com.jetbrains.pluginverifier.verifiers.CodeAnalysisUtil.kt Maven / Gradle / Ivy
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Core classes of JetBrains Plugin Verifier with verification rules, general usage detection and bytecode verification engine
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/*
* Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
*/
package com.jetbrains.pluginverifier.verifiers
import com.jetbrains.pluginverifier.verifiers.resolution.Field
import com.jetbrains.pluginverifier.verifiers.resolution.Method
import com.jetbrains.pluginverifier.verifiers.resolution.MethodAsm
import org.objectweb.asm.Opcodes
import org.objectweb.asm.tree.*
import org.objectweb.asm.tree.analysis.Analyzer
import org.objectweb.asm.tree.analysis.Frame
import org.objectweb.asm.tree.analysis.SourceInterpreter
import org.objectweb.asm.tree.analysis.SourceValue
import java.util.*
fun analyzeMethodFrames(method: Method): List>? =
if (method is MethodAsm) {
Analyzer(SourceInterpreter()).analyze(method.containingClassFile.name, method.asmNode).toList()
} else {
null
}
fun Frame.getOnStack(index: Int): SourceValue? =
getStack(stackSize - 1 - index)
class CodeAnalysis {
private val inVisitMethods: Deque = LinkedList()
private val inVisitFields: Deque = LinkedList()
fun evaluateConstantString(
analyzedMethod: Method,
instructionIndex: Int,
onStackIndex: Int
): String? {
val frames = analyzeMethodFrames(analyzedMethod) ?: return null
val frame = frames.getOrNull(instructionIndex) ?: return null
val sourceValue = frame.getOnStack(onStackIndex) ?: return null
return evaluateConstantString(analyzedMethod, frames, sourceValue)
}
fun evaluateConstantString(
analyzedMethod: Method,
frames: List>,
sourceValue: SourceValue?
): String? {
val sourceInstructions = sourceValue?.insns ?: return null
if (sourceInstructions.size == 1) {
val producer = sourceInstructions.first()
return evaluateInstructionConstantString(producer, analyzedMethod, frames)
}
return null
}
private fun evaluateInstructionConstantString(
instruction: AbstractInsnNode,
analyzedMethod: Method,
frames: List>
): String? {
when (instruction) {
is LdcInsnNode -> {
if (instruction.cst is String) {
return instruction.cst as String
}
}
is MethodInsnNode -> {
if (instruction.owner == "java/lang/StringBuilder" && instruction.name == "toString") {
val instructions = analyzedMethod.instructions
val toStringIndex = instructions.indexOf(instruction)
if (toStringIndex == -1) {
return null
}
val initIndex = instructions.take(toStringIndex).indexOfLast {
it is MethodInsnNode && it.name == "" && it.owner == "java/lang/StringBuilder"
}
if (initIndex == -1) {
return null
}
val stringBuildingInstructions = instructions.subList(initIndex + 1, toStringIndex)
return evaluateConcatenatedStringValue(frames, analyzedMethod, stringBuildingInstructions)
} else if (instruction.owner == analyzedMethod.containingClassFile.name) {
val selfMethod = analyzedMethod.containingClassFile.methods.find {
it.name == instruction.name && it.descriptor == instruction.desc
}
if (selfMethod != null) {
val cantBeOverridden = selfMethod.isStatic || selfMethod.isPrivate || selfMethod.isFinal
if (cantBeOverridden) {
return evaluateConstantFunctionValue(selfMethod)
}
}
}
}
is FieldInsnNode -> {
if (instruction.owner == analyzedMethod.containingClassFile.name) {
val fieldNode = analyzedMethod.containingClassFile.fields.find {
it.name == instruction.name && it.descriptor == instruction.desc
} ?: return null
return evaluateConstantFieldValue(fieldNode)
}
}
}
return null
}
fun evaluateConstantFunctionValue(method: Method): String? {
if (method.isAbstract || method.descriptor != "()Ljava/lang/String;") {
return null
}
if (inVisitMethods.any { it.name == method.name && it.descriptor == method.descriptor && it.containingClassFile.name == method.containingClassFile.name }) {
return null
}
