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8380129: Remove AccessFlags::print_on in favor of context-specific printing #30746

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8380129: Remove AccessFlags::print_on in favor of context-specific printing #30746

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9ac3afc
removed accessflags::print_on and lifted to separate printers
caspernorrbin Apr 15, 2026
f471984
feedback fixes
caspernorrbin Apr 16, 2026
71b7c76
reorder private/public/protected in instanceklass
caspernorrbin Apr 17, 2026
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7 changes: 4 additions & 3 deletions src/hotspot/share/oops/instanceKlass.cpp
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Expand Up @@ -3702,18 +3702,19 @@ const char* InstanceKlass::init_state_name() const {
return state_names[init_state()];
}

#if !defined(PRODUCT) || INCLUDE_JVMTI
void InstanceKlass::print_class_flags(outputStream* st) const {
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@dholmes-ora dholmes-ora Apr 16, 2026

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This is incomplete. If the class is an inner class then additional access flags are possible (private, protected, static).
EDIT: Hmm jvm_constants.h does not recognise this either via JVM_RECOGNIZED_CLASS_MODIFIERS. Not sure how this should be handled.

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@dholmes-ora dholmes-ora Apr 16, 2026

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Also do we need to handle ACC_MODULE, or do we not actually create an instanceKlass for those?

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@liach liach Apr 16, 2026

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On jdk side we never have Class for modules. These classfiles are exclusively handled by Java code in ModuleDescriptor I think?

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@caspernorrbin caspernorrbin Apr 16, 2026

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I have now changed it to use compute_modifier_flags() instead of access_flags() directly. With this, we get member-class modifiers printed. I expanded the test which shows that private/protected static gets printed. This matches the class' modifiers, which feels like the correct behavior.

ACC_MODULE is not needed here because it never becomes an InstanceKlass. It is rejected as a normal class during parsing.

AccessFlags flags = access_flags();
AccessFlags flags(compute_modifier_flags());
if (flags.is_private ()) st->print("private ");
if (flags.is_protected ()) st->print("protected ");
if (flags.is_public ()) st->print("public ");
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@dholmes-ora dholmes-ora Apr 17, 2026

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Nit: use the same order as for fields and methods.

if (flags.is_static ()) st->print("static ");
if (flags.is_final ()) st->print("final ");
if (flags.is_interface ()) st->print("interface ");
if (flags.is_abstract ()) st->print("abstract ");
if (flags.is_annotation()) st->print("annotation ");
if (flags.is_enum ()) st->print("enum ");
if (flags.is_synthetic ()) st->print("synthetic ");
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@liach liach Apr 26, 2026

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The bit for SYNTHETIC, 0x1000, comes before ANNOTATION, 0x2000, and ENUM, 0x4000. That should be tracked in a separate issue though.

}
#endif // !defined(PRODUCT) || INCLUDE_JVMTI

void InstanceKlass::print_on(outputStream* st) const {
assert(is_klass(), "must be klass");
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4 changes: 0 additions & 4 deletions src/hotspot/share/oops/instanceKlass.hpp
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Expand Up @@ -1169,11 +1169,7 @@ class InstanceKlass: public Klass {
// Printing
void print_on(outputStream* st) const override;
void print_value_on(outputStream* st) const override;
#if !defined(PRODUCT) || INCLUDE_JVMTI
void print_class_flags(outputStream* st) const;
#else
void print_class_flags(outputStream* st) const PRODUCT_RETURN;
#endif

void oop_print_value_on(oop obj, outputStream* st) override;

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28 changes: 13 additions & 15 deletions src/hotspot/share/oops/method.cpp
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Expand Up @@ -2289,23 +2289,21 @@ void Method::print_linkage_flags(outputStream* st) const {
}
#endif //PRODUCT

#if !defined(PRODUCT) || INCLUDE_JVMTI
void Method::print_access_flags(outputStream* st) const {
AccessFlags flags = access_flags();
if (flags.is_public ()) st->print("public ");
if (flags.is_private ()) st->print("private ");
if (flags.is_protected ()) st->print("protected ");
if (flags.is_static ()) st->print("static ");
if (flags.is_final ()) st->print("final ");
if (flags.is_synchronized ()) st->print("synchronized ");
if (flags.is_bridge ()) st->print("bridge ");
if (flags.has_vararg ()) st->print("varargs ");
if (flags.is_native ()) st->print("native ");
if (flags.is_abstract ()) st->print("abstract ");
if (flags.is_strict_method()) st->print("strict ");
if (flags.is_synthetic ()) st->print("synthetic ");
}
#endif // !defined(PRODUCT) || INCLUDE_JVMTI
if (flags.is_public ()) st->print("public ");
if (flags.is_private ()) st->print("private ");
if (flags.is_protected ()) st->print("protected ");
if (flags.is_static ()) st->print("static ");
if (flags.is_final ()) st->print("final ");
if (flags.is_synchronized()) st->print("synchronized ");
if (flags.is_bridge ()) st->print("bridge ");
if (flags.is_varargs ()) st->print("varargs ");
if (flags.is_native ()) st->print("native ");
if (flags.is_abstract ()) st->print("abstract ");
if (flags.is_strictfp ()) st->print("strict ");
if (flags.is_synthetic ()) st->print("synthetic ");
}

