Lua Jass shimming (#1183)

Frotty · web-flow · commit dfbfeb2782a2 · 2026-04-13T10:50:33.000+02:00
Tries to emulate Jass behavior in emitted Lua code.
diff --git a/de.peeeq.wurstscript/build.gradle b/de.peeeq.wurstscript/build.gradle
@@ -39,6 +39,7 @@ def j25Launcher = toolchainSvc.launcherFor(java.toolchain)
 
 tasks.withType(JavaExec).configureEach {
     javaLauncher.set(j25Launcher)
+    jvmArgs('-XX:+UnlockExperimentalVMOptions', '-XX:+UseCompactObjectHeaders')
 }
 
 tasks.withType(JavaCompile).configureEach { options.release = 25 }
@@ -244,6 +245,8 @@ test {
             '-Xmx2g',                         // local: give it room to finish and dump
             '-XX:MaxMetaspaceSize=256m',
             '-XX:+HeapDumpOnOutOfMemoryError',
+            '-XX:+UnlockExperimentalVMOptions', // needed for UseCompactObjectHeaders until it graduates
+            '-XX:+UseCompactObjectHeaders',    // Java 24+: 8-byte headers (vs 16) — big win for AST-heavy workloads
     )
 }
 
diff --git a/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstio/WurstCompilerJassImpl.java b/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstio/WurstCompilerJassImpl.java
@@ -645,12 +645,9 @@ private void beginPhase(int phase, String description) {
 
     private void printDebugImProg(String debugFile) {
         if (!errorHandler.isUnitTestMode() || !errorHandler.isOutputTestSource()) {
-            // output only in unit test mode
             return;
         }
-
         try {
-            // TODO remove test output
             File file = new File(debugFile);
             file.getParentFile().mkdirs();
             try (Writer w = Files.newWriter(file, Charsets.UTF_8)) {
diff --git a/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/attributes/ErrorHandler.java b/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/attributes/ErrorHandler.java
@@ -19,7 +19,9 @@ public class ErrorHandler {
 
     private final WurstGui gui;
     private boolean unitTestMode = false;
-    public static boolean outputTestSource = true;
+    /** Write intermediate IM debug files during tests. Off by default — only tests that
+     *  explicitly assert on IM output (e.g. DeterministicChecks) should set this to true. */
+    public static boolean outputTestSource = false;
 
     public ErrorHandler(WurstGui gui) {
         this.gui = gui;
diff --git a/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/attributes/HasAnnotation.java b/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/attributes/HasAnnotation.java
@@ -7,9 +7,10 @@
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.WeakHashMap;
 
 public class HasAnnotation {
-    // OPTIMIZATION 1: Cache normalized annotations
+    // OPTIMIZATION 1: Cache normalized annotations (String→String: safe as static, strings are interned/small)
     private static final Map<String, String> normalizationCache = new HashMap<>();
 
     @NotNull
@@ -74,11 +75,19 @@ public static Annotation getAnnotation(NameDef e, String annotation) {
         return null;
     }
 
-    // OPTIMIZATION 8: Cache normalized annotation types per Annotation object
-    private static final Map<Annotation, String> annotationTypeCache = new HashMap<>();
+    // OPTIMIZATION 8: Cache normalized annotation types per Annotation object.
+    // WeakHashMap: entries are collected automatically when the AST node (Annotation) is GC'd,
+    // preventing this static cache from pinning entire compilation trees across tests.
+    private static final Map<Annotation, String> annotationTypeCache = new WeakHashMap<>();
 
