Rewrote hello world to not use the stack
This commit is contained in:
parent
a693d4ef90
commit
89952e8112
31
README.md
31
README.md
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@ -58,40 +58,43 @@ evaluxn(u, u->vframe); /* Each frame
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- `+21 -03 MULS`, signed operators have the cond flag `S`.
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```
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( comment )
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:dev/w fff9 ( const write port )
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;i 1 ( var iterator )
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|0100 @RESET
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#00 ,dev/w STR ( set dev/write to console )
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@word1 "hello_world ( len: 0x0b )
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|0100 @RESET
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#00 ,dev/w STR ( set dev/write to console )
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,string ( add string pointer to stack )
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@loop
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IOW ( write to device#0 )
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,i LDR #01 ADD ,i STR ( increment itr )
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,i LDR ( a = i )
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,word1 ,strlen JSR ( b = string length )
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NEQ ,loop ROT JSR? POP^ ( a != b ? loop )
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DUP2 LDR IOW ( write pointer value to console )
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#0001 ADD2 ( increment string pointer )
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DUP2 LDR #00 NEQ ,loop ROT JMP? POP2 ( while *ptr!=0 goto loop )
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BRK
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@strlen #0001 ADD2 LDR RTS
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@string " Hello World " ( add string to memory )
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|c000 @FRAME BRK
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|c000 @FRAME BRK
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|d000 @ERROR BRK
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|FFFA .RESET .FRAME .ERROR
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```
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## TODOs
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- Li1 short mode
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- Defines?
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- LDR/STR helpers
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- Keyboard example
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- PPU chr device
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- Line routine
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- On-screen debugger.
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- Auto-advance ldr?
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- Getting rid of IOR/IOW would be nice..
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- Sending from the wst to the rst, balance mode/flag?
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- Device that works like an extra memory bank
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- Draw a chr sprite.
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- [debug]Print unused labels
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## Refs
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83
assembler.c
83
assembler.c
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@ -33,7 +33,7 @@ Program p;
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/* clang-format off */
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char ops[][4] = {
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"BRK", "NOP", "LI1", "LIX", "IOR", "IOW", "LDR", "STR",
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"BRK", "NOP", "LIT", "LIX", "IOR", "IOW", "LDR", "STR",
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"JMP", "JSR", "RTI", "RTS", "---", "---", "---", "---",
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"POP", "DUP", "SWP", "OVR", "ROT", "AND", "ORA", "ROL",
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"ADD", "SUB", "MUL", "DIV", "EQU", "NEQ", "GTH", "LTH"
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@ -43,7 +43,6 @@ int scmp(char *a, char *b) { int i = 0; while(a[i] == b[i]) if(!a[i++]) return 1
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int slen(char *s) { int i = 0; while(s[i] && s[++i]) ; return i; } /* string length */
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int sihx(char *s) { int i = 0; char c; while((c = s[i++])) if(!(c >= '0' && c <= '9') && !(c >= 'a' && c <= 'f') && !(c >= 'A' && c <= 'F')) return 0; return 1; } /* string is hexadecimal */
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int shex(char *s) { int n = 0, i = 0; char c; while((c = s[i++])) if(c >= '0' && c <= '9') n = n * 16 + (c - '0'); else if(c >= 'A' && c <= 'F') n = n * 16 + 10 + (c - 'A'); else if(c >= 'a' && c <= 'f') n = n * 16 + 10 + (c - 'a'); return n; } /* string to num */
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int cmnt(char *w, int *skip) { if(w[0] == ')') { *skip = 0; return 1; } if(w[0] == '(') *skip = 1; if(*skip) return 1; return 0; } /* comment helper */
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char *scpy(char *src, char *dst, int len) { int i = 0; while((dst[i] = src[i]) && i < len - 2) i++; dst[i + 1] = '\0'; return dst; } /* string copy */
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#pragma mark - Helpers
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@ -63,24 +62,12 @@ pushbyte(Uint8 b, int lit)
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void
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pushshort(Uint16 s, int lit)
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{
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if(lit) {
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pushbyte(0x03, 0);
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pushbyte(0x02, 0);
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}
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if(lit)
