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jswalk.c
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/*******************************************************************************
* Copyright (c) 1991, 2021 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 "j9.h"
#ifdef J9VM_INTERP_STACKWALK_TRACING
#define walkFrame walkFrameVerbose
#define jitGetOwnedObjectMonitors jitGetOwnedObjectMonitorsVerbose
#define walkBytecodeFrameSlots walkBytecodeFrameSlotsVerbose
#endif
#include "j9protos.h"
#include "MethodMetaData.h"
#include "jitprotos.h"
#include "stackwalk.h"
#include "rommeth.h"
#include "j9cp.h"
#include "jitregmap.h"
#include "j9codertnls.h"
#include "HeapIteratorAPI.h"
#ifdef J9VM_INTERP_LINEAR_STACKWALK_TRACING
#include "../vm/linearswalk.h"
#include "ut_j9vrb.h"
#else
#include "ut_j9codertvm.h"
#endif
#define J9JIT_ARTIFACT_SEARCH_CACHE_ENABLE
#ifndef J9VM_INTERP_STACKWALK_TRACING
#define walkFrame (walkState->walkThread->javaVM->walkFrame)
#define walkBytecodeFrameSlots (walkState->walkThread->javaVM->internalVMFunctions->walkBytecodeFrameSlots)
#endif
/* Use the JIT's view of the # of slots to get the argCount rather than asking
* the J9ROMMethod->argCount. This is essential as JSR 292 thunk_archetype methods
* serve only as templates for the generated code and will have an INCORRECT argCount
*/
#define SET_A0_CP_METHOD(walkState) \
(walkState)->arg0EA = (UDATA *) (((U_8 *) ((walkState)->bp + (walkState)->jitInfo->slots)) + sizeof(J9JITFrame) - sizeof(UDATA)), \
(walkState)->method = (walkState)->jitInfo->ramMethod, \
(walkState)->constantPool = (walkState)->jitInfo->constantPool, \
(walkState)->argCount = (walkState)->jitInfo->slots
#ifdef J9VM_JIT_FULL_SPEED_DEBUG
#define UPDATE_PC_FROM(walkState, pcExpression) \
(walkState)->pc = MASK_PC(*((walkState)->pcAddress = (U_8 **) &(pcExpression))), \
(walkState)->decompilationRecord = NULL
#else
#define UPDATE_PC_FROM(walkState, pcExpression) (walkState)->pc = MASK_PC((U_8 *) (pcExpression))
#define jitGetExceptionTable(walkState) jitGetExceptionTableFromPC((walkState)->walkThread, (UDATA) (walkState)->pc)
#endif
#ifdef J9VM_JIT_FULL_SPEED_DEBUG
#define COMMON_UNWIND_TO_NEXT_FRAME(walkState) \
(walkState)->resolveFrameFlags = 0, \
UPDATE_PC_FROM(walkState, ((J9JITFrame *) ((walkState)->bp))->returnPC)
#else
#define COMMON_UNWIND_TO_NEXT_FRAME(walkState) \
UPDATE_PC_FROM(walkState, ((J9JITFrame *) ((walkState)->bp))->returnPC)
#endif
#ifdef J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP
#define UNWIND_TO_NEXT_FRAME(walkState) \
(walkState)->unwindSP = ((UDATA *) (((J9JITFrame *) ((walkState)->bp)) + 1)) + (walkState)->argCount, \
COMMON_UNWIND_TO_NEXT_FRAME(walkState)
#else
#define UNWIND_TO_NEXT_FRAME(walkState) \
(walkState)->unwindSP = ((UDATA *) (((J9JITFrame *) ((walkState)->bp)) + 1)), /* arguments are passed in register, argument area lives in caller frame */ \
COMMON_UNWIND_TO_NEXT_FRAME(walkState)
#endif
#ifdef J9VM_INTERP_STACKWALK_TRACING
#define CLEAR_LOCAL_REGISTER_MAP_ENTRIES(walkState) \
{ \
UDATA clearRegNum; \
for (clearRegNum = 0; clearRegNum < (J9SW_POTENTIAL_SAVED_REGISTERS - J9SW_JIT_CALLEE_PRESERVED_SIZE); ++clearRegNum) { \
((UDATA **) &((walkState)->registerEAs))[jitCalleeDestroyedRegisterList[clearRegNum]] = NULL; \
} \
}
#else
#define CLEAR_LOCAL_REGISTER_MAP_ENTRIES(walkState)
#endif
#if (defined(J9VM_INTERP_STACKWALK_TRACING)) /* priv. proto (autogen) */
static void jitPrintFrameType(J9StackWalkState * walkState, char * frameType);
#endif /* J9VM_INTERP_STACKWALK_TRACING (autogen) */
static void walkJITFrameSlots(J9StackWalkState * walkState, U_8 * jitDescriptionBits, U_8 * stackAllocMapBits, U_8 ** jitDescriptionCursor, U_8 ** stackAllocMapCursor, UDATA * jitBitsRemaining, UDATA * mapBytesRemaining, UDATA * scanCursor, UDATA slotsRemaining, void *stackMap, J9JITStackAtlas *gcStackAtlas, char * slotDescription);
static void jitDropToCurrentFrame(J9StackWalkState * walkState);
static UDATA walkTransitionFrame(J9StackWalkState *walkState);
static void jitAddSpilledRegistersForJ2I(J9StackWalkState * walkState);
static void jitAddSpilledRegistersForINL(J9StackWalkState * walkState);
static UDATA jitNextUTFChar(U_8 ** pUtfData);
#if (defined(J9VM_JIT_FULL_SPEED_DEBUG)) /* priv. proto (autogen) */
static J9JITExceptionTable * jitGetExceptionTable(J9StackWalkState * walkState);
#endif /* J9VM_JIT_FULL_SPEED_DEBUG (autogen) */
static void jitAddSpilledRegistersForResolve(J9StackWalkState * walkState);
static void jitWalkFrame(J9StackWalkState *walkState, UDATA walkLocals, void *stackMap);
static void jitWalkResolveMethodFrame(J9StackWalkState *walkState);
static void jitWalkRegisterMap(J9StackWalkState *walkState, void *stackMap, J9JITStackAtlas *gcStackAtlas);
static UDATA jitNextSigChar(U_8 ** utfData);
static void jitWalkStackAllocatedObject(J9StackWalkState * walkState, j9object_t object);
static jvmtiIterationControl stackAllocatedObjectSlotWalkFunction(J9JavaVM *javaVM, J9MM_IterateObjectDescriptor *objectDesc, J9MM_IterateObjectRefDescriptor *refDesc, void *userData);
static UDATA countOwnedObjectMonitors(J9StackWalkState *walkState);
