Kotlinx-murmurhash - Kotlin Multiplatform (KMP) library for hashing using MurmurHash

Last update: Aug 9, 2022

kotlinx-murmurhash

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Kotlin Multiplatform (KMP) library for MurmurHash, a non-cryptographic hash function for general hash-based lookup focused on simplicity and performance.

Usage

Add the dependency in build.gradle.kts:

kotlin {
    sourceSets {
        val commonMain by getting {
            dependencies {
                implementation("com.goncalossilva:murmurhash:<version>")
            }
        }
    }
}

Use the provided MurmurHash* classes and hash* hashing functions.

Example

MurmurHash3().hash32x86(string.encodeToByteArray())

Contributing

Pull requests are welcome! See MurmurHash3Test for an example of how to leverage hashes computed by the canonical C++ implementation for testing.

Feel free to contribute earlier versions, such as MurmurHash2 and MurmurHash1.

Acknowledgements

Testing using a wordlist and pre-computed hashes of the canonical C++ implementation is inspired by @sangupta's murmur Java implementation.

License

Released under the MIT License.

GitHub

https://github.com/goncalossilva/kotlinx-murmurhash
Comments
  • 1. getUInt returns invalid values

    Hi @goncalossilva,

    There's currently a bug in getUInt when reading values that are negative bytes.

    For example, consider the following:

    val bytes = byteArrayOf(0x2e, 0xf6.toByte())
    
    println(bytes.getUInt(0)) // prints 46
    println(bytes.getUInt(1)) // prints 4294967286 but should be 246
    

    This looks as simple as just ensuring the value is masked, i.e. private fun ByteArray.getUInt(index: Int) = get(index).toUInt() and 0xffu although I've not throughly tested this. I assume the same needs to be applied to getULong too.

    The test suite is probably not broad enough in terms of the byte values under test; which is why it doesn't pick up this issue. I'm currently in the process of adding an incremental version of murmurhash into my own Multiplatform library, cryptohash and while looking into that came across this test suite from Apache Commons Codec which helped highlight this issue.

    From a testing point of view, with a fix in place, hash32x86 with a zero seed would be expected to return 0x368f9df1 for the 2-byte array above.

    Reviewed by mattmook at 2022-01-22 12:45
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  • 12. Update plugin org.jetbrains.kotlin.multiplatform to v1.7.0

