# Compiler Internal Error: Couldn't inline method call

**URL:** <https://discuss.kotlinlang.org/t/compiler-internal-error-couldnt-inline-method-call/7503>\
**Category:** Uncategorized\
**Created:** [April 21, 2018, 2:40am UTC](https://discuss.kotlinlang.org/t/compiler-internal-error-couldnt-inline-method-call/7503 "2018-04-21T02:40:45Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Faark](https://avatars.discourse-cdn.com/v4/letter/f/9e8a1a/32.png) [@Faark](https://discuss.kotlinlang.org/u/Faark)\
**Post date:** [April 21, 2018, 2:40am UTC](https://discuss.kotlinlang.org/t/compiler-internal-error-couldnt-inline-method-call/7503/1 "2018-04-21T02:40:45Z")

</div>

The following code produces _[Internal Error] org.jetbrains.kotlin.codegen.CompilationException: Back-end (JVM) Internal error_ on build. I don’t see anything technically wrong with this stripped down code snipped. Am i missing something, or is this actually a compiler bug?

```auto
inline fun <T>safe(action: () -> T): T{
    try{
        return action()
    }catch(ex: Exception){
        try{
            action()
        }catch(ignored: Exception){
        }
        throw Exception("failed", ex)
    }finally{
    }
}

fun test(factory: () -> Int): Int{
    safe {
        return factory()
    }
}

fun main(args: Array<String>) {
    val t = test({ 42 })
    println("Hello, $t!")
}
```

