From 804ccff23f89a684ed021131040b652a68ab33d1 Mon Sep 17 00:00:00 2001
From: nyash-codex <codex@nyash.local>
Date: Tue, 2 Dec 2025 13:09:10 +0900
Subject: [PATCH] =?UTF-8?q?feat(phase73):=20Selfhost=20Stage-B=20I/O=20?=
 =?UTF-8?q?=E7=B0=A1=E7=B4=A0=E5=8C=96=20-=20HAKO=5FSRC=20=E7=92=B0?=
 =?UTF-8?q?=E5=A2=83=E5=A4=89=E6=95=B0=E7=B5=B1=E4=B8=80=E5=8C=96?=
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Unified selfhost Stage-B I/O path from argv to environment variables:
- Remove --source "$SRC_CONTENT" from compiler.hako invocation (argv limit)
- Export HAKO_SRC="$SRC_CONTENT" instead (env-based I/O)
- Update compiler_stageb.hako to check HAKO_SRC fallback

Changes:
1. lang/src/compiler/entry/compiler_stageb.hako:
   - Added HAKO_SRC env check in StageBArgsBox.resolve_src()
   - Fallback order: --source arg → HAKO_SOURCE_FILE_CONTENT → HAKO_SRC → default

2. tools/selfhost/selfhost_build.sh:
   - Removed --source "$SRC_CONTENT" from compiler.hako invocation
   - Export HAKO_SRC="$SRC_CONTENT" before Stage-B execution
   - Unified with wrapper pathway (HAKO_USE_BUILDBOX=1)

Benefits:
- Eliminates "Argument list too long" (os error 7) for large .hako files
- Single unified I/O pattern (env variables) for all Stage-B paths
- Consistent with hako_check.sh and wrapper pattern
- Ready for future HAKO_SRC_FILE optimization

Verification:
✅ NYASH_FEATURES=stage3 NYASH_USE_NY_COMPILER=1 \
  ./tools/selfhost/selfhost_build.sh --in apps/tests/stage1_run_min.hako --run
  Output: abc (correct)

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>
---
 lang/src/compiler/entry/compiler_stageb.hako | 7 +++++--
 tools/selfhost/selfhost_build.sh             | 3 ++-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/lang/src/compiler/entry/compiler_stageb.hako b/lang/src/compiler/entry/compiler_stageb.hako
index f54796dd..5106018b 100644
--- a/lang/src/compiler/entry/compiler_stageb.hako
+++ b/lang/src/compiler/entry/compiler_stageb.hako
@@ -65,8 +65,11 @@ static box StageBArgsBox {
       local inline = env.get("HAKO_SOURCE_FILE_CONTENT")
       if inline != null { src = "" + inline }
     }
-    // Skip env.local.get check - Stage-3 keyword conflict
-    // Original: if src == null { src = env.local.get("HAKO_SOURCE") }
+    // Phase 73: Fallback to HAKO_SRC env variable (unified I/O path)
+    // This eliminates the need for large argv strings (solves "Argument list too long")
+    if src == null {
+      src = env.get("HAKO_SRC")
+    }
     if src == null { src = "return 0" }
 
     {
diff --git a/tools/selfhost/selfhost_build.sh b/tools/selfhost/selfhost_build.sh
index a4782b7a..0ab3e359 100644
--- a/tools/selfhost/selfhost_build.sh
+++ b/tools/selfhost/selfhost_build.sh
@@ -93,10 +93,11 @@ else
   apply_selfhost_env
   stageb_cmd_desc="compiler.hako --stage-b --stage3"
   (
+    export HAKO_SRC="$SRC_CONTENT"
     cd "$ROOT" && \
       "$BIN" --backend vm \
         "$ROOT/lang/src/compiler/entry/compiler.hako" -- \
-        --stage-b --stage3 --source "$SRC_CONTENT"
+        --stage-b --stage3
   ) > "$RAW" 2>&1 || stageb_rc=$?
 fi