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    Release Notes

    JetBrains/kotlin

    v1.7.0

    Analysis API. FIR
    • KT-50864 Analysis API: ISE: "KtCallElement should always resolve to a KtCallInfo" is thrown on call resolution inside plusAssign target
    • KT-50252 Analysis API: Implement FirModuleResolveStates for libraries
    • KT-50862 Analsysis API: do not create use site subsitution override symbols
    Analysis API. FIR Low Level API
    • KT-50729 Type bound is not fully resolved
    • KT-50728 Lazy resolve of extension function from 'kotlin' package breaks over unresolved type
    • KT-50271 Analysis API: get rid of using FirRefWithValidityCheck
    Backend. Native. Debug
    • KT-50558 K/N Debugger. Error is not displayed in variables view for catch block
    Compiler
    New Features
    • KT-26245 Add ability to specify generic type parameters as not-null
    • KT-45165 Remove JVM target version 1.6
    • KT-27435 Allow implementation by delegation to inlined value of inline class
    • KT-47939 Support method references to functional interface constructors
    • KT-50775 Support IR partial linkage in Kotlin/Native (disabled by default)
    • KT-51737 Kotlin/Native: Remove unnecessary safepoints on watchosArm32 and iosArm32 targets
    • KT-44249 NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER with type usage in higher order function
    Performance Improvements
    • KT-48233 Switching to JVM IR backend increases compilation time by more than 15%
    • KT-51699 Kotlin/Native: runtime has no LTO in debug binaries
    • KT-34466 Use optimized switch over enum only when all entries are constant enum entry expressions
    • KT-50861 FIR: Combination of array set convention and plusAssign works exponentially
    • KT-47171 For loop doesn't avoid boxing with value class iterators (JVM)
    • KT-29199 'next' calls for iterators of merged primitive progressive values are not specialized
    • KT-50585 JVM IR: Array constructor loop should use IINC
    • KT-22429 Optimize 'for' loop code generation for reversed arrays
    • KT-50074 Performance regression in String-based 'when' with single equality clause
    • KT-22334 Compiler backend could generate smaller code for loops using range such as integer..array.size -1
    • KT-35272 Unnecessary null check on unsafe cast after not-null assertion operator
    • KT-27427 Optimize nullable check introduced with 'as' cast
    Fixes
    • KT-46762 Finalize support for jspecify
    • KT-51499 @​file:OptIn doesn't cover override methods
    • KT-52037 FIR: add error in 1.7.0 branch if run with non-compatible plugins
    • KT-46756 Release the K2/JVM compiler in Alpha
    • KT-49715 IR: "IllegalStateException: Function has no body: FUN name:toString" during IR lowering with shadowed extension inside interface
    • KT-45508 False negative ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED on a fake override with an abstract super class member
    • KT-28078 Report error "Public property exposes its private type" for primary constructor properties instead of warning
    • KT-49017 Forbid usages of super or super if in fact it accesses an abstract member
    • KT-38078 Prohibit calling methods from Any with "super" qualifier once they are overridden as abstract in superclass
    • KT-52363 Evaluate impact of qualified this behavior change warnings
    • KT-52561 JVM: Coroutine state machine loses value after a check-induced smart cast
    • KT-52311 java.lang.VerifyError: Bad type on operand stack
    • KT-41124 Inconsistency of exceptions at init block for an enum entry with and without a qualifier name
    • KT-46860 Make safe calls always nullable
    • KT-52503 New green code appeared at the callable reference resolution
    • KT-51925 Native: "IllegalStateException: Symbol for kotlinx.cinterop/CStructVar|null[0] is unbound" caused by inline function
    • KT-49317 "IllegalStateException: Parent of this declaration is not a class: FUN LOCAL_FUNCTION_FOR_LAMBDA" with parameter of suspend type with the default parameter
    • KT-51844 New errors in overload resolution involving vararg extension methods
    • KT-52006 "java.lang.Throwable: Unbalanced tree Exception" on indexing kotlin project
    • KT-51223 Report warning about conflicting inherited members from deserialized dependencies
    • KT-51439 FE 1.0: implement type variance conflict deprecation on qualifier type arguments
    • KT-51433 FE 1.0: implement warnings about label resolve changes
    • KT-51317 Regression in resolution of lambdas where expected type has an extension receiver parameter
    • KT-45935 JVM IR: Add not-null assertion for explicit definitely not-null parameters
    • KT-51818 "ClassCastException: class CoroutineSingletons cannot be cast to class" with suspendCoroutineUninterceptedOrReturn and coroutines
    • KT-51718 JVM / IR: "VerifyError: Bad type on operand stack" caused by nullable variable inside suspend function
    • KT-51927 Native: The symbol of unexpected type encountered during IR deserialization error when multiple libraries have non-conflicting declarations with the same name
    • KT-52394 JVM: Missing annotation on method with value class return type when a subclass is present in the same file in Kotlin 1.7.0-Beta
    • KT-51640 FIR: remove warning about "far from being production ready"
    • KT-45553 FIR: support hiding declaration from star import by as import
