java.lang.AssertionError पैरामीटर

Question

के साथ जेनरेट विधि जोड़ते समय संकलक द्वारा फेंक दिया गया है मैं एक एनोटेशन प्रोसेसर के साथ आंतरिक सूर्य एपीआई (com.sun.tools.javac) का उपयोग कर मौजूदा कक्षा को संशोधित कर रहा हूं। मैं पैदा करते हैं और निम्नलिखित कोड का उपयोग कर एक एक ClassDecl को MethodDecl जोड़ने में सक्षम हूँ:

JCTree.JCClassDecl classDecl = ... 
JCTree.JCMethodDecl methodDecl = ... 
JCTree[] trees = new JCTree[classDecl.defs.length() + 1]; 
trees[classDecl.defs.length()] = methodDecl; 
classDecl.defs = List.from(trees); 

यह ठीक काम करता है जब तक मैं विधि घोषणा में पैरामीटर जोड़ने का प्रयास करें। मैं निम्नलिखित कोड का उपयोग उत्पन्न करने के लिए एक नया MethodDecl:

Map<String, Class<?>> paramMap = ... 
List<JCVariableDecl> parameters = List.from(paramMap.entrySet().stream() 
     .map(e -> treeMaker.VarDef(treeMaker.Modifiers(Flags.PARAMETER), elements.getName(e.getKey()), getType(e.getValue()), null)) 
     .toArray(JCVariableDecl[]::new)); 
... 
JCMethodDecl methodDecl = treeMaker.MethodDef(modifiers, methodName, returnType, genericParameters, parameters, throwables, methodBody, null); 

जब संकलन मैं निम्नलिखित स्टैकट्रेस मिलती है:

An exception has occurred in the compiler (9). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program and the following diagnostic in your report. Thank you. 
java.lang.AssertionError 
    at jdk.compiler/com.sun.tools.javac.util.Assert.error(Assert.java:155) 
    at jdk.compiler/com.sun.tools.javac.util.Assert.check(Assert.java:46) 
    at jdk.compiler/com.sun.tools.javac.util.Bits.incl(Bits.java:186) 
    at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.initParam(Flow.java:1931) 
    at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitMethodDef(Flow.java:1880) 
    at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:866) 
    at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49) 
    at jdk.compiler/com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:393) 
    at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.scan(Flow.java:1451) 
    at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitClassDef(Flow.java:1822) 
    at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:774) 
    at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49) 
    at jdk.compiler/com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:393) 
    at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.scan(Flow.java:1451) 
    at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.analyzeTree(Flow.java:2521) 
    at jdk.compiler/com.sun.tools.javac.comp.Flow$AssignAnalyzer.analyzeTree(Flow.java:2504) 
    at jdk.compiler/com.sun.tools.javac.comp.Flow.analyzeTree(Flow.java:212) 
    at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1389) 
    at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1363) 
    at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:959) 
    at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:100) 
    at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.handleExceptions(JavacTaskImpl.java:142) 
    at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:96) 
    at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:90) 
    at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:49) 
    at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:36) 
    at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.delegateAndHandleErrors(NormalizingJavaCompiler.java:99) 
    at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute(NormalizingJavaCompiler.java:52) 
    at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute(NormalizingJavaCompiler.java:37) 
    at org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute(CleaningJavaCompilerSupport.java:35) 
    at org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute(CleaningJavaCompilerSupport.java:25) 
    at org.gradle.api.tasks.compile.JavaCompile.performCompilation(JavaCompile.java:204) 
    at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:189) 
    at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:121) 
    at jdk.internal.reflect.GeneratedMethodAccessor170.invoke(Unknown Source) 
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.base/java.lang.reflect.Method.invoke(Method.java:564) 
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73) 
    at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$IncrementalTaskAction.doExecute(DefaultTaskClassInfoStore.java:179) 
    at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$StandardTaskAction.execute(DefaultTaskClassInfoStore.java:135) 
    at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$StandardTaskAction.execute(DefaultTaskClassInfoStore.java:122) 
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.run(ExecuteActionsTaskExecuter.java:121) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) 
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:110) 
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:92) 
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70) 
    at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:62) 
    at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54) 
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58) 
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:97) 
    at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:87) 
    at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:52) 
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52) 
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54) 
    at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43) 
    at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34) 
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.run(DefaultTaskGraphExecuter.java:248) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) 
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:241) 
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:230) 
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:123) 
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:79) 
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:104) 
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:98) 
    at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:625) 
    at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:580) 
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98) 
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:59) 
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:128) 
    at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37) 
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37) 
    at org.gradle.execution.DefaultBuildExecuter.access$000(DefaultBuildExecuter.java:23) 
    at org.gradle.execution.DefaultBuildExecuter$1.proceed(DefaultBuildExecuter.java:43) 
    at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:46) 
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37) 
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30) 
    at org.gradle.initialization.DefaultGradleLauncher$ExecuteTasks.run(DefaultGradleLauncher.java:314) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) 
    at org.gradle.initialization.DefaultGradleLauncher.runTasks(DefaultGradleLauncher.java:204) 
    at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:134) 
    at org.gradle.initialization.DefaultGradleLauncher.executeTasks(DefaultGradleLauncher.java:109) 
    at org.gradle.internal.invocation.GradleBuildController$1.call(GradleBuildController.java:78) 
    at org.gradle.internal.invocation.GradleBuildController$1.call(GradleBuildController.java:75) 
    at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:152) 
    at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:100) 
    at org.gradle.internal.invocation.GradleBuildController.run(GradleBuildController.java:75) 
    at org.gradle.tooling.internal.provider.runner.BuildModelActionRunner.run(BuildModelActionRunner.java:53) 
    at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35) 
    at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35) 
    at org.gradle.tooling.internal.provider.ValidatingBuildActionRunner.run(ValidatingBuildActionRunner.java:32) 
    at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$1.run(RunAsBuildOperationBuildActionRunner.java:43) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) 
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) 
    at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner.run(RunAsBuildOperationBuildActionRunner.java:40) 
    at org.gradle.tooling.internal.provider.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:51) 
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:47) 
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:30) 
    at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:39) 
    at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:25) 
    at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:80) 
    at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:53) 
    at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:57) 
    at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:32) 
    at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:36) 
    at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:25) 
    at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:43) 
    at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:29) 
    at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:64) 
    at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:29) 
    at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:59) 
    at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:44) 
    at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:45) 
    at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:30) 
    at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:67) 
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74) 
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72) 
    at org.gradle.util.Swapper.swap(Swapper.java:38) 
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.LogAndCheckHealth.execute(LogAndCheckHealth.java:55) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:62) 
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:82) 
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50) 
    at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:295) 
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63) 
    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46) 
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55) 
    at java.base/java.lang.Thread.run(Thread.java:844) 

