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feat(joinir): Phase 33-14 JoinFragmentMeta for expr/carrier separation

Browse Source 
Introduces JoinFragmentMeta to distinguish between loop expression results
and carrier variable updates, fixing SSA correctness issues.

## Changes

### New: JoinFragmentMeta struct (carrier_info.rs)
- `expr_result: Option<ValueId>` - Loop as expression (return loop(...))
- `exit_meta: ExitMeta` - Carrier updates for variable_map
- Helper methods: with_expr_result(), carrier_only(), empty()

### Pattern 2 Lowerer Updates
- loop_with_break_minimal.rs: Returns (JoinModule, JoinFragmentMeta)
- pattern2_with_break.rs: Sets boundary.expr_result from fragment_meta

### instruction_rewriter.rs
- Phase 33-14: Only add to exit_phi_inputs when boundary.expr_result is Some
- Phase 33-13: MergeResult struct with carrier_inputs map

### JoinInlineBoundary (inline_boundary.rs)
- New field: expr_result: Option<ValueId>
- All constructors updated with expr_result: None default

## Design Philosophy

Previously, exit_phi_inputs mixed expr results with carrier updates, causing:
- PHI inputs referencing undefined remapped values
- SSA-undef errors in VM execution

With JoinFragmentMeta:
- expr_result → exit_phi_inputs (generates PHI for expr value)
- exit_meta → carrier_inputs (updates variable_map via carrier PHIs)

## Test Results
- Pattern 1 (carrier-only): Works correctly (no exit_phi_inputs)
- Pattern 2 (expr result): Design complete, SSA-undef fix deferred to Phase 33-15

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
nyash-codex
2025-12-07 05:07:28 +09:00
parent 35f5a48eb0
commit a09ce0cbff
11 changed files with 339 additions and 70 deletions
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23
src/mir/builder/control_flow/joinir/merge/exit_line/mod.rs
View File

@ -34,12 +34,17 @@
//! 3. Maintain backward compatibility (no breaking changes)
//! 4. Enable independent testing and evolution
//!
//! ## Phase 33-13: Carrier PHI Integration
//! The ExitLineOrchestrator now receives carrier_phis from exit_phi_builder
//! and uses them in ExitLineReconnector instead of the remapped exit values.
//! This ensures variable_map points to PHI-defined values (SSA-correct).
//!
//! ## Future Extensions
//! When implementing Pattern 4 (continue), new pattern lowerers can:
//! ```rust
//! let exit_bindings = ExitMetaCollector::collect(self, &exit_meta, debug);
//! let boundary = JoinInlineBoundary::new_with_exits(...);
//! exit_line::ExitLineOrchestrator::execute(builder, &boundary, &remapper, debug);
//! exit_line::ExitLineOrchestrator::execute(builder, &boundary, &carrier_phis, debug);
//! ```
//! No changes to exit_line module needed!
@ -49,6 +54,9 @@ pub mod meta_collector;
pub use reconnector::ExitLineReconnector;
pub use meta_collector::ExitMetaCollector;
use std::collections::BTreeMap;
use crate::mir::ValueId;
/// Phase 33-10-Refactor-P2: ExitLineOrchestrator facade
///
/// Coordinates the entire exit line reconnection process for Phase 6.
@ -61,7 +69,7 @@ impl ExitLineOrchestrator {
/// # Inputs
/// - builder: MirBuilder with variable_map to update
/// - boundary: JoinInlineBoundary with exit_bindings
/// - remapper: JoinIrIdRemapper for ValueId lookup
/// - carrier_phis: Map from carrier name to PHI dst ValueId (Phase 33-13)
/// - debug: Debug logging enabled
///
/// # Returns
@ -69,21 +77,22 @@ impl ExitLineOrchestrator {
///
/// # Process
/// 1. Validate exit_bindings (empty case)
/// 2. Delegate to ExitLineReconnector
/// 2. Delegate to ExitLineReconnector with carrier_phis
pub fn execute(
builder: &mut crate::mir::builder::MirBuilder,
boundary: &crate::mir::join_ir::lowering::inline_boundary::JoinInlineBoundary,
remapper: &crate::mir::builder::joinir_id_remapper::JoinIrIdRemapper,
carrier_phis: &BTreeMap<String, ValueId>,
debug: bool,
) -> Result<(), String> {
if debug {
eprintln!(
"[cf_loop/joinir/exit_line] ExitLineOrchestrator: Starting Phase 6 reconnection"
"[cf_loop/joinir/exit_line] ExitLineOrchestrator: Starting Phase 6 reconnection with {} carrier PHIs",
carrier_phis.len()
);
}
// Delegate to ExitLineReconnector
ExitLineReconnector::reconnect(builder, boundary, remapper, debug)?;
// Phase 33-13: Delegate to ExitLineReconnector with carrier_phis
ExitLineReconnector::reconnect(builder, boundary, carrier_phis, debug)?;
if debug {
eprintln!("[cf_loop/joinir/exit_line] ExitLineOrchestrator: Phase 6 complete");

