From 766f62a1b39211fe6819d3ec77e3bc28d4ed793c Mon Sep 17 00:00:00 2001
From: Rico Tzschichholz <ricotz@ubuntu.com>
Date: Fri, 4 Feb 2022 09:32:11 +0100
Subject: [PATCH] vala: Make sure to drop our "trap" jump target in case of an
 error

Otherwise this can result in an infinite loop in FlowAnalyzer.intersect()

Improve source reference for jump out of finally block

Fixes https://gitlab.gnome.org/GNOME/vala/issues/1287
---
 tests/Makefile.am                             |  1 +
 .../switch-try-finally-throw.test             | 24 +++++++++++++++++++
 vala/valaflowanalyzer.vala                    |  5 ++--
 3 files changed, 28 insertions(+), 2 deletions(-)
 create mode 100644 tests/control-flow/switch-try-finally-throw.test

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 82cde888e..70447ab67 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -291,6 +291,7 @@ TESTS = \
 	control-flow/switch.vala \
 	control-flow/switch-enum.vala \
 	control-flow/switch-string.vala \
+	control-flow/switch-try-finally-throw.test \
 	control-flow/sideeffects.vala \
 	control-flow/unassigned-captured-local-variable.test \
 	control-flow/unassigned-local-block-variable.test \
diff --git a/tests/control-flow/switch-try-finally-throw.test b/tests/control-flow/switch-try-finally-throw.test
new file mode 100644
index 000000000..1cf0ec796
--- /dev/null
+++ b/tests/control-flow/switch-try-finally-throw.test
@@ -0,0 +1,24 @@
+Invalid Code
+
+errordomain FooError {
+	FAIL
+}
+
+void foo () throws FooError {
+}
+
+void bar (int i) throws Error {
+	switch (i) {
+	case 23:
+		try {
+		} finally {
+			foo ();
+		}
+		break;
+	default:
+		throw new FooError.FAIL ("bar");
+	}
+}
+
+void main () {
+}
diff --git a/vala/valaflowanalyzer.vala b/vala/valaflowanalyzer.vala
index a5a8be993..9c9457fd5 100644
--- a/vala/valaflowanalyzer.vala
+++ b/vala/valaflowanalyzer.vala
@@ -1009,13 +1009,14 @@ public class Vala.FlowAnalyzer : CodeVisitor {
 
 			stmt.finally_body.accept (this);
 
+			jump_stack.remove_at (jump_stack.size - 1);
+
 			if (invalid_block.get_predecessors ().size > 0) {
 				// don't allow finally blocks with e.g. return statements
-				Report.error (stmt.source_reference, "jump out of finally block not permitted");
+				Report.error (stmt.finally_body.source_reference, "jump out of finally block not permitted");
 				stmt.error = true;
 				return;
 			}
-			jump_stack.remove_at (jump_stack.size - 1);
 
 			jump_stack.add (new JumpTarget.finally_clause (finally_block, current_block));
 		}
-- 
2.47.2