Kotlin: converge implicit primary constructor locations onto the K2-native class span

The K1 and K2 frontends record different source locations for the
compiler-synthesised primary constructor of a class that declares no primary
constructor in source. K2 uses the class declaration's raw IR offsets, which
include any leading modifier keywords, while K1's raw offsets start at the
`class` keyword and omit the modifiers.

Since K1 (unlike K2) retains the PSI, we recover the modifier-inclusive span
from the enclosing KtClassOrObject so K1 matches the K2-native span.

Example, for `open class C0<V> {}` on line 11 (the `open` modifier is at
column 1, the `class` keyword at column 6):

  before (K1):  generics.kt:11:6:11:19 | C0 | C0()
  after  (K1):  generics.kt:11:1:11:19 | C0 | C0()   (matches K2)

The fix is deliberately narrow and leaves all other constructors untouched:
 - explicit primary constructors (`class C1(val t: T)`, `class C2()`) keep
   their own parameter-list location, which both frontends already agree on;
 - explicit secondary constructors keep their own location (only the
   `isPrimary` constructor is adjusted);
 - specialised/parameterised copies of a generic constructor
   (`typeSubstitution != null`) are excluded, so they do not gain a spurious
   source location and appear in source-filtered queries.

Relearned test-kotlin1 (K1) and test-kotlin2 (K2): all 3333 tests pass with
database-consistency checks. Only test-kotlin1 expected files change (K2 output
is unchanged, as K2 already emits these spans natively). No previously matching
row diverges; net K1-vs-K2 divergence decreases on every affected file, with
generics, generic-inner-classes and modifiers now fully identical.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: andersfugmann

java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt

@@ -53,6 +53,8 @@ import org.jetbrains.kotlin.load.java.structure.impl.classFiles.BinaryJavaClass
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.types.Variance
 import org.jetbrains.kotlin.util.OperatorNameConventions
+import org.jetbrains.kotlin.psi.KtClass
+import org.jetbrains.kotlin.psi.KtClassOrObject
 import org.jetbrains.kotlin.psi.KtProperty
 import org.jetbrains.kotlin.psi.KtPropertyAccessor
 import org.jetbrains.kotlin.psi.KtVariableDeclaration
@@ -2462,6 +2464,7 @@ open class KotlinFileExtractor(
                 val locId =
                     overriddenAttributes?.sourceLoc
                         ?: (if (usesK2) getPsiBasedLocation(f) else null)
+                        ?: (if (f.symbol is IrConstructorSymbol && typeSubstitution == null) getPsiBasedImplicitConstructorLocation(f) else null)
                         ?: getLocation(f, classTypeArgsIncludingOuterClasses)
 
                 if (f.symbol is IrConstructorSymbol) {
@@ -3038,6 +3041,41 @@ open class KotlinFileExtractor(
         return tw.getLocation(declStart, declEnd)
     }
 
+    /**
+     * Returns the PSI-based location for the *implicit* (compiler-synthesised)
+     * primary constructor of [f]'s enclosing class, spanning the full
+     * [KtClassOrObject] text range (including any leading modifiers such as `open`).
+     *
+     * When a class has no primary constructor written in source (for example
+     * `open class C0<V> {}`), the compiler synthesises one. The K2 frontend records
+     * that constructor with the class declaration's raw IR offsets, which include
+     * the leading modifier keywords. The K1 frontend's raw offsets for the same
+     * synthesised constructor start at the `class` keyword and omit the modifiers.
+     * K1 retains the PSI, so we recover the modifier-inclusive span from the
+     * enclosing [KtClassOrObject] to match K2.
+     *
+     * This deliberately does *not* apply to an *explicit* primary constructor
+     * (e.g. `class C1(val t: T)` or `class C2()`): those keep their own
+     * parameter-list location, which both frontends already record identically from
+     * raw IR offsets. It returns null when the [KtFile] is unavailable (as under K2,
+     * where the raw offsets already carry the class span) or when the enclosing
+     * class declares an explicit primary constructor.
+     */
+    private fun getPsiBasedImplicitConstructorLocation(f: IrFunction): Label<DbLocation>? {
+        if ((f as? IrConstructor)?.isPrimary != true) return null
+        val c = f.parentAsClass
+        val startOffset = c.startOffset
+        if (startOffset < 0) return null
+        val file = currentIrFile ?: return null
+        val ktClass = getPsi2Ir()?.getKtFile(file)
+            ?.findElementAt(startOffset)
+            ?.let { leaf -> generateSequence(leaf) { it.parent }.filterIsInstance<KtClassOrObject>().firstOrNull() }
+            ?: return null
+        // An explicit primary constructor keeps its own (parameter-list) location.
+        if ((ktClass as? KtClass)?.primaryConstructor != null) return null
+        return tw.getLocation(ktClass.startOffset, ktClass.endOffset)
+    }
+
     private fun extractVariable(
         v: IrVariable,
         callable: Label<out DbCallable>,

