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refactor(joinir): Move Trim logic from Pattern2 to TrimLoopLowerer

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Phase 180-3: Extract Pattern2 Trim/P5 logic to dedicated module

Changes:
- Pattern2: Delegated Trim processing to TrimLoopLowerer (~160 lines removed)
- Pattern2: Simplified to ~25 lines of delegation code
- TrimLoopLowerer: Implemented full logic from Pattern2 (lines 180-340)
- Net reduction: -135 lines in Pattern2 (371 lines total)

Implementation:
- LoopConditionScopeBox + LoopBodyCarrierPromoter integration
- Carrier initialization code generation (substring + whitespace check)
- Trim break condition replacement (!is_carrier)
- ConditionEnv bindings setup (carrier + original variable)

Testing:
- cargo build --release: SUCCESS (0 errors, warnings only)
- All existing Pattern2 tests: PASS
- No behavior changes, refactoring only
This commit is contained in:
nyash-codex
2025-12-08 21:07:39 +09:00
parent 2bbee79adf
commit b6ed6295a3
5 changed files with 442 additions and 414 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
src/mir/builder/control_flow/joinir/patterns/mod.rs
View File

@ -51,6 +51,7 @@ pub(in crate::mir::builder) mod pattern3_with_if_phi;
pub(in crate::mir::builder) mod pattern4_carrier_analyzer;
pub(in crate::mir::builder) mod pattern4_with_continue;
pub(in crate::mir::builder) mod router;
pub(in crate::mir::builder) mod trim_loop_lowering; // Phase 180: Dedicated Trim/P5 lowering module
pub(in crate::mir::builder) mod trim_pattern_validator;
pub(in crate::mir::builder) mod trim_pattern_lowerer;

217
src/mir/builder/control_flow/joinir/patterns/pattern2_with_break.rs
View File

@ -4,8 +4,6 @@ use crate::ast::ASTNode;
use crate::mir::builder::MirBuilder;
use crate::mir::ValueId;
use super::super::trace;
use super::trim_pattern_validator::TrimPatternValidator;
use super::trim_pattern_lowerer::TrimPatternLowerer;
/// Phase 194: Detection function for Pattern 2
///
@ -177,202 +175,37 @@ impl MirBuilder {
break_condition_raw.clone()
};
// Phase 171-C-3: LoopBodyCarrierPromoter integration
// Check if LoopConditionScopeBox detects LoopBodyLocal variables, and attempt promotion
{
use crate::mir::loop_pattern_detection::loop_condition_scope::LoopConditionScopeBox;
use crate::mir::loop_pattern_detection::loop_body_carrier_promoter::{
LoopBodyCarrierPromoter, PromotionRequest, PromotionResult,
};
// Phase 180-3: Delegate Trim/P5 processing to TrimLoopLowerer
let effective_break_condition = if let Some(trim_result) = super::trim_loop_lowering::TrimLoopLowerer::try_lower_trim_like_loop(
self,
&scope,
condition,
&break_condition_node,
_body,
&loop_var_name,
&mut carrier_info,
&mut alloc_join_value,
)? {
// Trim pattern detected and lowered
eprintln!("[pattern2/trim] TrimLoopLowerer processed Trim pattern successfully");
// First check: Does the condition reference LoopBodyLocal variables?
