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java_lang_invoke_MethodHandleNatives.cpp
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java_lang_invoke_MethodHandleNatives.cpp
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/*******************************************************************************
* Copyright IBM Corp. and others 2021
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] https://openjdk.org/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
*******************************************************************************/
#include "j9.h"
#include "jclprots.h"
#include "j9cp.h"
#include "j9protos.h"
#include "ut_j9jcl.h"
#include "j9port.h"
#include "jclglob.h"
#include "jcl_internal.h"
#include "util_api.h"
#include "j9vmconstantpool.h"
#include "ObjectAccessBarrierAPI.hpp"
#include "objhelp.h"
#include <string.h>
#include <assert.h>
#include "VMHelpers.hpp"
extern "C" {
#if defined(J9VM_OPT_OPENJDK_METHODHANDLE)
/* Constants mapped from java.lang.invoke.MethodHandleNatives$Constants
* These constants are validated by the MethodHandleNatives$Constants.verifyConstants()
* method when Java assertions are enabled
*/
#define MN_SEARCH_SUPERCLASSES 0x00100000
#define MN_SEARCH_INTERFACES 0x00200000
#if JAVA_SPEC_VERSION >= 16
#define MN_MODULE_MODE 0x00000010
#define MN_UNCONDITIONAL_MODE 0x00000020
#define MN_TRUSTED_MODE -1
#endif /* JAVA_SPEC_VERSION >= 16 */
/* PlaceHolder value used for MN.vmindex that has default method conflict */
#define J9VM_RESOLVED_VMINDEX_FOR_DEFAULT_THROW 1
J9_DECLARE_CONSTANT_UTF8(mutableCallSite, "java/lang/invoke/MutableCallSite");
static bool
isPolymorphicMHMethod(J9JavaVM *vm, J9Class *declaringClass, J9UTF8 *methodName)
{
if (declaringClass == J9VMJAVALANGINVOKEMETHODHANDLE(vm)) {
U_8 *nameData = J9UTF8_DATA(methodName);
U_16 nameLength = J9UTF8_LENGTH(methodName);
if (J9UTF8_LITERAL_EQUALS(nameData, nameLength, "invoke")
|| J9UTF8_LITERAL_EQUALS(nameData, nameLength, "invokeBasic")
|| J9UTF8_LITERAL_EQUALS(nameData, nameLength, "linkToVirtual")
|| J9UTF8_LITERAL_EQUALS(nameData, nameLength, "linkToStatic")
|| J9UTF8_LITERAL_EQUALS(nameData, nameLength, "linkToSpecial")
|| J9UTF8_LITERAL_EQUALS(nameData, nameLength, "linkToInterface")
|| J9UTF8_LITERAL_EQUALS(nameData, nameLength, "linkToNative")
) {
return true;
}
}
return false;
}
/**
* @brief Add a MemberName to the list of MemberNames for the J9Class that will
* correspond to its clazz field.
*
* This must be done immediately prior to initializing vmtarget.
*
* clazzObject must be the value of the MemberName's clazz field, or the value
* that will be assigned to clazz immediately upon success.
*
* On error, the current exception will be set:
* - to OutOfMemoryError for allocation failure.
*
* The caller must have VM access.
*
* @param[in] currentThread the J9VMThread of the current thread
* @param[in] memberNameObject the MemberName object to add to the list
* @param[in] clazzObject the value of memberNameObject.clazz
* @return true for success, or false on error
*/
static bool
addMemberNameToClass(J9VMThread *currentThread, j9object_t memberNameObject, j9object_t clazzObject)
{
J9JavaVM *vm = currentThread->javaVM;
J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
J9Class *j9clazz = J9VM_J9CLASS_FROM_HEAPCLASS(currentThread, clazzObject);
jobject weakRef = vmFuncs->j9jni_createGlobalRef((JNIEnv*)currentThread, memberNameObject, JNI_TRUE);
omrthread_monitor_enter(vm->memberNameListsMutex);
if (J9_ARE_ALL_BITS_SET(j9clazz->classFlags, J9ClassNeedToPruneMemberNames)) {
VM_AtomicSupport::bitAndU32((volatile uint32_t*)&j9clazz->classFlags, ~(uint32_t)J9ClassNeedToPruneMemberNames);
/* Remove all entries of memberNames for which the JNI weak ref has been cleared. */
J9MemberNameListNode **cur = &j9clazz->memberNames;
while (NULL != *cur) {
j9object_t obj = J9_JNI_UNWRAP_REFERENCE((*cur)->memberName);
if (NULL == obj) {
/* The MemberName has been collected. Remove this entry. */
J9MemberNameListNode *next = (*cur)->next;
vmFuncs->j9jni_deleteGlobalRef((JNIEnv*)currentThread, (*cur)->memberName, JNI_TRUE);
pool_removeElement(vm->memberNameListNodePool, *cur);
*cur = next;
} else {
cur = &(*cur)->next;
}
}
}
J9MemberNameListNode *node = (J9MemberNameListNode *)pool_newElement(vm->memberNameListNodePool);
bool success = false;
if ((NULL != weakRef) && (NULL != node)) {
/* Initialize node and push it onto the front of the list. */
node->memberName = weakRef;
node->next = j9clazz->memberNames;
j9clazz->memberNames = node;
success = true;
} else {
/* Failed to allocate either weakRef or node. */
if (NULL != node) {
pool_removeElement(vm->memberNameListNodePool, node);
}
if (NULL != weakRef) {
vmFuncs->j9jni_deleteGlobalRef((JNIEnv*)currentThread, weakRef, JNI_TRUE);
}
vmFuncs->setNativeOutOfMemoryError(currentThread, 0, 0);
}
omrthread_monitor_exit(vm->memberNameListsMutex);
return success;
}
/* Private MemberName object init helper
*
* Set the MemberName fields based on the refObject given:
* For j.l.reflect.Field:
* find JNIFieldID for refObject, create j.l.String for name and signature and store in MN.name/type fields.
