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Improve linkToVirtual() and linkToInterface() dispatch #17850

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Aug 14, 2023
Merged

Improve linkToVirtual() and linkToInterface() dispatch #17850

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8ce0584
Extract method to find or fabricate a shadow for MemberName.vmtarget
jdmpapin May 30, 2023
830016e
Improve linkToVirtual() and linkToInterface() dispatch
jdmpapin May 9, 2023
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6 changes: 4 additions & 2 deletions runtime/codert_vm/arm64nathelp.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -321,8 +321,10 @@ OLD_DUAL_MODE_HELPER_NO_RETURN_VALUE(jitPutFlattenableStaticField,3)
OLD_DUAL_MODE_HELPER(jitLoadFlattenableArrayElement,2)
OLD_DUAL_MODE_HELPER_NO_RETURN_VALUE(jitStoreFlattenableArrayElement,3)
SLOW_PATH_ONLY_HELPER_NO_RETURN_VALUE(jitResolveFlattenableField,3)
FAST_PATH_ONLY_HELPER(jitLookupDynamicInterfaceMethod,3)
OLD_DUAL_MODE_HELPER(jitLookupDynamicPublicInterfaceMethod,3)

ifdef({ASM_J9VM_OPT_OPENJDK_METHODHANDLE},{
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OLD_DUAL_MODE_HELPER(jitLookupDynamicPublicInterfaceMethod,2)
}) dnl ASM_J9VM_OPT_OPENJDK_METHODHANDLE

dnl Trap handlers

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6 changes: 4 additions & 2 deletions runtime/codert_vm/armnathelp.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -299,8 +299,10 @@ OLD_DUAL_MODE_HELPER_NO_RETURN_VALUE(jitPutFlattenableStaticField,3)
OLD_DUAL_MODE_HELPER(jitLoadFlattenableArrayElement,2)
OLD_DUAL_MODE_HELPER_NO_RETURN_VALUE(jitStoreFlattenableArrayElement,3)
SLOW_PATH_ONLY_HELPER_NO_RETURN_VALUE(jitResolveFlattenableField,3)
FAST_PATH_ONLY_HELPER(jitLookupDynamicInterfaceMethod,3)
OLD_DUAL_MODE_HELPER(jitLookupDynamicPublicInterfaceMethod,3)

ifdef({ASM_J9VM_OPT_OPENJDK_METHODHANDLE},{
OLD_DUAL_MODE_HELPER(jitLookupDynamicPublicInterfaceMethod,2)
}) dnl ASM_J9VM_OPT_OPENJDK_METHODHANDLE

dnl Trap handlers

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27 changes: 10 additions & 17 deletions runtime/codert_vm/cnathelp.cpp
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Expand Up @@ -1623,19 +1623,7 @@ old_fast_jitLookupInterfaceMethod(J9VMThread *currentThread)
return slowPath;
}

void J9FASTCALL
old_fast_jitLookupDynamicInterfaceMethod(J9VMThread *currentThread)
{
OLD_JIT_HELPER_PROLOGUE(3);
DECLARE_JIT_CLASS_PARM(receiverClass, 1);
DECLARE_JIT_CLASS_PARM(interfaceClass, 2);
DECLARE_JIT_PARM(UDATA, iTableIndex, 3);
UDATA iTableOffset = sizeof(struct J9ITable) + (iTableIndex * sizeof(UDATA));
UDATA vTableOffset = convertITableOffsetToVTableOffset(currentThread, receiverClass, interfaceClass, iTableOffset);
Assert_CodertVM_false(0 == vTableOffset);
JIT_RETURN_UDATA(vTableOffset);
}

