From 5a3efc1a98ed29434e02ec6cb64cecf09d00a764 Mon Sep 17 00:00:00 2001
From: Zalim Bashorov <zalim.bashorov@jetbrains.com>
Date: Thu, 1 Jul 2021 21:24:26 +0300
Subject: [PATCH] [JS IR] Fill source info in codegen

#KT-46551 In Progress
---
 .../IrElementToJsExpressionTransformer.kt     | 42 +++++++++----------
 .../IrElementToJsStatementTransformer.kt      | 26 ++++++------
 .../irToJs/IrFileToJsTransformer.kt           |  6 +--
 .../irToJs/IrModuleToJsTransformer.kt         |  1 +
 .../js/transformers/irToJs/jsAstUtils.kt      | 26 +++++++++++-
 .../backend/js/utils/JsGenerationContext.kt   | 17 +++++++-
 .../ir/backend/js/utils/JsStaticContext.kt    |  7 +++-
 7 files changed, 84 insertions(+), 41 deletions(-)

diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrElementToJsExpressionTransformer.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrElementToJsExpressionTransformer.kt
index 23b11138606..9890b348be5 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrElementToJsExpressionTransformer.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrElementToJsExpressionTransformer.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.
  */
 
@@ -40,7 +40,7 @@ class IrElementToJsExpressionTransformer : BaseIrElementToJsNodeTransformer<JsEx
 
     override fun visitVararg(expression: IrVararg, context: JsGenerationContext): JsExpression {
         assert(expression.elements.none { it is IrSpreadElement })
-        return JsArrayLiteral(expression.elements.map { it.accept(this, context) })
+        return JsArrayLiteral(expression.elements.map { it.accept(this, context) }).withSource(expression, context)
     }
 
     override fun visitExpressionBody(body: IrExpressionBody, context: JsGenerationContext): JsExpression =
@@ -64,7 +64,7 @@ class IrElementToJsExpressionTransformer : BaseIrElementToJsNodeTransformer<JsEx
             is IrConstKind.Char -> throw IllegalStateException("Char const should have been lowered at this point")
             is IrConstKind.Float -> JsDoubleLiteral(toDoubleConst(kind.valueOf(expression)))
             is IrConstKind.Double -> JsDoubleLiteral(kind.valueOf(expression))
-        }
+        }.withSource(expression, context)
     }
 
     private fun toDoubleConst(f: Float) = if (f.isInfinite() || f.isNaN()) f.toDouble() else f.toString().toDouble()
@@ -94,19 +94,19 @@ class IrElementToJsExpressionTransformer : BaseIrElementToJsNodeTransformer<JsEx
             return JsNameRef(
                 field.getJsNameOrKotlinName().identifier,
                 context.getNameForClass(fieldParent).makeRef()
-            )
+            ).withSource(expression, context)
         }
 
         if (fieldParent is IrClass && fieldParent.isInline) {
-            return expression.receiver!!.accept(this, context)
+            return expression.receiver!!.accept(this, context).withSource(expression, context)
         }
         val fieldName = context.getNameForField(field)
-        return JsNameRef(fieldName, expression.receiver?.accept(this, context))
+        return JsNameRef(fieldName, expression.receiver?.accept(this, context)).withSource(expression, context)
     }
 
     override fun visitGetValue(expression: IrGetValue, context: JsGenerationContext): JsExpression {
-        if (expression.symbol.owner.isThisReceiver()) return JsThisRef()
-        return context.getNameForValueDeclaration(expression.symbol.owner).makeRef()
+        if (expression.symbol.owner.isThisReceiver()) return JsThisRef().withSource(expression, context)
+        return context.getNameForValueDeclaration(expression.symbol.owner).makeRef().withSource(expression, context)
     }
 
     override fun visitGetObjectValue(expression: IrGetObjectValue, context: JsGenerationContext): JsExpression {
@@ -114,20 +114,20 @@ class IrElementToJsExpressionTransformer : BaseIrElementToJsNodeTransformer<JsEx
         assert(obj.kind == ClassKind.OBJECT)
         assert(obj.isEffectivelyExternal()) { "Non external IrGetObjectValue must be lowered" }
 
