FIR CFG: route to exit of try main for throw in try main

to make the remaining part of try main marked as dead.

^KT-45475 Fixed

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/dfa/cfg/ControlFlowGraphBuilder.kt

@@ -1272,10 +1272,10 @@ class ControlFlowGraphBuilder {
                     // (4)... in catch, i.e., re-throw.
                     exitTargetsForTry.top()
                 } else {
-                    // (4)... in try-main. We already have:
-                    // edges from try-main enter node to each catch clause enter node and
-                    // edges from catch clause enter node to exit target (w/ UncaughtExceptionPath)
-                    return
+                    // (4)... in try-main. Route to exit of try main block.
+                    // We already have edges from the exit of try main block to each catch clause.
+                    // This edge makes the remaining part of try main block, e.g., following `when` branches, marked as dead.
+                    tryMainExitNodes.top()
                 }
             }
             // (3)... within finally.

compiler/testData/codegen/boxInline/complexStack/spillConstructorArgumentsAndInlineLambdaParameter.kt

@@ -1,3 +1,4 @@
+// IGNORE_FIR_DIAGNOSTICS
 // FILE: 1.kt
 class A(val s: String)
 

compiler/testData/diagnostics/tests/initializedAfterRethrow.fir.kt

@@ -0,0 +1,222 @@
+fun foo(): Int = 42
+
+object ThrowInTryWithCatch {
+    private val p: String
+
+    init {
+        try {
+            throw Exception()
+        } catch (e: Exception) {
+        }
+        p = "OK"
+    }
+}
+
+object ThrowInTryWithCatchAndFinally {
+    private val p: String
+
+    init {
+        try {
+            throw Exception()
+        } catch (e: Exception) {
+        } finally {
+        }
+        p = "OK"
+    }
+}
+
+object ThrowInFinally {
+    <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>private val p: String<!>
+
+    init {
+        try {
+            foo()
+        } catch (e: Exception) {
+        } finally {
+            throw Exception()
+        }
+        p = "OK"
+    }
+}
+
+object RethrowInCatch {
+    private val p: String
+
+    init {
+        try {
+            foo()
+        } catch (e: Exception) {
+            throw e
+        }
+        p = "OK"
+    }
+}
+
+object RethrowInCatchWithFinally {
+    private val p: String
+
+    init {
+        try {
+            foo()
+        } catch (e: Exception) {
+            throw e
+        } finally {
+        }
+        p = "OK"
+    }
+}
+
+object InnerTryWithCatch {
+    <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>private val p: String<!>
+
+    init {
+        try {
+            foo()
+        } catch (e: Exception) {
+            try {
+                throw e
+            } catch (ee: Exception) {
+            }
+        }
+        p = "OK"
+    }
+}
+
+object InnerTryWithFinally {
+    private val p: String
+
+    init {
+        try {
+            foo()
+        } catch (e: Exception) {
+            try {
+                throw e
+            } finally {
+            }
+        }
+        p = "OK"
+    }
+}
+
+
+object InnerTryWithCatchAndFinally {
+    private val p: String
+
+    init {
+        try {
+            foo()
+        } catch (e: Exception) {
+            try {
+                throw e
+            } catch (ee: Exception) {
+            } finally {
+            }
+        }
+        p = "OK"
+    }
+}
+
+object InnerCatch {
+    private val p: String
+
+    init {
+        try {
+            foo()
+        } catch (e: Exception) {
+            try {
+                foo()
+            } catch (ee: Exception) {
+                throw ee
+            }
+        }
+        p = "OK"
+    }
+}
+
+object InnerCatchWithFinally {
+    private val p: String
+
+    init {
+        try {
+            foo()
+        } catch (e: Exception) {
+            try {
+                foo()
+            } catch (ee: Exception) {
+                throw ee
+            } finally {
+            }
+        }
+        p = "OK"
+    }
+}
+
+object InnerCatchOuterRethrow {
+    private val p: String
+
+    init {
+        try {
+            foo()
+        } catch (e: Exception) {
+            try {
+                foo()
+            } catch (ee: Exception) {
+                throw e
+            }
+        }
+        p = "OK"
+    }
+}
+
+object InnerCatchOuterRethrowWithFinally {
+    private val p: String
+
+    init {
+        try {
+            foo()
+        } catch (e: Exception) {
+            try {
+                foo()
+            } catch (ee: Exception) {
+                throw e
+            } finally {
+            }
+        }
+        p = "OK"
+    }
+}
+
+object InnerFinally {
+    private val p: String
+
+    init {
+        try {
+            foo()
+        } catch (e: Exception) {
+            try {
+                foo()
+            } finally {
+                throw e
+            }
+        }
+        p = "OK"
+    }
+}
+
+object InnerFinallyWithCatch {
+    private val p: String
+
+    init {
+        try {
+            foo()
+        } catch (e: Exception) {
+            try {
+                foo()
+            } catch (ee: Exception) {
+            } finally {
+                throw e
+            }
+        }
+        p = "OK"
+    }
+}

compiler/testData/diagnostics/tests/initializedAfterRethrow.kt

@@ -1,4 +1,3 @@
-// FIR_IDENTICAL
 fun foo(): Int = 42
 
 object ThrowInTryWithCatch {

compiler/testData/diagnostics/tests/smartCasts/throwInTry.fir.kt

@@ -40,7 +40,7 @@ fun conditionalThrowInTry_smartcastInTry(a: A) {
         if (a !is B) {
             throw AssertionError()
         }
-        <!INAPPLICABLE_CANDIDATE!>takeB<!>(a)
+        takeB(a)
     } catch (e: Throwable) {}
 }