#if defined(J9VM_OPT_OPENJDK_METHODHANDLE)
void* J9FASTCALL
old_slow_jitLookupDynamicPublicInterfaceMethod(J9VMThread *currentThread)
{
Expand All @@ -1651,10 +1639,13 @@ void* J9FASTCALL
old_fast_jitLookupDynamicPublicInterfaceMethod(J9VMThread *currentThread)
{
void *slowPath = (void*)old_slow_jitLookupDynamicPublicInterfaceMethod;
OLD_JIT_HELPER_PROLOGUE(3);
OLD_JIT_HELPER_PROLOGUE(2);
DECLARE_JIT_CLASS_PARM(receiverClass, 1);
DECLARE_JIT_CLASS_PARM(interfaceClass, 2);
DECLARE_JIT_PARM(UDATA, iTableIndex, 3);
DECLARE_JIT_PARM(j9object_t, memberName, 2);
J9JavaVM *vm = currentThread->javaVM;
J9Method *interfaceMethod = (J9Method *)(UDATA)J9OBJECT_U64_LOAD(currentThread, memberName, vm->vmtargetOffset);
J9Class *interfaceClass = J9_CLASS_FROM_METHOD(interfaceMethod);
UDATA iTableIndex = (UDATA)J9OBJECT_U64_LOAD(currentThread, memberName, vm->vmindexOffset);
UDATA iTableOffset = sizeof(struct J9ITable) + (iTableIndex * sizeof(UDATA));
UDATA vTableOffset = convertITableOffsetToVTableOffset(currentThread, receiverClass, interfaceClass, iTableOffset);
Assert_CodertVM_false(0 == vTableOffset);
Expand All @@ -1668,6 +1659,7 @@ old_fast_jitLookupDynamicPublicInterfaceMethod(J9VMThread *currentThread)
}
return slowPath;
}
#endif /* defined(J9VM_OPT_OPENJDK_METHODHANDLE) */

void J9FASTCALL
old_fast_jitMethodIsNative(J9VMThread *currentThread)
Expand Down Expand Up @@ -3961,9 +3953,10 @@ initPureCFunctionTable(J9JavaVM *vm)
jitConfig->old_fast_jitInstanceOf = (void*)old_fast_jitInstanceOf;
jitConfig->old_fast_jitLookupInterfaceMethod = (void*)old_fast_jitLookupInterfaceMethod;
jitConfig->old_slow_jitLookupInterfaceMethod = (void*)old_slow_jitLookupInterfaceMethod;
jitConfig->old_fast_jitLookupDynamicInterfaceMethod = (void*)old_fast_jitLookupDynamicInterfaceMethod;
#if defined(J9VM_OPT_OPENJDK_METHODHANDLE)
jitConfig->old_fast_jitLookupDynamicPublicInterfaceMethod = (void*)old_fast_jitLookupDynamicPublicInterfaceMethod;
jitConfig->old_slow_jitLookupDynamicPublicInterfaceMethod = (void*)old_slow_jitLookupDynamicPublicInterfaceMethod;
#endif /* defined(J9VM_OPT_OPENJDK_METHODHANDLE) */
jitConfig->old_fast_jitMethodIsNative = (void*)old_fast_jitMethodIsNative;
jitConfig->old_fast_jitMethodIsSync = (void*)old_fast_jitMethodIsSync;
jitConfig->old_fast_jitMethodMonitorEntry = (void*)old_fast_jitMethodMonitorEntry;
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6 changes: 4 additions & 2 deletions runtime/codert_vm/pnathelp.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -369,8 +369,10 @@ OLD_DUAL_MODE_HELPER_NO_RETURN_VALUE(jitPutFlattenableStaticField,3)
OLD_DUAL_MODE_HELPER(jitLoadFlattenableArrayElement,2)
OLD_DUAL_MODE_HELPER_NO_RETURN_VALUE(jitStoreFlattenableArrayElement,3)
SLOW_PATH_ONLY_HELPER_NO_RETURN_VALUE(jitResolveFlattenableField,3)
FAST_PATH_ONLY_HELPER(jitLookupDynamicInterfaceMethod,3)
OLD_DUAL_MODE_HELPER(jitLookupDynamicPublicInterfaceMethod,3)

