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BytecodeInterpreter.hpp
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BytecodeInterpreter.hpp
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/*******************************************************************************
* Copyright IBM Corp. and others 1991
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] https://openjdk.org/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
*******************************************************************************/
#if !defined(BYTECODEINTERPRETER_HPP_)
#define BYTECODEINTERPRETER_HPP_
#if JAVA_SPEC_VERSION >= 21
#include <errno.h>
#if defined(WIN32)
/* Ignore the definition of UDATA as it is defined in <windows.h>. */
#define UDATA UDATA_win32_
#include <windows.h>
#undef UDATA /* This is safe because our UDATA is a typedef rather than a macro. */
#include <winsock2.h>
#endif /* defined(WIN32) */
#endif /* JAVA_SPEC_VERSION >= 21 */
#include "bcnames.h"
#define FFI_BUILDING /* Needed on Windows to link libffi statically */
#include "ffi.h"
#include "j2sever.h"
#include "j9.h"
#include "j9bcvnls.h"
#include "j9cfg.h"
#include "j9consts.h"
#include "j9jclnls.h"
#include "j9protos.h"
#include "j9vmnls.h"
#include "jitregmap.h"
#include "jni.h"
#include "jvminit.h"
#include "objhelp.h"
#include "rommeth.h"
#include "stackwalk.h"
#include "ut_j9vm.h"
#include "util_api.h"
#include "vm_internal.h"
#include "vmaccess.h"
#include "ArrayCopyHelpers.hpp"
#include "AtomicSupport.hpp"
#include "BytecodeAction.hpp"
#if defined(J9VM_OPT_CRIU_SUPPORT)
#include "CRIUHelpers.hpp"
#endif /* defined(J9VM_OPT_CRIU_SUPPORT) */
#if defined(J9VM_OPT_METHOD_HANDLE)
#include "MHInterpreter.hpp"
#endif /* defined(J9VM_OPT_METHOD_HANDLE) */
#include "ObjectAccessBarrierAPI.hpp"
#include "ObjectHash.hpp"
#include "ValueTypeHelpers.hpp"
#include "VMHelpers.hpp"
#include "VMAccess.hpp"
#include "ObjectAllocationAPI.hpp"
#include "OutOfLineINL.hpp"
#include "UnsafeAPI.hpp"
#include "ObjectMonitor.hpp"
#include "JITInterface.hpp"
#if JAVA_SPEC_VERSION >= 16
#include "LayoutFFITypeHelpers.hpp"
#endif /* JAVA_SPEC_VERSION >= 16 */
#if 0
#define DEBUG_MUST_HAVE_VM_ACCESS(vmThread) Assert_VM_mustHaveVMAccess(vmThread)
#else
#define DEBUG_MUST_HAVE_VM_ACCESS(vmThread)
#endif
#define DO_INTERPRETER_PROFILING
#if defined(DEBUG_VERSION)
#define DO_HOOKS
#define DO_SINGLE_STEP
#endif /* DEBUG_VERSION */
typedef enum {
VM_NO,
VM_YES,
VM_MAYBE
} VM_YesNoMaybe;
#define LOCAL_PC
#define LOCAL_SP
#if defined(LOCAL_CURRENT_THREAD)
#define CURRENT_THREAD J9VMThread * &_currentThread
#define CURRENT_THREAD_PARAM _currentThread
#endif
#if defined(LOCAL_ARG0EA)
#define ARG0EA UDATA * &_arg0EA
#define ARG0EA_PARAM _arg0EA
#endif
#if defined(LOCAL_SP)
#define SP UDATA * &_sp
#define SP_PARAM _sp
#endif
#if defined(LOCAL_PC)
#define PC U_8 * &_pc
#define PC_PARAM _pc
#endif
#if defined(LOCAL_LITERALS)
#define LITERALS J9Method * &_literals
#define LITERALS_PARAM _literals
#endif
#define REGISTER_ARGS_LIST SP, PC
#define REGISTER_ARGS SP_PARAM, PC_PARAM
#if defined(DEBUG_VERSION)
#define DEBUG_UPDATE_VMSTRUCT() updateVMStruct(REGISTER_ARGS)
#else
#define DEBUG_UPDATE_VMSTRUCT()
#endif
#if defined(J9VM_PORT_ZOS_CEEHDLRSUPPORT)
extern "C" {
extern void CEEJNIWrapper(J9VMThread *currentThread);
}
#endif /* J9VM_PORT_ZOS_CEEHDLRSUPPORT */
#if JAVA_SPEC_VERSION >= 16
extern "C" {
extern void
#if FFI_NATIVE_RAW_API
ffiCallWithSetJmpForUpcall(J9VMThread *currentThread, ffi_cif *cif, void *function, UDATA *returnStorage, void **values, ffi_raw *values_raw);
#else /* FFI_NATIVE_RAW_API */
ffiCallWithSetJmpForUpcall(J9VMThread *currentThread, ffi_cif *cif, void *function, UDATA *returnStorage, void **values);
#endif /* FFI_NATIVE_RAW_API */
}
#endif /* JAVA_SPEC_VERSION >= 16 */
class INTERPRETER_CLASS
{
/*
* Data members
*/
private:
J9JavaVM * const _vm;
#if !defined(LOCAL_CURRENT_THREAD)
J9VMThread * const _currentThread;
#endif
#if !defined(LOCAL_ARG0EA)
UDATA *_arg0EA;
#endif
#if !defined(LOCAL_SP)
UDATA *_sp;
#endif
#if !defined(LOCAL_PC)
U_8 *_pc;
#endif
#if !defined(LOCAL_LITERALS)
J9Method *_literals;
#endif
UDATA _nextAction;
J9Method *_sendMethod;
#if defined(DO_SINGLE_STEP)
bool _skipSingleStep;
#endif
MM_ObjectAllocationAPI _objectAllocate;
MM_ObjectAccessBarrierAPI _objectAccessBarrier;
protected:
public:
/*
* Function members
*/
private:
VMINLINE bool
interpreterReentryRequested()
{
#if defined(J9VM_OPT_CRIU_SUPPORT)
return VM_VMHelpers::interpreterReentryRequested(_currentThread);
#else /* J9VM_OPT_CRIU_SUPPORT */
return false;
#endif /* J9VM_OPT_CRIU_SUPPORT */
}
VMINLINE VM_BytecodeAction
reenterInterpreter(UDATA reentryAction)
{
_currentThread->returnValue = reentryAction;
_nextAction = J9_BCLOOP_REENTER_INTERPRETER;
return GOTO_DONE;
}
#if defined(J9VM_OPT_METHOD_HANDLE)
/**
* Run a methodHandle using the MethodHandle interpreter/
* @param methodHandle[in] The MethodHandle to run
* @return the next action to take.
