From 146c0fa1d45690a787b512d2ab1d9e0da9ec918a Mon Sep 17 00:00:00 2001
Subject: 8313626: C2 crash due to unexpected exception control flow
---
 src/hotspot/share/opto/doCall.cpp             |   4 +
 .../parsing/MissingSafepointOnTryCatch.jasm   | 111 ++++++++++++++++++
 .../TestMissingSafepointOnTryCatch.java       |  65 ++++++++++
 3 files changed, 180 insertions(+)
 create mode 100644 test/hotspot/jtreg/compiler/parsing/MissingSafepointOnTryCatch.jasm
 create mode 100644 test/hotspot/jtreg/compiler/parsing/TestMissingSafepointOnTryCatch.java

diff --git a/src/hotspot/share/opto/doCall.cpp b/src/hotspot/share/opto/doCall.cpp
index d42f9367d..ed0d14348 100644
--- a/src/hotspot/share/opto/doCall.cpp
+++ b/src/hotspot/share/opto/doCall.cpp
@@ -979,6 +979,8 @@ void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
       if (PrintOpto && WizardMode) {
         tty->print_cr("  Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
       }
+      // If this is a backwards branch in the bytecodes, add safepoint
+      maybe_add_safepoint(handler_bci);
       merge_exception(handler_bci); // jump to handler
       return;                   // No more handling to be done here!
     }
@@ -1010,6 +1012,8 @@ void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
         klass->print_name();
         tty->cr();
       }
+      // If this is a backwards branch in the bytecodes, add safepoint
+      maybe_add_safepoint(handler_bci);
       merge_exception(handler_bci);
     }
     set_control(not_subtype_ctrl);
diff --git a/test/hotspot/jtreg/compiler/parsing/MissingSafepointOnTryCatch.jasm b/test/hotspot/jtreg/compiler/parsing/MissingSafepointOnTryCatch.jasm
new file mode 100644
index 000000000..5d5fced0c
--- /dev/null
+++ b/test/hotspot/jtreg/compiler/parsing/MissingSafepointOnTryCatch.jasm
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+public class MissingSafepointOnTryCatch version 52:0 {
+
+    static Method m:"()V" {
+        return;
+    }
+
+    static Method test1:"()V" stack 1 {
+        try t;
+            invokestatic m:"()V";
+            return;
+
+            catch t java/lang/Throwable;
+            stack_map class java/lang/Throwable;
+            athrow;
+        endtry t;
+    }
+
+    static Method test2:"()V" stack 1 {
+        try t0;
+            try t1;
+                invokestatic m:"()V";
+            endtry t1;
+            return;
+
+            catch t1 java/lang/Exception;
+            stack_map class java/lang/Exception;
+            return;
+
+            catch t0 java/lang/Throwable;
+            stack_map class java/lang/Throwable;
+            athrow;
+        endtry t0;
+    }
+
+    public static Method th:"()V"
+      throws java/lang/Exception
+      stack 2 locals 0
+    {
+          new	class java/lang/Exception;
+          dup;
+          invokespecial	Method java/lang/Exception."<init>":"()V";
+          athrow;
+    }
+
+    static Method test3:"()V" stack 1 locals 2 {
+        try t;
+            invokestatic m:"()V";
+            iconst_1;
+            istore_0;
+    		iconst_0;
+    		istore_1;
+            return;
+            catch t java/lang/Throwable;
+            stack_map class java/lang/Throwable;
+            invokestatic th:"()V";
+            return;
+        endtry t;
+    }
+
+    static Method test4:"()V" stack 2 locals 2 {
+        try t;
+            invokestatic m:"()V";
+            iconst_1;
+            istore_0;
+            iconst_0;
+            istore_1;
+            return;
+            catch t java/lang/Throwable;
+            stack_map class java/lang/Throwable;
+            iconst_1;
+            istore_0;
+            invokestatic th:"()V";
+            return;
+        endtry t;
+    }
+
+    static Method testInfinite:"()V" stack 1 {
+        try t;
+            invokestatic th:"()V";
+            return;
+
+            catch t java/lang/Throwable;
+            stack_map class java/lang/Throwable;
+            athrow;
+        endtry t;
+    }
+
+} // end Class MissingSafepointOnTryCatch
diff --git a/test/hotspot/jtreg/compiler/parsing/TestMissingSafepointOnTryCatch.java b/test/hotspot/jtreg/compiler/parsing/TestMissingSafepointOnTryCatch.java
new file mode 100644
index 000000000..9a8a31357
--- /dev/null
+++ b/test/hotspot/jtreg/compiler/parsing/TestMissingSafepointOnTryCatch.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8313626
+ * @summary  assert(false) failed: malformed control flow to missing safepoint on backedge of a try-catch
+ * @library /test/lib
+ * @compile MissingSafepointOnTryCatch.jasm
+ * @run main/othervm -XX:CompileCommand=quiet
+ *      -XX:CompileCommand=compileonly,MissingSafepointOnTryCatch::test*
+ *      -XX:CompileCommand=dontinline,MissingSafepointOnTryCatch::m
+ *      -XX:CompileCommand=inline,MissingSafepointOnTryCatch::th
+ *      -XX:-TieredCompilation -Xcomp TestMissingSafepointOnTryCatch
+ */
+
+import jdk.test.lib.Utils;
+
+public class TestMissingSafepointOnTryCatch {
+
+    public static void infiniteLoop() {
+        try {
+            Thread thread = new Thread() {
+                public void run() {
+                    MissingSafepointOnTryCatch.testInfinite();
+                }
+            };
+            thread.setDaemon(true);
+            thread.start();
+            Thread.sleep(Utils.adjustTimeout(500));
+        } catch (Exception e) {}
+    }
+
+    public static void main(String[] args) {
+        try {
+            // to make sure java/lang/Exception class is resolved
+            MissingSafepointOnTryCatch.th();
+        } catch (Exception e) {}
+        MissingSafepointOnTryCatch.test1();
+        MissingSafepointOnTryCatch.test2();
+        MissingSafepointOnTryCatch.test3();
+        MissingSafepointOnTryCatch.test4();
+        infiniteLoop();
+    }
+}
-- 
2.22.0