80
src/mir/builder/control_flow/joinir/merge/exit_line/reconnector.rs
View File

@ -3,32 +3,43 @@
//! Modularizes the exit line reconnection logic (Phase 6 from merge/mod.rs)
//! into a focused, testable Box.
//!
//! **Responsibility**: Update host variable_map with remapped exit values from JoinIR
//! **Responsibility**: Update host variable_map with PHI dst values from exit block
//!
//! # Phase 33-13 Architecture Change
//!
//! Before: Used remapper to get remapped exit values (SSA-incorrect!)
//! After: Uses carrier_phis map from exit_phi_builder (SSA-correct!)
//!
//! The remapped exit value is an INPUT to the PHI, not the OUTPUT.
//! Only the PHI dst is defined in the exit block and can be referenced later.
use crate::mir::builder::joinir_id_remapper::JoinIrIdRemapper;
use crate::mir::builder::MirBuilder;
use crate::mir::join_ir::lowering::inline_boundary::JoinInlineBoundary;
use crate::mir::ValueId;
use std::collections::BTreeMap;
/// ExitLineReconnector: A Box that manages exit value reconnection
///
/// # Design Notes
///
/// ## Why Separate Box?
/// - Responsibility: Update host variable_map with remapped exit values
/// - Input: JoinInlineBoundary.exit_bindings + JoinIrIdRemapper
/// - Responsibility: Update host variable_map with PHI dst values
/// - Input: JoinInlineBoundary.exit_bindings + carrier_phis map
/// - Output: Updated MirBuilder.variable_map
/// - No side effects beyond variable_map updates
///
/// ## Phase 197-B Multi-Carrier Support
/// This Box implements the fix for multi-carrier exit binding:
/// - Before: Single exit_phi_result applied to all carriers (buggy!)
/// - After: Each carrier gets its specific remapped exit value
/// - Example: `sum` gets ValueId(456), `count` gets ValueId(457)
/// ## Phase 33-13 Carrier PHI Integration
/// This Box now uses carrier_phis from exit_phi_builder:
/// - Before: `variable_map[carrier] = remapper.get(join_exit)` (SSA-incorrect!)
/// - After: `variable_map[carrier] = carrier_phis[carrier]` (SSA-correct!)
///
/// The key insight is that remapped exit values are PHI INPUTS, not OUTPUTS.
/// Only the PHI dst ValueId is defined in the exit block.
///
/// ## Testing Strategy
/// Can be tested independently:
/// 1. Create mock boundary with exit_bindings
/// 2. Create mock remapper
/// 2. Create mock carrier_phis map
/// 3. Call reconnect() and verify variable_map updates
/// 4. No need to construct full merge/mod.rs machinery
///
@ -36,36 +47,36 @@ use crate::mir::join_ir::lowering::inline_boundary::JoinInlineBoundary;
///
/// **Input**:
/// - JoinInlineBoundary with exit_bindings (Carrier → join_exit_value mappings)
/// - JoinIrIdRemapper (JoinIR local → host function ValueId remappings)
/// - carrier_phis: Map from carrier name to PHI dst ValueId
///
/// **Effect**:
/// - Updates builder.variable_map entries for each carrier with remapped exit values
/// - Updates builder.variable_map entries for each carrier with PHI dst values
///
/// **Output**:
/// - Result<(), String> (side effect on builder)
pub struct ExitLineReconnector;
impl ExitLineReconnector {
/// Reconnect exit values to host variable_map
/// Reconnect exit values to host variable_map using carrier PHI dst values
///
/// # Phase 197-B: Multi-carrier support
/// # Phase 33-13: Carrier PHI Integration
///
/// Previously, a single exit_phi_result was applied to all carriers, causing
/// all carriers to get the same value (e.g., both sum and count = 5).
/// Previously, we used the remapper to get remapped exit values. This was
/// SSA-incorrect because those values are PHI inputs, not outputs.
///
/// Now, we use each binding's join_exit_value and the remapper to find
/// the actual exit value for each carrier.
/// Now, we use the carrier_phis map from exit_phi_builder, which contains
/// the actual PHI dst ValueIds that are defined in the exit block.
///
/// # Algorithm
///
/// For each exit_binding:
/// 1. Look up the remapped ValueId for binding.join_exit_value
/// 2. Update variable_map[binding.carrier_name] with remapped value
/// 1. Look up the PHI dst for this carrier in carrier_phis
/// 2. Update variable_map[binding.carrier_name] with PHI dst
/// 3. Log each update (if debug enabled)
pub fn reconnect(
builder: &mut MirBuilder,
boundary: &JoinInlineBoundary,
remapper: &JoinIrIdRemapper,
carrier_phis: &BTreeMap<String, ValueId>,
debug: bool,
) -> Result<(), String> {
// Early return for empty exit_bindings
@ -78,33 +89,34 @@ impl ExitLineReconnector {
if debug {
eprintln!(
"[cf_loop/joinir/exit_line] ExitLineReconnector: Reconnecting {} exit bindings",
boundary.exit_bindings.len()
"[cf_loop/joinir/exit_line] ExitLineReconnector: Reconnecting {} exit bindings with {} carrier PHIs",
boundary.exit_bindings.len(),
carrier_phis.len()
);
}
// Process each exit binding
for binding in &boundary.exit_bindings {
// Look up the remapped exit value
let remapped_exit = remapper.get_value(binding.join_exit_value);
// Phase 33-13: Look up the PHI dst for this carrier
let phi_dst = carrier_phis.get(&binding.carrier_name);
if debug {
eprintln!(
"[cf_loop/joinir/exit_line] ExitLineReconnector: Carrier '{}' join_exit={:?} → remapped={:?}",
binding.carrier_name, binding.join_exit_value, remapped_exit
"[cf_loop/joinir/exit_line] ExitLineReconnector: Carrier '{}' → phi_dst={:?}",
binding.carrier_name, phi_dst
);
}
// Update variable_map if remapping found
if let Some(remapped_value) = remapped_exit {
// Update variable_map with PHI dst
if let Some(&phi_value) = phi_dst {
if let Some(var_vid) = builder.variable_map.get_mut(&binding.carrier_name) {
if debug {
eprintln!(
"[cf_loop/joinir/exit_line] ExitLineReconnector: Updated variable_map['{}'] {:?} → {:?}",
binding.carrier_name, var_vid, remapped_value
"[cf_loop/joinir/exit_line] ExitLineReconnector: Updated variable_map['{}'] {:?} → {:?} (PHI dst)",
binding.carrier_name, var_vid, phi_value
);
}
*var_vid = remapped_value;
*var_vid = phi_value;
} else if debug {
eprintln!(
"[cf_loop/joinir/exit_line] ExitLineReconnector WARNING: Carrier '{}' not found in variable_map",
@ -113,8 +125,8 @@ impl ExitLineReconnector {
}
} else if debug {
eprintln!(
"[cf_loop/joinir/exit_line] ExitLineReconnector WARNING: No remapped value for join_exit={:?}",
binding.join_exit_value
"[cf_loop/joinir/exit_line] ExitLineReconnector WARNING: No PHI dst for carrier '{}' (may be condition-only variable)",
binding.carrier_name
);
}
}

