Create lambda names format consistent with the JDK lambda names format.

Author: sstanoje

compiler/src/jdk.graal.compiler.test/src/jdk/graal/compiler/hotspot/test/LambdaStableNameTest.java

@@ -69,20 +69,20 @@ public void checkStableLamdaNameForRunnableAndAutoCloseable() {
         assertEquals("Both stable lambda names are the same as they reference the same method", name, acName);
 
         String myName = Type.getInternalName(getClass());
-        assertEquals("The name known in 19.3 version is computed", "L" + myName + "$$Lambda$0a7a1b7da3e20b4eff3f548c6ba3e47a0c3be612;", name);
+        assertEquals("The name known in 24.0 version is computed", "L" + myName + "$$Lambda.0x0a7a1b7da3e20b4eff3f548c6ba3e47a0c3be612;", name);
     }
 
     private static void assertLambdaName(String name) {
         String expectedPrefix = "L" + LambdaStableNameTest.class.getCanonicalName().replace('.', '/') +
-                        "$$Lambda$";
+                        LambdaUtils.LAMBDA_CLASS_NAME_SUBSTRING;
         if (!name.startsWith(expectedPrefix)) {
             fail("Expecting " + expectedPrefix + " as prefix in lambda class name: " + name);
         }
         assertTrue("semicolon at the end", name.endsWith(";"));
 
-        int last = name.lastIndexOf('$');
+        int index = name.indexOf(LambdaUtils.ADDRESS_PREFIX);
 
-        String hash = name.substring(last + 1, name.length() - 1);
+        String hash = name.substring(index + LambdaUtils.ADDRESS_PREFIX.length(), name.length() - 1);
 
         BigInteger aValue = new BigInteger(hash, 16);
         assertNotNull("Hash can be parsed as a hex number: " + hash, aValue);

compiler/src/jdk.graal.compiler/src/jdk/graal/compiler/java/LambdaUtils.java

@@ -60,6 +60,7 @@ public final class LambdaUtils {
     public static final String LAMBDA_CLASS_NAME_SUBSTRING = "$$Lambda";
     public static final String SERIALIZATION_TEST_LAMBDA_CLASS_SUBSTRING = "$$Lambda";
     public static final String SERIALIZATION_TEST_LAMBDA_CLASS_SPLIT_PATTERN = "\\$\\$Lambda";
+    public static final String ADDRESS_PREFIX = ".0x";
 
     private static GraphBuilderConfiguration buildLambdaParserConfig(ClassInitializationPlugin cip) {
         GraphBuilderConfiguration.Plugins plugins = new GraphBuilderConfiguration.Plugins(new InvocationPlugins());
@@ -141,7 +142,7 @@ private static String createStableLambdaName(ResolvedJavaType lambdaType, List<R
         Matcher m = lambdaMatcher(lambdaName);
         StringBuilder sb = new StringBuilder();
         targetMethods.forEach((targetMethod) -> sb.append(targetMethod.format("%H.%n(%P)%R")));
-        return m.replaceFirst(Matcher.quoteReplacement("$$Lambda$" + digest(sb.toString()) + ";"));
+        return m.replaceFirst(Matcher.quoteReplacement(LAMBDA_CLASS_NAME_SUBSTRING + ADDRESS_PREFIX + digest(sb.toString()) + ";"));
     }
 
     private static Matcher lambdaMatcher(String value) {

substratevm/CHANGELOG.md

@@ -11,6 +11,7 @@ This changelog summarizes major changes to GraalVM Native Image.
 * (GR-48579) Options ParseOnce, ParseOnceJIT, and InlineBeforeAnalysis are deprecated and no longer have any effect.
 * (GR-39407) Add support for the `NATIVE_IMAGE_OPTIONS` environment variable, which allows users and tools to pass additional arguments via the environment. Similar to `JAVA_TOOL_OPTIONS`, the value of the environment variable is prepended to the options supplied to `native-image`.
 * (GR-20827): Introduce a dedicated caller-saved branch target register for software CFI implementations.
+* (GR-47937) Make the lambda-class name format in Native-Image consistent with the JDK name format.
 
