lisette-semantics 0.2.13

Little language inspired by Rust that compiles to Go
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 syntax::ast::{Expression, Span};
use syntax::types::Type;

use crate::checker::TaskState;

fn is_sync_lock_type(ty: &Type) -> bool {
    matches!(
        ty.strip_refs(),
        Type::Nominal { id, .. }
            if matches!(id.as_str(), "go:sync.Mutex" | "go:sync.RWMutex" | "go:sync.Locker")
    )
}

impl TaskState<'_> {
    pub(crate) fn check_deferred_lock(&mut self, deferred: &Expression) {
        let Expression::Call {
            expression: callee,
            args,
            span,
            ..
        } = deferred.unwrap_parens()
        else {
            return;
        };

        if !args.is_empty() {
            return;
        }

        let Expression::DotAccess {
            expression: receiver,
            member,
            ..
        } = callee.unwrap_parens()
        else {
            return;
        };

        let (locked, unlock) = match member.as_str() {
            "Lock" => ("Lock", "Unlock"),
            "RLock" => ("RLock", "RUnlock"),
            _ => return,
        };

        if !is_sync_lock_type(&receiver.get_type()) {
            return;
        }

        self.sink
            .push(diagnostics::infer::deferred_lock(*span, locked, unlock));
    }

    pub(crate) fn check_return_in_try_block(&mut self, span: Span) {
        if self.scopes.lookup_try_block_context().is_some() {
            self.sink
                .push(diagnostics::infer::return_in_try_block(span));
        }
    }

    pub(crate) fn check_break_outside_loop(&mut self, span: Span) {
        // Only emit the generic "break outside loop" error when not in a
        // try/recover/defer block, since those have their own more specific errors.
        if !self.scopes.is_inside_loop()
            && self.scopes.lookup_try_block_context().is_none()
            && self.scopes.lookup_recover_block_context().is_none()
            && !self.scopes.is_inside_defer_block()
        {
            self.sink.push(diagnostics::infer::break_outside_loop(span));
        }
    }

    pub(crate) fn check_continue_outside_loop(&mut self, span: Span) {
        // Only emit the generic "continue outside loop" error when not in a
        // try/recover/defer block, since those have their own more specific errors.
        if !self.scopes.is_inside_loop()
            && self.scopes.lookup_try_block_context().is_none()
            && self.scopes.lookup_recover_block_context().is_none()
            && !self.scopes.is_inside_defer_block()
        {
            self.sink
                .push(diagnostics::infer::continue_outside_loop(span));
        }
    }

    pub(crate) fn check_break_in_try_block(&mut self, span: Span) {
        if let Some(ctx) = self.scopes.lookup_try_block_context()
            && !ctx.loop_depth.is_active()
        {
            self.sink.push(diagnostics::infer::break_in_try_block(span));
        }
    }

    pub(crate) fn check_continue_in_try_block(&mut self, span: Span) {
        if let Some(ctx) = self.scopes.lookup_try_block_context()
            && !ctx.loop_depth.is_active()
        {
            self.sink
                .push(diagnostics::infer::continue_in_try_block(span));
        }
    }

    pub(crate) fn check_return_in_recover_block(&mut self, span: Span) {
        if self.scopes.lookup_recover_block_context().is_some() {
            self.sink
                .push(diagnostics::infer::return_in_recover_block(span));
        }
    }

    pub(crate) fn check_break_in_recover_block(&mut self, span: Span) {
        if let Some(ctx) = self.scopes.lookup_recover_block_context()
            && !ctx.loop_depth.is_active()
        {
            self.sink
                .push(diagnostics::infer::break_in_recover_block(span));
        }
    }

    pub(crate) fn check_continue_in_recover_block(&mut self, span: Span) {
        if let Some(ctx) = self.scopes.lookup_recover_block_context()
            && !ctx.loop_depth.is_active()
        {
            self.sink
                .push(diagnostics::infer::continue_in_recover_block(span));
        }
    }

    pub(crate) fn check_return_in_defer_block(&mut self, span: Span) {
        if self.scopes.is_inside_defer_block() {
            self.sink
                .push(diagnostics::infer::return_in_defer_block(span));
        }
    }

    pub(crate) fn check_break_in_defer_block(&mut self, span: Span) {
        if self.scopes.is_inside_defer_block() && self.scopes.defer_block_loop_depth() == 0 {
            self.sink
                .push(diagnostics::infer::break_in_defer_block(span));
        }
    }

    pub(crate) fn check_continue_in_defer_block(&mut self, span: Span) {
        if self.scopes.is_inside_defer_block() && self.scopes.defer_block_loop_depth() == 0 {
            self.sink
                .push(diagnostics::infer::continue_in_defer_block(span));
        }
    }
}