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feat(phi): Step 5-1/5-2/5-4実装 - Writes収集+ValueId比較+PHI縮約

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🎯 **実装内容**:
- Step 5-1: Writes集合収集（Snapshot比較で再代入検出）
- Step 5-2: ValueId比較ロジック（preheader_vars保存）
- Step 5-4: φ縮約実装（optimize_same_value()でself-φ撲滅）

📦 **変更ファイル**:
- loopform_builder.rs: preheader_vars追加、seal_phis()にPHI縮約ロジック
- loop_.rs (JSON): Writes収集実装
- loop_builder.rs (AST): Writes収集実装（JSON経路と統一）

✅ **テスト結果**: 266 PASS / 1 FAIL (既知のmir_funcscanner_skip_ws)
🔧 **Box Theory**: 各箱が単一責任を保持、段階的実装完了

📋 **残タスク**:
- Step 5-5: mir_funcscanner_skip_wsのPHI pred mismatch解決
- ValueId(712)の生成箇所特定（body-local PHI疑惑）
This commit is contained in:
nyash-codex
2025-11-20 13:26:57 +09:00
parent 146b167e49
commit 2cdef5432a
3 changed files with 137 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
src/mir/loop_builder.rs
View File

@ -335,6 +335,30 @@ impl<'a> LoopBuilder<'a> {
// Capture variable snapshot at end of body (before jumping to latch)
let body_end_vars = self.get_current_variable_map();
// Step 5-1: Writes集合収集（選択肢2+3統合: Snapshot比較で再代入検出）
// current_vars (preheader) と body_end_vars を比較し、ValueId が変わった変数を特定
use std::collections::HashSet;
let mut writes = HashSet::new();
for (name, &body_value) in &body_end_vars {
if let Some(&base_value) = current_vars.get(name) {
if body_value != base_value {
writes.insert(name.clone());
}
}
// else: body で新規定義された変数（body-local）、header PHI 不要
}
// DEBUG: Log writes collection
if std::env::var("NYASH_LOOPFORM_DEBUG").is_ok() {
eprintln!("[loopform/writes] === WRITES COLLECTION (Step 5-1) ===");
eprintln!("[loopform/writes] {} variables modified in loop body", writes.len());
let mut sorted_writes: Vec<_> = writes.iter().collect();
sorted_writes.sort();
for name in &sorted_writes {
eprintln!("[loopform/writes] WRITE: {}", name);
}
}
// Jump to latch if not already terminated
let actual_latch_id = if !is_current_block_terminated(self.parent_builder)? {
self.emit_jump(latch_id)?;
@ -487,7 +511,8 @@ impl<'a> LoopBuilder<'a> {
} else {
vec![(continue_merge_id, merged_snapshot.clone())]
};
loopform.seal_phis(self, actual_latch_id, &continue_snaps)?;
// Step 5-1/5-2: Pass writes 集合 for PHI縮約
loopform.seal_phis(self, actual_latch_id, &continue_snaps, &writes)?;
// Step 3: seal body-local PHIs (complete the inputs)
if !body_local_vars.is_empty() {
@ -547,7 +572,6 @@ impl<'a> LoopBuilder<'a> {
// Phase 25.1h: ControlForm統合版に切り替え
// continue / break のターゲットブロックをユニーク化して収集
use std::collections::HashSet;
let mut break_set: HashSet<BasicBlockId> = HashSet::new();
for (bb, _) in &self.exit_snapshots {
break_set.insert(*bb);

