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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
use crate::evm::{Evm, Stack, Stepper};
use crate::ll::{Instruction, Instruction::*};
use crate::util::{
w256, Bottom, Concretizable, IsBottom, JoinInto, JoinLattice, JoinSemiLattice, Top,
};
impl<'a, S: Stack + Clone + JoinSemiLattice> JoinInto for Evm<'a, S> {
fn join_into(&mut self, other: &Self) -> bool {
if other.is_bottom() {
false
} else if self.is_bottom() {
*self = (*other).clone();
true } else {
assert_eq!(self.pc, other.pc); self.stack.join_into(&other.stack)
}
}
}
impl<'a, S: Stack + JoinSemiLattice> Bottom for Evm<'a, S> {
const BOTTOM: Evm<'a, S> = Evm::new_const(&[], S::BOTTOM);
}
impl<'a, S: Stack + Clone + JoinSemiLattice> Stepper for Evm<'a, S>
where
S::Word: JoinLattice + Concretizable<Item = w256>,
{
type Result = (Evm<'a, S>, Evm<'a, S>);
fn step(mut self) -> Self::Result {
let insn = Instruction::decode(self.pc, &self.code);
self = self.next(1);
let st = match insn {
STOP => Self::BOTTOM,
ADD | MUL | SUB | DIV | SDIV | MOD | SMOD | EXP | SIGNEXTEND => {
self.pop(2).push(S::Word::TOP)
}
ADDMOD | MULMOD => self.pop(3).push(S::Word::TOP),
ISZERO | NOT => self.pop(1).push(S::Word::TOP),
LT | GT | SLT | SGT | EQ => self.pop(2).push(S::Word::TOP),
AND | OR | XOR | BYTE | SHL | SHR | SAR => self.pop(2).push(S::Word::TOP),
KECCAK256 => {
self.pop(2).push(S::Word::TOP)
}
ADDRESS => self.push(S::Word::TOP),
BALANCE => self.pop(1).push(S::Word::TOP),
ORIGIN => self.push(S::Word::TOP),
CALLER => self.push(S::Word::TOP),
CALLVALUE => self.push(S::Word::TOP),
CALLDATALOAD => self.pop(1).push(S::Word::TOP),
CALLDATASIZE => self.push(S::Word::TOP),
CALLDATACOPY => self.pop(3),
CODESIZE => self.push(S::Word::TOP),
CODECOPY => self.pop(3),
GASPRICE => self.push(S::Word::TOP),
EXTCODESIZE => self.pop(1).push(S::Word::TOP),
EXTCODECOPY => self.pop(4),
RETURNDATASIZE => self.push(S::Word::TOP),
RETURNDATACOPY => self.pop(3),
EXTCODEHASH => self.pop(1).push(S::Word::TOP),
BLOCKHASH => self.pop(1).push(S::Word::TOP),
COINBASE => self.push(S::Word::TOP),
TIMESTAMP => self.push(S::Word::TOP),
NUMBER => self.push(S::Word::TOP),
DIFFICULTY => self.push(S::Word::TOP),
GASLIMIT => self.push(S::Word::TOP),
CHAINID => self.push(S::Word::TOP),
SELFBALANCE => self.push(S::Word::TOP),
POP => self.pop(1),
MLOAD => self.pop(1).push(S::Word::TOP),
MSTORE | MSTORE8 => self.pop(2),
SLOAD => self.pop(1).push(S::Word::TOP),
SSTORE => self.pop(2),
PC | MSIZE | GAS => self.push(S::Word::TOP),
JUMPDEST(_) => self, PUSH(bytes) => {
let n = w256::from_be_bytes(&bytes);
self.push(S::Word::from(n)).next(bytes.len())
}
DUP(n) => {
let m = (n - 1) as usize;
let nth = self.peek(m);
self.push(nth)
}
SWAP(n) => {
let m = n as usize;
let x = self.peek(m);
let y = self.peek(0);
self.set(0, x).set(m, y)
}
LOG(n) => self.pop((n + 2) as usize),
CREATE => self.pop(3).push(S::Word::TOP),
CALL | CALLCODE => self.pop(7).push(S::Word::TOP),
DELEGATECALL | STATICCALL => self.pop(6).push(S::Word::TOP),
CREATE2 => self.pop(4).push(S::Word::TOP),
JUMP => {
let target: usize = self.peek(0).constant().into();
return (Evm::BOTTOM, self.pop(1).goto(target));
}
JUMPI => {
let target: usize = self.peek(0).constant().into();
self = self.pop(2);
let other = self.clone();
return (self, other.goto(target));
}
INVALID | RETURN | REVERT => Evm::BOTTOM,
SELFDESTRUCT => self.pop(1),
_ => {
panic!("S::Word::TOP instruction ({:?})", insn);
}
};
(st, Evm::BOTTOM)
}
}