static UDATA walkLiveMonitorSlots(J9StackWalkState *walkState, J9JITStackAtlas *gcStackAtlas,
U_8 *liveMonitorMap, U_8 *monitorMask, U_16 numberOfMapBits);
static void countLiveMonitorSlots(J9StackWalkState *walkState, J9JITStackAtlas *gcStackAtlas, U_8 *liveMonitorMap, U_8 *monitorMask, U_16 numberOfMapBits);
static j9object_t *getSlotAddress(J9StackWalkState *walkState, J9JITStackAtlas *gcStackAtlas, U_16 slot);
static void jitWalkOSRBuffer(J9StackWalkState *walkState, J9OSRBuffer *osrBuffer);
UDATA jitWalkStackFrames(J9StackWalkState *walkState)
{
UDATA rc;
UDATA * returnSP;
U_8 * failedPC;
UDATA i;
U_8 ** returnTable;
void (*savedDropToCurrentFrame)(struct J9StackWalkState * walkState) ;
if (J9_ARE_ANY_BITS_SET(walkState->flags, J9_STACKWALK_RESUME)) {
walkState->flags &= ~J9_STACKWALK_RESUME;
if (0 != walkState->inlineDepth) {
goto resumeWalkInline;
}
goto resumeNonInline;
}
if (walkState->flags & J9_STACKWALK_MAINTAIN_REGISTER_MAP) {
memset(&walkState->registerEAs, 0, sizeof(walkState->registerEAs));
}
if ((rc = walkTransitionFrame(walkState)) != J9_STACKWALK_KEEP_ITERATING) {
return rc;
}
walkState->frameFlags = 0;
savedDropToCurrentFrame = walkState->dropToCurrentFrame;
walkState->dropToCurrentFrame = jitDropToCurrentFrame;
while ((walkState->jitInfo = jitGetExceptionTable(walkState)) != NULL) {
walkState->stackMap = NULL;
walkState->inlineMap = NULL;
walkState->bp = walkState->unwindSP + getJitTotalFrameSize(walkState->jitInfo);
#ifdef J9VM_INTERP_LINEAR_STACKWALK_TRACING
lswRecord(walkState, LSW_TYPE_JIT_BP, walkState->bp);
#endif
/* Point walkState->sp to the last outgoing argument */
#ifdef J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP
walkState->sp = walkState->unwindSP - walkState->argCount;
#else
walkState->sp = walkState->unwindSP;
#endif
walkState->outgoingArgCount = walkState->argCount;
if ((!(walkState->flags & J9_STACKWALK_SKIP_INLINES)) && getJitInlinedCallInfo(walkState->jitInfo)) {
jitGetMapsFromPC(walkState->walkThread->javaVM, walkState->jitInfo, (UDATA) walkState->pc, &(walkState->stackMap), &(walkState->inlineMap));
if (NULL != walkState->inlineMap) {
walkState->inlinedCallSite = getFirstInlinedCallSite(walkState->jitInfo, walkState->inlineMap);
if (NULL != walkState->inlinedCallSite) {
walkState->inlineDepth = getJitInlineDepthFromCallSite(walkState->jitInfo, walkState->inlinedCallSite);
walkState->arg0EA = NULL;
do {
J9Method * inlinedMethod = (J9Method *)getInlinedMethod(walkState->inlinedCallSite);
walkState->method = inlinedMethod;
walkState->constantPool = UNTAGGED_METHOD_CP(walkState->method);
walkState->bytecodePCOffset = (IDATA) getCurrentByteCodeIndexAndIsSameReceiver(walkState->jitInfo, walkState->inlineMap, walkState->inlinedCallSite, NULL);
#ifdef J9VM_INTERP_STACKWALK_TRACING
jitPrintFrameType(walkState, "JIT inline");
#endif
#ifdef J9VM_INTERP_LINEAR_STACKWALK_TRACING
lswFrameNew(walkState->walkThread->javaVM, walkState, LSW_FRAME_TYPE_JIT_INLINE);
lswRecord(walkState, LSW_TYPE_UNWIND_SP, walkState->unwindSP);
lswRecord(walkState, LSW_TYPE_METHOD, walkState->method);
lswRecord(walkState, LSW_TYPE_JIT_FRAME_INFO, walkState);
#endif
if ((rc = walkFrame(walkState)) != J9_STACKWALK_KEEP_ITERATING) {
return rc;
}
resumeWalkInline:
walkState->inlinedCallSite = getNextInlinedCallSite(walkState->jitInfo, walkState->inlinedCallSite);
} while(--walkState->inlineDepth != 0);
}
}
} else if (walkState->flags & J9_STACKWALK_RECORD_BYTECODE_PC_OFFSET) {
jitGetMapsFromPC(walkState->walkThread->javaVM, walkState->jitInfo, (UDATA) walkState->pc, &(walkState->stackMap), &(walkState->inlineMap));
}
SET_A0_CP_METHOD(walkState);
if (walkState->flags & J9_STACKWALK_RECORD_BYTECODE_PC_OFFSET) {
walkState->bytecodePCOffset = (NULL == walkState->inlineMap) ? (IDATA) -1 : (IDATA) getCurrentByteCodeIndexAndIsSameReceiver(walkState->jitInfo, walkState->inlineMap, NULL, NULL);
}
#ifdef J9VM_INTERP_LINEAR_STACKWALK_TRACING
lswFrameNew(walkState->walkThread->javaVM, walkState, LSW_FRAME_TYPE_JIT);
lswRecord(walkState, LSW_TYPE_UNWIND_SP, walkState->unwindSP);
lswRecord(walkState, LSW_TYPE_METHOD, walkState->method);
#endif
#ifdef J9VM_INTERP_STACKWALK_TRACING
jitPrintFrameType(walkState, "JIT");
#endif
if (walkState->flags & J9_STACKWALK_ITERATE_METHOD_CLASS_SLOTS) {
markClassesInInlineRanges(walkState->jitInfo, walkState);
}
if (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) {
jitWalkFrame(walkState, TRUE, walkState->stackMap);
}
#ifdef J9VM_INTERP_LINEAR_STACKWALK_TRACING
lswRecord(walkState, LSW_TYPE_JIT_FRAME_INFO, walkState);
#endif
if ((rc = walkFrame(walkState)) != J9_STACKWALK_KEEP_ITERATING) {
return rc;
}
resumeNonInline:
if (walkState->flags & J9_STACKWALK_MAINTAIN_REGISTER_MAP) {
CLEAR_LOCAL_REGISTER_MAP_ENTRIES(walkState);
jitAddSpilledRegisters(walkState, walkState->stackMap);
}
UNWIND_TO_NEXT_FRAME(walkState);
}
/* JIT pair with no mapping indicates a bytecoded frame */
failedPC = walkState->pc;
returnTable = (U_8 **) walkState->walkThread->javaVM->jitConfig->i2jReturnTable;
if (returnTable) {
for (i = 0; i < J9SW_JIT_RETURN_TABLE_SIZE; ++i) {
if (failedPC == returnTable[i]) {
goto i2jTransition;
}
}
/* Only report errors if the stack walk caller has allowed it.
