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/*
* Copyright 2010-2015 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.codegen.intrinsics
import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.codegen.*
import org.jetbrains.kotlin.codegen.AsmUtil.genInvokeAppendMethod
import org.jetbrains.kotlin.codegen.AsmUtil.genStringBuilderConstructor
import org.jetbrains.kotlin.lexer.KtTokens
import org.jetbrains.kotlin.psi.KtBinaryExpression
import org.jetbrains.kotlin.psi.KtCallableReferenceExpression
import org.jetbrains.kotlin.psi.KtExpression
import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
import org.jetbrains.kotlin.resolve.jvm.AsmTypes
import org.jetbrains.kotlin.resolve.jvm.AsmTypes.JAVA_STRING_TYPE
import org.jetbrains.org.objectweb.asm.Opcodes
import org.jetbrains.org.objectweb.asm.Type
import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter
class Concat : IntrinsicMethod() {
fun generateImpl(
codegen: ExpressionCodegen,
v: InstructionAdapter,
returnType: Type,
element: PsiElement?,
arguments: List,
receiver: StackValue
): Type {
if (element is KtBinaryExpression && element.operationReference.getReferencedNameElementType() == KtTokens.PLUS) {
// LHS + RHS
genStringBuilderConstructor(v)
codegen.invokeAppend(element.left)
codegen.invokeAppend(element.right)
}
else {
// LHS?.plus(RHS)
receiver.put(AsmTypes.OBJECT_TYPE, v)
genStringBuilderConstructor(v)
v.swap()
genInvokeAppendMethod(v, returnType)
codegen.invokeAppend(arguments.get(0))
}
v.invokevirtual("java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false)
return JAVA_STRING_TYPE
}
override fun toCallable(method: CallableMethod): Callable =
object : IntrinsicCallable(method) {
override fun invokeMethodWithArguments(
resolvedCall: ResolvedCall<*>,
receiver: StackValue,
codegen: ExpressionCodegen
): StackValue {
if (resolvedCall.call.callElement.parent is KtCallableReferenceExpression) {
// NB we come here only in case of inlined callable reference to String::plus.
// This will map arguments properly, invoking callbacks defined in Callable.
return super.invokeMethodWithArguments(resolvedCall, receiver, codegen)
}
return StackValue.operation(returnType) {
val arguments = resolvedCall.call.valueArguments.map { it.getArgumentExpression()!! }
val actualType = generateImpl(
codegen, it, returnType,
resolvedCall.call.callElement,
arguments,
StackValue.receiver(resolvedCall, receiver, codegen, this)
)
StackValue.coerce(actualType, returnType, it)
}
}
override fun afterReceiverGeneration(v: InstructionAdapter) {
v.visitTypeInsn(Opcodes.NEW, "java/lang/StringBuilder")
v.dupX1()
v.swap()
v.invokespecial("java/lang/StringBuilder", "", "(Ljava/lang/String;)V", false)
}
override fun invokeIntrinsic(v: InstructionAdapter) {
// String::plus has type String.(Any?) -> String, thus we have no argument type information
// in case of callable reference passed to a generic function, e.g.:
// charArrayOf('O', 'K').fold("", String::plus)
// TODO Make String::plus generic, and invoke proper StringBuilder#append.
AsmUtil.genInvokeAppendMethod(v, AsmTypes.OBJECT_TYPE)
v.invokevirtual("java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false)
}
}
}
