JVM IR: extract separate module backend.jvm.codegen

The main benefit is that now lowerings and codegen are compiled in
parallel, which speeds up the build. Hopefully, this will also improve
incremental compilation in case of implementation changes because the
rest of the compiler (cli & tests) has no "api" dependency on lowerings
and codegen.

build.gradle.kts

@@ -242,6 +242,7 @@ val fe10CompilerModules = arrayOf(
     ":compiler:ir.psi2ir",
     ":compiler:backend.jvm",
     ":compiler:backend.jvm.lower",
+    ":compiler:backend.jvm.codegen",
     ":compiler:backend.jvm.entrypoint",
     ":compiler:backend.js",
     ":compiler:backend.wasm",

compiler/ir/backend.jvm/build.gradle.kts

@@ -4,13 +4,12 @@ plugins {
 }
 
 dependencies {
-    api(project(":kotlin-annotations-jvm"))
     api(project(":compiler:backend"))
     api(project(":compiler:ir.tree"))
     api(project(":compiler:ir.backend.common"))
     api(project(":compiler:backend.common.jvm"))
     compileOnly(project(":compiler:ir.tree.impl"))
-    compileOnly(intellijCoreDep()) { includeJars("intellij-core", "asm-all", "guava", rootProject = rootProject) }
+    compileOnly(intellijCoreDep()) { includeJars("intellij-core", "asm-all", rootProject = rootProject) }
 }
 
 sourceSets {

compiler/ir/backend.jvm/codegen/build.gradle.kts

@@ -0,0 +1,19 @@
+plugins {
+    kotlin("jvm")
+    id("jps-compatible")
+}
+
+dependencies {
+    api(project(":compiler:ir.tree"))
+    api(project(":compiler:ir.backend.common"))
+    api(project(":compiler:backend.jvm"))
+    implementation(project(":compiler:ir.tree.impl"))
+    compileOnly(intellijCoreDep()) { includeJars("intellij-core", rootProject = rootProject) }
+}
+
+sourceSets {
+    "main" {
+        projectDefault()
+    }
+    "test" {}
+}

compiler/ir/backend.jvm/entrypoint/build.gradle.kts

@@ -9,6 +9,7 @@ dependencies {
     api(project(":compiler:ir.tree.impl"))
     api(project(":compiler:ir.serialization.jvm"))
     implementation(project(":compiler:backend.jvm.lower"))
+    implementation(project(":compiler:backend.jvm.codegen"))
     compileOnly(intellijCoreDep()) { includeJars("intellij-core", rootProject = rootProject) }
 }
 

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/ir/IrJvmFlexibleType.kt

@@ -67,7 +67,7 @@ private class IrJvmFlexibleTypeImpl(
         }
 }
 
-internal fun IrType.isWithFlexibleNullability(): Boolean =
+fun IrType.isWithFlexibleNullability(): Boolean =
     hasAnnotation(JvmSymbols.FLEXIBLE_NULLABILITY_ANNOTATION_FQ_NAME)
 
 internal fun IrType.isWithFlexibleMutability(): Boolean =

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/mapping/MethodSignatureMapper.kt

@@ -385,7 +385,7 @@ class MethodSignatureMapper(private val context: JvmBackendContext) {
         }
 
     // TODO get rid of 'caller' argument
-    internal fun mapToCallableMethod(expression: IrCall, caller: IrFunction?): IrCallableMethod {
+    fun mapToCallableMethod(expression: IrCall, caller: IrFunction?): IrCallableMethod {
         val callee = expression.symbol.owner
         val calleeParent = expression.superQualifierSymbol?.owner
             ?: expression.dispatchReceiver?.type?.classOrNull?.owner?.let {

settings.gradle

@@ -140,6 +140,7 @@ include ":benchmarks",
         ":compiler:backend.wasm",
         ":compiler:backend.jvm",
         ":compiler:backend.jvm.lower",
+        ":compiler:backend.jvm.codegen",
         ":compiler:backend.jvm.entrypoint",
         ":compiler:backend-common",
         ":compiler:backend",
@@ -588,6 +589,7 @@ project(':compiler:backend.js').projectDir = "$rootDir/compiler/ir/backend.js" a
 project(':compiler:backend.wasm').projectDir = "$rootDir/compiler/ir/backend.wasm" as File
 project(':compiler:backend.jvm').projectDir = "$rootDir/compiler/ir/backend.jvm" as File
 project(':compiler:backend.jvm.lower').projectDir = "$rootDir/compiler/ir/backend.jvm/lower" as File
+project(':compiler:backend.jvm.codegen').projectDir = "$rootDir/compiler/ir/backend.jvm/codegen" as File
 project(':compiler:backend.jvm.entrypoint').projectDir = "$rootDir/compiler/ir/backend.jvm/entrypoint" as File
 project(':compiler:ir.serialization.common').projectDir = "$rootDir/compiler/ir/serialization.common" as File
 project(':compiler:ir.serialization.jvm').projectDir = "$rootDir/compiler/ir/serialization.jvm" as File