* set vmindex to the fieldID pointer and target to the field offset.
* set MN.clazz to declaring class in the fieldID struct.
* For j.l.reflect.Method or j.l.reflect.Constructor:
* find JNIMethodID, set target to the J9Method and vmindex as appropriate for dispatch.
* set MN.clazz to the refObject's declaring class.
*
* Then for both, compute the MN.flags using access flags and invocation type based on the JNI-id.
*
* Throw an IllegalArgumentException if the refObject is not a Field/Method/Constructor
*
* Note: caller must have vmaccess before invoking this helper
*/
static void
initImpl(J9VMThread *currentThread, j9object_t membernameObject, j9object_t refObject)
{
J9JavaVM *vm = currentThread->javaVM;
const J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
J9Class* refClass = J9OBJECT_CLAZZ(currentThread, refObject);
jint flags = 0;
jlong vmindex = 0;
jlong target = 0;
j9object_t clazzObject = NULL;
j9object_t nameObject = NULL;
j9object_t typeObject = NULL;
if (refClass == J9VMJAVALANGREFLECTFIELD(vm)) {
J9JNIFieldID *fieldID = vm->reflectFunctions.idFromFieldObject(currentThread, NULL, refObject);
J9ROMFieldShape *romField = fieldID->field;
UDATA offset = fieldID->offset;
if (J9_ARE_ANY_BITS_SET(romField->modifiers, J9AccStatic)) {
offset |= J9_SUN_STATIC_FIELD_OFFSET_TAG;
if (J9_ARE_ANY_BITS_SET(romField->modifiers, J9AccFinal)) {
offset |= J9_SUN_FINAL_FIELD_OFFSET_TAG;
}
}
vmindex = (jlong)fieldID;
target = (jlong)offset;
flags = fieldID->field->modifiers & CFR_FIELD_ACCESS_MASK;
flags |= MN_IS_FIELD;
flags |= (J9_ARE_ANY_BITS_SET(flags, J9AccStatic) ? MH_REF_GETSTATIC : MH_REF_GETFIELD) << MN_REFERENCE_KIND_SHIFT;
if (VM_VMHelpers::isTrustedFinalField(fieldID->field, fieldID->declaringClass->romClass)) {
flags |= MN_TRUSTED_FINAL;
}
#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
if (J9ROMFIELD_IS_NULL_RESTRICTED(romField)) {
if (vmFuncs->isFlattenableFieldFlattened(fieldID->declaringClass, fieldID->field)) {
flags |= MN_FLAT_FIELD;
}
}
#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
nameObject = J9VMJAVALANGREFLECTFIELD_NAME(currentThread, refObject);
typeObject = J9VMJAVALANGREFLECTFIELD_TYPE(currentThread, refObject);
clazzObject = J9VM_J9CLASS_TO_HEAPCLASS(fieldID->declaringClass);
} else if (refClass == J9VMJAVALANGREFLECTMETHOD(vm)) {
J9JNIMethodID *methodID = vm->reflectFunctions.idFromMethodObject(currentThread, refObject);
target = (jlong)methodID->method;
J9ROMMethod *romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(methodID->method);
J9Class *declaringClass = J9_CLASS_FROM_METHOD(methodID->method);
J9UTF8 *methodName = J9ROMMETHOD_NAME(romMethod);
if (isPolymorphicMHMethod(vm, declaringClass, methodName)
#if JAVA_SPEC_VERSION >= 9
|| ((declaringClass == J9VMJAVALANGINVOKEVARHANDLE(vm))
&& VM_VMHelpers::isPolymorphicVarHandleMethod(J9UTF8_DATA(methodName), J9UTF8_LENGTH(methodName)))
#endif
) {
/* Do not initialize polymorphic MH/VH methods as the Java code handles the "MemberName.clazz == null" case for them. */
return;
}
flags = romMethod->modifiers & CFR_METHOD_ACCESS_MASK;
if (J9_ARE_ANY_BITS_SET(romMethod->modifiers, J9AccMethodCallerSensitive)) {
flags |= MN_CALLER_SENSITIVE;
}
flags |= MN_IS_METHOD;
if (J9_ARE_ANY_BITS_SET(methodID->vTableIndex, J9_JNI_MID_INTERFACE)) {
flags |= MH_REF_INVOKEINTERFACE << MN_REFERENCE_KIND_SHIFT;
} else if (J9_ARE_ANY_BITS_SET(romMethod->modifiers , J9AccStatic)) {
flags |= MH_REF_INVOKESTATIC << MN_REFERENCE_KIND_SHIFT;
} else if (J9_ARE_ANY_BITS_SET(romMethod->modifiers , J9AccFinal) || !J9ROMMETHOD_HAS_VTABLE(romMethod)) {
flags |= MH_REF_INVOKESPECIAL << MN_REFERENCE_KIND_SHIFT;
} else {
flags |= MH_REF_INVOKEVIRTUAL << MN_REFERENCE_KIND_SHIFT;
}
nameObject = J9VMJAVALANGREFLECTMETHOD_NAME(currentThread, refObject);
clazzObject = J9VMJAVALANGREFLECTMETHOD_CLAZZ(currentThread, refObject);
J9Class *clazz = J9VM_J9CLASS_FROM_HEAPCLASS(currentThread, clazzObject);
vmindex = vmindexValueForMethodMemberName(methodID, clazz, flags);
} else if (refClass == J9VMJAVALANGREFLECTCONSTRUCTOR(vm)) {
J9JNIMethodID *methodID = vm->reflectFunctions.idFromConstructorObject(currentThread, refObject);
vmindex = -1;
target = (jlong)methodID->method;
J9ROMMethod *romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(methodID->method);
flags = romMethod->modifiers & CFR_METHOD_ACCESS_MASK;
if (J9_ARE_ANY_BITS_SET(romMethod->modifiers, J9AccMethodCallerSensitive)) {
flags |= MN_CALLER_SENSITIVE;
}
flags |= MN_IS_CONSTRUCTOR | (MH_REF_INVOKESPECIAL << MN_REFERENCE_KIND_SHIFT);