54
src/mir/builder/control_flow/joinir/merge/exit_phi_builder.rs
View File

@ -1,22 +1,31 @@
//! JoinIR Exit PHI Builder
//!
//! Constructs the exit block PHI node that merges return values
//! Constructs the exit block PHI nodes that merge return values
//! from all inlined JoinIR functions.
//!
//! Phase 4 Extraction: Separated from merge_joinir_mir_blocks (lines 581-615)
//! Phase 33-13: Extended to support carrier PHIs for multi-carrier loops
use crate::mir::{BasicBlock, BasicBlockId, MirInstruction, ValueId};
use std::collections::BTreeMap;
/// Phase 5: Create exit block with PHI for return values from JoinIR functions
/// Phase 5: Create exit block with PHI for return values and carrier values
///
/// Phase 189-Fix: Generate exit PHI if there are multiple return values.
/// If no return values, creates empty exit block and returns None.
/// Phase 33-13: Also generates PHI for each carrier variable.
///
/// Returns:
/// - Option<ValueId>: The expr result PHI dst (if any return values)
/// - BTreeMap<String, ValueId>: Carrier name → PHI dst mapping
pub(super) fn build_exit_phi(
builder: &mut crate::mir::builder::MirBuilder,
exit_block_id: BasicBlockId,
exit_phi_inputs: &[(BasicBlockId, ValueId)],
carrier_inputs: &BTreeMap<String, Vec<(BasicBlockId, ValueId)>>,
debug: bool,
) -> Result<Option<ValueId>, String> {
) -> Result<(Option<ValueId>, BTreeMap<String, ValueId>), String> {
let mut carrier_phis: BTreeMap<String, ValueId> = BTreeMap::new();
let exit_phi_result_id = if let Some(ref mut func) = builder.current_function {
let mut exit_block = BasicBlock::new(exit_block_id);
@ -35,7 +44,7 @@ pub(super) fn build_exit_phi(
.push(crate::ast::Span::unknown());
if debug {
eprintln!(
"[cf_loop/joinir] Exit block PHI: {:?} = phi {:?}",
"[cf_loop/joinir] Exit block PHI (expr result): {:?} = phi {:?}",
phi_dst, exit_phi_inputs
);
}
@ -44,11 +53,40 @@ pub(super) fn build_exit_phi(
None
};
// Phase 33-13: Create PHI for each carrier variable
// This ensures that carrier exit values are properly merged when
// there are multiple paths to the exit block
for (carrier_name, inputs) in carrier_inputs {
if inputs.is_empty() {
continue;
}
// Allocate a new ValueId for this carrier's PHI
let phi_dst = builder.value_gen.next();
exit_block.instructions.push(MirInstruction::Phi {
dst: phi_dst,
inputs: inputs.clone(),
type_hint: None,
});
exit_block
.instruction_spans
.push(crate::ast::Span::unknown());
carrier_phis.insert(carrier_name.clone(), phi_dst);
if debug {
eprintln!(
"[cf_loop/joinir] Exit block PHI (carrier '{}'): {:?} = phi {:?}",
carrier_name, phi_dst, inputs
);
}
}
func.add_block(exit_block);
if debug {
eprintln!(
"[cf_loop/joinir] Created exit block: {:?}",
exit_block_id
"[cf_loop/joinir] Created exit block: {:?} with {} carrier PHIs",
exit_block_id, carrier_phis.len()
);
}
phi_result
@ -56,5 +94,5 @@ pub(super) fn build_exit_phi(
None
};
Ok(exit_phi_result_id)
Ok((exit_phi_result_id, carrier_phis))
}