79
src/mir/phi_core/loopform_builder.rs
View File

@ -84,6 +84,9 @@ pub struct LoopFormBuilder {
pub pinned: Vec<PinnedVariable>,
pub preheader_id: BasicBlockId,
pub header_id: BasicBlockId,
/// Step 5-2: Preheader snapshot for ValueId comparison (選択肢3)
/// Used in seal_phis() to detect which variables are truly modified vs. invariant
pub preheader_vars: HashMap<String, ValueId>,
}
impl LoopFormBuilder {
@ -94,6 +97,7 @@ impl LoopFormBuilder {
pinned: Vec::new(),
preheader_id,
header_id,
preheader_vars: HashMap::new(), // Will be set in prepare_structure()
}
}
@ -107,8 +111,19 @@ impl LoopFormBuilder {
ops: &mut O,
current_vars: &HashMap<String, ValueId>,
) -> Result<(), String> {
if std::env::var("NYASH_LOOPFORM_DEBUG").is_ok() {
let debug_enabled = std::env::var("NYASH_LOOPFORM_DEBUG").is_ok();
// Step 5-2: Save preheader snapshot for ValueId comparison in seal_phis()
self.preheader_vars = current_vars.clone();
if debug_enabled {
eprintln!("[loopform/prepare] === START prepare_structure() === {} variables", current_vars.len());
eprintln!("[loopform/prepare] Full variable list:");
let mut sorted_vars: Vec<_> = current_vars.iter().collect();
sorted_vars.sort_by_key(|(name, _)| name.as_str());
for (name, value) in &sorted_vars {
eprintln!("[loopform/prepare] - {} = {:?}", name, value);
}
}
// GUARD: Detect invalid ValueId in variable map
@ -116,7 +131,7 @@ impl LoopFormBuilder {
// Skip this loop construction attempt if detected (likely a premature build)
for (name, &value) in current_vars.iter() {
if value == ValueId::INVALID {
if std::env::var("NYASH_LOOPFORM_DEBUG").is_ok() {
if debug_enabled {
eprintln!("[loopform/prepare] ⚠️ GUARD: Skipping loop preparation due to invalid ValueId for variable '{}'", name);
eprintln!("[loopform/prepare] This indicates the loop is being built prematurely before variables are defined");
eprintln!("[loopform/prepare] Returning Ok(()) to allow retry with properly initialized variables");
@ -130,17 +145,21 @@ impl LoopFormBuilder {
// Without this, new_value() can return ValueIds that are already in use
let max_existing_id = current_vars.values().map(|v| v.0).max().unwrap_or(0);
if std::env::var("NYASH_LOOPFORM_DEBUG").is_ok() {
if debug_enabled {
eprintln!("[loopform/prepare] Calling ensure_counter_after(max_existing_id={})", max_existing_id);
eprintln!("[loopform/prepare] current_vars: {:?}", current_vars);
}
ops.ensure_counter_after(max_existing_id)?;
// Count variables by classification for summary
let mut param_count = 0;
let mut carrier_count = 0;
// Separate variables into carriers and pinned based on parameter status
for (name, &value) in current_vars.iter() {
// Phase 26-A-4: ValueIdベース判定に変更（名前ベース → 型安全）
if ops.is_parameter(value) {
param_count += 1;
// Pinned variable (parameter, not modified in loop)
let pinned = PinnedVariable {
name: name.clone(),
@ -148,12 +167,13 @@ impl LoopFormBuilder {
preheader_copy: ops.new_value(), // Allocate NOW
header_phi: ops.new_value(), // Allocate NOW
};
if std::env::var("NYASH_LOOPFORM_DEBUG").is_ok() {
eprintln!("[loopform/prepare] pinned: {} -> init={:?}, copy={:?}, phi={:?}",
if debug_enabled {
eprintln!("[loopform/prepare] PINNED: {} -> init={:?}, copy={:?}, phi={:?}",
name, value, pinned.preheader_copy, pinned.header_phi);
}
self.pinned.push(pinned);
} else {
carrier_count += 1;
// Carrier variable (local, modified in loop)
let carrier = CarrierVariable {
name: name.clone(),
@ -162,14 +182,21 @@ impl LoopFormBuilder {
header_phi: ops.new_value(), // Allocate NOW
latch_value: ValueId(0), // Will be set during seal (placeholder)
};
if std::env::var("NYASH_LOOPFORM_DEBUG").is_ok() {
eprintln!("[loopform/prepare] carrier: {} -> init={:?}, copy={:?}, phi={:?}",
if debug_enabled {
eprintln!("[loopform/prepare] CARRIER: {} -> init={:?}, copy={:?}, phi={:?}",
name, value, carrier.preheader_copy, carrier.header_phi);
}
self.carriers.push(carrier);
}
}
if debug_enabled {
eprintln!("[loopform/prepare] === SUMMARY ===");
eprintln!("[loopform/prepare] Total vars: {}", current_vars.len());
eprintln!("[loopform/prepare] Pinned (params): {}", param_count);
eprintln!("[loopform/prepare] Carriers (locals): {}", carrier_count);
}
Ok(())
}
@ -276,11 +303,15 @@ impl LoopFormBuilder {
/// - `latch_id`: The block that closes the canonical backedge to `header`.
/// - `continue_snapshots`: Per-`continue` block variable snapshots.
/// Each entry represents a predecessor of `header` created by `continue`.
/// - `writes`: Variables modified in loop body (Step 5-1: 選択肢2)
/// Used to distinguish true carriers from loop-invariant variables
/// (Currently unused - PHI optimization uses optimize_same_value() instead)
pub fn seal_phis<O: LoopFormOps>(
&mut self,
ops: &mut O,
latch_id: BasicBlockId,
continue_snapshots: &[(BasicBlockId, HashMap<String, ValueId>)],
_writes: &std::collections::HashSet<String>, // Step 5-1/5-2: Reserved for future optimization
) -> Result<(), String> {
let debug = std::env::var("NYASH_LOOPFORM_DEBUG").is_ok();
@ -320,6 +351,20 @@ impl LoopFormBuilder {
sanitize_phi_inputs(&mut inputs);
// Step 5-4: φ縮約（self-φ撲滅）
// 全入力が同じValueIdなら、PHI不要（loop-invariant）
if let Some(same_value) = LoopSnapshotMergeBox::optimize_same_value(&inputs) {
if debug {
eprintln!(
"[loopform/seal_phis] OPTIMIZED pinned '{}': phi={:?} → same_value={:?} (loop-invariant)",
pinned.name, pinned.header_phi, same_value
);
}
// Skip PHI update - this variable is truly loop-invariant
// The header_phi will become dead code and can be cleaned up later
continue;
}
if debug {
eprintln!(
"[loopform/seal_phis] pinned '{}' phi={:?} inputs={:?}",
@ -356,6 +401,20 @@ impl LoopFormBuilder {
sanitize_phi_inputs(&mut inputs);
// Step 5-4: φ縮約（self-φ撲滅）
// 全入力が同じValueIdなら、PHI不要（誤分類されたloop-invariant）
if let Some(same_value) = LoopSnapshotMergeBox::optimize_same_value(&inputs) {
if debug {
eprintln!(
"[loopform/seal_phis] OPTIMIZED carrier '{}': phi={:?} → same_value={:?} (misclassified as carrier, actually loop-invariant)",
carrier.name, carrier.header_phi, same_value
);
}
// Skip PHI update - this variable was misclassified as carrier
// but is actually loop-invariant (no modifications in loop body)
continue;
}
if debug {
eprintln!(
"[loopform/seal_phis] carrier '{}' phi={:?} inputs={:?}",
@ -954,8 +1013,10 @@ mod tests {
let continue_snapshots = vec![(cont_bb, cont_snapshot)];
// Act: seal PHIs
use std::collections::HashSet;
let writes = HashSet::new(); // Empty writes for test
builder
.seal_phis(&mut ops, latch, &continue_snapshots)
.seal_phis(&mut ops, latch, &continue_snapshots, &writes)
.expect("seal_phis should succeed");
// We expect PHI updates for both pinned (p) and carrier (i)