let cond_scope = LoopConditionScopeBox::analyze(
&loop_var_name,
&[condition, &break_condition_node],
Some(&scope),
);
// Update carrier_info from result
carrier_info = trim_result.carrier_info;
eprintln!("[pattern2/check] Analyzing condition scope: {} variables", cond_scope.vars.len());
for var in &cond_scope.vars {
eprintln!("[pattern2/check] '{}': {:?}", var.name, var.scope);
// Extend condition_bindings with Trim bindings
condition_bindings.extend(trim_result.condition_bindings.iter().cloned());
// Add bindings to env for JoinIR
for binding in &trim_result.condition_bindings {
env.insert(binding.name.clone(), binding.join_value);
}
eprintln!("[pattern2/check] has_loop_body_local() = {}", cond_scope.has_loop_body_local());
if cond_scope.has_loop_body_local() {
eprintln!("[pattern2/promotion] LoopBodyLocal detected in condition scope");
eprintln!("[pattern2/trim] Extended condition_bindings with {} Trim bindings", trim_result.condition_bindings.len());
// Phase 171-C-3: Try promotion
let request = PromotionRequest {
scope: &scope,
cond_scope: &cond_scope,
break_cond: Some(&break_condition_node),
loop_body: _body,
};
match LoopBodyCarrierPromoter::try_promote(&request) {
PromotionResult::Promoted { trim_info } => {
eprintln!(
"[pattern2/promoter] LoopBodyLocal '{}' promoted to carrier '{}'",
trim_info.var_name, trim_info.carrier_name
);
// Phase 171-C-4: Convert to CarrierInfo and merge
let promoted_carrier = trim_info.to_carrier_info();
eprintln!(
"[pattern2/promoter] Phase 171-C-4 DEBUG: BEFORE merge - carrier_info.loop_var_name='{}'",
carrier_info.loop_var_name
);
eprintln!(
"[pattern2/promoter] Phase 171-C-4 DEBUG: promoted_carrier.loop_var_name='{}'",
promoted_carrier.loop_var_name
);
carrier_info.merge_from(&promoted_carrier);
eprintln!(
"[pattern2/promoter] Phase 171-C-4 DEBUG: AFTER merge - carrier_info.loop_var_name='{}'",
carrier_info.loop_var_name
);
eprintln!(
"[pattern2/promoter] Phase 171-C-4: Merged carrier '{}' into CarrierInfo (total carriers: {})",
trim_info.carrier_name,
carrier_info.carrier_count()
);
// Phase 172: Implement Trim pattern lowering
// Clone helper data to avoid borrow conflicts
let trim_helper_data = carrier_info.trim_helper().map(|h| {
(h.carrier_name.clone(), h.original_var.clone(), h.whitespace_chars.clone(), h.is_safe_trim())
});
if let Some((carrier_name, original_var, whitespace_chars, is_safe)) = trim_helper_data {
if is_safe {
eprintln!("[pattern2/trim] Safe Trim pattern detected, implementing lowering");
eprintln!("[pattern2/trim] Carrier: '{}', original var: '{}', whitespace chars: {:?}",
carrier_name, original_var, whitespace_chars);
// Phase 172-2: Extract substring pattern and generate initial check
let (s_name, start_expr) = TrimPatternValidator::extract_substring_args(_body, &original_var)
.ok_or_else(|| {
format!(
"[cf_loop/pattern2] Failed to extract substring pattern for Trim carrier '{}'",
carrier_name
)
})?;
eprintln!("[pattern2/trim] Extracted substring pattern: s='{}', start={:?}", s_name, start_expr);
// Get ValueIds for string and start
let s_id = self.variable_map.get(&s_name)
.copied()
.ok_or_else(|| format!("[pattern2/trim] String variable '{}' not found", s_name))?;
// Compile start expression to get ValueId
let start_id = self.build_expression_impl(*start_expr)?;
// Generate: start + 1
use crate::mir::builder::emission::constant::emit_integer;
use crate::mir::types::BinaryOp;
use crate::mir::instruction::MirInstruction;
let one = emit_integer(self, 1);
let start_plus_1 = self.value_gen.next();
self.emit_instruction(MirInstruction::BinOp {
dst: start_plus_1,
op: BinaryOp::Add,
lhs: start_id,
rhs: one,
})?;
// Generate: ch0 = s.substring(start, start+1)
let ch0 = self.value_gen.next();
self.emit_method_call(
Some(ch0),
s_id,
"substring".to_string(),
vec![start_id, start_plus_1],
)?;
eprintln!("[pattern2/trim] Generated initial substring call: ch0 = {:?}", ch0);
// Generate: is_ch_match0 = (ch0 == " " || ch0 == "\t" || ...)
let is_ch_match0 = TrimPatternValidator::emit_whitespace_check(self, ch0, &whitespace_chars)?;
eprintln!("[pattern2/trim] Generated initial whitespace check: is_ch_match0 = {:?}", is_ch_match0);
// Register carrier in variable_map
self.variable_map.insert(carrier_name.clone(), is_ch_match0);
eprintln!("[pattern2/trim] Registered carrier '{}' in variable_map", carrier_name);
// Note: DO NOT overwrite carrier_info.loop_var_id/loop_var_name here!
// The loop variable is 'pos' (counter), not 'is_ch_match' (carrier).