java/ql/test-kotlin1/library-tests/controlflow/basic/bbStmts.expected

@@ -1,12 +1,12 @@
-| Test.kt:3:8:80:1 | Entry | 0 | Test.kt:3:8:80:1 | Entry |
-| Test.kt:3:8:80:1 | Entry | 1 | Test.kt:3:8:80:1 | { ... } |
-| Test.kt:3:8:80:1 | Entry | 2 | Test.kt:3:1:80:1 | Before super(...) |
-| Test.kt:3:8:80:1 | Entry | 3 | Test.kt:3:1:80:1 | super(...) |
-| Test.kt:3:8:80:1 | Entry | 4 | Test.kt:3:1:80:1 | After super(...) |
-| Test.kt:3:8:80:1 | Entry | 5 | Test.kt:3:8:80:1 | { ... } |
-| Test.kt:3:8:80:1 | Entry | 6 | Test.kt:3:8:80:1 | After { ... } |
-| Test.kt:3:8:80:1 | Entry | 7 | Test.kt:3:8:80:1 | Normal Exit |
-| Test.kt:3:8:80:1 | Entry | 8 | Test.kt:3:8:80:1 | Exit |
+| Test.kt:3:1:80:1 | Entry | 0 | Test.kt:3:1:80:1 | Entry |
+| Test.kt:3:1:80:1 | Entry | 1 | Test.kt:3:8:80:1 | { ... } |
+| Test.kt:3:1:80:1 | Entry | 2 | Test.kt:3:1:80:1 | Before super(...) |
+| Test.kt:3:1:80:1 | Entry | 3 | Test.kt:3:1:80:1 | super(...) |
+| Test.kt:3:1:80:1 | Entry | 4 | Test.kt:3:1:80:1 | After super(...) |
+| Test.kt:3:1:80:1 | Entry | 5 | Test.kt:3:8:80:1 | { ... } |
+| Test.kt:3:1:80:1 | Entry | 6 | Test.kt:3:8:80:1 | After { ... } |
+| Test.kt:3:1:80:1 | Entry | 7 | Test.kt:3:1:80:1 | Normal Exit |
+| Test.kt:3:1:80:1 | Entry | 8 | Test.kt:3:1:80:1 | Exit |
 | Test.kt:4:2:79:2 | Entry | 0 | Test.kt:4:2:79:2 | Entry |
 | Test.kt:4:2:79:2 | Entry | 1 | Test.kt:4:13:79:2 | { ... } |
 | Test.kt:4:2:79:2 | Entry | 2 | Test.kt:5:3:5:16 | var ...; |

java/ql/test-kotlin1/library-tests/controlflow/basic/getASuccessor.expected

@@ -1,9 +1,9 @@
 #select
+| Test.kt:3:1:80:1 | Entry | Constructor | Test.kt:3:8:80:1 | { ... } | BlockStmt |
+| Test.kt:3:1:80:1 | Normal Exit | Constructor | Test.kt:3:1:80:1 | Exit | Constructor |
 | Test.kt:3:1:80:1 | super(...) | SuperConstructorInvocationStmt | Test.kt:3:8:80:1 | { ... } | BlockStmt |
-| Test.kt:3:8:80:1 | Entry | Constructor | Test.kt:3:8:80:1 | { ... } | BlockStmt |
-| Test.kt:3:8:80:1 | Normal Exit | Constructor | Test.kt:3:8:80:1 | Exit | Constructor |
+| Test.kt:3:8:80:1 | { ... } | BlockStmt | Test.kt:3:1:80:1 | Normal Exit | Constructor |
 | Test.kt:3:8:80:1 | { ... } | BlockStmt | Test.kt:3:1:80:1 | super(...) | SuperConstructorInvocationStmt |
-| Test.kt:3:8:80:1 | { ... } | BlockStmt | Test.kt:3:8:80:1 | Normal Exit | Constructor |
 | Test.kt:4:2:79:2 | Entry | Method | Test.kt:4:13:79:2 | { ... } | BlockStmt |
 | Test.kt:4:2:79:2 | Normal Exit | Method | Test.kt:4:2:79:2 | Exit | Method |
 | Test.kt:4:13:79:2 | { ... } | BlockStmt | Test.kt:5:3:5:16 | var ...; | LocalVariableDeclStmt |

