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bcverify.c
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/*******************************************************************************
* Copyright (c) 1991, 2018 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 "bcvcfr.h"
#include "bcverify.h"
#include "j9bcvnls.h"
#include "cfreader.h"
#include "bcnames.h"
#include "pcstack.h"
#include "j9cp.h"
#include "j9protos.h"
#include "j9consts.h"
#include "omrthread.h"
#include "jvminit.h"
#include "vrfyconvert.h"
#include "bcverify_internal.h"
#include "vrfytbl.h"
#include "vmhook_internal.h"
#include "SCQueryFunctions.h"
#define _UTE_STATIC_
#include "ut_j9bcverify.h"
#include "bcverify.h"
/* Define for debug
#define DEBUG_BCV
*/
#define BYTECODE_MAP_DEFAULT_SIZE (2 * 1024)
#define STACK_MAPS_DEFAULT_SIZE (2 * 1024)
#define LIVE_STACK_DEFAULT_SIZE 256
#define ROOT_QUEUE_DEFAULT_SIZE 256
#define CLASSNAMELIST_DEFAULT_SIZE (128 * sizeof(UDATA *)) /* 128 pointers */
#define CLASSNAMESEGMENT_DEFAULT_SIZE 1024 /* 1k bytes - minimum of 8 bytes per classNameList entry */
#define BCV_INTERNAL_DEFAULT_SIZE (32*1024)
#define THIS_DLL_NAME J9_VERIFY_DLL_NAME
#define OPT_XVERIFY "-Xverify"
#define OPT_XVERIFY_COLON "-Xverify:"
#define OPT_ALL "all"
#define OPT_OPT "opt"
#define OPT_NO_OPT "noopt"
#define OPT_NO_FALLBACK "nofallback"
#define OPT_IGNORE_STACK_MAPS "ignorestackmaps"
#define OPT_EXCLUDEATTRIBUTE_EQUAL "excludeattribute="
#define OPT_BOOTCLASSPATH_STATIC "bootclasspathstatic"
#define OPT_DO_PROTECTED_ACCESS_CHECK "doProtectedAccessCheck"
static IDATA buildBranchMap (J9BytecodeVerificationData * verifyData);
static IDATA decompressStackMaps (J9BytecodeVerificationData * verifyData, IDATA localsCount, U_8 * stackMapData);
static VMINLINE IDATA parseLocals (J9BytecodeVerificationData * verifyData, U_8** stackMapData, J9BranchTargetStack * liveStack, IDATA localDelta, IDATA localsCount, IDATA maxLocals);
static VMINLINE IDATA parseStack (J9BytecodeVerificationData * verifyData, U_8** stackMapData, J9BranchTargetStack * liveStack, UDATA stackCount, UDATA maxStack);
static UDATA parseElement (J9BytecodeVerificationData * verifyData, U_8 ** stackMapData);
static VMINLINE void copyStack (J9BranchTargetStack *source, J9BranchTargetStack *destination);
static IDATA mergeObjectTypes (J9BytecodeVerificationData *verifyData, UDATA sourceType, UDATA * targetTypePointer);
static IDATA mergeStacks (J9BytecodeVerificationData * verifyData, UDATA target);
static J9UTF8 * mergeClasses(J9BytecodeVerificationData *verifyData, U_8* firstClass, UDATA firstLength, U_8* secondClass, UDATA secondLength, IDATA *reasonCode);
static void bcvHookClassesUnload (J9HookInterface** hook, UDATA eventNum, void* eventData, void* userData);
static void printMethod (J9BytecodeVerificationData * verifyData);
static IDATA simulateStack (J9BytecodeVerificationData * verifyData);
static IDATA parseOptions (J9JavaVM *vm, char *optionValues, char **errorString);
static IDATA setVerifyState ( J9JavaVM *vm, char *option, char **errorString );
/**
* Walk the J9-format stack maps and set the uninitialized_this flag appropriately
* for each map. It is set to TRUE for the map, if the map's stack contains an
* uninitialized_this object.
* NOTE: This is only necessary for <init> methods.