clazzObject = J9VMJAVALANGREFLECTMETHOD_CLAZZ(currentThread, refObject);
} else {
vmFuncs->setCurrentExceptionUTF(currentThread, J9VMCONSTANTPOOL_JAVALANGILLEGALARGUMENTEXCEPTION, NULL);
}
if (!VM_VMHelpers::exceptionPending(currentThread)) {
if (addMemberNameToClass(currentThread, membernameObject, clazzObject)) {
J9VMJAVALANGINVOKEMEMBERNAME_SET_FLAGS(currentThread, membernameObject, flags);
J9VMJAVALANGINVOKEMEMBERNAME_SET_NAME(currentThread, membernameObject, nameObject);
if (NULL != typeObject) {
Assert_JCL_true(OMR_ARE_ALL_BITS_SET(flags, MN_IS_FIELD));
J9VMJAVALANGINVOKEMEMBERNAME_SET_TYPE(currentThread, membernameObject, typeObject);
}
J9VMJAVALANGINVOKEMEMBERNAME_SET_CLAZZ(currentThread, membernameObject, clazzObject);
J9OBJECT_U64_STORE(currentThread, membernameObject, vm->vmindexOffset, (U_64)vmindex);
J9OBJECT_U64_STORE(currentThread, membernameObject, vm->vmtargetOffset, (U_64)target);
Trc_JCL_java_lang_invoke_MethodHandleNatives_initImpl_setData(currentThread, flags, nameObject, typeObject, clazzObject, vmindex, target);
}
}
}
struct LocalJ9UTF8Buffer {
/**
* Constructs an empty LocalJ9UTF8Buffer.
*/
LocalJ9UTF8Buffer()
: utf8(nullptr)
, capacity(0)
, cursor(nullptr)
{
}
/**
* Constructs a LocalJ9UTF8Buffer object from a J9UTF8 object pointer
* and its size.
* @param[in] buffer Pointer to the J9UTF8 buffer
* @param[in] length Length of the entire J9UTF8 buffer in bytes
*/
LocalJ9UTF8Buffer(J9UTF8 *buffer, size_t length)
: utf8(buffer)
, capacity(length - offsetof(J9UTF8, data))
, cursor(J9UTF8_DATA(buffer))
{
}
/**
* Calculate the remaining slots in the buffer.
* @return number of remaining slots in the buffer
*/
size_t remaining()
{
return capacity - static_cast<size_t>(cursor - J9UTF8_DATA(utf8));
}
/**
* Put a character into the buffer at the cursor, then advance the cursor.
* @param[in] c The character to put into the buffer
*/
void putCharAtCursor(char c)
{
*cursor = c;
cursor += 1;
}
/**
* Advance the cursor n slots.
* @param[in] n The number of slots to advance the cursor by
*/
void advanceN(size_t n)
{
cursor += n;
}
/**
* Null-terminates the data, and sets the J9UTF8 length from a cursor-position calculation.
*/
void commitLength()
{
*cursor = '\0';
J9UTF8_SET_LENGTH(utf8, static_cast<U_16>(cursor - J9UTF8_DATA(utf8)));
}
J9UTF8 *utf8; /**< Pointer to the J9UTF8 struct */
size_t capacity; /**< Capacity of the J9UTF8 data buffer */
U_8 *cursor; /**< Pointer to current position in J9UTF8 data buffer */
};
/**
* Returns a character corresponding to a primitive-type class.
* @param[in] vm J9JavaVM instance for current thread
* @param[in] clazz The class of signature character of interest
* @return character to newly allocated and filled-in signature buffer
* @return the character corresponding to a primitive type
*/
static VMINLINE char
sigForPrimitiveOrVoid(J9JavaVM *vm, J9Class *clazz)
{
char c = '\0';
if (clazz == vm->booleanReflectClass) {
c = 'Z';
} else if (clazz == vm->byteReflectClass) {
c = 'B';
} else if (clazz == vm->charReflectClass) {
c = 'C';
} else if (clazz == vm->shortReflectClass) {
c = 'S';
} else if (clazz == vm->intReflectClass) {
c = 'I';
} else if (clazz == vm->longReflectClass) {
c = 'J';
} else if (clazz == vm->floatReflectClass) {
c = 'F';
} else if (clazz == vm->doubleReflectClass) {
c = 'D';
} else if (clazz == vm->voidReflectClass) {
c = 'V';
}
return c;
}
/**
* Gets a class signature's string length.
* @param[in] currentThread The J9VMThread of the current thread
* @param[in] clazz The class whose signature is being queried
* @return length of a class' signature without null-termination
*/
static UDATA
getClassSignatureLength(J9VMThread *currentThread, J9Class *clazz)
{
J9JavaVM *vm = currentThread->javaVM;
UDATA signatureLength = 0;
if (J9ROMCLASS_IS_PRIMITIVE_TYPE(clazz->romClass)) {
signatureLength = 1;
} else {
j9object_t sigString = J9VMJAVALANGCLASS_CLASSNAMESTRING(currentThread, J9VM_J9CLASS_TO_HEAPCLASS(clazz));
if (NULL != sigString) {
/* +2 so that we can fit 'L' and ';' around the class name. */
signatureLength = vm->internalVMFunctions->getStringUTF8Length(currentThread, sigString) + 2;
} else {
J9Class *myClass = clazz;
UDATA numDims = 0;
bool isPrimitive = false;
if (J9CLASS_IS_ARRAY(myClass)) {
J9ArrayClass *arrayClazz = reinterpret_cast<J9ArrayClass *>(myClass);
numDims = arrayClazz->arity;
J9Class *leafComponentType = arrayClazz->leafComponentType;
isPrimitive = J9ROMCLASS_IS_PRIMITIVE_TYPE(leafComponentType->romClass);
if (isPrimitive) {
/* -1 to account for the '[' already prepended to the primitive array class' name.