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pushbyte(0x22, 0);
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pushbyte((s >> 8) & 0xff, 0);
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pushbyte(s & 0xff, 0);
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}
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void
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pushtext(char *w)
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{
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int i = slen(w);
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pushbyte(0x03, 0);
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pushbyte(slen(w), 0);
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while(i > 0)
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pushbyte(w[--i], 0);
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}
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Label *
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findlabel(char *s)
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{
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@ -156,15 +143,62 @@ makevariable(char *id, Uint16 *addr, FILE *f)
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return makelabel(id, origin);
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}
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int
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skipcomment(char *w, int *cap)
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{
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if(w[0] == ')') {
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*cap = 0;
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return 1;
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}
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if(w[0] == '(') *cap = 1;
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if(*cap) return 1;
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return 0;
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}
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int
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skipstring(char *w, int *cap, Uint16 *addr)
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{
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if(w[0] == '"') {
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if(*cap)
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*addr += 1;
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*cap = !(*cap);
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return 1;
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}
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if(*cap) {
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*addr += slen(w) + 1;
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return 1;
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}
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return 0;
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}
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int
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capturestring(char *w, int *cap)
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{
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if(w[0] == '"') {
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if(*cap)
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pushbyte(0x00, 0);
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*cap = !(*cap);
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return 1;
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}
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if(*cap) {
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int i;
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for(i = 0; i < slen(w); ++i)
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pushbyte(w[i], 0);
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pushbyte(' ', 0);
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return 1;
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}
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return 0;
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}
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int
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pass1(FILE *f)
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{
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int skip = 0;
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int ccmnt = 0, cstrg = 0;
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Uint16 addr = 0;
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char w[64];
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while(fscanf(f, "%s", w) == 1) {
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if(cmnt(w, &skip))
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continue;
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if(skipcomment(w, &ccmnt)) continue;
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if(skipstring(w, &cstrg, &addr)) continue;
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if(w[0] == '@') {
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if(!makelabel(w + 1, addr))
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return error("Pass1 failed", w);
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@ -179,12 +213,11 @@ pass1(FILE *f)
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else {
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switch(w[0]) {
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case '|': addr = shex(w + 1); break;
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case '"': addr += slen(w + 1) + 2; break;
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case '.': addr += 2; break;
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case ',': addr += 4; break;
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case ',': addr += 3; break;
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case '+': /* signed positive */
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case '-': /* signed negative */
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case '#': addr += (slen(w + 1) == 2 ? 2 : 4); break;
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case '#': addr += (slen(w + 1) == 2 ? 2 : 3); break;
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default: return error("Unknown label in first pass", w);
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}
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}