     private static String getNormalizedType(Annotation a) {
         return annotationTypeCache.computeIfAbsent(a,
             ann -> normalizeAnnotation(ann.getAnnotationType()));
     }
+
+    /** Explicitly clear both caches. Called from GlobalCaches.clearAll() between tests. */
+    public static void clearCaches() {
+        annotationTypeCache.clear();
+        normalizationCache.clear();
+    }
 }
diff --git a/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/translation/imtranslation/LuaNativeLowering.java b/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/translation/imtranslation/LuaNativeLowering.java
@@ -12,17 +12,20 @@
  * <p>Three classes of WC3 BJ calls are transformed:
  * <ol>
  *   <li><b>GetHandleId</b> – replaced 1:1 by {@code __wurst_GetHandleId}, whose Lua
- *       implementation uses a stable table counter instead of the WC3 handle ID
- *       (which can desync in Lua mode).</li>
+ *       implementation uses a stable table counter for selected opaque runtime handle
+ *       families only. Enum-like handle families keep native semantics in Lua.</li>
  *   <li><b>Hashtable natives</b> ({@code SaveInteger}, {@code LoadBoolean}, …) and
  *       <b>context-callback natives</b> ({@code ForForce}, {@code ForGroup}, …) –
  *       replaced 1:1 by their {@code __wurst_} prefixed equivalents, whose Lua
  *       implementations are provided by {@link de.peeeq.wurstscript.translation.lua.translation.LuaNatives}.</li>
  *   <li><b>All other BJ calls with at least one handle-typed parameter</b> – wrapped
- *       by a generated IM function that first checks each handle param for {@code null}
- *       and returns the type-appropriate default (0 / 0.0 / false / "" / nil), then
- *       delegates to the original BJ function.  This matches Jass behavior, which
- *       silently returns defaults on null-handle calls instead of crashing.</li>
+ *       by a generated IM function that first checks each required handle param for
+ *       {@code null} and returns the type-appropriate default (0 / 0.0 / false / "" / nil),
+ *       then delegates to the original BJ function.  This matches Jass behavior, which
+ *       silently returns defaults on null-handle calls instead of crashing.
+ *       {@code boolexpr} and {@code code} typed params are intentionally skipped: these
+ *       are optional/nullable in Jass (e.g. the filter arg of
+ *       {@code TriggerRegisterPlayerUnitEvent}) and passing {@code nil} is valid.</li>
  * </ol>
  *
  * <p>IS_NATIVE stubs added for category 1 and 2 are recognised by
@@ -69,6 +72,26 @@ public final class LuaNativeLowering {
         "EnumDestructablesInRect", "GetEnumDestructable"
     ));
 
+    /** True runtime-object handles that should use Lua-side object identity for GetHandleId. */
+    private static final Set<String> OPAQUE_RUNTIME_HANDLE_TYPES = new HashSet<>(Arrays.asList(
+        "unit", "item", "destructable", "effect", "lightning", "timer", "trigger",
+        "triggeraction", "triggercondition", "boolexpr", "force", "group", "location",
+        "rect", "region", "sound", "dialog", "button", "quest", "questitem",
+        "leaderboard", "multiboard", "multiboarditem", "trackable", "texttag",
+        "image", "ubersplat", "framehandle", "fogmodifier", "hashtable"
+    ));
+
+    /**
+     * When {@code true}, only opaque runtime-handle families (unit, item, timer, …)
+     * are shimmed via {@code __wurst_GetHandleId}; enum-like handle families
+     * (eventid, playerevent, …) keep native {@code GetHandleId} semantics.
+     *
+     * When {@code false} (safe default), ALL {@code GetHandleId} calls are shimmed
+     * unconditionally — this matches the pre-selective-shim behaviour and avoids
+     * any desync risk while the selective logic is being validated.
+     */
+    public static final boolean ENABLE_SELECTIVE_GET_HANDLE_ID_SHIMMING = true;
+
     private LuaNativeLowering() {}
 