* Result guaranteed to be >= 0 because the minimum arity for a J9ArrayClass is 1.
*/
numDims -= 1;
myClass = leafComponentType->arrayClass;
} else {
myClass = leafComponentType;
}
}
if (!isPrimitive) {
/* +2 so that we can fit 'L' and ';' around the class name. */
signatureLength += 2;
}
J9UTF8 *romName = J9ROMCLASS_CLASSNAME(myClass->romClass);
U_32 nameLength = J9UTF8_LENGTH(romName);
signatureLength += nameLength + numDims;
}
}
return signatureLength;
}
/**
* Fills in a class signature into a signature buffer.
* @param[in] currentThread The J9VMThread of the current thread
* @param[in] clazz The class whose signature is being queried
* @param[in,out] stringBuffer The signature buffer to place the signature into
* @return true if the signature fits into stringBuffer, false otherwise
*/
static bool
getClassSignatureInout(J9VMThread *currentThread, J9Class *clazz, LocalJ9UTF8Buffer *stringBuffer)
{
J9JavaVM *vm = currentThread->javaVM;
bool result = false;
if (J9ROMCLASS_IS_PRIMITIVE_TYPE(clazz->romClass)) {
/* 2 to ensure that a null-termination can be appended if this primitive type is
* the final type in the signature.
*/
if (2 <= stringBuffer->remaining()) {
const char c = sigForPrimitiveOrVoid(vm, clazz);
stringBuffer->putCharAtCursor(c);
result = true;
}
} else {
j9object_t sigString = J9VMJAVALANGCLASS_CLASSNAMESTRING(currentThread, J9VM_J9CLASS_TO_HEAPCLASS(clazz));
if (NULL != sigString) {
/* +3 so that we can fit 'L' and ';' around the class name and add null-terminator. */
UDATA utfLength = vm->internalVMFunctions->getStringUTF8Length(currentThread, sigString) + 3;
if (utfLength <= stringBuffer->remaining()) {
if (J9ROMCLASS_IS_ARRAY(clazz->romClass)) {
vm->internalVMFunctions->copyStringToUTF8Helper(
currentThread, sigString, J9_STR_XLAT, 0, J9VMJAVALANGSTRING_LENGTH(currentThread, sigString),
stringBuffer->cursor, utfLength - 3);
/* Adjust cursor to account for the call to copyStringToUTF8Helper. */
stringBuffer->advanceN(utfLength - 3);
} else {
stringBuffer->putCharAtCursor('L');
vm->internalVMFunctions->copyStringToUTF8Helper(
currentThread, sigString, J9_STR_XLAT, 0, J9VMJAVALANGSTRING_LENGTH(currentThread, sigString),
stringBuffer->cursor, utfLength - 3);
/* Adjust cursor to account for the call to copyStringToUTF8Helper. */
stringBuffer->advanceN(utfLength - 3);
stringBuffer->putCharAtCursor(';');
}
result = true;
}
} else {
J9Class *myClass = clazz;
UDATA numDims = 0;
bool isPrimitive = false;
if (J9CLASS_IS_ARRAY(myClass)) {
J9ArrayClass *arrayClazz = reinterpret_cast<J9ArrayClass *>(myClass);
numDims = arrayClazz->arity;
J9Class *leafComponentType = arrayClazz->leafComponentType;
isPrimitive = J9ROMCLASS_IS_PRIMITIVE_TYPE(leafComponentType->romClass);
if (isPrimitive) {
/* -1 to account for the '[' already prepended to the primitive array class' name.
* Result guaranteed to be >= 0 because the minimum arity for a J9ArrayClass is 1.
*/
numDims -= 1;
myClass = leafComponentType->arrayClass;
} else {
myClass = leafComponentType;
}
}
/* +1 to ensure we can add a null-terminator. */
UDATA sigLength = 1;
if (!isPrimitive) {
/* +2 so that we can fit 'L' and ';' around the class name. */
sigLength += 2;
}
J9UTF8 *romName = J9ROMCLASS_CLASSNAME(myClass->romClass);
U_32 nameLength = J9UTF8_LENGTH(romName);
const char *name = reinterpret_cast<const char *>(J9UTF8_DATA(romName));
sigLength += nameLength + numDims;
if (sigLength <= stringBuffer->remaining()) {
for (UDATA i = 0; i < numDims; i++) {
stringBuffer->putCharAtCursor('[');
}
if (!isPrimitive) {
stringBuffer->putCharAtCursor('L');
}
memcpy(stringBuffer->cursor, name, nameLength);
/* Adjust cursor to account for the memcpy. */
stringBuffer->advanceN(nameLength);
if (!isPrimitive) {
stringBuffer->putCharAtCursor(';');
}
result = true;
}
}
}
return result;
}
/**
* Allocates a J9UTF8 signature buffer and places a method signature constructed from a MethodType into it.
