Stage-A selfhost emitter fixes and LLVM opt toggle

src/llvm_py/llvm_builder.py

@@ -41,6 +41,42 @@ from build_ctx import BuildCtx
 from resolver import Resolver
 from mir_reader import MIRReader
 
+_OPT_ENV_KEYS = ("HAKO_LLVM_OPT_LEVEL", "NYASH_LLVM_OPT_LEVEL")
+
+def _parse_opt_level_env() -> int:
+    """Return desired optimization level (0-3). Defaults to 2."""
+    for key in _OPT_ENV_KEYS:
+        raw = os.environ.get(key)
+        if not raw:
+            continue
+        value = raw.strip()
+        if not value:
+            continue
+        upper = value.upper()
+        if upper.startswith("O"):
+            value = upper[1:]
+        try:
+            lvl = int(value)
+        except ValueError:
+            continue
+        if lvl < 0:
+            lvl = 0
+        if lvl > 3:
+            lvl = 3
+        return lvl
+    return 2
+
+def _resolve_codegen_opt_level():
+    """Map env level to llvmlite CodeGenOptLevel enum (fallback to int)."""
+    level = _parse_opt_level_env()
+    try:
+        names = {0: "None", 1: "Less", 2: "Default", 3: "Aggressive"}
+        enum = getattr(llvm, "CodeGenOptLevel")
+        attr = names.get(level, "Default")
+        return getattr(enum, attr)
+    except Exception:
+        return level
+
 class NyashLLVMBuilder:
     """Main LLVM IR builder for Nyash MIR"""
     
@@ -627,7 +663,11 @@ class NyashLLVMBuilder:
         """Compile module to object file"""
         # Create target machine
         target = llvm.Target.from_default_triple()
-        target_machine = target.create_target_machine()
+        target_machine = target.create_target_machine(opt=_resolve_codegen_opt_level())
+        try:
+            trace_debug(f"[Python LLVM] opt-level={_parse_opt_level_env()}")
+        except Exception:
+            pass
         
         # Compile
         ir_text = str(self.module)