-        return context.getRefForExternalClass(obj)
+        return context.getRefForExternalClass(obj).withSource(expression, context)
     }
 
     override fun visitSetField(expression: IrSetField, context: JsGenerationContext): JsExpression {
         val fieldName = context.getNameForField(expression.symbol.owner)
         val dest = JsNameRef(fieldName, expression.receiver?.accept(this, context))
         val source = expression.value.accept(this, context)
-        return jsAssignment(dest, source)
+        return jsAssignment(dest, source).withSource(expression, context)
     }
 
     override fun visitSetValue(expression: IrSetValue, context: JsGenerationContext): JsExpression {
         val ref = JsNameRef(context.getNameForValueDeclaration(expression.symbol.owner))
         val value = expression.value.accept(this, context)
-        return JsBinaryOperation(JsBinaryOperator.ASG, ref, value)
+        return JsBinaryOperation(JsBinaryOperator.ASG, ref, value).withSource(expression, context)
     }
 
     override fun visitDelegatingConstructorCall(expression: IrDelegatingConstructorCall, context: JsGenerationContext): JsExpression {
@@ -143,14 +143,14 @@ class IrElementToJsExpressionTransformer : BaseIrElementToJsNodeTransformer<JsEx
             assert(constructor.isPrimary) {
                 "Delegation to secondary inline constructors must be lowered into simple function calls"
             }
-            return JsBinaryOperation(JsBinaryOperator.ASG, thisRef, arguments.single())
+            return JsBinaryOperation(JsBinaryOperator.ASG, thisRef, arguments.single()).withSource(expression, context)
         }
 
         return if (context.staticContext.backendContext.es6mode) {
             JsInvocation(JsNameRef("super"), arguments)
         } else {
             JsInvocation(callFuncRef, listOf(thisRef) + arguments)
-        }
+        }.withSource(expression, context)
     }
 
     override fun visitConstructorCall(expression: IrConstructorCall, context: JsGenerationContext): JsExpression {
@@ -190,7 +190,7 @@ class IrElementToJsExpressionTransformer : BaseIrElementToJsNodeTransformer<JsEx
                 val ref = context.getNameForClass(klass).makeRef()
                 JsNew(ref, arguments)
             }
-        }
+        }.withSource(expression, context)
     }
 
     override fun visitCall(expression: IrCall, context: JsGenerationContext): JsExpression {
@@ -200,7 +200,7 @@ class IrElementToJsExpressionTransformer : BaseIrElementToJsNodeTransformer<JsEx
 
             val lastStatement = statements.last()
             if (statements.size == 1) {
-                if (lastStatement is JsExpressionStatement) return lastStatement.expression
+                if (lastStatement is JsExpressionStatement) return lastStatement.expression.withSource(expression, context)
             }
 
             val newStatements = statements.toMutableList()
@@ -216,10 +216,10 @@ class IrElementToJsExpressionTransformer : BaseIrElementToJsNodeTransformer<JsEx
             }
 
             val syntheticFunction = JsFunction(emptyScope, JsBlock(newStatements), "")
-            return JsInvocation(syntheticFunction)
+            return JsInvocation(syntheticFunction).withSource(expression, context)
 
         }
-        return translateCall(expression, context, this)
+        return translateCall(expression, context, this).withSource(expression, context)
     }
 
     override fun visitWhen(expression: IrWhen, context: JsGenerationContext): JsExpression {
@@ -239,11 +239,11 @@ class IrElementToJsExpressionTransformer : BaseIrElementToJsNodeTransformer<JsEx
         return when (expression.operator) {
             IrTypeOperator.REINTERPRET_CAST -> expression.argument.accept(this, data)
             else -> error("All type operator calls except REINTERPRET_CAST should be lowered at this point: ${expression.operator}")
-        }
+        }.withSource(expression, data)
     }
 
     override fun visitDynamicMemberExpression(expression: IrDynamicMemberExpression, data: JsGenerationContext): JsExpression =
-        JsNameRef(expression.memberName, expression.receiver.accept(this, data))
+        JsNameRef(expression.memberName, expression.receiver.accept(this, data)).withSource(expression, data)
 