ifdef({ASM_J9VM_OPT_OPENJDK_METHODHANDLE},{
OLD_DUAL_MODE_HELPER(jitLookupDynamicPublicInterfaceMethod,2)
}) dnl ASM_J9VM_OPT_OPENJDK_METHODHANDLE

dnl Trap handlers

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6 changes: 4 additions & 2 deletions runtime/codert_vm/riscvnathelp.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -292,8 +292,10 @@ OLD_DUAL_MODE_HELPER(jitGetFlattenableStaticField,2)
OLD_DUAL_MODE_HELPER_NO_RETURN_VALUE(jitPutFlattenableStaticField,3)
OLD_DUAL_MODE_HELPER(jitLoadFlattenableArrayElement,2)
OLD_DUAL_MODE_HELPER_NO_RETURN_VALUE(jitStoreFlattenableArrayElement,3)
FAST_PATH_ONLY_HELPER(jitLookupDynamicInterfaceMethod,3)
OLD_DUAL_MODE_HELPER(jitLookupDynamicPublicInterfaceMethod,3)

ifdef({ASM_J9VM_OPT_OPENJDK_METHODHANDLE},{
OLD_DUAL_MODE_HELPER(jitLookupDynamicPublicInterfaceMethod,2)
}) dnl ASM_J9VM_OPT_OPENJDK_METHODHANDLE

dnl Trap handlers

Expand Down
6 changes: 4 additions & 2 deletions runtime/codert_vm/xnathelp.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -419,8 +419,10 @@ OLD_DUAL_MODE_HELPER_NO_RETURN_VALUE(jitPutFlattenableStaticField,3)
OLD_DUAL_MODE_HELPER(jitLoadFlattenableArrayElement,2)
OLD_DUAL_MODE_HELPER_NO_RETURN_VALUE(jitStoreFlattenableArrayElement,3)
SLOW_PATH_ONLY_HELPER_NO_RETURN_VALUE(jitResolveFlattenableField,3)
FAST_PATH_ONLY_HELPER(jitLookupDynamicInterfaceMethod,3)
OLD_DUAL_MODE_HELPER(jitLookupDynamicPublicInterfaceMethod,3)

ifdef({ASM_J9VM_OPT_OPENJDK_METHODHANDLE},{
OLD_DUAL_MODE_HELPER(jitLookupDynamicPublicInterfaceMethod,2)
}) dnl ASM_J9VM_OPT_OPENJDK_METHODHANDLE

dnl Trap handlers

Expand Down
6 changes: 4 additions & 2 deletions runtime/codert_vm/znathelp.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -344,8 +344,10 @@ OLD_DUAL_MODE_HELPER_NO_RETURN_VALUE(jitPutFlattenableStaticField,3)
OLD_DUAL_MODE_HELPER(jitLoadFlattenableArrayElement,2)
OLD_DUAL_MODE_HELPER_NO_RETURN_VALUE(jitStoreFlattenableArrayElement,3)
SLOW_PATH_ONLY_HELPER_NO_RETURN_VALUE(jitResolveFlattenableField,3)
FAST_PATH_ONLY_HELPER(jitLookupDynamicInterfaceMethod,3)
OLD_DUAL_MODE_HELPER(jitLookupDynamicPublicInterfaceMethod,3)

ifdef({ASM_J9VM_OPT_OPENJDK_METHODHANDLE},{
OLD_DUAL_MODE_HELPER(jitLookupDynamicPublicInterfaceMethod,2)
}) dnl ASM_J9VM_OPT_OPENJDK_METHODHANDLE

dnl Trap handlers

Expand Down
29 changes: 22 additions & 7 deletions runtime/compiler/compile/J9SymbolReferenceTable.cpp
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Expand Up @@ -306,13 +306,6 @@ J9::SymbolReferenceTable::findOrCreateStoreFlattenableArrayElementSymbolRef(TR::
}


TR::SymbolReference *
J9::SymbolReferenceTable::findOrCreateLookupDynamicInterfaceMethodSymbolRef()
{
return findOrCreateRuntimeHelper(TR_jitLookupDynamicInterfaceMethod, false, false, true);
}