*/
VMINLINE VM_BytecodeAction
interpretMethodHandle(REGISTER_ARGS_LIST, j9object_t methodHandle)
{
updateVMStruct(REGISTER_ARGS);
VM_MHInterpreter mhInterpreter(_currentThread, &_objectAllocate, &_objectAccessBarrier);
VM_BytecodeAction next = mhInterpreter.dispatchLoop(methodHandle);
VMStructHasBeenUpdated(REGISTER_ARGS);
return next;
}
/**
* Modify the MH.invocationCount so that invocations from the interpreter don't
* actually modify the counts or affect CustomThunk compilation.
* Shareable thunk compilation is based on the ThunkTuple counting.
* Shareable thunks then modify the MH.invocationCount on each invocation. We
* only want invocations from jitted code to drive CustomThunk compilation so the
* interpreter needs to preemptively negate the modification to the invocationCount.
*
* @param methodHandle[in] The MethodHandle to modify the count on
*/
VMINLINE void
modifyMethodHandleCountForI2J(REGISTER_ARGS_LIST, j9object_t methodHandle)
{
/* Decrement the MH.invocationCount as the shareableThunks increment it. We only want
* invocations from compiled code to be counted.
*/
I_32 count = J9VMJAVALANGINVOKEMETHODHANDLE_INVOCATIONCOUNT(_currentThread, methodHandle);
J9VMJAVALANGINVOKEMETHODHANDLE_SET_INVOCATIONCOUNT(_currentThread, methodHandle, count - 1);
}
#endif /* defined(J9VM_OPT_METHOD_HANDLE) */
#if defined(DO_SINGLE_STEP)
void VMINLINE
skipNextSingleStep()
{
if (J9_EVENT_IS_HOOKED(_vm->hookInterface, J9HOOK_VM_SINGLE_STEP)) {
_skipSingleStep = true;
}
}
VM_BytecodeAction VMINLINE
singleStep(REGISTER_ARGS_LIST)
{
VM_BytecodeAction rc = FALL_THROUGH;
if (J9_EVENT_IS_HOOKED(_vm->hookInterface, J9HOOK_VM_SINGLE_STEP)) {
if (_skipSingleStep) {
_skipSingleStep = false;
} else {
updateVMStruct(REGISTER_ARGS);
ALWAYS_TRIGGER_J9HOOK_VM_SINGLE_STEP(_vm->hookInterface, _currentThread, _literals, _pc - _literals->bytecodes);
VMStructHasBeenUpdated(REGISTER_ARGS);
if (JBbreakpoint == *_pc) {
rc = GOTO_EXECUTE_BREAKPOINTED_BYTECODE;
} else if (immediateAsyncPending()) {
rc = GOTO_ASYNC_CHECK;
}
}
}
return rc;
}
#endif
/* Profiling records:
*
* J9ProfilingBytecodeRecord
* U_8* _pc;
* J9ProfilingBytecodeBranchRecord
* U_8 taken;
* J9ProfilingBytecodeCastRecord
* J9Class *instanceClass;
* J9ProfilingBytecodeSwitchRecord
* U_32 index;
* J9ProfilingBytecodeMethodEnterExitRecord (_pc == 0 for enter, 1 for exit, 2 for exit due to throw)
* J9Method *method;
* J9ProfilingBytecodeInvokeRecord
* J9Class *receiverClass;
* J9Method *callingMethod;
* J9Method *targetMethod;
* J9ProfilingBytecodeCallingMethodRecord
* J9Method *callingMethod;
*/
VMINLINE U_8*
startProfilingRecord(REGISTER_ARGS_LIST, UDATA dataSize)
{
#if defined(DO_INTERPRETER_PROFILING)
retry:
U_8 *profilingCursor = NULL;
if (J9_EVENT_IS_HOOKED(_vm->hookInterface, J9HOOK_VM_PROFILING_BYTECODE_BUFFER_FULL)) {
IDATA count = (IDATA)(UDATA)_literals->extra;
if ((count > 0) && (count <= (IDATA)_currentThread->maxProfilingCount)) {
#if defined(DEBUG_VERSION)
/* Do not profile breakpointed methods because the pc points to memory
* which will go away when the breakpoint is removed.