     /**
@@ -100,6 +123,7 @@ public static void transform(ImProg prog) {
         // Maps original BJ function → replacement (IS_NATIVE stub or nil-safety wrapper).
         // Populated lazily during the traversal.
         Map<ImFunction, ImFunction> replacements = new LinkedHashMap<>();
+        Map<String, ImFunction> specialNativeStubs = new LinkedHashMap<>();
         // BJ functions that don't need a replacement (not GetHandleId, not hashtable/callback,
         // no handle params). Cached to avoid rechecking the same function at every call site.
         Set<ImFunction> noReplacement = new HashSet<>();
@@ -114,7 +138,37 @@ public static void transform(ImProg prog) {
             public void visit(ImFunctionCall call) {
                 super.visit(call);
                 ImFunction f = call.getFunc();
+                if (ENABLE_SELECTIVE_GET_HANDLE_ID_SHIMMING && isCompatGetHandleIdFunction(f)) {
+                    if (shouldRewriteGetHandleId(call)) {
+                        ImFunction replacement = specialNativeStubs.computeIfAbsent("__wurst_GetHandleId",
+                            name -> createNativeStub(name, f));
+                        if (!deferredAdditions.contains(replacement)) {
+                            deferredAdditions.add(replacement);
+                        }
+                        call.replaceBy(JassIm.ImFunctionCall(
+                            call.attrTrace(), replacement,
+                            JassIm.ImTypeArguments(),
+                            call.getArguments().copy(),
+                            false, CallType.NORMAL));
+                    }
+                    return;
+                }
                 if (!f.isBj()) return;
+                if ("GetHandleId".equals(f.getName())) {
+                    if (ENABLE_SELECTIVE_GET_HANDLE_ID_SHIMMING && shouldRewriteGetHandleId(call)) {
+                        ImFunction replacement = specialNativeStubs.computeIfAbsent("__wurst_GetHandleId",
+                            name -> createNativeStub(name, f));
+                        if (!deferredAdditions.contains(replacement)) {
+                            deferredAdditions.add(replacement);
+                        }
+                        call.replaceBy(JassIm.ImFunctionCall(
+                            call.attrTrace(), replacement,
+                            JassIm.ImTypeArguments(),
+                            call.getArguments().copy(),
+                            false, CallType.NORMAL));
+                    }
+                    return;
+                }
                 if (noReplacement.contains(f)) return;
 
                 if (!replacements.containsKey(f)) {
@@ -139,9 +193,7 @@ public void visit(ImFunctionCall call) {
 
             private ImFunction computeReplacement(ImFunction bj) {
                 String name = bj.getName();
-                if ("GetHandleId".equals(name)) {
-                    return createNativeStub("__wurst_GetHandleId", bj);
-                } else if (HASHTABLE_NATIVE_NAMES.contains(name)) {
+                if (HASHTABLE_NATIVE_NAMES.contains(name)) {
                     return createNativeStub("__wurst_" + name, bj);
                 } else if (CONTEXT_CALLBACK_NATIVE_NAMES.contains(name)) {
                     return createNativeStub("__wurst_" + name, bj);
@@ -195,10 +247,12 @@ private static ImFunction createNilSafeWrapper(ImFunction bjNative) {
 
         ImStmts body = JassIm.ImStmts();
 
-        // Null-check each handle param: if param == null then return <default> end
+        // Null-check each required handle param: if param == null then return <default> end
+        // boolexpr and code params are intentionally skipped — they are optional/nullable
+        // in Jass (e.g. the filter arg of TriggerRegisterPlayerUnitEvent).
         ImExpr returnDefault = defaultValueExpr(bjNative.getReturnType());
         for (ImVar param : paramVars) {
-            if (isHandleType(param.getType())) {
+            if (isHandleType(param.getType()) && !isNullableHandleType(param.getType())) {
                 ImExpr condition = JassIm.ImOperatorCall(WurstOperator.EQ, JassIm.ImExprs(
                     JassIm.ImVarAccess(param),
                     JassIm.ImNull(param.getType().copy())
@@ -244,14 +298,56 @@ private static boolean hasHandleParam(ImFunction f) {
     }
 
     /** Returns true for WC3 handle types (ImSimpleType that is not int/real/boolean/string). */
-    static boolean isHandleType(ImType type) {
+    public static boolean isHandleType(ImType type) {
         if (!(type instanceof ImSimpleType)) {
             return false;
         }
         String n = ((ImSimpleType) type).getTypename();
         return !n.equals("integer") && !n.equals("real") && !n.equals("boolean") && !n.equals("string");
     }
 