void Method::print_value_on(outputStream* st) const {
assert(is_method(), "must be method");
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4 changes: 0 additions & 4 deletions src/hotspot/share/oops/method.hpp
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Expand Up @@ -859,11 +859,7 @@ class Method : public Metadata {
void print_on(outputStream* st) const;
#endif
void print_value_on(outputStream* st) const;
#if !defined(PRODUCT) || INCLUDE_JVMTI
void print_access_flags(outputStream* st) const;
#else
void print_access_flags(outputStream* st) const PRODUCT_RETURN;
#endif
void print_linkage_flags(outputStream* st) const PRODUCT_RETURN;

const char* internal_name() const { return "{method}"; }
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2 changes: 0 additions & 2 deletions src/hotspot/share/runtime/fieldDescriptor.cpp
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Expand Up @@ -108,7 +108,6 @@ void fieldDescriptor::reinitialize(InstanceKlass* ik, const FieldInfo& fieldinfo
guarantee(_fieldinfo.name_index() != 0 && _fieldinfo.signature_index() != 0, "bad constant pool index for fieldDescriptor");
}

#if !defined(PRODUCT) || INCLUDE_JVMTI
void fieldDescriptor::print_access_flags(outputStream* st) const {
AccessFlags flags = access_flags();
if (flags.is_public ()) st->print("public ");
Expand All @@ -121,7 +120,6 @@ void fieldDescriptor::print_access_flags(outputStream* st) const {
if (flags.is_enum ()) st->print("enum ");
if (flags.is_synthetic()) st->print("synthetic ");
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@liach liach Apr 26, 2026

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Same SYNTHETIC remark here.

}
#endif // !defined(PRODUCT) || INCLUDE_JVMTI

void fieldDescriptor::print_on(outputStream* st) const {
print_access_flags(st);
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4 changes: 0 additions & 4 deletions src/hotspot/share/runtime/fieldDescriptor.hpp
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Expand Up @@ -111,11 +111,7 @@ class fieldDescriptor {
void print() const;
void print_on(outputStream* st) const;
void print_on_for(outputStream* st, oop obj);
#if !defined(PRODUCT) || INCLUDE_JVMTI
void print_access_flags(outputStream* st) const;
#else
void print_access_flags(outputStream* st) const PRODUCT_RETURN;
#endif
};

#endif // SHARE_RUNTIME_FIELDDESCRIPTOR_HPP
4 changes: 2 additions & 2 deletions src/hotspot/share/utilities/accessFlags.hpp
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Expand Up @@ -55,13 +55,13 @@ class AccessFlags {
bool is_volatile () const { return (_flags & JVM_ACC_VOLATILE ) != 0; }
bool is_bridge () const { return (_flags & JVM_ACC_BRIDGE ) != 0; }
bool is_transient () const { return (_flags & JVM_ACC_TRANSIENT ) != 0; }
bool has_vararg () const { return (_flags & JVM_ACC_VARARGS ) != 0; }
bool is_varargs () const { return (_flags & JVM_ACC_VARARGS ) != 0; }
bool is_native () const { return (_flags & JVM_ACC_NATIVE ) != 0; }
bool is_enum () const { return (_flags & JVM_ACC_ENUM ) != 0; }
bool is_annotation () const { return (_flags & JVM_ACC_ANNOTATION ) != 0; }
bool is_interface () const { return (_flags & JVM_ACC_INTERFACE ) != 0; }
bool is_abstract () const { return (_flags & JVM_ACC_ABSTRACT ) != 0; }
bool is_strict_method() const { return (_flags & JVM_ACC_STRICT ) != 0; }
bool is_strictfp () const { return (_flags & JVM_ACC_STRICT ) != 0; }

// Attribute flags
bool is_synthetic () const { return (_flags & JVM_ACC_SYNTHETIC ) != 0; }
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16 changes: 15 additions & 1 deletion test/hotspot/gtest/oops/test_instanceKlass.cpp
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Expand Up @@ -95,7 +95,21 @@ TEST_VM(InstanceKlass, class_flag_printer) {
Klass* thread_state_klass = SystemDictionary::resolve_or_fail(thread_state_symbol, true, THREAD);
ASSERT_FALSE(THREAD->has_pending_exception()) << "java/lang/Thread$State must resolve";
InstanceKlass::cast(thread_state_klass)->print_class_flags(&st);
ASSERT_STREQ("public final enum ", st.base());
ASSERT_STREQ("public static final enum ", st.base());

st.reset();
Symbol* certificate_rep_symbol = SymbolTable::new_symbol("java/security/cert/Certificate$CertificateRep");
Klass* certificate_rep_klass = SystemDictionary::resolve_or_fail(certificate_rep_symbol, true, THREAD);
ASSERT_FALSE(THREAD->has_pending_exception()) << "java/security/cert/Certificate$CertificateRep must resolve";
InstanceKlass::cast(certificate_rep_klass)->print_class_flags(&st);
ASSERT_STREQ("protected static ", st.base());

st.reset();
Symbol* arrays_array_list_symbol = SymbolTable::new_symbol("java/util/Arrays$ArrayList");
Klass* arrays_array_list_klass = SystemDictionary::resolve_or_fail(arrays_array_list_symbol, true, THREAD);
ASSERT_FALSE(THREAD->has_pending_exception()) << "java/util/Arrays$ArrayList must resolve";
InstanceKlass::cast(arrays_array_list_klass)->print_class_flags(&st);
ASSERT_STREQ("private static ", st.base());
}

TEST_VM(FieldDescriptor, access_flag_printer) {
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