java/ql/test-kotlin1/library-tests/exprs/exprs.expected

@@ -1474,11 +1474,11 @@
 | exprs.kt:170:9:170:17 | r2.height | exprs.kt:165:1:172:1 | foo | VarAccess |
 | exprs.kt:170:9:170:21 | ...=... | exprs.kt:165:1:172:1 | foo | AssignExpr |
 | exprs.kt:170:21:170:21 | 3 | exprs.kt:165:1:172:1 | foo | IntegerLiteral |
-| exprs.kt:174:1:176:1 | 0 | exprs.kt:174:6:176:1 | Direction | IntegerLiteral |
-| exprs.kt:174:1:176:1 | Direction | exprs.kt:174:6:176:1 | Direction | TypeAccess |
-| exprs.kt:174:1:176:1 | Enum<Direction> | exprs.kt:174:6:176:1 | Direction | TypeAccess |
-| exprs.kt:174:1:176:1 | new Enum(...) | exprs.kt:174:6:176:1 | Direction | ClassInstanceExpr |
-| exprs.kt:174:1:176:1 | null | exprs.kt:174:6:176:1 | Direction | NullLiteral |
+| exprs.kt:174:1:176:1 | 0 | exprs.kt:174:1:176:1 | Direction | IntegerLiteral |
+| exprs.kt:174:1:176:1 | Direction | exprs.kt:174:1:176:1 | Direction | TypeAccess |
+| exprs.kt:174:1:176:1 | Enum<Direction> | exprs.kt:174:1:176:1 | Direction | TypeAccess |
+| exprs.kt:174:1:176:1 | new Enum(...) | exprs.kt:174:1:176:1 | Direction | ClassInstanceExpr |
+| exprs.kt:174:1:176:1 | null | exprs.kt:174:1:176:1 | Direction | NullLiteral |
 | exprs.kt:175:5:175:10 | ...=... | exprs.kt:0:0:0:0 | <clinit> | KtInitializerAssignExpr |
 | exprs.kt:175:5:175:10 | Direction | exprs.kt:0:0:0:0 | <clinit> | TypeAccess |
 | exprs.kt:175:5:175:10 | Direction | exprs.kt:0:0:0:0 | <clinit> | TypeAccess |

java/ql/test-kotlin1/library-tests/generic-inner-classes/test.expected

@@ -33,12 +33,12 @@ paramTypes
 | file:///!unknown-binary-location/testuser/OuterNotGeneric$InnerGeneric.class:0:0:0:0 | InnerGeneric<String> | String |
 constructors
 | KotlinUser.kt:3:1:18:1 | User |
-| OuterGeneric.kt:3:8:21:1 | OuterGeneric |
-| OuterGeneric.kt:5:16:9:3 | InnerNotGeneric |
+| OuterGeneric.kt:3:1:21:1 | OuterGeneric |
+| OuterGeneric.kt:5:3:9:3 | InnerNotGeneric |
 | OuterGeneric.kt:13:5:13:21 | InnerGeneric |
 | OuterGeneric.kt:15:5:15:25 | InnerGeneric |
-| OuterNotGeneric.kt:3:8:11:1 | OuterNotGeneric |
-| OuterNotGeneric.kt:5:16:9:3 | InnerGeneric |
+| OuterNotGeneric.kt:3:1:11:1 | OuterNotGeneric |
+| OuterNotGeneric.kt:5:3:9:3 | InnerGeneric |
 | file:///!unknown-binary-location/testuser/OuterGeneric$InnerGeneric.class:0:0:0:0 | InnerGeneric<String> |
 | file:///!unknown-binary-location/testuser/OuterGeneric$InnerGeneric.class:0:0:0:0 | InnerGeneric<String> |
 | file:///!unknown-binary-location/testuser/OuterGeneric$InnerNotGeneric.class:0:0:0:0 | InnerNotGeneric<> |

java/ql/test-kotlin1/library-tests/generics/generics.expected

@@ -29,7 +29,7 @@ parameterizedType
 function
 | generics.kt:3:1:5:1 | f0 | f0(int,java.lang.Object) |
 | generics.kt:7:1:9:1 | f1 | f1(int,java.lang.Object) |
-| generics.kt:11:6:11:19 | C0 | C0() |
+| generics.kt:11:1:11:19 | C0 | C0() |
 | generics.kt:13:15:13:24 | C1 | C1(java.lang.Object) |
 | generics.kt:13:16:13:23 | getT | getT() |
 | generics.kt:14:5:14:19 | f1 | f1(java.lang.Object) |
@@ -40,7 +40,7 @@ function
 | generics.kt:36:1:40:1 | BoundedTest | BoundedTest() |
 | generics.kt:38:5:38:25 | m | m(java.lang.CharSequence,java.lang.CharSequence) |
 | generics.kt:42:1:54:1 | Outer | Outer() |
-| generics.kt:43:11:47:5 | Inner1 | Inner1() |
+| generics.kt:43:5:47:5 | Inner1 | Inner1() |
 | generics.kt:44:9:46:9 | fn1 | fn1(java.lang.Object,java.lang.Object,java.lang.Object,java.lang.Object) |
 | generics.kt:49:5:53:5 | Nested1 | Nested1() |
 | generics.kt:50:9:52:9 | fn2 | fn2(java.lang.Object,java.lang.Object) |