*/
if (!methodIsBreakpointed(_literals))
#endif /* DEBUG_VERSION */
{
U_8 *nextRecord = _currentThread->profilingBufferCursor;
profilingCursor = nextRecord;
nextRecord += (sizeof(U_8*) + dataSize);
if (nextRecord >= _currentThread->profilingBufferEnd) {
updateVMStruct(REGISTER_ARGS);
flushBytecodeProfilingData(_currentThread);
goto retry;
} else {
_currentThread->profilingBufferCursor = nextRecord;
*(U_8**)profilingCursor = _pc;
profilingCursor += sizeof(U_8*);
}
}
}
}
return profilingCursor;
#else
return NULL;
#endif
}
VMINLINE void
profileCallingMethod(REGISTER_ARGS_LIST)
{
U_8 *profilingCursor = startProfilingRecord(REGISTER_ARGS, sizeof(J9Method*));
if (NULL != profilingCursor) {
*(J9Method**)profilingCursor = _literals;
}
}
VMINLINE void
profileInvokeReceiver(REGISTER_ARGS_LIST, J9Class *clazz, J9Method *callingMethod, J9Method *targetMethod)
{
U_8 *profilingCursor = startProfilingRecord(REGISTER_ARGS, sizeof(J9Class*) + 2*sizeof(J9Method*));
if (NULL != profilingCursor) {
#if defined(J9VM_ARCH_ARM) && !defined(J9VM_ENV_DATA64)
/* ARMv8 does not support store multiple to unaligned addresses, and unfortunately GCC
* generates a store multiple for the normal version of these three assignments.
* To avoid the store multiple instructions, we can replace the assignments with
* inline assembly code.
*/
asm (
"str %[clazz], [%[cursor], #0]\n\t"
"str %[method], [%[cursor], #4]\n\t"
"str %[target], [%[cursor], #8]\n\t"
: // No outputs
:[cursor] "r" (profilingCursor),
[clazz] "r" (clazz),
[method] "r" (callingMethod),
[target] "r" (targetMethod)
);
#else /* defined(J9VM_ARCH_ARM) && !defined(J9VM_ENV_DATA64) */
*(J9Class**)profilingCursor = clazz;
profilingCursor += sizeof(J9Class*);
*(J9Method**)profilingCursor = callingMethod;
profilingCursor += sizeof(J9Method*);
*(J9Method**)profilingCursor = targetMethod;
#endif /* defined(J9VM_ARCH_ARM) && !defined(J9VM_ENV_DATA64) */
}
}
VMINLINE void
profileCast(REGISTER_ARGS_LIST, J9Class *clazz)
{
U_8 *profilingCursor = startProfilingRecord(REGISTER_ARGS, sizeof(J9Class*));
if (NULL != profilingCursor) {
*(J9Class**)profilingCursor = clazz;
}
}
VMINLINE void
profileSwitch(REGISTER_ARGS_LIST, I_32 index)
{
U_8 *profilingCursor = startProfilingRecord(REGISTER_ARGS, sizeof(I_32));
if (NULL != profilingCursor) {
*(I_32*)profilingCursor = index;
}
}
VMINLINE void
updateVMStruct(REGISTER_ARGS_LIST)
{
J9VMThread *const thread = _currentThread;
thread->arg0EA = _arg0EA;
thread->sp = _sp;
thread->pc = _pc;
thread->literals = _literals;
}
VMINLINE void
VMStructHasBeenUpdated(REGISTER_ARGS_LIST)
{
J9VMThread const *const thread = _currentThread;
_arg0EA = thread->arg0EA;
_sp = thread->sp;
_pc = thread->pc;
_literals = thread->literals;
}
VMINLINE UDATA*
buildSpecialStackFrame(REGISTER_ARGS_LIST, UDATA type, UDATA flags, bool visible)
{
*--_sp = (UDATA)_arg0EA | (visible ? 0 : J9SF_A0_INVISIBLE_TAG);
UDATA *bp = _sp;
*--_sp = (UDATA)_pc;
*--_sp = (UDATA)_literals;
*--_sp = (flags);
_pc = (U_8*)(type);
_literals = NULL;
return bp;
}
VMINLINE void
buildGenericSpecialStackFrame(REGISTER_ARGS_LIST, UDATA flags)
{
_arg0EA = buildSpecialStackFrame(REGISTER_ARGS, J9SF_FRAME_TYPE_GENERIC_SPECIAL, flags, false);
}
VMINLINE UDATA*
buildMethodFrame(REGISTER_ARGS_LIST, J9Method *method, UDATA flags)
{
UDATA *bp = buildSpecialStackFrame(REGISTER_ARGS, J9SF_FRAME_TYPE_METHOD, flags, false);
*--_sp = (UDATA)method;
_arg0EA = bp + J9_ROM_METHOD_FROM_RAM_METHOD(method)->argCount;
return bp;
}
VMINLINE UDATA
jitStackFrameFlags(REGISTER_ARGS_LIST, UDATA constantFlags)
{
UDATA flags = _currentThread->jitStackFrameFlags;
_currentThread->jitStackFrameFlags = 0;
return flags | constantFlags;
}
VMINLINE void
