aver/codegen/
mod.rs

1/// Aver → target language transpilation.
2///
3/// The codegen module transforms a type-checked Aver AST into source code
4/// for a target language. Current backends: Rust deployment and Lean proof export.
5pub(crate) mod builtins;
6pub(crate) mod common;
7pub mod dafny;
8pub mod lean;
9pub mod rust;
10
11use std::collections::{HashMap, HashSet};
12
13use crate::ast::{FnDef, TopLevel, TypeDef};
14use crate::types::checker::TypeCheckResult;
15
16/// Information about a dependent module loaded for codegen.
17pub struct ModuleInfo {
18    /// Qualified module path, e.g. "Models.User".
19    pub prefix: String,
20    /// Direct `depends [...]` entries from the source module.
21    pub depends: Vec<String>,
22    /// Type definitions from the module.
23    pub type_defs: Vec<TypeDef>,
24    /// Function definitions from the module (excluding `main`).
25    pub fn_defs: Vec<FnDef>,
26}
27
28/// Collected context from the Aver program, shared across all backends.
29pub struct CodegenContext {
30    /// All top-level items (post-TCO transform, post-typecheck).
31    pub items: Vec<TopLevel>,
32    /// Function signatures: name → (param_types, return_type, effects).
33    pub fn_sigs: HashMap<String, (Vec<crate::types::Type>, crate::types::Type, Vec<String>)>,
34    /// Functions eligible for auto-memoization.
35    pub memo_fns: HashSet<String>,
36    /// Set of type names whose values are memo-safe.
37    pub memo_safe_types: HashSet<String>,
38    /// User-defined type definitions (for struct/enum generation).
39    pub type_defs: Vec<TypeDef>,
40    /// User-defined function definitions.
41    pub fn_defs: Vec<FnDef>,
42    /// Project/binary name.
43    pub project_name: String,
44    /// Dependent modules loaded for inlining.
45    pub modules: Vec<ModuleInfo>,
46    /// Set of module prefixes for qualified name resolution (e.g. "Models.User").
47    pub module_prefixes: HashSet<String>,
48    /// Embedded runtime policy from `aver.toml` for generated code.
49    pub policy: Option<crate::config::ProjectConfig>,
50    /// Emit generated scoped runtime support (replay and/or runtime-loaded policy).
51    pub emit_replay_runtime: bool,
52    /// Load runtime policy from the active module root instead of embedding it.
53    pub runtime_policy_from_env: bool,
54    /// Explicit guest entry boundary for scoped replay/policy.
55    pub guest_entry: Option<String>,
56    /// Emit extra generated helpers needed by the cached self-host runtime.
57    pub emit_self_host_runtime: bool,
58}
59
60/// Output files from a codegen backend.
61pub struct ProjectOutput {
62    /// Files to write: (relative_path, content).
63    pub files: Vec<(String, String)>,
64}
65
66/// Build a CodegenContext from parsed + type-checked items.
67pub fn build_context(
68    items: Vec<TopLevel>,
69    tc_result: &TypeCheckResult,
70    memo_fns: HashSet<String>,
71    project_name: String,
72    modules: Vec<ModuleInfo>,
73) -> CodegenContext {
74    let type_defs: Vec<TypeDef> = items
75        .iter()
76        .filter_map(|item| {
77            if let TopLevel::TypeDef(td) = item {
78                Some(td.clone())
79            } else {
80                None
81            }
82        })
83        .collect();
84
85    let fn_defs: Vec<FnDef> = items
86        .iter()
87        .filter_map(|item| {
88            if let TopLevel::FnDef(fd) = item {
89                Some(fd.clone())
90            } else {
91                None
92            }
93        })
94        .collect();
95
96    let module_prefixes: HashSet<String> = modules.iter().map(|m| m.prefix.clone()).collect();
97
98    CodegenContext {
99        items,
100        fn_sigs: tc_result.fn_sigs.clone(),
101        memo_fns,
102        memo_safe_types: tc_result.memo_safe_types.clone(),
103        type_defs,
104        fn_defs,
105        project_name,
106        modules,
107        module_prefixes,
108        policy: None,
109        emit_replay_runtime: false,
110        runtime_policy_from_env: false,
111        guest_entry: None,
112        emit_self_host_runtime: false,
113    }
114}
aver/codegen/mod.rs

aver/codegen/
mod.rs
