk #f8 AND #06 EOR SWP DEO
+	.System/ecode DEIk #07 EOR SWP DEO
 	,debug-vector/main JMP
 
 @debug-vector ( -> )
@@ -126,18 +126,19 @@ The debugger will catch stack errors that arise after that point.
 		:&rst-msg :&overflow-msg
 		:&wst-msg :&divzero-msg
 		:&rst-msg :&divzero-msg
+		:&emulator-msg :&interrupt-msg
 		:&userdef-msg :&breakpoint-msg
-		:&userdef-msg :&custom-msg
 
 	&halted-msg "Halted: 2000 ( #0002, at 0x0100 )
 	&wst-msg "Working-stack 2000
 	&rst-msg "Return-stack 2000
+	&emulator-msg "Emulator 2000
 	&userdef-msg "User-defined 2000
 	&underflow-msg "underflow 00
 	&overflow-msg "overflow 00
 	&divzero-msg "division 20 "by 20 "zero 00
+	&interrupt-msg "interrupt 00
 	&breakpoint-msg "breakpoint 00
-	&custom-msg "custom 20 "error 00
 	&executing-msg 20 "executing 2000
 	&at-msg 20 "at 20 "0x 00
 	&contents-msg "contents: 00

src/uxn.c

@@ -29,12 +29,12 @@ WITH REGARD TO THIS SOFTWARE.
 #define DEVR(o, d, x) { dev = (d); o = dev->dei(dev, (x) & 0x0f); if(bs) { o = (o << 8) + dev->dei(dev, ((x) + 1) & 0x0f); } }
 #define DEVW8(x, y) { dev->dat[(x) & 0xf] = y; dev->deo(dev, (x) & 0x0f); }
 #define DEVW(d, x, y) { dev = (d); if(bs) { DEVW8((x), (y) >> 8); DEVW8((x) + 1, (y)); } else { DEVW8((x), (y)) } }
-#define WARP(x) { if(bs) pc = (x); else pc += (Sint8)(x); }
 
 int
 uxn_eval(Uxn *u, Uint16 pc)
 {
 	unsigned int a, b, c, j, k, bs, instr, errcode;
+	Uint16 warp_count = 0;
 	Uint8 kptr, *sp;
 	Stack *src, *dst;
 	Device *dev;
@@ -72,9 +72,9 @@ uxn_eval(Uxn *u, Uint16 pc)
 		case 0x09: /* NEQ */ POP(a) POP(b) PUSH8(src, b != a) break;
 		case 0x0a: /* GTH */ POP(a) POP(b) PUSH8(src, b > a) break;
 		case 0x0b: /* LTH */ POP(a) POP(b) PUSH8(src, b < a) break;
-		case 0x0c: /* JMP */ POP(a) WARP(a) break;
+		case 0x0c: /* JMP */ POP(a) goto warp;
-		case 0x0d: /* JCN */ POP(a) POP8(b) if(b) WARP(a) break;
+		case 0x0d: /* JCN */ POP(a) POP8(b) if(b) goto warp; break;
-		case 0x0e: /* JSR */ POP(a) PUSH16(dst, pc) WARP(a) break;
+		case 0x0e: /* JSR */ POP(a) PUSH16(dst, pc) goto warp;
 		case 0x0f: /* STH */ POP(a) PUSH(dst, a) break;
 		/* Memory */
 		case 0x10: /* LDZ */ POP8(a) PEEK(b, a) PUSH(src, b) break;
@@ -95,6 +95,11 @@ uxn_eval(Uxn *u, Uint16 pc)
 		case 0x1e: /* EOR */ POP(a) POP(b) PUSH(src, b ^ a) break;
 		case 0x1f: /* SFT */ POP8(a) POP(b) c = b >> (a & 0x0f) << ((a & 0xf0) >> 4); PUSH(src, c) break;
 		}
+		continue;
+
+		warp:
+		if(bs) pc = a; else pc += (Sint8)(a);
+		if(!++warp_count && uxn_interrupt(u)) return uxn_halt(u, 6, pc - 1);
 	}
 	return 1;
 

src/uxn.h

@@ -51,4 +51,5 @@ typedef struct Uxn {
 int uxn_boot(Uxn *u, Uint8 *ram, Uint8 *devices, Stack *wst, Stack *rst);
 int uxn_eval(Uxn *u, Uint16 pc);
 int uxn_halt(Uxn *u, Uint8 error, Uint16 addr);
+int uxn_interrupt(Uxn *u);
 Device *uxn_port(Uxn *u, Uint8 id, Uint8 (*deifn)(Device *, Uint8), void (*deofn)(Device *, Uint8));

src/uxncli.c

@@ -20,6 +20,12 @@ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE.
 */
 
+int
+uxn_interrupt(Uxn *u)
+{
+	return 0;
+}
+
 static int
 error(char *msg, const char *err)
 {

src/uxnemu.c

@@ -84,6 +84,12 @@ audio_finished_handler(UxnAudio *c)
 	SDL_PushEvent(&event);
 }
 
+int
+uxn_interrupt(Uxn *u)
+{
+	return 0;
+}
+
 static int
 stdin_handler(void *p)
 {