* @param[in] currentThread The J9VMThread of the current thread
* @param[in] typeObject A MethodType object that contains parameter and return type information
* @return pointer to newly allocated and filled-in JUTF8 signature buffer
*/
static J9UTF8 *
getJ9UTF8SignatureFromMethodTypeWithMemAlloc(J9VMThread *currentThread, j9object_t typeObject)
{
J9JavaVM *vm = currentThread->javaVM;
j9object_t ptypes = J9VMJAVALANGINVOKEMETHODTYPE_PTYPES(currentThread, typeObject);
U_32 numArgs = J9INDEXABLEOBJECT_SIZE(currentThread, ptypes);
UDATA signatureLength = 2; /* space for '(', ')' */
PORT_ACCESS_FROM_JAVAVM(vm);
/* Calculate total signature length, including all ptypes and rtype. */
for (U_32 i = 0; i < numArgs; i++) {
j9object_t pObject = J9JAVAARRAYOFOBJECT_LOAD(currentThread, ptypes, i);
J9Class *pclass = J9VM_J9CLASS_FROM_HEAPCLASS(currentThread, pObject);
signatureLength += getClassSignatureLength(currentThread, pclass);
}
j9object_t rtype = J9VMJAVALANGINVOKEMETHODTYPE_RTYPE(currentThread, typeObject);
J9Class *rclass = J9VM_J9CLASS_FROM_HEAPCLASS(currentThread, rtype);
signatureLength += getClassSignatureLength(currentThread, rclass);
UDATA signatureUtf8Size = signatureLength + sizeof(J9UTF8) + 1; /* +1 for a null-terminator */
J9UTF8 *result = reinterpret_cast<J9UTF8 *>(j9mem_allocate_memory(signatureUtf8Size, OMRMEM_CATEGORY_VM));
if (NULL != result) {
LocalJ9UTF8Buffer stringBuffer(result, signatureUtf8Size);
stringBuffer.putCharAtCursor('(');
for (U_32 i = 0; i < numArgs; i++) {
j9object_t pObject = J9JAVAARRAYOFOBJECT_LOAD(currentThread, ptypes, i);
J9Class *pclass = J9VM_J9CLASS_FROM_HEAPCLASS(currentThread, pObject);
getClassSignatureInout(currentThread, pclass, &stringBuffer);
}
stringBuffer.putCharAtCursor(')');
j9object_t rtype = J9VMJAVALANGINVOKEMETHODTYPE_RTYPE(currentThread, typeObject);
J9Class *rclass = J9VM_J9CLASS_FROM_HEAPCLASS(currentThread, rtype);
getClassSignatureInout(currentThread, rclass, &stringBuffer);
stringBuffer.commitLength();
}
return result;
}
/**
* Attempts to fill in a method signature constructed from a MethodType into a passed in signature buffer.
* Falls back to a dynamic buffer allocation if the statically allocated buffer's capacity is exceeded.
* @param[in] currentThread The J9VMThread of the current thread
* @param[in] typeObject A MethodType object that contains parameter and return type information
* @param[in,out] stringBuffer The signature buffer to place the signature into
* @return pointer to a filled-in JUTF8 signature buffer, either the dynamically or statically allocated buffer
*/
static J9UTF8 *
getJ9UTF8SignatureFromMethodType(J9VMThread *currentThread, j9object_t typeObject, LocalJ9UTF8Buffer *stringBuffer)
{
j9object_t ptypes = J9VMJAVALANGINVOKEMETHODTYPE_PTYPES(currentThread, typeObject);
U_32 numArgs = J9INDEXABLEOBJECT_SIZE(currentThread, ptypes);
stringBuffer->putCharAtCursor('(');
for (U_32 i = 0; i < numArgs; i++) {
j9object_t pObject = J9JAVAARRAYOFOBJECT_LOAD(currentThread, ptypes, i);
J9Class *pclass = J9VM_J9CLASS_FROM_HEAPCLASS(currentThread, pObject);
if (!getClassSignatureInout(currentThread, pclass, stringBuffer)) {
/* Failing getClassSignatureInout means stringBuffer exceeded capacity.
* Fall back to dynamic allocation.
*/
return getJ9UTF8SignatureFromMethodTypeWithMemAlloc(currentThread, typeObject);
}
}
if (1 >= stringBuffer->remaining()) {
/* Not enough space left in statically allocated buffer.
* Fall back to dynamic allocation.
*/
return getJ9UTF8SignatureFromMethodTypeWithMemAlloc(currentThread, typeObject);
}
stringBuffer->putCharAtCursor(')');
/* Return type */
j9object_t rtype = J9VMJAVALANGINVOKEMETHODTYPE_RTYPE(currentThread, typeObject);
J9Class *rclass = J9VM_J9CLASS_FROM_HEAPCLASS(currentThread, rtype);
if (!getClassSignatureInout(currentThread, rclass, stringBuffer)) {
/* Failing getClassSignatureInout means stringBuffer exceeded capacity.
* Fall back to dynamic allocation.
*/
return getJ9UTF8SignatureFromMethodTypeWithMemAlloc(currentThread, typeObject);
}
if (0 == stringBuffer->remaining()) {
/* Not enough space left in statically allocated buffer.
* Fall back to dynamic allocation.