58
src/mir/builder/control_flow/joinir/merge/instruction_rewriter.rs
View File

@ -10,11 +10,22 @@ use crate::mir::builder::joinir_id_remapper::JoinIrIdRemapper;
use crate::mir::join_ir::lowering::inline_boundary::JoinInlineBoundary;
use std::collections::HashMap;
/// Phase 33-13: Return type for merge_and_rewrite
///
/// Contains all information needed for exit PHI construction.
pub struct MergeResult {
/// The ID of the exit block where all Returns jump to
pub exit_block_id: BasicBlockId,
/// Vec of (from_block, return_value) for expr result PHI generation
pub exit_phi_inputs: Vec<(BasicBlockId, ValueId)>,
/// Map of carrier_name → Vec of (from_block, exit_value) for carrier PHI generation
pub carrier_inputs: std::collections::BTreeMap<String, Vec<(BasicBlockId, ValueId)>>,
}
/// Phase 4: Merge ALL functions and rewrite instructions
///
/// Returns:
/// - exit_block_id: The ID of the exit block where all Returns jump to
/// - exit_phi_inputs: Vec of (from_block, return_value) for exit PHI generation
/// - MergeResult containing exit_block_id, exit_phi_inputs, and carrier_inputs
pub(super) fn merge_and_rewrite(
builder: &mut crate::mir::builder::MirBuilder,
mir_module: &MirModule,
@ -23,7 +34,7 @@ pub(super) fn merge_and_rewrite(
function_params: &HashMap<String, Vec<ValueId>>,
boundary: Option<&JoinInlineBoundary>,
debug: bool,
) -> Result<(BasicBlockId, Vec<(BasicBlockId, ValueId)>), String> {
) -> Result<MergeResult, String> {
// Create exit block for Return conversion (single for all functions)
let exit_block_id = builder.block_gen.next();
if debug {
@ -38,6 +49,11 @@ pub(super) fn merge_and_rewrite(
// Phase 189-Fix: Collect return values from JoinIR functions for exit PHI
let mut exit_phi_inputs: Vec<(BasicBlockId, ValueId)> = Vec::new();
// Phase 33-13: Collect carrier exit values for carrier PHIs
// Map from carrier_name to Vec of (from_block, exit_value)
let mut carrier_inputs: std::collections::BTreeMap<String, Vec<(BasicBlockId, ValueId)>> =
std::collections::BTreeMap::new();
// Build function_entry_map for Call→Jump conversion
let mut function_entry_map: HashMap<String, BasicBlockId> = HashMap::new();
for (func_name, func) in &mir_module.functions {
@ -314,6 +330,7 @@ pub(super) fn merge_and_rewrite(
// Convert Return to Jump to exit block
// All functions return to same exit block (Phase 189)
// Phase 189-Fix: Add Copy instruction to pass return value to exit PHI
// Phase 33-14: Only add to exit_phi_inputs if boundary.expr_result is Some
if let Some(ret_val) = value {
let remapped_val = remapper.get_value(*ret_val).unwrap_or(*ret_val);
if debug {
@ -322,9 +339,38 @@ pub(super) fn merge_and_rewrite(
remapped_val
);
}
// Phase 33-14: Only collect for exit PHI if this loop has an expr result
// This separates "loop as expression" from "carrier-only loop"
let has_expr_result = boundary.map(|b| b.expr_result.is_some()).unwrap_or(true);
if has_expr_result {
// Collect (from_block, return_value) for exit PHI generation
exit_phi_inputs.push((new_block_id, remapped_val));
} else if debug {
eprintln!(
"[cf_loop/joinir] Phase 33-14: Skipping exit_phi_inputs (carrier-only pattern)"
);
}
}
// Phase 33-13: Collect carrier exit values for carrier PHIs
// When jumping to exit_block, collect each carrier's exit value
if let Some(b) = boundary {
for binding in &b.exit_bindings {
if let Some(remapped_exit) = remapper.get_value(binding.join_exit_value) {
carrier_inputs
.entry(binding.carrier_name.clone())
.or_insert_with(Vec::new)
.push((new_block_id, remapped_exit));
if debug {
eprintln!(
"[cf_loop/joinir] Phase 33-13: Carrier '{}' exit: ({:?}, {:?})",
binding.carrier_name, new_block_id, remapped_exit
);
}
}
}
}
MirInstruction::Jump {
target: exit_block_id,
}
@ -429,5 +475,9 @@ pub(super) fn merge_and_rewrite(
}
}
Ok((exit_block_id, exit_phi_inputs))
Ok(MergeResult {
exit_block_id,
exit_phi_inputs,
carrier_inputs,
})
}

17
src/mir/builder/control_flow/joinir/merge/mod.rs
View File

@ -106,7 +106,7 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
remap_values(builder, &used_values, &mut remapper, debug)?;
// Phase 4: Merge blocks and rewrite instructions
let (exit_block_id, exit_phi_inputs) = instruction_rewriter::merge_and_rewrite(
let merge_result = instruction_rewriter::merge_and_rewrite(
builder,
mir_module,
&mut remapper,
@ -116,21 +116,26 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
debug,
)?;
// Phase 5: Build exit PHI
let exit_phi_result_id = exit_phi_builder::build_exit_phi(
// Phase 5: Build exit PHI (expr result and carrier PHIs)
// Phase 33-13: Now also builds carrier PHIs and returns their mapping
let (exit_phi_result_id, carrier_phis) = exit_phi_builder::build_exit_phi(
builder,
exit_block_id,
&exit_phi_inputs,
merge_result.exit_block_id,
&merge_result.exit_phi_inputs,
&merge_result.carrier_inputs,
debug,
)?;
// Phase 6: Reconnect boundary (if specified)
// Phase 197-B: Pass remapper to enable per-carrier exit value lookup
// Phase 33-10-Refactor-P3: Delegate to ExitLineOrchestrator
// Phase 33-13: Pass carrier_phis for proper variable_map update
if let Some(boundary) = boundary {
exit_line::ExitLineOrchestrator::execute(builder, boundary, &remapper, debug)?;
exit_line::ExitLineOrchestrator::execute(builder, boundary, &carrier_phis, debug)?;
}
let exit_block_id = merge_result.exit_block_id;
// Jump from current block to entry function's entry block
let (entry_func_name, entry_func) = mir_module
.functions