// carrier_info.loop_var_name should remain as the original loop variable.
eprintln!("[pattern2/trim] Carrier registered. Loop var='{}' remains unchanged",
carrier_info.loop_var_name);
// Phase 172-4: Break condition will be replaced below after JoinIR generation
eprintln!("[pattern2/trim] Trim pattern lowering enabled, proceeding to JoinIR generation");
} else {
return Err(format!(
"[cf_loop/pattern2] Trim pattern detected but not safe: carrier='{}', whitespace_count={}",
carrier_name,
whitespace_chars.len()
));
}
} else if carrier_info.trim_helper().is_some() {
return Err(format!(
"[cf_loop/pattern2] Promoted but TrimLoopHelper check failed (carrier: '{}')",
trim_info.carrier_name
));
}
}
PromotionResult::CannotPromote { reason, vars } => {
// Phase 171-C-3: Fail-Fast on promotion failure
return Err(format!(
"[cf_loop/pattern2] Cannot promote LoopBodyLocal variables {:?}: {}",
vars, reason
));
}
}
}
}
// Phase 172-4: Replace break condition for Trim pattern and add carrier to ConditionEnv
let effective_break_condition = if let Some(helper) = carrier_info.trim_helper() {
if helper.is_safe_trim() {
// Add carrier to ConditionEnv using TrimPatternLowerer
let get_value = |name: &str| self.variable_map.get(name).copied();
let binding = TrimPatternLowerer::add_to_condition_env(
helper,
get_value,
|name, value| { env.insert(name, value); },
&mut alloc_join_value,
)?;
condition_bindings.push(binding);
eprintln!("[pattern2/trim] Added carrier '{}' to ConditionEnv: HOST {:?} → JoinIR {:?}",
helper.carrier_name, condition_bindings.last().unwrap().host_value, condition_bindings.last().unwrap().join_value);
// Phase 176-6: Also map the original variable name to the same JoinIR ValueId
// This allows the loop body to reference the original variable (e.g., 'ch')
// even though it was promoted to a carrier (e.g., 'is_ch_match')
let join_value = condition_bindings.last().unwrap().join_value;
env.insert(helper.original_var.clone(), join_value);
eprintln!("[pattern2/trim] Phase 176-6: Also mapped original var '{}' → JoinIR {:?}",
helper.original_var, join_value);
// Generate negated carrier check: !is_ch_match
let negated_carrier = TrimPatternLowerer::generate_trim_break_condition(helper);
eprintln!("[pattern2/trim] Replaced break condition with !{}", helper.carrier_name);
negated_carrier
} else {
break_condition_node.clone()
}
// Use Trim break condition
trim_result.condition
} else {
// Not a Trim pattern - use original break condition
break_condition_node.clone()
};

416
src/mir/builder/control_flow/joinir/patterns/trim_loop_lowering.rs Normal file
View File

@ -0,0 +1,416 @@
//! Phase 180: Trim/P5 Dedicated Lowering Module
//!
//! Consolidates all Trim pattern lowering logic from Pattern2/Pattern4.
//! Pattern2/Pattern4 handle generic loop structures, while this module
//! handles Trim/CharComparison (Pattern 5) specific knowledge.
//!
//! ## Responsibilities
//!
//! - Detect Trim-like loops (whitespace skipping patterns)
//! - Promote LoopBodyLocal variables to carriers
//! - Generate carrier initialization code (substring + whitespace check)
//! - Replace break conditions with carrier checks
//! - Setup ConditionEnv bindings for JoinIR
//!
//! ## Design Philosophy
//!
//! Follows Box Theory principles:
//! - **Single Responsibility**: Only handles Trim/P5 lowering logic
//! - **Reusability**: Used by Pattern2, Pattern4, and future patterns
//! - **Testability**: Pure data transformations, easy to unit test
//! - **Fail-Fast**: Returns errors early, no silent fallbacks
//!
//! ## Example Use Case
//!
//! **Original pattern** (Pattern 2 with Trim):
//! ```nyash
//! loop(start < end) {
//! local ch = s.substring(start, start+1)
//! if ch == " " || ch == "\t" { start = start + 1 } else { break }
//! }
//! ```
//!
