1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "vm.h"
#include "ast.h"
#include "read.h"
#include "state.h"
static void compile_node(State *S, Chunk *ch, AstNode a) {
switch (a.ty) {
case AST_IDENT:
printf("can't compile ident\n");
exit(1);
break;
case AST_NUM:
chunk_wbc(S, ch, OP_LOADK);
chunk_wbc(S, ch, chunk_wconst(S, ch, VAL_NUM(a.as.num)));
break;
case AST_STRING: {
size_t len = strlen(a.as.str);
ObjString *o = objstring_copy(S, a.as.str, len);
chunk_wbc(S, ch, OP_LOADK);
chunk_wbc(S, ch, chunk_wconst(S, ch, VAL_OBJ(o)));
break;
}
case AST_LIST: {
AstVec l = a.as.list;
#define CK(cond, msg) if (!(cond)) { puts(msg); exit(1); }
CK(l.len == 3, "can only compile binary ops");
CK(l.vals[0].ty == AST_IDENT, "can only call ops");
#undef CK
char opchar = l.vals[0].as.str[0];
Op op;
switch (opchar) {
#define OP(char, code) case char: op = code; break;
OP('+', OP_ADD)
OP('-', OP_SUB)
OP('*', OP_MUL)
OP('/', OP_DIV)
#undef OP
default:
printf("unkown op %s\n",l.vals[0].as.str);
exit(1);
break;
}
compile_node(S, ch, l.vals[1]);
compile_node(S, ch, l.vals[2]);
chunk_wbc(S, ch, op);
}
}
}
int main() {
State st = state_new();
State *S = &st;
Thread th = thread_new(S);
st.th = &th;
Chunk ch = chunk_new(S);
th.ch = &ch;
AstNode an = read();
compile_node(S, &ch, an);
chunk_wbc(S, &ch, OP_PRINT);
chunk_wbc(S, &ch, OP_RET);
runvm(S);
}
|
