org.jetbrains.kotlin.codegen.optimization.boxing.BoxingAnalyzer.kt Maven / Gradle / Ivy

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/*
 * Copyright 2010-2021 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.codegen.optimization.boxing

import org.jetbrains.kotlin.codegen.optimization.common.FastMethodAnalyzer
import org.jetbrains.org.objectweb.asm.tree.MethodNode
import org.jetbrains.org.objectweb.asm.tree.analysis.AnalyzerException
import org.jetbrains.org.objectweb.asm.tree.analysis.BasicValue
import org.jetbrains.org.objectweb.asm.tree.analysis.Frame
import org.jetbrains.org.objectweb.asm.tree.analysis.Interpreter

class BoxingAnalyzer(
    owner: String,
    method: MethodNode,
    private val boxingInterpreter: BoxingInterpreter
) : FastMethodAnalyzer(owner, method, boxingInterpreter) {
    override fun newFrame(nLocals: Int, nStack: Int): Frame =
        BoxingFrame(nLocals, nStack)

    private inner class BoxingFrame(nLocals: Int, nStack: Int) : Frame(nLocals, nStack) {
        override fun merge(frame: Frame, interpreter: Interpreter): Boolean {
            if (stackSize != frame.stackSize) {
                throw AnalyzerException(null, "Incompatible stack heights")
            }

            var changed = false
            for (i in 0 until locals) {
                val local = getLocal(i)
                val merged = boxingInterpreter.mergeLocalVariableValues(local, frame.getLocal(i))
                if (local != merged) {
                    setLocal(i, merged)
                    changed = true
                }
            }
            for (i in 0 until stackSize) {
                val onStack = getStack(i)
                val merged = boxingInterpreter.mergeStackValues(onStack, frame.getStack(i))
                if (onStack != merged) {
                    setStack(i, merged)
                    changed = true
                }
            }
            return changed
        }
    }
}