//! **After TrimLoopLowerer processing**:
//! - LoopBodyLocal `ch` promoted to bool carrier `is_ch_match`
//! - Carrier initialized: `is_ch_match = (s.substring(start, start+1) == " " || ...)`
//! - Break condition replaced: `break on !is_ch_match`
//! - ConditionEnv binding: `ch` → JoinIR ValueId
use crate::ast::ASTNode;
use crate::mir::builder::MirBuilder;
use crate::mir::join_ir::lowering::carrier_info::CarrierInfo;
use crate::mir::join_ir::lowering::condition_env::ConditionBinding;
use crate::mir::join_ir::lowering::loop_scope_shape::LoopScopeShape;
use crate::mir::loop_pattern_detection::loop_body_carrier_promoter::{
LoopBodyCarrierPromoter, PromotionRequest, PromotionResult,
};
use crate::mir::loop_pattern_detection::loop_condition_scope::LoopConditionScopeBox;
use crate::mir::ValueId;
/// Trim pattern lowering orchestrator
///
/// Phase 180: Single entry point for all Trim/P5 lowering operations.
pub struct TrimLoopLowerer;
/// Result of successful Trim lowering preprocessing
///
/// Contains all data needed by Pattern2/4 to complete lowering:
/// - Replaced break condition
/// - Updated carrier info with promoted carrier
/// - Condition environment bindings
/// - Trim helper for pattern-specific operations
pub struct TrimLoweringResult {
/// Replaced break condition (e.g., `!is_carrier`)
///
/// Pattern2/4 will use this instead of the original break condition
pub condition: ASTNode,
/// Updated carrier info with promoted Trim carrier
///
/// Pattern2/4 will use this for JoinIR lowering
pub carrier_info: CarrierInfo,
/// Condition environment bindings for the carrier
///
/// Pattern2/4 will extend their condition_bindings with these
pub condition_bindings: Vec<ConditionBinding>,
}
impl TrimLoopLowerer {
/// Try to lower a Trim-like loop pattern
///
/// Phase 180: Main entry point for Trim pattern detection and lowering.
///
/// # Algorithm
///
/// 1. Check if condition references LoopBodyLocal variables
/// 2. Try to promote LoopBodyLocal to carrier (via LoopBodyCarrierPromoter)
/// 3. If promoted as Trim pattern:
/// - Generate carrier initialization code
/// - Replace break condition with carrier check
/// - Setup ConditionEnv bindings
/// 4. Return TrimLoweringResult with all updates
///
/// # Arguments
///
/// * `builder` - MirBuilder for code generation
/// * `scope` - Loop structure metadata
/// * `loop_cond` - Main loop condition (e.g., `start < end`)
/// * `break_cond` - Break condition from loop body
/// * `body` - Loop body AST nodes
/// * `loop_var_name` - Loop variable name (e.g., "start")
/// * `carrier_info` - Current carrier info (will be updated if Trim pattern)
/// * `alloc_join_value` - JoinIR ValueId allocator closure
///
/// # Returns
///
/// - `Ok(Some(TrimLoweringResult))` - Trim pattern detected and lowered
/// - `Ok(None)` - Not a Trim pattern (normal loop, no action taken)
/// - `Err(String)` - Trim pattern detected but lowering failed
///
/// # Example
///
/// ```ignore
/// if let Some(trim_result) = TrimLoopLowerer::try_lower_trim_like_loop(
/// self,
/// &scope,
/// condition,
/// &break_condition_node,
/// _body,
/// &loop_var_name,
/// &mut carrier_info,
/// &mut alloc_join_value,
/// )? {
/// // Use trim_result.condition, carrier_info, condition_bindings
/// }
/// ```
pub fn try_lower_trim_like_loop(
builder: &mut MirBuilder,
scope: &LoopScopeShape,
loop_cond: &ASTNode,
break_cond: &ASTNode,
