8336489: Track scoped accesses in JVMCI compiled code

src/hotspot/share/jvmci/jvmciCodeInstaller.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2024, 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
@@ -722,13 +722,15 @@ JVMCI::CodeInstallResult CodeInstaller::install(JVMCICompiler* compiler,
   jint entry_bci = -1;
   JVMCICompileState* compile_state = nullptr;
   bool has_unsafe_access = false;
+  bool has_scoped_access = false;
   jint id = -1;
 
   if (is_nmethod) {
     method = methodHandle(thread, stream->read_method("method"));
     entry_bci = is_nmethod ? stream->read_s4("entryBCI") : -1;
     compile_state = (JVMCICompileState*) stream->read_u8("compileState");
     has_unsafe_access = stream->read_bool("hasUnsafeAccess");
+    has_scoped_access = stream->read_bool("hasScopedAccess");
     id = stream->read_s4("id");
   }
   stream->set_code_desc(name, method);
@@ -795,6 +797,7 @@ JVMCI::CodeInstallResult CodeInstaller::install(JVMCICompiler* compiler,
                                         id,
                                         _has_monitors,
                                         has_unsafe_access,
+                                        has_scoped_access,
                                         _has_wide_vector,
                                         compiled_code,
                                         mirror,

src/hotspot/share/jvmci/jvmciRuntime.cpp

@@ -2078,6 +2078,7 @@ JVMCI::CodeInstallResult JVMCIRuntime::register_method(JVMCIEnv* JVMCIENV,
                                                        int compile_id,
                                                        bool has_monitors,
                                                        bool has_unsafe_access,
+                                                       bool has_scoped_access,
                                                        bool has_wide_vector,
                                                        JVMCIObject compiled_code,
                                                        JVMCIObject nmethod_mirror,
@@ -2183,7 +2184,7 @@ JVMCI::CodeInstallResult JVMCIRuntime::register_method(JVMCIEnv* JVMCIENV,
         nm->set_has_unsafe_access(has_unsafe_access);
         nm->set_has_wide_vectors(has_wide_vector);
         nm->set_has_monitors(has_monitors);
-        nm->set_has_scoped_access(true); // conservative
+        nm->set_has_scoped_access(has_scoped_access);
 
         JVMCINMethodData* data = nm->jvmci_nmethod_data();
         assert(data != nullptr, "must be");

src/hotspot/share/jvmci/jvmciRuntime.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2024, 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
@@ -452,6 +452,7 @@ class JVMCIRuntime: public CHeapObj<mtJVMCI> {
                                            int                       compile_id,
                                            bool                      has_monitors,
                                            bool                      has_unsafe_access,
+                                           bool                      has_scoped_access,
                                            bool                      has_wide_vector,
                                            JVMCIObject               compiled_code,
                                            JVMCIObject               nmethod_mirror,

src/hotspot/share/jvmci/vmStructs_jvmci.cpp

@@ -655,6 +655,7 @@
   declare_constant(ConstMethodFlags::_misc_intrinsic_candidate)           \
   declare_constant(ConstMethodFlags::_misc_reserved_stack_access)         \
   declare_constant(ConstMethodFlags::_misc_changes_current_thread)        \
+  declare_constant(ConstMethodFlags::_misc_is_scoped)                     \
                                                                           \
   declare_constant(CounterData::count_off)                                \
                                                                           \

src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotCompiledCodeStream.java

@@ -563,6 +563,7 @@ private String codeDesc() {
             writeInt("entryBCI", nmethod.entryBCI);
             writeLong("compileState", nmethod.compileState);
             writeBoolean("hasUnsafeAccess", nmethod.hasUnsafeAccess);
+            writeBoolean("hasScopedAccess", nmethod.hasScopedAccess());
             writeInt("id", nmethod.id);
         }
 

src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotCompiledNmethod.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2024, 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
@@ -100,4 +100,22 @@ public String toString() {
     public String getInstallationFailureMessage() {
         return installationFailureMessage;
     }
+
+    /**
+     * Determines if {@code methods} contains at least one entry for which {@code HotSpotResolvedJavaMethod.isScoped()} returns true.
+     */
+    public boolean hasScopedAccess() {
+        if (methods == null) {
+            return false;
+        }
+        for (ResolvedJavaMethod method : methods) {
+            if (method instanceof HotSpotResolvedJavaMethod hotSpotMethod) {
+                if (hotSpotMethod.isScoped()) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
 }

src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedJavaMethodImpl.java

@@ -170,7 +170,7 @@ public int hashCode() {
      * @return flags of this method
      */
     private int getFlags() {
-        return UNSAFE.getShort(getMethodPointer() + config().methodFlagsOffset);
+        return UNSAFE.getInt(getMethodPointer() + config().methodFlagsOffset);
     }
 
     /**
@@ -179,7 +179,7 @@ private int getFlags() {
      * @return flags of this method's ConstMethod
      */
     private int getConstMethodFlags() {
-        return UNSAFE.getChar(getConstMethod() + config().constMethodFlagsOffset);
+        return UNSAFE.getInt(getConstMethod() + config().constMethodFlagsOffset);
     }
 