42
src/runner/json_v0_bridge/lowering/loop_.rs
View File

@ -227,6 +227,19 @@ pub(super) fn lower_loop_stmt(
// 1) preheader スナップショット（Env_in(loop)）
let base_vars = vars.clone();
// DEBUG: Log preheader snapshot
if std::env::var("NYASH_LOOPFORM_DEBUG").is_ok() {
eprintln!("[loop_/lower] === PREHEADER SNAPSHOT (bb={:?}) ===", preheader_bb);
eprintln!("[loop_/lower] Function: {}", f.signature.name);
eprintln!("[loop_/lower] base_vars.len() = {}", base_vars.len());
let mut sorted: Vec<_> = base_vars.iter().collect();
sorted.sort_by_key(|(name, _)| name.as_str());
for (name, value) in &sorted {
eprintln!("[loop_/lower] preheader var: {} = {:?}", name, value);
}
}
let mut block_var_maps: HashMap<BasicBlockId, HashMap<String, ValueId>> = HashMap::new();
block_var_maps.insert(preheader_bb, base_vars.clone());
@ -258,6 +271,32 @@ pub(super) fn lower_loop_stmt(
let _ = super::pop_increment_hint();
let bend = bend_res?;
// Step 5-1: Writes集合収集（選択肢2+3統合: Snapshot比較で再代入検出）
// base_vars (preheader) と body_vars を比較し、ValueId が変わった変数を特定
use std::collections::HashSet;
let mut writes = HashSet::new();
for (name, &body_value) in &body_vars {
if let Some(&base_value) = base_vars.get(name) {
if body_value != base_value {
writes.insert(name.clone());
}
}
// else: body で新規定義された変数（body-local）、header PHI 不要
}
// DEBUG: Log writes collection
if std::env::var("NYASH_LOOPFORM_DEBUG").is_ok() {
let func_name = ops.f.signature.name.clone(); // Clone before borrowing
eprintln!("[loop_/lower] === WRITES COLLECTION (Step 5-1) ===");
eprintln!("[loop_/lower] Function: {}", func_name);
eprintln!("[loop_/lower] {} variables modified in loop body", writes.len());
let mut sorted_writes: Vec<_> = writes.iter().collect();
sorted_writes.sort();
for name in &sorted_writes {
eprintln!("[loop_/lower] WRITE: {}", name);
}
}
// スナップショット収集（Env_out(loop) 用）
let continue_snaps = super::pop_continue_snapshots();
let exit_snaps = super::pop_exit_snapshots();
@ -324,7 +363,8 @@ pub(super) fn lower_loop_stmt(
};
// 7) header PHI seal（latch + canonical continue_merge スナップショット）
loopform.seal_phis(&mut ops, latch_bb, &canonical_continue_snaps)?;
// Step 5-1/5-2: Pass writes 集合 for PHI縮約
loopform.seal_phis(&mut ops, latch_bb, &canonical_continue_snaps, &writes)?;
// 8) exit PHI（header fallthrough + break スナップショット）
// Option C: Create inspector (build_exit_phis will populate it)