Exclude non-inline method bodies from ABI classes

plugins/jvm-abi-gen/src/org/jetbrains/kotlin/jvm/abi/asm/AbiClassBuilder.kt

@@ -7,11 +7,9 @@ package org.jetbrains.kotlin.jvm.abi.asm
 
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.codegen.AbstractClassBuilder
+import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.resolve.jvm.diagnostics.JvmDeclarationOrigin
-import org.jetbrains.org.objectweb.asm.ClassVisitor
+import org.jetbrains.org.objectweb.asm.*
-import org.jetbrains.org.objectweb.asm.FieldVisitor
-import org.jetbrains.org.objectweb.asm.MethodVisitor
-import org.jetbrains.org.objectweb.asm.Opcodes
 
 internal class AbiClassBuilder(private val cv: ClassVisitor) : AbstractClassBuilder() {
     override fun getVisitor(): ClassVisitor = cv
@@ -26,7 +24,13 @@ internal class AbiClassBuilder(private val cv: ClassVisitor) : AbstractClassBuil
     ): MethodVisitor {
         if (isPrivate(access)) return EMPTY_METHOD_VISITOR
 
-        return super.newMethod(origin, access, name, desc, signature, exceptions)
+        val mv = super.newMethod(origin, access, name, desc, signature, exceptions)
+        val descriptor = origin.descriptor
+        if (descriptor is FunctionDescriptor && descriptor.isInline) return mv
+
+        // getArgumentsAndReturnSizes returns `(argSize << 2) | retSize`, where argSize includes `this`
+        val maxLocals = (Type.getArgumentsAndReturnSizes(desc) shr 2) - 1
+        return ReplaceWithEmptyMethodVisitor(maxLocals, mv, Opcodes.ASM6)
     }
 
     override fun newField(

plugins/jvm-abi-gen/src/org/jetbrains/kotlin/jvm/abi/asm/ReplaceWithEmptyMethodVisitor.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.jvm.abi.asm
+
+import org.jetbrains.org.objectweb.asm.*
+
+internal class ReplaceWithEmptyMethodVisitor(
+    private val newMaxLocals: Int,
+    private val delegate: MethodVisitor,
+    api: Int
+) : MethodVisitor(api, null) {
+    override fun visitCode() {
+        delegate.visitCode()
+        delegate.visitMaxs(0, newMaxLocals)
+        delegate.visitEnd()
+    }
+
+    override fun visitParameter(name: String?, access: Int) {
+        delegate.visitParameter(name, access)
+    }
+
+    override fun visitParameterAnnotation(parameter: Int, desc: String?, visible: Boolean): AnnotationVisitor =
+        delegate.visitParameterAnnotation(parameter, desc, visible)
+
+    override fun visitAnnotationDefault(): AnnotationVisitor =
+        delegate.visitAnnotationDefault()
+
+    override fun visitAnnotation(desc: String?, visible: Boolean): AnnotationVisitor =
+        delegate.visitAnnotation(desc, visible)
+
+    override fun visitTypeAnnotation(typeRef: Int, typePath: TypePath?, desc: String?, visible: Boolean): AnnotationVisitor =
+        delegate.visitTypeAnnotation(typeRef, typePath, desc, visible)
+
+    override fun visitAttribute(attr: Attribute?) {
+        delegate.visitAttribute(attr)
+    }
+}

plugins/jvm-abi-gen/test/org/jetbrains/kotlin/jvm/abi/CompareJvmAbiTestGenerated.java

@@ -34,6 +34,16 @@ public class CompareJvmAbiTestGenerated extends AbstractCompareJvmAbiTest {
         runTest("plugins/jvm-abi-gen/testData/compare/classPrivateMemebers/");
     }
 
+    @TestMetadata("functionBody")
+    public void testFunctionBody() throws Exception {
+        runTest("plugins/jvm-abi-gen/testData/compare/functionBody/");
+    }
+
+    @TestMetadata("inlineFunctionBody")
+    public void testInlineFunctionBody() throws Exception {
+        runTest("plugins/jvm-abi-gen/testData/compare/inlineFunctionBody/");
+    }
+
     @TestMetadata("topLevelPrivateMembers")
     public void testTopLevelPrivateMembers() throws Exception {
         runTest("plugins/jvm-abi-gen/testData/compare/topLevelPrivateMembers/");

plugins/jvm-abi-gen/testData/compare/functionBody/base/function.kt

@@ -0,0 +1,3 @@
+package test
+
+fun sum(x: Int, y: Int): Int = x + y

plugins/jvm-abi-gen/testData/compare/functionBody/sameAbi/function.kt

@@ -0,0 +1,3 @@
+package test
+
+fun sum(x: Int, y: Int): Int = y + x

plugins/jvm-abi-gen/testData/compare/inlineFunctionBody/base/function.kt

@@ -0,0 +1,3 @@
+package test
+
+inline fun sum(x: Int, y: Int): Int = x + y

plugins/jvm-abi-gen/testData/compare/inlineFunctionBody/differentAbi/function.kt

@@ -0,0 +1,3 @@
+package test
+
+inline fun sum(x: Int, y: Int): Int = y + x