*/
static void
setInitializedThisStatus(J9BytecodeVerificationData *verifyData)
{
J9BranchTargetStack * currentStack = NULL;
IDATA nextMapIndex = 0;
while (nextMapIndex < verifyData->stackMapsCount) {
currentStack = BCV_INDEX_STACK (nextMapIndex);
nextMapIndex++;
/* Ensure we're not a stack map for dead code */
if (currentStack->stackBaseIndex != -1) {
BOOLEAN flag_uninitialized = FALSE;
IDATA i = 0;
for (; i < currentStack->stackTopIndex; i++) {
if ((currentStack->stackElements[i] & BCV_SPECIAL_INIT) == BCV_SPECIAL_INIT) {
flag_uninitialized = TRUE;
break;
}
}
currentStack->uninitializedThis = flag_uninitialized;
}
}
}
/*
API
@verifyData - internal data structure
@firstClass - U_8 pointer to class name
@firstLength - UDATA length of class name
@secondClass - U_8 pointer to class name
@secondLength - UDATA length of class name
Answer the first common class shared by the two classes.
If one of the classes is a parent of the other, answer that class.
Return NULL on error.
sets reasonCode to BCV_FAIL on verification error
sets reasonCode to BCV_ERR_INSUFFICIENT_MEMORY on OOM
sets reasonCode to BCV_ERR_INTERNAL_ERROR otherwise
*/
#define SUPERCLASS(clazz) ((clazz)->superclasses[ J9CLASS_DEPTH(clazz) - 1 ])
static J9UTF8 *
mergeClasses(J9BytecodeVerificationData *verifyData, U_8* firstClass, UDATA firstLength, U_8* secondClass, UDATA secondLength, IDATA *reasonCode)
{
J9Class *sourceRAM, *targetRAM;
UDATA sourceDepth, targetDepth;
/* Go get the ROM class for the source and target. Check if it returns null immediately to prevent
* having to load the second class in an error case */
sourceRAM = j9rtv_verifierGetRAMClass( verifyData, verifyData->classLoader, firstClass, firstLength, reasonCode);
if (NULL == sourceRAM) {
return NULL;
}
targetRAM = j9rtv_verifierGetRAMClass( verifyData, verifyData->classLoader, secondClass, secondLength, reasonCode );
if (NULL == targetRAM) {
return NULL;
}
sourceRAM = J9_CURRENT_CLASS(sourceRAM);
sourceDepth = J9CLASS_DEPTH(sourceRAM);
targetDepth = J9CLASS_DEPTH(targetRAM);
/* walk up the chain until sourceROM == targetROM */
while( sourceRAM != targetRAM ) {
if( sourceDepth >= targetDepth ) {
sourceRAM = SUPERCLASS(sourceRAM);
if ( sourceRAM ) {
sourceDepth = J9CLASS_DEPTH(sourceRAM);
}
}
if (sourceRAM == targetRAM )
break;
if( sourceDepth <= targetDepth ) {
targetRAM = SUPERCLASS(targetRAM);
if ( targetRAM ) {
targetDepth = J9CLASS_DEPTH(targetRAM);
}
}
if( (sourceRAM == NULL) || (targetRAM == NULL) ) {
*reasonCode = BCV_FAIL;
return NULL;
}
}
/* good, both sourceROM and targetROM are the same class -- this is the new target class */
return( J9ROMCLASS_CLASSNAME( targetRAM->romClass ) );
}
#undef SUPERCLASS
/*
Determine the number of branch targets in this method.
Returns
count of unique branch targets and exception handler starts.
BCV_ERR_INTERNAL_ERROR for any unexpected error
*/
static IDATA
buildBranchMap (J9BytecodeVerificationData * verifyData)
{
J9ROMMethod *romMethod = verifyData->romMethod;
U_32 *bytecodeMap = verifyData->bytecodeMap;
U_8 *bcStart;
U_8 *bcIndex;
U_8 *bcEnd;
UDATA npairs, temp;
IDATA pc, start, high, low, pcs;
I_16 shortBranch;
I_32 longBranch;
UDATA bc, size;
UDATA count = 0;
bcStart = J9_BYTECODE_START_FROM_ROM_METHOD(romMethod);
bcIndex = bcStart;
bcEnd = bcStart + J9_BYTECODE_SIZE_FROM_ROM_METHOD(romMethod);
while (bcIndex < bcEnd) {
bc = *bcIndex;
size = J9JavaInstructionSizeAndBranchActionTable[bc];