इस कोड को पूरी तरह से संकलित जब मैं List.nil() साथ मानकों की जगह, यही कारण है कि मेरा मानना ​​है कि मुद्दा पैरामीटर से संबंधित है। (Flow वर्ग से)

public void incl(int x) { 
    Assert.check(currentState != BitsState.UNKNOWN); 
    Assert.check(x >= 0); // <-- this line 
    sizeTo((x >>> wordshift) + 1); 
    bits[x >>> wordshift] = bits[x >>> wordshift] | 
     (1 << (x & wordmask)); 
    currentState = BitsState.NORMAL; 
} 

visitMethodDef कहा जाता है::

//important part in method visitMethodDef 
for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { 
    JCVariableDecl def = l.head; 
    scan(def); 
    Assert.check((def.sym.flags() & PARAMETER) != 0, "Method parameter without PARAMETER flag"); 
    /* If we are executing the code from Gen, then there can be 
    * synthetic or mandated variables, ignore them. 
    */ 
    initParam(def); 
} 

जो initParam कॉल:

protected void initParam(JCVariableDecl def) { 
    inits.incl(def.sym.adr); 
    uninits.excl(def.sym.adr); 
} 

तो अगर

निम्नलिखित कोड क्या अपवाद फेंकता है मैं सही ढंग से समझता हूं, पैरामीटर sym.adr < 0. मैन्युअल रूप से Symbol बना रहा है और adr फ़ील्ड को 0 से अधिक कुछ पर सेट करने के लिए काम नहीं करता है।

उत्पन्न कोड (MethodDecl#toString) मान्य है:

public static java.lang.String test(java.lang.String arg) { 
    System.out.println("Running test method!"); 
    return new java.lang.String("Hello!"); 
} 

तो संक्षेप में प्रस्तुत करने: एक java.lang.AssertionError मानकों के साथ एक उत्पन्न विधि संकलन और मैं अनिश्चित है कि यह कैसे तय करने के लिए कर रहा हूँ, जबकि फेंक दिया है।

Answer 1

मैं उत्पन्न एक MethodSymbol बनाना, जिनका Treemaker :: MethodDef (MethodSymbol, JCTree.JCBlock) के साथ एक नया JCTree.JCMethodDecl बनाने के लिए उपयोग कर रहा है, और उन्हें पैरामीटर सेट करने के लिए पुनरावृत्ति द्वारा, कार्यात्मक मापदंडों पाने के लिए प्रबंधित किया है उनके 0 से adr (जिसे स्वीकार किया जाता है, और @Piotr Wilkin द्वारा वर्णित spec में कुछ भी मुझे विश्वास करने के लिए प्रेरित करता है कि यह वैध नहीं होना चाहिए)।

// maker is a TreeMaker instance 
// sym is a Symbol.MethodSymbol instance 
// body is a JCTree.JCBlock instance 
JCTree.JCMethodDecl decl = maker.MethodDef(sym, body); 
decl.params.forEach(p -> { 
    p.sym.adr = 0; 
}); 

मुझे लगता है कारण यह काम करता है, इसलिए है क्योंकि javac नए प्रतीकों बनाने के लिए (के बाद से एक पहले से मौजूद है) का प्रयास नहीं करेंगे, और VarSymbols (JCTree.JCVariableDecl का प्रतीक क्षेत्र) परिवर्तनशील हैं।इसके अलावा, जावाक कोड खोजना वैसे भी इसे ओवरराइड करने का थोड़ा प्रयास दिखाता है।

Answer 2

वास्तव में, Symbol वर्ग के लिए JavaDoc बताता है कि adr क्षेत्र के लिए प्रयोग किया जाता है:

The variable's address. Used for different purposes during flow analysis, translation and code generation. Flow analysis: If this is a blank final or local variable, its sequence number. Translation: If this is a private field, its access number. Code generation: If this is a local variable, its logical slot number.

इसकी डिफ़ॉल्ट मान जो मूल रूप से आधार-प्रकार null के बराबर है, तो क्या -1 है, आप semantically (हालांकि तकनीकी रूप से नहीं) एक NullPointerException मिल रहा है। उपर्युक्त दस्तावेज (और शायद कुछ रिवर्स इंजीनियरिंग के अनुसार, पैरामीटर स्थिति को भरने की आवश्यकता है, क्योंकि आप आंतरिक एपीआई का उपयोग कर रहे हैं)।