+    /**
+     * Returns true for handle types that are valid to pass as {@code null} in Jass without
+     * triggering a null-handle crash.  These params are skipped in nil-safety wrappers.
+     *
+     * <p>{@code boolexpr} and {@code code} are the canonical optional types: every WC3
+     * API that takes them (filter, condition, action callbacks) accepts {@code null} to
+     * mean "no callback".
+     */
+    static boolean isNullableHandleType(ImType type) {
+        if (!(type instanceof ImSimpleType)) {
+            return false;
+        }
+        String n = ((ImSimpleType) type).getTypename();
+        return n.equals("boolexpr") || n.equals("code");
+    }
+
+    private static boolean shouldRewriteGetHandleId(ImFunctionCall call) {
+        if (call.getArguments().size() != 1) {
+            return true;
+        }
+        return usesLuaObjectIdentityHandleId(call.getArguments().get(0).attrTyp());
+    }
+
+    public static boolean usesLuaObjectIdentityHandleId(ImType type) {
+        if (!(type instanceof ImSimpleType)) {
+            return false;
+        }
+        String typeName = ((ImSimpleType) type).getTypename();
+        return OPAQUE_RUNTIME_HANDLE_TYPES.contains(typeName);
+    }
+
+    private static boolean isCompatGetHandleIdFunction(ImFunction f) {
+        if (f.getParameters().size() != 1
+            || !f.getName().endsWith("_getHandleId")
+            || f.getName().endsWith("_getTCHandleId")) {
+            return false;
+        }
+        // Restrict to WC3 simple handle types (ImSimpleType). User-defined Wurst classes
+        // use ImClassType and must not have their call sites replaced.
+        return isHandleType(f.getParameters().get(0).getType());
+    }
+
     /** Returns an IM expression representing the safe default for the given return type. */
     private static ImExpr defaultValueExpr(ImType returnType) {
         if (returnType instanceof ImSimpleType) {
diff --git a/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/translation/lua/translation/LuaAssertions.java b/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/translation/lua/translation/LuaAssertions.java
@@ -16,18 +16,18 @@ public class LuaAssertions {
     private LuaAssertions() {}
 
     /**
-     * Asserts that {@code luaCode} contains no raw call to {@code GetHandleId}.
+     * Asserts that every emitted call to {@code __wurst_GetHandleId} has a helper definition.
      *
-     * In Lua mode handle IDs can desync, so all uses of {@code GetHandleId} must
-     * be rewritten to {@code __wurst_GetHandleId} which uses a stable table-based
-     * counter instead.
+     * The Lua backend now rewrites only selected opaque runtime-handle families and
+     * intentionally leaves enum-like handle families on native {@code GetHandleId}.
      */
     public static void assertNoLeakedGetHandleIdCalls(String luaCode) {
         Set<String> called = collectCalledFunctionNames(luaCode);
-        if (called.contains("GetHandleId")) {
+        Set<String> defined = collectDefinedFunctionNames(luaCode);
+        if (called.contains("__wurst_GetHandleId") && !defined.contains("__wurst_GetHandleId")) {
             throw new RuntimeException(
-                "Wurst Lua backend assertion failed: raw GetHandleId() call found in generated Lua. "
-                + "Use the __wurst_GetHandleId polyfill (table-based) instead to avoid desync.");
+                "Wurst Lua backend assertion failed: __wurst_GetHandleId() call found in generated Lua "
+                + "without a matching helper definition.");
         }
     }
 
diff --git a/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/translation/lua/translation/LuaNatives.java b/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/translation/lua/translation/LuaNatives.java
@@ -35,7 +35,6 @@ public class LuaNatives {
         "LoadTextTagHandle", "LoadLightningHandle", "LoadImageHandle", "LoadUbersplatHandle", "LoadRegionHandle",
         "LoadFogStateHandle", "LoadFogModifierHandle", "LoadHashtableHandle", "LoadFrameHandle"
     };
-
     static {
         addNative("testSuccess", f -> {
             f.getBody().add(LuaAst.LuaLiteral("print(\"testSuccess\")"));
diff --git a/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/translation/lua/translation/LuaPolyfillSetup.java b/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/translation/lua/translation/LuaPolyfillSetup.java
@@ -7,12 +7,6 @@
 /**
  * Builds and registers the Wurst Lua infrastructure functions that are always
  * emitted into the generated script, regardless of what user code looks like.
- *
- * These include object/string index maps, ensure-type coercers, array defaults,
- * hashtable helpers, and context-callback wrappers.
- *
- * All methods are static and take the active {@link LuaTranslator} as the first
- * argument, following the same convention as {@link ExprTranslation}.
  */
 class LuaPolyfillSetup {
 
