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exceptionsupport.c
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/*******************************************************************************
* Copyright (c) 1991, 2020 IBM Corp. and others
*
* 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] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#include <string.h>
#include <stdlib.h>
#include "j9cfg.h"
#include "j9consts.h"
#include "omrgcconsts.h"
#include "j9port.h"
#include "j9protos.h"
#include "j9vmnls.h"
#include "objhelp.h"
#include "rommeth.h"
#include "stackwalk.h"
#include "ut_j9vm.h"
#include "vm_internal.h"
#include "ute.h"
/* Default message if no NLS message supplied, or cannot be looked up */
#define NATIVE_MEMORY_OOM_MSG "native memory exhausted"
static void internalSetCurrentExceptionWithCause(J9VMThread *currentThread, UDATA exceptionNumber, UDATA *detailMessage, const char *utfMessage, j9object_t cause);
/* Helper macro for ALWAYS_TRIGGER_J9HOOK_VM_METHOD_RETURN */
#ifdef J9VM_INTERP_NATIVE_SUPPORT
#define HOOK_METHOD_TYPE(walkState) ( ( (walkState)->jitInfo == NULL ) ? 0 : 1 )
#else
#define HOOK_METHOD_TYPE(walkState) ( 0 )
#endif
void
setCurrentExceptionUTF(J9VMThread * vmThread, UDATA exceptionNumber, const char * detailUTF)
{
j9object_t detailString = NULL;
Trc_VM_setCurrentExceptionUTF_Entry(vmThread, exceptionNumber, detailUTF);
vmThread->currentException = NULL;
if ((detailUTF != NULL) && (NULL != J9VMJAVALANGSTRING_OR_NULL(vmThread->javaVM))){
detailString = vmThread->javaVM->memoryManagerFunctions->j9gc_createJavaLangString(vmThread, (U_8 *) detailUTF, (UDATA) strlen(detailUTF), 0);
}
if (vmThread->currentException == NULL) {
setCurrentExceptionWithUtfCause(vmThread, exceptionNumber, (UDATA *) detailString, detailUTF, NULL);
} else {
Trc_VM_setCurrentExceptionUTF_StringAllocFailed(vmThread);
}
Trc_VM_setCurrentExceptionUTF_Exit(vmThread);
}
void
setCurrentExceptionNLS(J9VMThread * vmThread, UDATA exceptionNumber, U_32 moduleName, U_32 messageNumber)
{
PORT_ACCESS_FROM_VMC(vmThread);
const char * msg;
msg = OMRPORT_FROM_J9PORT(PORTLIB)->nls_lookup_message(OMRPORT_FROM_J9PORT(PORTLIB), J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, moduleName, messageNumber, NULL);
setCurrentExceptionUTF(vmThread, exceptionNumber, msg);
}
void
prepareExceptionUsingClassName(J9VMThread *vmThread, const char *exceptionClassName)
{
J9Class *exceptionClass = NULL;
j9object_t exception = NULL;
prepareForExceptionThrow(vmThread);
exceptionClass = internalFindClassUTF8(
vmThread,
(U_8 *)exceptionClassName,
strlen(exceptionClassName),
vmThread->javaVM->systemClassLoader,
J9_FINDCLASS_FLAG_THROW_ON_FAIL);
/* internalFindClassUTF8 will set an exception on failure. */
if (J9_EXPECTED(NULL != exceptionClass)) {
exception = vmThread->javaVM->memoryManagerFunctions->J9AllocateObject(
vmThread,
exceptionClass,
J9_GC_ALLOCATE_OBJECT_NON_INSTRUMENTABLE);
if (J9_UNEXPECTED(NULL == exception)) {
setHeapOutOfMemoryError(vmThread);
} else {
vmThread->currentException = exception;
vmThread->privateFlags |= J9_PRIVATE_FLAGS_REPORT_EXCEPTION_THROW;
}
}
}
/**
* Creates exception with nls message; substitutes string values into error message.
*
* @param vmThread current VM thread
* @param nlsModule nls module name
* @param nlsID nls number
* @param exceptionIndex index to exception in vm constant pool
* @param ... arguments to be substituted into error message
*/
void
setCurrentExceptionNLSWithArgs(J9VMThread * vmThread, U_32 nlsModule, U_32 nlsID, UDATA exceptionIndex, ...)
{
va_list stringArgList;
UDATA msgCharLength = 0;
const char *nlsMsgFormat = NULL;
char *msgChars = NULL;
PORT_ACCESS_FROM_VMC(vmThread);
OMRPORT_ACCESS_FROM_J9PORT(PORTLIB);
nlsMsgFormat = omrnls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE,
nlsModule,
nlsID,
"");
va_start(stringArgList, exceptionIndex);
msgCharLength = j9str_vprintf(NULL, 0, nlsMsgFormat, stringArgList);
va_end(stringArgList);
msgChars = (char *)j9mem_allocate_memory(msgCharLength, J9MEM_CATEGORY_VM);
if (NULL != msgChars) {
va_start(stringArgList, exceptionIndex);
j9str_vprintf(msgChars, msgCharLength, nlsMsgFormat, stringArgList);
va_end(stringArgList);
}
setCurrentExceptionUTF(vmThread, exceptionIndex, msgChars);
j9mem_free_memory(msgChars);
}
static UDATA
decompStackHeadSearch(J9VMThread *currentThread, J9StackWalkState *walkState)
{
if (((UDATA *) walkState->userData1) == walkState->bp) {
/* We're at the catch frame */
return J9_STACKWALK_STOP_ITERATING;
}
return J9_STACKWALK_KEEP_ITERATING;
}
/**
* \brief Correct the decompilation stack of the passed in walkState
*
* @param currentThread current thread
* @param walkState stack walk state to be fixed
* @param rewalkAllWalkedFrames set to true in order to rewalk the same amount of frames as upto the frame of the exceptionHandlerSearch that called us
* @return none
*
* The <code>exceptionHandlerSearch</code> function issues various events that
* might call user callbacks such as jvmti pop frame event. Prior to the
* callback we release vm access which in turn might cause our thread being
* marked for decompilation (for example if a jvmti agent single steps or sets/removes
* a breakpoint). The passed in walkState->decompilationStack will not always be valid
* when we come back.