body: &[ASTNode],
loop_var_name: &str,
carrier_info: &mut CarrierInfo,
alloc_join_value: &mut dyn FnMut() -> ValueId,
) -> Result<Option<TrimLoweringResult>, String> {
// Phase 180-2: Skeleton implementation
// TODO: Phase 180-3 will implement full logic from Pattern2
// Step 1: Check if condition references LoopBodyLocal variables
let cond_scope = LoopConditionScopeBox::analyze(
loop_var_name,
&[loop_cond, break_cond],
Some(scope),
);
eprintln!(
"[TrimLoopLowerer] Analyzing condition scope: {} variables",
cond_scope.vars.len()
);
if !cond_scope.has_loop_body_local() {
// Not a Trim pattern - normal loop
eprintln!("[TrimLoopLowerer] No LoopBodyLocal detected, skipping Trim lowering");
return Ok(None);
}
eprintln!("[TrimLoopLowerer] LoopBodyLocal detected in condition scope");
// Step 2: Try promotion via LoopBodyCarrierPromoter
let request = PromotionRequest {
scope,
cond_scope: &cond_scope,
break_cond: Some(break_cond),
loop_body: body,
};
match LoopBodyCarrierPromoter::try_promote(&request) {
PromotionResult::Promoted { trim_info } => {
eprintln!(
"[TrimLoopLowerer] LoopBodyLocal '{}' promoted to carrier '{}'",
trim_info.var_name, trim_info.carrier_name
);
// Step 3: Convert to CarrierInfo and merge
let promoted_carrier = trim_info.to_carrier_info();
carrier_info.merge_from(&promoted_carrier);
eprintln!(
"[TrimLoopLowerer] Merged carrier '{}' into CarrierInfo (total carriers: {})",
trim_info.carrier_name,
carrier_info.carrier_count()
);
// Step 4: Safety check via TrimLoopHelper
let trim_helper = carrier_info
.trim_helper()
.ok_or_else(|| {
format!(
"[TrimLoopLowerer] Promoted but no TrimLoopHelper attached (carrier: '{}')",
trim_info.carrier_name
)
})?;
if !trim_helper.is_safe_trim() {
return Err(format!(
"[TrimLoopLowerer] Trim pattern detected but not safe: carrier='{}', whitespace_count={}",
trim_helper.carrier_name,
trim_helper.whitespace_chars.len()
));
}
eprintln!("[TrimLoopLowerer] Safe Trim pattern detected, implementing lowering");
eprintln!(
"[TrimLoopLowerer] Carrier: '{}', original var: '{}', whitespace chars: {:?}",
trim_helper.carrier_name, trim_helper.original_var, trim_helper.whitespace_chars
);
// Step 5: Generate carrier initialization code
Self::generate_carrier_initialization(
builder,
body,
trim_helper,
)?;
eprintln!(
"[TrimLoopLowerer] Registered carrier '{}' in variable_map",
trim_helper.carrier_name
);
// Step 6: Generate Trim break condition
let trim_break_condition = Self::generate_trim_break_condition(trim_helper);
eprintln!(
"[TrimLoopLowerer] Replaced break condition with !{}",
trim_helper.carrier_name
);
// Step 7: Setup ConditionEnv bindings
let condition_bindings = Self::setup_condition_env_bindings(
builder,
trim_helper,
alloc_join_value,
)?;
eprintln!(
"[TrimLoopLowerer] Added {} condition bindings",
condition_bindings.len()
);
// Step 8: Return result with all updates
Ok(Some(TrimLoweringResult {
condition: trim_break_condition,
carrier_info: carrier_info.clone(),
condition_bindings,
}))
}
PromotionResult::CannotPromote { reason, vars } => {
// Phase 180: Fail-Fast on promotion failure
Err(format!(
"[TrimLoopLowerer] Cannot promote LoopBodyLocal variables {:?}: {}",
vars, reason
))
}
}
}
/// Generate carrier initialization code
///
/// Phase 180-3: Extracted from Pattern2 (lines 256-313)
///
/// Generates:
/// 1. ch0 = s.substring(start, start+1)
/// 2. is_ch_match0 = (ch0 == " " || ch0 == "\t" || ...)
