8357739: [jittester] disable the hashCode method

test/hotspot/jtreg/testlibrary/jittester/conf/exclude.methods.lst

@@ -31,3 +31,6 @@ java/lang/System::nanoTime()
 java/lang/annotation/IncompleteAnnotationException::IncompleteAnnotationException(Ljava/lang/Class;Ljava/lang/String;)
 java/util/AbstractSet::toString()
 java/util/HashSet::toString()
+
+#Unstable methods
+*::hashCode

test/hotspot/jtreg/testlibrary/jittester/src/jdk/test/lib/jittester/MethodTemplate.java

@@ -0,0 +1,256 @@
+/*
+ * Copyright (c) 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.
+ */
+
+package testlibrary.jittester.src.jdk.test.lib.jittester;
+
+import java.io.IOException;
+import java.io.StringReader;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Executable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.List;
+import java.util.Optional;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import jdk.test.lib.Asserts;
+
+import static java.util.function.Predicate.not;
+
+
+/**
+ * A wrapper for string method templates, similar to the CompileCommand patterns.
+ */
+public final class MethodTemplate {
+
+    /**
+     * String that can have wildcard symbols on its ends, allowing it to match a family of strings.
+     * For example, "abc*" matches "abc123", and so on.
+     */
+    public static class WildcardString {
+        private final String pattern;
+        private final boolean frontWildcarded;
+        private final boolean tailWildcarded;
+
+        /**
+         * Creates a WildcardString from given string.
+         * @param pattern   string pattern, like "some*"
+         */
+        public WildcardString(String pattern) {
+            // check for the leading '*'
+            frontWildcarded = pattern.charAt(0) == '*';
+            pattern = frontWildcarded ? pattern.substring(1) : pattern;
+
+            // check for the trailing '*'
+            tailWildcarded = pattern.length() > 0 && pattern.charAt(pattern.length() - 1) == '*';
+            pattern = tailWildcarded ? pattern.substring(0, pattern.length() - 1) : pattern;
+
+            this.pattern = pattern;
+        }
+
+        /**
+         * Returns true it this WildcardString matches given other string.
+         * @param other the string that this WildcardString should be matched against
+         * @return      true in case of a match.
+         */
+        public boolean matches(String other) {
+            boolean result = pattern.equals(other);
+            result |= frontWildcarded ? other.endsWith(pattern) : result;
+            result |= tailWildcarded ? other.startsWith(pattern) : result;
+            result |= tailWildcarded && frontWildcarded ? other.contains(pattern) : result;
+            return result;
+        }
+    }
+
+    private static final Pattern METHOD_PATTERN = Pattern.compile(generateMethodPattern());
+
+    private final WildcardString klassName;
+    private final WildcardString methodName;
+    private final Optional<List<Class<?>>> signature;
+
+    private MethodTemplate(String klassName, String methodName, Optional<List<Class<?>>> signature) {
+        this.klassName = new WildcardString(klassName);
+        this.methodName = new WildcardString(methodName);
+        this.signature = signature;
+    }
+
+    private static String generateMethodPattern() {
+        // Sample valid template(s):    java/lang/String::indexOf(Ljava/lang/String;I)
+        //                              java/lang/::*(Ljava/lang/String;I)
+        //                              *String::indexOf(*)
+        //                              java/lang/*::indexOf
+
+        String primitiveType = "[ZBSCIJFD]";        // Simply a letter, like 'I'
+        String referenceType = "L[\\w/$]+;";        // Like 'Ljava/lang/String;'
+        String primOrRefType =
+            "\\[?" + primitiveType +                // Bracket is optional: '[Z', or 'Z'
+            "|" +
+            "\\[?" + referenceType;                 // Bracket is optional: '[LSomeObject;' or 'LSomeObject;'
+        String argTypesOrWildcard = "(" +           // Method argument(s) Ljava/lang/String;Z...
+                "(" + primOrRefType + ")*" +
+            ")|\\*";                                // .. or a wildcard:
+
+        return
+            "(?<klassName>[\\w/$]*\\*?)" +          // Class name, like 'java/lang/String'
+            "::" +                                  // Simply '::'
+            "(?<methodName>\\*?[\\w$]+\\*?)" +      // method name, 'indexOf''
+            "(\\((?<argTypes>" +                    // Method argument(s) in brackets:
+                argTypesOrWildcard +                //     (Ljava/lang/String;Z) or '*' or nothing
+            ")\\))?";
+    }
+
+    /**
+     * Returns true iff none of the given MethodTemplates matches the given Executable.
+     *
+     * @param templates     the collection of templates to check
+     * @param method        the executable to match the colletions templates
+     * @return              true if none of the given templates matches the method, false otherwise
+     */
+    public static boolean noneMatches(Collection<MethodTemplate> templates, Executable method) {
