Implement fake vars generation for functions inlined with IR inliner

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/JvmLower.kt

@@ -407,6 +407,7 @@ private val jvmFilePhases = listOf(
 
     renameFieldsPhase,
     fakeInliningLocalVariablesLowering,
+    fakeInliningLocalVariablesAfterInlineLowering,
 
     // makePatchParentsPhase()
 )

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/FakeInliningLocalVariablesAfterInlineLowering.kt

@@ -0,0 +1,118 @@
+/*
+ * Copyright 2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.backend.jvm.lower
+
+import org.jetbrains.kotlin.backend.common.FileLoweringPass
+import org.jetbrains.kotlin.backend.common.ir.*
+import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
+import org.jetbrains.kotlin.backend.common.phaser.makeIrFilePhase
+import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
+import org.jetbrains.kotlin.backend.jvm.ir.isInlineOnly
+import org.jetbrains.kotlin.codegen.inline.INLINE_FUN_VAR_SUFFIX
+import org.jetbrains.kotlin.codegen.inline.coroutines.FOR_INLINE_SUFFIX
+import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.builders.createTmpVariable
+import org.jetbrains.kotlin.ir.builders.irInt
+import org.jetbrains.kotlin.ir.declarations.*
+import org.jetbrains.kotlin.ir.expressions.IrBlock
+import org.jetbrains.kotlin.ir.expressions.IrInlinedFunctionBlock
+import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
+import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
+import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
+import org.jetbrains.kotlin.ir.visitors.acceptVoid
+import org.jetbrains.kotlin.load.java.JvmAbi
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.name.SpecialNames
+
+internal val fakeInliningLocalVariablesAfterInlineLowering = makeIrFilePhase(
+    ::FakeInliningLocalVariablesAfterInlineLowering,
+    name = "FakeInliningLocalVariablesAfterInlineLowering",
+    description = """Add fake locals to identify the range of inlined functions and lambdas. 
+        |This lowering adds fake locals into already inlined blocks.""".trimMargin()
+)
+
+// TODO extract common code with FakeInliningLocalVariablesLowering
+internal class FakeInliningLocalVariablesAfterInlineLowering(val context: JvmBackendContext) : IrElementVisitor<Unit, IrDeclaration?>, FileLoweringPass {
+    private val inlinedStack = mutableListOf<IrInlinedFunctionBlock>()
+
+    override fun lower(irFile: IrFile) {
+        irFile.accept(this, null)
+    }
+
+    override fun visitElement(element: IrElement, data: IrDeclaration?) {
+        val newData = if (element is IrDeclaration && element !is IrVariable) element else data
+        element.acceptChildren(this, newData)
+    }
+
+    override fun visitBlock(expression: IrBlock, data: IrDeclaration?) {
+        when {
+            expression is IrInlinedFunctionBlock && expression.isFunctionInlining() -> handleInlineFunction(expression, data)
+            expression is IrInlinedFunctionBlock && expression.isLambdaInlining() -> handleInlineLambda(expression, data)
+            else -> super.visitBlock(expression, data)
+        }
+    }
+
+    private fun handleInlineFunction(expression: IrInlinedFunctionBlock, data: IrDeclaration?) {
+        val declaration = expression.inlineDeclaration
+
+        inlinedStack += expression
+        super.visitBlock(expression, data)
+        inlinedStack.removeLast()
+
+        if (declaration is IrFunction && declaration.isInline && !declaration.origin.isSynthetic && declaration.body != null && !declaration.isInlineOnly()) {
+            val currentFunctionName = context.defaultMethodSignatureMapper.mapFunctionName(declaration)
+            val localName = "${JvmAbi.LOCAL_VARIABLE_NAME_PREFIX_INLINE_FUNCTION}$currentFunctionName"
+            //declaration.addFakeLocalVariable(localName)
+            with(context.createIrBuilder(data!!.symbol)) {
+                val tmpVar =
+                    scope.createTmpVariable(irInt(0), localName.removeSuffix(FOR_INLINE_SUFFIX), origin = IrDeclarationOrigin.DEFINED)
+                // TODO maybe add in front of inline block
+                expression.putStatementsInFrontOfInlinedFunction(listOf(tmpVar))
+            }
+        }
+
+        expression.processLocalDeclarations()
+    }
+
+    @Suppress("UNUSED_PARAMETER")
+    private fun handleInlineLambda(expression: IrInlinedFunctionBlock, data: IrDeclaration?) {
+        // TODO
+    }
+
+    private fun IrInlinedFunctionBlock.processLocalDeclarations() {
+        this.getAdditionalStatementsFromInlinedBlock().forEach {
+            if (it is IrVariable && it.origin == IrDeclarationOrigin.IR_TEMPORARY_VARIABLE) {
+                val varName = it.name.asString().substringAfterLast("_")
+                it.name = Name.identifier((if (varName == SpecialNames.THIS.asString()) "this_" else varName) + INLINE_FUN_VAR_SUFFIX)
+                it.origin = IrDeclarationOrigin.DEFINED
+            }
+        }
+
+        this.getOriginalStatementsFromInlinedBlock().forEach {
+            it.acceptVoid(object : IrElementVisitorVoid {
+                override fun visitElement(element: IrElement) {
+                    element.acceptChildrenVoid(this)
+                }
+
+                override fun visitVariable(declaration: IrVariable) {
+                    val varName = declaration.name.asString()
+                    declaration.name = when {
+                        varName == SpecialNames.THIS.asString() -> {
+                            Name.identifier("this_$INLINE_FUN_VAR_SUFFIX")
+                        }
+
+                        !varName.startsWith(JvmAbi.LOCAL_VARIABLE_NAME_PREFIX_INLINE_FUNCTION) -> {
+                            Name.identifier(varName + INLINE_FUN_VAR_SUFFIX)
+                        }
+
+                        else -> declaration.name
+                    }
+                    super.visitVariable(declaration)
+                }
+            })
+        }
+    }
+}