essential-vm 0.13.0

The Essential VM
Documentation 
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

use crate::{
    asm,
    error::{OpError, TotalControlFlowError},
    sync::test_util::test_access,
    utils::EmptyState,
    GasLimit, Op, Vm,
};

#[test]
fn test_jump_if() {
    let access = test_access();
    let ops = &[
        asm::Stack::Push(1).into(),
        asm::Stack::Push(1).into(),
        asm::Alu::Add.into(),
        asm::Stack::Push(3).into(),
        asm::Stack::Push(1).into(),
        asm::TotalControlFlow::JumpIf.into(),
        asm::Stack::Push(1).into(),
        asm::Alu::Add.into(),
        asm::Stack::Push(1).into(),
        asm::Alu::Add.into(),
    ];
    let op_gas_cost = &|_: &Op| 1;
    let mut vm = Vm::default();
    vm.exec_ops(
        ops,
        access.clone(),
        &EmptyState,
        op_gas_cost,
        GasLimit::UNLIMITED,
    )
    .unwrap();
    assert_eq!(&vm.stack[..], &[3]);

    let ops = &[
        asm::Stack::Push(1).into(),
        asm::Stack::Push(1).into(),
        asm::Alu::Add.into(),
        asm::Stack::Push(3).into(),
        asm::Stack::Push(0).into(),
        asm::TotalControlFlow::JumpIf.into(),
        asm::Stack::Push(1).into(),
        asm::Alu::Add.into(),
        asm::Stack::Push(1).into(),
        asm::Alu::Add.into(),
    ];
    let op_gas_cost = &|_: &Op| 1;
    let mut vm = Vm::default();
    vm.exec_ops(
        ops,
        access.clone(),
        &EmptyState,
        op_gas_cost,
        GasLimit::UNLIMITED,
    )
    .unwrap();
    assert_eq!(&vm.stack[..], &[4]);
}

#[test]
fn test_halt_if() {
    let access = test_access();
    let ops = &[
        asm::Stack::Push(1).into(),
        asm::Stack::Push(1).into(),
        asm::Alu::Add.into(),
        asm::Stack::Push(1).into(),
        asm::TotalControlFlow::HaltIf.into(),
        asm::Stack::Push(1).into(),
        asm::Alu::Add.into(),
    ];
    let op_gas_cost = &|_: &Op| 1;
    let mut vm = Vm::default();
    vm.exec_ops(
        ops,
        access.clone(),
        &EmptyState,
        op_gas_cost,
        GasLimit::UNLIMITED,
    )
    .unwrap();
    assert_eq!(&vm.stack[..], &[2]);

    let ops = &[
        asm::Stack::Push(1).into(),
        asm::Stack::Push(1).into(),
        asm::Alu::Add.into(),
        asm::Stack::Push(0).into(),
        asm::TotalControlFlow::HaltIf.into(),
        asm::Stack::Push(1).into(),
        asm::Alu::Add.into(),
    ];
    let op_gas_cost = &|_: &Op| 1;
    let mut vm = Vm::default();
    vm.exec_ops(
        ops,
        access.clone(),
        &EmptyState,
        op_gas_cost,
        GasLimit::UNLIMITED,
    )
    .unwrap();
    assert_eq!(&vm.stack[..], &[3]);
}

#[test]
fn test_panic_if() {
    let mut stack = crate::Stack::default();
    stack.push(42).unwrap();
    stack.push(43).unwrap();
    stack.push(1).unwrap();

    let err = super::panic_if(&mut stack).unwrap_err();
    assert!(err.to_string().ends_with("[42, 43]"),);
    assert!(
        matches!(err, OpError::TotalControlFlow(TotalControlFlowError::Panic(s)) if s == vec![42, 43])
    );

    let mut stack = crate::Stack::default();
    stack.push(1).unwrap();

    let err = super::panic_if(&mut stack).unwrap_err();
    assert!(err.to_string().ends_with("[]"),);
    assert!(
        matches!(err, OpError::TotalControlFlow(TotalControlFlowError::Panic(s)) if s.is_empty())
    );

    let mut stack = crate::Stack::default();
    stack.push(42).unwrap();
    stack.push(43).unwrap();
    stack.push(0).unwrap();

    super::panic_if(&mut stack).unwrap();
    assert_eq!(stack.len(), 2);
    assert_eq!(stack.pop().unwrap(), 43);
    assert_eq!(stack.pop().unwrap(), 42);

    let mut stack = crate::Stack::default();
    stack.push(42).unwrap();
    stack.push(43).unwrap();
    let err = super::panic_if(&mut stack).unwrap_err();
    assert!(matches!(
        err,
        OpError::TotalControlFlow(TotalControlFlowError::InvalidPanicIfCondition)
    ));
}