     override fun visitDynamicOperatorExpression(expression: IrDynamicOperatorExpression, data: JsGenerationContext): JsExpression =
         when (expression.operator) {
@@ -294,7 +294,7 @@ class IrElementToJsExpressionTransformer : BaseIrElementToJsNodeTransformer<JsEx
                 )
 
             else -> error("Unexpected operator ${expression.operator}: ${expression.render()}")
-        }
+        }.withSource(expression, data)
 
     override fun visitRawFunctionReference(expression: IrRawFunctionReference, data: JsGenerationContext): JsExpression {
         val name = when (val function = expression.symbol.owner) {
@@ -302,7 +302,7 @@ class IrElementToJsExpressionTransformer : BaseIrElementToJsNodeTransformer<JsEx
             is IrSimpleFunction -> data.getNameForStaticFunction(function)
             else -> error("Unexpected function kind")
         }
-        return JsNameRef(name)
+        return JsNameRef(name).withSource(expression, data)
     }
 
     private fun prefixOperation(operator: JsUnaryOperator, expression: IrDynamicOperatorExpression, data: JsGenerationContext) =
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrElementToJsStatementTransformer.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrElementToJsStatementTransformer.kt
index 4b5563f247c..91f48629289 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrElementToJsStatementTransformer.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrElementToJsStatementTransformer.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.
  */
 
@@ -38,15 +38,15 @@ class IrElementToJsStatementTransformer : BaseIrElementToJsNodeTransformer<JsSta
     }
 
     override fun visitExpression(expression: IrExpression, context: JsGenerationContext): JsStatement {
-        return JsExpressionStatement(expression.accept(IrElementToJsExpressionTransformer(), context))
+        return expression.accept(IrElementToJsExpressionTransformer(), context).makeStmt()
     }
 
     override fun visitBreak(jump: IrBreak, context: JsGenerationContext): JsStatement {
-        return JsBreak(context.getNameForLoop(jump.loop)?.let { JsNameRef(it) })
+        return JsBreak(context.getNameForLoop(jump.loop)?.let { JsNameRef(it) }).withSource(jump, context)
     }
 
     override fun visitContinue(jump: IrContinue, context: JsGenerationContext): JsStatement {
-        return JsContinue(context.getNameForLoop(jump.loop)?.let { JsNameRef(it) })
+        return JsContinue(context.getNameForLoop(jump.loop)?.let { JsNameRef(it) }).withSource(jump, context)
     }
 
     private fun IrExpression.maybeOptimizeIntoSwitch(context: JsGenerationContext, transformer: (JsExpression) -> JsStatement): JsStatement {
@@ -62,20 +62,21 @@ class IrElementToJsStatementTransformer : BaseIrElementToJsNodeTransformer<JsSta
         val fieldName = context.getNameForField(expression.symbol.owner)
         val expressionTransformer = IrElementToJsExpressionTransformer()
         val dest = JsNameRef(fieldName, expression.receiver?.accept(expressionTransformer, context))
-        return expression.value.maybeOptimizeIntoSwitch(context) { jsAssignment(dest, it).makeStmt() }
+        return expression.value.maybeOptimizeIntoSwitch(context) { jsAssignment(dest, it).withSource(expression, context).makeStmt() }
     }
 
     override fun visitSetValue(expression: IrSetValue, context: JsGenerationContext): JsStatement {
         val ref = JsNameRef(context.getNameForValueDeclaration(expression.symbol.owner))
-        return expression.value.maybeOptimizeIntoSwitch(context) { JsBinaryOperation(JsBinaryOperator.ASG, ref, it).makeStmt() }
+        return expression.value
+            .maybeOptimizeIntoSwitch(context) { jsAssignment(ref, it).withSource(expression, context).makeStmt() }
     }
 
     override fun visitReturn(expression: IrReturn, context: JsGenerationContext): JsStatement {
-        return expression.value.maybeOptimizeIntoSwitch(context) { JsReturn(it) }
+        return expression.value.maybeOptimizeIntoSwitch(context) { JsReturn(it) }.withSource(expression, context)
     }
 
     override fun visitThrow(expression: IrThrow, context: JsGenerationContext): JsStatement {
-        return expression.value.maybeOptimizeIntoSwitch(context) { JsThrow(it) }
+        return expression.value.maybeOptimizeIntoSwitch(context) { JsThrow(it) }.withSource(expression, context)
     }
 
     override fun visitVariable(declaration: IrVariable, context: JsGenerationContext): JsStatement {
@@ -90,11 +91,11 @@ class IrElementToJsStatementTransformer : BaseIrElementToJsNodeTransformer<JsSta
             }
 