if (size == 0) {
verifyData->errorPC = bcIndex - bcStart;
Trc_BCV_buildBranchMap_UnknownInstruction(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, romMethod)),
bc, verifyData->errorPC, verifyData->errorPC);
return BCV_ERR_INTERNAL_ERROR;
}
switch (size >> 4) {
case 5: /* switches */
start = bcIndex - bcStart;
pc = (start + 4) & ~3;
bcIndex = bcStart + pc;
longBranch = (I_32) PARAM_32(bcIndex, 0);
bcIndex += 4;
if (bytecodeMap[start + longBranch] == 0) {
bytecodeMap[start + longBranch] = BRANCH_TARGET;
count++;
}
low = (I_32) PARAM_32(bcIndex, 0);
bcIndex += 4;
low = (I_32) low;
if (bc == JBtableswitch) {
high = (I_32) PARAM_32(bcIndex, 0);
bcIndex += 4;
high = (I_32) high;
npairs = (UDATA) (high - low + 1);
pcs = 0;
} else {
npairs = (UDATA) low;
pcs = 4;
}
for (temp = 0; temp < npairs; temp++) {
bcIndex += pcs;
longBranch = (I_32) PARAM_32(bcIndex, 0);
bcIndex += 4;
if (bytecodeMap[start + longBranch] == 0) {
bytecodeMap[start + longBranch] = BRANCH_TARGET;
count++;
}
}
continue;
case 2: /* gotos */
if (bc == JBgotow) {
start = bcIndex - bcStart;
longBranch = (I_32) PARAM_32(bcIndex, 1);
if (bytecodeMap[start + longBranch] == 0) {
bytecodeMap[start + longBranch] = BRANCH_TARGET;
count++;
}
break;
} /* fall through for JBgoto */
case 1: /* ifs */
shortBranch = (I_16) PARAM_16(bcIndex, 1);
start = bcIndex - bcStart;
if (bytecodeMap[start + shortBranch] == 0) {
bytecodeMap[start + shortBranch] = BRANCH_TARGET;
count++;
}
break;
}
bcIndex += size & 7;
}
/* need to walk exceptions as well, since they are branch targets */
if (romMethod->modifiers & J9AccMethodHasExceptionInfo) {
J9ExceptionInfo * exceptionData = J9_EXCEPTION_DATA_FROM_ROM_METHOD(romMethod);
J9ExceptionHandler *handler;
if (exceptionData->catchCount) {
handler = J9EXCEPTIONINFO_HANDLERS(exceptionData);
for (temp=0; temp < (U_32) exceptionData->catchCount; temp++) {
pc = (IDATA) handler->startPC;
pcs = (IDATA) handler->handlerPC;
/* Avoid re-walking a handler that handles itself */
if (pc != pcs) {
bytecodeMap[pc] |= BRANCH_EXCEPTION_START;
}
if ((bytecodeMap[pcs] & BRANCH_TARGET) == 0) {
bytecodeMap[pcs] |= BRANCH_TARGET;
count++;
}
handler++;
}
}
}
Trc_BCV_buildBranchMap_branchCount(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, romMethod)),
count);
return count;
}
/*
Convert the StackMap Attribute maps to internal uncompressed stackmaps.
Returns
BCV_SUCCESS on success,
BCV_FAIL on verification error
*/
static IDATA
decompressStackMaps (J9BytecodeVerificationData * verifyData, IDATA localsCount, U_8 * stackMapData)
{
J9ROMMethod *romMethod = verifyData->romMethod;
UDATA maxStack = J9_MAX_STACK_FROM_ROM_METHOD(romMethod);
IDATA maxLocals = J9_ARG_COUNT_FROM_ROM_METHOD(romMethod) + J9_TEMP_COUNT_FROM_ROM_METHOD(romMethod);
UDATA length = (UDATA) J9_BYTECODE_SIZE_FROM_ROM_METHOD(romMethod);
UDATA i;
IDATA rc = BCV_SUCCESS;
J9BranchTargetStack *liveStack = (J9BranchTargetStack *)verifyData->liveStack;
J9BranchTargetStack *branchTargetStack = BCV_FIRST_STACK();
U_8 mapType;
UDATA mapPC = -1;
UDATA temp;
UDATA start = 0; /* Used in BUILD_VERIFY_ERROR */
UDATA mapIndex = 0;
UDATA errorModule = J9NLS_BCV_ERR_NO_ERROR__MODULE; /* default to BCV NLS catalog */
Trc_BCV_decompressStackMaps_Entry(verifyData->vmStruct, localsCount);
/* localsCount records the current locals depth as all stack maps (except full frame) are relative to the previous frame */