*
* if (rewalkAllWalkedFrames == FALSE)
* This function walks the top two frames to determine the right decompilation stack head
* and use it to update the passed in walkState->decompilationStack. We do this when we had
* to dropToCurrentFrame prior to issuing an event (read: releasing access which might result
* in class loading, calling out to any jvmti agent which expect the stack to be in the correct shape,
* hence we dropToCurrentFrame so that we match what they expect to see instead of having any
* leftover/special frames ontop). We only need to walk 2 frames to figure out the correct
* decompilation side-stack head.
* else
* In case that the exceptionHandlerSearch stack walk iterator was used for a stack walk ment
* to simply walk the stack and find the catch frame (ie no frame dropping involved). Once we reacquire
* access, we must re-walk the stack for at least as many frames as to reach the catch frame.
*
*/
static void
syncDecompilationStackAfterReleasingVMAccess(J9VMThread *currentThread, J9StackWalkState *walkState, UDATA rewalkAllWalkedFrames)
{
#ifdef J9VM_JIT_FULL_SPEED_DEBUG
if (J9_FSD_ENABLED(currentThread->javaVM)) {
J9StackWalkState ws;
/* Stack walk 2 frames in order to initialize ws.decompilationStack */
ws.skipCount = 0;
ws.walkThread = walkState->walkThread;
if (rewalkAllWalkedFrames) {
/* Rewalk all frames walked during exception handler search */
ws.frameWalkFunction = decompStackHeadSearch;
ws.userData1 = (void *) walkState->bp;
ws.flags = J9_STACKWALK_ITERATE_FRAMES | J9_STACKWALK_SKIP_INLINES | J9_STACKWALK_VISIBLE_ONLY;
} else {
/* Walk only the top frame */
ws.maxFrames = 2;
ws.flags = J9_STACKWALK_COUNT_SPECIFIED ;
}
currentThread->javaVM->walkStackFrames(currentThread, &ws);
/* Update the decomp stack of the passed in walk state with the most upto
* date head record */
walkState->decompilationStack = ws.decompilationStack;
}
#endif
}
/*
* Helper function - check if method has been enabled for tracing
* @return non-zero if the method tracing is enabled, otherwise 0 is returned
*/
UDATA
methodBeingTraced(J9JavaVM *vm, J9Method *method)
{
UDATA rc = FALSE;
if (vm->extendedRuntimeFlags & J9_EXTENDED_RUNTIME_METHOD_TRACE_ENABLED) {
U_8 *pmethodflags = fetchMethodExtendedFlagsPointer(method);
if (J9_RAS_IS_METHOD_TRACED(*pmethodflags)) {
rc = TRUE;
}
}
return rc;
}
/*
Helper function, called for each stack frame. Assumptions:
1) current thread and walk state are passed as parameters.
2) walkState->userData1 is a flags field that controls the walk (input)
3) walkState->userData2 is the handler PC (output, not filled in for JNI catches)
4) walkState->userData3 is a cookie describing the frame type (output)
5) walkState->userData4 is the thrown class (input)
*/
UDATA
exceptionHandlerSearch(J9VMThread *currentThread, J9StackWalkState *walkState)
{
J9JavaVM * vm = walkState->walkThread->javaVM;
Trc_VM_exceptionHandlerSearch_Entry(currentThread);
#ifdef J9VM_INTERP_NATIVE_SUPPORT
if (walkState->jitInfo != NULL) {
if (vm->jitExceptionHandlerSearch(currentThread, walkState) == J9_STACKWALK_STOP_ITERATING) {
Trc_VM_exceptionHandlerSearch_Exit(currentThread, J9_STACKWALK_STOP_ITERATING);
return J9_STACKWALK_STOP_ITERATING;
}
} else
#endif
/* Special frames (natives in particular) do not handle exceptions */
if (!IS_SPECIAL_FRAME_PC(walkState->pc)) {
J9ROMMethod * romMethod;
if (walkState->pc[0] == 0xFF) { /* impdep2 = 0xFF - indicates a JNI call-in frame */
walkState->userData3 = (void *) J9_EXCEPT_SEARCH_JNI_HANDLER;
Trc_VM_exceptionHandlerSearch_Exit(currentThread, J9_STACKWALK_STOP_ITERATING);
return J9_STACKWALK_STOP_ITERATING;
}
romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(walkState->method);
if (J9ROMMETHOD_HAS_EXCEPTION_INFO(romMethod)) {
{
J9ExceptionInfo * eData = J9_EXCEPTION_DATA_FROM_ROM_METHOD(romMethod);
UDATA ranges = eData->catchCount;
if (ranges != 0) {
J9ExceptionHandler * handlerCursor = (J9ExceptionHandler *) (eData + 1);
U_32 deltaPC = (U_32) walkState->bytecodePCOffset;
do {
if ((deltaPC >= handlerCursor->startPC) && (deltaPC < handlerCursor->endPC)) {
if (isExceptionTypeCaughtByHandler(currentThread, walkState->userData4, walkState->constantPool, handlerCursor->exceptionClassIndex, walkState) != 0) {
U_32 handlerPC = handlerCursor->handlerPC;
walkState->userData1 = (void *)(UDATA) handlerPC;
walkState->userData2 = J9_BYTECODE_START_FROM_ROM_METHOD(romMethod) + handlerPC;
walkState->userData3 = (void *)(UDATA) J9_EXCEPT_SEARCH_JAVA_HANDLER;