restoreGenericSpecialStackFrame(REGISTER_ARGS_LIST)
{
_sp = _arg0EA + 1;
_literals = (J9Method*)(_sp[-3]);
_pc = (U_8*)(_sp[-2]);
_arg0EA = (UDATA*)(_sp[-1] & ~(UDATA)J9SF_A0_INVISIBLE_TAG);
}
VMINLINE void
restoreSpecialStackFrameLeavingArgs(REGISTER_ARGS_LIST, UDATA *bp)
{
_sp = bp + 1;
_literals = (J9Method*)(bp[-2]);
_pc = (U_8*)(bp[-1]);
_arg0EA = (UDATA*)(bp[0] & ~(UDATA)J9SF_A0_INVISIBLE_TAG);
}
VMINLINE void
restoreSpecialStackFrameAndDrop(REGISTER_ARGS_LIST, UDATA *bp)
{
_sp = _arg0EA + 1;
_literals = (J9Method*)(bp[-2]);
_pc = (U_8*)(bp[-1]);
_arg0EA = (UDATA*)(bp[0] & ~(UDATA)J9SF_A0_INVISIBLE_TAG);
}
VMINLINE UDATA*
buildInternalNativeStackFrame(REGISTER_ARGS_LIST)
{
UDATA *bp = buildSpecialStackFrame(REGISTER_ARGS, J9SF_FRAME_TYPE_NATIVE_METHOD, jitStackFrameFlags(REGISTER_ARGS, 0), true);
*--_sp = (UDATA)_sendMethod;
_arg0EA = bp + J9_ROM_METHOD_FROM_RAM_METHOD(_sendMethod)->argCount;
return bp;
}
VMINLINE void
buildJITResolveFrame(REGISTER_ARGS_LIST)
{
updateVMStruct(REGISTER_ARGS);
VM_VMHelpers::buildJITResolveFrameWithPC(_currentThread, J9_SSF_JIT_RESOLVE, _currentThread->tempSlot, 0, _literals);
VMStructHasBeenUpdated(REGISTER_ARGS);
}
VMINLINE void
restoreInternalNativeStackFrame(REGISTER_ARGS_LIST)
{
J9SFNativeMethodFrame *nativeMethodFrame = (J9SFNativeMethodFrame*)_sp;
restoreSpecialStackFrameLeavingArgs(REGISTER_ARGS, ((UDATA*)(nativeMethodFrame + 1)) - 1);
}
VMINLINE J9SFJNINativeMethodFrame*
recordJNIReturn(REGISTER_ARGS_LIST, UDATA *bp)
{
J9SFJNINativeMethodFrame *frame = ((J9SFJNINativeMethodFrame*)(bp + 1)) - 1;
UDATA flags = frame->specialFrameFlags;
if (flags & J9_SSF_JNI_REFS_REDIRECTED) {
freeStacks(_currentThread, bp);
}
if (flags & J9_SSF_CALL_OUT_FRAME_ALLOC) {
jniPopFrame(_currentThread, JNIFRAME_TYPE_INTERNAL);
}
return frame;
}
/**
* Unwind a J9SFMethodTypeFrame from the stack.
*
* @param frame[in] A pointer to the J9SFMethodTypeFrame
* @param spPriorToFrameBuild[in] The stack pointer prior to building the frame.
*/
VMINLINE void
restoreMethodTypeFrame(REGISTER_ARGS_LIST, J9SFMethodTypeFrame *frame, UDATA *spPriorToFrameBuild)
{
_literals = frame->savedCP;
_pc = frame->savedPC;
_arg0EA = UNTAGGED_A0(frame);
_sp = spPriorToFrameBuild;
}
VMINLINE UDATA*
bpForCurrentBytecodedMethod(REGISTER_ARGS_LIST)
{
J9ROMMethod *romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(_literals);
UDATA localCount = romMethod->argCount + romMethod->tempCount;
if (romMethod->modifiers & J9AccSynchronized) {
localCount += 1;
}
if (J9ROMMETHOD_IS_NON_EMPTY_OBJECT_CONSTRUCTOR(romMethod)) {
localCount += 1;
}
return _arg0EA - localCount;
}
VMINLINE void
pushObjectInSpecialFrame(REGISTER_ARGS_LIST, j9object_t object)
{
_sp -= 1;
_literals = (J9Method*)((UDATA)_literals + sizeof(object));
*(j9object_t*)_sp = object;
}
VMINLINE j9object_t
popObjectInSpecialFrame(REGISTER_ARGS_LIST)
{
j9object_t object = *(j9object_t*)_sp;
_sp += 1;
_literals = (J9Method*)((UDATA)_literals - sizeof(object));
return object;
}
VMINLINE VM_BytecodeAction
i2jTransition(REGISTER_ARGS_LIST)
{
VM_BytecodeAction rc = RUN_METHOD_INTERPRETED;
J9ROMMethod *romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(_sendMethod);
void* const jitStartAddress = _sendMethod->extra;
if (startAddressIsCompiled((UDATA)jitStartAddress)) {
/* If we are single stepping, or about to run a breakpointed method, fall back to the interpreter.
* Check FSD enabled first, to minimize the number of extra instructions in the normal execution path
* and because the breakpoint bit is re-used by Z/OS as the offload bit for native methods. Natives are
* not currently compiled when FSD is enabled - if they ever are, a check will need to be added here.