    • KT-52404 Prolong deprecation cycle for errors at contravariant usages of star projected argument from Java
    • KT-50734 TYPE_MISMATCH: NonNull parameter with a type of Nullable type argument causes compiler warning
    • KT-51235 JVM / IR: "AbstractMethodError: Receiver class does not define or inherit an implementation of the resolved method" when property with inline class type is overridden to return Nothing?
    • KT-48935 NI: Multiple generic parameter type constraints are not applied as expected when the parameter is of function type
    • KT-49661 NI: No TYPE_INFERENCE_UPPER_BOUND_VIOLATED when argument is inferred by return type
    • KT-50877 Inconsistent flexible type
    • KT-51988 "NPE: getContainingDeclaration…lDeclarationType.REGULAR) must not be null" when using @​BuilderInference with multiple type arguments
    • KT-48890 Revert Opt-In restriction "Overriding methods can only have opt-in annotations that are present on their basic declarations."
    • KT-52035 FIR: add error in 1.7.0 branch if run on JS / Native configuration
    • KT-45461 NI: False negative TYPE_INFERENCE_UPPER_BOUND_VIOLATED when passing an argument to a function with generic constraints
    • KT-52146 JVM IR: "AssertionError: Primitive array expected" on vararg of SAM types with self-type and star projection
    • KT-50730 Implement error for a super class constructor call on a function interface in supertypes list
    • KT-52040 JVM: ClassFormatError Illegal method name "expectFailure$__proxy-0"
    • KT-50845 Postpone rxjava errors reporting in the strict mode till 1.8 due to found broken cases
    • KT-51979 "AssertionError: No modifier list, but modifier has been found by the analyzer" exception on incorrect Java interface override
    • KT-51759 FIR DFA: false positive "Variable must be initialized"
    • KT-50378 Unresolved reference for method in Jsoup library in a kts script file
    • KT-34919 "Visibility is unknown yet" when named parameter in a function type used in a typealias implemented by an abstract class
    • KT-51893 Duplicated [OVERRIDE_DEPRECATION] on overridden properties
    • KT-41034 K2: Change evaluation semantics for combination of safe calls and convention operators
    • KT-51843 Functional interface constructor references are incorrectly allowed in 1.6.20 without any compiler flags
    • KT-51914 False positive RETURN_TYPE_MISMATCH in intellij ultimate
    • KT-51711 Compiler warning is displayed in case there is 'if' else branch used with elvis
    • KT-33517 Kotlin ScriptEngine does not respect async code when using bindings
    • KT-51850 FIR cannot resolve ambiguity with different SinceKotlin/DeprecatedSinceKotlin
    • KT-44705 Deprecate using non-exhaustive if's and when's in rhs of elvis
    • KT-44510 FIR DFA: smartcast after elvis with escaping lambda
    • KT-44879 FIR DFA: Track inc and dec operator calls in preliminary loop visitor
    • KT-51758 FIR: explicit API mode errors should not be reported for effectively internal / private entities
    • KT-51203 FIR: Inconsistent RETURN_TYPE_MISMATCH and TYPE_MISMATCH reporting on functions and properties
    • KT-51624 FIR: false-positive INAPPLICABLE_LATEINIT_MODIFIER for lateinit properties with unresolved types
    • KT-51204 FIR IC: Incremental compilation fails on nested crossinline
    • KT-51798 Fix ISE from IR backend when data class inherits equals/hashCode/toString with incompatible signature
    • KT-46187 FIR: OVERLOAD_RESOLUTION_AMBIGUITY on SAM-converted callable reference to List::plus
    • KT-51761 Incorrect NONE_APPLICABLE in expect class
    • KT-51756 FIR: false positive NO_VALUE_FOR_PARAMETER in expect class delegated constructor call
    • KT-49778 Support cast to DefinitelyNotNull type in Native
    • KT-51441 -Xpartial-linkage option specified in Gradle build script is not passed to Native linker
    • KT-34515 NI: "AssertionError: Base expression was not processed: POSTFIX_EXPRESSION" with double not-null assertion to brackets
    • KT-48546 PSI2IR: "org.jetbrains.kotlin.psi2ir.generators.ErrorExpressionException: null: KtCallExpression" with recursive property access in lazy block
    • KT-28109 "AssertionError: No setter call" for incrementing parenthesized result of indexed access convention operator
    • KT-46136 Unsubstituted return type inferred for a function returning anonymous object upcast to supertype
    • KT-51364 FIR: ambiguity due to String constructors clash
    • KT-51621 FIR: visible VS invisible qualifier conflict
    • KT-50468 FIR compilers fails with CCE when meets top-level destruction
    • KT-51557 Inline stack frame is not shown for default inline lambda
    • KT-51358 OptIn: show default warning/error message in case of empty message argument
    • KT-44152 FIR2IR fails on declarations from java stdlib if java classes are loaded from PSI instead of binaries
    • KT-50949 PSI2IR: NSEE from ArgumentsGenerationUtilsKt.createFunctionForSuspendConversion with providing lambda as argument with suspend type
    • KT-39256 ArrayStoreException with list of anonymous objects with inferred types created in reified extension function
    • KT-39883 Deprecate computing constant values of complex boolean expressions in when condition branches and conditions of loops
    • KT-36952 Exception during codegen: cannot pop operand off an empty stack (reference equality, implicit boxing, type check)