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@ -196,13 +229,14 @@ pass1(FILE *f)
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int
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pass2(FILE *f)
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{
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int skip = 0;
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int ccmnt = 0, cstrg = 0;
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char w[64];
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while(fscanf(f, "%s", w) == 1) {
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Uint8 op = 0;
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Label *l;
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if(w[0] == '@') continue;
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if(cmnt(w, &skip)) continue;
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if(skipcomment(w, &ccmnt)) continue;
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if(capturestring(w, &cstrg)) continue;
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/* clang-format off */
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if(w[0] == '|') p.ptr = shex(w + 1);
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else if((op = findopcode(w)) || scmp(w, "BRK")) pushbyte(op, 0);
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@ -214,7 +248,6 @@ pass2(FILE *f)
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else if(w[0] == '+' && sihx(w + 1) && slen(w + 1) == 4) pushshort((Sint16)shex(w + 1), 1);
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else if(w[0] == '-' && sihx(w + 1) && slen(w + 1) == 2) pushbyte((Sint8)(shex(w + 1) * -1), 1);
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else if(w[0] == '-' && sihx(w + 1) && slen(w + 1) == 4) pushshort((Sint16)(shex(w + 1) * -1), 1);
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else if(w[0] == '"') pushtext(w + 1);
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else if((l = findlabel(w + 1))) pushshort(l->addr, w[0] == ',');
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else return error("Unknown label in second pass", w);
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/* clang-format on */
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@ -9,51 +9,35 @@
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|0100 @RESET
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( set dev/write to screen )
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,01 ,dev/w STR
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#01 ,dev/w STR
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,01 ,color STR
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#01 ,color STR
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( fill rect x y w h )
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,0020 ,0020 ,0060 ,0040 ,fillrect JSR
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#0020 #0020 #0060 #0040 ,fillrect JSR
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,02 ,color STR
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#02 ,color STR
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( fill rect x y w h )
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,0030 ,0030 ,0040 ,0060 ,fillrect JSR
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#0030 #0030 #0040 #0060 ,fillrect JSR
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,03 ,color STR
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#03 ,color STR
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( fill rect x y w h )
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,0040 ,0040 ,0060 ,0040 ,fillrect JSR
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#0040 #0040 #0060 #0040 ,fillrect JSR
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,01 ,color STR
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#01 ,color STR
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( fill rect x y w h )
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,00a0 ,0010 ,0020 ,0020 ,fillrect JSR
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#00a0 #0010 #0020 #0020 ,fillrect JSR
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,02 ,color STR
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#02 ,color STR
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( fill rect x y w h )
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,00b0 ,0040 ,0020 ,0020 ,linerect JSR
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#00b0 #0040 #0020 #0020 ,linerect JSR
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,03 ,color STR
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#03 ,color STR
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( fill rect x y w h )
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,0058 ,0028 ,0050 ,0050 ,linerect JSR
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#0058 #0028 #0050 #0050 ,linerect JSR
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,01 ,color STR
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#01 ,color STR
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( fill rect x y w h )
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,0028 ,0038 ,0050 ,0030 ,linerect JSR
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( positive )
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,01 ,color STR
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+0030 ,x0 STR2 +0040 ,y0 STR2
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+0100 ,x1 STR2 +0060 ,y1 STR2
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,line JSR
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,02 ,color STR
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+0020 ,x0 STR2 +0010 ,y0 STR2
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+0090 ,x1 STR2 +0070 ,y1 STR2
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,line JSR
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,03 ,color STR
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+0010 ,x0 STR2 +0040 ,y0 STR2
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+0070 ,x1 STR2 +0060 ,y1 STR2
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,line JSR
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#0028 #0038 #0050 #0030 ,linerect JSR
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,redraw JSR
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@ -66,9 +50,9 @@ BRK
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,x LDR2 ,x_ STR2