*/
J9JITConfig *jitConfig = _vm->jitConfig;
if (jitConfig->fsdEnabled) {
if (!methodCanBeRunCompiled(_sendMethod)) {
goto done;
}
}
/* If we got here straight from JIT, jump directly to the method - do not follow the interpreter path */
if (0 != _currentThread->jitStackFrameFlags) {
rc = promotedMethodOnTransitionFromJIT(REGISTER_ARGS, (void*)_literals, jitStartAddress);
goto done;
}
/* Run the compiled code */
rc = jitTransition(REGISTER_ARGS, romMethod->argCount, jitStartAddress);
}
done:
return rc;
}
VMINLINE VM_BytecodeAction
i2jMHTransition(REGISTER_ARGS_LIST)
{
#if defined(J9VM_OPT_METHOD_HANDLE)
/* VMThread->tempSlot will hold the MethodHandle.
* VMThread->floatTemp1 will hold the compiledEntryPoint
*/
void* const jitStartAddress = _currentThread->floatTemp1;
j9object_t methodHandle = (j9object_t)_currentThread->tempSlot;
j9object_t methodType = J9VMJAVALANGINVOKEMETHODHANDLE_TYPE(_currentThread, methodHandle);
/* Currently FSD should be disabling compilation of MethodHandles */
J9JITConfig *jitConfig = _vm->jitConfig;
Assert_VM_false(jitConfig->fsdEnabled);
/* Add one to MethodType->argSlots to account for the MethodHandle receiver */
return jitTransition(REGISTER_ARGS, J9VMJAVALANGINVOKEMETHODTYPE_ARGSLOTS(_currentThread, methodType) + 1, jitStartAddress);
#else /* defined(J9VM_OPT_METHOD_HANDLE) */
Assert_VM_unreachable();
return EXECUTE_BYTECODE;
#endif /* defined(J9VM_OPT_METHOD_HANDLE) */
}
VMINLINE VM_BytecodeAction
j2iTransition(
REGISTER_ARGS_LIST
#if defined(J9VM_OPT_OPENJDK_METHODHANDLE)
, bool immediatelyRunCompiledMethod = false
#endif /* defined(J9VM_OPT_OPENJDK_METHODHANDLE) */
) {
VM_JITInterface::disableRuntimeInstrumentation(_currentThread);
VM_BytecodeAction rc = GOTO_RUN_METHOD;
void* const jitReturnAddress = VM_JITInterface::fetchJITReturnAddress(_currentThread, _sp);
J9ROMMethod* const romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(_sendMethod);
void* const exitPoint = j2iReturnPoint(J9ROMMETHOD_SIGNATURE(romMethod));
if (J9_ARE_ANY_BITS_SET(romMethod->modifiers, J9AccNative | J9AccAbstract)) {
_literals = (J9Method*)jitReturnAddress;
_pc = nativeReturnBytecodePC(REGISTER_ARGS, romMethod);
#if defined(J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP)
/* Variable frame */
_arg0EA = NULL;
#else /* J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP */
/* Fixed frame - remember the SP so it can be reset upon return from the native */
_arg0EA = _sp;
#endif /* J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP */
/* Set the flag indicating that the caller was the JIT */
_currentThread->jitStackFrameFlags = J9_SSF_JIT_NATIVE_TRANSITION_FRAME;
/* If a stop request has been posted, handle it instead of running the native */
if (J9_ARE_ANY_BITS_SET(_currentThread->publicFlags, J9_PUBLIC_FLAGS_STOP)) {
buildMethodFrame(REGISTER_ARGS, _sendMethod, jitStackFrameFlags(REGISTER_ARGS, 0));
_currentThread->currentException = _currentThread->stopThrowable;
_currentThread->stopThrowable = NULL;
VM_VMAccess::clearPublicFlagsNoMutex(_currentThread, J9_PUBLIC_FLAGS_STOP);
omrthread_clear_priority_interrupted();
rc = GOTO_THROW_CURRENT_EXCEPTION;
}
} else {
bool decompileOccurred = false;
_pc = (U_8*)jitReturnAddress;
UDATA preCount = 0;
UDATA postCount = 0;
UDATA result = 0;
do {
preCount = (UDATA)_sendMethod->extra;
if (J9_ARE_NO_BITS_SET(preCount, J9_STARTPC_NOT_TRANSLATED)) {
#if defined(J9VM_OPT_OPENJDK_METHODHANDLE)
if (immediatelyRunCompiledMethod) {
if (methodCanBeRunCompiled(_sendMethod)) {
rc = promotedMethodOnTransitionFromJIT(REGISTER_ARGS, (void*)_pc, (void*)preCount);
goto done;
}
}
#endif /* defined(J9VM_OPT_OPENJDK_METHODHANDLE) */
break;
}
if ((IDATA)preCount < 0) {
/* This method should not be translated (already enqueued, already failed, etc) */
break;
}
postCount = preCount - _currentThread->jitCountDelta;
if ((IDATA)postCount < 0) {
/* Attempt to compile the method */
_arg0EA = _sp;
_literals = (J9Method*)_pc;
UDATA *bp = buildMethodFrame(REGISTER_ARGS, _sendMethod, J9_SSF_JIT_NATIVE_TRANSITION_FRAME);
updateVMStruct(REGISTER_ARGS);
/* this call cannot change bp as no java code is run */
UDATA oldState = VM_VMHelpers::setVMState(_currentThread, J9VMSTATE_JIT);
J9JITConfig *jitConfig = _vm->jitConfig;
jitConfig->entryPoint(jitConfig, _currentThread, _sendMethod, 0);
VM_VMHelpers::setVMState(_currentThread, oldState);
VMStructHasBeenUpdated(REGISTER_ARGS);
restoreSpecialStackFrameLeavingArgs(REGISTER_ARGS, bp);
if (MASK_PC(_pc) != MASK_PC(_literals)) {
decompileOccurred = true;
_pc = (U_8*)_literals;
}
/* If the method is now compiled, run it compiled, otherwise run it bytecoded */
UDATA const jitStartAddress = (UDATA)_sendMethod->extra;
if (startAddressIsCompiled(jitStartAddress)) {
if (methodCanBeRunCompiled(_sendMethod)) {
if (decompileOccurred) {
/* The return address is not currently on the stack. It will be pushed into the
* next stack slot.