* If errors are not being reported, the walk will continue at the last
* interpreter to JIT transition (skipping an unknown number of JIT frames.
* This is safe to do as the I2J values were saved by the interpreter at
* the transition point, and can be assumed to be valid.
*/
if (J9_ARE_NO_BITS_SET(walkState->flags, J9_STACKWALK_NO_ERROR_REPORT)) {
/* Avoid recursive error situations */
if (0 == (walkState->walkThread->privateFlags & J9_PRIVATE_FLAGS_STACK_CORRUPT)) {
walkState->walkThread->privateFlags |= J9_PRIVATE_FLAGS_STACK_CORRUPT;
walkState->walkThread->javaVM->internalVMFunctions->invalidJITReturnAddress(walkState);
}
}
i2jTransition: ;
}
UPDATE_PC_FROM(walkState, walkState->i2jState->pc);
walkState->literals = walkState->i2jState->literals;
walkState->arg0EA = (UDATA *) walkState->i2jState->a0;
returnSP = walkState->i2jState->returnSP;
walkState->previousFrameFlags = 0;
walkState->walkSP = (UDATA *) UNTAG2(returnSP, UDATA *);
#ifdef J9VM_INTERP_STACKWALK_TRACING
swPrintf(walkState, 2, "I2J values: PC = %p, A0 = %p, walkSP = %p, literals = %p, JIT PC = %p, pcAddress = %p, decomp = %p\n", walkState->pc,
walkState->arg0EA, walkState->walkSP, walkState->literals, failedPC,
#ifdef J9VM_JIT_FULL_SPEED_DEBUG
walkState->pcAddress, walkState->decompilationStack
#else
0, 0
#endif
);
#endif
walkState->dropToCurrentFrame = savedDropToCurrentFrame;
return J9_STACKWALK_KEEP_ITERATING;
}
static UDATA walkTransitionFrame(J9StackWalkState *walkState)
{
if (walkState->frameFlags & J9_STACK_FLAGS_JIT_RESOLVE_FRAME) {
J9SFJITResolveFrame * resolveFrame = (J9SFJITResolveFrame *) ((U_8 *) walkState->bp - sizeof(J9SFJITResolveFrame) + sizeof(UDATA));
UDATA resolveFrameType = walkState->frameFlags & J9_STACK_FLAGS_JIT_FRAME_SUB_TYPE_MASK;
#ifdef J9VM_INTERP_STACKWALK_TRACING
switch (resolveFrameType) {
case J9_STACK_FLAGS_JIT_GENERIC_RESOLVE: swPrintf(walkState, 3, "\tGeneric resolve\n"); break;
case J9_STACK_FLAGS_JIT_STACK_OVERFLOW_RESOLVE_FRAME: swPrintf(walkState, 3, "\tStack overflow resolve\n"); break;
case J9_STACK_FLAGS_JIT_DATA_RESOLVE: swPrintf(walkState, 3, "\tData resolve\n"); break;
case J9_STACK_FLAGS_JIT_RUNTIME_HELPER_RESOLVE: swPrintf(walkState, 3, "\tRuntime helper resolve\n"); break;
case J9_STACK_FLAGS_JIT_LOOKUP_RESOLVE: swPrintf(walkState, 3, "\tInterface lookup resolve\n"); break;
case J9_STACK_FLAGS_JIT_INTERFACE_METHOD_RESOLVE: swPrintf(walkState, 3, "\tInterface method resolve\n"); break;
case J9_STACK_FLAGS_JIT_SPECIAL_METHOD_RESOLVE: swPrintf(walkState, 3, "\tSpecial method resolve\n"); break;
case J9_STACK_FLAGS_JIT_STATIC_METHOD_RESOLVE: swPrintf(walkState, 3, "\tStatic method resolve\n"); break;
case J9_STACK_FLAGS_JIT_VIRTUAL_METHOD_RESOLVE: swPrintf(walkState, 3, "\tVirtual method resolve\n"); break;
case J9_STACK_FLAGS_JIT_RECOMPILATION_RESOLVE: swPrintf(walkState, 3, "\tRecompilation resolve\n"); break;
case J9_STACK_FLAGS_JIT_MONITOR_ENTER_RESOLVE: swPrintf(walkState, 3, "\tMonitor enter resolve\n"); break;
case J9_STACK_FLAGS_JIT_METHOD_MONITOR_ENTER_RESOLVE: swPrintf(walkState, 3, "\tMethod monitor enter resolve\n"); break;
case J9_STACK_FLAGS_JIT_FAILED_METHOD_MONITOR_ENTER_RESOLVE: swPrintf(walkState, 3, "\tFailed method monitor enter resolve\n"); break;
case J9_STACK_FLAGS_JIT_ALLOCATION_RESOLVE: swPrintf(walkState, 3, "\tAllocation resolve\n"); break;
case J9_STACK_FLAGS_JIT_BEFORE_ANEWARRAY_RESOLVE: swPrintf(walkState, 3, "\tBefore anewarray resolve\n"); break;
case J9_STACK_FLAGS_JIT_BEFORE_MULTIANEWARRAY_RESOLVE: swPrintf(walkState, 3, "\tBefore multianewarray resolve\n"); break;
case J9_STACK_FLAGS_JIT_INDUCE_OSR_RESOLVE: swPrintf(walkState, 3, "\tInduce OSR resolve\n"); break;
case J9_STACK_FLAGS_JIT_EXCEPTION_CATCH_RESOLVE: swPrintf(walkState, 3, "\tException catch resolve\n"); break;
default: swPrintf(walkState, 3, "\tUnknown resolve type %p\n", resolveFrameType);
}
#endif
UPDATE_PC_FROM(walkState, resolveFrame->returnAddress);
if (J9_STACK_FLAGS_JIT_EXCEPTION_CATCH_RESOLVE == resolveFrameType) {
#ifdef J9VM_INTERP_STACKWALK_TRACING
swPrintf(walkState, 3, "\tAt exception catch - incrementing PC to make map fetching work\n");
#endif
walkState->pc += 1;
}
walkState->resolveFrameFlags = walkState->frameFlags;
walkState->unwindSP = (UDATA *) UNTAG2(resolveFrame->taggedRegularReturnSP, UDATA *);
#ifdef J9VM_INTERP_STACKWALK_TRACING
swPrintf(walkState, 3, "\tunwindSP initialized to %p\n", walkState->unwindSP);
#endif
#ifdef J9SW_JIT_HELPERS_PASS_PARAMETERS_ON_STACK
walkState->unwindSP += resolveFrame->parmCount;
#ifdef J9VM_INTERP_STACKWALK_TRACING
swPrintf(walkState, 3, "\tAdding %d slots of pushed resolve parameters\n", resolveFrame->parmCount);
#endif
#endif
#ifdef J9VM_INTERP_LINEAR_STACKWALK_TRACING
lswRecord(walkState, LSW_TYPE_RESOLVE_FRAME_TYPE, (void*)resolveFrameType);
#endif