2
src/mir/builder/control_flow/joinir/patterns/exit_binding.rs
View File

@ -387,6 +387,8 @@ mod tests {
join_outputs: vec![],
exit_bindings: vec![], // Phase 171: Add missing field
condition_inputs: vec![], // Phase 171: Add missing field
condition_bindings: vec![], // Phase 171-fix: Add missing field
expr_result: None, // Phase 33-14: Add missing field
};
builder.apply_to_boundary(&mut boundary)

9
src/mir/builder/control_flow/joinir/patterns/pattern2_with_break.rs
View File

@ -142,8 +142,8 @@ impl MirBuilder {
};
// Phase 169 / Phase 171-fix / Phase 172-3: Call Pattern 2 lowerer with ConditionEnv
// Now returns (JoinModule, ExitMeta) for proper exit_bindings construction
let (join_module, exit_meta) = match lower_loop_with_break_minimal(scope, condition, &env, &loop_var_name) {
// Phase 33-14: Now returns (JoinModule, JoinFragmentMeta) for expr_result + carrier separation
let (join_module, fragment_meta) = match lower_loop_with_break_minimal(scope, condition, &env, &loop_var_name) {
Ok((module, meta)) => (module, meta),
Err(e) => {
// Phase 195: Use unified trace
@ -152,6 +152,9 @@ impl MirBuilder {
}
};
// Phase 33-14: Extract exit_meta from fragment_meta for backward compatibility
let exit_meta = &fragment_meta.exit_meta;
// Phase 195: Use unified trace
trace::trace().joinir_stats(
"pattern2",
@ -186,12 +189,14 @@ impl MirBuilder {
let exit_bindings = ExitMetaCollector::collect(self, &exit_meta, debug);
// Phase 172-3: Build boundary with both condition_bindings and exit_bindings
// Phase 33-14: Set expr_result from fragment_meta
let mut boundary = crate::mir::join_ir::lowering::inline_boundary::JoinInlineBoundary::new_inputs_only(
vec![ValueId(0)], // JoinIR's main() parameter (loop variable init)
vec![loop_var_id], // Host's loop variable
);
boundary.condition_bindings = condition_bindings;
boundary.exit_bindings = exit_bindings.clone();
boundary.expr_result = fragment_meta.expr_result; // Phase 33-14: Pass expr_result to merger
// Phase 189: Capture exit PHI result (now used for reconnect)
let _ = self.merge_joinir_mir_blocks(&mir_module, Some(&boundary), debug)?;

1
src/mir/builder/control_flow/joinir/routing.rs
View File

@ -75,6 +75,7 @@ impl MirBuilder {
// Phase 170-A-1: Test methods (simplified versions)
"TrimTest.trim/1" => true,
"Main.trim/1" => true, // Phase 171-fix: Main box variant
"Main.trim_string_simple/1" => true, // Phase 33-13: Simple trim variant
_ => false,
};