*/
_currentThread->decompilationStack->pcAddress = (U_8**)(_sp - 1);
}
rc = promotedMethodOnTransitionFromJIT(REGISTER_ARGS, (void*)_pc, (void*)jitStartAddress);
goto done;
}
}
break;
}
result = VM_AtomicSupport::lockCompareExchange((UDATA*)&_sendMethod->extra, preCount, postCount);
/* If count updates, run method interpreted, else loop around and try again */
} while (result != preCount);
/* Run the method interpreted */
{
UDATA stackUse = VM_VMHelpers::calculateStackUse(romMethod, sizeof(J9SFJ2IFrame));
UDATA *checkSP = _sp - stackUse;
if ((checkSP > _sp) || VM_VMHelpers::shouldGrowForSP(_currentThread, checkSP)) {
checkSP -= (sizeof(J9SFMethodFrame) / sizeof(UDATA));
UDATA currentUsed = (UDATA)_currentThread->stackObject->end - (UDATA)checkSP;
UDATA maxStackSize = _vm->stackSize;
_arg0EA = _sp;
_literals = (J9Method*)_pc;
buildMethodFrame(REGISTER_ARGS, _sendMethod, J9_SSF_JIT_NATIVE_TRANSITION_FRAME);
updateVMStruct(REGISTER_ARGS);
if (currentUsed > maxStackSize) {
throwStackOverflow:
if (J9_ARE_ANY_BITS_SET(_currentThread->privateFlags, J9_PRIVATE_FLAGS_STACK_OVERFLOW)) {
// vmStruct already up-to-date in all paths to here
fatalRecursiveStackOverflow(_currentThread);
}
setCurrentExceptionUTF(_currentThread, J9VMCONSTANTPOOL_JAVALANGSTACKOVERFLOWERROR, NULL);
VMStructHasBeenUpdated(REGISTER_ARGS);
rc = GOTO_THROW_CURRENT_EXCEPTION;
goto done;
}
currentUsed += _vm->stackSizeIncrement;
if (currentUsed > maxStackSize) {
currentUsed = maxStackSize;
}
if (0 != growJavaStack(_currentThread, currentUsed)) {
goto throwStackOverflow;
}
VMStructHasBeenUpdated(REGISTER_ARGS);
UDATA *bp = ((UDATA*)(((J9SFMethodFrame*)_sp) + 1)) - 1;
restoreSpecialStackFrameLeavingArgs(REGISTER_ARGS, bp);
if (MASK_PC(_pc) != MASK_PC(_literals)) {
decompileOccurred = true;
_pc = (U_8*)_literals;
}
}
}
#if defined(J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP)
/* Variable frame - return SP should pop the arguments */
_arg0EA = _sp + romMethod->argCount;
#else /* J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP */
/* Fixed frame - remember the SP so it can be reset upon return to the JIT */
_arg0EA = _sp;
#endif /* J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP */
_literals = (J9Method*)exitPoint;
rc = inlineSendTarget(REGISTER_ARGS, VM_MAYBE, VM_MAYBE, VM_MAYBE, VM_MAYBE, true, decompileOccurred);
}
done:
return rc;
}
VMINLINE VM_BytecodeAction
promotedMethodOnTransitionFromJIT(REGISTER_ARGS_LIST, void *returnAddress, void *jumpAddress)
{
VM_JITInterface::restoreJITReturnAddress(_currentThread, _sp, returnAddress);
_currentThread->tempSlot = (UDATA)jumpAddress;
_nextAction = J9_BCLOOP_LOAD_PRESERVED_AND_BRANCH;
VM_JITInterface::enableRuntimeInstrumentation(_currentThread);
return GOTO_DONE;
}
VMINLINE J9Method*
j2iVirtualMethod(REGISTER_ARGS_LIST, j9object_t receiver, UDATA interfaceVTableIndex)
{
J9Method *method = NULL;
void* const jitReturnAddress = VM_JITInterface::peekJITReturnAddress(_currentThread, _sp);
UDATA jitVTableOffset = VM_JITInterface::jitVTableIndex(jitReturnAddress, interfaceVTableIndex);
if (J9_ARE_ANY_BITS_SET(jitVTableOffset, J9_VTABLE_INDEX_DIRECT_METHOD_FLAG)) {
/* Nestmates: vtable index is really a J9Method to directly invoke */
method = (J9Method*)(jitVTableOffset & ~J9_VTABLE_INDEX_DIRECT_METHOD_FLAG);
} else {
UDATA vTableOffset = sizeof(J9Class) - jitVTableOffset;
J9Class *clazz = J9OBJECT_CLAZZ(_currentThread, receiver);
method = *(J9Method**)((UDATA)clazz + vTableOffset);
}
return method;
}
VMINLINE void
restorePreservedRegistersFromWalkState(REGISTER_ARGS_LIST, J9StackWalkState *walkState)
{
J9VMEntryLocalStorage* const els = _currentThread->entryLocalStorage;
UDATA* const jitGlobalStorageBase = els->jitGlobalStorageBase;
