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#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:;
char *ident = a.as.str;
if (0 == strcmp(ident, "true")) chunk_wbc(S, ch, OP_TRUE);
else if (0 == strcmp(ident, "false")) chunk_wbc(S, ch, OP_FALSE);
else if (0 == strcmp(ident, "nil")) chunk_wbc(S, ch, OP_NIL);
else {
// global read
size_t len = strlen(a.as.str);
ObjString *o = objstring_copy(S, a.as.str, len);
chunk_wbc(S, ch, OP_GETGLOBAL);
chunk_wbc(S, ch, chunk_wconst(S, ch, VAL_OBJ(o)));
}
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.vals[0].ty == AST_IDENT, "can only call ops");
if (0 == strcmp(l.vals[0].as.str, "print")) {
CK(l.len == 2, "print requires exactly 1 argument");
compile_node(S, ch, l.vals[1]);
chunk_wbc(S, ch, OP_PRINT);
} else if (0 == strcmp(l.vals[0].as.str, "set")) {
CK(l.len == 3, "set requires exactly 2 arguments");
AstNode ident = l.vals[1];
CK(ident.ty == AST_IDENT, "set's first argument must be identifier");
size_t len = strlen(ident.as.str);
ObjString *o = objstring_copy(S, ident.as.str, len);
compile_node(S, ch, l.vals[2]);
chunk_wbc(S, ch, OP_SETGLOBAL);
chunk_wbc(S, ch, chunk_wconst(S, ch, VAL_OBJ(o)));
} else if (0 == strcmp(l.vals[0].as.str, "do")) {
for (int i = 1; i < l.len - 1; i++) {
compile_node(S, ch, l.vals[i]);
chunk_wbc(S, ch, OP_DROP);
}
compile_node(S, ch, l.vals[l.len - 1]);
} else {
CK(l.len == 3, "can only compile binary ops");
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);
}
#undef CK
}
}
}
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;
char n1[] = "foo";
char n2[] = "bar";
char n3[] = "baz";
ObjString *o1 = objstring_copy(S, n1, 3);
ObjString *o2 = objstring_copy(S, n2, 3);
ObjString *o3 = objstring_copy(S, n3, 3);
ht_put(S, &st.globals, o1, VAL_NUM(69));
ht_put(S, &st.globals, o2, VAL_NUM(2));
ht_put(S, &st.globals, o3, VAL_NUM(3));
AstNode an = read();
compile_node(S, &ch, an);
chunk_wbc(S, &ch, OP_PRINT);
chunk_wbc(S, &ch, OP_RET);
return runvm(S);
}
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