fix(joinir): Phase 177-3 ValueId collision fix for multi-carrier loops
Root cause: JoinIR ValueId collision between function parameters and condition bindings - Same ValueId used for both `result_init` (carrier param) and `limit` (condition var) - Phase 33-21 was overwriting condition bindings when remapping carrier PHIs Fix implemented (Option B - immediate protection): 1. Phase 177-3: Protect condition-only variables from Phase 33-21 override - Collect condition_bindings that are NOT carriers (by checking exit_bindings) - Skip remapping for these protected ValueIds 2. Phase 177-3-B: Handle body-only carriers explicitly - Carriers that appear in condition_bindings (added by Phase 176-5) - Map them to correct PHI dsts by name lookup Investigation tools added: - [DEBUG-177] trace logs for remapper state tracking - Phase 177-3 protection logging - BoundaryInjector PHI collision detection Test results: - ✅ Integer multi-carrier test: Output 3 (expected) - ⚠️ String test: RC=0 but empty output (separate issue - string concat emit) Design docs created: - phase177-parse-string-design.md: _parse_string loop analysis - phase177-carrier-evolution.md: Carrier progression Phase 174-179 Next: Investigate string concatenation emit for full _parse_string support
This commit is contained in:
nyash-codex
@ -80,7 +80,8 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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}
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// Phase 1: Allocate block IDs for all functions
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let mut remapper = block_allocator::allocate_blocks(builder, mir_module, debug)?;
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// Phase 177-3: block_allocator now returns exit_block_id to avoid conflicts
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let (mut remapper, exit_block_id) = block_allocator::allocate_blocks(builder, mir_module, debug)?;
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// Phase 2: Collect values from all functions
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let (mut used_values, value_to_func_name, function_params) =
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@ -113,6 +114,30 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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// Phase 3: Remap ValueIds
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remap_values(builder, &used_values, &mut remapper, debug)?;
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// Phase 177-3 DEBUG: Verify remapper state after Phase 3
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eprintln!("[DEBUG-177] === Remapper state after Phase 3 ===");
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eprintln!("[DEBUG-177] used_values count: {}", used_values.len());
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for value_id in &used_values {
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if let Some(remapped) = remapper.get_value(*value_id) {
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eprintln!("[DEBUG-177] JoinIR {:?} → Host {:?}", value_id, remapped);
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} else {
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eprintln!("[DEBUG-177] JoinIR {:?} → NOT FOUND ❌", value_id);
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}
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}
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// Check condition_bindings specifically
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if let Some(boundary) = boundary {
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eprintln!("[DEBUG-177] === Condition bindings check ===");
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for binding in &boundary.condition_bindings {
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let lookup_result = remapper.get_value(binding.join_value);
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eprintln!(
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"[DEBUG-177] '{}': JoinIR {:?} → {:?}",
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binding.name, binding.join_value, lookup_result
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);
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}
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}
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eprintln!("[DEBUG-177] ==============================");
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// Phase 3.5: Build loop header PHIs (if loop pattern with loop_var_name)
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//
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// We need to know PHI dsts before instruction_rewriter runs, so that:
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@ -215,9 +240,47 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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// 2. loop body uses PHI result
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// 3. tail call args are correctly routed
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// Map main's parameters
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// MIR function keys use join_func_N format from join_func_name()
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// Phase 177-3 fix: Protect condition-ONLY bindings from being overridden to PHI dsts
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//
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// Problem: condition_bindings may contain:
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// 1. True condition-only variables (e.g., 'limit' in loop(i < limit)) - NOT carriers
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// 2. Body-only carriers added by Phase 176-5 (e.g., 'result') - ARE carriers
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//
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// We must ONLY protect (1), not (2), because:
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// - Condition-only vars should keep their HOST mapping (e.g., limit = %8)
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// - Body-only carriers MUST be remapped to PHI dsts (e.g., result = %24)
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//
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// Solution: Protect condition_bindings that are NOT in exit_bindings (i.e., not carriers)
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let carrier_names: std::collections::HashSet<&str> = boundary
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.exit_bindings
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.iter()
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.map(|eb| eb.carrier_name.as_str())
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.collect();
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let condition_binding_ids: std::collections::HashSet<ValueId> = boundary
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.condition_bindings
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.iter()
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.filter(|cb| !carrier_names.contains(cb.name.as_str()))
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.map(|cb| cb.join_value)
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.collect();
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if !condition_binding_ids.is_empty() {