109
src/mir/join_ir/lowering/carrier_info.rs
View File

@ -206,6 +206,115 @@ pub struct ExitMeta {
pub exit_values: Vec<(String, ValueId)>,
}
/// Phase 33-14: JoinFragmentMeta - Distinguishes expr result from carrier updates
///
/// ## Purpose
///
/// Separates two distinct use cases for JoinIR loops:
///
/// 1. **Expr Result Pattern** (joinir_min_loop.hako):
/// ```nyash
/// local result = loop(...) { ... } // Loop used as expression
/// return result
/// ```
/// Here, the k_exit return value is the "expr result" that should go to exit_phi_inputs.
///
/// 2. **Carrier Update Pattern** (trim pattern):
/// ```nyash
/// loop(...) { start = start + 1 } // Loop used for side effects
/// print(start) // Use carrier after loop
/// ```
/// Here, there's no "expr result" - only carrier variable updates.
///
/// ## SSA Correctness
///
/// Previously, exit_phi_inputs mixed expr results with carrier updates, causing:
/// - PHI inputs that referenced undefined remapped values
/// - SSA-undef errors in VM execution
///
/// With JoinFragmentMeta:
/// - `expr_result`: Only goes to exit_phi_inputs (generates PHI for expr value)
/// - `exit_meta`: Only goes to carrier_inputs (updates variable_map via carrier PHIs)
///
/// ## Example: Pattern 2 (joinir_min_loop.hako)
///
/// ```rust
/// JoinFragmentMeta {
/// expr_result: Some(i_exit), // k_exit returns i as expr value
/// exit_meta: ExitMeta::single("i".to_string(), i_exit), // Also a carrier
/// }
/// ```
///
/// ## Example: Pattern 3 (trim pattern)
///
/// ```rust
/// JoinFragmentMeta {
/// expr_result: None, // Loop doesn't return a value
/// exit_meta: ExitMeta::multiple(vec![
/// ("start".to_string(), start_exit),
/// ("end".to_string(), end_exit),
/// ]),
/// }
/// ```
#[derive(Debug, Clone)]
pub struct JoinFragmentMeta {
/// Expression result ValueId from k_exit (JoinIR-local)
///
/// - `Some(vid)`: Loop is used as expression, k_exit's return value → exit_phi_inputs
/// - `None`: Loop is used for side effects only, no PHI for expr value
pub expr_result: Option<ValueId>,
/// Carrier variable exit bindings (existing ExitMeta)
///
/// Maps carrier names to their JoinIR-local exit values.
/// These go to carrier_inputs for carrier PHI generation.
pub exit_meta: ExitMeta,
}
impl JoinFragmentMeta {
/// Create JoinFragmentMeta for expression result pattern
///
/// Use when the loop returns a value (like `return loop(...)`).
pub fn with_expr_result(expr_result: ValueId, exit_meta: ExitMeta) -> Self {
Self {
expr_result: Some(expr_result),
exit_meta,
}
}
/// Create JoinFragmentMeta for carrier-only pattern
///
/// Use when the loop only updates carriers (like trim pattern).
pub fn carrier_only(exit_meta: ExitMeta) -> Self {
Self {
expr_result: None,
exit_meta,
}
}
/// Create empty JoinFragmentMeta (no expr result, no carriers)
pub fn empty() -> Self {
Self {
expr_result: None,
exit_meta: ExitMeta::empty(),
}
}
/// Check if this fragment has an expression result
pub fn has_expr_result(&self) -> bool {
self.expr_result.is_some()
}
/// Phase 33-14: Backward compatibility - convert to ExitMeta
///