[try.kotlinlang.org](http://try.kotlinlang.org) responds with

> Can’t get program output

> **Error details from IntelliJ with kotlinc-jvm 1.2.31 (JRE 9+181)**
>
> ```
> Error:Kotlin: [Internal Error] org.jetbrains.kotlin.codegen.CompilationException: Back-end (JVM) Internal error: Couldn't inline method call 'safe' into
> public fun test(factory: () -> kotlin.Int): kotlin.Int defined in root package in file main.kt
> fun test(factory: () -> Int): Int{
> safe {
> return factory()
> }
> }
> Cause: safe (Lkotlin/jvm/functions/Function0;)Ljava/lang/Object;:
> TRYCATCHBLOCK L0 L1 L2 java/lang/Exception
> TRYCATCHBLOCK L3 L4 L5 java/lang/Exception
> TRYCATCHBLOCK L6 L7 L5 java/lang/Exception
> TRYCATCHBLOCK L3 L4 L8 null
> TRYCATCHBLOCK L6 L9 L8 null
> TRYCATCHBLOCK L10 L11 L8 null
> TRYCATCHBLOCK L12 L13 L8 null
> L14
> L15
> ALOAD 0
> LDC "action"
> INVOKESTATIC kotlin/jvm/internal/Intrinsics.checkParameterIsNotNull (Ljava/lang/Object;Ljava/lang/String;)V
> L16
> LINENUMBER 87 L16
> L3
> NOP
> L17
> LINENUMBER 88 L17
> ALOAD 0
> INVOKEINTERFACE kotlin/jvm/functions/Function0.invoke ()Ljava/lang/Object;
> ASTORE 2
> L4
> ICONST_1
> INVOKESTATIC kotlin/jvm/internal/InlineMarker.finallyStart (I)V
> L18
> ICONST_1
> INVOKESTATIC kotlin/jvm/internal/InlineMarker.finallyEnd (I)V
> ALOAD 2
> ARETURN
> L6
> L19
> L7
> L9
> ICONST_1
> INVOKESTATIC kotlin/jvm/internal/InlineMarker.finallyStart (I)V
> L20
> ICONST_1
> INVOKESTATIC kotlin/jvm/internal/InlineMarker.finallyEnd (I)V
> GOTO L21
> L10
> L5
> L22
> LINENUMBER 89 L22
> ASTORE 2
> L23
> L24
> LINENUMBER 90 L24
> L0
> NOP
> L25
> LINENUMBER 91 L25
> ALOAD 0
> INVOKEINTERFACE kotlin/jvm/functions/Function0.invoke ()Ljava/lang/Object;
> POP
> L26
> L1
> GOTO L27
> L2
> L28
> LINENUMBER 92 L28
> ASTORE 3
> L29
> L30
> L31
> L32
> LINENUMBER 93 L32
> L27
> L33
> LINENUMBER 94 L33
> NEW java/lang/Exception
> DUP
> LDC "failed"
> ALOAD 2
> CHECKCAST java/lang/Throwable
> INVOKESPECIAL java/lang/Exception.<init> (Ljava/lang/String;Ljava/lang/Throwable;)V
> CHECKCAST java/lang/Throwable
> ATHROW
> L34
> L35
> L11
> ICONST_1
> INVOKESTATIC kotlin/jvm/internal/InlineMarker.finallyStart (I)V
> L36
> ICONST_1
> INVOKESTATIC kotlin/jvm/internal/InlineMarker.finallyEnd (I)V
> GOTO L21
> L12
> L8
> ASTORE 2
> L13
> L37
> ICONST_1
> INVOKESTATIC kotlin/jvm/internal/InlineMarker.finallyStart (I)V
> L38
> ICONST_1
> INVOKESTATIC kotlin/jvm/internal/InlineMarker.finallyEnd (I)V
> L39
> ALOAD 2
> ATHROW
> L40
> LINENUMBER 96 L40
> L21
> L41
> LINENUMBER 97 L41
> GETSTATIC kotlin/Unit.INSTANCE : Lkotlin/Unit;
> ARETURN
> L42
> LOCALVARIABLE ignored Ljava/lang/Exception; L29 L31 3
> LOCALVARIABLE ex Ljava/lang/Exception; L23 L35 2
> LOCALVARIABLE action Lkotlin/jvm/functions/Function0; L14 L42 0
> LOCALVARIABLE $i$f$safe I L14 L42 1
> MAXSTACK = 4
> MAXLOCALS = 4
> Cause: org.jetbrains.org.objectweb.asm.tree.VarInsnNode cannot be cast to org.jetbrains.org.objectweb.asm.tree.LdcInsnNode
> File being compiled at position: (100,5) in C:/Users/Faark/Documents/IdeaProjects/kotlinTest/src/main.kt
> The root cause was thrown at: inlineCodegenUtils.kt:365
> at org.jetbrains.kotlin.codegen.inline.InlineCodegen.throwCompilationException(InlineCodegen.kt:135)
> at org.jetbrains.kotlin.codegen.inline.InlineCodegen.performInline(InlineCodegen.kt:178)
> at org.jetbrains.kotlin.codegen.inline.PsiInlineCodegen.genCallInner(InlineCodegen.kt:671)
> at org.jetbrains.kotlin.codegen.CallGenerator$DefaultImpls.genCall(CallGenerator.kt:106)
> at org.jetbrains.kotlin.codegen.inline.PsiInlineCodegen.genCall(InlineCodegen.kt:652)
> at org.jetbrains.kotlin.codegen.ExpressionCodegen.invokeMethodWithArguments(ExpressionCodegen.java:2324)
> at org.jetbrains.kotlin.codegen.ExpressionCodegen.invokeMethodWithArguments(ExpressionCodegen.java:2275)
> at org.jetbrains.kotlin.codegen.Callable$invokeMethodWithArguments$1.invoke(Callable.kt:44)
> at org.jetbrains.kotlin.codegen.Callable$invokeMethodWithArguments$1.invoke(Callable.kt:23)
> at org.jetbrains.kotlin.codegen.OperationStackValue.putSelector(StackValue.kt:75)
> at org.jetbrains.kotlin.codegen.StackValueWithLeaveTask.putSelector(StackValue.kt:67)
> at org.jetbrains.kotlin.codegen.StackValue.put(StackValue.java:105)
> at org.jetbrains.kotlin.codegen.StackValue.put(StackValue.java:98)
> at org.jetbrains.kotlin.codegen.ExpressionCodegen.putStackValue(ExpressionCodegen.java:354)
> at org.jetbrains.kotlin.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:339)
> at org.jetbrains.kotlin.codegen.ExpressionCodegen.returnExpression(ExpressionCodegen.java:1590)
> at org.jetbrains.kotlin.codegen.FunctionGenerationStrategy$FunctionDefault.doGenerateBody(FunctionGenerationStrategy.java:58)
> at org.jetbrains.kotlin.codegen.FunctionGenerationStrategy$CodegenBased.generateBody(FunctionGenerationStrategy.java:78)
> at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethodBody(FunctionCodegen.java:569)
> at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethodBody(FunctionCodegen.java:332)
> at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethod(FunctionCodegen.java:298)
> at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethod(FunctionCodegen.java:176)
> at org.jetbrains.kotlin.codegen.FunctionCodegen.gen(FunctionCodegen.java:147)
> at org.jetbrains.kotlin.codegen.MemberCodegen.genSimpleMember(MemberCodegen.java:210)
> at org.jetbrains.kotlin.codegen.PackagePartCodegen.generateBody(PackagePartCodegen.java:95)
> at org.jetbrains.kotlin.codegen.MemberCodegen.generate(MemberCodegen.java:142)
> at org.jetbrains.kotlin.codegen.PackageCodegenImpl.generateFile(PackageCodegenImpl.java:127)
> at org.jetbrains.kotlin.codegen.PackageCodegenImpl.generate(PackageCodegenImpl.java:66)
> at org.jetbrains.kotlin.codegen.DefaultCodegenFactory.generatePackage(CodegenFactory.kt:97)
> at org.jetbrains.kotlin.codegen.DefaultCodegenFactory.generateModule(CodegenFactory.kt:68)
> at org.jetbrains.kotlin.codegen.KotlinCodegenFacade.doGenerateFiles(KotlinCodegenFacade.java:47)
> at org.jetbrains.kotlin.codegen.KotlinCodegenFacade.compileCorrectFiles(KotlinCodegenFacade.java:39)
> at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.generate(KotlinToJVMBytecodeCompiler.kt:454)
> at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:150)
> at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:161)
> at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:63)
> at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:108)
> at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:52)
> at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:92)
> at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$$inlined$ifAlive$lambda$1.invoke(CompileServiceImpl.kt:389)
> at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$$inlined$ifAlive$lambda$1.invoke(CompileServiceImpl.kt:97)
> at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:909)
> at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:97)
> at org.jetbrains.kotlin.daemon.common.DummyProfiler.withMeasure(PerfUtils.kt:137)
> at org.jetbrains.kotlin.daemon.CompileServiceImpl.checkedCompile(CompileServiceImpl.kt:939)
> at org.jetbrains.kotlin.daemon.CompileServiceImpl.doCompile(CompileServiceImpl.kt:908)
> at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:387)
> at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:564)
> at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:355)
> at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
> at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
> at java.base/java.security.AccessController.doPrivileged(Native Method)
> at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
> at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:567)
> at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:800)
> at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:682)
> at java.base/java.security.AccessController.doPrivileged(Native Method)
> at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:681)
> at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
> at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
> at java.base/java.lang.Thread.run(Thread.java:844)
> Caused by: java.lang.ClassCastException: org.jetbrains.org.objectweb.asm.tree.VarInsnNode cannot be cast to org.jetbrains.org.objectweb.asm.tree.LdcInsnNode
> at org.jetbrains.kotlin.codegen.inline.InlineCodegenUtilsKt.getConstant(inlineCodegenUtils.kt:365)
> at org.jetbrains.kotlin.codegen.inline.InternalFinallyBlockInliner.findFinallyBlockBody(InternalFinallyBlockInliner.java:452)
> at org.jetbrains.kotlin.codegen.inline.InternalFinallyBlockInliner.processInlineFunFinallyBlocks(InternalFinallyBlockInliner.java:169)
> at org.jetbrains.kotlin.codegen.inline.InternalFinallyBlockInliner.processInlineFunFinallyBlocks(InternalFinallyBlockInliner.java:81)
> at org.jetbrains.kotlin.codegen.inline.MethodInliner.doInline(MethodInliner.kt:118)
> at org.jetbrains.kotlin.codegen.inline.MethodInliner.doInline(MethodInliner.kt:71)
> at org.jetbrains.kotlin.codegen.inline.InlineCodegen.inlineCall(InlineCodegen.kt:289)
> at org.jetbrains.kotlin.codegen.inline.InlineCodegen.performInline(InlineCodegen.kt:169)
> ... 62 more
> 
> ```