for (i = 0; i < (UDATA) verifyData->stackMapsCount; i++) {
IDATA localDelta = 0;
UDATA stackCount = 0;
NEXT_U8(mapType, stackMapData);
mapPC++;
if (mapType < CFR_STACKMAP_SAME_LOCALS_1_STACK) {
/* Same frame 0-63 */
mapPC += (UDATA) mapType;
/* done */
} else if (mapType < CFR_STACKMAP_SAME_LOCALS_1_STACK_END) {
/* Same with one stack entry frame 64-127 */
mapPC += (UDATA) ((UDATA) mapType - CFR_STACKMAP_SAME_LOCALS_1_STACK);
stackCount = 1;
} else {
mapPC += NEXT_U16(temp, stackMapData);
if (mapType == CFR_STACKMAP_SAME_LOCALS_1_STACK_EXTENDED) {
/* Same with one stack entry extended address frame 247 */
stackCount = 1;
} else if (mapType < CFR_STACKMAP_FULL) {
/* Chop 3-1 locals frame 248-250 */
/* Same with extended address frame 251 */
/* Append 1-3 locals frame 252-254 */
localDelta = ((IDATA) mapType) - CFR_STACKMAP_SAME_EXTENDED;
} else if (mapType == CFR_STACKMAP_FULL) {
/* Full frame 255 */
localDelta = NEXT_U16(temp, stackMapData);
localsCount = 0;
}
}
localsCount = parseLocals (verifyData, &stackMapData, liveStack, localDelta, localsCount, maxLocals);
if (localsCount < 0) {
BUILD_VERIFY_ERROR (errorModule, J9NLS_BCV_ERR_INCONSISTENT_STACK__ID);
/* Jazz 82615: Set the pc value of the current stackmap frame to show up in the error message frame work */
liveStack->pc = mapPC;
verifyData->errorPC = mapPC;
Trc_BCV_decompressStackMaps_LocalsArrayOverFlowUnderFlow(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, romMethod)),
i, mapPC);
rc = BCV_FAIL;
break;
}
if (mapType == CFR_STACKMAP_FULL) {
stackCount = NEXT_U16(temp, stackMapData);
}
if (BCV_SUCCESS != parseStack (verifyData, &stackMapData, liveStack, stackCount, maxStack)) {
BUILD_VERIFY_ERROR (errorModule, J9NLS_BCV_ERR_INCONSISTENT_STACK__ID);
/* Jazz 82615: Set the pc value of the current stackmap frame to show up in the error message frame work */
liveStack->pc = mapPC;
verifyData->errorPC = mapPC;
Trc_BCV_decompressStackMaps_StackArrayOverFlow(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, romMethod)),
i, mapPC);
rc = BCV_FAIL;
break;
}
if (mapPC >= length) {
/* should never get here - caught in staticverify.c checkStackMap */
BUILD_VERIFY_ERROR (errorModule, J9NLS_BCV_ERR_INCONSISTENT_STACK__ID);
Trc_BCV_decompressStackMaps_MapOutOfRange(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, romMethod)),
i, mapPC, length);
rc = BCV_FAIL;
break;
}
(verifyData->bytecodeMap)[mapPC] |= (mapIndex << BRANCH_INDEX_SHIFT) | BRANCH_TARGET;
mapIndex++;
copyStack (liveStack, branchTargetStack);
branchTargetStack->pc = mapPC;
/* Point to the next stack */
branchTargetStack = BCV_NEXT_STACK (branchTargetStack);
}
Trc_BCV_decompressStackMaps_Exit(verifyData->vmStruct, rc);
return rc;
}
/* Specifically returns BCV_ERR_INTERNAL_ERROR for failure */
static IDATA
parseLocals (J9BytecodeVerificationData * verifyData, U_8** stackMapData, J9BranchTargetStack * liveStack, IDATA localDelta, IDATA localsCount, IDATA maxLocals)
{
UDATA i;
UDATA stackEntry;
UDATA unusedLocals;
if (localDelta < 0) {
/* Clear the chopped elements */
for (;localDelta; localDelta++) {
localsCount--;
if (localsCount < 0) {
goto _underflow;
}
liveStack->stackElements[localsCount] = BCV_BASE_TYPE_TOP;
/* Check long/double type as long as there still remains local variables
* in the stackmap frame.
*/
if (localsCount > 0) {
/* Possibly remove a double or long (counts as 1 local, but two slots).