 ## GraalVM for JDK 21 (Internal Version 23.1.0)
 * (GR-35746) Lower the default aligned chunk size from 1 MB to 512 KB for the serial and epsilon GCs, reducing memory usage and image size in many cases.

substratevm/mx.substratevm/testhello.py

@@ -900,7 +900,7 @@ def test():
     checker.check(exec_string, skip_fails=False)
     exec_string = execute("backtrace 3")
     rexp = [r"#0%shello\.Hello::lambda\$(static\$)?0%s %s at hello/Hello\.java:210"%(spaces_pattern, no_param_types_pattern, no_arg_values_pattern),
-            r"#1%s%s in hello\.Hello\$\$Lambda\$(%s/0x)?%s::get%s at hello/Hello\.java:238"%(spaces_pattern, address_pattern, digits_pattern, hex_digits_pattern, wildcard_pattern),
+            r"#1%s%s in hello\.Hello\$\$Lambda((\$%s/0x)|(\$)|(\.0x|/0x))?%s::get%s at hello/Hello\.java:238"%(spaces_pattern, address_pattern, digits_pattern, hex_digits_pattern, wildcard_pattern),
             r"#2%shello\.Hello::main%s %s at hello/Hello\.java:238"%(spaces_pattern, param_types_pattern, arg_values_pattern)]
     checker = Checker('backtrace in lambda', rexp)
     checker.check(exec_string, skip_fails=False)

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/lambda/LambdaProxyRenamingSubstitutionProcessor.java

@@ -45,12 +45,13 @@
 /**
  * This substitution replaces all lambda proxy types with types that have a stable names. The name
  * is formed from the signature of the target method that the lambda is calling.
- *
+ * <p>
  * NOTE: there is a particular case in which names are not stable. If multiple lambda proxies have a
  * same target in a same class they are indistinguishable in bytecode. Then their stable names get
  * appended with a unique number for that class. To make this corner case truly stable, analysis
  * must be run in the single-threaded mode.
  */
+
 public class LambdaProxyRenamingSubstitutionProcessor extends SubstitutionProcessor {
 
     private final BigBang bb;
@@ -66,7 +67,7 @@ public class LambdaProxyRenamingSubstitutionProcessor extends SubstitutionProces
 
     @Override
     public ResolvedJavaType lookup(ResolvedJavaType type) {
-        if (LambdaUtils.isLambdaType(type)) {
+        if (LambdaUtils.isLambdaType(type) && !type.getClass().equals(LambdaSubstitutionType.class)) {
             return getSubstitution(type);
         } else {
             return type;
@@ -100,14 +101,16 @@ private LambdaSubstitutionType getSubstitution(ResolvedJavaType original) {
      */
     private String findUniqueLambdaProxyName(String lambdaTargetName) {
         synchronized (uniqueLambdaProxyNames) {
-            String newStableName = lambdaTargetName;
-            CharSequence stableNameBase = lambdaTargetName.subSequence(0, lambdaTargetName.length() - 1);
+            String stableNameBase = lambdaTargetName.substring(0, lambdaTargetName.length() - 1);
+            String newStableName = stableNameBase + "0;";
+
             int i = 1;
             while (uniqueLambdaProxyNames.contains(newStableName)) {
-                newStableName = stableNameBase + "_" + i + ";";
+                newStableName = stableNameBase + i + ";";
                 i += 1;
             }
             uniqueLambdaProxyNames.add(newStableName);
+
             return newStableName;
         }
     }

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/lambda/StableLambdaProxyNameFeature.java

@@ -60,7 +60,7 @@ private static boolean checkLambdaNames(List<AnalysisType> types) {
             throw new AssertionError("Expensive check: should only run with assertions enabled.");
         }
         /* There should be no random lambda names visible to the analysis. */
-        if (types.stream().anyMatch(LambdaUtils::isLambdaType)) {
+        if (types.stream().anyMatch(type -> LambdaUtils.isLambdaType(type) && type.getWrapped().getClass() != LambdaSubstitutionType.class)) {
             throw new AssertionError("All lambda proxies should be substituted.");
         }
 

truffle/src/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/polyglot/HostObjectToStringTest.java

@@ -40,10 +40,7 @@
  */
 package com.oracle.truffle.api.test.polyglot;
 
-import static org.hamcrest.CoreMatchers.containsString;
-import static org.hamcrest.CoreMatchers.not;
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 
 import java.lang.reflect.InvocationHandler;
@@ -108,16 +105,13 @@ public void explicitToStringAccess() {
     @Test
     public void lambdaToString() {
         // HotSpot lambda classes have names like "pkg.HostClass$$Lambda$69/0x<hex-id>".
-        // We strip the "/0x<hex-id>" suffix from the name.
-        // On SVM, they are named "pkg.HostClass$$Lambda$<unique-hex-digest>", which we preserve.
+        // On SVM, they are named "pkg.HostClass$$Lambda$/0x<unique-hex-digest>", which we preserve.
         final Pattern allowedClassNamePattern = Pattern.compile("^[A-Za-z.$\\d]+$");
         final Supplier<String> supplier = () -> "ignored";
 
         setupEnv(HostAccess.EXPLICIT);
         Value value = context.asValue(supplier);
         String string = value.toString();
-        assertThat(string, not(containsString("/")));
-        assertThat(string, not(containsString("0x")));
         assertTrue(string, allowedClassNamePattern.matcher(string).matches());
     }