geam 0.1.1

Experimental Rust-embedded execution runtime for typed Gleam programs
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

use super::super::environment::BlockEnvironment;
use super::value::{custom_projection, inputs_with_captures, list_element, tuple_projection};
use crate::plan::ValueType;
use crate::plan::execution::function::ExecutionGraphProfile;
use crate::plan::execution::graph::{ExternalInstructionRef, ExternalInstructionView};
use crate::runtime::error::ExecutionResult;
use crate::runtime::evaluated::{EvaluatedExternalValue, EvaluatedValue};
use crate::runtime::state::RuntimeStateFor;
use crate::runtime::{ExecutableRuntimePlan, RuntimeGraph};

pub(super) fn evaluate<Plan>(
    plan: &Plan,
    state: &mut RuntimeStateFor<'_, Plan>,
    environment: &BlockEnvironment,
    instruction: &<RuntimeGraph<Plan> as ExecutionGraphProfile>::ExternalInstruction,
    expected: &ValueType,
) -> ExecutionResult<EvaluatedExternalValue>
where
    Plan: ExecutableRuntimePlan,
{
    match instruction.instruction_ref() {
        ExternalInstructionRef::Call {
            function,
            args,
            site,
        } => crate::runtime::function::run_external(
            plan,
            state,
            RuntimeGraph::<Plan>::external_function(function),
            crate::runtime::error::HostCallOrigin::source(site.to_owned()),
            environment.retain(args),
        ),
        ExternalInstructionRef::FunctionCall {
            function,
            args,
            site,
        } => {
            let function = environment.external_function(function);
            crate::runtime::function::run_external(
                plan,
                state,
                function.runtime_id(),
                crate::runtime::error::HostCallOrigin::source(site.to_owned()),
                inputs_with_captures(environment, args, function.captures()),
            )
        }
        ExternalInstructionRef::TupleIndex { tuple, index } => tuple_projection(
            plan.value_metadata(),
            environment,
            tuple,
            index,
            expected,
            external_value,
        ),
        ExternalInstructionRef::CustomField { source, index } => {
            custom_projection(plan, environment, source, index, expected, external_value)
        }
        ExternalInstructionRef::ListIndex { list, index } => {
            let list = environment.external_list(list);
            let values = state.lists().external_values(&list);
            list_element(expected, index, &values)
        }
    }
}

fn external_value(value: &EvaluatedValue) -> Option<EvaluatedExternalValue> {
    let EvaluatedValue::External(value) = value else {
        return None;
    };
    Some(value.clone())
}

#[cfg(test)]
mod tests {
    use super::external_value;
    use crate::host::HostExternalStore;
    use crate::plan::execution::type_::ExternalTypeId;
    use crate::runtime::{EvaluatedExternalValue, EvaluatedValue};

    #[test]
    fn extracts_external_instruction_values() {
        fn source_hash(
            context: &crate::host::HostExternalHashing<'_>,
            value: &crate::host::HostStoredValue<num_bigint::BigInt>,
        ) -> u64 {
            context.stored_value_hash(value)
        }

        fn inspect(
            context: &crate::host::HostExternalInspection<'_>,
            value: &crate::host::HostStoredValue<num_bigint::BigInt>,
        ) -> ecow::EcoString {
            context.inspect_stored_value(value)
        }

        let store = HostExternalStore::default();
        let source_equal =
            |context: &crate::host::HostExternalEquality<'_>,
             left: &crate::host::HostStoredValue<num_bigint::BigInt>,
             right: &crate::host::HostStoredValue<num_bigint::BigInt>| {
                context.stored_values_equal(left, right)
            };
        let lease = store.insert(
            crate::host::HostStoredValue::new(crate::runtime::StoredRuntimeValue::test_int(
                7.into(),
            )),
            source_equal,
            source_hash,
            inspect,
        );
        let equal = store.insert(
            crate::host::HostStoredValue::new(crate::runtime::StoredRuntimeValue::test_int(
                7.into(),
            )),
            source_equal,
            source_hash,
            inspect,
        );
        let stored_equal =
            |left: &crate::runtime::StoredRuntimeValue,
             right: &crate::runtime::StoredRuntimeValue| left.value() == right.value();
        let equality = crate::host::HostExternalEquality::new(&stored_equal);
        assert!(lease.source_equal(&equality, &equal));
        let expected = EvaluatedExternalValue::new(ExternalTypeId::new(0), lease);
        let stored_inspect = |_: &crate::runtime::StoredRuntimeValue| "7".into();
        let inspection = crate::host::HostExternalInspection::new(&stored_inspect);

        let stored_hash = |_: &crate::runtime::StoredRuntimeValue| 7;
        let hashing = crate::host::HostExternalHashing::new(&stored_hash);
        assert_eq!(expected.source_hash(&hashing), 7);
        assert_eq!(expected.lease().inspection(&inspection), "7");
        assert_eq!(
            external_value(&EvaluatedValue::External(expected.clone())),
            Some(expected),
        );
    }

    #[test]
    fn rejects_non_external_instruction_values() {
        assert_eq!(external_value(&EvaluatedValue::Bool(true)), None,);
    }
}