*/
return getJ9UTF8SignatureFromMethodTypeWithMemAlloc(currentThread, typeObject);
}
stringBuffer->commitLength();
return stringBuffer->utf8;
}
j9object_t
resolveRefToObject(J9VMThread *currentThread, J9ConstantPool *ramConstantPool, U_16 cpIndex, bool resolve)
{
J9JavaVM *vm = currentThread->javaVM;
const J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
j9object_t result = NULL;
J9RAMSingleSlotConstantRef *ramCP = (J9RAMSingleSlotConstantRef*)ramConstantPool + cpIndex;
U_32 *cpShapeDescription = J9ROMCLASS_CPSHAPEDESCRIPTION(J9_CLASS_FROM_CP(ramConstantPool)->romClass);
switch (J9_CP_TYPE(cpShapeDescription, cpIndex)) {
case J9CPTYPE_CLASS: {
J9Class *clazz = (J9Class*)ramCP->value;
if ((NULL == clazz) && resolve) {
clazz = vmFuncs->resolveClassRef(currentThread, ramConstantPool, cpIndex, J9_RESOLVE_FLAG_RUNTIME_RESOLVE);
}
if (NULL != clazz) {
result = J9VM_J9CLASS_TO_HEAPCLASS(clazz);
}
break;
}
case J9CPTYPE_STRING: {
result = (j9object_t)ramCP->value;
if ((NULL == result) && resolve) {
result = vmFuncs->resolveStringRef(currentThread, ramConstantPool, cpIndex, J9_RESOLVE_FLAG_RUNTIME_RESOLVE);
}
break;
}
case J9CPTYPE_INT: {
J9ROMSingleSlotConstantRef *romCP = (J9ROMSingleSlotConstantRef*)J9_ROM_CP_FROM_CP(ramConstantPool) + cpIndex;
result = vm->memoryManagerFunctions->J9AllocateObject(currentThread, J9VMJAVALANGINTEGER_OR_NULL(vm), J9_GC_ALLOCATE_OBJECT_NON_INSTRUMENTABLE);
if (NULL == result) {
vmFuncs->setHeapOutOfMemoryError(currentThread);
goto done;
}
J9VMJAVALANGINTEGER_SET_VALUE(currentThread, result, romCP->data);
break;
}
case J9CPTYPE_FLOAT: {
J9ROMSingleSlotConstantRef *romCP = (J9ROMSingleSlotConstantRef*)J9_ROM_CP_FROM_CP(ramConstantPool) + cpIndex;
result = vm->memoryManagerFunctions->J9AllocateObject(currentThread, J9VMJAVALANGFLOAT_OR_NULL(vm), J9_GC_ALLOCATE_OBJECT_NON_INSTRUMENTABLE);
if (NULL == result) {
vmFuncs->setHeapOutOfMemoryError(currentThread);
goto done;
}
J9VMJAVALANGFLOAT_SET_VALUE(currentThread, result, romCP->data);
break;
}
case J9CPTYPE_LONG: {
J9ROMConstantRef *romCP = (J9ROMConstantRef*)J9_ROM_CP_FROM_CP(ramConstantPool) + cpIndex;
#ifdef J9VM_ENV_LITTLE_ENDIAN
U_64 value = (((U_64)(romCP->slot2)) << 32) | ((U_64)(romCP->slot1));
#else
U_64 value = (((U_64)(romCP->slot1)) << 32) | ((U_64)(romCP->slot2));
#endif
result = vm->memoryManagerFunctions->J9AllocateObject(currentThread, J9VMJAVALANGLONG_OR_NULL(vm), J9_GC_ALLOCATE_OBJECT_NON_INSTRUMENTABLE);
if (NULL == result) {
vmFuncs->setHeapOutOfMemoryError(currentThread);
goto done;
}
J9VMJAVALANGLONG_SET_VALUE(currentThread, result, value);
break;
}
case J9CPTYPE_DOUBLE: {
J9ROMConstantRef *romCP = (J9ROMConstantRef*)J9_ROM_CP_FROM_CP(ramConstantPool) + cpIndex;
#ifdef J9VM_ENV_LITTLE_ENDIAN
U_64 value = (((U_64)(romCP->slot2)) << 32) | ((U_64)(romCP->slot1));
#else
U_64 value = (((U_64)(romCP->slot1)) << 32) | ((U_64)(romCP->slot2));
#endif
result = vm->memoryManagerFunctions->J9AllocateObject(currentThread, J9VMJAVALANGDOUBLE_OR_NULL(vm), J9_GC_ALLOCATE_OBJECT_NON_INSTRUMENTABLE);
if (NULL == result) {
vmFuncs->setHeapOutOfMemoryError(currentThread);
goto done;
}
J9VMJAVALANGDOUBLE_SET_VALUE(currentThread, result, value);
break;
}
case J9CPTYPE_METHOD_TYPE: {
result = (j9object_t)ramCP->value;
if ((NULL == result) && resolve) {
result = vmFuncs->resolveMethodTypeRef(currentThread, ramConstantPool, cpIndex, J9_RESOLVE_FLAG_RUNTIME_RESOLVE);
}
break;
}
case J9CPTYPE_METHODHANDLE: {
result = (j9object_t)ramCP->value;
if ((NULL == result) && resolve) {
result = vmFuncs->resolveMethodHandleRef(currentThread, ramConstantPool, cpIndex, J9_RESOLVE_FLAG_RUNTIME_RESOLVE | J9_RESOLVE_FLAG_NO_CLASS_INIT);
}
break;
}
case J9CPTYPE_CONSTANT_DYNAMIC: {
result = (j9object_t)ramCP->value;
if ((NULL == result) && resolve) {
result = vmFuncs->resolveConstantDynamic(currentThread, ramConstantPool, cpIndex, J9_RESOLVE_FLAG_RUNTIME_RESOLVE);
}
break;
}
} /* switch */
done:
return result;
}
J9Method *
lookupMethod(J9VMThread *currentThread, J9Class *resolvedClass, J9UTF8 *name, J9UTF8 *signature, J9Class *callerClass, UDATA lookupOptions)
{
J9Method *result = NULL;
J9NameAndSignature nas;
J9UTF8 nullSignature = {0};
nas.name = name;
nas.signature = signature;
lookupOptions |= J9_LOOK_DIRECT_NAS;
/* If looking for a MethodHandle polymorphic INL method, allow any caller signature. */
if (isPolymorphicMHMethod(currentThread->javaVM, resolvedClass, name)) {
nas.signature = &nullSignature;
/* Set flag for partial signature lookup. Signature length is already initialized to 0. */
lookupOptions |= J9_LOOK_PARTIAL_SIGNATURE;
}
result = (J9Method*)currentThread->javaVM->internalVMFunctions->javaLookupMethod(currentThread, resolvedClass, (J9ROMNameAndSignature*)&nas, callerClass, lookupOptions);
return result;
}
static void