if (resolveFrameType == J9_STACK_FLAGS_JIT_DATA_RESOLVE) {
if (walkState->flags & J9_STACKWALK_MAINTAIN_REGISTER_MAP) {
jitAddSpilledRegistersForDataResolve(walkState);
}
walkState->unwindSP += getJitDataResolvePushes();
#ifdef J9VM_INTERP_STACKWALK_TRACING
swPrintf(walkState, 3, "\tData resolve added %d slots\n", getJitDataResolvePushes());
#endif
} else {
UDATA inMethodPrologue = TRUE;
if (walkState->flags & J9_STACKWALK_MAINTAIN_REGISTER_MAP) {
jitAddSpilledRegistersForResolve(walkState);
}
switch(resolveFrameType) {
case J9_STACK_FLAGS_JIT_VIRTUAL_METHOD_RESOLVE:
case J9_STACK_FLAGS_JIT_INTERFACE_METHOD_RESOLVE:
case J9_STACK_FLAGS_JIT_SPECIAL_METHOD_RESOLVE:
case J9_STACK_FLAGS_JIT_STATIC_METHOD_RESOLVE:
case J9_STACK_FLAGS_JIT_LOOKUP_RESOLVE:
case J9_STACK_FLAGS_JIT_RECOMPILATION_RESOLVE:
case J9_STACK_FLAGS_JIT_INDUCE_OSR_RESOLVE:
jitWalkResolveMethodFrame(walkState);
break;
case J9_STACK_FLAGS_JIT_FAILED_METHOD_MONITOR_ENTER_RESOLVE:
inMethodPrologue = FALSE;
/* Intentional fall-through */
case J9_STACK_FLAGS_JIT_STACK_OVERFLOW_RESOLVE_FRAME:
walkState->jitInfo = jitGetExceptionTable(walkState);
walkState->bp = walkState->unwindSP;
if (!inMethodPrologue) {
walkState->bp += getJitTotalFrameSize(walkState->jitInfo);
}
walkState->outgoingArgCount = 0;
SET_A0_CP_METHOD(walkState);
#ifdef J9VM_INTERP_STACKWALK_TRACING
jitPrintFrameType(walkState, "JIT (hidden)");
#endif
if (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) {
jitWalkFrame(walkState, !inMethodPrologue, NULL);
}
if (walkState->flags & J9_STACKWALK_ITERATE_HIDDEN_JIT_FRAMES) {
UDATA rc;
walkState->frameFlags = 0;
if ((rc = walkFrame(walkState)) != J9_STACKWALK_KEEP_ITERATING) {
return rc;
}
}
if (walkState->flags & J9_STACKWALK_MAINTAIN_REGISTER_MAP) {
CLEAR_LOCAL_REGISTER_MAP_ENTRIES(walkState);
}
UNWIND_TO_NEXT_FRAME(walkState);
}
}
} else if (walkState->frameFlags & J9_STACK_FLAGS_JIT_JNI_CALL_OUT_FRAME) {
J9SFNativeMethodFrame * nativeMethodFrame = (J9SFNativeMethodFrame *) ((U_8 *) walkState->bp - sizeof(J9SFNativeMethodFrame) + sizeof(UDATA));
UPDATE_PC_FROM(walkState, nativeMethodFrame->savedCP);
#ifdef J9VM_INTERP_GROWABLE_STACKS
if ((walkState->frameFlags & J9_SSF_JNI_REFS_REDIRECTED) && (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS)) {
UDATA * currentBP = walkState->bp;
walkState->jitInfo = jitGetExceptionTable(walkState);
walkState->unwindSP = ((UDATA *) nativeMethodFrame->savedPC) + 1;
walkState->bp = walkState->unwindSP + getJitTotalFrameSize(walkState->jitInfo);
SET_A0_CP_METHOD(walkState);
#ifdef J9VM_INTERP_STACKWALK_TRACING
jitPrintFrameType(walkState, "JIT (redirected JNI refs)");
#endif
jitWalkFrame(walkState, TRUE, NULL);
walkState->bp = currentBP;
}
#endif
walkState->unwindSP = walkState->bp + 1;
} else if (walkState->frameFlags & J9_STACK_FLAGS_JIT_CALL_IN_FRAME) {
UDATA callInFrameType = walkState->frameFlags & J9_STACK_FLAGS_JIT_FRAME_SUB_TYPE_MASK;
if ((callInFrameType & J9_STACK_FLAGS_JIT_CALL_IN_TYPE_J2_I) == J9_STACK_FLAGS_JIT_CALL_IN_TYPE_J2_I) {
J9SFJ2IFrame * j2iFrame = (J9SFJ2IFrame *) ((U_8 *) walkState->bp - sizeof(J9SFJ2IFrame) + sizeof(UDATA));
walkState->i2jState = &(j2iFrame->i2jState);
walkState->j2iFrame = j2iFrame->previousJ2iFrame;
if (walkState->flags & J9_STACKWALK_MAINTAIN_REGISTER_MAP) {
jitAddSpilledRegistersForJ2I(walkState);
}
walkState->unwindSP = (UDATA *) UNTAG2(j2iFrame->taggedReturnSP, UDATA *);
UPDATE_PC_FROM(walkState, j2iFrame->returnAddress);
} else {
if (J9_ARE_ANY_BITS_SET(walkState->flags, J9_STACKWALK_NO_ERROR_REPORT)) {
return J9_STACKWALK_STOP_ITERATING;
}
/* Choke & Die */
#ifndef J9VM_INTERP_STACKWALK_TRACING
/* Symbol not visible from verbose */
Assert_JSWalk_invalidFrameType();
#endif
}
} else { /* inl */
J9SFSpecialFrame * specialFrame = (J9SFSpecialFrame *) ((U_8 *) walkState->bp - sizeof(J9SFSpecialFrame) + sizeof(UDATA));
if (walkState->flags & J9_STACKWALK_MAINTAIN_REGISTER_MAP) {
jitAddSpilledRegistersForINL(walkState);
}
/* Do not add J9SW_JIT_STACK_SLOTS_USED_BY_CALL as it has been popped from the stack by the call to INL helper */
#ifdef J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP
walkState->unwindSP = walkState->arg0EA + 1;
#else
walkState->unwindSP = (UDATA *) UNTAG2(specialFrame->savedA0, UDATA *);
#endif
UPDATE_PC_FROM(walkState, specialFrame->savedCP);
}
return J9_STACKWALK_KEEP_ITERATING;
}
#if (defined(J9VM_INTERP_STACKWALK_TRACING)) /* priv. proto (autogen) */
static void jitPrintFrameType(J9StackWalkState * walkState, char * frameType)
{
swPrintf(walkState, 2, "%s frame: bp = %p, pc = %p, unwindSP = %p, cp = %p, arg0EA = %p, jitInfo = %p\n",
frameType, walkState->bp, walkState->pc, walkState->unwindSP,
walkState->constantPool, walkState->arg0EA, walkState->jitInfo);
swPrintMethod(walkState);
swPrintf(walkState, 3, "\tBytecode index = %d, inlineDepth = %d, PC offset = %p\n",