Trc_VM_exceptionHandlerSearch_Exit(currentThread, J9_STACKWALK_STOP_ITERATING);
return J9_STACKWALK_STOP_ITERATING;
}
}
++handlerCursor;
} while (--ranges != 0);
}
}
}
}
/* Exception not handled in this frame */
if ((((UDATA) walkState->userData1) & J9_EXCEPT_SEARCH_NO_UNWIND) == 0) {
J9StackWalkState tempWalkState;
/* Report the method return and frame pop hooks if necessary */
if (IS_SPECIAL_FRAME_PC(walkState->pc)) {
if (walkState->pc == (U_8 *) J9SF_FRAME_TYPE_JNI_NATIVE_METHOD) {
#if defined(J9VM_INTERP_NATIVE_SUPPORT)
if ((walkState->frameFlags & J9_STACK_FLAGS_JIT_JNI_CALL_OUT_FRAME) == 0)
#endif
{
UDATA traced = methodBeingTraced(vm, walkState->method);
UDATA hooked = J9_EVENT_IS_HOOKED(vm->hookInterface, J9HOOK_VM_NATIVE_METHOD_RETURN);
if (traced || hooked ) {
/* Do not drop to current frame here:
*
* 1) The native method is guaranteed to be the top frame
* 2) The stack must be left alone to ensure consistency of the JNI refs and stack frame flags
*/
PUSH_OBJECT_IN_SPECIAL_FRAME(currentThread, walkState->restartException);
tempWalkState.previous = currentThread->stackWalkState;
currentThread->stackWalkState = &tempWalkState;
if (traced) {
UTSI_TRACEMETHODEXIT_FROMVM(vm, currentThread, walkState->method, walkState->restartException, NULL, 0);
}
if (hooked) {
ALWAYS_TRIGGER_J9HOOK_VM_NATIVE_METHOD_RETURN(vm->hookInterface, currentThread, walkState->method, TRUE, NULL, NULL);
}
currentThread->stackWalkState = tempWalkState.previous;
walkState->restartException = POP_OBJECT_IN_SPECIAL_FRAME(currentThread);
#ifdef J9VM_JIT_FULL_SPEED_DEBUG
walkState->decompilationStack = walkState->walkThread->decompilationStack;
#endif
}
}
/* The stack will be dropped before any further events are reported or classes are loaded,
* so the JNI cleanup code must be run before continuing the unwind. Note that this can happen
* only once per walk, since the exception will be caught by a JNI call-in frame before another JNI
* native method frame could be seen.
*/
returnFromJNI(currentThread, walkState->bp);
}
} else {
UDATA traced = methodBeingTraced(vm, walkState->method);
UDATA hooked = J9_EVENT_IS_HOOKED(vm->hookInterface, J9HOOK_VM_NATIVE_METHOD_RETURN);
if (traced || hooked) {
walkState->dropToCurrentFrame(walkState);
PUSH_OBJECT_IN_SPECIAL_FRAME(currentThread, walkState->restartException);
tempWalkState.previous = currentThread->stackWalkState;
currentThread->stackWalkState = &tempWalkState;
if (traced) {
UTSI_TRACEMETHODEXIT_FROMVM(vm, currentThread, walkState->method, walkState->restartException, NULL, HOOK_METHOD_TYPE(walkState) );
}
if (hooked) {
ALWAYS_TRIGGER_J9HOOK_VM_METHOD_RETURN(vm->hookInterface, currentThread, walkState->method, TRUE, NULL, HOOK_METHOD_TYPE(walkState) );
}
currentThread->stackWalkState = tempWalkState.previous;
walkState->restartException = POP_OBJECT_IN_SPECIAL_FRAME(currentThread);
syncDecompilationStackAfterReleasingVMAccess(currentThread, walkState, FALSE);
}
#ifdef J9VM_INTERP_NATIVE_SUPPORT
if (walkState->jitInfo != NULL) {
#ifdef J9VM_JIT_FULL_SPEED_DEBUG
J9JITDecompilationInfo *decompilationRecord = walkState->decompilationRecord;
if ((NULL != decompilationRecord) && (decompilationRecord->reason & JITDECOMP_FRAME_POP_NOTIFICATION)) {
if (J9_EVENT_IS_HOOKED(vm->hookInterface, J9HOOK_VM_FRAME_POP)) {
walkState->dropToCurrentFrame(walkState);
PUSH_OBJECT_IN_SPECIAL_FRAME(currentThread, walkState->restartException);
tempWalkState.previous = currentThread->stackWalkState;
currentThread->stackWalkState = &tempWalkState;
ALWAYS_TRIGGER_J9HOOK_VM_FRAME_POP(vm->hookInterface, currentThread, walkState->method, TRUE);
currentThread->stackWalkState = tempWalkState.previous;
walkState->restartException = POP_OBJECT_IN_SPECIAL_FRAME(currentThread);
syncDecompilationStackAfterReleasingVMAccess(currentThread, walkState, FALSE);
}
}
#endif
} else
#endif
{
if (*walkState->bp & J9SF_A0_REPORT_FRAME_POP_TAG) {
if (J9_EVENT_IS_HOOKED(vm->hookInterface, J9HOOK_VM_FRAME_POP)) {
walkState->dropToCurrentFrame(walkState);
PUSH_OBJECT_IN_SPECIAL_FRAME(currentThread, walkState->restartException);
tempWalkState.previous = currentThread->stackWalkState;
currentThread->stackWalkState = &tempWalkState;
ALWAYS_TRIGGER_J9HOOK_VM_FRAME_POP(vm->hookInterface, currentThread, walkState->method, TRUE);
currentThread->stackWalkState = tempWalkState.previous;
walkState->restartException = POP_OBJECT_IN_SPECIAL_FRAME(currentThread);
syncDecompilationStackAfterReleasingVMAccess(currentThread, walkState, FALSE);
}
}
}
{