setCallSiteTargetImpl(J9VMThread *currentThread, jobject callsite, jobject target, bool isVolatile)
{
J9JavaVM *javaVM = currentThread->javaVM;
const J9InternalVMFunctions *vmFuncs = javaVM->internalVMFunctions;
vmFuncs->internalEnterVMFromJNI(currentThread);
if ((NULL == callsite) || (NULL == target)) {
vmFuncs->setCurrentExceptionUTF(currentThread, J9VMCONSTANTPOOL_JAVALANGNULLPOINTEREXCEPTION, NULL);
} else {
j9object_t callsiteObject = J9_JNI_UNWRAP_REFERENCE(callsite);
j9object_t targetObject = J9_JNI_UNWRAP_REFERENCE(target);
J9Class *clazz = J9OBJECT_CLAZZ(currentThread, callsiteObject);
UDATA offset = (UDATA)vmFuncs->instanceFieldOffset(
currentThread,
clazz,
(U_8*)"target",
LITERAL_STRLEN("target"),
(U_8*)"Ljava/lang/invoke/MethodHandle;",
LITERAL_STRLEN("Ljava/lang/invoke/MethodHandle;"),
NULL, NULL, 0);
offset += J9VMTHREAD_OBJECT_HEADER_SIZE(currentThread);
MM_ObjectAccessBarrierAPI objectAccessBarrier = MM_ObjectAccessBarrierAPI(currentThread);
/* Check for MutableCallSite modification. */
J9JITConfig* jitConfig = javaVM->jitConfig;
J9Class *mcsClass = vmFuncs->peekClassHashTable(
currentThread,
javaVM->systemClassLoader,
J9UTF8_DATA(&mutableCallSite),
J9UTF8_LENGTH(&mutableCallSite));
if (!isVolatile /* MutableCallSite uses setTargetNormal(). */
&& (NULL != jitConfig)
&& (NULL != mcsClass)
&& VM_VMHelpers::inlineCheckCast(clazz, mcsClass)
) {
jitConfig->jitSetMutableCallSiteTarget(currentThread, callsiteObject, targetObject);
} else {
/* There are no runtime assumptions to invalidate (either because
* the call site is not a MutableCallSite, or because the JIT
* compiler is not loaded). */
objectAccessBarrier.inlineMixedObjectStoreObject(currentThread, callsiteObject, offset, targetObject, isVolatile);
}
}
vmFuncs->internalExitVMToJNI(currentThread);
}
/**
* static native void init(MemberName self, Object ref);
*
* Initializes a MemberName object using the given ref object.
* see initImpl for detail
* Throw NPE if self or ref is null
* Throw IllegalArgumentException if ref is not a field/method/constructor
*/
void JNICALL
Java_java_lang_invoke_MethodHandleNatives_init(JNIEnv *env, jclass clazz, jobject self, jobject ref)
{
J9VMThread *currentThread = (J9VMThread*)env;
J9JavaVM *vm = currentThread->javaVM;
J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
vmFuncs->internalEnterVMFromJNI(currentThread);
Trc_JCL_java_lang_invoke_MethodHandleNatives_init_Entry(env, self, ref);
if ((NULL == self) || (NULL == ref)) {
vmFuncs->setCurrentExceptionUTF(currentThread, J9VMCONSTANTPOOL_JAVALANGNULLPOINTEREXCEPTION, NULL);
} else {
j9object_t membernameObject = J9_JNI_UNWRAP_REFERENCE(self);
j9object_t refObject = J9_JNI_UNWRAP_REFERENCE(ref);
initImpl(currentThread, membernameObject, refObject);
}
Trc_JCL_java_lang_invoke_MethodHandleNatives_init_Exit(env);
vmFuncs->internalExitVMToJNI(currentThread);
}
/**
* static native void expand(MemberName self);
*
* Given a MemberName object, try to set the uninitialized fields from existing VM metadata.
* Uses VM metadata (vmindex & vmtarget) to set symblic data fields (name & type & defc)
*
* Throws NullPointerException if MemberName object is null.
* Throws IllegalArgumentException if MemberName doesn't contain required data to expand.
* Throws InternalError if the MemberName object contains invalid data or completely uninitialized.
*/
void JNICALL
Java_java_lang_invoke_MethodHandleNatives_expand(JNIEnv *env, jclass clazz, jobject self)
{
J9VMThread *currentThread = (J9VMThread*)env;
J9JavaVM *vm = currentThread->javaVM;
const J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
vmFuncs->internalEnterVMFromJNI(currentThread);
Trc_JCL_java_lang_invoke_MethodHandleNatives_expand_Entry(env, self);
if (NULL == self) {
vmFuncs->setCurrentExceptionUTF(currentThread, J9VMCONSTANTPOOL_JAVALANGNULLPOINTEREXCEPTION, NULL);
} else {
j9object_t membernameObject = J9_JNI_UNWRAP_REFERENCE(self);
jint flags = J9VMJAVALANGINVOKEMEMBERNAME_FLAGS(currentThread, membernameObject);
jlong vmindex = (jlong)J9OBJECT_ADDRESS_LOAD(currentThread, membernameObject, vm->vmindexOffset);
Trc_JCL_java_lang_invoke_MethodHandleNatives_expand_Data(env, membernameObject, flags, vmindex);
if (J9_ARE_ANY_BITS_SET(flags, MN_IS_FIELD)) {
/* For Field MemberName, the clazz and vmindex fields must be set. */
if ((NULL != J9VMJAVALANGINVOKEMEMBERNAME_CLAZZ(currentThread, membernameObject)) && (NULL != (void*)vmindex)) {
J9JNIFieldID *field = (J9JNIFieldID*)vmindex;
/* if name/type field is uninitialized, create j.l.String from ROM field name/sig and store in MN fields. */
if (NULL == J9VMJAVALANGINVOKEMEMBERNAME_NAME(currentThread, membernameObject)) {
J9UTF8 *name = J9ROMFIELDSHAPE_NAME(field->field);
j9object_t nameString = vm->memoryManagerFunctions->j9gc_createJavaLangStringWithUTFCache(currentThread, name);
if (NULL != nameString) {
/* Refetch reference after GC point */