walkState->bytecodePCOffset, walkState->inlineDepth, walkState->pc - (U_8 *) walkState->method->extra);
}
#endif /* J9VM_INTERP_STACKWALK_TRACING (autogen) */
static void jitWalkFrame(J9StackWalkState *walkState, UDATA walkLocals, void *stackMap)
{
J9JITStackAtlas * gcStackAtlas;
U_8 * jitDescriptionCursor;
U_8 * stackAllocMapCursor;
UDATA * objectArgScanCursor;
UDATA * objectTempScanCursor;
UDATA jitBitsRemaining;
U_8 jitDescriptionBits = 0;
U_8 stackAllocMapBits = 0;
UDATA mapBytesRemaining;
U_8 variableInternalPtrSize;
UDATA registerMap;
J9JITDecompilationInfo *decompilationRecord;
WALK_METHOD_CLASS(walkState);
if (stackMap == NULL) {
stackMap = getStackMapFromJitPC(walkState->walkThread->javaVM, walkState->jitInfo, (UDATA) walkState->pc);
if (stackMap == NULL) {
if (J9_ARE_ANY_BITS_SET(walkState->flags, J9_STACKWALK_NO_ERROR_REPORT)) {
return;
}
PORT_ACCESS_FROM_WALKSTATE(walkState);
J9ROMMethod * romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(walkState->method);
J9UTF8 * className = J9ROMCLASS_CLASSNAME(J9_CLASS_FROM_METHOD(walkState->method)->romClass);
J9UTF8 * name = J9ROMMETHOD_NAME(romMethod);
J9UTF8 * sig = J9ROMMETHOD_SIGNATURE(romMethod);
j9nls_printf(PORTLIB, J9NLS_ERROR | J9NLS_BEGIN_MULTI_LINE, J9NLS_CODERT_UNABLE_TO_LOCATE_JIT_STACKMAP);
j9nls_printf(PORTLIB, J9NLS_ERROR | J9NLS_MULTI_LINE, J9NLS_CODERT_UNABLE_TO_LOCATE_JIT_STACKMAP_METHOD, (U_32) J9UTF8_LENGTH(className), J9UTF8_DATA(className), (U_32) J9UTF8_LENGTH(name), J9UTF8_DATA(name), (U_32) J9UTF8_LENGTH(sig), J9UTF8_DATA(sig), walkState->method);
j9nls_printf(PORTLIB, J9NLS_ERROR | J9NLS_END_MULTI_LINE, J9NLS_CODERT_UNABLE_TO_LOCATE_JIT_STACKMAP_PC, walkState->pc, walkState->pc - walkState->jitInfo->startPC, walkState->jitInfo);
#ifdef J9VM_INTERP_STACKWALK_TRACING
Assert_VRB_stackMapNull();
#else
Assert_Swalk_stackMapNull();
#endif
}
}
gcStackAtlas = (J9JITStackAtlas *) getJitGCStackAtlas(walkState->jitInfo);
#ifdef J9VM_INTERP_STACKWALK_TRACING
swPrintf(walkState, 2, "\tstackMap=%p, slots=%d parmBaseOffset=%d, parmSlots=%d, localBaseOffset=%d\n",
stackMap, walkState->jitInfo->slots, gcStackAtlas->parmBaseOffset, gcStackAtlas->numberOfParmSlots, gcStackAtlas->localBaseOffset);
#endif
objectArgScanCursor = getObjectArgScanCursor(walkState);
jitBitsRemaining = 0;
mapBytesRemaining = getJitNumberOfMapBytes(gcStackAtlas);
variableInternalPtrSize = 0;
registerMap = getJitRegisterMap(walkState->jitInfo, stackMap);
jitDescriptionCursor = getJitStackSlots(walkState->jitInfo, stackMap);
stackAllocMapCursor = getStackAllocMapFromJitPC(walkState->walkThread->javaVM, walkState->jitInfo, (UDATA) walkState->pc, stackMap);
walkState->slotType = J9_STACKWALK_SLOT_TYPE_METHOD_LOCAL;
walkState->slotIndex = 0;
if (getJitNumberOfParmSlots(gcStackAtlas)) {
#ifdef J9VM_INTERP_STACKWALK_TRACING
swPrintf(walkState, 4, "\tDescribed JIT args starting at %p for %d slots\n", objectArgScanCursor, gcStackAtlas->numberOfParmSlots);
#endif
walkJITFrameSlots(walkState, &jitDescriptionBits, &stackAllocMapBits, &jitDescriptionCursor, &stackAllocMapCursor, &jitBitsRemaining, &mapBytesRemaining,
objectArgScanCursor, getJitNumberOfParmSlots(gcStackAtlas), stackMap, NULL, ": a");
}
if (walkLocals) {
objectTempScanCursor = getObjectTempScanCursor(walkState);
if (walkState->bp - objectTempScanCursor) {
#ifdef J9VM_INTERP_STACKWALK_TRACING
swPrintf(walkState, 4, "\tDescribed JIT temps starting at %p for %d slots\n", objectTempScanCursor, walkState->bp - objectTempScanCursor);
#endif
walkJITFrameSlots(walkState, &jitDescriptionBits, &stackAllocMapBits, &jitDescriptionCursor, &stackAllocMapCursor, &jitBitsRemaining, &mapBytesRemaining,
objectTempScanCursor, walkState->bp - objectTempScanCursor, stackMap, gcStackAtlas, ": t");
}
}
jitWalkRegisterMap(walkState, stackMap, gcStackAtlas);
/* If there is an OSR buffer attached to this frame, walk it */
decompilationRecord = walkState->decompilationRecord;
if (NULL != decompilationRecord) {
J9OSRBuffer *osrBuffer = &decompilationRecord->osrBuffer;
if (0 != osrBuffer->numberOfFrames) {
jitWalkOSRBuffer(walkState, osrBuffer);
}
}
}
static void walkJITFrameSlots(J9StackWalkState * walkState, U_8 * jitDescriptionBits, U_8 * stackAllocMapBits, U_8 ** jitDescriptionCursor, U_8 ** stackAllocMapCursor, UDATA * jitBitsRemaining, UDATA * mapBytesRemaining, UDATA * scanCursor, UDATA slotsRemaining, void *stackMap, J9JITStackAtlas *gcStackAtlas, char * slotDescription)
{
#ifdef J9VM_INTERP_STACKWALK_TRACING
char indexedTag[64];
#endif
/* GC stack atlas passed in to this function is NULL when this method
is called for parameters in the frame; when this method is called for
autos in the frame, the actual stack atlas is passed in. This
works because no internal pointers/pinning arrays can be parameters.