J9ROMMethod * romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(walkState->method);
/* Exit the monitor for synchronized methods */
if (romMethod->modifiers & J9AccSynchronized) {
j9object_t syncObject;
#ifdef J9VM_INTERP_NATIVE_SUPPORT
if (walkState->jitInfo != NULL) {
if (romMethod->modifiers & J9AccStatic) {
J9Class *syncClass = walkState->constantPool->ramClass;
syncObject = J9VM_J9CLASS_TO_HEAPCLASS(syncClass);
} else {
syncObject = *((j9object_t*) walkState->arg0EA);
}
} else
#endif
{
syncObject = (j9object_t) (walkState->bp[1]);
}
if (objectMonitorExit(currentThread, syncObject) != 0) {
j9object_t ime;
J9StackWalkState tempWalkState;
walkState->dropToCurrentFrame(walkState);
PUSH_OBJECT_IN_SPECIAL_FRAME(currentThread, walkState->restartException);
tempWalkState.previous = currentThread->stackWalkState;
currentThread->stackWalkState = &tempWalkState;
setCurrentException(currentThread, J9VMCONSTANTPOOL_JAVALANGILLEGALMONITORSTATEEXCEPTION, NULL);
currentThread->stackWalkState = tempWalkState.previous;
ime = currentThread->currentException;
walkState->restartException = POP_OBJECT_IN_SPECIAL_FRAME(currentThread);
if (ime != NULL) {
currentThread->currentException = NULL;
walkState->restartException = ime;
walkState->userData4 = J9OBJECT_CLAZZ(currentThread, ime);
}
syncDecompilationStackAfterReleasingVMAccess(currentThread, walkState, FALSE);
}
}
}
}
}
Trc_VM_exceptionHandlerSearch_Exit(currentThread, J9_STACKWALK_KEEP_ITERATING);
return J9_STACKWALK_KEEP_ITERATING;
}
UDATA
isExceptionTypeCaughtByHandler(J9VMThread *currentThread, J9Class *thrownExceptionClass, J9ConstantPool *constantPool, UDATA handlerIndex, J9StackWalkState *walkState)
{
J9Class * caughtExceptionClass;
UDATA caughtDepth;
UDATA thrownDepth;
/* Handler index 0 means catch all */
if (handlerIndex == 0) {
return TRUE;
}
/* Get the caught class - might not be loaded yet */
caughtExceptionClass = ((J9RAMClassRef *) (constantPool + handlerIndex))->value;
if (caughtExceptionClass == NULL) {
J9StackWalkState tempWalkState;
if ((((UDATA) walkState->userData1) & J9_EXCEPT_SEARCH_NO_UNWIND) == 0) {
walkState->dropToCurrentFrame(walkState);
}
PUSH_OBJECT_IN_SPECIAL_FRAME(currentThread, walkState->restartException);
tempWalkState.previous = currentThread->stackWalkState;
currentThread->stackWalkState = &tempWalkState;
caughtExceptionClass = resolveClassRef(currentThread, constantPool, handlerIndex, J9_RESOLVE_FLAG_RUNTIME_RESOLVE);
currentThread->stackWalkState = tempWalkState.previous;
walkState->restartException = POP_OBJECT_IN_SPECIAL_FRAME(currentThread);
if ((((UDATA) walkState->userData1) & J9_EXCEPT_SEARCH_NO_UNWIND) == 0) {
syncDecompilationStackAfterReleasingVMAccess(currentThread, walkState, FALSE);
} else {
syncDecompilationStackAfterReleasingVMAccess(currentThread, walkState, TRUE);
}
/* If we were unable to load the class, then we can only say that the exception is not caught */
if (caughtExceptionClass == NULL) {
currentThread->currentException = NULL;
return FALSE;
}
}
/* See if thrown class is compatible with caught class */
if (caughtExceptionClass == thrownExceptionClass) {
return TRUE;
}
caughtDepth = J9CLASS_DEPTH(caughtExceptionClass);
thrownDepth = J9CLASS_DEPTH(thrownExceptionClass);
if (thrownDepth <= caughtDepth) {
return FALSE;
}
return thrownExceptionClass->superclasses[caughtDepth] == caughtExceptionClass;
}
void
setCurrentException(J9VMThread *currentThread, UDATA exceptionNumber, UDATA *detailMessage)
{
setCurrentExceptionWithUtfCause(currentThread, exceptionNumber, detailMessage, NULL, NULL);
}
/**
* Creates exception with its cause and detailed message
*
* @param currentThread
* @param exceptionNumber
* @param detailMessage
* @param cause
*
*/
static void
internalSetCurrentExceptionWithCause(J9VMThread *currentThread, UDATA exceptionNumber, UDATA *detailMessage, const char *utfMessage, j9object_t cause)
{
UDATA index = 0;
UDATA * preservedMessage = NULL;
UDATA resetOutOfMemory = 0;
j9object_t exception = NULL;
J9Class * exceptionClass = NULL;
UDATA constructorIndex = 0;
UDATA exceptionFlags = 0;
index = exceptionNumber & J9_EXCEPTION_INDEX_MASK;
constructorIndex = exceptionNumber & J9_EX_CTOR_TYPE_MASK;
Trc_VM_setCurrentException_Entry(currentThread, index, constructorIndex, detailMessage);
/* Clear the current exception so that it doesn't get re-triggered while loading more exception classes */
currentThread->currentException = NULL;
currentThread->privateFlags &= ~J9_PRIVATE_FLAGS_REPORT_EXCEPTION_THROW;
