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/*
* Copyright 2010-2016 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.backend.jvm.intrinsics
import com.intellij.psi.tree.IElementType
import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
import org.jetbrains.kotlin.backend.jvm.codegen.*
import org.jetbrains.kotlin.backend.jvm.ir.isSmartcastFromHigherThanNullable
import org.jetbrains.kotlin.builtins.PrimitiveType
import org.jetbrains.kotlin.codegen.AsmUtil
import org.jetbrains.kotlin.codegen.AsmUtil.comparisonOperandType
import org.jetbrains.kotlin.codegen.BranchedValue
import org.jetbrains.kotlin.codegen.NumberCompare
import org.jetbrains.kotlin.codegen.ObjectCompare
import org.jetbrains.kotlin.config.LanguageFeature
import org.jetbrains.kotlin.ir.expressions.IrFunctionAccessExpression
import org.jetbrains.kotlin.lexer.KtSingleValueToken
import org.jetbrains.kotlin.resolve.jvm.JvmPrimitiveType
import org.jetbrains.kotlin.resolve.jvm.jvmSignature.JvmMethodSignature
import org.jetbrains.org.objectweb.asm.Label
import org.jetbrains.org.objectweb.asm.Opcodes
import org.jetbrains.org.objectweb.asm.Type
import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter
object CompareTo : IntrinsicMethod() {
private fun genInvoke(type: Type?, v: InstructionAdapter) {
when (type) {
Type.CHAR_TYPE, Type.BYTE_TYPE, Type.SHORT_TYPE, Type.INT_TYPE ->
v.invokestatic(
IrIntrinsicMethods.INTRINSICS_CLASS_NAME,
"compare",
"(II)I",
false
)
Type.LONG_TYPE -> v.invokestatic(IrIntrinsicMethods.INTRINSICS_CLASS_NAME, "compare", "(JJ)I", false)
Type.FLOAT_TYPE -> v.invokestatic("java/lang/Float", "compare", "(FF)I", false)
Type.DOUBLE_TYPE -> v.invokestatic("java/lang/Double", "compare", "(DD)I", false)
else -> throw UnsupportedOperationException()
}
}
override fun toCallable(
expression: IrFunctionAccessExpression,
signature: JvmMethodSignature,
context: JvmBackendContext
): IrIntrinsicFunction {
val parameterType = comparisonOperandType(
expressionType(expression.dispatchReceiver ?: expression.extensionReceiver!!, context),
signature.valueParameters.single().asmType
)
return IrIntrinsicFunction.create(expression, signature, context, listOf(parameterType, parameterType)) {
genInvoke(parameterType, it)
}
}
}
class IntegerZeroComparison(val op: IElementType, val a: MaterialValue) : BooleanValue(a.codegen) {
override fun jumpIfFalse(target: Label) {
mv.visitJumpInsn(Opcodes.IFNE, target)
}
override fun jumpIfTrue(target: Label) {
mv.visitJumpInsn(Opcodes.IFEQ, target)
}
override fun discard() {
a.discard()
}
}
class BooleanComparison(val op: IElementType, val a: MaterialValue, val b: MaterialValue) : BooleanValue(a.codegen) {
override fun jumpIfFalse(target: Label) {
// TODO 1. get rid of the dependency; 2. take `b.type` into account.
val opcode = if (a.type.sort == Type.OBJECT)
ObjectCompare.getObjectCompareOpcode(op)
else
NumberCompare.patchOpcode(NumberCompare.getNumberCompareOpcode(op), mv, op, a.type)
mv.visitJumpInsn(opcode, target)
}
override fun jumpIfTrue(target: Label) {
val opcode = if (a.type.sort == Type.OBJECT)
BranchedValue.negatedOperations[ObjectCompare.getObjectCompareOpcode(op)]!!
