83 lines
3.2 KiB
Rust
83 lines
3.2 KiB
Rust
//! Phase 121: StepTree → JoinModule shadow lowering (if-only)
|
||
//!
|
||
//! ## Responsibility
|
||
//!
|
||
//! - Convert StepTree to JoinModule (Normalized dialect)
|
||
//! - Only for if-only patterns (no loops)
|
||
//! - Returns None for out-of-scope patterns
|
||
//! - Returns Err for patterns that should be supported but conversion failed
|
||
|
||
use crate::mir::control_tree::normalized_shadow::env_layout::{
|
||
expected_env_field_count as calc_expected_env_fields, EnvLayout,
|
||
};
|
||
use crate::mir::control_tree::normalized_shadow::if_as_last_join_k::IfAsLastJoinKLowererBox;
|
||
use crate::mir::control_tree::normalized_shadow::legacy::LegacyLowerer;
|
||
use crate::mir::control_tree::step_tree::StepTree;
|
||
use crate::mir::join_ir::lowering::carrier_info::JoinFragmentMeta;
|
||
use crate::mir::join_ir::JoinModule;
|
||
use crate::mir::ValueId; // Phase 126
|
||
use std::collections::BTreeMap; // Phase 126
|
||
|
||
use super::contracts::{check_if_only, CapabilityCheckResult};
|
||
|
||
/// Box-First: StepTree → Normalized shadow lowering
|
||
pub struct StepTreeNormalizedShadowLowererBox;
|
||
|
||
impl StepTreeNormalizedShadowLowererBox {
|
||
/// Phase 129-B: Expected env field count (writes + inputs)
|
||
pub fn expected_env_field_count(
|
||
step_tree: &StepTree,
|
||
available_inputs: &BTreeMap<String, ValueId>,
|
||
) -> usize {
|
||
calc_expected_env_fields(step_tree, available_inputs)
|
||
}
|
||
|
||
/// Phase 129-B: If-as-last shape detection (no post-if)
|
||
pub fn expects_join_k_as_last(step_tree: &StepTree) -> bool {
|
||
IfAsLastJoinKLowererBox::expects_join_k_as_last(step_tree)
|
||
}
|
||
|
||
/// Try to lower an if-only StepTree to normalized form
|
||
///
|
||
/// - `Ok(None)`: Out of scope (e.g., contains loops)
|
||
/// - `Ok(Some(...))`: Shadow generation succeeded
|
||
/// - `Err(...)`: Should be supported but conversion failed (internal error)
|
||
pub fn try_lower_if_only(
|
||
step_tree: &StepTree,
|
||
available_inputs: &BTreeMap<String, ValueId>,
|
||
) -> Result<Option<(JoinModule, JoinFragmentMeta)>, String> {
|
||
let capability = check_if_only(step_tree);
|
||
match capability {
|
||
CapabilityCheckResult::Supported => {
|
||
Self::lower_if_only_to_normalized(step_tree, available_inputs)
|
||
}
|
||
CapabilityCheckResult::Unsupported(_reason) => Ok(None),
|
||
}
|
||
}
|
||
|
||
/// Lower if-only StepTree to Normalized JoinModule (Phase 122-126)
|
||
fn lower_if_only_to_normalized(
|
||
step_tree: &StepTree,
|
||
available_inputs: &BTreeMap<String, ValueId>,
|
||
) -> Result<Option<(JoinModule, JoinFragmentMeta)>, String> {
|
||
// Phase 126: EnvLayout 生成（available_inputs を使用）
|
||
let env_layout = EnvLayout::from_contract(&step_tree.contract, available_inputs);
|
||
|
||
// Phase 129-B: If-as-last join_k lowering (dev-only)
|
||
if let Some((module, meta)) = IfAsLastJoinKLowererBox::lower(step_tree, &env_layout)? {
|
||
return Ok(Some((module, meta)));
|
||
}
|
||
|
||
// Legacy path (Phase 123-128 scope)
|
||
LegacyLowerer::lower_if_only_to_normalized(step_tree, &env_layout)
|
||
}
|
||
|
||
/// Dev log helper for out-of-scope cases
|
||
pub fn get_status_string(step_tree: &StepTree) -> String {
|
||
format!(
|
||
"shadow=skipped signature_basis={}",
|
||
step_tree.signature_basis_string()
|
||
)
|
||
}
|
||
}
|