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eprintln!(
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"[cf_loop/joinir] Phase 177-3: Protected ValueIds (condition-only, not carriers): {:?}",
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condition_binding_ids
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);
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for cb in &boundary.condition_bindings {
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let is_carrier = carrier_names.contains(cb.name.as_str());
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eprintln!(
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"[cf_loop/joinir] Phase 177-3: '{}': JoinIR {:?} (carrier={})",
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cb.name, cb.join_value, is_carrier
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);
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}
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}
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let main_func_name = "join_func_0";
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let loop_step_func_name = "join_func_1";
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if function_params.get(main_func_name).is_none() {
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eprintln!(
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"[cf_loop/joinir] WARNING: function_params.get('{}') returned None. Available keys: {:?}",
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@ -226,30 +289,57 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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);
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}
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if let Some(main_params) = function_params.get(main_func_name) {
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if debug {
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eprintln!(
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"[cf_loop/joinir] Phase 33-21: main ({}) params: {:?}",
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main_func_name, main_params
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);
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}
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eprintln!(
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"[DEBUG-177] Phase 33-21: main ({}) params: {:?}",
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main_func_name, main_params
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);
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eprintln!(
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"[DEBUG-177] Phase 33-21: carrier_phis count: {}, names: {:?}",
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phi_info.carrier_phis.len(),
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phi_info.carrier_phis.iter().map(|(n, _)| n.as_str()).collect::<Vec<_>>()
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);
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// Map main's parameters to header PHI dsts
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// main params: [i_init, carrier1_init, ...]
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// carrier_phis: [("i", entry), ("sum", entry), ...]
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for (idx, (carrier_name, entry)) in phi_info.carrier_phis.iter().enumerate() {
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if let Some(&main_param) = main_params.get(idx) {
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if debug {
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// Phase 177-3: Don't override condition_bindings
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if condition_binding_ids.contains(&main_param) {
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eprintln!(
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"[cf_loop/joinir] Phase 33-21: REMAP main param {:?} → {:?} ('{}')",
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main_param, entry.phi_dst, carrier_name
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"[cf_loop/joinir] Phase 177-3: Skipping override for condition_binding {:?} ('{}')",
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main_param, carrier_name
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);
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continue;
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}
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eprintln!(
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"[DEBUG-177] Phase 33-21: REMAP main param[{}] {:?} → {:?} ('{}')",
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idx, main_param, entry.phi_dst, carrier_name
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);
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remapper.set_value(main_param, entry.phi_dst);
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}
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}
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}
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// Phase 177-3-B: Handle body-only carriers
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// These are carriers in carrier_phis that are NOT in main function params.
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// They appear in condition_bindings (added by Phase 176-5) but need PHI remapping.
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for (carrier_name, entry) in &phi_info.carrier_phis {
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// Check if this carrier has a condition_binding
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if let Some(binding) = boundary.condition_bindings.iter().find(|cb| cb.name == *carrier_name) {
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// Skip if it's a true condition-only variable (already protected above)
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if condition_binding_ids.contains(&binding.join_value) {
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continue;
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}
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// This is a body-only carrier - remap it to PHI dst
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eprintln!(
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"[cf_loop/joinir] Phase 177-3-B: Body-only carrier '{}': JoinIR {:?} → PHI {:?}",
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carrier_name, binding.join_value, entry.phi_dst
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);
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remapper.set_value(binding.join_value, entry.phi_dst);
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}
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}
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// Map loop_step's parameters
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let loop_step_func_name = "join_func_1";
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if debug {
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eprintln!(
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"[cf_loop/joinir] Phase 33-21: function_params keys: {:?}",
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@ -275,6 +365,14 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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// carrier_phis: [("i", entry), ("sum", entry), ...]