/* Preserve cause object */
PUSH_OBJECT_IN_SPECIAL_FRAME(currentThread, cause);
/* Preserve the detail message object (if it is an object) */
switch (constructorIndex) {
case J9_EX_CTOR_INT:
case J9_EX_CTOR_CLASS_CLASS:
preservedMessage = NULL;
break;
default:
preservedMessage = detailMessage;
break;
}
PUSH_OBJECT_IN_SPECIAL_FRAME(currentThread, (j9object_t) preservedMessage);
if (J9VMCONSTANTPOOL_JAVALANGUNSUPPORTEDCLASSVERSIONERROR == index) {
J9JavaVM *vm = currentThread->javaVM;
if (J9_ARE_NO_BITS_SET(vm->extendedRuntimeFlags, J9_EXTENDED_RUNTIME_CLASS_OBJECT_ASSIGNED)) {
/* This is JVM startup stage, exit with message now. */
PORT_ACCESS_FROM_JAVAVM(vm);
j9tty_err_printf(PORTLIB, "%s\n", utfMessage);
goto done;
}
}
#ifdef J9VM_INTERP_GROWABLE_STACKS
/* If we are throwing StackOverflowError for the first time in this thread, grow the stack once more */
if (index == J9VMCONSTANTPOOL_JAVALANGSTACKOVERFLOWERROR) {
J9JavaVM * vm = currentThread->javaVM;
UDATA stackSize = vm->stackSize + OMR_MAX(J9_STACK_OVERFLOW_AND_HEADER_SIZE, vm->stackSizeIncrement);
if (currentThread->stackObject->size < stackSize) {
growJavaStack(currentThread, stackSize);
}
if (J9_ARE_NO_BITS_SET(currentThread->privateFlags, J9_PRIVATE_FLAGS_STACK_OVERFLOW)) {
exceptionFlags |= J9_PRIVATE_FLAGS_STACK_OVERFLOW;
}
}
#endif
/* Keep track of the fact that an exception is being constructed */
if (J9_ARE_NO_BITS_SET(currentThread->privateFlags, J9_PRIVATE_FLAGS_CONSTRUCTING_EXCEPTION)) {
exceptionFlags |= J9_PRIVATE_FLAGS_CONSTRUCTING_EXCEPTION;
}
currentThread->privateFlags |= exceptionFlags;
/* Handle OutOfMemory specially
*
* To prevent recursion of OOM being called, following three states are in effect.
*
* OOM_STATE_1 = First OOM. Construct OOM. Set currentThread->privateFlags |= J9_PRIVATE_FLAGS_OUT_OF_MEMORY
* OOM_STATE_2 = Already throwing OOM. Use cached OOM and call exception constructor (internalSendExceptionConstructor)
* and set currentThread->privateFlags |= J9_PRIVATE_FLAGS_FINAL_CALL_OUT_OF_MEMORY
* OOM_STATE_3 = Already throwing cached OOM. Skip calling the constructor and just throw the exception.
*
*/
resetOutOfMemory = FALSE;
currentThread->privateFlags &= ~J9_PRIVATE_FLAGS_FILL_EXISTING_TRACE;
if (index == J9VMCONSTANTPOOL_JAVALANGOUTOFMEMORYERROR) {
J9JavaVM * vm = currentThread->javaVM;
/* If java.lang.Class has not yet been loaded, don't try to allocate the exception - just bail */
if (J9VMJAVALANGCLASS_OR_NULL(vm) == NULL) {
Trc_VM_setCurrentException_ClassNotLoaded(currentThread);
Assert_VM_fatalOOM();
/* Execution never reaches this point */
}
if (J9_EVENT_IS_HOOKED(vm->hookInterface, J9HOOK_VM_RESOURCE_EXHAUSTED)) {
UDATA resourceTypes;
/* The caller might have specified OOM exception type bits */
resourceTypes = exceptionNumber & J9_EX_OOM_TYPE_MASK;
/* No bits specified, we are dealing with with a regular Java Heap OOM */
if (resourceTypes == 0) {
resourceTypes = J9_EX_OOM_JAVA_HEAP;
}
ALWAYS_TRIGGER_J9HOOK_VM_RESOURCE_EXHAUSTED(vm->hookInterface, currentThread, resourceTypes, utfMessage);
}
/* OOM_STATE_2 : If we're already throwing OutOfMemory, use the cached Throwable */
if (currentThread->privateFlags & J9_PRIVATE_FLAGS_OUT_OF_MEMORY) {
j9object_t walkback;
throwOutOfMemory:
exception = currentThread->outOfMemoryError;
if (exception == NULL) {
Trc_VM_setCurrentException_NoCachedOOM(currentThread);
Assert_VM_fatalOOM();
/* Execution never reaches this point */
}
/* Check whether we are in OOM_STATE_2 or OOM_STATE_3 */
if (currentThread->privateFlags & J9_PRIVATE_FLAGS_FINAL_CALL_OUT_OF_MEMORY) {
/* OOM_STATE_3 */
currentThread->currentException = exception;
DROP_OBJECT_IN_SPECIAL_FRAME(currentThread); /* preservedMessage */
DROP_OBJECT_IN_SPECIAL_FRAME(currentThread); /* cause */
goto done;
}
/* OOM_STATE_2 */
currentThread->privateFlags |= J9_PRIVATE_FLAGS_FINAL_CALL_OUT_OF_MEMORY;
/* If there's a walkback object in the Throwable, zero it */
exceptionClass = J9OBJECT_CLAZZ(currentThread, exception);
walkback = J9VMJAVALANGTHROWABLE_WALKBACK(currentThread, exception);
if (walkback != NULL) {
U_32 i;
for (i = 0; i < J9INDEXABLEOBJECT_SIZE(currentThread, walkback); i++) {
J9JAVAARRAYOFUDATA_STORE(currentThread, walkback, i, 0);
}
currentThread->privateFlags |= J9_PRIVATE_FLAGS_FILL_EXISTING_TRACE;
}
goto sendConstructor;
}
/* OOM_STATE_1 */
currentThread->privateFlags |= J9_PRIVATE_FLAGS_OUT_OF_MEMORY;
resetOutOfMemory = TRUE;
}
/* Get the class of the exception, loading the class if necessary.