+        for (MethodTemplate template : templates) {
+            if (template.matches(method)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Returns true if this MethodTemplate matches the given Executable.
+     *
+     * @param other     the Executable to try to match to
+     * @return          whether the other matches this MethodTemplate
+     */
+    public boolean matches(Executable other) {
+        boolean result = klassName.matches(other.getDeclaringClass().getName());
+
+        result &= (other instanceof Constructor)
+            ? result
+            : methodName.matches(other.getName());
+
+        return result &&
+            signature.map(Arrays.asList(other.getParameterTypes())::equals)
+                     .orElse(true);
+    }
+
+    /**
+     * Parses the given string and returs a MethodTemplate.
+     *
+     * @param methodStr     the string to parse
+     * @return              created MethodTemplate
+     */
+    public static MethodTemplate parse(String methodStr) {
+        Matcher matcher = METHOD_PATTERN.matcher(methodStr);
+        String msg = String.format("Format of the methods exclude input file is incorrect,"
+                + " methodStr \"%s\" has wrong format", methodStr);
+        Asserts.assertTrue(matcher.matches(), msg);
+
+        String klassName = matcher.group("klassName").replaceAll("/", "\\.");
+        String methodName = matcher.group("methodName");
+        Optional<List<Class<?>>> signature = Optional.ofNullable(matcher.group("argTypes"))
+                                                     .filter(not("*"::equals))
+                                                     .map(MethodTemplate::parseSignature);
+        return new MethodTemplate(klassName, methodName, signature);
+    }
+
+    private static List<Class<?>> parseSignature(String signature) {
+        List<Class<?>> sigClasses = new ArrayList<>();
+        char typeChar;
+        boolean isArray;
+        String klassName;
+        StringBuilder sb;
+        StringBuilder arrayDim;
+        try (StringReader str = new StringReader(signature)) {
+            int symbol = str.read();
+            while (symbol != -1) {
+                typeChar = (char) symbol;
+                arrayDim = new StringBuilder();
+                Class<?> primArrayClass = null;
+                if (typeChar == '[') {
+                    isArray = true;
+                    arrayDim.append('[');
+                    symbol = str.read();
+                    while (symbol == '[') {
+                        arrayDim.append('[');
+                        symbol = str.read();
+                    }
+                    typeChar = (char) symbol;
+                    if (typeChar != 'L') {
+                        primArrayClass = Class.forName(arrayDim.toString() + typeChar);
+                    }
+                } else {
+                    isArray = false;
+                }
+                switch (typeChar) {
+                    case 'Z':
+                        sigClasses.add(isArray ? primArrayClass : boolean.class);
+                        break;
+                    case 'I':
+                        sigClasses.add(isArray ? primArrayClass : int.class);
+                        break;
+                    case 'J':
+                        sigClasses.add(isArray ? primArrayClass : long.class);
+                        break;
+                    case 'F':
+                        sigClasses.add(isArray ? primArrayClass : float.class);
+                        break;
+                    case 'D':
+                        sigClasses.add(isArray ? primArrayClass : double.class);
+                        break;
+                    case 'B':
+                        sigClasses.add(isArray ? primArrayClass : byte.class);
+                        break;
+                    case 'S':
+                        sigClasses.add(isArray ? primArrayClass : short.class);
+                        break;
+                    case 'C':
+                        sigClasses.add(isArray ? primArrayClass : char.class);
+                        break;
+                    case 'L':
+                        sb = new StringBuilder();
+                        symbol = str.read();
+                        while (symbol != ';') {
+                            sb.append((char) symbol);
+                            symbol = str.read();
+                        }
+                        klassName = sb.toString().replaceAll("/", "\\.");
+                        if (isArray) {
+                            klassName = arrayDim.toString() + "L" + klassName + ";";
+                        }
+                        Class<?> klass = Class.forName(klassName);
+                        sigClasses.add(klass);
+                        break;
+                    default:
+                        throw new Error("Unknown type " + typeChar);
+                }
+                symbol = str.read();
+            }
+        } catch (IOException | ClassNotFoundException ex) {
+            throw new Error("Unexpected exception while parsing exclude methods file", ex);
+        }
+        return sigClasses;
+    }
+
+}