TR::SymbolReference *
J9::SymbolReferenceTable::findOrCreateLookupDynamicPublicInterfaceMethodSymbolRef()
{
Expand Down Expand Up @@ -860,6 +853,28 @@ J9::SymbolReferenceTable::findOrFabricateShadowSymbol(
return symRef;
}

#if defined(J9VM_OPT_OPENJDK_METHODHANDLE)
TR::SymbolReference *
J9::SymbolReferenceTable::findOrFabricateMemberNameVmTargetShadow()
{
bool isVolatile = false;
bool isPrivate = false;
bool isFinal = true;
TR::SymbolReference *symRef = self()->findOrFabricateShadowSymbol(
comp()->getMethodSymbol(),
TR::Symbol::Java_lang_invoke_MemberName_vmtarget,
TR::Address,
comp()->fej9()->getVMTargetOffset(),
isVolatile,
isPrivate,
isFinal,
"java/lang/invoke/MemberName.vmtarget J");

symRef->getSymbol()->setNotCollected();
return symRef;
}
#endif

TR::SymbolReference *
J9::SymbolReferenceTable::findFlattenedArrayElementFieldShadow(
ResolvedFieldShadowKey key,
Expand Down
16 changes: 9 additions & 7 deletions runtime/compiler/compile/J9SymbolReferenceTable.hpp
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Expand Up @@ -159,16 +159,13 @@ class SymbolReferenceTable : public OMR::SymbolReferenceTableConnector

// This helper walks the iTables to find the VFT offset for an interface
// method that is not known until runtime (and therefore does not have an
// IPIC data snippet). The parameters are the receiver class, interface
// class, and iTable index (though in the trees they must appear as
// children in the opposite order), and the return value is the VFT offset.
// IPIC data snippet). The parameters are the receiver class and MemberName
// (though in the trees they must appear as children in the opposite order),
// and the return value is the VFT offset.
//
// The given receiver class must implement the given interface class.
// IllegalAccessError is thrown if the dispatched callee is not public.
//
TR::SymbolReference * findOrCreateLookupDynamicInterfaceMethodSymbolRef();

// This helper is a variant of jitLookupDynamicInterfaceMethod that requires
// the dispatched callee to be public, otherwise throwing IllegalAccessError.
TR::SymbolReference * findOrCreateLookupDynamicPublicInterfaceMethodSymbolRef();

TR::SymbolReference * findOrCreateShadowSymbol(TR::ResolvedMethodSymbol * owningMethodSymbol, int32_t cpIndex, bool isStore);
Expand Down Expand Up @@ -201,6 +198,11 @@ class SymbolReferenceTable : public OMR::SymbolReferenceTableConnector
*/
TR::SymbolReference * findOrFabricateShadowSymbol(TR_OpaqueClassBlock *containingClass, TR::DataType type, uint32_t offset, bool isVolatile, bool isPrivate, bool isFinal, const char *name, const char *signature);

#if defined(J9VM_OPT_OPENJDK_METHODHANDLE)
/// Find or fabricate the shadow symref for MemberName.vmtarget
TR::SymbolReference * findOrFabricateMemberNameVmTargetShadow();
#endif

/** \brief
* Returns an array shadow symbol reference fabricated for the field of a flattened array element.
*
Expand Down
6 changes: 4 additions & 2 deletions runtime/compiler/control/JITClientCompilationThread.cpp
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Expand Up @@ -1135,10 +1135,12 @@ handleServerMessage(JITServer::ClientStream *client, TR_J9VM *fe, JITServer::Mes
client->write(response, fe->isLambdaFormGeneratedMethod(std::get<0>(recv)));
}
break;
case MessageType::VM_vTableOrITableIndexFromMemberName:
case MessageType::VM_getMemberNameMethodInfo:
{
auto recv = client->getRecvData<TR::KnownObjectTable::Index>();
client->write(response, fe->vTableOrITableIndexFromMemberName(comp, std::get<0>(recv)));
TR_J9VMBase::MemberNameMethodInfo info = {};
uintptr_t ok = fe->getMemberNameMethodInfo(comp, std::get<0>(recv), &info);
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client->write(response, ok, info.vmtarget, info.vmindex, info.clazz, info.refKind);
}
break;
case MessageType::VM_delegatingMethodHandleTarget:
Expand Down
71 changes: 33 additions & 38 deletions runtime/compiler/env/VMJ9.cpp
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Expand Up @@ -4755,49 +4755,44 @@ TR_J9VMBase::targetMethodFromMethodHandle(TR::Compilation* comp, TR::KnownObject
return NULL;
}