* Fetch known class fatal exits if the class cannot be found.
*/
exceptionClass = internalFindKnownClass(currentThread, index, J9_FINDKNOWNCLASS_FLAG_INITIALIZE | J9_FINDKNOWNCLASS_FLAG_NON_FATAL);
if (exceptionClass == NULL) {
Trc_VM_setCurrentException_UnableToLoadExceptionClass(currentThread);
DROP_OBJECT_IN_SPECIAL_FRAME(currentThread); /* preservedMessage */
DROP_OBJECT_IN_SPECIAL_FRAME(currentThread); /* cause */
/* Exception class could not be loaded/initialized - there should be an exception pending now, if not, throw OOM */
if (currentThread->currentException == NULL) {
Trc_VM_setCurrentException_NoExceptionPending(currentThread);
setHeapOutOfMemoryError(currentThread);
}
goto done;
}
/* Make an instance of the exception class */
exception = currentThread->javaVM->memoryManagerFunctions->J9AllocateObject(
currentThread, exceptionClass, J9_GC_ALLOCATE_OBJECT_NON_INSTRUMENTABLE);
if (exception == NULL) {
Trc_VM_setCurrentException_UnableToAllocateException(currentThread);
goto throwOutOfMemory;
}
/* Construct the exception */
sendConstructor:
switch (constructorIndex) {
case J9_EX_CTOR_INT:
case J9_EX_CTOR_CLASS_CLASS:
break;
default:
detailMessage = *((UDATA **) (currentThread->sp));
break;
}
/* Look up and call the exception constructor */
*((j9object_t*) (currentThread->sp)) = exception;
internalSendExceptionConstructor(currentThread, exceptionClass, exception, (j9object_t) detailMessage, constructorIndex);
currentThread->privateFlags &= ~J9_PRIVATE_FLAGS_FILL_EXISTING_TRACE;
exception = POP_OBJECT_IN_SPECIAL_FRAME(currentThread); /* preservedMessage */
/* Retrieve the cause, and if it's not NULL, set it in the exception */
cause = POP_OBJECT_IN_SPECIAL_FRAME(currentThread); /* cause */
if (currentThread->currentException == NULL) {
if (cause != NULL) {
sendInitCause(currentThread, (j9object_t) exception, cause);
exception = (j9object_t) currentThread->returnValue; /* initCause returns the receiver */
}
} else {
Trc_VM_setCurrentException_ExceptionDuringConstructor(currentThread);
}
/* If no exception occurred during construction, report systhrow for the new exception */
if (currentThread->currentException == NULL) {
j9object_t localException = (j9object_t) exception;
TRIGGER_J9HOOK_VM_EXCEPTION_SYSTHROW(currentThread->javaVM->hookInterface, currentThread, localException);
currentThread->currentException = localException;
currentThread->privateFlags |= J9_PRIVATE_FLAGS_REPORT_EXCEPTION_THROW;
} else {
Trc_VM_setCurrentException_ExceptionDuringConstructor(currentThread);
}
done:
/* Reset the recursion-prevention flags */
if (resetOutOfMemory) {
currentThread->privateFlags &= ~J9_PRIVATE_FLAGS_OUT_OF_MEMORY;
currentThread->privateFlags &= ~J9_PRIVATE_FLAGS_FINAL_CALL_OUT_OF_MEMORY;
}
currentThread->privateFlags &= ~exceptionFlags;
Trc_VM_setCurrentException_Exit(currentThread);
}
typedef struct J9RedirectedSetCurrentExceptionWithCauseArgs {
J9VMThread *currentThread;
UDATA exceptionNumber;
UDATA *detailMessage;
const char *utfMessage;
j9object_t cause;
} J9RedirectedSetCurrentExceptionWithCauseArgs;
/**
* This is an helper function to call internalSetCurrentExceptionWithCause indirectly from gpProtectAndRun function.
*
* @param entryArg Argument structure (J9RedirectedSetCurrentExceptionWithCauseArgs).
