Fix inlining of functions with matching JVM signatures in same package

When two functions with matching JVM signatures in the same package
were inlined sequentially, inliner could take a wrong method body from
the cache due to MethodId clash. This manifested with inline classes,
but also was possible with some legal Kotlin overloads with matching
erasure.

Use internal name of the corresponding implementation owner class
instead of FQN of the containing declaration. Such MethodIds can't match
accidentally, because corresponding JVM method signatures would clash.

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/InlineCache.kt

@@ -18,10 +18,9 @@ package org.jetbrains.kotlin.codegen.inline
 
 import com.intellij.util.containers.SLRUMap
 import org.jetbrains.kotlin.name.ClassId
-import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.org.objectweb.asm.commons.Method
 
-data class MethodId(val containingFqName: FqName, val method: Method)
+data class MethodId(val ownerInternalName: String, val method: Method)
 
 class InlineCache {
     val classBytes: SLRUMap<ClassId, ByteArray> = SLRUMap(30, 20)

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/InlineCodegen.kt

@@ -13,7 +13,10 @@ import org.jetbrains.kotlin.codegen.*
 import org.jetbrains.kotlin.codegen.AsmUtil.getMethodAsmFlags
 import org.jetbrains.kotlin.codegen.AsmUtil.isPrimitive
 import org.jetbrains.kotlin.codegen.context.ClosureContext
-import org.jetbrains.kotlin.codegen.coroutines.*
+import org.jetbrains.kotlin.codegen.coroutines.createMethodNodeForCoroutineContext
+import org.jetbrains.kotlin.codegen.coroutines.createMethodNodeForIntercepted
+import org.jetbrains.kotlin.codegen.coroutines.createMethodNodeForSuspendCoroutineUninterceptedOrReturn
+import org.jetbrains.kotlin.codegen.coroutines.isBuiltInSuspendCoroutineUninterceptedOrReturnInJvm
 import org.jetbrains.kotlin.codegen.intrinsics.bytecode
 import org.jetbrains.kotlin.codegen.intrinsics.classId
 import org.jetbrains.kotlin.codegen.state.GenerationState
@@ -500,7 +503,8 @@ abstract class InlineCodegen<out T : BaseExpressionCodegen>(
             else
                 mangleSuspendInlineFunctionAsmMethodIfNeeded(functionDescriptor, jvmSignature.asmMethod)
 
-            val methodId = MethodId(DescriptorUtils.getFqNameSafe(functionDescriptor.containingDeclaration), asmMethod)
+            val owner = state.typeMapper.mapImplementationOwner(functionDescriptor)
+            val methodId = MethodId(owner.internalName, asmMethod)
             val directMember = getDirectMemberAndCallableFromObject(functionDescriptor)
             if (!isBuiltInArrayIntrinsic(functionDescriptor) && directMember !is DeserializedCallableMemberDescriptor) {
                 return sourceCompilerForInline.doCreateMethodNodeFromSource(functionDescriptor, jvmSignature, callDefault, asmMethod)

compiler/backend/src/org/jetbrains/kotlin/codegen/state/KotlinTypeMapper.java

@@ -20,6 +20,7 @@ import org.jetbrains.kotlin.codegen.*;
 import org.jetbrains.kotlin.codegen.binding.CodegenBinding;
 import org.jetbrains.kotlin.codegen.binding.MutableClosure;
 import org.jetbrains.kotlin.codegen.coroutines.CoroutineCodegenUtilKt;
+import org.jetbrains.kotlin.codegen.inline.FictitiousArrayConstructor;
 import org.jetbrains.kotlin.codegen.signature.AsmTypeFactory;
 import org.jetbrains.kotlin.codegen.signature.BothSignatureWriter;
 import org.jetbrains.kotlin.codegen.signature.JvmSignatureWriter;
@@ -252,6 +253,10 @@ public class KotlinTypeMapper {
             return descriptor.getContainingDeclaration().getName().asString();
         }
 
+        if (directMember instanceof FictitiousArrayConstructor) {
+            return "kotlin.Array";
+        }
+
         throw new RuntimeException("Could not find package member for " + descriptor +
                                    " in package fragment " + descriptor.getContainingDeclaration());
     }

compiler/testData/compileKotlinAgainstCustomBinaries/inlineFunctionsWithMatchingJvmSignatures/library/1.kt