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@fillrectcol
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( draw ) ,x_ LDR2 ,y_ LDR2 ,putpixel JSR
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,x_ LDR2 ,0001 ADD2 ,x_ STR2
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,x_ LDR2 #0001 ADD2 ,x_ STR2
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,x_ LDR2 ,w LDR2 ,x LDR2 ADD2 LTH2 ,fillrectcol ROT JMP? POP2
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,y_ LDR2 ,0001 ADD2 ,y_ STR2
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,y_ LDR2 #0001 ADD2 ,y_ STR2
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,y_ LDR2 ,h LDR2 ,y LDR2 ADD2 LTH2 ,fillrectrow ROT JMP? POP2
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RTS
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@ -78,33 +62,13 @@ BRK
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@linerectcol
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( draw ) ,x LDR2 ,y_ LDR2 ,putpixel JSR
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( draw ) ,x LDR2 ,w LDR2 ADD2 ,y_ LDR2 ,putpixel JSR
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,y_ LDR2 ,0001 ADD2 ,y_ STR2
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,y_ LDR2 #0001 ADD2 ,y_ STR2
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,y_ LDR2 ,h LDR2 ,y LDR2 ADD2 LTH2 ,linerectcol ROT JMP? POP2
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@linerectrow
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( draw ) ,x_ LDR2 ,y LDR2 ,putpixel JSR
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( draw ) ,x_ LDR2 ,y LDR2 ,h LDR2 ADD2 ,putpixel JSR
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,x_ LDR2 ,0001 ADD2 ,x_ STR2
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,x_ LDR2 ,w LDR2 ,x LDR2 ADD2 ,0001 ADD2 LTH2 ,linerectrow ROT JMP? POP2
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RTS
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@line
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,x0 LDR2 ,x_ STR2 ,y0 LDR2 ,y_ STR2 ( start at x0,y0 )
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,x1 LDR2 ,x0 LDR2 ,diff16sub JSR ,dx STR2 ( int dx = abs[x1 - x0] )
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,y1 LDR2 ,y0 LDR2 ,diff16sub JSR -0001 MULS2 ,dy STR2 ( int dy = -abs[y1 - y0] )
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,dx LDR2 ,dy LDR2 ADDS2 ,err1 STR2 ( int err1 = dx + dy, e2; )
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@lineloop
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,x_ LDR2 ,y_ LDR2 ,putpixel JSR ( draw )
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@line-x
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,err1 LDR2 +0002 MULS2 ,err2 STR2 ( e2 = 2 * err; )
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,err2 LDR2 ,dy LDR2 LTHS2 ,line-y ROT JMP? POP2 ( e2 >= dy )
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,err1 LDR2 ,dy LDR2 ADDS2 ,err1 STR2 ( err1 += dy; )
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,x_ LDR2 +0001 ADDS2 ,x_ STR2 ( y0 += y0 < y1 ? 1 : -1; )
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@line-y
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,err2 LDR2 ,dx LDR2 GTHS2 ,line-end ROT JMP? POP2 ( e2 <= dx )
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,err1 LDR2 ,dx LDR2 ADDS2 ,err1 STR2 ( err1 += dx; )
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,y_ LDR2 +0001 ADDS2 ,y_ STR2 ( y0 += y0 < y1 ? 1 : -1; )
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@line-end
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,x_ LDR2 ,x1 LDR2 NEQS2 ,lineloop ROT JMP? POP2 ( loop )
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,x_ LDR2 #0001 ADD2 ,x_ STR2
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,x_ LDR2 ,w LDR2 ,x LDR2 ADD2 #0001 ADD2 LTH2 ,linerectrow ROT JMP? POP2
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RTS
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@diff16
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@ -113,17 +77,17 @@ BRK
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RTS
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@redraw
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,0000 IOW2
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,0000 IOW2
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,00 IOW
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,01 IOW
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#0000 IOW2
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#0000 IOW2
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#00 IOW
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#01 IOW
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RTS
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@putpixel
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IOW2 ( y short )
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IOW2 ( x short )
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,color LDR IOW ( color byte )
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,00 IOW ( redraw byte )
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#00 IOW ( redraw byte )
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RTS
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|c000 @FRAME BRK
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@ -1,25 +1,21 @@
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( hello world, to console )
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( comment )
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:dev/w fff9 ( const write port )
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;i 1 ( var iterator )
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|0100 @RESET
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#00 ,dev/w STR ( set dev/write to console )
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@word1 "hello_world ( len: 0x0b )
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|0100 @RESET
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#00 ,dev/w STR ( set dev/write to console )
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,string ( add string pointer to stack )
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@loop
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IOW ( write to device#0 )
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,i LDR #01 ADD ,i STR ( increment itr )
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,i LDR ( a = i )