*/
static UDATA
gpProtectedSetCurrentExceptionWithCause(void *entryArg)
{
J9RedirectedSetCurrentExceptionWithCauseArgs *args = (J9RedirectedSetCurrentExceptionWithCauseArgs *) entryArg;
internalSetCurrentExceptionWithCause(args->currentThread, args->exceptionNumber, args->detailMessage, args->utfMessage, args->cause);
return 0; /* return value required to conform to port library definition */
}
/**
* This function makes sure that call to "internalSetCurrentExceptionWithCause" is gpProtected
*
* @param currentThread
* @param exceptionNumber
* @param detailMessage
* @param cause
*
*/
void
setCurrentExceptionWithCause(J9VMThread *currentThread, UDATA exceptionNumber, UDATA *detailMessage, j9object_t cause)
{
setCurrentExceptionWithUtfCause(currentThread, exceptionNumber, detailMessage, NULL, cause);
}
void
setCurrentExceptionWithUtfCause(J9VMThread *currentThread, UDATA exceptionNumber, UDATA *detailMessage, const char *utfMessage, j9object_t cause)
{
if (currentThread->gpProtected) {
internalSetCurrentExceptionWithCause(currentThread, exceptionNumber, detailMessage, utfMessage, cause);
} else {
J9RedirectedSetCurrentExceptionWithCauseArgs handlerArgs;
handlerArgs.currentThread = currentThread;
handlerArgs.exceptionNumber = exceptionNumber;
handlerArgs.detailMessage = detailMessage;
handlerArgs.utfMessage = utfMessage;
handlerArgs.cause = cause;
gpProtectAndRun(gpProtectedSetCurrentExceptionWithCause, (JNIEnv *)currentThread, &handlerArgs);
}
}
j9object_t
walkStackForExceptionThrow(J9VMThread * currentThread, j9object_t exception, UDATA walkOnly)
{
J9StackWalkState * walkState = currentThread->stackWalkState;
/* NOTE: This helper must use the current thread's current walk state, not a C stack-allocated one */
walkState->skipCount = 0;
walkState->frameWalkFunction = exceptionHandlerSearch;
walkState->userData1 = (void *)(UDATA) (walkOnly ? J9_EXCEPT_SEARCH_NO_UNWIND : 0);
walkState->userData2 = NULL;
walkState->userData3 = (void *)(UDATA) J9_EXCEPT_SEARCH_NO_HANDLER;
walkState->userData4 = J9OBJECT_CLAZZ(currentThread, exception);
walkState->restartException = exception;
walkState->walkThread = currentThread;
walkState->flags = J9_STACKWALK_ITERATE_FRAMES | J9_STACKWALK_SKIP_INLINES | J9_STACKWALK_VISIBLE_ONLY;
if (!walkOnly) {
walkState->flags |= (J9_STACKWALK_INCLUDE_CALL_IN_FRAMES | J9_STACKWALK_INCLUDE_NATIVES | J9_STACKWALK_MAINTAIN_REGISTER_MAP);
}
/* PR 81484: Clear jitStackFrameFlags before the walk.
* 1) It is not used by the stack walker.
* 2) It could affect code that runs to load exception classes during the walk.
*/
currentThread->jitStackFrameFlags = 0;
currentThread->javaVM->walkStackFrames(currentThread, walkState);
return walkState->restartException;
}
void
setClassCastException(J9VMThread *currentThread, J9Class * instanceClass, J9Class * castClass)
{
J9ClassCastParms detailMessage;
detailMessage.instanceClass = instanceClass;
detailMessage.castClass = castClass;
setCurrentException(currentThread, J9_EX_CTOR_CLASS_CLASS + J9VMCONSTANTPOOL_JAVALANGCLASSCASTEXCEPTION, (UDATA *) &detailMessage);
}
void
setClassLoadingConstraintError(J9VMThread * currentThread, J9ClassLoader * initiatingLoader, J9Class * existingClass)
{
PORT_ACCESS_FROM_VMC(currentThread);
char * msg = NULL;
const char * nlsMessage = j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_VM_LOADING_CONSTRAINT_VIOLATION, NULL);
if (nlsMessage != NULL) {
j9object_t initiatingLoaderObject = initiatingLoader->classLoaderObject;
J9Class * initiatingLoaderClass = J9OBJECT_CLAZZ(currentThread, initiatingLoaderObject);
J9UTF8 * initiatingLoaderClassNameUTF = J9ROMCLASS_CLASSNAME(initiatingLoaderClass->romClass);
U_16 initiatingLoaderClassNameLength = J9UTF8_LENGTH(initiatingLoaderClassNameUTF);
U_8 * initiatingLoaderClassName = J9UTF8_DATA(initiatingLoaderClassNameUTF);
I_32 initiatingLoaderHash = objectHashCode(currentThread->javaVM, initiatingLoaderObject);
J9ClassLoader * definingLoader = existingClass->classLoader;
j9object_t definingLoaderObject = definingLoader->classLoaderObject;
J9Class * definingLoaderClass = J9OBJECT_CLAZZ(currentThread, definingLoaderObject);
J9UTF8 * definingLoaderClassNameUTF = J9ROMCLASS_CLASSNAME(definingLoaderClass->romClass);
U_16 definingLoaderClassNameLength = J9UTF8_LENGTH(definingLoaderClassNameUTF);
U_8 * definingLoaderClassName = J9UTF8_DATA(definingLoaderClassNameUTF);
I_32 definingLoaderHash = objectHashCode(currentThread->javaVM, definingLoaderObject);
J9UTF8 * existingClassNameUTF = J9ROMCLASS_CLASSNAME(existingClass->romClass);
U_16 existingClassNameLength = J9UTF8_LENGTH(existingClassNameUTF);
U_8 * existingClassName = J9UTF8_DATA(existingClassNameUTF);
UDATA msgLen = j9str_printf(PORTLIB, NULL, 0, nlsMessage,
initiatingLoaderClassNameLength, initiatingLoaderClassName, initiatingLoaderHash,
existingClassNameLength, existingClassName,
definingLoaderClassNameLength, definingLoaderClassName, definingLoaderHash);