    • KT-51233 AssertionError in JavaLikeCounterLoopBuilder with Compose
    • KT-51254 Verify Error on passing null to type parameter extending inline class
    • KT-50996 [FIR] Support Int -> Long conversion for property initializers
    • KT-51000 [FIR] Support Int -> Long? conversion
    • KT-51003 [FIR] Consider Int -> Long conversion if expected type is type variable
    • KT-51018 [FIR] Wrong type inference if one of constraints is integer literal
    • KT-51446 Metadata serialization crashes with IOOBE when deserializing underlying inline class value with type table enabled
    • KT-50973 Redundant line number mapping for finally block with JVM IR
    • KT-51272 Incompatible types: KClass and callable reference Collection::class
    • KT-51274 "Expected some types" exception on when branch for when expression of erroneous type
    • KT-51229 FIR: private constructor of internal data class treated as internal and not private
    • KT-50750 [FIR] Report UNSUPPORTED on array literals not from annotation classes
    • KT-51200 False EXPOSED_PARAMETER_TYPE for internal type parameter of internal type
    • KT-49804 False positive of UPPER_BOUND_VIOLATED and RETURN_TYPE_MISMATCH
    • KT-51121 Inconsistent SAM behavior in multiple cases causing AbstractMethodError (Kotlin 1.6.10)
    • KT-50136 FIR: syntax error on (T & Any)
    • KT-49465 FIR2IR: support definitely not-null types
    • KT-51357 FIR: error in inference while using integer literal in expected Long position
    • KT-49925 [FIR] Incorrect builder inference (different cases)
    • KT-50542 "IllegalStateException: Type parameter descriptor is not initialized: T declared in sort" with definitely non-null type Any & T in generic constraint
    • KT-51171 FIR: class Error resolution problem
    • KT-51156 Multiplatform linkDebugFramework task throws NoSuchElementException when expect class constructors utilize nested enum constant
    • KT-51017 [FIR] Ambiguity on callable reference between two functions on generic receiver with different bounds
    • KT-51007 [FIR] False positive ILLEGAL_SUSPEND_FUNCTION_CALL if fun interface with suspend function declared in another module
    • KT-50998 [FIR] Int.inv() cal does not considered as compile time call
    • KT-51009 [FIR] Incorrect inference of lambda in position of return
    • KT-50997 [FIR] Incorrect type of typealias for suspend functional type
    • KT-49714 Compiler reports "'operator modifier is inapplicable" if expect class with increment operator is provided via type alias
    • KT-48623 Type nullability enhancement improvements
    • KT-44623 "IllegalStateException: IdSignature is allowed only for PublicApi symbols" when suspending receiver is annotated with something
    • KT-46000 JVM / IR: AssertionError on isSubtypeOfClass check in copyValueParametersToStatic with Compose
    • KT-50211 Annotation Instantiation with default arguments in Native
    • KT-49412 Controversial "type argument is not within its bounds" reported by FIR
    • KT-48044 [FIR] Investigate behavior of UPPER_BOUND_VIOLATED on complex cases
    • KT-37975 Don't show deprecation of enum class itself for its own member
    • KT-50737 Inheritance from SuspendFunction leads to compiler crash
    • KT-50723 Implement a fix of reporting of uninitialized parameter in default values of parameters
    • KT-50749 Implement UNSUPPORTED reporting on array literals inside objects in annotation classes
    • KT-50753 Implement reporting errors on cycles in annotation parameter types
    • KT-50758 Fix inconsistency of exceptions at init block for an enum entry with and without a qualifier name
    • KT-50182 CONST_VAL_NOT_TOP_LEVEL_OR_OBJECT: clarify error message for const in object expression
    • KT-50183 Fix missing apostrophe escapes in compiler error messages
    • KT-50788 FIR: false unsafe call on not-null generic
    • KT-50785 FIR: inconsistent smart cast after comparison with true
    • KT-50858 [FIR LL] FIR in low level mode creates multiple symbols for same declaration
    • KT-50822 Analysis API: make declaration transformers machinery to be a thread safe
    • KT-50972 FIR doesn't report VAL_REASSIGNMENT on synthetic properties
    • KT-50969 FIR: diamond inheritance with different parameter types depends on a supertype order
    • KT-50875 FIR: no smart cast after reassignment with elvis
    • KT-50835 Inline functions with suspend lambdas break the tail-call optimization
    • KT-49485 JVM / IR: StackOverflowError with long when-expression conditions
    • KT-35684 NI: "IllegalStateException: Expected some types" from builder-inference about intersecting empty types on trivial code
    • KT-50776 FIR: ambiguity between Sequence.forEach and Iterable.forEach
    • KT-48908 Error for annotation on parameter type could have distinct ID and message referring 1.6
    • KT-48907 SUPERTYPE_IS_SUSPEND_FUNCTION_TYPE error could have message referring version 1.6
    • KT-50774 FIR2IR: NSEE in case of lambda in enum entry constructor call
    • KT-49016 Drop QUALIFIED_SUPERTYPE_EXTENDED_BY_OTHER_SUPERTYPE diagnostic
    • KT-34338 Parameterless main causes duplicate JVM signature error
    • KT-50577 JVM_IR: No NPE when casting uninitialized value of non-null type to non-null type
    • KT-50476 JVM_IR: NSME when calling 'super.removeAt(Int)' implemented in Java interface as a default method
