feat(joinir): allow accumulator as LoopState carrier (Pattern2 + ScopeManager delegation)
- Integrate MutableAccumulatorAnalyzer into pattern2_with_break.rs - Delegate read-only check to ScopeManager (SSOT search order) - Promote valid accumulators to mutable LoopState carriers - Accumulator updates handled by existing carrier mechanism - Fail-Fast: mutable RHS (not supported yet) - Allow LoopBodyLocal RHS (validated later in lowering) - loop_body_local_init.rs: Align receiver search order with SSOT (ConditionEnv first) - Error prefix: [joinir/mutable-acc] 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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nyash-codex
@ -81,7 +81,7 @@ fn prepare_pattern2_inputs(
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let loop_var_name = ctx.loop_var_name.clone();
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let loop_var_id = ctx.loop_var_id;
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let carrier_info = ctx.carrier_info.clone();
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let mut carrier_info = ctx.carrier_info.clone(); // Phase 100 P2-2: Make mutable for accumulator promotion
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let scope = ctx.loop_scope.clone();
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log.log(
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@ -184,6 +184,148 @@ fn prepare_pattern2_inputs(
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}
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}
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// Phase 100 P2-2: Mutable Accumulator Analysis
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// Detect accumulator pattern (target = target + x) and promote to carrier
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use crate::mir::loop_pattern_detection::mutable_accumulator_analyzer::{
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MutableAccumulatorAnalyzer, RhsExprKind,
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};
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let mutable_spec = MutableAccumulatorAnalyzer::analyze(body)?;
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if let Some(spec) = mutable_spec {
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if verbose {
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log.log(
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"phase100_p2",
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format!(
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"Detected mutable accumulator: '{}' = '{}' + '{}'",
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spec.target_name,
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spec.target_name,
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spec.rhs_var_or_lit
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),
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);
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}
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// Check target is loop-outer (not in LoopBodyLocalEnv which is empty at this point)
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// This check will be redundant for Pattern2 since body_local_env is always empty,
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// but we keep it for consistency with the spec
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// Resolve target in variable_map
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let target_id = builder
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.variable_ctx
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.variable_map
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.get(&spec.target_name)
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.ok_or_else(|| {
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format!(
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"[joinir/mutable-acc] Target '{}' not found in variable_map",
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spec.target_name
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)
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})?;
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// Check RHS read-only via captured_env lookup
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// According to spec: x ∈ {Const, BodyLocal, Captured, Pinned, Carrier}
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// At this point in prepare_pattern2_inputs:
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// - Const/Literal: Always read-only
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// - BodyLocal: Not yet defined (body_local_env is empty)
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// - Captured: In captured_env
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// - Pinned: In captured_env (just added above)
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// - Carrier: In carrier_info (from ctx)
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match spec.rhs_expr_kind {
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RhsExprKind::Literal => {
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// Literals are always read-only, OK
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if verbose {
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log.log(
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"phase100_p2",
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format!(
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"RHS is literal '{}' (read-only, OK)",
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spec.rhs_var_or_lit
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),
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);
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}
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}
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RhsExprKind::Var => {
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// Use captured_env + carrier_info to check if rhs_var is read-only
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let rhs_name = &spec.rhs_var_or_lit;
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// Check if RHS is in captured_env (read-only)
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let in_captured = captured_env.vars.iter().any(|v| &v.name == rhs_name);
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// Check if RHS is in carrier_info (could be mutable)
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let in_carrier = carrier_info
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.carriers
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.iter()
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.any(|c| &c.name == rhs_name);
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if in_carrier {
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// RHS is a carrier - this could be mutable
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// Fail-Fast: We don't support mutable RHS yet
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return Err(format!(
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"[joinir/mutable-acc] RHS '{}' must be read-only (Condition/BodyLocal/Captured/Pinned), but found mutable Carrier",
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rhs_name
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));
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} else if !in_captured && !builder.variable_ctx.variable_map.contains_key(rhs_name) {
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// RHS might be a LoopBodyLocal (defined inside loop)
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// We can't validate it at this point because body_local_env is empty
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// The lowering phase will validate it later
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if verbose {
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log.log(
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"phase100_p2",
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format!(
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"RHS '{}' not in captured/variable_map, assuming LoopBodyLocal (will validate later)",
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rhs_name
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),
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);
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}
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} else {
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// RHS is read-only (in captured_env or loop-outer variable_map)
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if verbose {
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log.log(
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"phase100_p2",
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format!(
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"RHS '{}' is read-only (in_captured={}, in_variable_map={})",
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rhs_name,
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in_captured,
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builder.variable_ctx.variable_map.contains_key(rhs_name)
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),
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);
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}
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}
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}
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}
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// OK → Register as mutable LoopState carrier
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// Note: We add this to carrier_info which was cloned from ctx.carrier_info
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// This means it will participate in the loop state carrier mechanism
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if verbose {
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log.log(
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"phase100_p2",
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format!(
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"Promoting '{}' to mutable LoopState carrier",
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spec.target_name
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),
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);
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}
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// Add to carrier_info
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use crate::mir::join_ir::lowering::carrier_info::CarrierVar;
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carrier_info
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.carriers
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.push(CarrierVar::new(spec.target_name.clone(), *target_id));
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if verbose {
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log.log(
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"phase100_p2",
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format!(
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"carrier_info now has {} carriers",
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carrier_info.carriers.len()
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),
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);
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}
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} else if verbose {
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log.log("phase100_p2", "No mutable accumulator pattern detected");
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}
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// Value space + condition env
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let mut join_value_space = JoinValueSpace::new();
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let (mut env, mut condition_bindings, _loop_var_join_id) =
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