membernameObject = J9_JNI_UNWRAP_REFERENCE(self);
J9VMJAVALANGINVOKEMEMBERNAME_SET_NAME(currentThread, membernameObject, nameString);
}
}
if (NULL == J9VMJAVALANGINVOKEMEMBERNAME_TYPE(currentThread, membernameObject)) {
J9UTF8 *signature = J9ROMFIELDSHAPE_SIGNATURE(field->field);
j9object_t signatureString = vm->memoryManagerFunctions->j9gc_createJavaLangStringWithUTFCache(currentThread, signature);
if (NULL != signatureString) {
/* Refetch reference after GC point */
membernameObject = J9_JNI_UNWRAP_REFERENCE(self);
J9VMJAVALANGINVOKEMEMBERNAME_SET_TYPE(currentThread, membernameObject, signatureString);
}
}
} else {
vmFuncs->setCurrentExceptionUTF(currentThread, J9VMCONSTANTPOOL_JAVALANGILLEGALARGUMENTEXCEPTION, NULL);
}
} else if (J9_ARE_ANY_BITS_SET(flags, MN_IS_METHOD | MN_IS_CONSTRUCTOR)) {
J9Method *method = (J9Method *)(UDATA)J9OBJECT_U64_LOAD(_currentThread, membernameObject, vm->vmtargetOffset);
if (NULL != method) {
/* Retrieve method info using the J9Method and store to MN fields. */
J9ROMMethod *romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(method);
if (NULL == J9VMJAVALANGINVOKEMEMBERNAME_CLAZZ(currentThread, membernameObject)) {
j9object_t newClassObject = J9VM_J9CLASS_TO_HEAPCLASS(J9_CLASS_FROM_METHOD(method));
J9VMJAVALANGINVOKEMEMBERNAME_SET_CLAZZ(currentThread, membernameObject, newClassObject);
}
if (NULL == J9VMJAVALANGINVOKEMEMBERNAME_NAME(currentThread, membernameObject)) {
J9UTF8 *name = J9ROMMETHOD_NAME(romMethod);
j9object_t nameString = vm->memoryManagerFunctions->j9gc_createJavaLangStringWithUTFCache(currentThread, name);
if (NULL != nameString) {
/* Refetch reference after GC point */
membernameObject = J9_JNI_UNWRAP_REFERENCE(self);
J9VMJAVALANGINVOKEMEMBERNAME_SET_NAME(currentThread, membernameObject, nameString);
}
}
if (NULL == J9VMJAVALANGINVOKEMEMBERNAME_TYPE(currentThread, membernameObject)) {
J9UTF8 *signature = J9ROMMETHOD_SIGNATURE(romMethod);
j9object_t signatureString = vm->memoryManagerFunctions->j9gc_createJavaLangStringWithUTFCache(currentThread, signature);
if (NULL != signatureString) {
/* Refetch reference after GC point */
membernameObject = J9_JNI_UNWRAP_REFERENCE(self);
J9VMJAVALANGINVOKEMEMBERNAME_SET_TYPE(currentThread, membernameObject, signatureString);
}
}
} else {
vmFuncs->setCurrentExceptionUTF(currentThread, J9VMCONSTANTPOOL_JAVALANGILLEGALARGUMENTEXCEPTION, NULL);
}
} else {
vmFuncs->setCurrentExceptionUTF(currentThread, J9VMCONSTANTPOOL_JAVALANGINTERNALERROR, NULL);
}
}
Trc_JCL_java_lang_invoke_MethodHandleNatives_expand_Exit(env);
vmFuncs->internalExitVMToJNI(currentThread);
}
/**
* [JDK8] static native MemberName resolve(MemberName self, Class<?> caller)
* throws LinkageError, ClassNotFoundException;
*
* [JDK11] static native MemberName resolve(MemberName self, Class<?> caller,
* boolean speculativeResolve) throws LinkageError, ClassNotFoundException;
*
* [JDK16+] static native MemberName resolve(MemberName self, Class<?> caller, int lookupMode,
* boolean speculativeResolve) throws LinkageError, ClassNotFoundException;
*
* Resolve the method/field represented by the MemberName's symbolic data (name & type & defc)
* with the supplied caller. Store the resolved Method/Field's JNI-id in vmindex, field offset
* or method pointer in vmtarget.
*
* If the speculativeResolve flag is not set, failed resolution will throw the corresponding exception.
*
* If the resolution failed with no exception,
* - Throw NoSuchFieldError for field MemberName issues.
* - Throw NoSuchMethodError for method/constructor MemberName issues.
* - Throw OutOfMemoryError for failure to allocate memory.
* - Throw LinkageError for other issues.
*/
jobject JNICALL
Java_java_lang_invoke_MethodHandleNatives_resolve(
#if JAVA_SPEC_VERSION == 8
JNIEnv *env, jclass clazz, jobject self, jclass caller
#elif JAVA_SPEC_VERSION == 11 /* JAVA_SPEC_VERSION == 8 */
JNIEnv *env, jclass clazz, jobject self, jclass caller,
jboolean speculativeResolve
#elif JAVA_SPEC_VERSION >= 16 /* JAVA_SPEC_VERSION == 11 */
JNIEnv *env, jclass clazz, jobject self, jclass caller,
jint lookupMode, jboolean speculativeResolve
#endif /* JAVA_SPEC_VERSION == 8 */
) {
J9VMThread *currentThread = (J9VMThread*)env;
J9JavaVM *vm = currentThread->javaVM;
const J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
jobject result = NULL;
J9UTF8 *name = NULL;
char nameBuffer[256];
nameBuffer[0] = 0;
J9UTF8 *signature = NULL;
char signatureBuffer[256];
signatureBuffer[0] = 0;
PORT_ACCESS_FROM_JAVAVM(vm);
vmFuncs->internalEnterVMFromJNI(currentThread);
#if JAVA_SPEC_VERSION >= 11
Trc_JCL_java_lang_invoke_MethodHandleNatives_resolve_Entry(env, self, caller, (speculativeResolve ? "true" : "false"));
#else /* JAVA_SPEC_VERSION >= 11 */
Trc_JCL_java_lang_invoke_MethodHandleNatives_resolve_Entry(env, self, caller, "false");
#endif /* JAVA_SPEC_VERSION >= 11 */