    • KT-50257 JVM_IR: Incorrect bridge delegate signature for renamed remove(I) causes SOE with Kotlin class inherited from fastutils IntArrayList
    • KT-50470 FIR: inapplicable candidate in delegate inference due to nullability
    • KT-32744 Inefficient compilation of null-safe call (extra null checks, unreachable code)
    Docs & Examples
    • KT-52032 Document performance optimizations of the Kotlin/JVM compiler in 1.7.0
    • KT-49424 Update KEEP for OptIn
    IDE
    Fixes
    • KTIJ-21735 Exception when opening a project
    • KTIJ-17414 UAST: Synthetic enum methods have null return values
    • KTIJ-17444 UAST: Synthetic enum methods are missing nullness annotations
    • KTIJ-19043 UElement#comments is empty for a Kotlin property with a getter
    • KTIJ-10031 IDE fails to suggest a project declaration import if the name clashes with internal declaration with implicit import from stdlib (ex. @​Serializable)
    • KTIJ-21515 Load JVM target 1.6 as 1.8 in Maven projects
    • KTIJ-21151 Exception about wrong read access from "Java overriding methods searcher" with Kotlin overrides
    • KTIJ-20736 NoClassDefFoundError: Could not initialize class org.jetbrains.kotlin.idea.roots.KotlinNonJvmOrderEnumerationHandler. Kotlin plugin 1.7 fails to start
    • KT-50111 Resolving into KtUltraLightMethod
    • KTIJ-21063 IDE highlighting: False positive error "Context receivers should be enabled explicitly"
    • KTIJ-20810 NoClassDefFoundError: org/jetbrains/kotlin/idea/util/SafeAnalyzeKt errors in 1.7.0-master-212 kotlin plugin on project open
    • KTIJ-19088 KotlinUFunctionCallExpression.resolve() returns null for calls to @​JvmSynthetic functions
    • KTIJ-17869 KotlinUFunctionCallExpression.resolve() returns null for instantiations of local classes with default constructors
    • KTIJ-21061 UObjectLiteralExpression.getExpressionType() returns the base class type for Kotlin object literals instead of the anonymous class type
    • KTIJ-20200 UAST: @​Deprecated(level=HIDDEN) constructors are not returning UMethod.isConstructor=true
    • KTIJ-19624 NoDescriptorForDeclarationException on iosTest.kt.vm
    IDE. Code Style, Formatting
    • KTIJ-20554 Introduce some code style for definitely non-null types
    IDE. Completion
    • KTIJ-14740 Multiplatform declaration actualised in an intermediate source set is shown twice in a completion popup called in the source set
    IDE. Debugger
    • KTIJ-20815 MPP Debugger: Evaluation of expect function for the project with intermediate source set may fail with java.lang.NoSuchMethodError
    IDE. Decompiler, Indexing, Stubs
    • KTIJ-21472 "java.lang.IllegalStateException: Could not read file" exception on indexing invalid class file
    • KTIJ-20802 Definitely Not-Null types: "UpToDateStubIndexMismatch: PSI and index do not match" plugin error when trying to use library function with T&Any
    • KT-51248 Function and parameter names with special symbols have to backticked
    IDE. FIR
    • KTIJ-20443 FIR IDE: Work in Dumb mode
    • KTIJ-21374 FIR IDE: Incorrect highlighting for operators
    • KTIJ-21013 FIR IDE: Inconsistent smartcasts highlighting
    • KTIJ-21343 FIR IDE: Navigation from explicit invoke call does not work
    • KTIJ-20852 FIR IDE: Exception when checking isInheritor on two classes in different modules
    • KTIJ-21021 FIR IDE: Completion of extension function does not work on nullable receiver
    • KTIJ-20637 FIR IDE: Strange exception while commenting-uncommenting FirReferenceResolveHelper.kt
    • KTIJ-20971 FIR IDE: "Parameter Info" shows parameters of uncallable methods
    IDE. Gradle Integration
    • KTIJ-21807 Gradle to IDEA import: language and API version settings are not imported for Native facet
    • KTIJ-21692 Kotlin Import Test maintenance: 1.7.0-Beta
    • KTIJ-20567 Kotlin/JS: Gradle import into IDEA creates no proper sub-modules, source sets, facets
    IDE. Hints. Inlay
    • KTIJ-20552 Support definitely non-null types in inlay hints
    IDE. Inspections and Intentions
    New Features
    • KTIJ-18979 Quickfix for INTEGER_OPERATOR_RESOLVE_WILL_CHANGE to add explicit conversion call
    • KTIJ-19950 Provide quickfixes for INVALID_IF_AS_EXPRESSION_WARNING and NO_ELSE_IN_WHEN_WARNING
    • KTIJ-19866 Create quick-fix for effective visibility error on private-in-file interface exposing private class
    • KTIJ-19939 Provide quickfix for deprecated confusing expressions in when branches
    Fixes
    • KTIJ-20705 Register quickfix for NO_CONSTRUCTOR_WARNING diagnostic
    • KTIJ-21226 "Remove else branch" quick fix is not suggested
    • KTIJ-20981 Definitely non-null types: quick-fixes suggested incorrectly for LV=1.6 when Xenhance-type-parameter-types-to-def-not-null flag is set
    • KTIJ-20953 Add quickfix for OVERRIDE_DEPRECATION warning to 1.7 - 1.9 migration
    • KTIJ-20734 Replace with [@​JvmInline] value quick fix should be appliable on a whole project
    • KTIJ-21420 Add 'else' branch quick fix suggestion is displayed twice in case 'if' isn't completed
    • KTIJ-21192 "Make protected" intention is redundant for interface properties
    • KTIJ-18120 "Make public" intention does not add explicit "public" modifier when using ExplicitApi Strict mode
    • KTIJ-20493 "Create expect" quick fix doesn't warn about platform-specific annotations
    IDE. Misc
    IDE. Multiplatform
    • KT-49523 Improve environment setup experience for KMM projects