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for (idx, (carrier_name, entry)) in phi_info.carrier_phis.iter().enumerate() {
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if let Some(&loop_step_param) = loop_step_params.get(idx) {
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// Phase 177-3: Don't override condition_bindings
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if condition_binding_ids.contains(&loop_step_param) {
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eprintln!(
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"[cf_loop/joinir] Phase 177-3: Skipping override for condition_binding {:?} ('{}')",
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loop_step_param, carrier_name
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);
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continue;
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}
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if debug {
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eprintln!(
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"[cf_loop/joinir] Phase 33-21: REMAP loop_step param {:?} → {:?} ('{}')",
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@ -290,11 +388,18 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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// Fallback: Use old behavior (ValueId(0), ValueId(1), ...)
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// This handles patterns that don't have loop_step function
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if let Some(phi_dst) = phi_info.get_carrier_phi(loop_var_name) {
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remapper.set_value(ValueId(0), phi_dst);
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if debug {
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// Phase 177-3: Don't override condition_bindings
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if !condition_binding_ids.contains(&ValueId(0)) {
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remapper.set_value(ValueId(0), phi_dst);
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if debug {
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eprintln!(
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"[cf_loop/joinir] Phase 33-16 fallback: Override remap ValueId(0) → {:?} (PHI dst)",
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phi_dst
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);
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}
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} else {
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eprintln!(
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"[cf_loop/joinir] Phase 33-16 fallback: Override remap ValueId(0) → {:?} (PHI dst)",
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phi_dst
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"[cf_loop/joinir] Phase 177-3 fallback: Skipping override for condition_binding ValueId(0)"
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);
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}
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}
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@ -303,16 +408,34 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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continue;
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}
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let join_value_id = ValueId(idx as u32);
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remapper.set_value(join_value_id, entry.phi_dst);
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if debug {
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// Phase 177-3: Don't override condition_bindings
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if !condition_binding_ids.contains(&join_value_id) {
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remapper.set_value(join_value_id, entry.phi_dst);
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if debug {
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eprintln!(
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"[cf_loop/joinir] Phase 33-20 fallback: Override remap {:?} → {:?} (carrier '{}' PHI dst)",
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join_value_id, entry.phi_dst, carrier_name
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);
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}
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} else {
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eprintln!(
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"[cf_loop/joinir] Phase 33-20 fallback: Override remap {:?} → {:?} (carrier '{}' PHI dst)",
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join_value_id, entry.phi_dst, carrier_name
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"[cf_loop/joinir] Phase 177-3 fallback: Skipping override for condition_binding {:?} ('{}')",
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join_value_id, carrier_name
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);
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}
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}
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}
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// Phase 177-3 DEBUG: Check remapper after Phase 33-21 overrides
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eprintln!("[DEBUG-177] === Remapper state after Phase 33-21 ===");
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for binding in &boundary.condition_bindings {
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let lookup_result = remapper.get_value(binding.join_value);
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eprintln!(
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"[DEBUG-177] '{}': JoinIR {:?} → {:?} (after 33-21)",
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binding.name, binding.join_value, lookup_result
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);
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}
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phi_info
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} else {
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LoopHeaderPhiInfo::empty(entry_block_remapped)
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@ -323,6 +446,7 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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// Phase 4: Merge blocks and rewrite instructions
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// Phase 33-16: Pass mutable loop_header_phi_info for latch_incoming tracking
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// Phase 177-3: Pass exit_block_id from allocator to avoid conflicts
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let merge_result = instruction_rewriter::merge_and_rewrite(
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builder,
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mir_module,
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@ -331,6 +455,7 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
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&function_params,
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boundary,
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&mut loop_header_phi_info,
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exit_block_id,
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debug,
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)?;
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