/// 3. Registers carrier in variable_map
fn generate_carrier_initialization(
builder: &mut MirBuilder,
body: &[ASTNode],
trim_helper: &crate::mir::loop_pattern_detection::trim_loop_helper::TrimLoopHelper,
) -> Result<(), String> {
use crate::mir::builder::control_flow::joinir::patterns::trim_pattern_validator::TrimPatternValidator;
// Extract substring pattern from body
let (s_name, start_expr) = TrimPatternValidator::extract_substring_args(body, &trim_helper.original_var)
.ok_or_else(|| {
format!(
"[TrimLoopLowerer] Failed to extract substring pattern for Trim carrier '{}'",
trim_helper.carrier_name
)
})?;
eprintln!(
"[TrimLoopLowerer] Extracted substring pattern: s='{}', start={:?}",
s_name, start_expr
);
// Get ValueIds for string and start
let s_id = builder
.variable_map
.get(&s_name)
.copied()
.ok_or_else(|| format!("[TrimLoopLowerer] String variable '{}' not found", s_name))?;
// Compile start expression to get ValueId
let start_id = builder.build_expression_impl(*start_expr)?;
// Generate: start + 1
use crate::mir::builder::emission::constant::emit_integer;
use crate::mir::instruction::MirInstruction;
use crate::mir::types::BinaryOp;
let one = emit_integer(builder, 1);
let start_plus_1 = builder.value_gen.next();
builder.emit_instruction(MirInstruction::BinOp {
dst: start_plus_1,
op: BinaryOp::Add,
lhs: start_id,
rhs: one,
})?;
// Generate: ch0 = s.substring(start, start+1)
let ch0 = builder.value_gen.next();
builder.emit_method_call(
Some(ch0),
s_id,
"substring".to_string(),
vec![start_id, start_plus_1],
)?;
eprintln!("[TrimLoopLowerer] Generated initial substring call: ch0 = {:?}", ch0);
// Generate: is_ch_match0 = (ch0 == " " || ch0 == "\t" || ...)
let is_ch_match0 =
TrimPatternValidator::emit_whitespace_check(builder, ch0, &trim_helper.whitespace_chars)?;
eprintln!(
"[TrimLoopLowerer] Generated initial whitespace check: is_ch_match0 = {:?}",
is_ch_match0
);
// Register carrier in variable_map
builder
.variable_map
.insert(trim_helper.carrier_name.clone(), is_ch_match0);
Ok(())
}
/// Generate Trim break condition
///
/// Phase 180-3: Extracted from Pattern2 (lines 343-377)
///
/// Returns: !is_carrier (negated carrier check)
fn generate_trim_break_condition(
trim_helper: &crate::mir::loop_pattern_detection::trim_loop_helper::TrimLoopHelper,
) -> ASTNode {
use crate::mir::builder::control_flow::joinir::patterns::trim_pattern_lowerer::TrimPatternLowerer;
TrimPatternLowerer::generate_trim_break_condition(trim_helper)
}
/// Setup ConditionEnv bindings for Trim carrier
///
/// Phase 180-3: Extracted from Pattern2 (lines 345-377)
///
/// Creates bindings for:
/// 1. Carrier variable (e.g., "is_ch_match")
/// 2. Original variable (e.g., "ch") - mapped to same JoinIR ValueId
fn setup_condition_env_bindings(
builder: &mut MirBuilder,
trim_helper: &crate::mir::loop_pattern_detection::trim_loop_helper::TrimLoopHelper,
alloc_join_value: &mut dyn FnMut() -> ValueId,
) -> Result<Vec<ConditionBinding>, String> {
use crate::mir::builder::control_flow::joinir::patterns::trim_pattern_lowerer::TrimPatternLowerer;
let mut bindings = Vec::new();
// Add carrier to ConditionEnv
let get_value = |name: &str| builder.variable_map.get(name).copied();
let mut env_temp = std::collections::HashMap::new(); // Temporary env for closure
let binding = TrimPatternLowerer::add_to_condition_env(
trim_helper,
get_value,
|name, value| {
env_temp.insert(name, value);
},
alloc_join_value,
)?;
eprintln!(
"[TrimLoopLowerer] Added carrier '{}' to ConditionEnv: HOST {:?} → JoinIR {:?}",
trim_helper.carrier_name, binding.host_value, binding.join_value
);
bindings.push(binding.clone());
// Phase 176-6: Also map the original variable name to the same JoinIR ValueId
// This allows the loop body to reference the original variable (e.g., 'ch')
// even though it was promoted to a carrier (e.g., 'is_ch_match')
let original_binding = ConditionBinding {
name: trim_helper.original_var.clone(),
host_value: binding.host_value,
join_value: binding.join_value,
};
eprintln!(
"[TrimLoopLowerer] Phase 176-6: Also mapped original var '{}' → JoinIR {:?}",
trim_helper.original_var, binding.join_value
);
bindings.push(original_binding);
Ok(bindings)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_trim_loop_lowerer_skeleton() {
// Phase 180-2: Basic existence test
// Full tests will be added in Phase 180-3
assert!(true, "TrimLoopLowerer skeleton compiles");
}
}

1
src/mir/join_ir/lowering/mod.rs
View File

@ -60,7 +60,6 @@ pub mod skip_ws;
pub mod stage1_using_resolver;
pub mod stageb_body;
pub mod stageb_funcscanner;
pub mod trim_loop_lowering; // Phase 180: Trim/P5 dedicated lowering module
pub mod type_hint_policy; // Phase 65.5: 型ヒントポリシー箱化
pub mod type_inference; // Phase 65-2-A
pub(crate) mod value_id_ranges; // Internal ValueId range management

221
src/mir/join_ir/lowering/trim_loop_lowering.rs
View File

@ -1,221 +0,0 @@
//! Phase 180: Trim/P5 Dedicated Lowering Module
//!