We must avoid doing internal pointer fixup twice for a
given stack frame as this method is called twice for each
stack frame (once for parms and once for autos).
If internal pointer map exists in the atlas it means there are internal pointer
regs/autos in this method.
*/
if (gcStackAtlas && getJitInternalPointerMap(gcStackAtlas))
{
walkJITFrameSlotsForInternalPointers(walkState, jitDescriptionCursor, scanCursor, stackMap, gcStackAtlas);
}
while (slotsRemaining)
{
if (!*jitBitsRemaining)
{
if (*mapBytesRemaining)
{
*jitDescriptionBits = getNextDescriptionBit(jitDescriptionCursor);
if (*stackAllocMapCursor != NULL)
{
*stackAllocMapBits = getNextDescriptionBit(stackAllocMapCursor);
}
--*mapBytesRemaining;
}
else
{
*jitDescriptionBits = 0;
}
*jitBitsRemaining = 8;
}
if (*jitDescriptionBits & 1)
{
#ifdef J9VM_INTERP_STACKWALK_TRACING
PORT_ACCESS_FROM_WALKSTATE(walkState);
j9str_printf(PORTLIB, indexedTag, 64, "O-Slot: %s%d", slotDescription, slotsRemaining - 1);
WALK_NAMED_O_SLOT((j9object_t*) scanCursor, indexedTag);
#else
WALK_O_SLOT((j9object_t*) scanCursor);
#endif
}
else if (*stackAllocMapBits & 1)
{
jitWalkStackAllocatedObject(walkState, (j9object_t)scanCursor);
}
else
{
#ifdef J9VM_INTERP_STACKWALK_TRACING
PORT_ACCESS_FROM_WALKSTATE(walkState);
j9str_printf(PORTLIB, indexedTag, 64, "I-Slot: %s%d", slotDescription, slotsRemaining - 1);
WALK_NAMED_I_SLOT(scanCursor, indexedTag);
#else
WALK_I_SLOT(scanCursor);
#endif
if (walkState->flags & J9_STACKWALK_CHECK_I_SLOTS_FOR_OBJECTS) {
/* check for verbose output */
#ifdef J9VM_INTERP_STACKWALK_TRACING
if (walkState->userData1 == (void*) 8) {
swPrintf(walkState, 3, "SCANNING I SLOT 0x%x contains: 0x%x, object is in heap 0x%x (0 is heap pointer) \n", scanCursor, *scanCursor, walkState->walkThread->javaVM->memoryManagerFunctions->j9gc_ext_check_is_valid_heap_object(walkState->walkThread->javaVM, *(j9object_t *)scanCursor, 0));
}
#endif
if (walkState->walkThread->javaVM->memoryManagerFunctions->j9gc_ext_check_is_valid_heap_object(walkState->walkThread->javaVM, *(j9object_t *)scanCursor, 0) == 0 ) {
#ifdef J9VM_INTERP_STACKWALK_TRACING
if ((walkState->userData1 == (void*)1) || (walkState->userData1 == (void*)8) ) {
swPrintf(walkState, 3, "Possible Class Address: 0x%x at search PC 0x%x \n",*((j9object_t *)(*scanCursor)), walkState->pc );
}
if ((walkState->userData1 == (void*)1) || (walkState->userData1 == (void*)8) ) {
swPrintf(walkState, 3, "Uncollected ref SLOT 0x%x pointing at object ref 0x%x for stackmap at seachPC 0x%x: \n", scanCursor, *scanCursor, walkState->pc);
}
#endif
if (walkState->userData2 == (void*)4) {
walkState->walkThread->javaVM->memoryManagerFunctions->j9gc_modron_global_collect(walkState->currentThread);
} else {
walkState->walkThread->javaVM->memoryManagerFunctions->j9gc_modron_local_collect(walkState->currentThread);
walkState->walkThread->javaVM->memoryManagerFunctions->j9gc_modron_local_collect(walkState->currentThread);
}
}
}
}
++(walkState->slotIndex);
++scanCursor;
--*jitBitsRemaining;
*jitDescriptionBits >>= 1;
*stackAllocMapBits >>= 1;
--slotsRemaining;
}
}
static void jitWalkRegisterMap(J9StackWalkState *walkState, void *stackMap, J9JITStackAtlas *gcStackAtlas)
{
UDATA registerMap = getJitRegisterMap(walkState->jitInfo, stackMap) & J9SW_REGISTER_MAP_MASK;
#ifdef J9VM_INTERP_STACKWALK_TRACING
swPrintf(walkState, 3, "\tJIT-RegisterMap = %p\n", registerMap);
#endif
if (gcStackAtlas->internalPointerMap) {
registerMap &= ~INTERNAL_PTR_REG_MASK;
}
if (registerMap) {
UDATA count = J9SW_POTENTIAL_SAVED_REGISTERS;
UDATA ** mapCursor;
#ifdef J9SW_REGISTER_MAP_WALK_REGISTERS_LOW_TO_HIGH
mapCursor = (UDATA **) &(walkState->registerEAs);
#else
mapCursor = ((UDATA **) &(walkState->registerEAs)) + J9SW_POTENTIAL_SAVED_REGISTERS - 1;
#endif
walkState->slotType = J9_STACKWALK_SLOT_TYPE_JIT_REGISTER_MAP;
walkState->slotIndex = 0;
while (count) {
if (registerMap & 1) {
j9object_t * targetObject = *((j9object_t **) mapCursor);
#ifdef J9VM_INTERP_STACKWALK_TRACING
j9object_t oldObject = *targetObject;
j9object_t newObject;
swPrintf(walkState, 4, "\t\tJIT-RegisterMap-O-Slot[%p] = %p (%s)\n", targetObject, oldObject, jitRegisterNames[mapCursor - ((UDATA **) &(walkState->registerEAs))]);
#endif
walkState->objectSlotWalkFunction(walkState->walkThread, walkState, targetObject, targetObject);
#ifdef J9VM_INTERP_STACKWALK_TRACING
newObject = *targetObject;
if (oldObject != newObject) {
swPrintf(walkState, 4, "\t\t\t-> %p\n", newObject);
}
#ifdef J9VM_INTERP_LINEAR_STACKWALK_TRACING
lswRecordSlot(walkState, targetObject, LSW_TYPE_O_SLOT, "O-Slot");
#endif
#endif
}
#ifdef J9VM_INTERP_STACKWALK_TRACING
else {
UDATA * targetSlot = *((UDATA **) mapCursor);
if (targetSlot) {
swPrintf(walkState, 5, "\t\tJIT-RegisterMap-I-Slot[%p] = %p (%s)\n", targetSlot, *targetSlot, jitRegisterNames[mapCursor - ((UDATA **) &(walkState->registerEAs))]);
#ifdef J9VM_INTERP_LINEAR_STACKWALK_TRACING
lswRecordSlot(walkState, targetSlot, LSW_TYPE_I_SLOT, "I-Slot");
#endif
}
}
#endif
++(walkState->slotIndex);
--count;
registerMap >>= 1;
#ifdef J9SW_REGISTER_MAP_WALK_REGISTERS_LOW_TO_HIGH
++mapCursor;
#else
--mapCursor;
#endif
}
}
}
#ifdef J9SW_JIT_FLOAT_ARGUMENT_REGISTER_COUNT
#if defined(J9VM_ARCH_S390)
/* On 390, either vector or floating point registers are preserved in the ELS, not both.