* A double or a long is pushed as <top, double|long>
*/
stackEntry = liveStack->stackElements[localsCount - 1];
if ((BCV_BASE_TYPE_DOUBLE == stackEntry) || (BCV_BASE_TYPE_LONG == stackEntry)) {
localsCount--;
if (localsCount < 0) {
goto _underflow;
}
liveStack->stackElements[localsCount] = BCV_BASE_TYPE_TOP;
}
}
}
} else {
for (;localDelta; localDelta--) {
stackEntry = parseElement (verifyData, stackMapData);
if (localsCount >= maxLocals) {
/* Oveflow */
goto _overflow;
}
liveStack->stackElements[localsCount++] = stackEntry;
if ((BCV_BASE_TYPE_DOUBLE == stackEntry) || (BCV_BASE_TYPE_LONG == stackEntry)) {
if (localsCount >= maxLocals) {
/* Oveflow */
goto _overflow;
}
liveStack->stackElements[localsCount++] = BCV_BASE_TYPE_TOP;
}
}
/* Clear the remaining locals */
unusedLocals = liveStack->stackBaseIndex - localsCount;
for (i = localsCount; i < (unusedLocals + localsCount); i++) {
liveStack->stackElements[i] = BCV_BASE_TYPE_TOP;
}
}
return localsCount;
_underflow:
/* Jazz 82615: Set the error code in the case of underflow on 'locals' in the current stackmap frame */
verifyData->errorDetailCode = BCV_ERR_STACKMAP_FRAME_LOCALS_UNDERFLOW;
Trc_BCV_parseLocals_LocalsArrayUnderFlow(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)));
return BCV_ERR_INTERNAL_ERROR;
_overflow:
/* Jazz 82615: Set the error code, the location of the last local variable allowed on 'locals'
* and the maximum local size in the case of overflow on 'locals' in the currrent stackmap frame.
*/
verifyData->errorDetailCode = BCV_ERR_STACKMAP_FRAME_LOCALS_OVERFLOW;
verifyData->errorCurrentFramePosition = (maxLocals > 0) ? (U_32)(maxLocals - 1) : 0;
verifyData->errorTempData = (UDATA)maxLocals;
Trc_BCV_parseLocals_LocalsArrayOverFlow(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)));
return BCV_ERR_INTERNAL_ERROR;
}
/*
* returns BCV_SUCCESS on success
* returns BCV_ERR_INTERNAL_ERROR on failure
*/
static IDATA
parseStack (J9BytecodeVerificationData * verifyData, U_8** stackMapData, J9BranchTargetStack * liveStack, UDATA stackCount, UDATA maxStack)
{
UDATA stackEntry;
UDATA* stackTop = RELOAD_STACKBASE(liveStack); /* Clears the stack */
UDATA* stackBase = stackTop;
for (;stackCount; stackCount--) {
stackEntry = parseElement (verifyData, stackMapData);
if ((UDATA) (stackTop - stackBase) >= maxStack) {
/* Jazz 82615: Set the error code and the location of wrong data type on 'stack' (only keep the maximum size for stack) */
verifyData->errorDetailCode = BCV_ERR_STACKMAP_FRAME_STACK_OVERFLOW;
verifyData->errorCurrentFramePosition = (U_32)(stackBase - liveStack->stackElements);
if (maxStack > 0) {
verifyData->errorCurrentFramePosition += (U_32)(maxStack - 1);
}
verifyData->errorTempData = maxStack;
return BCV_ERR_INTERNAL_ERROR;
}
PUSH(stackEntry);
if ((stackEntry == BCV_BASE_TYPE_DOUBLE) || (stackEntry == BCV_BASE_TYPE_LONG)) {
if ((UDATA) (stackTop - stackBase) >= maxStack) {
/* Jazz 82615: Set the error code and the location of wrong data type on 'stack' (only keep the maximum size for stack) */
verifyData->errorDetailCode = BCV_ERR_STACKMAP_FRAME_STACK_OVERFLOW;
verifyData->errorCurrentFramePosition = (U_32)(stackBase - liveStack->stackElements);
if (maxStack > 0) {
verifyData->errorCurrentFramePosition += (U_32)(maxStack - 1);
}
verifyData->errorTempData = maxStack;
return BCV_ERR_INTERNAL_ERROR;
}
PUSH(BCV_BASE_TYPE_TOP);
}
}
SAVE_STACKTOP(liveStack, stackTop);
return BCV_SUCCESS;
}
/*
* returns stackEntry
* No error path in this function
*/
static UDATA
parseElement (J9BytecodeVerificationData * verifyData, U_8** stackMapData)
{
J9ROMClass * romClass = verifyData->romClass;
