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
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
import std.stdio;
import std.string;
import chunk;
import parser;
//import parser;
//import dbg;
//import value;
void printForm(Form f, string prefix = "") {
switch (f.type) {
case FormType.EOF:
writeln("eof");
return;
case FormType.ATOM:
writefln("%s atom: %s", prefix, atomAsString(cast(Atom)f));
break;
case FormType.CONS:
Cons c = cast(Cons)f;
writef("%s cons <", prefix);
if (c.evaluate) {
writeln("true>");
} else {
writeln("false>");
}
printForm(c.head, format("%s>", prefix));
foreach (Form i ; c.tail) {
printForm(i, format("%s>", prefix));
}
break;
case FormType.NIL:
writefln("%s NIL", prefix);
break;
case FormType.PARSE_ERROR:
ParseError pe = cast(ParseError)f;
writefln("ERROR: %s", pe.message);
break;
case FormType.SYMBOL:
Symbol s = cast(Symbol)f;
writefln("%s sym: %s", prefix, s.name);
break;
case FormType.FUNC:
Func func = cast(Func)f;
writefln("%s <fn %s>", prefix, func.name.name);
printForm(func.args, format("%s -", prefix));
writefln("%s with %d body lines", prefix, func.funcBody.length);
writefln("%s <end fn %s>", prefix, func.name.name);
break;
case FormType.DEF:
Def def = cast(Def)f;
writefln("%s var: %s", prefix, def.name.name);
break;
case FormType.BLOCK:
Block block = cast(Block)f;
writefln("%s block of %d", prefix, block.blockBody.length);
break;
default:
writeln("printFormDefault");
break;
}
}
string printableValue(Value val) {
switch (val.type) {
case ValueType.STRING:
return val.as.str;
case ValueType.NUMBER:
return format("%g", val.as.number);
case ValueType.BOOLEAN:
if (val.as.boolean) {
return "true";
} else {
return "false";
}
default:
return "! unknown value type !";
}
}
string atomAsString(Atom a) {
return printableValue(a.value);
}
int byteInstruction(string message, Chunk chunk, int offset) {
ubyte slot = chunk.code[offset + 1];
writefln("%-16s %4d", message, slot);
return offset + 2;
}
int constantInstruction(string message, Chunk chunk, int offset) {
ubyte idx = chunk.code[offset + 1];
//writeln("dunno how to write a constant");
writefln("%-16s %4d '%s'", message, idx, printableValue(chunk.constants[idx]));
//writefln("%-16s %4d '%s'", message, idx, atomAsString(chunk.constants[idx]));
return offset + 2;
}
int simpleInstruction(string message, int offset) {
writeln(message);
return offset + 1;
}
int disassemble(Chunk chunk, int offset) {
writef("%04d %4d ", offset, chunk.lines[offset]);
ubyte inst = chunk.code[offset];
switch (inst) {
case OpCode.OP_GET_LOCAL:
return byteInstruction("OP_GET_LOCAL", chunk, offset);
case OpCode.OP_SET_LOCAL:
return byteInstruction("OP_SET_LOCAL", chunk, offset);
case OpCode.OP_ADD:
return simpleInstruction("OP_ADD", offset);
case OpCode.OP_LESS:
return simpleInstruction("OP_LESS", offset);
case OpCode.OP_SUBTRACT:
return simpleInstruction("OP_SUBTRACT", offset);
case OpCode.OP_CONSTANT:
return constantInstruction("OP_CONSTANT", chunk, offset);
case OpCode.OP_DEFINE_GLOBAL:
return constantInstruction("OP_DEFINE_GLOBAL", chunk, offset);
case OpCode.OP_NEGATE:
return simpleInstruction("OP_NEGATE", offset);
case OpCode.OP_POP:
return simpleInstruction("OP_POP", offset);
case OpCode.OP_POP_SCOPE:
return simpleInstruction("OP_POP_SCOPE", offset);
case OpCode.OP_RETURN:
return simpleInstruction("OP_RETURN", offset);
case OpCode.OP_NIL:
return simpleInstruction("OP_NIL", offset);
default:
writeln("unknown opcode?");
return offset + 1;
}
return 0;
}
|