java/ql/test-kotlin1/library-tests/methods/constructors.expected

@@ -6,7 +6,7 @@
 | delegates.kt:8:32:11:5 |  | delegates.kt:8:32:11:5 | new KMutableProperty1<MyClass,String>(...) { ... } | file://:0:0:0:0 | void |
 | delegates.kt:8:66:11:5 |  | delegates.kt:8:66:11:5 | new Function3<KProperty<?>,String,String,Unit>(...) { ... } | file://:0:0:0:0 | void |
 | enumClass.kt:1:21:1:32 | EnumClass | enumClass.kt:1:1:4:1 | EnumClass | file://:0:0:0:0 | void |
-| enumClass.kt:6:6:16:1 | EnumWithFunctions | enumClass.kt:6:1:16:1 | EnumWithFunctions | file://:0:0:0:0 | void |
+| enumClass.kt:6:1:16:1 | EnumWithFunctions | enumClass.kt:6:1:16:1 | EnumWithFunctions | file://:0:0:0:0 | void |
 | enumClass.kt:8:3:11:4 | VAL | enumClass.kt:8:3:11:4 | VAL | file://:0:0:0:0 | void |
 | methods2.kt:7:1:10:1 | Class2 | methods2.kt:7:1:10:1 | Class2 | file://:0:0:0:0 | void |
 | methods3.kt:5:1:7:1 | Class3 | methods3.kt:5:1:7:1 | Class3 | file://:0:0:0:0 | void |

java/ql/test-kotlin1/library-tests/methods/methods.expected

@@ -67,7 +67,7 @@ constructors
 | delegates.kt:8:32:11:5 | new KMutableProperty1<MyClass,String>(...) { ... } | delegates.kt:8:32:11:5 |  |  |
 | delegates.kt:8:66:11:5 | new Function3<KProperty<?>,String,String,Unit>(...) { ... } | delegates.kt:8:66:11:5 |  |  |
 | enumClass.kt:1:1:4:1 | EnumClass | enumClass.kt:1:21:1:32 | EnumClass | EnumClass(int) |
-| enumClass.kt:6:1:16:1 | EnumWithFunctions | enumClass.kt:6:6:16:1 | EnumWithFunctions | EnumWithFunctions() |
+| enumClass.kt:6:1:16:1 | EnumWithFunctions | enumClass.kt:6:1:16:1 | EnumWithFunctions | EnumWithFunctions() |
 | enumClass.kt:8:3:11:4 | VAL | enumClass.kt:8:3:11:4 | VAL | VAL() |
 | methods2.kt:7:1:10:1 | Class2 | methods2.kt:7:1:10:1 | Class2 | Class2() |
 | methods3.kt:5:1:7:1 | Class3 | methods3.kt:5:1:7:1 | Class3 | Class3() |

java/ql/test-kotlin1/library-tests/modifiers/modifiers.expected

@@ -1,5 +1,5 @@
 | modifiers.kt:1:1:29:1 | X | Class | public |
-| modifiers.kt:1:6:29:1 | X | Constructor | public |
+| modifiers.kt:1:1:29:1 | X | Constructor | public |
 | modifiers.kt:2:13:2:17 | getA$private | Method | final |
 | modifiers.kt:2:13:2:17 | getA$private | Method | private |
 | modifiers.kt:2:13:2:21 | a | Field | final |
@@ -22,7 +22,7 @@
 | modifiers.kt:5:5:5:34 | d | Property | public |
 | modifiers.kt:7:5:9:5 | Nested | Class | final |
 | modifiers.kt:7:5:9:5 | Nested | Class | protected |
-| modifiers.kt:7:15:9:5 | Nested | Constructor | public |
+| modifiers.kt:7:5:9:5 | Nested | Constructor | public |
 | modifiers.kt:8:16:8:25 | getE | Method | final |
 | modifiers.kt:8:16:8:25 | getE | Method | public |
 | modifiers.kt:8:16:8:29 | e | Field | final |
@@ -74,7 +74,7 @@
 | modifiers.kt:32:5:32:32 | foo | Method | public |
 | modifiers.kt:35:1:41:1 | LateInit | Class | final |
 | modifiers.kt:35:1:41:1 | LateInit | Class | public |
-| modifiers.kt:35:8:41:1 | LateInit | Constructor | public |
+| modifiers.kt:35:1:41:1 | LateInit | Constructor | public |
 | modifiers.kt:36:22:36:40 | getTest0$private | Method | final |
 | modifiers.kt:36:22:36:40 | getTest0$private | Method | private |
 | modifiers.kt:36:22:36:40 | setTest0$private | Method | final |