undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
2026-03-26 17:11:57 -04:00 · 2026-03-26 17:11:57 -04:00 · 0a580b313d
commit 0a580b313d
70422 changed files with 17213626 additions and 0 deletions
--- a/test/langtools/jdk/jshell/UnnamedTest.java
+++ b/test/langtools/jdk/jshell/UnnamedTest.java
@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2023, 2025, 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 8315851 8315588
+ * @summary Tests for unnamed variables
+ * @library /tools/lib
+ * @modules jdk.compiler/com.sun.tools.javac.api
+ *          jdk.compiler/com.sun.tools.javac.main
+ *          jdk.jshell
+ * @build Compiler KullaTesting TestingInputStream ExpectedDiagnostic
+ * @run junit UnnamedTest
+ */
+
+import java.util.function.Consumer;
+
+import jdk.jshell.SourceCodeAnalysis;
+import jdk.jshell.VarSnippet;
+
+import jdk.jshell.JShell;
+
+import static jdk.jshell.SourceCodeAnalysis.Completeness.COMPLETE;
+import static jdk.jshell.SourceCodeAnalysis.Completeness.DEFINITELY_INCOMPLETE;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class UnnamedTest extends KullaTesting {
+
+    @Test
+    public void unnamed() {
+        VarSnippet sn1 = varKey(assertEval("int _ = 0;"));
+        VarSnippet sn2 = varKey(assertEval("String _ = \"x\";"));
+        Assertions.assertEquals("0", getState().varValue(sn1));
+        Assertions.assertEquals("\"x\"", getState().varValue(sn2));
+    }
+
+    static final String[] definitely_incomplete = new String[]{
+            "int _ = ",
+            "int m(String v, int r) {\n" +
+                    "    try {\n" +
+                    "        return Integer.parseInt(v, r);\n" +
+                    "    } catch (NumberFormatException _) {",
+            "try (final Lock _ = ",
+            "try (Lock _ = null) {\n" +
+                "            try (Lock _ = null) {",
+            "for (var _ : strs",
+            "TwoParams p1 = (_, _) ->",
+            "for (int _ = 0, _ = 1, x = 1;",
+            "if (r instanceof R(_"
+    };
+
+    static final String[] complete = new String[]{
+            "int _ = 42;",
+            "int m(String v, int r) {\n" +
+                    "    try {\n" +
+                    "        return Integer.parseInt(v, r);\n" +
+                    "    } catch (NumberFormatException _) { } }",
+            "try (final Lock _ = TEST) {}",
+            "try (Lock _ = null) {\n" +
+                    "            try (Lock _ = null) { } }",
+            "for (var _ : strs) { }",
+            "TwoParams p1 = (_, _) -> {};",
+            "for (int _ = 0, _ = 1, x = 1; x <= 1 ; x++) {}",
+            "if (r instanceof R(_)) { }"
+    };
+
+    private void assertStatus(String input, SourceCodeAnalysis.Completeness status, String source) {
+        String augSrc;
+        switch (status) {
+            case COMPLETE_WITH_SEMI:
+                augSrc = source + ";";
+                break;
+
+            case DEFINITELY_INCOMPLETE:
+                augSrc = null;
+                break;
+
+            case CONSIDERED_INCOMPLETE:
+                augSrc = source + ";";
+                break;
+
+            case EMPTY:
+            case COMPLETE:
+            case UNKNOWN:
+                augSrc = source;
+                break;
+
+            default:
+                throw new AssertionError();
+        }
+        assertAnalyze(input, status, augSrc);
+    }
+
+    private void assertStatus(String[] ins, SourceCodeAnalysis.Completeness status) {
+        for (String input : ins) {
+            assertStatus(input, status, input);
+        }
+    }
+
+    @Test
+    public void test_definitely_incomplete() {
+        assertStatus(definitely_incomplete, DEFINITELY_INCOMPLETE);
+    }
+
+    @Test
+    public void test_definitely_complete() {
+        assertStatus(complete, COMPLETE);
+    }
+
+    @Override
+    public void setUp(Consumer<JShell.Builder> bc) {
+        super.setUp(bc.andThen(b -> b.compilerOptions("--enable-preview", "--source", System.getProperty("java.specification.version"))));
+    }
+}