             SwitchOptimizer(context, transformer).tryOptimize(value)?.let {
-                return JsBlock(JsVars(JsVars.JsVar(varName)), it)
+                return JsBlock(JsVars(JsVars.JsVar(varName)), it).withSource(declaration, context)
             }
         }
 
-        return jsVar(varName, value, context)
+        return jsVar(varName, value, context).withSource(declaration, context)
     }
 
     override fun visitDelegatingConstructorCall(expression: IrDelegatingConstructorCall, context: JsGenerationContext): JsStatement {
@@ -109,12 +110,12 @@ class IrElementToJsStatementTransformer : BaseIrElementToJsNodeTransformer<JsSta
             val statements = translateJsCodeIntoStatementList(expression.getValueArgument(0) ?: error("JsCode is expected"))!!
             return when (statements.size) {
                 0 -> JsEmpty
-                1 -> statements.single()
+                1 -> statements.single().withSource(expression, data)
                 // TODO: use transparent block (e.g. JsCompositeBlock)
                 else -> JsBlock(statements)
             }
         }
-        return translateCall(expression, data, IrElementToJsExpressionTransformer()).makeStmt()
+        return translateCall(expression, data, IrElementToJsExpressionTransformer()).withSource(expression, data).makeStmt()
     }
 
     override fun visitInstanceInitializerCall(expression: IrInstanceInitializerCall, context: JsGenerationContext): JsStatement {
@@ -157,3 +158,4 @@ class IrElementToJsStatementTransformer : BaseIrElementToJsNodeTransformer<JsSta
         return label?.let { JsLabel(it, loopStatement) } ?: loopStatement
     }
 }
+
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrFileToJsTransformer.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrFileToJsTransformer.kt
index 38baf4a814a..fbeaecdebca 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrFileToJsTransformer.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrFileToJsTransformer.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.
  */
 
@@ -12,7 +12,7 @@ import org.jetbrains.kotlin.js.backend.ast.JsGlobalBlock
 
 class IrFileToJsTransformer : BaseIrElementToJsNodeTransformer<JsBlock, JsGenerationContext> {
     override fun visitFile(declaration: IrFile, data: JsGenerationContext): JsBlock {
-        val fileContext = data.newDeclaration()
+        val fileContext = data.newFile(declaration)
         val block = JsGlobalBlock()
 
         declaration.declarations.forEach {
@@ -21,4 +21,4 @@ class IrFileToJsTransformer : BaseIrElementToJsNodeTransformer<JsBlock, JsGenera
 
         return block
     }
-}
\ No newline at end of file
+}
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrModuleToJsTransformer.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrModuleToJsTransformer.kt
index a1f3ab9dbde..cb7326a8eda 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrModuleToJsTransformer.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrModuleToJsTransformer.kt
@@ -136,6 +136,7 @@ class IrModuleToJsTransformer(
             globalNameScope = namer.globalNames
         )
         val rootContext = JsGenerationContext(
+            currentFile = null,
             currentFunction = null,
             staticContext = staticContext,
             localNames = LocalNameGenerator(NameScope.EmptyScope)
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/jsAstUtils.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/jsAstUtils.kt
index 954dde2fb55..ac7df5a6eaf 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/jsAstUtils.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/jsAstUtils.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.
  */
 
