From e333716fbe4cfa1735a7063f7de55d658cac9205 Mon Sep 17 00:00:00 2001
From: Ilmir Usmanov <ilmir.usmanov@jetbrains.com>
Date: Tue, 22 Aug 2023 11:57:11 +0200
Subject: [PATCH] JVM: Optimize isPrimitiveBoxing and isPrimitiveUnboxing

Precompute internal names and method descriptors instead of computing
on every access.
---
 .../optimization/boxing/BoxingInterpreter.kt   | 12 +++---------
 .../kotlin/resolve/jvm/JvmPrimitiveType.java   | 18 +++++++++++++-----
 2 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/boxing/BoxingInterpreter.kt b/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/boxing/BoxingInterpreter.kt
index c4eaac73577..1337ec5d438 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/boxing/BoxingInterpreter.kt
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/boxing/BoxingInterpreter.kt
@@ -246,11 +246,7 @@ private fun isWrapperClassNameOrNumber(internalClassName: String) =
     isWrapperClassName(internalClassName) || internalClassName == Type.getInternalName(Number::class.java)
 
 private fun isWrapperClassName(internalClassName: String) =
-    JvmPrimitiveType.isWrapperClassName(buildFqNameByInternal(internalClassName))
-
-
-private fun buildFqNameByInternal(internalClassName: String) =
-    FqName(Type.getObjectType(internalClassName).className)
+    JvmPrimitiveType.isWrapperClassInternalName(internalClassName)
 
 private fun isUnboxingMethodName(name: String) =
     UNBOXING_METHOD_NAMES.contains(name)
@@ -275,10 +271,8 @@ fun AbstractInsnNode.isCoroutinePrimitiveBoxing(): Boolean {
     }
 }
 
-private fun MethodInsnNode.isBoxingMethodDescriptor(): Boolean {
-    val ownerType = Type.getObjectType(owner)
-    return desc == Type.getMethodDescriptor(ownerType, AsmUtil.unboxType(ownerType))
-}
+private fun MethodInsnNode.isBoxingMethodDescriptor() =
+    JvmPrimitiveType.isBoxingMethodDescriptor(owner, desc)
 
 fun AbstractInsnNode.isJavaLangClassBoxing() =
     isMethodInsnWith(Opcodes.INVOKESTATIC) {
diff --git a/core/compiler.common.jvm/src/org/jetbrains/kotlin/resolve/jvm/JvmPrimitiveType.java b/core/compiler.common.jvm/src/org/jetbrains/kotlin/resolve/jvm/JvmPrimitiveType.java
index 49b388637b4..1d7b7ba0b0e 100644
--- a/core/compiler.common.jvm/src/org/jetbrains/kotlin/resolve/jvm/JvmPrimitiveType.java
+++ b/core/compiler.common.jvm/src/org/jetbrains/kotlin/resolve/jvm/JvmPrimitiveType.java
@@ -34,27 +34,35 @@ public enum JvmPrimitiveType {
     DOUBLE(PrimitiveType.DOUBLE, "double", "D", "java.lang.Double"),
     ;
 
-    private static final Set<FqName> WRAPPERS_CLASS_NAMES;
     private static final Map<String, JvmPrimitiveType> TYPE_BY_NAME;
     private static final Map<PrimitiveType, JvmPrimitiveType> TYPE_BY_PRIMITIVE_TYPE;
     private static final Map<String, JvmPrimitiveType> TYPE_BY_DESC;
+    private static final Set<String> WRAPPER_CLASS_INTERNAL_NAMES;
+    private static final Map<String, String> OWNER_TO_BOXING_METHOD_DESCRIPTOR;
 
     static {
-        WRAPPERS_CLASS_NAMES = new HashSet<FqName>();
         TYPE_BY_NAME = new HashMap<String, JvmPrimitiveType>();
         TYPE_BY_PRIMITIVE_TYPE = new EnumMap<PrimitiveType, JvmPrimitiveType>(PrimitiveType.class);
         TYPE_BY_DESC = new HashMap<String, JvmPrimitiveType>();
+        WRAPPER_CLASS_INTERNAL_NAMES = new HashSet<>();
+        OWNER_TO_BOXING_METHOD_DESCRIPTOR = new HashMap<>();
 
         for (JvmPrimitiveType type : values()) {
-            WRAPPERS_CLASS_NAMES.add(type.getWrapperFqName());
             TYPE_BY_NAME.put(type.getJavaKeywordName(), type);
             TYPE_BY_PRIMITIVE_TYPE.put(type.getPrimitiveType(), type);
             TYPE_BY_DESC.put(type.getDesc(), type);
+            String internalName = type.wrapperFqName.asString().replace('.', '/');
+            WRAPPER_CLASS_INTERNAL_NAMES.add(internalName);
+            OWNER_TO_BOXING_METHOD_DESCRIPTOR.put(internalName, "(" + type.desc + ")L" + internalName + ";");
         }
     }
 
-    public static boolean isWrapperClassName(@NotNull FqName className) {
-        return WRAPPERS_CLASS_NAMES.contains(className);
+    public static boolean isWrapperClassInternalName(@NotNull String internalName) {
+        return WRAPPER_CLASS_INTERNAL_NAMES.contains(internalName);
+    }
+
+    public static boolean isBoxingMethodDescriptor(@NotNull String owner, @NotNull String methodDescriptor) {
+        return methodDescriptor.equals(OWNER_TO_BOXING_METHOD_DESCRIPTOR.get(owner));
     }
 
     @NotNull