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,word1 ,strlen JSR ( b = string length )
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NEQ ,loop ROT JSR? POP^ ( a != b ? loop )
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DUP2 LDR IOW ( write pointer value to console )
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#0001 ADD2 ( increment string pointer )
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DUP2 LDR #00 NEQ ,loop ROT JMP? POP2 ( while *ptr!=0 goto loop )
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BRK
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@strlen #0001 ADD2 LDR RTS
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@string " Hello World " ( add string to memory )
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|c000 @FRAME BRK
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|c000 @FRAME BRK
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|d000 @ERROR BRK
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|FFFA .RESET .FRAME .ERROR
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@ -1,16 +1,21 @@
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( comment )
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:const abcd
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;byte 1
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;short 2
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:dev/w fff9 ( const write port )
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|0100 @RESET
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12 34 ADD
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1234 0001 ADD2
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#00 ,dev/w STR ( set dev/write to console )
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,string ( add string pointer to stack )
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@loop
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DUP2 LDR IOW ( write pointer value to console )
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#0001 ADD2 ( increment string pointer )
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DUP2 LDR #00 NEQ ,loop ROT JMP? POP2 ( while *ptr!=0 goto loop )
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BRK
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@string " Hello World " ( add string to memory )
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|c000 @FRAME BRK
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|d000 @ERROR BRK
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|FFFA .RESET .FRAME .ERROR
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7
uxn.c
7
uxn.c
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@ -31,7 +31,7 @@ Uint16 pop16(St8 *s) { return pop8(s) + (pop8(s) << 8); }
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Uint16 peek16(St8 *s, Uint8 a) { return peek8(s, a * 2) + (peek8(s, a * 2 + 1) << 8); }
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/* I/O */
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void op_brk(Uxn *u) { setflag(&u->status,FLAG_HALT, 1); }
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void op_li1(Uxn *u) { u->literal += 1; }
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void op_lit(Uxn *u) { u->literal += 1; }
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void op_lix(Uxn *u) { u->literal += u->ram.dat[u->ram.ptr++]; }
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void op_nop(Uxn *u) { printf("0x%02x ", pop8(&u->wst)); }
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void op_ior(Uxn *u) { Device *dev = &u->dev[mempeek8(&u->ram, u->devr)]; if(dev) push8(&u->wst, dev->read(dev, pop8(&u->wst))); }
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@ -61,6 +61,7 @@ void op_neq(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst,
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void op_gth(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint8)b > (Sint8)a : b > a); }
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void op_lth(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint8)b < (Sint8)a : b < a); }
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/* --- */
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||||
void op_lit16(Uxn *u) { u->literal += 2; }
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void op_nop16(Uxn *u) { printf("%04x\n", pop16(&u->wst)); }
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void op_ior16(Uxn *u) { Uint8 a = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devr)]; if(dev) push16(&u->wst, (dev->read(dev, a) << 8) + dev->read(dev, a + 1)); }
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void op_iow16(Uxn *u) { Uint8 a = pop8(&u->wst); Uint8 b = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devw)]; if(dev) { dev->write(dev, b); dev->write(dev, a); } }
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@ -86,12 +87,12 @@ void op_gth16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push8(&u-
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void op_lth16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint16)b < (Sint16)a : b < a); }
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||||
void (*ops[])(Uxn *u) = {
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||||
op_brk, op_nop, op_li1, op_lix, op_ior, op_iow, op_ldr, op_str,
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||||
op_brk, op_nop, op_lit, op_lix, op_ior, op_iow, op_ldr, op_str,
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||||
op_jmp, op_jsr, op_nop, op_rts, op_nop, op_nop, op_nop, op_nop,
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op_pop, op_dup, op_swp, op_ovr, op_rot, op_and, op_ora, op_rol,
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||||
op_add, op_sub, op_mul, op_div, op_equ, op_neq, op_gth, op_lth,
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||||
/* 16-bit */
|
||||
op_brk, op_nop16, op_li1, op_lix, op_ior16, op_iow16, op_ldr16, op_str16,
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||||
op_brk, op_nop16, op_lit16, op_lix, op_ior16, op_iow16, op_ldr16, op_str16,
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||||
op_jmp, op_jsr, op_nop, op_rts, op_nop, op_nop, op_nop, op_nop,
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||||
op_pop16, op_dup16, op_swp16, op_ovr16, op_rot16, op_and16, op_ora16, op_rol16,
|
||||
op_add16, op_sub16, op_mul16, op_div16, op_equ16, op_neq16, op_gth16, op_lth16
|
||||
|
|
Loading…
Reference in New Issue