msg = j9mem_allocate_memory(msgLen, OMRMEM_CATEGORY_VM);
/* msg NULL check omitted since str_printf accepts NULL (as above) */
j9str_printf(PORTLIB, msg, msgLen, nlsMessage,
initiatingLoaderClassNameLength, initiatingLoaderClassName, initiatingLoaderHash,
existingClassNameLength, existingClassName,
definingLoaderClassNameLength, definingLoaderClassName, definingLoaderHash);
}
setCurrentExceptionUTF(currentThread, J9VMCONSTANTPOOL_JAVALANGLINKAGEERROR, msg);
j9mem_free_memory(msg);
}
void
setClassLoadingConstraintSignatureError(J9VMThread *currentThread, J9ClassLoader *loader1, J9Class *class1, J9ClassLoader *loader2, J9Class *class2, J9Class *exceptionClass, U_8 *methodName, UDATA methodNameLength, U_8 *signature, UDATA signatureLength)
{
PORT_ACCESS_FROM_VMC(currentThread);
char * msg = NULL;
const char * nlsMessage = j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_VM_LOADING_CONSTRAINT_SIG_VIOLATION, NULL);
if (nlsMessage != NULL) {
/* Loader1 name and length */
j9object_t loader1Object = loader1->classLoaderObject;
J9Class * loader1Class = J9OBJECT_CLAZZ(currentThread, loader1Object);
J9UTF8 * loader1ClassNameUTF = J9ROMCLASS_CLASSNAME(loader1Class->romClass);
U_16 loader1ClassNameLength = J9UTF8_LENGTH(loader1ClassNameUTF);
U_8 * loader1ClassName = J9UTF8_DATA(loader1ClassNameUTF);
I_32 loader1Hash = objectHashCode(currentThread->javaVM, loader1Object);
/* Loader2 name and length */
j9object_t loader2Object = loader2->classLoaderObject;
J9Class * loader2Class = J9OBJECT_CLAZZ(currentThread, loader2Object);
J9UTF8 * loader2ClassNameUTF = J9ROMCLASS_CLASSNAME(loader2Class->romClass);
U_16 loader2ClassNameLength = J9UTF8_LENGTH(loader2ClassNameUTF);
U_8 * loader2ClassName = J9UTF8_DATA(loader2ClassNameUTF);
I_32 loader2Hash = objectHashCode(currentThread->javaVM, loader2Object);
/* Class1 name and length */
J9UTF8 * class1NameUTF = J9ROMCLASS_CLASSNAME(class1->romClass);
U_16 class1ClassNameLength = J9UTF8_LENGTH(class1NameUTF);
U_8 * class1ClassName = J9UTF8_DATA(class1NameUTF);
/* Class2 name and length */
J9UTF8 * class2NameUTF = J9ROMCLASS_CLASSNAME(class2->romClass);
U_16 class2ClassNameLength = J9UTF8_LENGTH(class2NameUTF);
U_8 * class2ClassName = J9UTF8_DATA(class2NameUTF);
/* ExceptionClass name and length */
J9UTF8 * exceptionClassNameUTF = J9ROMCLASS_CLASSNAME(exceptionClass->romClass);
U_16 exceptionClassNameLength = J9UTF8_LENGTH(exceptionClassNameUTF);
U_8 * exceptionClassName = J9UTF8_DATA(exceptionClassNameUTF);
UDATA msgLen = j9str_printf(PORTLIB, NULL, 0, nlsMessage,
exceptionClassNameLength, exceptionClassName,
methodNameLength, methodName,
signatureLength, signature,
loader1ClassNameLength, loader1ClassName, loader1Hash,
class1ClassNameLength, class1ClassName,
loader2ClassNameLength, loader2ClassName, loader2Hash,
class2ClassNameLength, class2ClassName
);
msg = j9mem_allocate_memory(msgLen, OMRMEM_CATEGORY_VM);
/* msg NULL check omitted since str_printf accepts NULL (as above) */
j9str_printf(PORTLIB, msg, msgLen, nlsMessage,
exceptionClassNameLength, exceptionClassName,
methodNameLength, methodName,
signatureLength, signature,
loader1ClassNameLength, loader1ClassName, loader1Hash,
class1ClassNameLength, class1ClassName,
loader2ClassNameLength, loader2ClassName, loader2Hash,
class2ClassNameLength, class2ClassName
);
}
setCurrentExceptionUTF(currentThread, J9VMCONSTANTPOOL_JAVALANGLINKAGEERROR, msg);
j9mem_free_memory(msg);
}
void
setClassLoadingConstraintOverrideError(J9VMThread *currentThread, J9UTF8 *newClassNameUTF, J9ClassLoader *loader1, J9UTF8 *class1NameUTF, J9ClassLoader *loader2, J9UTF8 *class2NameUTF, J9UTF8 *exceptionClassNameUTF, U_8 *methodName, UDATA methodNameLength, U_8 *signature, UDATA signatureLength)
{
PORT_ACCESS_FROM_VMC(currentThread);
char * msg = NULL;
const char * nlsMessage = j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_VM_LOADING_CONSTRAINT_OVERRIDE_VIOLATION, NULL);
if (nlsMessage != NULL) {
/* Loader1 name and length */
j9object_t loader1Object = loader1->classLoaderObject;
J9Class * loader1Class = J9OBJECT_CLAZZ(currentThread, loader1Object);
J9UTF8 * loader1ClassNameUTF = J9ROMCLASS_CLASSNAME(loader1Class->romClass);
U_16 loader1ClassNameLength = J9UTF8_LENGTH(loader1ClassNameUTF);
U_8 * loader1ClassName = J9UTF8_DATA(loader1ClassNameUTF);
I_32 loader1Hash = objectHashCode(currentThread->javaVM, loader1Object);
/* Loader2 name and length */
j9object_t loader2Object = loader2->classLoaderObject;
J9Class * loader2Class = J9OBJECT_CLAZZ(currentThread, loader2Object);
J9UTF8 * loader2ClassNameUTF = J9ROMCLASS_CLASSNAME(loader2Class->romClass);
U_16 loader2ClassNameLength = J9UTF8_LENGTH(loader2ClassNameUTF);
U_8 * loader2ClassName = J9UTF8_DATA(loader2ClassNameUTF);
I_32 loader2Hash = objectHashCode(currentThread->javaVM, loader2Object);
/* Class1 name and length */
U_16 class1ClassNameLength = J9UTF8_LENGTH(class1NameUTF);
U_8 * class1ClassName = J9UTF8_DATA(class1NameUTF);