FIR LT: Introduce source file abstraction, carry it from parsing to IR

along with source lines mapping, allows to "emulate" usage of the
PSI files which allows to extract source file and line mapping info
on every stage from source element.
It makes sense to use this mapping for the error reporting too.

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/FirFile.kt

@@ -6,6 +6,8 @@
 package org.jetbrains.kotlin.fir.declarations
 
 import org.jetbrains.kotlin.KtSourceElement
+import org.jetbrains.kotlin.KtSourceFile
+import org.jetbrains.kotlin.KtSourceFileLinesMapping
 import org.jetbrains.kotlin.fir.FirElement
 import org.jetbrains.kotlin.fir.FirModuleData
 import org.jetbrains.kotlin.fir.FirPackageDirective
@@ -29,7 +31,8 @@ abstract class FirFile : FirDeclaration() {
     abstract val imports: List<FirImport>
     abstract val declarations: List<FirDeclaration>
     abstract val name: String
-    abstract val path: String?
+    abstract val sourceFile: KtSourceFile?
+    abstract val sourceFileLinesMapping: KtSourceFileLinesMapping?
     abstract override val symbol: FirFileSymbol
 
     override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R = visitor.visitFile(this, data)

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/builder/FirFileBuilder.kt

@@ -7,6 +7,8 @@ package org.jetbrains.kotlin.fir.declarations.builder
 
 import kotlin.contracts.*
 import org.jetbrains.kotlin.KtSourceElement
+import org.jetbrains.kotlin.KtSourceFile
+import org.jetbrains.kotlin.KtSourceFileLinesMapping
 import org.jetbrains.kotlin.fir.FirModuleData
 import org.jetbrains.kotlin.fir.FirPackageDirective
 import org.jetbrains.kotlin.fir.builder.FirAnnotationContainerBuilder
@@ -39,7 +41,8 @@ class FirFileBuilder : FirAnnotationContainerBuilder {
     val imports: MutableList<FirImport> = mutableListOf()
     val declarations: MutableList<FirDeclaration> = mutableListOf()
     lateinit var name: String
-    var path: String? = null
+    var sourceFile: KtSourceFile? = null
+    var sourceFileLinesMapping: KtSourceFileLinesMapping? = null
 
     override fun build(): FirFile {
         return FirFileImpl(
@@ -53,7 +56,8 @@ class FirFileBuilder : FirAnnotationContainerBuilder {
             imports,
             declarations,
             name,
-            path,
+            sourceFile,
+            sourceFileLinesMapping,
         )
     }
 

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/impl/FirFileImpl.kt

@@ -6,6 +6,8 @@
 package org.jetbrains.kotlin.fir.declarations.impl
 
 import org.jetbrains.kotlin.KtSourceElement
+import org.jetbrains.kotlin.KtSourceFile
+import org.jetbrains.kotlin.KtSourceFileLinesMapping
 import org.jetbrains.kotlin.fir.FirModuleData
 import org.jetbrains.kotlin.fir.FirPackageDirective
 import org.jetbrains.kotlin.fir.declarations.FirDeclaration
@@ -35,7 +37,8 @@ internal class FirFileImpl(
     override val imports: MutableList<FirImport>,
     override val declarations: MutableList<FirDeclaration>,
     override val name: String,
-    override val path: String?,
+    override val sourceFile: KtSourceFile?,
+    override val sourceFileLinesMapping: KtSourceFileLinesMapping?,
 ) : FirFile() {
     override val symbol: FirFileSymbol = FirFileSymbol()
 

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/NodeConfigurator.kt

@@ -415,7 +415,8 @@ object NodeConfigurator : AbstractFieldConfigurator<FirTreeBuilder>(FirTreeBuild
             +fieldList(import).withTransform()
             +declarations.withTransform()
             +stringField("name")
-            +stringField("path", nullable = true)
+            +field("sourceFile", sourceFileType, nullable = true)
+            +field("sourceFileLinesMapping", sourceFileLinesMappingType, nullable = true)
             +symbol("FirFileSymbol")
         }
 

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/Types.kt

@@ -6,6 +6,8 @@
 package org.jetbrains.kotlin.fir.tree.generator
 
 import org.jetbrains.kotlin.KtSourceElement
+import org.jetbrains.kotlin.KtSourceFile
+import org.jetbrains.kotlin.KtSourceFileLinesMapping
 import org.jetbrains.kotlin.contracts.description.EventOccurrencesRange
 import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.descriptors.Modality
@@ -23,6 +25,8 @@ import org.jetbrains.kotlin.types.SmartcastStability
 import org.jetbrains.kotlin.types.Variance
 
 val sourceElementType = type(KtSourceElement::class)
+val sourceFileType = type(KtSourceFile::class)
+val sourceFileLinesMappingType = type(KtSourceFileLinesMapping::class)
 val jumpTargetType = type("fir", "FirTarget")
 val constKindType = type("types", "ConstantValueKind")
 val operationType = type("fir.expressions", "FirOperation")