else
NumberCompare.patchOpcode(BranchedValue.negatedOperations[NumberCompare.getNumberCompareOpcode(op)]!!, mv, op, a.type)
mv.visitJumpInsn(opcode, target)
}
override fun discard() {
b.discard()
a.discard()
}
}
class NonIEEE754FloatComparison(val op: IElementType, val a: MaterialValue, val b: MaterialValue) : BooleanValue(a.codegen) {
private val numberCompareOpcode = NumberCompare.getNumberCompareOpcode(op)
private fun invokeStaticComparison(type: Type) {
when (type) {
Type.FLOAT_TYPE -> mv.invokestatic("java/lang/Float", "compare", "(FF)I", false)
Type.DOUBLE_TYPE -> mv.invokestatic("java/lang/Double", "compare", "(DD)I", false)
else -> throw UnsupportedOperationException()
}
}
override fun jumpIfFalse(target: Label) {
invokeStaticComparison(a.type)
mv.visitJumpInsn(numberCompareOpcode, target)
}
override fun jumpIfTrue(target: Label) {
invokeStaticComparison(a.type)
mv.visitJumpInsn(BranchedValue.negatedOperations[numberCompareOpcode]!!, target)
}
override fun discard() {
b.discard()
a.discard()
}
}
class PrimitiveToObjectComparison(
private val op: IElementType,
private val leftIsPrimitive: Boolean,
private val left: MaterialValue,
private val right: MaterialValue
) : BooleanValue(left.codegen) {
private fun checkTypeAndCompare(onWrongType: Label): BooleanValue {
val compareLabel = Label()
// If it's the left value that needs unboxing, it should be moved to the top of the stack. `AsmUtil.swap`
// is theoretically OK, but in practice breaks peephole optimization passes that unbox longs/doubles,
// so just storing in a variable is safer.
val tmp = if (leftIsPrimitive) -1 else codegen.frameMap.enterTemp(right.type).also { mv.store(it, right.type) }
mv.dup()
if (AsmUtil.isBoxedPrimitiveType(if (leftIsPrimitive) right.type else left.type)) {
mv.ifnonnull(compareLabel)
} else {
mv.instanceOf(AsmUtil.boxType(if (leftIsPrimitive) left.type else right.type))
mv.ifne(compareLabel)
}
// Type checking of the object failed, values are irrelevant now:
if (leftIsPrimitive) right.discard() // else it's already popped by `mv.store`
left.discard()
mv.goTo(onWrongType)
mv.mark(compareLabel)
// Type checking OK, can unbox and compare:
return if (leftIsPrimitive) {
BooleanComparison(op, left, right.materializedAt(left.type, right.irType))
} else {
val leftUnboxed = left.materializedAt(right.type, left.irType)
mv.load(tmp, right.type)
codegen.frameMap.leaveTemp(right.type)
BooleanComparison(op, leftUnboxed, right)
}
}
override fun jumpIfFalse(target: Label) {
checkTypeAndCompare(target).jumpIfFalse(target)
}
override fun jumpIfTrue(target: Label) {
val wrongType = Label()
checkTypeAndCompare(wrongType).jumpIfTrue(target)
mv.mark(wrongType)
}
override fun discard() {
right.discard()
left.discard()
}
}
class PrimitiveComparison(
private val primitiveNumberType: PrimitiveType,
private val operatorToken: KtSingleValueToken
) : IntrinsicMethod() {
override fun invoke(expression: IrFunctionAccessExpression, codegen: ExpressionCodegen, data: BlockInfo): PromisedValue? {
val parameterType = Type.getType(JvmPrimitiveType.get(primitiveNumberType).desc)
val (left, right) = expression.receiverAndArgs()
val a = left.accept(codegen, data).materializedAt(parameterType, left.type)
val b = right.accept(codegen, data).materializedAt(parameterType, right.type)
val useNonIEEE754Comparison =
!codegen.context.state.languageVersionSettings.supportsFeature(LanguageFeature.ProperIeee754Comparisons)
&& (parameterType == Type.FLOAT_TYPE || parameterType == Type.DOUBLE_TYPE)
&& (left.isSmartcastFromHigherThanNullable(codegen.context) || right.isSmartcastFromHigherThanNullable(codegen.context))
return if (useNonIEEE754Comparison) {
NonIEEE754FloatComparison(operatorToken, a, b)
} else {
BooleanComparison(operatorToken, a, b)
}
}
}