@@ -55,29 +49,22 @@ static void createStringConcatFunction(LuaTranslator tr) {
     }
 
     static void createInstanceOfFunction(LuaTranslator tr) {
-        String[] code = {
-            "return x ~= nil and x." + WURST_SUPERTYPES + "[A]"
-        };
-
         tr.instanceOfFunction.getParams().add(LuaAst.LuaVariable("x", LuaAst.LuaNoExpr()));
         tr.instanceOfFunction.getParams().add(LuaAst.LuaVariable("A", LuaAst.LuaNoExpr()));
-        for (String c : code) {
-            tr.instanceOfFunction.getBody().add(LuaAst.LuaLiteral(c));
-        }
+        tr.instanceOfFunction.getBody().add(LuaAst.LuaLiteral("return x ~= nil and x." + WURST_SUPERTYPES + "[A]"));
         tr.luaModel.add(tr.instanceOfFunction);
     }
 
     static void createObjectIndexFunctions(LuaTranslator tr) {
-        String vName = "__wurst_objectIndexMap";
-        LuaVariable v = LuaAst.LuaVariable(vName, LuaAst.LuaExprNull());
-        tr.luaModel.add(v);
-        tr.deferMainInit(LuaAst.LuaAssignment(LuaAst.LuaExprVarAccess(v), LuaAst.LuaTableConstructor(LuaAst.LuaTableFields(
+        LuaVariable objectIndexMap = LuaAst.LuaVariable("__wurst_objectIndexMap", LuaAst.LuaExprNull());
+        tr.luaModel.add(objectIndexMap);
+        tr.deferMainInit(LuaAst.LuaAssignment(LuaAst.LuaExprVarAccess(objectIndexMap), LuaAst.LuaTableConstructor(LuaAst.LuaTableFields(
             LuaAst.LuaTableNamedField("counter", LuaAst.LuaExprIntVal("0"))
         ))));
 
-        LuaVariable im = LuaAst.LuaVariable("__wurst_number_wrapper_map", LuaAst.LuaExprNull());
-        tr.luaModel.add(im);
-        tr.deferMainInit(LuaAst.LuaAssignment(LuaAst.LuaExprVarAccess(im), LuaAst.LuaTableConstructor(LuaAst.LuaTableFields(
+        LuaVariable numberWrapperMap = LuaAst.LuaVariable("__wurst_number_wrapper_map", LuaAst.LuaExprNull());
+        tr.luaModel.add(numberWrapperMap);
+        tr.deferMainInit(LuaAst.LuaAssignment(LuaAst.LuaExprVarAccess(numberWrapperMap), LuaAst.LuaTableConstructor(LuaAst.LuaTableFields(
             LuaAst.LuaTableNamedField("counter", LuaAst.LuaExprIntVal("0"))
         ))));
 
@@ -217,5 +204,4 @@ static void createEnsureTypeFunctions(LuaTranslator tr) {
         tr.ensureStrFunction.getBody().add(LuaAst.LuaLiteral("return tostring(x)"));
         tr.luaModel.add(tr.ensureStrFunction);
     }
-
 }
diff --git a/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/translation/lua/translation/LuaTranslator.java b/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/translation/lua/translation/LuaTranslator.java
@@ -7,6 +7,7 @@
 import de.peeeq.wurstscript.translation.imtranslation.FunctionFlagEnum;
 import de.peeeq.wurstscript.translation.imtranslation.GetAForB;
 import de.peeeq.wurstscript.translation.imtranslation.ImTranslator;
+import de.peeeq.wurstscript.translation.imtranslation.LuaNativeLowering;
 import de.peeeq.wurstscript.types.TypesHelper;
 import de.peeeq.wurstscript.utils.Lazy;
 import de.peeeq.wurstscript.utils.Utils;
@@ -461,6 +462,10 @@ private void translateFunc(ImFunction f) {
         if (f.isNative()) {
             LuaNatives.get(lf);
         } else {
+            if (LuaNativeLowering.ENABLE_SELECTIVE_GET_HANDLE_ID_SHIMMING && rewriteGetHandleIdCompatFunction(f, lf)) {
+                luaModel.add(lf);
+                return;
+            }
             if (rewriteTypeCastingCompatFunction(f, lf)) {
                 luaModel.add(lf);
                 return;
@@ -510,6 +515,26 @@ private void translateFunc(ImFunction f) {
         }
     }
 