U_8 entryType;
U_8 *mapData = *stackMapData;
U_16 cpIndex;
UDATA stackEntry;
NEXT_U8(entryType, mapData);
if (entryType < CFR_STACKMAP_TYPE_INIT_OBJECT) {
/* return primitive type */
stackEntry = verificationTokenDecode[entryType];
} else if (entryType == CFR_STACKMAP_TYPE_INIT_OBJECT) {
J9ROMMethod *romMethod = verifyData->romMethod;
J9UTF8* className = J9ROMCLASS_CLASSNAME(romClass);
stackEntry = convertClassNameToStackMapType(verifyData, J9UTF8_DATA(className), J9UTF8_LENGTH(className), BCV_SPECIAL_INIT, 0);
} else if (entryType == CFR_STACKMAP_TYPE_OBJECT) {
J9UTF8 *utf8string;
J9ROMConstantPoolItem *constantPool = J9_ROM_CP_FROM_ROM_CLASS(romClass);
NEXT_U16(cpIndex, mapData);
utf8string = J9ROMSTRINGREF_UTF8DATA((J9ROMStringRef *) (&constantPool[cpIndex]));
pushClassType(verifyData, utf8string, &stackEntry);
} else if (entryType == CFR_STACKMAP_TYPE_NEW_OBJECT) {
NEXT_U16(cpIndex, mapData);
stackEntry = BCV_SPECIAL_NEW | (((UDATA) cpIndex) << BCV_CLASS_INDEX_SHIFT);
} else {
/* Primitive arrays */
U_16 arity;
stackEntry = (UDATA) verificationTokenDecode[entryType];
NEXT_U16(arity, mapData);
stackEntry |= (((UDATA) arity) << BCV_ARITY_SHIFT);
}
*stackMapData = mapData;
return stackEntry;
}
static void
copyStack (J9BranchTargetStack *source, J9BranchTargetStack *destination)
{
UDATA pc = destination->pc;
memcpy((UDATA *) destination, (UDATA *) source, (source->stackTopIndex + BCV_TARGET_STACK_HEADER_UDATA_SIZE) * sizeof(UDATA));
destination->pc = pc;
}
/* returns
* BCV_SUCCESS : no merge necessary
* BCV_FAIL : cause a rewalk
* BCV_ERR_INSUFFICIENT_MEMORY : OOM - no rewalk
*/
static IDATA
mergeObjectTypes (J9BytecodeVerificationData *verifyData, UDATA sourceType, UDATA * targetTypePointer)
{
J9ROMClass * romClass = verifyData->romClass;
UDATA targetType = *targetTypePointer;
UDATA sourceIndex, targetIndex;
J9UTF8 *name;
UDATA classArity, targetArity, classIndex;
IDATA rc = BCV_SUCCESS;
U_8 *sourceName, *targetName;
UDATA sourceLength, targetLength;
U_32 *offset;
IDATA reasonCode = 0;
/* assume that sourceType and targetType are not equal */
/* if target is more general than source, then its fine */
rc = isClassCompatible( verifyData, sourceType, targetType, &reasonCode ) ;
if (TRUE == rc) {
return BCV_SUCCESS; /* no merge required */
} else { /* FALSE == rc */
/* VM error, no need to continue, return appropriate rc */
if (BCV_ERR_INTERNAL_ERROR == reasonCode) {
*targetTypePointer = (U_32)BCV_JAVA_LANG_OBJECT_INDEX << BCV_CLASS_INDEX_SHIFT;
Trc_BCV_mergeObjectTypes_UnableToLoadClass(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
sourceType, targetType);
return (IDATA) BCV_FAIL;
} else if (BCV_ERR_INSUFFICIENT_MEMORY == reasonCode) {
Trc_BCV_mergeObjectTypes_MergeClasses_OutOfMemoryException(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)));
return BCV_ERR_INSUFFICIENT_MEMORY;
}
}
/* Types were not compatible, thus target is not equal or more general than source */
/* NULL always loses to objects */
if (targetType == BCV_BASE_TYPE_NULL) {
Trc_BCV_mergeObjectTypes_NullTargetOverwritten(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
sourceType);
*targetTypePointer = sourceType;
/* cause a re-walk */
return (IDATA) BCV_FAIL;
}
/* if the source or target are base type arrays, decay them to object arrays of arity n-1 (or just Object) */
/* Base arrays already have an implicit arity of 1, so just keep the arity for object */
if (sourceType & BCV_TAG_BASE_ARRAY_OR_NULL) {
Trc_BCV_mergeObjectTypes_DecaySourceArray(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
sourceType);