UDATA* const * const preservedBase = (UDATA**)&walkState->registerEAs;
for (UDATA i = 0; i < J9SW_JIT_CALLEE_PRESERVED_SIZE; ++i) {
U_8 const registerNumber = jitCalleeSavedRegisterList[i];
jitGlobalStorageBase[registerNumber] = *(preservedBase[registerNumber]);
}
}
VMINLINE VM_BytecodeAction
retFromNativeHelper(REGISTER_ARGS_LIST, UDATA slots, void *jitReturn)
{
memmove(&_currentThread->returnValue, _sp, slots * sizeof(UDATA));
#if defined(J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP)
/* Variable frame - drop the return value */
_sp += slots;
#else /* J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP */
/* Fixed frame - reset sp to it's value when the call occurred */
_sp = _arg0EA;
#endif /* J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP */
_currentThread->floatTemp1 = (void*)_literals;
_currentThread->tempSlot = (UDATA)jitReturn;
_nextAction = J9_BCLOOP_LOAD_PRESERVED_AND_BRANCH;
return GOTO_DONE;
}
VMINLINE VM_BytecodeAction
fillOSRBuffer(REGISTER_ARGS_LIST, void *osrBlock)
{
_sp = (UDATA*)_currentThread->osrJittedFrameCopy;
_currentThread->osrReturnAddress = _vm->jitConfig->jitFillOSRBufferReturn;
_currentThread->tempSlot = (UDATA)osrBlock;
_nextAction = J9_BCLOOP_LOAD_PRESERVED_AND_BRANCH;
return GOTO_DONE;
}
VMINLINE VM_BytecodeAction
returnFromJIT(REGISTER_ARGS_LIST, UDATA slotCount, bool isConstructor)
{
VM_JITInterface::disableRuntimeInstrumentation(_currentThread);
if (isConstructor) {
VM_AtomicSupport::writeBarrier();
}
J9I2JState *i2jState = &_currentThread->entryLocalStorage->i2jState;
_sp = UNTAG2(i2jState->returnSP, UDATA*) - slotCount;
_arg0EA = i2jState->a0;
_literals= i2jState->literals;
_pc = i2jState->pc + 3;
memmove(_sp, &_currentThread->floatTemp1, sizeof(UDATA) * slotCount);
#if defined(TRACE_TRANSITIONS)
char currentMethodName[1024];
PORT_ACCESS_FROM_JAVAVM(_vm);
getMethodName(PORTLIB, _literals, _pc, currentMethodName);
switch(slotCount) {
case 0:
j9tty_printf(PORTLIB, "<%p> enter: J9_BCLOOP_RETURN_FROM_JIT %s %s\n", _currentThread, currentMethodName, isConstructor ? "ctor" : "void");
break;
case 1:
j9tty_printf(PORTLIB, "<%p> enter: J9_BCLOOP_RETURN_FROM_JIT %s value=0x%zx\n", _currentThread, currentMethodName, *_sp);
break;
case 2:
j9tty_printf(PORTLIB, "<%p> enter: J9_BCLOOP_RETURN_FROM_JIT %s value=0x%llx\n", _currentThread, currentMethodName, *(U_64*)_sp);
break;
default:
Assert_VM_unreachable();
}
#endif /* TRACE_TRANSITIONS */
return EXECUTE_BYTECODE;
}
VMINLINE VM_BytecodeAction
jitTransition(REGISTER_ARGS_LIST, UDATA argCount, void *jitStartAddress)
{
UDATA returnSP = ((UDATA)(_sp + argCount)) | J9_STACK_FLAGS_J2_IFRAME;
/* Align the java stack such that sp is double-slot aligned upon entry to the JIT code */
if (J9_ARE_ANY_BITS_SET((UDATA)_sp, sizeof(UDATA))) {
_sp -= 1;
memmove(_sp, _sp + 1, sizeof(UDATA) * argCount);
}
J9I2JState *i2jState = &_currentThread->entryLocalStorage->i2jState;
i2jState->returnSP = (UDATA*)returnSP;
i2jState->a0 = _arg0EA;
i2jState->literals = _literals;
i2jState->pc = _pc;
U_32 returnTypeIndex = ((U_32*)jitStartAddress)[-1] & 0xF;
void *returnPoint = ((void**)_vm->jitConfig->i2jReturnTable)[returnTypeIndex];
// TODO: not loading receiver for I2J
// TODO: not loading pseudoTOC
return promotedMethodOnTransitionFromJIT(REGISTER_ARGS, returnPoint, jitStartAddress);
}
VMINLINE void*
j2iReturnPoint(J9UTF8 *signature)
{
J9JITConfig* const jitConfig = _vm->jitConfig;
void *returnPoint = jitConfig->jitExitInterpreter1;
U_16 length = J9UTF8_LENGTH(signature);
U_8 *data = J9UTF8_DATA(signature);
U_8 sigChar = data[length - 1];
if ('[' == data[length - 2]) {
goto obj;
}
switch(sigChar) {
case 'V':
returnPoint = jitConfig->jitExitInterpreter0;
break;
case ';':
obj:
/* On 32-bit, object uses the "1" target (already loaded, so just break).