//! Consolidates all Trim pattern lowering logic from Pattern2/Pattern4.
//! Pattern2/Pattern4 handle generic loop structures, while this module
//! handles Trim/CharComparison (Pattern 5) specific knowledge.
//!
//! ## Responsibilities
//!
//! - Detect Trim-like loops (whitespace skipping patterns)
//! - Promote LoopBodyLocal variables to carriers
//! - Generate carrier initialization code (substring + whitespace check)
//! - Replace break conditions with carrier checks
//! - Setup ConditionEnv bindings for JoinIR
//!
//! ## Design Philosophy
//!
//! Follows Box Theory principles:
//! - **Single Responsibility**: Only handles Trim/P5 lowering logic
//! - **Reusability**: Used by Pattern2, Pattern4, and future patterns
//! - **Testability**: Pure data transformations, easy to unit test
//! - **Fail-Fast**: Returns errors early, no silent fallbacks
//!
//! ## Example Use Case
//!
//! **Original pattern** (Pattern 2 with Trim):
//! ```nyash
//! loop(start < end) {
//! local ch = s.substring(start, start+1)
//! if ch == " " || ch == "\t" { start = start + 1 } else { break }
//! }
//! ```
//!
//! **After TrimLoopLowerer processing**:
//! - LoopBodyLocal `ch` promoted to bool carrier `is_ch_match`
//! - Carrier initialized: `is_ch_match = (s.substring(start, start+1) == " " || ...)`
//! - Break condition replaced: `break on !is_ch_match`
//! - ConditionEnv binding: `ch` → JoinIR ValueId
use crate::ast::ASTNode;
use crate::mir::builder::MirBuilder;
use crate::mir::join_ir::lowering::carrier_info::CarrierInfo;
use crate::mir::join_ir::lowering::condition_env::ConditionBinding;
use crate::mir::join_ir::lowering::loop_scope_shape::LoopScopeShape;
use crate::mir::loop_pattern_detection::loop_body_carrier_promoter::{
LoopBodyCarrierPromoter, PromotionRequest, PromotionResult,
};
use crate::mir::loop_pattern_detection::loop_condition_scope::LoopConditionScopeBox;
use crate::mir::ValueId;
/// Trim pattern lowering orchestrator
///
/// Phase 180: Single entry point for all Trim/P5 lowering operations.
pub struct TrimLoopLowerer;
/// Result of successful Trim lowering preprocessing
///
/// Contains all data needed by Pattern2/4 to complete lowering:
/// - Replaced break condition
/// - Updated carrier info with promoted carrier
/// - Condition environment bindings
/// - Trim helper for pattern-specific operations
pub struct TrimLoweringResult {
/// Replaced break condition (e.g., `!is_carrier`)
///
/// Pattern2/4 will use this instead of the original break condition
pub condition: ASTNode,
/// Updated carrier info with promoted Trim carrier
///
/// Pattern2/4 will use this for JoinIR lowering
pub carrier_info: CarrierInfo,
/// Condition environment bindings for the carrier
///
/// Pattern2/4 will extend their condition_bindings with these
pub condition_bindings: Vec<ConditionBinding>,
}
impl TrimLoopLowerer {
/// Try to lower a Trim-like loop pattern
///
/// Phase 180: Main entry point for Trim pattern detection and lowering.