* Matching VRs and FPRs overlap, with the FPR contents in the high-order bits of the VR,
* meaning that when the VR is saved to memory, the FPR contents are in the lowest-memory
* address of the VR save memory (due to 390 being big endian).
*
* Similarly, float values loaded using the LE instruction occupy the high-order bits of
* the target FPR, meaning that the float contents are also in the lowest-memory address
* of the save memory, whether it be VR or FPR.
*
* Currently, the 32 128-bit save slots for JIT VRs appear directly after the 16 64-bit
* save slots for JIT FPRs, so if vector registers are enabled, the save location for a
* JIT FPR is (base + (16 * 64) + (128 * FPRNumber)), or (base + (64 * (16 + (2 * FPRNumber)))).
*/
#define JIT_FPR_PARM_ADDRESS(walkState, fpParmNumber) \
(((U_64*)((walkState)->walkedEntryLocalStorage->jitFPRegisterStorageBase)) + \
(J9_ARE_ANY_BITS_SET((walkState)->walkThread->javaVM->extendedRuntimeFlags, J9_EXTENDED_RUNTIME_USE_VECTOR_REGISTERS) \
? 16 + (2 * jitFloatArgumentRegisterNumbers[fpParmNumber]) \
: jitFloatArgumentRegisterNumbers[fpParmNumber]) \
)
#else
#define JIT_FPR_PARM_ADDRESS(walkState, fpParmNumber) (((U_64*)((walkState)->walkedEntryLocalStorage->jitFPRegisterStorageBase)) + jitFloatArgumentRegisterNumbers[fpParmNumber])
#endif
static void
jitWalkResolveMethodFrame_walkD(J9StackWalkState *walkState, UDATA ** pendingSendScanCursor, UDATA * floatRegistersRemaining)
{
/* Doubles always occupy two stack slots. Move the pendingSendScanCursor back to the
* beginning of the two slots.
*/
--(*pendingSendScanCursor);
if (*floatRegistersRemaining) {
UDATA fpParmNumber = J9SW_JIT_FLOAT_ARGUMENT_REGISTER_COUNT - *floatRegistersRemaining;
#ifdef J9VM_INTERP_STACKWALK_TRACING
if (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) {
#if !defined(J9VM_ENV_DATA64)
WALK_NAMED_I_SLOT(((UDATA*)JIT_FPR_PARM_ADDRESS(walkState, fpParmNumber)) + 1, "JIT-sig-reg-I-Slot");
#endif
WALK_NAMED_I_SLOT((UDATA*)JIT_FPR_PARM_ADDRESS(walkState, fpParmNumber), "JIT-sig-reg-I-Slot");
}
#endif
if (walkState->flags & J9_STACKWALK_SAVE_STACKED_REGISTERS) {
*(U_64*)*pendingSendScanCursor = *JIT_FPR_PARM_ADDRESS(walkState, fpParmNumber);
}
--(*floatRegistersRemaining);
}
#ifdef J9VM_INTERP_STACKWALK_TRACING
else {
if (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) {
#if !defined(J9VM_ENV_DATA64)
WALK_NAMED_I_SLOT((*pendingSendScanCursor) + 1, "JIT-sig-stk-I-Slot");
#endif
WALK_NAMED_I_SLOT(*pendingSendScanCursor, "JIT-sig-stk-I-Slot");
}
}
#endif
}
static void
jitWalkResolveMethodFrame_walkF(J9StackWalkState *walkState, UDATA ** pendingSendScanCursor, UDATA * floatRegistersRemaining)
{
if (*floatRegistersRemaining) {
UDATA fpParmNumber = J9SW_JIT_FLOAT_ARGUMENT_REGISTER_COUNT - *floatRegistersRemaining;
#ifdef J9VM_INTERP_STACKWALK_TRACING
if (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) {
#if defined(J9SW_JIT_FLOATS_PASSED_AS_DOUBLES) && !defined(J9VM_ENV_DATA64)
WALK_NAMED_I_SLOT(((UDATA*)JIT_FPR_PARM_ADDRESS(walkState, fpParmNumber)) + 1, "JIT-sig-reg-I-Slot");
#endif
WALK_NAMED_I_SLOT((UDATA*)JIT_FPR_PARM_ADDRESS(walkState, fpParmNumber), "JIT-sig-reg-I-Slot");
}
#endif
if (walkState->flags & J9_STACKWALK_SAVE_STACKED_REGISTERS) {
#if defined(J9SW_JIT_FLOATS_PASSED_AS_DOUBLES)
jitConvertStoredDoubleRegisterToSingle(JIT_FPR_PARM_ADDRESS(walkState, fpParmNumber),(U_32*)*pendingSendScanCursor);
#else
*(U_32*)*pendingSendScanCursor = *(U_32*)JIT_FPR_PARM_ADDRESS(walkState, fpParmNumber);
#endif
}
--(*floatRegistersRemaining);
}
#ifdef J9VM_INTERP_STACKWALK_TRACING
else {
if (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) {
WALK_NAMED_I_SLOT(*pendingSendScanCursor, "JIT-sig-stk-I-Slot");
}
}
#endif
}
#endif
static void
jitWalkResolveMethodFrame_walkJ(J9StackWalkState *walkState, UDATA ** pendingSendScanCursor, UDATA ** stackSpillCursor, UDATA * stackSpillCount)
{
/* Longs always take 2 stack slots */
--(*pendingSendScanCursor);
#if defined(J9SW_ARGUMENT_REGISTER_COUNT)
if (*stackSpillCount) {
/* On 64-bit, the long is in a single register.
