*

README.md

@@ -8,34 +8,29 @@ A stack-based VM, written in ANSI C.
 cc uxn.c -std=c89 -Os -DNDEBUG -g0 -s -Wall -Wno-unknown-pragmas -o uxn
 ```
 
-## OP Codes
+## Assembly Syntax
 
 ```
-VALUE       OPCODE  EXPLANATION
+: 	starting a definition
-0x00000000  NOP     do nothing
+& 	obtaining pointers
-0x00000001  ADD     pop a, pop b, push a + b
+( 	stack comments
-0x00000002  SUB     pop a, pop b, push a - b
+` 	inlining bytecodes
-0x00000003  AND     pop a, pop b, push a & b
+' 	strings
-0x00000004  OR      pop a, pop b, push a | b
+# 	numbers
-0x00000005  XOR     pop a, pop b, push a ^ b
+$ 	characters
-0x00000006  NOT     pop a, push !a
+~   vector
-0x00000007  IN      read one byte from stdin, push as word on stack
+[ 12 34 ] real values
-0x00000008  OUT     pop one word and write to stream as one byte
+< 12 34 > relative values
-0x00000009  LOAD    pop a, push word read from address a
+( 12 34 ) deadzone
-0x0000000A  STOR    pop a, pop b, write b to address a
+```
-0x0000000B  JMP     pop a, goto a
+
-0x0000000C  JZ      pop a, pop b, if a == 0 goto b
+```
-0x0000000D  PUSH    push next word
+;add-two JSR
-0x0000000E  DUP     duplicate word on stack
+
-0x0000000F  SWAP    swap top two words on stack
+BRK
-0x00000010  ROL3    rotate top three words on stack once left, (a b c) -> (b c a)
+
-0x00000011  OUTNUM  pop one word and write to stream as number
+:add-two
-0x00000012  JNZ     pop a, pop b, if a != 0 goto b
+	[ 2 ] ADD RTS
-0x00000013  DROP    remove top of stack
-0x00000014  PUSHIP  push a in IP stack
-0x00000015  POPIP   pop IP stack to current IP, effectively performing a jump
-0x00000016  DROPIP  pop IP, but do not jump
-0x00000017  COMPL   pop a, push the complement of a
 ```
 
 ## Design
@@ -50,12 +45,11 @@ VALUE       OPCODE  EXPLANATION
 
 ### Assembly
 
-- `%25`, decimal
+#### Addressing 
-- `#25`, hex
 
-```
+- `label`, a named offset[TODO]
-2 2 + $ef
+- `literal`, a numeric value
-```
+- `pointer`, pointer to an address[TODO]
 
 ### Assembler
 

build.sh

@@ -10,14 +10,14 @@ rm -f ./uxn
 
 # debug(slow)
 cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxnasm.c -o uxnasm
-cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxn.c -o uxn
+# cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxn.c -o uxn
 
 # build(fast)
 # cc uxn.c -std=c89 -Os -DNDEBUG -g0 -s -Wall -Wno-unknown-pragmas -o uxn
 
 # Size
-echo "Size: $(du -sk ./uxn)"
+# echo "Size: $(du -sk ./uxn)"
 
 # run
 ./uxnasm program.usm program.rom
-./uxn program.rom
+# ./uxn program.rom

program.usm

@@ -1 +1 @@
-#12 #34 add 
+LIT 25 26 LIT DUP ADD BRK

uxnasm.c

@@ -14,13 +14,14 @@ WITH REGARD TO THIS SOFTWARE.
 #define PRGLEN 256
 
 typedef unsigned char Uint8;
-typedef unsigned short Uint16;
 
 typedef struct {
 	int ptr;
-	Uint16 data[PRGLEN];
+	Uint8 data[PRGLEN];
 } Program;
 
+char opcodes[][4] = {"BRK", "LIT", "DUP", "DRP", "SWP", "SLP", "PSH", "POP", "JMP", "JSR", "RST", "BEQ", "EQU", "NEQ", "LTH", "GTH"};
+
 Program p;
 
 #pragma mark - Helpers
@@ -35,6 +36,16 @@ scmp(char *a, char *b) /* string compare */
 	return 0;
 }
 
+char *
+suca(char *s) /* string to uppercase */
+{
+	int i = 0;
+	char c;
+	while((c = s[i]))
+		s[i++] = c >= 'a' && c <= 'z' ? c - ('a' - 'A') : c;
+	return s;
+}
+
 int
 shex(char *s) /* string to num */
 {
@@ -53,10 +64,27 @@ shex(char *s) /* string to num */
 Uint8
 getopcode(char *s)
 {
-	if(scmp(s, "add")) {
+	int i;
-		return 0x01;
+	for(i = 0; i < 16; ++i)
+		if(scmp(opcodes[i], suca(s)))
+			return i;
+	return 0xff;
+}
+
+void
+echo(Uint8 *s, Uint8 len, Uint8 ptr, char *name)
+{
+	int i;
+	printf("%s\n", name);
+	for(i = 0; i < len; ++i) {
+		if(i % 16 == 0)
+			printf("\n");
+		if(ptr == i)
+			printf("[%02x]", s[i]);
+		else
+			printf(" %02x ", s[i]);
 	}
-	return 0;
+	printf("\n");
 }
 
 void
@@ -64,16 +92,10 @@ pass1(FILE *f)
 {
 	char word[64];
 	while(fscanf(f, "%s", word) == 1) {
-		int lit = 0, val = 0;
+		int op = getopcode(word);
-		if(word[0] == '#') {
+		if(op == 0xff)
-			lit = 0;
+			op = shex(word);
-			val = shex(word + 1);
+		p.data[p.ptr++] = op;
-		} else {
-			lit = 1;
-			val = getopcode(word);
-		}
-		printf("#%d -> %s[%02x %02x]\n", p.ptr, word, lit, val);
-		p.data[p.ptr++] = (val << 8) + (lit & 0xff);
 	}
 }
 
@@ -95,5 +117,6 @@ main(int argc, char *argv[])
 	pass1(f);
 	fwrite(p.data, sizeof(p.data), 1, fopen(argv[2], "wb"));
 	fclose(f);
+	echo(p.data, 0x40, 0, "program");
 	return 0;
 }