sourceType = (sourceType & BCV_ARITY_MASK) | ((U_32)BCV_JAVA_LANG_OBJECT_INDEX << BCV_CLASS_INDEX_SHIFT);
}
if (targetType & BCV_TAG_BASE_ARRAY_OR_NULL) {
Trc_BCV_mergeObjectTypes_DecayTargetArray(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
targetType);
targetType = (targetType & BCV_ARITY_MASK) | ((U_32)BCV_JAVA_LANG_OBJECT_INDEX << BCV_CLASS_INDEX_SHIFT);
}
classArity = sourceType & BCV_ARITY_MASK;
targetArity = targetType & BCV_ARITY_MASK;
if (classArity == targetArity) {
/* Find the common parent class if the same arity */
sourceIndex = (sourceType & BCV_CLASS_INDEX_MASK) >> BCV_CLASS_INDEX_SHIFT;
targetIndex = (targetType & BCV_CLASS_INDEX_MASK) >> BCV_CLASS_INDEX_SHIFT;
offset = (U_32 *) verifyData->classNameList[sourceIndex];
sourceLength = (UDATA) J9UTF8_LENGTH(offset + 1);
if (offset[0] == 0) {
sourceName = J9UTF8_DATA(offset + 1);
} else {
sourceName = (U_8 *) ((UDATA) offset[0] + (UDATA) romClass);
}
offset = (U_32 *) verifyData->classNameList[targetIndex];
targetLength = (UDATA) J9UTF8_LENGTH(offset + 1);
if (offset[0] == 0) {
targetName = J9UTF8_DATA(offset + 1);
} else {
targetName = (U_8 *) ((UDATA) offset[0] + (UDATA) romClass);
}
name = mergeClasses(verifyData, sourceName, sourceLength, targetName, targetLength, &reasonCode);
if (NULL == name) {
if (BCV_ERR_INSUFFICIENT_MEMORY == reasonCode) {
Trc_BCV_mergeObjectTypes_MergeClasses_OutOfMemoryException(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)));
return BCV_ERR_INSUFFICIENT_MEMORY;
} else {
Trc_BCV_mergeObjectTypes_MergeClassesFail(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
sourceLength, sourceName, targetLength, targetName);
*targetTypePointer = sourceType;
/* cause a re-walk */
return (IDATA) BCV_FAIL;
}
}
classIndex = findClassName( verifyData, J9UTF8_DATA(name), J9UTF8_LENGTH(name) );
Trc_BCV_mergeObjectTypes_MergeClassesSucceed(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
sourceLength, sourceName, targetLength, targetName, J9UTF8_LENGTH(name), J9UTF8_DATA(name), classIndex);
} else {
/* Different arity means common parent class is the minimum arity of class Object */
classIndex = BCV_JAVA_LANG_OBJECT_INDEX;
Trc_BCV_mergeObjectTypes_MergeClassesMinimumArity(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
classArity, targetArity);
/* Find minimum common arity of arrays */
if( targetArity < classArity ) {
classArity = targetArity;
}
}
/* slam new type into targetTypePointer */
*targetTypePointer = classArity | ( classIndex << BCV_CLASS_INDEX_SHIFT );
Trc_BCV_mergeObjectTypes_MergedClass(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
*targetTypePointer);
/* cause a re-walk */
return (IDATA) BCV_FAIL;
}
/*
* returns BCV_SUCCESS on success
* returns BCV_FAIL on failure
* returns BCV_ERR_INSUFFICIENT_MEMORY on OOM */
static IDATA
mergeStacks (J9BytecodeVerificationData * verifyData, UDATA target)
{
J9ROMClass *romClass = verifyData->romClass;
J9ROMMethod *romMethod = verifyData->romMethod;
UDATA maxIndex = J9_ARG_COUNT_FROM_ROM_METHOD(romMethod) + J9_TEMP_COUNT_FROM_ROM_METHOD(romMethod);
U_32 *bytecodeMap = verifyData->bytecodeMap;
UDATA i = 0;
UDATA stackIndex;
IDATA rewalk = FALSE;
IDATA rc = BCV_SUCCESS;
UDATA *targetStackPtr, *targetStackTop, *sourceStackPtr, *sourceStackTop, *sourceStackTemps;
J9BranchTargetStack *liveStack = (J9BranchTargetStack *) verifyData->liveStack;
J9BranchTargetStack *targetStack;
stackIndex = bytecodeMap[target] >> BRANCH_INDEX_SHIFT;
targetStack = BCV_INDEX_STACK (stackIndex);
Trc_BCV_mergeStacks_Entry(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
target, target);