---

<div class="post-metadata">

**Author:** ![tieskedh](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.kotlinlang.org/tieskedh/32/2816_2.png) [@tieskedh](https://discuss.kotlinlang.org/u/tieskedh)\
**Post date:** [April 21, 2018, 8:15pm UTC](https://discuss.kotlinlang.org/t/compiler-internal-error-couldnt-inline-method-call/7503/2 "2018-04-21T20:15:10Z")

</div>

the reason why it doesn’t work, I don’t know, but about your implementation, don’t you mean:

```
fun test(factory: () -> Int) = safe {
    factory()
}

```

As your return says to return from test instead of the lambda you passed to safe.  
Ps. If I catched your intention correctly, you can put crossinline in front of your lambda-parameter, such that so called non-local returns aren’t even allowed.

---

<div class="post-metadata">

**Author:** ![ilya.gorbunov](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.kotlinlang.org/ilya.gorbunov/32/1645_2.png) [@ilya.gorbunov](https://discuss.kotlinlang.org/u/ilya.gorbunov)\
**Post date:** [April 23, 2018, 11:48am UTC](https://discuss.kotlinlang.org/t/compiler-internal-error-couldnt-inline-method-call/7503/3 "2018-04-23T11:48:30Z")

</div>

Usually internal compiler error is a result of some bug, so you can report that right to our tracker: [http://kotl.in/issue](http://kotl.in/issue)

---

<div class="post-metadata">

**Author:** ![Beholder](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.kotlinlang.org/beholder/32/2078_2.png) [@Beholder](https://discuss.kotlinlang.org/u/Beholder)\
**Post date:** [April 23, 2018, 11:57am UTC](https://discuss.kotlinlang.org/t/compiler-internal-error-couldnt-inline-method-call/7503/4 "2018-04-23T11:57:31Z")

</div>

Empty `finally` section causes confusion to compiler. But do you really need it?