inVisitMethods.addLast(method)
try {
val instructions = method.instructions.dropLastWhile { it is LabelNode || it is LineNumberNode }
if (instructions.isEmpty()) {
return null
}
val lastInstruction = instructions.last()
if (lastInstruction !is InsnNode || lastInstruction.opcode != Opcodes.ARETURN) {
return null
}
if (instructions.count { it is InsnNode && Opcodes.IRETURN <= it.opcode && it.opcode <= Opcodes.RETURN } > 1) {
return null
}
return evaluateConstantString(method, instructions.size - 1, 0)
} finally {
inVisitMethods.removeLast()
}
}
private fun evaluateConstantFieldValue(field: Field): String? {
if (!field.isStatic || !field.isFinal || field.descriptor != "Ljava/lang/String;") {
return null
}
if (field.initialValue is String) {
return field.initialValue as String
}
if (inVisitFields.any { it.name == field.name && it.descriptor == field.descriptor && it.containingClassFile.name == field.containingClassFile.name }) {
return null
}
inVisitFields.addLast(field)
try {
val classFile = field.containingClassFile
val classInitializer = classFile.methods.find { it.name == "" } ?: return null
val frames = analyzeMethodFrames(classInitializer) ?: return null
val instructions = classInitializer.instructions
val predicate: (AbstractInsnNode) -> Boolean = {
it is FieldInsnNode
&& it.opcode == Opcodes.PUTSTATIC
&& it.owner == classFile.name
&& it.name == field.name
&& it.desc == field.descriptor
}
if (instructions.count(predicate) != 1) {
return null
}
val putStaticInstructionIndex = instructions.indexOfLast(predicate)
val frame = frames.getOrNull(putStaticInstructionIndex) ?: return null
return evaluateConstantString(classInitializer, frames, frame.getOnStack(0))
} finally {
inVisitFields.removeLast()
}
}
/**
* Analyzes bytecode corresponding to String built with StringBuilder:
* ```
* LDC "One"
* INVOKEVIRTUAL java/lang/StringBuilder.append (Ljava/lang/String;)Ljava/lang/StringBuilder;
* ALOAD 0
* INVOKEVIRTUAL some/SomeClass.someConstantFunction ()Ljava/lang/String;
* INVOKEVIRTUAL java/lang/StringBuilder.append (Ljava/lang/String;)Ljava/lang/StringBuilder;
* GETSTATIC some/SomeClass.SOME_STATIC_FINAL_CONSTANT : Ljava/lang/String;
* INVOKEVIRTUAL java/lang/StringBuilder.append (Ljava/lang/String;)Ljava/lang/StringBuilder;
* ```
*
* It firstly splits the instructions by `StringBuilder.append()`:
* ```
* LDC "One"
* INVOKE someConstantFunction()
* GETSTATIC SOME_STATIC_FINAL_CONSTANT
* ```
*
* Then constructs the result: "One" + someConstantFunction() + SOME_STATIC_FINAL_CONSTANT
*/
private fun evaluateConcatenatedStringValue(
frames: List>,
analyzedMethod: Method,
stringBuildingInstructions: List
): String? {
val isAppendInstruction = { ins: AbstractInsnNode ->
ins is MethodInsnNode && ins.name == "append" && ins.owner == "java/lang/StringBuilder"
}
fun evaluateAppendInstructions(instructions: List): String? {
if (instructions.isEmpty()) {
return null
}
if (instructions.size == 1) {
val single = instructions.single()
return evaluateInstructionConstantString(single, analyzedMethod, frames)
}
if (instructions.size == 2) {
val first = instructions.first()
val second = instructions.last()
if (first is VarInsnNode && first.`var` == 0 && !analyzedMethod.isStatic) {
return evaluateInstructionConstantString(second, analyzedMethod, frames)
}
}
return null
}
val stringResult = StringBuilder()
val nonAppendInstructionParts = stringBuildingInstructions.splitByPredicate(isAppendInstruction)
for (appendInstructionsPart in nonAppendInstructionParts) {
val string = evaluateAppendInstructions(appendInstructionsPart)
?: return null
stringResult.append(string)
}
return stringResult.toString()
}
private fun List.splitByPredicate(predicate: (T) -> Boolean): List> {
val result = arrayListOf>()
val current = arrayListOf()
for (t in this) {
if (predicate(t)) {
result += current.toList()
current.clear()
} else {
current += t
}
}
return result
}
}