    • KT-50952 MPP: Commonized cinterops doesn't attach/detach to source set on configuration changes
    IDE. Native
    • KT-44329 Improve UX of using Native libraries in Kotlin
    • KTIJ-21602 With Native Debugging Support plugin Gradle run configurations can't be executed from IDEA: LLDB_NATVIS_RENDERERS_ENABLED
    IDE. Wizards
    • KTIJ-20919 Update ktor-html-builder dependency in kotlin wizards
    • KTIJ-20962 Wizard: Invalid Ktor imports
    JavaScript
    New Features
    • KT-51735 KJS / IR: Minimize member names in production mode
    Performance Improvements
    • KT-51127 Kotlin/JS - IR generates plenty of useless Unit_getInstance()
    • KT-50212 KJS IR: Upcast should be a no-op
    • KT-16974 JS: Kotlin.charArrayOf is suboptimal due to Rhino bugs
    Fixes
    • KT-44319 JS IR BE: Add an ability to generate separate JS files for each module
    • KT-52518 Kotlin/JS IR: project with 1.6.21 fails to consume library built with 1.7.0-RC: ISE "Unexpected IrType kind: KIND_NOT_SET" at IrDeclarationDeserializer.deserializeIrTypeData()
    • KT-52010 K/JS IR: both flows execute when using elvis operator
    • KT-41096 KJS IR: @​JsExport should use original js name for external declarations
    • KT-52144 KJS / IR: Missing property definitions for interfaced defined properties
    • KT-52252 KJS / IR: overridden properties are undefined/null
    • KT-51973 KJS / IR overridden properties of inherited interface missing
    • KT-51125 Provide a way to use import keyword in js expressions
    • KT-40888 KJS / IR: Missing methods are no longer generated (polyfills)
    • KT-50504 KJS / IR: Transpiled JS incorrectly uses the unscrambled names of internal fields
    • KT-51853 JS compilation fails with "Uninitialized fast cache info" error
    • KT-51205 K/JS IR: external class is mapped to any
    • KT-50806 Typescript definitions contain invalid nested block comments with generic parent and type argument without @JsExport
    • KT-51841 KJS / IR: No flat hash for FUN FAKE_OVERRIDE with kotlin.incremental.js.ir=true
    • KT-51081 KJS / IR + IC: Passing an inline function with default params as a param to a higher-order function crashes the compiler
    • KT-51084 KJS / IR + IC: Cache invalidation doesn't check generic inline functions reified qualifier
    • KT-51211 K/JS IR: JsExport: Can't export nested enum
    • KT-51438 KJS / IR: Duplicated import names for the same external names
    • KT-51238 Kotlin/JS: IR + IC: build fails after clean on compileTestDevelopmentExecutableKotlinJs task: "Failed to create MD5 hash for file '.../build/classes/kotlin/main' as it does not exist"
    • KT-50674 KJS / IR: JS code cannot modify local variable
    • KT-50953 KJS IR: Incorrect nested commenting in d.ts
    • KT-15223 JS: function that overrides external function with vararg parameter is translated incorrectly
    • KT-50657 KJS / IR 1.6.20-M1-39 - Date in Kotlin JS cannot be created from long.
    Language Design
    New Features
    • KT-45618 Stabilize builder inference
    • KT-30485 Underscore operator for type arguments
    • KT-49006 Support at least three previous versions of language/API
    • KT-16768 Context-sensitive resolution prototype (Resolve unqualified enum constants based on expected type)
    • KT-14663 Support having a "public" and a "private" type for the same property
    • KT-50477 Functional conversion does not work on suspending functions
    • KT-32162 Allow generics for inline classes
    Fixes
    • KT-12380 Support sealed (exhaustive) whens
    • KT-27750 Reverse reservation of 'yield' as keyword
    • KT-22956 Release OptIn annotations
    • KT-44866 Change behavior of private constructors of sealed classes
    • KT-49110 Prohibit access to members of companion of enum class from initializers of entries of this enum
    • KT-29405 Switch default JVM target version to 1.8
    Libraries
    New Features
    • KT-50484 Extensions for java.util.Optional in stdlib
    • KT-50146 Reintroduce min/max(By/With) operations on collections with non-nullable return type
    • KT-46132 Specialized default time source with non-allocating time marks
    • KT-41890 Support named capture groups in Regex on Native
    • KT-48179 Introduce API to retrieve the number of CPUs the runtime has
    Performance Improvements
    • KT-42178 Range and Progression should override last()
    Fixes
    • KT-42436 Support java.nio.Path extension in the standard library
    • KT-51470 Stabilize experimental API for 1.7
    • KT-51775 JS: Support named capture groups in Regex
    • KT-51776 Native: Support back references to groups with multi-digit index
    • KT-51082 Introduce Enum.declaringJavaClass property
    • KT-51848 Promote deepRecursiveFunction to stable API
    • KT-48924 KJS: toString in base 36 produces different results in JS compare to JVM
    • KT-50742 Regular expression is fine on jvm but throws PatternSyntaxException for native macosX64 target
    • KT-50059 Stop publishing kotlin-stdlib and kotlin-test artifacts under modular classifier
    • KT-26678 Rename buildSequence/buildIterator to sequence/iterator
    Native
    • KT-49406 Kotlin/Native: generate standalone executable for androidNative targets by default
    • KT-48595 Enable Native embeddable compiler jar in Gradle plugin by default
    • KT-51377 Native: synthetic forward declarations are preferred over commonized definitions