@@ -0,0 +1,3 @@
+package lib
+
+inline fun Int.toString(ignored: Int) = toString()

compiler/testData/compileKotlinAgainstCustomBinaries/inlineFunctionsWithMatchingJvmSignatures/library/2.kt

@@ -0,0 +1,5 @@
+package lib
+
+inline class J(val value: Int)
+
+inline fun J.toString(ignored: Int) = "J$value"

compiler/testData/compileKotlinAgainstCustomBinaries/inlineFunctionsWithMatchingJvmSignatures/output.txt

@@ -0,0 +1,11 @@
+warning: ATTENTION!
+This build uses unsafe internal compiler arguments:
+
+-XXLanguage:+InlineClasses
+
+This mode is not recommended for production use,
+as no stability/compatibility guarantees are given on
+compiler or generated code. Use it at your own risk!
+
+warning: following manually enabled features will force generation of pre-release binaries: InlineClasses
+OK

compiler/testData/compileKotlinAgainstCustomBinaries/inlineFunctionsWithMatchingJvmSignatures/source.kt

@@ -0,0 +1,8 @@
+import lib.*
+
+fun run() {
+    val test1 = 42.toString(10)
+    val test2 = J(42).toString(10)
+    if (test1 != "42") throw AssertionError(test1)
+    if (test2 != "J42") throw AssertionError(test2)
+}

compiler/tests/org/jetbrains/kotlin/jvm/compiler/CompileKotlinAgainstCustomBinariesTest.kt

@@ -129,8 +129,7 @@ class CompileKotlinAgainstCustomBinariesTest : AbstractKotlinCompilerIntegration
         try {
             System.setProperty(TEST_IS_PRE_RELEASE_SYSTEM_PROPERTY, value.toString())
             block()
-            }
+        } finally {
-            finally {
             System.clearProperty(TEST_IS_PRE_RELEASE_SYSTEM_PROPERTY)
         }
 
@@ -207,10 +206,14 @@ class CompileKotlinAgainstCustomBinariesTest : AbstractKotlinCompilerIntegration
     }
 
     fun testMissingDependencyConflictingLibraries() {
-        val library1 = copyJarFileWithoutEntry(compileLibrary("library1"),
+        val library1 = copyJarFileWithoutEntry(
-                                               "a/A.class", "a/A\$Inner.class", "a/AA.class", "a/AA\$Inner.class")
+            compileLibrary("library1"),
-        val library2 = copyJarFileWithoutEntry(compileLibrary("library2"),
+            "a/A.class", "a/A\$Inner.class", "a/AA.class", "a/AA\$Inner.class"
-                                               "a/A.class", "a/A\$Inner.class", "a/AA.class", "a/AA\$Inner.class")
+        )
+        val library2 = copyJarFileWithoutEntry(
+            compileLibrary("library2"),
+            "a/A.class", "a/A\$Inner.class", "a/AA.class", "a/AA\$Inner.class"
+        )
         compileKotlin("source.kt", tmpdir, listOf(library1, library2))
     }
 
@@ -248,16 +251,20 @@ class CompileKotlinAgainstCustomBinariesTest : AbstractKotlinCompilerIntegration
         withPreRelease(true) {
             val library = compileLibrary("library")
             val someStableReleasedVersion = LanguageVersion.values().first().also { assert(it.isStable) }
-            compileKotlin("source.kt", tmpdir, listOf(library), K2JVMCompiler(),
+            compileKotlin(
-                          listOf("-language-version", someStableReleasedVersion.versionString))
+                "source.kt", tmpdir, listOf(library), K2JVMCompiler(),
+                listOf("-language-version", someStableReleasedVersion.versionString)
+            )
         }
     }
 
     fun testPreReleaseCompilerAgainstPreReleaseLibraryLatestStable() {
         withPreRelease(true) {
             val library = compileLibrary("library")
-            compileKotlin("source.kt", tmpdir, listOf(library), K2JVMCompiler(),
+            compileKotlin(
-                          listOf("-language-version", LanguageVersion.LATEST_STABLE.versionString))
+                "source.kt", tmpdir, listOf(library), K2JVMCompiler(),
+                listOf("-language-version", LanguageVersion.LATEST_STABLE.versionString)
+            )
         }
     }
 
@@ -277,8 +284,7 @@ class CompileKotlinAgainstCustomBinariesTest : AbstractKotlinCompilerIntegration
                 strings.map { string ->
                     String(string.toByteArray().map { x -> x xor 42 }.toTypedArray().toByteArray())
                 }.toTypedArray()
-            }
+            } else null
-            else null
         })
     }
 