* On 64-bit, object uses the "J" target (fall through)
*/
#if !defined(J9VM_ENV_DATA64)
break;
#endif /* !J9VM_ENV_DATA64 */
case 'J':
returnPoint = jitConfig->jitExitInterpreterJ;
break;
case 'F':
returnPoint = jitConfig->jitExitInterpreterF;
break;
case 'D':
returnPoint = jitConfig->jitExitInterpreterD;
break;
}
return returnPoint;
}
VMINLINE void*
j2iReturnPoint(J9Class *returnType)
{
J9JITConfig* const jitConfig = _vm->jitConfig;
void *returnPoint = jitConfig->jitExitInterpreter1;
J9ROMClass* const romClass = returnType->romClass;
if (J9ROMCLASS_IS_PRIMITIVE_TYPE(romClass)) {
if (returnType == _vm->voidReflectClass) {
returnPoint = jitConfig->jitExitInterpreter0;
} else if (returnType == _vm->longReflectClass) {
returnPoint = jitConfig->jitExitInterpreterJ;
} else if (returnType == _vm->floatReflectClass) {
returnPoint = jitConfig->jitExitInterpreterF;
} else if (returnType == _vm->doubleReflectClass) {
returnPoint = jitConfig->jitExitInterpreterD;
}
} else {
/* On 32-bit, object uses the "1" target (already loaded).
* On 64-bit, object uses the "J" target
*/
#if defined(J9VM_ENV_DATA64)
returnPoint = jitConfig->jitExitInterpreterJ;
#endif /* !J9VM_ENV_DATA64 */
}
return returnPoint;
}
VMINLINE void
fillInJ2IValues(J9SFJ2IFrame* const j2iFrame, void* const exitPoint, void* const jitReturnAddress, UDATA *returnSP)
{
J9VMEntryLocalStorage* const els = _currentThread->entryLocalStorage;
UDATA* const jitGlobalStorageBase = els->jitGlobalStorageBase;
UDATA* const j2iPreservedBase = ((UDATA*)&j2iFrame->previousJ2iFrame) + 1;
j2iFrame->i2jState = els->i2jState;
j2iFrame->previousJ2iFrame = _currentThread->j2iFrame;
for (UDATA i = 0; i < J9SW_JIT_CALLEE_PRESERVED_SIZE; ++i) {
j2iPreservedBase[i] = jitGlobalStorageBase[jitCalleeSavedRegisterList[i]];
}
j2iFrame->specialFrameFlags = J9_SSF_JIT_CALLIN;
j2iFrame->exitPoint = exitPoint;
j2iFrame->returnAddress = (U_8*)jitReturnAddress;
j2iFrame->taggedReturnSP = returnSP;
_currentThread->j2iFrame = (UDATA*)&j2iFrame->taggedReturnSP;
}
VMINLINE void
restoreJ2IValues(J9SFJ2IFrame* const j2iFrame)
{
J9VMEntryLocalStorage* const els = _currentThread->entryLocalStorage;
UDATA* const jitGlobalStorageBase = els->jitGlobalStorageBase;
UDATA* const j2iPreservedBase = ((UDATA*)&j2iFrame->previousJ2iFrame) + 1;
els->i2jState = j2iFrame->i2jState;
_currentThread->j2iFrame = j2iFrame->previousJ2iFrame;
for (UDATA i = 0; i < J9SW_JIT_CALLEE_PRESERVED_SIZE; ++i) {
jitGlobalStorageBase[jitCalleeSavedRegisterList[i]] = j2iPreservedBase[i];
}
}
VMINLINE VM_BytecodeAction
j2iReturn(REGISTER_ARGS_LIST)
{
memmove(&_currentThread->returnValue, _sp, sizeof(U_64));
J9SFJ2IFrame* const j2iFrame = ((J9SFJ2IFrame*)(_currentThread->j2iFrame + 1)) - 1;
restoreJ2IValues(j2iFrame);
_sp = UNTAG2(j2iFrame->taggedReturnSP, UDATA*);
_currentThread->floatTemp1 = (void*)j2iFrame->returnAddress;
_currentThread->tempSlot = (UDATA)j2iFrame->exitPoint;
_nextAction = J9_BCLOOP_LOAD_PRESERVED_AND_BRANCH;
return GOTO_DONE;
}
VMINLINE U_8*
nativeReturnBytecodePC(REGISTER_ARGS_LIST, J9ROMMethod* const romMethod)
{
static const U_8 returnFromNativeBytecodes[][4] = {
{ JBinvokestatic, 0, 0, JBretFromNative0 }, /* void */
{ JBinvokestatic, 0, 0, JBretFromNative1 }, /* boolean */
{ JBinvokestatic, 0, 0, JBretFromNative1 }, /* byte */
{ JBinvokestatic, 0, 0, JBretFromNative1 }, /* char */
{ JBinvokestatic, 0, 0, JBretFromNative1 }, /* short */
{ JBinvokestatic, 0, 0, JBretFromNativeF }, /* float */
{ JBinvokestatic, 0, 0, JBretFromNative1 }, /* int */
{ JBinvokestatic, 0, 0, JBretFromNativeD }, /* double */
{ JBinvokestatic, 0, 0, JBretFromNativeJ }, /* long */
#if defined(J9VM_ENV_DATA64)
{ JBinvokestatic, 0, 0, JBretFromNativeJ }, /* object */