J9JNIMethodID*
TR_J9VMBase::jniMethodIdFromMemberName(uintptr_t memberName)
bool
TR_J9VMBase::getMemberNameMethodInfo(
TR::Compilation* comp,
TR::KnownObjectTable::Index objIndex,
MemberNameMethodInfo *out)
{
TR_ASSERT(haveAccess(), "jniMethodIdFromMemberName requires VM access");
return (J9JNIMethodID *)J9OBJECT_U64_LOAD(vmThread(), memberName, vmThread()->javaVM->vmindexOffset);
}
*out = {};
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This doesn't compile on z/OS:

13:10:07  "/jenkins/workspace/Build_JDK17_s390x_zos_Personal/openj9/runtime/compiler/env/VMJ9.cpp", line 4764.11: CCN5063 (S) The text "{" is unexpected.
13:10:07  CCN0793(I) Compilation failed for file /jenkins/workspace/Build_JDK17_s390x_zos_Personal/openj9/runtime/compiler/env/VMJ9.cpp.  Object file not created.
13:10:07  runtime/compiler/CMakeFiles/j9jit.dir/build.make:960: recipe for target 'runtime/compiler/CMakeFiles/j9jit.dir/env/VMJ9.cpp.o' failed
13:10:07  make[6]: *** [runtime/compiler/CMakeFiles/j9jit.dir/env/VMJ9.cpp.o] Error 12

@jdmpapin Is there another way to say this that will be accepted by older compilers?

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Should it be {0} perhaps?

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The text "{" is unexpected.

suggests that we might get the same error from {0}. I think {} should work as an initializer though. I'll try this:

MemberNameMethodInfo zero = {};
*out = zero;

and of course check to make sure that it compiles on z/OS

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@jdmpapin jdmpapin Sep 7, 2023 •
edited
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It looks like it should work to use

MemberNameMethodInfo zero = {0};

With {}, the build compiler complained that zero was potentially uninitialized

My personal z/OS build failed for a reason I don't understand. I think it's unrelated, but I've asked for some help confirming that my change builds. I'll open a PR as soon as I get confirmation

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#18087


if (objIndex == TR::KnownObjectTable::UNKNOWN)
return false;

J9JNIMethodID*
TR_J9VMBase::jniMethodIdFromMemberName(TR::Compilation* comp, TR::KnownObjectTable::Index objIndex)
{
auto knot = comp->getKnownObjectTable();
if (objIndex != TR::KnownObjectTable::UNKNOWN &&
knot &&
!knot->isNull(objIndex))
{
TR::VMAccessCriticalSection jniMethodId(this);
uintptr_t object = knot->getPointer(objIndex);
return jniMethodIdFromMemberName(object);
}
return NULL;
}
if (knot == NULL || knot->isNull(objIndex))
return false;

uintptr_t
TR_J9VMBase::vTableOrITableIndexFromMemberName(uintptr_t memberName)
{
TR_ASSERT(haveAccess(), "vTableOrITableIndexFromMemberName requires VM access");
auto methodID = jniMethodIdFromMemberName(memberName);
return methodID->vTableIndex;
}
TR::VMAccessCriticalSection getMemberNameMethodInfo(this);
uintptr_t object = knot->getPointer(objIndex);
const char *mnClassName = "java/lang/invoke/MemberName";
int32_t mnClassNameLen = (int32_t)strlen(mnClassName);
TR_OpaqueClassBlock *mnClass =
getSystemClassFromClassName(mnClassName, mnClassNameLen);