if (targetStack->stackBaseIndex == -1) {
/* Target location does not have a stack, so give the target our current stack */
copyStack(liveStack, targetStack);
verifyData->unwalkedQueue[verifyData->unwalkedQueueTail++] = target;
verifyData->unwalkedQueueTail %= (verifyData->rootQueueSize / sizeof(UDATA));
bytecodeMap[target] |= BRANCH_ON_UNWALKED_QUEUE;
Trc_BCV_mergeStacks_CopyStack(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
stackIndex, target, target);
goto _finished;
} else {
UDATA mergePC = (UDATA) -1;
U_32 resultArrayBase;
/* Check stack size equality */
if (targetStack->stackTopIndex != liveStack->stackTopIndex) {
rc = BCV_FAIL;
Trc_BCV_mergeStacks_DepthMismatch(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
stackIndex, target, target,
liveStack->stackTopIndex, targetStack->stackTopIndex);
goto _finished;
}
/* Now we have to merge stacks */
targetStackPtr = targetStack->stackElements;
targetStackTop = RELOAD_STACKTOP(targetStack);
sourceStackPtr = liveStack->stackElements;
sourceStackTop = RELOAD_STACKTOP(liveStack);
/* remember where the temps end */
sourceStackTemps = RELOAD_STACKBASE(liveStack);
Trc_BCV_mergeStacks_MergeStacks(verifyData->vmStruct,
(UDATA) J9UTF8_LENGTH(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
J9UTF8_DATA(J9ROMCLASS_CLASSNAME(verifyData->romClass)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_NAME(verifyData->romClass, verifyData->romMethod)),
(UDATA) J9UTF8_LENGTH(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
J9UTF8_DATA(J9ROMMETHOD_GET_SIGNATURE(verifyData->romClass, verifyData->romMethod)),
stackIndex, target, target);
while (sourceStackPtr != sourceStackTop) {
/* Merge if the source and target slots are not identical */
if (*sourceStackPtr != *targetStackPtr) {
UDATA sourceItem = *sourceStackPtr;
UDATA targetItem = *targetStackPtr;
/* Merge in the locals */
if (sourceStackPtr < sourceStackTemps ) {
/* Merge when either the source or target not an object */
if ((sourceItem | targetItem) & (BCV_BASE_OR_SPECIAL)) {
/* Mismatch results in undefined local - rewalk if modified stack */
if (*targetStackPtr != (UDATA) (BCV_BASE_TYPE_TOP)) {
*targetStackPtr = (UDATA) (BCV_BASE_TYPE_TOP);
rewalk = TRUE;
}
/* Merge two objects */
} else {
/* extra checks here to avoid calling local mapper unnecessarily */
/* Null source or java/lang/Object targets always work trivially */
if ((*sourceStackPtr != BCV_BASE_TYPE_NULL) && (*targetStackPtr != (BCV_JAVA_LANG_OBJECT_INDEX << BCV_CLASS_INDEX_SHIFT))) {
/* Null target always causes a re-walk - source is never null here */
if (*targetStackPtr == BCV_BASE_TYPE_NULL) {
*targetStackPtr = *sourceStackPtr;
rewalk = TRUE;
} else {
/* Use local mapper to check merge necessity in locals */
if ((verifyData->verificationFlags & J9_VERIFY_OPTIMIZE) && (maxIndex <= 32)) {
/* Only handle 32 locals or less */
UDATA index = (UDATA) (sourceStackPtr - liveStack->stackElements);
/* Reuse map in this merge if needed for multiple merges at same map */
if (mergePC == ((UDATA) -1)) {
mergePC = target;
if (j9localmap_LocalBitsForPC(verifyData->portLib, romClass, romMethod, mergePC, &resultArrayBase, NULL, NULL, NULL) != 0) {
/* local map error - force a full merge */
resultArrayBase = (U_32) -1;
}
}
if (resultArrayBase & (1 << index)) {
UDATA origSource = *sourceStackPtr;
UDATA origTarget = *targetStackPtr;
IDATA tempRC = mergeObjectTypes(verifyData, *sourceStackPtr, targetStackPtr);
/* Merge the objects - the result is live */
if (BCV_FAIL == tempRC) {
rewalk = TRUE;
} else if (BCV_ERR_INSUFFICIENT_MEMORY == tempRC) {
rc = BCV_ERR_INSUFFICIENT_MEMORY;
goto _finished;