     @Override
@@ -324,6 +324,17 @@ public boolean hasReservedStackAccess() {
         return (getConstMethodFlags() & config().constMethodFlagsReservedStackAccess) != 0;
     }
 
+    /**
+     * Returns true if this method has a
+     * {@code jdk.internal.misc.ScopedMemoryAccess.Scoped} annotation.
+     *
+     * @return true if Scoped annotation present, false otherwise
+     */
+    @Override
+    public boolean isScoped() {
+        return (getConstMethodFlags() & config().constMethodFlagsIsScoped) != 0;
+    }
+
     /**
      * Sets flags on {@code method} indicating that it should never be inlined or compiled by the
      * VM.

src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotVMConfig.java

@@ -194,6 +194,7 @@ long prototypeMarkWord() {
     final int constMethodFlagsReservedStackAccess = getConstant("ConstMethodFlags::_misc_reserved_stack_access", Integer.class);
     final int constMethodFlagsCallerSensitive = getConstant("ConstMethodFlags::_misc_caller_sensitive", Integer.class);
     final int constMethodFlagsIntrinsicCandidate = getConstant("ConstMethodFlags::_misc_intrinsic_candidate", Integer.class);
+    final int constMethodFlagsIsScoped = getConstant("ConstMethodFlags::_misc_is_scoped", Integer.class);
     final int constMethodHasLineNumberTable = getConstant("ConstMethodFlags::_misc_has_linenumber_table", Integer.class);
     final int constMethodHasLocalVariableTable = getConstant("ConstMethodFlags::_misc_has_localvariable_table", Integer.class);
     final int constMethodHasMethodAnnotations = getConstant("ConstMethodFlags::_misc_has_method_annotations", Integer.class);

src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/meta/ResolvedJavaMethod.java

@@ -463,6 +463,16 @@ default boolean isJavaLangObjectInit() {
         return getDeclaringClass().isJavaLangObject() && getName().equals("<init>");
     }
 
+    /**
+     * Returns true if this method has a
+     * {@code jdk.internal.misc.ScopedMemoryAccess.Scoped} annotation.
+     *
+     * @return true if Scoped annotation present, false otherwise.
+     */
+    default boolean isScoped() {
+        throw new UnsupportedOperationException();
+    }
+
     /**
      * Gets a speculation log that can be used when compiling this method to make new speculations
      * and query previously failed speculations. The implementation may return a new

test/hotspot/jtreg/compiler/jvmci/jdk.vm.ci.runtime.test/src/jdk/vm/ci/runtime/test/TestResolvedJavaMethod.java

@@ -475,6 +475,24 @@ public void isJavaLangObjectInitTest() throws NoSuchMethodException {
         }
     }
 
+    @Test
+    public void isScopedTest() throws NoSuchMethodException, ClassNotFoundException {
+        // Must use reflection as ScopedMemoryAccess$Scoped is package-private
+        Class<? extends Annotation> scopedAnnotationClass = Class.forName("jdk.internal.misc.ScopedMemoryAccess$Scoped").asSubclass(Annotation.class);
+        boolean scopedMethodFound = false;
+        for (Map.Entry<Method, ResolvedJavaMethod> e : methods.entrySet()) {
+            ResolvedJavaMethod m = e.getValue();
+            Method key = e.getKey();
+            boolean expect = key.isAnnotationPresent(scopedAnnotationClass);
+            boolean actual = m.isScoped();
+            assertEquals(m.toString(), expect, actual);
+            if (expect) {
+                scopedMethodFound = true;
+            }
+        }
+        assertTrue("At least one scoped method must be present", scopedMethodFound);
+    }
+
     abstract static class UnlinkedType {
         abstract void abstractMethod();
 

test/hotspot/jtreg/compiler/jvmci/jdk.vm.ci.runtime.test/src/jdk/vm/ci/runtime/test/TypeUniverse.java

@@ -51,6 +51,7 @@
 import org.junit.Test;
 
 import jdk.internal.misc.Unsafe;
+import jdk.internal.misc.ScopedMemoryAccess;
 import jdk.vm.ci.meta.ConstantReflectionProvider;
 import jdk.vm.ci.meta.JavaConstant;
 import jdk.vm.ci.meta.MetaAccessProvider;
@@ -115,7 +116,7 @@ protected class ProtectedInnerClass {
                         byte[][].class, short[][].class, char[][].class, int[][].class, float[][].class, long[][].class, double[][].class, Object[][].class, Class[][].class, List[][].class,
                         ClassLoader.class, String.class, Serializable.class, Cloneable.class, Test.class, TestMetaAccessProvider.class, List.class, Collection.class, Map.class, Queue.class,
                         HashMap.class, LinkedHashMap.class, IdentityHashMap.class, AbstractCollection.class, AbstractList.class, ArrayList.class, InnerClass.class, InnerStaticClass.class,
-                        InnerStaticFinalClass.class, PrivateInnerClass.class, ProtectedInnerClass.class};
+                        InnerStaticFinalClass.class, PrivateInnerClass.class, ProtectedInnerClass.class, ScopedMemoryAccess.class};
         for (Class<?> c : initialClasses) {
             addClass(c);
         }