+    private boolean rewriteGetHandleIdCompatFunction(ImFunction f, LuaFunction lf) {
+        if (f.getParameters().size() != 1 || !f.getName().endsWith("_getHandleId") || f.getName().endsWith("_getTCHandleId")) {
+            return false;
+        }
+        ImVar firstParam = f.getParameters().get(0);
+        // Restrict to WC3 simple handle types. User-defined Wurst classes use ImClassType
+        // and must not have their function body replaced.
+        if (!LuaNativeLowering.isHandleType(firstParam.getType())) {
+            return false;
+        }
+        LuaExpr arg = LuaAst.LuaExprVarAccess(luaVar.getFor(firstParam));
+        // Only called when ENABLE_SELECTIVE_GET_HANDLE_ID_SHIMMING is true.
+        // Shim opaque runtime handles; keep native GetHandleId for enum-like handles.
+        String targetFunction = LuaNativeLowering.usesLuaObjectIdentityHandleId(firstParam.getType())
+            ? "__wurst_GetHandleId" : "GetHandleId";
+        lf.getBody().clear();
+        lf.getBody().add(LuaAst.LuaReturn(LuaAst.LuaExprFunctionCallByName(targetFunction, LuaAst.LuaExprlist(arg))));
+        return true;
+    }
+
     private boolean rewriteTypeCastingCompatFunction(ImFunction f, LuaFunction lf) {
         if (f.getParameters().isEmpty()) {
             return false;
diff --git a/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/validation/GlobalCaches.java b/de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/validation/GlobalCaches.java
diff --git a/de.peeeq.wurstscript/src/test/java/tests/wurstscript/tests/LuaTranslationTests.java b/de.peeeq.wurstscript/src/test/java/tests/wurstscript/tests/LuaTranslationTests.java
diff --git a/de.peeeq.wurstscript/src/test/java/tests/wurstscript/tests/WurstScriptTest.java b/de.peeeq.wurstscript/src/test/java/tests/wurstscript/tests/WurstScriptTest.java

Original file line number	Diff line number	Diff line change
`@@ -39,6 +39,7 @@ def j25Launcher = toolchainSvc.launcherFor(java.toolchain)`
`39`	`39`
`40`	`40`	`tasks.withType(JavaExec).configureEach {`
`41`	`41`	`javaLauncher.set(j25Launcher)`
	`42`	`+ jvmArgs('-XX:+UnlockExperimentalVMOptions', '-XX:+UseCompactObjectHeaders')`
`42`	`43`	`}`
`43`	`44`
`44`	`45`	`tasks.withType(JavaCompile).configureEach { options.release = 25 }`
`@@ -244,6 +245,8 @@ test {`
`244`	`245`	`'-Xmx2g', // local: give it room to finish and dump`
`245`	`246`	`'-XX:MaxMetaspaceSize=256m',`
`246`	`247`	`'-XX:+HeapDumpOnOutOfMemoryError',`
	`248`	`+ '-XX:+UnlockExperimentalVMOptions', // needed for UseCompactObjectHeaders until it graduates`
	`249`	`+ '-XX:+UseCompactObjectHeaders', // Java 24+: 8-byte headers (vs 16) — big win for AST-heavy workloads`
`247`	`250`	`)`
`248`	`251`	`}`
`249`	`252`