    • KT-49145 Kotlin/Native static library compilation fails for androidNative*
    • KT-49496 Gradle (or the KMM plugin) is caching the Xcode Command Line Tools location
    • KT-49247 gradle --offline should translate into airplaneMode for kotin-native compiler
    Native. Build Infrastructure
    • KT-52259 kotlin-native releases from GitHub don't contain platform libs
    Native. C and ObjC Import
    • KT-49455 Methods from Swift extensions are not resolved in Kotlin shared module
    • KT-50648 Incorrect KMM cinterop conversion
    Native. ObjC Export
    • KT-50982 RuntimeAssertFailedPanic in iOS when Kotlin framework is initialized before loading
    • KT-49937 Kotlin/Native 1.5.31: 'runtime assert: Unexpected selector clash' when 'override fun toString(): String' is used
    Native. Platforms
    • KT-52232 Kotlin/Native: simplify toolchain dependency override for MinGW
    Native. Runtime
    • KT-52365 Kotlin/Native fails to compile projects for 32-bit targets when new memory manager is enabled
    Native. Runtime. Memory
    • KT-48537 Kotlin/Native: improve GC triggers in the new MM.
    • KT-50713 Kotlin/Native: Enable Concurrent Sweep GC by default
    Native. Stdlib
    • KT-50312 enhancement: kotlin native -- add alloc<TVarOf>(T)
    Native. Testing
    • KT-50316 Kotlin/Native: Produce a list of available tests alongside the final artifact
    • KT-50139 Create tests for Enter/Leave frame optimization
    Reflection
    • KT-27598 "KotlinReflectionInternalError" when using callBy on constructor that has inline class parameters
    • KT-31141 IllegalArgumentException when reflectively accessing nullable property of inline class type
    Tools. CLI
    • KT-52409 Report error when use-k2 with Multiplatform
    • KT-51717 IllegalArgumentException: Unexpected versionNeededToExtract (0) in 1.6.20-RC2 with useFir enabled
    • KT-52217 Rename 'useFir' to 'useK2'
    • KT-29974 Add a compiler option '-Xjdk-release' similar to javac's '--release' to control the target JDK version
    • KT-51673 Make language version description not in capital letters
    • KT-48833 -Xsuppress-version-warnings allows to suppress errors about unsupported versions
    • KT-51627 kotlinc fails with java.lang.RuntimeException if /tmp/build.txt file exists on the disk
    • KT-51306 Support reading language settings from an environment variable and overriding the current settings by them
    • KT-51093 "-Xopt-in=..." command line argument no longer works
    Tools. Commonizer
    • KT-43309 Overwrite return type and parameter types of callable member to succeed commonization
    • KT-52050 [Commonizer] 'platform.posix.DIR' not implementing 'CPointed' when commonized for 'nativeMain' on linux or windows hosts
    • KT-51224 MPP: For optimistically commonized numbers missed kotlinx.cinterop.UnsafeNumber
    • KT-51215 MPP: Update Kdoc description for kotlinx.cinterop.UnsafeNumber
    • KT-51686 Cinterop: Overload resolution ambiguity in 1.6.20-RC2
    • KT-46636 HMPP: missed classes from platform.posix.*
    • KT-51332 Optimistic number commonization is disabled by default in KGP with enabled HMPP
    Tools. Compiler Plugins
    • KT-50992 jvm-abi-gen breaks inline functions in inline classes with private constructors in Kotlin 1.6.20
    Tools. Daemon
    • KT-32885 KT. Kotlin daemon compilation process is broken: java.lang.IllegalStateException Service is dying at entities generation by Kotlin.kts script
    Tools. Gradle
    New Features
    • KT-49227 Support Gradle plugins variants
    • KT-50869 Provide API that allow AGP to set up Kotlin compilation
    • KT-48008 Consider offering a KotlinBasePlugin
    • KT-52030 Provide experimental possibility to view internal information about Kotlin Compiler performance
    Performance Improvements
    • KT-52141 Optimize Java class snapshotting for the kotlin.incremental.useClasspathSnapshot feature
    • KT-51978 Optimize classpath snapshot cache for the kotlin.incremental.useClasspathSnapshot feature
    • KT-51326 Kotlin-gradle-plugin performance issue with mass java SourceRoots
    Fixes
    • KT-52448 Compilation tasks are missing input/output/internal annotations on includes/excludes properties
    • KT-52239 Type based task configuration-blocks for JVM stopped working in Gradle
    • KT-52313 No recompilation in Gradle after adding or removing function parameters, removing functions (and maybe more) in dependent modules
    • KT-51854 Add Ktor to gradle performance benchmark
    • KT-52086 Rename flag 'use-fir' to 'use-k2'
    • KT-52509 Main variant published to Gradle plugin portal uses unshadowed artifact
    • KT-52392 Gradle: 1.7.0 does not support custom gradle build configuration on Windows OS
    • KT-32805 KotlinCompile inherits properties sourceCompatibility and targetCompatibility which breaks Gradle's incremental compilation
    • KT-52189 Provide Gradle Kotlin/DSL friendly deprecated classpath property in KotlinCompiler task
    • KT-51415 Confusing build failure reason is displayed in case kapt is used and different JDKs are used for compileKotlin and compileJava tasks
    • KT-52187 New IC can not be enabled in an Android project using kapt
    • KT-51898 Upgrading Kotlin/Kotlin Gradle plugin to 1.5.3 and above breaks 'com.android.asset-pack' plugin
    • KT-51913 Gradle plugin should not add attributes to the legacy configurations