*
* On 32-bit, parameter registers are used for longs such that the lower-numbered register
* holds the lower-memory half of the long (so that a store multiple on the register pair
* could be used to put the long back in memory). This remains true for the case where only
* one parameter register remains.
*/
#ifdef J9VM_INTERP_STACKWALK_TRACING
if (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) {
WALK_NAMED_I_SLOT(*stackSpillCursor, "JIT-sig-reg-I-Slot");
}
#endif
if (walkState->flags & J9_STACKWALK_SAVE_STACKED_REGISTERS) {
**pendingSendScanCursor = **stackSpillCursor;
}
--(*stackSpillCount);
--(*stackSpillCursor);
#if !defined(J9VM_ENV_DATA64)
if (*stackSpillCount) {
#ifdef J9VM_INTERP_STACKWALK_TRACING
if (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) {
WALK_NAMED_I_SLOT(*stackSpillCursor, "JIT-sig-reg-I-Slot");
}
#endif
if (walkState->flags & J9_STACKWALK_SAVE_STACKED_REGISTERS) {
*((*pendingSendScanCursor) + 1) = **stackSpillCursor;
}
--(*stackSpillCount);
--(*stackSpillCursor);
} else
#endif
{
#ifdef J9VM_INTERP_STACKWALK_TRACING
if (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) {
WALK_NAMED_I_SLOT((*pendingSendScanCursor) + 1, "JIT-sig-stk-I-Slot");
}
#endif
}
} else
#endif
{
#ifdef J9VM_INTERP_STACKWALK_TRACING
if (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) {
/* Long is entirely in memory */
WALK_NAMED_I_SLOT((*pendingSendScanCursor) + 1, "JIT-sig-stk-I-Slot");
WALK_NAMED_I_SLOT(*pendingSendScanCursor, "JIT-sig-stk-I-Slot");
}
#endif
}
}
static void
jitWalkResolveMethodFrame_walkI(J9StackWalkState *walkState, UDATA ** pendingSendScanCursor, UDATA ** stackSpillCursor,
UDATA * stackSpillCount)
{
#ifdef J9SW_ARGUMENT_REGISTER_COUNT
if (*stackSpillCount) {
if (walkState->flags & J9_STACKWALK_SAVE_STACKED_REGISTERS) {
*(U_32*)*pendingSendScanCursor = (U_32)**stackSpillCursor;
}
#ifdef J9VM_INTERP_STACKWALK_TRACING
if (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) {
WALK_NAMED_I_SLOT(*stackSpillCursor, "JIT-sig-reg-I-Slot");
}
#endif
--(*stackSpillCount);
--(*stackSpillCursor);
} else
#endif
{
#ifdef J9VM_INTERP_STACKWALK_TRACING
if (walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) {
WALK_NAMED_I_SLOT(*pendingSendScanCursor, "JIT-sig-stk-I-Slot");
}
#endif
}
}
static void jitWalkResolveMethodFrame(J9StackWalkState *walkState)
{
UDATA walkStackedReceiver = FALSE;
J9UTF8 * signature;
UDATA pendingSendSlots;
U_8 * sigData;
UDATA sigChar;
#ifdef J9SW_ARGUMENT_REGISTER_COUNT
UDATA * stackSpillCursor = NULL;
UDATA stackSpillCount = 0;
#endif
#ifdef J9SW_JIT_FLOAT_ARGUMENT_REGISTER_COUNT
UDATA floatRegistersRemaining = J9SW_JIT_FLOAT_ARGUMENT_REGISTER_COUNT;
#endif
UDATA resolveFrameType = walkState->frameFlags & J9_STACK_FLAGS_JIT_FRAME_SUB_TYPE_MASK;
walkState->slotType = J9_STACKWALK_SLOT_TYPE_INTERNAL;
walkState->slotIndex = -1;
if (resolveFrameType == J9_STACK_FLAGS_JIT_RECOMPILATION_RESOLVE) {
J9Method * method = (J9Method *) JIT_RESOLVE_PARM(1);
J9ROMMethod * romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(method);
signature = J9ROMMETHOD_SIGNATURE(romMethod);
pendingSendSlots = J9_ARG_COUNT_FROM_ROM_METHOD(romMethod); /* receiver is already included in this arg count */
walkStackedReceiver = ((romMethod->modifiers & J9AccStatic) == 0);
#ifdef J9SW_ARGUMENT_REGISTER_COUNT
stackSpillCount = J9SW_ARGUMENT_REGISTER_COUNT;
walkState->unwindSP += J9SW_ARGUMENT_REGISTER_COUNT;
stackSpillCursor = walkState->unwindSP - 1;
#endif
walkState->unwindSP += getJitRecompilationResolvePushes();
} else if (resolveFrameType == J9_STACK_FLAGS_JIT_LOOKUP_RESOLVE) {
UDATA *interfaceObjectAndISlot = (UDATA *) JIT_RESOLVE_PARM(2);
J9Class *resolvedClass = (J9Class *) *interfaceObjectAndISlot;
UDATA iTableOffset = *(interfaceObjectAndISlot + 1);
J9Method *ramMethod = NULL;
J9ROMMethod *romMethod = NULL;
if (J9_ARE_ANY_BITS_SET(iTableOffset, J9_ITABLE_OFFSET_DIRECT)) {
ramMethod = (J9Method*)(iTableOffset & ~J9_ITABLE_OFFSET_TAG_BITS);
} else if (J9_ARE_ANY_BITS_SET(iTableOffset, J9_ITABLE_OFFSET_VIRTUAL)) {
UDATA vTableOffset = iTableOffset & ~J9_ITABLE_OFFSET_TAG_BITS;
J9Class *jlObject = J9VMJAVALANGOBJECT_OR_NULL(walkState->walkThread->javaVM);
ramMethod = *(J9Method**)((UDATA)jlObject + vTableOffset);
} else {