@@ -363,8 +369,7 @@ class CompileKotlinAgainstCustomBinariesTest : AbstractKotlinCompilerIntegration
 
         if (GENERATE_SMAP) {
             assertEquals(expected, debugInfo)
-        }
+        } else {
-        else {
             assertEquals(null, debugInfo)
         }
     }
@@ -431,10 +436,14 @@ class CompileKotlinAgainstCustomBinariesTest : AbstractKotlinCompilerIntegration
                 assertEquals(4, removedCounter)
                 resultBytes
             })
-        compileKotlin("source.kt", tmpdir, listOf(library), K2JVMCompiler(),
+        compileKotlin(
-                      additionalOptions = options)
+            "source.kt", tmpdir, listOf(library), K2JVMCompiler(),
-        val classLoader = URLClassLoader(arrayOf(library.toURI().toURL(), tmpdir.toURI().toURL()),
+            additionalOptions = options
-                                         ForTestCompileRuntime.runtimeJarClassLoader())
+        )
+        val classLoader = URLClassLoader(
+            arrayOf(library.toURI().toURL(), tmpdir.toURI().toURL()),
+            ForTestCompileRuntime.runtimeJarClassLoader()
+        )
         @Suppress("UNCHECKED_CAST")
         val result = classLoader
             .loadClass("SourceKt")
@@ -443,6 +452,18 @@ class CompileKotlinAgainstCustomBinariesTest : AbstractKotlinCompilerIntegration
         assertEquals(result[0], result[1])
     }
 
+    fun testInlineFunctionsWithMatchingJvmSignatures() {
+        val library = compileLibrary(
+            "library",
+            additionalOptions = listOf("-XXLanguage:+InlineClasses"),
+            checkKotlinOutput = { _ -> }
+        )
+        compileKotlin("source.kt", tmpdir, listOf(library), additionalOptions = listOf("-XXLanguage:+InlineClasses"))
+
+        URLClassLoader(arrayOf(library.toURI().toURL(), tmpdir.toURI().toURL()), ForTestCompileRuntime.runtimeJarClassLoader())
+            .loadClass("SourceKt").getDeclaredMethod("run").invoke(null)
+    }
+
     fun testClassFromJdkInLibrary() {
         val library = compileLibrary("library")
         compileKotlin("source.kt", tmpdir, listOf(library))
@@ -503,9 +524,11 @@ class CompileKotlinAgainstCustomBinariesTest : AbstractKotlinCompilerIntegration
 
     fun testInternalFromFriendModuleCommon() {
         val library = compileCommonLibrary("library")
-        compileKotlin("source.kt", tmpdir, listOf(library), K2MetadataCompiler(), listOf(
+        compileKotlin(
+            "source.kt", tmpdir, listOf(library), K2MetadataCompiler(), listOf(
                 // TODO: "-Xfriend-paths=${library.path}"
-        ))
+            )
+        )
     }
 
     companion object {
@@ -514,7 +537,13 @@ class CompileKotlinAgainstCustomBinariesTest : AbstractKotlinCompilerIntegration
             val writer = ClassWriter(0)
             var removedCounter = 0
             ClassReader(bytes).accept(object : ClassVisitor(Opcodes.ASM5, writer) {
-                override fun visitMethod(access: Int, name: String?, desc: String?, signature: String?, exceptions: Array<out String>?): MethodVisitor {
+                override fun visitMethod(
+                    access: Int,
+                    name: String?,
+                    desc: String?,
+                    signature: String?,
+                    exceptions: Array<out String>?
+                ): MethodVisitor {
                     val superMV = super.visitMethod(access, name, desc, signature, exceptions)
                     return object : MethodNode(Opcodes.ASM5, access, name, desc, signature, exceptions) {
                         override fun visitEnd() {
@@ -537,7 +566,8 @@ class CompileKotlinAgainstCustomBinariesTest : AbstractKotlinCompilerIntegration
                 && insn.opcode == Opcodes.INVOKESTATIC
                 && insn.owner == "kotlin/jvm/internal/InlineMarker"
                 && insn.name == "mark"
-                && insn.previous.intConstant in 0..1) listOf(insn, insn.previous)
+                && insn.previous.intConstant in 0..1
+            ) listOf(insn, insn.previous)
             else emptyList()
 
         // -----