    • KT-34862 Restoring from build cache breaks Kotlin incremental compilation
    • KT-45777 New IC in Gradle
    • KT-51360 Show performance difference in percent between releases
    • KT-51380 Add open-source project using Kotlin/JS plugin to build regression benchmarks
    • KT-51937 Toolchain usage with configuration cache prevents KotlinCompile task to be UP-TO-DATE
    • KT-48276 Remove kotlin2js and kotlin-dce-plugin
    • KT-52138 KSP could not access internal methods/properties in Kotlin Gradle Plugin
    • KT-51342 Set minimal supported Android Gradle plugin version to 3.6.4
    • KT-50494 Remove kotlin.experimental.coroutines Gradle DSL option
    • KT-49733 Bump minimal supported Gradle version to 6.7.1
    • KT-48831 Remove 'KotlinGradleSubplugin'
    • KT-47924 Remove annoying cast in toolchain extension method for Kotlin DSL
    • KT-46541 Fail Gradle builds when deprecated kotlinOptions.jdkHome is set
    • KT-51830 Gradle: deprecate kotlin.compiler.execution.strategy system property
    • KT-47763 Gradle DSL: Remove deprecated useExperimentalAnnotation and experimentalAnnotationInUse
    • KT-51374 NoSuchFileException in getOrCreateSessionFlagFile()
    • KT-51837 kotlin-gradle-plugin:1.6.20 fails xray scan on shadowed Gson 2.8.6.
    • KT-51454 KotlinJvmTest is not a cacheable task
    • KT-45745 Migrate only Kotlin Gradle Plugin tests to new JUnit5 DSL and run them separately on CI
    • KT-47318 Remove deprecated 'kotlinPluginVersion' property in `KotlinBasePluginWrapper'
    • KT-51378 Gradle 'buildSrc' compilation fails when newer version of Kotlin plugin is added to the build script classpath
    • KT-46038 Gradle: kotlin_module files are corrupted in the KotlinCompile output, and gets cached
    • KT-51064 Kotlin gradle build hangs on MetricsContainer.flush
    • KT-48779 Gradle: Could not connect to kotlin daemon
    Tools. Gradle. Cocoapods
    • KT-50622 Cocoapods Plugin: cocoapods-generate does not work correctly with ruby 3.0.0 and higher
    • KT-51861 Custom binary name in CocoaPods plugin isn't respected by fatFramework task
    Tools. Gradle. JS
    • KT-52221 Kotlin/JS: failed Node tests are not reported in a standard way
    • KT-51895 K/JS: Redundant technical messages during JS tests
    • KT-51414 Allow set up environment variables for JS tests
    • KT-51623 Kotlin/JS: Mocha could not failed when external module not found
    • KT-51503 Update NPM dependency versions
    Tools. Gradle. Multiplatform
    New Features
    • KT-51386 [KPM] IdeaKotlinProjectModelBuilder: Implement dependencies
    Fixes
    • KT-49524 Improve DSL for managing Kotlin/Native binary output
    • KT-51765 com.android.lint in multiplatform project without android target should not trigger warning
    • KT-38456 MPP with Android source set: allTests task does not execute Android unit tests
    • KT-44227 Common tests are not launched on local JVM for Android via allTests task in a multiplatform project
    • KT-51946 Temporarily mark HMPP tasks as notCompatibleWithConfigurationCache for Gradle 7.4
    • KT-52140 Support extensibility Kotlin Artifacts DSL by external gradle plugins
    • KT-51947 Mark HMPP tasks as notCompatibleWithConfigurationCache for Gradle 7.4 using Reflection
    • KT-50925 Could not resolve all files for configuration ':metadataCompileClasspath'
    • KT-51262 [KPM] IDEA import: Move model builder to KGP
    • KT-51220 [KPM][Android] Implement generic data storage and import pipeline
    • KT-48649 No run task generated for macosArm64 target in Gradle plugin
    Tools. Gradle. Native
    • KT-47746 Allow customization of the Kotlin/Native compiler download url
    • KT-51884 Gradle Native: "A problem occurred starting process 'command 'xcodebuild''" when building assembleFooXCFramework task on Linux
    Tools. Incremental Compile
    • KT-51546 FIR incremental compilation fails with assertion "Trying to inline an anonymous object which is not part of the public ABI"
    • KT-49780 IncrementalCompilerRunner bug: Outputs are deleted after successful rebuild following fallback from an exception
    • KT-44741 Incremental compilation: inspectClassesForKotlinIC doesn't determine changes with imported constant
    Tools. JPS
    • KTIJ-17280 JPS: don't use java.io.File.createTempFile as it is not working sometimes
    • KTIJ-20954 NPE at at org.jetbrains.kotlin.metadata.jvm.deserialization.JvmProtoBufUtil.readNameResolver on compiling by JPS with LV > 1.7
    Tools. Kapt
    • KT-49533 Make kapt work out of the box with latest JDKs
    • KT-52284 FIR: add error in 1.7.0 branch if run with Kapt
    • KT-51463 KAPT: Incremental compilation not working when rerunning unit tests
    • KT-51132 KAPT: Support reporting the number of generated files by each annotation processor
    • KT-30172 Kapt: Shutdown kotlinc gracefully in case of error in annotation processor
    Tools. Scripts
    • KT-49173 Add support for nullable types in provided properties and other configuration-defined declarations
    • KT-52294 [Scripting] Update oudated org.eclipse.aether dependencies to new org.apache.maven.resolver
    • KT-51213 Kotlin JSR223 crashes with "ScriptException: ERROR java.lang.NullPointerException:" if bindings contain one or more null values
    • KT-48812 Script: "IllegalStateException: unknown classifier kind SCRIPT" when passing a funct

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