/// During migration, some code may still expect ExitMeta.
/// This extracts just the carrier bindings.
#[deprecated(since = "33-14", note = "Use exit_meta directly for carrier access")]
pub fn to_exit_meta(&self) -> ExitMeta {
self.exit_meta.clone()
}
}
impl ExitMeta {
/// Create new ExitMeta with no exit values
pub fn empty() -> Self {

34
src/mir/join_ir/lowering/inline_boundary.rs
View File

@ -205,6 +205,33 @@ pub struct JoinInlineBoundary {
///
/// This replaces `condition_inputs` to ensure proper ValueId separation.
pub condition_bindings: Vec<super::condition_to_joinir::ConditionBinding>,
/// Phase 33-14: Expression result ValueId (JoinIR-local)
///
/// If the loop is used as an expression (like `return loop(...)`), this field
/// contains the JoinIR-local ValueId of k_exit's return value.
///
/// - `Some(ValueId)`: Loop returns a value → k_exit return goes to exit_phi_inputs
/// - `None`: Loop only updates carriers → no exit_phi_inputs generation
///
/// # Example: joinir_min_loop.hako (expr result pattern)
///
/// ```nyash
/// loop(i < 3) { if (i >= 2) { break } i = i + 1 }
/// return i
/// ```
///
/// Here, `expr_result = Some(i_exit)` because the loop's result is used.
///
/// # Example: trim pattern (carrier-only)
///
/// ```nyash
/// loop(start < end) { start = start + 1 }
/// print(start) // Uses carrier after loop
/// ```
///
/// Here, `expr_result = None` because the loop doesn't return a value.
pub expr_result: Option<crate::mir::ValueId>,
}
impl JoinInlineBoundary {
@ -229,6 +256,7 @@ impl JoinInlineBoundary {
#[allow(deprecated)]
condition_inputs: vec![], // Phase 171: Default to empty (deprecated)
condition_bindings: vec![], // Phase 171-fix: Default to empty
expr_result: None, // Phase 33-14: Default to carrier-only pattern
}
}
@ -268,6 +296,7 @@ impl JoinInlineBoundary {
#[allow(deprecated)]
condition_inputs: vec![], // Phase 171: Default to empty (deprecated)
condition_bindings: vec![], // Phase 171-fix: Default to empty
expr_result: None, // Phase 33-14
}
}
@ -303,6 +332,7 @@ impl JoinInlineBoundary {
#[allow(deprecated)]
condition_inputs: vec![], // Phase 171: Default to empty (deprecated)
condition_bindings: vec![], // Phase 171-fix: Default to empty
expr_result: None, // Phase 33-14
}
}
@ -360,6 +390,7 @@ impl JoinInlineBoundary {
#[allow(deprecated)]
condition_inputs: vec![], // Phase 171: Default to empty (deprecated)
condition_bindings: vec![], // Phase 171-fix: Default to empty
expr_result: None, // Phase 33-14
}
}
@ -403,6 +434,7 @@ impl JoinInlineBoundary {
#[allow(deprecated)]
condition_inputs,
condition_bindings: vec![], // Phase 171-fix: Will be populated by new constructor
expr_result: None, // Phase 33-14
}
}
@ -450,6 +482,7 @@ impl JoinInlineBoundary {
#[allow(deprecated)]
condition_inputs,
condition_bindings: vec![], // Phase 171-fix: Will be populated by new constructor
expr_result: None, // Phase 33-14
}
}
@ -504,6 +537,7 @@ impl JoinInlineBoundary {
#[allow(deprecated)]
condition_inputs: vec![], // Deprecated, use condition_bindings instead
condition_bindings,
expr_result: None, // Phase 33-14
}
}
}