uintptr_t
TR_J9VMBase::vTableOrITableIndexFromMemberName(TR::Compilation* comp, TR::KnownObjectTable::Index objIndex)
{
auto knot = comp->getKnownObjectTable();
if (objIndex != TR::KnownObjectTable::UNKNOWN &&
knot &&
!knot->isNull(objIndex))
{
TR::VMAccessCriticalSection vTableOrITableIndex(this);
uintptr_t object = knot->getPointer(objIndex);
return vTableOrITableIndexFromMemberName(object);
}
return (uintptr_t)-1;
if (getObjectClass(object) != mnClass)
return false;

int32_t flags = getInt32Field(object, "flags");
if ((flags & (MN_IS_METHOD | MN_IS_CONSTRUCTOR)) == 0)
return false;

auto tgt = J9OBJECT_U64_LOAD(vmThread(), object, vmThread()->javaVM->vmtargetOffset);
auto ix = J9OBJECT_U64_LOAD(vmThread(), object, vmThread()->javaVM->vmindexOffset);
uintptr_t jlClass = getReferenceField(object, "clazz", "Ljava/lang/Class;");

out->vmtarget = (TR_OpaqueMethodBlock*)(uintptr_t)tgt;
out->vmindex = (uintptr_t)ix;
out->clazz = getClassFromJavaLangClass(jlClass);
out->refKind = (flags >> MN_REFERENCE_KIND_SHIFT) & MN_REFERENCE_KIND_MASK;
return true;
}

bool
Expand Down
42 changes: 20 additions & 22 deletions runtime/compiler/env/VMJ9.h
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Expand Up @@ -875,30 +875,28 @@ class TR_J9VMBase : public TR_FrontEnd
* VM access is not required
*/
virtual TR_OpaqueMethodBlock* targetMethodFromMethodHandle(TR::Compilation* comp, TR::KnownObjectTable::Index objIndex);

/// A summary of the method dispatch information in a MemberName.
struct MemberNameMethodInfo
{
TR_OpaqueMethodBlock *vmtarget; ///< the target J9Method
uintptr_t vmindex; ///< the interpreter vtable offset, itable index, or -1
TR_OpaqueClassBlock *clazz; ///< the relevant subtype of the defining class of vmtarget
int32_t refKind; ///< one of the MH_REF_* constants (JVMS table 5.4.3.5-A)
};

/*
* \brief
* Return MemberName.vmindex, a J9JNIMethodID pointer containing vtable/itable offset for the MemberName method
* Caller must acquire VM access
*/
virtual J9JNIMethodID* jniMethodIdFromMemberName(uintptr_t memberName);
/*
* \brief
* Return MemberName.vmindex, a J9JNIMethodID pointer containing vtable/itable offset for the MemberName method
* VM access is not required
*/
virtual J9JNIMethodID* jniMethodIdFromMemberName(TR::Compilation* comp, TR::KnownObjectTable::Index objIndex);
/*
* \brief
* Return vtable or itable index of a method represented by MemberName
* Caller must acquire VM access
*/
virtual uintptr_t vTableOrITableIndexFromMemberName(uintptr_t memberName);
/*
* \brief
* Return vtable or itable index of a method represented by MemberName
* VM access is not required
* \brief Summarize a MemberName representing a method or constructor.
*
* \param comp the compilation object
* \param objIndex the known object index of the MemberName object
* \param[out] out filled on success, zeroed on failure
* \return true on success, false on error (e.g. not a MemberName)
*/
virtual uintptr_t vTableOrITableIndexFromMemberName(TR::Compilation* comp, TR::KnownObjectTable::Index objIndex);
virtual bool getMemberNameMethodInfo(
TR::Compilation* comp,
TR::KnownObjectTable::Index objIndex,
MemberNameMethodInfo *out);

/**
* \brief
Expand Down
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