@@ -7,6 +7,8 @@ package org.jetbrains.kotlin.ir.backend.js.transformers.irToJs
 
 import org.jetbrains.kotlin.backend.common.ir.isElseBranch
 import org.jetbrains.kotlin.backend.common.ir.isSuspend
+import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.backend.js.JsStatementOrigins
 import org.jetbrains.kotlin.ir.backend.js.utils.*
 import org.jetbrains.kotlin.ir.declarations.IrFunction
@@ -480,3 +482,25 @@ object JsAstUtils {
         return JsVars(JsVars.JsVar(name, expr))
     }
 }
+
+internal fun <T : JsNode> T.withSource(node: IrElement, context: JsGenerationContext): T {
+    addSourceInfoIfNeed(node, context)
+    return this
+}
+
+@Suppress("NOTHING_TO_INLINE")
+private inline fun <T : JsNode> T.addSourceInfoIfNeed(node: IrElement, context: JsGenerationContext) {
+    if (!context.staticContext.genSourcemaps) return
+
+    if (node.startOffset == UNDEFINED_OFFSET || node.endOffset == UNDEFINED_OFFSET) return
+
+    val fileEntry = context.currentFile?.fileEntry ?: return
+
+    val path = fileEntry.name
+    val startLine = fileEntry.getLineNumber(node.startOffset)
+    val startColumn = fileEntry.getColumnNumber(node.startOffset)
+
+    // TODO maybe it's better to fix in JsExpressionStatement
+    val locationTarget = if (this is JsExpressionStatement) this.expression else this
+    locationTarget.source = JsLocation(path, startLine, startColumn)
+}
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/JsGenerationContext.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/JsGenerationContext.kt
index 0ce3066d03f..5adb9cdee7b 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/JsGenerationContext.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/JsGenerationContext.kt
@@ -1,14 +1,16 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.ir.backend.js.utils
 
 import org.jetbrains.kotlin.ir.declarations.IrDeclarationWithName
+import org.jetbrains.kotlin.ir.declarations.IrFile
 import org.jetbrains.kotlin.ir.declarations.IrFunction
 import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
 import org.jetbrains.kotlin.ir.expressions.IrLoop
+import org.jetbrains.kotlin.ir.expressions.IrReturnableBlock
 import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
 import org.jetbrains.kotlin.ir.util.isSuspend
 import org.jetbrains.kotlin.js.backend.ast.JsName
@@ -24,12 +26,23 @@ val emptyScope: JsScope
     }
 
 class JsGenerationContext(
+    val currentFile: IrFile?,
     val currentFunction: IrFunction?,
     val staticContext: JsStaticContext,
     val localNames: LocalNameGenerator? = null
 ): IrNamer by staticContext {
+    fun newFile(file: IrFile? = null, func: IrFunction? = null, localNames: LocalNameGenerator? = null): JsGenerationContext {
+        return JsGenerationContext(
+            currentFile = file,
+            currentFunction = func,
+            staticContext = staticContext,
+            localNames = localNames,
+        )
+    }
+
     fun newDeclaration(func: IrFunction? = null, localNames: LocalNameGenerator? = null): JsGenerationContext {
         return JsGenerationContext(
+            currentFile = currentFile,
             currentFunction = func,
             staticContext = staticContext,
             localNames = localNames,
@@ -66,4 +79,4 @@ class JsGenerationContext(
     }
 
     fun checkIfJsCode(symbol: IrFunctionSymbol): Boolean = symbol == staticContext.backendContext.intrinsics.jsCode
-}
\ No newline at end of file
+}
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/JsStaticContext.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/JsStaticContext.kt
index b4bc41721cc..e854a10efcf 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/JsStaticContext.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/JsStaticContext.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.
  */
 
@@ -10,6 +10,7 @@ import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.JsIntrinsicTransfo
 import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.JsIrClassModel
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.js.backend.ast.JsGlobalBlock
+import org.jetbrains.kotlin.js.config.JSConfigurationKeys
 
 
 class JsStaticContext(
@@ -22,4 +23,6 @@ class JsStaticContext(
     val coroutineImplDeclaration = backendContext.ir.symbols.coroutineImpl.owner
 
     val initializerBlock = JsGlobalBlock()
-}
\ No newline at end of file
+
+    val genSourcemaps = backendContext.configuration.getBoolean(JSConfigurationKeys.SOURCE_MAP)
+}