18
src/mir/join_ir/lowering/loop_with_break_minimal.rs
View File

@ -56,7 +56,7 @@
//! Following the "80/20 rule" from CLAUDE.md - get it working first, generalize later.
use crate::ast::ASTNode;
use crate::mir::join_ir::lowering::carrier_info::ExitMeta;
use crate::mir::join_ir::lowering::carrier_info::{ExitMeta, JoinFragmentMeta};
use crate::mir::join_ir::lowering::condition_to_joinir::{lower_condition_to_joinir, ConditionEnv};
use crate::mir::join_ir::lowering::loop_scope_shape::LoopScopeShape;
use crate::mir::join_ir::{
@ -109,9 +109,11 @@ use crate::mir::ValueId;
/// This ensures JoinIR never accesses HOST ValueIds directly.
///
/// # Phase 172-3: ExitMeta Return
/// # Phase 33-14: JoinFragmentMeta Return
///
/// Returns `(JoinModule, ExitMeta)` where ExitMeta contains the JoinIR-local ValueId
/// of the k_exit parameter. This allows the caller to build proper exit_bindings.
/// Returns `(JoinModule, JoinFragmentMeta)` where:
/// - `expr_result`: k_exit's return value (i_exit) - this is what `return i` uses
/// - `exit_meta`: carrier bindings for variable_map updates
///
/// # Arguments
///
@ -121,7 +123,7 @@ pub fn lower_loop_with_break_minimal(
condition: &ASTNode,
env: &ConditionEnv,
loop_var_name: &str,
) -> Result<(JoinModule, ExitMeta), String> {
) -> Result<(JoinModule, JoinFragmentMeta), String> {
// Phase 188-Impl-2: Use local ValueId allocator (sequential from 0)
// JoinIR has NO knowledge of host ValueIds - boundary handled separately
let mut value_counter = 0u32;
@ -305,9 +307,11 @@ pub fn lower_loop_with_break_minimal(
eprintln!("[joinir/pattern2] Condition from AST (not hardcoded)");
eprintln!("[joinir/pattern2] Exit PHI: k_exit receives i from both natural exit and break");
// Phase 172-3: Build ExitMeta with k_exit parameter's ValueId
// Phase 172-3 → Phase 33-14: Build JoinFragmentMeta with expr_result
// Pattern 2: Loop is used as expression → `return i` means k_exit's return is expr_result
let exit_meta = ExitMeta::single(loop_var_name.to_string(), i_exit);
eprintln!("[joinir/pattern2] Phase 172-3: ExitMeta {{ {} → {:?} }}", loop_var_name, i_exit);
let fragment_meta = JoinFragmentMeta::with_expr_result(i_exit, exit_meta);
eprintln!("[joinir/pattern2] Phase 33-14: JoinFragmentMeta {{ expr_result: {:?}, carrier: {} }}", i_exit, loop_var_name);
Ok((join_module, exit_meta))
Ok((join_module, fragment_meta))
}