From 10a1ea9091a91d85bc27dc32fa0a78e387170574 Mon Sep 17 00:00:00 2001
From: Alexander Udalov <alexander.udalov@jetbrains.com>
Date: Fri, 13 Nov 2020 11:19:11 +0100
Subject: [PATCH] Add kotlin.build.useIR property to compile project with JVM
 IR

The change in Devirtualization.kt is needed to workaround JVM IR issue
reported at KT-43286.

(cherry picked from commit 4a945686bae98c147a641c0b41d3e8474f133ca2)
---
 .../backend/konan/optimizations/Devirtualization.kt      | 2 +-
 kotlin-native/build.gradle                               | 9 +++++++++
 kotlin-native/gradle.properties                          | 3 +++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/Devirtualization.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/Devirtualization.kt
index 3f67829cdf2..36f42b5e1eb 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/Devirtualization.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/Devirtualization.kt
@@ -820,7 +820,7 @@ internal object Devirtualization {
                 val value = fromId.toLong() or (toId.toLong() shl 32)
                 // This is 64-bit extension of a hashing method from Knuth's "The Art of Computer Programming".
                 // The magic constant is the closest prime to 2^64 * phi, where phi is the golden ratio.
-                val bucketIdx = ((value.toULong() * 11400714819323198393UL) % bagOfEdges.size.toUInt()).toInt()
+                val bucketIdx = ((value.toULong() * 11400714819323198393UL) % bagOfEdges.size.toULong()).toInt()
                 val bucket = bagOfEdges[bucketIdx] ?: LongArrayList().also { bagOfEdges[bucketIdx] = it }
                 for (x in bucket)
                     if (x == value) return
diff --git a/kotlin-native/build.gradle b/kotlin-native/build.gradle
index 281800d9324..8cf97669123 100644
--- a/kotlin-native/build.gradle
+++ b/kotlin-native/build.gradle
@@ -131,6 +131,15 @@ allprojects {
         }
     }
 
+    if (findProperty("kotlin.build.useIR") == "true") {
+        tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach {
+            kotlinOptions {
+                useIR = true
+                freeCompilerArgs += ["-Xir-binary-with-stable-abi"]
+            }
+        }
+    }
+
     setupHostAndTarget()
     loadCommandLineProperties()
     loadLocalProperties()
diff --git a/kotlin-native/gradle.properties b/kotlin-native/gradle.properties
index deb6f429ee0..39e067f0e08 100644
--- a/kotlin-native/gradle.properties
+++ b/kotlin-native/gradle.properties
@@ -42,5 +42,8 @@ ktorVersion=1.2.1
 shadowVersion=5.1.0
 metadataVersion=0.0.1-dev-10
 
+# Uncomment to compile Kotlin/Native backend modules with JVM IR backend.
+# kotlin.build.useIR=true
+
 # Uncomment to enable composite build
 #kotlinProjectPath=<insert the path to Kotlin project root here>