///
/// # Algorithm
///
/// 1. Check if condition references LoopBodyLocal variables
/// 2. Try to promote LoopBodyLocal to carrier (via LoopBodyCarrierPromoter)
/// 3. If promoted as Trim pattern:
/// - Generate carrier initialization code
/// - Replace break condition with carrier check
/// - Setup ConditionEnv bindings
/// 4. Return TrimLoweringResult with all updates
///
/// # Arguments
///
/// * `builder` - MirBuilder for code generation
/// * `scope` - Loop structure metadata
/// * `loop_cond` - Main loop condition (e.g., `start < end`)
/// * `break_cond` - Break condition from loop body
/// * `body` - Loop body AST nodes
/// * `loop_var_name` - Loop variable name (e.g., "start")
/// * `carrier_info` - Current carrier info (will be updated if Trim pattern)
/// * `alloc_join_value` - JoinIR ValueId allocator closure
///
/// # Returns
///
/// - `Ok(Some(TrimLoweringResult))` - Trim pattern detected and lowered
/// - `Ok(None)` - Not a Trim pattern (normal loop, no action taken)
/// - `Err(String)` - Trim pattern detected but lowering failed
///
/// # Example
///
/// ```ignore
/// if let Some(trim_result) = TrimLoopLowerer::try_lower_trim_like_loop(
/// self,
/// &scope,
/// condition,
/// &break_condition_node,
/// _body,
/// &loop_var_name,
/// &mut carrier_info,
/// &mut alloc_join_value,
/// )? {
/// // Use trim_result.condition, carrier_info, condition_bindings
/// }
/// ```
pub fn try_lower_trim_like_loop(
builder: &mut MirBuilder,
scope: &LoopScopeShape,
loop_cond: &ASTNode,
break_cond: &ASTNode,
body: &[ASTNode],
loop_var_name: &str,
carrier_info: &mut CarrierInfo,
alloc_join_value: &mut dyn FnMut() -> ValueId,
) -> Result<Option<TrimLoweringResult>, String> {
// Phase 180-2: Skeleton implementation
// TODO: Phase 180-3 will implement full logic from Pattern2
// Step 1: Check if condition references LoopBodyLocal variables
let cond_scope = LoopConditionScopeBox::analyze(
loop_var_name,
&[loop_cond, break_cond],
Some(scope),
);
eprintln!(
"[TrimLoopLowerer] Analyzing condition scope: {} variables",
cond_scope.vars.len()
);
if !cond_scope.has_loop_body_local() {
// Not a Trim pattern - normal loop
eprintln!("[TrimLoopLowerer] No LoopBodyLocal detected, skipping Trim lowering");
return Ok(None);
}
eprintln!("[TrimLoopLowerer] LoopBodyLocal detected in condition scope");
// Step 2: Try promotion via LoopBodyCarrierPromoter
let request = PromotionRequest {
scope,
cond_scope: &cond_scope,
break_cond: Some(break_cond),
loop_body: body,
};
match LoopBodyCarrierPromoter::try_promote(&request) {
PromotionResult::Promoted { trim_info } => {
eprintln!(
"[TrimLoopLowerer] LoopBodyLocal '{}' promoted to carrier '{}'",
trim_info.var_name, trim_info.carrier_name
);
// Step 3: Convert to CarrierInfo and merge
let promoted_carrier = trim_info.to_carrier_info();
carrier_info.merge_from(&promoted_carrier);
eprintln!(
"[TrimLoopLowerer] Merged carrier '{}' into CarrierInfo (total carriers: {})",
trim_info.carrier_name,
carrier_info.carrier_count()
);
// Step 4: Generate carrier initialization code
// TODO: Phase 180-3 will implement full logic
// For now, return minimal result to pass compilation
// Placeholder: Return error to indicate incomplete implementation
return Err(format!(
"[TrimLoopLowerer] Phase 180-2 skeleton: Trim lowering not yet implemented (carrier: '{}')",
trim_info.carrier_name
));
}
PromotionResult::CannotPromote { reason, vars } => {
// Phase 180: Fail-Fast on promotion failure
return Err(format!(
"[TrimLoopLowerer] Cannot promote LoopBodyLocal variables {:?}: {}",
vars, reason
));
}
}
}
// TODO: Phase 180-3 will add helper methods:
// - generate_carrier_initialization()
// - generate_trim_break_condition()
// - setup_condition_env_bindings()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_trim_loop_lowerer_skeleton() {
// Phase 180-2: Basic existence test
// Full tests will be added in Phase 180-3
assert!(true, "TrimLoopLowerer skeleton compiles");
}
}